CN110736203B

CN110736203B - Control method and control device for defrosting of air conditioner and air conditioner

Info

Publication number: CN110736203B
Application number: CN201910911867.5A
Authority: CN
Inventors: 许文明; 罗荣邦
Original assignee: Qingdao Haier Air Conditioner Gen Corp Ltd; Haier Smart Home Co Ltd
Current assignee: Qingdao Haier Air Conditioner Gen Corp Ltd; Haier Smart Home Co Ltd
Priority date: 2019-09-25
Filing date: 2019-09-25
Publication date: 2021-11-23
Anticipated expiration: 2039-09-25
Also published as: CN110736203A

Abstract

The application relates to the technical field of air conditioner defrosting, and discloses a control method for air conditioner defrosting. The control method includes: acquiring defrosting working parameters and defrosting attenuation parameters during the bypass defrosting mode of air conditioner operation; determining whether defrosting protection conditions are met according to the defrosting working parameters and defrosting attenuation parameters; When the defrost attenuation parameter satisfies the defrost protection condition, the refrigerant flow of the refrigerant circulation circuit is increased. The control method provided by the embodiment of the present disclosure can control and increase the refrigerant flow rate of the refrigerant circulation circuit according to the operation of the air conditioner in the bypass defrost mode, and can reduce the high temperature refrigerant flow rate for defrosting that is shunted by the defrost bypass branch, thereby reducing the flow rate of the refrigerant. Reduce the adverse effects of double drop in temperature and flow rate of the compressor's gaseous return air refrigerant caused by excessive refrigerant being used for defrosting. The application also discloses a control device for defrosting an air conditioner and an air conditioner.

Description

Control method and control device for defrosting of air conditioner and air conditioner

Technical Field

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

Background

With the development of science and technology, an air conditioner, which is a necessary electrical appliance for ordinary people's daily life, has been gradually developed from an initial single-cooling type to an advanced type capable of having more functions such as cooling, heating and defrosting, and here, an important problem inevitably faced by air-conditioning products operating in low-temperature areas or in climates with heavy wind and snow is the problem of frosting of the outdoor unit of the air conditioner, the outdoor heat exchanger of the outdoor unit functions as an evaporator for absorbing heat from the outdoor environment, and is affected by the temperature and humidity of the outdoor environment in winter, and much frost is easily condensed on the outdoor heat exchanger, when the frost is formed to a certain thickness, the heating capacity of the air conditioner will be lower and lower, so the defrosting function is also an important research topic in the air conditioning field gradually in order to ensure the heating effect and avoid excessive frost condensation.

In the prior art, the defrosting mode of the outdoor heat exchanger mainly comprises the following modes: firstly, in a reverse cycle defrosting mode, when the air conditioner performs reverse cycle defrosting, a high-temperature refrigerant discharged by a compressor firstly flows through an outdoor heat exchanger so as to melt frost by using the heat of the refrigerant; and secondly, a bypass defrosting mode is adopted, when the air conditioner is in normal heating operation, the high-temperature refrigerant discharged by the compressor can be conveyed to the outdoor heat exchanger through the independently arranged bypass branch, and the purpose of melting frost by using the heat of the refrigerant can also be realized.

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:

for the bypass defrosting mode, as a large amount of refrigerants directly flow to the outdoor heat exchanger for defrosting, the refrigerants after heat release are changed from gaseous state to liquid state, and meanwhile, the refrigerant evaporation function of the outdoor heat exchanger is inhibited, so that more and more liquid refrigerants and less gaseous refrigerants are contained in the refrigerant circulation loop of the air conditioner, the temperature and flow of returned air and sucked air of the compressor are further reduced, and finally the defrosting capacity of the whole air conditioner is reduced along with time.

Disclosure of Invention

The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.

The embodiment of the disclosure provides a control method and a control device for defrosting of an air conditioner and the air conditioner, so as to solve the technical problem that defrosting capacity of a bypass defrosting mode is reduced along with time in the related art.

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

acquiring defrosting working parameters and defrosting attenuation parameters in the process of operating a bypass defrosting mode of the air conditioner; the bypass defrosting mode comprises the step of leading the refrigerant discharged by the compressor into the outdoor heat exchanger through a defrosting bypass branch;

determining whether the defrosting protection condition is met according to the defrosting working parameter and the defrosting attenuation parameter;

and under the condition that the defrosting working parameter and the defrosting attenuation parameter meet the defrosting protection condition, increasing the refrigerant flow of the refrigerant circulation loop.

In some embodiments, a control apparatus for defrosting an air conditioner includes: a processor and a memory storing program instructions, the processor being configured to, when executing the program instructions, perform a control method for air conditioner defrosting as in some of the foregoing embodiments.

In some embodiments, an air conditioner includes:

the refrigerant circulating loop is formed by connecting an outdoor heat exchanger, an indoor heat exchanger, a throttling device and a compressor through refrigerant pipelines;

one end of the defrosting bypass branch is communicated with an exhaust port of the compressor, and the other end of the defrosting bypass branch is communicated with a refrigerant outlet pipeline of the outdoor heat exchanger in the heating mode; the defrosting bypass branch is provided with a control valve;

the control device for defrosting the air conditioner in some embodiments is electrically connected with the throttling device.

