EP4293291A1 - Refrigerant system, in particular heat pump, and system housing - Google Patents

Abstract

The invention relates to a refrigerant system (2), in particular a heat pump, with an explosion-proof system housing (4) which has a plurality of side walls (16) and a base part, with at least some of the side walls (16, 16A, 16B) having at least one on a respective side wall (16, 16A, 16B) molded tab (18, 18A, 18B) is connected to the base part (12), the base part (12) having a wall (22) corresponding to a respective tab (18, 18A, 18B). Has slot (20), the tab (18, 18A, 18B) having a recess (32) running transversely to the insertion direction (S) and thus in the slot direction (L), so that by moving the tab (18, 18A) laterally, 18B) relative to the slot (20), the tab (18, 18A, 18B) forms a positive rear grip with the wall (22) delimiting the slot (20). As a result, in the event of an explosion, side walls (16) are securely held on the base part (12). The tab (18, 18A, 18B) preferably has an obliquely oriented area and can be folded down about a pivot axis (A) with a rear grip formed.

Description

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

Refrigerant systems generally have a refrigerant circuit which has two heat exchangers, namely an evaporator and a condenser and also a compressor and an expansion valve. During operation, a refrigerant flows in the refrigerant circuit. At least some of these components are housed in a common system housing. Depending on the design of the refrigerant system, for example with air-refrigerant heat pumps, a split exhibition is often provided, in which the evaporator is arranged in a separate housing outside the building.

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

There are a variety of refrigerants that are generally suitable for such refrigerant circuits. For environmental reasons but also for health protection reasons, only certain refrigerants will be used in the future. In particular, propane is being used more and more. Propane belongs to the class of refrigerants that are explosive. When the refrigerant is enriched to a certain extent, ignitable mixtures are formed and there is therefore a risk of deflagration, explosion or fire if an ignitable mixture is present at the same time as an ignition source.

Such ignitable mixtures can arise in the event of a leak in the refrigerant circuit, especially within the system housing. Because within the There are also electrical and electronic components in the system housing, in particular switching components, for example for controlling the compressor, there is the possibility that a spark can lead to an explosion under unfavorable circumstances. Therefore, security measures are required. Among other things, it is required that in the event of an explosion, the system housing is designed to be explosion-proof in such a way that the area surrounding the system is protected from flying system parts, especially housing parts.

The system housing typically has side walls designed as sheet metal components, which are attached to one another or to a supporting component. In the event of an explosion, there is a risk that these sheet metal components could be torn from their anchoring and fly into the surrounding area. This problem is exacerbated by the requirement for the lowest possible noise emissions, since the system housing, in particular the housing parts surrounding the compressor, are built as tightly as possible and pressure relief is therefore hardly possible in the event of an explosion.

Conventional protective measures, for example, provide that the sheet metal components are connected to one another with safety ropes, so that the sheet metal components are prevented from flying apart. However, such a measure is complex and, in particular, involves a lot of assembly work. There is also a risk that when the side walls are reassembled after the housing has been opened, for example as part of an inspection, the safety cables will be forgotten to attach.

Based on this, the invention is based on the object of specifying a refrigerant system, especially a heat pump, with a system housing and a system housing for such a refrigerant system, the system housing being explosion-proof to the extent that, in the event of an explosion, side walls of the system housing are prevented from flying around with little effort .

The object is achieved according to the invention by a refrigerant system, in particular a heat pump with an explosion-proof system housing with the features of claim 1 and by such an explosion-proof system housing. The advantages and preferred configurations mentioned in connection with the refrigerant system can easily be transferred to the system housing as such.

The system housing has several side walls and a base part. At least some of the side walls and preferably all side walls are connected to the base part via at least one tab attached to a respective side wall and in particular integrally formed. A respective side wall is preferred and in particular all 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 one insertion direction. In the present case, the plug-in direction is understood to mean, in particular, a direction perpendicular to the wall in which the slot is formed. The tab has an edge-side recess running transversely to the insertion direction and thus in the direction of the slot, so that by moving the tab laterally relative to the slot, this tab forms a positive engagement with the wall delimiting the slot. The tab is therefore approximately hook-shaped and, when assembled, engages behind the wall of the base part. Compared to a simple plug-in connection, this form-fitting connection ensures that in the event of an explosion, the respective side wall cannot be pushed out of the base part in the opposite direction to the plug-in direction. As a result, an explosion-proof system housing is designed using simple means, in which the side walls are reliably prevented from flying apart in the event of an explosion. Thanks to the form-fitting rear grip, these are reliably held on the base part.

