CN105804970A

CN105804970A - Compressor piston

Info

Publication number: CN105804970A
Application number: CN201410850630.8A
Authority: CN
Inventors: 陶明飞
Original assignee: Sanden Huayu Automotive Air Conditioning Co Ltd
Current assignee: Sanden Huayu Automotive Air Conditioning Co Ltd
Priority date: 2014-12-31
Filing date: 2014-12-31
Publication date: 2016-07-27

Abstract

The invention aims at providing a compressor piston. Lubricating oil can be provided for the piston via a cylinder hole or an exhaust cavity, so that the piston is sufficiently lubricated. In order to achieve the purpose, the compressor piston comprises a piston seat and a piston head, wherein the piston seat is used for being matched with a driving mechanism so as to enable the piston to move in the cylinder hole in a reciprocating manner; the piston head is used for forming sliding contact with the cylinder hole; and the piston head comprises an outer circumferential surface and an end surface. The compressor piston is characterized in that the piston head is further provided with a lubricating channel which connects the end surface with the outer circumferential surface.

Description

Compressor piston

Technical field

The present invention relates to piston for compressor.

Background technology

Application number is CN96190823.8, publication number is that the Chinese patent application document of CN1163655A proposes a kind of compressor piston, as shown in Figure 4, forms circumferentially extending first groove 16 and axially extended second groove 17 on the periphery of piston 11.Owing to piston 11 is in reciprocatory movement, the second groove 17 intermittently communicates with the crankshaft cavity of compressor, and the lubricating oil of crankshaft cavity can be stored in the second groove 17, and flow to the first groove 16, makes the most of area on piston periphery be lubricated.

But owing to lubricating oil is identical with flowing to of the refrigerant gas in compressor, therefore the lubricating oil in crankshaft cavity moves to discharge chamber step by step, and petrol starvation occurs in crankshaft cavity, it is impossible to provide sufficient lubricating oil in time to the second groove 17.

Summary of the invention

It is an object of the invention to provide a kind of compressor piston, lubricating oil can be provided by cylinder-bore or discharge chamber to piston, make piston obtain more sufficient lubrication.

For realizing described purpose compressor piston, including piston seat and piston head, described piston seat is for coordinating with driving mechanism, so that piston can move back and forth in cylinder-bore, described piston head is used for and described cylinder-bore sliding contact；Described piston head includes outer circumference surface and end face；Being characterized in, described piston head also has lubrication channel, and described end face is connected by described lubrication channel with described outer circumference surface.

Described compressor piston, its further feature is, described lubrication channel includes first passage, second channel and cannelure, first passage extends and not through described piston head towards described piston seat direction from described end face, described cannelure is arranged on described outer circumference surface, and described second channel connects described first passage and described cannelure.

Described compressor piston, its further feature is, described lubrication channel includes opening and is positioned at multiple oil grooves that described end face extends on described outer circumference surface, and the other end of described oil groove is closed.

Described compressor piston, its further feature is, the axially inclined setting of the relatively described piston of described oil groove.

Described compressor piston, its further feature is, described oil groove is spiral type.

Described compressor piston, its further feature is, described lubrication channel includes the axial multiple straight line oil grooves and the annular oil groove that are parallel to described piston, and described straight line oil groove connects described annular oil groove.

Owing to the opening of lubrication channel is positioned at the end face of piston head, the other end is to close, when piston moves in the cylinder, cylinder alternately sucks and compresses discharging refrigerant gas, cold-producing medium is pressed into lubrication channel by the pressure in cylinder, this refrigerant temperature is relatively low, containing more lubricating oil, therefore ball hole can be carried out forced feed lubrication.

Accompanying drawing explanation

The above and other features of the present invention, character and advantage will be become readily apparent from by the description below in conjunction with drawings and Examples, wherein:

Fig. 1 is the sectional view of the bi-directional swash plate type compressor for Vehicular air-conditioning apparatus；

Fig. 2 is the right view of piston and valve board structure in Fig. 1；

Fig. 3 A is the schematic diagram of piston in another embodiment of the present invention；

Fig. 3 B is the schematic diagram of the variation of Fig. 3 A illustrated embodiment；

Fig. 3 C is the schematic diagram of another variation of Fig. 3 A illustrated embodiment.

Fig. 4 is the schematic diagram of existing compressor piston.

Detailed description of the invention

Below in conjunction with specific embodiments and the drawings, the invention will be further described; elaborate more details in the following description so that fully understanding the present invention; but the present invention obviously can implement with the multiple alternate manner being different from this description; those skilled in the art can do similar popularization, deduction according to practical situations when without prejudice to intension of the present invention, therefore should with content constraints protection scope of the present invention of this specific embodiment.

Embodiment 1

Fig. 1 to Fig. 2 illustrates one embodiment of the present of invention; it should be noted that; these and other accompanying drawing follow-up are all only used as example, and it is not what to draw according to the condition of equal proportion, and should not be construed as limiting in this, as to the protection domain of actual requirement of the present invention.

