Thermal stress resistant sealing strip for plate-fin heat exchanger

Abstract

The utility model discloses an anti-thermal stress sealing strip for a plate-fin heat exchanger, which relates to the technical field of plate-fin heat exchangers and comprises a strip-shaped sealing strip main body, the thickness size of the sealing strip main body in the horizontal direction is gradually increased in the direction from the two ends of the sealing strip main body to the middle part between the two ends of the sealing strip main body; the sealing strip body comprises a first surface and a second surface. The first surface is the upper surface of the seal main body; the second surface is the lower surface of the seal main body; mounting areas are arranged on the first surface and the second surface; the installation areas are distributed in the length direction of the seal strip body, and the width sizes of all the installation areas are kept consistent. The mounting area of the first surface and the mounting area of the second surface are connected to upper and lower partition plates of the plate bundle respectively. According to the anti-thermal-stress sealing strip for the plate-fin heat exchanger, the sealing strip structure with the two ends gradually thinned is arranged, so that the stress peak value at the end of the sealing strip is avoided, and the situation that the joint of the end of the sealing strip and a partition plate cracks and deforms is effectively avoided.

Description

Technical Field

[0001] This utility model relates to the field of plate-fin heat exchanger technology, and in particular to a thermal stress-resistant sealing strip for plate-fin heat exchangers. Background Technology

[0002] The core component of a plate-fin heat exchanger is the plate bundle, which consists of baffles, fins, seals, and guide vanes. Fins, guide vanes, and seals are placed between adjacent baffles to form a sandwich layer, called a channel. These sandwich layers are stacked according to different fluid flow patterns and brazed together to form the plate bundle. The seals are long, strip-shaped structural components located on both sides of the plate bundle, serving to provide structural support and prevent leakage.

[0003] When the heat exchanger is operating, the different coefficients of thermal expansion of the seals, baffles, and fins, or the large temperature difference between different areas of the same component, cause mutual constraint and generate thermal stress. This leads to bending stress along the thickness of the seal, especially in thick-walled seals, resulting in fatigue cracking and plastic deformation.

[0004] Chinese utility model patent application number 202121518836.2 discloses a heat-stress-resistant sealing strip and a plate-fin heat exchanger core using the heat-stress-resistant sealing strip. This patent reduces concentrated thermal stress at the connection between the baffle and the sealing strip by employing a small-angle connection strip. However, in this patent, the thickness of the sealing strip is consistent at all locations, causing stress concentration zones to form at the protruding ends of the sealing strip. This fails to effectively eliminate thermal stress in these areas, leading to easy cracking and deformation at the connection between the sealing strip end and the baffle. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a thermal stress resistant sealing strip for plate-fin heat exchangers. The sealing strip has a structure that gradually thins at both ends. The gradually thickening structure disperses the stress along the thickness direction, avoiding stress peaks at the ends of the sealing strip and effectively preventing cracking and deformation at the connection between the ends of the sealing strip and the partition plate.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] This utility model provides a thermal stress-resistant sealing strip for a plate-fin heat exchanger, comprising a strip-shaped sealing strip body; the thickness of the sealing strip body gradually increases in the horizontal direction away from the plate bundle fins, with both ends facing the middle portion between the two ends of the sealing strip body; the sealing strip body includes a first surface and a second surface; the first surface is the upper surface of the sealing strip body; the second surface is the lower surface of the sealing strip body; both the first and second surfaces are provided with mounting areas; the mounting areas are distributed along the length direction of the sealing strip body, and the width of the mounting areas is consistent at all points in the horizontal thickness direction of the sealing strip body; the mounting area of ​​the first surface is connected to the upper partition of the plate bundle; the mounting area of ​​the second surface is connected to the lower partition of the plate bundle.

