Heat exchanger and air conditioning system

Abstract

The present application generally relates to the field of air conditioning technology, and specifically, to a heat exchanger and an air conditioning system, wherein the heat exchanger includes a header and a first heat exchange row group, a second heat exchange row group and a third heat exchange row group respectively connected to the header, the first heat exchange row group is connected to a liquid refrigerant inlet pipe, the second heat exchange row group and the third heat exchange row group are respectively connected to a gaseous refrigerant inlet pipe, when the heat exchanger is cooling, the gas-liquid two-phase refrigerant enters the first heat exchange row group through the liquid refrigerant inlet pipe, the refrigerant enters the header after heat exchange in the first heat exchange row group, and then flows out of the header from the second heat exchange row group and the third heat exchange row group, the number of pipes for the refrigerant to enter and exit the header forms a state of less inlet and more outlet, thereby reducing the pressure drop of the heat exchanger, and the header in this solution reduces the number of branches of the header compared to a heat exchanger with multiple rows connected in parallel, simplifies the processing technology of the header, and reduces the cost of the heat exchanger.

Description

Technical Field

[0001] The present application generally relates to the field of air conditioning technology, and in particular, to a heat exchanger and an air conditioning system. Background Art

[0002] Microchannel heat exchanger is a new type of high-efficiency heat exchanger with the advantages of high heat transfer efficiency, small size, light weight, and small filling volume. Traditional single-row microchannel heat exchangers cannot be used in large-capacity and high-efficiency air conditioners due to the limitation of heat exchange area. In order to meet the required capacity requirements in a smaller space, multi-row microchannel heat exchangers can be used. The series heat exchanger that connects multiple rows of heat exchangers in series or in parallel can effectively improve the heat exchange capacity of the heat exchanger and meet the use of large-capacity air conditioners. However, for larger-sized multi-row parallel heat exchangers, many branches need to be set in the liquid inlet pipe, resulting in complex processing and assembly processes and high costs. Summary of the invention

[0003] A series of simplified concepts are introduced in the Summary of the Invention, which will be further described in detail in the Detailed Description of the Invention. The Summary of the Application does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0004] In order to solve the above technical problems, the main purpose of this application is to provide a heat exchanger and an air-conditioning system.

[0005] In order to achieve the above invention objectives, this application adopts the following technical solutions:

[0006] A heat exchanger comprises a header and a first heat exchange row group, a second heat exchange row group and a third heat exchange row group respectively connected to the header;

[0007] The first heat exchange row group is connected to a liquid refrigerant inlet pipe, and the second heat exchange row group and the third heat exchange row group are respectively connected to a gaseous refrigerant inlet pipe.

[0008] Furthermore, in some embodiments of the present solution, the first heat exchange row group is located between the second heat exchange row group and the third heat exchange row group.

[0009] Furthermore, in some embodiments of the present solution, the second heat exchange row group is located between the first heat exchange row group and the third heat exchange row group.

[0010] Furthermore, in some embodiments of the present solution, the manifold is provided with a first flow limiting structure for limiting the flow of refrigerant flowing to the third heat exchange row group, and the first flow limiting structure is provided with a first flow channel for the circulation of refrigerant.

[0011] Furthermore, in some embodiments of the present solution, a second flow limiting structure for limiting the flow of refrigerant to the second heat exchange row group is also provided inside the above-mentioned collecting pipe, and the second flow limiting structure is provided with a second flow channel.

[0012] Furthermore, in some embodiments of the present solution, the flow cross-section of the first circulation channel is smaller than the flow cross-section of the second circulation channel, so that the refrigerant flow to the second heat exchange row group is greater than the refrigerant flow to the third heat exchange row group.

[0013] Furthermore, in some embodiments of the present solution, the first heat exchange row group, the second heat exchange row group and the third heat exchange row group respectively include flat tubes arranged along the length direction of the header.

[0014] Furthermore, in some embodiments of the present solution, the above-mentioned collecting pipes are respectively provided with flat tube grooves for assembling with the first heat exchange row group, the second heat exchange row group and the third heat exchange row group.

