Heat exchanger and heat exchange system

Abstract

The application provides a heat exchanger and a heat exchange system. The heat exchanger comprises a shell, a liquid inlet and an exhaust port arranged on the shell, and a liquid distribution structure arranged in the shell and separating the shell into a heat exchange cavity and an exhaust cavity. The liquid inlet is communicated with the heat exchange cavity, and the exhaust port is communicated with the exhaust cavity. The heat exchanger and the heat exchange system provided by the application separate the shell into the relatively sealed heat exchange cavity and the exhaust cavity by the liquid distribution structure, so that the gaseous refrigerant generated in the heat exchange cavity must pass through the liquid distribution cavity of the liquid distribution structure and collide with the inner wall of the liquid distribution cavity during the flowing process, thereby ensuring the purity of the gaseous refrigerant discharged from the exhaust port, effectively overcoming the problem of liquid entrainment in the suction of the compressor in the prior art, and ensuring the reliable operation of the heat exchange system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air treatment equipment, in particular to a heat exchanger and a heat exchange system. BACKGROUND

[0002] The full-liquid evaporator is generally used in the refrigeration system. The heat exchange pipe of the full-liquid evaporator is filled with water, and the refrigerant evaporates outside the heat exchange pipe, so that the heat transfer surface is basically in contact with the liquid. After the refrigerant liquid absorbs heat and vaporizes, it flows out through the fluid outlet at the top of the shell. The full-liquid evaporator has compact structure, convenient operation and management, and high heat transfer coefficient.

[0003] In the heat exchange system, the compressor will suck the low-temperature and low-pressure gaseous refrigerant from the evaporator for compression, and supply the high-temperature and high-pressure gaseous refrigerant to the condenser after compression. Since the gaseous refrigerant is separated from the liquid refrigerant during heat exchange in the evaporator, the gaseous refrigerant will carry the liquid refrigerant at the same time into the compressor, which will cause the problem of liquid suction of the compressor. For the positive displacement compressor, when the problem of liquid suction exists, the compression efficiency of the compressor will be reduced due to the fact that the liquid refrigerant cannot be compressed. For the high-speed rotating centrifugal compressor, when the problem of liquid suction exists, the "cavitation" phenomenon will occur, which will cause the blade to be damaged and a safety accident will occur.

[0004] In order to avoid the problem of liquid suction of the compressor in the prior art, a gas-liquid separator is generally arranged between the compressor and the evaporator to separate the exhaust gas of the evaporator by using the gas-liquid separator, which will cause the gas-liquid separator to occupy space and increase the cost of the heat exchange system. A stainless steel wire mesh, a liquid blocking plate or the like structure is arranged at the exhaust port of the evaporator, but the liquid separation effect is poor, and there is still liquid refrigerant in the exhaust gas of the heat exchanger, which will cause the problem that the compressor cannot work normally. SUMMARY

[0005] In order to solve the technical problem that the exhaust gas of the heat exchanger in the prior art contains liquid refrigerant and causes the problem that the compressor cannot work normally due to liquid suction, a heat exchanger and a heat exchange system are provided, in which a liquid separation cavity is arranged in the shell to collide and separate the gas-liquid mixture to avoid liquid suction of the compressor.

[0006] A heat exchanger comprises:

[0007] A shell, wherein a liquid inlet and an exhaust port are arranged on the shell;

[0008] A liquid separation structure is arranged in the shell, and the liquid separation structure separates the shell into a heat exchange cavity and an exhaust cavity, the liquid inlet is communicated with the heat exchange cavity, and the exhaust port is communicated with the exhaust cavity;

[0009] The liquid distribution structure is provided with a liquid distribution cavity, an air inlet and an air outlet, the liquid distribution cavity is communicated with the heat exchange cavity through the air inlet, and the liquid distribution cavity is communicated with the exhaust cavity through the air outlet.

[0010] The air inlet and the air outlet are arranged in a staggered manner.

[0011] The heat exchanger further comprises a baffle plate, the baffle plate is arranged in the liquid distribution cavity, the air inlet is located on one side of the baffle plate, and the air outlet is located on the other side of the baffle plate.

[0012] The number of the air inlets is multiple, all the air inlets are arranged in at least one column, and the straight line where each column of the air inlets is located is parallel to the plane where the baffle plate is located.

[0013] The number of the air outlets is multiple, all the air outlets are arranged in at least one column, and the straight line where each column of the air outlets is located is parallel to the plane where the baffle plate is located.

[0014] The baffle plate is arranged on the top surface of the liquid distribution cavity, and there is a spacing between the lower end of the baffle plate and the bottom surface of the liquid distribution cavity.

[0015] The air inlet is located at the connecting position of the liquid distribution structure and the inner wall of the shell, and the air outlet is located at the middle part of the liquid distribution structure.

