Component structure of oil free vacuum system

In recent years, it has been found that the performance and technical index of many electronic devices are seriously affected by the return of oil vapor from mechanical vacuum pump and diffusion pump into the evacuated vessel or device. For example, the oxide cathode of electronic tube reduces its emission performance and service life due to oil vapor; various high-power and high-voltage electronic tubes are easy to be broken through due to the presence of oil vapor; the high-voltage vacuum capacitors used in radio stations, due to the presence of poised steam, significantly reduce their withstand voltage index, and oil vapor has a significant adverse effect in many places. Therefore, the vacuum system used in these aspects should be replaced by an oil-free vacuum system, that is, instead of using vacuum oil sealing and vacuum oil as the working fluid (such as mechanical pump and diffusion pump), the vacuum system can be obtained by adsorption of gas molecules and reducing the pressure in the container. 

The adsorption pump uses the porous surface of some solid materials to strongly adsorb the gas in the cold state, so that the closed system can obtain a low vacuum of 10-2 mm mercury column. It is used as the front stage of oil-free system.

In addition to activated carbon, most of the adsorbents used in the adsorption pump use molecular sieve (artificial zeolite) to adsorb gas and obtain vacuum. Because, after cooling with liquid nitrogen, each kilogram of molecular sieve can pump a 50-100 liter container from the atmosphere into a vacuum of 10-2 mm mercury column. Therefore, it is a pump with large suction. After baking at about 400 ℃, the gas it absorbs will be released again (called activation or regeneration) to restore the ability of reabsorbing. At present, the commonly used 5A molecular sieves (with large absorption capacity, suitable for exhaust air, but often "activated", with an average pore diameter of about 5 angstroms) and 13X molecular sieves (although their adsorption capacity is smaller than 5A molecular sieves, they can absorb oil vapor molecules).

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Working principle of circulating water cooling device for vacuum pump unit

What is the working principle of circulating water cooling device of vacuum pump unit? Let's have a brief understanding. Pump the water in the storage tank into the water sprayer, and pump the water to the cooling water inlet of the unit 

Under the action of exhaust fan, the water evaporates on the surface, dissipates heat and cools down, and then returns to the water storage tank. The distribution of the holes on the porous plate determines the position of the water column, so that the small holes on the porous plate are evenly distributed, so that the air flow can fully contact the water column and form the surface of swallow hair as large as possible Achieve the purpose of water cooling

Considering that the water discharged from the vacuum unit is far away from the air and the temperature difference between it and the air is relatively large, the first stage of forced cooling with air cooling is designed. The water discharged from the vacuum unit passes through the radiator first, and the radiator is placed behind the fan, and then the cool air passing through the water is blown to the radiator, so that the hot water discharged from the diffusion pump is cooled, and then returned to the water storage tank. The cooling water flow in the diffusion pump can be controlled It was observed directly in the device.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

Causes of seal damage of multistage vacuum pump

There are two kinds of reasons for the seal damage of multistage vacuum pump: artificial damage and natural damage. The seal of multistage vacuum pump will be damaged by scratch, bruise and squeeze when it is opened and closed. Mechanical damage between two sealing surfaces. Under the action of high temperature and high pressure, atoms permeate each other and cause adhesion. When the two sealing surfaces move with each other, the adhesion is easily pulled and torn. The higher the surface roughness of the sealing surface of the multi-stage vacuum pump, the more easily this phenomenon occurs. 

When the medium is active, the sealing surface of multi-stage vacuum pump is worn, washed and cavitated. The floating fine particles in the medium collide with and offend the sealing surface, causing local damage. The high-speed moving medium directly washes the sealing surface, causing local damage. When the medium is mixed and vaporized locally, the gas generating bubble blasting impacts the sealing surface, causing local damage. Medium erosion and chemical erosion alternate action, will strongly erode the sealing surface.

The potential difference and electrochemical corrosion will occur due to the contact between sealing surfaces, the contact between sealing surfaces and sealing body and valve body, as well as the concentration difference of medium and oxygen concentration, which will lead to the corrosion of sealing surface on the anode side. However, in the case of no current generated by the medium near the sealing surface, the medium directly reacts with the sealing surface, forming chemical erosion and eroding the sealing surface.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

horizontal centrifugal pump application

1. Pipeline centrifugal vacuum pump is used to transport clean water and other liquids similar to clean water in physical and chemical properties. It is suitable for industrial and urban water supply and drainage, high-rise building pressure water supply, garden irrigation, pressure fire protection and supporting equipment. 

