CN109974202B - Control method and device for slowing down frosting and air conditioner - Google Patents
Control method and device for slowing down frosting and air conditioner Download PDFInfo
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- CN109974202B CN109974202B CN201910266338.4A CN201910266338A CN109974202B CN 109974202 B CN109974202 B CN 109974202B CN 201910266338 A CN201910266338 A CN 201910266338A CN 109974202 B CN109974202 B CN 109974202B
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- air conditioner
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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
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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
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
Abstract
The invention provides a control method and device for slowing down frosting and an air conditioner, and relates to the technical field of air conditioners. The air conditioner comprises an air conditioner outdoor unit, a connecting pipe is arranged between the exhaust pipe of the air conditioner outdoor unit and an inlet pipe of an outdoor unit heat exchanger, the exhaust pipe is communicated with the inlet pipe through the connecting pipe, a valve is arranged on the connecting pipe, when a starting instruction is received and the starting instruction indicates that the air conditioner operates in a heating mode, the collection temperature of the preset collection point in the indoor unit air outlet temperature and the outdoor unit heat exchanger is obtained, when the indoor unit air outlet temperature is higher than a first preset value continuously for a first time and the collection temperature is not higher than a second preset value continuously for the first time, the valve is controlled to be opened, and a refrigerant in the exhaust pipe is. Therefore, a high-temperature and high-pressure refrigerant in front of the valve can be introduced into the heat exchanger of the outdoor unit to improve the temperature of the refrigerant in the heat exchanger of the outdoor unit, so that the frosting speed of an outdoor unit of the air conditioner is reduced, the heating effect of the air conditioner is improved, and the comfort of the air conditioner during low-temperature heating is improved.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method and device for slowing down frosting and an air conditioner.
Background
With the development of society, the living standard of people is continuously improved, the pursuit living quality is higher and higher, and the use of air conditioners is more and more common. At present, the air conditioner can have the problem that the heating effect is relatively poor when heating, on one hand because the frosting of the outer machine of the air conditioner can influence the heating effect when heating, on the other hand because the outer machine of the air conditioner needs to be defrosted after frosting, and need to shut down when defrosting, lead to the condition that the air conditioner can appear discontinuous shut down when heating to the heating effect of air conditioner has also been influenced.
Disclosure of Invention
The invention solves the problems that the air conditioner has poor heating effect and influences user experience when in heating operation.
In order to solve the above problems, the present invention provides a control method for reducing frosting, which is applied to an air conditioner, the air conditioner comprises an air conditioner external unit, a connection pipe is arranged between an exhaust pipe of the air conditioner external unit and an inlet pipe of an outdoor unit heat exchanger, the exhaust pipe is communicated with the inlet pipe through the connection pipe, a valve is arranged on the connection pipe, and the method comprises:
when a starting-up instruction is received and the starting-up instruction indicates that the air conditioner operates in a heating mode, acquiring the air outlet temperature of an internal machine and the acquisition temperature of a preset acquisition point in the heat exchanger of the outdoor machine;
when the air outlet temperature of the inner unit is higher than a first preset value continuously for a first time and the collection temperature is not higher than a second preset value continuously for the first time, the valve is controlled to be opened so as to introduce the refrigerant in the exhaust pipe into the heat exchanger of the outdoor unit through the connecting pipe and the inlet pipe.
In the control method for reducing frosting provided by the invention, when the air conditioner operates in a heating mode, whether the valve is opened or not is judged by judging the air outlet temperature of the inner machine and the collection temperature of a preset collection point in the heat exchanger of the outdoor machine, when the air outlet temperature of the inner machine and the collection temperature meet the condition that the air outlet temperature of the inner machine is continuously higher than a first preset value for the first time and the collection temperature is continuously not higher than a second preset value for the first time, the frosting of the air conditioner is easy to occur under the condition, so that the valve is controlled to be opened, high-temperature and high-pressure refrigerant in front of the valve is introduced into the heat exchanger of the outdoor machine to improve the temperature of the refrigerant in the heat exchanger of the outdoor machine, the frosting speed of the air conditioner is reduced, the heating effect of the air conditioner is effectively improved, the defrosting period of the air conditioner is prolonged by reducing the frosting speed, the shutdown times of the air, the comfort of the air conditioner during low-temperature heating is improved.