[0016] The liquid distribution structure is provided with a liquid discharge port, the bottom of the liquid distribution cavity is provided with a liquid storage area, and the liquid storage area is communicated with the heat exchange cavity through the liquid discharge port.

[0017] The top surface of the liquid distribution structure is recessed inwardly to form a liquid storage groove in the liquid distribution cavity, and the liquid storage groove is communicated with the liquid storage area.

[0018] The heat exchanger further comprises a liquid return pipe, a first end of the liquid return pipe is communicated with the liquid storage area, and a second end of the liquid return pipe is communicated with the liquid storage groove.

[0019] The heat exchanger further comprises a first liquid blocking plate, the first liquid blocking plate is arranged at the opening of the liquid storage groove, and the first liquid blocking plate is provided with a first liquid passing channel.

[0020] The liquid distribution structure comprises a second liquid blocking plate and a third liquid blocking plate, the third liquid blocking plate is located between the second liquid blocking plate and the air outlet, the third liquid blocking plate, the second liquid blocking plate and the inner wall of the shell jointly form the liquid distribution cavity, the third liquid blocking plate is provided with the air outlet, and the second liquid blocking plate is provided with the air inlet.

[0021] The cross section of the second liquid baffle is curved, and the recessed part on the second liquid baffle forms the liquid storage area; and / or the cross section of the third liquid baffle is curved, and the recessed part on the third liquid baffle forms the liquid storage groove.

[0022] The lowest point of the recessed part on the second liquid baffle is provided with a first liquid discharge port, and the liquid distribution cavity communicates with the heat exchange cavity through the first liquid discharge port.

[0023] The lowest point of the recessed part on the third liquid baffle is provided with a second liquid discharge port, the exhaust cavity communicates with the liquid distribution cavity through the second liquid discharge port, and the second end of the liquid return pipe communicates with the second liquid discharge port.

[0024] The heat exchanger further comprises a fourth liquid baffle provided in the liquid storage area, the fourth liquid baffle is provided with a fourth liquid passing channel, and the first end of the liquid return pipe communicates with the fourth liquid passing channel.

[0025] The heat exchanger further comprises a support plate, the upper end of the support plate is provided on the third liquid baffle, the lower end of the support plate is provided on the second liquid baffle, the upper half of the support plate is provided with a support gas passing hole, and the lower half of the support plate is provided with a support liquid passing hole.

[0026] The relationship between the flow area S1 of the support gas passing hole and the flow area S2 of the support liquid passing hole is 10S2≤S1≤20S2.

[0027] The number of the gas inlets is at least two, and the relationship between the sum S3 of the flow areas of all the gas inlets and the flow area S4 of the gas outlet is 5S4≤S3≤20S3.

[0028] A heat exchange system comprising the heat exchanger.

[0029] The heat exchanger and the heat exchange system provided by the application utilize the liquid distribution structure to divide the shell into the relatively sealed heat exchange cavity and the exhaust cavity, so that the gaseous refrigerant generated in the heat exchange cavity must pass through the liquid distribution cavity of the liquid distribution structure and flow in the liquid distribution cavity, and in the process, the gaseous refrigerant collides with the inner wall of the liquid distribution cavity and is folded, in which process, the gaseous refrigerant can flow out of the liquid distribution cavity smoothly, and the liquid refrigerant is collected in the process of collision and folding and separated from the gaseous refrigerant, so that the liquid refrigerant in the gaseous refrigerant entering the exhaust cavity is basically separated, and a small amount of liquid refrigerant is separated again when passing through the gas outlet due to the sudden change of area, thereby ensuring the purity of the gaseous refrigerant discharged through the gas outlet, effectively overcoming the problem of liquid suction of the compressor in the prior art, and ensuring the reliable operation of the heat exchange system. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1A partial cross-sectional view of the heat exchanger provided by the embodiment of the present application;

[0031] Figure 2 A semi-cross-sectional schematic view of the heat exchanger provided by the embodiment of the present application;

[0032] Figure 3 A structural schematic view of the second liquid baffle of the heat exchanger provided by the embodiment of the present application;

[0033] Figure 4 A structural schematic view of the third liquid baffle of the heat exchanger provided by the embodiment of the present application;

[0034] Figure 5 A structural schematic view of the support plate of the heat exchanger provided by the embodiment of the present application;

[0035] Figure 6 A structural schematic view of the baffle of the heat exchanger provided by the embodiment of the present application;

[0036] Figure 7 A structural schematic view of the first liquid baffle of the heat exchanger provided by the embodiment of the present application;

[0037] Figure 8 A structural schematic view of the fourth liquid baffle of the heat exchanger provided by the embodiment of the present application;

[0038] In the figure:

[0039] 1, shell; 11, liquid inlet; 12, exhaust port; 2, liquid separation structure; 13, heat exchange cavity; 14, exhaust cavity; 21, liquid separation cavity; 22, air inlet; 23, air outlet; 3, baffle; 24, liquid storage area; 25, liquid storage groove; 4, liquid return pipe; 26, first liquid baffle; 261, first liquid passage; 27, second liquid baffle; 28, third liquid baffle; 271, first liquid outlet; 281, second liquid outlet; 29, fourth liquid baffle; 291, fourth liquid passage; 5, support plate; 51, support air hole; 52, support liquid hole; 6, shell support. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0041] In the following, the technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, so that those skilled in the art can better understand the technical solutions of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work should fall within the protection scope of the present application.

[0042] It should be noted that the terms "first", "second" and the like in the description of the present application and the above drawings are used to distinguish similar objects, and do not necessarily indicate or imply a specific order or sequence. It should be understood that the terms thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily limit to those clearly listed steps or units, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0043] It should be noted that in the description of the present application, the terms "up", "down", "left", "right", "inner", "outer" and the like indicating the direction or positional relationship of the terms are based on the direction or positional relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0044] In addition, it should be noted that in the description of the present application, unless otherwise specified and limited, the terms "mounting", "setting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0045] The prior art full-liquid evaporator is generally composed of a water chamber, a tube plate, a shell, heat exchange tubes, a support, a liquid inlet and an exhaust outlet. The heat exchange tubes are totally immersed in the refrigerant, so that the refrigerant can exchange heat with the medium in the tubes. At this time, the refrigerant will boil and exchange heat outside the heat exchange tubes. After absorbing heat, the refrigerant is vaporized from liquid refrigerant to gaseous refrigerant, and is finally discharged from the liquid surface of the liquid refrigerant, and then is discharged from the exhaust outlet, so as to realize phase change heat exchange of the refrigerant. During the rising process of the gaseous refrigerant, the gaseous refrigerant will wrap the liquid into the exhaust outlet. When the compressor inhales from the exhaust outlet, the liquid wrapped by the gaseous refrigerant will enter the compressor, causing the problem of liquid suction of the compressor. Therefore, the application provides a heat exchanger as shown in Figures 1 to 8 The heat exchanger, in particular to a full-liquid evaporator, comprises a shell 1, a liquid inlet 11 and an exhaust outlet 12 are arranged on the shell 1; a liquid separation structure 2 is arranged in the shell 1, and the liquid separation structure 2 separates the shell 1 into a heat exchange cavity 13 and an exhaust cavity 14, the liquid inlet 11 is communicated with the heat exchange cavity 13, and the exhaust outlet 12 is communicated with the exhaust cavity 14; a liquid separation cavity 21 is formed in the liquid separation structure 2, an air inlet 22 and an air outlet 23 are arranged on the liquid separation structure 2, the liquid separation cavity 21 is communicated with the heat exchange cavity 13 through the air inlet 22, and the liquid separation cavity 21 is communicated with the exhaust cavity 14 through the air outlet 23. The shell 1 is separated into the relatively sealed heat exchange cavity 13 and the exhaust cavity 14 by the liquid separation structure 2, so that the gaseous refrigerant generated in the heat exchange cavity 13 must pass through the liquid separation cavity 21 of the liquid separation structure 2 and flow in the liquid separation cavity 21, and collide and flow in the process, so that the gaseous refrigerant can flow out of the liquid separation cavity 21, and the liquid refrigerant is separated from the gaseous refrigerant in the process of collision and flow, so that the liquid refrigerant in the gaseous refrigerant in the exhaust cavity 14 is basically separated, and a small amount of liquid refrigerant is separated again when passing through the air outlet 23 due to the sudden change of area, so as to ensure the purity of the gaseous refrigerant discharged from the exhaust outlet 12, effectively overcome the problem of liquid suction of the compressor in the prior art, and ensure the working reliability of the heat exchange system.

[0046] In order to improve the separation effect of the liquid separation structure 2 on the gaseous refrigerant and the liquid refrigerant (hereinafter referred to as gas-liquid mixture), and improve the collision and flow effect of the gas-liquid mixture in the liquid separation structure 2, the air inlet 22 and the air outlet 23 are arranged in a staggered manner. The gas-liquid mixture entering from the air inlet 22 will directly impact the inner wall of the liquid separation cavity 21 corresponding to the air inlet 22 to collide, and then continuously flow in the liquid separation cavity 21, and finally be discharged from the air outlet 23. In this process, the gas-liquid mixture entering from the air inlet 22 will not be directly discharged through the air outlet 23, effectively improving the separation effect of the liquid separation structure 2, and further improving the purity of the gaseous refrigerant in the exhaust of the heat exchanger, and ensuring the working reliability of the compressor and the heat exchange system.

