Heat exchange plate for plate heat exchanger

Abstract

The utility model provides a kind of heat exchange plate for plate heat exchanger, belong to plate heat exchanger technical field, the heat exchange plate for plate heat exchanger includes: heat exchange plate body, sealing washer, flow guide plate, angle hole subassembly, corrugated structure and connecting joint;The heat exchange plate body is rectangular metal sheet, and the four corners of heat exchange plate body are respectively provided with angle hole, and angle hole place is equipped with angle hole subassembly;The angle hole subassembly includes angle hole sleeve and sealing ring, and angle hole sleeve is fixedly installed in angle hole inner wall, and sealing ring is set around angle hole sleeve outside;The periphery of heat exchange plate body is provided with sealing groove, and sealing washer is embedded in sealing groove, and sealing washer is made of rubber material;The central region of heat exchange plate body is provided with corrugated knot;It can solve the technical problems that the heat exchange plate for plate heat exchanger in prior art has unstable sealing performance, low heat exchange efficiency, uneven fluid distribution leads to undesirable heat transfer effect.

Description

Technical Field

[0001] This utility model belongs to the technical field of plate heat exchangers, and more specifically, relates to a heat exchange plate for a plate heat exchanger. Background Technology

[0002] Plate heat exchangers, as highly efficient and compact heat exchange devices, are widely used in many industrial fields such as chemical, food, pharmaceutical, heating, and refrigeration. The performance of their core component, the heat exchange plates, directly affects the overall efficiency and reliability of the heat exchanger. Traditional plate heat exchanger plates typically employ simple flat plate structures or single corrugated designs, revealing numerous technical shortcomings in practical applications. Existing heat exchange plates generally suffer from unstable sealing performance, primarily due to unreasonable sealing structure design at the corner holes and insufficient fit between the sealing gasket and the sealing groove. This leads to fluid leakage under high-temperature and high-pressure conditions, affecting not only heat exchange efficiency but also potentially causing safety hazards. Furthermore, the corrugated structure design of existing heat exchange plates is simplistic, typically employing straight lines or simple wave shapes, failing to adequately enhance fluid turbulence intensity and resulting in low heat transfer area utilization, leading to unsatisfactory overall heat exchange efficiency. In addition, existing fluid distribution designs lack effective flow guidance mechanisms, easily resulting in uneven fluid distribution upon entering the heat exchange area, with localized areas exhibiting excessively high flow velocities or stagnation, affecting heat transfer uniformity. To address these technical challenges, existing solutions mainly include increasing the thickness of the sealing gasket, adopting more complex corrugated structures, and adding flow guiding devices. However, these solutions often suffer from drawbacks such as high manufacturing costs, complex structures, and insufficient reliability, making them difficult to widely apply in engineering practice. Utility Model Content

[0003] In view of this, the present invention provides a heat exchange plate for a plate heat exchanger, which can solve the technical problems of unstable sealing performance, low heat exchange efficiency, and uneven fluid distribution leading to unsatisfactory heat transfer effect in the heat exchange plates of the prior art.

[0004] This utility model is implemented as follows: This utility model provides a heat exchange plate for a plate heat exchanger, comprising: a heat exchange plate body, a sealing gasket, a guide plate, a corner hole assembly, a corrugated structure, and a connecting joint; the heat exchange plate body is a rectangular metal plate, with corner holes respectively opened at the four corners of the heat exchange plate body, and corner hole assemblies installed at the corner holes; the corner hole assembly includes a corner hole sleeve and a sealing ring, the corner hole sleeve is fixedly installed on the inner wall of the corner hole, and the sealing ring is arranged around the outer side of the corner hole sleeve; a sealing groove is opened around the periphery of the heat exchange plate body, and a sealing gasket is embedded in the sealing groove to ensure a tight seal. The sealing gasket is made of rubber material; the central area of ​​the heat exchange plate has a corrugated structure, which is arranged in a herringbone pattern with alternating peaks and troughs; a guide plate is provided on the liquid inlet side of the heat exchange plate, which is fixedly connected to the inner surface of the heat exchange plate by welding, and the guide plate has an arc-shaped structure; a connecting joint is provided on the liquid outlet side of the heat exchange plate, which is fixed to the corner hole sleeve of the corner hole assembly by threaded connection, and the inner diameter of the connecting joint is consistent with the inner diameter of the corner hole sleeve.

