DE102017110541A1 - Air conditioning compressor and refrigerant circuit with such an air compressor - Google Patents

Abstract

The present invention relates to an air conditioning compressor (2). This comprises a low-pressure section (10) with a suction inlet (11) for drawing refrigerant into the air-conditioning compressor (2), a high-pressure section (12) with a high-pressure outlet (13, 14, 35) for discharging compressed refrigerant from the air-conditioning compressor (2). out and between the low pressure section (10) and the high pressure section (12) arranged compressor drive (15) for compressing sucked refrigerant. The air-conditioning compressor (2) is characterized in that the high-pressure outlet (13, 14, 35) comprises a first outlet port (13) and a second outlet port (14), which are connectable to each separate connecting leads (25, 26), and a Switching device (16) is provided, by means of which at least two switching positions are made possible. In this case, in a first switching position, the first outlet port (13) and the high-pressure section (12) can be connected and the second outlet port (14) and the high-pressure section (12) can be separated from one another, and the second outlet port (14) and the second outlet port (14) are in a second switching position High pressure section (12) connectable and the first outlet port (13) and the high pressure section (12) separable from each other.

Description

The present invention relates to an air conditioning compressor, an air compressor assembly and a refrigerant circuit with such an air compressor, in particular for use in a motor vehicle.

An air conditioning compressor, also called a refrigerant compressor, ensures the compression of the refrigerant in the circuit of an air conditioning system. Air compressors are long known and in different designs, such as swash plate compressors, reciprocating compressors or scroll compressors. Regardless of the particular type, air conditioning compressors have in common that they have a low pressure section with a suction inlet, a high pressure section with a high pressure outlet and a compressor drive disposed therebetween. Refrigerant sucked in via the suction inlet thus enters the air-conditioning compressor, is fed to the compressor engine and compressed there, and then discharged in a compressed manner via the high-pressure outlet from the high-pressure section.

Refrigerant circuits must be configured in different ways depending on the operating mode. In order to enable a plurality of operating modes (in particular a cooling operation and a heating operation) with a refrigerant circuit, there are requirements for the refrigerant circuit and its interconnection options. This may possibly also result in different requirements for the air compressor.

It is the object of the present invention to facilitate the configuration of refrigerant circuits for different operating modes, or to create conditions such that different configuration requirements of the refrigerant circuit can be met flexibly and inexpensively.

This object is achieved by an air compressor with the features of claim 1 and a refrigerant circuit with the features of claim 9. Advantageous training and further developments emerge from the dependent claims.

The air conditioning compressor according to the invention is characterized in that the high-pressure outlet comprises a first and a second outlet port, which are connectable to each separate connecting lines. Further, a switching device is provided, by means of which at least two switching positions are made possible, in a first switching position of the first outlet port and the high pressure section connectable and the second outlet port and the high pressure section are separated from each other, and in a second switching position of the second outlet port and the high pressure section connectable and the first outlet port and the high pressure section are separable from each other. This makes it possible to provide the optional connectivity of two components integrated with the high pressure section in the compressor. This is particularly advantageous when switching between a heating operation (also known as heat pump operation) and a cooling operation (also known as AC operation), because then a line arrangement with a separate 3-way valve can be dispensed with. On the special configuration options will be discussed below with reference to the refrigerant circuit and the embodiments in more detail.

According to embodiments of the invention it is provided that in the first switching position of the second outlet port is completely closed. Further, alternatively or additionally, a connecting channel may be provided to the low-pressure section, which is connectable in the second switching position with the first outlet port. This has advantages for such configurations in which the first outlet port is connected to a portion of the refrigerant circuit which is to be selectively switchable to the high pressure region of the refrigerant circuit and optionally inactive. In this way, accumulated in the inactive switched section refrigerant can escape via the connecting channel in the low-pressure section. Even with not quite tight check valves thus refrigerant is always sucked out of the inactive section. An accumulation of possibly still hot refrigerant and associated thermal disadvantages in a connected but temporarily inactive switched heat exchanger is thus avoided.

The connecting channel can be configured as desired. For the suction effect in the low pressure section, a considerably smaller flow cross section is sufficient compared to the first outlet port. This can then be designed, for example, to save space in the housing of the air compressor as a capillary, puncturing or throttle point between the high pressure section and the low pressure section.

