A scroll compressor equipped with a discharge silencer arrangement

Abstract

The scroll compressor comprises a compressor shell having a discharge outlet; an orbiting volute; a fixed volute including a discharge passage (16); a discharge pressure volume (17) defined at least partially by the compressor shell and the fixed volute (7); a discharge silencer arrangement (21) fixed to the fixed volute (7) and arranged within the discharge pressure volume (17), the discharge silencer arrangement (21) comprising a first tubular element (28) provided with a silencer inlet (29) fluidly connected to the discharge passage (16), an expansion chamber (33) fluidly connected to an internal volume of the first tubular element (28), and a second tubular element (35) comprising an inlet opening into the expansion chamber (33) and an outlet opening fluidly connected to the discharge pressure volume (17). Figure 5

Description

Title of the invention: A scroll compressor equipped with a discharge silencer arrangement Scope of the invention

[0001] The invention relates to a scroll compressor equipped with a silencer arranged in a discharge pressure volume delimited by a fixed volute and a compressor shell. Background of the invention

[0002] As is known, a scroll compressor comprises:

[0003] - a compressor casing having a discharge outlet,

[0004] - an orbiting volute arranged inside the compressor shell and comprising an orbiting base plate and an orbiting spiral winding extending from the orbiting base plate,

[0005] - a fixed volute arranged inside the compressor casing and comprising a fixed base plate and a fixed spiral winding extending from the fixed base plate, the fixed and orbiting spiral windings defining, with the fixed and orbiting base plates, compression chambers, the fixed volute further comprising a discharge passage which is formed in the fixed base plate, and

[0006] - a discharge pressure volume defined at least partially by the shell of compressor and fixed volute, and being fluidly connected to the discharge passage.

[0007] A large part of the acoustic noise emitted by such a scroll compressor is due to the flow of compressed refrigerant gas from the fixed volute into the discharge pressure volume, typically formed in the upper part of the compressor shell.

[0008] To solve this problem, acoustic silencers are known to be arranged in the discharge pressure volume of the scroll compressor to dampen the acoustic noise emitted through the upper shell part.

[0009] US patent 5667371 discloses a scroll compressor with a silencer assembly comprising a perforated silencer and an upper cap surrounding the perforated silencer and attached to a partition wall arranged inside the compressor shell between a suction volume and a discharge pressure volume. Openings formed in the upper cap allow the compressed refrigerant gas, which has completely passed through the perforations in the silencer, to communicate with a discharge chamber of the scroll compressor.

[0010] Document CN106194755 discloses a scroll compressor with a silencer assembly attached to the fixed end plate of a fixed volute, the silencer assembly comprising a pressure-release chamber communicating with a discharge port of the fixed volute and a discharge pipe. The silencer assembly further includes a closed cavity communicating with a perforated section of the discharge pipe.

[0011] However, while providing improved damping of acoustic noise through diffusion, reflection, and interference of sound waves, such silencer assemblies exhibit increased flow restrictions and pressure losses, thus negatively impacting the overall efficiency of the scroll compressor. Summary of the invention

[0012] An object of the present invention is to provide an improved scroll compressor, which can overcome the disadvantages encountered in conventional scroll compressors.

[0013] Another object of the present invention is to provide a scroll compressor with a discharge silencer arrangement arranged in the discharge pressure volume of the scroll compressor, ensuring improved acoustic attenuation without reducing the efficiency of the compressor.

[0014] According to the invention, such a scroll compressor comprises:

[0015] - a compressor casing having a discharge outlet,

[0016] - an orbiting volute arranged inside the compressor shell and comprising an orbiting base plate and an orbiting spiral winding extending from the orbiting base plate,

[0017] - a fixed volute arranged inside the compressor casing and comprising a fixed base plate and a fixed spiral winding extending from the fixed base plate, the fixed and orbiting spiral windings defining, with the fixed and orbiting base plates, compression chambers, the fixed volute further comprising a discharge passage which is formed in the fixed base plate,

[0018] - a discharge pressure volume defined at least partially by the shell of compressor and fixed volute,

[0019] - an arrangement of discharge silencers fixed to the fixed volute, and in particular to the fixed base plate, and arranged within the discharge pressure volume,

[0020] in which the discharge silencer arrangement comprises a first tubular element provided with a silencer inlet fluidly connected to the discharge passage, an expansion chamber fluidly connected to an internal volume of the first tubular element, and a second tubular element comprising an inlet opening into the expansion chamber and an outlet opening fluidly connected to the discharge pressure volume.

