JPH05231584A - Pipe joint with flange - Google Patents

Abstract

PURPOSE:To connect a short pipe with a one-side flange to a joint main body separately manufactured to each other by using a connection structure of a pipe joint provided with a slip-off prevention fitting. CONSTITUTION:A flanged pipe joint 7 comprises a short tube 1 with a one-side flange and a joint main body 2. A slip-off prevention fitting 4 is loosely fitted to a recessed part 3 provided on the entire circumference of the inner circumferential surface of a socket of the joint main body 2. The recessed part 3 has a tapered surface that is gradually shortened in the diameter toward the opening side of the joint main body. The slip-off prevention fitting 4 is formed into a cylinder provided with a notched part 6 of a predetermined width, and a hook means 11 is provided for the outer peripheral surface of the short tube 1 with the flange, on the inner circumferential surface of the fitting.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flanged pipe joint used for piping such as a water pipe.

[0002]

2. Description of the Related Art FRP pipe joints used for water pipes are disclosed in JP-A-2-95833, JP-A-2-95834, and JP-A-2-95834.
As disclosed in Japanese Patent No. 95835, after molding using a hollow molding inner die, the molding inner die is twisted, air inside is not released, and the cross-sectional area is buckled. It is molded by making it smaller and demolding.

However, in the flanged pipe joint,
Since it is difficult to remove the manufacturing die from the shape because of its shape, a method is used in which a short tube with a flange on one side and a joint body are separately manufactured, and then the two are joined and integrated. In order to bond the both, as shown in FIG. 5, after surface treatment such as sanding of the both joints, FRP is laminated and connected.

[0004]

However, in the above-mentioned method of joining and integrating the separately manufactured short pipe with the one-sided flange and the joint body by the FRP laminating process, before the FRP laminating is performed. Due to variations in sanding work for surface treatment, there is a problem that adhesive strength may be insufficient and a predetermined standard may not be satisfied, and the process may be complicated.

In addition, distortion such as warpage of the flange surface may occur due to hardening shrinkage in the manufacturing process of the short tube with a flange on one side, and even if tightened through packing, water leakage may occur due to water pressure. It was Therefore, if the short tube with a flange on one side is accurately molded by injection molding etc. with vinyl chloride resin, etc., and if it can be easily and reliably connected to the joint body separately manufactured by FRP, the above various The present invention has been made paying attention to the point that the above problems can be solved all at once.

[0006]

The present invention has been made in view of the above problems and is provided with a retaining device as shown in FIG. 2, which is disclosed in Japanese Patent Laid-Open No. 2-240492. The connection structure of the pipe joint is used to connect the short pipe with the flange on one side to the separately manufactured joint body.

That is, specifically, in a pipe joint comprising a branch portion with a flange and a joint body portion, the branch portion is formed by inserting a short pipe with a flange on one side into a receiving port of the joint body portion, On the inner peripheral surface of the receiving port of the joint body,
A cylindrical shape in which a concave portion having a tapered surface whose diameter is gradually reduced toward the flange side of the branch portion is provided, and a cutout portion having a predetermined width is partially provided in the concave portion, and the inner peripheral surface is A means for loosely inserting a cylindrical retainer having a retaining means for retaining the outer peripheral surface of the flanged short tube is formed.

[0008]

According to the flanged pipe joint of the present invention having the above-mentioned structure, a cutout portion having a predetermined width is provided in a part of the retaining member which is loosely inserted in the recess provided in the inner peripheral surface of the receiving port, and the retaining member is prevented. Since the tool is formed so that it can be expanded / reduced in diameter, when the short tube with the flange is inserted into the retaining tool, the short tube with the flange is inserted while expanding the diameter of the retaining tool.

After the insertion is completed, the locking means provided on the inner surface of the retaining member acts on the outer peripheral surface of the flanged short pipe by a predetermined tightening force of the retaining device to lock the short pipe. To do. Therefore, when a force in the pulling direction acts to move the short tube in the pulling direction, the retaining means also moves the retaining device to the flange side. Further, since the recessed portion in which the retaining device is mounted has a taper surface whose diameter is reduced toward the flange side, the retaining device receives an action of further reducing the diameter. Therefore, the retainer more firmly hooks the flanged short pipe, and a detachment preventing force against the force in the detachment direction is generated between the two to prevent the detachment.

Thus, according to the configuration of the present invention,
Thus, a flanged pipe joint in which the short pipe with the flange on one side and the joint body are integrated is formed.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The flanged pipe joint of the present invention will be described in detail below with reference to the drawings showing the embodiments thereof. FIG. 1 is a partial cross-sectional side view showing an FRP flanged pipe joint used for a water pipe as an embodiment of the present invention, showing the way of connecting a short pipe with a flange on one side and a joint body separately manufactured. ..

In FIG. 1, 1 is a short tube with a flange on one side, 2 is a joint body, 3 is a concave portion provided over the entire circumference of the inner peripheral surface of the receiving opening of the joint body 2, and 4 is loosely inserted in the concave portion 3. It is a stopper that has been removed. The flanged pipe joint 7 of the present embodiment is configured with the above as a main part.

As shown in FIG. 2, the recess 3 has a tapered surface whose diameter gradually decreases toward the opening side of the joint body.

