JP2023162477A - Float-type check valve - Google Patents

Abstract

To provide a float-type check valve that is intended to reduce the occurrence of damage to a float and a guide member.SOLUTION: A float-type check valve includes an annular valve seat, a float, a guide member, and a regulating member. The annular valve seat opens in the vertical direction and communicates between the upstream side and the downstream side of a drainage system. The float is located downstream of the annular valve seat and is movable in the vertical direction. As the water level of the drainage rises, the float rises and closes the opening to close the annular valve seat, and as the water level of the drainage falls, the float falls and opens the opening to open the annular valve seat. The guide member guides the vertical movement of the float. The regulating member has a water reservoir into which at least a portion of the drain water flows, and defines a lower limit position of the movement of the float. Further, the regulating member is a bowl-shaped body having a hemispherical concave portion serving as a water reservoir. The water reservoir can accommodate at least the lower half of the float at the lower limit position.SELECTED DRAWING: Figure 1

Description

The present invention relates to a float-type backflow prevention valve that is installed in a drainage system that discharges wastewater generated on the premises of a factory, inside a building, etc. to a river, the sea, a public drainage facility, etc.

Conventionally, in drainage systems that discharge wastewater generated on the premises of factories, buildings, etc. to rivers, the sea, public drainage facilities, etc., floats are used to prevent backflow in order to discharge water in the forward direction from upstream to downstream. A type check valve is provided (for example, see Patent Document 1).

Generally, a float-type check valve includes an annular valve seat that communicates between the upstream and downstream sides of a drainage system, a float located below the annular valve seat, and a plurality of guide rods ( guide member), etc. The float opens and closes the annular valve seat by rising and falling in accordance with the water level of the drainage water. In normal times, the water level is low, so the float descends and rests on (landing on) the bottom plate below the annular valve seat, and the annular valve seat is in an open state. Therefore, water is drained in a forward direction from upstream to downstream through the annular valve seat. On the other hand, during backflow, the water level rises, so the float is in a floating state and the annular valve seat is in a closed state. This prevents backflow to the upstream side of the annular valve seat.

Utility Model Publication No. 6-67588

In the above-described float-type check valve, since drainage acts on the float from above during normal times, rubbing (friction) between the guide member and the float may occur. For example, when drainage water hits the float on the bottom plate, the float swings from side to side, and this swing causes friction between the float and the guide member. Therefore, there is a possibility that the guide member or the float may be damaged.

An object of the present invention is to provide a float-type check valve that aims to reduce the occurrence of damage to a float and a guide member.

The float type check valve disposed in a drainage system for discharging water from upstream to downstream provided by the present invention includes an annular valve seat, a float, a guide member, and a regulating member. The annular toilet seat opens in the vertical direction and communicates between the upstream side and the downstream side of the drainage system. The float is located on the downstream side below the annular valve seat so that it can move vertically, and as the water level of the drainage water rises, it floats up and closes the opening, thereby closing the annular valve seat, and as the water level of the drainage water falls, it descends. The annular valve seat is opened by opening the opening. The guide member guides the vertical movement of the float. The regulating member has a water reservoir into which at least a portion of the drainage water flows, and defines a lower limit position of movement of the float. Further, the regulating member is a bowl-shaped body having a hemispherical concave portion serving as a water reservoir. The water reservoir can accommodate at least the lower half of the float at the lower limit position.

The bowl-shaped body may have a through hole that communicates the water reservoir with the downstream side of the drainage system.

The guide member may be three or more rod-shaped bodies disposed around the float and the water reservoir.

According to this invention, in normal times, at least the lower half of the float is accommodated in the hemispherical water reservoir of the regulating member, so that the float is suppressed from swinging in the left-right direction (horizontal direction), etc. . Furthermore, when the wastewater flows into the water reservoir, the wastewater accumulates in the water reservoir. As a result, the float is in a slightly floating state, and the collected drainage water acts as a buffer material, suppressing lateral (horizontal) shaking. Therefore, even when drainage acts on the float, it is possible to reduce the possibility that the float comes into contact with the guide member, and the occurrence of damage to the float and the guide member can be reduced.

FIG. 1 is a sectional view of a check valve according to an embodiment of the invention. FIG. 2 is a view from the downstream side of the non-return valve according to the embodiment of the present invention, with an annular valve seat and a valve seat retainer attached to the main body. FIG. 1 is a plan view and a sectional view of a bowl-shaped body of a check valve according to an embodiment of the present invention. FIG. 1 is a sectional view of a check valve according to an embodiment of the invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A float type check valve (hereinafter referred to as a check valve) which is an embodiment of the present invention will be described with reference to the drawings. Note that the configuration of the present invention is not limited to the embodiment.

FIG. 1 is a sectional view of a check valve 1 according to an embodiment of the invention. 2 is a view of the state in which the annular valve seat 6 and the valve seat retainer 14 are attached to the main body 5 of the check valve 1, viewed from the downstream side, and FIG. 3 is a plan view of the bowl-shaped body 8 of the check valve 1. They are a figure and a sectional view.

