CN110736205A

CN110736205A - Control method and control device for defrosting of air conditioner and air conditioner

Info

Publication number: CN110736205A
Application number: CN201910912815.XA
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: 2020-01-31
Anticipated expiration: 2039-09-25
Also published as: CN110736205B

Abstract

The control method can control the air conditioner to enter the bypass defrosting mode after the air conditioner meets the defrosting entering condition, and heats the liquid inlet refrigerant of the outdoor heat exchanger according to the difference conditions of the respective liquid inlet temperatures before and after defrosting and during heating operation, so that the refrigerant flowing into the outdoor heat exchanger can be raised to a higher temperature, and the problem of the reduction of the defrosting capacity of the air conditioner along with the time caused by the operation of the bypass defrosting mode is solved.

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 control methods and control devices for air conditioner defrosting, and an air conditioner.

Background

With the development of science and technology, an air conditioner, which is kinds of necessary electrical equipment for ordinary people in daily life, has been gradually developed from the first single-cold machine type to an advanced machine type capable of having more functions of cooling, heating and defrosting, and here, important problems inevitably faced by air conditioning products operating in low-temperature areas or under windy and snowy weather conditions are the frosting problem of an air conditioner outdoor unit, an 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, much frost is easily condensed on the outdoor heat exchanger, and when the frost is condensed to , the heating capacity of the air conditioner is gradually lowered, so that in order to ensure the heating effect and avoid the frost from being condensed, the defrosting function gradually becomes important research subjects in the air conditioning field.

is a reverse circulation defrosting mode, when the air conditioner carries out reverse circulation defrosting, the high temperature refrigerant discharged by the compressor firstly flows through the outdoor heat exchanger to melt the frost by the heat of the refrigerant, and secondly, the bypass defrosting mode can convey the high temperature refrigerant discharged by the compressor to the outdoor heat exchanger through a bypass branch which is separately arranged when the air conditioner normally heats, and the purpose of melting the frost by 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 refrigerant directly flows to the outdoor heat exchanger for defrosting, the refrigerant after heat release is changed from a gaseous state to a 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 the flow of air return and suction of the compressor are reduced due to the step, and finally the defrosting capacity of the whole air conditioner is reduced along with the time.

Disclosure of Invention

This summary is not an extensive overview nor is intended to identify key/critical elements or to delineate the scope of such embodiments, but is intended to be a prelude to the more detailed description that is presented later.

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

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

controlling the air conditioner to enter a bypass defrosting mode in response to the air conditioner meeting a defrosting entry condition; 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;

acquiring the current liquid inlet temperature of an outdoor heat exchanger of an air conditioner;

under the condition that the current liquid inlet temperature, the initial liquid inlet temperature and the heating liquid inlet temperature meet the refrigerant temperature condition, controlling to heat a liquid inlet refrigerant of the outdoor heat exchanger;

the initial liquid inlet temperature is the liquid inlet temperature before the air conditioner enters the bypass defrosting mode, and the heating liquid inlet temperature is the average value of the liquid inlet temperature when the air conditioner operates in the heating mode.

In embodiments, a control apparatus for air conditioner defrosting includes a processor and a memory storing program instructions, the processor configured to execute, upon execution of the program instructions, a control method for air conditioner defrosting as in the previous embodiments .

In 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;

the defrosting bypass branch, wherein the end is communicated with the exhaust port of the compressor, and the end is communicated with a refrigerant liquid outlet pipeline of the outdoor heat exchanger in the heating mode;

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

the control device for defrosting the air conditioner as in the previous embodiments is electrically connected to 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:

the control method for defrosting of the air conditioner can control the air conditioner to enter a bypass defrosting mode after the air conditioner meets defrosting entering conditions, and heats the liquid inlet refrigerant of the outdoor heat exchanger according to the difference conditions of respective liquid inlet temperatures before and after defrosting and during heating operation, so that the temperature of the refrigerant flowing into the outdoor heat exchanger can be increased to a higher temperature, a better defrosting effect of the outdoor heat exchanger is realized, the temperature and the flow of the gaseous refrigerant in the return air refrigerant of the compressor can be effectively improved, and the problem that the defrosting capacity of the air conditioner is reduced along with 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

exemplary embodiments are illustrated by corresponding drawings, which are not to be construed as limiting the embodiments, in which elements having the same reference number designation are illustrated as similar elements, and in which:

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

In the following description, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments, however, or more embodiments may be practiced without these details.

