WO2020259645A1

WO2020259645A1 - Plate heat exchanger

Info

Publication number: WO2020259645A1
Application number: PCT/CN2020/098332
Authority: WO
Inventors: 李华; 沈世杰
Original assignee: 浙江三花智能控制股份有限公司
Priority date: 2019-06-28
Filing date: 2020-06-26
Publication date: 2020-12-30
Also published as: CN112146484B; CN112146484A

Abstract

Disclosed is a plate heat exchanger (100), comprising a plurality of plates. The plurality of plates comprise a plurality of first plates (1) and a plurality of second plates (2), wherein first protrusions (13) located on first heat exchange faces (11) of the first plates (1) and second protrusions (23) located on third heat exchange faces (21) of the second plates (2) are arranged in a staggered manner; at least some areas of the second protrusions (23) are opposite first flat plate parts (101) of the first plates (1), and at least some areas of the first protrusions (13) are opposite second flat plate parts (201) of the second plates (2); the top part of each of the first protrusions (13) is closer to the second flat plate parts (201) than the top part of each of the second protrusions (23); and the top part of each of the second protrusions (201) is closer to the first flat plate parts (101) than the top part of each of the first protrusions (13). By means of such an arrangement, the heat exchange performance of the plate heat exchanger is improved.

Description

Plate heat exchanger

Cross references to related applications

This patent application claims the priority of the Chinese patent application filed on June 28, 2019 with the application number 201910579121.9 and the invention title "Plate Heat Exchanger". The full text of this application is incorporated herein by reference.

Technical field

This application relates to the field of heat exchange technology, and in particular to a plate heat exchanger.

Background technique

The plate heat exchanger is a kind of equipment that uses corrugated plates as the heat transfer surface to realize the heat exchange between the partition walls. The plate heat exchanger is made up of multiple plates stacked, as shown in Figure 1, a scheme known to the inventor. The point protrusions 31 on the first heat exchange surface 21 on the n plate are staggered with the point grooves 32 on the second heat exchange surface 22 on the n+1 th plate. The first heat exchange surface 21 on the n th plate The top end of the dot-shaped protrusion 31 is welded to the flat surface 221, and so on to multiple plates. This assembly scheme, for refrigerants that require high pressure drop in the channel, the flow cross-section depth of the flow channel on the refrigerant side can be up to 2 times the punching depth Dp, and the plate heat exchanger has a small installation space and Under the requirement of high heat exchange performance, limited by the sheet metal stamping process, the flow channel formed between the plates is not very compact and dense, which is not conducive to the overall heat exchange effect of the plate heat exchanger.

Summary of the invention

This application improves the plate heat exchanger, which is beneficial to improve the heat exchange performance of the plate heat exchanger.

The embodiment of the present application provides a plate heat exchanger, including a plurality of plates, the plurality of plates are stacked to form a plurality of first inter-plate passages and a plurality of second inter-plate passages, and the plurality of plates includes a plurality of A first plate and a plurality of second plates, and the first plate and the second plate are alternately arranged;

Both sides of the first plate are provided with a first heat exchange surface and a second heat exchange surface. The first plate includes a first flat plate portion and a plurality of first protrusions arranged at intervals; On the hot surface, the first convex portion protrudes from the first flat plate portion, and the first convex portion forms a concave portion on the second heat exchange surface;

Both sides of the second plate are provided with a third heat exchange surface and a fourth heat exchange surface. The second plate includes a second flat plate portion and a plurality of second protrusions arranged at intervals; on the third heat exchange surface Surface, the second convex portion protrudes from the second flat plate portion, and the second convex portion forms a concave portion on the fourth heat exchange surface;

The first heat exchange surface of the first plate is opposite to the third heat exchange surface of an adjacent second plate; the second heat exchange surface of the first plate is opposite to another adjacent second plate The fourth heat exchange surfaces of the two plates are opposite; the first inter-plate passage is located between the first heat exchange surface of the first plate and the third heat exchange surface of the adjacent second plate, The second inter-plate passage is located between the second heat exchange surface of the first plate and the fourth heat exchange surface of the adjacent second plate; located on the first heat exchange surface of the first plate The first protruding portion at the position and the second protruding portion located at the third heat exchange surface of the second plate are arranged in a staggered manner, and at least a part of the second protruding portion is aligned with the first plate of the first plate At least part of the area of the first raised portion is opposite to the second flat plate portion of the second plate; the top of the first raised portion is closer to the first than the top of the second raised portion. Two flat portions; the top of the second raised portion is closer to the first flat portion than the top of the first raised portion.

