CN110469979B - Control method and device for defrosting of air conditioner and air conditioner - Google Patents

Abstract

The application relates to the technical field of air conditioner defrosting, and discloses a control method for air conditioner defrosting. The control method comprises the following steps: in the process of the air conditioner running heating mode, acquiring the temperature of an indoor coil, the temperature of an outdoor coil and the temperature of an upper shell of an outdoor heat exchanger; and after the condition of meeting the defrosting entry condition is determined according to the temperature of the indoor coil, the temperature of the outdoor coil and the temperature of the upper shell, controlling to enter a reverse circulation defrosting mode and executing a first heating operation on a refrigerant flowing through a refrigerant liquid outlet pipeline of the outdoor heat exchanger. The control method judges whether the air conditioner meets defrosting entry conditions according to the temperature of the indoor coil, the temperature of the outdoor coil and the temperature of the upper shell of the outdoor heat exchanger, and improves the control precision of controlling the defrosting of the air conditioner; and the adverse effect of frost condensation on the heating performance of the air conditioner is accelerated and reduced by a reverse circulation defrosting mode and a mode of heating the refrigerant flowing through the refrigerant liquid outlet pipeline. The application also discloses a controlling means and air conditioner for the air conditioner defrosting.

Description

Control method, device and air conditioner for air conditioner defrosting

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, most of the mainstream models of air conditioners have the heat exchange function of cooling and cooling dual-mode. Here, users generally adjust the air conditioner to the heating mode in low temperature areas or under climatic conditions with heavy wind and snow, so as to use the air conditioner to improve The temperature of the indoor environment; during the heating process of the air conditioner, the outdoor heat exchanger of the outdoor unit plays the role of an evaporator that absorbs heat from the outdoor environment, and is affected by the temperature and humidity of the outdoor environment. It is easy to condense more frost on the appliance, and when the combined frost reaches a certain thickness, the heating capacity of the air conditioner will become lower and lower, so in order to ensure the heating effect and avoid excessive frost condensation, it is necessary to outdoor The heat exchanger is defrosted.

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 refrigerant. The heat melts the frost; the second is to add an electric heating device to the refrigerant pipeline of the air conditioner, and the electric heating device is used 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 can change the temperature and pressure state of the refrigerant in the refrigerant pipeline, so that it can also play the role of defrosting 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 the related art:

Since the defrosting process of the defrosting method of the outdoor heat exchanger shown in the above embodiment will more or less affect the normal heating performance of the air conditioner, the air conditioner will perform defrosting judgment before defrosting, and then Whether the air conditioner is defrosted is controlled according to the judgment result; in the related art, defrosting is generally judged 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 Due to the influence of various factors such as its own operating status, the above defrosting judgment method is too rough, and it is difficult to meet the needs of the air conditioner to accurately trigger the defrosting action.

SUMMARY OF THE INVENTION

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

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

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

During the operation of the air conditioner in the heating mode, obtain the temperature of the indoor coil, the temperature of the outdoor coil, and the temperature of the upper shell of the outdoor heat exchanger;

After it is determined that the defrost entry condition is satisfied according to the indoor coil temperature, the outdoor coil temperature and the upper casing temperature, the control enters a reverse cycle defrost mode and executes the control of the outdoor heat exchanger flowing through the air conditioner. The first heating operation of the refrigerant in the refrigerant outlet pipeline.

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:

The refrigerant circulation loop is composed of an outdoor heat exchanger, an indoor heat exchanger, a throttling device and a compressor connected by a refrigerant pipeline;

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

As described in some of the above embodiments, the control device for defrosting an air conditioner is electrically connected to the heating device.

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

The control method for air conditioner defrosting provided by the embodiment of the present disclosure can comprehensively determine whether the air conditioner meets the defrost entry requirement according to the obtained indoor coil temperature, outdoor coil temperature, and the temperature of the upper shell of the outdoor heat exchanger. Condition judgment can effectively improve the control accuracy of controlling air conditioner defrosting; and use high-temperature refrigerant to defrost the outdoor heat exchanger through the reverse cycle defrosting mode, and further heat the refrigerant flowing through the refrigerant outlet pipeline. Increasing the temperature of the refrigerant flowing into the outdoor heat exchanger in the reverse cycle mode 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.

