Roots vacuum pump operation

Roots vacuum pump operation and maintenance problems

1.Start the Roots vacuum pump and prohibit the outlet overpressure during the operation of the pump. If the outlet is over-pressurized when the pump is started, the light motor will trip and the pump will not start. The heavy one may damage the equipment; during the operation, the outlet is over-pressurized, the load of the pump increases, and the motor trips in severe cases.

2.Start or switch the Roots pump when the vacuum is at a minimum. That is, when the two towers are switched and evacuated, the Roots pump is started or switched. At this time, the pump inlet pressure is the highest, the pump outlet pressure is close to the pump, and the starting load is minimum. In an emergency, the pump should be prevented from starting and switching at a high vacuum.

3.When starting, close the inlet valve and open the inlet valve quickly after starting. According to the design requirements of the Roots vacuum pump, the pump inlet and outlet valves need to be fully opened before the pump is opened. However, in actual operation, it is difficult to ensure the tightness of the outlet check valve. If the inlet and outlet valves are fully opened, the pump will be reversed. At this time, the pump is started. It can't start because of the large starting load. According to the actual situation, the pump outlet valve is fully opened, and the inlet valve is slightly opened to ensure that the pump does not reverse. After starting the motor, the inlet valve is quickly opened.Rotary Vane Vacuum Pump

4.According to the Roots vacuum pump body temperature and outlet temperature to determine the operating state of the pump. Because the noise of the Roots pump is large, the sound of the pump is light and heavy as the load changes. It is difficult to judge the operation of the equipment from the sound during the inspection. Judging the running condition of the equipment mainly depends on the temperature of the pump body and the change of the temperature of the first and second outlets. The temperature of the pump body is more important because the outlet temperature reflects the temperature slower than the pump body. Once the pump outlet temperature rises, the pump body temperature rises faster. It may be too late to process the pump.Molecular Vacuum Pump Price

Piston Vacuum Pump overhaul

For the inspection of the piston vacuum pump, it is generally necessary to completely disassemble the pump, comprehensively check, and measure the gap between the slide valve and the pump body (normal clearance is 0.04~0.12mm); check the slide valve and guide pump eccentric wheel in the pump Whether there are cracks on the surface, cracks on the surface, and immediate replacement; all the seals in the pump are replaced; in the dynamic operation of the pump, the vibration tester can be applied to test the vibration of the pump every week. According to the measured data, It can preliminarily determine the wear condition of bearings, slide valves and other components. When the bearing movement accuracy is reduced, replace it to avoid the impact and friction between the slide valve and the pump chamber due to the wear of the bearing. A vacuum gauge is applied to the repaired mechanical pump to perform an ultimate pressure test to determine the performance and repair effect of the pump. For old pumps that have been used for a long time, the gap of the pump is greater than 0.1mm and less than 0.2mm. The ultimate vacuum requirement is not very demanding. Vacuum pump oil with a kinematic viscosity of 150mm2/s can also be used to meet the normal operation of the pump.

Due to the wear of the pump chamber, the pump with a gap between the spool and the pump chamber greater than 0.2mm needs to cooperate with the manufacturer of the pump. According to the wear condition of the pump chamber, the spool valve, eccentric wheel and guide rail are specially made to make The pump cavity maintains a normal clearance; if the pump cavity is worn and severely scratched, the pumping time and the ultimate pressure cannot meet the process requirements. The repair spare parts cost is close to about half of the new pump price, and the maintenance value has been lost. The new spool valve should be replaced. Vacuum pump.Roots-vacuum-pump-working-principle

water ring vacuum pump advantages

The advantage is to evaluate one point of a thing or something. Everyone and everything has its own advantages. The difference in merits makes the difference between people and friends. It also causes the machine to be used by more people. . Now, the use of water ring vacuum pumps is quite extensive, so what advantages does it have?

