Scroll machine and refrigeration system

Abstract

A scroll machine (2) includes a first spiral unit (14) having a first spiral channel and a second spiral unit (18). The second spiral unit (18) includes: a second spiral channel; a second spiral rib (26) extending along a spiral path curve (82) and having rib flank (28) radially delimiting the second spiral channel; a second spiral channel floor (30) axially delimiting the second spiral channel; and at least one medium channel (32, 54, 66) extending within the second spiral rib (26) for guiding a working medium. The rib flank (28) has at least one outlet opening (68) through which the at least one medium channel (32, 54, 66) opens into the second spiral channel. The at least one outlet opening (68) is arranged is axially spaced apart at a floor distance (70) from the second spiral channel floor (30). A refrigeration system (1) has a scroll machine (2).

Description

[0001] The invention relates to a scroll machine and a refrigeration system.

[0002] Scroll machines are fluid energy machines and various designs of scroll machines are known from the prior art. Scroll machines include, for example, scroll compressors, spiral compressors, and scroll expanders.

[0003] Known scroll machines typically have two cooperating spiral units, each comprising a spiral channel that is radially delimited by a spiral rib and axially delimited in one direction by a floor. The spiral ribs of the spiral units interlock or mesh to form pressure chambers. The spiral rib abuts, with an end face arranged axially opposite the floor, the floor of the respective other spiral unit in a sealing manner.

[0004] Both the spiral channel and the spiral rib forming the spiral channel are in the form of an involute of a circle, with the two spiral units being movable relative to one another. A common design of scroll machines features a stationary spiral unit and a movable spiral unit, wherein the movable spiral unit is moved along an orbital path relative to the stationary spiral unit.

[0005] According to the displacement principle unit, a working medium, such as a refrigerant, is compressed in a compressor by a relative movement of the two spiral units. During this relative movement, the working medium is moved in pressure chambers along the spiral channels from an outer end region to an inner end region and vice versa, wherein the working medium undergoes a change in volume in the corresponding pressure chamber.

[0006] WO 2018 019 372 A1, for example, discloses a generic scroll machine of the type in question, which can be used in a refrigeration system with a refrigerant circuit. Refrigeration systems of this kind can have a variety of uses, for example cooling a secondary fluid such as air or cooling components or equipment. The cooling or heating load of refrigeration systems can vary greatly according to ambient conditions, occupancy levels, and other load requirements.

[0007] One way to improve the overall efficiency of a refrigeration system is, for example, by means of what is known as an economizer circuit. Through an economizer circuit, an economizer media stream diverted from a main media stream is evaporated and used to super-cool a remaining portion of the main media stream. A system of this kind is described, for example, in DE 10 2022 120 678 A1.

[0008] The diverted working medium of the economizer media stream is introduced or injected into a closed pressure chamber in the scroll machine. By switching the injection on or off, it is possible to vary between different operating modes.

[0009] In some applications, for example when using refrigerants with a very high volumetric cooling capacity, such as CO2 (R-744), a very high amount of over-compression can occur. To counteract the effect of over-compression, it is known to remove some of the working medium from the closed pressure chamber before the compression process is completed.

[0010] Both the introduction and the removal of working medium into and from the closed pressure chamber require the construction of inlets and outlets into the pressure chamber. It is known to arrange corresponding openings at the floor or transition from the floor to the spiral rib of one of the spiral units. Corresponding disclosures can be found in DE 10 2022 120 678 A1, U.S. Pat. No. 7,228,710 B2, and U.S. Pat. No. 6,196,816 B1. From U.S. Pat. No. 8,998,595 B2, it is known to arrange an opening on the end face of the spiral rib.

[0011] A disadvantage of the known systems is that, due to the arrangement of the openings, said openings are passed over by the orbiting spiral ribs, thus impairing the sealing effect between the front face of one of the spiral units and the floor of the respective other spiral unit, or damaging seals used on the end face. The arrangement of the openings at the transition from the floor to the spiral rib places the openings in a position that is subject to high stress, for instance, notch effects.

[0012] This is where the present invention starts.

