CN112856718A - Air conditioner, control method thereof and storage medium - Google Patents
Air conditioner, control method thereof and storage medium Download PDFInfo
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- CN112856718A CN112856718A CN201911211593.5A CN201911211593A CN112856718A CN 112856718 A CN112856718 A CN 112856718A CN 201911211593 A CN201911211593 A CN 201911211593A CN 112856718 A CN112856718 A CN 112856718A
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- 238000000034 method Methods 0.000 title claims abstract description 49
- 239000003507 refrigerant Substances 0.000 claims abstract description 77
- 238000010257 thawing Methods 0.000 claims abstract description 53
- 238000010438 heat treatment Methods 0.000 claims abstract description 43
- 238000004781 supercooling Methods 0.000 claims description 45
- 238000005057 refrigeration Methods 0.000 abstract description 18
- 230000000694 effects Effects 0.000 description 16
- 238000001816 cooling Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 239000007788 liquid Substances 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000007791 dehumidification Methods 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—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
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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
- F24F11/70—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
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Thermal Sciences (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a control method of an air conditioner, wherein a first throttle valve and an electromagnetic valve are connected between an indoor heat exchanger and an outdoor heat exchanger of the air conditioner, the first throttle valve is connected with the electromagnetic valve in parallel, and the control method of the air conditioner comprises the following steps: the method comprises the steps that when the air conditioner runs in a heating mode, temperature parameters of an outdoor heat exchanger of the air conditioner are obtained; when the temperature parameter meets the frosting condition, controlling the electromagnetic valve to be opened so as to defrost the outdoor heat exchanger; and controlling the electromagnetic valve to be closed when the defrosting is finished. The invention also discloses an air conditioner and a storage medium. According to the invention, the refrigerant from the indoor heat exchanger directly enters the outdoor heat exchanger, the temperature of the outdoor heat exchanger is raised by the refrigerant, the frost on the surface of the outdoor heat exchanger is removed after the temperature of the outdoor heat exchanger is raised, the defrosting of the outdoor heat exchanger is realized under the condition of not switching the refrigeration mode, and the influence of the refrigeration mode on the indoor thermal comfort can be avoided.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner, a control method thereof and a storage medium.
Background
When the air conditioner heats, high-temperature and high-pressure refrigerant compressed by the compressor enters the indoor unit, the refrigerant coming out of the indoor unit is throttled by the electronic expansion valve and returns to the compressor after being evaporated and absorbed by the outdoor unit, and heating circulation is completed. Generally, an air conditioner is required to operate to heat in a northern low-temperature environment, in the low-temperature environment heating process, along with the reduction of the outdoor environment temperature, a heat exchanger of an outdoor unit is easy to frost, the heat exchange effect of the outdoor unit after frosting is poor, and the indoor room heating output capacity is reduced, at the moment, the air conditioner needs to be switched to a refrigeration mode to defrost the outdoor heat exchanger, and when the air conditioner operates in the refrigeration mode, the indoor environment temperature is reduced, and the room thermal comfort is influenced.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention mainly aims to provide a control method of an air conditioner, the air conditioner and a storage medium, and aims to solve the technical problem that the defrosting process of the existing air conditioner influences the indoor thermal comfort.
In order to achieve the above object, the present invention provides a method for controlling an air conditioner, wherein a first throttle valve and an electromagnetic valve are connected between an indoor heat exchanger and an outdoor heat exchanger of the air conditioner, the first throttle valve is connected in parallel with the electromagnetic valve, and the method for controlling the air conditioner comprises the following steps:
the method comprises the steps that when the air conditioner runs in a heating mode, temperature parameters of an outdoor heat exchanger of the air conditioner are obtained;
when the temperature parameter meets the frosting condition, controlling the electromagnetic valve to be opened so as to defrost the outdoor heat exchanger;
and controlling the electromagnetic valve to be closed when the defrosting is finished.
Optionally, meeting the frosting condition includes at least one of:
the outdoor temperature is lower than a first preset temperature;
the difference value between the current outlet temperature of the outdoor heat exchanger and the initial outlet temperature of the outdoor heat exchanger is larger than a first preset value;
and the surface temperature of the outdoor heat exchanger is lower than a second preset temperature.
Optionally, after the step of controlling the solenoid valve to be opened to defrost the outdoor heat exchanger, the control method of the air conditioner further includes:
acquiring the time length of the electromagnetic valve kept in an open state;
and when the time length reaches the holding time length, executing the step of acquiring the temperature parameter of the outdoor heat exchanger of the air conditioner.
Optionally, the holding time period is determined according to a difference between an outlet temperature of the outdoor heat exchanger and an initial outlet temperature of the outdoor heat exchanger when the frosting condition is met, and the holding time period is longer when the difference is larger.
Optionally, a supercooling pipe is connected in series between the first throttle valve and the indoor heat exchanger, the supercooling pipe is arranged on the air inlet side of the outdoor heat exchanger, a branch is connected in parallel to the supercooling pipe, a second throttle valve is arranged on the branch, and the second throttle valve is in a fully-opened state in a heating mode; and when the step of controlling the electromagnetic valve to be opened so as to defrost the outdoor heat exchanger is executed, the following steps are also executed:
controlling the second throttle valve to close.
Optionally, after the step of controlling the solenoid valve to open to defrost the outdoor heat exchanger, the method further includes:
after the electromagnetic valve is opened for a preset time, acquiring the difference value between the outlet temperature of the outdoor heat exchanger and the initial outlet temperature of the outdoor heat exchanger;
and switching the four-way valve of the air conditioner when the outlet temperature is lower than a third preset temperature and the difference value is higher than a second preset value.
