Plate heat exchanger

Abstract

The invention provides a plate heat exchanger. The plate heat exchanger comprises a plurality of heat transfer plates stacked in a first direction; the first fluid channel and the second fluid channel are formed between the adjacent heat transfer plates and are in fluid isolation with each other; and the fluid blocking structure forms an isolation area in the first fluid channel, so that the isolation area of the first fluid channel is in fluid isolation with other areas of the first fluid channel. By adopting the fluid blocking structure, the performance of the plate heat exchanger is improved.

Description

Technical Field

[0001] The invention relates to a plate heat exchanger. Background Art

[0002] A conventional plate heat exchanger includes a plurality of heat transfer plates, and fluid channels for two or more fluids are formed between adjacent heat transfer plates to perform heat exchange between the two or more fluids. Summary of the invention

[0003] An object of embodiments of the present invention is to provide a plate heat exchanger, whereby for example the performance of the plate heat exchanger may be improved.

[0004] An embodiment of the present invention provides a plate heat exchanger, comprising: a plurality of heat transfer plates stacked along a first direction; a first fluid channel and a second fluid channel formed between adjacent heat transfer plates and fluidically isolated from each other; and a fluid blocking structure, wherein the fluid blocking structure forms an isolation area in the first fluid channel so that the isolation area of ​​the first fluid channel is fluidically isolated from the remaining area of ​​the first fluid channel.

[0005] According to an embodiment of the present invention, the fluid blocking structure surrounds the isolation region in the first fluid channel, or surrounds the isolation region in the first fluid channel together with the edge of the first fluid channel.

[0006] According to an embodiment of the present invention, the first fluid channel has two edge areas opposite to each other in a second direction perpendicular to the first direction; the plate heat exchanger also includes: two first ports, the two first ports are respectively formed in the heat transfer plate on opposite sides of the heat transfer plate in the second direction, and are fluidly connected to the first fluid channel; and two first annular sealing parts are respectively formed on the heat transfer plate around the two first ports, the outer periphery of each of the two first annular sealing parts has an outer peripheral portion in the second direction close to the middle of the heat transfer plate in the second direction, and the fluid blocking structure includes a first fluid blocking structure, the first fluid blocking structure is arranged in the first fluid channel on a side of the outer peripheral portion of the outer periphery of one of the two first annular sealing parts away from the other of the two first annular sealing parts in the second direction, so as to form a corresponding one of the two edge areas as an isolation area.

[0007] According to an embodiment of the present invention, when the plate heat exchanger is in use, the second direction is a vertical direction, and the one edge region of the two edge regions of the first fluid channel is a bottom region or a top region of the first fluid channel.

[0008] According to an embodiment of the present invention, the fluid blocking structure also includes a second fluid blocking structure, which is arranged in the first fluid channel on a side of the outer peripheral portion of the outer peripheral portion of the other of the two first annular sealing portions in the second direction away from the one of the two first annular sealing portions, so as to form the corresponding other edge area of ​​the two edge areas as an isolation area.

[0009] According to an embodiment of the present invention, when the plate heat exchanger is in use, the second direction is a vertical direction, and the two edge regions of the first fluid channel are respectively a bottom region and a top region of the first fluid channel.

[0010] According to an embodiment of the present invention, the fluid blocking structure includes a strip-shaped fluid blocking member.

[0011] According to an embodiment of the present invention, the first fluid blocking structure comprises a strip-shaped fluid blocking member.

[0012] According to an embodiment of the present invention, the fluid blocking member comprises a blocking bar disposed between two adjacent heat transfer plates in the first fluid channel.

[0013] According to an embodiment of the present invention, the fluid blocking member includes two strip-shaped protrusions respectively protruding toward each other from two adjacent heat transfer plates defining the first fluid channel, and the two strip-shaped protrusions are connected to each other.

[0014] According to an embodiment of the present invention, the fluid blocking member comprises: two strip-shaped protrusions protruding toward each other from two adjacent heat transfer plates defining the first fluid channel; and a blocking bar arranged between the two strip-shaped protrusions of the two adjacent heat transfer plates in the first fluid channel.

[0015] According to an embodiment of the present invention, the width of the top of the strip-shaped protrusion is 0.5 mm to 50 mm.

[0016] According to an embodiment of the present invention, the width of the top of the strip-shaped protrusion is 0.5 mm to 50 mm.

[0017] According to an embodiment of the present invention, at least a portion of the fluid barrier has a linear shape.

[0018] According to an embodiment of the present invention, the at least a portion of the fluid barrier makes an angle of 80-90 degrees with the second direction.

[0019] According to an embodiment of the present invention, the strip-shaped protrusion has a circular, triangular or trapezoidal cross section.

