Plate heat exchanger

Abstract

A heat exchange core body of the plate heat exchanger comprises a plurality of plate sheets which are arranged in a stacked mode in the thickness direction of the plate heat exchanger, blocking parts are arranged in the length directions of the plate sheets, and two corner holes close to the first ends of the blocking parts are the first corner hole and the second corner hole correspondingly. The first end of the blocking part is connected to the plate edge on the corresponding side, a distance is formed between the second end of the blocking part and the corresponding plate edge, and a plurality of protruding parts are arranged on the plate piece beside the blocking part. The plurality of lug bosses comprise a first lug boss which is close to the blocking part and is adjacent to the first corner hole, a second lug boss which is close to the second end of the blocking part, and a third lug boss which is positioned on the other part of the plate sheet; the first protruding part and the second protruding part can guide the medium to the outer side of the flow channel away from the blocking part. By means of the arrangement, the media can be guided to the outer side of the flow channel at the through-flow positions where the first protruding part and the second protruding part are located, and the heat exchange efficiency of the heat exchanger is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration control, and particularly relates to a plate heat exchanger. Background Art

[0002] The plate heat exchanger has the characteristics of light weight and small volume, and is widely used in different refrigeration application scenarios. Most conventional plate heat exchangers are formed by stacking multiple plates. The plates are formed by stamping thin plates, and flanges with the same height are formed around the plates. After stacking, two mutually isolated flow channels can be formed inside the plate heat exchanger. The refrigerant and the coolant flow in the two flow channels respectively, and heat exchange is carried out through the plates.

[0003] In the related art, a partition portion is formed by being recessed from the plate body in the length direction of the plate. One end of the partition portion extends to the flange on the corresponding side, and there is a gap between the other end and the flange on the corresponding side; the inter-plate channel formed after stacking two adjacent plates is separated into two sub-inter-plate channels by the partition portion. Thus, a U-shaped flow path is formed between the plates. In order to improve the heat exchange performance of the heat exchanger, a number of convex structures are provided on the plates to improve the turbulence of the fluid and at the same time enable the fluid to be evenly distributed, thereby improving the heat exchange performance of the heat exchanger. However, the surface of the partition portion is relatively smooth. For the coolant entering the sub-inter-plate channel, most of it flows along the edge side of the partition portion. The flow rate in the inner region close to the convex rib of the partition portion is relatively large, and the flow rate in the outer region far from the middle convex rib is relatively small, resulting in uneven distribution of the fluid, and the heat exchange efficiency needs to be further improved. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides a plate heat exchanger, which improves the heat exchange efficiency of the heat exchanger through structural optimization.

[0005] The present invention provides a plate heat exchanger, comprising a heat exchange core body, wherein the heat exchange core body includes a plurality of plates stacked along the thickness direction of the plate heat exchanger, and a first inter-plate channel and a second inter-plate channel are formed at intervals, and the plate heat exchanger has at least one first inter-plate channel and at least one second inter-plate channel; the plate heat exchanger has a barrier portion, and the barrier portion extends in the length direction of the plate; two of the corner holes near the first end of the barrier portion are respectively a first corner hole and a second corner hole, the first corner hole is an inlet, and the second corner hole is an outlet; the first end of the barrier portion is connected to the corresponding side plate edge, there is a spacing between the second end of the barrier portion and the corresponding plate edge, and the barrier portion divides the inter-plate channel formed by two adjacent layers of the plates into a first heat exchange area and a second heat exchange area, the first heat exchange area is on the same side as the first corner hole, and the second heat exchange area is on the same side as the second corner hole; a plurality of protrusions are arranged on the plate beside the barrier portion, and the plurality of protrusions include: a first protrusion adjacent to the first corner hole and near the barrier portion, a second protrusion arranged near the second end of the barrier portion, and a third protrusion located at other parts of the plate; wherein, both the first protrusion and the second protrusion can guide the medium to the outer side of the flow channel away from the barrier portion.

