Plate Heat Exchanger

Abstract

The plate heat exchanger provided by the present application includes a plate assembly, the plate assembly includes a first plate and a second plate; the first plate has a first plate portion and a plurality of first protrusion structures; a first groove is formed between two adjacent first protrusion structures; the second plate has a second plate portion and a plurality of second protrusion structures; a second groove is formed between two adjacent second protrusion structures; the first protrusion structure and the second protrusion structure both have a plurality of extension sections and a plurality of connecting sections; the first protrusion structure of the first plate contacts with the second protrusion structure of the second plate at least partially in its connecting section at its connecting section, the extension section of the first protrusion structure is located above the notch of the second groove; the extension section of the second protrusion structure is located above the notch of the first groove. The present application is conducive to reducing the fluid pressure drop as much as possible while obtaining a better heat exchange effect.

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 invention of the present application aims to provide a plate heat exchanger which provides better heat exchange performance under the condition of lower fluid pressure drop.

[0006] In a first aspect, the present application provides 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 an 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 and a plurality of first protrusion structures located in its main heat exchange area, the plurality of first protrusion structures are spaced apart from each other and the first protrusion structures protrude from the first plate portion on the front side of the first plate; a first groove is formed between two adjacent first protrusion structures; the second plate has a second plate portion and a plurality of second protrusion structures located in its main heat exchange area, the plurality of second protrusion structures are spaced apart from each other and the second protrusion structures protrude from the second plate portion on the back side of the second plate; a second groove is formed between two adjacent second protrusion structures; the first protrusion structure and the second protrusion structure each have at least two extension sections and at least one connecting section, each connecting section being connected between the ends of the extension direction of two adjacent extension sections;

[0007] The first protruding structure of the first plate is in contact with the second protruding structure of the second plate at its connecting section in at least a partial area at its extending section, and the extending section of the first protruding structure is located above the notch of the second groove; the extending section of the second protruding structure is located above the notch of the first groove.

[0008] In a second aspect, the present application further provides another 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 an 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 and a plurality of first protrusion structures located in its main heat exchange area, the plurality of first protrusion structures are spaced apart from each other and the first protrusion structure protrudes from the first plate portion on the front side of the first plate; the first protrusion structure has at least two extension sections and at least one connecting section, each connecting section being connected between ends of two adjacent extension sections in the extension direction;

[0009] The second plate has a second plate portion located in its main heat exchange area, a plurality of protruding points, and a plurality of first transition structures; the protruding points protrude from the second plate portion on the reverse side of the second plate; the plurality of protruding points are spaced apart from each other; the first transition structure is a curved surface structure that is concave relative to the protruding points; the depth of the first transition structure relative to the protruding points at the lowest point on the reverse side of the second plate is less than the depth of the second plate portion relative to the protruding points; two adjacent protruding points are transitioned through the first transition structure;

[0010] Among them, the first protruding structure on the front side of the first plate is in contact with at least a portion of the protruding point on the back side of the second plate at its connecting section, and the first protruding structure on the front side of the first plate is opposite to and spaced from the first transition structure on the back side of the second plate at its extending section.

[0011] The plate heat exchanger provided by the present application has a raised structure of a plate that contacts another plate at the connecting section and is spaced from another plate at the extending section. Since the number of contact positions between the extending section and other plates is reduced, it is beneficial to shorten the size of the extending section, so that the raised structure of the plate can form more extending sections and connecting sections under the condition of limited plate width. The plate relies on the position of multiple connecting sections to help block the flow trend of the fluid in the channel along the extension direction of the extending section. The multiple deflections of the relatively large number of connecting sections to the movement of the fluid in the groove are beneficial to enable the fluid to obtain a better longitudinal flow effect along the main flow direction. This is beneficial to reducing the fluid flow pressure drop, and the relatively short extension section and the multiple deflections of the connecting section are beneficial to a good mixing effect of the gas phase working medium and the liquid phase working medium, which is beneficial 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

[0012] Figure 1 It is a structural schematic diagram of the relevant plate involved in the background technology of this application;

[0013] Figure 2It is a schematic diagram of the top view effect of the stacked plates involved in the background technology of this application;

