JPH10141556A - Pipe joint and application method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a corrosion-proof pipe joint which is capable of reducing the number of component items and reducing man-hours required for a work using bent parts even when many branches, bent parts exist in a piping. SOLUTION: The corrosion-proof pipe joint consists of a union collar 11 having a female screw 111 threaded onto a male screw formed on the outer surface of one end of a metal pipe, a union nut 12 having a bag-like part 121 engagingly locked to a collar 112 of the union collar 11, and a metal pipe joint body 13, on a connection part at least on one end of which a male screw part 131 threaded into a nut 122 of the union nut 12 is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint and a method of installing the pipe joint.

[0002]

2. Description of the Related Art A lining steel pipe in which a tough steel pipe is coated with a corrosion-resistant resin layer or the like is often used for a water supply pipe or a drain pipe. For such pipe joints, such as cheeses and elbows, for connecting such lining pipes, those having both toughness and corrosion resistance in which a resin layer or the like is coated on the inner surface of the joint body are often used.

FIG. 5 is a partially cutaway sectional view showing an example of a conventional cheese in which a resin layer is lined on the inner surface of a joint body. a is a resin nut, which can be screwed with the inner resin coating tube. Reference numeral b denotes a resin insulating layer, and c denotes an O-ring, both of which prevent a liquid from entering through a gap between the screwed portions and thereby prevent the joint body from being corroded.

[0004] However, when piping is performed using such lining steel pipes and pipe joints, the number of parts increases particularly at pipe branching and bending where there are many pipes such as water supply, hot water supply, and cooling / heating pipes. Construction man-hours increase. In particular, it is necessary to connect the elbow or cheese and the union with a straight pipe, which leads to an increase in the number of parts and the number of man-hours for construction.

[0005] In view of the above, there has been proposed a method of reducing the number of joints by bending the lining steel pipe, for example, by bending the pipe (Japanese Patent Laid-Open No. 8-145237). However, in this method, if the lining steel pipe must be piped after the pipe joint has been piped, the bent pipe must be rotated, and in that case, other pipe materials such as a meter In many cases, it was difficult to construct, for example, pipes could not be installed.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and reduces the number of parts by using a metal bent pipe even in a place where the piping has many branches and bends. It is an object to provide a pipe fitting that can be reduced.

[0007]

According to a first aspect of the present invention, there is provided a pipe joint having a union flange having a female screw screwed with a male screw formed on an outer surface of one end of a metal pipe, and the union. It comprises a union nut having a bag portion which is locked to the brim of the brim, and a metal joint main body in which a male screw portion screwed to the nut of the union nut is formed at least at a connection portion at one end.

As the above-mentioned metal pipe, a conventionally known metal pipe such as a steel pipe, a stainless steel pipe, a copper pipe, and an aluminum pipe can be used, but from the viewpoint of corrosion resistance and cost, an inner resin-coated pipe having an inner surface coated with a resin layer is used. Is preferred.

Further, when an inner resin-coated tube is used as the metal tube, a resin is formed on the end surface of the joint body on the side where the male screw portion is formed so that the inner resin-coated tube has substantially the same diameter as the connected inner resin-coated tube. It is preferable that the union brim is provided with a resin-made tube end core so as to seal the tube end when the inner surface resin-coated tube is connected. A corrosion-resistant pipe having excellent corrosion resistance can be obtained.

[0010] According to a second aspect of the present invention (the present invention 2), a metal bent pipe is joined after piping the pipe joint according to the first aspect.

(Operation) The pipe joint according to the first aspect of the present invention has a union flange having a female screw screwed with a male screw formed on an outer surface of one end of a metal pipe, and a bag portion engaged with the flange of the union flange. A union nut having a male screw portion to be screwed with the nut of the union nut is formed at at least one connection portion, so that the pipe can be branched, bent or bent even after the pipe joint has been piped. A bent pipe can be joined, and the number of parts can be reduced.

The method for installing a pipe joint according to the second aspect of the present invention is described in claim 1.
Since the metal bent pipe is joined after the pipe fitting described above is piped, the number of parts can be reduced even in a place where the pipe is branched and bent frequently.