[0021] Such a configuration of the discharge silencer arrangement, and in particular In particular, the provision of a first tubular element with a silencer inlet and an expansion chamber fluidly connected to the discharge pressure volume through a second tubular element provides improved damping of acoustic noise (by diffusion, reflections and interference of sound waves) while reducing pressure losses in the discharge silencer arrangement.

[0022] Consequently, the acoustic behavior and efficiency of the scroll compressor according to the present invention are substantially improved compared to the acoustic behavior and efficiency of prior art scroll compressors.

[0023] The scroll compressor may also include one or more of the following features, taken alone or in combination.

[0024] According to one embodiment of the invention, the discharge silencer arrangement extends over the discharge passage.

[0025] According to one embodiment of the invention, the discharge silencer arrangement comprises a plurality of mounting brackets that are attached to the fixed volute, for example by using screws or bolts. However, other suitable methods, e.g. welding, brazing, or bonding, can be used to attach the discharge silencer arrangement to the fixed volute.

[0026] According to one embodiment of the invention, the compressor shell includes a top cap, and the discharge silencer arrangement is arranged in the discharge pressure volume so that a gap is defined between the top cap and a top surface of the discharge silencer arrangement.

[0027] According to one embodiment of the invention, the first tubular element and the second tubular element extend substantially parallel to each other.

[0028] According to one embodiment of the invention, the first tubular element and / or the second tubular element extends substantially vertically.

[0029] According to one embodiment of the invention, the first tubular element has a circular cross-section.

[0030] According to one embodiment of the invention, the second tubular element has a circular cross-section.

[0031] According to one embodiment of the invention, the first tubular element comprises a first part of a tubular wall adjacent to the inlet of the silencer and delimiting an inlet chamber, and a second part of a tubular wall comprising orifices opening into the expansion chamber.

[0032] According to one embodiment of the invention, the first tubular element comprises a first open end defining the silencer inlet and a second open end which is away from the silencer inlet and which is fluidly connected to the discharge pressure volume.

[0033] According to one embodiment of the invention, the second tubular element comprises a first open end defining the inlet opening and a second open end defining the outlet opening.

[0034] According to one embodiment of the invention, the second open end of the first tubular element opens into the discharge pressure volume.

[0035] According to one embodiment of the invention, the outlet of the second tubular element opens into the discharge pressure volume. Thus, the second tubular element provides fluid communication between the expansion chamber and the discharge pressure volume.

[0036] According to one embodiment of the invention, the discharge silencer arrangement comprises an outlet chamber provided with a silencer outlet opening into the discharge pressure volume.

[0037] According to one embodiment of the invention, the silencer outlet opens into the discharge pressure volume at a predetermined separation distance from the discharge outlet to allow communication between the discharge pressure volume and a flow of compressed refrigerant gas exiting the silencer outlet.

[0038] According to one embodiment of the invention, the silencer outlet is directed to the discharge outlet provided on the compressor housing. Furthermore, a more regular and direct flow from the discharge silencer arrangement to the discharge outlet is created, with minimized turbulence and pressure losses, which contributes to improving the efficiency of the scroll compressor. In addition, the relatively hot, pulsating flow of compressed refrigerant gas is prevented from directly striking the inner surface of the compressor housing's upper cap, thereby reducing acoustic noise and the external surface temperature of said upper cap.

[0039] According to one embodiment of the invention, the second open end of the first tubular element opens into the outlet chamber.