According to a development, the high-pressure outlet comprises a third outlet connection, wherein in a third switching position the first outlet connection can be connected to the high-pressure section and the second and third outlet connections can be short-circuited with one another without connection to the high-pressure section. This can be without additional multi-way valves a mixed operation (also known as re-heat operation, in which for the air conditioning both cold air in the evaporator and hot air in the heating heat exchanger are generated) under configure partial bypass of the outdoor heat exchanger when the outdoor heat exchanger is connected to the second outlet port.

According to one embodiment of the invention, the switching device has a displaceably and / or rotatably mounted closing member, by means of which at least two different switching positions can be switched. In this case, the actuator may be formed in particular cylindrical or plate-shaped. Such trained actuator can be easily operated and integrated into the wall of the housing of the air compressor.

According to a further aspect of the invention it is provided that the change in the switching position of the closing member is supported by the pressure difference between the low pressure section and the high pressure section. For this purpose, surface portions of the actuator via passages with the high pressure and the low pressure section are connected such that an adjusting movement is performed hydraulically by the pressure difference. For example, the opposite ends of the actuator are subjected to different pressure, so that there is an actuating movement. Such servo valves are known per se, but can be realized in this context particularly space-saving.

According to the invention, an air conditioning compressor arrangement is equipped with a previously mentioned air conditioning compressor and an associated control unit for controlling the air conditioning compressor. It is provided that the control unit is set up to additionally control the switching device. In particular, it can switch between two different switching positions. Realizing the switching process on the same control unit for controlling the air conditioning compressor has the advantage that control lines and a controller for the valve can be saved since the valve for communication with the vehicle electronics (for example via CAN bus) can use the existing controller of the air conditioning compressor. In addition, possibly synchronized with the switching process to be adapted control signals for the air compressor are easily matched.

In particular, if necessary, the compressor for the switching time exactly tuned down or briefly stopped completely.

According to the invention, a refrigerant circuit comprises a previously mentioned air conditioning compressor or a previously mentioned air conditioning compressor arrangement, a first high-pressure heat exchanger which is suitable for a heating function for an air conditioner, and a second high-pressure heat exchanger which is suitable for arrangement as an exterior heat exchanger. In this case, the refrigerant circuit is configured such that the first high-pressure heat exchanger are connected via a first connecting line to the first outlet port and the second high-pressure heat exchanger via a second connecting line to the second outlet port. The first heat exchanger is typically suitable for direct placement in an air conditioner. Alternatively, the first heat exchanger is provided as a heat source for a water-based secondary circuit, in which case a further, water-based heat exchanger is provided in a secondary circuit for arrangement in the air conditioner.

According to one embodiment of the invention, the third outlet port is connected via a third connecting line to an expansion element, which is connected downstream with an evaporator. This configuration is advantageous for a previously mentioned re-heat operation and saves here, if necessary, further valve arrangements.

• Die 1 zeigt schematisch einen Kältemittelkreis, welcher gemäß dem Stand der Technik für einen Wärmepumpenbetrieb und einen Kühlbetrieb geeignet ist,
• die 2 zeigt schematisch einen Klimakompressor gemäß einem ersten Ausführungsbeispiel der Erfindung,
• die 3 zeigt schematisch eine Schalteinrichtung für zwei Schaltstellungen eines Klimakompressors, welche für einen Klimakompressor gemäß dem ersten Ausführungsbeispiel verwendbar ist,
• die 4 zeigt schematisch eine Konfiguration eines Kältemittelkreisabschnitts mit einem Klimakompressor gemäß dem ersten Ausführungsbeispiel,
• die 5 und 6 zeigen schematisch weitere Schalteinrichtung für zwei Schaltstellungen eines Klimakompressors,
• die 7 zeigt schematisch eine Konfiguration eines Kältemittelkreises mit einem Klimakompressor gemäß einem zweiten Ausführungsbeispiel der Erfindung,
• die 8 und 9 zeigen schematisch weitere Schalteinrichtung für drei Schaltstellungen eines Klimakompressors, welche für einen Klimakompressor gemäß dem zweiten Ausführungsbeispiel verwendbar sind.

The invention will now be explained in more detail with reference to embodiments and with reference to the figures.

