JP2005300331A - Outflow-preventing device of contaminated dust and contaminated water from drain funnel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for preventing outflow of contaminated dust and contaminated water from a drain funnel, having a simple structure, post-mountable on an existing pipe, capable of draining surely water flowing into the drain funnel, and of surely stopping the contaminated dust or the contaminated water flowing out from inside the drain funnel, concerning the device for preventing outflowing of the contaminated dust or the contaminated water from the drain funnel installed on the floor of the housing of a nuclear power plant, an RI facility or the like. <P>SOLUTION: A funnel pipe fixed on the bottom part of the drain funnel 1 is equipped with an insertable/extractable cylindrical inner housing 2, and the inner housing 2 has a shutoff valve 3 on the bottom part, installed via a hinge 4 with a spring energizing so as to always shut the bottom part of the inner housing. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an apparatus for preventing contaminated dust and sewage from flowing out from a drain funnel installed in a building such as a nuclear power plant or an RI facility. More specifically, this apparatus relates to an apparatus that can drain water flowing into the drain funnel and prevent outflow of contaminated dust or contaminated water from the drain funnel.

  At a nuclear power plant or the like, many drain funnels are installed as a saucer into which fluid discharged to the floor flows.

The conventional drain funnel has the following problems.
1. Due to fluctuations in the level of the sump tank that receives the drainage and a large amount of drainage, polluted dust and contaminated water in the drain pipe will flow out of the drain funnel due to pressure fluctuations in the drain pipe and drainage to other drain funnels. , Could pollute the surrounding environment.
2. In addition, when draining with a hose in the drain funnel, the funnel lid was opened directly and the hose was inserted into the pipe (Fig. 10). However, the hose was removed by catching the foot, or the hose was released due to the reaction force of the high hose pressure, and the contaminated water was sprinkled on the floor surface to expand the contamination. Moreover, such a means was not preferable in view of beauty.
3. Furthermore, the existing funnel was buried in the ground or in concrete, and additional construction could not be performed even if a check valve was to be provided.

The following technologies are being used to solve the above problems.
The one shown in FIG. 11 is inserted into a drain pipe a provided at the bottom of a recess provided on the floor surface, and is supported by a cylinder c supported by an upper flange b and a pin d below the cylinder c. Contamination prevention device for a drain funnel comprising an automatic opening / closing lid e that swings up and down, and a blocking plate f that is fixed to the upper side of the cylinder c and controls the flow of water and prevents the automatic opening / closing lid e from rotating. (See Patent Document 1).

  Further, as shown in FIG. 12, the cup-shaped container h inserted and fixed in the drain pipe g provided on the bottom surface of the concave portion provided on the floor surface, and the drain provided on the bottom plate of the cup-shaped container h are disposed in the container h. A drain funnel antifouling device comprising a spherical float j that opens and closes a hole i is also used (see Patent Document 2).

These two drain funnels are of the type with a water sealing lid attached in advance. In this structure, since the water sealing lid is attached to the drain funnel itself, the water sealing device cannot be retrofitted to the existing drain funnel without the water sealing device.
Japanese Patent Laid-Open No. 11-304991 JP 2002-116289 A

  In a device that prevents the outflow of contaminated dust and sewage from drain funnels installed on the floors of buildings such as nuclear power plants and RI facilities, the water that flows into the drain funnels can be drained reliably, and from within the drain funnels On the other hand, it is possible to reliably close the contaminated dust and contaminated water which are about to flow out, and to provide a dust funnel dust prevention device that can be retrofitted to existing piping and is structurally simple.

Equipped with a cylindrical inner housing that can be inserted into and removed from the funnel piping fixed at the bottom of the drain funnel,
The inner housing has a closing valve attached to a bottom portion through a hinge with a spring that constantly biases the bottom portion of the inner housing.
The top of the inner housing is fixed with a top plate having a large number of openings, and a punching metal is placed on the top plate.
And it has the connection tool engaged with the lever lock coupler attached to the drain hose end in the center part of the top plate.

A shut-off valve was attached to the bottom of the inner housing with a hinge with a spring. Since this shut-off valve is normally closed with a spring, it is possible to reliably prevent the outflow of contaminated dust and contaminated water from the inside of the pipe.
Further, when draining into the funnel, when a predetermined amount of water is accumulated in the inner housing, the weight of the shutoff valve and drainage is added to the shutoff valve, so that the shutoff valve automatically opens to allow drainage.
Furthermore, since the drainage hose can be drained by connecting to a connector provided on the top plate of the inner housing via the lever lock coupler, the drainage hose can be drained while being firmly held.
Since the punching metal is placed on the top plate fixed to the inner housing, coarse dust in the drainage can be removed by both the drain funnel lid and the punching metal before flowing into the inner housing.
And a dust prevention apparatus can be attached even if it retrofits, without modifying existing piping.