[0020] According to an embodiment of the present invention, the strip-shaped protrusion has a circular, triangular or trapezoidal cross section.

[0021] According to an embodiment of the present invention, the top of the strip-shaped protrusion has a concave portion.

[0022] According to an embodiment of the present invention, the top of the strip-shaped protrusion has a concave portion.

[0023] According to an embodiment of the invention, the fluid barrier comprises a portion partially surrounding said one of the two first annular sealing portions.

[0024] According to an embodiment of the present invention, when the plate heat exchanger is in use, the plate heat exchanger is positioned so that the second direction is a vertical direction, and the upper edge of the first fluid blocking structure is lower than the bottom outer peripheral portion of the outer periphery of said one of the two first annular sealing portions, or the upper edge of the first fluid blocking structure is aligned with the bottom outer peripheral portion of the outer periphery of said one of the two first annular sealing portions in the second direction.

[0025] According to an embodiment of the present invention, when the plate heat exchanger is in use, the plate heat exchanger is positioned so that the second direction is a vertical direction, and the fluid blocking member includes a portion that partially surrounds one of the two first annular sealing portions and a portion of the bottom outer peripheral portion whose upper edge is higher than the outer periphery of one of the two first annular sealing portions.

[0026] According to an embodiment of the present invention, the plate heat exchanger further includes: a third fluid channel formed between adjacent heat transfer plates and fluidically isolated from the first fluid channel and the second fluid channel; two second ports, the two second ports are respectively formed in the heat transfer plates on opposite sides of the heat transfer plates in the second direction and are fluidically connected to the second fluid channel; and two third ports, the two third ports are respectively formed in the heat transfer plates on opposite sides of the heat transfer plates in the second direction and are fluidically connected to the third fluid channel.

[0027] According to an embodiment of the present invention, the plate heat exchanger further includes: a third fluid channel formed between adjacent heat transfer plates and fluidically isolated from the first fluid channel and the second fluid channel; two second ports, the two second ports are respectively formed in the heat transfer plate on opposite sides of the heat transfer plate in the second direction and are fluidically connected to the second fluid channel; two second annular sealing portions formed on the heat transfer plate around the two second ports; two third ports, the two third ports are respectively formed in the heat transfer plate on opposite sides of the heat transfer plate in the second direction and are fluidically connected to the third fluid channel; and two third annular sealing portions formed on the heat transfer plate around the two third ports, wherein in the use state of the plate heat exchanger, the plate heat exchanger is positioned so that the second direction is a vertical direction, and the fluid blocking member includes a portion partially surrounding one of the two first annular sealing portions, a portion partially surrounding a corresponding one of the two second annular sealing portions, a portion partially surrounding a corresponding one of the two third annular sealing portions, and a portion of a bottom outer peripheral portion whose upper edge is higher than the outer peripheral edge of the one of the two first annular sealing portions.

[0028] According to an embodiment of the present invention, the plate heat exchanger further comprises: a drain hole formed in the heat transfer plate on a side of the fluid barrier away from the other of the two first annular sealing parts in the second direction, connected to the first fluid channel fluid and isolated from the second fluid channel fluid.

[0029] According to an embodiment of the present invention, the plate heat exchanger also includes: a third fluid channel formed between adjacent heat transfer plates and fluidically isolated from the first fluid channel and the second fluid channel; two second ports, the two second ports are respectively formed in the heat transfer plates on opposite sides of the heat transfer plates in the second direction, and are fluidly connected to the second fluid channel; two third ports, the two third ports are respectively formed in the heat transfer plates on opposite sides of the heat transfer plates in the second direction, and are fluidly connected to the third fluid channel; and a discharge hole, the discharge hole is formed in the heat transfer plate on the side of the fluid blocking member away from the other of the two first annular sealing parts in the second direction, is fluidly connected to the first fluid channel and is fluidly isolated from the second fluid channel and the third fluid channel.

[0030] According to an embodiment of the invention, the fluid blocking structure comprises a filling material.

[0031] According to an embodiment of the present invention, the plate heat exchanger further comprises: two strip-shaped recesses respectively recessed from two adjacent heat transfer plates defining the second fluid channel in a direction away from each other, the strip-shaped recesses of the two adjacent heat transfer plates forming a guide channel,

[0032] According to an embodiment of the present invention, the plate heat exchanger further comprises: a strip-shaped recess formed in the second fluid channel by the strip-shaped protrusions of the heat transfer plate, and the strip-shaped recesses of two adjacent heat transfer plates form a guide channel.

