Defrosting device of air conditioner and air conditioner

Abstract

The utility model relates to a defrosting device of an air conditioner and the air conditioner. The defrosting device comprises an outdoor heat exchanger, a switching device and a defrosting branch. The outdoor heat exchanger comprises a plurality of circulating branches which are connected in parallel, at least two first circulating branches in the circulating branches are located in different defrosting areas, and each first circulating branch is connected with the switching device; the switching device is also connected with the defrosting branch, so that at least one first circulating branch can be conducted with the defrosting branch; the defrosting branch is used for being connected with a compressor of the air conditioner so that a refrigerant medium can be controlled to flow into a first circulation branch communicated with the defrosting branch under driving of the compressor, and a defrosting area where the first circulation branch is located can be defrosted. Therefore, the purpose of defrosting different defrosting areas in a targeted mode is achieved, the defrosting effect is improved, the heating performance of the air conditioner and the comfort experience of a user are improved, and electric energy is saved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of air conditioners, and in particular to a defrosting device of an air conditioner and the air conditioner. Background Art

[0002] When an air conditioner is operating in heating mode, frost often forms on the outdoor unit. This frost reduces the outdoor heat exchange capacity, ultimately affecting the air conditioner's heating performance. Therefore, proper defrosting control is essential for maintaining continuous and efficient heating.

[0003] Currently, the mainstream defrost control strategies in the industry include reverse cycle defrost, hot gas bypass defrost, and hot gas direct defrost. These defrost control strategies all share one common characteristic: when executing the defrost strategy, the entire outdoor heat exchanger of the air conditioner participates in the defrost process. In actual operation, the surface of the air conditioner's outdoor heat exchanger is not uniformly frosted, resulting in different defrosting heat requirements in different areas of the outdoor heat exchanger.

[0004] However, the traditional defrost control strategy treats the outdoor heat exchanger as a whole without considering the frost layer distribution of the outdoor heat exchanger. From a heat perspective, for the thin frost area of ​​the outdoor heat exchanger, supplying too much heat will lead to heat waste, while for the thick frost area of ​​the outdoor heat exchanger, insufficient heat supply will lead to incomplete defrosting, resulting in residual frost on the surface of the outdoor heat exchanger. The repetitive incomplete defrosting process will not only cause the air conditioner to fail to achieve optimal heating performance, affecting the user's comfort experience, but also lead to waste of electricity. Utility Model Content

[0005] In order to overcome the problems existing in the related art, the present disclosure provides a defrosting device for an air conditioner and an air conditioner.

[0006] According to a first aspect of an embodiment of the present disclosure, there is provided a defrosting device for an air conditioner, comprising:

[0007] An outdoor heat exchanger, a switching device and a defrost branch; the outdoor heat exchanger includes multiple parallel circulation branches, at least two first circulation branches among the multiple circulation branches are located in different defrost areas, and each of the first circulation branches is connected to the switching device; the switching device is also connected to the defrost branch, and can make at least one first circulation branch connected to the defrost branch; the defrost branch is used to be connected to the compressor of the air conditioner, so as to control the refrigerant medium to flow into the first circulation branch connected thereto under the drive of the compressor, so as to defrost the defrost area where the first circulation branch is located.

[0008] According to a second aspect of an embodiment of the present disclosure, an air conditioner is provided, comprising: a heating branch, a compressor and a defrost device as provided in the first aspect of the embodiment of the present disclosure; the heating branch comprises an indoor heat exchanger; the compressor is respectively connected to the heating branch and the defrost branch, and is used to drive the refrigerant medium to flow in the heating branch and the defrost branch; the switching device is also connected to the heating branch, and can switch the target branch that is connected to the first circulation branch, and the target branch comprises the heating branch or the defrost branch.

