Defrosting control method and device for air conditioner and air conditioner

Abstract

The invention relates to the technical field of intelligent household appliances, and discloses a defrosting control method and device for an air conditioner and the air conditioner. An outdoor unit of the air conditioner comprises an outdoor heat exchanger and an outdoor fan, and a defrosting sensor is arranged on the outdoor heat exchanger. The defrosting control method comprises the steps that when the air conditioner operates in a heating mode and it is confirmed that an outdoor heat exchanger needs to be defrosted, the number of defrosting times of the air conditioner in a conventional defrosting mode is obtained; under the condition that the number of defrosting times is larger than the set number of times, the outdoor heat exchanger is heated and defrosted; a first temperature detected by the defrosting sensor is obtained, and under the condition that the first temperature is larger than a first temperature threshold value, the outdoor fan is controlled to rotate reversely; and a second temperature detected by the defrosting sensor is obtained every first duration, and under the condition that the second temperature is larger than a second temperature threshold value, the outdoor heat exchanger is controlled to stop heating and defrosting, and the outdoor fan is controlled to stop. The risk that the heat exchange effect of the outdoor heat exchanger becomes poor can be reduced.

Description

Technical Field

[0001] This application relates to the technical field of intelligent household appliances, for example, to a defrosting control method and device for an air conditioner, and an air conditioner. Background Art

[0002] When an air conditioner (such as a central air conditioner or a household air conditioner) operates in a heating mode, due to the low outdoor environmental temperature and high air humidity, the outdoor heat exchanger of the outdoor unit of the air conditioner is extremely likely to frost, affecting the heating effect of the indoor unit.

[0003] In the related art, to solve the above problems, a defrosting sensor and a heating device are provided on the outdoor heat exchanger. The outdoor heat exchanger is defrosted by the heating device, and whether to start and end defrosting of the outdoor heat exchanger is determined by the temperature detected by the defrosting sensor.

[0004] In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:

[0005] In the solution of the related art, after each defrosting, a small amount of defrosting water remains on the surface and bottom of the outdoor heat exchanger. After the air conditioner resumes operation in the heating mode, this defrosting water will re-condense into frost or ice at the bottom of the outdoor heat exchanger. As the number of defrosting times increases, the frost layer at the bottom of the outdoor heat exchanger will become thicker and thicker. Subsequently, even if the outdoor heat exchanger is heated for defrosting, the frost layer at the bottom of the outdoor heat exchanger cannot be completely removed, which will cause the heat exchange effect of the outdoor heat exchanger to deteriorate.

[0006] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of the present application, and thus may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention

[0007] To provide a basic understanding of some aspects of the disclosed embodiments, a simple summary is given below. This summary is not a comprehensive review, nor is it intended to identify key / important elements or delineate the scope of protection of these embodiments. Instead, it serves as a prelude to the following detailed description.

[0008] The embodiments of the present disclosure provide a defrosting control method and device for an air conditioner, and an air conditioner, which can reduce the risk of deterioration of the heat exchange effect of the outdoor heat exchanger.

[0009] In some embodiments, the outdoor unit of the air conditioner includes an outdoor heat exchanger and an outdoor fan. A defrosting sensor is provided on the outdoor heat exchanger. The defrosting control method for the air conditioner includes: when the air conditioner is operating in the heating mode and it is confirmed that the outdoor heat exchanger needs defrosting, obtaining the number of defrosting times of the air conditioner in the conventional defrosting mode; when the number of defrosting times is greater than the set number, performing heating defrosting on the outdoor heat exchanger; obtaining the first temperature detected by the defrosting sensor, and when the first temperature is greater than the first temperature threshold, controlling the outdoor fan to reverse; obtaining the second temperature detected by the defrosting sensor every first time period, and when the second temperature is greater than the second temperature threshold, controlling the outdoor heat exchanger to stop heating defrosting and the outdoor fan to stop operating.

[0010] In the embodiments of the present disclosure, when the number of defrosting times of the air conditioner in the conventional defrosting mode is greater than the set number, it indicates that the frost layer accumulated at the bottom of the outdoor heat exchanger is relatively thick. After performing heating defrosting on the outdoor heat exchanger to make the surface temperature of the outdoor heat exchanger (i.e., the first temperature) greater than the first temperature threshold, by controlling the outdoor fan to reverse, the melting speed of the frost layer at the bottom of the outdoor heat exchanger can be accelerated, and the defrosting water can be discharged more quickly. In this way, after the defrosting ends this time, the frost layer accumulated at the bottom of the outdoor heat exchanger can be removed completely, avoiding the influence of the too thick bottom frost layer on the heat exchange effect of the outdoor heat exchanger. Therefore, the embodiments of the present disclosure can reduce the risk of the deterioration of the heat exchange effect of the outdoor heat exchanger.

[0011] Optionally, performing heating defrosting on the outdoor heat exchanger includes: starting the heating device provided on the outdoor heat exchanger; and / or, guiding the high-temperature gas in the compressor chamber to the surface of the outdoor heat exchanger.

