WO2023071227A1

WO2023071227A1 - Air conditioner and control method therefor

Info

Publication number: WO2023071227A1
Application number: PCT/CN2022/099078
Authority: WO
Inventors: 刘志萌; 宋龙; 任夫虎
Original assignee: 青岛海尔空调器有限总公司; 青岛海尔空调电子有限公司; 海尔智家股份有限公司
Priority date: 2021-10-28
Filing date: 2022-06-16
Publication date: 2023-05-04
Also published as: CN114060909A

Abstract

An air conditioner and a control method therefor. An outdoor unit of the air conditioner comprises an outdoor heat exchange branch (11) and a defrosting branch (12) connected to the outdoor heat exchange branch (11); the outdoor heat exchange branch (11) is provided with a compressor (112) and an outdoor heat exchanger (111); one end of the defrosting branch (12) is connected to an air discharge end of the compressor (112), and the other end is connected to an air inlet end of the compressor (112); at least a part of the defrosting branch (12) is provided on the surface of the outdoor heat exchanger (111), so that the defrosting branch (12) can bring to the outdoor heat exchanger (111) heat in a high-temperature and high-pressure gaseous refrigerant generated by the compressor (112). The control method controls connection/disconnection of the defrosting branch (12) according to the humidity near the outdoor heat exchanger (111), can accurately determine the defrosting occasion and ensure the heat exchange efficiency, and can solve the problem that the defrosting effect is affected and even heating of an indoor unit cannot be performed normally due to the fact that existing defrosting modes are poor.

Description

Air conditioner and its control method

technical field

The invention belongs to the technical field of air conditioners, and specifically provides an air conditioner and a control method thereof.

Background technique

The air conditioner includes an indoor unit, an outdoor unit, and a refrigerant circulation loop connected between the indoor unit and the outdoor unit. The refrigerant continuously exchanges heat between the outdoor unit and the indoor unit through the refrigerant circulation loop, thereby achieving the effect of changing the room temperature. Take the air conditioner running in heating mode as an example, since the coil of the outdoor unit is always in a low temperature state, and the outdoor temperature is usually low at this time, if the outdoor humidity is also high at this time, the coil of the outdoor unit will be very cold. Frosting is easy to occur, and as the frosting continues, the heat exchange efficiency of the outdoor unit will drop sharply, which will lead to the continuous attenuation of the heating capacity of the entire air conditioner. Therefore, under heating conditions, ensuring that the coils of the outdoor unit do not form frost is crucial to the heat exchange efficiency of the entire air conditioner.

In recent years, in order to effectively solve the problem of frosting, those skilled in the art have proposed many solutions, all of which can achieve the defrosting effect, but each still has some problems. Take the method of controlling the reverse cycle of refrigerant to achieve defrosting as an example, this method will directly cause the indoor unit to fail to heat normally, thus affecting the user's normal heating experience; and take the method of setting heating components to achieve defrosting as an example, This method not only consumes more energy consumption, but also has the problems of low heating efficiency and low defrosting efficiency.

Correspondingly, the art needs a new air conditioner and its control method to solve the above problems.

Contents of the invention

The present invention aims to solve the above-mentioned technical problems, that is, to solve the problem that the defrosting method of the existing air conditioner is not good, which easily affects the defrosting effect, and even causes the indoor unit to fail to heat normally.

In a first aspect, the present invention provides a control method of an air conditioner, the outdoor unit of the air conditioner includes an outdoor heat exchange branch and a defrosting branch connected to the outdoor heat exchange branch,

A compressor and an outdoor heat exchanger are arranged on the outdoor heat exchange branch,

One end of the defrosting branch is connected to the exhaust end of the compressor, the other end of the defrosting branch is connected to the intake end of the compressor, and at least a part of the defrosting branch is provided with on the surface of the outdoor heat exchanger;

The control methods include:

Obtain the humidity near the outdoor heat exchanger;

The on-off state of the defrosting branch is controlled according to the humidity near the outdoor heat exchanger.

In the preferred technical solution of the above control method, the step of "obtaining the humidity near the outdoor heat exchanger" specifically includes:

obtaining humidity at multiple reference points on the outdoor heat exchanger;

Calculate the average value of the humidity at multiple reference points on the outdoor heat exchanger, and record it as the humidity near the outdoor heat exchanger;

The step of "controlling the on-off state of the defrosting branch according to the humidity near the outdoor heat exchanger" specifically includes:

The on-off state of the defrosting branch is controlled according to the average value of humidity at multiple reference points on the outdoor heat exchanger.