[0015] Furthermore, in some embodiments of the present solution, the header is divided into a plurality of tube cavities in the length direction, and each of the tube cavities is respectively connected to the first heat exchange row group, the second heat exchange row group and the third heat exchange row group.

[0016] An air conditioning system is provided with the above heat exchanger.

[0017] It can be seen from the above technical solution that the advantages and positive effects of the heat exchanger and air conditioning system of the present application are:

[0018] When the heat exchanger is cooling, the gas-liquid two-phase refrigerant enters the first heat exchange row group through the liquid refrigerant inlet pipe. After heat exchange in the first heat exchange row group, the refrigerant enters the header, and then flows out of the header from the second heat exchange row group and the third heat exchange row group. The number of pipes for the refrigerant entering and exiting the header is in a state of more outlets than in the second heat exchange row group, which reduces the pressure drop of the heat exchanger. The header in this scheme reduces the number of branches of the header compared to a heat exchanger with multiple rows in parallel, simplifies the processing technology of the header, and reduces the cost of the heat exchanger. When the heat exchanger is heating, the refrigerant enters the header from the second heat exchange row group and the third heat exchange row group, and then flows out of the header from the first heat exchange row group. The number of pipes for the refrigerant entering and exiting the header is in a state of more outlets than in the second heat exchange row group, which improves the rationality of the distribution of the refrigerant inlet and outlet pipes of the heat exchanger in the heating and cooling states, and improves the heat exchange effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0021] Figure 1 The figure is a schematic diagram showing the cooling flow of a refrigerant in a heat exchanger according to an exemplary embodiment.

[0022] Figure 2 According to an exemplary embodiment, Figure 1 Schematic diagram of refrigerant flow in the heat exchanger under heating state.

[0023] Figure 3 It is a schematic diagram of refrigerant cooling flow in another structural form of a heat exchanger according to an exemplary embodiment.

[0024] Figure 4 It is a schematic diagram of the refrigerant heating flow in another structural form of a heat exchanger according to an exemplary embodiment.

[0025] Figure 5 FIG. 1 is a schematic diagram of a header structure of a heat exchanger according to an exemplary embodiment.

[0026] Figure 6 FIG. 1 is another schematic diagram of the structure of a header of a heat exchanger according to an exemplary embodiment.

[0027] The reference numerals are described as follows:

[0028] 100-manifold; 200-first heat exchange row group; 300-second heat exchange row group; 400-third heat exchange row group; 500-liquid refrigerant inlet pipe; 600-first gaseous refrigerant inlet pipe; 700-second gaseous refrigerant inlet pipe;

[0029] 110-first current limiting structure; 120-second current limiting structure; 130-flat tube groove;

[0030] 111 - first circulation channel; 121 - second circulation channel. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0032] The present invention provides a heat exchanger and an air conditioning system. The heat exchanger includes a header 100 and a first heat exchange row group 200, a second heat exchange row group 300 and a third heat exchange row group 400 respectively connected to the header 100. The first heat exchange row group 200 is connected to a liquid refrigerant inlet pipe 500, and the second heat exchange row group 300 and the third heat exchange row group 400 are respectively connected to gaseous refrigerant inlet pipes. When the heat exchanger is cooling, the gas-liquid two-phase refrigerant enters the first heat exchange row group 200 through the liquid refrigerant inlet pipe 500. The refrigerant enters the header 100 after heat exchange in the first heat exchange row group 200, and then flows out of the header 100 from the second heat exchange row group 300 and the third heat exchange row group 400. The refrigerant enters and exits the header. The number of pipes of the tube 100 forms a state of more outlets than inlets. When the heat exchanger is heating, the refrigerant enters the header 100 from the second heat exchange row group 300 and the third heat exchange row group 400, and then flows out of the header 100 from the first heat exchange row group 200. The number of pipes for the refrigerant to enter and exit the header 100 forms a state of more outlets than inlets, which improves the rationality of the distribution of the refrigerant to enter and exit the header 100 in the heating state and the cooling state of the heat exchanger, reduces the pressure drop of the heat exchanger when the heat exchanger is cooling, and improves the heat exchange effect. Compared with the existing multi-row parallel heat exchanger, the heat exchanger of this scheme reduces the branch of the header 100, simplifies the processing technology of the header 100, and reduces the processing cost of the heat exchanger.

