Plate heat exchanger

Abstract

The utility model discloses a plate heat exchanger, and relates to the technical field of heat exchangers. The plate heat exchanger comprises a plurality of first plates and a plurality of second plates. The multiple first plates and the multiple second plates are sequentially arranged in an overlapped mode, a first heat exchange flow channel is formed between the first plate and one adjacent second plate, a second heat exchange flow channel is formed between the first plate and the other adjacent second plate, the first heat exchange flow channel is used for heat exchange medium circulation, and the second heat exchange flow channel is used for heat exchange medium circulation. The first heat exchange flow channel comprises a first flow channel section and a second flow channel section which are communicated with each other, and the section height of the first flow channel section is larger than that of the second flow channel section. Compared with the prior art, due to the fact that the first flow channel section with the section height larger than that of the second flow channel section is adopted in the plate heat exchanger, the bad problem caused in the gas-liquid two-phase conversion process of heat exchange media can be solved, the heat exchange efficiency is improved, and the heat exchange effect is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchangers, and in particular to a plate heat exchanger. Background Art

[0002] A plate heat exchanger is a high-efficiency heat exchanger composed of a series of stacked plates, with flow channels formed between the plates. The flow channels include a first heat exchange channel and a second heat exchange channel that are alternately arranged in sequence. The first heat exchange channel is used to circulate a heat exchange medium (refrigerant, etc.), and the second heat exchange channel is used to circulate the fluid to be heat exchanged. The fluid to be heat exchanged and the heat exchange medium exchange heat through the plates. Now the height of the first heat exchange channel in the plate heat exchanger is equal everywhere, and the refrigerant will transform between the gas and liquid phases during the flow and heat exchange process. Since the density of the liquid refrigerant is much greater than that of the gas refrigerant, the volume of the gas refrigerant of the same mass is much greater than that of the liquid refrigerant. Therefore, during the mutual transformation of the liquid refrigerant and the gas refrigerant, the volume of the refrigerant will change, resulting in a change in the flow resistance of the refrigerant. The flow rate of the refrigerant changes synchronously, which directly affects the heat exchange efficiency.

[0003] In view of this, it is particularly important to design and manufacture a plate heat exchanger with good heat exchange effect, especially in heat exchanger production. Utility Model Content

[0004] The purpose of the utility model is to provide a plate heat exchanger that can solve the adverse problems caused by the mutual transformation of the heat exchange medium between the gas and liquid phases, improve the heat exchange efficiency, and ensure the heat exchange effect.

[0005] The present invention is achieved by adopting the following technical solutions.

[0006] A plate heat exchanger includes multiple first plates and multiple second plates, which are arranged in sequence overlapping each other, and a first heat exchange channel is formed between the first plate and an adjacent second plate, and a second heat exchange channel is formed between the first plate and another adjacent second plate, wherein the first heat exchange channel is used for the circulation of heat exchange medium, and at least part of the first heat exchange channel includes a first channel section and a second channel section that are interconnected, and the cross-sectional height of the first channel section is greater than the cross-sectional height of the second channel section.

[0007] Optionally, the first flow channel section and the second flow channel section are arranged in sequence along the length direction of the first plate, and the length of the first flow channel section is less than or equal to the length of the second flow channel; or, the first flow channel section and the second flow channel section are arranged in sequence along the width direction of the first plate, and the width of the first flow channel section is less than or equal to the width of the second flow channel.

[0008] Optionally, the first plate includes a first main body portion, a connecting portion and a second main body portion connected in sequence, the first main body portion and the second main body portion are parallel and staggered in the height direction of the plate heat exchanger, the connecting portion is inclined to the first main body portion, the first main body portion and the connecting portion are both spaced apart from an adjacent second plate to form a first flow channel section, and the second main body portion is spaced apart from an adjacent second plate to form a second flow channel section.

[0009] Optionally, the second plate includes a third main body portion, an extension portion and a fourth main body portion connected in sequence, the third main body portion and the fourth main body portion are parallel and staggered in the height direction of the plate heat exchanger, the extension portion is arranged at an angle to the third main body portion, at least part of the first flow channel section is arranged between the third main body portion and the first main body portion, and at least part of the second flow channel section is arranged between the fourth main body portion and the second main body portion.