[0006] With such an arrangement, at the through-flow positions where the first protrusion and the second protrusion are located, the medium is guided by the first protrusion and the second protrusion to the outer side of the flow channel. Thus, the medium flow rate in the outer flow channel can be increased, the uniformity of the fluid flow path distribution on the plate can be improved, and the flow path of the medium in the inter-plate channel is increased, which can effectively improve the heat exchange efficiency of the heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 is a perspective view of a plate heat exchanger provided by an embodiment of the present application;

[0008] Figure 2 is Figure 1 a schematic structural view of a plate of the plate heat exchanger shown in ;

[0009] Figure 3 is Figure 2 a partially enlarged schematic view of the first protrusion shown in ;

[0010] Figure 4 is Figure 3 a partially enlarged schematic view of the third protrusion shown in ;

[0011] Figure 5 is a schematic structural view of another plate provided by an embodiment of the present application;

[0012] Figure 6 is a schematic structural view of yet another plate provided by an embodiment of the present application;

[0013] Figure 7 This is another structural schematic diagram of the plate provided by the embodiment of the present application.

[0014] In the figure:

[0015] Core body 1, plate 11, first heat exchange area A1, second heat exchange area A2, dashed box B1, dashed box B2;

[0016] Flat plate body 111, flange 112, corner hole 113, barrier part 114, protrusion part 115, first protrusion part 1151, second protrusion part 1152, third protrusion part 1153;

[0017] Plate 11a, protrusion part 115a, first protrusion part 1151a, second protrusion part 1152a, third protrusion part 1153a;

[0018] Plate 11b, protrusion part 115b, first protrusion part 1151b, second protrusion part 1152b;

[0019] Plate 11c, protrusion part 115c, first protrusion part 1151c, second protrusion part 1152c. Detailed implementation manners

[0020] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Please refer to Figure 1 and Figure 2 , wherein, Figure 1 This is a perspective view of a plate heat exchanger provided by the embodiment of the present application, Figure 2 This is a top view of a plate provided by the embodiment of the present application.

[0022] The plate heat exchanger includes a heat exchange core body 1. The heat exchange core body 1 includes a plurality of plates 11 stacked. A first fluid channel and a second fluid channel that are isolated from each other are formed in the heat exchange core body 1. The first fluid channel includes a plurality of first inter-plate channels, a first hole, and a second hole. The second fluid channel includes a plurality of second inter-plate channels, a third hole, and a fourth hole. Four corner holes 113 are respectively arranged on each plate 11. The corner holes 113 are stacked to form four holes, namely a first hole, a second hole, a third hole, and a fourth hole. The first hole and the second hole are communicated through the first inter-plate channel. The third hole and the fourth hole are communicated through the second inter-plate channel.

[0023] The plate 11 includes a planar plate body 111 and a flange 112. The flange 112 is bent from the outer periphery of the planar plate body 111. Four corner holes 113 are provided on the planar plate body 111. The heat exchanger has a barrier portion that extends in the length direction of the plate. In a specific embodiment, a barrier portion 114 is provided in the length direction of the plate 11. The heat exchange regions on both sides of the barrier portion 114 are: a first heat exchange region A1 and a second heat exchange region A2. The first end (upper end) of the barrier portion 114 is connected to the corresponding flange 112, and there is a spacing L between the second end (lower end) of the barrier portion 114 and the corresponding flange 112. The provision of the flange 112 on the outer peripheral edge of the plate facilitates the assembly and fixation of each layer of the plate 11.

[0024] In a specific implementation, the plate 11 can be formed by stamping a thin plate, and the flange 112 and the barrier portion 114 are formed simultaneously. For the heat exchange core 1, it can be formed by laminating the plates 11 as shown in Figure 2 . Specifically, one of the adjacent two layers of plates 11 is arranged centrosymmetrically with respect to the other; in other words, one of the adjacent two layers of plates 11 is placed in the posture of the plate 11 shown in Figure 2 , and the other layer is placed in the posture after rotating the plate 11 shown in Figure 2 by 180 degrees. The heat exchange core 1 is formed by laminating according to this rule.

[0025] It can be understood that the barrier portion 114 formed by stamping is used to separate the inter-plate channels formed between two layers of plates 11. In a specific implementation, the barrier portion 114 can be a convex portion or a concave portion on the plate.

[0026] It should be noted that the principle of the inter-plate flow channels formed by two adjacent layers of plates 11 is the same. For the convenience of description, in this embodiment, the plate shown in Figure 2 is taken as an example to describe in detail a single inter-plate channel (the first inter-plate channel) for the flow of a medium (the first medium) in the heat exchange core 1.

