JPS6016873Y2 - Double tube type find tube - Google Patents

Description

[Detailed description of the invention] The present invention relates to a double-pipe type find tube in which an inner pipe is piped within an outer pipe and each pipe is used as a mutually independent circuit, and is particularly suitable for preventing brazing defects. Regarding the double tube type find tube.

Conventionally, an inner tube 2 is inserted into an outer tube 1 as shown in FIG. A double-pipe type find tube in which a linear brazing material 4 is arranged at both joint ends and connected by furnace brazing to increase pressure resistance is generally known.

However, in the conventional find tube, the brazing material 4 is only placed on the joint end of the inner tube 2 and the reinforcing material 3, as shown in Fig. It is not easy to fix, and especially when the brazing material 4 has deformation such as bending, there is a problem that poor brazing is likely to occur.

The present invention was devised to solve these conventional problems, and its purpose is to provide a double-pipe type find tube that can prevent poor brazing.

The present invention provides at least two parts of the inner pipe that are separated from the outer pipe, and a groove is formed in each of the parts that are separated from each other, and the end of the reinforcing material is inserted into the groove. By forming a space into which a shaped brazing material can be inserted, and inserting the brazing material into this space, the brazing material can be reliably fixed at the location where the brazing material is to be joined.

The present invention will be explained below based on an embodiment shown in FIGS. 2 to 4.

In FIGS. 2 and 3, 11 is a cylindrical outer tube, and inside this outer tube 11, the upper and lower ends are in contact with the outer tube 11, and both sides are curved inward and separated from the outer tube 11. Inner tube 12
is inserted and arranged, and as shown in FIG.
2 and 2 are configured with mutually independent pipe lines.

As shown in FIG. 2, outwardly curved grooves 15 are formed on both side walls of the vertically central portion of the inner tube 12, and between the opposing grooves 15, the central portion protrudes upward. A reinforcing member 13 having a hat-shaped cross section is inserted.

A linear brazing material 14 is inserted in the axial direction into a space 16 formed by the upper half of the groove 15 and the reinforcing material 13.

The joint portion between the groove 15 and the reinforcing material 13 is connected by furnace brazing to increase the pressure resistance.

On the outside of the outer tube 11 configured in this way, a large number of fins are provided at required intervals in the axial direction.

Next, the effect will be explained.

When installing the reinforcing material 13, first install the groove 1 of the circular pipe 12.
A reinforcing material 13 is inserted between 5 and 5.

Then, the linear brazing material 14 is inserted into the space 16 formed by the upper half of the groove 15 and the end of the reinforcing material 13.

At this time, since the brazing material 14 is surrounded by the groove 15 and the reinforcing material 13, even if the brazing material 14 is slightly bent, it can be inserted accurately into a fixed position.

Next, the inner tube 12 and the reinforcing material 13 are connected by furnace brazing.

At this time, since the width of the groove 15 is extremely narrow, the distortion during processing of the inner tube 12 is removed by heating during the furnace brazing, and the expansion force of the inner tube 12 due to heating is applied to the reinforcing material 13. Since it acts in the tightening direction, there is no gap between the brazed parts,
The brazing effect can be further enhanced.

As explained above, this embodiment provides the following effects.

(1) Since the brazing material is inserted into the space formed by the groove and the reinforcing material, even if the brazing material is slightly bent, it can be firmly held in place, eliminating brazing defects.

(2) Since the width of the concave groove is extremely narrow, distortion during machining of the inner tube can be removed by heating during furnace brazing.

(3) During brazing in the furnace, the expansion force of the inner tube due to heating acts in the direction of tightening the reinforcing material, so there is no gap between the brazed parts and the brazing effect can be further enhanced.

FIG. 5 shows another embodiment of the present invention, in which a reinforcing material 23 is used in place of the reinforcing material 13 in the previous embodiment.

That is, the reinforcing material 23 is formed in the shape of a flat strip, and at both ends thereof, that is, at positions corresponding to the grooves 15, the ends are cut and raised at required intervals in the longitudinal direction to form claws 1.
8 is formed.

This claw 18 and the upper half of the groove 15 form a space 16.
is formed, and the brazing material 14 is inserted into this space 16.

Even with this configuration, the same effects as in the above embodiment can be expected.

The present invention has been described above based on preferred embodiments, and according to the present invention, brazing defects can be prevented while maintaining good thermal conductivity to the inner tube.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing a conventional example, FIG. 2 is a cross-sectional view showing an embodiment of the present invention, FIG. 3 is a longitudinal cross-sectional view of the same, FIG. 4 is a perspective view of the same, and FIG. FIG. 7 is a cross-sectional view showing another embodiment of the invention. 11...Outer tube, 12...Inner tube, 13,
23... Reinforcement material, 14... Brazing material, 1
6...Space part.

Claims (1)

[Scope of utility model registration request] The inner tube is arranged inside the outer tube so that a part of the outer circumferential surface is joined to the inner circumferential surface of the outer tube, which has a circular cross section, and a reinforcing material is placed inside the inner tube to increase the pressure resistance. In a double-pipe type find tube used as an independent conduit, at least two parts are provided where the inner pipe is separated from the outer pipe, and a groove is formed in each separated part, and the groove is formed in each separated part. A double-pipe find tube characterized in that the end of the reinforcing material is inserted into the groove to form a space into which a linear brazing material can be inserted.