Scroll machine with injection and refrigeration system

Abstract

A scroll machine with an injection for a medium has a machine housing with a longitudinal axis. A first scroll unit with scroll channel is formed by a scroll rib. A second scroll unit has a first side and a second side opposite the first side. A scroll channel formed by a second scroll rib is provided on the first side, and a high-pressure chamber is arranged on the second side of the second scroll unit and connected with the scroll channel via a passage. These are arranged in the machine housing along the longitudinal axis. The first scroll unit and the second scroll unit engage with each other to form pressure chambers. The first scroll unit can be moved relative to the second scroll unit along an orbital path. An intermediate base is provided along the longitudinal axis between the second scroll unit and the high-pressure chamber.

Claims

1. A scroll machine (2) with an injection for a medium, having a machine housing (10) with a longitudinal axis (X), wherein a first scroll unit (100) with scroll channel (120) formed by a scroll rib (110), a second scroll unit (200) with a first side (201) and a second side (202) opposite the first side (201), wherein a scroll channel (220) formed by a second scroll rib (210) is provided on the first side (201), and a high-pressure chamber (30) which is arranged on the second side (202) of the second scroll unit (200) and connected with the scroll channel (220) via a passage (260) in the second scroll unit (200), and an intermediate base (50) are arranged in the machine housing (10) along the longitudinal axis (X), wherein the first scroll unit (100) and the second scroll unit (200) engage with each other to form pressure chambers, wherein the first scroll unit (100) can be moved relative to the second scroll unit (200) along an orbital path, wherein an intermediate base (50) is provided along the longitudinal axis (X) between the second scroll unit (200) and the high-pressure chamber (30), wherein a line (70) is provided for injecting the medium, which line connects a housing port (13) with an injection port (270) in the scroll channel (220) of the second scroll unit (200), and wherein the line (70) is routed from the housing port (13) past the high-pressure chamber (30) so as to bypass the high-pressure chamber (30) through the intermediate base (50), wherein the intermediate base (50) is held supported on the machine housing (10) on the side facing the second scroll unit (200) by means of an axial lock (58) or a shoulder of the machine housing (10), and wherein the intermediate base (50) encloses the high-pressure chamber (30) together with the machine housing (10).

2. The scroll machine (2) according to claim 1, characterized in that the intermediate base (50) is supported on the machine housing (10).

3. The scroll machine (2) according to claim 1, characterized in that the line (70) has a first intermediate space (71), the first intermediate space (71) being arranged between the intermediate base (50) and the machine housing (10).

4. The scroll machine (2) according to claim 1, characterized in that the first intermediate space (71) is formed by a preferably circumferential radial groove (63) in a cylindrical lateral surface of the intermediate base (50) and/or a cylindrical surface of the machine housing (10).

5. The scroll machine (2) according to claim 1, characterized in that the line (70) in the intermediate base (50) comprises a first line section (71) and a second line section (72), and that the first line section (71) and the second Line section (72) are arranged in an L-shape.

6. The scroll machine (2) according to claim 5, characterized in that the first line section (71) is oriented in a radial direction with respect to the longitudinal axis and the second line section (72) is oriented in an axial direction.

7. The scroll machine (2) according to claim 1, characterized in that the line (70) in the intermediate base (50) comprises at least two lines (70) connected in parallel.

8. The scroll machine (2) according to claim 1, characterized in that the second scroll unit (200) is supported on the intermediate base (50) so that it can move axially.

9. The scroll machine (2) according to claim 1, characterized in that the line (70) comprises a second intermediate space (72), the second intermediate space (72), preferably along the longitudinal axis (X), being arranged between the intermediate base (50) and the second scroll unit (200).

10. The scroll machine (2) according to claim 9, characterized in that the second intermediate space (62) is annular.

11. The scroll machine (2) according to claim 9, characterized in that the second intermediate space (62) is formed by annular projections (55, 251, 252) arranged telescopically along the longitudinal axis (X).

12. The scroll machine (2) according to claim 9, characterized in that the second intermediate space (62) is sealed by sealants (57) on the annular projections (55, 251, 252).

