JP6301190B2 - Float type check valve - Google Patents

Description

  The present invention relates to a float-type backflow prevention valve disposed in a drainage system that discharges wastewater generated in a site such as a factory or in a building to a river, the sea, a public drainage facility, or the like.

  Conventionally, in the drainage system that discharges wastewater generated in the premises of factories and buildings to rivers, seas, public drainage facilities, etc., a float type that prevents backflow to drain in the forward direction from upstream to downstream A backflow prevention valve is provided (see, for example, Patent Document 1).

  In general, the float type check valve includes an annular valve seat that communicates the upstream side and the downstream side of the drainage system, a float that is positioned below the annular valve seat, and a plurality of guide members that guide the float vertically. A single valve unit. The float floats and descends with the level of the drainage to open and close the annular valve seat. Since the water level is low in normal times (normal time), the float descends and is placed (landed) on the bottom plate below the annular valve seat, and the annular valve seat is opened. Therefore, drainage is performed in the forward direction from the upstream to the downstream through the annular valve seat. On the other hand, the water level rises at the time of reverse flow, so that the float is floated and the annular valve seat is closed. As a result, backflow upstream from the annular valve seat is prevented.

Japanese Utility Model Publication No. 6-67588

  As described above, normally, the wastewater flows downstream from the upstream through the annular valve seat. Along with this movement of the drainage, a difference in atmospheric pressure occurs between the upstream side and the downstream side, and the air accumulated on the downstream side passes through the annular valve seat and rises upstream. However, this movement of air prevents the forward flow of drainage in the annular valve seat.

  An object of the present invention is to provide a float type backflow prevention valve that improves the drainage capacity of a drainage system by suppressing the movement of air upstream to prevent the flow of drainage while maintaining the backflow prevention function.

  The float type check valve provided in the drainage system for draining from upstream to downstream provided by the present invention includes a first valve unit, an opening, and a second valve unit. The first valve unit opens in the vertical direction, and is positioned so as to be movable in the vertical direction on the first annular valve seat that communicates the upstream side and the downstream side of the drainage system and the downstream side below the first annular valve seat. As the water level rises, the first annular valve seat is closed by fitting the opening and closing the opening to close the opening, and lowering the water level and lowering the opening. A first float for opening the first annular valve seat, a first guide member for guiding the vertical movement of the first float, and a first defining member for defining a lower limit position of the movement of the first float. Have. The opening is positioned above the first annular valve seat and communicates the upstream side and the downstream side of the drainage system. The second valve unit has an opening / closing mechanism that closes the opening during reverse flow.

  The second valve unit is a second annular valve seat that opens in the vertical direction, and is positioned so as to be movable in the vertical direction on the downstream side below the second annular valve seat, and floats as the water level rises, The second annular valve seat is closed by fitting the opening of the second annular valve seat and closing the opening, and then closing the second annular valve seat by lowering the water level of the drainage to release the opening. A second float for opening the seat; a second guide member for guiding the vertical movement of the second float; and the opening / closing mechanism having a second defining member for defining a lower limit position of the movement of the second float. May be.

  A plurality of openings may be provided, and the same number of the second valve units may be provided as the openings, and each of the plurality of openings may be closed during backflow.

  According to this invention, in addition to the first valve unit, the second valve unit having an opening located above the first annular valve seat is disposed, so that the first annular valve seat is drained from the upstream side. When passing through and downstream, the downstream air moves mainly from the opening to the upstream side. That is, the opening functions as an air passage. Therefore, it can suppress that the passage of the waste_water | drain in a 1st valve unit is prevented by the movement of air. In addition, since the second valve unit closes the opening during backflow, the drainage capacity of the drainage system can be improved while maintaining the backflow prevention function.

It is sectional drawing of the backflow prevention valve which concerns on Example 1 of this invention. (A) is the figure which looked at the state which attached the annular valve seat and the valve-seat retainer to the main body of the backflow prevention valve from the downstream, (B) is the figure which expanded a part of (A). It is a top view of the baseplate of the valve unit of a backflow prevention valve. It is an enlarged view of the broken-line part shown in FIG. It is an expanded sectional view of 1 valve unit of the backflow prevention valve concerning Example 2 of this invention. It is sectional drawing of the backflow prevention valve which concerns on Example 3 of this invention. It is sectional drawing of the backflow prevention valve which concerns on Example 4 of this invention. It is sectional drawing of the backflow prevention valve which concerns on Example 5 of this invention. It is sectional drawing of the backflow prevention valve which concerns on Example 6 of this invention. It is sectional drawing of the backflow prevention valve which concerns on Example 7 of this invention.

