Plate heat exchanger

Abstract

A plate heat exchanger includes a plurality of stacked plates of identical structure and size, the plurality of plates including a first plate and a second plate adjacent to each other, wherein the second plate is horizontally rotated 180 degrees relative to the first plate to save mold costs. The plate is provided with a plurality of raised points and a plurality of recessed points in a main heat exchange region, wherein the raised points protrude relative to the recessed points on a first surface; wherein a recessed first curved surface structure transitions between two adjacent raised points, and a recessed second curved surface structure transitions between two adjacent recessed points; the lowest point of the first curved surface structure is higher than the recessed point, and the highest point of the second curved surface structure is lower than the raised point; the recessed point on the first plate contacts the raised point on the second plate; the raised point on the first plate is opposite to the recessed point on the second plate, thereby enabling assembly of plates having a dense structure of raised points and recessed points.

Description

Technical Field

[0001] The present application relates to a plate heat exchanger, belonging to the technical field of heat exchangers. Background Art

[0002] In order to achieve a compact and efficient channel structure, the plate heat exchanger in the related technology poses a challenge to the assembly of the plates. If the assembly effect between the plates is not good, such as the welding position is misaligned, it will affect the flow of the fluid on the plates, and ultimately affect the heat transfer performance of the plate heat exchanger. Summary of the Invention

[0003] The purpose of this application is to provide a plate heat exchanger with low cost and good plate assembly effect.

[0004] To achieve the above objectives, the present application adopts the following technical solution: a plate heat exchanger comprising a plurality of stacked plates having the same structure and size, wherein the plurality of plates include a first plate and a second plate adjacent to each other, wherein the second plate is horizontally rotated 180 degrees relative to the first plate; the plate is provided with a main heat exchange region, the plate including a first surface and a second surface opposite to the first surface, wherein the first surface of the second plate is arranged opposite to the second surface of the first plate;

[0005] The plate is provided with a plurality of protruding points and a plurality of concave points in the main heat exchange region, wherein the protruding points protrude relative to the concave points on the first surface; wherein a concave first curved surface structure transitions between two adjacent protruding points, and a protruding second curved surface structure transitions between two adjacent concave points; the lowest point of the first curved surface structure is higher than the concave points, and the highest point of the second curved surface structure is lower than the protruding points; along a plane perpendicular to the stacking direction of the plates, at least a portion of the projection of each protruding point on the plane and at least a portion of the projection of a concave point on the plane are centrally symmetrical about the projection point of the plate center on the plane;

[0006] The concave point of the first plate is in contact with the convex point on the second plate in at least a portion of its area; the convex point of the first plate is opposite to the concave point on the second plate in at least a portion of its area, and a fluid flow space is formed between the adjacent first plate and the second plate;

[0007] The plate is also provided with two first perforations and two second perforations, the first perforations of the first plate are opposite to the second perforations of the second plate and both are connected to the fluid flow space; the plate surface of the first plate around the edge of the second perforations is sealed with the plate surface of the second plate around the edge of the first perforations, so that the second perforations of the first plate and the first perforations of the second plate are both separated from the fluid circulation space.

[0008] In the present application, the first plate is horizontally rotated 180 degrees relative to the second plate, and the structures and sizes of the several plates of the plate heat exchanger are the same. The first plate and the second plate can be manufactured by a set of molds, which saves mold costs and helps to reduce the cumulative tolerance of the plate processing formed when the plates are manufactured by two or more sets of molds. For the plates with multiple protrusions and multiple depressions in the main heat exchange area, the design of the projection positions of the protrusions and depressions of the plates relative to the projection points of the center of the plate along the plane perpendicular to the stacking direction of the plates is conducive to making the plates meet the requirements of self-assembly between the same plates after being rotated 180°, thereby enabling the plate heat exchanger of the present application to realize the assembly of plates with a denser structure of protrusions and depressions, and improving the assembly effect between the plates, thereby improving the heat exchange performance of the plate heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a three-dimensional schematic diagram of the plate heat exchanger of the present application.

