JP3114049B2 - Elbow for pipe connection - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe connecting elbow for connecting a water pipe, a gas pipe, and the like, and more particularly to a pipe connecting elbow having a telescopic function and a movable function in up, down, left and right directions.

[0002]

2. Description of the Related Art Conventionally, when pipes such as water pipes or fire extinguisher pipes are laid underground or the like, pipes having various structures have been employed as pipe joints for connecting the pipes. For example, a flange joint, a universal joint, a ball joint, and the like are known. In the case of a flange joint, the flanges protruding from the opposed open ends of the pipes are joined together and connected by bolts and nuts. In the case of a universal joint or a ball joint, the end of one pipe is replaced with a spherical end. There is widely known a structure which is formed so that the outer peripheral surface of the other end of the tube is inserted into the spherical end so as to be freely bent through a sealing material. In addition, a connection structure is also adopted in which the outer peripheral surface of the end of one tube is connected to the inner peripheral surface of the end of the other tube via a sealing material so as to be able to expand and contract in the length direction.

[0003]

However, in the case of a flange joint, the pipes are firmly connected to each other, and in the case of a universal joint or a ball joint, they can bend each other, but are flexible in the longitudinal direction. On the contrary, it is difficult to bend each other in a pipe connection structure which is connected to extend and contract in the length direction. Therefore, when the ground vibrates, or when the ground vibrates, or when the ground fluctuates due to sedimentation, uplift, etc., due to a vehicle that frequently travels on the ground, the joint cannot absorb the fluctuations, and the pipe may deform. In addition, there is a risk of breakage or further detachment from the joint.

[0004] In addition, even if it is not a large earthquake, if a weak earthquake repeatedly occurs, the joints may be gradually loosened or tensile deformation may be caused little by little by the vibration of the ground. Did not.

[0005] The present invention has been made in view of such problems, and the joints may be disengaged, bent, or cracked even when the ground changes due to an earthquake or the like or the displacement of the piping. It is an object of the present invention to provide a pipe connection elbow with high reliability of a joint portion, which prevents occurrence of cracks, breakage, and loosening of a joint portion.

[0006]

In order to achieve the above-mentioned object, a pipe connecting elbow according to the present invention comprises a first joint short pipe having a connecting port tube projecting from one side and an intermediate joint short pipe section. And a second joint short pipe integrally provided in an orthogonal state, and a first joint base of the first pipe is slidably and slidably in the longitudinal direction at one end opening of the first joint short pipe. The other end of the first joint short pipe is slidably inserted in the first joint short pipe, and the other end of the first joint short pipe is slidably inserted in the opening. The body and the first joint base are connected by a first rod body having a fixed length.

[0007] Further, the one end opening of the intermediate joint short pipe is slidably and rotatably fitted in the length direction in the connection mouth tube part of the first joint short pipe, and the intermediate joint short pipe is fitted. Is connected to the inside of the first joint short pipe via the connection port tubular part, and the other end opening of the intermediate joint short pipe is slidably inserted into the opening to form a disk-shaped intermediate sealing plug. And the intermediate sealing plug is connected to a central portion of the connection port cylinder by an intermediate rod having a predetermined length.

In addition, the internal passage of the second joint short pipe communicates with the passage in the intermediate joint short pipe in a vertically intersecting manner, and the second pipe is connected to one end opening of the second joint short pipe. A disk-shaped second sealing plug in which the second joint base is slidably and rotatably inserted in the length direction and the other end opening is slidably inserted in the opening. The second sealing plug is closed and the second fitting base is connected with a second rod having a predetermined length.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The above-mentioned pipe connection elbow is made of a metal or a hard synthetic resin, and the first pipe and the second pipe are respectively screwed into the joint bases of the first and second joint short pipes. And the first pipe and the second pipe communicate with each other through the connection elbow to flow a fluid such as water.
The pipes using this pipe connection elbow are various plumbing equipment such as general water pipes and fire extinguishing equipment pipes supplied to homes, such as pipes buried underground or piped inside buildings. Is applied.

Normally, when the first short pipe and the second short pipe are orthogonal to each other and the second short pipe connected to the second short pipe is laid horizontally underground or the like, the first short pipe is connected to the first short pipe. The first pipe connected to the short pipe is piped vertically upward. In this state, the joint base to which the first pipe is connected is slidably inserted in the opening of one end of the first joint short pipe in the length direction via the sealing material. Even when the second pipe sinks or moves up in the ground, it can absorb a variation in the pipe by sliding movement even when the second pipe sinks or moves up in the ground.