[0047] Furthermore, the heat exchanger also includes a baffle plate 3, which is disposed within the liquid separation chamber 21. Due to the staggered arrangement of the air inlet 22 and the air outlet 23, the air inlet 22 is located on one side of the baffle plate 3, and the air outlet 23 is located on the other side. When the gas-liquid mixture entering through the air inlet 22 enters the liquid separation chamber 21, it directly impacts the inner wall of the chamber corresponding to the air inlet 22. The impacted gas-liquid mixture is then deflected by the baffle plate 3, ensuring effective separation of the gas-liquid mixture, increasing the flow distance of the gas-liquid mixture, and effectively improving the separation effect of the liquid separation structure 2.

[0048] like Figure 1 As shown in the figure, the shell 1 is cylindrical, and the liquid separation structure 2 is arranged along the length of the cylinder. Therefore, in order to ensure uniform air intake in the liquid separation chamber 21, there are multiple air inlets 22. All air inlets 22 are arranged in at least one row, and the straight line of each row of air inlets 22 is parallel to the plane of the baffle plate 3. At this time, the distance between the air inlet 22 and the adjacent baffle plate 3 is equal, ensuring that the airflow entering from each air inlet 22 collides with the top surface of the liquid separation chamber 21 and flows the same distance to reach the baffle plate 3. This avoids mutual interference between airflows due to different distances, ensures the collision separation effect of the gas-liquid mixture, and improves the separation effect of the liquid separation structure 2.

[0049] Similarly, there are multiple air outlets 23, all arranged in at least one row, with the straight line of each row of air outlets 23 parallel to the plane of the baffle plate 3. Using multiple air outlets 23 ensures that the gaseous refrigerant separated in the liquid distribution chamber 21 can flow smoothly into the exhaust chamber 14, while also preventing the flow area of ​​a single air outlet 23 from being too large, which could cause liquid refrigerant droplets to be carried out by the gaseous refrigerant, affecting the purity of the gaseous refrigerant discharged from the heat exchanger.

[0050] Since the heat exchange chamber 13 is located below the exhaust chamber 14, the gas-liquid mixture will enter the liquid separation chamber 21 from below the liquid separation structure 2. Therefore, the air inlet 22 of the liquid separation structure 2 is set at the bottom of the liquid separation chamber 21. At this time, the gas-liquid mixture entering through the air inlet 22 will directly impact the top surface of the liquid separation chamber 21, and part of the gas-liquid mixture will flow directly along the top surface of the liquid separation chamber 21 to the air outlet 23. Therefore, the baffle 3 is set on the top surface of the liquid separation chamber 21, and there is a gap between the lower end of the baffle 3 and the bottom surface of the liquid separation chamber 21. After the gas-liquid mixture collides with the top surface of the liquid separation chamber 21, the baffle 3 will restrict the gas-liquid mixture from flowing to the bottom surface of the liquid separation chamber 21, and it can only flow to the air outlet 23 after passing through the gap, thus ensuring the baffle effect and separation effect of the gas-liquid mixture.

[0051] As an implementation, the air inlet 22 is located at the connection position of the distribution structure 2 and the inner wall of the shell 1, and the air outlet 23 is located at the middle of the distribution structure 2. The inner wall of the shell 1 is used for guiding flow, so that the gas-liquid mixture can flow into the distribution cavity 21 more smoothly, and the gas-liquid mixture generated in the middle of the heat exchange cavity 13 flows upward and collides with the lower side wall of the distribution structure 2 for separation, and then flows to the inner walls of the two sides of the shell 1, thereby further improving the separation effect of the heat exchanger on the gas-liquid mixture.

[0052] Since the gas-liquid mixture collides and separates in the distribution cavity 21, liquid refrigerant is accumulated in the distribution cavity 21. The distribution structure 2 is provided with a liquid discharge port, the bottom of the distribution cavity 21 is provided with a liquid storage area 24, the liquid storage area 24 is communicated with the heat exchange cavity 13 through the liquid discharge port, and the accumulated liquid refrigerant is stored in the liquid storage area 24 and flows back to the heat exchange cavity 13 through the liquid discharge port for heat exchange again.

[0053] Meanwhile, a small amount of liquid refrigerant is separated again when passing through the air outlet 23 due to the sudden change of area, and the liquid refrigerant is accumulated in the exhaust cavity 14. In order to avoid the influence of the liquid refrigerant on the gaseous refrigerant in the exhaust cavity 14 (such as mixing of the liquid refrigerant into the gaseous refrigerant to reduce the purity of the gaseous refrigerant, blocking the air outlet 23 to affect the flow rate and flow of the gaseous refrigerant, etc.), the top surface of the distribution structure 2 is recessed to form a liquid storage groove 25 inside the distribution cavity 21, and the liquid storage groove 25 is communicated with the liquid storage area 24. The liquid refrigerant separated in the exhaust cavity 14 is accumulated in the liquid storage groove 25 and flows into the liquid storage area 24 smoothly, and then flows back to the heat exchange cavity 13 through the liquid discharge port, thereby ensuring the purity of the gaseous refrigerant discharged by the heat exchanger.

