CN214699325U - Valve assembly and scroll compressor comprising same - Google Patents

Abstract

The utility model provides a valve module and contain its scroll compressor relates to compressor technical field, has solved the technical problem that scroll compressor capacity adjustment structure is complicated, the reliability is poor. The valve component comprises a valve body, wherein an exhaust flow path, an air suction flow path and a medium pressure flow path which are respectively communicated with an exhaust section, an air suction section and a compression section of the scroll compressor are arranged on the valve body, and a volume adjusting piece capable of realizing state switching through air suction and exhaust pressure is arranged in the valve body; when the volume adjusting piece is in different states, the air suction flow path and the medium pressure flow path are in a connected or disconnected state, so that the volume adjustment of the scroll compressor in partial load operation or full load operation is realized; the scroll compressor includes a valve assembly. The utility model discloses rely on the removal of suction and discharge control valve core position to realize the regional intercommunication of different pressures, capacity modulation when realizing scroll compressor's full load operation and partial load operation reduces the complexity of compressor structure, improves the operational reliability of compressor.

Description

Valve assembly and scroll compressor comprising same

Technical Field

The utility model belongs to the technical field of the compressor technique and specifically relates to a valve module and contain its scroll compressor is related to.

Background

For scroll compressors, at the beginning of their design, the capacity is tailored to the maximum load that exists during their operation. However, during the operation, the required exertion capacity of the compressor does not reach the maximum value in part of the time, but the compressor still operates at the maximum capacity, so the overall performance of the system is affected, and unnecessary energy waste is caused.

In order to solve the problem, conventionally, a mechanical structure is usually provided inside the compressor, such as the scroll compressor disclosed in chinese patents CN105026764B and CN106032799B, and the capacity adjustment is achieved by controlling the contact and separation of the stationary disk through the solenoid valve, and this mechanical power controls the control manner of the contact and separation between the stationary disk and the movable disk inside the scroll compressor, which not only has a problem of complicated structure, but also has a problem of increasing the reliability risk.

Therefore, the utility model provides a valve module and contain scroll compressor of this valve module with deloading function to this realizes the regulation of compressor capacity, reaches the purpose of varactor.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a valve module and contain the scroll compressor of this valve module to solve the technical problem that the scroll compressor capacity that exists among the prior art adjusts the structure complicacy, the reliability is poor.

In order to achieve the above purpose, the utility model provides a following technical scheme:

the utility model provides a valve component, which comprises a valve body arranged in a scroll compressor, wherein the valve body is provided with an exhaust flow path, an air suction flow path and a medium pressure flow path which are respectively communicated with an exhaust section, an air suction section and a compression section of the scroll compressor, and a volume adjusting piece which can realize state switching through the suction and exhaust pressure is arranged in the valve body; when the volume adjusting piece is in different states, the suction flow path and the medium pressure flow path are in a connected or disconnected state, so that the capacity adjustment of the scroll compressor in partial load operation or full load operation is realized.

As a further improvement of the utility model, the capacity adjusting piece comprises two operation states, namely a first state of full-load operation and a second state of partial-load operation of the scroll compressor; when the volume adjusting piece is in a first state, the air suction flow path and the medium pressure flow path are separated from each other and kept disconnected, and all sucked refrigerants participate in the compression process; when the volume adjusting piece is in a second state, the air suction flow path and the medium pressure flow path are connected and communicated with each other, part of sucked refrigerant flows back, and part of sucked refrigerant participates in a compression process.

As a further improvement of the present invention, the valve body comprises a valve seat with an opening at one end and a cover plate covering the opening of the valve seat; the volume adjusting piece is placed in the valve seat, is connected with the cover plate through an elastic piece and can axially reciprocate along the valve seat; the bottom of the valve seat is provided with an exhaust connecting hole connected with the exhaust flow path, and the side wall of the valve seat is provided with a medium-pressure connecting hole connected with the medium-pressure flow path; the cover plate is provided with an air suction connecting through hole communicated with the air suction cavity, the air suction flow path is arranged in the accommodating piece and communicated with the side part and the head part of the accommodating piece, and when the accommodating piece is in a second state, the middle compression joint through hole is communicated with the air suction flow path. Therefore, when the elastic element is in a natural extension state, the accommodating element is in contact connection with the bottom of the valve seat. When the discharge pressure of the scroll compressor is greater than the sum of the suction pressure and the elastic force of the elastic element, the volume adjusting element is in a first state; when the discharge pressure of the scroll compressor is less than the sum of the suction pressure and the elastic force of the elastic element, the volume adjusting element is in a second state.

