CN107036245B - Multi-split air conditioner system and control device and method of outdoor compressor thereof - Google Patents
Multi-split air conditioner system and control device and method of outdoor compressor thereof Download PDFInfo
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- CN107036245B CN107036245B CN201710278466.1A CN201710278466A CN107036245B CN 107036245 B CN107036245 B CN 107036245B CN 201710278466 A CN201710278466 A CN 201710278466A CN 107036245 B CN107036245 B CN 107036245B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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Abstract
The invention discloses a control device and a method for a multi-split system and an outdoor compressor thereof, wherein the control device comprises the following steps: the judging module is used for judging the current states of the first compressor and the second compressor; the first control module is used for controlling the first expansion valve and the second expansion valve to be opened when the current states of the first compressor and the second compressor are both in a stop state, controlling the first compressor to be started after first preset time, and controlling the second compressor to be started after second preset time; and the second control module is used for controlling the frequency of the first compressor to be reduced to a preset value and the second expansion valve to be opened when the current state of the first compressor is in an operating state and the current state of the second compressor is in a stop state, controlling the second compressor to be started after a first preset time, and controlling the first compressor to run by a preset program, so that the problem of unloading balance of the pressure difference between the discharge and the return of the compressor in a process from stop to start is solved, and the starting success rate of the compressor is improved.
Description
Technical Field
The present invention relates to the field of air conditioning technologies, and in particular, to a control apparatus for an outdoor compressor in an on-line system, a multi-split system, a control method for an outdoor compressor in a multi-split system, and a computer-readable storage medium.
Background
The multi-split air conditioner has large capacity, and in order to meet the linear regulation of large capacity and capacity requirements, one multi-split air conditioner external unit is often required to be provided with a plurality of high-pressure cavity variable-frequency scroll compressors, and the starting process of the high-pressure cavity variable-frequency scroll compressors has smaller requirement on the pressure difference of starting exhaust gas.
In the related art, after the multi-split external compressor is stopped, the electronic expansion valve is opened to a certain opening degree to balance the system pressure difference. However, when two compressors are connected to the multi-compressor external distribution network, the pressure difference balance control under the condition that one compressor is operated and the other compressor is started is only considered.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the art described above.
Therefore, a first object of the present invention is to provide a control device for an outdoor compressor in a multi-split system, which solves the problem of unloading balance of a pressure difference between exhaust and return air from shutdown to startup of the compressor, and improves the startup success rate of the compressor
A second object of the present invention is to provide a multi-split system.
The third purpose of the invention is to provide a control method of the outdoor compressor in the multi-split system.
A fourth object of the invention is to propose a computer-readable storage medium.
In order to achieve the above object, a first embodiment of the present invention provides a control device for an outdoor compressor in a multi-split air-conditioning system, where the multi-split air-conditioning system includes an outdoor unit and a plurality of indoor units, the outdoor unit includes a first compressor, a second compressor, a first expansion valve and a second expansion valve, a first port of the first expansion valve is connected to an exhaust port of the first compressor, a first port of the second expansion valve is connected to an exhaust port of the second compressor, an air inlet of the first compressor is connected to an air inlet of the second compressor and then respectively communicated to a second port of the first expansion valve and a second port of the second expansion valve, and the control device includes: the judging module is used for judging the current states of the first compressor and the second compressor; the first control module is used for controlling the first expansion valve and the second expansion valve to be opened when the current states of the first compressor and the second compressor are both in a shutdown state, controlling the first compressor to be started after a first preset time, and controlling the second compressor to be started after a second preset time, wherein the second preset time is longer than the first preset time; and the second control module is used for controlling the frequency of the first compressor to be reduced to a preset value and a second expansion valve to be opened when the current state of the first compressor is an operating state and the current state of the second compressor is a stop state, controlling the second compressor to be started after the first preset time, and controlling the first compressor to operate according to a preset program.
According to the control device of the outdoor compressor in the multi-split system, the judging module is used for judging the current states of the first compressor and the second compressor, when the current states of the first compressor and the second compressor are both in the stop state, the first control module is used for controlling the first expansion valve and the second expansion valve to be opened, the first compressor is controlled to be started after first preset time, the second compressor is controlled to be started after second preset time, when the current state of the first compressor is in the running state and the current state of the second compressor is in the stop state, the second control module is used for controlling the frequency of the first compressor to be reduced to the preset value and the second expansion valve to be opened, the second compressor is controlled to be started after the first preset time, and the first compressor is controlled to run in the preset program. Therefore, the device solves the problem of unloading balance of the pressure difference of the exhaust gas return from the shutdown to the startup process of the compressor, and improves the startup success rate of the compressor.