  A float type check valve (hereinafter referred to as a check valve) according to an embodiment of the present invention will be described with reference to the drawings. The configuration of the present invention is not limited to the form of each embodiment.

  FIG. 1 is a cross-sectional view of a check valve 1 according to an embodiment of the present invention. FIG. 2A is a view of the state where the annular valve seat 6A and the valve seat retainer 14A are attached to the main body 5 of the check valve 1, as viewed from the downstream side, and FIG. It is the figure which expanded a part of. 3 is a plan view of the bottom plate 8A of the valve unit 20A of the check valve 1, and FIG. 4 is an enlarged view of a broken line portion shown in FIG.

  As shown in FIG. 1, the backflow prevention valve 1 of this embodiment is disposed in a drainage system that discharges wastewater generated on a floor surface 2 of a building to a river or the sea. To prevent backflow. The drainage system includes a recess H formed on the floor surface 2, a drain pipe 3 extending downward from the bottom surface of the recess H, and the like. The backflow prevention valve 1 is disposed at the upper end of the drain pipe 3. Drainage generated on the floor surface flows from the upstream side (floor surface 2) through the backflow prevention valve 1 (communication opening 60A) to the downstream side (drainage pipe 3).

  The backflow prevention valve 1 includes a main body 5, two valve units 20A and 20B, a pressure equalizing passage 30B, and the like. The main body 5 has a substantially cylindrical shape, and has an upstream port 11A having a circular cross section penetrating in the vertical direction. A fixture 10 is screwed to the outer periphery of the upper portion of the main body 5. The fixture 10 is fixedly supported on the floor 2 by welding 4. The valve unit 20A (first valve unit) is disposed below the upstream port 11A, and the valve unit 20B (second valve unit) is disposed at the upper end of the pressure equalizing passage 30B.

  The pressure equalizing passage 30 </ b> B has a cylindrical shape with an upper end and a lower end opened, and is inserted into the through hole 51 of the main body 5. The pressure equalizing passage 30 </ b> B has a male screw (not shown) on a part of the outer periphery, and is screwed to a female screw (not shown) formed on a part of the inner periphery of the through hole 51 of the main body 5. Thereby, the pressure equalizing passage 30 </ b> B is fixedly supported by the main body 5. The pressure equalizing passage 30 </ b> B communicates with the upstream side and the downstream side, and when the drainage flows through the valve unit 20 </ b> A (communication opening 60 </ b> A) and flows downstream, the air accumulated in the drain pipe 3 is upstream (floor surface). It functions as an escape route for air to the second side. That is, the upstream and downstream air pressures are made uniform.

  The valve unit 20A is disposed inside the annular valve seat 6A attached to the main body 5 and the four guide rods 7A, the bottom plate 8A attached to the guide rod 7A, and the annular valve seat 6A, the guide rod 7A and the bottom plate 8A. The float 9A and the like are provided. The valve unit 20A prevents water from flowing back to the upstream side by closing the annular valve seat 6A.

  The annular valve seat 6A is made of rubber, for example, and has a communication opening 60A in the center. The annular valve seat 6A is pressed and fixed to the lower end of the main body 5 via a valve seat retainer 14A (see FIG. 2B). The annular valve seat 6A communicates the upstream port 11A and the drainage pipe 3 via the communication opening 60A. The valve seat retainer 14A has an annular structure as shown in FIG. The valve seat retainer 14A has a small screw hole 12A for inserting a small screw 13A (see FIG. 1) for fixing the annular valve seat 6A, and a screw hole 15A for inserting the guide rod 7A. As shown in FIG. 1, the valve seat retainer 14A is fixed to the main body 5 with a machine screw 13A.

  The four guide rods 7 </ b> A are made of metal such as stainless steel, and their upper ends are screw-coupled to screw holes 15 </ b> A provided at equal intervals on the lower end of the main body 5, and are fixedly supported by the main body 5. These four guide rods 7A guide the float 9A in the vertical direction. Note that it is sufficient that at least three guide rods 7A are provided.