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 accompanying drawings, which are not intended to limit the embodiments, and elements with the same reference numerals in the drawings are shown as similar elements, The drawings do not constitute a limitation of scale, and in which:

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

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

3 is a schematic structural diagram of a control device for air conditioner defrosting 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 features and technical contents 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, which are for reference only and are not intended to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, numerous details are provided 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 FIG. 1 , an embodiment of the present disclosure provides a control method for defrosting an air conditioner, which can be used to solve the problem that frost occurs in the outdoor heat exchanger when the air conditioner operates under rain and snow or low temperature and severe cold conditions, which affects the normal operation of the air conditioner. The problem of thermal performance; in an embodiment, the main flow steps of the control method include:

S101. During the heating mode of the air conditioner, obtain the temperature of the indoor coil, the temperature of the outdoor coil, and the temperature of the upper shell of the outdoor heat exchanger;

In the embodiment, when the outdoor heat exchanger of the outdoor unit of the air conditioner has a frosting problem, the outdoor environment is mostly in a harsh working condition with low temperature and high humidity. At this time, the user generally sets the air conditioner to operate in the heating mode , in order 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 flow that is enabled when the air conditioner operates in the heating mode.

When the air conditioner operates in other modes such as cooling mode and dehumidification mode, since the outdoor conditions corresponding to these modes generally do not cause the problem of frost on the outdoor unit of the air conditioner, it is optional to operate the air conditioner in other non-heating modes. , 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 the cooling mode, dehumidification mode, etc., which affects the normal cooling or dehumidification workflow of the air conditioner.

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

In the embodiment of the present disclosure, the temperature change of the coil position of the indoor heat exchanger is directly affected by the temperature of the refrigerant flowing into the indoor heat exchanger, so the change of the heating capacity of the air conditioner to the indoor environment can be reflected from the side, Since the heating capacity of the air conditioner will change under different frost conditions, the indoor coil temperature is the reference factor for the influence of the frost condition of the outdoor unit of the air conditioner on the attenuation of the heating capacity of the air conditioner.

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

In an optional embodiment, the outdoor unit of the air conditioner is further provided with a third temperature sensor, and the third temperature sensor can be used to detect the real-time temperature flowing through the upper casing of the outdoor heat exchanger or the refrigerant pipeline in the upper part; Therefore, the temperature of the upper casing obtained in step S101 may be the real-time temperature detected by the third temperature sensor;

In this embodiment, the refrigerant inlet pipeline of the outdoor heat exchanger is arranged at the lower part, and the refrigerant outlet is arranged at the upper part. Therefore, in the heating mode, the refrigerant flows into the outdoor heat exchanger from below and flows out of the outdoor heat exchanger from above. ; Therefore, the temperature of the upper shell is affected by the temperature of the refrigerant that has flowed through most of the pipes of the outdoor heat exchanger and has been heat-exchanged with the outdoor environment, which can reflect the heat exchange efficiency of the refrigerant under different frost conditions; When the air conditioner is not frosted, the refrigerant absorbs more heat from the outdoor environment, so the temperature of the upper casing affected by it is also higher; and when the air conditioner is frosted, the refrigerant absorbs heat from the outdoor environment. less, so the upper case temperature is also lower. In this way, the temperature of the upper shell of the outdoor heat exchanger can more accurately reflect the frosting degree of the outdoor heat exchanger than the temperature of the outdoor coil at the lower part of the outdoor heat exchanger.

S102. After it is determined that the defrosting entry condition is satisfied according to the indoor coil temperature, the outdoor coil temperature and the temperature of the upper casing, control to enter the reverse cycle defrosting mode and execute the control of the refrigerant outlet pipeline flowing through the outdoor heat exchanger of the air conditioner. The first heating operation of the refrigerant.

