JPH1078179A - Pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe joint advantageous for both an assembly work and cost. SOLUTION: This joint has a joint body 2 capable of at least being partly coupled internally to a pipe 1 having many recesses and projections 1A and 1B on the external surface, and a metallic cylindrical member 3 capable of at least being partly coupled externally to the pipe 1. Both sides of the cylindrical member 3 are pressed for contact along an inserting direction, with the joint body 2 and the cylindrical member 3 inserted in the pipe 1. The pressure contact parts 3A and 3A of the cylindrical member 3 are thereby bent and deformed internally for clamping and fixing the pipe 1 by means of the joint body 2 and the cylindrical member 3. Furthermore, a filling material 4 is provided for filling the recesses 1A of the pipe 1 at a position between both of pressure contact parts 3A and 3A before the appearance of pressure contact. Furthermore, locking mechanisms 7 are provided, so as to be locked to the ends of the joint body 2 and the cylindrical member 3 according to the bent deformation of the cylindrical member 3 for stopping the joint body 2, thereby completing the pipe joint.

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 connecting pipes having a large number of irregularities on the outer surface thereof, such as industrial polyvinyl chloride and rubber hoses, or a pipe and a pump.

[0002]

2. Description of the Related Art The above-mentioned pipe joint comprises a tubular member having a larger diameter than the pipe into which the pipe can be inserted, and an expand ring having a smaller diameter than the pipe which can be inserted into the pipe. After inserting the expand ring into the pipe while inserting the pipe, the expand ring is expanded outward using the hydraulic pressure of a hydraulic device or the like, so that the expand ring and the tubular member can be separated from each other. The tube is pinched and fixed. Then, in order to reliably prevent the fitting from coming off the pipe, the pipe is expanded by tightening and connecting one end of the tubular member and one end of the expanding ring using a number of screws. It has been practiced to firmly fix between the ring and the cylindrical member.

[0003] When expanding the expand ring outward as described above, a large force is required. Therefore, the hydraulic pressure of the above-described hydraulic device or the like must be used. Not only is it necessary to expand the expand ring outward, but the diameter of the expand ring increases, but the direction perpendicular to the thickness and radial direction of the expand ring, that is, the expand Since the length of the ring in the insertion direction is reduced, the expansion ring is thicker and the clamping force required for sealing against the pipe is required unless a large expansion ring with a length in the insertion direction is used. Therefore, using such a large expand ring is disadvantageous in terms of both the work of assembling the pipe joint and the cost. In particular, the larger the thickness of the pipe, the more the above-mentioned inconvenience becomes remarkable, and there is room for improvement.

Further, after the tube is sandwiched and fixed between the expanding ring and the cylindrical member, a screw for fastening and connecting one end of the cylindrical member and one end of the expanding ring to each other using a number of screws. Since the stopping operation is required, the fitting operation of the pipe joint is troublesome and troublesome.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has an object to provide a pipe joint which is advantageous in terms of assembly work and cost.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a metal joint body at least partially insertable into a tube having a large number of irregularities on its outer surface, A metal tubular member whose part can be extrapolated is provided, and in a state where the joint body and the tubular member are inserted into the pipe, both sides in the insertion direction of the tubular member are pressed against each other so that the press contact portions are inward. A valley-filling material that is bent and deformed to the side so that the pipe is sandwiched and fixed between the joint body and the tubular member, and that is located between the press-contact portions on both sides before the press-contact, to fill a concave portion of the pipe. And a fitting mechanism for locking the joint body and one end of the tubular member with one end of the tubular member in accordance with the bending deformation of the tubular member to prevent the joint body from coming off, thereby forming a pipe joint. . First, the recess is filled with a valley filling material by arranging the valley filling material in a recess at a specific location at one end of the pipe. Next, the fitting main body is inserted into the pipe, and the pipe in which the fitting main body is inserted is inserted into the tubular member, thereby completing the setting of the pipe fitting. The order of setting the joint body and the tubular member with respect to the pipe joint is not limited to this, and may be performed in any order. Thereafter, both sides of the tubular member in the insertion direction are pressed against the outer surface side of the tube and bent inward, thereby clamping and fixing the tube between the tubular member and the joint body. Therefore, as shown in FIG. 2, as the pressure in the pipe 1 increases, the valley-filling material 4 becomes larger as the force acts on the pipe 1 in the direction in which the pipe joint comes off.
However, since the valley-filling material 4 is in contact with the convex portion 1B in the horizontal direction,
The valley filling material 4 cannot move in the X direction. As a result, the valley filling material 4 converts the force in the X direction acting on the valley filling material into a reaction force in the Y direction. And the sealing effect with the above can be increased. Moreover, the joint body 2 is attached to the tubular member 3 with the bending deformation of the tubular member 3.
Can be locked to prevent the joint main body 2 from falling off, so that the operation for preventing the tubular member 3 from bending can be performed to prevent the joint body 2 from falling off.

