CN117267882A - Control method and device for defrosting of air conditioner, air conditioner and storage medium - Google Patents

Abstract

The application relates to the technical field of intelligent household appliances and discloses a control method for defrosting an air conditioner, wherein the air conditioner comprises a refrigeration cycle loop formed by a compressor, an indoor heat exchanger, an outdoor heat exchanger and a four-way valve; the outdoor heat exchanger comprises a plurality of outdoor heat exchangers which are connected in parallel; further comprises: the defrosting pipeline is connected with the exhaust port of the compressor and the outflow ends of the outdoor heat exchangers; the control method comprises the following steps: under the condition that the air conditioner operates in a heating mode, determining whether the outdoor heat exchanger meets frosting conditions; if the outdoor heat exchanger meets the frosting condition, acquiring outdoor environment parameters; determining the frosting degree of the outdoor heat exchanger according to the outdoor environment parameters; and controlling the defrosting pipeline of the target outdoor heat exchanger to be defrosted to be conducted according to the frosting degree, and executing a corresponding defrosting scheme. The method reduces the influence on indoor heating while realizing defrosting effect. The application also discloses a control device for defrosting the air conditioner and the air conditioner.

Description

Control method and device for defrosting of air conditioner, air conditioner and storage medium

Technical Field

The application relates to the technical field of intelligent household appliances, and for example relates to a control method and device for defrosting an air conditioner, the air conditioner and a storage medium.

Background

At present, the defrosting mode of the air conditioner mainly comprises two modes of shutdown defrosting and non-shutdown defrosting. The four-way valve is used for switching the flow direction of the refrigerant, and the high-temperature and high-pressure refrigerant output by the compressor is conveyed to the outdoor heat exchanger. And converting indoor heating into refrigeration so as to melt the frost layer of the outdoor unit. And (3) defrosting without stopping the machine, namely sensible heat defrosting, and conveying part of the high-temperature and high-pressure refrigerant output by the compressor to the heat exchanger of the outdoor unit so as to enable the temperature of the outdoor heat exchanger to rise and defrost. When the reverse circulation defrosting is performed, heat cannot be supplied to the room, and sensible heat defrosting consumes more refrigerant, so that the indoor heating effect is seriously affected.

In the related art, an air conditioner is disclosed, which includes a defrosting pipe that branches a part of refrigerant discharged from a compressor into an outdoor heat exchanger to be defrosted, and a pressure adjusting device that injects the refrigerant passing through the outdoor heat exchanger into the compressor. The pressure adjusting device adjusts the pressure of the refrigerant injected into the outdoor heat exchanger to be defrosted to an intermediate pressure, and adjusts the pressure of the refrigerant passing through the outdoor heat exchanger and then injects the refrigerant into the compressor.

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:

only an air conditioner using latent heat for defrosting is disclosed, and the air conditioner is more prone to frosting in a high humidity environment. In this case, how to implement the defrosting control is not disclosed in the related art.

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, and is intended to neither identify key/critical elements nor delineate the scope of such embodiments, but is intended as a prelude to the more detailed description that follows.

The embodiment of the disclosure provides a control method and device for defrosting an air conditioner in a high-humidity environment, the air conditioner and a storage medium, so as to realize defrosting control in the high-humidity environment.

In some embodiments, an air conditioner includes a refrigeration cycle circuit including a compressor, an indoor heat exchanger, an outdoor heat exchanger, and a four-way valve, wherein the outdoor heat exchanger includes a plurality of outdoor heat exchangers connected in parallel; further comprises: one end of the defrosting pipeline is connected with the exhaust port of the compressor, and the other end of the defrosting pipeline is connected with the outflow ends of the outdoor heat exchangers; the control method comprises the following steps: under the condition that the air conditioner operates in a heating mode, determining whether the outdoor heat exchanger meets frosting conditions; acquiring outdoor environment parameters under the condition that the outdoor heat exchanger meets frosting conditions; under the condition that the outdoor environment parameter indicates that the current outdoor environment is a high-humidity environment, determining the frosting degree of the target outdoor heat exchanger to be defrosted according to the outdoor environment parameter; and controlling the conduction of the defrosting pipeline of the target outdoor heat exchanger according to the frosting degree, and executing a corresponding defrosting scheme.

In some embodiments, the apparatus comprises: a processor and a memory storing program instructions, the processor being configured to execute the control method for defrosting an air conditioner in a high humidity environment as described above when the program instructions are executed.

In some embodiments, the air conditioner includes: the control device for defrosting the air conditioner in a high humidity environment as described above.

In some embodiments, the storage medium stores program instructions that, when executed, perform a control method for defrosting an air conditioner in a high humidity environment as described previously.

The control method and device for defrosting of the air conditioner in the high-humidity environment, the air conditioner and the storage medium provided by the embodiment of the disclosure can realize the following technical effects:

and under the condition that the air conditioner meets the frosting condition and the outdoor environment where the air conditioner is positioned is a high-humidity environment, determining the frosting degree of the target outdoor heat exchanger to be defrosted through the outdoor environment parameters. And further, according to the frosting degree, determining a corresponding defrosting scheme and controlling the air conditioner to execute. In this way, the frosting degree of the outdoor heat exchanger is judged by combining the environmental parameters under the high humidity environment. And corresponding defrosting schemes are adopted aiming at different frosting degrees. Therefore, based on the frosting characteristic of the high-humidity environment, a proper defrosting scheme is determined, the defrosting effect is achieved, and meanwhile the influence on indoor heating is reduced.