The present application improves the structure of the plate heat exchanger. The first convex portion is a convex structure facing the first inter-plate passage relative to the first flat plate portion, and the second convex portion is also facing the first plate relative to the second flat plate portion. The convex structure of the channel between the plates, and the circulation area of the first channel between the plates is restricted by the above two convex structures, which facilitates the formation of a denser and compact flow channel in the space of the first channel between the plates of the plate heat exchanger The structure, especially for refrigerants that require a higher pressure drop in the channel, is beneficial to improve the heat transfer coefficient of the refrigerant side. On the contrary, for the second plate inter-channel, the first protrusion is relative to the first The flat part is a recessed structure away from the second inter-plate passage, and the second protrusion is also a recessed structure away from the second inter-plate passage relative to the second flat part. The space of the second inter-plate passage of the plate heat exchanger has the above The two recessed structures enhance the fluid mixing effect on the refrigerant side. The assembly structure of the first plate and the second plate is beneficial to improve the overall heat exchange performance of the plate heat exchanger.

Description of the drawings

FIG. 1 is a schematic diagram of a partial structure of a plate described in the background art of this application;

Figure 2 is a schematic cross-sectional structure diagram of a plate heat exchanger according to the application;

Fig. 3 is a schematic diagram of the partial structure of the first plate of the plate heat exchanger of the application;

4 is a schematic diagram of a partial structure of the second plate of the plate heat exchanger according to the application;

5 is a schematic diagram of the channel effect when the plates in FIGS. 3 and 4 are assembled together in this application;

Fig. 6 is a schematic diagram of the passage effect of the first protrusion and the second protrusion at the first heat exchange surface in Fig. 5 of this application;

FIG. 7 is a schematic diagram of the passage effect of the first protrusion and the second protrusion at the third heat exchange surface in FIG. 5 of this application;

Fig. 8 is a schematic diagram of another partial structure of the second plate of the plate heat exchanger according to the present application;

9 is a schematic diagram of the channel effect when the plates in FIGS. 3 and 8 are assembled together in this application;

Figure 10 is a schematic diagram of another partial structure on the first plate of the plate heat exchanger of the present application;

Fig. 11 is a schematic diagram of another partial structure on the second plate of the plate heat exchanger of the application;

Figure 12 is a schematic diagram of the channel effect when the plates in Figure 10 and Figure 11 are assembled together in this application;

Figure 13 is a schematic diagram of the main flow direction and channel structure of the fluid in the plate heat exchanger of the application.

Detailed ways

The plate heat exchanger provided by the present application optimizes the assembly structure between the plates of the plate heat exchanger, which is conducive to the formation of a denser and compact flow channel structure in the plate heat exchanger, which is beneficial to improve the performance of the plate heat exchanger. Heat exchange performance reduces the corresponding refrigerant charge and enhances the channel strength. In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

As shown in FIG. 2, a schematic structural diagram of a plate heat exchanger 100 provided by the present application, which includes a plurality of plates, and the plurality of plates are stacked to form a plurality of first inter-plate passages 3 and a plurality of second inter-plate passages 4, The plurality of plates includes a plurality of first plates 1 and a plurality of second plates 2. The first plate 1 and the second plate 2 are alternately arranged to form the heat exchange core of the plate heat exchanger 100. The first plate 1 and the second plate 2 can be sealed and fixedly connected by means of brazing or the like. The plate heat exchanger 100 shown in FIG. 2 is only illustrated with three layers of first plates 1 and three layers of second plates 2. The actual plate heat exchanger may include more layers of first plates 1 and second plates. Plate 2.

The first plate 1 includes a first flat plate portion 101, both sides of the thickness direction of the first plate 1 have a first heat exchange surface 11 and a second heat exchange surface 12, and the first plate 1 includes a first protrusion 13 On the first heat exchange surface 11, the first convex portion 13 protrudes from the first flat plate portion 101, and the first convex portion 13 forms a concave portion on the second heat exchange surface 12 side. The second plate 2 includes a second flat plate portion 201, the two sides of the second plate 2 in the thickness direction form a third heat exchange surface 21 and a fourth heat exchange surface 22, and the second plate 2 includes a second protrusion 23 On the third heat exchange surface 21, the second convex portion 23 protrudes from the second flat plate portion 201, and the second convex portion 23 forms a concave portion on the fourth heat exchange surface. The first protrusion 13 and the second protrusion 23 can be obtained by pressing or stamping technology.

The first inter-plate passage 3 is located between the first heat exchange surface 11 of the first plate 1 and the third heat exchange surface 21 of the second plate 2, and the second inter-plate passage 4 is located on the second plate 1 Between the heat exchange surface 12 and the fourth heat exchange surface 22 of the second plate 2. For the first plate 1 and the second plate 2 on both sides of the first plate passage 3, the first heat exchange surface 11 of the first plate 1 faces the third heat exchange surface 21 of the second plate 2 The second heat exchange surface 12 of the first plate 1 and the fourth heat exchange surface 22 of the second plate 2 are arranged to face each other.