At this time, the joint base is connected via a first rod body to a first sealing plug which is slidably fitted to the opening at the other end of the first joint short pipe via a sealing material. As a result, the joint base and the first sealing plug slide integrally within the first joint short pipe. Since the sealing portions at both ends of the first joint short pipe with respect to the fitting base and the first sealing plug have the same diameter, the fluid pressure acting on the fitting base side and the first sealing plug side is always the same. Therefore, the first pipe does not move in the length direction depending on the fluid pressure.

On the other hand, the second pipe connected to the second short pipe of the joint via the second fitting base also expands and contracts in the longitudinal direction similarly to the first pipe, and the fitting base is connected to the second rod. Since it is integrally connected to the second sealing plug via the body and these sealing portions are formed to have the same diameter, the second pipe moves in the length direction depending on the fluid pressure flowing inside. Never. Further, the intermediate joint short pipe portion provided integrally with the second joint pipe is slidably fitted via a sealing material to a connection port tubular portion protruding from one side of the first joint short pipe. Because, the first joint short pipe and the second joint short pipe are close to each other,
It is movable in the direction of detachment, and can absorb the fluctuation amount of the pipe in this direction. Also in this case, the connection port cylinder and the intermediate plug inserted into the other end of the intermediate joint short pipe are connected via the intermediate rod, and the seal portions of both are formed to have the same diameter. Therefore, the intermediate joint short pipe does not move in the length direction depending on the fluid pressure flowing through the inside.

The first joint short pipe to which the first pipe is connected has its connection port portion rotatably connected to the one end opening of the intermediate joint short pipe portion of the second joint short pipe. And the first and second fitting bases connecting the first and second pipes are rotatably connected to the first and second fitting short pipes, respectively. The first pipe is rotatable around the pipe axis of the second pipe, and the second pipe is rotatable about the pipe axis of the first pipe, and is rotatable around the connection port cylinder. Therefore, these first and second pipes can be rotated up and down, front and rear, and left and right through pipe connection elbows to cope with fluctuations in the ground and the like in that direction, and further, without generating internal stress. It can respond.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
In FIG. 1, reference numeral 1 denotes a first joint short pipe having one end (upper end) opening connected to a first pipe A, and connected to one side thereof in a direction perpendicular to the pipe axis of the first joint short pipe 1. A stopper ridge 1b for preventing the first fitting 3 to be described later is formed on an inner peripheral surface which is formed integrally with the barrel portion 1a and has an appropriate length dimension from the opening end on the other end side toward the inside. (Shown in FIG. 2).
Reference numeral 2 denotes a second joint short pipe having the same diameter and substantially the same length as the first joint short pipe 1, and an intermediate joint short pipe orthogonal to the second joint short pipe 2 at the center in the length direction. A part 2a is provided integrally, and one end opening of the intermediate joint short pipe part 2a is slidable in the length direction through a sealing material 11 to the connection port cylinder part 1a of the first joint short pipe 1 and It is rotatably connected around the connection mouth tube part 1a. B is a second pipe connected to one end opening of the second joint short pipe 2.

As shown in FIG. 2, a first joint base 3 having a short tubular shape is inserted into an opening of one end of the first joint short pipe 1 as shown in FIG. The first joint base 3 has a small-diameter short cylindrical portion 3a of a fixed length which is slidably inserted in the first joint short tube 1 slidably in the longitudinal direction and rotatably in the circumferential direction. 1 has a large-diameter short cylindrical portion 3b protruding from the open end thereof, and has an outer peripheral surface of the small-diameter short cylindrical portion 3a which is longer than an annular sealing material 12 embedded in the inner peripheral surface of the open end of the first joint short pipe 1. Slidable in the direction and rotatably in the circumferential direction. And, a female thread portion 3c for connecting the first pipe A by screwing a screw portion provided on the outer peripheral surface of the open end of the first pipe A to the inner peripheral surface of the open end of the large diameter short cylindrical portion 3b is provided. On the other hand, a cross-shaped support piece 3d having an outer end integrally connected to the inner peripheral surface of the small-diameter short cylindrical portion 3a is provided in the open end of the small-diameter short cylindrical portion 3a. Is provided with a screw hole 3e in which a screw portion at one end of the first rod body 4 is screwed.

