Plate Heat Exchanger

Abstract

A plate heat exchanger includes a first plate and a second plate; the front side of the first plate is opposite to the back side of the second plate; the first plate has a first plate portion and a plurality of first protrusion structures located in its main heat exchange area; the second plate has a second plate portion and a plurality of second protrusion structures located in its main heat exchange area; the protrusion structure has a plurality of extension sections and a plurality of connecting sections, each connecting section is respectively connected between the ends of the extension direction of two adjacent extension sections; at least one plate satisfies that the number of cross positions formed by the protrusion structure belonging to the plate at each extension section thereof contacting the extension section of the protrusion structure of another plate is two. The present application is conducive to improving the heat exchange performance of the plate under the condition of lower flow pressure drop.

Description

Technical Field

[0001] The present application relates to the field of heat exchange technology, and in particular to a plate heat exchanger. Background Art

[0002] Plate heat exchangers are widely used in refrigeration and air conditioning, new energy vehicles and other industries. In related technologies, the plates of plate heat exchangers have a corrugated structure with herringbone wave characteristics, and the angles of the herringbone waves of two adjacent plates are assembled in opposite directions to form a fluid channel.

[0003] Related technologies exist such as Figure 1 The plate shown in the figure has a wave angle of 90° for the herringbone wave and has continuous multiple herringbone waves of about 3 multiplicities in the width direction of the plate; Figure 2 The plates are shown in a top view, with the contact points between two adjacent plates marked with circles.

[0004] However, the plate heat exchanger of the related art still has room for improvement in providing better heat exchange performance under lower fluid pressure drop conditions. Summary of the invention

[0005] The object of the present application is to provide a plate heat exchanger which provides better heat exchange performance under lower pressure drop conditions.

[0006] The present application adopts the following technical scheme: a plate heat exchanger, comprising a plurality of stacked plate assemblies, the plate assemblies comprising a first plate and a second plate; the front side of the first plate is opposite to the back side of the second plate, and the back side of the first plate is opposite to the front side of the second plate of the adjacent plate assembly; the first plate and the second plate are both provided with a main heat exchange area; the first plate has a first plate portion located in its main heat exchange area and a plurality of first protrusion structures, the plurality of first protrusion structures are spaced apart from each other and the first protrusion structure protrudes relative to the first plate portion on the front side of the first plate; the second plate has a second plate portion located in its main heat exchange area and a plurality of second protrusion structures, the plurality of second protrusion structures are spaced apart from each other and the second protrusion structure protrudes relative to the second plate portion on the back side of the second plate; the protrusion structure has a plurality of extension sections and a plurality of connecting sections, each connecting section is respectively connected between the ends of the extension direction of two adjacent extension sections;

[0007] Among them, the first protruding structure is in contact with the second protruding structure at its extended section and is cross-arranged; and at least one of the first plate and the second plate satisfies that the number of intersection positions formed by the protruding structure belonging to the plate at each extended section thereof contacting the extended section of the protruding structure of another plate is two.

[0008] The present application constrains the number of cross positions at which the protruding structure of at least one plate of the plate assembly is used to contact and fix the protruding structure of another adjacent plate at each extension section to be two, which is conducive to shortening the size of the extension section of the protruding structure of the plate, so that the protruding structure of the plate forms more extension sections and connecting sections under the condition of limited plate width. The plate relies on the position of multiple connecting sections to block the flow trend of the fluid in the channel along the extension direction of the extension section, and the multiple deflections of the relatively large number of connecting sections to the fluid groove movement are conducive to enabling the fluid to obtain a better longitudinal flow effect along the main flow direction. This is conducive to reducing the fluid flow pressure drop, and the relatively short extension section and the multiple deflections of the connecting section are conducive to a good mixing effect of the gas phase working medium and the liquid phase working medium, which is conducive to the effective entrainment of the gas phase working medium and the liquid phase working medium, and the corresponding fluid evaporation process will obtain a better enhanced heat exchange effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a structural schematic diagram of a plate provided by the related technology of this application;

[0010] Figure 2 It is a schematic top view of a part of the plate area enlarged by the related technology of this application;

[0011] Figure 3 It is a structural schematic diagram of a plate heat exchanger provided in an embodiment of the present application;

[0012] Figure 4 This is a schematic diagram of an exploded structure for the first plate and the second plate in the embodiment of the present application;

[0013] Figure 5 is a schematic structural diagram of a first plate provided in an embodiment of the present application;

[0014] Figure 6 is a top view schematic diagram of an assembly of a first plate and a second plate provided in an embodiment of the present application;

[0015] Figure 7 is a top view schematic diagram of another assembly of a first plate and a second plate provided in an embodiment of the present application;

[0016] Figure 8 It is an enlarged view of a partial area structure of a first plate provided in an embodiment of the present application;

[0017] Fig. 9 yes Figure 8 Schematic diagram of the cross section in the AA direction;

[0018] Fig.10 is a top view schematic diagram of another assembly of a first plate and a second plate provided in an embodiment of the present application;

