WO2019024721A1

WO2019024721A1 - Air conditioner and self-cleaning control method for outdoor unit thereof

Info

Publication number: WO2019024721A1
Application number: PCT/CN2018/096849
Authority: WO
Inventors: 刘超超; 杨中锋; 袁俊军
Original assignee: 青岛海尔空调器有限总公司
Priority date: 2017-07-31
Filing date: 2018-07-24
Publication date: 2019-02-07
Also published as: CN107525220A; CN107525220B

Abstract

An air conditioner (10) and a self-cleaning control method for an outdoor unit (200) thereof. An outdoor unit heat exchange assembly (210) comprises: a first outdoor heat exchanger (211) and a second outdoor heat exchanger (212) connected in series; the first outdoor heat exchanger (211) is connected to a compressor (250) by means of a refrigerant flow direction switching device (260); an electronic expansion valve (230) is provided between the first outdoor heat exchanger (211) and the second outdoor heat exchanger (212). Moreover, the control method comprises: a self-cleaning controller (150) adjusts the refrigerant flow direction switching device (260) to a state in which a compressed refrigerant is provided to an indoor unit heat exchange assembly (110), adjusts the opening degree of the electronic expansion valve (230) so that frosting is continued on the surface of the first outdoor heat exchanger (211), switches the refrigerant flow direction switching device (260) after a preset first defrosting condition is met, so that the flow direction of the refrigerant is reversed, and removes attached contaminants with water formed by defrosting to implement self-cleaning of the first outdoor heat exchanger (211); the self-cleaning controller (150) continues adjusting the opening degree of the electronic expansion valve (230) so that the frosting is continued on the surface of the second outdoor heat exchanger (212), adjusts the opening degree of the electronic expansion valve (230) to the maximum after a preset second defrosting condition is met, so that the second outdoor heat exchanger (212) releases heat, and removes the attached contaminants with water formed by defrosting to implement self-cleaning of the second outdoor heat exchanger (212).

Description

Air conditioner and outdoor unit self-cleaning control method thereof

Technical field

The invention relates to a household air conditioner, in particular to an air conditioner and a self-cleaning control method thereof.

Background technique

After the air conditioner is placed or used for a long time, the outdoor opportunity accumulates a large amount of dust. These dusts adhere to the heat exchanger of the outdoor unit, which on the one hand will reduce the heat exchange performance of the heat exchanger, resulting in a decrease in the performance of the air conditioner, resulting in an increase in energy consumption.

Conventional air conditioners generally adopt small airframe maintenance, and generally rely on condensed water or environmental wind and rain for cleaning. This method is difficult to ensure the cleaning effect of the outdoor unit. The long-term operation causes the heat exchange efficiency of the outdoor unit to be greatly reduced.

Summary of the 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 component.

Another further object of the present invention is to avoid violent fluctuations in the operating temperature of the indoor unit during the cleaning of the outdoor unitized heat assembly, which affects the user experience.

According to an aspect of the present invention, an outdoor unit self-cleaning control method for an air conditioner is provided, wherein the refrigeration system of the air conditioner includes an indoor unit heat exchange assembly sequentially connected by a refrigerant line, a refrigerant flow direction switching device, and compression The machine, the outdoor unit heat exchange component, and the throttling device, wherein the outdoor unit heat exchange component comprises: a first outdoor heat exchanger connected in series and a second outdoor heat exchanger, wherein the first outdoor heat exchanger is switched by the refrigerant flow direction The device is connected to the compressor, an electronic expansion valve is disposed between the first outdoor heat exchanger and the second outdoor heat exchanger, and the control method comprises: receiving a trigger signal for the air conditioner to open the self-cleaning function; adjusting the refrigerant flow to the switching device Providing a state in which the compressor supplies compressed refrigerant to the indoor unit heat exchange component; adjusting the opening degree of the electronic expansion valve to continuously frost the surface of the first outdoor heat exchanger; and switching after satisfying the preset first defrosting condition The refrigerant flows to the switching device to cause the refrigerant to flow in a direction of reversal, so that the first outdoor heat exchanger releases heat to perform defrosting, and the water formed by the defrosting is carried away. Contaminant, self-cleaning of the first outdoor heat exchanger; by adjusting the opening of the electronic expansion valve, the surface of the second outdoor heat exchanger continues to frost, until the preset second defrosting condition is met, the electron is made The opening of the expansion valve is opened to the maximum, so that the second outdoor heat exchanger releases heat, and the water formed by the defrosting is used to take away the attached pollutants, thereby realizing the self-cleaning of the second outdoor heat exchanger.

Optionally, the step of adjusting the opening of the electronic expansion valve such that the surface of the first outdoor heat exchanger continues to frost comprises: detecting the temperature of the first outdoor heat exchanger; and reducing the electron according to the temperature of the first outdoor heat exchanger The opening degree of the expansion valve causes the temperature of the first outdoor heat exchanger to drop to a first set temperature; maintaining the opening degree of the electronic expansion valve when the temperature of the first outdoor heat exchanger drops to the first set temperature, so that the first The surface of the outdoor heat exchanger continues to frost until the first defrosting condition is met.

