JP2000297888A - Joint for large-diameter pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliably connect large-diameter pipes together at high airtightness by pressing-in and fixing a seal body constituted of fixed rings forming coupling sections and seal pieces integrally molded with an elastomer resin on the inner peripheries of the fixed rings and pressed to the end section outer peripheries of the large-diameter pipes to be connected to the axial end sections of connecting port sections. SOLUTION: Each fixed ring 15 has an inner diameter nearly matched with the outer diameter of an outside cylinder section inserted into the end section outer periphery of each large-diameter section (connecting port section) 9 and a large-diameter pipe, and a plurality of pawl sections as coupling sections are integrally molded around the axis on the inner periphery of the outside cylinder section. Seal members 13 are pressed-in and fixed to the end section of each large-diameter section (connecting port section) 9 of a joint body 3 respectively. Each seal member 13 is double-molded with seal pieces 17 on the inner face of a fixed ring 15, the fixed ring 15 is molded with the same synthetic resin as that of the joint body 3, and the seal piece 17 is molded with an olefin elastomer resin. Large-diameter pipes can be reliably connected together with high airtightness over a long period.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is buried in a structure such as soil or a building to allow a fluid (air, water, oil, gas, etc.) to flow therethrough, and to house and carry electric wires and various signal cables. TECHNICAL FIELD The present invention relates to a large-diameter pipe joint used for connecting large-diameter pipes to each other.

[0002]

SUMMARY OF THE INVENTION The present applicant has previously described, as a pipe joint for connecting drain pipes for leading a drain discharged from an air conditioner to the outside, for example, an elastomer on the inner peripheral surfaces of both ends in the axial direction of the joint body. A ring-shaped stopper member formed of a synthetic resin such as polypropylene or polyethylene, which is formed integrally with the seal member around the axis by resin and engages with the outer peripheral surface of the end of the pipe connected to the both ends to prevent the seal member from coming off. The one with the attached was proposed.

[0003] Since this kind of pipe joint can be manufactured by forming a seal member on the joint body in a double-molding manner, it is possible to reduce the manufacturing cost and to simplify the installation work and shorten the construction period. ing.

[0004] The drain pipe connected by the pipe joint is a small-diameter pipe and the pipe joint itself has a small diameter. Therefore, the mold used for double-molding the seal member on the joint body is small-sized and therefore low-cost. Because the mold can be used,
Although it is possible to avoid an increase in molding cost, a large-diameter pipe joint, which is a target of the present invention, is large in itself, and therefore a large-sized mold is required to double-mold a seal member. Therefore, there is a problem that the production cost is significantly increased due to the necessity of a high-cost mold.

In order to reduce the manufacturing cost without using a large mold, a pipe joint is constituted by three parts, a joint body, a seal member and a retaining member, and can be assembled at a construction site. However, in this type of pipe joint, it has been extremely difficult to assemble the seal member and the retaining member with high precision to the joint body. If the assembling precision is poor, there is a problem that a sealing failure occurs, a liquid leaks from the connecting portion, or water enters from outside to damage the housed cables and the like.

In order to solve this drawback, it is conceivable to attach a seal member to the joint body by using an automatic assembling device at a factory. However, since the seal member itself has elasticity, it is difficult to maintain a fixed shape. When an automatic assembling apparatus is used, a mechanism for giving the seal member a fixed form is required, and the cost of the apparatus itself is increased, thereby increasing the manufacturing cost.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional disadvantages, and an object of the present invention is to provide a large-diameter pipe capable of reliably connecting large-diameter pipes with high airtightness. To provide a coupling.

Another object of the present invention is to provide a joint for a large-diameter pipe in which a seal member can be efficiently attached to a joint main body with high accuracy and simple operation.

Another object of the present invention is to provide a large-diameter pipe joint which can be adapted to automation of an assembling operation and can reduce manufacturing costs.