In addition, the control device for the outdoor compressor in the multi-split system according to the above embodiment of the present invention may further have the following additional technical features:
in an embodiment of the present invention, when the current states of the first compressor and the second compressor are both the shutdown state, the first control module is further configured to: and after a third preset time, controlling the first expansion valve and the second expansion valve to be closed so as to enable the multi-split air-conditioning system to enter a normal operation stage, wherein the third preset time is longer than the second preset time.
In an embodiment of the present invention, when the current status of the first compressor is an operating status and the current status of the second compressor is a shutdown status, the second control module is further configured to: and after the third preset time, controlling the second expansion valve to be closed so as to enable the multi-split air-conditioning system to enter the normal operation stage.
In an embodiment of the present invention, before determining the current status of the first compressor and the second compressor, the determining module is further configured to: and receiving a control instruction, and judging the current states of the first compressor and the second compressor when the control instruction comprises a compressor starting instruction.
In an embodiment of the present invention, the control device for the outdoor compressor in the multiple split system further includes: and the third control module is used for controlling the first compressor and the second compressor to be in a stop state and controlling the first expansion valve and the second expansion valve to be opened when the control instruction comprises a compressor closing instruction, and controlling the first expansion valve and the second expansion valve to be closed to enable the multi-split system to enter a standby stage after fourth preset time.
In order to achieve the above object, a multi-split system according to an embodiment of a second aspect of the present invention includes: the control device for the outdoor compressor in the multi-split system according to the embodiment of the first aspect of the invention.
According to the multi-split system provided by the embodiment of the invention, through the control device of the outdoor compressor in the multi-split system, the problem of unloading balance of the pressure difference between exhaust and return air in the process from shutdown to startup of the compressor is solved, and the starting success rate of the compressor is improved.
In order to achieve the above object, according to a third aspect of the present invention, a method for controlling an outdoor compressor in a multi-split air conditioning system is provided, where the multi-split air conditioning system includes an outdoor unit and a plurality of indoor units, the outdoor unit includes a first compressor, a second compressor, a first expansion valve and a second expansion valve, a first port of the first expansion valve is connected to an exhaust port of the first compressor, a first port of the second expansion valve is connected to an exhaust port of the second compressor, an air inlet of the first compressor is connected to an air inlet of the second compressor, and then the air inlets of the first compressor and the second compressor are respectively connected to a second port of the first expansion valve and a second port of the second expansion valve, the method includes: judging the current states of the first compressor and the second compressor; when the current states of the first compressor and the second compressor are both in a shutdown state, controlling the first expansion valve and the second expansion valve to be opened, controlling the first compressor to be started after a first preset time, and controlling the second compressor to be started after a second preset time, wherein the second preset time is longer than the first preset time; and when the current state of the first compressor is an operating state and the current state of the second compressor is a shutdown state, controlling the frequency of the first compressor to be reduced to a preset value, controlling the second expansion valve to be opened, controlling the second compressor to be started after the first preset time, and controlling the first compressor to operate according to a preset program.
According to the control method of the outdoor compressor in the multi-split system, the current states of the first compressor and the second compressor are judged, when the current states of the first compressor and the second compressor are both in a stop state, the first expansion valve and the second expansion valve are controlled to be opened, the first compressor is controlled to be started after first preset time, the second compressor is controlled to be started after second preset time, when the current state of the first compressor is in an operating state and the current state of the second compressor is in a stop state, the frequency of the first compressor is controlled to be reduced to a preset value, the second expansion valve is controlled to be opened, the second compressor is controlled to be started after the first preset time, and the first compressor is controlled to operate in a preset program. Therefore, the method solves the problem of unloading balance of the pressure difference of the exhaust gas back pressure in the process from the shutdown to the startup of the compressor, and improves the startup success rate of the compressor.
In addition, the control method for the outdoor compressor in the multi-split system according to the above embodiment of the present invention may further have the following additional technical features:
in one embodiment of the present invention, when the current states of the first compressor and the second compressor are both the shutdown state, the method further includes: and after a third preset time, controlling the first expansion valve and the second expansion valve to be closed so as to enable the multi-split air-conditioning system to enter a normal operation stage, wherein the third preset time is longer than the second preset time.
In an embodiment of the present invention, when the current state of the first compressor is an operating state and the current state of the second compressor is a shutdown state, the method further includes; and after the third preset time, controlling the second expansion valve to be closed so as to enable the multi-split air-conditioning system to enter the normal operation stage.
