Brazed plate heat exchanger with limiting groove

Abstract

This invention relates to a brazed plate heat exchanger with limiting grooves, comprising a front end plate and a rear end plate. Between the front end plate and the rear end plate are several heat exchange plates and copper foil stacked sequentially at intervals. The edges of the heat exchange plates form plate limiting grooves. The flanges of the heat exchange plates are divided into plate sealing surface flanges and plate limiting groove flanges. The flanges of the copper foil are divided into copper foil flanges and copper foil flange gaps. The positions of the copper foil flange gaps correspond to the plate limiting grooves. When two adjacent heat exchange plates are stacked, the gaps between the plate sealing surface flanges contain copper foil flanges, while the gaps between the plate limiting groove flanges are empty of copper foil. During brazing, the copper foil flanges melt upon heating and simultaneously fill the gaps between the sealing surface flanges and the limiting groove flanges through capillary action. After the copper foil solidifies, a sealed heat exchange cavity is formed between two adjacent heat exchange plates. By setting the plate limiting grooves, the sliding distance between the heat exchange plates is reduced without affecting the sealing of the heat exchange plates, thus improving the neatness of the plate heat exchanger.

Description

Technical Field

[0001] This invention relates to brazed plate heat exchangers and belongs to the field of heat exchanger technology. Background Technology

[0002] Offshore wind power is a key area of ​​renewable energy development in my country. Compared with onshore wind farms, offshore wind farms have the advantages of not occupying land resources, being largely unaffected by topography, having higher wind speeds, more abundant wind energy resources, and larger single-unit capacity. The largest single-unit capacity currently available in my country is 16MW, with a rotor diameter of 252 meters and a rotor swept area of ​​approximately 50,000 square meters. The larger the installed capacity of a wind turbine, the higher the power required for the gear oil cooling system, and the larger the heat exchange area of ​​the crucial cooling component, the brazed plate heat exchanger. Given a fixed heat exchange area per plate, higher plate heat exchanger power requirements necessitate a greater number of plates stacked. Current demand exceeds 300 plates, with the total stack height approaching 1 meter.

[0003] In the design of flanges for conventional plate heat exchangers, a certain gap must be reserved between the flanges of two adjacent plates. This gap must be sufficient to accommodate a copper foil of appropriate thickness without the two adjacent plates getting stuck at the flange. The copper foil thickness in plate heat exchangers is generally between 0.04-0.06 mm, so the flange gap between two adjacent plates is generally between 0.06-0.1 mm. The flange gap between the front plate and the heat exchange plates needs to accommodate 2-3 copper foils of appropriate thickness. Furthermore, the effect of thermal expansion and contraction due to temperature differences between the front plate and the heat exchange plates during brazing must be considered. Therefore, the flange gap between the front plate and the heat exchange plates is generally between 0.2-0.4 mm. When the heat exchanger is brazed in the brazing furnace, the copper foil melts at high temperature, allowing adjacent heat exchange plates to move within a range of 0.06-0.1 mm. The maximum distance of movement is the gap between the heat exchange plates. The front plate and the heat exchange plates can move within a range of 0.2-0.4 mm, with the maximum distance of movement also being the gap between the front plate and the heat exchange plates. This phenomenon leads to a greater degree of bending in the heat exchanger as the number of plates stacked increases. When 300 plates are stacked, the maximum bending of the heat exchanger can reach 300 * 0.1 mm = 30 mm, which is unacceptable during unit installation. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a brazed plate heat exchanger with limiting grooves, which is an improvement on the above-mentioned prior art. The copper foil melts during brazing and fills the gap at the limiting groove with capillary action. Without affecting the sealing effect, the gap at the limiting groove does not need to be provided with copper foil interlayer, so a smaller structural gap can be used, thereby limiting the sliding distance between the plate heat exchanger layers and reducing the bending of the plate heat exchanger.

