Water ring vacuum pump exhaust explosion prevention measures

Probably a lot of people are not familiar with the water ring vacuum pump exhaust explosion phenomenon, which is a harmful phenomenon to the operation of the equipment, so in the use of the process we should try to take measures to prevent.
A, filtering,
In order to solve this phenomenon, the water ring vacuum pump inlet pipe can be installed with a filter device to filter the dust or residual fluid, and regularly clean the filter facilities to ensure good performance of the device. At the same time, the whole water ring vacuum pump pump body maintenance, timely clean the valve plate
Second, the cold yet
As the piston of the water ring vacuum pump reciprocates in the cylinder, the pump temperature is too high, which provides the condition for material carbonization and induces the accident. In order to avoid the occurrence of this situation, before opening the pump to open the water ring vacuum pump cooling system, and to ensure that the system in and out of the pipeline free
Washing and buffering
Adding water washing and buffer tank before the water ring vacuum pump can clean up the residual fluid effectively, and also has a certain cooling effect on the mixed air
However, the following two phenomena often occur in the actual work: when the residual liquid in the tank is small, a small amount of feed liquid will be sucked into the pump body, and the material will be carbonized at high temperature; When the amount of residual liquid is large, such as not timely discharge, water ring vacuum pump may be inhaled liquid, pump flushing, resulting in greater equipment accidents
Therefore, in the production process in strict accordance with the requirements of the use of water ring vacuum pump, timely discharge of residual fluid, to avoid accidents
Iv. Blocked or unblocked exhaust pipe
This fault may lead to the mixed gas containing methanol vapor can not be discharged in time, the accumulation to a certain extent, it will be strong leakage, water ring vacuum pump explosion or even explosion.
The causes of this phenomenon are many, may be due to the design of the lack of depression, resulting in the location of the exhaust pipe is relatively low, there is water or accumulation of oil in the tube, may also be due to some human factors or natural factors, such as the water ring vacuum pump valve is not open or open insufficient, rain cover collapse led to poor exhaust
Although the water ring vacuum pump exhaust explosion can be prevented, but also need to pay special attention to the operation, you can choose some professional strong performance to operate these water ring vacuum pump equipment, in the event of problems can also be dealt with in time.

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Water ring vacuum pump suddenly shut down how to solve

Water ring vacuum pump can be widely used in the vacuum pump, etc., and use more stable, but in the use of equipment may arise suddenly stop running, if rule out conditions is a sudden power outage, so we need to check whether the equipment problems, this is not to the secondary to open, we should deal with the problem and then began to run, let's learn about the equipment suddenly shut down how to solve it.
1, the packing or seal wear, resulting in air leakage into the equipment, then need to check the packing or seal and according to the needs of the corresponding replacement, but also check whether the lubrication is normal.
2. Check whether the inlet pipeline is leaking. It is usually necessary to check the inlet line for air cavitation or air leakage.
3. Sometimes the impeller or pipeline may be blocked. It is necessary to check whether the pipeline is blocked by obstacles. If there is any blockage, it should be dealt with in time. If there is no blockage of the water ring vacuum pump, it needs to be dealt with again.
Water ring vacuum pump suddenly shut down how to solve
4. The immersion depth of the bottom valve or inlet pipe of the equipment is still not enough, so it needs to be immersed to the correct depth to continue normal operation.
5. It may be due to insufficient water absorption when pumping hot or volatile liquids. In this case, it is generally necessary to increase the suction head, if you do not know how to operate, you need to consult with the manufacturer or find a professional to deal with.
6. The suction range is too high, so please check whether the net pressure head is normal in case of this kind of problem. It may be that the inlet line is too small or too long, which will cause wear.