[0014] Figure 3 It is a structural schematic diagram of a plate heat exchanger involved in an embodiment of the present application;

[0015] Figure 4 is a schematic diagram of an exploded structure of a plate assembly involved in an embodiment of the present application;

[0016] Figure 5 is an enlarged schematic diagram of the structure of a first plate involved in an embodiment of the present application;

[0017] Figure 6 is a schematic top view of a first plate and a second plate superimposed on each other according to an embodiment of the present application;

[0018] Figure 7 is an enlarged schematic diagram of the structure of another first plate involved in an embodiment of the present application;

[0019] Figure 8 is an enlarged schematic diagram of the structure of another first plate involved in an embodiment of the present application;

[0020] Fig. 9 This is a schematic structural diagram of a first protrusion structure of a first plate according to an embodiment of the present application arranged along the width direction of the plate;

[0021] Fig.10 is a top view schematic diagram of another first plate and a second plate superimposed on each other according to an embodiment of the present application;

[0022] Fig.11 is a top view schematic diagram of another first plate and a second plate superimposed on each other according to an embodiment of the present application;

[0023] Fig.12 is a partial enlarged schematic diagram of a first protrusion structure involved in an embodiment of the present application;

[0024] Fig.13 is a partial enlarged schematic diagram of a second protrusion structure involved in an embodiment of the present application;

[0025] Fig.14 This is the implementation method of the present application Fig.11 and Fig.12 Schematic diagram of the cross-sectional effect after the two protrusion structures are superimposed;

[0026] Fig.15 It is a schematic diagram of a partial exploded structure of another plate assembly involved in an embodiment of the present application;

[0027] Fig.16is an enlarged schematic diagram of the structure of another first plate involved in an embodiment of the present application;

[0028] Fig.17 It is an enlarged schematic diagram of the structure of another first plate (second plate) involved in the embodiment of the present application;

[0029] Fig.18 It is a schematic diagram of an enlarged structure of a partial area of ​​a second plate involved in an embodiment of the present application;

[0030] Fig.19 It is a top view schematic diagram of another first plate and a second plate superimposed on each other according to an embodiment of the present application. DETAILED DESCRIPTION

[0031] 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.

[0032] For a plate heat exchanger having a corrugated structure similar to a herringbone wave, the flow of the fluid 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.

[0033] Under the wave pitch parameters that meet the mold forming and structural strength requirements, the plate with an obtuse wave angle has a larger flow resistance in the main flow direction of the fluid, but the heat exchange performance is relatively good. The plate with an acute wave angle has a smaller flow resistance in the main flow direction of the fluid, but the heat exchange performance is relatively general. Therefore, the relevant technology switches the primary and secondary positions of the two by designing the key parameters such as the wave angle and wave pitch of the herringbone wave, so as to achieve the balance of the two parameters of heat exchange effect and fluid pressure drop. Under some specific technical requirements, the relevant technology will set the corrugation angle to 90° to balance the pressure drop and heat exchange performance. At present, some related technologies use plates with multiple herringbone wave structures of about 2 or 3 layers, which can be referred to Figure 1 and Figure 2 The plate structure shown.

[0034] 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.

[0035] like Figure 3 As shown, one embodiment of the present application relates to a plate heat exchanger 10, comprising a plurality of stacked plate assemblies 100.

[0036] 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.

[0037] The first plate 101 and the second plate 102 are both provided with a main heat exchange area 20. The main heat exchange area 20 may be located in the middle of the plate, and 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, and the corner hole areas are provided with through holes penetrating the plate, and fluid flows in and out through the through holes.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] The first plate 101 and the second plate 102 are formed with multiple peaks and multiple troughs in the main heat exchange area 20 by corresponding protruding structures. The multiple peaks and multiple troughs are arranged alternately in the length direction of the plate, and two adjacent troughs can have the same or different depths relative to the peaks located between them. The first protruding structures 13 are arranged at a certain distance from each other in the main heat exchange area 20 of the first plate 101, and the spacing between the multiple first protruding structures 13 can be equal or unequal. The second protruding structures 23 are arranged at a certain distance from each other in the main heat exchange area 20 of the second plate 102, and the spacing between the multiple second protruding structures 23 can be equal or unequal.