[0007] The cross-sectional shape of the convex portion and the valley filling material of the tube is formed in an elliptical shape, and the longitudinal direction of the oval is configured to be along the radial direction of the tube. In other words, because of the structure, the elliptical shape has a property that it is difficult to be deformed by the force in the longitudinal direction thereof. As the pressure increases, the inner diameter of the pipe increases, but the valley-filling material is not deformed, and the reaction force in the Y direction of the valley-filling material can be reliably increased. The sealing effect between the pipe joint and the pipe can be increased. In addition, by forming the convex portion of the pipe in the same manner as the valley filling material, the sealing effect appears as a synergistic effect.

By pressing both sides of the cylindrical member, the convex portion of the tube is crushed inward in the diametrical direction of the tube to expand and deform the convex portion in the insertion direction. Since the valley-filling material adjacent to the valley-filling material is pressed against the convex portion located on the opposite side with the valley-filling material interposed therebetween by the spreading deformation portion of the convex portion, the pressure in the pipe is reduced as described above. By ascending, the valley-filling material can be strongly prevented from moving in the direction of X, and the reaction force in the direction of Y can be increased accordingly, and the sealing effect can be further increased. .

[0009]

1 and 2 show a pipe joint according to the present invention. This pipe joint is provided at both ends of the pipe 1, and the left pipe joint in FIG. 1 is connected to another pipe via a flange portion 1F welded to its connection end, a pump or the like. Is provided with a bolt insertion hole 1K for bolt connection,
An annular member 1G for connecting the pipes to each other using a commercially available connecting tool is welded.

Since the two pipe joints have the same structure except for the shape of the flange portion 1F or the annular member 1G, only the right pipe joint will be described below. Figure 1
As shown in FIG. 3, a metal joint body 2 at least partially insertable into a pipe 1 having a large number of irregularities on the outer surface, and a metal tubular body at least partially insertable into the pipe 1 Member 3
When the joint body 2 and the cylindrical member 3 are inserted into the tube 1, the pressing members 3A and 3A are bent inward by pressing both sides of the cylindrical member 3 in the insertion direction. The pipe 1 is configured to be clamped and fixed between the joint body 2 and the cylindrical member 3 and is located between the press contact portions 3A on both sides before the press contact to fill the recess 1A of the pipe 1. A locking mechanism 7 for providing the filling material 4 and locking the joint body 2 and one end of the tubular member 3 with one end of the tubular member 3 to prevent the joint body 2 from coming off is provided. To form the pipe joint.

The pipe 1 is used for transporting a fluid such as water or earth and sand. The pipe 1 has a mesh metal thin plate 6 inside a pipe main body 5 made of hard vinyl chloride synthetic resin. On the outer surface of the tube main body 5, a convex portion 1B having an elliptical cross section is spirally provided. The tube 1 may be made of a hard material other than hard vinyl chloride synthetic resin. Further, the metal thin plate 6 may be omitted. The convex portion 1B is formed separately and melt-bonded to the outer surface of the tube main body 5. Alternatively, the separately formed convex portion 1B may be embedded when the tube main body 5 is formed, or they may be integrally formed. May be.

The annular member 1G is welded and fixed to the rear end of the joint body 2 in the insertion direction, and the outer diameter of the front portion 2A of the joint body 2 in the insertion direction is determined by the inner diameter of the pipe 1. And the outer diameter of the rear side portion 2B in the insertion direction is slightly larger than the inner diameter of the pipe 1. When the joint body 2 is inserted, the front side in the insertion direction becomes smaller. The outer surface of the intermediate part 2C connecting the side part 2A and the rear part 2B in the insertion direction comes into contact with the inner surface of the pipe 1 so that the insertion position of the joint body 2 can be regulated. The joint main body 2 may be formed of a cylindrical shape having the same inner diameter in the longitudinal direction, and the shape of the joint main body 2 is not limited thereto.

The tubular member 3 has a cylindrical shape having the same thickness and the same inner diameter in the insertion direction, and the length of the tubular member 3 in the insertion direction is larger than the length of the joint body 2 in the insertion direction. It is set short. The length of the tubular member 3 in the insertion direction may be the same as the length of the joint body 2 in the insertion direction, and the shape of the tubular member 3 is not limited thereto.

