A defrosting method, a control device and an air conditioner

Abstract

The application discloses a defrosting method and device and an air conditioner, relates to the technical field of defrosting, and is applied to the air conditioner. The air conditioner comprises an outdoor coil, an indoor coil, an indoor fan, a compressor, a first expansion valve, a second expansion valve, a first pipeline and a second pipeline. The defrosting method comprises the following steps: when the air conditioner is running in a heating mode, the real-time temperature of the outdoor coil is acquired; according to the real-time temperature and a set threshold value, the air conditioner is triggered to run in a non-stop defrosting mode; the non-stop defrosting mode is that the first expansion valve is kept open, the indoor fan is kept rotating, and the second expansion valve is opened for a first running time and then closed, so that part of the refrigerant flowing out of the output end of the compressor can flow into the outdoor coil through the second pipeline, and the temperature of the outdoor coil is increased. The defrosting method can make the air conditioner still perform heating while defrosting, effectively avoids obvious fluctuation of the indoor temperature, and is favorable for improving the comfort of the air conditioner.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of defrosting, and in particular to a defrosting method, a control device and an air conditioner. BACKGROUND

[0002] A cold and warm air conditioner, i.e. an air conditioner, simultaneously has the functions of refrigeration and heating. After the air conditioner runs in the heating mode for a period of time, frost will form on the surface of the outdoor coil of the air conditioner. In order to avoid the frost layer on the outdoor coil affecting the heat exchange efficiency of the air conditioner, the air conditioner will run in the defrosting mode after running in the heating mode for a period of time, so as to remove the frost layer on the outdoor coil. In the prior art, the defrosting mode of the air conditioner is to switch the four-way reversing valve to change the flow direction of the refrigerant, so that the air conditioner stops heating and runs in the refrigeration mode, and in order to avoid blowing cold air on the indoor side, the indoor fan is stopped to defrost. This defrosting mode is also called the stop defrosting mode. After the frost layer on the outdoor coil is removed, the four-way reversing valve is switched again and the heating mode is run. This stop defrosting mode needs to interrupt the heating program of the indoor unit, which causes obvious temperature fluctuations on the indoor side and reduces the comfort of the air conditioner in the heating mode. SUMMARY

[0003] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a defrosting method, device and air conditioner, which can improve the comfort of the air conditioner.

[0004] In a first aspect, a defrosting method according to an embodiment of the present application is provided, characterized in that it is applied to an air conditioner, wherein the air conditioner comprises an outdoor coil, an indoor coil, an indoor fan, a compressor, a first expansion valve, a second expansion valve, a first pipeline and a second pipeline, the first pipeline and the second pipeline are arranged in parallel, the second expansion valve is arranged on the second pipeline, the indoor coil and the first expansion valve are both arranged on the first pipeline, and the indoor fan is arranged in cooperation with the indoor coil.

[0005] A first running time is preset.

[0006] When the air conditioner runs in the heating mode, the real-time temperature of the outdoor coil is obtained, and the air conditioner is triggered to run in the non-stop defrosting mode according to the real-time temperature and a set threshold.

[0007] The non-stop defrosting mode is that the first expansion valve remains open, the indoor fan remains rotating, and the second expansion valve is opened for the first running time and then closed, so that part of the refrigerant flowing out of the output end of the compressor can flow into the outdoor coil through the second pipeline, and the temperature of the outdoor coil is increased.

[0008] At least the following beneficial effects are achieved:

[0009] It can be understood that after the air conditioner runs the non-stop defrosting mode, the first expansion valve keeps open, the indoor fan keeps rotating, and the second expansion valve is open for a first running time and then closed. During the period when the first expansion valve and the second expansion valve are open at the same time, the refrigerant flowing out of the output end of the compressor is divided into two paths, that is, part of the refrigerant flows into the second pipeline, and another part of the refrigerant flows into the first pipeline. After part of the refrigerant flows into the second pipeline, it directly flows into the outdoor coil. Since this part of the refrigerant directly flows out of the output end of the compressor, the temperature of this part of the refrigerant is relatively high, so that this part of the refrigerant can raise the temperature of the outdoor coil, not only avoiding the frosting of the outdoor coil, but also melting the frost layer on the outdoor coil, achieving the purpose of defrosting. At the same time, another part of the refrigerant flows into the first pipeline and then flows into the outdoor coil through the indoor coil. This part of the refrigerant can keep the indoor coil at a relatively high temperature, and the indoor fan keeps rotating, so that the air blown by the indoor fan is still hot air, effectively avoiding the significant fluctuation of the indoor temperature caused by the large decrease of the indoor temperature. The defrosting method can make the air conditioner still perform heating while defrosting, effectively avoiding the significant fluctuation of the indoor temperature, and thus being beneficial to improving the comfort of the air conditioner.

[0010] In some embodiments of the present application, the triggering the air conditioner to run the non-stop defrosting mode according to the real-time temperature and a set threshold value comprises: presetting a defrosting temperature threshold value and a second temperature threshold value, wherein the defrosting temperature threshold value is greater than the second temperature threshold value; when the real-time temperature decreases to the second temperature threshold value, the air conditioner runs the non-stop defrosting mode once; after the air conditioner runs the non-stop defrosting mode once, the real-time temperature is obtained and it is judged whether the real-time temperature satisfies a first condition, wherein the first condition is that the real-time temperature is greater than or equal to the defrosting temperature threshold value; if the first condition is satisfied, the defrosting is ended, and when the real-time temperature decreases to the second temperature threshold value again, the air conditioner runs the non-stop defrosting mode once.