[0019] Fig.11 is an enlarged view of a partial area structure of another first plate provided in an embodiment of the present application;

[0020] Fig.12 yes Fig.11 A schematic diagram of the structure of a separate partial area of ​​the first plate;

[0021] Fig.13 yes Fig.11 A schematic cross-sectional view of a first plate and a corresponding second plate after being assembled at a connecting section along the length direction of the plate;

[0022] Fig.14 is an enlarged view of a partial area structure of another first plate provided in an embodiment of the present application;

[0023] Fig.15 yes Fig.14 An enlarged view of a partial area structure of the first plate from another viewing angle;

[0024] Fig.16 is a cross-sectional schematic diagram of a first plate with an asymmetric channel structure provided in an embodiment of the present application;

[0025] Fig.17 It is a cross-sectional schematic diagram of a second plate with an asymmetric channel structure provided in an embodiment of the present application. DETAILED DESCRIPTION

[0026] For plate heat exchangers, the herringbone wave technology forms plates by arranging ridges and grooves in a periodic alternating "herringbone" pattern on the plates. Two adjacent flow plates are assembled in a herringbone pattern with sharp angles facing each other to form a fluid channel. It has the technical characteristics of high turbulence and good heat exchange effect, and is widely used in refrigeration and air conditioning, refrigeration and freezing, automobiles, aerospace, etc.

[0027] For a plate heat exchanger having a corrugated structure with a herringbone wave-like shape, the flow of the fluid in the wave groove of the herringbone wave is decomposed into a furrow flow along the groove and a longitudinal flow roughly along the main flow direction formed between the inlet and outlet of the plate.

[0028] The plate heat exchanger provided in the present application has a plate structure that designs and improves the flow and heat exchange mechanism at the "extension section" and "connection section" of the protruding structure, and combines the plate assembly relationship to propose an innovative solution. The technical solution of the present application is described in detail below.

[0029] like Figure 3As shown, one embodiment of the present application relates to a plate heat exchanger 10, comprising a plurality of stacked plate assemblies 100.

[0030] Figure 4 The schematic diagram of the exploded view of the plate assembly 100 is shown, the plate assembly 100 includes a first plate 101 and a second plate 102, each plate includes a front side 1001 and a back side 1002 opposite to each other, the front side 1001 of the first plate 101 is opposite to the back side 1002 of the second plate 102, and the back side 1002 of the first plate 101 is opposite to the front side 1001 of the second plate 102 of the adjacent plate assembly 100. Specifically, the plate edges of the first plate 101 and the second plate 102 both have a flange 21, and the side where the flange 21 is folded is defined as the back side 1002 of the plate, and the other side is the front side 1001 of the plate. Figure 4 In the figure, the visible side of the first plate 101 at the bottom is its front side 1001, and the invisible side is its reverse side 1002; the visible side of the second plate 102 at the top is its reverse side 1002, and the invisible side is its front side 1001.

[0031] The first plate 101 and the second plate 102 are both provided with a main heat exchange area 20. Along the length direction of the plate, the plate also has corner hole areas located on both sides of the main heat exchange area 20. The corner hole areas are provided with through holes penetrating the plate, and fluid flows in and out through the through holes. The main heat exchange area 20 extends from the middle position of the plate to the corner hole area.

[0032] Of course, the plate heat exchanger 10 product may also include external pipes 11 corresponding to the inlet and outlet of two fluids, namely, the refrigerant and the brine. The external pipes 11 corresponding to the two fluids may be located on the same side or different sides of the thickness direction of the plate heat exchanger 10. Figure 3 In the figure, the external pipes 11 are shown as being located on different sides of the plate heat exchanger 10. The number of the external pipes 11 may be four, two of which are used as inlet and outlet pipes of the refrigerant, and the other two are used as inlet and outlet pipes of the secondary coolant.

[0033] The first plate 101 has a first plate portion 12 and a plurality of first protruding structures 13 located in its main heat exchange area 20. The plurality of first protruding structures 13 are arranged at intervals from each other and the first protruding structures 13 protrude from the first plate portion 12 on the front surface 1001 of the first plate 101. A first groove 14 is formed between two adjacent first protruding structures 13.

[0034] The second plate 102 has a second plate portion 22 and a plurality of second protruding structures 23 located in its main heat exchange area 20. The plurality of second protruding structures 23 are arranged at intervals from each other and the second protruding structures 23 protrude from the second plate portion 22 on the reverse side 1002 of the second plate 102. A second groove 24 is formed between two adjacent second protruding structures 23.

[0035] The first protrusion structures 13 are arranged at a certain distance from each other on the main heat exchange area 20 of the first plate 101, and the spacing between the multiple first protrusion structures 13 can be equal or unequal. The second protrusion structures 23 are arranged at a certain distance from each other on the main heat exchange area 20 of the second plate 102, and the spacing between the multiple second protrusion structures 23 can be equal or unequal.

