Metal expansion type heat exchange plate and heat exchanger

Abstract

The invention discloses a metal expansion type heat exchange plate and a heat exchanger, relates to the technical field of heat exchangers, and aims to improve the heat exchange performance of the heat exchanger, the metal expansion type heat exchange plate comprises a plate pair composed of two metal plates with expansion areas and fixing areas, the edges of the two metal plates are connected through a first metal strip, and the first metal strip is connected with a second metal strip. The first metal strips connected with the first side edges of the metal sheets are provided with fluid inlets and outlets, a plurality of second metal strips are arranged between the fixed areas of the two metal sheets, a reflow channel is formed between the metal sheets through the second metal strips, and a plurality of metal blocks are connected between the bulging areas of the two metal sheets. The metal block is used for fixing an initial bulging position; according to the metal bulging type heat exchange plate and the heat exchanger, the loading capacity of the plate can be improved, the heat exchange performance is effectively enhanced, and the bulging shape and height can be accurately controlled.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchangers, and in particular to a metal expansion type heat exchange plate and a heat exchanger. Background Art

[0002] Plate heat exchangers offer advantages such as high heat transfer coefficient, small footprint, low investment, and easy installation and maintenance. However, due to technical limitations, the design pressure of mainstream plate heat exchangers currently does not exceed 3 MPa, making them unsuitable for applications requiring high pressure, such as waste heat recovery from coal-fired power plants, chemical industry, and metallurgy.

[0003] The pressure-bearing capacity of plate heat exchanger plates can be improved by welding the joints and flow channels of two adjacent metal plates and then expanding them to form a predetermined fluid channel. However, due to the small spacing between welds, high expansion pressure, and high expansion height, the metal plates expand significantly during the expansion process, undergoing plastic deformation and easily accumulating significant residual stress. This can easily lead to stress corrosion in corrosive atmospheres such as flue gas, resulting in the risk of cracking and leakage in the heat exchanger plates. Furthermore, the large expansion amplitude can also result in excessive flow resistance during the flow of the external fluid.

[0004] For example, there is a Chinese patent with publication number CN207317613U, which relates to a plate heat exchanger and an evaporative condenser, wherein the plate heat exchanger includes: a first heat exchange plate and a second heat exchange plate that are pressed and connected to each other; and a medium inlet and a medium outlet connected to the first heat exchange plate and the second heat exchange plate. The plate heat exchanger is formed by using two press-formed heat exchange plates. The forming is neat and the process is simple. The pressure resistance is good and the application range is wide. In addition, the press-formed plates are thin, which effectively reduces the cost and has a good heat exchange effect. However, the Chinese patent with publication number CN207317613U is limited by the plate press-forming process. The channel height between the plate pairs is small and the design range is narrow. The flow resistance is large and it is only suitable for fluids with a small viscosity coefficient. Moreover, the stress is more concentrated in the press-formed plate processing project, and large residual stress is easily left locally, which is prone to stress corrosion cracking in a corrosive environment later. After the plates are press-formed, they are welded by welding technology. At this time, the plates have been deformed to form convex parts, the flatness is difficult to ensure, and there is residual stress, making it difficult to control the welding quality. Summary of the Invention

[0005] In order to improve the heat transfer performance of the heat exchanger, the present invention proposes a metal bulging heat exchange plate and a heat exchanger, which can not only improve the pressure bearing capacity of the plate and effectively enhance the heat transfer performance, but also accurately control the bulging shape and height.

[0006] In order to achieve the above object, the present invention adopts the following technical solution: a metal bulging heat exchange plate, It includes a plate pair consisting of two metal plates with a bulging area and a fixed area. The edges of the two metal plates are connected by a first metal strip. The first metal strip connecting the first side of the metal plate is provided with a fluid inlet and outlet. A plurality of second metal strips are provided between the fixed areas of the two metal plates. The plurality of second metal strips form a folded flow channel between the metal plates. A plurality of metal blocks are connected between the bulging areas of the two metal plates. The metal blocks fix the starting position of the bulging.

