A detachable plate heat exchanger sealing gasket pressing device

Abstract

The utility model provides a detachable plate heat exchanger sealing gasket compression device belongs to detachable plate heat exchanger technical field, this detachable plate heat exchanger sealing gasket compression device includes compression main part, spacing block and locking lever, the compression main part is arc plate structure, the inner arc surface of compression main part even distribution has a plurality of convex rib along the arc length direction, the extension direction of convex rib is perpendicular to the arc length direction of compression main part, the both ends of compression main part respectively extend outward and form mounting lug, the mounting lug is equipped with the through -hole, spacing block is L shape structure, the short -side part of spacing block inserts the clamping groove in compression main part end, can solve the uneven tightness of current plate heat exchanger sealing gasket compression device in the process of using and lead to the technical problem of the local stress concentration of sealing gasket and the premature damage of producing.

Description

Technical Field

[0001] This utility model belongs to the technical field of detachable plate heat exchangers, specifically, it relates to a detachable plate heat exchanger gasket clamping device. Background Technology

[0002] Plate heat exchangers, as highly efficient and compact heat exchange devices, are widely used in industries such as petrochemicals, food processing, pharmaceuticals, and heating and cooling. Their working principle involves stacking multiple corrugated metal plates at certain intervals, forming flow channels between adjacent plates, where hot and cold fluids exchange heat. Gaskets are key components of plate heat exchangers, installed in the peripheral sealing grooves of each heat exchange plate to prevent the mixing of hot and cold fluids and leakage. The sealing performance of the gaskets directly affects the operating efficiency and safety of the plate heat exchanger. In existing technologies, to ensure a tight seal between the gasket and the sealing groove, a clamping device is typically used to apply pressure to the gasket. Common clamping devices include flat plate clamping, spring clamping, and bolt-fastening structures. Flat plate clamping uses a flat metal plate to evenly press the sealing gasket with multiple bolts. However, because the flat plate cannot fit well with the arc-shaped structure of the sealing groove, the clamping force is mainly concentrated in the area near the bolts, and the sealing gasket is not sufficiently compressed in the non-bolt areas, which can easily lead to leakage. Spring clamping uses the elastic deformation of the spring to generate continuous clamping force, but the spring is prone to creep and elastic decay under long-term high-temperature environment, resulting in a gradual decrease in clamping force, requiring frequent adjustment or replacement. Bolt fastening uses multiple bolts to fix the clamping components to the heat exchange plate. The clamping force depends on the tightening torque of the bolts. However, this method requires tightening each bolt one by one, and the installation and disassembly process is cumbersome and time-consuming. Especially in the case of frequent maintenance, the maintenance efficiency is low and the labor cost is high. Utility Model Content

[0003] In view of this, the present invention provides a detachable plate heat exchanger gasket clamping device, which can solve the technical problems of uneven clamping force distribution leading to local stress concentration of the gasket and premature damage during the use of existing plate heat exchanger gasket clamping devices, as well as the complex structure of existing clamping devices resulting in difficult installation and disassembly, low maintenance efficiency, and affecting the overall service life and maintenance cost of plate heat exchangers.

[0004] This utility model is implemented as follows:

[0005] This utility model provides a detachable plate heat exchanger gasket clamping device for clamping and fixing the gaskets of a plate heat exchanger. It includes a clamping body, a limiting block, and a locking rod. The clamping body has an arc-shaped plate structure, with several raised ribs evenly distributed along the arc length direction on its inner arc surface. The extending direction of the raised ribs is perpendicular to the arc length direction of the clamping body. Both ends of the clamping body extend outward to form mounting ears, and through holes are provided on the mounting ears. The limiting block has an L-shaped structure, with its short side embedded in a groove at the end of the clamping body, and its long side parallel to the outer arc surface of the clamping body. The locking rod is a cylindrical rod that passes sequentially through the through holes on the two mounting ears. Both ends of the locking rod have blocking portions with a diameter larger than the diameter of the through holes.