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

the control method for defrosting of the air conditioner can control and increase the refrigerant flow of the refrigerant circulation loop according to the defrosting attenuation parameter and the defrosting working parameter in the process of running the bypass defrosting mode of the air conditioner, and the power of the compressor is unchanged, so the refrigerant flow increase of the refrigerant circulation loop can reduce the high-temperature refrigerant flow which is branched by the defrosting bypass branch and used for defrosting, thereby reducing the adverse effect of double reduction of the temperature and the flow of the gaseous return air refrigerant of the compressor caused by the fact that excessive refrigerants are used for defrosting, and further reducing the problem that the defrosting capacity of the air conditioner is reduced along with the time caused by running the bypass defrosting mode.

The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.

Drawings

One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:

fig. 1 is a schematic flowchart of a control method for defrosting an air conditioner according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of a control device for defrosting an air conditioner according to an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of an air conditioner provided in an embodiment of the present disclosure.

Detailed Description

So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. In the following description of the technology, 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 in simplified form in order to simplify the drawing.

Fig. 1 is a schematic flow chart of a control method for defrosting an air conditioner according to an embodiment of the present disclosure.

As shown in fig. 1, the embodiment of the present disclosure provides a control method for defrosting an air conditioner, which can be used to solve the problem that the defrosting capability of the air conditioner gradually decreases after the air conditioner operates in a bypass defrosting mode under rainy or snowy or low-temperature and severe cold conditions; in an embodiment, the main flow steps of the control method include:

s101, acquiring defrosting operating parameters and defrosting attenuation parameters in the process of operating a bypass defrosting mode of the air conditioner;

in an embodiment of the present disclosure, the bypass defrosting mode includes guiding the refrigerant discharged from the compressor into the outdoor heat exchanger through the defrosting bypass branch.

The refrigerant discharged from the compressor is a high-temperature refrigerant which is discharged from an exhaust port of the compressor and compressed by the compressor, and the refrigerant carries more heat, so that after the refrigerant is introduced into the outdoor heat exchanger, the heat of the refrigerant can be conducted to the shell of the outdoor heat exchanger, the temperature of the outdoor heat exchanger is increased, ice frost condensed on the outdoor heat exchanger is melted by absorbing heat, and the purpose of defrosting the outdoor heat exchanger is achieved.

In some air conditioning structures applied to the embodiment of the disclosure, one end of the defrosting bypass branch is connected in parallel to the exhaust port of the compressor, and the other end of the defrosting bypass branch is connected to the refrigerant inlet end of the outdoor heat exchanger in the heating mode. In this way, since the refrigerant pressure at the discharge port of the compressor is high, part of the refrigerant discharged from the compressor flows from the discharge port of the compressor to the refrigerant inlet end of the outdoor heat exchanger along the defrosting bypass branch, and the refrigerant flows into the outdoor heat exchanger together after being mixed with the refrigerant flowing in the refrigerant circulation circuit at the refrigerant inlet end.

In the embodiment of the disclosure, after the air conditioner enters the bypass defrosting mode, the air conditioner still keeps the flow direction of the refrigerant limited by the heating mode unchanged, that is, the heating mode and the bypass defrosting mode of the air conditioner are performed simultaneously; therefore, except for one part of the refrigerant discharged by the compressor for defrosting, other parts of the refrigerant can still continue to flow in the refrigerant circulating loop, and the heating and temperature rising effects on the indoor environment limited by the heating mode are ensured.

In some embodiments, the defrost decay parameter obtained in step S101 is the decay amount or decay rate of the indoor ambient temperature.

In the bypass defrosting mode in the air conditioning operation step S101, since a large amount of refrigerant directly flows to the outdoor heat exchanger for defrosting, the amount of refrigerant flowing through the refrigerant circulation circuit to the indoor heat exchanger and releasing heat to the indoor environment is reduced, and thus the execution of the bypass defrosting mode is often accompanied by a change in the indoor environment temperature. Along with the proceeding of the bypass defrosting mode, the liquid refrigerant in the refrigerant circulation loop of the air conditioner is increased, the gas refrigerant is reduced, the return air temperature and the return air flow of the compressor are reduced, and the fluctuation of the indoor environment temperature is more obviously influenced by the adverse effect of the bypass defrosting mode. Therefore, the amount or rate of attenuation of the indoor ambient temperature reflects to some extent the influence of the change in the indoor environment as the bypass defrosting mode proceeds. Therefore, in the embodiment of the present disclosure, the decay amount or the decay rate of the indoor ambient temperature is used as the reference parameter for the control adjustment in the subsequent step.

In some optional embodiments of the present disclosure, the indoor unit of the air conditioner is provided with a temperature sensor, and the temperature sensor can be used for detecting the temperature of the indoor environment in which the indoor unit is located; therefore, in the embodiment of the present disclosure, the attenuation amount or the attenuation rate of the indoor ambient temperature is determined according to the temperature data detected by the temperature sensor.