[0013] The objective of the invention is to provide a suitably improved scroll machine. Preferably, an arrangement is to be provided that enables the introduction or removal of working medium into or from the closed pressure chamber of a scroll machine and that has as little impact as possible on the efficiency and service life of the scroll machine.

[0014] The object is achieved according to the invention by a scroll machine having the features of claim 1 and a refrigeration system comprising the features of claim 15.

[0015] Advantageous embodiments and developments of the invention are specified in the dependent claims.

[0016] A scroll machine according to the invention comprises a housing, a first spiral unit that is arranged in the housing and has a first spiral channel, and a second spiral unit that is arranged in the housing, wherein the first spiral unit can be moved relative to the second spiral unit along an orbital path, wherein the first spiral unit and the second spiral unit are arranged in an axially interlocking manner in order to form pressure chambers.

[0017] Preferably, the first spiral unit can be movable along the orbital path and the second spiral unit can be mounted in a fixed position in the housing, or vice versa. It is also possible for the first spiral unit and the second spiral unit each to be movable along the orbital path. Scroll machines of this kind can, for example, operate using the corotating principle.

[0018] Furthermore, the scroll machine preferably has a longitudinal axis, wherein the orbital path is preferably arranged about the longitudinal axis in a plane that is arranged perpendicularly to the longitudinal axis.

[0019] The terms “radial” and “axial” used below preferably describe a corresponding arrangement with respect to the longitudinal axis. The scroll machine is preferably a scroll compressor.

[0020] The second spiral unit comprises:

[0021] a second spiral channel,

[0022] a second spiral rib that extends along a spiral path curve and has a rib flank that radially delimits the second spiral channel,

[0023] a second spiral channel floor that axially delimits the second spiral channel, and

[0024] at least one medium channel that extends within the second spiral rib for guiding a working medium.

[0025] The second spiral channel floor is preferably arranged perpendicularly to the longitudinal axis.

[0026] The spiral path curve is preferably arranged in a plane that is arranged in parallel with the second spiral channel floor.

[0027] The rib flank has at least one outlet opening through which at least one medium channel opens into the second spiral channel.

[0028] The second spiral rib may have a plurality of medium channels of the at least one medium channel and / or a plurality of outlet openings of the at least one outlet opening. In this case, each of the medium channels is preferably associated with one of the outlet openings.

[0029] Preferably, the second spiral rib has two medium channels and two outlet openings, particularly preferably four medium channels and four outlet openings.

[0030] According to the invention, the at least one outlet opening is arranged, in an axially spaced manner, at a floor distance from the second spiral channel floor. This means that at least one outlet opening is arranged outside the mechanically highly stressed, in particular by notch effects, transition region between the second spiral channel floor and the second spiral rib. This makes it possible to introduce a working medium into or remove a working medium from the pressure chamber without further weakening this already highly stressed area.

[0031] The first spiral unit preferably has a first spiral rib that radially delimits the first spiral channel and a first spiral channel floor that axially delimits the first spiral channel. The pressure chambers can be formed in the first spiral channel and the second spiral channel by the relative movement of the first spiral unit to the second spiral unit. For this purpose, an end face of the respective spiral rib of the respective other spiral unit, arranged axially opposite the corresponding spiral channel floor, preferably has a sealing contact with the respective spiral channel floor. The surface of the respective spiral channel floor facing the respective other spiral unit is therefore a functional sealing surface. By arranging the at least one outlet opening so as to be axially spaced apart from the second spiral channel floor, the sealing function or a seal of the end face of the first spiral rib remains unaffected by the at least one outlet opening.

[0032] The at least one medium channel may have a connecting portion, which preferably extends axially. The connecting portion may be formed by one or more holes that are introduced from a rear face of the second spiral channel floor into the second spiral unit. The rear face of the second spiral channel floor is preferably a face of the spiral channel floor axially opposite the second spiral rib. Preferably, the connecting portion is exclusively axial.

[0033] The at least one medium channel preferably has an outlet portion arranged so as to adjoin the outlet opening on one side and adjoin the connecting portion on the other side, wherein the outlet portion is inclined toward the rib flank such that it encloses an outlet angle with the connecting portion of 100° to 170°, preferably 130° to 150°, particularly preferably 140°. The outlet portion is preferably introduced into the spiral rib as a hole from the rib flank. The size of the outlet angle is therefore determined downward, in particular, by the width of the spiral channel and the size of the floor distance.