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What is the cause of excessive fuel consumption of roots vacuum pump

Roots vacuum pump may consume too much lubricating oil when it is in operation, so it needs to stop and repair at this time to avoid internal failure that causes great wear and tear on roots vacuum pump equipment and causes more serious consequences.
What is the cause of the excessive fuel consumption of roots vacuum pump equipment
1, the oil spill
Roots vacuum pump oil leakage failure, is generally the main cause of excessive consumption of oil, the need to find out the oil leakage and repair as soon as possible. Need to emphasize is roots vacuum pump oil leakage will lead to the machine and other places have oil, so in the maintenance as far as possible with a special cleaner clean
2. Too much oil in the valve room
Valve tube wear, piston ring and cylinder liner wear, turbocharger seal ring damage, can also lead to the roots vacuum pump excessive consumption
3. The oil temperature is too high
Roots vacuum pump should be shut down for a period of time, check the oil cooler working conditions, change new parts, the oil cooler core clean
4. Excessive oil in the engine
Should remove excess oil, find out the source of oil, engine oil should be appropriate, do not add too much lead to oil leakage
Once it is found that roots vacuum pump consumes too much oil in the operation process, it is necessary to find out the causes of the excessive oil consumption of roots vacuum pump equipment in a timely manner, deal with and solve the problem, and do related maintenance work, so as to better avoid the failure of roots vacuum pump equipment again

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Roots vacuum pump two major rust removal methods

If the maintenance of roots vacuum pump is not in place or the use method is not standardized, the anti-rust effect of the equipment will be reduced. The rusted roots vacuum pump will not only reduce its working efficiency, but also affect the service life of each part. Currently, there are two methods for removing rust of roots vacuum pump:
Artificial rust removal
Artificial derusting cost saving, insurance. You can get rid of rust with the tools you have at your disposal. You can do it by hand. As for insurance, because the roots vacuum pump cavity if the use of chemical rust remover to remove rust, pump cavity more or less will be damaged
Use rust remover to remove rust
Rust remover is very clean but can damage the cavity of roots vacuum pump
Summary, when there is rust corrosion condition, the roots vacuum pump can adopt the method of artificial cleaning or use the rust remover derusting processing, but before to rust removing the roots vacuum pump, be sure to choose according to actual situation of the roots vacuum pump is the rust of rust removal, choose a more suitable method can make the descaling effect better. And in the roots vacuum pump after the completion of rust, also to do the relevant maintenance work, in order to consolidate the maintenance of rust removal effect

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Excitation mode of water ring vacuum pump is introduced

Know people know that the water ring vacuum pump, because the vacuum pump device has the advantages of simple structure, convenient operation for a wide range of applications, if you want to be more successful using water ring vacuum pump equipment, you need to understand its structure, then we have to introduce the knowledge of water ring vacuum pump of the excitation control.
1, the water ring vacuum pump excitation circuit power on the pre-set parameters, including magnetic flux (excitation current) limit value, loss of magnetic protection action setting value, full magnetic current setting value and weak magnetic control curve to check and adjust;
2, water ring vacuum pump potential (or voltage) regulation closed-loop open simulation test. The armature terminal voltage and armature loop current are given in the simulation method, and the output limit value, excitation current and feedback loop parameters of the potential (voltage) regulator are set.
3, water ring vacuum pump excitation current (or magnetic flux) regulation closed-loop control step response dynamic characteristics adjustment. The dynamic characteristics of k should be measured and adjusted in full magnetic working area, near the starting point of weak magnetic field and weak magnetic working area respectively.
The water ring vacuum pump is equipped with an eccentric rotor with fixed blade, which throws water (liquid) to the stator wall, and water (liquid) forms a liquid ring concentric with the stator. The liquid ring and the rotor blade form a rotary vacuum pump with variable volume.
Through the above introduction, we also know that the water ring vacuum pump is now widely used, has a good development prospects, in the use is also to bring you a lot of help. Water ring vacuum pump manufacturers remind everyone, in the use of equipment is must carefully observe the running state of the equipment, once found any problems with water ring pump equipment should be timely solved, to ensure the normal operation of water ring vacuum pump equipment, and will reduce the loss.

