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CN-224215939-U - Thermal stress resistant seal strip for plate-fin heat exchanger

CN224215939UCN 224215939 UCN224215939 UCN 224215939UCN-224215939-U

Abstract

The utility model discloses a thermal stress resistant seal for a plate-fin heat exchanger, which relates to the technical field of plate-fin heat exchangers and comprises a strip seal body, wherein the thickness dimension of the seal body in the horizontal direction is gradually increased in the direction of the middle part between the two ends of the seal body, the seal body comprises a first surface and a second surface, the first surface is the upper surface of the seal body, the second surface is the lower surface of the seal body, mounting areas are respectively arranged on the first surface and the second surface, the mounting areas are distributed along the length direction of the seal body, the width dimension of each part of the mounting areas is kept consistent, and the mounting areas of the first surface and the mounting areas of the second surface are respectively connected with upper and lower layers of partition plates of a plate bundle. The utility model provides a thermal stress resistant seal strip for a plate-fin heat exchanger, which is provided with a seal strip structure with gradually thinned two ends, so that the stress peak at the end part of the seal strip is avoided, and the condition that the joint part of the end part of the seal strip and a baffle plate is cracked and deformed is effectively avoided.

Inventors

  • ZHU XIAO

Assignees

  • 无锡华铭铝业有限公司

Dates

Publication Date
20260508
Application Date
20250528

Claims (5)

  1. 1. The heat stress resistant seal for the plate fin type heat exchanger is characterized by comprising a strip seal body, wherein the two ends of the seal body are in a direction towards the middle part between the two ends of the seal body, the thickness dimension of the seal body in the horizontal direction is gradually increased towards the direction opposite to one side of a plate bundle fin, the seal body comprises a first surface and a second surface, the first surface is the upper surface of the seal body, the second surface is the lower surface of the seal body, mounting areas are arranged on the first surface and the second surface, the mounting areas are distributed along the length direction of the seal body, the width dimension of each mounting area in the horizontal thickness direction of the seal body is consistent, the mounting area of the first surface is connected with an upper-layer partition plate of the plate bundle, and the mounting area of the second surface is connected with a lower-layer partition plate of the plate bundle.
  2. 2. The heat stress resistant seal for the plate fin heat exchanger according to claim 1, wherein the installation area of the first surface is provided with a plurality of square grooves, the length direction of each square groove is in the same direction as the length direction of the seal main body, the square grooves are distributed at intervals along the length direction of the seal main body, arched spring plates are arranged in the square grooves, the vaults of the spring plates are opposite to one side where the plate bundle fins are located, the arch feet at two ends of the spring plates are opposite to one side where the plate bundle fins are located, and the vaults of the spring plates and the arch feet of the spring plates are in contact with the inner side walls of the square grooves.
  3. 3. The heat stress resistant seal for a plate fin heat exchanger according to claim 2, wherein the square groove includes a support surface, the support surface is in contact with a dome of the spring plate, the support surface is provided with a limit rod in a direction toward the dome of the spring plate, and the limit rod passes through the dome of the spring plate.
  4. 4. The heat stress resistant seal for a plate fin heat exchanger according to claim 2, wherein the square groove is provided with a top cover, the top cover covers a notch of the square groove, and an upper surface of the top cover is flush with the first surface.
  5. 5. The heat stress resistant seal for a plate fin heat exchanger according to claim 1, wherein the seal body further comprises a third surface, the third surface is an inner side surface 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, and the stress resistant layer is made of aluminum alloy.

Description

Thermal stress resistant seal strip for plate-fin heat exchanger Technical Field The utility model relates to the technical field of plate-fin heat exchangers, in particular to a thermal stress resistant seal strip for a plate-fin heat exchanger. Background The core part of the plate-fin heat exchanger is a plate bundle, and the plate bundle consists of a baffle plate, fins, seals and guide plates. The fin, the guide vane and the seal are placed between two adjacent partition boards to form an interlayer called a channel. Such interlayers are stacked in a fluid-dependent manner and brazed together to form a bundle. The seal is a strip structural member positioned on two sides of the plate bundle and is used for providing structural support and sealing and preventing leakage. When the heat exchanger works, the sealing strips, the partition plates and the fins are mutually restrained to generate thermal stress due to different thermal expansion coefficients of materials or large temperature difference between different areas of the same component. Bending stresses are induced in the thickness direction of the seal, particularly in thick-walled seals, which lead to fatigue cracking and plastic deformation. The utility model patent with the Chinese patent application number 202121518836.2 discloses a thermal stress resistant seal and a plate-fin heat exchanger core body using the thermal stress resistant seal. The patent reduces the concentrated thermal stress at the junction of the separator and the seal by employing a small angle connection seal. However, in this patent, the thickness of the seal is kept uniform at each position, so that the protruding parts at the two ends of the seal form stress concentration areas, and the thermal stress at the areas cannot be effectively eliminated, which results in easy cracking and deformation at the joint of the end part of the seal and the partition plate. Disclosure of utility model In order to solve the technical problems, the utility model provides a thermal stress resistant seal for a plate-fin heat exchanger, which is provided with seal structures with two gradually thinner ends, and stress is gradually dispersed along the thickness direction through the gradually thickened structures, so that stress peaks at the end parts of the seal are avoided, and the situation that the joint part of the end parts of the seal and a partition plate is cracked and deformed is effectively avoided. In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows: The utility model provides a thermal stress resistant seal for a plate-fin heat exchanger, which comprises a strip seal body, wherein the two ends of the seal body are in a direction towards the middle part between the two ends of the seal body, the thickness dimension of the seal body in the horizontal direction is gradually increased towards the direction away from one side of a plate bundle fin, the seal body comprises a first surface and a second surface, the first surface is the upper surface of the seal body, the second surface is the lower surface of the seal body, the first surface and the second surface are both provided with mounting areas, the mounting areas are distributed along the length direction of the seal body, the width dimension of each mounting area in the horizontal thickness direction of the seal body is consistent, the mounting areas of the first surface are connected with an upper-layer partition plate of the plate bundle, and the mounting areas of the second surface are connected with a lower-layer partition plate of the plate bundle. The heat stress resistant seal for the plate fin type heat exchanger is characterized in that a plurality of square grooves are formed in an installation area of a first surface, the length direction of each square groove is in the same direction as the length direction of a seal main body, the square grooves are distributed at intervals along the length direction of the seal main body, arch-shaped spring plates are arranged in the square grooves, the arch tops of the spring plates face away from one side where the plate bundle fins are located, arch feet at two ends of the spring plates face one side where the plate bundle fins are located, and the arch tops of the spring plates and the arch feet of the spring plates are in contact with the inner side walls of the square grooves. The heat stress resistant seal for the plate fin heat exchanger provided by the utility model is characterized in that the square groove preferably comprises a supporting surface, the supporting surface is in contact with the vault of the shrapnel, the supporting surface is provided with a limit rod in the direction of the shrapnel, and the limit rod penetrates through the vault of the shrapnel. The heat stress resistant seal for the plate-fin heat exchanger is characterized in that the square groove is provided with a top cover, the top cover covers