CN110715484A - Air conditioner, control method and device thereof, and computer-readable storage medium - Google Patents

Air conditioner, control method and device thereof, and computer-readable storage medium Download PDF

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Publication number
CN110715484A
CN110715484A CN201911023688.4A CN201911023688A CN110715484A CN 110715484 A CN110715484 A CN 110715484A CN 201911023688 A CN201911023688 A CN 201911023688A CN 110715484 A CN110715484 A CN 110715484A
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CN
China
Prior art keywords
heat exchanger
heat
preset
outdoor heat
temperature
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Pending
Application number
CN201911023688.4A
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Chinese (zh)
Inventor
刘旭
黎辉玲
杜顺开
谭周衡
曾小朗
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Midea Group Co Ltd
GD Midea Air Conditioning Equipment Co Ltd
Original Assignee
Midea Group Co Ltd
Guangdong Midea Refrigeration Equipment Co Ltd
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Publication date
Application filed by Midea Group Co Ltd, Guangdong Midea Refrigeration Equipment Co Ltd filed Critical Midea Group Co Ltd
Priority to CN201911023688.4A priority Critical patent/CN110715484A/en
Publication of CN110715484A publication Critical patent/CN110715484A/en
Pending legal-status Critical Current

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    • 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
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02—Defrosting cycles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/41—Defrosting; Preventing freezing
    • F24F11/42—Defrosting; Preventing freezing of outdoor units
    • 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
    • F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
    • 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
    • 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
    • F25B41/30—Expansion means; Dispositions thereof
    • 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
    • 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
    • F25B2347/00—Details for preventing or removing deposits or corrosion
    • F25B2347/02—Details of defrosting cycles
    • 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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/24—Storage receiver heat

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Thermal Sciences (AREA)
  • Signal Processing (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Human Computer Interaction (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention provides an air conditioner and a control method, a control device and a computer readable storage medium thereof, wherein the control method comprises the following steps: judging whether heat storage is needed or not according to working condition parameters of the air conditioner; and judging that heat accumulation is needed, and controlling the switching device to be started so as to conduct the heat accumulation pipe. The control method provided by the invention judges whether the heat accumulator needs heat accumulation according to the working condition parameters of the air conditioner, and when the heat accumulation is needed, the switch device is started, and the heat accumulation pipe is conducted, so that the heat accumulation of the heat accumulator is realized. Thereby realizing controllable heat storage and reducing the energy loss of the air conditioning system. Because the indoor heat exchanger is parallelly connected with the heat accumulation pipe, when heat accumulation, the indoor heat exchanger is flowed through to some high temperature refrigerant, and the heat accumulation pipe is flowed through to some, because the refrigerant temperature of flowing through the heat accumulation pipe is higher, consequently, the heat accumulation of heat accumulator is fast, avoids having the not enough problem of heat accumulator heat accumulation, has reduced the time of defrosting, and makes the defrosting clean.

Description

Air conditioner, control method and device thereof, and computer-readable storage medium
Technical Field
The present invention relates to the field of refrigeration equipment, and more particularly, to an air conditioner, a control method thereof, a control device thereof, and a computer-readable storage medium.
Background
When the traditional defrosting mode utilizes heat storage defrosting, a heat accumulator arranged on a compressor shell is used as a main heat source of a defrosting working condition, waste heat of the compressor is absorbed during heating, and during defrosting, a refrigerant flows out of an indoor heat exchanger and then enters an outdoor heat exchanger through a bypass pipeline connected with a throttling component in parallel to defrost.
In the defrosting method, the compressor is used for heat storage and defrosting of the low-temperature heat source, heat storage is carried out by utilizing the heat generated by the compressor, the heat storage is uncontrollable, the phase-change temperature of the phase-change material is low, the heat release speed is low during defrosting, and when the heat storage of the heat storage is insufficient, the problems of long defrosting time, unclean defrosting and the like are caused.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art.
To this end, a first aspect of the present invention is directed to a control method of an air conditioner.
A second aspect of the present invention is directed to a control device.
A third aspect of the present invention is directed to an air conditioner.
A fourth aspect of the present invention is directed to a computer-readable storage medium.
In order to achieve the above object, an aspect of the present invention provides a method for controlling an air conditioner, where the air conditioner includes an indoor heat exchanger and a heat accumulator, the heat accumulator includes a heat accumulation pipe, the heat accumulation pipe is connected in parallel with the indoor heat exchanger, and a switch device for controlling on/off of the heat accumulation pipe is connected to the heat accumulation pipe, and the method includes: judging whether heat storage is needed or not according to working condition parameters of the air conditioner; and judging that heat accumulation is needed, and controlling the switching device to be started so as to conduct the heat accumulation pipe.
According to the control method provided by the technical scheme of the invention, whether the heat accumulator needs heat accumulation is judged according to the working condition parameters of the air conditioner, and when the heat accumulator needs heat accumulation, the switching device is started, the heat accumulation pipe is conducted, and the heat accumulation of the heat accumulator is realized. Thereby realizing controllable heat storage and reducing the energy loss of the air conditioning system.
Because the indoor heat exchanger is parallelly connected with the heat accumulation pipe, when heat accumulation, the indoor heat exchanger is flowed through to some high temperature refrigerant, and the heat accumulation pipe is flowed through to some, because the refrigerant temperature of flowing through the heat accumulation pipe is higher, consequently, the heat accumulation of heat accumulator is fast, avoids having the not enough problem of heat accumulator heat accumulation, has reduced the time of defrosting, and makes the defrosting clean.
In addition, the control method provided by the above technical solution of the present invention has the following additional technical features:
in one embodiment, the operating condition parameter includes a coil temperature of the outdoor heat exchanger, and the determining whether heat storage is required according to the operating condition parameter of the air conditioner specifically includes: starting up the machine for heating and controlling the switch device to be closed; detecting a first lowest value of the coil temperature of the outdoor heat exchanger between a first preset time and a second preset time when the outdoor heat exchanger is started to heat; detecting the coil temperature of the outdoor heat exchanger; if the difference value between the first lowest value and the coil temperature of the outdoor heat exchanger is greater than or equal to a first preset difference value, judging that heat storage is needed; and if the difference value between the first lowest value and the coil temperature of the outdoor heat exchanger is smaller than the first preset difference value, judging that heat storage is not needed, and controlling the switching device to be closed so as to disconnect the heat storage pipe.
Starting up the machine to heat, firstly, operating a heating mode. After the outdoor heat exchanger is started, coil temperature of the outdoor heat exchange tube is detected between a first preset time and a second preset time, the lowest value (first lowest value) of the coil temperature of the outdoor heat exchanger between the first preset time and the second preset time is obtained, after the second preset time, the coil temperature of the outdoor heat exchanger is detected, the detected coil temperature of the outdoor heat exchanger is compared with the first lowest value, if the difference value between the first lowest value and the coil temperature of the outdoor heat exchanger is larger than or equal to the first preset difference value, the fact that the outdoor heat exchanger is frosted is indicated, the heat accumulator needs to accumulate heat, the switch device is controlled to be turned on, and a refrigerant flows through the heat accumulation tube to accumulate heat. If the difference value between the first lowest value and the coil temperature of the outdoor heat exchanger is smaller than the first preset difference value, the fact that the outdoor heat exchanger is not frosted or the frosting degree is small is indicated, the heat accumulator does not need to accumulate heat, the switch device is controlled to be closed, and the refrigerant does not flow through the heat accumulation pipe.
Therefore, the frosting condition of the outdoor heat exchanger is judged according to the temperature of the coil pipe of the outdoor heat exchanger, whether the heat accumulator needs heat accumulation or not is judged, heat accumulation is not carried out under the working condition that heat accumulation is not needed, and the energy loss of the system is reduced.
