Scroll machine and refrigeration system

Abstract

Scroll machine (2), in particular spiral compressor, comprising a first spiral unit (100) with a base (130) and a spiral rib (110) projecting from the base (130) with a spiral rib tip (160), a second spiral unit (200) with a base (230) and a spiral rib (210) projecting from the base (230) with a spiral rib tip (260), wherein the first spiral unit (100) can be moved along an orbital path relative to the second spiral unit (200) and the first spiral unit (100) and the second spiral unit (200) interlock to form pressure chambers, the spiral rib (110) of a spiral rib tip (110, 210) having an end seal (170) bearing in sealing contact with the base (130, 230) of the respective other spiral unit (100, 200), wherein the base (130) of the first spiral unit (100) and / or the base (230) of the second spiral unit (200) a pocket (132, 232) with an insert plate (136) arranged in the pocket (132, 232),236) include or includes a refrigeration system with such a scroll machine (2).

Description

[0001] The present invention relates to a scrolling machine with an injection system for a medium, in particular a refrigerant, and to a refrigeration system with such a scrolling machine.

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

[0003] Known scroll machines typically feature two cooperating spiral units, each with at least one spiral rib forming at least one spiral channel. The spiral ribs of the spiral units interlock to form pressure chambers, with the spiral ribs sealingly abutting the base of the other spiral unit.

[0004] Both the spiral channel and the spiral rib forming the spiral channel are shaped like a circular involute, with the two spiral units being movable relative to each other. A common design of scroll machines features a stationary spiral unit and a movable spiral unit, the first movable spiral unit being able to move along an orbital path relative to a second spiral unit.

[0005] In a compressor, a medium, such as a refrigerant, is compressed according to the displacement principle by the relative movement of two spiral units. During this relative movement, the medium is moved along the spiral channels in pressure chambers from an outer end to an inner end, undergoing a change in volume within each pressure chamber.

[0006] In an expander, the medium, in particular a refrigerant, is expanded by a relative movement of the two spiral units. During this relative movement, the medium is displaced in pressure chambers along the spiral channels from an inner end region to an outer end region, whereby the medium experiences an increase in volume in the respective pressure chamber.

[0007] WO 2018 019 372 A1 discloses, for example, such a generic 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 like air or cooling components or equipment.

[0008] Further state of the art is represented by DE 690 02 885 T2, DE 697 00 233 T2, JP H03 88 983 A and JP H07 269 472 A.

[0009] The scroll machines and refrigeration systems described above have proven their worth in the past. The spiral units are subjected to high mechanical loads and pressure forces. The cyclic mechanical stresses on the interacting spiral ribs negatively impact the intended service life of the scroll machine and necessitate a robust, and therefore heavy, construction. Sealing the pressure chamber also presents challenges, as the contact surfaces of the spiral units are subject to wear.

[0010] This is where the present invention comes in.

[0011] The object of the present invention is to propose a scrolling machine and a refrigeration system of the type described above, which appropriately eliminates the disadvantages known from the prior art.

[0012] These tasks are solved by a scrolling machine with the features of claim 1 and by a refrigeration system with the features of claim 17.

[0013] Further advantageous embodiments of the invention are specified in the dependent claims.

[0014] The scroll machine according to the invention, in particular a spiral compressor, for a medium, comprising the features of claim 1, has a first spiral unit and a second spiral unit arranged along a longitudinal axis. The first spiral unit comprises a base and a spiral rib projecting from the base, the spiral rib having a spiral rib tip. The second spiral unit comprises a base and a spiral rib projecting from the base, the spiral rib having a spiral rib tip. The first spiral unit can be moved along an orbital path relative to the second spiral unit, and the first spiral unit and the second spiral unit interlock to form pressure chambers, the spiral rib tip sealingly interacting with the base of the respective other spiral unit. According to the invention, the base of the first spiral unit and / or the base of the second spiral unit comprises a pocket with an insert plate arranged in the pocket.includes.

[0015] It should be noted at this point that the medium in the sense of the present invention is preferably a refrigerant, wherein the refrigerant comprises a lubricant which can be carried along by the refrigerant.

[0016] According to the present invention, an insert plate is inserted into the base of the first spiral unit and / or into the base of the second spiral unit, which has a sealing surface that interacts with the respective spiral rib tip and is traversed by the respective spiral rib tip during a complete movement of the first spiral unit along its orbital path. The shape and size of the insert plate correspond to the shape and size of the pocket.

[0017] The first spiral unit and / or the second spiral unit can be made of aluminum or an aluminum alloy, while the insert plate can be made of a harder material such as metal, stainless steel, or the like. This results in less wear on the base of each spiral unit, and the insert plate can be replaced if necessary.