In order to achieve the above object, the present invention further provides an air conditioner, wherein the air conditioner comprises a compressor, a four-way valve, an indoor heat exchanger, a first throttle valve and an outdoor heat exchanger, and the compressor, the four-way valve, the indoor heat exchanger, the first throttle valve and the outdoor heat exchanger are sequentially connected to form a refrigerant circulation flow path; the first throttle valve is connected with the electromagnetic valve in parallel, the air conditioner further comprises a memory, a processor and a control program which is stored on the memory and can run on the processor, the processor is in signal connection with the first throttle valve, the second throttle valve, the four-way valve and the compressor, and the control program realizes the steps of the control method of the air conditioner when being executed by the processor.
Optionally, the air conditioner further includes a supercooling pipe, the supercooling pipe is disposed at an air inlet side of the outdoor heat exchanger, and the supercooling pipe is connected between the indoor heat exchanger and the first throttle valve.
Optionally, a branch connected in parallel with the supercooling pipe is arranged between the indoor heat exchanger and the first throttling valve, a second throttling valve is arranged on the branch, and the second throttling valve is in signal connection with the processor.
Furthermore, the present invention also provides a storage medium having a control program stored thereon, which when executed by a processor implements the steps of the control method of the air conditioner as described above.
According to the control method of the air conditioner, the air conditioner and the storage medium provided by the embodiment of the invention, when the air conditioner operates in a heating mode, if an outdoor heat exchanger of the air conditioner meets a frosting condition, an electromagnetic valve connected in parallel with a first throttle valve between the outdoor heat exchanger and an indoor heat exchanger is controlled to be opened, after the electromagnetic valve is opened, a refrigerant directly flows to the outdoor heat exchanger from the electromagnetic valve without throttling, the refrigerant coming out of the indoor heat exchanger directly enters the outdoor heat exchanger without throttling, the temperature of the outdoor heat exchanger is raised by the refrigerant, frost on the surface of the outdoor heat exchanger is removed after the temperature of the outdoor heat exchanger is raised, the outdoor heat exchanger is defrosted under the condition that the refrigeration mode is not switched, and the influence of the refrigeration mode on indoor thermal comfort.
Drawings
Fig. 1 is a schematic terminal structure diagram of a hardware operating environment according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an embodiment of an air conditioner according to the present invention;
FIG. 3 is a schematic structural view of another embodiment of an air conditioner according to the present invention;
FIG. 4 is a schematic flow chart illustrating a control method of an air conditioner according to a first embodiment of the present invention;
FIG. 5 is a flow chart illustrating a control method of an air conditioner according to a second embodiment of the present invention;
FIG. 6 is a flow chart illustrating a control method of an air conditioner according to a third embodiment of the present invention;
fig. 7 is a flowchart illustrating a control method of an air conditioner according to a fourth embodiment of the present invention.
The reference numbers illustrate:
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration and are not intended to limit the invention.
The main solution of the embodiment of the invention is as follows: the method comprises the steps that when the air conditioner runs in a heating mode, temperature parameters of an outdoor heat exchanger of the air conditioner are obtained; when the temperature parameter meets the frosting condition, controlling the electromagnetic valve to be opened so as to defrost the outdoor heat exchanger; and controlling the electromagnetic valve to be closed when the defrosting is finished. The electromagnetic valve is a valve connected in parallel with a first throttling valve between the outdoor heat exchanger and the indoor heat exchanger, the electromagnetic valve is in a closed state during normal heating, when the temperature of the outdoor heat exchanger meets the frosting condition, the electromagnetic valve is opened, a branch where the electromagnetic valve is located is opened, so that a refrigerant directly enters the outdoor heat exchanger without passing through the first throttling valve, the outdoor heat exchanger is defrosted, and the defrosting of the outdoor heat exchanger is realized under the condition that the refrigeration mode is not switched.
As shown in fig. 1, fig. 1 is a schematic terminal structure diagram of a hardware operating environment according to an embodiment of the present invention.
The terminal is an air conditioner, and the terminal can also be a control device of the air conditioner.
As shown in fig. 1, the terminal may include: a processor 1001, such as a CPU, a memory 1005, and a communication bus 1002. Wherein a communication bus 1002 is used to enable connective communication between these components. The memory 1005 may be a high-speed RAM memory or a non-volatile memory (e.g., a magnetic disk memory). The memory 1005 may alternatively be a storage device separate from the processor 1001.
Optionally, the terminal may further include a network interface 1004 and a user interface 1003, where the user interface 1003 may include a Display screen (Display) and an input unit such as a front panel operation keyboard, the Display screen is used to Display operation parameters of the air conditioner, the front panel operation keyboard is used to input setting operations such as setting temperature, and the optional user interface 1003 may further include a standard wired interface and a standard wireless interface. The network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface). Optionally, the terminal may further include a camera, a sensor, and the like. Among them, sensors such as temperature sensors, humidity sensors, wind speed sensors, etc. Specifically, the temperature sensor is used for detecting indoor temperature, outdoor temperature, indoor heat exchanger temperature, outdoor heat exchanger temperature and the like, the humidity sensor is used for detecting indoor humidity, outdoor humidity and the like, the wind speed sensor is used for detecting wind speed and the like of an air outlet of the air conditioner, and the sensor is connected with the processor 1001. The memory 1005 stores therein a control program that implements the various embodiments of the control method of the air conditioner listed below when the processor 1001 executes.
