阅读说明：本技术 用于运行涡旋式压缩机的方法、设备和空调设施 (Method, device and air conditioning system for operating a scroll compressor ) 是由 R·弗鲁斯 于 2020-02-21 设计创作，主要内容包括：本发明涉及一种用于运行空调设施(100)的涡旋式压缩机(110)的方法,其中涡旋式压缩机(110)具有固定的螺旋件(101)和可相对其运动的螺旋件(102),能运动的螺旋件布置在壳体空间(104)中,所述方法包括以下步骤：-预设用于涡旋式压缩机(110)的额定运输质量流,并且如果将额定运输质量流预设得小于涡旋式压缩机(110)的最大运输质量流,-那么减小壳体空间(104)中的能运动的螺旋件(102)的背对固定的螺旋件(101)的侧面(105)上的压力,并且由此-从固定的螺旋件(101)升高能运动的螺旋件(102),用以在能运动的螺旋件(102)和固定的螺旋件(101)之间形成泄漏,并且由此-减小运输质量流。(The invention relates to a method for operating a scroll compressor (110) of an air conditioning system (100), wherein the scroll compressor (110) has a fixed screw part (101) and a screw part (102) that can be moved relative thereto, the movable screw part being arranged in a housing space (104), comprising the following steps: -presetting a rated transport mass flow for the scroll compressor (110) and, if the rated transport mass flow is preset to be smaller than the maximum transport mass flow of the scroll compressor (110), -reducing the pressure on a side (105) of the movable screw (102) in the housing space (104) facing away from the fixed screw (101), and thereby-lifting the movable screw (102) from the fixed screw (101) for forming a leakage between the movable screw (102) and the fixed screw (101), and thereby-reducing the transport mass flow.)

1. Method for operating a scroll compressor (110) of an air conditioning system (100), wherein the scroll compressor (110) has a fixed screw part (101) and a screw part (102) which is movable relative to the fixed screw part and which is arranged in a housing space (104), comprising the following steps:

-presetting a rated transport mass flow for the scroll compressor (110), and if the rated transport mass flow is preset to be smaller than the maximum transport mass flow of the scroll compressor (110):

-then reducing the pressure on the side (105) of the movable screw part (102) facing away from the fixed screw part (101) in the housing space (104), and thereby reducing the pressure on the side (105) of the movable screw part (102) facing away from the fixed screw part (101)

-lifting the movable screw (102) from the fixed screw (101) for creating a leak between the movable screw (102) and the fixed screw (101), and thereby

-reducing the transport mass flow.

2. The method of claim 1, wherein the scroll compressor (110) has a pressure valve (107) coupled with a housing space (104) on an inlet side for controlling a pressure on a side (105) of the movable screw (102) facing away from the fixed screw (101) in the housing space (104), the method comprising:

-reducing the pressure by means of a pressure valve (107).

3. Method according to claim 1 or 2, comprising the step of, if starting from a reduced transport mass flow the transport mass flow should be increased:

-increasing the pressure on the side (105) of the movable screw (102) facing away from the fixed screw (101) in the housing space (104) and thereby,

-moving the movable screw (102) in the direction of the fixed screw (101) for reducing leakage between the movable screw (102) and the fixed screw (101), and thereby

-increasing the transport mass flow.

4. A method according to claim 3, wherein the scroll compressor (110) has a valve (112) which is coupled with a high pressure outlet (109) of the scroll compressor (110) on an inlet side and with a housing space (104) on an outlet side for controlling the pressure on a side (105) of the movable screw (102) facing away from the fixed screw (101) in the housing space (104), the method comprising:

-increasing the pressure by means of a valve (112).

5. The method of claim 3 or 4, wherein the scroll compressor (110) has a throttle valve (111) coupled between a high pressure outlet (109) of the scroll compressor (110) and the housing space (104), the method comprising:

-increasing the pressure by means of pressure compensation through a throttle valve (111).

6. The method according to any one of claims 1 to 5, the method comprising:

-repeating the implementing steps according to a preset nominal transport mass flow.

