JPH10246349A - Emergency shutoff valve for cistern - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it simple in structure less in the number of part items and small in size as well as to facilitate the work of mounting to a cistern. SOLUTION: A tubular valve body 4 forming a discharge port 3 of a cistern 2 is installed in this cistern 2 after piercing through a wall being close to the bottom. A valve stem 11 installed in this valve body 4 is supported by a bearing member 33 free of movements in the axial direction. In addition, a drive unit 38 of a shutoff valve 20 is attached to an outer boundary of the valve body 4, and its driving shaft 42 and the valve stem 11 are connected to each other by a lever 43. This drive unit 38 is usually connected to a commercial power source by a control circuit, and in time of power failure, it is made so as to be connected to an auxiliary power source. When the driving shaft 42 is rotated by drive of this drive unit 38, the valve stem 11 is rectilinearly shifted in the valve closing direction by the lever 43, making a valve element 6 adhere close to the discharge port 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an emergency shutoff valve for a water tank which automatically shuts off a water outlet of the water tank when an earthquake of a predetermined seismic intensity or higher is detected.

[0002]

2. Description of the Related Art In the event of a major earthquake, ensuring the safety of drinking water is a major problem. For this reason, in water receiving tanks and elevated water tanks that are installed in condominiums and store tap water,
When an earthquake sensor detects an earthquake when an earthquake occurs, an emergency shutoff valve for a tank (hereinafter, referred to as a shutoff valve) is provided which automatically shuts off a water outlet of the tank when the seismic sensor is activated.

FIG. 6 shows a conventional example of such a shut-off valve.
The shutoff valve 1 is mounted through a wall near the bottom of the water tank 2 and has a cylindrical valve body 4 having an inner open end forming a water outlet 3, and a water outlet 3 of the valve body 4 located in the water tank 2. And an actuator 7 for operating the valve body 6 from outside the water tank 2. The intermediate portion of the valve body 6 is rotatably supported by a bracket 8 attached to the outer peripheral surface of the valve body 4 via a connecting pin 9, and one end of the valve body 6 is rotatably connected to the tip of a valve rod 11 via the pin 12. They are freely connected. The valve stem 11 is slidably penetrated through a small hole 10 provided in the water tank 2, and has a base end protruding outside the water tank 2 and connected to the actuator 7. The actuator 7 is formed of a solenoid. When an earthquake sensor (not shown) detects an earthquake, the electric circuit is cut off, the magnetic force is lost, and the valve stem 11 is released. Thereby, the valve rod 11 moves to the water tank 2 side by the force of the spring. As a result, the valve element 6 rotates counterclockwise with the connecting pin 9 as a rotation fulcrum, and is brought into close contact with the water outlet 3 by the water pressure in the water tank 2 to stop water.

[0004] Reference numeral 13 denotes a pressure equalizing pipe 13 for communicating the inside of the water tank 2 with the inside of the valve body 4. The pressure equalizing pipe 13 is provided in order to make the water pressure in the valve body 4 equal to the water pressure in the water tank 2 in the valve closed state to reduce the driving force when switching from the valve closed state to the valve open state. In addition, 14 is a manual water stop valve, 15 is a water supply pipe, 16 is a bellows-shaped sealing member for sealing the small hole 10, and 17 is a mounting bracket for mounting the actuator 7 to the valve body 4.

[0005]

However, in the above-described conventional shut-off valve 1, the valve body 6 is attached to the valve body 4 after the valve body 4 is attached to the water tank 2, and the valve stem is then removed from the inside of the water tank 2. Since it is necessary to connect to the valve 11, there is a problem that the work of attaching to the water tank 2 is troublesome, and the valve itself becomes large and the installation space becomes large. Also, since the valve rod 11 is projected from the small hole 10 provided on the wall of the water tank 2, the small hole 10 needs to be sealed by the seal member 16, so that the number of parts increases and the seal member 1
6 deteriorates, the sealing performance decreases, and the water tank 2
There was also a problem that the water 18 inside leaked. Further, in the actuator 7 composed of a solenoid, it is difficult to obtain a large driving force (several tens of kg or more), so that it is necessary to provide the pressure equalizing pipe 16 in order to reduce the driving force when switching from the valve closed state to the valve open state. is there. Therefore, water tank 2
There was a problem that the work of attaching to the device was more troublesome and time-consuming.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems. It is an object of the present invention to provide a water tank which is simple in structure, has a small number of parts, is small, and can be easily attached to the water tank. An emergency shut-off valve is provided. Another object of the present invention is to provide an emergency shutoff valve for a water tank that can drive a driving device to stop the water outlet even when commercial power is cut off.

