Sealing structure for plate heat exchanger

Abstract

The utility model discloses a sealing structure for a plate heat exchanger, which comprises a sealing assembly, a locking mechanism and pressing plates, and is characterized in that the pressing plates are arranged at the top and the bottom of the heat exchanger, a plurality of heat exchange sheets are arranged between the pressing plates, the sealing assembly is arranged between the pressing plates and the plurality of heat exchange sheets, and the locking mechanism is arranged on the pressing plates; a supporting layer is arranged in the sealing assembly, an annular boss is arranged on the top of the pressing plate, a groove is formed in the locking mechanism, and the groove is matched with the annular boss in a clamped mode. The sealing performance of the heat exchanger can be enhanced, and the sealing effect and the heat exchange effect are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchange, in particular to a sealing structure for a plate heat exchanger. Background Art

[0002] The interlayer heat exchanger is formed by a sandwich between two adjacent plates. The cold and hot fluids are separated by a solid wall (tube or plate) and do not mix. It involves the transfer and conversion of heat. The heat exchange is carried out through the interlayer to make the fluid temperature reach the specified index of the process to meet the needs of the process conditions. The gap between the two plates is usually connected by a pipe or a sealing gasket to form a closed environment that can loosely accommodate the flow and transfer of materials. It is suitable for high temperature, high pressure, high viscosity, and easy to scale fluids.

[0003] Most of the existing heat exchangers are composed of a top plate, several heat exchange fins, and a stacked bottom plate. The fastening components act on the top plate and the bottom plate to achieve the fastening connection of the plate-and-plate heat exchanger, so that the gaskets can be replaced quickly and conveniently on site. However, during transportation, the fastening components will be offset, which will cause the top plate and the bottom plate to be misaligned and fall off. During operation, a large temperature difference will be generated inside the heat exchange fins due to the combined action of high-temperature materials and cold fluids. In addition, the pressure and wear on the outside of the heat exchange fins will cause cracks in the heat exchange fins, which will lead to the risk of rupture and leakage.

[0004] Traditional gaskets used for sealing are prone to shifting and deviating from the sealing groove when the sealing gasket is connected to the plate, which reduces the sealing function of the gasket and causes leakage or even failure. Poor sealing performance will cause fluid leakage and internal leakage. It is subjected to pressure and temperature during operation and has poor corrosion resistance, which brings many obstacles to the use of the heat exchanger and seriously affects the performance of the plate heat exchanger. Utility Model Content

[0005] The purpose of the utility model is to solve the problems of poor heat exchange components and sealing effect of the existing heat exchangers, loose locking of fastening components, which leads to cracks and displacement of the heat exchanger, resulting in leakage of the heat exchanger and affecting the heat exchange effect. A sealing structure for a plate heat exchanger is provided to enhance the sealing performance of the heat exchanger, improve the sealing effect and heat exchange effect. The main concept is:

[0006] A sealing structure for a plate heat exchanger comprises a sealing assembly, a locking mechanism and a pressure plate, wherein the pressure plates are mounted on the top and bottom of the heat exchanger, a plurality of heat exchange fins are arranged between the pressure plates, a sealing assembly is arranged between the pressure plate and the plurality of heat exchange fins, and a locking mechanism is arranged on the pressure plate; a supporting layer is arranged inside the sealing assembly, an annular boss is arranged on the top of the pressure plate, a groove is arranged on the locking mechanism, and the groove is engaged with the annular boss. In this solution, an annular boss is provided on the clamping plate installed on the top and bottom surfaces of the plate heat exchanger, and a groove for clamping with the annular boss is provided on the locking mechanism for clamping on the outside of the heat exchanger. The annular boss on the clamping plate enables the locking mechanism to be positioned during installation and prevents the locking mechanism from falling off during movement or use of the heat exchanger due to the clamping action of the groove provided by the locking mechanism and the annular boss. In this solution, a sealing component with a supporting layer is also provided between the clamping plate and the heat exchanger plate, and between multiple heat exchanger plates. The supporting layer can not only tightly seal the heat exchanger under the condition of stacked installation, but also provide a reaction support force between the components used for extrusion sealing. The supporting layer also performs a shaping treatment on the sealing component itself, so that the sealing component will not deform to the side after being squeezed, resulting in displacement, thereby avoiding leakage of internal fluid of the heat exchanger caused by deformation and displacement of the sealing component, which affects the heat exchange effect.

[0007] Preferably, the sealing assembly is an annular sealing ring structure, and the sealing assembly is composed of a supporting layer, a sealing extrusion layer and an anti-corrosion layer. The supporting layer is arranged in the middle position of the sealing assembly, the sealing extrusion layer is coated on the outside of the supporting layer, and the sealing extrusion layer is coated on the outside of the anti-corrosion layer.

