Valve assembly for scroll compressor and scroll compressor

Abstract

The utility model relates to a valve assembly for a scroll compressor and the scroll compressor. The scroll compressor comprises a fixed scroll plate, the fixed scroll plate comprises a fixed scroll plate end plate and an exhaust port, and the valve assembly comprises a valve plate, a valve plate and a valve supporting seat. And at least one valve hole is formed in the valve plate. The valve supporting seat is arranged below the valve plate in the axial direction, a transition cavity extending in the axial direction in a penetrating mode is formed in the valve supporting seat, and the valve supporting seat is designed to be capable of freely rotating in the circumferential direction relative to the fixed scroll plate end plate after the valve assembly is assembled to the fixed scroll plate end plate; and the valve supporting seat is configured to allow the exhaust port to be in fluid communication with each valve hole by means of the transition cavity when the valve supporting seat rotates to any position in the circumferential direction relative to the fixed scroll plate end plate. The assembly complexity of the valve assembly is reduced and the installation reliability is improved by the valve group with the above configuration.

Description

TECHNICAL FIELD

[0001] The utility model relates to a valve assembly, in particular to a valve assembly for a scroll compressor. BACKGROUND

[0002] This section provides background information related to the utility model and is not necessarily prior art.

[0003] Scroll compressors can be used in, for example, refrigeration systems, air conditioning systems, and heat pump systems. Scroll compressors generally include a housing, an electric motor, a drive shaft, a fixed scroll, and an orbiting scroll. The fixed scroll and the orbiting scroll form a compression mechanism suitable for compressing a working fluid, such as a refrigerant. The fixed scroll includes a fixed scroll end plate, a fixed scroll wrap, and a discharge port formed in the fixed scroll end plate. In addition, the fixed scroll can include a hub portion, and the discharge port in the fixed scroll end plate is located within a range surrounded by the hub portion. A valve assembly is provided at the discharge port in the fixed scroll end plate to control the opening and closing of the discharge port.

[0004] In the prior art, the valve assembly is usually attached to the fixed scroll end plate by means of a pin, and a pin hole is formed in the fixed scroll end plate for the pin to be inserted therein. When assembling the valve assembly, the operator needs to manually insert the pin into the pin hole, and further determine whether the pin is installed in place by whether the valve assembly can be rotated circumferentially under manual operation. However, manual operation and control will increase the workload of the operation site, and even if the valve assembly is artificially judged to be unable to rotate circumferentially relative to the fixed scroll end plate by manual operation and control, there is still a risk that the pin may not be installed in place due to inaccurate judgment. In addition, the prior art has the phenomenon that the valve plate closes too fast, which affects the fatigue life of the valve plate. Therefore, the valve assembly in the prior art still has room for improvement. SUMMARY

[0005] The utility model aims at solving one technical problem of reducing the assembly complexity of the valve assembly, and improving the installation reliability of the valve assembly. The utility model aims at solving another technical problem of reducing the pressure difference between the two ends of the valve plate at the moment when the valve plate is closed, thereby reducing the closing speed of the valve plate and improving the fatigue life of the valve plate.

[0006] The utility model provides a valve subassembly for scroll compressor, the scroll compressor includes fixed scroll disc, the fixed scroll disc includes fixed scroll disc end plate and the exhaust port of volume V1 being set up on the fixed scroll disc end plate, the valve subassembly includes valve plate, valve piece and valve support seat. At least one valve hole is set up on the valve plate. The valve piece is arranged above the axial direction of the valve plate and is structured to selectively open and close the valve hole. The valve support seat is arranged below the axial direction of the valve plate, an axial through -going transition cavity is set up in the valve support seat, and the valve support seat is structured such that, after the valve subassembly is assembled to the fixed scroll disc end plate, the valve support seat can rotate freely in the circumferential direction relative to the fixed scroll disc end plate, and the valve support seat allows the exhaust port and the valve hole to remain in fluid communication through the transition cavity when the valve support seat is rotated in the circumferential direction to any position relative to the fixed scroll disc end plate.