[0009] By adopting the above technical solution, the outdoor heat exchanger is divided into multiple defrost areas, and at least one first circulation branch is provided in each defrost area, and the switching device is respectively connected to the first circulation branch and the defrost branch, so that at least one first circulation branch can be connected to the defrost branch, and then the refrigerant medium in the defrost branch is used to defrost the defrost area where the first circulation branch connected to it is located. In this way, the purpose of targeted defrosting of different defrost areas is achieved, the defrost effect is improved, the heating performance of the air conditioner and the user's comfort experience are enhanced, and electricity is saved.

[0010] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0012] Figure 1 The figure is a schematic diagram of a defrosting device of an air conditioner according to an exemplary embodiment.

[0013] Figure 2 The figure is a schematic diagram of another defrosting device of an air conditioner according to an exemplary embodiment.

[0014] Figure 3 is a schematic diagram of an air conditioner according to an exemplary embodiment. DETAILED DESCRIPTION

[0015] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

[0016] It should be noted that all actions of acquiring signals, information or data in the present disclosure are carried out in compliance with the corresponding data protection laws and policies of the country where they are located and with the authorization given by the owner of the corresponding device.

[0017] As mentioned in the background technology, if the outdoor heat exchanger is treated as a whole without considering the frost layer distribution of the outdoor heat exchanger and defrosting is performed in an indiscriminate manner, the defrosting efficiency will be low, affecting the heating performance of the air conditioner, thereby affecting the user's comfort experience and resulting in waste of electricity.

[0018] In view of this, the present disclosure provides a defrost device for an air conditioner and an air conditioner, which divides the outdoor heat exchanger into defrost areas according to the distribution characteristics of the outdoor heat exchanger, and then defrosts different defrost areas in a targeted manner to improve the defrost effect, thereby improving the heating performance of the air conditioner, improving the user's comfort experience, and saving electricity.

[0019] Figure 1 FIG. 1 is a schematic diagram of a defrosting device for an air conditioner according to an exemplary embodiment. Figure 1 As shown, the defrost device of the air conditioner may include an outdoor heat exchanger 101, a switching device 102 and a defrost branch 103. The outdoor heat exchanger 101 may include a plurality of parallel circulation branches, at least two first circulation branches 1012 of the plurality of circulation branches are located in different defrost areas, and each first circulation branch 1012 is connected to the switching device 102. The switching device 102 is also connected to the defrost branch 103, and can make at least one first circulation branch 1012 conductive with the defrost branch 103. The defrost branch 103 is used to be connected to the compressor 200 of the air conditioner, so as to control the flow of the refrigerant medium into the first circulation branch 1012 conductive thereto under the drive of the compressor 200, so as to defrost the defrost area where the first circulation branch 1012 is located. For example, in the present disclosure, the air conditioner may be an air source heat pump air conditioner.

[0020] exist Figure 1 In the description, an outdoor heat exchanger is divided into three defrost areas, there are three defrost areas, and there are also three first circulation branches. In actual applications, the circulation branches can be more or fewer, and the first circulation branches can be only part of the circulation branches. For example, the outdoor heat exchanger can be further divided into three defrost areas, four circulation branches are set, and the first circulation branches are three of the four circulation branches. It should be understood that each defrost area is provided with at least one first circulation branch. Users can design the defrost areas, circulation branches and first circulation branches according to actual needs and the size, shape and installation location of the outdoor heat exchanger, and the present disclosure does not make specific limitations on this.

[0021] In the present disclosure, the outdoor heat exchanger 101 may be a fin-tube heat exchanger, and a plurality of circulation branches are sequentially distributed from top to bottom along the outdoor heat exchanger 101. Figure 1 As shown, the outdoor heat exchanger is divided into three defrost areas, which are respectively marked as the first defrost area A, the second defrost area B and the third defrost area C, and a first circulation branch 1012 is provided in each defrost area.

[0022] The switching device 102 can be a plurality of two-way valves or three-way valves, etc. The switching device 102 is connected to the first circulation branch 1012 and the defrost branch 103 respectively, and can connect the first circulation branch 1012 located in the defrost area requiring defrost with the defrost branch 103.