7. The method of any of claims 1 to 6, the method comprising:

-presetting a leakage time period in which a leakage is formed, according to a preset rated transport mass flow.

8. The method according to any one of claims 1 to 7, wherein the air conditioning installation (100) is configured for a motor vehicle, the method comprising:

-repeating the performing step according to at least one preset operating state of the motor vehicle.

9. Apparatus configured to carry out the method according to any one of claims 1 to 8.

10. An air conditioning facility having:

the device (200) according to claim 9,

-a scroll compressor (100), wherein the apparatus (200) is signally coupled to the scroll compressor (110) for controlling the operation of the scroll compressor (110).

Technical Field

The invention relates to a method for operating a scroll compressor of an air conditioning system, in particular of a motor vehicle. A device designed for carrying out the method is also described. Furthermore, an air conditioning system, in particular of a motor vehicle, having a scroll compressor is specified.

Background

The motor vehicle may be equipped with an air conditioning facility. Air conditioning installations have a compressor (also referred to as a compressor). A refrigerant for a refrigerator is compressed by a compressor.

Disclosure of Invention

It is desirable to describe a method for operating a scroll compressor that enables reliable operation. It is also desirable to describe an apparatus that enables reliable operation of a scroll compressor. It is also desirable to provide an air conditioning system which can be operated reliably.

A method for operating a scroll compressor of an air conditioning system and an apparatus configured to carry out the method are described according to at least one embodiment. Scroll compressors are particularly configured for use in automotive vehicles.

According to an embodiment, a scroll compressor has a fixed screw and a screw movable relative thereto. The movable screw is arranged in the housing space.

The rated transport mass flow for the scroll compressor is preset. If the setpoint transport mass flow is set to be less than the maximum transport mass flow of the scroll compressor, the pressure on the side of the movable screw facing away from the fixed screw is reduced in the housing space. If the nominal transport mass flow is to be smaller or is to be set to be smaller than the maximum transport mass flow of the scroll compressor, the pressure on the side of the movable screw facing away from the fixed screw is reduced in the housing space. Thereby, the movable screw is lifted from the fixed screw. As a result, a leak is formed between the movable screw part and the fixed screw part. Thus reducing the transport mass flow.

Scroll compressors have maximum transport mass flow if the leakage between the movable and fixed scroll is as small as possible. The losses are then as small as possible and the transport mass flow at the outlet of the scroll compressor is maximum. If the maximum transport mass flow is not required during operation, the leakage between the movable screw part and the fixed screw part can be deliberately increased by means of a reduction in the pressure in the housing space if the nominal transport mass flow is less than the maximum transport mass flow. The pressure is reduced, for example, by 0.5 to 5 bar. The value of the reduction is dependent, inter alia, on the refrigerant used, the prevailing process pressure and/or the type of construction of the scroll compressor.

During operation of a scroll compressor, which may also be referred to as a screw compressor or scroll compressor, the movable screw element is pressed axially against the fixed screw element in order to seal the two screw elements from each other when normal operation is desired. The pressure for the pressing must be sufficiently high that the movable screw does not rise undesirably during normal operation. The pressure should also be not too high, since this would result in higher friction and greater wear.

The intentional reduction of the pressure on the side of the movable screw facing away from the fixed screw results in a reduction of the pressing pressure of the movable screw towards the fixed screw. Once the pressure is below a certain lower threshold, the movable screw is lifted from the fixed screw. The pressure on the side of the movable screw part facing away from the fixed screw part is no longer sufficiently great to press the movable screw part against the fixed screw part. The leak is formed by the rise. The transport mass flow of the scroll compressor is reduced. The pressure on the outlet side of the scroll compressor decreases.

The intentional reduction in pressure and associated leakage enables simple and precise power regulation of the scroll compressor. The mass flow transported over a period of time can be effected independently of the drive rotational speed or the means for changing the stroke volume. It is also possible to dispense with an additional actuator, which actively moves the movable screw in the direction of the fixed screw or away from it. The pressure in the housing space causes the movable screw part to move in the direction of the fixed screw part or away from it. Thus, a reverse movement of the two screws is possible by reducing the pressure on the side of the movable screw facing away from the fixed screw.