[0007] In this technical solution, the height of the channels between the plate pairs can be designed by the height of the metal columns and metal bars. Narrow channels can be designed to increase the flow rate, and wide channels can be designed to reduce the flow resistance. It is suitable for fluids with high viscosity coefficients such as sludge and sewage. During the bulging forming process, the pressure at various parts of the plate is relatively uniform, and it is not easy to form residual stress concentration points. It is suitable for high-pressure and corrosive environments. The welding required for connection with the metal bars and metal blocks can be completed before the plate is deformed. The process is simple and there are few welding defects.

[0008] Preferably, limiting plates are respectively provided at the same distance outwards from both sides of the plate pair in a direction perpendicular to the metal plate, and the limiting plates are parallel to the metal plate.

[0009] Preferably, two metal plates are connected to both sides of the second metal strip, the first end of the second metal strip is connected to the first metal strip on the side of the metal plate, and the second metal strip extends inward from the first end perpendicular to the first metal strip.

[0010] Preferably, the first ends of the plurality of second metal strips are staggeredly arranged at two first metal strips on two sides of the metal plate, and two adjacent second metal strips are spaced the same distance apart in a direction parallel to the side of the metal plate.

[0011] Preferably, the two metal plates are identical rectangular plates, the bulging areas are several circular areas arranged on the rectangular plates, the several circular areas are distributed in an array, and the area on the metal plate except the bulging areas is a fixed area.

[0012] Preferably, before swelling, the swelling area of the metal sheet is concave inwards; during the swelling process, the swelling area of the metal sheet is deformed and bulges outwards, and the fixed area of the metal sheet is not deformed.

[0013] Preferably, the metal block is arranged between the corresponding bulging areas of the two metal sheets. The metal block is cylindrical and connects the two metal sheets, serving as the bulging starting point of the bulging areas of the sheets.

[0014] Preferably, the first metal strip is discontinuous at two locations on the first side of the metal plate to form two fluid inlets and outlets, and the fluid enters the return flow channel from one of the fluid inlets and outlets and leaves the return flow channel from the other fluid inlet and outlet.

[0015] Preferably, the diameter of the metal block is smaller than the diameter of the bulging area.

[0016] The present invention also adopts the following technical solution: a plate heat exchanger, using the above-mentioned metal expansion heat exchange plate, including multiple plate pairs placed parallel to each other, a first fluid is passed into each plate pair, and a second fluid is passed between the plate pairs, and the first fluid and the second fluid exchange heat through the plate pairs.

[0017] The beneficial effects of the present invention are: 1) The fold-back flow channel design and bulging process significantly improve the fluid turbulence and heat transfer efficiency; 2) Use limiting plates and metal blocks to fix the starting position of the expansion to ensure the stability and uniformity of the expansion process and avoid structural damage; 3) Use laser welding and simulation optimization to improve manufacturing accuracy and overall performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of a metal expansion type heat exchange plate of the present invention.

[0019] Figure 2 It is a structural schematic diagram of a plate heat exchanger of the present invention.

[0020] Figure 3 The present invention discloses a flow chart of plate pair expansion control for a metal expansion type heat exchange plate.

[0021] Reference numerals: metal plate 1; first metal strip 2; fluid inlet and outlet 3; second metal strip 4; metal block 5; limiting plate 6. DETAILED DESCRIPTION

[0022] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific implementation method described herein is only an optimal embodiment of the present invention, which is only used to explain the present invention and does not limit the scope of protection of the present invention. All other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0023] Example 1 This embodiment provides a metal bulging heat exchange plate and a heat exchanger, which can meet the high-temperature and high-pressure heat exchange requirements of the chemical industry and are suitable for processing high-viscosity fluids.

