Plate heat exchanger

Abstract

The invention relates to a plate heat exchanger, a first heat exchange plate and a second heat exchange plate comprise plate surfaces with corrugated structures, the first heat exchange plate comprises a first plate inlet area B1, the first plate inlet area B1 comprises a first port hole, a distribution hole and a protruding part, the protruding part comprises a peripheral wall and a bottom wall, the bottom wall comprises an annular part and an island-shaped part, and the annular part is provided with a first port hole and a second port hole. The island-shaped part is located on the outer side of the annular part and connected with the annular part, the first port hole is located in the annular part, the distribution hole is located in the island-shaped part, and the annular part is welded and fixed to the second heat exchange plate; the heat exchange plate set further comprises reinforcing protrusions, the reinforcing protrusions comprise first reinforcing protrusions located in the first plate inlet area B1, and the first reinforcing protrusions and the second heat exchange plate are welded and fixed. The first reinforcing protrusions are in a strip shape and located beside the protruding parts, and the first reinforcing protrusions and the protruding parts are arranged at intervals to form flow channels. The peripheral strength of the distribution holes is improved, the pressure resistance of the plate sheet is improved, and meanwhile, the reinforcing protrusions and the distribution holes are arranged at intervals so that obstruction of the reinforcing protrusions to refrigerant distribution can be reduced.

Description

[0001] This application claims priority to the Chinese patent application No. 202411044153.6, filed on July 31, 2024, and entitled "Heat exchange plate group and plate heat exchanger", the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the field of refrigeration, air conditioning and heat pump, in particular to a plate heat exchanger. BACKGROUND

[0003] The heat exchange plate group in the plate heat exchanger generally sets a distribution hole at the refrigerant inlet side, and the refrigerant enters the refrigerant channel through the distribution hole on the plate, which can adjust the inlet distribution of gas-liquid two-phase and make the refrigerant entering the plate more uniform. In order to make the refrigerant from the distribution hole flow smoothly, there is usually no corrugation around the distribution hole, which forms a large cavity; however, the fluid pressure at the distribution hole position is large, and the cavity position is easy to be affected by the fluid pressure to produce deformation or even cracking. SUMMARY

[0004] Therefore, it is necessary to provide a plate heat exchanger to strengthen the refrigerant input hole area in the heat exchange plate group under the premise of less affecting the flow of refrigerant.

[0005] In order to achieve the above technical purposes, the present application adopts the following technical solutions:

[0006] The present application provides a plate heat exchanger, which comprises a heat exchange plate group stacked, the heat exchange plate group comprises a first heat exchange plate and a second heat exchange plate, the first heat exchange plate and the second heat exchange plate comprise a plate surface with a corrugated structure, wherein: the first heat exchange plate comprises a first plate inlet area B1, the first plate inlet area B1 comprises a first port hole, a distribution hole and a protruding part, the protruding part comprises a peripheral wall and a bottom wall, the bottom wall comprises an annular part and an island part, the island part is located outside the annular part and connected with the annular part, the first port hole is located in the annular part, the distribution hole is located in the island part, and the annular part is welded and fixed with the second heat exchange plate; the heat exchange plate group further comprises a reinforcing protrusion, the reinforcing protrusion comprises a first reinforcing protrusion located at the first plate inlet area B1, and the first reinforcing protrusion is welded and fixed with the second heat exchange plate; the first reinforcing protrusion is in a strip shape, and the first reinforcing protrusion is located beside the protruding part and is arranged in a spaced manner with the protruding part.

[0007] The present application has the following advantages:

[0008] (1) The present application sets a reinforcing protrusion around the distributor, optimizes the distribution of the welding points around the plane of the distributor, and improves the strength of the refrigerant inlet area.

[0009] (2) The reinforcing protrusion in the application is away from the distribution structure, providing a flow channel between the refrigerant plates, increasing the welding strength of the plane around the distribution structure while reducing the hindrance to the distribution of refrigerant. BRIEF DESCRIPTION OF DRAWINGS

[0010] In order to more clearly illustrate the technical solutions of the embodiments of the application, the drawings of the embodiments will be briefly introduced below. The drawings are only used to show some embodiments of the application, and the application is not limited to the drawings. In the drawings:

[0011] Figure 1 It is a schematic diagram of the first heat exchange plate in an embodiment of the application;

[0012] Figure 2 It is a schematic diagram of the first heat exchange plate in an embodiment of the application; Figure 1 It is a partial enlarged view of the H position in the embodiment;

[0013] Figure 3 It is a schematic diagram of the first heat exchange plate in an embodiment of the application; Figure 1 It is a schematic diagram of another embodiment of the H position;

[0014] Figure 4 It is a schematic diagram of the heat exchange plate group in an embodiment of the application;

[0015] Figure 5 It is a schematic diagram of the heat exchange plate group in an embodiment of the application; Figure 4 It is a partial enlarged view of the M1 position in the embodiment;

[0016] Figure 6 It is a partial enlarged view of the M2 position in the embodiment; Figure 4 It is a partial enlarged view of the M2 position in the embodiment;