In one embodiment of the present invention, before determining the current states of the first compressor and the second compressor, the method further includes: and receiving a control instruction, and judging the current states of the first compressor and the second compressor when the control instruction comprises a compressor starting instruction.
In an embodiment of the present invention, the method for controlling an outdoor compressor in a multiple split air conditioning system further includes: when the control instruction comprises a compressor closing instruction, controlling the first compressor and the second compressor to be in a stop state, and controlling the first expansion valve and the second expansion valve to be opened; and after the fourth preset time, controlling the first expansion valve and the second expansion valve to be closed so as to enable the multi-split air-conditioning system to enter a standby stage.
To achieve the above object, a fourth aspect of the present invention provides a computer-readable storage medium having instructions stored therein, which when executed, perform a method of controlling an outdoor compressor in a multi-split system as set forth in any one of claims 7 to 11.
The computer-readable storage medium of an embodiment of the present invention, first determines the current status of the first compressor and the second compressor, when the current states of the first compressor and the second compressor are both in a stop state, controlling the first expansion valve and the second expansion valve to be opened, and controls the first compressor to start after a first preset time, and controls the second compressor to start after a second preset time, when the current state of the first compressor is an operation state and the current state of the second compressor is a stop state, controlling the frequency of the first compressor to be reduced to a preset value and controlling the second expansion valve to be opened, and controls the second compressor to start after the first preset time, and controls the first compressor to operate according to a preset program, therefore, the problem of unloading balance of the pressure difference of the exhaust back air in the process from shutdown to startup of the compressor is solved, and the success rate of starting the compressor is improved.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a block diagram of a control apparatus of an outdoor compressor in a multi-split system according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a multi-split system according to an embodiment of the present invention.
Fig. 3 is a block diagram of a control apparatus of an outdoor compressor in a multi-split system according to another embodiment of the present invention.
Fig. 4 is a flowchart of a method of controlling an outdoor compressor in a multi-split system according to an embodiment of the present invention.
Reference numerals: the outdoor unit comprises a judgment module 10, a first control module 20, a second control module 30, a third control module 40, an outdoor unit 100, a plurality of indoor units 200, a first compressor 101, a second compressor 102, a first expansion valve 103, a second expansion valve 104, a four-way valve 105, an outdoor heat exchanger 106, an outdoor fan 107, a third expansion valve 108, a first solenoid valve 109 and a second solenoid valve 110.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A multi-split system and a control apparatus and method of an outdoor compressor thereof according to an embodiment of the present invention will be described with reference to the accompanying drawings.
Fig. 1 is a block diagram of a control apparatus of an outdoor compressor in a multi-split system according to an embodiment of the present invention.
In an embodiment of the present invention, as shown in fig. 2, the multi-split system may include an outdoor unit 100 and a plurality of indoor units 200, the outdoor unit 100 may include a first compressor 101, a second compressor 102, a first expansion valve 103, and a second expansion valve 104, a first port of the first expansion valve 103 is connected to an exhaust port of the first compressor 101, a first port of the second expansion valve 104 is connected to an exhaust port of the second compressor 102, and an air inlet of the first compressor 101 and an air inlet of the second compressor 102 are connected to a second port of the first expansion valve 103 and a second port of the second expansion valve 104, respectively.
In addition, in another embodiment of the present invention, as shown in fig. 2, the outdoor unit 100 may further include a four-way valve 105, an outdoor heat exchanger 106, an outdoor fan 107, a third expansion valve 108, a first solenoid valve 109, and a second solenoid valve 110, an exhaust port of the first compressor 101 is connected to an exhaust port of the second compressor 102 and then communicated to a first port of the four-way valve 105, an intake port of the first compressor 101 is connected to an intake port of the second compressor 102 and then communicated to a second port of the four-way valve 105, a third port of the four-way valve 105 is connected to the outdoor heat exchanger 106, and a fourth port of the four-way valve 105 is connected to the outdoor heat exchanger 106 through the. The outdoor fan 107 is provided corresponding to the outdoor heat exchanger 106.
It should be noted that the outdoor unit 100 described in this embodiment may be connected to the indoor units 200 through a flow dividing device, and the flow dividing device may control the amount of the refrigerant flowing into each indoor unit 200, so as to perform accurate temperature control on each of the indoor units 200.
As shown in fig. 1, the control apparatus for an outdoor compressor in a multi-split system according to an embodiment of the present invention includes: a determination module 10, a first control module 20, and a second control module 30.
