JPH0234477Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention detects the water level when the water that has accumulated inside the piping pit (including valve chambers, etc.) due to infiltration or leakage reaches a certain level. This invention relates to a device that automatically drains water.

[Prior Art] Conventional automatic drainage devices of this type are generally configured to detect the water level in a reservoir installed inside a piping pit, etc., and drive an electric pump to automatically drain the water. It was spot on.

[Problem that the invention aims to solve] However, since this device is installed in a place with high humidity such as inside a piping pit or may be flooded, it is a harsh environment for electric appliances, electric switches, etc. environment, the switch may malfunction, the electric pump may operate under no load, causing failure, requiring regular maintenance work, and the wiring system of the electric pump itself may cause electrical leakage. There was a risk that this would not only lead to equipment failure or damage, but also cause an electric shock accident.

The present invention was developed in view of the above points, and the purpose of the present invention is to provide a drainage device that senses the water level of a reservoir and operates automatically without using electric appliances or electric switches that are sensitive to humidity. do.

[Means for solving the problem] In order to achieve the above purpose, in this invention,
A branch pipe that communicates with the high-pressure water pipe installed in the piping bit; and a valve box with a primary flow path and a secondary flow path that is linked to the vertical movement of a float installed in the reservoir. a water level sensing switching valve equipped with a valve body for opening and closing the primary and secondary flow paths; a vortex chamber, and a high-pressure water inflow pipe is connected to the water turbine chamber in a direction perpendicular to the rotating shaft, and a high-pressure water outflow pipe is connected to the axial direction of the rotating shaft, respectively; a centrifugal pump configured by connecting an opened water suction pipe in the axial direction of the rotating shaft and a drain pipe with a drain port opened outside the piping pit in the direction perpendicular to the rotating shaft; the primary of the water level sensing switching valve; The present invention is characterized in that the side flow path is connected to the branch pipe, and the secondary flow path is connected to the high-pressure water inflow pipe of the centrifugal pump.

[Function] When the water level in the reservoir rises above a certain level, as the float rises, the valve body in the valve box that is linked to this operates, and the primary flow path and the secondary flow path of the valve box are connected. Open state. As a result, high-pressure water from the high-pressure water pipe passes through the branch pipe, the primary flow path, and the secondary flow path, enters the high-pressure water inflow pipe, and is injected from the inflow pipe into the water wheel chamber of the centrifugal pump to rotate the water wheel. The used water stream is discharged through a high pressure water outlet pipe. When the water wheel rotates, an impeller mounted on the same rotating shaft is driven, and when the impeller rotates, accumulated water is sucked in from the water suction pipe connected to the swirl chamber, and is automatically drained out of the piping pit from the drain pipe. Ru.

When the water level in the reservoir falls due to automatic drainage of accumulated water, the float also descends, and when the water level drops below a certain level, the valve body interlocked with the float closes the primary and secondary flow paths of the valve box. The system closes the system and stops automatic drainage of accumulated water.

[Example] Hereinafter, an example of the automatic drainage device according to the present invention will be described based on the drawings.

FIG. 1 shows an embodiment of the present invention, in which a branch pipe 3 is connected to a high-pressure water pipe 2 arranged in a piping pit 1. A water level sensing switching valve 6 equipped with a float 5 is connected to this branch pipe 3 via a check valve 4, and the secondary side of this water level sensing switching valve 6 is connected to a centrifugal pump 10 via an inflow pipe 7. has been done. Note that 8 is a repair valve for preventing high-pressure water flow from flowing into the branch pipe 3 during repairs, etc., and 9 is a manhole.

FIG. 2 is an enlarged detailed view of the water level sensing switching valve 6. A float 5 is attached to the upper end of the support column 6c that is erected on the outer periphery of the primary flow path 6b of the angle valve type valve box 6a. The base end of the attached float shaft 5a is pivoted so as to be rotatable in the vertical direction, and the float shaft 5a
a is normally in the D position. This float shaft 5a is made of an elastic material having a predetermined amount of deflection.

A valve body 6 is provided at the bent portion of the secondary flow path 6f that is bent at right angles to the primary flow path 6b within the valve box 6a.
d is fixed to the lower end of the valve stem 6e and is suspended to be able to open and close the secondary flow path 6f connected to the inflow pipe 7, and the valve stem 6e passes through the lid 6g at the upper part of the valve box 6a. A ring-shaped valve operating portion 6i is attached to the upper end of the extended valve stem 6e, and the base of the float shaft 5a is placed within the ring of the valve operating portion 6i. The end is inserted loosely.

