JPH11218273A - Pipe joint structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a pipe joint structure in such a way that its connecting operations are surely and quickly performed, and equally distribute works required by connection around the pipe joint structure. SOLUTION: A male side pipe 3 in a straight pipe shape is inserted in a female side pipe 1 having a socket 2, and concurrently, a sealing member 5 is inserted in a space between both of the pipes 1 and 3. The socket 2 is provided with a tapered part 8 expanded in a horn shape, and the sealing member 5 is provided with an upheaved swelling part 5a abutting against the opening circumferential part of the socket 2. And an area around the tapered part 8 is fastened by a ring member 6 having both a diameter contracting fastening part 13 and a recessed part at one place in the circumferential direction. Since the aforesaid ring member 6 is drawn up to the tapered part 8 by a diameter contracting action, the upheaved swelling part 5a of the sealing member 5 is intensively compressed in the axial direction, and an expansion action in the radial inward and outward directions in caused thereby a connecting work and a sealing work can thereby obtained around the pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint structure.

[0002]

2. Description of the Related Art In a high-rise building, when a main pipe for drainage is piped through each floor or when a horizontal pipe connected to the main pipe is piped, straight pipes of a predetermined length are connected to each other. It is necessary to connect a straight pipe and a bent pipe. For this connection, a mechanical joint structure as shown in FIGS. 9 and 10 is generally employed.

In this mechanical joint structure, a receiving end 31 having a slightly larger diameter is provided at a pipe end of one pipe 30. A flange 32 is integrally formed on the outer peripheral portion of the opening end of the receiving port 31 so as to protrude. On the other hand, the other end of the tube 34 has a straight tubular shape so that it can be inserted into the socket 31. And
A press ring 35, a lock ring 36, a collar 37, a packing 38, and the like corresponding to the flange 32 are externally fitted to the pipe end in this order, and then the pipe end of the pipe 34 is connected to the socket. Insert into 31. Then, the flange 32 and the pressing ring 35 are connected using the bolt 40 and the nut 41.

Accordingly, the packing 38 is compressed in the axial direction of the tube, and the packing 38 strongly adheres to the inner surface of the receiving port 31 and the outer peripheral surface of the end of the tube 34 on the insertion side.
34 are connected in a watertight manner. The number and arrangement of the bolts 40 and the nuts 41 to be fastened vary depending on the size of the tubes 30 and 34, but are arranged at two to six positions in the circumferential direction around the tubes.

[0005]

In the conventional mechanical joint structure, since there are a plurality of fastening positions of the bolt 40 and the nut 41, the fastening operation is troublesome, and some of them are difficult for the operator. There is a drawback that the pipes 30 and 34 are shaded (that is, on the back side) and the fastening operation becomes difficult. In addition, with such a plurality of fastening positions, there is a possibility of causing local overtightening,
Also, it has been difficult to make the fastening torque at each point constant.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a pipe joint structure capable of easily and quickly connecting pipes and making the connection state around the pipe uniform. With the goal.

[0007]

According to the present invention, the following technical measures have been taken in order to achieve the above object. That is, in the pipe joint structure according to the present invention, a ring-shaped seal member is mounted between both the pipe having the receiving port and the pipe inserted into the receiving port of the pipe. Further, a tightening ring is provided which can be fitted around the socket. The tightening ring has a dividing portion at a predetermined position in a circumferential direction thereof, a tightening portion capable of reducing the dividing portion, and a concave portion which is opened on the inner peripheral side in at least one position in the circumferential direction. Is provided.

[0008] A tapered outer surface is provided around the opening end of the receiving port so that the diameter increases toward the outside in the tube axis direction. On the other hand, when the tightening portion is operated to reduce the dividing portion, the tightening ring contacts the tapered outer surface of the receiving port and moves toward the small diameter side along the pipe axis direction. There is provided an axial movement guide surface for guiding, and a seal pressing surface for pushing the seal member inward of the receiving port during this movement.

Therefore, the sealing member pushed inwardly of the receiving port in this way is compressed in the tube axis direction and at the same time expands radially inward and outward. Therefore, this seal member comes into close contact with the inner peripheral surface of the opening of the receiving port and the outer peripheral surface of the pipe end at the insertion side. With such a configuration, the operation of connecting the pipes only requires operating one fastening portion of the fastening ring. Also,
Since the tightening ring is rotatable around the receiving port before the operation of the tightening portion, the position of the tightening portion can be arbitrarily changed to a position convenient for the operator.

