JPH11210061A - Pipe with spiral guide passage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly and fully discharge a liquid flowed down as a spiral flow along the spiral guide passage within the pipe main body from an outlet at the lower portion. SOLUTION: A spiral guide passage is provided inside a pipe main body portion 11, and a fluid flowing down spirally along the spiral guide passage is attenuated and discharged from an outlet 15 provided in this pipe having the spiral guide passage. Thus, the fluid flowed down to the lower end portion in the pipe main body 11 is guided by a bottom surface 16 to the outlet, and the bottom surface 16 has sloped surfaces 161, 162 sloped toward the portion on the line extended to the bottom of the pipe at the bottom of the pipe of the outlet 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe with a spiral guideway suitable for use in a natural sewer vertical sewer pipe.

[0002]

2. Description of the Related Art In order to attenuate sewage flowing down in a manhole when the sewage flows into the manhole by natural flow, a vertical pipe for sewage is disclosed, for example, in Japanese Patent Application Laid-Open No. Hei 8-41915. (Drop shaft) has been implemented. A guide path is provided inside the vertical pipe for sewage so as to bend so that the sewage does not flow down linearly. The sewage flows down along the guide path, so that the sewage is in an attenuated state. The sewage in the damped state is discharged laterally from the lower end of the vertical sewage pipe and discharged into the manhole. Therefore, there is no possibility that the sewage flowing down will strongly collide with the bottom of the manhole, and the wear of the bottom of the manhole will be suppressed.

[0003]

However, in such a vertical pipe for sewage, the spiral guideway reaches the lower end of the pipe body, and flows down along the spiral guideway to reach the lower end. Since the fluid has a swirling flow, there is a problem that the fluid is not smoothly discharged from the outlet.

[0004] The present invention solves such a conventional problem and allows the fluid flowing down the pipe body along the spiral guide path to form a swirling flow from the outlet at the lower end thereof without interruption. It is an object of the present invention to provide a tube with a spiral guide path that can smoothly discharge even a small amount.

[0005]

According to the first aspect of the present invention, a spiral guideway is provided inside a pipe main body, and the inside of the pipe flows downward spirally along the spiral guideway. A pipe with a spiral guide path, in which the fluid flowing through the pipe is attenuated and discharged from an outlet provided on the side of the lower end. A pipe with a spiral guideway having a bottom surface leading to the outlet, the bottom having an inclined surface inclined toward an extension of the pipe bottom of the outflow port.

[0006] The invention described in claim 2 of the present application (Invention 2)
The inclined surface of the floor surface has a large inclination angle on the traveling direction side of the fluid that flows down along the spiral guide path and spirals and turns along a portion on the extension of the pipe bottom of the outlet. It is a pipe with a spiral guideway according to the first aspect of the present invention.

In the present invention, as a material for forming the pipe main body and the spiral guide path, there are plastics including metals. Examples of plastics include thermoplastic resins such as polyvinyl chloride, polyethylene, polypropylene, and methacrylic resins, and examples of thermosetting resins include unsaturated polyester resins, vinyl ester resins, and epoxy resins. And reinforced with organic fibers such as inorganic fibers, carbon fibers, aramid fibers, and vinylon fibers.

[0008] The height of each spiral guide path is one of the diameter of the vertical pipe.
/ 20 to 5/12 is preferred. The wall thickness of the spiral guide path varies depending on the diameter, but is usually 1 / the inner diameter of the vertical pipe.
About 20 to 15/100 is preferable. The spiral pitch of the spiral guide path is preferably about 1 to 10.

[0009]

In the pipe with a spiral guideway of the present invention, a bottom surface is formed at a lower end in the pipe main body to guide the flowed-down fluid to the outlet, and the bottom is on an extension of the pipe bottom of the outlet. By having an inclined surface inclined toward the portion, the fluid flowing down as a swirling flow along the spiral guide path in the pipe main body becomes a swirling flow when reaching the lower end in the pipe main body. However, since the swirling flow is weakened by colliding with the inclined surface of the bottom surface, it is made to flow down on the inclined surface toward the extension of the lower part of the outlet, and smoothly from the outlet and even a small amount It can be ejected.

[0010] The inclined surface of the floor is formed of a fluid that flows down along the spiral guide path and spirals around the portion of the floor on the extension of the pipe bottom at the outlet. If the inclination angle on the traveling direction side is made large, the fluid flowing down as a swirling flow along the spiral guide path in the pipe main body becomes a swirling flow when reaching the lower end in the pipe main body. However, since the swirling flow is weakened by colliding strongly with the inclined surface with a large inclination angle of the bottom, after flowing down on the inclined surface toward the extension of the center line of the outlet, even if there is no Discharge can be performed more smoothly.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partial cross-sectional view showing the entire tube with a spiral guideway used in the present invention. As shown in FIG. 1, a pipe 10 with a spiral guideway is provided with a pipe main body 11.
, An air core tube 13 and spiral guide paths 12, 12 '. An air core cylinder 13 having a hollow inside is provided upright at a substantially central portion at an upper portion in the pipe main body 11.