The side walls are preferably connected at their opposite ends via a different, second type of connection - compared to their connection to the base part - to another housing component, for example a cover component or a frame component, or to one another. In a preferred embodiment, this second type of connection, for example a screw connection or a snap-in connection, has a lower holding force compared to the positive connection via the tabs. In the event of an explosion, this leads to this second type of connection being broken and loosened in the upper region of the side walls, so that the side walls are pushed apart in the upper region, but at the same time their lower end is secured to the base part. This allows, for example, an explosion pressure to escape easily from the housing. The side walls are preferably only attached to the bottom part via the tabs at the bottom and to the further housing part at the top via the second type of connection.

In a useful further development, the tab has an area which is oriented obliquely with respect to the insertion direction. This oblique orientation enables, in particular, a pivoting movement of the respective side wall when there is a rear grip and when the tab is inserted. This has advantages both during assembly, as will be explained in more detail below. In addition, in the event of damage, this also enables a respective side wall to move out of its final assembly position, in which the side wall is typically vertically aligned, into a folded away position so that the explosion pressure can escape. This obliquely oriented area of the tab projects in particular into a free space within the base part, without the obliquely oriented area resting against 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 alternative space in relation to such a wall area, so that the tab and thus the side wall can be pivoted.

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

At the same time, this obliquely oriented intermediate area allows the side wall to be inserted into the slot in an oblique position and then also in this oblique position, hereinafter also referred to as the intermediate assembly position, to be moved laterally to form the rear grip. In an expedient embodiment, the tab as a whole is designed in such a way that such an intermediate assembly position is possible in which the lateral displacement just described can take place to form the positive rear grip, but the side wall is still in a folded down position from which it can then can be folded up into the final assembly position with the rear grip already formed. The final assembly position is the position of the side wall that it occupies when the system housing is fully assembled. As mentioned before, this assembly end position corresponds to a vertical orientation of the side wall in which its upper end is attached to the further housing part.

In a preferred embodiment, the recess has a depth that extends transversely to the slot direction and thus approximately in the insertion direction, which allows such a lateral displacement of the side wall to form the positive rear grip, so that the side wall is spaced a distance from the base part. Due to the depth of the recess, a compensating movement of the tab through the slot is possible even with a rear grip. If we are talking about a distance here, this means a multiple of the wall thickness, for example at least five times the wall thickness. At the same time, this means that the depth is also a multiple of the wall thickness and in particular at least five times the wall thickness. Specifically, in a preferred embodiment, the depth is greater than 0.5 cm, in particular greater than 1 cm or even greater than 2 cm. Specifically, it is greater than a thickness of the side wall itself. The side wall generally covers a side surface of the system housing. The thickness of the side wall is the extent the side wall is understood to be perpendicular to this side surface. The side walls are typically sheet metal components with folded edges, so that the thickness of the side wall is defined by the fold.

The special design of the recess with the comparatively large depth enables the side wall to be moved laterally in the folded-over intermediate assembly position past interfering structures. In particular, this makes it possible for the respective side wall to initially be guided past its adjacent side wall arranged at a corner, which, for example, protrudes laterally from the base part and thereby forms an interfering contour. The side wall is then moved towards the bottom part, i.e. H. the tab is pushed further through the slot.

In an expedient further development - especially in such a constellation - the tabs of side walls adjacent to each other at corners are of different lengths, viewed in a direction transverse to the direction of the slot. In particular, the obliquely oriented areas have a different length. This means that the tabs of one side wall specifically have the previously described large depth of the recess 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.

In a preferred development, the tab has, in addition to the obliquely oriented intermediate region, an adjoining, bent end region. This is therefore oriented at a different angle than the intermediate area. This end area 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 folding over, the side wall - even if it were additionally moved laterally - is positively secured by the end region against sliding out of the slot. This design also makes assembly easier. In particular, this makes it easier to insert the tab into an adjacent housing part, in particular into the base part.

The tab generally has an initial area extending in the insertion direction, which merges into the obliquely oriented intermediate area via a first curved area. A pivot axis is defined over the first arc region, in which the tab forms a curvature, so to speak, around which the side wall can be folded.

The obliquely oriented intermediate region preferably merges into the end region via a second arch region. The two arch areas are preferably curved in opposite directions. Furthermore, they are otherwise particularly similar, i.e. H. they have the same radius of curvature and the same arc length. As a result, when viewed in cross section, the tab as a whole is formed by a step shape with the two areas oriented parallel to one another, namely the initial area and the end area, as well as the oblique intermediate area arranged between them.

Therefore, the end region, like the initial region, preferably extends in the insertion direction. In particular, it runs parallel to a horizontal line.

