Submersible mud pump

Product overview

WQ (QW) submersible mud pump is a new generation of pumps developed on the basis of the introduction of foreign advanced technology and the use characteristics of domestic pumps. It has the characteristics of high efficiency, energy saving, unique structure, anti winding, non blocking, automatic installation and automatic control. It has a unique effect in discharging solid particles and long fiber waste. It is applicable to chemical, petroleum, pharmaceutical, mining, paper industry, cement plant, steel plant, power plant, coal processing industry, as well as the sewage and dirties of conveying belt particles in the drainage system of urban sewage treatment plant, municipal engineering, construction site and other industries. It is also used for pumping clean water and corrosive medium.

WQ (QW) submersible mud pump

WQ (QW) submersible mud pump adopts a unique impeller structure and a new type of mechanical seal, which can effectively transport solids and long fibers. Compared with the traditional impeller, the impeller of the pump adopts the form of single channel or double channel, which is similar to a bend with the same cross-section size, and has very good over flow performance. With a reasonable volute chamber, the pump has high efficiency, the impeller has dynamic and static balance test, and the pump has no vibration in operation.

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How to understand vacuum unit and vacuum system

Vacuum unit is composed of vacuum pump, various pipelines, integrated sensors, vacuum meters, measuring devices, electrical control systems and a series of supporting vacuum auxiliary equipment. It is named according to the type of main pump. The vacuum application range is divided into low vacuum unit, medium vacuum pump unit, high vacuum unit and ultra-high vacuum unit.
1) The low vacuum unit generally adopts the direct exhaust type vacuum pump, such as the positive displacement reciprocating pump, water ring pump, oil seal mechanical pump, screw vacuum pump, wet roots pump, jet pump, molecular sieve adsorption pump, etc. the low vacuum unit has high working pressure and large exhaust volume, and is mainly used for vacuum transmission, vacuum impregnation, vacuum filtration, vacuum degassing of vacuum dryer, etc.
2) Medium vacuum unit is mainly composed of Roots vacuum pump + oil seal mechanical pump, roots vacuum + water ring vacuum pump and double roots vacuum pump. With the wide use of screw oil-free vacuum pump, oil-free vacuum units such as roots vacuum pump + screw vacuum pump are gradually increasing, which are suitable for various vacuum systems requiring large pumping speed and obtaining medium vacuum, such as coating machine, vacuum smelting, vacuum heat treatment, medicine and chemical industry, electric welding and other industries.
3) The high vacuum unit works in the molecular flow state, with the working pressure range of 10-2 ~ 10-6pa, small displacement and large pumping speed. The main pump is mainly composed of diffusion pump, molecular pump and titanium sublimation pump. If the low-temperature condensate pump can not work directly in the atmosphere, it needs to be equipped with front pump, pre pumping pump, etc., and maintenance pump and air tank are also equipped to prevent the air pressure fluctuation.
4) The pressure range of ultra-high vacuum unit is 10-6 ~ 10-10pa, the limit vacuum of main pump is 10-7 ~ 10-8pa or above, and the corresponding pumping speed shall be ensured in the pressure range. The material of system composition shall be able to withstand high temperature baking of 200 ~ 450 ℃ and ensure low air leakage rate and air outlet rate.
The vacuum unit system is a real-time monitoring and automatic adjustment of the key parameters of the vacuum unit, such as "vacuum degree (negative pressure or pressurization)", "flow", etc., such as the completion of "vacuum pressure maintaining", "automatic timing shutdown, start", timing and quantitative "vacuum suction filtration", etc., which is called the vacuum system.
As a means to realize intelligent automation, vacuum unit and system have been widely used in many aspects, such as electronics, semiconductor component assembly, automobile assembly, automatic handling machinery, light industry machinery, medical machinery, printing machinery, plastic product machinery, packaging machinery, forging machinery, robot, etc.

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How should vacuum pump leak?

For you to answer the vacuum pump leakage how to do.
1 vacuum pump seal is not tight
Tighten all the connecting bolts, tighten the packing gland, tightly wrap the pipes and connect the meters to other components. Or replace the gasket and packing. For air leakage, oil and lime can also be used as temporary remedial measures.
2 bearing deflection
This phenomenon causes the impeller to be tilted in the pump body. For a single acting pump, its axial clearance is uneven. When the blade is rotating, some part will be rubbed against the side cover, and the side cover and impeller end face will be scratching, so that the axial clearance will increase. The compressed cavity gas is leaked into the suction chamber through the enlarged gap, reducing the vacuum or exhaust pressure. At this time, the bearing should be removed for repair, and then installed correctly.
3 the front and rear side covers are not concentric
It is possible that the front and rear side covers of the vacuum pump have larger axial degrees and the consequence is the same as that of the bearing.
4 vacuum pump heating
When the vacuum pump temperature rises, the saturated vapor pressure will also increase, what's more, it will reduce the vacuum degree, but this has no effect on the exhaust pressure.
If we use vacuum pumps, we can analyze the above situation and see what is wrong with us.

