Dynamic flow self-adaptive plate heat exchanger

Abstract

The dynamic flow self-adaptive plate heat exchanger comprises a front pressing plate and a rear pressing plate, a plurality of heat exchange plates are stacked between the front pressing plate and the rear pressing plate, four channel openings are formed in the surface of the front pressing plate, an external sealing ring, two isolation sealing strips and two flow guide sealing strips are arranged between the adjacent heat exchange plates, the external sealing ring is located on the edge of the heat exchange face, and the flow guide sealing strips are located on the edge of the heat exchange face. A circulation heat exchange area is arranged in the middle of each heat exchange plate, flow guide diffusion areas are arranged at the two ends of each heat exchange plate, a first fluid corner hole and a second fluid corner hole are formed in the two sides of each flow guide diffusion area, and each flow guide diffusion area is communicated with the corresponding first flow guide contraction area and the corresponding second flow guide contraction area. The second fluid corner hole and the second flow guide contraction area are enclosed by the flow guide sealing strip and the external sealing ring, the flow guide sealing strip is provided with a flow stabilizing channel, the isolation sealing strips and the flow guide sealing strips of the front heat exchange plate and the rear heat exchange plate of every two adjacent heat exchange plates are arranged in a staggered and spaced mode, and dynamic flow self-adaptive adjustment can be achieved under different working conditions.

Description

Technical Field

[0001] The present invention belongs to the technical field of heat exchangers, and in particular relates to a plate heat exchanger with dynamic flow self-adaptation. Background Art

[0002] As an important type of heat exchange equipment, plate heat exchangers have been widely used in many industrial fields due to their unique structural design and working principle. They are made of a series of metal sheets with specific corrugated shapes that are precisely stacked together. Many thin rectangular channels are formed between adjacent plates. When the fluid flows in these channels, based on the temperature difference between the fluids on both sides of the plate and the high thermal conductivity of the plate, heat can be quickly and efficiently transferred from the high-temperature fluid to the low-temperature fluid, achieving effective heat exchange. Due to its many significant advantages such as high heat exchange efficiency, low heat loss, compact and lightweight structure, small footprint, wide application scenarios and long service life, plate heat exchangers have become an ideal choice for liquid-liquid and liquid-vapor heat exchange, providing a strong guarantee for the efficient and stable operation of industrial production.

[0003] However, despite the many advantages of plate heat exchangers, there are still some problems that need to be solved in the existing technology during actual application. In the plate heat exchanger, the guide area plays a key role in guiding the fluid to be evenly distributed to each heat exchange channel. In actual industrial production, plate heat exchangers often need to operate under different working conditions. For example, parameters such as the flow rate, temperature, and pressure of the fluid may change with the requirements of the production process. When the working conditions change, the performance of the guide area often decreases significantly. Specifically, the flow cross-section of the guide area of the existing plate heat exchanger is relatively fixed. When the fluid enters the guide area, if the actual flow rate exceeds the design flow rate, the fluid flow rate will increase sharply, resulting in an increase in flow resistance and uneven flow velocity distribution. It may cause turbulence and eddy currents in the guide area, thereby causing pressure drop fluctuations. Pressure drop fluctuations will bring a series of problems, such as increasing fluid transportation energy consumption and reducing system efficiency. It may also cause poor fluid flow and local blockage, affecting the heat exchange effect, and even accelerating equipment wear and shortening service life. On the contrary, when the actual flow rate is less than the design flow rate, the flow velocity of the fluid in the diversion area will slow down, which is prone to backflow and retention, increasing the residence time of the fluid in the diversion area, making it unable to participate in heat exchange in time, and further reducing the heat exchange performance of the heat exchanger.

[0004] In summary, the problem of unstable performance of the existing plate heat exchanger's guide area under different working conditions has become a key factor restricting its further widespread application and performance improvement, and it urgently needs to be solved through technological innovation and optimized design. Summary of the Invention

[0005] In order to solve the technical problems existing in the above-mentioned prior art, the present invention proposes a plate heat exchanger with dynamic flow self-adaptation.