Optionally, the first defrosting condition comprises: the temperature of the first outdoor heat exchanger is decreased to the second set temperature or the opening of the electronic expansion valve is maintained for more than the first set time, and the second set temperature is lower than The first set temperature.

Optionally, in the process of causing the first outdoor heat exchanger to release heat, the method further includes: detecting a temperature of the first outdoor heat exchanger; after the temperature of the first outdoor heat exchanger reaches a preset first defrosting cutoff temperature , determining that the self-cleaning of the first outdoor heat exchanger is completed.

Optionally, the step of continuing the frosting of 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 electron according to the temperature of the second outdoor heat exchanger The opening degree of the expansion valve causes the temperature of the second outdoor heat exchanger to drop to a third set temperature; maintaining the opening degree of the electronic expansion valve when the temperature of the second outdoor heat exchanger drops to the third set temperature, so that the second The surface of the outdoor heat exchanger continues to frost until the second defrosting condition is met.

Optionally, the second defrosting condition comprises: the temperature of the second outdoor heat exchanger drops to a fourth set temperature or the opening of the electronic expansion valve is maintained for more than a second set time, and the fourth set temperature is lower than The third set temperature.

Optionally, in the process of causing the second outdoor heat exchanger to release heat, the method further includes: detecting a temperature of the second outdoor heat exchanger; after the temperature of the second outdoor heat exchanger reaches a preset second defrosting cutoff temperature , determining that the self-cleaning of the second outdoor heat exchanger is completed.

According to another aspect of the present invention, there is also provided an air conditioner comprising a refrigeration system and a self-cleaning controller, wherein the refrigeration system comprises: an indoor unit heat exchange component serially connected by a refrigerant pipeline, and a refrigerant flow direction switching The device, the compressor, the outdoor unit heat exchange component, and the throttling device, wherein the outdoor unit heat exchange assembly comprises: a first outdoor heat exchanger connected in series and a second outdoor heat exchanger, wherein the second outdoor heat exchanger passes the refrigeration The agent flow switching device is connected to the compressor, and the electronic expansion valve is disposed between the first outdoor heat exchanger and the second outdoor heat exchanger; the self-cleaning controller is electrically connected to the refrigeration system and configured to: receive the air conditioner to open from a trigger signal for the cleaning function; adjusting the flow of the refrigerant to the switching device to a state in which the compressor supplies the compressed refrigerant to the indoor heat exchange component; adjusting the opening of the electronic expansion valve to continuously frost the surface of the first outdoor heat exchanger; After the preset first defrosting condition is satisfied, the refrigerant flows to the switching device to cause the refrigerant to flow to the opposite direction, so that the first outdoor heat exchanger releases heat for performing Frost, using the water formed by the defrosting to remove the attached contaminants to achieve self-cleaning of the first outdoor heat exchanger; by adjusting the opening of the electronic expansion valve, the surface of the second outdoor heat exchanger continues to frost until it is satisfied After the preset second defrosting condition, the opening of the electronic expansion valve is opened to the maximum, so that the second outdoor heat exchanger releases heat, and the water formed by the defrosting is used to take away the attached pollutants to realize the second outdoor heat exchange. Self-cleaning of the device for defrosting.

Optionally, the self-cleaning controller is further configured to: detect a temperature of the first outdoor heat exchanger; reduce an opening of the electronic expansion valve according to a temperature of the first outdoor heat exchanger, so that a temperature of the first outdoor heat exchanger decreases Up to the first set temperature; maintaining the opening degree of the electronic expansion valve when the temperature of the first outdoor heat exchanger drops to the first set temperature, so that the surface of the first outdoor heat exchanger is continuously frosted until the first defrosting condition is satisfied The first defrosting condition includes: the temperature of the first outdoor heat exchanger drops to the second set temperature or the opening of the electronic expansion valve is maintained for more than the first set time, and the second set temperature is lower than the first set The temperature is determined; after the temperature of the first outdoor heat exchanger reaches a preset first defrosting cutoff temperature, the self-cleaning of the first outdoor heat exchanger is determined to be completed.

Optionally, the self-cleaning controller is further configured to: detect a temperature of the second outdoor heat exchanger; adjust an opening of the electronic expansion valve according to a temperature of the second outdoor heat exchanger, so that a temperature of the second outdoor heat exchanger is lowered to a third set temperature; maintaining the opening degree of the electronic expansion valve when the temperature of the second outdoor heat exchanger drops to the third set temperature, so that the surface of the second outdoor heat exchanger is continuously frosted until the second defrosting condition is satisfied, The second defrosting condition includes: the temperature of the second outdoor heat exchanger drops to the fourth set temperature or the opening of the electronic expansion valve is maintained for more than the second set time, and the fourth set temperature is lower than the third set Temperature; after the temperature of the second outdoor heat exchanger reaches a preset second defrosting cutoff temperature, determining that the self-cleaning of the second outdoor heat exchanger is completed.

