CN110469983A - Control method and device for air conditioner defrosting and air conditioner - Google Patents

Abstract

This application involves air-conditioner defrosting technical fields, disclose a kind of control method for air-conditioner defrosting.Control method includes: to obtain accumulated running time and the outdoor coil temperature of compressor in the operation of air conditioner heating mode processes；After determining satisfaction defrosting entry condition according to the accumulated running time and outdoor coil temperature, control enters reverse cycle defrosting mode and executes the first heating operation of the refrigerant to the refrigerant outlet tube road for the outdoor heat exchanger for flowing through the air-conditioning.Whether the control method can meet the judgement of defrosting entry condition according to the accumulated running time and outdoor coil temperature of the compressor acquired to air-conditioning, improve the control precision to control air-conditioner defrosting；And reverse cycle defrosting mode and by way of heating to the refrigerant for flowing through refrigerant outlet tube road, accelerate to reduce frost condensation to the adverse effect of air-conditioning itself heating performance.A kind of control device and air-conditioning for air-conditioner defrosting is also disclosed in the application.

Description

Control method and device for air conditioner defrosting and air conditioner

technical field

The present application relates to the technical field of air conditioner defrosting, for example, to a control method and device for air conditioner defrosting, and an air conditioner.

Background technique

At present, the mainstream models of air conditioners are mostly equipped with cooling and cooling dual-mode heat exchange functions. Here, when the air conditioner is in a low-temperature area or in a snowy climate, the user generally adjusts the air conditioner to the heating mode to use the air conditioner to improve the temperature. The temperature of the indoor environment; during the heating process of the air conditioner, the outdoor heat exchanger of the outdoor unit acts as an evaporator that absorbs heat from the outdoor environment. Affected by the temperature and humidity of the outdoor environment, the outdoor heat exchange It is easy to condense a lot of frost on the air conditioner, and when the frost accumulates to a certain thickness, the heating capacity of the air conditioner will become lower and lower. Therefore, in order to ensure the heating effect and avoid excessive frost condensation, it is necessary to The heat exchanger defrosts.

Here, there are mainly the following ways to defrost the outdoor heat exchanger: one is reverse cycle defrosting. When the air conditioner performs reverse cycle defrosting, the high-temperature refrigerant discharged from the compressor first flows through the outdoor heat exchanger to utilize the The heat melts the frost; the second is to add an electric heating device to the refrigerant pipeline of the air conditioner, use the electric heating device to heat the refrigerant flowing into the outdoor heat exchanger, and then use the heat of the refrigerant to melt the frost condensed on the outdoor heat exchanger; the third is to adjust the compressor, The operating parameters of air-conditioning components such as electronic expansion valves are used to change the temperature and pressure of the refrigerant in the refrigerant pipeline, so that it can also defrost the outdoor heat exchanger.

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

Since the defrosting process of the defrosting method for the outdoor heat exchanger shown in the above embodiments will more or less affect the normal heating performance of the air conditioner, the air conditioner will make a defrosting judgment before defrosting, and then According to the judgment result, whether to defrost the air conditioner is controlled; in the related art, the defrosting judgment is generally made by comparing the value between the outdoor ambient temperature and the frost point temperature, because the frosting device of the outdoor heat exchanger will be affected by the outdoor environment and the frost point temperature at the same time. Due to the influence of various factors such as its own operating status, the above-mentioned defrosting judgment method is too rough, and it is difficult to meet the needs of the air conditioner for accurately triggering the defrosting action.

Contents of the invention

In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is presented below. The summary is not intended to be an extensive overview nor to identify key/important elements or to delineate the scope of these embodiments, but rather serves as a prelude to the detailed description that follows.

Embodiments of the present disclosure provide a control method and device for defrosting an air conditioner, and an air conditioner, so as to solve the technical problem of low accuracy in judging the defrosting of an air conditioner in the related art.

In some embodiments, the control method for air conditioner defrosting includes:

During the heating mode of the air conditioner, the accumulative running time of the compressor and the temperature of the outdoor coil are obtained;

After determining that the defrosting entry condition is met according to the accumulated running time and the outdoor coil temperature, the control enters the reverse cycle defrosting mode and executes the first refrigerant flow through the refrigerant outlet pipeline of the outdoor heat exchanger of the air conditioner. Heating operation.

In some embodiments, the control device for air conditioner defrosting includes:

A processor and a memory storing program instructions, the processor is configured to, when executing the program instructions, execute the control method for air conditioner defrosting as described in some of the above embodiments.

In some embodiments, the air conditioner includes:

Refrigerant circulation circuit is composed of outdoor heat exchanger, indoor heat exchanger, throttling device and compressor connected by refrigerant pipeline;

The heating device is arranged on the refrigerant outlet pipeline of the outdoor heat exchanger in the heating mode, and is configured to heat the refrigerant flowing through the refrigerant outlet pipeline;

The control device for air conditioner defrosting as described in some of the above embodiments is electrically connected to the heating device.

The control method, device and air conditioner for air conditioner defrosting provided by the embodiments of the present disclosure can achieve the following technical effects:

The control method for air conditioner defrosting provided by the embodiments of the present disclosure can comprehensively judge whether the air conditioner satisfies the defrosting entry condition based on the acquired cumulative running time of the compressor and the temperature of the outdoor coil, thereby effectively improving The control accuracy of the defrosting of the air conditioner is controlled; and the high-temperature refrigerant is used to defrost the outdoor heat exchanger through the reverse cycle defrosting mode, and the refrigerant flowing through the refrigerant outlet pipeline is further improved by heating the refrigerant flowing into the outdoor heat exchanger in the reverse cycle mode. The refrigerant temperature of the heater can effectively improve the defrosting efficiency of the outdoor heat exchanger, and accelerate the reduction of the adverse effect of frost condensation on the heating performance of the air conditioner itself.

