CN221005646U - Heat exchanger and air conditioner - Google Patents

Abstract

The application relates to the technical field of heat exchangers, and discloses a heat exchanger, which comprises: defrosting branch road, first bypass branch road, second bypass branch road, third bypass branch road, fourth bypass branch road, first heat transfer branch road, second heat transfer branch road and auto-change over device. The switching device is configured to switch on the first bypass branch and the fourth bypass branch when the heat exchanger is functioning as an evaporator, and to switch on the first bypass branch and the fourth bypass branch when the heat exchanger is functioning as a condenser. When the heat exchanger is used as an evaporator, the first heat exchange branch and the second heat exchange branch are in parallel connection, and when the heat exchanger is used as a condenser, the heat exchanger is in series connection. The heat exchanger has different refrigerant flowing paths under different working conditions, and is used as multiple branches in the case of an evaporator and fewer branches in the case of a condenser, so that variable flow diversion is realized. And when the evaporator is used as an evaporator, the heat exchange tube through which the evaporator flows can be defrosted under the action of the defrosting branch. The application also discloses an air conditioner.

Description

Heat exchanger and air conditioner

Technical Field

The application relates to the technical field of heat exchangers, in particular to a heat exchanger and an air conditioner.

Background

The air conditioner generally comprises a compressor, an outdoor heat exchanger, a throttling device and an indoor heat exchanger to form a refrigerant circulation loop. When the air conditioner operates in a refrigeration mode, the outdoor heat exchanger is used as a condenser; when the air conditioner operates in a heating mode, the outdoor heat exchanger is used as an evaporator; the flow directions of the refrigerants in the outdoor heat exchanger are opposite under different modes, and the flow paths of the refrigerants under different modes influence the performances of the outdoor heat exchanger and the air conditioner.

The related art discloses a heat exchanger, and the heat exchanger adopts shunt tubes or a shunt to carry out the design of shunting to make the refrigerant flow through more branch roads when the heat exchanger is as the evaporimeter, reduced refrigerant circulation system pressure drop, promoted the performance when the heat exchanger is as the evaporimeter.

In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:

When the heat exchanger is used as a condenser, the flow direction of the refrigerant is changed and flows reversely along the flow path when the heat exchanger is used as an evaporator, namely, the flow direction is opposite but the flow path is unchanged, and the refrigerant still flows through more branches, so that the heat exchange efficiency is reduced due to the fact that the heat exchanger is unfavorable for the rapid circulation requirement when the heat exchanger is used as the condenser.

It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the application and thus may include information that does not form the prior art that is already known to those of ordinary skill in the art.

Disclosure of utility model

The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview, and is intended to neither identify key/critical elements nor delineate the scope of such embodiments, but is intended as a prelude to the more detailed description that follows.

The embodiment of the disclosure provides a heat exchanger and an air conditioner, which solve the problem of how to change a flow passage when the heat exchanger is respectively used as an evaporator and a condenser so as to improve heat exchange efficiency.

In some embodiments, the heat exchanger comprises:

the first end of the defrosting branch is communicated with the first main pipeline, and the second end of the defrosting branch is communicated with the first flow dividing device; and a first throttling device is arranged on a communicating pipeline between the second end of the defrosting branch and the first diversion device;

The first bypass branch is communicated with the first flow dividing device at a first end and the second flow dividing device at a second end;

the first end of the first heat exchange branch is communicated with the second flow dividing device, and the second end of the first heat exchange branch is communicated with the third flow dividing device;

a second bypass branch having a first end connected to the first bypass device and a second end connected to the fourth bypass device;

The first end of the second heat exchange branch is communicated with the fourth flow dividing device, and the second end of the second heat exchange branch is communicated with the fifth flow dividing device;

A third bypass branch having a first end connected to the fifth flow splitting device and a second end connected to the third flow splitting device; the third bypass branch is provided with a first one-way valve, and the conducting direction of the first one-way valve is limited to flow from the fifth flow dividing device to the third flow dividing device;

a first end of the fourth bypass branch is communicated with the first bypass branch, and a second end of the fourth bypass branch is communicated with the fifth flow dividing device;

And a switching device configured to switch on the first bypass branch and switch off the fourth bypass branch when the heat exchanger is used as an evaporator, and switch on the first bypass branch and switch off the fourth bypass branch when the heat exchanger is used as a condenser.

