Plate Heat Exchanger

Abstract

The present application provides a plate heat exchanger, including a plate assembly, the plate assembly including a first plate and a 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 first protrusion structure and the second protrusion structure both have a plurality of extension sections and a plurality of connecting sections; each connecting section is connected between two adjacent extension sections; wherein the first protrusion structure contacts and crosses with the second protrusion structure at its extension section at its extension section; at least one of the first plate and the second plate satisfies that the number of cross positions formed by the protrusion structure belonging to the plate at each extension section thereof contacting with the extension section of the protrusion structure of another adjacent plate is one. 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 shows that the wave angle of the herringbone wave of this plate is 90° and there are 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] To solve the above problems, the present application adopts the following technical solution: 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 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 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 structure protrudes from the second plate portion on the back side of the second plate; the first protrusion structure and the second protrusion structure each have at least two extension sections and at least one connecting section, the at least one connecting section is respectively connected between the at least one group of two adjacent extension sections;

[0006] Among them, the first protruding structure is in contact with the second protruding structure at its extension section and is cross-arranged; 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 extension section thereof contacting the extension section of the protruding structure of another adjacent plate is one.

[0007] The present application constrains the number of cross positions at each extension section of the protruding structure of at least one plate of the plate assembly for contacting and fixing with the extension section of the protruding structure of another adjacent plate to be one, 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 achieving 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

[0008] Figure 1 It is a structural schematic diagram of the relevant plate involved in the background technology of this application;

[0009] Figure 2 It is a schematic diagram of the top view effect of stacked plates involved in the background technology of this application;

[0010] Figure 3 It is a structural schematic diagram of a plate heat exchanger involved in an embodiment of the present application;

[0011] Figure 4 is a schematic diagram of an exploded structure of a plate assembly involved in an embodiment of the present application;

[0012] Figure 5 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;

[0013] Figure 6 is a schematic structural diagram of another first plate according to an embodiment of the present application;

[0014] Figure 7 is an enlarged schematic diagram of the structure of another first plate involved in an embodiment of the present application;

[0015] Figure 8 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;

[0016] Fig. 9 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;

[0017] Fig.10 is an enlarged schematic diagram of a partial area of ​​a first protrusion structure involved in an embodiment of the present application;

[0018] Fig.11 is a partial enlarged schematic diagram of a second protrusion structure involved in an embodiment of the present application;

[0019] Fig.12 This is the implementation method of the present application Fig.10 and Fig.11 Schematic diagram of the cross-sectional effect after the two protrusion structures are superimposed;

[0020] Fig.13 is a cross-sectional schematic diagram of a first plate having a first recess involved in an embodiment of the present application;

[0021] Fig.14 is a cross-sectional schematic diagram of a second plate having a second recess according to an embodiment of the present application;

[0022] Fig.15 It is a schematic diagram of an enlarged structure of a partial area of ​​a first plate involved in an embodiment of the present application. DETAILED DESCRIPTION

[0023] 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.

[0024] 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 between the inlet and outlet of the plate.

[0025] 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 of the fluid along its main flow direction, but the heat exchange performance is relatively good. The plate with an acute wave angle has a smaller flow resistance of the fluid along its main flow direction, but the heat exchange performance is relatively general. Therefore, the relevant technology switches the primary and secondary positions of the two by designing key parameters such as the wave angle and wave pitch of the herringbone wave, so as to achieve a balance between 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 plate heat exchangers with multiple herringbone wave structures of about 2 or 3 layers, which can be referred to Figure 1 and Figure 2The plate structure shown. The plate heat exchanger provided in this 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 this application is described in detail below.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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 alternately arranged along 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 on 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 on 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.

[0033] 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 two adjacent extension segments 31. 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, and the extension directions of two adjacent extension segments 31 intersect. Figure 4 , Figure 5 Indication, among which, Figure 5 Taking the top view of the first protruding structure 13 as an example, the extension directions of two adjacent extension sections 31 intersect, and multiple connecting sections 32 are respectively connected between multiple 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 can be a continuous multiple herringbone corrugated pattern.