[0034] In an axial top view, the outlet section is preferably oriented normally relative to the rib flank. The hole axis of the outlet portion may therefore be a normal relative to the rib flank or the spiral path curve in the axial top view. The axial top view preferably corresponds to a projection of the arrangement onto a projection plane arranged perpendicularly to the longitudinal axis.

[0035] The connecting portion may have a plurality of separate sub-channels which extend side-by-side and are arranged so as to adjoin the same outlet portion. This allows the cross-section of the connecting portion through which the working medium flows to be increased, while keeping the notch effect on the rib flank to a minimum. The outlet portion may have a throttling effect. The sub-channels are preferably arranged in parallel with one another and / or in parallel with the longitudinal axis. Preferably, the sub-channels are arranged extending separately such that one web each of the second spiral rib is arranged along the spiral path curve between the individual sub-channels. The connecting portion preferably has exactly two sub-channels.

[0036] The sub-channels are preferably arranged symmetrically to the outlet portion. In particular, if the connecting portion has exactly two sub-channels, the outlet portion is preferably arranged centrally between the sub-channels along the spiral path curve. The hole axis of the outlet portion may therefore be arranged so as to meet the center of the web.

[0037] In a preferred embodiment, the scroll machine is designed such that the connecting portion along the spiral path curve has a connecting portion width and the at least one outlet opening along the spiral path curve has an outlet opening width, wherein the outlet opening width is less than or equal to the connecting portion width. During the relative movement of the two spiral units in relation to one another, the outlet opening is passed over by the first spiral rib, thereby causing an interruption of the sealing line that forms between the first spiral rib and the rib flank of the second spiral rib. By minimizing the outlet opening width, this interruption and subsequently the impact thereof on the efficiency of the scroll machine is minimized.

[0038] Preferably, the at least one outlet opening is arranged spaced apart from a second end face of the second spiral rib by an end face distance, wherein the ratio of the floor distance to the end face distance is in the range of 1 / 3 to 3 / 1 and preferably is 1 / 1. This allows the at least one outlet opening to be arranged so as to be sufficiently spaced apart from highly stressed regions of the spiral unit, in particular the second end faces, and the transition from the second spiral channel floor to a second spiral rib. The stress caused by the at least one outlet opening therefore takes place outside these regions. The second end face preferably forms the end of the second spiral rib, which is arranged so as to be axially opposite the second spiral channel floor.

[0039] The at least one outlet opening may be elliptical or oblong. The elliptical design of the outlet opening results from the manufacturing process when producing the outlet portion as a hole with a round cross-section through the outlet angle. When the at least one outlet opening is designed as an oblong hole, the opening portion preferably has an oval cross-section. The oblong hole is preferably oriented axially with its longest cross-sectional direction. This allows the interruption of the sealing line that forms between the first spiral rib and the rib flank of the second spiral rib along the spiral path curve to be kept as small as possible.

[0040] In one embodiment of the invention, the housing has a housing opening for supplying working medium into the scroll machine, wherein the scroll machine preferably has a supply line that is designed to connect the housing opening to at least one first medium channel of the at least one medium channel. This allows working medium to be supplied into the pressure chamber from outside the scroll machine, for example from an economizer circuit. Preferably, the supply line connects the housing opening to the at least one first medium channel such that it is directly connected to the housing opening and / or the at least one first medium channel.

[0041] The supply line may be arranged in the second spiral unit and / or in or within an intermediate floor adjacent to the second spiral unit. Preferably, the supply line is arranged exclusively in the second spiral unit or in the intermediate floor. The intermediate floor may have an axially arranged intermediate floor groove which is fluidically connected to the connecting portion of the at least one medium channel, in particular arranged so as to be adjacent to the connecting portion, so that the working medium can flow from the supply line into the at least one medium channel.

[0042] Furthermore, it is advantageous if the supply line comprises a non-return valve. The non-return valve preferably prevents the undesired escape of the working medium from the housing via the housing opening, in particular into the economizer circuit.

