Scroll compressor

Abstract

The present invention relates to a scroll compressor. The scroll compressor includes: a housing in which a first fluid passage for introducing and receiving fluid from an external pipeline is provided; and a stationary scroll disposed in the housing and configured to cooperate with a moving scroll to form a compression chamber for compressing a working fluid. A second fluid passage communicating with the compression chamber of the scroll compressor is provided in the stationary scroll. Wherein, a connecting conduit is provided between the housing and the stationary scroll. The connecting conduit is provided with a third fluid passage. The third fluid passage fluid-sealingly connects the first fluid passage to the second fluid passage. The first fluid passage, the second fluid passage and the third fluid passage constitute a fluid passage for introducing fluid into the compression chamber. Wherein, a check valve is provided in the fluid passage, and the check valve is used to prevent the working fluid in the compression chamber from flowing out of the compressor to the outside through the fluid passage.

Description

Technical Field

[0001] The present invention relates to the field of scroll compressors, and more particularly, to a scroll compressor having an improved jet / liquid injection enthalpy-increasing device. Background Art

[0002] The content of this section only provides background information related to the present disclosure, which may not constitute prior art.

[0003] Generally, a scroll compressor is a device used to compress a refrigerant for refrigeration or heating. A scroll compressor typically includes a scroll compression assembly or a scroll compression mechanism having a moving scroll and a stationary scroll. The scroll of the moving scroll cooperates with the scroll of the stationary scroll to form a compression chamber, and the compression of the gas is achieved in the compression chamber through the translational movement of the moving scroll relative to the stationary scroll. In some cases, especially when the outdoor temperature is relatively low, the evaporation pressure drops, the suction specific volume of the compressor increases, and the compression ratio becomes relatively large, which easily causes the temperature inside the compressor to be too high. To further improve the performance of the compressor, the enthalpy can be increased by injecting liquid or gas into the intermediate pressure chamber of the compressor. That is, by injecting a liquid or gaseous refrigerant into the intermediate pressure chamber of the compressor, the gas amount inside the compressor is increased, and at the same time, the temperature inside the compression chamber is reduced.

[0004] However, in a scroll compressor provided with a liquid injection or gas injection enthalpy-increasing fluid passage in the prior art, a check valve is usually not provided on the enthalpy-increasing fluid passage. When liquid injection or gas injection enthalpy increase is not performed on the compressor, the gas in the compression chamber of the compressor will flow into the outside of the intermediate pressure chamber of the compressor through the enthalpy-increasing fluid passage. This will cause fluctuations in the gas pressure in the intermediate pressure chamber of the compressor, resulting in a decrease in the compression performance of the compressor.

[0005] Therefore, there is still a need to further improve the jet or liquid injection enthalpy-increasing device in the compressors of the prior art to further improve the performance of the compressor. Summary of the Invention

[0006] To solve or mitigate at least a part of the above problems in the prior art, the present invention provides a check valve disposed in an enthalpy-increasing fluid passage of a compressor. Disposing such a check valve will prevent the gas in the intermediate pressure chamber of the compressor from flowing out of the enthalpy-increasing fluid passage to the outside of the compressor when enthalpy-increasing gas / liquid is not supplied to the intermediate pressure chamber, thereby preventing pressure fluctuations in the intermediate pressure chamber and further improving the compression performance of the compressor. In addition, a flexible connecting conduit is provided in the scroll compressor according to the present invention. The two ends of the flexible connecting conduit are respectively disposed in the enthalpy-increasing fluid passages of the stationary scroll and the housing and are connected to the stationary scroll and the housing in a fluid-tight manner. The flexible connecting conduit has a certain flexibility. Due to the provision of the flexible connecting conduit, it is possible to ensure a sealed connection between the enthalpy-increasing fluid passages of the stationary scroll and the housing while not affecting the relative movement of the stationary scroll with respect to the housing.

