WO2019128356A1 - Air conditioner and defrosting control method therefor - Google Patents

Abstract

Disclosed in the present application is an air conditioner and a defrosting control method therefor, relating to the technical field of air conditioners. An outdoor heat exchanger of the air conditioner comprises at least one first heat exchange fin set arranged on an upper part and at least one second heat exchange fin set arranged on a lower part; the air conditioner also comprises a controller, the controller being used for: determining whether preset defrosting operating conditions are met; if so, then controlling the air conditioner to operate in a defrosting mode; when running in a defrosting mode, controlling the first heat exchange fin set to be in communication with a refrigerant circulation pipeline, and blocking the communication of the second heat exchange fin set with the refrigerant circulation pipeline; and, after the first heat exchange fin set completes defrosting, blocking the communication of the first heat exchange fin set with the refrigerant circulation pipeline and controlling the second heat exchange fin set to be in communication with the refrigerant circulation pipeline. The top then bottom defrosting order can reduce the total defrosting time of the outdoor heat exchanger, and can avoid the problem of the melted frost water of the upper heat exchange fin set from recondensing on the lower heat exchange fin set.

Description

Air conditioner and defrosting control method

The present application is filed on the basis of the Chinese Patent Application No. PCT Application No.

Technical field

This paper relates to the field of air conditioning technology, and in particular to an air conditioning and defrosting control method.

Background technique

The multi-connected air conditioner has the characteristics of online flexibility, internal machine can be hidden and installed, and high performance. It is generally used in commercial places, such as large shopping malls, office buildings, hotels, etc.; multiple indoor units of multi-connected air conditioners generally share the same large outdoor unit. In winter or severe cold weather conditions, the heat exchanger of the larger outdoor unit tends to condense more frost, which affects the heat exchange efficiency of the heat exchanger. At this time, the air conditioner needs to run the defrosting mode to exchange heat with the outdoor unit. Defrost is generally performed. The control method of the outdoor heat exchanger during the defrosting operation of the air conditioner is basically the same, that is, the flow rate of the refrigerant of all the heat exchangers of the outdoor unit is almost the same during the defrosting operation, and the synchronous start and stop For the lower part of the heat exchanger, the frost water after defrosting mainly drops on the chassis, and for the upper part of the heat exchanger, the molten frost water needs to pass through the lower half to drip onto the chassis. The flow path is long; therefore, when the air conditioner stops running the defrost mode, the upper half of the melted frost water is easily re-condensed in the lower half by the influence of the outdoor temperature, therefore, the same The actual effect of poor defrost starting or stopping the defrost control mode, easily lead to the lower half of the outdoor heat exchanger of ice measuring points in the number of issues.

Summary of the invention

This paper provides an air conditioning and defrosting control method, which aims to solve the problem that the conventional air conditioning defrosting control method easily leads to an increase in frost condensation in the lower half of the outdoor heat exchanger. In order to have a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This generalization is not a general comment, nor is it intended to identify key/critical constituent elements or to describe the scope of protection of these embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the following detailed description.

According to a first aspect of the present invention, there is provided an air conditioner, an outdoor heat exchanger for an air conditioner comprising at least one first heat exchange sheet group at an upper portion and at least one second heat exchange sheet group at a lower portion, a first heat exchange sheet The group and the second heat exchange sheet group are respectively connected to the refrigerant circulation line of the air conditioner;

The air conditioner further includes a controller, wherein the controller is configured to: determine whether the preset defrosting operating condition is met; if satisfied, control the air conditioning to operate the defrosting mode, wherein, when operating in the defrosting mode, controlling to turn on the first heat exchange sheet The group is connected with the refrigerant circulation pipeline to block the communication between the second heat exchange sheet group and the refrigerant circulation pipeline; after the defrosting of the first heat exchange sheet group is completed, the first heat exchange sheet group and the refrigerant circulation pipe are controlled to be blocked. The communication of the road connects the second heat exchange sheet group to the refrigerant circulation line.

In an optional implementation manner, the preset defrosting operation condition includes: receiving a control instruction of the air conditioning operation defrosting mode input by the user; or, the outdoor ambient temperature is lower than the set temperature threshold.