[0043] The supply line may have an annular groove adjacent to the housing opening. This allows the working medium introduced through the housing opening to be distributed across different medium channels.

[0044] In one embodiment of the invention, a working medium-carrying connection of the second spiral channel to a high-pressure chamber of the scroll machine can be established by means of at least one second medium channel of the at least one medium channel. In particular, in the case of over-compression, working medium can therefore be discharged from the pressure chambers formed by the first spiral unit and the second spiral unit into the high-pressure chamber before the compression process is completed. This can counteract over-compression. The at least one second medium channel may have a high-pressure end that opens into the high-pressure chamber. The high-pressure chamber is arranged axially on the rear face of the second spiral channel floor and is connected to the second spiral channel via a passage in the second spiral unit. The passage is preferably arranged at a radially inner end of the second spiral channel. The compressed working medium can be removed from the high-pressure chamber out of the scroll machine via an outlet of the scroll machine.

[0045] The scroll machine may have an outlet valve for controlling the flow of working media from the second spiral channel via the at least one second medium channel into the high-pressure chamber. The outlet valve may be arranged on the rear face of the second spiral channel floor on the second spiral unit. Preferably, the outlet valve is connected to the connecting portion.

[0046] A refrigeration system according to the invention comprises the scroll machine described above. CO2 or propane, for example, may be used as the working medium in the refrigeration system. Working media of this kind exhibit a very high volumetric cooling capacity.

[0047] It should be noted here that, within the context of this invention, the term refrigeration system is used as a general collective term independent of the cyclical process and that the refrigeration system can also be a refrigeration, air-conditioning, heat pump, ORC, or process-cooling system.

[0048] The refrigeration system may have a circuit with an economizer path and a refrigeration path. The economizer path preferably comprises an expansion element and a heat exchanger, preferably located downstream of the expansion element. Preferably, the refrigeration system is designed such that the main media stream coming from the outlet of the scroll machine is split into an economizer media stream and the refrigeration path media stream, wherein the working medium of the economizer media stream flows through the economizer path and the working medium of the refrigeration path media stream flows through the refrigeration path. The expansion element and heat exchanger of the economizer circuit can be used to cool the working medium in the refrigeration circuit. The economizer path is preferably connected to the housing opening of the scroll machine. The economizer media stream can therefore be introduced into the pressure chambers of the scroll machine via the economizer path.

[0049] An exemplary embodiment of the invention is explained using the following figures. In the drawings:

[0050] FIG. 1 is a schematic representation of a refrigeration system;

[0051] FIG. 2 is a schematic longitudinal sectional view of a first embodiment of a scroll machine;

[0052] FIG. 3a is a schematic longitudinal sectional view of a section of a second embodiment of a scroll machine, in which the sectional plane A-A is marked;

[0053] FIG. 3b is a schematic cross-sectional view of the embodiment shown in FIG. 3a along the sectional plane A-A shown in FIG. 3a;

[0054] FIG. 4a is a schematic longitudinal sectional view of a section of a third embodiment of a scroll machine, in which with the sectional plane A-A is marked;

[0055] FIG. 4b is a schematic cross-sectional view of the embodiment shown in FIG. 4a along the sectional plane A-A shown in FIG. 4a;

[0056] FIG. 5 is a schematic longitudinal sectional view of a fourth embodiment of a scroll machine;

[0057] FIG. 6a is a schematic cross-sectional view of a first embodiment of a second spiral unit, in which detail B is marked;

[0058] FIG. 6b is an enlarged view of the details marked B in FIG. 7a;

[0059] FIG. 6c is a section of a schematic longitudinal sectional view of the embodiment shown in FIG. 7a;

[0060] FIG. 7 is a section of a schematic longitudinal sectional view of a second embodiment of a second spiral unit; and

[0061] FIG. 8 is a group of schematic representations of different embodiments of medium channels.

[0062] FIGS. 1 to 8 show different views of various embodiments. The same reference signs are used for identical and functionally identical parts. For the sake of clarity, not all reference signs are used in every figure.