In a preferred technical solution of the above control method, some of the plurality of reference points are located near the defrosting branch.

In the preferred technical solution of the above control method, the step of "controlling the on-off state of the defrosting branch according to the average value of the humidity at multiple reference points on the outdoor heat exchanger" specifically includes:

If the average value of humidity at multiple reference points on the outdoor heat exchanger is greater than a first preset humidity, the defrosting branch is controlled to be connected.

In a preferred technical solution of the above control method, the first preset humidity is 67%.

In the preferred technical solution of the above control method, the control method also includes:

When the defrosting branch is connected, obtain the humidity near the outdoor heat exchanger again;

The defrosting branch is selectively controlled to be cut off according to the humidity near the outdoor heat exchanger obtained again.

In the preferred technical solution of the above control method, the step of "selectively controlling the cutting off of the defrosting branch according to the humidity near the outdoor heat exchanger obtained again" specifically includes:

If the acquired humidity near the outdoor heat exchanger is lower than the second preset humidity, the defrosting branch is controlled to be cut off.

In the preferred technical solution of the above control method, the step of "if the acquired humidity near the outdoor heat exchanger is less than the second preset humidity, then control the defrosting branch to cut off" specifically includes:

If the acquired humidity near the outdoor heat exchanger is lower than the second preset humidity, the defrosting branch is controlled to be cut off after a preset time period.

In the preferred technical solution of the above control method, the preset time length is 5 minutes.

In another aspect, the present invention also provides an air conditioner, the air conditioner includes a controller, and the controller can execute the control method described in any one of the above preferred technical solutions.

In the case of adopting the above technical solution, the outdoor unit of the air conditioner of the present invention includes an outdoor heat exchange branch and a defrosting branch connected to the outdoor heat exchange branch, and a compressor is arranged on the outdoor heat exchange branch and an outdoor heat exchanger, one end of the defrosting branch is connected to the discharge end of the compressor, the other end of the defrosting branch is connected to the intake end of the compressor, and the defrosting At least a part of the branch is provided on the surface of the outdoor heat exchanger. Based on the above structural configuration, the present invention can bring the heat in the high-temperature and high-pressure gaseous refrigerant generated by the compressor to the outdoor heat exchanger through the defrosting branch circuit, and the outdoor heat exchanger has not yet been frosted. It can effectively prevent the generation of frost, and when the outdoor heat exchanger has frost, it can also effectively remove the frost under the condition that the indoor heat exchanger can be heated normally, and the defrosting efficiency of this defrosting method is high. , less energy consumption, can avoid the occurrence of frost in the outdoor heat exchanger to the greatest extent, and then effectively ensure the heat exchange efficiency of the outdoor heat exchanger. In addition, the control method of the present invention includes: obtaining the humidity near the outdoor heat exchanger, and controlling the on-off state of the defrosting branch according to the humidity near the outdoor heat exchanger, so that the air conditioner can accurately Judge the timing of defrosting, so as to effectively avoid the occurrence of frost, and then ensure the maximum heat exchange efficiency.

Description of drawings

Describe preferred embodiment of the present invention below in conjunction with accompanying drawing, in the accompanying drawing:

Fig. 1 is a partial schematic diagram of the internal structure of the air conditioner outdoor unit of the present invention;

Fig. 2 is the flow chart of main steps of the control method of the present invention;

Fig. 3 is the specific step flowchart of the preferred embodiment of control method of the present invention;

Reference signs:

11. Outdoor heat exchange branch; 111. Outdoor heat exchanger; 112. Compressor; 113. Gas-liquid separator;

12. Defrost branch; 121. First defrosting section; 122. Second defrosting section; 123. One-way valve;

13. Base;

101. Humidity sensor.

Detailed ways

Preferred embodiments of the present invention are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the present invention, and are not intended to limit the protection scope of the present invention. Those skilled in the art can make adjustments as needed so as to adapt to specific applications. For example, the air conditioner of the present invention may be a multi-connected air conditioner, or a one-to-one air conditioner; the indoor unit of the air conditioner may be a wall-mounted indoor unit, or a cabinet-type indoor unit. Such changes related to specific types of air conditioners do not deviate from the basic principle of the present invention, and belong to the protection scope of the present invention.

It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and so on indicate directions or The terms of positional relationship are based on the direction or positional relationship shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood To limit the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and should not be understood as indicating or implying relative importance.