[0010] Optionally, the connecting portion and the extending portion have the same inclination angle and opposite inclination directions.

[0011] Optionally, the first plate further includes a surrounding edge portion, which is simultaneously arranged outside the first main body portion, the connecting portion and the second main body portion; the second plate further includes a retaining edge portion, which is fitted with the retaining edge portion and seal-welded.

[0012] Optionally, a first through-hole is provided at one end of the first flow channel section away from the second flow channel section, and a second through-hole is provided at one end of the second flow channel section away from the first flow channel section; when the plate heat exchanger is used as an evaporator, the second through-hole is used for the inflow of heat exchange medium, and the first through-hole is used for the outflow of heat exchange medium; when the plate heat exchanger is used as a condenser, the first through-hole is used for the inflow of heat exchange medium, and the second through-hole is used for the outflow of heat exchange medium.

[0013] Optionally, the second heat exchange channel includes a third channel section and a fourth channel section that are interconnected, the position of the third channel section corresponds to the position of the second channel section, the position of the fourth channel section corresponds to the position of the first channel section, and the cross-sectional height of the third channel section is greater than the cross-sectional height of the fourth channel section.

[0014] Optionally, the plate heat exchanger further includes fins, and the fins are arranged in the first heat exchange channel and / or the second heat exchange channel.

[0015] Optionally, the first plate and / or the second plate is in a flat plate shape or is provided with a protruding structure.

[0016] The plate heat exchanger provided by the utility model has the following beneficial effects:

[0017] The plate heat exchanger provided by the present invention comprises a plurality of first plates and a plurality of second plates arranged in an overlapping manner. A first heat exchange channel is formed between a first plate and an adjacent second plate, and a second heat exchange channel is formed between a first plate and another adjacent second plate. The first heat exchange channel is used to circulate a heat exchange medium, and at least a portion of the first heat exchange channel comprises a first channel section and a second channel section that are interconnected, with the cross-sectional height of the first channel section being greater than the cross-sectional height of the second channel section. Compared to the prior art, the plate heat exchanger provided by the present invention, due to the use of a first channel section having a greater cross-sectional height than the second channel section, can resolve the adverse effects caused by the heat exchange medium in the gas-liquid two-phase conversion process, improve heat exchange efficiency, and ensure heat exchange effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 A schematic structural diagram of a plate heat exchanger provided in the first embodiment of the present utility model;

[0020] Figure 2 A cross-sectional view of a plate heat exchanger provided in the first embodiment of the present utility model;

[0021] Figure 3 An exploded view of the connection between the first plate and the second plate in the plate heat exchanger provided in the first embodiment of the present utility model;

[0022] Figure 4 An exploded view of a plate heat exchanger provided in a second embodiment of the present invention;

[0023] Figure 5 An exploded view of a plate heat exchanger provided in a third embodiment of the present invention;

[0024] Figure 6 This is an exploded view of a plate heat exchanger provided in the fourth embodiment of the present invention.

[0025] Icon: 100-plate heat exchanger; 110-first plate; 111-first main body; 112-connecting part; 113-second main body; 114-edge part; 120-second plate; 121-third main body; 122-extension part; 123-fourth main body; 124-rib part; 130-first heat exchange channel; 131-first channel section; 132-second channel section; 133-first through hole; 134-second through hole; 140-second heat exchange channel; 141-third channel section; 142-fourth channel section; 150-fin; 160-protruding structure. DETAILED DESCRIPTION

[0026] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0028] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0029] In the description of this utility model, it should be noted that the terms "inner," "outer," "upper," "lower," and "horizontal" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the utility model product is typically placed when in use. These terms are intended solely to facilitate the description of this utility model and simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely for distinction and description and should not be construed as indicating or implying relative importance.

[0030] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "connected," "installed," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0031] The following describes some embodiments of the present invention in detail with reference to the accompanying drawings. In the absence of conflict, the features of the following embodiments can be combined with each other.

[0032] First embodiment

[0033] Please refer to Figures 1 to 3 The present invention provides a plate heat exchanger 100 for heat exchange. The plate heat exchanger 100 can solve the problems caused by the mutual transformation of the heat exchange medium between the gas and liquid phases, improve the heat exchange efficiency, and ensure the heat exchange effect.