In other embodiments, the defrost decay parameter obtained in step S101 is a decay amount or a decay rate of the coil temperature of the indoor heat exchanger.

Here, the decrease in the temperature and the flow rate of the refrigerant caused by the bypass defrosting mode can directly affect the temperature change at the coil position of the indoor heat exchanger. Therefore, the attenuation amount or the attenuation rate of the coil temperature can also be selected as the reference parameter for controlling and adjusting in the subsequent steps.

In some optional embodiments of the present disclosure, the indoor heat exchanger is provided with a temperature sensor at a coil position thereof, and the temperature sensor can be used for detecting real-time temperature flowing through the coil; therefore, in the embodiment of the present disclosure, the temperature data of the coil detected by the temperature sensor is used to determine the attenuation amount or the attenuation rate of the coil temperature.

It should be understood that the defrost decay parameters of the present application include, but are not limited to, the indoor ambient temperature or the coil temperature of the indoor heat exchanger shown in the above embodiments; other air conditioner parameters with attenuation change under the influence of the bypass defrosting mode in the process of operating the air conditioner in the defrosting bypass mode also should be covered in the protection scope of the technical scheme of the application.

In some embodiments, the defrosting operation parameter obtained in step S101 is the current defrosting time period of the bypass defrosting mode.

The air conditioner is provided with a timing module, and the timing module can be used for timing in the process of running the bypass defrosting mode of the air conditioner; therefore, the current defrosting time period obtained in step S101 is the time period data recorded by the timer module.

Here, when the air conditioner exits the bypass defrosting mode, the current timing duration of the timing module is cleared, so that the timing is restarted when the air conditioner enters the bypass defrosting mode next time, and the control accuracy is improved.

S102, determining whether a defrosting protection condition is met according to the defrosting working parameter and the defrosting attenuation parameter;

optionally, when the defrosting attenuation parameter acquired in step S101 is an attenuation amount or an attenuation rate of the indoor ambient temperature, the defrosting protection condition may be set to any one of the following conditions: (1) delta T_{Indoor use}Δ T1, and T_Defrosting≥t_{Threshold value}；(2)V_{Indoor use}Not less than V1, and t_Defrosting≥t_{Threshold value}；(3)△T_{Indoor use}≥△T1，V_{Indoor use}T is not less than V1_Defrosting≥t_{Threshold value}. Wherein, Delta T_{Indoor use}Is a first attenuation amount of the indoor ambient temperature, Δ T1 is a first temperature attenuation threshold, V_{Indoor use}A first decay rate of the indoor ambient temperature, V1 a first rate decay threshold, t_DefrostingFor the current defrost duration of the bypass defrost mode, t_{Threshold value}Is a duration threshold.

In the above embodiment, the attenuation amount or attenuation rate of the indoor environment temperature is mainly used, and the data comparison between the corresponding temperature thresholds is combined with the numerical comparison between the current defrosting time length and the time length threshold thereof to jointly serve as the defrosting protection condition; here, the temperature attenuation threshold and the rate attenuation threshold are generally used as threshold values for measuring the influence of the bypass defrosting mode of the air conditioner on the indoor environment temperature, and when the first attenuation amount of the indoor environment temperature is higher than the first temperature attenuation threshold, or the first attenuation rate of the indoor environment temperature is higher than the first rate attenuation threshold, the bypass defrosting mode has a large influence on the performance of the compressor, so that the influence of the bypass defrosting mode of the air conditioner on the temperature of the indoor environment is reflected to be large, and the current and subsequent defrosting capacities of the compressor are greatly weakened; otherwise, the current and subsequent defrosting capacity of the air conditioner can still be kept in a better state. Through, this reference factor of duration is still introduced to the defrosting protection condition of this application, reduces the error influence that indoor ambient temperature or coil pipe temperature that the defrosting initial stage leads to appear great fluctuation because of the branch road reposition of redundant personnel.

Optionally, when the defrosting attenuation parameter acquired in step S101 is an attenuation amount or an attenuation rate of the indoor ambient temperature, the defrosting protection condition may be set to any one of the following conditions: (1) delta T_{Coil pipe}Δ T2, and T_Defrosting≥t_{Threshold value}；(2)V_{Coil pipe}Not less than V2, and t_Defrosting≥t_{Threshold value}；(3)△T_{Coil pipe}≥△T2，V_{Coil pipe}T is not less than V2_Defrosting≥t_{Threshold value}. Wherein, Delta T_{Coil pipe}Is a second attenuation amount of the coil temperature of the indoor heat exchanger, Δ T2 is a second temperature attenuation threshold value, V_{Coil pipe}Is a second decay rate of the coil temperature of the indoor heat exchanger, and V2 is a second rate decay threshold.

In the above optional embodiment, the attenuation amount or attenuation rate of the coil temperature of the indoor heat exchanger is mainly used, and is compared with the data between the corresponding temperature thresholds, and the comparison of the current defrosting time length and the time length threshold is combined to be used as the defrosting protection condition.

