Labyrinth type brazed plate heat exchanger

Abstract

The invention provides a labyrinth type brazed plate heat exchanger which comprises a front end plate, a rear end plate and a plurality of runner plate sets, refrigerant cavities and heating medium cavities which are arranged at intervals are formed between the runner plate sets, a heating medium inlet and a refrigerant inlet are formed in the front end plate, the heating medium inlet is communicated with the heating medium cavities, the heating medium cavities are communicated with the adjacent heating medium cavities through heating medium inlet holes, and the refrigerant inlet holes are communicated with the adjacent heating medium cavities. The heating medium inlet holes in the adjacent heating medium cavities are located in the upper end and the lower end of the runner plate set respectively, the refrigerant inlets are communicated with the refrigerant cavities, the refrigerant cavities are communicated with the adjacent refrigerant cavities through the refrigerant inlet holes, and the refrigerant inlet holes in the adjacent refrigerant cavities are located in the upper end and the lower end of the runner plate set respectively. According to the labyrinth type brazed plate heat exchanger, series flow of a heating medium and a refrigerant between the runner plate sets along the labyrinth type runners can be achieved, so that the flow of the runners is kept stable, the flow ratio of the runners can be adjusted, the distance of the heating medium and the refrigerant passing through the runner plate sets is longer, and the heat exchange efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchangers, in particular to a labyrinth brazing plate heat exchanger. Background Art

[0002] Existing brazed plate heat exchangers consist of multiple layers of uniform, thin metal plates connected by a brazing process. The plates are typically made of stainless steel and feature a herringbone corrugated pattern embossed on the surface to increase the heat transfer area and enhance fluid cross-flow. Fluid channels are formed in the spaces between the plates, through which hot and cold fluids alternate, typically with one fluid flowing in odd-numbered channels and the other in even-numbered channels. Heat is transferred between the plates, and the hot and cold fluids exchange heat through the plates. Because the plates are very thin and have good thermal conductivity, heat can be efficiently transferred from the hot fluid to the cold fluid. The corrugated design on the plate surface enhances fluid turbulence, improves heat transfer efficiency, and reduces the formation of scale. However, the inter-plate flow channels of brazed plate heat exchangers currently on the market are narrow (only about 0.8 to 2 mm). If the medium contains particles or fiber impurities, it is easy to clog, reducing heat exchange efficiency and increasing system resistance. Regular cleaning or the installation of a filter device is required. In addition, the flow channel pressure is uneven, which easily leads to inconsistent pressures at the front and rear ends of the heat exchanger, resulting in poor heat exchange efficiency. The flow channels between the hot and cold plates are the same width, and the flow ratio of the two flow channels cannot be adjusted. Increasing the width of the inter-plate flow channel will cause the rear end of the heat exchanger to lose pressure and achieve poor heat exchange effect. With the popularization of new energy vehicles, traditional brazed plate heat exchangers have poor heat exchange performance in car batteries and air conditioners, especially when used in condensers and evaporators. The cooling effect is poor and the pressure drop ratio is fast. When used in new energy vans, the existing heat exchangers will experience excessively high return liquid temperatures, which can cause compressor damage or shutdown, also affecting cooling. Summary of the Invention

[0003] (1) Technical issues to be resolved

[0004] The problem to be solved by the present invention is to provide a labyrinth brazed plate heat exchanger to overcome the defects of the prior art brazed plate heat exchanger, such as uneven flow channel pressure, inability to adjust the flow ratio of the flow channel, and poor heat exchange efficiency caused by short flow channels.