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How to calculate the vacuum degree of vacuum pump

The commonly used vacuum units are PA, kPa, MPa, atmospheric pressure, kg (kgf / cm2), mmHg, mbar, bar, psi, etc.
Before selecting the type, we must make clear several basic concepts about vacuum pump.
Vacuum degree: the thinness degree of gas in vacuum state, usually expressed as vacuum degree. The value read from the vacuum gauge is called vacuum degree. The value of vacuum degree indicates that the actual value of the system pressure is lower than the atmospheric pressure. The value expressed from the table is also called the table pressure, which is also called the limit relative pressure in the industry, that is: vacuum degree = atmospheric pressure - pressure (the atmospheric pressure is generally 101325pa, the limit pressure of water ring vacuum pump is 3300pa; the limit pressure of rotary vane vacuum pump is about 10Pa)
Limit relative pressure: the relative pressure is how much lower the measured internal pressure is than "atmospheric pressure". It shows that the actual value of system pressure is lower than that of atmospheric pressure. Because the air inside the container is pumped, the pressure inside is always lower than the pressure outside the container. Therefore, when expressed in terms of relative pressure or gauge pressure, the value must be preceded by a minus sign, indicating that the internal pressure of the container is lower than the external pressure.
Limit pressure: the pressure is how much higher the measured internal pressure is than the theoretical vacuum (the theoretical vacuum pressure value is 0Pa). The object of comparison is the vacuum pressure value of theoretical state. Due to the limitation of technology, we can not pump the internal pressure to the value of 0 PA, so the vacuum value of vacuum pump is higher than the theoretical vacuum value. So when you use vacuum, there is no minus sign in front of the value.
Pumping capacity: pumping capacity is a measure of the pumping speed of a vacuum pump. General units are L / s and m3 / h. It is a parameter to make up the air leakage rate. It's not hard to understand why it's easy for a vacuum pump with a large volume of air to pump the vacuum degree we need, but a vacuum pump with a small volume of air can't even pump the vacuum degree we want? Because it's impossible for a pipeline or a container to keep air tight all the time, and a large volume of air can make up for the factors that lead to the decrease of the vacuum degree caused by the air leak, so, a large volume of air It is easy to get the ideal vacuum value. It is suggested that, in the case of calculating the theoretical pumping capacity, we try to choose a vacuum pump with a higher pumping capacity. The specific calculation formula of air extraction will be introduced below.
How to calculate the vacuum degree of vacuum pump:
After knowing the basic parameters of vacuum degree, pressure and relative pressure, we can enter the formal selection of vacuum pump.
1. Vacuum degree required by the process
The working pressure of vacuum pump should meet the requirements of process working pressure, and the vacuum degree should be higher than that of vacuum equipment by half to one order of magnitude. (for example, the vacuum degree of 100 Pa (pressure) is required for the vacuum process, and the vacuum degree of the selected vacuum pump shall be at least 50 pa-10 PA). Generally, if the pressure is required to be higher than 3300pa, the water ring vacuum pump is preferred as the vacuum device. If the pressure is required to be lower than 3300pa, the water ring vacuum pump cannot be selected, and the rotary vane vacuum pump or higher vacuum level vacuum pump is selected as the vacuum obtaining device.
2. Air extraction required by the process (extraction rate:
Vacuum pump requires air extraction rate (that is, the ability of vacuum pump to discharge gas, liquid and solid under its working pressure), general unit:
m3/h，L/S,m3/min。 The specific calculation method can refer to the following formula for self calculation and selection. Of course, the selection of vacuum pump is a comprehensive
The integration process involves relevant experience and other factors.
S=(V/t)×ln(P1/P2)
Where: S is the pumping rate of vacuum pump (L/s)
V is the volume of vacuum chamber (L)
T time required to reach the required vacuum (s)
P1 is the initial pressure (PA)
P2 is the required pressure (PA)
3. Determine the composition of the object to be extracted
*. whether the object to be pumped is gas, liquid or particle. If the gas to be pumped contains water vapor or a small amount of particles and dust and other impurities, the rotary vane vacuum pump should be carefully selected. If the vacuum degree is required to be high, a filter device should be added to filter before using the rotary vane vacuum pump as a vacuum obtaining equipment.
Second, it is necessary to know whether the object is corroded (acid or alkaline, what is the pH value?), if it contains acid-base corrosion or organic corrosion and other factors
The gas should be filtered or neutralized to select the rotary vane vacuum pump.
Third, is the object to be pumped contaminated with rubber or oil? For different media to be pumped, corresponding vacuum equipment should be selected. If there is a large amount of steam, particles and corrosive gas in the gas, it should be considered to install corresponding auxiliary equipment on the air inlet pipeline of the pump, such as condenser, filter, etc. (specific technical engineers).
Fourth, whether the noise, vibration and beauty of the vacuum pump affect the factory.
Fifth, as the saying goes, cheap is not good. When purchasing vacuum pump and vacuum equipment, priority should also be given to the quality of equipment, transportation, maintenance and repair costs, etc.

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The key to mend the defect of rotary vane vacuum pump

Vacuum pump is not unfamiliar to us, we can say that every corner of the day is inseparable from it. Through investigation, it is found that many customers will repair the defects of the rotary vane vacuum pump by themselves. If they can't solve the problem, they will find professionals again. During the process of repair by themselves, many people have wrong operation. The following small edition of Asian fluid network will introduce the key to repair the defects of the rotary vane vacuum pump.
Vacuum pump is not unfamiliar to us, we can say that every corner of the day is inseparable from it. Through investigation, it is found that many customers will repair the defects of the rotary vane vacuum pump by themselves. If they can't solve the problem, they will find professionals again. During the process of repair by themselves, many people have wrong operation. The following small edition of Asian fluid network will introduce the key to repair the defects of the rotary vane vacuum pump.
1. First of all, we need to know the type, characteristics and current situation of the pump. Understand the use requirements and determine the repair policy. Prepare inspection techniques before repair.
2. Identify and diagnose the problem. Accurate discrimination can save energy. The diagnosis should be verified.
3. To get rid of problems, first simplify, then complex, first easy, then difficult. Do not dismantle those that do not need to be disassembled. In order to reduce the new damage caused by the shortage of special tools and improper operation, and reduce the change of orientation and running in operation time. Generally speaking, the spliced rotor can not be disassembled, or the shape and position of the rotor will not be guaranteed in public service, and the rotor will be scrapped.
4. For toxic, harmful and corrosive rotary vane vacuum pump, please clean it first and inform the user of necessary protective measures to ensure the health of personnel.

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The connection mode of vacuum pump unit includes the following

Before using the newly purchased vacuum pump unit, as long as the cable is led out, you need to connect other cables when you connect the device. However, when you connect the cable, you must pay attention to the correct method, otherwise it will have a great impact on the use of the vacuum pump unit. Then, in order to work for us better, let's explain the connection method of the vacuum pump unit.
When the vacuum pump unit is wiring, it is necessary to use polyester insulating tape to cover half of the top circle. After covering 8-12 layers, it is necessary to use plastic tape to cover two layers for strength. When the vacuum pump unit is wiring, the copper core of its cable should be stripped about 30-35mm long, and the copper wire should be wiped clean and shiny with emery cloth, which is the same Strip 30-35mm copper wire of external three core cable, and clean it with emery cloth.
For the wiring of the vacuum pump unit, the three core cable and the stripped copper wire of the external cable will be inserted in pairs, and then a thin copper wire will be used to tie tightly as shown in the figure, and the rest will be cut off, and the scissors will be used to press flat, so as to avoid tying hands; when wiring, the three wire heads of the vacuum pump should be respectively welded with solder, and the surface of the welding head is required to be lubricated, free of burrs and false soldering, if not If it is firmly welded or not lubricated, the vacuum pump shall be welded from the beginning until it reaches the required stop.
For the wiring of vacuum pump unit, it is necessary to wrap three wires together with plastic tape and wrap them in two layers. The first layer exceeds the end of each wire insulation layer by more than 50mm, and the second layer exceeds the end of the first layer by 50mm; After bandaging, take a basin of cold water to soak the wrapped thread in water safely. After 12 hours, measure the insulation with a 500V megohmmeter to be no less than 50 megohm. Otherwise, bandage it from the beginning until it reaches the required stop.
The ground wire of the vacuum pump unit shall also be wrapped according to the wiring process requirements of the submersible cable; after the vacuum pump unit is connected, the insulation resistance shall be continuously telemetered and observed to change to prevent the cable insulation skin from being broken by hanging on the well wall. If it is found that the insulation degree drops rapidly below 0.5 megohm, it is necessary to raise the unit to the cause of continuous inspection.

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Please make a detour if you encounter vacuum pumps

Reciprocating vacuum pump, rotary vane vacuum pump, slide valve vacuum pump, roots vacuum pump is the reciprocating movement of the piston or rotation of the gas inhalation, compression and discharge. However, the piston is a working part, so the wear of the piston is unavoidable, with the increase of the number of maintenance work vacuum will continue to decline, until it can not meet the production requirements. This kind of pump work noise, oil consumption, high failure rate is also its fatal shortcomings, generally need to set up a spare machine, which virtually increases the equipment investment and operating costs. In addition, if the use of this type of pump suction water vapor and other condensable gas, will emulsify the lubricating oil, so can only be applied in the suction of non-condensable (air class) gas, can not suction with granular medium, which also limits its scope of application.
Water ring vacuum pump is installed in the pump shell with multi-blade eccentric rotor rotation, throwing water to the pump shell and pump shell concentric water ring, the water ring and rotor blade formed a volume cycle change in order to suction, compression and exhaust gas. Its disadvantage is low vacuum; Do not pump granular media; High speed rotor rotation is not easy to do corrosion treatment, so do not pump corrosive media.
Then what should be paid attention to when using these vacuum pumps? The vacuum required for each process must be checked first. Because each process has its own vacuum range, it must be carefully studied and determined.
Check the ultimate vacuum of the vacuum pump system based on the determination of the vacuum required by the process, because the ultimate vacuum of the system determines the optimal operating vacuum of the system. Generally speaking, the ultimate vacuum of the system is 20% lower than the operating vacuum of the system and 50% lower than the ultimate vacuum of the front stage pump.
Check and determine the type and volume of pumping required by the process. Because if the type of gas pumped reacts with the liquid in the pump, the pump system will be contaminated. At the same time, the proper exhaust time and the amount of gas produced during the extraction must be considered.
Check to determine the time required to achieve the required vacuum, flow resistance and leakage of the vacuum pipe. Consider the extraction rate required to maintain vacuum under certain process requirements after the required vacuum degree is achieved.
Vacuum pump selection calculation
Where: s is the vacuum pump pumping rate (l/s) v is the vacuum chamber volume (l) t is the time required to achieve the required vacuum degree (s) p1 is the initial vacuum degree (torr) p2 is the required vacuum degree (torr)
This is where you need to pay attention to maintenance when choosing or using vacuum pumps


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How to ensure the normal heat dissipation of Roots vacuum unit

1. If the heat is not dissipated in time, the internal parts of the vacuum unit will be affected for a long time. This will affect the normal operation of the fan seriously or even damage. Therefore, heat dissipation is a noticeable problem;
2. There are many kinds of heat dissipation schemes of Roots vacuum unit to determine the appropriate heat dissipation scheme according to the heat quantity of different parts of the body. When the working pressure is high, the temperature rises quickly. The common unit with high temperature needs circulating water for cooling and cooling, so as to protect the fan or the bearing and gear will be damaged easily when they work under high temperature.
At the same time, roots vacuum unit is widely used in chemical industry, food sublimation drying, high altitude simulation test and other vacuum systems. After reading so many questions about its heat dissipation, if you have any questions, please contact us. We warmly welcome your visit.
In recent years, the benefits of Zibo boster Pump Co., Ltd. have been developed rapidly, the scientific and technological content of the products has been continuously improved, the comprehensive strength is strong, the product market network has been gradually improved, and more than 40 agent sales outlets have been set up in various provinces and cities of the country. The enterprise is based on science and technology, and the product quality is the standard. The product has passed the inspection of Zibo Technical Supervision Bureau and the quality inspection center of mechanical and electrical products, and has issued the product qualification certificate. If you have any further requirements, please contact us.

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A brief introduction to the performance of vacuum pump unit oil

First of all, we should pay attention to the vacuum pump unit oil. As far as it is concerned, it actually has a better sealing performance. To a large extent, it needs a more suitable viscosity. Under low temperature, it can make the vacuum pump unit start quickly. Under high temperature, the vacuum pump oil can In fact, it will have a better sealing performance.
Moreover, the vacuum pump oil in the vacuum pump unit actually has a relatively low temperature rise. To this extent, it will not contain light volatile components to a large extent. To a large extent, it will directly reduce the oil return rate of the vacuum pump in its own application process.
Then, the saturated vapor pressure of vacuum pump oil in vacuum pump unit actually needs attention, which is actually an important index of vacuum pump oil. In a closed vessel with constant temperature, we should pay attention to the pressure when the vapor-liquid phase reaches dynamic equilibrium, which is called saturated vapor pressure.
To a large extent, the saturated steam pressure of the oil products of vacuum pump unit should be lower as far as possible, and to a large extent, it should be lower enough as far as it is under the high working temperature of the pump, And, to a large extent, it should be directly lower than the limit pressure of vacuum pump rules.
Later, when it comes to the saturated steam pressure of vacuum pump unit oil at 60 ℃, to a large extent, it should be noted that it should be at least 6.5 × 10-5 kPa (because the saturated steam pressure of vacuum pump unit oil will directly drop by an order of magnitude every 20 ℃ rise in temperature).

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Vacuum unit information

Conservative high vacuum pumps are within a few Pa range. Therefore, the front pump must be pre-pumped to this pressure before the main pump can start to work. However, it often takes a long time for the fore-stage pump of direct discharge to reach this pressure. Another reason why high vacuum units often need three stage units is due to the limitation of suction pressure of high vacuum pumps. All pumps have initial operating pressure. Because as the pressure to reduce the pumping speed of the pump in reducing, especially for the periodic vacuum suction unit, to meet the requirements of the vacuum degree of work time is the drainage of the longer the time, also the longer period of time in the vacuum degree of work, therefore, increase the taichung with low level before the vacuum pump, vacuum pump can achieve in a relatively short time main pump can work stress, so that we can make the system as soon as possible into the work pressure, guarantee the efficiency of the equipment.
Roots pump and oil booster pump can be used as medium vacuum pump, the molecular booster pump has a very high compression ratio, which in addition to enabling it to obtain a clean vacuum but also has excellent high vacuum performance, while in the vacuum range also has a super pumping capacity. This makes the molecular booster pump into the current both high and medium vacuum performance of the vacuum pump, so only need to cooperate with the low vacuum pump can be composed of a high vacuum unit performance comparable to the three units. Specifically, due to the high pressure of the molecular booster pump, so the front pump can be easy to be in a high flow state; And the molecular booster pump suction pressure, reducing the pre - pumping burden of the pump. The molecular booster pump can work in 100-50pa, the front stage pump from the atmosphere to this pressure, basically follow the law of every time pressure reduction by an order of magnitude, therefore, the unit can have a very high pumping efficiency. Simplifying high vacuum units and eliminating roots pumps is another advantage of molecular booster pumps.
For larger high vacuum application equipment, can also be appropriate to strengthen backing pump drainage ability, further shorten extraction time, due to the drainage time compared with the whole process of exhaust is very short, so the pump before use time is very short, so you can double as many sets of equipment of the drainage effect, and it is often very real vacuum pump oil in the air (oxygen) and the presence of metal catalysts, oxidation time, under a certain temperature can present the changes of acid value, viscosity of oil and generate the status of the sediment. With the application process and the attack of oxidation, so gradually produce some aldehydes, ketones, acids and colloid, asphaltene and other substances, oxidation stability is to inhibit the above conducive to the use of oil substances generated performance. Water vapor in the tightening process will condense into water droplets, and mix with the pump to form a suspension, not only will make the vacuum degree landing, but also can make the pump cavity and rotor rust, damage the sealing surface, the ultimate vacuum degree landing pump. Therefore, it is important to prevent water vapor from contaminating mechanical pumps.
The prevention measures of vacuum unit are as follows:
Oil seal mechanical pump with gas ballast device is selected; Filling oil separator, centrifugal separator or oil and water separator, will be mixed with water to stop the disposal of the mechanical pump oil, the disposed oil into the pump for use; Use single adjustment with strong water absorption; The use of liquid nitrogen cold trap can not only effectively absorb water vapor, but also prevent the mechanical pump oil from flowing back to the high vacuum chamber.
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How often does the rotary vane vacuum pump oil

First to choose the vacuum pump oil, 1#, 3#, 100# can! If the requirements are not high enough to replace the use of general oil vacuum pump oil (do not affect the use). Oil has a certain viscosity, viscosity of the concave and convex resolution of the vacuum pump sealing, viscosity is too small, sealing is not good.
Too high viscosity, will increase the conflict between the pump blade and cylinder, smooth effect will become worse, together, the rotor rotation will become difficult, the motor pressure will become high, the oil temperature will become higher and higher. The increase of oil temperature will accelerate the emulsification degree of pump oil and affect the vacuum degree of concavity.
The full volume vapor pressure of vacuum pump oil is low, the light distillation is less. If is the general vacuum pump oil or oil is very simple evaporation, the use of non-vacuum pump special oil is often in the face of refueling situation. Vacuum pump special oil chemical properties tend to be more stable, the content of water, water soluble acid, insoluble alkali and other impurities is much smaller, the use of special oil energy to avoid repeated replacement of vacuum pump oil and ensure the cleanliness of the pump.
From the above points can be seen, the use of regular vacuum pump special oil can be useful to avoid the pump oil emulsification, carbonization and other elements of vacuum pump bad gas, fundamentally deal with the vacuum pump maintenance difficulty, improve the vacuum pump service life.
How often do I have to fill up? Disc vacuum pump has an audition, in the vacuum pump box side, the naked eye can be investigated. Refueling every time the demand to add to the middle line of the orientation of the audition, not more, more will make the work of the state of oil may oil phenomenon. Natural oil lack of ordinary remember to make up for good.

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What is reciprocating vacuum pump

A vacuum pump that draws air by periodically changing the working volume of the pump cavity (cylinder) due to reciprocating motion of the piston, also known as piston vacuum pump. The structure of reciprocating vacuum pump is similar to that of reciprocating piston compressor. During operation, the suction pipe is connected to the evacuated container, and the exhaust pipe is directly connected to the atmosphere. The pumping rate of reciprocating vacuum pump is 45-20000 cubic meters per hour, the limit pressure of single-stage pump is about 103 PA, and that of double-stage pump is up to 1 PA. Reciprocating vacuum pump can be used for vacuum distillation, vacuum concentration, vacuum crystallization, vacuum filtration, vacuum drying and concrete vacuum operation. If a condenser is installed at the suction port of the pump, the gas containing water vapor can be removed; if a filter is installed, the gas containing dust can be removed.
Working principle of reciprocating pump. The main components of the pump are cylinder 1 and movable block 2 in which reciprocating linear motion is made. The driving of the mobile village is completed by the crank link mechanism 3. In addition to the above main components, there are exhaust valve 4 and suction valve 5.
When the pump is running, driven by the motor, the piston in the cylinder will do reciprocating motion through the function of the crank connecting rod mechanism. When Wang room is waiting for GE to move from the storage end to the right end. As the volume of the left chamber of the cylinder increases, the density of the gas in the cylinder decreases, and the air extraction process is formed. At this time, the gas in the container enters the left chamber of the pump body through the suction valve 5. When the piston reaches its rightmost position, the cylinder is completely filled with gas. Then the piston moves from the right end to the left end, and the suction valve 5 is closed. The gas in the cylinder is gradually compressed as the piston moves from right to left. When the pressure of the gas in the cylinder reaches or slightly exceeds one atmospheric pressure, the exhaust valve 4 is opened to discharge the gas into the atmosphere and complete a working cycle. When the piston moves from left to right again, it sucks in a part of gas, and repeats the previous cycle, and so on, until the gas pressure in the pumped volume reaches the requirements.
In practical application, in order to improve the efficiency of air extraction, the pump mostly adopts double acting cylinder, that is, the piston can compress and extract air simultaneously in two directions (reciprocating), which is mainly realized by the valve. The domestic W-type reciprocating pump is a single-stage double acting pump.
Reciprocating pump has dry and wet. Dry pump can only pump gas, wet pump can pump gas and liquid mixture. There is no principle difference between the two in terms of structure, but the size of dead space and distribution mechanism in wet pump is larger than that of dry pump, so the limit pressure of wet pump is higher than that of dry pump. There are two types of reciprocating pumps, horizontal and vertical (domestic W and WL). The vertical pump is more advanced in structure and performance. It is a new generation of horizontal pump.
Advantage:
(1) The average power consumption is reduced by 1 / 3, and the energy saving is significant. For example, the original W5 power is 22KW, while wlw-200b is 15kw; the original W4 is 11kw, and wlw-100b is 7.5kW.
(2) The floor area is reduced by an average of 2 / 3. For example, the original W5 type occupies an area of 3.8m, while wlw-200b is 1.2m.
(3) Vibration reduction. WLW series pumps eliminate the S-wave inferior vibration and reduce the noise by more than 5dB on average.
(4) Long service life. The vertical pump has reasonable structure and uniform stress, which reduces the wear of each moving part.

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What are the advantages of oil-free vacuum pumps?

What are the advantages of oil-free vacuum pumps? Oil-free vacuum pump products are applicable to a wide range of products, but in the purchase of special attention, the product has been different from the past, the society in progress, science and technology in the development, people's living standards are also improving, with the increase in the demand for products, promote the product also with The Times. Taiwan ruixu vacuum equipment co., LTD. 's products after years of research and development and innovation, products can not only meet the needs of enterprises, but also in the after-sales aspects are guaranteed.
Oil free vacuum pump in the purchase need to pay attention to what?
1. The working pressure of oil-free vacuum pump shall meet the requirements of ultimate vacuum and working pressure of vacuum equipment. For example, a certain vacuum drying process requires a working vacuum of 10mmHg, and the ultimate vacuum of the oil-free vacuum pump should be at least 2mmHg, preferably 1mmHg. Generally, the ultimate vacuum of the selected pump is half to an order of magnitude higher than the operating vacuum of the vacuum equipment.
2, the correct choice of oil-free vacuum pump operating point. Each pump has a certain working pressure range, such as: 2BV series water ring oil-free vacuum pump working pressure range of 760mmHg~25mmHg (absolute pressure), in such a wide pressure range, pump pumping speed changes with pressure (refer to the pump performance curve for detailed changes), its stable working pressure range of 760~60mmHg. Therefore, the pump operating point should be selected in this range is more appropriate, and can not let it in 25~30mmHg long-term work.
3, oil free vacuum pump in its working pressure, should be able to drain all the gas produced in the process of vacuum equipment.
4. Requirements for oil pollution of vacuum equipment. If the equipment strictly requires no oil, should choose a variety of no oil pump, such as: water ring pump, molecular sieve adsorption pump, sputtering ion pump, cryogenic pump. If the requirements are not strict, you can choose to have the oil pump, with some anti-oil pollution measures, such as cold trap, baffle, oil trap, can also meet the requirements of clean vacuum.


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Troubleshooting of dry vacuum pump

Today, we will focus on the troubleshooting of dry vacuum pump. Before mastering the troubleshooting skills of the dry vacuum pump, it is necessary to know its working principle and application scope, so as to determine the necessary operation skills and mechanical maintenance knowledge of the dry vacuum pump, and quickly determine the fault location according to the abnormal conditions of the pump.
Correctly mastering the maintenance requirements of dry vacuum pump can reduce the equipment failure caused by inadequate equipment maintenance.
Maintenance procedures for dry vacuum pump:
1 operation precautions
(1) Check whether the equipment and pipes are connected normally before each startup.
(2) Before starting, make sure that the air inlet and exhaust pipes are free of foreign matters. First, open the pipeline valve at the air outlet to prevent pressure holding.
(3) After starting the vacuum pump, open the air inlet pipeline valve again to prevent foreign matters from entering the cavity and causing jamming
(4) Observe the oil level window and check whether the lubricating oil is sufficient
(5) For the working condition containing viscous substances or dust, the filter screen and pump chamber shall be cleaned regularly. It is recommended to clean before stopping the pump every time
(6) Open the motor cover and rotate the motor shaft for 5-10 turns or steam for 10 minutes if the machine is not started smoothly after the intermittent condition shutdown
(7) When the condensable gas is extracted or the ambient humidity is too high, a proper amount of dry air shall be introduced before stopping the pump and the pump cavity shall be emptied
(8) To stop the pump for a long time, it is necessary to close the air inlet valve, start the vacuum pump for 20 minutes, then close the discharge port, and then stop the pump to avoid water vapor entering
(9) Ensure that the quantity and temperature of circulating cooling water in operation meet the technical requirements, and stop the pump in case of water interruption;
(10) When the ambient temperature is lower than zero, the circulating cooling water flow shall be ensured when the pump is stopped to prevent the cavity from frost cracking
(11) Under the working condition with condensable gas, the exhaust pipe must be lower than the exhaust port, the exhaust port shall be upward, the tee shall be connected, and the recovery tank shall be connected below.


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Pay attention to the start and stop sequence of Roots vacuum pump

Let's start with the startup program.
In addition to multi-stage, wet and air-cooled Roots vacuum pumps, conventional roots vacuum pumps need to be combined with the previous pump to avoid equipment damage due to high differential pressure. Therefore, before starting the roots vacuum pump:
① Start the front pump; ② open the valve on the pre pumping pipeline of the front pump and the intake and exhaust valve of Roots vacuum pump;
When the pressure in the system reaches the allowable inlet pressure of Roots vacuum pump (the allowable inlet pressure of Roots vacuum pump from different manufacturers will be different), close the valve on the pre pumping pipeline, and then start the roots vacuum pump. If there is no such pre pumping pipeline, the roots vacuum pump can be started after the front pump reaches the allowable inlet pressure of Roots vacuum pump.
Of course, in many occasions, automatic electrical control has been realized through setting, and this part of starting process does not need manual intervention. For example, the roots screw unit of kelexi, a screw vacuum pump manufacturer, can be customized according to the needs of customers to realize the functions of automation and remote control, making the operation more simple and convenient.
The roots vacuum pump must be used in strict accordance with the technical specifications. In general, the inlet pressure of Roots vacuum pump is under 1330pa, which has a good pumping efficiency (the highest pumping efficiency section should be in the range of 100-1pa). The highest inlet pressure in application should not exceed its allowable maximum inlet pressure, and it is not suitable to operate too long under the high inlet pressure. In addition, under normal operation, the maximum temperature rise of the general pump shall not exceed 40 ℃, and the maximum temperature shall not exceed 80 ℃, which shall be determined according to the specific characteristics of the manufacturer's products. There shall be no irregular abnormal vibration and noise during operation. In case of motor overload, high temperature rise, abnormal sound and large vibration during current operation, stop the machine immediately to check the cause and eliminate the fault.
Then we'll talk about the shutdown procedure.
If the front stage pump of Roots vacuum pump is an oil sealed mechanical pump, and the air ballast is open, first close the air ballast valve of the front stage oil sealed mechanical pump; then close the air intake valve of Roots vacuum pump; in the next key step, first stop the roots vacuum pump, then stop the front stage pump, and it is strictly forbidden to mistake the shutdown procedure; at the same time of stopping the front stage pump, immediately vent the air at the air inlet of the front stage pump; finally, close the cooling water Inlet valve.
In addition, if it is necessary to stop using for a long time and prevent frost crack in winter, the remaining water in the cooling water jacket shall be drained.

