CN110736201B

CN110736201B - Control method and control device for defrosting of air conditioner and air conditioner

Info

Publication number: CN110736201B
Application number: CN201910911863.7A
Authority: CN
Inventors: 许文明; 王飞; 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: 2022-04-19
Anticipated expiration: 2039-09-25
Also published as: CN110736201A

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: acquiring a defrosting attenuation parameter under the condition that the air conditioner enters a bypass defrosting mode; and if the defrosting attenuation parameter meets the heating starting condition, controlling to heat the liquid outlet refrigerant of the outdoor heat exchanger. The control method provided by the embodiment of the disclosure can control the heating of the liquid refrigerant of the outdoor heat exchanger under the condition that the air conditioner enters the bypass defrosting mode, so that the liquid refrigerant in the liquid refrigerant of the outdoor heat exchanger is heated into the gaseous refrigerant, the temperature and the flow of the gaseous refrigerant in the return air refrigerant of the compressor are effectively improved, and the problem that the defrosting capacity of the air conditioner is reduced along with the time caused by the operation of the bypass defrosting mode is solved. The application also discloses a controlling means and air conditioner for the air conditioner defrosting.

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 the first single-cold 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 frost is formed to a certain thickness, the heating capacity of the air conditioner is lower and lower, so that the defrosting function is an important research subject 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 a defrosting attenuation parameter under the condition that the air conditioner enters a bypass defrosting mode; 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;

and if the defrosting attenuation parameter meets the heating starting condition, controlling to heat the liquid outlet refrigerant of the outdoor heat exchanger.

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 liquid inlet pipeline of the outdoor heat exchanger in the heating mode; the defrosting bypass branch is provided with a control valve;

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

the control device for defrosting the air conditioner as in some of the previous embodiments is electrically connected with the control valve and the heating 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:

according to the control method for defrosting of the air conditioner, the liquid refrigerant of the outdoor heat exchanger can be heated according to the defrosting attenuation parameter and the heating starting condition under the condition that the air conditioner enters the bypass defrosting mode, so that the liquid refrigerant in the liquid refrigerant of the outdoor heat exchanger is heated into the gaseous refrigerant, the temperature and the flow of the gaseous refrigerant in the return air refrigerant of the compressor are effectively improved, and the problem that the defrosting capacity of the air conditioner is reduced along with the time due to the operation of the bypass defrosting mode is solved.

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 a defrosting attenuation parameter under the condition that the air conditioner enters a bypass defrosting mode;

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, the other part 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 a return air parameter of the compressor.

In the process of the bypass defrosting mode in the air conditioner operation step S101, since a large amount of refrigerant directly flows to the outdoor heat exchanger for defrosting, the refrigerant after heat release changes from a gaseous state to a liquid state, and the refrigerant evaporation function of the outdoor heat exchanger is suppressed, so that the liquid refrigerant and the gaseous refrigerant in the air conditioner refrigerant circulation circuit are increased, and the return air temperature and the return air flow rate of the compressor are reduced. Therefore, the change of the return air parameter of the compressor can reflect the change influence of the performance parameter of the air conditioner compressor caused by the progress of the bypass defrosting mode to a certain extent. Therefore, in the embodiment of the present disclosure, the return air parameter of the compressor is used as a reference parameter for control adjustment in the subsequent step.

Here, the return air parameter of the compressor includes a return air temperature of the compressor, and/or a return air pressure.

In some optional embodiments of the present disclosure, a temperature sensor is disposed at the air return end of the compressor, and the temperature sensor may be configured to detect a real-time temperature of the refrigerant flowing through the air return end of the compressor; therefore, in the embodiment of the present disclosure, the real-time temperature of the refrigerant detected by the temperature sensor is used as the return air temperature of the compressor.

Similarly, the air return end of the compressor is provided with a pressure sensor which can be used for detecting the real-time pressure of the refrigerant flowing through the air return end of the compressor; therefore, in the embodiment of the present disclosure, the real-time pressure of the refrigerant detected by the pressure sensor is used as the return pressure of the compressor.

In other embodiments, the defrost decay parameter obtained in step S101 is a discharge parameter of the compressor.

Here, when the compression power of the compressor is not changed, and the air return parameter of the compressor is negatively affected by the bypass defrosting mode, and the air discharge parameter of the compressor is also decreased, so that the change of the air discharge parameter of the compressor can reflect the change influence of the performance parameter of the air conditioner compressor caused by the proceeding of the bypass defrosting mode to a certain extent. Therefore, the embodiments of the present disclosure may also select the discharge parameter of the compressor as the reference parameter for performing the control adjustment in the subsequent step.