[0018] Preferably, the respective spiral rib tip of the first spiral unit and / or the second spiral unit is designed, for example by means of an end seal described later, such that the respective spiral rib tip interacts sealingly exclusively within the sealing surface of the insert plate during a complete movement of the first spiral unit along the orbital path.

[0019] According to a further development of the present invention, the insert plate is loosely inserted into the pocket. The insert plate is thus held in the pocket solely by a form-fit connection. Lubricant carried along with the medium can accumulate between the pocket and the insert plate, which on the one hand prevents wear between the insert plate and the pocket and on the other hand lubricates the sealing surface of the insert plate, thereby achieving an improved sealing effect between the respective spiral rib tip and the insert plate.

[0020] Furthermore, it has proven advantageous if the pocket has a pocket depth and the insert sheet has a sheet thickness, and the sheet thickness is greater than the pocket depth.

[0021] The insert plate protrudes from the pocket. Furthermore, this measure ensures that the end face of one spiral unit cannot collide with the base of another spiral unit.

[0022] The respective pocket should preferably be provided with the smallest possible corner radius to minimize play between the insert plate and the pocket. This, and / or the selection of suitable tolerances, should minimize the movement of the insert plate within the pocket and prevent damage to the spiral rib by the insert plate.

[0023] According to the invention, the pocket is arranged at a distance from the respective spiral rib. The distance between the spiral rib and the pocket of the first spiral unit and / or the second spiral unit is measured transversely to a spiral channel formed by the spiral rib. The distance between the pocket and the spiral rib reduces the notch effect of the pocket.

[0024] Furthermore, it has proven advantageous to provide a transition rounding between the base and the spiral rib of the spiral unit. The transition rounding preferably has a radius and reduces the notch effect in the area between the base and the spiral rib.

[0025] According to further training, to further reduce the notch effect, the distance between the pocket and the spiral rib can approximately correspond to the radius of the transition rounding between the base and the spiral rib.

[0026] A further development of the invention may also provide that the insert plate has at least one lubrication groove. This at least one lubrication groove connects the sealing surface with a rear side of the insert plate located on the opposite side and allows the lubricant carried along with the medium to penetrate into the pocket between the spiral unit and the insert plate. It is also preferred that the at least one lubrication groove is arranged on an outer edge of the insert plate in the radial direction and is formed in the direction of the longitudinal axis in the manner of a circular groove.

[0027] According to a further development of the present invention, the second spiral unit has at least one injection port for the medium from an economizer circuit. Through this injection port, the medium from the economizer circuit can be injected into a closed pressure chamber, thereby increasing the operating limits and efficiency of the scroll machine.

[0028] Furthermore, according to a further development of the present invention, the injection opening can be provided with a recess in the spiral rib. The recess is preferably designed as a circular groove in a spiral wall of the spiral rib. The recess can also extend from the base of the second spiral unit in the spiral wall of the spiral rib towards the tip of the spiral rib over preferably more than 5% of the height of the spiral rib and preferably not over 50% of the height, and even more preferably not over 25% of the height of the spiral rib.

[0029] Furthermore, it has proven advantageous if the injection opening is located, at least in some areas, in the base - preferably adjacent to the pocket.

[0030] A preferred embodiment of the present invention provides that the injection port has a first opening section arranged in the transition radius and a second opening section formed by the recess in the spiral rib of the second spiral unit. By arranging the injection port in this way in the transition region between the base and the spiral rib of the second spiral unit, it is possible to prevent the spiral rib tip of the spiral rib of the first spiral unit or an end seal of the first spiral rib from passing over or coming into contact with the injection port. Such contact could damage both the injection port and / or the first spiral rib tip.

[0031] It has also proven advantageous if the supply line to the injection port in the second spiral unit is stepped, tapering towards the injection port. Alternatively, the supply line can also be conical. Preferably, the supply line can be designed as a bore with a circular cross-section. However, it is equally possible to design the supply line with a crescent-shaped cross-section or as an elongated hole.

[0032] According to a further development of the present invention, the spiral rib tip of the first spiral unit and / or the spiral rib tip of the second spiral unit can comprise an end seal. The end seal rests sealingly against the base of the other spiral unit, preferably being in operative contact with the base of the other spiral unit.

[0033] The end seal in connection with the present invention can, in the simplest case, be formed by a flat spiral rib tip that abuts the base of the respective other spiral unit in a sealing manner. The end seal can have a special shape or a material composition different from that of the spiral rib, or similar features, or it can comprise a sealing element arranged at the spiral rib tip. Such sealing elements can be, for example, made of metal or plastic.

[0034] According to a further development of the present invention, the end seal comprises a groove.

