Cover plate assembly and heat exchanger

Abstract

The utility model provides a cover plate assembly and a heat exchanger, the heat exchanger comprises a frame and a core plate bundle, and the frame comprises a pressing plate, a stand column and the cover plate assembly; the core plate bundle comprises a bearing plate and a bushing, the edge of the bushing is provided with a first folding edge, the edge of the bearing plate is provided with a second folding edge, and the first folding edge and the second folding edge form a sealing surface; the cover plate assembly comprises a base plate used for being connected with the pressing plate and the stand column, a circle of first blocking table is arranged on the periphery of the base plate, and receding grooves are formed in the corners of the first blocking table; a lining plate is arranged in the middle of the base plate, the edge of the lining plate abuts against the first blocking table, and the groove bottom of the receding groove is higher than the top of the lining plate. An L-shaped second blocking table is arranged at the corner of the lining plate, the first blocking table, the lining plate, the receding groove and the second blocking table form a containing groove, a circle of matched sealing gasket is arranged in the containing groove, and the sealing gasket is used for abutting against the sealing face. The cover plate assembly and the heat exchanger are simple in structure, convenient to manufacture, low in cost, good in sealing effect and long in service life.

Description

Technical Field

[0001] The present application relates to the field of heat exchange technology, and in particular to a cover plate assembly and a heat exchanger. Background Art

[0002] Plate and frame heat exchangers are mainly composed of parts such as columns, upper and lower pressure plates, cover plate assemblies, and core plate bundles. The core plate bundles are formed by welding between plate pairs and are suitable for use under higher temperature and high pressure conditions. Compared with detachable plate heat exchangers, plate and frame heat exchangers have the advantages of flexible process combinations, higher safety, and compact structure. They are widely used in petrochemical, mechanical power, shipbuilding, electricity, food and many other industrial productions.

[0003] For existing plate-and-frame heat exchangers, the sealing surface support structure on each side typically consists of a square structure consisting of two left and right columns and two upper and lower compression plates. This often leads to gaps and manufacturing errors at the corners where the columns and compression plates meet. Furthermore, the different bolt distribution structures at each corner result in inconsistent compression forces and uneven gasket compression. These gaps, errors, and uneven forces make corners prone to leaks and can even cause the gasket to fail due to overcompression, impacting the long-term safety of the heat exchanger.

[0004] In a heat exchanger, the cover plate assembly is used to compress the sealing gasket to seal the sealing surface. Existing cover plate assemblies typically only provide local external constraints on the sealing gasket during compression and sealing, with no internal constraints. Furthermore, the corner sealing gaskets are also unconstrained externally, resulting in insufficient compression force in the corner area, uneven gasket compression, and an inability to prevent localized leakage in the corners. In some technologies, the cover plate assembly is constructed of an integrally lined thickened stainless steel plate, which is then slotted. This results in high material and processing costs, and the full set of constraints requires a higher compression torque. Replacing and cleaning the sealing gasket is also more time-consuming and labor-intensive, and still fails to effectively resolve the issue of leaks in the corners. Therefore, there is an urgent need for a cover plate assembly that can improve sealing performance. Utility Model Content

[0005] In view of this, the purpose of this application is to propose a cover plate assembly and a heat exchanger to solve the related problems mentioned in the background technology.

[0006] In a first aspect of the present application, a cover plate assembly is provided for a heat exchanger, wherein the heat exchanger includes a frame and a core plate bundle arranged in the frame, the frame includes a clamping plate, a column and the cover plate assembly; the top and bottom of the core plate bundle are respectively provided with pressure plates, the pressure plate is provided with the clamping plate on the side away from the core plate bundle, the side corners of the core plate bundle are provided with bushings, the columns are provided in the bushings, the vertical edge of the bushings is provided with a first folded edge, the horizontal edge of the pressure plate is provided with a second folded edge, the ends of the first folded edge and the second folded edge are abutted to form a sealing surface, and the cover plate assembly and the sealing The cover is abutted against the cover; the cover assembly includes: a base plate, which is used to connect with the clamping plate and the column, and a circle of first stops is provided on the outer periphery of the base plate, and avoidance grooves extending along the first folding edge are provided at the corners of the first stops; a lining plate is provided in the middle of the base plate, and the edge of the lining plate abuts against the first stop, and the bottom height of the avoidance groove is higher than the top height of the lining plate; an L-shaped second stop is provided at the corners of the lining plate, and the first stop, the lining plate, the avoidance groove and the second stop form a receiving groove, and a circle of matching sealing gaskets is provided in the receiving groove, and the sealing gasket is used to abut against the sealing surface.