Here, the air conditioner is preset with a defrost entry condition. When the air conditioner operates in the heating mode, it can be judged whether the air conditioner meets the defrost entry condition according to the obtained parameters; if so, the air conditioner needs to remove 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 three parameters of the indoor coil temperature, outdoor coil temperature and upper casing temperature of the indoor unit obtained in step S101; among them, The temperature of the indoor coil can reflect the degree of attenuation of its heating performance under the influence of frost on the air conditioner. The temperature of the outdoor coil and the temperature of the upper shell can more sensitively reflect the temperature change of the refrigerant pipeline at different positions of the outdoor heat exchanger. In this way, the embodiments of the present disclosure combine the above three factors and parameters to jointly judge whether the air conditioner has a frosting problem, which can greatly improve the judgment accuracy of the air conditioner defrosting, so that the defrosting operation triggered by the air conditioner can be more in line with the real-time air conditioner. Frost condition.

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

T _p -T1≤△T1, T2-T _e ≥△T2, T _{upper shell max} -T _{upper shell} ≥△T3,

And T _outlet -T _upper shell≤△T4;

Among them, T _p is the indoor coil temperature, T _e is the outdoor coil temperature, T1 is the initial indoor coil temperature when the air conditioner is turned on, T2 is the initial outdoor coil temperature when the air conditioner is turned on, and T _{upper shell max} is the air conditioner The maximum temperature of the upper shell of the outdoor heat exchanger recorded after the first start-up operation, T _{upper shell} is the temperature of the upper shell of the outdoor heat exchanger, and T _outlet is the refrigerant flowing through the outdoor heat exchanger in the heating mode The refrigerant outlet temperature of the refrigerant in the outlet pipeline, ΔT1 is the preset first temperature difference threshold, ΔT2 is the preset second temperature difference threshold, ΔT3 is the preset third temperature difference threshold, and ΔT4 is the preset The fourth temperature difference threshold.

In the defrosting entry condition, the temperature difference between the indoor coil temperature and the initial indoor coil temperature can reflect the heating capacity of the air conditioner after it is turned on. For example, when the air conditioner is frosted, the heating capacity of the air conditioner decreases, and the indoor coil temperature rises only slightly after the air conditioner is turned on. Therefore, the difference between the detected indoor coil temperature and the initial indoor coil temperature is small. When the air conditioner is not frosted, the heating capacity of the air conditioner is normal, and the indoor coil temperature rises greatly after the air conditioner is turned on, so the difference between the detected indoor coil temperature and the initial indoor coil temperature is large. .

The temperature difference between the outdoor coil temperature and the initial outdoor coil temperature can reflect the change of the temperature of the outdoor coil itself under the influence of the internal and external environment of the air conditioner; generally, the operating conditions of the outdoor environment are good and the air conditioner heating is normal. Therefore, the change of the outdoor coil temperature is limited compared to the initial outdoor coil temperature; and when the outdoor environment becomes a bad working condition that is easy to cause frost on the outdoor heat exchanger, it will be affected by the change of the outdoor ambient temperature. The temperature of the outdoor coil decreases rapidly, so that the change of the initial outdoor coil temperature will also fluctuate greatly; in this way, one of the defrosting entry conditions of the present application is based on outdoor conditions under different outdoor conditions. The coil temperature is used for defrosting judgment.

In addition, the maximum temperature of the upper shell of the outdoor heat exchanger and the temperature of the upper shell of the outdoor heat exchanger recorded after the air conditioner is turned on this time can also reflect the heat absorption of the refrigerant in the outdoor heat exchanger under different frost conditions. Efficiency, and thus can also be used as a parameter for judging the degree of frosting of the air conditioner.

Meanwhile, when the defrosting entry condition is set, step S101 also includes acquiring the refrigerant outlet temperature.

In an optional embodiment, the outdoor unit of the air conditioner is further provided with a fourth temperature sensor, and the fourth temperature sensor 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 obtained in step S101 may be the real-time temperature of the refrigerant detected by the fourth temperature sensor;

Here, the refrigerant outlet pipeline is the pipeline through which the refrigerant flows out of the outdoor heat exchanger when the air conditioner operates in the 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 is affected by the frosting degree of the outdoor heat exchanger; Here, when the degree of frosting of the air conditioner is low and the thickness of the frost is thin, the effect of the frost on the heat exchange is small, and the refrigerant flowing through the outdoor heat exchanger absorbs more heat; In the case of high temperature and thick frost thickness, the effect of frost on heat exchange is greater, and the refrigerant that flows through the outdoor heat exchanger absorbs less heat. Therefore, the obtained refrigerant outlet temperature can be used as a reference factor to measure the frosting degree of the air-conditioning heat exchanger.