Here, the discharge parameter of the compressor includes a discharge temperature of the compressor, and/or a discharge pressure.

In some optional embodiments of the present disclosure, the discharge end of the compressor is provided with a temperature sensor, and the temperature sensor may be configured to detect a real-time temperature of the refrigerant flowing through the discharge end of the compressor; therefore, in the embodiment of the present disclosure, the real-time temperature of the refrigerant detected by the temperature sensor is used as the discharge temperature of the compressor.

Similarly, the exhaust end of the compressor is provided with a pressure sensor which can be used for detecting the real-time pressure of the refrigerant flowing through the exhaust end of the compressor; therefore, in the embodiment of the present disclosure, the real-time pressure of the refrigerant detected by the pressure sensor is used as the discharge pressure of the compressor.

It should be understood that the defrost decay parameters of the present application include, but are not limited to, the return and discharge parameters of the compressor 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.

And S102, if the defrosting attenuation parameter meets the heating starting condition, controlling to heat the liquid outlet refrigerant of the outdoor heat exchanger.

Optionally, when the defrosting attenuation parameter obtained in step S101 is the return air parameter of the compressor, the heating start condition may be set to any one of the following conditions: (1) t is_{Return air}＜T_{Threshold value of return air}；(2)P_{Return air}＜P_{Threshold value of return air}；(3)T_{Return air}＜T_{Threshold value of return air}And, P_{Return air}＜P_{Threshold value of return air}(ii) a Wherein, T_{Return air}For return air temperature, T_{Threshold value of return air}Is the return air temperature threshold, P_{Return air}For return air pressure, P_{Threshold value of return air}Is the return air pressure threshold.

In the above optional embodiment, the numerical value comparison between the return air parameters (return air temperature, return air pressure) and the return air thresholds corresponding thereto is mainly used as the heating start condition; here, the air return threshold is generally used as a threshold value for measuring the influence of the bypass defrosting mode of the air conditioner on the performance of the compressor, and when the air return parameter is higher than the air return threshold, the influence of the bypass defrosting mode on the performance of the compressor is small, so that the current and subsequent defrosting capabilities of the air conditioner can be still kept in a better state; and when the air return parameter is lower than the air return threshold value, the bypass defrosting mode has a large influence on the performance of the compressor, so that the current and subsequent defrosting capacities of the air conditioner are greatly weakened. In this way, by comparing the magnitude of the return air parameter with the return air threshold, it can be determined whether to perform the subsequent steps to improve the defrosting capability of the air conditioner.

Alternatively, when the defrost decay parameter acquired in step S101 is the discharge parameter of the compressor, the heating start condition may be set to any one of the following conditions: (1) t is_{Exhaust of gases}＜T_{Exhaust threshold}；(2)P_{Exhaust of gases}＜P_{Exhaust threshold}；(3)T_{Exhaust of gases}＜T_{Exhaust threshold}And, P_{Exhaust of gases}＜P_{Exhaust threshold}(ii) a Wherein, T_{Exhaust of gases}To exhaust temperature, T_{Exhaust threshold}Is an exhaust gas temperature threshold, P_{Exhaust of gases}Is the exhaust pressure, P_{Exhaust threshold}Is an exhaust pressure threshold.

In the above alternative embodiment, the numerical comparison between the exhaust parameters (exhaust temperature, exhaust pressure) and their corresponding exhaust thresholds is mainly used as the heating start condition; here, the air discharge threshold value may also be a threshold value for measuring the influence of the bypass defrosting mode of the air conditioner on the performance of the compressor, and when the air discharge parameter is higher than the air discharge threshold value, the influence of the bypass defrosting mode on the performance of the compressor is small, so as to reflect that the current and subsequent defrosting capabilities of the air conditioner can still be kept in a better state; and when the exhaust parameter is lower than the exhaust threshold, the bypass defrosting mode has a large influence on the performance of the compressor, so that the current and subsequent defrosting capabilities of the air conditioner are greatly weakened. In this way, by comparing the value of the exhaust parameter with the exhaust threshold value, the function of judging whether to execute the subsequent steps to improve the defrosting capability of the air conditioner can be achieved.