The foregoing general description and the following description are exemplary and explanatory only and are not intended to limit the application.

Description of drawings

One or more embodiments are exemplified by the corresponding drawings, and these exemplifications and drawings do not constitute a limitation to the embodiments, and elements with the same reference numerals in the drawings are shown as similar elements, The drawings are not limited to scale and in which:

FIG. 1 is a schematic flow chart of a control method for defrosting an air conditioner provided by an embodiment of the present disclosure;

Fig. 2 is a schematic flowchart of a control method for air conditioner defrosting provided by another embodiment of the present disclosure;

Fig. 3 is a schematic structural diagram of a control device for defrosting an air conditioner provided by an embodiment of the present disclosure;

Fig. 4 is a schematic structural diagram of an air conditioner provided by an embodiment of the present disclosure.

Detailed ways

In order to understand the characteristics 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 in conjunction with the accompanying drawings. The attached drawings are only for reference and description, and are not intended to limit the embodiments of the present disclosure. In the following technical description, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown simplified in order to simplify the drawings.

Fig. 1 is a schematic flowchart of a control method for defrosting an air conditioner provided by an embodiment of the present disclosure.

As shown in Figure 1, the embodiment of the present disclosure provides a control method for air conditioner defrosting, which can be used to solve the problem of frosting on the outdoor heat exchanger and affecting the normal operation of the air conditioner when the air conditioner is running in rainy, snowy or low temperature conditions. The problem of thermal performance; In an embodiment, the main flow steps of the control method include:

S101. Acquiring the accumulative running time of the compressor and the temperature of the outdoor coil during the heating mode of the air conditioner;

In the embodiment, when frosting occurs on the outdoor heat exchanger of the outdoor unit of the air conditioner, the outdoor environment is usually in a bad working condition with low temperature and high humidity. At this time, the user generally sets the air conditioner to operate in the heating mode , to use the air conditioner to heat up the indoor environment. Therefore, the control method for defrosting the air conditioner provided by the embodiments of the present disclosure is a control process activated when the air conditioner is running in the heating mode.

When the air conditioner is running in other modes such as cooling mode, dehumidification mode, etc., since the outdoor working conditions corresponding to these modes generally do not have the problem of frosting on the outdoor unit of the air conditioner, it is optional, when the air conditioner is running in other non-heating modes In this case, the flow control process corresponding to this control method is not enabled, so as to prevent the air conditioner from accidentally triggering the defrosting action for the outdoor heat exchanger in cooling mode, dehumidification mode, etc., and affecting the normal cooling or dehumidification work process of the air conditioner.

In an optional embodiment, the air conditioner is provided with a timing module. During a single operation of the air conditioner, when the compressor starts running, the timing module starts timing, and when the compressor stops running, the timing module stops timing; therefore, The accumulative running time acquired in step S101 may be the timing duration obtained through the statistics of the timing module;

Here, when the air conditioner is turned off, the timing duration counted by the timing module is cleared.

In the embodiment of the present disclosure, as the operating time of the air conditioner compressor increases, the heat exchange time between the outdoor heat exchanger of the air conditioner and the outdoor environment also increases, which also corresponds to the fact that the outdoor heat exchanger itself is prone to frost condensation duration of low temperature conditions. The longer the duration, the greater the possibility of frost condensation on the outdoor heat exchanger and the thicker the frost thickness; and the shorter the duration, the smaller the possibility of frost condensation on the outdoor heat exchanger and the thinner the frost thickness; therefore, this Apply to use the cumulative running time of the compressor as a reference factor for judging whether there may be frosting in the outdoor heat exchanger.

In an optional embodiment, a first temperature sensor is provided at the coil position of the outdoor heat exchanger of the outdoor unit of the air conditioner, and the first temperature sensor can be used to detect the real-time temperature of the coil position; therefore, in step S101 The outdoor coil temperature acquired in may be the real-time temperature at the position of the coil detected by the first temperature sensor.

In the embodiment of the present disclosure, the temperature change of the coil position of the outdoor heat exchanger can intuitively reflect the temperature change of the refrigerant pipeline of the outdoor heat exchanger under the joint influence of the external outdoor ambient temperature and the internal refrigerant temperature. In addition, it is generally the pipeline part where the outdoor heat exchanger is prone to frosting; therefore, the obtained outdoor coil temperature can be used as a reference factor to measure the frosting effect of the air conditioner on the outdoor heat exchanger.

S102. After determining that the defrosting entry condition is satisfied according to the accumulated running time and the outdoor coil temperature, control enters the reverse cycle defrosting mode and performs the first heating operation for the refrigerant flowing through the refrigerant outlet line of the outdoor heat exchanger of the air conditioner .

Here, the air conditioner presets a defrosting entry condition. When the air conditioner is running in the heating mode, it can be judged whether the air conditioner meets the defrosting entry condition according to the obtained parameters; if it is satisfied, the air conditioner needs to defrost the outdoor heat exchanger. frost; if not, the air conditioner does not need to defrost the outdoor heat exchanger.

