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A glue coating process for aircraft heat exchanger

A heat exchanger and heat exchanger temperature technology, applied in coatings, adhesives, epoxy resin glue, etc., can solve aluminum corrosion, difficulty in maintaining the quality of heat exchangers, and loss of economy, manpower and reputation of aircraft accessory maintenance companies and other problems, to achieve the effect of improving durability and service life, stable and reliable repair effect, and standardizing the gluing process

Active Publication Date: 2021-01-01
山东翔宇航空技术服务有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the heat exchangers on aircraft are mainly plate-fin heat exchangers. Most of the heat exchanger partitions and fins are made of very thin aluminum plates. Fluids containing corrosive particles are easy to corrode aluminum and easily cause heat exchange. The internal leakage of the core exceeds the standard, and secondly, cracks and aging caused by local heating and vibration are also likely to cause the internal leakage of the heat exchanger core to exceed the standard
If the damage to the core of the heat exchanger does not exceed 10% of the total surface area, it can be repaired by applying glue. However, it is difficult to guarantee the maintenance quality of the heat exchanger and obtain reliable sealing performance by using the conventional glue application method.
Once there is an accident of heat exchanger glue disengagement, it will bring serious safety hazards to the operation of aircraft flights, and cause serious losses to the economy, manpower and reputation of aircraft accessory maintenance companies.

Method used

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  • A glue coating process for aircraft heat exchanger
  • A glue coating process for aircraft heat exchanger
  • A glue coating process for aircraft heat exchanger

Examples

Experimental program
Comparison scheme
Effect test

Embodiment １

[0034] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0035] Such as figure 1 Shown, a kind of heat exchanger gluing process of the present invention comprises the following steps:

[0036] (1) Complete the pretreatment of the glued part of the heat exchanger and clean the heat exchanger;

[0037] (2) Preparation of high temperature sealant;

[0038] Preparation of a high temperature sealant involves the following steps:

[0039] (a) Mix epoxy resin and aluminum resin and stir for not less than 3 minutes to obtain component A, and the stirring speed is 100-150 rpm;

[0040] (b) Mix the curing agent and glass fiber and stir for not less than 3 minutes to obtain component B, and the stirring speed is 100-150 rpm;

[0041] (c) Mix component A and component B and stir for not less than 5 minutes at a stirring speed of 100-150 rpm;

[0042] Described epoxy resin is shell epoxy resin 828; Described...

Embodiment 2

[0049] The ratio of raw materials and process temperature control are respectively:

[0050] The weight ratio of epoxy resin to aluminum resin is 100:142; the weight ratio of curing agent to glass fiber is 85:140; the weight ratio of epoxy resin in component A to curing agent in component B is 100:90. The temperature of the heat exchanger is kept at 122°C during glue coating; the curing time is 0.5 hours at room temperature; the baking temperature of the oven is 135°C, and the curing time is 1.5 hours.

[0051] The gluing step is the same as in Example 1.

Embodiment 3

[0053] The selection and proportioning of the raw materials are as follows:

[0054] The weight ratio of epoxy resin to aluminum resin is 100:139; the weight ratio of curing agent to glass fiber is 85:135; the weight ratio of epoxy resin in component A to curing agent in component B is 100:85. The temperature of the heat exchanger is kept at 119°C during the glue coating; the curing is at room temperature for 1 hour; the baking temperature of the oven is 145°C, and the curing is for 1 hour.

[0055] The gluing step is the same as in Example 1.

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Abstract

The invention discloses a gluing process of an aircraft heat exchanger. After pretreatment of a gluing part of the heat exchanger is completed, a high temperature sealant made of epoxy resin, aluminumresin, a curing agent and glass fibre is painted on a core leakage zone of the heat exchanger; then through the gluing treatment of the leakage portion of tube plate corners, after room temperature standing curing, the aircraft heat exchanger can be solidified in an oven. The gluing process of the aircraft heat exchanger has the advantages that a component is convenient to obtain, the proceduresare clear and definite and gluing performance is stable and reliable.

Description

technical field [0001] The invention relates to a gluing process, in particular to a gluing process for an aircraft heat exchanger. Background technique [0002] Aircraft heat exchanger is an important element to control the pressure, flow, temperature, humidity, and flow direction of compressed air. It is mainly used in environmental control systems and air source systems in modern aircraft. At present, the heat exchangers on aircraft are mainly plate-fin heat exchangers. Most of the heat exchanger partitions and fins are made of very thin aluminum plates. Fluids containing corrosive particles are easy to corrode aluminum and easily cause heat exchange. The internal leakage of the core exceeds the standard, and secondly, cracks and aging caused by local heating and vibration are also likely to cause the internal leakage of the heat exchanger core to exceed the standard. If the damage to the core of the heat exchanger does not exceed 10% of the total surface area, it can be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B05D5/00B05D3/02C09J163/00C09J11/08C09J11/04
CPCB05D3/0272B05D5/00B05D2301/00B05D2504/00C09J11/04C09J11/08C09J163/00C08L101/00C08K7/14
Inventor 胡惠琴滕朝阳邓广涛田红岩
Owner 山东翔宇航空技术服务有限责任公司