JPH1018405A - Back-flow preventing device and basin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To establish a back-flow preventive device against a waste water drain pipe independently from a manhole main body and simplify the execution of work and mount the device easily even when the waste water drain pipe is connected to the device latter. SOLUTION: This back-flow preventive device 10 is connected to the end of a flow-out pipe of a basin which comprises an in-flow pipeline which is connected to a basin main body and flow-out pipeline which is provided in the lower part of this in-flow pipeline and penetrates the side wall of the manhole main body. One side of a short cylinder-shaped main body 11 is slanted from the upper end to the lower end toward the side of the basin main body, thus forming an opening 12. A cover 13, which is provided with a float 14 on the lower end, is vertically provided on the upper end of the opening 12 so that it may be turned toward the opening 12. The float 14 receives buoyancy by an increase/decrease in the water level in the manhole main body 10. This buoyancy turns the cover 13 and blocks or opens the opening 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backflow prevention device connected to an end of an outflow pipe and capable of preventing backflow of rainwater, and a mass provided with the backflow prevention device.

[0002]

2. Description of the Related Art Conventionally, in addition to an inflow pipe, an outflow pipe is connected to a mass provided in a public sewer, an agricultural settlement drainage channel, or the like. At the outlet of the outflow pipe connected to the above mass,
In general, measures are taken to prevent rainwater from flowing back in the trout. For example, Japanese Unexamined Utility Model Publication No. 4-57582 and Japanese Unexamined Utility Model Publication No. 4-65883 describe examples of masses provided with a mechanism (apparatus) for closing an opening of an outflow pipe connected to the mass.

[0003] A mechanism (device) for closing the opening of the outlet pipe.
Attach a movable piece with a floating body at one end of the V-shaped stick along the side wall and a lid at the other end along the side wall of the mass body, and by the buoyancy of the floating body due to rising water level The movable piece rotates, and a lid provided at the other end of the stick body blocks the opening.

[0004]

However, although the above-described conventional device for preventing backflow of rainwater to the outflow pipe provided in the mass is excellent in function, it has a structure in which the device is attached to the mass main body. Therefore, for example, when the outflow pipe is connected later, there remains a problem that the construction is difficult.

The present invention has been made in view of the above-mentioned problems. An object of the present invention is to solve these problems and to provide a backflow prevention device for an outflow pipe with a mass body. Provide a backflow prevention device that is independent, easy to construct, and can be easily attached even if an outflow pipe is connected later, and a mass provided with the backflow prevention device. is there.

[0006]

According to the first aspect of the present invention, there is provided a backflow prevention device having an inflow pipe communicating with a mass body and an outflow pipe penetrating a side wall of the mass body below the inflow pipe. A backflow prevention device used by being connected to the pipe end of the outflow pipe of the mass formed, wherein one end side of the short cylindrical main body is inclined and opened toward the side wall of the mass main body from the upper end to the lower end. At the upper end of the opening, a lid body provided with a floating body at the lower end is vertically provided rotatably toward the opening side,
The floating body receives buoyancy by the increase and decrease of the water level in the mass body, and the lid is rotated by the buoyancy to close or open the opening.

[0007] In the mass of the present invention described in claim 2,
The backflow prevention device according to claim 1 is connected to an end of the outflow pipe.

As the material of the short cylindrical body, a synthetic resin pipe such as a vinyl chloride resin or a polyethylene resin is suitably used, and a connection port at the other end connected to the outflow pipe is a conventional general-purpose receptacle. It is also possible to use a mouth, or it may simply be a normal outlet.

As the material of the lid, a plate material such as a vinyl chloride resin or a polyethylene resin or a stainless steel plate material is suitably used, and a reinforced resin material such as FRP or fiber reinforced foam is also used. A sealing material is attached to the inside (opening side) of the lid, and a PE sponge, NR, NBR or the like is used for the sealing material in addition to the CR sponge.

A hinge is preferably used as a means for rotatably attaching the lid, and a material thereof is preferably made of stainless steel in addition to a synthetic resin excellent in corrosion resistance.