[0008] Preferably, the support layer is composed of a hard plate, and the hard plate is a stainless steel corrugated plate or an asbestos plate. Both the stainless steel corrugated plate and the asbestos plate have good high temperature resistance and pressure resistance, and can withstand high pressure and high temperature in the heat exchanger. The hard plate has high hardness and strength, and can withstand the pressure from the upper and lower end surfaces. It is also provided as a support layer in the sealing component and can also perform shaping treatment on the sealing component body.

[0009] Preferably, the sealing extrusion layer is soft silicone. The soft silicone as the sealing extrusion layer provides sealing for the heat exchanger, prevents liquid, gas or dust from leaking out from the joint part of the heat exchanger equipment, ensures the sealing effect, and prevents unnecessary leakage; and due to the processing error of the material between the multi-layer heat exchanger plates of the heat exchanger, the sealing extrusion layer can fill these gaps to achieve sealing compensation.

[0010] Preferably, the anti-corrosion layer is made of tetrafluoroethylene material. The tetrafluoroethylene material has the function of preventing corrosion, and the provision of the anti-corrosion layer improves the service life and pressure resistance of the mechanical sealing device.

[0011] Preferably, the sealing component is arranged at the periphery of the material flow layer inside the heat exchanger, and the material flow layer is the interlayer between the pressing plate and the heat exchange plate and the interlayer between multiple heat exchange plates. The sealing component is arranged at the periphery of the material flow layer so that the material used for heat exchange between the material flow layers will not leak during the heat exchange process with the heat exchange plate, thereby improving the overall sealing performance of the heat exchanger and improving the heat exchange effect.

[0012] Preferably, the clamping plate is divided into an upper sealing plate and a lower sealing plate, the annular boss of the clamping plate is arranged at the edge position, the annular boss of the upper sealing plate is arranged on the upper surface; the annular boss of the lower sealing plate is arranged on the lower surface, the upper sealing plate is arranged with a material inlet, the lower sealing plate is arranged with a material outlet, and the sides of the multiple heat exchanger plates between the clamping plates are arranged with fluid interfaces and connecting pipes. The clamping plates with annular bosses are installed at the top and bottom of the heat exchanger, so that the top and bottom of the heat exchanger are tightly positioned and connected.

[0013] Preferably, the locking mechanism is composed of an adjusting screw, an adjusting nut and a pressing platform, the two ends of the adjusting screw are respectively sleeved with an adjusting nut and a pressing platform, the adjusting nut is arranged on the outside of the pressing platform, a spring washer is arranged between the adjusting nut and the pressing platform, and the adjusting nut and the adjusting screw are movably connected through a thread. The adjusting screw is a double-headed screw, and a pressing platform for clamping with a pressing plate and an adjusting nut for locking the pressing platform are arranged at both ends, so that the locking mechanism can provide a better fastening connection for the top and bottom of the heat exchanger, and a spring washer is arranged on the adjusting nut and the pressing platform bracket to prevent the adjusting nut from loosening and causing the pressing platform to separate from the pressing plate and affect the sealing effect.

[0014] Preferably, the pressing platform is composed of a guide sleeve and a fastening pressing plate, the fastening pressing plate and the guide sleeve are fixedly connected by integral molding or welding, the length of the fastening pressing plate is greater than the diameter of the guide sleeve, and a groove is provided on the lower surface of the extended end of the fastening pressing plate.

[0015] Preferably, the inner width of the groove is greater than the outer diameter of the annular boss, and the annular boss and the groove are movably connected by clearance fit. The width of the groove is greater than the outer diameter of the annular boss, so that the groove of the pressing platform can be easily positioned with the annular boss to realize the clamping of the locking mechanism and the pressing plate, and the clearance fit between the annular boss and the groove prevents the locking mechanism from shaking with the heat exchanger during transportation and use.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] 1. By setting sealing components between the pressing plate and the heat exchanger and between adjacent heat exchanger plates, adjacent heat exchanger plates will no longer be squeezed and worn against each other, reducing the direct pressure on the heat exchanger plates due to the tightening of the locking mechanism, and avoiding damage and leakage of the heat exchanger plates due to large internal temperature difference and external pressure.

[0018] 2. By setting an annular boss on the upper surface side of the upper sealing plate of the clamping plate and the lower surface side of the lower sealing plate, the annular boss is engaged with the groove of the locking mechanism to achieve the fastening connection of the heat exchanger while avoiding the problem of dislocation and falling off of the upper sealing plate and the lower sealing plate during long-term pressure in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the utility model.