[0005] The technical advantages of the heat exchange plates for plate heat exchangers provided by this utility model are as follows: By setting corner hole assemblies at the four corners of the heat exchange plate body, the cooperation design between the corner hole sleeve and the sealing ring can ensure the sealing of the fluid between the heat exchange plates and prevent fluid leakage; the corrugated structure with a herringbone arrangement increases the contact area between the fluid and the heat exchange plate body, improving heat transfer efficiency; the arc structure of the guide plate can guide the fluid to be evenly distributed, avoiding the formation of dead corners on the surface of the heat exchange plate body, and improving heat transfer uniformity; the structure of the sealing gasket embedded in the sealing groove ensures effective sealing between adjacent heat exchange plates and prevents the mixing of different fluids.

[0006] Based on the above technical solution, the heat exchange plates for the plate heat exchanger of this utility model can be further improved as follows: The heat exchange plate is made of stainless steel with a thickness of 0.5 mm to 1.2 mm, a length of 600 mm to 1200 mm, and a width of 400 mm to 800 mm. The corner holes have a diameter of 50 mm to 100 mm and are symmetrically distributed at the four corners of the heat exchange plate.

[0007] Furthermore, the sealing gasket has a circular cross-section, and its outer diameter is 10% to 20% larger than the width of the sealing groove to generate pre-compression force; the distance between the inner edge of the sealing gasket and the effective heat exchange area of ​​the heat exchange plate is 20 mm to 40 mm, and the sealing gasket is fixed in the sealing groove by an adhesive.

[0008] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the circular cross-section design of the sealing gasket can form a good sealing contact in the sealing groove; the pre-compression design with an outer diameter 10% to 20% larger than the width of the sealing groove allows the sealing gasket to undergo appropriate compression deformation after installation, enhancing the sealing effect; the 20 mm to 40 mm distance between the inner edge of the sealing gasket and the effective heat exchange area ensures both sealing performance and effective utilization of the heat exchange area; and the adhesive fixing method ensures that the sealing gasket will not shift during use, maintaining long-term stable sealing performance.

[0009] Furthermore, the peak height of the corrugated structure is 2 mm to 6 mm, and the wave spacing is 8 mm to 15 mm; the herringbone angle of the corrugated structure is 60 degrees to 120 degrees, and the corrugated structure covers 80% to 95% of the central area of ​​the heat exchange plate; the corrugated structure is integrally formed on the heat exchange plate by a stamping process.

[0010] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the design of the corrugated structure with a peak height of 2 mm to 6 mm ensures sufficient heat transfer area while avoiding excessive flow resistance; the specified wave spacing of 8 mm to 15 mm can form a suitable turbulence intensity and enhance the heat transfer effect; the design of the herringbone angle of 60 degrees to 120 degrees allows the fluid to form a spiral flow in the corrugated structure, prolonging the residence time of the fluid on the surface of the heat exchange plate; the design of the corrugated structure covering 80% to 95% of the central area of ​​the heat exchange plate maximizes the utilization of the heat transfer area; and the one-piece molding method of stamping ensures the precision and strength of the corrugated structure.

[0011] Furthermore, the guide plate has a crescent-shaped structure with an arc radius of 80 mm to 150 mm and a thickness of 1 mm to 3 mm. The two ends of the guide plate are tangentially connected to the left and right side walls of the heat exchange plate, respectively, and the middle part of the guide plate protrudes into the inner side of the heat exchange plate to form a flow channel.

[0012] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the crescent-shaped design of the guide plate can smoothly guide the fluid into the heat exchange area, reducing the impact and turbulence loss when the fluid enters; the specified radius of curvature of 80 mm to 150 mm ensures a smooth transition when the fluid changes direction; the thickness of 1 mm to 3 mm ensures structural strength without excessively affecting the cross-sectional area of ​​the fluid channel; the design of the guide plate being tangentially connected to the sidewall at both ends eliminates dead angles in fluid flow; the guide channel formed by the inward protrusion in the middle can concentrate the fluid flow direction and improve the uniformity of fluid distribution in the heat exchange area.

