Plate heat exchanger

Abstract

The application provides a plate heat exchanger, comprising a first plate and a second plate which are adjacent; the plate heat exchanger further comprises a first hole channel; the first plate comprises a first annular wall, and the second plate comprises a second annular wall; the plate heat exchanger further comprises a first inter-plate channel; the plate heat exchanger further comprises a distribution groove and a groove wall part; the first annular wall comprises a first matching wall and a first groove wall, the first groove wall is recessed from the first matching wall, and the maximum distance between the first matching wall and the plate structure farthest from the second plate of the first plate is smaller than the maximum distance between the two plates; the second annular wall comprises a second matching wall and a second groove wall, the second groove wall is connected with the second matching wall and arranged flush with the second matching wall; the first groove wall and the second groove wall are both part of the groove wall part, and the first matching wall and the second matching wall are at least partially and sealingly connected; and the distribution groove is connected with the first hole channel and the first inter-plate channel. The application is beneficial to improving the reliability of the plate heat exchanger.

Description

BACKGROUND

[0001] The plate heat exchanger generally comprises a plurality of plates stacked together, and an inter-plate channel is formed between two adjacent plates for fluid flow. Refrigerant and coolant can flow on the front and back sides of the plates respectively to achieve wall heat exchange through the plates. With the increasing requirements for the performance of plate heat exchangers, a distribution channel can be added to the side of the plate close to the fluid inlet to improve the distribution performance of the fluid, thereby improving the heat exchange effect of the plate heat exchanger. However, the distribution channel will also have some impact on the strength of the plate and the overall strength of the plate heat exchanger.

[0002] In some technologies, a plate heat exchanger forms a small recess at a local position near the corner hole of two adjacent plates, and then the two recess structures are matched to form a distribution channel. In this way, the two plates are recessed by a small amount, so the corresponding loss of strength of the plate heat exchanger can be reduced. However, since this distribution channel relies on the matching of the recess structures of the two plates, the machining precision of the corresponding machining die of the two plates and the assembly process of the heat exchanger is required to be high. In practice, problems such as misalignment of the recess structure are prone to occur, which can easily make the distribution channel become two small channel structures, and the solder or high-viscosity refrigerant can cause the distribution channel to be blocked, thereby affecting the reliability of the plate heat exchanger. SUMMARY

[0003] The present application is advantageous in reducing the risk of blocking the distribution channel, thereby improving the reliability of the plate heat exchanger.

[0004] The present application provides a plate heat exchanger, comprising a plurality of plates stacked together, the plurality of plates comprising adjacent first and second plates; the plate heat exchanger further comprises a first hole passing through the two plates in the stacking direction of the plates; the first plate comprises a first annular wall, and the second plate comprises a second annular wall, both of which are located on the periphery of the first hole;

[0005] The plate further comprises a main heat exchange area, the main heat exchange area of the first plate is located on the side of the first annular wall away from the first hole; the main heat exchange area of the second plate is located on the side of the second annular wall away from the first hole; the plate heat exchanger further comprises a first inter-plate channel, at least part of the first inter-plate channel is located between the main heat exchange area of the first plate and the main heat exchange area of the second plate;

[0006] The plate heat exchanger further has a distribution channel and a channel wall part forming the distribution channel; the first annular wall comprises a first fitting wall and a first channel wall connected to the first fitting wall, the first channel wall is recessed from the first fitting wall to a direction away from the second plate piece, and in the stacking direction, the first fitting wall is spaced apart from the plate structure farthest from the second plate piece of the first plate piece and from the plate structure farthest from the first plate piece of the second plate piece; the second annular wall comprises a second fitting wall and a second channel wall connected to each other, the wall surface of the second channel wall facing the first channel wall is arranged flush with the wall surface of the second fitting wall facing the first fitting wall.

[0007] The first channel wall and the second channel wall are part of the channel wall part, and the first fitting wall and the second fitting wall are at least partially sealed and connected; the distribution channel is connected to the first hole channel and the first inter-plate passage.

