JP3280841B2 - Pipe fittings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a pipe joint used for connecting pipes such as a drain pipe.

[0002]

2. Description of the Related Art In a high-rise building or the like, a drain pipe is piped through a pipe shaft provided along a wall surface. At this time, the pipes are connected at appropriate locations. For this connection, for example, a flange joint structure as shown in FIG. 3 is mainly used. That is, one of the tubes 21 is provided with a slightly large-diameter receiving port 22 at the pipe end, and
A fixed side flange 23 that expands radially outward is formed at the end of 22.

[0003] The other end of a pipe (hereinafter referred to as a connection pipe) 28 in which a movable flange 24, a lock ring 25, a collar 26, and a packing 27 are sequentially fitted is inserted into the socket 22. 29. An operation of fastening the movable flange 24 to the fixed flange 23 with the nut 30 is performed. As a result, the packing 27 is compressed in the axial direction, and the packing 27 strongly adheres to the outer peripheral surface of the connection pipe 28 and the inner surface of the receiving port 22. As a result, a connection state is obtained in which the withdrawal of the connection pipe 28 is prevented, and a sealing property (water stoppage) is provided.

[0004] As shown in FIG. 4, the flanges 23 and 24 are fastened to each other by bolts 29 and nuts 30 at a plurality of equally spaced positions in the circumferential direction. A uniform compressive force is applied.

[0005]

However, in the above-described flange joint structure, the pipes 21 to be connected to each other are not required.
Since the flanges 23 and 24, which are considerably larger in diameter than 28, are provided in the connection area, there is a problem that the entire pipe in the pipe shaft, for example, will not fit well.

Further, the movable side flange 24 is pushed and the packing is
When fastening the bolts 27 and nuts 30 at multiple locations to compress the shaft 27 in the axial direction, the working space for turning the tightening tool such as a spanner at each fastening location is limited by the radial direction of the flanges 23 and 24. More essential to the outside. Therefore, such a work space cannot be sufficiently secured in a narrow pipe shaft in many cases, and therefore, there is a problem that good workability cannot be obtained.

[0007] The present invention has been made in view of the above-mentioned conventional problems, and can reduce the required piping space, improve the workability, and furthermore, is a pipe joint suitable for drainage pipes and the like. It is intended to provide.

[0008]

In order to achieve the above object, a pipe joint according to a first aspect of the present invention is characterized in that a pipe end of a second pipe is inserted into a receiving port of a first pipe. 1. A pipe joint for connecting a second pipe to each other, wherein the seal is pressed into and deformed by an inserted second pipe into a receiving port and brought into a pressure contact with the outer peripheral surface of the second pipe. A seal member made of an annular elastomer having a portion is fitted, and a seal member is provided at a position closer to the opening end of the receiving port than the seal member so as to guide the inserted second pipe to a position substantially concentric with the seal member. A substantially cylindrical retaining member is disposed at a position coaxial with the sealing member and has play in the axial direction with the sealing member, and an engaging portion that engages with the receiving port in the axial direction with the retaining member. Is provided, and the retaining member is provided with a diameter on the outer periphery of a portion of the retaining member that protrudes from the receiving port. And wound tightening band winding is reduced in diameter operated so as to push inwardly toward, and, the retaining portion
At the outer end in the axial direction of the material, the inner diameter increases toward the outside
Characterized in that a flare portion is provided .

According to such a configuration, when the pipe end of the second pipe is sequentially inserted into the retaining member and the seal member in the receptacle, the seal portion comes into pressure contact with the outer peripheral surface of the second pipe. Sealability is provided. That is, the sealing property is provided only by inserting the second pipe into the sealing member without applying an axial compressive force to the sealing member. In addition, during the insertion operation of the second tube, the second tube is guided by the retaining member located coaxially with the seal member so that the concentricity of the second tube with the seal member is maintained. It is inserted and held by the seal member. Thereby, it is ensured that the pressure contact state of the seal member to the outer periphery of the second pipe becomes more uniform over the entire circumference, thereby maintaining good sealing performance.

After the end of the second pipe is inserted as described above, the operation of reducing the diameter of the tightening band wound on the outer peripheral surface of the retaining member is performed to thereby reduce the diameter of the retaining member. Push inward in the direction. As a result, the retaining member is pressed against the outer surface of the second tube, and as a result, a connection state is obtained in which the removal of the second tube from the receptacle is prevented. That is, in the above, it is not necessary to apply an axial compressive force to the seal member in the operation for setting the connection state in which the second tube is prevented from being pulled out. Therefore, the tightening band as described above is provided. The second tube can be fixed to the retaining member by reducing the diameter of the second tube.