The air conditioner and the outdoor unit self-cleaning control method thereof are particularly suitable for the air conditioner operating in a heating state, and the structure of the outdoor unit heat exchange component is improved, and the first outdoor heat exchanger connected in series is arranged a second outdoor heat exchanger, and an electronic expansion valve is added between the first outdoor heat exchanger and the second outdoor heat exchanger, and the first outdoor exchange is respectively performed by adjusting the flow direction of the refrigerant and the opening degree of the electronic expansion valve The heat exchanger and the second outdoor heat exchanger respectively perform a self-cleaning process, which can clean the outdoor heat exchanger, improve the heat exchange efficiency, and also reduce the influence of the normal heating of the indoor unit and prevent the temperature from appearing. The violent fluctuations bring a better user experience.

Further, the air conditioner of the present invention and the outdoor unit self-cleaning control method thereof optimize the self-cleaning process of the first outdoor heat exchanger and the second outdoor heat exchanger, which takes less time and has a self-cleaning effect. it is good.

The above as well as other objects, advantages and features of the present invention will become apparent to those skilled in the <

DRAWINGS

Some specific embodiments of the present invention will be described in detail, by way of example, and not limitation, The same reference numbers in the drawings identify the same or similar parts. Those skilled in the art should understand that the drawings are not necessarily drawn to scale. In the figure:

1 is a schematic functional block diagram of an air conditioner according to an embodiment of the present invention;

2 is a schematic diagram of a refrigeration system of an air conditioner according to an embodiment of the present invention;

3 is a schematic diagram of an outdoor unit self-cleaning control method of an air conditioner according to an embodiment of the present invention;

4 is a flow chart for realizing 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;

5 is a flow chart for realizing 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;

6 is a flow chart showing a specific implementation of an outdoor unit self-cleaning control method for an air conditioner according to an embodiment of the present invention.

Detailed ways

1 is a schematic functional block diagram of an air conditioner 10 in accordance with one embodiment of the present invention. 2 is a schematic diagram of a refrigeration system of an air conditioner 10 in accordance with one embodiment of the present invention.

The air conditioner 10 may generally include an air conditioner indoor unit 100 and an air conditioner outdoor unit 200. The air conditioner indoor unit 100 and the air conditioner outdoor unit 200 complete an air conditioning refrigeration and heating cycle through an effective cooperative operation, thereby realizing a living room. The internal temperature is regulated by heat and cold. The refrigeration system of the air conditioner 10 can be realized by a compression refrigeration cycle that utilizes a compression phase change cycle of the refrigerant in the compressor 250, the condenser, the evaporator, and the throttle device 240 to achieve heat transfer. The refrigeration system can also set the refrigerant flow to the switching device 260 to change the flow direction of the refrigerant, so that the indoor unit heat exchange assembly 110 alternately functions as an evaporator or a condenser, and the outdoor unit heat exchange unit 210 alternately functions as a condenser or an evaporator. For the cooling or heating function, the refrigerant flow direction switching device 260 is generally implemented by a four-way valve.

The working principle of the compression refrigeration cycle is: the compressor 250 is the power of the refrigeration cycle, which is driven by the motor to rotate without stopping. In addition to timely withdrawing the vapor in the evaporator, maintaining the low temperature and low pressure, the refrigerant vapor is also increased by the compression action. The pressure and temperature create conditions that transfer the heat of the refrigerant vapor to the ambient medium. The low temperature and low pressure refrigerant vapor is compressed to a high temperature and high pressure state.

The condenser is a heat exchange device, which uses the environment to cool the refrigerant, removes the heat of the high-temperature high-pressure refrigerant vapor from the compressor 250, and cools and condenses the high-temperature high-pressure refrigerant vapor into a high-pressure normal temperature refrigerant liquid.

The high-pressure normal temperature refrigerant liquid is directly sent to the evaporator, and according to the saturation pressure and the saturation temperature-corresponding principle, the pressure of the refrigerant liquid is lowered, thereby lowering the temperature of the refrigerant liquid. The high-pressure normal temperature refrigerant liquid is passed through the throttling device 240 to obtain a low-temperature low-pressure refrigerant, which is then sent to the evaporator for absorption by heat. A capillary tube can generally be used as the throttle device 240 in the air conditioner 10.

The evaporator is also a heat exchange device. The low-temperature and low-pressure refrigerant liquid after the throttling evaporates (boiling) into vapor, absorbs the surrounding heat, and lowers the ambient temperature.

The refrigerant flow direction switching device 260 is configured to switch the flow direction of the refrigerant in the compression refrigeration cycle. For example, during the heating process of the air conditioner 10, the compressor 250 supplies the compressed refrigerant to the indoor unit heat exchange assembly 110, and the indoor unit heat exchange assembly 110 As a condenser, the refrigerant is condensed by the indoor unit heat exchange unit 110, sent to the outdoor unit heat exchange unit 210 through the throttle unit 240, and the outdoor unit heat exchange unit 210 absorbs external heat, and then the refrigerant is re-sent to the compressor. 250. During the refrigeration of the air conditioner 10, the compressor 250 supplies compressed refrigerant to the outdoor unit heat exchange unit 210, and the outdoor unit heat exchange unit 210 serves as a condenser. After the refrigerant passes through the outdoor unit heat exchange unit 210, the refrigerant is throttled. The device 240 is sent to the indoor unit heat exchange unit 110. The indoor unit heat exchange unit 110 absorbs external heat, cools the surrounding air, and cools and dehumidifies the air, and then re-feeds the refrigerant into the compressor 250.