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, control methods for defrosting of an air conditioner are provided in the embodiments of the present disclosure, 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, and in the embodiments, the main flow steps of the control method include:

s101, responding to the condition that the air conditioner meets defrosting entry conditions, and controlling the air conditioner to enter a bypass defrosting mode;

in , the defrosting entry condition includes that the outdoor ambient temperature is less than or equal to the frost threshold temperature and the outdoor ambient humidity is greater than or equal to the humidity threshold value, wherein, when the outdoor ambient temperature is low and the humidity is high, the water vapor in the outdoor ambient is easy to condense on the outdoor heat exchanger, so that the outdoor unit has a frosting problem, therefore, the air conditioner can automatically control to enter the bypass defrosting mode under the outdoor ambient condition.

In the above embodiment, before determining whether the air conditioner satisfies the defrosting entry condition, two environmental parameters, that is, the outdoor environment temperature and the outdoor environment humidity, need to be obtained, and it is determined whether the defrosting entry condition is satisfied.

Here, the bypass defrost mode of the present application may also be triggered by a user manual control, for example, through a remote control or an input panel of the indoor unit, and the user may select whether to enable the bypass defrost mode according to actual needs.

It should be understood that the above-described embodiments are merely exemplary, and the specific setting manner of the defrost entry condition of the present invention is not limited thereto.

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 the air-conditioning structures applied in the embodiment of the disclosure, the end of the defrosting bypass branch is connected in parallel to the exhaust port of the compressor, and the other end is connected to the refrigerant inlet end of the outdoor heat exchanger in the heating mode.

In the embodiment of the disclosure, after the air conditioner enters the bypass defrosting mode, the flow direction of the refrigerant defined by the heating mode is still kept unchanged, that is, the heating mode and the bypass defrosting mode of the air conditioner are performed simultaneously, so that parts of the refrigerant discharged by the compressor are used for defrosting, and other parts of the refrigerant can still flow in the refrigerant circulation loop, thereby ensuring the heating and warming effects on the indoor environment defined by the heating mode.

S102, acquiring the current liquid inlet temperature of an outdoor heat exchanger of the air conditioner;

in embodiments, a temperature sensor is disposed on a refrigerant inlet pipe of an outdoor heat exchanger of an air conditioner in a heating mode, and the temperature sensor can be used to detect a real-time temperature of a refrigerant flowing through the refrigerant inlet pipe, so that in the embodiments of the present disclosure, the real-time temperature of the refrigerant detected by the temperature sensor is used as a current inlet temperature.

After the air conditioner is started, the temperature sensor starts to detect; here, the air conditioner may store the real-time temperature of the refrigerant detected by the temperature sensor as history data; the history data includes temperature data at the time of heating operation of the air conditioner, temperature data before entering the bypass defrost mode, temperature data during execution of the bypass defrost mode, and the like.

In an embodiment, the current liquid inlet temperature is the temperature of a refrigerant obtained by mixing a defrosting bypass branch with the refrigerant of the refrigerant circulation loop in the bypass defrosting mode, and the defrosting effect of the outdoor heat exchanger can be directly influenced by the temperature of the refrigerant; when the current liquid inlet temperature is high, the frost of the outdoor heat exchanger is melted fast, and when the current liquid inlet temperature is low, the frost of the outdoor heat exchanger is melted slowly. Therefore, the current defrosting capacity of the air conditioner can be reflected by the current liquid inlet temperature, and the current liquid inlet temperature is selected as a reference factor for control and adjustment in the subsequent steps.

S103, under the condition that the current liquid inlet temperature, the initial liquid inlet temperature and the heating liquid inlet temperature meet the temperature condition of a refrigerant, controlling to heat a liquid inlet refrigerant of the outdoor heat exchanger;

the initial liquid inlet temperature is the liquid inlet temperature before the air conditioner enters the bypass defrosting mode, and the heating liquid inlet temperature is the average value of the liquid inlet temperature when the air conditioner operates in the heating mode. Optionally, the initial liquid inlet temperature and the heating liquid inlet temperature are stored in the air conditioning system as historical data, and therefore, when step S102 is executed, temperature data in the historical data may be retrieved to obtain the initial liquid inlet temperature and the heating liquid inlet temperature.