Those skilled in the art will appreciate that the terminal structure shown in fig. 1 is not intended to be limiting and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.
Further, referring to fig. 2, the air conditioner of the present embodiment includes a compressor 10, a four-way valve 20, an indoor heat exchanger 30, a first throttle valve 40, and an outdoor heat exchanger 50, wherein the compressor 10, the four-way valve 20, the indoor heat exchanger 30, the first throttle valve 40, and the outdoor heat exchanger 50 are sequentially connected to form a refrigerant circulation flow path. The compressor 10, the four-way valve 20, the indoor heat exchanger 30, the first throttle valve 40 and the outdoor heat exchanger 50 are connected by pipelines, and a refrigerant flows in the pipelines and forms heat exchange with air in the indoor heat exchanger 30 or the outdoor heat exchanger 50, so that the heating or the cooling of the air is realized.
Specifically, after being discharged from the outlet of the compressor 10, the refrigerant passes through the four-way valve 20, the indoor heat exchanger 30, the first throttle valve 40, and the outdoor heat exchanger 50 in sequence through the pipeline, and then returns to the compressor 10, thereby forming a heating cycle flow path. The refrigerant is compressed by the compressor 10 to become high-temperature high-pressure gas, is discharged from the compressor 10, flows to the indoor heat exchanger 30 through the four-way valve 20, exchanges heat with air, is condensed into a normal-temperature high-pressure liquid state in the indoor heat exchanger 30, then flows to the first throttle valve 40, enters the outdoor heat exchanger 50 under the throttling action of the first throttle valve 40, exchanges heat with the heat of the air, is evaporated into a low-temperature low-pressure gas state in the outdoor heat exchanger 50, and finally flows back to the compressor 10, so that the heating cycle of the air conditioner is completed.
Generally, in a low-temperature environment, the air conditioner is started to heat only when the ambient temperature rises, so that the air conditioner generally heats in the low-temperature environment, the surface of the outdoor heat exchanger 50 is easy to frost in the low-temperature environment, and therefore, in order to prevent the heating performance of the air conditioner from being affected after the surface of the outdoor heat exchanger 50 is frosted, the air conditioner in the embodiment of the invention is provided with a heating and defrosting circulation loop, and when the surface of the outdoor heat exchanger 50 is frosted, the refrigerant of the air conditioner is defrosted by the heating and defrosting circulation loop to the outdoor heat exchanger 50. Specifically, the air conditioner further includes an electromagnetic valve 90, the first throttle valve 40 is connected in parallel with the electromagnetic valve 90, the heating circulation loop is formed when the refrigerant flowing out of the indoor heat exchanger 30 flows from the first throttle valve 40 to the outdoor heat exchanger 50, the heating and defrosting circulation loop is formed when the refrigerant flowing out of the indoor heat exchanger 30 flows from the electromagnetic valve 90 to the outdoor heat exchanger 50, when the air conditioner operates in a normal heating circulation loop, the electromagnetic valve 90 is in a closed state, a branch where the electromagnetic valve 90 is located is not conductive, the refrigerant cannot directly flow to the outdoor heat exchanger 50 after flowing out of the indoor heat exchanger 30, when the air conditioner operates in a heating defrosting mode, the electromagnetic valve 90 is opened, the refrigerant is compressed by the compressor 10 to become high-temperature and high-pressure gas, is discharged from the compressor 10, and flows to the indoor heat exchanger 30 through the four-way valve 20, the high-temperature and high-pressure refrigerant exchanges heat with air, the refrigerant is condensed into a normal-temperature and high-pressure liquid refrigerant in the indoor heat exchanger 30, the electromagnetic valve 90 is opened, the refrigerant coming out of the indoor heat exchanger 30 directly enters the outdoor heat exchanger 50 from the electromagnetic valve 90, then flows back into the compressor 10 through the outdoor heat exchanger 50, the normal-temperature and high-pressure refrigerant enters the outdoor heat exchanger 50, the temperature in the pipe of the outdoor heat exchanger 50 rises, frost on the outer surface of the outdoor heat exchanger 50 preheats water, and the surface of the outdoor heat exchanger 50 is defrosted under the condition that the refrigeration mode is not switched during low-temperature heating.
It can be understood that, when the air conditioner does not remove the frost on the surface of the outdoor heat exchanger 50 during the above defrosting operation, the air conditioner switches the cooling mode to remove the frost on the surface of the outdoor heat exchanger 50, and when the air conditioner switches the cooling mode, the electromagnetic valve 90 is closed, or the electromagnetic valve 90 is a check valve, and when the check valve is opened, only the flow path from the indoor heat exchanger 30 to the outdoor heat exchanger 50 is conducted, and the flow path from the outdoor heat exchanger 50 to the indoor heat exchanger 30 is not conducted, so that the refrigerant can only flow from the first throttle valve 40 to the indoor heat exchanger 30 when the air conditioner switches the cooling mode. Specifically, by switching the flow direction of the four-way valve 20, after the refrigerant is discharged from the outlet of the compressor 10, the refrigerant flows to the outdoor heat exchanger 50 through the four-way valve 20, the high-temperature and high-pressure refrigerant greatly increases the pipe temperature of the outdoor heat exchanger 50, so that the defrosted water on the surface of the outdoor heat exchanger 50 increases the defrosting strength, the high-temperature and high-pressure refrigerant flows to the first throttle valve 40 after heat exchange in the outdoor heat exchanger 50, the refrigerant forms a low-temperature and low-pressure liquid under the throttling action of the first throttle valve 40, the low-temperature and low-pressure liquid refrigerant flows to the indoor heat exchanger 30, exchanges heat with air in the indoor heat exchanger 30, evaporates into a low-temperature and low-pressure gas in the indoor heat exchanger 30.