[0042] 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 52, 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 4 , Figure 5 Indication, among which, Figure 5 In the top view of the first protruding structure 13, the extension directions of two adjacent extension sections 31 intersect, and a plurality of connecting sections 32 are respectively connected between a plurality of groups of two adjacent extension sections 31, and the first protruding structure 13 and the second protruding structure 23 both form a continuous pattern. Specifically, the continuous pattern may be a multiple continuous herringbone corrugated pattern.

[0043] The first protruding structure 13 is in contact with the second protruding structure 23 at least partially at its connecting section 32. Specifically, the connecting sections 32 on both sides of the extending direction of the extending section 31 of the first protruding structure 13 are in contact with at least partially at least the connecting sections 32 of the two second protruding structures 23 adjacent to the second plate 102, and the contact position can be fixed by solder to form a welding spot M. The extending section 31 of the first protruding structure 13 is located above the notch of the second groove 24, so that the extending section 31 of the first protruding structure 13 does not form a welding spot. The connecting sections 32 on both sides of the extending direction of the extending section 31 of the second protruding structure 23 are in contact with at least partially at least the connecting sections 32 of the two first protruding structures 13 adjacent to the first plate 101, and the contact position can be fixed by solder to form a welding spot M. The extending section 31 of the second protruding structure 23 is located above the notch of the first groove 14, so that the extending section 31 of the second protruding structure 23 does not form a welding spot.

[0044] The solder joint location can be referenced Figure 6 The dotted circle frame indicates Figure 6The solid line represents the top surface of the first protruding structure 13 facing the back surface 1002 of the second plate 102 , and the dotted line represents the top surface of the second protruding structure 23 facing the front surface 1001 of the first plate 101 .

[0045] After research, the inventors found that the solution of the related technology is to set the angle between the extension directions of two adjacent extension sections to 90° to achieve a balance between the heat exchange effect and the pressure drop. The technical solution provided by the inventor does not follow the solution ideas in the relevant technology. 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 this application is that under the condition of limited plate surface width, the extension section 31 of the first protrusion structure 13 is not in contact with the extension section 31 of the second protrusion structure 23, so that there is no intersection between the extension section 31 of the first protrusion structure 13 and the extension section 31 of the second protrusion structure 23, 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.

[0046] In some embodiments of the present application, the extension section 31 has a roughly linear extension direction, and the connecting section 32 extends along a curved path, so that the center line of the first protrusion structure 13 in its extension direction and the center line of the second protrusion structure 23 in its extension direction both form a continuous bending shape. Figure 5Take the center line b1 of the extension direction of the first protrusion structure 13 as an example. The connection section 32 is extended in a curved path, which is conducive to making the flow path of the fluid relatively smooth and unobstructed, and is conducive to reducing the pressure drop of the fluid flow and improving the heat exchange effect.

[0047] Alternatively, the extension section 31 and the connection section 32 both have a substantially linear extension direction, and the center line of the first protruding structure 13 in the extension direction and the center line of the second protruding structure 23 in the extension direction form a continuous trapezoidal shape. Figure 7 Taking the center line b2 of the extension direction of the first protruding structure 13 as an example, setting the connecting section 32 in a straight path is conducive to expanding the contact area between the connecting section 32 of the first protruding structure 13 and the connecting section 32 of the second protruding structure 23, increasing the welding point area and thus improving the stability of the plate connection.

[0048] Alternatively, the extension section 31 and the connection section 32 both extend along a curved path, and the center line of the first protruding structure 13 in the extension direction and the center line of the second protruding structure 23 in the extension direction form a continuous wave shape. Figure 8 Take the center line b3 of the extension direction of the first protruding structure 13 as an example.

[0049] For the first plate 101 and the second plate 102, in some embodiments, 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.

[0050] 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, and 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. In some embodiments, the multiplicity of the multiple herringbone waves of the first convex structure 13 and the second convex structure 23 is at least 3. Each herringbone wave formed by the first convex structure 13 can be the same shape and size as other herringbone waves, or can be 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.

