CN107525220B - Air conditioner and outdoor unit self-cleaning control method thereof - Google Patents
Air conditioner and outdoor unit self-cleaning control method thereof Download PDFInfo
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- CN107525220B CN107525220B CN201710641148.7A CN201710641148A CN107525220B CN 107525220 B CN107525220 B CN 107525220B CN 201710641148 A CN201710641148 A CN 201710641148A CN 107525220 B CN107525220 B CN 107525220B
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- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
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Abstract
The invention provides an air conditioner and an outdoor unit self-cleaning control method thereof, wherein an outdoor unit heat exchange assembly comprises: the control method comprises the following steps of connecting a first outdoor heat exchanger and a second outdoor heat exchanger in series, wherein the first outdoor heat exchanger is connected to a compressor through a refrigerant flow direction switching device, an electronic expansion valve is arranged between the first outdoor heat exchanger and the second outdoor heat exchanger, and the control method comprises the following steps: adjusting the refrigerant flow direction switching device to a state of providing compressed refrigerant for the indoor unit heat exchange assembly; adjusting the opening degree of the electronic expansion valve to continuously frost the surface of the first outdoor heat exchanger; after a preset first defrosting condition is met, switching a refrigerant flow direction switching device to change the refrigerant flow direction, and carrying out self-cleaning on the first outdoor heat exchanger by utilizing water formed by defrosting to remove attached pollutants; after the preset second defrosting condition is met, the opening degree of the electronic expansion valve is opened to the maximum, the second outdoor heat exchanger releases heat, and self-cleaning of the second outdoor heat exchanger is achieved.
Description
Technical Field
The invention relates to a household air conditioner, in particular to an air conditioner and an outdoor unit self-cleaning control method thereof.
Background
After the air conditioner is placed or used for a long time, a large amount of dust and dirt can be accumulated outside the air conditioner. The dust adheres to the heat exchanger of the outdoor unit, which reduces the heat exchange performance of the heat exchanger, reduces the performance of the air conditioner, and increases the power consumption.
The scheme that traditional air conditioner adopted generally maintains the off-premises station seldom, generally relies on its comdenstion water or the weather of environment to wash, and the cleaning performance of off-premises station is hardly guaranteed to this kind of mode, and long-term operation leads to the heat exchange efficiency greatly reduced of off-premises station.
Disclosure of Invention
An object of the present invention is to provide an air conditioner having a self-cleaning function and a control method thereof, which solve at least some of the above technical problems.
A further object of the present invention is to improve heat exchange efficiency by cleaning an outdoor unit heat exchange assembly.
Another further purpose of the present invention is to avoid the influence of the user experience caused by the drastic fluctuation of the working temperature of the indoor unit during the process of cleaning the heat-dissipating components of the outdoor unit.
According to an aspect of the present invention, there is provided an outdoor unit self-cleaning control method for an air conditioner, wherein a refrigeration system of the air conditioner includes an indoor unit heat exchange assembly, a refrigerant flow direction switching device, a compressor, an outdoor unit heat exchange assembly, and a throttling device, which are sequentially connected in series by a refrigerant pipeline, wherein the outdoor unit heat exchange assembly includes: the control method comprises the following steps of connecting a first outdoor heat exchanger and a second outdoor heat exchanger in series, wherein the first outdoor heat exchanger is connected to a compressor through a refrigerant flow direction switching device, an electronic expansion valve is arranged between the first outdoor heat exchanger and the second outdoor heat exchanger, and the control method comprises the following steps: receiving a trigger signal for starting a self-cleaning function of the air conditioner; adjusting the refrigerant flow direction switching device to a state that the compressor provides compressed refrigerant for the indoor unit heat exchange assembly; adjusting the opening degree of the electronic expansion valve to continuously frost the surface of the first outdoor heat exchanger; after a preset first defrosting condition is met, switching a refrigerant flow direction switching device to change the refrigerant flow direction, so that the first outdoor heat exchanger releases heat to defrost, and carrying out self-cleaning on the first outdoor heat exchanger by utilizing water formed by defrosting to remove attached pollutants; the surface of the second outdoor heat exchanger continues to frost by adjusting the opening degree of the electronic expansion valve until a preset second defrosting condition is met, the opening degree of the electronic expansion valve is opened to the maximum, the second outdoor heat exchanger releases heat, and water formed by defrosting is used for removing attached pollutants, so that the second outdoor heat exchanger is self-cleaned.
Optionally, the step of adjusting the opening degree of the electronic expansion valve such that the surface of the first outdoor heat exchanger continuously frosts includes: detecting the temperature of the first outdoor heat exchanger; reducing the opening degree of the electronic expansion valve according to the temperature of the first outdoor heat exchanger, so that the temperature of the first outdoor heat exchanger is reduced to a first set temperature; and keeping the opening degree of the electronic expansion valve when the temperature of the first outdoor heat exchanger is reduced to a first set temperature, and continuously frosting the surface of the first outdoor heat exchanger until a first defrosting condition is met.
Optionally, the first defrosting condition comprises: the temperature of the first outdoor heat exchanger is reduced to a second set temperature or the time for maintaining the opening degree of the electronic expansion valve exceeds a first set time, and the second set temperature is lower than the first set temperature.
Optionally, the process of causing the first outdoor heat exchanger to release heat further comprises: detecting the temperature of the first outdoor heat exchanger; and after the temperature of the first outdoor heat exchanger reaches a preset first defrosting cut-off temperature, determining that the self-cleaning of the first outdoor heat exchanger is finished.
Optionally, the step of continuing frosting the surface of the second outdoor heat exchanger by adjusting the opening degree of the electronic expansion valve comprises: detecting the temperature of the second outdoor heat exchanger; adjusting the opening degree of the electronic expansion valve according to the temperature of the second outdoor heat exchanger, so that the temperature of the second outdoor heat exchanger is reduced to a third set temperature; and keeping the opening degree of the electronic expansion valve when the temperature of the second outdoor heat exchanger is reduced to a third set temperature, and continuously frosting the surface of the second outdoor heat exchanger until a second defrosting condition is met.