Further, after the step of controlling the valve to open when the outlet air temperature of the internal machine is higher than a first preset value for a first time and the collected temperature is not higher than a second preset value for the first time, the method further includes:
after the valve is opened, if the air outlet temperature of the internal machine is higher than the first preset value for a second time and the collected temperature is higher than the second preset value for the second time, controlling the valve to keep the current opening.
Further, after the step of controlling the valve to open when the outlet air temperature of the internal machine is higher than a first preset value for a first time and the collected temperature is not higher than a second preset value for the first time, the method further includes:
and after the valve is opened, if the air outlet temperature of the internal machine lasts for a third time and is not higher than the first preset value, controlling the valve to keep the current opening.
Further, after the step of obtaining the air outlet temperature of the indoor unit and the collection temperature of the preset collection point in the heat exchanger of the outdoor unit when the starting-up instruction is received and the starting-up instruction indicates that the air conditioner operates in the heating mode, the method further comprises:
and when the air outlet temperature of the inner machine is higher than the first preset value and the collection temperature is higher than the second preset value, controlling the valve to close.
In the invention, when the air outlet temperature of the indoor unit is higher than a first preset value and the collection temperature of a preset collection point in the heat exchanger of the outdoor unit is higher than a second preset value, the heating effect of the air conditioner is better under the condition, and the outdoor unit of the air conditioner basically does not frost, so that a valve does not need to be opened.
Further, after the step of obtaining the air outlet temperature of the indoor unit and the collection temperature of the preset collection point in the heat exchanger of the outdoor unit when the starting-up instruction is received and the starting-up instruction indicates that the air conditioner operates in the heating mode, the method further comprises:
and when the air outlet temperature of the inner machine is not higher than the first preset value, controlling the valve to close.
Further, the method further comprises:
when the starting instruction indicates that the air conditioner operates in an automatic mode, acquiring indoor environment temperature;
and determining an operation mode of the air conditioner according to the indoor environment temperature and controlling the opening and closing state of the valve member, wherein the operation mode comprises a ventilation mode, a cooling mode and a heating mode.
In the invention, when the starting instruction indicates to operate in the automatic mode, the proper operation mode of the air conditioner and the opening and closing state of the control valve can be determined by judging the indoor environment temperature.
Further, the step of determining the operation mode of the air conditioner and controlling the open/close state of the valve member according to the indoor ambient temperature includes:
when the indoor environment temperature is higher than a third preset value and lower than a fourth preset value, determining that the air conditioner operates in the ventilation mode, and controlling the valve to be closed;
when the indoor environment temperature is not lower than the fourth preset value, determining that the air conditioner operates in the cooling mode, and controlling the valve to be closed;
and when the indoor environment temperature is not higher than the third preset value, determining that the air conditioner operates in the heating mode.
In the invention, when the indoor environment temperature is higher than a third preset value and lower than a fourth preset value, the air conditioner is determined to operate in a ventilation mode and the valve is controlled to be closed, when the indoor environment temperature is not lower than the fourth preset value, the air conditioner is determined to operate in a cooling mode and the valve is controlled to be closed, when the indoor environment temperature is not higher than the third preset value, the air conditioner is determined to operate in a heating mode, and at the moment, the valve is controlled to be opened or closed according to a control mode when the air conditioner operates in the heating mode.
Further, the method further comprises:
and when the starting-up instruction indicates that the air conditioner operates in a ventilation mode, a dehumidification mode or a refrigeration mode, controlling the valve to be closed.
The invention also provides a control device for slowing down frosting, which is applied to an air conditioner, the air conditioner comprises an air conditioner external unit, a connecting pipe is arranged between an exhaust pipe of the air conditioner external unit and an inlet pipe of an outdoor unit heat exchanger, the exhaust pipe is communicated with the inlet pipe through the connecting pipe, a valve is arranged on the connecting pipe, and the device comprises:
the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring the air outlet temperature of an internal machine and the acquisition temperature of a preset acquisition point in a heat exchanger of the external machine when a starting-up instruction is received and the starting-up instruction indicates that the air conditioner operates in a heating mode;
and the control module is used for controlling the valve to be opened when the air outlet temperature of the inner machine is higher than a first preset value for a first time and the collected temperature is not higher than a second preset value for the first time, so that the refrigerant in the exhaust pipe is introduced into the heat exchanger of the outdoor machine through the connecting pipe and the inlet pipe.
