JP5596463B2 - Anti-contamination device for floor drain funnel - Google Patents

Description

  The present invention relates to a pollution control device used for floor drain funnels installed in large numbers in nuclear power plants and the like.

  Conventionally, a large number of floor drain funnels are provided on the floor of a nuclear power plant or the like. The floor drain funnel functions as a tray into which the fluid discharged on the floor flows, and a recess formed on the floor and a drain pipe standing upright so as to protrude upward from the bottom of the recess And a water sealing lid provided so as to surround the drain pipe.

  In the floor drain funnel having the above structure, when the water level of the fluid flowing into the recess exceeds the upper end of the drain pipe, the fluid flows out through the drain pipe. On the other hand, the outside air is prevented from entering the recess through the drain pipe by the water sealing lid and the fluid accumulated in the recess.

  However, when the water level of the fluid in the recess becomes lower than a predetermined height due to evaporation or the like, the sealing action for the drain pipe by the fluid accumulated in the recess cannot be obtained, and the outside air flows into the recess through the water distribution pipe. Furthermore, there is a problem that it flows into the room. Therefore, in the one described in Patent Document 1 below, a pollution prevention device for opening and closing the drain pipe is provided at the upper end inside the drain pipe.

  The pollution control device has a cylinder body that is inserted and attached to the upper end of the drain pipe, and a valve body that is provided inside the cylinder body. The valve body has an elliptical flat plate shape, and is supported by the cylinder body so as to be openable and closable around the central portion in the long axis direction. When the valve body is in the closed position, the valve body is inclined with respect to the cylinder by a shielding angle corresponding to the ratio of the length in the major axis direction to the length in the minor axis direction. The outer peripheral surface is in contact with the inner peripheral surface of the cylinder over the entire periphery. Thereby, the inside of the cylinder is closed and outside air is prevented from entering the recess through the drain pipe. When the valve body is located at the open position, the valve body is inclined by a predetermined angle with respect to the cylindrical body by a predetermined angle (closer to a vertical state), and the outer peripheral surface of the valve body, particularly in the long axis direction, The outer peripheral parts located at both ends are greatly separated radially inward from the inner peripheral surface of the cylindrical body. Thereby, the inside of the cylinder is opened, and the fluid that has entered the inside of the cylinder from its upper end opening is discharged to the outside through the drain pipe.

Japanese Patent No. 2936325

  The fluid may flow backward through the drain pipe. This fluid should not flow into the recess through the water pipe as long as the valve body is in the closed position. However, in the pollution control device described in Patent Document 1, a gap is formed between the valve body and the cylinder depending on the processing accuracy of the valve body, and the valve body cannot seal the inside of the cylinder. There is. In such a case, there was a problem that sewage could not be prevented from flowing back from the water distribution pipe into the recess.

In order to solve the above problems, the present invention provides a drain for a floor drain funnel in which a recess is formed on the floor surface, and a drain pipe is provided on the bottom surface of the recess with its upper end protruding from the bottom surface of the recess. A cylinder body that is inserted into and attached to the upper end of the valve body, and a valve body provided inside the cylinder body so as to be capable of opening and closing between a closed position for closing the cylinder body and an open position for opening the cylinder body, In the floor drain funnel antifouling metal fitting provided with a rotation urging means for urging the valve body from the open position toward the closed position, the inside of the cylinder has an inner periphery of the cylinder. A valve seat member having an annular portion extending annularly along the surface and a straight portion extending so as to bisect the annular portion is provided, and a pair of valve bodies is used as the valve body. Located below the valve seat member and by the straight part The cylinders are arranged so as to be respectively located on one side and the other side of the inside of the cylinder, and the adjacent ends of the pair of valve bodies are parallel to the lower side of the straight part. The pair of valve bodies are provided by a turning biasing force of a predetermined size by the turning biasing means. When the pair of valve bodies are urged to rotate from the open position side to the closed position side and the pair of valve bodies are located at the closed position, one of the pair of valve bodies is positioned on the one side portion side. The valve body is pressed against the lower surfaces of the annular portion and the straight portion of the valve seat member, and the other valve body is pressed against the lower surfaces of the annular portion and the straight portion of the valve seat member positioned on the other side portion side. The cylinder is closed, and the pair of valve bodies are in the open position. In some cases, the ends of the pair of valve bodies that are spaced apart from the rotation axis of the pair of valve bodies to the one side part side and the other side part side are spaced apart downward from the annular part to open the inside of the cylindrical body. It is characterized by.
In this case, the rotation urging means is a torsion coil spring, and the torsion coil spring rotates and urges the pair of valve bodies from the open position side to the close position side. The other end is preferably attached to the pair of valve bodies.
It is desirable that the rotation urging means is a weight provided on each of the pair of valve bodies, and each weight is disposed above the pair of valve bodies.