[0034] 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 one.

[0035] Taking the first plate 101 as an example, after the first plate 101 and the second plate 102 are assembled, the first protruding structure 13 on the front side 1001 of the first plate 101 contacts the second protruding structure 23 at the extension section 31 thereof and forms a cross position, and the number of the cross positions at the extension section 31 of the first protruding structure 13 is one. For the second plate 102, the number of cross positions is related to the spacing between adjacent second protruding structures 23. The number of cross positions of the second protruding structure 23 on the back side 1002 at the extension section 31 thereof can be greater than or equal to 1.

[0036] In this application Figure 5 In the embodiment, the first protruding structure 13 forms a cross position with the extension section 31 of the second protruding structure 23 at its extension section 31 by welding. Specifically, the contact position can be fixed by brazing to form a welding spot, and the number of cross positions formed by the first protruding structure 13 and the extension section 31 of the second protruding structure 23 at each extension section 31 is one, and the number of cross positions formed by the second protruding structure 23 and the extension section 31 of the first protruding structure 13 at each extension section 31 is also one. The top of the first protruding structure 13 and the top of the second protruding structure 23 have a flat surface or a slightly curved surface for welding.

[0037] The welding point position of the extension section 31 can be referred to Figure 5 The dotted circle frame is indicated by the symbol (a1, a2). Figure 5 The dashed line represents the top surface of the first protruding structure 13 facing the back surface 1002 of the second plate 102 , and the solid line represents the top surface of the second protruding structure 23 facing the front surface 1001 of the first plate 101 .

[0038] 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. The liquid working medium is affected by the liquid viscosity and easily flows in the direction of minimum pressure drop. 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 width direction of the plate. This 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 plate sheets, 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 channel 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 multiplies of the herringbone wave, the easier it is for the fluid to change to a longitudinal flow mode, 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.

[0039] like Figure 5 As shown, the welding intersection position formed at the extension section 31 of the first protruding structure 13 and the extension section 31 of the second protruding structure 23 is recorded as the first welding point a1, and the first welding point a1 is located in the middle of the extension section 31. The first welding point a1 is equidistant from the connecting sections 32 on both sides of the extension section 31 of the first protruding structure 13 in the extending direction. Figure 8 As shown, the distance between the first welding point a1 and the closer connecting section 32 of the connecting sections on both sides of the extending section 31 of the first protruding structure 13 in the extending direction is greater than or equal to 20% of the length of the extending section 31 .

[0040] The position of the welding point at the extension section 31 cannot be too close to the connection section 32. For the plate, since the connection section 32 is usually connected between two adjacent extension sections 31 in a bent or curved form, the position of the connection section 32 of the herringbone wave has a greater impact on the fluidity of the fluid, and is prone to form a flow dead zone, which affects the flow uniformity of the plate. By designing the spacing between the welding point and the closer connection section 32 to be greater than or equal to 20% of the length of the extension section 31, it is avoided to form a larger welding point near the connection section 32, or to form a continuous weld with the welding point at the connection section 32, which is beneficial to the flow effect of the fluid at the connection section 32 of the herringbone wave, and is beneficial to improving the heat exchange performance of the plate.

[0041] Similarly, the welding intersection position formed at the extension section 31 of the second protruding structure 23 and the extension section 31 of the first protruding structure 13 is recorded as the second welding point a2. Figure 5 As shown, the distance between the second welding point a2 and the connecting sections 32 on both sides of the extending section 31 of the second protruding structure 23 is equal, or as shown in FIG. Figure 8 As shown, the distance between the second welding point a2 and the closer connecting section 32 of the connecting sections on both sides of the extending section 31 of the second protruding structure 23 in the extending direction is greater than or equal to 20% of the length of the extending section 31 .