Further, a first lowest value acquired between the first preset time and the second preset time is a lowest value of the temperature at the outlet of the coil of the outdoor heat exchanger in the refrigeration mode, and the coil temperature of the outdoor heat exchanger detected after the second preset time is also the temperature at the outlet of the coil of the outdoor heat exchanger in the refrigeration mode. It is understood that the first lowest value may also be the lowest value of the temperature at the other positions on the coil of the outdoor heat exchanger except for the outlet, and the coil temperature of the outdoor heat exchanger detected after the second preset time is the temperature of the coil at the same position as the first lowest value.
It can be understood that the frosting condition of the outdoor heat exchanger can be judged according to the temperature of the coil pipe of the outdoor heat exchanger, and the frosting condition of the outdoor heat exchanger can also be judged according to the temperature of the outdoor environment.
In one embodiment, the first preset time is within a range of 5min to 11min, the second preset time is within a range of 11min to 15min, and the first preset difference is within a range of 1 ℃ to 3 ℃.
The range of the first preset time is 5-11 min, the first preset time is prevented from being smaller than 5min, the air conditioning system is unstable in operation, the acquired first minimum value is inaccurate, and the condition that the frosting condition of the outdoor heat exchanger cannot be found timely due to the fact that the first minimum value is acquired too late when the first preset time is larger than 11min is also avoided. The first preset time may be 5min, 7min, 9min or 11 min.
The range of the second preset time is 11-15 min, the second preset time is prevented from being smaller than 11min, the air conditioning system is unstable in operation, the acquired first minimum value is inaccurate, and the condition that the frosting condition of the outdoor heat exchanger cannot be found timely due to the fact that the time for acquiring the first minimum value is too late when the second preset time is larger than 15min is also avoided. The second preset time may be 11min, 12min, 13min, 14min or 15 min.
The range of the first preset difference is 1-3 ℃, and the first preset difference is prevented from being smaller than 1 ℃, so that the first preset difference is smaller, and the frosting condition of the outdoor heat exchanger can be judged wrongly; and the situation that the first preset difference is larger than 3 ℃ so that heat accumulation is started only after the outdoor heat exchanger frosts seriously due to the larger first preset difference is avoided.
In one embodiment, after the controlling the switching device to be turned off to disconnect the heat storage pipe, the method further includes: detecting a second lowest value of the coil temperature of the outdoor heat exchanger between a third preset time and a fourth preset time when the switching device is turned off; detecting the coil temperature of the outdoor heat exchanger; if the difference value between the second lowest value and the coil temperature of the outdoor heat exchanger is greater than or equal to a second preset difference value, judging that heat storage is needed; and if the difference value between the second lowest value and the coil temperature of the outdoor heat exchanger is smaller than the second preset difference value, judging that heat storage is not needed, and returning to the detection of the second lowest value of the coil temperature of the outdoor heat exchanger between the third preset time and the fourth preset time when the switching device is closed.
And controlling the switching device to be closed when the situation that heat storage is not needed is judged according to the relation between the difference value between the first lowest value and the temperature of the coil pipe of the outdoor heat exchanger and the first preset difference value. After the switching device is turned off, coil temperature of the outdoor heat exchange tube is detected between a third preset time and a fourth preset time, the lowest value (second lowest value) of the coil temperature of the outdoor heat exchanger between the third preset time and the fourth preset time is obtained, after the fourth preset time, the coil temperature of the outdoor heat exchanger is detected, the detected coil temperature of the outdoor heat exchanger is compared with the second lowest value, if the difference value between the second lowest value and the coil temperature of the outdoor heat exchanger is larger than or equal to the second preset difference value, the fact that the outdoor heat exchanger is frosted is indicated, the heat accumulator needs to accumulate heat, the switching device is controlled to be turned on, and a refrigerant flows through the heat accumulation tube to accumulate heat. If the difference value between the second lowest value and the coil temperature of the outdoor heat exchanger is smaller than the second preset difference value, the fact that the outdoor heat exchanger is not frosted or the frosting degree is small is indicated, the heat accumulator does not need to accumulate heat, the switch device is controlled to be closed, and the refrigerant does not flow through the heat accumulation pipe.
Therefore, the frosting condition of the outdoor heat exchanger is judged according to the temperature of the coil pipe of the outdoor heat exchanger, whether the heat accumulator needs heat accumulation or not is judged, heat accumulation is not carried out under the working condition that heat accumulation is not needed, and the energy loss of the system is reduced.
Further, a second lowest value obtained between the third preset time and the fourth preset time is a lowest value of the temperature at the outlet of the coil of the outdoor heat exchanger in the refrigeration mode, and the coil temperature of the outdoor heat exchanger detected after the fourth preset time is also the temperature at the outlet of the coil of the outdoor heat exchanger in the refrigeration mode. It is to be understood that the second lowest value may also be the lowest value of the temperature at the other positions on the coil of the outdoor heat exchanger except for the outlet, and the coil temperature of the outdoor heat exchanger detected after the fourth preset time is the temperature of the coil at the same position as the second lowest value.
In one embodiment, the third preset time is in a range of 5min to 11min, the fourth preset time is in a range of 11min to 15min, and the second preset difference is in a range of 1 ℃ to 3 ℃.
The third preset time is within the range of 5-11 min, if the third preset time is less than 5min, the time for judging whether the outdoor heat exchanger frosts is short according to the first lowest value, the outdoor heat exchanger does not frost or the frosting degree is low, whether the heat accumulator needs to store heat is not needed to be judged, and the condition that the frosting condition of the outdoor heat exchanger cannot be found in time due to the fact that the time for obtaining the second lowest value is too late when the third preset time is greater than 11min is also avoided. The third preset time may be 5min, 7min, 9min or 11 min.
The range of the fourth preset time is 11-15 min, the fourth preset time is prevented from being smaller than 11min, the time for judging whether the outdoor heat exchanger frosts according to the first lowest value is short, the outdoor heat exchanger does not frost or the frosting degree is low, whether the heat accumulator needs to store heat is not required to be judged, and the condition that the frosting condition of the outdoor heat exchanger cannot be found in time due to the fact that the time for obtaining the second lowest value is too late when the fourth preset time is larger than 15min is also avoided. The fourth preset time may be 11min, 12min, 13min, 14min or 15 min.
The range of the second preset difference value is 1-3 ℃, and the second preset difference value is prevented from being smaller than 1 ℃, so that the second preset difference value is smaller, and the frosting condition of the outdoor heat exchanger can be judged wrongly; and the situation that the second preset difference value is larger than 3 ℃ so that heat accumulation is started only after the outdoor heat exchanger frosts seriously due to the larger second preset difference value is avoided.
In one embodiment, the heat accumulator includes a heat exchange tube, the air conditioner includes a reversing element, the reversing element includes a first connecting port to a third connecting port, the second connecting port is connected with an air inlet of the compressor through a connecting pipeline, one end of the heat exchange tube is connected with the third connecting port, and the heat exchange tube is connected with the connecting pipeline in parallel, and the control method includes: and under the heating mode, the defrosting is judged to be needed, the switching device is controlled to be closed, and the first connecting port of the reversing piece is controlled to be communicated with the third connecting port, so that the refrigerant flows through the heat exchange tube until the preset condition is met.
When the defrosting is needed, the switch device is controlled to be closed, the heat storage pipe is disconnected, and the heat storage device stops storing heat.