[0027] As shown in Figure 2 , for the two corner holes 113 among the four corner holes 113 that are close to the first end of the barrier portion 114, they are respectively used as the inlet and outlet of the first medium (coolant). After each layer of the plates 11 is laminated, the two corner holes 113 close to the first end of the barrier portion 114 respectively form a first hole channel and a second hole channel, and are communicated with the first inter-plate channel formed by the plate surface shown in the figure of the planar plate body 111; for the two corner holes 113 among the four corner holes 113 that are close to the second end of the barrier portion 114, they are respectively used as the inlet and outlet of the second medium (refrigerant). After each layer of the plates 11 is laminated, the two corner holes 113 close to the second end of the barrier portion 114 respectively form a third hole channel and a fourth hole channel, and are communicated with the second inter-plate channel formed by the opposite side plate surface of the plate surface shown in the figure of the planar plate body 111.

[0028] For the two corner holes 113 near the first end of the barrier portion 114, the corner hole 113 located on the first side (left side in the figure) of the barrier portion 114 is defined as the first corner hole, and the corner hole 113 located on the second side (right side in the figure) of the barrier portion 114 is defined as the second corner hole. Here, taking the first corner hole as the inlet of the first medium and the second corner hole as the outlet of the first medium as an example, this solution will be described in detail.

[0029] As shown by the arrows in the figure, the coolant can flow into the heat exchange area on the left side of the barrier portion 114 through this inlet, and then flow into the heat exchange area on the right side of the barrier portion 114 through the spacing L on the second end side of the barrier portion 114. The coolant after heat exchange can flow out through the outlet, forming a U-shaped flow channel.

[0030] Of course, in other possible implementation manners, correspondingly, the corner hole 113 located on the second side (left side) of the barrier portion 114 is the inlet, and the corner hole 113 located on the first side (left side in the figure) of the barrier portion 114 can also be the outlet. The embodiments of the present application are not limited thereto.

[0031] In this embodiment, a plurality of protrusions 115 are provided on the flat plate body 111 beside the barrier portion 114. Based on the arrangement of the protrusions 115, the turbulence of the fluid can be improved as a whole, and at the same time, the fluid can be evenly distributed, enhancing the heat exchange performance. Figure 2 Each of the protrusions 115 shown has an elliptical cross-section.

[0032] The plurality of protrusions 115 include a first protrusion 1151 adjacent to the first corner hole and close to the barrier portion 114, a second protrusion 1152 close to the second end of the barrier portion 114, and a third protrusion 1153 located in other parts of the flat plate body 111. Please refer to Figure 3 and Figure 4 , wherein, Figure 3 is Figure 2 a partial enlarged schematic view of the first protrusion 1151 shown in Figure 4 is Figure 3 a partial enlarged schematic view of the third protrusion 1153 shown in

[0033] Among them, the major axis of the elliptical cross-section of the third protrusion 1153 is parallel to the extending direction of the barrier portion 114, playing a role in guiding the flow. In the U-shaped flow channel, the first protrusion 1151 and the second protrusion 1152 close to the barrier portion 114 are both inclined. At the flow-through positions where the first protrusion 1151 and the second protrusion 1152 are located, the inner flow resistance close to the barrier portion 114 is greater than the inner flow resistance far from the barrier portion 114, and the medium is guided to the outside of the flow channel.

[0034] Thus, the medium flow rate in the outer flow channel can be increased, the uniformity of the fluid flow path distribution on the plate is improved, and the flow path of the medium in the inter-plate channel is lengthened, effectively improving the heat exchange efficiency of the heat exchanger. Here, the "inner side" refers to the part of the flow channel close to the barrier portion, and the "outer side" refers to the part of the flow channel close to the flanging. It should be understood that the inner flow channel and the outer flow channel are two parts of the inter-plate flow channel, rather than referring to a flow channel with a fixed flow cross-section.

