JPH11270766A - Pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe joint that reliably prevents an inadvertent release of a hose-fitted spigot part and a reinforced flexible hose from each other while ensuring sufficient sealing performance. SOLUTION: This pipe joint, which is used for a reinforced flexible hose F comprising a flexible pipe (a) formed on its periphery with a line of reinforcement projection (b) at constant pitches, comprises a cylinder 11 that is shaped at its point periphery into a bamboo shoot as a pipe-fitted spigot part 12, is provided at its base end with a flange 13 and at its barrel with a locking body 15 serving to check the movement of an external clamping body 2, and is formed in its periphery with two sealing grooves 17 in which O rings 16 are placed. The external clamping body 2 is made of halved bodies 2a and 2b each formed in their lugs with a bolt hole so as to be fastened together with two pairs of bolts 24 and nuts 25. Each halved bodies 2a and 2b is formed in its interior surface with a spiral groove or internal thread 22 adapted to mesh with the spiral line of reinforcement projection (b), and on its interior surface with an inward edge 23 with an inside diameter made smaller than the outside diameter of the locking body 15 on the joint body 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint for use in a fluid transfer pipe (hereinafter referred to as a "reinforced flexible hose") in which reinforcing ridges are formed integrally at the same pitch on the outer peripheral surface of a flexible pipe.

[0002]

2. Description of the Related Art As is well known, reinforced flexible hoses have conventionally been used frequently for transferring various fluids, and are formed of a relatively hard rubber or resin material, or are used for reinforcement inside a pipe wall. On the outer peripheral surface of the pipe main body on which the fiber layer and the like are formed, a reinforcing ridge consisting of a spiral convex or a number of ring convexes having the same material as the pipe main and having high hardness is wound and integrated at a predetermined pitch. It has flexibility, high pressure resistance, abrasion resistance, etc., and is mainly used as a high pressure fluid transfer pipe, or it can be moved along the ground, trenches, underground tunnels etc. where there are many obstacles such as construction sites etc. It is adapted for use as a piping member for forming a passage.

A conventional pipe joint used for such a reinforced flexible hose is used as means for connecting reinforced flexible hoses to each other and connecting to a pump or the like, and has a connecting means such as a flange at a base end portion. The distal end of the tubular body is formed on the outer peripheral surface along the central axis direction of the tube with irregularities such as bamboo shoots and the like, and is fitted to the hose insertion part and the reinforcing flexible hose externally fitted to the hose insertion part. And a hose stopper for stopping mutual disengagement.The hose stopper is constituted by a pair of fastening halves that can be opened and closed or split open and closed with fastening means by bolts and nuts, An outer fitting groove formed on the inner peripheral surface of each tightening half to be fitted with the reinforcing ridge. When used for a reinforcing flexible hose having a spiral ridge, it fits into a recess between the spiral ridges. The wire rod is formed in the form of a torsion spring with an external fitting diameter secured, and both ends of the used wire rod are formed as screw rods, and the screw rods are extended to both ends of the curved board formed with the external fitting radius. A structure is used in which a loosening nut is screwed through a hole of the provided ear.

[0004]

SUMMARY OF THE INVENTION
Regardless of which hose stopper is provided, the sealing and detachment prevention functions can be achieved by simply tightening the flexible flexible hose fitted externally to the hose insertion part with irregularities such as bamboo shoots in the radial direction to make it tight. However, since the reinforced flexible hose itself is manufactured by extrusion molding means, the tolerance of the inner diameter due to the shrinkage and deformation of the material is large, and when the reinforced flexible hose is strongly tightened, the reinforced flexible hose tube is used. Not only will the wall be damaged such as cracks, shortening the service life, but also the time-dependent change such as creep phenomena impairs the resilience of the tube wall, lowering the sealing performance. Water hammer phenomena, cavitation phenomena caused by switching operation of operation of the pump device, etc. When the axial force acts between the hose insertion part and the reinforced flexible hose externally fitted by the fluid to be transferred, such as dynamic vibration or the degree of viscosity, the mixture of lumps and particles, only the sealability is reduced. In addition, the reinforced flexible hose is accidentally detached from the hose insertion part and the fluid flows out,
In order to lead to fatal accidents such as the collapse of construction sites and roads and the development of environmental pollution, there was a problem in that pipe joints that could reliably prevent such a situation had to be provided.