[0024] like Figure 1 As shown, the metal expansion type heat exchange plate comprises a plate pair, which is composed of two thin-walled metal plates 1 of the same size. The metal plates have an expansion area and a fixed area.

[0025] The edges of the two metal sheets are connected by a first metal strip 2 to form an integral structure. The first metal strip is arranged between the sheets for sealing.

[0026] In this embodiment, the four sides of the plate are sealed by first metal strips of a certain thickness, and fluid inlets and outlets 3 are left at the edges.

[0027] Fluid inlets and outlets are provided on the first metal strip for the entry and discharge of fluid.

[0028] Between the fixed areas of the two metal plates, a number of second metal strips 4 are provided. These second metal strips form folded flow channels between the metal plates, optimize the fluid flow path, enhance the turbulence, and thus improve the heat exchange efficiency.

[0029] In addition, several metal blocks 5 are connected between the bulging areas of the two metal sheets. These metal blocks fix the starting position of the bulging and ensure the stability and uniformity of the bulging process.

[0030] The metal sheet is formed into a continuous concave-convex structure between the upper and lower surfaces through a bulging forming process, and the bulging height is controllable.

[0031] In order to precisely control the swelling height and ensure the uniformity and stability of the swelling process, the present invention provides limiting plates 6 on both sides of the plate pair at the same distance outwards perpendicular to the direction of the metal plate.

[0032] The limiting plate is parallel to the metal plate, and the distance between them is set according to the design value of the bulging height, so as to limit the metal plate during the bulging process.

[0033] The second metal strip is connected to two metal plates on either side, with its first end connected to the first metal strip on the side of the metal plate. From the first end, the second metal strip extends inward perpendicular to the first metal strip, forming a staggered flow channel structure. This design not only increases fluid turbulence but also improves heat transfer efficiency.

[0034] The first ends of several second metal strips are staggered between two first metal strips on either side of the metal plate. Adjacent second metal strips are spaced equidistantly parallel to the metal plate's sides, creating a uniform flow path distribution. This arrangement further optimizes the fluid flow path, reduces flow resistance, and improves heat exchange performance.

[0035] In this embodiment, the two metal plates are identical rectangular plates, and the bulging regions are circular areas arranged in an array on the rectangular plates. The areas outside the bulging regions on the metal plates serve as fixed areas for connection and support. This structural design ensures both heat exchange efficiency and overall strength and stability of the plates.

[0036] Before inflation, the expanded area of the metal sheet is concave inward. During inflation, the expanded area deforms and bulges outward, while the fixed area remains unchanged. This design makes the inflation process more controllable and avoids structural damage caused by excessive inflation.

[0037] The cylindrical metal block is placed between the corresponding bulging areas of the two metal plates, connecting the two metal plates. The metal block serves as the starting point for the bulging area of the plate, fixing the starting position and ensuring the stability and uniformity of the bulging process.

[0038] The diameter of the metal block is smaller than the diameter of the bulging area, thereby providing sufficient support for the metal sheet during the bulging process, while avoiding interference between the metal block and the bulging area, ensuring the smooth progress of the bulging process.

[0039] The first metal strip is discontinuous at two locations on the first side of the metal plate, forming two fluid inlets and outlets. Fluid enters the return channel through one inlet and exits through the other. This design simplifies fluid distribution and collection, reduces resistance losses, and improves overall system performance.

[0040] The plate heat exchanger is made of the above-mentioned metal bulging heat exchange plate, refer to Figure 2 The plate heat exchanger comprises multiple parallel plate pairs, with a first fluid flowing through each plate pair and a second fluid flowing between the plate pairs. The first and second fluids exchange heat through the plate pairs, achieving an efficient heat exchange process.

[0041] The following is a detailed description of the manufacturing method of the plate pair, the flow chart is referenced Figure 3 .

[0042] The plate pair manufacturing method includes the steps of design selection, laser welding, limiting and bulging forming.

