JP2014002157A - Floor wastewater funnel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a floor wastewater funnel with improved backflow prevention, moreover with simple structure and improved operation stability.SOLUTION: A floor wastewater funnel 11 includes a funnel casing 12 embedded in a floor 2 and a connecting pipe 13. Floor wastewater W, flowing from an inflow opening 17 of the funnel casing, is allowed to flow out to wastewater piping 4 of a wastewater treatment system by the connecting pipe. The floor wastewater funnel includes: a funnel lid which is arranged in the inflow opening and has partly inflow sections 35 which are made to accept wastewater flowing from the floor by forming a plurality of inflow holes 37; and a blocking film body 33 with a film opening 41. As a result, when the wastewater flows back to the funnel casing via the connecting pipe, all parts of the blocking film body other than the film opening stick to the inflow section of the funnel lid while receiving a buoyant force and water pressure caused by the backflow of water, thereby blocking the inflow holes of the inflow section against the back-flow from the wastewater piping.

Description

  The present invention relates to a floor drainage funnel installed on a floor of a building in order to collect drainage that has flowed out to the floor in various plant buildings and flow down to drainage pipes of a wastewater treatment system. It is related with the floor drainage funnel suitable when the floor drainage is processed by a common wastewater treatment system for the area.

  In a plant such as a nuclear power plant, wastewater flowing out to the floor (hereinafter referred to as “floor drainage” as appropriate) is generated due to cleaning of the floor in the building, overhaul of equipment, or damage to piping. Therefore, a structure for treating the floor drainage is required, and a floor drainage funnel is provided on the floor of the building as an element of the floor drainage treatment structure. In other words, in floor wastewater treatment, floor wastewater flows down to the drainage system of the plant, and in such floor wastewater treatment, floor wastewater is collected and flowed down to the drainage system drainage piping. A floor drain funnel is provided as a device.

  A floor drain funnel of a typical example includes a funnel casing and a connecting pipe as its basic structure. The funnel casing is formed in a bottomed box shape having an inflow opening at the top, and is buried in the floor so that drainage flowing through the floor in the building can flow in through the inflow opening. On the other hand, the connecting pipe is provided by being assembled at the bottom of the funnel casing, and is connected to the drain pipe. And the floor drainage which flowed in from the inflow opening part of the funnel casing flows down to the drainage pipe of the wastewater treatment system through the connecting pipe.

  In general, in the case of a nuclear power plant, the building has a plurality of floors, and each floor is provided with an area that is distinguished by the radioactivity concentration. Each area is provided with one or more floor drainage funnels, and the floor drainage flowed down by each floor drainage funnel is sent to a common wastewater treatment system for treatment. In other words, in a wastewater treatment system that accepts floor drainage, a drainage pipe connected to a common mother drainage pipe is provided for each floor, and a floor drainage funnel for each area is connected to the drainage pipe for each floor. The floor drainage that flows down from the floor drainage funnel to the drainage pipe is generally sent to the sump tank (drainage collection tank) installed in the basement by the drainage pipe and the mother drainage pipe and stored. It is sent to the apparatus and necessary processing is performed (for example, Patent Document 1).

  The floor drainage treatment in such a nuclear power plant building has a backflow problem and an air tightness problem related to the floor drainage funnel. The backflow problem is caused by the fact that the drainage pipes on each floor are in communication with each other by connecting to the common mother drainage pipe, and the floor drainage generated in one area is connected to the drainage pipe in communication with the other areas. This is a problem of backflow through the floor drain funnel in the area. On the other hand, the air tightness problem is also caused by the fact that the drainage pipes on each floor are in communication with each other, and each area with different radioactivity concentration is in a vented state via the drainage pipe and the floor drainage funnel. As a result, the necessary airtightness between the areas cannot be maintained.

  As for the backflow problem and the airtightness problem related to these floor drain funnels, various funnel structures have been proposed as in the examples disclosed in Patent Documents 2 to 5, for example. However, these funnel structures, for example, in the case of the funnel structures of Patent Documents 2 to 4, are too complicated to lack operational stability and increase the burden of maintenance. In the case of the funnel structure, although it is structurally simple, it is not actually used because it lacks the ability to prevent backflow.