[0005] The technical solution adopted by the present invention to solve the above problems is as follows: a brazed plate heat exchanger with a limiting groove, comprising a front end plate and a rear end plate, wherein a plurality of heat exchange plates and copper foil are arranged in sequence and spaced apart between the front end plate and the rear end plate, wherein the heat exchange plates and the copper foil are respectively formed with flanges in the circumferential direction, characterized in that: the edge of the heat exchange plate forms a plate limiting groove, the flange of the heat exchange plate is divided into a plate sealing surface flange and a plate limiting groove flange, the flange of the copper foil is divided into a copper foil flange and a copper foil flange interval, the setting position of the copper foil flange interval corresponds to the plate limiting groove, when two adjacent heat exchange plates are stacked, the plate sealing surface flange gap is sandwiched with a copper foil flange, and the plate limiting groove flange gap is empty of copper foil, during brazing, the copper foil in the plate sealing surface flange gap is heated and melts, and simultaneously fills the sealing surface flange gap and the limiting groove flange gap through capillary action, after the copper foil is solidified, a heat exchange cavity with a four-sided seal is formed between two adjacent heat exchange plates.

[0006] Preferably, the flange angles of the plate sealing surface are equal at all points, the flange angles of the plate limiting groove are equal at all points, and the flange angle of the plate limiting groove is smaller than the flange angle of the plate sealing surface. When two adjacent heat exchange plates are bonded together, the flange gaps of the sealing surfaces of the two adjacent heat exchange plates are equal around the circumference, the flange gaps of the plate limiting grooves are equal at all points, and the flange gaps of the plate limiting grooves are smaller than the flange gaps of the plate sealing surfaces. Because there is no need to place copper foil in the flange gaps of the plate limiting grooves, the relative sliding distance between the heat exchange plates can be reduced by significantly reducing the flange gaps of the plate limiting grooves, taking advantage of the small gaps.

[0007] Preferably, with a copper foil thickness of 0.04-0.06 mm, the flange gap of the sealing surface of two adjacent heat exchange plates is 0.05-0.1 mm, and the flange gap of the plate limiting groove is 0.01-0.02 mm. In this case, the sliding distance between two adjacent heat exchange plates does not exceed 0.01-0.02 mm.

[0008] Preferably, each of the plate limiting groove flanges includes two short limiting surface flanges and one long limiting surface flange. The two short limiting surface flanges are arranged in an outward V-shape relative to the centerline of the long limiting surface flange. The angle of the short limiting surface flange is equal to the angle of the long limiting surface flange. When two adjacent heat exchange plates are bonded together, the gap between the short limiting surface flanges is equal to the gap between the long limiting surface flanges. The sliding distance between two adjacent heat exchange plates in all directions is equal to the gap between the short limiting surface flanges and the gap between the long limiting surface flanges of the plate limiting groove between the two heat exchange plates, that is, the maximum sliding distance between two adjacent heat exchange plates is between 0.01-0.02 mm. During brazing, the short and long limiting surface gaps of the plate limiting grooves are brazed. The left and right sides are the sealing surface flanges of the heat exchange plates. After the copper foil in the sealing surface flange gaps of the heat exchange plates melts, it fills the short and long limiting surface flange gaps of the plates through capillary action.

[0009] It should be noted that the frame-shaped limiting groove formed by the flanges of the long and short limiting surfaces is not the only design structure in this application. The shape of the plate limiting groove can be arc-shaped, polygonal, etc.

[0010] Preferably, 4-10 plate limiting grooves are evenly spaced around the perimeter of a heat exchange plate, with at least one plate limiting groove on each side of the heat exchange plate. Further, there are multiple plate limiting grooves, symmetrically arranged relative to the horizontal and vertical center lines of the heat exchange plate. This provides a relative sliding limiting effect around the heat exchange plate.

[0011] Preferably, the sum of the lengths of all the plate limiting grooves around the perimeter of the heat exchange plate does not exceed 20% of the circumference of the flange of the heat exchange plate, and the length of a single plate limiting groove does not exceed 2 cm. This ensures that the gaps between the flanges of the plate limiting grooves are filled and sealed during brazing using capillary action.

[0012] In another preferred embodiment of this application, a front plate limiting groove is formed at the edge of the front plate, which corresponds to the plate limiting groove. The front plate forms a flange in the circumferential direction, which is divided into a front plate sealing surface flange and a front plate limiting groove flange. The copper foil is disposed between the front plate and the adjacent heat exchange plate. A copper foil flange is sandwiched between the front plate sealing surface flange and the plate sealing surface flange. There is no copper foil between the front plate limiting groove flange and the plate limiting groove flange.