[0008] In the present application, the first channel wall is recessed from the first fitting wall, the wall surface of the second channel wall facing the first channel wall is arranged flush with the wall surface of the second fitting wall facing the first fitting wall, and the first fitting wall and the second fitting part are at least partially sealed and connected, so that the flow cross section of the distribution channel is mainly affected by the recessed range of the first channel wall, thereby forming the partial channel wall structure of the distribution channel, which is not easy to change the flow cross section form of the distribution channel due to misalignment, and the distribution channel is not easy to be blocked, thereby facilitating to improve the reliability of the plate heat exchanger. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 It is a structural schematic diagram of the plate heat exchanger in an embodiment of the present application;

[0010] Figure 2 It is Figure 1 It is an exploded structural schematic diagram of the plate heat exchanger;

[0011] Figure 3 It is Figure 1 It is a sectional structural schematic diagram of the plate heat exchanger;

[0012] Figure 4 It is an exploded structural schematic diagram of part of the plate piece in an embodiment of the present application;

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

[0014] Figure 6 It is a structural schematic diagram of the second plate piece in an embodiment of the present application;

[0015] Figure 7 It is Figure 5An enlarged schematic view of a first plate portion structure shown in the application;

[0016] Figure 8 An assembled structure schematic view of two plates at a distribution channel in an embodiment of the application;

[0017] Figure 9 A cut structure schematic view of an assembled plate at a corner hole in the application;

[0018] Figure 10 An assembled structure schematic view of two plates at a distribution channel in the application; Figure 9 An assembled structure schematic view of two plates at a distribution channel in the application;

[0019] Figure 11 A cut structure schematic view of an assembled plate at a corner hole in another embodiment of the application;

[0020] Figure 12 An assembled structure schematic view of two plates at a distribution channel in the application; Figure 11 An assembled structure schematic view of two plates at a distribution channel in the application; DETAILED DESCRIPTION

[0021] In order to make the technical solution of the application better understood by those skilled in the art, the application will be further described in detail below with reference to the drawings and specific embodiments.

[0022] Referring to Figures 1 to 12 The application provides a plate heat exchanger 100, which includes a plurality of external pipes 10, a first side plate 20, a heat exchange core 30 composed of a plurality of plates, and a second side plate 40. The first side plate 20 and the second side plate 40 are respectively arranged on different sides in the thickness direction of the heat exchange core 30, and the plurality of plates of the heat exchange core 30 are fixed together in a stacked manner.

[0023] Referring to Figure 1 , the plate heat exchanger 100 has a length direction L, a width direction W, and a height direction H, and the stacking direction P of the plurality of plates is the same as the height direction H of the plate heat exchanger 100. Two sides of each plate usually flow different types of heat exchange medium, one of which is refrigerant and the other is coolant. The plate heat exchanger 100 has a plurality of holes and a plurality of inter-plate channels. The holes usually extend along the stacking direction P of the plates, and the inter-plate channels are usually located between adjacent two plates and are formed by the gap between the two plates. In the plate heat exchanger 100, the holes and the inter-plate channels are part of the refrigerant flow channel 50 or the coolant flow channel 60. However, the refrigerant flow channel 50 and the coolant flow channel 60 are not connected, so that the two types of heat exchange medium can realize wall heat exchange through the spaced plate structure.

[0024] In this embodiment of the application, the heat exchange core 30 comprises multiple plates, including at least one set of adjacent first plates 11 and second plates 12. In some embodiments, the number of first plates 11 and second plates 12 can both be multiple. Figure 4 In this design, the side of the plate facing outwards, i.e., the visible side, is defined as the first heat exchange surface 1, and the side facing inwards, i.e., the invisible side, is defined as the second heat exchange surface 2. Each plate has a main heat exchange zone 70 and a plurality of corner holes located around the main heat exchange zone 70. The corner holes of multiple plates are arranged along the plate stacking direction to form at least a portion of a plurality of channels.

[0025] For multiple plates, they can be formed using a single mold, meaning each plate is identical in shape and structure. When assembling multiple plates, the plate adjacent to one plate can be rotated 180 degrees before assembly. Alternatively, multiple plates can be formed using two or more molds, allowing for different shapes or structures. For example, one plate might have a flat main heat exchange zone 70, while another plate might have a dotted wave-shaped protrusion structure in its main heat exchange zone 70. These two types of plates can also be assembled together and stacked alternately, as long as the plates meet the plate structure and assembly correspondence described in this application. In some embodiments, finned plates can be added between adjacent plates to increase the fluid heat exchange area and improve heat exchange performance.

