CN114165909A - Air conditioning system, control method of air conditioning system, and computer-readable storage medium - Google Patents
Air conditioning system, control method of air conditioning system, and computer-readable storage medium Download PDFInfo
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- CN114165909A CN114165909A CN202010947518.1A CN202010947518A CN114165909A CN 114165909 A CN114165909 A CN 114165909A CN 202010947518 A CN202010947518 A CN 202010947518A CN 114165909 A CN114165909 A CN 114165909A
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000003507 refrigerant Substances 0.000 claims abstract description 209
- 238000002347 injection Methods 0.000 claims abstract description 31
- 239000007924 injection Substances 0.000 claims abstract description 31
- 238000001514 detection method Methods 0.000 claims description 9
- 238000004590 computer program Methods 0.000 claims description 7
- 238000004781 supercooling Methods 0.000 abstract description 30
- 239000007788 liquid Substances 0.000 description 6
- 238000005057 refrigeration Methods 0.000 description 6
- 239000000243 solution Substances 0.000 description 5
- 238000001816 cooling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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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
- F24F11/89—Arrangement or mounting of control or safety devices
-
- 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
- F24F11/64—Electronic processing using pre-stored data
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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
- F24F11/88—Electrical aspects, e.g. circuits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/24—Means for preventing or suppressing noise
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/24—Means for preventing or suppressing noise
- F24F2013/247—Active noise-suppression
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Thermal Sciences (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The present invention provides an air conditioning system, a control method of the air conditioning system, and a computer-readable storage medium, wherein the air conditioning system includes: an outdoor heat exchanger; an indoor heat exchanger; a compressor including a suction port and an injection port; the subcooler comprises a first refrigerant flow path and a second refrigerant flow path, wherein the first end of the first refrigerant flow path is connected with the outdoor heat exchanger, and the second end of the first refrigerant flow path is respectively connected with the indoor heat exchanger and the first end of the second refrigerant flow path; and the switching component is arranged between the second end of the second refrigerant flow path and the compressor and is used for switching the refrigerant to flow to the suction port or the jet port. When the supercooling degree of the system is low, the refrigerant flows back to the air suction port of the compressor, so that the problem of poor noise of the indoor unit can be avoided under the condition of ensuring the supercooling degree of the system. When the supercooling degree of the system is higher, the refrigerant flows back to the medium-pressure cavity of the compressor, so that the occupation of the air suction volume of the compressor is reduced, and the refrigerating capacity is increased.
Description
Technical Field
The present invention relates to the field of air conditioning technologies, and in particular, to an air conditioning system, a control method of the air conditioning system, and a computer-readable storage medium.
Background
In the related art, after the refrigerant comes out of the outdoor condenser, the refrigerant is divided into two paths to enter the supercooling device, the main path refrigerant directly enters the supercooling device, and the auxiliary path refrigerant enters the supercooling device after being throttled by the throttling device, absorbs the heat of the main path refrigerant, turns into gas and then flows back to the compressor. In this way, how to ensure the supercooling degree and the refrigerating capacity of the system becomes a technical problem to be solved urgently.
Disclosure of Invention
A primary object of the present invention is to provide an air conditioning system, a control method of the air conditioning system, and a computer-readable storage medium, which are intended to solve at least one of the technical problems of the related art or related art.
To achieve the above object, the present invention provides an air conditioning system, comprising: an outdoor heat exchanger; an indoor heat exchanger; a compressor including a suction port and an injection port; the subcooler comprises a first refrigerant flow path and a second refrigerant flow path, wherein the first end of the first refrigerant flow path is connected with the outdoor heat exchanger, and the second end of the first refrigerant flow path is respectively connected with the indoor heat exchanger and the first end of the second refrigerant flow path; and the switching component is arranged between the second end of the second refrigerant flow path and the compressor and is used for switching the refrigerant to flow to the suction port or the jet port.
Further, the switching means includes: the first valve body is arranged between the second end of the second refrigerant flow path and the suction port; and the second valve body is arranged between the second end of the second refrigerant flow path and the injection port, wherein the refrigerant flows from the second end of the second refrigerant flow path to the suction port when the first valve body is opened and the second valve body is closed, and the refrigerant flows from the second end of the second refrigerant flow path to the injection port when the first valve body is closed and the second valve body is opened.