In the embodiment of the present disclosure, the air conditioner judges whether the defrosting entry condition is satisfied according to the parameters such as the accumulated running time of the compressor and the temperature of the outdoor coil acquired in step S101; the accumulated running time of the compressor can reflect The temperature of the outdoor coil can more sensitively reflect the temperature change of the outdoor heat exchanger under the influence of the outdoor ambient temperature when the possibility of frost condensation in the air conditioner is greater. Judging whether there is a frosting problem can greatly improve the accuracy of judging the defrosting of the air conditioner, so that the defrosting operation triggered by the air conditioner can be more in line with the real-time frosting situation of the air conditioner.

In an optional embodiment, the defrosting entry conditions in step S102 include:

t _im ≥ t _threshold , T _e ≤ T frost _condensation , T _emax -T _e ≥ △T1, and T _{out of liquid} - T _e ≤ △T2;

Among them, t _im is the cumulative running time of the compressor, t _{threshold is} the preset time threshold, T _e is the temperature of the outdoor coil, T _{frost is the critical frost temperature of the current working condition, and T emax is} the current start-up operation of the air conditioner The maximum value of the outdoor coil temperature recorded last, T _outlet is the refrigerant outlet temperature of the refrigerant flowing through the refrigerant outlet pipeline of the outdoor heat exchanger in heating mode, △T1 is the preset first temperature difference threshold, ΔT2 is a preset second temperature difference threshold.

In this defrosting condition, the temperature difference between the outdoor coil temperature and the maximum outdoor coil temperature can reflect the temperature change of the outdoor coil itself under the influence of the internal and external environment of the air conditioner; , When the air conditioner is in normal operation, the temperature of the outdoor coil has a limited variation compared with the maximum value of the outdoor coil temperature; and when the outdoor environment becomes a bad working condition that easily causes frost on the outdoor heat exchanger, it is affected by Influenced by the change of outdoor ambient temperature, the temperature of the outdoor coil drops rapidly, so that the variation of the maximum value of the temperature of the outdoor coil will also fluctuate greatly; thus, one of the entry conditions for defrosting in this application is The defrosting judgment is made according to the temperature of the outdoor coil under different outdoor working conditions.

When setting this type of defrosting entry condition, step S101 also includes acquiring the outlet temperature of the refrigerant.

In an optional embodiment, the outdoor unit of the air conditioner is also provided with a second temperature sensor, which can be used to detect the real-time temperature of the refrigerant flowing through the refrigerant outlet pipeline of the outdoor heat exchanger; therefore, in The refrigerant outlet pipeline acquired in step S101 may be the real-time temperature of the refrigerant detected by the second temperature sensor;

Here, the refrigerant outlet pipeline is a pipeline through which the refrigerant flows out of the outdoor heat exchanger when the air conditioner operates in a heating mode.

In the embodiment of the present disclosure, the temperature of the refrigerant flowing out of the outdoor heat exchanger can reflect the heat exchange efficiency between the outdoor heat exchanger and the outdoor environment, and the heat exchange efficiency will be affected by the frosting degree of the outdoor heat exchanger; Here, when the frosting degree of the air conditioner is low and the thickness of the frost is thin, the impact of frost on heat exchange is small, and the refrigerant flowing through the outdoor heat exchanger absorbs more heat; When the temperature is high and the frost thickness is thick, the frost has a greater impact on heat exchange, and the heat absorbed by the refrigerant flowing through the outdoor heat exchanger is less. Therefore, the obtained refrigerant outlet temperature can be used as a reference factor to measure the frosting degree of the air conditioner heat exchanger.

In addition, when the air conditioner has the problem of frosting, due to the barrier of the frost layer, the heat exchange efficiency between the outdoor heat exchanger and the outdoor environment is reduced. At this time, the temperature of the refrigerant is the main factor affecting the temperature of the outdoor coil. When the temperature difference between the temperature and the outdoor coil temperature is small, it means that there may be frosting in the outdoor heat exchanger of the air conditioner at this time.

Therefore, the defrosting entry conditions in the embodiments of the present disclosure comprehensively consider the influence of parameters on the frosting of the outdoor heat exchanger under different working conditions, which can effectively improve the judgment accuracy of the air conditioner defrosting, and reduce misjudgment, false triggering and other problems appear.

In the embodiment of the present disclosure, when it is determined according to the accumulated running time of the compressor and the temperature of the outdoor coil that the defrosting entry condition is met, the defrosting operation of the air conditioner includes controlling the entry into the reverse cycle defrosting mode and performing convection of outdoor heat exchange through the air conditioner The first heating operation of the refrigerant in the refrigerant outlet pipeline of the device.

Among them, the reverse cycle defrosting mode includes controlling the refrigerant flow direction of the air conditioner to switch to the opposite direction of the heating mode; in this mode, the high-temperature refrigerant discharged by the compressor first flows through the outdoor heat exchanger, so that the high-temperature refrigerant can be used The heat to achieve the defrosting operation of the outdoor heat exchanger.

At the same time, in the reverse cycle mode, the refrigerant outlet pipe in the heating mode essentially becomes a "refrigerant inlet pipe", that is, the refrigerant flows into the outdoor heat exchanger through the refrigerant outlet pipe in the cooling mode. Therefore, by heating the refrigerant flowing through the refrigerant outlet pipeline, the temperature of the refrigerant flowing into the indoor heat exchanger can be further increased, thereby enhancing the actual defrosting effect.

Optionally, a heating device is provided at the refrigerant outlet pipeline of the outdoor heat exchanger, and the heating device is configured to controllably heat the refrigerant flowing through the refrigerant outlet pipeline.