Further, the indoor unit fan 120 and the outdoor unit fan 220 in the refrigeration system respectively generate an air flow for exchanging heat with the indoor unit heat exchange unit 110 and the outdoor unit heat exchange unit 210.

Since the air conditioner 10 accumulates dust on the indoor unit heat exchange unit 110 and the outdoor unit heat exchange unit 210 during use, the air conditioner 10 becomes a potential source of pollution in the environment. The self-cleaning technology that appears in the prior art is generally directed to the indoor unit heat exchange assembly 110, and there is no special cleaning means for the outdoor unit heat exchange unit 120, but the long-term accumulation of dust necessarily leads to the replacement of the outdoor unit heat exchange unit 210. The thermal efficiency is degraded, which has not received sufficient attention in the prior art.

The air conditioner 10 of the present embodiment adopts the following structural improvement for the above problem: the outdoor unit 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 The 211 is connected to the compressor 250 through the refrigerant flow 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 connected to the indoor unit heat exchange assembly 110 through the throttle device 240. The electronic expansion valve 230 is kept open during normal operation without affecting cooling or heating. During the self-cleaning process, the opening of the electronic expansion valve 230 can be controlled.

The air conditioner 10 of the embodiment is further provided with a self-cleaning controller 150, which can be realized by the original control panel of the air conditioner 10 by configuring a self-cleaning control program or by preset self-cleaning control logic, The hardware configuration of the self-cleaning controller 150 itself is well known to those skilled in the art and will not be described herein.

The process of self-cleaning control by the self-cleaning controller 150 is: receiving a trigger signal for the air conditioner 10 to turn on the self-cleaning function (for example, receiving a self-cleaning control command issued by the user through the remote controller or the human-machine interaction interface of the air conditioner 10, or an air conditioner) The device 10 determines a trigger command generated by self-cleaning according to the working state thereof; and after the receiving the trigger signal, adjusts the flow of the refrigerant to the switching device 260 to the state in which the compressor 250 supplies the compressed refrigerant to the indoor unit heat exchange assembly 110. (that is, switching to the heating state of the air conditioner 10, if it is already in the heating state, maintaining the state); by adjusting the opening degree of the electronic expansion valve 230, the surface of the first outdoor heat exchanger 211 is continuously frosted. Thereby, water sufficient to flush the first outdoor heat exchanger 211 is accumulated. After the preset first defrosting condition is satisfied, the refrigerant flows to the switching device 260 to cause the refrigerant to flow to the opposite direction, so that the first outdoor heat exchanger releases heat to perform defrosting, and the water formed by the defrosting is taken away. The attached contaminants enable self-cleaning of the first outdoor heat exchanger.

The self-cleaning controller 150 continues to adjust the opening of the electronic expansion valve 230 such that the surface of the second outdoor heat exchanger 212 continues to frost, after the refrigerant flows to the switching device 260, due to the throttling effect of the electronic expansion valve 230, The second outdoor heat exchanger 212 serves as a main evaporator, so that temperature fluctuations of the indoor unit heat exchange unit 110 can be reduced. After the preset second defrosting condition is satisfied, 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 the defrosting is used to take away the attached pollutants, thereby realizing the first The two outdoor heat exchangers 212 are self-cleaning for defrosting.

Through the above-mentioned segmented cleaning process, the influence on the indoor unit heat exchange unit 110 can be reduced during the cleaning process, and the temperature fluctuation of the working environment can be avoided.

The self-cleaning controller 150 adjusts the opening degree of the electronic expansion valve 230 such that the surface of the first outdoor heat exchanger 211 continues to be frosted, specifically: detecting the temperature of the first outdoor heat exchanger 211 (for example, the first outdoor heat exchanger) 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 lowered to the first set temperature; maintaining the first outdoor heat exchange The temperature of the electronic expansion valve 230 is lowered to the first set temperature, and the surface of the first outdoor heat exchanger 211 is continuously frosted until the set first defrosting condition is satisfied; After the condition, the refrigerant flows to the switching device 260 to cause the refrigerant to flow in the direction of reversal, so that the first outdoor heat exchanger 211 releases heat to perform defrosting, and the water formed by the defrosting carries away the attached contaminants, thereby realizing the said 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 the second set temperature or the opening of the electronic expansion valve 230 is maintained for more than the first set time, and the second set temperature is lower than the first set time A set temperature. After the first defrosting condition described above is satisfied, it can be considered that the first heat exchanger has been frosted. And during the frosting of the first heat exchanger, the compressor 250 can maintain its inconvenient operating frequency and turn off the indoor unit fan 120 and the outdoor unit fan 220.

