Multi-flow plate heat exchanger

Abstract

The invention belongs to the technical field of heat exchangers, and discloses a multi-flow plate heat exchanger which comprises a fixed plate, a movable plate, a plurality of heat exchange pieces and a steering assembly, a first inlet and a second outlet are formed in the fixed plate, and a first outlet and a second inlet are formed in the movable plate; at least two groups of heat exchange sheets are arranged, and corner holes are formed in the corners of the heat exchange sheets, so that a first fluid channel or a second fluid channel is formed between the heat exchange sheets; the steering assembly is arranged between every two adjacent sets of heat exchange pieces and comprises a first steering piece, a second steering piece and a third steering piece which are sequentially arranged, a first channel hole is formed in the first steering piece, a second channel hole is formed in the second steering piece, and a third channel hole is formed in the third steering piece. And the first channel hole, the second channel hole and the third channel hole are respectively communicated with the first fluid channel or the second fluid channel. Therefore, the heat exchange efficiency and the structure utilization rate of the multi-flow plate heat exchanger can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchangers, and particularly to a multi-pass plate heat exchanger. Background Art

[0002] A heat exchanger is a device for realizing heat transfer between two or more fluids. As a common structural form, a plate heat exchanger is widely used in fields such as air conditioning, heating, chemical industry, and food processing.

[0003] In the milk cooling treatment industry, to improve the heat exchange efficiency, a multi-pass design is usually adopted to extend the heat exchange path. At the same time, by controlling the flow velocity between plates and enhancing the turbulent flow effect between plates, the heat exchange capacity is improved. To achieve support and commutation between processes, stainless steel plates need to be arranged between adjacent processes, thereby enhancing the pressure-bearing capacity and structural strength of the plate group.

[0004] However, since the head plate, the end plate of the plate group, and the stainless steel sheets for support and commutation between processes do not participate in heat exchange, the number of effective heat exchange channels is limited, affecting the overall heat exchange performance. And to ensure the sealing between plates, sealing treatments need to be carried out at the four corners of the head plate and the first heat exchange plate after commutation, increasing the manufacturing complexity and cost. Summary of the Invention

[0005] The purpose of the present invention is to provide a multi-pass plate heat exchanger to solve the problems of low heat exchange efficiency and low structural utilization rate of the multi-pass plate heat exchanger.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] A multi-flow plate heat exchanger comprises: a fixed plate and a movable plate, wherein the fixed plate is provided with a first inlet and a second outlet, and the movable plate is provided with a first outlet and a second inlet, so that a first fluid is transported to the first outlet through the first inlet and a second fluid is transported to the second outlet through the second inlet; a plurality of heat exchange fins, wherein the heat exchange fins are provided in at least two groups, and the plurality of heat exchange fins in the same group are arranged in sequence, and corner holes are provided on the corners of the heat exchange fins, so that a first fluid channel or a second fluid channel is formed between the heat exchange fins, the first inlet and the first outlet are connected to the first fluid channel, and the second inlet and the second outlet are connected to the second fluid channel; a steering assembly, wherein the steering assembly is provided between two adjacent groups of heat exchange fins, and comprises a first steering fin, a second steering fin, and a third steering fin arranged in sequence, the first steering fin having a first channel hole, the second steering fin having a second channel hole, and the third steering fin having a third channel hole, so as to change the flow direction of the first fluid or the second fluid, and the first channel hole, the second channel hole, and the third channel hole are connected to the first fluid channel or the second fluid channel, respectively.

[0008] Preferably, the heat exchange plate connected to the fixed plate is a head plate, and the positions of the head plate corresponding to the first inlet and the second outlet are provided with two corner holes; the heat exchange plate connected to the movable plate is a tail plate, and the positions of the tail plate corresponding to the first outlet and the second inlet are provided with two corner holes.

[0009] Preferably, the heat exchange fin connected to the side of the head fin away from the fixed plate is provided with three corner holes, and the heat exchange fin connected to the side of the tail fin away from the movable plate is provided with three corner holes.

