EP2764248A2

EP2764248A2 - Compressor comprising a pressure-relief groove

Info

Publication number: EP2764248A2
Application number: EP12773223.8A
Authority: EP
Inventors: Michael Krug; Jan Hinrichs
Original assignee: Magna Powertrain Bad Homburg GmbH
Current assignee: Magna Powertrain Bad Homburg GmbH
Priority date: 2011-10-05
Filing date: 2012-09-26
Publication date: 2014-08-13
Anticipated expiration: 2032-09-26
Also published as: US9273590B2; US20160176266A1; CN103842653A; WO2013050114A2; DE102011114904A1; EP2764248B1; DE112012004151A5; US20140196683A1; WO2013050114A3; CN103842653B; KR20140105434A; US9744831B2

Abstract

The invention relates to a compressor (10) comprising a pressure chamber (12;13) which is delimited by at least two housing parts (20;30), these housing parts (20;30) comprising sealing surfaces (25;35) that are connected by means of a connection device which applies a contact pressing force between said sealing surfaces (25;35). The compressor is characterised in that at least one groove (40a;40b) extending in a circumferential direction is arranged on at least one sealing surface (25;35), and in that at least one relief opening is arranged on at least one of the housing parts (20;30), this at least one relief opening connecting the groove (40a;40b) to the surroundings (11) of the compressor and emanating from the groove (40a;40b) which extends in the circumferential direction. Said groove (40a;40b) is arranged such that when a predetermined maximum pressure is exceeded in the pressure chamber (13), a pressure-building medium (E) can gather in the groove (40a;40b) and at least partially escape through the relief opening.

Description

107867P469PC 26.09.2012

Compressor with pressure relief groove

The invention relates to a compressor with a pressure chamber which is delimited by at least two housing parts. In particular, the invention relates to such a compressor for use in an air conditioning system of a motor vehicle.

Compressors of this type are known. Your pressure chamber is delimited by at least two housing parts, which are connected by means of a connecting device that applies a contact force between the sealing surfaces.

From DE 102 31 21 1 A1, such a compressor is known in which a plurality of the pressure chamber forming housing parts are screwed together. A screwing of housing parts is a simple and inexpensive way of connecting the pressurized housing parts. However, known compressors are often designed such that they are subjected during operation or in the event of a malfunction with high internal pressures, which makes a generous and space consuming design of the screw to connect the housing parts required to rule out the possibility of unwanted detachment of a housing part ,

From EP 1 297 256 B1 a safety device for compressors is known, which makes it possible to avoid pressures which would overstretch the strength of the connecting device between the housing parts. However, this safety device requires the installation of additional components in the compressor and thus increases the required installation space and weight by itself. The object of the invention is to provide an improved compressor. This object is achieved by a device according to independent claim 1. Preferred developments of this device are the subject of the dependent claims.

The invention according to the independent claim 1 offers the advantage that with a relatively simple safety device, the maximum pressure against which a connecting device must apply a contact force between the housing parts, can be predetermined. This makes it possible to dimension the connecting device smaller than in known compressors under the same conditions of use, whereby cost and space advantages arise.

To solve this problem, a compressor with a pressure chamber is proposed, which is delimited by at least two housing parts and provided or suitable in particular for use in an air conditioning system of a motor vehicle. In this case, the housing parts on sealing surfaces which are connected by means of a connecting device which applies a contact force between the sealing surfaces. In at least one sealing surface of at least one housing part, at least one groove extending in the circumferential direction is arranged. In addition, at least one relief opening is arranged on this at least one housing part, which connects this groove with the surroundings of the housing, the at least one relief opening extending from the circumferentially extending groove, and wherein the groove is arranged so that when a predetermined maximum pressure is exceeded in the pressure chamber, the pressure-building medium, in particular a coolant, collect in the groove and can escape at least partially through the discharge opening.

The invention will be described below with reference to a compressor for use in an air conditioning system of a motor vehicle, in particular in a motor vehicle operated electrically or by hybrid drive. However, the invention is also applicable in an air conditioning system of a motor vehicle with an internal combustion engine. Furthermore, the invention can also be used in air conditioning systems in stationary applications, in particular Buildings, or used for pressurized housing in other applications.