Optionally, the switching device includes:

The second one-way valve is arranged on the first bypass branch; the conduction direction of the second check valve is defined as flowing from the first flow dividing device to the second flow dividing device;

The electromagnetic valve is arranged on the fourth bypass branch;

And the first end of the fourth bypass branch is communicated with the communicating pipeline of the second one-way valve and the second flow dividing device.

Optionally, in the case that the heat exchanger is used as an evaporator, the refrigerant enters the heat exchanger from the first main pipeline, and the electromagnetic valve is closed and the first throttling device throttles.

Optionally, when the heat exchanger is used as a condenser, the refrigerant enters the heat exchanger from the second main pipeline, the electromagnetic valve is opened, and the first throttling device is fully opened.

Optionally, the switching device includes:

The three-way reversing valve is arranged on the first bypass branch and comprises three communication ports; and the three communication ports are respectively communicated with the first flow dividing device, the second flow dividing device and the fifth flow dividing device.

Optionally, the number of first heat exchange branches is 12.

Optionally, the number of the second heat exchange branches is 6.

Optionally, the number of defrosting branches is 3.

In some embodiments, the air conditioner comprises a heat exchanger as described in any of the embodiments above.

Optionally, the air conditioner further comprises:

A fan assembly for driving air through the heat exchanger; when the heat exchanger is used as a condenser, the air flow direction is opposite to the refrigerant flow direction of the first heat exchange branch and the second heat exchange branch.

The heat exchanger and the air conditioner provided by the embodiment of the disclosure can realize the following technical effects:

When the heat exchanger is used as an evaporator, the first heat exchange branch and the second heat exchange branch are in parallel connection, and when the heat exchanger is used as a condenser, the heat exchanger is in series connection. The heat exchanger has different refrigerant flowing paths under different working conditions, and is used as multiple branches in the case of an evaporator and fewer branches in the case of a condenser, so that variable flow diversion is realized. And when the evaporator is used as an evaporator, the heat exchange tube through which the evaporator flows can be defrosted under the action of the defrosting branch.

The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.

Drawings

One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which like reference numerals refer to similar elements, and in which:

fig. 1 is a schematic diagram of a refrigerant circulation system of an air conditioner according to an embodiment of the present disclosure;

FIG. 2 is a schematic view of a refrigerant flow path when the heat exchanger provided in an embodiment of the present disclosure is used as an evaporator;

FIG. 3 is a schematic view of a refrigerant flow path when the heat exchanger provided in an embodiment of the present disclosure is used as a condenser;

fig. 4 is a schematic structural view of a three-way reversing valve provided in an embodiment of the present disclosure.

Reference numerals:

100: a first main line; 110: a first bypass branch; 120: a second bypass branch; 130: a third bypass branch; 140: a fourth bypass branch; 150: a first heat exchange branch; 160: a second heat exchange branch; 170: a defrosting branch; 180: a second main line;

200: a first throttle device; 201: a second throttle device; 210: a first shunt device; 220: a second flow dividing device; 230: a third shunt device; 240: a fourth shunt device; 250: a fifth shunt device; 260: a first one-way valve; 270: a second one-way valve; 280: an electromagnetic valve; 281: a three-way reversing valve;

300: a compressor; 310: an outdoor heat exchanger; 320: an indoor heat exchanger.

