Scroll machine with injection and cooling system

Abstract

The present invention relates to a scroll machine (2) with an injection system for a medium, comprising a machine housing (10) with a longitudinal axis (X), wherein in the machine housing (10) along the longitudinal axis (X) are arranged a first spiral unit (100) with a spiral channel (120) formed by a first spiral rib (110), a second spiral unit (200) with a first side (201) and a second side (202) opposite the first side (201), wherein a spiral channel (220) formed by a second spiral 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 spiral unit (200) and is connected to the spiral channel (220) via a passage (260) in the second spiral unit (200), wherein the first spiral unit (100) and the second spiral unit (200) are arranged to form pressure chambers interlockwherein the first spiral unit (100) can be moved along an orbital path relative to the second spiral unit (200), wherein an intermediate floor (50) is provided along the longitudinal axis (X) between the second spiral unit (200) and the high-pressure chamber (30), wherein a line (70) is provided for the injection of the medium, connecting a housing opening (13) with an injection opening (270) in the spiral channel (220) of the second spiral unit (200), and wherein the line (70) is guided from the housing opening (13) past the high-pressure chamber (30) through the intermediate floor (50). Furthermore, the present invention relates to a refrigeration system.

Description

[0001] The present invention relates to a scroll machine with an injection for a medium, in particular a coolant, having the features of patent claim 1 and to a refrigeration system with such a scroll machine having the features of patent claim 25.

[0002] Scroll machines are fluid energy machines and are known in various designs from the state of the art. Examples of scroll machines include scroll compressors, scroll compressors, scroll compressors, and scroll expanders.

[0003] Known scroll machines typically have two interacting spiral units, each with at least one spiral rib forming at least one spiral channel. The spiral ribs of the spiral units interlock or intermeshed to form pressure chambers.

[0004] Both the respective spiral channel and the spiral rib forming the spiral channel are designed in the shape of a circular involute, with the two spiral units being movable relative to each other. A common design of scroll machines has a stationary spiral unit and a movable spiral unit, with the movable first spiral unit being moved along an orbital path relative to a second spiral unit.

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

[0006] For example, WO 2018 019 372 A1 discloses such a scroll machine, which can be used in a refrigeration system with a refrigerant circuit. Such refrigeration systems can be used in a variety of applications, such as cooling a secondary fluid such as air or cooling components or equipment. The cooling or heating load of refrigeration systems can vary greatly depending on the ambient conditions, occupancy level, and other load requirements.

[0007] One way to improve the overall efficiency of a refrigeration system is through an economizer circuit. In an economizer circuit, an economizer medium stream diverted from a main medium stream is evaporated and used to subcool the remaining portion of the main medium stream.

[0008] The diverted medium from the economizer medium flow is introduced or injected into a closed pressure chamber in the scroll machine. Different operating modes can be switched on or off by switching the injection on or off.

[0009] In the past, the above-described scroll machines with injection or refrigeration systems with economizer circuit and a scroll machine with injection have proven successful, but it has been shown that the guidance of the medium to be injected requires a complex component geometry.

[0010] Further prior art includes the documents EP 3 447 113 A1, DE 10 2015 100 112 A1, JP H08 30 3361 A, JP 5 436 982 B2, JP 2016 11620 A and EP 3 578 823 B1.

[0011] It is the object of the present invention to propose a scroll machine and a refrigeration system of the type described at the outset, which expediently eliminates the disadvantages known from the prior art and to provide a scroll machine and a refrigeration system which enable the medium to be injected to be guided to the injection opening in a spiral channel in a simple manner.

[0012] These objects are achieved by a scroll machine having the features of patent claim 1 and a refrigeration system having the features of patent claim 25.

[0013] Further advantageous embodiments of the present invention are specified in the subclaims.

[0014] The scroll machine according to the invention with the features of patent claim 1 with an injection for a medium has a machine housing with a longitudinal axis, wherein a first spiral unit, a second spiral unit and a pressure chamber are arranged in the machine housing along the longitudinal axis. The first spiral unit has a first spiral channel formed by a first spiral rib. The second spiral unit has a first side and a second side opposite the first side in the longitudinal axis, wherein a second spiral channel formed by a second spiral rib is formed on the first side. The high-pressure chamber is arranged on the second side of the second spiral unit in the longitudinal axis and is connected to the second spiral channel via a passage in the second spiral unit, wherein an intermediate floor is provided between the second spiral unit and the pressure chamber.Furthermore, the first spiral unit and the second spiral unit interlock to form pressure chambers, and the first spiral unit can be guided along an orbital path relative to the second spiral unit. A line is provided for the injection of the medium, connecting a housing opening with an injection opening in the second spiral channel. The line is routed from the housing opening to the injection opening past the high-pressure chamber through the intermediate floor.

[0015] The present invention is based on the idea of routing the conductor for supplying the medium to be injected to the second spiral unit, bypassing the high-pressure chamber. Because the conductor is not routed through the high-pressure chamber, the heat input into the medium to be injected is reduced. This measure can improve the efficiency of the scroll machine. The proposed scroll machine also offers a simple design and easy assembly. The intermediate floor decouples the second spiral unit from the pressure forces from the high-pressure chamber, meaning the second spiral unit is subjected to significantly lower forces.