[0035] As Figure 3 shown, one end of the major axis of the elliptical cross-section of the first protrusion 1151 close to the inlet center is arranged closer to the barrier portion 114 than the other end of the major axis of its elliptical cross-section far from the inlet center, and there is an angle α between the major axis of the elliptical cross-section of the first protrusion 1151 and the extension direction of the barrier portion 114, and 0° < α < 90°. That is to say, the elliptical cross-section of the first protrusion 1151 near the first corner hole (inlet) is formed by rotating 0° to 90° clockwise with the center of the elliptical cross-section of the third protrusion 1153 as the origin.

[0036] Preferably, the angle α is 30° to 60°, which can guide the medium to flow along the flat plate body 111 near the flanging 112. On the basis of effectively increasing the medium flow rate in the outer flow channel, the overall flow efficiency can be guaranteed.

[0037] To obtain good flow efficiency, optionally, in the width direction of the plate, the distribution width of the first protrusion 1151 does not exceed 2 / 3 of the width of the first heat exchange area A1; in other words, the protrusions near the first corner hole (inlet) are the third protrusion 1153 and the first protrusion 1151 from left to right in sequence. In specific implementation, it can be determined according to the product design requirements, and the embodiments of the present application do not make limitations.

[0038] In a possible implementation manner, the first protrusions 1151 within the dashed box B1 can be arranged in multiple rows along the length direction of the plate, and the first protrusions 1151 on adjacent two rows are staggered to obtain a good guiding effect.

[0039] In other possible implementation manners, for the multiple first protrusions 1151 within the dashed box B1, the inclination angles of the major axes of the elliptical cross-sections of the first protrusions 1151 (that is, the angle α between the major axis and the extension direction of the barrier portion 114) can be the same or different, as long as the function requirement of effectively increasing the medium flow rate in the outer flow channel is satisfied.

[0040] As Figure 4As shown, the major axis of the elliptical cross-section of the second protrusion 1152 is closer to the end near the inlet center than to the end of its elliptical cross-section away from the inlet center, and is arranged closer to the barrier portion 114. Moreover, there is an angle β between the major axis of the elliptical cross-section of the second protrusion 1152 and the extending direction of the barrier portion 114, and 0° < β < 90°. That is to say, the elliptical cross-section of the second protrusion 1152 near the second end close to the barrier portion 114 is formed by rotating counterclockwise 0° to 90° with the center of the elliptical cross-section of the third protrusion 1153 as the origin.

[0041] Preferably, the angle β is 30° to 60°, which can guide the medium to flow along the flat plate body 111 near the flanging 112. Similarly, to obtain good flow efficiency, optionally, in the width direction of the plate, the distribution width of the second protrusion 1152 does not exceed 2 / 3 of the width of the second heat exchange area A2; in other words, the protrusions at the corner holes 113 on the second side near the second end of the barrier portion 114 are the third protrusion 1153 and the second protrusion 1152 from right to left in sequence. In specific implementation, it can be determined according to the product design requirements, and the embodiments of the present application do not make limitations.

[0042] Similarly, in a possible implementation, the second protrusions 1152 within the dashed box B2 can be arranged in multiple rows along the length direction of the plate, and the second protrusions 1152 in adjacent two rows are staggered. In addition, for the multiple second protrusions 1152 within the dashed box B1, the inclination angles of the major axes of the elliptical cross-sections of the second protrusions 1152 (that is, the angle β between the major axis and the extending direction of the barrier portion 114) can be the same or different.

[0043] In the foregoing embodiments, by controlling the projected area of the corresponding protrusions in the length direction of the plate, the inner flow resistance near the recessed portion 114 is made greater than the inner flow resistance away from the recessed portion 114; that is to say, the widths of the first protrusion 1151 and the second protrusion 1152 in the projected plane in the length direction of the plate are both greater than the width of the third protrusion 1153 on its side in the projected plane in the length direction of the plate. Thereby, the inner flow resistance is increased to guide the medium to the outer side of the flow channel.

[0044] In other possible implementation manners, it is also possible to increase the inner flow resistance by increasing the arrangement density of the first protrusions 1151 within the dashed box B1 and increasing the arrangement density of the second protrusions 1152 within the dashed box B2.

[0045] In the foregoing embodiments, the protrusion 115 has an elliptical cross-section. In specific implementation, the cross-sectional shape of the protrusion can also be strip-shaped, triangular, or bent-shaped, etc.