In an optional implementation manner, the first heat exchange sheet is disposed in a first outdoor heat exchange branch connected to the refrigerant circulation line, and the second heat exchange sheet is disposed in the refrigerant circulation line. a second outdoor heat exchange branch, the first outdoor heat exchange branch is connected in parallel with the second outdoor heat exchange branch, wherein the first outdoor heat exchange branch is provided with a first control valve, and the second outdoor heat exchange branch is provided Second control valve;

The controller is specifically configured to: control a first control valve that opens the first outdoor heat exchange branch, and control a second control valve that closes the second outdoor heat exchange branch; and control to close the first outdoor heat exchange branch The valve is controlled and controls a second control valve that opens the second outdoor heat exchange branch.

In an optional embodiment, the air conditioner further includes a four-way valve for controlling the flow direction of the refrigerant in the refrigerant circulation line, and the four-way valve has a connection between the exhaust port of the compressor and the outdoor heat exchanger, and the suction port a first valve position communicating with the indoor heat exchanger, and a second valve position connecting the exhaust port of the compressor and the indoor heat exchanger, and the intake port and the outdoor heat exchanger;

The controller is specifically configured to: control the four-way valve to switch to the state of being in the first valve position.

In an optional embodiment, the controller is further configured to:

Obtain the accumulated time of the air conditioning operation defrosting mode;

When the accumulated time reaches the preset time threshold, it is determined that the first heat exchange sheet group is defrosted.

According to a second aspect of the present invention, there is also provided an air conditioning defrosting control method, the outdoor heat exchanger of the air conditioner comprising at least one first heat exchange sheet group located at an upper portion and at least one second heat exchange sheet group at a lower portion The first heat exchange sheet group and the second heat exchange sheet group are respectively connected to the refrigerant circulation line of the air conditioner;

The control method includes: determining whether the preset defrosting operation condition is satisfied; if satisfied, controlling the air conditioning operation defrosting mode, wherein, when operating in the defrosting mode, controlling the conduction of the first heat exchange sheet group and the refrigerant circulation line Connected to block the communication between the second heat exchange sheet group and the refrigerant circulation line; after the defrosting of the first heat exchange sheet group is completed, the control blocks the communication between the first heat exchange sheet group and the refrigerant circulation line, and conducts The second heat exchange sheet group is in communication with the refrigerant circulation line.

In an optional implementation manner, the preset defrosting operation condition includes: receiving a control instruction of the air conditioning operation defrosting mode input by the user; or, the outdoor ambient temperature is lower than the set temperature threshold.

In an optional implementation manner, the first heat exchange sheet is disposed in a first outdoor heat exchange branch connected to the refrigerant circulation line, and the second heat exchange sheet is disposed in the refrigerant circulation line. a second outdoor heat exchange branch, the first outdoor heat exchange branch is connected in parallel with the second outdoor heat exchange branch, wherein the first outdoor heat exchange branch is provided with a first control valve, and the second outdoor heat exchange branch is provided Second control valve;

Controlling the communication between the first heat exchange sheet group and the refrigerant circulation pipeline, and blocking the communication between the second heat exchange sheet group and the refrigerant circulation pipeline, including: controlling the first control valve that opens the first outdoor heat exchange branch, And controlling to close the second control valve of the second outdoor heat exchange branch; controlling to block the communication between the first heat exchange sheet group and the refrigerant circulation pipeline, and to open the communication between the second heat exchange sheet group and the refrigerant circulation pipeline, including : controlling to close the first control valve of the first outdoor heat exchange branch and controlling to open the second control valve of the second outdoor heat exchange branch.

In an optional embodiment, the air conditioner further includes a four-way valve for controlling the flow direction of the refrigerant in the refrigerant circulation line, and the four-way valve has a connection between the exhaust port of the compressor and the outdoor heat exchanger, and the suction port a first valve position communicating with the indoor heat exchanger, and a second valve position connecting the exhaust port of the compressor and the indoor heat exchanger, and the intake port and the outdoor heat exchanger;

Controlling the air conditioning operation defrosting mode includes: controlling the four-way valve to switch to the state of being in the first valve position.