[0007]

In order to achieve the above object, an emergency shut-off valve for a water tank according to the present invention is provided at a water outlet of a water receiving tank, an elevated water tank or the like for storing tap water by activating a seismic sensor when an earthquake occurs. In a water tank emergency shutoff valve, a tubular valve body attached to the bottom of the water tank and forming a water outlet of the water tank, and one end protruding into the water tank so as to be axially movable into the valve body. A supported valve stem, a valve body provided at one end of the valve stem and held in a normally open state, and driving the valve stem by a commercial power supply or an auxiliary power supply in the event of an earthquake to drive the valve body out of the water outlet. And a control circuit for operating the drive device based on a detection signal when the seismic sensor detects an earthquake of a certain seismic intensity or higher, and the control circuit drives the auxiliary power supply when a power failure occurs. Features connection to equipment To. Further, the present invention is characterized in that the driving device is a DC motor.

In the present invention, since the valve stem is incorporated in the valve body, the valve itself can be reduced in size and the installation space can be reduced. In addition, the water tank can be mounted from outside, thereby facilitating the mounting operation. The drive is
For example, a DC motor can drive the valve stem with a large driving force, eliminating the need for a pressure equalizing tube. The control circuit drives the driving device when the seismic sensor detects an earthquake of a predetermined intensity or more, and the valve element closes the water outlet and stops water. Further, the control circuit connects the auxiliary power supply to the drive device when the commercial power supply is outaged due to some kind of accident such as disconnection of the electric wire. Therefore, the shut-off valve can be closed even during a power failure, and can be opened by reversing the DC motor.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings. 1 is a sectional view showing an embodiment of an emergency shutoff valve for a water tank according to the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is an enlarged sectional view taken along line III-III of FIG. 4 is an enlarged sectional view taken along the line IV-IV in FIG. In the drawings, components and the like shown in the section of the prior art are denoted by the same reference numerals, and the description thereof will be omitted as appropriate.

In these figures, the shutoff valve 20 includes a valve body 4 which is provided through a wall near the bottom of the water tank 2 and whose inner open end forms the water outlet 3. The valve body 4 is formed of a straight pipe, fitted from the outside into a mounting hole 19 provided in the water tank 2, and fixed by welding. Further, a flange 21 is provided integrally on the outer periphery of the valve body 4 near the water tank 2, and the flange 21 is closely contacted with the outer peripheral surface of the water tank 2 and is fixed by bolts or the like (not shown). Further, a flange 22 is integrally provided at an end of the valve body 4 opposite to the water tank 2, and the flange 22 is provided with a manual water shutoff valve 14.
Is connected to the flange 23 of the water supply pipe 15 having

An axially movable valve rod 11 is disposed in the valve body 4 near the water tank 2 so that the valve rod 11 can move substantially in the axial direction. The end of the valve rod 11 on the side of the water tank 2 usually projects from the valve body 4 into the water tank 2, and a valve body 6 for controlling the opening and closing of the water outlet 3 is attached to the projecting end so as to be able to swing slightly and rotatably. I have.