Further, the compressor still includes the gas vent, and air conditioning system still includes: and the pressure detection device is arranged at the exhaust port and is used for detecting the exhaust pressure of the compressor.
Further, the air conditioning system further includes: and the temperature detection device is arranged at the second end of the first refrigerant flow path and is used for detecting the temperature of the second end of the first refrigerant flow path.
Further, the air conditioning system further includes: the first throttling device is arranged at the first end of the second refrigerant flow path.
Further, the air conditioning system further includes: the second throttling device is arranged at the first end of the first refrigerant flow path.
The invention also provides a control method of the air conditioning system, which is used for the air conditioning system and comprises the following steps: acquiring the exhaust pressure of the compressor and the temperature of the second end of the first refrigerant flow path; and controlling the switching part to operate according to the exhaust pressure and the temperature so as to switch the flow direction of the refrigerant to the suction port of the compressor or the injection port of the compressor.
Further, controlling the switching member to act according to the exhaust pressure and the temperature specifically includes: determining a preset temperature corresponding to the exhaust pressure; and acquiring a difference value between the preset temperature and the temperature, and controlling the action of the switching component according to the difference value.
Further, controlling the switching component to act according to the difference specifically includes: controlling a first valve body of the switching part to be opened and a second valve body of the switching part to be closed based on the difference value being less than or equal to the first threshold value, so that the refrigerant flows to the suction port from a second end of the second refrigerant flow path; and controlling the first valve body to close and the second valve body to open based on the difference value being greater than or equal to a second threshold value, so that the refrigerant flows from the second end of the second refrigerant flow path to the injection port, wherein the second threshold value is greater than the first threshold value.
The present invention also proposes a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the control method of the air conditioning system described above.
In the technical scheme of the invention, when the air conditioning system is used for refrigerating, the flow direction of the refrigerant of the second refrigerant flow path is controlled by the supercooling degree of the system. When the supercooling degree of the system is low, the refrigerant of the second refrigerant flow path flows back to the air suction port of the compressor, so that the problem of poor noise of the indoor unit can be avoided under the condition of ensuring the supercooling degree of the system. When the supercooling degree of the system is higher, the refrigerant of the second refrigerant flow path flows back to the medium-pressure cavity of the compressor, so that the occupation of the air suction volume of the compressor is reduced, and the refrigerating capacity is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 shows a schematic configuration of an air conditioning system according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating a control method of an air conditioning system according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating a control method of an air conditioning system according to another embodiment of the present invention;
fig. 4 shows a schematic view of the manner of control of the first and second valve bodies of one embodiment of the invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 102 | |
104 | |
| 106 | Compressor | 108 | |
| 1082 | First refrigerant flow path | 1084 | Second |
| 110 | |
1102 | |
| 1104 | |
112 | |
| 114 | Temperature detection device | 116 | First throttling means |
| 118 | Second throttling means | 120 | First temperature sensor |
| 122 | |
124 | Gas- |
| 126 | Four- |
128 | |
| 130 | Second stop valve | A | Air suction inlet |
| B | Jet orifice | C | Exhaust port |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes 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 at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. 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 addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
In an embodiment of the first aspect of the present invention, an air conditioning system is provided, and fig. 1 shows a schematic structural diagram of an air conditioning system according to an embodiment of the present invention. Wherein, this air conditioning system includes:
an outdoor heat exchanger 102;
an indoor heat exchanger 104;
a compressor 106, the compressor 106 including an inlet port a and an outlet port B;
the subcooler 108, the subcooler 108 includes a first refrigerant flow path 1082 and a second refrigerant flow path 1084, a first end of the first refrigerant flow path 1082 is connected with the outdoor heat exchanger, and a second end of the first refrigerant flow path 1082 is connected with first ends of the indoor heat exchanger 104 and the second refrigerant flow path 1084 respectively;
the switching member 110 is disposed between the second end of the second refrigerant passage 1084 and the compressor 106, and the switching member 110 is configured to switch the refrigerant flowing to the suction port a or the injection port B.