[0033] According to an embodiment of the present invention, the plate heat exchanger further comprises: a strip-shaped recess formed in the second fluid channel by the strip-shaped protrusions of the heat transfer plate, and the strip-shaped recesses of two adjacent heat transfer plates form a guide channel.

[0034] According to an embodiment of the present invention, at least a portion of the guide passage has a linear shape.

[0035] According to an embodiment of the present invention, the at least a portion of the guide channel makes an angle of 80-90 degrees with the second direction.

[0036] According to an embodiment of the present invention, the guiding channel is a plurality of guiding channels arranged along the second direction.

[0037] According to an embodiment of the present invention, the stripe-shaped recess has a plurality of portions having different widths.

[0038] By using the plate heat exchanger according to the embodiment of the present invention, the performance of the plate heat exchanger can be improved, for example, the antifreeze performance of the plate heat exchanger can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is a schematic front view of a plate heat exchanger according to an embodiment of the present invention.

[0040] Figures 2 to 5 Various exemplary cross-sections of strip-like protrusions of a heat transfer plate of a plate heat exchanger are shown.

[0041] Figure 6 4 is a schematic partial enlarged cross-sectional view of a plate heat exchanger according to an embodiment of the present invention.

[0042] Figure 7 4 is a schematic partial enlarged cross-sectional view of a plate heat exchanger according to an embodiment of the present invention.

[0043] Figure 8 is a schematic front view of a plate heat exchanger according to an embodiment of the present invention.

[0044] Fig. 9 is a schematic front view of a plate heat exchanger according to an embodiment of the present invention.

[0045] Fig.10 is a schematic front view of a plate heat exchanger according to an embodiment of the present invention.

[0046] Fig.11 is a schematic front view of a plate heat exchanger according to an embodiment of the present invention.

[0047] Fig.12 is a schematic front view of a plate heat exchanger according to an embodiment of the present invention.

[0048] Fig.13 is a schematic front view of a plate heat exchanger according to an embodiment of the present invention.

[0049] Fig.14 is a schematic front view of a plate heat exchanger according to an embodiment of the present invention.

[0050] Fig.15 is a schematic front view of a plate heat exchanger according to an embodiment of the present invention.

[0051] Fig.16 is a schematic cross-sectional view of a plate heat exchanger according to an embodiment of the present invention. DETAILED DESCRIPTION

[0052] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods.

[0053] See also Figures 1 to 16 The plate heat exchanger 100 according to an embodiment of the present invention includes: a plurality of heat transfer plates 2 stacked along a first direction D1; a first fluid channel 11 and a second fluid channel 12 formed between adjacent heat transfer plates 2 and fluidically isolated from each other; and a fluid blocking structure 4, the fluid blocking structure 4 forming an isolation area in the first fluid channel 11, so that the isolation area of ​​the first fluid channel 11 is fluidically isolated from the remaining area of ​​the first fluid channel 11. For example, the fluid blocking structure 4 surrounds the isolation area in the first fluid channel 11, or surrounds the isolation area in the first fluid channel 11 together with the edge of the first fluid channel 11. The fluid blocking structure 4 may include a filling material 48.

[0054] See also Figures 1 to 16In an embodiment according to the present invention, the first fluid channel 11 has two edge regions or end regions 110 opposite to each other in a second direction D2 perpendicular to the first direction D1. The plate heat exchanger 100 further includes: two first ports 31, the two first ports 31 are respectively formed in the heat transfer plate 2 at two opposite sides of the heat transfer plate 2 in the second direction D2, and are in fluid communication with the first fluid channel 11; and two first annular sealing portions 310 formed on the heat transfer plate 2 around the two first ports 31, respectively, and the outer periphery 311 of each of the two first annular sealing portions 310 has an outer peripheral portion 312 close to the middle of the heat transfer plate 2 in the second direction in the second direction D2. The fluid blocking structure 4 includes a first fluid blocking structure 4, which is arranged in the first fluid channel 11 on a side of the outer peripheral portion 312 of the outer periphery 311 of one of the two first annular sealing portions 310 away from the other of the two first annular sealing portions 310 in the second direction D2, so as to form a corresponding one of the two edge regions 110 as an isolation region.

[0055] See also Figure 1 , 8 -14. In an embodiment of the present invention, the plate heat exchanger 100 further includes: a third fluid channel 13 formed between adjacent heat transfer plates 2 and fluidically isolated from the first fluid channel 11 and the second fluid channel 12; two second ports 32, the two second ports 32 are respectively formed in the heat transfer plate 2 at two opposite sides of the heat transfer plate 2 in the second direction D2, and are fluidically connected to the second fluid channel 12; two second annular sealing portions are respectively formed on the heat transfer plate 2 around the two second ports 32; two third ports 33, the two third ports 33 are respectively formed in the heat transfer plate 2 at two opposite sides of the heat transfer plate 2 in the second direction D2, and are fluidically connected to the third fluid channel 13; and two third annular sealing portions are respectively formed on the heat transfer plate 2 around the two third ports 33.

