Heat exchanger and refrigerating system

Abstract

The utility model relates to the technical field of refrigeration, in particular to a heat exchanger and a refrigeration system. The utility model provides a heat exchanger which comprises a plurality of heat exchange pipes which are arranged at intervals in the first preset direction. One end of each capillary tube is communicated with the distributor, and the other end of each capillary tube is correspondingly communicated with the inlet section of each heat exchange tube; and the balance assembly comprises a collecting pipe and a plurality of branch pipes communicated with the collecting pipe, each branch pipe is correspondingly communicated with the inlet section of each heat exchange pipe, each capillary pipe is correspondingly communicated with each branch pipe, and the heat exchange pipes are mutually communicated through the branch pipes and the collecting pipe. The utility model further provides a refrigerating system. The heat exchanger has the advantages that refrigerants with high pressure can flow into the heat exchange pipes with low pressure, the pressure of the refrigerants in the heat exchange pipes is balanced, heat exchange of the heat exchanger is even, and therefore the performance of the heat exchanger is enhanced.

Description

TECHNICAL FIELD

[0001] The utility model relates to refrigeration technical field especially relates to a heat exchanger and refrigerating system. BACKGROUND

[0002] In the refrigeration system, refrigerant exchanges heat with the outside through the heat exchanger, the heat exchanger usually includes balance assembly, balance assembly is used for even distribution refrigerant, balance assembly includes distributor and capillary, refrigerant is distributed through distributor, and refrigerant enters heat exchange pipe from multiple capillaries after distribution.

[0003] In prior art, limited by installation space, the heat exchanger is vertically installed, and each heat exchange pipe is arranged from top to bottom, and each heat exchange pipe is different in position in height direction, which causes different pressure drops when refrigerant enters each heat exchange pipe, so that the heat exchanger exchanges heat unevenly, and the performance of the heat exchanger is affected. SUMMARY

[0004] Therefore, it is necessary to provide a heat exchanger and refrigeration system, which can improve the heat exchange performance of the heat exchanger.

[0005] A heat exchanger comprises multiple heat exchange pipes, and the multiple heat exchange pipes are arranged at intervals along a first preset direction.

[0006] Each capillary is in communication with the distributor at one end, and in communication with the inlet section of each heat exchange pipe at the other end.

[0007] The balance assembly comprises a header and multiple branch pipes in communication with the header, each branch pipe is in communication with the inlet section of each heat exchange pipe, and each capillary is in communication with each branch pipe.

[0008] In this way, the refrigerant with higher pressure in the heat exchange pipe can flow into the heat exchange pipe with lower pressure, the pressure of the refrigerant in each heat exchange pipe is balanced, the heat exchange of each heat exchanger is uniform, and thus the performance of the heat exchanger is improved, and the energy efficiency ratio of the entire refrigeration system is improved.

[0009] In one embodiment, multiple connection openings are formed in the header, the multiple connection openings correspond to the multiple branch pipes, each capillary is arranged in the multiple connection openings and is sleeved in the branch pipe, the multiple branch pipes have first channels in communication with the multiple heat exchange pipes, and the multiple first channels are in communication with each other.

[0010] In one embodiment, the outer wall of the capillary and the inner wall of the branch pipe are in clearance fit to form the first channel.

[0011] In this way, the structure is simple, and no other structure needs to be added to form the first channel.

[0012] In one of the embodiments, the capillary tube sleeved on the branch pipe is coaxially arranged with the branch pipe; or, the outer wall of the capillary tube sleeved on the branch pipe is partially attached to the inner wall of the branch pipe; or, the axial direction of the capillary tube at least partially sleeved on the branch pipe is eccentric to the axial direction of the branch pipe.

[0013] In one of the embodiments, the capillary tube protrudes from the end face of the branch pipe at one end of the branch pipe.

[0014] In this way, the capillary tube can be inserted into the heat exchange pipe, and the refrigerant is preferentially ensured to enter the heat exchange pipe for heat exchange. The excess refrigerant is returned through the first channel, preventing the refrigerant from flowing back to the inlet of the expansion valve from the first channel without entering the heat exchange pipe, so that the refrigerant directly enters the heat exchanger without being throttled and depressurized, and the refrigerant cannot be heat-exchanged with the outside, affecting the heat exchange effect and the performance of the refrigeration system.

