Refrigerant system, in particular heat pump, and system housing

Abstract

The invention relates to a refrigerant system (2), in particular a heat pump, with an explosion-proof system housing (4) which has several side walls (16) and a bottom part, wherein at least a part of the side walls (16, 16A, 16B) is connected to the bottom part (12) via at least one tab (18, 18A, 18B) formed on each side wall (16, 16A, 16B), wherein the bottom part (12) has a wall (22) with a slot (20) corresponding to each tab (18, 18A, 18B), wherein the tab (18, 18A, 18B) has a recess (32) extending transversely to the insertion direction (S) and thus in the slot direction (L), so that by laterally displacing the tab (18, 18A, 18B) relative to the slot (20) the tab (18, 18A, 18B) 18B) forms a positive-locking rear grip with the wall (22) that defines the slot (20). This ensures that, in the event of an explosion, the side walls (16) are securely held against the base (12).Preferably the tab (18, 18A,18B) has an obliquely oriented area and can be folded down about a pivot axis (A) when a rear grip is formed.

Description

[0001] The invention relates to a system housing for a refrigerant system, in particular a heat pump, and a refrigerant system with such a system housing.

[0002] Refrigeration systems generally consist of a refrigerant circuit comprising two heat exchangers: an evaporator and a condenser, as well as a compressor and an expansion valve. A refrigerant flows through the refrigerant circuit during operation. At least some of these components are housed in a common system housing. Depending on the design of the refrigerant system, for example, in air-source heat pumps, a split system is often provided, in which the evaporator is located in a separate housing outside the building.

[0003] The systems, especially heat pumps, used to heat buildings are typically located within a room in the building.

[0004] There are a variety of refrigerants that are generally suitable for such refrigerant circuits. For environmental and health reasons, only certain refrigerants will be used in the future. Propane, in particular, is being used more frequently. Propane belongs to the class of refrigerants that are potentially explosive. At a certain enrichment level in the refrigerant, flammable mixtures are formed, and there is therefore a risk of deflagration, explosion, or fire if an flammable mixture is present at the same time as an ignition source.

[0005] Such flammable mixtures can arise in the event of a leak in the refrigerant circuit, particularly within the system housing. Since the system housing also contains electrical and electronic components, particularly switching components for controlling the compressor, for example, there is a possibility that a spark could lead to an explosion under unfavorable circumstances. Therefore, safety measures are necessary. Among other things, it is required that in the event of an explosion, the system housing be designed to be explosion-proof, ensuring that the surroundings of the system are protected from flying system components, especially housing parts.

[0006] The plant casing typically has side walls constructed from sheet metal components that are attached to one another or to a supporting structure. In the event of an explosion, there is a risk that these sheet metal components could be torn from their anchorage and released into the surrounding area. This problem is exacerbated by the requirement for the lowest possible noise emissions. Therefore, the plant casing, especially the casing parts surrounding the compressor, are constructed as tightly as possible, making pressure relief virtually impossible in the event of an explosion.

[0007] Conventional protective measures, for example, involve connecting the sheet metal components to each other with safety cables, thus preventing them from flying apart. However, such a measure is complex and, in particular, involves considerable installation effort. Furthermore, there is a risk that the safety cables will be forgotten when reassembling the side panels after opening the enclosure, for example, during an inspection.

[0008] US 6 168 248 B1 discloses a system housing of a refrigerant system in which side parts are inserted via tabs into corresponding slots of an adjacent side part.

[0009] Further system housings can be found, for example, in US 2021 / 003295 A1, US 2007 / 170827 A1, JP 2012 007777 A, CN 208 635 213 U, CN 215 343 408 U.

[0010] Based on this, the invention is based on the object of specifying a system housing and a refrigerant system with a system housing, wherein the system housing is explosion-proof in such a way that, in the event of an explosion, flying around of side walls of the system housing is prevented with little effort.