• The 1 shows schematically a refrigerant circuit, which is suitable according to the prior art for a heat pump operation and a cooling operation,
• the 2 shows schematically an air conditioning compressor according to a first embodiment of the invention,
• the 3 shows schematically a switching device for two switching positions of an air conditioning compressor, which is usable for an air conditioning compressor according to the first embodiment,
• the 4 FIG. 12 schematically shows a configuration of a refrigerant cycle portion including an air conditioning compressor according to the first embodiment; FIG.
• the 5 and 6 show schematically another switching device for two switching positions of an air conditioning compressor,
• the 7 1 schematically shows a configuration of a refrigerant circuit including an air compressor according to a second embodiment of the invention;
• the 8th and 9 schematically show another switching device for three switching positions of an air compressor, which are used for an air compressor according to the second embodiment.

The embodiments illustrated below relate to the application of Invention on motor vehicles. In general, the invention can also be applied in other areas of air conditioning technology.

In the 1 is a schematic diagram of a refrigerant circuit 1 which is suitable according to the prior art for a heat pump operation and a cooling operation. An air conditioning compressor 2 drives refrigerant flowing in the circuit by sucking, compressing and expelling the refrigerant under high pressure. Downstream of the air conditioning compressor 2 is a first high-pressure heat exchanger 3 arranged, which is called depending on the refrigerant as a condenser or gas cooler. About the high pressure heat exchanger 3 Heat is given off to a thermally conductive contact medium. The high pressure heat exchanger 3 acts here as a heat source for heating the passenger compartment of a motor vehicle.

The high pressure heat exchanger may be a refrigerant air heat exchanger, which is directly in the air duct 6 the vehicle air conditioning is arranged. Alternatively, the high-pressure heat exchanger may also be a refrigerant-water heat exchanger, which forwards the heat generated via a secondary circuit to a water-air heat exchanger, which then instead in the air duct 6 is arranged (not shown). The following is the high-pressure heat exchanger 3 acting as a capacitor 3 referred to, but without being limited to the specific embodiment variant.

Downstream of the condenser 3 are an outdoor heat exchanger 4 , an evaporator 5 , at least one expansion valve 7 and possibly other facilities, such as check valves 8th arranged. Typically there is an expansion valve 7A on a connecting line between the capacitor 3 and outdoor heat exchanger 4 to heat pump operation the outdoor heat exchanger 4 to be able to work as an evaporator in the low pressure range. To also allow a cooling operation, the refrigerant circuit 1 also be configured and switchable that the outdoor heat exchanger 4 also works in the high pressure area as a condenser and thus gives off heat to the outside. Typically, there is another expansion valve 7B downstream from the outdoor heat exchanger 4 and upstream of an evaporator 5 intended. The evaporator 5 typically also lies in the air duct 6 the automobile air conditioner. As is known to those skilled in the art, many different configurations of the refrigerant circuit are conceivable. As an example, other facilities are shown, such as two shut-off valves 8A . 8B , an inner heat exchanger 9A and an accumulator 9B , Furthermore, could in the refrigerant circuit 1 further heat exchanger, eg for a battery cooling (a so-called chiller) vorgehsehen his (not shown). On a special aspect of the configuration of the refrigerant circuit 1 will be discussed in more detail below, as far as this is relevant to the present invention.

In the refrigerant circuit shown by way of example 1 can be switched in a conventional manner between different modes. A cooling operation is achieved by the expansion valve 7A completely open and the expansion valve 7B is throttled. In addition, the shut-off valves 8A . 8B closed. In this way, the outdoor heat exchanger works 4 in the high pressure area. Downstream, the refrigerant passes through the high pressure side of the internal heat exchanger 9A and the expansion valve 7B and gets into the evaporator 5 from where it continues on the accumulator 9B and the low pressure side of the internal heat exchanger 9A back to the suction side of the compressor 2 arrives.