Optionally, the second defrosting condition comprises: the temperature of the second outdoor heat exchanger is lowered to a fourth set temperature or the time for which the opening degree of the electronic expansion valve is maintained exceeds a second set time, and the fourth set temperature is lower than a third set temperature.
Optionally, the process of causing the second outdoor heat exchanger to release heat further includes: detecting the temperature of the second outdoor heat exchanger; and after the temperature of the second outdoor heat exchanger reaches the preset second frost removal cutoff temperature, determining that the self-cleaning of the second outdoor heat exchanger is finished.
According to another aspect of the present invention, there is also provided an air conditioner including a refrigeration system and a self-cleaning controller, wherein the refrigeration system includes: indoor set heat transfer subassembly, refrigerant flow direction auto-change over device, compressor, off-premises station heat transfer subassembly and throttling arrangement that are concatenated in proper order by the refrigerant pipeline, and wherein the off-premises station heat transfer subassembly includes: the system comprises a first outdoor heat exchanger and a second outdoor heat exchanger which are connected in series, wherein the second outdoor heat exchanger is connected to a compressor through a refrigerant flow direction switching device, and an electronic expansion valve is arranged between the first outdoor heat exchanger and the second outdoor heat exchanger; a self-cleaning controller electrically connected to the refrigeration system and configured to: receiving a trigger signal for starting a self-cleaning function of the air conditioner; adjusting the refrigerant flow direction switching device to a state that the compressor provides compressed refrigerant for the indoor unit heat exchange assembly; adjusting the opening degree of the electronic expansion valve to continuously frost the surface of the first outdoor heat exchanger; after a preset first defrosting condition is met, switching a refrigerant flow direction switching device to change the refrigerant flow direction, so that the first outdoor heat exchanger releases heat to defrost, and carrying out self-cleaning on the first outdoor heat exchanger by utilizing water formed by defrosting to remove attached pollutants; the opening degree of the electronic expansion valve is adjusted, so that the surface of the second outdoor heat exchanger continues to frost until a preset second defrosting condition is met, the opening degree of the electronic expansion valve is opened to the maximum, the second outdoor heat exchanger releases heat, water formed by defrosting is used for removing attached pollutants, and self-cleaning of the second outdoor heat exchanger is achieved to defrost.
Optionally, the self-cleaning controller is further configured to: detecting the temperature of the first outdoor heat exchanger; reducing the opening degree of the electronic expansion valve according to the temperature of the first outdoor heat exchanger, so that the temperature of the first outdoor heat exchanger is reduced to a first set temperature; keeping the opening degree of the electronic expansion valve when the temperature of the first outdoor heat exchanger is reduced to a first set temperature, and continuously frosting the surface of the first outdoor heat exchanger until a first defrosting condition is met, wherein the first defrosting condition comprises the following steps: the temperature of the first outdoor heat exchanger is reduced to a second set temperature or the time for keeping the opening degree of the electronic expansion valve exceeds a first set time, and the second set temperature is lower than the first set temperature; and after the temperature of the first outdoor heat exchanger reaches a preset first defrosting cut-off temperature, determining that the self-cleaning of the first outdoor heat exchanger is finished.
Optionally, the self-cleaning controller is further configured to: detecting the temperature of the second outdoor heat exchanger; adjusting the opening degree of the electronic expansion valve according to the temperature of the second outdoor heat exchanger, so that the temperature of the second outdoor heat exchanger is reduced to a third set temperature; keeping the opening degree of the electronic expansion valve when the temperature of the second outdoor heat exchanger is reduced to a third set temperature, and continuously frosting the surface of the second outdoor heat exchanger until a second defrosting condition is met, wherein the second defrosting condition comprises the following steps: the temperature of the second outdoor heat exchanger is reduced to a fourth set temperature or the time for keeping the opening degree of the electronic expansion valve exceeds a second set time, and the fourth set temperature is lower than a third set temperature; and after the temperature of the second outdoor heat exchanger reaches the preset second frost removal cutoff temperature, determining that the self-cleaning of the second outdoor heat exchanger is finished.
The air conditioner and the outdoor unit self-cleaning control method thereof are particularly suitable for improving the structure of a heat exchange assembly of the outdoor unit when the air conditioner runs in a heating state, the first outdoor heat exchanger and the second outdoor heat exchanger which are connected in series are arranged, the electronic expansion valve is additionally arranged between the first outdoor heat exchanger and the second outdoor heat exchanger, and the first outdoor heat exchanger and the second outdoor heat exchanger respectively execute self-cleaning processes by adjusting the flow direction of a refrigerant and the opening degree of the electronic expansion valve, so that the outdoor heat exchanger can be cleaned, the heat exchange efficiency of the outdoor heat exchanger is improved, the influence on normal heating of the indoor unit can be reduced, the severe fluctuation of the temperature is prevented, and better use experience is brought to users.
Further, the air conditioner and the outdoor unit self-cleaning control method thereof optimize the self-cleaning processes of the first outdoor heat exchanger and the second outdoor heat exchanger, so that the consumed time is less, and the self-cleaning effect is better.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
FIG. 1 is a schematic functional block diagram of an air conditioner according to one embodiment of the present invention;
FIG. 2 is a schematic diagram of a refrigeration system of an air conditioner according to one embodiment of the present invention;
fig. 3 is a schematic view illustrating an outdoor unit self-cleaning control method of an air conditioner according to an embodiment of the present invention;
fig. 4 is a flowchart for implementing self-cleaning of a first outdoor heat exchanger in an outdoor unit self-cleaning control method of an air conditioner according to an embodiment of the present invention;
fig. 5 is a flowchart for implementing self-cleaning of a second outdoor heat exchanger in an outdoor unit self-cleaning control method of an air conditioner according to an embodiment of the present invention; and
fig. 6 is a flowchart illustrating an exemplary implementation of a method for controlling self-cleaning of an outdoor unit of an air conditioner according to an exemplary embodiment of the present invention.
Detailed Description
Fig. 1 is a schematic functional block diagram of an air conditioner 10 according to one embodiment of the present invention. Fig. 2 is a schematic diagram of a refrigeration system of the air conditioner 10 according to one embodiment of the present invention.