[0011] The object is achieved according to the invention by an explosion-proof system housing having the features of claim 1 and by a refrigerant system, in particular a heat pump, having such an explosion-proof system housing.

[0012] The system housing has a plurality of side walls and a base part. At least some of the side walls and preferably all of the side walls are connected to the base part via at least one tab attached to a respective side wall and in particular formed thereon in one piece. Preferably, a respective side wall and in particular all of the side walls are connected to the base part exclusively via the tabs. For this purpose, the base part has a wall which has a corresponding slot for each respective tab, which extends in a slot direction. The slot is typically elongated, for example rectangular or oval, and in particular surrounded on all sides by the edge of the adjacent wall. For assembly, a respective tab can be inserted into the corresponding slot in a plug-in direction.In this case, the plug-in direction is understood to mean a direction perpendicular to the wall in which the slot is formed. The tab has a recess on the edge that runs transversely to the plug-in direction and thus in the direction of the slot, so that when the tab is moved sideways relative to the slot, this tab forms a positive engagement with the wall defining the slot. The tab is therefore roughly hook-shaped and, when installed, engages behind the wall of the base part. This positive connection ensures, in comparison to a simple plug-in connection, that in the event of an explosion the respective side wall cannot be pushed out of the base part against the plug-in direction. This simple means of creating an explosion-proof system enclosure in which the side walls are reliably prevented from flying apart in the event of an explosion.The positive rear grip ensures that they are reliably held to the base part.

[0013] The side walls are preferably connected at their opposite ends to another housing component, for example a cover component or a frame component, or to one another, via a second type of connection which is different from the connection to the base part. This second type of connection, for example a screw connection or a snap-in connection, has, in a preferred embodiment, a lower holding force than the positive connection via the tabs. In the event of an explosion, this results in this second type of connection being broken open and released in the upper region of the side walls, so that the side walls are forced apart in the upper region but are simultaneously secured to the base part with their lower end. This allows, for example, explosion pressure to escape easily from the housing.Preferably, the side walls are only attached to the bottom part via the tabs and to the other housing part at the top via the second type of connection.

[0014] In a useful further development, the tab has an area which is oriented at an angle with respect to the insertion direction. This angled orientation enables, in particular, a pivoting movement of the respective side wall when the rear grip is present and when the tab is inserted. This has advantages during assembly, as will be explained in more detail below. Furthermore, in the event of damage, this also enables a respective side wall to move from its final assembly position, in which the side wall is typically oriented vertically, into a folded-away position so that the explosion pressure can escape. This angled area of ​​the tab projects in particular into a free space within the base part, without the angled area being in contact with a wall area specifically of the base part.The obliquely oriented area, hereinafter also referred to as the intermediate area, therefore has - at least when the side wall is in its normal final assembly position - a free space or escape space to such a wall area, so that pivoting of the tab and thus of the side wall is possible.

[0015] This intermediate area is preferably angled and oriented at an angle between 45° and 85° and in particular at an angle between 55° and 75° relative to the plugging direction.

[0016] At the same time, this diagonally oriented intermediate area allows the side wall to be inserted into the slot in an inclined position and then, even in this inclined position, also referred to as the intermediate assembly position, to be moved laterally to form the rear grip. In a practical embodiment, the tab is therefore designed in such a way that such an intermediate assembly position is possible, in which the lateral displacement just described to form the positive rear grip can take place, but the side wall is still in a folded-down position from which it can then be folded up into the final assembly position with the rear grip already formed. The final assembly position is understood to be the position the side wall assumes when the system housing is fully assembled.As previously mentioned, this final assembly position corresponds to a vertical alignment of the side panel in which it is attached to the other housing part with its upper end.