[0023] Furthermore, a refrigerant flows through the defrost branch 103, and the compressor 200 can control the refrigerant to flow into the first circulation branch 1012 in communication therewith, thereby achieving the purpose of using the refrigerant to defrost the defrost region where the first circulation branch 1012 is located. It should be understood that the temperature of the refrigerant flowing through the defrost branch 103 is relatively high. Therefore, when the relatively high temperature refrigerant flows into the first circulation branch 1012, the defrost region where the first circulation branch 1012 is located can be defrosted.

[0024] For example, assuming that the switching device 102 includes three two-way valves, each two-way valve is connected to a first circulation branch 1012 and a defrost branch 103. Assuming that the defrost area that needs to be defrosted is defrost area C, the two-way valve connected to the first circulation branch 1012 located in defrost area C can connect the first circulation branch 1012 with the defrost branch 103. Subsequently, the refrigerant flowing in the defrost branch 103 flows into the first circulation branch 1012 located in the defrost area C under the drive of the compressor 200, thereby achieving the purpose of defrosting the defrost area C.

[0025] By adopting the above technical solution, the outdoor heat exchanger is divided into multiple defrost areas, and at least one first circulation branch is provided in each defrost area, and the switching device is respectively connected to the first circulation branch and the defrost branch, so that at least one first circulation branch can be connected to the defrost branch, and then the refrigerant medium in the defrost branch is used to defrost the defrost area where the first circulation branch connected to it is located. In this way, the purpose of targeted defrosting of different defrost areas is achieved, the defrost effect is improved, the heating performance of the air conditioner and the user's comfort experience are enhanced, and electricity is saved.

[0026] Figure 2 FIG. 1 is a schematic diagram of another defrosting device of an air conditioner according to an exemplary embodiment. Figure 2As shown, the defrost branch 103 further includes a first flow regulating device 1031, wherein the first flow regulating device 1031 can be a flow valve or an electronic expansion valve, etc. The first flow regulating device 1031 is provided on the defrost branch 103 and is used to control the flow of the refrigerant medium in the defrost branch 103, thereby regulating the flow of the refrigerant medium flowing into the first circulation branch 1012.

[0027] For example, considering that in actual applications, defrosted liquid in the upper defrost area will flow into the lower defrost area, resulting in a higher degree of frost in the lower defrost area than in the upper defrost area, the amount of refrigerant required in defrost area C must be higher than that required in defrost area A. For example, assuming that the first circulation branch 1012 connected to the defrost branch 103 is the first circulation branch 1012 located in defrost area C, the opening degree of the first flow regulating device 1031 is a, and the first circulation branch 1012 connected to the defrost branch 103 is the first circulation branch 1012 located in defrost area A, the opening degree of the first flow regulating device 1031 is b, then a is greater than b. In this way, a larger flow rate of refrigerant can be used for defrosting in defrost areas with a higher degree of frost, while a smaller flow rate of refrigerant can be used for defrosting in defrost areas with a lower degree of frost.

[0028] In this way, by setting the first flow regulating device 1031 on the defrost branch 103, the flow of the refrigerant medium in the defrost branch can be adjusted, and then the flow of the refrigerant medium flowing into the first circulation branch located in different defrost areas can be adjusted. Then, defrosting can be carried out for different defrost areas using refrigerants of different flow rates, further improving the flexibility and effect of defrosting and avoiding waste of refrigerant.

[0029] In addition, in the present disclosure, whether each defrost area is frosted can be determined based on the temperature of each defrost area, thereby determining the first circulation branch that needs to be connected to the defrost branch. Figure 2 As shown, the outdoor heat exchanger 101 may further include a temperature acquisition device, which is used to detect the temperature of each first circulation branch 1012, and the temperature is used to determine the first circulation branch that is connected to the defrost branch.