In addition, when the air conditioner has a frosting problem, 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 outdoor heat exchanger, especially the upper part. The temperature of the shell; therefore, when the temperature difference between the refrigerant outlet temperature and the temperature of the upper shell is small, it means that the outdoor heat exchanger of the air conditioner may have a frosting problem at this time.

Therefore, the defrosting entry condition in the embodiment of the present disclosure comprehensively considers the influence of parameters on the frost formation of the outdoor heat exchanger under different working conditions, which can effectively improve the judgment accuracy of air conditioner defrosting and reduce problems such as misjudgment and false triggering. appearance.

In the embodiment of the present disclosure, after it is determined that the defrosting entry condition is satisfied according to the temperature of the indoor coil, the temperature of the outdoor coil, and the temperature of the upper shell of the outdoor heat exchanger, the defrosting operation of the air conditioner includes controlling to enter the reverse cycle defrosting mode and A first heating operation of the refrigerant flowing through the refrigerant outlet line of the outdoor heat exchanger of the air conditioner is performed.

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

At the same time, in the reverse cycle mode, the refrigerant outlet pipeline in the heating mode essentially becomes the "refrigerant inlet pipeline", that is, the refrigerant flows into the outdoor heat exchanger through the refrigerant outlet pipeline 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 it is determined that the defrosting entry condition is satisfied according to the temperature of the indoor coil, the temperature of the outdoor coil and the temperature of the upper shell of the outdoor heat exchanger, the reverse cycle defrosting mode can be controlled to operate and the heating device can be turned on to execute the first a heating operation; and if it is determined that the defrosting entry condition is not satisfied according to the temperature of the indoor coil, the temperature of the outdoor coil and the temperature of the upper shell of the outdoor heat exchanger, the heating mode is kept unchanged and the heating device is maintained. Disabled.

In one embodiment, the heating device is an electromagnetic heating device, and the electromagnetic heating device uses the principle of electromagnetic induction heating to heat the refrigerant pipeline, and then uses the refrigerant pipeline to conduct heat to the refrigerant flowing through the refrigerant pipeline, so as to achieve the effect of heating the refrigerant. Purpose.

Here, the refrigerant pipeline section heated by the electromagnetic heating device is a pipe section made of metal 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 around 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 through the refrigerant pipe section, which will generate eddy currents inside the refrigerant pipe section, so that these eddy currents can be relied on The energy plays the role of heating and heating.

It should be understood that the type of the heating device used for heating 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 solutions of the present application. and covered within the scope of protection of this application.

In an optional embodiment, when controlling the first heating operation of the refrigerant outlet pipeline in step S102, the heating operation of the first heating operation may be determined according to the temperature difference, and then the first heating operation may be performed according to the heating operation operate.

Among them, the temperature difference includes: the first temperature difference between the initial outdoor coil temperature and the outdoor coil temperature, the second temperature difference between the maximum temperature of the upper casing and the temperature of the upper casing, or the refrigerant The third temperature difference between the temperature of the liquid outlet and the temperature of the upper casing; the heating parameter includes the heating rate or the heating time of the first heating operation.

In the above technical content, the first temperature difference value, the second temperature difference value and the third temperature difference value are also one of the sub-conditions of the defrost entry condition; therefore, when it is determined in step S102 that the defrost entry condition is satisfied , the effect of frost on the outdoor heat exchanger on the heating performance of the air conditioner can be estimated according to the first temperature difference, the second temperature difference and the third temperature difference. The heating rate and heating time of the refrigerant in the road are adjusted to meet the heating performance needs of the air conditioner.

For example, when the degree of frosting of the outdoor heat exchanger is high, the heating performance of the air conditioner will be attenuated greatly, so the heating rate of the refrigerant is set to be faster, so as to improve the heating rate of the outflowing refrigerant, so that it can be heated as quickly as possible. Meet the return air temperature requirements; and set the heating time of 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 seriously 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 value includes: obtaining the corresponding first heating rate from the first rate correlation relationship according to the first temperature difference value, so as to obtain the corresponding first heating rate according to the first temperature difference value. heating rate.

