JPH0712282A - Saddle of separate flow device - Google Patents

Abstract

PURPOSE:To provide a saddle structure for achieving a long time reliability in coupling of a saddle of a separate flow device with the main pipe. CONSTITUTION:A separate flow device includes a saddle which is made of plastic and installed at a branch point for separating pressure fluid from the main pipe 40 for transporting the pressure fluid. wherein a cylinder is two divided in the circumferential direction to generate two saddle fragments 10a, 10b in semicylindrical form substantially, and the main pipe as object is pinched by them fast from the sides, and mounting on the main pipe is accomplished. One of the saddle fragments 10a is provided with a branch hole 22 for generating conmunications between the bore and periphery thereof, and at the periphery of the inside opening of the branch hole, a packing receptacle hole 30 in the form curving along the outside surface of the main pipe is provided recessedly in such a way as surrounding said inside opening, and therein a packing 22 is accommodated. The packing 22 has favorably a ring form having a rectangular section, and at its inside surface a groove 32 is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a saddle of a flow dividing device provided on a main pipe for carrying and supplying a pressurized fluid to divide the fluid from the main pipe.

[0002]

2. Description of the Related Art With the recent population concentration in urban areas,
The number of residential buildings, including general housing and condominiums, has increased dramatically. In housing construction, the arrangement of water pipes, gas pipes, etc. is an indispensable requirement. Therefore, in order to introduce water, gas, etc. from those main pipes into individual houses, branch the main pipes into each house. Must be provided with a supply pipe.

Explaining a water pipe as an example, conventionally, water is supplied to each house by providing a diversion device for branching called a dip with saddle on the main pipe. A typical structure thereof is as shown in FIG. 3 (see Japan Water Works Association Standard, JWWA, “Water Faucet with Saddle”, B117-1982, P1 to P27).

As shown in FIG. 3, the flow dividing device 1 has a pair of substantially semi-cylindrical saddle divided bodies 2a and 2b obtained by dividing a cylinder into two in the circumferential direction. One of the saddle divided bodies 2a is formed. The branch hole 3 is opened in the boss portion provided in the center, and the branch hole 3
A fluid control device (water stop device) 4 having a water supply pipe mounting port, a perforator mounting port, and a plug provided therein is screwed to the portion. An O-ring 5 is attached around the inner opening of the branch hole 3. Flat plate portions 5a and 5b having bolt holes are formed at both ends of both saddle divided bodies 2a and 2b, and bolts 6 are passed through the bolt holes and tightened with nuts 7, whereby saddle divided bodies 2a and 2b are attached to the main pipe. It is supposed to be fixed.

In the water diversion work, first, the two saddle divided bodies 2a and 2b are positioned so as to sandwich the water main from both sides and fixed by the bolts 6, and then the perforator from the perforator mounting opening of the fluid control device 4. Is inserted and fixed, and the main wall is cut through the branch hole 3 to form a branch hole in the main pipe. When the drilling is completed, water is supplied from the water supply pipe attached to the water supply pipe attachment port. Here, the O-ring 5 provided around the inner opening of the branch hole 3 has a function of sealing the gap so that water does not leak from the joint between the main pipe and the saddle division body 2a. The perforator mounting port is closed with a plug after removing the perforator. In the above construction, water is prevented from leaking to the outside by appropriately operating the water shut-off device 4.

In the conventional flow dividing device including the above-mentioned water faucet with a saddle, both the saddle portion and the fluid control device portion are cast from spheroidal graphite cast iron and further coated to prevent corrosion.
In the case of a water faucet, standards are set for the size, strength, appearance, etc. of each part (see the above-mentioned document). Among them, emphasis is placed on strength and corrosion prevention from the viewpoint of preventing leakage of water pipes. In the case of water pipes, the safety of coating is also considered from the viewpoint of sanitation of drinking water.

[0007]

However, since such a flow dividing device is buried in the ground and used for a very long period of time, its durability is the most important issue. Especially regarding the attachment and fixing of the saddle to the main pipe, new parts are added to the existing main pipe, so compared to the case of making an integral structure from the beginning, its connectivity,
That is, special attention must be paid to the hermeticity.