[0026] Multiple plates along Figure 4 The heat exchange core 30 is formed by stacking plates in the P direction. The first heat exchange surface 1 of the first plate 11 is opposite to the second heat exchange surface 2 of the second plate 12. When there are multiple first plates 11 and multiple second plates 12, the second heat exchange surface 2 of the first plate 11 can be opposite to the first heat exchange surface 1 of another second plate 12. Each plate also includes a flange 71. When multiple plates are assembled, the flanges 71 of the multiple plates can be sealed by welding, such as brazing, which helps to keep the fluid in the flow channel formed between the plates. Each plate is usually provided with several corner holes. The corner holes at corresponding positions of multiple plates are coaxially or eccentrically arranged in the height direction H of the plate heat exchanger 100 to form at least a portion of the channel. In the embodiment of this application, each plate is illustrated with four corner holes, which are distributed at the four corner positions of the plate. The first plate 11 is provided with a first corner hole 41, a third corner hole 43, a fifth corner hole 45 and a sixth corner hole 46, and the second plate 12 is provided with a second corner hole 42, a fourth corner hole 44, a seventh corner hole 47 and an eighth corner hole 48.

[0027] For the first plate 11, the first corner hole 41 can serve as a fluid inlet for the refrigerant to enter the first heat exchange surface 1 of the first plate 11, and the fifth corner hole 45 can serve as a fluid outlet for the refrigerant to exit the first heat exchange surface 1 of the first plate 11. The third corner hole 43 serves as a fluid inlet for the secondary coolant to enter the second heat exchange surface 2 of the first plate 11, and the sixth corner hole 46 serves as a fluid outlet for the secondary coolant to exit the second heat exchange surface 2 of the first plate 11. Correspondingly, for the second plate 12, the second corner hole 42 and the seventh corner hole 47 can serve as a fluid inlet and outlet, respectively, for the refrigerant to enter and exit the second heat exchange surface 2 of the second plate 12, and the fourth corner hole 44 and the eighth corner hole 48 can serve as a fluid inlet and outlet, respectively, for the secondary coolant to enter and exit the first heat exchange surface 1 of the second plate 12. In the first plate 11, the first corner hole 41 and the fifth corner hole 45 are arranged along the long side of the first plate 11. Correspondingly, the second corner hole 42 and the seventh corner hole 47 of the second plate 12 are arranged along the length direction of the second plate 12. This arrangement of the corner holes can be referred to as single-side flow. Of course, in other embodiments, the first corner hole 41 and the fifth corner hole 45 of the first plate 11, and the second corner hole 42 and the seventh corner hole 47 of the second plate 12 can be arranged diagonally. This arrangement of the corner holes can be referred to as diagonal flow.

[0028] With reference to Figure 2 Figure 3 and Figure 4 , the plate heat exchanger 100 has a first channel 21 extending along the stacking direction P of the plates. The first corner hole 41 and the second corner hole 42 are both part of the first channel 21. The first plate 11 comprises a first peripheral wall 31, and the second plate 12 comprises a second peripheral wall 32. Both the first peripheral wall 31 and the second peripheral wall 32 are located at the periphery of the first channel 21. The first peripheral wall 31 and the second peripheral wall 32 cooperate to form a distribution channel 52. The first channel 21 can serve as an inlet channel for the refrigerant. The main heat exchange area 70 of the first plate 11 is located on the side of the first peripheral wall 31 that is away from the first channel 21. The main heat exchange area 70 of the second plate 12 is located on the side of the second peripheral wall 32 that is away from the first channel 21. The plate heat exchanger 100 further has a first inter-plate channel 51. At least part of the first inter-plate channel 51 is located between the second heat exchange surface 2 of the second plate 12 and the first heat exchange surface 1 of the first plate 11, and at least part of the first inter-plate channel 51 is located between the main heat exchange areas 70 of the first plate 11 and the second plate 12.

[0029] The refrigerant enters the first channel 21 through the external connection pipe 10, and then enters the first inter-plate channel 51 through the distribution channel 52. After heat exchange, the refrigerant flows out of the plate heat exchanger through the channel on the other side. Figure 4 The approximate flow path of the refrigerant is schematically shown by the dashed line. The refrigerant flows from the first corner hole 41 of the first plate 11 into the first inter-plate channel 51 through the distribution channel 52, and flows out of the first plate 11 from the fifth corner hole 45 of the first plate 11 after heat exchange.​