The first protrusion 13 located at the first heat exchange surface 11 of the first plate 1 and the second protrusion 23 located at the third heat exchange surface 21 of the second plate 2 are arranged in an offset manner, and the second protrusions At least a part of the portion 23 is opposite to the first flat part 101 of the first plate 1, at least a part of the first protrusion 13 is opposite to the second flat part 201 of the second plate 2, and the first protrusion 13 The top part is closer to the second flat part 201 than the top part of the second convex part 23, and the top part of the second convex part 23 is closer to the first flat part 101 than the top part of the first convex part 13.

The first plate 1 and the second plate 2 can be plates of the same structure and size. During assembly, for example, the first plate 1 can be rotated 180 degrees relative to the second plate 2 and then assembled together. The first plate 1 and the second plate 2 can also be plates of different structures and sizes. Correspondingly, the first protrusion 13 and the second protrusion 23 can have the same structure or different structures. It should be understood that the position of the plate heat exchanger 100 at the top and bottom of the heat exchange core also includes relatively flat side plate structures, which are used to keep fluid in the heat exchange core, based on the assembly shown in FIG. 2 The structure can make the flow channel structure on both sides of each plate different, and correspondingly make the flow characteristics of the two fluids involved different. In this way, the inter-plate channel of one fluid of the plate heat exchanger 100 can have the same structure as the other fluid. Relatively high pressure resistance compared to the inter-plate channels. In other words, by designing the size and distribution of the first protrusion 13 and the second protrusion 23, the flow channel can be designed with a specific flow rate and/or pressure drop. At the same time, the plate heat exchanger 100 can also be designed as required The strength of the design size and other parameters.

The second protrusions 23 and the first protrusions 13 are arranged in staggered positions to form an assembling relationship similar to that of an engagement manner. After the first plate 1 and the second plate 2 are assembled, the first protrusions 13 and the second protrusions The raised portions 23 are arranged adjacent to each other. Two adjacent first raised portions 13 can be separated by a second raised portion 23, and two adjacent second raised portions 23 can be separated by a first raised portion. Section 13 is separated. The height of the first protrusion 13 and the second protrusion 23 may be the same or different. During assembly, the first protrusion 13 may be fixedly connected to the second flat portion 201 through the top, and the second protrusion 23 The top part can be fixedly connected to the first flat part 101.

For the first plate 1 and the second plate 2, when the fluid flows on the plate, it can include various forms, such as flowing from the first side of the plate to the opposite second side, that is, the I type loop flow (I -flow) method, or flow from a corner hole on the first side of the plate, flow to the second side opposite to the first side in the length direction of the plate, and then turn back to the other corner hole on the first side, that is, U-shaped U-flow method and so on.

2, the height of the protrusion of the first protrusion 13 relative to the first flat portion 101 is equal to the protrusion height of the second protrusion 23 with respect to the second flat portion 102, and the top of the first protrusion 13 is equal to The second flat portion 201 is welded and fixed. The top of the second convex portion 23 is welded and fixed to the first flat portion 101.

There is a gap V between the first protrusion 13 and the second protrusion 23, and the gap V forms a part of the first inter-plate passage 3.

For the first inter-plate channel 3 formed between the first heat exchange surface 11 of the first plate 1 and the third heat exchange surface 21 of the second plate 2, the first heat exchange of the first plate 1 Both the surface 11 and the third heat exchange surface 21 of the second plate 2 are formed with solder joints. The increase in solder joint density effectively ensures the flow channel strength of the first inter-plate channel 3 and the overall strength of the plate heat exchanger 100. Therefore, under the condition of ensuring the same structural strength, the plate heat exchanger 100 provided by the present invention can be manufactured and processed by a thinner plate material, and has advantages in weight and cost.

Referring to Figures 3 and 4, the plane perpendicular to the stacking direction of the plates can be denoted as the first plane, and the projection of the top of the first protrusion 13 is within the projection range of the entire projection of the first protrusion 13 The projected area of the top of the first protrusion 13 is less than or equal to the projected area of the entire projection of the first protrusion 13, that is, the first protrusion 13 is a truncated cone-shaped protrusion with a lower thickness and a thin upper part. The projection of the top of the second protrusion 23 is within the projection range of the entire projection of the second protrusion 23, and the projected area of the top of the second protrusion 23 is less than or equal to the projected area of the entire second protrusion 23 , That is, the second protrusion 23 is a frustum-shaped protrusion with a lower thickness and a thin upper part.