[0011] In some embodiments of the present application, the triggering the air conditioner to run the non-stop defrosting mode according to the real-time temperature and the set threshold value further comprises: presetting a first temperature threshold value, wherein the defrosting temperature threshold value, the first temperature threshold value and the second temperature threshold value are sequentially reduced; obtaining the real-time temperature when the air conditioner is running in the heating mode, and obtaining the cooling time required for the real-time temperature to decrease from the first temperature threshold value to the second temperature threshold value; presetting a plurality of different time threshold values, and setting a plurality of corresponding different defrosting allowed times according to the comparison result of the cooling time and the plurality of different time threshold values; when the real-time temperature decreases to the second temperature threshold value, the air conditioner runs the non-stop defrosting mode once, and after the air conditioner runs the non-stop defrosting mode once, the real-time temperature and the running number of the non-stop defrosting mode of the air conditioner are obtained, and it is judged whether the real-time temperature satisfies the first condition, if the first condition is not satisfied, it is judged whether the running number satisfies a second condition, wherein the second condition is that the running number is less than or equal to the corresponding defrosting allowed time; if the running number satisfies the second condition, the air conditioner continues to run the next non-stop defrosting mode until the real-time temperature satisfies the first condition or the running number does not satisfy the second condition.

[0012] In some embodiments of the present application, the triggering the air conditioner to run the non-stop defrosting mode according to the real-time temperature and the set threshold value further comprises: presetting a third temperature threshold value, which is lower than the second temperature threshold value; if the running number does not satisfy the second condition, it is judged whether the real-time temperature satisfies a third condition, wherein the third condition is that the real-time temperature is less than or equal to the third temperature threshold value; if the real-time temperature satisfies the third condition, the air conditioner runs the stop defrosting mode until the real-time temperature is greater than or equal to the defrosting temperature, and the air conditioner stops running the stop defrosting mode and runs the heating mode, and the defrosting is ended.

[0013] In some embodiments of the present application, the triggering the air conditioner to run the non-stop defrosting mode according to the real-time temperature and the set threshold value further comprises: if the real-time temperature does not satisfy the third condition, when the real-time temperature is less than or equal to the third temperature threshold value, the air conditioner runs the stop defrosting mode until the real-time temperature is greater than or equal to the defrosting temperature threshold value, and the air conditioner stops running the stop defrosting mode and runs the heating mode, and the defrosting is ended.

[0014] In some embodiments of the present application, the setting of the corresponding plurality of different defrosting times according to the comparison result of the temperature drop time and the plurality of different time thresholds comprises: the plurality of different time thresholds are respectively a first time threshold and a second time threshold, wherein the second time threshold is longer than the first time threshold; the plurality of different defrosting times are respectively a first defrosting time, a second defrosting time and a third defrosting time which are sequentially reduced; when the temperature drop time is less than the first time threshold, the corresponding defrosting time is the first defrosting time; when the temperature drop time is greater than or equal to the first time threshold and less than the second time threshold, the corresponding defrosting time is the second defrosting time; when the temperature drop time is greater than or equal to the second time threshold, the corresponding defrosting time is the third defrosting time.

[0015] In some embodiments of the present application, the non-stop defrosting mode further comprises: while the second expansion valve is opened, the rotating speed of the indoor fan is reduced and the rotating speed is restored after the first running time is maintained.

[0016] In some embodiments of the present application, the heating mode comprises: the first expansion valve is kept open, the second expansion valve is closed, and the indoor fan is kept rotating.

[0017] In a second aspect, embodiments of the present application provide a defrosting control device, comprising a processor and a memory, the processor and the memory are connected, the processor is used to call and execute a program stored in the memory, the memory is used to store the program, and the program is used to execute at least the defrosting method as described in the first aspect.

[0018] In a third aspect, embodiments of the present application provide an air conditioner, comprising the defrosting control device as described in the second aspect.

[0019] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0020] The present application will be further described with reference to the drawings and embodiments, wherein:

[0021] Figure 1 A flowchart of the defrosting method provided by an embodiment of the present application is shown in the figure;

[0022] Figure 2 A logic diagram of the defrosting method provided by an embodiment of the present application is shown in the figure;

[0023] Figure 3A refrigerant flow diagram of an air conditioner in a heating mode according to an embodiment of the present application;

[0024] Figure 4 A refrigerant flow diagram of an air conditioner in a non-stop defrosting mode according to an embodiment of the present application;

[0025] Figure 5 A refrigerant flow diagram of an air conditioner in a stop defrosting mode according to an embodiment of the present application;

[0026] Figure 6 A structure diagram of a defrosting control device according to another embodiment of the present application;

[0027] Reference numerals:

[0028] An outdoor coil 100;

[0029] An indoor coil 200; an indoor fan 210;

[0030] A compressor 300;

[0031] A first pipe 400; a first expansion valve 410; a second pipe 500; a second expansion valve 510; a third pipe 600; a four-way reversing valve 700; a processor 800; an input / output interface 801; a storage 802; a communication interface 804; a bus 805. DETAILED DESCRIPTION

[0032] Embodiments of the present application are described in detail below with reference to the attached drawings, which show by way of example, embodiments in which like numerals indicate like elements or elements having the same or similar function throughout the several views. The embodiments described below are exemplary only, and are not to be construed as limiting the present application.

[0033] In the description of the present application, it is to be understood that, in relation to the orientation description, for example, the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, and is only for the purpose of facilitating the description of the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0034] In the description of the present application, the plural refers to two or more. If there is a description of first, second, etc., it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the sequence of technical features indicated.