[0063] FIG. 1 is a schematic representation of a refrigeration system 1 having a scroll machine 2, a refrigeration path M, and an economizer path E for introducing a working medium into the scroll machine 2. The refrigeration system 1 comprises the scroll machine 2 that is designed as a scroll compressor, a condenser 3, a first expansion element 4, and an evaporator 5. A working medium, preferably a refrigerant, flows through the refrigeration system 1 along the direction indicated by arrows, firstly from an outlet 12 of the scroll machine 2 and subsequently to the condenser 3, a heat exchanger 8, the first expansion element 4, the evaporator 5, and finally back into the scroll machine 2 via an inlet 11.

[0064] The economizer circuit E comprises a second expansion element 7 and the heat exchanger 8, wherein the economizer media flow is first led from the second expansion element 7 to the heat exchanger 8 and subsequently to a housing opening 13 of the scroll machine 2. A solenoid valve 6 can open or lock the economizer circuit E. In the heat exchanger 8, the economizer media flow is used to cool the refrigeration circuit media flow.

[0065] FIGS. 2-3b show two similar embodiments of the scroll machine 2 having a housing 10, a first spiral unit 14 that is arranged in the housing and has a first spiral channel 16, and a second spiral unit 18 that is arranged in the housing 10, and a longitudinal axis 20. The first spiral unit 14 can be moved relative to the second spiral unit 18 along an orbital path (not explicitly shown) that is arranged in a plane arranged perpendicularly to the longitudinal axis 20 and extends around the longitudinal axis 20. The first spiral unit 14 and the second spiral unit 18 are arranged so as to interlock axially for forming pressure chambers 21. The first spiral unit 14 can be moved along the orbital path and the second spiral unit 18 is mounted in a fixed position in the housing 10. The terms “radial” and “axial” used here and in the following relate to the longitudinal axis 20.

[0066] The second spiral unit 18 comprises a second spiral channel 22, a second spiral rib 26 having a rib flank 28 that radially delimits the second spiral channel 22, a second spiral channel floor 30 that axially delimits the second spiral channel 22, and a plurality of first medium channels 32 extending within the second spiral rib 26 for guiding the working medium. As shown in FIG. 2, the second spiral channel floor 30 is arranged perpendicularly to the longitudinal axis 20.

[0067] The first spiral unit 14 has a first spiral rib 34 that radially delimits the first spiral channel 16 and a first spiral channel floor 36 that axially delimits the first spiral channel 16. The pressure chambers 21 are formed in the first spiral channel 16 and the second spiral channel 22 by the relative movement of the first spiral unit 14 to the second spiral unit 18. For this purpose, a first end face 38, arranged so as to be axially opposite the second spiral channel floor 30, of the first spiral rib 34 has a sealing contact with the second spiral channel floor 30, and a second end face 40, arranged so as to be axially opposite the first spiral channel floor 36, of the second spiral rib 26 has a sealing contact with the first spiral channel floor 36. The surface of the respective other spiral channel floor 30, 36 facing the respective other spiral unit 14, 18 is therefore a functional sealing surface.

[0068] The illustrations in FIGS. 2 and 3a, in particular, show that the scroll machine 2 has a supply line 42 which is designed such that it connects the housing opening 13 to the first medium channels 32. This allows working medium to be guided into the pressure chambers 21 from the economizer circuit E outside the scroll machine 2. In the embodiment shown in FIG. 2, the supply line 42 is arranged exclusively in an intermediate floor 44 axially adjacent to the second spiral unit 18. The intermediate floor 44 has an intermediate floor groove 46 which is arranged axially on an end face and is arranged so as to be adjacent to the connecting portions 48 of the first medium channels 32 so that the working medium can flow from the supply line 42 into the first medium channels 32.

[0069] As illustrated in FIGS. 3a and 3b, the supply line has an annular groove 50 adjacent to the housing opening 13, by means of which the working medium introduced through the housing opening 13 can be distributed to the first medium channels 32. For this purpose, the supply line 42 of the embodiment shown in FIG. 2 has a plurality of radial portions 52 adjoining the annular groove 50. In contrast, the embodiment shown in FIGS. 4a and 4b has only one radial portion 52, which is directly connected to the housing opening 13.