The air conditioner 10 generally includes an air conditioner indoor unit 100 and an air conditioner outdoor unit 200, and the air conditioner indoor unit 100 and the air conditioner outdoor unit 200 complete cooling and heating cycles of the air conditioner through efficient cooperation, so as to achieve cooling and heating adjustment of indoor temperature. The refrigeration system of the air conditioner 10 may be implemented using a compression refrigeration cycle, which uses a compression phase change cycle of a refrigerant in the compressor 250, the condenser, the evaporator, and the throttling device 240 to implement heat transfer. The refrigeration system may further include a refrigerant flow direction switching device 260, which changes the flow direction of the refrigerant, so that the indoor unit heat exchange assembly 110 is alternately used as an evaporator or a condenser, and correspondingly, the outdoor unit heat exchange assembly 210 is alternately used as a condenser or an evaporator, to implement a cooling or heating function, and the refrigerant flow direction switching device 260 is generally implemented by a four-way valve.
The working principle of the compression refrigeration cycle is as follows: the compressor 250 is a power of a refrigeration cycle, is driven by a motor to rotate continuously, and not only timely extracts vapor in the evaporator to maintain low temperature and low pressure, but also improves the pressure and temperature of refrigerant vapor through compression action to create a condition for transferring the heat of the refrigerant vapor to an external environment medium. I.e., compressing the low temperature, low pressure refrigerant vapor to a high temperature, high pressure state.
The condenser is a heat exchange device and is used for taking away heat of high-temperature and high-pressure refrigeration steam from the compressor 250 by utilizing an environment cooling refrigerant, so that the high-temperature and high-pressure refrigeration steam is cooled and condensed into high-pressure and normal-temperature refrigeration liquid.
The refrigerant liquid with high pressure and normal temperature is directly sent into the evaporator, and the pressure of the refrigerant liquid is reduced according to the corresponding principle of saturation pressure and saturation temperature, so that the temperature of the refrigerant liquid is reduced. The refrigerant liquid with high pressure and normal temperature passes through the throttling device 240 to obtain low-temperature and low-pressure refrigerant, and then is sent into the evaporator for heat absorption and evaporation. A capillary tube may be generally employed as the throttling device 240 in the air conditioner 10.
The evaporator is also a heat exchange device. The throttled low-temperature and low-pressure refrigerant liquid is evaporated (boiled) therein to become vapor, and absorbs ambient heat to lower the ambient temperature.
The refrigerant flow direction switching device 260 is configured to switch a flow direction of a refrigerant in a compression refrigeration cycle, for example, in a heating process of the air conditioner 10, the compressor 250 provides the compressed refrigerant to the indoor heat exchange assembly 110, the indoor heat exchange assembly 110 is used as a condenser, the refrigerant is condensed by the indoor heat exchange assembly 110 and then sent to the outdoor heat exchange assembly 210 through the throttling device 240, and the outdoor heat exchange assembly 210 absorbs external heat and then sends the refrigerant to the compressor 250 again. In the refrigeration process of the air conditioner 10, the compressor 250 provides a compressed refrigerant to the outdoor heat exchange assembly 210, the outdoor heat exchange assembly 210 is used as a condenser, the refrigerant is condensed by the outdoor heat exchange assembly 210 and then sent to the indoor heat exchange assembly 110 through the throttling device 240, the indoor heat exchange assembly 110 absorbs external heat to cool surrounding air, the effects of cooling and dehumidifying the air are achieved, and then the refrigerant is sent to the compressor 250 again.
In addition, the indoor fan 120 and the outdoor fan 220 in the refrigeration system generate air flows that exchange heat with the indoor heat exchange assembly 110 and the outdoor heat exchange assembly 210, respectively.
Since the air conditioner 10 may accumulate dust on the indoor unit heat exchange assembly 110 and the outdoor unit heat exchange assembly 210 during the use and placement process, the air conditioner 10 is a potential pollution source in the environment. The self-cleaning technology in the prior art is generally directed to the indoor unit heat exchange assembly 110, but there is no special cleaning means for the outdoor unit heat exchange assembly 120, but the long-term accumulated dust inevitably causes the heat exchange efficiency of the outdoor unit heat exchange assembly 210 to be reduced, which does not lead to sufficient loyalty in the prior art.
The air conditioner 10 of the present embodiment takes the following structural improvements in view of the above problems: the outdoor heat exchange assembly 210 includes: a first outdoor heat exchanger 211 and a second outdoor heat exchanger 212 connected in series, wherein the first outdoor heat exchanger 211 is connected to the compressor 250 through a refrigerant flow direction switching device 260, and an electronic expansion valve 230 is disposed between the first outdoor heat exchanger 211 and the second outdoor heat exchanger 212. The second outdoor heat exchanger 212 is communicated to the indoor heat exchange assembly 110 through a throttling device 240. The electronic expansion valve 230 is kept in an open state during normal operation, so that cooling or heating is not affected, and the opening degree of the electronic expansion valve 230 can be controllably adjusted during self-cleaning.
The air conditioner 10 of this embodiment further includes a self-cleaning controller 150, and the self-cleaning controller 150 may be implemented by an original control board of the air conditioner 10 by configuring a self-cleaning control program or by presetting a self-cleaning control logic, and since the hardware structure of the self-cleaning controller 150 is well known by those skilled in the art, it is not described herein again.
The self-cleaning controller 150 performs the self-cleaning control process as follows: receiving a trigger signal for starting a self-cleaning function of the air conditioner 10 (for example, receiving a self-cleaning control instruction issued by a user through a remote controller or a human-computer interaction interface of the air conditioner 10, or receiving a trigger instruction generated when the air conditioner 10 determines that self-cleaning is required according to a working state of the air conditioner 10); after receiving the trigger signal, the refrigerant flow direction switching device 260 is adjusted to a state where the compressor 250 provides the compressed refrigerant to the indoor unit heat exchange assembly 110 (i.e. switched to the heating state of the air conditioner 10, and if the indoor unit heat exchange assembly is in the heating state, the state is maintained); by adjusting the opening degree of the electronic expansion valve 230, frost continues to be formed on the surface of the first outdoor heat exchanger 211, and thus water sufficient to wash the first outdoor heat exchanger 211 is accumulated. After a preset first defrosting condition is met, the refrigerant flow direction switching device 260 is switched to change the refrigerant flow direction, so that the first outdoor heat exchanger releases heat to defrost, and the water formed by defrosting is used for removing attached pollutants, so that the first outdoor heat exchanger is self-cleaned.