In some embodiments, the side surface of the first protrusion 13 and the side surface of the second protrusion 23 both have an edge inclination angle of about 45 degrees with respect to the plane. In the cross section along the plate stacking direction, the first protrusion 13 and The cross section of the second protrusion 23 is roughly trapezoidal, which is convenient for pressing or punching.

Of course, the top of the first protrusion 13 may also be approximately the same size as the bottom, and the top of the second protrusion 23 may also be approximately the same size as the bottom of the second protrusion 23.

Both the top of the first protrusion 13 and the top of the second protrusion 23 are provided with a flat part that is convenient for welding or an approximately flat micro-curved part that meets the requirements of assembly and brazing. The following is a unified description of "flat". Wherein, the top of the first protrusion 13 may be all flat, as shown in FIG. 3 in a closed shape with shadows, of course, it may also be partially flat, and the top of the second protrusion 23 may all be flat, as shown in FIG. 4 The shaded closed shape is shown in the middle, of course, it can also be partially flat.

3-9, on the first heat exchange surface 11 of the first plate 1, the first flat plate portion 101 includes a number of unit plate portions 1011, and four first protrusions are arranged around each unit plate portion 1011 13. The plane perpendicular to the stacking direction of the plates is marked as the first plane, and the projection of the first protrusion 13 on the first plane is marked as the first projection B1. The boundary line of the first projection B1 can represent the first projection The location of the junction where the portion 13 and the first flat portion 101 intersect. The four first projections B1 corresponding to the four first projections 13 are fitted with the longitudinal central axes of the four first projections B1 to form a closed quadrilateral S1. The four vertices of the quadrilateral S1 are respectively denoted as (X1, X2, X3, X4). The two first projections B1 corresponding to the two adjacent first heat exchange matching parts 13 are spaced apart at the vertices of the quadrilateral S1. Accordingly, the two first heat exchange matching parts 13 correspond to the quadrilateral on the first flat plate part 101. The positions of the vertices of S1 are spaced apart.

The plurality of second protrusions 23 includes a plurality of first sub-portions 231, the projection of the first sub-portion 231 on the first plane is marked as the second projection B2, and the boundary line of the second projection B2 can represent the first sub-portion 231 and the second projection The location of the junction where the two flat plate parts 102 meet. The top of the first sub-part 231 of the second plate 2 is welded to at least part of the unit plate 1011 of the first plate 1, the center point of the second projection B2 coincides with the center point of the quadrilateral S1, and the first sub-part 231 The corresponding second projection B2 is center-symmetric about the center point of the quadrilateral S1.

In the plane perpendicular to the stacking direction of the plates, the quadrilateral S1 is roughly in the shape of a rhombus or a square. In the diagrams of Figures 3 to 12, the quadrilateral S1 is shown in a diamond shape, and the diamond has a set of opposite obtuse angles and a set of opposite Acute angle.

Specifically, referring to FIG. 3, on the first heat exchange surface 11, four first protrusions 13 are arranged around each unit plate portion 1011. The first protrusion 13 may have a slender extension. The central axes of the four first projections B1 corresponding to the four first protrusions 13 are fitted to form a closed diamond-shaped quadrilateral S1, which is arranged in each The first protrusion 13 on the side has an elongated shape projection along the side. The first projection B1 of the first protrusion 13 may be an elongated oval-like shape, or an elongated square and an irregular elongated shape, and the two adjacent first protrusions 13 correspond to the two second The vertices (X1, X2, X3, X4) of the quadrilateral S1 of a projection B1 are spaced apart, so that an effective fluid that can pass the fluid is formed between the adjacent ends of the two adjacent first protrusions 13 Domain, that is, the import or export of the corresponding location.

4, the third heat exchange surface 21 can also be divided into several unit heat exchange areas according to the position of the quadrilateral S1. The several second protrusions 23 include several first sub-parts 231, and each unit heat exchange area includes one The first sub-parts 231 are arranged according to the center points of the rhombus-shaped quadrilateral. The projection of the first sub-portion 231 on the first plane may be a polygon, such as the shape shown in FIG. 4, or a rhombus, as shown in FIG. 11, or it may be an ellipse, circle, square, or other regular shapes. Or irregular graphics. The top surface of the first sub-section 231 is a plane convenient for welding, the overall projection of the first sub-section 231 is the second projection B2, and the projection of the top surface of the first sub-section 231 on the first plane is recorded as the fourth projection A2.

Refer to Figure 5, Figure 6, Figure 7, where Figure 5 illustrates the channel effect when the first plate 1 and the second plate 2 are assembled together, and the black solid line with arrows in Figure 5 shows the approximate flow of fluid Direction, Figure 6 illustrates the effect of the passage formed by the first protrusion 13 and the second protrusion 23 at the first heat exchange surface 11 after the first plate 1 and the second plate 2 are assembled, and Figure 7 illustrates the first After the plate 1 and the second plate 2 are assembled, the first protrusion 13 and the second protrusion 23 form a channel effect at the third heat exchange surface 21.