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 and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which like reference numerals refer to similar elements, and in which:

fig. 1 is a schematic structural view of an air conditioner provided in an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of a control method for defrosting an air conditioner provided in an embodiment of the present disclosure;

FIG. 3 is a schematic diagram of control of air conditioner defrost in a method provided by an embodiment of the present disclosure;

fig. 4 is a schematic diagram of another control method for defrosting an air conditioner provided in an embodiment of the present disclosure;

fig. 5 is a schematic flow diagram of a refrigerant when the air conditioner according to the embodiment of the present disclosure is operated in a heating mode;

FIG. 6 is a schematic illustration of one application of an embodiment of the present disclosure;

fig. 7 is a schematic flow diagram of a refrigerant when the first outdoor heat exchanger is defrosted according to an embodiment of the present disclosure;

fig. 8 is a schematic flow diagram of a refrigerant when the second outdoor heat exchanger provided in the embodiment of the present disclosure is defrosted;

fig. 9 is a schematic diagram of a control device for defrosting an air conditioner according to an embodiment of the present disclosure.

Reference numerals:

10. a compressor; 20. a four-way valve; 30. an indoor heat exchanger; 40. an outdoor heat exchanger; 50. defrosting throttle device; 60. a pressure regulating device; 70. a pipeline switching device; 80. an indoor throttling device; 90. a defrost line; 31. a first indoor heat exchanger; 32. a second indoor heat exchanger; 41. a first outdoor heat exchanger; 42. a second outdoor heat exchanger; 61. a first pressure regulating valve; 62. a second pressure regulating valve; 71. a first outdoor on-off valve; 72. a first defrost on-off valve; 73. a second outdoor on-off valve; 74. a second defrost on-off valve; 81. a first indoor throttle valve; 82. a second indoor throttle valve; 91. a defrosting main path; 92. a first defrost branch; 93. and a second defrosting branch.

Detailed Description

So that the manner in which the features and techniques of the disclosed embodiments can be understood in more detail, a more particular description of the embodiments of the disclosure, briefly summarized below, may be had by reference to the appended drawings, which are not intended to be limiting of the embodiments of the disclosure. 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 still be practiced without these details. In other instances, well-known structures and devices may be shown simplified in order to simplify the drawing.

The terms first, second and the like in the description and in the claims of the embodiments of the disclosure and in the above-described figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe embodiments of the present disclosure. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.

The term "plurality" means two or more, unless otherwise indicated.

In the embodiment of the present disclosure, the character "/" indicates that the front and rear objects are an or relationship. For example, A/B represents: a or B.

The term "and/or" is an associative relationship that describes an object, meaning that there may be three relationships. For example, a and/or B, represent: a or B, or, A and B.

The term "corresponding" may refer to an association or binding relationship, and the correspondence between a and B refers to an association or binding relationship between a and B.

The air conditioner includes a refrigeration cycle. The refrigeration cycle loop comprises a compressor, an indoor heat exchanger, an outdoor heat exchanger and a four-way valve; wherein the outdoor heat exchanger comprises a plurality of outdoor heat exchangers connected in parallel. Further comprises: defrost pipeline, defrost throttling device, pressure regulator and pipeline switching device. One end of the defrosting pipeline is connected with the exhaust port of the compressor, and the other end is connected with the outflow end of each outdoor heat exchanger. The defrosting throttle device is arranged on the defrosting pipeline and is used for converting high-pressure high-temperature refrigerant discharged by the compressor into medium-pressure high-temperature refrigerant to be injected into the outdoor heat exchanger to be defrosted. And the pressure regulating device is arranged at the inflow end of each outdoor heat exchanger. The pipeline switching device is arranged at the outflow end of the outdoor heat exchanger and on the defrosting pipeline and is used for controlling the connection or disconnection of the defrosting pipeline or the refrigeration cycle pipeline of the outdoor heat exchanger to be defrosted.

The inflow end of the outdoor heat exchanger herein refers to an end into which the refrigerant flows from the outdoor heat exchanger when the air conditioner is operating in the heating mode; the outflow end refers to the end from which the refrigerant flows out of the outdoor heat exchanger when the air conditioner is operated in a heating mode.

Optionally, the defrost line comprises: a defrosting main path and a plurality of defrosting branches. And each defrosting branch is connected with the exhaust port of the compressor through the defrosting main path. The number of defrosting branches is the same as the number of outdoor heat exchangers. The outflow ends of the outdoor heat exchangers are in one-to-one correspondence with the defrosting branches, and the outdoor heat exchangers are connected with the defrosting main path through the corresponding defrosting branches.

