JP2006250276A - Packing for connection of horizontal branch pipe in drain pipe fitting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packing for a drain pipe fitting capable of enhancing the execution of works owing to a small resistance at the time of insertion while a good sealing performance of ring-shaped tabs is secured. <P>SOLUTION: A pillow part 7 having a large thickness is provided on the inside surface of the root part of the packing 1, and a horizontal branch pipe connected is supported from below by the pillow part 7, and thereby the horizontal branch pipe is held in a position concentrical to the ring-shaped tabs 4-6. Accordingly the tabs 4-6 are put in pressure contact with the horizontal branch pipe uniformly at all times, which allows the tabs 4-6 to have a large inside diameter without degrading the sealing performance, and thereby the pipe inserting resistance can be lessened. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a packing for connecting a lateral branch pipe used when connecting a lateral branch pipe to a drain pipe joint.

This type of packing is described in Patent Document 1, for example.
The packing 50 has a substantially cylindrical shape as shown in FIGS. 9 to 11, which is incorporated from the publication, and has an inner peripheral side of the side branch pipe connecting pipe portion 51 of the drainage pipe joint and an outer circumference of the side branch pipe 52. The side branch pipe 52 can be connected with one touch according to this packing 50, so that the water tightness between the two can be secured. As a result, the number of parts could be reduced, and the connection workability could be greatly improved.

Japanese Utility Model Publication No. 55-5833

However, the conventional one-touch packing 50 has the following problems.
That is, conventionally, the amount of insertion of the side branch pipe 52 is regulated by abutting the end portion of the side branch pipe 52 with a pipe stopper 51 a provided to project to the inner peripheral side of the side branch pipe connection pipe part 51. Due to the configuration, it causes abnormal noise, and the drainage pipe is formed by extending the side branch pipe due to the passage of heat drainage or the rise of outside air temperature, and the end thereof is pressed against the pipe stopper. Troubles such as cracks in joints occurred.

  Further, an annular tongue piece 50 a is provided on the inner peripheral side of the packing 50, and the annular tongue piece 50 a is elastically pressed against the outer peripheral surface of the horizontal branch pipe 52, so Since the watertightness is ensured, the inner diameter of the annular tongue piece 50 a is set to about 70% of the outer diameter of the lateral branch pipe 52. For this reason, when connecting the side branch pipe 52 to the side branch pipe connecting pipe portion 51 (inserting the side branch pipe 52 into the inner peripheral side of the packing 50), a dedicated lubricant is applied to the annular tongue piece 50a, etc. In addition, it is necessary to press-fit the side branch pipe 52 into the side branch pipe connecting pipe portion 51 of the drain pipe joint while elastically deforming the annular tongue piece 50a.

  Further, in the connected state of the lateral branch pipe 52, the packing 50 is subjected to a downward biased load due to the weight of the lateral branch pipe 52. Therefore, the annular tongue piece 50a is uniformly applied to the lateral branch pipe 52. It was not elastically welded, and it was difficult to ensure water tightness with the deterioration of the packing 50 over time, which caused water leakage.

  The present invention has been made to solve the problems of the conventional one-touch packing 50, and has as its first object to prevent troubles such as generation of abnormal noise due to expansion of the side branch pipe or cracking of the drainage pipe joint. In addition, when connecting, that is, when inserting the side branch pipe 52, the side branch pipe 52 can be inserted into the inner peripheral side of the packing without applying a special lubricant to the annular tongue piece. The second object is to improve the aging and suppress the aging deterioration of the packing.

The above-described problems are solved by the inventions of the claims.
In order to achieve the first object, the invention of claim 1 is mainly composed of a substantially cylindrical main body closely attached to the inner peripheral side of the side branch pipe connecting pipe part of the drainage pipe joint, and the insertion of the main body part A stopper edge for restricting the insertion amount of the lateral branch pipe inserted into the inner peripheral side of the main body portion is provided on the upper portion of the end portion on the distal end side so as to protrude toward the inner peripheral side.