Conventionally, the airtightness between the branch hole of the saddle and the main pipe has been maintained by an O-ring fitted in a groove recessed around the opening inside the branch hole of the saddle. The use of an O-ring is usually a simple and effective means for maintaining airtightness and watertightness, but it is appropriate and sufficient when used for a fluid with high pressure or a fluid that leaks easily or for a long time. I can't say that. This is because, since the cross section is originally circular, the contact area when deformed by compression from both sides does not become so large. That is, it can be said that the effective area for sealing is relatively small.

Further, the O-ring is usually used for sealing between flat surfaces, but the sealing between the saddle and the main pipe, which is a subject of the present invention, is sealing between curved surfaces. Are different. That is, the sealed portion corresponds to the portion where the cylindrical saddle and the cylindrical side surface of the main pipe intersect each other.

However, in the conventional saddle, as in the case where the groove of the O-ring is provided on a flat surface, it is engraved so that the bottom surface thereof is flat. That is, O of the conventional flow divider
As shown in FIG. 4 showing an enlarged cross-sectional view of the ring mounting portion, O
The bottom surface of the ring mounting groove 8 was flat. When the O-ring mounting groove 8 is provided in this manner, the following inconvenience occurs.

That is, in FIG. 4, the groove is deepest with respect to the inner peripheral surface of the saddle divided body 2a at the position A, that is, at the end of the groove in the circumferential direction of the saddle divided body 2a, while the groove A- A groove is formed at a position on a diameter BB perpendicular to A (that is, a direction perpendicular to the paper surface, B is a point not on the paper surface), that is, at the end of the axial groove of the saddle division 2a. It becomes the shallowest with respect to the inner peripheral surface of the saddle divided body 2a.

Therefore, when the O-ring 5 is fitted in this,
Assuming that the specified depth for the O-ring 5 used at the position A in the circumferential direction is obtained, the groove is too shallow at the position B in the axial direction, and the O-ring 5 projects too much from the groove. As a result, in this state, the saddle split bodies 2a, 2
When b is attached to the main pipe and tightened, the groove is too shallow at the position B, so that even if the O-ring 5 is deformed by the compressive force, the volume cannot be received. Therefore, a gap is created between the saddle divided body 2a and the main pipe, and the saddle divided body 2a is in a floating state. In such a state, even if the sealing can be performed temporarily, the durability for a very long period cannot be expected.

On the contrary, if the specified depth for the O-ring 5 used at the position B is obtained, the groove is too deep at the position A, and the O-ring 5 enters too much of the groove. In an extreme case, the O-ring 5 may be completely immersed in the groove. As a result, when the saddle split body 2a is attached to the main pipe and tightened, the O-ring 5
The deformation will be slight or disappear at all, and the sealing effect cannot be obtained.

Further, even if the groove depth intermediate between the above two extreme cases is selected and sealing is performed over the entire circumference, the compressive force applied to the O-ring 5 is uneven depending on the position. Since the sealing effect varies, the life of the O-ring 5 is shortened and rattling occurs in the connection between the saddle divided bodies 2a and 2b and the main pipe. Therefore, by providing the bottom surface of the O-ring mounting groove 8 in a flat shape, it is not possible to realize the sealing that guarantees the reliability for a long period of time.

Next, in the prior art, the saddle is made by casting. The shape of the saddle and the main must be made so as to closely follow the outer shape of the main so that there is no rattling in the connection. Therefore, sufficient attention must be paid to the smoothness of the inner and outer surfaces and the absence of porosity, cracks, scratches and flash. Furthermore, a coating must be applied on top of it, so that uneven coating and peeling do not occur during the coating, and in the case of water pipes, the material must also satisfy safety, especially from the viewpoint of hygiene.

The present invention has been made in view of the above-mentioned conventional problems, and it is an object of the present invention to provide a saddle structure for realizing long-term reliability in coupling the saddle and the main pipe in the flow dividing device. Has an aim.