Similarly, the pipeline switching device comprises an outdoor on-off valve arranged at the outflow end of each outdoor heat exchanger and a defrosting on-off valve arranged on the defrosting branch. The number of the outdoor on-off valves is the same as that of the outdoor heat exchangers, and the number of the defrosting on-off valves is the same as that of the defrosting branches. When all the outdoor heat exchangers are in a heating mode, the outdoor on-off valves are in a conducting state, and the refrigeration cycle loops of all the outdoor heat exchangers are conducted. Meanwhile, the defrosting on-off valves are in a closed state, namely, high-pressure and high-temperature refrigerant discharged by the compressor cannot be injected into each outdoor heat exchanger through the defrosting pipeline. It will be appreciated that when one or more of the outdoor heat exchangers need to be defrosted, the corresponding outdoor on-off valve of that outdoor heat exchanger is closed and the defrost on-off valve is opened. Thus, when other outdoor heat exchangers operate in a heating mode, independent defrosting control can be performed on one or some outdoor heat exchangers.

Optionally, the indoor heat exchanger is one or more. The outflow end of each indoor heat exchanger is provided with an indoor throttling device.

As shown in fig. 1, two outdoor heat exchangers are taken, and two indoor heat exchangers are taken as examples:

the refrigeration cycle is composed of a compressor 10, a four-way valve 20, an outdoor heat exchanger 40, and an indoor heat exchanger 30. Wherein the outdoor heat exchanger 40 includes a first outdoor heat exchanger 41 and a second outdoor heat exchanger 42 connected in parallel. The indoor heat exchanger 30 includes a first indoor heat exchanger 31 and a second indoor heat exchanger 32 connected in parallel.

The first outdoor heat exchanger 41 is provided at an inflow end thereof with a first pressure regulating valve 61 and at an outflow end thereof with a first outdoor on-off valve 71. The first pressure regulating valve 61 and the first outdoor on-off valve 71 are both provided on the refrigeration cycle. The first outdoor heat exchanger 41 corresponds to the first defrost branch 92. One end of the first defrost branch 92 is connected between the first outdoor on-off valve 71 and the outflow end of the first outdoor heat exchanger 41, and the other end is connected to the defrost choke 50. The first defrost branch 92 is provided with a first defrost on-off valve 72.

Similarly, the second outdoor heat exchanger 42 is provided with a second pressure regulating valve 62 at the inflow end and a second outdoor on-off valve 73 at the outflow end. The second pressure regulating valve 62 and the second outdoor on-off valve 73 are both provided on the refrigeration cycle. The second outdoor heat exchanger 42 corresponds to the second defrosting branch 93. One end of the second defrost branch 93 is connected between the second outdoor on-off valve 73 and the outflow end of the second outdoor heat exchanger 42, and the other end is connected with the defrost choke 50. The second defrost branch 93 is provided with a second defrost on-off valve 74. The defrost throttle device 50 is provided on the defrost main path 91.

Further, the outflow end of the first indoor heat exchanger 31 is provided with a first indoor throttle valve 81. The outflow end of the second indoor heat exchanger 32 is provided with a second indoor throttle valve 82.

As shown in connection with fig. 2, an embodiment of the present disclosure provides a method for defrosting an air conditioner in a high humidity environment, including:

s201, in case of the air conditioner operation heating mode, the processor determines whether the outdoor heat exchanger satisfies a frosting condition.

S202, when the outdoor heat exchanger meets frosting conditions, the processor acquires outdoor environment parameters.

And S203, determining the frosting degree of the outdoor heat exchanger by the processor according to the outdoor environment parameter under the condition that the outdoor environment parameter indicates that the current outdoor environment is a high-humidity environment.

And S204, the processor controls the defrosting pipeline of the target outdoor heat exchanger to be defrosted to be conducted according to the frosting degree, and executes a corresponding defrosting scheme.

Here, when the air conditioner operates in the heating mode, whether the outdoor heat exchanger satisfies the frosting condition may be determined by detecting an outdoor environmental parameter or an operation parameter of the air conditioner. Wherein the outdoor environment parameters include outdoor environment temperature, outdoor environment humidity, etc. The operating parameters of the air conditioner include the outdoor heat exchanger coil temperature, the current of the outdoor unit, the operating frequency of the compressor, etc. Then, if the outdoor heat exchanger satisfies the frosting condition, it is further determined whether the outdoor environment is a high humidity environment. If the outdoor environment is a high humidity environment, the frosting degree of the outdoor heat exchanger needs to be further determined. The degree of frosting can be used to characterize the thickness of the frosting. When the outdoor environment humidity is high, the frosting degree of the air conditioner is increased. Therefore, it is first determined whether or not the outdoor environment is a high humidity environment. And setting a humidity threshold, and if the outdoor environment humidity is greater than the humidity threshold, indicating that the current environment is a high-humidity environment. Here, the humidity threshold value ranges from 60% to 70%. When the humidity sensor is installed on the air conditioner outdoor unit, the outdoor environment humidity can be directly obtained through the humidity sensor. It is then determined whether the outdoor ambient humidity is greater than a humidity threshold.

In order to ensure the defrosting effect, different defrosting schemes are adopted for different frosting degrees. The difference in defrosting schemes mainly means that the refrigerants required for defrosting are different, so that the control parameters are different. Generally, the greater the degree of frosting, the more defrost refrigerant is required. In this way, on the one hand, the effectiveness of defrosting can be achieved based on the characteristics of frosting in a high humidity environment. On the other hand, the quantity of defrosting refrigerant corresponding to the frosting degree can be matched, and the waste of the refrigerant is avoided, so that the indoor heating requirement is ensured.