[0030] Reference is made to Figures 5 to 10 the first corner hole 41 and the third corner hole 43 are arranged along the width direction of the first plate 11, and correspondingly, the second corner hole 42 and the fourth corner hole 44 are arranged along the width direction of the second plate 12. The first corner hole 41 has a smaller diameter than the third corner hole 43, and the first corner hole 41 and the second corner hole 42 have the same diameter. The relatively smaller first corner hole 41 is beneficial to improve the pressure drop of the refrigerant, and in turn improve the distribution effect of the refrigerant and other gas-liquid two-phase fluid. The plate heat exchanger 100 further comprises a second hole channel 22, and the third corner hole 43 and the fourth corner hole 44 are part of the second hole channel 22. The second hole channel 22 penetrates the first plate 11 in the stacking direction to form the third corner hole 43 at the first plate 11, and the second hole channel 22 penetrates the second plate 12 in the stacking direction to form the fourth corner hole 44 at the second plate 12. The first corner hole and the third corner hole 43 are arranged along the width direction of the first plate 11, and the second corner hole and the fourth corner hole 44 are arranged along the width direction of the second plate 12. The plate structure around the third corner hole 43 is welded and sealed with the plate structure around the fourth corner hole 44, so that the third corner hole 43 and the fourth corner hole 44 are both separated from the first inter-plate channel 51.

[0031] Further, the plate heat exchanger 100 can further comprise a third hole channel 23 and a fourth hole channel 24. The first hole channel 21 communicates with the third hole channel 23, and the second hole channel 22 and the fourth hole channel 24 communicate with each other.

[0032] Reference is made to Figure 5 the first heat exchange surface 1 side of the first plate 11 as shown in Figure 6 the second heat exchange surface 2 side of the second plate 12 as shown in Figures 8 to 10For the first plate 11, the first annular wall 31 comprises a first matching wall 311 and a first groove wall 312 connected with the first matching wall 311, the first groove wall 312 is recessed from the first matching wall 311 in a direction away from the second plate 12, and in the plate stacking direction, the first matching wall 311 is spaced apart from the plate structure farthest away from the second plate 12 of the first plate 11, and the first matching wall 311 is spaced apart from the plate structure farthest away from the first plate 11 of the second plate 12. The maximum distance between the first plate 11 and the second plate 12 can be calculated in the same direction by the distance between the top end of the protruding structure of one plate and the bottom end of the recessed structure of the other plate. The first matching wall 311 is spaced apart from the plate structure farthest away from each other of the two plates, which is beneficial to improve the strength of the first annular wall 31. In practice, the first annular wall 31 is located at the periphery of the first hole 21, and the first groove wall 312 is recessed relative to the first matching wall 311, that is, the first annular wall 31 needs to be provided with an angle hole and recessed, which has a higher requirement for the strength of the first annular wall 31, otherwise the first plate 11 is easy to deform under the action of high-pressure fluid, etc. such as the first plate is easy to leak when sealing with another plate. In order to improve the strength of the first annular wall 31, by reducing the protruding height of the first matching wall 311, the material stretching degree of the first annular wall 31 and its vicinity can be reduced during the stamping process of the first plate, and the thickness of the first matching wall 311 can be relatively increased, so that the overall strength of the plate is improved, which is beneficial to the overall strength and stability of the plate heat exchanger 100. Correspondingly, the second annular wall 32 comprises a second matching wall 321 and a second groove wall 322, the wall surface of the second groove wall 322 facing the first groove wall 312 is connected with the wall surface of the second matching wall 321 facing the first matching wall 311 and is flushly arranged. That is, the second groove wall 322 and the second matching wall 321 are integrally and flushly extended structures. Further, the first groove wall 312 and the second groove wall 322 are part of the groove wall part 520 of the distribution channel 52 formed by the plate heat exchanger, and the first matching wall 311 and the second matching wall 321 are at least partially sealed and connected, and the distribution channel 52 communicates the first hole 21 and the first inter-plate passage 51. The first groove wall 312 and the second groove wall 322 are matched when they are a recessed structure of one plate and a planar structure of another plate, and the flow cross section of the distribution channel 52 is mainly affected by the recessed range of the first groove wall 312. Even if the processing precision and assembly precision of the two plates are slightly poor, the first groove wall 312 and the second groove wall 322 are not easy to cause the change of the fluid cross section form of the distribution channel 52 due to misalignment. Therefore, the distribution channel 52 is not easy to be blocked, and correspondingly, the reliability of the plate heat exchanger is higher.

[0033] Reference Figure 9 and Figure 10The first annular wall 31 further comprises a first side wall 313 extending from the first fitting wall 311 towards the first hole 21 and away from the second plate 12, and a first connecting flange 314 extending from an end of the first side wall 313 away from the first fitting wall 311 in a direction perpendicular to the stacking direction P. The second annular wall 32 further comprises a second side wall 323 extending from the second fitting wall 321 towards the first hole 21 and away from the first plate 11, and a second connecting flange 324 extending from an end of the second side wall 323 away from the second fitting wall 321 in a direction perpendicular to the stacking direction P.

