JP2984776B2 - Structure of bent copper pipe for connection - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
About the structure of the pipe for copper pipe to be used for various plumber events of the hot water supply construction and the like.

[0002]

2. Description of the Related Art Conventionally, in various piping works using copper pipes, in order to bend the pipes, straight pipes are connected to each other by an elbow, so that a brazing operation on a construction site is required. However, since work on such a site involves the use of fire, work in a place where the use of fire is dangerous or in a narrow ceiling is dangerous and time-consuming. In addition, since brazing work with nitrogen gas or other inert gas cannot be performed at the site, an oxide film is formed on the inside and outside of the copper pipe, which is mixed in as impurities and causes deterioration of compressor oil and valve cracks. , Which was the cause of the failure.

[0003]

SUMMARY OF THE INVENTION Therefore, the present invention eliminates the need for bending pipes on-site, eliminates the risk of oxide film formation without danger, and efficiently and efficiently connects copper pipes with simple connection work. Can be performed , and of the sealing effect
An object of the present invention is to provide a structure of a large copper pipe for piping.

[0004]

In order to solve the above-mentioned problems, the structure of the bent copper pipe for connection according to the present invention is such that one end of the bent bent copper pipe is provided with a tubular cylindrical body. An external thread is formed on at least a part of the outer circumference, an annular convex ridge is formed on the outer end surface of the tubular cylinder, and an annular V is formed substantially at the center of the convex ridge.
A male connector with a groove is fixed, a flange is provided at the other end of the bent copper pipe at the end of the tubular cylinder, and a U-shaped cross-section is fitted to the outer end surface of the flange with the ridge. An annular recess is formed, a holding connector having an annular V-groove formed substantially at the center of the annular recess is fixedly fastened, and an annular holding portion which is in contact with an inner end surface of a flange of the holding connector is formed at one end. And a nut.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, FIG. 1 is an explanatory view showing an example of a piping drawing of an air conditioning system of a building, FIG. 2 is a partially broken sectional view showing a structure of a bent copper pipe for connection, and FIG. 3 is an enlarged sectional view of a connecting portion. .

In FIG. 1, a copper pipe is laid as shown in FIG. 1 between an indoor unit A and an outdoor unit B of an air conditioner, avoiding obstacles 1a, 1b, 1c and 1d in the building. And In FIG. 1, four bent copper pipes 2a, 2
b, 2c and 2d are sequentially connected via connectors 3 fixed to both ends of each copper pipe. Each copper pipe used here is previously bent at a factory using a bender based on a piping drawing of an air conditioner of a building at a factory. Next, at a factory, connectors are fixed to both ends of each of the bent copper pipes by brazing. The connector brazing operation is performed under an inert atmosphere such as a nitrogen gas or an argon gas. In this way, a bending copper pipe 4 for connection, in which connectors are fixed to both ends, is formed in advance in a factory at a factory. Next, at the piping work site, the connection bent copper pipes 4 are sequentially connected via the connectors 3 fixed to both ends of each copper pipe based on the piping drawing of FIG.

Next, the structure of the bent copper pipe 4 for connection is shown in FIG.
A description will be given based on FIG. A male connector 31 is fixed to one end of the bent long copper pipe 2 by brazing. The male connector 31 has a male screw 5 formed on a part of the outer periphery of the tubular cylinder, an annular ridge 6 formed on the outer end surface of the tubular cylinder, and an annular ridge 6 substantially at the center of the ridge. V-groove 7 is formed. A holding connector 32 is fixed to the other end of the long copper pipe 2 by brazing. The presser connector 32 has a flange 8 provided at an end of the tubular body, and an annular concave portion 9 formed on the outer end surface of the flange 8 to be fitted to the annular ridge 6 formed on the male connector. An annular V-groove 10 is formed substantially at the center of the recess 9 at a position facing the V-groove 7 formed on the annular ridge of the male connector. And both connectors 3
A fastening nut 11 for tightening and connecting the first and second nuts 32 forms an annular holding portion 13 that comes into contact with the inner end surface 12 of the flange 8 of the holding connector 32, and is formed on the inner circumference of the nut 11 and on the outer circumference of the male connector. Female screw 14 to be screwed to the formed male screw.