Referring to FIG. 6, the top surface of the first protrusion 13 is a plane that is convenient for welding, the overall projection of the first protrusion 13 is the second projection B1, and the top surface of the first sub-portion 231 is the projection of the first plane Recorded as the fourth projection A2. For any vertex of the quadrilateral S1, the vertex is indicated by the vertex X1, and the maximum length of the secondary projection of the fourth projection A2 in the direction perpendicular to the line from the center point O1 of the quadrilateral to the vertex X1 is recorded as the first distance L1, the minimum distance between two first projections B1 adjacent to the vertex X1 is recorded as the second distance L2, and the first distance L1 is greater than the second distance L2.

Referring to FIG. 7, the top surface of the first protrusion 13 is a plane that is convenient for welding. The projection of the top surface of the first protrusion 13 on the first plane is marked as the fifth projection A1, and the first sub-portion 231 The overall projection is the second projection B2, which is indicated by the quadrilateral vertex X1. The maximum length of the secondary projection of the second projection B2 in the direction perpendicular to the line connecting the quadrilateral center O1 to the vertex X1 is recorded as the third distance L3, and the vertex The minimum distance between two adjacent fifth projections A1 of X1 is recorded as the fourth distance L4, and the third distance L3 is greater than the fourth distance L4.

After the first plate 1 and the second plate 2 are assembled, matching the length setting relationship of the first distance L1, the second distance L2, the third distance L3, and the fourth distance L4, it forms a "non-existence" in the main flow direction of the fluid. "Transparent" channel structure, when fluid flows in the channel between the first plates, on the first heat exchange surface 11, please refer to the black curved curves a, b and c in Figure 6 for the fluid flow diagrams, and in the third exchange For hot surface 21, refer to the fluid flow path of black curved curve d, curve e and curve f in Fig. 7. This "opaque" channel structure helps to avoid the shortest path for fluid to flow directly from the inlet to the outlet. The application realizes that the fluid flows along a tortuous path between the first heat exchange surface 11 and the third heat exchange surface 21, especially for refrigerant, the tortuous flow path can effectively improve the refrigerant side The heat transfer coefficient makes the refrigerant side have a longer path along the way, especially the boiling heat transfer and condensation heat transfer process in the two-phase flow state, which produces a better heat transfer enhancement effect.

On the basis of FIG. 4, referring to FIGS. 8 and 9, in some embodiments, the plurality of second protrusions 23 further include a plurality of second sub-portions 232, and the projection of the second sub-portions 232 on the first plane is marked This is the third projection B3, and the center point of the third projection B3 coincides with the vertex of the quadrilateral S1. In FIGS. 8 and 9, in addition to the first sub-portion 231, the plurality of second protrusions 23 also include four second sub-portions 232. The four second sub-portions 232 are respectively along the four vertices (X1) corresponding to the quadrilateral S1. , X2, X3, X4).

In the first plane, the area of the third projection B3 of the second sub-portion 232 is smaller than the area of the second projection B2 of the first sub-portion 231. The second sub-portion 232 can increase the perturbation effect of the fluid on the fluid at the apex position of the quadrilateral S1, and further improve the heat transfer coefficient of the fluid. The third projection B3 of the second sub-portion 232 on the first plane can be circular or elliptical. , Rhombus and various regular or irregular shapes.

There is a gap between the second sub-portion 232 and the first protruding portion 13, which can make the second sub-portion 232 and the ends of the two first protruding portions 13 close to the apex X1 form a space for fluid to pass through. Open up.

10, 11 and 12, different from the structure shown in FIG. 3, the first protrusion 13 includes two straight portions 131 and a curved portion 132, the curved portion 132 is connected to two adjacent straight Between the ends of the extending direction of the portion 131, the two straight portions 131 transition through the rounded corners of the curved portion 132.

On the first heat exchange surface 11 of the first plate 1, the first flat plate portion 101 includes a number of first unit plate portions 1012 and a number of second unit plate portions 1013, each of which is arranged around two first unit plate portions 1012 Opposite the first protrusions 13, the four straight parts 131 corresponding to the two first protrusions 13 are fitted to form a closed first quadrilateral S11 with their central axes in the length direction. Each second unit plate Four straight portions 131 are arranged around the portion 1013. The four straight portions 131 belong to four different first raised portions 13 respectively, and the central axis of the four straight portions 131 in the longitudinal direction is fitted to form Closed second quadrilateral S12.

