Scroll compressor including drain check valve assembly having metal-to-metal sealing face

Abstract

A scroll compressor comprises: a compressor housing (2) having a discharge outlet (4); and a discharge one-way valve assembly (18) comprising a valve housing (21) arranged at the discharge outlet (4) and provided with a metal valve seat (24) and a valve member (26) movable between a closed position and an open position. The metal valve seat (24) has a frustoconical or annular sealing surface (25) and the valve member (26) has a metal sealing surface (36) configured to mate with the frustoconical or annular sealing surface (25) when the valve member (26) is in a closed position, the metal valve seat (24) and the valve member (26) are configured to define a linear sealing contact between a metal sealing surface (36) of the valve member (26) and a frustoconical or annular sealing surface (25) of the metal valve seat (24). The valve member (26) includes a valve stem portion (33) and a valve head portion (35) connected to the valve stem portion (33). The valve stem portion (33) includes a stem end portion (41) distal from the valve head portion (35). The rod end portion (41) comprises a tool fixing member (42) configured to allow a tool suitable for moving the valve member (26) to an open position during assembly of the scroll compressor (1) to be temporarily fixed to the rod end portion (41).

Description

Technical Field

[0001] The present invention relates to a scroll compressor, which includes an improved discharge check valve assembly, also known as a discharge check valve assembly, which is arranged at the discharge outlet of the scroll compressor and is fastened to the compressor housing of the scroll compressor. This discharge check valve assembly controls the communication between the discharge chamber of the scroll compressor and the pipeline of the refrigeration system. When the scroll compressor is in operation, the compressed gas will open the normally closed valve to allow the compressed gas to be discharged into the refrigeration system. When the compressor is shut down, the valve member biased by the spring will be pushed to the valve seat and close the valve to prevent the high-pressure refrigerant gas from flowing back from the refrigeration system to the discharge chamber of the scroll compressor. Thereby, the final reverse movement of the scroll element of the scroll compressor can be avoided, and the restart of the scroll compressor is also easy because the scroll compressor is decoupled from the system pressure. Background Art

[0002] US7721757B2 shows a discharge check valve assembly for a scroll compressor, in which a piston element containing a PTFE sealing member cooperates with an annular metal valve seat having a rounded contact surface. Due to the relatively soft polymer sealing material, such a discharge check valve assembly has a very low leakage rate, but the sealing material is subject to wear. Therefore, during the operating life of the scroll compressor, leakage will increase.

[0003] US9506470B2 discloses a scroll compressor having a discharge check valve attached to a gas-tight compressor housing. The discharge check valve comprises a floating disc-shaped metal valve member mating with an annular metal valve seat having a flat contact surface. Compared with a valve member including a sealing gasket, the discharge check valve has improved wear resistance, but at the same time, also has an increased leakage rate. Summary of the invention

[0004] An object of the present invention is to provide a scroll compressor having a discharge check valve assembly which can overcome the disadvantages encountered in conventional scroll compressors.

[0005] Another object of the present invention is to provide a scroll compressor having a discharge check valve assembly having improved sealing performance throughout the operating life of the scroll compressor.

[0006] According to the present invention, the scroll compressor comprises: a compressor housing having a discharge outlet; and a discharge check valve assembly, the discharge check valve assembly comprising:

[0007] a valve housing arranged at the discharge outlet of the compressor housing and fastened gas-tightly to the compressor housing, the valve housing comprising a metal valve seat,

[0008] a valve member which is arranged in the valve housing and which is movable between a closed position, in which the valve member abuts against a metal valve seat, and an open position, in which the valve member is remote from the metal valve seat,

[0009] In which the metal valve seat has a truncated conical or annular sealing surface and the valve member has a metal sealing surface, which is configured to cooperate with the truncated conical or annular sealing surface when the valve member is in a closed position, and the metal valve seat and the valve member are configured to define a linear sealing contact portion between the metal sealing surface of the valve member and the truncated conical or annular sealing surface of the metal valve seat when the valve member is in a closed position.

[0010] The construction of the valve member and the metal valve seat provides a high contact pressure at the sealing area between the valve member and the metal valve, thereby providing good sealing performance. In addition, the metal-to-metal sealing surface ensures less wear and increased service life of the discharge check valve assembly.

