JP2592584Y2 - Packing for spiral tube fittings - Google Patents

Description

[Detailed description of the invention]

[0001]

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

[0002]

2. Description of the Related Art For example, in a multi-story building such as an apartment house or an office building, a drainage pipe is installed by penetrating a floor slab of a facility piping space, and the drainage pipe is laterally drawn into a drainage pipe. Drainage facilities are provided that connect pipes and connect drainage standing pipes above and below drainage collecting pipes via mechanical joints and the like.

[0003] The drainage riser in this drainage facility is required to be made of a non-combustible material, including a drainage collecting pipe, so that a cast iron pipe, a lining steel pipe for drainage or a two-layer fiber mortar pipe is generally used. Although they are used, the work efficiency in construction is extremely poor due to their heavy weight, and the drainage lining steel pipe and the fiber mortar double-layer pipe have a unit length (for example, a diameter of 100 mm and a length of 200 mm).
0 mm) is low in material cost but high in construction cost.On the other hand, cast iron pipe does not require a mechanical joint to connect with the drainage collecting pipe, so construction cost is low, but material cost is expensive. There was a problem in that the total cost was high.

In a conventional drainage system, for example, a spiral body is provided inside a standing portion of a drainage collecting pipe, and the drainage that has entered the drainage collecting pipe is swirled to form a ventilation passage in the center of the pipe. Is formed to prevent pressure fluctuation of the horizontal drainage pipe due to drainage flowing through the drainage riser. However, providing the spiral body inside the drainage pipe in this way causes a special structure of the drainage pipe, resulting in a high unit price and an increase in cost. In addition, in the conventional drainage system, since there is no mechanism for positively turning the drainage inside the drainage pipe, the vertical flow velocity in the pipe is high and noise is generated at the time of flowing down. When the air flow is high, there is a problem that the flowing noise increases.

[0005] These problems are caused by using a thin stainless steel spiral pipe as a drainage pipe.
Everything can be solved. Because the thin stainless steel helical tube is made of stainless steel strip
It is manufactured by spirally winding and squeezing it. It is nonflammable and of course lightweight, so that it can be carried around with excellent workability and work efficiency can be improved. . Moreover, since there is a spiral groove on the inner surface of the thin-walled stainless steel helical tube when forming, when this helical tube is used as a drainage riser, when drainage flows along the inner peripheral surface of the tube, The helical groove is guided by the helical groove, thereby reducing the flow velocity of the drainage in the pipe in the vertical direction. As a result, the flow noise is reduced.

[0006]

However, when a thin stainless steel spiral pipe is used as a drainage standing pipe, the outer peripheral surface of the spiral pipe has a spiral ridge formed by goby tightening, as shown in FIG. Because of the presence of c, when the packing is connected to the drainage pipe via a mechanical joint that compresses and reduces the diameter of the packing in the direction of the pipe axis, the packing and the spiral pipe (drainage pipe) are not well-fitted, and the degree of adhesion is poor. It is assumed that water quality will decrease and cause a water leakage accident. Therefore, the present invention provides a new and useful packing for a 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 stainless steel spiral pipe is used as a drainage vertical pipe. Is provided.

[0007]

In order to achieve the above object, according to the present invention, a stainless steel band is spirally wound around a cylindrical inner peripheral surface of a circularly continuous packing.
Communication to suit the spiral ridge portion of the surface of the spiral tube formed by zero tighten
A continuous spiral groove is formed , and a mechanical joy
Ring pressed by the ring member of the packing
A ridge is formed .