Here, when the defrost attenuation parameter acquired in step S101 is another air conditioning parameter, the defrost protection condition may also be set with reference to the above-described embodiment, and the present invention is not limited thereto.

And S103, under the condition that the defrosting working parameter and the defrosting attenuation parameter meet the defrosting protection condition, increasing the refrigerant flow of the refrigerant circulation loop.

Optionally, in step S103, under the condition that it is determined that the defrosting operation parameter and the defrosting attenuation parameter do not satisfy the defrosting protection condition in step S102, the current operating state of the air conditioner is kept unchanged; alternatively, the process returns to step S101.

In the embodiment of the present disclosure, when it is determined in step S103 that the defrosting operation parameter and the defrosting attenuation parameter satisfy the defrosting protection condition, the refrigerant flow rate of the refrigerant circulation circuit is increased. Here, the refrigerant flow rate of the refrigerant circulation circuit is increased, so that the flow rate of the high-temperature refrigerant for defrosting branched by the defrosting bypass branch can be reduced, the adverse effect of dual drop of the temperature and the flow rate of the gaseous return air refrigerant of the compressor caused by excessive refrigerant used for defrosting is reduced, and the problem of the reduction of the defrosting capacity of the air conditioner caused by the operation of the bypass defrosting mode along with the time is reduced.

Optionally, a throttling device is disposed on the refrigerant circulation loop in the embodiment of the disclosure, and the throttling device may be used to control the adjustment of the refrigerant flow flowing through the refrigerant circulation loop. Therefore, in step S103, when it is determined that the defrosting operation parameter and the defrosting decay parameter satisfy the defrosting protection condition, the flow opening of the throttling device may be controlled to be increased, so as to increase the flow rate of the refrigerant flowing through the refrigerant circulation circuit.

Alternatively, the throttling device is an electronic expansion valve, or other valves with the same opening degree adjusting function.

In another alternative embodiment, for a refrigerant circulation loop using a capillary tube as a throttling device, since the capillary tube itself does not have a flow rate adjusting function, an electronic expansion valve may be added to the refrigerant circulation loop to adjust a flow rate opening degree of the refrigerant circulation loop through the electronic expansion valve.

In some alternative embodiments, the refrigerant flow rate of the refrigerant circulation circuit in step S103 may be increased by increasing the flow opening of the electronic expansion valve by a preset fixed flow opening. Here, the preset fixed flow rate opening degree is, for example, 30B, 50B, etc.

The mode of increasing the refrigerant flow by the preset fixed flow opening degree is simple to operate and convenient to use; however, it still has the disadvantage that the control method is too rough.

In still other alternative embodiments, the present application provides a technical solution in which the control manner is more accurate. In this embodiment, before increasing the refrigerant flow rate of the refrigerant circulation circuit, the method further includes: acquiring an adjusting range value of the refrigerant flow; and determining a target adjusting value from the adjusting range value of the refrigerant flow.

When the refrigerant flow of the refrigerant circulation loop is adjusted within the adjusting range value, the indoor environment temperature corresponding to the air conditioner is within a set temperature range; therefore, after the refrigerant flow of the refrigerant circulation loop is increased and adjusted, the indoor environment temperature is still in the set temperature range, so that the large disturbance influence of the flow adjustment operation on the indoor environment temperature is avoided, and the comfort level of indoor users is ensured.

Optionally, the set temperature range is a temperature range determined by taking a target heating temperature set by a current user as a central value; for example, if the target heating temperature set by a certain user is 26 ℃, the set temperature range may be set to 24 ℃ to 28 ℃. Therefore, the value variation within the set temperature range may be excessively large from the target heating temperature.

Here, the target adjustment value is used to indicate an adjustment range for increasing the refrigerant flow rate of the refrigerant circulation circuit. The adjustment operation of the refrigerant flow of the refrigerant circulation loop is executed according to the target adjustment value determined from the adjustment range, so that the effect of recovering or improving the defrosting capacity of the air conditioner can be achieved, and the comfort level of a user can be guaranteed to a certain extent.

In some optional embodiments, determining the target adjustment value from the adjustment range value of the refrigerant flow rate includes: and acquiring a corresponding target adjusting value from the adjusting range value according to the defrosting attenuation parameter and the first incidence relation.

Wherein the first correlation comprises a correspondence of one or more defrost decay parameters to an adjustment value of the adjustment range values.

Here, the defrost attenuation parameter can reflect the influence change of the defrosting bypass mode of the air conditioner operation on the temperature condition of the air conditioning environment or the indoor heat exchanger, and the increasing operation of the refrigerant flow rate of the refrigerant circulation circuit in step S103 is to improve the temperature condition of the indoor environment and the indoor heat exchanger. Therefore, the step of determining the target adjustment value of the refrigerant flow rate in the embodiment of the disclosure is a closed-loop feedback control manner, and has higher control accuracy and fast response speed.