[0035] Furthermore, according to a preferred embodiment, the end seal can comprise a sealing element arranged in the groove in the spiral rib tip. According to a further preferred embodiment of the present invention, the sealing element projects out of the groove in the spiral rib tip in the longitudinal direction.

[0036] Preferably, the insert plate has a sealing surface that interacts with the end seal, in particular with the sealing body, wherein the sealing surface is dimensioned such that, during a complete movement of the first spiral unit along the orbital path, the end seal or the sealing body passes over the respective insert plate exclusively within the sealing surface. For this purpose, the sealing surface can be dimensioned larger than the area traversed by the end seal or the sealing body, thereby ensuring that the end seal or the sealing body comes into contact exclusively with the sealing surface of the insert plate and not with an outer edge of the insert plate, which would lead to damage to the end seal or the sealing body and / or wear on the insert plate in the long term.

[0037] Preferably, the sealing body is loosely inserted into the groove, allowing lubricant carried by the medium to penetrate into the groove between the sealing body and the groove. Furthermore, the medium can penetrate between the sealing body and the groove and, through pressure forces, create an additional sealing effect of the end seal.

[0038] Furthermore, it has proven advantageous if the end seal is arranged between the two spiral walls at the spiral rib tip of the respective spiral rib. Preferably, the end seal or sealing body is arranged at a distance from the spiral wall, the distance being measured along a normal vector from the spiral wall. The distance between each of the two opposing spiral walls of the spiral rib and the end seal is preferably the same.

[0039] Furthermore, it has proven advantageous if the wall clearance between the insert plate and the spiral wall is smaller than the clearance between the spiral wall and the sealing body. This ensures that the end seal travels exclusively over the sealing surface of the insert plate and not beyond it.

[0040] A preferred embodiment of the present invention provides that the scroll machine, in particular a spiral compressor, comprises a first spiral unit and a second spiral unit arranged along a longitudinal axis. The first spiral unit comprises a base and a spiral rib projecting from the base, the rib having a spiral tip. The second spiral unit comprises a base and a spiral rib projecting from the base, the rib having a spiral tip. The first spiral unit can be moved along an orbital path relative to the second spiral unit, and the first and second spiral units interlock to form pressure chambers, with the spiral rib tip sealingly interacting with the base of the other spiral unit.Each spiral rib extends from an inner end section to an outer end section, and at least one of the spiral rib tips of the two spiral rib tips has an end seal comprising a groove. The groove further comprises an end seal groove section and at least one outlet groove section, wherein the at least one outlet groove section is arranged between the outer end section and / or the inner end section. Preferably, the sealing element can be inserted into the end seal groove section.

[0041] The groove in the spiral rib tip thus has at least two differently shaped sections, namely the end seal groove section and the at least one outlet groove section, whereby the end seal can only be arranged in the end seal groove section. The at least two differently shaped sections differ in particular by different cross-sectional areas of the groove, preferably in the groove depth.

[0042] The outlet groove section can be designed like a squealer tip and forms a cavity on the side facing the base of the other spiral unit. This cavity allows a gap flow to form over the spiral rib tip. Additional pressure losses in the cavity can reduce the gap flow, and some of the gap flow can penetrate the groove between the groove and the sealing body into the end seal groove section, thus improving the overall sealing effect of the end seal. Specifically, in the inner end section, the medium can flow at high pressure through the outlet groove section into the end seal groove section, forcing the sealing body out of the groove against the base of the other spiral unit. This results in improved sealing performance and more uniform wear and contact pressure.Uniform pressure under the sealing body results in uniform contact with the corresponding sealing surface or insert plate, thereby reducing wear on the sealing surface.

[0043] According to a preferred embodiment of the present invention, the end-seal groove section can have a first groove depth and the at least one outlet groove section a second groove depth, wherein the first groove depth is greater than the second groove depth. The different depths allow the sealing element to be positively retained in the end-seal groove section.

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

[0045] An embodiment of the present invention and a further development thereof are described in detail below with reference to the accompanying figures. The figures show: Figure 1 is a highly simplified and schematic representation of a refrigeration system with a scroll machine according to the invention; Figure 2 is an enlarged sectional view of the scroll machine with a first spiral unit and a second spiral unit according to the invention. Figure 1 Figure 3 shows a detailed representation of the scrolling machine according to Figure 2 Figure 4 shows a perspective exploded view of the second spiral unit of the scroll machine according to Figure 2 with an insert plate and an end seal, Figure 5 a top view of the second spiral unit according to Figure 4 Figure 6 is an enlarged view of detail Z according to Figure 5, Figure 7 is a perspective view of a spiral rib of the second spiral unit with a spiral rib tip, Figure 8 is a sectional view along the section line AA according to Figure 7 Figure 9 shows a sectional view along the section line BB according to Figure 7 Figure 10 shows a sectional view along the section line CC according to Figure 7 , and Figure 11 shows a further development of the scroll machine, wherein the first spiral unit of the scroll machine has an insert plate.