  Further, the lower end portion of the guide bar 7A is screw-coupled to the nut 17A while passing through the guide bar hole 16A (see FIG. 3) of the bottom plate 8A, and supports the bottom plate 8A so that the plate surface is horizontal. The bottom plate 8A is positioned below the float 9A and defines a lower limit position for movement of the float 9A. Further, the bottom plate 8A has four through holes 18A for allowing drainage to pass therethrough. Note that the plate surface of the bottom plate 8A does not need to be horizontally supported precisely and may be substantially horizontal.

  As shown in FIG. 1, the float 9A is formed of a metal such as stainless steel and has a hollow spherical shape. In addition, since the float 9A has a lighter specific gravity than the drainage, the float 9A floats due to a rise in the water level in the drainage pipe 3 at the time of backflow in which water flows from the downstream side to the upstream side, and a part of the annular valve seat 6A When fitted to the communication opening 60A, the annular valve seat 6A is closed, and then lowered due to a drop in the water level, and when the engagement does not fit with the communication opening 60A of the annular valve seat 6A, the annular valve seat 6A is opened. The float 9A does not have to be a precise spherical shape, and may be a substantially spherical shape that can close the annular valve seat 6A.

  As shown in FIG. 4, the valve unit 20B includes a main body 70B, an annular valve seat 6B attached to the main body 70B, four guide rods 7B, a bottom plate 8B attached to the guide rod 7B, an annular valve seat 6B and a guide rod. The float 9B etc. which are arrange | positioned inside 7B and the baseplate 8B are provided. The valve unit 20B prevents water from flowing backward from the pressure equalizing passage 30B to the upstream side (the floor surface 2 side) by closing the annular valve seat 6B by the float 9B.

  The main body 70B has a substantially cylindrical shape, and has an upstream port 11B having a circular cross section penetrating in the vertical direction. The main body 70B has a male screw 71B on a part of the outer periphery. The male screw 71B is screwed to a female screw 32B formed on a part of the inner circumference of the pressure equalizing passage 30B, so that the valve unit 20B is attached to the pressure equalizing passage 30B. The annular valve seat 6B is similar in configuration to the annular valve seat 6A, but is pressed and fixed to the lower end of the main body 70B via the valve seat retainer 14B, and equalized with the upstream port 11B via the communication opening 60B. It communicates with the passage 30. The other configuration of the valve unit 20B is the same as that of the valve unit 20A although the size is different. In this embodiment, the lower end of the pressure equalizing passage 30B to the upper end of the main body 70B correspond to the opening of the present invention.

  In normal times, the water level in the drain pipe 3 is generally lower than the position where the bottom plates 8A and 8B are arranged, so that the floats 9A and 9B are lowered by their own weight and placed on the bottom plates 8A and 8B (landed). ) And the annular valve seats 6A and 6B are opened. As a result, drainage flows from the floor surface 2 (upstream side) to the upstream port 11A, the communication opening 60A of the annular valve seat 6A, between the guide rods 7A and the through hole 18A to the downstream port 19 (downstream side). Discharged into rivers. Further, when the drainage occurs in this way, the air accumulated in the drainage pipe 3 mainly flows from the pressure equalizing passage 30 through the communication opening 60B of the annular valve seat 6B to the upstream port 11B and flows to the floor surface 2 (upstream side). Move to. Therefore, the air pressure on the upstream side and the downstream side is kept uniform. Thereby, when drainage passes from the communication opening 60A to the downstream port 19 (downstream side), it is possible to prevent air from passing from the communication opening 60A to the floor surface 2 (upstream side).

  Since the upper end of the pressure equalizing passage 30B is higher than the floor surface 2, the drainage generated on the floor surface 2 is difficult to flow in. Further, it is desirable that the pressure equalizing passage 30B has a lower end above the annular valve seat 6A. This is because if it is lower than the annular valve seat 6A, the air is more likely to flow through the communication opening 60A than the pressure equalizing passage 30B.