[0007] Furthermore, the distance between the bottom of the avoidance groove and the top of the lining plate is less than or equal to half the thickness of the sealing gasket, and the thickness of the second stop is less than or equal to half the thickness of the sealing gasket.

[0008] Furthermore, the area between two adjacent corners on the sealing gasket is a middle area, and the width of the sealing gasket at the corners is smaller than the width of the sealing gasket in the middle area.

[0009] Furthermore, the second stop includes two vertically connected branches, and a transition portion is provided at one end of the branch away from the corner. The distance between the side of the transition portion close to the first stop and the first stop is a first distance, and the first distance gradually increases in the direction away from the corner of the accommodating groove.

[0010] Furthermore, the sealing gasket is provided with a transition area between the corners and the middle area, and the sealing gasket in the transition area cooperates with the transition portion.

[0011] Furthermore, an angle between a side of the transition portion close to the first stop and a side of the branch portion close to the first stop is 165° to 175°.

[0012] Furthermore, a plurality of bolt holes are provided at intervals on the first baffle, and the bolt holes are used to connect with the pressing plate and the column, and the length of the branch is 0.5 times to 1 times the distance between two adjacent bolt holes.

[0013] Furthermore, the base plate is rectangular in shape and has two diagonals, and the plate body is provided with an avoidance angle at a corner along one of the diagonals.

[0014] Furthermore, the distance between the second stop close to the avoidance angle and the first stop is a second distance, and the distance between the second stop and the first stop away from the avoidance angle is a third distance, and the second distance is smaller than the third distance.

[0015] According to a second aspect of the present application, a heat exchanger is provided, comprising a frame and a core plate bundle arranged in the frame, wherein the frame comprises a compression plate, a column and the cover plate assembly as described in the first aspect above, the top and bottom of the core plate bundle are respectively provided with pressure plates, the pressure plate is provided on the side of the pressure plate away from the core plate bundle, a bushing is provided at the side corner of the core plate bundle, the column is provided in the bushing, the vertical edge of the bushing is provided with a first folded edge, the horizontal edge of the pressure plate is provided with a second folded edge, the ends of the first folded edge and the second folded edge are abutted against each other to form a sealing surface, the cover plate assembly abuts against the sealing surface, and is detachably connected to the compression plate and the column.

[0016] From the above description, it can be seen that the cover plate assembly and heat exchanger provided by the present application, the heat exchanger includes a frame and a core plate bundle arranged in the frame, the frame includes a pressure plate, a column and a cover plate assembly; the top and bottom of the core plate bundle are respectively provided with a pressure plate, the pressure plate is provided with a pressure plate on the side away from the core plate bundle, the side corners of the core plate bundle are provided with a bushing, a column is provided in the bushing, the vertical edge of the bushing is provided with a first folded edge, the horizontal edge of the pressure plate is provided with a second folded edge, the ends of the first folded edge and the second folded edge are abutted to form a sealing surface, and the cover plate assembly and the sealing surface are abutted; the cover plate assembly includes a base plate for connecting with the pressure plate and the column, the outer periphery of the base plate is provided with a circle of first stop platform, and the corners of the first stop platform are provided with avoidance grooves extending along the first folded edge or the second folded edge; the middle part of the base plate is provided with a lining plate, The edge of the lining plate is against the first stop, and the bottom height of the avoidance groove is higher than the top height of the lining plate; an L-shaped second stop is provided at the corner of the lining plate, and the first stop, the lining plate, the avoidance groove and the second stop form a receiving groove, and a circle of matching sealing gaskets is provided in the receiving groove, and the sealing gasket is used to resist the sealing surface; the outside of the sealing gasket is limited by arranging the first stop on the base plate, and the inside and outside of the sealing gasket are constrained at the corners by arranging the second stop and the limiting groove, so as to ensure the compression force of the sealing gasket at the corners, improve the sealing effect at the corners, and thus balance the overall sealing effect of the cover assembly; the cover assembly and the heat exchanger have simple structure, easy production, low cost, are not prone to leakage at the corners of the sealing surface, have good sealing effect and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in this application or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are merely embodiments of this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0018] Figure 1 This is a schematic diagram of the three-dimensional structure of a heat exchanger in an embodiment of the present application;