[0056] According to an example of the present invention, see Fig.16 The first annular sealing portion 310 formed on the heat transfer plate 2 around the first port 31 isolates the second fluid channel 12 and the third fluid channel 13 from the first port 31, so that the first port 31 is in fluid communication with the first fluid channel 11 only. The second annular sealing portion formed on the heat transfer plate 2 around the second port 32 isolates the first fluid channel 11 and the third fluid channel 13 from the second port 32, so that the second port 32 is in fluid communication with the second fluid channel 12 only. The third annular sealing portion formed on the heat transfer plate 2 around the third port 33 isolates the second fluid channel 12 and the third fluid channel 13 from the third port 33, so that the third port 33 is in fluid communication with the third fluid channel 13 only.

[0057] According to an example of the present invention, the first fluid channel 11 is used for a first heat exchange medium, the second fluid channel 12 is used for a second heat exchange medium, and the third fluid channel 13 is used for a third heat exchange medium. The first heat exchange medium may be a liquid such as water, ethylene glycol, propylene glycol, etc., and the second heat exchange medium and the third heat exchange medium may be a refrigerant. According to an example of the present invention, the first heat exchange medium may also be a refrigerant.

[0058] The plate heat exchanger 100 may be a soldered plate heat exchanger, a brazed plate heat exchanger, a gasketed plate heat exchanger or any other type of plate heat exchanger. The plate heat exchanger 100 may also include a cover plate 71 and a bottom plate 72, with the heat transfer plate 2 between the cover plate 71 and the bottom plate 72. The plate heat exchanger 100 may be Figure 1 , 8 - heat exchanger as shown in 14, or Fig.15 The heat exchanger shown or other types of plate heat exchangers. The plate heat exchanger 100 can also be a double-walled heat exchanger.

[0059] See also Figure 1 , 8 -15, when the plate heat exchanger 100 is in use, the second direction D2 is a vertical direction, and the one edge region 110 of the two edge regions 110 of the first fluid channel 11 is a bottom region or a top region of the first fluid channel 11 .

[0060] See also Fig.12 In an embodiment of the present invention, the fluid blocking structure 4 further includes: a second fluid blocking structure 4, which is arranged in the first fluid channel 11 on a side of the outer peripheral portion 312 of the outer peripheral portion 311 of the other of the two first annular sealing portions 310 away from the one of the two first annular sealing portions 310 in the second direction D2, so as to form the corresponding other edge region 110 of the two edge regions 110 as an isolation region. The second fluid blocking structure 4 and the first fluid blocking structure 4 can be the same fluid blocking structure. In the use state of the plate heat exchanger 100, the second direction D2 is a vertical direction, and the two edge regions 110 of the first fluid channel 11 are the bottom region and the top region of the first fluid channel 11, respectively.

[0061] See also Figure 1-13 15. In an embodiment of the present invention, the fluid blocking structure 4 or the first fluid blocking structure 4 comprises a strip-shaped fluid blocking member 47. Figure 7 According to an example of the present invention, the fluid blocking member 47 includes a blocking bar 41 disposed between two adjacent heat transfer plates 2 in the first fluid channel 11. Figure 8According to another example of the present invention, the fluid blocking member 47 includes two strip-shaped protrusions 42 protruding toward each other from two adjacent heat transfer plates 2 defining the first fluid channel 11, and the two strip-shaped protrusions 42 are connected to each other. Figure 7 According to another example of the present invention, the fluid blocking member 47 includes: two strip-shaped protrusions 42 protruding toward each other from two adjacent heat transfer plates 2 defining the first fluid channel 11; and a blocking bar 41 disposed between the two strip-shaped protrusions 42 of the two adjacent heat transfer plates 2 in the first fluid channel 11. Figure 2 The width Tp of the top 420 of the strip-shaped protrusion 42 may be 0.5 mm to 50 mm, 0.5 mm to 10 mm, or 1 mm to 3 mm or other suitable sizes. The width of the blocking strip 41 may be greater than, less than, or equal to the width Tp of the top 420 of the strip-shaped protrusion 42. Figure 8 The top 420 of the strip protrusion 42 may have a variable width along the length of the strip protrusion 42, for example, it may be wider and / or narrower over a portion of the length of the strip protrusion 42, as long as the function of blocking the fluid in the first fluid channel 11 can be achieved. The material of the blocking strip 41 may be the same as or different from that of the heat transfer plate 2. Figure 2-5 The strip protrusion 42 may have a cross section of a circle, a triangle, a trapezoid or any other suitable shape, as long as it can achieve the function of blocking the fluid in the first fluid channel 11. Figure 5 , the top 420 of the strip-shaped protrusion 42 may have a concave portion 421. Thus, the solder can be retained in the concave portion 421. Figure 7 4 shows that the fluid blocking member 47 includes the strip-shaped protrusions 42 and the blocking bars 41 , but the fluid blocking member 47 may include only the blocking bars 41 .