It is the sectional view of the bi-directional swash plate type compressor for Vehicular air-conditioning apparatus as shown in Figure 1.This bi-directional swash plate type compressor has a pair front-bank rotor housing 12 and rear-bank rotor housing 13, and bolt 16, by also tight to front-bank rotor housing 12 and rear-bank rotor housing 13, forms swash plate chamber 40.Driving and run through swash plate 5, forward thrust bearing 6A, back pressure bearing 6B on axle 11, forward thrust bearing 6A, back pressure bearing 6B are supported respectively on front-bank rotor housing 12 and rear-bank rotor housing 13.Front/rear cover 14,15 is respectively equipped with suction muffler 32 and discharge chamber 31.Driving axle 1 when driving swash plate 5 to rotate, swash plate 5 both sides are coordinated with piston 20 by crawler shoe 19, and when swash plate 5 rotates, piston 20 is reciprocating, and cold-producing medium sucks cylinder-bore 30A or 30B, and compress heel row and go out cylinder-bore 30B or 30A.

The end face of front-bank rotor housing 12 and rear-bank rotor housing 13 is provided with plate member, and for this plate member that the end face of rear-bank rotor housing 13 is arranged, it includes valve plate 33, suction valve chip 36, exhaust valve plate 37, and valve plate 33 is provided with suction hole 34, steam vent 35.Piston 20 is towards when moving away from valve plate 33 direction, and suction hole 34 is opened by suction valve chip 36, and cylinder-bore 30B sucks gas.Piston 20 is towards when moving near valve plate 33 direction, and steam vent 35 is opened by exhaust valve plate 37, and gas is discharged from cylinder-bore 30B.

As shown in Figure 2, piston 20 includes piston seat 21 and piston head 22, piston seat 21 coordinates with crawler shoe 19, piston 20 is made to move back and forth in cylinder-bore 30B and 30A, outer circumference surface 25 and cylinder-bore 30B, the 30A sliding contact of piston head 22, offers lubrication channel between end face 24 and the outer circumference surface 25 of piston head 22 and is connected with outer circumference surface 25 by end face 24.

This lubrication channel includes first passage 26A, second channel 26B and cannelure 26C, first passage 26A is axially extending from the end face 24 of piston 20 towards piston seat 21 direction, do not punch whole piston head 22, parallel with piston axis or overlap, cannelure 26C is located on the outer circumference surface 25 of piston head 22, second channel 26B radially extends, and connects first passage 26A and cannelure 26C.

With more sufficient lubricating oil in suction muffler 32, when piston 20 lateral movement backwards, namely during F1 direction, rear side cylinder-bore 30B is in instroke, and the gas in cylinder-bore 30B discharges to discharge chamber 31.Rear side cylinder-bore 30B pressure is relatively big, and piston 20 is subject to air-flow forward and pressure.Air-flow quickly pours into first passage 26A, flows to cannelure 26C through second channel 26B.Outside piston side face 25 is lubricated, and piston 20 continues to move towards F1 direction, and the lubricating oil in annular groove 26C can form oil film between the excircle 25 of cylinder-bore 30B, 30A and piston head, reduces lubrication friction between the two.When piston 20 moves in the opposite direction, the lubricant effect of opposite side piston head is in like manner.

Embodiment 2

The present embodiment continues to use element numbers and the partial content of previous embodiment, wherein adopts identical label to represent identical or approximate element, and optionally eliminates the explanation of constructed content.Explanation about clipped can refer to previous embodiment, and it is no longer repeated for the present embodiment.

As shown in Fig. 3 A to Fig. 3 C, for the axially longer piston of outer circumference surface, cover rapidly bigger regional extent for lubricating oil, at the outside piston Zhou Kaishe oil groove 27 prolonged to piston seat 21 direction from end face 24.Large area is covered: be arranged to skewed by oil groove 27 when arranging a small amount of oil groove 27；Also oil groove 27 can be arranged to spiral type；Or as shown in Figure 3 C, oil groove can also include straight line oil groove 27, is aided with cannelure 28.The front end (left end) of oil groove 27 is to close.Air-flow quickly pours into oil groove (and cannelure), in piston movement process, outside piston side face is lubricated, and forms oil film, reduce lubrication friction between the two between cylinder-bore and outside piston side face 25.

Although the present invention is with preferred embodiment openly as above, but it is not for limiting the present invention, and any those skilled in the art without departing from the spirit and scope of the present invention, can make possible variation and amendment.Therefore, every content without departing from technical solution of the present invention, according to any amendment, equivalent variations and modification that above example is made by the technical spirit of the present invention, each fall within the protection domain that the claims in the present invention define.

Claims

1. compressor piston, including piston seat and piston head, described piston seat is for coordinating with driving mechanism, so that piston can move back and forth in cylinder-bore, described piston head is used for and described cylinder-bore sliding contact；Described piston head includes outer circumference surface and end face；It is characterized in that, described piston head also has lubrication channel, and described end face is connected by described lubrication channel with described outer circumference surface.

2. compressor piston as claimed in claim 1, it is characterized in that, described lubrication channel includes first passage, second channel and cannelure, first passage extends and not through described piston head towards described piston seat direction from described end face, described cannelure is arranged on described outer circumference surface, and described second channel connects described first passage and described cannelure.

3. compressor piston as claimed in claim 1, it is characterised in that described lubrication channel includes opening and is positioned at multiple oil grooves that described end face extends on described outer circumference surface, and the other end of described oil groove is closed.

4. compressor piston as claimed in claim 3, it is characterised in that the axially inclined setting of the relatively described piston of described oil groove.

5. compressor piston as claimed in claim 3, it is characterised in that described oil groove is spiral type.

6. compressor piston as claimed in claim 3, it is characterised in that described lubrication channel includes the axial multiple straight line oil grooves and the annular oil groove that are parallel to described piston, and described straight line oil groove connects described annular oil groove.