[0013] Furthermore, the corner hole sleeve is made of brass, and the clearance between the outer diameter of the corner hole sleeve and the inner diameter of the corner hole is 0.1 mm to 0.3 mm; the sealing ring is made of polytetrafluoroethylene, and the thickness of the sealing ring is 2 mm to 4 mm. The sealing ring is assembled on the outside of the corner hole sleeve by interference fit.

[0014] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the corner hole sleeve is made of brass, which has good thermal conductivity and corrosion resistance, as well as excellent machinability; the fit clearance design of 0.1 mm to 0.3 mm between the outer diameter and the inner diameter of the corner hole ensures assembly accuracy and sealing performance; the sealing ring is made of polytetrafluoroethylene, which has excellent chemical stability and low coefficient of friction; the thickness design of 2 mm to 4 mm provides an appropriate sealing thickness; and the interference fit assembly on the outside of the corner hole sleeve ensures a tight fit between the sealing ring and the sleeve, improving sealing reliability.

[0015] Furthermore, the surface of the heat exchange plate is provided with a plurality of micro-protrusions, the height of which is 0.1 mm to 0.5 mm, the micro-protrusions are evenly distributed on the surface of the heat exchange plate, and the spacing between the micro-protrusions is 5 mm to 10 mm.

[0016] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: setting micro-protrusions with a height of 0.1 mm to 0.5 mm on the surface of the heat exchange plate can increase the surface roughness of the heat exchange plate and improve the heat transfer coefficient; the uniform distribution design of the micro-protrusions on the surface ensures the heat transfer uniformity of the entire heat exchange surface; the spacing design of 5 mm to 10 mm can enhance the heat transfer effect without causing excessive flow resistance; the presence of micro-protrusions can also enhance the turbulence intensity of the fluid to a certain extent, further improving the heat exchange efficiency. At the same time, this surface treatment method has a simple manufacturing process and low cost.

[0017] Furthermore, the crests of the corrugated structure are arc-shaped with a radius of 1 mm to 3 mm, and the troughs of the corrugated structure are also arc-shaped with a radius of 1.5 mm to 4 mm.

[0018] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the design of the crest of the corrugated structure with a rounded shape avoids the obstruction of fluid flow by sharp edges and reduces flow resistance; the rounded radius design of 1 mm to 3 mm provides a smooth fluid channel while ensuring structural strength; the bottom of the trough also adopts a rounded shape with a rounded radius design of 1.5 mm to 4 mm, which avoids the formation of eddies and stagnation of fluid at the bottom of the trough and improves the flow efficiency of the fluid; this rounded shape design can also reduce stress concentration and improve the service life and reliability of the heat exchange plates.

[0019] Furthermore, the sealing groove has a trapezoidal cross-section, with a bottom width of 8 mm to 12 mm, a top opening width of 6 mm to 10 mm, and a depth of 3 mm to 5 mm.

[0020] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the trapezoidal design of the sealing groove cross-section provides better positioning and support for the sealing gasket; the bottom width of 8 mm to 12 mm provides ample installation space for the sealing gasket; the top opening width of 6 mm to 10 mm allows the sealing gasket to form a good sealing contact after compression; the depth of 3 mm to 5 mm ensures that the sealing gasket has sufficient compression space without over-compression that could damage it; and the trapezoidal structure design also prevents the sealing gasket from falling off or shifting during use.

[0021] Furthermore, the outer surface of the connector is provided with multiple threaded grooves, the thread pitch of which is 1.5 mm to 2.5 mm, the depth of which is 0.8 mm to 1.5 mm, and the total length of the connector is 25 mm to 40 mm.

[0022] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the design of multiple threaded grooves on the outer surface of the connecting joint provides a reliable mechanical connection method; the specified thread pitch of 1.5 mm to 2.5 mm ensures both connection strength and ease of assembly and disassembly; the design of thread groove depth of 0.8 mm to 1.5 mm ensures the effective engagement depth of the threads and improves connection reliability; the design of total length of 25 mm to 40 mm provides sufficient thread engagement length while avoiding installation difficulties caused by excessive length; this threaded connection method can withstand greater mechanical and thermal stress and adapt to temperature changes and pressure fluctuations during heat exchanger operation.