[0051] Among them, 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 the first protrusion structure 13 and the second protrusion 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 protrusion structure 13 and the second protrusion structure 23 has a complete shape.

[0052] In an optional embodiment of the present application, the first convex structure 13 and the second convex structure 23 both form a continuous periodic pattern along the width direction of the plate, that is, the structure and shape of each herringbone wave are the same, and the periodic pattern formed by the first convex structure 13 differs from the periodic pattern formed by the second convex structure 23 by half a period. Fig. 9 The enlarged schematic diagram of the structure of a partial area of ​​the first plate 101 shown in the figure shows that the periodic pattern formed by the first protruding structure 13 and the periodic pattern formed by the second protruding structure 23 can be the same or different, but the number of periods is the same, so that the first plate 101 and the second plate 102 can be easily assembled. The first plate 101 and the second plate 102 are plates of the same shape and structure, so that the periodic pattern formed by the first protruding structure 13 and the periodic pattern formed by the second protruding structure 23 are the same. When assembling, the first plate 101 is horizontally rotated 180° relative to the second plate 102.

[0053] like Fig. 9 In the diagram, the periodic pattern of the first protruding structure 13 and the periodic pattern of the second protruding structure 23 have the same number of periods and the number of periods is an integer of 8. Each of the 8 periods is a continuous and complete form and each period is symmetrically arranged along the length direction L of the plate. The first protruding structure 13 and the second protruding structure 23 with an integer number of periods extend from one side edge to the other side edge of the corresponding plate width direction W. 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. Fig. 9 The extension section 31 of the first protruding structure 13 closest to the edge in the width direction W of the plate is the extension section 31 of the outermost herringbone wave in the width direction of the plate, and the length of the extension section 31 in the extension direction is the total length of the corresponding complete extension section 31 in the extension direction. Figure 1 The multiple herringbone waves are distinguished by Figure 1In the embodiment, the extension section of the multiple herringbone wave closest to the edge in the width direction of the plate is shorter, much smaller than the total length of the complete extension section, and some space is left between the connecting section 32 closest to the edge in the width direction of the plate and the edge of the plate, so that when two adjacent plates are assembled, the flow channel formed by the narrow space has a greater impact on the flow of the fluid, and the related implementation method provided by the present application, the extension section closest to the edge of the first plate 101 is the length of the complete extension section, and the position close to the edge in the width direction of the first plate 101 is not easy to form a narrow flow channel, so that the position close to the edge can allow the fluid to pass through and is not easy to form a flow dead zone, which is conducive to improving the uniformity of the distribution of the fluid on the plate, and is conducive to expanding the effective heat exchange area of ​​the plate, and improving the heat exchange effect of the plate heat exchanger. In addition, setting the welding point at the intersection of the plate edge can improve the strength of the side of the plate, which is conducive to improving the product stability of the plate heat exchanger as a whole.

[0054] In one embodiment provided in the present application, reference Fig. 9 As shown, among the multiple extension segments 31, the extension directions of at least one group of two adjacent extension segments deviate at equal angles to the two sides of the width direction of the plate relative to the length direction of the plate.

[0055] In one embodiment provided in the present application, the plurality of extension segments 31 include at least two types of extension segments, the lengths of the center lines of the two types of extension segments in the extension direction are unequal, and at least some of the two adjacent extension segments are extension segments of different types.

[0056] In practical applications, the first protrusion structure 13 and the second protrusion structure 23 may be designed to be asymmetrical. Fig.10 An enlarged view of the partial structure of the assembly of the first convex structure 13 and the second convex structure 23 of the example, the solid line illustrates the structure of the first convex structure 13, and the dotted line illustrates the structure of the second convex structure 23, wherein the two adjacent extension sections of the first convex structure 13 in the dotted circular frame include a first extension section 311 and a second extension section 312. The length L1 of the center line of the extension direction of the first extension section 311 and the length L2 of the center line of the extension direction of the second extension section 312 are not equal.

[0057] like Fig.11 As shown, in an embodiment provided by the present application, 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 segments 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 segments 31 corresponding to the second protruding structure 23 of the second plate 102 is recorded as the second angle β2.