[0015] In one of the embodiments, the length L1 of the capillary tube inserted into the heat exchange pipe is 110mm-120mm.

[0016] In this way, the material is saved, and the capillary tube with sufficient length can be inserted into the heat exchange pipe.

[0017] In one of the embodiments, the annular protrusion is arranged on the header and extends away from the branch pipe, and the annular protrusion is arranged around the connecting port and is sealingly connected with the capillary tube.

[0018] In this way, the contact area of the connecting port and the capillary tube can be increased, so as to enhance the connection strength of the capillary tube and the header.

[0019] In one of the embodiments, the header has an inner cavity, a plurality of the heat exchange pipes are connected with each other through the inner cavity, a return port is arranged on the header and is in communication with the inner cavity, the return port is unidirectionally connected with the inlets of a plurality of the capillary tubes, and / or the length L2 of the branch pipe is 50mm-85mm.

[0020] Thus, the refrigeration system can adapt to harsh working conditions, especially when the refrigeration system is used for heating in winter in the north, and the refrigerant in the heat exchanger cannot be evaporated due to extremely low outdoor temperature, and the excess refrigerant can flow back to the front of the expansion valve through the back port, preventing the compressor from being liquid knocked due to the incomplete evaporation of the excessive refrigerant in the heat exchanger, and controlling the flow of the refrigerant into the heat exchanger, so that the heat exchange performance of the heat exchanger is optimal, thereby improving the energy efficiency ratio of the refrigeration system.

[0021] The utility model discloses still provide a kind of refrigeration system, including expansion valve and above-mentioned heat exchanger, the outlet of the expansion valve is communicated with the inlet of the distributor, back port is communicated with the inlet of the expansion valve in the back port being set on the header and being communicated with the heat exchange pipe.

[0022] Thus, the refrigeration system can adapt to harsh working conditions, especially when the refrigeration system is used for heating in winter in the north, and the refrigerant in the heat exchanger cannot be evaporated due to extremely low outdoor temperature, and the excess refrigerant can flow back to the front of the expansion valve through the back port, preventing the compressor from being liquid knocked due to the incomplete evaporation of the excessive refrigerant in the heat exchanger, and controlling the flow of the refrigerant into the heat exchanger, so that the heat exchange performance of the heat exchanger is optimal, thereby improving the energy efficiency ratio of the refrigeration system.

[0023] In one embodiment, the refrigeration system further comprises a check valve, the inlet of the check valve is communicated with the back port, and the outlet of the check valve is communicated with the inlet of the expansion valve.

[0024] Thus, the refrigeration system can adapt to harsh working conditions, especially when the refrigeration system is used for heating in winter in the north, and the refrigerant in the heat exchanger cannot be evaporated due to extremely low outdoor temperature, and the excess refrigerant can flow back to the front of the expansion valve through the back port, preventing the compressor from being liquid knocked due to the incomplete evaporation of the excessive refrigerant in the heat exchanger, and controlling the flow of the refrigerant into the heat exchanger, so that the heat exchange performance of the heat exchanger is optimal, thereby improving the energy efficiency ratio of the refrigeration system.

[0025] The utility model discloses a plurality of heat exchange pipes are communicated each other, so as to balance the pressure between the heat exchange pipes, and the refrigerant with higher pressure in the heat exchange pipe flows into the heat exchange pipe with lower pressure, so that the pressure in each heat exchange pipe is same, and the heat exchange uniformity of the heat exchanger is improved. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or in the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0027] Figure 1 The structure diagram of the balance assembly provided by the present application is shown in the figure.

[0028] Figure 2 The structure diagram of the heat exchanger in the prior art is shown in the figure.

[0029] Figure 3 The top view of the balance assembly of the present application is shown in the figure.

[0030] Figure 4 The partial sectional view of the balance assembly of the present application is shown in the figure.