[0010] Preferably, the multi-flow plate heat exchanger further includes a sealing assembly, which includes a first seal, a second seal and a third seal. The first seal is correspondingly arranged on the edges of the heat exchange plate, the first deflection plate, the second deflection plate and the third deflection plate. The second seal is arranged on the heat exchange plate, the first deflection plate, the second deflection plate and the third deflection plate, and is used to guide the first fluid to flow in the first fluid channel and the second fluid to flow in the second fluid channel. The second seal and the third seal are respectively arranged on both sides of the head plate.

[0011] Preferably, the first sealing member, the second sealing member, and the third sealing member are all sealing rubber gaskets.

[0012] Preferably, three first channel holes are formed in the first turning piece, two second channel holes are formed in the second turning piece, and three third channel holes are formed in the third turning piece.

[0013] Preferably, the three first channel holes of the first turning piece are respectively arranged at three corners of the first turning piece, the three third channel holes of the third turning piece are respectively arranged at three corners of the third turning piece, and the projections of two of the first channel holes and two of the third channel holes coincide along the arrangement direction of the first turning piece, the second turning piece, and the third turning piece.

[0014] Preferably, the four corners of the first turning piece are correspondingly provided with the first channel holes or first blind holes, the four corners of the second turning piece are correspondingly provided with the second channel holes or second blind holes, and the four corners of the third turning piece are correspondingly provided with the third channel holes or third blind holes.

[0015] Preferably, the first inlet and the second outlet are located at the same end of the fixed plate, and the first outlet and the second inlet are located at the same end of the movable plate.

[0016] Preferably, the heat exchange fins are provided with corrugations.

[0017] Advantages of the present invention:

[0018] A multi-pass plate heat exchanger includes a fixed plate, a movable plate, a plurality of heat exchange fins, and a turning assembly. A first inlet and a second outlet are formed in the fixed plate, and a first outlet and a second inlet are formed in the movable plate, so that a first fluid is conveyed from the first inlet to the first outlet, and a second fluid is conveyed from the second inlet to the second outlet; at least two groups of heat exchange fins are provided, and a plurality of heat exchange fins in the same group are arranged in sequence. Corner holes are formed at the corners of the heat exchange fins, so that a first fluid channel or a second fluid channel is formed between the heat exchange fins. The first inlet, the first outlet are communicated with the first fluid channel, and the second inlet, the second outlet are communicated with the second fluid channel; the turning assembly is arranged between two adjacent groups of heat exchange fins. The turning assembly includes a first turning piece, a second turning piece, and a third turning piece arranged in sequence. A first channel hole is formed in the first turning piece, a second channel hole is formed in the second turning piece, and a third channel hole is formed in the third turning piece to change the flow direction of the first fluid or the second fluid. The first channel hole, the second channel hole, and the third channel hole are respectively communicated with the first fluid channel or the second fluid channel.

[0019] Thus, the first fluid and the second fluid enter the first fluid passage and the second fluid passage respectively through the first inlet and the second inlet, and heat exchange is achieved. By providing a turning component, the flow direction of the fluid can be changed and the heat exchange path can be extended. Since the first fluid and the second fluid can continue to participate in heat exchange within the turning component, the number of effective heat exchange channels can be increased, the overall heat exchange performance can be improved, and thus the heat exchange efficiency and structural utilization rate of the multi-pass plate heat exchanger can be enhanced. Description of the Drawings

[0020] Figure 1 is a schematic structural diagram of a fixed plate and a movable plate in an embodiment of the present invention;

[0021] Figure 2 is a schematic structural diagram of a multi-pass plate heat exchanger in an embodiment of the present invention;

[0022] Figure 3 is a schematic structural diagram of a header plate in an embodiment of the present invention.