[0030] The temperature acquisition device may include one or more temperature acquisition components. The temperature acquisition component may be an external tube temperature sensor or other device capable of acquiring temperature, which is not specifically limited in the present disclosure.

[0031] For example, if the temperature collection device includes one temperature collection component, then the one temperature collection component can collect the temperature of each first circulation branch 1012. For another example, if the temperature collection device includes multiple temperature collection components 1013, for example, the number of included temperature collection components 1013 is the same as the number of first circulation branches, that is, one temperature collection component 1013 is provided on each first circulation branch, and each temperature collection component 1013 is used to collect the temperature of the first circulation branch where it is located.

[0032] In addition, the temperature collection component can be set at any position on the first circulation branch, for example, it can be set at the middle position on the first circulation branch, or at the starting position along the flow direction of the refrigerant medium on the first circulation branch, or at the end position along the flow direction of the refrigerant medium on the first circulation branch. However, in order to ensure the accuracy of the measured temperature, the temperature collection component is usually set at the end position along the flow direction of the refrigerant medium on the first circulation branch. Therefore, Figure 2 As shown, for each first circulation branch, at least one temperature collecting component is provided at the end of the first circulation branch along the flow direction of the refrigerant medium.

[0033] In one embodiment, after the temperature acquisition device acquires the temperature of each first circulation branch, it outputs the temperature, allowing the user to determine the first circulation branch that is connected to the defrost branch and manually control the switching device to connect the first circulation branch to the defrost branch. However, since air conditioners are often installed at high locations and the above-mentioned components of the air conditioner are all contained within the air conditioner housing, manual control is not convenient for the user.

[0034] Therefore, in another embodiment, the above-mentioned components in the defrost device can be automatically controlled to perform defrosting. For example, the defrost device can further include a controller, each connected to the temperature acquisition device and the switching device, configured to obtain the temperature of each first circulation branch from the temperature detection device and determine a target circulation branch to be connected to the defrost branch based on the temperature. Furthermore, after determining the target circulation branch to be connected to the defrost branch, the controller is further configured to control the switching device to connect the target circulation branch to the defrost branch.

[0035] The specific implementation method of the controller determining the target circulation branch connected to the defrost branch according to the temperature will be described below and will not be repeated here.

[0036] The present disclosure also provides an air conditioner. Figure 3 FIG. 1 is a schematic diagram of an air conditioner according to an exemplary embodiment. Figure 3 As shown, the air conditioner 10 may include the defrosting device, the compressor 200 and the heating branch 300 as described above.

[0037] The heating branch 300 includes an indoor heat exchanger 301. The compressor 200 is connected to the heating branch 300 and the defrost branch 103, respectively, to drive the refrigerant through the heating branch 300 and the defrost branch 103. The switching device 102 is also connected to the heating branch 300. Specifically, the switching device 102 is connected to the first circulation branch 1012, the defrost branch 103, and the heating branch 300. The switching device 102 can switch the target branch to be connected to the first circulation branch 1012, which can be the heating branch or the defrost branch.

[0038] For example, Figure 3 As shown, each first circulation branch can be connected to the defrost branch 103 and the heating branch 300 respectively through the switching device 102, and the switching device 102 can control whether each first circulation branch is connected to the defrost branch 103 or the heating branch 300.

[0039] For example, switching device 102 can connect the first circulation branch in defrost area C to defrost branch 103, and connect the first circulation branches in defrost areas A and B to heating branch 300. In this way, the air conditioner can simultaneously defrost defrost area C and provide heating. This allows the air conditioner to defrost the outdoor heat exchanger through the defrost branch while also defrosting the air through the indoor heat exchanger and then to the outdoor heat exchanger through the heating branch, further improving defrosting efficiency.

[0040] In the present disclosure, to ensure that the switching device 102 is connected to the first circulation branch 1012, the defrost branch 103, and the heating branch 300, the switching device 102 may include a three-way valve. That is, the switching device 102 may include three-way valves corresponding one to each of the first circulation branches. In other words, the number of first circulation branches matches the number of three-way valves included in the switching device 102.