[0031] Figure 5 The schematic diagram of the refrigerant backflow of the present application is shown in the figure.

[0032] Figure 6 The schematic diagram of the process that the refrigerant in the first channel with higher pressure flows into the first channel with lower pressure of the present application is shown in the figure.

[0033] Figure 7 The schematic diagram of the refrigeration system provided by the present application is shown in the figure.

[0034] The figure shows: 100', heat exchanger; 10', distribution assembly; 11', capillary tube; 20', distributor; 30', heat exchange tube; 1000, refrigeration system; 100, heat exchanger; 10, balance assembly; 11, capillary tube; 12, header; 121, connecting port; 122, branch pipe; 123, inner cavity; 124, return port; 125, annular protrusion; 126, first channel; 20, distributor; 200, expansion valve; 300, non-return element; 400, compressor; 500, four-way valve; 600, second heat exchanger; 700, connecting pipe. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned purposes, features and advantages of the present application more apparent and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings. In the following description, many specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0036] It should be understood that when an element is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element or intervening elements can also be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element, there are no intervening elements present. It will be understood that, although the terms "first," "second," etc. can be used herein to describe various elements, these elements should not be limited by these terms since such terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element without departing from the scope of the application.

[0037] In addition, the terms "first", "second", etc. are used herein only to describe various elements, and are not used to denote or imply relative importance or a number of indications of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0038] In the present application, unless otherwise specifically defined and limited, the first feature is "on", "under" the second feature, which can be directly in contact with the second feature, or indirectly in contact with the second feature through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0039] Unless otherwise defined, all technical and scientific terms used in the specification of the present application have the same meaning as understood by those skilled in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing the specific embodiments, and are not intended to limit the present application. The term "and / or" used in the specification of the present application includes any and all combinations of one or more related listed items.

[0040] As shown in Figure 1 and Figure 7 As shown in Figure 1 is a structural schematic view of the balance assembly 10 provided by the present application, Figure 7 is a schematic view of the refrigeration system 1000 provided by the present application. The present application provides a heat exchanger 100 installed in the refrigeration system 1000, which is used to realize heat exchange with the outside.

[0041] The heat exchanger 100 comprises a plurality of heat exchange pipes (not labeled in the figure), a plurality of capillary pipes 11 and a balance assembly 10, the plurality of capillary pipes 11 are communicated with the plurality of heat exchange pipes respectively, and the plurality of heat exchange pipes are arranged at intervals along a first preset direction.

[0042] The balance assembly 10 comprises a header 12 and a plurality of branch pipes 122, the branch pipe 122 is arranged on the header 12 and communicated with the header 12, each branch pipe 122 is communicated with the plurality of heat exchange pipes respectively, each capillary pipe 11 is communicated with each branch pipe 122 correspondingly, and the plurality of heat exchange pipes are communicated through the branch pipe 122 and the header 12.

[0043] As shown in Figure 2 , Figure 2 , it is a structural schematic view of the heat exchanger 100' in the prior art. In the prior art, the heat exchanger 100' comprises a distribution assembly 10' and a heat exchange pipe 30', the distribution assembly 10' is connected to the heat exchange pipe 30' and used for distributing refrigerant and sending the refrigerant into the heat exchange pipe 30'. The distribution assembly 10' comprises a distributor 20' and a plurality of capillary pipes 11', the plurality of capillary pipes 11' are connected with the distributor 20', the plurality of capillary pipes 11' are communicated with the plurality of heat exchange pipes 30' respectively, and the refrigerant distributed through the distributor 20' enters each heat exchange pipe 30' through the plurality of capillary pipes 11' to exchange heat. Since the height positions of the plurality of heat exchange pipes 30' are different, the pressures of the refrigerant entering the plurality of heat exchange pipes 30' are different, so that the heat exchange of the heat exchanger 100' is uneven, thereby affecting the heat exchange performance of the heat exchanger 100'.