[0008] The thermal stress-resistant sealing strip for plate-fin heat exchangers provided by this utility model preferably has several square grooves on the mounting area of ​​the first surface; the length direction of the square grooves is the same as the length direction of the sealing strip body; the several square grooves are arranged at intervals along the length direction of the sealing strip body; an arched spring is provided in the square groove; the arched top of the spring faces away from the side where the plate bundle fins are located; the arched feet at both ends of the spring face the side where the plate bundle fins are located; the arched top and the arched feet of the spring are in contact with the inner wall of the square groove.

[0009] The thermal stress-resistant sealing strip for plate-fin heat exchangers provided by this utility model preferably includes a square groove with a supporting surface; the supporting surface contacts the dome of the spring; a limiting rod is provided on the supporting surface in the direction of the spring; the limiting rod passes through the dome of the spring.

[0010] The thermal stress-resistant sealing strip for plate-fin heat exchangers provided by this utility model preferably has a top cover on the square groove; the top cover covers the opening of the square groove; and the upper surface of the top cover is flush with the first surface.

[0011] The thermal stress resistant sealing strip for plate-fin heat exchangers provided by this utility model preferably includes a third surface as the main body of the sealing strip; the third surface is the inner side of the main body of the sealing strip facing the plate bundle fins; the third surface is covered with an anti-stress layer; the main body of the sealing strip is made of stainless steel; and the anti-stress layer is made of aluminum alloy.

[0012] The above technical solution has the following advantages or beneficial effects: This utility model provides a heat-resistant stress-resistant sealing strip for plate-fin heat exchangers, relating to the field of plate-fin heat exchanger technology. It includes a strip-shaped sealing strip body; the thickness of the sealing strip body gradually increases in the horizontal direction from both ends toward the middle portion between the two ends; the sealing strip body includes a first surface and a second surface; the first surface is the upper surface of the sealing strip body; the second surface is the lower surface of the sealing strip body; both the first and second surfaces have mounting areas; the mounting areas are distributed along the length of the sealing strip body, and the width of the mounting areas remains consistent throughout the horizontal thickness direction of the sealing strip body; the mounting area of ​​the first surface is connected to the upper partition of the plate bundle; the mounting area of ​​the second surface is connected to the lower partition of the plate bundle. This utility model provides a heat-resistant stress-resistant sealing strip for plate-fin heat exchangers, featuring a sealing strip structure that gradually thins at both ends. The gradually thickening structure disperses stress along the thickness direction, preventing stress peaks at the sealing strip ends and effectively preventing cracking and deformation at the connection between the sealing strip ends and the partition. Attached Figure Description

[0013] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0014] Figure 1 A top view of a thermal stress-resistant seal for a plate-fin heat exchanger provided in Embodiment 1 of this utility model;

[0015] Figure 2 A bottom view of a thermal stress-resistant seal for a plate-fin heat exchanger provided in Embodiment 1 of this utility model;

[0016] Figure 3 This is a diagram showing the internal structure of a square groove for a heat-resistant stress seal used in a plate-fin heat exchanger, as provided in Embodiment 1 of this utility model.

[0017] Figure 1-3 Includes: 1. Seal body; 11. First surface; 12. Second surface; 13. Installation area; 2. Square groove; 21. Spring piece; 22. Support surface; 23. Limiting rod; 24. Top cover; 3. Stress-resistant layer. Detailed Implementation

[0018] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0019] Example 1:

[0020] like Figure 1-3 As shown:

[0021] When a plate-fin heat exchanger is in operation, the seals expand due to the temperature gradient, causing significant thermal stress at the ends of the seals due to their rigid connection with the baffles and fins. To smoothly transition thermal stress within the structure and avoid localized stress concentration, this utility model provides a thermal stress-resistant seal for a plate-fin heat exchanger, comprising a strip-shaped seal body 1; the thickness of the seal body 1 in the horizontal direction gradually increases towards the side opposite to the plate bundle fins, with both ends facing the middle portion between the two ends of the seal body 1; the seal body 1 includes a first surface 11 and a second surface 12; the first surface 11 is the upper surface of the seal body 1; the second surface 12 is the lower surface of the seal body 1; both the first surface 11 and the second surface 12 are provided with mounting areas 13; the mounting areas 13 are distributed along the length direction of the seal body 1, and the width of the mounting areas 13 is consistent at all points in the horizontal thickness direction of the seal body 1; the mounting area 13 of the first surface 11 is connected to the upper partition of the plate bundle; the mounting area 13 of the second surface 12 is connected to the lower partition of the plate bundle.