  In order to achieve the second object, the present invention mainly comprises a substantially cylindrical main body closely attached to the inner peripheral side of the lateral branch pipe connecting pipe portion of the drainage pipe joint, and the inner peripheral side of the main body portion. An annular tongue piece that is elastically pressed against the outer periphery of the lateral branch pipe is provided, and the lateral branch pipe is disposed below the inner circumference of the annular tongue piece at the lower end of the main body portion on the near side of the insertion. And a cone portion for supporting the annular tongue piece in a state of being uniformly pressed against the lateral branch pipe.

  According to the above configuration, the amount of insertion of the side branch pipe is regulated by the stopper edge provided integrally with the packing, so there is no need to provide a pipe stopper on the drainage pipe joint side as in the prior art. The stopper can be eliminated. This eliminates the problem of abnormal noise that occurs when the end of the horizontal branch pipe collides with the pipe stopper, and also allows the drain pipe joint of the drain pipe joint to be expanded and pressed against the pipe stopper. Troubles such as cracks are eliminated.

Further, the lateral branch pipe is supported concentrically with the annular tongue piece of the packing by the macula portion, and the annular tongue piece is held in a state where it is uniformly elastically pressed. Therefore, even when the inner diameter of the annular tongue piece is larger than that of the conventional case, that is, when the inner diameter of the annular tongue piece is reduced, the sealing performance between the packing and the lateral branch pipe is maintained well. It can be loosened to reduce the tightening allowance, making it possible to connect the side branch pipe with less force during connection construction, and to eliminate the trouble of applying a special lubricant. .
According to a fourth aspect of the present invention, there is provided a substantially cylindrical main body portion that is in close contact with the inner peripheral side of the side branch pipe connecting pipe portion of the drain pipe joint, and a seal for projecting inward from the inner periphery to the entire periphery of the main body portion. And a hard layer harder than other portions is provided over the entire circumference at the tip of the main body.
Thereby, the shape accuracy of the lateral branch pipe connecting packing can be secured.

  According to the present invention, the problem of abnormal noise that occurs when the end of a side branch pipe collides with a pipe stopper is eliminated, and the drain pipe joint is formed by the side branch pipe extending and being pressed against the pipe stopper. No troubles such as cracks.

[Embodiment 1]
Next, an embodiment of the present invention will be described with reference to FIGS.
First, a horizontal branch pipe connecting pipe portion (hereinafter simply referred to as a “connecting pipe portion”) of a drainage pipe joint to which the horizontal branch pipe 52 is connected using the side branch pipe connecting packing (hereinafter simply referred to as “packing”) 1 of the present example. ”) Will be described. The horizontal branch pipe 52 is not particularly required to be changed and will be described with the same reference numerals.
As shown in FIG. 3, the connecting pipe portion 10 is provided so as to protrude laterally from the body portion of the drainage pipe joint. The connecting pipe portion 10 is not provided with a pipe stopper 51a (indicated by a two-dot chain line in the drawing) for restricting the insertion amount of the side branch pipe 52, which has been provided on the base side in the past. The function of the pipe stopper 51a is performed by a stopper edge 3 provided on the packing 1 side as described below.

  Now, as shown in FIG. 1, the packing 1 of the present example is mainly composed of a main body 2 formed by molding hard rubber into a substantially cylindrical shape, and the main body 2 is formed on the inner periphery of the connecting pipe portion 10. It is formed in an outer diameter that can be elastically pressed to the side, and is adhered to the inner peripheral side by an adhesive. The outer peripheral surface of the main body 2 is undulated in a very gentle waveform so that the bonding effect is enhanced and the packing 1 is firmly bonded to the inner peripheral side of the connecting pipe 10. It has become.

  Further, the inner diameter of the main body 2 is slightly larger (generally 1.15 D) than the outer diameter D of the lateral branch pipe 52, and when the lateral branch pipe 52 is inserted into the packing 1, the lateral branch pipe An annular space V is formed between 52 and the main body 2.

  The main body part 2 projects to the inner peripheral side within a range that does not obstruct the drainage flow path of the side branch pipe 52 at the upper end of the insertion tip side (the right end side in the figure, the side to be inserted first, the same applies hereinafter). A stopper edge 3 is provided. The stopper edge 3 is for restricting the amount of insertion by contacting the end surface of the side branch tube 52 on the insertion tip side as described above, and is formed integrally with the main body 2 by hard rubber. Yes.