Further, at the opening of the other end of the first joint short pipe 1, a first sealing plug 5 having an annular sealing material 13 mounted on its outer peripheral surface is provided.
And the other end of the first rod body 4 is inserted through the center of the first sealing plug 5 and is integrally fixed by a nut 4a. The first sealing plug 5 has its outer peripheral sealing material 13 slidably slidably in contact with the inner peripheral surface of the opening of the first joint short pipe 1, and the first coupling base via the first rod body 4. 3 and is configured to slide in the longitudinal direction of the first joint short pipe 1 integrally. The length of expansion and contraction of the first joint base 3 in the longitudinal direction with respect to the first joint short pipe 1 is determined by the position at which the lower end surface of the large-diameter short tube portion 3b contacts the upper end surface of the first joint short pipe 1; That is, it is the length dimension during which the first sealing plug 5 comes into contact with the locking ridge 1b from the other end opening of the first joint short pipe 1.

Also, in the open end of the connection mouth tube portion 1a of the first joint short pipe 1, a cross-shaped support piece 1c having an outer end integrally connected to the inner peripheral surface of the connection mouth tube portion 1a. Is provided,
One end of the intermediate rod body 6 is connected to the center of the support piece 1c by screwing, and the other end of the intermediate rod body 6 is inserted into the other end opening of the intermediate joint short pipe portion 2a. It is integrally connected to the center of the intermediate sealing plug 7. An annular sealing member 14 is mounted on the outer peripheral surface of the intermediate sealing plug 7, and the other end opening of the intermediate joint short pipe portion 2a is slidable in the longitudinal direction on the sealing member 14 in the circumferential direction. Slidably in contact with. A locking projection 2b for preventing the intermediate joint short pipe 2a from coming off is provided on the inner peripheral surface appropriately dimensioned in the pipe axis direction from the other end of the intermediate joint short pipe 2a. Therefore, the intermediate joint short pipe section 2a
The length of expansion and contraction in the pipe axis direction is set to a length during which the intermediate sealing plug 7 comes into contact with the locking projection 2b from the other end of the opening of the intermediate joint short pipe portion 2a.

The second joint short pipe 2 is located below the intermediate joint short pipe 2a at the center in the longitudinal direction of the intermediate joint short pipe 2a formed to have the same diameter as the second joint short pipe 2. The half portion is formed integrally with the central upper half portion in the longitudinal direction orthogonal thereto, so that the hollow interior of the second joint short tube 2 and the hollow interior of the intermediate joint short tube portion 2a are shown in FIG. As shown in the figure, the hollow interior of the second joint short pipe 2 crosses the lower side of the hollow interior of the intermediate joint short pipe portion 2a in a cross shape. In addition,
Conversely, a structure in which the second joint short pipe 2 is connected to the upper half side of the intermediate joint short pipe section 2a in an orthogonal state may be adopted.

As shown in FIGS. 3 and 4, also in the second joint short pipe 2, as shown in FIGS. It is inserted. The second joint base 8 is provided with a small-diameter short cylindrical portion 8a of a fixed length which is slidably inserted in the second joint short tube 2 slidably in the longitudinal direction and rotatably in the circumferential direction, and the second joint short tube. 2 has a large-diameter short tubular portion 8b protruding from the open end of the second joint short pipe 2, and has an outer peripheral surface which is longer than an annular seal material 15 embedded in the inner peripheral surface of the open end of the second joint short pipe 2. Slidable in the direction and rotatably in the circumferential direction. And a female thread portion 8c for connecting the second pipe B by screwing a screw portion provided on the outer peripheral surface of the open end of the second pipe B to the inner peripheral face of the open end of the large diameter short cylindrical portion 8b is provided. The outer end of the small-diameter short tube portion 8a
A cross-shaped support piece 8d is provided integrally on the inner peripheral surface of the support piece 8a, and a second rod body 9 is provided at the center of the support piece 8d.
A screw hole 8e is formed by screwing a screw portion at one end.

Further, a second sealing plug 10 having an annular sealing material 16 mounted on its outer peripheral surface is provided at the other end opening of the second joint short pipe 2.
And the other end of the second rod body 9 is inserted through the center of the second sealing plug 10 and is integrally fixed by a nut 9a. The outer peripheral sealing material 16 of the second sealing plug 10 is slidably slidably contacting the inner peripheral surface of the opening of the second joint short pipe 2. 8 so as to slide in the length direction of the second joint short pipe 2 integrally. Also, a locking ridge 2c for retaining the second fitting base 8 is provided so as to protrude from the opening end on the other end side of the second joint short pipe 2 toward the inside thereof with an appropriate length dimension. I have. Therefore, the length of expansion and contraction in the length direction of the second joint base 8 with respect to the second joint short pipe 2 is determined by the position at which the inner end surface of the large-diameter short tube portion 8b abuts on the upper end surface of the second joint short pipe 2; That is, the second sealing plug 10
Is formed to have a length between the opening of the other end of the second joint short pipe 2 and the abutment of the locking ridge 2c.