[0007] The valve subassembly with the above configuration achieves the following technical effects:

[0008] 1. The valve subassembly can be assembled externally to the scroll compressor first, and then assembled to the fixed scroll disc end plate. The external operation space is large, which is convenient for the operator to assemble and is not prone to errors.

[0009] 2. Since the valve subassembly can normally perform functions regardless of the circumferential position of the valve subassembly relative to the fixed scroll disc end plate, i.e., allowing fluid to enter the valve hole from the exhaust port through the transition cavity of the valve support seat, the circumferential positioning of the valve subassembly relative to the fixed scroll disc end plate does not need to be considered during assembly of the valve subassembly to the fixed scroll disc end plate, which simplifies the assembly process.

[0010] 3. Since there is no longer a problem of whether the valve subassembly and the fixed scroll disc end plate are successfully attached compared to the prior art, the processing process is further simplified and the reliability of assembly and installation is improved.

[0011] Preferably, the transition cavity has an upper shaft port and a lower shaft port, and the lower shaft port is designed to completely cover the exhaust port when the valve support seat is rotated in the circumferential direction to any position relative to the fixed scroll disc end plate. Through this design, the smoothness of fluid flow is improved to avoid the increase of fluid flow resistance.

[0012] Preferably, the upper shaft port is designed to completely cover each valve hole when the valve subassembly is assembled together, or to completely cover each valve hole when the valve support seat is rotated in the circumferential direction to any position relative to the fixed scroll disc end plate. Through this design, the smoothness of fluid flow is further improved as a whole to avoid the increase of fluid flow resistance.

[0013] Preferably, the transition cavity has a volume V2, wherein V2 is greater than V1.

[0014] By this design, the valve plate is buffered when the valve plate is closed, thereby reducing the pressure difference at both ends of the valve plate at the moment when the valve plate is closed, reducing the closing speed of the valve plate and correspondingly reducing the force of the valve plate hitting the valve plate, thereby improving the fatigue life of the valve plate.

[0015] Preferably, the transition cavity is centrally formed with respect to the valve support seat.

[0016] Preferably, the transition cavity is designed in the shape of a rotary body with the axis of the valve support seat as the axis of rotation.

[0017] Preferably, the transition cavity is designed in the shape of a cylinder.

[0018] By this design, the valve assembly disclosed in the utility model has enhanced versatility between different scroll compressors.

[0019] Preferably, the valve assembly is configured to further include a valve stop and an attachment mechanism, the valve stop, the valve plate, the valve plate and the valve support seat can be connected together in sequence in the axial direction by means of the attachment mechanism, so that the valve support seat cannot rotate circumferentially with respect to the valve plate. Through this configuration, each component can be connected into an assembly in advance and the relative circumferential rotation between each component is limited, thereby further improving the installation convenience and avoiding friction or even causing the valve assembly to be unable to work due to relative rotation between each component.

[0020] Preferably, the attachment mechanism includes at least two pins, and at least two mounting holes are formed on the upper end surface of the valve support seat for one-to-one insertion of the at least two pins. Through this configuration, the mounting hole can simply replace the blind hole on the fixed scroll end plate in the original product, thereby easily realizing the new valve assembly according to the utility model on the basis of the valve assembly that has been mass-produced.

[0021] Preferably, the valve plate and the valve support seat are configured as an integral piece. Through this configuration, the number of components is reduced, thereby making manufacturing and installation more convenient from another aspect.

[0022] The utility model also provides a scroll compressor, which comprises the valve assembly.

[0023] Preferably, the fixed scroll further comprises a hub portion extending from the fixed scroll end plate, and the valve assembly further comprises an axial limiting mechanism configured to install the valve assembly in the hub portion in a manner of being fixed in place in the axial direction with respect to the fixed scroll end plate. BRIEF DESCRIPTION OF DRAWINGS

[0024] The foregoing and other features and characteristics of this application will become clearer from the following detailed description with reference to the accompanying drawings, which are merely illustrative and not necessarily drawn to scale. The same reference numerals are used in the drawings to indicate the same parts, in which:

[0025] Figure 1 An assembly diagram of the valve assembly according to the present invention on a fixed scroll plate is shown.