  Therefore, the actual situation is that the backflow problem and the airtightness problem are dealt with by a closed cap method or by a method of making the drain pipe independent. The closure cap method is a method that prevents backflow from flowing out to the floor by closing the inflow opening in the funnel casing of the floor drainage funnel with the closure cap, and avoids airflow between areas. It is. In such a closure cap method, it is necessary for an operator to remove the closure cap when floor drainage occurs, and therefore, if floor drainage occurs suddenly, there is a possibility that the response will be delayed and the contamination will expand. In addition, there is a problem that a worker who removes the closing cap may receive radioactive contamination.

  The method of making drainage pipes independent makes it possible to avoid venting between areas with different standards such as radioactivity concentration through drainage pipes and floor drainage funnels by properly making drainage pipes independent, and to other areas This is a method for preventing the backflow from. Such a drainage pipe independence method has a problem that the number of mother drainage pipes and sump tanks increases according to the degree of independence of the drainage pipe, and the equipment cost increases.

JP 2000-147191 A Japanese Unexamined Patent Publication No. 64-68695 JP 2004-226361 A JP-A-2005-300331 JP 2002-116289 A

  As described above, floor drainage funnels in plant buildings such as nuclear power plants have backflow problems and airtightness problems, and various funnel structures have been proposed. However, these funnel structures are not actually used, and the actual situation is that the closed cap method and the drainage pipe independent method deal with the backflow problem and the air tightness problem. There is a problem with the independent drainage piping system.

  For these reasons, it is strongly desired to develop a floor drainage funnel having high functionality for preventing backflow and airtightness, having a simple structure and excellent operational stability. In particular, in the case of a nuclear power plant building, a small amount of backflow of wastewater from an area with high radioactivity concentration to an area with low radioactivity concentration can lead to radioactivity contamination. There is a demand to avoid backflow as much as possible, and the development of a floor drainage funnel that can meet such demand is strongly desired.

  The present invention has been made in order to meet such a demand, and therefore the problem is that the floor drainage has high functionality for preventing backflow and airtightness, particularly for preventing backflow, and has a simple structure and excellent operational stability. In providing funnels.

  In the present invention, in order to solve the above problems, a funnel casing having an inflow opening in an upper portion and embedded in the floor so that drainage flowing through a floor in a building can flow in through the inflow opening, and A floor drainage funnel comprising a connecting pipe assembled at the bottom of the funnel casing and configured to allow floor drainage flowing from the inflow opening to flow out into the drainage pipe of the wastewater treatment system through the connecting pipe. A float that can be floated by the inflowing drainage is disposed in the funnel casing, and is provided with an inflow hole that becomes an inflow passage of the drainage when the drainage from the floor flows through the inflow opening. A backflow prevention seal body is assembled to the inflow opening, and the drain pipe is connected to the funnel casing via the connecting pipe. The backflow prevention seal body elastically abuts against the float as the float rises due to the drained water, and the inflow hole is sealed against the backflow water. It is said.

  The present invention basically provides a backflow prevention and airtightness to the floor drainage funnel by using a general float trap structure. In other words, when there is no inflow of floor drainage into the floor drainage funnel, the float abuts against the opening on the funnel casing side of the connecting pipe by its own weight, thereby sealing the connecting pipe against the funnel casing side. Make the funnel airtight against the drainage pipe. In addition, when drainage flows into the funnel casing from the drainage pipe connected to the connecting pipe, that is, when backflow occurs, the float floats by the backflow water and comes into contact with the backflow prevention seal body at the inflow opening. Seal the inflow hole. As a result, it is possible to prevent the backflow water flowing into the funnel casing from flowing out to the floor where the floor drainage funnel is installed, and thus backflow can be effectively prevented.