  Next, from the middle of the inner periphery of the main body 2 to the end of the insertion side (the left end in the figure, the side to be inserted later, the same applies hereinafter), the annular tongue pieces 4 to 6 It is provided in an overhang over the entire circumference. The annular tongue pieces 4 to 6 are formed by integrally molding with the main body portion 2 or separately from the main body portion 2 by using a soft rubber, and are provided at predetermined positions. The sealing performance between the packing 1 and the lateral branch pipe 52 is ensured by being elastically pressed to each other. Moreover, each annular tongue piece 4-6 is inclined and provided in the insertion front end side of the main-body part 2 so that the horizontal branch pipe | tube 52 can be inserted smoothly.

  Further, the inner diameters of the annular tongue pieces 4 to 6 are reduced from the insertion front side to the insertion tip side. That is, among the three-stage annular tongues 4 to 6, the inner diameters of the annular tongue piece 4 and the central annular tongue piece 5 positioned closest to the insertion side are approximately 0. 0 with respect to the outer diameter D of the lateral branch tube 52. The annular tongue 6 is formed with a relatively gentle inner diameter of 9D to 0.95D, and the inner diameter of the annular tongue 6 located closest to the insertion tip is approximately 0.8D to 0.9D. Also, the inner diameter (generally 0.7D) of the annular tongue piece 50a in the conventional packing 50 is gentler.

  Next, on the lower part of the main body 2 on the near side of insertion, there is provided a macula portion 7 projecting in an arc shape along the inner periphery thereof. As shown in FIG. 2, the macula portion 7 is provided over a range of approximately 90 ° at the inner peripheral lower portion of the main body portion 2, and the inner diameter (curvature radius) thereof substantially coincides with the outer diameter of the lateral branch pipe 52. Yes. Thereby, when the side branch pipe 52 is inserted into the inner peripheral side of the packing 1 and the insertion end portion is put on the macula part 7, the center of the side branch pipe 52 and the main body portion 2, that is, the annular tongue pieces 4 to 4. The center of 6 is substantially coincident and concentric, so that the annular tongue pieces 4 to 6 are elastically pressed against the outer peripheral surface of the lateral branch pipe 52 uniformly.

  In the figure, 2a is an alignment mark provided at the upper end of the end face on the front side of the main body 2 and 2b is a chamfering portion for preventing rotation formed on the outer periphery of the main body 2 on the insertion tip side. It is.

  The packing 1 of this example configured as described above is attached by being adhered to the inner peripheral side of the connecting pipe portion 10 using a predetermined adhesive. At this time, the mark 2a is used as a mark to align the packing 1 in the circumferential direction so that the chamfered portion 2b provided on the insertion tip side is aligned with the flat surface portion 10a formed on the inner periphery of the connecting tube portion 10. By inserting, the packing 1 is mounted in a state where the rotation is prevented.

  The drainage pipe joint is provided to the construction site with the packing 1 attached, and when connecting the side branch pipe 52, the side branch pipe 52 is placed on the inner peripheral side of the packing 1, that is, on the inner peripheral side of the annular tongue pieces 4-6. It is sufficient to insert until the stopper edge 3 of the packing 1 comes into contact, and the connecting operation of the lateral branch pipe 52 is completed.

In this example, the packing 1 as described above is used. The packing 1 has the following effects.
That is, the stopper edge 3 for restricting the insertion amount of the lateral branch pipe 52 is provided on the packing 1 side, and is not provided on the connecting pipe portion 10 side as in the prior art. Therefore, even if the lateral branch pipe 52 extends in the axial direction due to heat drainage or an increase in the outside air temperature, the lateral branch pipe 52 is not pressed against the pipe stopper 51a as in the prior art. The extension of the branch pipe 52 is sufficiently allowed, so that there is no problem such as cracking of the drainage pipe joint as in the prior art, and no abnormal noise is generated.