[0012] In this embodiment, heating defrosting of the outdoor heat exchanger is realized.

[0013] Optionally, the method for confirming whether the outdoor heat exchanger needs defrosting is as follows: obtaining the third temperature on the surface of the outdoor heat exchanger; when the third temperature is less than the frost point temperature and lasts for the first set time period, confirming that the outdoor heat exchanger needs defrosting.

[0014] In this embodiment, accurate detection of whether the outdoor heat exchanger needs defrosting is realized.

[0015] Optionally, the defrosting control method for the air conditioner further includes: when the number of defrosting times is less than or equal to the set number, performing defrosting on the outdoor heat exchanger in the conventional defrosting mode; where the conventional defrosting mode is to start the heating device on the outdoor heat exchanger to heat the surface of the outdoor heat exchanger for the second set time period, or to guide the high-temperature gas in the compressor chamber to the surface of the outdoor heat exchanger for the second set time period.

[0016] In this embodiment, when the defrosting times are less than or equal to the set times, the outdoor heat exchanger is defrosted in the conventional defrosting mode. During the defrosting process, it is not necessary to control the outdoor fan to reverse. Since the reverse rotation of the fan will reduce the service life of the outdoor fan and increase the energy consumption. Therefore, the embodiments of the present disclosure can reduce the energy consumption during the defrosting process and improve the service life of the outdoor fan.

[0017] Optionally, after obtaining the second temperature detected by the defrosting sensor, the defrosting control method for the air conditioner further includes: when the second temperature is less than or equal to the second temperature threshold, obtaining the reverse rotation duration of the outdoor fan; when the reverse rotation duration is greater than the second duration, controlling the outdoor heat exchanger to stop heating and defrosting, and the outdoor fan to stop.

[0018] In this embodiment, if the reverse rotation duration of the outdoor fan is greater than the second duration, even if the second temperature detected by the defrosting sensor obtained every first duration is not greater than the second temperature threshold, the defrosting will stop. In this way, it is avoided that the room cannot obtain heating for a long time, and on the basis of ensuring the heat exchange effect of the outdoor heat exchanger to the greatest extent, the user experience is improved.

[0019] Optionally, after the outdoor fan stops, the defrosting control method for the air conditioner further includes: clearing the defrosting times of the air conditioner in the conventional defrosting mode.

[0020] In this embodiment, after the outdoor fan stops, it is necessary to clear the defrosting times of the air conditioner in the conventional defrosting mode. In this way, the accuracy of judging the accumulation of frost layer at the bottom of the outdoor heat exchanger based on the defrosting times of the air conditioner in the conventional defrosting mode is improved.

[0021] Optionally, the defrosting control method for the air conditioner further includes: after the shutdown duration of the outdoor fan reaches the third set duration, controlling the air conditioner to re-enter the heating mode for operation.

[0022] In this embodiment, after the shutdown duration of the outdoor fan reaches the third set duration, that is, after the third set duration when the outdoor heat exchanger finishes defrosting, the air conditioner will be controlled to re-enter the heating mode for operation. In this way, the risk that a small amount of defrosting water remaining on the surface and bottom of the outdoor heat exchanger and not being discharged in time will condense into frost again on the outdoor heat exchanger is reduced.

[0023] Optionally, the set times are 2 to 5 times; and / or, the first temperature threshold is 0°C to 10°C; and / or, the second temperature threshold is 10°C to 35°C; and / or, the first duration is 1 min to 4 min.

[0024] In some embodiments, a control device for an air conditioner includes a processor and a memory storing program instructions. The processor is configured to execute the defrosting control method for an air conditioner as described above when running the program instructions.

[0025] In some embodiments, an air conditioner includes: an indoor unit; an outdoor unit connected to the indoor unit; and the control device for an air conditioner as described above, which is installed on the housing of the indoor unit.

[0026] The above general description and the following description are only exemplary and explanatory, and are not used to limit the present application. Description of the Drawings

[0027] One or more embodiments are exemplarily illustrated by corresponding drawings. These exemplary illustrations and the drawings do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements. The drawings do not constitute a scale limitation, and among them:

[0028] Figure 1 is a schematic diagram of an air conditioner provided by an embodiment of the present disclosure;

[0029] Figure 2 is a schematic diagram of a defrosting control method for an air conditioner provided by an embodiment of the present disclosure;

[0030] Figure 3 is a schematic diagram of another defrosting control method for an air conditioner provided by an embodiment of the present disclosure;

[0031] Figure 4 is a schematic diagram of another defrosting control method for an air conditioner provided by an embodiment of the present disclosure;

[0032] Figure 5 is a schematic diagram of a defrosting control device for an air conditioner provided by an embodiment of the present disclosure;

[0033] Figure 6 is a schematic diagram of another defrosting control device for an air conditioner provided by an embodiment of the present disclosure.