[0023] In the figure:

[0024] 1, fixed plate; 11, first inlet; 12, second outlet; 2, movable plate; 21, first outlet; 22, second inlet; 3, heat exchange fin; 31, corner hole; 32, header plate; 33, end plate; 4, turning component; 41, first turning fin; 411, first channel hole; 412, first blind hole; 42, second turning fin; 421, second channel hole; 422, second blind hole; 43, third turning fin; 431, third channel hole; 432, third blind hole; 5, sealing component; 51, first seal; 52, second seal; 53, third seal. Detailed Description of the Embodiment

[0025] The present invention will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. Additionally, it should be noted that for the sake of description, only parts related to the present invention are shown in the drawings, rather than all the structures in the drawings.

[0026] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In the present invention, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include direct contact between the first and second features, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is less than that of the second feature.

[0028] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0029] Referring to Figure 1 and Figure 2 , the present invention provides a multi - flow plate heat exchanger, which includes a fixed plate 1, a movable plate 2, a plurality of heat exchange fins 3 and a steering assembly 4. A first inlet 11 and a second outlet 12 are formed on the fixed plate 1, and a first outlet 21 and a second inlet 22 are formed on the movable plate 2, so that the first fluid is conveyed from the first inlet 11 to the first outlet 21, and the second fluid is conveyed from the second inlet 22 to the second outlet 12; at least two groups of heat exchange fins 3 are provided, and a plurality of heat exchange fins 3 in the same group are arranged in sequence. Corner holes 31 are formed at the corners of the heat exchange fins 3, so as to form a first fluid channel (not shown in the figure) or a second fluid channel (not shown in the figure) between the heat exchange fins 3. The first inlet 11, the first outlet 21 are communicated with the first fluid channel, and the second inlet 22, the second outlet 12 are communicated with the second fluid channel; the steering assembly 4 is arranged between two adjacent groups of heat exchange fins 3. The steering assembly 4 includes a first steering fin 41, a second steering fin 42 and a third steering fin 43 arranged in sequence. A first channel hole 411 is formed on the first steering fin 41, a second channel hole 421 is formed on the second steering fin 42, and a third channel hole 431 is formed on the third steering fin 43, so as to change the flow direction of the first fluid or the second fluid. The first channel hole 411, the second channel hole 421 and the third channel hole 431 are respectively communicated with the first fluid channel or the second fluid channel.

[0030] In this embodiment, the fixed plate 1, the movable plate 2, and the heat exchange fins 3 are all vertically arranged. There are two groups of heat exchange fins 3, and each group includes seven heat exchange fins 3. One group of heat exchange fins 3 connected to the fixed plate 1 is the first process, and one group of heat exchange fins 3 connected to the movable plate 2 is the second process. The turning assembly 4 is arranged between the first process and the second process, so that the flow directions of the first fluid and the second fluid between adjacent two groups of heat exchange fins 3 are opposite; the first turning fin 41 is connected to the last heat exchange fin 3 of the first process, and the third turning fin 43 is connected to the first heat exchange fin 3 of the second process. The first fluid flows through the second channel hole 421, and the second fluid flows through the first channel hole 411 and the third channel hole 431. That is, the first channel hole 411 and the third channel hole 431 are communicated with the second fluid channel, and the second channel hole 421 is communicated with the first fluid channel.

[0031] In this way, the first fluid and the second fluid respectively enter the first fluid channel and the second fluid channel through the first inlet 11 and the second inlet 22 to achieve heat exchange. The turning assembly 4 can change the flow direction of the fluid to extend the heat exchange path, and by opening the first channel hole 411, the second channel hole 421, and the third channel hole 431, the turning assembly 4 can participate in heat exchange. Compared with the stainless steel plate that does not participate in heat exchange, it can increase the number of effective heat exchange channels, improve the overall heat exchange performance, and improve the heat exchange efficiency and structural utilization rate of the multi-process plate heat exchanger.

[0032] It can be understood that the number of groups of heat exchange fins 3 and the number of heat exchange fins 3 in each group can be adjusted according to actual heat exchange needs, and will not be listed in detail here.