In heat pump mode, the expansion valve becomes 7A throttled and the expansion valve 7B closed. In addition, the shut-off valve 8A opened and the shut-off valve 8B closed. In this way, the outdoor heat exchanger works 4 in the low pressure range. The line section around the evaporator 5 is inactive and the refrigerant flows through the accumulator 9B back to the suction side of the compressor 2 ,

In re-heat operation, the expansion valve 7A opened and the expansion valve 7B throttled. In addition, the shut-off valve 8A closed and the shut-off valve 8B open. In this way, both the capacitor 3 as well as the evaporator 5 flow through the refrigerant, because the mass flow of the refrigerant downstream of the condenser 3 due to the opened shut-off valve 8B divides.

In the 2 is schematically an air conditioning compressor 2 illustrated according to a first embodiment of the invention. There are, for example, swash plate compressors, reciprocating compressors or scroll compressors known here as air conditioning compressor 2 Application can be found. The air conditioning compressor 2 includes a low pressure section regardless of its specific design 10 with a suction inlet 11 for sucking refrigerant into the air conditioning compressor 2 and a high pressure section 12 with a high pressure outlet for discharging compressed refrigerant from the air conditioning compressor 2 out. Between the low pressure section 10 and the high pressure section 12 is a compressor engine 15 arranged for compressing sucked refrigerant. The compressor engine 15 has for this purpose compression means, for example in the form of compressible pistons, blade assemblies, compressor scrolls or the like and is typically powered by a motor. An electric air conditioning compressor then includes an electric motor, while in motor vehicles of the air compressor can be driven via the engine of the motor vehicle. Depending on the design of the air conditioning compressor 2 is the compressor engine 15 designed very differently, but below not essential, which is why a more detailed description is omitted. The air conditioning compressor 2 typically includes integrated in the housing a control unit 17 which can be connected via electrical lines and by means of which the air conditioning compressor 2 is controlled.

According to the first embodiment, the high-pressure outlet has a first outlet port 13 and a second outlet port 14 on. Both outlet connections 13 . 14 can be connected to each other with separate connection lines, so that different components in the refrigerant circuit, depending on the switching position 1 can be acted upon with high pressure refrigerant. For this purpose, a switching device 16 provided, by means of which two switching positions are made possible. According to the first embodiment, the control unit 17 set up so that over it the switching device 16 can be controlled, ie that switching between two different switching positions via the control unit 17 is possible.

Referring to 3 the switching device according to the first embodiment is shown schematically in detail. By means of this two switching positions are possible. The switching device 16 has two closure member sections 18 . 19 on which via a connecting rod 21 connected together and via an actuator 20 in the longitudinal direction of the connecting rod 21 can be moved. The actuator 20 is, for example, a controllable electromagnet with a cylindrical cavity. Depending on the wiring of the electromagnet, the end piece of the connecting rod 21 pulled or ejected into the cylindrical cavity, thereby resulting in two switching positions.

In a first switching position blocked the second closing member section 19 the connection between the low pressure section 10 and the first outlet port 13 , which in turn but then with the high pressure section 12 connected is. The compressed refrigerant may then pass through the high pressure passage thus formed 24 through the first outlet port 13 in a (not shown) connected high-pressure line escape, as shown in the 3 (a) is shown. The second outlet port 14 and the high pressure section 12 are separated from each other in this switching position. In this switching position blocked the first closing member section 18 the second outlet port 14 complete, ie this is not connected to any other line.

In a second switching position, the two closing member sections 18 . 19 moved to the left. This will be the second outlet port 14 and the high pressure section 12 connected to each other, so that the compressed refrigerant then via the high-pressure passage thus formed 22 through the second outlet port 14 in the thus connected (not shown) connected high-pressure line can escape, as shown in the 3 (b) is shown. The first outlet connection 13 and the high pressure section 12 are separated by this switching position, because the second closing member section 19 the high pressure passage 24 blocked. The displacement creates a suction passage 23 , which has a connection channel between the first outlet port 13 and the low pressure section 10 provides.

A first application for configuring a refrigerant circuit with an air conditioning compressor 2 according to the first embodiment is shown schematically in the 4 shown. In a refrigerant circuit section is schematically the air conditioning compressor 2 indicated in which the first outlet port 13 with a first connecting cable 25 and the second outlet port 14 with a second connecting cable 26 connected is. In the first switching position according to 3 (a) becomes the first outlet port 13 over the first connection line 25 with the in the air duct 6 the air conditioner arranged capacitor 3 connected. This is then flowed through with hot gas and serves in this switching position as a heating heat exchanger. (Upstream is still the evaporator 5 indicated, whose connection to the refrigerant circuit is not shown.) In the second switching position according to 3 (b) becomes the second outlet port 14 over the second connecting line 26 bypassing the condenser 3 connected to the further downstream portion of the refrigerant circuit. To return the refrigerant to the condenser 3 Preventing is near the output of the capacitor 3 a check valve 8th arranged.