[0041] like Figure 3 As shown, for each three-way valve, the first valve port of the three-way valve is connected to the starting end of the first circulation branch 1012, the second valve port of the three-way valve is connected to the heating branch 300, and the third valve port of the three-way valve is connected to the defrost branch 103. The starting end of the first circulation branch is the starting end of the first circulation branch along the direction of refrigerant medium flow. For example, Figure 3 As shown, the direction of flow of the refrigerant medium in the first circulation branch is from right to left, and the starting end of the first circulation branch is the rightmost end of the first circulation branch.

[0042] like Figure 3As shown, it is assumed that the three-way valve on the first circulation branch 1012 located in the defrost area A is three-way valve ①, and the first valve port of three-way valve ① is recorded as 1-1, the second valve port is recorded as 1-2, and the third valve port is recorded as 1-3. It is assumed that the three-way valve on the first circulation branch 1012 located in the defrost area B is three-way valve ②, and the first valve port of three-way valve ② is recorded as 2-1, the second valve port is recorded as 2-2, and the third valve port is recorded as 2-3. It is assumed that the three-way valve on the first circulation branch 1012 located in the defrost area C is three-way valve ③, and the first valve port of three-way valve ③ is recorded as 3-1, the second valve port is recorded as 3-2, and the third valve port is recorded as 3-3.

[0043] When the first circulation branch 1012 needs to be connected to the defrost branch 103, the first valve port and the third valve port of the three-way valve on the first circulation branch 1012 are controlled to be closed to achieve connection between the first circulation branch 1012 and the defrost branch 103. When the first circulation branch 1012 needs to be connected to the heating branch 300, the first valve port and the second valve port of the three-way valve on the first circulation branch 1012 are controlled to be closed to achieve connection between the first circulation branch 1012 and the heating branch 300.

[0044] For example, assuming that the first circulation branch 1012 in defrost area C needs to be connected to the defrost branch 103, the first valve port 3-1 and the third valve port 3-3 of the three-way valve ③ are controlled to be closed. assuming that the first circulation branch 1012 in defrost area A and the first circulation branch 1012 in defrost area B need to be connected to the heating branch 300, the first valve port 1-1 and the third valve port 1-3 of the three-way valve ① are controlled to be closed, and the first valve port 2-1 and the third valve port 2-3 of the three-way valve ② are controlled to be closed.

[0045] In addition, considering that the probability of frost forming in the uppermost area of ​​the outdoor heat exchanger is higher, the demand for defrosting is correspondingly higher, and the probability of frost forming in some areas is lower, that is, some areas of the outdoor heat exchanger do not need to be connected to the defrost branch 103. Therefore, in one embodiment, the other circulation branches except the first circulation branch in the multiple circulation branches are connected to the heating branch.

[0046] In this embodiment, the first circulation branch is a partial branch of the circulation branch, that is, in addition to the first circulation branch that can be connected to the defrost branch, the circulation branch also includes other circulation branches that are not connected to the defrost branch, and the other circulation branches only need to be always connected to the heating branch, so that when the air conditioner operates in heating mode, heat can be exchanged with the outdoor through the other circulation branches.

[0047] In addition, if Figure 3As shown, the heating branch 300 may also include a second flow regulating device 302 connected in series with the indoor heat exchanger 301. The second flow regulating device 302 is used to regulate the flow of the refrigerant medium in the heating branch 300, and then regulate the flow of the refrigerant medium flowing into the outdoor heat exchanger or the circulation branch connected thereto.

[0048] For example, the second flow regulating device 302 may be a throttling device, such as an electronic expansion valve.

[0049] In this way, the opening of the second flow regulating device can be adjusted according to the parameters in the heating mode, such as the heating target temperature, the heating target wind speed, etc., to meet the user's heating needs.