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

Here, the first rate association relationship includes one or more corresponding relationships between the first temperature difference and the first heating rate. Here, Table 1 shows an optional correspondence between the first temperature difference and the first heating rate, as shown in the following table,

The first temperature difference (unit: °C) The first heating rate (unit: °C/min) a1＜T2-T_e≤a2 v11 a2＜T2-T_e≤a3 v12 a3<T2-T_e v13

Table 1

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

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

Yet 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 second temperature difference, to obtain the corresponding second heating rate according to the second temperature difference. Heating is performed at the second heating rate.

Here, the second rate association relationship includes one or more corresponding relationships between the second temperature difference and the second heating rate. Here, Table 2 shows an optional correspondence between the second temperature difference and the second heating rate, as shown in the following table,

The second temperature difference (unit: °C) Second heating rate (unit: °C/min) b1<T_{upper shell max}-T_{upper shell}≤b2 v21 b2<T_{upper shell max}-T_{upper shell}≤b3 v22 b3<T_{upper shell max}-T_{upper shell} v23

Table 2

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

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

Yet another option, determining the heating rate of the refrigerant flowing through the refrigerant outlet pipeline according to the temperature difference value includes: obtaining a corresponding third heating rate from the third rate correlation relationship according to the third temperature difference value to obtain a corresponding third heating rate according to the The third heating rate conducts heating.

Here, the third rate association relationship includes one or more corresponding relationships between the third temperature difference and the third heating rate. Here, Table 3 shows an optional correspondence between the third temperature difference and the third heating rate, as shown in the following table,

The third temperature difference (unit: °C) The third heating rate (unit: °C/min) c1<T_fluid-T_{upper shell}≤c2 v31 c2<T_fluid-T_{upper shell}≤c3 v32 c3<T_Fluid-T_{Upper shell} v33

table 3

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

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

In the above embodiment, since the degree of frosting of the outdoor heat exchanger has different influences on the heating performance of the air conditioner, it further affects the temperature changes of the first temperature difference, the second temperature difference and the third temperature difference The amplitudes are different, so in the present application, each of them is provided with a separate correlation relationship, and the air conditioner can select one of the correlation relationships according to actual needs to determine the corresponding heating rate.

Optionally, the rate correlation to be specifically selected may 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 and the second rate correlation are selected. It takes into account the effect of the outdoor coil temperature corresponding to the first temperature difference and the temperature of the upper shell corresponding to the second temperature difference on the defrosting effect; and when the current user's heating demand is high, select The second rate correlation relationship, at this time, mainly considers the effect of the temperature of the refrigerant outlet liquid, which can reflect the temperature of the refrigerant returning to the compressor, by the frosting of the outdoor heat exchanger, so that the refrigerant can also improve the refrigerant return after heating. temperature to ensure heating performance.

Here, the current heating demand of the user can be determined by the target heating temperature set by the air conditioner; for example, the air conditioner presets a heating temperature threshold, when the target heating temperature actually set by the user is lower than the heating temperature threshold , it means that the user's heating demand 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 means that the user's heating demand is high 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. , in order to fully ensure the control requirements of the air conditioner for user comfort during the defrosting process.

Similarly, in some optional embodiments, the corresponding first heating duration may also be obtained from the first duration correlation according to the first temperature difference, so as to perform heating according to the first heating duration.

Here, in the first duration correlation relationship, the first heating duration and the first temperature difference are positively correlated.

Alternatively, according to the second 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.

Here, in the second duration correlation, the second heating duration and the second temperature difference are positively correlated.

Or, according to the third 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.

Here, in the third duration correlation relationship, the third heating duration and the third temperature difference are negatively correlated.

In the above-mentioned embodiment, the method of obtaining the heating duration according to the temperature difference may refer to the aforementioned control process of obtaining the heating rate according to the temperature difference, which will not be 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, controlling the execution of outdoor heat exchange flowing through the air conditioner The second heating operation of the refrigerant in the refrigerant outlet line 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 of the air conditioner during the startup phase. performance.

