CN-224214373-U - Slide valve, screw compressor and mechanical equipment

CN224214373UCN 224214373 UCN224214373 UCN 224214373UCN-224214373-U

Abstract

The present disclosure provides a slide valve, a screw compressor, and a mechanical device. The slide valve is provided with a sealing structure, and after the sealing structure is arranged on the arranging groove on the slide valve body, a hydraulic compensation cavity is formed between the groove wall of the arranging groove and the sealing structure, and the hydraulic compensation cavity is communicated with an oil filling port of the slide valve, so that hydraulic oil is filled into the hydraulic compensation cavity. When the sliding valve runs for a long time and the sealing structure is worn, hydraulic oil in the hydraulic compensation cavity can apply pressure to the sealing structure. When the pressure is large enough, the sealing structure is closely attached to the surface of the sliding valve cavity, and meanwhile, due to interaction force, the whole sliding valve is jacked up for a certain distance, so that a gap between the sliding valve and the rotor is reduced. The sealing effect is improved well, so that leakage is reduced remarkably, compression efficiency is improved, meanwhile, due to elastic buffering of hydraulic compensation, abrasion of a sealing structure can be reduced, and the service life of the sealing structure is prolonged greatly.

Inventors

WU XIAOKUN
LI JIA
TANG HAN
BI YUSHI

Assignees

珠海格力电器股份有限公司

Dates

Publication Date: 20260508
Application Date: 20250516

Claims (12)

1. The utility model provides a slide valve, is applied to screw compressor, its characterized in that, the slide valve includes slide valve body and seal structure, the slide valve body is located the slide valve cavity of screw compressor, be provided with on the slide valve body with the mounting groove of seal structure adaptation, the mounting groove is located the slide valve body with the surface that the slide valve cavity is relative, seal structure arrange in the mounting groove, just seal structure with form the hydraulic pressure compensation chamber between the cell wall of mounting groove, the hydraulic pressure compensation chamber with the oiling mouth intercommunication of slide valve.
2. The spool valve of claim 1 wherein the sealing structure includes a first sealing strip and a second sealing strip, the seating groove includes a first arcuate groove and a second arcuate groove, the first sealing strip seats in the first arcuate groove, the second sealing strip seats in the second arcuate groove; The first arc groove and the second arc groove extend along the circumferential direction of the slide valve body, the first arc groove is located on the side where the male rotor of the screw compressor is located, the second arc groove is located on the side where the female rotor of the screw compressor is located, and in the axial direction of the slide valve body, the positions of the first arc groove and the second arc groove are the same.
3. The spool valve of claim 2 wherein the sealing structure includes a third sealing strip and a fourth sealing strip, the seating groove includes a third arcuate groove and a fourth arcuate groove, the third sealing strip is seated in the third arcuate groove, the fourth sealing strip is seated in the fourth arcuate groove; the third arc groove and the fourth arc groove extend along the circumferential direction of the slide valve body, the third arc groove is located on the side where the male rotor of the screw compressor is located, the fourth arc groove is located on the side where the female rotor of the screw compressor is located, the positions of the third arc groove and the fourth arc groove are the same in the axial direction of the slide valve body, and the positions of the first arc groove and the third arc groove are different.
4. A slide valve according to claim 3, characterized in that in the axial direction of the slide valve body, the position of the first arcuate groove is denoted as a first axial position, the position of the third arcuate groove is denoted as a second axial position, and the interval between the first axial position and the second axial position is greater than or equal to the tooth space of a male rotor in the screw compressor.
5. The spool valve of claim 3 wherein the spool valve, The outer surface of the slide valve body is provided with a first spiral groove, the first spiral groove is positioned between the first arc groove and the third arc groove, a first half cavity of the hydraulic compensation cavity is formed between the first sealing strip and the groove wall of the first arc groove, a third half cavity of the hydraulic compensation cavity is formed between the third sealing strip and the groove wall of the third arc groove, and the first half cavity and the third half cavity are respectively communicated with the first spiral groove; and/or the number of the groups of groups, The outer surface of the slide valve body is provided with a second spiral groove, the second spiral groove is located between the second arc groove and the fourth arc groove, a second half cavity of the hydraulic compensation cavity is formed between the second sealing strip and the groove wall of the second arc groove, a fourth half cavity of the hydraulic compensation cavity is formed between the fourth sealing strip and the groove wall of the fourth arc groove, and the second half cavity and the fourth half cavity are respectively communicated with the second spiral groove.
6. The spool valve according to claim 5 wherein an oil feed passage is provided in the spool valve body in communication with the oil fill port, the oil feed passage extending in an axial direction of the spool valve body and being in communication with each of the first half chamber, the second half chamber, the third half chamber and the fourth half chamber, the oil feed passage being for delivering oil filled from the oil fill port to the first half chamber, the second half chamber, the third half chamber and the fourth half chamber.
7. The spool valve of claim 5 wherein the spool valve, A first oil discharge channel is arranged in the slide valve body, the first half cavity and the second half cavity are communicated with the first oil discharge channel, and the first oil discharge channel is used for conveying oil of the first half cavity and the second half cavity to a rotor meshing zone of the screw compressor; and/or the number of the groups of groups, The sliding valve is characterized in that a second oil discharging channel is arranged in the sliding valve body, the third half cavity and the fourth half cavity are communicated with the second oil discharging channel, and the second oil discharging channel is used for conveying oil in the third half cavity and the fourth half cavity to a rotor meshing area of the screw compressor.
8. A spool valve according to any of claims 1-7, wherein the outer surface of the sealing structure is provided with a plurality of grooves extending in the circumferential direction of the spool valve body in a state in which the sealing structure is seated in the seating groove, and the plurality of grooves are arranged in the axial direction of the spool valve body.
9. A spool valve according to any of claims 1-7, characterised in that the sealing structure comprises a strip structure made of a composite material of polytetrafluoroethylene and graphite.
10. A spool valve according to any of claims 1-7, characterised in that the seating groove comprises a V-groove.
11. A screw compressor comprising a rotor and a slide valve according to any one of claims 1-10.
12. A mechanical device is characterized in that, the mechanical device comprising the screw compressor of claim 11.