The valve body 6 attached to the valve rod 11 so as to be slightly swingable has a disk-shaped plate 24 having an outer diameter substantially equal to the outer diameter of the valve body 4, and faces the valve body 4 of the plate 24. It is composed of a sealing member 26 made of rubber or the like and a pressing plate 27 fixed together by a plurality of bolts 25 on the surface to be fixed. The seal member 26 is formed in a ring shape whose outer diameter is substantially the same as the outer diameter of the plate 24, and has a hole 28 in the center. The holding plate 27 is formed in a ring shape having an outer diameter smaller than the inner diameter of the valve body 4, and has an insertion hole 29 in the center where the valve rod 11 is loosely inserted with an appropriate gap therebetween. 24 together. Valve stem 11
Of the valve body 6 constitutes a male screw portion 30 and is inserted together with the nut 31 into the hole 28 of the sealing member 26 while preventing the valve body 6 from falling off from the valve shaft 11. This prevents the valve element 6 from slightly swinging. In order to attach such a valve element 6 to the valve rod 11,
The holding plate 27 is fitted on the valve stem 11 in advance, and the nut 31 is screwed into the male screw portion 30. Thereafter, the male screw portion 30 and the nut 31 are inserted into the hole 28 of the seal member 26. Next, the sealing member 26 and the holding plate 27 may be fixedly fastened to the plate 24 by bolts 25. The reason why the valve element 6 is attached to the valve rod 11 so as to be able to swing slightly is that the sealing member 2 is closed when the valve is closed.
This is to ensure that the entire surface of the water outlet 6 is brought into close contact with the water outlet 3 to completely stop the water.

Further, a cylindrical bearing member 33 for slidably supporting the valve rod 11 is disposed inside the valve body 4. On the outer periphery of the bearing member 33, for example, three mounting plates 33 </ b> A extending long in the axial direction are equally arranged in the circumferential direction and integrally protruded, and the tips are joined to the inner wall of the valve body 4. . Rings 34 for guiding the valve rod 11 are incorporated near both ends of the bearing member 33.

A cylindrical mounting portion 37 communicating with the inside of the valve body 4 is integrally formed above a portion of the outer peripheral surface of the valve body 4 corresponding to an end of the valve rod 11 opposite to the water tank 2 side. And a flange 37 integrally provided at an upper end of the mounting portion 37.
A drive device 38 for moving the valve rod 11 forward and backward on A is fixed via a case 39. The attachment portion 37 is provided outside the water tank 2 as a matter of course.

The driving device 38 drives the valve stem 11 to drive the valve body 1 when an earthquake having a predetermined seismic intensity or more occurs.
For example, a conventional DC motor 40 and a reduction gear mechanism 41 for reducing the rotation of the DC motor 40 are provided. In addition, the rotation of the drive motor 40 is transmitted via the reduction gear mechanism 41 to rotate a required angle (for example, 90 °) and rotate the valve stem 1.
1 and a swingable lever 43 for converting the rotation of the drive shaft 42 into a linear motion of the valve rod 11.
It has.

As the reduction gear mechanism 41, for example, a worm 44 and a worm wheel 45 are used. Since the worm 44 and the worm wheel 45 have a reverse rotation preventing function, the drive shaft 42 does not rotate even if the lever 43 receives a force in the closing direction due to the water 18 flowing in the valve body 4.
The valve element 6 can be stably held at the fully open position. The drive shaft 42 is housed in a housing 47 together with the reduction gear mechanism 41,
And is inserted into the case 39.
The drive shaft 42 is provided eccentrically from the center of the valve body 4 as shown in FIG. 2, and the lower end is connected to the upper end of the lever 43 via a crank 49.

The lever 43 has the crank 4 at its upper end.
A horizontal shaft 50 orthogonal to the axis of the valve stem 11 is provided at an intermediate portion in the longitudinal direction, integrally having a spherical head 43A slidably held by the shaft 9. The shaft end of this shaft 50 is
It is supported by the case 39. The lower end of the lever 43 is bifurcated as shown in FIG. 2, and the small-diameter portion 11A of the valve stem 11 is inserted into the branch 43B. The crank 49 is, as shown in FIG.
And the bent portion is fixed to the lower surface of the drive shaft 42, and the spherical head 43 of the lever 43 is formed by a groove 49B.
A is rotatably held. Note that the lever 43 is located on the axis of the valve stem 11.