[0016] The present invention provides that the intermediate base is supported on the machine housing. The intermediate base is preferably disc-shaped and can more preferably be in operative contact or abutment with the machine housing over its circumference, wherein the intermediate base is held axially supported on the machine housing in at least one of the two diametrical directions along the longitudinal axis. According to the invention, the intermediate base is held supported on the machine housing by an axial securing device or a shoulder on the machine housing on the side facing the second spiral unit.

[0017] According to the invention, the intermediate floor can house or enclose the high-pressure chamber together with the machine housing. Accordingly, the intermediate floor can form a wall of the high-pressure chamber, wherein even more preferably the intermediate floor can close the high-pressure chamber in the machine housing in the manner of a lid or plug. The machine housing or a machine housing section can be cup-shaped, wherein the intermediate floor can be inserted precisely into a cup-shaped section. The axial securing device described above can be arranged on the side facing away from the high-pressure chamber, such that a pressure applied in the high-pressure chamber pushes or presses the intermediate floor against the axial securing device. This allows the position of the intermediate floor to be easily specified.

[0018] In addition, a first sealing means may be arranged between the intermediate floor and the machine housing, which seals the high-pressure chamber and prevents leakage between the intermediate floor and the machine housing.

[0019] Furthermore, it is preferred if the line, according to a further development of the invention, has a first intermediate space, wherein the first intermediate space is arranged between the intermediate floor and the machine housing. In a preferred embodiment, the intermediate space is enclosed jointly by the intermediate floor and by the machine housing and forms a cross-sectional widening of the line, preferably with respect to the longitudinal axis in a circumferential direction. When installing the intermediate floor, it is therefore not absolutely necessary to position the intermediate floor precisely in or on the machine housing so that the medium to be injected can be transferred from one section of the line in the machine housing to the section(s) of the line in the intermediate floor.

[0020] A preferred development provides that the first intermediate space is formed by a preferably circumferential radial groove in an outer surface of the intermediate base and / or an inner surface of the machine housing. In particular, it is preferred if the intermediate base is designed as a cylindrical cover or plug, and if the first intermediate space is formed by a circumferential radial groove in the outer cylindrical surface, which, on the one hand, enables simple production and, on the other hand, allows the intermediate base to be mounted in the machine housing without considering the orientation.

[0021] Furthermore, it has proven advantageous if the line in the intermediate floor comprises a first line section and a second line section, and if the first line section and the second line section are arranged in an L-shape. Preferably, the first line section and the second line section are each formed along a straight line which intersect at a common intersection point. Even more preferably, the first line section is oriented in a radial direction with respect to the longitudinal axis and the second line section is oriented in an axial direction. The first line section and the second line section can be formed, for example, by a blind hole or by an axial recess or by a primary or forming process in the intermediate floor.It is also conceivable that the line can be formed by one or more tubular conductors which are arranged in a corresponding recess in the intermediate floor.

[0022] Furthermore, it has proven advantageous if the line in the intermediate floor comprises at least two lines connected in parallel. The at least two lines connected in parallel can be distributed over the circumference - preferably evenly - with respect to the longitudinal axis. This allows thermal loading of the intermediate floor to be evenly distributed, in particular over the circumference. Furthermore, pressure losses can be reduced and the effective line cross-section can be increased, whereby further pressure losses can be reduced. This also makes it possible to achieve a homogeneous distribution of the medium to be injected over the circumference, regardless of the orientation and alignment of the intermediate floor. When installing the intermediate floor, alignment of the intermediate floor relative to the machine housing is no longer necessary.

[0023] According to a preferred embodiment, the second spiral unit is arranged axially guided on the intermediate floor. Preferably, the second spiral unit is guided on the intermediate floor by a type of radial bearing, which decouples the second spiral unit from the intermediate floor in terms of forces. This measure exposes the second spiral unit to lower loads, since the intermediate floor absorbs most of the pressure load of the high-pressure chamber.

[0024] Furthermore, it has proven advantageous if the line has a second intermediate space between the intermediate floor and the second spiral unit, which is preferably jointly enclosed by the intermediate floor and the second spiral unit. Preferably, the second intermediate space forms a cross-sectional widening of the line in a circumferential direction with respect to the longitudinal axis. Therefore, when assembling the second spiral unit, it is not necessary to position the second spiral unit aligned with the intermediate floor so that the medium to be injected can be transferred from the section of the line in the intermediate floor to a section of the line in the second spiral unit.

[0025] A preferred embodiment of the present invention provides for the second intermediate space to be annular. The annular configuration of the intermediate space allows the medium to be injected to be distributed evenly on the second side of the second spiral unit.

[0026] Furthermore, a further development of the present invention can provide that the second intermediate space surrounds the passage along the longitudinal axis.

