CN110762792B - Control method of air conditioner and air conditioner - Google Patents
Control method of air conditioner and air conditioner Download PDFInfo
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- CN110762792B CN110762792B CN201911036158.3A CN201911036158A CN110762792B CN 110762792 B CN110762792 B CN 110762792B CN 201911036158 A CN201911036158 A CN 201911036158A CN 110762792 B CN110762792 B CN 110762792B
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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
- F24F11/64—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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/54—Control or safety arrangements characterised by user interfaces or communication using one central controller connected to several sub-controllers
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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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- 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
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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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
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- Air Conditioning Control Device (AREA)
Abstract
The embodiment of the invention discloses a control method of an air conditioner and the air conditioner, wherein the air conditioner comprises N indoor units and M outdoor units, the N indoor units comprise at least one three-pipe indoor unit, and the three-pipe indoor unit comprises a first indoor heat exchanger, a first electronic expansion valve, a second indoor heat exchanger and a second electronic expansion valve; the outdoor unit comprises a gas-liquid separator, a compressor and a control valve; the air outlet of the compressor is connected with the first end of the control valve, the second end of the control valve is connected with one end of the third pipeline, and the third end of the control valve is connected with the air suction port of the gas-liquid separator; the other end of the third pipeline is connected with one end of a first indoor heat exchanger, the other end of the first indoor heat exchanger is connected with one end of a first electronic expansion valve, and the other end of the first electronic expansion valve is connected with one end of a liquid pipe and also connected with one end of a second electronic expansion valve; the other end of the second electronic expansion valve is connected with one end of a second indoor heat exchanger, and the other end of the second indoor heat exchanger is connected with one end of an air pipe.
Description
Technical Field
The embodiment of the invention relates to the technical field of air conditioners, in particular to an air conditioner and a control method thereof.
Background
At present, when the air conditioner operates in a cooling mode in a high-temperature environment, because the outdoor temperature is high, the gaseous refrigerant in the outdoor heat exchanger is difficult to condense, redundant gaseous refrigerant can be accumulated in the outdoor heat exchanger and the indoor heat exchanger, and because no extra space is arranged in the air conditioner for storing the refrigerant, the refrigerant of the air conditioner is excessive, so that the high-pressure is increased along with the rise of the outdoor temperature. When the high pressure exceeds the allowable operation range of the compressor, the air conditioner starts the high pressure protection function. For example, a fixed speed air conditioner may control shut down for high pressure protection; the variable-frequency air conditioner can reduce the operating frequency of the compressor until the operating frequency is reduced to the lowest operating frequency allowed by the compressor, and the shutdown is controlled to carry out high-voltage protection.
However, whether the air conditioner is controlled to stop or the operation frequency of the compressor is reduced, the cooling effect of the air conditioner is deteriorated, and the cooling capacity required by a user in a high-temperature environment is increased, so that the air conditioner cannot meet the cooling requirement in the high-temperature environment.
Disclosure of Invention
The invention provides a control method of an air conditioner and the air conditioner, and solves the problem that the air conditioner is poor in refrigerating effect when running in a high-temperature environment.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides an air conditioner, which may include: n indoor units and M outdoor units, wherein N and M are integers greater than or equal to 1; wherein, N indoor sets include at least one three control indoor sets, and three control indoor sets include: the system comprises a first indoor heat exchanger, a first electronic expansion valve, a second indoor heat exchanger and a second electronic expansion valve; the outdoor unit includes: the system comprises a first four-way valve, a gas-liquid separator, a compressor and a control valve. The air outlet of the compressor is connected with the first end of the control valve, the second end of the control valve is connected with one end of the third pipeline, and the third end of the control valve is connected with the air suction port of the gas-liquid separator; the other end of the third pipeline is connected with one end of a first indoor heat exchanger, the other end of the first indoor heat exchanger is connected with one end of a first electronic expansion valve, and the other end of the first electronic expansion valve is connected with one end of a liquid pipe and also connected with one end of a second electronic expansion valve; the other end of the second electronic expansion valve is connected with one end of a second indoor heat exchanger, and the other end of the second indoor heat exchanger is connected with one end of an air pipe; the other end of the air pipe is connected with a first four-way valve.
With reference to the first aspect, in one possible implementation manner, the control valve includes: a first electrically controlled valve and a second electrically controlled valve; one end of the first electric control valve is a first end of the control valve, and the other end of the first electric control valve is connected with one end of the second electric control valve and is a second end of the control valve; the other end of the second electric control valve is a third end of the control valve.
With reference to the first aspect and the possible implementation manners described above, in another possible implementation manner, the first electronic control valve and the second electronic control valve are a first electromagnetic valve and a second electromagnetic valve, respectively; or the first electric control valve and the second electric control valve are respectively a third electronic expansion valve and a fourth electronic expansion valve.
With reference to the first aspect and the possible implementations described above, in another possible implementation, the control valve is a second four-way valve; the exhaust end of the second four-way valve is a first end of the control valve, the condensation end of the second four-way valve is a second end of the control valve, the air suction end of the second four-way valve is a third end of the control valve, and the evaporation end of the second four-way valve is suspended.
In a second aspect, a control method for an air conditioner is provided, which is applied to the air conditioner of the first aspect or any one of the possible implementation manners of the first aspect. The method can comprise the following steps: under the condition of operating the refrigeration mode, when the high-pressure is determined to be greater than a refrigeration first preset value, the low-pressure is determined to be greater than a refrigeration second preset value, and the exhaust temperature of the compressor is determined to be less than a refrigeration first preset temperature value, the third pipeline and the first indoor heat exchanger are controlled to be in a high-pressure state so as to store the refrigerant; otherwise, the third pipeline and the first indoor heat exchanger are controlled to be in a low-pressure state.