The valley filling material 4 is formed in the same shape and size as the cross-sectional shape of the convex portion 1B.
As shown in FIG. 2, it is made of one hard vinyl chloride synthetic resin and is wound around the specific recess 1A. It should be noted that the valley filling material 4 may be composed of a single member or a plurality of ring-shaped members. Further, the material of the valley filling material 4 may be a hard material other than the hard vinyl chloride synthetic resin. The valley filling material 4 and the convex portion 1B may be formed in various shapes such as a rectangular shape, a semicircular shape, and a trapezoidal shape in addition to the elliptical cross-sectional shape.

The locking mechanism 7 has a ring-shaped projection 8 having a spherical surface welded to the inner surface of the rear end of the cylindrical member 3 in the insertion direction. And a projection 9 having a square cross section welded to the outer surface of the rear portion 2B in the insertion direction of the joint body 2.

Therefore, as shown in FIG. 3, first, a valley filling material 4 is wound around a specific outer surface of the pipe 1, and then the joint body 2,
The tubular members 3 are inserted into the tube 1 in this order. Thereafter, both ends in the insertion direction of the tubular member 3 are pressed inward (crimped).
As a result, as shown in FIG. 2, the pipe 1 is sandwiched and fixed between the tubular member 3 and the joint body 2. By this pressing, one of the projections 8 is brought closer to the other of the projections 9 so that the two 8, 9 are locked in the horizontal direction,
The joint body 2 is prevented from falling off. The order in which the joint body 2 and the tubular member 3 are inserted into the pipe 1 may be reversed. As shown in FIG. 2, the front end 3T of the tubular member 3 in the insertion direction is inclined so that the end 3T is located more outward toward the end, so that, for example, the press-contact portion 3A and the end 3T are horizontal. When formed in a straight line in the direction, only approximately half of the convex portion 1B is crushed by the end 3T so that the tube 1 is not broken at the crushed portion.

In order to prevent a gap S from being generated between the rightmost one of the convex portions 1B shown in FIG. The valley-filling material 4 may be provided between them, and they may be disposed in close contact with each other. In this case, the movement of the tubular member 3 in the insertion direction can be more reliably prevented.

[0018]

According to the first aspect of the present invention, a concave portion of a specific pipe is filled with a valley filling material, and both sides of the tubular member are bent inward to form a thick or large tubular member or joint. Without using the main body, it is possible to firmly prevent the tubular member from coming off, and the one that presses in from the outer side is far more in comparison with the conventional one in which the expand ring is expanded outward. Thus, it is possible to provide a pipe joint which is advantageous in terms of assembly work and cost. In addition, the stopper of the joint body can be prevented by locking just by pressing the cylindrical member, and this point is advantageous in terms of assembly work.

According to the second aspect, the sealing effect can be increased without increasing the pressure contact force of the tubular member only by forming the cross-sectional shape of the convex portion of the pipe and the valley filling material into an elliptical shape. .

According to the third aspect, the valley-filling material can be pressed by the crushed convex portion, so that the sealing effect can be further enhanced.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view of a pipe joint.

FIG. 2 is a longitudinal sectional side view of a main part of a pipe joint.

FIG. 3 is an exploded perspective view of a pipe joint.

[Explanation of symbols]

 Reference Signs List 1 pipe 1A concave part 1B convex part 1F flange part 1G annular member 1K bolt insertion hole 2 joint body 3 tubular member 3A pressure contact part 3T front end part 4 valley filling material 5 pipe body 6 metal thin plate 7 locking mechanism 8 protrusion 9 Projection S Clearance X, Y direction

Claims (3)

[Claims] 1. A metal joint body at least partially insertable into a tube having a large number of irregularities on an outer surface, and a metal tubular member at least partially insertable into the tube, In a state where the joint body and the tubular member are inserted into a pipe,
By press-contacting both sides in the insertion direction of the tubular member, the press-contact portions are bent inwardly to be clamped and fixed to the pipe by the joint body and the tubular member. A valley filling material for filling the concave portion of the pipe is provided between the pressure contact portions, and is locked at one end of the joint body and the tubular member along with the bending deformation of the tubular member, thereby securing the joint body. A pipe joint provided with a locking mechanism for preventing falling off. 2. The tube according to claim 1, wherein the convex portion and the valley filling material of the tube are formed in an elliptical cross-section, and a longitudinal direction of the ellipse is along a radial direction of the tube. Fittings. 3. Pressing both sides of the tubular member to crush the convex portion of the tube inward in the diametrical direction of the tube to expand and deform the convex portion in the insertion direction. The pipe joint according to claim 1, wherein the bulging material adjacent to the valley filling material is pressed against the protruding portion located on the opposite side of the valley filling material by the expanded deformation portion of the convex portion.