CN212536796U - Valve assembly and compressor - Google Patents

Abstract

The present disclosure provides a valve assembly and a compressor, the valve assembly including: the valve block comprises a retaining part and a limiting part which is configured to limit the displacement range of the valve block; and a mounting member configured to mount the valve sheet and the valve stop to the fixing member, the mounting member including a connecting portion extending through the first mounting hole and the second mounting hole and extending to the fixing member and a fastening portion provided against the valve stop, wherein a first distance from a boundary line of the holding portion and the limiting portion to a center plane of the second mounting hole is greater than a second distance from an effective fastening end portion of the fastening portion near the limiting portion to the center plane of the second mounting hole, the center plane of the second mounting hole extends through a center axis of the second mounting hole and is parallel to the boundary line, and the effective fastening end portion is an end portion of a portion of the fastening portion contacting the valve stop, which is farthest from the center plane. The valve assembly according to the present disclosure can reduce or eliminate wear of the valve sheet to improve reliability.

Description

Valve assembly and compressor

Technical Field

The present disclosure relates to a valve assembly and a compressor including the same.

Background

The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.

In order to improve the compression efficiency of the scroll compressor under the condition of low compression ratio, a check valve is usually installed at the exhaust port of the scroll assembly of the compressor to prevent the refrigerant gas with high temperature and high pressure from reversely flowing into the scroll assembly, thereby resulting in the repeated compression of the refrigerant gas. A check valve generally includes a valve block and a valve sheet disposed below the valve block, wherein the valve sheet can open or close a fluid through hole under the action of fluid pressure, and the valve block can be used to limit the displacement range of the valve sheet.

However, in practical use of the compressor, there are cases where the compressor efficiency is reduced or even fails to operate properly due to the failure of the check valve, and therefore it is required to provide a valve assembly with improved reliability.

SUMMERY OF THE UTILITY MODEL

It is an object of one or more embodiments of the present disclosure to provide a valve assembly that reduces or eliminates valve plate wear for high reliability.

According to an aspect of the present disclosure, there is provided a valve assembly mounted to a fixed member provided with a fluid through-hole, and including: the valve plate is configured to be located at an opening position for opening the fluid through hole and a closing position for closing the fluid through hole, and a first mounting hole is formed in the valve plate; a valve stopper including a retaining portion having a straight surface abutting against the valve sheet and a stopper portion configured to limit a displacement range of the valve sheet, the stopper portion having an inclined surface extending from the retaining portion away from the valve sheet, and the valve stopper being formed with a second mounting hole; and an installation member configured to install the valve sheet and the valve stop to the fixed member, the installation member including a connecting portion extending through the first and second mounting holes and extending to the fixed member and a fastening portion provided against the valve stop, characterized in that a first distance from a boundary line of the holding portion and the limiting portion to a center plane of the second mounting hole is larger than a second distance from an effective fastening end portion of the fastening portion near the limiting portion to the center plane of the second mounting hole, the center plane of the second mounting hole extending through a center axis of the second mounting hole and being parallel to the boundary line, the effective fastening end portion being an end portion of a portion of the fastening portion that is in contact with the valve stop, the end portion being farthest from the center plane.

According to an aspect of the present disclosure, the fastening portion includes a fastening head applying a fastening force to the valve stopper and the valve sheet, and a fastening gasket sandwiched between the fastening head and the valve stopper.

According to an aspect of the present disclosure, an end of a portion of the fastening washer that is in contact with the valve stopper, which is farthest from the central plane, serves as the effective fastening end.

According to an aspect of the present disclosure, the valve sheet includes a first valve sheet and a second valve sheet that are adjacently arranged, and the first valve sheet is disposed between the valve stopper and the second valve sheet, and the second valve sheet is disposed between the first valve sheet and the fixed member.

According to an aspect of the present disclosure, the holding portion is provided with a recess for accommodating the fastening portion.

According to an aspect of the present disclosure, the stopper portion extends from the holder portion in a first direction, and the holder portion is symmetrically provided with two pins in a second direction perpendicular to the first direction with respect to the second mounting hole, the pins passing through pin holes formed in the valve sheet to prevent the valve sheet from shifting.

According to an aspect of the present disclosure, the inclined surface of the stopper portion is formed as an arc-shaped inclined surface.

According to one aspect of the present disclosure, a ratio of the first distance to the second distance is less than 1.3.