[0034] The plate heat exchanger 100 includes a plurality of first plates 110 and a plurality of second plates 120. The plurality of first plates 110 and the plurality of second plates 120 are arranged in an overlapping manner. A first heat exchange channel 130 is formed between a first plate 110 and an adjacent second plate 120, and a second heat exchange channel 140 is formed between a first plate 110 and another adjacent second plate 120. That is, the plurality of first plates 110 and the plurality of second plates 120 together form the plurality of first heat exchange channels 130 and the plurality of second heat exchange channels 140, and the plurality of first heat exchange channels 130 and the plurality of second heat exchange channels 140 are arranged alternately in sequence. Among them, multiple first heat exchange channels 130 are connected in sequence, and multiple first heat exchange channels 130 are used to supply heat exchange medium to circulate, multiple second heat exchange channels 140 are connected in sequence, and multiple second heat exchange channels 140 are used to supply the fluid to be heat exchanged to circulate, and the heat exchange medium is used to exchange heat with the fluid to be heat exchanged through the first plate 110 and the second plate 120 to realize the heat exchange function of the plate heat exchanger 100.

[0035] Furthermore, at least part of the first heat exchange channel 130 includes a first channel section 131 and a second channel section 132 that are interconnected. The heat exchange medium in the first channel section 131 can flow to the second channel section 132, or the heat exchange medium in the second channel section 132 can flow to the first channel section 131. The heat exchange medium in both the first channel section 131 and the second channel section 132 can exchange heat with the fluid to be heat exchanged in the second heat exchange channel 140 through the first plate 110 and the second plate 120. Specifically, the cross-sectional height of the first channel section 131 is greater than the cross-sectional height of the second channel section 132. The cross-sectional height is the distance between the first plate 110 and the second plate 120. By providing the first channel section 131 and the second channel section 132 with different cross-sectional heights, the adverse effects caused by the heat exchange medium in the gas-liquid two-phase conversion process can be solved, the heat exchange efficiency can be improved, and the heat exchange effect can be ensured.

[0036] In this embodiment, the heat exchange medium is a refrigerant. When the plate heat exchanger 100 is used as an evaporator, the liquid-phase refrigerant gradually transforms into the gas phase as it flows and exchanges heat, resulting in an increase in the refrigerant flow rate and an increase in the flow resistance encountered by the refrigerant, thereby increasing the evaporation temperature of the refrigerant and reducing the heat exchange temperature difference, thereby affecting the heat exchange performance. Therefore, the liquid-phase refrigerant is controlled to flow from the second flow channel section 132 to the first flow channel section 131 in the plate heat exchanger 100. During this process, the liquid-phase refrigerant gradually transforms into the gas phase. Since the cross-sectional height of the first flow channel section 131 is greater than the cross-sectional height of the second flow channel section 132, the first flow channel section 131 can accommodate a larger volume of gas-phase refrigerant, thereby reducing the air pressure, effectively reducing the gas-phase refrigerant flow rate, reducing the flow resistance encountered by the refrigerant, reducing the evaporation temperature, and improving the heat exchange effect.

[0037] When the plate heat exchanger 100 is used as a condenser, the gas-phase refrigerant gradually transforms into the liquid phase as it flows and exchanges heat, resulting in a decrease in the refrigerant flow rate, a decrease in the refrigerant flow Reynolds number, and a decrease in heat exchange capacity, thereby affecting heat exchange performance. Therefore, the liquid-phase refrigerant is controlled to flow from the first flow channel section 131 to the second flow channel section 132 in the plate heat exchanger 100. During this process, the gas-phase refrigerant gradually transforms into the liquid phase. Since the cross-sectional height of the first flow channel section 131 is greater than the cross-sectional height of the second flow channel section 132, the flow rate of the liquid-phase refrigerant allowed to pass through the second flow channel section 132 is reduced, thereby increasing the flow rate of the liquid-phase refrigerant, increasing the refrigerant flow Reynolds number, and further enhancing the heat exchange capacity of the liquid-phase refrigerant, thereby improving heat exchange efficiency. Moreover, since the density of liquid refrigerant is much greater than that of gaseous refrigerant, and the total amount of refrigerant in the plate heat exchanger 100 is mainly affected by the volume of the liquid refrigerant, lowering the height of the liquid refrigerant area channel (second flow channel section 132) helps to reduce the refrigerant charge of the plate heat exchanger 100 and the entire refrigerant system, thereby effectively reducing costs.