[0006] The technical solution adopted in the present invention is as follows: A plate heat exchanger with dynamic flow self-adaptation comprises a front compression plate and a rear compression plate fastened to the rear side of the front compression plate by a clamping assembly, the surface of the front compression plate is provided with four channel openings that can be connected to the pipeline, a plurality of heat exchange plates stacked in parallel are provided between the front compression plate and the rear compression plate, a sealing assembly is provided between adjacent heat exchange plates to form a heat exchange channel, the sealing assembly comprises an external sealing ring and an internal sealing strip, the external sealing ring is located at the edge of the heat exchange surface, the heat exchange surface comprises a circulation heat exchange area and two guide diffusion areas, the circulation heat exchange area is located in the middle of the heat exchange plate, the two guide diffusion areas are respectively located at the two ends of the circulation heat exchange area, a gradual expansion design is adopted, and first fluid corner holes adapted to the channel openings are respectively provided on both sides of the guide diffusion area and a second fluid corner hole, a first guide contraction area and a second guide contraction area with a tapered design are provided between the first fluid corner hole and the second fluid corner hole and the guide diffusion area respectively, the internal sealing strip is arranged at the four corners inside the external sealing ring, the internal sealing strip includes two isolation sealing strips and two guide sealing strips, the first fluid corner hole and the first guide contraction area are arranged in the area between the external sealing ring and the isolation sealing strip, the second fluid corner hole and the second guide contraction area are arranged in the area between the external sealing ring and the guide sealing strip, the guide sealing strip is provided with a steady flow channel whose cross-sectional area can elastically expand and contract with changes in fluid pressure, and the isolation sealing strips and the guide sealing strips of the preceding heat exchange plate and the following heat exchange plate in the two adjacent heat exchange plates are arranged in an interlaced manner.

[0007] In a further technical solution, a number of fluid channels are provided on the circulation heat exchange zone, the guide diffusion zone, the first guide contraction zone and the second guide contraction zone. The fluid channels on the first guide contraction zone are gradually converged from the first fluid corner hole toward the guide diffusion zone, and the fluid channels on the second guide contraction zone are gradually converged from the second fluid corner hole toward the guide diffusion zone. The fluid channels on the guide diffusion zone gradually diverge from the side away from the circulation heat exchange zone toward the side close to the circulation heat exchange zone, and the fluid channels on the circulation heat exchange zone are arranged in a V shape.

[0008] In a further technical solution, the height of the fluid channel on the circulation and heat exchange area is smaller than the height of the fluid channel on the diversion and diffusion area.

[0009] In a further technical solution, the flow stabilization channel includes a mounting cavity and a plurality of elastic flow channels. The mounting cavity is provided through the flow guide sealing strip. The elastic flow channels are made of flexible diaphragms and are arranged at intervals in the mounting cavity.

[0010] In a further technical solution, the isolation sealing strip includes a corner hole sealing strip and a partition sealing strip, the corner hole sealing strip is located outside the first fluid corner hole, and the partition sealing strip is arranged between the first guide contraction area and the guide diffusion area.

[0011] In a further technical solution, the surfaces of the first fluid corner hole and the second fluid corner hole are both extended with an annular wall, the annular wall is circumferentially provided with a plurality of overflow holes, and the corner hole sealing strip is sleeved on the annular wall of the first fluid corner hole.

[0012] In a further technical solution, the clamping assembly includes a plurality of threaded rods, the threaded rods pass through the front pressing plate and the rear pressing plate, and fastening nuts are threadedly installed at both ends of the threaded rods.

[0013] In a further technical solution, the upper and lower sides of the back of the front pressure plate are respectively connected with an upper guide rod and a lower guide rod by screws, and the rear pressure plate and the heat exchange plate are slidably mounted on the outer sides of the upper guide rod and the lower guide rod.