[0035] In the description of the present application, the words such as arrangement, installation, connection and the like should be understood in a broad sense unless otherwise explicitly limited, and the skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0036] The embodiment of the present application provides a defrosting method applied to an air conditioner. The air conditioner comprises an outdoor coil 100, an indoor coil 200, an indoor fan 210, a compressor 300, a first expansion valve 410, a second expansion valve 510, a first pipeline 400, a second pipeline 500 and a third pipeline 600. The first pipeline 400 and the second pipeline 500 are arranged in parallel. A first parallel connection of the first pipeline 400 and the second pipeline 500 is in communication with a first port of the outdoor coil 100. A second parallel connection of the first pipeline 400 and the second pipeline 500 is in communication with an output end of the compressor 300. An input end of the compressor 300 is in communication with a second port of the outdoor coil 100 through the third pipeline 600. The indoor coil 200 and the first expansion valve 410 are arranged on the first pipeline 400. The first expansion valve 410 is arranged between the indoor coil 200 and the outdoor coil 100. The second expansion valve 510 is arranged on the second pipeline 500. The indoor fan 210 is arranged in cooperation with the indoor coil 200.

[0037] The defrosting method comprises the following steps.

[0038] A first running time is preset.

[0039] When the air conditioner is running in a heating mode, a real-time temperature of the outdoor coil 100 is acquired.

[0040] According to the real-time temperature and a set threshold value, a running non-stop defrosting mode of the air conditioner is triggered.

[0041] The running non-stop defrosting mode keeps the first expansion valve 410 open, keeps the indoor fan 210 rotating, and keeps the second expansion valve 510 open for the first running time and then closed, so that part of the refrigerant flowing out of the output end of the compressor 300 can flow into the outdoor coil 100 through the second pipeline 500, and the temperature of the outdoor coil 100 is increased.

[0042] It can be understood that after the air conditioner runs the non-stop defrosting mode, the first expansion valve 410 remains open, the indoor fan 210 remains rotating, and the second expansion valve 510 is open for the first running time and then closed. During the period when the first expansion valve 410 and the second expansion valve 510 are open at the same time, the refrigerant flowing out of the output end of the compressor 300 will be divided into two paths, that is, part of the refrigerant will flow into the second pipeline 500, and another part of the refrigerant will flow into the first pipeline 400. After part of the refrigerant flows into the second pipeline 500, it will directly flow into the outdoor coil 100. Since this part of the refrigerant directly flows out of the output end of the compressor 300, the temperature of this part of the refrigerant is relatively high, so that this part of the refrigerant can raise the temperature of the outdoor coil 100, not only avoiding frosting of the outdoor coil 100, but also melting the frost layer on the outdoor coil 100, achieving the purpose of defrosting. At the same time, another part of the refrigerant flows into the first pipeline 400, and then flows into the outdoor coil 100 through the indoor coil 200. This part of the refrigerant can still keep the indoor coil 200 at a relatively high temperature, and the indoor fan 210 remains rotating, so that the wind blown by the indoor fan 210 is still hot air, effectively avoiding the temperature on the indoor side from being reduced sharply to cause obvious temperature fluctuations. The defrosting method can make the air conditioner still perform heating while defrosting, effectively avoiding the temperature on the indoor side from fluctuating obviously, thereby being beneficial to improving the comfort of the air conditioner in the heating working condition.

[0043] Specifically, referring to Figures 3 to 5 , the air conditioner of the embodiment of the present application further comprises a four-way reversing valve 700, which is used to change the flow direction of the refrigerant. When the four-way reversing valve 700 is in a first state, the flow direction of the refrigerant flowing out of the output end of the compressor 300 is to flow into the outdoor coil 100 first and then flow into the indoor coil 200, that is, a conventional refrigerating mode, that is, the defrosting of the outdoor coil 100 is performed in the refrigerating mode of the air conditioner commonly used in the prior art. At this time, since the refrigerant flowing through the indoor heat exchanger is low-temperature refrigerant, in order not to reduce the indoor environment temperature, the indoor fan 210 is closed, so that the indoor air will not flow through the indoor heat exchanger to be cooled. When the four-way reversing valve 700 is switched to a second state, the flow direction of the refrigerant flowing out of the output end of the compressor 300 is to flow into the indoor coil 200 first and then flow into the outdoor coil 100, that is, a conventional heating mode.

[0044] Referring to Figures 3 to 5 , the four-way reversing valve 700 has an E interface, an S interface, a D interface and a C interface. Referring to Figure 5 , when the four-way reversing valve 700 is in the first state, the D interface and the C interface are connected, and the E interface and the S interface are connected, so that the output end of the compressor 700 is connected with the second port of the outdoor coil 100 through the D interface, the C interface and the third pipeline 600, and the input end of the compressor 700 is connected with the second parallel connection position of the first pipeline 400 and the second pipeline 500 through the E interface and the S interface. Referring toFigure 3 and Figure 4 When the four-way reversing valve 700 is in the second state, the E interface and the D interface are in communication, and the S interface and the C interface are in communication, so that the output end of the compressor 700 is in communication with the second parallel connection of the first pipeline 400 and the second pipeline 500 through the E interface and the D interface, and the input end of the compressor 700 is in communication with the second port of the outdoor coil 100 through the S interface and the C interface and the third pipeline 600.