1. The water ring vacuum pump has a coaxial direct connection design, which saves space and is easy to install.

2. All imported mechanical seals are used as standard equipment.

3, all use Y2 series motor, protection grade IP54, IP55.

4. All bearings are imported NTN or NSK.dry-screw-vacuum-pump-for-medical-packaging

5. The water ring vacuum pump is equipped with a cavitation protection tube interface. If it works under the limit pressure, open the cavitation protection tube interface (or connect with the separator) to eliminate the cavitation sound when the suction effect is maximized. And protect the pump.

6. The aluminum bronze impeller has high strength, durability and improved corrosion resistance of the vacuum pump. If the flow parts are made of stainless steel, they can work in more demanding environments.

7. The unique flexible exhaust port design does not produce over-compression, ensuring that the water ring vacuum pump is the most efficient in its performance range.

The advantages of the water ring vacuum pump are diverse, and because of its irreplaceable advantages, its market is more extensive, and the manufacturer's sales speed is faster. Of course, the premise is that we must ensure that the quality of the products is absolutely clear.liquid-ring-vacuum-pump-material

Roots vacuum pump operation

Roots vacuum pump units are used in metallurgy, petrochemical, paper, food, electronics, etc. The application range of Roots vacuum pumps is extremely wide. Many users are equipped with one or several spares, and some are long-term projects. If it does not work, the purchased vacuum product is temporarily placed. For this situation, there is a very important problem to be paid attention to. It is also a standard to ensure the life of the Roots vacuum pump, that is, the equipment that has been idle for a long time should discharge the cooling water in the pump chamber in time. Empty, it has a certain protective effect on the pump itself.

The actual production of the Roots vacuum pump is carried out through various processes. While strengthening the quality of the blank, this part of the deep processing is also strictly carried out. For the emergence of waste products, the management system that contributes to production should be done in a timely manner. In the case of order production, the waste products are effectively processed, and the working hours quota must be controlled. On the basis of doing these basic work, it is necessary to timely respond to the needs of the market and strengthen the optimization of the processing technology of the products.Air Cooled Roots Vacuum Pump

The application strength of Roots vacuum pump has become an important condition for promoting the development of enterprise productivity. Its application has different application capabilities in different industries, but the same point is that it cannot be used as a single pump and can only be assembled with other equipment. The use of the unit type products plays the foundation of mutual strength. Through the application performance of the equipment, it can effectively achieve higher performance strength for the use of other equipment and improve the application effect of the products.Double Stages Water Ring Vacuum Pumps 

Vacuum pump oil

A screw vacuum pump is a device that uses various methods to improve, create, and maintain a vacuum in an enclosed space. According to the working principle of vacuum pump, it is widely used in metallurgy, chemical, food, electronic coating and other industries. The correct use of vacuum pump oil is very important for the normal operation of the screw vacuum pump.

1. The window for oil loading must be clean and clean. It is strictly prohibited to be exposed to sunlight and stored in the open air. It should be stored in a dark, dry and ventilated place, and it should be mixed with water and dust.

2. The fueling appliance must be special equipment and should not be a container filled with other oils or solvents.turbo-molecular-pump-structure

3. When taking oil or loading oil, the impurities around the lid must be removed to prevent the impurities from mixing into the oil and causing the pump to wear.

4. When changing oil, drain the oil used in the pump body, pour the new oil into the pump shaft slowly, clean the pump chamber and drain the oil, repeat the cleaning several times, and then replace it with new oil after washing.

5. When mineral oil is exchanged with ester oil or other synthetic oil, the vacuum pump should be disassembled for thorough cleaning. All parts and components must be immersed in the ester oil to prevent contamination.