[0033] Refer to Figure 2 and Figure 3 , in some embodiments, the heat exchange fin 3 connected to the fixed plate 1 is the head fin 32, and two corner holes 31 are correspondingly opened at the positions of the head fin 32 corresponding to the first inlet 11 and the second outlet 12. The heat exchange fin 3 connected to the movable plate 2 is the end fin 33, and two corner holes 31 are correspondingly opened at the positions of the end fin 33 corresponding to the first outlet 21 and the second inlet 22.

[0034] In this way, the corner holes 31 of the head fin 32 are correspondingly arranged with the first inlet 11 and the second inlet 22 on the fixed plate 1, and the end fin 33 is correspondingly arranged with the first outlet 21 and the second inlet 22 on the movable plate 2, which can guide the first fluid and the second fluid to enter the first fluid channel and the second fluid channel respectively for heat exchange, avoid the mixing of the first fluid and the second fluid, and improve the heat exchange efficiency and structural utilization rate.

[0035] Refer to Figure 2In some embodiments, the heat exchange fin 3 connected to the side of the head fin 32 facing away from the fixed plate 1 (i.e., the second heat exchange fin 3 of the first group of heat exchange fins 3) is provided with three corner holes 31, and the heat exchange fin 3 connected to the side of the last fin 33 facing away from the movable plate 2 (i.e., the second to last heat exchange fin 3 of the second group of heat exchange fins 3) is provided with three corner holes 31.

[0036] In this embodiment, the three corner holes 31 of the heat exchange plate 3 connected to the head plate 32 on the side away from the fixed plate 1 are respectively opened at the corner of the upper right corner, the corner of the lower left corner and the corner of the lower right corner, and the three corner holes 31 of the heat exchange plate 3 connected to the end plate 33 on the side away from the movable plate 2 are respectively opened at the corner of the upper left corner, the corner of the lower left corner and the corner of the lower right corner, and the four corners of the heat exchange plate 3 located between the heat exchange plate 3 connected to the head plate 32 on the side away from the fixed plate 1 and the steering assembly 4, and between the steering assembly 4 and the heat exchange plate 3 connected to the end plate 33 on the side away from the movable plate 2 are all provided with corner holes 31.

[0037] In this way, a first fluid channel or a second fluid channel can be formed between the heat exchange plates 3 through the corner holes 31, so as to facilitate heat exchange between the first fluid and the second fluid, and the first deflection plate 41, the second deflection plate 42, and the third deflection plate 43 can all participate in the heat exchange, thereby increasing the number of effective heat exchange channels, so that the first fluid and the second fluid can achieve sufficient heat exchange, thereby improving the heat exchange efficiency and structural utilization of the multi-flow plate heat exchanger.

[0038] It can be understood that the positions of the corner holes 31 on the heat exchange plate 3 connected to the head plate 32 away from the fixed plate 1 and the corner holes 31 on the heat exchange plate 3 connected to the end plate 33 away from the movable plate 2 can be adjusted according to actual needs, which will not be elaborated here.

[0039] See Figure 2 and Figure 3 In some embodiments, the multi-pass plate heat exchanger further includes a sealing assembly 5, which includes a first seal 51, a second seal 52, and a third seal 53. The first seal 51 is correspondingly disposed on the edges of the heat exchange fin 3, the first deflector fin 41, the second deflector fin 42, and the third deflector fin 43. The second seal 52 is disposed on the heat exchange fin 3, the first deflector fin 41, the second deflector fin 42, and the third deflector fin 43, and is used to guide the first fluid to flow in the first fluid channel and the second fluid to flow in the second fluid channel. The second seal 52 and the third seal 53 are respectively disposed on either side of the head fin 32. Furthermore, in some embodiments, the first seal 51, the second seal 52, and the third seal 53 are all sealing rubber gaskets.