As shown in FIG. 1, the backflow prevention valve 1 of this embodiment is installed in a drainage system that discharges wastewater generated on the floor 2 of a building into a river, the sea, etc. prevents it from flowing backwards. The drainage system includes a recess H formed in the floor surface 2, a drain pipe 3 extending downward from the bottom of the recess H, and the like. The check valve 1 is disposed at the upper end of the drain pipe 3.

The check valve 1 includes a main body 5, an annular valve seat 6 attached to the main body 5 and four guide rods 7, a bowl-shaped body 8 attached to the guide rod 7, an annular valve seat 6, a guide rod 7, and a bowl-shaped body 5. It includes a float 9 and the like arranged inside the body 8. The main body 5 has a substantially cylindrical shape and has an upstream opening 11 that extends vertically and has a circular cross section. Further, a fitting 10 is screwed to the outer periphery of the upper part of the main body 5. The fixture 10 is fixedly supported in the recess H by welding 4.

The annular valve seat 6 is made of rubber, for example, and has a communication opening 6A in the center. The annular valve seat 6 is pressed and fixed to the lower end of the main body 5 via a valve seat holder 14. The annular valve seat 6 communicates between the upstream port 11 on the upstream side and the drain pipe 3 on the downstream side via the communication opening 6A.

The valve seat retainer 14 has an annular structure, as shown in FIG. The valve seat holder 14 has a small screw hole 12 for inserting a small screw 13 (see FIG. 1) for fixing the annular valve seat 6, and a screw hole 15 for inserting the guide rod 7. Note that the valve seat holder 14 is fixed to the main body 5 with machine screws 13, as shown in FIG.

The four guide rods 7 are made of metal such as stainless steel, and their upper ends are screwed into threaded holes 15 provided at equal intervals in the lower end of the main body 5, and are fixedly supported by the main body 5. These four guide rods 7 guide the float 9 in the vertical direction. In this embodiment, four guide rods 7 are provided, but illustration of one of the four guide rods 7 is omitted. Note that at least three guide rods 7 may be provided.

In addition, as shown in FIG. 1, the lower end of the guide rod 7 is screwed to a nut 17 while passing through the guide rod hole 16 (see FIG. 3) of the bowl-shaped body 8. Fixed support. The guide rod hole 16 is formed at the opening periphery of the bowl-shaped body 8, as shown in FIG. That is, the four guide rods 7 are arranged around the float 9 and the water reservoir 81 at equal intervals.

As shown in FIG. 1, the bowl-shaped body 8 has a hemispherical concave portion that is open on the float 9 side (upper part). Moreover, the bowl-shaped body 8 is made of resin, for example. The recess is a water reservoir 81 into which at least a portion of the drainage water from upstream flows. The drainage water that has flowed into the water reservoir 81 is temporarily collected therein. The collected drainage water passes through the through hole 82 from the water reservoir section 81 and flows into the drain pipe 3 on the downstream side. The through hole 82 communicates the water reservoir 81 with the drain pipe 3 on the downstream side. Four through holes 82 are formed in the bowl-shaped body 8 of this embodiment.

The water reservoir 81 is located inside the four guide rods 7 and has a diameter larger than the diameter (outer diameter) of the float 9. Therefore, the water reservoir 81 can accommodate the lower half of the float 9 that has descended, as shown in FIG. The position of the float 9 shown in FIG. 1 is the lower limit position of the float 9's movement. That is, the bowl-shaped body 8 corresponds to a defining member that defines the lower limit position of the float 9's movement. Note that the water reservoir portion 81 does not need to have a precise hemispherical shape, but may have a substantially hemispherical shape.

As shown in FIG. 1, the float 9 is made of metal such as stainless steel and has a hollow spherical shape. Further, the float 9 is formed to have a lighter specific gravity than the drainage water. For example, the float 9 floats up due to buoyancy while substantially the lower half thereof is submerged in water. Therefore, when water flows backward from the downstream side to the upstream side, the float 9 floats up as the water level in the drain pipe 3 rises, and a portion of the float 9 fits into the communication opening 6A of the annular valve seat 6. As a result, the communication opening 6A is closed and the annular valve seat 6 is closed. Thereafter, the float 9 descends due to the lowering of the water level and no longer fits into the communication opening 6A of the annular valve seat 6. As a result, the communication opening 6A is opened and the annular valve seat 6 is opened.

Further, under normal conditions, when no water is collected in the water reservoir 81, the float 9 is accommodated (seated) in the water reservoir 81 as shown in FIG. On the other hand, when waste water is temporarily collected in the water reservoir 81, the float 9 is in a slightly floating state within the water reservoir 81, as shown in FIG. Note that the float 9 does not need to have a precise spherical shape, but may have a substantially spherical shape that can close the annular valve seat 6.

Next, the operation of the check valve 1 during normal times and backflow will be explained.

In normal times when wastewater flows in the forward direction, the water level in the drain pipe 3 is generally lower than the position of the bowl-shaped body 8, so the float 9 descends due to its own weight, etc., as shown in FIG. It is now housed in the water reservoir 81. Therefore, the annular valve seat 6 is in an open state. As a result, the drainage water flows from the floor surface 2 (upstream) through the upstream port 11, the communication opening 6A of the annular valve seat 6, between the guide rods 7, the water reservoir 81 and the through hole 82, and finally flows to the downstream port 19. Discharged into rivers, etc. (downstream).