The transport mass flow can thus be set independently of the rotational speed of the movable screw. For example, it is possible that the drive motor of the scroll compressor can always be operated with the same rotational speed and still achieve different transport mass flows.

According to at least one embodiment, a scroll compressor has a pressure valve. The pressure valve is coupled on the inlet side to the housing space in order to control the pressure on the side of the movable screw part facing away from the fixed screw part in the housing space. The pressure can be reduced by means of a pressure valve. The pressure is reduced, for example, by opening a pressure valve, in order to be able to raise the movable screw part from the fixed screw part. When the scroll compressor is in operation, the pressure in the housing space can be regulated by means of the pressure valve.

According to at least one embodiment, it is possible to increase the transport mass flow of the scroll compressor starting from a reduced transport mass flow. The pressure on the side of the movable screw part facing away from the fixed screw part in the housing space increases. The movable screw part is thereby moved in the direction of the fixed screw part. Thereby reducing leakage between the movable screw element and the fixed screw element. Thereby increasing the transport mass flow. If transport is required again after idle operation, the transport mass flow can be realized simply. For example, closing a pressure valve. For example, the pressure is increased by 0.5 to 5 bar. The value of the increase depends, inter alia, on the refrigerant used, the prevailing process pressure and/or the type of construction of the scroll compressor.

The side of the movable screw part facing away from the fixed screw part in the housing space is connected, for example, to a high-pressure outlet of the scroll compressor. Since even in the case of a leakage of the desired design, a small transport mass flow still exists, the pressure can be applied by means of this connection to the side of the movable screw part facing away from the fixed screw part in the housing space.

According to at least one embodiment, a scroll compressor has a valve. The valve is coupled at an inlet side to a high pressure outlet of the scroll compressor. The valve is coupled on the outlet side to the housing space, in particular to the side of the movable screw facing away from the fixed screw. The pressure on the side of the movable screw part facing away from the fixed screw part in the housing space can be controlled by means of a valve. If the valve is open, the pressure increases. The pressure valve is closed in particular for this purpose.

According to at least one embodiment, the scroll compressor has a throttle valve alternatively or additionally to the valve. A throttle valve is disposed between the high pressure outlet of the scroll compressor and the housing space. The throttle is formed, for example, in the housing of the movable screw and/or the scroll compressor. A plurality of throttle valves and the valve may be provided in common. Alternatively, it is possible to dispense with the valve and to provide only one or more throttles. Pressure compensation between the high-pressure outlet of the scroll compressor and the housing space can be achieved by means of a throttle. Thereby, an increase of the pressure in the housing space is possible, in particular when the pressure valve is closed.

According to at least one embodiment, the method steps are carried out repeatedly according to a predefined setpoint transport mass flow. It is thus possible, in particular over a certain period of time, to achieve a nominal transport quality flow on average. In a certain period of time, the pressure is reduced and the desired leakage can be achieved. In a further period of time, the pressure is increased again and the leakage is reduced. For example, the two states are alternately adjusted at different time intervals in order to achieve a predefined setpoint transport mass flow.

According to at least one embodiment, the air conditioning system is designed as an air conditioning system for a motor vehicle. The steps of the method are repeated according to at least one predefined operating state of the motor vehicle. The operating state of the motor vehicle comprises, for example, the outside temperature, the inside temperature, the pressure of the refrigerant and/or further parameters which are relevant for the operation of the air conditioning system in the motor vehicle.

According to at least one embodiment, an air conditioning installation has a scroll compressor according to at least one embodiment described herein. Air conditioning systems are especially designed for operation in motor vehicles. The air conditioning system is, for example, an air conditioning system of a motor vehicle. An air conditioning installation has a device according to at least one embodiment described herein. The apparatus is signally coupled to the scroll compressor for controlling operation of the scroll compressor. For example, the device is signally coupled to the pressure valve for controlling the pressure valve to regulate the pressure in the housing space. For example, a device is coupled to the valve with signal technology for controlling the valve to regulate the pressure in the housing space. The device controls in particular not only the pressure valve but also the valve in order to reduce or increase the pressure in the housing space as desired.

