Matters needing attention in the installation of vacuum system

After the design and selection of the vacuum system equipment, it finally entered the installation stage. Although there are layers of leak detection and other work checks, but still need to do some preparatory work and precautions in this link 

Before the installation of vacuum pump and vacuum system, all kinds of parts should be cleaned to remove the impurities such as oil, dirt, welding flux, etc. during the processing and storage of the parts, so as to prevent the formation of air source inside the vacuum system after the installation. The common method is to use decontamination powder and wash with hot water, and finally blow dry with hot air and wipe with organic solvent.

The second is the leak detection of parts before the device. In front of the device, the leakage of the local parts of the vacuum pump and the air system shall be checked, and the parts with leakage holes shall be removed in time to prevent the parts with leakage holes from being assembled on the vacuum system, which will bring unnecessary trouble for the later debugging.

Third, check whether the performance of vacuum valve and other components can meet the design requirements.

Fourth, according to the electrical diagram, check whether the circuit is in good condition, whether the switch can point to the open circuit position, whether the relevant test instrument can be in the zero position, whether the ground wire can be grounded, whether the operation is safe, etc.

Fifth, leak detection in the process of vacuum system installation. The leak detection of vacuum system in the process of device debugging is the main part of vacuum leak detection. Therefore, the device process must be separated from leak detection. If multiple vacuum pumps are installed in series on site, the mechanical pump should be installed and pumped first, and then the main pump should be installed after reaching the vacuum degree, instead of stopping leak detection after all the installation of the system is completed. Otherwise, once there is air leakage, it will bring trouble to the device. At the same time, pay attention to whether there are scratches on the rubber ring and flange sealing surface at the static sealing flange to prevent air leakage after installation. After the vacuum system device is completed, the no-load commissioning and the commissioning in the process of process consumption will be stopped.


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Model of stainless steel vacuum pump

Stainless steel vacuum pump is widely used in our life, and the vacuum pump materials on the market are also various. What materials are suitable for our use? The classification of different application environments is also very different. Let's briefly understand the main classifications.

2BV water ring vacuum pump is suitable for continuous operation to form a vacuum and to remove dry and wet gases, mainly non flammable, non corrosive atmosphere and atmosphere / steam mixture. According to the requirements of customers, we can provide vacuum pumps suitable for flammable, explosive and toxic media.

In this case, users should take corresponding safety measures. The working fluid is usually water. 2BV vacuum pump is suitable for the occasions with more stringent requirements on corrosion prevention and sanitation. 2BV vacuum pump is used in the range of coarse vacuum; the limit vacuum is determined by the saturated vapor pressure of working fluid.

2SK series two-stage water ring vacuum pump is characterized by high vacuum degree and large pumping speed in high vacuum area; compact structure and convenient maintenance; wide application range, it can pump various gases containing water vapor, inflammable, explosive, a small amount of dust and a small amount of liquid; main water is used as working medium, with low maintenance cost; it can work in a relatively harsh environment.

It is suitable for working conditions with suction pressure lower than - 0.08mpa. 2sk-p1 series is suitable for working conditions with suction pressure lower than - 0.096mpa. When equipped with air pump, the limit vacuum degree can reach - 750mmhg. The working vacuum range is -0.03-0.08mpa.

Water Ring Vacuum Pump

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Cavitation mechanism and prevention of liquid ring vacuum pump in brick and tile enterprises

In the production process of sintered brick slurry, in order to promote the molding performance, uniform density and strength of slurry, make some low plasticity and inferior raw materials lose full use, and make common slurry produce thin-walled and high-strength hollow brick, usually vacuum pump is used to pump out the continuous true void of slurry, so that the vacuum degree of slurry greatly reduces the air content outside the slurry to meet the production requirements, making it lose one A decent body.

There are many kinds of vacuum pumps used in brick and tile enterprises. Liquid ring vacuum pump is a kind of rare equipment in vacuum extractor. The vacuum pump operates in high vacuum state, especially in winter, with the increase of operating liquid temperature, the liquid gasification pressure also increases. At the suction end of the vacuum pump, the bubbles in the liquid ring condense rapidly and cause the bubbles to break, which is the mechanism of cavitation in the vacuum pump. The cavitation of vacuum pump has nothing to do with the vacuum degree and working liquid temperature of vacuum pump, and nothing to do with the development of vacuum pipeline and compression ratio. In this case, any vacuum pump will produce cavitation, so no matter how large the structure and compression ratio of the vacuum pump, the opposite vacuum will be formed on the suction side of the vacuum pump, thus cavitation will be generated.