[0017] Figure 7 It is a schematic diagram of the first heat exchange plate in an embodiment of the application;

[0018] Figure 8 It is a schematic diagram of the first heat exchange plate in an embodiment of the application; Figure 7 It is a partial enlarged view of the N position in the embodiment;

[0019] Figure 9 It is a partial enlarged view of the I position in the embodiment; Figure 7 It is a partial enlarged view of the I position in the embodiment;

[0020] Figure 10 It is a partial enlarged view of the I position in the embodiment; Figure 7 It is a partial enlarged view of the I position in the embodiment;

[0021] Figure 11 It is a sectional view of the heat exchanger in an embodiment of the application;

[0022] Figure 12 It is a sectional view of the heat exchanger in an embodiment of the application; Figure 11 It is a partial enlarged view of the S position in the embodiment;

[0023] Figure 13 It is a sectional view of the heat exchanger in an embodiment of the application;

[0024] Figure 14 For Figure 13 Partial enlarged view of the middle P position;

[0025] In the drawings:

[0026] 100, heat exchange plate group; 1, first heat exchange plate; 2, second heat exchange plate; 3, plate surface; 31, planar area; 32, corrugated structure; 4, flange; 5, first input hole; 51, first port hole; 52, second port hole; 6, distribution structure; 61, protruding part; 60, distribution hole; 610, peripheral wall; 620, bottom wall; 621, annular part; 622, island part; 201, matching protrusion; 7, reinforcing protrusion; 71, first reinforcing protrusion; 72, second reinforcing protrusion; 70, arc segment; 701, first arc segment; 702, second arc segment; 703, third arc segment; 200, heat exchanger; 21, distribution part; 210, first distribution area; 220, second distribution area; 23, herringbone corrugation; 231, flow guiding area; 232, baffle area; 22, heat exchange part; 24, closed protrusion; 241, first closed protrusion; 242, second closed protrusion; 25, first channel; 26, second channel; 27, third channel; 8, first output hole; 9, second input hole; 10, second output hole. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0028] In the drawings, the shapes and sizes can be exaggerated for clarity, and the same reference numerals will be used throughout the drawings to designate the same or similar components.

[0029] In the following description, words such as center, thickness, height, length, front, back, rear, left, right, top, bottom, upper, lower, etc. are defined with respect to the configuration shown in the drawings, and in particular, "height" corresponds to the dimension from top to bottom, "width" corresponds to the dimension from left to right, and "depth" corresponds to the dimension from front to back, which are relative concepts, and thus can change accordingly depending on the different positions and different use states, and therefore, these or other orientations should not be used to interpret as limiting terms.

[0030] Terms relating to attachment, connection, and the like refer to a relationship in which the structures are fixed or positioned indirectly through an intermediate structure or directly by connection to each other, as well as movable or rigid attachment, unless explicitly stated otherwise.

[0031] In order to make the objectives, technical solutions, and advantages of the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely intended to explain the present application and not to limit the present application.

[0032] To achieve the above-mentioned object and other advantages of the present application, the present application provides the following technical solutions:

[0033] In one aspect, as shown in Figure 1 、 Figure 4 、 Figure 7 、 Figure 11 The present application provides a plate heat exchanger 200, which includes a stack of heat exchange plate groups 100, the heat exchange plate group 100 includes a first heat exchange plate 1 and a second heat exchange plate 2, the first heat exchange plate 1 and the second heat exchange plate 2 include a plate surface 3 and a flange 4 arranged around the plate surface 3, the plate surface 3 has a corrugated structure 32 and a flat area 31, the corrugated structure 32 is protruding or recessed relative to the flat area 31. The plate surface 3 includes a distribution part 21 and a heat exchange part 22.

[0034] The distribution part 21 includes a first distribution area 210 and a second distribution area 220 located at both ends of the plate surface 3 in the length direction, respectively, and the heat exchange part 22 is located between the first distribution area 210 and the second distribution area 220. The distribution part 21 includes a port hole area, the port hole area includes a port hole and a flat area 31 around the port hole.

[0035] In an embodiment, the port hole includes the first input hole 5 and the first output hole 8 for the flow of the first medium, and the second input hole 9 and the second output hole 10 for the flow of the second medium; the port hole area on the same plate surface 3 includes a second inlet area A and a second outlet area C for the flow of the second medium, and a first inlet area B and a first outlet area D for the flow of the first medium, the first input hole 5 is located in the first inlet area B, the first output hole 8 is located in the first outlet area D, the second input hole 9 is located in the second inlet area A, and the second output hole 10 is located in the second outlet area C. The first inlet area B and the second outlet area C are located in the first distribution area 210, and the first outlet area D and the second inlet area A are located in the second distribution area 220.

[0036] As shown in Figure 4 、 Figure 5 、 Figure 6As shown in the figure, the first inlet area B includes a first plate inlet area B1 on the first heat exchange plate and a second plate inlet area B2 on the second heat exchange plate; the first input hole 5 includes a first port hole 51 on the first plate inlet area B1 and a second port hole 52 on the second plate inlet area B2.