Here, the heating liquid inlet temperature is an average value of a plurality of liquid inlet temperatures acquired within a set time after the air conditioner reaches a stable state at the time of the heating start-up. Here, since the power of the compressor is gradually increased when the air conditioner is turned on for heating, the temperature of the refrigerant discharged therefrom also changes greatly, and after the air conditioner reaches a steady state, the temperature of the refrigerant discharged from the compressor tends to be steady. Therefore, the heating liquid inlet temperature selected by the application can effectively reduce the temperature change interference influence caused by the power change of the compressor in the heating starting process of the air conditioner.

Alternatively, the set time period is 5 to 10 minutes. The specific set time length needs to be determined according to the outdoor environment temperature when the air conditioner is started: the outdoor environment temperature is high, the influence on the liquid inlet temperature is small, and the set time length is a small numerical value; the outdoor environment temperature is low, the influence on the liquid inlet temperature is large, and the set time is a large value.

Optionally, the refrigerant temperature condition includes:

T1_{feeding liquid}＜(T_{Initial feed of liquid}+T_{Heating liquid})/2；

Wherein, T1_{Feeding liquid}At the current feed liquid temperature, T_{Initial feed of liquid}At an initial feed liquid temperature, T_{Heating liquid}The temperature is the heating liquid inlet temperature.

In the embodiment of the present disclosure, when it is determined in step S103 that the refrigerant temperature condition is satisfied, the liquid 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, an heating device is disposed on the refrigerant outlet line of the outdoor heat exchanger of the air conditioner, and the heating device is configured to controllably heat the refrigerant flowing through the refrigerant outlet line, so that in step S103, when it is determined that the temperature condition of the refrigerant is satisfied, the heating device may be controlled to be turned on, and if it is determined that the temperature condition of the refrigerant is not satisfied, the heating device is kept in a turned-off state.

In the embodiment, the heating device is an electromagnetic heating device that 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 , in some alternative embodiments, the defrosting parameter for the air conditioner to enter the bypass defrosting mode in step S101 is obtained according to the heating inlet temperature, where the heating inlet temperature is the inlet temperature when the air conditioner is operating normally for heating, and it can reflect the heating performance of the air conditioner under the condition that there is no frost formation or only a small amount of frost formation, so the bypass defrosting mode of the present application obtains the defrosting parameter by using the heating inlet temperature as a reference factor, so that the air conditioner after defrosting can still achieve the heating performance similar to that before.

Optionally, the defrosting parameter includes a refrigerant flow rate of the defrosting bypass branch. The defrosting bypass branch circuit in the embodiment of the disclosure is provided with the control valve, and the control valve can be used for controlling the on-off state of the defrosting bypass branch circuit and adjusting the flow of the refrigerant flowing through the defrosting bypass branch circuit. Therefore, the flow opening of the control valve can be adjusted according to the defrosting parameters, so that the control valve can meet the requirements of the current working condition.

Optionally, the step of obtaining the defrosting parameter of the bypass defrosting mode according to the heating liquid inlet temperature includes obtaining a corresponding defrosting parameter from the th incidence relation according to the heating liquid inlet temperature.

Where the -th relationship includes or more heating inlet temperature versus defrost parameters, exemplary alternative heating inlet temperature versus defrost parameters relationships are shown in table 1, as shown in the following table,

TABLE 1

Heating liquid inlet temperature (unit:. degree. C.)	Refrigerant flow (unit: ml/min)
		T1＜T_{Heating liquid}≤T2	Q1
T2＜T_{Heating liquid}≤T3	Q2
		T3＜T_{Heating liquid}	Q3

In the corresponding relation, the heating liquid inlet temperature is positively correlated with the refrigerant flow of the defrosting branch.

Therefore, before the air conditioner is controlled to enter the bypass defrosting mode in step S101, the defrosting parameter may be determined according to the th association relationship, and then the bypass defrosting mode may be controlled according to the defrosting parameter.

In , in some alternative embodiments, the control of the step S103 may be to heat the outlet refrigerant of the outdoor heat exchanger in a preset heating mode, where the preset heating mode includes a preset fixed heating rate (e.g. set as a heating temperature rise rate of 2 ℃/min) or a preset fixed heating time 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 alternative embodiments, the heating parameter for controlling the heating of the liquid-feeding refrigerant of the outdoor heat exchanger is obtained according to the temperature difference between the average value of the initial liquid-feeding temperature and the heating liquid-feeding temperature and the current liquid-feeding temperature.