[0043] Design selection: Based on the heat transfer and pressure bearing capacity requirements of the heat exchange plate pairs, the plate size, thickness, metal material, plate pair spacing, arrangement spacing of metal bars between plate pairs, bulge height and other parameters are optimized through simulation methods to reduce the residual stress of the plate while meeting the pressure bearing capacity and heat transfer performance.

[0044] Laser welding: Based on the design selection, thin-walled metal plate pairs and the metal strips and blocks of the same material used for sealing, fixing the bulging starting position and forming the internal flow field fold between the plate pairs are laser welded to achieve the connection between the metal strips and metal blocks and the plate pairs.

[0045] Limiting and bulging forming: A plate pair limiting bulging forming system is proposed. The system includes a heat exchange plate pair, a limiting plate, an electric pump, an air or water source, an electrical signal sensor, a pressure sensor, a power supply, and a controller.

[0046] Limiting plates are placed parallel to each other at the same distance outward from the plates on either side of the plate pair. The distance between the limiting plates and the heat exchange plates is equal to the design value of the plate expansion height. After the heat exchange plate pair seals the fluid outlet, the fluid inlet is connected to an electric pump and an air or water source. A pressure sensor is installed after the electric pump to monitor and control the expansion pressure.

[0047] The limit plate, heat exchange plate, and electric pump are in the same circuit. The limit plate and the heat exchange plates on both sides are connected to the circuit and in series with the electrical signal sensor. The electric pump is connected in parallel with the above circuit and is also connected to the power supply.

[0048] The controller is connected to the pressure sensor and the electric signal sensor. The controller controls the electric pump after receiving the signal from the pressure and electric signal sensor. When the electric signal sensor receives the electric signal or the pressure sensor measures the pressure P reaches the inflation pressure threshold P max When the controller stops the electric pump.

[0049] The swelling process is described in detail below.

[0050] Install and secure the heat exchange plate pair's bulging system and connect it to power. The plate pair's bulging plates are not in contact with each other, and are in the disconnected state, with I = 0. The air / hydraulic pressure has not reached the controller's set value. The controller controls the electric pump to operate, pumping gas / liquid into the internal flow channels of the plate pair, causing the plates to begin bulging.

[0051] During the expansion process, when the expanded portion of the plate contacts the limit plate, the circuit on that side is connected, and I>0, the pressure sensor's pressure data P is determined to determine whether it exceeds the design pressure P0. If P does not reach P0 at this time, the expansion process is terminated and the design and selection of the heat exchange plate pair are restarted. If P has exceeded P0 at this time, the expansion process is continued.

[0052] When the pressure measured by the pressure sensor reaches the inflation pressure threshold P max When the pressure reaches 1.5 times of the design pressure, the controller turns off the electric pump.

[0053] After the electric pump is turned off and the pressure is maintained for a period of time, the plug of the fluid outlet is removed to end the inflation process.

[0054] Specifically, in this embodiment, to meet the heat transfer requirements of high-viscosity fluids, simulations determined that the plate dimensions were 400mm x 800mm, 1.0mm thick, and made of titanium alloy. The optimized first metal strips were 3mm thick, the vertically staggered second metal strips were spaced 20mm apart, and the metal blocks were 15mm in diameter and spaced 60mm apart.

[0055] Two thin-walled titanium alloy plates are placed on a workbench, and laser welding equipment is used to weld the metal strips and blocks to the plates. This ensures weld quality and connection strength to accommodate the flow and heat transfer requirements of high-viscosity fluids.

[0056] The welded plate pairs were installed in the limited bulging system, with the distance between the limited plate and the heat exchange plate pair set to 15 mm. The electric pump was activated to pump oil into the plate pair, gradually increasing the pressure to the design pressure of 1.5 MPa. When the plate bulged to the limited plate, the electrical signal sensor detected circuit continuity, and the controller determined that the pressure did not exceed the design pressure and continued bulging. When the pressure sensor measured the pressure at 2.0 MPa, the controller shut off the electric pump, maintained the pressure for 15 minutes, and then released it, completing the bulging process.