[0040] In this embodiment, the first seal 51 is arranged around the corner of the heat exchange fin 3 to prevent the first fluid or the second fluid from leaking outside the heat exchange fin 3. The second seal 52 is arranged at the corner on the same side of the heat exchange fin 3, and the second seals 52 on adjacent heat exchange fins 3 are respectively arranged on different sides, so that the first fluid and the second fluid flow between adjacent heat exchange fins 3, preventing the first fluid and the second fluid from mixing.

[0041] In this way, by arranging the third seal 53 on the header plate 32, double sealing can be achieved, preventing the first fluid and the second fluid from leaking to the outside. Since the first turning fin 41, the second turning fin 42, and the third turning fin 43 all participate in heat exchange, only a single layer of sealing needs to be set, which can save manufacturing costs and enable the multi-pass plate heat exchanger to maintain good sealing performance, improving the safety and stability of the multi-pass plate heat exchanger.

[0042] It can be understood that the first seal 51, the second seal 52, and the third seal 53 can also be structures such as welded parts and sealing plates, as long as they can achieve the sealing performance, and no more examples will be listed here.

[0043] Refer to Figure 2 , in some embodiments, the first turning fin 41 is provided with three first channel holes 411, the second turning fin 42 is provided with two second channel holes 421, and the third turning fin 43 is provided with three third channel holes 431.

[0044] It should be noted that the flow direction of the first fluid between the first turning fin 41 and the second turning fin 42 is the same as the flow direction of the first fluid between the first group of heat exchange fins 3 and opposite to the flow direction of the first fluid between the second group of heat exchange fins 3. The flow direction of the second fluid between the first turning fin 41 and the last heat exchange fin 3 of the first group is the same as the flow direction of the first fluid between the first group of heat exchange fins 3 and opposite to the flow direction of the second fluid between the second turning fin 42 and the third turning fin 43 and the flow direction of the second fluid between the second group of heat exchange fins 3.

[0045] In this way, the first turning fin 41, the second turning fin 42, and the third turning fin 43 can achieve the conversion of the flow direction of the first fluid and the flow direction of the second fluid, extend the heat exchange path, save the setting of the sealing gasket, reduce the production cost, and enable the first turning fin 41, the second turning fin 42, and the third turning fin 43 to all participate in heat exchange, increasing the number of effective heat exchange channels and improving the heat exchange efficiency and structural utilization rate of the multi-pass plate heat exchanger.

[0046] Refer to Figure 2, in some embodiments, the three first channel holes 411 of the first turning piece 41 are respectively arranged at three corner parts of the first turning piece 41, and the three third channel holes 431 of the third turning piece 43 are respectively arranged at three corner parts of the third turning piece 43. Along the arrangement direction of the first turning piece 41, the second turning piece 42, and the third turning piece 43, the projections of two first channel holes 411 and two third channel holes 431 coincide.

[0047] In this embodiment, the three first channel holes 411 are respectively arranged at the corner parts of the upper left corner, the upper right corner, and the lower left corner of the first turning piece 41, and the third channel holes 431 are respectively arranged at the corner parts of the upper left corner, the upper right corner, and the lower right corner of the third turning piece 43.

[0048] In this way, the first turning piece 41, the second turning piece 42, and the third turning piece 43 can all participate in heat exchange, increasing the number of effective heat exchange channels, improving the overall heat exchange performance, and under the action of the first seal 51 and the second seal 52, it can prevent the first fluid and the second fluid from mixing and the first fluid and the second fluid from leaking to the outside of the heat exchange fin 3, reducing the manufacturing complexity and manufacturing cost, and improving the heat exchange efficiency and structural utilization rate of the heat exchanger.

[0049] It can be understood that the arrangement positions of the first channel hole 411, the second channel hole 421, and the third channel hole 431 can be adjusted according to the actual heat exchange path design, as long as it can achieve changing the flow directions of the first fluid and the second fluid, and no more examples are listed here.