The case 39 is tightly fitted on the flange 37A via an O-ring and fixed by bolts 55, and is fitted into the upper opening of the lower case 39 via the O-ring. The upper case 39B is fixed by bolts 56. At the lower part of the lower case 39, the valve stem 11
Two lever mounting portions 52 facing each other in a direction orthogonal to the axial direction of the shaft 50 are integrally provided, and a shaft hole 51 that supports the shaft 50 is formed in these lever mounting portions 52.

FIG. 5 is a block diagram showing an electric circuit of the shut-off valve having the above configuration. 60 is a commercial power supply (AC100
V) and 61 are A / D converters for converting an alternating current from a commercial power source 60 to a direct current, and 62 is an auxiliary power source, which is composed of, for example, two storage batteries of 12V. When a storage battery is used as the auxiliary power supply 62, a control circuit 64 described later and the storage battery may be connected in parallel to the commercial power supply 60. 63 is a seismic sensor for detecting an earthquake, 64 is a control circuit of the shutoff valve 20,
It is connected to the commercial power supply 60 via the A / D converter 61 and to the auxiliary power supply 62, and normally operates by energization from the commercial power supply 60. When the commercial power supply 60 is cut off for some reason, the auxiliary power supply 62 are configured to be automatically connected. When the seismic sensor 63 detects an earthquake, the control circuit 64 turns on the earthquake detection lamp 65 to indicate that an earthquake has occurred, and detects an earthquake having a predetermined vibration or more (for example, seismic intensity 5). Then, based on the detection signal, the drive device 38 of the shut-off valve 20 is connected to the commercial power supply 60 (the auxiliary power 62 at the time of power failure) to operate, and the indicator lamp 66 of the shut-off valve 20 is turned on. Informs that the valve has closed. Although two shutoff valves 20 are shown in FIG. 5, the number corresponds to the size or number of the water tank 2.

Next, the operation of the shut-off valve 20 having the above configuration will be described. The shut-off valve 20 is normally kept in an open state indicated by a solid line in FIG. 1, that is, in a state where the valve body 6 is separated from the water outlet 3 and opened. Therefore, the water 18 in the water tank 2
Is supplied to the water supply pipe 15 through the valve body 4. In this valve open state, the driving device 38 is kept in the OFF state. The control circuit 64 is connected to the commercial power supply 60 via the A / D converter 61.

When the seismic sensor 63 detects an earthquake having a seismic intensity equal to or higher than a predetermined seismic intensity, the control circuit 64 controls the driving device 3 based on the detection signal.
8 is driven. The drive device 38 drives the drive shaft 4
1 is rotated counterclockwise in FIG. 1 by a predetermined angle, whereby the lever 43 is rotated clockwise about the shaft 50 as shown by a two-dot chain line in FIG. And the valve 6 is seated on the water outlet 3. Therefore, the water tank 2 is stopped by the shutoff valve 20. After stopping the water, the shutoff valve 20 can be opened by reversing the DC motor 40.

After the earthquake, in order to confirm the safety, release the water shutoff state of the shutoff valve 20 and resume the supply of the water 18, the control circuit 64 operates the switch (not shown) to invert the driving device 38. Drive and open the water outlet 3. When the commercial power supply 60 is damaged and the power is cut off, the auxiliary power supply 62 is connected to the drive device 38 by the control circuit 64 to drive the drive device 38. After the shut-off valve 20 is opened, control is performed so that the driving device 38 is turned off.

In the shut-off valve 20 having such a structure, since the valve rod 11 is incorporated in the valve main body 4, the valve itself can be downsized compared to the conventional shut-off valve shown in FIG. And the installation space can be reduced. Further, the valve rod 11 having the valve element 6 in advance and the driving device 38
Since the valve main body 4 can be attached to the water tank 2 in a state where is attached, the attaching operation is easy and can be installed in a short time. Further, a DC motor 40
, The valve rod 11 can be driven with a larger driving force than a solenoid. Therefore, FIG.
It is not always necessary to use the pressure equalizing tube 13 shown in (1), and the valve itself can be further simplified, downsized, and assembly workability can be further improved.