The recess described above is preferably formed in the intermediate region and preferably extends into the first arch region or up to the initial region.

The wall of the base part, in which the corresponding slots for inserting the tabs are formed, extends in a preferred embodiment in the vertical direction and thus parallel to the upwardly oriented extension of the side walls (when they are in their final assembly position). The side walls are therefore laterally inserted into this vertical wall using the tabs plugged in. The respective side wall is preferably supported on the base part via the tabs and preferably exclusively via the tabs. They therefore do not support themselves with their edge on the base part.

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

FIG 1

eine Teilansicht einer Wärmepumpe,

FIG 2

eine ausschnittsweise perspektivische Darstellung mit Blick von unten auf ein Bodenteil mit einer durch einen Schlitz eingesteckten Lasche eines ersten, kurzen Laschentyps,

FIG 3

eine vergrößerte Darstellung des in FIG 2 mit einem Rechteck gekennzeichneten Bereichs,

FIG 4

ähnlich FIG 2 eine ausschnittsweise perspektivische Darstellung mit Blick von unten auf das Bodenteil mit einer weiteren, durch einen Schlitz eingesteckten Lasche eines zweiten, langen Laschentyps,

FIG 5

eine vergrößerte Darstellung des in FIG 4 mit einem Rechteck gekennzeichneten Bereichs,

FIG 6

eine vergrößerte ausschnittsweise Darstellung einer Seitenwand mit angeformter Lasche des ersten kurzen Laschentyps,

FIG 7

eine ausschnittsweise perspektivische Darstellung eines Bodenteils mit einer ersten Seitenwand in einer Montage-Endposition sowie mit einer zweiten an dieser über Eck angrenzenden Seitenwand in einer abgeklappten Zwischenmontage-Position,

FIG 8

mehrere nebeneinander angeordnete Seitenwände mit unterschiedlichen Laschentypen.

An exemplary embodiment of the invention is explained in more detail below with reference to the figures. These show in simplified representations

FIG 1

a partial view of a heat pump,

FIG 2

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

an enlarged view of the in FIG 2 area marked with a rectangle,

FIG 4

similar FIG 2 a partial perspective view looking from below onto the base part with another tab of a second, long tab type inserted through a slot,

FIG 5

an enlarged view of the in FIG 4 area marked with a rectangle,

FIG 6

an enlarged partial representation of a side wall with a 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 adjoining this at the corner in a folded-down intermediate assembly position,

FIG 8

several side walls arranged next to each other with different types of tabs.

One in FIG 1 The refrigerant system shown and designed as a heat pump 2 has a system housing 4, within which at least some components of a refrigerant circuit are located. Examples are shown in FIG 1 a compressor 6 and a fan 8, which is connected upstream of an evaporator, not shown here. In the exemplary embodiment, the system housing 4 has several subareas delimited from one another, namely a compressor space 4A and an evaporator space 4B, which are separated from one another by an intermediate wall 10.

The system housing 4 generally has a base part 12, a cover part 14 and a plurality of side walls arranged between the base part 12 and cover parts 14, which are provided with the general reference number 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 on a front side, on a back side and on opposite end faces. In the representation of the FIG 1 the side walls 16 of the front are not shown.

In the exemplary embodiment, the front and the back of the system housing 4 each have two side walls 16A, 16C arranged next to one another, one of which delimits the compressor space 4A and one delimits the evaporator space 4B. The side walls that delimit the compressor space 4A are designated by the reference numeral 16A for the side walls at the front and rear and by the reference numeral 16B for the side (front) side wall. These side walls 16A, 16B are designed as flat, closed side walls. The intermediate wall 10 is also designed as a flat, closed wall part. The compressor space 4A is therefore designed overall as a closed subspace.

The side walls that delimit the evaporator space 4B on the front and back are, in contrast, provided with air flow openings and are in particular designed in the manner of a grid. They are designated by the reference number 16C. Finally, the side wall, which is the Evaporator space 4B is designated laterally with the reference number 16D. This lateral side wall 16D preferably covers a control room area.

All side walls 16 extend in their end 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, i.e. one circumferential and one Have a kind of frame-forming edge (compare in particular Figure 6 ).

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

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 on in the exemplary embodiment. The side walls 16 are preferably 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 in between.

How specifically based on the FIG 2 to FIG 5 can be seen, at least some of the side walls 16, especially the side walls 16A, 16B, which delimit the compressor space 4A, have specially shaped tabs 18A, 18B, which in an end assembly position of the side walls 16A, 16B have a positive engagement with the Form 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 increase in pressure. The FIG 2 to FIG 5 each show excerpts, perspective views from below of the base part 12 and serve to illustrate the attachment of the side walls 16A, 16B via the tabs 18A, 18B.