The first connecting port is communicated with the third connecting port, the refrigerant is controlled to flow through the heat exchange tube, the refrigerant is evaporated in the heat exchange tube to absorb heat, and is condensed in the outdoor heat exchanger to release heat, so that defrosting of the outdoor heat exchanger is realized.
In one embodiment, the preset condition includes that the coil temperature of the outdoor heat exchanger is greater than a first preset temperature, or the coil temperature of the outdoor heat exchanger is greater than a second preset temperature within a preset time period, wherein the first preset temperature is greater than the second preset temperature.
The temperature of the coil of the outdoor heat exchanger is higher than a first preset temperature, which indicates that defrosting of the outdoor heat exchanger is completed, and the defrosting mode can be exited. Or the temperature of the coil of the outdoor heat exchanger is greater than a second smaller preset temperature within a preset time, which also indicates that defrosting of the outdoor heat exchanger is completed, and the defrosting mode can be exited.
Further, the coil temperature of the outdoor heat exchanger in the preset condition is the lowest value of the temperature at the inlet of the coil of the outdoor heat exchanger in the refrigeration mode. It is understood that the coil temperature of the outdoor heat exchanger in the preset condition may also be a temperature at a position other than the inlet on the coil of the outdoor heat exchanger.
In one embodiment, the first preset temperature ranges from 6 ℃ to 12 ℃, the second preset temperature ranges from 3 ℃ to 8 ℃, and the preset time ranges from 20s to 60 s.
The first preset temperature is in the range of 6-12 ℃, the first preset temperature is prevented from being smaller than 6 ℃, the defrosting effect of the outdoor heat exchanger is poor, and the first preset temperature is also prevented from being larger than 12 ℃, so that the defrosting mode is operated after the defrosting of the outdoor heat exchanger is finished, and the energy waste of the system is caused. The first preset temperature may be, but is not limited to, 6 ℃, 8 ℃, 10 ℃ or 12 ℃.
The second preset temperature is in a range of 3-8 ℃, the second preset temperature is prevented from being lower than 3 ℃, the defrosting effect of the outdoor heat exchanger is poor, and the second preset temperature is also prevented from being higher than 8 ℃, so that the outdoor heat exchanger still operates in a defrosting mode after defrosting is finished, and the energy waste of the system is caused. The second preset temperature may be, but is not limited to, 3 ℃, 6 ℃, or 8 ℃.
The preset time is within the range of 20 s-60 s, the condition that the defrosting effect of the outdoor heat exchanger is poor due to the fact that the preset time is less than 20s is avoided, and the condition that the defrosting mode is operated after the defrosting of the outdoor heat exchanger is finished due to the fact that the preset time is more than 60s, and the energy waste of the system is caused. The preset time period may be, but is not limited to, 20s, 40s, or 60 s.
An aspect of a second aspect of the present invention provides a control device, including a processor and a memory, where the processor is configured to implement the steps of the control method according to any one of the aspects of the first aspect when executing a computer program stored in the memory.
An aspect of the third aspect of the present invention provides an air conditioner including the control device according to the second aspect.
An aspect of the fourth aspect of the present invention provides a computer-readable storage medium on which a computer program (instructions) is stored, the computer program (instructions), when executed by a processor, implementing the steps of the control method according to any one of the aspects of the second aspect.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention, in which solid arrows indicate a flow direction of a refrigerant in a cooling mode, and hollow arrows indicate a flow direction of a check valve;
fig. 2 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention, in which solid arrows indicate a flow direction of a refrigerant in a heating mode, and hollow arrows indicate a flow direction of a check valve;
fig. 3 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention, in which solid arrows indicate a flow direction of a refrigerant in a heat storage state, and hollow arrows indicate a flow direction of a check valve;
fig. 4 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention, in which solid arrows indicate a flow direction of a refrigerant in a defrosting mode, and hollow arrows indicate a flow direction of a check valve;
FIG. 5 is a flow chart illustrating a control method according to an embodiment of the present invention;
FIG. 6 is a flow chart illustrating a control method according to an embodiment of the present invention;
FIG. 7 is a flow chart illustrating a control method according to an embodiment of the present invention;
fig. 8 is a schematic block diagram of a control device according to an embodiment of the present invention.
Wherein, the correspondence between the reference numbers and the component names in fig. 1 to 8 is:
the heat exchanger comprises a compressor, an 11 exhaust port, a 12 air inlet, a 2 reversing structure, a 21 first port, a 22 second port, a 23 third port, a 24 fourth port, a 3 outdoor heat exchanger, a 4 first throttling part, a 41 heating throttling part, a 42 refrigerating throttling part, a 5 heat accumulator, a 51 heat accumulating pipe, a 52 heat exchange pipe, a 53 second throttling part, a 54 heat accumulating cavity, a 6 reversing part, an e first connecting port, an f second connecting port, a g third connecting port, a 7 indoor heat exchanger, an 8 switching device, an 81 one-way valve, an 82 electromagnetic valve, a 10 connecting pipeline, a 20 communicating pipeline, a 30 bypass pipeline, a 31 switching structure, a 200 control device, a 204 memory and a 206 processor.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced otherwise than as specifically described herein, and thus the scope of the present invention is not limited by the specific embodiments disclosed below.
An air conditioner, a control method, a control apparatus, and a computer-readable storage medium according to some embodiments of the present invention are described below with reference to fig. 1 to 8.
The air conditioner comprises a compressor 1, a reversing structure 2, an outdoor heat exchanger 3, an indoor heat exchanger 7, a heat accumulator 5 and a reversing piece 6.
The compressor 1 includes an exhaust port 11 and an intake port 12.
The reversing structure 2 includes first to fourth ports 21 to 24, one of the second and fourth ports 22 and 24 is communicated with the first port 21, the other of the second and fourth ports 22 and 24 is communicated with the third port 23, the first port 21 is connected to the exhaust port 11, the second port 22 is connected to the first end of the outdoor heat exchanger 3, and the fourth port 24 is connected to the first end of the indoor heat exchanger 7. The reversing structure 2 may be a four-way valve.
The heat accumulator 5 comprises a heat accumulation pipe 51 and a heat exchange pipe 52, the heat accumulation pipe 51 is connected with the indoor heat exchanger 7 in parallel, and a switch device 8 for controlling the on-off of the heat accumulation pipe 51 is connected to the heat accumulation pipe 51.
The direction changing member 6 includes a first connection port e selectively communicated with one of a second connection port f and a third connection port g, the first connection port e is connected with the third connection port 23, the second connection port f is connected with the gas inlet 12 through the connection pipe 10, the third connection port g is connected with one end of the heat exchange pipe 52, and the heat exchange pipe 52 is connected in parallel with the connection pipe 10.
The reversing piece can be a three-way valve, or the reversing piece comprises a first valve and a second valve, the first valve is connected between the third port 23 and the air inlet 12 in series, the second valve is arranged on the heat exchange pipe 52, the heat exchange pipe 52 is connected with the first valve in parallel, one interface of the first valve forms a first connecting port e, one interface of the second valve forms a third connecting port g, and the other interface of the first valve and the other interface of the second valve form a first connecting port e together.
According to the air conditioner provided by the technical scheme of the invention, in the heating mode, when the defrosting is judged not to be needed, the heat accumulator 5 is subjected to heat accumulation. During heat storage, the switching device 8 is opened, and the refrigerant flows through the heat storage pipe 51 to store heat.
And in the heating mode, when the defrosting is needed, entering a defrosting mode. In the defrosting mode, the first connection port e is communicated with the third connection port g, the refrigerant discharged from the exhaust port 11 of the compressor 1 flows into the outdoor heat exchanger 3 through the indoor heat exchanger 7, the refrigerant releases heat in the outdoor heat exchanger 3 to defrost, the refrigerant flows into the heat exchange tube 52 through the first connection port e and the third connection port g after defrosting, and the refrigerant evaporates in the heat accumulator 5 and flows back to the air inlet 12 of the compressor 1.