[0026] Figure 2 An exploded view of the valve assembly according to the present invention is shown.

[0027] Figure 3 A three-dimensional schematic diagram of the valve support seat is shown.

[0028] Figure 4 A cross-sectional view of the valve support is shown, taken along an arbitrary diameter direction.

[0029] Figure 5 A three-dimensional schematic diagram is shown when the valve plate and valve support are integrated as a single unit.

[0030] Figure 6 It shows along Figure 5 A cross-sectional view taken along the centerline AA.

[0031] Reference number list

[0032] 100. Valve assembly; 200. Fixed scroll plate end plate; 300. Exhaust port; 400. Hub; 1. Valve plate; 11. Valve hole; 2. Valve support seat; 21. Transition chamber; 211. Upper shaft port of transition chamber; 212. Lower shaft port of transition chamber; 22. First mounting blind hole; 23. Second mounting blind hole; 3. Valve stop; 41. First pin; 42. Second pin; 5. Wave spring; 6. Valve disc. Detailed Implementation

[0033] Now we will combine Figures 1 to 6 The preferred embodiments of this utility model will be described in detail below. The following description is exemplary in nature and is not intended to limit the utility model or its application or use.

[0034] Certain directional terms used herein (including the claims) should be understood to have their normal meaning and refer to those directions as understood when normally observing the drawings, but not necessarily the orientation of the device in actual use. Specifically, "axial" and "radial" respectively refer to Figure 1 The directions indicated by "L" and "R" are "up" and "down". Figure 1"axial upper side" in the case of a vertical scroll compressor corresponds to "axial left side" or "axial right side".

[0035] Figure 1 An assembly schematic of the valve assembly 100 according to the present utility model on the fixed scroll plate 200 is shown in FIG. 2, in which it can be seen that the valve assembly 100 is arranged axially above the exhaust port 300. Figure 2 An exploded schematic of the valve assembly 100 according to the present utility model is shown in FIG. 3. The valve assembly 100 according to the present utility model comprises an axial limiting mechanism, a valve stop 3, a valve sheet 6 and a valve plate 1. The valve sheet 6 is arranged axially above the valve plate 1, specifically clamped between the valve stop 3 and the valve plate 1. The valve plate 1 is provided with a valve hole 11, and it should be understood by those skilled in the art that although one valve hole 11 is shown in the valve plate 1 herein, more valve holes 11 can be provided in the valve plate 1 according to the specific arrangement of the exhaust port 300 and actual use needs. The valve cover part of the valve sheet 6 can be correspondingly arranged above each valve hole 11 and selectively open and close the corresponding valve hole 11. The valve sheet 6 is a resilient member and covers the valve hole 11 in the normal state, and when the valve sheet 6 is subjected to an external force of a certain size, the valve sheet 6 can be elastically deformed away from the valve hole 11. The valve stop 3 is arranged axially above the valve sheet 6 to limit the distance of the valve sheet 6 away from the valve hole 11. The valve sheet 6 is arranged axially above the valve stop 3, and the valve stop 3 is arranged axially above the valve plate 1. Figure 1 In FIG. 4, the valve sheet 6 is not shown, and the valve sheet 6 is arranged between the valve stop 3 and the valve plate 1. Figure 2 In FIG. 4, the valve sheet 6 is not shown, and the valve sheet 6 is arranged between the valve stop 3 and the valve plate 1.

[0036] The axial limiting mechanism is designed to abut to the upper end face of the valve stop 3 in the axial direction to limit the axial displacement of the valve stop 3 and the components below the valve stop 3 relative to the fixed scroll plate. The axial limiting mechanism can adopt a wave spring 5 as shown in detail in FIG. 5, which can be inserted into the groove provided in the inner circumferential surface of the hub 400 as shown in FIG. 6. The axial limiting mechanism can also adopt a fastening nut (not shown herein) and the like. Figure 2 Figure 1 Further referring to FIGS. 7 and 8, the valve assembly 100 according to the present utility model further comprises a valve support seat 2 arranged below the valve plate 1, which will be positioned in close proximity to the exhaust port 300 after the valve assembly 100 is assembled to the fixed scroll plate 200, i.e. the valve support seat 2 will be clamped between the valve plate 1 and the exhaust port 300, so that the fluid flowing out of the exhaust port 300 needs to first pass through the valve support seat 2 to enter the valve hole 11 of the valve plate 1.

