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Lamination-based vacuum brazing method for core part of plate-fin type aluminum heat exchanger

A brazing method and heat exchanger technology, which is applied in the field of aluminum alloy welding, can solve the problems of time-consuming and other problems, and achieve the effects of reducing production costs, strong operability and controllability, and simple process

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

Vacuum brazing is time consuming due to the multiple steps involved

Method used

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  • Lamination-based vacuum brazing method for core part of plate-fin type aluminum heat exchanger
  • Lamination-based vacuum brazing method for core part of plate-fin type aluminum heat exchanger

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The core size of a heat exchanger with two heat exchange channels is (length×width×height): 427×190×102mm, the side plate size is 427×190mm, and 4004 brazing filler metal with a thickness of 0.1mm is used as the heat exchanger core The brazing material for brazing between the upper side plate and the fins and seals is to use 3003 aluminum alloy plate with a thickness of 6mm and R-5461-S mica tape with a thickness of 0.15mm as the isolation layer between adjacent heat exchanger cores Materials, 12 heat exchanger cores are stacked and assembled, and after the assembly inspection is passed, they are sent to a vacuum brazing furnace for brazing, and the brazing chamber is evacuated to 7×10 -4 At Pa, start to heat up to 200°C and 540°C at a heating rate of 10°C / min for 20 minutes respectively, then raise the temperature to 605°C at a heating rate of 4°C / min and hold for 5 minutes, then stop heating until the brazing chamber cools down to 360°C Close the vacuum system at ℃, o...

Embodiment 2

[0029]The core size of a heat exchanger with two heat exchange channels is (length×width×height): 470×210×327mm, the side plate size is 470×210 mm, and a 4004 brazing sheet with a thickness of 0.1mm is used as the heat exchanger The brazing material used for brazing between the core side plates, fins and seals is 3003 aluminum alloy plate with a thickness of 6mm and R-5461-S mica tape with a thickness of 0.15mm as the insulation between adjacent heat exchanger cores Layer materials, 4 heat exchanger cores are stacked and assembled, and after the assembly inspection is passed, they are sent to a vacuum brazing furnace for brazing, and the brazing chamber is evacuated to 8×10 -4 At Pa, start to heat up to 200°C and 540°C at a rate of 9°C / min and hold for 15 minutes each, then raise the temperature to 605°C at a rate of 3°C / min and hold for 5 minutes, then stop heating until the temperature of the brazing chamber cools down to 350°C Turn off the vacuum system at the same time, op...

Embodiment 3

[0031] The core size of a heat exchanger with two heat exchange channels is (length×width×height): 400×200×491mm, the side plate size is 400×200 mm, and a 4004 brazing sheet with a thickness of 0.1mm is used as the heat exchanger The brazing material for brazing between the core side plate and the fins and seals is to use a pure aluminum plate with a thickness of 6 mm and a R-5461-S mica tape with a thickness of 0.15 mm as the isolation layer between adjacent heat exchanger cores Materials, 3 heat exchanger cores are laminated and assembled, and after the assembly inspection is passed, they are sent to a vacuum brazing furnace for brazing, and the brazing chamber is vacuumed to 8×10 -4 At Pa, start to heat up to 200°C and 540°C at a heating rate of 8°C / min and keep warm for 20 minutes, then raise the temperature to 605°C at a heating rate of 3°C / min and hold for 4 minutes, then stop heating, and wait for the brazing chamber to cool down to 350°C Turn off the vacuum system at t...

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Abstract

The invention discloses a vacuum brazing technological method for a core part of a plate-fin type aluminum heat exchanger. A vacuum brazing technology adopted for brazing the core part of the plate-fin type aluminum heat exchanger comprises the steps of: laminating and assembling a plurality of heat-exchanger core parts with consistent side pate dimensions in a height direction and are fixed through a flexible clamp, additionally arranging a sandwiched structure composed of two layers of mica tapes and one layer of pure aluminum or a 3003 aluminum alloy plate between every two adjacent heat-exchanger core parts, feeding into a vacuum brazing furnace for brazing after assembly, and separating the plurality of brazed heat-exchanger core parts after the plurality of heat-exchanger core parts are brazed and discharged out of the furnace. According to the invention, as the plurality of heat-exchanger core parts are laminated and assembled for vacuum brazing, the advantages of simple process, strong operability, good controllability and high brazing efficiency are achieved, the production cost is effectively reduced, and the consistency in product quality is increased.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy welding, and in particular relates to a vacuum brazing method for the core of an aluminum plate-fin heat exchanger. Background technique [0002] Aluminum plate-fin heat exchanger is a novel heat exchanger with aluminum alloy corrugated fins as the heat transfer element. It is the most advanced heat exchanger at home and abroad. It has small thermal resistance, high heat exchange efficiency and compact structure. , small size, light weight, strong adaptability, durability, good economy, and can be designed as many as more than ten streams of fluid heat exchange at the same time. It was originally used in military fields such as aviation and submarines, and has been widely used in petroleum Chemical industry, aerospace, electronics, atomic energy and construction machinery and other fields. [0003] The aluminum plate-fin heat exchanger is assembled and welded by the heat exchanger core and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/008
Inventor 罗伟王琪明严密史佩珍黄鹏马天宇
Owner ZHEJIANG UNIV
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