[0057] The present invention can ensure that the pressure bearing capacity of the plate is higher than the high pressure bearing design requirement through the bulging forming process, thereby expanding the application field of the heat exchange plate.

[0058] The bulged plate has a concave and convex bulging structure between the upper and lower surfaces, which disturbs the flow inside and outside the plate to form turbulent flow. At the same time, the internal return flow channel of the plate increases the heat exchange area of the internal fluid and enhances the heat exchange performance.

[0059] By controlling the bulging height and bulging shape of the upper and lower surfaces through limiting plates, precise control of the bulging process is achieved, excessive bulging is prevented, residual stress in the bulging area is reduced, and flow resistance of the outer fluid is also reduced.

[0060] The existing technology is limited by the plate pressing and forming process. The height of the channels between the plate pairs is small and the design range is narrow, the flow resistance is large, and it is only suitable for fluids with a small viscosity coefficient. The height of the channels between the plate pairs of the present invention can be designed by the height of the metal columns and metal bars. Narrow flow channels can be designed to increase the flow rate, and wide flow channels can be designed to reduce the flow resistance. It is suitable for fluids with a high viscosity coefficient such as sludge and sewage.

[0061] In the prior art press-formed sheet processing, stress is more concentrated, and large residual stress is easily left locally, which is prone to stress corrosion cracking in a corrosive environment. However, during the bulging forming process of the present invention, the pressure at all parts of the sheet is relatively uniform, and residual stress concentration points are not easily formed, making it suitable for high-pressure and corrosive environments.

[0062] In the prior art, the plates are welded by welding technology after being pressed into shape. At this time, the plates have been deformed to form convex parts, the flatness is difficult to ensure, and there is residual stress, making the welding quality difficult to control. The present invention completes the welding and other work required for connection with the metal bars and metal blocks before the plates are deformed. The process is simple and there are fewer welding defects.

[0063] Applying this plate pair to a heat exchanger achieves comprehensive optimization of fluid flow resistance, heat transfer performance, and residual stress. Compared to traditional plate heat exchangers, heat transfer efficiency is increased by 25%, particularly with high-viscosity fluids. After multiple pressure tests, the plate pair has demonstrated stable, leak-free operation at a design pressure of 1.5 MPa. Optimized bulge height and flow channel design significantly reduce residual stress in the plate pair, extending its service life by 30%.

[0064] Example 2 This embodiment provides a metal expansion heat exchange plate and a heat exchanger, which can meet the heat dissipation requirements of electronic equipment and are suitable for scenarios with limited space.

[0065] The metal expansion heat exchange plate comprises a plate pair, which is composed of two thin-walled metal plates 1 of the same size. The metal plates have an expansion area and a fixed area.

[0066] The edges of the two metal sheets are connected by a first metal strip 2 to form an integral structure. The first metal strip is arranged between the sheets for sealing.

[0067] In this embodiment, the four sides of the plate are sealed by first metal strips of a certain thickness, and fluid inlets and outlets 3 are left at the edges.

[0068] Fluid inlets and outlets are provided on the first metal strip for the entry and discharge of fluid.

[0069] Between the fixed areas of the two metal plates, a number of second metal strips 4 are provided. These second metal strips form folded flow channels between the metal plates, optimize the fluid flow path, enhance the turbulence, and thus improve the heat exchange efficiency.

[0070] In addition, several metal blocks 5 are connected between the bulging areas of the two metal sheets. These metal blocks fix the starting position of the bulging and ensure the stability and uniformity of the bulging process.

[0071] The metal sheet is formed into a continuous concave-convex structure between the upper and lower surfaces through a bulging forming process, and the bulging height is controllable.

[0072] In order to precisely control the swelling height and ensure the uniformity and stability of the swelling process, the present invention provides limiting plates at the same distance outwards perpendicular to the direction of the metal plates on both sides of the plate pair.