[0044] The utility model discloses a plurality of capillary pipes 11 distribute refrigerant to a plurality of heat exchange pipes, and each heat exchange pipe is arranged to be communicated with each other through the branch pipe 122 and the header 12, so as to balance the pressure of the refrigerant in each heat exchange pipe, thereby making the heat exchanger 100 exchange heat uniformly and strengthening the performance of the heat exchanger 100.

[0045] The header 12 is provided with a plurality of branch pipes 122, the plurality of capillary pipes 11 are respectively inserted into the header 12 from the plurality of connecting ports 121 and arranged in the branch pipes 122, and the plurality of capillary pipes 11 are communicated with the heat exchange pipes through the branch pipes 122, the branch pipes 122 are communicated with the heat exchange pipes, the plurality of branch pipes 122 are respectively provided with a plurality of first channels 126, the plurality of first channels 126 are communicated with each other, and the plurality of first channels 126 are communicated with the plurality of heat exchange pipes correspondingly.

[0046] As shown in Figure 4 , Figure 4This is a top view of the balancing component 10 of this utility model. The outer wall of the capillary 11 and the inner wall of the branch pipe 122 are fitted together to form a first channel 126. The structure is simple and does not require additional structures to form the first channel 126.

[0047] In one embodiment, the portion of the capillary tube 11 that extends into the branch pipe 122 is coaxial with the branch pipe 122, that is, the connection port 121 and the branch pipe 122 are coaxial. The periphery of the capillary tube 11 and the inner wall of the branch pipe 122 have gaps of equal size, so the refrigerant flow velocity is uniform and the flow resistance of the refrigerant can be reduced.

[0048] In another embodiment, one side of the outer wall of the capillary 11 can also be attached to the inner wall of the branch pipe 122, that is, part of the outer wall of the capillary 11 and the inner wall of the branch pipe 122 are attached to each other, thereby improving the stability of the capillary 11 structure installation.

[0049] In another embodiment, the sidewalls of the capillary tube 11 are all separated from the inner wall of the branch pipe 122 by gaps of different sizes. That is, the axial direction of the part of the capillary tube 11 fitted inside the branch pipe 122 is eccentrically set with respect to the axial direction of the branch pipe 122, so that the flow velocity of the refrigerant in the first channel 126 at different positions is different, which is beneficial to the disturbance of the refrigerant, improves the uniformity of refrigerant distribution, and improves the heat exchange efficiency.

[0050] like Figure 3 As shown, Figure 3 This is a partial cross-sectional view of the balancing assembly 10 of this utility model. The manifold 12 has an inner cavity 123, which communicates with each of the first channels 126. The first channels 126 are connected to each other through the inner cavity 123. A return port 124 is provided on the manifold 12, communicating with the inner cavity 123. The return port 124 is used for one-way connection to the inlet of the expansion valve 200. Thus, excess refrigerant can flow back to the expansion valve 200 from the return port 124. This configuration allows for adjustment of the refrigerant flow rate into the heat exchanger 100 under different environmental conditions, improving the overall performance of the refrigeration system 1000. It is understandable that when the outdoor temperature is low, especially in northern winters, the outdoor heat exchanger 100, used for heating, functions as an evaporator, requiring less refrigerant. However, when the outdoor temperature drops suddenly, a significant amount of refrigerant in the heat exchange tubes cannot absorb heat from the external environment and evaporates. This liquid refrigerant enters the compressor 400, causing liquid slugging. Simultaneously, the refrigerant parameters entering the compressor 400 cannot reach the designed parameters, preventing the refrigeration system 1000 from achieving its optimal energy efficiency ratio and resulting in energy waste.

[0051] Furthermore, the manifold 12 is ring-shaped, with the branch pipe 122 and the return port 124 located on both sides, so that the path of the refrigerant in each first channel 126 to the return port 124 is not too long, thereby avoiding excessive refrigerant flow loss.

[0052] The two ends of the manifold 12 extend to form a long strip, so that each branch pipe 122 can be aligned with the corresponding heat exchange tube, and the capillary tube 11 can be inserted vertically into the heat exchange tube, saving the cost of the capillary tube 11.