[0023] Compared with existing technologies, the beneficial effects of the heat exchange plates for plate heat exchangers provided by this utility model are as follows: This utility model significantly improves the performance defects of traditional plate heat exchanger heat exchange plates by optimizing the overall structural design of the heat exchange plates. First, the matching design of the corner hole sleeve and sealing ring in the corner hole assembly, combined with the embedded structure of the sealing gasket in the sealing groove, forms a multi-layer sealing guarantee system, which greatly improves the sealing reliability of the heat exchange plates and effectively prevents fluid leakage. Second, the herringbone-shaped corrugated structure combined with the surface micro-protrusion design significantly increases the contact area between the fluid and the heat exchange plate, while the arc shape design of the crests and troughs reduces flow resistance and improves the heat transfer coefficient. Third, the crescent-shaped structure of the guide plate can guide the fluid to be evenly distributed in the heat exchange area, eliminating flow dead zones and ensuring the uniformity of heat exchange. In addition, the material selection and dimensional matching design of each component not only ensures structural strength and corrosion resistance, but also achieves reasonable control of manufacturing costs. Overall, the heat exchange plates of this invention have achieved significant improvements in sealing performance, heat exchange efficiency, and fluid distribution uniformity, providing effective technical support for the overall performance optimization of plate heat exchangers. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of a heat exchange plate for a plate heat exchanger; Figure 2 This is a schematic diagram of the corrugated structure; The attached diagram lists the components represented by each number as follows: 10. Heat exchange plate body; 20. Sealing gasket; 30. Baffle plate; 40. Angle hole assembly; 50. Corrugated structure; 60. Connecting joint. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0027] like Figure 1-2The diagram shows a structural schematic of a heat exchange plate for a plate heat exchanger provided by this utility model. The plate includes: a heat exchange plate body 10, a sealing gasket 20, a guide plate 30, a corner hole assembly 40, a corrugated structure 50, and a connecting joint 60. The heat exchange plate body is a rectangular metal plate, with corner holes at each of its four corners. Corner hole assemblies are installed at these corner holes. Each corner hole assembly includes a corner hole sleeve and a sealing ring. The corner hole sleeve is fixedly installed on the inner wall of the corner hole, and the sealing ring surrounds the outer side of the corner hole sleeve. A sealing groove is formed around the perimeter of the heat exchange plate body. The sealing groove is fitted with a sealing gasket made of rubber. The central area of ​​the heat exchange plate has a corrugated structure arranged in a herringbone pattern, with alternating peaks and troughs. A guide plate is provided on the liquid inlet side of the heat exchange plate, which is fixedly connected to the inner surface of the heat exchange plate by welding. The guide plate has an arc-shaped structure. A connecting joint is provided on the liquid outlet side of the heat exchange plate. The connecting joint is fixed to the corner hole sleeve of the corner hole assembly by threaded connection, and the inner diameter of the connecting joint is consistent with the inner diameter of the corner hole sleeve.

[0028] In the above technical solution, the heat exchange plate is made of stainless steel with a thickness of 0.5 mm to 1.2 mm, a length of 600 mm to 1200 mm, and a width of 400 mm to 800 mm; the diameter of the corner holes is 50 mm to 100 mm, and the four corner holes are symmetrically distributed at the four corners of the heat exchange plate.

[0029] Furthermore, in the above technical solution, the cross-section of the sealing gasket is circular, and the outer diameter of the sealing gasket is 10% to 20% larger than the width of the sealing groove to generate pre-compression force; the distance between the inner edge of the sealing gasket and the effective heat exchange area of ​​the heat exchange plate is 20 mm to 40 mm, and the sealing gasket is fixed in the sealing groove by adhesive.

[0030] Furthermore, in the above technical solution, the peak height of the corrugated structure is 2 mm to 6 mm, the wave spacing of the corrugated structure is 8 mm to 15 mm, the herringbone angle of the corrugated structure is 60 degrees to 120 degrees, and the corrugated structure covers 80% to 95% of the central area of ​​the heat exchange plate; the corrugated structure is integrally formed on the heat exchange plate by a stamping process.