With reference to the second aspect, in one possible implementation, when the control valve includes: during first electric control valve and second electric control valve, control third pipeline and first indoor heat exchanger be high pressure state, include: controlling the first electronic expansion valve to be closed, controlling the first electronic control valve to be opened, and controlling the second electronic control valve to be closed; control third pipeline and first indoor heat exchanger be low pressure state, include: and controlling the first electronic expansion valve to be opened, controlling the first electronic control valve to be closed, and controlling the second electronic control valve to be opened.
With reference to the second aspect and the foregoing possible implementation manners, in another possible implementation manner, after the controlling the first electronically controlled valve to be opened and the controlling the second electronically controlled valve to be closed, the method further includes: and when the high-pressure is determined to be smaller than a third refrigeration preset value, the low-pressure is determined to be smaller than a fourth refrigeration preset value, and the exhaust temperature of the compressor is determined to be larger than a second refrigeration preset temperature value, keeping the first electronic control valve open, keeping the second electronic control valve closed, and controlling the first electronic expansion valve to open.
With reference to the second aspect and the foregoing possible implementation manners, in another possible implementation manner, after the keeping the first electronic control valve open, the keeping the second electronic control valve closed, and the controlling the first electronic expansion valve to open, the method further includes: and when determining that the high pressure is not satisfied with at least one of the fifth preset value of refrigeration, the sixth preset value of refrigeration and the exhaust temperature of the compressor is lower than the third preset temperature value of refrigeration, controlling the first electronic control valve to close, keeping the second electronic control valve closed, and controlling the first electronic expansion valve to close.
With reference to the second aspect and the foregoing possible implementation manners, in another possible implementation manner, the method further includes: under the condition of operating the heating mode, when the high-pressure is determined to be smaller than a first heating preset value, the low-pressure is determined to be smaller than a second heating preset value, and the exhaust temperature of the compressor is determined to be larger than a first heating preset temperature value, the third pipeline and the first indoor heat exchanger are controlled to be in a low-pressure state, so that refrigerants in the third pipeline and the first indoor heat exchanger are led out; otherwise, the third pipeline and the first indoor heat exchanger are controlled to be in a high-pressure state.
With reference to the second aspect and the possible implementations described above, in another possible implementation, the control valve includes: during first electric control valve and second electric control valve, control third pipeline and first indoor heat exchanger and be the low pressure state, include: controlling the first electronic expansion valve to be closed, controlling the first electronic control valve to be closed, and controlling the second electronic control valve to be opened; control third pipeline and first indoor heat exchanger be high pressure state, include: and controlling the first electronic expansion valve to open, controlling the first electronic control valve to open, and controlling the second electronic control valve to close.
With reference to the second aspect and the foregoing possible implementation manners, in another possible implementation manner, after the controlling the first electrically-controlled valve to be closed and the controlling the second electrically-controlled valve to be opened, the method further includes: and when the high-pressure is determined to be greater than a third heating preset value, the low-pressure is determined to be greater than a fourth heating preset value, and the exhaust temperature of the compressor is determined to be less than a second heating preset temperature value, the first electronic control valve is kept closed, the second electronic control valve is controlled to be closed, and the first electronic expansion valve is controlled to be opened.
With reference to the second aspect and the foregoing possible implementation manners, in another possible implementation manner, after keeping the first electronic control valve closed, controlling the second electronic control valve to close, and controlling the first electronic expansion valve to open, the method further includes: and when determining that the high pressure is not satisfied with at least one of the fifth heating preset value and the sixth heating preset value, the low pressure is smaller than the sixth heating preset value, and the exhaust temperature of the compressor is greater than the third heating preset temperature value, keeping the first electronic control valve closed, keeping the second electronic control valve closed, and controlling the first electronic expansion valve to be closed.
In a third aspect, an air conditioner is provided, which may include: a determination unit and a control unit. The determining unit is used for determining that the high-pressure is greater than a first refrigeration preset value, the low-pressure is greater than a second refrigeration preset value and the exhaust temperature of the compressor is less than a first refrigeration preset temperature value under the condition of operating the refrigeration mode; the control unit is used for controlling the third pipeline and the first indoor heat exchanger to be in a high-pressure state to store the refrigerant when the determining unit determines that the high-pressure is greater than a first refrigeration preset value, the low-pressure is greater than a second refrigeration preset value, and the exhaust temperature of the compressor is less than a first refrigeration preset temperature value; otherwise, the third pipeline and the first indoor heat exchanger are controlled to be in a low-pressure state.
With reference to the third aspect, in one possible implementation, when the control valve includes: the control unit is specifically configured to: controlling the first electronic expansion valve to be closed, controlling the first electronic control valve to be opened, and controlling the second electronic control valve to be closed; or controlling the first electronic expansion valve to be opened, controlling the first electronic control valve to be closed, and controlling the second electronic control valve to be opened.
With reference to the third aspect and the foregoing possible implementation manners, in another possible implementation manner, the control unit is further configured to, when it is determined that the high-pressure is smaller than a third preset refrigeration value, the low-pressure is smaller than a fourth preset refrigeration value, and the discharge temperature of the compressor is greater than a second preset refrigeration temperature value, keep the first electronic control valve open, keep the second electronic control valve closed, and control the first electronic expansion valve to open.
