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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Basic points of vacuum pump maintenance

Because vacuum pump is often used in high temperature, high pressure, strong corrosion of the harsh environment, it is inevitable to have a variety of damage, we want to extend its service life, so that it can be used in various industries for a long time, it needs regular maintenance. In fact, the maintenance of vacuum pump is a troublesome thing. Many times, it will affect the future work if it is not handled in time. Let's see what the basic points of maintenance of vacuum pump are.
1. Never work with faults: when carrying out the maintenance of vacuum pump, there is another factor that we must pay attention to, that is, we must not let our equipment work with faults, because this will not only affect the work effect, but also may cause more serious consequences.
2. Master the basic maintenance requirements: each vacuum pump will have a very detailed maintenance instructions. Generally speaking, as long as people have problems with the vacuum pump, they should first compare the maintenance requirements of the equipment to find out whether they are doing the product maintenance poorly or not, resulting in a simple Faults, these faults, are generally in accordance with the instructions, can be handled very well, is also a very simple fault.
3. Contact after-sales service in time: if the failure of your own vacuum pump is a relatively large failure, which has seriously affected the failure effect, in this case, when carrying out vacuum pump maintenance, you must pay attention to contact your own after-sales service in time, and carry out maintenance under the professional guidance of after-sales service. Generally speaking, the after-sales service team All of them will arrange professional after-sales personnel in time for docking treatment, so this treatment is also very simple.
4. Electrochemical cleaning: put the metal parts to be cleaned in a certain solution, connect the parts to the positive or negative pole of the power supply, and then connect the plate made of a certain material to the other pole of the power supply, adjust the power supply voltage, obtain a certain current density, so as to achieve the purpose of removing oil and oxide layer on the surface of the metal.
5. Acid and alkali etching treatment: after degreasing, the etching treatment is carried out to remove the oxide on the metal surface. For the parts after heat treatment, the oil stain does not exist, so the etching treatment can be carried out directly to remove the annealed oxide layer. Generally, etching treatment is carried out in acid solution. Most metal oxides and metal itself can react with acid solution of appropriate concentration. Oxides react with acid to generate salt and water, while metals react with acid to generate salt and hydrogen. Part of hydrogen absorbed by metal surface will make some metals brittle. In order to avoid metal embrittlement and excessive corrosion, it can be used in etching solution Add inhibitor, and control the concentration and temperature of etching solution properly.

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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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Assembly method of rolling bearing and coupling of water ring vacuum pump

Water ring vacuum pump is a kind of vacuum pump used in factory. It is usually used in various industries. The most important one is the rolling bearing of the equipment and the two components of the coupling. They are complementary and need to be assembled at the same time. The assembly method is described as follows:
1、 Coupling assembly
1. The coupling is a device that connects the driving shaft and the driven shaft together. It is divided into motor coupling and pump coupling.
2. During installation, the two 200-1 must be concentric and have equal axial clearance between the two ends. Otherwise, it will seriously affect the operation and service life of the machine. Therefore, finding the coupling is an important part of the assembly work. Ring.
3. Requirements for axial clearance of coupling:
A uniform axial clearance shall be maintained between the two couplings. This is to prevent the two couplings from colliding during operation, and the clearance can be checked by feeler gauge, usually 4-6 mm feeler gauge can be used.
4. Couplings with different axial requirements:
The axis of pump shaft and motor shaft shall be in the same straight line. If there is a certain inclination, the machine will run unevenly, produce vibration and noise, cause bearing wear, and affect the service life of the machine.
When two half couplings are installed, due to the same outer circle size of the two half couplings, different axial degrees need to be used, so different axial degrees can be checked through the outer circle.
In this way, check the upper, lower, left and right positions until they are all close together and there is no gap. The different axial degrees of coupling shall not exceed 0.05mm.
The inspection method is to place a ruler on the outer circle of the two half couplings and observe whether the ruler is close to the outer circle of the two couplings.
The two couplings are not concentric because one is firmly fixed and the other has a gap, indicating that adjustment is required.
2、 Assembly method of rolling bearing
1. The assembly of the rolling bearing of the water ring vacuum pump depends on the interference between the rolling bearing and the journal or the bearing hole. When the interference is small, press fit method can be used for assembly. When the interference is large, it can be assembled by hot loading.
2. When the hot filling method is used, the bearing is heated in the oil, the temperature of the oil should be lower than 100, and it should be placed on the journal immediately after being taken out of the oil.
3. When using the press in method for assembly, the inner valve seat can be impacted symmetrically with a copper rod and a hand hammer in a certain order, or the soft metal sleeve can be used to drive or use a hand hammer.
The operation of water ring vacuum pump can not be separated from the help of internal components. Among them, the two very important ones for equipment are rolling bearing and coupling. The two are separable. When disassembling and assembling them, the following steps must be strictly carried out to avoid improper installation.

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