  Furthermore, since it is not necessary to provide the conventional pipe stopper 51a on the connecting pipe portion 10 side, the shape is simplified and the manufacture of the drainage pipe joint (particularly, the mold removing operation) is facilitated.

  In addition, as in the past, as an approximately cylindrical packing used when joining the lateral branch pipe to the connecting pipe portion, an annular plate portion made of hard rubber is provided at the end on the insertion tip side, which projects to the inner peripheral side. There is something, and this annular plate part closed the gap between the end face of the side branch pipe and the stopper edge provided on the connection pipe part side, thereby preventing leakage or catching wastewater waste etc. was there. However, since the annular plate portion in this conventional packing is formed over the entire inner circumference, depending on the diameter of the connected side branch pipe, this annular plate portion may obstruct the drainage flow path, and The restriction of the amount of insertion of the branch pipe was still performed by the stopper edge, and thus had the same problem as described above. On the other hand, the packing 1 of this example is provided with a stopper edge 3 at the upper end of the insertion tip side that does not obstruct the drainage flow path, while eliminating the pipe stopper 51a on the conventional connecting pipe part 10 side. Since the insertion amount of the horizontal branch pipe 52 is regulated by the stopper edge 3, the drainage flow path of the horizontal branch pipe 52 is not obstructed, and the drainage pipe joint is cracked by the extension of the horizontal branch pipe 52. It is surely prevented.

  Next, the packing portion 1 of the present example is provided with a macula portion 7. According to this macula portion 7, the lateral branch pipe 52 is supported from below and connected and held concentrically with the packing 1, that is, the annular tongue pieces 4-6. It has come to be. Therefore, the annular tongue pieces 4 to 6 are always elastically pressed against the lateral branch pipe 52 to ensure a sealing property between them, and from this, the inner diameter of the annular tongue piece 50a is tight as in the prior art. (Approximately 0.7D) That is, it is not necessary to set the tightening margin large, and it is possible to reduce the tightening margin by forming relatively loosely (approximately 0.8D to 0.95D). As a result, when inserting the lateral branch pipe 52 into the inner peripheral side of the packing 1, it is not necessary to apply a lubricant to the annular tongue piece 50a and press-fit with a large force as in the prior art. As a result, it is possible to remarkably improve the workability of connecting the lateral branch pipe while maintaining the sealing performance of the packing 1 well.

  Further, the inner diameter of the main body 2 is slightly larger than the outer diameter D of the side branch pipe 52 (generally 1.15D), and an annular space V is formed between the side branch pipe 52 and the main body 2. It has come to be. According to this space portion V, the side branch pipe 52 can be slightly tilted in the vertical direction with the macula portion 7 as a fulcrum, so that the side branch pipe 52 can be connected with a slight gradient, Since some axial misalignment between the side branch pipe 52 and the connecting pipe portion 10 is absorbed, the workability can be improved also in this respect. In this case as well, it is the same that the sealing performance between the lateral branch pipe 52 and the connecting pipe portion 10 is maintained well.

  Next, FIGS. 4 to 7 show an embodiment of another aspect of the present invention, in which a lateral branch pipe 52 ′ having an outer diameter that is about half of the lateral branch pipe 52 can be connected to the connecting pipe portion 10. A tube packing 20 is shown.

  The packing 20 includes an outer ring portion 21 that can be in close contact with the inner peripheral side of the connecting pipe portion 10, and an inner ring portion 22 that is integrally formed in contact with the lower portion of the outer ring portion 21, and includes the outer ring portion 21 and the inner ring portion. The space 22 is closed with a shielding edge 23 in a watertight manner.

  Similar to the outer peripheral surface of the main body 2, the outer peripheral surface of the outer ring portion 21 is formed in a gentle wave shape in order to enhance the bonding effect. Further, similarly to the main body 2, a mark 21 a and a chamfer 21 b are formed. The inner ring portion 22 is provided with a stopper edge 24, annular tongue pieces 25 to 27, and a macula portion 28 in the same manner as the packing 1.