The retainer 4 is similar to that disclosed in Japanese Patent Laid-Open No. 2-240492, and it is provided on the inner peripheral surface of the joint body 2 as it goes to the opening side. It is inserted into a recessed portion 3 having a tapered surface of which the diameter is gradually reduced, and is cylindrical with a notch 6 having a predetermined width provided in a part thereof, and an outer peripheral surface of a flanged short tube is formed on an inner peripheral surface. It has a hooking means 11 for.

A case will be described in which the short pipe 1 with a flange on one side and the joint body 2 having the above-described structure are connected to each other to form a joint used at a branch point of a T-shaped tube at a location where a fire hydrant is installed. In this case, the short pipe 1 with a flange on one side for connecting a branch pipe with a nominal diameter of 100 mm is molded by injection molding, and the joint body 2 with a nominal diameter of 150 mm is described in JP-A-2-95833 and JP-A-2-95833. It is manufactured by the conventional method using the inner mold disclosed in each publication such as 2-95834 and JP-A-2-95835. On the inner surface of the joint body 2, the water blocking rubber annular body 5 and the retaining device 4 having the above-described configuration are mounted.

When the short tube 1 with a flange on one side is inserted into the receiving port of the joint body 2 thus constructed, the tip of the short tube 1 passes through the rubber-made annular body 5 for water stoppage and the stopper 4 for preventing recording of war. While expanding the diameter, it is inserted and connected to the specified depth. At this time, the hooking means hooks the short tube 1 by the initial tightening force of the retainer 4, so that the two are connected. Then, when the short pipe 1 moves in the pull-out direction by the force in the pull-out direction, the retaining means 11 moves the retainer 4 to the opening side. Since the recessed portion 3 in which the retainer 4 is mounted has a tapered surface whose diameter is reduced toward the opening side, the retainer 4 is subjected to the action of further reducing the diameter. Therefore, the hooking means 11
By virtue of the above action, the retainer 4 and the short tube 1 with the flange are more firmly meshed with each other, and a separation preventing force against the force in the removal direction is generated between them to prevent the short tube 1 from coming off.

Thus, according to the configuration of the present invention,
The flanged pipe joint 7 in which the short pipe 1 with a flange on one side and the joint body 2 are integrated is formed. When the water tightness test of the pipe joint with flange 7 was carried out, the short pipe 1 with the flange on one side did not come out from the joint body 2 even under the test water pressure of 40 kg of water supply standard (JWWA).

Incidentally, as shown in FIG. 1, not only the branch pipe side but also the main pipe side connecting portion side is equipped with a retainer, and a short pipe 10 with a flange on one side is inserted to branch. It is also easy to provide a pipe joint as a branch T-shaped pipe in which a flange is provided on both the pipe side and the main pipe side. In addition, in accordance with the standard of ordinary water supplies, in order to secure a movement amount of 9 mm of the short pipe 1 with a flange on one side which is an insertion pipe, it is possible to widen the width of the recess 3 or the width of the recess 3. It is also possible to reduce the amount of movement by narrowing.

Further, a groove 8 may be provided on the surface of the insertion port of the short pipe 9 having a flange on one side so that the retaining device can be easily hooked. At this time, the cross-sectional shape of the retainer is
As shown in FIG. 4, even if it is not a hooking means having protrusions as in FIG. 1, it can be securely hooked in a circular shape, a triangular shape, or a quadrangular shape as shown in FIG. That is, the hooking means may be formed by the interaction between the groove 8 and the retaining member having the cross-sectional shape shown in FIG.

[0020]

As described above, in the pipe joint with a flange of the present invention, pretreatment such as sanding is not required, so that the quality of the product can be stabilized. Also, since the flange part is manufactured separately from the joint body made by stacking FRP, when the flange surface is manufactured with high accuracy and the flanges are connected via packing, water leakage may occur due to water pressure. Can be prevented.

Further, not only T-shaped pipes, but also various types of joints such as curved pipes, one-sided pipes, etc. are equipped with retaining devices so that those joints can be easily fitted with flanges. The effect that can be obtained is also obtained.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional side view of a pipe joint with a flange according to an embodiment of the present invention during connection and insertion.

FIG. 2 is a partially enlarged side sectional view of the pipe joint with a flange.

FIG. 3 is a partial cross-sectional side view of another embodiment of the flanged pipe joint.

FIG. 4 is an explanatory diagram showing an example of a cross-sectional shape of the retaining device.

FIG. 5 is an explanatory view for explaining a connecting process of a conventional flanged pipe joint.

[Explanation of symbols]

 1,9,10 Short pipe with flange on one side 2 Joint body 3 Recess 4 Stopper 6 Notch 7 Flange pipe joint 8 Groove (Latching means) 11 Latching means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tatsuo Ogose 56, 900, Numata, Sanyo-cho, Akaban-gun, Okayama Prefecture

Claims (1)

[Claims] 1. A pipe joint comprising a branch portion with a flange and a joint main body portion, wherein the branch portion is formed by inserting a short pipe with a flange on one side into a receiving opening of the joint main body portion. The inner peripheral surface of the is provided with a concave portion having a tapered surface whose diameter is gradually reduced toward the flange side of the branch portion, and the concave portion is partially provided with a notch portion of a predetermined width. The flanged pipe joint is characterized in that a cylindrical retainer having an engaging means for engaging the outer peripheral surface of the flanged short pipe is loosely inserted in the inner peripheral surface.