Still alternatively, when the defrost decay parameter acquired in step S101 includes the discharge parameter and the return parameter of the compressor, the heating-on condition may be set to any one of the following conditions: (1) t is_{Exhaust of gases}＜T_{Exhaust threshold}And, T_{Return air}＜T_{Threshold value of return air}；(2)P_{Exhaust of gases}＜P_{Exhaust threshold}And, P_{Return air}＜P_{Threshold value of return air}；(3)T_{Exhaust of gases}-T_{Return air}＜△T_{Threshold value}And/or, P_{Exhaust of gases}-P_{Return air}＜△P_{Threshold value}(ii) a Wherein, Delta T_{Threshold value}Is the threshold value of temperature difference, Δ P_{Threshold value}Is the differential pressure threshold.

In the above alternative embodiment, the common influence of the bypass defrosting mode on the return and exhaust parameters of the compressor is comprehensively considered; compared with the two embodiments which only use the return air parameter or the exhaust parameter as the heating starting condition, the embodiment of the disclosure can judge whether the defrosting capacity of the air conditioner is reduced more accurately, and is beneficial to improving the control precision of the control flow of the application.

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

In the embodiment of the present disclosure, when the defrosting decay parameter in step S102 satisfies the heating start 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, in step S102, if the defrost decay parameter satisfies the heating start condition, the heating device may be controlled to be turned on; and if the defrosting attenuation parameter does not meet the heating opening condition, keeping the off state of the heating device.

In one embodiment, the heating device is an electromagnetic heating device, which heats the refrigerant pipeline by using the principle of electromagnetic induction heating, and then conducts heat to the refrigerant flowing through the refrigerant pipeline by using the refrigerant pipeline, so as to heat the refrigerant.

The electromagnetic heating device mainly comprises an induction coil and a power supply module, wherein the induction coil is wound on the refrigerant pipeline section, and the power supply module can provide alternating current for the induction coil; when the induction coil is electrified, alternating current flowing through the induction coil generates an alternating magnetic field passing through the refrigerant pipe section, and the alternating magnetic field can generate eddy currents in the refrigerant pipe section, so that the heating and warming effects can be realized by means of the energy of the eddy currents.

It should be understood that the type of the heating device for heating the refrigerant is not limited to the above electromagnetic heating device, and other types of heating devices capable of directly or indirectly heating the refrigerant in the related art may also apply the technical solution of the present application and are covered by the protection scope of the present application.

In some optional embodiments, the manner of controlling the liquid refrigerant outlet of the outdoor heat exchanger to be heated in step S102 may be to heat the liquid refrigerant outlet of the outdoor heat exchanger in a preset heating mode. Here, the preset heating mode includes: a predetermined fixed heating rate (e.g., set to a heating ramp rate of 2 ℃/min), or a predetermined fixed heating period (e.g., 5 minutes, 10 minutes).

The mode of starting heating in the preset heating mode 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 an embodiment, the step S102 of controlling to heat the liquid refrigerant of the outdoor heat exchanger includes: determining heating parameters; and controlling the liquid outlet refrigerant of the outdoor heat exchanger to be heated according to the heating parameters.

The embodiment of the disclosure heats the liquid refrigerant of the outdoor heat exchanger according to the determined 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 advantages of energy saving and consumption reduction are also achieved.

Optionally, the heating parameter comprises a heating rate or a heating time period.

In some embodiments, the step of determining the heating parameter comprises: and acquiring corresponding heating parameters from the correlation of the defrosting attenuation according to the defrosting attenuation parameters.

Here, the defrosting attenuation parameter can reflect the influence change of the defrosting bypass mode of the air conditioner operation on the performance of the compressor, and the heating operation on the outlet refrigerant of the outdoor heat exchanger in the step S102 is used for improving the performance of the compressor. Therefore, the step of determining the heating parameter in the embodiment of the disclosure is a closed-loop feedback control mode, and the control accuracy is higher and the response speed is fast.

Optionally, when the defrosting attenuation parameter is the return air temperature or the exhaust air temperature, the corresponding heating parameter may be obtained from the first defrosting attenuation association relationship according to Δ T1, Δ T2, or Δ T3; wherein Δ T1 is a first temperature difference between the exhaust temperature and an exhaust temperature threshold, Δ T2 is a second temperature difference between the return air temperature and a return air temperature threshold, and Δ T3 is a temperature difference between the exhaust temperature and the return air temperature.