[0062] See also Figure 1 , 8-13, 15, in an embodiment of the present invention, at least a portion of the fluid blocking member 47 has a linear shape. The at least a portion of the fluid blocking member 47 is at an angle of 80-90 degrees to the second direction D2. The fluid blocking member 47 may have a linear shape, and the fluid blocking member 47 may be at an angle of 80-90 degrees to the second direction D2. In addition, in addition to having a linear shape, the fluid blocking member 47 may have a wavy shape, a broken line shape or other suitable shapes in length. When the plate heat exchanger 100 is in use, the plate heat exchanger 100 is positioned so that the second direction D2 is a vertical direction, and the upper edge 40 of the first fluid blocking structure 4 is lower than the bottom outer peripheral portion 313 of the outer periphery 311 of the one of the two first annular sealing portions 310, or the upper edge 40 of the first fluid blocking structure 4 is aligned with the bottom outer peripheral portion 313 of the outer periphery 311 of the one of the two first annular sealing portions 310 in the second direction D2. In addition, the fluid blocking member 47 may be horizontal or inclined. See. Fig.11 The lower edge of the first fluid blocking structure 4 can be aligned in the second direction D2 with the top outer peripheral portion 314 of the outer periphery 311 of the other of the two first annular sealing portions 310. The lower edge of the first fluid blocking structure 4 can be higher or lower than the top outer peripheral portion 314.

[0063] See also Figure 7 , 8 In an embodiment of the present invention, the plate heat exchanger 100 further includes: two strip-shaped recesses 49 respectively recessed from two adjacent heat transfer plates defining the second fluid channel 12 or in each of the second fluid channel 12 and the third fluid channel 13 in a direction away from each other, and the strip-shaped recesses 49 of the two adjacent heat transfer plates 2 form a guide channel 6. Or the plate heat exchanger 100 further includes: a strip-shaped recess 49 formed by the strip-shaped protrusions 42 of the heat transfer plate 2 in the second fluid channel 12 or in each of the second fluid channel 12 and the third fluid channel 13, and the strip-shaped recesses 49 of the two adjacent heat transfer plates 2 form a guide channel 6. At least a portion of the guide channel 6 may have a straight line shape. The at least a portion of the guide channel 6 may be at an angle of 80-90 degrees to the second direction. Thus, the heat exchange medium (e.g., refrigerant) in the second fluid channel 12 or in each of the second fluid channel 12 and the third fluid channel 13 may flow in the guide channel 6. See Figure 8 The top 420 of the strip-shaped protrusion 42 may have a variable width along the length of the strip-shaped protrusion 42, for example, it may be wider and / or narrower over a portion of the length of the strip-shaped protrusion 42. That is, the strip-shaped recess 49 has a plurality of portions with different widths. Thus, the flow characteristics and heat exchange characteristics of the heat exchange medium flowing in the guide channel 6 may be improved. Fig. 9In an embodiment of the present invention, the guide channel 6 includes a plurality of guide channels 6 arranged along the second direction D2, for example, 2, 3 or more guide channels 6. The cross sections of the plurality of guide channels 6 may be the same or different.