  The above is a basic function in the float type trap structure. In the present invention, the backflow prevention function and the airtightening function, in particular, the backflow prevention function are advanced. In other words, an elastic backflow prevention seal body having an inflow hole that serves as an inflow passage for floor drainage is provided at the inflow opening of the funnel casing, and when the float rises due to the inflow of backflow water into the funnel casing, the backflow prevention to the float The seal body is elastically contacted. For this reason, a highly stable close state can be obtained between the float and the backflow prevention seal body. This is particularly the case with floor drainage funnels that are not in operation for a long period of time, such as floor drainage funnels in a building of a nuclear power plant, and therefore are liable to cause dust to adhere to the float. It is valid. In other words, elastic contact makes it possible to obtain a high close state between the float and the backflow prevention seal body, so that even if dust or the like adheres to the float, a sufficient close state between the float and the backflow prevention seal body is stable. Therefore, sufficient sealing performance can be stably given to the inflow hole, and for example, a high backflow prevention function as required in a building of a nuclear power plant can be realized. Moreover, such a high backflow prevention function can be realized simply by adding an elastic backflow prevention seal body to a general float trap structure that requires a simple structure. Therefore, it is possible to sufficiently meet the demand for a simple structure and excellent operational stability.

  In the present invention, for the floor drain funnel as described above, when the backflow water from the drainage pipe is filled in the funnel casing, the elastic lip portion formed so as to receive the water pressure by the backflow water has the backflow prevention. It is provided on a seal body, and the back flow prevention seal body and the float are brought into contact with the lip portion elastically abutting on the float while receiving water pressure due to back flow water. This is a preferred form.

  In such a floor drainage funnel according to the present invention, the backflow prevention seal body and the float are elastically brought into contact with each other by utilizing the water pressure of the backflow water by the lip portion. For this reason, the highly stable close state in the float and the backflow prevention seal body as described above can be further enhanced.

  Moreover, in the present invention, in order to solve the above-mentioned problem, a funnel casing embedded in the floor so as to have an inflow opening in the upper part and drainage flowing through the floor in the building can flow in through the inflow opening, And a floor drain funnel comprising a connecting pipe assembled at the bottom of the funnel casing, wherein the floor drain flowing from the inflow opening is caused to flow out to the drain pipe of the waste water treatment system by the connecting pipe. A barrier film provided partially with an inflow portion adapted to allow inflow of drainage from the floor by forming a hole, and provided with a funnel lid disposed in the inflow opening, and a membrane opening And when the drainage flows back from the drainage pipe to the funnel casing via the connecting pipe, the membrane of the blocking membrane body is subjected to buoyancy and water pressure due to the backflow water. A portion other than the mouth portion sticks to the inflow portion of the funnel lid, so that each inflow hole of the inflow portion is blocked from the backflow water from the drain pipe. Yes.

  In such a floor drainage funnel according to the present invention, the backflow is prevented by blocking the inflow hole for the floor drainage inflow in the funnel lid against the backflow water by sticking the blocking film body. The blocking of the inflow hole by the sticking of the blocking film body is performed while receiving buoyancy and water pressure due to the backflow water flowing into the funnel casing. Therefore, a high shut-off property of the inflow hole can be obtained, and a high backflow prevention function as required in a nuclear power plant building, for example, can be realized. In addition, since the blocking film body that blocks the inflow hole by the sticking can be operated with a very simple structure, it can sufficiently meet the demand for a simple structure and excellent operational stability.

  Regarding the floor drain funnel as described above, two forms are possible with respect to the initial state of the barrier film body with respect to the funnel lid. In one embodiment, the state in which the barrier film body is separated from the funnel lid is set as an initial state, and the drainage from the floor flows into the funnel casing through the film opening due to the separated state. On the other hand, when drainage flows backward from the drainage pipe to the funnel casing via the connecting pipe, the barrier film body is pushed up by the backflow water, whereby the funnel cover of the barrier film body In another form, the barrier film body is provided so that the barrier film body sticks to the funnel lid as an initial state, and the barrier film body is caused by drainage to flow in from the floor. Is separated from the funnel lid, so that drainage from the floor can flow into the funnel casing through the membrane opening. On the other hand, when drainage flows backward from the drainage pipe to the funnel casing via the connecting pipe, the barrier film body is pushed up by the counterflow water to the funnel lid of the barrier film body. It is made to promote the state of sticking.