The base part 12 generally has elongated slots 20 for fastening the side walls 16, which are made 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.

The two U-legs of the frame of the base part 12, which has a U-shaped cross-section, are oriented horizontally and the area connecting the two U-legs is oriented in the vertical direction V and forms the circumferential wall 22 in which the slots 20 are made. In general, the wall 22 with the slots 20 is oriented in the vertical direction V. The side walls 16 are inserted laterally with their tabs 18 into these slots 22 and are only supported on the base part 12 via these tabs 18.

The (pressure-resistant) tabs 18A, 18B have a special shape, which ensures that in the event of damage or an explosion, the side walls 16A, 16B can only fold down, but are held in a form-fitting manner by the tabs 18A, 18B. In general, the tabs 18A, 18B form a rear grip with the wall 22 when assembled.

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

In the exemplary embodiment, the tabs 18A, 18B are composed of several areas, namely an initial area 24, an obliquely oriented intermediate area 26 and an end area 28 which is again angled towards the intermediate area 26. The initial area 24 goes into the intermediate area 26 via a first curved area 30A and this one over a second Arch area 30 B into the end area 28. The individual areas each extend in a transverse direction Q, which runs parallel to the slot direction L in the assembled state. The initial area 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 curved sheet metal parts which are integral components of the side walls 16, which are designed in particular as bending sheet metal parts.

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

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 an edge side of the respective tab 18A, 18B. The recess 32 is slot-shaped at least at 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 (see also FIG 5 as well as FIG 8 ). The recess 32 is mainly formed in the intermediate region 26.

The two different types of tabs differ essentially in a different depth T and therefore in particular also in a different length of the tabs 18A, 18B transversely to the transverse direction. The tab 18A of the first type has a significantly greater depth T than that of the second type 18B and is therefore overall - viewed transversely to the transverse direction Q - significantly longer 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.

To form the recesses 32 of different depths, only the intermediate regions 26 of the two types of tabs preferably have different ones Lengths perpendicular to the transverse direction Q. The other partial areas of the tabs 18A, 18B are preferably designed identically to one another.

The long tabs 18A preferably have such a length that, in the final assembled state, their end region 28 is located in the vicinity of a bottom leg of the U-shaped base part 12 and is spaced from it, for example, only by a tolerance gap, as shown in FIG FIG 5 can be recognized.

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

The assembly of the side walls 16 and their arrangement are particularly related to FIG 7 as well as in addition FIG 8 explained.

When assembling a respective side wall 16A, 16B, this is - as in FIG 7 shown using the side wall 16A - initially inserted into the base part 12 in an obliquely oriented, folded position with the tabs 18A in front. For this purpose, the tabs 18A are inserted through the slots 20 and threaded in, so that the individual areas 26, 28 are oriented in sections perpendicular to the slot 20 and thus the wall 22.

If the side wall 16A is in the folded down position, there is a lateral displacement in the transverse direction Q, 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 the recess 32 extends, forming a rear grip with the wall 22 (see also in particular FIG2 to FIG5 ).

From this intermediate assembly position, the side wall 16A is then turned around a pivot axis A (see FIG 6 ) folded up into the upright, vertical assembly end position. The pivot axis A runs essentially along the transverse direction Q, specifically in the area of the first arc region 30A.

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

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

During assembly, in the exemplary embodiment, the side wall 16B is first assembled with the short tabs 18B and brought into its vertical, upright final assembly position. How based FIG 7 can be seen, this side wall 16B protrudes laterally over the bottom part 12 at the edge. When assembling the further side wall 16A with the long tabs 18A, it is inserted into the slots 20 with the tabs 18A first. However, it is initially spaced from the wall 22 of the base part 12 by a distance a. 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 past the protruding interference contour of the already installed side wall in the transverse direction Q to form the positive grip. The side wall 16 with the long tabs 18A is then completely inserted into the base part 12 and folded up into the vertical final assembly position.

However, such an assembly or disassembly sequence is not mandatory. Other sequences are also possible with the tabs shown.

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 in FIG 8 is hidden. As can be seen at first, a respective side wall 16A, 16B, 16C each has tabs 18A, 18B, 18C of the same type. In the exemplary embodiment it is provided that the two side walls 16A and 16B, which adjoin one another at the corner, each have different types of tabs 18A, 18B.

How based FIG 8 can also be seen, the further front or rear side part 16C, which is designed as a grid and delimits the evaporator space 4B, is designed with conventional, simple tabs 18C, which 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 can escape more easily in the event of an explosion in this side wall 16C.