[0011] The scroll compressor may also include one or more of the following features, either alone or in combination.

[0012] According to an embodiment of the invention, the linear sealing contact portion is annular.

[0013] According to an embodiment of the present invention, the valve housing comprises an inlet opening, which is fluidly connected to a discharge chamber of a scroll compressor, and an outlet opening, which is configured to be fluidly connected to a refrigerant system, such as a refrigeration or cooling system. Advantageously, the metal valve seat extends around the inlet opening.

[0014] According to an embodiment of the invention, the valve housing has a first end portion arranged inside the compressor housing and a second end portion arranged outside the compressor housing and configured to be connected to the refrigerant system.

[0015] According to an embodiment of the invention, the valve housing is tubular.

[0016] According to an embodiment of the present invention, the metal sealing surface of the valve member has a spherical segment shape, such as a spherical segment, or an annular surface, such as a revolution annular surface.

[0017] According to an embodiment of the present invention, the radius of the metal sealing surface is between 1 and 30 mm, advantageously between 10 and 20 mm.

[0018] According to an embodiment of the invention, the frustoconical or annular sealing surface has a cone half angle of between 20 and 40 degrees, advantageously between 25 and 35 degrees.

[0019] According to an embodiment of the present invention, the discharge check valve assembly further includes a support member disposed within the tubular valve housing and configured to support the valve member and guide the valve member between the closed position and the open position.

[0020] According to an embodiment of the invention, the support member comprises a first axial stop surface and the valve member comprises a second axial stop surface configured to abut against the first axial stop surface when the valve member is in the open position.

[0021] According to an embodiment of the present invention, the support member includes an annular attachment portion fixed to the valve housing and a central support portion configured to support the valve member and guide the valve member between a closed position and an open position.

[0022] According to an embodiment of the present invention, the central support portion is disposed opposite to the metal valve seat relative to the valve member.

[0023] According to an embodiment of the present invention, the central support portion comprises a first support portion which is away from the metal valve seat and is in a disc shape, and a second support portion which is towards the metal valve seat and whose outer surface tapers gradually towards the metal valve seat. Advantageously, the outer surface of the second support portion is in a truncated cone shape.

[0024] According to an embodiment of the invention, the annular attachment portion and the central support portion of the support member are connected to each other by a plurality of connecting arms, for example by three connecting arms, partially defining a plurality of flow openings for the refrigerant gas.

[0025] According to an embodiment of the present invention, each connecting arm protrudes from an outer surface of the central support portion, for example in a radial direction.

[0026] According to an embodiment of the present invention, the valve member includes a valve stem portion and a valve head portion connected to the valve stem portion, and the metal sealing surface is formed at a radially outer portion of the valve head portion.

[0027] According to an embodiment of the present invention, the valve head portion of the valve member is formed at an end portion of the valve stem portion that faces the metal valve seat.

[0028] According to an embodiment of the present invention, the annular attachment portion and the central support portion of the support member are concentrically arranged.

[0029] According to an embodiment of the invention, the valve stem portion is slidably mounted on a support member, for example, a central support portion.

[0030] According to an embodiment of the invention, the valve stem portion comprises a stem end portion which is distal to the valve head portion and which is configured to protrude from the central support portion when the valve member is in the closed position.

[0031] According to an embodiment of the present invention, the rod end portion includes a tool fixing member, for example, provided with a radial annular groove, which is configured to allow a tool to be temporarily fixed to the rod end portion, and the tool is suitable for moving the valve member to an open position during the assembly process of the scroll compressor. For example, a high pressure test must be performed after the compressor housing is welded, that is, after the valve housing is welded to the discharge outlet of the compressor housing. In order to introduce test gas into the high-pressure volume of the scroll compressor, the valve member must be placed in its open position. Providing a tool fixing member on the valve stem portion allows a tool, such as a clamping tool, to be temporarily fixed to the valve stem portion so that the valve member can be subsequently moved to the open position by applying a pulling force to the valve stem portion in an axial direction. For example, the clamping tool may be provided with an elastic snap element, which is configured to be able to snap when pushed toward the tool fixing member in an axial direction.