[0027] Furthermore, it may be advantageous if, according to the invention, the second intermediate space is formed by annular projections arranged telescopically along the longitudinal axis. Preferably, the intermediate base and the second spiral unit each have at least one annular projection to form the second intermediate space, with the two annular projections preferably forming the aforementioned radial bearing between the second spiral unit and the intermediate base. The telescopic arrangement of the annular projections allows for tolerance compensation in the axial direction while simultaneously forming the second intermediate space.

[0028] According to a further development, the second intermediate space can be sealed by second sealing means, wherein the second sealing means are preferably arranged on the corresponding annular projections opposite one another in the radial direction.

[0029] According to a further development, the line can be formed in the second spiral unit as an axially oriented opening, in particular a bore. It is preferred if the opening is aligned parallel to the longitudinal axis, thereby keeping the length of the line in the second spiral unit as short as possible. Such a line can be produced in a particularly simple manner.

[0030] Furthermore, according to a further development of the present invention, the injection opening can comprise a recess in the spiral rib. The recess is preferably designed in the manner of a circular groove. Furthermore, the recess can extend from a spiral channel base of the second spiral channel on the first side of the second spiral unit in the axial direction toward a second spiral rib tip, preferably over more than 2% of a channel height of the second spiral channel and preferably not over 50% of the channel height, even more preferably not over 25% of the channel height.

[0031] The recess in the spiral rib should have a depth that is in the range of approximately 25% - 200% of the cross-section of the injection opening.

[0032] Furthermore, it has proven advantageous if the injection opening is arranged, at least in part, in the channel bottom.

[0033] A preferred development of the present invention provides that the injection opening extends over a transition region between the second spiral channel base and the second spiral rib and has a first opening section formed in the second spiral channel base and a second opening section formed by the recess in the second spiral rib. By arranging the injection opening in this way in the transition region between the second spiral channel base and the second spiral rib, it can be avoided that the first spiral rib tip of the first spiral rib of the first spiral unit or a seal of the first spiral rib can come into contact with the injection opening. Such contact could damage both the injection opening and / or the first spiral rib tip or the seal at the spiral rib tip.

[0034] It has also proven advantageous if the section of the line in the second spiral unit is designed as a stepped structure, wherein the stepped structure tapers from the second side of the second spiral unit towards the first side of the second spiral unit. The stepped structure can be realized by a stepped structure of the opening or by a nozzle inserted into the opening. As an alternative to the stepped structure, the opening or the nozzle can also be conical. The opening can preferably be designed as a bore with a circular cross-section. However, it is also possible to design the opening in a crescent shape.

[0035] A further development of the present invention further provides that the line and / or the injection opening comprise a check valve. Preferably, the volume between the injection opening and the check valve is as small as possible, which is why, in a particularly preferred embodiment, the check valve is arranged in the section of the line in the second spiral unit. Likewise, the check valve can be arranged in the line in the region of the intermediate floor or in the line in the machine housing, preferably in the region of the housing opening.

[0036] Furthermore, it may be advantageous if the line is thermally insulated. In addition to thermal insulation around the line, it may also be useful, either additionally or alternatively, to provide thermal insulation on the side of the intermediate floor facing the high-pressure chamber to prevent unnecessary heating of the medium being injected in the line.

[0037] According to a further development of the present invention, the second spiral unit is stationary. Thus, the second spiral unit should preferably not undergo any relative movement with respect to the first spiral unit and the machine housing during normal operation of the scroll machine.

[0038] A further development of the present invention provides that the second spiral unit is connected to a main bearing housing, and that the second spiral unit, together with the main bearing housing, surrounds the first spiral unit.

[0039] According to a further development, the high-pressure chamber can be connected to an outlet via a pressure port. The pressure port can be arranged offset from the passage in a plane transverse to the longitudinal axis and can more preferably be arranged in the pressure chamber along the longitudinal axis on the side opposite the passage. The offset arrangement between the passage and the pressure port is intended to ensure that pressure pulsations caused by viscous processes are reduced and that the medium emerging from the passage cannot flow directly out of the scroll machine through the pressure port.

[0040] A backflow area can be provided in the high-pressure chamber, forcing an S-shaped flow path from the passage through the discharge port to the outlet. This backflow area promotes the dampening of pulsations and reduces pressure fluctuations in the medium discharged through the outlet.

[0041] It has also proven advantageous if the return flow region is formed by a recess formed in the intermediate floor on the side facing the high-pressure chamber and the pressure nozzle, wherein the pressure nozzle projects into the high-pressure chamber oriented towards the recess.

[0042] Furthermore, it has proven advantageous if the pressure nozzle is in operative contact with the intermediate base in a contact area to form the flow area, and that the contact area is arranged on an imaginary connecting line in a plane perpendicular to the longitudinal axis between the pressure nozzle and the passage.

[0043] According to a further development, a check valve can be provided, which is arranged between the high-pressure chamber and the outlet. The check valve can be arranged either in the outlet or in the pressure port, with the check valve particularly preferably being inserted into the pressure port in the form of a bushing. This results in a particularly compact and simple design.

[0044] Another aspect of the present invention relates to a refrigeration system having a scroll machine as described above.

[0045] The refrigeration system preferably has an economizer circuit comprising an expansion element and a heat exchanger. The main medium flow coming from the outlet of the scroll machine is divided into an economizer medium flow and the refrigeration circuit medium flow, with the medium of the economizer medium flow flowing through the economizer circuit. The expansion element and the heat exchanger of the economizer circuit downstream of the expansion element are used to cool the medium in the refrigeration circuit, with the economizer medium flow being guided through the economizer circuit to the housing opening for injection in the scroll machine.

[0046] The following are based on the accompanying Figures two Embodiments of the present invention are described in detail. They show: Figure 1 is a highly simplified and schematic representation of a refrigeration system with a refrigeration circuit, an economiser circuit and with a scroll machine according to the invention, Figure 2 is an enlarged, simplified sectional view of the scroll machine according to Figure 1 according to a second embodiment, Figure 3 is an enlarged detailed view of the scroll machine according to the first embodiment, Figure 4 is a sectional view through the scroll machine along the section line A - A according to Figure 3 , Figure 5 an enlarged detailed view of the scroll machine according to the second embodiment according to Figure 2 , Figure 6 a sectional view of the scroll machine along the section line A - A according to Figure 5 , and Figure 7 a sectional view of the scroll machine along the section line B - B according to Figure 5 .

[0047] Identical or functionally equivalent parts or features are identified by the same reference numerals in the following detailed description of the figures. Furthermore, not all identical or functionally equivalent parts or features are provided with a reference numeral in the figures.

[0048] Figure 1shows a preferred embodiment of a refrigeration system 1 with a scroll machine 2, a refrigeration circuit M and an economizer circuit E for injecting a medium into the scroll machine 2. The refrigeration system 1 comprises the 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 the refrigeration system 1 along the direction marked with arrows, first from an outlet 12 of the scroll machine 2 in the sequence to the condenser 3, a heat exchanger 8 described later, the first expansion element 4, the evaporator 5 and finally back through an inlet 11 into the scroll machine 2.

[0049] How Figure 2can be removed, an economizer circuit E for an economizer media flow branches off from a main medium flow at a branch downstream of the condenser 3. A remaining refrigeration circuit media flow flows through the previously described refrigeration circuit M from the branch to the inlet 11 of the scroll machine 2.

[0050] The economizer circuit E comprises a second expansion element 7 and the heat exchanger 8, wherein the economizer media flow is firstly conducted from the second expansion element 7 to the heat exchanger 8 and then to a housing opening 13 of the scroll machine 2, which will be described in detail later.

[0051] A solenoid valve 6 can be provided to open or close the economizer circuit E.

[0052] In the heat exchanger 8, the economizer medium flow is used to subcool the refrigeration circuit medium flow.

[0053] Based on the Figures 2 to 7Below are two preferred embodiments of the Figure 1 described scroll machine 2 shown.

[0054] Figure 2 is a highly simplified sectional view of the scroll machine 2 according to Figure 1 The scroll machine 2 has a machine housing 10, designated as a whole, which is oriented along a longitudinal axis X. The machine housing 10 can have several housing sections, wherein in the present exemplary embodiment, the machine housing 10 has a first housing section 10' and a second housing section 10''.

[0055] In the machine housing 10, a first spiral unit 100, a second spiral unit 200, an intermediate floor 50 and a high-pressure chamber 30 are arranged along the longitudinal axis X.

[0056] The first spiral unit 100 is coupled via an eccentric bearing 150 to a drive shaft 420 driven by a drive 400, wherein the drive shaft 420 is supported on the machine housing 10 via a main bearing 350 and a secondary bearing 450. The rotational axis of the drive shaft 420 defines the longitudinal axis X in the illustrated embodiment.

[0057] The first spiral unit 100 according to Figure 3 has a first side 101 and a second side 102 opposite the first side 101 in the longitudinal axis. The eccentric bearing 150 is coupled to the first spiral unit 100 on the first side 101, and a first spiral rib 110 is arranged on the second side 102, which protrudes along the longitudinal axis X and forms a first spiral channel 120.

[0058] In particular, the Figure 3It can be seen that the first spiral rib 110 on the second side 102 of the first spiral unit 100 forms the spiral channel 120 with a spiral channel bottom 130. On the end face, the spiral rib 110 also has a first spiral rib tip 180, which can either have a seal or be designed as a flat tip. Furthermore, the first spiral channel 120 can have an inner end section 125 and / or an outer end section 126.

[0059] The first spiral rib 110 is involute-shaped and extends from the inner end portion 125 to the outer end portion 126. The inner end portion 125 is located radially inward relative to the longitudinal axis X, and the outer end portion 126 is located radially outward relative to the longitudinal axis X. The at least one spiral channel 120 is U-shaped and is delimited in the radial directions by the spiral rib 110 or a spiral rib wall 140 of the spiral rib 110 and the spiral channel bottom 130.

[0060] The second spiral unit 200 can be stationary and has a first side 201 and a second side 202 opposite the first side 201 in the longitudinal axis X. A second spiral rib 210 protrudes from the first side 201 in the longitudinal axis X, wherein the second spiral rib 210 forms a second spiral channel 220.