[0037] As shown in the figure, Figure 2 , Figure 4 , Figure 5 As shown in the figure, the first plate inlet area B1 includes a distribution structure 6 located around the first port hole 51, the distribution structure 6 includes a raised portion 61 and a distribution hole 60, the raised direction of the raised portion 61 is consistent with the raised direction of the corrugation; the raised portion 61 includes a peripheral wall 610 and a bottom wall 620, the bottom wall 620 includes an annular portion 621 and an island-shaped portion 622, the island-shaped portion 622 is located outside the annular portion 621 and connected with the annular portion 621, the first port hole 51 is located on the annular portion 621, the distribution hole 60 is located on the island-shaped portion 622, and the annular portion 621 is welded and fixed with the second heat exchange plate 2.

[0038] It should be understood that the raised portions in the figure all refer to the raised portions relative to the planar area 31 of the region, and according to different actual processing methods of the heat exchange plate, the raised portions can be upwardly raised or downwardly recessed relative to the planar area 31 of the region. Similarly, the bottom wall 620 of the raised portion 61 refers to the top wall when the raised portion 61 is raised relative to the planar area 31, and refers to the bottom wall when the bottom wall 620 of the raised portion 61 is recessed relative to the planar area 31.

[0039] Through the above structural design, the distribution structure 6 in the application adopts a continuous raised structure, including a continuous annular portion 621 and an island-shaped portion 622, the annular portion 621 is arranged around the first port hole 51, and the annular portion 621 on the first heat exchange plate 1 is welded with the second heat exchange plate 2 to improve the welding strength around the port hole, prevent virtual welding and missed welding, ensure that the refrigerant only enters the first medium passage through the distribution hole 60 on the island-shaped portion 622, and improve the distribution speed and uniformity of the first medium.

[0040] It should be noted that the first medium in the application undergoes temperature rise in the heat exchange process, flows in at a lower initial temperature at the position of the distribution hole 60, and flows out at a higher temperature than the initial temperature at the position of the first output hole 8; correspondingly, the second medium undergoes temperature drop in the heat exchange process, flows in at a higher initial temperature at the second input hole 9, and flows out at a lower temperature than the initial temperature at the second output hole 10 after flowing through the plate surface 3; generally, the first medium is refrigerant, and the second medium is water or other fluids that need to be heat exchanged.

[0041] As shown in the figure, Figure 2 , Figure 4 , Figure 5 , Figure 6As shown in the figure, the first inlet area B further comprises a reinforcing protrusion 7, which comprises a first reinforcing protrusion 71 located at the first plate inlet area B1, and the first reinforcing protrusion 71 is welded and fixed with the second heat exchange plate 2 when the plate stack is formed; the first reinforcing protrusion 71 is located beside the protruding part 61 and is arranged at a distance from the protruding part 61.

[0042] Through the above structural design, the reinforcing protrusion 7 is arranged at the side of the communicating protrusion distribution structure 6, which further increases the welding strength of the side of the distribution structure 6, improves the pressure resistance of the refrigerant inlet area, and at the same time, the reinforcing protrusion 7 is at a distance from the distribution structure 6, and a refrigerant flow channel is formed therebetween, which prevents the smooth distribution of the refrigerant between the plates.

[0043] In an embodiment, as shown in the figure, Figure 4 , Figure 6 As shown in the figure, the second heat exchange plate 2 comprises a second plate inlet area B2, which comprises a second port hole 52, a second reinforcing protrusion 72 and a matching protrusion 201, and the second port hole 52 is located at the top of the matching protrusion 201; the second reinforcing protrusion 72 is opposite to the first reinforcing protrusion 71 in direction, and the matching protrusion 201 is opposite to the annular part 621 in direction; when the first heat exchange plate 1 and the second heat exchange plate 2 are stacked, the annular part 621 is welded and fixed with the matching protrusion 201, and the second reinforcing protrusion 72 is welded and fixed with the first heat exchange plate 1. Preferably, the second reinforcing protrusion 72 is welded and fixed with the first reinforcing protrusion 71, the first port hole 51 is communicated with the second port hole 52, and the projection of the distribution hole 60 along the stacking direction of the heat exchange plate group 100 is located outside the projection of the matching protrusion 201.

[0044] Preferably, in this embodiment, the annular part 621 and the first reinforcing protrusion 71 located on the first heat exchange plate 1 are equal in height to the corrugated structure 32 on the first heat exchange plate 1, and the matching protrusion 201 and the second reinforcing protrusion 72 located on the second heat exchange plate 2 are equal in height to the corrugated structure 32 on the second heat exchange plate 2, so as to improve the uniformity of extension when the plate is pressed.