In addition, it should be noted that, in the description of the present invention, unless otherwise specified and limited, the terms "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , or integrally connected; it can be directly connected, or indirectly connected through an intermediary, and it can be the internal communication of two components. Those skilled in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

First refer to FIG. 1 , which is a partial schematic diagram of the internal structure of the air conditioner outdoor unit of the present invention. Specifically, the air conditioner of the present invention includes an air conditioner indoor unit and an air conditioner outdoor unit, a refrigerant circulation circuit is arranged between the air conditioner indoor unit and the air conditioner outdoor unit, and the refrigerant circulation circuit is used for indoor and outdoor air conditioning. The refrigerant for heat exchange includes two parts: an indoor heat exchange branch circuit and an outdoor heat exchange branch circuit 11 . Further, the refrigerant circulation circuit is provided with an indoor heat exchanger, a compressor 112, a four-way valve, an outdoor heat exchanger 111 and an electronic expansion valve; wherein the indoor heat exchanger is located on the indoor heat exchange branch , the compressor 112 and the outdoor heat exchanger 111 are located on the outdoor heat exchange branch 11, and the refrigerant circulates continuously between the indoor heat exchanger and the outdoor heat exchanger through the refrigerant circulation loop to realize heat exchange, When the four-way valve is reversing, it can control the reverse cycle of the refrigerant in the refrigerant circulation circuit, so that the air conditioner can be switched between the cooling working condition and the heating working condition. It should be noted that the present invention does not impose any restrictions on the specific structure of the air conditioner, and technicians can set it by themselves according to actual use requirements; for example, the specific structure and number of installations of the air conditioner indoor unit and the air conditioner outdoor unit The specific type and quantity of the indoor heat exchanger and the outdoor heat exchanger 111, and other heat exchange elements and the like are also arranged on the refrigerant circulation circuit.

Further, the air conditioner outdoor unit of the present invention also includes a defrosting branch 12 connected to the outdoor heat exchange branch 11, one end of the defrosting branch 12 is connected to the exhaust end of the compressor 112, and the other end of the defrosting branch 12 One end is connected to the intake end of the compressor 112 , and at least a part of the defrosting branch 12 is disposed on the surface of the outdoor heat exchanger 111 . It should be noted that the present invention does not impose any restrictions on the specific shape of the defrosting branch 12 and the connection positions of its two ends, and technicians can set it by themselves according to actual needs, as long as the defrosting branch 12 can exhaust the compressor 112 The high-temperature and high-pressure gaseous refrigerant discharged from the end is led to the surface of the outdoor heat exchanger 111 to realize defrosting, and then sent back to the outdoor heat exchange branch 11 through the intake end of the compressor 112 .

Continue to refer to FIG. 1 , as shown in FIG. 1 , in this preferred embodiment, a gas-liquid separator 113 is also provided on the outdoor heat exchange branch 11 , wherein the gas-liquid separator 113 is arranged at the intake end of the compressor 112 That is, the refrigerant enters the compressor 112 only after passing through the gas-liquid separator 113 , thereby effectively avoiding the liquid hammer phenomenon and better protecting the use safety of the compressor 112 . Of course, this is not a restrictive arrangement, and the outdoor heat exchange branch 11 may not be provided with a gas-liquid separator 113; moreover, the present invention does not impose any restrictions on the specific type of the gas-liquid separator 113, and technicians can Set it yourself according to actual usage needs.

Based on the setting of the gas-liquid separator 113, as a preferred connection mode, the other end of the defrosting branch 12 is preferably connected to the inlet end of the gas-liquid separator 113, so as to avoid the generation of liquid hammer phenomenon to the greatest extent; of course, this It is only a preferred arrangement, and the other end of the defrosting branch 12 can also be directly connected to the intake end of the compressor 112 , which is not restrictive, and technicians can set it according to actual needs.

As a preferred arrangement, the defrosting branch 12 is a capillary structure, that is, the defrosting branch 12 is composed of capillaries, so as to effectively ensure the pressure balance while ensuring the defrosting effect; There are no restrictions on the specific type and diameter of the capillary structure described above, and technicians can set them according to actual use requirements.