Next, the structure of the connecting portion of the copper pipe will be described with reference to FIG. The male connector 31 fixed to the end of the above-mentioned bent copper pipe for connection is opposed to the press connector 32 fixed to the end of another bent copper pipe to be connected. A packing 15 having an appropriate elasticity is attached to the annular recess 9 formed on the end face, and the annular ridge 6 formed on the male connector is fitted into the annular recess 9 of the holding connector via the packing 15, and a fastening nut is provided. The female screw 14 of the fastening nut is screwed into the male screw 5 of the male connector while the annular holding portion 13 of 11 is in contact with the inner end face 12 of the flange, thereby connecting the bent copper pipes for connection. As described above, the male connector and the presser connector are opposed to each other, and the male connector can be connected only by fitting the annular ridge of the male connector into the annular recess of the presser connector and tightening it with the fastening nut.

When the fastening nut 11 is tightened, the packing 15 is pressurized and bites into each of the V-grooves 7, 10.
As a result, the contact area is increased, the packing can be effectively used, and the sealing effect is large. Conventionally, as shown in FIG. 4, an annular ridge 21 formed on an outer end surface of a male connector 20 is merely brought into contact with a tubular step 23 formed on an outer end surface of a holding connector 22, thereby obtaining an annular shape as in the present invention. Since it is not a structure to be fitted in the concave portion and also has no V-groove formed, if an uneven load is applied to the connecting portion, the connecting portion may be twisted and the packing 24 may become uneven, causing gas leakage. In the present invention, since the annular ridge 6 is fitted into the annular recess 9, there is no twisting. According to such a connection structure, the sealing effect is large, for example, 30 to 5
It is suitable when a high pressure of about 0 kgf / cm ² is applied.

The present invention is particularly effective for piping a long copper pipe having a large diameter, for example, a diameter of about 16 to 42 mm. That is, in the case of a large-diameter copper pipe, it is extremely difficult to bend on site, and it is necessary to connect the straight copper pipe by brazing using an appropriate elbow or the like. Since it cannot be performed in an active atmosphere, an oxide film is formed on the inner and outer surfaces around the brazed portion. In the present invention, a copper pipe is bent in advance using a bender at a factory, and connectors are fixed to both ends of the copper pipe at the factory by brazing under an inert atmosphere. No oxide film is formed on the inner and outer surfaces of the copper pipe.

[0011] The material of the long copper pipe used in the present invention is a copper pipe having good spreadability, which is unlikely to be constricted or cracked by bending, for example, a phosphorus-deoxidized copper pipe (having a phosphorus content of 0.0
About 1 to 0.04%, with the balance being copper).

[0012]

As is apparent from the above description, according to the structure of the copper pipe for piping of the present invention, it is unnecessary to bend the pipe on site, it is safe without danger, and an oxide film is generated. without connection work is very easy, you can ensure high sealing effect can be suitably used in the high-pressure of such pipes.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an example of a piping drawing of an air conditioning facility of a building.

FIG. 2 is a partially crushed sectional view showing the structure of a bent copper pipe for connection.

FIG. 3 is an enlarged sectional view of a connecting portion.

FIG. 4 is an enlarged sectional view of a connecting portion having a conventional structure.

[Explanation of symbols]

 2a, 2b, 2c, 2d Curved copper pipe 3 Connector 4 Curved copper pipe for connection 5 Male screw 6 Annular ridge 7 Annular V groove 8 Flange 9 Annular concave part 10 Annular V groove 11 Fastening nut 12 Inner end face 13 Annular holding Part 14 Female screw 15 Packing 31 Male connector 32 Holding connector

Claims (1)

(57) [Claims] A male screw is formed at one end of a bent copper pipe at least at a part of an outer periphery of a tubular cylinder, and an annular ridge is formed on an outer end surface of the tubular cylinder. A male connector having an annular V-groove formed substantially at the center of the ridge is fixedly attached, a flange is provided at the other end of the bent copper pipe at the end of the tubular cylinder, and an outer end surface of the flange is provided. An annular concave portion having a U-shaped cross section that fits into the convex ridge is formed, and a holding connector having an annular V-shaped groove is fixed substantially at the center of the annular concave portion, and the holding connector is fitted to the inner end surface of the flange of the holding connector. A structure of a bent copper pipe for connection, comprising a fastening nut having an annular holding part formed at one end thereof in contact therewith.