[0020] Figure 2 It is a partial enlarged view of the locking mechanism of the utility model when it is not locked.

[0021] Figure 3 It is a structural schematic diagram of the sealing component of the utility model.

[0022] Figure 4 This is a structural cross-sectional view of the sealing component of the utility model.

[0023] The reference numerals include: 1, heat exchanger; 11, heat exchange plate; 12, material removal layer; 2, sealing assembly; 21, support layer; 22, sealing extrusion layer; 23, anti-corrosion layer; 3, locking mechanism; 31, adjusting screw; 32, adjusting nut; 33, pressing platform; 331, guide sleeve; 332, fastening pressing plate; 333, groove; 34, spring washer; 4, pressing plate; 41, upper sealing plate; 42, lower sealing plate; 43, annular boss. DETAILED DESCRIPTION

[0024] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0025] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. The meaning of "several" is one or more, unless otherwise clearly and specifically defined.

[0027] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0028] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0029] Example 1

[0030] Basically as attached Figure 1 To Attachment Figure 4As shown, the present embodiment provides a sealing structure for a plate heat exchanger, comprising a sealing assembly 2, a locking mechanism 3 and a pressure plate 4, characterized in that the pressure plate 4 is installed at the top and bottom of the heat exchanger 1, a plurality of heat exchange plates 11 are arranged between the pressure plates 4, a sealing assembly 2 is arranged between the pressure plate 4 and the plurality of heat exchange plates 11, and a locking mechanism 3 is arranged on the pressure plate 4; a supporting layer 21 is arranged in the sealing assembly 2, an annular boss 43 is arranged on the top of the pressure plate 4, a groove 333 is arranged on the locking mechanism 3, and the groove 333 is snap-fitted with the annular boss 43. The pressing plate 4 installed on the top and bottom surfaces of the heat exchanger 1 is provided with an annular boss 43, and a groove 333 for clamping the annular boss 43 is provided on the locking mechanism 3 for clamping on the outside of the heat exchanger 1. The annular boss 43 on the pressing plate 4 enables the locking mechanism 3 to be positioned during installation and prevents the locking mechanism 3 from falling off during movement or use of the heat exchanger 1 under the clamping action of the groove 333 provided on the locking mechanism 3 and the annular boss 43; between the pressing plate 4 and the heat exchange plate 11, and multiple heat exchange plates A sealing component 2 with a supporting layer 21 is arranged between 11. The supporting layer 21 can not only tightly seal the heat exchanger 1 under the condition of stacking installation, but also the sealing component 2 with the supporting layer 21 provides a reaction supporting force between the components used for extrusion sealing, and the supporting layer performs shaping treatment on the sealing component itself. The sealing component 2 will not deform to the side after being squeezed, resulting in displacement, thereby avoiding leakage of internal fluid of the heat exchanger 1 caused by deformation and displacement of the sealing component 2, which affects the heat exchange effect.

[0031] Example 2

[0032] like Figure 3-Figure 4 As shown, the sealing component 2 of this embodiment is an annular sealing ring structure, and the sealing component 2 is composed of a supporting layer 21, a sealing extrusion layer 22 and an anti-corrosion layer 23. The supporting layer 21 is arranged in the middle position of the sealing component 2, the sealing extrusion layer 22 is coated on the outside of the supporting layer 21, and the sealing extrusion layer 22 is coated on the outside of the anti-corrosion layer 23.

[0033] The support layer 21 is composed of a hard plate, which is a stainless steel corrugated plate or an asbestos plate. The sealing extrusion layer 22 is a soft silica gel, and the anti-corrosion layer 23 is a polytetrafluoroethylene material.

[0034] The support layer 21 can also be made of a stainless steel corrugated plate and an asbestos plate and is simultaneously arranged as a hard layer inside the sealing component 2 to strengthen the supporting effect of the sealing component 2 .

[0035] Both the stainless steel corrugated plate and the asbestos plate have good high temperature resistance and pressure resistance, and can withstand high pressure and high temperature in the heat exchanger. The hard plate has high hardness and strength, and can receive the pressure from the upper and lower end surfaces. It is also set as a support layer 21 in the sealing component 2 and can also shape the body of the sealing component 2. Soft silicone acts as a sealing extrusion layer 22 to provide sealing for the heat exchanger 1, preventing liquid, gas or dust from leaking from the joint part of the heat exchanger equipment, ensuring the sealing effect, and preventing unnecessary leakage. Due to the processing error of the materials between the multi-layer heat exchange plates 11 of the heat exchanger 1, the sealing extrusion layer 22 can fill these gaps to achieve sealing compensation. The tetrafluoroethylene material has the function of preventing corrosion, and the setting of the anti-corrosion layer improves the service life and pressure resistance of the mechanical sealing device.

