JPH064155Y2 - Y type branch pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a Y-type branch pipe which can be used as a penstock for a penstock, a water pipe, a branch pipe for circulating water pipe, and the like.

(Prior Art) A branch pipe that branches from a straight pipe is designed as shown in FIG. That is, the three cylindrical pipes of the main pipe 1, the branch pipe 2 and the branch pipe 3 are connected to each other with balls having diameters D ₁ , D ₂ and D ₃ .
Imagining d ₁ , d ₂ and d ₃ at appropriate positions, two spheres (d
_The conical tubes 4 and 5 are in contact with ₁ , d ₂ ) and (d ₁ , d ₃ ).

The actual range of each of the conical tubes 4 and 5 is the intersection line between them and the intersection line between the conical tubes 4 and 5 and the cylindrical main tube 1, and up to the portion in contact with the virtual sphere. Although not generally extending, in the arrangement for each sphere, each conical tube is considered to have a shape extending from the intersection line to the portion in contact with the sphere.
This also applies to the present invention.

Since the intersection line X of these conical tubes 4 and 5 becomes a structural weak point, the reinforcing girder 6 is installed as shown in FIGS. 5 and 6 to keep the safety. There are two methods for installing the reinforcing girders 6, one in which a plate is sandwiched as shown in FIG. 5 and one in which a T-type (or I-type) girder is installed as shown in FIG.

(Problems to be solved by the invention) However, in the case of a reinforcing girder with a plate sandwiched as shown in Fig. 5, tension acts in the plate thickness direction, so there is concern about the lamellar tear, and as shown in Fig. 6, T In the case of the mold-reinforced girder, since it is asymmetric, there is a drawback that it requires a great deal of labor in manufacturing. Further, since the conical tubes 4 and 5 are asymmetric with respect to the intersection line, the branch tube 3
The hydraulic head loss was larger than that of branch pipe 2.

The present invention solves the problems that the installation of the conventional reinforcement girders for branch pipes may cause lamellar tears, requires a great deal of labor in production, and has a large head loss on one branch pipe. It is what

(Means for Solving the Problems) Therefore, the present invention is directed to a first virtual sphere d ₁ inscribed in the cylindrical main pipe and a second imaginary side inward pipe of the two branch pipes of different diameters. Through the conical pipe circumscribing both of the virtual spheres d _{2 and} the conical pipe circumscribing both of the first virtual sphere d ₁ and the third virtual sphere d ₄ In the Y-shaped branch pipe in which the branch pipes of the two branch pipes are branched and the axial centers of the two conical pipes are asymmetrical with respect to the axial center of the main pipe, and the two conical pipes are connected to each other by a crossing line, The third virtual sphere d ₄ has a diameter and the first virtual sphere d ₁
The distance l ₁ from the second by each equally formed and the distance l from the virtual sphere d ₁ of diameter and said first virtual sphere d _2, the two conical tube the交載line Y Between the conical tube circumscribing both the first virtual sphere d ₁ and the third virtual sphere d ₄ and the small-diameter side branch pipe while having a substantially symmetrical shape with respect to The other conical tube is provided in the above, and this is used as a means for solving the problem.

(Operation) In the present invention, the diameter of the third virtual sphere d ₄ and the distance l ₁ from the _first virtual sphere d ₁ are calculated from the diameter of the _second virtual sphere d ₂ and the first virtual sphere d _1. Since the two conical tubes have a shape that is substantially symmetrical with respect to the intersection line Y by forming the two conical tubes with the same distance l, the structure of the T-type or I-type reinforcing girder is simplified. As a result, manufacturing becomes easier and manufacturing costs can be reduced. Also, even if the cylindrical diameters of the branch pipes are different, it is sufficient to prepare two conical pipes of the same shape, so compared to the case where one conical pipe with a different diameter is prepared, many different types of stock can be stocked. It is not necessary to prepare it, and the manufacturing cost can be greatly reduced.

Embodiment An embodiment of the present invention will be described below with reference to the drawings, and FIGS. 1 to 3 show an embodiment of the present invention.

In the figure, 1 is a cylindrical main pipe, 7 is a large-diameter side branch pipe connected to the main pipe 1 via a conical pipe 9, and 8 is a line of intersection Y with the conical pipe 9.
Is a small-diameter side branch pipe branched from the main pipe 1 via a conical pipe 10 connected with the main pipe 1, and further connected to the same conical pipe 10 via another conical pipe 11. The main pipe 1, the large-diameter side branch pipe 7, The pipe diameters D ₁ , D ₂ , and D ₃ of the small-diameter side branch pipe 8 are D ₁ > D ₂ > D ₃ .