In DE 198 07 691 A1 discloses a compressor with at least two-part housing for an air conditioner of a force vehicle is disclosed, which has a sealing device which is introduced into the surface of a second housing part. In order to avoid compressive forces acting radially outward on a wall region of thinner wall thickness, this sealing device has a groove into which a sealing ring is inserted. The sealing device ensures that the pressure in the pressure chamber can not reach the thinner-walled wall region. For safety, a relief hole is still provided in this wall area, can escape via the reaching under the second wall area coolant to the environment.

A compressor disclosed in this document thus does not have a discharge opening extending from a groove running in the circumferential direction, but merely a relief bore which is spaced from a groove. In a compressor according to the invention, a discharge opening extends directly from a groove extending in the circumferential direction, so that the pressure of the surroundings of the compressor prevails in the entire circumferential groove substantially.

Thus, an inventive compressor compared to the compressor according to DE 198 07 691 A1 has the advantage that, relative to a longitudinal axis of the compressor, axial compressive force between two housing parts can be limited, whereas in a compressor according to DE 198 07 691 A1 only a radial pressure force is avoided. This limitation of the axial pressure force in particular allows a smaller dimensioning of a connecting device between housing parts, without a required minimum contact pressure between the housing parts to maintain a pressure chamber inside the compressor is reached. Furthermore, a compressor according to the invention has the advantage that the groove running in the circumferential direction does not have to have a sealing function, in particular, and thus can be optimized in terms of its function of reducing the pressure.

Under a compressor in the context of the invention is a device to understand, by means of which coolant of an air conditioner, in particular a motor vehicle, compressed - that can be compressed - can be. Such, also called semi-hermetic, compressor preferably has a piston device which is driven by a shaft to compress the coolant. Preferably, this shaft is mounted completely within the housing of the compressor. The piston device is arranged in a housing of the compressor, which has a plurality of housing parts, preferably at least one housing pot and a housing cover. These housing parts delimit a pressure chamber of the compressor. For this purpose, at those areas of the housing parts which touch each other, arranged sealing surfaces which - mediate a connecting device - apply a sufficiently high contact force to each other to demarcate the pressure chamber at normal operating pressure against the environment of the compressor. Preferably, the sealing surfaces are planar.

A pressure chamber in the sense of the invention is to be understood as meaning a volume demarcated by housing parts, within which preferably a piston device of a compressor is mounted. The pressure build-up in the pressure chamber takes place by means of compression of a pressure-building medium, in particular the coolant of the compressor, by the piston means of the compressor.

Under housing parts in the context of the invention, those parts are to be understood that in their entirety form the housing of the compressor, which delimits the pressure chamber from the environment, in particular with regard to the permeability of coolant. Preferably, a compressor housing consists of two or more housing parts. The interfaces of the individual housing parts against each other have sealing surfaces. P2012 / 004039

- 5 -

A sealing surface of a housing part in the sense of the invention is to be understood as meaning a surface of a housing part which adjoins a corresponding sealing surface of another housing part in such a way that a sufficiently large contact pressure between the two sealing surfaces can be applied when connecting the two sealing surfaces by means of a connecting device the pressurized medium in the pressure chamber, preferably the coolant, is prevented from escaping until reaching a maximum pressure predetermined, for example, by the design of the compressor.

In the context of the invention, a connection device is understood to be a device by means of which a contact pressure force can be applied between the sealing surfaces of the housing parts of the compressor. A connecting device preferably has a plurality of connecting elements, through which the application of the contact pressure between the sealing surfaces. Pressurable housings which have housing parts which are connected by releasable connecting elements are referred to as semi-hermetic housings.

In the context of the invention, a contact force between the sealing surfaces of housing parts is to be understood as meaning a force which counteracts the mutual removal of individual housing parts from one another under the influence of the pressurized medium in the pressure chamber. The surface pressure resulting from the contact force generated by the connection device in a sealing surface of the compressor is preferably more than twice the force acting against this surface pressure, which is generated by applying the maximum operating pressure between the connected housing parts. In particular, the contact pressure also causes the pressurized medium, in particular coolant, can not escape between the housing parts.

Under a maximum pressure in the pressure chamber of the compressor is to be understood in the context of the invention, that pressure at whose concerns in the pressure chamber, the connecting means of the compressor is just in a position with a predetermined security, in particular a reserve of contact pressure, a sufficient contact force between Ensure the sealing surfaces of the housing parts. This is necessary to counteract the forces given by the maximum pressure for releasing the connection between the sealing surfaces and thus to prevent pressurized medium, in particular coolant, from escaping until the maximum pressure is reached.