[0045] Optionally, the reinforcing protrusion 7 in the application can be pressed to twice the corrugated height, that is, the first reinforcing protrusion 71 is welded with the planar area 31 of the second heat exchange plate 2, the second reinforcing protrusion 72 is welded with the planar area 31 of the first heat exchange plate 1, and the first reinforcing protrusion 71 and the second reinforcing protrusion 72 are arranged at a distance; optionally, the annular part 621 can also be pressed to twice the corrugated depth, and is welded with the planar area 31 of the second heat exchange plate 2, and the second heat exchange plate 2 does not need to be provided with the matching protrusion 201, at this time, the island-shaped part 622 protrudes outward from the peripheral wall 610 of the annular part 621, and the height of the island-shaped part 622 is 1 / 3-1 / 2 of the height of the annular part 621.

[0046] In one embodiment, the first plate inlet region B1 includes at least two of the first reinforcing protrusions 71, which are disposed around the annular portion 621. Specifically, the first inlet region B includes two sets of reinforcing protrusions 7, each set consisting of a first reinforcing protrusion 71 and a second reinforcing protrusion 72 that are disposed opposite to each other and welded to each other when the plates are stacked to form the heat exchanger 200. The two sets of reinforcing protrusions 7 are located on both sides of the annular portion 621 to uniformly strengthen the planar regions 31 on both sides of the distribution structure 6; or as... Figure 2 , Figure 9 As shown, the first inlet area B includes at least three sets of reinforcing protrusions 7, which are arranged around the annular portion 621 to reinforce the periphery of the distribution structure 6.

[0047] Preferred, such as Figure 7 , Figure 9 , Figure 10 As shown, the center of the first port hole 51 is defined as E, and the distance between center E and the edge of the plate surface 3 in the length direction has a minimum value E1, and the distance between center E and the edge of the plate surface 3 in the width direction has a minimum value E2; the center of the distribution hole 60 is defined as G, and the distance between center G and the edge of the plate surface 3 in the length direction has a minimum value G1, and the distance between center G and the edge of the plate surface 3 in the width direction has a minimum value G2; then the relationship between E1 and G1 satisfies G1 > E1, and the relationship between E2 and G2 satisfies E2 > G2. Preferably, the line connecting center E and center G is defined as L, and the acute angle formed by the line connecting L and the adjacent edge of the plate surface 3 in the width direction is α1, then 30° ≤ α1 ≤ 75°.

[0048] Through the above structural design, the distribution hole 60 in this invention is located inside the width direction of the plate and points to the adjacent width direction edge. This facilitates the refrigerant's flow time in the distribution area when it flows in from the distribution hole 60, thereby improving the uniformity of refrigerant distribution. Furthermore, the distribution structure 6 is provided with reinforcing protrusions 7 on its periphery, which can further turbulentize the refrigerant and prevent it from flowing too quickly along the length direction of the plate surface 3 towards the first medium outlet, thus avoiding insufficient refrigerant distribution in the width direction of the plate surface 3 and affecting the heat exchange area of ​​the plate surface 3. Preferably, the reinforcing protrusions 7 are not located in the extension direction of the island portion 622 to avoid directly obstructing the refrigerant flow.

[0049] In one embodiment, such as Figure 2 , Figure 3 , Figure 9 As shown, the reinforcing protrusion 7 is an arc segment 70, with the arc center of the arc segment 70 defined as T and the radius of the arc segment 70 as R1. The protrusions 61 on the same heat exchange plate have the same arc center T and radius R1.

[0050] Optional, such as Figure 2 , Figure 9As shown in the figure, the arc center T is located at the center E of the first port hole 51, the line Q is defined as the line connecting the end of the arc segment 70 adjacent to the distribution hole 60 and the arc center T, and the angle a3 is defined as the included angle between the line Q and the line L. The angle a3 is in the range of 30°-70°, and the end of the arc segment 70 adjacent to the distribution hole 60 is away from the peripheral wall 610 at the position of the island 622. The arc segment 70 and the island 622 form a refrigerant inter-plate flow channel.

[0051] Preferably, the arc segment 70 includes a first arc segment 701, a second arc segment 702, and a third arc segment 703, and the included angle between the two ends of each arc segment 70 is in the range of 20°-60°. The three arc segments 70 are arranged counterclockwise starting from the first arc segment 701 on the right side of the distribution hole 60. When the refrigerant enters the inter-plate flow channel from the distribution hole 60, most of the refrigerant is directly introduced into the plate corrugation along the direction of the distribution hole 60 due to the influence of the welded annular portion 621. At the same time, a small part of the refrigerant will also pass through the island 622 on both sides. This part of the refrigerant flows through the inside channel of the arc segment 70, and a part of it enters the plate through the channel between the first arc segment 701 and the second arc segment 702, and another part of the refrigerant enters the plate through the channel between the second arc segment 702 and the third arc segment 703 to participate in heat exchange. Through the above structure design, the uniformity of the refrigerant distribution in the width direction of the plate 3 is improved.

[0052] At the same time, the third arc segment 703 is located in the direction of the included angle between the length direction edge of the plate 3 and the width direction edge of the plate 3, which can hinder the flow of the refrigerant towards the corner of the plate 3. When the heat exchanger 200 formed by the plate group is used as an evaporator, the refrigerant inlet temperature is low. By setting the third arc segment 703 in the direction of the included angle, a part of the refrigerant can be prevented from entering the area, and the risk of freezing of the second medium, especially water, at the corresponding position due to insufficient turbulence and low temperature can be prevented.