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All kinds of vacuum pump descaling and cleaning technology

Vacuum pump is used in many areas, whether in the north or the south, whether the water is soft or hard water, there are scaling problems. When the scale is serious, the hard stone mineral will fill the vacuum pump gap, the motor will not move, until burned out, trip. Every startup is difficult.
The scale of vacuum pump is mainly related to water quality and temperature. The company has been engaged in vacuum pump scale control and descaling research for twenty years. From the beginning, I encountered the problem of vacuum pump scaling in the enterprise, and then worked hard to find a solution, and then promoted it all over the country. Along the way, I accumulated a lot of experience from theory to practice. As a technical salesperson, you don't focus on profit. They don't brag or hack or rely on relationships. By doing, by the study and thinking of the problem.
1. For large vacuum pumps, online scaling control is recommended. Because of the scale of the vacuum pump, the current will be increased by more than 10%. If you put in a very small amount of cost, you can ensure the vacuum pump operation without dirt. It is not that the water ring vacuum pump is nothing like the people who make turbine. The scaling problem of vacuum pump is not a big problem. As long as you seriously deal with it and find a professional company, it is not a problem at all. No incurable disease, because did not find the right medicine.
2. For a small single vacuum pump (for example, under 100KW power), the sealed water cannot be circulated internally. Periodic chelation cleaning is recommended. The so-called chelating cleaning is the use of only calcium and magnesium particles, not iron and copper material reaction of the chemical, in a certain concentration and time, the scale layer reaction. It just slowly enters the water as a particle, without shedding chunks. This medicine doesn't feel anything when you put your finger in it. It won't hurt your hand, and it won't corrodethe device. Don't worry. The price will not be expensive, absolutely in the enterprise think reasonable price.
3. In order to highlight the effect and reduce the cost, many products on the market add hydrochloric acid, nitric acid or sulfuric acid in the descaling agent. These products may seem obvious, but they can be deadly to your device. Any pitted spot or pit is the site of the next scaling. All equipment will not scale at first, only after rough surface, there is a crystal particle adhesion point, will form visible scale deposit. What's more, the bearing sleeve corroded, causing serious losses to the manufacturers, because these people, the mind is money, do not consider the long-term benefits.
In fact, whether large or small vacuum pump, regular safety cleaning is necessary. A clean vacuum pump not only produces the ideal vacuum, but also reduces the load and saves energy.

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How to repair the corrosion of vacuum pump unit

With the development of mechanization, the mechanical performance of vacuum pump unit has experienced the technical improvement and performance improvement from generation to generation. In today's construction activities, the use of vacuum pump unit frequency has been greatly improved. However, due to the special circumstances of different vacuum pump units, there will be some losses are inevitable operational problems. For example, in a corroded vacuum pump unit, since the vacuum pump unit is usually used in a relatively harsh working environment, it is inevitable that there will be corrosion of a vacuum pump unit, and then how to solve it, as we described in the detailed method to repair the corrosion-resistant pump unit:
1. Surface treatment:
The oxide layer is completely removed from the surface and the vacuum pump unit is cleaned with acetone.
2. Harmonic materials:
Harmonize drawing to scale and stir until the surface color of the vacuum pump unit has no color.
3. Application materials:
A thin layer of the repair material should be applied first to ensure complete coverage of the adhesive and no gaps must be left to avoid secondary corrosion. The material is then applied evenly to the surface of the repair to achieve the required thickness.

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The key problem in the design of roots vacuum pump

