CN219243739U - Heat exchanger and air conditioner - Google Patents

Abstract

The application relates to the technical field of refrigeration equipment and discloses a heat exchanger, which comprises a first main pipeline, a first heat exchange passage, a second heat exchange passage, a third heat exchange passage, a second main pipeline, a flow dividing element and a one-way valve. Through the cooperation of check valve and flow dividing element to when the operation heating mode, the refrigerant flow direction in the heat exchanger is opposite with the refrigeration mode and the flow path is different, and then improves the heat exchange efficiency of heat exchanger under different modes. Meanwhile, the application also discloses an air conditioner.

Description

Heat exchanger and air conditioner

Technical Field

The present application relates to the technical field of refrigeration equipment, for example, to a heat exchanger and an air conditioner.

Background

Air conditioning is a commonly used air temperature conditioning device. The existing air conditioner mainly has a split structure, namely an indoor unit and an outdoor unit, and the indoor unit and the outdoor unit are connected through a refrigerant circulation loop. The indoor unit comprises an indoor heat exchanger, and the outdoor unit comprises an outdoor heat exchanger. Because the indoor heat exchanger and the outdoor heat exchanger are key components of the air conditioner for indoor and outdoor heat exchange, the heat exchange efficiency of the indoor heat exchanger and the outdoor heat exchanger directly influences the refrigerating or heating effect of the air conditioner.

Most of the existing air-conditioning products have a dual-function mode of refrigeration/heating, the air-conditioning can operate the refrigeration function to discharge heat in the indoor environment to the outdoor environment in high-temperature weather in summer and operate the heating function to guide heat in the outdoor environment to the indoor environment in severe cold weather in winter, so that the indoor environment temperature requirements of users in different weather and climate conditions are met.

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:

for the air conditioner with the function to be switched, the flowing directions of the refrigerating mode and the heating mode are opposite, but the flowing path is unchanged, so that the problem of reducing the heat exchange efficiency of the air conditioner is generated.

Disclosure of Invention

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

The embodiment of the disclosure provides a heat exchanger and an air conditioner, which realize different flow paths in a refrigeration mode and a heating mode by using a one-way valve and a flow dividing element, so as to improve the heat exchange efficiency of the air conditioner in different modes.

The embodiment of the disclosure provides a heat exchanger, which comprises a first main pipeline, a first heat exchange passage, a second heat exchange passage, a third heat exchange passage, a second main pipeline, a flow dividing element and a one-way valve. The first end of the first heat exchange passage is connected with the first main pipeline, and the second end is connected with the main supercooling pipeline, the collecting pipeline and the first supercooling pipeline. The first end of the second heat exchange passage is connected with the first main pipeline, and the second end is connected with the main supercooling pipeline, the collecting pipeline and the second supercooling pipeline. The first end of the third heat exchange passage is connected with the first main pipeline, and the second end is connected with the main supercooling pipeline, the collecting pipeline and the third supercooling pipeline. Second main pipeline and main and the supercooling pipeline is connected. The flow dividing element comprises a first end communicated with the collecting pipeline, the first supercooling pipeline, the second supercooling pipeline and the third supercooling pipeline respectively, and a second end connected with the second main pipeline. The check valve is arranged on the collecting pipeline, and the conducting direction is limited from the second main pipeline to the first main pipeline.

In some embodiments, the header includes an upper tube section and a lower tube section. The first heat exchange passage, the second heat exchange passage and the third heat exchange passage are connected with the upper pipe section, the flow dividing element is connected with the lower pipe section, and the one-way valve is arranged on the lower pipe section.

In some embodiments, the first heat exchange path includes at least two first heat exchange branches disposed in parallel. The second heat exchange passage comprises at least two second heat exchange branches which are arranged in parallel. The third heat exchange passage comprises at least two third heat exchange branches which are arranged in parallel.

In some embodiments, the second heat exchange passage is located in a lower portion of the first heat exchange passage, and the third heat exchange passage is located in a lower portion of the second heat exchange passage.