[0045] In the embodiment of the present application, the air conditioner has at least three modes, a heating mode, a non-stop defrosting mode and a stop defrosting mode, which will be described in detail below with reference to the accompanying drawings. Figure 3 A refrigerant flow schematic diagram for the air conditioner in the heating mode, in which the four-way reversing valve 700 is in the second state, the indoor fan 210 rotates, the first expansion valve 410 remains open, the indoor fan 210 remains rotating, and the second expansion valve 510 remains closed. The refrigerant flowing out of the output end of the compressor 300 flows through the indoor coil 200 and the first expansion valve 410 in sequence through the first pipeline 400 and flows into the outdoor coil 100. The refrigerant flowing out of the outdoor coil 100 reflows into the input end of the compressor 300 through the third pipeline 600, and so on, to realize heating.

[0046] Figure 4 A refrigerant flow schematic diagram for the air conditioner in the non-stop defrosting mode, in which the four-way reversing valve 700 is in the second state, the indoor fan 210 remains rotating, the first expansion valve 410 remains open, and the second expansion valve 510 is open for a first running time and then closed. Part of the refrigerant flowing out of the output end of the compressor 300 flows into the outdoor coil 100 through the second pipeline 500, and another part of the refrigerant flowing out of the output end of the compressor 300 flows into the outdoor coil 100 through the first pipeline 400. The refrigerant flowing out of the outdoor coil 100 reflows into the input end of the compressor 300 through the third pipeline 600, and so on, to realize non-stop rotation of the fan and to realize non-stop defrosting while heating.

[0047] As an embodiment of the present application, the non-stop defrosting mode further comprises, while the second expansion valve 510 is open, the speed of the indoor fan 210 is reduced and the speed is restored after maintaining the first running time. It can be understood that, while the second expansion valve 510 is open, the speed of the indoor fan 210 is also reduced synchronously, and the indoor fan 210 maintains the low speed for the same time as the opening time of the second expansion valve 510, and the speed of the indoor fan 210 is restored after the second expansion valve 510 is closed. It can be understood that, after the second expansion valve 510 is open, part of the refrigerant will flow into the outdoor coil 100 through the second pipeline 500, which will cause the temperature of the indoor coil 200 to decrease. By reducing the speed of the indoor fan 210, the cold air feeling can be effectively reduced, which is conducive to improving the comfort of the air conditioner.

[0048] Figure 5 The refrigerant flow schematic diagram when the air conditioner is in the defrosting mode, at this time the four-way reversing valve 700 is in the first state, the indoor fan 210 stops rotating, the first expansion valve 410 remains open, the second expansion valve 510 is closed, the refrigerant flowing out of the output end of the compressor 300 flows into the outdoor coil 100 through the third pipeline 600, the refrigerant flowing out of the outdoor coil 100 flows through the first expansion valve 410 and the indoor coil 200 and flows into the input end of the compressor 300 through the first pipeline 400, so as to realize the circulation and reciprocating flow, and realize the defrosting in the stop mode.

[0049] Referring to Figure 1 , Figure 1 A flow chart of a defrosting method provided by the embodiment of the application, the defrosting method includes but is not limited to the following steps:

[0050] Step S11, when the air conditioner is in the heating mode, the real-time temperature of the outdoor coil 100 is obtained.

[0051] It needs to be explained that after the user controls the air conditioner to enter the heating mode, the temperature sensor is turned on and the temperature of the outdoor coil 100 is monitored in real time to obtain the real-time temperature of the outdoor coil 100. The temperature sensor can be installed at a position close to the outdoor coil 100 of the outdoor shell to accurately obtain the real-time temperature of the outdoor coil 100. After the air conditioner enters the heating mode, when the temperature of the outdoor coil decreases to a certain temperature threshold, the timer starts to count. The timer is mainly used to record and obtain the time required for the temperature of the outdoor coil 100 to decrease from a certain temperature value to another temperature value, that is, the timer is mainly used to record and obtain the cooling time of the outdoor coil 100.

[0052] Step S12, according to the real-time temperature and the set threshold, triggering the air conditioner to run the non-stop defrosting mode.

[0053] It needs to be explained that when the real-time temperature of the outdoor coil 100 reaches a certain temperature threshold, the controller will control the first expansion valve 410 to remain open and the second expansion valve 510 to open, and the indoor fan 210 to remain rotating, and the second expansion valve 510 to open for a first running time and then to close.

[0054] In an embodiment, according to the real-time temperature and the set threshold, triggering the air conditioner to run the non-stop defrosting mode, including:

[0055] The preset defrosting temperature threshold and the second temperature threshold, wherein the defrosting temperature threshold is greater than the second temperature threshold, when the real-time temperature drops to the second temperature threshold, the air conditioner runs the once non-stop defrosting mode; after the air conditioner runs the once non-stop defrosting mode each time, the real-time temperature is obtained and it is judged whether the real-time temperature meets the first condition, wherein the first condition is that the real-time temperature is greater than or equal to the defrosting temperature threshold; if the real-time temperature meets the first condition, the defrosting is ended, the real-time temperature is obtained, and when the real-time temperature drops to the second temperature threshold, the air conditioner runs the once non-stop defrosting mode.