Detailed Description

So that the manner in which the features and techniques of the disclosed embodiments can be understood in more detail, a more particular description of the embodiments of the disclosure, briefly summarized below, may be had by reference to the appended drawings, which are not intended to be limiting of the embodiments of the disclosure. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may still be practiced without these details. In other instances, well-known structures and devices may be shown simplified in order to simplify the drawing.

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

In the embodiments of the present disclosure, the terms "upper", "lower", "inner", "middle", "outer", "front", "rear", and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are used primarily to better describe embodiments of the present disclosure and embodiments thereof and are not intended to limit the indicated device, element, or component to a particular orientation or to be constructed and operated in a particular orientation. Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in the embodiments of the present disclosure will be understood by those of ordinary skill in the art in view of the specific circumstances.

In addition, the terms "disposed," "connected," "secured" and "affixed" are to be construed broadly. For example, "connected" may be in a fixed connection, a removable connection, or a unitary construction; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements, or components. The specific meaning of the above terms in the embodiments of the present disclosure may be understood by those of ordinary skill in the art according to specific circumstances.

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

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

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

It should be noted that, without conflict, the embodiments of the present disclosure and features of the embodiments may be combined with each other.

As shown in conjunction with fig. 1-4, embodiments of the present disclosure provide a heat exchanger including a defrosting leg 170, a first bypass leg 110, a second bypass leg 120, a third bypass leg 130, a fourth bypass leg 140, a first heat exchange leg 150, a second heat exchange leg 160, and a switching device. Wherein, the first end of the defrosting branch 170 is communicated with the first main pipeline 100, and the second end thereof is communicated with the first diversion device 210; and, a first throttling device 200 is arranged on a communication pipeline between the second end of the defrosting branch 170 and the first diversion device 210; the first bypass 110 has a first end connected to the first splitting device 210 and a second end connected to the second splitting device 220; the first end of the first heat exchange branch 150 is communicated with the second flow dividing device 220, and the second end of the first heat exchange branch is communicated with the third flow dividing device 230; the first end of the second bypass branch 120 is communicated with the first diversion device 210, and the second end thereof is communicated with the fourth diversion device 240; the first end of the second heat exchange branch 160 is communicated with the fourth flow dividing device 240, and the second end thereof is communicated with the fifth flow dividing device 250; the first end of the third bypass branch 130 is connected to the fifth diverting device 250, and the second end is connected to the third diverting device 230; and, the third bypass branch 130 is provided with a first check valve 260, and the conducting direction of the first check valve 260 is defined to flow from the fifth flow dividing device 250 to the third flow dividing device 230; the first end of the fourth bypass 140 is connected to the first bypass 110, and the second end is connected to the fifth flow dividing device 250; the switching device is configured to switch the first bypass branch 110 on and the fourth bypass branch 140 off when the heat exchanger is acting as an evaporator, and to switch the first bypass branch 110 off and the fourth bypass branch 140 on when it is acting as a condenser.

In the present embodiment, when the heat exchanger is used as an evaporator, the first bypass 110 is turned on and the fourth bypass 140 is blocked under the action of the switching device. At this time, the refrigerant enters the defrosting branch 170 through the first main pipe 100, and can defrost the heat exchange pipe flowing through. The refrigerant continues to flow to the first flow dividing device 210 after being throttled by the first throttling device 200, and the refrigerant of the first flow dividing device 210 continues to divide into two paths for circulation: one via the first bypass branch 110 to the second flow splitting means 220 and the other via the second bypass branch 120 to the fourth flow splitting means 240. Then, the refrigerant of the second flow dividing device 220 continues to flow to the third flow dividing device 230 via the first heat exchanging branch 150, and the refrigerant of the fourth flow dividing device 240 flows to the fifth flow dividing device 250 via the second heat exchanging branch 160. Then, the refrigerant of the fifth bypass flow divider 250 continues to flow to the third flow divider 230 via the third bypass branch 130 and the first check valve 260. Finally, the refrigerant of the third flow splitting device 230 flows out of the heat exchanger through the second main pipe 180.