[0010] Figure 2 It is a three-dimensional schematic diagram of the plate of this application.

[0011] Figure 3 is a top view of the first plate.

[0012] Figure 4 is a top view of the second plate.

[0013] Figure 5 yes Figure 2 A partial enlarged view of the middle drawing portion M.

[0014] Figure 6 yes Figure 4 A partial enlarged view of the middle frame portion N.

[0015] Figure 7 yes Figure 2 A partial enlarged view of the main heat exchange area.

[0016] Figure 8 It is a partial three-dimensional schematic diagram when two first plates and two second plates are alternately arranged.

[0017] Figure 9 yes Figure 8 3D exploded view of .

[0018] Figure 10 yes Figure 8 Partial main view of .

[0019] Figure 11 It is a partial enlarged view of the protruding structure of the transition zone of the present application in the first embodiment.

[0020] Figure 12 It is a partial enlarged view of the raised structure of the transition zone of the present application in the second embodiment. DETAILED DESCRIPTION

[0021] The exemplary embodiments of the present application will be described in detail below with reference to the accompanying drawings. If there are several specific embodiments, the features of these embodiments can be combined with each other without conflict. When the description refers to the drawings, unless otherwise specified, the same numbers in different drawings represent the same or similar elements. The contents described in the following exemplary embodiments do not represent all embodiments consistent with the present application; rather, they are merely examples of devices, products and / or methods that are consistent with some aspects of the present application and are described in the claims of the present application.

[0022] The terms used in this application are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of this application. The singular forms "a", "an", "the" or "the" used in the specification and claims of this application are also intended to include plural forms, unless the context clearly indicates otherwise.

[0023] It should be understood that the words used in the specification and claims of this application, such as "first", "second" and similar words, do not indicate any order, quantity or importance, but are only used to distinguish the names of features. Similarly, words such as "one" or "an" do not indicate a quantitative limitation, but rather indicate the presence of at least one. Unless otherwise indicated, words such as "upper" and "lower" and similar words appearing in this application are only for the convenience of description and are not limited to a specific position or a spatial orientation. Words such as "include" or "comprises" are open-ended expressions, meaning that the elements appearing before "include" or "comprises" include the elements appearing after "include" or "comprises" and their equivalents, which does not exclude that the elements appearing before "include" or "comprises" may also include other elements. If "several" appears in this application, it means two or more.

[0024] Please refer to Figures 1 to 10 As shown, the present application discloses a plate heat exchanger 100, which includes a plurality of plates 7 stacked and having the same structure and size. The plurality of plates 7 are provided with a first fluid inlet 3, a first fluid outlet 4, a second fluid inlet 5, and a second fluid outlet 6. The plurality of plates 7 include adjacent first plates 1 and second plates 2, wherein the first plates 1 and the second plates 2 are alternately arranged in the thickness direction TT of the plate heat exchanger 100. Please refer to Figure 1 and Figure 10As shown, a fluid flow space 75 is formed between two adjacent first plates 1 and second plates 2. The fluid flow space 75 includes a first fluid flow space 751 connected to the first fluid inlet 3 and the first fluid outlet 4, and a second fluid flow space 752 connected to the second fluid inlet 5 and the second fluid outlet 6. It can be understood that the first fluid flow spaces 751 and the second fluid flow spaces 752 are arranged alternately in the thickness direction TT of the plate heat exchanger 100, for example, the first fluid flow spaces 751 are located in odd-numbered layers, and the second fluid flow spaces 752 are located in even-numbered layers, and vice versa. The first fluid inlet 3 is used to allow the first fluid medium to flow in, and the second fluid inlet 5 is used to allow the second fluid medium to flow in. The first fluid medium and the second fluid medium exchange heat through the plate heat exchanger 100 of this application. Since the working principle of the plate heat exchanger is well known to those skilled in the art, this application will not elaborate on it here.

