CN201546929U

CN201546929U - Compressor piston

Info

Publication number: CN201546929U
Application number: CN2009202113691U
Authority: CN
Inventors: 王立健; 王瑜; 苏开波
Original assignee: SHANGHAI KENA ELECTRICAL MACHINERY CO Ltd
Current assignee: SHANGHAI KENA ELECTRICAL MACHINERY CO Ltd
Priority date: 2009-10-27
Filing date: 2009-10-27
Publication date: 2010-08-11
Anticipated expiration: 2019-10-27

Abstract

The utility model relates to a piston of a reciprocating type refrigeration plant compressor. The piston is characterized in that the conventional cylindrical skirt is changed into the elliptic cylinder skirt, the center of the ellipse is combined with the center of the head of the piston, the radius of the long half axle of the ellipse is equal to the radius of the head of the piston, the radius of the short half axle of the ellipse is smaller than the radius of the head of the piston, and the ratio of the radius of the short half axle of the ellipse to the radius of the head of the piston is 0.94 to 1. According to the utility model, the contact area of the piston body with the inner wall of the cylinder is reduced, thereby the scrapping and wearing between the inner wall of the cylinder and the piston body is reduced, the mechanical loss is further reduced.

Description

Compressor piston

Technical field

The utility model relates to the piston of the compressor of reciprocatable refrigerating equipment.

Background technique

For general reciprocatable refrigerating equipment compressor, piston moves back and forth at cylinder internal, and then the compression refrigerant acting.Piston can cause the acute variation of inner cylinder pressure when moving in cylinder, and the requirement of the quality of fit between piston and the cylinder wall is very high, should satisfy the requirement of sealing, also will play the effect of piston motion guide in cylinder, guarantees the movement locus of piston.Piston in the existing reciprocatable refrigerating equipment compressor adopts the cylindric of an integral body more, is connected in the cylinder by transmission device and motor and does work.In the course of the work, can cause during the inner cylinder pressure acute variation that the deformation of trace takes place cylinder inner wall, piston high-speed motion in cylinder causes scratch and the wearing and tearing between cylinder inner wall and the piston body, and mechanical loss is excessive.

Summary of the invention

The utility model will solve piston and cause scratch and wearing and tearing between cylinder inner wall and the piston body, the problem that mechanical loss is excessive during high-speed motion in cylinder.The utility model improves the piston body skirt section, the profile in skirt section is by traditional cylindrical elliptical cylinder-shape that changes into, oval center and piston crown center are harmonious, oval major semi axis radius is identical with the piston crown radius, oval semi-minor axis radius is less than the piston crown radius, and both ratio is 0.94-1.The skirt section is the 30%-50% of piston length overall near the side of head and the distance of piston crown end face.By above-mentioned improvement, reduced the area of contact between piston body and cylinder inner wall, thereby cut down scratch and wearing and tearing between cylinder inner wall and the piston body, and then reduced mechanical loss.

Description of drawings

Fig. 1 is the front view of the utility model piston, and wherein 1 is salient point, and 2 is piston crown, and 3 is piston pin boss.

Fig. 2 is the left view of the utility model piston, and wherein 1 is salient point.

Fig. 3 is the bottom view of the utility model piston, and wherein 4 is the piston skirt, and 5 is positioning pin hole.

Embodiment

As Fig. 1, Fig. 2 and shown in Figure 3, a kind of piston of reciprocatable refrigerating equipment compressor, piston is by head 2, the skirt section 4 of head back is formed with the piston pin boss that is connected with connecting rod 3, head 2 is parts of piston head termination and fore-end and cylinder inner wall applying, the top is provided with salient point 1, has reduced clearance volume, has increased volumetric efficiency; Skirt section 4 is carried out grinding and is formed cylindroid on the basis of cylinder, its major semi axis radius is identical with the piston crown radius, the semi-minor axis radius is less than the piston crown radius, the effect in skirt section 4 be keep as far as possible piston in cylinder in the to-and-fro motion vertical steadily, the targeting part of piston just; Piston pin boss 3 is supporting portions that piston is connected with connecting rod by wrist pin.

The ratio of the utility model piston skirt semi-minor axis radius and piston crown radius can be adjusted as required, and scope should be between 0.94-1.

Claims

1. the piston of the compressor of a reciprocatable refrigerating equipment, comprise head, the skirt section of head back and the piston pin boss that is connected with connecting rod, head be with cylinder inner wall fit cylindrical, it is characterized in that: the profile in skirt section is by traditional cylindrical elliptical cylinder-shape that changes into.

2. according to the described compressor piston of claim 1, it is characterized in that: the skirt section is the 30%-50% of piston length overall near the side of head and the distance of piston crown end face.

3. according to the described compressor piston of claim 1, it is characterized in that: oval center and piston crown center are harmonious, and oval major semi axis radius is identical with the piston crown radius, and oval semi-minor axis radius is less than the piston crown radius, and both ratio is 0.94-1.