[0017] In a preferred embodiment, the recess has a depth extending transversely to the slot direction and thus approximately in the insertion direction, which depth allows such lateral displacement of the side wall to form the positive engagement, so that the side wall is spaced apart from the base part. The depth of the recess therefore enables a compensating movement of the tab through the slot even when the engagement is formed. Where reference is made to a distance here, this is understood to mean a multiple of the wall thickness, for example at least five times the wall thickness. This also means that the depth is also a multiple of the wall thickness and in particular at least five times the wall thickness. In a preferred embodiment, the depth is specifically greater than 0.5 cm, in particular greater than 1 cm or even greater than 2 cm. In particular, it is greater than the thickness of the side wall itself.The sidewall generally covers one side surface of the system housing. The thickness of the sidewall is defined as the extent of the sidewall perpendicular to this side surface. Sidewalls are typically sheet metal components with folded edges, so the thickness of the sidewall is defined by the folded edge.

[0018] The special design of the recess, with its comparatively deep depth, allows the side panel to be moved laterally past interfering structures in the folded-down intermediate assembly position. Specifically, this allows each side panel to initially be guided past its adjacent, corner-mounted side panel, which, for example, protrudes laterally from the base panel and thus forms an interfering contour. The side panel is then moved toward the base panel, i.e., the tab is pushed further through the slot.

[0019] In a useful further development - particularly in such a constellation - the tabs of adjacent side walls are of different lengths, viewed in a direction transverse to the slot direction. In particular, the diagonally oriented regions have a different length. This means that the tabs of one side wall specifically have the previously described large recess depth in order to be able to be pushed laterally past the other side wall. In contrast, the depth of the recess in the tab of the other side wall is significantly smaller, so that the entire tab is also shorter. The depth of the recess in the tab of the other side wall is preferably only dimensioned such that the rear grip can be formed and is, for example, only a maximum of three times the thickness of the slot wall. In particular, it is a maximum of half the depth of the tab of the first-mentioned side wall.

[0020] In a preferred embodiment, the tab, in addition to the diagonally oriented intermediate region, has an adjoining, bent end region. This is therefore oriented at a different angle than the intermediate region. This end region provides additional positive locking, especially in the folded-over intermediate assembly position. If the side wall is in the intermediate assembly position, for example in the event of damage after being folded over, the side wall is positively secured against slipping out of the slot by the end region, even if it were to be additionally moved laterally. This design also facilitates assembly. In particular, it facilitates insertion of the tab into an adjacent housing part, in particular into the base part.

[0021] The tab generally has an initial section extending in the insertion direction, which transitions via a first curved section into the diagonally oriented intermediate section. The first curved section, in which the tab forms a curve, thus essentially defines a pivot axis around which the side wall can be folded.

[0022] The obliquely oriented intermediate region preferably transitions into the end region via a second curved region. The two curved regions are preferably curved in opposite directions. Furthermore, they are otherwise particularly similar, i.e., they have the same radius of curvature and the same arc length. As a result, the tab, viewed in cross-section, is formed by a stepped shape with two regions oriented parallel to one another, namely the initial region and the end region, as well as the obliquely extending intermediate region arranged between them.

[0023] Therefore, the end region preferably extends in the same direction as the beginning region. It runs, in particular, parallel to a horizontal line.

[0024] The recess described above is preferably formed in the intermediate region and preferably extends into the first arc region or into the initial region.

[0025] The wall of the base part, in which the corresponding slots for inserting the tabs are formed, extends in a preferred embodiment vertically and thus parallel to the upward extension of the side walls (when these are in their final assembly position). The side walls are therefore inserted laterally into this vertical wall using the tabs. The respective side wall is preferably supported on the base part via the tabs, and preferably exclusively via the tabs. Therefore, they are not supported on the base part with their edges.

[0026] The base section is typically formed as a circumferential frame member made of one or more folded sheets. Specifically, the base section has a U-shaped profile in cross-section, with one leg of the U forming the horizontal base plate.