[0056] Wherein the real-time temperature can be represented as t 外管 , the defrosting temperature threshold can be represented as t0, and the second temperature threshold can be represented as t2, wherein t0>t2. The defrosting temperature t0 can be set by experimental data, that is, when the temperature of the outdoor coil 100 is greater than or equal to the defrosting temperature t0, the frost layer on the outdoor coil 100 can be melted and removed, that is, when the temperature t 外管 of the outdoor coil is greater than or equal to t0, the outdoor coil 100 is in a frost-free state. t2 can be set according to the outdoor environment temperature and humidity, t2 is the outdoor coil temperature threshold when starting the non-stop defrosting, at this time the outdoor coil 100 has thin frost, which can be understood as t2 is the temperature threshold of the outdoor coil 100 with thin frost. When the air conditioner runs the heating mode, t 外管 is obtained. With the increase of the running time of the air conditioner in the heating mode, t 外管 begins to gradually decrease. When t 外管 decreases to t2, the air conditioner starts to run the once non-stop defrosting mode. After the air conditioner runs the once non-stop defrosting mode each time, t 外管 is obtained and it is judged whether t 外管 is greater than or equal to t0. If t 外管 is greater than or equal to t0, it means that the current temperature of the outdoor coil 100 reaches the defrosting temperature and will not frost, the defrosting is ended, t 外管 is continuously obtained, and when t 外管 drops to t2, the air conditioner runs the once non-stop defrosting mode, and the cycle is repeated.

[0057] It needs to be explained that the preset first running time can be defined as T 运1 , and the preset shutdown time can be defined as T 关 . In the embodiment of the application, the once non-stop defrosting mode can be that the second expansion valve 510 is opened and maintained for T 运1 , then closed, and maintained in a closed state for T 关 , and the period of T 运1 +T 关 is once. After running the once non-stop defrosting mode, t 外管 is obtained, the air conditioner runs the once non-stop defrosting mode, and the cycle is repeated. T运1 and T 关 The time of the non-stop defrosting mode can be set according to the outdoor environment temperature and humidity, or set through experimental data. In the embodiment of the present application, when the defrosting speed of the outdoor coil 100 is faster, T 运1 and T 关 = 1 min; when the defrosting speed of the outdoor coil 100 is slower, T 运1 and T 关 = 10-30 min. On the other hand, T 运1 and T 关 can be set according to the real-time cooling speed of the outdoor coil 100, which will not be further described herein.

[0058] In an embodiment, according to the real-time temperature and the set threshold value, the air conditioner is triggered to run the non-stop defrosting mode, further comprising:

[0059] a first temperature threshold value is preset, wherein the defrosting temperature threshold value, the first temperature threshold value and the second temperature threshold value decrease in turn;

[0060] when the air conditioner is running in the heating mode, the real-time temperature is obtained, and the cooling time required for the real-time temperature to decrease from the first temperature threshold value to the second temperature threshold value is obtained;

[0061] a plurality of different time threshold values are preset, and according to the comparison result of the cooling time and the plurality of different time threshold values, a plurality of different allowed defrosting times corresponding thereto are set;

[0062] when the real-time temperature decreases to the second temperature threshold value, the air conditioner runs the non-stop defrosting mode once, and after the air conditioner runs the non-stop defrosting mode once, the real-time temperature and the running number of times of the non-stop defrosting mode that the air conditioner has run are obtained, and it is judged whether the real-time temperature satisfies the first condition, if the first condition is not satisfied, it is judged whether the running number of times satisfies the second condition, wherein the second condition is that the running number of times is less than or equal to the allowed defrosting time corresponding thereto;

[0063] if the running number of times satisfies the second condition, the air conditioner continues to run the next non-stop defrosting mode, until the real-time temperature satisfies the first condition or the running number of times does not satisfy the second condition.

[0064] It should be explained that the first temperature threshold value can be represented as t1, the cooling time can be represented as T 降 , and the running number of times of the non-stop defrosting mode that the air conditioner has run can be represented as X, wherein t0>t1>t2. t1 is the temperature threshold value at which the outdoor coil 100 just starts to defrost.

[0065] It can be understood that after the air conditioner starts the heating mode, t 外管With the continuous operation of the heating mode, t 外管 is gradually reduced, and when t 外管 is reduced to t1, timing is started. When t 外管 is reduced to t2, timing is stopped, and t 外管 is obtained. The time T 降 required for t 外管 to be reduced from t1 to t2 is obtained.

[0066] When t 外管 is reduced to t2, the air conditioner is operated once without stopping defrosting. After the air conditioner is operated once without stopping defrosting, t 外管 and X are obtained, and it is determined whether t 外管 satisfies the first condition. When t 外管 does not satisfy the first condition, that is, t 外管 is still less than t0 after the air conditioner is operated once without stopping defrosting, it means that there is still a risk of frosting on the outdoor coil 100 or a risk that the frost on the outdoor coil 100 has not been completely removed, and the next operation without stopping defrosting needs to be continued until t 外管 satisfies the first condition or X does not satisfy the second condition. Since the opening of the second expansion valve 510 causes part of the refrigerant to be used to heat the outdoor coil 100, and another part of the refrigerant flowing out of the first pipeline 400 mixes with the part of the refrigerant flowing out of the second pipeline 500 to cause the temperature of the part of the refrigerant to be reduced, the defrosting effect of the part of the refrigerant is limited, and there may be a case where t 外管 still cannot satisfy the first condition after multiple operations of the mode without stopping defrosting. Therefore, the number of times of operation of the mode without stopping defrosting needs to be limited. On the other hand, when the air conditioner is in the mode without stopping defrosting, the heating effect of the air conditioner is also reduced. In order to avoid the air conditioner being in a poor heating effect for a long time, and in order to avoid the defrosting in the mode without stopping defrosting being incomplete, the number of times of operation of the mode without stopping defrosting also needs to be limited.