The judging module 10 is configured to judge current states of the first compressor 101 and the second compressor 102. The first compressor 101 and the second compressor 102 may be variable frequency scroll compressors.
In an embodiment of the present invention, before determining the current states of the first compressor 101 and the second compressor 102, the determining module 10 is further configured to receive a control instruction, and determine the current states of the first compressor 101 and the second compressor 102 when the control instruction includes a compressor start instruction.
Specifically, as shown in fig. 2, during the start-up of the multi-split air-conditioning system (i.e., the multi-split air-conditioner), the main control program of the multi-split air-conditioning system issues a control command to control the first compressor 101 and the second compressor 102. When the determining module 10 receives a control instruction sent by a main control program of the multi-split system, it determines whether the control program includes a compressor start instruction, and if so, further determines the current states of the first compressor 101 and the second compressor 102. It should be noted that the data of the outdoor compressor configured in the multi-split system described in the above embodiments includes, but is not limited to, two, and the number of the corresponding expansion valves connected in parallel to the outdoor compressor also includes, but is not limited to, two.
The first control module 20 is configured to control the first expansion valve 103 and the second expansion valve 104 to be opened when the current states of the first compressor 101 and the second compressor 102 are both shutdown states, control the first compressor 101 to be started after a first preset time, and control the second compressor 102 to be started after a second preset time, where the second preset time is greater than the first preset time, and both the first preset time and the second preset time may be calibrated according to an actual situation.
Specifically, as shown in fig. 2, when the determination module 10 determines that the current states of the first compressor 101 and the second compressor 102 are both the shutdown state, the first control module 20 may first control the first expansion valve 103 and the second expansion valve 104 to be opened to balance the system pressure difference (i.e., balance the pressure between the intake port and the exhaust port of the first compressor 101 and the second compressor 102), and control the first compressor 101 to start after a first preset time, and control the second compressor 102 to start after a second preset time. It should be noted that, in this embodiment, after controlling the opening of the first expansion valve 103 and the second expansion valve 104, the first control module 20 may control the opening degrees of the first expansion valve 103 and the second expansion valve 104 according to actual conditions, so as to accurately balance the system pressure difference and improve the compressor differential pressure starting.
Further, when the current states of the first compressor 101 and the second compressor 102 are both in a shutdown state, the first control module 10 may be further configured to control the first expansion valve 103 and the second expansion valve 104 to be closed after a third preset time, so that the multi-split air-conditioning system enters a normal operation stage, where the third preset time is greater than the second preset time, and the third preset time may also be calibrated according to an actual situation. It should be noted that, when the multi-split air-conditioning system enters the normal operation stage, cooling or heating will be performed according to the instruction of the user, and at this time, the tasks of the first expansion valve 103 and the second expansion valve 104 may be finished, that is, the first expansion valve 103 and the second expansion valve 104 may not need to be opened when the multi-split air-conditioning system enters the normal operation stage.
The second control module 30 is configured to, when the current state of the first compressor 101 is an operating state and the current state of the second compressor 102 is a shutdown state, control the frequency of the first compressor 101 to be reduced to a preset value and the second expansion valve 104 to be opened, control the second compressor 102 to be started after a first preset time, and control the first compressor 101 to operate according to a preset program. The preset program can be calibrated according to the actual condition, and the preset value can be calibrated according to the actual condition.
Specifically, as shown in fig. 2, when the determining module 10 determines that the current state of the first compressor 101 is the running state and the current state of the second compressor 102 is the shutdown state, the first control module 20 may first control the frequency of the first compressor 101 to be decreased to a preset value to decrease the pressure at the exhaust port of the first compressor 101, and simultaneously control the second expansion valve 104 to be opened to balance the pressure between the intake port and the exhaust port of the second compressor 102. And then controlling the second compressor 102 to start after the first preset time, and simultaneously controlling the first compressor 101 to operate according to a preset program, thereby realizing the pressure difference balance control when the second compressor 102 starts when the first compressor 101 operates.
Further, when the determining module 10 determines that the current state of the first compressor 101 is the running state and the current state of the second compressor 102 is the shutdown state, the second control module 30 may be further configured to control the second expansion valve 104 to close after a third preset time to enable the multi-split air-conditioning system to enter the normal running stage.
In summary, the control device for the outdoor compressor in the multi-split system provided by the embodiment of the invention can solve the problem of unloading balance of the pressure difference between exhaust and return air in the process from shutdown to startup of the compressor, and improve the success rate of starting the compressor.
