JPH0953782A - Pipe fittings - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To suppress the generation of turbulent flow in the vicinity of a back wall in a joint main body, to ensure a smooth flow of fluid, and to mitigate the flow reduction of a branch pipe. SOLUTION: A main pipe connection port is formed on one side of a joint body,
In a pipe joint in which a plurality of branch pipe connection ports are formed on the outer peripheral portion on the other side of the joint main body having an axis extending radially orthogonal to the axis line of the main pipe connection port, the radial center part of the source pipe connection port is On the back wall of the corresponding joint body, the center of curvature is set near the axis of each of the branch pipe connection ports, and the direction of the fluid flowing from the side of the main pipe connection port is changed toward the side of the branch pipe connection ports. It is characterized in that a curved surface is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint suitable for branching a plurality of branch pipes (flexible pipes) having a sprinkler attached to a main pipe for supplying water for extinguishing fire, for example, in a sprinkler system pipe.

[0002]

2. Description of the Related Art In a sprinkler piping system, a pipe joint shown in FIGS. 7 and 8 is known as a pipe joint for branching and connecting a plurality of branch pipes (flexible pipes) each having a sprinkler attached to a main pipe for supplying water for fire extinguishing. ing. That is, the pipe joint of this type has a main pipe connection port 2 formed on one side of the joint body 1.
And four branch pipe connection ports 3, 3 ... Formed on the outer periphery of the other side of the joint body 1 having an axial line C1 that extends radially orthogonal to the axial line C of the base pipe connection port 2. The structure is such that an internal thread 2A is formed on the inner periphery of the base pipe connection port 2, and an internal thread 3A is formed on the inner periphery of each of the branch pipe connection ports 3, 3. Therefore, the tip side male screw portion 4A of the base pipe 4 which functions as a fire extinguishing water supply pipe is screwed and connected to the base pipe connection port 2, and each of the branch pipe connection ports 3, 3, ... Has a sprinkler head ( By connecting the male screws 5A on the base end side of the four branch pipes (flexible pipes) 5, 5 with attached (not shown), one source pipe 4 to four branch pipes 5, 5 ... A sprinkler system pipe is constructed by connecting ...

According to this type of sprinkler piping,
Due to the melting of the sprinkler head attached to the end portions of the branch pipes 5, 5, ..., the fire extinguishing water in the main pipe 4 will flow down to the branch pipes 5, 5 .. And However, the fire extinguishing water discharged from the main pipe 4 into the joint body 1 along the axis C of the main pipe connection port 2 is
Since it collides with the back wall 1A of the joint body 1 orthogonal to the axis C, a turbulent flow as indicated by the arrow y is partially generated in the vicinity of the back wall 1A, and the turbulent flow y causes a smooth flow indicated by the arrow Y. However, the flow rate of the branch pipes 5, 5 ...

[0004]

That is, the conventional pipe joint of this type has a drawback that the smooth flow of the fluid is obstructed by the turbulent flow generated in the vicinity of the inner wall of the joint body to reduce the flow rate of the branch pipe. Had. Therefore, the invention according to claim 1 provides a pipe joint capable of suppressing the occurrence of turbulent flow in the vicinity of the inner wall in the joint body, ensuring a smooth flow of the fluid, and mitigating the flow rate reduction of the branch pipe. It is intended to be provided.

[0005]

In order to achieve the above object, the invention according to claim 1 is such that a main pipe connecting port formed on one side of a joint body and an axis of the main pipe connecting port are orthogonal to each other. In a pipe joint having a plurality of branch pipe connection ports formed on the outer periphery of the other side of the joint body having a radially extending axis, the inner wall of the joint body to which the radial center of the source pipe connection port corresponds In addition, a center of curvature is set in the vicinity of the axis of each of the branch pipe connection ports, and a curved surface that redirects the fluid flowing from the side of the source pipe connection port toward the side of the branch pipe connection ports is formed. It is characterized by that. According to the invention as set forth in claim 1, the fluid discharged into the inside of the joint main body along the axis of the main pipe connection port collides with the curved surface and smoothly flows toward the branch pipe connection port side along the curved surface. Will be converted. Therefore,
It is possible to suppress the occurrence of turbulence near the inner wall and ensure a smooth flow of fluid.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical sectional side view showing an embodiment of the invention according to claim 1, and FIG. 2 is a plan view of the vertical section of FIG. 1. In these figures, a main pipe connection port 2 is provided on one side of a joint body 1. Four branch pipe connection ports 3, 3, ... Are formed on the outer periphery of the other side of the joint body 1 having an axis C1 that is formed and extends radially orthogonal to the axis C of the base pipe connection port 2. . A female screw 2A is formed on the inner circumference of the main pipe connection port 2, and a female screw 3A is formed on the inner circumference of each of the branch pipe connection ports 3, 3.