[0007] Specifically, the scroll compressor according to the present invention includes: a housing in which a first fluid passage for introducing and receiving fluid from an external pipeline is provided; and a stationary scroll disposed in the housing and configured to cooperate with an orbiting scroll to form a compression chamber for compressing a working fluid. A second fluid passage communicating with the compression chamber of the scroll compressor is provided in the stationary scroll. Among them, a connecting conduit is provided between the housing and the stationary scroll. The connecting conduit is provided with a third fluid passage. The third fluid passage fluid-tightly connects the first fluid passage to the second fluid passage. The first fluid passage, the second fluid passage, and the third fluid passage constitute a fluid passage for introducing fluid into the compression chamber. Among them, a check valve is provided in the fluid passage. The check valve is used to prevent the working fluid in the compression chamber from flowing out of the compressor through the fluid passage.

[0008] Among them, the connecting conduit enables the stationary scroll to axially float relative to the housing.

[0009] Among them, the connecting conduit has a first end, a second end, and a middle section connecting the first end and the second end. Among them, the first end and the second end have a drum shape. The maximum outer diameter of the middle section is smaller than the maximum outer diameter of the first end and the second end.

[0010] Among them, grooves are provided at the maximum outer diameters of the first end and the second end. Sealing rings are provided in the grooves to achieve sealed connections between the connecting conduit and the housing and between the connecting conduit and the stationary scroll.

[0011] Among them, stop members are provided in the first fluid passage and the second fluid passage. The stop members limit the position of the connecting conduit in the first fluid passage and the second fluid passage.

[0012] Among them, the check valve is provided in the first fluid passage. The connecting conduit is disposed adjacent to the check valve.

[0013] Among them, the check valve includes a valve seat having a valve seat through hole, a valve disc for opening or closing the valve seat through hole, and a thrust member. The valve disc is located between the valve seat and the thrust member.

[0014] Among them, the thrust member is disposed adjacent to the connecting conduit and serves as a stopper for restricting the position of the connecting conduit in the first fluid passage.

[0015] Among them, the check valve further includes a biasing member. The biasing member is configured to press the valve disc toward the valve seat. The thrust member is configured to accommodate the biasing member and provide a guiding function for the biasing member.

[0016] Among them, the valve seat and the thrust member are disposed in the fluid passage in a threaded connection or an interference fit manner.

[0017] Among them, the check valve is disposed in the third fluid passage in the connecting conduit. Among them, the check valve includes a valve seat having a valve seat through hole, a valve disc for opening or closing the valve seat through hole, and a thrust member. The valve seat is a separate component disposed in the third fluid passage in a threaded connection or an interference fit manner or is a part of the connecting conduit.

[0018] Among them, the check valve is disposed in the second fluid passage of the stationary scroll. Among them, the check valve includes a valve seat having a valve seat through hole, a valve disc for opening or closing the valve seat through hole, and a thrust member, and the valve disc is disposed between the valve seat and the thrust member. The valve seat is a separate component disposed in the second fluid passage in a threaded connection or an interference fit manner or is a part of the second fluid passage.

[0019] Among them, the stationary scroll includes a split cover portion and a body portion. The second fluid passage includes a section disposed between the cover portion and the body portion. Description of the Drawings

[0020] The drawings described herein are only for illustrative purposes of exemplary structures and are not intended to limit the scope of the present disclosure, wherein:

[0021] Figure 1a-1c They are respectively a top view, a partial cross-sectional view, and a partial enlarged view showing a scroll compression assembly portion of a scroll compressor according to a first embodiment;

[0022] Figure 2a-2c They are respectively a perspective view, a top view, and a cross-sectional view of an assembly having a cover portion of a stationary scroll, a flexible connecting conduit, and a check valve;

[0023] Figure 3a-3b A perspective view and a cross-sectional view showing a compressor housing and a cover portion structure, and a flexible connecting conduit and a check valve in a disassembled state;

[0024] Figure 4a-4b They are respectively a perspective view and a cross-sectional view of a flexible connecting conduit without a sealing ring;Figure 4c-4d They are respectively the front view and sectional view of a flexible connecting duct with a sealing ring.