[0032] According to an embodiment of the invention, the central support portion of the support member comprises a central opening, such as a central hole, for accommodating the valve stem portion of the valve member.

[0033] According to an embodiment of the present invention, the discharge check valve assembly also includes an elastic element, such as a spring member, which is arranged between the valve head portion of the valve member and the surface of the central support portion of the support member facing the valve head portion, and the elastic element is configured to push the valve member to contact the metal valve seat when the scroll compressor is stopped.

[0034] According to an embodiment of the invention, the valve head portion comprises an annular groove which partially accommodates the elastic element.

[0035] According to an embodiment of the present invention, the valve head portion is overall plate-shaped and extends perpendicularly to the valve stem portion.

[0036] According to an embodiment of the present invention, the maximum outer diameter of the central support portion of the support member is at least 90% of the maximum outer diameter of the valve head portion of the valve member. Thus, the support member blocks the backflow of the refrigerant gas toward the scroll compressor for the valve member. This reduces the gas force on the valve member and the closing impact force, and thus improves the stability of the discharge check valve assembly of the present invention.

[0037] According to an embodiment of the present invention, the valve housing includes a first tubular housing portion, which is inserted into the discharge outlet of the scroll compressor and is fastened to the compressor housing, the first tubular housing portion having a first end portion protruding into the compressor housing and a second end portion arranged outside the compressor housing and configured to be connected to a pipeline of a refrigeration system, most of the first tubular housing portion extends to the outside of the scroll compressor, for example, at least 70% of the length of the first tubular housing portion extends outside the scroll compressor.

[0038] According to an embodiment of the present invention, the valve housing further includes a second tubular housing portion, which is arranged inside the compressor housing, the second tubular housing portion having a first end portion and a second end portion, the metal valve seat is formed to be adjacent to, for example, the first end portion of the second tubular housing portion and the second end portion of the second tubular housing portion is fastened to and cooperates with the first end portion of the first tubular housing portion at a predetermined distance from the compressor housing.

[0039] According to an embodiment of the invention, the first and second tubular housing parts are fastened to each other by laser welding, which minimizes any deformation of the first and second tubular housing parts or the support member.

[0040] According to an embodiment of the invention, the annular attachment portion of the support member is located and clamped between the first tubular housing portion and the second tubular housing portion.

[0041] According to an embodiment of the present invention, a discharge check valve assembly is configured to prevent refrigerant from flowing back from a high pressure side of a refrigerant system into a compressor housing, and in particular, into a discharge chamber of a scroll compressor.

[0042] According to an embodiment of the invention, the valve housing and the support member are coaxially arranged.

[0043] According to an embodiment of the invention, the supporting member is in one piece.

[0044] According to an embodiment of the invention, the valve member is in one piece. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The following detailed description of an embodiment of the present invention will be better understood when read in conjunction with the appended drawings, it being understood, however, that the invention is not limited to the particular embodiment disclosed.

[0046] Figure 1 is a longitudinal sectional view of a scroll compressor according to an embodiment of the present invention.

[0047] Figure 2 yes Figure 1 A partial longitudinal cross-sectional view of a scroll compressor showing the discharge check valve assembly in a closed position.

[0048] Figure 3 is a longitudinal cross-sectional view of a discharge check valve assembly in an open position.

[0049] Figure 4 is a front perspective view of a valve member of a discharge check valve assembly.

[0050] Figure 5 yes Figure 4 Rear perspective view of the valve component.

[0051] Figure 6 is a perspective view of a support member of a discharge check valve assembly. DETAILED DESCRIPTION

[0052] Figure 1 A scroll compressor 1 according to an embodiment of the invention is described occupying a vertical position, and is for example a refrigeration scroll compressor.

[0053] The scroll compressor 1 comprises a compressor housing 2, which is provided with a suction inlet 3 configured to supply the refrigerant to be compressed to the scroll compressor 1, and a discharge outlet 4 configured to discharge the compressed refrigerant. The discharge outlet 4 is advantageously arranged on an upper cover of the compressor housing 2.

