JPH10231967A - Pipe fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and speedily carry out connection work even in a narrow working site by furnishing a pipe fitting main body and a cylindrical retainer and burying a plural number of small discs for pipe falling stop to that a part is projected to the outer peripheral side along a ridge of a male screw part of this retainer and another part is projected from an inner peripheral surface. SOLUTION: In the case of connecting a pipe fitting and a connecting pipe 5 to each other, an end part of the connecting pipe 5 inserted into a hole part of a retainer 2 is inserted into a connecting pipe insertion part 11 of a pipe fitting main body 1, and an end surface 26 of the connecting pipe 5 is made contact with a stepped part 10. Thereafter, a male screw part 7 of the retainer 2 is screwed in a tapered female screw part 6 of the pipe fitting main body 1, and it is screwed in until an end surface of an outer collar part 15 makes contact with the pipe fitting main body 1. At this time, as outside top parts 16 of a plural number of small discs 4 slide and make contact with the tapered female screw part 6, escape of the small discs to the outer peripheral side is prevented, and accordingly, an inside top part 25 projected from an inner peripheral surface 8 of the retainer 2 certainly bites in an outer peripheral surface of the connecting pipe 5, and falling stop of the connecting pipe 5 is firmly carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a pipe joint.

[0002]

2. Description of the Related Art Heretofore, it has been widely used to cut a tapered male thread portion at an end of a pipe to be connected and screw a female thread portion of a pipe joint therewith.

[0003]

However, in this pipe joint, if the work site is small and the joint body is large or L-shaped, the joint body is rotated to connect to the pipe to be connected. In some cases, the screw could not be screwed in, causing problems. In addition, when the thickness of the pipe to be connected is thin (in the case of a copper pipe or the like), it is difficult or impossible to machine the external thread, so that the pipe joint has a complicated mechanical connection structure. was there.

Accordingly, an object of the present invention is to provide a pipe joint which has a simple structure and can easily and quickly perform a connecting operation even in a small site.

[0005]

In order to achieve the above object, a pipe joint according to the present invention comprises a joint body having a tapered female thread at an open end, and a male thread threadedly engaged with the tapered female thread. A cylindrical retainer having a plurality of small pipe retaining discs buried so as to have a portion and partially protrude to the outer peripheral side along the ridge of the external thread portion and partially protrude from the inner peripheral surface. , Is provided.

A joint having a tapered female thread portion, a parallel portion for sealing, a first stepped portion, a connected pipe insertion portion, a second stepped portion, and a flow passage hole sequentially from the opening end to the inside of the shaft center. Body and
A sealing member disposed at the corners of the parallel portion for sealing and the first stepped portion, and a male screw portion screwed into the tapered female screw portion of the joint main body; And a cylindrical retainer having a plurality of small pipe retaining discs embedded so as to partially protrude toward the outer peripheral side and partially protrude from the inner peripheral surface.

[0007] In the longitudinal section including the axis of the joint body, the outer top of the small disk is set to have substantially the same cross-sectional shape as the crest of the male screw portion. In addition, small disk
It has a sharp circular outer peripheral edge that cuts into the outer peripheral surface of the connected pipe.

Further, the small disk is rotatably embedded in the retainer. The small disk is a soloban ball type. The small disk is a convex lens type.

The retainer is made of plastic, and a small metal disc is press-fitted by elastic deformation of the plastic. Also, a small metal disk,
It is embedded in the retainer by plastic insert molding.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing embodiments.

FIG. 1 shows an embodiment of a pipe joint according to the present invention. The pipe joint includes a joint body 1 having a tapered female screw portion 6 at an open end and a tapered female screw portion 6 of the joint body 1. Cylindrical retainer 2 having tapered male thread portion 7 to be screwed
And a sealing material 3, and the retainer 2 is embedded so as to partially protrude toward the outer peripheral side along the ridge of the male screw portion 7 and partially protrude from the inner peripheral surface 8. It has a plurality of small discs 4 for retaining pipes.

More specifically, a cylindrical joint body 1 will be described.
The tapered female screw portion 6, the parallel portion for sealing 9, the first stepped portion 10, the connected pipe insertion portion 11, the second stepped portion 12, and the flow passage hole 13 in the axial direction from the opening end thereof. , Sequentially.
The first stepped portion 10 is provided in an annular shape, and a ring-shaped sealing material 3 is disposed at a corner of the parallel portion 9 with the first stepped portion 10.

The retainer 2 is made of plastic and has the external thread 7 on the outer peripheral surface of the cylindrical portion 14.
The cylindrical portion 14 has a polygonal outer flange portion 15 at the base end.

The small disk 4 is made of metal (for example, hardened steel or stainless steel), has a rhombic shape as viewed from the front as shown in FIG. 2A, and has a circular shape as viewed from the side as shown in FIG. The outer shape is a solovan ball shape having a sharp circular outer peripheral edge 18 and having raised tops 20 and 20 formed in a conical shape on both sides of the circular outer peripheral edge 18.

As shown in FIGS. 1 and 2, in the longitudinal section including the axis of the joint body 1, the outer top 16 of the small disc 4 is formed.
Are set to have substantially the same cross-sectional shape as the crest portion 17 of the male screw portion 7. That is, the angle θ of the outer apex 16 of the small disk 4 is set substantially equal to the screw angle of the male screw 7 (the angle of the crest 17 apex 17a), and the outer apex 16 is a part of the crest 17 apex 17a. Has formed. Thereby, the retainer 2 and the joint body 1
To maintain the screw connection strength.

As shown in FIGS. 1 and 3, the retainer 2 made of plastic has a plurality of holes 19 for embedding the small disk 4 at the time of plastic molding. The small disks 4 made of metal are press-fitted into the portions 19 to be embedded.

More specifically, the hole 19 of the retainer 2 has an outer top portion 16 of the small disk 4 on its outer peripheral side and inner peripheral side.
And inside and outside openings 28 and 29 for making the inside top 25 project. The inside of the hole 19 is wider than the outside and inside openings 28 and 29 and has a small disk 4. (See above) and the vicinity thereof. Also, the outer opening 28 is wider than the inner opening 29,
The opening edge 21 is rounded.

FIG. 3A shows a state before the small disk 4 is pressed into the hole 19 of the retainer 2, and the small disk 4 is inserted into the outer opening.
When pressed from the hole 28 toward the hole 19, the outer opening 28 expands due to the elastic deformation of the plastic, and the raised top 20 of the small disk 4 slides over the opening edge 21 and, as shown in FIG. The small disk 4 fits inside the hole 19, and the small disk 4 is rotatable about an axis P passing through the raised tops 20, 20.
Buried in

In order to connect the pipe joint of the present invention to the pipe 5 to be connected, as shown in FIG. 1, the end of the pipe 5 to be inserted into the hole of the retainer 2 is connected to the joint body 1. The end face of the connected pipe 5
26 is brought into contact with the first stepped portion 10 for positioning. At this time, the flow passage in the connected pipe 5 and the flow passage hole 13
Communicates with In order to seal the space between the retainer 2 and the joint body 1 and the space between the retainer 2 and the pipe 5, the inner peripheral surface 8 of the hole of the retainer 2 and the outer peripheral surface of the male screw portion 7 are previously coated with a viscous material. A certain liquid sealing material or the like is applied in advance. Thus, it is possible to prevent water from entering from outside and also prevent electrolytic corrosion of the pipe connection site.

Then, the male thread 7 of the retainer 2 is screwed into the tapered female thread 6 of the joint body 1, and as shown in FIG. 4, the gap between the male thread 7 of the joint body 1 and the pipe 5 to be connected is connected. The retainer 2 is screwed forward, and the end face of the outer flange 15 is
Screw until it touches.

At this time, the outer top 16 of the small disk 4 slides into contact with the tapered female screw portion 6 to prevent the small disk 4 from escaping to the outer peripheral side, thereby protruding from the inner peripheral surface 8 of the retainer 2. The inner top 25 is the outer peripheral surface 22 of the pipe 5 to be connected.
Can be surely dig into. More specifically, of the plurality of small disks 4 embedded in the retainer 2, the outer peripheral edge of the first small disk 4 (mostly disposed on the joint body 1 side)
The inner top 25 of 18 gradually penetrates deeply into the outer peripheral surface 22 of the connected pipe 5 by the advance of the retainer 2, and forms a spiral bite mark 23. At this time, if there is a small convex portion on the outer peripheral surface 22, the small disk 4 rotates and rides over the small convex portion, so that the retainer 2 can be smoothly screwed to the end.

In the second and subsequent small disks 4, the inner top 25 of the outer peripheral edge 18 advances along the biting trace 23 formed earlier (or further proceeds while biting). To lock. That is, it is in a state of being cut into the connected pipe 5. Thus, the plurality of small disks 4 are connected to the connected pipe 5.
Biting into the outer peripheral surface 22 of the connection pipe 5, the connection pipe 5 is securely prevented from coming off.

When the retainer 2 advances, the tip 24 presses the sealing material 3 toward the first stepped portion 10 of the joint body 1, whereby the joint body 1 and the pipes 5 and 5 to be connected are connected. The gap between the retainers 2 is sealed, so that external leakage of the fluid in a later use state is prevented. By screwing the outer flange portion 15 of the retainer 2 until the outer flange portion 15 comes into contact with the joint body 1, the sealing material 3 is appropriately compressed, and the small disk 4 of the male screw portion 7 which advances the tapered female screw portion 6. Is set so as to bite deeply into the pipe 5, the operator can visually confirm the correct screwing, and the connection work can be performed quickly.

The small disks 4 are provided in a number of about four to ten at a predetermined interval from the male thread part 7 on the tip end 24 side of the retainer 2, and the connected pipe 5 is located from the axis. They are arranged at opposing positions so as not to shake.

Next, FIG. 5 shows another embodiment of the pipe joint of the present invention. In this embodiment, a small disk 4 of a hexagonal shape having a hexagonal shape in a front view is embedded in a retainer 2. That is, the small disk 4 has circular flat portions 27, 27 protruding on both sides with the outer peripheral edge 18 as a boundary. The angle of the outer top 16 is substantially equal to that of the male thread 7 of the retainer 2 (as described above).

The hole 19 of the retainer 2 for burying the small disk 4 is formed in a shape surrounding the circular flat portions 27, 27 of the small disk 4 and the vicinity thereof. The hole 19 is press-fitted from the outside opening. The small disk 4 is embedded in the hole 19 so as to be rotatable around an axis P passing through the centers of the circular flat portions 27, 27.

FIG. 6 shows another embodiment, in which a small disk 4 embedded in a retainer 2 is formed into a circular convex lens type, and a shaft 19 is formed in a hole 19 of the retainer 2. It is provided rotatably around the center P.

The present invention is not limited to the above-described embodiment. For example, it is preferable that the small metal disk 4 is embedded in the retainer 2 by plastic insert molding.
Further, the small disk 4 may be formed of ceramic.

[0029]

Since the present invention is configured as described above, the following effects can be obtained.

By screwing the male thread 7 of the retainer 2 into the tapered female thread 6 of the joint body 1, a plurality of small disks 4 projecting from the inner peripheral surface 8 of the retainer 2. Dig into the outer peripheral surface 22 of the connected pipe 5 to be connected to the joint body 1. Thereby, the connected pipe 5 is firmly prevented from being pulled out of the joint body 1.

By screwing the male thread 7 of the retainer 2 into the tapered female thread 6 of the joint body 1, a plurality of small disks 4 projecting from the inner peripheral surface 8 of the retainer 2. However, the connected pipe 5 is cut into the outer peripheral surface 22 of the connected pipe 5 to be connected to the joint body 1, and the connected pipe 5 is firmly prevented from being removed from the joint body 1. Further, the tip of the retainer 2 presses the seal member 3 toward the first stepped portion 10, and the gap between the joint body 1, the connected pipe 5 and the retainer 2 is sealed, and the fluid leaks externally in a state of use thereafter. Is prevented. In other words, since the retaining work and the prevention of external leakage of the fluid can both be performed by the screwing work of the retainer 2, the connecting work can be performed quickly and easily even in a small site.

(According to claim 3) the outer top 16 of the small disk
However, by forming a part of the ridge portion 17 of the male screw portion 7 of the retainer 2, the screw connection strength between the retainer 2 and the joint body 1 can be maintained. Further, since the small disk 4 does not escape to the outer peripheral side from the tapered female screw portion 6 of the joint main body 1, the outer peripheral surface of the connected pipe 5 is formed at a part (the inner top 25) of the small disk 4 protruding inward. 22 can be made to bite reliably.

According to the fourth aspect, even the connected pipe 5 (metal pipe) having a hard outer peripheral surface 22 can be bitten by the small disk 4, and the connected pipe 5 can be securely prevented from coming off. can do.

When the retainer 2 is screwed into the joint body 1, even if there is a small protrusion on the outer peripheral surface 22 of the pipe 5 to be connected, the small disk 4 rotates to make the small protrusion. Since it can get over the part, the retainer 2 can be smoothly screwed to the end. Further, by rotating the small disk 4, the retainer 2 can be screwed with a small force and can be deeply cut into the pipe 5.

According to claim 6 or 7, a circular outer peripheral edge is provided.
The shape of the small disk 4 is increased due to the shape in which the thickness of the central portion is increased by being raised on both sides from the boundary 18.

(According to claim 8) The manufacture of the retainer 2 is easy, and the small disk 4 can be easily embedded in the retainer 2.

According to the ninth aspect, the pull-out strength of the small disk 4 embedded in the retainer 2 increases.

[Brief description of the drawings]

FIG. 1 is a half sectional view of an essential part showing an embodiment of a pipe joint of the present invention.

FIG. 2 is an explanatory diagram of a small disk.

FIG. 3 is an operation explanatory view showing a state where a small disk is pressed into a hole of a retainer.

FIG. 4 is a sectional front view of a main part showing a connection state.

FIG. 5 is a cross-sectional front view of a main part showing another embodiment.

FIG. 6 is a cross-sectional front view of a main part showing another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Joint main body 2 Retainer 3 Seal material 4 Small disk 5 Connected pipe 6 Tapered female thread part 7 Male thread part 8 Inner peripheral surface 9 Parallel part 10 First stepped part 11 Connected pipe insertion part 12 Second stepped part 13 Channel hole 16 Outside top 17 Peak 18 Outer edge 22 Outer surface

Claims (9)

[Claims] 1. A joint body 1 having a tapered female screw portion 6 at an open end, a male screw portion 7 screwed to the tapered female screw portion 6, and a part along the ridge of the male screw portion 7. And a cylindrical retainer (2) having a plurality of small pipe retaining discs (4) buried so as to protrude to the outer peripheral side and partially protrude from the inner peripheral surface (8). 2. A tapered female screw portion 6, a parallel portion 9 for sealing, a first stepped portion 10, a connected pipe insertion portion 11, a second stepped portion 12, a flow passage hole extending in the axial center direction from the open end. 13 is screwed into the tapered female thread 6 of the joint body 1, the sealing member 3 disposed at the corners of the parallel portion 9 for sealing and the first stepped portion 10, and the joint body 1 having the joints 13 sequentially. And a plurality of small discs for retaining pipes embedded so as to partially protrude toward the outer peripheral side and partially protrude from the inner peripheral surface 8 along the ridges of the external thread portion 7. 4. A pipe joint comprising: a cylindrical retainer 2 having 4... 3. In a longitudinal section including an axis of the joint main body 1,
3. The pipe joint according to claim 1, wherein an outer top portion of the small disk is set to have substantially the same cross-sectional shape as a crest portion of the male screw portion. 4. 4. The small disk 4 is connected to the outer peripheral surface 22 of the pipe 5 to be connected.
2. A sharp circular outer peripheral edge 18 which cuts into a groove.
Or the pipe joint according to 3. 5. The pipe joint according to claim 1, wherein the small disk is rotatably embedded in the retainer. 6. The pipe joint according to claim 1, wherein the small disk 4 is a soloban ball type. 7. The small disk 4 is of a convex lens type.
The pipe joint according to 2, 3, 4 or 5. 8. The retainer 2 is made of plastic,
The pipe joint according to claim 1, 2, 3, 4, 5, 6, or 7, wherein the small disk 4 made of metal is press-fitted by elastic deformation of the plastic. 9. A small metal disk 4 embedded in a retainer by plastic insert molding.
The pipe joint according to 3, 4, 5, 6, or 7.