The outdoor heat exchanger includes a plurality of heat exchangers, and thus defrosting is performed one by one when a defrosting scheme is performed. Namely, the target outdoor heat exchanger is controlled to defrost, and other outdoor heat exchangers heat. And after the target outdoor heat exchanger finishes defrosting, defrosting the next target outdoor heat exchanger. The cycle is then completed until all outdoor heat exchangers are defrosted. When the target outdoor heat exchanger is defrosted, the defrosting pipeline corresponding to the target outdoor heat exchanger is controlled to be conducted so as to inject high-temperature refrigerant for defrosting. At this time, the refrigerant flowing out from the discharge port of the compressor is split into two paths. One path enters the indoor heat exchanger through the four-way valve for air conditioning heat, and the other path enters the target outdoor heat exchanger through the defrosting pipeline for defrosting. The refrigerant after heat exchange in the target outdoor heat exchanger flows out from the inflow end of the target outdoor heat exchanger, merges with the refrigerant in the refrigeration cycle loop, and flows into other outdoor heat exchangers.

In addition, the degree of frosting of all the outdoor heat exchangers may or may not be the same. Depending on the design of the refrigerant circuit of the air conditioner outdoor unit. If the refrigerant distribution is uniform, the frosting degree of the outdoor heat exchanger is substantially the same. In this case, the defrosting schemes of all the outdoor heat exchangers are the same. If the refrigerant is unevenly distributed, the outdoor heat exchangers are different in frosting degree. At this time, the defrosting schemes of the outdoor heat exchangers are different.

By adopting the method for defrosting the air conditioner in the high-humidity environment, provided by the embodiment of the disclosure, when the air conditioner meets the frosting condition and the outdoor environment where the air conditioner is positioned is the high-humidity environment, the frosting degree of the target outdoor heat exchanger to be defrosted is determined through the outdoor environment parameters. And further, according to the frosting degree, determining a corresponding defrosting scheme and controlling the air conditioner to execute. In this way, the frosting degree of the outdoor heat exchanger is judged by combining the environmental parameters under the high humidity environment. And corresponding defrosting schemes are adopted aiming at different frosting degrees. Therefore, based on the frosting characteristic of the high-humidity environment, a proper defrosting scheme is determined, the defrosting effect is achieved, and meanwhile the influence on indoor heating is reduced.

Optionally, in step S203, the processor determines, according to the outdoor environment parameter, a frosting degree of the target outdoor heat exchanger to be defrosted, including:

the processor determines that the target outdoor heat exchanger has a first level of frost if the outdoor ambient temperature is greater than a first temperature threshold.

If the outdoor ambient temperature is less than or equal to the first temperature threshold, the processor determines that the degree of frosting of the target outdoor heat exchanger is a second level; wherein the first level of frost is less than the second level of frost.

In an embodiment of the present disclosure, the outdoor environment parameter includes an outdoor environment temperature. An outdoor ambient temperature is obtained. And determining the frosting degree according to the outdoor environment temperature. Specifically, a first temperature threshold is set, wherein the value range is about 0 ℃. The degree of frosting is divided into two stages by a first temperature threshold. When the ambient temperature is greater than the first temperature threshold, the degree of frosting is light, i.e., a first grade. And when the ambient temperature is less than or equal to the first temperature threshold, the frosting degree is heavy, namely the second grade. In addition, a plurality of thresholds may be set to subdivide the frost level, not limited to two levels.

Optionally, in step S203, the processor determines that the current outdoor environment is a high humidity environment by:

the processor obtains a decay acceleration of the coil temperature of the outdoor heat exchanger.

And under the condition that the damping acceleration is larger than the preset acceleration, determining that the outdoor environment is a high-humidity environment.

In the embodiment of the disclosure, the installation of the humidity sensor in the outdoor unit is considered to cause the cost increase of the air conditioner. The outdoor units of the existing air conditioner are all provided with temperature sensors, and the outdoor environment humidity condition is determined through the temperature change of the outdoor heat exchanger coil. Specifically, the coil temperature of the outdoor heat exchanger is periodically detected, and the damping acceleration of the coil temperature within a preset time period is calculated. If the decay acceleration exceeds the preset value, the current outdoor environment humidity is indicated to be high. If the decay acceleration is less than or equal to the preset value, the current outdoor environment humidity is indicated to be general. For example, the coil temperature of the outdoor heat exchanger is detected every 10 seconds, and the decay acceleration rate a= (t 1-t 2)/2 of the coil temperature in 2 minutes is calculated. Wherein t1 is a first temperature detection value within a preset time period, and t2 is a last temperature detection value within the preset time period. The decay acceleration preset value may be 2 deg.c/min. That is, if the decay acceleration is greater than 2 ℃/min, it indicates that the outdoor ambient humidity is high. Here, high humidity means that the relative humidity value is 60% or more.

Optionally, in step S204, the processor controls the target outdoor heat exchanger to be defrosted to execute a corresponding defrosting scheme according to the frosting degree, including:

s241, the processor determines the target pressure of the target outdoor heat exchanger according to the first corresponding relation between the frosting degree and the defrosting pressure.

S242, the processor confirms and adjusts the operation parameters of the defrosting throttling device and the pressure adjusting device according to the target pressure.