With reference to the third aspect and the foregoing possible implementation manners, in another possible implementation manner, when it is determined that at least one of the high-pressure that is greater than the fifth preset refrigeration value, the low-pressure that is greater than the sixth preset refrigeration value, and the discharge temperature of the compressor that is less than the third preset refrigeration temperature value is not satisfied, the first electronic control valve is controlled to close, the second electronic control valve is kept closed, and the first electronic expansion valve is controlled to close.
With reference to the third aspect and the foregoing possible implementation manners, in another possible implementation manner, the control unit is further configured to: under the condition of operating the heating mode, when the high-pressure is determined to be smaller than a first heating preset value, the low-pressure is determined to be smaller than a second heating preset value, and the exhaust temperature of the compressor is determined to be larger than a first heating preset temperature value, the third pipeline and the first indoor heat exchanger are controlled to be in a low-pressure state, so that refrigerants in the third pipeline and the first indoor heat exchanger are led out; otherwise, the third pipeline and the first indoor heat exchanger are controlled to be in a high-pressure state.
With reference to the third aspect and the possible implementations described above, in another possible implementation, when the control valve includes: the control unit is specifically configured to: controlling the first electronic expansion valve to be closed, controlling the first electronic control valve to be closed, and controlling the second electronic control valve to be opened; or controlling the first electronic expansion valve to open, controlling the first electronic control valve to open, and controlling the second electronic control valve to close.
With reference to the third aspect and the foregoing possible implementation manners, in another possible implementation manner, the control unit is further configured to: and when the high-pressure is determined to be greater than a third heating preset value, the low-pressure is determined to be greater than a fourth heating preset value, and the exhaust temperature of the compressor is determined to be less than a second heating preset temperature value, the first electronic control valve is kept closed, the second electronic control valve is controlled to be closed, and the first electronic expansion valve is controlled to be opened.
With reference to the third aspect and the foregoing possible implementation manners, in another possible implementation manner, the control unit is further configured to, when it is determined that at least one of the high-pressure that is less than the fifth preset heating value, the low-pressure that is less than the sixth preset heating value, and the discharge temperature of the compressor that is greater than the third preset heating temperature value is not satisfied, keep the first electronic control valve closed, keep the second electronic control valve closed, and control the first electronic expansion valve to close.
Specific implementation manners may refer to the second aspect or the possible implementation manners of the second aspect, and the behavior function of the air conditioner in the control method of the air conditioner.
In a fourth aspect, an air conditioner is provided, which includes: a processor; when the air conditioner is running, the processor executes the computer-executable instructions to cause the air conditioner to perform the control method of the air conditioner as set forth in the second aspect or any one of the possible implementations of the second aspect.
In a fifth aspect, there is provided a computer storage medium having stored thereon computer-executable instructions that, when executed on an air conditioner, cause the air conditioner to perform the method of controlling the air conditioner as in the second aspect or any one of the possible implementations of the second aspect.
According to the control method of the air conditioner, under the condition that the refrigeration mode is operated, when the high-pressure is larger than the refrigeration first preset value, the low-pressure is larger than the refrigeration second preset value and the exhaust temperature of the compressor is smaller than the refrigeration first preset temperature value, the air conditioner is indicated to operate in a high-temperature environment, the condensation pressure is too high, at the moment, the third pipeline and the first indoor heat exchanger are controlled to be in a high-pressure state, so that the third pipeline and the first indoor heat exchanger store a part of refrigerant, the refrigerant pressure of other loops is reduced, and the refrigeration effect is guaranteed.
Drawings
Fig. 1 is a schematic diagram illustrating an air conditioner according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of another air conditioner according to an embodiment of the present invention;
FIG. 2a is a schematic diagram of another air conditioner according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating a control method of an air conditioner according to an embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating a cycle of a refrigerant for high-temperature refrigeration according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a cycle of a refrigerant during full refrigeration according to an embodiment of the present invention;
fig. 6 is a flowchart illustrating another control method of an air conditioner according to an embodiment of the present invention;
fig. 7 is a schematic diagram illustrating a cycle of a refrigerant for heating at a low temperature according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a refrigerant cycle during heating only according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of another air conditioner according to an embodiment of the present invention;
fig. 10 is a schematic diagram of another air conditioner according to an embodiment of the present invention.
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.
In order to solve the problem that the air conditioner has poor refrigeration effect when operating in a high-temperature environment, an embodiment of the present invention provides an air conditioner, which may include: n indoor units and M outdoor units, wherein N and M are integers greater than or equal to 1.
Wherein, N indoor sets include at least one three control indoor sets, and three control indoor sets can include: two indoor heat exchangers and an electronic expansion valve used for controlling the flow and the on-off of the refrigerant on each indoor heat exchanger loop. The outdoor unit is a three-pipe outdoor unit, which may include: the system comprises an outdoor heat exchanger, an outdoor electronic expansion valve, a first four-way valve, a gas-liquid separator, a compressor, a high-pressure sensor, a low-pressure sensor and a control valve.
Each three-pipe indoor unit is connected with the outdoor unit through an air pipe, a liquid pipe and a third pipeline, and the air pipe, the liquid pipe and the third pipeline of all the outdoor units are correspondingly connected.
Optionally, the N indoor units may further include at least one common indoor unit, and the common indoor unit may include: an indoor heat exchanger and an electronic expansion valve. Each common indoor unit is connected with the outdoor unit through an air pipe and a liquid pipe.
In order to facilitate understanding of those skilled in the art, in fig. 1, N is 2, and M is 1, that is, the air conditioner includes an outdoor unit and two indoor units, and the two indoor units are both three-pipe indoor units as an example.