[0013] Preferably, the flange angle of the front end plate is equal to the flange angle of the heat exchange plate. When the front end plate and the heat exchange plate are attached, the flange of the front end plate limiting groove includes two front end plate short limiting surface flanges (104) and one front end plate long limiting surface flange. The gap between the front end plate short limiting surface flange and the plate short limiting surface flange is smaller than the gap between the front end plate long limiting surface flange and the plate long limiting surface flange. The gap between the front end plate long limiting surface flange and the plate long limiting surface flange is less than or equal to the gap between the front end plate sealing surface flange and the plate sealing surface flange.

[0014] Preferably, the gap between the short limiting surface flange of the front end plate and the short limiting surface flange of the plate is 0.05-0.1 mm, the gap between the long limiting surface flange of the front end plate and the long limiting surface flange of the plate is 0.2-0.4 mm, and the gap between the sealing surface flange of the front end plate and the sealing surface flange of the plate is 0.2-0.4 mm. Thus, the sliding distance of the front end plate relative to the heat exchange plate is 0.05-0.1 mm.

[0015] The gap between the flanges of the front-end plate limiting groove and the plate limiting groove is sealed by the capillary action of the molten copper foil during brazing. No copper foil is needed in the gap, allowing for a smaller gap distance and thus limiting the slippage of the front-end plate relative to the heat exchange plate. Furthermore, considering the structural and functional differences between the front-end plate and the heat exchange plate, a temperature difference exists between them during the cooling process of brazing. The front-end plate temperature is lower than the heat exchange plate temperature, and due to thermal expansion and contraction, the gap between the flanges of the front-end plate and the heat exchange plate shrinks. Since the distance between the two short limiting surfaces of the front-end plate is short, the impact of thermal expansion and contraction is minimal. Therefore, it is preferable to set the flange gap corresponding to the short limiting surface smaller than the flange gap of the long limiting surface. The flange gaps between the long limiting surface flange of the front-end plate and the long limiting surface of the plate, and between the flange of the front-end plate sealing surface and the flange of the heat exchange plate sealing surface, should be set longer to allow for deformation due to thermal expansion and contraction and prevent plate deformation.

[0016] Furthermore, based on the above, the gaps between the front plate sealing surface flange and the plate sealing surface flange, and the gaps between the front plate long limiting surface flange and the plate long limiting surface flange are significantly larger than the gap between the heat exchange plate sealing surface flange, ensuring that 2-3 copper foils are sandwiched between the front plate sealing surface flange and the heat exchange plate sealing surface flange.

[0017] In another embodiment of this application, the edge of the rear plate is divided into a rear plate sealing edge and a rear plate limiting protrusion. The rear plate limiting protrusion corresponds to the plate limiting groove. The copper foil is disposed between the rear plate and the adjacent heat exchange plate. A copper foil flange is sandwiched between the edge surface of the rear plate sealing edge and the flange of the plate sealing surface. There is no copper foil between the edge surface of the rear plate limiting protrusion and the flange of the plate limiting groove.

[0018] The rear end plate limiting protrusion includes two short limiting edges of the rear end plate and one long limiting edge of the rear end plate. The gap between the short limiting edge of the rear end plate and the flange of the short limiting surface of the plate is equal to the gap between the long limiting edge of the rear end plate and the flange of the long limiting surface of the plate. The gap between the rear end plate limiting protrusion and the flange of the limiting groove of the plate is smaller than the gap between the sealing edge of the rear end plate and the flange of the sealing surface of the plate.

[0019] Preferably, the gap between the sealing edge of the rear end plate and the flange of the sealing surface of the plate is 0.1-0.2mm, and the gap between the limiting protrusion of the rear end plate and the flange of the limiting groove of the plate is 0.05-0.01mm.

[0020] The gap between the rear end plate limiting protrusion and the plate limiting groove flange is sealed by the capillary action of the molten copper foil during brazing. No copper foil is needed in the gap, allowing for a smaller gap distance and thus reducing the sliding distance of the rear end plate relative to the heat exchange plate. The sliding distance of the rear end plate relative to the heat exchange plate in all directions does not exceed the gap between the rear end plate limiting protrusion and the plate limiting groove flange.

[0021] Preferably, the length of the copper foil flange interval is greater than the length of the plate limiting groove.

