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Combined type flexible clamp for vacuum brazing of core body of plate-fin type aluminum heat exchanger

A plate-fin heat exchanger and flexible fixture technology, which is applied in the field of aluminum alloy welding, can solve the problems of heat exchanger core leakage brazing seam performance, brazing seam performance can not meet the requirements, heat exchanger core leakage and other problems , to achieve the effect of low cost, long service life and strong reliability

Active Publication Date: 2012-06-13
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the local brazing gap is too large, it will cause local non-welding and lead to local leakage of the heat exchanger core or the performance of the brazing seam cannot meet the requirements
The shrinkage deformation of the fins, deflectors, partitions, guard plates and seals must also be coordinated during the cooling stage to ensure the formation of a well-brazed weld. The incoordination of local shrinkage deformation will cause local unwelded or brazed joints. Defects such as cracks in the weld seam lead to local leakage of the heat exchanger core or the performance of the brazing seam cannot meet the requirements

Method used

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  • Combined type flexible clamp for vacuum brazing of core body of plate-fin type aluminum heat exchanger
  • Combined type flexible clamp for vacuum brazing of core body of plate-fin type aluminum heat exchanger
  • Combined type flexible clamp for vacuum brazing of core body of plate-fin type aluminum heat exchanger

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The core size of a certain type of aluminum plate-fin heat exchanger with two heat exchange channels is (length × width × height): 830 × 150 × 973mm. The material of the guard plate is 3003 aluminum alloy plate, the size is (length×width×thickness): 830×150×4 mm; the material of the fin is 3003 aluminum alloy plate, the thickness is 0.2 mm, zigzag fin; the material of the partition is 434 Aluminum alloy cladding plate, the size is (length×width×thickness): 830×150×1.2mm; the seal material is 3003 aluminum alloy, cubic seal, and the size of seal 1 is (length×width×height): 150×15× 9.5mm, the size of the seal 2 is (length×width×height): 830×3×2.5mm; the brazing material brazed between the guard plate, the fin and the seal is 0.1mm thick 4004 brazing filler metal, the size is ( Length x width): 830 x 150mm.

[0052] The relevant parameters of the combined flexible fixture are as follows:

[0053] A bottom plate is made of 1Cr18Ni9Ti stainless steel plate with a thickness...

Embodiment 2

[0070] The core size of a certain type of aluminum plate-fin heat exchanger with two heat exchange channels is (length × width × height): 470 × 210 × 327mm. The material of the guard plate is 3003 aluminum alloy plate, the size is (length×width×thickness): 470×210×6 mm; the material of the fin is 3003 aluminum alloy plate, the thickness is 0.6 mm, straight fin; the material of the separator is 434 aluminum alloy cladding plate, the size is (length×width×thickness): 470×210×1.2mm; the seal material is 3003 aluminum alloy, cubic seal, and the size of seal 1 is (length×width×height): 210×12 ×9.5mm, the size of the seal 2 is (length×width×height): 470×12×3mm; the brazing material brazed between the guard plate, the fin and the seal is 0.1mm thick 4004 brazing filler metal, the size is ( Length x width): 470 x 210 mm.

[0071] The relevant parameters of the combined flexible fixture are as follows:

[0072] Base plate, spring and groove type spring pressing plate are the same as ...

Embodiment 3

[0082] The core size of a certain type of aluminum plate-fin heat exchanger with two heat exchange channels is (length × width × height): 488 × 150 × 1440mm. The material of the guard plate is 3003 aluminum alloy plate, the size is (length×width×thickness): 488×150×8 mm; the material of the fin is 3003 aluminum alloy plate, the thickness is 0.3 mm, zigzag fin; the material of the partition is 434 Aluminum alloy cladding plate, size (length×width×thickness): 488×150×1.2mm; seal material is 3003 aluminum alloy, cubic seal, and the size of seal 1 is (length×width×height): 150×8× 3mm, the size of the seal 2 is (length×width×height): 488×2.5×3mm; the brazing material brazed between the guard plate and the fin and the seal is 0.1mm thick 4004 brazing filler metal sheet, the size is (length× width): 488×150mm.

[0083] The relevant parameters of the combined flexible fixture are as follows:

[0084] Base plate, spring and groove type spring pressing plate are the same as embodiment...

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Abstract

The invention discloses a combined type flexible clamp for vacuum brazing of a core body of a plate-fin type aluminum heat exchanger, belonging to the technical field of aluminum alloy welding. The combined type flexible clamp for assembling the core body of the plate-fin type aluminum heat exchanger before the vacuum brazing is characterized by comprising a bottom plate, pull rods, springs, grooved spring bearer plates, a grid frame, a cover plate and top sliding plates and being of a combined type detachable independent element structure, wherein the constituent elements of the clamp are combined according to the dimension of the core body, to be brazed, of the heat exchanger. The springs of the clamp are paired into groups and kept dynamically balanced through the grooved spring bearer plates and the pull rods, so as to fixedly position each constituent element of the core body of the heat exchanger and supply flexible pressure to the core body of the heat exchanger in a vacuum brazing process, so that the constituent elements in each group of the core body of the heat exchanger are coordinated in deformation, and the brazing requirement is met. According to the invention, a flexible pressing method and a combined type structure are adopted, and the clamp is simple structure, convenient to use, strong in reliability, low in cost, wide in applicable range, long in service life and good in economy.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy welding, and in particular relates to a vacuum brazing combined flexible fixture for the core body of an aluminum plate-fin heat exchanger. Background technique [0002] Aluminum plate-fin heat exchanger has the characteristics of small thermal resistance, high heat exchange efficiency, compact structure, small size, light weight, strong adaptability, durability, and good economy. It is widely used in aerospace, shipbuilding, petrochemical, atomic energy And engineering machinery and other fields have been widely used. [0003] The aluminum plate-fin heat exchanger is assembled and welded by the heat exchanger core and the head through argon tungsten arc welding. The basic structure of the heat exchanger core is a unit stacked structure composed of fins, deflectors, partitions, guards and seals. The material of fins, guides, guards and seals is usually 3003 aluminum alloy. The separator i...

Claims

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Application Information

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IPC IPC(8): B23K37/04B23K3/08B23K1/008
Inventor 罗伟王春梅王惠云严密黄鹏王丽腾马天宇
Owner ZHEJIANG UNIV
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