Further preferably, a one-way valve 123 is also provided on the defrosting branch 12. In this preferred embodiment, the one-way valve 123 is arranged near the exhaust port of the compressor 112. The one-way valve 123 can not only control the defrosting branch The on-off state of the circuit 12 can also effectively control the flow direction of the refrigerant in the defrosting branch circuit 12. Of course, the present invention does not impose any restrictions on the specific type and setting position of the check valve 123, and technicians can set it by themselves according to actual use requirements. Certainly. In addition, it should be noted that although the control valve described in this preferred embodiment is the one-way valve 123, this is not restrictive. The control valve can also be other types of valves, as long as it can control The on-off state of the frost branch 12 is sufficient.

In addition, in this preferred embodiment, the outdoor unit of the air conditioner of the present invention includes a housing, and the heat exchange elements of the outdoor unit of the air conditioner are all arranged in the housing, and the housing includes a base 13 and a cover set on the base 13 The upper cover (not shown in the figure), wherein, the base 13 is a rectangular plate-shaped structure, and the cover is a rectangular box-shaped structure, and the outdoor heat exchanger 111 and the compressor 112 are all arranged on the base 13 Above, the casing can be connected to the base 13 so as to effectively protect the heat exchanging elements therein. It should be noted that the present invention does not impose any restrictions on the specific structure and specific shape of the base 13 and the casing, and technicians can set it by themselves according to actual use requirements, as long as the outdoor heat exchanger 111 and the compressor 112 can be arranged on the base 13 and up.

As a preferred connection manner, both the outdoor heat exchanger 111 and the compressor 112 are connected to the base 13 in a screw connection manner. On the one hand, the screw connection has high connection strength, which can effectively ensure the reliability of the connection; on the other hand, the screw connection is more conducive to heat conduction, thereby further improving the defrosting effect. Of course, it can be understood that this connection method is only a preferred connection method, but it is not restrictive, and technicians can set it according to actual use requirements; for example, it can also be welding, clamping and so on. The change of this specific connection method does not deviate from the basic principle of the present invention, and belongs to the protection scope of the present invention.

Continue to refer to FIG. 1, as shown in FIG. 1, in this preferred embodiment, at least another part of the defrosting branch 12 is arranged on the base 13, that is, the surface of the outdoor heat exchanger 111 and the surface of the base 13 are provided with defrosting Frost Branch 12. Specifically, the defrosting branch 12 includes a first defrosting section 121 and a second defrosting section 122, wherein the first defrosting section 121 is a part of the defrosting branch 12 arranged on the surface of the outdoor heat exchanger 111, and the second The second defrosting segment 122 is a portion of the defrosting branch 12 disposed on the surface of the base 13 . It should be noted that the present invention does not impose any restrictions on the specific structures and connection methods of the first defrosting section 121 and the second defrosting section 122 , and technicians can set them according to actual use requirements.

As a preferred setting method, the first defrosting section 121 and the second defrosting section 122 are arranged in parallel, so that the defrosting branch 12 can selectively communicate with the first defrosting section 121 and the second defrosting section 121 according to actual use requirements. The defrosting section 122 can effectively adapt to different defrosting situations. Of course, this connection mode is not limiting, and technicians can set it according to actual use requirements; for example, the first defrosting section 121 and the second defrosting section 122 can also be arranged in series, which is not limiting .

Further, in this preferred embodiment, the outdoor heat exchanger 111 is an "L"-shaped plate heat exchanger. As a preferred arrangement of the first defrosting section 121, the first defrosting section 121 bends back and forth It is arranged on the surface of the outdoor heat exchanger 111 in a folded manner, and is preferably arranged on the inner surface of the outdoor heat exchanger 111, so as to effectively avoid unnecessary waste of the heat transported in the first defrosting section 121 by the outdoor temperature, and improve the efficiency of defrosting. frost efficiency. Further preferably, the first defrosting section 121 is bent back and forth along the length direction of the outdoor heat exchanger 111 so as to achieve a better defrosting effect. It should be noted that the above setting method is only a preferred setting method, but not a restrictive setting method, and technicians can also adjust the setting method according to actual use requirements. Such changes in the specific arrangement do not deviate from the basic principle of the present invention, as long as the first defrosting section 121 can bring heat to the outdoor heat exchanger 111 to realize defrosting, it shall belong to the protection scope of the present invention.

Furthermore, as a preferred arrangement of the second defrosting section 122, the second defrosting section 122 is arranged on the base 13 in a way of bending and surrounding, and is preferably arranged inside the base 13, so as to effectively avoid outdoor temperature. Unnecessary waste is caused to the heat transported in the second defrosting section 122, and the defrosting efficiency is improved. It should be noted that the above setting method is only a preferred setting method, but not a restrictive setting method, and technicians can also adjust the setting method according to actual use requirements. This modification of the specific arrangement does not deviate from the basic principle of the present invention, as long as the second defrosting section 122 can bring heat to the base 13 to realize defrosting, it should belong to the protection scope of the present invention.