[0070] As shown in FIG. 5, the supply line 42 may be exclusively arranged in the second spiral unit 18. In the embodiment shown in FIG. 5, the supply line 42 also has the annular groove 50.

[0071] Furthermore, the embodiment shown in FIG. 5 has a second medium channel 54 in addition to the first medium channel 32. The second medium channel also has the connecting portion 48. In contrast to the first medium channel 32, a working medium-carrying connection of the second spiral channel 22 to a high-pressure chamber 56 of the scroll machine 2 can be established by means of the second medium channel 54. Particularly in the case of over-compression, working medium can be discharged from pressure chamber 21 into the high-pressure chamber 56 before the compression process is completed. For this purpose, the second medium channel 54 has a high-pressure end 58 which opens into the high-pressure chamber 56.

[0072] The high-pressure chamber 56 is arranged axially on a rear face 60 of the second spiral channel floor 30 facing away from the second spiral rib 26 and is connected to the second spiral channel 22 via a passage 62 in the second spiral channel floor 30. The passage 62 is arranged at a radially inner end of the second spiral channel 22 (see also FIG. 6). The compressed working medium can be removed from the high-pressure chamber 56 out of the scroll machine 2 via the outlet 12.

[0073] As further shown in FIG. 5, the scroll machine 2 may have an outlet valve 64 for controlling a working medium flow from the second spiral channel 22 through the second medium channel 54 into the high-pressure chamber 56. The outlet valve 64 is arranged on the second spiral unit 18 on the rear face 60 of the second spiral channel floor 30. The outlet valve 64 may be connected to the connecting portion 48.

[0074] Furthermore, it can be seen in FIG. 5 that a non-return valve 19 is provided which can prevent an undesired escape of working medium from the housing opening 13, in particular into the economizer circuit E. The non-return valve 19 may be arranged (as shown in FIG. 5) in a connection socket which is arranged on the housing 10. The non-return valve 19 may also be arranged in the supply line 42 or in the housing opening 13.

[0075] The illustrations in FIGS. 6a-6c show an embodiment of the second spiral unit 18 having a plurality of medium channels 66. In principle, each of the medium channels 66 can be a first medium channel 32 or a second medium channel 54. The features described below are independent of whether the respective medium channel 66 is a first medium channel 32 or a second medium channel 54 in an installation situation and are therefore applicable to both the previously described first medium channels 32 and the previously described second medium channel 54.

[0076] The illustrations in FIGS. 6a-6c clearly show that the rib flank 28 has four medium channels 66 and four outlet openings 68, wherein each of the medium channels 66 opens into the second spiral channel 22, each via one of the outlet openings 68. As shown in FIGS. 6c and 7, each of the outlet openings 68 is arranged so as to be axially spaced apart from the second spiral channel floor 30 at a floor distance 70. This means that the outlet openings 68 are arranged outside a transition region 72, which, in particular, is subject to heavy stress caused by notch effects, between the second spiral channel floor 30 and the second spiral rib 26.

[0077] FIGS. 6a-6c further show that the connecting portion 48 maybe formed by a plurality of holes which may be introduced into the second spiral unit 18 (see also FIG. 7) from the rear face 60 of the second spiral channel floor 30. Each of the medium channels 66 has an outlet portion 74 arranged so as to adjoin the at least one respective outlet opening 68 on one side and adjoin the respective connecting portion 48 on the other side.

[0078] FIG. 7 shows a longitudinal section of an embodiment of the second spiral unit 18. It can be seen from this that the connecting portion 48 of the medium channel 66 is designed to extend exclusively axially. The outlet portion 74 is inclined toward the rib flank 28 such that it encloses an outlet angle 76 with the connecting portion 48 of 130° to 150°, preferably 140°. As indicated by a tool 78 shown in FIG. 7, the outlet portion 74 is preferably introduced as a hole from the rib flank 28 into the second spiral rib 26. The size of the downward outlet angle 76 is therefore, in particular, determined by a width 80 of the second spiral channel and the size of the floor distance 70.

[0079] FIG. 7 also illustrates that the outlet opening 68 is arranged at an end face distance of 94 from the second end face 40 of the second spiral rib 26. The ratio of the floor distance 70 to the end face distance 94 is in the range of 1 / 3 to 3 / 1.