The self-cleaning controller 150 continuously adjusts the opening degree of the electronic expansion valve 230 so that the surface of the second outdoor heat exchanger 212 continues to be frosted, and after the refrigerant flow direction switching device 260 switches, the second outdoor heat exchanger 212 is used as a main evaporator due to the throttling function of the electronic expansion valve 230, so that the temperature fluctuation of the indoor unit heat exchange assembly 110 can be reduced. After the preset second defrosting condition is met, the opening degree of the electronic expansion valve 230 is opened to the maximum, so that the second outdoor heat exchanger 212 releases heat, and the water formed by defrosting is used for removing attached pollutants, so that the second outdoor heat exchanger 212 is self-cleaned to defrost.
Through the sectional type cleaning process, the influence on the heat exchange assembly 110 of the indoor unit can be reduced in the cleaning process, and the fluctuation of the temperature of the working environment is avoided.
The self-cleaning controller 150 adjusts the opening degree of the electronic expansion valve 230, so that the continuous frosting process of the surface of the first outdoor heat exchanger 211 is specifically as follows: detecting a temperature of the first outdoor heat exchanger 211 (e.g., a coil temperature of the first outdoor heat exchanger 211); adjusting the opening degree of the electronic expansion valve 230 according to the temperature of the first outdoor heat exchanger 211 such that the temperature of the first outdoor heat exchanger 211 is lowered to a first set temperature; keeping the opening degree of the electronic expansion valve 230 when the temperature of the first outdoor heat exchanger 211 is reduced to a first set temperature, so that the surface of the first outdoor heat exchanger 211 continuously frosts until a set first defrosting condition is met; after the first defrosting condition is met, the refrigerant flow direction switching device 260 is switched to change the refrigerant flow direction, so that the first outdoor heat exchanger 211 releases heat to defrost, and the water formed by defrosting is used for removing attached pollutants, thereby realizing self-cleaning of the first outdoor heat exchanger 211.
The first defrosting condition includes: the temperature of the first outdoor heat exchanger 211 is lowered to a second set temperature, which is lower than the first set temperature, or the time during which the opening degree of the electronic expansion valve 230 is maintained exceeds the first set time. After the first defrosting condition described above is satisfied, it can be considered that the first heat exchanger has finished frosting. And the compressor 250 may maintain its operation frequency inconvenient and turn off the indoor and outdoor fans 120 and 220 during the first heat exchanger frosting process.
After the self-cleaning controller 150 determines that the first defrosting condition is met, the first outdoor heat exchanger 211 releases heat, the first outdoor heat exchanger 211 is changed to operate in a condenser state, the heat is released to defrost, and the water formed by defrosting is used for removing attached pollutants, so that the self-cleaning of the first outdoor heat exchanger 211 is realized. The self-cleaning controller 150 determines that the self-cleaning of the first outdoor heat exchanger 211 is completed if it is confirmed that the temperature of the first outdoor heat exchanger 211 reaches a preset first frost cut-off temperature in the process of heat release of the first outdoor heat exchanger 211.
After the electronic expansion valve 230 adjusts the opening degree, a throttling effect can be achieved, and in the process, the second outdoor heat exchanger 212 can keep a refrigeration state and still operate as an evaporator, so that the influence of the indoor unit heat exchange assembly 110 on the surrounding environment is effectively reduced, and the discomfort brought to users by cold air output is avoided.
After completing the self-cleaning process of the first outdoor heat exchanger 211, the self-cleaning controller 150 may further continue to perform the self-cleaning process of the second outdoor heat exchanger 212, that is, by adjusting the opening degree of the electronic expansion valve 230, the surface of the second outdoor heat exchanger 212 continues to be frosted until a preset second defrosting condition is met, and then open the opening degree of the electronic expansion valve 230 to the maximum, so that the second outdoor heat exchanger 212 releases heat, and the water formed by defrosting is used to remove attached pollutants, thereby implementing the self-cleaning of the second outdoor heat exchanger for defrosting. The second frost removal condition includes: the temperature of the second outdoor heat exchanger 212 is lowered to the fourth set temperature or the time during which the opening degree of the electronic expansion valve 230 is maintained exceeds the second set time; the fourth set temperature is lower than the third set temperature.
Therefore, in the self-cleaning process of the second outdoor heat exchanger 212, the process is similar to the self-cleaning process of the first outdoor heat exchanger 211, that is, the electronic expansion valve 230 is utilized to realize the throttling function, so that the second outdoor heat exchanger 212 continuously frosts, enough water for cleaning is accumulated, and then the electronic expansion valve 230 is opened to quickly defrost, thereby achieving the self-cleaning purpose. The self-cleaning controller 150 determines that the self-cleaning of the second outdoor heat exchanger 212 is completed if it is confirmed that the temperature of the second outdoor heat exchanger 212 reaches the preset second frost cut-off temperature in the process of releasing heat of the second outdoor heat exchanger 212.
In the self-cleaning process, the first set temperature, the second set temperature, the third set temperature, the fourth set temperature, the first frost cut-off temperature, and the second frost cut-off temperature may all be obtained by testing according to actual specifications and operating environments of the air conditioner 10, for example, the first set temperature and the third set temperature may be set to-5 ℃, and the second set temperature and the fourth set temperature may be set to-15 ℃ (in the case where the values are 30 ℃ both indoors and outdoors, a result obtained by testing a specific air conditioner may be adjusted within a certain range according to circumstances in specific implementation). The first setting time and the second setting time can be set correspondingly, so that the first outdoor heat exchanger 211 or the second outdoor heat exchanger 212 cannot reach the second setting temperature and the fourth setting temperature under special working conditions. The first frost cut-off temperature and the second frost cut-off temperature may be obtained by testing the heat exchange processes of the first outdoor heat exchanger 211 and the second outdoor heat exchanger 212, and may be set to 50 ℃. After the self-cleaning is completed, the outdoor unit fan 220 may supply air to dry the outdoor unit heat exchanger assembly 210.