[0014] In a further technical solution, a fixed column and an elastic pressure piece are also included. The tail ends of the upper guide rod and the lower guide rod are connected to the upper and lower ends of the fixed column by screws, and the two ends of the elastic pressure piece are respectively connected to the fixed column and the rear pressure plate and are in a compressed state.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: The present invention optimizes the fluid flow characteristics by redesigning the diversion area and adopting a three-stage fluid control strategy of contraction, steady flow and diffusion. Specifically, the first diversion contraction area and the second diversion contraction area adopt a gradual contraction design, which accelerates the fluid flow by gradually compressing the cross-sectional area of the fluid channel, effectively eliminating the backflow and local retention caused by too low flow, and laying the foundation for subsequent efficient heat exchange; the cross-sectional area of the steady flow channel can elastically expand and contract with the change of fluid pressure. When the flow increases, the steady flow channel expands to reduce the flow rate to prevent turbulence and pressure drop fluctuations caused by excessively high flow rate. When the flow decreases, the steady flow channel contracts to maintain a stable flow rate to avoid a decrease in heat exchange efficiency due to too low flow rate; and the diversion diffusion area adopts a gradual expansion design, which can guide the fluid to be evenly dispersed to the circulation and heat exchange area, avoid local overheating or overcooling caused by uneven flow distribution, and ensure heat exchange uniformity. This design enables the plate heat exchanger to have the ability to dynamically adapt to flow rates. Even under complex working conditions such as flow fluctuations, pressure changes, and heat load fluctuations, it can still maintain efficient and stable heat exchange performance, and can be effectively applied to a variety of industrial and civil scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will now be described by way of example with reference to the accompanying drawings, in which: Figure 1 It is a structural schematic diagram of the present invention; Figure 2 This is a schematic structural diagram of the heat exchange plate of the present invention; Figure 3 for Figure 2 A partial enlarged schematic diagram of point A in the middle; Figure 4 This is a schematic diagram of the installation of a sealing assembly between two adjacent heat exchange plates of the present invention; Figure 5 for Figure 4 A partial enlarged schematic diagram of point B in the middle.

[0017] Figure markings: 1-front pressing plate, 2-rear pressing plate, 3-channel opening, 4-heat exchange plate, 5-external sealing ring, 6-circulation and heat exchange area, 7-diversion diffusion area, 8-first fluid corner hole, 9-second fluid corner hole, 10-first diversion contraction area, 11-second diversion contraction area, 12-isolation sealing strip, 1201-corner hole sealing strip, 1202-partition sealing strip, 13-diversion sealing strip, 14-installation cavity, 15-elastic flow channel, 16-annular wall, 17-overflow hole, 18-threaded rod, 19-fastening nut, 20-upper guide rod, 21-lower guide rod, 22-fixing column, 23-elastic pressing part. DETAILED DESCRIPTION

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] Example: See Figure 1-Figure 5The present invention provides a plate heat exchanger with dynamic flow self-adaptation, comprising a front pressing plate 1 and a rear pressing plate 2 fastened to the rear side of the front pressing plate 1 by a clamping assembly, the surface of the front pressing plate 1 is provided with four channel openings 3 that can be connected to the pipeline, a plurality of parallel stacked heat exchange plates 4 are provided between the front pressing plate 1 and the rear pressing plate 2, a sealing assembly is provided between adjacent heat exchange plates 4 to form a heat exchange channel, the sealing assembly comprises an external sealing ring 5 and an internal sealing strip, the external sealing ring 5 is located at the edge of the heat exchange surface, the heat exchange surface comprises a circulation heat exchange area 6 and two guide diffusion areas 7, the circulation heat exchange area 6 is located in the middle of the heat exchange plate 4, the two guide diffusion areas 7 are respectively located at the two ends of the circulation heat exchange area 6, for guiding the fluid to be evenly distributed, and a first fluid corner hole 8 and a second fluid corner hole 8 adapted to the channel opening 3 are respectively provided on both sides of the guide diffusion area 7. Fluid corner hole 9, a first guide contraction area 10 and a second guide contraction area 11 for accelerating fluid flow are respectively provided between the first fluid corner hole 8 and the second fluid corner hole 9 and the guide diffusion area 7, the internal sealing strips are arranged at the four corners inside the external sealing ring 5, the internal sealing strips include two isolation sealing strips 12 and two guide sealing strips 13, the first fluid corner hole 8 and the first guide contraction area 10 are arranged in the area between the external sealing ring 5 and the isolation sealing strip 12, the second fluid corner hole 9 and the second guide contraction area 11 are arranged in the area between the external sealing ring 5 and the guide sealing strip 13, the guide sealing strip 13 is provided with a steady flow channel whose cross-sectional area can elastically expand and contract with changes in fluid pressure, and the isolation sealing strips 12 and the guide sealing strips 13 of the front heat exchange plate 4 and the rear heat exchange plate 4 of the two adjacent heat exchange plates 4 are arranged in an interlaced manner.