In this embodiment, the subcooler 108 has a first refrigerant passage 1082 and a second refrigerant passage 1084, the first refrigerant passage 1082 being a main passage, and the second refrigerant passage 1084 being an auxiliary passage. After the refrigerant exits from the outdoor heat exchanger 102, the refrigerant enters the subcooler 108 from the first end of the first refrigerant flow path 1082, exits the subcooler 108 from the second end of the first refrigerant flow path 1082, enters the indoor heat exchanger 104 from a part of the refrigerant exiting the chiller 108 from the second end of the first refrigerant flow path 1082, and enters the subcooler 108 from the first end of the second refrigerant flow path 1084 again. The refrigerant, which enters the subcooler 108 again, absorbs the heat of the refrigerant in the first refrigerant flow path 1082 to become gas, and then flows back to the compressor 106 through the second end of the second refrigerant flow path 1084 to be recompressed, so that the refrigerant in the auxiliary flow path exchanges heat with the refrigerant in the main flow path, and the refrigerant in the main flow path is condensed or cooled by the refrigerant in the auxiliary flow path, thereby improving the refrigeration effect.
The flow path of the refrigerant flowing from the second end of the second refrigerant flow path 1084 back to the compressor 106 includes: from the second end of the second refrigerant passage 1084 to the suction port a of the compressor 106, and from the second end of the second refrigerant passage 1084 to the injection port B of the compressor 106. The switching means 110 is provided to switch the refrigerant flow path between the second end of the second refrigerant flow path 1084 and the suction port a and the refrigerant flow path between the second end of the second refrigerant flow path 1084 and the injection port B. Specifically, when the air conditioning system is used for refrigerating, the flow direction of the refrigerant of the auxiliary flow path is controlled through the supercooling degree of the system. When the supercooling degree of the system is low, the refrigerant of the auxiliary flow path flows back to the air suction port A of the compressor 106, so that the problem of poor noise of the indoor unit can be avoided under the condition of ensuring the supercooling degree of the system. When the supercooling degree of the system is high, the refrigerant of the auxiliary flow path flows back to the injection port B of the compressor 106, that is, flows back to the medium pressure cavity of the compressor 106, thereby reducing the occupation of the suction volume of the compressor and increasing the refrigerating capacity.
It should be noted that the air conditioning system of the present invention may be a multi-split air conditioning system, and the indoor heat exchanger 104 may include a plurality of air conditioning systems.
In one embodiment, switching component 110 includes:
a first valve body 1102, wherein the first valve body 1102 is arranged between the second end of the second refrigerant flow path 1084 and the suction port A;
and a second valve body 1104 interposed between a second end of the second refrigerant passage 1084 and the injection port B, wherein the refrigerant flows from the second end of the second refrigerant passage 1084 to the suction port a when the first valve body 1102 is opened and the second valve body 1104 is closed, and the refrigerant flows from the second end of the second refrigerant passage 1084 to the injection port B when the first valve body 1102 is closed and the second valve body 1104 is opened.
In this embodiment, the switching member 110 includes a first valve body 1102 and a second valve body 1104, one end of the first valve body 1102 is connected to the second end of the second refrigerant passage 1084, the other end of the first valve body 1102 is connected to the suction port a of the compressor 106, one end of the second valve body 1104 is connected to the second end of the second refrigerant passage 1084, and the other end of the second valve body 1104 is connected to the injection port B of the compressor 106. By controlling the opening or closing of the first valve 1102 and the second valve 1104 to switch the flow path from the refrigerant flowing out of the second end of the second refrigerant flow path 1084 to the suction port a or the injection port B, the subcooling degree of the system can be ensured, and the cooling capacity of the system can be increased.
Specifically, the discharge pressure at the discharge port C of the compressor 106 is obtained, and the temperature of the second end of the first refrigerant flow path 1082, that is, the temperature of the connection pipeline between the second end of the first refrigerant flow path 1082 and the indoor heat exchanger 104, is obtained. Further, a preset temperature corresponding to the exhaust pressure, that is, a saturation temperature corresponding to the exhaust pressure, is determined, and for example, the preset temperature corresponding to the exhaust pressure is obtained by querying a correspondence relationship between the exhaust pressure stored in advance and the preset temperature. Then calculating the difference between the preset temperature and the temperature, judging the difference, when the difference is less than or equal to the first threshold, indicating that the supercooling degree of the system is low, and at the moment, the supercooling degree of the system needs to be improved, controlling the first valve body 1102 to be opened and the second valve body 1104 to be closed, so that the refrigerant flows to the air suction port A of the compressor 106 from the second end of the second refrigerant flow path 1084; when the difference is greater than or equal to the second threshold, indicating that the degree of subcooling of the system is high, the first valve body 1102 is controlled to close and the second valve body 1104 is controlled to open, so that the refrigerant flows from the second end of the second refrigerant flow path 1084 to the injection port B of the compressor 106, and the refrigeration capacity of the system is improved.