In the defrosting mode, the reversing structure 2 does not reverse, can continuously supply heat to the indoor, does not influence the heating of the air conditioner, and does not influence the comfort of users; the refrigerant flows through the heat storage pipe 51 to store heat, so that the problem of insufficient heat storage of the heat accumulator 5 is avoided, the defrosting time is shortened, and the defrosting is clean; the on-off of the heat storage pipe 51 is controlled by controlling the on-off of the switch device 8, so that controllable heat storage is realized, the switch device 8 can be controlled to be closed under the working condition that heat storage is not needed, heat is not stored, and energy loss is reduced.
In one embodiment, the air conditioner further includes a first throttling part 4 and a bypass line 30.
A communication pipeline 20 is connected between a confluence point of the second end of the indoor heat exchanger 7 and the other end of the heat storage pipe 51 and the second end of the outdoor heat exchanger 3, and the first throttling part 4 is connected in series on the communication pipeline 20.
The bypass pipeline 30 is connected in parallel with the first throttling component 4, and a switch structure 31 for controlling the on-off of the bypass pipeline 30 is arranged on the bypass pipeline 30.
The switch structure 31 is turned on to turn on the bypass line 30, and the switch structure 31 is turned off to turn off the bypass line 30. The bypass line 30 and the switch structure 31 are arranged to enable the refrigerant to selectively flow through the first throttling component 4 and the bypass line 30, so as to control the heat exchange condition (whether condensation or evaporation) of the refrigerant in the outdoor heat exchanger 3.
Specifically, as shown in fig. 1, in the cooling mode, the switching mechanism 31 is closed, the bypass line 30 is disconnected, and the refrigerant flows through the first throttling part 4 and is condensed in the outdoor heat exchanger 3. As shown in fig. 2, in the heating mode, the switching mechanism 31 is closed, the bypass line 30 is disconnected, and the refrigerant flows through the first throttling part 4 and evaporates in the outdoor heat exchanger 3. As shown in fig. 3, when the accumulator 5 accumulates heat, the switching mechanism 31 is closed, the bypass line 30 is disconnected, and the refrigerant flows through the first throttling member 4 and evaporates in the outdoor heat exchanger 3. As shown in fig. 4, in the defrosting mode, the switch structure 31 is turned on, the bypass line 30 is conducted, and the refrigerant flows through the bypass line 30 and is condensed in the outdoor heat exchanger 3 to achieve defrosting.
The switch structure 31 may be a solenoid valve, and specifically, the solenoid valve may be a one-way solenoid valve or a two-way solenoid valve.
In a specific embodiment, the first throttling component 4 includes a cooling throttling component 42 and a heating throttling component 41 which are connected in series, the heating throttling component 41 is connected in parallel with the bypass pipeline 30, the cooling throttling component 42 is configured to perform throttling in a cooling mode, the heating mode is in one-way conduction along a direction from the second end of the indoor heat exchanger 7 to the second end of the outdoor heat exchanger 3, the heating throttling component 41 is configured to perform throttling in a heating mode, and the cooling mode is in one-way conduction along a direction from the second end of the outdoor heat exchanger 3 to the second end of the indoor heat exchanger 7.
In the defrosting mode, the control switch structure 31 is opened, the bypass pipeline 30 is conducted, the refrigerant flows out from the second end of the indoor heat exchanger 7, then flows through the refrigeration throttling component 42 and the bypass pipeline 30, and enters the outdoor heat exchanger 3, and because the refrigeration throttling component 42 does not have a throttling function on the refrigerant, the refrigerant flowing out from the second end of the indoor heat exchanger 7 does not throttle when flowing into the outdoor heat exchanger 3, so that the refrigerant is condensed in the outdoor heat exchanger 3 to release heat, and defrosting is performed on the outdoor heat exchanger 3.
The cooling throttling part 42 throttles in the cooling mode, i.e., in the flow direction from the second end of the outdoor heat exchanger 3 to the second end of the indoor heat exchanger 7, and is fully conducted in the direction from the second end of the indoor heat exchanger 7 to the second end of the outdoor heat exchanger 33 in the heating mode, and has no throttling effect. The heating throttle member 41 throttles in the heating mode, i.e., throttles in the flow direction from the second end of the indoor heat exchanger 7 to the second end of the outdoor heat exchanger 3, and is fully conducted in the direction from the second end of the outdoor heat exchanger 3 to the second end of the indoor heat exchanger 7 in the cooling mode, and does not have a throttling effect. The cooling throttle part 42 and the heating throttle part 41 may be throttle valves.
It is understood that the bypass line 30 may be connected in parallel with the entire first throttling element 4, i.e., the cooling throttling element 42 and the heating throttling element 41 are connected in parallel with the bypass line 30 as a whole.
In another specific embodiment, the first throttling element 4 comprises a throttling element body with a throttling function and a third switching device which is connected with the throttling element body in series and is used for controlling the on-off of a pipeline in which the throttling element body is arranged.
In the case where the first throttling member 4 includes the throttling member body and the third switching device, if the refrigerant flowing out from the second end of the indoor heat exchanger 7 flows into the outdoor heat exchanger 3, the refrigerant does not flow through the first throttling part for throttling but flows through the bypass line 30, so that the refrigerant can be condensed in the outdoor heat exchanger 3 to release heat, thereby defrosting the outdoor heat exchanger 3. If the refrigerant flowing out of the second end of the indoor heat exchanger 7 flows into the outdoor heat exchanger 3 through the first throttling part 4, the refrigerant evaporates and absorbs heat in the outdoor heat exchanger 3. The third switch device can be an electromagnetic valve which can be a one-way electromagnetic valve or a two-way electromagnetic valve, and the throttle part body can be an electronic expansion valve, a two-way throttle valve, a capillary tube or a thermal expansion valve.
In a specific embodiment, the switching device 8 includes a check valve 81 and a solenoid valve 82, and the check valve 81 and the solenoid valve 82 are connected in series with the heat storage pipe 51, and the check valve 81 is in one-way communication in a direction from the fourth port 24 to the heat storage pipe 51.
The check valve 81 is in one-way conduction along the direction from the fourth port 24 to the heat storage pipe 51, so that the refrigerant flowing out of the second end of the outdoor heat exchanger 3 in the refrigeration mode cannot pass through the check valve 81, the refrigerant cannot flow through the heat storage pipe 51, the temperature of the heat accumulator 5 is prevented from being reduced due to the fact that the refrigerant flows into the heat storage pipe 51, the electromagnetic valve 82 can control the on-off of the heat storage pipe 51, the electromagnetic valve 82 is opened, the heat storage pipe 51 is in conduction, the refrigerant can flow through the heat storage pipe 51 in the heating mode, and the heat accumulator 5 stores heat. The solenoid valve 82 may be a one-way solenoid shut-off valve or a two-way solenoid shut-off valve.
Further, the electromagnetic valve 82 is a one-way electromagnetic cut-off valve that opens to communicate in the direction from the fourth port 24 to the heat storage pipe 51. The switching device 8 includes the check valve 81, and a control program of the air conditioner can be simplified.
In another specific embodiment, the switching device 8 includes a two-way electromagnetic shutoff valve, which is connected in series with the heat storage pipe 51.