Note that when drainage is occurring during normal times, a portion of the drainage may hit the float 9. Even when drainage acts on the float 9 in this way, at least the lower half of the float 9 is accommodated in the water reservoir 81, so that the float 9 is prevented from shaking in the left-right direction (horizontal direction), etc. be done. Moreover, since the water reservoir 81 is located inside the four guide rods 7, the float 9 accommodated in the water reservoir 81 is unlikely to come into contact with the guide rods 7. Further, when a part of the waste water flows into the water reservoir section 81, the waste water temporarily accumulates in the water reservoir section 81. As a result, the float 9 is brought into a slightly floating state as shown in FIG. In this case as well, the collected drainage water acts as a buffer material, suppressing shaking in the left-right direction (horizontal direction). Note that when the waste water temporarily accumulated in the water reservoir 81 passes through the through hole 82 and flows out downstream, the float 9 is again seated on the water reservoir 81 as shown in FIG.

Next, when water flows backward from the downstream side, the water level in the drain pipe 3 rises from the downstream side toward the annular valve seat 6. Therefore, the float 9 floats up due to buoyancy, for example, with substantially the lower half submerged in water. When the water level further rises, the float 9 closes the communication opening 6A, so that the annular valve seat 6 becomes closed. This reliably prevents water from flowing backwards to the upstream side of the annular valve seat 6 and overflowing onto the floor surface 2 or the like. Thereafter, when the backflow is eliminated and the water level is lowered, the float 9 descends due to its own weight and the communication opening 6A is opened, so that the annular valve seat 6 returns to the open state. The float 9 that has descended is now seated in the water reservoir 81. In this case, since the bowl-shaped body 8 is made of resin, it can absorb the impact caused by the descent, and deformation of the float 9 is suppressed.

As described above, in normal times, at least the lower half of the float is accommodated in the hemispherical water reservoir of the regulating member (bowl-shaped body), so that the float may sway in the left-right direction (horizontal direction), etc. is suppressed. Furthermore, when the wastewater flows into the water reservoir, the wastewater accumulates in the water reservoir. As a result, the float is in a slightly floating state, and the collected drainage water acts as a buffer material, suppressing lateral (horizontal) shaking. Thereby, even when drainage acts on the float, it is possible to reduce the possibility that the float comes into contact with the guide member (guide rod), and it is possible to reduce the occurrence of damage to the float and the guide member (guide rod).

Furthermore, since the water reservoir is located inside the guide member, even if drainage acts on the float, the float is unlikely to come into contact with the guide member.

In the present embodiment, the water reservoir (recess) of the bowl-shaped body has a depth that accommodates (covers) the lower half of the float at the lower limit position, but is not particularly limited to this. The depth may be such that at least the lower half of the float is accommodated at the lower limit position.

In addition, the bowl-shaped body (regulating member) of this embodiment may be arranged in the height direction as long as the float does not close the annular valve seat when waste water is temporarily accumulated in the water reservoir under normal conditions. .

Furthermore, in this embodiment, the through hole is provided in the water reservoir (recess) of the bowl-shaped body, but the through hole may not be provided. Further, the number, position, shape, and size of the through holes are not limited to the configuration shown in FIG. 3. Any configuration can be adopted as long as the drainage water temporarily accumulates in the water reservoir.

This invention is designed to discharge wastewater generated on the premises or inside buildings of factories into rivers, the sea, public drainage facilities, etc., or to drain water used in bathtubs, washrooms, etc. in households into public drainage facilities, etc. It can be used in the industrial field of constructing, selling, and operating drainage systems, etc.

1 Float type check valve 5 Main body 6 Annular valve seat 7 Guide rod (guide member)
8 Bowl-shaped body (specified member)
9 Float 81 Water reservoir

Claims (3)

A float-type non-return valve installed in a drainage system that drains water from upstream to downstream,
an annular valve seat that opens in the vertical direction and communicates between the upstream side and the downstream side of the drainage system;
The annular valve seat is located on the downstream side below the annular valve seat so as to be movable in the vertical direction, and floats as the water level of the drainage water rises and closes the opening to close the annular valve seat, and descends as the water level of the drainage water falls. a float that opens the annular valve seat by opening the opening;
a guide member that guides vertical movement of the float;
A defining member having a water reservoir into which at least a portion of the wastewater flows, and defining a lower limit position of movement of the float;
Equipped with
The regulating member is a bowl-shaped body having a hemispherical recess that is the water reservoir,
The float-type check valve is characterized in that the water reservoir can accommodate at least a lower half of the float at the lower limit position. 2. The float type check valve according to claim 1, wherein the bowl-shaped body has a through hole that communicates the water reservoir with the downstream side of the drainage system. 2. The float type check valve according to claim 1, wherein the guide member is three or more rod-shaped bodies arranged around the float and the water reservoir.

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