  According to the present invention having the above-described characteristic configuration, when the fluid flows backward in the drain pipe when the pair of valve bodies are positioned at the closed position, the valve body is closed from the open position when the fluid hits the valve body. Push the valve body to turn in the direction toward the position. Therefore, the valve body pushed by the backflowed fluid does not rotate from the closed position to the open position side, and is pressed more strongly by the valve seat member. Therefore, it is possible to prevent the backflowed fluid from entering the recess.

FIG. 1 is a cross-sectional view showing a floor drain funnel in which a contamination prevention metal fitting according to the present invention is used. FIG. 2 is a cross-sectional view showing the first embodiment of the contamination preventing metal fitting for floor drain funnel according to the present invention used in the floor drain funnel shown in FIG. 1 in a state where the valve body is located at the closed position. is there. FIG. 3 is a cross-sectional view showing the same embodiment with the valve body positioned at the open position. 4 is a view taken in the direction of arrow X in FIG. FIG. 5 is a cross-sectional view showing a second embodiment of the pollution prevention metal fitting for floor drain funnels according to the present invention in a state where the valve body is located at the closed position. FIG. 6 is a cross-sectional view showing the embodiment in a state where the valve body is located at the open position. FIG. 7 is a view taken in the direction of arrow X in FIG.

The best mode for carrying out the present invention will be described below with reference to the drawings.
FIG. 1 shows an example of a floor drain funnel in which the floor drain funnel contamination prevention metal fitting according to the present invention is used. The floor drain funnel 1 is used as a tray for water discharged on the floor Fa of the floor F and other fluids. The floor F is formed with a recess Fb having a circular shape or a square shape in plan view. The funnel body 11 of the floor drain funnel 1 is inserted and fixed in the recess Fb. The funnel body 11 has a container shape with an upper portion opened, and has a planar view shape similar to that of the recess Fa. The upper surface 11a of the funnel body 11 is positioned on the same plane as the floor surface Fa. A funnel lid 12 is removably inserted into the upper end opening of the funnel body 11. The funnel lid 12 is supported by the main body 11 via a support member 13, and the upper end opening of the main body 11 is closed by the funnel lid 12. The upper surface of the funnel lid 12 is positioned on the same plane as the upper surface 11a and the floor surface Fa of the funnel body 11. The funnel lid 12 is formed with a large number of through holes 12a penetrating up and down. The fluid discharged onto the floor surface Fa flows into the funnel body 11 through the through hole 12a.

  A water seal lid 14 is accommodated in the internal space of the funnel body 11. The water sealing lid 14 has a container shape with an open lower end, and the lower end surface is placed on the upper surface of the bottom 11 b of the funnel body 11. By disposing the water sealing lid 14 inside the funnel main body 11, the internal space of the funnel main body 11 is located outside the water sealing lid 14 and the external space 15 positioned outside the water sealing lid 14. It is partitioned into an internal space 16 located. At the lower end portion of the water sealing lid 14, a notch portion 14a penetrating the peripheral wall portion is formed. The outer space 15 and the inner space 16 are communicated with each other by the notch 14a. Therefore, the fluid that has passed through the through hole 12a first enters the outer space 15, and then flows into the inner space 16 through the notch portion 14a.

  The floor F is provided with a drain pipe 17. The drain pipe 17 is disposed with its longitudinal direction directed in the vertical direction, and an upper end portion projects upward from the bottom surface Fc of the recess Fb. The upper end portion of the drain pipe 17 passes through the bottom portion 11 b of the funnel body 11 and projects into the internal space 16. The upper end surface of the drain pipe 17 is positioned below the lower surface of the upper bottom portion 14b of the water sealing lid 14 by a predetermined distance.

  A floor drain funnel contamination prevention device 2 according to the present invention is provided at the upper end of the drain pipe 17. The contamination prevention device 2 has a cylindrical body 21. The cylindrical body 21 has a cylindrical shape with both ends opened, and is inserted into the drain pipe 17 from its upper end opening. The outer peripheral surface of the upper end portion of the cylindrical body 21 is screwed into a female screw portion 17 a provided on the inner peripheral surface of the upper end portion of the drain pipe 17. Then, the cylinder body 21 is fixed to the drain pipe 17 by screwing the cylinder body 21 into the female screw section 17a until the flange section 21a provided at the upper end section of the cylinder body 21 abuts against the upper end surface of the drain pipe 17. Yes. Therefore, in this embodiment, when the water level of the fluid in the internal space 16 becomes higher than the upper surface of the flange portion 21a, the fluid flows into the cylindrical body 21 from its upper end opening. The fluid that has flowed into the cylinder 21 flows into the water distribution pipe 17 from the cylinder 21 and is discharged to the outside through the drain pipe 17. In addition, it is not necessary to form the flange part 21a in the cylinder 21, and the upper end surface of the cylinder 21 and the upper end face of the drain pipe 17 may be located on the same plane.