The plane perpendicular to the stacking direction of the plates is marked as the first plane, the projection of each first protrusion 13 on the first plane is marked as the first projection B1, and two adjacent first protrusions 13 correspond to two The first projections B1 are spaced apart at the vertices of the first quadrilateral S11. Correspondingly, the two adjacent first protrusions 13 are at the positions of the first flat plate portion 101 corresponding to the vertices of the first quadrilateral S11. At intervals.

In some embodiments, two vertices of the first quadrilateral S11 coincide with two vertices of a second quadrilateral S12, and the other two vertices coincide with two vertices of another second quadrilateral S12.

As shown in FIG. 10, two first protrusions 13 are arranged around each first unit plate portion 1012, and the first projection B1 of one of the first protrusions 13 is arranged on two of the first quadrilaterals S11. On adjacent sides, such as m1 and m2, the first projection B1 of another first protrusion 13 is arranged on the other two adjacent sides such as m3 and m4 in the second four-sided row S12.

The two first projections B1 corresponding to two adjacent first protrusions 13 are spaced apart at the vertices (X1, X3) of the first quadrilateral S11. In this way, one of the first protrusions 13 is close to the two ends (a1, a2) of the set of relative vertices (X1, X3) and the other first protrusion 13 is close to the set of relative vertices (X1, X3). The two ends (b1, b2) of) respectively form openings through which fluid can pass.

Taking one of the first quadrilaterals S11 in FIG. 10 as an example, the end a1 of the first protrusion 13 on the left corresponds to the end b1 of the first protrusion 13 on the right, and the first protrusion 13 on the left An opening N1 is formed between the end a1 of the raised portion 13 and the end b1 of the first protrusion 13 on the right side. The end a2 of the first protrusion 13 on the left corresponds to the end b2 of the first protrusion 13 on the right, and the end a2 of the first protrusion 13 on the left corresponds to the first protrusion 13 on the right. The ends b2 of the portion 13 are spaced to form openings N2. When the main flow direction of the fluid is from the opening N2 to the opening N1, correspondingly, the opening N2 can be used as a fluid inlet and the opening N1 can be used as a fluid outlet.

Taking one of the second quadrilateral S12 in FIG. 10 as an example, the first protrusion 13 can form an inlet or an outlet for fluid flow at all four vertices of the second quadrilateral S12.

Referring to FIG. 11, the plurality of second protrusions 23 includes a plurality of fourth sub-portions 234 and a plurality of fifth sub-portions 235, the projection of the fourth sub-portion 234 on the first plane is marked as the sixth projection B4, the fifth sub-portion The projection of 235 on the first plane is recorded as the seventh projection B5.

12, the top of the fourth sub-portion 234 of the second plate 2 is welded to at least part of the first unit plate portion 1012 of the first plate 1, and the top of the fifth sub-portion 235 of the second plate 2 and At least part of the second unit plate portion 1013 of the first plate 1 is welded and fixed.

In some embodiments, the first quadrilateral S11 and the second quadrilateral S12 are both rhombuses with the same shape, and the areas of the first quadrilateral S11 and the second quadrilateral S12 are the same. The center point of the sixth projection B4 coincides with the center point of the first quadrilateral S11, and the center point of the seventh projection B5 coincides with the center point of the second quadrilateral S12. The size and dimensions of the fourth sub-part 234 and the fifth sub-part 235 are the same. The sixth projection B4 is centered on the center of the first quadrilateral S11, and the seventh projection B5 is centered on the center of the second quadrilateral S12. Symmetrically centered.

Figure 12 illustrates the channel effect when the first plate 1 and the second plate 2 are assembled together. The curved black solid line in the figure indicates a general flow direction of the fluid. The fluid flow path is relatively tortuous, which is beneficial to improve the channel. The heat transfer coefficient of the internal fluid is beneficial to improve the heat transfer effect of the plate heat exchanger.

Referring to FIG. 13, in a plane perpendicular to the stacking direction of the plates, the quadrilateral S1 is roughly in the shape of a rhombus, and the direction of the line connecting the vertices of a set of obtuse angles of the rhombus is roughly parallel to the length direction of the plate heat exchanger 100 . In one case, the four corners of the first plate 1 and the second plate 2 are provided with corner holes. When the fluid flows between the plates, it can be along the length of the plate heat exchanger 100 from one side of the plate. The corner hole enters and flows out from the corner hole on the other side of the plate, so that the flow direction of the fluid in the quadrilateral S1 is roughly the same as the main flow direction of the fluid. For example, the black arrow in 12 indicates the main flow direction of the fluid, and the quadrilateral S1 A set of obtuse angles in a diamond shape are used as the main inlet and outlet of the fluid, which is beneficial to uniform distribution of the fluid in the width direction of the plate heat exchanger 100, and is beneficial to improve the heat exchange performance of the plate heat exchanger 100.