The invention also provides an air conditioner, which comprises a controller and an air conditioner outdoor unit, wherein a connecting pipe is arranged between an exhaust pipe of the air conditioner outdoor unit and an inlet pipe of an outdoor unit heat exchanger, the exhaust pipe is communicated with the inlet pipe through the connecting pipe, a valve is arranged on the connecting pipe, and the controller executes the control method for slowing down frosting by running a computer program.
Drawings
Fig. 1 is a schematic diagram of the components of an air conditioner provided by the present invention.
FIG. 2 is a flow chart of a control method for reducing frosting according to the present invention.
FIG. 3 is a schematic flow chart of another control method for reducing frosting provided by the present invention.
FIG. 4 is a functional block diagram of a control device for reducing frost formation according to the present invention.
Description of reference numerals: 100-an air conditioner; 400-a control device to slow down frosting; 110-an air conditioner outdoor unit; 120-air conditioner indoor unit; 111-a compressor; 112-a four-way valve; 113-exhaust pipe; 114-outdoor unit heat exchanger; 115-inlet pipe; 116-a connecting tube; 117-a valve member; 121-indoor heat exchanger; 410-an instruction receiving module; 420-an acquisition module; 430-control module.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Fig. 1 is a schematic diagram of an air conditioner 100 according to an embodiment of the present invention. The air conditioner 100 includes an outdoor unit 110 and an indoor unit 120, in the outdoor unit 110, a pipe between a compressor 111 and a four-way valve 112 is an exhaust pipe 113 of the outdoor unit 110, a connection pipe 116 is disposed between the exhaust pipe 113 and an inlet pipe 115 of an outdoor unit heat exchanger 114, the exhaust pipe 113 is communicated with the inlet pipe 115 through the connection pipe 116, and a valve 117 is disposed on the connection pipe 116.
In this embodiment, the valve 117 may be an electronic expansion valve, but is not limited thereto. A first temperature sensor is installed at an air outlet of the indoor unit 120 of the air conditioner, a second temperature sensor is installed on an elbow of the outdoor unit heat exchanger 114, the first temperature sensor is used for detecting the air outlet temperature of the indoor unit 120 of the air conditioner, and the second temperature sensor is used for detecting the temperature of the middle part of the outdoor unit heat exchanger 114.
In this embodiment, the air conditioner 100 may further include a controller (not shown in fig. 1), which may be located in the air conditioner external unit 110 or the air conditioner internal unit 120, and the controller stores program instructions/modules corresponding to the control method and apparatus for reducing frosting provided by the embodiment of the present invention, and executes the computer programs and modules, thereby executing various functional applications and data processing.
For example, when the air conditioner 100 is in heating operation, the controller may obtain the air outlet temperature of the indoor unit 120 and the temperature of the middle portion of the outdoor unit heat exchanger 114 from the first temperature sensor and the second temperature sensor, and determine whether the air conditioner 100 is prone to frost according to the temperature of the middle portion of the outdoor unit heat exchanger 114 and the air outlet temperature of the indoor unit 120, when a condition of being prone to frost is met, by opening the valve 117, a part of high-temperature and high-pressure refrigerant discharged from the compressor 111 may enter the indoor unit heat exchanger 121 through the exhaust pipe 113 and the four-way valve 112 to release heat and condense, and another part of the high-temperature and high-pressure refrigerant may enter the outdoor unit heat exchanger 114 through the exhaust pipe 113, the connection pipe 116, and the inlet pipe 115, so as to increase the pressure of the refrigerant entering the outdoor unit heat.
Fig. 2 is a flowchart illustrating a control method for reducing frosting according to an embodiment of the present invention. It should be noted that the control method for reducing frosting according to the present invention is not limited by the specific sequence shown in fig. 2 and described below. It should be understood that in other embodiments, the order of some steps in the control method for reducing frost formation according to the present invention may be interchanged according to actual needs, or some steps may be omitted or deleted. The control method for reducing frost formation can be applied to the above controller, and the specific flow shown in fig. 2 will be described in detail below.
Step S101, receiving a starting-up instruction.
In this embodiment, after the air conditioner 100 receives the power-on command, the mode of the air conditioner 100 that needs to be operated after being powered on can be determined according to the power-on command. For example, a heating mode, a cooling mode, a ventilation mode, a dehumidification mode, an automatic mode, etc. The steps S102 to S107 are executed when the start-up instruction instructs the air conditioner 100 to operate in the heating mode, the step S110 is executed when the start-up instruction instructs the air conditioner 100 to operate in the ventilation mode, the dehumidification mode or the cooling mode, and the steps S108 to S109 are executed when the start-up instruction instructs the air conditioner 100 to operate in the automatic mode.