That is, FIG. 1 shows the first virtual sphere d inscribed in the cylindrical main pipe 1.
₁ and the second virtual sphere d ₂ inscribed in the large-diameter side branch pipe 7 of the two branch pipes having different diameters, and the conical pipe 9 circumscribing both the second virtual sphere d ₂ and the first virtual sphere d ₁ and the third virtual The two branch pipes 7 and 8 are branched from the cylindrical main pipe 1 through each of the conical pipes 10 circumscribing both of the spheres d _{4, and} the two cones with respect to the axial center of the main pipe 1. The axes of the tubes 9 and 10 are asymmetrical, and the two conical tubes 9 and 10 are connected to each other by a cross line Y
A third branch sphere, the diameter of the third virtual sphere d ₄ and the distance l ₁ from the _first virtual sphere d ₁ to the diameter of the second virtual sphere d ₂ and the first virtual sphere d _2. The two conical tubes are formed by forming the same as the distance l from the sphere d _1.
9, 10 have a shape substantially symmetrical with respect to the intersection line Y, and the first phantom sphere d ₁ and the third phantom sphere
Another conical tube 11 is disposed between the conical tube 10 and the small-diameter side branch tube 8 which are circumscribed on both of the virtual spheres d ₄ .

In the actual range of the conical tube 9 and the conical tube 10, the shapes of the end portions on the main tube 1 side (the connecting portions with the main tube 1) are slightly different because their axial centers are asymmetric with respect to the axial center of the main tube 1. However, since the others have the same shape, the conical tube 9 and the conical tube 10
Can be said to be substantially symmetrical with respect to the intersection line Y. Note that the conical tubes 9 and 10 are substantially symmetrical with respect to the intersection line Y when the virtual spheres d ₁ , d ₂ and d ₃ and the distances l and l _{1 are used.}
But It means that there is a relationship. Further, 12 in the figure is a T-type reinforcing girder.

(Effect of the Invention) As described in detail above, in the present invention, the third virtual sphere d ₄
Is the diameter and the distance l ₁ from the _first virtual sphere d ₁
Of the phantom sphere d ₂ and the distance ₁ from the _first phantom sphere d ₁ so that the two conical tubes have a substantially symmetrical shape with respect to the intersection line Y. As a result, the structure of the T-type or I-type reinforcing girder is simplified, manufacturing is facilitated, and the manufacturing cost can be reduced. Even if the branch pipes have different cylinder diameters, two types of conical pipes of the same shape can be used.
Since it suffices to prepare the individual pieces, it is not necessary to prepare many kinds of stocks as compared with the case where the conical tubes having different diameters are prepared one by one, and the manufacturing cost can be greatly reduced. In general, a bent branch pipe is hydraulically larger in head loss than the main pipe, but according to the present invention, a change in pipe diameter from the main pipe to both branch pipes is smooth, so that the head loss can be reduced.

[Brief description of drawings]

1 is a plan view of a Y-shaped branch pipe showing an embodiment of the present invention, FIG. 2 is a sectional view taken along line BB of FIG. 1, and FIG. 3 is taken along line CC of FIG.
Sectional drawing, FIG. 4 is a plan view of a conventional Y-shaped branch pipe, FIG. 5 is an A-A sectional view of FIG. 4, and FIG. 6 is an A-A sectional view of FIG. 4 of an example different from FIG. It is a figure. Description of main parts of the figure 1 ... Cylindrical main pipe 7 ... Large diameter side branch pipe 8 ... Small diameter side branch pipe 9,10 ... Conical pipe 11 ... Conical pipe Y ... Intersecting line D ₁ , D ₂ , D ₃ ... Pipe diameter d ₁ , d ₂ , d ₃ … virtual sphere

Claims (1)

[Scope of utility model registration request] 1. A first phantom sphere d inscribed in a cylindrical main pipe (1)
Conical tube circumscribing the second both virtual sphere d ₂ inscribing the large diameter side branch pipe (7) of the two branch pipes of ₁ and different diameters (9)
And the two branch pipes (7) from the cylindrical main pipe (1) through the conical pipes (10) circumscribing both the first virtual sphere d ₁ and the third virtual sphere d _4. (8) is bifurcated, the axes of the two conical tubes (9), (10) are asymmetric with respect to the axis of the main tube (1), and the two conical tubes (9), (10) ) Is a Y-shaped branch pipe connected to each other by a crossover wire, the third virtual sphere d ₄ has a diameter thereof and a distance l from the _first virtual sphere d _1.
1 is made equal to the diameter of the second phantom sphere d ₂ and the distance ₁ from the _first phantom sphere d ₁ , respectively, so that the two conical tubes (9) and (10) are interleaved with each other. The shape is substantially symmetrical with respect to the line Y, and
Another conical pipe (11) is arranged between the conical pipe (10) circumscribing both the virtual sphere d ₁ and the third virtual sphere d ₄ and the small diameter side branch pipe (8). A Y-shaped branch pipe characterized in that