  A small diameter hole portion 21 b and a large diameter hole portion 21 c are formed inside the cylindrical body 21. The small-diameter hole portion 21b occupies most of the inside of the cylindrical body 21, and extends from the upper end surface of the cylindrical body 21 to the lower side beyond the center in the longitudinal direction. The large diameter hole portion 21c is formed in the remaining portion of the inside of the cylindrical body 21, that is, the lower end portion, and extends from the lower end surface to the lower end portion of the small diameter hole portion 21b. A step surface 21d facing downward is formed in an annular shape between the small diameter hole 21b and the large diameter hole 21c.

  The valve seat member 22 is fitted and fixed in the large diameter hole portion 21c. The valve seat member 22 is configured by an annular portion 22 a having an annular shape, and a straight portion 22 b extending from one side portion of the inner peripheral surface of the annular portion 22 to the other side portion on the diameter line of the annular portion 22. The valve seat member 22 is for closing the inside of the cylindrical body 21 in cooperation with a pair of valve bodies 23 and 24 to be described later, and the pair of valve bodies 23 and 24 are pressed against the lower surface of the valve seat member 22. Contact. Therefore, the valve seat member 22 is not deformed by the pair of valve bodies 23 and 24 that are in press contact with each other, so that the pair of valve bodies 23 and 24 can be supported. It is desirable to have a double structure in which the outside of a core material made of a material having strength is covered with a resin or other material having excellent sealing properties such as rubber.

  The outer diameter of the annular portion 22a is the same as or slightly larger than the inner diameter of the large-diameter hole portion 21c, and is fitted into the large-diameter hole portion 21c in a sealed state. Moreover, the annular portion 22a abuts on the step surface 21d over the entire circumference, thereby being fixed in position and sealed between the annular portion 22a and the step surface 21d. In this state, the straight portion 22b is located on the diameter line of the large-diameter hole portion 21c. The inner diameter of the annular portion 22 is smaller than the inner diameter of the small-diameter hole portion 21b, but the width of the stepped surface 21d (the width in the radial direction of the large-diameter hole portion 21c) is the same as the radial width of the annular portion 22a. When making it equal or more, the inner diameter of the annular portion 22 may be set larger than the inner diameter of the small-diameter hole portion 21b.

  A pair of valve bodies 23 and 24 are provided inside the cylinder 21 below the valve seat member 22, that is, inside the large-diameter hole 21c. The pair of valve bodies 23 and 24 is made of a flat plate made of metal or hard resin, and is formed in a semicircular shape. The pair of valve bodies 23, 24 includes a portion where the inside of the cylindrical body 21 is located on one side (in the left side in FIGS. 2 to 4) in the width direction by the straight portion 22 b and the other side (see FIGS. 2 to 4). When divided into portions located on the right side in FIG. 4, one valve body 23 is located on one side and the other valve body 24 is located on the other side. In addition, the portions forming the strings of the valve bodies 23 and 24 are arranged not only to face each other but also to face the straight portion 22b in the vertical direction and to be parallel to the straight portion 22b. The curvature radius of each part which makes the circular arc of the valve bodies 23 and 24 is mutually the same magnitude | size, and is set smaller than the outer diameter of the annular part 22a, and larger than the inner diameter of the annular part 22a.

  Since the pair of valve bodies 23 and 24 are formed and arranged in the shape as described above, when the valve bodies 23 and 24 are abutted against the lower surface of the valve seat member 22 in a horizontal state, FIGS. As shown in FIG. 4, each of the upper surfaces of the valve bodies 23 and 24 along the arcuate outer peripheral surface is in press contact with one side and the other side of the annular portion 22a. Each part along the outer peripheral surface forming the 24 strings presses and contacts one side and the other side of the straight part 22b. In this state, the upper part and the lower part of the inside of the cylindrical body 21 from the valve seat member 22 are closed by the valve seat member 22 and the valve bodies 23 and 24. Hereinafter, the position of the valve bodies 23 and 24 at this time is referred to as a closed position.