Step S102, when a starting-up instruction is received and the starting-up instruction indicates that the air conditioner operates in a heating mode, acquiring the air outlet temperature of the indoor unit and the acquisition temperature of a preset acquisition point in the heat exchanger of the outdoor unit.
The indoor unit outlet air temperature can be obtained from a first temperature sensor installed at the air outlet of the indoor unit 120 of the air conditioner, and the collected temperature can be obtained from a second temperature sensor installed on the elbow of the outdoor unit heat exchanger 114, that is, the collected temperature of the preset collection point in the outdoor unit heat exchanger 114 in this embodiment is the temperature of the middle portion of the outdoor unit heat exchanger 114.
It can be understood that, after the air conditioner 100 is turned on, the indoor unit outlet air temperature and the temperature of the middle portion of the outdoor unit heat exchanger 114 only need to be obtained through the first temperature sensor and the second temperature sensor in the heating mode.
And step S103, when the air outlet temperature of the inner machine is higher than a first preset value for the first time and the collected temperature is not higher than a second preset value for the first time, controlling a valve to be opened so as to introduce the refrigerant in the exhaust pipe into the heat exchanger of the outdoor machine through the connecting pipe and the inlet pipe.
In this embodiment, when the valve element 117 is controlled to open, a gradual opening manner may be adopted. For example, when the valve element 117 is an electronic expansion valve, the valve element 117 may be gradually opened at a speed of 5 steps/second.
The preferred interval of the first preset value is 28-32 ℃, and the user can keep outputting heat to the room in the interval; the preferable range of the second preset value is-1 ℃ to-4 ℃, and the frost layer in the air conditioner outdoor unit 110 is not obvious in the range, so that the accelerated formation of the frost layer can be relieved; the first time is preferably 2min to 4min, but if the time is not long enough, the frost layer thickness is not formed as fast, and if the time is too short, the fluctuation may be affected.
Thus, when the air outlet temperature and the collection temperature of the inner machine meet the condition that the air outlet temperature of the inner machine is higher than a first preset value for the first time and the collection temperature is not higher than a second preset value for the first time, indicating that the outdoor unit 110 is easily frosted under this condition, the control valve 117 is gradually opened, the high-temperature and high-pressure refrigerant before the valve 117 is introduced into the outdoor heat exchanger 114 by the pressure difference between the front and rear sides of the valve 117 and the suction generated by the rotation of the compressor 111, so as to increase the temperature of the refrigerant in the outdoor heat exchanger 114, thereby slowing down the frosting speed of the outdoor unit 110 of the air conditioner, effectively improving the heating effect of the air conditioner 100, and prolonging the defrosting period of the air conditioner 100 by slowing down the frosting speed, the shutdown frequency of the air conditioner 100 during heating operation is reduced to a certain extent, so that the heating effect of the air conditioner 100 is further improved, and the comfort of the air conditioner 100 during low-temperature heating is improved.
Optionally, after the valve element 117 is gradually opened, the method may further include:
and step S104, after the valve is opened, if the air outlet temperature of the internal machine is higher than the first preset value for the second time and the collected temperature is higher than the second preset value for the second time, controlling the valve to keep the current opening.
In this embodiment, the preferred interval of the second time is 2s to 4s, and if the second time is too long, the outlet air temperature of the internal machine will decrease, and if the second time is too short, it cannot ensure that the frosting is fast. When the indoor unit outlet air temperature is higher than the first preset value for the second time and the collected temperature is higher than the second preset value for the second time, the valve 117 is stopped to be opened continuously, the valve 117 keeps the current opening degree, and the high-temperature and high-pressure refrigerant is introduced into the outdoor unit heat exchanger 114, so that the pressure of the refrigerant entering the outdoor unit heat exchanger 114 is increased, and the frosting possibility in the outdoor unit heat exchanger 114 is reduced.
And step S105, after the valve is opened, if the air outlet temperature of the internal machine is not higher than the first preset value for the third time, controlling the valve to keep the current opening.
In this embodiment, the preferred interval of the third time is 25s to 35s, and too long third time may cause the air outlet temperature of the internal machine to be low, which affects comfort. When the indoor unit outlet air temperature continues for the third time and is not higher than the first preset value, the valve 117 is stopped to be opened continuously, the current opening degree of the valve 117 is kept, and the high-temperature and high-pressure refrigerant is introduced into the outdoor unit heat exchanger 114, so that the pressure of the refrigerant entering the outdoor unit heat exchanger 114 is increased, and the frosting possibility in the outdoor unit heat exchanger 114 is reduced.