As a further improvement of the present invention, when the exhaust pressure of the scroll compressor is greater than the suction pressure and the elastic member

As a further improvement of the present invention, the volume adjusting member includes a valve element having the same specification and shape as the inner cavity of the valve seat, an axial through hole provided at the head of the valve element, a radial through hole provided at the side of the valve element, an annular groove provided axially on the outer wall of the valve element, and a seal ring embedded in the annular groove to form a plurality of independent chambers between the valve seat and the outer wall of the valve element, wherein one end of the suction flow path is connected to the axial through hole, and the other end is connected to the radial through hole; when the volume adjusting piece is in the first state or the second state, the middle pressure connection through hole is communicated with different independent chambers, and the radial through hole is located in one independent chamber communicated with the middle pressure connection through hole.

As a further improvement of the present invention, the independent chambers include three chambers, which are respectively a pressure discharge chamber, a middle pressure chamber and a pressure suction chamber, and the exhaust connecting through hole is communicated with the pressure discharge chamber; the air suction connecting hole is communicated with the air suction chamber through the air suction flow path; the middle pressure chamber is positioned between the pressure suction chamber and the pressure discharge chamber, and when the valve core moves in a reciprocating mode, the middle pressure connecting through hole is communicated with the middle pressure chamber or the pressure suction chamber.

As a further improvement of the present invention, two adjacent annular grooves are spaced at equal intervals.

As a further improvement of the present invention, when the volume adjusting member is in the first state, a distance H1 between the valve core bottom and the valve seat bottom is greater than a maximum distance H2 between the middle crimping through hole and the pressure absorbing chamber.

As a further improvement, the exhaust flow path includes exhaust hose and exhaust passage, exhaust passage sets up on the division board, one end with exhaust section intercommunication, the other end with exhaust hose intercommunication.

As a further improvement of the utility model, the exhaust section is a static disc exhaust port or an exhaust cavity.

As a further improvement of the utility model, the medium pressure flow path includes medium pressure hose and medium pressure passageway, the medium pressure passageway is seted up on quiet dish, and one end communicates with the compression chamber of quiet dish, the other end with the medium pressure hose intercommunication.

The utility model provides a pair of scroll compressor, include the valve module.

As a further improvement of the present invention, the scroll compressor includes a housing, a partition plate, a stationary disk, a movable disk and a crankshaft, and the valve assembly is mounted on the partition plate.

Compared with the prior art, the utility model following beneficial effect has:

the utility model provides a scroll compressor with deloading function, through setting up the intercommunication that the removal that leans on suction and discharge control valve core position realized different pressure regions to capacity control when realizing scroll compressor's full load operation and partial load operation can avoid mechanical power unit's use, reduces the complexity of compressor structure, improves the operational reliability of compressor.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a cross-sectional view of a first embodiment of the valve assembly of the present invention installed in a scroll compressor;

FIG. 2 is an enlarged view of a portion A of FIG. 1;

FIG. 3 is an enlarged view of portion B of FIG. 1;

fig. 4 is a schematic structural view of a cover plate in the valve assembly of the present invention;

fig. 5 is a schematic structural view of a gasket in the valve assembly of the present invention;

fig. 6 is a schematic view of the structure of the valve seat in the valve assembly of the present invention;

fig. 7 is a schematic structural diagram of a sealing ring in the valve assembly of the present invention;

fig. 8 is a schematic view of the structure of the spring in the valve assembly of the present invention;

fig. 9 is a schematic structural view of a valve cartridge in the valve assembly of the present invention;

fig. 10 is an exploded view of the valve assembly of the present invention in a cut away view after it has been axially cut;

figure 11 is a cross-sectional view of the valve assembly of the present invention in a first state;

figure 12 is a cross-sectional view of the valve assembly of the present invention in a second state;

figure 13 is a partial cross-sectional view of the second embodiment of the valve assembly of the present invention after installation in a scroll compressor.