[0034] The first connecting flange 314 is sealingly welded to one of the plates (e.g. the other second plate) on the side away from the second plate 12, and the second connecting flange 324 is sealingly welded to one of the plates (e.g. the other first plate) on the side away from the first plate 11. In a direction perpendicular to the stacking direction P, the first connecting flange 314 has a first connecting edge 315 connected to the first side wall 313 and a first end edge 316 away from the first side wall 313, and the maximum distance between the first connecting edge 315 and the first end edge 316 is L1, and 2mm≤L1≤10mm. In a direction perpendicular to the stacking direction P, the second connecting flange 324 has a second connecting edge 325 connected to the second side wall 323 and a second end edge 326 away from the second side wall 323, and the maximum distance between the second connecting edge 325 and the second end edge 326 is L2, and 2mm≤L2≤10mm. Further, the maximum distance between the first fitting wall 311 and the first connecting flange 314 is equal to the maximum distance between the second fitting wall and the second connecting flange 324. Since the first and second connecting flanges are to be welded to the corresponding plates to achieve sealing, the size of the welding area is an important parameter affecting the sealing. Taking the first connecting flange 314 as an example, if the maximum distance between the first connecting edge 315 and the first end edge 316 is too small, the welding quality may be affected and leakage may occur, and if it is too large, more heat exchange area will be lost for the refrigerant, in addition, the relatively large space is also prone to cause separation of the gas-liquid two-phase refrigerant and cause deterioration of the distribution effect and heat exchange performance.

[0035] In some embodiments, the depth of the groove bottom of the first groove wall 312 relative to the first fitting wall 311 is greater than half of the maximum distance between the first fitting wall 311 and the first connecting flange 314. The advantage of such an arrangement is that, for a refrigerant with a larger viscosity or a higher flow rate, the depth of the groove bottom of the first groove wall 312 relative to the first fitting wall 311 can effectively increase the size of the distribution groove 52, thereby avoiding blockage of the distribution groove 52. In the embodiments of the present application, the groove bottom of the first groove wall 312 is flush with the first connecting flange 314. A portion of the first connecting flange 314 is connected to the first groove wall 312, and another portion of the first connecting flange 314 is connected to the first side wall 313. That is, in the direction of the stacking of the plate pieces, the depth of the distribution groove 52 is the deepest at this time. Of course, in other embodiments, the groove bottom of the first groove wall 312 can also be closer to the first fitting wall 311 than the first connecting flange 314, and the flow cross section of the distribution groove 52 can be adjusted by adjusting the wall structure adjacent to the groove bottom.

[0036] Reference Figure 8 As shown, since the plate heat exchanger 100 of the present application can be applied in the scenario of a refrigerant with a larger viscosity or a higher flow rate, the size of the flow cross section of the distribution groove 52 is a key factor affecting the distribution effect. In the direction away from the central axis of the first hole 21, the cross section with the smallest area among the cross sections of the distribution groove 52 is denoted as the first cross section M. In the plane of the first cross section M, the largest circle that can be accommodated in the distribution groove 52 is defined as a reference circle O, the area of the reference circle O is S, and 0.8 mm 2 ≤ S ≤ 7.1 mm 2 If the reference circle corresponding to the smallest cross section among the cross sections of the distribution groove 52 at several positions satisfies the above condition, it means that the size of the distribution groove 52 is on the one hand such that the refrigerant with a larger viscosity or a higher flow rate is not easy to block, and on the other hand it is not too large to affect the distribution effect of the refrigerant.

[0037] Among the two opposite outer edges of the plate heat exchanger 100 in the length direction, the outer edge adjacent to the distribution groove 52 is denoted as the first side edge. The distribution groove 52 is closer to the first side edge than to the axis of the first hole 21, and the distribution groove 52 is closer to the second hole 22 than to the axis of the first hole 21. The distribution groove 52 extends in the radial direction away from the axis of the first hole 21, that is, the distribution groove 52 is arranged in a basically diagonal direction. Specifically, in the plane perpendicular to the stacking direction of the plate pieces, the extension direction of the distribution groove 52 is denoted as the first direction N1, and the width direction of the plate piece is denoted as the second direction N2. The angle β of the first direction N1 relative to the second direction N2 to the side close to the first side edge is 20°-70°. For example, in some embodiments of the present application, the angle β can be 30°.

