JPH0653887U - Packing for spiral tube fittings - Google Patents

Abstract

(57) [Summary] [Purpose] A thin stainless steel spiral pipe is used as a drainage vertical pipe, and it is connected to a drainage collecting pipe through a mechanical joint that compresses the packing in the axial direction of the pipe to reduce the diameter. (EN) Provided is a packing for a spiral pipe joint, which is capable of preventing water leakage due to poor compatibility between the packing and the drainage vertical pipe, which is a problem at the time. [Structure] A packing is characterized in that a spiral groove e is formed on the inner peripheral surface of the packing 10 so as to match the spiral ridge c on the surface of the spiral tube.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a packing for joints of spiral tubes.

[0002]

[Prior art]

 For example, in a multi-story building such as an apartment house or office building, a drainage collecting pipe is installed through the floor slab of the equipment piping space, and a horizontal drainage pipe is connected to the collecting branch pipe of the drainage collecting pipe. At the same time, a drainage system is provided in which drainage vertical pipes are connected above and below the drainage collecting pipes via mechanical joints.

Since a drainage vertical pipe in this drainage facility is required to have a non-combustible material configuration including a drainage collecting pipe, a cast iron pipe, a drainage lining steel pipe, a fiber mortar double-layer pipe, etc. are generally used. Although they are used, the work efficiency in construction is extremely poor because they are heavy, and drainage lining steel pipes and fiber mortar double-layer pipes have a unit length (for example, a diameter of 100 mm and a length of 2000 mm). Although the material cost of) is low, the construction cost is high, while the cast iron pipe does not require a mechanical joint to connect with the drainage collecting pipe, so the construction cost is low, but the material cost is high. There was a problem in that the total cost was high.

By the way, in a conventional drainage facility, for example, a spiral member is provided inside the vertical pipe portion of the drainage collecting pipe, and the drainage that has entered the drainage collecting pipe is swirled, so that Ventilation passages are formed to prevent pressure fluctuations in the horizontal drainage pipe caused by drainage flowing through the drainage pipe. However, the provision of the spiral member inside the drainage collecting pipe in this way causes the cost to increase because the structure of the drainage collecting pipe becomes special and the unit price becomes high. In addition, the conventional drainage system does not have a mechanism to positively swirl the drainage inside the drainage vertical pipe, so the flow velocity in the pipe in the vertical direction is fast, and noise is generated when the water flows down. However, there is a problem that the flow noise becomes large when the value is high.

All of these problems can be solved by using a thin-walled stainless steel spiral tube as the drainage vertical tube. This is because the thin-walled stainless steel spiral tube is not combustible and is light in weight, so that the workability of carrying it around is excellent and the work efficiency can be improved. Moreover, since there is a spiral groove on the inner surface of the thin-walled stainless steel spiral tube for forming, when this spiral tube is used as a drainage standpipe, when drainage flows along the inner surface of the tube, The spiral groove is guided into a spiral shape, which reduces the flow velocity of the drainage in the vertical pipe, and as a result, the flow noise is reduced.

[0006]

[Problems to be solved by the device]

 However, when a thin stainless steel spiral pipe is used as a drainage vertical pipe, the spiral ridge portion c due to goose fastening exists on the outer peripheral surface of the spiral pipe as shown in FIG. When connecting to the drainage collecting pipe via a mechanical joint that compresses the pipe in the axial direction to reduce the diameter, the packing and the spiral pipe (drainage vertical pipe) do not fit well and the degree of adhesion decreases, resulting in a water leakage accident. Is assumed to be a factor of. Therefore, the present invention is a new and useful spiral pipe joint that can prevent water leakage due to poor fitting between the packing and the drainage vertical pipe, which is a problem when a thin-walled stainless steel spiral pipe is used as the drainage vertical pipe. It is intended to provide packing for use.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, in the present invention, a spiral groove is formed on the inner peripheral surface of the packing so as to match the spiral ridge on the surface of the spiral tube.

