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CN-224215936-U - Sectional seal applied to plate-fin heat exchanger

CN224215936UCN 224215936 UCN224215936 UCN 224215936UCN-224215936-U

Abstract

The utility model provides a sectional seal applied to a plate-fin heat exchanger, which relates to the field of heat exchangers and comprises a seal body which is in a bilateral symmetry long strip shape, wherein the seal body is divided into an inlet section and an outlet section along the extending direction of the long strip shape, the outlet section extends behind the inlet section, the upper surfaces, the left surface and the right surface of the inlet section and the outlet section are coplanar, the upper surfaces, the left surface and the right surface are all plane surfaces, the upper surfaces are horizontal, the left surface and the right surface are vertical, the lower side of the inlet section is a concave part, the lower side of the outlet section is a convex part, and the inlet section and the outlet section are in transitional connection through an arc surface. The sectional seal applied to the plate-fin heat exchanger solves the problem that the seal of the plate-fin heat exchanger is difficult to resist medium impact and retain medium in the prior art, can reduce impact damage at an inlet and reduce flow resistance at an outlet.

Inventors

  • ZHU XIAO

Assignees

  • 无锡华铭铝业有限公司

Dates

Publication Date
20260508
Application Date
20250612

Claims (5)

  1. 1. A sectional seal applied to a plate-fin heat exchanger comprises a strip seal body which is symmetric in left-right direction and is characterized in that, The seal body is divided into an inlet section and an outlet section along the extending direction of the strip shape, the outlet section extends behind the inlet section, the upper surfaces, the left surface and the right surface of the inlet section and the outlet section are coplanar, the upper surfaces, the left surface and the right surface are all planes, the upper surface is horizontal, and the left surface and the right surface are vertical; The lower side of the inlet section is a concave part; The lower side of the outlet section is provided with a bulge; The inlet section is in transitional connection with the outlet section through an arc surface at the joint.
  2. 2. The segmented seal for use in a plate-fin heat exchanger of claim 1, wherein the recess is bilaterally symmetrical; The concave part comprises a first lower surface, the convex part comprises a second lower surface, and the first lower surface and the second lower surface are both planes; The first lower surface is in transitional connection with the left surface through a first arc surface which is bent upwards, and the first lower surface is in transitional connection with the right surface through a second arc surface which is bent upwards; The second lower surface is in transitional connection with the left surface through a third arc surface which is bent downwards, and the second lower surface is in transitional connection with the right surface through a fourth arc surface which is bent downwards.
  3. 3. The segmented seal for use in a plate-fin heat exchanger of claim 2, wherein the radians of the first, second, third and fourth arcuate surfaces are less than pi/2 rad.
  4. 4. The sectional seal for a plate-fin heat exchanger according to claim 1, wherein a through hole is formed in the seal body, the through hole is formed along a strip-shaped extending direction of the seal body, and the through hole penetrates through the inlet section and the outlet section.
  5. 5. The segmented seal for a plate-fin heat exchanger according to claim 4, wherein the through hole is rectangular, a long side of the through hole is parallel to an upper surface of the seal body, and a shortest distance between wide sides of the through hole is 1/2 of a distance between a left surface and a right surface of the seal body.

Description

Sectional seal applied to plate-fin heat exchanger Technical Field The utility model relates to the field of heat exchangers, in particular to a sectional seal applied to a plate-fin heat exchanger. Background The plate-fin heat exchanger is used as industrial main stream heat exchange equipment, and the core structure of the plate-fin heat exchanger is composed of parallel partition plates, fins and edge seals. Cold/hot flow channels are respectively formed on two sides of the partition board, and sealing strips are fixed on the edges of the partition board through welding, so that the sealing function of the channels is carried out, and structural support of the cross-partition board is provided. The cold/hot medium flows through the channel at a certain initial speed under the action of the pump drive, wherein: High viscosity and high density media such as hot oil require a relatively high initial velocity to overcome flow resistance, but high velocity flow can produce a sustained impact on the seal, and friction resistance between the fins and the seal surface can cause flow decay at the rear end of the fluid, possibly causing stagnation. In the prior art, the structural design of the seal has obvious technical contradiction: The seal applied to the plate-fin heat exchanger disclosed in China patent application No. 202220921485.8 is designed by the concave surface and the inner arc surface in the middle of the lower surface, fluid impact is concentrated at the bottom end of the concave part, direct scouring of welding seams is reduced, the seal is suitable for a high-pressure impact scene of a medium, but after the flow velocity of the fluid is attenuated (such as the rear end of a channel), a vortex area is easily formed due to abrupt change of the sectional area of a flow channel by the concave structure, and the retention risk of high-viscosity fluid is aggravated. The sealing strip applied to the plate-fin heat exchanger disclosed in China patent application No. 201620989548.8 is designed through the convex+external arc surface in the middle of the lower surface, the curvature of a flow channel is optimized to reduce the flow resistance, high-viscosity fluid stagnation is avoided, the sealing strip is suitable for a low-flow-rate and anti-blocking scene, but a convex structure is difficult to effectively buffer high-speed impact at a fluid inlet, and a welding seam is prone to fatigue cracking due to kinetic energy load. However, when handling high viscosity fluids (e.g., hot oil), the above contradiction is particularly pronounced: In order to ensure the normal passing of the medium, the inlet section needs to push the fluid to enter at a high initial speed, but the concave structure can resist impact and possibly aggravate the pressure drop of the inlet due to the shrinkage of the flow passage, while the fluid at the outlet section reduces the flow speed due to friction resistance, and the convex structure can dredge the flow and can not cope with the impact damage generated at the front end. Disclosure of utility model Aiming at the technical problems, the sectional seal applied to the plate-fin heat exchanger can reduce impact damage at the inlet and reduce flow resistance at the outlet. In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows: The sectional seal applied to the plate-fin heat exchanger comprises a strip seal body which is bilaterally symmetrical and is divided into an inlet section and an outlet section along the extending direction of the strip, the outlet section extends behind the inlet section, the upper surfaces, the left surface and the right surface of the inlet section and the outlet section are coplanar, the upper surfaces, the left surface and the right surface are all plane surfaces, the upper surfaces are horizontal, the left surface and the right surface are vertical, the lower side of the inlet section is a concave part, the lower side of the outlet section is a convex part, and the inlet section and the outlet section are in transitional connection through an arc surface at the joint. The segmented seal applied to the plate-fin heat exchanger is characterized in that the concave portion is bilaterally symmetrical, the convex portion is bilaterally symmetrical, the concave portion comprises a first lower surface, the convex portion comprises a second lower surface, the first lower surface and the second lower surface are all plane surfaces, the first lower surface and the left surface are in transitional connection through an upward bent first arc surface, the first lower surface and the right surface are in transitional connection through an upward bent second arc surface, the second lower surface and the left surface are in transitional connection through a downward bent third arc surface, and the second lower surface and the right surface are in transitional connection through a downward bent fourth arc surface. The