FIG. 1 shows a static disk exhaust port; 2. a partition plate; 3. a valve assembly; 4. a compression chamber; 5. a stationary disc; 6. a movable plate; 7. a housing; 8. an exhaust pipe; 9. an exhaust chamber; 10. an exhaust passage; 11. a medium pressure channel; 12. an exhaust hose; 13. a medium pressure hose; 14. a cover plate; 15. a gasket; 16. a valve seat; 1601. a valve end face; 1602. A threaded hole; 1603. an inner wall of the valve; 17. the air suction connecting through hole; 18. a middle pressure connection through hole; 19. the exhaust connecting through hole; 20. a seal ring; 21. a spring; 22. a valve core; 2201. an annular groove; 2202. a radial through hole; 2203. an axial through hole; 2204. an outer wall surface; 23. a screw; 24. a crankshaft; 25. an air suction cavity; 26. a pressure discharge chamber; 27. a middle pressure chamber; 28. a pressure suction chamber; 29. an intake air flow path.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The utility model provides a valve component which can adjust the capacity of a compressor by utilizing suction and discharge pressure, and the compressor has the load shedding function by arranging the valve component, so that the capacity of an internal refrigerant can be reduced when the compressor runs under partial load; specifically, the valve assembly 3 comprises a valve body arranged in the scroll compressor, an exhaust flow path, an air suction flow path 29 and a medium pressure flow path which are respectively communicated with an exhaust section, an air suction section and a compression section of the scroll compressor are arranged on the valve body, and a volume adjusting piece capable of realizing state switching through air suction and exhaust pressure is arranged in the valve body; when the capacity regulating member is in different states, the air suction flow path 29 is in a connected or disconnected state with the medium pressure flow path to realize capacity regulation of the scroll compressor in partial load operation or full load operation.

It should be further noted that the volume adjusting component includes two operation states, which are a first state of full load operation and a second state of partial load operation of the scroll compressor respectively; when the scroll compressor is in full load operation, the exhaust pressure of the scroll compressor is greater than the sum of the suction pressure and the elastic force of the elastic piece, the volume adjusting piece is in a first state, the suction flow path 29 and the medium pressure flow path are separated from each other and kept disconnected, and all the sucked refrigerants participate in the compression process; when the scroll compressor is in partial load operation, the exhaust pressure of the scroll compressor is less than the sum of the suction pressure and the elastic force of the elastic piece, the volume adjusting piece is in a second state, the suction flow path 29 and the medium pressure flow path are connected and communicated with each other, the sucked refrigerant partially flows back, and part of the sucked refrigerant participates in the compression process.

As an optional embodiment of the present invention, the valve body includes a valve seat 16 with an opening at one end and a cover plate 14 covering the opening of the valve seat 16; the volume adjusting part is placed in the valve seat 16, is connected with the cover plate 14 through an elastic part, and can axially reciprocate along the valve seat 16, and further, in an embodiment of the invention, the elastic part is a spring 21; when the spring 21 is in a natural extension state, i.e. in an uncompressed or tensioned state, the volume adjusting member is in contact connection with the bottom of the inner cavity of the valve seat 16, and is also in a second state; the bottom of the valve seat 16 is provided with an exhaust connecting hole 19 connected with the exhaust flow path, and the side wall is provided with a medium pressure connecting hole 18 connected with the medium pressure flow path; the cover plate 14 is provided with an air suction connecting hole 17 communicated with the air suction cavity 25, an air suction flow path 29 is arranged in the volume adjusting piece and communicated with the side part and the head part of the volume adjusting piece, and when the volume adjusting piece is in a second state, the medium pressure connecting hole 18 is communicated with the air suction flow path 29.

Furthermore, the volume adjusting part comprises a valve core 22 with the same specification and shape as the inner cavity of the valve seat 16, an axial through hole 2203 arranged at the head part of the valve core 22, a radial through hole 2202 arranged at the side part of the valve core 22, a plurality of annular grooves 2201 arranged on the outer wall surface 2204 of the valve core 22 along the axial direction, and a sealing ring 20 embedded in the annular grooves 2201 to form a plurality of independent chambers between the valve seat 16 and the outer wall of the valve core 22, wherein one end of the air suction flow path is connected with the axial through hole 2203, and the other end of the air suction flow path is connected with the radial through hole 2202; when the capacity adjuster is in the first or second state, the medium pressure communication hole 18 communicates with different independent chambers, and the radial through hole 2202 is located at one of the independent chambers communicating with the medium pressure communication hole 18.