In an optional implementation manner, before controlling to block the communication between the first heat exchange sheet group and the refrigerant circulation pipeline, and to open the communication between the second heat exchange sheet group and the refrigerant circulation pipeline, the control method further includes:

Obtain the accumulated time of the air conditioning operation defrosting mode;

When the accumulated time reaches the preset time threshold, it is determined that the first heat exchange sheet group is defrosted.

The beneficial effects of the above technical solutions are as follows:

The air conditioning provided in this paper considers that the frost water generated by defrosting will flow from top to bottom due to the influence of gravity. Therefore, the on/off control of the refrigerant flow of different heat exchanger groups of the outdoor heat exchanger is carried out from top to bottom. Switching on or blocking the corresponding refrigerant circuit, so that the heat absorbed by the external heat exchanger and the heat generated by the compressor will more defrosting the heat exchange sheet group that is currently connected to the pipeline, and more directly Part of the heat exchanger is frosted off; and, by the defrosting sequence of the upper and lower parts, the frost water melted by the upper heat exchange sheet group can continue to flow down the outdoor heat exchanger, which can be the lower part The defrosting action of the heat exchange sheet group extracts the preheating, and the frost water generated by the defrosting of the upper heat exchange sheet group also melts the frost of the lower heat exchange sheet group, which is beneficial to shorten the overall division of the outdoor heat exchanger. The frost time, and the problem that the frost water melted by the upper heat exchange sheet group re-condenses in the lower heat exchange sheet group can be avoided.

The above general description and the following detailed description are merely exemplary and explanatory and are not limiting.

DRAWINGS

The drawings herein are incorporated in and constitute a part of the specification, and are in the

1 is a schematic structural view of an air conditioner of the present disclosure, according to an exemplary embodiment;

2 is a flow chart of a defrosting control method herein, according to an exemplary embodiment.

Among them, 1, indoor unit; 11, indoor heat exchanger;

2. Outdoor unit; 21, outdoor heat exchanger; 211, first heat exchange sheet set; 212., second heat exchange sheet group; 22, compressor; 23, four-way valve;

3. The refrigerant circulation pipeline; 31, the first outdoor heat exchange branch; 32, the second outdoor heat exchange branch;

41. A first control valve; 42. a second control valve.

Detailed ways

The following description and the annexed drawings are intended to illustrate the specific embodiments herein Other embodiments may include structural, logical, electrical, process, and other changes. The examples represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operations may vary. Portions and features of some embodiments may be included or substituted for portions and features of other embodiments. The scope of the embodiments herein includes the full scope of the claims, and all equivalents of the claims. In this context, various embodiments may be referred to individually or collectively by the term "invention," for convenience only, and if more than one invention is disclosed, it is not intended to automatically limit the scope of the application to any A single invention or inventive concept. Herein, relational terms such as first and second are used merely to distinguish one entity or operation from another entity or operation, and do not require or imply any actual relationship between the entities or operations or order. Furthermore, the terms "comprises" or "comprising" or "comprising" or any other variations are intended to encompass a non-exclusive inclusion, such that a process, method, or device that includes a plurality of elements includes not only those elements but also other items not specifically listed. Elements, or elements that are inherent to such a process, method, or device. An element that is defined by the phrase "comprising a ..." does not exclude the presence of additional equivalent elements in the process, method, or device that comprises the element. The various embodiments herein are described in a progressive manner, and each embodiment focuses on differences from other embodiments, and the same similar parts between the various embodiments may be referred to each other. For the method, product, and the like disclosed in the embodiments, since it corresponds to the method part disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

1 is a schematic structural view of an air conditioner of the present disclosure, according to an exemplary embodiment.

As shown in FIG. 1 , an air conditioner is provided. The air conditioner includes an indoor unit 1 and an outdoor unit 2, wherein the indoor unit 1 includes one or more independent indoor units, and each indoor unit has an indoor heat exchanger 11 . The outdoor unit 2 includes an outdoor unit, and the outdoor unit includes an outdoor heat exchanger 21; the indoor heat exchangers 11 of the plurality of indoor units are connected in parallel to the refrigerant circulation line 3 of the air conditioner, and can pass through the refrigerant circulation line 3 and the outdoor unit, respectively. The outdoor heat exchanger 21 performs cyclic exchange of high and low temperature refrigerants. The plurality of indoor units may be respectively disposed in different or the same indoor scene, and the outdoor unit is disposed in the outdoor scene. In the following embodiments, the multiple indoor air conditioners composed of the plurality of indoor units and one outdoor unit are mainly explained. Description.