2. Hot water circulating pump (high temperature) is widely used in energy, metallurgy, chemical industry, textile, paper, hotel and other boilers. The service temperature of iswr is less than or equal to 120 ℃ and the service temperature of WRG is less than or equal to 240 ℃.

3. Horizontal chemical pump is used for conveying liquid with no solid particles, corrosive and viscosity similar to water. It is suitable for petroleum, chemical industry, metallurgy, electric power, papermaking, food, pharmaceutical and synthetic fiber industries. The operating temperature is t: - 20 ℃ to 120 ℃.

4. Horizontal oil pump is used to transport gasoline, diesel oil, kerosene and other petroleum products. The operating temperature is t: 20 ℃ to 120 ℃.

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Exhaust pressure of Roots vacuum pump

When roots vacuum pump is working, air will be continuously discharged from the pump body to form the required vacuum degree at the suction port, that is to say, the exhaust pressure is another main factor affecting the operating efficiency of water ring roots vacuum pump.

The exhaust pressure has a great influence on the suction capacity and shaft power consumption of Roots vacuum pump. When roots vacuum pump system is running, if the exhaust pressure is higher, the suction capacity of Roots vacuum pump will be smaller, and the power consumption of corresponding shaft will be greater. On the contrary, when the exhaust pressure of the system is smaller, the suction capacity of Roots vacuum pump will be greater, and the power consumption of corresponding shaft will be smaller.

Therefore, in the actual operation and maintenance process, the exhaust pressure data of Roots vacuum pump system should be observed in real time. When the abnormal exhaust pressure data appears, corresponding measures should be taken immediately to update the whole vacuum system, so as to maintain the exhaust pressure of the vacuum system within the standard range for a long time, and ensure that roots vacuum pump is always in excellent working conditions, and effectively improve the performance of the system High mechanical efficiency of Roots vacuum pump.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

How to clean roots blower correctly

Roots blower is a volume rotary blower, the biggest characteristic is that when the pressure is adjusted within the allowable range, the flow rate is almost unchanged, the pressure selection range is wide, and it has the characteristics of providing forced gas. The medium should be free of oil. Simple structure, easy maintenance, long service life and small vibration. 

Roots blower is a kind of positive displacement blower, which can be used as vacuum auxiliary for suction. The two rotors rotate in the opposite direction to compress or remove gas. Both rotors are fixed on the synchronous gear set, so there is a small gap between the cylinder and the rotor during rotation, and they can not be contacted with each other.

When cleaning roots blower, we should pay attention to three requirements. The best way to prevent faults in Roots blower cleaning is to take correct cleaning method and clean the equipment regularly. Every day to do a good job of Roots blower maintenance work, reduce roots blower failure.

Care must be taken in cleaning roots blower motors. Be careful not to let oil drop into the motor. About the cleaning of the motor, clean it with a dry cleaning brush. Clean the outside and inside of the equipment with dry cloth. Keep the equipment dry enough to avoid moisture. The interior of Roots blower can not be wiped with wet cloth. If the water drops on the equipment, it will affect the use. Therefore, it is best to wipe the interior of the device with a clean cotton cloth. After cleaning roots blower equipment, wipe the external and internal parts of the equipment with dry rag to fully keep the equipment dry and prevent the equipment from expired.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

Debugging method of rotary fan

After the rotary fan is installed in place, first remove the air inlet filter and pour about 30ml oil into the main engine to make the engine oil evenly distributed in the main engine. Rotate the main pulley by hand to make the engine oil evenly lubricate the inner wall of the fan.

Before starting the rotary fan, please confirm whether the V-belt is loose properly. If it is too loose, please adjust it. Make sure that the relief valve is set at the specified pressure position. During commissioning, the exhaust valve can be adjusted manually to increase the opening pressure, adjust the safety valve and open it immediately. Before starting the rotary fan, the sewage treatment tank must be filled with water before the rotary fan can be operated. Otherwise, if there is no pressure at the outlet of the rotary fan, the rotary fan will not be lubricated. Turn on the power fan and confirm that the rotation direction of the rotary fan is consistent with the rotation mark direction. In case of inconsistency, disconnect the power supply immediately and adjust the motor wiring.

Observe whether there is pressure indication on the pressure gauge, observe the oil dripping from the nozzle, observe whether there is oil flow in the transparent oil return pipe, check whether all parts of the motor and fan work normally, whether the temperature is normal, and whether there is abnormal sound.

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