[0042] In some embodiments of the present application, Figure 8 As shown, the first protruding structure 13 of the front side 1001 of the first plate 101 contacts the connecting section 32 of the second protruding structure 23 of the reverse side 1002 of the second plate 102 at the first connecting section 32, so that the first protruding structure 13 contacts the second plate 102 at the first connecting section 32 to form a welding spot, and the dotted line frame marked M indicates the welding spot at the position of the first connecting section 32. The first protruding structure 13 does not contact the connecting section 32 of the second protruding structure 23 of the reverse side 1002 of the second plate 102 at the second connecting section 32. The second connecting section 32 of the first protruding structure 13 of the first plate 101 is at least partially opposite to the second groove 24 of the reverse side 1002 of the second plate 102, so that the first protruding structure 13 does not contact the second plate 102 at the second connecting section 32 to form a welding spot.

[0043] In other embodiments of the present application, Figure 5 As shown, 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 each connecting section 32. The dotted box labeled M indicates the welding point at the connecting section 32 position.

[0044] by Figure 5As shown in the figure, the flow areas of the four fluid domains (C1, C2, C3, and C4) are relatively similar. When the fluid flows on the plate, it starts from the fluid domain C1 and will probabilistically flow into the fluid domain C2 and the fluid domain C3. The probability of the fluid flowing in these two directions is similar, which is beneficial to the uniformity of the fluid flow and to improving the heat exchange performance of the plate.

[0045] In some embodiments of the present application, for example Figure 5 As shown. The extension section 31 has a substantially straight extension direction, and the connection 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 bend shape. Extending the connection section 32 along a curved path is conducive to making the flow path of the fluid relatively smooth and unobstructed, which is conducive to reducing the pressure drop of the fluid flow and improving the heat exchange effect.

[0046] 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 The dotted line in the figure is an example of the center line of the extension direction of the first protruding structure 13. Arranging 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.

[0047] 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.

[0048] For the first plate 101 and the second plate 102, in some embodiments, reference Figure 6 Taking the first plate 101 as an example, the length direction L of the first 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 first plate 101. The first protruding structure 13 and the second protruding structure 23 both rise and fall in the width direction W of the first plate 101 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 width direction W of the plate at a certain angle in a continuous corrugated form.

[0049] The first protruding structure 13 and the second protruding structure 23 both form continuous multiple herringbone waves along the width direction W of the plate. The multiplicity of the herringbone waves formed by the first protruding structure 13 is the same as the multiplicity of the herringbone waves formed by the second protruding structure 23. Each herringbone wave formed by the first protruding structure 13 may be the same shape and size as other herringbone waves, or may 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 by 45° relative to the length direction of the plate toward one side of the width direction of the plate, and the other extension deviates by 60° relative to the length direction of the plate toward the other side of the width direction of the plate. Accordingly, each herringbone wave formed by the second protruding structure 23 may be the same as or different from other herringbone waves, and the present application does not impose any restriction on this.

[0050] 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 plate edge at the connecting section 32 or intersect with the plate edge at the intersection position of the extension section 31.

[0051] In an optional embodiment of the present application, the first protruding structure 13 and the second protruding 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 protruding structure 13 and the periodic pattern formed by the second protruding structure 23 differ by half a period based on their assembly relationship. Figure 6 As shown, the first protruding structure 13 of the first plate 101 forms a 7-fold periodic herringbone wave along the plate width direction W. The periodic pattern formed by the first protruding structure 13 and the periodic pattern formed by the second protruding structure 23 may 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.

[0052] The multiplicity of the herringbone waves of the first protrusion structure 13 and the multiplicity of the herringbone waves of the second protrusion structure 23 are both greater than or equal to 3. A larger multiplicity of herringbone waves is beneficial for reducing the fluid flow pressure drop while ensuring the heat exchange performance.