[0058] The first angle β1 and the second angle β2 are different in angle. The first angle β1 is an obtuse angle of approximately 120°, and the second angle β2 is an acute angle of approximately 70°.

[0059] Of course, the first angle β1 and the second angle β2 can also be the same. In practice, the first angle a1 and the second angle a2 can be one of an acute angle, a right angle, and an obtuse angle. Different angles can be selected in different application scenarios, that is, any two adjacent plates of the plate heat exchanger can be self-assembled at the same angle or mixedly assembled at different angles. In some embodiments, the first angle β1 and the second angle β2 are both in the range of 40° to 165°.

[0060] And when other parameters of the plate remain unchanged, when the included angle of the extension direction fitting of two adjacent extension sections of the protrusion structure is an acute angle, it is beneficial to make the protrusion structure arranged along the width direction of the plate have more extension sections and connecting sections under the condition of limited plate width, that is, the number of periodic patterns formed by the protrusion structure increases, and the multiplicity of the herringbone wave increases, which is beneficial to block the flow trend of the fluid along the groove direction through the connecting section while ensuring good heat exchange performance, thereby switching to longitudinal flow along the length direction of the plate, which is beneficial to reduce the pressure drop.

[0061] In an embodiment 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.12 , Fig.14 As 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.

[0062] Among them, on the front side 1001 of the first plate 101, the first side portion 421 forms a convex portion 43 protruding toward the direction of the sharp corner in at least a part of the connecting section 32 of the substructure S1, and the side of the convex portion 43 close to the top 41 of the substructure S1 protrudes toward the direction of the sharp corner of the substructure S1 by a greater distance than the side of the convex portion 43 close to the bottom of the first groove 14. In some embodiments, relative to the plane where the top 41 is located, the slope of the first side portion 421 at the position corresponding to the convex portion 43 is greater than the slope of other positions of the first side portion 421.

[0063] On the reverse side 1002 of the second plate 102, reference Fig.12 , Fig.14As shown in the figure, the second side portion 422 forms a recessed portion 44 in the direction of the pointed corner at least partially in the connecting section 32 of the substructure S2, and the side of the recessed portion 44 close to the bottom of the second groove 24 is recessed farther in the direction of the pointed corner of the substructure S1 than the side of the recessed portion 44 close to the top 41 of the substructure S1. In some embodiments, relative to the plane where the top 41 is located, the slope of the second side portion 422 at the position corresponding to the recessed portion 44 is greater than the slope of other positions of the second side portion 422.

[0064] The convex portion 43 of the first convex structure 13 contacts the top 41 of the second convex structure 23 to form a bonding area, and the concave surface corresponding to the concave portion 44 of the second convex structure 23 is spaced from the convex portion 43 on one side close to the top 41 of the substructure where it is located. In the figure, the concave portion 44 of the second convex structure 23 is at least partially opposite to the first plate portion 12.

[0065] When the first plate 101 and the second plate 102 are assembled, the connection section 32 of the first protruding structure 13 and the connection section 32 of the second protruding structure 23 can contact to form a welding spot. However, since there is no welding spot at the extension section 31 of the first protruding structure 13 and the extension section 32 of the second protruding structure 23, the contact area of ​​the connection section 32 of the two protruding structures can be effectively expanded by the protruding portion 43 of the first protruding structure 13 and the concave portion 44 of the second protruding structure 23, which is beneficial to improve the reliability of the connection between the first plate 101 and the second plate 102 in the protruding structure with relatively small size. At the same time, referring to Fig.12 As shown in the schematic diagram of the assembly cross section of the first plate 101 and the second plate 102 at the connection section 32, the concave portion 44 is conducive to expanding the flow cross section of the fluid on the back side 1002 of the second plate 102 at the herringbone wave connection section 32, and the convex portion 43 is conducive to expanding the flow cross section of the fluid on the back side 1002 of the first plate 101 at the herringbone wave connection section 32, which is conducive to improving the fluidity of the fluid at the herringbone wave connection section 32, thereby improving the heat exchange performance. Fig.15 , Fig.16 As shown, in one embodiment provided by the present application, the first protruding structure 13 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 protruding structure 13. Fig.15 and 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, and the first depression 131 is concave from the top surface of the first protruding structure 13 toward the first plate portion 12, and 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 channels, one large and one small, are formed by the first groove 14 and the first depression 131, and this asymmetric channel design is conducive to improving the heat exchange effect of the fluid.