[0046] Please refer to Figure 5, This figure is a schematic structural diagram of another sheet provided by an embodiment of the present application. To clearly show the differences and connections between this embodiment and the foregoing embodiments, components or structures with the same functions are denoted by the same reference numerals in the figure.

[0047] As Figure 5 shown, the cross-sections of the protrusions 115a on the sheet 11a are all strip-shaped. Similarly, the plurality of protrusions 115a include a first protrusion 1151a adjacent to the first corner hole and close to the barrier portion 114, a second protrusion 1152a close to the second end of the barrier portion 114, and a third protrusion 1153a located in other parts of the flat plate body 111. Among them, the first protrusion 1151a is arranged in the area shown by the dashed box B1, and the second protrusion 1152a is arranged in the area shown by the dashed box B2. In other embodiments, the cross-section of the third protrusion 1153a may also have other shapes such as an ellipse or a bend.

[0048] Among them, the length direction of the third protrusion 1153a is parallel to the extension direction of the barrier portion 114, which plays a role in guiding the flow. In the U-shaped flow channel, the first protrusion 1151a and the second protrusion 1152a close to the barrier portion 114 are both inclined. At the flow-through positions where the first protrusion 1151a and the second protrusion 1152a are located, the inner flow resistance close to the inner side of the barrier portion 114 is greater than the inner flow resistance far from the barrier portion 114, and the medium is guided to the outer side of the flow channel.

[0049] Specifically, one end of the strip-shaped cross-section of the first protrusion 1151a close to the center of the inlet is arranged closer to the barrier portion 114 than the other end far from the center of the inlet, and the included angle between the extension direction of the strip-shaped cross-section of the first protrusion 1151a and the extension direction of the barrier portion 114 can be 0° to 90°. That is to say, the first protrusion 1151a near the first corner hole (inlet) is formed by rotating clockwise 0° to 90° with the geometric center of the third protrusion 1153a as the origin. Preferably, the included angle is 30° to 60°.

[0050] One end of the strip-shaped cross-section of the second protrusion 1152a close to the center of the inlet is arranged closer to the barrier portion 114 than the other end far from the center of the inlet, and the included angle between the extension direction of the strip-shaped cross-section of the second protrusion 1152a and the extension direction of the barrier portion 114 can be 0° to 90°. That is to say, the strip-shaped second protrusion 1152a close to the center of the inlet at the second end of the barrier portion 114 is formed by rotating counterclockwise 0° to 90° with the geometric center of the third protrusion 1153a as the origin. Preferably, the included angle is 30° to 60°.

[0051] In this embodiment, by controlling the projected area of the corresponding convex part in the length direction of the plate, the inner flow resistance near the concave part 114 is made greater than the inner flow resistance far from the concave part 114; that is to say, the widths of the first convex part 1151a and the second convex part 1152a in the projection plane in the length direction of the plate are both greater than the width of the third convex part 1153a on its side in the projection plane in the length direction of the plate. Thus, the inner flow resistance is increased to guide the medium to the outside of the flow channel.

[0052] Other functional components and corresponding structures can be the same as Figure 2 the described embodiment, and will not be elaborated here.

[0053] The foregoing Figure 2 and Figure 5 In the described embodiments, each convex part adopts the same structural shape. In a specific implementation, the multiple convex parts provided on the plate can also adopt different structural shapes.

[0054] Please refer to Figure 6 , which is a schematic structural diagram of another plate provided by the embodiment of the present application. In order to clearly show the differences and connections between this embodiment and the foregoing Figure 2 described embodiment, the components or structures with the same function are schematically shown by the same mark in the figure.

[0055] As Figure 6 shown, the multiple convex parts 115b on the plate 11b include a first convex part 1151b adjacent to the first corner hole and close to the barrier part 114, a second convex part 1152b close to the second end of the barrier part 114, and a third convex part 1153 located in other parts of the flat plate body 111. Among them, the first convex part 1151b is arranged in the area shown by the dotted line frame B1, the second convex part 1152b is arranged in the area shown by the dotted line frame B2, and the cross sections of the first convex part 1151b and the second convex part 1152b are triangular.