[0025] The first plate 1 and the second plate 2 are composed of plates 7 with the same structure. Figure 3 and Figure 4 As shown, the second plate 2 is horizontally rotated 180 degrees relative to the first plate 1. With this design, only one set of molds is needed to manufacture the first plate 1 and the second plate 2, saving mold costs.

[0026] Please refer to Figure 3 As shown, the plate 7 is generally rectangular and has a width direction WW and a length direction LL. The plate 7 includes a plate portion 71 and a main heat exchange region 72, wherein the plate portion 71 is located on either side of the main heat exchange region 72 along the length direction LL. The plate 7 includes a first surface 721 (e.g., an upper surface) and a second surface 722 (e.g., a lower surface) opposite the first surface 721. In the embodiment illustrated in this application, the plate portion 71 is provided with two first perforations 711 and two second perforations 712. The two first perforations 711 and the two second perforations 712 are generally distributed at the four corners of the rectangle. In the embodiment illustrated in this application, the two first perforations 711 are aligned along the length direction LL, and the two second perforations 712 are also aligned along the length direction LL. A first perforation 711 and a second perforation 712 on the same side are aligned along the width direction WW, and another first perforation 711 and another second perforation 712 on the same side are also aligned along the width direction WW.

[0027] In the embodiment shown in the present application, the first through hole 711 is a convex hole and the second through hole 712 is a flat hole. Specifically, on the first surface 721 of the plate 7, a first boss 7110 protruding from the plate portion 71 is formed around the first through hole 711 (see Figure 2As shown), the first through-hole 711 is a convex hole and the second through-hole 712 is a plane hole passing through the plate portion 71.

[0028] Furthermore, the plate portion 71 is further provided with a plurality of ribs 715, which protrude relative to the plate portion 71 on the first surface 721. In the illustrated embodiment of this application, the ribs 715 include a plurality of first ribs 7151 located between one first through-hole 711 and one second through-hole 712, and a plurality of second ribs 7152 located between another first through-hole 711 and another second through-hole 712. The plurality of first ribs 7151 and the plurality of second ribs 7152 are symmetrically arranged on either side of the plate 7. The plurality of first ribs 7151 and the plurality of second ribs 7152 each include at least two ribs of different sizes.

[0029] The plate 7 is provided with a plurality of raised points 73 and a plurality of recessed points 74 in the main heat exchange region 72. The raised points 73 are protruding from the first surface 721 relative to the recessed points 74. Figure 7 As shown, the transition between two adjacent convex points 73 is through a concave first curved surface structure 731, and the transition between two adjacent concave points 74 is through a convex second curved surface structure 741. The lowest point 7311 of the first curved surface structure 731 is higher than the concave point 74, and the highest point 7411 of the second curved surface structure 741 is lower than the convex point 73. With this design, these convex points 73 and concave points 74 constitute a dense point wave, and how to assemble the dense point wave to improve the quality is also the technical content involved in this application. In the embodiment shown in the figure of this application, the lowest point 7311 of the first curved surface structure 731 coincides with the highest point 7411 of the second curved surface structure 741. Please refer to Figure 6 As shown, the raised points 73 and recessed points 74 are alternately arranged along the width direction WW and the length direction LL. With a raised point 73 as the center, four recessed points 74 are located adjacent to and surrounding the raised point 73; and with a recessed point 74 as the center, four raised points 73 are located adjacent to and surrounding the recessed point 74.

[0030] For a plate 7, along a plane perpendicular to the stacking direction of the plates 7, the projection of each protruding point 73 on the plane and the projection of a recessed point 74 on the plane are centrally symmetric relative to the projection point of the plate's center on the plane, at least in part. Correspondingly, the projection of each recessed point 74 on the plane and the projection of a protruding point 73 on the plane are centrally symmetric relative to the projection point of the plate's center on the plane, at least in part. It should be noted that the technical terms "protruding point" and "recessed point" used in this application do not refer to a theoretical point, but to a certain raised or recessed unit structure. Since the area occupied by each unit structure itself is very small compared to the area of ​​the plate 7, it is regarded as a "point".