[0036] The annular sealing ring structure may be any structure of O-type, rectangle or rounded rectangle. In this embodiment, the O-type annular sealing ring may be selected to adjust the shape according to the rectangular heat exchange plate to form a structure matching the heat exchange plate structure.

[0037] The sealing assembly 2 of this embodiment is arranged at the peripheral position of the material flow layer 12 inside the heat exchanger 1, and the material flow layer 12 is the interlayer between the pressing plate 4 and the heat exchange fins 11 and the interlayer between the plurality of heat exchange fins 11. The sealing assembly is arranged at the peripheral position of the material flow layer so that the material used for heat exchange between the material flow layers will not leak during the heat exchange process with the heat exchange fins, thereby improving the overall sealing performance of the heat exchanger and improving the heat exchange effect.

[0038] Example 3

[0039] like Figure 1-Figure 2 As shown, the clamping plate 4 of this embodiment is divided into an upper sealing plate 41 and a lower sealing plate 42. The annular boss 43 of the clamping plate 4 is arranged at the edge position. The annular boss 43 of the upper sealing plate 41 is arranged on the upper surface; the annular boss 43 of the lower sealing plate 42 is arranged on the lower surface. The upper sealing plate 41 is provided with a material inlet, and the lower sealing plate 42 is provided with a material outlet. The sides of the multiple heat exchanger plates 11 between the clamping plates 4 are provided with fluid interfaces and connecting pipes. The clamping plates 33 provided with annular bosses 43 are installed at the top and bottom of the heat exchanger 1, so that the top and bottom installations of the heat exchanger 1 are tightly positioned and connected.

[0040] The locking mechanism 3 of this embodiment is composed of an adjusting screw 31, an adjusting nut 32 and a pressing platform 33. The adjusting nuts 32 and the pressing platform 33 are respectively sleeved at both ends of the adjusting screw 31. The adjusting nut 32 is arranged on the outside of the pressing platform 33. A spring washer 34 is arranged between the adjusting nut 32 and the pressing platform 33. The adjusting nut 32 is movably connected with the adjusting screw 31 through a thread. The adjusting screw 31 is a double-headed screw. Both ends of the adjusting screw 31 are provided with a pressing platform 33 for clamping with the pressing plate 4 and an adjusting nut 32 for locking the pressing platform 33, so that the locking mechanism 3 can provide a better fastening connection for the top and bottom of the heat exchanger 1, and a spring washer 34 is arranged between the adjusting nut 32 and the pressing platform 33 bracket to prevent the adjusting nut 32 from loosening and causing the pressing platform 33 to separate from the pressing plate 4 and affect the sealing effect.

[0041] The clamping platform 33 is composed of a guide sleeve 331 and a fastening pressing plate 332. The fastening pressing plate 332 is fixedly connected to the guide sleeve 331 by integral molding or welding. The length of the fastening pressing plate 332 is greater than the diameter of the guide sleeve 331. A groove 333 is provided on the lower surface of the extended end of the fastening pressing plate 332. The inner width of the groove 333 is greater than the outer diameter of the annular boss 43. The annular boss 43 and the groove 333 are movably engaged by clearance fit. The width of the groove 333 is greater than the outer diameter width of the annular boss 43, so that the groove of the clamping platform can be easily positioned with the annular boss 43 to realize the engagement of the locking mechanism 3 with the clamping plate 4. The clearance fit between the annular boss 43 and the groove 333 is always in contact, so that the locking mechanism 3 will not shake with the heat exchanger 1 during transportation and use.

[0042] Among them, the length of the fastening pressing piece 332 of the pressing platform 33 is greater than the diameter of the guide sleeve 331 in order to reserve a processing position for the groove 333 on the lower surface of the fastening pressing piece 332, and the extension length of the fastening pressing piece 332 does not exceed the diameter length of the guide sleeve 331 in order to improve the strength of the fastening pressing piece 332 to avoid the fastening pressing piece 332 from breaking or deforming during the pressing process of the locking mechanism 3, thereby affecting the pressing effect on the pressing plate 4. In addition, the guide sleeve 331 is arranged at the lower end of the fastening pressing piece 332 to guide and adjust the pressing platform 33 on the adjusting screw 31, and to provide support and positioning for the fastening pressing piece 332. Since the guide sleeve 331 can not only perform linear motion but also rotate on the adjusting screw 31, a groove 333 is provided on the lower end surface of the fastening pressure plate 332 to clamp with the annular boss 43 of the clamping plate 4 so that the annular boss 43 constrains the circumferential rotation of the clamping platform 33 to avoid falling off between the locking mechanism 2 and the clamping plate 4.