In the event of damage, i.e. an explosion, the fastening of the side walls 16A, 16B to the upper area, i.e. in particular to the cover part 14, is released due to the resulting pressure, especially within the compressor space 4A, and the respective side wall 16A, 16B can be rotated about the pivot axis A Fold down to the side and rest on the floor, for example, as shown in FIG 1 is illustrated by the arrow.

Due to the special design of the tabs 18A, 18B, a reliable positive lock is formed, which on the one hand enables the side walls 16 to be folded down to the side and at the same time prevents the side walls 16 from being thrown into the environment due to the explosion pressure.

Reference symbol list

2

Heat pump

4

System housing

4A

Compressor room

4B

Evaporator room

6

compressor

8th

Fan

10

partition wall

12

bottom part

14

Lid part

16, 16A-D

side walls

18

tabs

18A

long tab

18B

short tab

18C

normal tab

20

slot

22

wall

24

Initial area

26

obliquely oriented area (intermediate area)

28

End area

30A

first arch area

30B

second arch area

32

recess

Q

Transverse direction

v

Vertical direction

5

Plugging direction

L

Slot direction

T

depth

a

Distance

A

Pivot axis

Claims (14)

Refrigerant system (2), in particular a heat pump, with an explosion-proof system housing (4), which has a plurality of side walls (16) and a base part, at least some of the side walls (16, 16A, 16B) having at least one on a respective side wall (16). molded tab (18, 18A, 18B) is connected to the base part (12), the base part (12) having 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) can be inserted in a plug-in direction (S), the tab (18, 18A, 18B) being transverse to the plug-in direction (S) and thus in Has a recess (32) running in the slot direction (L), so that by moving the tab (18, 18A, 18B) laterally relative to the slot (20), the tab (18, 18A, 18B) has a positive engagement with the slot (20 ) delimiting wall (22). Refrigerant system (2) according to the preceding claim, in which the side walls (16) are connected at their end opposite the base part (12) to a further housing part via a second type of connection, the second type of connection having a lower holding force than the connection of the side walls (16 ) with the base part (12). Refrigerant system (2) according to one of the preceding claims, in which the tab (18, 18A, 18B) has a region (26) which is oriented obliquely with respect to the plug-in direction (S). Refrigerant system (2) 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). Refrigerant system (2) according to one of the preceding claims, in which the tab (18, 18A, 18B) is designed such that an intermediate mounting position is possible in which the lateral displacement to form the positive rear grip can already take place, but the side wall (16, 16A, 16B) is still in a folded down position, from which it can be folded up into an end assembly position when the rear grip is formed. Refrigerant system (2) according to one of the preceding claims, in which the recess (32) has a depth extending transversely to the slot direction (L), which allows the side wall (16, 16A, 16B) to be displaced by a distance (a) from the Base part (12) allowed to form the positive rear grip. Refrigerant system (2) according to the preceding claim, in which the distance (a) is greater than 0.5cm, in particular greater than 1cm and in particular greater than a thickness of the side wall (16). Refrigerant system (2) according to one of the preceding claims, in which the tabs (18, 18A, 18B) of side walls (16, 16A, 16B) adjacent to one another at corners are of different lengths. Refrigerant system (2) according to one of the preceding claims and according to claim 3, in which the tab (18, 18A, 18B) has an end region (28) bent towards this in addition to the obliquely oriented region (26). Refrigerant system (2) 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 insertion direction (S) and which extends obliquely over a first arc region (30A). oriented area (26). Refrigerant system (2) according to the two preceding claims, in which the obliquely oriented region (26) merges into the end region (28) via a second curved region (30B), the two curved regions (30A, 30B) being curved in opposite directions. Refrigerant system (2) according to one of claims 9 to 12, in which the end region (28) extends in the plug-in direction (S). Refrigerant system (2) 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), the side walls (16) preferably extending over Support the tabs (18, 18A, 18B) on the base part (12). System housing (4) for a refrigerant system (2) according to one of the preceding claims, which has a plurality of side walls (16) and a base part, at least some of the side walls (16, 16A, 16B) being connected via at least one to a respective side wall (16, 16A, 16B) molded tab (18, 18A, 18B) is connected to the base part (12), the base part (12) having 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) can be inserted in a plug-in direction (S), the tab (18, 18A, 18B) being transverse to the plug-in direction (S ) and thus has a recess (32) running in the slot direction (L), so that by moving the tab (18, 18A, 18B) laterally relative to the slot (20), the tab (18, 18A, 18B) has a positive engagement with the forms the wall (22) delimiting the slot (20).

Images