The angle of inclination of the opening provided from the upper end to the lower end of one end of the main body and inclined inward with respect to the vertical direction is preferably 15 ° to 45 °, and more preferably 30 °.

Further, the lid is set so as to be rotatable toward the opening from a position inclined toward the opening with respect to the vertical direction, and the inclination angle is preferably 3 ° to 10 °. The reason is to regulate the direction of the buoyancy of the floating body received by the drainage to prevent the lid from rotating in the opposite direction of the opening, and to always ensure that the lid is operated to the opening side. It is.

[0013]

In the backflow prevention device according to the first aspect of the present invention, one end of the short cylindrical main body is opened from the upper end to the lower end so as to be inclined toward the side wall of the mass main body. The lid provided with the floating body is rotatably suspended vertically toward the opening side, the floating body receives buoyancy by increasing or decreasing the water level in the mass body, the lid is rotated by this buoyancy, and the opening is closed, Alternatively, when the water level of the drainage in the mass main body is at a lower level, the inclination of the lid to the opening side is small, and when the opening is open, the wastewater from the outflow pipe to the mass is discharged. When the water level in the mass body rises above the lower end face of the outflow pipe, the floating body is turned to the opening side by its buoyancy and the opening is closed, and rainwater etc. The backflow of wastewater can be prevented.

In the mass of the present invention according to claim 2,
Since the backflow prevention device according to the first aspect is connected to the end of the outflow pipe, the installation is simple, and even when the outflow pipe is connected later, the mounting process can be easily performed.

Therefore, in the backflow prevention device and the mass of the present invention, the lid body is reliably operated by the buoyancy corresponding to the water level of the rainwater stored in the mass, and the backflow of rainwater to the outflow pipe is achieved. Is reliably prevented.

[0016]

FIG. 1 is a side view (partial cross section) showing an example of a backflow prevention device according to the present invention. As described in detail below, the backflow prevention device shown in FIG. 1 is used in a mass provided with an inflow pipe communicating with the mass body and an outflow pipe penetrating a side wall of the mass body below the inflow pipe. It is used by connecting to the pipe end of the outflow pipe.

In FIG. 1, one end side of a short tubular main body 11 made of vinyl chloride resin of the backflow prevention device 10 has an angle of approximately 30 ° inward from the upper end to the lower end with respect to the vertical direction.
An inclined opening 12 is provided. At the upper end of the opening 12, a lid 13 provided with a floating body 14 at the lower end is provided with an opening 1.
It is vertically installed rotatably toward two sides. That is, the lid 13 made of a synthetic resin plate such as a vinyl chloride resin is rotatably fixed to an upper end of the main body 11 by a screw or the like by a hinge 15 made of stainless steel.

A sealing member 16 made of CR sponge for sealing the opening 12 is attached to the back surface of the lid 13. Furthermore, a synthetic resin,
For example, an oval floating body 14 made of a polystyrene resin foam or the like is fixed using a mounting bracket 17.

The other end of the main body 11 is provided with a connection port 18 for connecting to the pipe end of the outflow pipe. The connection port 18 may be a conventional general-purpose receptacle, or may be simply a normal outlet.

With the connection port 18 connected to the outflow pipe, the floating body 14 receives buoyancy by increasing or decreasing the water level of the drainage in the mass main body, as will be described in detail below.
Is rotated to close or open the opening 12.

FIG. 2 is a sectional view showing an example of use of the backflow prevention device 10 of the present invention shown in FIG. In FIG. 2, reference numeral 1 denotes a mass, which is provided with a lid 1c on its upper surface, is buried underground in a drainage path for rainwater, and is provided with an inflow pipe 2 communicating therewith. When the rainwater that has flowed in reaches a predetermined water level, it is drained from the other inflow pipe (not shown) provided on the opposite side of the inflow pipe 2 at substantially the same height via a drainage path. It has become.

In the mass 1, the outlet pipe 3 is connected to the lower side of the inlet pipe 2 through the side wall 1b from the side face.
At the end of the pipe, a backflow prevention device 10 is connected to its connection port 18 (FIG. 1).
) Is attached and attached.