Further, since the valve element 6 is attached to the valve rod 11 so as to be slightly oscillating, the mounting accuracy on the valve rod 11 is not required, and the valve element 6 is securely connected to the water outlet 3 when the valve is closed. Can be tightly closed to stop water. Therefore, the valve has excellent water stopping properties,
Water leakage can be prevented.

Further, since the drive device 38 is normally kept in the OFF state and is driven by energization only when the shutoff valve 20 is opened or closed, a power saving type shutoff valve can be provided.

If the conventional shut-off valve shown in FIG. 6 is closed at the time of a power failure, the water 18 in the water tank 2 cannot be used until the power failure is resolved, which causes a problem in daily life. However, in the present invention, since the auxiliary power supply 62 is provided, even when the commercial power
Can be opened, and the above-mentioned conventional problem can be solved.

In the above-described embodiment, an example is shown in which the valve element 6 is held at the valve-opening position by the driving device 38. However, the present invention is not limited to this, and the valve-opening position may be held using a spring. It may be.

[0028]

As described above, the emergency shutoff valve for a water tank according to the present invention is a water tank emergency shutoff valve for shutting off a water outlet such as a receiving tank for storing tap water and an elevated water tank when an earthquake occurs. In the shut-off valve, a cylindrical valve body attached to the bottom of the water tank and forming a water outlet of the water tank, and a valve stem protruding one end into the water tank and supported movably in the axial direction in the valve body. A valve element provided at one end of the valve rod and held in a normally open state, and a driving device for driving the valve rod by a commercial power supply or an auxiliary power supply to seat the valve element at the water outlet when an earthquake occurs. A control circuit for operating the driving device based on the detection signal when the seismic sensor detects an earthquake of a certain seismic intensity or higher, the control circuit connecting the auxiliary power supply to the driving device in the event of a power failure. Downsizing of the valve itself Thereby enabling simplification and, easy mounting operation to the water tank can be attached in a short period of time. Further, since a large driving force can be obtained, the pressure equalizing tube is not required, and the valve itself can be further simplified, downsized, and the assembling workability can be further improved.

Further, since the present invention is provided with the auxiliary power supply, the shut-off valve can be opened and closed even in the event of a commercial power failure, and the driving device is normally kept in the OFF state, and the cut-off valve is opened. Alternatively, since it is driven only when the valve is closed, it consumes less power and is economical.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of an emergency shutoff valve for a water tank according to the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is an enlarged sectional view taken along line III-III of FIG. 1;

FIG. 4 is an enlarged sectional view taken along the line IV-IV of FIG. 1;

FIG. 5 is a block diagram of an electric circuit.

FIG. 6 is a sectional view showing a conventional example of a shut-off valve.

[Explanation of symbols]

2 ... water tank, 3 ... water outlet, 4 ... valve body, 6 ... valve, 20 ...
Shut-off valve, 38 ... Drive device, 41 ... Reduction gear mechanism, 42 ...
Drive shaft, 43 lever, 60 commercial power supply, 62 auxiliary power supply, 63 seismic sensor, 64 control circuit.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Yujiro Nishi 2480 Mado, Hiratsuka-shi, Kanagawa Prefecture Inside the Hiratsuka Plant of Mitsubishi Plastics Corporation

Claims (2)

[Claims] 1. An emergency shutoff valve for a water tank for shutting off a water outlet of a water receiving tank, an elevated water tank, or the like by operating a seismic sensor in the event of an earthquake, wherein the water tank is provided near a bottom of the water tank and has a water outlet. A cylindrical valve body to be formed, a valve stem protruding one end into the water tank and supported in the valve body so as to be movable in the axial direction, and provided at one end of the valve stem and held in a normally open state. A driving device that drives the valve stem by a commercial power supply or an auxiliary power supply in the event of an earthquake to seat the valve body at the water outlet,
A control circuit for operating the drive device based on the detection signal when the seismic sensor detects an earthquake of a certain seismic intensity or higher, wherein the control circuit connects the auxiliary power supply to the drive device when a power failure occurs. Emergency shutoff valve for aquarium. 2. The emergency shutoff valve for a water tank according to claim 1, wherein the driving device is a DC motor.