According to another aspect of the present disclosure, there is provided a compressor including the above valve assembly.

According to another aspect of the present disclosure, the compressor is a scroll compressor including a compression mechanism adapted to compress a working fluid and a noise reduction cover adapted to separate an inner space of the scroll compressor into a non-high pressure region and a low pressure region, and the fixing member is installed at a through hole of the noise reduction cover or a discharge port of the scroll compressor, and the fluid through hole is in fluid communication with a central compression chamber of the compression mechanism.

Drawings

The features and advantages of one or more embodiments of the present disclosure will become more readily apparent from the following description taken in conjunction with the accompanying drawings. The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way, the drawings are not to scale, and some features may be exaggerated or minimized to show details of particular components. In the drawings:

fig. 1 is a sectional view schematically showing a scroll compressor to which a valve assembly according to a comparative example is applied;

fig. 2 and 3 are perspective views schematically showing a valve assembly according to a comparative example;

FIG. 4 is a cross-sectional view schematically illustrating a valve assembly according to a first embodiment of the present disclosure;

fig. 5a and 5b are schematic views illustrating wear analysis of a valve assembly according to a comparative example and a valve assembly according to a first embodiment of the present disclosure;

FIG. 6 is a cross-sectional view schematically illustrating a valve assembly according to a first embodiment of the present disclosure; and

FIG. 7 is a cross-sectional view schematically illustrating an alternative embodiment of a mount of a valve assembly according to the present disclosure.

Detailed Description

The following description of the various embodiments of the disclosure is merely exemplary in nature and is in no way intended to limit the disclosure, its application, or uses. The same reference numerals are used to designate the same components in the respective drawings, and thus the configurations of the same components will not be described repeatedly.

The basic configuration and principle of the scroll compressor 1 will be described below with reference to fig. 1.

As shown in fig. 1, the compressor 1 includes a substantially closed housing 20. The housing 20 may be composed of a generally cylindrical body portion 22, a top cover 24 provided at one end of the body portion 22, and a bottom cover 26 provided at the other end of the body portion 22. A partition plate 30 is provided between the top cover 24 and the body portion 22 to partition the inner space of the housing 20 into a low-pressure fluid suction chamber 21 and a high-pressure fluid discharge chamber 23. The space between the partition plate 30 and the top cover 24 constitutes the fluid discharge chamber 23, and the space between the partition plate 30, the body portion 22 and the bottom cover constitutes the fluid suction chamber 21. An intake joint for sucking fluid is provided at one side of the fluid suction chamber 21, and an exhaust joint for discharging compressed fluid is provided at one side of the fluid discharge chamber 23.

A compression mechanism and a drive mechanism for driving the compression mechanism are provided in the housing 20. The compression mechanism sucks fluid from the fluid suction chamber 21 of the housing 20 and discharges the fluid after compression into the fluid discharge chamber 23 of the housing 20. More specifically, referring to fig. 1, the compression mechanism may include, for example, a non-orbiting scroll 40 and an orbiting scroll 50. Orbiting scroll 50 includes an end plate 54 and a spiral wrap 56 formed on one side of the end plate. Non-orbiting scroll 40 includes an end plate 44 and a spiral wrap 46 formed on one side of the end plate, and end plate 44 includes a discharge port 42 formed at a substantially central position of the end plate. The wrap 46 of the non-orbiting scroll 40 and the wrap 56 of the orbiting scroll 50 are engaged with each other and constitute a series of compression pockets gradually decreasing in volume from a radially outer side to a radially inner side to compress fluid. The compressed fluid is sucked in through the compression chamber located at the radially outermost side, and the compressed fluid is discharged through the compression chamber located at the radially innermost side.

As shown in fig. 1, the working fluid compressed by the fixed scroll 40 and the orbiting scroll 50 flows toward the high-pressure fluid discharge chamber 23 through the discharge port 42 and the through hole of the partition plate (noise reduction cap) 30, and in order to prevent the working fluid on the high-pressure side from flowing back into the compression mechanism, a valve assembly 100 is provided at, for example, the through hole of the noise reduction cap 30 or adjacent and above the discharge port of the compression mechanism (see fig. 1, in a discharge space defined by the hub portion of the fixed scroll 40 on the upper side of the end plate 44 of the fixed scroll 40). The valve assembly 100 is configured to allow the working fluid in the compression chamber of the compression mechanism to flow to the high pressure side, but prevent the working fluid of the high pressure side from flowing back into the compression chamber.