[0067] T 降 characterizes the cooling speed of the outdoor coil 100 under the current environment, and when T 降 is large, that is, the cooling speed of the outdoor coil 100 under the current environment is slow, the number of times of operation of the mode without stopping defrosting can be small, that is, t 外管 can satisfy the first condition through a small number of times of operation of the mode without stopping defrosting; and when T 降 is small, that is, the cooling speed of the outdoor coil 100 under the current environment is fast, the number of times of operation of the mode without stopping defrosting can be large, that is, t 外管 can satisfy the first condition through a large number of times of operation of the mode without stopping defrosting. There are a plurality of different time thresholds, and according to the comparison result of T 降 and the plurality of different time thresholds, a plurality of different allowed defrosting times corresponding thereto are set.

[0068] When t 外管 When the first condition is not met, it is determined whether the number of times X that the non-stop defrosting mode is run meets a second condition, the second condition being whether X is less than or equal to T 降 Corresponding to the allowed defrosting times, if X meets the second condition, the air conditioner continues to run the next non-stop defrosting mode and obtains t 外管 And X, it is continuously determined whether t 外管 Meets the first condition and whether X meets the second condition, until t 外管 Meets the first condition, the defrosting ends, or X does not meet the second condition.

[0069] It needs to be explained that the number of times X that the non-stop defrosting mode has been run is cleared after the defrosting ends, and the cooling time T 降 Of the outdoor unit coil 100 is also cleared after the defrosting ends, and when t 外管 Is reduced to t0 again, the timing starts, and when t 外管 Is reduced to t2, T 降 Is obtained again.

[0070] Reference Figure 2 In an embodiment, according to the real-time temperature and the set threshold value, the air conditioner is triggered to run the non-stop defrosting mode, further comprising:

[0071] A third temperature threshold value is preset, the third temperature threshold value being lower than the second temperature threshold value, and a second running time is preset;

[0072] If the number of times does not meet the second condition, it is determined whether the real-time temperature meets a third condition, wherein the third condition is that the real-time temperature is less than or equal to the third temperature threshold value;

[0073] If the real-time temperature meets the third condition, the air conditioner runs the stop defrosting mode and maintains the second running time, so that the real-time temperature is greater than or equal to the defrosting temperature threshold value, and after the air conditioner stops running the stop defrosting mode, the air conditioner runs the heating mode, and the defrosting ends.

[0074] It needs to be explained that the third temperature threshold value can be represented as t3, wherein t0>t1>t2>t3. In the embodiment of the present application, t0, t1, t2 and t3 can be obtained through experimental data, or can be set according to the outdoor environment temperature and humidity, wherein t0 is the defrosting temperature, and t3 is the critical temperature threshold value at which the outdoor unit coil 100 is thick with frost. When t 外管 Is less than or equal to t3, t 外管 Must be quickly raised and greater than or equal to t0, otherwise the thicker frost layer will greatly reduce the heating effect of the air conditioner. The second running time can be represented as T 运2 .

[0075] It can be understood that if the running times X does not satisfy the second condition, i.e. X is greater than T 降 The corresponding allowed defrosting times indicate that the multiple non-stop defrosting mode cannot make t 外管 greater than or equal to t0, at this time, it is judged whether t 外管 satisfies the third condition. The third condition is that t 外管 is less than or equal to t3, if t 外管 satisfies the third condition, it indicates that the current t 外管 temperature is very low, and thick frost has been formed on the outdoor coil 100, at this time, the air conditioner switches the four-way reversing valve 700 to the first state to perform the stop defrosting mode and maintains T 运2 , so that t 外管 quickly rises to be greater than or equal to t0, and the frost layer on the outdoor coil 100 is completely melted. After the air conditioner stops running in the stop defrosting mode and switches the four-way reversing valve 700 to the second state to perform the heating mode, the defrosting is ended. The air conditioner runs in the stop defrosting mode for T 运2 time and then is turned off, which can avoid that there is a frost layer remaining on the outdoor coil. As an embodiment of the present application, T 运2 may be 3 min to 8 min.

[0076] In an embodiment, if the running times do not satisfy the second condition, it is judged whether the real-time temperature satisfies the third condition, wherein the third condition is that the real-time temperature is less than or equal to a third temperature threshold value.

[0077] If the real-time temperature satisfies the third condition, the air conditioner runs in the stop defrosting mode and maintains a second running time, so that the real-time temperature is greater than or equal to the defrosting temperature. After the air conditioner stops running in the stop defrosting mode, it runs in the heating mode, and the defrosting is ended.

[0078] It can be understood that if the running times X does not satisfy the second condition, and t 外管 does not satisfy the third condition, i.e. t 外管 is greater than t3, it indicates that the current t 外管 temperature does not drop to be very low to cause thick frost to be formed on the outdoor coil 100, at this time, the air conditioner normally runs in the heating mode, and when t 外管 is less than or equal to t3, the air conditioner switches the four-way reversing valve 700 to the first state to perform the stop defrosting mode and maintains T 运2 , so that t 外管 quickly rises to be greater than or equal to t0. After the air conditioner stops running in the stop defrosting mode and switches the four-way reversing valve 700 to the second state to perform the heating mode, the defrosting is ended.

[0079] It needs to be explained that in an embodiment of the present application, after the defrosting is ended, the air conditioner continues to acquire t 外管 , and when t 外管When t falls to t2, the air conditioner runs the non-stop defrosting mode once, and the above process is repeated in a cycle until the user controls the air conditioner to turn off the heating mode.

[0080] Specifically, in an embodiment, according to the comparison result of the cooling time and a plurality of different time thresholds, a plurality of different allowed defrosting times corresponding thereto are set, including:

[0081] The plurality of different time thresholds are respectively a first time threshold and a second time threshold, wherein the second time threshold is longer than the first time threshold;

[0082] The plurality of different allowed defrosting times are respectively a first allowed defrosting time, a second allowed defrosting time and a third allowed defrosting time which are sequentially reduced;

[0083] When the cooling time is less than the first time threshold, the corresponding allowed defrosting time is the first allowed defrosting time;

[0084] When the cooling time is greater than or equal to the first time threshold and less than the second time threshold, the corresponding allowed defrosting time is the second allowed defrosting time;

[0085] When the cooling time is greater than or equal to the second time threshold, the corresponding allowed defrosting time is the third allowed defrosting time.