In addition, in order to achieve the discharge back pressure difference unloading balance after the compressor is stopped, in an embodiment of the present invention, as shown in fig. 3, the control apparatus of the outdoor compressor in the multi-split air-conditioning system may further include a third control module 40, where the third control module 40 is configured to control the first compressor 101 and the second compressor 102 to be in a stop state and control the first expansion valve 103 and the second expansion valve 104 to be opened when the control command includes a compressor-off command, and control the first expansion valve 103 and the second expansion valve 104 to be closed after a fourth preset time to enable the multi-split air-conditioning system to enter a standby stage. And the fourth preset time can be calibrated according to the actual condition.
Specifically, as shown in fig. 2, when the third control module 40 receives a control command including a compressor shutdown command from a main control program of the multi-split system, the first compressor 101 and the second compressor 102 are first controlled to be in a shutdown state, that is, when the first compressor 101 and/or the second compressor 102 are in an operating state, the first compressor 101 and/or the second compressor 102 are controlled to be shut down, so as to control the first compressor 101 and the second compressor 102 to be in the shutdown state. And simultaneously controlling the first expansion valve 103 and the second expansion valve 104 to be opened, and after a fourth preset time, controlling the first expansion valve 103 and the second expansion valve 104 to be closed so as to enable the multi-split air-conditioning system to enter a standby stage. Therefore, the third control module 40 can balance the pressure difference between the discharge gases of the first compressor and the second compressor within the fourth preset time, so as to prevent the first compressor 101 and the second compressor 102 from starting again with the pressure difference.
In summary, according to the control apparatus for an outdoor compressor in a multi-split system according to an embodiment of the present invention, the determining module determines current states of the first compressor and the second compressor, when the current states of the first compressor and the second compressor are both in the shutdown state, the first control module controls the first expansion valve and the second expansion valve to open, controls the first compressor to start after a first preset time, and controls the second compressor to start after a second preset time, when the current state of the first compressor is in the operating state, and the current state of the second compressor is in the shutdown state, the second control module controls the frequency of the first compressor to decrease to a preset value and the second expansion valve to open, controls the second compressor to start after the first preset time, and controls the first compressor to operate according to a preset program. Therefore, the device solves the problem of unloading balance of the pressure difference of the exhaust gas return from the shutdown to the startup process of the compressor, and improves the startup success rate of the compressor.
In order to implement the above embodiments, the present invention further provides a multi-split system, which includes a control device for an outdoor compressor in the multi-split system.
According to the multi-split system provided by the embodiment of the invention, through the control device of the outdoor compressor in the multi-split system, the problem of unloading balance of the pressure difference between exhaust and return air in the process from shutdown to startup of the compressor is solved, and the starting success rate of the compressor is improved.
Fig. 4 is a flowchart of a method of controlling an outdoor compressor in a multi-split system according to an embodiment of the present invention.
In an embodiment of the present invention, as shown in fig. 2, the multi-split system may include an outdoor unit and a plurality of indoor units, the outdoor unit may include a first compressor, a second compressor, a first expansion valve and a second expansion valve, a first port of the first expansion valve is connected to an exhaust port of the first compressor, a first port of the second expansion valve is connected to an exhaust port of the second compressor, and an air inlet of the first compressor and an air inlet of the second compressor are connected and then respectively connected to a second port of the first expansion valve and a second port of the second expansion valve.
In addition, in another embodiment of the present invention, as shown in fig. 2, the outdoor unit may further include a four-way valve, an outdoor heat exchanger, an outdoor fan, a third expansion valve, a first solenoid valve and a second solenoid valve, an exhaust port of the first compressor and an exhaust port of the second compressor are connected and then communicated to a first port of the four-way valve, an air inlet of the first compressor and an air inlet of the second compressor are connected and then communicated to a second port of the four-way valve, a third port of the four-way valve is connected to the outdoor heat exchanger, and a fourth port of the four-way valve is connected to the outdoor heat exchanger through the. Wherein, the outdoor fan is arranged corresponding to the outdoor heat exchanger.
It should be noted that the outdoor unit described in this embodiment may be connected to the plurality of indoor units through the flow dividing device, and the flow dividing device may control the amount of the refrigerant flowing into each indoor unit, so as to perform accurate temperature control on the plurality of indoor units.
As shown in fig. 1, the method for controlling an outdoor compressor in a multi-split system according to an embodiment of the present invention includes the following steps:
and S1, judging the current states of the first compressor and the second compressor. The first compressor 101 and the second compressor 102 may be variable frequency scroll compressors.