[0034] Description of the Reference Numerals in the Drawings:

[0035] 10, air conditioner; 100, indoor unit; 200, outdoor unit; 500(600), defrosting control device for an air conditioner; 501, acquisition module; 502, control module; 503, confirmation module; 601, processor; 602, memory; 603, communication interface; 604, bus. Detailed Embodiments

[0036] In order to understand the features and technical content of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for reference and illustration purposes only and are not intended to limit the embodiments of the present disclosure. In the following technical description, for the sake of explanation, numerous details are provided to give a full understanding of the disclosed embodiments. However, one or more embodiments can still be implemented without these details. In other cases, well-known structures and devices may be shown in a simplified manner to simplify the drawings.

[0037] In the description of the embodiments of the present disclosure, the terms "first", "second", etc. in the specification, claims and the above-mentioned drawings are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so as to implement the embodiments of the present disclosure described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion.

[0038] Unless otherwise specified, the term "plurality" means two or more.

[0039] In the embodiments of the present disclosure, the character " / " indicates that the objects before and after are in an "or" relationship. For example, A / B means: A or B.

[0040] The term "and / or" is a description of the association relationship of objects, indicating that there can be three relationships. For example, A and / or B means: A or B, or, A and B these three relationships.

[0041] The term "corresponding" may refer to an association relationship or a binding relationship. A corresponding to B means that there is an association relationship or a binding relationship between A and B.

[0042] It should be noted that, without conflict, the embodiments in the embodiments of the present disclosure and the features in the embodiments can be combined with each other.

[0043] In the embodiments of the present disclosure, the air conditioner can be a central air conditioner or a household air conditioner. Hereinafter, taking the air conditioner as a household air conditioner as an example, the defrosting control method for the air conditioner proposed in the embodiments of the present disclosure will be described.

[0044] As Figure 1 shown, the air conditioner 10 includes an indoor unit 100, an outdoor unit 200, and a defrosting control device 500(600) for the air conditioner.

[0045] Specifically, the defrosting control device 500(600) for the air conditioner is installed on the housing of the indoor unit 100. The outdoor unit 200 of the air conditioner 10 includes an outdoor heat exchanger and an outdoor fan, and a defrosting sensor is provided on the outdoor heat exchanger.

[0046] Optionally, the defrost sensor is disposed in a branch with the worst heat exchange effect in the liquid collector of the outdoor heat exchanger. In this way, the accuracy of detecting the surface temperature of the outdoor heat exchanger can be improved.

[0047] Optionally, the defrost control device 600 for the air conditioner includes a processor. When the air conditioner is operating in the heating mode, the processor can confirm whether the outdoor heat exchanger needs defrosting. When defrosting is required, the processor can confirm the defrosting mode to be adopted according to the number of defrosting times of the air conditioner in the conventional defrosting mode. When the number of defrosting times is greater than the set number, the processor can control the outdoor heat exchanger to perform heating defrosting, and when the surface temperature of the outdoor heat exchanger is greater than the first temperature threshold, control the outdoor fan to reverse. After controlling the outdoor fan to reverse, the processor can obtain the second temperature detected by the defrost sensor every first time period, confirm whether to control the outdoor heat exchanger to stop heating defrosting, and control the outdoor fan to stop.

[0048] Combined with the above air conditioner, the embodiments of the present disclosure provide a defrost control method for an air conditioner, as Figure 2 shown, the defrost control method includes:

[0049] S201, when the processor is operating in the heating mode of the air conditioner and confirms that the outdoor heat exchanger needs defrosting, obtain the number of defrosting times of the air conditioner in the conventional defrosting mode.

[0050] Specifically, when the air conditioner is operating in the heating mode, the surface temperature of the outdoor heat exchanger will be in a relatively low temperature range. In this case, if the outdoor ambient temperature is low and the air humidity is high, frost is likely to appear on the surface of the outdoor heat exchanger, which will cause the heat exchange effect of the outdoor heat exchanger to deteriorate. Therefore, when the air conditioner is operating in the heating mode, it is necessary to confirm whether the outdoor heat exchanger needs to be defrosted.

[0051] Specifically, the conventional defrosting mode means a defrosting mode for the outdoor heat exchanger by raising the surface temperature of the outdoor heat exchanger. For example, by starting a heating device provided on the outdoor heat exchanger to operate for a certain period of time, or guiding the high-temperature gas in the compressor chamber to the surface of the outdoor heat exchanger for a certain period of time, etc.

[0052] Specifically, since after each defrosting, a small amount of defrost water will remain on the surface and bottom of the outdoor heat exchanger. After the air conditioner resumes operation in the heating mode, this defrost water will condense into frost or ice again at the bottom of the outdoor heat exchanger. And as the number of defrosting times increases, the frost layer at the bottom of the outdoor heat exchanger will become thicker and thicker. Therefore, based on the number of defrosting times of the air conditioner in the conventional defrosting mode, the thickness of the frost layer at the bottom of the outdoor heat exchanger can be judged. Therefore, after confirming that the outdoor heat exchanger needs defrosting, the processor needs to obtain the number of defrosting times of the air conditioner in the conventional defrosting mode.