In the second switching position is now achieved that on the suction passage 23 the capacitor 3 with the low pressure section 10 of the air conditioning compressor 2 communicated. This has two advantages. First, when the heating function of the capacitor 3 temporarily is not needed, for example, when switching from a heating mode to a cooling mode, hot gas from the condenser 3 aspirated. This will cause unwanted heating of the evaporator 5 cooled air flow reduced when this near the capacitor 3 flows past. Second is by a possibly not very tight check valve 8th Backflowing refrigerant and oil immediately back to the low pressure section 10 returned, held in the condenser 3 accumulate and thus the circulation no longer available.

In other words, with the use of an air conditioning compressor according to the invention 2 according to the first embodiment allows, without additional valves, the capacitor 3 off. This is an undesirable warming up of the cold air, which is the output side of the evaporator in the cooling mode 5 is provided on the further downstream condenser 3 reduced. The valve function is thus integrated in the air conditioning compressor 2 provided. Furthermore, the following problem can be counteracted effectively and cost-effectively: In the cooling mode, the capacitor can 3 Accumulate refrigerant and oil and / or in the condenser 3 can residual refrigerant through the cold air flow in the air duct 6 condense and possibly through a slightly leaking check valve 8th lick. Both are mitigated by the fact that integrally in the air conditioning compressor 2 provided switching device 16 a circuit such that in the capacitor 3 remaining refrigerant continuously in the low pressure section 10 is sucked off.

In the 5 and 6 schematically further switching devices for two switching positions of an air compressor according to alternative embodiments are shown. The features shown there are exemplary and can be replaced by the aforementioned features of the switching device according to the first embodiment or combine with them.

The switching device 16 according to 5 has a rotatably mounted, cylindrical closing member 27 on. This has two aligned perpendicular to the cylinder axis bores 28 . 29 on, which are rotated by 90 ° and arranged laterally offset from one another. The first hole 28 is at a suitable angle of rotation to form a high-pressure passage 22 for connecting the second outlet port 14 with the high pressure section 12 of the air conditioning compressor 2 bringable, like this in 5 (a) is shown. This corresponds to the second switching position. The cylinder cross section of the closing member 27 along the high-pressure passage 22 is related to 5 (b) shown. The second hole 29 is at a suitable angle of rotation to form a high-pressure passage 24 for connecting the first outlet port 13 with the high pressure section 12 of the air conditioning compressor 2 bringable, like this in 5 (c) is shown. This corresponds to the first switching position.

Furthermore, the closing member 27 another oblique hole 30 whose axis is approximately in the same plane as the axis of the first hole 27 lies. The oblique bore may preferably be opposite the bores 28 . 29 have significantly smaller cross-section. In the second switching position is the first outlet port 13 over the oblique hole 30 with the low pressure section 10 connectable, so that a suction passage 23 formed.

As will be readily apparent to those skilled in the art, this embodiment of the switching device has similar characteristics as the switching device according to the first embodiment of the invention 3 on. In particular, it can thus be with reference to the 4 shown achieve two switch positions and the associated advantages.

The switching device 16 according to 6 has a slidably mounted closure member 31 on, which at both ends between two Vorspannfedern 32 is clamped. Depending on the switching position, the first outlet port 13 (please refer 6 (b) ) or the second outlet port 14 (please refer 6 (a) ) with the high pressure section 12 connected in principle, as in the embodiments with reference to the 3 and 5 has already been explained. About the servo fluid passages 33 can be the ends of the closing member 31 be subjected to the high-pressure refrigerant. Furthermore, by opening the valve 34 the right end of the closing member 31 also optionally with the low-pressure section 10 be connected fluid dynamically. In this way, the change in the switching position can be supported via this servo drive. When opening the valve 34 lies on the left end face of the closing member 31 high pressure and on the right end face of the closing member 31 low pressure on. This causes a displacement of the closing member 31 to the right and gives the second switching position ( 6a ). When closing the valve 34 the connection becomes the low pressure area 10 interrupted. This can be done via the servo fluid passage 33 the now closed back space right of the closing member 31 and the first outlet port 13 be filled with high pressure refrigerant. This causes a displacement of the closing member 31 to the left in the first switching position ( 6b ). This can be achieved by a certain pressure drop between the first outlet connection, which is now pressurized with high-pressure refrigerant 13 and the second outlet port 14 , which is subjected to slightly lower pressure, are still supported.

