JPH0772595B2 - Pipe fitting - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint whose pipe length is expandable and contractible, and more specifically, after cutting a part of a piped pipe, the pipe is easily attached to the cutting point. Pipe joint that can be.

(Prior art) For example, it is necessary to investigate the corrosion state of the inner surface of the existing pipeline to determine whether it is necessary to replace the pipeline to prevent red water, prevent water leakage, and prevent pipeline blockage. .

Conventionally, a connecting part such as a faucet or a water heater is detached, and an inspection tool such as a fiberscope is inserted into the duct from the opening of the detached duct to inspect the duct. However, the pipes are usually bent, and if there are three or more bends at a substantially right angle in the pipe, the inspection tool cannot be inserted up to the pipe beyond that, and the entire pipe cannot be inserted. Can't investigate. Therefore, in order to investigate the corrosion state of the entire pipeline, it is conceivable to cut multiple arbitrary points in the pipeline (for example, about 10 cm) and insert an inspection tool from the cut end of the pipeline. .
However, in the case of investigating the corrosion state in the pipeline by the conventional method, the ends of the cut pipelines must be connected with good sealing property after the survey in the pipeline.

Conventionally, for example, the following structure has been proposed as a means for connecting the ends of cut pipes.

Cap nuts are attached to the ends of the cut pipes respectively, the left and right cap nuts are pulled by a nut having a reverse screw, and both pipes are seal-coupled using a ball and packing (for example, Japanese Patent Publication No. 45-5305). Issue).

A sheath tube having a reverse thread and a connector screwed to the sheath tube are used, and the sheath tube is rotated to change the connector gap to seal-connect the two conduits (for example, Japanese Utility Model Laid-Open No. 53-153528).

Both pipe lines are seal-joined by using a jointed joint in which the screws provided on the left and right are configured as reverse threads (for example, see Shoukai 62-
35184).

(Problems to be Solved by the Invention) However, since the above and configurations are for connecting while pulling a pair of connecting pipes to be connected, when the connecting pipe is fixed to a structure such as a wall, ,
Not applicable. Further, in the above configuration, it is necessary to process the flange and the ring on the end portion of the connecting pipe, and therefore the workability on site is poor.

The present invention solves the above drawbacks, and its purpose is to:
After cutting the appropriate points of the existing pipeline fixed to the structure etc., when repairing the cut pipeline, a pipe joint that can connect the ends of both pipelines easily and with good sealing property. To provide.

(Means for Solving the Problem) The pipe joint of the present invention includes a joint body having tubular threaded portions on opposite end surfaces of which male threads in opposite directions are formed, and a threaded portion of each of the threaded portions of the joint body. An internal thread capable of screwing with a male thread has a pair of moving joints having a cylindrical threaded portion formed on the inner peripheral surface thereof, and the moving joint is capable of sliding contact with the inner surface of the threaded portion of the joint body. A tubular portion is provided, and a tip end portion of the inner tubular portion is projected from a tip end of the tubular screwing portion, and an outer peripheral surface of a tip end portion of the inner tubular portion is projected from a tip end of the tubular screwing portion. By mounting the packing in the provided groove, the packing is interposed between the outer peripheral surface of the tip of the inner cylinder and the inner peripheral surface of the threaded portion of the joint body, and is connected to the outer end of each moving joint. It is characterized in that a pipe receiving port to which the end faces of the pipe can be joined is formed.

(Operation) In the pipe joint of the present invention, the distal end portion of the inner tubular portion projects beyond the distal end of the tubular threaded portion, and the distal end portion of the inner tubular portion projects beyond the distal end of the tubular threaded portion. Since the packing is mounted in the groove provided on the outer peripheral surface of the inner cylinder, the packing is interposed between the outer peripheral surface of the distal end portion of the inner cylindrical portion and the inner peripheral surface of the threaded portion of the joint body. When the packing is mounted in the groove provided on the outer peripheral surface of the distal end of the portion, the distal end of the inner tubular portion is projected more than the distal end of the tubular screwing portion, and the packing can be easily mounted. .

(Example) Below, the Example of this invention is described in detail.

As shown in FIG. 1, a pipe joint A of the present embodiment includes a joint body 1, a pair of movable joints 2 and 2 mounted on both sides of the joint body 1, a joint body 1 and both movable joints 2. It has a packing 3 interposed therebetween.

The joint body 1 has a nut portion 17 whose outer surface is formed into a nut shape.
On both sides thereof, cylindrical threaded portions 12, 12 having male threads 11a, 11b formed on their outer peripheral surfaces are provided, respectively. The male screws 11a and 11b formed on the outer peripheral surfaces of the threaded portions 12 and 12 are formed in opposite directions. That is, if the male screw 11a formed on one screwing portion 12 is a right screw, the other screwing portion 12 is
The male screw 11b formed on the is formed so as to be a left screw. The inner diameter of the nut portion 17 is set to be slightly smaller than the inner diameters of the screwing portions 12, 12, and a sliding surface 15 is formed on the inner peripheral surface of each screwing portion 12.

The two movable joints 2 and 2 are formed symmetrically. Each moving joint 2 has a cylindrical threaded portion 22 having an internal thread 21 formed on its inner peripheral surface, an inner tubular portion 27 provided inside the threaded portion 22 with a gap, a threaded portion 22 and an inner threaded portion 22. It has a tubular portion 23 provided integrally with the base of the tubular portion 27. The inner diameter of the tubular portion 23 is formed to have the same size as the inner diameter of the inner tubular portion 27, and the inner circumferential surface of the tubular portion 23 and the inner circumferential surface of the inner tubular portion 27 are continuous. A sliding surface 25 is formed on the outer peripheral surface of the inner tubular portion 27, and a concave groove 26 formed in the sliding surface 25
An annular elastic packing 3 is mounted inside. Also,
An insertion groove 30 having an opening on the joint body 1 side is formed between the threaded portion 22 and the inner tubular portion 27.

Therefore, the male threads 11a and 11b of the joint body 1 are screwed into the female threads 21 of the two movable joints 2, and the threaded portion of the joint body 1 is joined.
When 12 is inserted into the insertion groove 30 of both the moving joints 2, 2, the overlapping dimension of the screwing portions 12, 12 of the joint body 1 and the screwing portion 22 of each moving joint 2 changes, so that the joint body 1 and Both moving joints 2, 2
The length of the pipe combined with will change. Even if the pipe length is changed, since the packing 3 is always interposed between the joint body 1 and the sliding surfaces 15 and 25 of the two movable joints 2 and 2, the joint body 1 and the both movable joints 2 are connected to each other. The sealing property of is maintained.

The connecting pipes 4 are provided on the outer end surfaces of the tubular portions 23 of the respective movable joints 2, 2.
End faces of the pipes 28, 28 are formed so that they can be joined to each other with a good sealing property, and annular projections 29, 28 are formed on the end faces of the pipe reception ports 28, 28.
29 are provided integrally. These moving joints 2
The joint body 1 is formed of a synthetic resin material or a metal having excellent corrosion resistance.

Next, for example, an operation for inspecting the inside of a pipe line connected to a water heater with an inspection tool such as a fiberscope and then connecting the cut pipe line with the pipe joint A having the above-described configuration will be described.

As shown in FIG. 1, the connecting pipe 4 constituting the pipe line is formed by providing a synthetic resin layer 6 on the inner surface of a steel pipe 5. The appropriate portion of the connecting pipe 4 is cut at a length in a range longer than the minimum dimension of the pipe length of the pipe joint A and shorter than the maximum dimension of the pipe length of the pipe joint A. Next, the inspection tool is inserted into the connection pipe 4 through the cut end of the connection pipe 4 at this cutting point, and the deterioration, corrosion state, etc. of the inner surface of the pipe line are investigated.

The disconnection point of the connecting pipe 4 is the pipe joint A having the above-mentioned configuration.
Can be used to repair as follows.

As shown in FIG. 1, first, in a state where the length of the pipe joint A is shortened, the pipe joint A is arranged at a cut portion of the connection pipe 4, and the end faces of both the connection pipes 4 and 4 have a substantially cylindrical shape. Install packing 7. This packing 7 is formed by extending a cylindrical piece 7b arranged on the outer peripheral surface of the connecting pipe 4 from the outer end of the ring body 7a arranged on the end surface of the connecting pipe 4, and on the outer surface of the cylindrical piece 7b. A plurality of elastic protrusions 7c are provided. This packing 7
It is made of a slightly elastic synthetic resin material or the like, and is attached so as to cover the end face portion of the adhesive pipe 4 as described above.

Next, the threaded portion 12 of the joint body 1 and the threaded portion 22 of each moving joint 2
At least one of the nut portion 17 of the joint body 1 and the screw portion 22 of the movable joint 2 is relatively rotated so as to release the screw engagement with. Here, when the movable joint 2 is rotated, both the movable joints 2 and 2 are rotated in the same direction. Then, the movable joint 2 and the joint body 1 respectively move in the directions away from each other in the axial direction, and the length of the pipe joint A gradually increases. As a result, as shown in FIG. 2, the pipe receiving ports 28, 28 come into contact with the packing 7 on the end surfaces of the connecting pipes 4, 4 arranged outside the both pipe receiving ports 28, 28 of the pipe joint A, respectively. become. further,
In this state, for example, when the nut portion 17 of the joint body 1 is rotated as described above, the two movable joints 2 and 2 come into contact with the surface of the packing 7 at the end face of the connection pipe 4 and do not rotate and the connection pipe 4 does not rotate.
As a result, the annular projection 29 bites into the packing 7 and the pipe joint 1 and the end face of the connecting pipe 4 are completely sealed. Here, both connection pipes 4 and 4 forming the conduit are fixed to a structure such as a wall,
Since 4 does not move to the outside by the pressure from the pipe receiving ports 28, 28, the pipe receiving ports 28, 28 and the end faces of the connecting pipes 4, 4 are reliably sealed, and as shown in FIG. In addition, the pipe joint A is fixed between the connecting pipes 4 and 4. In FIG. 2, 8 is a wall material and 9 is a joint.

According to the above-mentioned structure, since the pipe line can be cut at an appropriate point and repaired by the pipe joint A, the deterioration of the pipe line can be diagnosed in every corner, and the defective pipe line can be replaced with a new pipe. The pipe joint A can also be used as a pipe joint between the existing connection pipe 4 and the new pipe. Further, since the shape of the pipe joint A is compact, the pipe joint A can be easily attached to the pipe line even in a narrow space. Further, the packing 7 functions as a sealing material between the connecting pipe 4 and the pipe joint A, and at the same time, it is possible to cover the end surface portion of the connecting pipe 4 and prevent water from flowing to the steel pipe 5 portion of the connecting pipe 4, thus preventing rust. Also functions as packing. Further, when the joint body 1 is rotated to extend the pipe length of the pipe joint A, both the movable joints 2 and 2 contact the packing 7 and move to the connecting pipe 4 side without rotating, so that the connecting pipe 4 The packing 7 attached to the end surface of the is not twisted, and a reliable seal by the packing 7 can be expected.

(Effects of the Invention) As described above, according to the pipe joint of the present invention, in the pipe joint of the present invention, the distal end portion of the inner tubular portion projects beyond the distal end of the tubular screwing portion, and the tubular screw Between the outer peripheral surface of the tip portion of the inner tubular portion and the inner peripheral surface of the threaded portion of the joint body by mounting the packing in the groove provided on the outer peripheral surface of the inner tubular portion protruding from the tip of the joint portion. Since the packing is inserted in the inner tube, when installing the packing in the groove provided on the outer peripheral surface of the tip of the inner tube, the tip of the inner tube is more than the tip of the tubular screwing part. Also, it is easy to attach the packing because it is projected.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of an embodiment of the pipe joint of the present invention,
FIG. 2 is an explanatory view of the action of the pipe joint, and FIG. 3 is a schematic diagram showing a connection state of the pipe joint to the pipe line. 1 ... Joint body, 2 ... Moving joint, 3 ... Packing,
4 …… Connection pipe, 7 …… Packing, 11 …… Male thread, 11
a, 11b …… Female thread, 12 …… Screwed section, 16 …… Inner tube section, 18…
… Pipe socket, 21 …… Female thread, 22 …… Screwed part, 28 …… Pipe socket.

Claims (1)

[Claims] 1. A joint body having cylindrical threaded portions on opposite outer surfaces of which male threads of opposite directions are formed, and an inner peripheral surface of a female thread which can be screwed onto the male thread of each threaded portion of the joint body. And a pair of moving joints each having a cylindrical threaded portion formed on the inner joint portion, the inner joint portion slidably contacting the inner surface of the joint portion of the joint body. The tip portion is projected from the tip of the tubular screwing portion, and the packing is mounted in the concave groove provided on the outer peripheral surface of the tip portion of the inner tubular portion projecting from the tip of the tubular screwing portion. As a result, packing is interposed between the outer peripheral surface of the distal end portion of the inner tubular portion and the inner peripheral surface of the threaded portion of the joint body, and the pipe receiving port where the end face of the connecting pipe can be joined to the outer end portion of each moving joint is provided. A pipe joint characterized by being formed.