In an embodiment of the present invention, the determining the current states of the first compressor and the second compressor may further include receiving a control command, and determining the current states of the first compressor and the second compressor when the control command includes a compressor on command.
Specifically, as shown in fig. 2, during the start-up of the multi-split air-conditioning system (i.e., the multi-split air-conditioner), the main control program of the multi-split air-conditioning system issues a control command to control the first compressor and the second compressor. When the multi-split system receives a control instruction sent by a main control program of the multi-split system, whether the control program comprises a compressor starting instruction is judged, and if yes, the current states of the first compressor and the second compressor are further judged. It should be noted that the data of the outdoor compressor configured in the multi-split system described in the above embodiments includes, but is not limited to, the number of two corresponding expansion valves connected in parallel to the outdoor compressor, and also includes, but is not limited to, two.
S2, when the current states of the first compressor and the second compressor are both in a shutdown state, controlling the first expansion valve and the second expansion valve to be opened, controlling the first compressor to be started after a first preset time, and controlling the second compressor to be started after a second preset time, wherein the second preset time is longer than the first preset time, and both the first preset time and the second preset time can be calibrated according to actual conditions.
Specifically, as shown in fig. 2, when the multi-split system determines that the current states of the first compressor and the second compressor are both the shutdown state, the first expansion valve and the second expansion valve may be controlled to be opened first to balance the system pressure difference (i.e., to balance the pressure between the intake port and the exhaust port of the first compressor and the second compressor), and the first compressor may be controlled to be started after a first preset time, and the second compressor may be controlled to be started after a second preset time. It should be noted that, in the multi-split system in this embodiment, after controlling the opening of the first expansion valve and the second expansion valve, the opening degrees of the first expansion valve and the second expansion valve may be controlled according to actual conditions, so as to accurately balance the system pressure difference and improve the compressor differential pressure start.
Further, when the multi-split air-conditioning system judges that the current states of the first compressor and the second compressor are both in a shutdown state, the method may further include controlling the first expansion valve and the second expansion valve to be closed after a third preset time so that the multi-split air-conditioning system enters a normal operation stage, wherein the third preset time is greater than the second preset time, and the third preset time may also be calibrated according to an actual situation. It should be noted that, when the multi-split air-conditioning system enters the normal operation stage, cooling or heating will be performed according to the instruction of the user, and at this time, the tasks of the first expansion valve and the second expansion valve may be finished, that is, the first expansion valve and the second expansion valve may not need to be opened when the multi-split air-conditioning system enters the normal operation stage.
And S3, when the current state of the first compressor is an operating state and the current state of the second compressor is a shutdown state, controlling the frequency of the first compressor to be reduced to a preset value and a second expansion valve to be opened, controlling the second compressor to be started after the first preset time, and controlling the first compressor to operate according to a preset program. The preset program can be calibrated according to the actual condition, and the preset value can be calibrated according to the actual condition.
Specifically, as shown in fig. 2, when the multi-split system determines that the current state of the first compressor is the operating state and the current state of the second compressor is the shutdown state, the frequency of the first compressor may be controlled to be reduced to a preset value to reduce the pressure at the exhaust port of the first compressor, and the second expansion valve may be controlled to be opened to balance the pressure between the intake port and the exhaust port of the second compressor. And then controlling the second compressor to start after the first preset time, and simultaneously controlling the first compressor to run according to a preset program, thereby realizing the pressure difference balance control when the second compressor starts when the first compressor runs.
Further, when the multi-split air-conditioning system judges that the current state of the first compressor is the operating state and the current state of the second compressor is the shutdown state, the method may further include controlling the second expansion valve to close after a third preset time so that the multi-split air-conditioning system enters a normal operation stage.
In summary, the control method for the outdoor compressor in the multi-split system provided by the embodiment of the invention can solve the problem of unloading balance of the pressure difference between the exhaust and the return of the compressor in the process from shutdown to startup, and improve the success rate of starting the compressor.
In addition, in order to achieve the discharge back pressure difference unloading balance after the compressor is stopped, in an embodiment of the present invention, the method for controlling an outdoor compressor in a multi-split air-conditioning system may further include controlling the first compressor and the second compressor to be in a stopped state and controlling the first expansion valve and the second expansion valve to be opened when the control command includes a compressor closing command, and controlling the first expansion valve and the second expansion valve to be closed after a fourth preset time to enable the multi-split air-conditioning system to enter a standby stage. And the fourth preset time can be calibrated according to the actual condition.