[0054] The scroll compressor 1 further includes: a support device 5 fixed to the compressor housing 2; and a compression unit 6 disposed inside the compressor housing 2 and supported by the support device 5. The compression unit 6 is configured to compress the refrigerant supplied through the suction inlet 3. The compression unit 6 includes: a fixed scroll 7, which is fixed relative to the compressor housing 2; and an orbiting scroll 8, which is supported by and slidably contacts a thrust bearing surface 9 disposed on the support device 5.

[0055] As is known, the fixed scroll 7 includes a fixed spiral wrap 12, and the orbiting scroll 8 includes an orbiting spiral wrap 14 that meshes with the fixed spiral wrap 12 of the fixed scroll 7 to form a plurality of compression chambers 15 therebetween. Each of the compression chambers 15 has a variable volume that decreases from the outside toward the inside when the orbiting scroll 8 is driven to orbit relative to the fixed scroll 7.

[0056] Furthermore, the scroll compressor 1 includes a drive shaft 16 extending vertically and configured to drive the orbiting scroll 8 to orbit, and an electric drive motor 17 coupled to the drive shaft 16 and configured to drive the drive shaft 16 to rotate about the rotation axis A.

[0057] The scroll compressor 1 further includes a discharge check valve assembly 18, which is arranged in the discharge outlet 4 and is fluidly connected to a discharge chamber 19 at least partially defined by the compressor housing 2. The discharge check valve assembly 18 is particularly configured to prevent refrigerant from flowing back into the discharge chamber 19 and back into the compression chamber 15 from the high pressure side of a refrigerant system, such as a refrigeration or cooling system.

[0058] The discharge check valve assembly 18 includes a valve housing 21, which is arranged at the discharge outlet 4 of the compressor housing 2 and is airtightly fastened to the discharge outlet 4. The valve housing 21 is tubular and has: a first end portion, which is arranged inside the discharge chamber 19 and is provided with an inlet opening 22 leading to the discharge chamber 19; and a second end portion, which is arranged outside the compressor housing 2 and is provided with an outlet opening 23 configured to be fluidically connected to the refrigerant system. In particular, the second end portion of the valve housing 21 is used as a fitting for connecting an external pipe of the refrigerant system.

[0059] According to the embodiment shown in the figures, the valve housing 21 comprises a first tubular housing portion 21.1 which is inserted into the discharge outlet 4 and is fastened to the compressor housing 2. The first tubular housing portion 21.1 has a first end portion protruding into the compressor housing 2 and a second end portion arranged outside the compressor housing 2 and configured to be connected to an external pipe of the refrigeration system. Advantageously, most of the first tubular housing portion 21.1 extends outside the scroll compressor 1. For example, at least 70% of the length of the first tubular housing portion 21.1 extends outside the scroll compressor 1.

[0060] The valve housing 21 further comprises a second tubular housing portion 21.2, which is arranged inside the compressor housing 2. The second tubular housing portion 21.2 has a first end portion, which defines the inlet opening 22, and a second end portion, which is fastened to and cooperates with the first end portion of the first tubular housing portion 21.1 at a predetermined distance from the compressor housing 2. Advantageously, the first tubular housing portion 21.1 and the second tubular housing portion 21.2 are fastened to each other by laser welding, which minimizes any deformation of the first tubular housing portion 21.1 and the second tubular housing portion 21.2.

[0061] The discharge non-return valve assembly 18 further comprises a metal valve seat 24 located within the valve housing 21 and formed at the inner surface of the second tubular housing portion 21.2. Advantageously, the metal valve seat 24 abuts a first end portion of the second tubular housing portion 21.2.

[0062] The metal valve seat 24 is annular and extends around the inlet opening 22, and has a frustoconical sealing surface 25. The frustoconical sealing surface 25 has a cone half angle between 20 and 40 degrees, advantageously between 25 and 35 degrees. According to another embodiment of the present invention, the metal valve seat 24 can have an annular sealing surface 25, and in particular a concave annular sealing surface.

[0063] The discharge check valve assembly 18 also includes a valve member 26 that is disposed within the valve housing 21 and is capable of being in a closed position (see Figure 2) and open position (see Figure 3 ), in which the valve member 26 abuts against the metal valve seat 24, and in which the valve member 26 is away from the metal valve seat 24. According to the embodiment shown in the figures, the valve member 26 is one-piece.