[0053] Optionally, as shown in the figure, Figure 3As shown in the figure, the arc center T is located on the line L, the line Q is defined as the line connecting the end of the arc segment 70 adjacent to the distribution hole 60 and the arc center T, and the acute angle a3 between the line Q and the line L is defined. The angle a3 is in the range of 30°-70°, and the end of the arc segment 70 adjacent to the distribution hole 60 is away from the peripheral wall 610 at the position of the island-shaped part 622. Preferably, 3-4 arc segments 70 are provided, and the angle between the two ends of each arc segment 70 is in the range of 10°-60°. During the pressing of the plate, a larger plane is prone to uneven stress, which further affects the flatness of the plane, causes a gap during the welding of the plane, and causes a virtual weld, thereby causing the risk of internal leakage. Through the structure design, the arc segment 70 is eccentrically arranged with the first port hole 51 and uniformly distributed on the side of the distribution structure 6, while the area of the plane area 31 on the side of the distributor is as small as possible, so as to prevent the formation of a larger plane and further improve the structural strength of the refrigerant inlet area. It should be noted that, according to the actual production limitation, the arc segment center T may not accurately fall on the line L, or the plurality of arc segments 70 are not concentric. The figure in the present application only shows an ideal implementation manner, and other implementation manners in which the arc segments 70 are not concentric with the center E are also within the protection scope of the present application.

[0054] In an embodiment, as shown in Figure 7 , Figure 8 As shown in the figure, the distribution part 21 has a chevron-shaped corrugation 23; the chevron-shaped corrugation 23 located in the same fluid distribution area includes a flow guide area 231 and a baffle area 232 located on both sides of the flow guide area 231, the baffle area 232 includes a first side and a second side, the first side is located at the edge of the plate 3 in the length direction, and the second side is connected with the edge of the heat exchange part 22 in the width direction. It should be noted that the baffle area 232 in the figure is only a position indication, and is not limited to the specific distribution shape and range of the baffle area 232 in the actual product. The opening angle of the chevron-shaped corrugation 23 of the flow guide area 231 is defined as a4, and the angle between the extension lines of the corrugations of the two baffle areas 232 is defined as a5, and a5≤a4. The corrugation angle a5 of the baffle area 232 is smaller than the opening angle a4 of the chevron-shaped corrugation 23 of the flow guide area 231, which can change the flow direction, guide the flow guide area 231 to the direction of the heat exchange part 22, and is beneficial to the uniform distribution of the fluid; compared with the chevron-shaped corrugation 23 of the flow guide area 231, the angle a5 of the baffle area 232 is smaller, which can increase the number of welding points at the position of the baffle area 232, and play a role in strengthening the connection. Further, the inclination direction of the corrugation of the heat exchange part 22 is different from the inclination direction of at least part of the adjacent chevron-shaped corrugation 23, which further changes the flow direction and is beneficial to the uniform distribution of the fluid in the entire heat exchange area.

[0055] In an embodiment, as shown in Figure 11 , Figure 12 , Figure 13 ,Figure 14 As shown, the heat exchanger 200 includes a plurality of stacked heat exchange plate groups 100, each heat exchange plate group 100 consisting of two heat exchange plates having the aforementioned structure, with a single-layer medium channel for the flow of a certain medium formed between the two heat exchange plates.

[0056] like Figure 1 , Figure 4 As shown, the heat exchange plate assembly 100 also includes a sealing protrusion 24, which is arranged around the port hole. The sealing protrusion 24 includes a first sealing protrusion 241 located on the first heat exchange plate 1 and a second sealing protrusion 242 located on the second heat exchange plate 2. The first sealing protrusion 241 and the second sealing protrusion 242 are arranged opposite to each other and welded to each other to seal the port hole. Each heat exchange plate assembly 100 includes at least two sets of sealing protrusions 24.

[0057] In further proposals, such as Figure 1 As shown, there are three sets of closed protrusions 24. These three sets of closed protrusions 24 are respectively arranged around the second input hole 9, the second output hole 10, and the first output hole 8. The closed protrusions 24 located at the first medium flow port hole and the closed protrusions 24 located at the second medium flow port hole face opposite directions, i.e.:

[0058] When the heat exchange plate assembly 100 is stacked, the first closed protrusion 241 located at the second input hole 9 is opposite in direction and welded and fixed, and the closed protrusion 24 located at the second output hole 10 is opposite in direction and welded and fixed, then the flow channel between the plates is the first medium channel; at this time, the closed protrusion 24 located at the first output hole 8 is facing away from each other, and the first output hole 8 is opened.

[0059] In adjacent heat exchange plate groups 100, the orientations of the second input holes 9 are opposite to each other, and the second input holes 9 are open; the orientations of the closed protrusions 24 of the second output holes 10 are opposite to each other, and the second output holes 10 are open, then the flow channel between the plates is the second medium channel; at this time, the orientations of the closed protrusions 24 of the first output holes 8 are opposite and welded and fixed, and the first output holes 8 are closed.