In the self-cleaning process, extra energy consumption may be caused by switching the flow path of the refrigerant and starting and stopping the compressor 250, so that the self-cleaning controller 150 may first measure the working environment temperature of the indoor unit 100 of the air conditioner after receiving the trigger signal for starting the self-cleaning function of the air conditioner 10; when the working environment temperature is higher than the fifth set temperature, the electronic expansion valve 130 is placed in a controlled state; when the working environment temperature is lower than the fifth set temperature, the initial open state of the electronic expansion valve 230 is maintained, and the overall self-cleaning process of the outdoor unit heat exchange assembly 210 is performed. For example, when the fifth set temperature is set to 26 ℃, it is considered that the outdoor heat exchange assembly 210 may be entirely self-cleaned in an environment below 26 ℃. If the ambient temperature is higher than 26 ℃, the above-described processes of self-cleaning the first and second outdoor heat exchangers 211 and 212, respectively, may be performed. It should be noted that the setting of the fifth setting temperature to 26 ℃ is only an example, and in the specific implementation of the present embodiment, the fifth setting temperature may be set according to the actual experience of the user.
An embodiment of the present invention further provides a self-cleaning control method for an outdoor unit 200 of an air conditioner 10, where the self-cleaning control method for the outdoor unit 100 of the air conditioner 10 is used for performing self-cleaning control on the air conditioner 10 in the above-mentioned embodiment and may be executed by the self-cleaning controller 150 in the above-mentioned embodiment, fig. 3 is a schematic diagram of the self-cleaning control method for the outdoor unit 200 of the air conditioner 10 according to an embodiment of the present invention, and the self-cleaning control method for the outdoor unit 200 of the air conditioner 10 may generally include:
step S302, receiving a trigger signal for the air conditioner 10 to start the self-cleaning function, for example, receiving a self-cleaning control command issued by a user through a remote controller or a human-computer interaction interface of the air conditioner 10, or receiving a trigger command generated by the air conditioner 10 to determine that self-cleaning is required according to its working state.
Step S304, adjusting the refrigerant flow direction switching device to a state that the compressor 250 provides compressed refrigerant to the indoor unit heat exchange assembly 110, that is, to a heating state of the air conditioner 10, and if the indoor unit heat exchange assembly is in the heating state, maintaining the state;
step S306, continuously frosting the surface of the first outdoor heat exchanger 211 by adjusting the opening degree of the electronic expansion valve 230;
step 308, after a preset first defrosting condition is met, switching the refrigerant flow direction switching device 260 to change the refrigerant flow direction, so that the first outdoor heat exchanger 211 releases heat to defrost, and the water formed by defrosting is used for removing attached pollutants to realize self-cleaning of the first outdoor heat exchanger 211;
step S310, by adjusting the opening degree of the electronic expansion valve 230, the surface of the second outdoor heat exchanger 212 continues to frost;
step S312, after the preset second defrosting condition is met, the opening degree of the electronic expansion valve 230 is opened to the maximum, so that the second outdoor heat exchanger 212 releases heat, and the water formed by defrosting is used to remove the attached pollutants, thereby implementing self-cleaning of the second outdoor heat exchanger 212 for defrosting.
Fig. 4 is a flowchart of implementing self-cleaning of the first outdoor heat exchanger 211 in the method for controlling self-cleaning of the outdoor unit 200 of the air conditioner 10 according to an embodiment of the present invention, where the flowchart specifically includes:
in step S402, the temperature of the first outdoor heat exchanger 211 is detected, for example, by obtaining the coil temperature of the first outdoor heat exchanger 211.
Step S404, adjusting the opening degree of the electronic expansion valve 230 according to the temperature of the first outdoor heat exchanger 211, so that the temperature of the first outdoor heat exchanger 211 is decreased to a first set temperature;
step S406, maintaining the opening degree of the electronic expansion valve 230 when the temperature of the first outdoor heat exchanger 211 is decreased to the first set temperature, so that the surface of the first outdoor heat exchanger 211 continuously frosts until a set first defrosting condition is met, where the first defrosting condition includes: the temperature of the first outdoor heat exchanger 211 is lowered to a second set temperature, which is lower than the first set temperature, or the time during which the opening degree of the electronic expansion valve 230 is maintained exceeds the first set time.
In step S408, after the first defrosting condition is satisfied, the flow direction of the refrigerant is reversed, and the first outdoor heat exchanger 211 releases heat to defrost.
In step S410, after the temperature of the first outdoor heat exchanger 211 reaches a preset first frost cut-off temperature, it is determined that the self-cleaning of the first outdoor heat exchanger 211 is completed.
After the first outdoor heat exchanger 211 completes self-cleaning, the method for controlling self-cleaning of the outdoor unit 200 of the air conditioner 10 according to the embodiment may further perform self-cleaning on the second outdoor heat exchanger 212. Fig. 5 is a flowchart illustrating a self-cleaning process of the second outdoor heat exchanger 212 in the method for controlling the self-cleaning of the outdoor unit 200 of the air conditioner 10 according to an embodiment of the present invention, wherein the self-cleaning process of the second outdoor heat exchanger 212 includes:
step S502, detecting the temperature of the second outdoor heat exchanger 212;
step S504, adjusting the opening degree of the electronic expansion valve 230 according to the temperature of the second outdoor heat exchanger 212, so that the temperature of the second outdoor heat exchanger 212 is decreased to a third set temperature;
step S506, keeping the opening degree of the electronic expansion valve 230 when the temperature of the second outdoor heat exchanger 212 is decreased to the third set temperature, so that the surface of the second outdoor heat exchanger 212 continuously frosts until the second defrosting condition is met;
step S508, after the second defrosting condition is met, opening the electronic expansion valve 230 to the maximum, so that the second outdoor heat exchanger 212 releases heat;
in step S510, after the temperature of the second outdoor heat exchanger 212 reaches the preset second frost cut-off temperature, it is determined that the self-cleaning of the second outdoor heat exchanger 212 is completed.