Therefore, in this case, there is no need to provide a flange that protrudes largely outward in the radial direction, so that the entire shape can be formed more compactly. As a result, the piping space becomes smaller. The fitting state of the pipe in the pipe shaft and the like described above is improved, and the workability can be improved. On the other hand, the pipe joint according to claim 1 of the present invention is characterized in that a flare portion whose inner diameter becomes larger outward is provided at the axially outer end portion of the retaining member.

In this case, at the time of the initial operation of inserting the second tube into the retaining member, the flare portion allows the second tube to be inserted into the second tube.
Since the pipe end of the pipe is guided so as to be located concentrically with the retaining member, insertion becomes easy, and workability is further improved. The pipe joint according to claim 2 is characterized in that the retaining member is made of a synthetic resin material.

That is, for example, a metal pipe such as a cast iron pipe is used for a drain pipe or the like.
If the retaining member that is fastened to the tube in pressure contact is also made of metal, when the tube undergoes minute displacement such as length change due to vibration or temperature change, the relative sliding between the contact surfaces of the metal This causes abnormal noise. As a result, the resident feels suspicious or uncomfortable, resulting in impaired habitability and lacking the appropriateness as a drain pipe.

On the other hand, in the above, since the retaining member is made of a synthetic resin material, even if the second tube is a metal tube, the above-mentioned relative slipping on the contact surface causes the generation of abnormal noise. Be avoided. Thereby, it can be used as a pipe joint suitable for a drain pipe or the like. The pipe joint of claim 3 is
A pipe receiving portion is provided at the axially inner end of the seal member so that the end face of the second pipe inserted into the seal member abuts in a radially inwardly projecting shape.

That is, in this configuration, since the pipe end of the second pipe does not come into a connected state in which it is in direct contact with the first pipe or the inner surface of the receiving port, even if pipe vibration occurs in the drain pipe or the like, this is not possible. Vibration is absorbed by a sealing member made of an elastomer. This prevents noise due to the above-mentioned vibrations and furthermore the occurrence of corrosion.

[0016]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a state in which first and second two drain pipes 1 and 2 are coaxially connected via a pipe joint 3 in the present embodiment. These tubes 1.2
Is a cast iron pipe made of, for example, JIS standard FCD500, and a first pipe (hereinafter, referred to as a joint pipe) 1 is formed with a socket 4 as a joint body at the end of the pipe. The pipes (hereinafter, referred to as connection pipes) 2 are connected to each other while being inserted.

The above-mentioned socket 4 provided coaxially at the pipe end of the joint pipe 1 is formed in a cylindrical shape whose inner and outer diameters are slightly larger than that of the joint pipe 1 as shown in FIG. The joint pipe 1 is joined to the joint pipe 1 via a step wall 5 extending radially outward from the pipe end. Further, an inward flange 6 protruding radially inward is provided at an outer open end (upper end in the figure) of the receiving port 4.

A substantially cylindrical packing (seal member) is provided between the step wall 5 and the inward flange portion 6 in the receiving port 4.
A substantially cylindrical retaining ring (retaining member) 8 that penetrates the inward flange portion 6 is attached to the receiving port 4. The packing 7 is made of, for example, an elastomer such as ethylene propylene rubber or styrene butadiene rubber or chloroprene rubber, and has an outer diameter that is the same as or slightly larger than the inner diameter of the receiving port 4, and is axially inward (in the figure, An end surface of the lower side (hereinafter, also referred to as an insertion direction) is brought into contact with the step wall 5 and is adhered to the inner surface of the receptacle 4 with an adhesive.

At the inner surface of the packing 7, annular lips 7a projecting radially inward are provided at two positions in the axial direction.
Are provided as seal portions. These lips 7a ・ 7a
Are formed in a shape inclined in the insertion direction, and records 7b are formed on the surface thereof. Further, a tube receiving portion 7c is formed on the lower end side of the packing 7 which is in contact with the step wall 5 and projects slightly inward in the radial direction from the inner surface of the joint tube 1.

The retaining ring 8 is made of, for example, a synthetic resin material such as polypropylene or polyethylene, and is provided at a lower end of a cylindrical portion 8a passing through the inward flange 6 of the receiving port 4.
An engaging flange (engaging portion) 8b that extends radially outward is provided. The retaining ring 8 is fitted in the receiving port 4 with the engaging flange 8b interposed between the upper end surface of the packing 7 and the inward flange 6. On the other hand, the upper end side of the cylindrical portion 8a of the retaining ring 8 is formed as a flare portion 8c which extends obliquely outward in the radial direction.