In some embodiments, the first heat exchange branch and the second heat exchange branch comprise the same number of heat exchange tubes, and the second heat exchange branch and the third heat exchange branch comprise the same number of heat exchange tubes.

In some embodiments, the diameter of the first subcooling line is the same as the diameter of the second subcooling line and the diameter of the second subcooling line is the same as the diameter of the third subcooling line.

In some embodiments, the diameter of the header line is greater than or equal to the diameter of the first heat exchange passage. The diameter of the collecting pipeline is larger than or equal to that of the second heat exchange passage. The diameter of the collecting pipeline is larger than or equal to that of the third heat exchange passage.

The embodiment of the disclosure also provides an air conditioner, which is provided with a refrigerant circulation loop comprising an indoor heat exchanger, an outdoor heat exchanger, a compressor and a four-way valve. Wherein the indoor heat exchanger and/or the outdoor heat exchanger are/is the heat exchanger.

In some embodiments, when the outdoor heat exchanger is a heat exchanger, the first main line is in communication with the compressor and the second main line is in communication with the indoor heat exchanger.

In some embodiments, when the indoor heat exchanger is a heat exchanger, the first main line is in communication with the compressor and the second main line is in communication with the outdoor heat exchanger.

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

the first end of a first heat exchange passage in the heat exchanger is connected with a first main pipeline, and the second end of the first heat exchange passage is connected with a main supercooling pipeline, a collecting pipeline and a first supercooling pipeline; the first end of the second heat exchange passage is connected with the first main pipeline, and the second end of the second heat exchange passage is connected with the main supercooling pipeline, the collecting pipeline and the second supercooling pipeline; the first end of the third heat exchange passage is connected with the first main pipeline, and the second end of the third heat exchange passage is connected with the main supercooling pipeline, the collecting pipeline and the third supercooling pipeline; the second main pipeline is connected with the main supercooling pipeline; the flow dividing element comprises a first end communicated with the flow collecting pipeline, the first supercooling pipeline, the second supercooling pipeline and the third supercooling pipeline respectively, and a second end connected with the second main pipeline; the check valve is arranged on the collecting pipeline, and the conducting direction is limited from the second main pipeline to the first main pipeline. Therefore, when the air conditioner runs in a heating or refrigerating mode, the flow directions of refrigerants in the heat exchanger are opposite and the flow paths are different, so that the heat exchange efficiency of the air conditioner in different modes is improved.

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 view of a heat exchanger provided in an embodiment of the present disclosure;

FIG. 2 is a schematic view of another heat exchanger provided by an embodiment of the present disclosure;

FIG. 3 is a schematic view of a portion of a heat exchanger provided in an embodiment of the present disclosure;

FIG. 4 is a schematic diagram of a refrigerant flow of a heat exchanger according to an embodiment of the present disclosure;

fig. 5 is a schematic refrigerant flow diagram of another heat exchanger according to an embodiment of the present disclosure.

Reference numerals:

101: a first main pipe; 102: a second main line; 201: a first heat exchange passage; 202: a second heat exchange path; 203: a third heat exchange path; 301: a first subcooling line; 302: a second subcooling line; 303: a third subcooling line; 304: a total subcooling line; 4: a collecting pipeline; 5: a one-way valve; 6: a shunt element.

Detailed Description

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

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

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.

The air conditioner comprises an indoor unit and an outdoor unit, wherein the indoor unit is provided with an indoor heat exchanger, an indoor fan and the like, and can be used for realizing the functions of heat exchange and the like by matching with a refrigerant and an indoor environment; the outdoor unit is provided with an outdoor heat exchanger, an outdoor fan, a compressor and the like, and can be used for realizing the functions of heat exchange and the like by matching with a refrigerant and an outdoor environment.

The embodiment of the disclosure provides a heat exchanger and an air conditioner, which are matched with a one-way valve 5 and a flow dividing element 6, so that when the air conditioner operates in a heating mode, the flow direction of a refrigerant in the heat exchanger is opposite to that of the refrigerant in the refrigerating mode, and the flow paths are different, and the heat exchange efficiency of the air conditioner in different modes is improved.