In the 7 schematically is a configuration of a refrigerant circuit 1 with an air conditioning compressor 2 illustrated according to a second embodiment of the invention. The air conditioning compressor 2 is on the output side with three connecting cables 25 . 26 and 26'connected. The connection lines 25 . 26 correspond to the reference to the 4 shown configuration. The connection line 26 ' is right with the front of the evaporator 5 arranged expansion valve 7 ( 7B , see. 1 ) with the low pressure section of the refrigerant circuit 1 connectable. The remaining part of the refrigerant circuit 1 corresponds essentially to the refrigerant circuit, which with respect to the 1 has already been explained.

The associated air conditioning compressor 2 has a high pressure outlet with a third outlet port 35 on how related to that 8 (a) - 8 (c) will be explained in more detail below. The third outlet connection 35 is then to the third connection line 26 ' connected.

In the first switching position according to 8 (a) is the first outlet port 13 with the high pressure area 12 connected and the second outlet port 14 blocked. In the second switching position according to 8 (c) is the second outlet port 14 with the high pressure area 12 connected and the first outlet port 13 with the low pressure section 10 connected. This corresponds to the outlet connections 13 . 14 concerning the first and second switching positions which have already been discussed for the previous embodiments. In both switching positions, the third outlet port 35 blocked.
in a third switching position according to 8 (b) is now the first outlet port 13 with the high pressure section 12 connected as this is the first outlet port 13 corresponds to the first switching position. The second outlet port 14 and third outlet port 35 However, in this third switch position now without connection to the high pressure section 12 shorted together. This provides a branch point at which the from the condenser 3 flowing high pressure refrigerant partially the outdoor heat exchanger 4 and partly the evaporator 5 is supplied, as is desirable in a so-called re-heat operation for dehumidifying the air.

In other words, in addition to the advantages associated with the air conditioning compressor according to the invention 2 were named after the first embodiment - with the use of an air conditioning compressor according to the invention 2 According to the second embodiment allows to switch without additional valves in a re-heat operation.

In the 9 is schematically another switching device 16 for three switch positions, as for the configuration according to 7 is usable. The switching device 16 comprises a plate-shaped turntable closure member 36 comprising a stationary and a rotatably mounted portion, which about an axis along the plane perpendicular to the plane of the high-pressure opening 39 are rotatable against each other. The turntable closing element 36 can be made of steel or ceramic, for example. Between the stationary and the rotatably mounted portion, a suitable lubricant can be used.

On the stationary held section has the turntable closure member 36 next to the centrally located high-pressure opening 39 still the three outlet connections 13 . 14 and 35 as well as a suction opening 40 on which about 90 ° offset from each other and from the central high-pressure opening 39 spaced apart. The rotatably mounted portion of the turntable closing member 36 hides the fixed section. The rotatably mounted section has recesses for the contact surface with the stationary section 37 . 38 on. A first recess 37 is offset from the axis of rotation and oblong, while the second recess 38 is formed approximately triangular, with a corner in the pivot point of the high-pressure opening 39 covered. This allows various switch positions with selectively formable passages, which are explained in more detail below.

In a first switching position according to 9 (a) covers the second recess 38 the first outlet port 13 and the high pressure port 39 , This allows the formation of a high-pressure passage, as this functionally corresponds to the first switching position according to the previous embodiments.

In the second switching position according to 9 (b) covers the second recess 38 the second outlet port 13 and the high pressure port 39 , It also covers the first recess 37 the first outlet port 13 and the suction opening 40 , This allows the formation of a high-pressure passage and a suction passage, as this functionally corresponds to the second switching position according to the previous embodiments.