[0031] Furthermore, in the above technical solution, the guide plate has a crescent-shaped structure with an arc radius of 80 mm to 150 mm and a thickness of 1 mm to 3 mm. The two ends of the guide plate are tangentially connected to the left and right side walls of the heat exchange plate, respectively, and the middle part of the guide plate protrudes into the inner side of the heat exchange plate to form a flow channel.

[0032] Furthermore, in the above technical solution, the corner hole sleeve is made of brass, and the clearance between the outer diameter of the corner hole sleeve and the inner diameter of the corner hole is 0.1 mm to 0.3 mm; the sealing ring is made of polytetrafluoroethylene, and the thickness of the sealing ring is 2 mm to 4 mm. The sealing ring is assembled on the outside of the corner hole sleeve by interference fit.

[0033] Furthermore, in the above technical solution, the surface of the heat exchange plate is provided with multiple micro-protrusions, the height of the micro-protrusions is 0.1 mm to 0.5 mm, the micro-protrusions are uniformly distributed on the surface of the heat exchange plate, and the spacing between the micro-protrusions is 5 mm to 10 mm.

[0034] Furthermore, in the above technical solution, the crest of the corrugated structure is arc-shaped with a radius of 1 mm to 3 mm, and the trough of the corrugated structure is also arc-shaped with a radius of 1.5 mm to 4 mm.

[0035] Furthermore, in the above technical solution, the cross-section of the sealing groove is trapezoidal, the bottom width of the sealing groove is 8 mm to 12 mm, the top opening width of the sealing groove is 6 mm to 10 mm, and the depth of the sealing groove is 3 mm to 5 mm.

[0036] Furthermore, in the above technical solution, the outer surface of the connecting joint is provided with multiple threaded grooves, the thread pitch of which is 1.5 mm to 2.5 mm, the depth of which is 0.8 mm to 1.5 mm, and the total length of the connecting joint is 25 mm to 40 mm.

[0037] The following is a specific embodiment of this utility model: In this embodiment, the heat exchange plate is made of 316L stainless steel plate with a thickness of 0.8 mm, a length of 900 mm, and a width of 600 mm, which can meet the heat exchange requirements of medium-scale industrial applications. The diameter of the four corner holes is 75 mm, located at the four corners of the heat exchange plate, with the center of each corner hole 80 mm from the edge of the plate, ensuring structural strength and reasonable fluid distribution. The corner hole sleeve in the corner hole assembly is made of brass with an outer diameter of 74.8 mm, forming a 0.2 mm clearance with the inner diameter of the corner hole. It is installed using an interference fit, ensuring assembly accuracy and sealing effect. The sealing ring is made of polytetrafluoroethylene (PTFE) with a thickness of 3 mm, an inner diameter of 70 mm, and an outer diameter of 80 mm. It is fitted onto the outside of the corner hole sleeve using an interference fit, forming a reliable sealing interface. The sealing grooves around the heat exchange plate feature a trapezoidal cross-section design, with a bottom width of 10 mm, a top opening width of 8 mm, and a depth of 4 mm. The sealing gaskets embedded within the grooves are made of nitrile rubber with a cross-sectional diameter of 9 mm, 12.5% ​​larger than the top opening width of the sealing groove, creating appropriate pre-compression. The corrugated structure covers approximately 90% of the central area of ​​the heat exchange plate, arranged in a herringbone pattern with a 90-degree angle. The crest height is 4 mm, and the wave spacing is 12 mm. Both the crests and troughs are rounded with a radius of 2 mm, integrally formed using a precision stamping process to ensure dimensional accuracy and surface quality. Micro-protrusions, 0.3 mm high and 2 mm in diameter, are evenly distributed on the corrugated structure surface at 8 mm intervals, manufactured using laser processing, significantly increasing the heat transfer area. The guide plate is made of 2 mm thick stainless steel sheet, with a crescent shape, a radius of curvature of 120 mm, and a length of 400 mm. It is fixed to the liquid inlet side of the heat exchange plate body by argon arc welding, and the weld is continuous to ensure structural strength and sealing. The connecting joint is made of stainless steel, with an outer diameter of 68 mm, an inner diameter of 65 mm, and a total length of 32 mm. The outer surface is machined with standard threads with a pitch of 2 mm and a depth of 1.2 mm. It is fixed to the corner hole sleeve by threaded connection, with a connection torque of 50 Nm. The manufacturing precision of the entire heat exchange plate is strictly controlled, with a flatness error of no more than 0.5 mm and a corner hole coaxiality error of no more than 0.2 mm, ensuring interchangeability and assembly quality during mass production. Under operating conditions, the heat exchange plate can withstand a maximum working pressure of 1.6 MPa and an operating temperature range of -20 degrees Celsius to 180 degrees Celsius, making it suitable for heat exchange applications of various industrial fluids. Through optimized structural design, the heat transfer coefficient of this heat exchange plate is increased by approximately 35% compared to traditional flat plate designs, while the flow resistance increases by only about 15%, achieving the design goal of high efficiency and low resistance. In terms of sealing performance, it maintains leak-free operation for 24 hours under a test pressure of 1.8 MPa, meeting the stringent requirements of industrial applications.