As shown in fig. 1 to 5, the embodiment of the present disclosure provides a heat exchanger including a first main line 101, a first heat exchange passage 201, a second heat exchange passage 202, a third heat exchange passage 203, a second main line 102, a flow dividing element 6, and a check valve 5. The first heat exchange path 201 has a first end connected to the first main line 101, and a second end connected to the main subcooling line 304, the collecting line 4, and the first subcooling line 301. The first end of the second heat exchange passage 202 is connected to the first main line 101, and the second end is connected to the main subcooling line 304, the collecting line 4, and the second subcooling line 302. The third heat exchange path 203 has a first end connected to the first main line 101, and a second end connected to the main subcooling line 304, the collecting line 4, and the third subcooling line 303. The second main line 102 is connected to a main subcooling line 304. The flow dividing element 6 includes a first end communicating with the collecting line 4, the first subcooling line 301, the second subcooling line 302 and the third subcooling line 303, respectively, and a second end connected to the second main line 102, as shown in fig. 3. The check valve 5 is provided in the collecting line 4, and the conduction direction is defined from the second main line 102 to the first main line 101.

It will be appreciated that, as shown in fig. 4, when the refrigerant flow direction in the heat exchanger is from the first main pipe 101 to the second main pipe 102, the blocking of the check valve 5 prevents the refrigerant in the first heat exchange passage 201, the second heat exchange passage 202 and the third heat exchange passage 203 from flowing to the second main pipe 102 through the collecting pipe 4. As shown in fig. 5, when the flow direction of the refrigerant in the heat exchanger is from the second main line 102 to the first main line 101, the check valve 5 is turned on, and the refrigerant in the second main line 102 can flow to the first heat exchange passage 201, the second heat exchange passage 202 and the third heat exchange passage 203 through the collecting line 4.

As shown in fig. 1 and 2, specifically, when the above-described heat exchanger is used as an outdoor heat exchanger and is in the cooling mode, the refrigerant flows from the first header line 101 to the second header line 102. The refrigerant in the first main line 101 is split and flows into the first heat exchange passage 201, the second heat exchange passage 202, and the third heat exchange passage 203. The refrigerant in the first heat exchange path 201 flows into the first subcooling line 301 and the total subcooling line 304 after being split. The refrigerant in the first supercooling line 301 flows into the flow dividing element 6, and flows into the second main line 102 after being collected. The refrigerant in the second heat exchange path 202 is split and flows into the second subcooling circuit 302 and the total subcooling circuit 304. The refrigerant in the second supercooling line 302 flows into the flow dividing element 6, and flows into the second main line 102 after being collected. Similarly, the refrigerant in the third heat exchange path 203 is split and flows into the third subcooling line 303 and the total subcooling line 304. The refrigerant in the third supercooling line 303 flows into the flow dividing element 6, and flows into the second main line 102 after being collected. The refrigerant flowing into the first heat exchange passage 201, the second heat exchange passage 202 and the third heat exchange passage 203 through the total supercooling pipeline 304 is converged, flows to the lower side of the third heat exchange passage 203 for supercooling, and flows into the second total pipeline 102. In this way, the first heat exchange passage 201, the second heat exchange passage 202 and the third heat exchange passage 203 are respectively provided with the total supercooling pipeline 304, and simultaneously, separate supercooling pipelines are respectively arranged, so that the heat exchange energy and defrosting effect of the heat exchanger are improved.