[0022] The limiting groove, as a structure on the heat exchange plate and the front end plate flange, uses the limiting groove to reduce the slippage between the front end plate and the heat exchange plate, between the heat exchange plates, and between the heat exchange plate and the rear end plate during brazing, so as to improve the perpendicularity of the heat exchanger in the stacking direction and reduce the bending of the heat exchanger. Attached Figure Description

[0023] Figure 1 This is a front view of the heat exchanger in an embodiment of the present invention;

[0024] Figure 2 This is a side view of the heat exchanger in an embodiment of the present invention;

[0025] Figure 3 for Figure 1 Sectional view of AA;

[0026] Figure 4 for Figure 3 Enlarged view of section A in the middle;

[0027] Figure 5 for Figure 1 BB section view;

[0028] Figure 6 for Figure 5 Enlarged view of section B in the middle;

[0029] Figure 7 for Figure 1 CC section view;

[0030] Figure 8 This is a schematic diagram of the heat exchange plate structure;

[0031] Figure 9 This is a schematic diagram of the structure of copper foil;

[0032] Figure 10 This is a side view of the copper foil.

[0033] Figure 11 This is a schematic diagram of the back-end board structure;

[0034] In the figure, there are: front plate 1, rear plate 2, heat exchange plate 3, copper foil 4, plate limiting groove 301, plate sealing surface flange 302, plate limiting groove flange 303, plate short limiting surface flange 304, plate long limiting surface flange 305, copper foil flange 401, copper foil flange interval 402, front plate limiting groove 101, front plate sealing surface flange 102, front plate short limiting surface flange 104, front plate long limiting surface flange 105, rear plate sealing edge 201, rear plate limiting protrusion 202, rear plate short limiting edge 203, and rear plate long limiting edge 204. Detailed Implementation

[0035] The present invention will be further described in detail below with reference to the accompanying drawings. The embodiments described are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. Example 1

[0036] A brazed plate heat exchanger includes a front plate 1, a rear plate 2, a plurality of heat exchange plates 3 and a plurality of copper foils 4. The heat exchange plates 3 and copper foils 4 are stacked alternately between the front plate 1 and the rear plate 2. Copper foils 4 are provided between the front plate 1 and the foremost heat exchange plate, and between the rear plate 2 and the last heat exchange plate.

[0037] To reduce the relative sliding distance between the heat exchange plates, plate limiting grooves 301 are formed at the edges of the heat exchange plates, and flanges are formed around the perimeter of the heat exchange plates. These flanges are divided into plate sealing surface flanges 302 and plate limiting groove flanges 303 according to their positions. Correspondingly, the flanges of the copper foil 4 are divided into copper foil flanges 401 and copper foil flange intervals 402. The copper foil flange 401 corresponds to the plate sealing surface flange 302, and the position of the copper foil flange intervals 402 corresponds to the plate limiting grooves 301. The width of the copper foil flange intervals 402 is slightly larger than the width of the plate limiting grooves 301. When two adjacent heat exchange plates are stacked, the gap between the flanges 302 of the sealing surface of the plates is filled with copper foil flanges 401, while the gap between the flanges 303 of the plate limiting grooves is not filled with copper foil. During brazing, the copper foil in the gap between the flanges 302 of the sealing surface of the plates is heated and melts, and fills the gap between the flanges 302 of the sealing surface of the plates and the flange gap between the flanges 303 of the plate limiting grooves through capillary action. After the copper foil is cured, a heat exchange cavity with a four-sided seal is formed between the two adjacent heat exchange plates for the medium to flow.

[0038] The flange angles of the plate sealing surface flange 302 are equal at all points. When two adjacent heat exchange plates are stacked, the circumferential gap between the flanges 302 of the plate sealing surfaces of the two heat exchange plates is equal, with a gap between 0.05-0.1mm. The thickness of the copper foil 4 is 0.04-0.06mm, so the gap of the sealing surface exactly meets the thickness of one copper foil. However, there is no copper foil in the gap of the plate limiting groove flange 303, and the gap can be smaller than that of the plate sealing surface flange, with a gap between 0.01-0.02mm. Therefore, the relative sliding distance between two adjacent heat exchange plates does not exceed 0.01-0.02mm.