Of course, the direction of the line connecting the vertices of the set of acute angles of the rhombus is substantially parallel to the length direction of the plate heat exchanger 100, and the effect of "the above-mentioned opaque" can also be achieved, which is not limited in the present invention.

2, on the basis of the above solution, the plate heat exchanger 100 further includes a fin plate 501, which is arranged on the second heat exchange surface 12 of the first plate 1 and the fourth plate of the second plate 2. Between the heat exchange surfaces 22, the fin plate 501 in FIG. 2 is only partially shown. The fin plate 501 is welded and fixed to at least one of the second heat exchange surface 12 of the first plate 1 and the fourth heat exchange surface 22 of the second plate 2.

For the second inter-plate passage 4 formed between the second heat exchange surface 12 of the first plate 1 and the fourth heat exchange surface 22 of the second plate 2, the second inter-plate passage 4 can communicate with the first The first fluid in the channel 3 between the plates is different from the second fluid. The fin plate 501 can increase the heat transfer area of the second fluid. The fin plate 501 cooperates with the various groove structures of the channel 4 between the second plates to enhance the fluid The blending between them will further improve the heat exchange performance of the plate heat exchanger 100. In addition, in the channel 4 between the second plates, in addition to the channel structure such as the fin plate 501, corrugated plates, wave plates, wire-like fillers, porous media, etc. can also be used to achieve the structure of the second plate. Under the premise of the strength of the inter-channel, these methods will also enhance the effects of turbulence, mixing, and increase of the heat exchange area of the fluid in the second inter-plate channel, ultimately achieving enhanced heat transfer and improving the performance of the plate heat exchanger product.

The plate heat exchanger provided by the present invention has been described in detail above. Specific examples are used in this article to illustrate the principle and implementation of the present invention. The description of the above examples is only used to help understand the core idea 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 modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

A plate heat exchanger includes a plurality of plates, the plurality of plates are stacked to form a plurality of first inter-plate passages and a plurality of second inter-plate passages, and the plurality of plates include a plurality of first plates and a plurality of A second plate, and the first plate and the second plate are alternately arranged;

Both sides of the first plate are provided with a first heat exchange surface and a second heat exchange surface. The first plate includes a first flat plate portion and a plurality of first protrusions arranged at intervals; On the hot surface, the first convex portion protrudes from the first flat plate portion, and the first convex portion forms a concave portion on the second heat exchange surface;

Both sides of the second plate are provided with a third heat exchange surface and a fourth heat exchange surface. The second plate includes a second flat plate portion and a plurality of second protrusions arranged at intervals; on the third heat exchange surface Surface, the second convex portion protrudes from the second flat plate portion, and the second convex portion forms a concave portion on the fourth heat exchange surface;

The first heat exchange surface of the first plate is opposite to the third heat exchange surface of the second plate; the second heat exchange surface of the first plate is opposite to the fourth heat exchange surface of the second plate; The first inter-plate passage is located between the first heat exchange surface of the first plate and the adjacent third heat exchange surface of the second plate, and the second inter-plate passage is located on the first heat exchange surface. Between the second heat exchange surface of one plate and the fourth heat exchange surface of the adjacent second plate; the first protrusion located at the first heat exchange surface of the first plate is located at the second The second protrusions on the third heat exchange surface of the plate are arranged in a staggered manner. At least a part of the second protrusions is opposite to the first flat plate portion of the first plate. At least a part of the area is opposite to the second flat part of the second plate; the top of the first protrusion is closer to the second flat part than the top of the second protrusion; the second protrusion The top of the first protrusion is closer to the first flat portion than the top of the first protrusion.
The plate heat exchanger according to claim 1, wherein the height of the first protrusion relative to the first flat part is equal to the height of the second protrusion relative to the second flat part. , The top of the first protrusion and the second flat part are welded and fixed at least in part; the top of the second protrusion and the first flat part are welded and fixed at least in part; the first protrusion There is a gap between the raised portion and the second convex portion.
The plate heat exchanger according to claim 2, characterized in that, on the first heat exchange surface of the first plate, the first flat plate portion includes a plurality of unit plate portions; Four first protrusions are arranged around; the plane perpendicular to the stacking direction of the plates is marked as the first plane, and the projection of the first protrusion on the first plane is marked as the first projection; the four first The central axes of the four first projection length directions corresponding to the protrusions are fitted to form a closed quadrilateral, and two adjacent first protrusions are spaced apart at the positions of the first flat plate portions corresponding to the vertices of the quadrilateral ；