[0046] Identical or functionally equivalent parts or features are identified by the same reference numerals in the detailed description of the figures below. Furthermore, not all identical or functionally equivalent parts or features in the figures are assigned a reference number.

[0047] Figure 1 Figure 1 shows a preferred embodiment of a refrigeration system 1 with a scroll compressor 2. The refrigeration system 1 comprises the scroll compressor 2, designed as a spiral compressor, a condenser 3, an expansion element 4, and an evaporator. 5.A medium, preferably a refrigerant, flows through the refrigeration system 1 along the direction indicated by arrows, first from an outlet 12 of the scroll machine 2 in the sequence to the condenser 3, the expansion element 4, the evaporator 5 and finally back through an inlet 11 into the scroll machine 2.

[0048] Figure 1 A simplified sectional view of the scroll machine 2 can be seen. The scroll machine 2 has a machine housing 10, referred to as a whole, which is oriented along a longitudinal axis X. The machine housing 10 can have several housing parts, wherein in the present embodiment the machine housing 10 has a first housing part 10' and a second housing part 10".

[0049] In the machine housing 10, along the longitudinal axis X, according to Figure 1From right to left the inlet 11, a drive unit 400, a drive shaft 420 with a first bearing unit 450 and a second bearing unit 300, a first spiral unit 100, a second spiral unit 200, an intermediate floor 50, a high-pressure chamber 30 and the outlet 12 are arranged.

[0050] The first spiral unit 100 is coupled to the drive unit 400 via an eccentric drive 150 and the drive shaft 420.

[0051] The drive shaft 420 is aligned along the longitudinal axis X, and in the illustrated embodiment, the axis of rotation of the drive shaft 420 defines the longitudinal axis X. The drive shaft 420 has a first end section and a second end section on opposite sides along the longitudinal axis X.

[0052] The first spiral unit 100 according to Figure 2The device has a first side 101 and a second side 102 opposite the first side 101 along the longitudinal axis X. On the first side 101, the first spiral unit 100 is mounted on the second bearing unit 300 by means of the axial bearing 190. The eccentric drive 150 is coupled to the first spiral unit 100 on the first side 101, and on the second side 102, a spiral rib 110 is arranged, which projects along the longitudinal axis X and forms a first spiral channel 120.

[0053] The spiral rib 110 comprises spiral walls 140 and a spiral rib tip 160.

[0054] A transition rounding 135 can be provided between the spiral rib 110 and the base 130 (see Fig. 11 ) be provided. The transition rounding 135 may preferably have a radius R and serves to reduce the notch effect in a transition area between the spiral rib 110 and the base 130.

[0055] Furthermore, several ring-pin couplings (not shown) can be provided, which prevent a complete rotation of the first spiral unit 100 about the longitudinal axis X. The ring-pin coupling couples the first spiral unit 100 to the second bearing unit 300.

[0056] Furthermore, the Figure 2 It can be deduced that the first spiral rib 110 on the second side 102 of the first spiral unit 100 forms the spiral channel 120. At its end face, the spiral rib 110 has the spiral rib tip 160, which can either have an end seal 170, as shown, or be designed as a flat tip. The first spiral channel 120 extends from an inner end region 125 to an outer end region 126.

[0057] The spiral rib 110 is involute in shape along a spiral skeletal line and extends from an inner end section 115 to the outer end section 116. The inner end section 115 is located radially inside with respect to the longitudinal axis X, and the outer end section 116 is located radially outside with respect to the longitudinal axis X. The at least one spiral channel 120 is U-shaped and is bounded in the radial directions by the spiral rib 110 or the spiral walls 140 of the spiral rib 110 and the base 130.

[0058] In the illustrated embodiment, the first spiral unit 100 has an end seal 170 which extends from the spiral rib tip 160 in the direction of the second spiral unit 200.

[0059] The end seal 170 comprises a groove 175 and a sealing body 172 inserted into the groove 175, which protrudes from the groove 175.

[0060] The 175 groove can be used - as in Figure 3The sealing body 172 is preferably arranged centrally between the spiral walls 140 on the spiral rib tip 160 and is positioned at a distance A from the spiral wall 140. The distance A preferably corresponds to a distance between the spiral wall 140 and the sealing body 172 or the groove 175, measured along a normal vector of the spiral wall 140.

[0061] 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. On the first side 201, a spiral rib 210 projects in the longitudinal axis X, the spiral rib 210 forming a second spiral channel 220.