When the heat exchanger is used as a condenser, the first bypass branch 110 is blocked and the fourth bypass branch 140 is conducted under the action of the switching device. At this time, the refrigerant enters the third bypass device 230 through the second main pipe 180. The third bypass branch 130 is blocked by the unidirectional conduction of the first unidirectional valve 260. The refrigerant of the third splitting device 230 flows from the first heat exchange branch 150 to the second splitting device 220. The refrigerant of the second bypass branch 220 continues to flow to the fifth bypass branch 250 via the fourth bypass branch 140. The refrigerant of the fifth flow splitting device 250 continues to flow to the fourth flow splitting device 240 via the second heat exchange branch 160. The refrigerant of the fourth bypass branch 240 continues to flow to the first bypass 210 via the second bypass branch 120. The refrigerant of the first flow dividing device 210 continues to flow to the defrosting branch 170 through the first throttling device 200, and at this time, the first throttling device 200 is fully opened and is not throttled. Finally, the refrigerant of the defrosting branch 170 flows out of the heat exchanger through the first main pipeline 100.

It can be seen that the first heat exchange leg 150 and the second heat exchange leg 160 are in parallel relationship when the heat exchanger is used as an evaporator and in series relationship when the heat exchanger is used as a condenser. The heat exchanger has different refrigerant flowing paths under different working conditions, and is used as multiple branches in the case of an evaporator and fewer branches in the case of a condenser, so that variable flow diversion is realized. And, when acting as an evaporator, the evaporator can defrost the heat exchange tube flowing through under the action of the defrosting branch 170.

Alternatively, as shown in fig. 2 and 3, the switching means includes a second check valve 270 and a solenoid valve 280. Wherein the second check valve 270 is disposed in the first bypass branch 110; the direction of conduction of the second check valve 270 is defined as flowing from the first flow splitting device 210 to the second flow splitting device 220; the electromagnetic valve 280 is disposed in the fourth bypass 140; and, the first end of the fourth bypass 140 is connected to the connection line between the second check valve 270 and the second flow divider 220.

In this embodiment, the refrigerant can only flow from the first flow dividing device 210 to the second flow dividing device 220 under the action of the second check valve 270. Thus, the heat exchanger is turned on as the first bypass 110 in the evaporator and is blocked as the first bypass 110 in the condenser. And, by controlling the switch of the electromagnetic valve 280, the on-off of the fourth bypass branch 140 can be controlled.

Alternatively, in the case of a heat exchanger as an evaporator, the refrigerant enters the heat exchanger from the first main line 100, and the solenoid valve 280 is closed, and the first throttling device 200 throttles.

In this embodiment, the fourth bypass branch 140 may be blocked by controlling the solenoid valve 280 to close. When the first throttling device 200 plays a throttling role, the refrigerant before throttling flows through the defrosting branch 170 to perform defrosting role, and the refrigerant after throttling flows through the first heat exchange branch 150 and the second heat exchange branch 160 to perform normal heat exchange.

Alternatively, in the case of the heat exchanger functioning as a condenser, the refrigerant enters the heat exchanger through the second main pipe 180, and the solenoid valve 280 is opened and the first throttling device 200 is fully opened.

In the present embodiment, the fourth bypass 140 is turned on by controlling the solenoid valve 280 to open, and the first throttling device 200 is fully opened and not throttled. When the heat exchanger is applied to an air conditioner as the outdoor heat exchanger 310, the second throttling device 201 is opened under the cooling condition, so that the second throttling device 201 plays a throttling role between the outdoor heat exchanger 310 and the indoor heat exchanger 320.

Alternatively, as shown in fig. 4, the switching means comprises a three-way reversing valve 281. The three-way reversing valve 281 is disposed in the first bypass branch 110 and includes three communication ports; and, the three communication ports are respectively communicated with the first flow dividing device 210, the second flow dividing device 220 and the fifth flow dividing device 250.