  A pivot 25 is provided inside the cylindrical body 2 located below the valve bodies 23 and 24 (inside the large-diameter hole portion 21c). The pivot 25 is disposed directly below the straight portion 22b and in parallel therewith. Both ends of the pivot 25 are supported by the peripheral wall portion of the cylindrical body 2 in a fixed position.

  Bearing portions 23a and 24a are provided on the lower surfaces of the valve bodies 23 and 24, respectively. The bearing portions 23a and 24a are supported by the cylindrical body 2 via the pivot 25 so as to be rotatable in the vertical direction. Here, since the pivot shaft 25 is disposed directly below the straight portion 22b, the valve bodies 23 and 24 can rotate around the axis (rotation axis) of the pivot shaft 25 in the vicinity of the outer peripheral portion forming the string. It is supported.

  The valve bodies 23 and 24 are rotatable between a closed position shown in FIG. 2 and an open position shown in FIG. As described above, when the valve bodies 23 and 24 are located at the closed position, the inside of the cylindrical body 2 is closed. The open positions of the valve bodies 23 and 24 are positions where the valve bodies 23 and 24 are rotated by a predetermined angle from the closed position so that the valve bodies 23 and 24 move downward in the arcuate portions of the valve bodies 23 and 24. When the valve bodies 23 and 24 are located at the open position, the valve bodies 23 and 24 are separated downward from the valve seat member 22. In particular, the central portion in the circumferential direction of the arc-shaped portions of the valve bodies 23 and 24 and the vicinity thereof are greatly separated downward from the valve seat member 22. Thereby, the inside of the cylinder 2 is opened, and the upper part and the lower part of the valve seat member 22 communicate with each other.

  A coil portion 26 a of a torsion coil spring (rotation urging means) 26 is externally attached to the pivot 25. The one end 26b and the other end 26c of the torsion coil spring 26 abut against the lower surfaces of the valve bodies 23 and 24, respectively, and urge the valve bodies 23 and 24 to rotate in the direction from the open position to the closed position. Yes. Therefore, the valve bodies 23 and 24 are normally maintained in the closed position by the rotational biasing force of the torsion coil spring 26.

  In the floor drain funnel 1 provided with the pollution control device 2 having the above-described configuration, it is assumed that the valve bodies 23 and 24 are now in the closed position. The fluid discharged to the floor surface Fa enters the outer space 15 through the through hole 12a, and further flows into the inner space 16 through the notch portion 14a. When the water level of the fluid in the internal space 16 exceeds the upper end surface of the cylinder 21, the fluid flows into the small diameter hole 21 b of the cylinder 21 from the upper end opening. The fluid flowing into the small diameter hole 21b is supported by the valve bodies 23 and 24. However, when the amount of fluid (fluid supported by the valve bodies 23, 24) flowing into the small-diameter hole 21 b exceeds a predetermined amount, the valve bodies 23, 24 are twisted by the weight of the fluid to rotate the coil spring 26. It is rotated from the closed position to the open position against the dynamic biasing force. As a result, the fluid in the small diameter hole portion 21 b flows between the valve seat member 22 and the valve bodies 23 and 24 and flows out to the large diameter hole portion 21 c. At this time, since the two valve bodies 23 and 24 are simultaneously opened, a large passage area can be secured as an area of the passage communicating between the small diameter hole portion 21b and the large diameter hole portion 21c. Therefore, the fluid in the small diameter hole portion 21b can quickly flow into the large diameter hole portion 21c. The fluid that has flowed into the large-diameter hole portion 21 c flows into the drain pipe 17. Then, it is discharged to the outside through the drain pipe 17.

  Further, when a fluid such as sewage flows backward through the water distribution pipe 17, the fluid pushes the valve bodies 23 and 24 located at the closed position upward. At this time, since the valve bodies 23 and 24 are in contact with the lower surface of the valve seat member 22, the valve bodies 23 and 24 are strongly pressed by the valve seat member 22 by the pressing force of the fluid. Moreover, the upward pressing force of the fluid acting on the valve bodies 23 and 24 acts as a moment in the direction from the open position toward the closed position of the valve bodies 23 and 24. Therefore, even if the fluid flowing backward in the water distribution pipe 17 hits the valve bodies 23 and 24, the valve bodies 23 and 24 are not rotated from the closed position to the open position side. The seat member 22 is more strongly pressed. Therefore, it is possible to reliably prevent sewage and the like from flowing into the internal space 16.