The plurality of second protrusions includes a plurality of first sub-portions; the projection of the first sub-portion on the first plane is marked as the second projection; the top of the first sub-portion of the second plate is connected to the first At least part of the unit plate portion of the plate is welded and fixed; the center point of the second projection coincides with the center point of the quadrilateral.
The plate heat exchanger according to claim 3, wherein the plurality of second protrusions further include a plurality of second sub-portions; the projection of the second sub-portion on the first plane is marked as the third projection; The center point of the third projection coincides with the vertex of the quadrilateral.
The plate heat exchanger according to claim 4, wherein the quadrilateral is a rhombus, and the quadrilateral has a set of opposite obtuse angles and a set of opposite acute angles; the second projection corresponding to the first subsection is The center point of the quadrilateral is center-symmetric.
The plate heat exchanger according to claim 5, wherein the top surface of the first sub-section is a plane, and the projection of the top surface of the first sub-section on the first plane is recorded as the fourth projection ; For any vertex of the quadrilateral, the maximum length of the secondary projection of the fourth projection in the direction perpendicular to the line from the center point of the quadrilateral to the vertex is recorded as the first distance, adjacent to the vertex The minimum distance between the two first projections of is recorded as the second distance, and the first distance is greater than the second distance;

The top surface of the first protrusion is a plane; the projection of the top surface of the first protrusion on the first plane is recorded as the fifth projection; for any vertex of the quadrilateral, The maximum length of the secondary projection of the second projection in the direction perpendicular to the line connecting the center of the quadrilateral to the vertex is recorded as the third distance, and the minimum distance between the two fifth projections adjacent to the vertex is recorded as the fourth The third distance is greater than the fourth distance.
The plate heat exchanger according to claim 6, wherein the projection area of the fifth projection is smaller than the projection area of the first projection, and the fifth projection is located within the range of the first projection; The projection area of the fourth projection is smaller than the projection area of the second projection, and the fourth projection is within the range of the second projection;
The plate heat exchanger of claim 5, wherein the third projection is circular, and the projection area of the third projection is smaller than the projection area of the second projection.
The plate heat exchanger according to any one of claims 5 to 8, wherein the direction of the obtuse angle bisector of the quadrilateral coincides with the length direction of the plate heat exchanger.
The plate heat exchanger according to claim 2, wherein the first protrusion includes two straight portions and a curved portion; the straight portion has an extension direction along a straight line, and the curved portion It is connected between the ends of two adjacent straight portions in the extending direction, and the two straight portions transition through the rounded corners of the curved portions.
The plate heat exchanger according to claim 10, characterized in that, on the first heat exchange surface of the first plate, the first flat plate portion includes a plurality of first unit plate portions and a plurality of second unit plate portions; There are two first protrusions arranged around each of the first unit plate parts; the central axes of the four straight parts corresponding to the two first protrusions are fitted to form a closed First quadrilateral

Four straight portions are arranged around each of the second unit plate portions, and the four straight portions belong to four different first convex portions, and the central axis of the four straight portions in the longitudinal direction is Fitting to form a closed second quadrilateral; two adjacent first protrusions are spaced apart at the position of the first flat plate portion corresponding to the vertex of the first quadrilateral.
The plate heat exchanger according to claim 11, wherein the plurality of second protrusions includes a plurality of fourth sub-portions and a plurality of fifth sub-portions;

The top of the fourth sub-portion of the second plate is welded and fixed to at least a part of the first unit plate portion of the first plate; the fifth sub-portion of the second plate The top is welded and fixed to at least a part of the second unit plate portion of the first plate.
The plate heat exchanger according to claim 13, wherein the first quadrilateral and the second quadrilateral are both rhombuses with the same shape, and the first quadrilateral and the second quadrilateral The areas of the polygons are equal; the projection of the fourth subsection on the first plane is recorded as the sixth projection, and the projection of the fifth subsection on the first plane is recorded as the seventh projection; The central point coincides with the central point of the first quadrilateral, and the central point of the seventh projection coincides with the central point of the second quadrilateral.
The plate heat exchanger according to claim 12 or 13, wherein the size and dimensions of the fourth sub-part and the fifth sub-part are the same, and the sixth projection is based on the first four sides The center point of the shape is center-symmetric, and the seventh projection is center-symmetric about the center point of the second quadrilateral.
The plate heat exchanger according to claim 1, wherein the plate heat exchanger further comprises a plurality of fin plates, and the fin plates are arranged on the second heat exchange surface of the first plate and the phase Between the fourth heat exchange surface of the adjacent second plate; the fin plate at least exchanges with the second heat exchange surface of the first plate and the fourth heat exchange surface of the second plate One of the heat exchange surfaces is welded and fixed.