The independent chambers comprise three chambers, namely a pressure discharge chamber 26, a middle pressure chamber 27 and a pressure suction chamber 28, and the exhaust connecting through hole 19 is communicated with the pressure discharge chamber 26; the suction connection hole 17 communicates with the suction chamber 28 through a suction flow path 29; the intermediate pressure chamber 27 is located between the pressure suction chamber 28 and the pressure discharge chamber 26, and the intermediate pressure through hole 18 communicates with the intermediate pressure chamber 27 or the pressure suction chamber 28 when the spool 22 reciprocates.

As an optional embodiment of the present invention, the interval between two adjacent annular grooves 2201 is equal.

When the capacity regulating part is in the first state, the distance H1 between the bottom of the valve core 22 and the bottom of the valve seat 16 is greater than the maximum distance H2 between the middle pressure connection through hole 18 and the pressure suction chamber 28, and through the structural arrangement, the middle pressure connection hole 18 and the pressure suction chamber 28 can be communicated when the capacity regulating part is in the second state, so that the middle pressure refrigerant in the scroll compressor can be ensured to flow back to the suction cavity 25 through the pressure suction chamber 28 and the suction flow path 29, and the capacity regulation is realized.

The exhaust flow path includes an exhaust hose 12 and an exhaust passage 10, the exhaust passage 10 is provided on the partition plate 2, one end thereof communicates with the exhaust section, and the other end thereof communicates with the exhaust hose 12.

Further, the exhaust section is a static disc exhaust port 1 or an exhaust cavity 9.

Further, the medium pressure flow path comprises a medium pressure hose 13 and a medium pressure channel 11, wherein the medium pressure channel 11 is arranged on the static disc 5, one end of the medium pressure channel is communicated with the compression cavity 4 of the static disc 5, and the other end of the medium pressure channel is communicated with the medium pressure hose 13.

The utility model also provides a scroll compressor, including foretell valve module 3, valve module 3 installs in scroll compressor.

Further, the scroll compressor includes a housing 7, a partition plate 2, a stationary plate 5, a movable plate 6, and a crankshaft 24, and the valve assembly 3 is mounted on the partition plate 2.

Example 1:

as shown in fig. 1, the utility model provides a scroll compressor, scroll compressor mainly comprise parts such as division board 2, quiet dish 5, driving disk 6, casing 7, blast pipe 8, bent axle 24, for exhaust chamber 9 between division board 2 and the casing 7, quiet dish gas vent 1 and exhaust chamber 9 intercommunication, blast pipe 8 is installed on casing 7 and is communicate with exhaust chamber 9. The crankshaft 24 is in transmission connection with the movable disc 6 and can drive the movable disc 6 to rotate; an air suction cavity 25 is arranged between the static disc 5 and the shell 7; in the operation process, under the driving of the crankshaft 24, the movable disc 6 makes a rotary translation around the fixed disc 5, so that a series of crescent-shaped compression cavities 4 are formed between the fixed disc and the fixed disc, and the compression process of gaseous refrigerants is realized.

The compressor also comprises a valve assembly 3 arranged in the scroll compressor, as shown in figures 1-3, the valve assembly 3 is assembled on the partition plate 2, and the two can be connected together in a welding mode, a bolt fixing mode and the like; as shown in fig. 4, the cover plate 14 is provided with a screw through hole and a suction through hole 17 for connecting with the valve seat 16; as shown in fig. 5, the gasket 15 is of a structure, the gasket 15 is arranged between the cover plate 14 and the valve seat 16, and the gasket 15 is provided with a screw through hole; as shown in fig. 6, which is a schematic structural diagram of the valve seat 16, the valve seat 16 is a cylindrical structure, one end of the valve seat is sealed, the other end of the valve seat is open, the open end of the valve seat 16 is provided with an annular valve end face 1601 which is formed by extending outward, the valve end face 1601 is provided with a threaded hole 1602 for connecting with a bolt, a middle crimping through hole 18 is formed in an inner valve wall 1603 of the valve seat 16, a valve core 22 is placed in an inner cavity of the valve seat 16, and an exhaust connecting through hole 19 is formed in the bottom of the valve seat 16; as shown in fig. 7, the structure of the sealing ring 20 is schematically illustrated; as shown in fig. 8, it is a schematic view of the structure of the spring 21; as shown in fig. 9, which is a schematic structural diagram of the valve core 22, a circumferential annular groove 2201 is formed in the valve core 22, a radial through hole 2202 is formed in the outer wall surface 2204, an axial through hole 2203 is formed in the head portion, that is, the side of the head portion close to the cover plate 14, and the radial through hole 2202 is communicated with the axial through hole 2203 through the air suction flow path 29; fig. 10 is an exploded view of a cut surface of the valve assembly 3 after being cut in the axial direction; fig. 11 is a cross-sectional view of the valve assembly 3 in a first state; fig. 12 is a cross-sectional view of the valve assembly 3 in the second state.