As specifically shown in fig. 2, the valve assembly 100 according to the comparative example may include a valve sheet 110, a valve stopper 120, and a mounting member 130. The valve sheet 110 may include a first valve sheet 110a and a second valve sheet 110b arranged up and down, wherein the first valve sheet 110a may be disposed between the valve stop 120 and the second valve sheet 110b may be disposed between the first valve sheet 110a and the valve assembly fixing base 60. Referring to fig. 3, each valve sheet is formed with a fixed portion 112 and a movable portion 114, the movable portion 114 being configured to be movable relative to the fixed portion 112 to selectively open or close a fluid through hole provided at the fixing seat 60, and the fixed portion 112 may have a first mounting hole 116. A valve stopper 120 for limiting a displacement range of the valve sheet 110 is disposed above the valve sheet 110. The valve stopper 120 includes a holding portion 122 and a stopper portion 124 extending in a longitudinal direction (also referred to as a first direction) from the holding portion 122, wherein the holding portion 122 has a flat surface abutting against the valve sheet and the holding portion 122 has a second mounting hole 126, and the stopper portion 124 has an inclined surface extending from the holding portion away from the valve sheet 110. The mounting member 130 serves to mount the valve sheet 110 and the valve stopper 120 to the fixing base 60, and the mounting member 130 may include a connecting portion 132 and a fastening portion 134. The connecting portion 132 may extend through the first and second mounting holes 116 and 126 and be fixed to the fixing base 60. The fastening portion 134 includes a fastening head 136 applying a fastening force to the valve stop 120 and the valve sheet 110, and a fastening gasket 138 sandwiched between the fastening head 136 and the valve stop 120. In the example of fig. 3, mount 130 is illustratively shown as including a bolt and a fastening washer 138, where the bolt includes a connecting portion 132 and a fastening head 136. The holding part 122 may be provided with a recess for receiving the fastening part 134 to save an installation space of the valve assembly, and the holding part 122 is provided with two pins symmetrically about the second installation hole 126 in a lateral direction (also referred to as a second direction) perpendicular to the longitudinal direction, the pins passing through pin holes formed on the valve sheet to prevent the valve sheet from laterally shifting (e.g., laterally shifting due to rotation).

During operation of the compressor 1, working fluid is drawn into the compression mechanism and compressed as it flows from a radially outermost position to a radially innermost position, and the compressed fluid is discharged through the fluid passage hole. When the pressure of the fluid in the central compression chamber is greater than the pressure of the fluid in the discharge chamber 23, the pressure of the lower side of the valve plate 110 is greater than the pressure of the upper side, and the valve plate 110 moves toward the open position by the pressure difference, thereby allowing the fluid to be discharged through the fluid passage hole. When the pressure of the fluid contained in the central compression chamber is less than the pressure of the fluid in the discharge chamber 23, the valve sheet 110 returns to the closed position by the elastic restoring force and the pressure difference.

The inventors of the present application have found that the valve assembly 100 according to the comparative example is easily worn out of the valve sheet 110 when in use, and even breaks the valve sheet 110 in case of severe wear, so that the fluid passage hole fluidly communicating with the central compression chamber is always communicated with the high pressure side. In this case, the compressed working fluid flows back into the compression chamber from the high pressure side, so that the compressor repeatedly compresses the working fluid, which obviously adversely affects the compression efficiency.

In order to solve the above problems, the present disclosure contemplates an improved valve assembly that can effectively solve the problem of wear of a valve plate, thereby preventing the performance of a compressor from being affected by wear failure of the valve assembly.

The valve assembly according to the present disclosure and the compressor to which the valve assembly is applied will be described in further detail with reference to fig. 4 to 7.

Fig. 4 schematically shows a cross-sectional view of a valve assembly according to a first embodiment of the present disclosure.

As shown in fig. 4, the valve assembly 200 according to an exemplary embodiment of the present disclosure may be mounted to a fixing base 60 (corresponding to a fixing member according to the present disclosure) and may include a valve sheet 110, a valve stopper 220 having a second mounting hole 226, and a mounting member 130. The valve sheet and the mounting member of the valve assembly 200 according to the exemplary embodiment of the present disclosure are identical in structure and function to the corresponding components of the valve assembly 100 according to the comparative example, and thus, will not be described in detail.