[0013]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of a pipe joint 1 according to the first embodiment of the present invention. 11 is a union flange, 12 is a union nut, 1
Reference numeral 3 denotes a joint body.

The union flange 11 includes a female screw 111 screwed with a male screw formed on the outer surface of one end of a metal tube (not shown) to be connected, a flange 112, and a tube end core 113. The tube end core 113 is formed of resin so that when a metal tube is connected, the tube end can be sealed. The packing 14 is inserted into the tube end core 113 so that it can be brought into contact with the tube end when a metal tube is connected, thereby protecting the tube end.

The union nut 12 comprises a bag portion 121 which is engaged with the collar 112 of the union collar 11, and a nut 122. Further, a packing 15 is inserted into the bag portion 121, and the nut 122 and the male screw portion of the joint body 13 are provided. When the screw 131 is screwed, the distal end of the male screw 131 abuts and can be sealed.

The joint body 13 is made of cheese. One end is formed with a male screw portion 131 screwed to the nut 122 of the union nut 12. The other end has a normal cheese structure. And a metal tube (not shown). Each end is covered with a resin layer 133 so as to have substantially the same diameter as the inner diameter of the metal tube to be connected.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a pipe joint according to the present invention will be described with reference to the drawings. (Embodiment 1) FIG. 2 is a three-dimensional piping diagram (perspective view) showing a water supply pipe of an apartment house showing an example of a use mode of the pipe joint of the present invention.
It is. The pipe branched from the water supply main pipe 2 by the pipe joint (cheese with a union) 1 of the present invention is adjusted through a metal bent pipe 3, a valve 4, a straight pipe 5, a pressure reducing valve 6, and the metal bent pipe. 3, a water meter 7, a metal bent pipe 3, and a cheese 1 with a union. One of the pipes is connected to a water supply line 8, and the other is connected to a water heater 9 through the metal bent pipe 3.

The parts used in this example are, starting from the water supply main pipe 2, two cheeses with a union, four metal bent pipes,
There were one straight pipe, one valve, one pressure reducing valve, and one water meter, and the number of connection points was eleven.

(Comparative Example 1) As shown in FIG.
Example 1 is the same as Example 1 except that the measurement was performed using 101 and the unions 102 and 102. The parts used in this example are two cheeses, two unions,
There were four bent metal pipes, three straight pipes, one valve, one pressure reducing valve, and one water meter, and 15 connection points.

(Comparative Example 2) As shown in FIG. 4, a water supply pipe was formed using straight pipes 5,... 5 and elbows 111,. Except for this, it is the same as Comparative Example 1. The parts used in this example are 2 cheeses, 2 unions, 6 elbows,
There were 11 straight pipes, one valve, one pressure reducing valve, and one water meter, and 23 connection points.

[0021]

Since the pipe joint of the present invention has the above-described structure, a bent metal pipe can be joined even in a place where there is a large amount of branching or bending of the pipe, or even after the pipe joint has been piped, thereby reducing the number of parts. be able to.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a pipe joint of the present invention.

FIG. 2 is a three-dimensional piping diagram showing the first embodiment of the present invention.

FIG. 3 is a three-dimensional piping diagram showing Comparative Example 1.

FIG. 4 is a three-dimensional piping diagram showing Comparative Example 2.

FIG. 5 is a partially cutaway sectional view showing an example of a cheese in which a resin layer is lined on the inner surface of a joint main body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipe joint 11 Union collar 111 Female thread 112 Collar 12 Union nut 121 Bag part 122 Nut 13 Joint body 141 Male thread part 3 Metal bent pipe 13 Joint body 14 Male thread part

Claims (2)

[Claims] 1. A union flange having a female screw threadedly engaged with a male screw formed on an outer surface of one end of a metal tube, a union nut having a bag portion engaged with the flange of the union collar, and the union A pipe joint, characterized in that a male screw part to be screwed with the nut of the nut comprises a metal joint body formed at least at a connection part at one end. 2. After piping the pipe joint according to claim 1,
A method for installing a pipe joint, comprising joining a metal bent pipe.