[0066] Correspondingly, the second protrusion structure 23 is provided with a second recess 132, and the extension direction of the second recess 132 is the same as the extension direction of the second protrusion structure 23. In the figure, the second recess 132 extends in a direction coincident with the center line of the extension direction of the second protrusion structure 23, and the second recess 132 is recessed from the top surface of the second protrusion structure 23 toward the second plate portion 22, 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 protrusion structure 23.

[0067] like Fig.17 As shown, in one embodiment provided by the present application, the first protruding structure 13 is provided with a plurality of third recesses 133, and the plurality of third recesses 133 respectively extend along the extension directions of the plurality of extension sections 31 of the first protruding structure 13, and two adjacent third recesses 133 are spaced apart at the connecting section 32 of the first protruding structure 13, and the third recesses 133 are recessed from the top of the first protruding structure 13, and the depth of the third recesses 133 is less than the depth of the first plate portion 12 relative to the top of the first protruding structure 13.

[0068] The second protruding structure 23 is provided with a plurality of fourth recesses 134, and the plurality of fourth recesses 134 extend respectively along the extension direction of the plurality of extension sections 31 of the second protruding structure 23, and two adjacent fourth recesses 134 are spaced apart at the connecting section 32 of the second protruding structure 23, and the fourth recess 134 is recessed from the top of the second protruding structure 23, and the depth of the fourth recess 134 is less than the depth of the second plate portion 22 relative to the top of the second protruding structure 23.

[0069] In the plate heat exchanger of the present application, the connecting section of the first protruding structure is in contact with the connecting section of the second protruding structure, the extending section of the first protruding structure is located above the notch of the first groove, and the extending section of the second protruding structure is located above the notch of the second groove. In this way, by reducing the number of cross positions formed by the contact between the extending section of the first protruding structure and the extending section of the second protruding structure, it is helpful to shorten the size of the extending section, and under the condition of limited plate width, it is helpful to make the protruding structure of the plate form more extending sections and connecting sections in the width direction of the plate. In this way, the plate relies on the position of the extending section to enable the fluid to obtain a better heat exchange effect with a smaller flow resistance, and the plate relies on the position of the connecting section to block the flow trend of the fluid groove, ensure the baffle effect of the fluid movement, and help switch the fluid flow mode to a longitudinal flow. This is further helpful to reduce the fluid pressure drop as much as possible while obtaining a better heat exchange effect.

[0070] The present application also provides another embodiment of the plate heat exchanger, which is Figure 4The embodiment of the plate heat exchanger 10 is slightly different, the plate heat exchanger 10 includes a plurality of stacked plate assemblies 100, the plate assembly 100 includes 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.

[0071] 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 spaced apart from each other and protrude from the first plate portion 12 on the front surface 1001 of the first plate 101. The first protruding structure 13 has a plurality of extension segments 31 and a plurality of connecting segments 32. The plurality of connecting segments 32 are respectively connected between the ends of a plurality of adjacent two extension segments 31 in the extension direction. The first protruding structures 13 form a continuous pattern.

[0072] The difference is that the reference Fig.18 , Fig.19 As shown, the second plate 102' has a second plate portion 22' located in its main heat exchange area 20, a plurality of protruding points 51 and a plurality of first transition structures 52. The protruding points 51 protrude from the second plate portion 22' on the reverse side 1002 of the second plate 102'. The plurality of protruding points 51 are spaced apart from each other, and the first transition structure 52 is a curved surface structure that is concave relative to the protruding points 51. The depth of the first transition structure 52 at the lowest point d on the reverse side 1002 of the second plate 102' relative to the protruding points 51 is less than the depth of the second plate portion 22' relative to the protruding points 51, and the first transition structure 52 is used to transition between two adjacent protruding points 51.