In the sense of the invention, a groove running in the circumferential direction in a sealing surface of a housing part is to be understood as meaning a groove which extends from the sealing surface, preferably the plane of the sealing surface, into the housing part belonging to the sealing surface, wherein the surface area, in which the groove extends, extending in the circumferential direction between an inner, the sealing surface final edge contour and an outer, the sealing surface final edge contour. The groove is designed such that when the maximum pressure is exceeded from the pressure chamber exiting, pressure-building medium in the groove collect and can escape at least partially through a discharge opening. The groove diameter must be designed in such a way that housing parts can not gape up to the groove at maximum operating pressure.

Under a discharge opening in the context of the invention, an opening is to be understood, which establishes a connection from the circumferentially extending groove to the environment of the compressor. The discharge opening is designed as a channel capable of guiding pressure, which has been excluded from housing parts or the connecting device for the purpose of depressurizing, or as a volume which is arranged anyway in recesses for the passage of elements of the connecting device. A relief opening, preferably its radially inner end, starts from the groove extending in the circumferential direction, wherein in the context of the invention "to go out" means that a relief opening is not spaced from the groove, in particular one of the channels or recesses of the relief opening in present sense.

For the purposes of the invention, the environment of the housing means an area which is subjected essentially to atmospheric pressure, preferably an area, which is characterized by the normal ambient conditions in the installation space of an air conditioning system, in particular in a motor vehicle.

Under a pressure, in particular under the action of a pressure near the maximum pressure, the connecting elements of a connecting device of the compressor can expand, wherein the sealing surfaces can gape on their side facing the pressure chamber. The entire pressurized medium remains in the pressure chamber, as long as the pressure does not exceed the maximum pressure. When approaching this maximum pressure increases due to the divergence of the housing parts of the pressurized portion of the sealing surfaces and thus the force acting against the pressing force on the connecting device.

In order to limit the pressurized surface to a defined extent, an inventive, circumferentially extending groove is introduced into at least one sealing surface of a housing part and brought into contact with the environment of the compressor via a discharge opening, so that a pressure relief can take place as soon as the housing parts gape apart their sealing surfaces to the position of the groove according to the invention.

In a particularly preferred embodiment of the compressor according to the invention, the connecting device has a plurality of connecting elements. Preferably, these connecting elements protrude through recesses in the sealing surfaces of the housing parts to be joined. The centers of these recesses are preferably arranged substantially equidistant from that edge contour of the sealing surface, which faces the pressure chamber.

By connecting elements in the context of the invention are to be understood elements by means of which a contact force between the sealing surfaces of different housing parts can be applied. Preferably, the connecting elements are designed as screws or as bolts and protrude through recesses, which are arranged in the sealing surfaces of the housing parts to be joined. In another preferred PT / EP2012 / 004039

- 8th -

According to a development of the invention, the connecting elements are designed, for example, as clamps which are attached to designated and preferably designed coupling regions on the side of the housing parts to be connected to the surroundings. In order to apply the necessary contact force these clamps are preferably formed with corresponding spring properties.

Under recesses in the sealing surfaces of the housing parts to be joined are in the context of the invention recesses to be understood, which extend from the surface of a sealing surface in or through a housing part. Preferably, these recesses are designed as grooves or holes, particularly preferably as through holes or blind holes. In the case of using screws as connecting elements, the recesses may also have an internal thread, which is suitable for screwing with a screw. In the case of using bolts as connecting elements, the recesses may also have fits, which are suitable for pinning a recess with a bolt used.

Further particularly preferred developments of the compressor according to the invention differ from each other in particular in that the at least one groove running in the circumferential direction, with respect to the recesses, and preferably their centers, for the connecting elements, either a consistently larger or a consistently smaller or a substantially identical identical or a variable distance to the housing interior.

In a further particularly preferred embodiment of the compressor according to the invention, the discharge opening is formed by at least one discharge channel in at least one of the sealing surfaces, said discharge channel extending from the circumferentially extending groove to the surroundings of the compressor.

Under a discharge channel in the context of the invention is to be understood a channel which emanates from the groove extending in the circumferential direction in a sealing surface and is suitable, a medium from the pressure chamber, in particular cooling medium, of the in Extend circumferentially extending groove directly or indirectly to the environment. In particular, a discharge from the circumferentially extending groove through the discharge channel to one or more other discharge channels, provided to a recess for a connecting element or other, connected to the environment, volume or directly into the environment of the compressor.