[0019] Figure 2 for Figure 1 Schematic diagram of the explosion structure of the heat exchanger;

[0020] Figure 3 Schematic diagram of the three-dimensional structure of the core plate bundle;

[0021] Figure 4 It is a structural schematic diagram of a substrate and a lining plate;

[0022] Figure 5 for Figure 4 Schematic diagram of the enlarged structure at A in the middle;

[0023] Figure 6 Schematic diagram of the structure of a sealing gasket;

[0024] Figure 7 This is a structural diagram of a cover plate assembly in an embodiment of the present application;

[0025] Figure 8 for Figure 7 Schematic diagram of the local cross section in the middle BB direction;

[0026] Figure 9 for Figure 7 Exploded view of the cover assembly.

[0027] Figure markings: 1. core plate bundle; 2. pressure plate; 2-1. second folding edge; 3. bushing; 3-1. first folding edge; 4. column; 5. clamping plate; 6. cover plate assembly; 7. base plate; 7-1. first stop; 7-2. avoidance groove; 7-3. bolt hole; 7-4. avoidance angle; 8. lining plate; 9. second stop; 9-1. branch; 9-2. transition part; 10. sealing gasket. DETAILED DESCRIPTION

[0028] In order to make the objectives, technical solutions and advantages of this application more clear, this application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0029] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should have the usual meanings understood by people with ordinary skills in the field to which this application belongs. The "first", "second" and similar words used in the embodiments of the present application do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0030] Plate and frame heat exchangers are mainly composed of parts such as columns, upper and lower pressure plates, cover plate assemblies, and core plate bundles. The core plate bundles are formed by welding between plate pairs and are suitable for use under higher temperature and high pressure conditions. Compared with detachable plate heat exchangers, plate and frame heat exchangers have the advantages of flexible process combinations, higher safety, and compact structure. They are widely used in petrochemical, mechanical power, shipbuilding, electricity, food and many other industrial productions.

[0031] For existing plate-and-frame heat exchangers, the sealing surface support structure on each side typically consists of a square structure consisting of two left and right columns and two upper and lower compression plates. This often leads to gaps and manufacturing errors at the corners where the columns and compression plates meet. Furthermore, the different bolt distribution structures at each corner result in inconsistent compression forces and uneven gasket compression. These gaps, errors, and uneven forces make corners prone to leaks and can even cause the gasket to fail due to overcompression, impacting the long-term safety of the heat exchanger.

[0032] In a heat exchanger, the cover plate assembly is used to compress the sealing gasket to seal the sealing surface. Existing cover plate assemblies typically only provide local external constraints on the sealing gasket during compression and sealing, with no internal constraints. Furthermore, the corner sealing gaskets are also unconstrained externally, resulting in insufficient compression force in the corner area, uneven gasket compression, and an inability to prevent localized leakage in the corners. In some technologies, the cover plate assembly is constructed of an integrally lined thickened stainless steel plate, which is then slotted. This results in high material and processing costs, and the full set of constraints requires a higher compression torque. Replacing and cleaning the sealing gasket is also more time-consuming and labor-intensive, and still fails to effectively resolve the issue of leaks in the corners. Therefore, there is an urgent need for a cover plate assembly that can improve sealing performance.

[0033] The following is a specific embodiment and combined with Figures 1 to 9 To describe the technical solution of this application in detail.