[0005] The present invention provides a pipe which can prevent inadvertent detachment between the hose insertion portion and the reinforcing flexible hose caused by the above-mentioned various factors while ensuring sufficient sealing performance with a simple structure. The task is to provide joints.

[0006]

A pipe joint according to the present invention comprises:
What is claimed is: 1. A pipe joint used for a reinforcing flexible hose having a structure in which reinforcing ridges are integrally formed at the same pitch on an outer peripheral surface of a flexible pipe, wherein: a joint main body to which one end of the reinforcing flexible hose is externally fitted; And a tightening external fitting body externally fitted to the outer peripheral portion.

[0007] The joint main body has a flange type at a base end,
A cylindrical body provided with a connection means such as a union type,
On the outer peripheral surface near the base end, which secures the connection operation interval between the connection means and the position of the connection means, a hooking member such as an outward flange serving as a stopper for stopping the tightening external fitting body toward the tip of the circular tube is welded or welded. A tube insertion portion formed integrally with a casting means and having an insertion guide portion formed through a cylindrical portion having a smooth outer peripheral surface from a fixing position of the hook to a tip end of the circular tube; A single or a plurality of sealing grooves are formed on the outer peripheral surface of the portion, and a sealing member is mounted.

[0008] Further, the fastening outer fitting body is constituted by a pair of fastening halves which are provided with fastening means by bolts and nuts and which can be opened or closed in a hinge-like manner or opened and closed in a split manner. On the inner peripheral surface side facing the central axis when they are combined, an inward edge that is hooked by the hook and has an inner diameter that does not become a fastening obstacle, and an outer fitting groove that fits with the reinforcing ridge of the fluid transfer pipe. Is formed.

[0009]

The pipe joint according to the present invention configured as described above is used as a conventional means for connecting reinforcing flexible hoses, connecting means to a pump, and the like.
A connecting means such as a flange of the joint main body is jointly connected and fixed to a connecting section of a pipe joint or a pump provided with a corresponding connecting means, and a reinforced flexible hose is attached to a pipe insertion portion at the tip of the fixed main body of the joint. One end of the hose is externally fitted, and the externally fitted reinforcing flexible hose is tightened and fixed with an external fitting from the outer peripheral surface. In this way, the reinforcing flexible hose externally fitted to the pipe insertion portion is further tightened and secured. A hooked body such as an outward flange formed with an inward edge having an inner diameter that does not become a tightening obstacle formed on the outer fitting when the fitting is externally fitted and that is fixed to a cylindrical portion of a tubular body mainly composed of a joint. A single or a plurality of sealing members having the reinforcing flexible hose attached to the outer peripheral surface of the cylindrical portion by being externally fitted so as to be between the connecting means such as the flange and the like, and tightening so as to be pressed by the tightening external fitting body. Can be.