[0086] It needs to be explained that the first time threshold can be represented as T1, and the second time threshold can be represented as T2, wherein T1

[0087] It can be understood that after the air conditioner starts the heating mode, t 外管 is obtained. With the continuous running of the heating mode, t 外管 gradually decreases, and when t 外管 decreases to t1, the timing starts. When t 外管 decreases to t2, the timing stops, and t 外管 is obtained. The time T 降 required for t 降 to decrease from t1 to t2. When T 降 外管 is greater than T1, it means that the cooling speed of the current outdoor coil 100 is fast, and at this time T 降 corresponding to the allowed defrosting time is X1, that is, the number of times of running the non-stop defrosting mode can be increased, so that t 降 can meet the first adjustment; when T1≤T 降 ​≥ T2, which means that the current outdoor coil 100 has a slow cooling speed, and T 降 The corresponding allowed defrosting times are X3, which means that the number of times of running the non-stop defrosting mode can be reduced, so that t 外管 The first condition can be met.

[0088] Reference Figure 2 In an embodiment, t0=8℃, t1=0℃, t2=-5℃, t3=-10℃, T1=5min, T2=7min, X1=5, X2=4, and X3=2. After the user controls the air conditioner to start the heating mode, t 外管 is detected in real time, and t 外管 is obtained. With the running of the heating mode, t 外管 gradually decreases. When t 外管 decreases to 0℃, the timing starts. When t 外管 decreases to -5℃, the timing stops, and t 外管 is obtained. The cooling time T 降 from 0℃ to -5℃ is obtained, and the allowed defrosting times are set according to T 降 . When T 降 is less than 5min, the allowed defrosting times are 5 times; when 5min≤T 降 <7min, the allowed defrosting times are 4 times; and when T 降 ≥7min, the allowed defrosting times are 2 times.

[0089] When t 外管 decreases to -5℃, the air conditioner runs the non-stop defrosting mode once. After the air conditioner runs the non-stop defrosting mode once, t 外管 is obtained, the number of times X that the air conditioner has run the non-stop defrosting mode is obtained, and it is judged whether t 外管 meets the first condition (whether t 外管 is greater than or equal to 8℃).

[0090] When t 外管 meets the first condition, the defrosting ends, and the next cycle is performed, which will not be described herein.

[0091] When t 外管 does not meet the first condition, it is judged whether X meets the second condition (whether X is less than or equal to the corresponding allowed defrosting times).

[0092] When X meets the second condition, the air conditioner performs the next non-stop defrosting mode, and t 外管 and X are obtained, and the cycle is repeated until t 外管 meets the first condition or X does not meet the second condition. When t 外管 meets the first condition, the defrosting ends, and the next cycle is performed, which will not be described herein.

[0093] If X does not satisfy the second condition, then determine t. 外管 Does the third condition (t) satisfy? 外管 (Is it less than or equal to -10℃?)

[0094] If t 外管 When the third condition is met, the air conditioner operates in defrost mode and maintains T. 运2 , making t 外管 When the temperature is greater than or equal to 8℃, the air conditioner will shut down the defrosting mode and then restart the heating mode. After defrosting is complete, the next cycle will begin. This will not be elaborated further here.

[0095] If t 外管 If the third condition is not met, the air conditioner will operate normally in heating mode until t. 外管 Less than or equal to -10℃. When t 外管 When the temperature is less than or equal to -10℃, the air conditioner operates in defrost mode and maintains a T temperature range. 运2 , making t 外管 When the temperature is greater than or equal to 8℃, the air conditioner will shut down the defrosting mode and then restart the heating mode. After defrosting is complete, the next cycle will begin. This will not be elaborated further here.

[0096] refer to Figure 6 The present invention also provides a defrosting control device, including a processor 800 and a memory 802, the processor 800 and the memory 802 being connected together. The processor 800 is used to call and execute a program stored in the memory 802, the memory 802 is used to store the program, and the program is used to execute a defrosting method.

[0097] The processor 800 can be implemented using a general-purpose central processing unit (CPU), microprocessor, application-specific integrated circuit (ASIC), or one or more integrated circuits, and is used to execute relevant programs to implement the technical solutions provided in the embodiments of this application. The memory 802 can be implemented using a read-only memory (ROM), static storage device, dynamic storage device, or random access memory (RAM). The memory 802 can store the operating system and other application programs. When the technical solutions provided in the embodiments of this specification are implemented through software or firmware, the relevant program code is stored in the memory 802 and is called by the processor 800 to execute the defrosting method of the embodiments of this application.

[0098] The defrosting control device further comprises an input / output interface 801, a communication interface 804 and a bus 805. The input / output interface 801 is configured to realize information input and output; the communication interface 804 is configured to realize communication interaction between the device and other devices, and the communication can be realized in a wired manner (for example, a USB, a network cable and the like) or in a wireless manner (for example, a mobile network, WIFI, Bluetooth and the like); and the bus 805 is configured to transmit information between various components (for example, the processor 800, the memory 802, the input / output interface 801 and the communication interface 804) of the device. The processor 800, the memory 802, the input / output interface 801 and the communication interface 804 are connected to each other in the device through the bus 805.