Here, the first defrost decay correlation includes a correspondence of one or more Δ T1 to heating parameters, or a correspondence of one or more Δ T2 to heating parameters, or a correspondence of one or more Δ T3 to heating parameters. Illustratively, an optional Δ T1 is shown in table 1 in relation to heating parameters, as shown in the following table,

TABLE 1

In the corresponding relation, the heating rate is positively correlated with the delta T1, and the heating time length is positively correlated with the delta T1. That is, the larger the value of Δ T1, the lower the discharge temperature of the compressor, the greater the influence of the bypass defrosting mode on the performance of the compressor, so the heating rate and the heating time period are set to be higher values, and the temperature and the flow rate of the refrigerant returning to the compressor are increased as fast as possible by heating, so as to improve the current performance of the compressor.

Therefore, when the operation of heating the outlet refrigerant of the outdoor heat exchanger in step S102 is performed, the heating parameter may be determined according to the first defrost decay correlation, and then the heating may be performed according to the heating parameter.

Optionally, when the defrosting attenuation parameter is the return air pressure or the exhaust pressure, the corresponding heating parameter may be obtained from the second defrosting attenuation association relationship according to Δ P1, Δ P2, or Δ P3; wherein Δ P1 is a first pressure difference between the exhaust pressure and an exhaust pressure threshold, Δ P2 is a second pressure difference between the return pressure and a return pressure threshold, and Δ P3 is a pressure difference between the exhaust pressure and the return pressure.

Here, the second defrost decay correlation includes a correspondence of one or more Δ P1 with the heating parameter, or a correspondence of one or more Δ P2 with the heating parameter, or a correspondence of one or more Δ P3 with the heating parameter. Illustratively, an optional Δ P1 is shown in table 2 in relation to heating parameters, as shown in the following table,

TABLE 2

Delta P1 (Unit: MPa)	Heating Rate (Unit:. degree. C/min)	Heating time (unit: min)
			b1＜△P1≤b2	v21	t21
b2＜△P1≤b3	v22	t22
			b3＜△P1	v23	t23

In the corresponding relation, the heating rate is positively correlated with the delta P1, and the heating time length is positively correlated with the delta P1. That is, the larger the value of Δ P1, the lower the discharge pressure of the compressor, the greater the influence of the bypass defrosting mode on the performance of the compressor, so the heating rate and the heating time period are set to be higher values, and the temperature and the flow rate of the refrigerant returning to the compressor are increased as fast as possible by heating, so as to improve the current performance of the compressor.

Therefore, when the operation of heating the outlet refrigerant of the outdoor heat exchanger in step S102 is performed, the heating parameter may be determined according to the second defrost decay correlation, and then the heating may be performed according to the heating parameter.

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 current cold and hot load of the air conditioner, for example, when the current cold and hot load of the air conditioner is low, the first defrost decay association relationship is selected, and the temperature of the refrigerant of the return exhaust gas of the compressor 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 pressure of the refrigerant of the back exhaust of the compressor is taken as a reference factor in order to ensure 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 still other embodiments, the step of determining the heating parameter comprises: and acquiring corresponding heating parameters from the associated relation of the defrosting operation according to the defrosting operation parameters.

Optionally, the defrosting operation parameter is a parameter when the air conditioner executes the bypass defrosting mode, and the defrosting operation parameter can reflect the defrosting capability of the bypass defrosting mode, so that the corresponding heating parameter is determined by using the parameter capable of reflecting the defrosting capability of the bypass defrosting mode in the embodiment of the disclosure. For example, the defrost operating parameter includes a bypass refrigerant parameter of the refrigerant flowing through the defrost bypass.

In the embodiment of the present disclosure, the branch refrigerant parameter includes a branch refrigerant temperature, a branch refrigerant pressure, and/or a branch refrigerant flow rate.

Optionally, the air conditioner is provided with a temperature sensor on the defrosting bypass branch, wherein the temperature sensor can be used for detecting the temperature of the refrigerant flowing through the defrosting bypass branch, and the temperature of the refrigerant detected by the temperature sensor is used as the branch refrigerant temperature; optionally, the air conditioner is provided with a pressure sensor on the defrosting bypass branch, wherein the pressure sensor can be used for detecting the pressure of the refrigerant flowing through the defrosting bypass branch, and the pressure of the refrigerant detected by the pressure sensor is used as the branch refrigerant pressure; optionally, the air conditioner is provided with a flow meter on the defrosting bypass branch, the flow meter being capable of detecting a refrigerant flow flowing through the defrosting bypass branch, and the refrigerant flow detected by the flow meter is used as the branch refrigerant flow.