A first spiral guide path 12 is provided between the inner peripheral surface of the tube main body 11 and the outer peripheral surface of the air core tube 13. The inner peripheral surface of the first spiral guide path 12 is bonded to the outer peripheral surface of the air core tube 13. The outer peripheral surface of the first spiral guide path 12 is bonded to the inner peripheral surface of the tube main body 11.

An outlet 15 is provided at the lower end of the pipe body 11, and a second spiral guide path 12 'is disposed inside the pipe body 11 slightly above the pipe top of the outlet 15. Has been established. The outer peripheral surface of the second spiral guide path 12 ′ is
Is adhered to the inner peripheral surface of the. No air core tube is attached to the second spiral guide path 12 '. No spiral guide path is provided between the first spiral guide path 12 and the second spiral guide path 12 ′ inside the pipe main body 11. An inflow port 14 is provided at the upper end of the pipe main body 11.

As shown in FIG. 2 and FIG.
A bottom surface 16 is formed at a lower end portion for guiding the flowed-down fluid to an outlet 15. The bottom surface 16 has inclined surfaces 161 and 162 that are inclined toward the portion on the extension of the pipe bottom of the outlet 15 and slightly inclined toward the outlet 15 (indicated by arrows in the figure). I have. In the pipe with a spiral guideway of this example, the spiral guideway 1
The fluid that has flowed down as a swirling flow along the pipes 2 and 12 ′ has a swirling flow A when reaching the lower end in the pipe main body 11, and collides with the inclined surfaces 161 and 162 of the bottom surface 16. As a result, the swirling flow is weakened, so that the inclined surfaces 161, 16
After flowing down toward the portion on the extension of the outlet 15 on the upper side of the outlet 2, the liquid is smoothly discharged from the outlet 15 without interruption or even in a small amount.

In the example shown in FIG. 4, a floor surface 16 'is formed by an inclined surface 162' on the traveling direction side of a fluid spirally circling by a spiral guideway with an extension of the center line of the outlet 15 as a boundary.
Has a larger inclination angle than the inclined surface 161 'on the traveling source side. In the pipe with the spiral guide path of this example, the fluid flowing down as a swirling flow along the spiral guide paths 12 and 12 ′ in the pipe main body 11 reaches the lower end in the pipe main body 11. Although the swirling flow B is formed, the swirling flow is weakened by strongly colliding with the inclined surface 162 'of the bottom surface 16 having a large inclination angle, and thus the extension of the center line of the outlet 15 on the inclined surfaces 161' and 162 '. After flowing down toward the outlet, the liquid is discharged from the outlet 15 more smoothly without interruption or even in a small amount.

[0016]

The pipe with a spiral guideway of the present invention is constructed as described above, so that the fluid flowing down the pipe body as a swirling flow due to the spiral guideway can be flowed from the outflow port in a small amount. Discharge can be performed smoothly.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view illustrating the overall configuration of a pipe with a spiral guideway of the present invention.

FIG. 2 is a cross-sectional plan view illustrating a lower end portion of the tube main body of the example shown in FIG.

FIG. 3 is an enlarged sectional view showing a main part of the example shown in FIG. 1;

FIG. 4 is an enlarged sectional view showing a main part of another example of a tube with a spiral guideway of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Pipe with a spiral guideway 11 Pipe main body part 12,12 'Helical guideway 15 Outlet 16,16' Bottom surface 161,161 ', 162,162' Inclined surface

Claims (2)

[Claims] 1. A spiral guide path is provided inside a pipe main body, and a fluid flowing downward spirally along the spiral guide path inside is attenuated and discharged from an outlet provided on a side of a lower end portion. A pipe with a spiral guide path adapted to have a bottom surface formed at a lower end portion in the pipe main body to guide the flowed-down fluid to the outlet, and the bottom is an extension of the pipe bottom of the outlet. A pipe with a spiral guideway, characterized by having a slope inclined toward a portion on a line. 2. The inclined surface of the floor is inclined in the direction of travel of the fluid flowing down and spiraling along the spiral guide path, with a boundary on an extension of the pipe bottom of the outlet as a boundary. The pipe with a spiral guideway according to claim 1, wherein the angle is made large.