[0036] The first protruding structure 13 and the second protruding structure 23 each have at least two extension segments 31 and at least one connecting segment 32, and each connecting segment 32 is connected between the ends of two adjacent extension segments 31 in the extension direction. In some embodiments of the present application, the first protruding structure 13 and the second protruding structure 23 each have a plurality of extension segments 31 and a plurality of connecting segments 32, Figure 6 , Figure 7 As shown in the figure, the continuous patterns formed by the first protruding structure 13 and the second protruding structure 23 are both multiple continuous herringbone corrugated patterns.

[0037] Among them, the first protruding structure 13 contacts the second protruding structure 23 at its extension section 31 and the two are arranged crosswise, and at least one of the first plate 101 and the second plate 102 satisfies that the number of intersection positions formed by the protruding structure belonging to the plate at each extension section 31 of the plate contacts the extension section of the protruding structure of another adjacent plate is two.

[0038] In practice, the first plate 101 and the second plate 102 can be fixed by brazing, and a welding point is formed at the intersection. The position of the welding point can be referred to Figure 6 , Figure 7 The dotted circle box indicates Figure 6 and Figure 7 In the figure, the solid line graphic represents the top surface of the first protruding structure 13 facing the back surface 1002 of the second plate 102, and the dotted line graphic represents the top surface of the second protruding structure 23 facing the front surface 1001 of the first plate 101.

[0039] When the plate heat exchanger product is used as an evaporator, the design concept is to entrain the liquid working medium with the gaseous working medium and pass through the flow channel formed between multiple plates. Due to the characteristics of the gas-liquid two-phase flow itself, the gaseous working medium is easily affected by the buoyancy and leaves the flow channel along the shortest path, that is, it tends to flow along the main flow direction. The liquid working medium is affected by the liquid viscosity and tends to flow in the direction of minimum pressure drop, that is, it tends to flow in the groove direction. In order to achieve effective entrainment of the two, the flow form along the main flow direction of the plate is an ideal choice. The method provided in the present application is that under the condition of limited plate surface width, the number of intersection positions formed by constraining the extension section 31 of the first protrusion structure 13 to contact the extension section 31 of the second protrusion structure 23 is 2, so that the size of the extension section 31 can be reduced, so that more extension sections 31 and connecting sections 32 can be formed in the plate width direction. Thus, it is conducive to forming a continuous herringbone wave with a large number of multiplies. On the one hand, the connecting section 32 of the first protruding structure 13 is in contact with the connecting section 32 of the second protruding structure 23, which is conducive to improving the fixing strength between the plates and the plates, and improving the product strength and stability of the plate heat exchanger 10. On the other hand, the plate relies on the position of multiple extension sections 31 to allow the fluid to flow and exchange heat in the groove with a smaller flow resistance, and the plate relies on the position of multiple connection sections 32 to block the flow trend of the fluid along the groove direction, ensuring the baffle effect of the fluid movement, which is conducive to switching the fluid flow mode to a longitudinal flow formed in the main flow direction between the fluid inlet and outlet, and is conducive to reducing the fluid flow pressure drop. In this way, the more the multiplies of the herringbone wave, the easier it is for the fluid to change to the longitudinal flow mode, which is conducive to reducing the fluid flow pressure drop, and for the gas-liquid two-phase refrigerant, the size reduction of the extension section 31 and the multiple baffles of the connection section 32 make the fluid mixing effect of the two-phase flow form good, which is conducive to the effective entrainment of both the gas phase and the liquid phase working medium, and the corresponding fluid evaporation process will obtain a better enhanced heat exchange effect.

[0040] like Figure 6 As shown, the extension section 31 has a generally straight extension direction, and the connecting section 32 extends along a curved path, so that the center line of the first protruding structure 13 in its extension direction and the center line of the second protruding structure 23 in its extension direction both form a continuous bending shape. Extending the connecting section 32 in a curved path is conducive to making the flow path of the fluid relatively smooth and smooth, which is conducive to reducing the pressure drop of the fluid flow and improving the heat exchange effect. Of course, in other embodiments, the extension section 31 and the connecting section 32 both have a generally straight extension direction, and the center line of the first protruding structure 13 in its extension direction and the center line of the second protruding structure 23 in its extension direction form a continuous trapezoidal shape. Alternatively, the extension section 31 and the connecting section 32 both extend along a curved path, and the center line of the first protruding structure 13 in its extension direction and the center line of the second protruding structure 23 in its extension direction form a continuous wave shape, etc.

[0041] For the first plate 101 and the second plate 102, the length direction L of the plate constitutes the main flow direction of the fluid, that is, the fluid flows from one side to the other side in the length direction L of the plate. The first protruding structure 13 and the second protruding structure 23 both rise and fall in the plate width direction W in a continuous undulating corrugated form. Of course, the first protruding structure 13 and the second protruding structure 23 can also rise and fall in a direction deviating from the plate width direction W by a certain angle in a continuous corrugated form.