In the present embodiment, the three communication ports are referred to as a first communication port, a second communication port, and a third communication port, respectively. Wherein, the first communication port is communicated with the first flow dividing device 210, the second communication port is communicated with the second flow dividing device 220, and the third communication port is communicated with the fifth flow dividing device 250. When the heat exchanger is used as an evaporator, the first communication port is controlled to be communicated with the second communication port, and the third communication port is controlled to be closed, so that the first bypass branch 110 is conducted, and the fourth bypass branch 140 is blocked; as shown in fig. 4, when the heat exchanger is used as a condenser, the second communication port and the third communication port are controlled to be communicated, and the first communication port is controlled to be closed, so that the fourth bypass branch 140 is conducted, and the first bypass branch 110 is blocked.

Optionally, the first heat exchange branch 150, the second heat exchange branch 160 and the defrosting branch 170 are sequentially arranged from top to bottom.

Alternatively, the number of defrosting branches 170 is 1 or more.

Illustratively, the heat exchange tubes of the heat exchanger are arranged in 3 rows, and a defrosting branch 170 is arranged at the lowest end of each row. The first ends of the 3 defrosting branches 170 are all communicated with the first main pipeline 100, and the second ends of the 3 defrosting branches 170 are all communicated with the first diversion device 210.

Optionally, the number of second heat exchange branches 160 is greater than the number of defrosting branches 170.

Illustratively, as shown in fig. 2 and 3, the number of second heat exchange branches 160 is 6 and the number of defrosting branches 170 is 3. The first ends of the 6 second heat exchange branches 160 are all communicated with the fourth shunting device 240,6, and the second ends of the 6 second heat exchange branches 160 are all communicated with the fifth shunting device 250.

Still another exemplary, the number of the second heat exchanging branches 160 is 2, and the number of the defrosting branches 170 is 1. The first ends of the 2 second heat exchange branches 160 are all communicated with the fourth flow dividing device 240,2, and the second ends of the 2 second heat exchange branches 160 are all communicated with the fifth flow dividing device 250.

Optionally, the number of first heat exchange branches 150 is greater than the number of second heat exchange branches 160.

Illustratively, as shown in fig. 2 and 3, the number of first heat exchange branches 150 is 12, and the number of second heat exchange branches 160 is 6. First ends of the 12 first heat exchange branches 150 are all communicated with the second flow dividing device 220, and second ends of the 12 second heat exchange branches 160 are all communicated with the third flow dividing device 230. The first ends of the 6 second heat exchange branches 160 are all communicated with the fourth shunting device 240,6, and the second ends of the 6 second heat exchange branches 160 are all communicated with the fifth shunting device 250.

Still another exemplary, the number of the first heat exchange branches 150 is 4, and the number of the second heat exchange branches 160 is 2. The first ends of the 4 first heat exchange branches 150 are all communicated with the second ends of the second heat exchange branches 160 of the second flow dividing device 220,4 and are all communicated with the third flow dividing device 230. The first ends of the 2 second heat exchange branches 160 are all communicated with the fourth flow dividing device 240,2, and the second ends of the 2 second heat exchange branches 160 are all communicated with the fifth flow dividing device 250.

Optionally, the number of the first heat exchange branches 150 is N1, and the number of the second heat exchange branches 160 is N2; wherein, N1/N2 is less than or equal to 1.5 and less than or equal to 2.5.

Illustratively, 12 first heat exchange branches 150 and 6 second heat exchange branches 160, then:

1.5≤N1/N2＝2≤2.5。

Still another exemplary embodiment, the number of the first heat exchanging branches 150 is 4, and the number of the second heat exchanging branches 160 is 2, and then:

1.5≤N1/N2＝2≤2.5。

Optionally, the number of defrosting branches 170 is N3, and the number of rows of heat exchange tubes of the heat exchanger is M; wherein N3 is more than or equal to 0.7M and less than or equal to 3M.