[0050] In the foregoing detailed description, reference is made to the accompanying drawings, which illustrate, by way of illustration, specific aspects of the present disclosure in which it may be practiced. In this regard, terms indicating directions or expressing positional relationships, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc., may be used with reference to the orientation of the figures being described. Since the components of the described devices may be positioned in a plurality of different orientations, the directional terms may be used for illustrative purposes rather than restrictive. It should be understood that other aspects may be utilized and structural or logical changes may be made without departing from the concepts of the present disclosure. Therefore, the following detailed description should not be taken in a limiting sense.

[0051] It should be understood that, unless otherwise specifically noted, the features of the various embodiments of the present disclosure described herein may be combined with each other. As used herein, the term "and / or" includes any one of the relevant listed items and any combination of any two or more thereof; similarly, "at least one of" includes any one of the relevant listed items and any combination of any two or more thereof.

[0052] It should be understood that, unless otherwise expressly specified or limited, the terms "join," "attach," "install," "connect," "connect," "fix," etc. used in the embodiments of the present disclosure should be understood in a broad sense. For example, they can be fixedly connected, detachably connected, or integrated; they can be mechanically connected, electrically connected, or communicable with each other; they can be directly connected, or indirectly connected through an intermediate medium, and they can be internally connected between two elements or an interactive relationship between two elements, unless otherwise expressly limited. For those skilled in the art, the specific meanings of the above terms in this article can be understood according to specific circumstances.

[0053] In addition, the term "over" as used in reference to a component, element, or material layer being formed "over" or located "over" a surface may be used herein to mean that the component, element, or material layer is "indirectly" positioned (e.g., placed, formed, deposited, etc.) on the surface such that one or more additional components, elements, or layers are disposed between the surface and the component, element, or material layer. However, the term "over" as used in reference to a component, element, or material layer being formed "over" or located "over" a surface may alternatively have a specific meaning: the component, element, or material layer is "directly" positioned (e.g., placed, formed, deposited, etc.) on the surface, e.g., in direct contact with the surface.

[0054] Although terms such as "first", "second" and "third" may be used herein to describe various components, parts, regions, layers or sections, these components, parts, regions, layers or sections are not limited to these terms. On the contrary, these terms are only used to distinguish one component, part, region, layer or section from another component, part, region, layer or section. Therefore, without departing from the teachings of each example, the first component, part, region, layer or section mentioned in the examples described herein may also be referred to as the second component, part, region, layer or section. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" can explicitly or implicitly include at least one such feature. In the description herein, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise clearly and specifically defined.

[0055] It should be understood that spatially relative terms such as "above," "upper," "below," and "lower" are used herein to describe the relationship of one element to another element shown in the figures. In addition to the orientation depicted in the figures, such spatially relative terms are intended to encompass different orientations of the device in use or operation. For example, if the device in the figures is flipped, an element described as being "above" or "upper" relative to another element will be "below" or "lower" relative to the other element. Thus, the term "above" encompasses both above and below orientations, depending on the spatial orientation of the device. The device may be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatially relative terms used herein should be interpreted accordingly.

[0056] Furthermore, the word "exemplary" is used herein to mean serving as an example, instance, or illustration. Any aspect or design described herein as "exemplary" is not necessarily to be construed as advantageous over other aspects or designs. Rather, the use of the word exemplary is intended to present concepts in a concrete manner. As used herein, the term "or" is intended to mean an inclusive "or" rather than an exclusive "or." That is, unless otherwise specified or clear from the context, "X applies to A or B" is intended to mean any of the natural inclusive permutations. That is, if X applies to A; X applies to B; or X applies to both A and B, then "X applies to A or B" satisfies any of the aforementioned instances. Furthermore, the articles "a" and "an," as used in this application and the appended claims, are generally understood to mean "one or more," unless otherwise specified or clear from the context to refer to the singular form.