[0039] Each plate limiting groove flange 303 includes three limiting surfaces: two short limiting flanges 304 and one long limiting flange 305. When two adjacent heat exchange plates are fully bonded, the gap between the short limiting flanges 304 and the gap between the long limiting flanges 305 of the two heat exchange plates are equal, with a gap between 0.01-0.02 mm.

[0040] Six plate limiting grooves 301 are evenly spaced around the perimeter of the flange of a heat exchange plate. Two plate limiting grooves 301 are provided on each of the two long sides of the heat exchange plate, and one plate limiting groove 301 is provided on each of the two short sides of the heat exchange plate. The six plate limiting grooves are symmetrically arranged relative to the horizontal and vertical center lines of the heat exchange plate. The sum of the lengths of all limiting grooves does not exceed 20% of the perimeter of the flange of the heat exchange plate, and the length of a single limiting groove does not exceed 2 cm.

[0041] The flange angle of the plate limiting groove is smaller than the flange angle of the plate sealing surface, and the flange angles of the three limiting surfaces of the plate limiting groove are equal. The two shorter limiting surfaces are arranged in an outward V-shape relative to the centerline of the longer limiting surface. In the figure, the flange angle refers to the angle between the flange and the vertical plane.

[0042] By setting plate limiting grooves on each side of the heat exchange plates, the copper foil melts and fills the limiting grooves of adjacent heat exchange plates during brazing, achieving a seal. This allows for smaller gaps and restricts relative slippage between the heat exchange plates, thus ensuring the uniformity of the heat exchange plates after brazing. Example 2

[0043] Based on Embodiment 1, the front-end plate 1 is provided with a front-end plate sealing surface flange 102 and a front-end plate limiting groove flange corresponding to the flanges of the heat exchange plate 3. The front-end plate limiting groove flange also includes two front-end plate short limiting surface flanges 104 and one front-end plate long limiting surface flange 105. The copper foil 4 is disposed between the front-end plate and the adjacent heat exchange plate, a copper foil flange 401 is sandwiched between the front-end plate sealing surface flange 102 and the plate sealing surface flange 302, and there is no copper foil between the front-end plate limiting groove flange and the plate limiting groove flange 303.

[0044] Two to three copper foils, typically 0.04-0.06 mm thick, are sandwiched between the front-end plate 1 and the heat exchange plate 3. Copper foil is also sandwiched between the front-end plate sealing surface flange 102 and the plate sealing surface flange 302. During the brazing cooling stage, there is a temperature difference between the front-end plate 1 and the heat exchange plate 3. Since the front-end plate 1 is cooler than the heat exchange plate, the flange gap between the front-end plate 1 and the heat exchange plate 3 decreases due to thermal expansion and contraction. Considering this factor, the gap between the front-end plate sealing surface flange 102 and the plate sealing surface flange 302 is set at 0.2-0.4 mm, with equal flange angles. There is no copper foil between the short limiting surface flange 104 of the front board and the short limiting surface flange 304 of the plate. The distance between the two short limiting surface flanges of the front board is short, so the influence of thermal expansion and contraction is small. The gap between the short limiting surface flange 104 of the front board and the short limiting surface flange 304 of the plate is set to 0.05-0.1mm. A larger gap of 0.2-0.4mm is used between the long limiting surface flange 105 of the front board and the long limiting surface flange 305 of the plate to allow for deformation due to thermal expansion and contraction.

[0045] Based on the above settings, the maximum sliding distance between the front end plate and the heat exchange plates in all directions is the gap between the short limiting surface flange of the front end plate and the short limiting surface flange of the plate, which is 0.05-0.1mm. Example 3

[0046] Based on Embodiment 1, the rear end plate 2 is provided with a rear end plate sealing edge 201 and a rear end plate limiting protrusion 202 corresponding to the sealing surface flange and limiting groove flange of the heat exchange plate 3. The rear end plate limiting protrusion 202 includes two short rear end plate limiting edges 203 and one long rear end plate limiting edge 204. The gap between the rear end plate sealing edge 201 and the sealing surface flange 302 of the plate is between 0.1 and 0.2 mm. The gap between the rear end plate limiting protrusion 202 and the limiting groove flange 303 of the plate is between 0.05 and 0.1 mm.

[0047] Based on the above settings, the maximum sliding distance between the rear end plate and the heat exchange plates in all directions is the gap between the rear end plate limiting protrusion and the plate limiting groove flange, which is 0.05-0.1mm.