[0064] Furthermore, the discharge check valve assembly 18 includes a support member 27 which is one-piece and is arranged coaxially with the valve member 26 and the valve housing 21 within the valve housing 21 .

[0065] The support member 27 comprises an annular attachment portion 28, which is fixed to the inner surface of the valve housing 21. The annular attachment portion 28 may be snapped in, press-fitted, glued or fastened by retaining elements to the inner surface of the valve housing 21. According to the embodiment shown in the figures, the annular attachment portion 28 is located and clamped between the first tubular housing portion 21.1 and the second tubular housing portion 21.2.

[0066] The support member 27 further comprises a central support portion 29 which is arranged concentrically with the annular attachment portion 28 and is configured to support the valve member 26 and guide the valve member 26 between the closed position and the open position. The central support portion 29 is arranged opposite to the metal valve seat 24 relative to the valve member 26 and is connected to the annular attachment portion 28 by a number of connecting arms 31, for example three connecting arms 31, which protrude from the outer surface of the central support portion 29, for example in the radial direction and are distributed around the central longitudinal axis B of the valve housing 21. The annular attachment portion 28, the central support portion 29 and the connecting arms 31 define a plurality of flow openings 32 for the refrigerant gas.

[0067] According to the embodiment shown in the figure, the central support portion 29 includes a first support portion 29.1 which is away from the metal valve seat 24 and is in the shape of a disc, and a second support portion 29.2 which is facing the metal valve seat 24 and whose outer surface tapers toward the metal valve seat 24. The outer surface of the second support portion 29.2 can be, for example, a truncated cone. Advantageously, the maximum outer diameter of the second support portion 29.2 is smaller than the maximum outer diameter of the first support portion 29.1.

[0068] like Figure 2 and Figure 4 As better shown in , the valve member 26 comprises a stem portion 33 slidably mounted in a central hole 34 provided on the central support 29. Advantageously, the stem portion 33 and the central support 29 extend coaxially with the central longitudinal axis B of the valve housing 21 .

[0069] The valve member 26 further includes a valve head portion 35, which is formed at the end of the valve stem portion 33 facing the metal valve seat 24 and is configured to cooperate with the metal valve seat 24 when the valve member 26 is in the closed position. Advantageously, the valve head portion 35 is plate-shaped as a whole and extends perpendicularly to the valve stem portion 33.

[0070] According to the embodiment shown in the figure, the maximum outer diameter of the central support portion 29 is at least 90% of the maximum outer diameter of the valve head portion 35. Thus, the support member 27 blocks the valve member 26, especially the valve head portion 35, from the reverse flow of the refrigerant gas toward the scroll compressor 1. This reduces the gas force on the valve member 26 and the closing impact force.

[0071] The valve member 26 has a metal sealing surface 36 formed at a radially outer portion of the valve head portion 35 and configured to cooperate with the frustoconical sealing surface 25 of the metal valve seat 24 when the valve member 26 is in the closed position. In particular, the metal valve seat 24 and the valve member 26 are configured to define a linear sealing contact portion between the metal sealing surface 36 of the valve member 26 and the frustoconical sealing surface 25 of the metal valve seat 24 when the valve member 26 is in the closed position. Advantageously, the linear sealing contact portion is annular and extends coaxially with the central longitudinal axis B of the valve housing 21.

[0072] The metal sealing surface 36 of the valve member 26 can have a spherical segment shape, and in particular a convex spherical segment shape, or can be a torus, and in particular a convex torus. Advantageously, the radius of the metal sealing surface 36 is between 1 and 30 mm, for example between 10 and 20 mm. When the metal sealing surface 36 is in the shape of a spherical segment, the radius is the radius of the sphere defining the spherical segment shape, and when the metal sealing surface 36 is a torus, the radius is the short radius of the annulus defining the torus.

[0073] The discharge check valve assembly 18 further comprises an elastic element 37, such as a spring member, which is arranged between the valve head portion 35 of the valve member 26 and the surface of the central support portion 29 facing the valve head portion 35. The elastic element 37 is configured to push the valve member 26 to contact the metal valve seat 24, that is, to the closed position when the scroll compressor 1 is stopped. According to the embodiment shown in the figure, the valve head portion 35 comprises an annular groove 40, which accommodates the end portion of the elastic element 37.