  According to the present invention as described above, it has high functionality for preventing backflow, has a simple structure and excellent operational stability, and enables a high backflow prevention function as required in a building of a nuclear power plant, for example. Floor drain funnel is realized.

It is a figure which shows the structure of the waste water treatment system in the nuclear power plant building which applies the floor drain funnel by this invention. It is a figure which shows the structure of the floor drainage funnel by a 1st Example. It is a figure which shows the state into which floor drainage is flowing in about the floor drainage funnel of FIG. It is a figure which shows the state into which backflow water is flowing in about the floor drainage funnel of FIG. It is a figure which expands and shows the part shown with the dashed-dotted line circle in FIG. It is a figure which shows the structure of the floor drainage funnel by a 2nd Example. It is a figure which shows the state into which floor drainage is flowing in about the floor drainage funnel of FIG. It is a figure which shows the state in which backflow water is flowing in about the floor drainage funnel of FIG. It is a figure which shows the structure of the floor drainage funnel by a 3rd Example. It is a figure which shows the state into which floor drainage is flowing in about the floor drainage funnel of FIG. It is a figure which shows the state into which backflow water is flowing in about the floor drainage funnel of FIG.

  Hereinafter, modes for carrying out the present invention will be described. The floor drain funnel according to the present invention is particularly effective in a building of a nuclear power plant. Therefore, in the following, an embodiment relating to a building of a nuclear power plant will be described.

  FIG. 1 schematically shows the configuration of a wastewater treatment system in a nuclear power plant building to which a floor drainage funnel according to the present invention is applied. The building in the example of FIG. 1 has four floors above ground and one basement floor, and each of these floors is provided with a plurality of areas 1 that are distinguished by radioactivity concentration and the like. One or more funnels 3 are provided.

  The floor drain funnel 3 is connected to a drain pipe 4 provided on each floor so that the floor drain generated on the floor 2 can flow down to the drain pipe 4. The drainage pipes 4 on each floor are connected to a common mother drainage pipe 5, and are connected to a sump tank 6 installed on the basement via the mother drainage pipe 5. Then, the floor drainage flowing down from the floor drainage funnel 3 to the drainage pipe 4 is sent to the sump tank 6 through the mother drainage pipe 5 and stored, and when a certain amount is accumulated, it is sent to a wastewater treatment apparatus outside the figure for necessary processing. Applied.

  In such a wastewater treatment system, the drainage pipes 4 on each floor are in communication with each other by connecting to a common mother drainage pipe 5, and thus have a backflow problem and an air tightness problem with respect to the floor drainage funnel 3. What is excellent in backflow prevention and airtightness, particularly in backflow prevention function is required.

  FIG. 2 shows the configuration of the floor drain funnel 11 according to the first embodiment in a simplified manner with respect to the longitudinal sectional state. The floor drain funnel 11 in the present embodiment includes a funnel casing 12, a connecting pipe 13, a float 14, a backflow prevention seal body 15, and a protective lid 16.

  The funnel casing 12 is made of a metal material, for example, stainless steel material, is formed in a bottomed box shape having an inflow opening 17 in the upper portion, and is embedded in the floor 2 of the nuclear power plant building. Around the embedding part of the funnel casing 12, the floor 2 is provided with a gently inclined flow guide surface 2 s, and drainage generated on the floor 2 (the flow is virtually indicated by an arrow W of a two-dot chain line in FIG. 3 and 4 to be described later, it is indicated by a solid arrow W. Hereinafter, the floor drainage W) is collected by the flow guide surface 2s so as to flow into the funnel casing 12 and more specifically into the funnel casing 12. It is made to be able to flow in through an inflow hole 24 of a backflow prevention seal body 15 as will be described later assembled in the opening 17.