On the other hand, the center of curvature O is located at the position corresponding to the radial center of the main pipe connection port 2 on the back wall 1A of the joint body 1.
Are set in the vicinity of the respective axis C1 of the branch pipe connection ports 3, 3, ..., Four curved surfaces 7 having a radius of curvature R are formed, and these curved surfaces 7 are separated by an extending portion 9 in the circumferential direction.
Further, the top portion 8 where the four curved surfaces 7 gather is formed flat. Of course, four curved surfaces 7 may be gathered at one point P as shown by an imaginary line.

A male screw portion 4A on the tip side of a source pipe 4 functioning as a fire extinguishing water supply pipe is screw-connected to a source pipe connection port 2 of the joint body 1, and each of the branch pipe connection ports 3, 3 ... Four branch pipes (flexible pipes) 5, 5 with the sprinkler heads (not shown) attached to the ends of the pipes are screwed to connect the proximal male threads 5A to one of the four branch pipes. A sprinkler system pipe is constructed by branching the pipes 5, 5 ...

With such a structure, the branch pipes 5, 5 ...
The fire extinguishing water discharged from the source pipe 4 into the joint body 1 along the axis C of the source pipe connection port 2 due to the melting of the sprinkler head attached to the tip end of the As indicated by the arrow Y, the flow is smoothly changed toward the branch pipe connection ports 3, 3 ... And flows down in the branch pipes 5, 5. Therefore, it is possible to suppress the occurrence of turbulent flow (see arrow y in FIG. 7) near the inner wall 1A and ensure a smooth flow of the fluid.

In the above embodiment, the joint main body 1 is described as having four branch pipe connection ports 3, 3 ..., However, as shown in FIGS. It is also applicable to a configuration in which one branch pipe connection port 3, 3, 3 is formed, or a configuration in which six branch pipe connection ports 3, 3, ... Are formed in the joint body 1 as shown in FIGS. 5 and 6. . Further, although the configuration is described in which the female screw 2A is formed on the inner circumference of the source pipe connection port 2, a configuration in which a male screw is formed on the outer circumference of the source pipe connection port 2 may be used.

[0011]

As described above, according to the first aspect of the invention, the fluid discharged into the inside of the joint body along the axis of the main pipe connecting port is directed toward the branch pipe connecting port side along the curved surface. Since it is possible to smoothly change the direction, it is possible to suppress the occurrence of turbulent flow near the back wall and to ensure a smooth flow of the fluid, so that it is possible to mitigate the reduction in the flow rate of the branch pipe.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of the invention according to claim 1.

FIG. 2 is a half plan view of FIG.

FIG. 3 is a half-vertical longitudinal side view showing another embodiment of the invention according to claim 1;

FIG. 4 is a half-cut plan view of FIG.

FIG. 5 is a half-section vertical side view showing a different embodiment of the invention according to claim 1;

FIG. 6 is a plan view of a half of FIG.

FIG. 7 is a vertical sectional side view showing a conventional example.

FIG. 8 is a half plan view of FIG.

[Explanation of symbols]

 1 Joint body 1A Inner wall of joint body 2 Source pipe connection port 3 Branch pipe connection port 7 Curved face C Source pipe connection port axis C1 Branch pipe connection axis O Curve center of curvature

Claims (1)

[Claims] 1. A plurality of main pipe connecting ports formed on one side of the joint main body, and a plurality of shafts radially extending orthogonal to the axis of the main pipe connecting port and formed on the outer peripheral portion of the other side of the joint main body. In the pipe joint including the branch pipe connection port, the radial center of the original pipe connection port is on the back wall of the corresponding joint body, and the center of curvature is set near the axis of each of the branch pipe connection ports. A pipe joint, wherein a curved surface is formed to change the direction of the fluid flowing from the main pipe connection port side toward the plurality of branch pipe connection port sides.