Optionally, after step S102, the method may further include:
and S106, controlling the valve to close when the air outlet temperature of the internal machine is higher than a first preset value and the collected temperature is higher than a second preset value.
In this embodiment, when the indoor unit outlet air temperature is higher than the first preset value and the collection temperature of the preset collection point in the outdoor unit heat exchanger 114 is higher than the second preset value, it indicates that the heating effect of the air conditioner 100 is better under this condition, and the outdoor unit 110 of the air conditioner will not frost, so the valve 117 on the connection pipe 116 does not need to be opened.
Optionally, after step S102, the method may further include:
and step S107, when the air outlet temperature of the internal machine is not higher than the first preset value, controlling the valve to close.
In this embodiment, after the air conditioner 100 starts the heating mode, when the indoor unit outlet air temperature is determined not to be higher than the first preset value, it indicates that the outdoor unit 110 will not frost substantially under this condition, so it is not necessary to open the valve 117 on the connecting pipe 116.
Optionally, in this embodiment, the method may further include:
step S108, when the starting-up instruction indicates that the air conditioner operates in the automatic mode, the indoor environment temperature is obtained.
The indoor environment temperature can be detected by a pre-installed indoor environment temperature sensor in step S109, and the operation mode of the air conditioner and the open/close state of the control valve are determined according to the indoor environment temperature, wherein the operation mode includes a ventilation mode, a cooling mode and a heating mode.
In the present embodiment, when the power-on command indicates that the air conditioner 100 operates in the automatic mode, it is necessary to determine whether the air conditioner 100 specifically operates in the ventilation mode, the cooling mode or the heating mode, and to control the open/close state of the valve 117 according to the acquired indoor ambient temperature.
Specifically, this step S109 includes: when the indoor environment temperature is higher than a third preset value and lower than a fourth preset value, determining that the air conditioner operates in a ventilation mode, and controlling a valve to close; when the indoor environment temperature is not lower than a fourth preset value, determining that the air conditioner operates in a refrigeration mode, and controlling a valve to close; and when the indoor environment temperature is not higher than the third preset value, determining that the air conditioner operates in a heating mode.
When it is determined that the air conditioner 100 is operating in the heating mode, the valve element 117 is controlled to open or close in accordance with the control manner shown in the above steps S102 to S107.
Optionally, in this embodiment, the method may further include:
in step S110, when the start-up command indicates that the air conditioner operates in the ventilation mode, the dehumidification mode, or the cooling mode, the valve is controlled to close.
That is, after the air conditioner 100 receives the power-on command, it needs to operate normally according to the mode indicated by the power-on command, and if it is not in the heating mode, the valve 117 on the connection pipe 116 needs to be kept closed.
Next, an example is given to specifically explain the above-described step S101 to step S110. Referring to fig. 3, it is assumed that the first preset value T1 is 30 ℃, the second preset value T2 is-3 ℃, the third preset value T3 is 20 ℃, the fourth preset value T4 is 27 ℃, the first time a is 3min, the second time b is 3s, and the third time c is 30 s. After the air conditioner 100 receives the power-on command, it determines the mode of the air conditioner 100 that needs to be operated after the air conditioner is powered on according to the power-on command (i.e., step S21); when it is determined that the mode requiring operation is the ventilation mode, the air conditioner 100 operates in the normal ventilation mode, and controls the valve 117 to keep the closed state, without acquiring the indoor unit outlet air temperature T1 and the collection temperature T2 of the preset collection point in the outdoor unit heat exchanger 114 (i.e., step S22); when it is determined that the mode requiring operation is the dehumidification mode, the air conditioner 100 operates in the normal dehumidification mode, and controls the valve 117 to keep the closed state, without acquiring the indoor unit outlet air temperature T1 and the acquisition temperature T2 of the preset acquisition point in the outdoor unit heat exchanger 114 (i.e., step S23); when it is determined that the mode requiring operation is the cooling mode, the air conditioner 100 operates in the normal cooling mode, and controls the valve 117 to keep the closed state, without acquiring the indoor unit outlet air temperature T1 and the collection temperature T2 of the preset collection point in the outdoor unit heat exchanger 114 (i.e., step S24); when the mode needing to be operated is determined to be the heating mode, the air conditioner 100 may continuously detect the indoor unit outlet air temperature T1 and the collected temperature T2 after operating