When the heat exchanger is used as an outdoor heat exchanger and is in a heating mode, the refrigerant flows from the second main line 102 to the first main line 101. The refrigerant in the second main pipe 102 is split and flows to the splitting element 6 and the main supercooling pipe 304. After being split, the refrigerant in the main subcooling line 304 flows into the first heat exchange passage 201, the second heat exchange passage 202, and the third heat exchange passage 203, respectively, and then flows into the first main line 101. After the refrigerant in the flow dividing element 6 is divided, the refrigerant flows to the header 4, the first subcooling circuit 301, the second subcooling circuit 302, and the third subcooling circuit 303. The refrigerant in the first subcooling pipe 301, the second subcooling pipe 302 and the third subcooling pipe 303 flows into the first heat exchange passage 201, the second heat exchange passage 202 and the third heat exchange passage 203 respectively, and at the same time, the refrigerant in the collecting pipe 4 flows into the first heat exchange passage 201, the second heat exchange passage 202 and the third heat exchange passage 203 after being split. Then, the refrigerant in the first heat exchange path 201, the second heat exchange path 202, and the third heat exchange path 203 flows into the first header line 101. In this way, the refrigerant in the header pipe 4 and the header supercooling pipe 304 flows into the first heat exchange passage 201, the second heat exchange passage 202 and the third heat exchange passage 203, so that the flow speed of the refrigerant in the first heat exchange passage 201, the second heat exchange passage 202 and the third heat exchange passage 203 is increased, the pressure loss is reduced, and the heating capacity of the heat exchanger is improved.

As shown in fig. 3, in some embodiments, header 4 includes an upper pipe section and a lower pipe section. Wherein the first heat exchange passage 201, the second heat exchange passage 202 and the third heat exchange passage 203 are connected with the upper pipe section, the flow dividing element 6 is connected with the lower pipe section, and the check valve 5 is arranged at the lower pipe section.

Specifically, the check valve 5 is disposed at a lower pipe section of the collecting pipe 4, and the conducting direction is defined to flow from the flow dividing element 6 to an upper pipe section, so as to satisfy different flow paths when the heat exchanger is in different modes.

It will be appreciated that the above-described non-return valve 5 may be replaced by other valve bodies, such as solenoid valves, etc., which enable a non-return flow of fluid.

The header pipe 4 is divided up and down into an upper pipe section at the upper part and a lower pipe section at the lower part. It will be appreciated that the upper and lower tube sections are in a top-to-bottom relationship with respect to each other and that the length relationship of the upper and lower tube sections is not overly limited.

As shown in fig. 1 and 2, in some embodiments, the first heat exchange path 201 includes at least two first heat exchange branches disposed in parallel. The second heat exchange path 202 includes at least two second heat exchange branches arranged in parallel. The third heat exchange path 203 comprises at least two third heat exchange branches arranged in parallel.

Specifically, the first heat exchange path 201, the second heat exchange path 202 and the third heat exchange path 203 are respectively provided with two heat exchange branches in parallel, so as to increase the number of heat exchange tubes in the heat exchanger, and further improve the heat exchange capacity and defrosting effect of the heat exchanger. Meanwhile, the number of heat exchange branches arranged in the first heat exchange passage 201, the second heat exchange passage 202 and the third heat exchange passage 203 is the same.

As shown in fig. 1 and 2, in some embodiments, the second heat exchange passage 202 is located in a lower portion of the first heat exchange passage 201, and the third heat exchange passage 203 is located in a lower portion of the second heat exchange passage 202.

It can be appreciated that the first heat exchange passage 201, the second heat exchange passage 202 and the third heat exchange passage 203 are arranged side by side, which is beneficial to improving the heat exchange efficiency of the heat exchanger.

In some embodiments, the first heat exchange branch and the second heat exchange branch comprise the same number of heat exchange tubes, and the second heat exchange branch and the third heat exchange branch comprise the same number of heat exchange tubes.

Specifically, the first heat exchange branch comprises at least one heat exchange tube, and the number of the heat exchange tubes contained in the second heat exchange branch and the third heat exchange branch is the same as that of the heat exchange tubes contained in the first heat exchange branch, so that refrigerants distributed to the first heat exchange branch, the second heat exchange branch and the third heat exchange branch are more uniform.

In some embodiments, the diameter of the first subcooling line 301 is the same as the diameter of the second subcooling line 302, and the diameter of the second subcooling line 302 is the same as the diameter of the third subcooling line 303.

Specifically, the first subcooling pipeline 301, the second subcooling pipeline 302, and the third subcooling pipeline 303 adopt the same structural design, which is beneficial to the same refrigerant flowing into the first subcooling pipeline 301, the second subcooling pipeline 302, and the third subcooling pipeline 303.