[0017]

The saddle of the flow dividing device according to the present invention for achieving the above object is a flow dividing device installed at a branch point for dividing the pressure fluid from a main pipe carrying the pressure fluid. The saddle has two substantially semi-cylindrical saddle divided bodies obtained by dividing the cylinder in two in the circumferential direction, and the saddle divided bodies are fixed to each other while sandwiching the main pipe from both sides. A branch hole that is attached to the main pipe and that communicates the inner and outer peripheries of the one saddle division is opened, and the outer peripheral surface of the main pipe is surrounded by the inner opening of the branch hole. A packing receiving hole having a curved shape is provided along the recess, and the packing is received in the packing receiving hole.

Preferably, the packing has a ring shape with a rectangular cross section, and a groove is formed on the inner peripheral surface thereof. Further, the saddle divided body is formed by molding a synthetic resin. Further, the saddle divided body is formed into an elliptical shape having a minor axis in a direction connecting both ends, and when the saddle divided body is attached to the main pipe, the minor axis flexes and spreads outward so that the saddle divided body comes into close contact with the main pipe. Fixed in the state.

[0019]

[Function] The saddle split body is attached and fixed to the target main pipe,
The branched fluid flows out from the branch hole formed in the main pipe through the branch hole opened in the saddle divided body.

By making the packing receiving hole curved along the outer peripheral surface of the main pipe, the packing receiving hole has a bottom surface having a given constant depth with respect to the inner surface of the saddle wall over the entire circumferential direction thereof. This means that when the saddle split body is fixed to the main pipe, only a part of the packing is not unduly deformed, and the entire packing is uniformly tightened. Therefore, not only the sealing effect is improved, but also the packing is stably maintained for a long period of time to prevent the rattling of the saddle.

Further, by making the packing into a ring shape having a rectangular cross section, the area pressed and contacted by tightening is flat and the contact area is expanded. Therefore, the sealing effect is large and uniform. Further, by providing a groove on the inner peripheral side of the elastic ring, the fluid is also filled in this space. As a result, the packing is pressed by the fluid from the inside to the outside of the groove and further pressed against the main pipe and the saddle, so that the sealing effect is further enhanced.

Furthermore, by using a synthetic resin as the material of the saddle and forming it by a method usually used in resin molding, it is possible to select the material of the saddle from among many high-performance materials satisfying the corrosion resistance and strength. The surface smoothness is easily obtained, and a complicated shape can be easily formed. Also, in the case of resin, it is well compatible with the main pipe.

Further, by making the saddle division into an elliptical shape and elastically deforming it into a perfect circle and attaching it to the main pipe, an elastic force against this deformation is applied toward the center of the cylinder, and the saddle becomes stronger and stronger. Will be fixed against.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a water faucet will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of a flow dividing device having a saddle structure according to the present invention attached to a main pipe. In FIG. 1, the part of the waterproofing device is omitted.

The body of the saddle is composed of substantially semi-cylindrical saddle divided bodies 10a and 10b which are obtained by dividing a cylinder into two in the circumferential direction. Flat plate portions 12a and 12b are formed at both ends of the saddle divided bodies 10a and 10b, respectively, and bolt holes 14a and 14b through which the bolt 13 is inserted are opened in them. When fixing the saddle divided bodies 10a and 10b to the main pipe 40 to be attached, the main pipe 40 is sandwiched by both saddle divided bodies 10a and 10b, and the bolts 14a and 14b are respectively fitted with bolts 13.
Through, and tighten with the nut 15. Be careful not to tighten it in one direction.

A thick boss portion is formed in the center of one saddle division body 10a, and the saddle division body 1 is formed there.
A branch hole 22 that communicates the inner and outer circumferences of 0a is opened.
A branch connecting portion 24 is provided outside the branch hole 22,
A water stop device (not shown) having a water supply pipe mounting port and a perforator mounting port is connected to this. The water shut-off device is attached by, for example, a taper screw 26 or the like provided on the inner wall of the branch connection portion 24 and communicates with the branch hole 22. In addition, a steel ring 27 for reinforcement is provided on the outer peripheral tip of the branch connecting portion 24.
Has been inserted.