[0034] In some embodiments of the present application, a cover plate assembly 6 is provided, which is applied to a heat exchanger, such as Figures 1 to 3 As shown, the heat exchanger includes a frame and a core plate bundle 1 arranged in the frame, and the frame includes a clamping plate 5, a column 4 and the cover plate assembly 6; the top and bottom of the core plate bundle 1 are respectively provided with a pressure plate 2, and the pressure plate 2 is provided with the clamping plate 5 on the side away from the core plate bundle 1, and the side corner of the core plate bundle 1 is provided with a bushing 3, and the column 4 is provided in the bushing 3. The vertical edge of the bushing 3 is provided with a first folded edge 3-1, and the horizontal edge of the pressure plate 2 is provided with a second folded edge 2-1. The ends of the first folded edge 3-1 and the second folded edge 2-1 are abutted against each other to form a sealing surface, and the cover plate assembly 6 is abutted against the sealing surface; as shown Figure 4 、 Figure 9 and Figure 7 As shown, the cover plate assembly 6 includes: a base plate 7, which is used to connect with the clamping plate 5 and the column 4, and a circle of first stoppers 7-1 is provided on the outer periphery of the base plate 7, and the corners of the first stoppers 7-1 are provided with avoidance grooves 7-2 extending along the first folding edge 3-1; a lining plate 8 is provided in the middle of the base plate 7, and the edge of the lining plate 8 is abutted against the first stopper 7-1, and the bottom height of the avoidance groove 7-2 is higher than the height of the lining plate 8; an L-shaped second stopper 9 is provided at the corners of the lining plate 8, and the first stopper 7-1, the lining plate 8, the avoidance groove 7-2 and the second stopper 9 form a receiving groove, and a circle of matching sealing gaskets 10 are provided in the receiving groove, and the sealing gasket 10 is used to abut against the sealing surface.

[0035] like Figure 1 and Figure 2 As shown, the heat exchanger includes a frame and a core plate bundle 1, the frame includes a compression plate 5, a column 4 and a cover plate assembly 6, the core plate bundle 1 is used for fluid heat exchange; the top and bottom of the core plate bundle 1 are respectively provided with a pressure plate 2, the pressure plate 2 is used to protect the compression plate 5, to prevent fluid leakage and corrosion of the compression plate 5; the side corners of the core plate bundle 1 are provided with a bushing 3, the bushing 3 is used to protect the column 4, to prevent fluid leakage and corrosion of the column 4; the bushing 3 is located between the two pressure plates 2, as shown Figure 3 As shown, the vertical edge of the bushing 3 is provided with a first folded edge 3-1, and the horizontal edge of the pressure plate 2 is provided with a second folded edge 2-1. The ends of the first folded edge 3-1 and the second folded edge 2-1 are abutted against each other to form a rectangular sealing surface that cooperates with the cover plate assembly 6.

[0036] like Figure 9As shown, the cover assembly 6 includes a rectangular base plate 7, which corresponds to the side of the frame and can be bolted to the clamping plate 5 and the column 4; a circle of first stoppers 7-1 is provided on the outer periphery of the base plate 7, and avoidance grooves 7-2 extending along the first folding edge 3-1 are provided at the corners of the first stopper 7-1 to facilitate cooperation with the protrusion of the column 4; a lining plate 8 is provided in the middle of the base plate 7, and the base plate 7 and the lining plate 8 are fixed by assembly welding, and the edge of the lining plate 8 is against the first stopper 7-1, as shown in FIG. Figure 8 As shown, the bottom height of the avoidance groove 7-2 is higher than the top height of the liner 8, which can block the sealing gasket 10; Figure 4 As shown, an L-shaped second stopper 9 is provided at the corner of the lining plate 8, and the second stopper 9 is welded and fixed to the lining plate 8. The first stopper 7-1, the lining plate 8, the avoidance groove 7-2 and the second stopper 9 form a receiving groove, as shown in FIG. Figure 7 As shown, a ring of matching sealing gaskets 10 is provided within the receiving groove, and the sealing gaskets 10 are against the sealing surface. By providing a first stop 7-1 on the base plate 7 to limit the outside of the sealing gasket 10, and by providing a second stop 9 and a limiting groove, the inner and outer sides of the sealing gasket 10 can be constrained at the corners, ensuring the compression force of the sealing gasket 10 at the corners, improving the sealing effect at the corners, and thus balancing the overall sealing effect of the cover assembly 6. The L-shaped second stop 9 can play a role in positioning and fixing the sealing gasket 10 during installation, preventing the sealing gasket 10 from being installed misaligned and affecting the uniform compression of different edges.

[0037] The design of the second stop 9 is simpler than the design of integrally grooving the liner 8, and has a better sealing effect. The disadvantages of integral grooving are: first, the liner 8 must be thickened before it can be grooved, and the material of the liner 8 is stainless steel or more expensive special materials, which will significantly increase the material cost; second, the liner 8 needs to be processed separately, resulting in secondary processing of the cover assembly 6 after welding, which will also increase the cost; third, the increased clamping force of the straight edge that is not easy to leak will hinder the continued compression of the sealing gasket 10 at the corners, so that the corners that are prone to leakage cannot be compensated; at the same time, the integral grooving has a greater constraint force on the inside and outside of the sealing gasket 10, which will also make disassembly and assembly difficult; and the integral grooving requires bolts with larger torque. For example, when only the first stop 7-1 is set, the tightening torque required is 3000N·m, and the torque required after the liner 8 is integrally grooved is 5000N·m. After the second stop 9 is set in this embodiment, no torque does need to be increased, and it can also play a role in local pressure compensation.