  On the other hand, when the water flows backward from the downstream side, the water level in the drainage pipe 3 rises from the downstream side toward the annular valve seats 6A and 6B. Ascend by buoyancy in the state. And if a water level rises further, float 9A, 9B will be in the state which plugs annular valve seat 6A, 6B. This reliably prevents water from flowing back upstream from the annular valve seats 6A and 6B and overflowing to the floor surface 2 and the like.

  As described above, in addition to the valve unit 20A, the valve unit 20B having an opening located above the annular valve seat 6A (communication opening 60A) is disposed, so that the drainage flows from the upstream side to the annular valve seat 6A. When passing through the (communication opening 60A) and flowing downstream, the downstream air mainly moves from the opening to the upstream side. Therefore, it can suppress that passage of the waste_water | drain in the valve unit 20A is prevented by the movement of air. Moreover, since the valve unit 20B closes the opening during backflow, the drainage capacity of the drainage system can be improved while maintaining the backflow prevention function.

  The floats 9A and 9B and the bottom plates 8A and 8B in this embodiment are desirably made of metal in order to prevent mutual sticking. Since the backflow itself does not occur frequently, the floats 9A and 9B are basically in a state of being placed (landed) on the bottom plates 8A and 8B. It is because it is easy to adhere to 8A and 8B.

  In this embodiment, the valve unit 20B is smaller in size than the valve unit 20A, but the same size may be used.

  This embodiment is different from the first embodiment in the configuration of the closing mechanism of one of the two valve units. This different configuration will be described with reference to FIG. Since other configurations are the same as those of the first embodiment, description thereof is omitted.

  FIG. 5 is an enlarged cross-sectional view of one valve unit 200B of the check valve 100 according to the embodiment of the present invention. FIG. 5 shows a state in which the valve unit 200B is disposed in the pressure equalizing passage 30B. The valve unit 200B is disposed at the upper end of the pressure equalizing passage 30B as in the first embodiment. The valve unit 200B includes a main body 700B, an annular valve seat 6B attached to the main body 700B, a valve seat retainer 140B, a valve body 90B, an arm 91B, a pin 92B, and the like. The main body 700 </ b> B has a male screw 710 </ b> B at a part of the outer periphery, as in the first embodiment. The male screw 710B is screwed to a female screw 32B formed on a part of the inner periphery of the pressure equalizing passage 30B, so that the valve unit 200B is attached to the pressure equalizing passage 30B. Similar to the first embodiment, the annular valve seat 6B is pressed and fixed to the lower end of the main body 700B by a valve seat retainer 140B using a small screw 13B. The valve body 90B opens and closes the communication opening 60B of the annular valve seat 6B by the arcuate movement of the supported arm 91B. The arm 91B performs an arcuate motion with the pin 92B as a fulcrum. The opening / closing mechanism using the above-described valve body 90B or the like is a general swing check valve opening / closing mechanism, and thus detailed description thereof is omitted.

  In normal times, the water level in the drain pipe 3 is generally lower than the arrangement position of the valve body 90B. Therefore, the valve body 90B is in the state lowered to the position shown in FIG. 5 due to its own weight, and the annular valve seat 6B is opened. Thereby, when drainage occurs, the air accumulated in the drain pipe 3 mainly flows from the pressure equalizing passage 30 through the communication opening 60B of the annular valve seat 6B to the upstream port 11B and moves to the floor surface 2 (upstream side). To do.

  On the other hand, at the time of backflow of water from the downstream side, the water level in the drain pipe 3 rises from the downstream side toward the annular valve seat 6B, so that the valve body 90B rises due to the backflow pressure. And the valve body 90B will be in the state which plugs the annular valve seat 6B.

  As described above, the valve unit is not limited to the structure of the closing mechanism using the float, and may be any structure as long as it is a closing mechanism for closing the opening.

  This embodiment differs from the first embodiment in the configuration including the third valve unit. This different configuration will be described with reference to FIG. Since other configurations are the same as those of the first embodiment, description thereof is omitted.

  FIG. 6 is a cross-sectional view of the backflow prevention valve 110 according to the embodiment of the present invention. The backflow prevention valve 110 of this embodiment includes a total of three valve units 20A to 20C. The valve unit 20A and the valve unit 20B have the same configuration as that of the first embodiment. Further, the valve unit 20C has the same configuration as the valve unit 20B and functions as an air escape path. In the main body 500, the valve unit 20C is disposed at a position facing the valve unit 20B across the valve unit 20A.