[0010]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a pipe joint for connecting large-diameter pipes to each other, in which the inner ends of the large-diameter pipes connected to each other in the axial direction are aligned with each other so that the inner diameters of the large-diameter pipes are matched. A connection body in which connection ports larger than the outer diameter of the large-diameter pipe are formed at both ends in the axial direction, and engagement portions are respectively formed around the outer peripheral surface axis of the connection port; and each connection port. A fixing ring having an inner diameter that can be inserted into each end in the axial direction and having an engaging portion that engages with the engaged portion around the inner peripheral surface axis, and an integral molding of an elastomer resin on the inner peripheral surface of the fixing ring. And a sealing member made of a sealing piece elastically deformed and pressed against the outer peripheral surface of the end of the large-diameter pipe to be connected. The sealing member is press-fitted into each axial end of the joint main body to connect the inner periphery of the connection port. A seal piece was attached to the side.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Embodiment 1 FIG. 1 is an exploded perspective view of a large diameter pipe joint, FIG. 2 is a half sectional view of a large diameter pipe joint, and FIG. 3 is a partially cutaway perspective view showing a seal member.

The joint body 3 of the large-diameter pipe joint 1 is made of a synthetic resin based on polypropylene, polyethylene or the like having weather resistance and resistance to decomposition by bacteria. It is slightly larger and has an axial length that allows the axial end of the large-diameter tube 5 to be inserted and held. The large-diameter pipe 5 includes the joint body 3
It is made of the same synthetic resin or ceramics as ceramic.

An abutment wall 7 is integrally formed on the inner peripheral surface of the joint body 3 at the intermediate portion in the axial direction with an inner diameter corresponding to the inner diameter of the large-diameter pipe 5 around the axis. The press-fit length is set by pressing the axial end face of the large-diameter pipe 5 to be inserted.

Large-diameter portions 9 are integrally formed at both ends of the joint body 3 in the axial direction, and a projection 11 as an engaged portion is integrally formed on the outer peripheral surface of the end of each large-diameter portion 9 around the entire axis. Molded. Each of the protrusions 11 has an end surface formed on a tapered surface 11a inclined toward an intermediate portion of the joint body 3, and an inner wall surface formed on an upright surface 11b. The projections 11 may be formed integrally with a large number of projections 11 at predetermined intervals around the axis, in addition to the above-described one.

A seal member 13 is press-fitted and fixed to the end of each large diameter portion 9 in the joint body 3. Each seal member 13 is formed by double-molding a seal piece 17 on the inner surface of a fixed ring 15. The fixed ring 15 is formed of the same synthetic resin as the joint body 3, and the seal piece 17 is formed of an olefin-based elastomer resin.

Each of the fixing rings 15 has an inner diameter substantially matching the outer diameter of the outer cylindrical portion 15a and the outer diameter of the large-diameter tube 5 fitted on the outer peripheral surface of the end of each large-diameter portion 9, and the axial end surface of the large-diameter portion 9. And a plurality of claw portions 15c as an engaging portion that goes over the protrusion 11 and engages with the rising surface on the inner peripheral surface of the outer cylindrical portion 15a around the axis. It is integrally molded. The outer cylindrical portion 1 is used as the claw portion 15c.
It may be a single-piece shape integrally molded around the axis of the inner peripheral surface of 5a.

On the inner surface of the ring portion 15b of the fixing ring 15, the base end of the seal piece 17 is double-formed around the axis so as to be fused. Each seal piece 17 extends toward the center of each large-diameter portion 9 and can be bent and elastically deformed. A hole (not shown) for injecting the elastomer resin when the sealing piece 17 is double-molded on the fixing ring 15 is filled with a part of the base end of the sealing piece 17 to increase the fusion strength. I have.

Next, the connecting operation of the large diameter pipes 5 by the large diameter pipe coupling 1 will be described. FIG. 4 is a half sectional view showing a state of connection between large-diameter pipes.

