CN210769199U

CN210769199U - Oblique oil groove structure of compressor piston

Info

Publication number: CN210769199U
Application number: CN201921355369.9U
Authority: CN
Inventors: 张勤建; 葛丽霞; 姚辉军; 裘建伟; 李峰
Original assignee: Jiaxipera Compressor Co Ltd
Current assignee: Jiaxipera Compressor Co Ltd
Priority date: 2019-08-20
Filing date: 2019-08-20
Publication date: 2020-06-16
Anticipated expiration: 2029-08-20

Abstract

The utility model discloses an oblique oil groove structure of compressor piston, including the piston body of cylindricality, be equipped with first annular oil groove on the lateral wall of piston body, the axis of first annular oil groove sets up with the axis off-centre of piston body. The utility model provides an oblique oil groove structure of compressor piston, simple structure guarantees to have sufficient lubrication action between cylinder hole and the piston, makes the advantage in the aspect of the compressor performance, simultaneously, control oil circulation volume that can also be fine.

Description

Oblique oil groove structure of compressor piston

Technical Field

The utility model belongs to the technical field of the compressor technology and specifically relates to a compressor piston oblique oil groove structure is related to.

Background

The compressor is the heart of the refrigerating system and mainly comprises a pump body, a motor and a shell. The mechanical properties of the components within the pump body structure directly affect the performance of the compressor. The piston is one of the important parts of the pump body of the compressor, and bears the important work of compressing high-temperature and high-pressure gas refrigerant and directly converting mechanical energy into internal energy in the whole operation process of the compressor.

For a general reciprocating refrigeration compressor, a piston performs reciprocating motion in a cylinder to compress a refrigerant to do work. The piston can cause drastic change of pressure in the cylinder when moving in the cylinder, and the requirement on the matching precision between the piston and the cylinder wall is very high, so that the sealing requirement is met, the motion guiding effect of the piston in the cylinder is also realized, and the motion track of the piston is ensured. The existing polished rod piston outer wall is completely in surface contact with the wall of an air cylinder hole, the contact area and the friction area are large, the inner wall of the air cylinder can be caused to deform in a micro mode when the pressure in the air cylinder changes violently in the working process, the piston moves in the air cylinder at a high speed, scraping and abrasion between the inner wall of the air cylinder and the piston body are caused, and the mechanical loss is too large to influence the performance. The existing piston with an oil groove structure has advantages in performance, but the oil circulation amount is too large, so that the lubrication of the piston is not facilitated.

Chinese patent application publication No. CN208595042U, published as 2019, 03, 12 and entitled "a reciprocating compressor piston middle body", discloses a reciprocating compressor piston middle body, which includes a cylindrical body, a plurality of piston ring grooves are processed on the outer circumferential surface of the body, a central hole is provided at the center of the body for sleeving with a piston rod, a plurality of axial through holes are evenly distributed on the end surface of the body in the circumferential direction, a radial lubricating oil hole is provided on a part of the piston ring grooves and communicated with one of the axial through holes, and a ring groove is processed on each of the two end surfaces of the body for communicating each axial through hole. The axial through hole designed by the patent is used for ensuring that the piston intermediate body is not overweight, and the structure can improve the overall strength of the piston intermediate body. However, the patentees have the problem that the oil circulation amount is too large, which is not beneficial to the lubrication of the piston.

Disclosure of Invention

The utility model discloses an overcome among the prior art too big in the piston ring groove oil circulation volume, be unfavorable for the lubricated problem of piston, provide a compressor piston oblique oil groove structure, simple structure guarantees to have sufficient lubrication action between cylinder hole and the piston, makes the advantage in the aspect of the compressor performance, simultaneously, control oil circulation volume that can also be fine.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides an oblique oil groove structure of compressor piston, includes the piston body of cylindricality, is equipped with first annular oil groove on the lateral wall of piston body, and the axis of first annular oil groove sets up with the axis off-centre of piston body.

In the structure, lubricating oil in the first annular oil groove can provide lubrication when the piston moves, the first annular oil groove is eccentrically arranged, the lubricating oil is unevenly distributed on the piston, a place with shallow depth in the first annular oil groove has a good bottleneck effect, and the circulation volume of the lubricating oil is controlled. Under the unchangeable condition of oil mass in guaranteeing first annular oil groove, control oil circulation volume that above-mentioned structure can be fine.

Preferably, the maximum depth of the first annular oil groove is 2-20 times of the minimum depth of the first annular oil groove. The structure can guarantee that lubricating oil exists in each position of the first annular oil groove, and the circulation volume of the lubricating oil is effectively controlled.

Preferably, a second annular oil groove is formed in the outer side wall of the piston body, the axial cross section of the second annular oil groove is of an arch structure, and the second annular oil groove is communicated with the first annular oil groove. The second annular oil groove of the arch structure can ensure that enough lubricating oil enters a gap between the side wall of the piston and the cylinder body, and the lubricating effect is ensured.

Preferably, the second annular oil groove is disposed coaxially with the piston body. The structure can ensure that all positions of the side wall of the piston body can be supplemented with enough lubricating oil through the second annular oil groove.

Preferably, the first annular oil groove is arranged at the bottom of the second annular oil groove. The structure can make the piston structure more symmetrical and compact.

Preferably, the piston body is provided with a pin hole radially penetrating through the piston, and the axis of the first annular oil groove and the axis of the pin hole are in the same plane. The structure makes the axis symmetry setting of first annular oil groove relative pinhole, and when the piston removed, symmetrical structure can reduce the vibration and the skew of piston, reduces the wearing and tearing between degree piston and the cylinder body.