[0053] It should be noted that the defrosting times proposed in this step refer to the cumulative defrosting times in the conventional defrosting mode after the last time the outdoor fan is reversed to assist defrosting.

[0054] S202. When the defrosting times are greater than the set times, the processor controls the outdoor heat exchanger to defrost.

[0055] Specifically, if the defrosting times of the air conditioner in the conventional defrosting mode are greater than the set times, it indicates that the frost layer accumulated at the bottom of the outdoor heat exchanger is relatively thick. If the outdoor heat exchanger is still defrosted in the conventional defrosting mode this time, the frost layer at the bottom of the outdoor heat exchanger cannot be completely removed. And after this defrosting ends, if the air conditioner continues to operate in the heating mode, the frost layer at the bottom of the outdoor heat exchanger will have a relatively serious impact on the heat exchange effect of the outdoor heat exchanger. Therefore, the outdoor heat exchanger is no longer defrosted in the conventional defrosting mode this time.

[0056] Optionally, the set times are from 2 to 5 times.

[0057] S203. The processor obtains the first temperature detected by the defrosting sensor and controls the outdoor fan to reverse when the first temperature is greater than the first temperature threshold.

[0058] Specifically, after confirming that the defrosting times are greater than the set times and controlling the outdoor heat exchanger to defrost, if the first temperature detected by the defrosting sensor is greater than the first temperature threshold, it indicates that the frost layer on the surface of the outdoor heat exchanger has begun to melt. At this time, by controlling the outdoor fan to reverse, the melting speed of the frost layer at the bottom of the outdoor heat exchanger can be accelerated, and the defrosting water can be discharged more quickly, so that the accumulated frost layer at the bottom of the outdoor heat exchanger can be fully removed. Therefore, when the first temperature is greater than the first temperature threshold, the processor needs to control the outdoor fan to reverse.

[0059] It can be understood that if the first temperature is greater than the first temperature threshold, the heating defrosting of the outdoor heat exchanger will continue.

[0060] Optionally, the first temperature threshold is from 0°C to 10°C. The specific first temperature threshold can be determined according to the outdoor ambient temperature.

[0061] S204. The processor obtains the second temperature detected by the defrosting sensor every first period and controls the outdoor heat exchanger to stop heating defrosting and the outdoor fan to stop when the second temperature is greater than the second temperature threshold.

[0062] Specifically, after the duration of controlling the outdoor fan to reverse reaches the first period, it indicates that the outdoor heat exchanger has been defrosted for a relatively long time. At this time, the frost layer on the outdoor heat exchanger may have been completely removed. Therefore, the second temperature needs to be detected by the defrosting sensor every first period to determine whether the frost layer on the outdoor heat exchanger has been completely removed.

[0063] Specifically, if the second temperature is greater than the second temperature threshold, it indicates that the temperature of the outdoor heat exchanger surface is much higher than the temperature at which the frost layer melts and is also higher than the temperature at which the defrost water can remain on the outdoor heat exchanger surface. In this case, it can be determined that the frost layer on the outdoor heat exchanger has completely melted and the defrost water has been completely drained, that is, it can be determined that the frost layer on the outdoor heat exchanger has been completely removed. Therefore, when the second temperature is greater than the second temperature threshold, the processor can control the outdoor heat exchanger to stop heating for defrosting and control the outdoor fan to stop running.

[0064] Optionally, the second temperature threshold is 0°C to 35°C. The specific second temperature threshold can be determined according to the outdoor ambient temperature.

[0065] Optionally, the first duration is 1 min to 4 min.

[0066] In the embodiments of the present disclosure, when the number of defrosting times of the air conditioner in the conventional defrosting mode is greater than the set number, it indicates that the frost layer accumulated at the bottom of the outdoor heat exchanger is relatively thick. After heating and defrosting the outdoor heat exchanger to make the surface temperature of the outdoor heat exchanger (i.e., the first temperature) greater than the first temperature threshold, by controlling the outdoor fan to reverse, the melting speed of the frost layer at the bottom of the outdoor heat exchanger can be accelerated, and the defrost water can be discharged more quickly. In this way, after this defrosting is completed, the frost layer accumulated at the bottom of the outdoor heat exchanger can be completely removed, avoiding the influence of the too thick bottom frost layer on the heat exchange effect of the outdoor heat exchanger. Therefore, the embodiments of the present disclosure can reduce the risk of the deterioration of the heat exchange effect of the outdoor heat exchanger.

[0067] In addition, since the embodiments of the present disclosure can keep the outdoor heat exchanger always in a good heat exchange effect, the heating effect of the indoor unit on the room will not deteriorate, which improves the user experience. And it avoids the situation that the air conditioner needs to run for a long time to meet the user's temperature requirement for the room due to the deterioration of the heat exchange effect of the outdoor heat exchanger, which reduces the user's electricity cost and realizes energy conservation and emission reduction.

[0068] In some embodiments, heating and defrosting the outdoor heat exchanger includes: starting the heating device provided on the outdoor heat exchanger.

[0069] Specifically, a heating device is provided on the outdoor heat exchanger, which can heat the surface of the outdoor heat exchanger. Therefore, the processor can start the heating device to heat and defrost the outdoor heat exchanger.

[0070] In some embodiments, heating and defrosting the outdoor heat exchanger includes: guiding the high-temperature gas in the compressor compartment to the surface of the outdoor heat exchanger.

[0071] Specifically, the air conditioner is provided with a pipeline capable of guiding the high-temperature gas in the compressor chamber to the vicinity of the outdoor heat exchanger. The outlet of the pipeline faces the surface of the outdoor heat exchanger, and a damper is provided at the outlet of the pipeline. The processor can control the damper to blow the high-temperature gas in the compressor chamber onto the surface of the outdoor heat exchanger.

[0072] In some embodiments, heating and defrosting the outdoor heat exchanger includes: starting a heating device provided on the outdoor heat exchanger and guiding the high-temperature gas in the compressor chamber to the surface of the outdoor heat exchanger.

[0073] Specifically, while starting the heating device, blowing the high-temperature gas in the compressor chamber onto the surface of the outdoor heat exchanger can improve the efficiency of heating and defrosting the outdoor heat exchanger.

[0074] In some embodiments, the outdoor heat exchanger is confirmed whether defrosting is required in the following manner: obtaining a third temperature on the surface of the outdoor heat exchanger; when the third temperature is less than the frost point temperature and lasts for a first set duration, it is confirmed that the outdoor heat exchanger needs to be defrosted.

[0075] Specifically, the frost point temperature refers to the temperature at which water vapor in the air begins to condense into frost. The frost point temperature is calculated by the processor based on the outdoor ambient temperature and the outdoor ambient humidity.

[0076] Specifically, if the third temperature on the surface of the outdoor heat exchanger is less than the frost point temperature, it indicates that frost will appear on the surface of the outdoor heat exchanger. If the duration for which the third temperature on the surface of the outdoor heat exchanger is less than the frost point temperature reaches the first set duration, it indicates that the frost on the surface of the outdoor heat exchanger has reached a certain thickness, and the thickness of this frost layer will affect the heat exchange effect of the outdoor heat exchanger. Therefore, when the third temperature is less than the frost point temperature and lasts for the first set duration, it can be confirmed that the outdoor heat exchanger needs to be defrosted.

[0077] In some embodiments, the defrosting control method for the air conditioner further includes: when the number of defrosting times is less than or equal to the set number of times, defrosting the outdoor heat exchanger in a conventional defrosting mode; wherein, the conventional defrosting mode is to start the heating device on the outdoor heat exchanger to heat the surface of the outdoor heat exchanger for a second set duration, or to guide the high-temperature gas in the compressor chamber to the surface of the outdoor heat exchanger for a second set duration.

[0078] Specifically, if the defrosting frequency is less than or equal to the set frequency, it indicates that the frost layer accumulated at the bottom of the outdoor heat exchanger is relatively thin. If the outdoor heat exchanger is defrosted in the conventional defrosting mode this time, although the frost layer at the bottom of the outdoor heat exchanger cannot be completely removed, after the defrosting is completed this time, when the air conditioner continues to operate in the heating mode, the frost layer at the bottom of the outdoor heat exchanger will not affect the heat exchange effect of the outdoor heat exchanger. Therefore, in the above situation, the outdoor heat exchanger can be defrosted in the conventional defrosting mode.

[0079] In the embodiments of the present disclosure, when the defrosting frequency is less than or equal to the set frequency, the outdoor heat exchanger is defrosted in the conventional defrosting mode. During the defrosting process, there is no need to control the outdoor fan to reverse. Since the reverse rotation of the fan will reduce the service life of the outdoor fan and increase energy consumption. Therefore, the embodiments of the present disclosure can reduce the energy consumption during the defrosting process and improve the service life of the outdoor fan.

[0080] The embodiments of the present disclosure provide another defrosting control method for an air conditioner, as Figure 3 shown. This defrosting control method includes:

[0081] S301. When the air conditioner is operating in the heating mode and it is confirmed that the outdoor heat exchanger needs to be defrosted, the processor obtains the defrosting frequency of the air conditioner in the conventional defrosting mode.

[0082] S302. When the defrosting frequency is greater than the set frequency, the processor controls the outdoor heat exchanger to defrost.

[0083] S303. The processor obtains the first temperature detected by the defrosting sensor, and when the first temperature is greater than the first temperature threshold, controls the outdoor fan to reverse.

[0084] S304. The processor obtains the second temperature detected by the defrosting sensor at intervals of the first time period.

[0085] S305. When the second temperature is greater than the second temperature threshold, the processor controls the outdoor heat exchanger to stop heating and defrosting, and the outdoor fan to stop operating.

[0086] S306. When the second temperature is less than or equal to the second temperature threshold, the processor obtains the reverse rotation duration of the outdoor fan.

[0087] Specifically, when the second temperature is less than or equal to the second temperature threshold, it indicates that the temperature on the surface of the outdoor heat exchanger is lower than the temperature at which the frost layer completely melts. In this case, it can be determined that the frost layer on the outdoor heat exchanger has not been completely removed. And according to the reverse rotation duration of the outdoor fan, the melting duration of the frost layer on the outdoor heat exchanger can be determined. Since during the defrosting process of the outdoor heat exchanger, heating of the indoor space cannot be achieved simultaneously. To avoid excessive defrosting time of the outdoor heat exchanger resulting in too low indoor temperature. Therefore, it is necessary to obtain the reverse rotation duration of the outdoor fan to specifically judge the defrosting progress of the outdoor heat exchanger, so as to confirm whether the outdoor heat exchanger can provide good heat exchange effect if the defrosting ends at this time.

[0088] S307, when the reverse rotation duration is greater than the second duration, the processor controls the outdoor heat exchanger to stop heating and defrosting, and the outdoor fan to stop operating.

[0089] Specifically, if the reverse rotation duration of the outdoor fan is greater than the second duration, it indicates that although the frost layer on the outdoor heat exchanger has not been completely removed, but if the defrosting ends at this time, the outdoor heat exchanger can still provide good heat exchange effect. Therefore, in this case, to avoid the indoor space not being heated for a long time, the processor controls the outdoor heat exchanger to stop heating and defrosting, and controls the outdoor fan to stop operating.

[0090] Optionally, the second duration is 8 min to 12 min.

[0091] In the embodiments of the present disclosure, if the reverse rotation duration of the outdoor fan is greater than the second duration, even if the second temperature detected by the defrosting sensor obtained every first duration is not greater than the second temperature threshold, the defrosting will also stop. In this way, it avoids the indoor space not being heated for a long time, and improves the user experience on the basis of maximizing the heat exchange effect of the outdoor heat exchanger.

[0092] In some embodiments, after the outdoor fan stops operating, the defrosting control method for the air conditioner further includes: clearing the defrosting times in the conventional defrosting mode of the air conditioner.

[0093] It can be understood that after the outdoor fan stops operating, it indicates that the frost layer accumulated at the bottom of the outdoor heat exchanger has been completely removed. Therefore, the defrosting times in the conventional defrosting mode of the air conditioner can no longer reflect the situation of the frost layer accumulated at the bottom of the outdoor heat exchanger. Therefore, after the outdoor fan stops operating, it is necessary to clear the defrosting times in the conventional defrosting mode of the air conditioner. In this way, the accuracy of judging the situation of the frost layer accumulated at the bottom of the outdoor heat exchanger based on the defrosting times in the conventional defrosting mode of the air conditioner is improved.

[0094] The embodiments of the present disclosure provide another defrosting control method for an air conditioner, as Figure 4 shown, this defrosting control method includes:

[0095] S401. When the processor operates the air conditioner in the heating mode and confirms that the outdoor heat exchanger needs defrosting, it obtains the number of defrosting times of the air conditioner in the conventional defrosting mode.

[0096] S402. When the number of defrosting times is greater than the set number, the processor controls the outdoor heat exchanger to defrost.

[0097] S403. The processor obtains the first temperature detected by the defrosting sensor, and when the first temperature is greater than the first temperature threshold, it controls the outdoor fan to reverse.

[0098] S404. The processor obtains the second temperature detected by the defrosting sensor every first time period.

[0099] S405. When the second temperature is greater than the second temperature threshold, the processor controls the outdoor heat exchanger to stop heating defrosting and the outdoor fan to stop running.

[0100] S406. When the second temperature is less than or equal to the second temperature threshold, the processor obtains the reverse running time of the outdoor fan.

[0101] S407. When the reverse running time is greater than the second time period, the processor controls the outdoor heat exchanger to stop heating defrosting and the outdoor fan to stop running.

[0102] S408. After the stop running time of the outdoor fan reaches the third set time period, the processor controls the air conditioner to re-enter the heating mode operation.

[0103] Specifically, after the outdoor fan stops running, there may still be a small amount of defrosting water remaining on the surface and bottom of the outdoor heat exchanger and not being discharged in time. At this time, if the air conditioner is directly controlled to re-enter the heating mode operation, this part of the defrosting water will re-condense into frost on the surface of the outdoor heat exchanger. Therefore, after the stop running time of the outdoor fan reaches the third set time period, the processor will control the air conditioner to re-enter the heating mode operation.

[0104] In the embodiment of the present disclosure, after the stop running time of the outdoor fan reaches the third set time period, that is, after the third set time period when the outdoor heat exchanger finishes defrosting, the air conditioner is controlled to re-enter the heating mode operation. In this way, the risk that a small amount of defrosting water remaining on the surface and bottom of the outdoor heat exchanger and not being discharged in time re-condenses into frost on the outdoor heat exchanger is reduced.