FIG. 3 is an enlarged detailed view of the centrifugal pump 10,
The centrifugal pump 10 has a water turbine chamber 12 in which a water turbine 11 is housed.
a, and a spiral chamber 12b which houses an impeller 14 that is rotatably mounted on the rotating shaft 13 of the water turbine 11. The water turbine chamber 12a has a high-pressure water inlet pipe 15 extending in a direction perpendicular to the rotating shaft 13 of the water turbine 11 that is installed inside the water turbine chamber 12a. However, a high-pressure water outflow pipe 16 is connected to the center of the side surface in the axial direction of the rotary shaft 13, and a water intake pipe 16 is connected to the swirl chamber 12b in the axial direction of the rotary shaft 13 at the center of the side surface.
7 is connected to a drain pipe 18 in a direction perpendicular to the rotating shaft 13. The high-pressure water inflow pipe 15 is an inflow pipe 7 connected to the secondary flow path 6f of the water level sensing switching valve 6.
The high-pressure water outflow pipe 16 has its outlet placed outside the piping pit 1 so that used high-pressure water can be discharged outside the piping pit 1. In addition, the water suction pipe 17 is equipped with a strainer 19 at the water suction port at the lower end.
The drain pipe 18 has its drain port located in the water reservoir 20 provided at the bottom of the piping pit 1.
They are placed outside. This centrifugal pump 10 has a non-sealing structure, and the water turbine chamber 1
The high-pressure water flow in 2a passes through the bearing of the rotating shaft 13 and flows into the swirl chamber 12b, and this water serves as priming water to enable pump operation when the centrifugal pump 10 is started.

Next, to explain the operation of the automatic drainage device configured as above, water leakage from the connecting part of the high-pressure water pipe 2 installed in the piping pit 1 or rainwater entering from the outside of the piping pit 1, etc. When the water level gradually rises, the float 5 floating on the water surface of the reservoir 20 rises as the water surface rises, and the float shaft 5a equipped with the float 5 is moved from the inner lower surface of the ring of the valve operating part 6i into which it is loosely inserted. It leaves and begins moving upwards within the ring. At this time, the pressing force exerted by the float shaft 5a on the valve body 6d is released, but the secondary side flow path 6d is affected by the primary side water pressure communicating with the inside of the valve box 6a.
f is maintained in a fluid-tightly closed state. As the water level further rises, the float shaft 5a reaches the B position and comes into contact with the inner upper surface of the ring of the valve operating portion 6i, and when it continues to rise, the float shaft 5a receives the buoyancy of the float 5 attached to the tip, and the float shaft 5a moves toward the valve. The inner upper surface of the operating portion 6i is pressed upward, but since the float shaft 5a has elasticity, the float shaft 5a flexes and maintains the float 5 on the water surface.

Next, when the float shaft 5a becomes more flexible due to its elasticity, the float 5 begins to be submerged as the water level rises, the buoyancy gradually increases, and the upward pressing force of the float shaft 5a pushes the valve body 6d. The water pressure increases to the point where it is removed from the mouth of the secondary flow path 6f against the mouth of the secondary flow path 6f, and when the equilibrium state with the water pressure is passed, the valve operation part 6i is suddenly pulled up to the upper stroke limit, The valve rod 6e connected to the valve operating portion 6i and the valve body 6d suspended at the lower end of the valve rod 6e are fully opened, and the flow path inside the valve body 6a is communicated in a very short time, allowing high-pressure delivery. A high-pressure water stream from the water pipe 2 is rapidly introduced into the inflow pipe 7 and is sent to the centrifugal pump 10. When fully opened, the valve body 6d is fitted into a recess formed on the inner surface of the lid body 6g, thereby reducing the amount of water head loss by reducing the amount of protrusion into the valve body 6a.

A high pressure water flow is supplied to the centrifugal pump 10 via the inflow pipe 7.
When the high-pressure water flows in, the high-pressure water from the high-pressure water inflow pipe 15 flows into the water turbine chamber 12a and rotates the water wheel 11, and the used water flow is discharged from the high-pressure water outflow pipe 16 to the outside of the piping pit 1.

When the water wheel 11 rotates, the impeller 14 which is rotatably mounted on the same rotating shaft 13 is driven, and when the impeller 14 rotates, the water stored in the reservoir 20 is drawn from the water suction pipe 17 connected to the center of the side surface of the swirl chamber 12b. is inhaled and automatically drained out of the piping pit 1 from a drain pipe 18 connected perpendicularly to the rotating shaft 13 of the swirl chamber 12b.

When the centrifugal pump 10 is operated to discharge the accumulated water as described above, the accumulated water at the bottom of the piping pit 1 is gradually reduced, the water level is gradually lowered, and the float 5 floating on the water surface is also lowered. As the float 5 descends, the float shaft 5a descends from the A position where the water level sensing switching valve 6 is fully open, and descends within the ring of the valve operating section 6i, but the float shaft 5a moves downwards within the ring of the valve operating section 6i and the valve stem 6e connected thereto. The valve body 6d is held in a fully open state by the frictional resistance between the sealing member 6h and the valve stem 6e and the water pressure inside the valve body 6a, and the accumulated water is further reduced and the float shaft 5
C where a is in contact with the inner lower surface of the ring of the valve operating portion 6i
When the float shaft 5a reaches this position, the float shaft 5a stops descending, and thereafter, as the water surface falls, the submerged part of the float 5 gradually decreases, the weight of the float 5 hanging on the float shaft 5a increases, and the float 5 leaves the water surface. and the valve stem 6e against the force holding the valve stem 6e.
Since the low frictional resistance of the seal portion 6h is set to lower the water level, the water level sensing switching valve 6 closes when the water level in the water reservoir 20 drops to a predetermined height.