[0062] The spiral rib 210 comprises spiral walls 240 and a spiral rib tip 260.

[0063] A transition fillet 235 can be provided between the spiral rib 210 and the base 230. The transition fillet 235 preferably has a radius R and serves to reduce the notch effect in a transition area between the spiral rib 210 and the base 230.

[0064] The scroll machine 2 can have an injection port for injecting the medium from an economizer circuit. For injecting the medium from an economizer circuit, the second spiral unit 200 has an injection port 250 that opens into the spiral channel 220 and is located between the inner end region 125 and the outer end region 126.

[0065] Through the injection port 250, the medium from the economizer circuit can be injected into a closed pressure chamber, thereby increasing the efficiency of the scroll machine 2.

[0066] In particular the enlarged representation according to Figure 3It can be deduced that the injection opening 250 includes a recess 242 in the spiral rib 210 or in the spiral wall 240. The recess 242 can be designed in the form of a circular groove and extends in the spiral wall 240 from the base 230 towards the spiral rib tip 260, whereby it is evident that the recess 242 does not extend to the spiral rib tip 260, but is only formed over approximately 10% of the channel height of the second spiral channel 220.

[0067] Furthermore, Figure 3It can be deduced that the injection port 250 extends onto the transition radius 235 between the base 230 and the spiral rib 210 and has a first opening section 251 in the transition radius 235 and a second opening section 252 in the spiral rib 210, which is formed by the recess 242 in the spiral rib 210. The injection port 250 can thus be positioned such that, in particular, the end seal 170 on the spiral rib tip 160 of the first spiral unit 100 is not guided over the injection port 250 during orbital movement. This prevents damage to both the injection port 250 and / or the end seal 170 of the first spiral unit 100.

[0068] At its end face, the spiral rib 210 has the spiral rib tip 260, which – as shown – can have an end seal 270. Alternatively, the spiral rib tip 260 can be designed as a flat tip. Furthermore, the second spiral channel 220 can have an inner end region 225 and / or an outer end region 226.

[0069] The spiral rib 210 of the second spiral unit 200 is adapted to the spiral rib 110 of the first spiral unit 100. The spiral rib 210 of the second spiral unit 200 is involute in shape along a spiral skeletal line and extends from an inner end section 215 to the outer end section 216. The skeletal line corresponds to a profile centerline of the spiral rib 210 and lies centrally between the two spiral walls 240. The inner end section 215 is located radially inside with respect to the longitudinal axis X, and the outer end section 216 is located radially outside with respect to the longitudinal axis X. The at least one spiral channel 220 is U-shaped and is bounded in the radial directions by the spiral rib 210 or the spiral walls 240 of the spiral rib 210 and the base 230.

[0070] In the illustrated embodiment according to Figure 2The second spiral unit 200 also has an end seal 270, which projects from the spiral rib tip 260 towards the first spiral unit 100. The end seal 270 comprises a groove 275 and a sealing body 272 inserted into the groove 275, which protrudes from the groove 275.

[0071] It is noted that the end seal 170 of the first spiral unit 100 and the end seal 270 of the second spiral unit 200 may be identical in construction. For the sake of simplicity, the following will be based on the Figures 7 to 10 which described the end seal 270 of the second spiral unit 200.

[0072] The groove 275 comprises an end sealing groove section 277, into which the sealing body 272 can preferably be loosely inserted, and at least one outlet groove section 276, 278, wherein the at least one outlet groove section 278 is arranged between the outer end section 216 and / or the inner end section 215.

[0073] In the illustrated embodiment, the groove 275 comprises two outlet groove sections 276, 278, wherein the end seal groove section 277 is arranged between the two outlet groove sections 276, 278.

[0074] The end seal groove section 277 has according to Figure 8 a first groove depth T1. The outlet groove section 278 in the outer end section 216 according to Figure 10 features a second groove depth T2. The one in Figure 8 The outlet groove section 276 in the inner end section 215, which is not shown, has a second groove depth T3. The second groove depth T2 or T3 of the outlet groove sections 276, 278 in the outer end section 216 and in the inner end section 215 can be dimensioned differently.

[0075] The first groove depth T1 of the end seal groove section 277 is greater than the second groove depth T2 of the outlet groove sections 276, 278 and between the end seal groove sections 277 and the respective outlet groove section 276, 278 is a in Figure 9 Level shown is trained.

[0076] The step limits the end seal groove section. 277 and holds the sealing body 272 in a form-fitting manner in the end sealing groove section 277.