Although not shown, the engaging flange 8b and the inward flange 6 are partially cut out in the circumferential direction. That is, the retaining ring 8 is positioned at a rotational angle position such that a portion of the engaging flange 8b outside the notch region overlaps the notch region of the inward flange portion 6 in the axial direction, and is inserted into the receiving port 4. And assembled. After this assembling, the retaining ring 8 is rotated by rotating the retaining ring 8 so that the outsides of the notched areas of the engaging flange 8b and the inward flange 6 overlap each other in the axial direction. 4 are engaged with each other in the axial direction and are prevented from being removed from the receiving port 4.

The inner diameter of the cylindrical portion 8a of the retaining ring 8 is formed slightly larger than the outer diameter of the connecting pipe 2 so that the connecting pipe 2 can be inserted from above.
The outer diameter is formed so as to have a loose fitting state in the inward flange portion 6, that is, a dimension in which there is a small fitting gap that can be relatively rotated in the inward flange portion 6. On the outer periphery of the cylindrical portion 8a of the retaining ring 8, an inward flange 6 and a flare portion are provided.
A band-like tightening band 9 is wound around a portion between the band and the band 8c. The fastening band 9 is made of a thin steel plate such as stainless steel, and has a fastening screw 10 attached to one end in the circumferential direction. The tightening screw 10 is provided with its rotation axis directed in the tangential direction of the cylindrical portion 8a. The tightening screw 10 is rotated using a rotary tool such as a driver, so that the tightening band 9 is rotated.
Is configured to expand and contract the winding diameter.

Next, an operation procedure for connecting the connecting pipe 2 to the joint pipe 1 via the pipe joint 3 having the above-described structure will be described. First, before inserting the connection pipe 2 into the retaining ring 8, a slurry seal lubricant is applied to the outer peripheral surface of the end of the connection pipe 2 and the inner surface of the packing 7. And
The connecting pipe 2 is inserted into the retaining ring 8. At this time, the flared portion 8c of the retaining ring 8 guides the pipe end of the connecting pipe 2 to a concentric position with the retaining ring 8 with insertion.

As shown in FIG. 1, insertion of the connecting pipe 2 as described above allows the retaining ring 8 to penetrate, and further the lips 7a of the packing 7 to penetrate sequentially, so that the pipe end is connected to the pipe receiving end. The operation is performed until it comes into contact with the part 7c. With the insertion operation at this time, each lip 7a, 7a is pushed in the insertion direction by abutting the pipe end of the connection pipe 2, and is bent and deformed along the outer peripheral surface of the connection pipe 2. Then, due to the elastic reaction force accompanying this deformation, each lip 7a, 7a having a record
The connection pipe 2 is pressed and held on the outer peripheral surface. That is, in the structure of the packing 7, the sealing performance can be obtained only by inserting the packing 7 into the packing 7 without applying an axial compressive force to the packing 7 after the connection pipe 2 is inserted.

In addition, at the time of the insertion operation of the connecting pipe 2, the connecting pipe 2 is guided by the retaining ring 8 so as to be located concentrically with the packing 7, and the concentricity is maintained after the insertion. It will be. Therefore, the insertion operation can be performed while causing each lip 7a, 7a to bend uniformly over the entire circumference. That is, when the tube is inserted in a state where the concentricity is not maintained, an irregular elastic reaction force is generated in the circumferential direction due to the irregular deformation of each lip 7a. Such an elastic reaction force tilts the insertion direction of the tube, and therefore, a force for maintaining the insertion direction of the tube is required against this, and the insertion operation becomes complicated.

However, in the above, a state in which the respective lips 7a are uniformly bent and deformed over the entire circumference is ensured by the guide by the retaining ring 8,
The operation is facilitated, and the insertion work of the connecting pipe 2 can be easily performed over the entirety thereof together with the guide at the initial stage of insertion by the flare portion 8c of the retaining ring 8 described above.

Further, even after the insertion of the connection pipe 2 is completed, the concentricity between the connection pipe 2 and the packing 7 is maintained by the retaining ring 8, so that each lip 7a is provided over the entire outer peripheral surface of the connection pipe 2. -A uniform pressure contact state of 7a is ensured, whereby good sealing properties are maintained thereafter. After the insertion of the connecting pipe 2 is completed as described above, the tightening screw 10 is rotated using a rotating tool such as a screwdriver to reduce the diameter of the tightening band 9, thereby connecting the connecting pipe 2 to the joint pipe 1. Ends.