The bidirectional electromagnetic cut-off valve is connected in series with the heat storage pipe 51 and used for controlling the on-off of the heat storage pipe 51, when the bidirectional electromagnetic cut-off valve is opened, the heat storage pipe 51 is switched on, the refrigerant can flow through the heat storage pipe 51, when the bidirectional electromagnetic cut-off valve is closed, the heat storage pipe 51 is switched off, the refrigerant cannot flow through the heat storage pipe 51, and therefore the state of the heat accumulator 5 can be selectively controlled.
In one embodiment, a second throttling member 53 is connected in series between the third connecting port g and one end of the heat exchange pipe 52.
And in the defrosting mode, the first connecting port e is controlled to be communicated with the third connecting port g, and the refrigerant flowing out of the outdoor heat exchanger 3 enters the heat exchange tube 52 through the first connecting port e, the third connecting port g and the second throttling component 53 after passing through the reversing structure 2. The second throttling part 53 throttles the refrigerant so that the refrigerant can be evaporated in the heat exchange pipe 52 and then flows back to the air inlet 12 of the compressor 1.
The second throttling part 53 may be a capillary tube, an electronic expansion valve, a thermal expansion valve, or a throttle valve.
In one embodiment, the regenerator 5 includes a thermal storage chamber 54, and at least part of the thermal storage tubes 51 and the heat exchange tubes 52 are located in the thermal storage chamber 54, and the thermal storage chamber 54 is filled with a thermal storage material, which includes a phase change material.
At least parts of the heat storage pipe 51 and the heat exchange pipe 52 are arranged in a heat storage cavity 54 of the heat accumulator 5, so that the first heat exchanger and the second heat exchanger can be protected to a certain extent, and the heat accumulator 5 has a stable state in the working process of the air conditioner. The heat storage cavity is filled with a heat storage material, and heat storage and heat release of the heat accumulator 5 are realized by utilizing the phase change of the heat storage material.
The heat storage material is made of a phase-change material, and the physical property of the phase-change material is utilized to change the physical form of the phase-change material so as to absorb or release heat. The air conditioner of the invention stores heat in the heat accumulator 5 by arranging a certain amount of phase-change materials in the heat accumulator 5, and the phase-change materials change in shape and release heat to accelerate defrosting in the defrosting process.
In one embodiment, the phase change temperature of the heat storage material is less than or equal to 70 ℃, and the phase change temperature of the heat storage material is lower, so that when the temperature of the refrigerant is lower, the refrigerant passes through the heat storage pipe 51, and the heat accumulator 5 can still store heat.
The heat storage material comprises at least one of water, paraffin, ethylene glycol aqueous solution and disodium hydrogen phosphate dodecahydrate, and a better phase change material can be selected according to the actual application situation in specific application.
In one embodiment, a temperature sensing device is provided in the thermal accumulator 5.
The temperature detection means is for detecting the temperature of the heat accumulator 5, and further, the temperature detection means is for detecting the temperature of the heat storage material. Whether the heat accumulator 5 needs heat accumulation is judged by detecting the temperature of the heat accumulator 5, so that the controllable heat accumulation of the heat accumulator 5 is realized.
The invention provides an air conditioner, a heat storage defrosting air conditioning system, which comprises a compressor 1, a reversing structure 2, an outdoor heat exchanger 3, a heating throttle valve (heating throttle part 41), a refrigerating throttle valve (refrigerating throttle part 42), an indoor heat exchanger 7, a switch structure 31 connected with the heating throttle valve in parallel and a heat accumulator 5. The parts are connected by pipelines. The heat storage pipe 51 is connected in parallel with the indoor heat exchanger 7, and the heat exchange pipe 52 is connected in parallel with the connecting pipe 10 through the reversing piece 6. The flow of the refrigerant in the different working modes of the air conditioner will be described below by taking the reversing structure 2 as a four-way valve, the reversing member 6 as a three-way valve, the cooling throttle member 42 as a cooling throttle valve, the heating throttle member 41 as a heating throttle valve, and the switching device 8 including the solenoid valve 82 and the check valve 81 as examples.
The refrigerant flow in the cooling mode is as shown in fig. 1, the compressor 1 compresses the refrigerant into high-temperature high-pressure gas, the refrigerant is connected to the outdoor heat exchanger 3 through the ab port (a is the first port 21, b is the second port 22) of the four-way valve to be condensed into medium-temperature high-pressure liquid refrigerant, the refrigerant is throttled by the cooling throttle valve to be evaporated and absorbed by the indoor heat exchanger 7, and then the refrigerant is connected through the cd port (c is the fourth port 24, d is the third port 23) of the four-way valve and returns to the compressor 1 through the ef connecting port (e is the first connecting port e, f is the second connecting port f) of the three-way valve, wherein the ef connecting port is communicated when the three-way valve is set to 0 step, the eg connecting port (e is the first connecting port e, g is the third connecting port g) when the 608 steps are performed, wherein the compressor 1 is opened, the opening degree of the reversing piece 6 is 0 step.
As shown in fig. 2, the refrigerant flow in the heating mode is that the compressor 1 compresses the refrigerant into high-temperature and high-pressure gas, the gas is condensed into medium-temperature and high-pressure liquid in the indoor heat exchanger 7 through an ac port (a is a first port 21, c is a fourth port 24) of the four-way valve, the liquid is heated and absorbed by the outdoor condenser through the heating throttle valve, and finally the liquid returns to the compressor 1 through a bd port (b is a second port 22, d is a third port 23) of the four-way valve and an ef connection port (e is a first connection port e, f is a second connection port f) of the three-way valve, wherein the compressor 1 is turned on, the reversing structure 2 is powered on, the outdoor fan is turned on, the switching structure 31 is turned off.
As shown in fig. 3, the refrigerant flow of the heat storage process in the heating mode is that the compressor 1 compresses the refrigerant into a high-temperature and high-pressure gas, and the gas passes through the ac port (a is the first port 21, and c is the fourth port 24) of the four-way valve. A part of refrigerant enters the indoor heat exchanger 7 to be condensed into medium-temperature high-pressure liquid, a part of refrigerant enters the heat accumulator 5 through the one-way valve 81 to heat a heat storage material, the refrigerant is converged with the refrigerant passing through the indoor heat exchanger 7 through the electromagnetic valve 82, the refrigerant passes through the heating throttle valve and then enters the outdoor heat exchanger 3 to absorb heat, and finally the refrigerant returns to the compressor 1 through a bd port (b is a second port 22, d is a third port 23) of the four-way valve and a ef connector (e is a first connector e, and f is a second connector f), wherein the compressor 1 is opened, the reversing structure 2 is powered on, the outdoor fan is opened, the switch structure 31 is closed, the electromagnetic valve 82 (the electromagnetic valve 82) is opened, and the opening.
The flow of the refrigerant during defrosting is shown in fig. 4, the compressor 1 converts the refrigerant into high-temperature and high-pressure gas, the high-temperature and high-pressure gas passes through the ac port (a is the first port 21, c is the fourth port 24) of the four-way valve to be condensed into medium-temperature and high-pressure liquid by the indoor heat exchanger 7, the medium-temperature and high-pressure liquid passes through the switch structure 31 and then enters the outdoor heat exchanger 3 to release heat, the outdoor heat exchanger 3 is defrosted, throttled by a second throttling part 53 to enter the heat accumulator 5 for evaporation through a four-way valve bd port (b is a second port 22, d is a third port 23) and a three-way valve eg connection port (e is a first connection port e, g is a third connection port g), and finally returned to the compressor 1, wherein, the indoor electric heater is turned on, the compressor 1 is turned on, the reversing structure 2 is powered on, the outdoor fan is turned off, the switch structure 31 is turned on, the electromagnetic valve 82 is turned off, the opening degree of the reversing piece 6 is in 608 steps, wherein the defrosting mode is shown as lasting for 4min to the maximum. The indoor electric heater is started to improve the indoor temperature, and the reduction of the indoor temperature caused by defrosting is avoided.