Optionally, the defrost attenuation parameter for obtaining the corresponding target adjustment value from the adjustment range value includes the attenuation amount or attenuation rate of the indoor ambient temperature shown in the previous embodiment, or the attenuation amount or attenuation rate of the coil temperature of the indoor heat exchanger.

Optionally, when the defrosting attenuation parameter is the first attenuation amount or the first attenuation rate of the indoor ambient temperature, the corresponding first target adjustment value may be obtained from the first defrosting attenuation correlation according to the first attenuation amount or the first attenuation rate of the indoor ambient temperature.

Here, the first defrost decay correlation includes one or more first decay amounts Δ T_{Indoor use}A correspondence to a first target adjustment value, or, alternatively, one or more first decay rates V_{Indoor use}A correspondence with a first target adjustment value. Illustratively, an alternative Δ T is shown in Table 1_{Indoor use}The correspondence with the first target adjustment value, as shown in the following table,

TABLE 1

△T_{Indoor use}(unit:. degree.C.)	First target adjustment value (unit: B)
		a1＜△T_{Indoor use}≤a2	K11
a2＜△T_{Indoor use}≤a3	K12
		a3＜△T_{Indoor use}	K13

In the corresponding relation, the first target adjustment value and delta T_{Indoor use}Is positively correlated. I.e. delta T_{Indoor use}The larger the value of the target adjustment value is, the larger the temperature change of the indoor environment is, the larger the adverse effect of the bypass defrosting mode on the indoor environment is, and the larger the defrosting capacity attenuation of the bypass defrosting mode is, so that the higher the value is set to the first target adjustment value, the refrigerant quantity of the refrigerant circulation circuit is increased, most of the refrigerant can flow through the compressor through the refrigerant circulation circuit for heating, the temperature and the flow of the refrigerant flowing back to the compressor are increased as soon as possible, and the current performance of the compressor is improved.

Therefore, when the operation of increasing the refrigerant flow rate of the refrigerant circulation loop defrosting bypass branch in step S103 is performed, the first target adjustment value may be determined according to the first defrosting attenuation correlation, and then the refrigerant flow rate of the refrigerant circulation loop may be adjusted according to the first target adjustment value.

Optionally, when the defrosting attenuation parameter is the second attenuation amount or the second attenuation rate of the coil temperature, the corresponding second target adjustment value may be obtained from the second defrosting attenuation correlation relationship according to the second attenuation amount or the second attenuation rate of the coil temperature.

Here, the second defrost decay correlations include one or more second decay amounts Δ T_{Coil pipe}A correspondence to a second target adjustment value, or, alternatively, one or more second decay rates V_{Coil pipe}And a correspondence with a second target adjustment value. Illustratively, an alternative Δ T is shown in Table 2_{Coil pipe}The correspondence with the second target adjustment value, as shown in the following table,

TABLE 2

△T_{Coil pipe}(unit:. degree.C.)	Second target adjustment value (unit: B)
		b1＜△T_{Coil pipe}≤b2	K21
b2＜△T_{Coil pipe}≤b3	K22
		b3＜△T_{Coil pipe}	K23

In the corresponding relation, the second target adjustment value and delta T_{Coil pipe}Is positively correlated. I.e. delta T_{Coil pipe}The larger the value of the target adjustment value is, the larger the temperature change of the coil of the indoor heat exchanger is, the larger the adverse effect of the bypass defrosting mode on the heating performance of the indoor heat exchanger is, and the larger the attenuation of the defrosting capacity of the bypass defrosting mode is, so that the higher the value of the second target adjustment value is set to increase the amount of the refrigerant passing through the refrigerant circulation loop, and the purpose of improving the current performance of the compressor can be achieved.

Therefore, when the operation of increasing the refrigerant flow rate of the refrigerant circulation loop defrosting bypass branch in step S103 is performed, the second target adjustment value may be determined according to the second defrosting attenuation correlation, and then the refrigerant flow rate of the refrigerant circulation loop may be adjusted according to the second target adjustment value.

In the above embodiments, the air conditioners may select one of the defrost attenuation correlations to determine the corresponding heating parameters according to actual needs.

Optionally, the specifically selected rate association relationship may be determined according to a cold and hot load of the current air conditioner, for example, when the cold and hot load of the current air conditioner is low, the first defrosting attenuation association relationship is selected, and the indoor ambient temperature is mainly used as a reference factor; and when the cold and hot load of the current air conditioner is higher, the second defrosting attenuation correlation relation is selected, and at the moment, the system pressure of the air conditioner is also greatly influenced by the higher cold and hot load, so that the temperature of a coil pipe of the indoor heat exchanger is used as a reference factor for ensuring the temperature operation of the air conditioner.

Here, the level of the cooling and heating load of the current air conditioner can be judged by parameters such as the indoor ambient temperature and the outdoor ambient temperature; for example, an indoor temperature threshold is preset in the air conditioner, and when the indoor ambient temperature is less than the indoor temperature threshold, the cold and hot loads of the air conditioner are higher; and when the indoor environment temperature is greater than or equal to the indoor temperature threshold value, the cold and hot load of the air conditioner is lower at the moment.