As described above, when the valve operating part 6i is pushed downward by the float shaft 5a, the valve body 6d is moved by the suction force of the high-pressure water flow flowing into the secondary side of the valve box 6a and the back pressure on the primary side. It operates all at once, and the float shaft 5
a descends to the D position, completely blocks the secondary flow path 6f in a very short time, and completes the fully closing operation of the water level sensing switching valve 6.

Furthermore, since the float shaft 5a of the water level sensing switching valve 6 is made of an elastic material, the valve can be operated from fully closed to fully open, or from fully open to fully closed, all at once, as described above. By instantaneously conducting and shutting off the high-pressure water flow, the high-pressure water flow can be used efficiently.

Since the water level sensing switching valve 6 opens and closes as described above, the installation height is determined by the upper and lower limits of the reservoir water level. can be automatically discharged.

[Effects of the invention] As described above, the automatic drainage device according to the invention is arranged in a valve box having an inlet flow path and a secondary flow path in conjunction with the vertical movement of a float disposed in a reservoir. a water level sensing switching valve equipped with a valve body for opening and closing the primary and secondary flow paths; a vortex chamber, and a high-pressure water inflow pipe is connected to the water turbine chamber in a direction perpendicular to the rotating shaft, and a high-pressure water outflow pipe is connected to the axial direction of the rotating shaft, respectively; a centrifugal pump configured by connecting an opened water suction pipe in the axial direction of the rotating shaft and a drain pipe with a drain port opened outside the piping pit in the direction perpendicular to the rotating shaft; the primary of the water level sensing switching valve; side channel,
It is connected to a branch pipe that communicates with a high-pressure water pipe installed in the piping pit, and the secondary flow path is connected to the high-pressure water inflow pipe of the centrifugal pump, and the centrifugal pump for drainage is operated by the high-pressure water flow. This prevents the switch from malfunctioning or the pump from malfunctioning or being damaged, even if it is installed in a high-humidity atmosphere that is unsuitable for installing devices equipped with conventional electric pumps or electric switches, or in locations where there is a risk of flooding. Furthermore, since the centrifugal pump has a simple structure, stable operation can be achieved over a long period of time, and maintenance work can be reduced. Furthermore, because a high-pressure water stream is introduced from a nearby water pipe or the like as the power for the centrifugal pump, it is also economically superior.

[Brief explanation of the drawing]

FIG. 1 is an explanatory sectional view of a piping pit in which an automatic drainage device according to an embodiment of the present invention is arranged, FIG. 2 is an enlarged sectional view of a water level sensing switching valve, and FIG. 3 is an enlarged sectional view of a centrifugal pump. 1... Piping pit, 2... High pressure water pipe, 5...
Float, 5a...Float shaft, 6...Water level sensing switching valve, 6a...Valve box, 6b...Primary side flow path, 6
d... Valve body, 6f... Secondary flow path, 7... Inflow pipe, 10... Centrifugal pump, 11... Water turbine, 12a
...Water wheel chamber, 12b...Vortex chamber, 13...Rotating shaft, 14...Impeller, 15...High pressure water inflow pipe, 1
6... High pressure water outflow pipe, 17... Water intake pipe, 18...
Drainage pipe, 20... Reservoir.

Claims (1)

[Scope of Claim for Utility Model Registration] A branch pipe connected to a high-pressure water pipe installed in a piping bit, and a valve box having a primary flow path and a secondary flow path,
A water level sensing switching valve equipped with a valve body that opens and closes the primary and secondary flow paths in conjunction with the vertical movement of a float installed in a reservoir, a water turbine room with a water wheel inside, and a water wheel chamber containing a water wheel; It has a volute chamber containing an impeller that is attached to the rotating shaft and rotates, and a high-pressure water inflow pipe is connected to the water turbine chamber in a direction perpendicular to the rotating shaft, and a high-pressure water outflow pipe is connected to the water turbine chamber in the axial direction of the rotating shaft. Further, a water suction pipe having a water intake port opening into the reservoir is connected to the swirl chamber in the axial direction of the rotating shaft, and a drain pipe having a drainage port opening outside the piping pit is connected in a direction perpendicular to the rotating shaft. an automatic drainage device comprising a centrifugal pump consisting of a centrifugal pump, wherein the primary side flow path of the water level sensing switching valve is connected to the branch pipe, and the secondary side flow path is connected to the high pressure water inflow pipe of the centrifugal pump. .