[0053] The branch pipe 122 is open at the end away from the manifold 12, so that the capillary tube 11 can be inserted into the heat exchange tube.

[0054] The opening of the branch pipe 122 is oriented opposite to that of the return port 124 so as to be properly installed in the heat exchanger 100. The orientation of the connection port 121 is the same as that of the return port 124. The connection port 121 and the return port 124 are respectively located on both sides, which can stagger the connection between the manifold 12 and the capillary tube 11 and the expansion valve 200 to prevent interference during installation.

[0055] One end of the capillary tube 11 protrudes from the end face of the branch pipe 122, allowing it to extend into the heat exchanger 100. The refrigerant flowing out of the capillary tube 11 preferentially enters the heat exchange tube for heat exchange, meeting the heat exchange requirements. Excess refrigerant then flows out through the first channel 126, preventing the refrigerant from flowing back to the inlet of the expansion valve 200 directly from the first channel 126 without entering the heat exchange tube. Otherwise, the refrigerant would not undergo throttling and pressure reduction before directly entering the heat exchanger 100, preventing heat exchange between the refrigerant and the outside environment, thus affecting the heat exchange effect and consequently the performance of the refrigeration system.

[0056] Please continue reading Figure 4 , Figure 4 This is a partial cross-sectional view of the balancing assembly 10 of this utility model. Preferably, the length L1 of the capillary tube 11 extending into the manifold 12 and branch pipe 122 is 110mm to 120mm, so that the capillary tube 11 can be fully inserted into the heat exchange tube. L1 can be 110mm, 113mm, 115mm, 118mm, 120mm or any other value between 110mm and 120mm.

[0057] One end of the branch pipe 122 extends into the heat exchange tube, and the outer wall of the branch pipe 122 and the inner wall of the heat exchange tube are attached to each other and fixedly connected by welding. Alternatively, one end of the heat exchange tube extends into the branch pipe 122, and the outer wall of the heat exchange tube and the inner wall of the branch pipe 122 are attached to each other and fixedly connected by welding.

[0058] Specifically, the length L2 of the branch pipe 122 is 50mm to 85mm. This not only strengthens the connection between the branch pipe 122 and the heat exchange tube but also saves materials and reduces costs. Understandably, if the branch pipe 122 is too long, it increases material costs; if it is too short, the contact area between the branch pipe 122 and the heat exchange tube is reduced, affecting the connection strength. The length L2 of the branch pipe 122 can be 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 80mm, 85mm, or any other value between 50mm and 85mm.

[0059] The manifold 12 is provided with an annular protrusion 125, which surrounds the connection port 121, and the capillary tube 11 and the annular protrusion 125 are sealed together.

[0060] The outer wall of the capillary tube 11 and the inner wall of the annular protrusion 125 are attached and fixed by welding. The annular protrusion 125 can strengthen the connection between the manifold 12 and the capillary tube 11.

[0061] The annular protrusion 125 and the branch pipe 122 are coaxially arranged, so that the capillary tube 11 can be directly inserted into the branch pipe 122 after being inserted vertically without turning, which enhances the convenience of installation.

[0062] The heat exchanger 100 also includes a distributor 20. One end of the capillary tube 11 is connected to the distributor 20, and the other end is connected to the inlet section of the heat exchange tube. The manifold 12 is connected to the heat exchange tube. The refrigerant distributed by the distributor 20 enters each heat exchange tube through multiple capillary tubes 11. The refrigerant with higher pressure flows from the first channel 126 into the inner cavity 123 and then flows into the first channel 126 with lower pressure, thereby balancing the pressure of the refrigerant in each heat exchange tube.

[0063] During installation, the manifold 12 is vertically arranged along the height direction of the heat exchanger 100, so that the branch pipe 122 can be close to the corresponding heat exchange tube. This not only makes the overall structure of the heat exchanger 100 more compact, but also shortens the length of the capillary tube 11 and reduces costs.

[0064] Furthermore, the opening of the branch pipe 122 faces the heat exchange tube, and the return port 124 faces the expansion valve 200, which further makes the structure of the heat exchanger 100 more compact.