In the self-cleaning process, extra energy consumption may be caused by switching the flow path of the refrigerant and starting and stopping the compressor 250, so that the self-cleaning controller 150 may first measure the working environment temperature of the indoor unit 100 of the air conditioner after receiving the trigger signal for starting the self-cleaning function of the air conditioner 10; when the working environment temperature is higher than the fifth set temperature, the electronic expansion valve 130 is placed in a controlled state; when the working environment temperature is lower than the fifth set temperature, the initial open state of the electronic expansion valve 230 is maintained, and the overall self-cleaning process of the outdoor unit heat exchange assembly 210 is performed. For example, when the fifth set temperature is set to 26 ℃, it is considered that the outdoor heat exchange assembly 210 may be entirely self-cleaned in an environment below 26 ℃. If the ambient temperature is higher than 26 ℃, the above-described processes of self-cleaning the first and second outdoor heat exchangers 211 and 212, respectively, may be performed. It should be noted that the setting of the fifth setting temperature to 26 ℃ is only an example, and in the specific implementation of the present embodiment, the fifth setting temperature may be set according to the actual experience of the user.
In the self-cleaning process, the first set temperature, the second set temperature, the third set temperature, the fourth set temperature, the first frost cut-off temperature, and the second frost cut-off temperature may all be obtained by testing according to actual specifications and operating environments of the air conditioner 10, for example, the first set temperature and the third set temperature may be set to-5 ℃, and the second set temperature and the fourth set temperature may be set to-15 ℃ (in the case where the values are 30 ℃ both indoors and outdoors, a result obtained by testing a specific air conditioner may be adjusted within a certain range according to circumstances in specific implementation). The first setting time and the second setting time can be set correspondingly, so that the first outdoor heat exchanger 211 or the second outdoor heat exchanger 212 cannot reach the second setting temperature and the fourth setting temperature under special working conditions. The first frost cut-off temperature and the second frost cut-off temperature may be obtained by testing the heat exchange processes of the first outdoor heat exchanger 211 and the second outdoor heat exchanger 212, and may be set to 50 ℃. After the self-cleaning is completed, the outdoor unit fan 220 may supply air to dry the outdoor unit heat exchanger assembly 210.
For example, the first set temperature and the third set temperature are set to be-5 ℃, the second set temperature and the fourth set temperature are set to be-15 ℃, the defrosting temperature is set to be 50 ℃, the first set time and the second set time are set to be 10 minutes, the first defrosting cut-off temperature and the second defrosting cut-off temperature are set to be 50 ℃, and the fifth set temperature is set to be 26 ℃. Describing the process of completing the whole outdoor unit heat exchange assembly 210, fig. 6 is a flowchart illustrating an implementation of a self-cleaning control method for the outdoor unit 200 of the air conditioner 10 according to an embodiment of the present invention, where the flowchart includes:
step S602, in the heating process of the air conditioner 10, receiving a trigger signal for starting the self-cleaning function of the air conditioner 10;
step S604, obtaining an ambient temperature of the working environment of the indoor unit 100, and determining whether the ambient temperature is higher than 26 ℃, if the ambient temperature is lower than 26 ℃, performing step S640, and performing an overall self-cleaning process of the outdoor unit heat exchange assembly 210;
step S606, when the ambient temperature is higher than 26 ℃, adjusting the refrigerant flow direction switching device to a state where the compressor 250 provides compressed refrigerant to the indoor unit heat exchange assembly 110, that is, keeping the heating state of the air conditioner 10;
step S608, the indoor fan 120 and the outdoor fan 220 are stopped, and the compressor 250 is operated at a preset target frequency (the preset target frequency is selected according to indoor and outdoor temperatures, for example, the preset target frequency may be set to 50Hz under the condition that the indoor temperature and the outdoor temperature are both 30 ℃);
step S610, detecting the coil temperature TP1 of the first outdoor heat exchanger 211, reducing the opening degree of the electronic expansion valve 230, and gradually reducing TP1 to-5 ℃;
step S612, keeping the opening degree of the electronic expansion valve 230 when TP1 is decreased to-5 ℃, so that the surface of the first outdoor heat exchanger 211 continuously frosts;
step S614, judging whether TP1 is reduced to-15 ℃;
step S616, determining that the opening duration of the electronic expansion valve 230 is longer than 10 minutes;
step S618, when any of the conditions that TP1 is decreased to-15 ℃ and the opening duration retention time exceeds 10 minutes is met, reversing the refrigerant flow direction to the switching device (four-way valve) 260, so that the first outdoor heat exchanger 211 releases heat to defrost, and using water formed by defrosting to remove attached pollutants, thereby implementing self-cleaning of the first outdoor heat exchanger 211;
step S620, judging whether TP1 reaches a first frost cutoff temperature of 50 ℃;
in step S622, the first outdoor heat exchanger 211 finishes self-cleaning;
step S624, detecting the coil temperature TP2 of the first heat exchanger;
step S626, adjusting the opening degree of the electronic expansion valve 230 to gradually reduce TP2 to-5 ℃;
step S628, maintaining the opening degree of the electronic expansion valve 230 when TP2 is decreased to-5 ℃, so as to continuously frost the surface of the second outdoor heat exchanger 212;
step S630, judging whether TP2 is reduced to-15 ℃;
step S632 of determining that the opening degree continuous retention time of the electronic expansion valve 230 exceeds 10 minutes;
step S634, when any one of the conditions that TP2 is lowered to-15 ℃ and the opening duration retention time exceeds 10 minutes is met, the opening of the electronic expansion valve 230 is opened to the maximum, the second outdoor heat exchanger 212 releases heat, and water formed by defrosting is used for removing attached pollutants, so that self-cleaning of the second outdoor heat exchanger 212 is realized;
step S636, judging whether TP2 reaches a second frost cut-off temperature setting of 50 ℃;
in step S638, the second outdoor heat exchanger 212 ends self-cleaning.
In the process of implementing the method, the specific judgment threshold value may be adjusted according to the specification of the air conditioner 10, the operating environment, and the user's habit, and the specific value is only an example.
