2019年6月18日星期二

Liquid Ring Vacuum Pump Main Application Advantages

1. The working pressure of the liquid ring vacuum pump should meet the requirements of the limit vacuum and working pressure of the vacuum equipment. For example, vacuum coating requires a vacuum of 110-5 mm Hg, and the vacuum of the selected vacuum pump should be at least 510-6 mm Hg. Usually the vacuum degree of the pump is half to one order of magnitude higher than that of the vacuum equipment.

2. Choose the working point of vacuum pump correctly. Each pump has a certain range of working pressure, such as: diffusion pump is 10-3-10-7 mmHg, in such a wide range of pressure, pump speed varies with pressure, its stable working pressure range is 510-4-510-6 mmHg. Therefore, the working point of the pump should be selected in this range, and it can not be allowed to work for a long time under 10-8 mmHg. Another example is that the titanium sublimation pump can work under 10-2 mmHg, but its working pressure should be less than 110-5 mmHg.

3. Vacuum pump should be able to discharge all the gas produced in the process of vacuum equipment under its working pressure.

4. Correct combination of vacuum pumps. Because vacuum pumps have selective pumping, sometimes one pump can not meet the requirements of pumping. It needs several pumps to be combined to complement each other in order to meet the requirements of pumping. For example, the titanium sublimation pump has a high pumping speed for hydrogen, but it can not pump helium, while the tripolar sputtering ion pump (or the bipolar asymmetric cathode sputtering ion pump) has a certain pumping speed for argon. If the two pumps are combined, the vacuum device will get a better vacuum degree. In addition, some vacuum pumps can not work at atmospheric pressure, need pre-vacuum; some vacuum pumps outlet pressure is lower than atmospheric pressure, need the front pump, so they need to be combined to use.


5. Requirements of vacuum equipment for oil pollution. If the equipment is strictly oil-free, all kinds of oil-free pumps should be selected, such as water ring pump, molecular sieve adsorption pump, sputtering ion pump, cryopump and so on. If the requirements are not strict, you can choose to have oil pumps, plus some anti-oil pollution measures, such as adding cold traps, baffles, oil traps, etc., can also meet the requirements of clean vacuum.

6. Understand the composition of the extracted gas. The gas contains no condensable vapor, particulate dust and corrosiveness. When choosing a vacuum pump, it is necessary to know the gas composition and select the appropriate pump for the pumped gas. If the gas contains vapor, particles, and corrosive gases, it should be considered to install auxiliary equipment such as condenser, dust collector in the intake pipeline of the pump.

7. How does the oil vapor discharged from the vacuum pump affect the environment? If the environment is not allowed to be polluted, oil-free vacuum pumps can be selected or oil vapor can be discharged outdoors.

8. Whether the vibration produced by the vacuum pump has an effect on the process and environment. If the process is not allowed, vibration-free pumps should be selected or anti-vibration measures should be taken.

9. Vacuum pump price, operation and maintenance costs.

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Dry Screw Vacuum Pump Performance Characteristics

Dry screw vacuum pump has independent innovation, strong market competitiveness in product quality and price. It can replace imported products in a wide range and has a large market demand. It will replace more than 100 fields such as chemical industry, metallurgy, electronics, petroleum, aerospace, tools, papermaking, packaging, food, medicine, medical equipment, information engineering, bioengineering and microelectronics in an all-round way. At present, vacuum equipment with low technology content.


Dry Screw Vacuum Pump Performance Characteristics:

1. Clean vacuum can be obtained without any medium in the working chamber.

2. The working chamber and the surface of the screw rotor are coated with anticorrosive coating, which can adapt to the harsh working conditions.

3. The gas is not compressed in the pump, so it is suitable to extract condensable gas.

4. A single pump can be pumped from the atmosphere to 1Pa. The vacuum system can be greatly simplified.

5. Water temperature has little effect on vacuum, saving more than 90% water, even without water consumption.

6. No fuel consumption, no drip and leakage

7. There is no friction between rotating parts. It can run at high speed and the whole body is small.

8. The structure is simple and easy to maintain.

9. The pumped gas is directly discharged from the pump body, without polluting the water, without environmental protection pressure, and the gas recovery is more convenient.