First, the operation of attaching the seal member 13 to each large-diameter portion 9 of the joint body 3 will be described. A pressurizing device (not shown) is used to seal the end of each large-diameter portion 9 of the joint body 3. After each member 13 is set, each seal member 13 is pressurized in the axial direction to press-fit the outer cylindrical portion 15a of the fixing ring 15, and the claw portion 15c slides the tapered surface 11a of the projection 11 so that the outer cylindrical portion 15a slides. After overcoming the protrusion 11 by elastically deforming in the radially expanding direction, the upright surface 11b
Side, the outer cylindrical portion 15a is engaged by elastic return. Thereby, each seal member 1 is attached to the end of each large-diameter portion 9.
Fix 3

Next, the end of the large-diameter pipe 5 is inserted into the large-diameter section 9 of the large-diameter pipe joint 1 to which the sealing member 13 is attached.
When the end face is press-fitted to a position where it comes into contact with the side surface of the contact wall 7, the sealing piece 17 is elastically deformed in the press-fitting direction and the outer circumferential direction along with the press-fitting of the large-diameter pipe 5, on the outer peripheral face of the end of the large-diameter pipe 5. Are brought into sliding contact with each other by their elastic force, thereby connecting the large-diameter pipe joint 1 and the large-diameter pipe 5 in an airtight manner.

In the above-mentioned connected state, the sealing piece 17 pressed against the outer peripheral surface of the end of the large-diameter pipe 5 is pressed against the inside of the large-diameter pipe joint 1 in a bent state. Even when a fluid such as water that has entered the inner peripheral surface side of the large-diameter pipe coupling 1 acts, the pressure of the fluid urges the seal piece 17 to be pressed against the outer peripheral surface of the large-diameter pipe 5. Since the pressing force can be increased,
The airtight connection between the large-diameter pipes 5 can be reliably maintained.

In the present embodiment, each large-diameter portion 9 of the joint body 3 is used.
When molding the seal member 13 attached to the fixing ring 15, the seal piece 17 is double-molded to the fixing ring 15 to form a small mold, and the manufacturing cost is reduced by reducing the mold cost. Can be reduced.

The sealing piece 17 itself is easily elastically deformed easily, and the workability of mounting the single piece is extremely poor. However, by integrating the sealing piece 17 into the fixing ring 15, the mounting of the sealing member 13 to the joint body 3 is achieved. Workability can be improved.

Embodiment 2 In Embodiment 1, the large-diameter pipe joint 1 for connecting the large-diameter pipes 5 to each other linearly has been described. In this embodiment, the axial direction of the large-diameter pipe 5 is changed at a predetermined angle. The present invention relates to an elbow joint for a large diameter pipe that is connected while being connected.

FIG. 5 is an overall perspective view showing an elbow joint for a large diameter pipe, FIG. 6 is a partial longitudinal sectional view, and FIG. 7 is a partial sectional view showing a connected state.

The joint body 53 of the large-diameter pipe elbow joint 51 has an inner diameter that matches the inner diameter of the large-diameter pipe 5 to be connected, and is curved so that the axes at both ends are orthogonal to each other. The axial angles at both ends may be in an arrangement relationship intersecting at, for example, 120 degrees other than the above angles.

The joint body 5 whose axes are orthogonal to each other
The third connection port 55 has an inner diameter substantially matching the outer diameter of the large-diameter pipe 5, and a concave portion 57 having an inner diameter slightly larger than the connection port 55 is integrally formed on the inner peripheral surface of each end.

An engagement groove 59 as an engaged portion is formed on the outer peripheral surface of each connection port 55 around the axis. The seal members 13 are press-fitted and fixed to the ends of the connection ports 55, respectively. The seal member 13 and other components are the same as those described in the first embodiment, and a detailed description thereof will be omitted.

Embodiment 3 This embodiment relates to a large diameter pipe cheese joint for branching or collectively connecting at least three or more large diameter pipes 5.

FIG. 8 is a front view of a large-diameter pipe cheese joint.
FIG. 9 is a partial sectional view, and FIG. 10 is a partial sectional view showing a connection state.