[0005] (2) Technical solution

[0006] In order to solve the technical problem, the present invention provides a labyrinth brazed plate heat exchanger, comprising a front end plate, a rear end plate and a plurality of flow channel plate groups arranged and installed between the front end plate and the rear end plate, wherein a refrigerant cavity and a heat medium cavity are formed between the flow channel plate groups, and the refrigerant cavity and the heat medium cavity do not circulate with each other, and a heat medium inlet and a refrigerant inlet are provided on the front end plate, the heat medium inlet is connected to the heat medium cavity, and the heat medium cavity is connected to adjacent heat medium cavities through heat medium inlet holes, and the heat medium inlet holes on adjacent heat medium cavities are respectively located at the upper end and the lower end of the flow channel plate group, and the heat medium inlet hole connecting the heat medium cavity of the front end plate and the heat medium inlet are respectively located at the upper end and the lower end of the heat exchanger At the lower end, the refrigerant inlet is connected to the refrigerant cavity, and the refrigerant cavity is connected to the adjacent refrigerant cavity through the refrigerant inlet hole. The refrigerant inlet holes on the adjacent refrigerant cavities are respectively located at the upper end and the lower end of the flow channel plate group, and the refrigerant inlet hole connected to the refrigerant cavity of the front end plate and the refrigerant inlet are respectively located at the upper end and the lower end of the heat exchanger; the flow channel plate group includes a first flow channel plate and a second flow channel plate, the refrigerant cavity is formed between the front end of the second flow channel plate and the first flow channel plate, and the heat medium cavity is formed between the front end of the first flow channel plate and the second flow channel plate, the refrigerant inlet holes on the adjacent refrigerant cavities are diagonally arranged, and the heat medium inlet holes on the adjacent heat medium cavities are diagonally arranged.

[0007] In some embodiments, a refrigerant outlet and a heat medium outlet are further provided on the front end plate, and the refrigerant cavities are connected through a refrigerant outlet hole, and the refrigerant outlet hole and the refrigerant outlet are both located on the same center line, and the refrigerant inlet hole and the refrigerant outlet hole of the terminal refrigerant cavity are respectively located at the upper and lower ends of the flow channel plate group, and the heat medium cavities are connected through a heat medium outlet hole, and the heat medium outlet hole and the heat medium outlet are both located on the same center line, and the heat medium inlet hole and the heat medium outlet hole of the terminal heat medium cavity are respectively located at the upper and lower ends of the flow channel plate group.

[0008] In some embodiments, the front end surface of the first flow channel plate is concave to form the heat medium cavity, and the front end surface of the second flow channel plate is concave to form the coolant cavity. The end surfaces of the coolant cavity and the heat medium cavity are both provided with raised welding points. The back surfaces of the first flow channel plate and the second flow channel plate are flat, and the welding points are welded to the back surfaces of the first flow channel plate and the second flow channel plate.

[0009] In some embodiments, the heat medium outlet holes are each provided with a first boss, which is in contact with the front connection surface; the refrigerant outlet holes are each provided with a second boss, which is in contact with the front connection surface.

[0010] In some embodiments, a third boss is provided on the refrigerant inlet of the first flow channel plate, and the third boss is fitted with the connecting surface on the front side. A raised seat is provided on the heat medium inlet of the second flow channel plate, and the raised seat is fitted with the connecting surface on the front side. A flow channel gasket is also provided on the first flow channel plate connected to the front end plate, and the flow channel gasket is fitted at the heat medium inlet.

[0011] (3) Beneficial effects

[0012] The present invention provides a labyrinth-type brazed plate heat exchanger, which can realize the cross-flow of heat medium and refrigerant along the labyrinth-type flow channels between each flow channel plate group through the heat medium inlet holes and refrigerant inlet holes staggered in the heat medium cavity and the refrigerant cavity, and the refrigerant inlet holes and the bosses on the heat medium inlet holes separate the heat medium and refrigerant flow channels to avoid mutual interference. The cross-flow method keeps the flow rate of the flow channel stable, and the flow rate ratio of the flow channel can be adjusted. In addition, the distance that the heat medium and refrigerant pass through the flow channel plate group is longer, thereby improving the heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0014] Figure 1 This is an exploded view of a labyrinth brazed plate heat exchanger according to the present invention;

[0015] Figure 2 This is a three-dimensional diagram of the second flow channel plate of a labyrinth brazed plate heat exchanger of the present invention;

[0016] Figure 3 This is a three-dimensional diagram of the first flow channel plate of a labyrinth brazed plate heat exchanger of the present invention.

[0017] The names of the components corresponding to the various figure marks in the figure are: 1. Front end plate; 2. Rear end plate; 3. First flow channel plate; 4. Second flow channel plate; 5. Refrigerant cavity; 6. Heat medium cavity; 7. Heat medium inlet; 8. Refrigerant inlet; 9. Heat medium inlet hole; 10. Refrigerant inlet hole; 11. Refrigerant outlet; 12. Heat medium outlet; 13. Refrigerant outlet hole; 14. Heat medium outlet hole; 15. Welding point; 16. First boss; 17. Second boss; 18. Third boss; 19. Boss seat; 20. Flow channel gasket. DETAILED DESCRIPTION

[0018] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0019] The following describes the embodiments of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the features in the following embodiments and embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of this application.