Of course, the air conditioning cooling and heating load may be determined by calculation of the cooling and heating load as in the related art, and further, which of the above-described defrosting attenuation correlations is used may be determined according to the specifically obtained cooling and heating load.

Therefore, in the embodiment of the disclosure, the heating operation of the air conditioner for the liquid outlet refrigerant of the outdoor heat exchanger can be triggered according to the performance change of the air conditioner compressor in the bypass defrosting process, and meanwhile, the influence of cold and hot loads on the air conditioning system can be considered, so that the accuracy of air conditioner control is improved, and the operation stability of the air conditioner is guaranteed.

In some optional embodiments, the control method for defrosting an air conditioner further comprises: and under the condition that the defrosting working parameter and the defrosting attenuation parameter are determined to meet the defrosting protection condition, the liquid outlet refrigerant of the outdoor heat exchanger is controlled to be heated.

Here, the liquid refrigerant that is heat-released and liquefied in the outdoor heat exchanger in the bypass defrosting mode can absorb heat and vaporize again by heating the liquid refrigerant of the outdoor heat exchanger, so that the temperature and the flow rate of the gaseous refrigerant in the refrigerant that flows back to the compressor can be effectively increased, and further the temperature and the flow rate of the gaseous refrigerant of the refrigerant discharged by the compressor can be increased.

Optionally, a heating device is disposed at a refrigerant liquid outlet pipeline of the air conditioner outdoor heat exchanger, and the heating device is configured to controllably heat the refrigerant flowing through the refrigerant liquid outlet pipeline; therefore, when the defrosting attenuation parameter meets the defrosting protection condition, the heating device can be controlled to be started; and if the defrosting attenuation parameter does not meet the defrosting protection condition, keeping the off state of the heating device.

In some embodiments, the heating parameter for controlling the heating of the outlet refrigerant of the outdoor heat exchanger is obtained according to the defrosting attenuation parameter or the defrosting operation parameter.

Optionally, the defrost decay parameter includes the decay amount or decay rate of the indoor ambient temperature, or the decay amount or decay rate of the coil temperature of the indoor heat exchanger, shown in the previous embodiments; the defrost operating parameters include a defrost operating parameter including a current defrost duration for the bypass defrost mode.

Illustratively, the step of obtaining the heating parameter based on the defrost decay parameter comprises: and acquiring corresponding heating parameters from the third defrosting attenuation correlation relation according to the defrosting attenuation parameters. Here, the third defrost decay correlation includes a correspondence of one or more defrost decay parameters to heating parameters. Therefore, the corresponding heating parameter can be obtained by matching in the third defrost decay correlation. And then the effluent liquid refrigerant of the outdoor heat exchanger can be heated according to the heating parameter control.

Similarly, the step of obtaining the heating parameter based on the defrost operating parameter comprises: and acquiring corresponding heating parameters from the associated relation of the defrosting operation according to the defrosting operation parameters. Here, the relationship of the defrosting operation includes a correspondence between one or more defrosting operation parameters and heating parameters. Therefore, the corresponding heating parameters can be obtained in a matching manner in the defrosting operation association relation so as to control the heating of the effluent liquid refrigerant of the outdoor heat exchanger.

The embodiment of the disclosure heats the liquid refrigerant of the outdoor heat exchanger according to the heating parameter control, the heating parameter setting of the heating mode is more flexible, and the current defrosting working condition can be adapted, so that the accurate control of the liquid refrigerant heating can be realized, and meanwhile, the method and the device also have the advantages of energy saving and consumption reduction.

In some optional embodiments, the control method for defrosting an air conditioner further comprises: and under the condition that the defrosting working parameter and the defrosting attenuation parameter are determined not to meet the defrosting protection condition, controlling to stop heating the liquid outlet refrigerant of the outdoor heat exchanger.

Here, when the defrost decay parameter does not satisfy the defrost protection condition, it is described that the bypass defrost mode of the current operation of the air conditioner is restored to the defrost capacity capable of satisfying the current defrost requirement for the outdoor heat exchanger, and therefore, the heating of the outlet refrigerant of the outdoor heat exchanger is controlled to be stopped, so as to reduce the power resource consumed by maintaining the continuous operation of the heating device.

In some optional embodiments, the control method for defrosting an air conditioner further comprises: under the condition that the defrosting working parameter and the defrosting attenuation parameter are determined to meet the defrosting protection condition, acquiring the defrosting protection condition corresponding to the next bypass defrosting mode from the condition set; and the threshold value in the defrosting protection condition corresponding to the next entering of the bypass defrosting mode is smaller than the corresponding threshold value in the current defrosting protection condition.