[0006] The technical advantages of the detachable plate heat exchanger gasket clamping device provided by this utility model are as follows: By setting an arc-shaped plate-shaped clamping body in conjunction with the raised rib structure on the inner arc surface, the clamping force is evenly distributed on the contact surface of the gasket, avoiding local stress concentration that could damage the gasket. At the same time, the arrangement of the raised ribs perpendicular to the arc length direction effectively increases the contact area with the gasket and improves the clamping stability. The L-shaped structure of the limiting block and the matching groove at the end of the clamping body can laterally limit the clamping body during the clamping process, preventing the clamping body from shifting. The structure of the locking rod passing through the mounting ear plate through hole and having blocking parts at both ends enables quick locking and disassembly of the entire clamping device, improving the efficiency of plate heat exchanger maintenance.

[0007] Based on the above technical solution, the detachable plate heat exchanger gasket clamping device of this utility model can be further improved as follows:

[0008] The cross-section of the raised rib is trapezoidal, and the width of the raised rib near the bottom of the inner arc surface of the pressing body is greater than the width of the top of the raised rib.

[0009] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: The raised rib adopts a trapezoidal cross-section design and makes the bottom width greater than the top width, forming a gradual structure from wide to narrow. This structure can generate a wedge effect when compressing the sealing gasket, so that the compressing force is gradually transmitted from the root of the raised rib to the top. This not only ensures the strength of the connection between the root of the raised rib and the compressing body, but also makes the top of the raised rib form a concentrated contact area, which can more effectively compress the local area of ​​the sealing gasket. At the same time, the trapezoidal structure enhances the bending strength of the raised rib, avoids deformation during the compression process, and ensures the reliability of long-term use.

[0010] Furthermore, the spacing between two adjacent raised ribs is 2 to 3 times the width of the bottom of the raised rib.

[0011] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: setting the spacing between adjacent raised ribs to 2 to 3 times the bottom width of the raised ribs creates a reasonable distribution density of raised ribs. This spacing design allows the sealing gasket to form a moderate deformation space between adjacent raised ribs. When the clamping body applies pressure to the sealing gasket, the gasket material undergoes appropriate plastic deformation in the area between the raised ribs, filling the minor unevenness of the sealing groove and improving the sealing effect. At the same time, this spacing design avoids the problem of reduced rigidity of the clamping body due to excessively dense raised ribs, and also avoids the defect of uneven clamping due to excessively sparse raised ribs, thus optimizing the distribution of clamping force.

[0012] Furthermore, the arc angle of the pressing body is 120° to 150°, and the radius of curvature of the inner arc surface of the pressing body matches the radius of curvature of the mounting groove of the plate heat exchanger gasket.

[0013] The beneficial effects of adopting the above-mentioned improved scheme are as follows: setting the arc angle of the clamping body within the range of 120° to 150° allows the clamping body to cover most of the circumferential area of ​​the plate heat exchanger gasket installation area, providing sufficient clamping contact area; at the same time, this angle range ensures both the clamping effect and provides sufficient operating space for the clamping body during installation and disassembly, avoiding assembly difficulties caused by excessive arc angle; the design of matching the curvature radius of the inner arc surface of the clamping body with the curvature radius of the gasket installation groove ensures that the clamping body and the gasket achieve surface contact rather than point or line contact, so that the clamping force is evenly transmitted to the gasket, avoiding stress concentration.

[0014] Furthermore, the shorter side of the limiting block is shorter than the longer side, and the shorter side of the limiting block is connected to the slot at the end of the pressing body in a sliding fit manner.

[0015] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the design of the limiting block having a shorter side length than the longer side length makes the limiting block exhibit a distinct L-shaped feature. After the shorter side part is embedded in the end slot of the pressing body, the longer side part can extend a longer distance along the outer arc surface of the pressing body, providing a wider range of lateral support for the pressing body; the sliding fit connection allows the limiting block to make slight axial adjustments within the slot, adapting to the installation size deviations of plate heat exchangers of different specifications. At the same time, the sliding fit structure facilitates the installation and disassembly of the limiting block, making it easy to operate when replacement or maintenance is required, reducing maintenance costs and time.

[0016] Furthermore, the depth of the slot is 1 to 2 times the thickness of the short side of the limiting block, and the slot extends along the arc length direction of the pressing body.