10. It can be combined with Roots vacuum pump and molecular pump to form an oil-free unit.


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2019年6月17日星期一

Safety Performance of Water Ring Vacuum Pump

Water ring vacuum pump has a wide range of applications and involves many industries. Some enterprises with complex working environment attach great importance to the safety of equipment. Therefore, in the process of selecting products for application, we should increase the effect of actual use of products, provide reliable safety performance for production, and further enhance the actual development capacity of products. The application performance of the equipment should be enhanced according to the requirements of the enterprise, so as to realize the application ability of the product quickly.

As a high-efficiency and energy-saving water ring vacuum pump, its overall application ability is relatively capable in the whole product. In the process of improving product control, we should provide reliable safety guarantee for the production of enterprises and enhance the optimization of its strength in all aspects according to its product strength and strong product advantages, so as to further expand the reality of its development in all aspects. Strength, with faster product applicability, enhance its overall development advantages, speed up the performance of products in the actual application process.


Whether it is water ring vacuum pump or other application equipment, its safe and reliable performance is the key to improve production efficiency. While making full use of the product, we should base on its actual production experience and constantly develop the product strength to show the application value of the product with higher development advantages.


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Water Ring Vacuum Pump Equipment Knowledge Introduction

Start-up of water ring vacuum pump equipment: Before the long-term stop water ring vacuum pump equipment is started, it is necessary to rotate several times by hand to prove that there is no jam or other damage in the pump. First of all, we should pay attention to opening the exhaust pipe valve, then we should start the motor (pay attention to the positive and reverse of the motor); then, we should gradually increase the water supply until the water supply meet the requirements of the rules (pay attention not to dry running the vacuum pump). Stop of water ring vacuum pump equipment: When water ring vacuum pump equipment is stopped, attention should be paid to closing the valve on the intake pipe (if there is a valve in the intake pipe), and then the water supply pipe should be closed, and the vacuum pump should be shut down quickly; after stopping, attention should be paid to discharging the water in the pump chamber, so as to avoid the blade and pump shaft breaking when starting again. Water ring vacuum pump equipment: When the water ring vacuum pump equipment and the compressor are in operation, the degree of top suction on the surface of the device is concerned, and then, when the device is installed, the bolt device is used to strengthen the hole through the bottom corner. In order to avoid welding slag entering vacuum pump during installation, filter screen should be installed on suction pipe during installation.
About the device of gas-water separator in water ring vacuum pump equipment: The air-water separator can be installed directly on the exhaust port of the vacuum pump, and then it should be fixed with bolts. The air-water separator has a pipeline connected with the pump, thus supplying the working water requirement of the pump. The other working water is supplied by the water supply pipe, and the size of the water supply is regulated by the valve on the pipeline. A backstop valve should be installed on the intake pipe of the vacuum pump or the compressor so as to avoid the water in the vacuum pump or the compressor returning to the system under the pressure of the exhaust pipe when it stops. Maintenance of water ring vacuum pump equipment: When water ring vacuum pump equipment is in use, in order to prevent abrasion of impeller, pump body or blocking impeller, dust particles entering pump chamber with gas and working fluid should be washed out through the flushing port at the bottom of pump. If hard water is used as working fluid, the water ring vacuum pump must be softened or cleaned with solution in a certain period.

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2019年6月14日星期五

Inspection Method for Cylinder of Liquid Ring Vacuum Pump

The liquid ring vacuum pump is a kind of coarse vacuum pump. The maximum vacuum it can obtain is 2000-4000Pa. The vacuum degree of the unit composed of the liquid ring vacuum pump and the vacuum pump can reach 1-600 Pa. The liquid-ring pump can also be used as a compressor, called the liquid-ring compressor. It belongs to the low-pressure compressor, and its pressure range is 1-2*105Pa gauge pressure. Any machine will have some minor faults after a long time of use, so it is necessary to master some solutions.


Inspection method for cylinder of liquid ring vacuum pump:

1. Measure the roundness and cylindricity of the cylinder of the water ring vacuum pump, and determine the boring cylinder or replacement according to its wear degree.

2. Cylindricity and cylindricity of cylinder should comply with relevant regulations.

3. There should be no cracks, sand holes, scars, grooves and other defects on the inner surface of the cylinder. The surface roughness is 1.6.