[0073] The limiting plate is parallel to the metal plate, and the distance between them is set according to the design value of the bulging height, so as to limit the metal plate during the bulging process.

[0074] The second metal strip is connected to two metal plates on either side, with its first end connected to the first metal strip on the side of the metal plate. From the first end, the second metal strip extends inward perpendicular to the first metal strip, forming a staggered flow channel structure. This design not only increases fluid turbulence but also improves heat transfer efficiency.

[0075] The first ends of several second metal strips are staggered between two first metal strips on either side of the metal plate. Adjacent second metal strips are spaced equidistantly parallel to the metal plate's sides, creating a uniform flow path distribution. This arrangement further optimizes the fluid flow path, reduces flow resistance, and improves heat exchange performance.

[0076] In this embodiment, the two metal plates are identical rectangular plates, and the bulging regions are circular areas arranged in an array on the rectangular plates. The areas outside the bulging regions on the metal plates serve as fixed areas for connection and support. This structural design ensures both heat exchange efficiency and overall strength and stability of the plates.

[0077] Before inflation, the expanded area of the metal sheet is concave inward. During inflation, the expanded area deforms and bulges outward, while the fixed area remains unchanged. This design makes the inflation process more controllable and avoids structural damage caused by excessive inflation.

[0078] The cylindrical metal block is placed between the corresponding bulging areas of the two metal plates, connecting the two metal plates. The metal block serves as the starting point for the bulging area of the plate, fixing the starting position and ensuring the stability and uniformity of the bulging process.

[0079] The diameter of the metal block is smaller than the diameter of the bulging area, thereby providing sufficient support for the metal sheet during the bulging process, while avoiding interference between the metal block and the bulging area, ensuring the smooth progress of the bulging process.

[0080] The first metal strip is discontinuous at two locations on the first side of the metal plate, forming two fluid inlets and outlets. Fluid enters the return channel through one inlet and exits through the other. This design simplifies fluid distribution and collection, reduces resistance losses, and improves overall system performance.

[0081] The aforementioned metal bulging heat exchange plates are used to create a plate heat exchanger. The plate heat exchanger comprises multiple parallel plate pairs. A first fluid flows through each plate pair, while a second fluid flows between the plate pairs. The first and second fluids exchange heat through the plate pairs, achieving efficient heat exchange.

[0082] To meet the heat dissipation requirements of electronic equipment, simulations determined the plate dimensions to be 200mm x 400mm, 0.6mm thick, and made of 6061-T6 aluminum alloy. The optimized first metal strip thickness was 1.5mm, the vertically staggered second metal strip spacing was 10mm, and the metal blocks were 8mm in diameter and spaced 40mm apart.

[0083] Two thin-walled aluminum alloy sheets are placed on a workbench, and laser welding equipment is used to weld the metal strips and blocks to the sheets. Welding quality and connection strength are ensured to meet the efficient heat exchange requirements of electronic equipment. Heat input is strictly controlled during the welding process to prevent overheating and deformation of the aluminum alloy.

[0084] The welded plate pair is installed in the limit bulging forming system, and the distance between the limit plate and the heat exchange plate pair is set to 8mm. Gas is pumped into the plate pair through an electric pump, and the pressure change is monitored in real time using a pressure sensor and a controller. When the plate contacts the limit plate and the pressure reaches the threshold, the bulging process is stopped. Start the electric pump, pump air into the plate pair, and gradually increase the pressure to the design pressure of 0.8MPa. When the plate bulges to the limit plate, the electrical signal sensor detects that the circuit is connected, and the controller determines that the pressure does not exceed the design pressure and continues to bulge. When the pressure sensor measures the pressure to reach 1.0MPa, the controller turns off the electric pump, maintains the pressure for 5 minutes, and then releases the pressure to complete the bulging forming.