[0017] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: setting the groove depth to 1 to 2 times the thickness of the short side of the limiting block ensures that the short side of the limiting block has sufficient support depth after being embedded, providing a stable limiting effect, while avoiding the problems of the limiting block being difficult to embed due to the groove being too deep or the limiting being not secure due to the groove being too shallow; the design of the groove extending along the arc length direction of the pressing body allows the limiting block to move along the arc length direction within a certain range, making it easy to adjust the specific position of the limiting block and adapt to the requirements of the limiting position under different working conditions. At the same time, this extension design increases the contact length between the groove and the limiting block, disperses the stress during limiting, and improves the connection reliability.

[0018] Furthermore, the mounting ear plate is arranged perpendicularly to the end of the clamping body, and the axis of the through hole is parallel to the chord direction of the clamping body.

[0019] The beneficial effects of adopting the above-mentioned improved scheme are as follows: The mounting ear plate is set perpendicularly to the end of the clamping body, so that the mounting ear plate forms an outwardly protruding support structure, providing a stable support platform for the insertion of the locking rod. At the same time, the vertical setting makes the direction of the tensile force borne by the mounting ear plate consistent with the arc direction of the clamping body, which is conducive to effectively transferring the locking force to the clamping body. The design of the through hole axis being parallel to the chord direction of the clamping body makes the locking rod form a straight connection after passing through the two mounting ear plates. The tensile stress generated when the locking rod is under force is evenly distributed, avoiding the generation of bending moment, improving the strength and stability of the locking structure, and facilitating the installation and alignment of the locking rod.

[0020] Furthermore, the blocking part of the locking rod has a frustum-shaped structure, and the conical surface of the blocking part is arranged facing the outer side of the mounting ear plate. The blocking part is connected to the cylindrical rod body of the locking rod by a thread.

[0021] The beneficial effects of adopting the above-mentioned improved scheme are as follows: The locking rod blocking part adopts a frustum-shaped structure with the conical surface facing the outer side of the mounting ear plate. During the locking process, the conical surface of the frustum can form a wedge-shaped fit with the outer side of the mounting ear plate, generating a self-locking effect and preventing the locking rod from loosening under vibration or thermal expansion and contraction. The design of the blocking part and the cylindrical rod body of the locking rod being connected by threads makes the blocking part a movable part, which is convenient for adjusting the distance between the blocking part and the mounting ear plate and adapting to the pressing body of different thicknesses. At the same time, the threaded connection facilitates the disassembly and replacement of the blocking part. When the blocking part is worn, only the blocking part needs to be replaced instead of the entire locking rod, reducing maintenance costs.

[0022] Furthermore, the height of the raised rib is 2 to 4 times the thickness of the pressing body, and the top of the raised rib has a rounded surface structure.

[0023] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: setting the height of the raised rib to 2 to 4 times the thickness of the pressing body ensures that the raised rib has sufficient extension length to penetrate into the deformation area of ​​the sealing gasket and provide effective pressing. At the same time, this height range ensures that the raised rib has sufficient rigidity and is not prone to bending deformation when subjected to pressing force. The design of the top of the raised rib with a rounded surface structure avoids the sharp edge from cutting or damaging the sealing gasket. When the rounded surface contacts the sealing gasket, it can form a soft pressure distribution, which not only ensures the pressing effect but also extends the service life of the sealing gasket. In addition, the rounded surface structure is not easily worn during repeated installation and disassembly, maintaining long-term pressing performance.

[0024] Furthermore, the clamping body is made of stainless steel, the limiting block is made of polytetrafluoroethylene, and the locking rod is made of carbon structural steel.

[0025] The beneficial effects of adopting the above-mentioned improved scheme are as follows: Using stainless steel to manufacture the clamping body, leveraging the excellent corrosion resistance and mechanical strength of stainless steel, allows the clamping body to maintain stable mechanical properties over a long period in the high-temperature and high-pressure working environment of the plate heat exchanger, without reducing the clamping force due to corrosion; using polytetrafluoroethylene (PTFE) to manufacture the limiting block, utilizing the low coefficient of friction of this material, ensures low resistance when the limiting block slides within the slot, facilitating position adjustment. Simultaneously, the chemical corrosion resistance of PTFE guarantees the stability of the limiting block in various media environments; using carbon structural steel to manufacture the locking rod, utilizing the high strength and good machinability of this material, allows the locking rod to withstand significant tensile stress without plastic deformation, ensuring reliable locking.