[0064] See also Fig.10 In an embodiment of the present invention, the fluid blocking member 47 includes a portion 43 partially surrounding the one of the two first annular sealing portions 310. According to an example of the present invention, in the use state of the plate heat exchanger 100, the plate heat exchanger 100 is positioned so that the second direction D2 is a vertical direction, and the fluid blocking member 47 includes a portion 43 partially surrounding the one of the two first annular sealing portions 310 and a portion 44 whose upper edge 40 is higher than the bottom outer peripheral portion 313 of the outer periphery 311 of the one of the two first annular sealing portions 310. For example, the fluid blocking member 47 includes a portion 43 partially surrounding the one of the two first annular sealing portions 310, a portion 45 partially surrounding a corresponding one of the two second annular sealing portions, a portion 46 partially surrounding a corresponding one of the two third annular sealing portions, and a portion 44 whose upper edge 40 is higher than the bottom outer peripheral portion 313 of the outer periphery 311 of the one of the two first annular sealing portions 310. According to the example of the present invention, the accumulation of the first fluid in the area between the lower second port 32 and the left edge of the heat exchange plate can be prevented or reduced, and the accumulation of the first fluid in the area between the lower third port 33 and the right edge of the heat exchange plate can be prevented or reduced. Fig.13 In an embodiment of the present invention, the plate heat exchanger 100 further includes: a discharge hole 5, which is formed in the heat transfer plate 2 on a side of the fluid blocking member 47 away from the other of the two first annular sealing portions 310 in the second direction D2, and is fluidically connected to the first fluid channel 11 and fluidically isolated from the second fluid channel 12. Figure 3 In the example shown, the drain hole 5 is in fluid communication with the first fluid channel 11 and is fluidly isolated from the second fluid channel 12 and the third fluid channel 13. The plate heat exchanger 100 may include one or more drain holes 5. The drain hole 5 can be used for leak detection in a production line or application. During the production process, if the fluid barrier loses its function, the heat exchange medium may flow into the edge area, causing freezing problems during use, so the fault can be checked through the drain hole. The drain hole can be connected to the application pipeline system or covered with insulation material when applied.

[0065] Although the above embodiment describes that the fluid blocking structure 4 is disposed in the first fluid channel 11, the fluid blocking structure 4 may also be disposed in at least one of the second fluid channel 12 and the third fluid channel 13, or in each of the first fluid channel 11, the second fluid channel 12, and the third fluid channel 13. In addition, the area and size of the fluid blocking structure 4 in each fluid channel may be the same or different, for example, in some fluid channels, the fluid blocking member is narrower, while in other fluid channels, the fluid blocking member is wider.

[0066] See also Fig.14 In an embodiment of the present invention, the first fluid blocking structure 4 includes a filling material 48. The filling material 48 includes a solid material, or a liquid material is used and then the liquid material is solidified. For example, after the brazing of the plate heat exchanger 100 is completed, the edge area 110 (top area and / or bottom area) of at least one of the first fluid channel 11, the second fluid channel 12 and the third fluid channel 13 is filled with an adhesive to play a blocking role. The adhesive can be an epoxy resin. The filling material 48 can also be a low melting point metal or alloy, oil, wax, plastic or any kind of liquid.

[0067] According to the embodiment of the present invention, since the fluid blocking structure 4 is provided at the bottom area of ​​the first fluid channel 11, when the heat exchange medium (e.g., water) is discharged from the first fluid channel 11 when not in use (e.g., in winter or when the ambient temperature is low), less heat exchange medium remains at the bottom area of ​​the first fluid channel 11, or no heat exchange medium remains at the bottom area of ​​the first fluid channel 11, thereby avoiding ice formation at low temperatures or static freezing. Since the fluid blocking structure 4 is provided at the bottom area of ​​the first fluid channel 11, there is no or little heat exchange at the bottom of the second fluid channel 12 or the second fluid channel 12 and the third fluid channel 1, so a large amount of gas vaporized after heat exchange will not be generated, thereby promoting the distribution of the second fluid in the fluid channel 12 or the second fluid in the fluid channel 12 and the third fluid in the third fluid channel 13. In addition, since the guide channel 6 is formed in the second fluid channel 12 or in the second fluid channel 12 and the third fluid channel 13, the heat exchange medium (e.g., refrigerant) in the second fluid channel 12 or in the second fluid channel 12 and the third fluid channel 13 is better distributed, especially for a plate heat exchanger with a larger width (dimension in the third direction perpendicular to the first direction and the second direction). Furthermore, since the fluid blocking structure 4 is provided in the first fluid channel 11, there will be no or little heat transfer in the edge area 110 (bottom area and / or top area), and dynamic freezing during heat transfer can be avoided. In addition, for some applications, the provision of the fluid blocking structure 4 in the edge area 110 (bottom area and / or top area) of the first fluid channel 11 has no negative impact on the heat transfer efficiency, but can reduce the filling amount of the heat exchange medium (e.g., refrigerant). In addition, the formation of an isolation area in the fluid channel by the fluid blocking structure can reduce the filling amount of the heat exchange medium (e.g., refrigerant).

[0068] According to the embodiment of the present invention, the fluid blocking structure is arranged in the heat transfer plate, which does not require additional cost or process and is easy to implement on the product. In addition, the strip protrusion 42 of the fluid blocking structure is arranged in the first fluid channel 11 and the guide channel 6 is formed in the second fluid channel 12, thereby improving the heat transfer efficiency and compensating for the reduction of the heat transfer area. Furthermore, the fluid blocking structure has no effect on the user.