[0073] in, Fig.19 In the figure, the dotted line represents the top surface of the first protruding structure 13 on the front side 1001 of the first plate 101 facing the back side 1002 of the second plate 102', and the solid line represents the back side 1002 of the second plate 102'. The first protruding structure 13 on the front side 1001 of the first plate 101 is in contact with the protruding point 51 at least partially at its connecting section 32, and the multiple extending sections 31 of the first protruding structure 13 on the front side 1001 of the first plate 101 are respectively opposite to the first transition structure 52 on the back side of the second plate 102' in at least a partial area and there is a gap.

[0074] This mixed assembly of plates is conducive to improving the application scenarios of plate heat exchangers. By setting a dense point wave structure on the second plate 102, it is conducive to improving the heat exchange performance of the fluid in the second plate 102'. Corresponding to the first plate 101, it is still conducive to shortening the size of the extension section of the first protruding structure 13 by reducing the number of cross positions formed by the contact between the extension section of the first protruding structure 13 and the second plate, and under the condition of limited plate width, it is conducive to making the first protruding structure 13 form more extension sections and connecting sections in the width direction of the plate. Thereby, it is conducive to forming a herringbone wave shape with a large number of multiples. On the one hand, the connecting section 32 of the first protruding structure 13 is in contact with the protruding point 51, which is conducive to improving the fixing strength between 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 in the channel with a smaller flow resistance for heat exchange, and the plate relies on the position of multiple connection sections 32 to block the flow trend of the fluid along the channel, ensuring the baffle effect of the fluid movement, which is conducive to switching the fluid flow mode to a longitudinal flow formed between the fluid inlet and outlet, and is conducive to reducing the overall flow pressure drop of the fluid. In this way, the more the number of herringbone waves, the easier it is for the fluid to change to a longitudinal flow mode, and for gas-liquid two-phase refrigerants, 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 working medium and the liquid phase working medium, and the corresponding evaporation process will obtain a better enhanced heat exchange effect.

[0075] 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), the plate assemblies (100) comprising 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), 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 protruding 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 located on the first plate (101) The front side (1001) protrudes from the first plate portion (12); a first groove (14) is formed between two adjacent first protruding structures (13); 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 spaced apart from each other and the second protruding structures (23) protrude from the second plate portion (22) on the back side (1002) of the second plate (102); a second groove (24) is formed between two adjacent second protruding structures (23); the first protruding structure (13) and the second protruding structure (23) each have at least two extension sections (31) and at least one connecting section (32), each connecting section (32) being connected between the ends of two adjacent extension sections (31) in the extension direction; in, The first protruding structure (13) of the first plate (101) contacts the second protruding structure (23) of the second plate (102) at its connecting section (32) in at least a partial area of ​​its connecting section (32); the extending section (31) of the first protruding structure (13) is located above the notch of the second groove (24); and the extending section (31) of the second protruding structure (23) is located above the notch of the first groove (14).

2. The plate heat exchanger (10) according to claim 1, characterized in that: For any one of the first protrusion structure (13) and the second protrusion structure (23), the extension directions of two adjacent extension sections (31) intersect; wherein the extension section (31) has a linear extension direction, and the connecting section (32) extends along a curved path; or, the extension section (31) and the connecting section (32) both have a linear extension direction; or, the extension section (31) and the connecting section (32) both extend along a curved path.

3. The plate heat exchanger (10) according to claim 1 or 2, characterized in that: The length direction (L) of the plate constitutes the main flow direction of the fluid, and the first protrusion structure (13) and the second protrusion structure (23) both undulate up and down in the width direction (W) of the plate in the form of continuous undulating corrugations; The first protruding structure (13) and the second protruding structure (23) both meet 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 shape.

4. The plate heat exchanger (10) according to claim 3, characterized in that: At least one of the first plate (101) and the second plate (102) satisfies the condition that, among the plurality of extension sections (31) of the plate, the extension directions of at least one group of two adjacent extension sections (31) deviate at equal angles from the plate length direction (L) to both sides of the plate width direction (W).

5. 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 that the plurality of extension segments (31) of the plate include at least two types of extension segments (31); the two types of extension segments (31) have unequal lengths in the extension direction, and at least one group of two adjacent extension segments (31) are extension segments of different types.

