JP2006342750A - Housing joining part seal structure for refrigerant compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a housing joining part seal structure which is provided in a joining part between a plurality of members constructing the housing of the refrigerant compressor and with which quantity of refrigerant gas leaking with permeating through an O-ring is little as compared with a conventional one. <P>SOLUTION: This housing joining part seal structure for the refrigerant compressor is provided with an O-ring, an O-ring groove storing the O-ring, and an O-ring holding part facing the O-ring groove and abutting on the O-ring and pressing the O-ring against the O-ring groove, and is provided in joining parts between a plurality of members constructing the housing of the refrigerant compressor. A groove facing the O-ring groove is formed on the O-ring holding part, a housing outer side surface of the O-ring groove and the housing outer side surface of the O-ring holding part form a flat surface and a section facing the groove of the O-ring holding part of the O-ring groove is raised. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a housing joint seal structure for a refrigerant compressor.

An O-ring, an O-ring groove that accommodates the O-ring, and an O-ring pressing portion that faces the O-ring and presses the O-ring against the O-ring groove are configured to constitute the housing of the refrigerant compressor. Patent Document 1 discloses a housing joint seal structure for a refrigerant compressor disposed at a joint between a plurality of members.
JP-A-9-042156

In the housing joint seal structure of the conventional refrigerant compressor of Patent Document 1 and the like, the O-ring pressing part forms a flat surface, and as shown in FIG. Since the curved portion faces the gap on the outside (outside of the housing) side of the housing joint, the O-ring surface is in contact with the gap over a wide area. There is a problem that the amount of refrigerant gas that passes through the ring and leaks out of the housing increases.

The present invention has been made in view of the above problems, and is an O-ring, an O-ring groove that accommodates the O-ring, and an O-ring that faces the O-ring groove and presses the O-ring against the O-ring groove. And a refrigerant joint through a O-ring as compared with the conventional one, wherein the refrigerant joint is provided at a joint between a plurality of members constituting a housing of the refrigerant compressor. An object of the present invention is to provide a housing joint seal structure with a small amount of permeation leakage.

In order to solve the above-described problem, in the present invention, an O-ring, an O-ring groove that accommodates the O-ring, and an O-ring presser that faces the O-ring groove and abuts the O-ring against the O-ring groove. And a housing joint seal structure for a refrigerant compressor disposed at a joint between a plurality of members constituting the housing of the refrigerant compressor, wherein the groove facing the O-ring groove is an O-ring presser The O-ring groove housing outer side surface and the O-ring holding portion groove housing outer side surface are flush with each other, and the portion facing the O-ring groove O-ring holding portion groove is raised. A housing joint seal structure for a refrigerant compressor is provided.
In the housing joint seal structure for a refrigerant compressor according to the present invention, a groove facing the O-ring groove is formed in the O-ring pressing portion, and the housing outer side surface of the O-ring groove and the housing outer side surface of the groove of the O-ring pressing portion. Since one side of the O-ring compressed and deformed into a substantially rectangular shape faces the gap on the outer side (outside of the housing) of the housing joint, the corner curved portion is the outer side surface and bottom surface of the groove of the O-ring holding portion. Opposite the corner of the intersection. As a result, the area of the O-ring surface in contact with the gap is reduced compared with the conventional technique in which the corner curved portion of the O-ring compressed and deformed into a substantially rectangular shape faces the gap, and the refrigerant gas permeates through the O-ring. The amount decreases.
In the housing joint seal structure according to the present invention, the portion of the O-ring groove facing the groove of the O-ring pressing part is raised, so that the O-ring has a compressive force equivalent to that of the conventional seal part structure. Join. As a result, the refrigerant gap leakage through the O-ring (leakage of refrigerant to the outside through the gap between the O-ring and the member in contact with the O-ring) is prevented as in the conventional case.
The extension area of the O-ring pressing groove in the housing inside / outside direction may be the same as or narrower than the extension area of the O-ring groove in the housing inside / outside direction, or may be smaller than the extension area of the O-ring groove in the housing inside / outside direction. May be wide.
The cross section of the groove of the O-ring holding part may be rectangular or triangular.

In a preferred aspect of the present invention, the extending region of the O-ring pressing portion groove in the housing inside / outside direction is narrower than the extending region of the O-ring groove in the housing inside / outside direction, and the depth of the O-ring pressing portion groove is outside the housing. It decreases continuously from the end toward the inner end of the housing.
When the extension region of the O-ring groove in the housing inside / outside direction is narrower than the extension region of the O-ring groove in the housing inside / outside, the depth of the groove of the O-ring holding portion is changed from the outer end of the housing to the housing. It is desirable to decrease continuously toward the inner end and make the groove cross-section triangular. When the cross section of the groove of the O-ring pressing portion is rectangular, the portion of the O-ring that contacts the O-ring pressing portion is discontinuously deformed, resulting in damage and deterioration of the O-ring. If the cross section of the groove of the O-ring pressing portion is triangular, the portion of the O-ring that contacts the O-ring pressing portion is continuously deformed, so that damage and deterioration of the O-ring can be suppressed.