[0099] The application further provides an air conditioner comprising the defrosting control device described in the above embodiments.

[0100] Those skilled in the art can understand that all or some steps in the above disclosed method and system can be implemented as software, firmware, hardware and appropriate combinations thereof. Some or all physical components can be implemented as software executed by a processor such as a central processing unit, a digital signal processor or a microprocessor, or as hardware, or as an integrated circuit such as an application specific integrated circuit. Such software can be distributed on a computer readable medium, which can include computer storage media (or non-transitory media) and communication media (or transitory media). As known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and can be accessed by a computer. In addition, as known to those skilled in the art, communication media generally include computer readable instructions, data structures, program modules or other data in modulated data signals such as carrier waves or other transport mechanisms, and can include any information delivery medium.

[0101] The above is a specific description of the preferred embodiments of the application, but the application is not limited to the above embodiments. Those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the application, and these equivalent modifications or replacements are all included in the scope defined by the claims of the application.

[0102] Of course, the present application is not limited to the above-described embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the present application, and these equivalent modifications or substitutions are included in the scope defined by the claims of the present application.

Claims

1. A defrosting method characterized by, The application is applied to an air conditioner, and the air conditioner comprises an outdoor coil, an indoor coil, an indoor fan, a compressor, a first expansion valve, a second expansion valve, a first pipeline and a second pipeline. The defrosting method comprises: presetting a first running time, a defrosting temperature threshold, a second temperature threshold, a first temperature threshold, a third temperature threshold, a second running time and a plurality of different time thresholds, wherein the defrosting temperature threshold, the first temperature threshold, the second temperature threshold and the third temperature threshold decrease in turn; when the air conditioner is running in a heating mode, obtaining a real-time temperature of the outdoor coil and a temperature drop time required for the real-time temperature to decrease from the first temperature threshold to the second temperature threshold, and setting a plurality of different allowed defrosting times according to a comparison result of the temperature drop time and the plurality of different time thresholds; when the real-time temperature decreases to the second temperature threshold, the air conditioner runs a non-stop defrosting mode once, and after the air conditioner runs the non-stop defrosting mode once, the real-time temperature and a running number of the non-stop defrosting mode are obtained, and it is judged whether the real-time temperature satisfies a first condition, wherein the first condition is that the real-time temperature is greater than or equal to the defrosting temperature threshold; if the real-time temperature satisfies the first condition, defrosting is ended, and when the real-time temperature decreases to the second temperature threshold again, the air conditioner runs the non-stop defrosting mode once; if the real-time temperature does not satisfy the first condition, it is judged whether the running number satisfies a second condition, wherein the second condition is that the running number is less than or equal to the allowed defrosting time; if the running number satisfies the second condition, the air conditioner continues to run the next non-stop defrosting mode until the real-time temperature satisfies the first condition or the running number does not satisfy the second condition; if the running number does not satisfy the second condition, it is judged whether the real-time temperature satisfies a third condition, wherein the third condition is that the real-time temperature is less than or equal to the third temperature threshold; if the real-time temperature satisfies the third condition, the air conditioner runs a stop defrosting mode and maintains the second running time, so that the real-time temperature is greater than or equal to the defrosting temperature threshold, and after the air conditioner stops running the stop defrosting mode, the air conditioner runs the heating mode, and defrosting is ended; the non-stop defrosting mode is that the first expansion valve is kept open, the indoor fan is kept rotating, and the second expansion valve is opened for the first running time and then closed, so that part of refrigerant flowing out from the output end of the compressor can flow into the outdoor coil through the second pipeline, and the temperature of the outdoor coil is increased.

2. The defrosting method according to claim 1, characterized in that, Further comprising: If the real-time temperature does not satisfy the third condition, when the real-time temperature is less than or equal to the third temperature threshold, the air conditioner runs a defrost mode with shutdown and maintains the second running time, so that the real-time temperature is greater than or equal to the defrost temperature threshold, after the air conditioner stops running the defrost mode with shutdown, the air conditioner runs the heating mode, and the defrosting is completed.

3. The defrosting method according to claim 1, characterized in that, The setting of the corresponding plurality of different allowed defrosting times according to the comparison result of the cooling time and the plurality of different time thresholds comprises: The plurality of different time thresholds are respectively a first time threshold and a second time threshold, wherein the second time threshold is greater than the first time threshold; The plurality of different allowed defrosting times are respectively a first allowed defrosting time, a second allowed defrosting time and a third allowed defrosting time which are sequentially reduced; When the cooling time is less than the first time threshold, the corresponding allowed defrosting time is the first allowed defrosting time; When the cooling time is greater than or equal to the first time threshold and less than the second time threshold, the corresponding allowed defrosting time is the second allowed defrosting time; When the cooling time is greater than or equal to the second time threshold, the corresponding allowed defrosting time is the third allowed defrosting time.

4. The defrosting method according to claim 1, characterized by, The defrosting mode without shutdown further comprises: while the second expansion valve is opened, the rotating speed of the indoor fan is reduced and the rotating speed is restored after maintaining the first running time.

5. The defrosting method according to claim 1, wherein The heating mode comprises: the first expansion valve is kept open, the second expansion valve is closed, and the indoor fan is kept rotating.

6. A defrosting control device characterized by comprising: The air conditioner comprises: A processor and a memory, the processor and the memory are connected, the processor is used to call and execute a program stored in the memory, the memory is used to store the program, and the program is used to execute at least the defrosting method in any one of claims 1-5.

7. An air conditioner characterized by comprising: The defrosting control device according to claim 6. The defrosting control device according to claim 6.

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