JP3040740B2 - Emergency shut-off valve device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an emergency shut-off valve device installed in a pipeline connecting an emergency water storage tank and a water main used in an earthquake disaster or the like.

[0002]

2. Description of the Related Art Conventionally, emergency water tanks (tanks) are provided in roads, schoolyards or underground parks, for example, in order to secure living water for local residents in the event of a disaster such as an earthquake or to provide water for fire extinguishing. It is buried.

[0005] In this emergency water storage tank equipment, as shown in FIG. 5, a bypass pipe P is provided in a water main pipe (fluid pipe) S, and a water storage tank (tank) T is provided in the bypass pipe P. And an emergency shutoff valve 1 on the outflow / inflow side of the bypass pipe P, respectively.
1 and an emergency release valve 2 is provided in the water main S between the bypass pipes P. In the figure, 3 is a fire hydrant,
4 is a manual pump and 5 is an air valve.

In normal times, the emergency shutoff valves 1 and 1 are opened, the emergency release valve 2 is closed, and water flows as indicated by arrows a, b, c and d to store water in the water storage tank T. ,
Rotation is prevented by preventing water from stagnating in the water storage tank T. On the other hand, in an emergency such as an earthquake (emergency or abnormal), the emergency shutoff valves 1 and 1 are closed, the emergency opening valve 2 is opened, the flow of the water main S is secured, and the water storage tank T is closed. By cutting off from the main pipe S, the outflow of water from the water storage tank T due to the siphon phenomenon is prevented, and the water is secured.

[0005] In this emergency water storage tank equipment, for example, a four-way butterfly valve described in JP-A-64-21275 can be used as an integrated unit of the emergency shut-off valve 1 and the emergency opening valve 2. In this valve, as shown in FIG. 6, a bypass pipe P is connected to one of two ports, and a water main pipe S is connected to the other two ports. a, b, c, and d are circulated as shown by arrows. In an emergency, the lock of the weight (not shown) is released by an electric signal of the seismic sensor, and the valve body f is rotated with the lowering of the weight, The bypass pipe P and the water main S are cut off by being positioned as indicated by the solid line, and their return is performed manually.

[0006]

However, in the above-mentioned seismic sensing type butterfly valve using the weight,
The mechanism becomes complicated due to the weight locking device and the shock absorber.

If the pressure of the water main pipe S drops due to a pipe rupture or the like in a state where the weight is not lowered by the earthquake sensor, the water in the water storage tank T may be lost without an emergency shutoff. There is also.

Accordingly, an object of the present invention is to provide an emergency shut-off valve device capable of detecting an earthquake with a simple mechanism to perform an emergency shut-off, and also having a pressure sensing mechanism.

[0009]

According to a first aspect of the present invention, a fluid pipe is provided with a bypass pipe, and a four-way switching type is provided between the fluid pipe and the bypass pipe. A main valve is provided, a bypass pipe or a fluid pipe is connected to two ports of the main valve, and a fluid pipe or a bypass pipe is connected to the other two ports, and the fluid pressure of the fluid pipe is controlled via the pressure guiding pipe. In an emergency shut-off valve device, the valve is driven to a cylinder of a valve drive unit of a main valve, and a pressure change in the cylinder activates the valve drive unit to make a flow of a fluid conduit flow through a bypass pipe. The main valve is provided with an automatic valve that operates in response to an earthquake signal, and when an earthquake is detected, the automatic valve opens, discharges fluid in the cylinder, activates a valve body driving unit, and controls the flow to the bypass pipe. I tried to cut it off.

[0010] In this case, the valve can be driven by a simple mechanism and the emergency shutoff can be performed without providing a weight, a lock device thereof, a buffer device and the like.

In addition, an automatic valve which operates in response to an earthquake signal is provided in the impulse line, and the automatic valve is closed when an earthquake is detected.
By preventing the inflow of fluid into the cylinder (claim 2), the action of the primary pressure on the cylinder at the time of earthquake detection can be stopped, and the emergency shutoff can be reliably performed.

Further, a pilot valve is interposed in the impulse line, a pressure change in the fluid line is detected by the pilot valve, and the impulse line is opened and closed based on the detected pressure. When the drive unit is operated (claim 3), even when the pressure in the fluid pipeline decreases due to a pipe rupture or the like in a state where the automatic valve is not operated, the pressure decrease is detected and the emergency shutoff is performed. You.