[0061] At its end, the second spiral rib 210 further has a second spiral rib tip 280, which can either have a seal or be formed as a flat tip. Furthermore, the second spiral channel 220 can have an inner end portion 215 and / or an outer end portion 216.

[0062] The second spiral rib 210 is adapted to the first spiral rib 110 and is also involute-shaped and extends from the inner end portion 215 to an outer end portion 216. The inner end portion 215 is located radially inward relative to the longitudinal axis X, and the outer end portion 216 is located radially outward relative to the longitudinal axis X. The at least one second spiral channel 220 is U-shaped and is delimited in the radial directions by the second spiral rib 210 or a spiral rib wall 240 of the second spiral rib 210 and the second spiral channel base 230.

[0063] As in Figure 2As shown, the first spiral rib 110 of the first spiral unit 100 and the second spiral rib 210 of the second spiral unit 200 mesh with each other. The first spiral unit 100 can be moved by the drive 400 along an orbital path (not shown) relative to the second spiral unit 200. A guide device (not shown) prevents the first spiral unit 100 from rotating about the longitudinal axis X during movement along the orbital path.

[0064] During the intermeshing or meshing, the first spiral rib 110 engages the second spiral channel 220 and the second spiral rib 210 engages the first spiral channel 120. The second spiral rib tip 280 of the second spiral rib 210 cooperates in a sealing manner with the spiral channel bottom 130 of the first spiral unit 100 and the first spiral rib tip 180 of the first spiral rib 110 cooperates with the spiral channel bottom 230 of the second spiral unit 200.

[0065] During a movement of the first spiral unit 100 along the orbital path, pressure chambers (not shown) are enclosed between the first spiral unit 100 and the second spiral unit 200, which are displaced depending on the outer end section 126, 226 to the inner end section 125, 225 and vice versa.

[0066] In the event that the scroll machine 2 operates as a scroll compressor or scroll compressor, the enclosed pressure chambers are displaced from the outer end portion 126, 226 to the inner end portion 125, 225, wherein the pressure chambers experience a continuous volume reduction.

[0067] In a scroll expander, the pressure chambers experience a continuous increase in volume and the pressure chambers are displaced from the inner end section 125, 225 to the outer end section 126, 226.

[0068] The high-pressure chamber 30 and the intermediate floor 50 are arranged on the second side 202 of the second spiral unit 200, with the intermediate floor 50 being arranged along the longitudinal axis X between the high-pressure chamber 30 and the second spiral unit 200. The intermediate floor 50 decouples the second spiral unit from the pressure forces in the high-pressure chamber 30 and is supported relative to the machine housing 10.

[0069] The high-pressure chamber 30 is connected to the second spiral channel 220 via a passage 260, wherein the passage 260 includes an outlet opening 262 arranged in the region of the inner section 215. The outlet opening 262, also called a "discharge port," is preferably formed in the inner end section 225 of the second spiral channel base 230, and the passage 260 extends along the longitudinal axis X through an opening 52 through the intermediate base 50 to the high-pressure chamber 30.

[0070] The high pressure chamber 30 is in turn connected to the outlet 12 and the medium can leave the scroll machine through the outlet 12.

[0071] The high-pressure chamber 30 is surrounded or enclosed by the machine housing 10 and the intermediate floor 50. For this purpose, the machine housing 10 or the second housing section 10'' can be pot-shaped with a recess, wherein the intermediate floor 50 can close the high-pressure chamber 30 in the machine housing 10 or the second housing section 10'' like a lid or plug. For this purpose, the shapes of the recess of the second housing section 10" and the intermediate floor 50 are adapted to one another, wherein preferably both the recess and the intermediate floor 50 have a circular-cylindrical shape and can be designed to fit one another precisely.

[0072] In order to avoid leakage between the intermediate floor 50 and the machine housing 10, first sealing means 56 can be provided.

[0073] The intermediate base 50 has a first side and a second side, the first side facing the second spiral unit 200, and the second side facing the high-pressure chamber 30. The intermediate base 50 comprises the opening 52, which is part of the passage, and an annular projection 55, which protrudes on the first side of the intermediate base 50 along the longitudinal axis X from the first side of the intermediate base 50 in the direction of the second spiral unit 200. The annular projection 55 can have a radial groove on the free end face. Furthermore, the edges of the annular projection 55 can have chamfers, which can particularly simplify assembly of the second spiral unit 200.

[0074] On the first side of the intermediate base 50, an axial securing means 58 in the form of a securing ring fastened in the machine housing 10 can be arranged, by which the position of the intermediate base 50 in the longitudinal axis X is determined. The axial securing means 58 supports the intermediate base 50 on the side facing the second spiral unit 200 on the machine housing 10, whereby the pressure forces from the high-pressure chamber 30 are substantially decoupled from the second spiral unit 200 and coupled into the machine housing 10.

[0075] The second spiral unit 200 encompasses the annular projection 55 of the intermediate base 50 and, for this purpose, has a first annular projection 251 and a second annular projection 252 on the second side 202, wherein the first annular projection 251 cooperates with an inner circumferential surface of the annular projection 55 and the second annular projection 252 cooperates with an outer circumferential surface of the annular projection 55 of the intermediate base 50.