[0026] Compared with existing technologies, the advantages of this utility model for a detachable plate heat exchanger gasket clamping device are as follows: This utility model achieves multi-point uniform clamping of the gasket by setting an arc-shaped clamping body in conjunction with several raised ribs evenly distributed along the arc length direction on the inner arc surface. This solves the problem of uneven clamping force distribution in existing technologies from a fundamental perspective. The arrangement of the raised ribs perpendicular to the arc length direction ensures that the clamping force is evenly distributed along the circumference of the gasket, avoiding local stress concentration. The L-shaped structure of the limiting block and the sliding fit of the end slot of the clamping body provide reliable lateral limiting while enabling fine-tuning of the position, adapting to the installation requirements of plate heat exchangers of different specifications. The structure of the locking rod passing through the mounting ear plate through hole and having detachable blocking parts at both ends simplifies the locking operation of the entire clamping device to the insertion of a single component. Compared to existing technologies that require multiple fasteners for fixing, this invention significantly improves installation and disassembly efficiency. The wedge-shaped effect created by the trapezoidal cross-section design of the raised ribs makes the transmission of clamping force more efficient, while the arc-shaped top structure avoids damage to the sealing gasket. By rationally setting the spacing between adjacent raised ribs and the arc angle of the clamping body, a balance between clamping effect and ease of operation is achieved. The use of different materials such as stainless steel, polytetrafluoroethylene, and carbon structural steel to manufacture various components fully utilizes the performance advantages of each material, achieving optimal coordination in terms of corrosion resistance, mechanical strength, and friction characteristics. Compared to existing clamping devices made of a single material, this invention has a longer service life and better overall performance, fundamentally solving the technical problems of uneven clamping and difficult maintenance of sealing gaskets in plate heat exchangers. Attached Figure Description

[0027] 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.

[0028] Figure 1 This is a schematic diagram of a detachable plate heat exchanger gasket clamping device.

[0029] Figure 2 This is a schematic diagram of the limit block structure;

[0030] Figure 3 This is a schematic diagram of the structure of the raised rib;

[0031] The attached diagram lists the components represented by each number as follows:

[0032] 10. Pressing body; 20. Limiting block; 30. Locking rod. Detailed Implementation

[0033] 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.

[0034] like Figure 1-3 The diagram shows a structural schematic of a detachable plate heat exchanger gasket clamping device provided by this utility model. The device is used to clamp and fix the gasket of the plate heat exchanger. It includes a clamping body 10, a limiting block 20, and a locking rod 30. The clamping body has an arc-shaped plate structure. Several raised ribs are evenly distributed along the arc length direction on the inner arc surface of the clamping body. The extension direction of the raised ribs is perpendicular to the arc length direction of the clamping body. Both ends of the clamping body extend outward to form mounting ears, and through holes are provided on the mounting ears. The limiting block has an L-shaped structure. The short side of the limiting block is embedded in the groove at the end of the clamping body, and the long side of the limiting block is parallel to the outer arc surface of the clamping body. The locking rod is a cylindrical rod that passes through the through holes on the two mounting ears in sequence. Both ends of the locking rod are provided with blocking parts, the diameter of which is larger than the diameter of the through hole.

[0035] In the above technical solution, the cross-section of the raised rib is trapezoidal, and the width of the raised rib near the bottom of the inner arc surface of the pressing body is greater than the width of the top of the raised rib.

[0036] Furthermore, in the above technical solution, the spacing between two adjacent raised ribs is 2 to 3 times the width of the bottom of the raised rib.

[0037] Furthermore, in the above technical solution, the arc angle of the pressing body is 120° to 150°, and the radius of curvature of the inner arc surface of the pressing body matches the radius of curvature of the mounting groove of the plate heat exchanger gasket.

[0038] Furthermore, in the above technical solution, the short side length of the limiting block is less than the long side length of the limiting block, and the short side of the limiting block is connected to the slot at the end of the pressing body by a sliding fit.