[0013] In addition, an on-off valve is provided in the impulse line,
At the time of the emergency shutoff, if the on-off valve is closed and the shutoff state is maintained in accordance with the operation of the valve body drive unit (claim 4), the operation becomes a manual reset type, and even if the automatic valve returns to the initial state due to a power failure or the like. No automatic return.

[0014]

FIG. 1 shows a first embodiment of the present invention. In this figure, reference numeral 10 denotes a valve box of a main valve (four-way switching valve) V, which includes a first port (port) 11a and a second port (port) 11a.
One divided body 10a having a port (mouth) 11b, the other divided body 10b having a third port (mouth) 11c and a fourth port (mouth) 11d, and a lid 10 of one divided body 10a
c, the two divided bodies 10a and 10b, one of the divided bodies 10a and the lid 10c are each provided with a packing (seal) 12
And are integrated by a bolt 13. Bolts 13 are provided at appropriate positions around the periphery.

A valve stem 14 is inserted into the center of the valve box 10.
The valve stem 14 is supported movably in the axial direction by bearings 15a and 15b on the bottom surface of the lid 10c and the other divided body 10b. In the valve box 10, partition walls 16a, 16b, 16c are provided to cross the valve rod 14, and the first chamber 17a of the first port 11a, the second chamber 17b of the second port 11b, and the third chamber 11b of the third port 11c are provided. It is divided into four chambers of a third chamber 17c and a fourth chamber 17d of a fourth port 11d.

The partition walls 16a, 16b, 16c are formed with communication holes 18a, 18b, 18c through which the valve rod 14 penetrates, and the peripheral edges of the holes 18a, 18b, 18c are first, second, and third valves. The seats are 19a, 19b, and 19c. The valve stem 14 is provided with valve bodies 20a and 20b which are in contact with and separated from the valve seats 19a, 19b and 19c. As shown by a solid line, the lower valve body 20b comes into contact with the second valve seat 19b. The upper valve body 20a is away from the first valve seat 19a and the lower valve body 20b is
The upper valve body 20a comes into contact with the first valve seat 19a when coming into contact with the third valve seat 19c apart from the first valve seat 9b. Valve seats 19a, 19b, 19c of the valve bodies 20a, 20b
A seal 21 is provided on the contact surface with the seal to ensure watertightness.

A valve body driving unit D is provided above the lid 10c of the valve box 10.
Is configured. The configuration is such that the upper part of the lid 10c is cylindrical, and the cylinder with the lid is screwed into the cylindrical part to form the cylinder 22. The upper end of the valve rod 14 is inserted into the cylinder 22, The piston 23 is firmly fixed. This piston 23 is pushed downward by a spring 24.

A pressure guiding tube 25 having one end communicating with the second chamber 11b and a pressure guiding tube 26 open to the outside air are connected to the opposite side of the spring 24 of the cylinder 22. Solenoid valves (automatic valves) VS1 and VS2 that operate in response to an electric signal from the earthquake sensor 27 (or an electric signal from a remote place) are provided. VS1 is a type that opens when energized, and VS2 is a type that closes when energized.

As shown in FIG. 3, the valve rod 14 protrudes from the upper surface of the cylinder 22 of the main valve V to form an operating rod 40, and the pressure guide tube 25 reaches to and is fixed by a mounting plate 41. . Pressure guide tube 25 along this mounting plate 41
Is provided with a locking valve (opening / closing valve) 42.
A lever 44 is provided on the second valve shaft. The operation stick 4
An operation rod 43 is screwed into the upper end of the “0”, and a pin 43 a of the operation rod 43 is fitted in a long hole 45 a of a link 45 connected to the lever 44. Therefore, the lever 44 pivots via the link 45 in accordance with the vertical movement of the operation rod 40, and the locking valve 42 is opened and closed. The opening / closing adjustment is performed at a position where the operation rod 43 is screwed into the operation rod 40.

The locking valve 42 is provided with a bypass pipe 28 as shown in FIG.
A return opening / closing valve (selection opening / closing valve) 46 is interposed. The return on-off valve 46 is normally closed. The positional relationship between the locking valve 42 and the solenoid valve VS2 in the pressure guiding tube 25 is arbitrary.