Roots vacuum pump is a rotary positive displacement vacuum pump, its structure is evolved from roots blower. First appeared in Germany in 1944, it was used as a mechanical booster pump to adapt to vacuum smelting system with high pumping speed in the range of 10-1000pa pressure. In the long-term practice, punnock felt that some key issues must be paid attention to in the design of roots vacuum pump to reflect good applicability and economy, so what are the key issues in the design of roots vacuum pump in Germany?
Compared with other oil-sealed mechanical pumps, roots vacuum pump has the following characteristics:
1. Large pumping speed within a wide range of pressure;
2. The rotor has good geometric symmetry, so the vibration is small and the operation is smooth. There are gaps between the rotor and between the rotor and the shell, no lubrication, small friction loss, can greatly reduce the driving power, so as to achieve a higher speed;
3. No oil seal and lubrication is needed in the pump chamber, which can reduce the pollution of oil vapor to the vacuum system;
4, no compression in the pump chamber, no exhaust valve. The structure is simple, compact and insensitive to dust and water vapor in the pumped gas.
About the roots vacuum pump design key questions, by the technical personnel to answer for you.
One, the key parts of roots pump is the rotor, and the key to the rotor is its shape line. The outer contour of the rotor cross section is the profile of the rotor. Pump work, the surface of the rotor does not contact, but the gap between the rotor to maintain a certain, so the rotor profile must be made into a conjugate curve. When selecting rotor profile in actual design, in addition to meeting the above motion requirements, the following conditions should be considered:
(1) the volume of the pump rotor utilization coefficient to as large as possible, that is, the volume of the rotor accounted for small
(2) the rotor should have good geometric symmetry to ensure smooth operation and good interchangeability
(3) ensure that the rotor has sufficient strength
(4) the rotor should be easy to process and obtain high accuracy
In order to control the clearance between the pump rotor and the pump shell, the axial and radial displacement of the bearing should be controlled within a certain range. In the design, the accuracy of the bearing should be correctly selected and the type of bearing suitable for the working conditions of the pump should be selected. Considering the influence of the rotor axial thermal expansion, the rotor shaft should have a movable end (generally the end of the gear) to allow the shaft to move axially due to the factors such as thermal expansion. The axial clearance between the rotor and the end face of the shaft can be larger. And the axial clearance between the shaft fixed end rotor and the end cover should be selected smaller.
Three, the requirements of the gear wear, smooth transmission, the clearance between the teeth should not be too large. The accuracy of gear is often selected 5~ 6 grade. In order to make the transmission smooth, low noise, commonly used helical gear. In order to make it convenient for gear assembly and rotor clearance adjustment, the gear with adjustable clearance structure can be selected and the connection between the gear and shaft is adopted.
The above is our company after years of practice experience of the roots pump should pay attention to some of the key problems in design, in fact, the applicable conditions of the roots vacuum pump is protean, design can also be varied, even under the working conditions of a unified, also can have different design, but design of applicability and economical efficiency has always been in the design of roots pump should be the pursuit of the goal.

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What is the cause of water ring vacuum pump leakage

Water ring vacuum pump is widely used in food, petroleum, chemical, pharmaceutical, metallurgical industry and electronic fields of vacuum evaporation, filtration, drying, concentration, distillation and vacuum crystallization process. Describe the water ring vacuum pump leakage classification and countermeasures:
1. Water ring vacuum pump in operation is leaking:
At this time, the water ring vacuum pump should be kept at the low and stable speed of zui, and at the same time, water should be added to the cooling system to cool down the engine. After a short time and a slow speed, the water ring vacuum pump should be driven to a nearby shelter for further elimination
2. Water ring vacuum pump shell ruptured and leaked:
According to the situation to replace the relevant parts, troubleshooting
3. Water ring vacuum pump leakage due to serious damage:
If the water ring vacuum pump damage was very severe, on the way and no repair condition, water ring vacuum pump can be directly connected to the inlet and outlet pipe, in order to make full use of the natural circulation of hot and cold water temporarily keep engine normal temperature, or use a tube as a container or bucket, it firmly in place, and then from the container two hose, smokes on the engine inlet, the other one on the outlet of the engine, the other end of the two pipes are inserted into the container, and the hose should be fixed firmly
4. Leakage due to cracks in the shell of water ring vacuum pump:
Will crack processing clean, and then use adhesive repair

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Simply say the vacuum pump filter element maintenance method