As shown in fig. 5, according to some embodiments of the present invention, there is provided a control method of an air conditioner, where the air conditioner includes an indoor heat exchanger 7 and a heat accumulator 5, the heat accumulator 5 includes a heat accumulation pipe 51, the heat accumulation pipe 51 is connected in parallel with the indoor heat exchanger 7, and a switch device 8 for controlling on/off of the heat accumulation pipe 51 is connected to the heat accumulation pipe 51.
The first embodiment is as follows:
as shown in fig. 5, the control method includes:
step S502, judging whether heat storage is needed or not according to working condition parameters of the air conditioner;
in step S504, it is determined that heat storage is necessary, and the switching device 8 is controlled to be turned on to turn on the heat storage pipe 51.
According to the control method provided by the technical scheme of the invention, whether the heat accumulator 5 needs heat accumulation is judged according to the working condition parameters of the air conditioner, and when the heat accumulation is needed, the switch device 8 is started, and the heat accumulation pipe 51 is conducted, so that the heat accumulation of the heat accumulator 5 is realized. Thereby realizing controllable heat storage and reducing the energy loss of the air conditioning system.
Because the indoor heat exchanger 7 is connected with the heat storage pipe 51 in parallel, when heat is stored, a part of high-temperature refrigerant flows through the indoor heat exchanger 7, and a part of high-temperature refrigerant flows through the heat storage pipe 51, and the temperature of the refrigerant flowing through the heat storage pipe 51 is high, so that the heat storage speed of the heat accumulator 5 is high, the problem that the heat storage of the heat accumulator 5 is insufficient is solved, the defrosting time is shortened, and defrosting is clean.
Example two:
on the basis of the first embodiment, the operating condition parameter includes the coil temperature of the outdoor heat exchanger 3, as shown in fig. 6, the control method includes:
step S602, detecting a startup operation mode;
step S604, if the power is on for heating, the switch device 8 is controlled to be closed;
step S606, detecting a first lowest value of the coil temperature of the outdoor heat exchanger 3 between a first preset time and a second preset time of starting up heating;
step S608, detecting the coil temperature of the outdoor heat exchanger 3 after the second preset time;
step S610, determining whether a difference between the first lowest value and the coil temperature of the outdoor heat exchanger 3 is greater than or equal to a first preset difference;
if yes, judging that heat storage is needed, executing step S612, controlling the switch device 8 to be turned on to conduct the heat storage pipe 51;
if not, it is determined that heat storage is not necessary, and step S614 is executed to control the switching device 8 to close and disconnect the heat storage pipe 51.
Starting up the machine to heat, firstly, operating a heating mode. After the outdoor heat exchanger is started, the coil temperature of the outdoor heat exchange tube 52 is detected between a first preset time and a second preset time, the lowest value (first lowest value) of the coil temperature of the outdoor heat exchanger 3 between the first preset time and the second preset time is obtained, after the second preset time, the coil temperature of the outdoor heat exchanger 3 is detected, the detected coil temperature of the outdoor heat exchanger 3 is compared with the first lowest value, if the difference value between the first lowest value and the coil temperature of the outdoor heat exchanger 3 is larger than or equal to the first preset difference value, it is indicated that the outdoor heat exchanger 3 is frosted, the heat accumulator 5 needs to accumulate heat, the switch device 8 is controlled to be opened, and a refrigerant flows through the heat accumulation tube 51 to accumulate heat. If the difference between the first minimum value and the coil temperature of the outdoor heat exchanger 3 is smaller than the first preset difference, it indicates that the outdoor heat exchanger 3 is not frosted or has a small frosting degree, the heat accumulator 5 does not need to accumulate heat, the switch device 8 is controlled to be closed, and the refrigerant does not flow through the heat accumulation pipe 51.
Therefore, the frosting condition of the outdoor heat exchanger 3 is judged according to the coil temperature of the outdoor heat exchanger 3, whether the heat accumulator 5 needs heat accumulation or not is judged, heat accumulation is not carried out under the working condition that heat accumulation is not needed, and energy loss of the system is reduced.
Further, a first lowest value obtained between the first preset time and the second preset time is a lowest value of the temperature at the outlet of the coil pipe of the outdoor heat exchanger 3 in the refrigeration mode, and the coil pipe temperature of the outdoor heat exchanger 3 detected after the second preset time is also the temperature at the outlet of the coil pipe of the outdoor heat exchanger 3 in the refrigeration mode. It is understood that the first lowest value may also be the lowest value of the temperature at the other positions on the coil of the outdoor heat exchanger 3 except the outlet, and the coil temperature of the outdoor heat exchanger 3 detected after the second preset time is the temperature of the coil at the same position as the first lowest value.
It can be understood that, besides the frosting condition of the outdoor heat exchanger 3 can be judged according to the coil temperature of the outdoor heat exchanger 3, the frosting condition of the outdoor heat exchanger 3 can also be judged according to the outdoor environment temperature.
In one embodiment, the first predetermined time is in a range of 5min to 11min, the second predetermined time is in a range of 11min to 15min, and the first predetermined difference is in a range of 1 ℃ to 3 ℃.
The range of the first preset time is 5-11 min, so that the condition that the first preset time is less than 5min, the air conditioning system is unstable in operation, the acquired first minimum value is inaccurate, and the condition that the frosting condition of the outdoor heat exchanger 3 cannot be found in time due to the fact that the first preset time is more than 11min and the time for acquiring the first minimum value is too late is avoided. The first preset time may be 5min, 7min, 9min or 11 min.
The second preset time is within the range of 11-15 min, so that the condition that the second preset time is less than 11min, the air conditioning system is unstable in operation, the acquired first minimum value is inaccurate, and the condition that the frosting condition of the outdoor heat exchanger 3 cannot be found in time due to the fact that the time for acquiring the first minimum value is too late when the second preset time is greater than 15min is avoided. The second preset time may be 11min, 12min, 13min, 14min or 15 min.
The range of the first preset difference is 1-3 ℃, and the first preset difference is prevented from being smaller than 1 ℃, so that the first preset difference is smaller, and the frosting condition of the outdoor heat exchanger 3 can be judged wrongly; and the situation that the first preset difference is larger than 3 ℃ so that heat accumulation is started only after the outdoor heat exchanger 3 is frosted seriously due to the larger first preset difference is avoided.
After step S614, the control method further includes:
step S616, detecting the lowest value (different from the first lowest value, the lowest value at this position is called as the second lowest value) of the coil temperature of the outdoor heat exchanger 3 between the third preset time and the fourth preset time when the switching device 8 is turned off;
step S618, detecting the coil temperature of the outdoor heat exchanger 3 after the fourth preset time;
step S620, determining whether the difference between the second lowest value and the coil temperature of the outdoor heat exchanger 3 detected in step S618 is greater than or equal to a second preset difference;
if yes, the heat storage is determined to be needed, and step S622 is executed to control the switch device 8 to be turned on so as to conduct the heat storage pipe 51;
if not, it is determined that heat storage is not required, and the process returns to step S614.