[0033] Combination Figure 1 and Figure 2 As shown, the heat exchanger includes a header 100, a first heat exchange row group 200, a second heat exchange row group 300, a third heat exchange row group 400, a liquid refrigerant inlet pipe 500, a first gaseous refrigerant inlet pipe 600 and a second gaseous refrigerant inlet pipe 700. The two ends of the first heat exchange row group 200 are respectively connected to the header 100 and the liquid refrigerant inlet pipe 500, the two ends of the second heat exchange row group 300 are respectively connected to the header 100 and the first gaseous refrigerant inlet pipe 600, and the two ends of the third heat exchange row group 400 are respectively connected to the header 100 and the second gaseous refrigerant inlet pipe 700.

[0034] The second heat exchange group 300 is located between the first heat exchange group 200 and the third heat exchange group 400. A first flow limiting structure 110 is provided between the second heat exchange group 300 and the third heat exchange group 400 in the manifold 100, and a second flow limiting structure 120 is provided between the first heat exchange group 200 and the second heat exchange group 300. The first flow limiting structure 110 is used to limit the flow of refrigerant flowing from the manifold 100 to the third heat exchange group 400. The first flow limiting structure 110 is provided with a first circulation channel 111, and the second flow limiting structure 120 is provided with a second circulation channel 121. Figure 5 and Figure 6 As shown, the first flow limiting structure 110 and the second flow limiting structure 120 separate the manifold 100 into three manifold cavities. Figure 1and Figure 2 On the basis of the structure, the manifold corresponding to the first heat exchange row group 200 is defined as the first manifold, the manifold corresponding to the second heat exchange row group 300 is defined as the second manifold, and the manifold corresponding to the third heat exchange row group 400 is defined as the third manifold. The first manifold and the second manifold are connected through the second circulation channel 121, and the second manifold and the third manifold are connected through the second circulation channel 121. The first heat exchange row group 200, the second heat exchange row group 300 and the third heat exchange row group 400 respectively include a plurality of flat tubes, and the manifold 100 is provided with three rows of flat tube grooves corresponding to the first heat exchange row group 200, the second heat exchange row group 300 and the third heat exchange row group 400, and each row includes a plurality of flat tube grooves 130.

[0035] like Figure 1 As shown, the heat exchanger is in a cooling state, the first heat exchange row group 200 is located on the windward side of the heat exchanger, and the gas-liquid two-phase refrigerant flows from the liquid refrigerant inlet pipe 500 to the first heat exchange row group 200, and then the refrigerant exchanges heat in the first heat exchange row group 200. The refrigerant after heat exchange flows into the first manifold of the manifold 100, and the refrigerant flows to the second manifold through the second flow channel 121. A part of the refrigerant in the second manifold flows out of the manifold 100 from the second heat exchange row group 300, and the other part flows to the third manifold through the first flow channel 111, and then flows out from the third heat exchange row group 400. The pipes for the refrigerant to enter and exit the manifold 100 are as follows: The number of paths forms a state of less inlet and more outlet. In this solution, the flow cross-section of the first circulation channel 111 is smaller than the flow cross-section of the second circulation channel 121, so that the refrigerant flow from the second heat exchange group 300 is greater than the refrigerant flow of the third heat exchange group 400. According to the temperature and movement direction of the heat exchange gas, the refrigerant flow distribution of the second heat exchange group 300 and the third heat exchange group 400 is improved. When the heat exchanger is cooling, the second heat exchange group 300 is located on the windward side of the third heat exchange group 400, so that the refrigerant distribution amount of the second heat exchange group 300 is greater than the refrigerant distribution amount of the third heat exchange group 400, thereby improving the heat exchange capacity of the heat exchanger.