[0038] The following is another specific embodiment 2 of this utility model: This embodiment 2 is a specially optimized design based on embodiment 1, specifically for high-temperature and high-pressure applications. The thickness of the heat exchange plate is increased to 1.0 mm, and the material is upgraded to higher-strength duplex stainless steel, capable of withstanding higher working pressures and temperatures. The design parameters of the corrugated structure have been adjusted, with the crest height increased to 5 mm, the wave spacing reduced to 10 mm, and the herringbone angle adjusted to 75 degrees. This design provides better structural support under high-pressure conditions while maintaining excellent heat transfer performance. The sealing system has been comprehensively upgraded, with the sealing gaskets made of fluororubber, offering better high-temperature resistance and chemical corrosion resistance, and extending the operating temperature range to -30 degrees Celsius to 220 degrees Celsius. The sealing ring thickness of the corner hole assembly is increased to 4 mm, and a special sealing coating is added to the contact surface, further improving sealing reliability. The surface micro-protrusion design has also been optimized, with the height increased to 0.4 mm and the spacing adjusted to 6 mm, using a denser distribution to adapt to the heat exchange requirements of high-pressure fluids. The baffle plate has been structurally strengthened, with its thickness increased to 2.5 mm and its radius of curvature adjusted to 100 mm, enabling it to better withstand the impact of high-pressure fluids. The connecting joints are manufactured using a forging process, significantly improving structural strength, and the thread depth has been increased to 1.4 mm, ensuring reliable connections under high-pressure conditions. The overall operating pressure rating of the heat exchange plates has been increased to 2.5 MPa, meeting the needs of high-pressure heat exchange applications in petrochemical and power industries. In terms of manufacturing processes, the corrugated structure utilizes a thermoforming process, which better eliminates internal stress and improves structural stability. All welded joints undergo full penetration welding and 100% non-destructive testing, ensuring consistent and reliable product quality.

[0039] The following is another specific embodiment 3 of this utility model: Embodiment 3 is a special design based on Embodiment 1, specifically tailored to the hygienic application requirements of the food and pharmaceutical industries. The surface of the heat exchange plate is electrochemically polished, achieving a surface roughness of Ra 0.4 micrometers or less, meeting the requirements of food-grade hygiene standards. Simultaneously, the surface micro-protrusion design has been adjusted, reducing the height to 0.2 mm for more uniform distribution and preventing the accumulation of contaminants. All components in contact with the fluid are made of 316L stainless steel and undergo special passivation treatment to improve corrosion resistance. The sealing gaskets are made of food-grade silicone rubber, meeting FDA certification standards, free of harmful substances, and suitable for heat exchange in food and pharmaceutical applications. The corner hole assembly design has been improved for hygiene; the inner surface of the corner hole sleeve undergoes a special smoothing treatment to avoid dead corners and gaps, facilitating cleaning and disinfection. The corrugated structure design considers cleanliness requirements; the radius of curvature of the corrugations is increased to 3 mm, reducing cleaning difficulty, while the depth of the corrugated structure is appropriately reduced to 3.5 mm, balancing heat transfer efficiency and cleanliness. The baffle plate design also incorporates hygienic treatment, with a surface polish consistent with the heat exchange plate body. The joints are continuously welded and surface-smoothed to eliminate the possibility of bacterial growth. The entire heat exchange plate structure follows the design principles of sanitary heat exchangers, allowing for effective CIP cleaning and SIP sterilization of all internal surfaces. The connection joints utilize a sanitary clamp design for easy disassembly and cleaning.