  Also with this different diameter pipe packing 20, the insertion amount of the side branch pipe 52 ′ is restricted by the stopper edge 24, and the side branch pipe 52 ′ is supported concentrically with the inner ring part 22 by the macula part 28, and the annular tongue piece 25. .. -27 are elastically pressed uniformly against the horizontal branch pipe 52 ', so that the inner diameter of the annular tongue pieces 25-27 can be made smaller than before, thereby improving the workability at the time of connection. . Further, by forming the inner ring portion 22 with an inner diameter that is larger than the outer diameter of the lateral branch tube 52 ′ by a certain dimension, an annular space V ′ is formed between the lateral branch tube 52 ′ and the inner ring portion 22. By using this space V ′, the same effect as described above can be obtained.

  In the embodiment described above, the case where the annular tongue pieces 4 to 6 or 25 to 27 are provided in three stages is illustrated, but the present invention is not limited to this, and the annular tongue pieces are provided in one or two stages. A stage may be sufficient and what provided four or more stages may be sufficient.

  In the present invention, since the stopper edge for restricting the amount of insertion of the side branch pipe is provided on the packing side, and what was conventionally provided on the drain pipe joint side is excluded, the side branch pipe is extended by heat drainage or the like However, it is not pressed against the drainage pipe joint, so that troubles such as cracking of the drainage pipe joint or abnormal noise due to the extension of the side branch pipe can be eliminated.

  In addition, since the side branch pipe is concentrically connected to the packing and the annular tongue is uniformly elastically pressed against the packing by providing the macula portion, the inner diameter of the annular tongue is increased to reduce the tightening allowance. Thus, the side branch pipe can be inserted into the inner peripheral side of the packing with a small force, and its workability can be greatly improved.

  Further, the annular tongue piece is always elastically pressed against the lateral branch pipe at all times, so that an uneven load is not applied to the annular tongue piece due to the weight of the lateral branch pipe as in the prior art. Therefore, deterioration of the sealing performance of the packing due to aging is suppressed, and the life can be extended.

  In addition, by utilizing the space formed between the packing and the side branch pipe, the side branch pipe can be connected to the drain pipe joint in a state where the side branch pipe has an appropriate gradient. Can absorb a slight axial misalignment of the lateral branch pipe and can be connected. In this respect as well, the connection workability can be improved.

FIG. 8 shows a modification of the packing 1 according to this embodiment. Here, FIG. 8 (A) is a front view of the packing, and FIG. 8 (B) is a cross-sectional view (plane cross-sectional view) taken along line BB in FIG.
The packing 100 according to the modified example is made of rubber. As shown in FIG. 8B, the main body 102 that is mounted on the inner peripheral side of the distal end of the connecting pipe 10 and the inner periphery of the main body 2. And a tubular tongue 104 for sealing projecting inward over the entire circumference.
On the outer peripheral surface of the main body 102, a rectangular groove 102m into which the inner flange portion 10s at the distal end of the connecting pipe portion 10 is fitted is formed in the circumferential direction. Further, a hard layer 102c is provided at the tip portion of the main body 102 (the tip side from the square groove 102m). Further, the main body 102 is formed with a macula portion 107 extending in an arc along the inner periphery of the lower end of the tip portion.

  The hard layer 102c is for ensuring the molding accuracy of the packing 100 when the packing 100 is molded with rubber. Conventionally, a ring-shaped stainless steel plate or steel plate has been used instead of the hard layer 102c. That is, by forming the packing with the stainless steel plate or steel plate inserted into the mold, the shape accuracy of the packing is ensured. However, since the adhesion between the main body of the packing and the stainless steel plate is not good, there is a problem that the process for adhering both is troublesome and the cost is increased. In addition, after forming the packing, there is a problem that when the stainless steel plate or the like is deformed by receiving an external force, the packing is also deformed. However, as described above, by forming the hard layer 102c with rubber, the adhesion between the hard layer 102c and the main body 102 of the packing 100 is improved, and the cost can be further reduced. Moreover, even if an impact or the like is applied to the packing 100 after the molding of the packing 100, the hard layer 102c returns to the original shape, and the shape accuracy is not affected.