In a further particularly preferred embodiment, the discharge opening is formed by at least one discharge channel in at least one of the sealing surfaces, said discharge channel extending from the groove extending in the circumferential direction to a recess for a connecting element.

For this purpose, in a further particularly preferred development of the compressor according to the invention, it is provided that at least one of the connecting elements is designed and arranged such that the medium accumulated in the groove extending in the circumferential direction can escape into the environment of the compressor. In an embodiment of the connecting device as a screw connection, an escape of the medium through at least one passage recess in at least one housing part and a groove in this housing part, preferably in the direction of the screw head, are preferably provided. When using a fitting, however, is an escape of the medium via a groove in at least one pin used for pinning or in at least one of the recesses of the housing part, which are pinned with bolts.

In a further particularly preferred embodiment of the compressor according to the invention, the discharge opening has at least one discharge channel, which extends from at least one of the recesses for connecting elements, in particular through holes, at least one of the housing parts to the surroundings of the compressor. Such a relief channel is provided in particular when the groove running in the circumferential direction is located at a substantially identical distance to the housing interior as the corresponding through hole, wherein the groove opens into at least one through-hole. In a further preferred development of the compressor according to the invention, at least one sealing element is arranged in the groove extending in the circumferential direction. In this case, the groove is preferably arranged close to the pressure chamber of the compressor.

Under a sealing element according to the invention an element is to be understood, which is provided in the case of entry of pressurized medium into the circumferentially extending groove up to a predetermined maximum pressure to the leakage of the pressurized medium, in particular a coolant, preferably a C0 ₂ -containing coolant or C0 ₂ , to prevent.

Exemplary embodiments of the compressor according to the invention will become apparent from the following descriptions in conjunction with the figures, which show in detail:

1 shows an exemplary embodiment of the sealing surface of a housing part of a compressor according to the invention;

Fig. 2: a compressor according to the prior art at maximum pressure;

3 shows an exemplary embodiment of a compressor according to the invention

Relief groove at operating pressure;

Fig. 4: the exemplary embodiment of the compressor according to the invention with relief groove of Figure 3 at maximum pressure.

Fig. 5: another exemplary embodiment of a compressor according to the invention with relief groove at maximum pressure;

6 shows another exemplary embodiment of a compressor according to the invention with relief groove at maximum pressure;

7a shows the radial pressure curve in the sealing surface between two housing parts of a compressor according to the prior art at operating pressure;

Fig. 7b: the radial pressure curve in the sealing surface between two housing parts of a compressor according to the prior art at maximum pressure; 7 c: the radial pressure curves in the sealing surface between two housing parts of a compressor according to the invention at operating pressure and maximum pressure.

Fig. 1 shows an exemplary embodiment of the sealing surface 25 of a housing 20 of a compressor 10 according to the invention. The sealing surface 25 is planar and bounded by two substantially concentric circles with different radii. In the sealing surface 25, a plurality of recesses of screw holes 21 are arranged, wherein these screw holes 21 extend orthogonally from the sealing surface 25 into the housing 20. The nine in this embodiment of the housing 20 in the region of the sealing surface 25 recessed screw holes 21 are arranged distributed at equal intervals on the circumference of the sealing surface 25. The radial distances of the individual screw holes 21 from the inner edge of the sealing surface are substantially identical. The sealing surface 25 has a groove 40 according to the invention. This groove 40 extends in the circumferential direction of the housing 20 and the sealing surface 25 in a substantially constant radial distance from the inner edge of the sealing surface. In the embodiment described here, the groove 40 extends in the sealing surface 25 in the radial position, in which the screw holes 21 are arranged. As a result, the groove 40 cuts all nine bolt holes 21 of the housing 20 and is thereby interrupted at nine points. The radial width of the groove 40 is small in relation to the radial width of the screw hole 21.