[0027] An embodiment of the invention is explained in more detail below with reference to the figures, which show in simplified representations FIG 1 shows a partial view of a heat pump, FIG 2 shows a partial perspective view looking from below onto a base part with a tab of a first, short tab type inserted through a slot, FIG 3 shows an enlarged view of the FIG 2 area marked with a rectangle, similar to FIG 4 FIG 2 a partial perspective view from below of the base part with a further tab of a second, long tab type inserted through a slot, FIG 5 an enlarged view of the FIG 4 with a rectangle marked area, FIG 6 an enlarged partial view of a side wall with molded tab of the first short tab type, FIG 7 a partial perspective view of a base part with a first side wall in a final assembly position and with a second side wall adjacent to this at a corner in a folded-down intermediate assembly position, FIG 8 several side walls arranged next to one another with different tab types.

[0028] One in FIG 1 The refrigerant system shown in Figure 1 and designed as a heat pump 2 comprises a system housing 4 within which at least some components of a refrigerant circuit are located. Examples shown in Figure 1 are FIG 1 a compressor 6 and a fan 8, which is connected upstream of an evaporator (not shown in detail here). In the exemplary embodiment, the system housing 4 has several separate sub-areas, namely a compressor chamber 4A and an evaporator chamber 4B, which are separated from each other by a partition wall 10.

[0029] The system housing 4 generally comprises a base part 12, a cover part 14, and a plurality of side walls arranged between the base part 12 and the cover parts 14, which are provided with the general reference numeral 16. The side walls 16 are designed differently in the exemplary embodiment. The side walls 16 close off the system housing 4 from the environment at a front side, at a rear side, and at opposite end faces. In the illustration of the FIG 1 the side walls 16 of the front are not shown.

[0030] In the exemplary embodiment, the front and rear of the system housing 4 each have two side walls 16A, 16C arranged side by side, one of which delimits the compressor chamber 4A and one of which delimits the evaporator chamber 4B. The side walls that delimit the compressor chamber 4A are designated by reference numeral 16A for the side walls on the front and rear sides and by reference numeral 16B for the lateral (front) side walls. These side walls 16A, 16B are designed as flat, closed side walls. The intermediate wall 10 is also designed as a flat, closed wall section. The compressor chamber 4A is therefore designed as a closed sub-chamber overall.

[0031] The side walls that border the evaporator chamber 4B at the front and rear, on the other hand, are provided with airflow openings and are designed, in particular, in the manner of a grid. They are designated by reference numeral 16C. Finally, the lateral wall that borders the evaporator chamber 4B at the sides is designated by reference numeral 16D. This lateral wall 16D preferably covers a switch compartment area.

[0032] All side walls 16 extend in their final assembly position, i.e. in the final assembled state of the system housing 4, in a vertical direction V and connect the base part 12 with the cover part 14. The side walls 16 are in particular folded sheet metal parts, which therefore have a circumferential edge forming a kind of frame (compare in particular Figur 6 ).

[0033] The base part 12 also has a surrounding frame, which is formed in particular by a folded edge. The base part 12 is designed as a bent sheet metal part. The surrounding frame has, in particular, a U-shaped profile due to the folded edge.

[0034] All side walls 16 are preferably connected to the base part 12 exclusively via tabs 18. Different types of tabs 18 are provided, as will be explained in more detail below. At their upper end, the side walls 16 are connected to the cover part 14, screwed in this embodiment. Preferably, the side walls 16 are connected only at their lower end to the base part 12 and at their upper end to the cover part 14. Preferably, no further fastenings are provided between them.

[0035] As can be seen specifically from the FIG 2 bis FIG 5 As can be seen, at least some of the side walls 16, especially the side walls 16A, 16B, which delimit the compressor chamber 4A, have specially shaped tabs 18A, 18B, which, in a final assembly position of the side walls 16A, 16B, form a positive engagement with the base part 12. The lateral side wall 16D also has such specially shaped tabs. These are also referred to here as pressure-resistant tabs 18A, 18B, since their design, which will be described in detail below, prevents the side parts 16A, 16B from being thrown away in the event of a sudden pressure increase. FIG 2 bis FIG 5 each show partial, perspective views from below of the base part 12 and serve to illustrate the fastening of the side walls 16A, 16B via the tabs 18A, 18B.