[0031] When the first plate 1 and the second plate 2 are stacked and assembled:

[0032] The first surface 721 of the second plate 2 is disposed opposite to the second surface 722 of the first plate 1; a fluid flow space 75 is formed between the first plate 1 and the second plate 2;

[0033] The first perforation 711 of the first plate 1 is opposite to the second perforation 712 of the second plate 2, and a gap connected to the fluid flow space 75 is formed between the two; the second perforation 712 of the first plate 1 is opposite to the first perforation 711 of the second plate 2, and the plate surface of the first plate 1 around the edge of the second perforation 712 is sealed to the plate surface of the second plate 2 around the edge of the first perforation 711, so that the second perforation 712 of the first plate 1 and the first perforation 711 of the second plate 2 are both separated from the fluid circulation space 75.

[0034] The concave point 74 on the first plate 1 contacts and fixes with the convex point 73 on the second plate 2, and the convex point 73 on the first plate 1 faces the concave point 74 on the second plate 2, thereby achieving self-assembly between the same plates.

[0035] Compared with using two sets of molds to manufacture the first plate 1 and the second plate 2 respectively, the plate 7 manufactured by one set of molds can help reduce the deviation caused by the precision of the two sets of molds themselves, thereby causing assembly problems when the first plate 1 and the second plate 2 are stacked.

[0036] Please refer to Figure 2 and Figure 7As shown, to reduce the difficulty of manufacturing and ensure a better comparison of assembly, the plate 7 also includes a transition zone 76. The presence of transition zone 76 allows the plate 7 to be divided into zones during manufacturing, enabling separate manufacturing of individual zones. This reduces the difficulty of manufacturing and reduces the area that would otherwise require large-area depressions and projections to a smaller area. Transition zone 76 acts as the dividing line between zones and serves as a reference for the dividing line during manufacturing, thereby improving the manufacturing accuracy of each heat exchange zone and reducing manufacturing errors. With respect to the multiple projections 73 and the multiple depressions 74, at least some of the multiple projections 73 and the multiple depressions 74 are distributed along the lengthwise direction LL of the plate 7 on either side of the transition zone 76. As a result, the main heat exchange zone 72 forms a first heat exchange zone 723 and a second heat exchange zone 724 on either side of the transition zone 76, respectively. The multiple raised points 73 and recessed points 74 in the first heat exchange region 723 are evenly distributed, and the multiple raised points 73 and recessed points 74 in the second heat exchange region 724 are evenly distributed. The size of the first heat exchange region 723 along the length direction LL of the plate 7 is equal to the size of the second heat exchanger 722 along the length direction LL of the plate 7. The transition region 76 extends perpendicular to the length direction of the plate 7, and the centerline S2 of the transition region 76 coincides with the centerline S1 of the plate 7 along its width direction WW.

[0037] The size of the transition zone 76 along the length direction LL of the plate can be set according to actual conditions. Taking the protruding points 73 as a reference, multiple protruding points 73 can be arranged in rows along the width direction WW of the plate. The size of the transition zone 76 along the length direction LL of the plate can be set to be able to arrange 1 to 4 rows of protruding points 73. For details, please refer to Figure 7As shown, in the illustrated embodiment of the present application, the plurality of raised points 73 include a plurality of first raised points 733 and a plurality of second raised points 734. In either the first heat exchange zone 723 or the second heat exchange zone 724, the plurality of first raised points 733 form at least one row along the width direction WW of the plate 7, and the plurality of second raised points 734 form multiple rows along the width direction WW of the plate 7. The first raised points 733 are closer to the transition zone 76 than the second raised points 734, and the size of the first raised points 733 is larger than that of the second raised points 734. Accordingly, the plurality of recessed points 74 include a plurality of first recessed points 743 and a plurality of second recessed points 744. The size of the first recessed point 743 is larger than that of the second recessed point 744; along a plane perpendicular to the stacking direction of the plate 7, the projection of each first recessed point 743 on the plane and the projection of a first convex point 731 on the plane are centrally symmetrical with the projection point of the plate's exact center on the plane; the projection of each second recessed point 744 on the plane and the projection of a second convex point 732 on the plane are centrally symmetrical with the projection point of the plate's exact center on the plane.