[0039] Furthermore, in the above technical solution, the depth of the card slot is 1 to 2 times the thickness of the short side of the limiting card block, and the card slot extends along the arc length direction of the pressing body.

[0040] Furthermore, in the above technical solution, the mounting ear plate is set perpendicular to the end of the pressing body, and the axis of the through hole is parallel to the chord direction of the pressing body.

[0041] Furthermore, in the above technical solution, the blocking part of the locking rod has a frustum-shaped structure, the conical surface of the blocking part is set facing the outer side of the mounting ear plate, and the blocking part is connected to the cylindrical rod body of the locking rod by a thread.

[0042] Furthermore, in the above technical solution, the height of the raised rib is 2 to 4 times the thickness of the pressing body, and the top of the raised rib has a rounded surface structure.

[0043] Furthermore, in the above technical solution, the clamping body is made of stainless steel, the limiting block is made of polytetrafluoroethylene, and the locking rod is made of carbon structural steel.

[0044] The following is a specific embodiment 1 of this utility model: In this embodiment, the pressing body is manufactured by stamping 304 stainless steel sheet. The thickness of the stainless steel sheet is 3mm. The arc angle of the pressing body is set to 135°, and the radius of curvature of the inner arc surface is 150mm, which matches the radius of curvature of the sealing groove of the DN200 plate heat exchanger. Eight raised ribs are evenly distributed along the arc length direction on the inner arc surface of the pressing body. The center distance between adjacent raised ribs is 28mm. The extension direction of the raised ribs is perpendicular to the arc length direction of the pressing body. The length of each raised rib is 45mm, which is equivalent to the width of the pressing body. The raised rib adopts a trapezoidal cross-section design, with a bottom width of 7mm, a top width of 3mm, and a height of 8mm, which is 2.7 times the thickness of the pressing body. The angle between the trapezoidal side and the bottom is 65°. The top of the raised rib is processed into an arc surface with a radius of curvature of 1.5mm, and the arc surface extends continuously along the length direction of the raised rib. Both ends of the clamping body extend outward to form mounting ear plates. These mounting ear plates are rectangular, 40mm long, 30mm wide, and 3mm thick, the same as the clamping body. A 10mm diameter through hole is formed at the geometric center of each mounting ear plate, with the axis of the through hole parallel to the chord direction of the clamping body. The axes of the through holes on both mounting ear plates are aligned. A retaining groove is machined on the outer arc surface at each end of the clamping body. The groove extends along the arc length, is 50mm long, 5mm deep, and 8mm wide, with a flat bottom and vertical sides. The limiting block is made of polytetrafluoroethylene (PTFE) and machined. It has an L-shaped structure with a short side length of 25mm, a thickness of 4mm, and a width of 8mm. The short side can fully embed into the groove at the end of the clamping body, with a 0.5mm clearance between the short side and the groove for sliding engagement. The long side of the limiting block is 80mm long, 4mm thick, and 8mm wide. After the clamping body is installed, the long side extends parallel to the outer arc surface of the clamping body, and the end of the long side is rounded with a radius of 2mm to avoid sharp corners. The locking rod is machined from 45# carbon structural steel. The main body of the locking rod is a cylindrical rod with a diameter of 9mm. Its length is determined by the arc length of the clamping body and the distance between the two mounting ears. In this embodiment, the total length of the locking rod is 380mm. The surface of the cylindrical rod is polished to a surface roughness of Ra0.8. The locking rod has a 15mm long threaded section at each end. The thread is a standard M10 coarse thread with a pitch of 1.5mm.The blocking part is manufactured from No. 45 carbon structural steel. It has a frustum-shaped structure with a large end diameter of 20mm, a small end diameter of 10mm, a height of 12mm, and a cone angle of 30°. An internal threaded hole with M10 standard coarse thread is machined at the center of the small end of the frustum, which mates with the threaded section at the end of the locking rod. The blocking part is connected to the locking rod by screwing in; a screw-in depth of 10mm ensures a secure connection. In this embodiment, the clamping device is used to clamp and fix the nitrile rubber sealing gasket of the plate heat exchanger. The nitrile rubber sealing gasket has a rectangular cross-section, a width of 12mm, a height of 6mm, and a Shore hardness of 70. During installation, the clamping body is aligned with the sealing groove where the gasket has been placed. The top of the arc surface of the raised rib first contacts the outer side of the gasket. As the tension of the locking rod increases, the raised rib gradually presses into the gasket. The gasket material undergoes moderate plastic deformation in the area between the raised ribs, filling the tiny gaps in the sealing groove. When the blocking part is tightened to a torque of 40kN, the gasket undergoes a compression deformation of about 1.5mm under the action of the raised rib. The clamping force is evenly distributed along the circumference of the gasket, achieving a reliable sealing effect. The clamping device in this embodiment weighs 0.8kg, has a compact structure, and takes about 5 minutes to install and about 3 minutes to disassemble, significantly reducing the operation time compared to traditional bolt tightening methods. The arc-shaped structure of the clamping body can adapt to the thermal expansion changes of the plate heat exchanger within the operating temperature range of -20℃ to 200℃. The trapezoidal cross-section design of the raised rib ensures that it maintains a stable geometric shape under long-term stress, without plastic deformation. The PTFE material of the limiting block has excellent chemical corrosion resistance, resisting the erosion of acids, alkalis, salts, and other chemicals in the heat exchange medium. Its low coefficient of friction keeps the sliding resistance of the limiting block within the slot low, facilitating position adjustment. The carbon structural steel material of the locking rod and blocking part, after tempering heat treatment, achieves a tensile strength of over 600 MPa and a yield strength of over 355 MPa, capable of withstanding the large tensile stress generated during the clamping process without permanent deformation. The self-locking effect generated by the frustum-shaped conical surface of the blocking part and the wedge-shaped fit of the outer side of the mounting ear plate ensures that the clamping device maintains a stable locking state even when subjected to vibration and impact during plate heat exchanger operation, preventing loosening and detachment. This embodiment of the clamping device, through reasonable structural design and material selection, achieves uniform clamping of the sealing gasket, effectively solving the problem of uneven clamping force distribution in traditional clamping devices, extending the service life of the sealing gasket, and reducing the maintenance frequency and cost of the plate heat exchanger.