[0025] Figure 5a-5c They are respectively the top view, partial sectional view and partial enlarged view showing the scroll compression assembly part of a scroll compressor according to the second embodiment;

[0026] Figure 6a-6e They are respectively two three-dimensional views, sectional views, three-dimensional views in disassembled state and sectional views in disassembled state of a flexible connecting duct provided with a check valve;

[0027] Figure 7a-7c They are respectively the partial sectional view, partial enlarged view of the scroll compression assembly part of a scroll compressor according to the third embodiment and the top view of the body part of the stationary scroll. Detailed implementation manners

[0028] As introduced in the background art, in the compressors of the prior art, a check valve is usually not provided in the enthalpy-increasing fluid passage, which easily causes gas pressure fluctuations in the middle pressure chamber of the compressor and reduces the performance of the compressor. To solve this problem, a check valve is provided in the enthalpy-increasing device according to the present application. After the check valve is provided, when it is necessary to inject gas or liquid into the middle pressure chamber of the compressor, the check valve opens. When it is not necessary to inject gas or liquid into the middle pressure chamber of the compressor, the check valve closes, and the gas in the middle pressure chamber will not flow out of the compressor through the enthalpy-increasing fluid passage. Further, in order to still achieve axial flexibility of the stationary scroll in a compressor provided with an enthalpy-increasing fluid passage, a flexible connecting duct is provided in the compressor.

[0029] Next, with reference to the drawings, a compressor with a novel check valve and flexible connecting duct according to the present invention will be introduced in detail.

[0030] Figure 1a-1c The top view, partial sectional view and partial enlarged view of the scroll compression assembly part 100 of a scroll compressor according to the first embodiment of the present invention are shown. As shown in the figure, the scroll compressor has a housing 2, a stationary scroll 3, an orbiting scroll 4, a top cover 5 and an enthalpy-increasing fluid passage 12. The scroll compressor also has power parts such as the main bearing, main bearing seat, and motor of the scroll compressor that are not shown in the view. Among them, the stationary scroll 3 can include a cover part 31 and a body part 32. Among them, the cover part 31 and the body part 32 can be separate components, that is, the stationary scroll is a split type. The cover part 31 and the body part 32 can also be integral. The cover part 31 is located above the body part 32 in the axial direction and is provided between the body part 32 and the top cover 5.

[0031] According to the scroll compressor of the present invention, a check valve 11 and a flexible connecting conduit 13 are provided in the enthalpy-increasing fluid passage 12. A part of the enthalpy-increasing fluid passage is provided in the compressor housing and is referred to as the first fluid passage 001. A part of the enthalpy-increasing fluid passage is provided in the stationary scroll and is referred to as the second fluid passage 002. In the case where the stationary scroll is split, the second fluid passage may include a section formed between the cover portion 31 and the body portion 32. One end of the enthalpy-increasing fluid passage communicates with the medium-pressure chamber of the compressor, and the other end of the enthalpy-increasing fluid passage is connected to the source of gas or liquid to be delivered to the medium-pressure chamber. Among them, the first end 131 of the flexible connecting conduit 13 is provided in the stationary scroll 3, which is located in the second fluid passage 002 in the stationary scroll and is connected to the second fluid passage in a fluid-tight manner. Exemplarily, as Figure 1c shown, the first end of the flexible connecting conduit 13 is provided in the cover portion 31, and it can also be directly provided in the body portion of the stationary scroll. The second end 132 of the flexible connecting conduit 13 is provided in the compressor housing 2, which is located in the first fluid passage 001 in the compressor housing 2 and is connected to the first fluid passage in a fluid-tight manner. The flexible connecting conduit 13 realizes the flexible and sealed communication of the enthalpy-increasing fluid passage from the compressor housing to the stationary scroll. Since the flexible connecting conduit 13 has a certain flexibility, the stationary scroll can float up and down relative to the compressor housing without affecting the sealing performance of the enthalpy-increasing fluid passage.