[0074] like Figure 2 and Figure 3As better shown in the figure, the central support portion 29 includes a first axial stop surface 38, which is located on the end surface of the central support portion 29 facing the metal valve seat 24, and the valve head portion 35 includes a second axial stop surface 39, which is configured to abut against the first axial stop surface 38 when the valve member 26 is in the open position.

[0075] According to the embodiment shown in the figures, the valve stem portion 33 comprises a stem end portion 41 which is remote from the valve head portion 35 and which is configured to protrude from the end face of the central support 29 which faces away from the valve head member when the valve member 26 is in the closed position. Advantageously, the stem end portion 41 comprises a tool fixing member 42, for example provided with a radial annular groove, which is configured to allow temporary fixing of a clamping tool (not shown in the figures) which is suitable for moving the valve member 26 to the open position during the assembly process of the scroll compressor 1.

[0076] For example, a high pressure test must be performed after the compressor housing 2 has been welded, i.e. after the valve housing 21 has been welded into the discharge outlet 4 of the compressor housing 2. In order to introduce the test gas into the high pressure volume of the scroll compressor 1, the valve member 26 must be placed in its open position. The provision of a tool fixing member 42 on the valve stem portion 33 allows a clamping tool to be temporarily fixed to the valve stem portion 33 so that the valve member 26 can be subsequently moved to the open position by applying a tensile force to the valve stem portion 33 in the axial direction. For example, the clamping tool may be provided with an elastic snap element, which is configured to snap when pushed toward the tool fixing member 42 in the axial direction.

[0077] In order to clamp the tool fixing member 42 arranged on the valve stem portion 33, the shaft of the clamping tool including the radially flexible end portion is inserted into the valve housing 21 from the second end portion of the valve housing. The clamping tool also includes a guide portion, which is inserted into the valve housing 21 and abuts against the axial step portion formed in the valve housing 21. The shaft of the clamping tool is slidably arranged in the center hole of the guide portion. When the shaft is snapped to the valve stem portion 33, the shaft can be pulled in the direction outside the scroll compressor 1 so that the valve member 26 is in its open position. Applying another pulling force will cause the flexible end portion of the shaft to be elastically deformed, thereby disengaging the elastic snap element from the radial annular groove of the valve stem portion 33. At this time, the clamping tool can be removed from the valve housing 21, and the valve member 26 will return to its closed position due to the elastic element 37.

[0078] The operation of the scroll compressor 1 will now be described.

[0079] When the scroll compressor 1 according to the present invention is started, the orbiting scroll 8 is driven by the drive shaft 16 to perform an orbiting motion, and this motion of the orbiting scroll 8 causes the refrigerant to be sucked and compressed in the compression chamber 15. The compressed refrigerant leaves toward the discharge chamber 19 through the discharge conduit formed in the central portion of the fixed scroll 7, flows into the discharge chamber 19 and passes through the inlet opening 22 of the valve housing 21, overcomes the biasing force applied by the elastic element 37 to move the valve member 26 to the open position, and then flows through the flow opening 32 and the outlet opening 23 of the valve housing 21.

[0080] When the scroll compressor 1 according to the present invention is stopped, the elastic element 37 pushes the valve member 26 to the closed position, which prevents the high-pressure refrigerant from flowing back to the discharge chamber 19. In particular, the specific configuration of the metal sealing surface 36 of the valve member 26 and the truncated conical sealing surface 25 of the metal valve seat 24 enables a high contact pressure at the sealing area between the valve member 26 and the metal valve, thereby having good sealing performance. In addition, the metal-to-metal sealing surface ensures that the discharge check valve assembly 18 has less wear and an increased service life.

[0081] Of course, the invention is not limited to the embodiments described above by way of non-limiting examples, but rather encompasses all its embodiments.