After determining that the first defrosting condition is reached, the self-cleaning controller 150 causes the first outdoor heat exchanger 211 to release heat, so that the first outdoor heat exchanger 211 is operated in a condenser state, thereby releasing heat for defrosting. The self-cleaning of the first outdoor heat exchanger 211 is achieved by using the water formed by the defrosting to remove the attached contaminants. The self-cleaning controller 150 determines that the first outdoor heat exchanger 211 is determined after the temperature of the first outdoor heat exchanger 211 reaches a preset first defrosting cut-off temperature during the release of heat from the first outdoor heat exchanger 211. The self-cleaning is done.

After adjusting the opening degree, the electronic expansion valve 230 can achieve a throttling effect. In the above process, the second outdoor heat exchanger 212 can maintain the cooling state and still operate as an evaporator, effectively reducing the pair of indoor unit heat exchange components 110. The influence of the surrounding environment avoids the uncomfortable feeling of outputting cold air to the user.

The self-cleaning controller 150 may further perform the self-cleaning process of the second outdoor heat exchanger 212 after completing the self-cleaning process of the first outdoor heat exchanger 211, that is, by adjusting the opening degree of the electronic expansion valve 230, so that The surface of the outdoor heat exchanger 212 continues to frost until the predetermined second defrosting condition is satisfied, the opening of the electronic expansion valve 230 is opened to the maximum, and the second outdoor heat exchanger 212 releases heat, and the defrosting is utilized. The formed water carries away the attached contaminants and achieves self-cleaning of the second outdoor heat exchanger for defrosting. The second defrosting condition includes: the temperature of the second outdoor heat exchanger 212 drops to the fourth set temperature or the opening of the electronic expansion valve 230 is maintained for more than 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 throttling effect is realized by the electronic expansion valve 230, so that the second outdoor heat exchange is performed. The device 212 continues to frost, accumulates enough water to be cleaned, and then opens the electronic expansion valve 230 to rapidly defrost for self-cleaning purposes. The self-cleaning controller 150 determines that the second outdoor heat exchanger 212 is determined after the temperature of the second outdoor heat exchanger 212 reaches a preset second defrosting cut-off temperature during the release of heat from the second outdoor heat exchanger 212. The self-cleaning is done.

In the self-cleaning process, the first set temperature, the second set temperature, the third set temperature, the fourth set temperature, the first defrosting cutoff temperature, and the second defrosting cutoff temperature may all be according to the air conditioner 10 The actual specifications and the operating environment are tested. For example, the first set temperature and the third set temperature can be set to -5 ° C, and the second set temperature and the fourth set temperature can be set to -15 ° C (the above values) In the case where both indoor and outdoor are 30 ° C, the results obtained by testing a specific air conditioner can be adjusted within a certain range according to the situation in the specific implementation). The first set time and the second set time may also be set correspondingly, so that the first outdoor heat exchanger 211 or the second outdoor heat exchanger 212 cannot reach the second set temperature and the fourth under special working conditions. set temperature. The first defrosting cutoff temperature and the second defrosting cutoff temperature may be determined according to the heat exchange process of the first outdoor heat exchanger 211 and the second outdoor heat exchanger 212, for example, 50 ° C may be set. After the self-cleaning is completed, the outdoor unit fan 220 can be blown to dry the outdoor unit heat exchanger assembly 210.

The self-cleaning process needs to switch the flow path of the refrigerant and start and stop the compressor 250, which may bring additional energy consumption. Therefore, after receiving the trigger signal of the self-cleaning function of the air conditioner 10, the self-cleaning controller 150 may First, measuring the working environment temperature of the air conditioner indoor unit 100; when the working environment temperature is greater than the fifth set temperature, placing the electronic expansion valve 130 in a controlled state; and maintaining the electronic when the working environment temperature is lower than the fifth set temperature The initial opening state of the expansion valve 230 is performed, 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 ° C, it is considered that the outdoor unit heat exchange unit 210 can be self-cleaned in an environment lower than 26 ° C. If the ambient temperature is higher than 26 ° C, the self-cleaning process of the first outdoor heat exchanger 211 and the second outdoor heat exchanger 212 described above may be performed. It should be noted that the fifth set temperature is set to 26 ° C. For example, when the embodiment is specifically implemented, the fifth set temperature can be set according to the actual experience of the user.

The embodiment of the present invention further provides a self-cleaning control method for the outdoor unit 200 of the air conditioner 10, wherein the outdoor unit 100 self-cleaning control method of the air conditioner 10 is used for self-cleaning control of the air conditioner 10 in the above embodiment, and It can be performed by the self-cleaning controller 150 in the above embodiment. FIG. 3 is a schematic diagram of a self-cleaning control method of the outdoor unit 200 of the air conditioner 10 according to an embodiment of the present invention, and the outdoor unit 200 of the air conditioner 10 is self-cleaning control. The method can generally include:

Step S302, receiving a trigger signal that the air conditioner 10 turns on the self-cleaning function, for example, receiving a self-cleaning control command issued by the user through the remote controller or the human-machine interaction interface of the air conditioner 10, or determining that the air conditioner 10 needs to perform according to its working state. Trigger command generated by cleaning.