[0037] Further referring to FIGS. 7 and 8, the valve assembly 100 according to the present utility model further comprises a valve support seat 2 arranged below the valve plate 1, which will be positioned in close proximity to the exhaust port 300 after the valve assembly 100 is assembled to the fixed scroll plate 200, i.e. the valve support seat 2 will be clamped between the valve plate 1 and the exhaust port 300, so that the fluid flowing out of the exhaust port 300 needs to first pass through the valve support seat 2 to enter the valve hole 11 of the valve plate 1. Figure 3 Figure 4 Further referring to FIGS. 7 and 8, the valve assembly 100 according to the present utility model further comprises a valve support seat 2 arranged below the valve plate 1, which will be positioned in close proximity to the exhaust port 300 after the valve assembly 100 is assembled to the fixed scroll plate 200, i.e. the valve support seat 2 will be clamped between the valve plate 1 and the exhaust port 300, so that the fluid flowing out of the exhaust port 300 needs to first pass through the valve support seat 2 to enter the valve hole 11 of the valve plate 1.

[0038] ​​In the present application, the valve support seat 2 can be designed to be arranged axially below the valve plate 1 without being able to rotate circumferentially relative to the valve plate 1. Specifically, the valve assembly 100 further comprises an attachment mechanism capable of connecting the four components of the valve stop 3, the valve vane 6, the valve plate 1 and the valve support seat 2 together in sequence from top to bottom in the axial direction. In a preferred example, as shown in Figure 2 the attachment mechanism comprises a first pin 41 and a second pin 42, which pass through the valve stop 3, the valve vane 6, the valve plate 1 and the valve support seat 2 in sequence in the axial direction to connect the four together in the axial direction. When connected with the first pin 41 and the second pin 42, a first mounting blind hole (corresponding to the mounting hole according to the present application) 22 and a second mounting blind hole (corresponding to the mounting hole according to the present application) 23 are provided on the upper end surface of the valve support seat 2, wherein the first mounting blind hole 22 is for the first pin 41 to be inserted therein, and the second mounting blind hole 23 is for the second pin 42 to be inserted therein. It should be noted here that, for the sake of simplifying processing, the holes on the valve support seat 2 for corresponding the first pin 41 and the second pin 42 can also be mounting through holes (which can also correspond to the mounting hole according to the present application), but the length of the pin and / or the through hole should be reasonably designed so that the first pin 41 and the second pin 42 do not protrude from the lower end surface of the valve support seat 2. In addition, those skilled in the art should understand that the attachment mechanism can also alternatively or additionally take other forms (such as a plurality of adhesive members), or the attachment mechanism comprises more pins, wherein in the case where the attachment mechanism comprises more pins, more mounting blind holes or mounting through holes are also needed to be provided on the upper end surface of the valve support seat 2 for the pins to be inserted therein one by one.

[0039] As analyzed above, since the first pin 41 and the second pin 42 do not protrude from the lower end surface of the valve support seat 2 after being inserted into the corresponding mounting blind holes or mounting through holes, the first pin 41 and the second pin 42 do not play any connecting role between the valve plate 1 and the fixed scroll end plate 200, that is, the first pin 41 and the second pin 42 do not hinder the movement of the valve support seat 2 relative to the fixed scroll end plate 200. At the same time, in the present application, no other connecting mechanism is provided to connect the valve support seat 2 with the fixed scroll end plate 200. Thus, after the valve assembly 100 is assembled to the fixed scroll end plate 200, the valve support seat 2 can freely rotate circumferentially relative to the fixed scroll end plate 200. Since the valve stop 3, the valve vane 6 and the valve plate 1 are connected with the valve support seat 2 by means of the attachment mechanism described above to form an assembly (in which the components cannot rotate circumferentially relative to each other), after the valve assembly 100 is assembled to the fixed scroll end plate 200, all the components in the valve assembly 100 except for the axial limiting mechanism can freely rotate circumferentially relative to the fixed scroll end plate 200 as an assembly.