13. The scroll machine (2) according to claim 1, characterized in that the injection port (270) comprises a recess (242) in the scroll rib (210).

14. The scroll machine (2) according to claim 1, characterized in that the injection port (270) is arranged in a scroll channel base (230).

15. The scroll machine (2) according to claim 14, characterized in that the injection port (270) extends above a transition area (235) between the scroll channel base (230) and the scroll rib (210) and has a first port section (271) in the scroll channel base (230) and a second port portion (272) formed by the recess (242) in the scroll rib (210).

16. The scroll machine (2) according to claim 1, characterized in that the injection port (270) is formed by a stepped opening connecting the first face (201) to the opposite second face (202) of the second scroll unit (200).

17. The scroll machine (2) according to claim 1, characterized in that the line (70) and/or the injection port comprises a check valve (48).

18. The scroll machine (2) according to claim 1, characterized in that the line (70) is insulated and/or that the side of the intermediate base (50) facing the high-pressure chamber (30) has thermal insulation.

19. The scroll machine (2) according to claim 1, characterized in that the second scroll unit (200) is stationary.

20. The scroll machine (2) according to claim 1, characterized in that the second scroll unit (200) is connected to a main bearing housing (300) and surrounds the first scroll unit (100) with the main bearing housing (300).

21. A scroll machine (2) with an injection for a medium, having a machine housing (10) with a longitudinal axis (X), wherein a first scroll unit (100) with scroll channel (120) formed by a scroll rib (110), a second scroll unit (200) with a first side (201) and a second side (202) opposite the first side (201), wherein a scroll channel (220) formed by a second scroll rib (210) is provided on the first side (201), and a high-pressure chamber (30) which is arranged on the second side (202) of the second scroll unit (200) and connected with the scroll channel (220) via a passage (260) in the second scroll unit (200), are arranged in the machine housing (10) along the longitudinal axis (X), wherein the first scroll unit (100) and the second scroll unit (200) engage with each other to form pressure chambers, wherein the first scroll unit (100) can be moved relative to the second scroll unit (200) along an orbital path, wherein an intermediate base (50) is provided along the longitudinal axis (X) between the second scroll unit (200) and the high-pressure chamber (30), wherein a line (70) is provided for injecting the medium, which line connects a housing port (13) with an injection port (270) in the scroll channel (220) of the second scroll unit (200), and wherein the line (70) is routed from the housing port (13) past the high-pressure chamber (30) through the intermediate base (50) characterized in that the high-pressure chamber (30) is connected to an outlet (12) via a pressure connection (40), the pressure connection (40) being arranged in a plane transverse to the longitudinal axis (X) offset from a passage (260) comprising an outlet port (262).

22. The scroll machine (2) according to claim 1, characterized in that a backflow area (45) is provided which forces an S-shaped flow path from the passage (260) through a pressure connection (40) to the outlet (12).

23. The scroll machine (2) according to claim 22, characterized in that the return flow area (45) is formed by a recess (59) formed in the intermediate base (50) on the side facing the high-pressure chamber (30) and the pressure connection (4) projecting towards the recess (59).

24. The scroll machine (2) according to claim 22, characterized in that the pressure connection (40) is operatively connected with the intermediate base (50) in a contact area (46) to form the return flow area (45), and in that the contact area (46) is arranged on an imaginary connecting line in a plane perpendicular to the longitudinal axis (X) between the pressure connection (40) and the passage (260).

25. The scroll machine (2) according to claim 22, characterized in that the pressure connection (40) comprises a socket (49) with a check valve.