[0032] Figure 2a , 2b Figures 2a, 2b, and 2c respectively show a perspective view, a top view, and a cross-sectional view of the components of the check valve 11, the flexible connecting conduit 13, and the cover portion 31. As shown, the cover portion 31 has a cylindrical shape with a bottom 311 and a concave portion 312. A discharge hole 315 is provided in the bottom 311 of the cover portion. A part 124, 125 of the enthalpy-increasing fluid passage is provided in the side portion 313 of the cover portion 311. The lateral enthalpy-increasing fluid passage 124 extends radially and has a large-diameter portion 1241 and a small-diameter portion 1242 to form a stepped portion 1243. The longitudinal enthalpy-increasing fluid passage 125 extends axially. The first end 131 of the flexible connecting conduit 13 is provided in the large-diameter portion 1241 and is restricted from moving radially toward the center of the cover portion by the stepped portion 1243. Here, the stepped portion 1243 serves as a stopper for restricting the position of the flexible connecting conduit in the second fluid passage. The second end 132 of the flexible connecting conduit 13 is adjacent to the check valve 11. The check valve 11 provides a thrust function for the flexible connecting conduit 13 and restricts the movement of the flexible connecting conduit 13 along the enthalpy-increasing fluid passage. Figure 3a and 3bSketches 1 and 2 respectively show a perspective view and a sectional view of the cover part 31, the check valve 11, and the compressor housing 2. In these figures, each component of the check valve 11, such as the valve disc 111 (also known as the valve core), the spring 112, the thrust piece 113, and the valve seat 114, is shown in a disassembled state, and the state when the cover part 31 is disposed in the compressor housing 2 is shown. For clarity, other components are omitted from the view.

[0033] Figure 4a-4b Sketches 3 and 4 show a perspective view and a sectional view of the flexible connection conduit 13 without the sealing ring. Because of its shape similar to that of a leg bone, the flexible connection conduit 13 is also called the "dog bone". As shown in the figure, the flexible connection conduit 13 has an axisymmetric shape, which includes a first end 131 and a second end 132 with a larger outer diameter and a middle section 136 with a smaller outer diameter. The flexible connection conduit 13 is provided with a central through hole 138 extending along its axial direction at its radial center. When the flexible connection conduit 13 is disposed in the enthalpy-increasing fluid passage, the liquid or gas to be delivered to the medium-pressure chamber of the compressor passes through the central through hole 138 and is delivered. Its first end 131 and second end 132 have a drum-shaped outer contour. Grooves 133 and 135 are respectively provided at the top ends of the outer peripheral surfaces of the first end 131 and the second end 132. These grooves 133 and 135 are used to dispose the sealing rings 1331 and 1351 therein. Figure 4c and 4d Sketches 5 and 6 respectively show a front view and a sectional view of the flexible connection conduit 13 provided with the sealing rings. When the flexible connection conduit 13 is disposed in the enthalpy-increasing fluid passage, these sealing rings 1331 and 1351 are in sealing contact with the inner surface of the enthalpy-increasing fluid passage, thereby realizing the sealed connection between the flexible connection conduit 13 and the enthalpy-increasing fluid passage. When the flexible connection conduit 13 is disposed in the enthalpy-increasing fluid passage, this drum-shaped shape at both ends of the flexible connection conduit 13 helps the sealing ring to contact the inner surface of the enthalpy-increasing fluid passage. Especially when the stationary scroll moves relative to the housing, this structure can still ensure the sealed contact between the sealing ring and the inner surface of the enthalpy-increasing fluid passage.