Claims

1. A scroll compressor (1), comprising: A compressor housing (2) having a discharge outlet (4); and a discharge check valve assembly (18), the discharge check valve assembly comprising: a valve housing (21) arranged at the discharge outlet (4) of the compressor housing (2) and fastened gas-tightly to the compressor housing (2), the valve housing (21) comprising a metal valve seat (24), - a valve member (26) arranged in the valve housing (21) and movable between a closed position and an open position, in which the valve member (26) abuts against the metal valve seat (24), and in which the valve member (26) is away from the metal valve seat (24), wherein the valve member (26) comprises a valve stem portion (33) and a valve head portion (35) connected to the valve stem portion (33), and the valve stem portion (33) comprises a stem end portion (41) away from the valve head portion (35), wherein the metal valve seat (24) has a truncated conical or annular sealing surface (25) and the valve member (26) has a metal sealing surface (36), the metal sealing surface being formed at a radially outer portion of the valve head portion (35) and being configured to cooperate with the truncated conical or annular sealing surface (25) when the valve member (26) is in the closed position, the metal valve seat (24) and the valve member (26) being configured to define a linear sealing contact portion between the metal sealing surface (36) of the valve member (26) and the truncated conical or annular sealing surface (25) of the metal valve seat (24) when the valve member (26) is in the closed position, and The rod end portion (41) includes a tool fixing member (42) configured to allow a tool suitable for moving the valve member (26) to the open position during assembly of the scroll compressor (1) to be temporarily fixed to the rod end portion (41).

2. The scroll compressor (1) according to claim 1, wherein: The metal sealing surface (36) of the valve member (26) has a spherical segment shape or a toroidal surface.

3. The scroll compressor (1) according to claim 2, wherein: The diameter of the metal sealing surface (36) is between 1 and 30 mm.

4. The scroll compressor (1) according to any one of claims 1 to 3, wherein: The frustoconical or annular sealing surface (25) has a cone half angle of between 20 and 40 degrees.

5. The scroll compressor (1) according to any one of claims 1 to 4, wherein: The discharge check valve assembly (18) further includes a support member (27) disposed within the tubular valve housing (21) and configured to support the valve member (26) and guide the valve member (26) between the closed position and the open position.

6. The scroll compressor (1) according to claim 5, wherein: The support member (27) includes an annular attachment portion (28) fixed to the valve housing (21) and a central support portion (29) configured to support the valve member (26) and guide the valve member (26) between the closed position and the open position.

7. The scroll compressor (1) according to claim 6, wherein: The annular attachment portion (28) and the central support portion (29) of the support member (27) are connected to each other by a plurality of connecting arms (31) partially defining a plurality of flow openings (32) for refrigerant gas.

8. The scroll compressor (1) according to any one of claims 5 to 7, wherein: The valve stem portion (33) is slidably mounted on the support member (27).

9. The scroll compressor (1) according to claim 6 or 7 or according to claim 8 in combination with claim 6, wherein: The stem end portion (41) is configured to protrude from the central support portion (29) when the valve member (26) is in the closed position.

10. The scroll compressor (1) according to claim 6 or any one of claims 7 to 9 in combination with claim 6, wherein: The discharge check valve assembly (18) further includes an elastic element (37) which is arranged between the valve head portion (35) of the valve member (26) and a surface of the central support portion (29) of the support member (27) facing the valve head portion (35), and the elastic element (37) is configured to push the valve member (26) to contact the metal valve seat (24) when the scroll compressor (1) is stopped.

11. The scroll compressor (1) according to any one of claims 1 to 10, wherein: The valve housing (21) comprises a first tubular housing portion (21.1), which is inserted into the discharge outlet (4) of the scroll compressor (1) and is fastened to the compressor housing (2), the first tubular housing portion (21.1) having a first end portion protruding into the compressor housing (2) and a second end portion arranged outside the compressor housing (2) and configured to be connected to a pipeline of a refrigeration system, most of the first tubular housing portion (21.1) extending outside the scroll compressor (1).

12. The scroll compressor (1) according to claim 11, wherein: The valve housing (21) further includes a second tubular housing portion (21.2), which is arranged inside the compressor housing (2), and the second tubular housing portion (21.2) has a first end portion and a second end portion, the metal valve seat (24) is formed to be adjacent to the first end portion of the second tubular housing portion (21.2), and the second end portion of the second tubular housing is fastened to and cooperates with the first end portion of the first tubular housing portion (21.1) at a predetermined distance from the compressor housing (2).

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