26. A refrigeration system (1) with a scroll machine (2) according to claim 1.

27. A scroll machine (2) with an injection for a medium, having a machine housing (10) with a longitudinal axis (X), wherein a first scroll unit (100) with scroll channel (120) formed by a scroll rib (110), a second scroll unit (200) with a first side (201) and a second side (202) opposite the first side (201), wherein a scroll channel (220) formed by a second scroll rib (210) is provided on the first side (201), and a high-pressure chamber (30) which is arranged on the second side (202) of the second scroll unit (200) and connected with the scroll channel (220) via a passage (260) in the second scroll unit (200), are arranged in the machine housing (10) along the longitudinal axis (X), characterized in that the first intermediate space (71) is formed by a preferably circumferential radial groove (63) in a cylindrical lateral surface of the intermediate base (50) and/or a cylindrical surface of the machine housing (10), wherein the first scroll unit (100) and the second scroll unit (200) engage with each other to form pressure chambers, wherein the first scroll unit (100) can be moved relative to the second scroll unit (200) along an orbital path, wherein an intermediate base (50) is provided along the longitudinal axis (X) between the second scroll unit (200) and the high-pressure chamber (30), wherein a line (70) is provided for injecting the medium, which line connects a housing port (13) with an injection port (270) in the scroll channel (220) of the second scroll unit (200), and wherein the line (70) is routed from the housing port (13) past the high-pressure chamber (30) through the intermediate base (50).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Two exemplary embodiments of the present invention are described in detail below with reference to the accompanying figures. In the figures:

(2) FIG. 1 shows a greatly simplified and schematic representation of a refrigeration system with a refrigeration cycle, an economizer cycle and with a scroll machine according to the invention,

(3) FIG. 2 shows an enlarged, simplified sectional representation of the scroll machine according to FIG. 1 according to a second exemplary embodiment,

(4) FIG. 3 shows an enlarged detailed representation of the scroll machine according to the first exemplary embodiment,

(5) FIG. 4 shows a sectional representation through the scroll machine along the section line A-A according to FIG. 3,

(6) FIG. 5 shows an enlarged detailed representation of the scroll machine according to the second exemplary embodiment according to FIG. 2,

(7) FIG. 6 shows a sectional representation of the scroll machine along the section line A-A according to FIG. 5, and

(8) FIG. 7 shows a sectional representation of the scroll machine along the section line B-B according to FIG. 5.

DETAILED DESCRIPTION

(9) Identical or functionally identical parts or features are identified with the same reference numerals in the following detailed description of the figures. Furthermore, not all identical or functionally identical parts or features are provided with a reference numeral in the figures.

(10) FIG. 1 shows a preferred embodiment of a refrigeration system 1 with a scroll machine 2, a refrigeration cycle M and an economizer cycle E for injecting a medium into scroll machine 2. Refrigeration system 1 comprises scroll machine 2 designed as a scroll compressor, a condenser 3, a first expansion element 4 and an evaporator 5. A medium, preferably a refrigerant, flows through refrigeration system 1 in the direction indicated by the arrows, first from an outlet 12 of scroll machine 2 in sequence to condenser 3, a heat exchanger 8 described hereinafter, first expansion element 4, evaporator 5 and finally back through an inlet 11 into scroll machine 2.

(11) As can be seen from FIG. 2, an economizer cycle E for an economizer medium flow branches off from a main medium flow at a junction downstream of condenser 3. A remaining refrigeration cycle media flow flows through the previously described refrigeration cycle M from the junction to inlet 11 of scroll machine 2.

(12) Economizer cycle E comprises a second expansion element 7 and heat exchanger 8, with the economizer medium flow first being routed from second expansion element 7 to heat exchanger 8 and then to a housing port 13 of scroll machine 2, which will be described in detail hereinafter.

(13) A solenoid valve 6 can be provided to open or close economizer cycle E.

(14) In heat exchanger 8, the economizer medium flow is used to supercool the refrigeration cycle medium flow.

(15) Two preferred embodiments of scroll machine 2 shown in FIG. 1 are described below with reference to FIGS. 2 to 7.

(16) FIG. 2 shows a greatly simplified sectional representation of scroll machine 2 according to FIG. 1. Scroll machine 2 has a machine housing 10, designated as a whole, which is oriented along a longitudinal axis X. Machine housing 10 can have a plurality of housing sections, with machine housing 10 having a first housing section 10 and a second housing section 10 in the present exemplary embodiment.