  FIGS. 5-7 shows 2nd Embodiment of the pollution prevention apparatus for floor drain funnels based on this invention. In the contamination preventing apparatus 2A of this embodiment, a pair of weights 27A, 27A, 24a, 27a, 24b are used instead of the torsion coil spring 26 as rotation urging means for urging the valve bodies 23, 24 from the open position side to the closed position side. 27B is used. That is, one end of the connecting rod 28 </ b> A is fixed to the upper surface of the valve body 23. The other end of the connecting rod 28A is located on the other side, that is, on the valve body 24 side beyond the straight portion 22b, and a weight 27A is attached to the other end. When the weight 27A is attached to the valve body 23 in this way, the weight of the weight 27 acts as a rotation biasing force in the direction from the open position to the closed position. And the valve body 23 is maintained in the closed position by this rotational biasing force. The weight 27B is attached to the valve body 24 via a connecting rod 28B, and the connecting rod 28B and the weight 27B are arranged symmetrically with the connecting rod 28A and the weight 27A. Accordingly, the valve body 24 is urged to rotate in the direction from the closed position to the open position by the weight 27B. Since the other structure of the pollution prevention apparatus 2A is the same as that of the pollution prevention apparatus 2 mentioned above, the same code | symbol is attached | subjected to the same part and the description is abbreviate | omitted.

In addition, this invention is not limited to said embodiment, A various deformation | transformation is employable in the range which does not deviate from the summary.
For example, in the above-described embodiment, the drain pipe 17 and the cylindrical body 21 have a plan view shape, that is, a circular cross-sectional shape, but may have a square cross section. In such a case, the valve bodies 23 and 24 are not formed in a semicircular shape but are formed in a square shape.
In the above embodiment, the straight portion 22b is arranged on the diameter line of the annular portion 22a. However, the straight portion 22b is arranged so as to be separated from the diameter line of the annular portion 22a in a direction perpendicular thereto. May be. In that case, the sizes of the valve bodies 23 and 24 are formed in different sizes depending on the position of the straight portion 22b.

  The pollution prevention device for floor drain funnels according to the present invention can be used for a floor drain funnel in which an external fluid may flow backward through a drain pipe.

Fa floor surface Fb recess Fc bottom surface (floor) 1 floor drain funnel 2 floor drain funnel contamination prevention device 2A floor drain funnel contamination prevention device 17 drain pipe 21 cylindrical body 22 valve seat member 22a annular portion 22b straight portion 23 valve body 24 Valve body 26 Torsion coil spring (turning biasing means)
27A weight (turning biasing means)
28A weight (turning biasing means)

Claims (3)

A cylindrical body that has a recess formed in the floor surface, and is attached by being inserted into the upper end of the drain pipe of the floor drain funnel provided with a drain pipe protruding from the bottom surface of the recess on the bottom surface of the recess, Inside the cylindrical body, a valve body provided to be capable of opening and closing between a closed position for closing the cylindrical body and an open position for opening the cylindrical body, and the valve body from the open position toward the closed position. In the contamination prevention bracket for floor drain funnels provided with a rotation biasing means for rotating biasing,
A valve seat member having an annular portion extending annularly along the inner peripheral surface of the cylindrical body and a straight portion extending so as to bisect the annular portion is provided inside the cylindrical body. The pair of valve bodies are located below the valve seat member and divided into one side and the other side inside the cylinder divided by the straight part. The end portions adjacent to each other of the pair of valve bodies are located between the closed position and the open position, respectively, around a rotation axis line disposed in parallel to the lower side of the straight portion. The pair of valve bodies are pivotally biased from the open position side to the closed position side by a pivot biasing force of a predetermined magnitude by the pivot biasing means, and the pair of valve bodies are When in the closed position, one of the pair of valve bodies is An annular portion of the valve seat member in which the body is in pressure contact with each lower surface of the annular portion and the straight portion of the valve seat member located on the one side portion side, and the other valve body is located on the other side portion side When the cylinder body is closed by pressing and contacting each lower surface of the straight portion and the pair of valve bodies are located at the open position, the one side portion side from the rotation axis of the pair of valve bodies An antifouling metal fitting for floor drain funnels, wherein each end portion spaced apart from the other side portion is spaced downward from the annular portion to open the inside of the cylindrical body.   The rotation urging means is a torsion coil spring, and the torsion coil spring urges the pair of valve bodies to rotate from the open position side to the close position side. The floor drain funnel antifouling metal fittings according to claim 1, wherein each is attached to the pair of valve bodies.   2. The floor drain according to claim 1, wherein the rotation urging means is a weight provided on each of the pair of valve bodies, and each weight is disposed above the pair of valve bodies. Antifouling bracket for funnel.

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