[0020] In this plate heat exchanger, the front compression plate 1 and the rear compression plate 2 serve as the basic framework, and a plurality of heat exchange plates 4 stacked in parallel are provided between the front compression plate 1 and the rear compression plate 2, and are fastened and installed by a clamping assembly to form a stable overall structure. The four channel openings 3 on the surface of the front compression plate 1 are respectively connected to the external pipes to realize the entry and exit of the fluid. In the heat exchange plates 4 stacked in parallel, the isolation sealing strips 12 and the guide sealing strips 13 of the front heat exchange plate 4 and the rear heat exchange plate 4 of the two adjacent heat exchange plates 4 are arranged in an interlaced manner, that is, in the front heat exchange plate 4, the two first fluid corner holes 8 are isolated from the guide diffusion area 7, and the two second fluid corner holes 9 are connected to the guide diffusion area 7, and together with the circulation heat exchange area 6, they constitute the heat exchange flow channel of the second fluid. In contrast, in the rear heat exchange plate 4, the two second-fluid angular holes 9 are isolated from the diversion and diffusion zone 7, while the two first-fluid angular holes 8 are connected to the diversion and diffusion zone 7 and, together with the circulation and heat exchange zone 6, form the heat exchange flow path for the first fluid. In actual use, these four channel openings 3 serve as the low-temperature fluid inlet, low-temperature fluid outlet, high-temperature fluid outlet, and high-temperature fluid inlet, respectively, according to their positions at the upper left, lower left, upper right, and lower right. Specifically, the two first-fluid angular holes 8 are located at the upper left and lower left, connecting to the low-temperature fluid inlet and outlet, respectively. The two second-fluid angular holes 9 are located at the upper right and lower right, connecting to the high-temperature fluid outlet and inlet, respectively. After the low-temperature fluid and the high-temperature fluid enter the plate heat exchanger, in the previous heat exchange plate 4, the first fluid corner holes 8 on the upper left and lower left are enclosed between the external sealing ring 5 and the isolation sealing strip 12. Due to the isolation, the low-temperature fluid cannot flow into the diversion diffusion area 7, and the second fluid corner holes 9 on the upper right and lower right are enclosed between the external sealing ring 5 and the diversion sealing strip 13. Since a steady flow channel is provided on the diversion sealing strip 13, the second fluid corner holes 9 are connected with the diversion diffusion area 7, and together with the circulation heat exchange area 6, they constitute a heat exchange flow channel for the high-temperature fluid. Therefore, the high-temperature fluid can flow from the second fluid corner hole 9 on the lower right into the diversion diffusion area 7, and into the circulation heat exchange area 6, and then into the diversion diffusion area 7 on the other side, and finally into the second fluid corner hole 9 on the upper right. On the contrary, in the latter heat exchange plate 4, since the positions of the isolation sealing strip 12 and the guide sealing strip 13 are swapped, the second fluid corner holes 9 on the upper right and lower right are enclosed between the external sealing ring 5 and the isolation sealing strip 12. Due to the isolation, the high-temperature fluid cannot flow into the guide diffusion area 7, while the first fluid corner holes 8 on the upper left and lower left are enclosed between the external sealing ring 5 and the guide sealing strip 13, realizing the connection between the first fluid corner holes 8 and the guide diffusion area 7, and together with the circulation heat exchange area 6, forming a heat exchange flow channel for the low-temperature fluid. Therefore, the low-temperature fluid can flow from the first fluid corner hole 8 on the upper left into the guide diffusion area 7, and into the circulation heat exchange area 6, and then into the guide diffusion area 7 on the other side, and finally into the first fluid corner hole 8 on the lower left.During this process, by forming alternately arranged high-temperature and low-temperature fluid heat exchange channels, the high-temperature and low-temperature fluids do not mix. The heat exchange plates 4, in contact with the high-temperature and low-temperature fluids on either side, release heat and cool down the high-temperature fluid while absorbing heat and warming the low-temperature fluid, achieving heat transfer and completing the heat exchange process. Compared to traditional heat exchangers, this plate heat exchanger optimizes fluid flow characteristics by redesigning the flow guide area and adopting a three-stage flow control strategy: contraction, steady flow, and diffusion. Specifically, the first and second flow guide contraction zones 10 and 11 adopt a tapered design. By gradually compressing the cross-sectional area of the fluid channel, fluid flow is accelerated, effectively eliminating backflow and localized stagnation caused by low flow rates, laying the foundation for subsequent efficient heat exchange. The cross-sectional area of the steady flow channel elastically expands and contracts with changes in fluid pressure. When the flow rate increases, the steady flow channel expands to reduce the flow rate, preventing turbulence and pressure drop fluctuations caused by excessive flow rate. When the flow rate decreases, the steady flow channel contracts to maintain a stable flow rate, avoiding the decrease in heat exchange efficiency caused by low flow rate. The gradually expanding design of the flow diversion zone 7 guides the fluid to be evenly dispersed in the circulation heat exchange zone 6, avoiding local overheating or overcooling caused by uneven flow distribution and ensuring uniform heat exchange. This design enables the plate heat exchanger to have dynamic flow self-adaptation capabilities, maintaining efficient and stable heat exchange performance even under complex operating conditions such as flow fluctuations, pressure changes, and heat load fluctuations, making it effectively applicable to a variety of industrial and civilian scenarios.