(17) A first scroll unit 100, a second scroll unit 200, an intermediate base 50 and a high-pressure chamber 30 are arranged in machine housing 10 along longitudinal axis X.

(18) First scroll unit 100 is coupled via an eccentric bearing 150 to a drive shaft 420 that can be driven by a drive 400, drive shaft 420 being supported on machine housing 10 via a main bearing 350 and a secondary bearing 450. The axis of rotation of drive shaft 420 defines longitudinal axis X in the illustrated exemplary embodiment.

(19) First scroll unit 100 according to FIG. 3 has a first side 101 and a second side 102 opposite first side 101 in the longitudinal axis. Eccentric bearing 150 is coupled to first scroll unit 100 on the side 101 and a first scroll rib 110 is arranged on second side 102, which protrudes along longitudinal axis X and forms a first scroll channel 120.

(20) It can be seen in particular from FIG. 3 that first scroll rib 110 on second side 102 of first scroll unit 100 forms scroll channel 120 with a scroll channel base 130. On the face side, scroll rib 110 also has a first scroll rib tip 180, which can either have a seal or can be designed as a flat tip. Furthermore, first scroll channel 120 can have an inner end section 125 and/or an outer end section 126.

(21) First scroll rib 110 is formed in the form of an evolvent and extends from inner end section 125 to outer end section 126. Inner end section 125 is located radially inward relative to longitudinal axis X and outer end section 126 is located radially outward relative to longitudinal axis X. The at least one scroll channel 120 is U-shaped and is delimited in the radial directions by scroll rib 110 or a scroll rib wall 140 of scroll rib 110 and scroll channel base 130.

(22) Second scroll unit 200 can be stationary and has a first side 201 and a second side 202 opposite first side 201 in longitudinal axis X. A second scroll rib 210 protrudes in longitudinal axis X on first side 201, second scroll rib 210 forming a second scroll channel 220.

(23) On the face side, second scroll rib 210 also has a second scroll rib tip 280, which can either have a seal or can be designed as a flat tip. Furthermore, second scroll channel 220 can have an inner end section 215 and/or an outer end section 216.

(24) Second scroll rib 210 is adapted to first scroll rib 110 and is also formed in the form of an evolvent and extends from inner end section 215 to an outer end section 216. Inner end section 215 is located radially inward with respect to longitudinal axis X and outer end section 216 is located radially outside with respect to longitudinal axis X. The at least one second scroll channel 220 is U-shaped and is delimited in the radial directions by second scroll rib 210 or a scroll rib wall 240 of second scroll rib 210 and second scroll channel base 230.

(25) As shown in FIG. 2, first scroll rib 110 of first scroll unit 100 and second scroll rib 210 of second scroll unit 200 engage with each other or intermesh. First scroll unit 100 can be moved by drive 400 along an orbital path (not shown) relative to second scroll unit 200. A guide device (not shown) prevents first scroll unit 100 from rotating about longitudinal axis X during movement along the orbital path.

(26) When engaging with each other or intermeshing, first scroll rib 110 engages second scroll channel 220 and second scroll rib 210 engages first scroll channel 120. Second scroll rib tip 280 of second scroll rib 210 sealingly engages scroll channel base 130 of first scroll unit 100 and first scroll rib tip 180 of first scroll rib 110 interacts with scroll channel base 230 of second scroll unit 200.

(27) During a movement of first scroll unit 100 along the orbital path, pressure chambers (not shown) are enclosed between first scroll unit 100 and second scroll unit 200, which are shifted depending on outer end section 126, 226 to the inner end section 125, 225, and vice versa.

(28) In the event that scroll machine 2 operates as a scroll compressor or spiral compressor, the enclosed pressure chambers are shifted from outer end section 126, 226 to inner end section 125, 225, with the pressure chambers undergoing a continuous reduction in volume.

(29) In a scroll expander, the pressure chambers undergo a continuous increase in volume and the pressure chambers are displaced from inner end section 125, 225 to outer end section 126, 226.