[0040] According to one embodiment of the invention, the outlet opening of the second tubular element opens into the outlet chamber. Thus, the second tubular element provides fluid communication between the expansion chamber and the outlet chamber.

[0041] According to one embodiment of the invention, the second tubular element is at least partially arranged in the outlet chamber.

[0042] According to one embodiment of the invention, the discharge silencer arrangement comprises a bottom wall, a side wall and an intermediate wall, the expansion chamber being delimited by the bottom wall, the side wall, the first tubular element and the intermediate wall.

[0043] According to one embodiment of the invention, the outlet chamber is located above the expansion chamber.

[0044] According to one embodiment of the invention, the bottom wall and / or the intermediate wall extends substantially horizontally.

[0045] According to one embodiment of the invention, the second tubular element is provided on the intermediate wall.

[0046] According to one embodiment of the invention, the second tubular element protrudes from an upper face of the intermediate wall, and extends in particular upwards from the upper face of the intermediate wall.

[0047] According to one embodiment of the invention, the first tubular element extends downwards from a lower face of the intermediate wall.

[0048] According to one embodiment of the invention, the side wall of the discharge silencer arrangement has an overall cylindrical shape.

[0049] According to one embodiment of the invention, the first tubular element protrudes from an underside of the bottom wall.

[0050] According to one embodiment of the invention, the discharge silencer arrangement comprises an upper wall, the outlet chamber being delimited by the upper wall, the side wall and the intermediate wall, the intermediate wall separating the expansion chamber and the outlet chamber.

[0051] According to one embodiment of the invention, the discharge silencer arrangement comprises a silencer body including a bottom wall, a top wall, a side wall, and an intermediate wall. Advantageously, the intermediate wall is arranged inside an internal volume of the silencer body.

[0052] According to one embodiment of the invention, the expansion chamber is annular and surrounds the first tubular element.

[0053] According to one embodiment of the invention, the scroll compressor further comprises an intermediate portion that fluidly connects the discharge passage formed in the fixed volute to the silencer inlet in a continuous manner. Such arrangements prevent turbulence and pressure losses of the compressed refrigerant gas between the fixed volute and the discharge silencer arrangement, and contribute to increasing the overall efficiency of the scroll compressor.

[0054] According to one embodiment of the invention, the intermediate part is arranged in the discharge passage.

[0055] According to one embodiment of the invention, the intermediate part includes a refrigerant fluid guiding part having an internal circumferential surface which converges towards the silencer inlet and which is configured to guide a flow of compressed refrigerant gas, flowing through the discharge passage, towards the silencer inlet.

[0056] According to one embodiment of the invention, the intermediate part includes a mounting part in which is mounted, for example mounted in a sealed manner, a lower end part of the first tubular element, and in particular of the first tubular wall part.

[0057] According to one embodiment of the invention, the intermediate part has an annular shape.

[0058] According to one embodiment of the invention, the arrangement of the discharge silencers is made in one piece.

[0059] According to one embodiment of the invention, the discharge silencer is made of a polymer material compatible with the refrigerant and lubricating oil used in the scroll compressor, and which resists the discharge temperatures reached under the operating conditions of the scroll compressor.

[0060] According to one embodiment of the invention, the arrangement of the discharge silencers is made by molding or additive manufacturing processes.

[0061] According to one embodiment of the invention, the discharge silencer arrangement includes reinforcing structures, e.g. reinforcing ribs, provided on an external surface of at least one part of the silencer of the discharge silencer arrangement, e.g. on external surfaces of the top wall, bottom wall and / or side wall, to further minimize the vibrations of said at least one part of the silencer and the transmission of acoustic noise to the outside of the compressor shell.

[0062] These advantages and others will become apparent from the reading of the following description in view of the attached drawing representing, by way of non-limiting examples, two embodiments of a spiral compressor according to the invention. Brief description of the drawings

[0063] The following detailed description of an embodiment of the invention is best understood when read in conjunction with the accompanying drawings, it being understood, however, that the invention is not limited to the specific embodiments disclosed.

[0064] Fig. 1 is a longitudinal cross-sectional view of a spiral compressor according to a first embodiment of the invention.