for 10 minutes, determine the relationship between T1 and T1, and between T2 and T2 (i.e., step S25), and control the valve element 117 to maintain the closed state when T1> T1 and T2> T2 (i.e., step S26); when T1 is less than or equal to T1, the valve element 117 is controlled to maintain the closed state (i.e., step S27); when T1> T1 and T2 ≦ T2 continues for a ═ 3min, the valve element 117 is gradually opened at a speed of 5 steps/second (i.e., step S28), after the valve element 117 is opened, if T1> T1 and T2> T2 continue for b ═ 3S, the current opening degree of the valve element 117 is kept unchanged (i.e., step S29), and after the valve element 117 is opened, if T1 ≦ T1 continues for c ≦ 30S, the current opening degree of the valve element 117 is kept unchanged (i.e., step S30); when the mode requiring operation is determined to be the automatic mode, the current indoor ambient temperature TA needs to be detected, and whether the air conditioner 100 specifically operates the cooling, heating or ventilation mode is determined by the indoor ambient temperature TA (i.e., step S31), wherein when the indoor ambient temperature TA satisfies T3< TA < T4, the control is performed according to step S22 (i.e., step S32), when the indoor ambient temperature TA satisfies TA ≧ T4, the control is performed according to step S24 (i.e., step S33), and when the indoor ambient temperature TA satisfies TA ≦ T3, the control is performed according to steps S25 to S30 (i.e., step S34).
It should be noted that, in this embodiment, when the air conditioner 100 receives another instruction, taking a shutdown instruction as an example, the on-off condition of the valve 117 may be detected first after waiting for a certain time (for example, 3s), if the valve 117 is in the open state, the valve 117 is closed first, and then a shutdown action is performed, and if the valve 117 is in the closed state, the shutdown action is directly performed; further, taking the mode switching command as an example, if the mode switching command is received during the heating operation of the air conditioner 100, the valve 117 is closed.
Fig. 4 is a functional block diagram of a control apparatus 400 for reducing frosting according to an embodiment of the present invention. It should be noted that the basic principle and the technical effects of the control device 400 for reducing frosting according to the embodiment of the present invention are the same as those of the foregoing method embodiment, and for a brief description, reference may be made to the corresponding contents of the foregoing method embodiment for the parts not mentioned in the present embodiment. The control device 400 for reducing frost formation can be applied to the above controller, and includes a command receiving module 410, an obtaining module 420 and a control module 430.
It is understood that the instruction receiving module 410, the obtaining module 420 and the control module 430 are software functional modules and computer programs that can be executed by the controller.
The command receiving module 410 is used for receiving a power-on command.
It is understood that the instruction receiving module 410 can execute the above step S101.
The obtaining module 420 is configured to obtain an air outlet temperature of the indoor unit and a collecting temperature of a preset collecting point in the heat exchanger of the outdoor unit when the starting instruction is received and the starting instruction instructs the air conditioner to operate in the heating mode.
It is understood that the obtaining module 420 may perform the step S102.
The control module 430 is configured to control the valve to open when the outlet air temperature of the internal unit is higher than a first preset value for the first time and the collected temperature is not higher than a second preset value for the first time, so as to introduce the refrigerant in the exhaust pipe into the heat exchanger of the outdoor unit through the connecting pipe and the inlet pipe.
Optionally, the control module 430 is further configured to, after the valve is opened, if the indoor unit outlet air temperature continues for a second time higher than the first preset value and the collected temperature continues for a second time higher than the second preset value, control the valve to keep the current opening degree; and after the valve is opened, if the air outlet temperature of the internal machine is not higher than the first preset value for the third time, controlling the valve to keep the current opening.
Optionally, the control module 430 is further configured to control the valve to close when the outlet air temperature of the internal machine is higher than a first preset value and the collected temperature is higher than a second preset value; and when the air outlet temperature of the inner machine is not higher than the first preset value, controlling the valve to close.
Optionally, the control module 430 is further configured to control the valve element to close when the start-up command indicates that the air conditioner is operating in the ventilation mode, the dehumidification mode or the cooling mode.
It is understood that the control module 430 can perform the steps S103, S104, S105, S106, S107 and S110.
Optionally, the obtaining module 420 is further configured to obtain the indoor ambient temperature when the power-on instruction indicates that the air conditioner is operating in the automatic mode.