[0038] This embodiment mainly adds internal and external constraint designs in the corner areas that are most unfavorable for assembly, manufacturing and pressing, that is, the areas where leakage is most likely to occur in the plate and frame heat exchanger. The contact area between the sealing gasket 10 and the liner 8 at the corners is fixed, while in the middle area, because there is no limiting structure on the inside, the contact area between the sealing gasket 10 and the liner 8 will increase with the extrusion, so that under the same bolt tightening action, the pressing force on the corners is greater and the sealing effect is stronger. At the same time, the internal constraint structure plays a role in positioning the sealing gasket 10, which facilitates assembly.

[0039] The cover plate assembly 6 has a simple structure, is easy to manufacture, and is low in cost. It is less likely to leak at the corners of the sealing surface, resulting in excellent sealing and a long service life. The cover plate assembly 6 increases the sealing pressure at the corners of the plate-and-frame heat exchanger, making the product more stable and safer. It also simplifies and improves the precision of the assembly of the sealing gasket 10. Furthermore, it effectively reduces the problem of insufficient or over-compression at the corners of the sealing gasket 10, thereby extending the product's service life.

[0040] In some embodiments, as Figure 8 As shown, the distance between the bottom of the avoidance groove 7 - 2 and the top of the lining plate 8 is less than or equal to half the thickness of the sealing gasket 10 , and the thickness of the second stop 9 is less than or equal to half the thickness of the sealing gasket 10 .

[0041] like Figure 8 As shown, the distance between the bottom of the avoidance groove 7-2 and the top of the lining plate 8 is d1, the thickness of the sealing gasket 10 is d2, and the thickness of the second stop 9 is d3. It is set that d1≤0.5d2, d3≤0.5d2 to ensure that the compression of the sealing gasket 10 is less than or equal to 50%, avoid over-compression of the sealing gasket 10, and avoid rigid contact between the base plate 7 and components such as the column 4 and the bushing 3.

[0042] In some embodiments, as Figure 6 As shown, the area between two adjacent corners of the sealing gasket 10 is the middle area, and the width of the sealing gasket 10 at the corners is smaller than the width of the sealing gasket 10 in the middle area.

[0043] like Figure 6As shown in the figure, area a is the corner, and area b is the middle area. The width of the sealing gasket 10 at the corner is set to be smaller than the width in the middle area. In this way, the contact area between the sealing gasket 10 and the sealing surface at the corner is smaller, so that under the same bolt compression force, the unit pressure at the corner can be greater; at the same time, combined with the internal and external constraint stops at the corner, the sealing gasket 10 at the corner will have flow obstruction during the compression process, and its compression force will be greater. At this time, the sealing gasket 10 at the corner can also be effectively compressed without increasing the corner bolt compression force; under the action of internal and external constraints, the normal pressure of the corner sealing gasket 10 is greater, and the contact friction force is also greater. Due to the action of internal and external constraints, over-clamping of the corner is not easy to occur, thereby avoiding local over-compression failure of the sealing gasket 10.

[0044] In some embodiments, as Figure 5 As shown, the second stop 9 includes two vertically connected branches 9-1, and a transition portion 9-2 is provided at one end of the branch 9-1 away from the corner. The distance between the side of the transition portion 9-2 close to the first stop 7-1 and the first stop 7-1 is a first distance, and the first distance gradually increases in the direction away from the corner of the accommodating groove.

[0045] like Figure 5 As shown, the L-shaped second stop 9 includes two vertically connected branches 9-1, and a transition portion 9-2 is provided at the end of the branch 9-1. The width of the transition portion 9-2 is continuously narrowed, which has adapted to the increased width of the middle area of the aforementioned sealing gasket 10; the distance between the side of the transition portion 9-2 close to the first stop 7-1 and the first stop 7-1 is a first distance, and the first distance gradually increases in the direction away from the corner, that is, the side of the transition portion 9-2 close to the first stop 7-1 is designed to be an inclined surface, thus forming a gradual transition to prevent compression deformation and drastic changes in compression force of the sealing gasket 10; as shown Figure 5 As shown, the angle between the side of the transition portion 9-2 close to the first stop 7-1 and the side of the branch portion 9-1 close to the first stop 7-1 is d, and the angle d can be 165° to 175°, for example, 165°, 170° or 175°, etc., and is not specifically limited.