In some embodiments, the diameter of the header line 4 is greater than or equal to the diameter of the first heat exchange passage 201. The diameter of the collecting pipe 4 is greater than or equal to the diameter of the second heat exchanging path 202. The diameter of the collecting pipe 4 is greater than or equal to the diameter of the third heat exchange passage 203.

For example, the diameter of the header pipe 4 is greater than or equal to 2/3 times, 2 times, or 3 times the diameters of the first heat exchange path 201, the second heat exchange path 202, and the third heat exchange path 203. In this way, when the refrigerant flows from the header pipe 4 into the first heat exchange passage 201, the second heat exchange passage 202, and the third heat exchange passage 203, the occurrence of a shortage of the refrigerant flow rate can be avoided.

In the above embodiment, the heat exchange tubes included in the first heat exchange path 201, the second heat exchange path 202, and the third heat exchange path 203 are of the same structural design. For example, the heat exchange pipes included in the first heat exchange channel 201, the second heat exchange channel 202 and the third heat exchange channel 203 have the same pipe diameter, the same pipe wall thickness, the same curvature and length at the bent pipe, and the like, so that the refrigerant flows more uniformly in the heat exchanger, and the condition of unstable refrigerant pressure and flow rate caused by the structural change of the heat exchange pipes is avoided.

The embodiment of the disclosure also provides an air conditioner, which is provided with a refrigerant circulation loop comprising an indoor heat exchanger, an outdoor heat exchanger, a compressor and a four-way valve. Wherein the indoor heat exchanger and/or the outdoor heat exchanger are/is the heat exchanger.

In some embodiments, when the outdoor heat exchanger is the heat exchanger described above, the first main line 101 communicates with the compressor and the second main line 102 communicates with the indoor heat exchanger.

Specifically, when the above heat exchanger is used as an outdoor heat exchanger of an air conditioner, the first main pipe 101 of the heat exchanger communicates with the compressor, and the second main pipe 102 communicates with the indoor heat exchanger. Therefore, under the cooling condition, the high-temperature refrigerant discharged from the compressor flows into the first main pipe 101, flows into the second main pipe 102 according to the flow path, and flows into the indoor heat exchanger.

It can be understood that the path length and time of heat exchange between the high-temperature refrigerant and the outdoor environment are prolonged, so that the high-temperature refrigerant can reach lower temperature after flowing through the outdoor heat exchanger, and further the refrigerating performance is improved.

In some embodiments, when the indoor heat exchanger is the heat exchanger described above, the first main line 101 communicates with the compressor and the second main line 102 communicates with the outdoor heat exchanger.

Specifically, when the above heat exchanger is used as an indoor heat exchanger of an air conditioner, the first main pipe 101 of the heat exchanger communicates with the compressor, and the second main pipe 102 communicates with the outdoor heat exchanger. Therefore, under the heating condition, the high-temperature refrigerant discharged from the compressor flows into the first main pipe 101, flows into the second main pipe 102 according to the flow path, and flows into the outdoor heat exchanger.

It can be understood that the path length and the time for heat exchange between the high-temperature refrigerant and the indoor environment are prolonged, so that the heat of the high-temperature refrigerant can be transferred to the indoor environment in a large quantity, and the heating performance is further improved.

In some embodiments, when the heat exchanger is used as an indoor heat exchanger under a cooling condition, the first main pipeline 101 is a pipeline for flowing out as a refrigerant, and the second main pipeline 102 is a pipeline for flowing in as a refrigerant; when the heat exchanger is used as an indoor heat exchanger under a heating condition, the first main pipeline 101 is a pipeline into which a refrigerant flows, and the second main pipeline 102 is a pipeline from which the refrigerant flows.

In some embodiments, when the heat exchanger is used as an outdoor heat exchanger under a cooling condition, the first main pipeline 101 is a pipeline into which the refrigerant flows, and the second main pipeline 102 is a pipeline out of which the refrigerant flows; when the heat exchanger is used as an outdoor heat exchanger under the heating condition, the first main pipeline 101 is a pipeline for flowing out the refrigerant, and the second main pipeline 102 is a pipeline for flowing in the refrigerant.