[0042] The first convex structure 13 and the second convex structure 23 both form continuous multiple herringbone waves along the width direction W of the plate, wherein the herringbone wave with a complete undulation is recorded as one herringbone wave, the multiplicity of the herringbone wave formed by the first convex structure 13 is the same as the multiplicity of the herringbone wave formed by the second convex structure 23, and the multiplicity of the multiple herringbone waves of the first convex structure 13 and the second convex structure 23 can be 3 or more. Each herringbone wave formed by the first convex structure 13 can have the same shape and size, or can be of different shapes and sizes, for example, one of the herringbone waves is a symmetrical herringbone wave along the length direction of the plate, and one of the two adjacent extensions of the other herringbone wave deviates from an angle of 45° to one side of the plate width direction relative to the length direction of the plate, and the other extension deviates from an angle of 60° to the other side of the plate width direction relative to the length direction of the plate. Correspondingly, each herringbone wave formed by the second convex structure 23 can be the same as or different from other herringbone waves, and this application does not limit this.

[0043] The multiple herringbone waves formed by any of the first protruding structures 13 and the second protruding structures 23 along the width direction of the plate are continuous periodic patterns, that is, the structure and shape of each herringbone wave are the same, such as Figure 5 As shown, the periodic pattern formed by the first protruding structure 13 and the periodic pattern formed by the second protruding structure 23 differ by half a period based on the assembly relationship between the two, thereby forming a herringbone sharp corner and a sharp corner reverse assembly relationship. The first plate 101 and the second plate 102 are plates of the same shape and structure, so the periodic pattern formed by the first protruding structure 13 and the periodic pattern formed by the second protruding structure 23 are the same. During assembly, the first plate 101 is horizontally rotated 180° relative to the second plate 102.

[0044] In one embodiment of the present application, the first protrusion structure 13 and the second protrusion structure 23 both extend from one side edge of the corresponding plate width direction W to the other side edge, and for any protrusion structure, the protrusion structure intersects with the edge of the plate at the connecting section 32 or intersects with the edge of the plate at the intersection position of the extension section 31.

[0045] like Figure 5As shown in the figure, along the width direction W of the plate, the first protruding structure 13 is a 7-fold integer herringbone wave, each of which is a continuous and complete form, and the two adjacent extensions of each herringbone wave are arranged symmetrically about the length direction L of the plate. In this way, after the first plate 101 and the second plate 102 are assembled, the first plate 101 is used as an example for explanation. Figure 5 The length of the extension section 31 of the edge of the first protrusion structure 13 closest to the width direction W of the plate in the extension direction is the total length of the corresponding extension section 31 in the extension direction in the complete form. When the two plates are fixed by welding, the position of the welding point is located at the intersection with the edge of the plate, which is beneficial to enhance the stability of the plate at the edge of the plate.

[0046] Apart from Figure 5 As shown in , in addition to the way that the first protruding structure 13 intersects with the edge of the plate at the connecting section 32, the first protruding structure 13 can also intersect with the edge of the plate at the intersection position of the extension section 31. Setting the position of the welding point at the intersection of the extension section 31 and the edge of the plate is conducive to avoiding the formation of a narrow gap between the welding point and the edge of the plate, so that the fluid is not easy to pass through, avoiding the formation of a flow dead zone to reduce the utilization rate of the plate surface, and is conducive to improving the uniformity of the distribution of the fluid on the plate, expanding the effective heat exchange area of ​​the plate, and improving the heat exchange effect of the plate heat exchanger.

[0047] In other embodiments of the present application, at least one plate among the first plate 101 and the second plate 102 satisfies that the number of intersection positions formed by contact with the extension segment 31 of the protruding structure of another plate at each extension segment 31 of the protruding structure is two, and the plate also satisfies that the included angle of the extension direction fitting of at least one group of two adjacent extension segments 31 belonging to the plate is non-right angle.

[0048] Under the wave pitch parameters that meet the requirements of mold forming and structural strength, the plate with an obtuse angle of the herringbone wave has a larger flow resistance of the fluid along its main flow direction, but has relatively good heat exchange performance. The plate with an acute angle of the herringbone wave has a smaller flow resistance of the fluid along its main flow direction, although the heat exchange performance is not higher than that of the obtuse angle. By constraining the extension direction of at least one group of adjacent extension sections 31 on at least one plate to have an angle of non-90°, it is beneficial to switch the primary and secondary positions of the heat exchange effect and the fluid pressure drop to adapt to different working conditions and meet the application scenarios of the plate heat exchanger products.

[0049] In some application scenarios, among the multiple extension segments 31, the extension directions of two adjacent extension segments 31 deviate at equal angles from the plate length direction L to both sides of the plate width direction W. The extension lengths of the two adjacent extension segments 31 are also equal. Fig.10As shown, the solid line indicates the structure of the first protruding structure 13, the dotted line indicates the structure of the second protruding structure 23, the angle of extension direction fitting of two adjacent extension sections 31 corresponding to the first protruding structure 13 of the first plate 101 is recorded as the first angle β1, and the angle of extension direction fitting of two adjacent extension sections 31 corresponding to the second protruding structure 23 of the second plate 102 is recorded as the second angle β2.