As shown in fig. 1, the outdoor side of the air conditioner includes an outdoor unit, which may include: an outdoor heat exchanger 11, an outdoor electronic expansion valve 12, a first four-way valve 13, a gas-liquid separator 14, a compressor 15, a high-pressure sensor 16, a low-pressure sensor 17 and a control valve 18. The indoor side of the air conditioner comprises two three-pipe indoor units, and each three-pipe indoor unit can comprise: a first indoor heat exchanger 21, a first electronic expansion valve 22, a second indoor heat exchanger 23, and a second electronic expansion valve 24.
Wherein, the gas outlet of the compressor 15 is connected with the first end of the control valve 18, the second end of the control valve 18 is connected with one end of the third pipeline, and the third end of the control valve 18 is connected with the gas suction port of the gas-liquid separator 14.
The other end of the third pipeline is connected with one end of the first indoor heat exchanger 21, the other end of the first indoor heat exchanger 21 is connected with one end of the first electronic expansion valve 22, the other end of the first electronic expansion valve 22 is connected with one end of the liquid pipe, and is also connected with one end of the second electronic expansion valve 24.
The other end of the liquid pipe is connected with one end of the outdoor electronic expansion valve 12.
The other end of the second electronic expansion valve 24 is connected with one end of the second indoor heat exchanger 23, and the other end of the second indoor heat exchanger 23 is connected with one end of the air pipe; the other end of the air pipe is connected to the evaporation end (end E) of the first four-way valve 13.
The suction port of the compressor 15 is connected to a low pressure sensor 17, and the outlet port of the compressor 15 is connected to a high pressure sensor 16.
Further, in an embodiment of the present invention, the control valve may include a first electrically controlled valve and a second electrically controlled valve. One end of the first electric control valve is a first end of the control valve, and the other end of the first electric control valve is connected with one end of the second electric control valve and is a second end of the control valve; the other end of the second electric control valve is a third end of the control valve.
And the first and second electrically controlled valves may be first and second solenoid valves, respectively. Alternatively, the first and second electronic control valves may be a third electronic expansion valve and a fourth electronic expansion valve, respectively. As shown in fig. 2, the first electric control valve and the second electric control valve are respectively a first electromagnetic valve and a second electromagnetic valve, and the first electromagnetic valve is W1 and the second electromagnetic valve is W2 in fig. 2.
Further, in the embodiment of the present invention, the control valve may be a second four-way valve. Wherein, the exhaust end (D end) of the second four-way valve is the first end of the control valve, the evaporation end (E end) of the second four-way valve is the second end of the control valve, the suction end (S end) of the second four-way valve is the third end of the control valve, and the condensation end (C end) of the second four-way valve is suspended, as shown in fig. 2 a.
Fig. 3 is a flowchart of a control method of an air conditioner according to an embodiment of the present invention, where the method is applied to a cooling process of any one of the air conditioners shown in fig. 1, 2, and 2 a. As shown in fig. 3, the method may include:
301. and under the condition of operating the refrigeration mode, when the high-pressure is determined to be greater than a refrigeration first preset value, the low-pressure is determined to be greater than a refrigeration second preset value, and the exhaust temperature of the compressor is determined to be less than a refrigeration first preset temperature value, controlling the third pipeline and the first indoor heat exchanger to be in a high-pressure state.
When the control panel of the air conditioner operates in the refrigeration mode, the high-pressure is determined to be greater than a refrigeration first preset value, the low-pressure is determined to be greater than a refrigeration second preset value, and the exhaust temperature of the compressor is determined to be less than a refrigeration first preset temperature value, the air conditioner operates in a high-temperature environment, and the high-pressure is high. At this time, the air conditioner may control the third pipeline and the first indoor heat exchanger to be in a high-pressure state to store the refrigerant and reduce the refrigerant pressure of other circuits. Specifically, when the control valve of the outdoor unit includes a first electronic control valve and a second electronic control valve, the control panel of the air conditioner may control the first electronic expansion valve to close, control the first electronic control valve to open, and control the second electronic control valve to close. At this time, the second electronic expansion valve throttles and reduces the pressure, the outdoor heat exchanger is a condenser, the first indoor heat exchanger is a condenser, the second indoor heat exchanger is an evaporator, and based on fig. 2, as shown in fig. 4, the circulation process of the refrigerant in the air conditioner is as follows:
the high-pressure gaseous refrigerant discharged from the air outlet of the compressor is divided into two parts, the first part passes through the first four-way valve, is condensed by the outdoor heat exchanger to become high-pressure liquid refrigerant, and then enters each indoor unit through the outdoor electronic expansion valve and the liquid pipe. Because the first electronic expansion valve is closed, the first high-pressure liquid refrigerant enters the gas-liquid separator after passing through the second electronic expansion valve, the second indoor heat exchanger, the gas pipe and the first four-way valve, and enters the suction port of the compressor after gas-liquid separation. The second strand passes through the first electromagnetic valve, passes through the third pipeline and the first indoor heat exchanger, and because the first electronic expansion valve is closed, the refrigerant can be condensed in the third pipeline and the first indoor heat exchanger at the moment, so that the refrigerant in the system can be stored in the third pipeline and the first indoor heat exchanger, the refrigerant quantity in the first strand of refrigerant circulation is reduced, the high-pressure of the system operation is reduced, and the refrigeration effect under the high-temperature environment is improved.