A packing receiving hole 30 for fitting the packing 28 is provided around the inner opening of the branch hole 22 so as to surround it. As shown in FIG. 1, the shape of the packing receiving hole 30 is such that the packing 28 is
0 has a shape that fits along the outer peripheral surface. That is, the bottom surface of the packing receiving hole 30 maintains a constant depth from the inner peripheral surface of the saddle divided body 10a at any position in the circumferential direction of the packing receiving hole 30. The depth is set by the dimension of the packing 28 so that the packing effect is most effectively obtained when the packing 28 is compressed by tightening. As a result, the bottom surface of the packing receiving hole 30 has the packing receiving hole 3 in the saddle circumferential direction.
The end of 0 (point A in FIG. 4) is raised toward the inner circumference of the saddle, and the end of the packing receiving hole 30 in the axial direction of the saddle (point B in FIG. 4) has a saddle shape. It is not a flat surface but a curved surface. Although this shape looks complicated, the saddle is formed by resin molding as will be described later, so that the saddle is easily manufactured.

The packing 28 is placed in the packing receiving hole 30.
Is fitted. In this embodiment, as shown in FIG. 2, the packing 28 is made of an elastic material such as butadiene rubber and has a circular ring shape. A groove 32 is provided on the inner peripheral surface of the packing 28, so that the packing 28 has a U-shaped cross section, and has a substantially hollow structure in which the inner peripheral side is open.

The packing 28 has a flat circular ring shape before fitting, but is fitted in a packing receiving hole 30 having a curved bottom surface to be installed in a curved state. This curve is along the outer surface of the main pipe 40.
The depth of the packing receiving hole 30 is set so that the upper surface of the packing 28 is slightly projected from the inner peripheral surface of the saddle divided body 10a. When attached to the pipe 40, the packing 28 is uniformly deformed as a whole and the saddle division body 10a is deformed.
And the main pipe 40, and thereby the saddle division body 1
The gap between 0a and the main pipe 40 is sealed.

In this embodiment, a shoulder portion 33 is provided on the bottom surface of the packing receiving hole 30 in the saddle circumferential direction so as to be raised toward the center thereof, and the packing 2 is in contact therewith.
The inner peripheral side of 8 is pressed more strongly toward the main pipe 40.

As described above, since the surface of the packing 28 is originally flat, the area pressed against the O-ring is large and the sealing effect is large as compared with the O-ring. Moreover, the sealing effect does not vary depending on the position. Further, after the saddle divided bodies 10a and 10b are attached to the main pipe 40 and the work for dividing the flow is completed, an external hole is formed through a hole 42 formed in the main pipe 40 and a branch hole 22 of the saddle divided body 10a. Fluid flows out into the water pipe. At this time, the fluid also enters the groove 32 provided on the inner peripheral side of the packing 28. As a result, the packing 28 receives pressure from the inside of the groove 32 toward the outside. By this pressure, the packing 28 is further pressed against the inner surface of the saddle divided body 10a (the inner wall of the packing receiving hole 30) and the outer surface of the main pipe 40, so that the saddle divided body 10a and the main pipe 40 are separated.
The sealing effect between and is enhanced.

The saddle members 10a and 10b are made of synthetic resin, and are formed by a method generally used in synthetic resin molding. With the recent development of the field of polymer technology, the material of the saddle split bodies 10a and 10b can be selected from among many high-performance materials that satisfy corrosion resistance and strength. By resin molding, smoothness of the surface and uniformity of the inside can be easily obtained, and there is no fear of cracks or scratches in the case of casting, and the product yield is improved. Furthermore, since the resin itself has corrosion resistance, it is not necessary to paint to prevent corrosion. Further, the complicated shapes of the branch hole, the branch connection portion, and the flat plate portion can be easily formed as one body. Furthermore, a design with a good appearance can be easily realized. Further, the resin is more compatible with the main pipe than the cast product and is light in weight, so that it is convenient to carry and handle.

Further, in the present embodiment, the saddle division body 1 described above is used.
The cylindrical portions of 0a and 10b are not perfect circles before attachment, and the direction connecting the flat plate portions 12a or 12b at both ends (horizontal direction in FIG. 1) is slightly shorter than the direction orthogonal thereto (vertical direction in FIG. 1). It is formed in an elliptical shape. Moreover, the length of the minor axis is slightly shorter than the diameter of the main pipe 40. In the embodiment, when the saddle divided bodies 10a and 10b are combined with each other in a state in which the saddle divided bodies 10a and 10b are not attached to each other, the vertical length is 100, and the vertical direction (flat plate portion direction) ) Is designed to have a length of about 95. Therefore, when the main pipe 40 is sandwiched by the two saddle divided bodies 10a and 10b from both sides and tightened by the mounting bolt 13 and the nut 15, the saddle divided bodies 10a and 10b are bent so as to open outward, and finally the main pipe 40 is closed. Shape that closely fits along the outer shape of
That is, it deforms until it becomes a perfect circle. Since an elastic force against this deformation is applied toward the center of the cylinder, the saddle split body 1
0a and 10b are more firmly fixed to the main pipe 40.