2 shows a compressor 100 according to the prior art with a pressure chamber under maximum pressure 3. This compressor 10 has a housing 20 and a housing cover 30. The housing 20 and the housing cover 30 are connected at their respective sealing surfaces 125 and 135 such that in the interior of the compressor 10, a pressure chamber 13 is formed, wherein in the region of the sealing surfaces 125 and 135, a rubber-metal seal 60 is arranged. The two housing parts 20 and 30 are connected by means of a plurality of housing screws 150, which are guided by screw through holes 32 in the housing cover 30 and screwed into threaded bores 21 in the housing 20. In Fig. 2, the compressor when pressurized with maximum pressure corresponding to the bursting pressure is shown. In this operating state gap through the applied by means of the applied maximum pressure, surface pressure on the inner walls the pressure chamber 13 of the compressor 10, the sealing surfaces of the housing cover 135 and the housing 125 apart. This results in a gap 31 between the two sealing surfaces 135 and 125. Through the opening of this gap 31 can pressurized medium E from the original pressure chamber penetrate into this gap and now there apply a surface pressure against the force applied by the housing screws 150 connecting force. As a result, at maximum pressure, the diameter of the pressurized area in the compressor D _{H increases} . In compressors 10 according to the prior art, it is therefore necessary to dimension the housing screws 150 so large that they withstand the increasing surface pressure while increasing the diameter of the pressurized surface until only at the outer edge D _H s is sealed to a Failure of the screw connection to avoid.

Fig. 3 shows an exemplary embodiment of a compressor 10 according to the invention with relief groove at operating pressure. The exemplary embodiment illustrated here differs from a compressor 10 according to the prior art shown in FIG. 2 by smaller housing screws 50 which, due to the arrangement of grooves 40a and 40b according to the invention, no longer have to be designed as large in the sealing surfaces 35 and 25 The compressor 10 according to the invention in Fig. 3 is shown with a pressurization at operating pressure in the pressure chamber 12, so that the diameter of the pressurized surface at operating pressure D _{B is} smaller than the diameter D shown in FIG _H s, since at operating pressure, the sealing surfaces 35 and 25 of the housing cover 30 and the housing 20 do not gape apart. In detail, the exemplary embodiment of the compressor 10 described here has a groove 40a in the sealing surface 35 of the housing cover 30 and a groove 40b in the sealing surface 25 of the housing 20. These grooves extend in the circumferential direction of the respective sealing surface and extend in the embodiment over its entire circumference. At each position in the circumference of the respective sealing surface, are arranged on the threaded bores 21 and Schraubendurchgangsbohrungen 32 extends in the radial direction, a discharge channel 27 or 37 in the sealing surface of the housing 20 or the housing cover 30. The grooves 40a and 40b are formed such that can accumulate pressurized medium E in them. Likewise, the relief channels 27 and 37 are formed such that 04039

- 13 - they can direct pressurized medium E from the respective groove 40 to the screw through holes 32.

4 shows the exemplary embodiment of the compressor according to the invention from FIG. 3 when the pressure chamber 13 is subjected to maximum pressure. In this operating state, the housing parts 20 and 30 apart in the region of their inner sealing surfaces 25 and 35, so that a gap 31 is formed. Due to the formation of this gap 31, the diameter of the pressurized surface increases to the diameter D _H E. which, however, is smaller than the diameter D _H s of the pressurized surface at maximum pressure in a compressor 10 according to the prior art. At maximum pressure, the gap 31 between the sealing surfaces 25 and 35 opens radially outward to the grooves 40a and 40b, whereupon they fill with pressurized medium E, which is discharged via the discharge channels 27 and 37 to the respective screw through-bore 32 and over this in the environment 1 1 of the compressor 10 can escape. In this case, in particular a groove in the head of those housing screws 50 is provided through the screw through holes 32 pressurized medium is performed. The radial position of the grooves 40a and 40b limits the maximum possible diameter D _H E of the pressurized surface at maximum pressure such that a smaller design of the housing screws 50 is possible because by restricting the diameter D _H E applied by the pressurized medium force to Solution of Schraubverbindungspartner 21, 30 and 50 is also limited.

Fig. 5 shows another exemplary embodiment of a compressor 10 according to the invention with relief groove at maximum pressure. In the embodiment shown here, the discharge of the pressurized medium E from the grooves 40a and 40b also takes place via discharge channels 27 and 37 in the sealing surface 25 of the housing 20 and the sealing surface 35 of the housing cover 30. The relief channels 27 and 37 are, based on the Sealing surfaces, along the grooves 40 a and 40 b, not arranged on the circumferential positions of the housing screws 50, but at circumferential positions between these connecting elements. The discharge channels 27 and 37 extend radially from the grooves 40a and 40b to the outer radial edge of that housing part 20 or 30, from which they are excluded, and thus provide a connection to Environment 1 1 of the compressor at ambient pressure forth, to the pressurized medium E from the pressure chamber of the compressor 13 via the gap 31, the grooves 40a and 40b and the discharge channels 27 and 37 can be removed. In the described embodiment, one or more pairs of relief channels 27 and 37 are provided; Furthermore, one or more relief channels 27 and / or 37 can be provided independently of one another at arbitrary locations in the circumference of the respective sealing surface 25 and / or 35.