6. When the screw vacuum pump is overhauled, the components of the pump must be cleaned with solvent or cleaning agent, and the parts must be dried.
Two-stage-rotary-vane-vacuum-pump

Vacuum pump operation precautions

vacuum pump should pay attention to the following when it is used:

First, check the oil level, and it is advisable to fill the oil to the center of the oil mark when the pump is stopped. Too low to the exhaust valve can not act as an oil seal, affecting the degree of vacuum. Too high may cause fuel injection when the atmosphere is started. When operating, the oil level is raised, which is normal. Use a clean vacuum pump oil of the specified grade and add it from the filler hole. After refueling, the screw plug should be screwed on. The oil should be filtered to prevent debris from entering and clogging the oil holes.

Second, the pump can be started once in the atmosphere or under any vacuum. If the pump port is connected to a solenoid valve, it should be operated simultaneously with the pump.

Third, when the ambient temperature is too high, the temperature of the oil rises, the viscosity decreases, and the saturated vapor pressure increases, which causes the ultimate vacuum to decrease, especially the total pressure measured by a thermocouple. The ultimate vacuum can be improved by enhancing ventilation or improving pump performance.

Fourth, check the ultimate vacuum of the pump is based on the compressed mercury vacuum gauge. If the pre-extraction check is completed, the pump temperature will be stable, the pump port and the meter will be directly connected, and the ultimate vacuum will be reached within 30 minutes of operation. The value measured by the total pressure gauge is related to the pump oil and the vacuum gauge and the regulation error. Sometimes the error can be very large and can only be used as a reference.piston-vacuum-pump-process

Fifth, if the relative humidity is high, or the pumped gas contains more condensable steam, after opening the pumped container, the gas ballast valve should be opened, and the gas ballast valve should be closed after 20 to 40 minutes of operation. Before stopping the pump, the open air valve can be unloaded for 30 minutes to extend the life of the pump oil.

Sixth, oil selection: the viscosity of the pump oil affects the starting power and the ultimate vacuum of the pump. When the viscosity is high, the vacuum is favorable, and the starting power is larger. The saturated vapor pressure of the oil at the pump temperature will affect the ultimate pressure of the pump. The lower the better. The viscosity of high-speed vacuum pump oil and 3# diffusion pump oil is larger than that of No. 1 vacuum pump oil, and the saturated vapor pressure is lower than that of No. 1 vacuum pump oil, but the price of 3# diffusion pump oil is higher. The specific oil selected can be selected according to the above description combined with the specific use requirements.what-is-roots-vacuum-pump

Oil diffusion vacuum pump principle

Oil diffusion pump is a vacuum pump using low pressure, high speed and directional flow of oil vapor jet. The limit vacuum of this pump is 10-4-10-5 Pa, the working pressure range is 10-1-10-4 Pa, the pumping speed range is several hundred thousand liters/sec.
Oil diffusion pump is the main equipment to obtain high vacuum. It is widely used in vacuum smelting, vacuum coating, space simulation test and some vacuum systems insensitive to oil pollution. The oil diffusion pump is mainly composed of pump body, diffusion nozzle, steam conduit, oil pan, heater, diffuser, cooling system and jet nozzle.

When the oil diffusion pump is pre pumped to a vacuum of less than 1 pa, the oil pan can start heating. When boiling, the nozzle ejects a high-speed steam stream, and the heat-moving gas molecules diffuse into the steam stream, colliding with the directionally moving oil vapor molecules. The gas molecule therefore gains momentum and generates directional flow that is the same direction as the movement of oil vapor molecules. At the front stage, the oil vapor is condensed and the gas molecules are released, which is pumped by the front stage pump to achieve the purpose of pumping gas.

The vapor pressure of the pump directly affects the vacuum performance of the pump. However, any pump oil used by the oil diffusion pump is a mixture of different components with different vapor pressure. Therefore, in order to improve the pumping and vacuum performance of the oil diffusion pump, the pump itself has to fractionate and purify the pump oil. The purpose of fractionation is to keep the oil of high vapor pressure components from entering the high vacuum working nozzle (the nozzle at the high vacuum end); the purpose of purification is to make the oil of high vapor pressure components be continuously removed by the front pump during the working process, so that the oil gradually tends to be pure.

Rotary Vane Vacuum Pump