During assembly of the valve assembly 3: an exhaust connecting hole 19 for leading the exhaust pressure gaseous refrigerant led out from the partition plate 2 through the exhaust channel 10 into the valve seat 16; the middle pressure gaseous refrigerant led out from the static disc 5 through the middle pressure channel 11 is led into a middle pressure connection through hole 18 on the valve seat 16; suction pressure is introduced into the suction port hole 17 of the valve seat 16. The exhaust channel 10 on the partition plate 2 and the exhaust connecting hole 19 on the valve seat 16, and the middle pressure channel 11 on the static disc 5 and the middle pressure connecting hole 18 on the valve seat 16 are respectively connected together by an exhaust hose 12 and a middle pressure hose 13.

The valve component 3 comprises a cover plate 14, a gasket 15, a valve seat 16, a spring 21, a valve core 22 and other components, wherein one end of the spring 21 is connected with the cover plate 14, the other end of the spring is connected with the valve core 22, a sealing ring 20 can be assembled in a circumferential annular groove 2201 of the valve core 22, and the valve seat 16, the gasket 15 and the cover plate 14 are fixedly connected together through screws. The outer wall surface 2204 of the valve core 22, the valve inner wall 1603 of the valve seat 16 and the sealing ring 20 divide a gap space between the valve core 22 and the valve seat 16 into a suction pressure chamber 28, an intermediate pressure chamber 27 and a discharge pressure chamber 26, the valve core 22 is provided with a radial through hole 2202 and an axial through hole 2203, the radial through hole 2202 and the axial through hole are communicated through a suction flow path 29, and suction pressure can be introduced into the suction pressure chamber 28. Meanwhile, in the assembly process of the valve component 3, the following requirements are met: when the capacity regulating piece is in the first state, the distance H1 between the bottom of the valve core 22 and the bottom of the valve seat 16 is greater than the maximum distance H2 between the middle pressure joint through hole 18 and the pressure suction chamber 28, namely H2< H1, and the diameter phi d of the middle pressure joint through hole 18 is smaller than the length of the pressure suction chamber 28 or the middle pressure chamber 27, namely phi d < H3-H4.

When the compressor operates under a normal working condition, the exhaust pressure is larger than the suction pressure, the valve assembly 3 is in a first state, the compression cavity of the static disc 5 is not communicated with a suction refrigerant, and the compressor operates in a full-load state; when the compressor is in partial load working condition operation, the suction pressure and the force provided by the spring 21 to the valve core 22 are greater than the force provided by the exhaust pressure to the valve core 22, at the time, the valve assembly 3 is in the second state, at the time, the compression cavity of the static disc 5 is communicated with the suction refrigerant, and the middle pressure refrigerant in the compression cavity of the compressor leaks to the suction side of the compressor, so that the capacity adjusting function is realized.

Example 2:

as shown in fig. 13, only the difference from embodiment 1 will be described in this embodiment, and embodiment 2 differs from embodiment 1 only in that the introduction end of the exhaust passage 10 is not the stationary disk exhaust port 1 but the exhaust chamber 9. In this embodiment, the exhaust passage 10 is vertically disposed through the partition plate 2, and has a top end communicating with the exhaust chamber 9 and a lower end connected to the exhaust hose 12. In the embodiment 2, the exhaust refrigerant in the exhaust chamber 9 is led to the exhaust pressure chamber of the valve assembly 3, and the valve core is driven to change its position under partial load.