[0036] like Figure 2As shown, the heat exchanger is in a heating state, the first heat exchange row group 200 is located on the windward side of the heat exchanger, the gaseous refrigerant enters the second heat exchange row group 300 from the first gaseous refrigerant inlet pipe 600, and enters the third heat exchange row group 400 from the second gaseous refrigerant inlet pipe 700. The refrigerant flow rate of the second heat exchange row group 300 is greater than the refrigerant flow rate of the third heat exchange row group 400. According to the understanding of those skilled in the art, the flow rate can be adjusted by a capillary tube or an electronic expansion valve. The refrigerant of the third heat exchange row group 400 flows into the third heat exchange row group 400 of the manifold 100. The collecting chamber then flows to the first collecting chamber through the first circulation channel 111 and the second circulation channel 121 in sequence, the refrigerant of the second heat exchange row group 300 flows into the second collecting chamber, and then flows to the first collecting chamber through the second circulation channel 121, and the refrigerant flows out of the collecting pipe 100 through the first heat exchange row group 200 in the first collecting chamber, and the number of pipes for the refrigerant to enter and exit the collecting pipe 100 forms a state of more inlet than outlet, which improves the rationality of the distribution of the refrigerant pipes in and out of the collecting pipe 100 in the heating state of the heat exchanger, and improves the heat exchange efficiency.

[0037] Combination Figure 3 and Figure 4 As shown, in this solution, the first heat exchange group 200 can also be arranged between the second heat exchange group 300 and the third heat exchange group 400, and a first flow limiting structure 110 is arranged between the first heat exchange group 200 and the third heat exchange group 400 in the manifold 100, and a second flow limiting structure 120 is arranged between the first heat exchange group 200 and the second heat exchange group 300. In this structural state, when the heat exchanger is in use, the second heat exchange group 300 can be located on the windward side of the heat exchanger.

[0038] exist Figure 3 and Figure 4 On the basis of the structure, the manifold corresponding to the first heat exchange row group 200 is defined as a first manifold, the manifold corresponding to the second heat exchange row group 300 is defined as a second manifold, and the manifold corresponding to the third heat exchange row group 400 is defined as a third manifold. The heat exchanger is in a cooling state, and the gas-liquid two-phase refrigerant flows from the liquid refrigerant inlet pipe 500 to the first heat exchange row group 200, and then the refrigerant exchanges heat in the first heat exchange row group 200. The refrigerant after heat exchange flows into the first manifold of the manifold 100. The refrigerant in the first manifold is divided into two parts and flows in opposite directions. One part of the refrigerant flows to the second manifold through the second flow channel 121, and the other part of the refrigerant flows from the first flow channel 111 to the third manifold. Since the third heat exchange row group 400 is located on the leeward side of the heat exchanger, the flow section of the first flow channel 111 is smaller than the flow section of the second flow channel 121, so that the refrigerant flow of the second heat exchange row group 300 is greater than the refrigerant flow of the third heat exchange row group 400, thereby improving the heat exchange efficiency of the heat exchanger. Figure 4As shown, the heat exchanger is in a heating state, and the gaseous refrigerant enters the header 100 from the second heat exchange row group 300 and the third heat exchange row group 400 , and then flows out of the header 100 from the first heat exchange row group 200 .

[0039] like Figure 5 As shown, the first flow limiting structure 110 includes baffles arranged on opposite sides of the manifold 100, and the gap between the two baffles forms a first flow channel 111. The second flow limiting structure 120 is also composed of baffles arranged on opposite sides of the manifold 100. The first flow limiting structure 110 and the second flow limiting structure 120 are extended along the length direction of the manifold 100 and are respectively connected to the two ends of the length direction of the manifold 100 to ensure the flow limiting effect. The gap between the two baffles of the second flow limiting structure 120 is larger than the gap between the two baffles of the first flow limiting structure 110, so that the flow cross-section of the first flow channel 111 is smaller than the flow cross-section of the second flow channel 121, so that the refrigerant flow of the second heat exchange row group 300 is greater than the refrigerant flow of the third heat exchange row group 400.

[0040] According to the understanding of those skilled in the art, in this solution, the first flow limiting structure 110 and the second flow limiting structure 120 can also be eliminated, and the number of refrigerant pipes entering and exiting the header 100 can also be realized to form a state of more inlet and less outlet when the heat exchanger is heating, and the number of refrigerant pipes entering and exiting the header 100 can be realized to form a state of less inlet and more outlet when the heat exchanger is cooling, thereby improving the rationality of the distribution of refrigerant pipes entering and exiting the header 100 and improving the heat exchange efficiency. It is also possible to set only the first flow limiting structure 110 to limit the refrigerant flow from the header 100 to the third heat exchange row group 400. According to the use status of the heat exchanger, when the third heat exchange row group 400 is located on the leeward side of the heat exchanger, the refrigerant flow is reasonably distributed to improve the heat exchange efficiency.