[0021] In a specific embodiment, see Figure 2 The circulation heat exchange area 6, the guide diffusion area 7, the first guide contraction area 10 and the second guide contraction area 11 are all provided with a plurality of fluid channels. The fluid channels on the first guide contraction area 10 are gradually converged toward the guide diffusion area 7 by the first fluid corner hole 8, and the fluid channels on the second guide contraction area 11 are gradually converged toward the guide diffusion area 7 by the second fluid corner hole 9. The fluid channels on the guide diffusion area 7 gradually diverge from the side away from the circulation heat exchange area 6 to the side close to the circulation heat exchange area 6. The fluid channels on the circulation heat exchange area 6 are arranged in a V shape.

[0022] The fluid channels on the first flow-guiding contraction zone 10 and the fluid channels on the second flow-guiding contraction zone 11 gradually converge toward the flow-guiding diffusion zone 7 through the first fluid corner holes 8 and the second fluid corner holes 9, respectively. This tapered design accelerates fluid flow by compressing the channel cross-sectional area, effectively eliminating backflow and localized stagnation caused by low flow rates. The fluid channels on the flow-guiding diffusion zone 7 gradually diverge from the side away from the circulation heat exchange zone 6 toward the side close to the circulation heat exchange zone 6. This gradually expanding design effectively guides the fluid to be evenly distributed in the circulation heat exchange zone 6, reducing the problem of localized overheating or overcooling caused by uneven flow distribution and ensuring uniform heat exchange. The fluid channels on the circulation heat exchange zone 6 are arranged in a V-shape, which can enhance fluid disturbance, increase the contact area and contact time between the fluid and the heat exchange plate 4, and improve heat exchange efficiency.