4. Cracks or leakage are not allowed in cylinder water jacket.

5. The cylinder diameter of the hammer water ring vacuum pump should not increase more than 2% of the original size, and the cylinder wall should not be thinner than 1/12 of the original thickness.

Correct maintenance of the cylinder of the liquid ring vacuum pump will be more conducive to the use of the pump, but also to extend its life. At the same time, when inspecting the cylinder of dry vacuum pump, we should pay attention to all aspects, such as surface, diameter, etc., which need to be inspected.

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Several Points for Attention in Maintenance of Vacuum Pumping Station

1. Because of the high requirement of pump accuracy, it is necessary to test carefully before repairing. It is not necessary to disassemble the pump before repairing, so as to avoid improper repairing and reduce the accuracy. Of course, it is necessary to adjust some parts when their performances become worse or their mating clearance varies.

2. Pump maintenance needs to be done step by step, not hard dismantling or forced dismantling. The disassembled pump parts are required to be sorted and labeled, which can be used when assembling. For example, the maintenance of Lyboa vacuum pump can be carried out according to the sequence of dismantling the motor, coupling, end cover and taking out the spindle first. But no matter what kind of pump is assembled, the parts must be dry and clean.


3. General assembly. After the parts and vacuum chambers are installed separately, try to rotate them to ensure that there is no blocking and tripping phenomenon. After the front cover is installed, the tension bolt can be penetrated from top to bottom, and the seat can be leveled after tension. Adjust the intake pipe of each vacuum chamber to make it on the same plane, then tighten the tension bolt, and try to turn the connecting rod. Its torque should be less than 100 kg?? cm, and there is no serious sense of local blockage. After installing exhaust valve, one-way valve, etc. At this time, the sprocket can be rotated. In this way, the seats have been assembled. Assemble the box part in reverse order when the pump is dismantled. Care should be taken to ensure that no leakage is allowed in the sealing area and oil leakage is not allowed in the oil sealing chamber.

Before the pump test run, put the oil in the vacuum pump station to the central position of the oil-viewing mirror, and then test the pump to observe the effect of the pump.

Turbo-molecular-pump

Large-Flow-Oxygen-Nitrogen-Vacuum-Piston-Pump
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2019年6月13日星期四

Water Ring Vacuum Pump of Selection

I. Determination of Pump Type

The type of pump is mainly determined by the amount of air, vacuum or exhaust pressure required for work.

When the pump works, the following two aspects should be paid attention to:

1. As far as possible, it is required to operate in the high efficiency area, that is, in the critical vacuum or critical exhaust pressure area.

2. Avoid operating near high vacuum or exhaust pressure. Operating in this area, not only the efficiency is very low, but also the work is very unstable, easy to produce vibration and noise. For vacuum pumps with high vacuum, cavitation often occurs when they operate in this area. The obvious sign of this phenomenon is that there is noise and vibration in the pump. Cavitation will cause damage to pump body, impeller and other parts, so that the pump can not work.


According to the above principles, when the vacuum or gas pressure required by the pump is not high, it can be preferentially selected in the single-stage pump. If the vacuum or exhaust pressure is high, the single stage pump often can not meet the requirements, or, in the case of higher vacuum, the pump is required to still have a larger air volume, that is, the performance curve is required to be relatively flat at higher vacuum, two stage pump can be selected. If the vacuum requirement is above -710 mmHg, water ring-air pump or water ring-Roots vacuum unit can be selected as the vacuum pumping device.

If it is only used as a vacuum pump, it is better to choose a single-acting pump. Because the single-acting pump is simple in structure, easy to manufacture and maintain, and has good cavitation resistance in high vacuum.

If it is used only for compressors with larger air volume, it is more appropriate to select double-acting pumps. Because the double-acting pump has large air volume, small volume and light weight, the radial force can be automatically balanced, the shaft is not easy to produce fatigue fracture, and the service life of the pump is longer.

2. Selection of Vacuum Pumps Based on the Gas Volume Required by the System

After preliminary selection of the pump type, for the vacuum pump, the pump type should also be selected according to the volume of air required by the system.

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