[0038] In this embodiment, the cross-sectional height of the first flow channel segment 131 is equal to twice the cross-sectional height of the second flow channel segment 132, that is, the cross-sectional area of ​​the first flow channel segment 131 is equal to twice the cross-sectional area of ​​the second flow channel segment 132. A reasonable ratio of the cross-sectional height of the first flow channel segment 131 to the cross-sectional height of the second flow channel segment 132 can further improve heat exchange efficiency and enhance heat exchange effects. However, this is not limited to this. In other embodiments, the cross-sectional height of the first flow channel segment 131 can be equal to 1.5 times the cross-sectional height of the second flow channel segment 132, or it can be equal to 2.5 times the cross-sectional height of the second flow channel segment 132. There is no specific limitation on the ratio of the cross-sectional height of the first flow channel segment 131 to the cross-sectional height of the second flow channel segment 132.

[0039] In this embodiment, the first plate 110 and the second plate 120 are both rectangular, and the first flow channel section 131 and the second flow channel section 132 are arranged in sequence along the length direction of the first plate 110. The length of the first flow channel section 131 is less than or equal to the length of the second flow channel section 132. The length direction of the first plate 110 is the length direction of the plate heat exchanger 100, that is, the cross-sectional height of the first heat exchange channel 130 in the length direction of the plate heat exchanger 100 will change.

[0040] The first plate 110 includes a first body portion 111, a connecting portion 112, and a second body portion 113, which are sequentially connected. The first body portion 111 and the second body portion 113 are parallel and offset in the height direction of the plate heat exchanger 100. The first body portion 111 and the second body portion 113 are not coplanar, and the connecting portion 112 is inclined relative to the first and second body portions 111, 113. The first body portion 111 and the connecting portion 112 are each spaced apart from an adjacent second plate 120 to form a first flow channel section 131. The second body portion 113 is spaced apart from an adjacent second plate 120 to form a second flow channel section 132.

[0041] The second plate 120 includes a third body portion 121, an extension portion 122, and a fourth body portion 123, which are connected in sequence. The third body portion 121 and the fourth body portion 123 are parallel and offset. The third body portion 121 and the fourth body portion 123 are not on the same plane, and the extension portion 122 is inclined relative to the third body portion 121. At least a portion of the first flow channel section 131 is disposed between the third body portion 121 and the first body portion 111, and at least a portion of the second flow channel section 132 is disposed between the fourth body portion 123 and the second body portion 113. The cross-sectional height of the first flow channel section 131 is greater than the cross-sectional height of the second flow channel section 132. In other words, the distance between the third body portion 121 and the first body portion 111 is greater than the distance between the fourth body portion 123 and the second body portion 113.

[0042] In this embodiment, the connecting portion 112 and the extending portion 122 have the same inclination angle, but in opposite directions. The second plate 120 is staggered, meaning the third body portion 121 and the fourth body portion 123 are not coplanar. This increases the difference in cross-sectional height between the first flow channel section 131 and the second flow channel section 132, thereby improving heat exchange performance. However, this is not limiting. In other embodiments, the second plate 120 may also be flat, similarly enabling the cross-sectional height of the first flow channel section 131 to be greater than that of the second flow channel section 132.

[0043] Preferably, the first plate 110 further includes a skirt portion 114, which is disposed around the first body portion 111, the connecting portion 112, and the second body portion 113 to prevent the heat exchange medium from escaping. The second plate 120 includes a rib portion 124, which is disposed around the third body portion 121, the extension portion 122, and the fourth body portion 123 to prevent the heat exchange medium from escaping. The skirt portion 114 and the rib portion 124 are fitted together and welded together to ensure the connection strength between the first plate 110 and the second plate 120, while also ensuring the sealing of the first heat exchange channel 130 and the second heat exchange channel 140, thereby improving the reliability of the plate heat exchanger 100.