And when the situation that heat storage is not needed is judged according to the relation between the difference value between the first lowest value and the coil temperature of the outdoor heat exchanger 3 and the first preset difference value, the switch device 8 is controlled to be closed. After the switching device 8 is turned off, coil temperature of the outdoor heat exchange tube 52 is detected between a third preset time and a fourth preset time, the lowest value (second lowest value) of the coil temperature of the outdoor heat exchanger 3 between the third preset time and the fourth preset time is obtained, after the fourth preset time, the coil temperature of the outdoor heat exchanger 3 is detected, the detected coil temperature of the outdoor heat exchanger 3 is compared with the second lowest value, if the difference value between the second lowest value and the coil temperature of the outdoor heat exchanger 3 is larger than or equal to the second preset difference value, it is indicated that the outdoor heat exchanger 3 is frosted, the heat accumulator 5 needs to accumulate heat, the switching device 8 is controlled to be turned on, and a refrigerant flows through the heat accumulation tube 51 to accumulate heat. If the difference between the second lowest value and the coil temperature of the outdoor heat exchanger 3 is smaller than the second preset difference, it indicates that the outdoor heat exchanger 3 is not frosted or has a small frosting degree, the heat accumulator 5 does not need to accumulate heat, the switch device 8 is controlled to be closed, and the refrigerant does not flow through the heat accumulation pipe 51.
Therefore, the frosting condition of the outdoor heat exchanger 3 is judged according to the coil temperature of the outdoor heat exchanger 3, whether the heat accumulator 5 needs heat accumulation or not is judged, heat accumulation is not carried out under the working condition that heat accumulation is not needed, and energy loss of the system is reduced.
Further, a second lowest value obtained between the third preset time and the fourth preset time is a lowest value of the temperature at the outlet of the coil pipe of the outdoor heat exchanger 3 in the refrigeration mode, and the coil pipe temperature of the outdoor heat exchanger 3 detected after the fourth preset time is also the temperature at the outlet of the coil pipe of the outdoor heat exchanger 3 in the refrigeration mode. It is understood that the second lowest value may also be the lowest value of the temperature at the other positions on the coil of the outdoor heat exchanger 3 except for the outlet, and the coil temperature of the outdoor heat exchanger 3 detected after the fourth preset time is the temperature of the coil at the same position as the second lowest value.
In one embodiment, the third predetermined time is in a range of 5min to 11min, the fourth predetermined time is in a range of 11min to 15min, and the second predetermined difference is in a range of 1 ℃ to 3 ℃.
The third preset time is within a range of 5min to 11min, if the third preset time is less than 5min, the time for judging whether the outdoor heat exchanger 3 frosts is short according to the first lowest value, the outdoor heat exchanger 3 does not frost or the frosting degree is low, whether the heat accumulator 5 needs to accumulate heat is not needed, and the condition that the frosting condition of the outdoor heat exchanger 3 cannot be found in time due to the fact that the time for acquiring the second lowest value is too late when the third preset time is greater than 11min is also avoided. The third preset time may be 5min, 7min, 9min or 11 min.
The range of the fourth preset time is 11-15 min, so that the fourth preset time is prevented from being smaller than 11min, the time for judging whether the outdoor heat exchanger 3 frosts is short according to the first lowest value, the outdoor heat exchanger 3 does not frost or the frosting degree is low, whether the heat accumulator 5 needs to accumulate heat is not needed to be judged, and the condition that the frosting condition of the outdoor heat exchanger 3 cannot be found in time due to the fact that the time for acquiring the second lowest value is too late when the fourth preset time is larger than 15min is also avoided. The fourth preset time may be 11min, 12min, 13min, 14min or 15 min.
The range of the second preset difference is 1-3 ℃, and the second preset difference is prevented from being smaller than 1 ℃, so that the second preset difference is smaller, and the frosting condition of the outdoor heat exchanger 3 can be judged wrongly; and the second preset difference value is prevented from being larger than 3 ℃, so that heat storage is started only after the outdoor heat exchanger 3 is frosted seriously due to the larger second preset difference value.
In one embodiment, the heat accumulator 5 comprises a heat exchange tube 52, the air conditioner comprises a reversing piece 6, the reversing piece 6 comprises a first connecting port e to a third connecting port g, the second connecting port f is connected with the air inlet 12 of the compressor through a connecting pipeline, one end of the heat exchange tube 52 is connected with the third connecting port g, and the heat exchange tube 52 is connected with the connecting pipeline in parallel, and the control method comprises the following steps:
step S624, judging whether defrosting is needed in a heating mode;
step S626, judging that defrosting is needed, controlling the switch device 8 to be closed, and controlling the first connecting port e of the reversing piece 6 to be communicated with the third connecting port g, so that a refrigerant flows through the heat exchange tube 52 to defrost;
if yes, returning to step S622;
step S628, judging whether a preset condition is met;
if yes, executing step S630 to quit defrosting, executing a normal heating mode, and returning to step S604; if not, the process returns to step S626 to continue defrosting.
When it is determined that defrosting is necessary, the control switch device 8 is turned off, the heat storage pipe 51 is disconnected, and the heat storage 5 stops storing heat.
The first connection port e is communicated with the third connection port g, the refrigerant is controlled to flow through the heat exchange tube 52, the refrigerant is evaporated in the heat exchange tube 52 to absorb heat, and is condensed in the outdoor heat exchanger 3 to release heat, so that defrosting of the outdoor heat exchanger 3 is realized.
In one embodiment, in step S628, the preset condition includes that the coil temperature of the outdoor heat exchanger 3 is greater than a first preset temperature, or the coil temperature of the outdoor heat exchanger 3 is greater than a second preset temperature within a preset time period, wherein the first preset temperature is greater than the second preset temperature.
The temperature of the coil of the outdoor heat exchanger 3 is higher than a first preset temperature, which indicates that the defrosting of the outdoor heat exchanger 3 is completed, and the defrosting mode can be exited. Or the temperature of the coil of the outdoor heat exchanger 3 is greater than a second lower preset temperature within a preset time, which also indicates that defrosting of the outdoor heat exchanger 3 is completed, and the defrosting mode can be exited.
Further, the coil temperature of the outdoor heat exchanger 3 in the preset condition is the lowest value of the temperature at the coil inlet of the outdoor heat exchanger 3 in the cooling mode. It is understood that the coil temperature of the outdoor heat exchanger 3 in the preset condition may also be a temperature at a position other than the inlet on the coil of the outdoor heat exchanger 3.
In one embodiment, the first predetermined temperature is in a range of 6-12 deg.C, the second predetermined temperature is in a range of 3-8 deg.C, and the predetermined time period is in a range of 20-60 s.
The first preset temperature is in the range of 6-12 ℃, the first preset temperature is prevented from being smaller than 6 ℃, the defrosting effect of the outdoor heat exchanger 3 is poor, and the first preset temperature is also prevented from being larger than 12 ℃, so that the outdoor heat exchanger 3 still operates in a defrosting mode after defrosting is finished, and the energy waste of the system is caused. The first preset temperature may be, but is not limited to, 6 ℃, 8 ℃, 10 ℃ or 12 ℃.
The second preset temperature is in a range of 3-8 ℃, the second preset temperature is prevented from being lower than 3 ℃, the defrosting effect of the outdoor heat exchanger 3 is poor, and the second preset temperature is also prevented from being higher than 8 ℃, so that the outdoor heat exchanger 3 still operates in a defrosting mode after defrosting is finished, and the energy waste of the system is caused. The second preset temperature may be, but is not limited to, 3 ℃, 6 ℃, or 8 ℃.
The preset time is within the range of 20 s-60 s, the condition that the defrosting effect of the outdoor heat exchanger 3 is poor due to the fact that the preset time is less than 20s is avoided, and the condition that the defrosting mode is operated after the defrosting of the outdoor heat exchanger 3 is finished due to the fact that the preset time is more than 60s is also avoided, and the energy waste of the system is caused. The preset time period may be, but is not limited to, 20s, 40s, or 60 s.