[0080] FIG. 6a shows that the second spiral rib 26 is arranged so as to extend along a spiral path curve 82. In the cross-sectional view and axial top view shown in FIGS. 6a and 6b, the outlet portion 74 is oriented normally relative to the rib flank 28 so that a hole axis 84 of the outlet portion is, in the axial top view, designed as a normal relative to the rib flank 28 or the spiral path curve 82.

[0081] FIGS. 6a-6c further show that the respective connecting portion 48 may have two separate sub-channels 86 which extend in parallel with one another and are arranged so as to adjoin at the same outlet portion 74. The sub-channels 86 are arranged in parallel with the longitudinal axis 20. Along the spiral path curve 82, a web 88 of the second spiral rib 26 is arranged between each of the individual sub-channels 86. The outlet portion 74 is arranged centrally between the sub-channels 86 along the spiral path curve 82. The hole axis 84 of the outlet portion 74 may therefore be arranged so as to meet the center of the web 88.

[0082] FIGS. 8a-8e show that the respective connecting portion 48 along the spiral path curve 82 has a connecting portion width 90 and the respective outlet opening 68 along the spiral path curve 82 has an opening width 92, wherein the outlet opening width 92 is less than or equal to the connecting portion width 90. Various exemplary embodiments are shown in FIG. 8.

[0083] As shown in FIG. 8, the outlet opening 68 may be elliptical (a) or oblong (b, c).

[0084] A plurality of outlet openings 68 may also be provided, which may be elliptical (d, e) and / or oblong (not shown). The plurality of outlet openings 68 is preferably arranged so as to be axially spaced apart. A kind of connecting rib 89 is formed between the axially spaced outlet openings 68. This arrangement of a plurality of outlet openings 68 and the connecting rib 89 between them allows the rib flank 28 to be stabilized.

[0085] FIG. 8 also shows that the connecting portion 48 may only have one sub-channel 86. The elliptical shape of the outlet opening 68 results from the manufacturing process when producing the outlet portion 74 as a hole with a round cross-section through the outlet angle 76. When the outlet opening 68 is oblong, the outlet portion 74 preferably has an oval cross-section. The oblong hole is preferably oriented axially with its longest cross-sectional direction.LIST OF REFERENCE SIGNS1 Refrigeration system