The filter element of vacuum pump has three main filtering forms in the operation of the imported vacuum pump. The filter element of vacuum pump is the filter equipment in the vacuum pump and an important working part of the filter. The filter effect is mainly determined by the performance of the filter element. In cleaning and replacement, there are a lot of people do not make a point, often wasted effort, but did not receive better results. The following contents of the import vacuum pump manufacturers for your simple vacuum pump filter maintenance method.
1. Oil filter core (used for filtering lubricating oil of imported vacuum pump to extend the service life of oil)
2. Air inlet filter element (can effectively prevent solid particles and fine ash from being sucked into the vacuum pump. Reduce mechanical wear and improve reliability of operation. It can extend the service life of the pump and protect the system components effectively.
Three, exhaust filter core (take into account exhaust resistance, dust capacity, oil and gas separation performance, the three requirements to achieve an optimal balance. Different materials are used in different internal and external positions to achieve different separation purposes.
Usage and maintenance:
First, carefully remove the spring and felt pads, and then take out the paper core.
Loosen the knob bolt to separate the filter housing from the head. Be careful not to lose the rubber seal ring and the fiber washer.
3. Use a brush to remove dust and foreign matters in the creases of the filter core, and then gently pat it flat to make the remaining dust fall, and wipe off the dust on the inner wall of the shell and the dust on the fiber mat.

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The wiring procedure of vacuum pump is introduced

After the completion of vacuum pump processing and production, it is necessary to wire the vacuum pump before the first use, which is an important work. The wiring quality will directly affect the performance of the vacuum pump. Therefore, the vacuum pump manufacturer introduced the following wiring steps.
1. When wrapping with polyester insulating tape, one half of the first circle must be pressed and wrapped in 8-12 layers. After the vacuum pump is wrapped, two layers of plastic tape should be wrapped for strength.
2. Strip the cable copper core about 30 -- 35mm long, wipe the copper wire with emery cloth, shine preferably, also strip the copper wire of the external three-core cable 30 -- 35mm, and wipe it with emery cloth.
3. Insert the copper wire stripped from the three-core cable and the external cable into each other, then tie tightly with a thin copper wire according to the figure, cut off the remaining part, and press flat with scissors to avoid sticking hands.
4. The three wire ends shall be soldered firmly with tin respectively. The surface of the welding head shall be smooth without burr and false welding.
5. After dressing, take a basin of cold water and soak the wrapped thread in water safely. After 12 hours, measure the insulation with 500V megohm meter and the insulation shall not be lower than 50megohm.
We must be careful when wiring the vacuum pump to avoid other faults, after the wiring is completed, to check it, for unqualified places, should be timely correction, so as to avoid the use of danger.

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Solution to water inlet of dry screw vacuum pump

When we use the dry screw vacuum pump, due to the operation error, will lead to the screw vacuum pump water, for this situation, we should generally solve:
Solution to water inlet of dry screw vacuum pump
1, if the dry screw vacuum pump into the water is not much and within 2 liters, stop the pump, open the oil drain valve, put the water out, then open the gas shock valve for 1 hour;
If the dry screw vacuum pump into a large amount of water, dry oil, and then add new oil, and then gas shock valve for 1 hour;
If necessary, a receiver can be installed between the treatment room of the dry screw vacuum pump and the roots vacuum pump, so that the liquid can be absorbed before entering the screw vacuum pump
2. Check the oil seal ring of the pump shaft, and replace it with a new one if the wear is serious;
Screw vacuum pump pipeline leakage or air leakage, may be installed when the nut is not tightly screwed;
If the leakage is not serious, can be in the leakage or leakage of the place daub cement, or coated with asphalt oil mixing cement slurry

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Why do water ring vacuum pumps add check valves

To introduce a water ring vacuum pump knowledge, is why to add a check valve. As follows:
The check valve is a one-way valve. When the pump stops, the vacuum of the vacuum tube is higher than the pump chamber. The gas will enter the pump chamber from the exhaust port, and the water pressure will be transferred to the vacuum tube. Water ring vacuum pump installed check valve, mainly for protection:
1. Protection system. When the pump stops, the inlet of the vacuum pump and the connection of the system are in a vacuum state. Check valves are usually installed at the pump inlet and system connection for protection.
2, to protect the vacuum pump itself, gas backflow will impact the impeller, make the pump reverse rotation, in order to protect the pump body and other equipment, generally installed in the pump outlet check valve. More and more units now install check valves to the outlet to protect the pump and the system. If the system requirements are strict, there are two additional check valves. The check valve ACTS as a check. Due to the vacuum pump after closed the containers in a vacuum state, and the vacuum pump chamber as big as the environment pressure, because of the pressure difference, when we close the vacuum pump, vacuum pump air could be back is pumped container, if we check valve in the pipeline installation, in close vacuum pump before closing the check valve, pump chamber air wouldn't fall back to be smoked container. When the pump stops, the outlet pressure is greater than the inlet pressure. In order to prevent the water in the water ring pump from being pressed back into the vacuum system, check valves are added to the inlet. Also called check valve or one-way valve.