[0057] Likewise, although the present disclosure has been shown and described with respect to one or more implementations, equivalent variations and modifications will occur to those skilled in the art after reading and understanding the specification and drawings. The present disclosure includes all such modifications and variations and is limited only by the scope of the claims. In particular, with respect to the various functions performed by the components described above (e.g., elements, resources, etc.), unless otherwise indicated, the terms used to describe such components are intended to correspond to any component (functionally equivalent) that performs the specific functions of the described components, even if structurally not equivalent to the disclosed structures. In addition, although specific features of the present disclosure may have been disclosed with respect to only one of several implementations, such features may be combined with one or more other features of other implementations as may be desired and beneficial for any given or specific application. In addition, with respect to the terms "including," "having," "having," "having," or variations thereof used in the specific embodiments or claims, such terms are intended to be inclusive in a manner similar to the term "comprising."

[0058] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing what is disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

[0059] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes can be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A defrost device for an air conditioner, characterized in that: The defrost device comprises: an outdoor heat exchanger, a switching device and a defrost branch; The outdoor heat exchanger includes a plurality of parallel circulation branches, at least two first circulation branches among the plurality of circulation branches are located in different defrosting areas, and each of the first circulation branches is connected to the switching device; The switching device is also connected to the defrost branch, and is capable of connecting at least one first circulation branch to the defrost branch; The defrost branch is used to be connected to the compressor of the air conditioner, so as to control the refrigerant medium to flow into the first circulation branch connected thereto under the drive of the compressor, so as to defrost the defrost area where the first circulation branch is located.

2. The defrosting device according to claim 1, characterized in that: The defrost branch includes a first flow regulating device; The first flow regulating device is used to regulate the flow of the refrigerant medium flowing into the defrost branch.

3. The defrosting device according to claim 1 or 2, characterized in that: The outdoor heat exchanger also includes a temperature collection device; The temperature acquisition device is used to detect the temperature of each first circulation branch, and the temperature is used to determine the first circulation branch that is connected to the defrost branch.

4. The defrosting device according to claim 3, characterized in that: The temperature detection device includes a plurality of temperature collection components; At least one temperature collecting component is provided at the end of each of the first circulation branches along the flow direction of the refrigerant medium.

5. The defrosting device according to claim 3, characterized in that: The defrosting device also includes a controller; The controller is connected to the temperature acquisition device and the switching device respectively, and is used to obtain the temperature of each first circulation branch from the temperature detection device, and determine the target circulation branch connected to the defrost branch according to the temperature; The controller is further configured to control the switching device to connect the target circulation branch to the defrost branch after determining the target circulation branch connected to the defrost branch.

6. The defrost device according to any one of claims 1 to 5, characterized in that: The plurality of circulation branches are distributed in sequence from top to bottom along the outdoor heat exchanger.

7. An air conditioner, characterized in that: The air conditioner comprises: a heating branch, a compressor and a defrost device according to any one of claims 1 to 6; The heating branch includes an indoor heat exchanger; The compressor is connected to the heating branch and the defrost branch respectively, and is used to drive the refrigerant medium to flow in the heating branch and the defrost branch; The switching device is also connected to the heating branch, and can switch a target branch that is connected to the first circulation branch, where the target branch includes the heating branch or the defrost branch.

8. The air conditioner according to claim 7, characterized in that The switching device includes: a three-way valve corresponding to each of the first circulation branches; For each of the three-way valves, the first valve port of the three-way valve is connected to the starting end of the first circulation branch, the second valve port of the three-way valve is connected to the heating branch, and the third valve port of the three-way valve is connected to the defrost branch. The starting end of the first circulation branch is the starting end along the flow direction of the refrigerant medium on the first circulation branch.

9. The air conditioner according to claim 7, characterized in that The other circulation branches except the first circulation branch among the plurality of circulation branches are connected to the heating branch.

10. The air conditioner according to any one of claims 7 to 9, characterized in that: The heating branch further includes a second flow regulating device connected in series with the indoor heat exchanger; The second flow regulating device is used to regulate the flow of the refrigerant medium in the heating branch.

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