By the operation of reducing the diameter of the tightening band 9, the retaining ring 8 is pushed radially inward so as to be in close contact with the outer peripheral surface of the connection pipe 2 over substantially the entire circumference, and further to the outer peripheral surface of the connection pipe 2. Is applied in the pressing direction. As a result, the relative movement between the retaining ring 8 and the connecting pipe 2 is prevented by the frictional force generated between them, and the retaining ring 8
Is fixed to the connecting pipe 2. As described above, the retaining ring 8 is prevented from being removed from the receiving port 4 by the axial engagement of the inward flange 6 of the receiving port 4 and the engaging flange 8b. By the above operation, the connection pipe 2 is connected to the receiving port 4
Is connected to the joint pipe 1 in an attachment state in which movement in the axial direction is restricted.

As described above, in the present embodiment, the packing 7 having a self-sealing effect that can obtain a sealing property only by inserting the connecting pipe 2 is fitted in the receiving port 4. After the connecting pipe 2 is inserted into the packing 7 through the retaining ring 8 having a guiding function to
By operating the tightening band 9, the connection pipe 2 is removed from the ring 8.
The connection pipe 2 is connected to the joint pipe 1 by being fixed to the joint pipe 1.

Therefore, in such a pipe joint 3, there is no need to provide a flange that protrudes largely outward in the radial direction, and the entire shape can be formed more compactly.
As a result, the piping space can be made smaller, so that the fitting state of the piping in the pipe shaft and the like described above is improved, and the workability is improved. In addition, since the connecting pipe 2 is fixed to the retaining ring 8 by the tightening band 9 wound around the outer circumference of the retaining ring 8, even if the diameter of the connecting pipe 2 varies, for example, the entire circumference of the pipe 2 is changed. , A substantially uniform tightening force can be exerted. As a result, the concentricity of the connection pipe 2 with respect to the retaining ring 8 is maintained, so that the packing 7 on the outer circumference of the connection pipe 2 also comes into a uniform pressure contact state over the entire circumference. Therefore, good sealing performance can be ensured even if the pipe diameter varies.

Further, the diameter of the retaining ring 8 as described above can be reduced by rotating the tightening screw 10 provided at one location in the circumferential direction. Therefore, as compared with the above-described configuration in which the bolt 29 and the nut 30 are required to be fastened at a plurality of locations in the conventional example, the work is further facilitated and the required work space can be reduced.

On the other hand, since the retaining ring 8 is made of a synthetic resin material, a minute displacement such as a length change due to vibration or temperature change due to drainage occurs in the connecting pipe 2, and the connecting ring 2 is not connected to the retaining ring 8. Even if relative sliding occurs at the contact surface, no abnormal noise is generated. Furthermore, the packing 7 is provided with a pipe receiving portion 7c at the end in the insertion direction where the tip of the connecting pipe 2 abuts, whereby the end of the connecting pipe 2 is also connected to the joint pipe 1 and the receiving port 4. Direct contact is prevented. Accordingly, since there is no metal touch portion over the whole, the above-described soundproofing property and corrosion prevention property are also improved, so that it is further suitable as a pipe joint of a drain pipe.

The packing 7 is provided with lips 7a, 7a which are bent and deformed on the inner surface. The lips 7a and 7a have a structure which can generate a relatively large elastic deformation when the connecting pipe 2 is inserted. Therefore, the elastic reaction force caused by the deformation at the time of insertion of the connection pipe 2 does not suddenly increase.
Insertion becomes easy, and good workability can be obtained. In addition to being able to respond to variations in pipe diameter,
Good sealing performance can be exhibited even on the casting surface of the connection pipe 2 made of a cast iron pipe.

When the connecting pipe 2 is inserted, a sealing lubricant is applied to the surface thereof. This reduces insertion resistance, thereby improving workability. Also, since this seal lubricant will also fill the unevenness of the casting surface,
The sealability is also improved by this lubricant. On the other hand, in the above, an adhesive is applied over the entire outer peripheral surface of the packing 7 and the packing 7 is adhered and fixed to the inner surface of the receiving port 4, and the adhesive layer forms a gap between the packing 7 and the receiving port 4. Leakage through is more reliably prevented. In addition, socket 4
Even if there is uneven coating on the inner surface, the unevenness is filled with the above-mentioned adhesive layer, so that the sealing property between the packing 7 and the inner surface of the receiving port 4 is further ensured.

Further, since the retaining ring 8 is mounted so as to be rotatable relative to the receptacle 4, the working direction at the time of tightening the tightening band 9 can be freely set, thereby also improving workability. improves. In addition, as for this retaining ring 8, when the connecting pipe 2 is long,
In anticipation of the amount of expansion and contraction due to the temperature change, the retaining ring 8 can be displaced integrally with the connecting pipe 2 in the axial direction.
It is also possible to provide a predetermined play between the engagement flange 8b and the inward flange 6 and the packing 7 facing the engagement flange 8b.