[0008]

[Action]

 According to the above configuration, when a thin-walled stainless steel spiral pipe is used as the drainage vertical pipe and the drainage vertical pipe is connected to the drainage collecting pipe through the mechanical joint, the spiral pipe (drainage vertical pipe) Since a spiral groove matching the spiral ridge is formed on the inner peripheral surface of the packing, the spiral ridge exists on the surface of the drainage pipe, but the surface of the drainage pipe is covered by the spiral groove. The inner peripheral surface is intimately intimately contacted with each other and high sealing performance is exhibited.

[0009]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a drainage facility A provided in a multi-story building such as an apartment house or office building. As shown in the figure, a drainage gathering pipe 2 is installed by penetrating a floor slab 1 in a facility piping space S. A horizontal drainage pipe 4 is connected to the collecting branch pipe 3 of the water collecting pipe 2, and drainage standing pipes 7 are connected above and below the standing pipe portion 5 of the draining collecting pipe 2 via mechanical joints 6. .

The drainage collecting pipe 2 is made of cast iron, and as shown in FIGS. 2 and 3, a large-diameter portion 8 and a partial flange 9 connected to the large-diameter portion 8 are provided at the end of the vertical pipe portion 5. The large diameter portion 8 is formed with a tapered concave portion a 1 for inserting a packing.

The mechanical joint 6 includes a packing 10 that is inserted into the tapered recess a of the large-diameter portion 8 and a packing pressing member 13 that is connected to the partial flange 9 via a bolt 11 and a nut 12. The packing pressing member 13 comprises a ring member 14 formed with a tapered surface portion b that expands outwardly corresponding to the tapered concave portion a, and a flange 15 corresponding to the partial flange 9 connected to the ring member 14. As the packing 10 is clamped in the tube axis direction by the bolt 11 and the nut 12, the diameter of the packing 10 is reduced by the action of the tapered concave portion a and the tapered surface portion b. The peripheral surface is configured to be strongly pressed against the surface of the drainage vertical pipe 7.

On the other hand, the drainage vertical pipe 7 is made of a thin and narrow stainless steel spirally wound in a spiral shape and fastened with a goby. The drainage vertical pipe 7 having such a structure is lightweight and easy to handle. Moreover, the material cost per unit length (for example, diameter 100 mm and length 2000 mm) is slightly higher than that of drainage lining steel pipe and fiber mortar double-layer pipe, but cast iron pipe Compared with the cast iron pipe, the construction cost is considerably lower than that of the cast iron pipe, but the construction cost is considerably higher than that of the cast iron pipe, but compared with the drainage lining steel pipe and the fiber mortar double-layer pipe. Therefore, the cost of the drainage vertical pipe 7 can be totally reduced.

Moreover, as shown in detail in FIG. 4, the drainage vertical pipe 7 has a spiral groove d formed on the inner surface side of the spiral ridge portion c by tightening with a goby, so that the drainage water is discharged from the inner circumference of the pipe. As it flows along the surface, it is guided by the spiral groove d to form a spiral, which slows down the flow velocity of the drainage in the pipe in the vertical direction. It is possible to reduce the noise flowing down due to the rapid flow. Further, unlike the conventional case, it is possible to swirl the drainage to form a ventilation path in the center of the pipe without providing a spiral body or the like for reducing the in-pipe flow velocity in the vertical pipe portion 5 of the drainage collecting pipe 2. .

As described above, since the drainage vertical pipe 7 itself has the function of reducing the flow noise, it is possible to adopt an inexpensive drainage collecting pipe 2 having a simple structure, and as described above. The total cost of the drainage pipe 7 is low in terms of material cost and construction cost, so that the cost of the drainage system as a whole can be reduced.

By the way, when the drainage vertical pipe 7 is formed as a spiral pipe in this way, a spiral ridge portion c is formed on the surface thereof, so that the inner peripheral surface of the packing 10 has a simple tubular shape. If the inner peripheral surface of the packing 10 is formed on the inner peripheral surface of the packing 10, the surface of the packing 10 corresponding to the spiral ridge portion c is strongly pressed due to the shrinking of the packing 10 by the mechanical joint 6. The packing 10 along the both edges of the ridge c becomes unfamiliar to the surface of the drainage pipe 7, and the surface pressure at both edges of the spiral ridge c of the packing 10 becomes low and the sealing performance deteriorates. There is fear.