[0065] Please continue reading Figure 7 The present invention also provides a refrigeration system 1000, including an expansion valve 200 and the heat exchanger 100 mentioned above. The inlet of the expansion valve 200 is connected to the return port 124, and the outlet of the expansion valve 200 is connected to the inlet of the distributor 20.

[0066] Specifically, the refrigeration system 1000 also includes a check valve 300, which is located between the return port 124 and the expansion valve 200. The inlet of the check valve 300 is connected to the return port 124, and the outlet is connected to the inlet of the expansion valve 200. The check valve 300 ensures that the refrigerant can only flow from the manifold 12 to the inlet of the expansion valve 200, and cannot flow directly from the inlet of the expansion valve 200 to the manifold 12. It is understandable that without the check valve 300, the refrigerant would flow directly from the manifold 12 into the heat exchange tubes without passing through the throttling and pressure reduction of the expansion valve 200.

[0067] In one embodiment, the expansion valve 200 is an electronic expansion valve 200, which can automatically adjust the opening size according to the parameters of the refrigeration system 1000, thereby automatically adjusting the refrigerant flow rate.

[0068] In one embodiment, the check valve 300 is a one-way valve, which is inexpensive.

[0069] The refrigeration system 1000 also includes a connecting pipe 700, and a check valve 300 is provided on the connecting pipe 700. One end of the connecting pipe 700 is connected to the inlet of the expansion valve 200, and the other end is connected to the return port 124. The connecting pipe is installed vertically and parallel to the manifold 12, making the overall structure of the refrigeration system 1000 compact.

[0070] In one embodiment, a shut-off element (not shown) can be provided on the connecting pipe 700. During refrigeration operation, if it is necessary to disconnect this branch of the connecting pipe 700, the shut-off element can be closed to achieve the shutdown. The shut-off element can be a solenoid valve, a gate valve, or other shut-off element capable of achieving shutdown.

[0071] Furthermore, the refrigeration system 1000 also includes a compressor 400, a four-way valve 500, and a second heat exchanger 600. The inlet and outlet of the compressor 400 are respectively connected to the four-way valve 500. The four-way valve 500 is connected to the second heat exchanger 600 and the heat exchanger 100 of this application. The second heat exchanger 600 is connected to the expansion valve 200. The second heat exchanger 600 is installed indoors, while the heat exchanger 100 of this application is installed outdoors. Of course, the heat exchanger 100 of this application can also be installed indoors. The four-way valve 500 can be reversed, enabling the refrigeration system 1000 to provide heating in summer and heating in winter.

[0072] Taking the heating mode as an example, the refrigerant absorbs heat and evaporates in the outdoor heat exchanger 100, forming a low-pressure, low-temperature gaseous refrigerant. It then enters the compressor 400 through the passage of the four-way valve 500. After the compressor 400 performs work, it becomes a high-temperature, high-pressure gaseous refrigerant, which then enters the indoor second heat exchanger 600. The refrigerant releases heat in the second heat exchanger 600, raising the indoor temperature. The refrigerant condenses in the second heat exchanger 600 to form a liquid refrigerant, which mixes with the refrigerant from the return port 124 and enters the expansion valve 200 for throttling and pressure reduction. It then enters the balance assembly 10 and subsequently enters the heat exchange tubes to absorb heat and evaporate.

[0073] Please see Figure 5 , Figure 6 and Figure 7 , Figure 5 This is a schematic diagram of the refrigerant reflux of this utility model. Figure 6 This is a schematic diagram illustrating the process of refrigerant flowing from the higher-pressure first channel 126 into the lower-pressure first channel 126 of this invention. Figure 7 This is a schematic diagram of the refrigeration system 1000 provided by this utility model. During operation, the refrigerant is throttled and depressurized by the expansion valve 200, then distributed by the distributor 20 into each capillary tube 11, and then into each heat exchange tube. Due to the different heights of the heat exchange tubes, the refrigerant pressures entering each heat exchange tube are different. After entering the heat exchange tubes, the refrigerant with higher pressure enters the lower pressure first channel 126 through the corresponding first channel 126 and inner cavity 123, achieving pressure equalization of the refrigerant in each heat exchange tube. When encountering severe operating conditions, especially when the refrigeration system 1000 is used for heating in northern winters, due to the sudden drop in temperature, the refrigerant in the heat exchanger 100 cannot evaporate completely. The excess refrigerant enters the inner cavity 123 through the first channel 126, and then returns to the inlet of the expansion valve 200 through the return port 124.