By adopting the air conditioner of the heat exchanger, when the air conditioner operates in a refrigerating working condition or a heating working condition, the refrigerant can be conveyed in different flow directions and flow paths, so that the refrigerant can fully exchange heat downwards during refrigerating flow, and meanwhile, the problem of pressure loss caused by overlong flow paths during heating can be avoided downwards, and therefore, the performance requirements of the heat exchanger in different working modes can be simultaneously ensured.

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 first main pipe;

the first heat exchange passage is connected with the first main pipeline at a first end, and is connected with the main supercooling pipeline, the collecting pipeline and the first supercooling pipeline at a second end;

the first end of the second heat exchange passage is connected with the first main pipeline, and the second end of the second heat exchange passage is connected with the main supercooling pipeline, the collecting pipeline and the second supercooling pipeline;

the first end of the third heat exchange passage is connected with the first main pipeline, and the second end of the third heat exchange passage is connected with the main supercooling pipeline, the collecting pipeline and the third supercooling pipeline;

the second main pipeline is connected with the main supercooling pipeline;

a flow dividing element which is connected with the collecting pipeline, the first supercooling pipeline, the second supercooling pipeline and the third supercooling pipeline respectively

A first end of the passage, and a second end connected to the second main conduit; and, a step of, in the first embodiment,

the check valve is arranged on the collecting pipeline, and the conducting direction is limited from the second main pipeline to the first main pipeline.

2. A heat exchanger according to claim 1 wherein,

the collecting pipeline comprises an upper pipe section and a lower pipe section,

the first heat exchange passage, the second heat exchange passage and the third heat exchange passage are connected with the upper pipe section, the flow dividing element is connected with the lower pipe section, and the one-way valve is arranged on the lower pipe section.

3. A heat exchanger according to claim 2 wherein,

the first heat exchange passage comprises at least two first heat exchange branches which are arranged in parallel;

the second heat exchange passage comprises at least two second heat exchange branches which are arranged in parallel; and/or the number of the groups of groups,

the third heat exchange passage comprises at least two third heat exchange branches which are arranged in parallel.

4. A heat exchanger according to claim 3 wherein,

the second heat exchange passage is positioned at the lower part of the first heat exchange passage; and, in addition, the method comprises the steps of,

the third heat exchange passage is positioned at the lower part of the second heat exchange passage.

5. A heat exchanger according to claim 3 wherein,

the number of the heat exchange tubes contained in the first heat exchange branch and the second heat exchange branch is the same; and, in addition, the method comprises the steps of,

the number of the heat exchange tubes contained in the second heat exchange branch and the third heat exchange branch is the same.

6. A heat exchanger according to claim 1 wherein,

the diameter of the first supercooling pipeline is the same as that of the second supercooling pipeline; and, in addition, the method comprises the steps of,

the diameter of the second supercooling pipeline is the same as that of the third supercooling pipeline.

7. A heat exchanger according to claim 1 wherein,

the diameter of the collecting pipeline is larger than or equal to that of the first heat exchange passage;

the diameter of the collecting pipeline is larger than or equal to the diameter of the second heat exchange passage; and, in addition, the method comprises the steps of,

the diameter of the collecting pipeline is larger than or equal to that of the third heat exchange passage.

8. An air conditioner is provided with a refrigerant circulation loop comprising an indoor heat exchanger, an outdoor heat exchanger, a compressor and a four-way valve, and is characterized in that,

the indoor heat exchanger and/or the outdoor heat exchanger is a heat exchanger according to any one of claims 1 to 7.

9. The air conditioner of claim 8, wherein the air conditioner further comprises a fan,

when the outdoor heat exchanger is the heat exchanger, the first main pipeline is communicated with the compressor, and the second main pipeline is communicated with the indoor heat exchanger.

10. An air conditioner according to claim 8 or 9, wherein,

when the indoor heat exchanger is the heat exchanger, the first main pipeline is communicated with the compressor, and the second main pipeline is communicated with the outdoor heat exchanger.

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