[0077] The outlet groove section 276, 278 forms a cavity on the side of the spiral rib tip 260 facing the base 130 of the first spiral unit 100, through which a gap flow can establish itself over the spiral rib tip 260. Additional pressure losses in the cavity can, on the one hand, reduce the gap flow, and on the other hand, allow part of the gap flow to enter the groove 275 between the groove 275 and the sealing body 272 in the end seal groove section. 277penetration, which improves the overall sealing effect of the end seal 270. In particular, the medium can flow at high pressure into the inner end section 215 of the spiral rib 210 via the outlet groove section 276 into the end seal groove section and can there press the sealing body 272 out of the groove 275 against the base 130 of the first spiral unit 100, resulting in the improved sealing effect.

[0078] The spiral rib tips 160, 260 of the first spiral unit 100 and / or the second spiral unit 200 can be adjusted according to the Figures 8 and 10 have a chamfer 162, 262 that connects the spiral rib tips 160, 260 to the respective spiral wall 140, 240. The grooves 175, 275 can also have a chamfer 174, 274.

[0079] The base 230 of the second spiral unit 200 can comprise a pocket 232 and an insert plate 236, as shown in Figures 2 and 3. The pocket 232 is formed in the first side 201 of the second spiral unit 200.

[0080] The bag 232 has a pocket depth D, see Figure 3 . The Figures 4 and 5 It can be deduced that the pocket 232 extends from the inner end region 225 to the outer end regions 226 of the spiral channel 220 and extends along the spiral channel 200 over an area that is at least equal to the area that the end seal 170 or the sealing body 172 of the spiral rib 110 of the first spiral unit 100 passes over during a movement along the orbital path.

[0081] The pocket 232 is arranged at a wall distance W from the spiral rib 210 or the spiral wall 240. The wall distance W preferably corresponds to a distance between the spiral wall 240 and the pocket 232, measured along a normal vector of the spiral wall 240.

[0082] The wall distance W preferably corresponds approximately to the radius R of the transition rounding 235, which is arranged to the spiral rib 210 or the spiral wall 240.

[0083] The insert plate 236, which is adapted to the pocket 232 in shape and size, is inserted into the pocket 232. The insert plate 236 has a sheet thickness B. Furthermore, the insert plate 236 has a circumferential outer edge forming a cladding surface, which connects the two end faces of the insert plate 236.

[0084] The insert plate 236 preferably rests loosely in the pocket 232. A gap may be formed between the outer surface and the pocket 232. The gap is kept as small as possible to avoid unnecessary relative movements between the spiral unit 200 and the insert plate 236.

[0085] One end face of the insert plate 236 forms a sealing surface 238 on the side facing the first spiral unit 100. The other end face rests in the pocket 232.

[0086] The Figures 3 to 5 It can be deduced that the insert plate 236 can have several lubrication grooves 239. The lubrication grooves 239 can be formed in the outer surface in the manner of an axially oriented circular groove and connect the two end faces of the insert plate 236.

[0087] The lubrication notch 239 can be according to Figure 6The lubrication grooves 239 facilitate the penetration of lubricant carried along with the medium into the pocket 232, thus lubricating the contact surfaces between the insert plate and the pocket 232.

[0088] Furthermore, a lubrication notch 239 - as in Figure 3 shown - located immediately adjacent to the injection opening 250.

[0089] Figure 3 It can be seen that the insert plate 236 protrudes from the pocket 232 and extends beyond the first side of the second spiral unit 200. The pocket depth D is therefore smaller than the plate thickness B. Preferably, the dimensions of the pocket depth and the plate thickness B are selected such that the insert plate 236 extends slightly beyond the first side 201. This extension is preferably as small as possible to achieve high efficiency and ensure operational reliability. The plate thickness can be selected accordingly to adjust the axial play.

[0090] As in Figure 2 As shown, the spiral rib 110 of the first spiral unit 100 and the spiral rib 210 of the second spiral unit 200 interlock. The first spiral unit 100 can be moved by the drive unit 400 along an orbital path (not shown) relative to the second spiral unit 200, with the ring-pin coupling 350 preventing the first spiral unit 100 from rotating about the longitudinal axis X during movement along the orbital path.

[0091] During interlocking or interpenetration, the spiral rib 110 of the first spiral unit 100 engages in the second spiral channel of the second spiral unit 200, and the spiral rib 210 of the second spiral unit 200 engages in the first spiral channel of the first spiral unit 100. The spiral rib tip 260 or the end seal 270 of the spiral rib 210 of the second spiral unit 200 seals against the base 130 of the first spiral unit 100, and the spiral rib tip 160 or the end seal 170 of the spiral rib 110 of the first spiral unit 100 seals against the base 230 of the second spiral unit 200.

[0092] More precisely, the end seal 170, in particular the sealing body 172 of the first spiral unit 100, passes over the sealing surface 238 of the insert plate 236 of the base 230 of the second spiral unit 200 and comes to this end according to the illustration in Figure 3 in effective contact with the sealing surface 238 of the insert plate 236.