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Details of vacuum pump maintenance

All the details of vacuum pump maintenance in this paper is organized by professional vacuum pump maintenance company, hope to help you. Vacuum pump is a kind of rotary variable volume gas delivery pump, including dry screw vacuum pump, water ring pump, reciprocating pump, slide valve pump, rotary plate pump, roots pump and diffusion pump, with a wide range of pressure within the larger pumping speed, is widely used in metallurgy, chemical industry, food, electronic coating and other industries. The quality of vacuum pump depends on its mechanical structure and the quality of oil. If the distillation of volatile organic solvents, organic solvents will be absorbed by the oil, increasing the vapor pressure, thus reducing the efficiency of pumping, if it is acidic gas, it will corrode the oil pump, if it is steam will make the oil into emulsion and pump vacuum.
Vacuum pump maintenance
Therefore, vacuum pump maintenance manufacturers remind the use of vacuum pump must pay attention to the following points of vacuum pump maintenance details:
1. An absorption device must be installed between the distillation system and the vacuum pump.
2. Before distillation, a water pump must be used to completely remove the steam of organic solvents from the system.
3. If you can take out air with a pump, try to use a pump, such as distillation substances containing volatile substances, can first use a pump pressure pumping down, and then switch to oil pump.
4. The pressure relief system must be airtight, all rubber plugs should be the right size and hole, and rubber tubes should be vacuum rubber tubes. The ground glass is coated with vacuum grease.
Suggestions on the repair and maintenance of vacuum pump:
1. Vacuum equipment should be installed in a clean and clean environment, not suitable for debris, dust, water, and areas with high temperature.
2. When the vacuum pump is installed for the first time, check whether the motor is turning forward, that is, the motor is consistent with the rotor turning inside the pump. Generally, the upper part of the motor is marked with the normal running direction of the motor.
3. The vacuum pump should be started several times intermittently before long shutdown.
4. When the vacuum pump is out of service for a long time, oil discharge should be carried out on the vacuum pump.
5. When the vacuum pump is running, the oil temperature should not be higher than 75 degrees. If the oil temperature is too high due to fault, please timely contact the vacuum pump manufacturer for maintenance.
6. If the vacuum pump has potential hazards such as inhaling impurities, dust, water and chemical substances, precision filters should be installed at the air inlet of the vacuum pump. If the impurities, dust and water are too large, a piggy bank should be installed for filtration to prevent impurities such as dust and water chemicals from entering the vacuum pump.
7. If the vacuum pump needs to operate 24 hours, it must be maintained every six months.
8. During the normal operation of the vacuum pump, the oil of the vacuum pump in the pump should not be lower than the oil mark line, and the oil mirror should be 2/3. When refueling, it is strictly forbidden to mix with different brands and models of vacuum pump oil.
9. Vacuum pump oil shall be replaced regularly, generally once every 3-6 months. If emulsification and carbonization of pump oil are found, special oil for vacuum pump shall be replaced in time.