[0074] The technical features of the above-described embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0075] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present utility model and are not intended to limit the present utility model. Any appropriate changes and variations made to the above embodiments within the scope of the essential spirit of the present utility model shall fall within the scope of protection claimed by the present utility model.

Claims

1. A heat exchanger, characterized by, The application relates to a heat exchange device. The heat exchange device comprises a plurality of heat exchange pipes which are arranged at intervals along a first preset direction; a distributor (20) and a plurality of capillary tubes (11), one end of each of the capillary tubes (11) being communicated with the distributor (20), and the other end of each of the capillary tubes (11) being communicated with an inlet section of each of the heat exchange pipes; and a balance assembly (10) which comprises a header (12) and a plurality of branch pipes (122) communicated with the header (12), each of the branch pipes (122) being arranged to be communicated with the inlet section of each of the heat exchange pipes, and each of the capillary tubes (11) being communicated with each of the branch pipes (122), and the plurality of heat exchange pipes being communicated with each other through the plurality of branch pipes (122) and the header (12).

2. The heat exchanger of claim 1, wherein The header (12) is provided with a plurality of connecting openings (121) corresponding to the plurality of branch pipes (122), each of the capillary tubes (11) is respectively arranged in the plurality of connecting openings (121) and is sleeved in the branch pipes (122), and the plurality of branch pipes (122) respectively have first channels (126) communicated with the plurality of heat exchange pipes, and the plurality of first channels (126) are communicated with each other.

3. The heat exchanger of claim 2, wherein The outer wall of the capillary tube (11) and the inner wall of the branch pipe (122) are in clearance fit to form the first channel (126).

4. The heat exchanger of claim 3, wherein The capillary tube (11) sleeved in the branch pipe (122) is coaxially arranged with the branch pipe (122), or the outer wall of the capillary tube (11) sleeved in the branch pipe (122) is partially attached to the inner wall of the branch pipe (122), or the axial direction of the capillary tube (11) at least partially sleeved in the branch pipe (122) is eccentric to the axial direction of the branch pipe (122).

5. The heat exchanger of claim 2, wherein One end of the capillary tube (11) arranged in the branch pipe (122) is protruded relative to the end face of the branch pipe (122).

6. The heat exchanger of claim 2, wherein The length L1 of the capillary tube (11) extending into the header (12), the branch pipe (122) and the heat exchange pipe is 110mm-120mm.

7. The heat exchanger of claim 2, wherein The header (12) is provided with an annular protrusion (125) extending away from the branch pipe (122), the annular protrusion (125) is arranged around the connecting opening (121) and is sealingly connected with the capillary tube (11).

8. The heat exchanger of claim 1, wherein The header (12) has an inner cavity (123), the plurality of heat exchange pipes are communicated with each other through the inner cavity (123), the header (12) is provided with a return port (124) communicated with the inner cavity (123), the return port (124) is unidirectionally communicated with the inlets of the plurality of capillary tubes (11), and / or the length L2 of the branch pipe (122) is 50mm-85mm.

9. A refrigeration system characterized by, The heat exchanger comprises an expansion valve (200) and the heat exchanger as claimed in any one of claims 1-8, the outlet of the expansion valve (200) is communicated with the inlet of the distributor (20), a return port (124) communicated with the heat exchange tube is formed on the header (12), and the return port (124) is unidirectionally communicated with the inlet of the expansion valve (200).

10. The refrigeration system of claim 9, wherein, The refrigeration system further comprises a check valve (300), the inlet of the check valve (300) is communicated with the return port (124), and the outlet of the check valve (300) is communicated with the inlet of the expansion valve (200).

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