[0045] The following is another specific embodiment 2 of this utility model: Embodiment 2 is based on Embodiment 1, but the shape of the raised rib is improved. The cross-section of the raised rib is changed from a trapezoidal structure to a semi-cylindrical structure. The bottom width of the raised rib is maintained at 7mm, the height of the raised rib is maintained at 8mm, the radius of the semi-cylindrical arc is 3.5mm, and the axis of the semi-cylindrical arc extends along the length of the raised rib. When this semi-cylindrical raised rib contacts the sealing gasket, the contact area is a continuous arc line. Compared with the arc surface at the top of the trapezoidal raised rib in Embodiment 1, the contact arc line of the semi-cylindrical raised rib is longer, and the contact area with the sealing gasket is larger, which can further disperse the compressive stress and reduce the stress concentration on the surface of the sealing gasket. The semi-cylindrical protrusion is machined using CNC milling. A ball end mill is used to continuously cut along the length of the protrusion to form a smooth semi-cylindrical surface. The surface roughness of the semi-cylindrical surface reaches Ra0.4 level. The smooth surface reduces friction with the sealing gasket, allowing the sealing gasket material to flow more easily along the surface of the protrusion during the clamping process, uniformly filling each area of ​​the sealing groove. In this embodiment, the structure, dimensions, and materials of other components are the same as in Embodiment 1. The improvement of the semi-cylindrical protrusion further enhances the service life and sealing reliability of the clamping device, making it particularly suitable for high-pressure plate heat exchanger applications with higher sealing performance requirements.