According to the embodiment of the disclosure, the liquid refrigerant of the outdoor heat exchanger is heated according to the acquired 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.

Optionally, the temperature difference between the initial liquid inlet temperature and the heating liquid inlet temperature and the current liquid inlet temperature is used to obtain the heating parameters, including: and acquiring corresponding heating parameters from the second incidence relation according to a temperature interval in which the temperature difference between the temperature mean value and the current liquid inlet temperature is located.

In an embodiment, the temperature difference △ T is (T ═ T_{Initial feed of liquid}+T_{Heating liquid})/2-T1_{Feeding liquid}。

Where the second relationship includes or more different temperature ranges corresponding to heating parameters exemplary, alternative temperature ranges corresponding to heating parameters are shown in table 2, as shown in the following table,

TABLE 2

Temperature interval (Unit:. degree.C.)	Heating Rate (Unit:. degree. C/min)	Heating time (unit: min)
			a1＜△T≤a2	v11	t11
a2＜△T≤a3	v12	t12
			a3＜△T	v13	t13

In the corresponding relation, the heating rate and the temperature interval are positively correlated, and the heating duration and the temperature interval are positively correlated. That is, the larger the temperature interval in which the temperature reference value is located, the lower the current defrosting capacity of the bypass defrosting mode is, 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 soon as possible by heating, so that the defrosting capacity of the defrosting mode is enhanced.

Therefore, when the operation of heating the outlet refrigerant of the outdoor heat exchanger in step S103 is performed, the heating parameter may be determined according to the second association relationship, and then the heating may be performed according to the heating parameter.

In optional embodiments, the control method for defrosting of an air conditioner further includes obtaining a current outlet temperature of an outdoor heat exchanger of the air conditioner during heating of an outlet refrigerant of the outdoor heat exchanger, and controlling to stop heating if the current outlet temperature of the outdoor heat exchanger of the air conditioner is greater than or equal to an outlet temperature threshold.

In the embodiment of the disclosure, the outlet liquid temperature threshold is also a threshold which can be used for measuring and judging the defrosting capacity of the air conditioner; when the current outlet temperature of the outdoor heat exchanger is greater than or equal to the outlet temperature threshold, the defrosting effect on the outdoor heat exchanger is good, and the air conditioner is restored to the defrosting capacity capable of meeting the current defrosting requirement of the air conditioner; otherwise, it indicates that the defrosting of the outdoor heat exchanger is poor at present, and the current defrosting capacity of the air conditioner cannot meet the defrosting requirement.

Therefore, under the condition that the air conditioner recovers to the defrosting capacity capable of meeting the current defrosting requirement of the air conditioner, the heating is controlled to stop, and the power consumption for maintaining the operation of the heating device in the process of the bypass defrosting mode of the operation of the air conditioner can be effectively reduced.

Optionally, an temperature sensor is disposed on the refrigerant outlet pipe of the outdoor heat exchanger of the air conditioner in the heating mode, and the temperature sensor may be configured to detect a real-time temperature of the refrigerant flowing through the refrigerant outlet pipe, and therefore, in the embodiment of the present disclosure, the real-time temperature of the refrigerant detected by the temperature sensor is used as the current outlet temperature.

In this way, the heating can be stopped when the outlet temperature of the air conditioner outdoor heat exchanger is increased to fixed value, and compared with the mode of setting the outlet temperature threshold equal to the initial outlet temperature, the threshold setting mode can avoid the problem that the heating device is frequently started and stopped.

In alternative embodiments, the outlet liquid temperature threshold is obtained according to or several of the branch refrigerant parameter, the main refrigerant parameter and the heating parameter.

The branch refrigerant parameters comprise a branch refrigerant temperature, a branch refrigerant pressure and/or a branch refrigerant flow rate flowing through the defrosting bypass branch.

Optionally, the air conditioner is provided with a temperature sensor for detecting the temperature of the refrigerant flowing through the defrosting bypass branch on the defrosting bypass branch, and the temperature of the refrigerant detected by the temperature sensor is used as the branch refrigerant temperature, and is also optionally provided with a pressure sensor for detecting the pressure of the refrigerant flowing through the defrosting bypass branch on the defrosting bypass branch, and the pressure of the refrigerant detected by the pressure sensor is used as the branch refrigerant pressure, and is also optionally provided with a flow meter for detecting the flow rate of the refrigerant flowing through the defrosting bypass branch on the defrosting bypass branch, and the flow rate of the refrigerant detected by the flow meter is used as the branch refrigerant flow rate.