Further, in order to improve the defrosting effect of the outdoor heat exchanger 50, especially improve the defrosting effect of the surface of the outdoor heat exchanger 50 under the condition that the refrigeration mode is not switched during low-temperature heating, the air conditioner in this embodiment further includes a supercooling pipe 60, the supercooling pipe 60 is disposed at the air inlet side of the outdoor heat exchanger 50, and the supercooling pipe 60 is connected between the indoor heat exchanger 30 and the first throttle valve 40.
The supercooling pipe 60 may be a coil pipe formed at random, the supercooling pipe 60 is disposed on the heat exchange pipe facing the air intake side of the outdoor heat exchanger 50, the supercooling pipe 60 is located between the outdoor heat exchanger 50 and the outdoor fan 70, and when the outdoor fan 70 rotates, the air at the outdoor side enters from the air inlet, passes through the supercooling pipe 60, and then blows toward the outdoor heat exchanger 50.
The supercooling pipe 60 is connected in series between the indoor heat exchanger 30 and the first throttle valve 40, and in the refrigeration process, the refrigerant coming out of the indoor heat exchanger 30 passes through the supercooling pipe 60, and after exchanging heat with the air at the air inlet side of the outdoor heat exchanger 50 in the supercooling pipe 60, the refrigerant flows to the first throttle valve 40 and further flows to the outdoor heat exchanger 50. In this embodiment, after the refrigerant enters the supercooling pipe 60, the refrigerant exchanges heat with the low-temperature air in the supercooling pipe 60, so that the temperature of the gas blown to the outdoor heat exchanger 50 is increased, on one hand, the gas blown to the outdoor heat exchanger 50 is prevented from being too low in temperature and frosting on the surface of the outdoor heat exchanger 50, on the other hand, the frost on the surface of the outdoor heat exchanger 50 can be defrosted, and the effect of defrosting the surface of the outdoor heat exchanger 50 under the condition that the heating mode is not switched during low-temperature heating is further improved.
In addition, after the refrigerant passes through the supercooling pipe 60, the refrigerant is further cooled, and when the further cooled refrigerant flows to the outdoor heat exchanger 50, the difference between the inlet temperature and the outlet temperature of the outdoor heat exchanger 50 is increased, so that the enthalpy difference value between the inlet temperature and the outlet temperature of the outdoor heat exchanger 50 is increased, and the heating effect of the system is further improved.
In another embodiment, referring to fig. 3, based on the air conditioner in the above embodiment, a branch connected in parallel with the supercooling pipe 60 is provided between the indoor heat exchanger 30 and the first throttle valve 40, and a second throttle valve 80 is provided on the branch. The second throttle valve 80 is used for controlling the branch to be conducted or closed, and when the air conditioner performs defrosting, the second throttle valve 80 is controlled to be closed, so that the refrigerant flows to the supercooling pipe 60 and then flows to the electromagnetic valve 90; when the air conditioner heats normally, the second throttle valve 80 is opened to the maximum opening degree according to the requirement, the refrigerant flows out of the indoor heat exchanger 30 and then directly flows to the first throttle valve 40 through the branch, and the refrigerant does not pass through the supercooling pipe 60.
It is to be noted that the first throttle valve 40 and the second throttle valve 80 in the above embodiments may be electronic expansion valves.
Based on the air conditioner system, the present invention provides a first embodiment of a method for controlling an air conditioner, and referring to fig. 4, the method for controlling an air conditioner includes the following steps:
step S10, when the air conditioner runs in a heating mode, acquiring the temperature parameter of the outdoor heat exchanger of the air conditioner;
step S20, when the temperature parameter meets the frosting condition, the electromagnetic valve is controlled to be opened so as to defrost the outdoor heat exchanger;
and step S30, controlling the electromagnetic valve to close when the defrosting is finished.
The execution terminal of this embodiment may be an air conditioner or a control device of the air conditioner, and this embodiment exemplifies a real-time process of the air conditioner.
The air conditioner comprises a compressor, a four-way valve, an indoor heat exchanger, a first throttling valve, an electromagnetic valve and an outdoor heat exchanger, wherein the compressor, the four-way valve, the indoor heat exchanger, the first throttling valve and the outdoor heat exchanger are sequentially connected to form a first refrigerant circulating flow path, and the compressor, the four-way valve, the indoor heat exchanger, the electromagnetic valve and the outdoor heat exchanger are sequentially connected to form a second refrigerant circulating flow path. And when the refrigerant flows in the first refrigerant circulation loop, the air conditioner can realize refrigeration or heating. And defrosting the outdoor heat exchanger under the heating mode of the air conditioner is realized when the refrigerant flows in the second refrigerant circulation loop. The electromagnetic valve is in a closed state during normal heating, that is, the second refrigerant circulation loop does not work.