However, according to the present invention, as shown in FIGS. 2 and 3, a spiral groove e matching the spiral ridge c of the drainage standpipe 7 is formed on the inner peripheral surface of the packing 10, and Since the spiral ridge c is engaged with the spiral groove e to hold the packing 10 on the drainage vertical pipe 7, the spiral ridge c exists on the surface of the drainage vertical pipe 7, When the packing 10 is reduced in diameter by the mechanical joint 6, the inner peripheral surface of the packing 10 can be intimately and closely contacted with the surface of the drainage vertical pipe 7.

The thin-walled stainless steel spiral pipe used for the drainage vertical pipe 7 has a weak point in strength that it is easily deformed in the diameter reducing direction. In order to make up for this, in the above-described embodiment, the inside of the connecting portion of the drainage vertical pipe 7 to the drainage collecting pipe 2, more specifically, the drainage vertical pipe 7 at the portion corresponding to the packing 10 of the mechanical joint 6 is described. A deformation prevention member 16 is provided inside to prevent the drainage vertical pipe 7 from being reduced in diameter and deformed.

The deformation preventing member 16 is made of, for example, metal such as cast iron or stainless steel, or synthetic resin such as Bakelite, and the inner surface of the drainage pipe 7 at a portion corresponding to the packing 10. The cylindrical body 17 which is in close contact with the drainage pipe is connected to the ring body 18 held by the step portion of the large-diameter portion 8 of the drainage collecting pipe 2 so as not to obstruct the flow of drainage. The upper and lower inner end surfaces of the cylindrical body 17 are formed into tapered surfaces f.

By providing the deformation preventing member 16 in this way, even when the packing 10 is strongly squeezed to improve the sealing property when the drainage vertical pipe 7 is connected to the drainage collecting pipe 2 by the mechanical joint 6. The deformation of the drainage pipe 7 is reliably prevented. By preventing deformation of the drainage vertical pipe 7, leakage of drainage between the surface of the drainage vertical pipe 7 and the packing 10 is reliably prevented, and in addition, the inner peripheral surface of the packing 10 is prevented. By forming a spiral groove e on the inner peripheral surface of the packing 10 so that the inner peripheral surface of the packing 10 is intimately and closely contacted with the surface of the drainage vertical pipe 7, the sealing property at the connection portion of the drainage vertical pipe 7 to the drainage collecting pipe 2 is improved. Can be greatly improved.

[0020]

[Effect of device]

 As described above, according to the present invention, since the spiral groove is formed on the inner peripheral surface of the packing so as to match the spiral ridge on the outer peripheral surface of the spiral tube, the drainage vertical pipe is made of thin stainless steel. Even if a spiral pipe is used and it is connected to the drainage collecting pipe through a mechanical joint that compresses the packing in the axial direction of the pipe to reduce the diameter, the packing and the spiral pipe (drainage vertical pipe) do not fit well. It has the effect of preventing water leakage.

[Brief description of drawings]

FIG. 1 is a side view of a main part of a drainage facility.

FIG. 2 is an exploded perspective view of a main part of the drainage facility.

FIG. 3 is a cross-sectional view of a main part of the drainage facility.

FIG. 4 is a cross-sectional view of a goby portion of a drainage vertical pipe formed by a spiral pipe made of thin-walled stainless steel.

[Explanation of symbols]

 10 ... packing, c ... spiral ridge, e ... spiral groove.

Front page continuation (72) Inventor Hironori Fujisawa 1-6-5 Gouraku, Hirano-ku, Osaka City OM Fitting Industry Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A packing for a joint of a spiral pipe, characterized in that a spiral groove matching the spiral ridge portion of the surface of the spiral pipe is formed on an inner peripheral surface portion of the packing.