[0076] The annular projections 55 of the intermediate base 50 and the annular projections 251, 252 of the second spiral unit are arranged telescopically and can form a radial bearing for the second spiral unit 200, which can enable an axial displacement of the second spiral unit 200 relative to the intermediate base 50, whereby, for example, manufacturing tolerances can be compensated.

[0077] For injecting the medium, the scroll machine 2 has a line 70 which connects a housing opening 13 - also called economizer inlet - with an injection opening 270 in the second spiral channel 220 of the second spiral unit 200.

[0078] The injection opening 270 is with reference to the Figures 4 and 6 arranged in the second spiral channel 220 between the inner end section 215 and the outer end section 216, wherein the injection opening 270 can be arranged shifted from a center between the inner end section 215 and the outer end section 216 to the inner end section 215 or the outer end section 216 depending on the design of the refrigeration system 1 or the scroll machine 2.

[0079] The line 70 is guided from the housing opening 13 to the injection opening 270 through the scroll machine 2 in such a way that the line 70 is guided past the high-pressure chamber 30 and not through the high-pressure chamber 30.

[0080] For this purpose, line 70, as shown in Figure 2 shown, is guided past the high-pressure chamber 30 from the machine housing 10 through the intermediate floor 50 and then through the second spiral unit 200 to the injection opening 270.

[0081] The line 70 has a housing line section 74 in the machine housing 10, which, according to the enlarged illustration in Figure 3 or 4 is radially oriented and connects the housing opening 13 with an inner circumferential surface of the machine housing 10 or the second housing section 10''.

[0082] Furthermore, the line 70 in the intermediate floor 50 has a first line section 71 and a second line section 72. The first line section 71 and the second line section 72 are arranged in an L-shape, wherein the first line section 71 is preferably designed to be substantially radially oriented and the second line section 72 is designed to be substantially axially oriented. The first line section 71 and the second line section 72 can be formed, for example, by blind holes that intersect at a common intersection point.

[0083] With reference to Figure 4It is evident that the intermediate floor 50 should be positioned in the machine housing 10 such that fluid communication can take place between the first line section 71 and the housing line section 74. Preferably, the housing line section 74 opens—preferably directly—into the first line section 71, with the housing line section 74 and the first line section 71 even more preferably being aligned. To prevent leakage from or into the line 70, the previously described first sealing means 56 can be arranged on both sides of the line 70 along the longitudinal axis.

[0084] The second line section 72 can preferably be guided centrally through the annular projection 55 and opens into a second intermediate space 62 formed between the intermediate base 50 and the second spiral unit 200. According to the preferred and illustrated exemplary embodiment, the second intermediate space 62 is enclosed by the annular projections 251, 252, wherein a second sealing means 57 can be arranged between the annular projection 55 of the intermediate base and the annular projections 251, 252, i.e., radially inside and outside. The intermediate space 62 surrounds the passage 260.

[0085] From the second intermediate space 62, the medium can flow from the second side 202 to the first side 201 of the second spiral unit 200 through an opening 275 to the injection opening 270 in the second spiral channel 220. The opening 275 is preferably axially oriented and can also be designed as a stepped opening 275 whose cross section tapers from a first section 276 to a second section 277, starting from the second side 202 to the first side 201.

[0086] The aperture 275 can be designed as a bore. To form the stepped configuration, either the aperture 275 can be designed in a stepped manner, or a nozzle with the desired shape can be inserted into the aperture 275. In principle, it is also possible to provide a plurality of apertures 275 or injection openings 270 instead of a single aperture 275 or a single injection opening 270. Furthermore, the aperture 275 and / or the injection opening 270 can also be designed as a slot. o. Ä. be trained.

[0087] In particular, the enlarged representation according to Figure 3It can be seen that the injection opening 270 comprises a recess 242 in the second spiral rib 210 or in the spiral rib wall 240. The recess 242 can be designed in the manner of a circular groove and extends in the second spiral rib wall 240 from the spiral channel base 230 in the direction of the second spiral rib tip 280, wherein it can be seen that the recess 242 does not extend to the second spiral rib tip 280, but is only formed over approximately 10% of the channel height of the second spiral channel 220.

[0088] Furthermore, Figure 3It can be seen that the injection opening 270 extends over a transition region 235 between the second spiral channel base 230 and the second spiral rib 210 and has a first opening section 271 in the second spiral channel base 230 and a second opening section 272 in the second spiral rib 210, which is formed by the recess 242 in the spiral rib 210. The injection opening 270 can thus be positioned such that, in particular, a seal on the first spiral rib tip 180 of the first spiral unit 100 is not guided over the injection opening 270 during the orbital movement. This can prevent damage to both the injection opening 270 and the seal on the first spiral rib tip 180.

[0089] The Figures 5 and 6show a second preferred and exemplary embodiment of the scroll machine 2, wherein the two embodiments differ in the design of the line 70.

[0090] In particular with reference to Figure 6 It can be seen that the line 70 in the intermediate floor 50 is formed by a plurality of first line sections 71 and second line sections 72 distributed in pairs over the circumference and connected in parallel, wherein these are preferably distributed evenly over the circumference.