[0050] The first angle β31 and the second angle β32 are different in angle. The first angle β1 is approximately an obtuse angle of 120°, and the second angle β2 is approximately a right angle of 90°.

[0051] Of course, the first angle β1 and the second angle β2 may also be the same. In practice, at least one of the first angle a1 and the second angle a2 is not 90°. For example, the first angle β1 and the second angle β2 are both assembled as two acute angles, or the first angle β1 and the second angle β2 appear in a mixed assembly, the first angle β1 is 60°, the second angle β2 is 90°, or the first angle β1 is 80°, the second angle β2 is 100°.

[0052] When other parameters of the plate remain unchanged, when the included angle of the extension direction fitting of two adjacent extension sections of the protruding structure is an acute angle, it is beneficial to make the protruding structures arranged along the width direction of the plate have more extension sections and connecting sections under the condition of limited plate width, the number of periodic patterns formed by the protruding structures increases, and the multiplicity of the herringbone waves increases, which correspondingly has certain advantages in pressure drop and heat exchange.

[0053] like Figure 8 and Fig. 9 As shown, for any one of the first plate 101 and the second plate 102, the ratio X between the spacing L1 between the center lines of two adjacent protruding structures in the extension direction and the depth D of the groove bottom between the two adjacent protruding structures relative to the top surface of the protruding structure is in the range of 2.5≤X≤6.

[0054] Under the condition that the depth D of the groove bottom between two adjacent protrusion structures relative to the top surface of the protrusion structure is certain, if the spacing between the center lines of the extension direction of the extension sections 31 of the two adjacent protrusion structures is too large, it will make it difficult for the fluid to enhance the heat exchange through a winding flow path. If the spacing is too small, the cross positions of the protrusion structures used for welding will be too dense, resulting in excessive overall flow resistance, affecting the final heat exchange effect.

[0055] In other embodiments provided in the present application, the first protruding structure 13 and the second protruding structure 23 each include a plurality of substructures consisting of two adjacent extension segments 31 and a connecting segment 32 located therebetween. Fig.11 , Fig.12As shown in the figure, the substructure S1 of the first protruding structure 13 includes a top 41 and two side portions 42, and the two side portions 42 are respectively connected to the two sides of the top 41. In the direction pointed by the sharp angle formed by the extension directions of two adjacent extension segments 31 of each substructure S1, the two side portions 42 respectively form the front side and the rear side of the substructure S1, and the one forming the front side of the two side portions 42 is recorded as the first side portion 421, and the one forming the rear side of the two side portions 42 is recorded as the second side portion 422.

[0056] The first side portion 421 and the second side portion 422 are local concepts corresponding to the substructure S1. The first side portion 421 and the second side portion 422 are distinguished by the leading edge and the trailing edge of the herringbone corrugation corresponding to the substructure S1. That is to say, for a certain side portion of the first protruding structure 13, it may form the first side portion 421 or the second side portion 422 in different substructures S1.

[0057] Among them, there is at least one plate in the first plate 101 and the second plate 102 that satisfies the following conditions. Taking the first plate 101 as an example, the first plate 101 has two intersection positions formed by contacting the extension section 31 of the second convex structure 23 of the second plate 102 at each extension section 31 of the first convex structure 13. At the same time, the first plate 101 also satisfies that the second side portion 422 of at least one substructure S1 forms a recessed portion 263 recessed in the direction indicated by the sharp angle in at least a partial area of ​​the connecting section 32, and the recessed area corresponding to the recessed portion 263 forms a part of the fluid channel for the flow of the first fluid, and / or the first side portion 421 of at least one substructure forms a convex portion 264 protruding in the direction indicated by the sharp angle in at least a partial area of ​​the connecting section 32, and the recessed area formed by the convex portion 264 on the opposite side of the plate forms a part of the fluid channel for the flow of the second fluid.

[0058] Relative to the plane where the top 41 is located, the slope of the second side portion 422 corresponding to the concave portion 263 is smaller than the slope of other positions of the second side portion 422. The slope of the first side portion 421 corresponding to the convex portion 264 is smaller than the slope of other positions of the first side portion 421.

[0059] A more gentle slope structure, namely the convex part 264 and the concave part 263, is provided, the elongation rate of the plate at the corresponding position is reduced, the stamping thinning amount of the plate at the position of the connecting section 32 is also reduced accordingly, the strength loss is small, and it is beneficial to improve the strength of the plate 100. Therefore, the plate heat exchanger 10 is not easy to deform during its use.

[0060] In the direction of the pointed corner of the corresponding substructure S1, the side of the concave portion 263 close to the top 41 of the substructure S1 is more concave than the side of the concave portion 263 close to the bottom of the first groove 14, and the side of the convex portion 264 close to the bottom of the first groove 14 is more convex than the side of the convex portion 264 close to the top 41. The convex portion 264 can extend and protrude from the intersection of the first side portion 421 and the top 41 to the first groove 14, or extend and protrude from the waist position of the first side portion 421 to the first groove 14, and the concave portion 263 can extend and concave from the intersection of the second side portion 422 and the first groove 14 to the top 41, or extend and concave from the waist position of the second side portion 422 to the top 41.

