Double-section helical lead vacuum pump

Abstract

The invention relates to a double-section helical lead vacuum pump including a casing, a gas inlet end, a gas discharge end, a rotor assembly, a low pressure end plate, a plurality of low pressure section bearings, a plurality of high pressure section bearings, a pair of synchronous gears, and a motor; the casing is designed with a low pressure section and a high pressure section, and is provided with a low pressure section containing space and a high-pressure section containing space; the gas inlet end is formed in the low pressure section; and the gas discharge end is formed in the high pressure section; the rotor assembly is provided with a large lead section and a small lead section which are respectively arranged in the low pressure section containing space and the high-pressure section containing space; the low pressure end plate is connected to the low pressure section of the casing; the plurality of low pressure section bearings are arranged in the low-pressure end plate, and are used for supporting and fixing the rotor assembly; the plurality of high pressure section bearings are arranged in the high pressure section of the casing, and are used for supporting and fixing the rotor assembly; the pair of synchronous gears are connected with the rotor assembly from the low pressure section and drives the rotor assembly to run; and the motor is connected with the rotor assembly from the high pressure section and drives the rotor assembly to run. The vacuum pump casing is integrally formed without additional assembly and adjustment, and the replacement or repair of the rotor assembly is convenient.

Description

technical field [0001] The invention relates to a vacuum pump, in particular to a double-stage spiral lead vacuum pump which can be assembled conveniently. Background technique [0002] The vacuum pump is used to create a vacuum environment. Its function is to input air into an air inlet, and use the internal screw rotor to compress the low-pressure gas in the air inlet to the exhaust port at the high-pressure end to create a vacuum state. , so the quality of the vacuum manufacturing effect is closely related to the rotor, so the rotor is also called the heart of the vacuum pump. In addition to affecting the efficiency of the vacuum pump, it will also affect its service life and cost. [0003] Generally, in the prior art, the cost of electricity for vacuum pumps is quite high. The reason is that, according to the gas force equation F=AP, if the pressure at the exhaust end is approximately equal, the compressed cross-sectional area of ​​the rotor is also the same. Then the m...

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Problems solved by technology

[0002] The vacuum pump is used to create a vacuum environment. Its function is to input air into an air inlet, and use the internal screw rotor to compress the low-pressure gas in the air inlet to the exhaust port at the high-pressure end to create a vacuum state. , so the quality of the vacuum manufacturing effect is closely related to the rotor, so the rotor is also called the heart of the vacuum pump, which not only affects the efficiency of the vacuum pump, but also affects its service life and cost

[0003] Generally, in the prior art, the cost of electricity for vacuum pumps is quite high. The reason is that, according to the gas force equation F=AP, if the pressure at the exhaust end is approximately equal, the compressed cross-sectional area of ​​the rotor is also the same. Then the mechanical energy consumed by the rotor remains constant, so it will cause the cost of electricity or energy. Therefore, if the outer diameter of the rotor and the pitch are kept the same, this situation is not easy to solve. In order to solve this problem, there are The design of the rotor with double-leads is used to reduce the cross-sectional area of ​​the rear part of the rotor to reduce the gas force and further reduce the consumption of mechanical energy and waste of energy. However, the disadvantage of this design is that the rotors with two different leads must be Installed in two different housings, and then assembled, calibration must be carried out at the same time, so not only must a lot of manpower and time be spent on assembly, but it will also cause considerable inconvenience to replace or repair the rotor

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