[0091] In the illustrated embodiment, the line 70 is formed by four first line sections 71 and second line sections 72 connected in parallel and distributed circumferentially around the longitudinal axis X, wherein the first line section 71 is in fluid communication with the housing line section 74 via a first intermediate space 61. The number of lines 70 and / or the parallel-connected first line sections 71 and / or second line sections 72 can be selected at the discretion of the person skilled in the art.

[0092] The first intermediate space 61 is formed between the machine housing 10 and the intermediate floor 50. In the illustrated and preferred embodiment, the first intermediate space 61 is formed by a radial groove in an outer surface of the intermediate floor 50. The first intermediate space 61 is formed over the entire circumference of the intermediate floor 50 and distributes the medium coming from the housing line section 74 over the circumference to the first line sections 71.

[0093] Due to the first intermediate space 61, the alignment of the intermediate floor 50 does not have to be taken into account when inserting the intermediate floor 50 into the recess of the machine housing 10 and, on the other hand, the medium is distributed over the circumference in the intermediate floor 50, whereby a symmetrical thermal load can be achieved by the medium in the intermediate floor.

[0094] A further development of the present invention (not shown) provides that the line 70, in particular the line 70 in the intermediate floor 50, is thermally insulated. The thermal insulation can prevent a significant heat input into the medium to be injected before it enters the spiral channel 220. The thermal insulation can be arranged, for example, on the side of the intermediate floor 50 facing the high-pressure chamber 30 or directly around the line 70.

[0095] The medium can pass from the high-pressure chamber 30 to the outlet 12 via a pressure nozzle 40, wherein the pressure nozzle 40 is preferably arranged in such a way that the medium cannot flow directly from the passage 260 into the pressure nozzle 40. The pressure nozzle 40 according to the enlarged illustration in Figure 3 protrudes from the side of the machine housing 10 facing the intermediate floor 50 in the direction of the intermediate floor 50 and is according to the Figure 7 arranged in a plane perpendicular to the longitudinal axis X offset from the passage 260.

[0096] In order to achieve a particularly effective reduction of pressure fluctuations in the high-pressure chamber 30, a return flow area 45 can be provided, which forces an S-shaped flow path from the passage 260 through the pressure nozzle 40 to the outlet 12, which in Figure 3 indicated by a dotted arrow line.

[0097] The return flow area 45 can have a preferably annular recess 59 on the second side of the intermediate base 50, which faces the high-pressure chamber 30, which, together with the pressure connection, defines the S-shaped flow path. For this purpose, the pressure connection 40 is connected to the intermediate base 50 according to the Figure 7in a contact area 46 in operative contact, wherein the contact area 46 is arranged on an imaginary connecting line in a plane perpendicular to the longitudinal axis X between the pressure nozzle 40 and the passage 260. As a result, the medium coming from the passage 260 must first undergo a deflection in order to enter the recess 59 and from there pass through the pressure nozzle 40 to the outlet 12.

[0098] Between the high pressure chamber 30 and the outlet 12, a Figures 2 , 3 and 5 shown check valve 48 may be arranged, which preferably comprises a bushing that can be inserted into the pressure port 40. List of reference symbols

[0099] 1 Refrigeration system 2 Scroll machine 3 Condenser 4 First expansion element 5 Evaporator 6 Solenoid valve 7 Second expansion element 8 Heat exchanger 10 Machine housing 10' First housing section 10'' Second housing section 10 Machine housing 11 Inlet 12 Outlet 13 Housing opening 30 High-pressure chamber 30 High-pressure chamber 40 Pressure nozzle 45 Return flow area 46 Contact area 48 Check valve 49 Bushing 50 Intermediate base 52 Opening 55 Projection 56 First sealant 57 Second sealant 58 Axial lock 59 Recess 61 First space 62 Second space 70 Line 71 First line section 72 Second line section 74 Housing line section 100 First spiral unit 101 First side 102second side 110first spiral rib 120first spiral channel 125inner end section 126outer end section 130first spiral channel base 150eccentric bearing 180first spiral rib tip 200second spiral unit 201first side 202second side 210second spiral rib 220second spiral channel 225inner end section 226outerEnd section 230Second spiral rib 230Channel base 235Transition area 240Second spiral rib wall 242Recess 251Protrusion 252Protrusion 260Passage 262Outlet opening 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 spiral rib tip 300 Main bearing housing 350 Main bearing 400 Drive 420 Drive shaft 450 Secondary bearing EEconomizer circuit MRefrigerant circuit XLongitudinal axis