The joint body 73 of the large-diameter pipe cheese joint 71 has an inner diameter that matches the inner diameter of the large-diameter pipe 5 to be connected.
It is formed in a front horizontal T-shape having 77 and 79. In addition, as the joint main body 73, in addition to the above-mentioned horizontal T-shape, any of a shape in which the connection ports 75, 77, 79 are arranged at an angle of about 120 degrees or a shape in which, for example, four connection ports are arranged There may be.

Each of the connection ports 75, 77 and 79 is a large-diameter pipe 5
The engagement groove 75b, 77b, 79b as an engaged portion is formed around the axis on the outer peripheral surface of the end portion. In addition, connection ports 75, 77, 79
At the respective ends, concave portions 75a and 79a having a slightly larger inner diameter than the connection ports 75, 77 and 79 (the concave portions of the connection port 77 are not shown) are integrally formed.

Each of the connection ports 75, 77, and 79 has a seal member 13 similar to the seal member described in the first embodiment.
Is press-fitted and fixed. The seal member 13 and other components are the same as those described in the first embodiment, and a detailed description thereof will be omitted.

Embodiment 4 This embodiment relates to a large-diameter pipe U-shaped joint which turns the pipe direction of the large-diameter pipe 5 by 360 degrees.

FIG. 11 is a front view of a U-shaped joint for a large-diameter pipe,
FIG. 12 is a partial sectional view, and FIG. 13 is a partial sectional view showing a connection state.

Joint body 9 of U-shaped joint 91 for large diameter pipe
Reference numeral 2 denotes an inner diameter substantially matching the inner diameter of the large-diameter pipe 5 to be connected, and has a U-shaped curved shape. Connection ports 93 and 95 are integrally formed in the upper part of the drawing.
Each of the connection ports 93 and 95 has an inner diameter that matches the outer diameter of the large-diameter pipe 5, and a concave portion 93 a having an inner diameter larger than each of the connection ports 93 and 95 (the concave portion of the connection port 95) is formed on the inner peripheral surface of the end. Are not shown).

At the ends of the connection ports 93 and 95, engagement grooves 93b and 95b as engaged parts are formed around the axis, and the sealing member 13 similar to that of the embodiment is provided with its claw 15c. Are press-fitted and fixed so as to engage with the engaging grooves 93b and 95b. The other fairness is the same as in the first embodiment, and the same reference numerals are given and the description is omitted.

In the first to fourth embodiments, the joint body 3
Large diameter portion 9 or connection port portions 55, 75, 77, 79, 9
The projections 11 are integrally formed around the axis on the outer peripheral surface of the fixing member 3 and the claw 1 are formed on the inner peripheral surface of the fixing ring 15 of the sealing member 13.
5c is integrally formed around the axis, and the seal member 13 is press-fitted into the large diameter portion 9 or the end of the connection port 57, 75, 77, 79, 93, 95, and the claw 15c is engaged with the projection 11. Although the structure was adopted in which the large diameter portion 9 or the connection ports 57, 75, 77, 79, 93, 95 were used as shown in FIG.
A plurality of protrusions 101 are integrally formed on the outer peripheral surface of the end at predetermined intervals around the axis, and a plurality of protrusions 101 are formed on the inner peripheral surface of the outer cylindrical portion 15a of the fixing ring 15 with the axial length of the protrusions 101 inter-interval. The claws 103 are integrally formed around the axis corresponding to the gap between the protrusions 101, and each claw 103 is
After the fixing ring 15 of the seal member 13 is inserted into the end of the large-diameter portion 9 in a state where the claw 103 is engaged with the projection 101, the fixing ring 15 is rotated. A structure in which the seal member 13 is fixed to each end of the joint main bodies 3, 53, 73, 92 may be adopted.

In this case, the claw 1 to be rotated is provided on the outer peripheral surface of the large-diameter portion 9 corresponding to the lower side in the rotation direction of the projection 101.
A restricting wall (not shown) that abuts on the fixing ring 15 to stop the fixing ring 15 from rotating may be provided. Further, a cam surface (not shown) which becomes constant after the width gradually increases is provided on the inner surface of the protruding portion 101, and the large diameter portion 9 or the connection ports 57, 75, 77 are provided.
When the fixing ring 15 of the seal member 13 inserted in 79, 93, 95 is rotated, the seal member 13 can be pressed against the large-diameter portion 9 by the claw 103 that slides on the cam surface of the projection 101. At the same time, the return may be regulated by the frictional force between the two.