Therefore, in step S102, after determining that the defrosting entry condition is met according to the accumulated running time of the compressor and the outdoor coil temperature, the reverse cycle defrosting mode can be controlled to run and the heating device is turned on to perform the first heating operation; If the accumulative running time of the machine and the temperature of the outdoor coil determine that the defrosting entry condition is not met, then keep the heating mode unchanged and keep the heating device in the off state.

In one embodiment, the heating device is an electromagnetic heating device. The electromagnetic heating device uses the principle of electromagnetic induction heating to heat the refrigerant pipeline, and then uses the refrigerant pipeline to transfer heat to the refrigerant flowing through the refrigerant pipeline to achieve the purpose of heating the refrigerant. Purpose.

Here, the refrigerant pipeline section heated by the electromagnetic heating device is a metal pipe section such as copper or iron. The electromagnetic heating device is mainly composed of an induction coil and a power supply module. Here, the induction coil is wound on the above-mentioned refrigerant pipeline section, and the power supply module It can provide alternating current for the induction coil; when the induction coil is energized, the alternating current flowing through the induction coil generates an alternating magnetic field passing through the refrigerant pipe section, which will cause eddy currents to be generated inside the refrigerant pipe section, so that these eddy currents can be relied on The energy plays the role of heating up.

It should be understood that the type of the heating device used to heat the refrigerant in the present application is not limited to the above-mentioned electromagnetic heating device, and other types of heating devices in the related art that can be used to directly or indirectly heat the refrigerant can also apply the technical solution of the present application. And covered within the scope of protection of this application.

In an optional embodiment, when controlling the first heating operation on the refrigerant outlet pipeline in step S102, the heating operation of the first heating operation can be determined according to the time difference or temperature difference, and then executed according to the heating operation The first heating operation.

Among them, the time difference includes: the time difference between the accumulated running time of the compressor and the time threshold; the temperature difference includes: the first temperature difference between the maximum outdoor coil temperature and the outdoor coil temperature, the condensation The second temperature difference between the frost critical temperature and the outdoor coil temperature, or the third temperature difference between the refrigerant outlet liquid temperature and the outdoor coil temperature; the heating parameters include the heating rate of the first heating operation and/or Heating time.

In the technical content above, the time difference and temperature difference are respectively used to judge one of the sub-conditions of the defrosting entry condition; therefore, when it is determined in step S102 that the defrosting entry condition is met, the time difference can be Or the temperature difference to estimate the degree of frosting of the outdoor heat exchanger, and then select the heating rate and heating time for the refrigerant flowing through the refrigerant outlet pipeline according to the degree of frosting.

For example, when the degree of frosting on the outdoor heat exchanger is high, the heating performance of the air conditioner will be greatly attenuated, and the heating rate of the refrigerant should be set to be faster to increase the heating rate of the outflowing refrigerant so that it can be cooled as quickly as possible. Meet the return air temperature requirements; and set the heating time for the refrigerant to be longer, so that the refrigerant flowing out of the outdoor heat exchanger and back to the compressor can be heated for a long time when the outdoor heat exchanger is severely frosted; When the frosting degree of the outdoor heat exchanger is low, the heating rate of the refrigerant is set to be low and the heating time is short, so as to reduce the power consumption of the first heating device and reduce the use cost of the air conditioner.

Optionally, determining the heating rate of the refrigerant flowing through the refrigerant outlet pipeline according to the temperature difference includes: obtaining the corresponding first heating rate from the first rate correlation according to the time difference, so as to obtain the corresponding first heating rate according to the first heating rate for heating.

Here, the first rate correlation includes correspondences between one or more time difference values and the first heating rate. Here, Table 1 shows an optional correspondence between the time difference and the first heating rate, as shown in the following table,

Time difference (unit: min) The first heating rate (unit: ℃/min) △t11<t_im-t_threshold≤△t12 v11 △t12<t_im-t_threshold≤△t13 v12 △t13<t_im-t_threshold v13

Table 1

In the first rate correlation, the first heating rate is positively correlated with the time difference. That is, the larger the time difference, the higher the first heating rate; and the smaller the time difference, the lower the first heating rate.

Therefore, when performing the heating operation on the refrigerant flowing through the refrigerant outlet pipeline in step S102, the first heating rate corresponding to the time difference can be determined first according to the first rate correlation, and then the heating is performed according to the first heating rate.

Still another option, determining the heating rate of the refrigerant flowing through the refrigerant outlet pipeline according to the temperature difference includes: obtaining the corresponding second heating rate from the second rate correlation according to the first temperature difference, so as to follow the Heating is performed at a second heating rate.

Here, the second rate correlation includes one or more correspondences between the first temperature difference and the second heating rate. Here, Table 2 shows an optional correspondence between the first temperature difference and the second heating rate, as shown in the following table,

The first temperature difference (unit: ℃) The second heating rate (unit: ℃/min) a1<T_emax-T_e≤a2 v21 a2<T_emax-T_e≤a3 v22 a3<T_emax-T_e v23

Table 2

In the second rate correlation, the second heating rate is positively correlated with the first temperature difference. That is, the larger the first temperature difference, the higher the second heating rate; and the smaller the first temperature difference, the lower the second heating rate.

Therefore, when performing the heating operation on the refrigerant flowing through the refrigerant outlet pipeline in step S102, the second heating rate corresponding to the first temperature difference can be determined first according to the second rate correlation, and then the second heating rate can be determined according to the second heating rate. heating.

Still another option, determining the heating rate of the refrigerant flowing through the refrigerant outlet pipeline according to the temperature difference includes: obtaining the corresponding third heating rate from the third rate correlation according to the second temperature difference, so as to follow Heating is performed at a third heating rate.

Here, the third rate correlation includes one or more correspondences between the second temperature difference and the third heating rate. Here, Table 3 shows an optional correspondence between the second temperature difference and the third heating rate, as shown in the following table,

The second temperature difference (unit: ℃) The third heating rate (unit: ℃/min) b1<T_cream-T_e≤b2 v31 b2<T_cream-T_e≤b3 v32 b3<T_Frost-T_e v33

table 3

In the third rate correlation, the third heating rate is positively correlated with the second temperature difference. That is, the larger the second temperature difference, the higher the third heating rate; and the smaller the second temperature difference, the lower the third heating rate.

Therefore, when performing the heating operation on the refrigerant flowing through the refrigerant outlet pipeline in step S102, the third heating rate corresponding to the second temperature difference can be determined first according to the third rate correlation, and then the third heating rate can be determined according to the third heating rate. heating.

Still another option, determining the heating rate of the refrigerant flowing through the refrigerant outlet pipeline according to the temperature difference includes: obtaining the corresponding fourth heating rate from the fourth rate correlation according to the third temperature difference, so as to follow the A fourth heating rate is used for heating.

Here, the fourth rate correlation includes one or more correspondences between the third temperature difference and the fourth heating rate. Here, Table 4 shows an optional correspondence between the third temperature difference and the fourth heating rate, as shown in the following table,

The third temperature difference (unit: ℃) The fourth heating rate (unit: ℃/min) c1<T_liquid-T_e≤c2 v41 c2<T_liquid-T_e≤c3 v42 c3<T_exhaust-T_e v43

Table 4

In the fourth rate correlation, the fourth heating rate is negatively correlated with the third temperature difference. That is, the larger the third temperature difference, the lower the fourth heating rate; and the smaller the third temperature difference, the higher the fourth heating rate.

Therefore, when performing the heating operation on the refrigerant flowing through the refrigerant outlet pipeline in step S102, the fourth heating rate corresponding to the third temperature difference can be determined first according to the fourth rate correlation, and then the fourth heating rate can be determined according to the fourth heating rate. heating.

In the above-mentioned embodiments, since the accumulative running time of the compressor corresponding to the degree of frosting of the outdoor heat exchanger is different, and at the same time, its influence on the temperature change of the outdoor coil and the temperature change of the refrigerant inlet and outlet liquid is different, so this Each application is set with a separate relationship, and the air conditioner can select one of the relationships to determine the corresponding heating rate according to actual needs.

Optionally, the specifically selected rate correlation relationship can be determined according to the heating demand of the current user. For example, when the heating demand of the current user is low, the first rate correlation relationship, the second rate correlation relationship and the third rate correlation relationship are selected. At this time, it is mainly the influence of the operating status of the outdoor unit components (compressor or outdoor coil) on the defrosting effect; and when the heating demand of the current user is high, the fourth rate correlation is selected. At this time, the main It is to consider the impact of the frosting of the outdoor heat exchanger on the refrigerant outlet liquid temperature, which can reflect the temperature of the refrigerant returning to the compressor, so that the heated refrigerant can also increase the return air temperature of the refrigerant to ensure the heating performance.

Here, the heating demand of the current user can be determined by the target heating temperature set by the air conditioner; for example, the air conditioner has a preset heating temperature threshold, when the target heating temperature actually set by the user is , it indicates that the heating demand of the user is low at this time; and when the target heating temperature actually set by the user is greater than or equal to the heating temperature threshold, it indicates that the heating demand of the user is high or low at this time.

In this way, the embodiment of the present disclosure can not only trigger the defrosting operation of the air conditioner for the outdoor heat exchanger in time according to the actual frosting condition of the air conditioner, but also take into account the heating demand of the user when performing the defrosting operation for heating the refrigerant , so as to fully guarantee the control requirements of the air conditioner for the comfort of the user during the defrosting process.

Similarly, in some optional embodiments, it is also possible to determine the heating duration of the refrigerant flowing through the refrigerant outlet pipeline according to the time difference, including: according to the time difference, obtain the corresponding first duration correlation relationship A heating duration, for heating according to the first heating duration.

Here, in the first duration correlation, the first heating duration is positively correlated with the time difference.

Or, according to the first temperature difference, the corresponding second heating duration is acquired from the second duration correlation, so as to perform heating according to the second heating duration.

Here, in the second duration correlation, the second heating duration is positively correlated with the first temperature difference.

Or, according to the second temperature difference, the corresponding third heating time length is obtained from the third time length correlation, so as to perform heating according to the third heating time length.

Here, in the third duration correlation, the third heating duration is positively correlated with the second temperature difference.

Or, according to the third temperature difference, the corresponding fourth heating duration is obtained from the fourth duration correlation, so as to perform heating according to the fourth heating duration.

Here, in the fourth duration correlation, the fourth heating duration is negatively correlated with the third temperature difference.

In the above embodiment, the manner of obtaining the heating duration according to the time difference or the temperature difference may refer to the above-mentioned control flow for obtaining the heating rate according to the temperature difference, and details are not repeated here.

In some optional embodiments, in order to improve the heating performance of the air conditioner as soon as possible when the air conditioner is turned on, the steps of the control method of the present application further include: after the air conditioner is turned on in the heating mode, control the execution of the outdoor heat exchange that flows through the air conditioner. The second heating operation of the refrigerant in the refrigerant outlet pipeline of the device.

At this time, the refrigerant flows out of the outdoor heat exchanger through the refrigerant outlet pipeline and returns to the compressor. Therefore, the second heating operation can increase the return air temperature of the refrigerant returning to the compressor, thereby improving the heating performance of the air conditioner during the start-up phase. performance.

Optionally, after controlling to perform the second heating operation, the present application further includes: obtaining the return air temperature of the compressor of the air conditioner; when the return air temperature of the compressor meets the preset temperature rise condition, controlling to stop the second heating operation .

In this embodiment, the return air end of the air conditioner compressor is also provided with a temperature sensor, which can be used to detect the temperature of the refrigerant flowing through the return air end; therefore, the real-time detected refrigerant temperature can be obtained through the temperature sensor and used as a The return air temperature is used to judge the temperature rise condition.

In an optional embodiment, the temperature rise condition includes: the return air temperature is greater than or equal to a preset return air temperature threshold.

Here, when the return air temperature is greater than or equal to the preset return air temperature threshold, it means that the heating performance of the air conditioner at this time can meet the current heating demand, and the second heating operation can be controlled to stop. In the case of heat demand, the power consumption of the second heating operation can be reduced; and in the case that the return air temperature is lower than the preset return air temperature threshold, it means that the heating performance of the air conditioner has not yet met the current heating demand, so Keep the second heating operation unchanged.

Fig. 2 is a schematic flowchart of a control method for defrosting an air conditioner provided by another embodiment of the present disclosure.

As shown in FIG. 2 , the embodiment of the present disclosure provides another control method for air conditioner defrosting, and the control steps mainly include:

S201. Turn on the air conditioner and run in heating mode;

In this embodiment, the air conditioner generally starts to run in the current mode with the heating mode set by the user under low temperature and severe cold weather conditions.

S202, controlling to start the second heating operation of the heating device;

In the embodiment of the present disclosure, the heating device is arranged on the refrigerant outlet pipeline of the outdoor heat exchanger in the heating mode, and is configured to heat the refrigerant flowing through the refrigerant outlet pipeline.

Optionally, the air conditioner is preset with configuration information such as the heating rate of the second heating operation, so in step S202, the air conditioner can call the preset configuration information, and control the execution of the second heating operation according to the configuration information;

S203. Obtain the return air temperature of the compressor;

S204, judging whether T _return air≥T _{return air threshold} , if yes, execute step S205, if not, return to execute step S203;

S205. Stop performing the second heating operation;

S206. Detecting the refrigerant outlet temperature T _outlet , the accumulative running time t _im of the compressor, and the outdoor coil temperature T _e ;

S207. Judging whether t _im ≥ t _threshold , T _e ≤ T _frosting , T _emax -T _e ≥ △T1, and T _{out of liquid} - T _e ≤ △T2, if yes, execute step S208, if not, return Execute step S206;

In the embodiment of the present disclosure, t _im ≥ t _threshold , T _e ≤ T frost _condensation , T _emax -T _e ≥ ΔT1, and T _{out of liquid} - T _e ≤ ΔT2 together constitute a preset defrosting entry condition.

Here, after the air conditioner is turned on and running, the temperature sensor detects the temperature of the upper casing in real time, and saves the detected temperatures of multiple upper casings as historical data; therefore, when the judgment step of step S207 is performed, the A plurality of upper casing temperatures, and determine the upper casing temperature maximum T _{upper casing max} by comparison;

If the entry condition for defrosting is satisfied, it means that the outdoor heat exchanger of the air conditioner has a frosting problem at this time; and if the entry condition for defrosting is not met, it means that the outdoor heat exchanger for the air conditioner does not have a frosting problem at this time.

S208. Acquire the corresponding first heating rate from the first rate correlation according to the t _im -t _threshold ;

S209. Acquire the corresponding first heating duration from the first duration correlation according to the t _im -t _threshold ;

S210, control to enter the reverse cycle defrosting mode, and turn on the heating device according to the first heating rate and the first heating duration;

Optionally, the heating device is an electromagnetic heating device, so the adjustment of the first heating rate can be realized by changing parameters such as operating current or voltage of the electromagnetic heating device.

The control method for air conditioner defrosting provided by the embodiments of the present disclosure can comprehensively judge whether the air conditioner satisfies the entry condition for defrosting according to the obtained parameters such as the accumulated running time of the compressor and the temperature of the outdoor coil, thereby effectively improving the control The control accuracy of air conditioner defrosting; and through the reverse cycle defrosting mode, the high temperature refrigerant is used to defrost the outdoor heat exchanger, and the way of heating the refrigerant flowing through the refrigerant outlet pipeline is further improved. The temperature of the refrigerant can effectively improve the defrosting efficiency of the outdoor heat exchanger, and accelerate the reduction of the adverse effects of frost condensation on the heating performance of the air conditioner itself.

4. The control method according to claim 3, characterized in that determining the heating rate of the refrigerant flowing through the refrigerant inlet pipeline according to the time difference comprises:

According to the time difference, the corresponding first heating rate is obtained from the first rate correlation, so as to perform heating according to the first heating rate.

5. The control method according to claim 3, characterized in that determining the heating rate of the refrigerant flowing through the refrigerant inlet pipeline according to the temperature difference comprises:

Obtain a corresponding second heating rate from the second rate correlation according to the first temperature difference, so as to perform heating according to the second heating rate; or,

Obtain a corresponding third heating rate from the third rate correlation according to the second temperature difference, so as to perform heating according to the third heating rate; or,

According to the third temperature difference, the corresponding fourth heating rate is obtained from the fourth rate correlation, so as to perform heating according to the fourth heating rate.