It should be noted that "inward" is a direction toward the center of the accommodating space, and "outward" is a direction away from the center of the accommodating space.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship indicated based on the orientation or positional relationship shown in fig. 1, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (12)

1. A valve component is characterized by comprising a valve body arranged in a scroll compressor, wherein the valve body is provided with an exhaust flow path, an air suction flow path and a medium pressure flow path which are respectively communicated with an exhaust section, an air suction section and a compression section of the scroll compressor, and a volume adjusting piece capable of realizing state switching through air suction and exhaust pressure is arranged in the valve body; when the volume adjusting piece is in different states, the suction flow path and the medium pressure flow path are in a connected or disconnected state, so that the capacity adjustment of the scroll compressor in partial load operation or full load operation is realized.

2. The valve assembly of claim 1, wherein said volume modulation member includes two operating states, a first state of full load operation and a second state of partial load operation of the scroll compressor; when the volume adjusting piece is in a first state, the air suction flow path and the medium pressure flow path are separated from each other and kept disconnected, and all sucked refrigerants participate in the compression process; when the volume adjusting piece is in a second state, the air suction flow path and the medium pressure flow path are connected and communicated with each other, part of sucked refrigerant flows back, and part of sucked refrigerant participates in a compression process.

3. The valve assembly of claim 2, wherein the valve body includes a valve seat open at one end and a cover plate closing the valve seat opening; the volume adjusting piece is placed in the valve seat, is connected with the cover plate through an elastic piece and can axially reciprocate along the valve seat; the bottom of the valve seat is provided with an exhaust connecting hole connected with the exhaust flow path, and the side wall of the valve seat is provided with a medium-pressure connecting hole connected with the medium-pressure flow path; the cover plate is provided with an air suction connecting through hole communicated with the air suction cavity, the air suction flow path is arranged in the accommodating piece and communicated with the side part and the head part of the accommodating piece, and when the accommodating piece is in a second state, the middle compression joint through hole is communicated with the air suction flow path.

4. The valve assembly according to claim 3, wherein the volume adjusting member comprises a valve core having the same specification and shape as the inner cavity of the valve seat, an axial through hole arranged at the head of the valve core, a radial through hole arranged at the side of the valve core, an annular groove arranged on the outer wall of the valve core along the axial direction, and a sealing ring embedded in the annular groove to form a plurality of independent chambers between the valve seat and the outer wall of the valve core, one end of the suction flow path is connected with the axial through hole, and the other end of the suction flow path is connected with the radial through hole; when the volume adjusting piece is in the first state or the second state, the middle pressure connection through hole is communicated with different independent chambers, and the radial through hole is located in one independent chamber communicated with the middle pressure connection through hole.

5. The valve assembly of claim 4, wherein the independent chambers include three, respectively a discharge pressure chamber, an intermediate pressure chamber, and a suction pressure chamber, the discharge communication hole communicating with the discharge pressure chamber; the air suction connecting hole is communicated with the air suction chamber through the air suction flow path; the middle pressure chamber is positioned between the pressure suction chamber and the pressure discharge chamber, and when the valve core moves in a reciprocating mode, the middle pressure connecting through hole is communicated with the middle pressure chamber or the pressure suction chamber.

6. The valve assembly of claim 4, wherein the spacing between adjacent ones of the annular grooves is equal.

7. The valve assembly of claim 5, wherein a distance H1 between the poppet bottom and the valve seat bottom is greater than a maximum distance H2 between the center crimping through hole and the suction plenum when the volume adjuster is in the first state.

8. The valve assembly of claim 1, wherein the vent flow path includes a vent hose and a vent passage opening in the divider plate with one end in communication with the vent section and the other end in communication with the vent hose.

9. The valve assembly of claim 8, wherein the vent section is a stationary disc vent or vent cavity.

10. The valve assembly of claim 1, wherein the intermediate pressure flow path comprises an intermediate pressure hose and an intermediate pressure passage, the intermediate pressure passage opening in the stationary disc with one end in communication with the compression chamber of the stationary disc and the other end in communication with the intermediate pressure hose.

11. A scroll compressor including a valve assembly according to any one of claims 1 to 10.

12. The scroll compressor of claim 11, wherein the scroll compressor includes a housing, a separation plate, a stationary plate, a movable plate, and a crankshaft, the valve assembly being mounted on the separation plate.

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