Drawings

Further advantages, features and extension solutions result from the examples set forth below in connection with the figures.

The figure shows a schematic view of components of an air conditioning installation according to an embodiment.

Detailed Description

Fig. 1 shows a schematic illustration of components of an air conditioning installation 100 according to an embodiment. The air conditioning system 100 is in particular an air conditioning system of a motor vehicle or is designed for use in a motor vehicle.

The air conditioning facility 100 has a scroll compressor 110. A scroll compressor 110 is partially schematically illustrated in the drawings.

The air conditioning facility 100 has an apparatus 200. The device 200 is, for example, an Electronic Control Unit (ECU). The device 200 is, for example, a control device of a motor vehicle, which is designed to control or regulate the air conditioning system 100. To this end, the device 200 has, for example, one or more processors, memories and/or further electronic components.

The scroll compressor 100 has a drive motor 106. The drive motor 106 is an electric motor. According to further embodiments, the scroll compressor 110 is indirectly coupled with the drive motor. The drive motor is, for example, an internal combustion engine of a motor vehicle. Alternatively or additionally, the drive motor is a starter motor of a motor vehicle. The coupling to the scroll compressor is then effected, for example, by means of a belt or the like.

The drive motor 106 is coupled to the movable scroll 102 of the scroll compressor 110. The movable spiral 102 is also referred to as a wrap-around spiral or wrap-around scroll. The drive motor 106 is designed to rotate the movable screw 102 eccentrically.

The movable screw element 102 is pressed against the fixed screw element 101. In operation, the movable helix 102 rotates relative to the fixed helix 101. The stationary screw 101 and the movable screw 102 are pressed against each other in the axial direction in order to achieve a transport mass flow of the refrigerant. On account of the rotational movement of the movable screw 102 relative to the fixed screw 101, the refrigerant is compressed during operation. The scroll compressor 110 thus functions as a compressor of the air conditioning facility 100.

The movable screw 102 is arranged in a housing space 104 of a housing 103 of the scroll compressor 110. The housing 103 surrounds a housing space 104.

The scroll compressor 110 has a pressure valve 107. The pressure valve 107 is in particular a so-called pressure regulating valve or a pressure control valve. The pressure valve 107 is connected to the device 200, for example, in a signaling manner. The pressure valve 107 is provided to be able to regulate, in particular to reduce, the pressure in the housing space 104 on the side 105 of the movable screw part 102 facing away from the fixed screw part 101.

The pressure valve 107 is connected, for example, on the inlet side to the housing space 101, in particular on the side 105 facing away from it to the housing space 104. The outlet of the pressure valve 107 is connected, for example, to a suction region 113 of the scroll compressor 110. Thus, the pressure on the opposite sides 105 can be adjusted by opening and closing the pressure valve 107. The pressure on the opposite side 105 can be reduced in particular by opening the pressure valve 107.

The housing space 104 is connected to a high pressure outlet 109 of the scroll compressor 110. This connection is realized, for example, by one or more throttle valves 111. Alternatively or additionally, the connection is achieved by means of a valve 112. The throttle 111 is formed, for example, in the movable screw 102. Alternatively or additionally, the throttle valve is constructed in the housing 103. The valve 112 is, for example, a pressure regulating valve or a pressure control valve. The connection of the housing space 104 to the high-pressure outlet 109 makes it possible to increase the pressure in the housing space 104, in particular with the pressure valve 107 closed. To increase the pressure in the housing space 104, for example, the pressure valve 107 is closed and the valve 112 is opened. In order to reduce the pressure in the housing space 104, for example, the pressure valve 107 is opened and the valve 112 is closed. In the embodiment in which the throttle valve 111 is provided, the pressure in the housing space 104 can be reduced, because the pressure reduction caused by the valve 107 is greater than the pressure increase caused by the throttle valve 111.