Specifically, as shown in fig. 2, when the multi-split air-conditioning system receives a control instruction including a compressor shutdown instruction sent by a main control program of the multi-split air-conditioning system, the first compressor and the second compressor are controlled to be in a shutdown state first, that is, when the first compressor and/or the second compressor are in an operating state, the first compressor and/or the second compressor are controlled to be shut down, so that the first compressor and the second compressor are controlled to be in the shutdown state. And simultaneously controlling the first expansion valve and the second expansion valve to be opened, and after a fourth preset time, controlling the first expansion valve and the second expansion valve to be closed so as to enable the multi-split system to enter a standby stage. Therefore, the multi-split system can realize the balance of the exhaust-return pressure difference of the first compressor and the second compressor within the fourth preset time, so that the first compressor and the second compressor can be prevented from starting again with the pressure difference.
In summary, according to the method for controlling an outdoor compressor in a multi-split system according to an embodiment of the present invention, current states of a first compressor and a second compressor are first determined, when the current states of the first compressor and the second compressor are both shutdown states, a first expansion valve and a second expansion valve are controlled to be opened, the first compressor is controlled to be started after a first preset time, the second compressor is controlled to be started after a second preset time, when the current state of the first compressor is an operating state and the current state of the second compressor is a shutdown state, a frequency of the first compressor is controlled to be reduced to a preset value, the second expansion valve is controlled to be opened, the second compressor is controlled to be started after the first preset time, and the first compressor is controlled to operate according to a preset program. Therefore, the method solves the problem of unloading balance of the pressure difference of the exhaust gas back pressure in the process from the shutdown to the startup of the compressor, and improves the startup success rate of the compressor.
In addition, an embodiment of the present invention also provides a computer-readable storage medium having instructions stored therein, which, when executed, perform the above-described method of controlling an outdoor compressor in a multi-split system.
The computer-readable storage medium of an embodiment of the present invention, first determines the current status of the first compressor and the second compressor, when the current states of the first compressor and the second compressor are both in a stop state, controlling the first expansion valve and the second expansion valve to be opened, and controls the first compressor to start after a first preset time, and controls the second compressor to start after a second preset time, when the current state of the first compressor is an operation state and the current state of the second compressor is a stop state, controlling the frequency of the first compressor to be reduced to a preset value and controlling the second expansion valve to be opened, and controls the second compressor to start after the first preset time, and controls the first compressor to operate according to a preset program, therefore, the problem of unloading balance of the pressure difference of the exhaust back air in the process from shutdown to startup of the compressor is solved, and the success rate of starting the compressor is improved.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (12)
1. The utility model provides a controlling means of outdoor compressor among multi-split system, its characterized in that, multi-split system includes off-premises station and a plurality of indoor set, the off-premises station includes first compressor, second compressor, first expansion valve and second expansion valve, the first port of first expansion valve with the gas vent of first compressor links to each other, the first port of second expansion valve with the gas vent of second compressor links to each other, the air inlet of first compressor with the air inlet of second compressor links to each other the back and leads to respectively the second port of first expansion valve with the second port of second expansion valve, controlling means includes:
the judging module is used for judging the current states of the first compressor and the second compressor;
the first control module is used for controlling the first expansion valve and the second expansion valve to be opened when the current states of the first compressor and the second compressor are both in a shutdown state, controlling the first compressor to be started after a first preset time, and controlling the second compressor to be started after a second preset time, wherein the second preset time is longer than the first preset time;
and the second control module is used for controlling the frequency of the first compressor to be reduced to a preset value and a second expansion valve to be opened when the current state of the first compressor is an operating state and the current state of the second compressor is a stop state, controlling the second compressor to be started after the first preset time, and controlling the first compressor to operate according to a preset program.
2. The apparatus for controlling an outdoor compressor in a multi-split system as set forth in claim 1, wherein when the current states of the first compressor and the second compressor are both in a shutdown state, the first control module is further configured to:
and after a third preset time, controlling the first expansion valve and the second expansion valve to be closed so as to enable the multi-split air-conditioning system to enter a normal operation stage, wherein the third preset time is longer than the second preset time.
3. The apparatus for controlling an outdoor compressor in a multi-split system as claimed in claim 2, wherein when the current status of the first compressor is an operation status and the current status of the second compressor is a stop status, the second control module is further configured to:
and after the third preset time, controlling the second expansion valve to be closed so as to enable the multi-split air-conditioning system to enter the normal operation stage.