[0040] In order to enable the fluid flowing out of the exhaust port 300 to pass through the valve support 2 into the valve hole 11, a transition cavity 21 extending through from the upper end surface to the lower end surface of the valve support 2 is formed in the valve support 2, wherein the transition cavity 21 comprises an upper axial port 211 and a lower axial port 212 opposite to each other in the axial direction, and each valve hole 11 on the valve plate 1 can be in fluid communication with the exhaust port 300 by means of the transition cavity 21.

[0041] In the case that the valve support 2 can rotate relative to the fixed scroll end plate 200 in the circumferential direction but cannot rotate relative to the valve plate 1 in the circumferential direction, in order to ensure that the fluid flowing out of the exhaust port 300 can pass through the valve support 2 into the valve hole 11 when the valve support 2 is rotated relative to the fixed scroll end plate 200 to any circumferential position, the relative position of the upper axial port 211 of the transition cavity 21 to the valve hole 11 and the relative position of the lower axial port 212 to the exhaust port 300 need to be further defined.

[0042] Specifically, the size and shape of the lower axial port 212 are designed such that the lower axial port 212 can be in fluid communication with the exhaust port 300 when the valve support 2 is rotated relative to the fixed scroll end plate 200 to any circumferential position. To achieve this purpose, the lower axial port 212 should be able to cover at least a part of the exhaust port 300 when the valve support 2 is rotated relative to the fixed scroll end plate 200 to any circumferential position. Preferably, the lower axial port 212 can completely cover the entire exhaust port 300 regardless of the circumferential position of the valve support 2 relative to the fixed scroll end plate 200, so as to achieve a larger flow area.

[0043] Since the valve plate 1 and the valve support 2 cannot rotate relative to each other in the circumferential direction, in order to achieve the communication, after the valve plate 1 is assembled to the valve support 2, the upper axial port 211 only needs to be able to cover at least a part of each valve hole 11 to meet the requirement. Preferably, the upper axial port 211 can completely cover each valve hole 11 to achieve a larger flow area. Here, in order to prevent the valve plate 1 and the valve support 2 from being axially displaced undesirably and affecting the process of the fluid entering the valve plate 1 from the transition cavity 21, see Figure 5 and 6 In the present application, the valve plate 1 and the valve support 2 can also be designed as an integral piece, so that the relative position of the transition cavity 21 to the valve hole 11 will always remain unchanged.

[0044] As can be seen from the above description, regardless of the circumferential angle at which the valve assembly having the above configuration is arranged relative to the fixed scroll end plate, the valve assembly can achieve the function of enabling the fluid flowing out of the exhaust port 300 to pass through the valve support 2 into the valve hole 11, in which case the circumferential angle positioning of the valve assembly relative to the fixed scroll end plate does not need to be considered during the assembly of the valve assembly.

[0045] The valve assembly 100 with the above configuration is assembled to the fixed scroll end plate 200 as follows. First, the valve block 3, the valve plate 6, the valve plate 1 and the valve support seat 2 are assembled into an assembly outside the scroll compressor by means of the attachment mechanism; next, the above four components (i.e. the assembly) are accommodated in the hub 400 without connecting the assembly to the fixed scroll end plate; finally, the wave spring 5 is inserted into the groove in the inner circumferential surface of the hub 400. It can be seen that the valve assembly disclosed in the utility model is simple to assemble, thereby simplifying the assembly process, and the installation reliability of the valve assembly 100 is also improved because the exhaust port and the valve hole are connected via the transition hole regardless of the circumferential positioning of the assembly.