[0023] In a specific embodiment, the height of the fluid channel on the circulation and heat exchange area 6 is smaller than the height of the fluid channel on the diversion and diffusion area 7 .

[0024] The fluid channels in the circulation heat exchange zone 6 are smaller than those in the diversion and diffusion zone 7. When the fluid enters the circulation heat exchange zone 6 from the diversion and diffusion zone 7, the channel cross-sectional area decreases dramatically, forcing the fluid velocity to increase. This local acceleration effect enhances the fluid's turbulence within the circulation heat exchange zone 6, ensuring more complete contact between the fluid and the heat exchange plates 4. This strengthens the heat transfer process, increases the contact area and duration between the fluid and the heat exchange plates 4, and improves heat exchange efficiency.

[0025] In a specific embodiment, see Figure 4 and Figure 5 The flow stabilization channel includes a mounting cavity 14 and a plurality of elastic flow channels 15 . The mounting cavity 14 is provided through the flow guide sealing strip 13 . The elastic flow channels 15 are made of a flexible diaphragm and are arranged at intervals in the mounting cavity 14 .

[0026] The elastic flow channel 15 is made of a flexible diaphragm, a material with the advantages of high elasticity and fatigue resistance. The elastic deformation of the flexible diaphragm realizes dynamic adaptive adjustment of the cross-sectional area of the elastic flow channel 15. When the actual flow rate increases, the fluid pressure acts on the surface of the flexible diaphragm, causing it to elastically expand in the installation cavity 14, and the cross-sectional area of the elastic flow channel 15 increases accordingly, effectively reducing the fluid flow rate. Conversely, when the actual flow rate decreases, the flexible diaphragm automatically rebounds and contracts due to its own elastic potential energy, and the cross-sectional area of the elastic flow channel 15 decreases accordingly, thereby maintaining a stable flow rate. This dynamic adaptive adjustment capability makes the fluid flow more stable, avoids the turbulence or eddy current phenomenon caused by sudden flow changes in traditional fixed flow channels, avoids the occurrence of pressure drop fluctuations and the series of problems caused by pressure drop fluctuations, and provides key technical support for the efficient, stable and long-life operation of plate heat exchangers.

[0027] In a specific embodiment, see Figure 4 The isolation sealing strip 12 includes a corner hole sealing strip 1201 and a partition sealing strip 1202. The corner hole sealing strip 1201 is located outside the first fluid corner hole 8, and the partition sealing strip 1202 is arranged between the first diversion contraction area 10 and the diversion diffusion area 7.

[0028] The isolation sealing strip 12 consists of a corner hole sealing strip 1201 and a partition sealing strip 1202, wherein the corner hole sealing strip 1201 is used to seal the gap between the first fluid corner hole 8 and the heat exchange plate 4, while the partition sealing strip 1202 isolates the first guide contraction area 10 and the guide diffusion area 7 to prevent the fluid from passing through, forming a double seal, and effectively reducing the risk of mixing of high-temperature fluid and low-temperature fluid.

[0029] In a specific embodiment, see Figure 3 and Figure 4 The surfaces of the first fluid corner hole 8 and the second fluid corner hole 9 are both extended with an annular wall 16, and the annular wall 16 is provided with a plurality of overflow holes 17 along the circumferential direction. The corner hole sealing strip 1201 is sleeved on the annular wall 16 of the first fluid corner hole 8.

[0030] Providing annular walls 16 on the surfaces of the first and second fluid corner holes 8, 9 facilitates the positioning and installation of the sealing assembly. After installing the corner hole sealing strips 1201 on the annular walls 16 of the first fluid corner holes 8, fluid cannot flow out of the overflow holes 17 circumferentially along the annular walls 16. Furthermore, during the stacking process of the heat exchange plates 4, operators can identify the stacking order of the heat exchange plates 4 based on the position of the corner hole sealing strips 1201, thereby improving work efficiency and reducing the probability of errors in stacking the heat exchange plates 4.

