JPS58209436A - Manufacture of heat exchanger - Google Patents

Abstract

PURPOSE:To separate air foam of gas existing in a brazing material, and to improve the fluidity of the brazing material, by giving a slight vibration while brazing, when constituting a heat exchanging pipe by brazing a pipe body and a bend. CONSTITUTION:Brazing is executed by igniting burners 7, 7 and heating the fitted part of a U pipe and an R bend 5. At the same time, an ultrasonic wave oscillating machine 10 is operated, and ultrasonic vibration amplified by an amplifier 11 is transferred to fins - through a vibrator 9. The ultrasonic vibration is transferred to the brazed part of the U pipe 4 and the R bend 5 from the fins -, and a brazing material which flows in is slightly vibrated. Each air foam of fume-like gas existing in the brazing material collides with each other or is combined by the slight vibration. Accordingly, the brazed part is packed with only the brazing material and no air foam exists, therefore, a leak test is not required, and even if this product is used for a refrigerating cycle, no refrigerant leaks.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a manufacturing method for a heat exchanger manufactured by Fintochinese, for example, and particularly relates to a method for manufacturing a heat exchanger made by Fintochinese, and in particular, an rIA process in which the ends of a pipe body and a bend are brazed to each other. .

This invention relates to improvements in connecting means.

[Technical background of the invention and its problems]

A fintochip type heat exchanger is incorporated into the refrigeration cycle device. This 1 heat exchanger has a large number of fins arranged side by side with narrow gaps between them, and a heat exchanger that snakes through the fins. The U vibe and the R pend, which are Arrange them and press the fins one after another to create a predetermined number of fins ((-1) so that there are narrow gaps, then fit the open ends of the fc and do into the open ends of the U and ino. , connect by pouring the katsuroki.

Tokoro-CN U 7# Brazing and R bend
When soldering, the solder metal used in the connection is heated and the brazing process is carried out while melting the solder. At this time, heat-like gas is generated from the solder metal melting in the bath. A portion of this gas moves in the form of bubbles within the bathed brazing material, and often remains as minute bubbles (pinholes) when the brazing material cools and hardens. The bubbles cause leakage of the refrigerant flowing through the heat exchanger pipe.

In the past, it was not possible to reduce the air bubbles in the brazing filler metal except by relying on skilled brazing professionals, and it was impossible to eliminate them mechanically, so it was difficult to reduce the number of bubbles in terms of quality. Not stable. Therefore, the assembly work process of the freezing cycle device includes a supplementary work sheet for the leakage point in the two-heat exchanger, which is time-consuming and troublesome.

[Purpose of the invention]

The present invention was developed in view of the above-mentioned circumstances, and its purpose is to reliably eliminate all bubbles in the brazing material that occur during brazing, and to significantly reduce brazing leakage. The present invention aims to provide a method for manufacturing a heat converter that improves manufacturing quality.

[Hotel for inventions]

In the present invention, air bubbles generated in the brazing material are floated and separated by applying micro vibrations such as ultrasonic vibrations to the heat exchange effect while processing the connection parts of the heat exchanger wire. It is designed to have a defoaming effect.

[Practical example of the invention] DESCRIPTION OF THE PREFERRED EMBODIMENTS Practical examples of the present invention will be explained below based on the drawings.

Figure 1 shows a finned tube type heat exchanger. This is the number 1. A large number of fins, which are extremely thin board pieces, are placed in a narrow gap.
Figure out 2. ◇ Pass the heat exchange pipe f3 meanderingly through the end plates 2, 2 and the fins to form a heat converter. The U pipe 4... and the R pipe 5 are connected and integrated into one.

As shown in Fig. 2, the open end of the U/4' inno 4 protrudes from the end plate 2 and is expanded so that the diameter is slightly rounded, and the upper iR bend 5 is attached to this end.
The ends of the two are tied together, and a brazing filler metal 6 is poured into the gap between them to connect and fix.

Actually, this is done as shown in FIG. That is, it is attached to the fin, the end plate 2, and the 2iU pipe 4, and supported by the support f5. However, the open end of the U pipe 4 is directed upward, and the R bend 5 is fitted therein. A burner 2.degree. 7 provided on the support device k5 faces i' to these fitting portions. Further, the vibrator 9 of the ultrasonic device 8 is brought into contact with a part of the tip. The ultrasonic wave device 8 is constructed by connecting an ultrasonic oscillator 10, an amplifier II, and the vibrator 9 in series.

However, burner 7.7 ignites and U.? The fitting portion between the eve 4 and the R pend 5 is heated. So(.

Then, the melted brazing filler metal 6 is poured between these and the brazing process is performed. As shown in Fig. 4, some gas is generated from the filled brazing filler metal 6. The ultrasonic oscillator 10 is activated almost simultaneously with the start of processing the brazing material, and the ultrasonic vibration amplified by the amplifier 11 is transmitted to the fins via the vibrator 9. The ultrasonic vibrations are also transmitted from the fin... to the soldering part between the soldering material 6 and the soldering material 6, and the flowing soldering material lIj vibrates slightly.Then, the air bubbles of the heme-like gas existing in the soldering material 6 ( (pinholes) mutually collide or coalesce due to the formation of capacitance caused by minute vibrations.Even if a predetermined amount of brazing filler metal 6 is poured to fill the above gap, the ultra-single-wave vibration action continues.Brazing filler metal 6 All the air bubbles inside are removed (and degassed to separate them).

(How many molecules jr, I fill only the brazing filler metal 6, and there are many air bubbles?)
There is a refrigerant boost with shell C, hanging o# Twicle e (even if you use refrigerant leak, i 1. It is also possible to use the ultrasonic device 8 to apply ultrasonic vibrations to the VCt, or alternatively to apply vibrations instead.

[Effects of the invention] ] The present invention - How many parts can be used to connect a piino body and a bend?
When configuring one heat exchanger and one ino, how many of the above waxes are required?
Since we applied micro vibrations such as ultrasonic vibrations during the initial process, we were able to float and separate the bubbles of heam-like gas that exist in the solder metal, improving the fluidity of the wax phase and preventing leaks. It is possible to obtain prevention and improve quality.Furthermore, the leak test process fL can be simplified, contributing to cost reduction.

i4. The simple cut-away drawings show one embodiment of the present invention, FIG. 1 is a perspective view of the heat exchanger, FIG. 2 is a partially cutaway side view of the main parts, and
Figures 1 to 3 are enlarged views of the main parts, and Figure 3 is a top view showing the manufacturing means of the heat exchanger. ), 5...(f
t) Bend, 8... Ultrasonic device, 9... Vibrator.

Applicant representative Patent attorney Suzue Takehiko Figure 1 Figure 2 ,3

Claims (1)

[Claims] For those with heat exchange pipes passing through the fins, the above heat exchange? Eve connected 7941 bodies and Bend,
A method for manufacturing a heat exchanger, characterized in that the heat exchanger is poisoned with micro vibrations such as ultrasonic vibrations while brazing the connecting portions of the 247 bodies and the bends.