In the first joint short pipe 1, the inner peripheral diameter of the sealing material 12 attached to the one end opening thereof and the first sealing plug 5
The outer diameter of the seal material 13 attached to the outer peripheral surface of the seal member 13 is formed to be the same diameter, and similarly, the inner peripheral diameter of the seal material 11 at one end opening of the intermediate joint short pipe portion and the intermediate seal plug 7 are attached. Seal material
14 has the same outer diameter as the outer diameter of the sealing material 15 at the one end opening of the second joint short pipe 2 and the outer diameter of the sealing material 16 attached to the second sealing plug 10. It is configured such that the fluid pressure passing therethrough acts on each sealing material at an equal pressure.

An example of the mode of use of the pipe connecting elbow constructed as described above will be described. The pipe connecting elbow is buried underground, and the second joint base 8 of the second short pipe 2 is grounded. While connecting the second pipe short pipe 2 laid horizontally in the inside, the first pipe A is connected to the first joint base 3 of the first joint short pipe 1.
Are connected to each other so as to protrude from the ground to the ground, and the protruding end is connected and communicated with a fire hydrant or a faucet. When water is supplied through the second pipe B in this state, the supplied water flows into and fills the second joint short pipe 2, and the other end opening of the second joint short pipe 2 is closed by the second sealing plug 10. Therefore, the flow is changed from the inside of the second joint short pipe 2 toward the inside of the intermediate joint short pipe portion 2a in a direction perpendicular to the direction of the flow, and the flow is changed.

At this time, the inner peripheral diameter of the sealing material 15 at one end opening of the second joint short pipe 2 and the sealing material attached to the second sealing plug 10
Since the outer peripheral diameter of the seal member 16 is the same as that of the seal member 15, the fluid pressure acting on these seal members 15 and 16 is equal and opposite in direction. Sealing plug
Since it is connected to the rod 10 by the rod body 9, the joint base 8 and the sealing plug 10 do not move in the length direction with respect to the second joint short pipe 2.

Further, the supply water flows through the intermediate joint short pipe portion 2a and flows vertically upward through the first joint short pipe 1 from inside the connection port tube portion 1a of the first joint short pipe 1, and the first pipe side It is sent to. Also at this time, in the intermediate joint short pipe portion 2a and the first joint short pipe 1, the fluid pressure acting on the seal members 11, 14, 12, and 13 provided at both ends thereof is equal pressure and the same. The direction is opposite, and the intermediate sealing plug 7 is integrally connected to the connection port tube portion 1a via the intermediate rod body 6 on the side of the intermediate joint short pipe 2a, and on the side of the first joint short pipe 1 Since the first first joint base 3 and the first sealing plug 5 are connected via the first rod body 4, the intermediate joint short pipe portion 2a and the first first joint base 3 slide and move. There is no danger.

In such a state, the first joint base 3 to which the first pipe A is connected is slidably inserted in one end opening of the first joint short pipe 1 in the longitudinal direction. The first pipe A and the first joint short pipe 1 can relatively expand and contract in the longitudinal direction (the direction indicated by the arrow X in FIG. 1). 2 can be absorbed by the above-mentioned expansion and contraction amount even if it changes in the up and down direction integrally.

Further, when the ground fluctuation in the left-right direction occurs with respect to the first pipe A, the intermediate joint short pipe portion of the second joint short pipe 2
The 2a and the connection port tube portion 1a of the first joint short pipe 1 slide relative to each other in the left-right direction, and expand and contract in the direction indicated by the arrow Y in FIG. 1 to absorb the fluctuation amount. Further, when ground fluctuation occurs in the length direction of the second joint short pipe 2 (the direction indicated by the arrow Z in FIG. 1), the second joint base 8 connecting the second pipe B and the second joint short pipe 2 relatively expands and contracts in the same direction to absorb the fluctuation amount.

Further, the first joint base 3 and the first joint short pipe 1 to which the first pipe A is connected are fitted to each other so as to be rotatable in the circumferential direction. The intermediate joint short pipe portion 2a connected in a direction perpendicular to the first pipe 1 is pivotable about the pipe axis of the first pipe A, so that the second joint short pipe 2 is rotatable in the horizontal direction on a horizontal plane, In addition, the intermediate joint short pipe section
2a and the connection port tube portion 1a of the first joint short pipe 1 are rotatably fitted to each other. The pipe B is rotatable vertically with respect to the first pipe A, and can absorb the amount of ground fluctuation in each direction.