The pressure in the housing space 104 on the side 105 facing away from the latter is decisive for the axial distance 108 between the fixed screw part 101 and the movable screw part 102. To transport the refrigerant efficiently, the spacing 108 must be as small as possible, or zero, in order to avoid undesirable leakage. The pressure in the housing space 104 on the side faces 105 facing away from each other is selected to be particularly great, so that the movable screw part 102 is pressed sufficiently firmly in the axial direction against the fixed screw part 101.

If leakage is desired in order to reduce the transport mass flow of the scroll compressor, the pressure in the housing space 104 at the sides 105 facing away is reduced. Thus, the movable screw 102 moves away from the fixed screw 101 in the axial direction and the distance 101 increases. The desired leakage is thus obtained and the transport mass flow is reduced.

For example, the increased spacing 108 and consequent leakage is maintained for a preset leakage period. In particular, the leakage time period is predetermined according to a predetermined nominal transport mass flow. Depending on which transport mass flow is actually required, an intentional leak is maintained.

As soon as an increased transport mass flow is desired again, the pressure in the housing space 104 on the side faces 105 facing away from each other is increased again. The movable screw part 102 is thus moved again in the axial direction in the direction of the fixed screw part 101. The spacing 108 is reduced. Thus reducing leakage. Thus increasing the transport mass flow.

The scroll compressor 110 thus has simple power regulation or power control. The mass flow which is transported in average overall over a longer period of time with a determined pressure ratio is set by varying the distance 108. Thus, variations in the average transport volume are possible. In this case, it is possible to dispense with an external suction throttle or bypass throttle. High efficiency of the scroll compressor 110 can be obtained. The two screws 101 and 102 can be moved away from each other in the axial direction. The compression is interrupted on the basis of the leakage thus deliberately adjusted. This takes place, for example, in pulses at defined time intervals. Thus enabling power regulation or power control. This is done in particular without additional, very expensive actuators in order to move the two screws 101, 102 away from each other or towards each other.

The opposite and opposite movements of the two screws 101, 102 are achieved by a change in the pressure on the opposite sides 105 of the movable screw 102. If the pressure on the side 105 facing away is greater than the pressure on the side 114 of the movable screw part 102 facing the fixed screw part 101, the movable screw part 102 is pressed in the axial direction against the fixed screw part 101. The scroll compressor 110 performs compression.

If the pressure on the opposite side 105 drops, the two screws 101, 102 move in opposite directions to each other based on the higher internal pressure on the facing side 114. The leakage thus becomes sufficiently large that the movable screw 102 moves approximately freely with very little power loss.

The pressure drop on the opposite side 105 is achieved, for example, by means of a pressure valve 107, which can reduce the pressure on the opposite side 105 by controlling the medium from there into the suction region 113 of the scroll compressor 110.

If the scroll compressor 110 is started from this situation and transports the medium again, the pressure on the side 105 of the movable screw part 102 facing away from it increases again. Thus, the scroll compressor 110 begins to be transported again. For this purpose, even with a large distance 108 between the oppositely moving screws 101, 102, a minimal pressure increase still occurs, which is transmitted from the high-pressure outlet 109 to the side 105 of the movable screw 102 facing away from it. The effect is self-reinforcing so that the gap 108 decreases and closes again. This conduction is effected, for example, by means of a throttle valve 111.

Alternatively or additionally, the pressure on the opposite side 105 is increased by the medium being conducted from a high-pressure region downstream of the outlet 109 to the opposite side 105 by means of a valve 112.

This opening and closing enables the power of the scroll compressor 110 to be adjusted. If the opening and closing is repeated within a defined time interval, particularly a short time interval, in the second range, a flexible control of the average power of the scroll compressor 110 is obtained.

Thus, this approach enables power regulation or power control of the scroll compressor 110 by virtue of the opposing and facing motion of the two screws 101, 102. In this case, the power control or power regulation can in particular make it possible to dispense with an actuator for the axial movement of one or both screws 101, 102. The power regulation or power control is achieved only by controlling the pressure on the opposite sides 105. Thus, the scroll compressor 110 is capable of power regulation or power control without additional components in the scroll compressor 110. Thus, a simple and reliable operation of the scroll compressor 110 can be achieved, in particular with a variable average power of the scroll compressor 110.