302. Otherwise, the third pipeline and the first indoor heat exchanger are controlled to be in a low-pressure state.
Wherein, the control panel of the air conditioner does not satisfy: when the high-pressure is greater than at least one of the first refrigeration preset value, the low-pressure is greater than the second refrigeration preset value and the exhaust temperature of the compressor is less than the first refrigeration preset temperature value, the normal refrigeration is indicated, and at the moment, the air conditioner can control the third pipeline and the first indoor heat exchanger to be in a low-pressure state. Specifically, when the control valve of the outdoor unit includes a first electronic control valve and a second electronic control valve, the control panel of the air conditioner may control the first electronic expansion valve to open, control the first electronic control valve to close, and control the second electronic control valve to open. At this time, the first electronic expansion valve and the second electronic expansion valve throttle and reduce the pressure, the outdoor heat exchanger is a condenser, the first indoor heat exchanger and the second indoor heat exchanger are both evaporators, and based on fig. 2, as shown in fig. 5, the circulation process of the refrigerant in the air conditioner is as follows:
the high-pressure gaseous refrigerant discharged from the air outlet of the compressor passes through the first four-way valve, is condensed by the outdoor heat exchanger to become high-pressure liquid refrigerant, and enters each three-pipe indoor unit after passing through the outdoor electronic expansion valve and the liquid pipe. Then the refrigerant is divided into two streams of refrigerants respectively, wherein the first stream of refrigerant flows through a second electronic expansion valve, a second indoor heat exchanger, a gas pipe and a first four-way valve in sequence, and then enters a suction port of a compressor after gas-liquid separation; the second refrigerant flows through the first electronic expansion valve, the first indoor heat exchanger, the third pipeline and the second electromagnetic valve in sequence, and then enters the air suction port of the compressor after gas-liquid separation.
According to the control method of the air conditioner, under the condition that the refrigeration mode is operated, when the high-pressure is larger than the refrigeration first preset value, the low-pressure is larger than the refrigeration second preset value and the exhaust temperature of the compressor is smaller than the refrigeration first preset temperature value, the air conditioner is indicated to operate in a high-temperature environment, the condensation pressure is too high, at the moment, the third pipeline and the first indoor heat exchanger are controlled to be in a high-pressure state, so that the third pipeline and the first indoor heat exchanger store a part of refrigerant, the refrigerant pressure of other loops is reduced, and the refrigeration effect is guaranteed.
Further, after the air conditioner controls the third pipe and the first indoor heat exchanger to be in a high pressure state in step 301, that is, after the refrigerant is stored, if the stored refrigerant is excessive, the high pressure and the low pressure may be too low, and the discharge temperature may be too high. At this time, when it is determined that the high-pressure is smaller than the third refrigeration preset value, the low-pressure is smaller than the fourth refrigeration preset value, and the discharge temperature of the compressor is greater than the second refrigeration preset temperature value, the air conditioner may keep the first electronic control valve open, keep the second electronic control valve closed, and control the first electronic expansion valve to open, so as to derive part of the refrigerant in the third pipeline and the first indoor heat exchanger, thereby increasing the high-pressure. After the third line and a part of the refrigerant in the first indoor heat exchanger are led out, if the refrigerant in the circulating system is excessive, the high pressure and the low pressure are caused to rise again, and the exhaust temperature is reduced again. At this time, when it is determined that the high-pressure is greater than the fifth refrigeration preset value, the low-pressure is greater than the sixth refrigeration preset value, and the discharge temperature of the compressor is less than the third refrigeration preset temperature value, the air conditioner may execute the control of the third pipeline and the first indoor heat exchanger in the step 301 to be in the high-pressure state, so as to store the refrigerant. Otherwise, controlling the first electric control valve to close, keeping the second electric control valve closed, controlling the first electronic expansion valve to close, and ending the adjustment of the refrigerant quantity in the pipeline. In this way, the amount of the refrigerant in the circulating system can be kept in a proper range by adjusting the refrigerant in the circulating system for a plurality of times, so that the refrigerating effect is ensured.
It should be noted that the fifth refrigeration preset value is smaller than the first refrigeration preset value, the sixth refrigeration preset value is smaller than the second refrigeration preset value, and the third refrigeration preset temperature value is greater than the first refrigeration preset temperature value, that is, the first storage of the refrigerant is performed in a rapid state when the high pressure is too high, the adjustment force is large to avoid high-pressure shutdown, the second storage of the refrigerant is performed in a gentle state when the high pressure is too high, and the adjustment force is smaller than the first adjustment force. By such a hierarchical adjustment, the amount of refrigerant in the circulation system can be maintained in a suitable range with high accuracy.
When the air conditioner heats in a low-temperature environment in the prior art, the refrigerant with lower indoor temperature is easy to condense into liquid refrigerant, so that more refrigerant is stored in the indoor heat exchanger, the outdoor temperature is lower, the liquid refrigerant is difficult to evaporate into gas, more refrigerant can be stored, the high-pressure is reduced along with the reduction of the outdoor temperature, and the heating effect is extremely poor. Therefore, in order to solve the problem that the heating effect is poor when the air conditioner operates in a low-temperature environment, the embodiment of the invention provides a control method of the air conditioner during heating. As shown in fig. 6, the method may include:
401. and under the condition of operating the heating mode, when the high-pressure is determined to be smaller than a first heating preset value, the low-pressure is determined to be smaller than a second heating preset value, and the exhaust temperature of the compressor is determined to be larger than a first heating preset temperature value, the third pipeline and the first indoor heat exchanger are controlled to be in a low-pressure state.