[0038] For the refrigerant flowing in the first inter-plate channel 51, most of the refrigerant will directly flow into the main heat exchange area 70 of the plate middle part after leaving the inlet corner hole. In order not to waste the heat exchange space around the corner hole of the plate, taking the first heat exchange surface 1 of the first plate 11 as an example, after the refrigerant flows out of the distribution channel 52, the refrigerant can be guided to bypass the narrow turning area between the fourth corner hole 44 and the plate edge. In order to achieve this effect, by controlling the angle between the first direction N1 and the second direction N2 to be between 20° and 70°, the refrigerant can flow through this narrow turning area with relatively low flow pressure drop, thereby expanding the heat exchange area of the plate involved in heat exchange and improving the heat exchange effect of the plate heat exchanger 100.

[0039] In some embodiments of the present application, for the first plate 11, the first annular wall 31 and the plate structure in the main heat exchange area 70 of the first plate 11 are integrally formed by at least stamping from the same metal blank. For the second plate 12, the second annular wall 32 and the plate structure in the main heat exchange area 70 of the second plate 12 are also integrally formed by at least stamping from the same metal blank. In practice, the processing of the plate usually includes the steps of pre-stamping and then punching. Of course, some plates are directly formed by stamping from the metal blank with the corner hole. The integrally processed plate structure of the first plate 11 and the second plate 12 can reduce the number of parts, and the complete plate formed by stamping the blank plate can have the related structure of the distribution channel 52, which can simplify the assembly and reduce the positioning difficulty of the independent distributor.

[0040] Of course, in other embodiments of the present application, the plate heat exchanger 100 can include an independent distributor. Specifically, the first plate 11 includes a first plate body and a distributor welded and fixed together with the first plate body. The distributor can be formed by at least stamping the plate. In the plane perpendicular to the stacking direction of the plate, the area enclosed by the projection outer contour of the distributor is smaller than the area enclosed by the projection outer contour of the first plate body. For the independent distributor, the distributor includes the first annular wall 31 in the foregoing embodiments, and correspondingly, the main heat exchange area 70 of the first plate 11 is arranged in the first plate body. The independent distributor can be easily replaced, and the cost of the plate processing mold is reduced.

[0041] In some embodiments of the present application, the plate material of the plate heat exchanger 100 is substantially stainless steel. For a plate heat exchanger 100 of a common type of stainless steel in the art, the plate of stainless steel material has an overall elongated shape, and the ratio X of the width direction dimension to the length direction dimension of the plate satisfies 0.2≤X≤0.5. Compared with an aluminum material plate heat exchanger, the width-to-length ratio is smaller, the hole diameter of the corner hole is larger, and the proportion of the hole diameter of the corner hole in the width direction of the plate is usually close to 1 / 3 or even larger. Therefore, for a stainless steel plate heat exchanger, the gas-liquid two-phase fluid is more likely to separate and distribute unevenly at the relatively large corner hole. Therefore, the distribution channel is needed to improve the distribution effect of the refrigerant and improve the heat exchange performance of the stainless steel type plate heat exchanger.

[0042] Further, the flow cross section of the refrigerant at the distribution channel 52 is smaller than the flow cross section of the refrigerant at the first corner hole 41, which can ensure a certain range of pressure drop of the refrigerant, so that the uniformity of the refrigerant distribution is improved.

[0043] The copper foil can be used as a connecting solder between the plates of the plate heat exchanger 100. The copper foil will melt during welding to seal and fix the parts. Of course, the copper foil can not be used as a connecting solder between the plates of the plate heat exchanger 100. In this case, the plate can be set in a bimetallic structure, i.e., the plate is combined with stainless steel and copper, and the copper as a solder function is arranged on the surface of the stainless steel. In this way, during high-temperature welding, the copper will melt and play a role in welding the stainless steel materials of different plates together. This bimetallic plate processing method can use, for example, centrifugal casting to combine solid stainless steel and liquid copper metal under centrifugal conditions. Through metallurgy, centrifugal casting, and heat treatment processes, the stainless steel material and the copper material are combined into a whole through a gradually changing transition layer at the combined position, which can greatly improve the wear resistance and connection strength.

[0044] In other embodiments of the present application, referring to the corresponding another plate matching mode in Figure 11 and Figure 12 In Figure 11 , the upper plate is the first plate 11 and the lower plate is the second plate 12, and the flanges 71 of the first plate 11 and the second plate 12 are arranged from top to bottom. In this case, the first groove wall 312 can be arranged on the upper plate. That is, the recessed first groove wall 312 of the upper first plate 11 is matched with the flat second groove wall 322 of the lower second plate 12 to form the distribution channel 52.

[0045] In some embodiments of the present application, the first plate 11 is further provided with a plurality of chevron-shaped protrusions in the main heat exchange area 70 of the first plate 11, and the adjacent chevron-shaped protrusions 103 can be arranged in an interval manner. Correspondingly, the second plate 12 is also provided with a plurality of chevron-shaped protrusions 103 in the main heat exchange area 70 of the second plate 12. In this way, the chevron-shaped protrusions 103 of the two plates form a complex flow channel structure. When the fluid flows in the main heat exchange area 70 of the plate, the flow pattern of the fluid not only exists in the form of flowing along the groove of the adjacent chevron-shaped channel, but also exists in the form of flowing across the upper and lower directions of the chevron-shaped channel. Therefore, the heat exchanger can obtain better heat exchange performance. Of course, the plate can also be provided with some point-shaped protrusions in the main heat exchange area 70 of the plate. The chevron-shaped and point-shaped heat exchange protrusions are common means for strengthening the heat exchange of the plate. The present application will not be described in more detail.

[0046] The plate heat exchanger provided by the present application is described in detail above. The principles and embodiments of the present application are described by applying specific examples in this paper. The above description of the embodiments is only used to help understand the core idea of the present application. It should be pointed out that for ordinary skilled persons in the technical field, some improvements and modifications can be made to the present application without departing from the principles of the present application. These improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A plate heat exchanger, characterized in that, The plate heat exchanger includes multiple plates stacked together, the multiple plates including an adjacent first plate (11) and a second plate (12); the plate heat exchanger also has a first channel (21) penetrating the two plates along the plate stacking direction; the first plate (11) includes a first circumferential wall (31), and the second plate (12) includes a second circumferential wall (32), both of which are located around the first channel (21); The plate also has a main heat exchange zone (70), the main heat exchange zone (70) of the first plate (11) is located on the side of the first circumferential wall (31) away from the first channel (21); the main heat exchange zone (70) of the second plate (12) is located on the side of the second circumferential wall (32) away from the first channel (21); the plate heat exchanger also has a first inter-plate channel (51), at least a portion of the first inter-plate channel (51) is located between the main heat exchange zone (70) of the first plate (11) and the main heat exchange zone (70) of the second plate (12); The plate heat exchanger also has a distribution channel (52), and the plate heat exchanger also has a channel wall portion (520) forming the distribution channel (52); the first circumferential wall (31) includes a first mating wall (311) and a first channel wall (312) connected to the first mating wall (311), the first channel wall (312) being recessed from the first mating wall (311) in a direction away from the second plate (12); in the stacking direction, the first mating wall (311) and the first plate (12) are connected in a direction away from the second plate (12). 1) There is a gap between the plate structures furthest away from the second plate (12) and between the first mating wall (311) and the plate structure furthest away from the first plate (11) of the second plate (12); the second circumferential wall (32) includes a second mating wall (321) and a second groove wall (322) connected to each other, and the wall surface of the second groove wall (322) facing the first groove wall (312) and the wall surface of the second mating wall (321) facing the first mating wall (311) are flush; The first groove wall (312) and the second groove wall (322) are both part of the groove wall portion (520), and the first mating wall (311) and the second mating wall (321) are at least partially sealed together; the distribution channel (52) connects the first channel (21) and the first inter-plate channel (51). On a plane perpendicular to the stacking direction, the extension direction of the distribution channel (52) is designated as the first direction, the width direction of the plate is designated as the second direction, and the outer edge of the two opposite outer edges of the plate heat exchanger along the length direction adjacent to the first channel (21) is designated as the first side edge. The first direction is inclined to the side closer to the first side edge relative to the second direction.