Fig. 6 shows a further exemplary embodiment of a compressor according to the invention

10 with relief groove at maximum pressure. The embodiment shown here differs from the embodiments shown in FIGS. 4 and 5 by the arrangement and design of the discharge channels. The embodiment shown in FIG. 6 provides one or more relief channels 27 and / or 37 at the circumferential positions of housing screws 50. The relief channels 27 and / or 37 extend radially from the grooves 40a and 40b to the radial position of the respective screw through bore 32. In addition, one or more relief bores 38 are provided in the housing cover 30 extending radially from a screw through bore 32 to the periphery 1 of FIG Compressor 10 extend. The relief holes 38 are not arranged in the sealing surface of the housing cover, ie on the surface of the housing cover, but completely within the limits of the volume of the housing cover 30. Pressurized medium E, which escapes at maximum pressure from the pressure chamber 13 of the compressor 10, so can collect in the grooves 40a and 40b and is then on the discharge channels 27 and / or 37, via corresponding screw holes 32 and relief holes 38 in the environment 11 of Compressor 10 discharged. If this path of the pressurized medium E to be discharged is to be ensured, the pressure-chamber-remote part of the screw through-holes 32 must be closed impermeable to the pressurized medium beyond the screw-axial position of the relief bore 38 in the housing cover. In this case, the housing cover 30 has one or more partially closed Schraubendurchgangsbohrungen 33.

7a shows a radial pressure curve in the sealing surface between two housing parts of a compressor 10 according to the prior art at operating pressure. The sealing surface 135 the housing cover 30 and the sealing surface 125 of the housing 20 are at operating pressure on each other. The radial pressure curve in the sealing surface at operating pressure G _B s decreases radially from the inside to the outside over the entire sealing surface, the full operating pressure in the pressure chamber 12 abutting the radially inner edge of the sealing surfaces, and the ambient pressure of the environment 1 at the outer radial edge of the sealing surfaces 1 is present.

Fig. 7b shows the radial pressure curve in the sealing surface between two housing parts of a compressor 10 according to the prior art at maximum pressure. When the pressure chamber 13 of the compressor 10 is subjected to maximum pressure, the sealing surface 35 of the housing cover 30 and the sealing surface 25 of the housing 20 gape apart at an acute angle, whereby the gap 31 is formed. As a result, in a radial region of the sealing surfaces from the inner radial edge of the sealing surfaces 125 and 135, close to the outer edge of the sealing surfaces, the full maximum pressure of the pressure chamber 13 bears against the sealing surfaces. Only in the outer radial edge region of the sealing surfaces up to the outer edge of the sealing surfaces of the radial pressure curve G _H s idealized in the sealing surface at maximum pressure a linearly decreasing course up to the environment 1 1 of the compressor 10 under ambient pressure.

Fig. 7c shows the radial pressure curves in the sealing surfaces 25 and 35 between two housing parts 20 and 30 of a compressor 10 according to the invention at operating pressure and maximum pressure. In the embodiment shown here, the sealing surface 25 of the housing 20 and the sealing surface 35 of the housing cover 30 each have a groove 40a or 40b extending in the circumferential direction. The radial pressure curves in the sealing surface at operating pressure G _B E and at maximum pressure G _H E are in contrast to the corresponding pressure curves in a compressor according to the prior art radially to the area between the inner radial edge of the sealing surfaces and the radial position of the grooves 40a and 40b limited. Relative to the radial extent of the sealing surfaces, from the radial position of the grooves 40a and 40b, the ambient pressure of the environment 11 is applied. List of Reference Signs of Compressors According to the Invention

0 compressor according to the prior art

Environment below ambient pressure

Pressure chamber under operating pressure

Pressure chamber under maximum pressure housing

threaded hole

inventive sealing surface of the housing

Sealing surface of the housing according to the prior art relief channel in the sealing surface of the housing housing cover

gap

Bolt through hole

closed screw through hole

inventive sealing surface of the housing cover

5 Sealing surface of the housing cover according to the state of the art Relief channel in the sealing surface of the housing cover Relief bore in the housing cover a Groove in the sealing surface of the housing cover