In addition, the air conditioner of the present invention also includes a humidity sensor 101 and a controller. The six humidity sensors 101 are all arranged on the outdoor heat exchanger 111, and three of the humidity sensors 101 are located near the first defrosting section 121. The controller The controller can obtain the detection data of the six humidity sensors 101, and the controller can also control the operating state of the air conditioner, such as controlling the opening and closing state of the one-way valve 123 and the like. Those skilled in the art can understand that the present invention does not impose any restrictions on the specific structure and model of the controller, and the controller can be the original controller of the air conditioner, or it can be used to implement the present invention. The controller is set separately according to the control method, and the technician can set the structure and model of the controller according to the actual use requirements.

Referring next to Fig. 2, this figure is a flow chart of the main steps of the control method of the present invention. As shown in Figure 2, based on the air conditioner described in the above embodiments, the control method of the present invention mainly includes the following steps:

S1: Obtain the humidity near the outdoor heat exchanger;

S2: According to the humidity near the outdoor heat exchanger, control the on-off state of the defrosting branch.

In step S1, the controller can obtain the humidity near the outdoor heat exchanger 111, of course, the humidity here can be a single-point humidity, or the average value of multi-point humidity, this is not limiting, technical personnel You can set it yourself according to actual usage needs.

Next, in step S2, the controller can control the on-off state of the defrosting branch 12 according to the humidity near the outdoor heat exchanger 111 . It should be noted that the present invention does not impose any restrictions on the specific control method of controlling the on-off state of the defrosting branch 12 according to the humidity near the outdoor heat exchanger 111, and technicians can set it by themselves according to actual use requirements; for example, it can be When the humidity near the outdoor heat exchanger 111 satisfies the preset calculation formula, the defrosting branch 12 is controlled to connect, or when the humidity near the outdoor heat exchanger 111 meets the preset value range, the defrosting branch 12 is controlled to connect; another example , the communication between the first defrosting section 121 and the second defrosting section 122 can be controlled separately, or the communication between the first defrosting section 121 and the second defrosting section 122 can be controlled simultaneously.

Referring to Fig. 3 below, this figure is a flow chart of detailed steps of a preferred embodiment of the control method of the present invention. As shown in Figure 3, based on the air conditioner described in the above-mentioned preferred embodiment, the preferred embodiment of the control method of the present invention specifically includes the following steps:

S101: Obtain the humidity at six reference points on the outdoor heat exchanger;

S102: Calculate the average value of the humidity at the six reference points on the outdoor heat exchanger, and record it as the humidity near the outdoor heat exchanger;

S103: If the average value of the humidity at the six reference points on the outdoor heat exchanger is greater than the first preset humidity, control the connection of the defrosting branch;

S104: Obtain the humidity near the outdoor heat exchanger again when the defrosting branch is connected;

S105: If the acquired humidity near the outdoor heat exchanger is lower than the second preset humidity, control the defrosting branch to cut off after a preset time period.

In step S101, the controller can obtain the humidity at the six reference points through the six humidity sensors 101 provided on the outdoor heat exchanger 111. Of course, the specific setting positions and specific setting numbers of the reference points are not limiting , technicians can set it according to actual usage requirements; preferably, some reference points are set near the first defrosting section 121, so as to effectively improve the accuracy of the detection results.

Next, in step S102, calculate the average value of the humidity at the six reference points on the outdoor heat exchanger 111, and record it as the humidity near the outdoor heat exchanger 111, so as to control the on-off state of the defrosting branch 12 according to it , that is, correspondingly control the opening and closing state of the one-way valve 123 . In this preferred embodiment, the opening of the one-way valve 123 is controlled to communicate with the defrosting branch 12, and when the defrosting branch 12 is connected, refrigerant flows through both the first defrosting segment 121 and the second defrosting segment 122 .

Further, in step S103, if the average value of the humidity at the six reference points on the outdoor heat exchanger 111 is greater than the first preset humidity, control the communication of the defrosting branch 12, that is, control the one-way valve 123 Otherwise, keep the defrosting branch 12 in the cut-off state, that is, the one-way valve 123 remains in the closed state. It should be noted that the present invention does not impose any restrictions on the specific value of the first preset humidity, and technicians can set it according to actual use requirements; preferably, the first preset humidity is set to 67%, In order to maximize the accuracy of judgment.