(30) High-pressure chamber 30 and intermediate base 50 are arranged on second side 202 of second scroll unit 200, intermediate base 50 being arranged along longitudinal axis X between high-pressure chamber 30 and second scroll unit 200. Intermediate base 50 decouples the second scroll unit from the pressure forces in high-pressure chamber 30 and is supported in relation to machine housing 10.

(31) High pressure chamber 30 is connected to second scroll channel 220 via a passage 260, passage 260 comprising an outlet port 262 which is arranged in the area of inner section 215. Outlet port 262, also known as the discharge port, is preferably formed in inner end section 225 of second scroll channel base 230 and passage 260 extends along longitudinal axis X through an opening 52 through intermediate base 50 to high-pressure chamber 30.

(32) High-pressure chamber 30 is in turn connected to outlet 12 and the medium can leave the scroll machine through outlet 12.

(33) High-pressure chamber 30 is surrounded or enclosed by machine housing 10 and intermediate base 50. For this purpose, machine housing 10 or second housing section 10 can be pot-shaped with a recess, wherein intermediate base 50 can close high-pressure chamber 30 in machine housing 10 or second housing section 10 in the manner of a cover or plug. For this purpose, the shapes of the recess of second housing section 10 and intermediate base 50 are adapted to one another, with both the recess and intermediate base 50 preferably having a circular-cylindrical shape and being able to be designed to fit one another precisely.

(34) In order to avoid leakage between intermediate base 50 and machine housing 10, first sealants 56 can be provided.

(35) Intermediate base 50 has a first side and a second side, the first side facing the second scroll unit 200 and the second side facing high pressure chamber 30. Intermediate base 50 comprises opening 52 which is part of the passage and an annular projection 55 projecting on the first side of intermediate base 50 in longitudinal axis X from the first side of intermediate base 50 in the direction of second scroll unit 200. Annular projection 55 can have a radial groove on the free end face. Furthermore, the edges of annular projection 55 can have chamfers, which in particular can simplify installation of second scroll unit 200.

(36) On the first side of intermediate base 50, an axial lock 58 can be arranged in the form of a securing ring that is attached in the machine housing 10, by means of which the position of intermediate base 50 in longitudinal axis X is determined. The axial lock 58 supports intermediate base 50 on machine housing 10 on the side facing second scroll unit 200, as a result of which the pressure forces from high-pressure chamber 30 are essentially decoupled from second scroll unit 200 and are coupled into machine housing 10.

(37) Second scroll unit 200 surrounds annular projection 55 of intermediate base 50 and for this purpose has a first annular projection 251 and a second annular projection 252 on second side 202, first annular projection 251 interacting with an inner lateral surface of annular projection 55 and second annular projection 252 interacting with an outer lateral surface of annular projection 55 of intermediate base 50.

(38) Annular projections 55 of intermediate base 50 and annular projections 251, 252 of the second scroll unit are arranged telescopically and can form a radial bearing for second scroll unit 200, which can allow an axial displacement of second scroll unit 200 relative to intermediate base 50, whereby, for example, manufacturing tolerances can be balanced.

(39) To inject the medium, scroll machine 2 has a line 70 which connects a housing port 13also called economizer inlet-to an injection port 270 in second scroll channel 220 of second scroll unit 200.

(40) With reference to FIGS. 4 and 6, injection port 270 is arranged in second scroll channel 220 between inner end section 215 and outer end section 216, wherein injection port 270, depending on the design of refrigeration system 1 or scroll machine 2, starting midway between inner end portion 215 and outer end portion 216 may be arranged shifted to inner end portion 215 or outer end portion 216.

(41) Line 70 is routed from housing port 13 to injection port 270 through scroll machine 2 in such a way that line 70 is routed past high-pressure chamber 30 and not through high-pressure chamber 30.

(42) For this purpose, line 70, as shown in FIG. 2, is routed past high-pressure chamber 30 from machine housing 10 through intermediate base 50 and then through second scroll unit 200 to injection port 270.