Here, the air conditioning control system of the present application stores a condition set including a plurality of defrost protection conditions using different combinations of threshold settings, for example, where one defrost protection condition a is Δ T_{Indoor use}Δ T11, and T_Defrosting≥t1_{Threshold value}(ii) a And the other defrosting protection condition B is delta T_{Indoor use}Δ T12, and T_Defrosting≥t2_{Threshold value}. In the above set of conditions, Δ T11 is less than Δ T12, T1_{Threshold value}Less than t2_{Threshold value}. Therefore, for example, in the current control flow, the defrosting protection condition a is adopted to control whether to heat the liquid outlet refrigerant of the outdoor heat exchanger, and when the defrosting operation parameter and the defrosting attenuation parameter meet the defrosting protection condition, optionally, the defrosting protection condition corresponding to the next bypass defrosting mode is enteredThe defrost protection condition B is selected.

In the embodiment of the disclosure, the threshold value in the defrosting protection condition corresponding to the next time of entering the bypass defrosting mode is smaller than the threshold value corresponding to the current defrosting protection condition, so that the heating operation of the liquid outlet refrigerant of the outdoor heat exchanger can be triggered more easily when the bypass defrosting mode is entered next time, the disturbance influence on the indoor environment temperature under the condition that the bypass defrosting mode is continuously and repeatedly triggered is reduced, the defrosting capability of the air conditioner in the process of repeatedly running the bypass defrosting mode can be improved more timely and rapidly, and the defrosting effect is ensured.

Fig. 2 is a schematic structural diagram of a control device for defrosting an air conditioner according to an embodiment of the present disclosure.

The embodiment of the present disclosure provides a control device for defrosting of an air conditioner, which is structurally shown in fig. 3 and includes:

a processor (processor)200 and a memory (memory)201, and may further include a Communication Interface (Communication Interface)202 and a bus 203. The processor 200, the communication interface 202 and the memory 201 can communicate with each other through the bus 203. The communication interface 202 may be used for information transfer. The processor 200 may call logic instructions in the memory 201 to perform the control method for defrosting the air conditioner of the above embodiment.

In addition, the logic instructions in the memory 201 may be implemented in the form of software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products.

The memory 201 is a computer-readable storage medium, and can be used for storing software programs, computer-executable programs, such as program instructions/modules corresponding to the methods in the embodiments of the present disclosure. The processor 200 executes functional applications and data processing by executing program instructions/modules stored in the memory 201, that is, implements the control method for defrosting an air conditioner in the above-described method embodiment.

The memory 201 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. Further, the memory 201 may include a high-speed random access memory, and may also include a nonvolatile memory.

As shown in fig. 3, the present disclosure also provides an air conditioner, including:

the refrigerant circulation loop is formed by connecting an outdoor heat exchanger 11, an indoor heat exchanger 12, a throttling device 13 and a compressor 14 through refrigerant pipelines;

one end of the defrosting bypass branch 21 is communicated with an exhaust port of the compressor 14, and the other end of the defrosting bypass branch is communicated with a refrigerant outlet pipeline of the outdoor heat exchanger 11 in the heating mode; the defrosting bypass branch 21 is provided with a control valve 22;

and a control device (not shown in the figure) for defrosting the air conditioner is electrically connected with the throttling device 13. Here, the control device for air conditioner defrosting is the control device shown in the foregoing embodiment.

The air conditioner adopting the structural design can control and increase the refrigerant flow of the refrigerant circulation loop according to the defrosting attenuation parameter and the defrosting working parameter in the process of the bypass defrosting mode of the air conditioner running, and the refrigerant flow of the refrigerant circulation loop is increased due to the unchanged power of the compressor, so that the high-temperature refrigerant flow which is branched by the defrosting bypass branch and used for defrosting can be reduced, the adverse effect of dual reduction of the temperature and the flow of the gaseous return air refrigerant of the compressor caused by the fact that excessive refrigerants are used for defrosting is reduced, and the problem that the defrosting capacity of the air conditioner is reduced along with the time caused by the bypass defrosting mode running is further reduced.

Embodiments of the present disclosure also provide a computer-readable storage medium storing computer-executable instructions configured to perform the above-described method for defrosting an air conditioner.

Embodiments of the present disclosure also provide a computer program product comprising a computer program stored on a computer-readable storage medium, the computer program comprising program instructions that, when executed by a computer, cause the computer to perform the above-described method for defrosting an air conditioner.

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

The technical solution of the embodiments of the present disclosure may be embodied in the form of a software product, where the computer software product is stored in a storage medium and includes one or more instructions to enable a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method of the embodiments of the present disclosure. And the aforementioned storage medium may be a non-transitory storage medium comprising: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes, and may also be a transient storage medium.

The above description and drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The scope of the disclosed embodiments includes the full ambit of the claims, as well as all available equivalents of the claims. As 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, a first element could be termed a second element, and, similarly, a second element could be termed a first element, unless the meaning of the description changes, so long as all occurrences of the "first element" are renamed consistently and all occurrences of the "second element" are renamed consistently. The first and second elements are both elements, but may not be the same element. Furthermore, the words used in the specification are words of description only and are not intended to limit the claims. As used in the description of the embodiments and 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 encompass any and all possible combinations of one or more of the associated listed. Furthermore, the terms "comprises" and/or "comprising," when used in this application, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Without further limitation, an element defined by the phrase "comprising an …" does not exclude the presence of other like elements in a process, method or apparatus that comprises the element. In this document, each embodiment may be described with emphasis on differences from other embodiments, and the same and similar parts between the respective embodiments may be referred to each other. For methods, products, etc. of the embodiment disclosures, reference may be made to the description of the method section for relevance if it corresponds to the method section of the embodiment disclosure.