[0034] Next, in conjunction with Figure 1c and Figure 2c the structure and working principle of the check valve 11 when it is disposed in the enthalpy-increasing fluid passage will be introduced in detail. As Figure 1c and Figure 2cAs shown, the check valve according to the present invention has a valve disc 111, a spring 112, a thrust member 113, and a valve seat 114. Among them, the valve disc 111 is a disc-shaped structure with a central through hole 1112. A central hole 1131 is provided in the middle of the thrust member 113, and a bottom hole 1135 is provided at its bottom. The central hole 1131 communicates with the bottom hole 1135 to form a through hole, and the diameter of the central hole 1131 is larger than the diameter of the bottom hole 1135. The spring 112 is arranged in the central hole 1131, and the central hole provides a guiding function for the expansion and contraction of the spring 112. One end of the spring 112 is connected to the bottom of the thrust member 113, and the other end is connected to the valve disc 111. The spring 112 presses the valve disc 111 towards the valve seat 114. Those skilled in the art can understand that in other embodiments, the spring may not be provided. A flange 1134 with a larger outer diameter is provided on the outer peripheral edge of the thrust member 113. The flange 1134 cooperates with the stepped portion 211 in the enthalpy-increasing fluid passage to determine the position of the thrust member in the enthalpy-increasing fluid passage. The thrust member 113 is arranged in the enthalpy-increasing fluid passage by means of, for example, threaded connection or interference fit. The outer end of the bottom of the thrust member 113 provided with the bottom hole 1135 abuts against the second end 132 of the flexible connection conduit 13 to limit the position of the flexible connection conduit 13 in the enthalpy-increasing fluid passage. Here, the thrust member 113 serves as a stopper for limiting the position of the flexible connection conduit in the first fluid passage.

[0035] The valve seat 114 can be arranged in the enthalpy-increasing fluid passage by means of, for example, threaded connection or interference fit. The valve seat 114 is provided with a plurality of through holes uniformly arranged along its circumference, such as the through hole 1142. When the check valve is assembled in the enthalpy-increasing fluid passage, the through hole 1142 of the valve seat 114 is not aligned with the central through hole 1112 of the valve disc 111. The valve disc has a valve disc closed position and a valve disc open position. When the valve disc is in the valve disc closed position, that is, when the valve disc 111 presses against the valve seat 114, the valve disc 111 prevents fluid from flowing through the enthalpy-increasing fluid passage. When it is necessary to input enthalpy-increasing gas or liquid into the medium-pressure chamber of the compressor, the pressure of the gas or liquid overcomes the elastic force of the spring 112 to make the valve disc 111 of the check valve leave the valve seat 114, so that the through hole 1142 of the valve seat 114 communicates with the central through hole 1112 of the valve disc 111, that is, the valve disc is in the valve disc open position, to realize the communication of the enthalpy-increasing fluid passage.

[0036] According to the above compressor of the present invention, since a check valve is provided in the enthalpy-increasing passage, the pressure fluctuation in the medium-pressure chamber of the compressor can be avoided, and the performance of the compressor is further improved. In addition, by providing a flexible connection conduit between the housing of the compressor and the stationary scroll, the airtight connection of the enthalpy-increasing fluid passage from the compressor housing to the stationary scroll is realized and the axial floating of the stationary scroll can be ensured.

[0037] Figure 5a-5cA top view, a partial cross-sectional view, and a partial enlarged view of a scroll compression assembly 100' of a scroll compressor according to a second embodiment of the present invention are shown. As shown, the scroll compressor has a housing 2', a stationary scroll 3', a moving scroll 4', a top cover 5', and an enthalpy-increasing fluid passage 12'. The scroll compressor also has power parts such as a main bearing, a main bearing seat, and an electric motor of the scroll compressor that are not shown in the view. The scroll compressor according to this embodiment is different from Figure 1a-1c the scroll compressor in that the check valve is not directly provided in the enthalpy-increasing fluid passage in the housing or the stationary scroll, but is provided in a flexible connecting conduit, thereby forming a combined check valve.