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Analysis on the cause of tripping of dry vacuum pum

The reason of active tripping of dry vacuum pump was analyzed. A dry vacuum pump is a device or machine that USES mechanical, physical, organic, chemical or physical means to vacuum a pumping vessel in order to obtain a vacuum pump. In short, dry vacuum pumps are machines that use various methods to improve, create, and maintain vacuum pumps in enclosed Spaces. For example, a dry vacuum pump experiences a trip.
The main reason should be to grasp the tripping situation, and then solve the small problem of dry vacuum pump tripping, and then solve the small problem of tripping. The dry vacuum pump manufacturer explained why the dry vacuum pump tripped. Dry vacuum pumps have been used for a long time. If the dry vacuum pump is stopped for too long, the motor load will cause the transient current to be too high. Close dry vacuum pump. Air inlet is used for heat pump housing.
Motor load. Dry vacuum pump motor load, when the current is too high, such as the electric flow set on the electrical control cabinet, dry vacuum pump will automatically trip and release, dry vacuum pump wholesale remind dry vacuum pump is normal this time. Condition, adjustable current maintenance limit to solve tripping situation, dry vacuum pump outlet suction dirt or debris, motor load, detachable dry vacuum pump check whether there is a small problem.
The dry vacuum pump motor is connected to a two-phase switching power supply. The three-phase power supply is not connected. The three-phase power supply of dry vacuum pump can be connected. If the trip is repeated for 10 hours, adjustments will still be made. Current flow limits can only be used to balance supply and demand for raw materials and electrical and mechanical engineering manufacturers.

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Water ring vacuum pump needs careful maintenance

All the equipment needs regular maintenance, which can not only ensure the normal operation of the equipment, but also effectively extend the service time of the equipment.
Periodic maintenance of water ring vacuum pump:
(1) in normal work should pay attention to check the working and lubrication of the bearing, its temperature (bearing and outer circle) is generally higher than the ambient temperature of 15℃ ~ 20℃ is appropriate, the highest is not allowed to exceed 30℃ ~ 35℃, that is, the actual temperature of the outer circle of the bearing frame should not exceed 55℃ ~ 60℃; Normally working bearings should be lubricated 3 to 4 times a year, at least once a year to clean the bearing, and all the lubricating oil replacement.
(2) during normal operation, the packing shall be pressed regularly. If the required sealing performance of the packing cannot be guaranteed due to wear, a new packing shall be replaced. If mechanical seal is used and leakage is found, check whether the rotor and rotor ring of mechanical seal is damaged or the auxiliary seal is aged. If the above situation occurs, new parts need to be replaced.
(3) in case of special sound, the pressure plate on the two end covers can be removed to check whether the two end faces of the impeller are crushed with the distributor and whether the exhaust valve plate is normal.
The quality of water ring vacuum pump depends on its mechanical structure and the quality of oil. If the distillation of volatile organic solvents, organic solvents will be absorbed by the oil, increasing the vapor pressure, thus reducing the efficiency of pumping, if it is acidic gas, it will corrode the oil pump, if it is steam will make the oil into emulsion and pump vacuum.
Therefore, the use of vacuum pump must pay attention to the following points:
An absorption device must be installed between the distillation system and the vacuum pump.
Before distillation, the organic solvents in the system must be completely removed by a pump.
If can use water pump to take out air, use water pump as far as possible, if the volatile substance is contained in distillation material, can use water pump to reduce pressure to take out first, convert oil pump next.
The pressure relief system must be airtight, all plugs must be the right size and hole, and the rubber tube must be vacuum rubber tube. The ground glass is coated with vacuum grease.
Vacuum pumps can be divided into three categories according to the range of use and pumping efficiency:
(1) for general pumps, the pressure can reach 1.333~100kPa(10~760mmHg) for "coarse" vacuum.
(2) the oil pump, pressure up to 0.133~ 133.3pa (0.001~1mmHg) is the "second-highest" vacuum.
(3) diffusion pump, pressure up to 0.133pa below, (10-3mmhg) for "high" vacuum.
For a lower pressure, the pump is needed, and a good pump can pump below 133.3pa (1mmHg).
In the organic chemistry laboratory commonly used vacuum pump pump and vacuum pump two kinds, if not very low pressure requirements, available pump, if the pump is well constructed and high water pressure, pumping efficiency up to 1067~3333Pa(8~25mmHg). The minimum pressure a pump can pump is theoretically equivalent to the pressure of water vapor at the current temperature. For example, when the water temperature is 25℃, 20℃ and 10℃, the pressure of steam is 3192, 2394 and 1197Pa(8-25mmhg), respectively. When pumping air with a water pump, a safety bottle should be installed in front of the pump to prevent the water pressure from falling and the water flowing backwards. Before stop pumping air, first vent air and then turn off the water pump.