B groove in the sealing surface of the housing according to the invention housing screw

0 housing screw according to the prior art

Rubber-metal sealing D _B Diameter of the pressurized area at operating pressure

DHS diameter of the pressurized area in a compressor after the

State of the art at maximum pressure

D _H E diameter of the pressurized surface in a compressor according to the invention at maximum pressure

G _B s radial pressure gradient in the sealing surface of a compressor according to the prior

Technology at operating pressure

GBE radial pressure gradient in the sealing surface of a compressor according to the invention at operating pressure

GHS radial pressure gradient in the sealing surface of a compressor according to the prior art at maximum pressure

G _H E radial pressure gradient in the sealing surface of an inventive at maximum ^¬ pressure

E Escaping pressurized medium

Claims

claims

A compressor (10) having a pressure chamber (12; 13) which is delimited by at least two housing parts (20; 30), in particular for use in an air conditioning system of a motor vehicle,

wherein the housing parts (20; 30) have sealing surfaces (25; 35) which are connected by means of a connecting device which applies a contact force between the sealing surfaces (25; 35), characterized in that at least one sealing surface (25; at least one relief opening is arranged on at least one of the housing parts (20, 30) which surrounds the groove (40a, 40b) with the environment (FIG. 1 1) of the compressor, wherein the at least one relief opening extends from the circumferentially extending groove (40a; 40b),

And wherein the groove (40a, 40b) is arranged so that when a predetermined maximum pressure in the pressure chamber (13) pressure-increasing medium (E) in the groove (40a, 40b) collect and at least partially escape through the discharge opening.

2. compressor (10) according to claim 1, characterized in that

the connecting device has a plurality of connecting elements (50).

3. compressor (10) according to claim 2, characterized in that

these connecting elements (50) protrude through recesses (21, 32) in the sealing surfaces (25, 35) of the housing parts (20, 30) to be connected.

4. The compressor (10) according to claim 3, characterized in that these recesses (21; 32) are arranged substantially equidistant from that edge contour of the sealing surface (25; 35) facing the pressure chamber (12; 13).

5. compressor (10) according to claim 4, characterized in that

the circumferentially extending groove (40a; 40b) has a greater or lesser or substantially identical distance to the pressure chamber (12; 13) relative to the recesses (21; 32) for the connecting elements (50).

6. compressor (10) according to claim 4, characterized in that

the circumferentially extending groove (40a; 40b) has a variable distance from the pressure chamber (12; 23) relative to the recesses (21; 32) for the connecting elements (50).

7. compressor (10) according to one of claims 3 to 6, characterized in that the connecting elements (50) of the connecting device are designed as screws or bolts and through through holes (32) in at least one housing part (20; 30) are guided, which into the recesses in the sealing surfaces (25, 35) open.

8. The compressor according to claim 3, wherein the relief opening has at least one relief channel in at least one sealing surface of a housing part, wherein this relief channel is provided (37) extends from the circumferentially extending groove (40a; 40b) to the periphery (11) of the compressor (10).

Compressor (10) according to one of claims 3 to 7, characterized in that the discharge opening has at least one discharge channel (27; 37), this discharge channel (27; 37) extending from the circumferentially extending groove (40a; 40b) to to a recess (21; 32) for a connecting element (50), and wherein pressure-building medium (E) can escape through at least one recess (21; 32) for connecting elements (50).

10. compressor (10) according to any one of claims 8 or 9, characterized in that

at least one relief channel (27; 37) is formed in at least one of the sealing surfaces (25; 35).

1 1. Compressor (10) according to one of claims 2 to 10, characterized in that

at least one of the connecting elements (50) is designed and arranged such that the medium (E) accumulated in the circumferentially extending groove (40a; 40b) can escape into the environment (11) of the compressor (10).

12. compressor (10) according to one of claims 8 to 1 1, characterized in that

the relief opening has at least one relief bore (38) which extends from at least one of the through bores (32) of at least one of the housing parts (20, 30) to the surroundings (11) of the compressor (10), the relief bore (38) of the sealing surface (25; 35) of the housing part (20; 30) is spaced apart.

13. A compressor (10) according to any one of claims 4 or 6 to 12, characterized in that

at least one sealing element is arranged in at least one circumferential groove (40a, 40b).