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A vacuum pump structure

A vacuum pump and vacuum chamber technology, applied in the direction of pumps, machines/engines, mechanical equipment, etc., can solve problems such as inability to spread lubricating oil, achieve good sealing, reduce the probability of damage, and avoid excessive temperature rise.

Inactive Publication Date: 2011-12-14
SHENYANG SCI INSTR RES CENT CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are three main lubricating parts of the Roots vacuum pump: the shaft seal of the main shaft dynamic seal is generally lubricated with an oil cup; Skeleton seal, labyrinth seal or piston expansion ring seal, etc., cannot prevent the shaft seal from spreading the lubricating oil on the gear side into the vacuum chamber

Method used

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Embodiment Construction

[0018] The present invention is a vacuum pump structure, its structure diagram is as follows: figure 1 shown. The vacuum pump cavity is composed of a vacuum cavity 1, a gear box 2 and a motor cavity 3. The shielded motor 4 is fixed in the motor cavity 3, the motor main shaft 5 passes through the center of the shielded motor 4, and is supported by the support bearing A7 arranged in the motor cavity and the support bearing B9 arranged in the gearbox, and the driven shaft 6 is also supported by the support bearing A7 and supporting bearing B9 are supported, and the outstretched ends of the motor main shaft 5 and the driven shaft 6 are in the vacuum cavity 1 . The Roots rotor 11 is fixed on the extended ends of the motor main shaft 5 and the driven shaft 6 by means of expansion sleeve assemblies. The shaft seal assembly is installed in the center of the gear box 2 and sleeved on the motor main shaft 5 and the driven shaft 6 to block the vacuum chamber 1 and the motor chamber 3 ....

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Abstract

The invention discloses a vacuum pump structure, which is composed of a vacuum chamber, a gear box, a motor chamber, a shielded motor, a shaft seal structure, a motor main shaft, a driven shaft, a Roots rotor and the like. The vacuum pump is driven by a shielded motor, which is completely inside the motor cavity. The main shaft and driven shaft of the vacuum pump motor are partly cantilevered in the vacuum chamber without bearing support, which reduces the difficulty of processing and assembly, and reduces the chance of the bearing being damaged by the transmission medium in the pump during the working process. The shaft seal assembly structure is installed in the gearbox, which can block the diffusion of lubricating oil in the motor cavity to the vacuum cavity. The gas passage in the gear box allows gas to enter the shaft seal assembly, preventing excessive temperature rise or dust from entering the shaft seal. The transmission device of the vacuum pump is a gear with a transmission ratio of 1:1.

Description

technical field [0001] The invention relates to the field of vacuum equipment, in particular to a vacuum pump structure. Background technique [0002] Roots vacuum pump is a rotary positive displacement vacuum pump. Its structure is evolved from Roots blower. Its working principle is also similar to Roots blower. Most of them are installed vertically in the pump chamber by two "8"-shaped rotors. Rotate synchronously and reversely, and maintain a certain gap between the rotors and between the rotor and the pump casing to achieve the purpose of gap sealing, because the rotor rotates continuously. The pumped gas is sucked into the space between the rotor and the pump chamber from the air inlet, and then discharged through the exhaust port. [0003] The transmission mode of the Roots vacuum pump is roughly divided into two types. One is that the motor and the gear are placed on the same side of the rotor, and the driven rotor is directly driven by the gear at the motor end. Th...

Claims

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Application Information

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IPC IPC(8): F04C25/02
Inventor 张振厚王光玉孔祥玲
Owner SHENYANG SCI INSTR RES CENT CHINESE ACAD OF SCI
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