6. The plate heat exchanger (10) according to claim 3, characterized in that: The included angle of the extension direction of two adjacent extension sections (31) of the first protruding structure (13) of the first plate (101) is recorded as a first angle (β1); the included angle of the extension direction of two adjacent extension sections (31) of the second protruding structure (23) of the second plate (102) is recorded as a second angle (β2); the value range of the first angle (β1) and the second angle (β2) are both 40° to 165°.

7. 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 consisting of two adjacent extension segments (31) and a connecting segment (32) located therebetween; the substructure 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 pointed by the sharp angle formed by the extension direction of the two adjacent extension segments (31) of each substructure, the side portions (42) that forms the front side of the substructure is recorded as a first side portion (421), and the side portions (42) that forms the rear side of the substructure is recorded as a second side portion (422); Wherein, on the front side (1001) of the first plate (101), the first side portion (421) of at least one substructure forms a convex portion (43) protruding in the direction of the pointed corner in at least a partial area of ​​its connecting section (32); and the convex portion (43) protrudes toward the direction of the pointed corner of the substructure by a greater distance on a side close to the top (41) of the substructure than on a side close to the bottom of the first groove (14); and on the back side (1002) of the second plate (102), the first side portion (421) of at least one substructure forms a convex portion (43) protruding in the direction of the pointed corner of the substructure. , the second side portion (422) of at least one substructure forms a recess (44) in the direction of the pointed corner in at least a part of its connecting section (32); and the side of the recess (44) close to the bottom of the second groove (24) is recessed by a greater distance in the direction of the pointed corner of the substructure than the side of the recess (44) close to the top (41) of the substructure; and the protrusion (43) of the first protrusion structure (13) is in contact with the top (41) of the second protrusion structure (23).

8. 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); 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, the extension direction of the second recess is the same as the extension direction of the second protruding structure (23), the second recess is recessed from the top surface of the second protruding structure (23), and the depth of the second recess is less than the depth of the second plate portion (22) relative to the top surface of the second protruding structure (23).

9. The plate heat exchanger (10) according to claim 1, characterized in that: The first protruding structure (13) is provided with a plurality of third recesses (133), and two adjacent third recesses (133) are spaced apart at the connecting section (32) of the first protruding structure (13), the third recesses (133) are recessed from the top surface of the first protruding structure (13), and the depth of the third recesses (133) 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 plurality of fourth recesses (134), and two adjacent fourth recesses (134) are spaced apart at a connecting section (32) of the second protruding structure (23), the fourth recesses (134) being recessed from the top surface of the second protruding structure (23), and the depth of the fourth recesses (134) being less than the depth of the second plate portion (22) relative to the top surface of the second protruding structure (23).

10. 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 exchanger. hot zone (20); the first plate (101) has a first plate portion (12) located in its main heat exchange zone (20) and a plurality of first protruding structures (13), the plurality of first protruding structures (13) being spaced apart from each other and the first protruding structures (13) protruding from the first plate portion (12) on the front side (1001) of the first plate (101); the first protruding structure (13) has at least two extension sections (31) and at least one connecting section (32), each connecting section (32) being connected between the ends of two adjacent extension sections (31) in the extension direction; The second plate (102') comprises a second plate portion (22') located in its main heat exchange area (20), a plurality of protruding points (51) and a plurality of first transition structures (52); the protruding points (51) protrude from the second plate portion (22') on the reverse side (1002) of the second plate (102'); the plurality of protruding points (51) are spaced apart from each other; the first transition structure (52) is a curved surface structure that is concave relative to the protruding points (51); the depth of the first transition structure (52) at the lowest point (d) on the reverse side (1002) of the second plate (102') relative to the protruding points (51) is less than the depth of the second plate portion (22') relative to the protruding points (51); two adjacent protruding points (51) are transitioned through the first transition structure (52); in, The first protruding structure (13) on the front side (1001) of the first plate (101) contacts at least a portion of the protruding point (51) on the back side (1002) of the second plate (102') at its connecting section (32); an extending section (31) of the first protruding structure (13) on the front side (1001) of the first plate (101) and the first transition structure (52) on the back side (1002) of the second plate (102') are opposite to each other and there is a gap.

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