[0010] Thus, the connecting operation can be performed extremely quickly and easily. In addition, since the tightening ring is provided with a concave portion that opens on the inner peripheral side at least at one location in the circumferential direction, the diameter can be easily and smoothly reduced or expanded when the tightening portion is operated. Therefore, the familiarity of the tightening ring with respect to the periphery of the receiving port, the seal member (or the pressing ring), and the like can be improved, which leads to an advantage that reliable tightening can be performed.

In the meantime, a large-diameter portion capable of forming a circumferential space between the receiving port and the outer peripheral surface of the insertion-side pipe end is provided on the inner side of the pipe with respect to the mounting portion of the sealing member. The member can be formed with an extended cylindrical portion that can be inserted into the large diameter portion. In this way, at the time of shipment of the pipe, the seal member is attached in advance to the inner peripheral face of the receptacle having the receptacle or the outer peripheral face of the pipe end to be inserted into the receptacle. Will be able to In addition, naturally, the sealing property of the sealing member can be improved.

In this case, it is preferable to form an inner flange portion projecting from the extension end of the tubular portion of the seal member so as to be able to contact the end surface of the insertion tube end. . By doing so, the rust prevention effect of the pipe end can be enhanced. Operate the tightening part with the tightening ring,
If the dividing part is reduced, the tightening ring naturally decreases in diameter,
Therefore, a moving force in the circumferential direction (circumferential strain) is generated on the inner peripheral surface of the ring.

In this case, if a pressing ring is previously inserted into the insertion-side tube end and this pressing ring is positioned between the seal pressing surface of the tightening ring and the seal member, the seal of the tightening ring can be reduced. Appropriate sliding in the circumferential direction occurs between the contact between the pressing surface and the pressing wheel. That is, the circumferential strain generated when the diameter of the tightening ring is reduced is not directly transmitted to the seal member. Therefore, an axial pressing force is applied to the seal member uniformly over the entire circumference and in the circumferential direction by the pressing wheel. Therefore, a reliable sealing action can be obtained, and the durability as a sealing member is improved.

This also has the advantage that the clamping ring can be of simple construction.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show a first embodiment of the pipe joint structure according to the present invention. As apparent from FIG. 1 showing the connected state and FIG. 2 showing the disassembled state of each component before being connected, the pipe joint structure is different from the socket 2 provided on one pipe 1 with the other pipe 3. The tube end 3a is inserted and connected, and in addition to the two tubes 1 and 3, a seal member 5 having a substantially cylindrical shape as a whole and a tightening ring 6 are provided.

In the following, for convenience of explanation, the tube 1 having the socket 2 is referred to as a "female tube" and the other tube 3 is referred to as a "male tube".
I will say. The receiving port 2 of the female tube 1 has a large diameter portion 7 and a tapered portion 8. The tapered portion 8 is provided around the tube end of the female side tube 1, that is, around the opening end as the receiving port 2. The inclination of the direction in which the outside diameter becomes larger as it goes is attached. Therefore, a tapered outer surface 8a is formed on the outer peripheral surface side of the tapered portion 8, while a tapered inner surface 8b is formed on the inner peripheral surface side.

The diameter of the large diameter portion 7 is defined by the inner diameter of the main body portion of the female side tube 1 (the outer diameter of this portion is equal to the outer diameter of the male side tube 3). (Same as the diameter). Therefore, when the tube end 3 a of the male tube 3 is inserted into the large diameter portion 7, a peripheral space is formed between the outer peripheral surface of the tube end 3 a and the inner peripheral surface of the large diameter portion 7. Become so.

The sealing member 5 has a ring-shaped main part 5a, a cylindrical part 5b extending in the tube axis direction with respect to the main part 5a, and a radial end extending from the cylindrical part 5b. And an inner flange portion 5c provided to protrude inward. The sealing member 5 can be inserted into the receiving port 2 of the female tube 1 so as to cover the entire length of the large diameter portion 7 and the tapered portion 8. Also, in this inserted state,
The tube end 3a of the male tube 3 can be inserted into the seal member 5.

The main body 5a of the seal member 5 is
In order to be able to abut both the tapered inner surface 8b at the receiving port 2 and the outer peripheral surface at the tube end 3a of the male-side tube 3, it is formed into a round cross-section which is bulged radially outward and inward. Have been. The cylindrical portion 5b of the sealing member 5 is
The inner and outer diameters are determined so that the inner diameter of the large diameter portion 7 and the outer peripheral surface of the tube end 3a of the male side tube 3 can be in contact with either of them. In the present embodiment, the outer peripheral surface of the cylindrical portion 5b comes into contact with the inner peripheral surface of the large diameter portion 7.