Therefore, even if a force generated between the hose insertion portion and the reinforcing flexible hose caused by various factors in the direction in which the reinforcing flexible hose separates acts, the reinforcing ridge formed on the outer peripheral surface of the reinforcing flexible hose. Is fitted into an outer fitting groove on the inner peripheral surface of the tightening outer fitting body, and the inward edge of the tightening outer fitting body is hooked on a locking body such as an outward flange fixedly formed on a tubular body mainly composed of the fitting. The main body, the reinforcing flexible hose, and the tightening outer fitting body are completely integrated, and a single or a single piece attached to the outer peripheral surface of the tube portion of the tube insertion portion forming the insertion guide portion via the tube portion Since the plurality of seal members are pressed by the inner peripheral surface of the reinforced flexible hose, inadvertent detachment of the reinforced flexible hose from the pipe joint is reliably prevented, and the outflow of fluid caused by detachment of the reinforced flexible hose,
There is no occurrence of accidents such as collapse of construction sites, roads, etc. due to spills, environmental pollution, etc., and multiplexing due to the elastic mutual contact between the inner peripheral surface components of the reinforced flexible hose and the sealing member and the pressure contact of the sealing member to the bottom of the sealing groove. Since the sealing property is ensured, simple processing such as chamfering the tip to form a nozzle without having to form a bamboo or bellows shape with poor processability to ensure the sealing property at the pipe insertion part It suffices to provide an insertion guide function that is sufficient.

Further, as described in claim 2, the insertion guide portion of the pipe insertion portion mainly composed of the joint to which the fluid transfer pipe is fitted is formed in a bamboo shoot shape, a bellows shape, or a cylindrical shape having a nozzle end. This ensures the sealability at the insertion guide portion and, particularly when the tip is a nozzle-shaped cylinder, can be formed by simple processing of chamfering the tip, and furthermore, the cylinder has Also, a single or a plurality of seal members may be mounted to secure the sealability by the pressing force due to the elasticity of the reinforced flexible hose.

[0012]

DETAILED DESCRIPTION OF THE INVENTION AND

DESCRIPTION OF THE PREFERRED EMBODIMENTS A pipe joint according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an exploded sectional view, FIG. 2 is a front view as viewed from a pipe insertion portion side, and FIG. It is a cross-sectional view of the state, an opening diameter of 100 mm, on the outer peripheral surface of a flexible tube made of soft urethane rubber (a) with a fiber layer interposed, reinforcing ridges (b) made of hard urethane rubber, a pitch of 18 mm A metal pipe joint used for a reinforced flexible hose (F) formed by integral molding means (adhesion means, extrusion molding means, etc.) on a right-handed spiral.
It consists of two parts, (1) and a fastening external fitting (2).

The joint body (1), which is one of the parts, has a cylindrical body (11) having a total length of 210 mm and a pipe insertion portion (12) formed in a bamboo-shape at the distal end portion. A flange (13) for connecting to a suction port of a pump device (not shown) is provided. Further, a cylindrical portion between the flange (13) and the pipe insertion portion (12), and a flange connection operation interval ( On the outer peripheral surface of the cylindrical portion near the flange where the 14) is secured, a latching body (15) consisting of an outward flange that stops the tightening external fitting (2) from moving toward the tip of the circular tube is welded and fixed. On the outer peripheral surface of the cylindrical portion between the hooking body (15) and the pipe insertion portion (12), two sealing grooves (17) for mounting an O-ring (16) are provided for sealing. An O-ring (16) as a member is mounted.

Another one of the components is a fastening external fitting.
(2) is divided into two parts along the axial direction and the united surface (27)
Bolt holes (21) in ears (26) extending to target positions on the diameter line of
The outer fitting halves (2a) and (2b) are provided with the reinforcing flexible hose (F) on the inner surface of each of the outer fitting halves (2a) and (2b).
Female-spiral spiral groove (22) that is screwed into the right-handed spiral reinforcing ridge (b), and a hook (15) of the joint main body (1)
An inward edge (23) with an inner diameter smaller than the outer diameter of the is formed and formed by two sets of bolts (24) and nuts (25).
As shown in FIG. 3, the pipe insertion part (12) of the joint main body (1) and O
At the bottom of the spiral groove (22) and the inner diameters of both side walls of the reinforcing flexible hose (F) externally fitted to the portion where the ring (16) is attached, the O-rings (F) of the two sealing grooves (17) are used. 16) Evenly tightened to the peripheral surface of the cylindrical part on which is mounted, to ensure the sealing performance.