[0038] Such a design facilitates mold manufacturing. Specifically, when a transition zone 76 is present, the raised points located on either side of the transition zone 76 along the plate length direction LL are relatively far apart. When adjacent plates are assembled, to reduce the risk of loose welding at the distant raised points and plate deformation due to high fluid pressure, which can affect the stability of the plate assembly, the size of the raised points can be appropriately increased. That is, the size of the first raised point 733 closer to the transition zone 76 is appropriately larger than the size of the second raised point 734. This helps to increase the welding area of ​​the first raised point 733, strengthen the plate connection strength in the area near the transition zone 76, and thus improve the overall stability of the plate heat exchanger product.

[0039] In the transition region 76, the plate 7 is provided with a flat portion 761. The flat portion 761 forms a plane on both the first surface 721 and the second surface 722. The flat portion 761 is lower than the raised point 73 and higher than the recessed point 74. When viewed along the width direction WW parallel to the plate 7, the line on the side of the transition region 76 can serve as a marking line to observe whether the first plate 1 and the second plate 2 are aligned during assembly of the plate 7, which helps to improve assembly quality.

[0040] Please refer to Figure 11 As shown, in order to enhance heat exchange, the plate 7 is further provided with a protruding structure 763 in the transition region 76 . The protruding structure 763 protrudes from the flat portion 761 on the first surface 721 .

[0041] In one embodiment, the raised structure 763 includes a plurality of extension segments 762, and the two ends of the extension direction of each extension segment 762 are respectively connected to the two first raised points 733 located on both sides of the transition zone 76. In some cases, the extension direction of each extension segment 762 passes through the center of the two first raised points 733 located on both sides of the transition zone 76 and adjacent to the transition zone 76, and the extension directions of the two adjacent extension segments 762 intersect. The raised structure 763 can be a continuous form, and the raised structure 763 undulates up and down along the width direction WW of the plate 7.

[0042] Please refer to Figure 12 As shown, in another embodiment, at least part of the raised points 73 and the depressed points 74 are distributed in the transition zone 76, so that the plate 7 forms a concave and convex structure in the transition zone 76, and the at least part of the raised points 73 can be the first raised point 733 and / or the second raised point 734.

[0043] The above embodiments are only used to illustrate the present application and are not intended to limit the technical solutions described in the present application. The understanding of the present application should be based on technical personnel in the relevant technical field. Although this specification has described the present application in detail with reference to the above embodiments, ordinary technical personnel in the field should understand that technical personnel in the relevant technical field can still modify or replace the present application with equivalents, and all technical solutions and improvements that do not depart from the spirit and scope of the present application should be included in the scope of the claims of the present application.