Here, the required defrost pressure is different for different degrees of frosting. The defrosting pressure refers to the pressure of the defrosting refrigerant in the target outdoor heat exchanger. As one example, when the degree of frosting is a first level, the defrosting pressure is a first target pressure. And when the frosting degree is the second grade, the defrosting pressure is the second target pressure. Wherein the first target pressure is less than the second target pressure. In short, the greater the degree of frosting, the greater the defrost pressure. Further, the pressure of the target outdoor heat exchanger depends on the inflow and outflow of the defrost refrigerant. Thus, the pressure regulating device of the target outdoor heat exchanger and the defrost throttle device on the defrost line are regulated to reach the target pressure of the target outdoor heat exchanger.

When the defrosting mode is performed by controlling the target outdoor heat exchanger, it is generally necessary to turn off the refrigeration cycle of the target outdoor heat exchanger in synchronization with the on of the defrosting line. As shown in fig. 1, the first outdoor heat exchanger is taken as an example of the target outdoor heat exchanger. The defrosting pipeline is conducted, namely the first defrosting on-off valve is opened, and the refrigeration cycle loop is closed, namely the first outdoor on-off valve is closed.

In some embodiments, to extend the heating time of the target outdoor heat exchanger, the defrost time is shortened. The pre-defrost is performed before the control pressure adjusting means and the defrost throttling means perform the target value. That is, after the defrosting line is turned on, the refrigeration cycle circuit of the target outdoor heat exchanger is also in an on state. In this way, the evaporation temperature of the target outdoor heat exchanger is greatly increased by the inflow of a part of the defrosting refrigerant. The heat exchange with the frost layer of the target outdoor heat exchanger is facilitated, and the temperature of the frost layer is improved. And at the same time of heating, the temperature of the target outdoor heat exchanger is increased, so that the pre-defrosting is realized.

Further, in the pre-defrosting process, the opening degree of the pressure regulating device of the target outdoor heat exchanger is the maximum opening degree, and the opening degree of the defrosting throttle device is a preset proportion of the maximum opening degree. Wherein the value range of the preset proportion is 30% -45%. In this way, the evaporation temperature of the target outdoor heat exchanger in the heating mode can be maximized. Meanwhile, a part of defrosting refrigerant is converged with the refrigerant flowing through the outdoor heat exchanger of the heating mode and flows into the compressor. In this way, the discharge temperature of the compressor is increased, contributing to defrosting. And after the preset time length, controlling the refrigeration cycle loop of the target outdoor heat exchanger to be closed, and entering a formal defrosting mode.

Optionally, in step S242, the processor adjusts an operating parameter of the defrost throttle device and the pressure adjustment device according to the target pressure, including:

and determining a first target opening degree of the defrosting throttling device according to a second corresponding relation between the target pressure and the opening degree of the defrosting throttling device.

Adjusting the opening of the defrosting throttling device to a first target opening; and adjusting the opening degree of the pressure adjusting device according to the current pressure and the target pressure of the target outdoor heat exchanger.

Here, the target pressure of the defrost refrigerant has a correspondence with the flow rate, and the target flow rate can be determined. And determining the first target opening based on the corresponding relation between the flow rate and the opening. At this time, the corresponding defrosting branch of the target outdoor heat exchanger is turned on, and the refrigeration cycle is turned off. Namely, the corresponding defrosting throttling device is opened, and the outdoor on-off valve is closed. The defrosting refrigerant flow in the target outdoor heat exchanger is adjusted to the target flow first, and then the defrosting refrigerant pressure in the target outdoor heat exchanger is adjusted to the target pressure. Specifically, the opening degree of the defrost throttle device is adjusted to the target opening degree after the opening degree of the pressure adjusting device is adjusted to the minimum opening degree. In this way, the outflow amount of the defrosting refrigerant from the target outdoor heat exchanger can be reduced, and the pressure inside the target outdoor heat exchanger can be increased while the flow rate of the target outdoor heat exchanger is regulated.

Optionally, in step S201, the processor determines whether the outdoor heat exchanger meets a frosting condition, including:

the processor obtains the coil temperature of the outdoor heat exchanger.

The processor determines that the outdoor heat exchanger satisfies a frosting condition if the coil temperature is less than or equal to a second temperature threshold.

Here, by detecting the coil temperature of the outdoor heat exchanger, it is determined whether the outdoor heat exchanger is frosted. The temperature sensor is arranged in the middle of the outdoor heat exchanger coil, and the temperature of each outdoor heat exchanger coil is obtained through the temperature sensor. A second temperature threshold, such as a value of-3 c, is set. If the coil temperature is less than or equal to the second temperature threshold, it is indicative that the outdoor heat exchanger satisfies the frosting condition.

As shown in conjunction with fig. 4, an embodiment of the present disclosure provides a method for defrosting an air conditioner, including:

s401, in case of the air conditioner operating heating mode, the processor determines whether the outdoor heat exchanger satisfies a frosting condition.

S402, in the case that the outdoor heat exchanger meets the frosting condition, the processor acquires outdoor environment parameters.

S403, when the outdoor environment parameter indicates that the current outdoor environment is a high-humidity environment, the processor determines the frosting degree of the outdoor heat exchanger according to the outdoor environment parameter.