Furthermore, in step S104, when the defrosting branch 12 is connected, the humidity near the outdoor heat exchanger 111 is obtained again, so that the controller can Selectively control the defrosting branch 12 to cut off. It should be noted that the humidity mentioned here can be the humidity of a single reference point, or the average value of the humidity of multiple reference points, which is not limiting, and technicians can set it according to actual use requirements.

Finally, in step S105, if the acquired humidity near the outdoor heat exchanger 111 is lower than the second preset humidity, after the preset time period, the one-way valve 123 is controlled to close, that is, the defrosting branch is controlled. Road 12 is cut off. Of course, although this preferred embodiment controls the cutoff of the defrosting branch 12 after the preset period of time has elapsed, this is only a preferred control method, so as to further reduce its humidity, thereby effectively reducing the risk of frosting. It should be noted that the present invention does not impose any restrictions on the specific values of the second preset humidity and the preset duration, and technicians can set them by themselves according to actual use requirements; as a preferred setting method, the The second preset humidity is lower than the first preset humidity, and the preset duration is set to 5 minutes.

In addition, it is further preferred that in step S104, the controller can obtain the humidity at multiple reference points on the outdoor heat exchanger 111, and select the humidity corresponding to the reference point with the highest humidity as the humidity near the outdoor heat exchanger 111. humidity. Next, in step S105, if the humidity corresponding to the reference point with the highest humidity is less than the second preset humidity, after the preset time period, the one-way valve 123 is controlled to close, that is, the defrosting branch 12 is controlled to be cut off, in order to minimize the risk of frost.

So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings, but those skilled in the art will easily understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of the present invention.

Claims

A control method for an air conditioner, characterized in that the outdoor unit of the air conditioner includes an outdoor heat exchange branch and a defrosting branch connected to the outdoor heat exchange branch,

A compressor and an outdoor heat exchanger are arranged on the outdoor heat exchange branch,

One end of the defrosting branch is connected to the exhaust end of the compressor, the other end of the defrosting branch is connected to the intake end of the compressor, and at least a part of the defrosting branch is provided with on the surface of the outdoor heat exchanger;

The control methods include:

Obtain the humidity near the outdoor heat exchanger;

The on-off state of the defrosting branch is controlled according to the humidity near the outdoor heat exchanger.
The control method according to claim 1, wherein the step of "obtaining the humidity near the outdoor heat exchanger" specifically includes:

obtaining humidity at multiple reference points on the outdoor heat exchanger;

Calculate the average value of the humidity at multiple reference points on the outdoor heat exchanger, and record it as the humidity near the outdoor heat exchanger;

The step of "controlling the on-off state of the defrosting branch according to the humidity near the outdoor heat exchanger" specifically includes:

The on-off state of the defrosting branch is controlled according to the average value of humidity at multiple reference points on the outdoor heat exchanger.
The control method according to claim 2, characterized in that, some of the plurality of reference points are located near the defrosting branch.
The control method according to claim 2, wherein the step of "controlling the on-off state of the defrosting branch according to the average value of the humidity at multiple reference points on the outdoor heat exchanger" is specific include:

If the average value of humidity at multiple reference points on the outdoor heat exchanger is greater than a first preset humidity, the defrosting branch is controlled to be connected.
The control method according to claim 4, wherein the first preset humidity is 67%.
The control method according to any one of claims 1 to 5, wherein the control method further comprises:

When the defrosting branch is connected, obtain the humidity near the outdoor heat exchanger again;

The defrosting branch is selectively controlled to be cut off according to the humidity near the outdoor heat exchanger obtained again.
The control method according to claim 6, wherein the step of "selectively controlling the cutting off of the defrosting branch according to the humidity near the outdoor heat exchanger obtained again" specifically includes:

If the acquired humidity near the outdoor heat exchanger is lower than the second preset humidity, the defrosting branch is controlled to be cut off.
The control method according to claim 7, wherein the step of "if the acquired humidity near the outdoor heat exchanger is lower than the second preset humidity, then controlling the defrosting branch to cut off" specifically includes :

If the acquired humidity near the outdoor heat exchanger is lower than the second preset humidity, the defrosting branch is controlled to be cut off after a preset time period.
The control method according to claim 8, wherein the preset duration is 5 minutes.
An air conditioner, characterized in that the air conditioner includes a controller capable of executing the control method according to any one of claims 1-9.