Illustratively, the number of defrosting branches 170 is 3, and the number of rows of heat exchange tubes of the heat exchanger is 3, then:

0.7M＝2.1≤N3＝3≤3M＝9。

Optionally, the first bypass branch 110 has an inner diameter D1, and the second bypass branch 120 has an inner diameter D2; wherein D1 is more than or equal to D2.

Optionally, the number of the first heat exchange branches 150 is N1, and the number of the second heat exchange branches 160 is N2;

Wherein N1 is more than N2, and N1/N2 is more than or equal to 0.7 (D1/D2) and less than or equal to 1.5 (N1/N2). In this way, the heat exchange effect of the heat exchanger can be improved by limiting the numerical relationship.

The embodiment of the disclosure further provides an air conditioner, as shown in fig. 1, a refrigerant circulation system of the air conditioner is at least composed of a compressor 300, an outdoor heat exchanger 310, a second throttling device 201 and an indoor heat exchanger 320, wherein the indoor heat exchanger 320 and/or the outdoor heat exchanger 310 are heat exchangers with variable flow diversion functions described in any of the embodiments above.

Alternatively, the outdoor heat exchanger 310 is the heat exchanger having the variable flow dividing function described above. When the air conditioner operates in the heating mode, the outdoor heat exchanger 310 serves as an evaporator, the first throttling device 200 throttles, and the second throttling device 201 does not throttle. The refrigerant of the compressor 300 flows to the indoor heat exchanger 320, and the refrigerant of the indoor heat exchanger 320 flows to the outdoor heat exchanger 310 through the second throttling device 201. At this time, the refrigerant enters the defrosting branch 170 from the first main pipeline 100, and the refrigerant performs a defrosting function in the defrosting branch 170. The refrigerant in the defrosting branch 170 is throttled by the first throttle device 200 and then flows to the first bypass device 210. The refrigerant of the first splitting device 210 flows to the third splitting device 230 through the plurality of first heat exchanging branches 150 and the plurality of second heat exchanging branches 160 connected in parallel. The refrigerant of the third flow dividing means 230 flows out of the outdoor heat exchanger 310 through the second main pipe 180. Finally, the refrigerant of the outdoor heat exchanger 310 flows back to the compressor 300 to be recompressed, thereby completing the refrigerant cycle in the heating mode.

When the air conditioner operates in the cooling mode, the outdoor heat exchanger 310 serves as a condenser, the first throttling device 200 is not throttled, and the second throttling device 201 is throttled. The refrigerant of the compressor 300 flows to the outdoor heat exchanger 310 through the four-way valve, and at this time, the refrigerant enters the third split device 230 through the second main pipe 180. The refrigerant of the third splitting device 230 flows to the first splitting device 210 sequentially through the first heat exchange branch 150 and the second heat exchange branch 160 which are connected in series. The refrigerant of the first flow dividing device 210 flows out of the outdoor heat exchanger 310 through the first throttling device 200, the defrosting branch 170, and the first main pipe 100 in this order. The refrigerant of the outdoor heat exchanger 310 is throttled by the second throttle device 201 and then flows to the indoor heat exchanger 320. Finally, the refrigerant of the indoor heat exchanger 320 flows back to the compressor 300 to be re-compressed, thereby completing the refrigerant cycle in the cooling mode.

Optionally, the air conditioner further comprises a fan assembly for driving air to flow through the heat exchanger; as shown in fig. 3, when the heat exchanger is used as a condenser, the air flow direction is opposite to the refrigerant flow direction of the first heat exchange branch 150 and the second heat exchange branch 160.

In the present embodiment, in the case where the outdoor heat exchanger 310 is the heat exchanger having the variable flow dividing function as described above, the fan assembly includes an outdoor fan. The outdoor fan is disposed at one side of the outdoor heat exchanger 310 for driving the air flow through the outdoor heat exchanger 310. When the outdoor heat exchanger 310 is used as a condenser, the air flow direction is opposite to the refrigerant flow direction of the first heat exchange branch 150 and the second heat exchange branch 160 by the outdoor fan. Therefore, the refrigerant and the air exchange heat in a countercurrent way, and the heat exchange efficiency can be effectively improved.