[0008]

According to the above construction, when a thin stainless steel spiral pipe is used as a drain pipe and the drain pipe is connected to a drainage collecting pipe via a mechanical joint, a spiral pipe (drain pipe) is used. Since the spiral groove corresponding to the spiral ridge of the tube is formed on the inner peripheral surface of the cylindrical part of the packing,
Despite the presence of a spiral ridge on the surface of the drainage stack,
As the packing is reduced in diameter by the mechanical joint, the inner peripheral surface of the packing comes into close contact with the surface of the drainage riser, and high sealing performance is exhibited.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS 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 an office building. As shown in the figure, a drainage pipe 2 is installed by penetrating a floor slab 1 of a facility piping space S. A horizontal drainage pipe 4 is connected to the collecting branch pipe 3 of the drainage pipe 2, and a drainage pipe 7 is connected above and below the standing pipe portion 5 of the drainage pipe 2 via a mechanical joint 6. .

The drainage pipe 2 is made of cast iron.
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 formed at the end of the upright portion 5, and a packing is provided on the end face side of the large-diameter portion 8. A tapered concave portion a for insertion is provided which is narrower.

The mechanical joint 6 includes a packing 10 inserted into the tapered recess a of the large diameter portion 8,
The partial flange 9 is connected via a bolt 11 and a nut 12.
And the packing pressing member 13 corresponds to the ring member 14 having a tapered surface portion b which expands outwardly corresponding to the tapered recessed portion a, and the partial flange 9. A flange 15 connected to the bolt 11 and the nut 1
2, the packing 10 is reduced in diameter by the action of the tapered concave portion a and the tapered surface portion b as the packing 10 is pressed in the pipe axis direction. It is configured to be strongly pressed.

On the other hand, the drainage riser 7 is made of a spiral tube formed by spirally winding a thin and narrow stainless steel into a spiral shape, and the drainage riser 7 having such a structure is lightweight and easy to handle. In addition to being easy, the material cost per unit length (for example, 100 mm in diameter and 2000 mm in length) is slightly higher than that of a drainage lining steel pipe or a fiber mortar double-layer pipe, but is higher than that of a cast iron pipe. Because the mechanical joint 6 is used, the cost is significantly lower and the construction cost is lower.
Although it is slightly more expensive than a cast iron pipe, it is cheaper than a drainage lining steel pipe or a fiber mortar double-layer pipe, so that a total cost reduction of the drainage vertical pipe 7 can be achieved.

Furthermore, as shown in detail in FIG. 4, the drainage vertical pipe 7 has a spiral groove d on the inner surface side of the spiral ridge portion c formed by goby fastening. When flowing along the surface, it is guided by the spiral groove d to form a spiral shape, which reduces the flow velocity of the drainage in the pipe in the vertical direction. It is possible to reduce the flow noise due to the flow. Also,
As in the related art, the drainage can be swirled to form a ventilation path in the center of the pipe without providing a spiral body or the like for reducing the flow velocity in the pipe in the standing part 5 of the drainage collecting pipe 2 as in the related art.

As described above, since the drainage pipe 7 itself has the function of reducing the flow-down noise, it is possible to adopt a simple structure of the inexpensive drainage pipe 2 as the drainage pipe 2.
As described above, since the drainage riser 7 is totally inexpensive in terms of material cost and construction cost, the cost of the entire drainage facility can be reduced.

When the drainage riser 7 is formed as a spiral tube, a spiral ridge c is formed on the surface of the drainage riser 7 so that the inner peripheral surface of the packing 10 is formed into a simple cylindrical shape. Formed on the inner peripheral surface of the mechanical joint 6
As the diameter of the packing 10 is reduced by the
The surface corresponding to the spiral ridge c is strongly pressed, but the familiarity of the part of the packing 10 along both edges of the spiral ridge c with the surface of the drainage pipe 7 becomes poor, and the spiral of the packing 10 There is a possibility that the surface pressure at both edges of the ridge portion c is reduced, and the sealing performance is reduced.