The operation of this embodiment will be described below. When the water level of the rainwater in the mass main body 1a of the mass 1 is A, the rainwater is in a state of flowing in from the inflow pipe 2, and at the same time, a state in which the sewage or the like flows in from the outflow pipe 3. At this time, the floating body 14 suspended from the lower end of the lid 12 is at the lowermost position (however, at this time, the lid 13 is approximately 3 ° to 10 ° toward the opening 12 side.
° is set to an inclined state). Therefore, the opening 12 of the outflow pipe 3 is open, and sewage and the like can flow into the mass body 1a.

When the rainwater flows in through the inflow pipe 2 and the water level in the mass body 1a rises and reaches the water level B (that is, substantially equal to the bottom of the outflow pipe 3), the floating body 1
Due to the buoyancy received by the cover 4, the cover 13 gradually moving toward the opening 12 (in the direction of the arrow in the figure) is in a state in which the opening 12 is closed.

At the water level B or higher, the lid 13 is always pressed against the opening 12 by the buoyancy of the floating body 14 which always acts, and the seal attached to the back surface thereof is attached. By material 16 (shown in FIG. 1)
The opening 12 is securely closed, and the backflow of rainwater to the outflow pipe 3 is prevented.

Subsequently, when the water level of the rainwater in the mass body 1a continues to rise and reaches the water level C, the rainwater in the mass body 1a is drained downstream from the inflow pipe connected to the opposite side. Therefore, the water level of the rainwater in the mass body 1a is
While at the water level C above the water level B, the state where the opening 12 is closed by the lid 13 is maintained, and the backflow of rainwater to the outflow pipe 3 is prevented.

[0027]

According to the backflow prevention device of the present invention, one end of the short cylindrical main body is opened from the upper end to the lower end so as to be inclined toward the side wall of the mass main body. A lid provided with a floating body at the lower end is rotatably suspended toward the opening side, and the floating body receives buoyancy by increasing or decreasing the water level in the mass body, and the buoyancy rotates the lid to open the opening. By being closed or opened, when the water level of the drainage in the mass body is lower, the inclination of the lid to the opening side is small, and when the opening is open, the mass from the outlet pipe to the mass is reduced. When the water level of the wastewater in the mass body rises above the lower end face of the outflow pipe, the floating body is turned to the opening side by its buoyancy, and the opening is closed, and the drainage to the outflow pipe is performed. Backflow of drainage such as rainwater can be prevented.

In the mass of the present invention according to claim 2,
Since the backflow prevention device according to the first aspect is connected to the end of the outflow pipe, the installation is simple, and even when the outflow pipe is connected later, the mounting process can be easily performed.

Therefore, in the backflow prevention device and the trout according to the present invention, the lid is reliably operated by the buoyancy corresponding to the water level of the rainwater stored in the trough, and the backflow of the rainwater to the outflow pipe is achieved. Is reliably prevented. Therefore, it is suitably used as a backflow prevention device and a mass.

[Brief description of the drawings]

FIG. 1 is a side view (partial cross section) showing an example of a backflow prevention device of the present invention.

FIG. 2 is a sectional view showing an example of use of the backflow prevention device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mass 1a Mass main body 1b Side wall 2 Inflow pipe 3 Outflow pipe 10 Backflow prevention device 11 Main body 12 Opening 13 Lid 14 Floating body 15 Hinge 16 Sealing material 17 Mounting bracket 18 Connection port

Claims (2)

[Claims] 1. An inflow pipe connected to a pipe end of an outflow pipe of a mass having an inflow pipe communicating with the mass body and an outflow pipe penetrating a side wall of the mass body below the inflow pipe. In the prevention device, one end side of the short cylindrical main body is inclined and opened toward the side wall of the mass main body from the upper end to the lower end, and a lid body provided with a floating body at the lower end is provided at the upper end of the opening at the opening side. The floating body receives buoyancy by the increase and decrease of the water level in the mass body, and the lid is rotated by the buoyancy to close or open the opening. apparatus. 2. A mass, characterized in that the backflow prevention device according to claim 1 is connected to an end of an outflow pipe.