[0038] According to this embodiment, a first fluid passage 001' is provided in the housing 2'. A second fluid passage 002' is provided in the stationary scroll. In the case where the stationary scroll is split, the second fluid passage may include a section formed between a cover portion 31' and a body portion 32'. A flexible connecting conduit 13' connects the stationary scroll and the housing and a check valve 11' is provided therein. A stop member 16' is provided in the first fluid passage 001'. A first end 131' of the flexible connecting conduit 13' is disposed in an enthalpy-increasing fluid passage portion 1242' of the cover portion 31' and is connected to the enthalpy-increasing fluid passage in a sealed manner. A second end 132' of the flexible connecting conduit 13' is disposed in an enthalpy-increasing fluid passage portion 122' in the compressor housing 2' and is connected to the enthalpy-increasing fluid passage in a sealed manner. The flexible connecting conduit 13' realizes flexible and sealed communication of the enthalpy-increasing fluid passage from the compressor housing 2' to the stationary scroll 3'. The stop member 16' is disposed in the enthalpy-increasing fluid passage portion 123'. The diameter of the enthalpy-increasing fluid passage portion 123' may be larger than the diameter of the enthalpy-increasing fluid passage portion 122' to form a stepped portion. The stop member 16' may be fixed in the enthalpy-increasing fluid passage portion 123' in a threaded connection manner. A small-diameter portion 1241' and a large-diameter portion 1242' in the enthalpy-increasing fluid passage 124' form a stepped portion 1246', and the stepped portion 1246' and the stop member 16' together limit the position of the flexible connecting conduit 13' in which the check valve 11' is provided in the enthalpy-increasing fluid passage. A connector 19' is provided at a port on the outer side of the housing of the enthalpy-increasing fluid passage, and the connector 19' can be used to connect to an external conveying pipeline.

[0039] As Figure 5c and Figure 6a-6eAs shown, the check valve 11' has a valve disc 111', a thrust member 113' and a valve seat 114'. The check valve may also have a spring 112'. Among them, the valve disc 111', the spring 112', the thrust member 113' and the valve seat 114' are all arranged in the through hole 138' of the flexible connection conduit 13'. The through hole 138' provides a guiding function for the spring. Among them, the valve disc 111' is a disc-shaped structure with a central through hole 1112'. A central hole 1131' is provided in the middle of the thrust member 113'. The thrust member 113' is arranged in the through hole 138' by means of, for example, threaded connection. The valve seat 114' can be arranged in the through hole 138' by means of, for example, threaded connection or interference fit. The valve seat 114' is provided with a plurality of through holes 1142' arranged circumferentially and evenly. Six through holes are shown in the drawings. Those skilled in the art should understand that other numbers of through holes can be provided. The spring 112' is arranged between the valve disc 111' and the thrust member 113'. The working principle of this check valve 11' is similar to that of the above-mentioned check valve 11 and will not be elaborated here. In addition, the valve seat of this check valve can be a small-diameter part in the through hole 138' integrated with the flexible connection conduit.

[0040] Similar to Figure 1c the flexible connection conduit 13 of the embodiment shown, the flexible connection conduit 13' has an axisymmetric shape, which includes a first end 131' and a second end 132' with a larger outer diameter and a middle section 136' with a smaller outer diameter. The flexible connection conduit 13' is provided with a central through hole 138' extending along its own axis at its radial center. The first end 131' and the second end 132' have a drum-shaped outer contour. Grooves 133' and 135' are respectively provided at the top of the outer peripheral surfaces of the first end 131' and the second end 132'. These grooves 133', 135' are used to arrange sealing rings 1331', 1351' therein. When the flexible connection conduit 13' is arranged in the enthalpy-increasing fluid channel, these sealing rings 1331', 1351' are in sealing contact with the inner surface of the enthalpy-increasing fluid channel, thereby realizing the sealed connection between the flexible connection conduit 13' and the enthalpy-increasing fluid channel 12'.

[0041] According to the enthalpy-increasing device of this embodiment, it can not only prevent the gas in the middle pressure chamber of the compressor from flowing through the supercharging channel to the outside of the compressor, but also make the enthalpy-increasing channel more compact.

[0042] Figure 7a and Figure 7bShows a partial cross-sectional view and a partial enlarged view of the scroll compression assembly 100 of the third embodiment of the scroll compressor. The scroll compression assembly according to this embodiment has a housing 2, a stationary scroll 3, an orbiting scroll 4, a top cover 5, and an enthalpy-increasing fluid passage 12. The feature of this embodiment is that the check valve 11 is disposed in the enthalpy-increasing fluid passage portion 323 of the body portion 32 of the stationary scroll.