And S404, the processor controls the defrosting pipeline of the target outdoor heat exchanger to be defrosted to be conducted according to the frosting degree, and executes a corresponding defrosting scheme.

And S405, the processor controls the rotating speed of the outdoor fan according to the frosting degree.

In the embodiment of the disclosure, in the defrosting process, the rotating speed of the outdoor fan is controlled according to the frosting degree of the outdoor heat exchanger. In general, a part of the refrigerant flowing out from the discharge port of the compressor is branched during defrosting, and is used for defrosting. This affects the amount of refrigerant for indoor heating, so that the indoor heating amount is reduced. In order to reduce the influence on indoor heating capacity during defrosting, the rotating speed of the outdoor fan is reduced during defrosting, such as running at the lowest gear wind speed. Similarly, the rotation speed of the indoor fan is also appropriately reduced.

Optionally, in step S405, the processor controls the rotation speed of the outdoor fan according to the frosting degree, including:

under the condition that the frosting degree is the first level, the processor controls the outdoor fan to keep the current rotating speed; and under the condition that the frosting degree is the second grade, the processor controls the outdoor fan to operate at the lowest gear rotating speed.

Here, different outdoor fan speeds are determined for different degrees of frosting. When the frosting degree is light, the rotating speed of the outdoor fan is kept unchanged. When the frosting degree is heavy, the outdoor fan operates at the lowest gear rotating speed. Thus, the influence on the indoor heating amount can be reduced during defrosting.

The following will specifically describe this embodiment by taking two outdoor heat exchangers and two indoor heat exchangers as examples.

Referring to fig. 1, when the air conditioner is operating in the heating mode, the defrost throttle device 50, the first defrost on-off valve 72 and the second defrost on-off valve 74 on the defrost line 90 are all closed. The first outdoor on-off valve 71 and the second outdoor on-off valve 73 are both opened, and the first pressure regulating valve 61 and the second pressure regulating valve 62 are opened to the opening degree required for heating. The first indoor throttle valve 81 and the second indoor throttle valve 82 are also both opened to the normal opening degrees.

As shown in fig. 5, in the heating mode, the refrigerant flows as follows. The refrigerant enters the four-way valve 20 through the discharge port of the compressor 13, and then flows into the first indoor heat exchanger 31 and the second indoor heat exchanger 32. The refrigerant flows out of the first indoor heat exchanger 31 and the second indoor heat exchanger 32, flows into the first outdoor heat exchanger 41 and the second outdoor heat exchanger 42 through the indoor throttle device 80 and the pressure regulating device 60. The refrigerant flowing out of the first outdoor heat exchanger 41 and the second outdoor heat exchanger 42 passes through the first outdoor on-off valve 71 and the second outdoor on-off valve 73, respectively, and then returns to the intake port of the compressor 10 through the four-way valve 14.

Referring to fig. 6, the implementation procedure of this embodiment is as follows:

s601, an air conditioner operates a heating mode;

s602, obtaining the coil temperature Tp of the outdoor heat exchanger;

s603, judging whether Tp is less than or equal to T2, if so, executing S604; if not, then S602 is performed;

s604, acquiring outdoor environment humidity Hao;

s605, judging whether Hao > H1, if so, executing S606; if not, then S604 is performed;

s606, acquiring an outdoor environment temperature Tao;

s607, judging whether Tao is larger than T1, if so, executing S608; if not, then S617 is performed;

s608, determining the frosting degree of the outdoor heat exchanger as a first grade;

s609, determining that the first outdoor heat exchanger 41 is a target outdoor heat exchanger to be defrosted, and determining that its target pressure is a first target pressure; closing the first outdoor on-off valve 71; the opening degrees of the first pressure regulating valve 61 and the defrost throttle device 50 are adjusted so that the pressure of the first outdoor heat exchanger 41 reaches the first target pressure; ( At this time, as shown in fig. 7, the flow of the refrigerant is divided into two paths by the refrigerant flowing out from the discharge port of the compressor 10. One path enters the indoor heat exchanger 30 through the four-way valve 20 for air conditioning heat; the other path enters the first outdoor heat exchanger 41 through the first defrost branch 92 to defrost. The refrigerant flowing out of the first outdoor heat exchanger 41 merges with the refrigerant in the refrigeration cycle, flows into the second outdoor heat exchanger 42, and is circulated back to the compressor 40. )

S610, acquiring the temperature T1 of the first outdoor heat exchanger 41;

s611, judging whether T1 is more than Tn; if yes, then execution S812; if not, then S810 is performed; here, tn is a preset threshold;

s612, controlling the first outdoor on-off valve 71 to be opened and the first defrost on-off valve 72 to be closed;

s613, determining that the second outdoor heat exchanger 42 is the target outdoor heat exchanger, and determining that the target pressure thereof is the first target pressure; closing the second outdoor on-off valve 73; the opening degrees of the second pressure regulating valve 62 and the defrost throttle device 50 are adjusted so that the pressure of the second outdoor heat exchanger 42 reaches the first target pressure; ( At this time, as shown in fig. 8, the flow of the refrigerant is divided into two paths by the refrigerant flowing out from the discharge port of the compressor 10. One path enters the indoor heat exchanger 30 through the four-way valve 20 for air conditioning heat; the other path enters the second outdoor heat exchanger 42 through the second defrosting branch 93 to defrost. The refrigerant flowing out of the second outdoor heat exchanger 42 merges with the refrigerant in the refrigeration cycle, flows into the first outdoor heat exchanger 41, and is circulated back to the compressor 40. )

S614, acquiring the temperature T2 of the second outdoor heat exchanger 42;

s615, judging whether T2 is more than Tn; if yes, then execution S616; if not, then S614 is performed;

s616, the flow ends.