[0040] Specifically, the principle of this utility model is as follows: This utility model adopts a systematic structural optimization design concept, solving the problems existing in the prior art through the synergistic effect of multiple key technical features. Regarding sealing performance, a dual sealing design of the corner hole sleeve and sealing ring in the corner hole assembly is adopted. The corner hole sleeve provides structural support and primary sealing, while the sealing ring provides secondary sealing protection through interference fit. Simultaneously, the pre-compression design of the sealing gasket within the trapezoidal cross-section sealing groove forms a triple sealing protection system, fundamentally solving the problem of unstable sealing. Regarding heat transfer efficiency, the herringbone-shaped corrugated structure enables the fluid to form a spiral flow on the plate surface, significantly extending the fluid's residence time and flow path. At the same time, the arc-shaped design of the crests and troughs reduces flow resistance, avoiding unnecessary increases in energy consumption. The surface micro-protrusion design further increases the heat transfer area and surface roughness, improving the heat transfer coefficient, while its uniform distribution ensures consistent heat transfer. Regarding fluid distribution, the crescent-shaped guide plate, through its special arc structure, smoothly guides the incoming fluid to the heat exchange area, avoiding fluid impact and localized high-speed flow. Simultaneously, the tangential connection design between the guide plate and the sidewall eliminates dead zones, ensuring the fluid fully utilizes the entire heat exchange area. The material selection for each component is based on its functional requirements and operating environment: the stainless steel heat exchange plate body provides corrosion resistance and structural strength; the brass corner hole sleeve possesses good thermal conductivity and processing performance; the PTFE sealing ring provides chemical stability; and the rubber sealing gasket ensures an elastic sealing effect. Through the organic combination of these technical features, this invention fundamentally improves the various performance indicators of the heat exchange plate.

[0041] Before use, a pre-inspection of the heat exchange plates is performed, checking for surface flatness, integrity of the corrugated structure, correct installation of gaskets in the sealing grooves, and proper tightening of the corner hole assemblies. Then, according to the design requirements of the plate heat exchanger, multiple heat exchange plates are stacked in an alternating pattern of hot and cold fluids, ensuring effective contact between the gaskets of adjacent plates. During stacking, special attention must be paid to the alignment of the corner holes to ensure accurate connection between the corner hole sleeves and the connecting pipes. After stacking, the entire plate assembly is uniformly compressed using a clamping device. The clamping force should be determined based on the characteristics of the gaskets and the design pressure, typically 0.8 to 1.2 MPa per square meter. Next, the inlet and outlet pipes are connected, with the hot and cold fluids entering and exiting through the corresponding corner holes. Threaded connections at the joints ensure reliable pipe connections. Before system operation, a pressure test is required. First, a low-pressure fluid is used to check for leaks; only after confirming no leakage should the pressure be gradually increased to the operating pressure. During operation, the fluid enters through the inlet side corner hole, is guided by the crescent-shaped guide plate, and is evenly distributed into the heat exchange area formed by the corrugated structure. It forms a spiral flow within the herringbone corrugated channels, facilitating thorough heat exchange with the fluid on the other side. The micro-protrusions on the surface enhance heat transfer, while the arc-shaped crests and troughs reduce flow resistance, ensuring a highly efficient heat transfer process. After heat exchange, the fluid flows out through the outlet side corner hole, completing a full heat exchange cycle. Routine maintenance requires periodic checks of the sealing gaskets; if aging or damage is found, they should be replaced promptly. The sealing performance of the corner hole assembly should also be checked to ensure long-term stable operation.