[0020] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on this application, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspect described herein can be used to implement an apparatus and / or practice a method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this apparatus and / or practice this method.

[0021] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The illustrations only show components related to the present application and are not drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complicated.

[0022] Additionally, in the following description, specific details are provided to provide a thorough understanding of the examples, however, one skilled in the art will appreciate that the examples can be practiced without these specific details.

[0023] See Figures 1 to 3The present invention provides a labyrinth brazed plate heat exchanger, comprising a front end plate 1, a rear end plate 2, and a plurality of flow channel plate groups arranged and installed between the front end plate 1 and the rear end plate 2, wherein a refrigerant cavity 5 and a heat medium cavity 6 are formed between the flow channel plate groups, and the refrigerant cavity 5 and the heat medium cavity 6 do not flow between each other; specifically, the flow channel plate group comprises a first flow channel plate 3 and a second flow channel plate 4, a refrigerant cavity 5 is formed between the front end of the second flow channel plate 4 and the first flow channel plate 3, and a heat medium cavity 6 is formed between the front end of the first flow channel plate 3 and the second flow channel plate 4, wherein The front end surface of the first flow channel plate 3 is concave to form a heat medium cavity 6, and the front end surface of the second flow channel plate 4 is concave to form a refrigerant cavity 5; in this embodiment, a heat medium inlet 7 and a refrigerant inlet 8 are provided on the front end plate 1, the heat medium inlet 7 is connected to the heat medium cavity 6, and the heat medium cavity 6 is connected to the adjacent heat medium cavity 6 through the heat medium inlet hole 9, and the heat medium inlet holes 9 on the adjacent heat medium cavity 6 are respectively located at the upper end and the lower end of the flow channel plate group, the heat medium inlet hole 9 and the heat medium inlet 7 connecting the heat medium cavity 6 of the front end plate 1 are respectively located at the upper end and the lower end of the heat exchanger, and the refrigerant inlet 8 is connected to the refrigerant Cavity 5, the refrigerant cavity 5 is connected to the adjacent refrigerant cavity 5 through the refrigerant inlet hole 10, the refrigerant inlet holes 10 on the adjacent refrigerant cavity 5 are respectively located at the upper end and the lower end of the flow channel plate group, and the refrigerant inlet hole 10 and the refrigerant inlet 8 of the refrigerant cavity 5 connected to the front end plate 1 are respectively located at the upper end and the lower end of the heat exchanger; Specifically, the refrigerant inlet holes 10 on the adjacent refrigerant cavity 5 are diagonally arranged, and the heat medium inlet holes 9 on the adjacent heat medium cavity 6 are diagonally arranged, that is, the refrigerant passes through the first first flow channel plate 3 through the refrigerant inlet 8 and enters the first refrigerant cavity 5, and in the cold After diagonally flowing in the medium cavity 5, the heat medium passes through the refrigerant inlet holes 10 of the first flow channel plate 3 and the second flow channel plate 4 to enter the next refrigerant cavity 5, while the heat medium passes through the first flow channel plate 3 and the second flow channel plate 4 through the heat medium inlet 7 and enters the first heat medium cavity 6. After flowing diagonally in the heat medium cavity 6, the heat medium passes through the heat medium inlet holes 9 of the first flow channel plate 3 and the second flow channel plate 4 and enters the next heat medium cavity 6, thereby realizing a labyrinthine and direct current passage of the refrigerant and the heat medium, making the flow of the refrigerant and the heat medium stable, and the contact area with the flow channel plate group is large, and the heat exchange efficiency is high.