[0054] The heat exchanger further comprises a liquid return pipe 4, a first end of the liquid return pipe 4 is communicated with the liquid storage area 24, and a second end of the liquid return pipe 4 is communicated with the liquid storage groove 25. The liquid return pipe 4 is used for guiding the liquid refrigerant in the liquid storage groove 25 to flow into the liquid storage area 24, so that the liquid refrigerant in the liquid storage groove 25 is not wrapped by the gas-liquid mixture in the distribution cavity 21, and the separation effect of the distribution cavity 21 on the gas-liquid mixture is ensured.

[0055] Since a large amount of gaseous refrigerant enters the exhaust cavity 14, it will affect the liquid level of the liquid refrigerant in the liquid storage groove 25, and even cannot block the connection hole between the liquid storage groove 25 and the liquid return pipe 4. The heat exchanger further comprises a first liquid blocking plate 26, the first liquid blocking plate 26 is arranged at the opening of the liquid storage groove 25, and the first liquid blocking plate 26 is provided with a first liquid passing channel 261. The first liquid blocking plate 26 is used for reducing the disturbance of the gaseous refrigerant to the liquid level of the liquid refrigerant in the liquid storage groove 25, ensuring the reliability of the liquid return of the liquid storage groove 25, and the first liquid passing channel 261 is arranged to ensure that the liquid refrigerant can flow into the liquid storage groove 25 smoothly.

[0056] The first liquid-passing channel 261 is arranged at the edge of the first liquid-blocking plate 26, and when the edge of the first liquid-blocking plate 26 is in abutting cooperation with the liquid storage groove 25, the liquid coolant can flow along the surface of the concave liquid separation structure 2 and flow into the liquid storage groove 25 through the first liquid-passing channel 261, thereby ensuring the collection effect of the liquid storage groove 25.

[0057] As an embodiment, the liquid separation structure 2 comprises a second liquid-blocking plate 27 and a third liquid-blocking plate 28, the third liquid-blocking plate 28 is located between the second liquid-blocking plate 27 and the exhaust port 12, the third liquid-blocking plate 28, the second liquid-blocking plate 27 and the inner wall of the shell 1 jointly form the liquid separation cavity 21, the third liquid-blocking plate 28 is provided with the air outlet 23, and the second liquid-blocking plate 27 is provided with the air inlet 22. That is, the second liquid-blocking plate 27 forms the bottom plate of the liquid separation cavity 21, and the third liquid-blocking plate 28 forms the top plate of the liquid separation cavity 21, wherein the edge of the second liquid-blocking plate 27 and the edge of the third liquid-blocking plate 28 are both sealingly arranged with the inner wall of the shell 1, so as to ensure that the gas-liquid mixture in all the heat exchange cavities 13 can only flow into the exhaust cavity 14 through the second liquid-blocking plate 27 and the third liquid-blocking plate 28, thereby ensuring the separation effect and facilitating installation and maintenance.

[0058] The second liquid-blocking plate 27 is in a curved surface, and the concave part on the second liquid-blocking plate 27 forms the liquid storage area 24. The liquid coolant separated in the liquid separation cavity 21 can flow into the liquid storage area 24 under the guidance of the curved surface, thereby ensuring the reliable collection of the liquid coolant, and the curved surface of the second liquid-blocking plate 27 can further increase the collision effect between the gas-liquid mixture and the second liquid-blocking plate 27, thereby improving the separation effect of the liquid separation structure 2. Moreover, the lower surface of the second liquid-blocking plate 27 faces the heat exchange cavity 13, and at this time, the concave part on the second liquid-blocking plate 27 is equivalent to a convex structure formed inside the heat exchange cavity 13. After the gas-liquid mixture in the heat exchange cavity 13 collides with the second liquid-blocking plate 27, part of the liquid coolant will be adsorbed on the second liquid-blocking plate 27. Since the second liquid-blocking plate 27 is in a curved surface, at this time, the part of the liquid coolant will flow along the curved surface of the second liquid-blocking plate 27 and gather and drop on the convex structure, thereby further improving the separation effect of the liquid separation structure 2.

[0059] Similarly, the third liquid-blocking plate 28 is in a curved surface, and the concave part on the third liquid-blocking plate 28 forms the liquid storage groove 25. The liquid coolant separated in the exhaust cavity 14 can flow into the liquid storage groove 25 under the guidance of the curved surface, thereby ensuring the reliable collection of the liquid coolant, and the curved surface of the first liquid-blocking plate 26 can further increase the collision effect between the gas-liquid mixture and the first liquid-blocking plate 26, thereby improving the separation effect of the liquid separation structure 2.