[0060] Through the above structural design, the heat exchanger 200 achieves selective communication between the first medium and the second medium by using closed protrusions 24 with different directions in the plate group.

[0061] In another embodiment, such as Figure 4 , Figure 7 , Figure 12 , Figure 14 As shown, the heat exchange plate assembly 100 has six port hole areas (B / C / B' / D / A / D', the port hole areas are labeled accordingly in the following text), and four plates are stacked to form three channels, namely a water-side channel W and two refrigerant channels R1 and R2, where A / C are the port holes of the water-side channel.

[0062] Specifically, as shown in Figure 4 , Figure 7 , Figure 11 , Figure 12 , Figure 13 , Figure 14 The plate heat exchanger 200 includes two refrigerant passages for refrigerant flow, respectively, a first passage 25 and a third passage 27, the first passage 25 and the third passage 27 are arranged at intervals, and both include a first inlet area B and a first inlet area B', the first inlet area B and the first inlet area B' in the same heat exchange plate group 100 both include a protrusion 61 and a reinforcing protrusion 7, one of the first inlet area B and the first inlet area B' has a distribution hole 60, the areas where the distribution holes 60 in the first passage 25 and the third passage 27 are different. Mark the first passage 25 as R1, and mark the third passage 27 as R2, the two first medium passages are not connected to each other, and different refrigerants can flow therebetween.

[0063] When the refrigerant passages adopt cross flow, the first inlet area B corresponds to the first outlet area D', and the first inlet area B' corresponds to the first outlet area D; when the refrigerant passages adopt parallel flow, the port hole area B corresponds to the first outlet area D, and the first inlet area B' corresponds to the first outlet area D'.

[0064] As shown in Figure 11 , Figure 12 , Figure 13 , Figure 14 In order to make the two refrigerant passage entrances different, the second heat exchange plate 2 in the heat exchange plate group 100 has a J plate type, the J plate type does not have a distributor, the first heat exchange plate 1 has two different K and K' plate types, the K plate type has only one port hole for the first medium, a distributor is arranged at the first inlet area B of the plate, that is, a distribution hole 60 is arranged at the first inlet area B, and no distribution hole 60 is arranged at the port hole B', the first refrigerant passage R1 only passes through the distribution hole 60 at the B position to enter the interlayer flow channel, and the second refrigerant passage R2 is not connected in the interlayer flow channel. No distribution hole 60 is arranged at the first inlet area B of the K' plate, and a distribution hole 60 is arranged at the first inlet area B', the second refrigerant passage R2 only passes through the distribution hole 60 at the first inlet area B' position to enter the interlayer flow channel, and the first refrigerant passage R1 is not connected in the interlayer flow channel. Through the above structural design, when the heat exchange plates in the heat exchanger 200 are stacked in the order of J-K-J-K'-J-K-J-K'……, a double refrigerant circuit of water side passage W-first refrigerant passage R1-water side passage W-second refrigerant passage R2…… will be formed in turn.

[0065] Further, as shown in Figure 4 , Figure 7 , Figure 11 , Figure 12 ,Figure 13 , Figure 14 As shown, in order to facilitate plate processing, the first inlet area B and the first inlet area B' of the J plate type are both pressed with mating protrusions 201, and the first inlet area B and the first inlet area B' of the K plate type are both pressed with protrusions 61; the difference between the K plate type and the K' plate type is that the protrusions 61 at different positions are provided with distribution holes 60 to distinguish the inlets of the first refrigerant channel R1 and the second refrigerant channel R2.

[0066] In a further embodiment, both the first channel 25 and the third channel 27 include a first outlet area D and a first outlet area D'. The first inlet area B and the first inlet area B' are located on one side of the length direction of the heat exchange plate assembly 100, and the first outlet area D and the first outlet area D' are located on the other side of the length direction of the heat exchange plate assembly 100. The first outlet area D and the first outlet area D' include a sealing protrusion 24 and a first output hole 8. One of the first outlet areas D and the first outlet area D' of the same heat exchange plate assembly 100 has a first output hole 8, and the other is blocked and closed by the sealing protrusion 24. The same first medium channel is connected at the position of the first output hole 8, and the areas where the first output hole 8 is located in the two first medium channels are different.

[0067] Specifically, taking cross-flow heat exchange as an example, when heat exchanger plates are stacked in 100 layers, the distribution hole 60 is located in the first inlet region B, the first outlet hole 8 is located in the first outlet region D', and the first sealing protrusion 241 and the second sealing protrusion 242 located in the first outlet region D are oriented opposite each other and welded together. This inter-plate flow channel is the first refrigerant channel R1. Correspondingly, in the inter-plate flow channel where the second refrigerant channel R2 is located, the distribution hole 60 is located in the first inlet region B', the first outlet hole 8 is located in the first outlet region D, and the first sealing protrusion 241 and the second sealing protrusion 242 located in the first outlet region D' are oriented opposite each other and welded together.