When the control panel of the air conditioner operates in the heating mode, when the high-pressure is determined to be smaller than a first heating preset value, the low-pressure is determined to be smaller than a second heating preset value, and the exhaust temperature of the compressor is greater than a first heating preset temperature value, the fact that the air conditioner continuously operates in a low-temperature environment is indicated, and the high-pressure is low. At this time, the air conditioner can control the third pipeline and the first indoor heat exchanger to be in a low-pressure state so as to lead out the refrigerant in the third pipeline and the first indoor heat exchanger and supplement the refrigerant to the refrigerant circulation of other pipelines, so that the amount of the refrigerant in other pipelines is increased. Specifically, when the control valve of the outdoor unit includes a first electronic control valve and a second electronic control valve, the air conditioner may control the first electronic expansion valve to close, control the first electronic control valve to close, and control the second electronic control valve to open. At this time, the outdoor heat exchanger is an evaporator, the first indoor heat exchanger is an evaporator, and the second indoor heat exchanger is a condenser, based on fig. 2, as shown in fig. 7, a cycle process of the refrigerant in the air conditioner is as follows:
the high-pressure gaseous refrigerant discharged from the air outlet of the compressor passes through the first four-way valve, passes through the air pipe and then enters the indoor unit. After passing through the second indoor heat exchanger, the refrigerant is condensed into liquid refrigerant by the second electronic expansion valve, and then the liquid refrigerant passes through the liquid pipe and the outdoor electronic expansion valve and is evaporated into low-pressure gaseous refrigerant by the outdoor heat exchanger. Then enters a gas-liquid separator through the first four-way valve, and enters a suction port of the compressor after gas-liquid separation. At the moment, the second electromagnetic valve is in an open state, the first electronic expansion valve is in a closed state, the third pipeline and the first indoor heat exchanger are in a low-pressure state, the part of the refrigerant can be pumped out and enters the gas-liquid separator for gas-liquid separation, so that the refrigerant quantity in the refrigerant circulation of other pipelines is increased, the high-pressure of the system operation is improved, and the heating effect in a low-temperature environment is improved.
402. Otherwise, the third pipeline and the first indoor heat exchanger are controlled to be in a high-pressure state.
Wherein, the control panel of the air conditioner does not satisfy: when the high-pressure is less than at least one of the first heating preset value, the low-pressure is less than the second heating preset value and the exhaust temperature of the compressor is greater than the first heating preset temperature value, the normal heating is indicated, and at the moment, the air conditioner can control the third pipeline and the first indoor heat exchanger to be in a high-pressure state. Specifically, when the control valve of the outdoor unit includes a first electronic control valve and a second electronic control valve, the air conditioner may control the first electronic expansion valve to open, control the first electronic control valve to open, and control the second electronic control valve to close. At this time, the outdoor heat exchanger is an evaporator, and both the first indoor heat exchanger and the second indoor heat exchanger are condensers, and based on fig. 2, as shown in fig. 8, a cycle process of the refrigerant in the air conditioner is as follows:
the high-pressure gaseous refrigerant discharged from the air outlet of the compressor is divided into two strands, wherein the first strand passes through the first four-way valve, enters the indoor unit through the air pipe, passes through the second indoor heat exchanger and the second electronic expansion valve and is condensed into liquid; the second refrigerant passes through the first electromagnetic valve and the third pipeline, is condensed into liquid by the first indoor heat exchanger and the first electronic expansion valve, then two liquid refrigerants are converged, pass through the liquid pipe and the outdoor electronic expansion valve, are evaporated into low-pressure gaseous refrigerant by the outdoor heat exchanger, enter the gas-liquid separator, are subjected to gas-liquid separation and then enter the air suction port of the compressor.
Therefore, under the condition of operating the heating mode, when the high-pressure is determined to be smaller than the first heating preset value and the low-pressure is determined to be smaller than the second heating preset value and the exhaust temperature of the compressor is greater than the first heating preset temperature value, the fact that the air conditioner operates in the low-temperature environment is indicated, the high-pressure is too low, at the moment, partial refrigerants stored in the third pipeline and the first indoor heat exchanger are led out by controlling the third pipeline and the first indoor heat exchanger to be in the low-pressure state, the refrigerant quantity in refrigerant circulation of other pipelines is increased, the system operation high-pressure is improved, and the heating effect in the low-temperature environment is improved.
Further, after the air conditioner controls the third pipeline and the first indoor heat exchanger to be in a low-pressure state in step 401, that is, after the refrigerant in the third pipeline and the first indoor heat exchanger is led out, if too much refrigerant is led out, the high-pressure and the low-pressure are too high, and the exhaust temperature is too low. At this time, when it is determined that the high-pressure is greater than the third heating preset value, the low-pressure is greater than the fourth heating preset value, and the exhaust temperature of the compressor is less than the second heating preset temperature value, the air conditioner keeps the first electronic control valve closed, controls the second electronic control valve to close, and controls the first electronic expansion valve to open, so that the refrigerant is introduced into the third pipeline and the first indoor heat exchanger, and the high-pressure is reduced. After storing the refrigerant, if the refrigerant in the circulation system is too low, the high pressure and the low pressure are again too low, and the discharge temperature is too high. At this time, when it is determined that the high-pressure is less than the fifth heating preset value, the low-pressure is less than the sixth heating preset value, and the discharge temperature of the compressor is greater than the third heating preset temperature value, the air conditioner may execute the step 401 of controlling the third pipeline and the first indoor heat exchanger to be in the low-pressure state to derive the refrigerant. Otherwise, keeping the first electric control valve closed, keeping the second electric control valve closed, controlling the first electronic expansion valve closed, and ending the adjustment of the refrigerant quantity in the pipeline. In this way, the amount of the refrigerant in the circulation system can be kept in a proper range by adjusting the refrigerant in the circulation system for a plurality of times, thereby ensuring the heating effect.