[0043] The height of the sealing component 2 matches the height of the material flow layer 12 set for the heat exchanger 1. The sealing component 2 is set in the material flow layer 12 of the heat exchanger 1 and is locked and connected through the clamping plate 4 and the locking mechanism 3. In order to make the sealing component 2 in the heat exchanger 1 evenly stressed, the locking mechanism 3 is evenly and symmetrically arranged on the outside of the heat exchanger 1 to prevent excessive local pressure from causing the sealing component 2 to move or crack.

[0044] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0045] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A sealing structure for a plate heat exchanger, comprising a sealing assembly (2), a locking mechanism (3) and a pressing plate (4), characterized in that: The pressing plates (4) are mounted on the top and bottom of the heat exchanger (1); a plurality of heat exchange fins (11) are arranged between the pressing plates (4); a sealing assembly (2) is arranged between the pressing plates (4) and the plurality of heat exchange fins (11); and a locking mechanism (3) is arranged on the pressing plates (4); a supporting layer (21) is arranged inside the sealing assembly (2); an annular boss (43) is arranged on the top of the pressing plates (4); a groove (333) is arranged on the locking mechanism (3); and the groove (333) is engaged with the annular boss (43).

2. A sealing structure for a plate heat exchanger according to claim 1, characterized in that: The sealing component (2) is an annular sealing ring structure. The sealing component (2) is composed of a support layer (21), a sealing extrusion layer (22) and an anti-corrosion layer (23). The support layer (21) is arranged in the middle of the sealing component (2). The support layer (21) is externally coated with the sealing extrusion layer (22). The sealing extrusion layer (22) is externally coated with the anti-corrosion layer (23).

3. A sealing structure for a plate heat exchanger according to claim 2, characterized in that: The support layer (21) is composed of a hard plate, and the hard plate is a stainless steel corrugated plate or an asbestos plate.

4. A sealing structure for a plate heat exchanger according to claim 2, characterized in that: The sealing extrusion layer (22) is made of soft silicone.

5. The sealing structure for a plate heat exchanger according to claim 2, characterized in that: The anti-corrosion layer (23) is made of polytetrafluoroethylene material.

6. The sealing structure for a plate heat exchanger according to claim 1, characterized in that: The sealing component (2) is arranged at a peripheral position of a material flow layer (12) inside the heat exchanger (1), and the material flow layer (12) is an interlayer between the pressing plate (4) and the heat exchange plate (11) and an interlayer between a plurality of heat exchange plates (11).

7. The sealing structure for a plate heat exchanger according to claim 1, characterized in that: The clamping plate (4) is divided into an upper sealing plate (41) and a lower sealing plate (42); the annular boss (43) of the clamping plate (4) is arranged at an edge position; the annular boss (43) of the upper sealing plate (41) is arranged on an upper surface; the annular boss (43) of the lower sealing plate (42) is arranged on a lower surface; the upper sealing plate (41) is provided with a material inlet, and the lower sealing plate (42) is provided with a material outlet; and the sides of the plurality of heat exchange plates (11) between the clamping plates (4) are provided with fluid interfaces and connecting pipes.

8. The sealing structure for a plate heat exchanger according to claim 1, characterized in that: The locking mechanism (3) is composed of an adjusting screw (31), an adjusting nut (32) and a pressing platform (33). The adjusting nuts (32) and the pressing platform (33) are respectively sleeved on both ends of the adjusting screw (31). The adjusting nut (32) is arranged on the outside of the pressing platform (33). A spring washer (34) is arranged between the adjusting nut (32) and the pressing platform (33). The adjusting nut (32) and the adjusting screw (31) are movably connected via threads.

9. A sealing structure for a plate heat exchanger according to claim 8, characterized in that: The pressing platform (33) is composed of a guide sleeve (331) and a fastening pressing sheet (332). The fastening pressing sheet (332) and the guide sleeve (331) are fixedly connected by integral molding or welding. The length of the fastening pressing sheet (332) is greater than the diameter of the guide sleeve (331). A groove (333) is provided on the lower surface of the extended end of the fastening pressing sheet (332).

10. A sealing structure for a plate heat exchanger according to claim 9, characterized in that: The inner width of the groove (333) is greater than the outer diameter of the annular boss (43), and the annular boss (43) and the groove (333) are movably engaged through clearance fit.

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