6. The control method according to claim 3, characterized in that the heating duration of the refrigerant flowing through the refrigerant inlet pipeline is determined according to the time difference, including:

According to the time difference, the corresponding first heating duration is obtained from the first duration correlation, so as to perform heating according to the first heating duration.

7. The control method according to claim 3, characterized in that the heating duration of the refrigerant flowing through the refrigerant inlet pipeline is determined according to the temperature difference, including:

According to the first temperature difference, the corresponding second heating duration is obtained from the second duration correlation, so as to perform heating according to the second heating duration; or,

According to the second temperature difference, the corresponding third heating duration is obtained from the third duration correlation, so as to perform heating according to the third heating duration; or,

According to the third temperature difference, the corresponding fourth heating duration is obtained from the fourth duration correlation, so as to perform heating according to the fourth heating duration.

Fig. 3 is a schematic structural diagram of a control device for defrosting an air conditioner provided by an embodiment of the present disclosure.

An embodiment of the present disclosure provides a control device for defrosting an air conditioner, the structure of which is shown in FIG. 3 , including:

A processor (processor) 300 and a memory (memory) 301 may also include a communication interface (Communication Interface) 302 and a bus 303 . Wherein, the processor 300 , the communication interface 302 , and the memory 301 can communicate with each other through the bus 303 . The communication interface 302 can be used for information transmission. The processor 300 can call the logic instructions in the memory 301 to execute the control method for air conditioner defrosting in the above embodiments.

In addition, the above logic instructions in the memory 301 may be implemented in the form of software functional units and may be stored in a computer-readable storage medium when sold or used as an independent product.

The memory 301, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as program instructions/modules corresponding to the methods in the embodiments of the present disclosure. The processor 300 executes function applications and data processing by running the program instructions/modules stored in the memory 301 , that is, implements the control method for air conditioner defrosting in the above method embodiments.

The memory 301 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and an application program required by at least one function; the data storage area may store data created according to the use of the terminal device, and the like. In addition, the memory 301 may include a high-speed random access memory, and may also include a non-volatile memory.

Fig. 4 is a schematic structural diagram of an air conditioner provided by an embodiment of the present disclosure.

As shown in Figure 4, the implementation of the present disclosure also provides an air conditioner, including:

The refrigerant circulation circuit is composed of an outdoor heat exchanger 41, an indoor heat exchanger 42, a throttling device 43 and a compressor 44 connected through refrigerant pipelines;

The heating device 45 is arranged on the refrigerant outlet pipeline of the outdoor heat exchanger 41 in the heating mode, and is configured to heat the refrigerant flowing through the refrigerant outlet pipeline;

The control device 46 for defrosting the air conditioner is electrically connected with the heating device 45 . Here, the control device for defrosting the air conditioner is the control device shown in the previous embodiments.

The air conditioner in the embodiments of the present disclosure can accurately detect and judge whether the air conditioner has a frosting problem, and if the air conditioner has a frosting problem, use the above-mentioned control device and heating device to perform corresponding defrosting operations, so as to reduce the number of outdoor air conditioners. The amount of frost condensed on the heat exchanger ensures that the air conditioner can normally heat the indoor environment under low temperature and severe cold weather conditions, and improves the user experience.

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

An embodiment of the present disclosure also provides a computer program product. The computer program product includes a computer program stored on a computer-readable storage medium. The computer program includes program instructions. Method of defrosting.

The above-mentioned computer-readable storage medium may be a transitory computer-readable storage medium, or a non-transitory computer-readable storage medium.

The technical solutions of the embodiments of the present disclosure can be embodied in the form of software products, which are stored in a storage medium and include one or more instructions to make a computer device (which can be a personal computer, a server, or a network equipment, etc.) to perform all or part of the steps of the method described in the embodiments of the present disclosure. The aforementioned storage medium can be a non-transitory storage medium, including: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disk, etc. A medium that can store program code, or a transitory storage medium.

The above description and drawings sufficiently illustrate the embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, procedural, and other changes. The examples merely represent possible variations. Individual components and functions are optional unless explicitly required, and the order of operations may vary. Portions and features of some embodiments may be included in or substituted for those of other embodiments. The scope of embodiments of the present disclosure includes the full scope of the claims, and all available equivalents of the claims. When used in the present application, although the terms 'first', 'second', etc. may be used in the present application to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, without changing the meaning of the description, a first element could be called a second element, and likewise, a second element could be called a first element, as long as all occurrences of "first element" are renamed consistently and all occurrences of "Second component" can be renamed consistently. The first element and the second element are both elements, but may not be the same element. Also, the terms used in the present application are used to describe the embodiments only and are not used to limit the claims. As used in the examples and description of the claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well unless the context clearly indicates otherwise . Similarly, the term "and/or" as used in this application is meant to include any and all possible combinations of one or more of the associated listed ones. Additionally, when used in this application, the term "comprise" and its variants "comprises" and/or comprising (comprising) etc. refer to stated features, integers, steps, operations, elements, and/or The presence of a component does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and/or groupings of these. Without further limitations, an element defined by the statement "comprising a ..." does not exclude the presence of additional identical elements in the process, method or apparatus comprising said element. Herein, what each embodiment focuses on may be the difference from other embodiments, and the same and similar parts of the various embodiments may refer to each other. For the method, product, etc. disclosed in the embodiment, if it corresponds to the method part disclosed in the embodiment, then the relevant part can refer to the description of the method part.