[0043] According to this embodiment, the first end of the flexible connection conduit 13 is disposed in the enthalpy-increasing fluid passage 002 of the cover portion 31 and is connected to the enthalpy-increasing fluid passage in a sealed manner. The second end of the flexible connection conduit 13 is disposed in the enthalpy-increasing fluid passage 001 in the compressor housing 2 and is connected to the enthalpy-increasing fluid passage in a sealed manner. The flexible connection conduit 13 realizes the flexible and sealed communication of the enthalpy-increasing fluid passage from the compressor housing to the cover portion. A stopper 16 is disposed in the enthalpy-increasing fluid passage 001, and the stopper 16 is disposed in the enthalpy-increasing fluid passage portion 123. The diameter of the enthalpy-increasing fluid passage portion 123 may be larger than the diameter of the enthalpy-increasing fluid passage portion 122 to form a stepped portion. The stopper 16 may be fixed in the enthalpy-increasing fluid passage portion 123 by a threaded connection. The stepped portion formed by the large-diameter portion 1241 and the small-diameter portion 1242 in the enthalpy-increasing fluid passage on the cover portion 31 side and the stopper 16 together limit the position of the flexible connection conduit 13 in the enthalpy-increasing fluid passage. A adapter 19 is disposed at the port on the outer side of the housing of the enthalpy-increasing fluid passage, and the adapter 19 may be used to connect to an external delivery pipe.

[0044] As Figure 7bAs shown, the check valve 11" has a valve disc 111", a spring 112", a thrust member 113", and a valve seat 114". Among them, the valve disc 111", the spring 112", the thrust member 113", and the valve seat 114" are all arranged in the enthalpy-increasing fluid passage portion 323" of the stationary scroll. Among them, the valve disc 111" has a circular plate-like structure with a central through-hole 1112". A central hole 1131" is provided in the middle of the thrust member 113". The thrust member 113" is arranged in the enthalpy-increasing fluid passage portion 323" by means of, for example, threaded connection or interference fit. The valve seat 114" can be arranged in the enthalpy-increasing fluid passage portion 323" by means of, for example, threaded connection or interference fit. The valve seat 114" is provided with a plurality of through-holes 1142" arranged circumferentially and uniformly. The spring 112" is arranged between the valve disc 111" and the thrust member 113". In the assembled state, the valve disc has a closed position and an open position. At the closed position, the through-holes 1142" of the valve seat 114" are not aligned with the central through-hole 1112" of the valve disc 111". That is, when the valve disc 111" presses against the valve seat 114", the valve disc 111" prevents fluid from flowing through the enthalpy-increasing fluid passage. When it is necessary to input enthalpy-increasing gas or liquid into the medium-pressure chamber of the compressor, the pressure of the gas or liquid overcomes the elastic force of the spring 112" to make the valve disc 111" of the check valve leave the valve seat 114" and be in the open position, so that the through-holes of the valve seat 114" are communicated with the central through-hole 1112" of the valve disc 111" to realize the communication of the enthalpy-increasing fluid passage. Figure 7c The top view of the stationary scroll of the third embodiment is shown. In addition, according to another embodiment, the valve seat of this check valve can be a small-diameter portion in the enthalpy-increasing fluid passage portion 323" that is integral with the stationary scroll.

[0045] According to the scroll compressor of this embodiment, its check valve is vertically arranged in the fluid passage on the stationary scroll, making the entire enthalpy-increasing fluid passage more compact.

[0046] In this article, "axial direction" refers to the direction in which the main shaft of the compressor extends, and "lateral direction" is the direction perpendicular to the axial direction of the compressor.

[0047] Although some embodiments and variations of the present invention have been specifically described, those skilled in the art should understand that the present invention is not limited to the embodiments and variations described above and shown in the drawings, but may include various other possible variations and combinations. Other variations and variants can be realized by those skilled in the art without departing from the essence and scope of the present invention. All such variations and variants fall within the scope of the present invention. Moreover, all the components described herein can be replaced by other technically equivalent components.