[0041] like Figure 6 As shown, the first flow limiting structure 110 and the second flow limiting structure 120 are respectively formed by a baffle, and the baffles of the first flow limiting structure 110 and the second flow limiting structure 120 are respectively connected to the wall surface on one side of the collecting tube 100 and extend toward the other side wall surface opposite to the collecting tube 100. The gap formed by the baffle of the first flow limiting structure 110 and the other side wall surface opposite to the collecting tube 100 is the first flow channel 111, and the gap formed by the baffle of the second flow limiting structure 120 and the other side wall surface opposite to the collecting tube 100 is the second flow channel 121. The extension direction of the baffle of the first flow limiting structure 110 and the extension direction of the baffle of the second flow limiting structure 120 are the same. The extension direction of the baffle of the first flow limiting structure 110 is defined as the height direction. The height of the baffle of the first flow limiting structure 110 is greater than the height of the baffle of the second flow limiting structure 120, so that the flow end surface of the first flow channel 111 is greater than the flow end surface of the second flow channel 121.

[0042] According to the understanding of those skilled in the art, in this solution, the first circulation channel 111 can be opened in the circulation hole of the first flow limiting structure 110, and the second circulation channel 121 can be a circulation hole opened in the second flow limiting structure 120, and the circulation hole of the first flow limiting structure 110 is smaller than the circulation hole of the second flow limiting structure 120. The cross-section of the circulation hole can be circular, square, triangular or other shapes that can realize the circulation of the refrigerant.

[0043] This embodiment also provides an air conditioning system, which is equipped with an upper heat exchanger.

[0044] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0045] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A heat exchanger, characterized in that: It comprises a header (100) and a first heat exchange row group (200), a second heat exchange row group (300) and a third heat exchange row group (400) respectively connected to the header (100); The first heat exchange row group (200) is connected to a liquid refrigerant inlet pipe (500), and the second heat exchange row group (300) and the third heat exchange row group (400) are respectively connected to a gaseous refrigerant inlet pipe; The manifold (100) is provided with a first flow limiting structure (110) for limiting the flow of refrigerant flowing to the third heat exchange row group (400), and the first flow limiting structure (110) is provided with a first flow channel (111) for the circulation of refrigerant. The manifold (100) is also provided with a second flow limiting structure (120) for limiting the flow of refrigerant flowing to the second heat exchange row group (300). The first flow limiting structure (110) and the second flow limiting structure (120) divide the manifold (100) into three manifold cavities, and the second flow limiting structure (120) is provided with a second flow channel (121). The flow cross section of the first flow channel (111) is smaller than the flow cross section of the second flow channel (121), so that the flow of refrigerant flowing to the second heat exchange row group (300) is greater than the flow of refrigerant flowing to the third heat exchange row group (400).

2. The heat exchanger according to claim 1, characterized in that: The first heat exchange row group (200) is located between the second heat exchange row group (300) and the third heat exchange row group (400).

3. The heat exchanger according to claim 1, characterized in that: The second heat exchange row group (300) is located between the first heat exchange row group (200) and the third heat exchange row group (400).

4. The heat exchanger according to claim 1, characterized in that: The first heat exchange row group (200), the second heat exchange row group (300) and the third heat exchange row group (400) respectively comprise flat tubes arranged along the length direction of the header (100).

5. The heat exchanger according to claim 1, characterized in that: The header (100) is respectively provided with flat tube grooves (130) for assembling with the first heat exchange row group (200), the second heat exchange row group (300) and the third heat exchange row group (400).

6. The heat exchanger according to claim 1, characterized in that The header (100) is divided into a plurality of tube cavities in the length direction, and each of the tube cavities is respectively connected to the first heat exchange row group (200), the second heat exchange row group (300), and the third heat exchange row group (400).

7. An air conditioning system, characterized in that: A heat exchanger according to any one of claims 1 to 6 is installed.

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