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 can affect the actual defrosting effect of the air conditioner due to the fact that 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 for detecting the temperature of the refrigerant flowing through the defrosting bypass branch on the refrigerant inlet pipe of the outdoor heat exchanger, and the temperature of the refrigerant detected by the temperature sensor is used as the temperature of the refrigerant in the main path, and is optional, the air conditioner is provided with a pressure sensor for detecting the pressure of the refrigerant flowing through the defrosting bypass branch on the refrigerant inlet pipe of the outdoor heat exchanger, and the pressure of the refrigerant detected by the pressure sensor is used as the pressure of the refrigerant in the main path, and is optional, the air conditioner is provided with a flow meter for detecting the flow rate of the refrigerant flowing through the defrosting bypass branch on the refrigerant inlet pipe of the outdoor heat exchanger, and the flow rate of the refrigerant detected by the flow meter is used as the flow rate of.

Optionally, the obtaining of the outlet temperature threshold according to or more of the branch refrigerant parameter, the main path refrigerant parameter and the heating parameter includes obtaining a corresponding outlet temperature threshold from the second association relationship according to a parameter combination, where the parameter combination includes or more of the branch refrigerant parameter, the main path refrigerant parameter and the heating parameter.

In the embodiment of the disclosure, the branch refrigerant parameter can reflect the state of the refrigerant used for defrosting in the bypass defrosting mode, the main refrigerant parameter can reflect the state of the refrigerant used for heating by the air conditioner, and the heating parameter can reflect the degree of improving the defrosting capacity of the air conditioner adopted by the current air conditioner, so that or more of the three factors are combined to determine the liquid temperature threshold value, and the accuracy of judging whether to stop heating is improved.

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 control devices for defrosting of an air conditioner, the structure of which is shown in fig. 2, including:

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.

Furthermore, the logic instructions in the memory 201 may be stored in computer readable storage media when implemented in software functional units and sold or used as independent products.

The processor 200 executes functional applications and data processing by executing the program instructions/modules stored in the memory 201, namely, implements the control method for defrosting the air conditioner in the above method embodiment.

The memory 201 may include a program storage area that may store an operating system, application programs necessary for at least functions, and a data storage area that may store data created according to the use of the terminal device, etc.

As shown in fig. 3, the disclosed embodiments further provide air conditioners, 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;

the defrosting bypass branch 21, end is connected with the exhaust port of the compressor 14, another end is connected with the refrigerant outlet pipe of the outdoor heat exchanger 11 under 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 inlet pipeline of the outdoor heat exchanger 11 in the heating mode and is configured to heat the refrigerant flowing through the refrigerant liquid inlet 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 control the air conditioner to enter the bypass defrosting mode after the air conditioner meets defrosting entering conditions, and heats the liquid inlet refrigerant of the outdoor heat exchanger according to the difference condition of respective liquid inlet temperatures before and after defrosting and during heating operation, so that the refrigerant flowing into the outdoor heat exchanger can be raised to a higher temperature, thereby realizing a better defrosting effect on the outdoor heat exchanger, effectively improving the temperature and flow of the gaseous refrigerant in the return air refrigerant of the compressor, and reducing the problem that the defrosting capacity of the air conditioner is reduced along with time due to the operation of the bypass defrosting mode.

The disclosed embodiments also provide computer-readable storage media storing computer-executable instructions configured to perform the above-described method for air conditioner defrosting.

The disclosed embodiments also provide computer program products 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 air conditioner defrosting.

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 embodiment of the present disclosure can be embodied in the form of a software product, where the computer software product is stored in storage media, and includes or more instructions to enable computer devices (which may be personal computers, servers, or network devices) to execute all or part of the steps of the method described in the embodiment of the present disclosure.