[0036] The base part 12 generally has elongated slots 20 for fastening the side walls 16, which are formed in a wall 22 of the base part 12. The slots 20 extend in a longitudinal direction, which is also referred to below as the slot direction L.

[0037] The two U-shaped legs of the cross-sectionally U-shaped frame of the base part 12 are oriented horizontally, and the area connecting the two U-shaped legs is oriented in the vertical direction V and forms the circumferential wall 22, in which the slots 20 are inserted. Therefore, the wall 22 with the slots 20 is generally oriented in the vertical direction V. The side walls 16 are inserted laterally with their tabs 18 facing forward into these slots 22 and are supported on the base part 12 solely via these tabs 18.

[0038] The (pressure-resistant) tabs 18A, 18B have a special shape that ensures that in the event of damage or explosion, the side walls 16A, 16B can only fold down, but are held in place by the tabs 18A, 18B. Generally, the tabs 18A, 18B form a rear engagement with the wall 22 when assembled.

[0039] The special geometry of the tabs 18B is described below using the FIG 6 explained in more detail, in which a side wall 16B with a tab 18B is shown. The tabs 18A are designed similarly to the tabs 18B and the following description therefore also applies equally to the tabs 18A. The differences between the two tab types are discussed below.

[0040] In the exemplary embodiment, the tabs 18A, 18B are composed of several regions, namely a starting region 24, an obliquely oriented intermediate region 26 and an end region 28 which is in turn angled towards the intermediate region 26. The starting region 24 merges via a first curved region 30A into the intermediate region 26 and this merges via a second curved region 30B into the end region 28. The individual regions each extend in a transverse direction Q which, in the assembled state, runs parallel to the slot direction L. The starting region 24 extends in a plug-in direction S which is oriented transversely to the slot direction L and thus also transversely (perpendicularly) to the respective transverse direction Q. The tabs 18A, 18B are bent sheet metal parts which are integral components of the side walls 16 which are designed in particular as bent sheet metal stamped parts.

[0041] The tabs 18A, 18B generally have a tab width in the transverse direction Q which typically extends over several centimeters, for example over 3-10 cm.

[0042] In the transition area from the initial area 24 to the intermediate area 26, a recess 32 is formed which extends in the transverse direction Q and is open to one edge side of the respective tab 18A, 18B. The recess 32 is slit-shaped, at least in the case of the tabs 18B. The recess 32 extends in the transverse direction Q, for example, over half the width of the tab 18A, 18B. The recess extends in the transverse direction Q, for example, over 3-5 cm. The recess 32 has a depth T perpendicular to the transverse direction (cf. also FIG 5 as well as FIG 8 ). The recess 32 is formed mainly in the intermediate region 26.

[0043] The two different tab types differ essentially in their depth T and thus, in particular, in the different lengths of the tabs 18A, 18B transverse to the transverse direction. Thus, the tab 18A of the first type has a significantly greater depth T than that of the second type 18B and is therefore significantly longer overall—viewed transverse to the transverse direction Q—than that of the second type. The longer tabs 18A are therefore also referred to as long tabs 18A, and those of the second type are also referred to as short tabs 18B.

[0044] To form the differently deep recesses 32, preferably only the intermediate regions 26 of the two tab types have different lengths perpendicular to the transverse direction Q. The other partial regions of the tabs 18A, 18B are preferably identical to one another.

[0045] The long tabs 18A preferably have a length such that in the assembled final state they are located with their end region 28 in the vicinity of a bottom-side leg of the U-shaped bottom part 12 and are spaced from this, for example, only by a tolerance gap, as can be seen from the FIG 5 can be seen.

[0046] As shown by the FIG 6 As can be seen, the intermediate region 26 is arranged at an angle α with respect to the insertion direction S, which, for example, is in the range between 45° and 85°. The end region 28 preferably extends again in the insertion direction S and is thus aligned parallel to the initial region 24. The tabs 18A, 18B are therefore approximately Z-shaped or stepped in cross-section.