When the air conditioner operates in a heating mode, particularly operates in a low-temperature environment for heating, an outdoor heat exchanger of the air conditioner is easy to frost, and after the outdoor heat exchanger frosts, the heat exchange effect of the outdoor heat exchanger is reduced, so that the heating effect of the air conditioner is reduced. The method comprises the steps of acquiring temperature parameters of an outdoor heat exchanger in real time or at regular time in the process of a heating mode of an air conditioner, determining whether the outdoor heat exchanger frosts or not according to the temperature parameters of the outdoor heat exchanger, and controlling an electromagnetic valve to be opened if the surface of the outdoor heat exchanger frosts so as to defrost the outdoor heat exchanger. Specifically, the determination manner that the frosting condition is satisfied includes at least one of:
1. the outdoor ambient temperature is less than a first preset temperature. The first preset temperature is a critical value of the frosting temperature, and when the outdoor environment temperature is lower than the critical value of the frosting temperature, moisture in the air is condensed into frost.
2. And the difference value between the current outlet temperature of the outdoor heat exchanger and the initial outlet temperature of the outdoor heat exchanger is greater than a first preset value. The initial outlet temperature of the outdoor heat exchanger is the outlet temperature value of the outdoor heat exchanger after the air conditioner is started to operate for the first time t1, the air conditioner is in a stable operation state after the time period t1 of the operation of the air conditioner is set in this embodiment, at this time, the heating effect of the air conditioner is good, t1 may be selected to be 10min, the outlet temperature of the outdoor heat exchanger is detected in real time or at regular time in the operation process of the air conditioner, the current outlet temperature is the outlet temperature of the currently detected outdoor heat exchanger, the current outlet temperature of the outdoor heat exchanger is detected after the time period t2 ═ 30min of the operation of the air conditioner, when the difference value between the current outlet temperature and the initial temperature is greater than a first preset value, the change value of the outlet temperature of the outdoor heat exchanger is larger, the reason that the change value of the outlet temperature of the outdoor heat exchanger is large is that the heat exchange effect of the outdoor heat exchanger is reduced is that the surface The most probable reason in the environment), and based on the judgment, setting the judgment mode meeting the frosting condition further comprises that when the difference value between the current outlet temperature and the initial temperature of the outdoor heat exchanger is greater than a first preset value, the surface of the outdoor heat exchanger is frosted. Wherein, the ratio of the first preset value to the initial outlet temperature is 0.15-0.25), and in a more preferred embodiment, the ratio of the first preset value to the initial outlet temperature is 0.2.
3. And the surface temperature of the outdoor heat exchanger is lower than a second preset temperature. The second preset temperature is frosting temperature, after the surface of the outdoor heat exchanger is frosted, the surface temperature of the outdoor heat exchanger is close to the frosting temperature, and when the surface temperature of the outdoor heat exchanger is detected to be lower than the second preset temperature, it is judged that the surface of the outdoor heat exchanger is frosted.
4. Or, a photographing device can be further arranged on the outdoor unit of the air conditioner, image information of the surface of the outdoor heat exchanger is obtained through the photographing device, and whether the outdoor heat exchanger frosts or not is judged according to the image information.
After the temperature parameter of the outdoor heat exchanger is judged to meet the frosting condition, the principle that the defrosting of the outdoor heat exchanger can be realized by controlling the electromagnetic valve to be opened is as follows: the electromagnetic valve is connected between the outdoor heat exchanger and the indoor heat exchanger and is connected with the first throttle valve in parallel, when the electromagnetic valve is closed, the refrigerant coming out of the indoor heat exchanger flows to the outdoor heat exchanger through the first throttle valve, when the electromagnetic valve is opened, the refrigerant coming out of the indoor heat exchanger flows to the outdoor heat exchanger through the electromagnetic valve, when the air conditioner operates in a heating mode, the refrigerant flows to the indoor heat exchanger through the four-way valve after coming out of the compressor, the refrigerant is condensed in the indoor heat exchanger and then becomes the normal-temperature high-pressure refrigerant, the normal-temperature high-pressure refrigerant flows to the first throttle valve, the first throttle valve throttles the refrigerant and then flows to the outdoor heat exchanger, under the action of the first throttle valve, the refrigerant enters the outdoor heat exchanger and then is evaporated into a low-temperature low-pressure gas state, and after heat, returning to the compressor. Because the liquid temperature coming out of the indoor heat exchanger is higher than the outdoor temperature, when the temperature parameter of the outdoor heat exchanger meets the frosting condition, the electromagnetic valve is controlled to be opened, the high-temperature refrigerant coming out of the indoor heat exchanger enters the outdoor heat exchanger from the branch where the electromagnetic valve is located, the pipe temperature of the indoor heat exchanger is increased, the frost on the outer surface of the outdoor heat exchanger preheats the water, the defrosting is carried out on the surface of the outdoor heat exchanger under the condition that the refrigeration mode is not switched during low-temperature heating, and the defrosting process of the embodiment does not influence the indoor thermal comfort.
It can be understood that, when the solenoid valve is opened for a long time, the high-pressure refrigerant flows from the branch where the solenoid valve is located to the outdoor heat exchanger, and then flows back to the compressor to damage the compressor, therefore, the service life of the compressor is directly influenced by the length of time that the solenoid valve is opened, in this embodiment, after the solenoid valve is opened, the solenoid valve is restored to a closed state after a preset time interval, after the solenoid valve is closed, the temperature parameter of the outdoor heat exchanger still meets the defrosting condition, and then the solenoid valve is opened again, so that the solenoid valve is periodically controlled to be switched between opening and closing, the frosting speed of the outdoor heat exchanger is slowed down, and meanwhile, the indoor thermal comfort is not influenced.