[0065] Fig. 2 is a longitudinal sectional view of a discharge silencer arrangement of the scroll compressor of Fig. 1.

[0066] Fig. 3 is a front view of the discharge silencer arrangement of Fig. 2.

[0067] Fig. 4 is a perspective view of the discharge silencer arrangement of Fig. 2.

[0068] [Fig.5] is an enlarged view of a detail of [Fig.1].

[0069] Figure 6 is a partial longitudinal cross-sectional view of a scroll compressor according to a second embodiment of the invention. Detailed description of the invention

[0070] Fig. 1 describes a spiral compressor 1 according to the invention occupying a vertical position.

[0071] The scroll compressor 1 comprises a compressor housing 2 having a suction inlet 3 configured to supply the scroll compressor 1 with refrigerant to be compressed, and a discharge outlet 4 configured to discharge the compressed refrigerant. The discharge outlet 4 is advantageously provided on a side wall of an upper cap of the compressor housing 2.

[0072] The scroll compressor 1 further comprises a support arrangement 5 fixed to the compressor shell 2, and a compression unit 6 arranged inside the compressor shell 2 and supported by the support arrangement 5. The compression unit 6 is configured to compress the refrigerant supplied by the suction inlet 3. The compression unit 6 comprises a fixed volute 7, which is fixed relative to the compressor shell 2, and an orbiting volute 8 supported by and in sliding contact with a thrust bearing surface 9 provided on the support arrangement 5.

[0073] The fixed volute 7 comprises a fixed base plate 11 having a lower face oriented towards the orbiting volute 8, and a upper face opposite to the lower face of the fixed base plate 11. The fixed volute 7 also comprises a fixed spiral winding 12 projecting from the lower face of the fixed base plate 11 towards the orbiting volute 8.

[0074] The orbiting volute 8 comprises an orbiting base plate 13 having an upper face oriented towards the fixed volute 7, and a lower face opposite the upper face of the orbiting base plate 13 and slidably mounted on the thrust bearing surface 9. The orbiting volute 8 also comprises an orbiting spiral winding 14 projecting from the upper face of the orbiting base plate 13 towards the fixed volute 7. The orbiting spiral winding 14 of the orbiting volute 8 meshes with the fixed spiral winding 12 of the fixed volute 7 to form a plurality of compression chambers 15 between them. Each of the compression chambers 15 has a variable volume that decreases from the outside to the inside when the orbiting volute 8 is driven into orbit relative to the fixed volute 7.

[0075] The fixed volute 7 further comprises a discharge passage 16 which is formed in a central portion of the fixed base plate 11 and which is fluidly connected to the compression chambers 15. The discharge passage 16 is also finished- simply linked to a discharge pressure volume 17 defined by the compressor shell 2 and the fixed volute 7.

[0076] Furthermore, the spiral compressor 1 includes a drive shaft 18 which extends vertically and is configured to drive the orbiting volute 8 in an orbital motion, and an electric drive motor 19, which may be, for example, a variable speed electric drive motor, coupled to the drive shaft 18 and configured to rotate the drive shaft 18 around an axis of rotation A.

[0077] The scroll compressor 1 also includes a discharge silencer arrangement 21 arranged in the discharge pressure volume 17 such that a gap is defined between the upper cap of the compressor housing 2 and an upper surface of the discharge silencer arrangement 21. Advantageously, the discharge silencer arrangement 21 is fixed to the fixed volute 7, and in particular to the fixed base plate 11, for example by using screws or bolts. However, other suitable methods, e.g., welding, brazing, or bonding, may be used to fix the discharge silencer arrangement 21 to the fixed volute 7. The discharge silencer arrangement 21 may include a plurality of mounting lugs 22 that are fixed to the fixed volute 7.

[0078] The discharge silencer arrangement 21 comprises a silencer body 23 having, for example, a generally cylindrical shape and being made in one piece. The silencer body 23 may be made of a polymer material compatible with the refrigerant and lubricating oil used in the scroll compressor 1, and which withstands the discharge temperatures reached under the operating conditions of the scroll compressor 1. Advantageously, the silencer body 23 is produced by molding or additive manufacturing processes.