According to the present invention, however, FIGS.
As shown in the figure, a spiral ridge portion (stainless steel tube) of the drainage riser 7 is provided on the cylindrical inner peripheral surface of the packing 10 which is continuous in a circular shape.
Surface of a spiral tube formed by spirally winding a band of metal
The spiral ridge portion c is formed so as to be continuous with the spiral ridge portion c. The spiral ridge portion c is engaged with the spiral groove e so that the packing 10 is held by the drainage riser 7. Despite the presence of the spiral ridge c on the surface of the drainage riser 7,
When the diameter of the packing 10 is reduced by the mechanical joint 6, the inner peripheral surface of the packing 10 can be brought into close contact with the surface of the drainage riser 7. In addition, packing
As shown in FIG. 2, the outer peripheral surface of
Pressing with the ring member 4 of the packing pressing member 13 of the joint 6
An annular ridge g to be pressed is formed.

The thin stainless steel helical tube used for the drainage riser 7 has a weak point in strength that is easily deformed in the diameter reducing direction. In order to compensate for this, in the above embodiment, the inside of the connection part of the drainage riser 7 to the drainage collecting pipe 2, more specifically, the inside of the drainage riser 7 at a position corresponding to the packing 10 of the mechanical joint 6. In addition, a deformation preventing member 16 for preventing the drainage vertical pipe 7 from being reduced in diameter is provided.

The deformation preventing member 16 is made of metal such as cast iron or stainless steel, or made of synthetic resin such as bakelite, and is provided on the inner surface of the drainage pipe 7 at a position corresponding to the packing 10. Close cylindrical body 1
7 is connected to a ring body 18 held by the step of the large diameter portion 8 of the drainage collecting pipe 2, and the upper and lower portions of the cylindrical body 17 are arranged so as not to obstruct the flow of drainage. The inner end surface is formed as a tapered surface f.

By providing the deformation preventing member 16 in this manner, when the drainage vertical pipe 7 is connected to the drainage collecting pipe 2 by the mechanical joint 6, even if the packing 10 is strongly pressed to improve the sealing performance, the drainage is performed. Deformation of the standing pipe 7 is reliably prevented. By preventing deformation of the drainage riser 7, leakage of drainage between the surface of the drainage riser 7 and the packing 10 is reliably prevented, and in addition, the inner peripheral surface of the packing 10 By forming the spiral groove e so that the inner peripheral surface of the packing 10 is in close contact with the surface of the drainage pipe 7 in a well-fitted manner, the drainage pipe 2 is formed.
Therefore, the sealing performance at the connection portion of the drainage riser 7 can be greatly improved.

[0020]

[Effect of the Invention] As described above, according to the present invention, the circle
A cylindrical inner peripheral surface of the continuous packing form, stainless
A continuous spiral groove is formed along the spiral ridge on the surface of the spiral tube , which is formed by spirally winding a stainless steel band in a spiral shape, and packing packing of a mechanical joint is formed on the outer peripheral surface.
Since the annular ridge is pressed by the ring member of the member, the packing of the packing can be reduced by the mechanical joint.
As a result, the inner peripheral surface of the packing fits tightly on the surface of the spiral tube.
In contact with it, high sealing performance will be exhibited , using a thin stainless steel spiral pipe as a drainage vertical pipe, drainage gathering through a mechanical joint that compresses packing in the direction of the pipe axis and reduces the diameter Even when connected to a pipe, there is an effect that water leakage due to poor adaptation between the packing and the spiral pipe (drainage vertical pipe) can be prevented.

[Brief description of the 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 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 thin stainless steel spiral pipe.

[Explanation of symbols]

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

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 5-36189 (JP, U) JP-A 3-69783 (JP, U) (58) Fields surveyed (Int. Cl. ⁶ , DB name) F16L 23/02

Claims (1)

(57) [Scope of request for utility model registration] 1. A stainless steel band is spirally wound around a cylindrical inner peripheral surface of a packing continuous in a circle.
Continuous matching the helical ridge portion of the surface of the spiral tube formed by clamping
And a spiral groove is formed with, on the outer peripheral surface, a mechanical join
Annular ridge pressed by the ring member of the packing pressing member
A packing for a helical pipe joint characterized by forming a raised portion .