(43) Line 70 has a housing line section 74 in machine housing 10, which is oriented radially according to the enlarged representation in FIG. 3 or 4 and connects housing port 13 to an inner lateral surface of machine housing 10 or second housing section 10.

(44) Furthermore, line 70 in intermediate base 50 has a first line section 71 and a second line section 72. First line section 71 and second line section 72 are arranged in an L-shape, with first line section 71 preferably being formed with a substantially radial orientation and second line section 72 being formed with a substantially axial orientation. First line section 71 and second line section 72 can be formed, for example, by blind holes that intersect at a common intersection.

(45) Referring to FIG. 4, it can be seen that intermediate base 50 should be positioned in machine housing 10 such that fluid communication can be established between first line section 71 and housing line section 74. Housing line section 74 preferably opens, preferably directly, into first line section 71, with housing line section 74 and first line section 71 even more preferably being aligned in aligning fashion. In order to prevent leakage from or into line 70, first sealant 56 described above can be arranged on both sides of line 70 in the longitudinal axis.

(46) Second line section 72 can preferably be routed centrally through annular projection 55 and opens into a second intermediate space 62 which is formed between intermediate base 50 and second scroll unit 200. According to the preferred and illustrated exemplary embodiment, second intermediate space 62 is enclosed by annular projections 251, 252, wherein a second sealant 57 can be arranged in each case between annular projection 55 of the intermediate base and annular projections 251, 252, i.e. radially on the inside and outside. Intermediate space 62 surrounds passage 260.

(47) From second intermediate space 62 the medium can flow from second side 202 to first side 201 of second scroll unit 200 through an opening 275 to injection port 270 in second scroll channel 220. Opening 275 is preferably formed in an axially orientation and can also be formed as a stepped opening 275 whose cross section tapers from a first section 276 to a second section 277 starting from second side 202 to first side 201.

(48) Opening 275 can be designed as a bore. To form the stepped configuration, either opening 275 may be stepped or a nozzle of the desired shape may be inserted into opening 275. In principle, it is also possible to provide a plurality of openings 275 or injection ports 270 instead of a single opening 275 or a single injection port 270. Furthermore, opening 275 and/or injection port 270 can also be designed in the form of a slit or the like.

(49) In particular, the enlarged representation according to FIG. 3 shows that injection port 270 comprises a recess 242 in second scroll rib 210 or in scroll rib wall 240. Recess 242 can be designed in the manner of a circular groove and extends in second scroll rib wall 240 from scroll channel base 230 in the direction of second scroll rib tip 280, it being apparent that recess 242 does not extend to second scroll rib tip 280, but only is formed over approximately 10% of the channel height of second scroll channel 220.

(50) It can also be seen from FIG. 3 that injection port 270 extends over a transition area 235 between second scroll channel base 230 and second scroll rib 210 and has a first port section 271 in second scroll channel base 230 and a second port section 272 in second scroll rib 210, which is formed by recess 242 in scroll rib 210. In this way, injection port 270 can be positioned in such a way that, in particular, a seal on first scroll rib tip 180 of first scroll unit 100 is not guided over injection port 270 during the orbital movement. As a result, damage to both injection port 270 and the seal on first scroll rib tip 180 can be avoided.

(51) FIGS. 5 and 6 show a second preferred and exemplary embodiment of scroll machine 2, with the two exemplary embodiments differing in the design of line 70.

(52) In particular with reference to FIG. 6 it is apparent that line 70 in intermediate base 50 is formed by a plurality of first line sections 71 and second line sections 72 distributed in pairs and connected in parallel over the circumference, said line sections preferably being evenly distributed over the circumference.

(53) In the exemplary embodiment illustrated, line 70 is formed by four first line sections 71 and second line sections 72 connected in parallel and distributed over the circumference about the longitudinal axis X, with first line section 71 being in fluid communication with housing line section 74 via a first intermediate space 61. The number of lines 70 and/or first line sections 71 and/or second line sections 72 connected in parallel can be selected at the discretion of the person skilled in the art.