[0044] It should be noted that a first through-hole 133 is provided at one end of the first flow channel section 131 away from the second flow channel section 132, and a second through-hole 134 is provided at one end of the second flow channel section 132 away from the first flow channel section 131. When the plate heat exchanger 100 is used as an evaporator, the second through-hole 134 allows the heat exchange medium to flow in, and the first through-hole 133 allows the heat exchange medium to flow out. In this case, the liquid-phase refrigerant flows from the second flow channel section 132 to the first flow channel section 131. When the plate heat exchanger 100 is used as a condenser, the first through-hole 133 allows the heat exchange medium to flow in, and the second through-hole 134 allows the heat exchange medium to flow out. In this case, the liquid-phase refrigerant flows from the first flow channel section 131 to the second flow channel section 132.

[0045] The second heat exchange channel 140 includes a third channel section 141 and a fourth channel section 142 that are interconnected. The position of the third channel section 141 corresponds to the position of the second channel section 132, and the position of the fourth channel section 142 corresponds to the position of the first channel section 131. The cross-sectional height of the third channel section 141 is greater than the cross-sectional height of the fourth channel section 142. Specifically, the fluid to be heat exchanged in the third channel section 141 can flow to the fourth channel section 142, or the fluid to be heat exchanged in the fourth channel section 142 can flow to the third channel section 141. The fluid to be heat exchanged in both the third channel section 141 and the fourth channel section 142 can exchange heat with the heat exchange medium in the first heat exchange channel 130 through the first plate 110 and the second plate 120.

[0046] The plate heat exchanger 100 provided in an embodiment of the present invention comprises a plurality of first plates 110 and a plurality of second plates 120 arranged in an overlapping manner. A first heat exchange channel 130 is formed between a first plate 110 and an adjacent second plate 120, and a second heat exchange channel 140 is formed between a first plate 110 and another adjacent second plate 120. The first heat exchange channel 130 is used to circulate a heat exchange medium and comprises a first channel section 131 and a second channel section 132 that are interconnected. The cross-sectional height of the first channel section 131 is greater than that of the second channel section 132. Compared with the prior art, the plate heat exchanger 100 provided by the present invention, because it employs a first channel section 131 having a greater cross-sectional height than the second channel section 132, can resolve the adverse effects caused by the heat exchange medium during the gas-liquid two-phase conversion process, thereby improving heat exchange efficiency and ensuring heat exchange effects.

[0047] Second embodiment

[0048] Please refer to Figure 4 The embodiment of the present invention provides a plate heat exchanger 100 . Compared with the first embodiment, the difference of this embodiment is that the plate heat exchanger 100 further includes fins 150 .

[0049] In this embodiment, the fins 150 are disposed within the first heat exchange channel 130, i.e., the fins 150 are located within both the first channel section 131 and the second channel section 132. The fins 150 are welded and fixed between the adjacent first and second plates 110, 120. The fins 150 are used to increase the heat exchange area of ​​the heat exchange medium, thereby improving heat exchange efficiency. However, this is not limiting. In other embodiments, the fins 150 may also be disposed within the second heat exchange channel 140, or may be disposed within both the first and second heat exchange channels 130, 140.

[0050] The beneficial effects of the plate heat exchanger 100 provided by the embodiment of the present invention are the same as those of the first embodiment, and are not described in detail here.

[0051] Third embodiment

[0052] Please refer to Figure 5 The embodiment of the present invention provides a plate heat exchanger 100 . Compared with the first embodiment, the difference of this embodiment is that the first plate 110 and / or the second plate 120 is provided with a protruding structure 160 .

[0053] In this embodiment, the first plate 110 and / or the second plate 120 are provided with a raised structure 160 (a herringbone plate structure or a dotted plate structure), thereby increasing the heat exchange area of ​​the heat exchange medium and improving the heat exchange efficiency. In this case, fins 150 may or may not be provided between the first plate 110 and the second plate 120. However, this is not limiting. In other embodiments, the first plate 110 and / or the second plate 120 may also be flat.

[0054] The beneficial effects of the plate heat exchanger 100 provided by the embodiment of the present invention are the same as those of the first embodiment, and are not described in detail here.

[0055] Fourth embodiment

[0056] Please refer to Figure 6 The embodiment of the present invention provides a plate heat exchanger 100. Compared with the first embodiment, the difference of this embodiment is that the arrangement directions of the first flow channel section 131 and the second flow channel section 132 are different.