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

In this embodiment, the air return end of the air-conditioning compressor is also provided with a temperature sensor, which can be used to detect the temperature of the refrigerant flowing through the air return end; therefore, the temperature of the refrigerant detected in real time can be obtained through the temperature sensor, and used as a Return air temperature for judging temperature rise conditions.

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 is indicated 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, so as to ensure the air conditioning system In the case of heat demand, the power consumption of the second heating operation can be reduced; and when the return air temperature is less 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 , an embodiment of the present disclosure provides another control method for air conditioner defrosting, and the control steps mainly include:

S201, the air conditioner is turned on and operates in a heating mode;

In this embodiment, the general user sets the heating mode as the current mode to start the air conditioner under low temperature and severe cold weather conditions.

S202, controlling the second heating operation of turning on the heating device;

In the embodiment of the present disclosure, the heating device is disposed 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, determine whether T _{return gas} ≥ T _{return gas threshold} , if yes, go to step S205, if not, return to go to step S203;

S205, stop performing the second heating operation;

S206, detecting the indoor coil temperature T _p of the indoor unit, the outdoor coil temperature T _e and the upper casing temperature T _{upper casing} of the outdoor heat exchanger;

S207, detecting the refrigerant inlet temperature T _inlet and the refrigerant outlet temperature T _outlet ;

S208. Determine whether T _p -T1≤△T1, T2-T _e ≥△T2, T _{upper shell max} -T _{upper shell} ≥△T3, and T _{liquid outlet} -T _{upper shell} ≤△T4, if so, Then execute step S209, if not, return to execute step S206;

In the embodiment of the present disclosure, T _p - T1 ≤ ΔT1, T2 - T _e ≥ ΔT2, T _{upper casing max} - T _{upper casing} ≥ ΔT3, and T _{liquid outlet} - T _{upper casing} ≤ ΔT4 are common Constitutes preset defrost entry conditions.

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 temperature of the upper casing as historical data; therefore, when the judgment step of step S208 is performed, the historical data can be retrieved. A plurality of upper shell temperatures, and determine the upper shell temperature maximum value T _{upper shell max} by comparison;

If the defrosting entry condition is satisfied, it means that the outdoor heat exchanger of the air conditioner has a frosting problem; and if the defrosting entry condition is not satisfied, it means that there is no frosting problem in the outdoor heat exchanger of the air conditioner at this time.

S209, according to T2-T _e , obtain the corresponding first heating rate from the first rate correlation;

S210, according to T2-T _e , obtain the corresponding first heating duration from the first duration correlation;

S211, 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 embodiment of the present disclosure can comprehensively judge whether the air conditioner satisfies the defrosting entry condition according to the obtained parameters such as the indoor coil temperature, outdoor coil temperature, and upper casing temperature, so as to effectively Improve the control accuracy of defrosting the air conditioner; and use the high-temperature refrigerant to defrost the outdoor heat exchanger through the reverse cycle defrost mode, and further improve the flow of the outdoor heat exchanger in the reverse cycle mode by heating the refrigerant flowing through the refrigerant outlet pipeline. The temperature of the refrigerant in the heat exchanger 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.

FIG. 3 is a schematic structural diagram of a control device for air conditioner defrosting 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 and includes:

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

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

As a computer-readable storage medium, the memory 301 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 the function application and data processing by running the program instructions/modules stored in the memory 301 , that is, to implement the control method for air conditioner defrosting in the above method embodiments.

The memory 301 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal device, and the like. In addition, the memory 301 may include high-speed random access memory, and may also include 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 FIG. 4 , the implementation of the present disclosure also provides an air conditioner, including:

The refrigerant circulation loop is composed of an outdoor heat exchanger 41, an indoor heat exchanger 42, a throttling device 43 and a compressor 44 connected by a refrigerant pipeline;

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 to the heating device 45 . Here, the control device for defrosting the air conditioner is the control device shown in the foregoing embodiments.

The air conditioner in the embodiment of the present disclosure can accurately detect and determine whether the air conditioner has a frosting problem, and when the air conditioner has a frosting problem, the above-mentioned control device and heating device are used 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 climate conditions, and improves the user experience.