[0046] In some embodiments, as Figure 6 As shown, the sealing gasket 10 is provided with a transition area between the corner and the middle area, and the sealing gasket 10 in the transition area cooperates with the transition portion 9-2.

[0047] like Figure 6 As shown, the area c in the figure is a transition area, which is a wedge-shaped structure and is adapted to the transition portion 9 - 2 of the second stop 9 , so as to facilitate the smooth change of the width of the sealing gasket 10 .

[0048] In some embodiments, as Figure 4 and Figure 5 As shown, a plurality of bolt holes 7-3 are provided on the first baffle 7-1 at intervals, and the bolt holes 7-3 are used to connect with the clamping plate 5 and the column 4. The length of the branch 9-1 is 0.5 to 1 times the distance between two adjacent bolt holes 7-3.

[0049] like Figure 4 As shown, the first baffle 7-1 is provided with a plurality of bolt holes 7-3 distributed circumferentially to connect the clamping plate 5 and the column 4. The length of the branch 9-1 is set to be greater than or equal to half of the spacing between adjacent bolt holes 7-3, so that the restraining effect of the second baffle 9 exceeds the corner area where sealing is unfavorable, thereby avoiding insufficient clamping effect. The length of the branch 9-1 is set to be less than or equal to the spacing between adjacent bolt holes 7-3, thereby avoiding increasing the clamping force in the middle area and weakening the balance of the overall sealing effect.

[0050] In some embodiments, as Figure 4 As shown, the base plate 7 is rectangular in shape with two diagonals, and the plate body is provided with an avoidance corner 7-4 along the corner of one of the diagonals.

[0051] like Figure 4 As shown, the base plate 7 is rectangular in shape with two diagonals, and a relief angle 7-4 is provided at each of the two corners along one of the diagonals. The relief angle 7-4 facilitates fixing the bolts when installing the columns 4 and the upper and lower clamping plates 5, and does not interfere with the installation of the cover assembly 6. In addition, this design can make the structures of the four cover assemblies 6 completely consistent, and the structures of the four columns 4 are also completely consistent, and can be rotated and interchanged, which makes processing, material preparation and inventory management more convenient.

[0052] In some embodiments, the distance between the second stop 9 and the first stop 7-1 close to the avoidance angle 7-4 is a second distance, and the distance between the second stop 9 and the first stop 7-1 away from the avoidance angle 7-4 is a third distance, and the second distance is smaller than the third distance.

[0053] The corners where the avoidance angle 7-4 is set have a smaller pressing force than other corners and are more prone to leakage. The second stop 9 near the avoidance angle 7-4 is set closer to the first stop 7-1, which can compensate for the difference in pressing force between different corners to improve the sealing effect; accordingly, the width of the sealing gasket 10 near the avoidance angle 7-4 is set to be smaller than the width of the corner away from the avoidance angle 7-4, which can further improve the sealing effect.

[0054] In some embodiments of the present application, a heat exchanger is provided, such as Figures 1 to 3As shown, it includes a frame and a core plate bundle 1 arranged in the frame, the frame includes a clamping plate 5, a column 4 and a cover plate assembly 6 as described in any of the above embodiments, the top and bottom of the core plate bundle 1 are respectively provided with a pressure plate 2, the pressure plate 2 is provided with the clamping plate 5 on the side away from the core plate bundle 1, the side corner of the core plate bundle 1 is provided with a bushing 3, the column 4 is provided in the bushing 3, the vertical edge of the bushing 3 is provided with a first folded edge 3-1, the horizontal edge of the pressure plate 2 is provided with a second folded edge 2-1, the ends of the first folded edge 3-1 and the second folded edge 2-1 are abutted against each other to form a sealing surface, the cover plate assembly 6 is abutted against the sealing surface, and is detachably connected to the clamping plate 5 and the column 4.

[0055] The heat exchanger has the same effect as the aforementioned cover plate assembly 6, and will not be described in detail here.