The second threshold is greater than the first threshold, and when the difference is greater than or equal to the second threshold, the refrigerant flows back to the injection port B of the compressor 106; when the difference is smaller than or equal to the first threshold, the refrigerant flows back to the suction port A of the compressor 106; when the difference is greater than the first threshold and less than the second threshold, the first valve body 1102 and the second valve body 1104 do not operate, the current refrigerant flow direction is maintained, and the problem that the service life of the first valve body 1102 and the service life of the second valve body 1104 are affected due to frequent switching of the refrigerant flow direction and the operation of the system is unstable is avoided.
The first valve body 1102 and the second valve body 1104 are members such as a solenoid valve, an electronic expansion valve, a thermostatic expansion valve, and a capillary tube.
In one embodiment, the compressor 106 further includes an exhaust port C, and the air conditioning system further includes:
and a pressure detection device 112 disposed at the exhaust port C, wherein the pressure detection device 112 is configured to detect an exhaust pressure of the compressor 106.
In one embodiment, the air conditioning system further comprises:
the temperature detecting device 114 is disposed at a second end of the first refrigerant flow path 1082, and the temperature detecting device 114 is configured to detect a temperature of the second end of the first refrigerant flow path 1082.
In this embodiment, the pressure detecting device 112 is disposed at the exhaust port C of the compressor 106, and in particular, may be disposed on a connection line between the exhaust port C of the compressor 106 and the four-way selector valve 126. The temperature detecting device 114 is disposed at the second end of the first refrigerant flow path 1082, and specifically, may be disposed on a connecting pipeline between the second end of the first refrigerant flow path 1082 and the indoor heat exchanger 104, for detecting a temperature of the connecting pipeline between the second end of the first refrigerant flow path 1082 and the indoor heat exchanger 104. The supercooling degree of the system is determined by the saturation temperature corresponding to the discharge pressure of the compressor 106 and the temperature detected by the temperature detection device 114, so that the first valve body 1102 and the second valve body 1104 are controlled to operate to switch the flow direction of the refrigerant to the suction port A or the injection port B, and the refrigeration capacity of the system is increased while the supercooling degree of the system is ensured.
In one embodiment, the air conditioning system further comprises:
the first throttling device 116 is disposed at a first end of the second refrigerant flow path 1084.
In one embodiment, the air conditioning system further comprises:
the second throttling device 118 is disposed at a first end of the first refrigerant flow path 1082.
In this embodiment, the second throttling device 118 is disposed at a first end of the first refrigerant flow path 1082, and the second throttling device 118 is used for adjusting the refrigerant flow rate of the first refrigerant flow path 1082. The first throttling device 116 is disposed at a first end of the second refrigerant flow path 1084, and the second refrigerant flow path 1084 is used for adjusting a refrigerant flow rate of the second refrigerant flow path 1084, so that the refrigerant in the second refrigerant flow path 1084 enters the first refrigerant flow path 1082, and absorbs heat from the refrigerant in the first refrigerant flow path 1082. The second throttling device 118 and the first throttling device 116 respectively adjust the flow rates of the refrigerants in the first refrigerant flow passage 1082 and the second refrigerant flow passage 1084, so as to improve the refrigeration effect.
The first throttle device 116 and the second throttle device 118 are solenoid valves, electronic expansion valves, thermostatic expansion valves, capillary tubes, and the like.
In one embodiment, the air conditioning system further comprises:
a first temperature sensor 120 disposed at a second end of the second refrigerant flow path 1084, the first temperature sensor 120 being configured to detect a temperature of the second end of the second refrigerant flow path 1084;
the second temperature sensor 122 is disposed at a first end of the second refrigerant passage 1084, and the second temperature sensor 122 is configured to detect a temperature of the first end of the second refrigerant passage 1084.