In an optional embodiment, according to the defrosting operation parameter, the corresponding heating parameter is obtained from the defrosting operation association relationship, and the steps include: and acquiring corresponding heating parameters from the first defrosting operation association relation according to branch refrigerant parameters of the refrigerant flowing through the defrosting bypass branch.

Illustratively, an optional bypass refrigerant temperature T is shown in Table 3_{Branch circuit}The correspondence with the heating parameters, as shown in the following table,

TABLE 3

T_{Branch circuit}(unit:. degree.C.)	Heating Rate (Unit:. degree. C/min)	Heating time (unit: min)
			c1＜T_{Branch circuit}≤c2	v31	t31
c2＜T_{Branch circuit}≤c3	v32	t32
			c3＜T_{Branch circuit}	v33	t33

In the corresponding relation, the heating rate and the branch refrigerant temperature are in negative correlation, and the heating duration and the branch refrigerant temperature are in negative correlation.

Therefore, when the operation of heating the outlet refrigerant of the outdoor heat exchanger in step S102 is performed, the heating parameter may be determined according to the first defrosting operation association relationship, and then the heating may be performed according to the heating parameter.

In another optional embodiment, according to the defrosting operation parameter, the corresponding heating parameter is obtained from the defrosting operation association relationship, and the steps include: and acquiring corresponding heating parameters from the second defrosting operation association relation according to the branch refrigerant parameters and the main refrigerant parameters.

The main path refrigerant parameter is the parameter of the refrigerant entering the outdoor heat exchanger through the refrigerant circulation loop. For example, the main refrigerant parameter includes a main refrigerant temperature, a main refrigerant pressure, and/or a main refrigerant flow rate. The main path refrigerant parameter can not only indirectly reflect the performance change of the compressor influenced by the defrosting process, but also influence the actual defrosting effect of the air conditioner due to the parameter change because the main path refrigerant is mixed with the branch path refrigerant and then enters the outdoor heat exchanger for defrosting.

Optionally, the air conditioner is provided with a temperature sensor on a refrigerant inlet pipeline of the outdoor heat exchanger, wherein the temperature sensor can be used for detecting the temperature of the refrigerant flowing through the defrosting bypass branch, and the temperature of the refrigerant detected by the temperature sensor is used as the temperature of the refrigerant in the main path; optionally, the air conditioner is provided with a pressure sensor on a refrigerant inlet pipeline of the outdoor heat exchanger, wherein the pressure sensor can be used for detecting the pressure of the refrigerant flowing through the defrosting bypass branch, and the pressure of the refrigerant detected by the pressure sensor is used as the pressure of the refrigerant in the main path; optionally, the air conditioner is provided with a flow meter on a refrigerant inlet pipeline of the outdoor heat exchanger, and the flow meter is used for detecting a refrigerant flow flowing through the defrosting bypass branch, so that the refrigerant flow detected by the flow meter is used as a main path refrigerant flow.

Exemplarily, an optional main path refrigerant parameter T is shown in table 4_{Main road}Branch refrigerant temperature T_{Branch circuit}The correspondence with the heating parameters, as shown in the following table,

TABLE 4

Therefore, when the operation of heating the outlet refrigerant of the outdoor heat exchanger in step S102 is performed, the heating parameter may be determined according to the second defrosting operation association relationship, and then the heating may be performed according to the heating parameter.

In some optional embodiments, the control method for defrosting an air conditioner further comprises: and if the defrosting attenuation parameter does not meet the heating starting condition, controlling to stop heating the liquid outlet refrigerant of the outdoor heat exchanger.

Here, when the defrosting decay parameter does not satisfy the heating start condition, it is described that the bypass defrosting mode of the current operation of the air conditioner is restored to the defrosting capacity capable of satisfying the current defrosting 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 resources consumed by maintaining the continuous operation of the heating device.

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. 2 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 inlet pipeline of the outdoor heat exchanger 11 in the heating mode; the defrosting bypass branch 21 is provided with a control valve 22;

the heating device 3 is arranged on the refrigerant liquid outlet pipeline of the outdoor heat exchanger 11 in the heating mode and is configured to heat the refrigerant flowing through the refrigerant liquid outlet pipeline;

and a control device (not shown in the figure) for defrosting the air conditioner, which is electrically connected with the control valve 22 and the heating device 3. 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 heat the liquid refrigerant of the outdoor heat exchanger according to the defrosting attenuation parameter and the heating starting condition, so that the liquid refrigerant in the liquid refrigerant of the outdoor heat exchanger is heated into the gaseous refrigerant, the temperature and the flow of the gaseous refrigerant in the return air refrigerant of the compressor are effectively improved, and the problem that the defrosting capacity of the air conditioner is reduced along with the time due to the operation of the bypass defrosting mode is solved.