[0085] The existing technology is limited by the plate pressing and forming process. The height of the channels between the plate pairs is small and the design range is narrow, the flow resistance is large, and it is only suitable for fluids with a small viscosity coefficient. The height of the channels between the plate pairs of the present invention can be designed by the height of the metal columns and metal bars. Narrow flow channels can be designed to increase the flow rate, and wide flow channels can be designed to reduce the flow resistance. It is suitable for fluids with a high viscosity coefficient such as sludge and sewage.

[0086] When the above-mentioned plates are applied to heat exchangers, the heat transfer efficiency is increased by 30% compared with traditional heat dissipation solutions at low Reynolds numbers, significantly reducing the operating temperature of electronic equipment.

[0087] The miniaturized design allows the board to perfectly adapt to the heat dissipation requirements of electronic equipment without taking up additional space.

[0088] After multiple thermal cycle tests, the plate pairs have shown good stability and reliability in long-term operation.

Claims

1. A metal expansion heat exchange plate, characterized in that: The invention comprises a pair of metal sheets (1) each having a bulging area and a fixed area, wherein the edges of the two metal sheets are connected by a first metal strip (2), a fluid inlet and outlet (3) is provided on the first metal strip connected to the first side of the metal sheet, a plurality of second metal strips (4) are provided between the fixed areas of the two metal sheets, the plurality of second metal strips form a folded flow channel between the metal sheets, and a plurality of metal blocks are connected between the bulging areas of the two metal sheets, the metal blocks fixing the bulging starting position.

2. The metal expansion heat exchange plate according to claim 1, characterized in that: Limiting plates are respectively provided at the same distance outwards on both sides of the plate, which are perpendicular to the metal plate, and the limiting plates are parallel to the metal plate.

3. The metal expansion type heat exchange plate according to claim 1, characterized in that: The two sides of the second metal strip are respectively connected to two metal plates, the first end of the second metal strip is connected to the first metal strip on the side of the metal plate, and the second metal strip extends inward from the first end perpendicular to the first metal strip.

4. The metal expansion heat exchange plate according to claim 1, characterized in that: The first ends of the plurality of second metal strips are staggeredly arranged at two first metal strips on two sides of the metal plate, and two adjacent second metal strips are spaced the same distance apart in a direction parallel to the side of the metal plate.

5. The metal expansion heat exchange plate according to claim 1, characterized in that: The two metal plates are identical rectangular plates, the bulging areas are a plurality of circular areas arranged on the rectangular plates, the plurality of circular areas are distributed in an array, and the area on the metal plate except the bulging areas is a fixed area.

6. A metal expansion type heat exchange plate according to claim 1 or 4, characterized in that: Before the expansion, the expansion area of the metal sheet is concave inward; during the expansion process, the expansion area of the metal sheet is deformed and expands outward, and the fixed area of the metal sheet does not deform.

7. The metal expansion heat exchange plate according to claim 1, characterized in that: The metal block is arranged between the corresponding bulging areas of the two metal plates. The metal block is cylindrical and connects the two metal plates, serving as the bulging starting point of the plate bulging areas.

8. The metal expansion type heat exchange plate according to claim 1, characterized in that: The first metal strip is discontinuous at two locations on the first side of the metal plate to form two fluid inlets and outlets. The fluid enters the return flow channel from one of the fluid inlets and outlets and leaves the return flow channel from the other fluid inlet and outlet.

9. A metal expansion type heat exchange plate according to any one of claims 1 or 2 or 3 or 4 or 5 or 7, characterized in that: The diameter of the metal block is smaller than the diameter of the bulging area.

10. A plate heat exchanger using a metal bulging heat exchange plate according to any one of claims 1, 2, 3, 4, 5, or 7, characterized in that: It comprises a plurality of plate pairs placed parallel to each other, a first fluid (9) is passed into each plate pair, a second fluid (10) is passed between the plate pairs, and the first fluid and the second fluid exchange heat through the plate pairs.

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