[0093] The insert plate 236 and consequently also the pocket 232 are dimensioned such that the end seal 170, in particular the sealing body 172, comes into effective contact with the base 230 of the second spiral unit 200 exclusively via the insert plate 236 within the sealing surface 238. For this purpose, the distance A between the spiral wall 140 and the end seal 170 or the sealing body 172 is greater than the wall distance W between the spiral wall 140 and the insert plate 236 or its outer edge.

[0094] The medium enters the machine housing 10 through the inlet 11 and is guided in the machine housing 10 from the inlet 11 to the outer end areas 126, 226.

[0095] In a compressor, when the first spiral unit 100 moves along its orbital path, pressure chambers (not shown) are enclosed between the first spiral unit 100 and the second spiral unit 200. These chambers transfer the medium from the outer end regions 126, 226 to the inner end regions 125, 225 of the spiral channels 120, 220. The outer end regions 126, 226 together form the intake region 320, from which the medium can be drawn into the spiral channels 120, 220. It is then transferred in closed pressure chambers (not shown) from the outer end region 126, 226 to the inner end region 125, 225, with the pressure chambers undergoing a continuous reduction in volume.

[0096] In an expander, when the first spiral unit 100 moves along the orbital path, pressure chambers (not shown) are enclosed between the first spiral unit 100 and the second spiral unit 200, which displace medium from the inner end regions 125, 225 to the outer end regions 126, 226 of the spiral channels 120, 220, with the pressure chambers experiencing a continuous increase in volume.

[0097] On the second side 202 of the second spiral unit 200 the high pressure chamber 30 and the intermediate floor 50 are arranged, wherein the intermediate floor 50 is arranged along the longitudinal axis X between the high pressure chamber 30 and the second spiral unit 200.

[0098] The second spiral unit 200 can be supported on the intermediate floor 50 via a radial bearing section.

[0099] Furthermore, a supply line 70 can be routed through the intermediate floor 50, connecting the injection opening 250 with the housing opening 13.

[0100] The intermediate floor 50 decouples the second spiral unit 200 from the pressure forces in the high-pressure chamber 30 and is supported against the machine housing 10.

[0101] The high-pressure chamber 30 is connected to the second spiral channel 220 via a passage 255, wherein the passage 255 includes an outlet opening located in the region of the inner end regions 125, 225. The outlet opening, also called the "discharge port," is preferably formed in the inner end region 225 of the base 230 of the second spiral unit 200, and the passage 255 extends along the longitudinal axis X through an opening in the intermediate base 50 to the high-pressure chamber 30.

[0102] The high-pressure chamber 30 is in turn connected to the outlet 12 and the medium can leave the scroll machine 2 through the outlet 12.

[0103] Figure 11 shows a further development of the scrolling machine 2 according to Figure 2The first spiral unit 100 also has a pocket 132 with an insert plate 136. The pocket 132 and the insert plate 136 of the first spiral unit 100 can be identical to the pocket 232 with the insert plate 236. The first spiral unit 100 preferably does not have an injection opening for the medium of the ecomizer circuit. Otherwise, the features are identical. Reference symbol list

[0104] 1 Refrigeration unit 2 Scrolling unit 3 Condenser 4 Expansion unit 5 Evaporator 10 Machine housing 10' First housing part 10" Second housing part 11 Inlet 12 Outlet 30 High-pressure chamber 50 Intermediate floor 70 Pipe 100 First spiral unit 101 First side 102 Second side 110 Spiral fin 115 Inner end section 116 Outer end section 120 Spiral channel 125 Inner end area 126 Outer end area 130 Bottom 132 Pocket 135 Transition rounding 136 Insert plate 138 Sealing surface 139 Lubrication groove 140 Spiral wall 150 Eccentric drive 160 Spiral fin tip 170 End seal 172 Sealing body 175 Groove 176 Outlet groove section 177End seal groove section 178 Outlet groove section 190 Thrust bearing 200 Second spiral unit 201 First side 202 Second side 210 Spiral rib 215 Inner end section 216 Outer end section 220 Spiral channel 225 Inner end area 226 Outer end area 230 Bottom 232 Pocket 235 Transition rounding 236 Insert plate 238 Sealing surface 239 Lubrication groove 240 Spiral wall 242 Recess 250 Injection port 251 First opening section 252 Second opening section 255 Passage 260 Spiral rib tip 270 End seal 272 Sealing body 275 Groove 276 Outlet groove section 277 End seal groove section 278 Outlet groove section 300 Second bearing unit 320 Intake area 400 Drive unit 420 Drive shaft 450 First bearing unit ASpacing DPocket depth BSheet thickness WWall spacing T1Groove depth T2Groove depth XLanterior axis