Here, the outdoor heat exchanger 21 of the air conditioner includes a plurality of heat exchange sheet groups including at least one first heat exchange sheet group 211 at the upper portion and at least one second heat exchange sheet group 212 at the lower portion, the upper and lower portions are Refers to the arrangement relationship of the two heat exchange sheet groups in the space height position in the outdoor unit, and the second heat exchange sheet group 212 is located below the first heat exchange sheet group 211; of course, the air conditioner applied herein is not limited to the upper and lower layers. The structure of the outdoor heat exchanger 21 can also be applied to an outdoor heat exchanger 21 pattern including a heat exchange sheet group at an intermediate position, such as an upper, middle and lower heat exchange sheet group. Here, for the structural form of the outdoor heat exchanger 21 of two or more layers, one or more heat exchange sheet groups above may be divided into the aforementioned first heat exchange sheet group 211, and the other is divided into the second heat exchange sheet. The group 212, if the upper and middle heat exchange sheet groups are divided into the first heat exchange sheet group 211, the above lower heat exchange sheet group is divided into the second heat exchange sheet group 212; or, the one or the lower heat exchange sheet group 212 The plurality of heat exchange sheet groups are divided into the foregoing second heat exchange sheet group 212, and the other ones are divided into the first heat exchange sheet group 211. For example, the middle and lower heat exchange sheet groups are divided into the second heat exchange sheet group 212. The upper heat exchange sheet group is divided into the first heat exchange sheet group 211.

In this embodiment, the first heat exchange sheet group 211 and the second heat exchange sheet group 212 are respectively connected to the refrigerant circulation line 3 of the air conditioner, and the refrigerant in the refrigerant circulation line 3 can flow through the first heat exchange sheet group respectively. 211 and the second heat exchange sheet group 212, and when the air conditioner operates the defrosting mode, the defrosting is performed by using the heat of the refrigerant flowing through the different heat exchange sheet groups, respectively.

In an optional embodiment, the defrosting mode of the air conditioner operation is a conventional defrosting mode. Specifically, the defrosting mode includes the refrigerant circulating circuit of the air conditioner being switched to the same refrigerant flow direction as the cooling mode, that is, the compressor The refrigerant discharged from the exhaust port of 22 first flows through the outdoor heat exchanger 21, and then flows to the indoor heat exchanger 11, and finally, the refrigerant flows from the indoor heat exchanger 11 back to the suction port of the compressor 22; The temperature of the refrigerant discharged from the exhaust port carries a large amount of heat, and the temperature thereof is high. Therefore, when flowing through the outdoor heat exchanger 21, the heat of the high-temperature refrigerant is transferred to the outer surface of the outdoor heat exchanger 21, so that The frost condensed on the outer surface of the outdoor heat exchanger 21 absorbs heat and then melts, thereby achieving the purpose of defrosting.

Specifically, the air conditioner herein further includes a controller (not shown) for controlling the defrosting operation of the outdoor heat exchanger 21; the controller is configured to:

Determining whether the preset defrosting operation condition is satisfied;

In an embodiment, the preset defrosting operation condition includes: receiving a control instruction of the air conditioning operation defrosting mode input by the user. Generally, when there is too much condensed frost on the outdoor heat exchanger 21 of the outdoor unit of the air conditioner, the amount of heat exchange between the outdoor heat exchanger 21 and the outdoor environment is reduced, and the heating performance of the air conditioner itself is lowered, so that the user can pass the remote controller. And an air conditioning accessory such as a control panel sends a control command to start the operation of the defrost mode to the air conditioner main body, and after receiving the control, the air conditioner can determine that the preset defrost operation condition is satisfied.