[0056] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present application (including the claims) is limited to these examples. Within the scope of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0057] In addition, when details are set forth to describe exemplary embodiments of the present application, it will be apparent to those skilled in the art that the present application embodiments can be implemented without these details or with variations in these details. Therefore, these descriptions should be considered illustrative rather than restrictive.

[0058] While the present application has been described in conjunction with the embodiments thereof, many alternatives, modifications and variations of these embodiments will be apparent to those skilled in the art in light of the foregoing description.

[0059] The embodiments of the present application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of this application.

Claims

1. A cover plate assembly, characterized in that: Applicable to a heat exchanger, the heat exchanger includes a frame and a core plate bundle arranged in the frame, the frame includes a compression plate, a column and the cover plate assembly; the top and bottom of the core plate bundle are respectively provided with a pressure plate, the pressure plate is provided on the side away from the core plate bundle, the side corner of the core plate bundle is provided with a bushing, the column is provided in the bushing, the vertical edge of the bushing is provided with a first folded edge, the horizontal edge of the pressure plate is provided with a second folded edge, the ends of the first folded edge and the second folded edge are abutted to form a sealing surface, and the cover plate assembly is abutted against the sealing surface; The cover plate assembly includes: a base plate for connecting with the clamping plate and the column, a first stopper is provided on the outer periphery of the base plate, and an avoidance groove extending along the first folding edge is provided at the corner of the first stopper; a lining plate is provided in the middle of the base plate, the edge of the lining plate is abutted against the first stopper, and the bottom height of the avoidance groove is higher than the top height of the lining plate; an L-shaped second stopper is provided at the corner of the lining plate, and the first stopper, the lining plate, the avoidance groove and the second stopper form a receiving groove, and a circle of matching sealing gaskets is provided in the receiving groove, and the sealing gasket is used to abut against the sealing surface.

2. The cover plate assembly according to claim 1, wherein: The distance between the bottom of the avoidance groove and the top of the lining plate is less than or equal to half the thickness of the sealing gasket, and the thickness of the second stop is less than or equal to half the thickness of the sealing gasket.

3. The cover plate assembly according to claim 1, wherein: The area between two adjacent corners on the sealing gasket is a middle area, and the width of the sealing gasket at the corners is smaller than the width of the sealing gasket in the middle area.

4. The cover plate assembly according to claim 3, wherein: The second stop includes two vertically connected branches, and a transition portion is provided at one end of the branch away from the corner. The distance between the side of the transition portion close to the first stop and the first stop is a first distance, and the first distance gradually increases in the direction away from the corner of the accommodating groove.

5. The cover plate assembly according to claim 4, wherein: The sealing gasket is provided with a transition area between the corner and the middle area, and the sealing gasket in the transition area cooperates with the transition portion.

6. The cover plate assembly according to claim 4, wherein: An included angle between a side of the transition portion close to the first stop and a side of the branch portion close to the first stop is 165° to 175°.

7. The cover plate assembly according to claim 4, wherein: The first stop is provided with a plurality of bolt holes at intervals, the bolt holes being used to connect with the pressing plate and the column, and the length of the branch is 0.5 to 1 times the distance between two adjacent bolt holes.

8. The cover plate assembly according to claim 1, wherein: The base plate is in a rectangular shape with two diagonal lines, and the plate body is provided with a relief angle at a corner along one of the diagonal lines.

9. The cover plate assembly according to claim 8, wherein: The distance between the second stop near the avoidance angle and the first stop is a second distance, and the distance between the second stop and the first stop away from the avoidance angle is a third distance, and the second distance is smaller than the third distance.

10. A heat exchanger, characterized in that: It includes a frame and a core plate bundle arranged in the frame, the frame includes a compression plate, a column and a cover plate assembly as described in any one of claims 1 to 9, the top and bottom of the core plate bundle are respectively provided with pressure plates, the pressure plate is provided with the compression plate on the side away from the core plate bundle, the side corner of the core plate bundle is provided with a bushing, the column is provided in the bushing, the vertical edge of the bushing is provided with a first folded edge, the horizontal edge of the pressure plate is provided with a second folded edge, the ends of the first folded edge and the second folded edge are abutted against each other to form a sealing surface, the cover plate assembly is abutted against the sealing surface, and is detachably connected to the compression plate and the column.

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