In a preferred aspect of the present invention, the extending region of the O-ring pressing portion groove in the housing inside / outside direction is narrower than the extending region of the O-ring groove in the housing inside / outside direction, and the depth of the O-ring pressing portion groove is outside the housing. The depth continuously decreases from the end portion toward the inner end portion of the housing, and the depth of the bottom-up portion of the O-ring groove continuously increases from the outer end portion of the housing toward the inner end portion of the housing.
The extending region of the O-ring retainer groove in the housing inside / outside direction is made narrower than the extending region of the O-ring groove in the housing inside / outside direction, and the groove depth of the O-ring retaining portion is changed from the housing outer end to the housing inner end. In the case where the depth is continuously decreased, it is desirable that the depth of the bottom-up portion of the O-ring groove is continuously increased from the housing outer end toward the housing inner end.
Corresponding to the triangular cross section of the O-ring retainer groove, the O-ring groove is also raised to a triangular cross section, so that the distribution of compressive strain in the O-ring is uniform, and damage and deterioration of the O-ring are suppressed. Is done.

In the seal structure of the housing joint according to the present invention, a groove facing the O-ring groove is formed in the O-ring pressing part, and the housing outer side surface of the O-ring groove and the housing outer side surface of the groove of the O-ring pressing part are surfaces. Therefore, one side of the O-ring that has been compressed and deformed into a substantially rectangular shape faces the gap on the outside (outside of the housing) side of the housing joint, and the curved corner is the intersection of the outer side surface of the O-ring holding groove and the bottom surface. Confront the corner. As a result, the area of the O-ring surface in contact with the gap is reduced compared to the conventional technique in which the corner curved portion of the O-ring compressed and deformed into a substantially rectangular shape faces the gap, and the refrigerant gas permeates through the O-ring. The amount decreases.

A seal structure of a housing joint according to an embodiment of the present invention will be described.

As shown in FIG. 2, the peripheral walls 1 and 2 of the cylindrical body constituting the housing of the compressor for compressing the refrigerant are pressed and joined to each other by a through bolt (not shown) in a state where the end faces are abutted. One surfaces 1a and 2a of the peripheral walls 1 and 2 are inner surfaces facing a compression mechanism (not shown) housed in the housing, and the other surfaces 1b and 2b are outer surfaces facing the outside.
An O-ring 3 made of a polymer material such as rubber is disposed at the joint between the peripheral walls 1 and 2. The O-ring 3 is accommodated in an annular O-ring groove 4 formed on the end surface of the peripheral wall 1.
The end surface of the peripheral wall 2 forms an O-ring pressing portion 5 that faces the O-ring groove 4 and contacts the O-ring 3 to press the O-ring 3 against the bottom surface of the O-ring groove 4. A groove 6 facing the O-ring groove 4 is formed in the O-ring pressing portion 5. The housing outer side surface 4a of the O-ring groove 4 and the housing outer side surface 6a of the groove 6 of the O-ring pressing portion are flush with each other. The part of the O-ring groove 4 that faces the groove 6 of the O-ring pressing part is raised.
The extension region of the groove 6 of the O-ring pressing part in the housing inside / outside direction is narrower than the extension region of the O-ring groove 4 in the housing inside / outside direction, and the depth of the groove 6 of the O-ring pressing part is from the outer end of the housing. It continuously decreases toward the inner end of the housing. As a result, the cross section of the groove 6 of the O-ring pressing portion forms a triangle.
The depth of the raised portion of the O-ring groove 4 continuously increases from the housing outer end toward the housing inner end. As a result, the O-ring groove 4 is raised to a triangular cross section.

In the housing joint seal structure according to the present embodiment, a groove 6 facing the O-ring groove 4 is formed in the O-ring pressing part 5, and the housing outer side surface 4a of the O-ring groove 4 and the groove 6 of the O-ring pressing part are formed. Since it is flush with the housing outer side surface 6a, as can be seen from FIG. 2, one side of the O-ring 3 which is compressed and deformed into a substantially rectangular shape and is pressed to the outside by receiving a high pressure in the housing is the housing joint housing. The corner curved portion of the O-ring 3 is opposed to the intersection corner between the housing outer side surface 6a and the bottom surface 6b of the groove 6 of the O-ring pressing portion. As a result, the area in contact with the gap S on the surface of the O-ring is reduced as compared with the conventional technique in which the corner curved portion of the O-ring 3 compressed and deformed into a substantially rectangular shape faces the gap S, and the refrigerant passing through the O-ring 4 is reduced. The amount of gas permeation leakage (the amount of refrigerant gas that permeates through the O-ring 4 and leaks out of the housing) is reduced.
In the housing joint seal structure according to the present embodiment, the portion of the O-ring groove 4 that faces the groove 6 of the O-ring pressing part is raised, so that the O-ring 3 has the same structure as the conventional seal part structure. Compression force is applied. As a result, gap leakage of the refrigerant through the O-ring 3 (leakage of refrigerant to the outside through the gap between the O-ring 3 and the member in contact with the O-ring 3) is prevented in the same manner as before.