[0060] Of course, the cross section of the second liquid baffle 27 and the cross section of the third liquid baffle 28 are both curved surfaces, and the second liquid baffle 27 and the third liquid baffle 28 are opposite and parallel at any position, which ensures that the flow area in the distribution cavity 21 is uniform, and the cooperation with the baffle 3 can realize the effect of gradual change of flow area. The gas-liquid mixture will change in flow rate and flow area during the flow process, thereby improving the separation effect.

[0061] The curved surface can be wavy, zigzag or composed of a plurality of concave curved segments and a plurality of convex curved segments, all the concave curved segments and all the convex curved segments are arranged at intervals to increase the area of the curved surface as much as possible, thereby increasing the flow distance of the gas-liquid mixture and the separation effect. The shape of the concave curved segment can be V-shaped or U-shaped, and the shape of the convex curved segment can be inverted V-shaped or inverted U-shaped.

[0062] In order to ensure the smooth return flow of the liquid refrigerant in the distribution cavity 21, the lowest point of the concave part of the second liquid baffle 27 is provided with a first liquid discharge port 271, and the distribution cavity 21 communicates with the heat exchange cavity 13 through the first liquid discharge port 271. The first liquid discharge port 271 can guide all the liquid refrigerant in the liquid storage area 24 into the heat exchange cavity 13, wherein the height of the first liquid discharge port 271 is lower than the height of the gas inlet 22, so as to avoid the influence between the gas flow of the gas inlet 22 and the liquid refrigerant discharged from the first liquid discharge port 271, and ensure the reliable work of the heat exchanger.

[0063] Similarly, the lowest point of the concave part of the third liquid baffle 28 is provided with a second liquid discharge port 281, the exhaust cavity 14 communicates with the distribution cavity 21 through the second liquid discharge port 281, and the second end of the liquid return pipe 4 communicates with the second liquid discharge port 281. The second liquid discharge port 281 can guide all the liquid refrigerant in the liquid storage groove 25 into the distribution cavity 21, wherein the height of the second liquid discharge port 281 is lower than the height of the gas outlet 23, so as to avoid the influence of the gas flow of the gas outlet 23 on the liquid level in the liquid storage groove 25, thereby preventing the problem of short circuit of the second liquid discharge port 281, and ensuring the reliable work of the heat exchanger.

[0064] Since the gas-liquid separator needs to collide and fold in the separation cavity 21, part of the gas-liquid mixture will flow through the liquid level of the liquid storage area, which will cause the liquid level of the liquid storage area to fluctuate, the first liquid discharge port 271 to be exposed, and the gas return problem, therefore, the heat exchanger further comprises a fourth liquid baffle plate 29, the fourth liquid baffle plate 29 is arranged in the liquid storage area 24, the fourth liquid baffle plate 29 is provided with a fourth liquid passage 291, and the first end of the liquid return pipe 4 is communicated with the fourth liquid passage 291. The fourth liquid baffle plate 29 protects the liquid level of the liquid storage area 24, preventing the disturbance of the gas-liquid mixture to the liquid level, and at the same time, the first end of the liquid return pipe 4 is communicated with the fourth liquid passage 291, which can make the liquid coolant returned by the liquid return pipe 4 flow smoothly into the liquid storage area 24, ensuring the reliability of the liquid return of the liquid return pipe 4.

[0065] The fourth liquid passage 291 is arranged at the edge of the fourth liquid baffle plate 29, and when the edge of the fourth liquid baffle plate 29 is in abutting cooperation with the liquid storage area 24, the liquid coolant can flow smoothly along the surface of the second liquid baffle plate 27 and flow into the liquid storage area 24 through the fourth liquid passage 291, ensuring the collection effect of the liquid storage tank 25, and the fourth liquid passage 291 further comprises a connecting hole located in the middle of the fourth liquid baffle plate 29, the first end of the liquid return pipe 4 is fixedly connected with the connecting hole, ensuring the reliable fixation of the liquid return pipe 4, and at the same time, the liquid coolant in the liquid return pipe 4 can flow smoothly into the liquid storage area 24 through the connecting hole, ensuring the reliability of the liquid return of the liquid return pipe 4.

[0066] The heat exchanger further comprises a support plate 5, the upper end of the support plate 5 is arranged on the third liquid baffle plate 28, the lower end of the support plate 5 is arranged on the second liquid baffle plate 27, and the upper half of the support plate 5 is provided with a support gas passage 51, and the lower half of the support plate 5 is provided with a support liquid passage 52. The support plate 5 supports the second liquid baffle plate 27 and the third liquid baffle plate 28, realizes the reliable connection between the second liquid baffle plate 27 and the third liquid baffle plate 28, and at the same time, the support plate 5 can also serve the purpose of deflection of the gas-liquid mixture, the gaseous coolant can flow through the support gas passage 51, and the liquid coolant can only flow through the support liquid passage 52, ensuring the separation effect.