Embodiments of the present disclosure further provide a computer-readable storage medium storing computer-executable instructions, where the computer-executable instructions are configured to execute the above-mentioned method for defrosting an air conditioner.

Embodiments of the present disclosure also provide 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, and when the program instructions are executed by a computer, the computer is made to execute the above-mentioned application for air conditioning. method of defrosting.

The above-mentioned computer-readable storage medium may be a transient computer-readable storage medium, and may also be a non-transitory computer-readable storage medium.

The technical solutions of the embodiments of the present disclosure may be embodied in the form of software products, and the computer software products are stored in a storage medium and include one or more instructions to enable a computer device (which may be a personal computer, a server, or a network equipment, etc.) to execute all or part of the steps of the methods described in the embodiments of the present disclosure. The aforementioned storage medium may be a non-transitory storage medium, including: U disk, removable 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 codes, and can also be a transient storage medium.

The foregoing description and drawings sufficiently illustrate the embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, process, and other changes. The examples represent only possible variations. Unless expressly required, individual components and functions are optional 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 the disclosed embodiments includes the full scope of the claims, along with all available equivalents of the claims. When used in this application, although the terms "first," "second," etc. may be used in this 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 termed a second element, and similarly, a second element could be termed a first element, so long as all occurrences of "the first element" were consistently renamed and all occurrences of "the first element" were named consistently The "second element" 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 this application are used to describe the embodiments only and not to limit the claims. As used in the description of the embodiments and the claims, the singular forms "a" (a), "an" (an) and "the" (the) are intended to include the plural forms as well, unless the context clearly dictates 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 listings. Additionally, when used in this application, the term "comprise" and its variations "comprises" and/or including and/or the like 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 limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in the process, method, or device that includes the element. Herein, each embodiment may focus on the differences from other embodiments, and the same and similar parts between the various embodiments may refer to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method section disclosed in the embodiments, reference may be made to the description of the method section for relevant parts.

Those skilled in the art can realize that the units and algorithm steps of each example 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 in hardware or software may depend on the specific application and design constraints of the technical solution. Skilled artisans may use different methods for implementing the described functionality for each particular application, but such implementations should not be considered beyond the scope of the disclosed embodiments. The skilled person can clearly understand that, for the convenience and brevity of description, the specific working process of the above-described systems, devices and units can refer to the corresponding processes in the foregoing method embodiments, and details are not repeated here.

In the embodiments disclosed herein, the disclosed methods and products (including but not limited to apparatuses, devices, etc.) may be implemented in other ways. For example, the apparatus 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 Either it can be integrated into another system, or some features can be omitted, or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms. The units described as separate components may or may not be physically separated, and components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. This embodiment may be implemented by selecting some or all of the units according to actual needs. In addition, each functional unit in the embodiment of the present disclosure may be integrated into one processing unit, or each unit may exist physically alone, 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 present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code that contains one or more functions for implementing the specified logical function(s) executable instructions. In some alternative implementations, the functions noted in the blocks may occur out of the order noted in the figures. For example, two blocks in succession may, in fact, be executed substantially concurrently, or the blocks 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, operations or steps corresponding to different blocks may also occur in different sequences than those disclosed in the description, and sometimes there is no specific relationship 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 of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented in special purpose hardware-based systems that perform the specified functions or actions, or special purpose hardware implemented in combination with computer instructions.

Claims (7)