  The connecting pipe 13 functions to cause the floor drainage W flowing into the funnel casing 12 to flow down to the drainage pipe 4. For this purpose, the connecting pipe 13 is formed in a pipe structure using a stainless steel material or the like in the same manner as the funnel casing 12, and a part of the connecting pipe 13 projects into the funnel casing 12 at an appropriate height, and the remaining part is the funnel casing 12. It is assembled to the bottom portion 19 so as to protrude outward from the bottom portion 19, and is connected to the drain pipe 4 through the outward protruding portion from the bottom portion 19. Further, the communication tube 13 is provided with an annular hermetic seal body 21 at the protruding portion into the funnel casing 12 so as to cover the leading edge. The hermetic seal body 21 is formed to have appropriate elasticity by using an elastic material such as a rubber material.

  The float 14 has a diameter that is, for example, about half the width of the funnel casing 12 and has an apparent specific gravity smaller than 1. The float 14 is formed by drainage (floor drainage or backflow drainage) that flows into the funnel casing 12. It is arranged in the funnel casing 12 so that it can float.

  The backflow prevention seal body 15 includes a main body portion 22 and a lip portion 23 that are integrally formed so as to have appropriate elasticity by using an elastic material such as a rubber material. The main body portion 22 is formed in a short cylindrical shape, and the inside thereof becomes an inflow hole 24. The lip portion 23 has an annular inner tapered surface 25 that extends downwardly in a state where the lip portion 23 is connected to the lower edge portion of the inflow hole 24, and has an outer tapered surface 26 that faces the inner tapered surface 25. It is extended from. The backflow prevention seal body 15 is assembled to the inflow opening 17 so that the inflow hole 24 becomes an inflow path of the floor drainage W when the floor drainage W flows into the funnel casing 12 through the inflow opening 17. Yes. More specifically, the backflow prevention seal body 15 is assembled to a closing plate 27 formed in accordance with the shape of the inflow opening 17, and is assembled to the inflow opening 17 through the closing plate 27. That is, the closing plate 27 closes the inflow opening 17 around the backflow prevention seal body 15 so that only the inflow hole 24 becomes an inflow path of the floor drainage W to the funnel casing 12. Note that the screw plate 28 is formed on the side surface of the closing plate 27 and is screwed together by the screw portion 28 to be assembled to the inflow opening 17. By screwing in this way, the closing plate 27 can be easily removed when inspecting the inside of the funnel casing 12.

  Here, the shape of the lip portion 23 as described above is such that the inner tapered surface 25 is brought into contact with the float 14 while the outer tapered surface 26 receives the water pressure due to the backflow water filled in the funnel casing 12 as will be described later. belongs to. Therefore, the shape is not limited to this example as long as it can satisfy such functionality.

  The protective lid 16 is formed in a flat lattice structure that allows passage of the floor drainage W, and is covered with the funnel casing 12 so as to cover and protect the inflow opening 17 in which the backflow prevention seal body 15 is assembled. ing.

  In the floor drain funnel 11 as described above, a float type trap structure is formed by the float 14, the backflow prevention seal body 15 of the inflow opening 17, and the airtight seal body 21 of the connecting pipe 13, thereby preventing backflow and airtightness. Is given sex. Below, operation | movement of the float type trap structure in such a floor drain funnel 11 is demonstrated.

  FIG. 2 shows a state where floor drainage does not flow into the funnel casing 12. In this state, the float 14 is in contact with the communication pipe 13 through the airtight seal body 21 by its own weight. The contact between the float 14 and the airtight seal body 21 is performed in a state where the airtight seal body 21 is in close contact with the end edge of the annular airtight seal body 21, and the airtight seal body 21 is elastic to the float 14 due to its elasticity. It is made to come into contact. For this reason, a high close state can be obtained between the float 14 and the airtight seal body 21. Therefore, the communication pipe 13 can be sealed with high accuracy with respect to the funnel casing 12 side, and the funnel casing 12 can be hermetically sealed with respect to the drain pipe 4 with high precision.