Alternatively, in another embodiment, the outdoor unit of the air conditioner is generally provided with an outdoor ambient temperature sensor for detecting the outdoor ambient temperature; when the outdoor ambient temperature is low, an icing frost temperature is generated on the outdoor heat exchanger 21, According to the actual change of the outdoor ambient temperature, the icing state on the outdoor heat exchanger 21 can be estimated to some extent. Therefore, in the embodiment, the preset defrosting operating conditions include the outdoor ambient temperature being lower than the set temperature. Threshold value; the set temperature threshold is a threshold parameter that is easily icing in the outdoor heat exchanger 21 determined in advance by experiments or the like, and appears on the outdoor heat exchanger 21 when the outdoor temperature reaches or falls below the set temperature threshold. Icing problem. Therefore, when the controller compares that the outdoor ambient temperature detected by the outdoor ambient temperature sensor is lower than the pre-stored set temperature threshold, it can be determined that the preset defrosting operating condition is satisfied.

Preferably, the air conditioner may further be provided with a defrosting sensor for detecting the coil temperature of the outdoor heat exchanger 21 to determine whether the coil temperature is likely to cause outdoor according to the actual coil temperature of the outdoor heat exchanger 21. The outer surface of the heat exchanger 21 is frosted; therefore, the controller can also preset a coil temperature threshold to determine whether the preset defrost operation is satisfied according to the comparison between the coil temperature threshold and the actual coil temperature. condition. Compared with the foregoing comparison between the outdoor ambient temperature and the set temperature threshold, the actual coil temperature detected by the defrosting sensor is closer to the outer surface temperature of the outdoor heat exchanger 21 where the icing frosting problem occurs, and thus Effectively improve the accuracy of judgment control.

If the preset defrosting operation condition is satisfied, the air conditioning operation defrosting mode is controlled, wherein, when operating in the defrosting mode, the high temperature refrigerant discharged from the compressor 22 first flows to the outdoor heat exchanger 21; meanwhile, the control is turned on first The heat exchange sheet group 211 is in communication with the refrigerant circulation line 3. At this time, the first heat exchange sheet group 211 is in communication with the refrigerant circulation line 3, and the high temperature refrigerant discharged from the compressor 22 can flow through the first heat exchanger sheet group. And defrosting the first heat exchange sheet group 211 by the heat of the high temperature refrigerant; and blocking the communication between the second heat exchange sheet group 212 and the refrigerant circulation line 3, at this time, the second heat exchange sheet group 212 and the refrigerant The circulation line 3 is not connected, and the high-temperature refrigerant discharged from the compressor 22 does not flow through the second heat exchange sheet group 212.

After the defrosting of the first heat exchange sheet group 211 is completed, the control blocks the communication between the first heat exchange sheet group 211 and the refrigerant circulation line 3. At this time, the first heat exchange sheet group 211 and the refrigerant circulation line 3 are not connected. The high temperature refrigerant discharged from the compressor 22 does not flow through the second heat exchange sheet group 212; and, the second heat exchange sheet group 212 is connected to the refrigerant circulation line 3, and at this time, the second heat exchange sheet group 212 is The refrigerant circulation line 3 is connected, and the high-temperature refrigerant discharged from the compressor 22 can flow through the second heat exchanger sheet group, and the second heat exchange sheet group 212 is defrosted by the heat of the high-temperature refrigerant.

By the defrosting sequence of the upper and lower parts, the frost water melted by the upper heat exchange sheet group can continue to flow down the outdoor heat exchanger 21, and the defrosting action of the lower heat exchange sheet group can be extracted. The hot, and the frost water generated by the defrosting of the upper heat exchange sheet group also melts the frost of the lower heat exchange sheet group, which is advantageous for shortening the overall defrosting time of the outdoor heat exchanger 21, and can avoid the upper exchange. The problem of re-condensation of the frost water melted by the hot pack in the lower heat exchange sheet group.

In the air conditioning structure shown in the present disclosure, the first heat exchange sheet group 211 is disposed in the first outdoor heat exchange branch 31 communicating with the refrigerant circulation line 3, and the second heat exchange sheet group 212 is disposed in the refrigerant circulation tube. The second outdoor heat exchange branch 32, the first outdoor heat exchange branch 31 and the second outdoor heat exchange branch 32 are connected in parallel, wherein the first outdoor heat exchange branch 31 is provided with a first control valve 41. The second outdoor heat exchange branch 32 is provided with a second control valve 42. In the embodiment, the first control valve 41 is disposed on one side of the liquid inlet end of the first heat exchange sheet group 211, and the second outdoor heat exchange branch The path 32 is disposed on one side of the liquid inlet end of the second heat exchange sheet group 212.

