CN200988075Y

CN200988075Y - Mouth expander for welding tube mouth forming of heat exchanger

Info

Publication number: CN200988075Y
Application number: CN 200620065512
Authority: CN
Inventors: 欧阳晓平
Original assignee: Guangdong Kelong Electrical Appliances Co Ltd
Current assignee: Guangdong Kelong Electrical Appliances Co Ltd
Priority date: 2006-10-13
Filing date: 2006-10-13
Publication date: 2007-12-12
Anticipated expiration: 2016-10-13

Abstract

The utility model relates to a welding pipe port forming and spreading device for the heat exchanger, which includes a conical port spreading part (1) with a certain cone angle A, a cylinder (2) and a cylinder (3) connected with the large diameter port of the port spreading part (1), a cone (4) with a certain cone angle B connected with the cylinder (3). The scope of the cone angle A is between 18 DEG and 28 DEG. The scope of the cone angle B is between 20 DEG and 30 DEG. The copper pipe is easy to enter, since the contacting area of the port spreading part and the pipe port decreases, which decreases the friction to the pipe port, the heat exchanger copper pipe will not be drawn broken by the port spreading device due to larger friction, so as to improve the heat exchanger welding pipe port forming quality, and improve the product qualified rate.

Description

Heat exchanger welding mouth of pipe moulding mouth expander

Technical field

The utility model relates to metal tube processing unit, particularly relates to a kind of heat exchanger welded pipe moulding mouth expander.

Background technology

Heat exchanger, is made up of the pipeline of a plurality of fin that distribute at regular intervals and the above-mentioned fin of perforation in order to carry out heat exchange with the external world as the heat-exchanging part of air-conditioner.Have the medium that flows in the pipeline of heat-exchanging part of above-mentioned-cylinder structure and carry out heat exchange by a plurality of fin and the external world, the work that the forming quality of its heat exchanger welding mouth of pipe is directly connected to heat exchanger moves.

As shown in Figure 1, existing heat exchanger welded pipe moulding mouth expander is owing to bigger with the copper pipe contact area, thereby the frictional force that produces is also bigger, causes the curved position of copper pipe, heat exchanger bottom to be out of shape; And top copper pipe soldering opening Forming Quality is relatively poor, influences mouth of pipe welding quality, even directly causes heat exchanger to be scrapped.

Because mouth expander pressure pipe oral area position angle of taper directly influences heat exchanger welding mouth of pipe Forming Quality, so the optimal design of mouth expander angle of taper is most important to heat exchanger welding mouth of pipe Forming Quality.If cone angle value too senior general influences heat exchanger welding mouth of pipe Forming Quality; If too little, heat-exchanger brass pipe can be pulled off by mouth expander, causes product rejection.

Summary of the invention

The purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art, a kind of heat exchanger welded pipe moulding mouth expander is provided, this heat exchanger welded pipe moulding mouth expander can reduce the workpiece contact friction force in forming process, thereby improve the Forming Quality of the heat exchanger welding mouth of pipe, improve the shaped article qualification rate.

In order to solve the problems of the technologies described above, the utility model is achieved through the following technical solutions: heat exchanger welded pipe moulding mouth expander of the present utility model comprises: with the expansion mouth of the cone shape of certain cone angle A, also comprise first cylinder and second cylinder that link to each other with expansion mouth major diameter mouth place, the cone of the certain cone angle B of band that links to each other with second cylinder.

The scope of described cone angle A be 18 the degree to 28 the degree, the scope of cone angle B be 20 the degree to 30 the degree.

As further improvement of the utility model, the diameter of described second cylinder 3 is less than first cylinder 2.

As further improvement of the utility model, the axial length of described first cylinder 2 is less than second cylinder 3.

In the utility model, carry out design and optimization by structure and parameter to described mouth expander, make it in heat exchanger welded pipe forming process, reduce positive pressure, avoid the curved position distortion of heat exchanger bottom metal pipe.

Compared with prior art, the beneficial effects of the utility model are:

In the heat exchanger welded pipe moulding mouth expander described in the utility model, because enlarging position and mouth of pipe contact area reduce in forming process, the frictional force that the mouth of pipe is subjected to reduces, heat-exchanger brass pipe can not pulled off by mouth expander greatly because of frictional force, thereby improve heat exchanger welding mouth of pipe Forming Quality, improve product percent of pass.

Description of drawings

Fig. 1 is the front view of this prior art heat exchanger welded pipe moulding mouth expander;

Fig. 2 is the front view of the utility model heat exchanger welded pipe moulding mouth expander;

Fig. 3 is the work schematic diagram of the utility model heat exchanger welded pipe moulding mouth expander.

The specific embodiment

As shown in Figure 2, the utility model heat exchanger welded pipe mouth expander, comprise expansion mouth 1 with the cone shape of certain cone angle A, first cylinder 2 and second cylinder 3 that link to each other with expansion mouth 1 major diameter mouth place, the cone 4 of the certain cone angle B of band that links to each other with second cylinder 3, the diameter of second cylinder 3 is slightly less than first cylinder 2, and the axial length of described first cylinder 2 is less than second cylinder 3.Described cone angle A is 21 degree, and cone angle B is 24 degree.

As shown in Figure 3, mouth expander at work under the external force effect its expansion mouth 1, cone 4 be pressed in the heat-exchanger brass pipe mouth, after the moulding of heat-exchanger brass pipe mouth, little U bend pipe is inserted the refrigerant circulation circuit that the heat-exchanger brass pipe mouth welding back of being made up of refrigerant circulation copper pipe and heat radiation aluminium foil becomes a sealing.

Claims

1. a heat exchanger welds mouth of pipe moulding mouth expander, comprise expansion mouth (1) with the cone shape of certain cone angle A, it is characterized in that: also comprise first cylinder (2) and second cylinder (3) that link to each other with expansion mouth (1) major diameter mouth place, the cone (4) of the certain cone angle B of band that links to each other with second cylinder (3).

2. heat exchanger welding mouth of pipe moulding mouth expander according to claim 1, it is characterized in that: the scope of described cone angle A is that 18 degree are to 28 degree.

3. heat exchanger welding mouth of pipe moulding mouth expander according to claim 1, it is characterized in that: the scope of cone angle B is that 20 degree are to 30 degree.

4. according to claim 2 or 3 described heat exchanger welding mouth of pipe moulding mouth expanders, it is characterized in that: the diameter of described second cylinder (3) is less than first cylinder (2).

5. heat exchanger welding mouth of pipe moulding mouth expander according to claim 4, it is characterized in that: the axial length of described first cylinder (2) is less than second cylinder (3).