  FIG. 3 shows a state where the floor drainage W flows into the funnel casing 12. When the floor drainage W flows into the funnel casing 12, the float 14 floats by the floor drainage W and leaves the hermetic seal body 21. As a result, the connecting pipe 13 communicates with the funnel casing 12, and the floor drainage W flows down to the drainage pipe 4 through the connecting pipe 13. In this way, when the floor drainage W passes through the funnel casing 12, the floor drainage W maintains a constant water level in the funnel casing 12. The float 14 floats to the extent corresponding to the water level of the floor drainage W, and is kept away from the airtight seal body 21 but does not come into contact with the backflow prevention seal body 15.

  FIG. 4 shows a state in which drainage flows into the funnel casing 12 from the drainage pipe 4 to generate a backflow. When the backflow water R flows into the funnel casing 12, the float 14 floats by the backflow water R, and the float 14 contacts the backflow prevention seal body 15 while receiving the buoyancy and water pressure by the backflow water R to seal the inflow hole 24. . As a result, the backflow water R that has flowed into the funnel casing 12 can be prevented from flowing out to the floor 2, and thus backflow can be effectively prevented. In such a backflow prevention function, the abutment between the float 14 that floats in the backflow water R and the backflow prevention seal body 15 has a lip portion 23 via an inner taper surface 25 as shown partially enlarged in FIG. In addition, the lip portion 23 is made to receive the water pressure due to the backflow water acting in the state shown by the block arrow in FIG. Therefore, a highly stable close state can be obtained between the float 14 and the backflow prevention seal body 15. Therefore, the inflow hole 24 can be sealed with high accuracy with respect to the funnel casing 12 side, thereby reliably preventing the backflow water R from flowing out from the funnel casing 12 to the floor 2 and highly accurate backflow prevention function. Can be demonstrated.

  FIG. 6 shows the configuration of the floor drain funnel 31 according to the second embodiment in a simplified manner with respect to the longitudinal sectional state. The floor drain funnel 31 in this embodiment includes a funnel casing 12, a connecting pipe 13, a funnel lid 32, a blocking film body 33, and an airtight seal crown 34. Here, the funnel casing 12 and the connecting pipe 13 are basically the same as those in the floor drain funnel 11 of the first embodiment. Therefore, the funnel casing 12 and the connecting pipe 13 are denoted by the same reference numerals as in FIG. 1 and the above description is incorporated.

  The funnel lid 32 is formed in a flat plate shape that matches the shape of the inflow opening 17 of the funnel casing 12, and has a structure partially including the inflow portion 35. More specifically, the structure is provided with an inflow portion 35 that allows the inflow of floor drainage W by forming a plurality of small inflow holes 37 in the peripheral portion of the center portion as a non-inflow portion 36 and the periphery thereof. Has been. Further, the funnel lid 32 is formed with a threaded portion 38 on a side surface, and is assembled to the inflow opening 17 by being screwed by the threaded portion 38.

  The blocking film body 33 is formed as a flat film body having an appropriate thickness using an elastic material having an appropriate elasticity such as a rubber material, and the outer periphery thereof has a shape that substantially matches the outer periphery of the funnel lid 32. The film opening 41 is provided at the center. The membrane opening 41 is provided with a float ring 42 formed on the peripheral edge so that the apparent specific gravity is smaller than 1. Further, the blocking film body 33 is fixedly attached to the peripheral portion of the funnel lid 32 through the peripheral portion, and in the initial state, the portion other than the fixed peripheral portion is bent downward by its own weight or the weight of the float ring 42. The state is separated from the funnel lid 32.