[0061] refer to Fig.13 A schematic cross-sectional view of a plurality of continuous curved sections in the length direction of the plate, wherein the first fluid flows between the front surface 1001 of the first plate 101 and the back surface 1002 of the second plate 102. Fig.13 In the figure, the upper side of each plate is the side where the front side 1001 is located, and the lower side of each plate is the side where the reverse side 1002 is located. The solid line with an arrow indicates the approximate flow direction of the fluid. The slope of the second side portion 422 of the first convex structure 13 of the first plate 101 corresponding to the position of the recess 263 is smaller than that of other positions of the second side portion 422. When the first fluid flows from the first groove 14 of the first plate 101 along the second side portion 422 to the top 41, compared with the second side wall 422 without the recess 263, the recessed area formed by the recess 263 on the side of the front side 1001 of the first plate 101 is beneficial to optimizing and expanding the flow cross-section of the first fluid at the corner position of the herringbone corrugation. The second side portion 422 without the recess 263 is indicated by a dotted line. The first fluid also needs to flow from the top 41 of the second plate 102 along the first side 421 to the second groove 24 when flowing on the side of the reverse side 1002 of the second plate 102. The corresponding depression of the concave portion 263 of the second plate 102 on the side of the reverse side 1002 of the second plate 102 also plays a role in expanding the flow cross section of the first fluid. In this way, the concave portion 263 of the first plate 101 and the concave portion 263 of the second plate 102 can both play a role in expanding the flow cross section of the first fluid at the corner position of the herringbone wave, thereby facilitating the improvement of the fluidity of the first fluid in the middle part of the herringbone wave pattern. Of course, in practice, the plate can have one of the concave portion 263 of the first plate 101 and the concave portion 263 of the second plate 102. For the first plate 101, the convex portion 264 on the side of the plate front 1001 is an area that is insensitive to the fluid flow cross section, and the convex portion 264 on the reverse side of the second plate 102 is the same, which will not be repeated here.

[0062] In other embodiments of the present application, at least one plate in the first plate 101 and the second plate 102 satisfies the requirement that the number of intersection positions formed by contact with the extension section 31 of the protruding structure of another plate at each extension section 31 of the protruding structure is two, and the plate also satisfies the requirement that at least one protruding structure is provided with a connecting portion 265, the connecting portion 265 penetrates the protruding structure at the connecting section 32 of the protruding structure, the connecting portion 265 connects two adjacent grooves separated by the protruding structure, and the plate forms a flow channel 25 for fluid to pass through the protruding structure through the connecting portion 265.

[0063] Fig.14 , Fig.15 Taking the first plate 101 as an example, the connecting portion 265 passes through the first protruding structure 13 along the main flow direction of the fluid, i.e., the plate Fig.14 and Fig.15 In the diagram, the main flow direction is the length direction of the plate, the connecting portion 265 is a groove sunken from the top surface of the first protruding structure 13, and the depth of the groove relative to the top surface of the first protruding structure 13 is less than the depth of the bottom of the first groove 14 relative to the top surface of the first protruding structure 13.

[0064] Due to the existence of the connecting portion 265, at the position of the connecting section 32 of the corresponding substructure composed of two adjacent extension sections 31 and the connecting section 31, when the fluid flows from a first groove 14 to another adjacent first groove 14 on the front side 1001 of the plate 101, it is not necessary to completely turn over the first protruding structure 13 between the two adjacent first grooves 14, and can directly reach the other first groove 14 through the flow channel 25 formed by the connecting portion 265, which is equivalent to opening up a "shortcut" to the next first groove 14 at the position of the connecting section 32. The flow pressure drop of the flow channel 25 formed by the connecting portion 265 is relatively low, which is beneficial to improve the fluidity of the fluid at the sharp corner position of the herringbone waveform pattern, thereby facilitating the distribution of the fluid on the plate surface.

[0065] Furthermore, in order to prevent the fluid from flowing out of the outlet on the other side of the plate through the connecting portion 265 in a manner of partial straight line flow, as shown in FIG. Fig.15 In the enlarged view of the partial structure of the first plate shown in FIG. 1 , the connecting portions 265 are arranged in an alternating manner on the connecting sections 32 of the first protruding structure 13. Thus, the connecting sections 32 with the connecting portions 265 and the connecting sections 32 without the connecting portions 265 are arranged alternately along the main flow direction. This is conducive to the fluid flowing on the plate in a relatively tortuous flow manner, which can be referred to Figure 6 The black line with an arrow in the middle indicates the direction of fluid flow. It can effectively improve the heat transfer coefficient of the fluid, thereby helping to improve the heat transfer performance of the plate heat exchanger.