Therefore, in the first stage of defrosting the first heat exchange sheet group 211, the controller is specifically configured to: control the first control valve 41 that opens the first outdoor heat exchange branch 31, and control to close the second outdoor heat exchange branch The second control valve 42 of the road 32; in the second stage of defrosting the second heat exchange sheet group 212, the controller is specifically configured to: control the first control valve 41 that closes the first outdoor heat exchange branch 31, and control The second control valve 42 of the second outdoor heat exchange branch 32 is opened.

In the embodiment herein, the air conditioner further includes a four-way valve 23 for controlling the flow direction of the refrigerant in the refrigerant circulation line 3, and the four-way valve 23 has the exhaust port of the compressor 22 and the outdoor heat exchanger 21 connected and sucked. a first valve position in which the gas port and the indoor heat exchanger 11 are in communication, and a second valve position that connects the exhaust port of the compressor 22 with the indoor heat exchanger 11 and the intake port and the outdoor heat exchanger 21;

Thus, when the air conditioner needs to operate the defrosting mode, the controller can control the four-way valve 23 to switch to the state of the first valve position, so that the exhaust port of the compressor 22 communicates with the outdoor heat exchanger 21, the suction port, and the indoor When the heat exchanger 11 is connected, the refrigerant circulation line 3 can be switched to the same refrigerant flow direction as the cooling mode, and the high-temperature refrigerant discharged from the compressor 22 flows through the outdoor heat exchanger 21 first, and the outdoor heat exchanger 21 is defrosted. .

In an embodiment of the present invention, the controller is further configured to determine whether the first heat exchange sheet group 211 completes the defrosting to switch to the foregoing pair of the second heat exchange sheet after the first heat exchange sheet group 211 completes the defrosting The group 212 performs defrosting; specifically, the controller determines that the first heat exchange sheet group 211 is defrosting:

Obtain the accumulated time of the air conditioning operation defrosting mode;

Generally, when the air conditioner satisfies the preset defrosting operating condition, the air conditioner is switched from the heating mode to the defrosting mode, and at this time, the controller performs timing.

When the accumulated time reaches the preset time threshold, it is determined that the first heat exchange sheet group 211 is defrosted.

The controller also pre-stores one or more time thresholds, and the plurality of time thresholds are different experimental conditions for different outdoor temperature conditions, and the first heat exchange sheet group 211 substantially completes the defrosting duration required for defrosting, and therefore, Comparing the accumulated time of the air conditioning operation defrosting mode and the preset time threshold, it can be determined whether the first heat exchange sheet group 211 substantially completes the defrosting under the current outdoor temperature condition; determining that the first heat exchange sheet group 211 is substantially completed In the case of frost, it is possible to switch to defrosting the second heat exchange sheet group 212.

Alternatively, in another embodiment of the present invention, the controller may further determine whether the defrosting is completed according to the current coil temperature of the first heat exchanger; specifically, the controller determines that the first heat exchange sheet group 211 is defrosted. The process includes: obtaining a current coil temperature of the first heat exchange sheet group 211 detected by the defrosting sensor; and determining that the defrosting of the first heat exchange sheet group 211 is completed when the current coil temperature reaches a preset temperature threshold.

2 is a flow chart 1 of a defrosting control method of the present invention, according to an exemplary embodiment;

The present invention also provides an air conditioning defrosting control method, wherein the outdoor heat exchanger of the air conditioner to be applied includes at least one first heat exchange sheet group located at the upper portion and at least one second heat exchange sheet group located at the lower portion, the first exchange The hot sheet group and the second heat exchange sheet group are respectively connected to the refrigerant circulation line of the air conditioner;

Control methods include:

S201, determining whether the preset defrosting operation condition is satisfied, if yes, executing step S202, if not, repeating step S201;

S202, controlling air conditioning operation defrosting mode,

S203. Control to conduct communication between the first heat exchange sheet group and the refrigerant circulation pipeline, and block communication between the second heat exchange sheet group and the refrigerant circulation pipeline;

S204. Determine whether the defrosting of the first heat exchange sheet group is completed. If yes, execute step S205. If not, keep the on/off state of S203 unchanged, and repeat the above determining process;

S205, controlling to block the communication between the first heat exchange sheet group and the refrigerant circulation pipeline, and to open the communication between the second heat exchange sheet group and the refrigerant circulation pipeline;

Until the defrosting of the second heat exchange sheet group is completed, the air conditioner exits the defrosting mode and switches back to the heating mode operation.