Those skilled in the art can appreciate that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed by hardware or software may depend on the specific application and design constraints of the technical solution. Said artisans may implement the described functions using different methods for each particular application, but such implementation should not be regarded as exceeding the scope of the disclosed embodiments. The skilled person can clearly understand that for the convenience and brevity of the description, the specific working process of the above-described system, device and unit can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

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

The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to embodiments of the disclosure. In this regard, each block in a flowchart or block diagram may represent a module, program segment, or part of code that includes one or more Executable instructions. In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks in succession may, in fact, be executed substantially concurrently, or they may sometimes be executed in the reverse order, depending upon the functionality involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks may also occur in a different order than that disclosed in the description, and sometimes there is no specific agreement between different operations or steps. order. For example, two consecutive operations or steps may, in fact, be performed substantially concurrently, or they may sometimes be performed in the reverse order, depending upon the functionality involved. Each block in the block diagrams and/or flowcharts, and combinations of blocks in the block diagrams and/or flowcharts, can be implemented by a dedicated hardware-based system that performs the specified function or action, or can be implemented by dedicated hardware implemented in combination with computer instructions.

Claims (11)

1. A control method for air-conditioning defrosting, characterized in that, comprising: During the heating mode of the air conditioner, the accumulative running time of the compressor and the temperature of the outdoor coil are acquired; After determining that the defrosting entry condition is met according to the accumulated running time and the outdoor coil temperature, the control enters the reverse cycle defrosting mode and executes the first refrigerant flow through the refrigerant outlet pipeline of the outdoor heat exchanger of the air conditioner. Heating operation. 2. The control method according to claim 1, wherein the defrosting entry conditions include: t _im ≥ t _threshold , T _e ≤ T frost _condensation , T _emax -T _e ≥ △T1, and T _{out of liquid} - T _e ≤ △T2; Wherein, the t _im is the cumulative running time of the compressor, the t _{threshold is a} preset time threshold, the T _e is the temperature of the outdoor coil, and T _frost is the critical frost temperature of the current working condition, T _emax is the maximum value of the outdoor coil temperature recorded after the air conditioner is turned on this time, and the T _outlet is the refrigerant outlet of the refrigerant flowing through the refrigerant outlet pipeline of the outdoor heat exchanger in the heating mode. Liquid temperature, ΔT1 is the preset first temperature difference threshold, and ΔT2 is the preset second temperature difference threshold. 3. The control method according to claim 2, characterized in that, the heating parameters of the first heating operation are determined according to the time difference or the temperature difference; Wherein, the time difference includes: a time difference between the accumulated running time of the compressor and the time threshold; The temperature difference includes: a first temperature difference between the maximum outdoor coil temperature and the outdoor coil temperature, a second temperature between the frost critical temperature and the outdoor coil temperature difference, or, the third temperature difference between the outlet temperature of the refrigerant and the temperature of the outdoor coil; The heating parameters include a heating rate and/or a heating duration of the first heating operation. 4. The control method according to claim 3, wherein determining the heating rate of the refrigerant flowing through the refrigerant inlet pipeline according to the time difference comprises: According to the time difference, the corresponding first heating rate is obtained from the first rate correlation, so as to perform heating according to the first heating rate. 5. The control method according to claim 3, wherein determining the heating rate of the refrigerant flowing through the refrigerant inlet pipeline according to the temperature difference comprises: Obtain a corresponding second heating rate from a second rate correlation according to the first temperature difference, so as to perform heating according to the second heating rate; or, Obtain a corresponding third heating rate from a third rate correlation according to the second temperature difference, so as to perform heating according to the third heating rate; or, According to the third temperature difference, a corresponding fourth heating rate is obtained from a fourth rate correlation, so as to perform heating according to the fourth heating rate. 6. The control method according to claim 3, wherein determining the heating duration of the refrigerant flowing through the refrigerant inlet pipeline according to the time difference includes: According to the time difference, the corresponding first heating duration is obtained from the first duration correlation, so as to perform heating according to the first heating duration. 7. The control method according to claim 3, characterized in that the heating duration of the refrigerant flowing through the refrigerant inlet pipeline is determined according to the temperature difference, comprising: According to the first temperature difference, obtain the corresponding second heating duration from the second duration correlation, so as to perform heating according to the second heating duration; or, According to the second temperature difference, a corresponding third heating duration is obtained from a third duration correlation, so as to perform heating according to the third heating duration; or, According to the third temperature difference, the corresponding fourth heating duration is obtained from the fourth duration correlation, so as to perform heating according to the fourth heating duration. 8. The control method according to any one of claims 1 to 7, further comprising: After the air conditioner is turned on in the heating mode, the control performs a second heating operation on the refrigerant flowing through the refrigerant outlet pipeline of the outdoor heat exchanger of the air conditioner. 9. The control method according to claim 8, characterized in that, after controlling to execute the second heating operation, further comprising: Obtain the return air temperature of the compressor of the air conditioner; When the return air temperature of the compressor satisfies a preset temperature rise condition, controlling to stop the second heating operation; Wherein, the temperature rise condition includes: the return air temperature is greater than or equal to a preset return air temperature threshold. 10. A control device for defrosting an air conditioner, comprising a processor and a memory storing program instructions, characterized in that, the processor is configured to, when executing the program instructions, execute the The control method for air conditioner defrosting described in any one. 11. An air conditioner, characterized in that it comprises: Refrigerant circulation circuit is composed of outdoor heat exchanger, indoor heat exchanger, throttling device and compressor connected by refrigerant pipeline; The heating device is arranged on the refrigerant outlet pipeline of the outdoor heat exchanger in the heating mode, and is configured to heat the refrigerant flowing through the refrigerant outlet pipeline; The control device for air conditioner defrosting according to claim 10 is electrically connected with the heating device.