[0053] The periodic pattern of the first protrusion structure 13 and the periodic pattern of the second protrusion structure 23 have the same number of periods and are both integers, such as Figure 6In the figure, each of the integer number of periods is a continuous and complete form and each period is symmetrically arranged along the length direction L of the plate, and the first convex structure 13 and the second convex 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, Figure 6 The extension section 31 of the edge of the first protruding structure 13 closest to the width direction W of the plate is the extension section 31 of the outermost herringbone wave in the width direction of the plate. 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 1 In 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 in the relevant 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 beneficial to improve the uniformity of the distribution of the fluid on the plate, and is beneficial to expand the effective heat exchange area of ​​the plate, and improve the heat exchange effect of the plate heat exchanger. In addition to the way of intersecting with the edge of the plate at the connecting section, the convex structure can also intersect with the edge of the plate at the intersection of the extension section 31. Both of these intersection methods with the edge of the plate set the welding point position at the outermost edge of the plate, which can improve the strength of the side of the plate, thereby helping to improve the overall product stability of the plate heat exchanger.

[0054] In one embodiment provided in the present application, reference Figure 6 As shown, among the plurality of extension segments 31, the extension directions of at least one group of two adjacent extension segments 31 deviate at equal angles to both sides of the plate width direction W relative to the plate length direction L. For example, the extension directions of two adjacent extension segments 31 deviate at approximately 45° relative to the plate length direction L relative to both sides of the plate width direction W.

[0055] In an embodiment provided in the present application, the plurality of extension segments 31 may also 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 not equal, and at least some of the two adjacent extension segments are extension segments of different types. This asymmetric herringbone wave shape in the extension direction of the protruding structure has corresponding advantages in some specific scenarios.

[0056] like Fig. 9As shown, in an embodiment provided by the present application, the dotted line indicates the structure of the first protruding structure 13, the solid 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 31, 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.

[0057] The first angle β1 and the second angle β2 are different in angle, the first angle β1 is approximately a right angle of 90°, and the second angle β2 is approximately an obtuse angle of 120°. The value range of the first angle β1 and the second angle β2 can both be 40° to 165°.

[0058] Of course, the first angle β1 and the second angle β2 may also be the same. In practice, the first angle β1 and the second angle β2 may be an acute angle, a right angle, or an obtuse angle. Different angles may be selected in different application scenarios. That is, any two adjacent plates of the plate heat exchanger may be self-assembled at the same angle or mixedly assembled at different angles.

[0059] 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. This is beneficial to blocking the flow trend of the fluid along the groove direction through the connecting section while ensuring better heat exchange performance, thereby switching to longitudinal flow along the length direction of the plate, which is beneficial to reducing the pressure drop.

[0060] 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.10 , Fig.11 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.

[0061] 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.

[0062] And / or, on the reverse side 1002 of the second plate 102, 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.

[0063] The top 41 of the substructure of the first protruding structure 13 contacts the top 41 of the substructure of the second protruding structure 23 to form a welding point M, the convex portion 43 of the first protruding structure 13 contacts the top 41 of the second protruding structure 23 to form a bonding area, and the convex portion 43 and the concave portion 44 of the second protruding structure 23 are spaced apart from each other on one side of the top 41 of the substructure where they are located.

[0064] like Fig.12 As shown, the contact area of ​​the connecting 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. 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 connecting section 32, the recessed 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 connecting 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 connecting section 32, which is conducive to improving the fluidity of the fluid at the herringbone wave connecting section 32, thereby improving the heat exchange performance.

[0065] like Fig.13 , Fig.14 , Fig.15 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.15In 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, the extension direction of the second recess 132 is the same as the extension direction of the second protrusion structure 23, the second recess 132 extends along a direction coincident with the center line of the extension direction of the second protrusion structure 23, the second recess 132 is recessed from the top surface of the second protrusion structure 23 toward the direction of 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] 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 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 ) are spaced apart from each other and the first protruding structure (13) protrudes from 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) located in its main heat exchange area (20) and a plurality of second protruding structures (23), 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); 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) 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 the requirement that the number of cross positions formed by the protruding structure belonging to the plate at each extension section (31) thereof contacting the extension section (31) of the protruding structure of another adjacent plate is one.