[0105] Combined with Figure 5As shown in the figure, an embodiment of the present disclosure provides a defrosting control device 500 for an air conditioner, including: an acquisition module 501 and a control module 502. The acquisition module 501 is configured to acquire the defrosting times of the air conditioner in the conventional defrosting mode when the air conditioner is operating in the heating mode and it is confirmed that the outdoor heat exchanger needs defrosting. The control module 502 is configured to perform heating defrosting on the outdoor heat exchanger when the defrosting times are greater than the set times. The acquisition module 501 is further configured to acquire the first temperature detected by the defrosting sensor. The control module 502 is further configured to control the outdoor fan to reverse when the first temperature is greater than the first temperature threshold. The acquisition module 501 is further configured to acquire the second temperature detected by the defrosting sensor every first time period. The control module 502 is further configured to control the outdoor heat exchanger to stop heating defrosting and the outdoor fan to stop when the second temperature is greater than the second temperature threshold.

[0106] In some embodiments, the control module 502 is specifically configured to start the heating device provided on the outdoor heat exchanger; and / or, guide the high-temperature gas in the compressor chamber to the surface of the outdoor heat exchanger.

[0107] In some embodiments, the defrosting control device 500 for an air conditioner further includes a confirmation module 503. The acquisition module 501 is further configured to acquire the third temperature on the surface of the outdoor heat exchanger. The confirmation module 503 is configured to confirm that the outdoor heat exchanger needs defrosting when the third temperature is less than the frost point temperature and lasts for the first set time period.

[0108] In some embodiments, the control module 502 is further configured to perform defrosting on the outdoor heat exchanger in the conventional defrosting mode when the defrosting times are less than or equal to the set times; wherein, the conventional defrosting mode is to start the heating device on the outdoor heat exchanger to heat the surface of the outdoor heat exchanger for the second set time period, or, guide the high-temperature gas in the compressor chamber to the surface of the outdoor heat exchanger for the second set time period.

[0109] In some embodiments, the acquisition module 501 is further configured to acquire the reverse rotation duration of the outdoor fan when the second temperature is less than or equal to the second temperature threshold, and the control module 502 is further configured to control the outdoor heat exchanger to stop heating defrosting and the outdoor fan to stop when the reverse rotation duration is greater than the second time period.

[0110] In some embodiments, the control module 502 is further configured to clear the defrosting times of the air conditioner in the conventional defrosting mode.

[0111] In some embodiments, the control module 502 is further configured to control the air conditioner to re-enter the heating mode operation after the stop duration of the outdoor fan reaches the third set time period.

[0112] Combined with Figure 6As shown in the figure, an embodiment of the present disclosure provides a defrosting control device 600 for an air conditioner. The defrosting control device 600 for an air conditioner includes: a processor 601 and a memory 602. Optionally, the device may further include a communication interface 603 and a bus 604. Among them, the processor 601, the communication interface 603, and the memory 602 can complete mutual communication through the bus 604. The communication interface 603 can be used for information transmission. The processor 601 can call the logical instructions in the memory 602 to execute the defrosting control method for the air conditioner in the above embodiment.

[0113] In addition, when the logical instructions in the above-mentioned memory 602 are implemented in the form of a software functional unit and sold or used as an independent product, they can be stored in a computer-readable storage medium.

[0114] The memory 602, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as the program instructions / modules corresponding to the method in the embodiment of the present disclosure. The processor 601 executes functional applications and data processing by running the program instructions / modules stored in the memory 602, that is, implements the defrosting control method for the air conditioner in the above embodiment.

[0115] The memory 602 may include a program storage area and a data storage area. Among them, the program storage area can store an operating system and application programs required for at least one function; the data storage area can store data created according to the use of the terminal device, etc. In addition, the memory 602 may include a high-speed random access memory and may also include a non-volatile memory.

[0116] An embodiment of the present disclosure provides a computer-readable storage medium storing computer-executable instructions, and the computer-executable instructions are set to execute the above-mentioned defrosting control method for an air conditioner.

[0117] The technical solution of the embodiment of the present disclosure can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes one or more instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in the embodiment of the present disclosure. The foregoing storage medium may be a non-transitory storage medium, such as: a USB flash drive, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk, or an optical disc, etc., which are various media that can store program codes.

[0118] The above description and the accompanying drawings fully illustrate the embodiments of the present disclosure, enabling those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, process, and other changes. Embodiments merely represent possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terms used in this application are only for describing embodiments and do not limit the claims. As used in the description of embodiments and claims, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are intended to also include the plural forms. Similarly, as used in this application, the term "and / or" refers to any and all possible combinations including one or more of the associated listed items. Additionally, when used in this application, the term "comprise" and its variants "comprises" and / or "comprising" etc. mean the presence of the stated features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or groups of these. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, or apparatus comprising the element. Herein, each embodiment may focus on the differences from other embodiments, and the same or similar parts among the embodiments may be referred to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method parts disclosed in the embodiments, the relevant parts may refer to the description of the method parts.