When drainage occurs during normal times, also in the valve unit 20C, as in the valve unit 20B, air accumulated in the drainage pipe 3 communicates from the pressure equalizing passage 30C to the annular valve seat 6C (not shown in FIG. 6). And move to the floor 2 (upstream side). The annular valve seat 6C of the valve unit 20C is a component similar to the annular valve seat 6B of the valve unit 20B (see FIG. 4). On the other hand, when water flows backward from the downstream side, the float of the valve unit 20C closes the annular valve seat 6C in the same manner as the valve unit 20B.
As described above, there may be a plurality of valve units for allowing air to pass therethrough. In this embodiment, the total area of the communication openings of the annular valve seats of the valve units 20B and 20C is equal to the area of the communication opening of the annular valve seat 6A of the valve unit 20A. Thus, if it is more than the area of the communicating opening of 6 A of annular valve seats, air will move more easily to the upstream side at the time of drainage.

  This embodiment differs from the first embodiment in a configuration in which no pressure equalizing passage is provided. This different configuration will be described with reference to FIG. Since other configurations are the same as those of the first embodiment, description thereof is omitted.

  FIG. 7 is a cross-sectional view of the backflow prevention valve 120 according to the embodiment of the present invention. The valve unit 20 </ b> B of the backflow prevention valve 120 is disposed in a through hole 510 formed in the main body 501. The through hole 510 communicates the upstream side (floor surface 2) and the downstream side (drainage pipe 3), and has a female screw (not shown) at a part of the inner periphery. The valve unit 20B has the same configuration as that of the first embodiment, but the main body 70B is attached to the through hole 510 of the main body 501 instead of the pressure equalizing passage. In the main body 70 </ b> B, a male screw formed on a part of the outer periphery is screw-coupled with a female screw formed on a part of the inner periphery of the through hole 510. Further, the annular valve seat 6 </ b> B of the valve unit 20 </ b> B is positioned below the lower end of the through hole 510. Therefore, in this embodiment, the range from the annular valve seat 6B to the upper end of the through hole 510 corresponds to the opening of the present invention.

  Also in this embodiment, since the opening is located above the annular valve seat 6A of the valve unit 20A, the same effects as those of the first embodiment can be obtained. In this embodiment, there is a possibility that drainage generated on the floor surface 2 flows into the through hole 510B and passes through the valve unit 20B. However, since most of the air accumulated in the drainage pipe 3 still passes through the valve unit 20B and moves to the upstream side, the drainage flowing into the through hole 510 is blocked by the movement of the air, but the upstream port 11A. As for the waste water flowing in from the first embodiment, the same effect as in the first embodiment can be obtained.

  This embodiment differs from the first embodiment in the configuration in which the backflow prevention valve is provided between the two drain pipes. This different configuration will be described with reference to FIG. Since other configurations are the same as those of the first embodiment, description thereof is omitted.

  FIG. 8 is a sectional view of the check valve 130 according to the embodiment of the present invention. The main body 502 of the backflow prevention valve 130 has a male screw 512 at a part of the outer periphery. The male screw 512 is screwed to the female screw 310 formed on a part of the inner periphery of the drain pipe 300, so that the backflow prevention valve 130 is attached to the drain pipe 300. Further, an upstream drain pipe (not shown) is connected to the upper end of the main body 502 by screw coupling in the same manner as the drain pipe 300. The valve units 20 </ b> A and 20 </ b> B have the same configuration as that of the first embodiment and are disposed in the main body 502.

  This embodiment differs from the first embodiment in the configuration in which the backflow prevention valve is provided between the two drain pipes. Moreover, it differs from Example 5 in the structure by which a backflow prevention valve is provided between two drainage pipes using a fixture. This different configuration will be described with reference to FIG. Since other configurations are the same as those of the second embodiment, description thereof is omitted.

  FIG. 9 is a cross-sectional view of the check valve 140 according to the embodiment of the present invention. The main body 503 of the backflow prevention valve 140 has an upper end outer periphery protruding from the drain pipe 301 and is screwed to the fixture 400. The fixture 400 has a substantially cylindrical shape, and a female screw 410 provided on a part of the inner periphery is screwed to a male screw 311 provided on the outer periphery of the end of the drain pipe 301. As a result, the backflow prevention valve 140 is attached to the drain pipe 301 via the fixture 400. Further, an upstream drain pipe (not shown) is screwed to the upper end of the fixture 400 so as to be fitted on the fixture 400. The valve units 20 </ b> A and 20 </ b> B have the same configuration as that of the first embodiment and are disposed in the main body 503.