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The importance of filter element in Roots vacuum unit

Roots vacuum unit has a kind of filtering function in use, which is inseparable from the role of filter element. In order to better realize the filtering function and improve the efficiency of the equipment, it is also necessary to regularly maintain the filter element.
The filter element of Roots vacuum unit shall be inspected frequently to avoid failure affecting the whole equipment. After the filter element is used for a period of time, it is strongly recommended to replace it. It can't be used for any other purpose, so that not only the good filtering effect can't be achieved, but also the operation of the machine will be affected.
Generally, before opening roots vacuum unit, we will check whether the parts are complete and whether there is any fault, so as to avoid problems in use and affect the working efficiency. For filter element, we can open the machine to see the driving current after all the parts are checked to be OK. If the current is normal, it will be OK, but if the current has a downward trend It is likely that the filter element of Roots vacuum unit is blocked, which affects the operation of current.
The filter element of Roots vacuum unit shall be inspected regularly. If there is too much dirt, it is recommended to replace the filter element to ensure the normal operation of the equipment.

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2BE vacuum pump ambient temperature in service

In addition to the first b-a type ultra-high vacuum gauge, the full-pressure side gauge of the ultra-high vacuum system has also developed many extremely high vacuum gauges, such as cold cathode magnetron gauge, suppression gauge and bend gauge. But for many studies, total stress data alone are not enough. For example, the adsorption, condensation and desorption processes in the vacuum system of 2BE vacuum pump involve the interaction between the surface of the container and the substances inside the system and the residual gas molecules:
The data of gas composition and partial pressure in the system are more illustrative than the data of full pressure. Gas analysis and partial pressure measurements under vacuum conditions are usually performed by dynamic mass spectrometers. In the medium to be transported, if there are solid particles, the pump inlet to add a filter: if there are ferromagnetic particles, need to add a magnetic filter. 2BE vacuum pump in use the ambient temperature should be less than 40℃, motor temperature rise should not exceed 75℃. After 1000 hours of normal operation, the magnetic pump should be removed to check the wear of the bearing and end ring, and replace the vulnerable parts that are not suitable for reuse. For the transport fluid is the medium that is easy to precipitate and crystallized, it should be cleaned in time after use to drain the accumulated fluid in the pump.
2 be vacuum pump must always keep clean, vacuum pump shall not be placed on other items, shall not be blocked vacuum pump around the channel, and to facilitate maintenance and operations, often pay attention to the elastic v-belt, adjust, often pay attention to whether the pipe joint leakage, and the casing vacuum has declined, otherwise to timely maintenance, often pay attention to whether the cooling water flow, to drive every time a discontinuous start 4 to 6 times, each time less than 2 s, to overcome the large torque when it is started.


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How to prevent corrosion of Roots vacuum unit

The roots vacuum unit is equipped with an eccentric rotor with fixed blades, which throws water (liquid) to the stator wall. The water (liquid) forms a liquid ring concentric with the stator. The liquid ring and the rotor blades together form a rotary variable volume vacuum pump with variable volume.
Now in some large-scale chemical plants and highly corrosive industries, the material requirements of Roots vacuum unit are more and more stringent. In order to reduce the cost, some factories will require the impeller of Roots vacuum unit to be stainless steel impeller or the overflow parts to be stainless steel, but in the actual use process, the pump will be seriously corroded in a few months, which actually greatly increases the production Cost of production. In view of this situation, our company's engineers have studied a set of appropriate solutions through continuous tests.
The solution is to armour chemical ceramics inside the pump body and the cast iron shell with two side covers, fill the binder between the cast iron shell and the chemical ceramics, and seal the end face of the joint with resin. The impeller of Borui steel is fixed on the main shaft with a steel key. A Borui steel shaft sleeve is installed on both sides of the impeller to protect the main shaft from contacting with corrosive media. The shaft seals at both ends are mechanical seals.
The application of Roots vacuum unit made of the above anti-corrosion measures in the production process of selenium shows that its service life is more than 8 times longer than that of ordinary cast iron pump. The latter can not withstand the corrosion of sulfur dioxide and selenium dioxide gas, and the pump is damaged after one to two months, which seriously affects the continuous industrial production and increases the cost of spare parts and maintenance. If the vacuum unit is made of stainless steel, the manufacturing cost of the pump will be increased by more than three times. Some manufacturers try to spray corrosion-resistant materials on the overflow part of the vacuum unit by thermal spraying method, but it fails because the bonding strength between the sprayed materials and the body is weak and it can not withstand the erosion of the liquid ring.