Claims

1. Scroll machine (2), in particular a scroll compressor, comprising a first scroll unit (100) having a base (130) and a scroll rib (110) projecting from the base (130) with a scroll rib tip (160), a second scroll unit (200) having a base (230) and a scroll rib (210) projecting from the base (230) with a scroll rib tip (260), wherein the first scroll unit (100) can be moved relative to the second scroll unit (200) along an orbital path and the first scroll unit (100) and the second scroll unit (200) mesh with one another to form compression chambers, and in doing so the scroll rib tip (110, 210) of the scroll rib (110, 210) sealingly cooperates with the base (130, 230) of the respective other scroll unit (100, 200), wherein the base (130) of the first scroll unit (100) and / or the base (230) of the second scroll unit (200) comprises / comprise a pocket (132, 232) with an insert plate (136, 236) arranged in the pocket (132, 232), characterized in that the pocket (132, 232) is arranged at a wall distance (W) from the respective scroll rib (110, 210), and the wall distance (W) between the scroll rib (110, 210) and the pocket (132, 232) of the first scroll unit (100) and / or the second scroll unit (200) is measured transversely to a scroll channel (120, 220) formed by the scroll rib (110, 210).

2. Scroll machine according to claim 1, characterized in that the insert plate (136, 236) is loosely inserted into the respective pocket (132, 232).

3. Scroll machine according to claim 1 or 2, characterized in that the pocket (132, 232) has a pocket depth (D), the insert plate (136, 236) has a plate thickness (B), and the plate thickness (B) is greater than the pocket depth (D).

4. Scroll machine according to one of the preceding claims, characterized in that a transition fillet (135, 235) is provided between the base (130, 230) and the scroll rib (110, 210).

5. Scroll machine according to one of the preceding claims, characterized in that the wall distance (W) approximately corresponds to a radius (R) of the transition fillet (135, 235).

6. Scroll machine according to one of the preceding claims, characterized in that the insert plate (136, 236) has at least one lubrication groove (139, 239).

7. Scroll machine according to one of the preceding claims, characterized in that the second scroll unit (200) has at least one injection opening (250) for a medium from an economizer circuit.

8. Scroll machine (2) according to claim 7, characterized in that the injection opening (250) comprises a recess (242) in the scroll rib (210) of the second scroll unit (200).

9. Scroll machine (2) according to claim 7 or 8, characterized in that the injection opening (250) has a first opening section (251) in the transition fillet (235) and a second opening section (252) in the scroll rib (210).

10. Scroll machine according to one of the preceding claims, characterized in that the scroll rib (110, 210) of the first scroll unit (100) and / or the second scroll unit (200) comprises / comprise a tip seal (170, 270).

11. Scroll machine according to claim 10, characterized in that the insert plate (136, 236) has a sealing surface (138, 238) cooperating with the tip seal (170, 270), and the sealing surface (138, 238) is dimensioned such that, during a complete movement of the first scroll unit (100) along the orbital path, the tip seal (170, 270) passes over the respective insert plate (136, 236) within the sealing surface (138, 238).

12. Scroll machine according to claim 10 or 11, characterized in that the tip seal (170, 270) comprises a sealing body (172, 272) arranged in a groove (175, 275).

13. Scroll machine according to one of claims 10 to 12, characterized in that the tip seal (170, 270) is arranged centrally on the scroll rib tip (160, 260).

14. Scroll machine according to one of claims 10 to 13, characterized in that the tip seal (170, 270) is arranged at a distance (A) from a scroll wall (140, 240) of the scroll rib (110, 210), and the distance (A) from the scroll walls (140, 240) is greater than the wall distance (W) between the pocket (132, 232) and the scroll wall (140, 240).

15. Scroll machine according to one of the preceding claims, characterized in that the scroll rib (110, 210) extends from an inner end section (115, 215) to an outer end section (116, 216), a groove (175, 275) is arranged between the inner end section (115, 215) and the outer end section (116, 216), the groove (175, 275) comprises a tip seal groove section (177, 277) receiving the sealing body (172, 272) and at least one outlet groove section (176, 276, 178, 278) which is arranged between the tip seal groove section (177, 277) and the inner end section (115, 215) and / or between the tip seal groove section (177, 277) and the outer end section (116, 216).

16. Scroll machine according to claim 15, characterized in that the outlet groove section (176, 276, 178, 278) has a second groove depth (T2, T3), and the second groove depth (T2, T3) is smaller than a first groove depth (T1) of the tip seal groove section (177, 277).

17. Refrigeration system (1) having a scroll machine (2) according to one of the preceding claims.

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