Further, as shown in FIG. 1, the bolt holes 14a,
If a stepped portion 20 having a hexagonal cross-sectional shape is provided at the inlet of 14b and the head of the bolt 13 is housed therein in a non-rotatable manner, the bolt head is automatically fixed. By doing so, workability at the time of tightening at the site can be improved. Such a hexagonal step portion 20 can also be easily formed by resin molding.

In the above, the present invention has been mainly described for a water faucet with a saddle for a water pipe. Generally, however, the fluid is diverted from a main pipe for carrying a pressure fluid and supplied to each end. It is applicable to a flow dividing device with a sealing function used at a branch point. That is, the fluid is not limited to water. Further, the fluid may be a gas, and can be applied to gas pipes for supplying various gases.

Although the packing 28 having a U-shaped cross section is used in the above-mentioned embodiment, the present invention is not necessarily limited to this, and a conventional O-ring can be used. In this case, it is preferable that the packing receiving hole has a circular cross section in conformity with the O-ring.

[0037]

As described above in detail with reference to one embodiment, according to the present invention, in the saddle of the flow dividing device used to divert the pressure fluid from the main pipe, the saddle having both corrosion resistance and strength. The structure is realized. In particular, due to the structure of the packing with the internal groove and the packing receiving hole, the saddle can be firmly fixed to the main pipe in a well-balanced manner for a long period of time, and an excellent sealing effect can be obtained. Furthermore, the saddle is made of synthetic resin, which facilitates molding.
Moreover, since the saddle itself is corrosive, painting is unnecessary.

[Brief description of drawings]

FIG. 1 is a transverse cross-sectional view showing a state where a flow dividing device having a saddle structure according to an embodiment of the present invention is attached to a main pipe.

FIG. 2 is a perspective view of a packing according to an embodiment of the present invention.

FIG. 3 is a sectional view of a flow dividing device according to a conventional example.

FIG. 4 is an enlarged cross-sectional view of an O-ring mounting portion of a flow dividing device according to a conventional example.

[Explanation of symbols]

 10a, 10b Saddle division body 12a, 12b Flat plate portion 13 Bolt 14a, 14b Bolt hole 15 Nut 20 Hexagonal step portion 22 Branch hole 24 Branch connection portion 26 Tapered screw 28 Packing 30 Packing receiving hole 32 Groove 40 Main tube 42 Main hole

Claims (4)

[Claims] 1. A saddle of a flow dividing device, which is installed at a branch point for dividing the pressure fluid from a main pipe that conveys the pressure fluid, wherein two saddles having a substantially semi-cylindrical shape are obtained by dividing the cylinder into two in the circumferential direction. A split body, and the saddle split body is attached to the main pipe by fixing them to each other while sandwiching the main pipe from both sides, and one of the saddle split bodies communicates with the inner and outer circumferences thereof. A packing receiving hole having a curved shape is formed along the outer peripheral surface of the main pipe so as to surround the inner opening of the branch hole and to surround the opening, and the packing is received in the packing receiving hole. Saddle of the flow diverter, which is characterized by 2. The saddle according to claim 1, wherein the packing has a ring shape with a rectangular cross section, and a groove is formed on an inner peripheral surface thereof. 3. The saddle of the flow dividing device according to claim 1, wherein the saddle divided body is formed by molding a synthetic resin. 4. The saddle split body is formed into an elliptical shape having a minor axis extending in a direction connecting both ends, and when the saddle split body is attached to the main pipe, the minor axis flexes and spreads outward so that the saddle split body forms the main pipe. The saddle of the flow diverting device according to any one of claims 1 to 3, wherein the saddle is fixed in close contact with the saddle.