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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2XZ rotary vacuum pump leakage solution

Rotary vane vacuum pump is widely used, is a kind of vacuum equipment, most of our manufacturers used to match the vacuum drying box. Recently, a customer in jiangsu province, in a vacuum drying and and rotary vane vacuum pump when doing the experiment, the rotary vane vacuum pump the oil spill, say starting power button, the exhaust valve on rotary vane vacuum pump did not open, the consequence is the temperature inside the pump, oil pump suction, unplug after the pipe connection, once again open the power of the rotary vane vacuum pump, oil pump and flow from inlet nozzle, lie between a day later, the inside temperature is down, but open pump, oil pump or out, customers don't know what to do, so consulting us.
Through technical analysis, research and experiment, four conclusions are drawn, specifically as follows:
1. The motor is connected backwards, that is, the pump is reversed, to see whether the direction of rotation and the above marks are the same;
2. There is no fault in the vane pump itself, disconnect the outlet and inlet pipelines of the pump, and then start the pump again for 10 minutes to see if it is normal;
3. Check the sealing ring, the sealing ring is worn or assembled incorrectly; The sealing ring is worn, replace the sealing ring, if the assembly is wrong, reassemble;
4. Check whether the front and rear end faces of rotary vane vacuum pump are smoothed, and whether the end plates are tightened; If it is not tight, repair the end face flat, tighten the end plate.
Above is the analysis and arrangement of oil leakage fault of rotary vane vacuum pump, hoping to help the general rotary vane vacuum pump. What about rotary vane vacuum pumps? Can be used alone, can also be used as booster pump, diffusion pump, molecular pump and titanium pump, and can also be used for electronic device manufacturing, vacuum drying, filtering, welding, metal smelting.
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Stainless steel centrifugal pump transformation of lubrication mode

The lubrication of rolling bearing of stainless steel centrifugal pump is mainly to reduce friction power consumption and wear rate. At the same time, it also plays an important role in cooling, dust prevention, rust prevention, vibration reduction and other aspects. Good lubrication of equipment is the guarantee of normal operation of equipment. Take effective measures to reduce equipment wear, prevent equipment accidents, reduce power consumption, and extend maintenance cycle and service life.
The roller bearing of this pump is lubricated by 30 × in winter or 40 × in summer. Due to design reasons, dynamic seal leakage is very serious, which not only causes a lot of oil waste, burning bearings, but also pollutes the environment, which is not conducive to the safe operation and civilized production of the equipment. In the course of several years' work, many small changes have been made to solve this problem.
1、 The process of changing lubrication mode
[felt seal to single layer framework oil seal]
The original bearing box is sealed with felt. The oil leakage is very serious. Each pump consumes about 300 kg of oil, causing a large amount of oil waste and thick oil layer on the ground.
In order to change the oil leakage, change the felt seal to the skeleton seal as follows:
1. The bearing box and outer end cover are processed and manufactured with Φ 65 mm deep 12 mm round holes, which are suitable for 45 mm × 60 mm × 12 mm skeleton oil seal.
Remove the felt, tap the framework oil seal gently with a hammer, and install it correctly.
After the transformation, the equipment operates normally, the vibration displacement is about 0.04mm, the external temperature of the bearing is about 50 ℃, and the annual oil consumption of each pump is only about 50kg. The pump room is kept clean and sanitary, the occurrence of bearing and shaft damage accidents is eliminated, and the equipment is in good operation condition.
[single skeleton oil seal to double skeleton oil seal]
In order to reduce the leakage, according to the structure of the end cover of the bearing box, a modification scheme is proposed, and the inner hole of the end cover of the bearing box is processed into a Φ 65 mm through hole. Change single-layer framework oil seal to Double-layer framework oil seal:
The test results show that this method can effectively prevent oil leakage in a short time. However, after six months of continuous operation, the wear of the skeleton oil seal will increase the leakage.
2、 Frame oil seal defect
Change the felt seal to the framework oil seal and use 4a. Although the effect is good, there are obvious defects.
In actual work, due to the relatively short service life of skeleton oil seal, it is necessary to replace skeleton oil seal. When replacing skeleton oil seal, on the one hand, all equipment shall be disassembled, on the one hand, the labor intensity of workers shall be increased, on the other hand, in the process of equipment disassembly and maintenance, sometimes it will cause damage to impeller, bearing and other parts, which does not meet the requirements of equipment economic management, but if there is no oil Sealing, not only is not conducive to sealing, but also directly affects bearing life. The practice shows that the framework oil seal does not completely solve the problem of oil leakage in the bearing box of this structure.
3、 Grease instead of oil
At present, there is no cheap and leak free sealing device, some of which have good sealing effect, but they are expensive and economically feasible. After investigation and study, it is decided to test boldly and use lubricating grease instead of lubricating oil for lubrication.
[transformation method]
Considering that the power of the pump shaft is 18.5kw, the flow is only 200m ~ 3 · h, the pump speed is 1450 R / min, and the linear speed is 3.4m/s, it is feasible to lubricate with grease from the above two points.
[the specific method is as follows]
(1) Remove the oil from the tank and clean the bearing housing.
(2) Plug the end covers and drain holes at both ends of the bearing box to remove the air in the box.
(3) Use a grease gun to inject lithium grease into the bearing box from the oil filling hole, extrude the grease from the covers and drain holes at both ends as filling, and fasten the end covers of the bearing and the wire plugs of the drain holes. Use the handwheel to distribute the grease evenly in the box.
After starting the pump, open the outlet valve to make the pump operate under normal conditions, and monitor the bearing temperature and oil quality at both ends of the pump.
The lubricating grease has good quality, no change, and the pump operates normally. It can be seen from the temperature monitoring data and vibration monitoring data that it is feasible to replace lubricating oil with lubricating grease, which can be widely used in similar pumps.
[grease lubrication effect]
The grease is not easy to leak, is conducive to the lubrication of pump bearings, ensures the safe and stable operation of the pump, and greatly reduces the number of refueling and refueling. It not only saves fuel, but also reduces the labor intensity of workers. Specifically:
(1) Save on oil costs. Each pump consumes 9 kg / A, the cost is 63 yuan / A, the oil consumption is good, the skeleton oil seal is 4kg / A, the cost is 200 yuan / A, each pump can save 137 yuan / A, greatly reducing the lubrication cost.
(2) Reduce maintenance costs. The average life of framework oil seal is 4 months. In order to replace the framework oil seal, it needs to be disassembled and overhauled about three times a year, and replaced with lithium-based grease to reduce the labor cost. Cost of materials and machinery to avoid damage to equipment parts during maintenance.
(3) The operation cycle of the equipment is prolonged. From vibration. The monitoring of temperature and other aspects shows that the use of lubricating grease has good sealing performance, the bearing runs well, and the service life of the bearing is prolonged.
(4) Improved the post environment.

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