It should be noted that the fifth heating preset value is greater than the first heating preset value, the sixth heating preset value is greater than the second heating preset value, and the third heating preset temperature value is less than the first heating preset temperature value, that is, the first derivation of the refrigerant is an adjustment in a rapid state when the high pressure is too low, the adjustment force is large to avoid low-pressure shutdown, the second derivation of the refrigerant is an adjustment in a gentle state when the high pressure is low, and the adjustment force is less than the first adjustment force. By such a hierarchical adjustment, the amount of refrigerant in the circulation system can be maintained in a suitable range with high accuracy.
In addition, in the above embodiments, the control method of the air conditioner is described by taking an example in which the control valve includes the first electronic control valve and the second electronic control valve. The description of the control valve being the second four-way valve is similar to the specific description of the control valve including the first electric control valve and the second electric control valve, and is not repeated here.
The scheme provided by the embodiment of the invention is mainly introduced from the perspective of an air conditioner. It is understood that the air conditioner includes hardware structures and/or software modules corresponding to the respective functions in order to implement the above-described functions. Those of skill in the art will readily appreciate that the present invention can be implemented in hardware or a combination of hardware and computer software, in conjunction with the exemplary algorithm steps described in connection with the embodiments disclosed herein. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The embodiment of the present invention may perform the division of the functional modules for the air conditioner according to the method example, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. It should be noted that, the division of the modules in the embodiment of the present invention is schematic, and is only a logic function division, and there may be another division manner in actual implementation.
In the case of dividing each function module according to each function, fig. 9 shows a possible composition diagram of the air conditioner related to the above embodiment, and as shown in fig. 9, the air conditioner may include: a determination unit 51 and a control unit 52.
The determining unit 51 is configured to support the air conditioner to execute the method for controlling the air conditioner shown in fig. 3, where the high-pressure is determined to be greater than the first preset cooling value, the low-pressure is determined to be greater than the second preset cooling value, and the discharge temperature of the compressor is less than the first preset cooling value, and the high-pressure is determined to be less than the first preset heating value, the low-pressure is determined to be less than the second preset heating value, and the discharge temperature of the compressor is greater than the first preset heating value in step 401 of the method for controlling the air conditioner shown in fig. 6.
A control unit 52, configured to support the air conditioner to perform step 302 of controlling the third pipeline and the first indoor heat exchanger to be in a high-pressure state in step 301 in the control method of the air conditioner shown in fig. 3, and step 402 of controlling the third pipeline and the first indoor heat exchanger to be in a low-pressure state in step 401 in the control method of the air conditioner shown in fig. 6.
It should be noted that all relevant contents of each step related to the above method embodiment may be referred to the functional description of the corresponding functional module, and are not described herein again.
Fig. 10 is a schematic composition diagram of another air conditioner according to an embodiment of the present invention, and as shown in fig. 10, the air conditioner may include: the processor 61 is configured to perform the steps in fig. 3 and fig. 6, and specifically, the processor 61 may be a control board of an air conditioner.
In an embodiment of the present invention, the air conditioner may further include: memory 62 for storing computer-executable instructions and data. The memory 62 may be separate or integrated with the processor 61. And the memory 62 is coupled to the processor 61, the processor 61 can perform various functions of the air conditioner by calling and executing computer-executable instructions stored in the memory 62 and calling data in the memory 62. Of course, the air conditioner may further include other discrete devices, which is not specifically limited in this embodiment of the present invention.
The embodiment of the present invention further provides a computer storage medium, where the computer storage medium includes computer execution instructions, and when the computer execution instructions are executed on the air conditioner, the air conditioner is caused to perform the steps in the above method embodiments.
Through the above description of the embodiments, it is clear to those skilled in the art that, for convenience and simplicity of description, the foregoing division of the functional modules is merely used as an example, and in practical applications, the above function distribution may be completed by different functional modules according to needs, that is, the internal structure of the device may be divided into different functional modules to complete all or part of the above described functions.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described device embodiments are merely illustrative, and for example, the division of the modules or units is only one logical functional division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or may be integrated into another device, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may be one physical unit or a plurality of physical units, that is, may be located in one place, or may be distributed in a plurality of different places. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a readable storage medium. Based on such understanding, the technical solution of the embodiments of the present invention may be essentially or partially contributed to by the prior art, or all or part of the technical solution may be embodied in the form of a software product, where the software product is stored in a storage medium and includes several instructions to enable a device (which may be a single chip, a chip, or the like) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions within the technical scope of the present invention are intended to be covered by the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (9)
1. A control method of an air conditioner is characterized by being applied to the air conditioner, and the air conditioner comprises the following steps: n indoor units and M outdoor units, wherein N and M are integers greater than or equal to 1; wherein, N indoor sets include at least one three control indoor sets, three control indoor sets include: the system comprises a first indoor heat exchanger, a first electronic expansion valve, a second indoor heat exchanger and a second electronic expansion valve; the outdoor unit includes: the first four-way valve, the gas-liquid separator, the compressor and the control valve;
the air outlet of the compressor is connected with the first end of the control valve, the second end of the control valve is connected with one end of a third pipeline, and the third end of the control valve is connected with the air suction port of the gas-liquid separator;
the other end of the third pipeline is connected with one end of the first indoor heat exchanger, the other end of the first indoor heat exchanger is connected with one end of the first electronic expansion valve, and the other end of the first electronic expansion valve is connected with one end of the liquid pipe and also connected with one end of the second electronic expansion valve;