[0087] 2 Scroll machine

[0088] 3 Condenser

[0089] 4 Expansion element

[0090] 5 Evaporator

[0091] 6 Solenoid valve

[0092] 7 Second expansion element

[0093] 8 Heat exchanger

[0094] 10 Housing

[0095] 11 Inlet

[0096] 12 Outlet

[0097] 13 Housing opening

[0098] 14 First spiral unit

[0099] 16 First spiral channel

[0100] 18 Second spiral unit

[0101] 19 Non-return valve

[0102] 20 Longitudinal axis

[0103] 21 Pressure chamber

[0104] 22 Second spiral channel

[0105] 26 Second spiral rib

[0106] 28 Rib flank

[0107] 30 Second spiral channel floor

[0108] 32 First medium channel

[0109] 34 First spiral rib

[0110] 36 First spiral channel floor

[0111] 38 First end face

[0112] 40 Second end face

[0113] 42 Supply line

[0114] 44 Intermediate floor

[0115] 46 Intermediate floor groove

[0116] 48 Connecting portion

[0117] 50 Annular groove

[0118] 52 Radial portion

[0119] 54 Second medium channel

[0120] 56 High-pressure chamber

[0121] 58 High-pressure end

[0122] 60 Rear face

[0123] 62 Passage

[0124] 64 Outlet valve

[0125] 66 Medium channel

[0126] 68 Outlet opening

[0127] 70 Floor distance

[0128] 72 Transition region

[0129] 74 Outlet portion

[0130] 76 Outlet angle

[0131] 78 Tool

[0132] 80 Width

[0133] 82 Spiral path curve

[0134] 84 Hole axis

[0135] 86 Sub-channel

[0136] 88 Web

[0137] 89 Connecting rib

[0138] 90 Connecting portion width

[0139] 92 Outlet opening width

[0140] 94 End face distance

[0141] E Economizer path

[0142] M Refrigeration path

Claims

1. A scroll machine (2) comprisinga housing (10), a first spiral unit (14) arranged in the housing (10) and having first spiral channel, and a second spiral unit (18) arranged in the housing (10), wherein the first spiral unit (14) can be moved relative to the second spiral unit (18) along an orbital path, wherein the first spiral unit (14) and the second spiral unit (18) are arranged so as to axially interlock for forming pressure chambers, and wherein the second spiral unit (18) comprises:a second spiral channel,a second spiral rib (26) extending along a spiral path curve (82) and having rib flank (28) radially delimiting the second spiral channel,a second spiral channel floor (30) axially delimiting the second spiral channel, andat least one medium channel (32, 54, 66) extending within the second spiral rib (26) for guiding a working medium,wherein the rib flank (28) has at least one outlet opening (68) through which the at least one medium channel (32, 54, 66) opens into the second spiral channel,characterized in thatthe at least one outlet opening (68) is arranged, in an axially spaced manner, at a floor distance (70) from the second spiral channel floor (30).

2. The scroll machine (2) according to claim 1,characterized in that the at least one medium channel (32, 54, 66) has a connecting portion (48), which preferably extends axially.

3. The scroll machine (2) according to claim 2,characterized in that the at least one medium channel (32, 54, 66) has an outlet portion (74) arranged so as to adjoin the at least one outlet opening (68) on one side and adjoin the connecting portion (48) on the other side, wherein the outlet portion (74) is inclined toward the rib flank (28) such that it encloses an outlet angle (76) with the connecting portion (48) of 100° to 170°, preferably 130° to 150°, particularly preferably 140°.

4. The scroll machine (2) according to claim 3,characterized in that, in an axial top view, the outlet portion (74) is oriented normally relative to the rib flank (28).

5. The scroll machine (2) according to claim 3,characterized in that the connecting portion (48) has a plurality of separate sub-channels (86) which extend side-by-side and are arranged so as to adjoin the same outlet portion (74).

6. The scroll machine (2) according to claim 5,characterized in that the sub-channels (86) are arranged symmetrically relative to the outlet portion (74).

7. The scroll machine (2) according to claim 1,characterized in that the connecting portion (48), along the spiral path curve (82), has a connecting portion width (90) and the at least one outlet opening (68), along the spiral path curve (82), has an outlet opening width (92), wherein the outlet opening width (92) is less than or equal to the connecting portion width (90).

8. The scroll machine (2) according to claim 1,characterized in that the at least one outlet opening (68) is arranged so as to be spaced apart at an end face distance (94) from a second end face (40) of the second spiral rib (26), wherein the ratio of the floor distance (70) to the end face distance (94) is in the range of 1 / 3 to 3 / 1 and is preferably 1 / 1.

9. The scroll machine (2) according to claim 1,characterized in that the at least one outlet opening (68) is elliptical or oblong.

10. The scroll machine (2) according to claim 1,characterized in that the housing (10) has a housing opening (13) for supplying working medium into the scroll machine (2), wherein the scroll machine (2) has a supply line (42) which is designed so as to connect the housing opening (13) to at least one first medium channel (32) of the at least one medium channel (32, 54, 66).

11. The scroll machine (2) according to claim 10,characterized in that the supply line (42) is arranged in the second spiral unit (18) and / or in an intermediate floor (44) adjacent to the second spiral unit (18).

12. The scroll machine (2) according to claim 10,characterized in that the supply line (42) has an annular groove (50) adjacent to the housing opening (13).

13. The scroll machine (2) according to claim 1,characterized in that a working medium-carrying connection of the second spiral channel (22) to a high-pressure chamber (56) of the scroll machine (2) can be established by means of at least one second medium channel (54) of the at least one medium channel (32, 54, 66).

14. The scroll machine (2) according to claim 11,characterized in that the scroll machine (2) has an outlet valve (64) for controlling a working medium flow from the second spiral channel (22) through the at least one second medium channel (54) into the high-pressure chamber (56).

15. A refrigeration system (1) comprising a scroll machine (2) according to claim 1.

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