[0069] Although the present invention is described in conjunction with the embodiments, the present invention is not limited to the above embodiments. For example, some embodiments of all embodiments and some technical features of all embodiments can be combined with each other to form new embodiments.

Claims

1. A plate heat exchanger, comprising: a plurality of heat transfer plates stacked along a first direction; a first fluid channel and a second fluid channel formed between adjacent heat transfer plates and fluidly isolated from each other; as well as The fluid blocking structure forms an isolation region in the first fluid channel, so that the isolation region of the first fluid channel is fluidically isolated from the remaining region of the first fluid channel.

2. The plate heat exchanger according to claim 1, wherein: The fluid blocking structure surrounds the isolation region in the first fluid channel, or surrounds the isolation region in the first fluid channel together with the edge of the first fluid channel.

3. The plate heat exchanger according to claim 1, wherein: The first fluid channel has two edge regions that are opposite to each other in a second direction that is perpendicular to the first direction; The plate heat exchanger also includes: two first ports, the two first ports are respectively formed in the heat transfer plate at two opposite sides of the heat transfer plate in the second direction and are in fluid communication with the first fluid channel; and Two first annular sealing portions are formed on the heat transfer plate around the two first ports, respectively, and the outer periphery of each of the two first annular sealing portions has an outer periphery portion in the second direction close to the middle of the heat transfer plate in the second direction, The fluid blocking structure includes a first fluid blocking structure, which is arranged in the first fluid channel on a side of the outer peripheral portion of the outer peripheral portion of one of the two first annular sealing portions away from the other of the two first annular sealing portions in the second direction to form a corresponding one of the two edge regions as an isolation region.

4. The plate heat exchanger according to claim 3, wherein: When the plate heat exchanger is in use, the second direction is a vertical direction, and the one edge region of the two edge regions of the first fluid channel is a bottom region or a top region of the first fluid channel.

5. The plate heat exchanger according to claim 3, wherein: The fluid blocking structure also includes a second fluid blocking structure, which is arranged in the first fluid channel on a side of the outer peripheral portion of the outer peripheral portion of the other of the two first annular sealing portions away from the one of the two first annular sealing portions in the second direction to form the corresponding other edge region of the two edge regions as an isolation region.

6. The plate heat exchanger according to claim 5, wherein: When the plate heat exchanger is in use, the second direction is a vertical direction, and the two edge regions of the first fluid channel are respectively a bottom region and a top region of the first fluid channel.

7. The plate heat exchanger according to claim 1, wherein: The fluid blocking structure includes a strip-shaped fluid blocking member.

8. The plate heat exchanger according to claim 3, wherein: The first fluid barrier structure includes a strip-shaped fluid barrier.

9. The plate heat exchanger according to claim 7 or 8, wherein: The fluid barrier comprises a barrier bar disposed between two adjacent heat transfer plates in the first fluid channel.

10. The plate heat exchanger according to claim 7 or 8, wherein: The fluid blocking member includes two strip-shaped protrusions respectively protruding toward each other from two adjacent heat transfer plates defining the first fluid channel, and the two strip-shaped protrusions are connected to each other.

11. The plate heat exchanger according to claim 7 or 8, wherein: The fluid blocking member includes: two strip-shaped protrusions protruding toward each other from two adjacent heat transfer plates defining the first fluid channel; and a blocking bar disposed between the two strip-shaped protrusions of the two adjacent heat transfer plates in the first fluid channel.

12. The plate heat exchanger according to claim 10, wherein: The width of the top of the strip-shaped protrusion is 0.5 mm to 50 mm.

13. The plate heat exchanger according to claim 11, wherein: The width of the top of the strip-shaped protrusion is 0.5 mm to 50 mm.

14. The plate heat exchanger according to claim 7 or 8, wherein: At least a portion of the fluid barrier has a linear shape.

15. The plate heat exchanger according to claim 14, wherein: The at least a portion of the fluid barrier is at an angle of 80-90 degrees to the second direction.

16. The plate heat exchanger according to claim 10, wherein: The strip-shaped protrusions have a circular, triangular or trapezoidal cross section.

17. The plate heat exchanger according to claim 11, wherein: The strip-shaped protrusions have a circular, triangular or trapezoidal cross section.

18. The plate heat exchanger according to claim 10, wherein: The top of the strip-shaped protrusion has a concave portion.

19. The plate heat exchanger according to claim 11, wherein: The top of the strip-shaped protrusion has a concave portion.

20. The plate heat exchanger according to claim 8, wherein: The fluid barrier includes a portion partially surrounding said one of the two first annular sealing portions.