[0022] Since the thickness of the seal body 1 gradually decreases towards both ends in the horizontal direction, the connection surface needs to be uniform in order for the seal body 1 to be firmly connected to the upper and lower partitions. Therefore, mounting areas 13 of the same width are provided on the first surface 11 and the second surface 12. After the partitions are attached to the mounting areas 13, they are brazed together. The thickened part of the seal body 1 outside the mounting areas 13 faces outward to provide a smoothing effect on stress.

[0023] The sealing strip body 1 of this utility model adopts a gradually changing structure that is thicker in the middle and thinner at both ends. By adjusting the thickness variation, the stiffness distribution of the overall structure is adjusted, so that the stress is evenly distributed along the length of the sealing strip body 1, reducing the stress concentration at the thinner ends of the sealing strip body 1. The thinner end structure allows it to undergo local elastic bending or stretching during thermal deformation, releasing some thermal stress, while the thicker middle part restricts excessive overall deformation and avoids structural failure.

[0024] The present invention provides a thermal stress-resistant sealing strip for plate-fin heat exchangers. Through a gradually thickened structure, the stress is gradually dispersed along the thickness direction, effectively preventing cracking and deformation at the connection between the end of the sealing strip and the partition plate.

[0025] Because the thermal expansion rates of the partition and the seal are different in high-temperature working environments, the difference in deformation of the partition will exert additional force on the seal, which may lead to leakage. In order to increase the stress resistance and structural strength of the seal itself, in a preferred embodiment, the mounting area 13 of the first surface 11 is provided with a plurality of square grooves 2; the length direction of the square grooves 2 is the same as the length direction of the seal body 1; the plurality of square grooves 2 are arranged at intervals along the length direction of the seal body 1; an arched spring piece 21 is provided in the square groove 2; the arched top of the spring piece 21 faces away from the side where the plate bundle fins are located; the arched feet at both ends of the spring piece 21 face the side where the plate bundle fins are located; the arched top and the arched feet of the spring piece 21 are in contact with the inner wall of the square groove 2.

[0026] The creation of multiple square grooves 2 in the seal body 1 can form a reinforcing rib structure, which can reduce the weight of the seal body 1 and improve the structural strength. This results in less deformation of the seal body 1 when subjected to pressure or shear force from the upper and lower partitions, thereby reducing the possibility of seal failure.

[0027] Because the inner side of the seal body 1 is in contact with a hot fluid during operation, its temperature is much higher than that of the outer side. This difference in deformation between the inner and outer sides of the seal body 1 causes deformation. To further improve the structural strength of the seal body 1 and enhance its resistance to deformation, an arched spring piece 21 is installed inside the square groove 2. Since the arched direction of the spring piece 21 is the same as the horizontal thickness direction of the seal body 1, the spring piece 21 can provide elastic support to both sides of the seal body 1 in the horizontal thickness direction inside the square groove 2, thus offsetting the difference in deformation between the inner and outer sides of the seal body 1.

[0028] The present invention provides a heat-resistant stress seal for plate-fin heat exchangers. By setting a square groove 2 in which a spring piece 21 is placed, the seal body 1 can effectively improve its resistance to deformation and avoid excessive deformation of the seal body 1, which would lead to a decrease in sealing performance.

[0029] To prevent the spring plate 21 from shifting due to vibration during heat exchanger operation, it needs to be limited. In a preferred embodiment, the square groove 2 includes a support surface 22; the support surface 22 contacts the dome of the spring plate 21; the support surface 22 is provided with a limiting rod 23 in the direction of the spring plate 21; the limiting rod 23 passes through the dome of the spring plate 21.