Those of skill in the art would appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software may depend upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the disclosed embodiments. It can be clearly understood by the skilled person that, for convenience and brevity of description, the specific working processes of the system, the apparatus and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the embodiments disclosed herein, the disclosed methods, products (including but not limited to devices, apparatuses, etc.) may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units may be merely a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form. The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to implement the present embodiment. In addition, functional units in the embodiments of the present disclosure may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are 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, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown 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 description corresponding to the flowcharts and block diagrams in the figures, operations or steps corresponding to different blocks may also occur in different orders than disclosed in the description, and sometimes there is no specific order between the different operations or steps. For example, two sequential operations or steps may in fact be executed substantially concurrently, or they may sometimes be executed 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 by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

Claims

1. a control method for air-conditioning defrosting, is characterized in that, comprises:

Obtaining the defrosting working parameters and defrosting attenuation parameters during the bypass defrosting mode of the air conditioner operation; wherein the bypass defrosting mode includes introducing the refrigerant discharged from the compressor into the outdoor heat exchanger through the defrosting bypass branch, The defrosting working parameter includes the current defrosting duration of the bypass defrosting mode, and the defrosting attenuation parameter includes the first attenuation amount or the first attenuation rate of the indoor ambient temperature, or the coil temperature of the indoor heat exchanger. The second decay amount or second decay rate of ;

Determine whether the defrost protection condition is satisfied according to the current defrost duration and the defrost attenuation parameter;

When it is determined that the current defrosting duration and the defrosting attenuation parameter satisfy the defrosting protection condition, increase the refrigerant flow of the refrigerant circulation circuit;

Wherein, before increasing the refrigerant flow of the refrigerant circulation loop, the method further includes: obtaining an adjustment range value of the refrigerant flow; wherein, when the refrigerant flow of the refrigerant circulation loop is adjusted within the adjustment range value, the indoor corresponding to the air conditioner The ambient temperature is within the set temperature range; a target adjustment value is determined from the adjustment range value of the refrigerant flow, and the target adjustment value is used to represent the adjustment range for increasing the refrigerant flow of the refrigerant circulation loop;

The defrost protection conditions include:

△T _room ≥△T1, V _room ≥V1, △T _coil ≥△T2, or V _coil ≥V2;

And t _defrost ≥ t _threshold ;

ΔT is the first attenuation of the _indoor ambient temperature, ΔT1 is the first temperature attenuation threshold, V is the first attenuation rate of the _indoor ambient temperature, V1 is the first rate attenuation threshold, ΔT _coil is the second attenuation of the coil temperature of the indoor heat exchanger, ΔT2 is the second temperature attenuation threshold, V _coil is the second attenuation rate of the coil temperature of the indoor heat exchanger, and V2 is the second Rate attenuation threshold; tdefrost is the current _defrost duration of the bypass defrost mode, and tthreshold _is the duration threshold.

2. The control method according to claim 1, wherein the determining the target adjustment value from the adjustment range value of the refrigerant flow comprises:

According to the defrosting attenuation parameter, obtain the corresponding target adjustment value from the adjustment range value according to the first correlation relationship;

Wherein, the first association relationship includes a corresponding relationship between one or more defrost attenuation parameters and an adjustment value in the adjustment range value.

3. The control method according to claim 1, further comprising:

In the case that it is determined that the current defrosting duration and the defrosting attenuation parameter satisfy the defrosting protection condition, control to heat the effluent refrigerant of the outdoor heat exchanger.

4 . The control method according to claim 3 , wherein the heating parameter for controlling the heating of the effluent refrigerant of the outdoor heat exchanger is obtained according to the defrosting attenuation parameter or the current defrosting duration. 5 .

5. The control method according to claim 3, characterized in that, further comprising:

In the case that it is determined that the current defrosting duration and the defrosting attenuation parameter do not meet the defrosting protection conditions, the control stops heating the effluent refrigerant of the outdoor heat exchanger.

6. The control method according to claim 1, further comprising:

When it is determined that the current defrost duration and the defrost attenuation parameter satisfy the defrost protection condition, obtain the defrost protection condition corresponding to the next entry into the bypass defrost mode from the condition set;

Wherein, the threshold value in the defrost protection condition corresponding to the next entry into the bypass defrost mode is smaller than the corresponding threshold value in the current defrost protection condition.

7. 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 6 when executing the program instructions Any one of the control methods for defrosting an air conditioner.

8. 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;

One end of the defrosting bypass branch is connected with the exhaust port of the compressor, and the other end is connected with the refrigerant inlet pipeline of the outdoor heat exchanger in the heating mode; the defrosting bypass branch The road is provided with a control valve;

The control device for air conditioner defrosting according to claim 7, which is electrically connected to the throttle device.