In this embodiment, the temperatures of the second end of the second refrigerant flow path 1084 and the first end of the second refrigerant flow path 1084 are respectively detected by the first temperature sensor 120 and the second temperature sensor 122, so as to obtain a difference between the temperature of the second end of the second refrigerant flow path 1084 and the temperature of the first end of the second refrigerant flow path 1084, and the first throttling device 116 is controlled according to the difference, so as to adjust the refrigerant flow rate of the second refrigerant flow path 1084. For example, when the difference is greater than or equal to the third threshold, which indicates that the superheat degree of the second refrigerant flow path 1084 is relatively large, the opening degree of the first throttling device 116 is increased to increase the refrigerant flow rate of the second refrigerant flow path 1084; when the difference is smaller than or equal to the fourth threshold, which indicates that the superheat degree of the second refrigerant flow path 1084 is small, the opening degree of the first throttling device 116 is decreased to decrease the refrigerant flow rate of the second refrigerant flow path 1084, and when the difference is smaller than the third threshold and larger than the fourth threshold, the first throttling device 116 is not operated, wherein the third threshold is larger than the fourth threshold.
In one embodiment, the air conditioning system further comprises:
a gas-liquid separator 124;
the four-way selector valve 126 and the four-way selector valve 126 are connected to the outdoor heat exchanger 102, the indoor heat exchanger 104, the gas-liquid separator 124, and the discharge port C of the compressor 106, respectively.
In this embodiment, compressor 106 is a vapor injection enthalpy compressor that includes a suction port A, an injection port B, and a discharge port C. The gas-liquid separator 124 is connected to the four-way reversing valve 126 and the suction port a of the compressor 106, one end of the first valve 1102 is connected to the second end of the second refrigerant flow path 1084, and the other end of the first valve 1102 may be directly connected to the suction port a of the compressor 106, or may be connected to the gas-liquid separator 124 and then connected to the suction port a of the compressor 106 via the gas-liquid separator 124.
In one embodiment, the air conditioning system further comprises:
a first cut-off valve 128 provided between the subcooler 108 and the indoor heat exchanger 104;
and a second cut-off valve 130 disposed between the four-way selector valve 126 and the indoor heat exchanger 104.
In this embodiment, a first cut-off valve 128 is disposed between the subcooler 108 and the indoor heat exchanger 104 for controlling the connection line between the subcooler 108 and the indoor heat exchanger 104 to be turned on or off. The second cut-off valve 130 is disposed between the four-way selector valve 126 and the indoor heat exchanger 104, and is configured to control connection and disconnection of a connection pipeline between the four-way selector valve 126 and the indoor heat exchanger 104.
In one embodiment, the air conditioning system further comprises:
a memory storing a computer program;
a processor which, when executing the computer program, implements:
the discharge pressure at the discharge port C of the compressor 106 and the temperature at the second end of the first refrigerant flow path 1082 are obtained, and a preset temperature corresponding to the discharge pressure, that is, a saturation temperature corresponding to the discharge pressure, is determined. Further calculating a difference value between the preset temperature and the temperature, judging the difference value, when the difference value is less than or equal to a first threshold value, indicating that the supercooling degree of the system is low, and at the moment, the supercooling degree of the system needs to be improved, controlling the first valve body 1102 to be opened and the second valve body 1104 to be closed so that the refrigerant flows to the air suction port A of the compressor 106 from the second end of the second refrigerant flow path 1084; when the difference is greater than or equal to the second threshold, indicating that the degree of subcooling of the system is high, the first valve body 1102 is controlled to close and the second valve body 1104 is controlled to open, so that the refrigerant flows from the second end of the second refrigerant flow path 1084 to the injection port B of the compressor 106, and the refrigeration capacity of the system is improved.
Wherein the memory and the processor may be connected by a bus or other means. The Processor may include one or more Processing units, and the Processor may be a Central Processing Unit (CPU), a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), or the like.
In the embodiment of the second aspect of the present invention, a control method of an air conditioning system is provided, which is used for the air conditioning system, and the control method of the air conditioning system is described in detail through fig. 2 to 4.
Fig. 2 is a flowchart illustrating a control method of an air conditioning system according to an embodiment of the present invention. The control method of the air conditioning system comprises the following steps:
and 204, controlling the switching part to act according to the exhaust pressure and the temperature so as to switch the flow direction of the refrigerant to a suction port of the compressor or an injection port of the compressor.