[0046] Further, referring back to Figure 1 In this document, the volume of the exhaust port 300 is referred to as V1, the pressure in the exhaust port 300 is referred to as P1, the volume of the transition cavity 21 is referred to as V2, the pressure in the transition cavity 21 is referred to as P2, the volume of the compression chamber below the exhaust port 300 during exhaust is referred to as V3, and the pressure in the compression chamber is referred to as P3, and the pressure above the valve plate 6 is referred to as Pd.

[0047] In this document, V2 can be designed to be greater than V1. In combination with Figure 1 The beneficial effects of this design are described. Specifically, during operation of the compressor, when P2 is greater than Pd by a certain value, the valve plate 6 opens. At the moment when the valve plate 6 closes, the pressure P below the valve plate 6 is determined as follows:

[0048] P = (P2*V2 + P1*V1 + P3*V3) / (V1 + V2 + V3).

[0049] At the moment when the valve plate 6 closes, since the valve plate 6 has not yet completely closed, the transition cavity 21 still remains in fluid communication with the high-pressure region above, so P2 in the formula will increase, but since V1, V2 and V3 do not change, the value of P will increase, which will reduce the difference between Pd and P, i.e. reduce the pressure difference on both sides of the valve plate 6. In other words, the existence of the transition cavity 21 is equivalent to adding a cavity below the valve plate 6 that can store high pressure at the moment of closing. When the valve plate 6 closes, a downward thrust will be applied to the gas in the transition cavity 21, and since the lower passage is fixed, there is no way to quickly unload the gas pressure, causing the pressure below the valve plate 6 to rise, thereby reducing the pressure difference above and below the valve plate 6. By effectively reducing the pressure difference above and below the valve plate 6, the closing speed of the valve plate 6 can be reduced, and the force of the valve plate impacting the valve plate can be correspondingly reduced, and similarly the stress on the valve plate is smaller, thereby further improving the fatigue life of the valve plate 6.

[0050] Further, since the valve support seat 2 can be a separate detachable component, the valve assembly according to the present application can be easily realized by only adding the valve support seat 2 having the above configuration on the basis of the valve assembly 100 which has been mass-produced. In the valve assembly according to the present application, the pin originally inserted into the end plate 200 of the fixed scroll is inserted into the hole of the valve support seat 2. This way is low in cost, flexible in manufacturing and operation, and does not greatly affect (or even does not affect) the configuration of the existing valve assembly.

[0051] Since the positions of the exhaust ports 300 of different compressors can be designed differently, in order to make the valve support seat 2 better applicable to different scroll compressors, in addition to the design that the upper shaft port 211 of the transition cavity 21 partially or completely covers each valve hole 11 and the lower shaft port 212 partially or completely covers the exhaust port 300 at any circumferential position, the transition cavity 21 can also be designed to be centrally formed with respect to the valve support seat 2. The transition cavity 21 is preferably in the shape of a rotary body with the axis of the valve support seat 2 as the rotary axis, such as a cylinder, a truncated cone or a partial spherical shape. In this regard, as shown in Figure 3 and Figure 4 the transition cavity 21 is particularly preferably designed in the shape of a cylinder in consideration of the machining characteristics. By optimizing the shape of the transition cavity 21, the relative position of the transition cavity 21 with respect to the exhaust port 300 is basically kept unchanged when rotated to any circumferential position, thereby facilitating the adaptation to the exhaust port located at different positions.

[0052] Through this design, the valve assembly 100 of the present application can also be applied to other scroll compressors in which the exhaust port 300 is located at different positions with respect to the end plate 200 of the fixed scroll, so that the valve assembly 100 disclosed herein has a certain universality among different scroll compressors. In addition, different valve assemblies 100 of the same size can share one valve support seat 2.

[0053] In addition, those skilled in the art should understand that the parameters of the valve support seat 2 can be adjusted or different specifications of the valve support seat 2 can be selected according to the desired purposes, such as the valve closing pressure difference, the fluid flow speed, the flow rate, etc. For example, any of the height, diameter, volume of the valve support seat 2 and the volume of the transition cavity thereof can be adjusted to adjust the valve closing pressure difference. Since the valve support seat 2 is an independent component (such as a completely independent component in the embodiment shown in Figures 1 to 4 or a quasi-independent component integrated with the valve plate as shown in Figures 5 to 6 ), it can have good adjustability and does not pose any reliability risk to the operation of the compressor.