[0066] In other embodiments of the present application, Fig.16 and Fig.17 At least one of the first plate 101 and the second plate 102 satisfies that the number of intersection positions formed by contacting with the extension section 31 of the convex structure of another plate at each extension section 31 of the convex structure is two, and the first plate 101 and the second plate 102 are assembled in an asymmetric flow channel form, that is, the first convex structure 13 of the first plate 101 is provided with a first recess 131, and the extension direction of the first recess 131 is the same as the extension direction of the first convex structure 13, Fig.16 In the embodiment, the first depression 131 extends in a direction coincident with the center line of the extension direction of the first protruding structure 13. The first depression 131 is concave from the top surface of the first protruding structure 13 to the direction of the first plate portion 12. The depth of the first depression 131 is less than the depth of the first plate portion 12 relative to the top surface of the first protruding structure 13. In the length direction of the first plate 101, two alternating grooves, one large and one small, are formed by the first groove 14 and the first depression 131. Similarly, the second protruding structure 23 of the second plate 102 is provided with a second depression 132. The extension direction of the second depression 132 is the same as the extension direction of the second protruding structure 23. Fig.17 In the embodiment, the second depression 132 is concave from the top surface of the second protruding structure 23 toward the second plate portion 22, and the depth of the second depression 132 is less than the depth of the second plate portion 22 relative to the top surface of the second protruding structure 23. On the reverse side 1002 of the second plate 102, two alternating channels, one large and one small, are formed by the second groove 24 and the second depression 132. The above asymmetric channel design is conducive to improving the heat exchange effect of the fluid.

[0067] The structure of providing the concave portion 263 and / or the convex portion 264 at the connecting section 32 of the convex structure provided in some embodiments of the present application is also applicable to the plate of such asymmetric structure. And the structure of providing the connecting portion 265 at the connecting section 32 of the convex structure provided in some embodiments of the present application is also applicable to the plate of such asymmetric structure.

[0068] In the above-mentioned embodiments, the number of intersections formed by the first protrusion structure 13 contacting the extension section 31 of the second protrusion structure 23 at each extension section 31 is two, and the number of intersections formed by the second protrusion structure 23 contacting the extension section 31 of the first protrusion structure 23 at each extension section 31 is also two. Figure 7 As shown, the contact position of the first plate 101 and the second plate 102 may only appear at the extension section 31 where the first protruding structure 13 and the second protruding structure 23 are opposite, that is, there are two positions (a1, a2) on the extension section 31 that are in contact with the extension section 31 of the other plate, or Figure 6As shown, the first protruding structure 13 on the front side 1001 of the first plate 101 contacts at least part of the connecting section 32 of the second protruding structure 23 on the back side 1002 of the second plate 102 at its connecting section 32. That is, there are two positions (a1, a2) on the extension section 31 that contact the extension section 31 of another plate, and the two connecting sections 32 on both sides of the extension section 31 respectively have two positions (M1, M2) that contact the connecting section 32 of another plate. In actual products, two adjacent plates are contacted at the connecting section 32 to form a welding point, which can be beneficial to the strength of the combination of the two plates and realize the assembly of the plates with a smaller corrugation spacing. Thereby utilizing the enhanced heat exchange effect in the main heat exchange area of ​​the plate.

[0069] The above implementation modes 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 this specification should be based on technical personnel in the relevant technical field. For example, directional descriptions such as "up" and "down" are used. Although this specification has described the present application in detail with reference to the above implementation modes, ordinary technical personnel in the field should understand that technical personnel in the relevant technical field can still modify or make equivalent substitutions to the present application, and all technical solutions and improvements thereof 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 (10), comprising a plurality of stacked plate assemblies (100), wherein the plate assemblies (100) comprise a first plate (101) and a second plate (102); the front side (1001) of the first plate (101) is opposite to the back side (1002) of the second plate (102), and the back side (1002) of the first plate (101) is opposite to the front side (1001) of the second plate (102) of the adjacent plate assembly (100); the first plate (101) and the second plate (102) are both provided with a main heat exchange area (20); the first plate (101) has a first plate portion (12) and a plurality of first protrusion structures (13) located in the main heat exchange area (20); The plurality of first protruding structures (13) are spaced apart from each other and the first protruding structures (13) are protruding relative to the first plate portion (12) on the front side (1001) of the first plate (101); the second plate (102) has a second plate portion (22) and a plurality of second protruding structures (23) located in its main heat exchange region (20); the plurality of second protruding structures (23) are spaced apart from each other and the second protruding structures (23) are protruding relative to the second plate portion (22) on the back side (1002) of the second plate (102); the protruding structures have a plurality of extension sections (31) and a plurality of connecting sections (32), each connecting section (32) being respectively connected between ends of two adjacent extension sections (31) in the extension direction; in, The first protruding structure (13) contacts and crosses with the second protruding structure (23) at its extension section (31) at its extension section (31); and at least one of the first plate (101) and the second plate (102) satisfies that the number of intersections formed by the protruding structure belonging to the plate at each extension section (31) thereof contacting with the extension section (31) of the protruding structure of another plate is two.