The inner flange 5c of the seal member 5 is sandwiched between the deep step 7a of the large diameter portion 7 in the receptacle 2 of the female tube 1 and the end face of the male tube 3 at the end 3a. The inner peripheral surface is formed so as to be flush with the inner peripheral surfaces of both tubes 1 and 3. The tightening ring 6 is a literal ring body made of stainless steel or the like, and as shown in FIG.
2 is provided, and the fastening portion 1
3 are configured.

The tightening portion 13 includes a pair of fastening pieces 15 projecting radially outward of the ring from both side portions of the dividing portion 12.
And a screw receiving portion 16 formed by welding a nut member to one of the fastening pieces 15 or directly forming a screw hole, and a bolt member 17 penetrating the other fastening piece 15. Have. That is, the bolt member 17
When the screw is screwed into the screw receiving portion 16, the width of the dividing portion 12 can be reduced. On the contrary, if the bolt member 17 is loosened, the width of the dividing portion 12 is increased. Can be done. When the dividing portion 12 is expanded in this manner, the diameter of the tightening ring 6 is increased. As a result, the tightening ring 6 can be externally fitted to the tapered portion 8 of the receiving port 2 of the female tube 1.

The cross-sectional shape of the ring portion of the tightening ring 6 has a rounded mountain shape. The inner surface of the section of the female side tube 1 that is inclined corresponding to the tapered portion 8 of the receiving port 2 is
An axial movement guide surface 20 is provided. An inner surface of a portion of the shaft movement guide surface 20 that projects radially inward from a radially outer end is a seal pressing surface 21.

The tightening ring 6 is connected to the receiving port 2 of the female tube 1.
When the dividing portion 12 is reduced by the tightening portion 13, the shaft moving guide surface 20 is in contact with the tapered outer surface 8a of the tapered portion 8, and the pipe shaft is The movement to the small diameter side (left side in FIG. 4) is guided along the direction. That is, the tightening ring 6
While being reduced in diameter, it is drawn around the tapered portion 8 and becomes immobile.

At this time, the seal pressing surface 21 comes into contact with the end (the right side surface in FIG. 4) of the main body portion 5 a of the seal member 5, and the taper portion 8, that is, the inside of the female side tube 1. I will push it towards you. Therefore, the main body portion 5a of the seal member 5 is compressed along the pipe axis direction and expands radially inward and outward, so that the seal member 5 is tapered on the inner surface 8b of the tapered portion 8, that is, ,
The inner peripheral surface of the opening of the receiving port 2 and the pipe end 3a of the male side pipe 3
, Respectively. Thereby, an operation for connecting the two tubes 1 and 3 to each other and a sealing operation between the both tubes 1 and 3 can be obtained.

In the pipe joint structure, a sealing member 5 is fitted into the receiving port 2 of the female side pipe 1 and preferably adhered thereto, and a tightening ring 6 is provided around the outer circumference of the receiving port 2. It is good to make it factory-shipped in a state where it is fitted outside in a loose fit. By doing so, at the piping site, it is sufficient to perform only the work of inserting the male side pipe 3 into the female side pipe 1 and operating the tightening portion 13 of the tightening ring 6, thereby improving workability. It will be good. Further, since there is no need to manage and handle individual parts for the seal member 5 and the tightening ring 6, there is an advantage that misalignment of sizes and forgetting to prepare at a piping site can be prevented.

FIGS. 5 to 8 show a second embodiment of the pipe joint structure according to the present invention. The main difference between the second embodiment and the first embodiment is that, first, a press ring 23 is interposed between a seal pressing surface 21 of a tightening ring 6 and a seal member 5. Second, a recess 25 is provided at an appropriate position on the inner peripheral side of the tightening ring 6.

In addition, there are some differences in dimensions and shapes of the periphery of the receiving port 2 of the female side tube 1 and the body portion 5a of the sealing member 5. The pressing ring 23 is inserted into the tube end 3a of the male side tube 3 so as not to cause excessive rattling, and has a ring shape which is movable in the axial direction and the circumferential direction. The outer diameter of the pressing ring 23 is formed to be substantially the same as the outer diameter of the receiving port 2 in the female tube 1.