[0079] The silencer body 23 comprises a bottom wall 24, an upper wall 25, also called the top cover, opposite the bottom wall 24, and a side wall 26 connecting the bottom wall 24 to the upper wall 25. The silencer body also comprises an intermediate wall 27 arranged within an internal volume of the silencer body 23 defined by the bottom wall 24, the upper wall 25, and the side wall 26. The intermediate wall 27 is in particular arranged between the bottom wall 24 and the upper wall 25, and is substantially parallel to the bottom wall 24. According to the embodiment shown in the figures, the bottom wall 24 and the intermediate wall 27 extend horizontally.

[0080] The discharge silencer arrangement 21 also includes a first tubular element 28 having a first open end defining a silencer inlet 29 fluidly connected to the discharge passage 16, and a second open end which is distant from the silencer inlet 29. The first element Tubular 28 can have a circular cross-section.

[0081] The first tubular element 28 includes in particular a first tubular wall portion 28.1 adjacent to the silencer inlet 29 and delimiting an inlet chamber 31, and a second tubular wall portion 28.2 comprising orifices 32. Advantageously, the first tubular element 28 extends downwards from a lower face of the intermediate wall 27 and protrudes from a lower face of the bottom wall 24.

[0082] The discharge silencer arrangement 21 further comprises an expansion chamber 33 delimited by the bottom wall 24, the side wall 26, the first tubular element 28 and the intermediate wall 27. The expansion chamber 33 is fluidically connected to an internal volume of the first tubular element 28 via the orifices 32 which open into the expansion chamber 33. Advantageously, the expansion chamber 33 is annular and surrounds the first tubular element 28.

[0083] Furthermore, the discharge silencer arrangement 21 includes an outlet chamber 34 delimited by the upper wall 25, the side wall 26 and the intermediate wall 27 of the silencer body 23. The outlet chamber 34 is located above the expansion chamber 33, and the intermediate wall 27 separates the outlet chamber 34 from the expansion chamber 33.

[0084] As better illustrated in [Fig. 2], the second open end of the first Tubular element 28 opens into the outlet chamber 34, and the discharge silencer arrangement 21 includes a second tubular element 35 which is provided on the intermediate wall 27 and which fluidly communicates the expansion chamber 33 with the outlet chamber 34. The second tubular element 35 includes a first open end defining an inlet opening leading into the expansion chamber 33, and a second open end defining an outlet opening leading into the outlet chamber 34.

[0085] According to the embodiment shown in the figures, the second tubular element 35 has a circular cross-section, is arranged in the outlet chamber 34, and extends upwards from the upper face of the intermediate wall 27. Advantageously, the first tubular element 28 and the second tubular element 35 extend vertically.

[0086] The outlet chamber 34 is provided with a silencer outlet 36 opening into the discharge pressure volume 17 at a predetermined separation distance from the discharge outlet 4 to allow communication between the discharge pressure volume 17 and a flow of compressed refrigerant gas exiting the silencer outlet 36. Advantageously, the silencer outlet 36 is directed towards the discharge outlet 4 provided on the compressor shell 2.

[0087] According to the embodiment shown in the figure, the arrangement of silencers of discharge 21 includes reinforcing structures 37, e.g. reinforcing ribs, provided on an external surface of at least one part of the silencer of the discharge silencer arrangement 21, e.g. on external surfaces of the top wall 25, bottom wall 24 and / or side wall 26, in order to further minimize the vibration of said at least one part of the silencer and the transmission of acoustic noise to the outside of the compressor shell 2.