[0067] In order to facilitate the installation between the second liquid baffle plate 27, the third liquid baffle plate 28 and the shell 1, the shell support 6 is arranged on the inner wall of the shell 1, and the second liquid baffle plate 27 can be directly placed on the shell support 6, at this time the second liquid baffle plate 27 can be reliably installed on the shell 1, and then the third liquid baffle plate 28 is connected with the second liquid baffle plate 27 under the action of the support plate 5, thereby realizing the reliable fixation of the liquid separation structure 2 and the shell 1.

[0068] The relationship between the flow area S1 of the support gas passage hole 51 and the flow area S2 of the support liquid passage hole 52 is 10S2≤S1≤20S2. When S1 is less than 10S2, the flow area of the gaseous refrigerant is too small, the pressure loss increases, and the gaseous refrigerant may flow from the support liquid passage hole 52, affecting the separation effect. When S1 is greater than 20S2, the flow area of the gaseous refrigerant is too large, and the gas-liquid mixture may flow directly through the support gas passage hole 51, also affecting the separation effect. Therefore, only when 10S2≤S1≤20S2 can reliable separation of the gas-liquid mixture be ensured. The number of support gas passage holes 51 is multiple, and the flow area S1 refers to the sum of the flow areas of all support gas passage holes 51. Similarly, the number of support liquid passage holes 52 is multiple, and the flow area S2 refers to the sum of the flow areas of all support liquid passage holes 52. The flow area of each support gas passage hole 51 and the flow area of each support liquid passage hole 52 are relatively small, avoiding the gas-liquid mixture flowing directly through and affecting the separation effect.

[0069] As an embodiment, the support gas passage hole 51 is located at the upper edge of the support plate 5, and the support liquid passage hole 52 is located at the lower edge of the support plate 5, maximizing the separation effect between the gaseous refrigerant and the liquid refrigerant.

[0070] In order to realize the reliable connection of the support plate 5 and the second liquid blocking plate 27 and the third liquid blocking plate 28, the second liquid blocking plate 27 and the third liquid blocking plate 28 are provided with support plate mounting holes, and the support plate 5 is provided with support plate protrusions corresponding to the support plate mounting holes. The support plate protrusions can be inserted into the corresponding support plate mounting holes, and the support plate protrusions can be sealingly matched with the support plate mounting holes to avoid leakage.

[0071] Similarly, in order to realize the reliable connection between the baffle plate 3 and the third liquid blocking plate 28, the third liquid blocking plate 28 is further provided with a baffle plate mounting hole, and the upper edge of the baffle plate 3 is provided with a baffle plate 3 protrusion. The baffle plate 3 protrusion can be inserted into the corresponding baffle plate mounting hole and sealingly matched with the baffle plate mounting hole to avoid leakage.

[0072] The number of gas inlets 22 is at least two, and the sum of the flow areas S3 of all the gas inlets 22 and the flow area S4 of the gas outlet 12 satisfy the relationship 5S4≤S3≤20S4. When S3 is less than 5S4, the flow area of the gaseous refrigerant is too small, the pressure loss increases, and the flow rate of the gaseous refrigerant at the gas inlet 22 is large, which still carries out part of the liquid refrigerant, the purity of the gaseous refrigerant at the gas outlet 12 is low, and the compressor still has the problem of liquid entrainment. When S3 is greater than 20S4, the flow rate of the gaseous refrigerant at the gas inlet 22 is reduced, and the collision and separation effect of the gas-liquid mixture in the liquid separation chamber 21 is poor, affecting the separation effect. Therefore, only when 5S4≤S3≤20S4 can reliable separation of the gas-liquid mixture be ensured.

[0073] A heat exchange system comprising the heat exchanger.