In the embodiment of the present disclosure, the defrosting operation condition preset in the determining process of step S201 includes:

Receiving a control command of the air conditioning operation defrosting mode input by the user; or

The outdoor ambient temperature is below the set temperature threshold.

In the embodiment of the present invention, a heat exchange sheet of the air conditioner is disposed in a first outdoor heat exchange branch connected to the refrigerant circulation pipeline, and the second heat exchange sheet is disposed in a communication with the refrigerant circulation pipeline. The second outdoor heat exchange branch, the first outdoor heat exchange branch is connected in parallel with the second outdoor heat exchange branch, wherein the first outdoor heat exchange branch is provided with a first control valve, and the second outdoor heat exchange branch is provided with a first Two control valves;

Therefore, in step S203, the communication between the first heat exchange sheet group and the refrigerant circulation line is controlled, and the communication between the second heat exchange sheet group and the refrigerant circulation line is blocked, including: controlling to open the first outdoor heat exchange branch. a first control valve and controlling a second control valve that closes the second outdoor heat exchange branch;

In step S205, the communication between the first heat exchange sheet group and the refrigerant circulation line is blocked, and the communication between the second heat exchange sheet group and the refrigerant circulation line is controlled, including: controlling to close the first outdoor heat exchange branch. The valve is controlled and controls a second control valve that opens the second outdoor heat exchange branch.

In the embodiments herein, the air conditioner further includes a four-way valve for controlling the flow direction of the refrigerant in the refrigerant circulation line, the four-way valve having the exhaust port of the compressor and the outdoor heat exchanger, the suction port, and the indoor a first valve position in which the heat exchanger is connected, and a second valve position that connects the exhaust port of the compressor to the indoor heat exchanger, and the intake port and the outdoor heat exchanger;

Therefore, controlling the air conditioner to operate the defrosting mode in step S202 includes: controlling the four-way valve to switch to the state of being in the first valve position.

In the embodiment of the present invention, the step of determining whether the defrosting of the first heat exchange sheet group is completed in step S204 includes:

Obtain the accumulated time of the air conditioning operation defrosting mode;

When the accumulated time reaches the preset time threshold, it is determined that the first heat exchange sheet group is defrosted.

It should be understood that the present invention is not limited to the details and the modifications and changes may be made without departing from the scope thereof. The scope of the disclosure is limited only by the accompanying claims.

Claims (10)