Further, in the above-described embodiment, an example is described in which the pipe joint of the present invention is applied to a drain pipe, but the present invention can be applied to connection of any other pipe.

[0037]

As described above, according to the first aspect of the present invention,
In the pipe joint of (1), a seal member having a sealing property only by inserting the second tube is fitted into the socket of the first tube, and the second tube is concentric with the seal member during the insertion operation. In order to maintain the property, a retaining member having a function of guiding the second tube is provided, so that the sealing member is pressed more uniformly over the entire circumference of the second tube, whereby Good sealability is maintained.

Then, the operation of reducing the diameter of the tightening band wound on the outer peripheral surface of the retaining member can be brought into a connected state in which the removal of the second tube is prevented. Therefore, since it is not necessary to provide a flange that protrudes greatly, the entire shape can be formed more compactly. As a result, the required piping space can be made smaller, so that the piping can be properly accommodated in the above-described pipe shaft and the like, and the workability can be improved.

Further, in the pipe joint according to the first aspect , the flare portion provided at the outer opening end of the retaining member allows the initial operation of inserting the second pipe into the retaining member during the initial operation.
Since the pipe end of the second pipe is guided so as to be located concentrically with the retaining member, the workability is further improved. In the pipe joint according to claim 2, even when the pipe fitting is applied to a drain pipe formed using a metal pipe such as a cast iron pipe, since the retaining member is made of a synthetic resin material, vibration or temperature change occurs in the pipe. Even if a minute displacement such as a change in length occurs due to the above, generation of abnormal noise due to relative sliding between the second pipe and the retaining member is prevented. As a result, the resident or the like does not feel suspicious or uncomfortable, and can be used as a pipe joint suitable for a drain pipe or the like.

In the pipe joint according to the third aspect , the insertion end of the second pipe is also in a connected state in contact with the pipe receiving portion of the sealing member. Is absorbed by the sealing member. As a result, it is possible to prevent noise and corrosion from being caused by the vibration.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing a connected state of pipes by a pipe joint according to an embodiment of the present invention.

FIG. 2 is a partially cutaway front view showing an end configuration of a pipe on a receiving side of the pipe joint.

FIG. 3 is a cross-sectional view showing a connected state of pipes by a conventional pipe joint.

FIG. 4 is a view taken in the direction of the arrow UU in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Joint pipe (1st pipe) 2 Connection pipe (2nd pipe) 3 Pipe joint 4 Reception port 7 Packing (seal member) 7a Lip (seal part) 7c Pipe receiving part 8 Retaining ring (retaining member) 8b Engagement collar (engagement part) 8c Flare part 9 Tightening band

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tomoaki Oda 516 Kamino, Sakai City, Osaka Prefecture Tokawa Rubber Co., Ltd. (72) Inventor Go Ataka 7-1-22-2 Minamienkajima, Taisho-ku, Osaka City, Osaka Stock (72) Inventor Yoshimichi Ogino 7-1-2 Minamionkajima, Taisho-ku, Osaka City, Osaka Prefecture, Japan Kubota Onkajima Plant (56) References JP-A-7-127773 (JP, A JP-A-63-23082 (JP, A) JP-A-61-24649 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16L 19/03

Claims (3)

(57) [Claims] 1. A pipe joint for inserting a pipe end of a second pipe into a socket of a first pipe to connect the first and second pipes to each other. A seal member made of an annular elastomer having a seal portion that is pressed and deformed by the second pipe and is pressed into contact with the outer peripheral surface of the second pipe is fitted to the outer peripheral surface of the second pipe. the end side, to a position on the seal member coaxially to guide substantially concentric position relative to the second tubular sealing member inserted, and, Yu the sealing member and the axial direction
A retaining member having a substantially cylindrical shape is provided, and the retaining member is provided with an engaging portion that engages with the receiving port in the axial direction, and protrudes from the receiving port of the retaining member. A tightening band that is operated to reduce the diameter of the retaining member so as to push the retaining member radially inward is wound around the outer periphery of the portion .
And an axially outer end portion of the retaining member.
The flare part where the inside diameter becomes larger as the outside diameter becomes
Pipe joint, characterized by that. 2. The method according to claim 1, wherein the retaining member is made of a synthetic resin material.
The pipe joint according to claim 1, wherein: 3. An axially inner end of the seal member
Pipe end contacting the end face of the second pipe inserted into the seal member
That the damping part is provided in a radially inwardly projecting shape.
The pipe joint according to claim 1 or 2, wherein