[0046] The following is another specific embodiment 3 of this utility model: Embodiment 3 improves upon Embodiment 1 by modifying the connection method between the limiting block and the pressing body. Bosses are machined on both sides of the short side of the limiting block. Each boss is cuboid in shape, with a length of 20mm, a width of 1.5mm, and a height of 1mm. The two bosses are symmetrically distributed at the middle of the two sides of the short side. Correspondingly, grooves that mate with the bosses are machined on the two side walls of the end slot of the pressing body. The dimensions of the grooves match the dimensions of the bosses, with a depth of 1.2mm, a width of 1.6mm, and a 0.1mm clearance. When the short side of the limiting block is inserted into the slot, the bosses on both sides of the short side embed into the grooves on the side walls of the slot, forming a snap-fit ​​connection. This snap-fit ​​structure provides a sliding adjustment function while increasing the connection strength between the limiting block and the pressing body, preventing the limiting block from dislodging from the slot when subjected to large lateral forces. The engagement between the boss and the groove employs a clearance fit. The limiting block can still slide and adjust its position along the arc length within the groove, but its movement perpendicular to the groove's extension direction is restricted by the boss and groove, effectively preventing accidental dislodgement. In this embodiment, the boss is machined using precision milling, and the groove is machined using wire cutting, ensuring the fitting accuracy between the boss and groove. The edges of both the boss and the groove are chamfered with a radius of 0.3mm to avoid stress concentration. This improvement in the embodiment enhances the structural reliability of the clamping device under impact or vibration loads, making it particularly suitable for plate heat exchanger applications in industrial environments with high vibration.

[0047] Specifically, the principle of this utility model is as follows: This utility model adopts an arc-shaped plate-like pressing body with an inner arc-shaped raised rib structure. Geometrically, this achieves a high degree of matching with the arc-shaped structure of the sealing groove of the plate heat exchanger. When the pressing body is installed in place, its inner arc surface can form a conformal contact with the outer arc surface of the sealing groove. The raised ribs, as the actual pressing contact points, are evenly distributed along the arc length direction of the pressing body, so that the pressing force is evenly distributed throughout the entire circumference of the sealing gasket, fundamentally eliminating the problem of concentrated pressing force. The design of the raised ribs extending perpendicular to the arc length direction makes each raised rib form a pressing line perpendicular to the circumference of the sealing gasket. These pressing lines are arranged at equal intervals along the circumference, forming a grid-like pressing force distribution pattern. Under this pressing force, the sealing gasket can evenly fill the sealing groove, achieving a reliable seal throughout the entire circumference. The raised ribs feature a trapezoidal cross-section design, with the bottom width greater than the top width. This wedge-shaped structure creates a wedge-like effect during clamping, transferring the clamping force from the wide bottom to the narrow top, forming a concentrated line contact pressure at the top. This concentrated pressure effectively overcomes the elastic modulus of the sealing gasket material, allowing it to undergo sufficient plastic deformation. Simultaneously, the trapezoidal raised ribs possess higher bending stiffness, preventing bending deformation during clamping. The L-shaped limiting block's short side embeds into the end groove of the clamping body, while the long side extends along the outer arc surface of the clamping body, forming a three-dimensional spatial limit on the clamping body. When the clamping body is subjected to the reaction force of the sealing gasket, the limiting block prevents radial and tangential displacement, ensuring the stability of the clamping position. The sliding fit design between the groove and the short side of the limiting block provides a small adjustment space, absorbing dimensional changes caused by manufacturing tolerances and thermal expansion. The locking rod passes through the through holes of the two mounting ears and is locked at both ends by the frustum-shaped blocking parts connected by threads. This structure connects all the components of the entire clamping device into a whole. The tension on the locking rod is transmitted to the clamping body through the mounting ears. The clamping body converts the tension into a clamping force acting on the sealing gasket, forming a complete force transmission path. The frustum-shaped conical surface of the blocking part and the wedge-shaped fit formed by the outer surface of the mounting ears produce a self-locking effect under tension, preventing loosening.