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Water ring vacuum pump cast iron cracks how to repair?

Water ring vacuum pumps were originally used as self-priming pumps. It is composed of impeller, pump body, intake and exhaust disc, water ring formed in the wall of the pump body, suction port, exhaust port, auxiliary exhaust valve and so on. Water ring pump is widely used in many industrial processes, such as vacuum filtration, vacuum water diversion, vacuum feeding, vacuum evaporation, vacuum concentration, vacuum moisture return and vacuum degassing. Due to the rapid development of vacuum application technology, water ring pump has been paid more attention to the crude vacuum acquisition. Because the gas compression in the water ring pump is isothermal, it can be removed flammable, explosive gas, in addition can also be removed dust, water gas, therefore, water ring pump application is increasing. Water ring vacuum pump cast iron cracks how to repair?
The mechanical properties of cast iron parts of water ring vacuum pump are poor. The location and size of the crack must be found out before repair. For non - obvious crack defects, kerosene test is often used to identify a simple method.
First, an aqueous solution of chalk was applied to one side of the suspect area, and when dry, kerosene was applied to the other side. Because kerosene has the ability to penetrate fine cracks, when the parts have a small very not obvious crack, kerosene can penetrate the past, infiltrate the white powder and make it discolored. Therefore, according to whether the chalk is discolored, and the shape and size of the discolored chalk, it is possible to determine whether there is a defect, as well as the shape and position of the defect. The cracks can be repaired by general welding method and epoxy resin bonding method.

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A convenient way to reduce the noise of rotary vacuum pump

How to reduce the noise of rotary vacuum pump? The following three vibration isolation methods are Shared by vacuum pump technicians:
1. Rubber vibration isolator:
Choice of rubber vibration isolator: materials are generally chloroprene rubber (C.R), natural rubber (N.R); Generally choose compression type rubber shock absorber, for the weight of light vacuum pump, can choose shear type rubber shock absorber; Compared with spring shock absorber, rubber shock absorber vibration isolation performance is relatively different.
Ii. Add sui base:
In order to meet the more strict vibration system standard, it is undoubtedly the best choice to use the spring isolator when installing the inert base. Specification of inert base: the weight of base is more than 1-2 times the weight of vacuum pump. The frame is made of locked slot iron, the height of which is not less than 1/12 of the length, but not less than 150MM, not more than 300MM; The dimension of length and width should be able to cover the whole rotary vane vacuum pump, and it is advisable to leave 10-15 cm on each side. And it is better to include bay head as well; It is filled with cement with a layer of steel mesh at one third of the height. Install spring isolator to distance the base from the foundation to 3-5 cm.
3. Spring vibration isolator:
1, vacuum pump spring vibration isolator selection:
General choice of free-standing spring shock absorber, its advantages of simple structure, low cost; The spring is exposed to the outside, which is convenient to observe the state of the spring at any time. The spring that needs to be replaced should be disposed in advance, so as to avoid the appearance of equipment damage and pipeline rupture caused by the sudden deposition of the rotary vane vacuum pump when the spring is corroded excessively.
2. Spring selection:
General shock absorber manufacturers to choose the spring to meet the following requirements: the spring diameter should not be less than 0.8 times the height under the rated load; The spring shall have a certain additional stroke, and the vortex flow meter shall be equal to at least 50% of the rated static deflection; The horizontal stiffness of the spring is at least 100% of the rigidity of the stiffened steel to ensure the stability of the shock absorber.
3, spring shock absorber deflection selection:
In general, the rated deflection (spring rated compression) of the shock absorber proposed by the vibration absorber manufacturer is generally 25MM(self-frequency value is about 3-4hz), which can be used for vibration isolation of the vacuum pump at 650 revolutions per minute. When the speed is below 650, it is recommended to use a spring isolator with a deflection below 40.

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