[0119] Those skilled in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner may depend on the specific application and design constraints of the technical solution. The technician may use different methods for each specific application to implement the described functions, but such implementation should not be considered to exceed the scope of the embodiments of the present disclosure. The technician can clearly understand that for the convenience and conciseness of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments, and will not be elaborated herein.

[0120] In the embodiments disclosed herein, the disclosed methods, products (including but not limited to devices, equipment, etc.) can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units can be merely a logical function division. In actual implementation, there can be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Additionally, the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces. The indirect couplings or communication connections of devices or units can be in electrical, mechanical, or other forms. The units described as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to implement this embodiment. Additionally, in the embodiments of the present disclosure, the various functional units can be integrated in one processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit.

[0121] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions, and operations of systems, methods, and computer program products according to the embodiments of the present disclosure. In this regard, each block in the flowchart or block diagram can represent a module, a program segment, or a part of code that contains one or more executable instructions for implementing the specified logical function. In some alternative implementations, the functions marked in the block can occur in a different order than that marked in the accompanying drawings. For example, two consecutive blocks can actually be executed substantially in parallel, and they can sometimes be executed in the reverse order, depending on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks can also occur in a different order than that disclosed in the description. Sometimes, there is no specific order between different operations or steps. For example, two consecutive operations or steps can actually be executed substantially in parallel, and they can sometimes be executed in the reverse order, depending on the functions involved. Each block in the block diagram and / or flowchart, as well as the combination of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system for performing the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

Claims

1. A defrosting control method for an air conditioner, wherein the outdoor unit of the air conditioner includes an outdoor heat exchanger and an outdoor fan, and a defrosting sensor is arranged on the outdoor heat exchanger, characterized in that, The defrosting control method includes: When the air conditioner is operating in the heating mode and it is confirmed that the outdoor heat exchanger needs defrosting, obtain the number of defrosting times of the air conditioner in the conventional defrosting mode; When the number of defrosting times is greater than the set number, perform heating defrosting on the outdoor heat exchanger; Obtain the first temperature detected by the defrosting sensor, and when the first temperature is greater than the first temperature threshold, control the outdoor fan to rotate in reverse; Obtain the second temperature detected by the defrosting sensor every first time period, and when the second temperature is greater than the second temperature threshold, control the outdoor heat exchanger to stop heating defrosting and the outdoor fan to stop operating.

2. The defrosting control method according to claim 1, wherein Performing heating defrosting on the outdoor heat exchanger includes: Starting the heating device provided on the outdoor heat exchanger; and / or, Guiding the high-temperature gas in the compressor chamber to the surface of the outdoor heat exchanger.

3. The defrosting control method according to claim 1, wherein Confirm whether the outdoor heat exchanger needs defrosting in the following manner: Obtain the third temperature on the surface of the outdoor heat exchanger; When the third temperature is lower than the frost point temperature and lasts for the first set time period, confirm that the outdoor heat exchanger needs defrosting.

4. The defrosting control method according to any one of claims 1 to 3, characterized in that, It also includes: When the number of defrosting times is less than or equal to the set number, perform defrosting on the outdoor heat exchanger in the conventional defrosting mode; Among them, the conventional defrosting mode is to start the heating device on the outdoor heat exchanger to heat the surface of the outdoor heat exchanger for the second set time period, or to guide the high-temperature gas in the compressor chamber to the surface of the outdoor heat exchanger for the second set time period.

5. The defrosting control method according to any one of claims 1 to 3, characterized in that, After obtaining the second temperature detected by the defrosting sensor, the defrosting control method further includes: When the second temperature is less than or equal to the second temperature threshold, obtain the reverse rotation time of the outdoor fan; When the reverse rotation time is greater than the second time period, control the outdoor heat exchanger to stop heating defrosting and the outdoor fan to stop operating.

6. The defrosting control method according to claim 5, characterized in that, After the outdoor fan stops operating, the defrosting control method further includes: Clear the number of defrosting times of the air conditioner in the conventional defrosting mode.

7. The defrosting control method according to claim 5, wherein It also includes: After the stop time of the outdoor fan reaches the third set time period, control the air conditioner to re-enter the heating mode for operation.

8. The defrosting control method according to any one of claims 1 to 3, characterized in that The set number is 2 to 5 times; and / or, The first temperature threshold is 0°C to 10°C; and / or, The second temperature threshold is 10°C to 35°C; and / or, The first time period is 1 min to 4 min.

9. A control device for an air conditioner, comprising a processor and a memory storing program instructions, characterized in that, The processor is configured to execute the defrosting control method for an air conditioner according to any one of claims 1 to 8 when running the program instructions.

10. An air conditioner, characterized in that, It includes: An indoor unit; An outdoor unit, connected to the indoor unit; The control device for an air conditioner according to claim 9, installed on the housing of the indoor unit.

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