Step S304, adjusting the flow of the refrigerant to the switching device until the compressor 250 supplies the compressed refrigerant to the indoor unit heat exchange unit 110, that is, switching to the heating state of the air conditioner 10, and if it is already in the heating state, maintaining the status;

Step S306, the surface of the first outdoor heat exchanger 211 is continuously frosted by adjusting the opening degree of the electronic expansion valve 230;

Step S308, after satisfying the preset first defrosting condition, switching the refrigerant flow to the switching device 260 to reversing the flow of the refrigerant, so that the first outdoor heat exchanger 211 releases heat to perform defrosting, and the defrosting is formed. The water carries away the attached contaminants to achieve self-cleaning of the first outdoor heat exchanger 211;

Step S310, the surface of the second outdoor heat exchanger 212 continues to be frosted by adjusting the opening degree of the electronic expansion valve 230;

Step S312, after the preset second defrosting condition is satisfied, 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 the defrosting removes the attached pollution. The self-cleaning of the second outdoor heat exchanger 212 is performed to perform defrosting.

FIG. 4 is a flowchart of self-cleaning of the first outdoor heat exchanger 211 in the outdoor unit 200 self-cleaning control method of the air conditioner 10 according to an embodiment of the present invention. The flow specifically includes:

In step S402, detecting the temperature of the first outdoor heat exchanger 211 can be obtained, for example, by acquiring 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 lowered to the 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 drops to the first set temperature, so that the surface of the first outdoor heat exchanger 211 continues to frost until the first set is satisfied. The frost condition, the first defrosting condition includes: the temperature of the first outdoor heat exchanger 211 is lowered to the second set temperature or the opening of the electronic expansion valve 230 is maintained for more than the first set time, and the second set temperature is low At the first set temperature.

In step S408, after the first defrosting condition is satisfied, the refrigerant is caused to flow in the direction of reversal, and the first outdoor heat exchanger 211 releases heat to perform defrosting.

Step S410, after the temperature of the first outdoor heat exchanger 211 reaches a preset first defrosting cutoff temperature, determining that the self-cleaning of the first outdoor heat exchanger 211 is completed.

After the self-cleaning of the first outdoor heat exchanger 211, the outdoor unit 200 self-cleaning control method of the air conditioner 10 of the present embodiment may further perform self-cleaning of the second outdoor heat exchanger 212. 5 is a flow chart for implementing self-cleaning of the second outdoor heat exchanger 212 in the outdoor unit 200 self-cleaning control method of the air conditioner 10 according to an embodiment of the present invention. 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 lowered to a third set temperature;

Step S506, maintaining the opening degree of the electronic expansion valve 230 when the temperature of the second outdoor heat exchanger 212 drops to the third set temperature, so that the surface of the second outdoor heat exchanger 212 continues to frost until the second defrosting condition is satisfied;

Step S508, after the second defrosting condition is satisfied, the opening degree of the electronic expansion valve 230 is opened to the maximum, so that the second outdoor heat exchanger 212 releases heat;

Step S510, after the temperature of the second outdoor heat exchanger 212 reaches the preset second defrosting cutoff temperature, determining that the self-cleaning of the second outdoor heat exchanger 212 is completed.

The first set temperature and the third set temperature are set to -5 ° C, the second set temperature and the fourth set temperature are set to -15 ° C, the defrosting temperature is set to 50 ° C, the first set time and The second set time is set to 10 minutes, the first defrosting cutoff temperature, the second defrosting cutoff temperature is set to 50 ° C, and the fifth set temperature is set to 26 ° C as an example. The process of completing the entire outdoor unit heat exchange assembly 210 is described. FIG. 6 is a flowchart of a specific implementation of the outdoor unit 200 self-cleaning control method of the air conditioner 10 according to an embodiment of the present invention. The process includes:

Step S602, receiving a trigger signal for the air conditioner 10 to turn on the self-cleaning function during the heating process of the air conditioner 10;

Step S604, the ambient temperature of the working environment of the indoor unit 100 is obtained, and it is determined whether the ambient temperature is higher than 26 ° C. If it is lower than 26 ° C, step S640 is performed to perform an overall self-cleaning process of the outdoor unit heat exchange component 210;

Step S606, when the ambient temperature is higher than 26 ° C, the refrigerant flow is adjusted to the switching device until the compressor 250 supplies the compressed refrigerant to the indoor unit heat exchange assembly 110, that is, the heating state of the air conditioner 10 is maintained;

In step S608, the indoor unit fan 120 and the outdoor unit fan 220 are stopped, and the compressor 250 is operated at a preset target frequency (the preset target frequency is selected according to the indoor and outdoor temperature, for example, under the condition of 30 ° C indoors and outdoors, it can be set to 50Hz);

Step S610, detecting the coil temperature TP1 of the first outdoor heat exchanger 211, reducing the opening degree of the electronic expansion valve 230, so that TP1 gradually drops to -5 ° C;