2. The plate heat exchanger (10) according to claim 1, characterized in that: The first protruding structure (13) is fixed to the extension section (31) of the second protruding structure (23) at the intersection of the two by welding at its extension section (31); the number of intersections formed by each extension section (31) of the first protruding structure (13) and welded to the extension section (31) of the second protruding structure (23) is one; the number of intersections formed by each extension section (31) of the second protruding structure (23) and welded to the extension section (31) of the first protruding structure (13) is also one.

3. The plate heat exchanger (10) according to claim 2, characterized in that: The welding intersection position formed at the extension section (31) of the first protruding structure (13) and the extension section (31) of the second protruding structure (23) is recorded as a first welding point (a1), and the first welding point (a1) is located in the middle of the extension section (31) so that the distance between the first welding point (a1) and the connecting sections (32) on both sides of the extension direction of the extension section (31) is equal, or the distance between the first welding point (a1) and the nearest connecting section (32) on both sides of the extension direction of the extension section (31) is greater than or equal to 20% of the length of the extension section (31); The weld intersection position formed at the extension section (31) of the second protruding structure (23) and the extension section (31) of the first protruding structure (13) is recorded as a second welding point (a2), and the second welding point (a2) is located in the middle of the extension section (31) so that the distance between the second welding point (a2) and the connecting sections (32) on both sides of the extension direction of the extension section (31) is equal, or the distance between the second welding point (a2) and the nearest connecting section (32) on both sides of the extension direction of the extension section (31) is greater than or equal to 20% of the length of the extension section (31).

4. The plate heat exchanger (10) according to any one of claims 1 to 3, 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).

5. The plate heat exchanger (10) according to claim 4, 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 of the pointed angle formed by the extension direction of the two adjacent extension segments (31) of the 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), a first groove (14) is formed between two adjacent first protruding structures (13); the first side portion (421) of at least one substructure of the first plate (101) forms a convex portion (43) protruding in the direction of the sharp corner of the substructure in at least a part of its connecting section (32); the side of the convex portion (43) close to the top (41) of the substructure protrudes toward the direction of the sharp corner of the substructure by a greater distance than the side of the convex portion (43) close to the bottom of the first groove (14); and / or, on the back side (1001) of the second plate (102), a convex portion (43) protrudes in the direction of the sharp corner of the substructure. 2), a second groove (24) is formed between two adjacent second protruding structures (23); the second side portion (422) of at least one substructure of the second plate (102) forms a recessed portion (44) in at least a portion of its connecting section (32), which is recessed in the direction of the sharp corner of the substructure, and the side of the recessed portion (44) close to the bottom of the second groove (24) is recessed in the direction of the sharp corner of the substructure by a greater distance than the side of the recessed portion (44) close to the top (41) of the substructure; and the convex portion (43) of the first protruding structure (13) is in contact with the top (41) of the second protruding structure (23).

6. 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; 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.

7. The plate heat exchanger (10) according to claim 6, characterized in that: The length direction (L) 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 the form of continuous undulating corrugations; the first protruding structure (13) and the second protruding structure (23) both extend from one side edge of the corresponding plate width direction (W) to the other side edge, and the first protruding structure (13) and the second protruding structure (23) both intersect with the edge of the plate at the connecting section (32) or intersect with the edge of the plate at the intersection position of the extension section (31).

8. The plate heat exchanger (10) according to claim 6, characterized in that: For any one of the first protruding structure (13) and the second protruding structure (23), among the plurality of extension segments (31), the extension direction of at least one group of two adjacent extension segments (31) deviates at equal angles to both sides of the plate width direction (W) relative to the plate length direction (L).

9. The plate heat exchanger (10) according to claim 1, characterized in that: The included angle of the extension direction of two adjacent extension sections (31) corresponding to 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) corresponding to 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°.

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

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