2. The plate heat exchanger according to claim 1, characterized in that, The first circumferential wall (31) further includes a first sidewall (313) and a first connecting flange (314). The first sidewall (313) extends from the side of the first mating wall (311) near the first channel (21) in a direction away from the second plate (12). The first connecting flange (314) extends from the end of the first sidewall (313) away from the first mating wall (311) in a direction perpendicular to the stacking direction. The second circumferential wall (32) further includes a second sidewall (323) and a second connecting flange (324), the second sidewall (323) extending from the side of the second mating wall (321) near the first channel (21) in a direction away from the first plate (11), and the second connecting flange (324) extending from the end of the second sidewall (323) away from the second mating wall (321) in a direction perpendicular to the stacking direction; The first connecting flange (314) is sealed and welded to a plate on the side of the first plate (11) away from the second plate (12), and the second connecting flange (324) is sealed and welded to a plate on the side of the second plate (12) away from the first plate (11).

3. The plate heat exchanger according to claim 2, characterized in that, In the direction perpendicular to the stacking direction, the first connecting flange (314) has a first connecting edge (315) connected to the first sidewall (313) and a first end edge (316) away from the first sidewall (313), the maximum distance between the first connecting edge (315) and the first end edge (316) is L1, and 2mm≤L1≤10mm; In the direction perpendicular to the stacking direction, the second connecting flange (324) has a second connecting edge (325) connected to the second sidewall (323) and a second end edge (326) away from the second sidewall (323), the maximum distance between the second connecting edge (325) and the second end edge (326) is L2, and 2mm≤L2≤10mm; The maximum distance between the first mating wall (311) and the first connecting flange (314) is equal to the maximum distance between the second mating wall (321) and the second connecting flange (324).

4. The plate heat exchanger according to claim 3, characterized in that, The depth of the groove bottom of the first groove wall (312) recessed relative to the first mating wall (311) is greater than half of the maximum distance between the first mating wall (311) and the first connecting flange (314).

5. The plate heat exchanger according to claim 4, characterized in that, The bottom of the first groove wall (312) is flush with the first connecting flange (314); a part of the first connecting flange (314) is connected to the first groove wall (312), and another part of the first connecting flange (314) is connected to the first side wall (313).

6. The plate heat exchanger according to claim 1, characterized in that, The plate has a length direction and a width direction, and the ratio of the width direction dimension to the length direction dimension of the plate is X, and 0.2≤X≤0.5; Along the central axis away from the first channel (21), the cross-section with the smallest area among several cross-sections of the distribution channel (52) is designated as the first cross-section; on the plane containing the first cross-section, the largest circle that can be accommodated within the distribution channel (52) is defined as the reference circle, the area of ​​which is S and 0.8 mm. 2 ≤S≤7.1 mm 2 .

7. The plate heat exchanger according to claim 2, characterized in that, The first channel (21) penetrates the first connecting flange (314) to form a first corner hole (41) at the first plate (11), and the first channel (21) penetrates the second connecting flange (324) to form a second corner hole (42) at the second plate (12); the first corner hole (41) and the second corner hole (42) have the same shape and size; The plate heat exchanger further includes a second channel (22) that penetrates the first plate (11) in the stacking direction to form a third corner hole (43) at the first plate (11) and a fourth corner hole (44) that penetrates the second plate (12) in the stacking direction. The first corner hole (41) and the third corner hole (43) are arranged along the width direction of the first plate (11), and the second corner hole (42) and the fourth corner hole (44) are arranged along the width direction of the second plate (12); the plate structure around the third corner hole (43) and the plate structure around the fourth corner hole (44) are welded and sealed, so that the third corner hole (43) and the fourth corner hole (44) are both separated from the first plate channel (51).

8. The plate heat exchanger according to claim 7, characterized in that, The distribution channel (52) is closer to the second channel (22) than the axis of the first channel (21); the distribution channel (52) extends in a radial direction away from the axis of the first channel (21), and the first direction is inclined at an angle β relative to the second direction toward the side closer to the first side edge, and 20°≤β≤70°.

9. The plate heat exchanger according to claim 1, characterized in that, In the first plate (11), the first circumferential wall (31) and the plate structure of the main heat exchange zone (70) located in the first plate (11) are formed by the same metal blank at least by stamping; in the second plate (12), the second circumferential wall (32) and the plate structure of the main heat exchange zone (70) located in the second plate (12) are also formed by the same metal blank at least by stamping.

10. The plate heat exchanger according to claim 1, characterized in that, The first plate (11) includes a first plate body and a distributor welded and fixed together with the first plate body; the distributor is formed by stamping the plate, and in a plane perpendicular to the stacking direction, the area enclosed by the projected outer contour of the distributor is smaller than the area enclosed by the projected outer contour of the first plate body; the distributor includes the first circumferential wall (31), and the main heat exchange zone (70) of the first plate (11) is located on the first plate body.

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