The pressing ring 23 has a fitting recess 23a for fitting the main body portion 5a of the sealing member 5 on an end face facing the female side pipe 1, and an outer peripheral portion of the opposite end face has a fitting recess 23a. A tapered surface 23b which is a slope opposite to the tapered portion 8 provided in the receiving port 2 of the female side tube 1 is provided. In addition, the main body part 5 of the seal member 5 shown in the second embodiment
Since a has an end face that is steep in the radial direction, the fitting concave portion 23a of the pressing ring 23 is also formed such that the concave surface is flat in the radial direction.

Further, the tightening ring 6 shown in the second embodiment has an angular "8" shape having a U-shaped divergent shape in cross section, and the shaft moving guide surface 20 also has a seal pressing force. Since the surface 21 is also a surface having a straight cross section, the tapered surface 23b of the press ring 23 is also formed as having a surface having a straight cross section. Since such a structure is provided with the pressing ring 23, when the tightening portion 13 is operated on the tightening ring 6 to reduce the dividing portion 12, the seal pressing surface 21 of the tightening ring 6 and the tapered surface 23b of the pressing ring 23 Between them, a moderate sliding in the circumferential direction occurs.

That is, when the diameter of the tightening ring 6 is reduced, the distortion in the circumferential direction is not directly transmitted to the seal member 5, and the seal member 5 is uniformly and circumferentially uniform by the pressing ring 23. , An axial pressing force is applied. On the other hand, in the tightening ring 6, the concave portion 25 is formed at at least one circumferential position of the tightening ring 6 (in the illustrated example, two of three equally distributed positions including the cut portion 12). Apart from this, the shaft moving guide surface 20 and the seal pressing surface 21 are cut out to form an opening on the inner peripheral side.

Since the recess 25 is provided, when the tightening portion 13 is operated to reduce or expand the dividing portion 12, the diameter of the tightening ring 6 can be reduced and expanded easily and smoothly. It is something to be done. Therefore, the fitting of the tightening ring 6 to the periphery of the receiving port 2 of the female side tube 1 and the seal member 5 (or the press ring 23) can be improved, which leads to an advantage that a reliable tightening can be performed.

In the fastening portion 13 of the fastening ring 6 shown in the second embodiment, a bolt provided on the fastening piece 15 as shown in FIG. The insertion portion 15a is formed as an elongated notch. In addition, in order to prevent the bolt member 17 and the screw receiving portion 16 from being easily detached from the fastening piece 15 by slightly loosening the bolt member 17 and the screw receiving portion 16 with this measure, the bolt portion 17 and the screw receiving portion 16 are bolted to the tip end of one of the fastening pieces 15. A bent portion 26 that can be engaged with the member 17 (or the screw receiving portion 16) is provided.

The bent portion 26 not only reinforces the fastening piece 15 but also becomes useful as a detent for the bolt member 17 (or the screw receiving portion 16) when the fastening portion 13 is operated. I have. Incidentally, the present invention is not limited to the above embodiment. For example,
The seal member 5 may be adhered to the tube end 3a of the male tube 3. Of course, it may not be bonded to any of the tubes 1 and 3.

In the seal member 5, the cylindrical portion 5b and the inner flange portion 5c are not essential. Therefore, if the sealing member 5 does not include the cylindrical portion 5b,
In the receiving port 2 of the female tube 1, it is not necessary to provide the large diameter portion 7. In the tightening ring 6, the structure of the tightening portion 13 can be appropriately changed. For example, the screw receiving portion 16 may have a structure in which a nut is simply screwed to the bolt member 17.

The recess 25 provided in the tightening ring 6 may be formed by cutting out only one of the shaft moving guide surface 20 and the seal pressing surface 21.

[0036]

As is apparent from the above description, in the pipe joint structure according to the present invention, when the pipe end of the other pipe is inserted into the socket of one pipe, a sealing member is inserted between the two pipes. Attachment is performed, and a fastening ring is fitted around the receiving port so that one fastening portion provided on the fastening ring is operated.

In other words, it is only necessary to operate one tightening portion for the connecting operation, and since this tightening ring is rotatable around the receiving port, the position of the tightening portion can be adjusted to a position convenient for the operator. Can be changed arbitrarily. Therefore, the pipes can be connected easily and quickly. In addition, since there is only one fastening position, local overtightening does not occur around the pipe, and there is an advantage that a uniform connection state can be achieved over the entire circumference. Further, since the diameter reduction limit of the tightening ring is naturally limited, there is an advantage that various problems due to excessive tightening can be prevented.

