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Double-screw-rod compressor radial bearing combination structure with sealing function

A technology of radial bearing and combined structure, which is applied to the sealing device of piston pump, the components of pumping device for elastic fluid, mechanical equipment, etc. The problem of high lubricant supply pressure has achieved the effect of widening the operating speed range, simplifying the system structure, and solving the problem of high lubricant supply pressure

Active Publication Date: 2019-05-21
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a radial bearing combination structure of a twin-screw compressor with a sealing effect, so as to solve the problem that the bearing is easy to wear due to insufficient bearing capacity when the low-viscosity fluid is lubricated in the prior art, and the sliding bearing of the high-pressure screw compressor For the problem of high lubricant supply pressure, the present invention greatly enhances its bearing capacity by adopting the combination of sliding bearing and rolling bearing to bear radial load, and effectively solves the problem of insufficient bearing capacity when lubricated by low-viscosity lubricant

Method used

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  • Double-screw-rod compressor radial bearing combination structure with sealing function
  • Double-screw-rod compressor radial bearing combination structure with sealing function
  • Double-screw-rod compressor radial bearing combination structure with sealing function

Examples

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Effect test

Embodiment 1

[0023] Take the bearing structure at the exhaust end of the male rotor as an example, such as figure 1 As shown, the radial bearing combination structure includes a radial dynamic pressure sliding bearing 5 and a rolling bearing 4 . The bearing bush at the middle position in the axial direction of the sliding bearing 5 is provided with an outflow hole, and the lubricant here can be led to the position of the shaft seal 3 through the sealant supply flow path 9, and can be used as a sealant to provide high sealing pressure and flow out. hole position as figure 2 As shown, it needs to be set in the convergent area of ​​the gap during the operation of the sliding bearing 5, and the position is finally determined according to the required sealing pressure; in addition, the material of the sliding bearing 5 is ordinary materials, not expensive special materials that are resistant to wear, and when the lubricating medium (such as water, etc.) is corrosive, only need to spray corros...

Embodiment 2

[0026] Such as image 3 As shown, the difference between Embodiment 2 and Embodiment 1 is that the number of sliding bearings 5 ​​in the bearing combination structure is multiple (two are shown in the figure), so as to increase the bearing capacity of the sliding bearings and increase the corresponding lubricant supply flow Path 7 and lubricant return path 8.

Embodiment 3

[0028] Such as Figure 4 As shown, the difference between Embodiment 3 and Embodiment 2 is that a rolling bearing 4 is added on the side of the rotor shaft away from the rotor cavity, that is, the number of rolling bearings 4 in the bearing combination structure is 2, so as to avoid when there are too many sliding bearings 5 , The length of the rotor shaft is too long to cause the shaft to deform due to insufficient rigidity, so that the sliding bearing 5 and the wall surface of the bearing cavity 6 are rubbed.

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Abstract

The invention discloses a double-screw-rod compressor radial bearing combination structure with a sealing function. The double-screw-rod compressor radial bearing combination structure comprises at least one sliding bearing and at least one rolling bearing which are connected to a shaft of a rotor, wherein the middle position in the axial direction of the at least one sliding bearing is provided with a lubricating agent supply flowing path for feeding a lubricating agent, a bearing cavity on the outer sides of the at least one sliding bearing and the at least one rolling bearing is connected to a rotor cavity on the outer side of the rotor through a lubricating agent return flowing path, a bearing bush of the at least one sliding bearing is provided with an outflow hole, and the lubricating agent at the outflow hole is taken as sealing liquid to be supplied to a shaft seal of the rotor through a sealing liquid supply flowing path. According to the double-screw-rod compressor radial bearing combination structure with the sealing function, combination of the at least one sliding bearing and the at least one rolling bearing is utilized to bear radial load together, the bearing capacity of the double-screw-rod compressor radial bearing combination structure is greatly enhanced, and the problem of insufficient bearing force in lubricating of a low-viscosity lubricating agent is solved; meanwhile, by means of the bearing combination, the service life of the bearings is greatly prolonged, the reliability of a compressor is enhanced, and the runnable rotating speed range of the compressor is also widened; and in addition, leakage of the shaft seal is completely eradicated effectively, and the compressor performance is improved.

Description

technical field [0001] The invention relates to the field of screw compressors, in particular to a combined radial bearing structure of a twin-screw compressor with a sealing function. Background technique [0002] At present, the market share of screw compressors has accounted for more than 80% of all positive displacement compressors. As a key component of screw compressors, bearings directly affect the reliability of the compressor, and also become the biggest obstacle for some new technologies. Such as water-lubricated screw air compressors and refrigerant-lubricated oil-free screw refrigeration compressors, the bearings are water-lubricated and refrigerant-lubricated. Since both water and refrigerant are low-viscosity fluids, and the radial force of the screw compressor is often large, the bearing capacity of the radial bearing is insufficient, the wear of the bearing is serious, and the life is short, especially for the compressor that needs to be frequently started a...

Claims

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Application Information

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IPC IPC(8): F04C29/02F04C29/00F04C27/00
Inventor 王闯邢子文张益钦王莹陈文卿
Owner XI AN JIAOTONG UNIV
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