It is understood that the obtaining module 420 may also perform the step S108.
Optionally, the control module 430 is further configured to determine an operation mode of the air conditioner according to the indoor ambient temperature and control the open/close state of the valve element, wherein the operation mode includes a ventilation mode, a cooling mode and a heating mode.
Specifically, the control module 430 is configured to determine that the air conditioner is operating in the ventilation mode and control the valve to close when the indoor ambient temperature is higher than the third preset value and lower than the fourth preset value; when the indoor environment temperature is not lower than a fourth preset value, determining that the air conditioner operates in a refrigeration mode, and controlling a valve to close; and when the indoor environment temperature is not higher than the third preset value, determining that the air conditioner operates in a heating mode.
It is understood that the control module 430 may also perform the step S109.
In summary, in the control method and device for reducing frosting and the air conditioner provided by the present invention, the air conditioner includes an air conditioner external unit, a connection pipe is provided between an exhaust pipe of the air conditioner external unit and an inlet pipe of an outdoor unit heat exchanger, the exhaust pipe is communicated with the inlet pipe through the connection pipe, a valve is provided on the connection pipe, when a power-on instruction is received and the power-on instruction indicates that the air conditioner operates in a heating mode, an indoor unit air-out temperature and a collection temperature of a preset collection point in the outdoor unit heat exchanger are obtained, and when the indoor unit air-out temperature is continuously higher than a first preset value for a first time and the collection temperature is continuously not higher than a second preset value for the first time, the valve is controlled to open, so that a refrigerant in the exhaust pipe is introduced into the outdoor unit heat exchanger through the connection pipe. Therefore, a high-temperature and high-pressure refrigerant in front of the valve piece can be introduced into the outdoor unit heat exchanger to improve the refrigerant temperature in the outdoor unit heat exchanger, so that the frosting speed of an outdoor unit of the air conditioner is reduced, the heating effect of the air conditioner is effectively improved, the frosting period of the air conditioner is prolonged by reducing the frosting speed, the shutdown times of the air conditioner during heating operation are reduced to a certain extent, the heating effect of the air conditioner is further improved, and the comfort of the air conditioner during low-temperature heating is improved.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. A control method for slowing down frosting is applied to an air conditioner (100), the air conditioner (100) comprises an air conditioner outdoor unit (110), a connecting pipe (116) is arranged between an exhaust pipe (113) of the air conditioner outdoor unit (110) and an inlet pipe (115) of an outdoor unit heat exchanger (114), the exhaust pipe (113) is communicated with the inlet pipe (115) through the connecting pipe (116), a valve element (117) is arranged on the connecting pipe (116), and the valve element (117) is an electronic expansion valve, the method comprises the following steps:
when a starting-up instruction is received and the starting-up instruction indicates that the air conditioner (100) operates in a heating mode, acquiring the air outlet temperature of an internal machine and the acquisition temperature of a preset acquisition point in the heat exchanger (114) of the outdoor machine;
when the indoor unit outlet air temperature is higher than a first preset value continuously for a first time and the collected temperature is not higher than a second preset value continuously for the first time, controlling the valve (117) to be opened and increasing the opening degree of the valve (117) at a set speed so as to introduce the refrigerant in the exhaust pipe (113) into the outdoor unit heat exchanger (114) through the connecting pipe (116) and the inlet pipe (115);
after the valve (117) is opened, if the indoor unit air outlet temperature continues for a second time higher than the first preset value and the collected temperature continues for a second time higher than the second preset value, or if the indoor unit air outlet temperature continues for a third time not higher than the first preset value, the valve (117) is controlled to keep the current opening.
2. The control method for reducing frosting according to claim 1, wherein after the step of obtaining the indoor unit outlet air temperature and the collection temperature of the preset collection point in the outdoor unit heat exchanger (114) when the start-up command is received and the start-up command indicates that the air conditioner (100) operates in the heating mode, the method further comprises:
and when the air outlet temperature of the inner machine is higher than the first preset value and the collection temperature is higher than the second preset value, controlling the valve (117) to be closed.
3. The control method for reducing frosting according to claim 1, wherein after the step of obtaining the indoor unit outlet air temperature and the collection temperature of the preset collection point in the outdoor unit heat exchanger (114) when the start-up command is received and the start-up command indicates that the air conditioner (100) operates in the heating mode, the method further comprises:
and when the air outlet temperature of the internal machine is not higher than the first preset value, controlling the valve (117) to close.