In the operation process of vacuum pump, it is necessary to work as efficiently as possible, that is, in the sea area with critical vacuum degree or critical exhaust pressure, it is necessary to prevent the operation close to the maximum vacuum degree or maximum exhaust pressure. In this sea area, not only the efficiency is very low, but also the operation is very balanced and solid, which is easy to produce vibration and noise. For the vacuum pump with high vacuum degree, cavitation will occur when it is operated in this sea area. The obvious signs of this phenomenon are noise and vibration in the pump. Cavitation will cause mechanical damage such as pump body and impeller, resulting in the pump helpless operation.

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Vacuum pumps in the industrial sector

Vacuum pumps in the industrial sector

Vacuum pumps are widely used in industrial sectors, such as light bulb manufacturing, electronic tubes, food packaging, and semiconductor device manufacturing. Vacuum distillation, vacuum impregnation, ion nitriding, vacuum drying, vacuum carburizing, vacuum quenching, vacuum casting, etc. Under vacuum conditions, due to the small number of gas molecules, the harmful effects of gas can be avoided.

For example, heat treatment in vacuum can prevent oxidation and gas from penetrating into the metallographic structure, thereby improving the quality of parts; maintaining high vacuum in electronic devices can avoid the impact of electronic movement; maintaining high vacuum in vacuum packaging can improve the shelf life of food. In modern cutting-edge science and technology, vacuum technology is an indispensable means, such as high-energy accelerators, controlled thermonuclear reactions, universe simulation and other projects all require high vacuum or ultra-high vacuum technology.

There are many types of vacuum pumps, including mechanical vacuum pumps (such as reciprocating vacuum pumps, oil-sealed mechanical vacuum pumps, roots vacuum pumps, turbo molecular pumps, water ring vacuum pumps, etc.), jet vacuum pumps (such as water vapor jet pumps, water jet pumps, atmospheric jet pumps, Oil booster pumps, oil diffusion pumps, etc.), as well as physicochemical adsorption pumps (such as titanium pumps, molecular sieve adsorption pumps, cryogenic pumps, etc.). Mechanical vacuum pumps are mainly used in the machinery industry sector, and other types of pumps are less commonly used.


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Cautions for Operation of Vacuum Pump System

What should we pay attention to when using the vacuum pump system? Today we will introduce this knowledge to you, hoping that through our introduction we can better help you understand.

Before the vacuum pump system is put into operation, it is necessary to carefully check whether the fasteners in various parts are loosened or not, and if loosening occurs, the tightening must be corrected. Before starting, the water tank must be filled with water, open the inlet valve of the pump, and then run the anti-corrosion pump. It is strictly prohibited that the pump is dehydrated, idle and reversed to prevent damage to the seal, impeller and other parts of the pump body. Before the vacuum unit stops, it opens the vent valve or reduces the vacuum to less than 0.092 MPa before stopping. In order to prevent backdraft damage to check valve caused by excessive vacuum. If the check valve fails, please open the check valve cover and remove debris.

When using steam-water series jet vacuum unit, the steam valve should be opened before starting. When stopping, the steam valve should be turned off before stopping, so as to prevent damage to the water jet vacuum pump caused by excessive temperature. When installing steam pipeline in vacuum unit, the pipeline must be kept level to prevent water accumulation in the pipeline, otherwise the vacuum effect will be affected. The circulating water in the water tank should be replaced or supplemented frequently, and the lower water temperature should be kept as far as possible, because excessive water temperature will affect the exhaust volume and vacuum degree.

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Small vacuum pump

1. Start-up with load.

If a small vacuum pump has a vacuum in its suction port or a pressure in its exhaust port before starting, another technical parameter of the pump should be considered: the maximum start-up load of the intake port and the maximum start-up load of the exhaust port.

2. Medium temperature of small vacuum pump. According to the temperature of the medium gas passing through the pump, choose the ordinary type or the high temperature type.

3. Reliability of small vacuum pumps. According to the severity of the consequences of the failure of the micro-pump, it is completely in accordance with its own requirements. Special attention is paid to the fact that this parameter is measured under full load and uninterrupted operation, which is the worst working condition. If the actual operation is not full load or continuous operation, the value will be higher, depending on the working condition of the pump. This performance is a test of the manufacturer's technical strength. From the appearance of the product, we can see some, such as the use of special motors rather than ordinary low-cost motors, the weight is relatively heavy in the case of comparable volume, and so on. According to the price of the product, we can also know a little.

4. Electromagnetic interference of small vacuum pump. If a small vacuum pump is controlled by a precise circuit, it may be necessary to order a small vacuum pump with low electromagnetic interference, depending on the anti-interference capability of the circuit.

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