[0031] In a specific embodiment, see Figure 1 The clamping assembly includes a plurality of threaded rods 18 , which pass through the front pressing plate 1 and the rear pressing plate 2 , and fastening nuts 19 are threadedly installed at both ends of the threaded rods 18 .

[0032] The clamping assembly realizes the fastening connection between the front clamping plate 1 and the rear clamping plate 2 through the coordinated cooperation of the threaded rod 18 and the fastening nut 19, while ensuring that the heat exchange plates 4 can be in close contact and have good sealing. This installation method is not only highly reliable, but also simple in structure, low in maintenance cost, and easy to use.

[0033] In a specific embodiment, see Figure 1 The upper and lower sides of the back of the front pressing plate 1 are respectively connected with an upper guide rod 20 and a lower guide rod 21 by screws, and the rear pressing plate 2 and the heat exchange plate 4 are both slidably sleeved on the outer sides of the upper guide rod and the lower guide rod.

[0034] The upper and lower guide rods 20 and 21 guide the installation of the heat exchange plates 4 and the rear pressure plate 2, ensuring their accurate positioning during installation, improving the parallelism and sealing of the stacked heat exchange plates 4, and ensuring stable operation of the plate heat exchanger under complex operating conditions. Furthermore, the heat exchange plates 4 and the rear pressure plate 2 slide over the outer sides of the upper and lower guide rods, allowing for quick removal and installation of the heat exchange plates 4, thereby adjusting the capacity and heat exchange performance of the plate heat exchanger, effectively improving maintenance efficiency and system availability.

[0035] In a specific embodiment, see Figure 1 , and also includes a fixed column 22 and an elastic pressing member 23. The tail end of the upper guide rod 20 and the tail end of the lower guide rod 21 are connected to the upper and lower ends of the fixed column 22 by screws, and the two ends of the elastic pressing member 23 are respectively connected to the fixed column 22 and the rear pressing plate 2, and are in a compressed state.

[0036] The upper and lower ends of the fixed column 22 are respectively connected to the tail end of the upper guide rod 20 and the tail end of the lower guide rod 21, and are connected to the rear pressing plate 2 through an elastic pressing member 23. The elastic pressing member 23 can be a spring, but is not limited to this. It can give a pressing force to the rear pressing plate 2, so that the front pressing plate 1 and the rear pressing plate 2 can effectively clamp the internal heat exchange plate 4, further improve the sealing between the heat exchange plates 4, thereby avoiding the problem of fluid leakage.

[0037] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A plate heat exchanger with dynamic flow self-adaptation, characterized in that: The invention comprises a front pressing plate (1) and a rear pressing plate (2) fastened to the rear side of the front pressing plate (1) by a clamping assembly, wherein the surface of the front pressing plate (1) is provided with four channel openings (3) that can be connected to the pipeline, a plurality of parallel stacked heat exchange plates (4) are provided between the front pressing plate (1) and the rear pressing plate (2), a sealing assembly is provided between adjacent heat exchange plates (4) and constitutes a heat exchange channel, the sealing assembly comprises an external sealing ring (5) and an internal sealing strip, the external sealing ring (5) is located at the edge of the heat exchange surface, the heat exchange surface comprises a circulation heat exchange area (6) and two guide diffusion areas (7), the circulation heat exchange area (6) is located in the middle of the heat exchange plate (4), the two guide diffusion areas (7) are respectively located at the two ends of the circulation heat exchange area (6), and a gradual expansion design is adopted, and a first fluid corner hole (8) and a second fluid corner hole (9) that are adapted to the channel opening (3) are respectively opened on both sides of the guide diffusion area (7), the first fluid corner hole (8) and the second fluid corner hole (9) are respectively provided on both sides of the guide diffusion area (7), A first flow guide contraction area (10) and a second flow guide contraction area (11) with a tapered design are provided between the hole (8) and the second fluid corner hole (9) and the flow guide diffusion area (7), respectively. The internal sealing strips are provided at the four corners inside the external sealing ring (5). The internal sealing strips include two isolation sealing strips (12) and two flow guide sealing strips (13). The first fluid corner hole (8) and the first flow guide contraction area (10) are provided in the area between the external sealing ring (5) and the isolation sealing strip (12). The second fluid corner hole (9) and the second flow guide contraction area (11) are provided in the area between the external sealing ring (5) and the flow guide sealing strip (13). The flow guide sealing strip (13) is provided with a steady flow channel whose cross-sectional area can elastically expand and contract with changes in fluid pressure. The isolation sealing strips (12) and the flow guide sealing strips (13) of the preceding heat exchange plate (4) and the following heat exchange plate (4) of the two adjacent heat exchange plates (4) are arranged in a staggered and spaced arrangement.