  This embodiment differs from the first embodiment in the configuration in which the backflow prevention valve is provided between the two drain pipes. Moreover, in the structure by which a backflow prevention valve is provided between two drain pipes using a flange, it differs from Example 5 and Example 6. FIG. This different configuration will be described with reference to FIG. Since other configurations are the same as those of the second embodiment, description thereof is omitted.

  FIG. 10 is a cross-sectional view of the check valve 150 according to the embodiment of the present invention. The main body 504 of the backflow prevention valve 150 has a flange 520 at the upper end. The flange 520 is fixed to the flange 320 provided on the outer periphery of the end portion of the drain pipe 302 with the bolt 450, so that the backflow prevention valve 150 is attached to the drain pipe 302. Further, an upstream drain pipe (not shown) is fixed to the flange 520 at the upper end of the main body 504 in the same manner as the drain pipe 302. The valve units 20 </ b> A and 20 </ b> B have the same configuration as that of the first embodiment and are disposed in the main body 504.

[Other Examples]
The arrangement position of the valve unit through which air passes, such as the valve unit 20B described above, is not limited to the above-described embodiment, as long as the opening can be opened and closed.

  In the above-described embodiment, the guide rod is used as the guide member. However, the guide rod is not particularly limited as long as the float is guided in the vertical direction. For example, a coil spring having an inner diameter larger than the float diameter may be used. In this case, the coil spring includes the float and guides the vertical movement of the float.

  Furthermore, in the above-described embodiment, the bottom plate is used as the defining member that defines the lower limit position of the float. However, the bottom plate is not particularly limited as long as the lower limit position can be defined. For example, a bowl-shaped defining member having a recess where the float lands may be used.

  This invention discharges wastewater generated in the grounds and buildings of factories to rivers, seas, public drainage facilities, etc., and drains water used in public baths, etc. It can be used in the industrial field where construction, sales and operation of drainage drainage systems are performed.

1, 100, 110, 120, 130, 140, 150 Float backflow prevention valve 5, 500, 501, 502, 503, 504 Main body 6A, 6B Annular valve seat 7A, 7B Guide rod (guide member)
8A, 8B Bottom plate (regulating member)
9A, 9B Float 20A, 20B, 200B, 210B Valve unit 30B, 30C Equal pressure passage 51, 510 Through hole

Claims (3)

A float type backflow prevention valve disposed in a drainage system that drains from upstream to downstream,
A first annular valve seat that opens in the vertical direction and communicates the upstream side and the downstream side of the drainage system;
The first annular valve seat is located on the downstream side below the first annular valve seat so as to be movable in the vertical direction, floats as the water level rises, fits into the opening, and closes the opening. A first float that opens the first annular valve seat by lowering and releasing the opening as the water level of the drainage drops,
A first guide member for guiding the vertical movement of the first float;
A first defining member for defining a lower limit position of movement of the first float;
A first valve unit having
An opening located above the first annular valve seat and communicating between the upstream side and the downstream side of the drainage system;
The opening is provided at a position above the first annular valve seat in the opening, and has a second annular valve seat that opens in the vertical direction, and the opening is made by closing the second annular valve seat during backflow. a second valve unit you stoppered,
Float type check valve with The second valve unit,
It located movably in the vertical direction in front Symbol downstream side of the second annular valve seat downwardly, emerged with the water level rising in the drainage, to close the opening fitted to the opening of the second annular valve seat A second float for closing the second annular valve seat and opening the second annular valve seat by lowering as the water level of the drainage drops and releasing the opening;
A second guide member for guiding the vertical movement of the second float;
A second defining member for defining a lower limit position of the movement of the second float;
Float type check valve according to 請 Motomeko 1 that have a. A plurality of the openings are disposed,
The float type backflow prevention valve according to claim 1 or 2, wherein the second valve unit is arranged in the same number as the opening and closes each of the plurality of openings during backflow.

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