(54) First intermediate space 61 is formed between machine housing 10 and intermediate base 50, first intermediate space 61 being formed by a radial groove in an outer lateral surface of intermediate base 50 in the illustrated and preferred exemplary embodiment. First intermediate space 61 is formed over the entire circumference of intermediate base 50 and distributes the medium coming from housing line section 74 over the circumference to first line sections 71.

(55) Due to first intermediate space 61, it is not necessary to pay attention to the alignment of intermediate base 50 when inserting intermediate base 50 into the recess of machine housing 10 and, on the other hand, the medium is distributed over the circumference in intermediate base 50, resulting in a symmetrical thermal load from the medium in the intermediate base.

(56) A refinement of the present invention that is not shown provides that line 70, in particular line 70 in intermediate base 50, is thermally insulated. The thermal insulation makes it possible to avoid a large input of heat into the medium to be injected before it enters scroll channel 220. The thermal insulation can be arranged, for example, on the side of intermediate base 50 facing high-pressure chamber 30, or directly around line 70.

(57) The medium can reach outlet 12 from high-pressure chamber 30 via a pressure connection 40, pressure connection 40 preferably being arranged in such a way that the medium cannot flow directly from passage 260 into pressure connection 40. Pressure connection 40 according to the enlarged representation in FIG. 3 protrudes from the side of machine housing 10 facing intermediate base 50 in the direction of intermediate base 50 and, according to FIG. 7, is arranged offset to passage 260 in a plane perpendicular to longitudinal axis X.

(58) In order to bring about a particularly effective reduction of pressure fluctuations in high-pressure chamber 30, a backflow area 45 can be provided, which forces an S-shaped flow path from passage 260 through pressure connection 40 to outlet 12, which is indicated in FIG. 3 by a dotted arrow line.

(59) Return flow area 45 can have a preferably ring-shaped recess 59 on the second side of intermediate base 50, which faces high-pressure chamber 30, which, together with the pressure connection, defines the S-shaped flow path. For this purpose, pressure connection 40 is operatively connected with the intermediate base 50 according to FIG. 7 in a contact area 46, and that the contact area is arranged on an imaginary connecting line in a plane perpendicular to the longitudinal axis X between the pressure connection 40 and the passage 260. As a result, the medium coming from passage 260 must first be deflected in order to enter into recess 59 and from there to reach outlet 12 through pressure connection 40.

(60) A check valve, shown in FIGS. 2, 3 and 5, can be arranged between high-pressure chamber 30 and outlet 12, which check valve 48 preferably comprises socket 49 which accepts a connection, which can be inserted in pressure connection 40.

LIST OF REFERENCE NUMERALS

(61) 1 refrigeration system 2 scroll machine 3 condenser 4 first expansion organ 5 evaporator 6 solenoid valve 7 second expansion organ 8 heat exchanger 9 machine housing 10 first housing section 10 second housing section 10 machine housing 11 inlet 12 outlet 13 housing port 30 high pressure chamber 30 high pressure chamber 40 pressure connection 45 backflow area 46 contact area 48 check valve 49 socket 50 intermediate base 52 opening 55 projection 56 first sealant 57 second sealant 58 axial lock 59 recess 61 first intermediate space 62 second intermediate space 63 radial groove 70 line 71 first line section 72 second line section 74 housing line section 100 first scroll unit 101 first side 102 second side 110 first scroll rib 120 first scroll canal 125 inner end section 126 outer end section 130 first scroll canal base 150 eccentric bearing 180 first scroll rib tip 200 second scroll unit 201 first side 202 second side 210 second scroll rib 220 second scroll canal 225 inner end section 226 outer end section 230 second scroll rib 230 channel base 235 transition area 240 second scroll rib wall 242 recess 251 projection 252 projection 260 passage 262 outlet port 270 injection port 271 first port section 272 second port section 275 opening 276 first section of 275 277 second section of 275 280 second scroll rib tip 300 main bearing housing 350 main bearing 400 drive 420 drive shaft 450 secondary bearing E economizer cycle M refrigeration cycle X longitudinal axis