4. The method of claim 1, further comprising:
when the starting instruction indicates that the air conditioner (100) operates in an automatic mode, acquiring indoor environment temperature;
determining an operation mode of the air conditioner (100) according to the indoor ambient temperature and controlling an opening and closing state of the valve member (117), wherein the operation mode comprises a ventilation mode, a cooling mode and a heating mode.
5. The frost mitigation control method of claim 4, wherein the steps of determining an operation mode of the air conditioner (100) and controlling the open/close state of the valve member (117) according to the indoor ambient temperature comprise:
when the indoor environment temperature is higher than a third preset value and lower than a fourth preset value, determining that the air conditioner (100) operates in the ventilation mode, and controlling the valve member (117) to be closed;
when the indoor environment temperature is not lower than the fourth preset value, determining that the air conditioner (100) operates in the cooling mode, and controlling the valve member (117) to be closed;
when the indoor ambient temperature is not higher than the third preset value, determining that the air conditioner (100) is operated in the heating mode.
6. The method of claim 1, further comprising: when the starting instruction indicates that the air conditioner (100) runs in a ventilation mode, a dehumidification mode or a cooling mode, the valve element (117) is controlled to be closed.
7. The utility model provides a controlling means who slows down frosting, is applied to air conditioner (100), and its characterized in that, air conditioner (100) are including the outer machine of air conditioner (110), be provided with connecting pipe (116) between the inlet pipe (115) of blast pipe (113) and outdoor unit heat exchanger (114) of the outer machine of air conditioner (110), blast pipe (113) pass through connecting pipe (116) with inlet pipe (115) intercommunication, be provided with valve member (117) on connecting pipe (116), valve member (117) are electronic expansion valve, the device includes:
the system comprises an acquisition module (420) for acquiring the air outlet temperature of an indoor unit and the acquisition temperature of a preset acquisition point in the heat exchanger (114) of the outdoor unit when a starting-up instruction is received and the starting-up instruction indicates that the air conditioner (100) operates in a heating mode;
the control module (430) is used for controlling the valve element (117) to be opened and increasing the opening degree of the valve element (117) at a set speed when the indoor unit outlet air temperature is higher than a first preset value continuously for a first time and the collected temperature is not higher than a second preset value continuously for the first time, so that the refrigerant in the exhaust pipe (113) is led into the outdoor unit heat exchanger (114) through the connecting pipe (116) and the inlet pipe (115); the control module (430) is further configured to, after the valve element (117) is opened, control the valve element (117) to maintain the current opening degree if the indoor unit outlet air temperature continues for a second time higher than the first preset value and the collected temperature continues for a second time higher than the second preset value, or if the indoor unit outlet air temperature continues for a third time not higher than the first preset value.
8. An air conditioner, characterized by comprising a controller and an outdoor unit (110), wherein a connecting pipe (116) is arranged between an exhaust pipe (113) of the outdoor unit (110) and an inlet pipe (115) of an outdoor unit heat exchanger (114), the exhaust pipe (113) is communicated with the inlet pipe (115) through the connecting pipe (116), a valve element (117) is arranged on the connecting pipe (116), and the controller executes a computer program to perform the method according to any one of claims 1 to 6.
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| CN113237242B (en) * | 2021-05-27 | 2023-07-07 | 深圳麦克维尔空调有限公司 | Air conditioning system and control method thereof |
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| JP2825945B2 (en) * | 1990-07-09 | 1998-11-18 | 松下冷機株式会社 | Air conditioner defrost control device |
| KR20000055144A (en) * | 1999-02-03 | 2000-09-05 | 구자홍 | Method for preventing freezing of the heat exchanger in the air conditioner |
| CN101619882B (en) * | 2008-06-30 | 2011-06-22 | 珠海格力电器股份有限公司 | Intelligent control method for air conditioner |
| CN103486783B (en) * | 2013-09-26 | 2015-09-30 | 广东美的制冷设备有限公司 | Air-conditioner system and defrosting control method thereof |
| CN107575998A (en) * | 2017-09-08 | 2018-01-12 | 青岛海尔空调器有限总公司 | The defrosting control method of air-conditioning and its outdoor unit |
| CN109539501A (en) * | 2018-11-16 | 2019-03-29 | 珠海格力电器股份有限公司 | A kind of air conditioning control method, device, storage medium and air-conditioning |
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