2. The plate heat exchanger (10) according to claim 1, characterized in that: The first protruding structure (13) and the second protruding structure (23) both extend from one side edge of the corresponding plate to the other side edge; and for any protruding structure, the protruding structure intersects with the edge of the plate at the connecting section (32) or intersects with the edge of the plate at the intersection position of the extension section (31).

3. The plate heat exchanger (10) according to claim 1 or 2, characterized in that: The length direction of the plate constitutes the main flow direction of the fluid, and the first protruding structure (13) and the second protruding structure (23) both undulate up and down in the width direction (W) of the plate in a continuous undulating corrugated form; the first protruding structure (13) and the second protruding structure (23) both intersect with the edge of the plate at the connecting section (32), so that the extension section (31) closest to the edge of the plate corresponding to any one of the first protruding structure (13) and the second protruding structure (23) has a complete form.

4. The plate heat exchanger (10) according to claim 1, characterized in that: At least one of the first plate (101) and the second plate (102) satisfies the requirement that the number of intersections formed by the contact of the protruding structure belonging to the plate with the extended section (31) of the protruding structure of another plate at each extended section (31) is two, and also satisfies the requirement that the included angle between the extension directions of two adjacent extended sections (31) belonging to the plate is non-right angle.

5. The plate heat exchanger (10) according to claim 1, characterized in that: The first protruding structure (13) and the second protruding structure (23) each comprise a plurality of substructures (S1) formed by two adjacent extension segments (31) and a connecting segment (32) located therebetween; the substructure (S1) comprises a top portion (41) and two side portions (42); the two side portions (42) are respectively connected to two sides of the top portion (41); in the direction of the pointed angle formed by the extension direction of the two adjacent extension segments (31) of each substructure (S1), the side portions (42) that forms the front side of the substructure (S1) is recorded as a first side portion (421), and the side portions (42) that forms the rear side of the substructure (S1) is recorded as a second side portion (422); At least one of the first plate (101) and the second plate (102) further satisfies the following conditions: the second side portion (422) of at least one substructure (S1) belonging to the plate forms a recessed portion (263) in the direction indicated by the sharp corner in at least a partial area of ​​the connecting section (32); a recessed area corresponding to the recessed portion (263) forms a part of a fluid channel for the flow of a first fluid; and / or the first side portion (421) of at least one substructure (S1) forms a convex portion (264) protruding in the direction indicated by the sharp corner in at least a partial area of ​​the connecting section (32); the recessed area formed by the convex portion (264) on the opposite side of the plate forms a part of a fluid channel for the flow of a second fluid.

6. The plate heat exchanger (10) according to claim 5, characterized in that: Relative to the plane where the top (41) is located, the slope of the second side portion (422) at a position corresponding to the recess (263) is smaller than the slope of other positions of the second side portion (422); Relative to the plane where the top (41) is located, the slope of the first side portion (421) at a position corresponding to the convex portion (264) is smaller than the slope of other positions of the first side portion (421).

7. The plate heat exchanger (10) according to claim 1, characterized in that: At least one of the first plate (101) and the second plate (102) further satisfies the following conditions: at least one protruding structure belonging to the plate is provided with a connecting portion (265), the connecting portion (265) penetrates the protruding structure at the connecting section (32), the connecting portion (265) connects two adjacent grooves separated by the protruding structure, and the plate forms a flow channel (25) through the connecting portion (265) for fluid to pass through the protruding structure.

8. The plate heat exchanger (10) according to claim 7, characterized in that: The connecting portion (265) penetrates the protruding structure along the length direction (L) of the plate, and the connecting portion (265) is a groove sunken from the top surface of the protruding structure, and the depth of the groove relative to the top surface of the protruding structure is less than the depth of the bottom of the groove located between adjacent protruding structures relative to the top surface of the protruding structure.

9. The plate heat exchanger (10) according to claim 1, characterized in that: The first protruding structure (13) is provided with a first recess (131), the extension direction of the first recess (131) is the same as the extension direction of the first protruding structure (13), the first recess (131) is recessed from the top surface of the first protruding structure (13), and the depth of the first recess (131) is less than the depth of the first plate portion (12) relative to the top surface of the first protruding structure (13); the second protruding structure (23) is provided with a second recess (132), the extension direction of the second recess (132) is the same as the extension direction of the second protruding structure (23), the second recess (132) is recessed from the top surface of the second protruding structure (23), and the depth of the second recess (132) is less than the depth of the second plate portion (22) relative to the top surface of the second protruding structure (23).

10. The plate heat exchanger (10) according to claim 1, characterized in that For any one of the first plate (101) and the second plate (102), the ratio X between the distance (L1) between the center lines of two adjacent protruding structures in the extension direction and the depth (D) of the bottom of the groove between the two adjacent protruding structures relative to the top surface of the protruding structure is in the range of 2.5≤X≤6.

11. The plate heat exchanger (10) according to claim 1, characterized in that The first protruding structure (13) on the front side (1001) of the first plate (101) contacts at least partially the connecting section (32) of the second protruding structure (23) on the back side (1002) of the second plate (102) at its connecting section (32).

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