4. The apparatus for controlling an outdoor compressor in a multi-split system as set forth in claim 1, wherein before the determining the current status of the first compressor and the second compressor, the determining means is further configured to:
and receiving a control instruction, and judging the current states of the first compressor and the second compressor when the control instruction comprises a compressor starting instruction.
5. The control apparatus of an outdoor compressor in a multi-split system as set forth in claim 4, further comprising:
and the third control module is used for controlling the first compressor and the second compressor to be in a stop state and controlling the first expansion valve and the second expansion valve to be opened when the control instruction comprises a compressor closing instruction, and controlling the first expansion valve and the second expansion valve to be closed to enable the multi-split system to enter a standby stage after fourth preset time.
6. A multi-split system, comprising a control device of an outdoor compressor in the multi-split system as claimed in any one of claims 1 to 5.
7. A control method for an outdoor compressor in a multi-split air conditioning system is characterized in that the multi-split air conditioning system comprises an outdoor unit and a plurality of indoor units, the outdoor unit comprises a first compressor, a second compressor, a first expansion valve and a second expansion valve, a first port of the first expansion valve is connected with an exhaust port of the first compressor, a first port of the second expansion valve is connected with an exhaust port of the second compressor, an air inlet of the first compressor is connected with an air inlet of the second compressor and then respectively communicated with a second port of the first expansion valve and a second port of the second expansion valve, and the control method comprises the following steps:
judging the current states of the first compressor and the second compressor;
when the current states of the first compressor and the second compressor are both in a shutdown state, controlling the first expansion valve and the second expansion valve to be opened, controlling the first compressor to be started after a first preset time, and controlling the second compressor to be started after a second preset time, wherein the second preset time is longer than the first preset time;
and when the current state of the first compressor is an operating state and the current state of the second compressor is a shutdown state, controlling the frequency of the first compressor to be reduced to a preset value, controlling the second expansion valve to be opened, controlling the second compressor to be started after the first preset time, and controlling the first compressor to operate according to a preset program.
8. The method for controlling an outdoor compressor in a multi-split system as set forth in claim 7, wherein when the current states of the first compressor and the second compressor are both in a shutdown state, further comprising:
and after a third preset time, controlling the first expansion valve and the second expansion valve to be closed so as to enable the multi-split air-conditioning system to enter a normal operation stage, wherein the third preset time is longer than the second preset time.
9. The method for controlling an outdoor compressor in a multi-split system as set forth in claim 8, wherein when the current state of the first compressor is an operation state and the current state of the second compressor is a stop state, further comprising;
and after the third preset time, controlling the second expansion valve to be closed so as to enable the multi-split air-conditioning system to enter the normal operation stage.
10. The method for controlling an outdoor compressor in a multi-split system as set forth in claim 7, further comprising, before determining the current states of the first compressor and the second compressor:
and receiving a control instruction, and judging the current states of the first compressor and the second compressor when the control instruction comprises a compressor starting instruction.
11. The method for controlling an outdoor compressor in a multi-split system as set forth in claim 10, further comprising:
when the control instruction comprises a compressor closing instruction, controlling the first compressor and the second compressor to be in a stop state, and controlling the first expansion valve and the second expansion valve to be opened;
and after the fourth preset time, controlling the first expansion valve and the second expansion valve to be closed so as to enable the multi-split air-conditioning system to enter a standby stage.
12. A computer-readable storage medium having instructions stored therein, wherein when the instructions are executed, the multiple split system performs the method for controlling an outdoor compressor in the multiple split system according to any one of claims 7 to 11.
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| CN108224839B (en) * | 2017-12-29 | 2020-06-09 | Tcl空调器(中山)有限公司 | Multi-split air conditioning system and control method thereof |
| CN108709297A (en) * | 2018-05-31 | 2018-10-26 | 青岛海信日立空调系统有限公司 | Air conditioning control method and control device |
| CN109812920B (en) * | 2019-02-25 | 2021-01-19 | 奥克斯空调股份有限公司 | Method and device for controlling starting and stopping of multiple compressors of air conditioner and multi-split system |
| CN110319542B (en) * | 2019-06-28 | 2020-11-20 | 广东志高暖通设备股份有限公司 | Unloading start-stop control method of large-displacement variable-frequency multi-split system |
| CN110332670A (en) * | 2019-07-16 | 2019-10-15 | 珠海格力电器股份有限公司 | Compressor control method and control device and coolant system |
| CN110793169B (en) * | 2019-09-23 | 2021-04-02 | 珠海格力电器股份有限公司 | Dual-system control method and device and dual-system air conditioning equipment |
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