JPH0232880Y2 - - 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. This environment can cause switches to malfunction, cause the electric pump to operate under no load, and cause failures, requiring regular maintenance work, and the wiring system of the electric pump itself is prone to leakage. This could not only cause malfunction or damage to the equipment, but also pose a risk of electric shock.

This invention was made in view of the above points,
To provide a drainage device that senses the water level of a reservoir and automatically operates without using electric appliances, electric switches, etc. that are sensitive to humidity.

[Means for solving the problem] In order to achieve the above purpose, in this invention,
A branch pipe connected to the high-pressure water pipe installed in the piping pit, and a valve box with a primary flow path and a secondary flow path, linked to the vertical movement of a float installed in the reservoir. A water level sensing switching valve is provided with a valve body for opening and closing the primary and secondary flow paths, and a water intake pipe is provided with a water intake port in the reservoir, and a drainage port is provided outside the piping pit. A drain jet pump is connected to the pipe, and the inflow pipe is connected to this connection part with the inflow pipe facing substantially in the drainage direction, and the primary flow path of the water level sensing switching valve is connected to the branch pipe, and the secondary flow The drain pipe is connected to the inflow pipe of the wastewater jet pump.

[Function] When the water level in the reservoir rises above a predetermined 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 to each other. Open. As a result, high-pressure water from the high-pressure water pipe passes through the branch pipe, primary side flow path, and secondary side flow path, enters the inflow pipe, and flows from the inflow pipe into the drain pipe of the drainage jet pump in the approximately draining direction and is ejected as a jet water stream. do. Along with this, the inside of the water suction pipe becomes a negative pressure and the water in the reservoir is sucked in, and the water is discharged outside the piping pit by the conveying force of the jet water flow, thereby automatically draining the water.

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

[Example] Next, 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 . The secondary side of this water level sensing switching valve 6 is connected to an inflow pipe 8 to a drainage jet pump 7. Water suction pipe 7a of the drainage jet pump 7
The lower end water intake port is piped into a reservoir 9 formed at the bottom of the piping pit 1, and the drain pipe 7b is piped approximately vertically along the side wall of the piping pit 1, and the drainage port is connected to the piping pit 1 from above. It is extended outside. An inflow pipe 7c is connected to the connection portion between the water suction pipe 7a and the drain pipe 7b so as to face substantially in the drainage direction, and the inflow pipe 8 is connected to this inflow pipe 7c.
Note that 10 is a repair valve for preventing high-pressure water flow from flowing into the branch pipe 3 during repairs, etc., and 11 is a manhole.

Moreover, FIG. 2 is an enlarged detailed view of the water level sensing switching valve 6 used in the above embodiment. The base end of a float shaft 5a having a float 5 attached to its tip is rotatably mounted in the vertical direction, and the float shaft 5a is normally at 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 8, 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.

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. As the water level gradually rises, the float 5 floating on the water surface of the reservoir 9 rises to the surface as the water surface rises, and the float 5
The float shaft 5a with the floating shaft 5a detaches from the inner lower surface of the ring of the valve operating portion 6i into which it is loosely inserted, and starts moving upward within the ring. At this time, the pressing force applied to the valve body 6d by the float shaft 5a is released, but the valve body 6d
The secondary side flow path 6f is caused by the primary side water pressure communicating in a.
It maintains a liquid-tight 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 by 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. Inflow pipe 8 for high pressure water flow from water pipe 2
The water is rapidly introduced into the drain and sent to the drainage jet pump 7. When the valve body 6d is fully opened, it is fitted into a recess formed on the inner surface of the lid body 6g, and the head loss is reduced by reducing the amount of protrusion into the valve box 6a.

When the high-pressure water flow flows into the drain jet pump 7 through the inflow pipe 8, the jet water flow from the inflow pipe 7c is ejected into the drain port 7b in the direction of drainage, and the inside of the water suction pipe 7a becomes negative pressure, causing a reservoir. The accumulated water in the water pond 9 is sucked and the accumulated water is drained out of the piping pit 1 by the conveying force of the jet water flow, thereby automatically draining the accumulated water.

When the drain jet pump 7 is operated to drain 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 fully open position A of the water level sensing switching valve 6, 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. and the valve body 6d are connected to the sealing member 6h and the valve stem 6e.
The valve is held in a fully open state by the frictional resistance of stops descending,
Thereafter, as the water level falls, the submerged portion of the float 5 gradually decreases, the weight of the float 5 hanging on the float shaft 5a increases, and when the float 5 leaves the water surface, it resists the force holding the valve stem 6e. The valve stem 6
Since the low frictional resistance of the seal portion 6h is set to lower the water level e, the water level sensing switching valve 6 closes when the water level in the reservoir 9 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 is formed 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, and high pressure to the drain jet pump 7 can be achieved. By instantaneously conducting and shutting off the water flow, 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 drained.

[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 is provided with a valve body for opening and closing the primary and secondary flow paths, and a water intake pipe is provided with a water intake port in the reservoir, and a drainage port is provided outside the piping pit. A drain jet pump is connected to the pipe, and the inflow pipe is connected to the connecting portion with the inflow pipe facing substantially in the drain direction, and the primary side flow path of the water level sensing switching valve is
This is because 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 inflow pipe of the drainage jet pump, so that the drainage pump is operated by high-pressure water flow. ,
Even when installed in a high humidity atmosphere or in a location where there is a risk of flooding, equipment equipped with conventional electric pumps and electric switches is unsuitable for installation, and electric shock accidents may occur due to switch malfunction, pump failure or damage, and electrical leakage. Since there are no causes for this, and the structure of the drainage pump is simple, stable operation can be achieved over a long period of time, and maintenance and management labor can be saved. Furthermore, since a high-pressure water stream is introduced from a nearby water pipe as a power source for the drainage pump, it is also economically superior.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional explanatory diagram of a piping pit in which an automatic drainage device according to an embodiment of the present invention is arranged, and Fig.
FIG. 3 is an enlarged cross-sectional view of the water level sensing switching valve used in the embodiment shown in the figure. 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 side channel, 7...Drain jet pump, 7a...Suction pipe, 7b...Drain pipe, 7c...Inflow pipe, 8...Inflow pipe, 9...Storage pond .

Claims (1)

[Scope of Claim for Utility Model Registration] A valve box that has a branch pipe communicating with a high-pressure water pipe installed in a piping pit, a primary flow path, and a secondary flow path, and is installed in a water reservoir. A water level sensing switching valve is equipped with a valve element that opens and closes the primary and secondary flow paths in conjunction with the vertical movement of the float, and a water intake pipe with a water intake port located in the reservoir is connected to a pipe outside the piping pit. A drain pipe having a drain port arranged therein is connected to the drain pipe, and a drain jet pump is connected to this connection part with an inflow pipe facing substantially in the drain direction, and the primary side flow path of the water level sensing switching valve is connected to the branch pipe. An automatic drainage device characterized in that the secondary flow path is connected to the inflow pipe of the drainage jet pump.