The extending region of the O-ring pressing portion groove 6 in the housing inside / outside direction may be the same as or narrower than the extending region of the O-ring groove 4 in the housing inside / outside direction, or the O-ring groove 4 extends in the housing inside / outside direction. However, when the O-ring groove 4 is narrower than the extending region in the housing inside / outside as in the present embodiment, the depth of the groove 6 of the O-ring pressing portion is set to the outer end of the housing. It is desirable that the groove 6 is continuously reduced from the portion 6a toward the housing inner end portion 6c so that the cross section of the groove 6 is triangular. When the cross section of the groove 6 of the O-ring pressing portion is rectangular, the portion of the O-ring 3 that contacts the O-ring pressing portion 5 is discontinuously deformed, causing damage and deterioration of the O-ring 3. If the cross section of the groove 6 of the O-ring pressing portion is triangular, the portion of the O-ring 3 that contacts the O-ring pressing portion 5 is continuously deformed, so that damage and deterioration of the O-ring 3 can be suppressed.

The extending region of the groove 6 of the O-ring pressing part in the housing inside / outside direction is made narrower than the extending region of the O-ring groove 4 in the housing inside / outside direction, and the depth of the groove 6 of the O-ring pressing part is made from the housing outer end 6a. When continuously decreasing toward the housing inner end 6c, it is desirable to continuously increase the depth of the bottom-up portion of the O-ring groove 4 from the housing outer end 4a toward the housing inner end 4b. . Corresponding to making the cross-section of the groove 6 of the O-ring holding part triangular, the O-ring groove 4 is also raised to a triangular cross-section, so that the distribution of compressive strain of the O-ring 3 is made uniform and the O-ring 3 is damaged. Deterioration is suppressed.

In the first embodiment, the extending area of the groove 6 of the O-ring pressing portion in the housing inside / outside direction is made narrower than the extending area of the O ring groove 4 in the housing inside / outside direction. However, as shown in FIG. May be. The cross section of the groove 6 may be a rectangle as shown by a solid line, a trapezoid as shown by a one-dot chain line, or a triangle as shown by a two-dot chain line. When the cross section of the groove 6 is rectangular, it is desirable that the O ring groove 4 is also raised to the rectangular cross section so that the compressive strain distribution of the O ring 3 is uniform, and when the cross section of the groove 6 is trapezoidal, the O ring. It is desirable that the groove 4 is also raised to a trapezoidal cross section so that the compressive strain distribution of the O-ring 3 is uniform, and when the groove 6 has a triangular cross section, the O-ring groove 4 is also raised to a triangular cross section and the O-ring 3 It is desirable to make the compressive strain distribution uniform.

The present invention is widely applicable to housing joints of various refrigerant compressors.

It is sectional drawing of the housing junction part seal structure of the conventional refrigerant compressor. It is sectional drawing of the housing junction part seal structure of the refrigerant compressor which concerns on the Example of this invention. It is sectional drawing of the housing junction part seal structure of the refrigerant compressor which concerns on the Example of this invention.

Explanation of symbols

1, 2 Peripheral walls 1a, 2a Inner surface 1b, 2b Outer surface 3 O-ring 4 O-ring groove 5 O-ring retainer 6 Groove S Gap

Claims (3)

An O-ring, an O-ring groove that accommodates the O-ring, and an O-ring pressing portion that faces the O-ring and presses the O-ring against the O-ring groove are configured to constitute a housing of the refrigerant compressor. A housing joint seal structure for a refrigerant compressor disposed at a joint between a plurality of members, wherein a groove facing the O-ring groove is formed in the O-ring pressing portion, and the housing outer side surface of the O-ring groove A housing joint seal structure for a refrigerant compressor, wherein the groove of the O-ring pressing portion is flush with the outer side surface of the housing, and a portion of the O-ring groove facing the groove of the O-ring pressing portion is raised. . The extending region of the O-ring holding portion groove in the housing inside / outside direction is narrower than the extending region of the O-ring groove in the housing inside / outside direction, and the depth of the O-ring holding portion groove is from the housing outer end to the housing inner end. The housing joint seal structure for a refrigerant compressor according to claim 1, wherein the housing joint seal structure decreases continuously. The housing joint seal structure for a refrigerant compressor according to claim 2, wherein the depth of the bottom-up portion of the O-ring groove continuously increases from the housing outer end toward the housing inner end.

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