The valve stop 220 of the valve assembly 200 according to the exemplary embodiment of the present disclosure is configured to limit the displacement range of the valve sheet 110 similarly to the valve stop 120 of the valve assembly 100 according to the comparative example and includes a holding part 222 and a stopper part 224, except that the holding part 222 of the valve stop 220 has an increased length compared to the holding part 122 of the valve stop 120. Hereinafter, it will be described in detail with reference to fig. 5a and 5 b.

The inventors of the present disclosure have found that the upper and lower valve sheets 110a and 110b of the valve sheet 110 reciprocate at the open position and the closed position when the compressor is operated. However, since the two valve sheets 110a and 110b are curved with different radii of curvature and, in addition, the influence of the working fluid, the two valve sheets cannot be completely opened and closed in synchronization, which inevitably results in a slight relative displacement between the movable portions of the two valve sheets. As shown in fig. 5a showing the valve assembly according to the comparative example, a straight line L extends through an intersection line (shown as an intersection point O in fig. 5 a) between the stopper portion 124 and the holding portion 122, and the straight line L is parallel to the center axis C of the second mounting hole, and at an intersection point F1 where the straight line L intersects the valve sheet 110, there is a relative displacement of the two valve sheets 110a and 110b due to asynchronous movement. Meanwhile, when the fastening portion 134 applies a fastening force to the valve stopper 120 and the valve sheet 110, an acting point of the fastening force on the valve sheet 110 is aligned with a position of the fastening portion 134 near an end (side end) E of the stopper portion 124. In the valve assembly 100 according to the comparative example, the distance B from the end E to the center axis C of the second mounting hole is equal to the distance a from the intersection O between the stopper portion 124 and the holding portion 122 to the center axis C, and at this time, the point of action of the fastening force on the valve sheet 110 is located exactly on the straight line L and coincides with the intersection F1. That is, at the intersection point F1, on the one hand, the valve plates 110a and 110b are subjected to a downward positive pressure force applied by the fastening portion 134, and on the other hand, there is a relative displacement of the valve plates 110a and 110b, which causes fretting wear of the valve plates, which is continuously accumulated when the valve plates are repeatedly opened and closed in response to the operation of the compressor, thereby damaging the valve plates or even completely breaking the valve plates, resulting in failure of the valve assembly. The boundary line between the limiting portion and the holding portion in this context refers to the boundary line of the limiting portion and the holding portion of the valve stop, i.e. the limiting portion and the holding portion are located on both sides of the boundary line O, which is shown as the intersection point O in the sectional view, and is bounded thereby.

To this end, the inventors in accordance with the present disclosure ingeniously contemplate a valve assembly 200 having an elongated retention portion 222. As shown in fig. 5B, since the holding portion 222 has an increased length with respect to the holding portion 122, a distance (first distance) a from an intersection O between the stopper portion 224 and the holding portion 222 to the central axis C is larger than a distance (second distance) B from an end (effective fastening end) E of the fastening portion 134 to the central axis C. In this case, when the fastening portion 134 applies the fastening force to the valve stopper 220 and the valve sheet 110, the point of application of the fastening force on the valve sheet 110 is aligned with the position of the end E and is misaligned with the straight line L. Thus, at the intersection point F1 where the straight line L intersects the valve sheet 110, there is only a relative displacement of the two valve sheets 110a and 110b due to the asynchronous movement, and there is no fastening force applied by the fastening portion 134. In this way, fretting wear of the valve plate 110 can be avoided, thereby improving reliability of the valve assembly and ensuring operating efficiency of the compressor. Preferably, distance a may be in the range of 1 to 1.3 times distance B (inclusive). Upon experimentation, the inventors have found that this ratio of distance a to distance B is effective in reducing and avoiding fretting wear and is beneficial in minimizing modification of the valve assembly for ease of manufacture and cost savings. In addition, through experiments, the applicant further found that when the distance a is in the range of 1.05 to 1.1 times the distance B, the effects of the aspects are more prominent. Here, it should be noted that the end E is also referred to herein as an effective fastening end of the fastening portion. That is, the effective fastening end refers to a side end of the fastening portion close to the stopper portion, and, in a case where the fastening portion is irregularly arranged (for example, the fastening portion is formed in a polygonal structure having a plurality of ends), the fastening end refers to an end farthest from a central plane passing through the central axis C and parallel to the boundary line O among the plurality of ends, and particularly, in a case where the fastening portion is also irregularly arranged in the vertical direction (for example, the fastening portion is formed in a structure wide at the top and narrow at the bottom), the effective fastening end refers to an end farthest from the central plane of a portion (i.e., a portion narrower at the bottom) where the fastening portion is in contact with the valve stop. It can be understood that the above-described end portion of the fastening portion that contacts the valve stop effectively functions to apply a fastening force to the retaining portion of the valve stop and the valve sheet. When the fastening portion includes both the fastening head and the fastening pad as shown in fig. 4, the end of the portion of the fastening pad that is in contact with the valve stop, which is farthest from the center plane, serves as an effective fastening end.