[0056] Preferably, the cross sections of the first convex part 1151b and the second convex part 1152b are obtuse triangles or right triangles. Among them, the third convex part 1153 has an elliptical cross section, and the long axis of its elliptical cross section is parallel to the extension direction of the barrier part 114, playing a role in guiding the flow. In the U-shaped flow channel, the long side corresponding to the largest angle of the triangular cross sections of the first convex part 1151b and the second convex part 1152b close to the barrier part 114 faces the side where the medium flows in, and this long side is inclined, guiding the medium to the outside of the flow channel at the flow-through positions where the first convex part 1151b and the second convex part 1152b are located.

[0057] Specifically, the long side of the triangular cross-section of the first convex portion 1151b near the end close to the inlet center is arranged closer to the blocking portion 114 than the other end of its long side far from the inlet center, and the included angle between the extending direction of the long side of the triangular cross-section of the first convex portion 1151b and the extending direction of the blocking portion 114 can be 0° to 90°. Preferably, the included angle is 30° to 60°.

[0058] The long side of the triangular cross-section of the second convex portion 1152b near the end close to the inlet center is arranged closer to the blocking portion 114 than the other end of its long side far from the inlet center, and the included angle between the extending direction of the long side of the triangular cross-section of the second convex portion 1152b and the extending direction of the blocking portion 114 can be 0° to 90°. Preferably, the included angle is 30° to 60°.

[0059] Other functional components and corresponding structures can be the same as Figure 2 the described embodiments and will not be elaborated herein.

[0060] Please refer to Figure 7 which is a schematic structural diagram of another sheet provided by the embodiment of the present application. To clearly show the differences and connections between this embodiment and the Figure 2 previously described embodiments, the components or structures with the same functions are denoted by the same reference numerals in the figure.

[0061] As Figure 7 shown, the multiple convex portions 115c on the sheet 11c include a first convex portion 1151c adjacent to the first corner hole and close to the blocking portion 114, a second convex portion 1152c close to the second end of the blocking portion 114, and a third convex portion 1153 located in other parts of the flat plate body 111. Among them, the first convex portion 1151c is arranged in the area shown by the dashed box B1, the second convex portion 1152c is arranged in the area shown by the dashed box B2, and the first convex portion 1151c and the second convex portion 1152c are bent.

[0062] Among them, the third convex portion 1153 has an elliptical cross-section, and the major axis of its elliptical cross-section is parallel to the extending direction of the blocking portion 114, playing a role in guiding the flow. In the U-shaped flow channel, the bent openings of the first convex portion 1151c and the second convex portion 1152c close to the blocking portion 114 face the side where the medium flows in, and at the flow-through positions where the first convex portion 1151c and the second convex portion 1152c are located, the medium is guided to the outside of the flow channel.

[0063] Specifically, both the bent first convex portion 1151c and the second convex portion 1152c include a long side segment and a short side segment connected to each other. Among them, the short side segment is closer to the blocking portion 114 than the long side segment. In this way, along the medium flow direction, blocked by the short side, the medium is guided along the long side to the next bent convex portion, and part of it will flow left and downward, thus converging with the outer flow path far from the blocking portion 114, improving the uniformity of the fluid distribution on the plate and enhancing the heat exchange efficiency.

[0064] Other functional components and corresponding structures can be the same as Figure 2 the described embodiments and will not be elaborated here.

[0065] It should be noted that the orientation words "up", "down", "left", and "right" used here are all defined based on the relative position relationship shown in the figure. It should be understood that the use of the above orientation words is only for clearly describing the relative position relationship and dynamic cooperation relationship between the components and structures of the solution, rather than constituting a substantial limitation on the plate heat exchanger claimed in this solution.

[0066] In addition, the ordinal numbers used in the above embodiments provided in this embodiment are used to distinguish the same functional components or structures. It should be understood that the application of the above ordinal numbers is only for distinguishing different limited objects and does not constitute a substantial limitation on the plate heat exchanger claimed in this application.