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 defrosting of an air conditioner is characterized by comprising the following steps:

acquiring a defrosting attenuation parameter under the condition that the air conditioner enters a bypass defrosting mode; the bypass defrosting mode comprises the step of guiding a refrigerant discharged by the compressor into the outdoor heat exchanger through a defrosting bypass branch;

if the defrosting attenuation parameter meets the heating starting condition, determining a heating parameter according to the defrosting attenuation parameter or the defrosting working parameter;

controlling to heat the liquid outlet refrigerant of the outdoor heat exchanger according to the heating parameters;

the defrosting working parameters comprise branch refrigerant parameters of the refrigerant flowing through the defrosting bypass branch and/or main refrigerant parameters of the refrigerant entering the outdoor heat exchanger through the refrigerant circulation loop;

the defrosting attenuation parameter comprises a discharge parameter and/or a return gas parameter of the compressor, the discharge parameter comprises a discharge pressure and/or a discharge temperature, and the return gas parameter comprises a return gas pressure and/or a return gas temperature;

the heating on condition includes:

T_{exhaust of gases}＜T_{Exhaust threshold}And/or, T_{Return air}＜T_{Threshold value of return air}(ii) a Wherein, T_{Exhaust of gases}To exhaust temperature, T_{Exhaust threshold}Is an exhaust temperature threshold, T_{Return air}For return air temperature, T_{Threshold value of return air}Is the return air temperature threshold; alternatively, the first and second electrodes may be,

P_{exhaust of gases}＜P_{Exhaust threshold}And/or, P_{Return air}＜P_{Threshold value of return air}(ii) a Wherein, P_{Exhaust of gases}Is the exhaust pressure, P_{Exhaust threshold}Is an exhaust pressure threshold, P_{Return air}For return air pressure, P_{Threshold value of return air}Is the return air pressure threshold; alternatively, the first and second electrodes may be,

T_{exhaust of gases}-T_{Return air}＜△T_{Threshold value}And/or, P_{Exhaust of gases}-P_{Return air}＜△P_{Threshold value}(ii) a Wherein, Delta T_{Threshold value}Is the threshold value of temperature difference, Δ P_{Threshold value}Is the differential pressure threshold.

2. The control method according to claim 1, wherein the heating parameter includes a heating rate or a heating time period.

3. The control method of claim 1, wherein the determining a heating parameter comprises:

and acquiring corresponding heating parameters from the correlation of defrosting attenuation according to the defrosting attenuation parameters.

4. The control method of claim 1, wherein the determining a heating parameter comprises:

and acquiring corresponding heating parameters from the associated relation of the defrosting operation according to the defrosting operation parameters.

5. The control method according to claim 4, wherein the obtaining the corresponding heating parameter from the correlation relationship of the defrosting operation according to the defrosting operation parameter comprises:

acquiring corresponding heating parameters from the first defrosting operation association relation according to branch refrigerant parameters of the refrigerant flowing through the defrosting bypass branch; alternatively, the first and second electrodes may be,

acquiring corresponding heating parameters from a second defrosting operation association relation according to the branch refrigerant parameters and the main refrigerant parameters; the main path refrigerant parameter is a parameter of a refrigerant entering the outdoor heat exchanger through a refrigerant circulation loop.

6. The control method of claim 5, wherein the branch refrigerant parameter comprises a branch refrigerant temperature, a branch refrigerant pressure, and/or a branch refrigerant flow rate;

the main path refrigerant parameters include a main path refrigerant temperature, a main path refrigerant pressure, and/or a main path refrigerant flow rate.

7. The control method according to claim 1, characterized by further comprising:

and if the defrosting attenuation parameter does not meet the heating starting condition, controlling to stop heating the liquid outlet refrigerant of the outdoor heat exchanger.

8. A control apparatus for air conditioner defrosting comprising a processor and a memory storing program instructions, characterized in that the processor is configured to execute the control method for air conditioner defrosting according to any one of claims 1 to 7 when executing the program instructions.

9. An air conditioner, comprising:

a control for defrosting an air conditioner in accordance with claim 8 electrically connected to said control valve and said heating means.