When the emergency shut-off valve device configured as described above is used in the above-mentioned emergency water storage tank equipment, a bypass pipe P having a water storage tank T interposed between the first and fourth ports 11a and 11d, 2. Connect the water main S to the third ports 11b and 11c.

In this connection state, the solenoid valve VS1 is normally closed, and the solenoid valve VS2 and the locking valve 4 are normally closed.
2 is open. Therefore, the water pressure of the water main S is applied to the inside of the cylinder 22, the piston 23 compresses the spring 24 and is located at the top dead center, the valve rod 14 is also located upward, and the valve body 20b is connected to the second valve. Abuts on the seat 19b and the valve body 2
0a maintains a state separated from the first valve seat 19a. In this state, the first chamber 17a communicates with the second chamber 17b, and the third chamber 17c communicates with the fourth chamber 17d. The water in the water main S flows as shown by the solid line or the broken line in FIG. Pass through. At this time, as shown in FIG. 4A, the operation rod 40 is also raised, and the pin 43a is located at the upper end of the long hole 45a.

When an earthquake occurs and an electric signal is sent from the earthquake detector 27 to the solenoid valves VS1 and VS2, the solenoid valve VS2 is closed and the water pressure in the water main S is reduced to the cylinder 22.
At the same time, the solenoid valve VS1 is opened and the water in the cylinder 22 is discharged. As a result, the piston 23 is moved down to the bottom dead center position by the spring 24, the valve rod 14 is also positioned below, and the valve body 20b is moved to the second valve seat 19b.
Away from the third valve seat 19c, and the valve body 2
0a comes into contact with the first valve seat 19a. In this state, the second chamber 17b and the third chamber 17c communicate, and the first and fourth chambers 17a,
Reference numeral 17d denotes a chamber which is shut off from the second and third chambers 17b and 17c. The water in the water main pipe S flows downstream without passing through the water storage tank T, and the water in the water storage tank T is secured.

At this time, as the valve rod 14 is lowered, the operating rod 40 is also lowered, and after the pin 43a moves from the upper end to the lower end in the elongated hole 45a, as shown in FIGS. The locking valve 42 is closed via. By this closing, the pressure guiding tube 25 is cut off, and even if the solenoid valves VS1 and VS2 return to their original states due to a power failure or running out of battery, the water pressure is not applied to the cylinder 22. For this reason, the main valve V keeps the state where the flow path through the water storage tank T is closed.

In the self-holding function, even if the valve elements 20a and 20b of the operating valve V move due to vibration force due to an earthquake, the operation rod 40 is moved up and down by the elongate hole 4 of the pin 43a.
It is absorbed by the movement in 5a, and the locking valve 42 is not affected. That is, the self-holding function state is maintained.

The release of the self-holding function is performed by opening the return on-off valve 46 in a state where it has returned to the normal state. That is, when the return on-off valve 46 is opened, the water pressure of the water main pipe S raises the piston 23 through the bypass pipe 28.
At this time, the operating rod 40 rises as the valve rod 14 rises, and as shown in FIG. 4D, the pin 43a initially moves in the elongated hole 45a and contacts the end thereof, and then the link 45
(A), the locking valve 42 shown in FIG.

The solenoid valve VS2 is provided to stop the action of the primary pressure on the cylinder 22 at the time of detecting an earthquake, and to perform an emergency shutoff without fail. Retention is performed.

FIG. 2 shows a second embodiment of the present invention. In this example, a pressure sensing pilot valve 30 is interposed in the pressure guiding tube 25 described above. The positional relationship among the pilot valve 30, the locking valve 42, and the solenoid valve VS2 in the pressure guiding tube 25 is arbitrary.

The pilot valve 30 is a three-way valve having a first port (port) 31a, a second port (port) 31b, and a third port (port) 31c. The cylinder 33 is provided.
The pressure guiding tube 25 is connected to the first port 31a and the second port 31b, respectively, and the third port 31c is openable to the outside air via the valve 25a. Valve 25a
Is always open. In the cylinder 33, a diaphragm 34 such as Velofram (trade name of Fujikura Rubber Co., Ltd.) is stretched and divided into two upper and lower chambers. The valve rod 35 protruding from the valve box 31 into the cylinder 33 is connected to the diaphragm 3.
4, the valve body (piston) 36 moves up and down in response to the bending of the diaphragm 34, and the valve seats 36a, 3a
6b.

The lower end of the spring 32 in the cylinder 33 contacts the diaphragm 34 and the other end of the spring 32 contacts (receives) a spring receiver 37. The spring receiver 37 moves in the cylinder 33 according to the screwing amount of the bolt 38 to expand and contract the spring 32. Therefore, the urging force of the spring 32 is adjusted by the screwing amount of the bolt 38, and the movement of the valve stem 35, that is, the pressure applied to the diaphragm 34 in which the valve body 36 comes into contact with and separates from the valve seats 36a and 36b can be adjusted. . The application is performed through a pilot port 39 via a pressure guiding tube 29 branched from the pressure guiding tube 25.

This emergency shut-off valve device, in the same way as the first embodiment, shuts off urgently by an earthquake signal.
Emergency shutoff is also performed due to a drop in water pressure due to pipe rupture.

That is, in a state where the solenoid valve VS1 is closed, the solenoid valve VS2 and the locking valve 42 are opened, and the water pressure of the water main S is higher than the pressure set by the spring 32 of the pilot valve 30, the normal state is indicated by a solid line. As a result, the pressure causes the diaphragm 34 to bend upward, the valve rod 35 also to rise, and the valve element 36 to be in pressure contact with the second valve seat 36b, thereby opening the flow path between the first port 31a and the second port 31b, The flow path between the second port 31b and the third port 31c is closed.

For this reason, the water pressure of the water main S is applied to the cylinder 22 of the main valve V, the valve rod 14 pushed up by the piston 23 is located above, and the valve body 20 b is moved to the second valve seat 19.
b, the valve body 20a is separated from the first valve seat 19a, the first chamber 17a communicates with the second chamber 17b, the third chamber 17c communicates with the fourth chamber 17d, and the water in the water main S is discharged. Flows as indicated by a solid line or a broken line in FIG.

On the other hand, if the solenoid valves VS1 and VS2 do not operate and, for example, a pipe rupture occurs and the water pressure of the water main pipe S becomes lower than the pressure set by the spring 32, the diaphragm is moved by the spring 32 as shown by a chain line. 34 is deflected downward, the valve rod 35 is also lowered, and the valve body 36 is separated from the second valve seat 36b, presses against the first valve seat 36a, and closes the flow path between the first port 31a and the second port 31b. Then, the flow path between the second port 31b and the third port 31c is opened. With this opening,
The inside of the cylinder 22 of the valve body driving unit D is opened to the outside air.

As a result, the piston 23 is lowered, the valve rod 14 is also positioned below, and the valve body 20b is moved to the third valve seat 19c.
In this state, the valve body 20a comes into contact with the first valve seat 19a, and the second chamber 17b and the third chamber 17c communicate with each other. The first and fourth chambers 17a and 17d are connected to the second and third chambers 17b and 17b. 17
c, the water in the water mains S flows downstream without passing through the water storage tank T, and the water in the water storage tank T is secured.

This shut-off state is maintained by the locking valve 42 which is closed as the valve rod 14 is lowered, and the return on-off valve 46 is manually opened to return.

If the return on-off valve 46 is left open, even if the emergency shutoff is performed due to the detection of an earthquake, the solenoid valves VS1 and VS2 return to the initial state due to a power failure or the like. , It becomes a pressure sensing type automatic return type.

[0038]

According to the present invention, as described above, the pressure in the fluid line is guided to the cylinder of the valve drive unit of the main valve via the pressure guiding tube, and the cylinder is operated by the automatic valve which receives an earthquake signal. Since the valve body drive section is operated by changing the internal pressure, the valve body can be driven by a simple mechanism and the emergency shutoff can be performed without providing a weight, a lock device thereof, a buffer device, and the like.

Further, a pilot valve may be interposed in the pressure guiding pipe to detect a change in pressure in the fluid conduit with the pilot valve, and the valve drive unit of the main valve may be operated based on the detected pressure. Also, even when the pressure in the fluid pipeline is reduced due to a pipe rupture or the like in a state where the automatic valve is not operated, the pressure drop is detected and the emergency shutoff is performed.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of an emergency shutoff valve device according to the present invention.

FIG. 2 is a sectional view showing a second embodiment of the same.

FIG. 3 is a view showing a holding mechanism of the on-off valve according to the first embodiment;

4A and 4B are explanatory diagrams of the operation of the holding mechanism, wherein FIG. 4A shows a state when the main valve is fully opened in normal times, FIG. 4B shows a state during an emergency, FIG. 4C shows a state when the main valve is fully closed, and FIG. When the main valve starts to open

FIG. 5 is an explanatory diagram of an emergency water storage facility.

FIG. 6 is a sectional view of a conventional example.

[Explanation of symbols]

P Bypass pipe S Water main pipe T Water tank (tank) V Main valve 10 Valve box 11a, 11b, 11c, 11d Port (port) of main valve V 14 Valve stem 16a, 16b, 16c Partition wall 17a First chamber 17b First 2 chamber 17c 3rd chamber 17d 4th chamber 18a, 18b, 18c Communication hole 19a 1st valve seat 19b 2nd valve seat 19c 3rd valve seat 20a, 20b Valve body D Valve body drive part 22 Cylinder 23 Piston 24 Spring 25, 26 Pressure guiding pipe 27 Earthquake detector 28 Bypass pipe VS1, VS2 Solenoid valve (automatic valve) 30 Pilot valve 31a, 31b, 31c Port (port) of pilot valve 30 32 Spring of pilot valve 33 Cylinder of pilot valve 34 Diaphragm of pilot valve 35 pilot valve valve shaft 36 pilot valve valve element 36a, 36b pilot valve valve seat 40 operation Working rod 42 On-off valve (locking valve) 45 Link 43a Link pin 45a Link long hole 46 Selectable on-off valve (return on-off valve)

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16K 11/00-11/24 F16K 17/18-17/36 F16K 31/12-31/42

Claims (4)

(57) [Claims] 1. A bypass pipe P is provided in a fluid pipe S, and a main valve V having the following configuration (A) is provided between the fluid pipe S and the bypass pipe P; 4 ports 11a, 1
1d, the bypass pipe P or the fluid pipe S is connected to the second and third ports 11b and 11c, and the fluid pipe S or the bypass pipe P is connected. In the emergency shut-off valve device, the valve drive unit D is actuated by the pressure change in the cylinder 22 and the flow of the fluid pipe S is made to pass through and bypass the bypass pipe P. V is provided with an automatic valve VS1 that operates in response to an earthquake signal. When an earthquake is detected, the automatic valve VS1 opens, discharges the fluid in the cylinder 22 described below, activates the valve body driving unit D, and connects to the bypass pipe P. An emergency shutoff valve device, wherein the flow is shut off. Configuration (A) “A valve rod 14 that slides on the same axis is provided in the valve box 10, and the valve rod 14
The partition walls 16a, 16b, 16c crossing the valve stem 14
The first, second, third, and fourth four chambers 17a, 17 are provided in the axial direction in the valve box 10 in the axial direction.
b, 17c, 17d, ports 11a, 11b, 11c, 11d are formed in the respective chambers, and the communication holes 18a, 18b, through which the valve stem 14 passes through the respective partition walls,
A first valve seat 19a is formed around the communication hole 18a between the first chamber 17a and the second chamber 17b, and a second valve seat 19b is formed around the communication hole 18b between the second chamber 17b and the third chamber 17c. 3
Third valve seats 19c are provided on the periphery of the communication hole 18c between the chamber 17c and the fourth chamber 17d. Each of the valve bodies is provided with a first and third valve seat 19.
a, 19c, separate from the second valve seat 19b, and contact with the second valve seat 19b, the first and third valve seats 19b.
a, 19c, and the valve box 10
Is provided with a piston 23 that is interlocked with the valve rod 14 in the cylinder 22 in which the valve rod 14 is inserted. " 2. An automatic valve VS2, which operates in response to an earthquake signal, is provided in the impulse line 25 so that the automatic valve V2 is activated when an earthquake is detected.
The emergency shut-off valve device according to claim 1, wherein S2 is closed to prevent the fluid from flowing into the cylinder 22. 3. A pilot valve 30 is interposed in the pressure guiding tube 25, and a pressure change in the fluid line S is detected by the pilot valve 30.
The emergency shut-off valve device according to claim 1 or 2, wherein the pressure guide tube 25 is opened and closed based on the detected pressure, and the valve drive unit D of the main valve V is operated. 4. An on-off valve 42 is provided in the pressure guiding tube 25,
At the time of emergency shut-off, the on-off valve 4
4. The emergency shutoff valve device according to claim 1, wherein the shutoff state is maintained by closing the second shutoff valve.