KR930007682Y1 - Piston ring of a compressor for a refrigerator - Google Patents

Abstract

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Description

Piston ring of compressor for freezer

1 is an exemplary view showing a cylinder of the compressor in cross section.

2a, b, c is an enlarged cross-sectional view of the conventional piston ring in line A.

Explanatory view of the sealing action of the conventional piston ring shown in Figure 3a, b, c or 2a.

4 is a half sectional view of a piston ring according to the present invention.

5 is an exemplary view of the use of the piston ring according to the present invention.

* Explanation of symbols for main parts of the drawings

R1, R2: Piston Ring S: Elastic Member

P: Piston G: Ring Groove

C: cylinder

The present invention relates to a piston ring of a compressor for a refrigerator.

In general, a compressor for a refrigerator uses a non-lubricating seal, unlike an internal combustion engine, because it compresses a refrigerant having chemical properties.

In other words, as shown in FIG. 1, one end is made into an open shape in order to maintain elasticity to expand in the circumferential direction so as to be in close contact with the inner wall of the cylinder C while being fitted to the piston P. Two rings (R1) and (R2) made of material are used as a set.

Conventional piston rings have two piston rings (R1), (R2) and expander ring (R3) together or two pistons to increase the expansion force in the circumferential direction as shown in Figs. 2a, b, c. The ring R1, R2 and the back-up ring R4 having both the expansion force and the contraction force in the circumferential direction have been used together by being held in the groove G of the piston P together.

The conventional piston ring as described above has the piston P as shown in FIGS. 3a, b, and c (typically only the example shown in FIG. 2a). When the frictional force acts in the same direction as the action of the compression force during the compression movement as shown in Fig. 3a, the piston P acts in the opposite direction during the expansion movement as shown in Fig. 3b.

At this time, if the frictional force acting in the opposite direction is larger than the expansion force, the rings R1 and R2 are made slightly larger than the rings R1 and R2 in consideration of assemblability, thermal expansion, and other processability. As a result of the phenomenon of moving in the ring groove (G) of the c), the refrigerant leaks through the free space (g) in the ring groove (G) as shown in FIG.

The present invention intensively examines the conventional problems as described above. As a result, when the frictional and expansion forces are applied in opposite directions during the expansion movement of the piston, the ring can be prevented from moving due to the difference between the frictional and expansion forces in the groove of the piston. In the case of knowing that the leakage of the refrigerant can be found to complete the present invention.

An object of the present invention is to insert a resilient member between a pair of piston rings fitted in the groove of the piston so that the piston rings can be in close contact with the groove of the piston in the vertical direction to offset the difference between the frictional force and the expansion force in the expansion stroke of the piston To provide a piston ring that can prevent the refrigerant from leaking into the groove of the piston for mounting the.

The present invention is described in more detail by the following illustrative drawings.

The present invention is made by installing an elastic member (S) having an elastic force in the vertical direction between a pair of piston rings (R1) and (R2) as illustrated in FIG.

The elastic member S is capable of holding the piston rings R1 and R2 up and down in addition to the "W" type leaf spring as illustrated, that is, if it can provide elasticity in the vertical direction, rubber material 0 You can also use a ring.

Referring to the effect of the present invention having such a structure as follows.

The present invention fits into the ring groove G of the piston P because the pair of piston rings R1 and R2 are carried by the elastic member S having elasticity in the vertical direction as illustrated in FIG. When the piston ring (R1) and (R2) is in close contact with the upper surface (G1) and the lower surface (G2) of the ring groove (G), respectively.

Therefore, the present invention, when the piston (P) ascending in the direction of the arrow (a) to compress the refrigerant and the pressure acting on the upper piston ring (R1), the frictional force with the cylinder (C) is greater than the elastic force of the elastic member (S) When it is lost, the refrigerant leaks between the piston ring R1 and the ring groove G1 and flows into the free space g in the ring groove G, but the lower piston ring R2 receives pressure, friction force and elastic force of the elastic member S together. ) Is closely contacted with the lower surface (G2) of the ring groove (G) with a large force to prevent leakage of the refrigerant.

When the piston P descends in the direction of the arrow b and expands the refrigerant, the leakage of the refrigerant is prevented by the elastic member S as in the compression stroke as described above.

The piston ring of the present invention as described above has the advantage that can effectively prevent the leakage of the refrigerant or the working fluid even if the piston (P) moves in any direction up and down, or the friction force with the cylinder (C) in any direction.

Claims (1)

Piston ring, characterized in that by installing an elastic member (S) having an elastic force in the vertical direction between a pair of piston ring (R1) and (R2).