In this embodiment, the control pressure detecting device detects a discharge pressure of the compressor, and the control temperature detecting device detects a temperature of the second end of the first refrigerant flow path, which is a temperature of a connection pipe between the second end of the first refrigerant flow path and the indoor heat exchanger. Furthermore, the switching component is controlled according to the exhaust pressure and the temperature, so that the refrigerant flows back to the suction port of the compressor from the second end of the second refrigerant flow path or flows back to the injection port of the compressor from the second end of the second refrigerant flow path, and the refrigeration capacity of the system is increased while the supercooling degree of the system is ensured.
Further, controlling the switching member to act according to the exhaust pressure and the temperature specifically includes: determining a preset temperature corresponding to the exhaust pressure; and acquiring a difference value between the preset temperature and the temperature, and controlling the action of the switching component according to the difference value.
In this embodiment, after the discharge pressure of the compressor and the temperature of the second end of the first refrigerant flow path are detected, a preset temperature corresponding to the discharge pressure, that is, a saturation temperature corresponding to the discharge pressure, is determined, for example, by querying a correspondence relationship between the discharge pressure and the preset temperature stored in advance, a preset temperature corresponding to the discharge pressure is obtained. Further, the difference value between the preset temperature and the temperature is calculated, the difference value is the supercooling degree of the system, and then the action of the switching component is controlled according to the supercooling degree of the system. Specifically, when the supercooling degree of the system is low, the refrigerant of the second refrigerant flow path returns to the air suction port of the compressor, so that the problem of poor noise of the indoor unit can be avoided under the condition of ensuring the supercooling degree of the system. When the supercooling degree of the system is higher, the refrigerant of the second refrigerant flow path returns to the injection port of the compressor, namely flows back to the medium-pressure cavity of the compressor, so that the occupation of the suction volume of the compressor is reduced, and the refrigerating capacity is increased.
Fig. 3 is a flowchart illustrating a control method of an air conditioning system according to another embodiment of the present invention. The control method of the air conditioning system comprises the following steps:
In this embodiment, the opening or closing of the first valve body of the switching component and the second valve body of the switching component is controlled to switch the flow path from the refrigerant flowing out of the second end of the second refrigerant flow path to the suction port or the injection port, so that the supercooling degree of the system can be ensured, and the refrigerating capacity of the system can be increased.
Specifically, as shown in fig. 4, during cooling operation of the air conditioning system, the discharge pressure at the discharge port of the compressor is detected, and the temperature Tg of the second end of the first refrigerant flow path is detected. Further, the preset temperature Tc corresponding to the exhaust pressure is determined, and for example, the preset temperature Tc corresponding to the exhaust pressure is acquired by querying a correspondence relationship between the exhaust pressure stored in advance and the preset temperature Tc. Then calculating the difference value between the preset temperature Tc and the temperature Tg, judging the difference value, when the difference value is less than or equal to a first threshold value, indicating that the supercooling degree of the system is low, and at the moment, controlling the first valve body to be opened and the second valve body to be closed to enable the refrigerant to flow from the second end of the second refrigerant flow path to an air suction port of the compressor; when the difference value is larger than or equal to the second threshold value, the supercooling degree of the system is high, the first valve body is controlled to be closed, and the second valve body is controlled to be opened, so that the refrigerant flows to the injection port of the compressor from the second end of the second refrigerant flow path, and the refrigerating capacity of the system is improved.
When the difference value is greater than or equal to the second threshold value, the refrigerant flows back to the injection port of the compressor; when the difference is smaller than or equal to the first threshold value, the refrigerant flows back to the air suction port of the compressor; when the difference value is greater than the first threshold value and less than the second threshold value, the first valve body and the second valve body do not act, the current refrigerant flow direction is kept, the service life of the first valve body and the service life of the second valve body are prevented from being influenced by frequent switching of the refrigerant flow direction, and the system is unstable in operation.