Fig. 6 shows a cross-sectional view of a valve assembly 300 according to a second embodiment of the present disclosure. The valve assembly 300 may include a valve plate 110, a valve stop 120, and a mounting member 330. The valve sheet and the valve stopper of the valve assembly 300 according to the second embodiment of the present disclosure are identical in structure and function to the corresponding components of the valve assembly 100 according to the comparative example, and thus will not be described in detail. Also, the mounting member 330 of the valve assembly 300 according to the second embodiment of the present disclosure includes a connection part 332 and a fastening part 334 similarly to the mounting member 130 of the valve assembly 100 according to the comparative example, wherein the connection part 332 may extend through the first and second mounting holes and be fixed to the fixing base 60, and the fastening part 334 includes a fastening head 336 applying a fastening force to the valve stop 120 and the valve sheet 110 and a fastening washer 338 clamped between the fastening head 336 and the valve stop 120, the mounting member 330 being different from the mounting member 130 in that the fastening washer 338 has a reduced radius compared to the fastening washer 138.

In the valve assembly 300 according to the second embodiment of the present disclosure, since the radius of the fastening washer 338 is reduced, the distance a from the intersection point O to the center axis C is greater than the distance B from the end E of the fastening washer 338 to the center axis C (in the present embodiment, the end E of the fastening washer 338 serves as an effective fastening end according to the present disclosure). At this time, when the fastening portion 334 applies the fastening force to the valve stopper 120 and the valve sheet 110, the point of application of the fastening force on the valve sheet 110 is aligned with the position of the end E of the fastening spacer 338 and is misaligned with the straight line L. Thus, at the intersection point F1 where the straight line L intersects the valve sheet 110, there is only a relative displacement of the two valve sheets 110a and 110b due to the asynchronous movement, and there is no fastening force applied by the fastening portion 334. In this way, fretting wear of the valve plate 110 can be avoided, thereby improving reliability of the valve assembly and ensuring operating efficiency of the compressor. It should be noted here that although in the first and second embodiments according to the present disclosure, the mount is exemplarily shown to include a bolt including the connecting portion and the fastening head and a fastening washer, the present disclosure is not limited thereto, and the mount 130' may also include a rivet and a fastening washer (as shown in fig. 7).

In the valve assembly 300 according to the second embodiment of the present disclosure, valve stop and mount standards may be utilized directly without modification, for example, bolt standards and smaller shim standards that mate with bolt standards of smaller dimensions may be utilized. In this way, a valve assembly with high reliability can be provided in a convenient and cost-effective manner.

Although the valve assembly 300 is exemplarily described as having the fastening washer 338 with a reduced radius according to the second embodiment of the present disclosure, it will be understood by those skilled in the art that the valve assembly may also have the fastening head 336 with a reduced radius, and the distance a from the intersection point O to the central axis C is greater than the distance B from the end of the fastening head 336 to the central axis C due to the reduced radius of the fastening head 336 (in this modification, the end of the fastening head serves as an effective fastening end according to the present disclosure). In this case, when the fastening portion 334 applies a fastening force to the valve stop 120 and the valve sheet 110, the point of application of the fastening force on the valve sheet 110 is aligned with the position of the end of the fastening head 336 and is offset from the straight line L. Thus, at the intersection point F1, there is only a relative displacement of the two valve sheets 110a and 110b due to the asynchronous movement, and there is no fastening force applied by the fastening portion 134. It is of course also possible to have both the fastening washer and the fastening head with a reduced radius, or even to have a portion of the fastening washer close to the valve stop with a reduced radius. Further, although in the exemplary embodiment according to the present disclosure, the mount is illustrated as including the fastening washer, the present disclosure is not limited thereto, and only the mount including the fastening head and the connection part may be used without the fastening washer.