2. The plate heat exchanger with dynamic flow self-adaptation according to claim 1, characterized in that: The circulation heat exchange zone (6), the flow guide diffusion zone (7), the first flow guide contraction zone (10) and the second flow guide contraction zone (11) are all provided with a plurality of fluid channels. The fluid channels on the first flow guide contraction zone (10) are gradually converged from the first fluid corner hole (8) toward the flow guide diffusion zone (7), and the fluid channels on the second flow guide contraction zone (11) are gradually converged from the second fluid corner hole (9) toward the flow guide diffusion zone (7). The fluid channels on the flow guide diffusion zone (7) are gradually diverged from the side away from the circulation heat exchange zone (6) toward the side close to the circulation heat exchange zone (6). The fluid channels on the circulation heat exchange zone (6) are arranged in a V-shape.

3. The plate heat exchanger with dynamic flow self-adaptation according to claim 2, characterized in that: The height of the fluid channel on the circulation and heat exchange area (6) is smaller than the height of the fluid channel on the guide and diffusion area (7).

4. The plate heat exchanger with dynamic flow self-adaptation according to claim 1, characterized in that: The flow stabilization channel comprises a mounting cavity (14) and a plurality of elastic flow channels (15); the mounting cavity (14) is provided through the flow guide sealing strip (13); and the elastic flow channels (15) are made of a flexible diaphragm and are arranged at intervals in the mounting cavity (14).

5. The plate heat exchanger with dynamic flow self-adaptation according to claim 1, characterized in that: The isolation sealing strip (12) comprises a corner hole sealing strip (1201) and a partition sealing strip (1202), wherein the corner hole sealing strip (1201) is located outside the first fluid corner hole (8), and the partition sealing strip (1202) is arranged between the first flow guide contraction area (10) and the flow guide diffusion area (7).

6. The plate heat exchanger with dynamic flow self-adaptation according to claim 5, characterized in that: An annular wall (16) is extended from the surface of the first fluid corner hole (8) and the second fluid corner hole (9), and a plurality of overflow holes (17) are opened in the circumferential direction on the annular wall (16). The corner hole sealing strip (1201) is sleeved on the annular wall (16) of the first fluid corner hole (8).

7. The plate heat exchanger with dynamic flow self-adaptation according to claim 1, characterized in that: The clamping assembly comprises a plurality of threaded rods (18), the threaded rods (18) passing through the front pressing plate (1) and the rear pressing plate (2), and fastening nuts (19) are threadedly mounted on both ends of the threaded rods (18).

8. The plate heat exchanger with dynamic flow self-adaptation according to claim 1, characterized in that: The upper and lower sides of the back of the front pressing plate (1) are respectively connected to an upper guide rod (20) and a lower guide rod (21) by screws, and the rear pressing plate (2) and the heat exchange plate (4) are both slidably sleeved on the outer sides of the upper guide rod and the lower guide rod.

9. The plate heat exchanger with dynamic flow self-adaptation according to claim 8, characterized in that: It also includes a fixed column (22) and an elastic pressing member (23), the tail end of the upper guide rod (20) and the tail end of the lower guide rod (21) are connected to the upper and lower ends of the fixed column (22) by screws, and the two ends of the elastic pressing member (23) are respectively connected to the fixed column (22) and the rear pressing plate (2) and are in a compressed state.

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