[0068] Preferred, such as Figure 13 , Figure 14As shown in FIG. 1, the diameter of the first output hole 8 is larger than the outer diameter of the closed protrusion 24, so that in the unified pressing sheet, the port hole for forming the first output hole 8 can be punched by punching the closed protrusion 24. In a further aspect, the K plate type is unified in the first inlet area B and the first inlet area B' to press the protrusion 61, and is unified in the first outlet area D and the first outlet area D' to press the closed protrusion 24, and is selectively punched in the different sides of the distribution hole 60 and the first output hole 8 in the formed sheet to distinguish the K plate type and the K' plate type. The J plate type is interposed between the two plate types to form a heat exchanger. In this case, when the distribution hole 60 and the first output hole 8 are selected to be on the same side along the length direction of the heat exchange plate group 100, the fluids in the first channel 25 and the third channel 27 flow in parallel; when the distribution hole 60 and the first output hole 8 are selected to be on different sides along the length direction of the heat exchange plate group 100, the fluids in the first channel 25 and the third channel 27 flow in cross.

[0069] Further, the first outlet area D and the first outlet area D' of the J plate type are unified to press the closed protrusion 24 to be welded with the closed protrusion 24 on the K plate type and the K' plate type. Optionally, the port hole with a larger diameter for forming the first output hole 8 can be formed on the first heat exchange plate 1 or on the second heat exchange plate 2.

[0070] In an embodiment, as shown in FIG. 1, the two heat exchange plate groups 100 of the same plate group are in an asymmetric form. The corrugation height of the distribution part 21 of the J plate type heat exchange plate group 100 is equal, and the corrugation height of the heat exchange part 22 of the K plate type heat exchange plate group 100 is not equal. Figure 11 、 Figure 12 In an embodiment, as shown in FIG. 1, the two heat exchange plate groups 100 of the same plate group are in an asymmetric form. The corrugation height of the distribution part 21 of the J plate type heat exchange plate group 100 is equal, and the corrugation height of the heat exchange part 22 of the K plate type heat exchange plate group 100 is not equal.

[0071] The technical features of the above-described embodiments can be combined in any manner. For the sake of brevity, not all possible combinations of the technical features in the above-described embodiments are described, but it should be understood that any combination of the technical features is within the scope of the present disclosure as long as the combination does not result in a contradiction.

[0072] The above-described embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent. It should be noted that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application.

Claims

1. A plate heat exchanger (200) comprising a stack of heat exchanger plate packages (100), the heat exchanger plate package (100) comprising a first heat exchanger plate (1) and a second heat exchanger plate (2), the first heat exchanger plate (1) and the second heat exchanger plate (2) comprising a plate face (3) having a corrugated structure (32), characterized in that: the first heat exchanger plate (1) comprises a first plate inlet area B1, the first plate inlet area B1 comprising a first port hole (51), a distribution hole (60) and a protrusion (61), the protrusion (61) comprising a peripheral wall (610) and a bottom wall (620), the bottom wall (620) comprising an annular portion (621) and an island portion (622), the island portion (622) being located outside the annular portion (621) and connected to the annular portion (621), the first port hole (51) being located in the annular portion (621), the distribution hole (60) being located in the island portion (622), the annular portion (621) being welded to the second heat exchanger plate (2); the heat exchanger plate package (100) further comprises a reinforcement protrusion (7), the reinforcement protrusion (7) comprising a first reinforcement protrusion (71) located in the first plate inlet area B1, the first reinforcement protrusion (71) being welded to the second heat exchanger plate (2); the first reinforcement protrusion (71) is in the shape of a strip, the first reinforcement protrusion being located beside and spaced apart from the protrusion (61).

2. The plate heat exchanger (200) according to claim 1, characterized in that the second heat exchanger plate (2) further comprises a second plate inlet area B2, the second plate inlet area B2 comprising a second port hole (52), a second reinforcement protrusion (72) and a mating protrusion (201), the second port hole (52) being located on top of the mating protrusion (201), the annular portion (621) being welded to the mating protrusion (201), the second reinforcement protrusion (72) being welded to the first heat exchanger plate (1), the first port hole (51) being in communication with the second port hole (52); a projection of the distribution hole (60) along a stacking direction of the heat exchanger plate package (100) is located outside a projection of the mating protrusion (201).

3. The plate heat exchanger (200) according to claim 2, characterized in that the first plate inlet area B1 comprises at least two first reinforcement protrusions (71), the first reinforcement protrusions (71) being arranged around the annular portion (621).

4. The plate heat exchanger (200) according to claim 3, characterized in that the reinforcement protrusion (7) is in the shape of an arc segment (70), the arc segment (70) having a radius R1, the reinforcement protrusions (7) on the same heat exchanger plate having the same center of arc T and radius R1.