Or, after the electromagnetic valve is opened, the electromagnetic valve is closed after a preset time interval, and if the temperature parameter of the outdoor heat exchanger still meets the frosting condition, other defrosting modes are adopted for defrosting.
In a further embodiment, after the electromagnetic valve is controlled to be opened, whether defrosting is finished or not is judged, and if defrosting is finished, the electromagnetic valve is controlled to be closed, so that a refrigerant in the air conditioner flows to the first throttle valve, and the air conditioner continues to operate in a normal heating mode.
In this embodiment, when the air conditioner operates in the heating mode, if the outdoor heat exchanger of the air conditioner satisfies the frosting condition, the electromagnetic valve connected in parallel with the first throttle valve between the outdoor heat exchanger and the indoor heat exchanger is controlled to be opened, after the electromagnetic valve is opened, the refrigerant directly flows to the outdoor heat exchanger from the electromagnetic valve without throttling action, the refrigerant coming out of the indoor heat exchanger directly enters the outdoor heat exchanger without throttling, the temperature of the outdoor heat exchanger is raised by the refrigerant, the frost on the surface is removed after the temperature of the outdoor heat exchanger rises, the outdoor heat exchanger is defrosted without switching the cooling mode, and the influence of the cooling mode on the indoor thermal comfort can be avoided.
In addition, in this embodiment, the electromagnetic valve is connected in parallel to the first throttle valve, the electromagnetic valve can turn on or close the branch connected in parallel to the first throttle valve, when the outdoor heat exchanger is defrosted, the electromagnetic valve can be directly controlled to be opened to turn on the branch, and a refrigerant coming out of the indoor heat exchanger is directly guided into the outdoor heat exchanger without controlling the first throttle valve.
Referring to fig. 5, the present invention further provides a second embodiment of a control method of an air conditioner, which is based on the first embodiment, and after the step of controlling the electromagnetic valve to be opened to defrost the outdoor heat exchanger, the control method of the air conditioner further includes:
step S40, acquiring the time length of the electromagnetic valve kept in the open state;
and step S50, when the time length reaches the holding time length, executing the step of acquiring the temperature parameter of the outdoor heat exchanger of the air conditioner.
In this embodiment, when the temperature parameter of the outdoor heat exchanger meets the frosting condition, the electromagnetic valve is controlled to be opened to defrost the outdoor heat exchanger, in order to achieve a better defrosting effect, the electromagnetic valve is set to be kept for a period of time after being opened, and then whether the temperature parameter of the defrosted outdoor heat exchanger meets the frosting condition is judged, so that the defrosting is performed more thoroughly.
Setting the holding time of the electromagnetic valve in the opening state, when the temperature parameter of the outdoor heat exchanger meets the defrosting condition, controlling the electromagnetic valve to be opened, recording the time of the electromagnetic valve in the opening state, when the time reaches the holding time, acquiring whether the temperature parameter of the outdoor heat exchanger after defrosting meets the frosting condition, if so, continuing to keep the electromagnetic valve in the opening state, if not, indicating that the defrosting of the outdoor heat exchanger is finished, at the moment, closing the electromagnetic valve to enable the refrigerant to flow to the first throttle valve, and after the first throttle valve is throttled, entering the outdoor heat exchanger to enable the air conditioner to continue to operate normally to heat.
The maintaining time length is determined according to a difference value between the outlet temperature of the outdoor heat exchanger and the initial outlet temperature of the outdoor heat exchanger when the frosting condition is met, the larger the difference value is, the heavier the frosting degree of the outdoor heat exchanger is, in order to slow down defrosting, the longer the maintaining time length is set, namely the larger the difference value is, the longer the maintaining time length is; the smaller the difference value is, the lighter the frosting degree of the outdoor heat exchanger is, and in order to avoid the compressor being damaged due to the overlong opening time of the electromagnetic valve, the shorter the holding time period is correspondingly set.
In a more preferred embodiment, the holding time period is set to at least two levels, for example, when the difference is greater than the first preset value and less than a third preset value, the holding time period is t31, and t31 is 20 s; when the difference is greater than the third preset value, the holding time length is t32, and t32 is 30 s. The third preset value is larger than the first preset value, the ratio of the third preset value to the initial outlet temperature is (0.35-0.45), and optionally, the ratio of the third preset value to the initial outlet temperature is 0.4.
It can be understood that, after the solenoid valve is opened and kept opened for the holding time period, the difference is still greater than the first preset value, and the solenoid valve is kept opened continuously, or other defrosting modes are adopted for defrosting.
This embodiment is through control the solenoid valve is after the open mode keeps for a certain length of time, judges again whether its temperature parameter still satisfies the condition of frosting, if satisfy, continues the defrosting, if unsatisfied then closes the solenoid valve, if the frosting degree of outdoor heat exchanger is little, the solenoid valve keeps opening for a certain length of time, can be so that the surface defrosting of outdoor heat exchanger is more thorough, if the frosting degree of outdoor heat exchanger is big, the solenoid valve keeps opening for a certain length of time, can improve the defrosting effect.