[0030] Since the partition plate and the mounting area 13 need to be brazed together, the surfaces of the partition plate and the mounting area 13 need to be flat to ensure the stability of the connection. In a preferred embodiment, the square groove 2 is provided with a top cover 24; the top cover 24 covers the groove opening of the square groove 2; the upper surface of the top cover 24 is flush with the first surface 11. A recessed platform structure can be provided around the groove opening of the square groove 2 to provide clearance for the top cover 24, so that the top cover 24 can be fitted into the recessed platform, thereby achieving that the top cover 24 is flush with the first surface 11.

[0031] The present invention provides a heat-resistant stress seal for plate-fin heat exchangers. By setting a top cover 24 flush with the first surface 11 at the opening of the square groove 2, the partition can effectively fit the surface of the installation area 13, ensuring the stability of the connection.

[0032] To buffer the uneven stress caused by the differential deformation of the inner and outer sides of the seal body 1, in a preferred embodiment, the seal body 1 further includes a third surface; the third surface is the inner side of the seal body 1 facing the plate bundle fins; the third surface is covered with a stress-resistant layer 3; the seal body 1 is made of stainless steel; and the stress-resistant layer 3 is made of aluminum alloy. The third surface, which directly contacts the internal channel, is made of a lower-strength aluminum alloy structure, while the outer part, which bears a larger mechanical load, is made of a higher-strength stainless steel structure. By forming a gradient composite structure, the mechanical load is borne by the outer side, while the softer material on the inner side alleviates stress transmission, forming a stress buffer layer.

[0033] The present invention provides a thermal stress-resistant seal for plate-fin heat exchangers. By providing a softer stress-resistant layer 3 on the inner side of the seal body 1 to alleviate stress transmission, the thermal stress on the seal body 1 as a whole can be effectively reduced.

[0034] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the application filed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not claimed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the appended claims.

[0035] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A thermal stress-resistant sealing strip for plate-fin heat exchangers, characterized in that, The device includes a strip-shaped sealing strip body; the thickness of the sealing strip body gradually increases in the horizontal direction towards the side opposite to the fins of the plate bundle, with both ends facing the middle portion between the two ends of the sealing strip body; the sealing strip body includes a first surface and a second surface; the first surface is the upper surface of the sealing strip body; the second surface is the lower surface of the sealing strip body; both the first surface and the second surface are provided with mounting areas; the mounting areas are distributed along the length direction of the sealing strip body, and the width of the mounting areas is consistent at all points in the horizontal thickness direction of the sealing strip body; the mounting area of ​​the first surface is connected to the upper partition of the plate bundle; the mounting area of ​​the second surface is connected to the lower partition of the plate bundle.

2. The thermal stress-resistant sealing strip for plate-fin heat exchangers according to claim 1, characterized in that, The mounting area of ​​the first surface is provided with several square grooves; the length direction of the square grooves is the same as the length direction of the sealing strip body; the square grooves are arranged at intervals along the length direction of the sealing strip body; an arched spring is provided in the square groove; the arch of the spring faces away from the side where the plate bundle fins are located; the arched feet at both ends of the spring face the side where the plate bundle fins are located; the arch of the spring and the arched feet of the spring are in contact with the inner sidewall of the square groove.

3. The thermal stress-resistant sealing strip for plate-fin heat exchangers according to claim 2, characterized in that, The square groove includes a support surface; the support surface contacts the dome of the spring piece; the support surface is provided with a limit rod in the direction of the spring piece; the limit rod passes through the dome of the spring piece.

4. The thermal stress-resistant sealing strip for plate-fin heat exchangers according to claim 2, characterized in that, The square groove is provided with a top cover; the top cover covers the opening of the square groove; the upper surface of the top cover is flush with the first surface.

5. The thermal stress-resistant sealing strip for plate-fin heat exchangers according to claim 1, characterized in that, The seal body also includes a third surface; the third surface is the inner side of the seal body facing the plate bundle fins; the third surface is covered with a stress-resistant layer; the seal body is made of stainless steel; the stress-resistant layer is made of aluminum alloy.

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