  The hermetic seal crown 34 is formed in a box shape with an open bottom, and a communication opening 43 is provided on a side surface on the open bottom side. The hermetic seal crown 34 functions to form a general siphon-type trap structure with high hermeticity between the funnel casing 12 and the connecting pipe 13. In other words, the airtight seal crown 34 is installed on the funnel casing 12 so as to cover the protruding portion of the communication pipe 13 into the funnel casing 12 at a distance, while keeping the open bottom portion in close contact with the bottom portion 19 of the funnel casing 12. Yes. Then, a siphon-like structure is formed between the funnel casing 12 and the connecting pipe 13 depending on the installation state, and a siphon type trap structure is formed by the staying water S staying there. The siphon type trap structure formed by the airtight seal crown 34 in this way functions to seal the connecting pipe 13 against the funnel casing 12 side, so that the funnel casing 12 becomes airtight with respect to the drain pipe 4. Is done.

  In the floor drain funnel 31 as described above, the backflow is prevented by the funnel lid 32 and the blocking film body 33. Below, the backflow prevention operation | movement in such a floor drainage funnel 31 is demonstrated.

  FIG. 6 shows a state where floor drainage does not flow into the funnel casing 12. In this state, the blocking film body 33 is in the above-described initial state, and the inflow hole 37 in the inflow portion 35 of the funnel cover 32 and the film opening 41 of the blocking film body 33 are separated from the funnel cover 32 in the initial state. It is possible for the floor drainage W to flow into the funnel casing 12 via.

  A state where the floor drainage W flows into the funnel casing 12 is shown in FIG. When floor drainage W is generated in the floor 2 and flows into the funnel casing 12 from the inflow hole 37 through the membrane opening 41, the water level of the retained water S in the siphon type trap structure by the airtight seal crown 34 rises and communicates. Over the upper end of the pipe 13, the floor drainage W flows down to the drainage pipe 4 through the connecting pipe 13 in this state.

  FIG. 8 shows a state in which wastewater flows into the funnel casing 12 from the drainage pipe 4 to generate a backflow. When the backflow water R flows into the funnel casing 12, the backflow water R acts on the whole of the blocking film body 33 and the float ring 42 to push up the blocking film body 33. Then, the pushed-up blocking membrane 33 sticks to the funnel lid 32 so that the membrane opening 41 is brought into close contact with the non-inflow portion 36 while receiving the water pressure and buoyancy of the backflow water R. As a result, the membrane opening 41 is sealed by the non-inflow portion 36 of the funnel lid 32, and the inflow hole 37 in the inflow portion 35 of the funnel lid 32 is blocked from the backflow water R. Therefore, it is possible to reliably prevent the backflow from occurring.

  FIG. 9 shows a simplified configuration of the floor drain funnel 51 according to the third embodiment in terms of a longitudinal section. The floor drain funnel 51 in the present embodiment is basically the same as the floor drain funnel 31 in the second embodiment, and is different in the blocking film body 52. Hereinafter, a characteristic configuration of the floor drain funnel 51 will be described, and the other configurations will be denoted by the same reference numerals as in FIG. 6, and the above description will be used.

  Similarly to the blocking film body 33, the blocking film body 52 is formed as a flat film body having an appropriate thickness using an elastic material having an appropriate elasticity such as a rubber material, and the outer periphery thereof is formed as a funnel lid. The shape is substantially adapted to the outer periphery of 32, and a film opening 53 is provided in the center. Further, the blocking film body 52 is fixedly attached to the peripheral portion of the funnel lid 32 via the peripheral portion, so that the whole is attached to the funnel lid 32 in the initial state. Therefore, in the initial state, the blocking film body 52 has the film opening 53 sealed by the non-inflow portion 36 of the funnel lid 32, and the inflow hole 37 in the inflow portion 35 of the funnel lid 32 is blocked by a portion other than the membrane opening 53. In this state, the funnel casing 12 is shut off.

  In the floor drain funnel 51 as described above, the backflow is prevented by the funnel lid 32 and the blocking film body 52. Below, the backflow prevention operation | movement in such a floor drainage funnel 51 is demonstrated.

  FIG. 9 shows a state where floor drainage does not flow into the funnel casing 12. In this state, the blocking film body 52 is in the above-described initial state and is stuck to the funnel lid 32.