S617, determining the frosting degree of the outdoor heat exchanger as a second grade;

s618, determining that the first outdoor heat exchanger 41 is a target outdoor heat exchanger to be defrosted, and determining that the target pressure is a second target pressure; closing the first outdoor on-off valve 71; the opening degrees of the first pressure regulating valve 61 and the defrost throttle device 50 are adjusted so that the pressure of the first outdoor heat exchanger 41 reaches the first target pressure;

s619, acquiring the temperature T1 of the first outdoor heat exchanger 41;

s620, judging whether T1 is more than Tn; if yes, then execution S621; if not, executing S619;

s621, the first outdoor on-off valve 71 is controlled to be opened, and the first defrost on-off valve 72 is controlled to be closed;

s622, determining that the second outdoor heat exchanger 42 is a target outdoor heat exchanger, and determining that the target pressure is a second target pressure; closing the second outdoor on-off valve 73; the opening degrees of the second pressure regulating valve 62 and the defrost throttle device 50 are adjusted so that the pressure of the second outdoor heat exchanger 42 reaches the second target pressure;

s623, acquiring the temperature T2 of the second outdoor heat exchanger 42;

s624, judging whether T2 is more than Tn; if yes, then execution S625; if not, S623 is performed;

s625, ending the flow.

The embodiment of the disclosure provides a control device for defrosting an air conditioner, which comprises a first determining module, an acquiring module, a second determining module and a control module. The first determining module is configured to determine whether the outdoor heat exchanger meets a frosting condition in the case of an air conditioner operating heating mode; the acquisition module is configured to acquire an outdoor environmental parameter if the outdoor heat exchanger satisfies a frosting condition; the second determining module is configured to determine a frosting degree of the outdoor heat exchanger according to the outdoor environment parameter under the condition that the outdoor environment parameter indicates that the current outdoor environment is a high-humidity environment; the control module is configured to control the defrosting line of the target outdoor heat exchanger to be defrosted to be conducted according to the degree of frosting, and execute a corresponding defrosting scheme.

By adopting the control device for defrosting the air conditioner under the high-humidity environment, provided by the embodiment of the disclosure, when the air conditioner meets the frosting condition and the outdoor environment where the air conditioner is positioned is the high-humidity environment, the frosting degree of the target outdoor heat exchanger to be defrosted is determined through the outdoor environment parameters. And further, according to the frosting degree, determining a corresponding defrosting scheme and controlling the air conditioner to execute. In this way, the frosting degree of the outdoor heat exchanger is judged by combining the environmental parameters under the high humidity environment. And corresponding defrosting schemes are adopted aiming at different frosting degrees. Therefore, based on the frosting characteristic of the high-humidity environment, a proper defrosting scheme is determined, the defrosting effect is achieved, and meanwhile the influence on indoor heating is reduced.

As shown in connection with fig. 9, an embodiment of the present disclosure provides a control apparatus for defrosting an air conditioner, including a processor (processor) 100 and a memory (memory) 101. Optionally, the apparatus may further comprise a communication interface (Communication Interface) 102 and a bus 103. The processor 100, the communication interface 102, and the memory 101 may communicate with each other via the bus 103. The communication interface 102 may be used for information transfer. The processor 100 may call logic instructions in the memory 101 to perform the control method for air conditioning defrost of the above-described embodiment.

Further, the logic instructions in the memory 101 described above may be implemented in the form of software functional units and may be stored in a computer readable storage medium when sold or used as a stand alone product.

The memory 101 is a computer readable storage medium that can be used to store a software program, a computer executable program, such as program instructions/modules corresponding to the methods in the embodiments of the present disclosure. The processor 100 executes functional applications and data processing by executing program instructions/modules stored in the memory 101, i.e., implements the control method for defrosting an air conditioner in a high humidity environment in the above-described embodiment.

The memory 101 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, at least one application program required for a function; the storage data area may store data created according to the use of the terminal device, etc. Further, the memory 101 may include a high-speed random access memory, and may also include a nonvolatile memory.

The embodiment of the disclosure provides an air conditioner, which comprises the control device for defrosting the air conditioner.

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

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

Embodiments of the present disclosure may be embodied in a software product stored on a storage medium, including one or more instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of a method according to embodiments of the present disclosure. And the aforementioned storage medium may be a non-transitory storage medium including: a plurality of media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or a transitory storage medium.

The above description and the drawings illustrate embodiments of the disclosure sufficiently to enable those skilled in the art to practice them. Other embodiments may involve structural, logical, electrical, process, and other changes. The embodiments represent only 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. Moreover, the terminology used in the present application is for the purpose of describing embodiments only and is not intended to limit the claims. As used in the description of the embodiments and the claims, the singular forms "a," "an," and "the" (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, when used in this application, the terms "comprises," "comprising," and/or "includes," and variations thereof, mean that the stated features, integers, steps, operations, elements, and/or components are present, but that the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof is not precluded. Without further limitation, an element defined by the phrase "comprising one …" does not exclude the presence of other like elements in a process, method or apparatus comprising such elements. In this context, each embodiment may be described with emphasis on the differences from the other embodiments, and the same similar parts between the various embodiments may be referred to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method sections disclosed in the embodiments, the description of the method sections may be referred to for relevance.