The method for controlling self-cleaning of the outdoor unit 200 of the air conditioner 10 in this embodiment respectively performs the self-cleaning processes of the first outdoor heat exchanger 211 and the second outdoor heat exchanger 212, so as to effectively clean the heat exchange assembly 210 of the outdoor unit, improve the heat exchange efficiency of the outdoor unit, have little influence on the indoor unit, prevent the temperature of the indoor unit from being fluctuated severely, and bring better use experience to users.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (10)
1. An outdoor unit self-cleaning control method of an air conditioner is disclosed, wherein a refrigeration system of the air conditioner comprises an indoor unit heat exchange assembly, a refrigerant flow direction switching device, a compressor, an outdoor unit heat exchange assembly and a throttling device which are sequentially connected in series through a refrigerant pipeline, wherein the outdoor unit heat exchange assembly comprises: a first outdoor heat exchanger and a second outdoor heat exchanger connected in series, wherein the first outdoor heat exchanger is connected to the compressor through the refrigerant flow direction switching device, an electronic expansion valve is provided between the first outdoor heat exchanger and the second outdoor heat exchanger, and the control method includes:
receiving a trigger signal for starting a self-cleaning function of the air conditioner;
adjusting the refrigerant flow direction switching device to a state that the compressor provides compressed refrigerant for the indoor unit heat exchange assembly;
adjusting the opening degree of the electronic expansion valve to continuously frost the surface of the first outdoor heat exchanger;
after a preset first defrosting condition is met, switching the refrigerant flow direction switching device to change the refrigerant flow direction, so that the first outdoor heat exchanger releases heat to defrost, and carrying out self-cleaning on the first outdoor heat exchanger by utilizing water formed by defrosting to remove attached pollutants;
and continuously frosting the surface of the second outdoor heat exchanger by adjusting the opening degree of the electronic expansion valve until a preset second defrosting condition is met, opening the opening degree of the electronic expansion valve to the maximum, releasing heat of the second outdoor heat exchanger, and taking away attached pollutants by using water formed by defrosting to realize self-cleaning of the second outdoor heat exchanger.
2. The control method according to claim 1, wherein the step of adjusting the opening degree of the electronic expansion valve such that the surface of the first outdoor heat exchanger continues to be frosted includes:
detecting a temperature of the first outdoor heat exchanger;
reducing the opening degree of the electronic expansion valve according to the temperature of the first outdoor heat exchanger, so that the temperature of the first outdoor heat exchanger is reduced to a first set temperature;
and keeping the opening degree of the electronic expansion valve when the temperature of the first outdoor heat exchanger is reduced to a first set temperature, and continuously frosting the surface of the first outdoor heat exchanger until the first defrosting condition is met.
3. The control method according to claim 1 or 2, wherein,
the first defrosting condition includes: the temperature of the first outdoor heat exchanger is reduced to a second set temperature or the time for maintaining the opening degree of the electronic expansion valve exceeds a first set time, and the second set temperature is lower than the first set temperature.
4. The control method according to claim 1 or 2, wherein in causing the first outdoor heat exchanger to release heat, further comprising:
detecting a temperature of the first outdoor heat exchanger;
and determining that the self-cleaning of the first outdoor heat exchanger is finished after the temperature of the first outdoor heat exchanger reaches a preset first defrosting cut-off temperature.
5. The control method according to claim 1, wherein the step of continuing frosting of the surface of the second outdoor heat exchanger by adjusting the opening degree of the electronic expansion valve includes:
detecting a temperature of the second outdoor heat exchanger;
adjusting the opening degree of the electronic expansion valve according to the temperature of the second outdoor heat exchanger, so that the temperature of the second outdoor heat exchanger is reduced to a third set temperature;
and keeping the opening degree of the electronic expansion valve when the temperature of the second outdoor heat exchanger is reduced to a third set temperature, and continuously frosting the surface of the second outdoor heat exchanger until the second defrosting condition is met.
6. The control method according to claim 5,
the second frost removal condition includes: the temperature of the second outdoor heat exchanger is reduced to a fourth set temperature or the time for maintaining the opening degree of the electronic expansion valve exceeds a second set time, and the fourth set temperature is lower than the third set temperature.
7. The control method according to claim 1 or 2, wherein in causing the second outdoor heat exchanger to release heat, further comprising:
detecting a temperature of the second outdoor heat exchanger;
and determining that the self-cleaning of the second outdoor heat exchanger is finished after the temperature of the second outdoor heat exchanger reaches a preset second defrosting cut-off temperature.
8. An air conditioner comprises a refrigeration system and a self-cleaning controller, wherein
The refrigeration system includes: indoor set heat transfer subassembly, refrigerant flow direction auto-change over device, compressor, off-premises station heat transfer subassembly and throttling arrangement that are connected in series in proper order by the refrigerant pipeline, wherein the off-premises station heat transfer subassembly includes: the first outdoor heat exchanger and the second outdoor heat exchanger are connected in series, the second outdoor heat exchanger is connected to the compressor through the refrigerant flow direction switching device, and an electronic expansion valve is arranged between the first outdoor heat exchanger and the second outdoor heat exchanger;
the self-cleaning controller is electrically connected with the refrigeration system and is configured to: receiving a trigger signal for starting a self-cleaning function of the air conditioner; adjusting the refrigerant flow direction switching device to a state that the compressor provides compressed refrigerant for the indoor unit heat exchange assembly; adjusting the opening degree of the electronic expansion valve to continuously frost the surface of the first outdoor heat exchanger; after a preset first defrosting condition is met, switching the refrigerant flow direction switching device to change the refrigerant flow direction, so that the first outdoor heat exchanger releases heat to defrost, and carrying out self-cleaning on the first outdoor heat exchanger by utilizing water formed by defrosting to remove attached pollutants; and continuously frosting the surface of the second outdoor heat exchanger by adjusting the opening degree of the electronic expansion valve until a preset second defrosting condition is met, opening the opening degree of the electronic expansion valve to the maximum, releasing heat of the second outdoor heat exchanger, and taking away attached pollutants by using water formed by defrosting to realize self-cleaning of the second outdoor heat exchanger so as to defrost.
