JP2011033145A - Pipe joint cap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To remove a pipe joint from a pipe while a joint cover is mounted thereon. <P>SOLUTION: This pipe joint cap 1 to be mounted on the joint having a tube composed of an inner tube and an outer tube and a release push includes a small diameter part 2 being externally inserted into the tube, a large diameter part 3 mounted on the joint, and a connection part 4 for connecting the small diameter part and the large diameter part mutually. A claw part 5 for fixing the release push in the axial direction is formed at the inner periphery of the pipe joint cap. The joint has the release push and a chuck for energizing the release push onto an outer side in the axial direction at the inner periphery of a joint body. While the release push is pressed into an inner side in the axial direction, the chuck is opened to allow the inner tube to move in the axial direction, and while the release push is pushed out onto an outer side in the axial direction, the chuck is closed to prevent the inner tube from moving in the axial direction. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention is a cap for protecting the inner core of a tube from, for example, spatter from arc welding, for example, covering a joint portion of a tube through which a fluid such as water or air flows. The present invention relates to a pipe joint cap that can be easily operated.

  Conventionally, the tube for fluid used in the environment where the spatter of an arc welding apparatus flies and its joint are protected against the spatter. For example, Patent Document 1 discloses a joint of a double pipe (see FIG. 11) consisting of a tube (inner pipe) 10 and a protective tube cover (outer pipe) 13 fitted around the inner pipe 10. An applied joint cover 1 (see FIGS. 8 to 10) is disclosed.

The joint cover 1 includes an annular mounting portion 2 for insertion into the outer tube 13 and a large-diameter covering portion 3 for covering the joint 20 (see FIG. 13). The parts 3 are connected by a connecting part 4 comprising an annular step part. As shown in FIGS. 9 and 10, four elastic protrusions 31 having a predetermined protrusion height with sharp tips at the center axis symmetrical position of the joint cover 1 are mounted on the inner peripheral surface 30 of the mounting portion 2. The portion 2 is formed so as to protrude in the length direction.
As shown in FIG. 11, in the outer tube 13 that is extrapolated with the connecting portion 10A of the inner tube 10 extended, the covering portion 3 of the joint cover 1 is connected to the connecting side (the connecting end portion 10A side) of the inner tube 10. The mounting part 2 is extrapolated. The mounting portion 2 is satisfactorily inserted on the outer periphery of the outer tube 13 because each elastic protrusion 31 on the inner peripheral surface 30 has elasticity and is provided extending in the tube axis direction. Thereafter, in a state where the joint cover 1 is extrapolated (see FIG. 12), the connecting end portion 10A is connected to the joint 20 of the base tube 35 as shown in FIG.

  Since the joint 20 has a structure that allows axial movement of the tube (inner tube) 10 to be inserted by opening the internal annular spring by pressing the operation ring 22 shown in FIG. 15 in the axial direction. Can be inserted in a retaining shape by pressing in the axial direction and inserting the connecting end portion 10A of the inner tube 10 into the mouth portion 36 thereof.

  After connecting the inner pipe 10 to the joint 20 (see FIG. 13), the joint cover 1 is slid to the joint 20 side so that the covering portion 3 of the joint cover 1 covers the joint 20 (see FIG. 14). In this state, the passage in the base tube 35 is fixed in a state where the passage is communicated with the passage in the inner tube 10 via the mouth portion 36 of the operation ring 22, and the joint tube 1 is exposed to the outside. In order to prevent this, the tip of the inner tube and the joint 20 are covered.

  In the welding process, spatter comes in, but since the outer tube 13 and the joint cover 1 are made of polyvinyl chloride resin containing 30% of the ADC resin, the spatter attached to the cover is removed without adhering.

Japanese Utility Model Publication No. 6-43490

  In the conventional joint cover described above, when connecting the joint and the tube, the inner pipe 10 is connected to the joint 20 and then the joint cover 1 is slid to the joint 20 side so that the covering portion 3 covers the joint 20 ( In order to release the connection, first, the joint cover 1 is moved in the opposite direction to the above and retracted from the joint 20, and then the operation ring 22 is moved in the axial direction. The procedure of pressing and removing the inner tube 10 from the joint 20 is performed. Therefore, when it is necessary to frequently attach and detach the tube 10 and the base tube 35, and when it is necessary to attach and detach many pipe joints at the same time, the work takes time and effort. was there.

