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A kind of screw vacuum pump with dynamic sealing structure

A technology of screw vacuum pump and dynamic sealing structure, which is applied in the direction of rotary piston type/oscillating piston type pump parts, sealing device of piston pump, parts of pumping device for elastic fluid, etc., which can solve the problem of fragile sealing components, The service life is reduced, the gas temperature rises and other problems, and the effect of reducing wear and temperature rise, reducing high wear and lowering working temperature is achieved.

Active Publication Date: 2017-05-17
伯仲(山东)工业设备有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The working process of the screw vacuum pump is divided into four processes: suction, equal-volume transportation, compression, and exhaust. During the process of compression and exhaust, the temperature of the gas will rise sharply, resulting in a higher temperature of the rotor and shaft at the exhaust end. Sealing components Under the harsh working conditions of high temperature and high speed, and the direct contact between the dynamic and static rings of traditional mechanical seals, the sealing components are vulnerable and the service life is greatly reduced

Method used

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  • A kind of screw vacuum pump with dynamic sealing structure
  • A kind of screw vacuum pump with dynamic sealing structure
  • A kind of screw vacuum pump with dynamic sealing structure

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Embodiment Construction

[0037] The present invention will be further described through the embodiments below in conjunction with the accompanying drawings.

[0038] see figure 1 , a screw vacuum pump with a dynamic seal structure includes a pump body 21, a front end cover 3, a rear end cover, a shaft 1 and a rotor 2. One side of the pump body 21 is radially provided with an air inlet port, and the front end cover 3 and the rear end cover are respectively fixedly mounted on both ends of the pump body 21 in the axial direction. One side of the front end cover 3 is respectively provided with an exhaust port and a cooling medium inlet in the radial direction. A cooling medium outlet is arranged radially on one side of the rear end cover. The rotor 2 is set and fixed on the shaft 1, and the rotor 2 is located in the pump body 21; one end of the shaft 1 is fixed in the rear end cover, and the other end extends to the outside of the front end cover 3, and a sealing mechanism is provided between the shaft ...

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Abstract

The invention discloses a screw vacuum pump of a motive seal structure. The screw vacuum pump comprises a pump body, a front end cap, a rear end cap, a shaft and a rotor. A sealing mechanism is arranged between the shaft and the front end cap. The sealing mechanism further comprises a cooling casing pipe. A cooling channel is arranged in the cooling casing pipe. The cooling channel is filled with a cooling medium so as to prevent heat from transferring along an axial shaft seal part from the rotor, and thus the working temperature of a mechanical sealing assembly is lowered. The friction pair surface of a sealing static ring of the sealing mechanism is subjected to surface texture treatment so as to effectively reduce the surface abrasion of a friction pair and reduce temperature rise of the end face of the friction pair; meanwhile, a heat insulating layer, formed between the shaft and the rotor, of the cooling casing pipe is used for preventing the heat from transferring to an exhaust end shaft seal, and the working environment of a shaft seal component is improved, so that the service life of the seal assembly is prolonged.

Description

technical field [0001] The invention belongs to the field of vacuum technology, in particular to a screw vacuum pump. Background technique [0002] The screw vacuum pump belongs to the non-contact dry pump. It is an ideal vacuum pump that appeared in the early 1990s. It is widely used in microelectronics, semiconductors, pharmaceuticals, precision machining and other industries due to its advantages of no oil pollution. After 20 years of rapid development of domestic screw vacuum pumps, its main performance indicators (such as pumping speed, ultimate pressure, energy consumption, zero-flow compression ratio, and pressure difference) have reached or approached foreign advanced levels; There is still a big gap between reliability and foreign advanced pumps, and its dynamic sealing technology is one of the main influencing factors. How to improve the reliability of the seal and the service life of the seal has become a key issue facing the current domestic screw pump market. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04C18/107F04C27/00F04C25/02F04C29/04F04C29/02
CPCF04C18/107F04C25/02F04C27/00F04C29/02F04C29/04
Inventor 王国栋王庆生陈宗武李卓慧祝敏郭金光郑志陈长琦
Owner 伯仲(山东)工业设备有限公司
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