9. The air conditioner of claim 8, wherein the self-cleaning controller is further configured to:
detecting a temperature of the first outdoor heat exchanger;
reducing the opening degree of the electronic expansion valve according to the temperature of the first outdoor heat exchanger, so that the temperature of the first outdoor heat exchanger is reduced to a first set temperature;
keeping the opening degree of the electronic expansion valve when the temperature of the first outdoor heat exchanger is reduced to a first set temperature, and continuously frosting the surface of the first outdoor heat exchanger until the first defrosting condition is met, wherein the first defrosting condition comprises the following steps: the temperature of the first outdoor heat exchanger is reduced to a second set temperature or the time for maintaining the opening degree of the electronic expansion valve exceeds a first set time, and the second set temperature is lower than the first set temperature;
and determining that the self-cleaning of the first outdoor heat exchanger is finished after the temperature of the first outdoor heat exchanger reaches a preset first defrosting cut-off temperature.
10. The air conditioner of claim 8, wherein the self-cleaning controller is further configured to:
detecting a temperature of the second outdoor heat exchanger;
adjusting the opening degree of the electronic expansion valve according to the temperature of the second outdoor heat exchanger, so that the temperature of the second outdoor heat exchanger is reduced to a third set temperature;
keeping the opening degree of the electronic expansion valve when the temperature of the second outdoor heat exchanger is reduced to a third set temperature, and continuously frosting the surface of the second outdoor heat exchanger until the second frosting condition is met, wherein the second frosting condition comprises the following steps: the temperature of the second outdoor heat exchanger is reduced to a fourth set temperature or the time for maintaining the opening degree of the electronic expansion valve exceeds a second set time, and the fourth set temperature is lower than the third set temperature;
and determining that the self-cleaning of the second outdoor heat exchanger is finished after the temperature of the second outdoor heat exchanger reaches a preset second defrosting cut-off temperature.
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| CN201710641148.7A CN107525220B (en) | 2017-07-31 | 2017-07-31 | Air conditioner and outdoor unit self-cleaning control method thereof |
| PCT/CN2018/096849 WO2019024721A1 (en) | 2017-07-31 | 2018-07-24 | Air conditioner and self-cleaning control method for outdoor unit thereof |
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| CN201710641148.7A CN107525220B (en) | 2017-07-31 | 2017-07-31 | Air conditioner and outdoor unit self-cleaning control method thereof |
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| CN107525220B (en) * | 2017-07-31 | 2020-11-27 | 青岛海尔空调器有限总公司 | Air conditioner and outdoor unit self-cleaning control method thereof |
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| CN108758961B (en) * | 2018-04-17 | 2021-02-02 | 青岛海信日立空调系统有限公司 | Dust removal method and device for outdoor unit of air conditioner |
| CN110749096B (en) * | 2018-07-23 | 2022-07-19 | 青岛海尔新能源电器有限公司 | Self-cleaning method and heat pump water heater |
| JP6704491B1 (en) * | 2019-07-03 | 2020-06-03 | 日立ジョンソンコントロールズ空調株式会社 | Air conditioner |
| CN110398038A (en) * | 2019-07-29 | 2019-11-01 | 宁波奥克斯电气股份有限公司 | A kind of outdoor machine of air-conditioner self-cleaning control method, device and air-conditioning system |
| JP6749507B1 (en) * | 2019-08-30 | 2020-09-02 | 日立ジョンソンコントロールズ空調株式会社 | Air conditioner |
| JP7078856B2 (en) * | 2019-09-02 | 2022-06-01 | ダイキン工業株式会社 | Air conditioning system |
| CN112524746B (en) * | 2019-09-17 | 2021-11-26 | 青岛海尔空调电子有限公司 | Control method for outdoor unit balanced frosting in multi-split air conditioning system |
| KR20210113151A (en) * | 2020-03-05 | 2021-09-15 | 히타치 존슨 컨트롤즈 쿠쵸 가부시키가이샤 | air conditioner |
| KR102481685B1 (en) * | 2020-03-05 | 2022-12-28 | 히타치 존슨 컨트롤즈 쿠쵸 가부시키가이샤 | air conditioner |
| CN111380153B (en) * | 2020-03-27 | 2021-06-22 | 广东美的制冷设备有限公司 | High-temperature sterilization control method and device, air conditioner and storage medium |
| CN112833594A (en) * | 2020-08-27 | 2021-05-25 | 青岛海尔新能源电器有限公司 | Self-cleaning control method of heat pump water heater and heat pump water heater |
| JP7116335B2 (en) * | 2020-08-28 | 2022-08-10 | ダイキン工業株式会社 | indoor air conditioning system |
| CN112254275A (en) * | 2020-10-12 | 2021-01-22 | 海信（山东）空调有限公司 | Self-cleaning control method for outdoor unit of air conditioner |
| CN112902473A (en) * | 2021-03-25 | 2021-06-04 | 珠海格力电器股份有限公司 | Air conditioner heat exchange structure, air conditioner external unit, air conditioner system and air conditioner system control method |
| CN112902478A (en) * | 2021-03-25 | 2021-06-04 | 珠海格力电器股份有限公司 | Air conditioner heat exchange structure, air conditioner external unit, air conditioner system and air conditioner system control method |
| CN112902479A (en) * | 2021-03-25 | 2021-06-04 | 珠海格力电器股份有限公司 | Air conditioner heat exchange structure, air conditioner system, control method of air conditioner system and air conditioner outdoor unit |
| CN113251573B (en) * | 2021-04-15 | 2022-10-28 | 青岛海尔空调器有限总公司 | Control method for self-cleaning of double-evaporator air conditioner and double-evaporator air conditioner |
| CN113959192B (en) * | 2021-10-15 | 2023-03-31 | 青岛海尔空调电子有限公司 | Method and device for self-cleaning of heat pump dryer, heat pump dryer and storage medium |
| CN114251807B (en) * | 2021-12-01 | 2023-04-11 | 海信（广东）空调有限公司 | Self-cleaning control method of air conditioner, air conditioner and computer readable storage medium |
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| WO2019024721A1 (en) | 2019-02-07 |
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