  An object of the present invention is to provide a joint cover that can easily attach and detach a pipe joint and a pipe without moving the joint cover, in order to solve the above problems.

  In order to solve the above-mentioned problem, a joint cap according to the present invention is a cap that is attached to a tube including an inner tube and an outer tube, a joint having a release push, and a small-diameter portion that is extrapolated to the tube. A large-diameter portion to be attached to a joint, and a connecting portion that connects the small-diameter portion and the large-diameter portion, and a claw portion that fixes the release push in the axial direction are formed on the inner periphery. .

  In addition to the above features, the joint cap according to the present invention includes, on the inner periphery thereof, the release push and a chuck that biases the release push outward in the axial direction, and the release push is pushed inward in the axial direction. In the state where the chuck is opened, the inner tube is allowed to move in the axial direction, and in the state where the release push is pushed outward in the axial direction, the chuck is closed to move the inner tube in the axial direction. It is a thing that prevents.

  In addition to the above features, the joint cap of the present invention is characterized in that the outer tube and the cap are made of a material having excellent environmental characteristics.

  In addition to the above features, the spatter-resistant pipe joint cap of the present invention is characterized in that the outer tube and the cap are made of a material having flame retardancy and heat resistance close to nonflammability in the atmosphere. To do.

  In addition to the above-described characteristics, the spatter-resistant pipe joint cap of the present invention is characterized in that the material having flame retardancy and heat resistance is a composite material excellent in environmental characteristics of non-halogen and non-phosphorus.

  In addition to the above features, the spatter-resistant pipe joint cap of the present invention is characterized in that the inner tube is a plastic tube.

  In addition to the above features, the spatter-resistant pipe joint cap of the present invention comprises an inner layer made of a soft nylon elastomer mainly made of nylon 12 and an outer layer made of soft urethane outside the inner layer. It is characterized by.

Furthermore, the pipe joint of the present invention is characterized in that the pipe joint cap is mounted.
Furthermore, the pipe joint of the present invention is a Y-type pipe joint that is mounted by cutting a part of the pipe joint cap.

  Furthermore, the pipe joint of the present invention is a multiple pipe joint mounted by cutting a part of the pipe joint cap.

  According to the present invention, in a pipe joint that protects a connection portion between a pipe joint and a tube by mounting the joint cover, the pipe joint and the tube can be attached and detached without attaching and detaching the joint cover to the joint body. It can be done easily and in a short time. Moreover, it is economical because the same joint cover can be used for Y-type pipe joints and multiple pipe joints without preparing dedicated parts.

(A) is a front view of the cap 1 according to the first embodiment of the present invention, (b) is a side sectional view, (c) is an enlarged view in a circled portion in the front view of (a), and (d) is (b) ) Is an enlarged view in a circled portion in the side view. (A) is a side view of the pipe joint 20 to which the cap 1 shown in FIG. 1 is mounted, and (b) is a front view (from the cap side). 3 is a cross-sectional view orthogonal to the axis of the tube used in Example 1. FIG. It is a partial cross section figure along the axis which shows the state where the pipe joint 20 with which the cap 1 of Example 1 was mounted | worn, and the tube were connected. FIG. 5 is an enlarged view within a circled portion in the partial cross-sectional view of FIG. 4. Example 2 of the present invention will be described. (A) shows the front view of the cap 1 used for Example 2, (b) shows a side view similarly. It is a perspective view of the joint cover of a prior art example. FIG. 10 is a cross-sectional view of the conventional joint cover mounting portion 2 shown in FIG. 9 taken along line XX. It is a sectional side view of the joint cover of a prior art example. It is a perspective view of the double pipe of a prior art example. FIG. 7 is a perspective view showing a state in which a mounting portion 2 of a joint cover 1 is extrapolated to a conventional double pipe. FIG. 13 is a perspective view showing a state where the connection end portion 10A of the inner tube 10 in the state shown in FIG. 12 is inserted into the mouth portion 36 of the joint 21. It is a perspective view which shows the state which the joint cover of the prior art example covered the connection location of the joint and the tube. FIG. 10 is a side view showing a joint 21 and an operation ring 22 provided on a base pipe 35 of a conventional example.

  The embodiment of the present invention uses a flexible material that has excellent water resistance for the inner tube to flow a fluid such as water and does not worry about thinning or hardening of the tube, and its outer jacket is flame retardant. Applying to the joint part of a composite pipe using a highly heat-resistant protective cover with flame resistance that is nearly non-flammable in a protective atmosphere, for example, spatter resistant to protect the inner pipe and joint from spatter from arc welding, for example. It is a cap. Examples of the anti-spatter cap according to the present invention will be described below.

[Example 1]
Fig.1 (a) is a front view (from the coupling side) of the cap 1 used for Example 1, FIG.1 (b) is a sectional side view similarly. FIG.1 (c) is an enlarged view in the (circle) part of Fig.1 (a), and FIG.1 (d) is an enlarged view in the (circle) part of FIG.1 (b). Moreover, Fig.2 (a) is a side view of the pipe joint with which the cap 1 is mounted | worn, and FIG.2 (b) is the front view (from the cap side).

  The cap 1 has a mounting portion 2 for mounting a protective cover of the tube, a covering portion 3 having a larger diameter than this, and a step portion 4 between these portions. The cap 1 is first mounted so as to cover the main body 21 and the push ring 22 of the pipe joint 20 shown in FIG. As shown in FIGS. 1C and 1D, a claw 5 is formed at a position inside the cap 1 into which the push ring 22 is inserted. Therefore, once the push ring 22 is inserted inside the cap 1, the claw 5 acts to prevent the push ring 22 from retreating, so the cap 1 can be easily removed from the joint 20 unless a large external force is applied. Is fixed so that it will not fall off.

  As shown in FIG. 3, the tube used in Example 1 uses soft nylon elastomer whose main material is nylon 12 (PA12) for the innermost layer 11 and soft urethane for the layer 12 surrounding the outer side, Forms an inner tube 10 that is flexible, has excellent bending fatigue resistance and water resistance, and is free of concerns about thinning and hardening of the tube. Uses a composite material that has excellent environmental characteristics, has flame retardancy that is nearly nonflammable in the atmosphere, and uses a highly heat-resistant protective cover. However, the tube to be used is not limited to the above.

  4 is a partial cross-sectional view along the axis in a state where the tube is mounted on the mounting portion 2 of the cap 1 fixed to the pipe joint 20, and FIG. 5 is a circle in the partial cross-sectional view of FIG. The part is shown enlarged.

  Prior to mounting the cap 1 to the mounting part 2, the tube used is cut into the outer jacket 13 near the end using a sheath stripper (not shown), and the outer jacket on the connection end side is removed. Then, the inner tube 10 is processed to be exposed. The exposed length of the inner pipe is the length from the position of the step 23 that receives the inner pipe 10 in the joint body 20 to the position of the step 6 that receives the outer cover 13 in the fixed cap 1 (shown in FIG. 4). The length l) may be slightly longer or shorter than this.

  The tube processed as described above is inserted from the opening of the mounting portion 2 of the cap 1 fixed to the joint 20. At that time, when the tip (connection end) of the inner tube 10 pushes up the chuck 24 and further slides in the packing 25 made of rubber and enters the step 23 in the cap 1 (or the vicinity thereof), the chuck The inner tube 10 is fixed in the joint body 21 by the check action of 24, and at this time, the tube jacket 13 is in a state of entering the step 6 in the mounting portion 2 of the cap 1 (or the vicinity thereof). It has become. In this way, as shown in FIG. 4, the tube is fixed to the joint body 21 to which the cap 1 is attached. In this state, the fluid such as water flowing in the tube does not leak to the outside due to the sealing action of the packing 25.

  Next, a procedure for releasing the tube from the joint 20 will be described. In the state shown in FIG. 4, when the cap 1 is pushed in the axial direction toward the joint 20, the push ring 22 is pushed in the same axial direction, and the tip 22 A pushes the chuck 24 in the axial direction to By releasing from the surface, the check action of the chuck 24 is released. Thereby, the tube can be easily detached from the joint main body 21 and the cap 1.

  As described above, the connection and release of the pipe joint 20 and the tubes 10 and 13 can be performed while the cap 1 is attached to the joint main body 21, so that the attaching / detaching operation can be performed easily and in a short time.

[Example 2]
FIG. 6 relates to Example 2, and shows a state in which the cap of the present invention is attached to a Y-shaped joint. FIGS. 7A and 7B show a cap 1 ′ used in the second embodiment.

  The cap 1 'used in the second embodiment can be basically the same as the cap 1 used in the first embodiment, but the cap is used on the side where the two tubes are parallel (left side in FIG. 6). As shown in FIGS. 7A and 7B, 1 ′ is used by cutting a part of the covering portion 3 to expose the cross section 7 so as to avoid mutual interference.

  In the second embodiment, since the cap used in the first embodiment can be used, there is no need to manufacture a dedicated part for a Y-type pipe joint, which is economical.

  As described above, in Example 2, the Y-type pipe joint is an object, and FIGS. 7 (a) and 7 (b) show an example in which one side of the cap 1 is cut. The present invention can also be applied to pipe joints that connect multiple pipes that connect a large number of pipes.

  The present invention not only protects fluids such as water and air, but also transports powders, accommodates various cables and optical fibers, etc., and also protects against spatter from arc welding. In addition, it can be widely used for pipe joints when protection from high heat due to fire or the like is required.

1 Cap (Fitting cover)
1 'cap
2 Mounting part
3 Covering part
4 steps
5 nails
6 steps
10 Inner pipe
10A inner pipe connection end
11 Inner layer of inner pipe
12 Outer layer of inner pipe
13 Outer pipe (jacket)
20 Fitting
21 Fitting body
22 Push ring
22A Push ring tip (connection end)
23 steps
24 chuck
25 packing

Claims (10)

A cap that is attached to a joint comprising a tube having an inner tube and an outer tube and a release push,
A small diameter portion extrapolated to the tube;
A large-diameter portion attached to the joint;
A connecting portion for connecting the small diameter portion and the large diameter portion;
A pipe joint cap characterized in that a claw portion for fixing the release push in the axial direction is formed on the inner periphery. The cap of claim 1,
The joint includes an inner periphery of the release push and a chuck that biases the release push outward in the axial direction.
When the release push is pushed inward in the axial direction, the chuck opens and allows the inner tube to move in the axial direction. When the release push is pushed out in the axial direction, the chuck closes. A pipe joint cap for preventing axial movement of the inner pipe. The cap according to claim 2,
The outer pipe and the cap are made of a material having excellent environmental characteristics. The cap according to claim 2,
The sputter-resistant pipe joint cap, wherein the outer pipe and the cap are made of a material having flame resistance and heat resistance close to nonflammability in the atmosphere. The spatter resistant cap according to claim 4,
The sputter-resistant fitting cap according to claim 1, wherein the material having flame retardancy and heat resistance is a composite material excellent in non-halogen and non-phosphorus environmental characteristics. The spatter-resistant cap according to claim 4 or 5,
The sputter-resistant pipe joint cap, wherein the inner pipe is a plastic tube. The spatter-resistant cap according to claim 4 or 5,
The sputter-resistant pipe joint cap, wherein the inner pipe includes an inner layer made of a soft nylon elastomer made mainly of nylon 12 and an outer layer made of soft urethane outside the inner layer.   A pipe joint, wherein the pipe joint cap according to claim 1 is attached.   A Y-type pipe joint, wherein a part of the pipe joint cap according to claim 1 is cut and attached.   A multi-joint pipe joint, wherein a part of the pipe joint cap according to claim 1 is cut and attached.

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