[0024] In some embodiments, as Figures 1 to 3As shown, a refrigerant outlet 11 and a heat medium outlet 12 are further provided on the front end plate 1, and the refrigerant cavities 5 are connected through the refrigerant outlet hole 13, and the refrigerant outlet hole 13 and the refrigerant outlet 11 are located on the same center line, and the refrigerant inlet hole 10 and the refrigerant outlet hole 13 of the terminal refrigerant cavity 5 are respectively located at the upper and lower ends of the flow channel plate group, and the heat medium cavities 6 are connected through the heat medium outlet hole 14, and the heat medium outlet hole 14 and the heat medium outlet 12 are respectively located at the upper and lower ends of the flow channel plate group, and the heat medium inlet hole 9 and the heat medium outlet hole 14 of the terminal heat medium cavity 6 are respectively located at the upper and lower ends of the flow channel plate group, and the heat medium flows to the last heat medium cavity 6 and then flows downward to the heat medium outlet hole 14, passes through all the flow channel plate groups in a straight line and then flows out from the heat medium outlet 12, and the refrigerant flows to the last refrigerant cavity 5 and then flows downward It flows to the refrigerant outlet 13, passes through all the flow channel plate groups in a straight line, and then flows out from the refrigerant outlet 13; in this embodiment, the end faces of the refrigerant cavity 5 and the heat medium cavity 6 are provided with raised welding points 15, the back sides of the first flow channel plate 3 and the second flow channel plate 4 are flat, the welding points 15 are welded to the back sides of the first flow channel plate 3 and the second flow channel plate 4, and the adjacent first flow channel plates 3, the second flow channel plates 4 and the front end plate 1 and the rear end plate 2 are sealed and welded through the welding points, and the heat medium outlet 14 is provided with a first boss 16, the first boss 16 is fitted with the connecting surface on the front side, and the refrigerant outlet 13 is provided with a second boss 17, the second boss 17 is fitted with the connecting surface on the front side, and a heat medium outlet 14 of each flow channel plate group is formed The heat medium outlet channel is separated from the heat medium cavity 6 and the refrigerant cavity 5 by the first boss 16, so that the heat medium can be discharged directly from the heat medium outlet 12, and a refrigerant outlet channel is formed between the refrigerant outlet holes 13 of each flow channel plate group, and the channel is separated from the refrigerant cavity 5 and the heat medium cavity 6 by the second boss 17, so that the refrigerant can be discharged directly from the refrigerant outlet 11; in this embodiment, the refrigerant inlet hole 10 of the first flow channel plate 3 is provided with a third boss 18, and the third boss 18 is in contact with the front connection surface. The third boss 18 separates the refrigerant cavity 5 from the heat medium cavity 6, so that the refrigerant in the refrigerant cavity 5 can only enter the next refrigerant cavity 5 directly through the refrigerant inlet hole 10, and will not overflow into the heat medium cavity around the refrigerant inlet hole 10 6, a raised seat 19 is provided on the heat medium inlet hole 9 of the second flow channel plate 4, and the raised seat 19 is fitted with the connecting surface on the front side. The raised seat 19 also separates the refrigerant cavity 5 from the heat medium cavity 6, so that the heat medium can only directly enter the next heat medium cavity 6 through the heat medium inlet hole 9, and will not overflow into the refrigerant cavity 5 around the heat medium inlet hole 9. A flow channel gasket 20 is also provided on the first flow channel plate 3 connected to the front end plate 1, and the flow channel gasket 20 is fitted at the heat medium inlet 7. The flow channel gasket 20 and the second boss 17 on the first flow channel plate 3 at the front end are fitted and sealed with the front end plate 1, so that the heat medium and the refrigerant can only directly enter the heat medium cavity 6 or the refrigerant cavity 5 through the first flow channel plate 3, and will not overflow between the first flow channel plate 3 and the front end plate 1.

[0025] The present invention provides a labyrinth-type brazed plate heat exchanger, which can realize the cross-flow of heat medium and refrigerant along the labyrinth-type flow channels between each flow channel plate group through the heat medium inlet holes and refrigerant inlet holes staggered in the heat medium cavity and the refrigerant cavity, and the refrigerant inlet holes and the bosses on the heat medium inlet holes separate the heat medium and refrigerant flow channels to avoid mutual interference. The cross-flow method keeps the flow rate of the flow channel stable, and the flow rate ratio of the flow channel can be adjusted. In addition, the distance that the heat medium and refrigerant pass through the flow channel plate group is longer, thereby improving the heat exchange efficiency.