Those of skill in the art will 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 depends upon the particular application and design constraints imposed on the solution. The skilled artisan may use different methods for each particular application to achieve the described functionality, but such implementation should not be considered to be beyond the scope of the embodiments of the present disclosure. It will be clearly understood by those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.

In the embodiments disclosed herein, the disclosed methods, articles of manufacture (including but not limited to devices, apparatuses, etc.) may be practiced in other ways. For example, the apparatus embodiments described above are merely illustrative, and for example, the division of the units may be merely a logical function division, and there may be additional divisions when actually implemented, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. In addition, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form. The units described as separate units may or may not be physically separate, and units shown 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 may be selected according to actual needs to implement the present embodiment. In addition, each functional unit in the embodiments of the present disclosure may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.

The flowcharts 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 that disclosed in the description, and sometimes no specific order exists between different operations or steps. For example, two consecutive operations or steps may actually be performed substantially in parallel, they may sometimes be performed in reverse order, which may be dependent on the functions involved. Each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

Claims (10)

1. The control method for defrosting the air conditioner is characterized in that the air conditioner comprises a refrigeration cycle loop, wherein the refrigeration cycle loop comprises a compressor, an indoor heat exchanger, an outdoor heat exchanger and a four-way valve, and the outdoor heat exchanger comprises a plurality of outdoor heat exchangers which are connected in parallel; further comprises:

one end of the defrosting pipeline is connected with the exhaust port of the compressor, and the other end of the defrosting pipeline is connected with the outflow ends of the outdoor heat exchangers;

the control method comprises the following steps:

under the condition that the air conditioner operates in a heating mode, determining whether the outdoor heat exchanger meets frosting conditions;

acquiring outdoor environment parameters under the condition that the outdoor heat exchanger meets frosting conditions;

under the condition that the outdoor environment parameter indicates that the current outdoor environment is a high-humidity environment, determining the frosting degree of the target outdoor heat exchanger according to the outdoor environment parameter;

and controlling the defrosting pipeline of the target outdoor heat exchanger to be defrosted to be conducted according to the frosting degree, and executing a corresponding defrosting scheme.

2. The method of claim 1, wherein the outdoor environmental parameter comprises an outdoor environmental temperature; the determining the frosting degree of the target outdoor heat exchanger to be defrosted according to the outdoor environment parameters comprises the following steps:

determining that the frosting degree of the target outdoor heat exchanger is a first grade under the condition that the outdoor environment temperature is greater than a first temperature threshold value;

determining that the frosting degree of the target outdoor heat exchanger is a second grade under the condition that the outdoor environment temperature is less than or equal to a first temperature threshold value;

wherein the first level of frost is less than the second level of frost.

3. The method of claim 2, wherein the air conditioner further comprises a refrigerant throttling device provided on the defrost line, and a pressure adjusting device provided at an inflow end of each outdoor heat exchanger; and controlling the target outdoor heat exchanger to be defrosted to execute a corresponding defrosting scheme according to the frosting degree, wherein the method comprises the following steps of:

determining a target pressure of the target outdoor heat exchanger according to a first corresponding relation between frosting degree and defrosting pressure;

and adjusting the operating parameters of the defrosting throttle device and the pressure adjusting device according to the target pressure.

4. A method according to claim 3, wherein said adjusting the operating parameters of the defrost throttle and the pressure adjustment device in accordance with the target pressure comprises:

determining a first target opening of the defrosting throttle device according to a second corresponding relation between the target pressure and the opening of the defrosting throttle device;

adjusting the opening of the defrosting throttling device to a first target opening; and adjusting the opening degree of the pressure adjusting device according to the current pressure and the target pressure of the target outdoor heat exchanger.

5. The method of claim 1, wherein determining that the outdoor heat exchanger meets the frosting condition comprises:

acquiring the coil temperature of the outdoor heat exchanger;

and determining that the outdoor heat exchanger meets the frosting condition under the condition that the temperature of the coil pipe is less than or equal to a second temperature threshold value.

6. The method according to any one of claims 1 to 5, further comprising:

and controlling the rotating speed of the outdoor fan according to the frosting degree.

7. The method of claim 6, wherein controlling the rotational speed of the outdoor fan according to the degree of frosting comprises:

under the condition that the frosting degree is the first grade, controlling the outdoor fan to keep the current rotating speed;

and under the condition that the frosting degree is the second grade, controlling the outdoor fan to operate at the lowest gear rotating speed.

8. A control apparatus for defrosting an air conditioner in a high humidity environment, comprising a processor and a memory storing program instructions, wherein the processor is configured to execute the control method for defrosting an air conditioner according to any one of claims 1 to 7 when the program instructions are executed.

9. An air conditioner comprising the control device for defrosting an air conditioner according to claim 8.

10. A storage medium storing program instructions which, when executed, perform the control method for defrosting an air conditioner according to any one of claims 1 to 7.