JPH02309089A - Connecting method for pipe - Google Patents

Abstract

PURPOSE:To improve the connection workability of pipes and stabilize the flow of a heat medium in the pipe by connecting a large-diameter pipe provided with a lower hole for inserting a small-diameter pipe and the small-diameter pipe formed with a hem to be brought into contact with the large-diameter pipe on the periphery near the tip. CONSTITUTION:In a large-diameter pipe 2 provided with a lower hole 2a for inserting a small-diameter pipe 1 and the small-diameter pipe 1 formed with a hem 1a to be brought into contact with the outer face of the large-diameter pipe 2 on the periphery near the tip and provided with curvature machining at the tip section protruded in the large-diameter pipe 2, the tip section of the small-diameter 1 is inserted into the lower hole 2a of the large-diameter 2, and they are connected while the hem 1a is kept in contact. The connection workability of pipes is improved, and the flow of a heat medium in the pipe is stabilized. The airtightness and strength at the connected portion of pipes are stabilized, and quality can be secured.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for connecting pipes for freezing/refrigerating equipment and air conditioning equipment.

Conventional technology In recent years, pipe connection methods have improved work efficiency and airtightness.
In terms of strength, stable quality is required, and a variety of types are used.

Hereinafter, the above-mentioned conventional pipe connection method will be explained with reference to the drawings.

Figures 3 and 4 show a perspective view and a sectional view of a first example of a conventional pipe connection method. In Figures 3 and 4, 3 is a small diameter pipe, 2 is a large diameter pipe, and 2a is a pilot hole. .

1 and 6 show a perspective view and a sectional view of a second example of a conventional pipe connection method.

In Fig. 6, 4 is a small diameter pipe, 5 is a large diameter pipe, 4b is a saddle-shaped portion formed by machining the tip of the small diameter pipe 1 into a trumpet shape and is in contact with the outer surface of the mating large diameter pipe 2, and 6a is a lower part. It's a hole.

A heat medium (not shown) flows in the tube at the tube connection portion configured as described above, and when the tube has a plurality of connection portions, the heat medium separates and gathers.

Problems to be Solved by the Invention However, in the configuration of the first example of the conventional pipe connecting method, when connecting the small diameter pipe 3 and the large diameter pipe 2, there is no positioning of the small diameter pipe 3 in the insertion direction, and the insertion dimension is Because the flow was not constant, the flow of the heat medium (not shown) inside the pipe changed and became unstable2.Also, the contact area between the small diameter pipe 3 and the large diameter pipe 2 was only around the prepared hole 2a of the large diameter pipe 2. However, it was difficult to ensure sufficient contact area in terms of airtightness and strength, and it was not possible to provide a tube with stable performance.

Next, in the configuration of the second example, when connecting the small diameter pipe 4 and the large diameter pipe 5, the contact area between the small diameter pipe 4 and the large diameter pipe 6 is
The airtight surface 2 is ensured by the strength of b, but the large diameter pipe 6
0 No positioning means in the circumferential direction or longitudinal direction, small diameter pipe 4
Since the position of the inside of the pipe and the prepared hole 6a of the large diameter pipe 6 cannot be machined at a constant constant position, the prepared hole 5a is blocked by the saddle shape 4b, which causes a change in the flow of the heat medium (not shown) inside the pipe. It had a division.

In view of the above-mentioned problems, the present invention provides a large-diameter tube having a prepared hole on the circumference for inserting a small-diameter tube, and a rim formed on the circumference near the tip so as to contact the outer surface of the large-diameter tube. In particular, the present invention provides a method for connecting tubes by stabilizing the flow of a heat medium within the tubes and ensuring a sufficient contact area between the small diameter tube and the large diameter tube in terms of airtightness and strength.

Means for Solving the Problems In order to solve the above problems, the pipe connection method of the present invention includes: a large diameter pipe having a prepared hole on its circumference for inserting a small diameter pipe;
The present invention has a structure in which a rim is formed on the circumference near the tip so as to contact the outer surface of the large-diameter pipe and connect it to the small-diameter pipe. This improves workability, stabilizes the flow of the heat medium inside the tube, stabilizes the strength of the airtight surface 2 at the connecting portion of the tube, and ensures quality. .

EXAMPLE Hereinafter, a method for connecting pipes according to an example of the present invention will be described with reference to the drawings.

FIGS. 1 and 2 show a perspective view and a sectional view of a method of connecting pipes in an embodiment of the present invention.

1 is a small-diameter pipe, 2 is a large-diameter pipe, 1a is a rim, and 1c is a curved surface processing provided at the tip, and in this embodiment, it is circular processing that is concentric with the large-diameter pipe. 2a is a pilot hole.

A large diameter pipe 2 is provided with a prepared hole 2a on the circumference for inserting the small diameter pipe 1, and a rim 1a is formed on the circumference near the tip so as to contact the outer surface of the large diameter pipe 2. 2 is connected to a small diameter tube 1 having a curved surface 1c at the tip protruding inside.

The heat medium (not shown) in the tube flows at the connection portion of the tube configured as described above, and when the tube has a plurality of connection portions, the heat medium separates and gathers.

At this time, the insertion dimension of the small diameter tube 1 inserted into the large diameter tube 2 is fixed with the edge 1a serving as the positioning. .

Since the edge 1a of the small diameter tube 1 contacts the outer surface of the large diameter tube 2, a contact area between the small diameter tube 1 and the large diameter tube 2 can be secured. Furthermore, curved surface processing 1 provided at the tip of the small diameter pipe 1
Even when the difference in outer diameter between the small-diameter tube 1 and the large-diameter tube 2 is small, the protrusion of the small-diameter tube 1 into the large-diameter tube 2 can be suppressed, and an increase in pressure loss within the tube of the heat medium can be prevented.

As described above, according to this embodiment, the workability of connecting the pipes is improved, the flow of the heat medium in the pipes is stabilized, the variation and increase in pressure loss in the pipes is prevented, and the airtight surface 9 strength of the joint part of the pipes is improved. The surface is stable and quality can be ensured.

Effects of the Invention As described above, the present invention provides a large-diameter tube with a bottom opening on the circumference for insertion of a small-diameter tube, and a rim formed on the circumference near the tip so as to contact the outer surface of the large-diameter tube. By connecting small-diameter pipes, the workability of connecting the pipes is improved, the flow of the heat medium inside the pipes is stabilized, and the airtight surface 2 strength of the joints of the pipes is stabilized.
Quality can be ensured.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a pipe connection method according to an embodiment of the present invention, FIG. 2 is a sectional view of a pipe connection method according to an embodiment of the present invention, and FIG. 3 is a first example of a conventional pipe connection method. Perspective view, 4th
The figure is a cross-sectional view of a first example of a conventional pipe connection method, FIG. 5 is a perspective view of a second example of a conventional pipe connection method, and FIG. 8 is a cross-sectional view of a second example of a conventional pipe connection method. . 1...Small diameter pipe, 2...Large diameter pipe, 1a.
... Edge, 2a ... Pilot hole. Name of agent: Patent attorney Shigetaka Awano and 1 other person
1a? Figure 3 Figure 4

Claims (1)

[Claims] It is characterized by connecting a large diameter tube with a prepared hole on the circumference for inserting the small diameter tube, and a small diameter tube by forming a rim on the circumference near the tip that contacts the outer surface of the large diameter tube. How to connect pipes.