An air conditioner, characterized in that the outdoor heat exchanger of the air conditioner comprises at least one first heat exchange sheet group located at an upper portion and at least one second heat exchange sheet group located at a lower portion, the first heat exchange sheet The group and the second heat exchange sheet group are respectively connected to the refrigerant circulation line of the air conditioner; the air conditioner further includes a controller, wherein the controller is configured to: Determining whether the preset defrosting operation condition is satisfied; If yes, controlling the air conditioning to operate the defrosting mode, wherein, when operating in the defrosting mode, controlling conduction of the first heat exchange sheet group to communicate with the refrigerant circulation line to block the second heat exchange Connecting the sheet group to the refrigerant circulation line; after the defrosting of the first heat exchange sheet group is completed, controlling to block the communication between the first heat exchange sheet group and the refrigerant circulation line, and turning on the The two heat exchange sheet groups are in communication with the refrigerant circulation line. The air conditioner according to claim 1, wherein the preset defrosting operation condition comprises: Receiving a control command of the air conditioning operation defrosting mode input by the user; or The outdoor ambient temperature is below the set temperature threshold. The air conditioner according to claim 1, wherein the first heat exchange sheet is disposed in a first outdoor heat exchange branch connected to the refrigerant circulation line, and the second heat exchange sheet is assembled. a first outdoor heat exchange branch connected to the refrigerant circulation line, the first outdoor heat exchange branch being connected in parallel with the second outdoor heat exchange branch, wherein the first outdoor heat exchange branch a first control valve is disposed on the road, and a second control valve is disposed on the second outdoor heat exchange branch; The controller is specifically configured to: Controlling opening the first control valve of the first outdoor heat exchange branch and controlling closing the second control valve of the second outdoor heat exchange branch; Controlling closing the first control valve of the first outdoor heat exchange branch and controlling opening of the second control valve of the second outdoor heat exchange branch. The air conditioner according to claim 1, wherein said air conditioner further comprises a four-way valve for controlling a flow direction of the refrigerant in said refrigerant circulation line, said four-way valve having an exhaust port for the compressor and a first valve position in which the outdoor heat exchanger communicates, an intake port, and an indoor heat exchanger, and an exhaust port of the compressor and the indoor heat exchanger, an intake port, and the outdoor heat exchanger Connected second valve position; The controller is specifically configured to: The control four-way valve is switched to the state at the first valve position. The air conditioner according to claim 1, wherein the controller is further configured to: Obtaining an accumulated time of the air conditioner running the defrosting mode; When the accumulated time reaches a preset time threshold, it is determined that the first heat exchange sheet group is defrosted. An air conditioning defrosting control method, characterized in that the outdoor heat exchanger of the air conditioner comprises at least one first heat exchange sheet group located at an upper portion and at least one second heat exchange sheet group located at a lower portion, the first exchange The heat sheet group and the second heat exchange sheet group are respectively connected to the refrigerant circulation line of the air conditioner; the control method includes: Determining whether the preset defrosting operation condition is satisfied; If yes, controlling the air conditioning to operate the defrosting mode, wherein, when operating in the defrosting mode, controlling conduction of the first heat exchange sheet group to communicate with the refrigerant circulation line to block the second heat exchange Connecting the sheet group to the refrigerant circulation line; after the defrosting of the first heat exchange sheet group is completed, controlling to block the communication between the first heat exchange sheet group and the refrigerant circulation line, and turning on the The two heat exchange sheet groups are in communication with the refrigerant circulation line. The control method according to claim 6, wherein the preset defrosting operation condition comprises: Receiving a control command of the air conditioning operation defrosting mode input by the user; or The outdoor ambient temperature is below the set temperature threshold. The control method according to claim 6, wherein the first heat exchange sheet is disposed in a first outdoor heat exchange branch connected to the refrigerant circulation line, and the second heat exchange sheet group a second outdoor heat exchange branch connected to the refrigerant circulation line, wherein the first outdoor heat exchange branch is connected in parallel with the second outdoor heat exchange branch, wherein the first outdoor heat exchange a first control valve is disposed on the branch road, and a second control valve is disposed on the second outdoor heat exchange branch road; The controlling the communication between the first heat exchange sheet group and the refrigerant circulation pipeline to block the communication between the second heat exchange sheet group and the refrigerant circulation pipeline, including: Controlling opening the first control valve of the first outdoor heat exchange branch and controlling closing the second control valve of the second outdoor heat exchange branch; The controlling the communication between the first heat exchange sheet group and the refrigerant circulation line, and the communication between the second heat exchange sheet group and the refrigerant circulation line, including: Controlling closing the first control valve of the first outdoor heat exchange branch and controlling opening of the second control valve of the second outdoor heat exchange branch. The control method according to claim 6, wherein said air conditioner further comprises a four-way valve for controlling a flow direction of the refrigerant in said refrigerant circulation line, said four-way valve having an exhaust port for causing a compressor a first valve position communicating with the outdoor heat exchanger, the intake port and the indoor heat exchanger, and a communication between the exhaust port of the compressor and the indoor heat exchanger, the suction port and the outdoor heat exchange a second valve position connected to the device; The controlling the air conditioner to operate the defrost mode comprises: The control four-way valve is switched to the state at the first valve position. The control method according to claim 6, wherein the controlling blocks the communication between the first heat exchange sheet group and the refrigerant circulation line, and turns on the second heat exchange sheet group and the Before the communication of the refrigerant circulation pipeline, the control method further includes: Obtaining an accumulated time of the air conditioner running the defrosting mode; When the accumulated time reaches a preset time threshold, it is determined that the first heat exchange sheet group is defrosted.

Images