Claims

1. Scrolling machine (2) with an injection for a medium, comprising a machine housing (10) with a longitudinal axis (X), wherein in the machine housing (10) along the longitudinal axis (X) a first spiral unit (100) with a spiral channel (120) formed by a first spiral rib (110), a second spiral unit (200) with a first side (201) and a second side (202) opposite the first side (201), wherein a spiral channel (220) formed by a second spiral 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 spiral unit (200) and is connected to the spiral channel (220) via a passage (260) in the second spiral unit (200), are provided wherein the first spiral unit (100) and the second spiral unit (200) engage to form pressure chambers, wherein the first spiral unit (100) can be moved relative to the second spiral unit (200) along an orbital path, wherein an intermediate base (50) is provided in the machine housing (10) along the longitudinal axis (X) between the second spiral unit (200) and the high pressure chamber (30), wherein a line (70) is provided for the injection of the medium, which connects a housing opening (13) to an injection opening (270) in the spiral channel (220) of the second spiral unit (200), and wherein the line (70) is guided from the housing opening (13) past the high-pressure chamber (30) through the intermediate base (50), characterized in that the intermediate base (50) encloses the high-pressure chamber (30) together with the machine housing (10), and wherein the intermediate base (50) is supported on the machine housing (10) by an axial securing means (58) or a shoulder on the machine housing (10) on the side facing the second scroll unit (200).

2. Scrolling machine (2) according to claim 1, characterized in that the line (70) has a first intermediate space (61), wherein the first intermediate space (61) is arranged between the intermediate base (50) and the machine housing (10).

3. Scrolling machine (2) according to claim 2, characterized in that the first intermediate space (61) is formed by a, preferably circumferential, radial groove in a cylindrical surface of the intermediate base (50) and / or a cylindrical surface of the machine housing (10).

4. Scrolling machine (2) according to any one of the preceding claims, characterized in that the line (70) in the intermediate base (50) comprises a first line section (71) and a second line section (72), and in that the first line section (71) and the second line section (72) are arranged in an L-shape.

5. Scrolling machine (2) according to claim 4, 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.

6. Scrolling machine (2) according to any one of the preceding claims, characterized in that the line (70) in the intermediate base (50) comprises at least two lines (70) connected in parallel.

7. Scrolling machine (2) according to any one of the preceding claims, characterized in that the second scroll unit (200) is supported axially movably on the intermediate base (50).

8. Scrolling machine (2) according to any one of the preceding claims, characterized in that the line (70) comprises a second intermediate space (62), wherein the second intermediate space (62) is arranged, preferably along the longitudinal axis (X), between the intermediate base (50) and the second spiral unit (200).

9. The scrolling machine (2) according to claim 8, characterized in that the second intermediate space (62) is annular.

10. Scrolling machine (2) according to claim 8 or 9, characterized in that the second intermediate space (62) is formed by annular projections (55, 251, 252) arranged telescopically along the longitudinal axis (X).

11. Scrolling machine (2) according to claim 8 or 9 or 10, characterized in that the second intermediate space (62) is sealed by sealing means (57) on the annular projections (55, 251, 252).

12. Scrolling machine (2) according to any one of the preceding claims, characterized in that the injection opening (270) comprises a recess (242) in the spiral rib (210).

13. Scrolling machine (2) according to any one of the preceding claims, characterized in that the injection opening (270) is arranged in a spiral channel base (230).

14. Scrolling machine (2) according to claim 13, characterized in that the injection opening (270) extends over a transition region (235) between the spiral channel base (230) and the spiral rib (210) and comprises a first opening section (271) in the spiral channel base (230) and a second opening section (272), which is formed by the recess (242) in the spiral rib (210).

15. Scrolling machine (2) according to any one of the preceding claims, characterized in that the injection opening (270) is formed by a stepped aperture connecting the first side (201) to the opposite second side (202) of the second scroll unit (200).

16. Scrolling machine (2) according to any one of the preceding claims, characterized in that the conduit (70) and / or the injection opening comprises a non-return valve (48).

17. Scrolling machine (2) according to any one of the preceding claims, characterized in that the line (70) is insulated, and / or in that the side of the intermediate base (50) facing the high-pressure chamber (30) has thermal insulation.

18. Scrolling machine (2) according to any one of the preceding claims, characterized in that the second scroll unit (200) is stationary.

19. Scrolling machine (2) according to any one of the preceding claims, 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).

20. Scrolling machine (2) according to any one of the preceding claims, characterized in that the high pressure chamber (30) is connected to an outlet (12) via a pressure connection piece (40), wherein the pressure connection piece (40) is arranged offset to the passage (260) in a plane transverse to the longitudinal axis (X).

21. Scrolling machine (2) according to claim 20, characterized in that a backflow region (45) is provided, which forces an S-shaped flow path from the passage (260) through the discharge nozzle (40) to the outlet (12).

22. Scrolling machine (2) according to claim 21, characterized in that the backflow region (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 piece (40) projecting towards the recess (59).

23. Scrolling machine (2) according to any one of claims 20 to 22, characterized in that the pressure nozzle (40) is in operative contact with the intermediate base (50) in a contact region (46) for forming the backflow region (45), and in that the contact region (46) is arranged on an imaginary connecting line in a plane perpendicular to the longitudinal axis (X) between the pressure nozzle (40) and the passage (260).

24. Scrolling machine (2) according to claim 20 to 23, characterized in that the pressure connection piece (40) comprises a bushing (49) with a non-return valve.

25. Refrigeration system (1), comprising a scrolling machine (2) according to any one of the preceding claims.

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