In order to protect the compressor, the holding time of the electromagnetic valve in the opening state is limited, the air conditioner performs defrosting by adopting the defrosting mode of the embodiment, the holding time of the electromagnetic valve in the opening state reaches the safe holding time, and when the outdoor heat exchanger is not completely defrosted, defrosting is performed by adopting other modes, for example, a supercooling pipe is connected in series between the first throttle valve and the indoor heat exchanger, the supercooling pipe is arranged at the air inlet side of the outdoor heat exchanger, and auxiliary defrosting is performed on the outdoor heat exchanger through the supercooling pipe. The refrigerant coming out of the indoor heat exchanger enters the supercooling pipe, the supercooling pipe is arranged on the air inlet side of the outdoor heat exchanger, and the supercooling pipe exchanges heat with air on the air inlet side, so that the temperature of the air entering the outdoor heat exchanger is increased, hot air has a dehumidification effect on the surface of the outdoor heat exchanger, and meanwhile, the high-temperature air is blown to the surface of the outdoor heat exchanger after being heated by the supercooling pipe based on the outdoor environment temperature, so that the high-temperature air is not easy to frost on the surface of the outdoor heat exchanger, and the defrosting effect is further improved.
Or, the operation refrigeration mode of the air conditioner is switched, so that the high-temperature and high-pressure refrigerant at the outlet of the compressor directly flows to the outdoor heat exchanger after entering the four-way valve, and the defrosting effect is further improved by the high-temperature and high-pressure refrigerant.
Specifically, referring to fig. 6, the present invention further provides a third embodiment of a control method of an air conditioner, based on all the embodiments described above, in this embodiment, a subcooling pipe is connected in series between the first throttle valve of the air conditioner and the indoor heat exchanger, the subcooling pipe is disposed on an air intake side of the outdoor heat exchanger, a branch is connected in parallel to the subcooling pipe, a second throttle valve is disposed on the branch, in a heating mode, the second throttle valve is in a fully open state, and the step of controlling the electromagnetic valve to open to defrost the outdoor heat exchanger is executed while the step of:
step S60, controlling the second throttle valve to close.
The second throttling valve is arranged on a branch path where the supercooling pipes are connected in parallel, and when the second throttling valve is opened, the refrigerant coming out of the indoor heat exchanger directly flows to the first throttling valve through the second throttling valve and then flows to the outdoor heat exchanger. When the air conditioner heats normally, the refrigerant does not flow through the supercooling pipe, the electromagnetic valve is controlled to be opened in the defrosting process, the second throttle valve is controlled to be closed, so that the refrigerant firstly flows to the electromagnetic valve after passing through the supercooling pipe, the refrigerant releases heat after being condensed in the supercooling pipe, the temperature of air blown to the outdoor heat exchanger is increased, the temperature of air blown to the outdoor heat exchanger is high, the outdoor heat exchanger can be defrosted further, and meanwhile, when high-temperature air is blown to the outdoor heat exchanger, frosting is not easy to occur.
In addition, when the air conditioner heats normally, the second throttle valve can be controlled to be closed, the refrigerant coming out of the indoor heat exchanger is further cooled by the supercooling pipe and then flows to the first throttle valve for throttling, so that the temperature of the refrigerant entering the outdoor heat exchanger is lower, the enthalpy difference value between the inlet temperature and the outlet temperature of the outdoor heat exchanger is increased, and the heating performance of the system is improved.
In this embodiment, a branch is connected in parallel to the supercooling pipe, and a second throttle valve is arranged on the branch, so that when the supercooling pipe is required to assist in defrosting, the second throttle valve is controlled to be closed, the refrigerant flows to the electromagnetic valve after passing through the supercooling pipe, and the supercooling pipe heats air blowing to the outdoor heat exchanger, thereby defrosting the outdoor heat exchanger.
Specifically, referring to fig. 7, the present invention further provides a fourth embodiment of a control method of an air conditioner, and based on all the embodiments, after the step of controlling the electromagnetic valve to be opened to defrost the outdoor heat exchanger, the method further includes:
step S70, after the electromagnetic valve is opened for a preset time, acquiring the difference value between the outlet temperature of the outdoor heat exchanger and the initial outlet temperature of the outdoor heat exchanger;
and step S80, switching a four-way valve of the air conditioner when the outlet temperature is less than a third preset temperature and the difference value is greater than a second preset value.
The preset duration may be a safe holding duration or a holding duration set by a user. After the electromagnetic valve is opened for a preset time, acquiring the difference value between the outlet temperature of the outdoor heat exchanger and the initial outlet temperature of the outdoor heat exchanger; and if the outlet temperature is lower than a third preset temperature and the difference value is larger than a second preset value, switching a four-way valve of the air conditioner to enable the air conditioner to operate in a refrigeration mode, and defrosting the outdoor heat exchanger through a high-temperature and high-pressure refrigerant of the compressor when the air conditioner operates in the refrigeration mode.
When the four-way valve of the air conditioner is switched, and the heating mode is switched to the cooling mode, the electromagnetic valve is in an open state and then is in a closed state, and the system cooling is not influenced, so that the electromagnetic valve can be controlled to keep a current state or be closed; when the electromagnetic valve is a two-way valve, the four-way valve of the air conditioner is switched, and the electromagnetic valve is closed, so that the refrigerant flows to the indoor heat exchanger through the first throttling valve after coming out of the outdoor heat exchanger, and the refrigeration cycle is realized.
The second preset value is greater than or equal to the first preset value, that is, after the electromagnetic valve is opened to defrost, the difference between the outlet temperature of the outdoor heat exchanger and the initial outlet temperature is still larger or larger, it is determined that the defrosting effect of the current defrosting mode is not good, and at this time, the outdoor heat exchanger needs to be switched to the refrigeration mode to initialize.
Specifically, the compressor and the outdoor heat exchanger are communicated by switching a flow path in the four-way valve, a high-temperature and high-pressure refrigerant in the compressor directly flows to the outdoor heat exchanger, and meanwhile, the first throttle valve is restored to the opening degree before dehumidification, so that the normal refrigeration operation of the air conditioner is realized.