[0074] The above embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as limiting the scope of the patent of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, several modifications and improvements can be made, which belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A heat exchanger, characterized by: The application relates to a heat exchanger. The heat exchanger comprises a shell (1) provided with a liquid inlet (11) and an exhaust port (12); a liquid separation structure (2) arranged in the shell (1) and separating the shell (1) into a heat exchange cavity (13) and an exhaust cavity (14), wherein the liquid inlet (11) is communicated with the heat exchange cavity (13), and the exhaust port (12) is communicated with the exhaust cavity (14); a separation cavity (21) formed in the liquid separation structure (2), wherein the liquid separation structure (2) is provided with a gas inlet (22) and a gas outlet (23), the separation cavity (21) is communicated with the heat exchange cavity (13) through the gas inlet (22), and the separation cavity (21) is communicated with the exhaust cavity (14) through the gas outlet (23); a liquid outlet is arranged on the liquid separation structure (2), the bottom of the separation cavity (21) is provided with a liquid storage area (24), and the liquid storage area (24) is communicated with the heat exchange cavity (13) through the liquid outlet; a liquid storage groove (25) is formed in the top surface of the liquid separation structure (2) and recessed towards the inside of the separation cavity (21), and the liquid storage groove (25) is communicated with the liquid storage area (24); the heat exchanger further comprises a first liquid blocking plate (26) arranged at the opening of the liquid storage groove (25), and the first liquid blocking plate (26) is provided with a first liquid passing channel (261). The gas inlet (22) and the gas outlet (23) are arranged in a staggered mode. The heat exchanger further comprises a baffle (3) arranged in the separation cavity (21), wherein the gas inlet (22) is located on one side of the baffle (3), and the gas outlet (23) is located on the other side of the baffle (3). The number of the gas inlets (22) is multiple, and all the gas inlets (22) are arranged in at least one column, and the straight line where each column of the gas inlets (22) is located is parallel to the plane where the baffle (3) is located. The number of the gas outlets (23) is multiple, and all the gas outlets (23) are arranged in at least one column, and the straight line where each column of the gas outlets (23) is located is parallel to the plane where the baffle (3) is located. The baffle (3) is arranged on the top surface of the separation cavity (21), and the lower end of the baffle (3) has a spacing with the bottom surface of the separation cavity (21).

2. The heat exchanger of claim 1, wherein: The gas inlet (22) is located at the connecting position of the liquid separation structure (2) and the inner wall of the shell (1), and the gas outlet (23) is located at the middle part of the liquid separation structure (2).

3. The heat exchanger according to claim 1 or 2, characterized in that: The heat exchanger further comprises a liquid return pipe (4) having a first end communicated with the liquid storage area (24) and a second end communicated with the liquid storage groove (25).

4. The heat exchanger of claim 3, wherein: ​ 5. The heat exchanger of claim 3, wherein: ​ 6. The heat exchanger of claim 3, wherein: ​ 7. The heat exchanger of claim 2, wherein: ​ 8. The heat exchanger of claim 1, wherein: ​ 9. The heat exchanger of claim 8, wherein: The liquid separation structure (2) comprises a second liquid baffle (27) and a third liquid baffle (28), the third liquid baffle (28) is located between the second liquid baffle (27) and the exhaust port (12), the third liquid baffle (28), the second liquid baffle (27) and the inner wall of the shell (1) jointly form the liquid separation cavity (21), the third liquid baffle (28) is provided with the gas outlet (23), and the second liquid baffle (27) is provided with the gas inlet (22).

10. The heat exchanger of claim 9, wherein: The second liquid baffle (27) is a curved surface in cross section, and the recessed part on the second liquid baffle (27) forms the liquid storage area (24); and / or the third liquid baffle (28) is a curved surface in cross section, and the recessed part on the third liquid baffle (28) forms the liquid storage groove (25).

11. The heat exchanger of claim 9, wherein: The lowest point of the recessed part on the second liquid baffle (27) is provided with a first liquid discharge port (271), and the liquid separation cavity (21) communicates with the heat exchange cavity (13) through the first liquid discharge port (271).

12. The heat exchanger of claim 9, wherein: The lowest point of the recessed part on the third liquid baffle (28) is provided with a second liquid discharge port (281), the exhaust cavity (14) communicates with the liquid separation cavity (21) through the second liquid discharge port (281), and the second end of the liquid return pipe (4) communicates with the second liquid discharge port (281).

13. The heat exchanger of claim 12, wherein: The heat exchanger further comprises a fourth liquid baffle (29), the fourth liquid baffle (29) is arranged in the liquid storage area (24), the fourth liquid baffle (29) is provided with a fourth liquid passing channel (291), and the first end of the liquid return pipe (4) communicates with the fourth liquid passing channel (291).

14. The heat exchanger of claim 9, wherein: The heat exchanger further comprises a support plate (5), the upper end of the support plate (5) is arranged on the third liquid baffle (28), the lower end of the support plate (5) is arranged on the second liquid baffle (27), the upper half of the support plate (5) is provided with a support gas passing hole (51), and the lower half of the support plate (5) is provided with a support liquid passing hole (52).

15. The heat exchanger of claim 14, wherein: The relationship between the flow area S1 of the support gas passing hole (51) and the flow area S2 of the support liquid passing hole (52) is 10S2≤S1≤20S2.

16. The heat exchanger of claim 1, wherein: The number of the gas inlets (22) is at least two, and the relationship between the sum S3 of the flow areas of all the gas inlets (22) and the flow area S4 of the exhaust port (12) is 5S4≤S3≤20S3.

17. A heat exchange system, characterized by: The heat exchanger according to any one of claims 1 to 16. The heat exchanger according to any one of claims 1 to 16.

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