Here, it should also be noted that it is described in the exemplary embodiment of the present disclosure that the valve sheet 110 includes two valve sheets 110a and 110b, but the present disclosure is not limited thereto, and the valve sheet 110 may be formed as a single valve sheet. In the case that the valve plate 110 is a single valve plate, because the valve plate 110 has relative displacement between the valve plate 110 and the valve stop above the valve plate in the opening and closing processes, fretting wear of the valve plate 110 may also occur, and the valve assembly according to the exemplary embodiment of the present disclosure may also solve the problem of wear of such a single valve plate. Of course, the valve assembly 200 may preferably include two valve sheets 110a and 110b, in which case, even if one valve sheet is damaged or broken, the other valve sheet can be used to selectively open or close the fluid passage hole. Therefore, the risk of failure of the valve assembly can be further reduced, and the working fluid is prevented from returning to the compression cavity, so that the working efficiency of the compressor is ensured.

Although various embodiments of the present disclosure have been described in detail herein, it is to be understood that the present disclosure is not limited to the particular embodiments described and illustrated in detail herein, and that other modifications and variations may be effected by one skilled in the art without departing from the spirit and scope of the present disclosure, for example, the valve assembly may be applied to compressors other than scroll compressors and to any other machine requiring a check valve other than a compressor. All such variations and modifications are intended to fall within the scope of the present disclosure. Moreover, all the components described herein may be replaced by other technically equivalent components.

Claims (10)

1. A valve assembly mounted to a stationary part provided with a fluid through-hole, and comprising:

the valve plate is configured to be located at an opening position for opening the fluid through hole and a closing position for closing the fluid through hole, and a first mounting hole is formed in the valve plate;

a valve stopper including a retaining portion having a straight surface abutting against the valve sheet and a stopper portion configured to limit a displacement range of the valve sheet, the stopper portion having an inclined surface extending from the retaining portion away from the valve sheet, and the valve stopper being formed with a second mounting hole; and

a mounting member configured to mount the valve sheet and the valve stop to the fixed member, the mounting member including a connecting portion extending through the first and second mounting holes and to the fixed member and a fastening portion provided against the valve stop,

the first distance from the boundary line of the holding portion and the limiting portion to the center plane of the second mounting hole is greater than the second distance from the effective fastening end portion of the fastening portion, which is the end portion of the fastening portion in contact with the valve stop, to the center plane of the second mounting hole, which extends through the center axis of the second mounting hole and is parallel to the boundary line, to the center plane of the second mounting hole, and the effective fastening end portion is the farthest end portion from the center plane.

2. The valve assembly of claim 1,

the fastening portion includes a fastening head and a fastening gasket, wherein the fastening head applies a fastening force to the valve stopper and the valve sheet, and the fastening gasket is sandwiched between the fastening head and the valve stopper.

3. The valve assembly of claim 2,

the end of the portion of the fastening washer that is in contact with the valve stop that is farthest from the central plane serves as the effective fastening end.

4. The valve assembly of claim 1,

the valve plate comprises a first valve plate and a second valve plate which are adjacently arranged, the first valve plate is arranged between the valve stop and the second valve plate, and the second valve plate is arranged between the first valve plate and the fixed part.

5. The valve assembly of claim 1,

the holding portion is provided with a recess for accommodating the fastening portion.

6. The valve assembly of claim 1,

the limiting portion extends from the retaining portion along a first direction, two pins are symmetrically arranged on the retaining portion in a second direction perpendicular to the first direction and relative to the second mounting hole, and the pins penetrate through pin holes formed in the valve plate to prevent the valve plate from shifting.

7. The valve assembly of claim 1,

the inclined surface of the stopper portion is formed as an arc-shaped inclined surface.

8. The valve assembly according to any one of claims 1-7,

a ratio of the first distance to the second distance is less than 1.3.

9. A compressor, characterized in that it comprises a valve assembly according to any one of claims 1-8.

10. The compressor of claim 9,

the compressor is a scroll compressor including a compression mechanism adapted to compress a working fluid and a sound-deadening cap adapted to separate an inner space of the scroll compressor into a non-high pressure region and a low pressure region, an

The fixing member is installed at a through hole of the noise reduction cover or a discharge port of the scroll compressor, and the fluid through hole is in fluid communication with a central compression chamber of the compression mechanism.

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