Description

Slide valve, screw compressor and mechanical equipment Technical Field The disclosure relates to the technical field of compressors, and in particular relates to a slide valve, a screw compressor and mechanical equipment. Background Screw compressors typically employ reciprocating motion of a slide valve and an oil piston to effect capacity or pressure ratio adjustment. The principle of reciprocation of the spool valve and the oil piston is the same, whether it is capacity adjustment or pressure ratio adjustment. In screw compressors employing slide valves, the reliability of the slide valve sealing system is of great importance for the energy efficiency and the service life of the apparatus. If the sealing effect between the slide valve and the body slide valve cavity is poor, high-pressure gas flows back to the suction side of the rotor during the compression process, thereby reducing the volumetric efficiency of the compressor and reducing the energy efficiency. The sealing of the slide valve of the traditional screw compressor has the following technical defects: If any sealing device is not adopted, only the gap between the slide valve and the machine body slide valve cavity is controlled by the machining precision, a certain gap (for example, a gap of 3-4 wires and a gap of 1 wire equal to 0.01 millimeter) is inevitably reserved in the mode, so that the problem of high-pressure gas leakage is unavoidable, and along with long-term running of the slide valve, the gap between the outer circle of the slide valve and the machine body slide valve cavity is gradually increased, and the leakage problem is also more serious. And adopt fixed sealing washer, the sealing washer can't the automatic compensation clearance after wearing and tearing, after long-time operation, the whole sinking of slide valve leads to the clearance between slide valve up end and the rotor to increase, leads to the gas leakage in the compression process to also can reduce equipment energy efficiency. Disclosure of utility model In view of this, in order to solve the technical problem of poor sealing of the slide valve in the prior art, the disclosure provides a slide valve, a screw compressor and mechanical equipment. According to a first aspect of embodiments of the present disclosure, there is provided a slide valve applied to a screw compressor, the slide valve includes a slide valve body and a sealing structure, the slide valve body is located in a slide valve cavity of the screw compressor, a placement groove adapted to the sealing structure is provided on the slide valve body, the placement groove is located on an outer surface of the slide valve body opposite to the slide valve cavity, the sealing structure is disposed in the placement groove, and a hydraulic compensation cavity is formed between the sealing structure and a groove wall of the placement groove, and the hydraulic compensation cavity is communicated with an oil filling port of the slide valve. In an alternative embodiment of the present invention, The sealing structure comprises a first sealing strip and a second sealing strip, the arrangement groove comprises a first arc groove and a second arc groove, the first sealing strip is arranged in the first arc groove, and the second sealing strip is arranged in the second arc groove; The first arc groove and the second arc groove extend along the circumferential direction of the slide valve body, the first arc groove is located on the side where the male rotor of the screw compressor is located, the second arc groove is located on the side where the female rotor of the screw compressor is located, and in the axial direction of the slide valve body, the positions of the first arc groove and the second arc groove are the same. In an alternative embodiment of the present invention, The sealing structure comprises a third sealing strip and a fourth sealing strip, the arrangement groove comprises a third arc groove and a fourth arc groove, the third sealing strip is arranged in the third arc groove, and the fourth sealing strip is arranged in the fourth arc groove; the third arc groove and the fourth arc groove extend along the circumferential direction of the slide valve body, the third arc groove is located on the side where the male rotor of the screw compressor is located, the fourth arc groove is located on the side where the female rotor of the screw compressor is located, the positions of the third arc groove and the fourth arc groove are the same in the axial direction of the slide valve body, and the positions of the first arc groove and the third arc groove are different. In an alternative embodiment of the present invention, In the axial direction of the slide valve body, the position of the first arc groove is marked as a first axial position, the position of the third arc groove is marked as a second axial position, and the interval between the first axial position and the second axial position is larger than o