[0047] The assembly of the side walls 16 and their arrangement are described in particular in connection with FIG 7 and in addition with FIG 8 explained.

[0048] When mounting a respective side wall 16A, 16B, this is done as shown in FIG 7 illustrated by the side wall 16A - initially in an obliquely oriented, folded-down position with the tabs 18A first inserted into the base part 12. For this purpose, the tabs 18A are inserted through the slots 20 and threaded in, so that the individual areas 26, 28 are each oriented perpendicular to the slot 20 and thus the wall 22.

[0049] If the side wall 16A is in the folded-down position, a lateral displacement in the transverse direction Q takes place, so that the recess 32 is pushed over the wall 22 and the tab 18A with its intermediate region 26, more precisely with the remaining section which extends in the transverse direction Q over the recess 32, forms a rear grip with the wall 22 (compare in particular also FIG2 bis FIG 5 ).

[0050] From this intermediate assembly position, the side wall 16A is then pivoted around a pivot axis A (cf. FIG 6 ) is folded up into the upright, vertical final assembly position. The pivot axis A runs essentially along the transverse direction Q, specifically in the area of ​​the first curved section 30A.

[0051] This assembly process is also identical for the tabs 18B.

[0052] In the exemplary embodiment, side walls 16 are provided with different types of tabs 18. Each side wall preferably has only tabs of the same type. Alternatively, side walls 16 with similar tabs 18 are used for the system housing 4.

[0053] During assembly, in the exemplary embodiment, the side wall 16B is first mounted with the short tabs 18B and brought into its vertical, upright final assembly position. FIG 7 As can be seen, this side wall 16B protrudes laterally over the base part 12 at the edge. When the further side wall 16A with the long tabs 18A is assembled, this is inserted into the slots 20 with the tabs 18A first. However, it is initially spaced a distance a from the wall 22 of the base part 12. The distance a is made possible by the great depth T of the recess 32 of the tabs 18A. The distance a is dimensioned such that the side wall 16 can be pushed laterally in the transverse direction Q past the protruding interfering contour of the already assembled side wall in order to form the positive engagement. The side wall 16 with the long tabs 18A is then fully inserted into the base part 12 and folded up into the final vertical assembly position.

[0054] However, this assembly or disassembly sequence is not mandatory. Other sequences are also possible using the tabs shown.

[0055] FIG 8 shows a partial perspective view of three side parts 16, namely the side parts 16A, 16B and 16C in their arrangement on the base part 12, which, however, is FIG 8 is hidden. As can be seen at first glance, each side wall 16A, 16B, 16C has tabs 18A, 18B, 18C of the same type. In the exemplary embodiment, the two side walls 16A and 16B, which are adjacent to one another at a corner, each have different types of tabs 18A, 18B.

[0056] As shown by FIG 8 As can also be seen, the additional front or rear side part 16C, which is designed as a grid and delimits the evaporator chamber 4B, is formed with conventional, simple tabs 18C that do not form a rear grip and are simply inserted. In principle, this side wall 16C can also be provided with the special tabs 18A, 18B described here to form a rear grip. However, due to the grid, the pressure in this side wall 16C can escape more easily in the event of an explosion.

[0057] In the event of damage, i.e. in the event of an explosion, the resulting pressure, especially within the compressor chamber 4A, will release the fastening of the side walls 16A, 16B at the upper area, i.e. in particular at the cover part 14, and the respective side wall 16A, 16B can fold down laterally around the pivot axis A and come to rest on the floor, for example, as shown in FIG 1 illustrated by the arrow.