Claims

1. A scroll compressor, comprising: A housing (2, 2′, 2"), in which a first fluid passage (001, 001′, 001") is provided for introducing and receiving fluid from an external pipeline; And A stationary scroll (3, 3′, 3"), which is arranged in the housing and is configured to cooperate with a moving scroll to form a compression chamber for compressing working fluid. A second fluid passage (002, 002′, 002") communicating with the compression chamber of the scroll compressor is provided in the stationary scroll, Wherein a connecting conduit (13, 13′, 13") is provided between the housing and the stationary scroll, The connecting conduit is provided with a third fluid passage (003, 003′, 003"), and the third fluid passage fluid-sealingly connects the first fluid passage to the second fluid passage, The first fluid passage, the second fluid passage and the third fluid passage constitute a fluid passage for introducing fluid into the compression chamber. Wherein, a check valve (11, 11′, 11") is provided in the fluid passage, and the check valve is used to prevent the working fluid in the compression chamber from flowing out to the outside of the compressor through the fluid passage, Wherein, the connecting conduit enables the stationary scroll to axially float relative to the housing, Wherein, the connecting conduit (13, 13′, 13") has a first end (131, 131′, 131") and a second end (132, 132′, 132") and a middle section (136, 136′, 136") connecting the first end and the second end. Wherein, the first end and the second end have a drum shape, and the maximum outer diameter of the middle section is smaller than the maximum outer diameter of the first end and the second end.

2. The scroll compressor according to claim 1, wherein, Grooves are provided at the maximum outer diameters of the first end and the second end, and sealing rings are provided in the grooves to achieve sealed connection between the connecting conduit and the housing and between the connecting conduit and the stationary scroll.

3. The scroll compressor according to claim 1 or 2, wherein, Stop members are provided in the first fluid passage and the second fluid passage, and the stop members limit the position of the connecting conduit in the first fluid passage and the second fluid passage.

4. The scroll compressor according to claim 3, wherein, The check valve (11, 11′, 11") is provided in the first fluid passage, and the connecting conduit (13, 13′, 13") is arranged adjacent to the check valve.

5. The scroll compressor according to claim 4, wherein, The check valve includes a valve seat with a valve seat through hole, a valve plate for opening or closing the valve seat through hole, and a thrust member. The valve plate is located between the valve seat and the thrust member. Wherein, the valve seat and the thrust member are arranged in the first fluid passage in a threaded connection or interference fit manner.

6. The scroll compressor according to claim 5, wherein, The thrust member is arranged adjacent to the connecting conduit and serves as the stop member for limiting the position of the connecting conduit in the first fluid passage.

7. The scroll compressor according to claim 6, wherein, The check valve further includes a biasing member (112, 112′, 112"), the biasing member is configured to push the valve plate towards the valve seat, and the thrust member is configured to accommodate the biasing member and provide a guiding function for the biasing member.

8. The scroll compressor according to claim 3, wherein, The check valve (11, 11′, 11") is disposed in the third fluid passage within the connecting conduit (13, 13′, 13").

9. The scroll compressor according to claim 8, wherein, The check valve includes a valve seat having a valve seat through-hole, a valve disc for opening or closing the valve seat through-hole, and a thrust member. The valve disc is disposed between the valve seat and the thrust member. The valve seat is a separate component disposed in the third fluid passage in a threaded connection or interference fit manner or is a part of the connecting conduit.

10. The scroll compressor according to claim 3, wherein, The check valve (11, 11′, 11") is disposed in the second fluid passage of the stationary scroll.

11. The scroll compressor according to claim 10, wherein, The check valve includes a valve seat having a valve seat through-hole, a valve disc for opening or closing the valve seat through-hole, and a thrust member. The valve disc is disposed between the valve seat and the thrust member. The valve seat is a separate component disposed in the second fluid passage in a threaded connection or interference fit manner or is a part of the second fluid passage.

12. The scroll compressor according to claim 1 or 2, wherein, The stationary scroll includes a split cover portion and a body portion, and the second fluid passage includes a section disposed between the cover portion and the body portion.

Images