[0050] Refer to Figure 2 , in some embodiments, first channel holes 411 or first blind holes 412 are correspondingly arranged at four corner parts of the first turning piece 41, second channel holes 421 or second blind holes 422 are correspondingly arranged at four corner parts of the second turning piece 42, and third channel holes 431 or third blind holes 432 are correspondingly arranged at four corner parts of the third turning piece 43. That is, first blind holes 412 are arranged at the corner parts of the first turning piece 41 where the first channel holes 411 are not arranged, second blind holes 422 are arranged at the corner parts of the second turning piece 42 where the second channel holes 421 are not arranged, and third blind holes 432 are arranged at the corner parts of the third turning piece 43 where the third channel holes 431 are not arranged.

[0051] In this embodiment, the first blind hole 412 is arranged at the corner part of the lower right corner of the first turning piece 41, the second blind hole 422 is arranged at the corner parts of the lower left corner and the lower right corner of the second turning piece 42, and the third blind hole 432 is arranged at the corner part of the lower left corner of the third turning piece 43.

[0052] In this way, the provision of the first blind hole 412, the second blind hole 422 and the third blind hole 432 can increase the pressure resistance of the first steering plate 41, the second steering plate 42 and the third steering plate 43, thereby preventing the large impact force generated during the steering process of the first fluid and the second fluid from causing damage to the first steering plate 41, the second steering plate 42 and the third steering plate 43, and improving the structural utilization rate of the multi-flow plate heat exchanger.

[0053] It is understandable that the locations and depths of the first blind hole 412 , the second blind hole 422 , and the third blind hole 432 can be adjusted according to actual needs, and are not listed in detail here.

[0054] See Figure 2 In some embodiments, the first inlet 11 and the second outlet 12 are located at the same end of the fixed plate 1 , and the first outlet 21 and the second inlet 22 are located at the same end of the movable plate 2 .

[0055] In this embodiment, the first inlet 11 and the second outlet 12 are both located at the bottom end of the fixed plate 1 , and the first outlet 21 and the second inlet 22 are both located at the bottom end of the movable plate 2 .

[0056] In this way, the first fluid enters the first fluid channel through the first inlet 11 at the bottom, and the second fluid enters the second fluid channel through the second inlet 22 at the bottom, so that heat exchange can be performed from bottom to top, extending the heat exchange time and improving the heat exchange efficiency.

[0057] See Figure 2 In some embodiments, the heat exchange plate 3 is provided with corrugations (not shown in the figure).

[0058] In this embodiment, refer to Figure 2 The arrows above the heat exchanger fins 3 and the steering assembly 4 are the directions of the corrugations. The first steering fin 41, the second steering fin 42 and the third steering fin 43 are all provided with corrugations, and the directions of the corrugations provided on adjacent heat exchanger fins 3 are opposite.

[0059] In this way, the corrugations can guide the flow of the first fluid or the second fluid, extend the heat exchange time and the heat exchange path, and provide corrugations on the first steering plate 41, the second steering plate 42, and the third steering plate 43, so that they can participate in the heat exchange while improving the heat exchange efficiency, thereby improving the structural utilization rate of the multi-flow plate heat exchanger.

[0060] It is understandable that the direction of the corrugations can be adjusted according to actual needs, and no further details are given here.