  FIG. 10 shows a state where the floor drainage W flows into the funnel casing 12. When the floor drainage W is generated in the floor 2 and tries to flow into the funnel casing 12 from the inflow hole 37, the barrier film body 52 receives a pressure of the floor drainage W and the blocking film body 52 is fixed to the funnel lid 32. The part is separated from the funnel lid 32 by bending downward. The separated state allows the floor drainage W to flow into the funnel casing 12 through the inflow hole 37 in the inflow portion 35 of the funnel lid 32 and the membrane opening 53 of the blocking film body 52, and the floor drainage into the funnel casing 12. When W flows in, the water level of the stagnant water S in the siphon-type trap structure by the airtight seal crown 34 rises and exceeds the upper end of the connecting pipe 13, and in this state, the floor drainage W flows down to the drain pipe 4 through the connecting pipe 13. It becomes like this.

  FIG. 11 shows a state in which wastewater flows into the funnel casing 12 from the drainage pipe 4 to generate a backflow. When the backflow water R flows into the funnel casing 12, the backflow water R reaches a state of filling the funnel casing 12, but the blocking film in the initial state is generated by the water pressure as indicated by the block arrow shown in the figure by the backflow water R in that state. When the body 52 is pushed up, the sticking state of the blocking film body 52 to the funnel lid 32 is promoted. As a result, the state of the blocking membrane body 52 in the initial state, that is, the membrane opening 53 is sealed by the non-inflow portion 36 of the funnel lid 32, and the inflow hole 37 in the inflow portion 35 of the funnel lid 32 is made with respect to the funnel casing 12 side. Thus, the state in which the inflow hole 37 is blocked from the backflow water R becomes stronger. And by this, it can prevent reliably that the backflow water R flows out to the floor 2, Therefore Therefore, a backflow can be prevented effectively.

  As mentioned above, although the form for implementing this invention was demonstrated, these are only representative examples, This invention can be implemented with various forms in the range which does not deviate from the meaning.

2 Floor 3, 11, 31, 51 Floor drainage funnel 4 Drainage pipe 12 Funnel casing 13 Connecting pipe 14 Float 15 Backflow prevention seal body 17 Inflow opening 19 Bottom 23 Lip part 24 Inflow hole 32 Funnel lid 33 Insulation film body 35 Inflow part 37 Inflow hole 41 Membrane opening R Backflow water W Floor drainage

Claims (3)

A funnel casing embedded in the floor so that drainage flowing through the floor in the building can flow in through the inflow opening, and a connecting pipe assembled at the bottom of the funnel casing. A floor drainage funnel adapted to cause the floor drainage flowing from the inflow opening to flow out to the drainage pipe of the wastewater treatment system by the connecting pipe,
A plurality of inflow holes are formed so as to partially have an inflow portion adapted to allow inflow of drainage from the floor, and a funnel cover disposed in the inflow opening portion and a membrane opening portion are provided. And when the drainage flows backward from the drainage pipe to the funnel casing through the connecting pipe, while receiving buoyancy and water pressure due to the backflow water, other than the membrane opening of the barrier membrane A floor drainage funnel characterized in that a portion of the inflow portion sticks to the inflow portion of the funnel lid so that the inflow holes of the inflow portion are blocked from backflow water from the drainage pipe. .   The state in which the blocking film body is separated from the funnel cover is set as an initial state, and the separated state allows drainage from the floor to flow into the funnel casing through the film opening. On the other hand, when drainage flows back from the drainage pipe to the funnel casing via the connecting pipe, the blocking film body is pushed up by the backflow water so that the blocking film body sticks to the funnel lid. The floor drain funnel according to claim 1, wherein the floor drain funnel is formed.   The state in which the barrier film body sticks to the funnel lid is set as an initial state, and the barrier film body is separated from the funnel lid by the drainage to flow in from the floor. While drainage from the floor can flow into the funnel casing through the opening, when drainage flows back from the drainage pipe to the funnel casing through the connecting pipe, The floor drainage funnel according to claim 1, wherein the barrier film body is pushed up to promote a state in which the barrier film body sticks to the funnel lid.

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