In the third shift position according to 9 (c) covers the second recess 38 the first outlet port 13 and the high pressure port 39 , It also covers the first recess 37 the second outlet port 14 and the third outlet port 35 , This allows the formation of a high-pressure passage and a short-circuit passage (between the second exhaust port 14 and third outlet port 35 ), as this function of the third switching position according to the embodiments according to 7 and 8th equivalent.

LIST OF REFERENCE NUMBERS

1

Refrigerant circuit

2

compressor

3

Condenser / gas cooler

4

Outdoor heat exchanger

5

Evaporator

6

air duct

7

expansion valves

8th

check valves

8A, 8B

Shut-off valves

9A

Inner heat exchanger

9B

accumulator

10

Low pressure section

11

suction inlet

12

High pressure section

13, 14

exhaust ports

15

Compressor engine

16

switching device

17

control unit

18, 19

Closing member sections

20

actuator

21

connecting rod

22, 24

High-pressure passage

23

suction passage

25, 26

first and second connection line

27

closing member

28 - 30

drilling

31

closing member

32

bias springs

33

Servo fluid passages

34

Valve

35

third outlet connection

36

Turntable-closing member

37.38

recesses

39

High pressure port

40

suction opening

Claims (10)

An air compressor (2) comprising - a low pressure section (10) having a suction inlet (11) for drawing refrigerant into the air conditioning compressor (2), - a high pressure section (12) having a high pressure outlet (13, 14, 35) for discharging compressed refrigerant the air conditioning compressor (2) out and - between the low pressure section (10) and the high pressure section (12) arranged compressor drive (15) for compressing sucked refrigerant, characterized in that - the high pressure outlet (13, 14, 35) has a first outlet port ( 13) and a second outlet port (14), which are connectable to respectively separate connecting leads (25, 26), and - a switching device (16) is provided, by means of which at least two switching positions are made possible, - wherein in a first switching position of first outlet port (13) and the high pressure section (12) connectable and the second outlet port (14) and the high pressure section (1 2) are separable from each other, and in a second switching position, the second outlet port (14) and the high pressure section (12) connectable and the first outlet port (13) and the high pressure section (12) are separable from each other. Air conditioning compressor (2) after Claim 1 , characterized in that in the first switching position of the second outlet port (14) is completely closed. Air conditioning compressor (2) after one of Claims 1 or 2 , characterized in that a connecting channel (23, 30, 37, 40) to the low pressure section (10) is provided, which in the second switching position with the first outlet port (13) is connectable. Air compressor (2) according to one of the preceding claims, characterized in that - the high pressure outlet (13, 14, 35) comprises a third outlet port (35) and - in a third switching position, the first outlet port (13) with the high pressure section (12) connectable and the second outlet port (14) and third outlet port (35) can be shorted together without connection to the high pressure section (12). Air compressor (2) according to one of the preceding claims, characterized in that the switching device (16) has a displaceably and / or rotatably mounted closing member (18 - 21; 27; 31; 36), by means of which between two different switching positions can be switched. Air conditioning compressor (2) after Claim 5 , characterized in that the actuator (27, 36) is cylindrical or plate-shaped. Air compressor (2) according to one of the preceding claims, characterized in that the change in the switching position of the closing member (31) by the pressure difference between the low pressure section (10) and the high pressure section (12) is supported. Air conditioning compressor arrangement with an air conditioning compressor (2) according to one of Claims 1 - 7 and an associated control unit (17) for controlling the air conditioning compressor (2), characterized in that the control unit (17) is arranged to control the switching device (16), in particular to switch between two different switching positions. Refrigerant circuit (1), comprising an air conditioning compressor (2) according to one of Claims 1 - 7 and / or an air conditioning compressor arrangement Claim 8 , further comprising a first high-pressure heat exchanger (3) suitable for a heating function of an air conditioner, and a second high-pressure heat exchanger (4) suitable for arrangement as an outdoor heat exchanger, characterized in that the first high-pressure heat exchanger (3) is connected via a first connecting pipe (25) to the first outlet port (13) and the second high pressure heat exchanger (4) via a second connecting line (26) to the second outlet port (14) is connected. Refrigerant circuit (1) after Claim 9 , characterized in that the third outlet port (35) via a third connecting line (26 ') with an expansion element (7) is connected.

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