Claims

1. A plate heat exchanger comprising a plurality of stacked plates of identical structure and size, the plurality of plates comprising a first plate and a second plate adjacent to each other, the second plate being horizontally rotated 180 degrees relative to the first plate; the plates defining a primary heat exchange region, the plates comprising a first surface and a second surface opposite the first surface, the first surface of the second plate being disposed opposite the second surface of the first plate; The plate is provided with a plurality of protruding points and a plurality of concave points in the main heat exchange region, wherein the protruding points protrude relative to the concave points on the first surface; wherein a concave first curved surface structure transitions between two adjacent protruding points, and a protruding second curved surface structure transitions between two adjacent concave points; the lowest point of the first curved surface structure is higher than the concave points, and the highest point of the second curved surface structure is lower than the protruding points; along a plane perpendicular to the stacking direction of the plates, at least a portion of the projection of each protruding point on the plane and at least a portion of the projection of a concave point on the plane are centrally symmetrical about the projection point of the plate center on the plane; The concave point of the first plate is in contact with the convex point of the second plate in at least a portion of its area; the convex point of the first plate is opposite to the concave point of the second plate in at least a portion of its area, and a fluid flow space is formed between the adjacent first plate and second plate; The plate is further provided with two first through-holes and two second through-holes, the first through-holes of the first plate being opposite to the second through-holes of the second plate and both being in communication with the fluid flow space; the plate surface of the first plate surrounding the edges of the second through-holes is sealedly connected to the plate surface of the second plate surrounding the edges of the first through-holes, so that the second through-holes of the first plate and the first through-holes of the second plate are both isolated from the fluid flow space; The main heat exchange region of the plate includes a transition region, and at least part of the plurality of protruding points and the plurality of recessed points are distributed on both sides of the transition region along the length direction of the plate, so that the main heat exchange region forms a first heat exchange region and a second heat exchange region on both sides of the transition region, respectively; The plurality of raised points include a plurality of first raised points and a plurality of second raised points; In any one of the first heat exchange zone and the second heat exchange zone, a plurality of first protrusions form at least one row along the width direction of the plate, and a plurality of second protrusions form multiple rows along the width direction of the plate; the first protrusions are closer to the transition zone than the second protrusions, and the size of the first protrusions is larger than the size of the second protrusions; Correspondingly, the plurality of concave points include a plurality of first concave points and a plurality of second concave points, and the size of the first concave points is larger than the size of the second concave points.

2. The plate heat exchanger according to claim 1, characterized in that: The center line of the transition zone in the extension direction coincides with the center line of the plate along its width direction, and the size of the first heat exchange zone along the length direction of the plate is equal to the size of the second heat exchange zone along the length direction of the plate.

3. The plate heat exchanger according to claim 2, characterized in that: The plurality of convex points and the plurality of concave points located in the first heat exchange zone are evenly distributed, and the plurality of convex points and the plurality of concave points located in the second heat exchange zone are evenly distributed.

4. The plate heat exchanger according to claim 3, wherein: Along a plane perpendicular to the stacking direction of the plates, the projection of each of the first recessed points on the plane and the projection of a first convex point on the plane are centrally symmetrical with respect to the projection point of the exact center of the plate on the plane; the projection of each of the second recessed points on the plane and the projection of a second convex point on the plane are centrally symmetrical with respect to the projection point of the exact center of the plate on the plane.

5. The plate heat exchanger according to claim 3 or 4, characterized in that: In the transition region, the plate is provided with a flat portion, the flat portion forms a plane on both the first surface and the second surface, and the flat portion is lower than the protruding point and higher than the recessed point.

6. The plate heat exchanger according to claim 5, characterized in that: In the transition area, the plate is further provided with a protruding structure, and the protruding structure protrudes from the flat portion on the first surface.

7. The plate heat exchanger according to claim 6, characterized in that: The protruding structure includes a plurality of extension segments, and both ends of the extension direction of each extension segment are respectively connected to two first protruding points located on both sides of the transition zone, and the extension directions of two adjacent extension segments intersect.

8. The plate heat exchanger according to claim 4, characterized in that: Some of the raised points and some of the sunken points are distributed in the transition zone, so that the plate forms a structure of alternating concave and convex points in the transition zone, and the raised points are the first raised points and / or the second raised points.

9. The plate heat exchanger according to claim 1, characterized in that: With a convex point as the center, there are four concave points around and adjacent to the convex point; with a concave point as the center, there are four convex points around and adjacent to the concave point, and the lowest point of the first curved surface structure coincides with the highest point of the second curved surface structure.

10. The plate heat exchanger according to claim 1, wherein: The plate includes a plate portion located on both sides of the main heat exchange area in the length direction of the plate, the two first through-holes and the two second through-holes are both provided in the plate portion, and a first boss protruding from the plate portion is formed on the circumference of the first through-hole on the first surface of the plate, so that the first through-hole forms a convex hole; the second through-hole is a planar hole passing through the plate portion.

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