The above description and the drawings illustrate embodiments of the disclosure sufficiently to enable those skilled in the art to practice them. Other embodiments may include structural and other modifications. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in, or substituted for, those of others. The embodiments of the present disclosure are not limited to the structures that have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (10)

1. A heat exchanger, comprising:

A defrosting branch (170) with a first end communicated with the first main pipeline (100) and a second end communicated with the first diversion device (210); a first throttling device (200) is arranged on a communicating pipe between the second end of the defrosting branch (170) and the first diversion device (210);

A first bypass branch (110) having a first end connected to the first flow dividing means (210) and a second end connected to the second flow dividing means (220);

A first heat exchange branch (150) with a first end communicated with the second flow dividing device (220) and a second end communicated with the third flow dividing device (230);

a second bypass branch (120) having a first end in communication with the first flow splitting device (210) and a second end in communication with the fourth flow splitting device (240);

a second heat exchange branch (160) with a first end communicated with the fourth flow dividing device (240) and a second end communicated with the fifth flow dividing device (250);

A third bypass branch (130) having a first end in communication with the fifth flow diversion device (250) and a second end in communication with the third flow diversion device (230); the third bypass branch (130) is provided with a first check valve (260), and the conduction direction of the first check valve (260) is limited to flow from the fifth flow dividing device (250) to the third flow dividing device (230);

A fourth bypass branch (140) having a first end connected to the first bypass branch (110) and a second end connected to the fifth bypass means (250);

And switching means configured to switch on the first bypass branch (110) and to switch off the fourth bypass branch (140) when the heat exchanger is used as an evaporator, and to switch on the first bypass branch (110) and the fourth bypass branch (140) when the heat exchanger is used as a condenser.

2. The heat exchanger of claim 1, wherein the switching device comprises:

A second check valve (270) disposed in the first bypass branch (110); the direction of conduction of the second one-way valve (270) is defined as flowing from the first flow dividing means (210) to the second flow dividing means (220);

A solenoid valve (280) provided in the fourth bypass passage (140);

And, the first end of the fourth bypass branch (140) is communicated with a communicating pipeline of the second one-way valve (270) and the second flow dividing device (220).

3. A heat exchanger according to claim 2 wherein,

When the heat exchanger is used as an evaporator, the refrigerant enters the heat exchanger from the first main pipeline (100), the electromagnetic valve (280) is closed, and the first throttling device (200) throttles.

4. A heat exchanger according to claim 2 wherein,

When the heat exchanger is used as a condenser, the refrigerant enters the heat exchanger from the second main pipeline (180), the electromagnetic valve (280) is opened, and the first throttling device (200) is fully opened.

5. The heat exchanger of claim 1, wherein the switching device comprises:

The three-way reversing valve (281) is arranged on the first bypass branch (110) and comprises three communication ports; and, three communication ports are respectively communicated with the first flow dividing device (210), the second flow dividing device (220) and the fifth flow dividing device (250).

6. A heat exchanger according to any one of claims 1 to 5 wherein,

The number of the first heat exchange branches (150) is 12.

7. A heat exchanger according to any one of claims 1 to 5 wherein,

The number of the second heat exchange branches (160) is 6.

8. A heat exchanger according to any one of claims 1 to 5 wherein,

The number of defrosting branches (170) is 3.

9. An air conditioner comprising the heat exchanger according to any one of claims 1 to 8.

10. The air conditioner as set forth in claim 9, further comprising:

A fan assembly for driving air through the heat exchanger; when the heat exchanger is used as a condenser, the air flow direction is opposite to the refrigerant flow direction of the first heat exchange branch (150) and the second heat exchange branch (160).