The above description and drawings illustrate embodiments of the disclosure sufficiently to enable those skilled in the art to practice them, other embodiments may include structural, logical, electrical, procedural and other changes, the embodiments represent only possible changes unless explicitly claimed, individual components and features are optional and the order of operation may vary, the scope of the embodiments of the disclosure includes the full scope of the claims and all available equivalents of the claims, when used in this application, although the terms "", "second" and the like may be used in this application to describe elements without limitation to these terms, these terms are used only to distinguish elements from elements, for example, the term 2 may be called a second element and, as such, the term " may be used only to distinguish between" elements "and" elements "if used without change in the meaning of the description," the term "is used in conjunction with" 4642 "or" may be used in "a" or "a" element "may be used in conjunction with" a "or" where "a" element is included in a "or included in the singular form of the embodiment" (or included in addition to the element, or included in a "component equivalent," and/or "may be included in a" disclosed "a" and/or "element).

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.

For example, the above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be only logical functional divisions, and in actual implementation, there may be other divisions, for example, multiple units or components may be combined or may be integrated into another systems, or features may be omitted or not executed.

The flowcharts and block diagrams in the figures may represent blocks, program segments, or portions of code which contain or more executable instructions for implementing specified logical functions, in some alternative implementations, the functions noted in the blocks may occur out of the order noted in the figures.

Claims

1, A control method for defrosting of air conditioner, which is characterized by comprising:

controlling the air conditioner to enter a bypass defrosting mode in response to the air conditioner satisfying a defrosting entry condition; 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;

under the condition that the current liquid inlet temperature, the initial liquid inlet temperature and the heating liquid inlet temperature meet the temperature condition of a refrigerant, controlling the liquid inlet refrigerant of the outdoor heat exchanger to be heated;

wherein, initial inlet liquid temperature is the inlet liquid temperature before the air conditioner gets into bypass defrosting mode, the heating inlet liquid temperature is the average value of the inlet liquid temperature when the air conditioner operation heating mode.

2. The control method according to claim 1, wherein the heating inlet temperature is an average value of a plurality of inlet temperatures obtained within a set time period after the air conditioner reaches a steady state when being started for heating.

3. The control method according to claim 1 or 2, wherein the defrosting parameter of the bypass defrosting mode is obtained according to the heating liquid inlet temperature.

4. The control method of claim 3, wherein the obtaining of the defrosting parameter of the bypass defrosting mode according to the heating liquid inlet temperature comprises:

acquiring corresponding defrosting parameters from the association relation according to the heating liquid inlet temperature;

the defrosting parameter includes a refrigerant flow rate of the defrosting bypass branch, and the heating liquid inlet temperature and the refrigerant flow rate of the defrosting branch in the -th association relationship are in positive correlation.

5. The control method according to claim 1, wherein the heating parameter for controlling heating of the feed refrigerant of the outdoor heat exchanger is obtained according to a temperature difference between a temperature average of the initial feed temperature and the heating feed temperature and the current feed temperature.

6. The control method according to claim 5, wherein the obtaining of the heating parameter from a temperature difference between an initial feed temperature and a temperature mean of the heating feed temperature, and the current feed temperature comprises:

acquiring corresponding heating parameters from a second incidence relation according to a temperature interval in which the temperature difference between the temperature mean value and the current liquid inlet temperature is located;

wherein the temperature interval is positively correlated with the heating parameter.

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

the method comprises the steps that in the process of heating a liquid outlet refrigerant of an outdoor heat exchanger, the current liquid outlet temperature of the outdoor heat exchanger of the air conditioner is obtained;

controlling to stop heating when the current liquid outlet temperature of the outdoor heat exchanger of the air conditioner is greater than or equal to the liquid outlet temperature threshold value;

the outlet temperature threshold is greater than an initial outlet temperature, and the initial outlet temperature is the outlet temperature of the air conditioner before the air conditioner enters the bypass defrosting mode.

8. The control method according to claim 7, wherein the outlet liquid temperature threshold is obtained according to or more of a branch refrigerant parameter, a main refrigerant parameter and the heating parameter;

the branch refrigerant parameters comprise a branch refrigerant temperature, a branch refrigerant pressure and/or a branch refrigerant flow rate flowing through the defrosting bypass branch;

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

A control device 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 as claimed in any of claims 1 to 8 and when executing the program instructions.

10, air conditioner, characterized by that, includes:

the defrosting bypass branch, wherein the end is communicated with the exhaust port of the compressor, and the end is communicated with the refrigerant outlet pipeline of the outdoor heat exchanger in the heating mode;

a control for defrosting an air conditioner as set forth in claim 9, electrically connected to said control valve and said heating means.