1. a control method for air-conditioning defrosting, is characterized in that, comprises: After the air conditioner is turned on in the heating mode, control to perform a second heating operation for the refrigerant flowing through the refrigerant outlet pipeline of the outdoor heat exchanger of the air conditioner; During the operation of the air conditioner in the heating mode, obtain the temperature of the indoor coil, the temperature of the outdoor coil, and the temperature of the upper shell of the outdoor heat exchanger; After it is determined that the defrost entry condition is satisfied according to the indoor coil temperature, the outdoor coil temperature and the upper casing temperature, the control enters a reverse cycle defrost mode and executes the control of the outdoor heat exchanger flowing through the air conditioner. The first heating operation of the refrigerant in the refrigerant outlet pipeline; The defrost entry conditions include: T _p -T1≤△T1, T2-T _e ≥△T2, T _{upper shell max} -T _{upper shell} ≥△T3, And T _outlet -T _upper shell≤△T4; Wherein, the T _p is the temperature of the indoor coil, the T _e is the temperature of the outdoor coil, T1 is the initial indoor coil temperature when the air conditioner is turned on, and T2 is the initial outdoor temperature when the air conditioner is turned on Coil temperature, T _{upper shell max} is the maximum temperature of the upper shell of the outdoor heat exchanger recorded after the air conditioner is turned on this time, T _{upper shell} is the upper shell temperature of the outdoor heat exchanger, so The T _outlet is the outlet temperature of the refrigerant flowing through the refrigerant outlet pipeline of the outdoor heat exchanger in the heating mode, ΔT1 is the preset first temperature difference threshold, and ΔT2 is the preset second temperature difference threshold, ΔT3 is the preset third temperature difference threshold, and ΔT4 is the preset fourth temperature difference threshold; The first heating operation heating parameter is determined according to the temperature difference value and a preset correlation relationship; wherein the temperature difference value includes: the first temperature difference value between the initial outdoor coil temperature and the outdoor coil temperature, the second temperature difference between the maximum temperature of the upper casing and the temperature of the upper casing, or the third temperature difference between the temperature of the refrigerant outlet and the temperature of the upper casing; the The heating parameter includes the heating rate and/or the heating duration of the first heating operation; the preset correlation is from the first rate correlation, the second rate correlation and the third rate correlation according to the heating demand of the current user One of the selected ones; the first rate correlation is the corresponding relationship between the first temperature difference and the first heating rate, and the second rate correlation is the corresponding relationship between the second temperature difference and the second heating rate ; The third rate correlation is the corresponding relationship between the third temperature difference and the third heating rate. 2. The control method according to claim 1, wherein determining the heating rate of the first heating operation according to the temperature difference comprises: obtaining a corresponding first heating rate from a first rate correlation according to the first temperature difference, so as to perform a first heating operation according to the first heating rate; or, According to the second temperature difference value, a corresponding second heating rate is obtained from the second rate correlation, so as to perform the first heating operation according to the second heating rate; or, According to the third temperature difference value, a corresponding third heating rate is obtained from the third rate correlation, so as to perform the first heating operation according to the third heating rate. 3. The control method according to claim 1, wherein determining the heating duration of the first heating operation according to the temperature difference comprises: According to the first temperature difference value, obtain the corresponding first heating duration from the first duration correlation, so as to perform the first heating operation according to the first heating duration; or, Obtain a corresponding second heating duration from the second duration correlation according to the second temperature difference, so as to perform the first heating operation according to the second heating duration; or, According to the third temperature difference value, a corresponding third heating duration is obtained from the third duration correlation, so as to perform the first heating operation according to the third heating duration. 4. The control method according to claim 1, wherein the heating parameter of the first heating operation is positively correlated with the first temperature difference; The heating parameter of the first heating operation is positively correlated with the second temperature difference; The heating parameter of the first heating operation is negatively correlated with the third temperature difference. 5. The control method according to claim 1, characterized in that, after controlling the execution of the second heating operation, further comprising: obtaining the return air temperature of the compressor of the air conditioner; Controlling to stop the second heating operation when the return air temperature of the compressor satisfies a preset temperature rise condition; Wherein, the temperature rise condition includes: the return air temperature is greater than or equal to a preset return air temperature threshold. 6. A control device for defrosting an air conditioner, comprising a processor and a memory storing program instructions, wherein the processor is configured to execute the program instructions according to claims 1 to 5 when executing the program instructions Any one of the control methods for defrosting an air conditioner. 7. An air conditioner, characterized in that, comprising: The refrigerant circulation loop is composed of an outdoor heat exchanger, an indoor heat exchanger, a throttling device and a compressor connected by a refrigerant pipeline; a heating device, arranged on the refrigerant outlet pipeline in the heating mode of the outdoor heat exchanger, and configured to heat the refrigerant flowing through the refrigerant outlet pipeline; The control device for air conditioner defrosting according to claim 6, which is electrically connected to the heating device.

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