Further, since a concave portion is provided at an appropriate position in the circumferential direction of the tightening ring, the diameter of the tightening ring can be reduced and expanded more easily, and the tightening ring around the receiving port and a seal member (or press ring) can be formed. Can be used well and can be securely tightened. On the other hand, if a large-diameter portion is provided in the receiving port and a cylindrical portion and an inner flange portion are provided in the sealing member, the factory can be shipped with the sealing member attached to one of the pipes, and the workability is improved. In addition to being excellent in handleability, the sealability of the seal member can be enhanced.
In addition, it also leads to enhancing the rust prevention effect of the pipe end.

When the pressing ring is inserted through the end of the insertion-side tube, it is possible to prevent circumferential distortion generated when the diameter of the tightening ring is reduced from being transmitted to the sealing member. There is an advantage that the target is uniform in the circumferential direction and the sealing property is enhanced. Further, there is an advantage that the durability of the sealing member is also improved. This also has the advantage that the clamping ring can be of simple construction.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a first embodiment of a pipe joint structure according to the present invention.

FIG. 2 is an exploded side sectional view corresponding to FIG.

FIG. 3 is a front view of a tightening ring used in the first embodiment.

FIG. 4 is an explanatory view showing a movement when a tightening portion of a tightening ring is operated in the first embodiment.

FIG. 5 is a side sectional view showing a second embodiment of the pipe joint structure according to the present invention.

FIG. 6 is a front view of a tightening ring used in the second embodiment.

FIG. 7 is an enlarged view of a part of FIG. 6 (a fastening piece of a fastening portion).

FIG. 8 is a right side view corresponding to FIG. 7;

FIG. 9 is a side sectional view showing an example of a conventional pipe joint structure.

FIG. 10 is a view taken along the line AA of FIG. 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 One pipe (female side pipe) 2 Reception port 3 The other pipe (male side pipe) 3a Pipe end part 5 Sealing member 5a Body part 5b Cylindrical part 5c Inner flange part 6 Tightening ring 7 Large diameter part 8a Tapered outer surface 12 Dividing part 13 Tightening part 20 Shaft movement guide surface 21 Seal pressing surface 23 Press ring 25 Depressed

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Masao Nakaishi, Inventor 7--22 Minamienkajima, Taisho-ku, Osaka City, Osaka Prefecture Inside Kubota Enkajima Plant Co., Ltd. Chome 6-75 (72) Inventor: Tetsumochi Miyano, Chiba Prefecture, Chichi Prefecture

Claims (3)

[Claims] 1. A pipe joint structure in which a pipe end (3a) of the other pipe (3) is inserted into and connected to a receptacle (2) of one pipe (1). A ring-shaped seal member (5) that can be mounted between the peripheral surface and the outer peripheral surface of the insertion-side tube end (3a).
A dividing portion (12) which can be fitted around the receiving port (2) and is provided at a predetermined position in one circumferential direction; and the dividing portion (12).
A tightening ring (6) provided with a tightening portion (13) capable of reducing the diameter of the hole and a concave portion (25) opening at the inner circumferential side in at least one position in the circumferential direction. 2), a tapered outer surface (8a) is formed around the opening end so as to increase in diameter toward the outside in the tube axis direction. The tightening ring (6) is divided by a tightening portion (13). Receiving port (2) along the pipe axis direction when part (12) is reduced
A shaft moving guide surface (20) for guiding the movement of the tapered outer surface (8a) to the smaller diameter side, and a seal pressing surface (21) for pushing the seal member (5) into the receiving port (2) during this movement. And a pipe joint structure. 2. The receiving member (2) has a sealing member (5).
A large-diameter portion (7) capable of forming a circumferential space between the outer peripheral surface of the insertion-side tube end (3a) and the inner side of the tube with respect to the mounting portion is provided. The cylindrical portion (5b) that can be inserted into the large-diameter portion (7) is formed so as to be extended, and the extended end of the cylindrical portion (5b) is an end surface of the insertion-side pipe end (3a). Inner collar (5)
The pipe joint structure according to claim 1, wherein c) is formed. 3. A pressing wheel (23) is inserted through the insertion-side tube end (3a) in a state positioned between a seal pressing surface (21) of a tightening ring (6) and a sealing member (5). The pipe joint structure according to claim 1 or 2, wherein: