JPH03419Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a watertight rubber crimping device for an opening/closing gate provided in a water conduit penetrating deep into a water storage dam.

[Prior art and its problems]

FIG. 1 is a cross-sectional view showing the manner in which the opening/closing gate 1 (radial gate in the illustrated example) is attached, in which 2 indicates the dam body 3, a water pipe installed at the bottom of the dam body 2, and 4 indicates the opening/closing operation of the opening/closing gate 1. Hydraulic cylinder for, 5
1 shows a watertight rubber attached to the inner peripheral surface of the water conduit 3 to be pressed against the front peripheral area of the opening/closing gate 1.

The watertight rubber 5 has a structure in which a pressure force is applied by fluid pressure, and a watertight rubber pressure bonding device that uses dam water pressure water to exert pressure force has already been proposed.

That is, FIG. 2 is a piping diagram showing the above-mentioned conventional crimping device, in which dam pressure water (hereinafter referred to as "dam pressure") is supplied to the upper chamber 6a of the bag body 6 provided in the dam body 2.
into a lower chamber 6 separated by a diaphragm 7.
The pressure is transmitted to the antifreeze filled in the watertight rubber 5, and the antifreeze filled in the watertight rubber 5 generates a pressing force, and at the same time, the pipe 8 is pressurized from the pump 9 as an additional pressure α. ing.
In addition, 10 is a strainer, 11a and 11b are limit switches, 12 is a pressure switch, 13 is a drain, 14 is a fresh water tank, and 15 is a switching valve.

However, according to the above device, a pressure of dam pressure + α can be obtained, but when the water storage level (WL) rises or falls and the dam pressure changes in magnitude, the overall value of the pressure force of the watertight rubber 5 also increases or decreases accordingly. This causes a problem in that it cannot be adjusted and maintained at an appropriate value. Further, the automatic device as described above has a problem in that the water pressure changes rapidly due to the changeover switch, and the impact exerted on the watertight rubber 5 becomes large.

[Purpose of invention]

In view of the above-mentioned circumstances, the present invention has been made for the purpose of providing a watertight rubber crimping device that can apply appropriate crimping force to watertight rubber and further minimizes the impact force on watertight rubber as much as possible. .

[Structure of the idea]

In this invention, between the dam water intake and the watertight rubber,
An antifreeze mixing tank that replenishes dam water and mixes antifreeze liquid, and an airtight pressure tank that adjusts and maintains the antifreeze liquid sent from the antifreeze mixing tank to a predetermined pressure using a compressor are interposed; A differential pressure switch, which operates by comparing and detecting the difference between the water pressure of The water pressure in the airtight tank to be sent to the rubber is always set to +α pressure higher than the dam pressure, and a differential pressure switch that is activated by detecting the difference between the pressure inside the watertight rubber and the dam pressure is installed in the pressure water supply. The water pressure in the watertight rubber is controlled to increase or decrease by being connected to a switching valve installed in the pipe and a switching valve installed in a pressure water discharge pipe from the watertight rubber. It is characterized by having a structure in which a check valve for preventing a drop in water pressure is provided, and a flow rate regulating valve is arranged in a pressure water supply pipe and a pressure water discharge pipe to prevent sudden pressure changes.

〔Example〕

Hereinafter, the present invention will be explained in detail based on the exemplary drawing shown in FIG.

In the figure, 20 indicates a dam water intake port, 21 indicates a watertight rubber, and the dam intake port 20 and the watertight rubber 21
An antifreeze mixing tank 23 that supplies dam water and mixes antifreeze 22, and an airtight pressure tank 24 that adjusts and holds the antifreeze 22 sent from the antifreeze mixing tank 23 to a predetermined pressure. Intervention is provided.

The supply of dam water to the antifreeze mixing tank 23 is not always performed, and if the antifreeze 22 is in an appropriate amount as shown in the figure, the dam water supply valve 25 is closed. A level switch 26 detects the upper limit position of the antifreeze liquid 22, and a level switch 27 detects the lower limit position of the antifreeze liquid 22. The dam water supply valve 25 is opened and closed by signals from both switches 26 and 27. 29 is a valve for removing antifreeze, and 30 is a drain.

31 is a pump for sending the antifreeze liquid 22 to the airtight pressure tank 24, and 32 is a check valve. The antifreeze liquid 22 sent into the airtight pressure tank 24 receives pressurized air from the compressor 33 and is turned into pressurized water and sent to the watertight rubber 21. A manual compressor 34 is branched and connected between the compressor 33 and the airtight pressure tank 24, and is provided in case of a power outage or the like. 35 is a safety valve installed in the airtight pressure tank 24, and when the pressure water (antifreeze 22 in the airtight pressure tank 24 becomes overpressure), the compressor 33
It plays the role of releasing pressure from the air. 36 is an upper limit level switch attached to the airtight pressure tank 24; 37
is the same lower limit level switch, which stops or drives the pump 31 mentioned above. Reference numeral 38 indicates a valve used when drawing out the antifreeze liquid 22 from the airtight pressure tank 24, and 39 indicates a drain.

Then, the airtight pressure tank 24 and the watertight rubber 2
1 (pressure water supply pipe 40), a switching valve 41, a flow rate adjustment valve 42, a relief valve 43,
A check valve 50 is also provided. Also, the antifreeze 22 is transferred from the watertight rubber 21 to the antifreeze mixing tank 23.
A switching valve 44 and a flow rate adjustment valve 45 are also provided in the piping (pressure water discharge pipe 46) for returning the water, and when one of the switching valves 41 and 44 is open, the other is closed. The flow rate regulating valves 42 and 45 are provided to prevent sudden pressure changes from being applied to the watertight rubber 21. In addition, the relief valve 43
The check valve 50 is provided to protect the watertight rubber 21 from excessive negative pressure, and the check valve 50 is provided to prevent pressure drop in the event of water leakage from the watertight rubber 21 or the switching valve 41. The purpose is to prevent

47 detects the difference between the pressure water (antifreeze 22) in the airtight pressure tank 24 and the dam pressure and controls the compressor 33 and the safety valve 35 so that the pressure water is always +α
For example, if the +α pressure is set to 2 kg/cm ² , the compressor 33 will be stopped when the pressure water reaches the dam pressure + 2 kg/cm ² . If more pressure is applied, the safety valve 35 opens and the air blower 51 operates. Of course, when the +α pressure is lower than 2 kg/cm ² , the safety valve 35 is closed and the compressor 33 is driven.

48 is a differential pressure switch that detects the dam pressure and the water pressure difference in the watertight rubber 21 to open and close the above-mentioned switching valves 41 and 44 in order to control the water pressure in the watertight rubber 21 to the dam pressure + α pressure. That is, if the water pressure in the watertight rubber 21 is equal to or higher than the dam pressure + α pressure, the switching valve 41 closes, and if it is equal to or lower, the switching valve 41 opens.
The other switching valve 44 takes the opposite state.

Of course, the switching valves 41 and 44 are connected to the opening/closing gate 1.
During operation, the opening and closing operations can also be performed by operating buttons on a panel board (not shown).

It is also within the scope of the present invention to add a conduit 49 that uses only dam pressure as shown in the figure to increase versatility.

[Effect of idea]

As explained above, the present invention is such that the antifreeze in the airtight pressure tank is always supplied as properly pressurized water, and when the antifreeze is supplied, the difference between the water pressure in the watertight rubber and the dam pressure is detected and the system is automatically activated. It is carried out in
As a result, the intended purpose of keeping the water pressure inside the watertight rubber constant at all times could not be fully achieved, and a flow regulating valve and check valve were installed in the pressure water supply pipe to the watertight rubber, and A flow rate regulating valve is attached to the water discharge pipe, which has the remarkable effect of protecting the watertight rubber, preventing a drop in pressure due to water leakage, etc., and making it possible to achieve good crimping.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view illustrating how the opening/closing gate is attached, FIG. 2 is a piping diagram illustrating a conventional crimping device, and FIG. 3 is a diagram showing an embodiment of the present invention. 20 is a dam intake port, 21 is a watertight rubber, 22 is an antifreeze, 23 is an antifreeze mixing tank, 24 is an airtight pressure tank, 33 is a compressor, 35 is a safety valve, 4
0 is a pressure water supply pipe, 46 is a pressure water discharge pipe, 41,
44 is a switching valve, 47 and 48 are differential pressure switches, 4
2 and 45 are flow rate adjustment valves, and 50 is a check valve.

Claims (1)

[Scope of utility model registration request] Between the dam water intake and the watertight rubber, there is an antifreeze mixing tank that replenishes dam water and mixes antifreeze to create it, and an airtight pressure that adjusts and maintains the antifreeze sent from the antifreeze mixing tank to a predetermined pressure using a compressor. A differential pressure switch, which operates by comparing and detecting the difference between the water pressure in the airtight pressure tank and the dam pressure, is installed between the tank and the airtight pressure tank, and is used as a safety valve to release pressure from the compressor, and the pressure water is sent to the watertight rubber. The water pressure in the airtight tank that is connected to the relief valve attached to the supply pipe and sent to the watertight rubber is always higher than the dam pressure.
In addition, a differential pressure switch that operates by detecting the difference between the internal pressure of the watertight rubber and the dam pressure is installed in the pressure water supply pipe, and the pressure water is removed from the watertight rubber. The pressure water supply pipe is connected to a switching valve installed in the pipe to control the increase/decrease of the water pressure in the watertight rubber. A watertight rubber crimping device characterized by having a configuration in which a flow rate adjustment valve is arranged in a pipe and a pressure water discharge pipe to prevent sudden pressure changes.