This embodiment is through switching to the mode of refrigerating and coming the defrosting to outdoor heat exchanger, further promotes the defrosting effect.
Furthermore, in an embodiment, the present invention also provides a storage medium having a control program stored thereon, the control program, when executed by a processor, implementing the following operations:
the method comprises the steps that when the air conditioner runs in a heating mode, temperature parameters of an outdoor heat exchanger of the air conditioner are obtained;
when the temperature parameter meets the frosting condition, controlling the electromagnetic valve to be opened so as to defrost the outdoor heat exchanger;
and controlling the electromagnetic valve to be closed when the defrosting is finished.
Further, the control program when executed by the processor further performs the following:
acquiring the time length of the electromagnetic valve kept in an open state;
and when the time length reaches the holding time length, executing the step of acquiring the temperature parameter of the outdoor heat exchanger of the air conditioner.
Further, the control program when executed by the processor further performs the following:
and controlling the electromagnetic valve to be opened so as to defrost the outdoor heat exchanger and simultaneously controlling the second throttle valve to be closed.
Further, the control program when executed by the processor further performs the following:
after the electromagnetic valve is opened for a preset time, acquiring the difference value between the outlet temperature of the outdoor heat exchanger and the initial outlet temperature of the outdoor heat exchanger;
and when the outlet temperature is lower than a third preset temperature and the difference value is higher than a second preset value, switching the four-way valve and closing the electromagnetic valve.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A control method of an air conditioner is characterized in that a first throttle valve and an electromagnetic valve are connected between an indoor heat exchanger and an outdoor heat exchanger of the air conditioner, the first throttle valve is connected with the electromagnetic valve in parallel, and the control method of the air conditioner comprises the following steps:
the method comprises the steps that when the air conditioner runs in a heating mode, temperature parameters of an outdoor heat exchanger of the air conditioner are obtained;
when the temperature parameter meets the frosting condition, controlling the electromagnetic valve to be opened so as to defrost the outdoor heat exchanger;
and controlling the electromagnetic valve to be closed when the defrosting is finished.
2. The control method of an air conditioner according to claim 1, wherein the satisfying of the frosting condition includes at least one of:
the outdoor temperature is lower than a first preset temperature;
the difference value between the current outlet temperature of the outdoor heat exchanger and the initial outlet temperature of the outdoor heat exchanger is larger than a first preset value;
and the surface temperature of the outdoor heat exchanger is lower than a second preset temperature.
3. The control method of an air conditioner according to claim 1, wherein after the step of controlling the solenoid valve to be opened to defrost the outdoor heat exchanger, the control method of an air conditioner further comprises:
acquiring the time length of the electromagnetic valve kept in an open state;
and when the time length reaches the holding time length, executing the step of acquiring the temperature parameter of the outdoor heat exchanger of the air conditioner.
4. The control method of an air conditioner according to claim 3, wherein the holding time period is determined according to a difference between an outlet temperature of the outdoor heat exchanger and an initial outlet temperature of the outdoor heat exchanger when the frosting condition is satisfied, and the longer the difference is, the longer the holding time period is.
5. The control method of an air conditioner according to claim 1, wherein a supercooling pipe is connected in series between the first throttle valve and the indoor heat exchanger, the supercooling pipe is disposed at an air inlet side of the outdoor heat exchanger, a branch is connected in parallel to the supercooling pipe, a second throttle valve is disposed on the branch, and the second throttle valve is in a fully opened state in a heating mode; and when the step of controlling the electromagnetic valve to be opened so as to defrost the outdoor heat exchanger is executed, the following steps are also executed:
controlling the second throttle valve to close.
6. The control method of an air conditioner according to claim 1, wherein after the step of controlling the solenoid valve to be opened to defrost the outdoor heat exchanger, further comprising:
after the electromagnetic valve is opened for a preset time, acquiring the difference value between the outlet temperature of the outdoor heat exchanger and the initial outlet temperature of the outdoor heat exchanger;
and switching the four-way valve of the air conditioner when the outlet temperature is lower than a third preset temperature and the difference value is higher than a second preset value.
7. The air conditioner is characterized by comprising a compressor, a four-way valve, an indoor heat exchanger, a first throttling valve and an outdoor heat exchanger, wherein the compressor, the four-way valve, the indoor heat exchanger, the first throttling valve and the outdoor heat exchanger are sequentially connected to form a refrigerant circulating flow path; the first throttle valve is connected with a solenoid valve in parallel, the air conditioner further comprises a memory, a processor and a control program stored on the memory and capable of running on the processor, the processor is in signal connection with the first throttle valve, the second throttle valve, the four-way valve and the compressor, and the control program when executed by the processor realizes the steps of the control method of the air conditioner according to any one of claims 1 to 6.
8. The air conditioner as claimed in claim 7, further comprising a supercooling pipe provided at an air intake side of the outdoor heat exchanger, the supercooling pipe being connected between the indoor heat exchanger and the first throttle valve.
9. The air conditioner as claimed in claim 8, wherein a branch connected in parallel with the supercooling pipe is provided between the indoor heat exchanger and the first throttle valve, and a second throttle valve is provided on the branch and is in signal connection with the processor.
10. A storage medium characterized in that the storage medium has stored thereon a control program which, when executed by a processor, implements the steps of the control method of an air conditioner according to any one of claims 1 to 6.
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Application publication date: 20210528 |