21. The plate heat exchanger according to any one of claims 3 to 6 and 8, wherein: When the plate heat exchanger is in use, the plate heat exchanger is positioned so that the second direction is a vertical direction, the upper edge of the first fluid blocking structure is lower than the bottom outer peripheral portion of the outer periphery of said one of the two first annular sealing parts, or the upper edge of the first fluid blocking structure is aligned with the bottom outer peripheral portion of the outer periphery of said one of the two first annular sealing parts in the second direction.

22. The plate heat exchanger according to claim 8, wherein: When the plate heat exchanger is in use, the plate heat exchanger is positioned so that the second direction is a vertical direction, and the fluid blocking member includes a portion that partially surrounds one of the two first annular sealing portions and a portion of a bottom outer peripheral portion whose upper edge is higher than the outer periphery of one of the two first annular sealing portions.

23. The plate heat exchanger according to any one of claims 1 to 8, further comprising: a third fluid channel formed between adjacent heat transfer plates and fluidly isolated from the first fluid channel and the second fluid channel; two second ports, the two second ports are respectively formed in the heat transfer plate at two opposite sides of the heat transfer plate in a second direction and are in fluid communication with the second fluid channel; as well as Two third ports are formed in the heat transfer plate at two opposite sides of the heat transfer plate in the second direction and are in fluid communication with the third fluid channel.

24. The plate heat exchanger according to claim 8, further comprising: a third fluid channel formed between adjacent heat transfer plates and fluidly isolated from the first fluid channel and the second fluid channel; two second ports, the two second ports are respectively formed in the heat transfer plate at two opposite sides of the heat transfer plate in a second direction and are in fluid communication with the second fluid channel; two second annular sealing portions formed on the heat transfer plate around the two second ports respectively; two third ports, the two third ports are respectively formed in the heat transfer plate at two opposite sides of the heat transfer plate in the second direction and are in fluid communication with the third fluid channel; as well as Two third annular sealing portions are formed on the heat transfer plate around the two third ports respectively, Wherein, when the plate heat exchanger is in use, the plate heat exchanger is positioned so that the second direction is a vertical direction, and the fluid blocking member includes a portion partially surrounding one of the two first annular sealing parts, a portion partially surrounding a corresponding one of the two second annular sealing parts, a portion partially surrounding a corresponding one of the two third annular sealing parts, and a portion of a bottom outer peripheral portion whose upper edge is higher than the outer periphery of the one of the two first annular sealing parts.

25. The plate heat exchanger according to claim 8, further comprising: A discharge hole is formed in the heat transfer plate at a side of the fluid barrier away from the other of the two first annular sealing portions in the second direction, is fluidly connected to the first fluid passage and is fluidly isolated from the second fluid passage.

26. The plate heat exchanger according to claim 8, further comprising: a third fluid channel formed between adjacent heat transfer plates and fluidly isolated from the first fluid channel and the second fluid channel; two second ports, the two second ports are respectively formed in the heat transfer plate at two opposite sides of the heat transfer plate in a second direction and are in fluid communication with the second fluid channel; two third ports, the two third ports are respectively formed in the heat transfer plate at two opposite sides of the heat transfer plate in the second direction and are in fluid communication with the third fluid channel; as well as A discharge hole is formed in the heat transfer plate at a side of the fluid barrier away from the other of the two first annular sealing portions in the second direction, is fluidly connected to the first fluid channel and is fluidly isolated from the second and third fluid channels.

27. The plate heat exchanger according to any one of claims 1 to 8, wherein: The fluid barrier structure comprises a filling material.

28. The plate heat exchanger according to claim 1, further comprising: Two strip-shaped recesses are respectively recessed from two adjacent heat transfer plates defining the second fluid channel toward directions away from each other, and the strip-shaped recesses of the two adjacent heat transfer plates form a guide channel.

29. The plate heat exchanger according to claim 10, further comprising: The strip-shaped recesses are formed in the second fluid channel by the strip-shaped protrusions of the heat transfer plates, and the strip-shaped recesses of two adjacent heat transfer plates form a guide channel.

30. The plate heat exchanger according to claim 11, further comprising: The strip-shaped recesses are formed in the second fluid channel by the strip-shaped protrusions of the heat transfer plates, and the strip-shaped recesses of two adjacent heat transfer plates form a guide channel.

31. A plate heat exchanger according to any one of claims 28 to 30, wherein: At least a portion of the guide passage has a linear shape.

32. The plate heat exchanger according to claim 31, wherein: The at least a portion of the guide channel is at an angle of 80-90 degrees to the second direction.

33. The plate heat exchanger according to claim 31, wherein: The guiding channels are a plurality of guiding channels arranged along the second direction.

34. A plate heat exchanger according to any one of claims 28 to 30, wherein: The stripe-shaped recess has a plurality of portions having different widths.

Images