As a material of the packing 100, for example, ethylene / propylene rubber which is a kind of synthetic rubber is used. Further, the hardness of the main body 102 of the packing 100 is set to, for example, Hs60, and the hardness of the hard layer 102c is set to, for example, Hs90.
In addition, although the example which forms the hard layer 102c with rubber | gum was shown, it is also possible to form with resin, such as a plastics, for example.
Further, in the present embodiment, the drain side branch pipe packing has been described as an example, but by omitting the macula portion 107, the drain side branch pipe packing can also be used.

It is a longitudinal cross-sectional view of the packing for horizontal branch pipe connection regarding the Example of this invention. It is A arrow directional view of FIG. 1, Comprising: It is a front view of the packing for horizontal branch pipe connections. It is a longitudinal cross-sectional view of a horizontal branch pipe connecting pipe part in a state where the horizontal branch pipe is connected. FIG. 5 is a longitudinal cross-sectional view of a packing for connecting a lateral branch pipe according to another embodiment, the packing for connecting a different diameter pipe. It is a front view of packing for different diameter pipes. It is a rear view of packing for different diameter pipes. It is a longitudinal cross-sectional view of the side branch pipe connection pipe part in the state where the small diameter side branch pipe was connected using the different diameter pipe connection packing. It is the front view (A figure) of the packing for horizontal branch pipe connection of another aspect, and BB arrow sectional drawing (B figure) of A figure. It is a longitudinal cross-sectional view of the conventional packing. It is a partial longitudinal cross-sectional view of the horizontal branch pipe connecting pipe part in the state where the packing is mounted. It is a partial longitudinal cross-sectional view of the horizontal branch pipe connection pipe part in the state where the horizontal branch pipe was connected using the conventional packing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Side branch pipe connection packing 2 Main body part 3 Stopper edge 4-6 Annular tongue piece 7 Macula part 10 Side branch pipe connection pipe part 20 Different diameter pipe connection packing (packing for side branch pipe connection)
V Space D Outer diameter of side branch pipe 50 Conventional side branch pipe connection packing, 50a ... annular tongue 51 side branch pipe connection pipe part, 51a ... pipe stopper 52 side branch pipe 100 packing 102 main body part 102c hard layer 104 Tubular tongue

Claims (4)

Mainly a substantially cylindrical main body closely attached to the inner peripheral side of the horizontal branch pipe connecting pipe part of the drainage pipe joint, and the upper part of the end part on the insertion tip side of the main body part is the inner peripheral side of the main body part A packing for connecting a lateral branch pipe in a drain pipe joint, wherein a stopper edge for restricting the amount of insertion of the lateral branch pipe inserted into the inner pipe is provided so as to protrude toward the inner peripheral side. An annular tongue piece mainly composed of a substantially cylindrical main body that is in close contact with the inner peripheral side of the horizontal branch pipe connecting pipe portion of the drainage pipe joint, and elastically pressed to the outer periphery of the horizontal branch pipe on the inner peripheral side of the main body portion And a branch pipe is supported concentrically with the inner periphery of the annular tongue piece at a lower portion of the end portion of the main body portion on the near side of the insertion, and the annular tongue piece is connected to the transverse branch. A packing for connecting a lateral branch pipe in a drain pipe joint, characterized in that it is provided with a macula portion for holding the pipe in a state of being uniformly pressed against the pipe. A packing for connecting a lateral branch pipe in a drain pipe joint according to claim 2,
The inner diameter of the main body is appropriately larger than the outer diameter of the lateral branch pipe, and an annular space is provided between the main body and the lateral branch pipe. A lateral branch pipe in a drain pipe joint characterized in that the branch pipe can be connected in an inclined state with respect to the lateral branch pipe connecting pipe portion with the macula portion as a fulcrum in a state where water tightness is secured by the annular tongue piece. Packing for connection. A substantially cylindrical main body that is in close contact with the inner peripheral side of the lateral branch pipe connecting pipe part of the drainage pipe joint;
A tubular tongue piece for sealing projecting inward from the inner periphery to the entire periphery of the main body,
A packing for connecting a lateral branch pipe in a drainage pipe joint, wherein a hard layer harder than other parts is provided at the tip of the main body over the entire circumference.

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