Reinforced flexible hose (F) for tightening external fitting (2)
The external fitting to the joint should be done beforehand without removing the two sets of bolts (24) and nuts (25) so that the inward edge (23) is between the flange (13) and the hook (15). (1) It is preferable to loosely fit the outer part to (1), since the thin parts (bolts, nuts, etc.) will not be lost. The direction of the spiral of the reinforcing ridge (b) is not limited to the right-handed winding as in the embodiment, but when the left-handed winding is used, the spiral groove (23) on the inner surface of the tightening external fitting (2) is naturally formed. It is formed corresponding to this.

[0016] The joint main body (1) having the above structure and a tightening external fitting body.
After the two parts of (2) are manufactured by casting means, the bolt holes (21) of the ears (26), the sealing grooves (17), the hooks (15),
Finishing the inward rim (23), the united surface (27), etc. by machining can reduce the amount of material used to make the hook (15) a gear shape, improve production efficiency, and improve surface roughness of important parts. It is preferable because it can be secured.

Further, the pipe joint of the present invention is configured such that the pipe insertion portion (12) of the joint main body (1) is formed in a bellows shape or a cylindrical shape having a nozzle end to have a guide function at the time of external fitting. One of the outer fitting halves (2a) and (2b) constituting the fastening outer fitting body (2) is openably and closably connected to each other by opening / closing means using a hinge or a connection between a hole and a hook. It is also possible to adopt a configuration in which the sides are fastened with bolts and nuts. Furthermore, the above-mentioned effects can be achieved even if the hook is not limited to the O-ring (16) but uses a square ring. .

In the case where the pipe joint of the present invention is used for a reinforcing flexible hose (F) in which the reinforcing ridges (b) are formed as a large number of annular flanges at a predetermined pitch, the fastening external fitting (2) is used. The inner surface of (1) is a groove to be fitted to the ring flange of the predetermined pitch.

[Brief description of the drawings]

FIG. 1 is an exploded sectional view of a pipe joint according to an embodiment of the present invention.

FIG. 2 is a front view of the pipe joint as viewed from a pipe insertion portion side.

FIG. 3 is a sectional view showing a state in which a reinforced flexible hose is connected to the pipe joint according to the embodiment of the present invention.

[Explanation of symbols]

 (a) Flexible pipe (b) Reinforced ridge (F) Reinforced flexible hose (1) Joint main body (11) Cylindrical body (12) Pipe insertion part (13) Flange (14) Flange connection operation spacing (15) Hook Body (16) O-ring (17) Seal groove (2) Clamping external fitting (2a), (2b) External fitting half (21) Bolt hole (22) Spiral groove (23) Inward edge (24) Bolt (25) Nut (26) Ear (27) Coalescing surface

Claims (2)

[Claims] 1. A pipe joint for use in a fluid transfer pipe having a structure in which reinforcing ridges are integrally formed at the same pitch on an outer peripheral surface of a flexible pipe, the pipe joint having a hooking member such as an outward flange. One end of the transfer tube is fitted externally, and the outer surface of the fitted fluid transfer tube is opened and closed in two so as to fit into the reinforcing ridge on the outer periphery and engage the inward edge with the hook. The joint main body is a tubular body having a connecting means such as a flange at a base end thereof, and a base for securing a connection operation space between the connecting main body and the connecting means. On the outer peripheral surface near the end, a locking body such as an outward flange for stopping movement of the tightening external fitting body toward the tip of the circular tube is integrally formed by welding or casting means, and a fixing position of the locking body. From which the insertion guide section is formed through a cylindrical section having a smooth outer peripheral surface It is provided with a write unit, the outer peripheral surface of the tubular portion, a single or a plurality of forming a seal groove, a pipe joint which is characterized in that a configuration in which the sealing member was attached. 2. The pipe joint according to claim 1, wherein the insertion guide part of the pipe insertion part of the joint main body to which the fluid transfer pipe is fitted is formed in a bamboo shoot shape, a bellows shape, or a nozzle shape at the tip.