In one embodiment, the control method of the air conditioning system further includes:
acquiring the temperature of the second end of the second refrigerant flow path and the temperature of the first end of the second refrigerant flow path; and controlling the first throttling device according to the difference between the temperature of the second end of the second refrigerant flow path and the temperature of the first end of the second refrigerant flow path, so as to accurately adjust the refrigerant flow of the second refrigerant flow path. Specifically, when the difference is greater than or equal to the third threshold, indicating that the superheat degree of the second refrigerant flow path is large, the opening degree of the first throttling device is increased to increase the refrigerant flow rate of the second refrigerant flow path; when the difference is smaller than or equal to a fourth threshold value, the superheat degree of the second refrigerant flow path is smaller, the opening degree of the first throttling device is reduced to reduce the refrigerant flow of the second refrigerant flow path, when the difference is smaller than a third threshold value and larger than the fourth threshold value, the first throttling device and the first throttling device do not act, and the third threshold value is larger than the fourth threshold value.
In an embodiment of the third aspect of the present invention, a computer-readable storage medium is provided, on which a computer program is stored, which, when executed by a processor, implements the control method of the air conditioning system of the first aspect of the present invention.
In the computer-readable storage medium provided by the present invention, when the computer program is executed by the processor, the steps of the control method for the air conditioning system according to the first embodiment are implemented, so that the computer-readable storage medium includes all the beneficial effects of the control method for the air conditioning system according to the first embodiment, and are not described herein again.
The computer-readable storage medium includes a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and the like.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. An air conditioning system, comprising:
an outdoor heat exchanger;
an indoor heat exchanger;
a compressor including a suction port and a jet port;
the subcooler comprises a first refrigerant flow path and a second refrigerant flow path, wherein the first end of the first refrigerant flow path is connected with the outdoor heat exchanger, and the second end of the first refrigerant flow path is respectively connected with the indoor heat exchanger and the first end of the second refrigerant flow path;
and the switching part is arranged between the second end of the second refrigerant flow path and the compressor and is used for switching the refrigerant flow direction to the suction port or the jet port.
2. The air conditioning system of claim 1, wherein the switching member comprises:
the first valve body is arranged between the second end of the second refrigerant flow path and the suction port;
a second valve body disposed between a second end of the second refrigerant flow path and the injection port,
the refrigerant flows from the second end of the second refrigerant flow path to the suction port when the first valve body is opened and the second valve body is closed, and flows from the second end of the second refrigerant flow path to the injection port when the first valve body is closed and the second valve body is opened.
3. The air conditioning system of claim 1 or 2, wherein the compressor further comprises a discharge port, the air conditioning system further comprising:
and the pressure detection device is arranged at the exhaust port and is used for detecting the exhaust pressure of the compressor.
4. The air conditioning system according to claim 1 or 2, further comprising:
and the temperature detection device is arranged at the second end of the first refrigerant flow path and is used for detecting the temperature of the second end of the first refrigerant flow path.
5. The air conditioning system according to claim 1 or 2, further comprising:
and the first throttling device is arranged at the first end of the second refrigerant flow path.
6. The air conditioning system according to claim 1 or 2, further comprising:
and the second throttling device is arranged at the first end of the first refrigerant flow path.
7. A control method for an air conditioning system, characterized by being used for the air conditioning system according to any one of claims 1 to 6, the control method comprising:
acquiring the exhaust pressure of the compressor and the temperature of the second end of the first refrigerant flow path;
and controlling the switching part to act according to the exhaust pressure and the temperature so as to switch the flow direction of the refrigerant to the suction port of the compressor or the injection port of the compressor.
8. The method of claim 7, wherein the controlling the switching component action based on the discharge pressure and the temperature specifically comprises:
determining a preset temperature corresponding to the exhaust pressure;
and acquiring a difference value between the preset temperature and the temperature, and controlling the switching component to act according to the difference value.
9. The method according to claim 8, wherein the controlling the switching member according to the difference specifically comprises:
controlling a first valve body of the switching component to be opened and a second valve body of the switching component to be closed based on the difference value being smaller than or equal to a first threshold value, so that the refrigerant flows from a second end of the second refrigerant flow path to the suction port;
and controlling the first valve body to be closed and the second valve body to be opened based on the difference value being greater than or equal to a second threshold value, so that the refrigerant flows from the second end of the second refrigerant flow path to the injection port, wherein the second threshold value is greater than the first threshold value.
10. A computer-readable storage medium on which a computer program is stored, the computer program, when being executed by a processor, implementing a control method of an air conditioning system according to any one of claims 7 to 9.
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Application publication date: 20220311 |