[0061] Obviously, the above embodiments of the present invention are merely examples given to clearly illustrate the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. A multi-flow plate heat exchanger, characterized in that, include: A fixed plate (1) and a movable plate (2), wherein the fixed plate (1) is provided with a first inlet (11) and a second outlet (12), and the movable plate (2) is provided with a first outlet (21) and a second inlet (22), so that a first fluid is transported to the first outlet (21) through the first inlet (11), and a second fluid is transported to the second outlet (12) through the second inlet (22); A plurality of heat exchange fins (3), wherein the heat exchange fins (3) are provided in at least two groups, and the plurality of heat exchange fins (3) in the same group are arranged in sequence, and corner holes (31) are provided on the corners of the heat exchange fins (3) so as to form a first fluid channel or a second fluid channel between the heat exchange fins (3), the first inlet (11) and the first outlet (21) are in communication with the first fluid channel, and the second inlet (22) and the second outlet (12) are in communication with the second fluid channel; A steering assembly (4), the steering assembly (4) being arranged between two adjacent groups of the heat exchange fins (3), the steering assembly (4) comprising a first steering fin (41), a second steering fin (42), and a third steering fin (43) arranged in sequence, the first steering fin (41) being provided with a first channel hole (411), the second steering fin (42) being provided with a second channel hole (421), and the third steering fin (43) being provided with a third channel hole (431), so as to change the flow direction of the first fluid or the second fluid, the first channel hole (411), the second channel hole (421), and the third channel hole (431) being respectively connected to the first fluid channel or the second fluid channel.

2. The multi-pass plate heat exchanger according to claim 1, characterized in that, The heat exchange fin (3) connected to the fixed plate (1) is a head fin (32), and the head fin (32) has two corner holes (31) corresponding to positions of the first inlet (11) and the second outlet (12). The heat exchange fin (3) connected to the movable plate (2) is a tail fin (33), and the tail fin (33) has two corner holes (31) corresponding to positions of the first outlet (21) and the second inlet (22).

3. The multi-pass plate heat exchanger according to claim 2, wherein, The heat exchange plate (3) connected to the side of the head plate (32) facing away from the fixed plate (1) is provided with three corner holes (31), and the heat exchange plate (3) connected to the side of the tail plate (33) facing away from the movable plate (2) is provided with three corner holes (31).

4. The multi-flow plate heat exchanger according to claim 2, characterized in that, The multi - flow plate heat exchanger further includes a sealing assembly (5). The sealing assembly (5) includes a first seal (51), a second seal (52), and a third seal (53). The first seal (51) is correspondingly arranged at the edges of the heat exchange fins (3), the first turning fin (41), the second turning fin (42), and the third turning fin (43). The second seal (52) is arranged on the heat exchange fins (3), the first turning fin (41), the second turning fin (42), and the third turning fin (43) for guiding the first fluid to flow in the first fluid channel and the second fluid to flow in the second fluid channel. The second seal (52) and the third seal (53) are respectively arranged on both sides of the header plate (32).

5. The multi-pass plate heat exchanger according to claim 4, characterized in that, The first seal (51), the second seal (52), and the third seal (53) are all sealing rubber gaskets.

6. The multi-pass plate heat exchanger according to claim 1, characterized in that, The first turning fin (41) is provided with three first channel holes (411), the second turning fin (42) is provided with two second channel holes (421), and the third turning fin (43) is provided with three third channel holes (431).

7. The multi-pass plate heat exchanger according to claim 6, characterized in that, The three first channel holes (411) of the first turning fin (41) are respectively arranged at the three corners of the first turning fin (41). The three third channel holes (431) of the third turning fin (43) are respectively arranged at the three corners of the third turning fin (43). Along the arrangement direction of the first turning fin (41), the second turning fin (42), and the third turning fin (43), the projections of two of the first channel holes (411) coincide with the projections of two of the third channel holes (431).

8. The multi-pass plate heat exchanger according to claim 7, wherein, Four corners of the first turning fin (41) are correspondingly provided with the first channel holes (411) or first blind holes (412). Four corners of the second turning fin (42) are correspondingly provided with the second channel holes (421) or second blind holes (422). Four corners of the third turning fin (43) are correspondingly provided with the third channel holes (431) or third blind holes (432).

9. The multi-pass plate heat exchanger according to any one of claims 1-8, characterized in that, The first inlet (11) and the second outlet (12) are located at the same end of the fixed plate (1). The first outlet (21) and the second inlet (22) are located at the same end of the movable plate (2).

10. The multi-pass plate heat exchanger according to any one of claims 1-8, characterized in that, The heat exchange fins (3) are provided with corrugations.

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