As preferred, be equipped with on the piston body and hold the chamber, first annular oil groove bottom is equipped with oil gas hole, and oil gas hole intercommunication holds chamber and first annular. The oil gas hole can be with first annular oil groove with hold the chamber intercommunication, the exchange, the replenishment and the change of the lubricating oil of being convenient for.

Preferably, the number of the oil gas holes is 2, and the 2 oil gas holes are symmetrically distributed on two sides of the pin hole. Said several ensure the symmetry of the piston.

The utility model has the advantages that: (1) the lubrication between the piston and the cylinder body is ensured, and the circulation quantity of lubricating oil in the piston can be well controlled due to the structure of the inclined oil groove; (2) the piston is of a symmetrical structure, and vibration and abrasion of the piston can be reduced.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

fig. 2 is a cross-sectional view of the present invention;

FIG. 3 is a schematic structural view of embodiment 2.

In the figure: piston body 1, first annular oil groove 2, second annular oil groove 3, pinhole 4, hold chamber 5, oil gas hole 6.

Detailed Description

The invention is further described with reference to the accompanying drawings and specific embodiments.

Example 1:

as shown in fig. 1 and 2, the oblique oil groove structure of the compressor piston comprises a cylindrical piston body 1, wherein a first annular oil groove 2 is arranged on the outer side wall of the piston body 1, the axis of the first annular oil groove 2 is eccentrically arranged with the axis of the piston body 1, and the maximum depth of the first annular oil groove 2 is 2-20 times of the minimum depth of the first annular oil groove 2; be equipped with the pinhole 4 that holds chamber 5 and radially run through the piston on piston body 1, the axis of first annular oil groove 2 is in the coplanar with the axis of

pinhole

4, and 2 bottoms of first annular oil groove are equipped with 2

oil gas holes

6, and 6 symmetric distribution in pinhole 4 both sides in 2 oil gas holes 6, and oil gas hole 6 intercommunication holds chamber 5 and first annular.

In the structure, lubricating oil in the first annular oil groove 2 can provide the lubrication action when the piston moves, the first annular oil groove 2 is eccentrically arranged, the lubricating oil is unevenly distributed on the piston, a good bottleneck effect is realized at a shallow position of the depth in the first annular oil groove 2, and the circulation volume of the lubricating oil is reduced. Under the unchangeable condition of the oil volume in guaranteeing first annular oil groove 2, control oil circulation volume that above-mentioned structure can be fine. The structure enables the first annular oil groove 2 to be symmetrically arranged relative to the axis of the pin hole 4, and when the piston moves, the symmetrical structure can reduce the vibration and the offset of the piston and reduce the abrasion between the piston and the cylinder body. Oil gas hole 6 can be with first annular oil groove 2 with hold chamber 5 intercommunication, the exchange, the replenishment and the change of the lubricating oil of being convenient for.

Example 2:

as shown in fig. 3, on the basis of embodiment 1, a second annular oil groove 3 is provided on the outer side wall of the piston body 1, the second annular oil groove 3 is coaxially provided with the piston body 1, the axial cross section of the second annular oil groove 3 is of an arch structure, the first annular oil groove 2 is provided at the bottom of the second annular oil groove 3, and the second annular oil groove 3 is communicated with the first annular oil groove 2. The second annular oil groove 3 can ensure that all positions of the side wall of the piston body 1 can be supplemented with enough lubricating oil through the second annular oil groove 3.

The utility model has the advantages that: the lubrication between the piston and the cylinder body is ensured, and the structure of the inclined oil groove can well control the circulation amount of lubricating oil in the piston of the compressor; the piston is of a symmetrical structure, and vibration and abrasion of the piston can be reduced.

Claims

1. The utility model provides an oblique oil groove structure of compressor piston, includes the piston body of cylindricality, is equipped with first annular oil groove on the lateral wall of piston body, characterized by, the axis of first annular oil groove and the eccentric setting of the axis of piston body.

2. The compressor piston slopping oil groove structure as claimed in claim 1, wherein said first annular oil groove has a maximum depth 2 to 20 times as large as a minimum depth of the first annular oil groove.

3. The oblique oil groove structure of compressor piston as claimed in claim 1, wherein the outer sidewall of said piston body is provided with a second annular oil groove, the axial cross section of the second annular oil groove is of an arch structure, and the second annular oil groove is communicated with the first annular oil groove.

4. The compressor piston slopping groove structure as claimed in claim 3, wherein said second annular oil groove is provided coaxially with the piston body.

5. The compressor piston slop oil groove structure as claimed in claim 4, wherein the first annular oil groove is provided at the bottom of the second annular oil groove.

6. The structure of the oblique oil groove of the compressor piston as claimed in claim 1, 2, 3, 4 or 5, wherein the piston body is provided with a pin hole radially penetrating the piston, and the axis of the first annular oil groove is in the same plane as the axis of the pin hole.

7. The oblique oil groove structure of compressor piston as claimed in claim 6, wherein said piston body is provided with a receiving cavity, and the bottom of the first annular oil groove is provided with oil and gas holes, which communicate the receiving cavity with the first annular groove.

8. The structure of claim 7, wherein the number of the oil and gas holes is 2, and the 2 oil and gas holes are symmetrically distributed on two sides of the pin hole.