[0054] Furthermore, although it is specifically described above that the valve support is connected together with other components of the valve assembly by the attachment mechanism comprising the pin to form an assembly in which the components are unable to rotate relative to each other in the circumferential direction, it can also be understood that, according to the present application, the valve support can not be connected together with other components of the valve assembly, but the valve support can also be configured to be able to freely rotate in the circumferential direction relative to both the fixed scroll plate end plate and the sub-assembly composed of other components of the valve assembly. In this case, the upper shaft port and the lower shaft port of the transition cavity of the valve support are designed to be able to partially or completely cover the exhaust port and the valve hole when the valve support seat is rotated in the circumferential direction to any position. In this variant, similar effects of reducing the assembly complexity of the valve assembly and improving the installation reliability of the valve assembly are achieved in different configurations.

[0055] The preferred embodiments according to the present application are described above in combination with specific embodiments. It can be understood that the above description is only exemplary and not limiting, and those skilled in the art can think of various modifications and changes in reference to the above description without departing from the scope of the present application. These modifications and changes are also included in the protection scope of the present application.

Claims

1. A valve assembly for a scroll compressor, the scroll compressor comprising a fixed scroll plate, the fixed scroll plate comprising a fixed scroll plate end plate and a discharge port of volume V1 opened in the fixed scroll plate end plate, wherein, The valve assembly comprises: a valve plate having at least one valve hole formed therein; a valve disc arranged axially above the valve plate and configured to selectively open and close the valve hole; characterized in that the valve assembly further comprises a valve support seat arranged axially below the valve plate, a transition cavity extending axially through the valve support seat, and the valve support seat is configured to be freely rotatable circumferentially relative to the fixed scroll end plate after the valve assembly is assembled to the fixed scroll end plate, and the valve support seat allows the exhaust port to be in fluid communication with the valve hole through the transition cavity at any circumferential position of the valve support seat relative to the fixed scroll end plate.

2. The valve assembly of claim 1, wherein, The transition cavity has an upper axial port and a lower axial port, and the lower axial port is designed to be able to completely cover the exhaust port at any circumferential position of the valve support seat relative to the fixed scroll end plate.

3. The valve assembly of claim 2, wherein, The upper axial port is designed to completely cover each valve hole when the valve assembly is assembled, or to be able to completely cover each valve hole at any circumferential position of the valve support seat relative to the fixed scroll end plate.

4. The valve assembly of claim 1, wherein, The volume of the transition cavity is V2, where V2 is greater than V1.

5. The valve assembly of claim 1, wherein, The transition cavity is centrally formed with respect to the valve support seat.

6. The valve assembly of claim 5, wherein, The transition cavity is designed in the shape of a solid of revolution with the axis of the valve support seat as the axis of revolution.

7. The valve assembly of claim 6, wherein, The transition cavity is designed in the shape of a cylinder.

8. The valve assembly of any one of claims 1 to 7, wherein, The valve assembly is further configured to comprise a valve stop and an attachment mechanism, and the valve stop, the valve disc, the valve plate and the valve support seat can be sequentially connected together in the axial direction by means of the attachment mechanism so that the valve support seat cannot be rotated circumferentially relative to the valve plate.

9. The valve assembly of claim 8, wherein, The attachment mechanism comprises at least two pins, and at least two mounting holes are formed in the upper end surface of the valve support seat for one-to-one insertion of the at least two pins.

10. The valve assembly of any one of claims 1 to 7, wherein, The valve plate and the valve support seat are configured as an integral piece.

11. A scroll compressor characterized by, The scroll compressor comprises the valve assembly according to any one of claims 1 to 10.

12. The scroll compressor of claim 11, wherein, The fixed scroll further comprises a hub portion extending from the fixed scroll end plate, and the valve assembly further comprises an axial limiting mechanism configured to be installed in the hub portion in a manner that the valve assembly is fixed in position axially with respect to the fixed scroll end plate.

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