In addition, the second short pipe 2 and the second pipe B
Are connected to the second joint base 8 to which the first joint short pipe 1 is rotatable in the circumferential direction, so that the first joint short pipe 1 is around the pipe axis of the second joint short pipe 2, that is, in the left-right direction. It is rotatable and can absorb ground fluctuations occurring in that direction. In the above embodiment, the supply water is circulated from the second pipe B side to the first pipe A side. However, the flow in the opposite direction is also possible, and the elbow of the present invention is underground. It goes without saying that the present invention can be applied not only to pipes but also to ground pipes in buildings and the like.

[0029]

As described above, according to the elbow for pipe connection of the present invention, the first pipe connected to the first joint short pipe side and the second pipe connected to the second joint short pipe side are vertically and horizontally. , And can be connected to be freely rotatable and displaceable in the front-rear direction, and can also be connected to be able to expand and contract in the respective length directions,
Therefore, even if the ground changes due to an earthquake or the like, such as when pipes are laid underground, the pipes freely displace and displace in the direction of the change, eliminating the concentration of stress and absorbing the amount of change in the ground without difficulty. It is possible to prevent the pipe from being deformed, broken or detached from the joint.

As described above, the pipe connecting elbow of the present invention has excellent seismic resistance, and the first fitting base for connecting the first pipe is provided with a sealing material at the other end opening of the first fitting short pipe. And the first sealing plug, which is slidably fitted via the first rod body, is connected via the first rod body, so that the joint base and the first sealing plug are integrated into the first joint short pipe. Can be slid, and the sealing portions at both ends of the first joint short pipe with respect to the fitting base and the first sealing plug have the same diameter. The working fluid pressure is always the same.Therefore, depending on the fluid pressure, the first pipe does not move in the length direction and the fitting base should always be located at that position unless external force such as vibration is applied. Can be.

Further, the second pipe connected to the second short pipe of the joint via the second fitting base also expands and contracts in the longitudinal direction similarly to the first pipe, and the fitting base is connected to the second rod. Since it is integrally connected to the second sealing plug via the body and these sealing portions are formed to have the same diameter, the second pipe moves in the length direction depending on the fluid pressure flowing inside. Similarly, also in the intermediate joint short pipe portion provided integrally with the second joint pipe, the inside of the connection port tube section on the first joint short pipe side and the other end of the intermediate joint short pipe section are also provided. The intermediate plug and the inserted intermediate plug are connected via an intermediate rod body, and the sealing portion of both is formed to have the same diameter. The fluid does not move, and the fluid can flow smoothly.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state where first and second pipes are connected,

FIG. 2 is a longitudinal front view thereof,

FIG. 3 is a cross-sectional view taken along a line II in FIG. 2;

FIG. 4 is a vertical sectional side view taken along the line II-II in FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 First joint short pipe 1a Connection port tube part 2 Second joint short pipe 2a Intermediate joint short pipe part 3 First joint base 4 First rod body 5 First sealing plug 6 Intermediate rod 7 Intermediate sealing plug 8 Base for second joint 9 Second rod body 10 Second sealing plug

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F16L 41/00-49/00 F16L 1/024 F16L 27/00-27/12

Claims (1)

(57) [Claims] A first joint short pipe having a connection port tube projecting from one side thereof and a second joint short pipe having an intermediate joint short pipe integrally provided in an orthogonal state; The first joint base of the first pipe is slidably and rotatably inserted in the length direction in the one end opening of the one joint short pipe, and the other end opening of the first joint short pipe is inserted. It is closed with a disc-shaped first sealing plug slidably fitted in the opening, and the first sealing plug and the first fitting base are connected by a first rod having a fixed length. On the other hand, the one end opening of the intermediate joint short pipe is slidably and rotatably fitted in the length direction in the connection mouth tube part of the first joint short pipe, and the intermediate joint short pipe is connected. While communicating with the inside of the first joint short pipe via the mouthpiece, the other end opening of the intermediate joint short pipe is closed with a disk-shaped intermediate sealing plug slidably inserted into the opening. The intermediate sealing plug and the central portion in the connection port cylinder are connected by an intermediate rod body having a fixed length, and the internal passage of the second joint short pipe is vertically moved with respect to the passage in the intermediate joint short pipe. The second joint base of the second pipe is slidably and rotatably inserted in the lengthwise direction at the one end opening of the second joint short pipe, and the other end is opened. The part is closed with a disk-shaped second sealing plug slidably inserted into the opening, and the second sealing plug and the second fitting base are fixed with a second rod body of a predetermined length. Elbow for pipe connection characterized by being connected.