[0026] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A labyrinth brazed plate heat exchanger comprising a front end plate (1), a rear end plate (2), and a plurality of flow channel plate groups arranged and installed between the front end plate (1) and the rear end plate (2), characterized in that: A refrigerant cavity (5) and a heat medium cavity (6) are formed between the flow channel plate groups. The refrigerant cavity (5) and the heat medium cavity (6) do not circulate with each other. A heat medium inlet (7) and a refrigerant inlet (8) are provided on the front end plate (1). The heat medium inlet (7) is connected to the heat medium cavity (6). The heat medium cavity (6) is connected to the adjacent heat medium cavity (6) through the heat medium inlet hole (9). The heat medium inlet holes (9) on the adjacent heat medium cavities (6) are respectively located at the upper end and the lower end of the flow channel plate group, and are connected to the front end plate (1). The heat medium inlet hole (9) of the heat medium cavity (6) and the heat medium inlet (7) are respectively located at the upper end and the lower end of the heat exchanger, the refrigerant inlet (8) is connected to the refrigerant cavity (5), and the refrigerant cavity (5) is connected to the adjacent refrigerant cavity (5) through the refrigerant inlet hole (10), and the refrigerant inlet holes (10) on the adjacent refrigerant cavities (5) are respectively located at the upper end and the lower end of the flow channel plate group, and the refrigerant inlet hole (10) of the refrigerant cavity (5) connected to the front end plate (1) and the refrigerant inlet (8) are respectively located at the upper end and the lower end of the heat exchanger.

2. The labyrinth brazed plate heat exchanger according to claim 1, characterized in that: The flow channel plate group includes a first flow channel plate (3) and a second flow channel plate (4), the refrigerant cavity (5) is formed between the front end of the second flow channel plate (4) and the first flow channel plate (3), and the heat medium cavity (6) is formed between the front end of the first flow channel plate (3) and the second flow channel plate (4).

3. The labyrinth brazed plate heat exchanger according to claim 1, wherein: The front end plate (1) is also provided with a refrigerant outlet (11) and a heat medium outlet (12), and the refrigerant chambers (5) are connected through a refrigerant outlet hole (13), and the refrigerant outlet hole (13) and the refrigerant outlet (11) are both located on the same center line. The refrigerant inlet hole (10) and the refrigerant outlet hole (13) of the terminal refrigerant chamber (5) are respectively located at the upper and lower ends of the flow channel plate group, and the heat medium chambers (6) are connected through a heat medium outlet hole (14), and the heat medium outlet hole (14) and the heat medium outlet (12) are both located on the same center line. The heat medium inlet hole (9) and the heat medium outlet hole (14) of the terminal heat medium chamber (6) are respectively located at the upper and lower ends of the flow channel plate group.

4. The labyrinth brazed plate heat exchanger according to claim 2, wherein: The front end surface of the first flow channel plate (3) is concave to form the heat medium cavity (6), and the front end surface of the second flow channel plate (4) is concave to form the coolant cavity (5).

5. The labyrinth brazed plate heat exchanger according to claim 4, characterized in that: The end faces of the refrigerant cavity (5) and the heat medium cavity (6) are both provided with raised welding points (15); the back surfaces of the first flow channel plate (3) and the second flow channel plate (4) are planes; the welding points (15) are welded to the back surfaces of the first flow channel plate (3) and the second flow channel plate (4).

6. The labyrinth brazed plate heat exchanger according to claim 3, characterized in that: The heat medium outlet holes (14) are each provided with a first boss (16), and the first boss (16) is in contact with the front connection surface.

7. The labyrinth brazed plate heat exchanger according to claim 3, characterized in that: The refrigerant outlet holes (13) are each provided with a second boss (17), and the second boss (17) is in contact with the front connection surface.

8. The labyrinth brazed plate heat exchanger according to claim 2, characterized in that: A third boss (18) is provided on each of the refrigerant inlet holes (10) of the first flow channel plate (3), and the third boss (18) is fitted with the front connection surface.

9. The labyrinth brazed plate heat exchanger according to claim 2, wherein: The heat medium inlet holes (9) of the second flow channel plate (4) are each provided with a raised seat (19), and the raised seat (19) is fitted with the front connection surface.

10. The labyrinth brazed plate heat exchanger according to claim 2, characterized in that: The refrigerant inlet holes (10) on the adjacent refrigerant cavities (5) are diagonally arranged, and the heat medium inlet holes (9) on the adjacent heat medium cavities (6) are diagonally arranged. A flow channel gasket (20) is also provided on the first flow channel plate (3) connected to the front end plate (1), and the flow channel gasket (20) is attached to the heat medium inlet (7).

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