[0088] The scroll compressor 1 further comprises an intermediate portion 38 which fluidly connects the discharge passage 16 formed in the fixed volute 7 to the silencer inlet 29 in a continuous manner. According to the embodiment shown in the figures, the intermediate portion 38 has an annular shape and is arranged, for example firmly fixed, in the discharge passage 16. In particular, the intermediate portion 38 comprises:

[0089] - a refrigerant fluid guide portion 38.1 having a circumferential surface internal which converges towards the inlet of silencer 29 and which is configured to guide a flow of compressed refrigerant gas, flowing through the discharge passage 16, towards the inlet of silencer 29, and

[0090] - a mounting part 38.2 in which is mounted, for example, mounting of in a sealed manner, a lower end part of the first tubular element 28, and in particular of the first tubular wall part 28.1.

[0091] The operation of the spiral compressor 1 will now be described.

[0092] When the scroll compressor 1 according to the invention is started, the orbiting volute 8 is driven by the drive shaft 18 in an orbital motion, this motion of the orbiting volute 8 causing an admission and compression of refrigerant in the compression chambers 15. The flow of compressed refrigerant gas exits the compression unit 6 through the discharge passage 16 formed in the central part of the fixed volute 7, and enters the discharge silencer arrangement 21 via the silencer inlet 29. Then, a first part of the flow of compressed refrigerant gas, entering the discharge silencer arrangement 21, flows through the first tubular element 28, enters the outlet chamber 34 and exits the discharge silencer arrangement 21 via the silencer outlet 36.A second part of the compressed refrigerant gas, entering the discharge silencer arrangement 21, enters the expansion chamber 33 via the ports 32 provided on the first tubular element 28, expands in the expansion chamber 33, enters the outlet chamber 34 via the second tubular element 35, and exits the discharge silencer arrangement 21 via the silencer outlet 36. Said first and second parts of the compressed refrigerant gas flow are then directed to the discharge outlet 4, provided on the compressor shell 2, via the silencer outlet 36.

[0093] Such a configuration of the discharge silencer arrangement 21 provides improved damping of acoustic noise by diffusion, reflections and interference of sound waves in the discharge silencer arrangement 21, while reducing pressure losses in the discharge silencer arrangement 21.

[0094] Furthermore, a more regular and direct flow from the discharge silencer arrangement 21 to the discharge outlet 4 with minimized turbulence and pressure losses is created, which helps to further improve the efficiency of the scroll compressor 1. In addition, the relatively hot and pulsating compressed refrigerant gas flow is prevented from directly striking the internal surface of the upper cap of the compressor shell 2, thus further reducing the acoustic noise generated by the scroll compressor 1 and reducing the external surface temperature of said upper cap.

[0095] Figure 6 discloses a scroll compressor 1 according to a second embodiment of the invention which differs from the first embodiment shown in Figures 1 to 5 essentially in that the discharge silencer arrangement 21 is devoid of an outlet chamber, and in that the second open end of the first tubular element 28 opens into the discharge pressure volume 17 and the outlet opening of the second tubular element 35 opens into the discharge pressure volume 17.

[0096] According to such an embodiment of the invention, the expansion chamber 33 is delimited by the bottom wall 24, the side wall 26, the first tubular element 28 and the top wall 25.

[0097] Of course, the invention is not limited to the embodiments described above by way of non-limiting examples, but on the contrary encompasses all embodiments.

Claims

Demands

1. A scroll compressor (1) comprising: - a compressor shell (2) having a discharge outlet (4), - an orbiting volute (8) arranged inside the compressor shell (2) and comprising an orbiting base plate (13) and an orbiting spiral winding (14) extending from the orbiting base plate (13), - a fixed volute (7) arranged inside the compressor shell (2) and comprising a fixed base plate (11) and a fixed spiral winding (12) extending from the fixed base plate (11), the fixed and orbiting spiral windings (12, 14) defining, together with the fixed and orbiting base plates (11, 13), compression chambers (15), the fixed volute (7) further comprising a discharge passage (16) which is formed in the fixed base plate (11), - a volume discharge pressure (17) defined at least partially by the compressor shell (2) and the fixed volute (7),- a discharge silencer arrangement (21) fixed to the fixed volute (7) and arranged in the discharge pressure volume (17), wherein the discharge silencer arrangement (21) comprises a first tubular element (28) provided with a silencer inlet (29) fluidly connected to the discharge passage (16), an expansion chamber (33) fluidly connected to an internal volume of the first tubular element (28), and a second tubular element (35) comprising an inlet opening into the expansion chamber (33) and an outlet opening fluidly connected to the discharge pressure volume (17).