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What is the overload of Roots vacuum pump motor?

Generally speaking, roots vacuum pump starts under normal conditions, and there will be no overload. Some users reported that it was difficult to start the roots vacuum pump again after it was shut down for a period of time. This kind of instantaneous large load start-up of the vacuum roots vacuum pump will greatly shorten the service life of the roots vacuum pump, and may even make the roots vacuum pump shut down due to failure. Why does this happen?
We know that the installation of Roots vacuum pump requires that the body of Roots vacuum pump is lower than the vacuum point and also lower than the exhaust pipe. When roots vacuum pump stops after working for a period of time, the rest of the extracted water and water seal water will stay in the intake pipe and roots vacuum pump cavity, and its water level is enough to submerge the entire roots vacuum pump cavity.
Before start-up, if the residual water is not removed in time, when the roots vacuum pump starts, the static residual water has great resistance to the rotor in the cavity of the roots vacuum pump, which is the main reason for the difficulty of starting and pumping the roots vacuum pump. In order to solve this problem, a check valve (or 3 / 4 of the time) can be installed below the center line of the intake pipe of Roots vacuum pump, which can automatically discharge residual water. The function of the valve is to automatically close the valve when roots vacuum pump is working, and automatically discharge residual water immediately after shutdown.
When we use roots vacuum pump, we also need to pay attention to the following two problems:
1. The diameter of the suction and exhaust pipes must be consistent with the suction and exhaust holes of Roots vacuum pump. The distance between vacuum roots vacuum pump and vacuum tank shall be as short as possible. The fewer bends, the better. The centerline of suction pipe installation shall not be lower than the centerline of suction hole. The center line of the exhaust pipe shall not be higher than the center line of the exhaust hole.
2. For newly installed pipes, special attention shall be paid to the removal of dross, especially welding dross. Otherwise, at the moment when the roots vacuum pump starts, the dregs in the pipeline will soon be sucked into the roots vacuum pump, and the larger particles will enter between the two rotating rotors together with the water seal water by their own weight, so that the high-speed rotating rotor will be stuck immediately (when the user is testing the new roots vacuum pump). This is the case with the abnormal noise. It can even make the shaft elastic deformation or bending, and produce angular displacement between the rotors, which greatly shortens the service life of the blades of Roots vacuum pump.

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The reason of water ring vacuum pump shaft fracture

Liquid chemicals are pumped and discharged frequently in many manufacturing industries, so the use of various pumping machines and equipment is essential. The water ring vacuum pump is not only simple in structure and convenient in maintenance, but also suitable for sucking liquid and reducing flammable and explosive substances, such as vapor, smoke, water vapor, etc. Therefore, it is warmly welcomed by many manufacturing industries. Next, the manufacturer of 2bv6 water ring vacuum pump will show you the reason for its shaft fracture.
The bearing end cover gap of 1.2bv6 water ring vacuum pump diesel engine is too large or seriously corroded, which causes the shaking of the front and rear during operation.
2. If the main rolling bearing on the end line has crevice corrosion or the rolling bearing turns over, the vibration at the rear side of the diesel engine shaft will be more and more large.
3. The main rolling bearing of the mechanical equipment is damaged too much, resulting in long-term falling off and cracking of the rear half of the diesel engine shaft. This is usually because the axial vibration of the diesel engine shaft is often caused by the fracture of the diesel engine shaft.
4. When the water ring vacuum pump shaft bends too much and is not concentric, and the clearance flow of the main rolling bearing is tight and unevenly loose, the diesel engine shaft is blocked in the process of rotation, so if the front, rear, left and right loads of the diesel engine shaft are uneven, the axial vibration will occur very frequently.
5. The main rolling bearing and crankshaft rolling bearing have multiple cracks corrosion, which will gradually weaken the gap corrosion position force of the support plate, so the axial vibration of the shaft will be very frequent. If the root crack corrosion occurs after the in-situ stress change, the fracture will occur between one shaft and the arm.
6. If the clearance between adjacent main rolling bearings is too large, the clearance between the last two main rolling bearings and the first two main rolling bearings will be very large. If the clearance is too large, there is a flywheel behind the diesel engine shaft and a pulley in front of the diesel engine shaft. Too much pressure on both sides of the diesel engine shaft will also cause frequent axial vibration.
7. The diesel engine shaft of mechanical equipment is loaded with air compressor. When the load of air compressor expands, the diesel engine shaft will be corroded or loosened, which will cause axial vibration.
8. The supporting plate force of the rolling bearing of the water ring vacuum pump and the coaxiality of the main shaft bearing vary greatly, which will concentrate the in-situ stress on the arm. In addition, the arm itself is weaker than the motor shaft, which is easy to break.
The above is the reason why the shaft of 2bv6 water ring vacuum pump is damaged. On the surface, such common faults usually occur in an instant, but in fact, they are the result of the deterioration caused by the accumulation of quantitative changes to a certain extent. Therefore, in normal application, proper prevention and maintenance based on matching shaft fracture still has certain preservation opportunities, I hope you can be familiar with it.

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