[0048] The brazed plate heat exchanger with the above structure, without the need for external limiting fixtures and without affecting the sealing between the front plate, heat exchange plates, and rear plate, reduces the sliding distance between the front plate and heat exchange plates, the sliding distance between heat exchange plates, and the sliding distance between the heat exchange plates and the rear plate during brazing by setting limiting grooves on the front plate and heat exchange plates and limiting protrusions on the rear plate, thereby improving the overall verticality of the plate heat exchanger.

[0049] In addition to the above embodiments, the present invention also includes other embodiments. All technical solutions formed by equivalent transformation or equivalent substitution should fall within the protection scope of the claims of the present invention.

Claims

1. A brazed plate heat exchanger with a limiting groove, characterized in that: The system includes a front plate (1) and a rear plate (2), with a plurality of heat exchange plates (3) and copper foil (4) stacked sequentially between the front plate (1) and the rear plate (2). The heat exchange plates (3) and the copper foil (4) are respectively formed with flanges in the circumferential direction. The system is characterized in that: the edge of the heat exchange plate forms a plate limiting groove (301), the flange of the heat exchange plate is divided into a plate sealing surface flange (302) and a plate limiting groove flange (303), and the flange of the copper foil is divided into a copper foil flange (401) and a copper foil flange interval section (401). 402), the copper foil flange interval section (402) is set at a position corresponding to the plate limiting groove (301). When two adjacent heat exchange plates are stacked, the gap between the flange (302) of the plate sealing surface is filled with copper foil flange, and the gap between the flange (303) of the plate limiting groove is not filled with copper foil. During brazing, the copper foil in the gap between the flange (302) of the plate sealing surface is heated and melted, and simultaneously fills the gap between the flange of the sealing surface and the gap between the flange of the limiting groove through capillary action. After the copper foil is solidified, a heat exchange cavity with a four-sided seal is formed between the two adjacent heat exchange plates.

2. The brazed plate heat exchanger with limiting groove according to claim 1, characterized in that: The edge of the front plate (1) forms a front plate limiting groove (101), which corresponds to the plate limiting groove (301). The front plate (1) forms a flange in the circumferential direction, which is divided into a front plate sealing surface flange (102) and a front plate limiting groove flange. The copper foil is provided between the front plate and the adjacent heat exchange plate. A copper foil flange (401) is sandwiched between the front plate sealing surface flange (102) and the plate sealing surface flange (302). There is no copper foil between the front plate limiting groove flange and the plate limiting groove flange (303).

3. The brazed plate heat exchanger with limiting groove according to claim 1, characterized in that: The edge of the rear plate (2) is divided into a rear plate sealing edge (201) and a rear plate limiting protrusion (202). The rear plate limiting protrusion (202) corresponds to the plate limiting groove (301). The copper foil is provided between the rear plate (2) and the adjacent heat exchange plate. A copper foil flange is sandwiched between the edge surface of the rear plate sealing edge (201) and the flange of the plate sealing surface (302). There is no copper foil between the edge surface of the rear plate limiting protrusion (202) and the flange of the plate limiting groove (303).

4. The brazed plate heat exchanger with limiting groove according to claim 1, characterized in that: The flange angles of the plate sealing surface flange (302) are equal at all points, the flange angles of the plate limiting groove flange (303) are equal at all points, and the angle of the plate limiting groove flange (303) is smaller than the angle of the plate sealing surface flange (302). When two adjacent heat exchange plates are bonded together, the flange gaps of the sealing surfaces of the two adjacent heat exchange plates are equal around the circumference, the flange gaps of the plate limiting grooves are equal at all points, and the flange gaps of the plate limiting grooves are smaller than the flange gaps of the sealing surfaces.

5. The brazed plate heat exchanger with limiting groove according to claim 4, characterized in that: The flange gap between the sealing surfaces of two adjacent heat exchange plates is 0.05-0.1mm, and the flange gap between the plate limiting grooves is 0.01-0.02mm.

6. The brazed plate heat exchanger with limiting groove according to claim 1, characterized in that: Each of the plate limiting groove flanges (303) includes two plate short limiting surface flanges (304) and one plate long limiting surface flange (305). The two plate short limiting surface flanges are arranged in an outward V-shape relative to the center line of the plate long limiting surface flange. The angle of the short limiting surface flange (304) of the plate is equal to the angle of the long limiting surface flange (305) of the plate; When two adjacent heat exchange plates are bonded together, the gap between the short limiting surface flange (304) and the long limiting surface flange (305) of the plates are equal.