the other end of the second electronic expansion valve is connected with one end of the second indoor heat exchanger, and the other end of the second indoor heat exchanger is connected with one end of the air pipe; the other end of the air pipe is connected with the first four-way valve;
the control valve includes: a first electrically controlled valve and a second electrically controlled valve;
one end of the first electric control valve is a first end of the control valve, and the other end of the first electric control valve is connected with one end of the second electric control valve and is a second end of the control valve; the other end of the second electric control valve is a third end of the control valve;
the first electric control valve and the second electric control valve are respectively a first electromagnetic valve and a second electromagnetic valve; or the first electric control valve and the second electric control valve are respectively a third electronic expansion valve and a fourth electronic expansion valve;
the control valve is a second four-way valve;
the exhaust end of the second four-way valve is the first end of the control valve, the evaporation end of the second four-way valve is the second end of the control valve, the suction end of the second four-way valve is the third end of the control valve, and the condensation end of the second four-way valve is suspended;
the control method comprises the following steps:
under the condition of operating the refrigeration mode, when the high-pressure is determined to be greater than a refrigeration first preset value, the low-pressure is determined to be greater than a refrigeration second preset value, and the exhaust temperature of the compressor is determined to be less than a refrigeration first preset temperature value, the third pipeline and the first indoor heat exchanger are controlled to be in a high-pressure state so as to store the refrigerant;
otherwise, controlling the third pipeline and the first indoor heat exchanger to be in a low-pressure state;
when the control valve includes: during first electric control valve and second electric control valve, control third pipeline and first indoor heat exchanger and be high pressure state, include:
controlling a first electronic expansion valve to be closed, controlling a first electronic control valve to be opened, and controlling a second electronic control valve to be closed;
the controlling the third pipeline and the first indoor heat exchanger to be in a low-pressure state includes:
and controlling the first electronic expansion valve to be opened, controlling the first electronic control valve to be closed, and controlling the second electronic control valve to be opened.
2. The control method of an air conditioner according to claim 1, characterized in that after said controlling said first electrically controlled valve to be opened and said second electrically controlled valve to be closed, said method further comprises:
and when the high-pressure is determined to be smaller than a third refrigeration preset value, the low-pressure is determined to be smaller than a fourth refrigeration preset value, and the exhaust temperature of the compressor is determined to be larger than a second refrigeration preset temperature value, keeping the first electronic control valve open, keeping the second electronic control valve closed, and controlling the first electronic expansion valve to open.
3. The control method of an air conditioner according to claim 2, further comprising, after said keeping said first electrically controlled valve open, keeping said second electrically controlled valve closed, and controlling said first electronic expansion valve open:
and when determining that the high pressure is not satisfied with at least one of the fifth preset value of refrigeration, the sixth preset value of refrigeration and the exhaust temperature of the compressor is lower than the third preset temperature value of refrigeration, controlling the first electronic control valve to close, keeping the second electronic control valve closed, and controlling the first electronic expansion valve to close.
4. The control method of an air conditioner according to claim 1, further comprising:
under the condition of operating a heating mode, when the high-pressure is determined to be smaller than a first preset heating value, the low-pressure is determined to be smaller than a second preset heating value, and the exhaust temperature of the compressor is determined to be larger than a first preset heating temperature value, the third pipeline and the first indoor heat exchanger are controlled to be in the low-pressure state, so that refrigerants in the third pipeline and the first indoor heat exchanger are led out;
otherwise, controlling the third pipeline and the first indoor heat exchanger to be in the high-pressure state.
5. The control method of an air conditioner according to claim 4, wherein when the control valve includes: when the first electric control valve and the second electric control valve are used, the third pipeline and the first indoor heat exchanger are controlled to be in the low-pressure state, and the method comprises the following steps:
controlling the first electronic expansion valve to be closed, controlling the first electronic control valve to be closed, and controlling the second electronic control valve to be opened;
the controlling the third pipeline and the first indoor heat exchanger to be in the high-pressure state includes:
and controlling the first electronic expansion valve to be opened, controlling the first electronic control valve to be opened, and controlling the second electronic control valve to be closed.
6. The control method of an air conditioner according to claim 5, further comprising, after controlling the first electrically controlled valve to be closed and the second electrically controlled valve to be opened:
and when the high-pressure is determined to be greater than a third heating preset value, the low-pressure is determined to be greater than a fourth heating preset value, and the exhaust temperature of the compressor is determined to be less than a second heating preset temperature value, the first electronic control valve is kept closed, the second electronic control valve is controlled to be closed, and the first electronic expansion valve is controlled to be opened.
7. The method of claim 6, further comprising, after said keeping said first electronically controlled valve closed, controlling said second electronically controlled valve closed, and controlling said first electronically expansion valve open:
when determining that the high pressure is not satisfied with at least one of the fifth preset heating value, the sixth preset heating value and the exhaust temperature of the compressor is greater than the third preset heating temperature value, keeping the first electronic control valve closed, keeping the second electronic control valve closed, and controlling the first electronic expansion valve to close.
8. An air conditioner, characterized in that the air conditioner comprises: a processor;
when the air conditioner is operated, the processor executes computer-executable instructions to cause the air conditioner to perform the control method of the air conditioner according to any one of claims 1 to 7.
9. A computer storage medium characterized by comprising computer-executable instructions that, when run on an air conditioner, cause the air conditioner to perform the control method of the air conditioner according to any one of claims 1 to 7.
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| CN113834140B (en) * | 2021-08-31 | 2023-03-31 | 青岛海尔空调电子有限公司 | Control method and system of air conditioner |
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| JP3953976B2 (en) * | 2003-04-30 | 2007-08-08 | 三星電子株式会社 | Air conditioner |
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