[0067] The above is only the preferred embodiment of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A plate heat exchanger, characterized in that, It includes a heat exchange core body, and the heat exchange core body includes a plurality of plates stacked along the thickness direction of the plate heat exchanger, and first and second inter-plate channels are formed at intervals. The plate heat exchanger has at least one first inter-plate channel and at least one second inter-plate channel; The plate heat exchanger has a barrier portion, and the barrier portion extends in the length direction of the plate. Two of the corner holes near the first end of the barrier portion are a first corner hole and a second corner hole respectively. The first corner hole is an inlet, and the second corner hole is an outlet; The first end of the barrier portion is connected to the plate edge on the corresponding side, and there is a distance between the second end of the barrier portion and the corresponding plate edge. The barrier portion divides the inter-plate channel formed by two adjacent layers of plates into a first heat exchange area and a second heat exchange area. The first heat exchange area is on the same side as the first corner hole, and the second heat exchange area is on the same side as the second corner hole; A plurality of protrusions are provided on the plate beside the barrier portion, and the plurality of protrusions include: A first protrusion adjacent to the first corner hole and close to the barrier portion; A second protrusion provided near the second end of the barrier portion; and A third protrusion located in other parts of the plate; Wherein, both the first protrusion and the second protrusion can guide the medium to the outer side of the flow channel away from the barrier portion.

2. The plate heat exchanger according to claim 1, characterized in that, In the projection plane in the length direction of the plate, the widths of both the first protrusion and the second protrusion are greater than the width of the third protrusion.

3. The plate heat exchanger according to claim 1 or 2, characterized in that, Both the first protrusion and the second protrusion are provided in multiple numbers; the multiple first protrusions are arranged in multiple rows along the length direction of the plate, and the adjacent two rows of the first protrusions are arranged staggeredly; the multiple second protrusions are arranged in multiple rows along the length direction of the plate, and the adjacent two rows of the second protrusions are arranged staggeredly.

4. The plate heat exchanger according to claim 3, characterized in that, In the width direction of the plate, the distribution width of the first protrusion does not exceed 2 / 3 of the width of the first heat exchange area; the distribution width of the second protrusion does not exceed 2 / 3 of the width of the second heat exchange area.

5. The plate heat exchanger according to claim 3, characterized in that, Both the first protrusion and the second protrusion are inclined to guide the medium to the outer side of the flow channel away from the barrier portion.

6. The plate heat exchanger according to claim 4, wherein The first protrusion has an elliptical cross-section. The major axis of the elliptical cross-section of the first protrusion has an included angle α with the extension direction of the barrier portion, and 0° < α < 90°; the second protrusion has an elliptical cross-section. The major axis of the elliptical cross-section of the second protrusion has an included angle β with the extension direction of the barrier portion, and 0° < β < 90°; the third protrusion has an elliptical cross-section or a circular or diamond cross-section, and the axis of symmetry of the cross-section is parallel to the extension direction of the barrier portion.

7. The plate heat exchanger according to claim 6, wherein, The included angle α is 30° to 60°, and the included angle β is 30° to 60°.

8. The plate heat exchanger according to claim 4, characterized in that, At least the cross-sections of the first convex part and the second convex part are strip-shaped; the included angle between the extending direction of the strip-shaped cross-section of the first convex part and the extending direction of the barrier part is 30° to 60°; the included angle between the extending direction of the strip-shaped second convex part and the extending direction of the barrier part is 30° to 60°; the extending direction of the third convex part is parallel to the extending direction of the barrier part.

9. The plate heat exchanger according to claim 4, wherein At least the cross-sections of the first convex part and the second convex part are right-angled or obtuse-angled triangles; the included angle between the extending direction of the long side of the triangular cross-section of the first convex part and the extending direction of the barrier part is 30° to 60°; the included angle between the extending direction of the long side of the triangular second convex part and the extending direction of the barrier part is 30° to 60°.

10. The plate heat exchanger according to claim 3, characterized in that, One end of the first convex part close to the center of the inlet is arranged closer to the barrier part than the other end away from the center of the inlet; one end of the second convex part close to the center of the inlet is arranged closer to the barrier part than the other end away from the center of the inlet.

11. The plate heat exchanger according to claim 1, wherein At least the first convex part and the second convex part are bent, and the bending openings of the first convex part and the second convex part face the side where the medium flows in.

12. The plate heat exchanger according to claim 11, wherein, The bent first convex part and the second convex part both include a connected long side segment and a short side segment, and the short side segment is arranged closer to the barrier part than the long side segment.

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