7. The brazed plate heat exchanger with limiting groove according to claim 1, characterized in that: The plate limiting groove (301) is evenly arranged in 4-10 slots around a heat exchange plate, and each side of the heat exchange plate has at least one plate limiting groove (301).

8. The brazed plate heat exchanger with limiting groove according to claim 1, characterized in that: The total length of all the plate limiting grooves around the heat exchange plate does not exceed 20% of the circumference of the flange of the heat exchange plate, and the length of a single plate limiting groove does not exceed 2cm.

9. The brazed plate heat exchanger with limiting groove according to claim 1, characterized in that: There are multiple plate limiting grooves (301), which are arranged symmetrically above, below, left and right relative to the horizontal and vertical center lines of the heat exchange plates.

10. The brazed plate heat exchanger with limiting groove according to claim 2, characterized in that: Each of the plate limiting groove flanges (303) includes two plate short limiting surface flanges (304) and one plate long limiting surface flange (305). The two plate short limiting surface flanges are arranged in an outward V-shape relative to the center line of the plate long limiting surface flange. The angle of the short limiting surface flange of the plate is equal to the angle of the long limiting surface flange of the plate; When two adjacent heat exchange plates are bonded together, the flange gap of the short limiting surface of the plate is equal to the flange gap of the long limiting surface of the plate.

11. The brazed plate heat exchanger with limiting groove according to claim 10, characterized in that: The flange angle of the front end plate (1) is equal to the flange angle of the heat exchange plate (3). When the front end plate (1) and the heat exchange plate (3) are in contact, The front plate limiting groove flange includes two front plate short limiting surface flanges (104) and one front plate long limiting surface flange (105). The gap between the front plate short limiting surface flange (104) and the plate short limiting surface flange (304) is smaller than the gap between the front plate long limiting surface flange (105) and the plate long limiting surface flange. The gap between the flange of the front end plate's long limiting surface and the flange of the plate's long limiting surface is less than or equal to the gap between the flange of the front end plate's sealing surface and the flange of the plate's sealing surface.

12. The brazed plate heat exchanger with limiting groove according to claim 11, characterized in that: The gap between the short limiting surface flange of the front plate and the short limiting surface flange of the plate is 0.05-0.1mm, the gap between the long limiting surface flange of the front plate and the long limiting surface flange of the plate is 0.2-0.4mm, and the gap between the sealing surface flange of the front plate and the sealing surface flange of the plate is 0.2-0.4mm.

13. The brazed plate heat exchanger with limiting groove according to claim 3, characterized in that: Each of the plate limiting groove flanges includes two plate short limiting surface flanges and one plate long limiting surface flange. The two plate short limiting surface flanges are arranged in an outward V-shape relative to the center line of the plate long limiting surface flange. The angle of the short limiting surface flange of the plate is equal to the angle of the long limiting surface flange of the plate; When two adjacent heat exchange plates are bonded together, the flange gap of the short limiting surface of the plate is equal to the flange gap of the long limiting surface of the plate.

14. The brazed plate heat exchanger with limiting groove according to claim 13, characterized in that: The rear end plate limiting protrusion (202) includes two rear end plate short limiting edges (203) and one rear end plate long limiting edge (204). The gap between the rear end plate short limiting edge (203) and the plate short limiting surface flange (304) is equal to the gap between the rear end plate long limiting edge (204) and the plate long limiting surface flange (305). The gap between the rear end plate limiting protrusion (202) and the plate limiting groove flange (303) is smaller than the gap between the rear end plate sealing edge (201) and the plate sealing surface flange (302).

15. The brazed plate heat exchanger with limiting groove according to claim 14, characterized in that: The gap between the sealing edge of the rear end plate and the flange of the sealing surface of the plate is 0.1-0.2mm, and the gap between the limiting protrusion of the rear end plate and the flange of the limiting groove of the plate is 0.05-0.1mm.

16. The brazed plate heat exchanger with limiting groove according to claim 1, 2, or 3, characterized in that: The span of the copper foil flange interval is greater than the length of the plate limiting groove.

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