[0040]

As described above, according to the present invention, large-diameter pipes can be reliably connected with high airtightness over a long period of time.
Further, according to the present invention, the seal member can be efficiently attached to the joint body with high accuracy and simple operation. Further, the present invention is applicable to automation of an assembling operation, and can reduce manufacturing costs.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a large-diameter pipe joint.

FIG. 2 is a half sectional view of a joint for a large diameter pipe.

FIG. 3 is a partially cutaway perspective view showing a seal member.

FIG. 4 is a half sectional view showing a connection state between large-diameter pipes.

FIG. 5 is an overall perspective view showing a large diameter pipe elbow joint.

FIG. 6 is a partial longitudinal sectional view.

FIG. 7 is a partial cross-sectional view showing a connection state.

FIG. 8 is a front view of a large diameter pipe cheese joint.

FIG. 9 is a partial sectional view.

FIG. 10 is a partial cross-sectional view showing a connection state.

FIG. 11 is a front view of a large-diameter pipe U-shaped joint.

FIG. 12 is a partial sectional view.

FIG. 13 is a partial sectional view showing a connection state.

FIG. 14 is a perspective view showing a modification of the fixing structure of the seal member.

[Explanation of symbols]

1-large-diameter pipe joint, 3-joint body, 5-large-diameter pipe, 11-projecting portion as engagement portion, 13-seal member, 1
5-fixing ring, 17-seal piece

Claims (9)

[Claims] In a pipe joint for connecting large-diameter pipes, the large-diameter pipes to be connected have inner diameters which are fitted in such a manner that inner ends of the large-diameter pipes are aligned with each other in an axial direction. A connection main body in which connection ports larger than the outer diameter are formed and engagement portions are formed around the outer peripheral surface axis of the connection port, respectively, and can be inserted into each axial end of each connection port. A fixing ring having an inner diameter and an engaging portion that engages with an engaged portion around an inner peripheral surface axis, and an end portion of a large-diameter pipe integrally molded and connected to an inner peripheral surface of the fixing ring with an elastomer resin. A large-diameter seal member consisting of a seal member elastically deformed on the outer peripheral surface and pressed against the seal member. The seal member is press-fitted at each axial end of the joint body so that the seal member can be attached to the inner peripheral side of the connection port. Pipe fittings. 2. The joint for a large diameter pipe according to claim 1, wherein the connection port is provided with a concave portion having an inner diameter that allows elastic deformation of the seal piece accompanying press fitting of the large diameter pipe. 3. A seal piece integrally formed with a fixing ring according to claim 1, wherein a distal end portion extends outward in the axial direction of the joint body, and a concave portion is formed on an inner side surface of the joint body around the axis. A large-diameter pipe joint that enables elastic deformation of the seal piece during press-fitting of a large-diameter pipe. 4. The joint for a large diameter pipe according to claim 1, wherein the engaged portion comprises a projection provided entirely around the axis of the outer peripheral surface of the end of the connection port. 5. A large-diameter pipe joint according to claim 1, wherein the engaged portion comprises a plurality of projections provided at predetermined intervals around an axis with respect to the outer peripheral surface of the end of the connection port. 6. The joint for a large diameter pipe according to claim 1, wherein the joint body is formed by bending an axial direction at a connection port portion at a predetermined angle. 7. A joint for a large-diameter pipe according to claim 6, wherein the joint body is formed in an L-shape in which the axial direction at the connection port is orthogonal. 8. The joint for a large-diameter pipe according to claim 6, wherein the joint body is formed in a U-shape in which the axial direction at the connection port is parallel. 9. A joint body according to claim 1, wherein at least three or more connection ports are provided at a predetermined angle in their axial directions, and at least three or more large-diameter pipes are branched or assembled. Fitting for large diameter pipes that can be piped.