2. Scroll compressor (1) according to claim 1, wherein the first tubular element (28) comprises a first tubular wall portion (28.1) adjacent to the silencer inlet (29) and delimiting an inlet chamber (31), and a second tubular wall portion (28.2) comprising orifices (32) opening into the expansion chamber (33).

3. Spiral compressor (1) according to claim 1 or 2, wherein the first tubular element (28) comprises a first open end defining the inlet of silencer (29) and a second open end which is away from the inlet of silencer (29) and which is fluidly connected to the discharge pressure volume (17).

4. Spiral compressor (1) according to claim 3, wherein the second open end of the first tubular element (28) opens into the discharge pressure volume (17).

5. Spiral compressor (1) according to any one of claims 1 to 4, wherein the outlet opening of the second tubular element (35) opens into the discharge pressure volume (17).

6. Scroll compressor (1) according to any one of claims 1 to 3, wherein the discharge silencer arrangement (21) comprises an outlet chamber (34) provided with a silencer outlet (36) opening into the discharge pressure volume (17).

7. Spiral compressor (1) according to claims 3 and 6, wherein the second open end of the first tubular element (28) opens into the outlet chamber (34).

8. Spiral compressor (1) according to claim 6 or 7, wherein the outlet opening of the second tubular element (35) opens into the outlet chamber (34).

9. Scroll compressor (1) according to any one of claims 6 to 8, wherein the silencer outlet (36) is directed towards the discharge outlet (4) provided on the compressor shell (2).

10. Spiral compressor (1) according to any one of claims 6 to 9, wherein the second tubular element (35) is at least partially arranged in the outlet chamber (34).

11. Spiral compressor (1) according to any one of claims 6 to 10, wherein the discharge silencer arrangement (21) comprises a bottom wall (24), a side wall (26) and an intermediate wall (27), the expansion chamber (33) being delimited by the bottom wall (24), the side wall (26), the first tubular element (28) and the intermediate wall (27).

12. Spiral compressor (1) according to claim 11, wherein the discharge silencer arrangement (21) comprises an upper wall (25), the outlet chamber (34) being delimited by the upper wall (25), the side wall (26) and the intermediate wall (27), the intermediate wall (27) separating the expansion chamber (33) and the outlet chamber (34).

13. Spiral compressor (1) according to any one of claims 1 to 12, wherein the expansion chamber (33) is annular and surrounds the first tubular element (28).

14. Spiral compressor (1) according to any one of claims 1 to 13, further comprising an intermediate part (38) which fluidly connects the discharge passage (16) formed in the fixed volute (7) to the silencer inlet (29) in a continuous manner.

15. Spiral compressor (1) according to claim 14, wherein the intermediate part (38) is arranged in the discharge passage (16).

16. Scroll compressor (1) according to claim 14 or 15, wherein the intermediate part (38) comprises a refrigerant fluid guide part (38.1) having an internal circumferential surface which converges towards the silencer inlet (29) and which is configured to guide a flow of compressed refrigerant gas, flowing through the discharge passage (16), towards the silencer inlet (29).

17. Spiral compressor (1) according to any one of claims 14 to 16, wherein the intermediate part (38) comprises a mounting part (38.2) in which is mounted a lower end part of the first tubular element (28).

18. Scroll compressor (1) according to any one of claims 1 to 17, wherein the discharge silencer arrangement (21) is made in one piece.

19. Scroll compressor (1) according to any one of claims 1 to 18, wherein the discharge silencer arrangement (21) comprises reinforcement structures (37) provided on an external surface of at least one silencer portion of the discharge silencer arrangement (21), to further minimize the vibration of said at least one silencer portion and the transmission of acoustic noise to the outside of the compressor shell (2).

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