Claims

1. A heat exchange plate for a plate heat exchanger, characterized in that, include: The heat exchange plate comprises a heat exchange plate body, sealing gaskets, a flow guide plate, a corner hole assembly, a corrugated structure, and a connecting joint. The heat exchange plate body is a rectangular metal plate with corner holes at each of its four corners, and corner hole assemblies are installed at each corner hole. The corner hole assembly includes a corner hole sleeve and a sealing ring. The corner hole sleeve is fixedly installed on the inner wall of the corner hole, and the sealing ring surrounds the outer side of the corner hole sleeve. A sealing groove is formed around the periphery of the heat exchange plate body, and a sealing gasket made of rubber is embedded in the sealing groove. A corrugated structure is provided in the central area of ​​the heat exchange plate body. The corrugated structure is arranged in a herringbone pattern, with alternating peaks and troughs. A flow guide plate is provided on the liquid inlet side of the heat exchange plate body. The flow guide plate is fixedly connected to the inner surface of the heat exchange plate body by welding and has an arc-shaped structure. A connecting joint is provided on the liquid outlet side of the heat exchange plate body. The connecting joint is fixed to the corner hole sleeve of the corner hole assembly by threaded connection, and the inner diameter of the connecting joint is consistent with the inner diameter of the corner hole sleeve.

2. The heat exchange plate for a plate heat exchanger according to claim 1, characterized in that, The heat exchange plate is made of stainless steel with a thickness of 0.5 mm to 1.2 mm. The length of the heat exchange plate is 600 mm to 1200 mm and the width is 400 mm to 800 mm. The diameter of the corner holes is 50 mm to 100 mm, and the four corner holes are symmetrically distributed at the four corners of the heat exchange plate.

3. The heat exchange plate for a plate heat exchanger according to claim 2, characterized in that, The sealing gasket has a circular cross-section, and its outer diameter is 10% to 20% larger than the width of the sealing groove to generate pre-compression force. The distance between the inner edge of the sealing gasket and the effective heat exchange area of ​​the heat exchange plate is 20 mm to 40 mm, and the sealing gasket is fixed in the sealing groove by an adhesive.

4. A heat exchange plate for a plate heat exchanger according to claim 3, characterized in that, The corrugated structure has a peak height of 2 mm to 6 mm and a wave spacing of 8 mm to 15 mm; the herringbone angle of the corrugated structure is 60 degrees to 120 degrees, and the corrugated structure covers 80% to 95% of the central area of ​​the heat exchange plate; the corrugated structure is integrally formed on the heat exchange plate by a stamping process.

5. A heat exchange plate for a plate heat exchanger according to claim 4, characterized in that, The guide plate has a crescent-shaped structure with an arc radius of 80 mm to 150 mm and a thickness of 1 mm to 3 mm. The two ends of the guide plate are tangentially connected to the left and right side walls of the heat exchange plate, respectively, and the middle part of the guide plate protrudes into the inner side of the heat exchange plate to form a flow channel.

6. A heat exchange plate for a plate heat exchanger according to claim 5, characterized in that, The corner hole sleeve is made of brass, and the clearance between the outer diameter of the corner hole sleeve and the inner diameter of the corner hole is 0.1 mm to 0.3 mm. The sealing ring is made of polytetrafluoroethylene, and the thickness of the sealing ring is 2 mm to 4 mm. The sealing ring is assembled on the outside of the corner hole sleeve by interference fit.

7. A heat exchange plate for a plate heat exchanger according to claim 6, characterized in that, The surface of the heat exchange plate is provided with a plurality of micro-protrusions, the height of which is 0.1 mm to 0.5 mm, the micro-protrusions are evenly distributed on the surface of the heat exchange plate, and the spacing between the micro-protrusions is 5 mm to 10 mm.

8. A heat exchange plate for a plate heat exchanger according to claim 7, characterized in that, The crests of the corrugated structure are arc-shaped with a radius of 1 mm to 3 mm, and the troughs of the corrugated structure are also arc-shaped with a radius of 1.5 mm to 4 mm.

9. A heat exchange plate for a plate heat exchanger according to claim 8, characterized in that, The sealing groove has a trapezoidal cross-section, with a bottom width of 8 mm to 12 mm, a top opening width of 6 mm to 10 mm, and a depth of 3 mm to 5 mm.

10. A heat exchange plate for a plate heat exchanger according to claim 9, characterized in that, The outer surface of the connector is provided with multiple threaded grooves, the thread pitch of which is 1.5 mm to 2.5 mm, the depth of which is 0.8 mm to 1.5 mm, and the total length of the connector is 25 mm to 40 mm.

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