5. The plate heat exchanger (200) according to claim 4, characterized in that The center of the first port hole (51) is defined as E, the distance between the center E and the length direction edge of the plate surface (3) has a minimum value E1, and the distance between the center E and the width direction edge of the plate surface (3) has a minimum value E2; the center of the distribution hole (60) is defined as G, the distance between the center G and the length direction edge of the plate surface (3) has a minimum value G1, and the distance between the center G and the width direction edge of the plate surface (3) has a minimum value G2; the relationship between E1 and G1 satisfies G1>E1, and the relationship between E2 and G2 satisfies E2>G2.

6. The plate heat exchanger (200) according to claim 5, characterized in that The arc center of the arc segment (70) is defined as T, the arc center T is located at the center E of the first port hole (51), the line connecting the center E and the center G is defined as L, the line connecting the end of the arc segment (70) adjacent to the distribution hole (60) and the arc center T is defined as Q, and the included angle a3 formed by the line Q and the line L is defined as an acute angle, the included angle a3 has an angle value range of 30°-70°, and the end of the arc segment (70) adjacent to the distribution hole (60) is away from the peripheral wall (610) at the position of the island-shaped part (622).

7. The plate heat exchanger (200) according to claim 5, characterized in that The arc center of the arc segment (70) is defined as T, the line connecting the center E and the center G is defined as L, and the arc center T is located on the line L; the line connecting the end of the arc segment (70) adjacent to the distribution hole (60) and the arc center T is defined as Q, and the acute included angle a3 formed by the line Q and the line L is defined, the included angle a3 has an angle value range of 30°-70°, and the line Q is away from the peripheral wall (610) at the position of the island-shaped part (622).

8. The plate heat exchanger (200) according to claim 1, characterized in that The plate surface (3) of the heat exchange plate group (100) includes a distribution part (21) and a heat exchange part (22), the first plate inlet area B1 is located in the distribution part (21), the distribution part (21) includes a first distribution area (210) and a second distribution area (220) located at the two ends of the length direction of the plate surface (3) respectively, and the first distribution area (210) and the second distribution area (220) have herringbone corrugations (23); the heat exchange part (22) is located between the first distribution area (210) and the second distribution area (220).

9. The heat transfer plate package (100) according to claim 8, characterized in that The herringbone corrugations (23) located in the same distribution area include a flow guide area (231) and a baffle area (232) located on both sides of the flow guide area (231), the baffle area (232) includes a first side and a second side, the first side is located at the edge of the length direction of the plate surface (3), and the second side is connected with the edge of the width direction of the heat exchange part (22); the opening angle of the corrugation of the flow guide area (231) is defined as a4, and the included angle of the extension lines of the corrugations of the two baffle areas (232) is defined as a5, then a5≤a4.

10. The plate heat exchanger (200) according to any of the claims 1-9, characterized in that The heat exchange plate group (100) comprises a port hole area, the port hole area comprises a port hole and a sealing protrusion (24), the sealing protrusion (24) is arranged around the port hole, the sealing protrusion (24) comprises a first sealing protrusion (241) located on the first heat exchange plate (1) and a second sealing protrusion (242) located on the second heat exchange plate (2); the first sealing protrusion (241) and the second sealing protrusion (242) are oppositely arranged and welded and fixed to seal the port hole; each heat exchange plate group (100) comprises at least two groups of sealing protrusions (24).

11. The plate heat exchanger (200) according to claim 10, characterized in that The plate heat exchanger (200) comprises a first channel (25), a second channel (26) and a third channel (27), the first channel (25), the second channel (26) and the third channel (27) are sequentially arranged and not communicated with each other along the stacking direction of the heat exchange plate group (100), the first channel (25) and the third channel (27) each comprise a first inlet area B and a first inlet area B', the first inlet area B and the first inlet area B' in the same flow passage each comprise the protrusion part (61) and the matching protrusion (201), one of the first inlet area B and the first inlet area B' in the same channel has a distribution hole (60), the first channel (25) and the second channel (26) are different in the area where the distribution hole (60) is located.

12. The plate heat exchanger (200) according to claim 11, characterized in that The first channel (25) and the third channel (27) each comprise a first outlet area D, a first outlet area D' and a first output hole (8), the first inlet area B and the first inlet area B' are located on one side of the length direction of the heat exchange plate group (100), the first outlet area D and the first outlet area D' are located on the other side of the length direction of the heat exchange plate group (100); the first outlet area D and the first outlet area D' comprise the sealing protrusion (24), one of the first outlet area D and the first outlet area D' in the same channel has the first output hole (8), and the other is blocked and closed by the sealing protrusion (24); the first channel (25) and the third channel (27) are different in the area where the first output hole (8) is located. The plate heat exchanger (200) comprises a first channel (25), a second channel (26) and a third channel (27), the first channel (25), the second channel (26) and the third channel (27) are sequentially arranged and not communicated with each other along the stacking direction of the heat exchange plate group (100), the first channel (25) and the third channel (27) each comprise a first inlet area B and a first inlet area B', the first inlet area B and the first inlet area B' in the same flow passage each comprise the protrusion part (61) and the matching protrusion (201), one of the first inlet area B and the first inlet area B' in the same channel has a distribution hole (60), the first channel (25) and the second channel (26) are different in the area where the distribution hole (60) is located.

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