A description will be given based on FIGS. FIG. 1 is a cross-sectional view of a state in which a dust prevention device is attached to the drain funnel 1. The dust prevention device includes an inner housing 2 that is installed by being inserted into the bottom of the drain funnel 1, and a closing valve 3 that is provided at the bottom of the inner housing 2. Since the inner housing 2 and the closing valve 3 are attached by a spring hinge 4 having a spring 4 '(FIG. 3), the closing valve 3 always closes the bottom of the inner housing 2 with a spring force.
The inner housing 2 is an O-ring 5 and is in close contact with the inner surface of the funnel pipe 6.
Since the shut-off valve 3 is always closed by the spring 4 ′ (FIGS. 2 and 3) of the hinge 4 with the spring, the dust (see FIG. 1) that dust tends to flow out into the inner housing 2 from the drain pipe 6. This prevents the arrow b).

  Referring to FIG. 2, the shut-off valve 3 that closes the bottom of the inner housing 2 is in close contact with the lower end surface of the inner housing 2 through a packing 8 attached to the periphery thereof with screws 7.

  The inner housing 2 has a flange 9 welded to the top thereof, and is supported on the bottom of the drain funnel 1 through the flange 9. A top plate 10 is welded to the upper portion of the inner housing 2, and a punching metal 11 is placed thereon. As shown in FIG. 2, the top plate 10 has a large number of openings 10 ′, and the liquid flows into the inner housing 2 through the numerous holes of the punching metal 11 and the openings 10 ′ of the top plate 10. It is like that.

  Reference numeral 13 denotes a connector for the lever lock coupler 12 (see FIG. 8). The connection tool 13 is attached to a hole 14 (FIG. 2) provided at the center of the top plate 10. The drain funnel is covered with a drain funnel lid 15 (FIG. 1B) having a large number of openings 15 'through which liquid can pass.

(Drain funnel dust prevention device operation)
The water that has flowed into the drain funnel 1 is removed by the punching metal 11 and then flows into the inner housing 2 where it accumulates. When the water reaches the specified water level, the mass of the accumulated water and the dead weight of the shut-off valve 3 Thus, the stop valve 3 automatically opens downward against the spring force and is drained to the floor drain (FIGS. 1 and 7).

  Further, when draining directly to the drain funnel 1 with a hose, it can be connected to the connector 13 with the dedicated lever lock coupler 12, so that the hose can be drained in a state of being firmly fixed to the upper portion of the inner housing 2 (FIG. 8). .

  When a reverse flow is generated in the drain funnel 1 from below, the stop valve 3 is pressed against the lower end surface of the inner housing 2 as shown in FIG. Can be prevented.

  In addition, by adjusting the spring force of the hinge 4 with the spring and adjusting the pressing force of the shut-off valve 3, when the drain funnel 1 has a negative pressure, outside air can be sucked and the shut-off valve 3 is opened. Can also be used.

(A) is sectional drawing of a dust prevention apparatus, (b) is a top view of a drain funnel cover. It is detail drawing of a dust prevention apparatus, (a) is a longitudinal cross-sectional view, (b) is a top view, (c) is a bottom view. It is detail drawing of a closing valve, (a) is a side view, (b) is a bottom view. The top view of a stop valve. The top view of packing. The top view of a top plate. The figure which shows a state when a stop valve opens and drains. The figure which shows the state when draining using a lever lock coupler. Indicates a backflow prevention state. The figure which shows a well-known drain funnel. A first example of a known dust prevention device. The 2nd example of a well-known dust prevention apparatus.

Explanation of symbols

1 Drain funnel 2 Inner housing 3 Stop valve 4 Hinge
4 'Spring 5 O-ring 6 Funnel piping 7 Screw 8 Packing 9 Flange
10 Top plate 11 Punching metal
12 Lever lock coupler 13 Connector
14 hole (center of top plate) 15 drain funnel lid
15 'opening

Claims (3)

Equipped with a cylindrical inner housing that can be inserted into and removed from the funnel piping fixed at the bottom of the drain funnel,
An apparatus for preventing outflow of dust and contaminated water contaminated from a drain funnel, characterized in that the inner housing has a shut-off valve attached to the bottom via a hinge with a spring that constantly biases the bottom of the inner housing. The dust and polluted water contaminated from the drain funnel according to claim 1, wherein a top plate having a large number of apertures is fixed to an upper portion of the inner housing, and a punching metal is placed on the top plate. Outflow prevention device. The apparatus for preventing outflow of contaminated dust and contaminated water from a drain funnel according to claim 2, further comprising a connector engaging with a lever lock coupler attached to an end of a drainage hose at the center of the top plate.

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