[0058] The special design of the tabs 18A, 18B creates a reliable positive locking mechanism which, on the one hand, enables the side walls 16 to be folded down sideways and, at the same time, prevents the side walls 16 from being thrown into the environment by the explosion pressure. List of reference symbols

[0059] 2 Heat pump 4 System housing 4 A Compressor chamber 4 B Evaporator chamber 6 Compressor 8 Fan 10 Partition wall 12 Base section 14 Cover section 16, 16A-D Side walls 18 Tabs 18A Long tab 18B Short tab 18C Normal tab 20 Slot 22 Wall 24 Starting area 26 Diagonally oriented area (intermediate area) 28 End area 30A First curved area 30B Second curved area 32 Recess QTransverse direction VVertical direction SSocking direction LSlot direction TTepth aDistance APivot axis

Claims

1. System housing (4) for a refrigerant system (2), comprising multiple side walls (16) and a base part, wherein at least some of the side walls (16, 16A, 16B) are connected, via at least one tab (18, 18A, 18B) formed integrally on a respective side wall (16), to the base part (12), wherein the base part (12) has a wall (22) with a slot (20) corresponding to a respective tab (18, 18A, 18B), which extends in a slot direction (L) and into which the respective tab (18, 18A, 18B) is pluggable in a plug-in direction (S), characterized in that the tab (18, 18A, 18B) has a recess (32) extending transversely to the plug-in direction (S), and thus in the slot direction (L), so that, by way of a lateral displacement of the tab (18, 18A, 18B) relative to the slot (20), the tab (18, 18A, 18B) forms form-fitting rear engagement with respect to the wall (22) delimiting the slot (20).

2. System housing (4) according to the preceding claim, in which the side walls (16) are connected to a further housing part at their end situated opposite the base part (12) via a second type of connection, wherein the second type of connection has a smaller holding force than the connection of the side walls (16) to the base part (12).

3. System housing (4) according to either of the preceding claims, in which the tab (18, 18A, 18B) has a region (26) that is oriented obliquely in relation to the plug-in direction (S).

4. System housing (4) according to the preceding claim, in which the obliquely oriented region (26) is oriented at an angle between 45° and 85°, and in particular at an angle between 55° and 75°, relative to the plug-in direction (S).

5. System housing (4) according to one of the preceding claims, in which the tab (18, 18A, 18B) is formed in such a way as to allow an intermediate mounting position in which the lateral displacement for forming the form-fitting rear engagement can already take place but the side wall (16, 16A, 16B) is still in a swung-down position from which it can be swung up into a mounting end position with rear engagement formed.

6. System housing (4) according to one of the preceding claims, in which the recess (32) has a depth extending transversely to the slot direction (L), said depth allowing a displacement of the side wall (16, 16A, 16B) at a distance (a) from the base part (12) for forming the form-fitting rear engagement.

7. System housing (4) according to the preceding claim, in which the distance (a) is greater than 0.5 cm, in particular greater than 1 cm, and in particular greater than a thickness of the side wall (16).

8. System housing (4) according to one of the preceding claims, in which the tabs (18, 18A, 18B) of side walls (16, 16A, 16B) which are adjacent to one another across a corner are of different lengths.

9. System housing (4) according to one of the preceding claims and according to Claim 3, in which, in addition to the obliquely oriented region (26), the tab (18, 18A, 18B) has an end region (28) which is bent away in relation thereto.

10. System housing (4) according to one of the preceding claims and according to Claim 3, in which the tab (18, 18A, 18B) has an initial region (24) which extends in the plug-in direction (S) and which transitions into the obliquely oriented region (26) via a first curved region (30A).

11. System housing (4) according to the two preceding claims, in which the obliquely oriented region (26) transitions into the end region (28) via a second curved region (30B), wherein the two curved regions (30A, 30B) are curved in opposite directions.

12. System housing (4) according to one of Claims 9 to 12, in which the end region (28) extends in the plug-in direction (S).

13. System housing (4) according to one of the preceding claims, in which the wall (22) of the base part (12) in which the slots (20) are formed extends in the vertical direction (V), wherein the side walls (16) are preferably supported against the base part (12) via the tabs (18, 18A, 18B).

14. Refrigerant system (2), in particular heat pump, having a system housing (4) according to one of the preceding claims.

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