[0048] Before use, check that the raised ribs on the inner arc surface of the clamping body are intact and undamaged, confirm that the limiting block can slide smoothly in the slot, and check that the threaded connection of the locking rod and its two end stops is secure. Stack the heat exchange plates of the plate heat exchanger according to the design requirements, and place a sealing gasket in the sealing groove around the perimeter of each plate, ensuring that the sealing gasket fits tightly with the sealing groove without gaps. Select a clamping body that matches the radius of curvature of the sealing groove of the heat exchange plate, align the inner arc surface of the clamping body with the outer side of the sealing gasket, and align the raised ribs with the sealing gasket. Gently press the clamping body to initially position it. Insert the short side of the limiting block into the slot at the end of the clamping body, slide the limiting block to adjust its position, and maintain an appropriate gap between the long side of the limiting block and the edge of the heat exchange plate to ensure that the limiting block can provide effective lateral support to the clamping body. Insert the locking rod through the through hole of one side of the mounting ear plate, pass through the pressing body area, and finally exit through the through hole of the other side of the mounting ear plate. Screw the frustum-shaped blocking parts into both ends of the locking rod, ensuring the conical surfaces of the blocking parts face the outer side of the mounting ear plate. Gradually tighten the blocking parts at both ends, causing them to press against the mounting ear plate. The pulling force of the locking rod moves the pressing body inward, gradually pressing the protruding rib into the sealing gasket. Observe whether the sealing gasket deforms evenly. Once the protruding rib is in full contact with the sealing gasket, continue tightening the blocking parts to the specified torque to complete the installation of the pressing device. During use, periodically check whether the blocking parts are loose. If loosening is found, tighten them promptly. When the sealing gasket needs to be replaced, first loosen the blocking parts at both ends, pull the locking rod out of the through hole, remove the limit block, and move the pressing body outward to detach it from the sealing gasket. This allows for convenient replacement and maintenance of the sealing gasket.

Claims

1. A detachable plate heat exchanger gasket clamping device, used to clamp and fix the gasket of a plate heat exchanger, characterized in that, The device includes a clamping body, a limiting block, and a locking rod. The clamping body has an arc-shaped plate structure, with several raised ribs evenly distributed along the arc length direction on the inner arc surface of the clamping body. The extension direction of the raised ribs is perpendicular to the arc length direction of the clamping body. Both ends of the clamping body extend outward to form mounting ears, and the mounting ears have through holes. The limiting block has an L-shaped structure, with its short side embedded in a groove at the end of the clamping body, and its long side parallel to the outer arc surface of the clamping body. The locking rod is a cylindrical rod that passes through the through holes on the two mounting ears in sequence. Both ends of the locking rod have blocking parts with a diameter larger than the diameter of the through holes.

2. The removable plate heat exchanger gasket clamping device according to claim 1, characterized in that, The cross-section of the raised rib is trapezoidal, and the width of the raised rib near the bottom of the inner arc surface of the pressing body is greater than the width of the top of the raised rib.

3. The removable plate heat exchanger gasket clamping device according to claim 2, characterized in that, The spacing between two adjacent raised ribs is 2 to 3 times the width of the bottom of the raised rib.

4. The removable plate heat exchanger gasket clamping device according to claim 3, characterized in that, The arc angle of the pressing body is 120° to 150°, and the radius of curvature of the inner arc surface of the pressing body matches the radius of curvature of the mounting groove of the plate heat exchanger gasket.

5. A detachable plate heat exchanger gasket clamping device according to claim 4, characterized in that, The shorter side of the limiting block is shorter than the longer side, and the shorter side of the limiting block is connected to the slot at the end of the pressing body by a sliding fit.

6. A detachable plate heat exchanger gasket clamping device according to claim 5, characterized in that, The depth of the slot is 1 to 2 times the thickness of the short side of the limiting block, and the slot extends along the arc length direction of the pressing body.

7. A detachable plate heat exchanger gasket clamping device according to claim 6, characterized in that, The mounting ear plate is set perpendicular to the end of the clamping body, and the axis of the through hole is parallel to the chord direction of the clamping body.

8. A detachable plate heat exchanger gasket clamping device according to claim 7, characterized in that, The blocking part of the locking rod has a frustum-shaped structure, and the conical surface of the blocking part is arranged facing the outer side of the mounting ear plate. The blocking part is connected to the cylindrical rod body of the locking rod by a thread.

9. A detachable plate heat exchanger gasket clamping device according to claim 8, characterized in that, The height of the raised rib is 2 to 4 times the thickness of the pressing body, and the top of the raised rib has a rounded surface structure.

10. A detachable plate heat exchanger gasket clamping device according to claim 9, characterized in that, The clamping body is made of stainless steel, the limiting block is made of polytetrafluoroethylene, and the locking rod is made of carbon structural steel.

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