Step S612, maintaining the opening degree of the electronic expansion valve 230 when the TP1 is lowered to -5 ° C, so that the surface of the first outdoor heat exchanger 211 is continuously frosted;

Step S614, determining whether TP1 drops to -15 ° C;

Step S616, determining that the opening degree of the electronic expansion valve 230 is maintained for more than 10 minutes;

In step S618, when either of the conditions of TP1 falling to -15 ° C and the opening continuous holding time exceeding 10 minutes is satisfied, the refrigerant flow is reversed to the switching device (four-way valve) 260, so that the first outdoor heat exchanger 211 releases heat. To perform defrosting, using the water formed by the defrosting to remove the attached contaminants, thereby achieving self-cleaning of the first outdoor heat exchanger 211;

Step S620, determining whether TP1 reaches the first defrosting cutoff temperature of 50 ° C;

Step S622, the first outdoor heat exchanger 211 is 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, so that TP2 gradually drops to -5 ° C;

Step S628, keeping the opening degree of the electronic expansion valve 230 when the TP2 is lowered to -5 ° C, so that the surface of the second outdoor heat exchanger 212 continues to frost;

Step S630, determining whether TP2 drops to -15 ° C;

Step S632, determining that the opening degree of the electronic expansion valve 230 is continuously maintained for more than 10 minutes;

Step S634, when any of the conditions that the TP2 is lowered to -15 ° C and the opening degree is maintained for more than 10 minutes, the opening degree of the electronic expansion valve 230 is opened to the maximum, and the second outdoor heat exchanger 212 is released with heat. The water formed by the defrosting removes the attached contaminants to achieve self-cleaning of the second outdoor heat exchanger 212;

Step S636, determining whether TP2 reaches the second defrosting cutoff temperature setting of 50 ° C;

In step S638, the second outdoor heat exchanger 212 is self-cleaning.

In the process of implementing the foregoing method, the specific determination threshold value may be adjusted according to the specifications, the operating environment, and the user habit of the air conditioner 10. The specific numerical values are merely examples.

In the outdoor unit 200 of the air conditioner 10 of the present embodiment, the first outdoor heat exchanger 211 and the second outdoor heat exchanger 212 respectively perform a self-cleaning process to effectively clean the outdoor unit heat exchange unit 210. The heat exchange efficiency is improved, and the influence on the indoor unit is small, and the temperature fluctuation of the indoor temperature is prevented, which brings a better user experience.

In this regard, it will be appreciated by those skilled in the <RTIgt;the</RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; The content directly determines or derives many other variations or modifications consistent with the principles of the invention. Therefore, the scope of the invention should be understood and construed as covering all such other modifications or modifications.

Claims

The invention relates to an outdoor unit self-cleaning control method for an air conditioner, wherein the refrigeration system of the air conditioner comprises an indoor unit heat exchange component sequentially connected by a refrigerant pipeline, a refrigerant flow direction switching device, a compressor, and an outdoor unit heat exchange component. And a throttling device, wherein the outdoor unit heat exchange assembly comprises: a first outdoor heat exchanger connected in series and a second outdoor heat exchanger, wherein the first outdoor heat exchanger passes through the refrigerant flow to the switching device Connected to the compressor, an electronic expansion valve is disposed between the first outdoor heat exchanger and the second outdoor heat exchanger, and the control method includes:

Receiving a trigger signal that the air conditioner turns on the self-cleaning function;

Adjusting the flow of the refrigerant to the switching device to a state in which the compressor supplies compressed refrigerant to the indoor unit heat exchange component;

Adjusting an opening degree of the electronic expansion valve such that a surface of the first outdoor heat exchanger continues to frost;

After satisfying the preset first defrosting condition, switching the refrigerant flow to the switching device to cause the refrigerant to flow in a direction of reversal, so that the first outdoor heat exchanger releases heat for defrosting and utilizing defrosting Forming water to carry away the attached contaminants to achieve self-cleaning of the first outdoor heat exchanger;

The surface of the second outdoor heat exchanger is continuously frosted by adjusting the opening degree of the electronic expansion valve until the predetermined second defrosting condition is satisfied, and the opening of the electronic expansion valve is opened to the maximum And causing the second outdoor heat exchanger to release heat, and the water formed by the defrosting removes the attached pollutants to realize self-cleaning of the second outdoor heat exchanger.
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 frosting comprises:

Detecting a temperature of the first outdoor heat exchanger;

Decreasing an opening degree of the electronic expansion valve according to a temperature of the first outdoor heat exchanger, so that a temperature of the first outdoor heat exchanger is lowered to a first set temperature;

Maintaining an opening degree of the electronic expansion valve when the temperature of the first outdoor heat exchanger drops to a first set temperature, so that the first outdoor heat exchanger surface continues to frost until the first defrosting is satisfied condition.
The control method according to claim 1 or 2, wherein

The first defrosting condition includes: the temperature of the first outdoor heat exchanger drops to a second set temperature or the opening of the electronic expansion valve is maintained for more than a first set time, the second setting The predetermined temperature is lower than the first set temperature.
The control method according to claim 1 or 2, wherein in the process of causing the first outdoor heat exchanger to release heat, the method further comprises:

Detecting a temperature of the first outdoor heat exchanger;

After the temperature of the first outdoor heat exchanger reaches a preset first defrosting cutoff temperature, determining that the self-cleaning of the first outdoor heat exchanger is completed.
The control method according to claim 1, wherein the step of continuing the frosting of the surface of the second outdoor heat exchanger by adjusting the opening degree of the electronic expansion valve comprises:

Detecting a temperature of the second outdoor heat exchanger;

Adjusting an opening degree of the electronic expansion valve according to a temperature of the second outdoor heat exchanger, so that a temperature of the second outdoor heat exchanger is lowered to a third set temperature;

Maintaining an opening degree of the electronic expansion valve when the temperature of the second outdoor heat exchanger drops to a third set temperature, so that the surface of the second outdoor heat exchanger continues to frost until the second defrosting is satisfied condition.
The control method according to claim 5, wherein

The second defrosting condition includes: the temperature of the second outdoor heat exchanger drops to a fourth set temperature or the opening of the electronic expansion valve is maintained for more than a second set time, the fourth setting The predetermined temperature is lower than the third set temperature.
The control method according to claim 1 or 2, wherein in the process of causing the second outdoor heat exchanger to release heat, the method further comprises:

Detecting a temperature of the second outdoor heat exchanger;

After the temperature of the second outdoor heat exchanger reaches a preset second defrosting cutoff temperature, determining that the self-cleaning of the second outdoor heat exchanger is completed.
An air conditioner including a refrigeration system and a self-cleaning controller, wherein

The refrigeration system includes: an indoor unit heat exchange component sequentially connected in series by a refrigerant pipeline, a refrigerant flow direction switching device, a compressor, an outdoor unit heat exchange component, and a throttle device, wherein the outdoor unit heat exchange component includes a first outdoor heat exchanger connected in series and a second outdoor heat exchanger, wherein the second outdoor heat exchanger is connected to the compressor through the refrigerant flow switching device, the first outdoor heat exchanger And an electronic expansion valve is disposed between the second outdoor heat exchanger;

The self-cleaning controller is electrically connected to the refrigeration system, and configured to: receive a trigger signal that the air conditioner turns on a self-cleaning function; and adjust the refrigerant flow to the switching device to the compressor to the indoor The heat exchange component of the machine provides a state of compressing the refrigerant; adjusting the opening degree of the electronic expansion valve such that the surface of the first outdoor heat exchanger continues to frost; after the preset first defrosting condition is satisfied, the switchover The refrigerant flows to the switching device to cause the refrigerant to flow in a direction of reversal, so that the first outdoor heat exchanger releases heat to perform defrosting, and the water formed by the defrosting removes the attached pollutants to realize the first Self-cleaning of an outdoor heat exchanger; by adjusting the opening degree of the electronic expansion valve, the surface of the second outdoor heat exchanger continues to frost, until the preset second defrosting condition is satisfied, The opening of the electronic expansion valve is opened to the maximum, so that the second outdoor heat exchanger releases heat, and the water formed by the defrosting is used to carry away the attached contaminants, thereby realizing self-cleaning of the second outdoor heat exchanger for chemicalization. Frost.
The air conditioner according to claim 8, wherein said self-cleaning controller is further configured to:

Detecting a temperature of the first outdoor heat exchanger;

Decreasing an opening degree of the electronic expansion valve according to a temperature of the first outdoor heat exchanger, so that a temperature of the first outdoor heat exchanger is lowered to a first set temperature;

Maintaining an opening degree of the electronic expansion valve when the temperature of the first outdoor heat exchanger drops to a first set temperature, so that the first outdoor heat exchanger surface continues to frost until the first defrosting is satisfied The first defrosting condition includes: the temperature of the first outdoor heat exchanger drops to a second set temperature or the opening of the electronic expansion valve is maintained for a time exceeding a first set time, the first The second set temperature is lower than the first set temperature;

After the temperature of the first outdoor heat exchanger reaches a preset first defrosting cutoff temperature, determining that the self-cleaning of the first outdoor heat exchanger is completed.
The air conditioner according to claim 8, wherein said self-cleaning controller is further configured to:

Detecting a temperature of the second outdoor heat exchanger;

Adjusting an opening degree of the electronic expansion valve according to a temperature of the second outdoor heat exchanger, so that a temperature of the second outdoor heat exchanger is lowered to a third set temperature;

Maintaining an opening degree of the electronic expansion valve when the temperature of the second outdoor heat exchanger drops to a third set temperature, so that the surface of the second outdoor heat exchanger continues to frost until the second defrosting is satisfied The second defrosting condition includes: the temperature of the second outdoor heat exchanger is decreased to a fourth set temperature or the opening of the electronic expansion valve is maintained for a time exceeding a second set time, The fourth set temperature is lower than the third set temperature;

After the temperature of the second outdoor heat exchanger reaches a preset second defrosting cutoff temperature, determining that the self-cleaning of the second outdoor heat exchanger is completed.