If the refrigeration mode is started, step S632 is executed, the switch device is controlled to be turned off, the heat storage pipe is disconnected, no high-temperature refrigerant passes through the heat storage pipe, and the heat accumulator does not store heat.
In one particular embodiment, the diverter includes a one-way valve and a solenoid valve. The control method includes steps S702-S724.
Step S702, detecting a starting mode;
if the heating mode is selected, executing step S704 to control the electromagnetic valve to be closed;
step S706, detecting a minimum value T30 of a temperature T3 at an outlet of the indoor and outdoor heat exchanger coil (in a cooling mode) in a time period T1-T2, where for example, a time T1 may be a time 7min from the start of heating, and a time T2 may be a time 12min from the start of heating;
step S708, detecting the real-time T3 temperature;
step S710, judging whether T30-T3 is more than or equal to △ T1, wherein △ T1 can be 1 ℃;
if yes, the frosting of the outdoor heat exchanger is indicated, the electromagnetic valve is opened in step S712, and the heat accumulator starts to accumulate heat;
if not, executing step S722 electromagnetic valve closing; after step S722, returning to step S706, when step S706 is executed this time, t1 and t2 are the time from the closing of the electromagnetic valve in step S722, for example, time t1 may be the time from the closing of the electromagnetic valve in step S722 for 7min, and time t2 may be the time from the closing of the electromagnetic valve in step S722 for 12 min;
after step S712, step S714 is executed to determine whether defrosting is needed, for example, whether defrosting is needed may be determined by detecting the temperature of the coil of the outdoor heat exchanger or detecting the outdoor environment temperature;
if yes, go to step S716 to enter defrosting mode;
if not, the process returns to step S712 to continue heat storage;
step S718, detecting the temperature T5 at the coil inlet (in the cooling mode) of the real-time outdoor heat exchanger, and judging whether T5 is more than or equal to T50 or T5 is more than or equal to T51 for T3 time, for example, T50 can be 8 ℃, T51 can be 6 ℃, and T3 can be 40S;
if yes, executing step S720 to quit defrosting;
if not, the process returns to step S716.
If the mode is the cooling mode, step S722 is executed, the electromagnetic valve is closed, and the heat storage pipe of the heat accumulator is disconnected, so that no high-temperature and high-pressure refrigerant passes through and no heat is stored.
As shown in fig. 8, an embodiment of the second aspect of the present invention provides a control apparatus 200, which includes a processor 206 and a memory 204, wherein the processor 206 is configured to implement the steps of the control method according to any one of the embodiments of the first aspect when executing the computer program stored in the memory 204.
An embodiment of the third aspect of the present invention provides an air conditioner including the control device 200 as the embodiment of the second aspect.
An embodiment of the fourth aspect of the invention provides a computer-readable storage medium on which a computer program (instructions) is stored, which computer program (instructions), when executed by the processor 206, implements the steps of the control method as in any one of the embodiments of the first aspect.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage mediums comprising computer-usable program code(s) (including, but not limited to, disk storage 204, CD-ROM, optical storage 204, etc.).
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor 206 of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor 206 of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory 204 that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory 204 produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It should be noted that in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
In the description of the present invention, the term "plurality" means two or more unless explicitly specified or limited otherwise; the terms "connected," "secured," and the like are to be construed broadly and unless otherwise stated or indicated, and for example, "connected" may be a fixed connection, a removable connection, an integral connection, or an electrical connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
It will be apparent to those skilled in the art that various changes and modifications may be made therein without departing from the scope of the invention as defined in the appended claims and their equivalents, and it is intended that the invention encompass such changes and modifications as well.

Claims (11)

1. A control method of an air conditioner is characterized in that the air conditioner comprises an indoor heat exchanger and a heat accumulator, the heat accumulator comprises a heat accumulation pipe, the heat accumulation pipe is connected with the indoor heat exchanger in parallel, a switch device for controlling the on-off of the heat accumulation pipe is connected onto the heat accumulation pipe, and the control method comprises the following steps:
judging whether heat storage is needed or not according to working condition parameters of the air conditioner;
and judging that heat accumulation is needed, and controlling the switching device to be started so as to conduct the heat accumulation pipe.
2. The control method according to claim 1, wherein the operating condition parameter includes a coil temperature of the outdoor heat exchanger, and the determining whether heat storage is required according to the operating condition parameter of the air conditioner specifically includes:
starting up the machine for heating and controlling the switch device to be closed;
detecting a first lowest value of the coil temperature of the outdoor heat exchanger between a first preset time and a second preset time when the outdoor heat exchanger is started to heat;
detecting the temperature of a coil of the outdoor heat exchanger after a second preset time;
if the difference value between the first lowest value and the coil temperature of the outdoor heat exchanger is greater than or equal to a first preset difference value, judging that heat storage is needed;
and if the difference value between the first lowest value and the coil temperature of the outdoor heat exchanger is smaller than the first preset difference value, judging that heat storage is not needed, and controlling the switching device to be closed so as to disconnect the heat storage pipe.
3. The control method according to claim 2,
the range of the first preset time is 5-11 min, the range of the second preset time is 11-15 min, and the range of the first preset difference is 1-3 ℃.
4. The control method according to claim 2, further comprising, after controlling the switching device to be turned off to disconnect the heat storage pipe:
detecting a second lowest value of the coil temperature of the outdoor heat exchanger between a third preset time and a fourth preset time when the switching device is turned off;
detecting the temperature of a coil of the outdoor heat exchanger after a fourth preset time;
if the difference value between the second lowest value and the coil temperature of the outdoor heat exchanger is greater than or equal to a second preset difference value, judging that heat storage is needed;
and if the difference value between the second lowest value and the coil temperature of the outdoor heat exchanger is smaller than the second preset difference value, judging that heat storage is not needed, and returning to the detection of the second lowest value of the coil temperature of the outdoor heat exchanger between the third preset time and the fourth preset time when the switching device is closed.
5. The control method according to claim 4,
the range of the third preset time is 5-11 min, the range of the fourth preset time is 11-15 min, and the range of the second preset difference is 1-3 ℃.
6. The control method according to any one of claims 1 to 5, wherein the heat accumulator includes a heat exchange tube, the air conditioner includes a direction changer including a first connection port to a third connection port, the second connection port is connected to an air inlet of the compressor through a connection pipe, one end of the heat exchange tube is connected to the third connection port, and the heat exchange tube is connected in parallel to the connection pipe, the control method comprising:
and under the heating mode, the defrosting is judged to be needed, the switching device is controlled to be closed, and the first connecting port of the reversing piece is controlled to be communicated with the third connecting port, so that the refrigerant flows through the heat exchange tube until the preset condition is met.
7. The control method of claim 6, wherein the preset condition comprises a coil temperature of the outdoor heat exchanger being greater than a first preset temperature, or the coil temperature of the outdoor heat exchanger being greater than a second preset temperature for a preset duration, wherein the first preset temperature is greater than the second preset temperature.
8. The control method according to claim 7,
the first preset temperature range is 6-12 ℃, the second preset temperature range is 3-8 ℃, and the preset duration range is 20-60 s.
9. A control apparatus of an air conditioner, characterized in that the control apparatus comprises a processor and a memory, the processor being configured to implement the steps of the control method of the air conditioner according to any one of claims 1 to 8 when executing a computer program stored in the memory.
10. An air conditioner, comprising: the control device of an air conditioner according to claim 9.
11. A computer-readable storage medium on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the control method of an air conditioner according to any one of claims 1 to 8.
CN201911023688.4A 2019-10-25 2019-10-25 Air conditioner, control method and device thereof, and computer-readable storage medium Pending CN110715484A (en)

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