[0057] In this embodiment, the first plate 110 and the second plate 120 are both rectangular, and the first flow channel section 131 and the second flow channel section 132 are arranged in sequence along the width direction of the first plate 110. The width of the first flow channel section 131 is less than or equal to the width of the second flow channel section 132. The width direction of the first plate 110 is the width direction of the plate heat exchanger 100, that is, the cross-sectional height of the first heat exchange channel 130 in the width direction of the plate heat exchanger 100 will change. At this time, the heat exchange medium flows in a U-shape in the first heat exchange channel 130.

[0058] The beneficial effects of the plate heat exchanger 100 provided by the embodiment of the present invention are the same as those of the first embodiment, and are not described in detail here.

[0059] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A plate heat exchanger, characterized in that: It includes multiple first plates and multiple second plates, which are overlapped in sequence. A first heat exchange channel is formed between the first plate and an adjacent second plate, and a second heat exchange channel is formed between the first plate and another adjacent second plate, wherein the first heat exchange channel is used for the circulation of heat exchange medium, and at least part of the first heat exchange channel includes a first channel section and a second channel section that are interconnected, and the cross-sectional height of the first channel section is greater than the cross-sectional height of the second channel section.

2. The plate heat exchanger according to claim 1, characterized in that The first flow channel section and the second flow channel section are sequentially arranged along the length direction of the first plate, and the length of the first flow channel section is less than or equal to the length of the second flow channel; Alternatively, the first flow channel section and the second flow channel section are sequentially arranged along the width direction of the first plate, and the width of the first flow channel section is less than or equal to the width of the second flow channel.

3. The plate heat exchanger according to claim 1, characterized in that The first plate includes a first body portion, a connecting portion, and a second body portion connected in sequence. The first body portion and the second body portion are parallel and staggered in the height direction of the plate heat exchanger. The connecting portion is arranged obliquely to the first body portion. The first body portion and the connecting portion are both spaced apart from an adjacent second plate to form the first flow channel section. The second body portion is spaced apart from an adjacent second plate to form the second flow channel section.

4. The plate heat exchanger according to claim 3, characterized in that The second plate includes a third body portion, an extension portion and a fourth body portion connected in sequence, the third body portion and the fourth body portion are parallel and staggered in the height direction of the plate heat exchanger, the extension portion is arranged obliquely to the third body portion, at least part of the first flow channel section is arranged between the third body portion and the first body portion, and at least part of the second flow channel section is arranged between the fourth body portion and the second body portion.

5. The plate heat exchanger according to claim 4, characterized in that The connecting portion and the extending portion have the same inclination angle and opposite inclination directions.

6. The plate heat exchanger according to claim 4, characterized in that The first plate also includes a surrounding edge portion, which is simultaneously arranged outside the first main body portion, the connecting portion and the second main body portion; the second plate includes a retaining edge portion, which is fitted with the retaining edge portion and seal-welded.

7. The plate heat exchanger according to any one of claims 1 to 6, characterized in that: A first through hole is provided at one end of the first flow channel section away from the second flow channel section, and a second through hole is provided at one end of the second flow channel section away from the first flow channel section; When the plate heat exchanger is used as an evaporator, the second through hole is used for allowing heat exchange medium to flow in, and the first through hole is used for allowing heat exchange medium to flow out; When the plate heat exchanger is used as a condenser, the first through-hole is used for allowing heat exchange medium to flow in, and the second through-hole is used for allowing heat exchange medium to flow out.

8. The plate heat exchanger according to any one of claims 1 to 6, characterized in that: The second heat exchange channel includes a third channel section and a fourth channel section that are interconnected. The position of the third channel section corresponds to the position of the second channel section, the position of the fourth channel section corresponds to the position of the first channel section, and the cross-sectional height of the third channel section is greater than the cross-sectional height of the fourth channel section.

9. The plate heat exchanger according to any one of claims 1 to 6, characterized in that: The plate heat exchanger further includes fins, which are arranged in the first heat exchange channel and / or the second heat exchange channel.

10. The plate heat exchanger according to any one of claims 1 to 6, characterized in that: The first plate and / or the second plate are in a flat plate shape or are provided with a protruding structure.

Images