JP2001289343A - Emergency cutoff valve and emergency cutoff valve group - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the simplicity of a driving source, secureness of the transmission of various signal, prevention of the wrong operation and facilitation of the check in a field in the normal operation of an emergency cutoff valve by eliminating a problem of a conventional emergency cutoff valve in secureness that the lock is easy to be released by even the force except for the external force by the solenoid because of the structure of the conventional emergency cutoff valve that a driving source thereof is a weight and that the solenoid is operated by the signal detected by a seismoscope when an earthquake happens and the lock is released so as to lower the weight for operation, and by coping with the wrong operation. SOLUTION: This invention is related to an emergency cutoff valve formed by integrally providing a valve with an actuator for opening and closing that valve and to be opened and closed while sensing the earthquake. A control circuit substrate, a valve opening and closing direct current motor, an automatic horizontal adjustment type seismoscope and a storage battery are provided in the actuator, and while a field operation display unit is integrally provided. Furthermore, besides the primary operation of a switch for commanding the closing of the valve in the field operation display unit, the secondary operation for preventing the wrong operation is added to this switch.

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, and more particularly to an emergency shutoff valve that opens and closes a valve by driving an actuator based on a signal from a seismic sensor that senses an earthquake.

[0002]

2. Description of the Related Art Conventionally, various types of emergency shut-off valves have been used, but those in which a seismic sensor and a battery are provided in a control panel and the control panel is integrally provided with a valve body. Is disclosed in JP-A-9-242918. In this apparatus, a valve is closed by a weight, and when an earthquake is detected by a seismic sensor, a solenoid is actuated by the signal to unlock the weight, and the valve is closed by lowering the weight.
In addition, in order to open the valve, it is necessary to manually raise the weight and return it to the lock position, and the operability is not easy.

[0003]

The emergency shut-off valve does not operate normally, and it is required that the emergency shut-off valve operate reliably during an earthquake when it is not known when it will occur. Therefore, the emergency cutoff valve is required to have a simple drive source, reliable transmission of various signals, prevention of negligence operation, and simplicity of on-site inspection in normal times.
However, the emergency shut-off valve described above is driven by a weight, and when an earthquake is detected by a seismic sensor, the signal activates the solenoid and releases the lock holding the weight, causing the weight to descend and operate. However, there is a problem in reliability such that the lock is easily released by other than the external force generated by the solenoid. There is no description on measures to prevent accidental operation.

The present invention solves the above-mentioned problems, simplifies the ordinary inspection work by simplifying the driving source of the valve, and enables the valve to be opened and closed at the site in a normal state and the valve operation at the site in an emergency. An object of the present invention is to provide an emergency shutoff valve which can be easily performed and can prevent erroneous operation.

[0005]

SUMMARY OF THE INVENTION The present invention relates to an emergency shut-off valve which integrally includes a valve and an actuator for opening and closing the valve, and detects an earthquake to open and close the valve. And a DC motor for opening and closing the valve, an automatic leveling type seismic sensor and a storage battery, and an on-site operation display unit integrated with the actuator. And an on-site operation display unit including a switch for instructing valve closing and opening operation, and a switch for instructing valve closing on the on-site operation display unit. Is characterized by adding a secondary operation to prevent negligence operation in addition to the primary operation, and furthermore, the storage battery is an electric double layer capacitor Further, the battery is charged only when the voltage of the electric double layer capacitor drops to a predetermined value.Furthermore, a pendulum and a concave portion are provided in the actuator, and the pendulum is provided so as to face the concave portion. ,
It is characterized in that the diameter of the recess is set so that the pendulum contacts the edge of the recess within a range of less than the allowable inclination of the automatic leveling type seismic sensor, and furthermore, for opening and closing the valve and the valve An emergency shut-off valve group that integrally provides an actuator and opens and closes the valve when an earthquake is detected.The actuator includes a control circuit board, a DC motor for opening and closing the valve, an automatic leveling type seismic sensor, and a storage battery. At least one secondary emergency shut-off valve, which opens and closes only when instructed by the main emergency shut-off valve, is electrically connected to the main emergency shut-off valve provided with the local operation display unit integrated with the actuator. It is assumed that.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The emergency shut-off valve does not normally operate, and must be reliably operated during an earthquake when it is not known when it occurs. Since the emergency shut-off valve of the present invention is provided with an on-site operation display unit integrally with the actuator, it is possible to easily check the mechanical operation of the valve during normal inspection, and to visually check the surroundings of the valve in an emergency. Thus, a return operation can be performed on the spot, and the valve can be operated on the spot even when cleaning the water tank provided with the emergency shutoff valve.

Further, in the emergency shut-off valve of the present invention, the switch for instructing valve closing attached to the on-site operation display unit is provided with a predetermined operation for preventing an accidental operation.
For example, the valve will not be closed by an accidental operation such as when something hits or when the child presses the valve closing switch for prank.

Further, the emergency shut-off valve of the present invention incorporates an electric double layer capacitor (hereinafter referred to as a storage battery) as a backup power supply in the event of a power failure. Power for operating the display unit and the on-site operation display unit is also supplied from the storage battery. If the seismic device and the on-site operation display unit are installed far away from the shut-off valve, a relatively long signal wiring and electrical wiring connecting them are required. This is cut off under the influence of the earthquake, which raises the fear that the emergency shut-off valve will not work. However, in the emergency shut-off valve of the present invention, since the storage battery, the seismic sensor, and the on-site operation display unit are integrally mounted in the actuator and on the actuator cover, even if an earthquake occurs, signal wiring and electric wiring are thereby performed. There is no danger of disconnection, so that the storage battery in the actuator allows it to operate independently and insulated from external conditions.

Further, the seismic device used for the emergency shutoff valve of the present invention has an automatic leveling function because the seismic element is floated in, for example, an oil bath. Therefore, even if the mounting angle of the emergency shut-off valve or the seismic sensor is slightly inclined with respect to vertical or horizontal, it can be operated accurately, so that the mounting of the emergency shut-off valve can be slightly inclined and the mounting work is easy. become.

Next, an embodiment of the emergency shutoff valve of the present invention will be described with reference to the drawings. FIG. 1 is an overall elevation view of the emergency shut-off valve of the present invention, and FIG. 2 is a side view of FIG. FIG. 3 is a layout view of the inside of the actuator of the emergency shut-off valve of the present invention, FIG. 4 is a schematic circuit diagram of the inside of the actuator, and FIG. 5 is a front view of a field operation display unit according to the present invention. In the figure, 1 is a valve body, 2 is an actuator, and a field operation display unit 3 is mounted on the outer surface of the actuator 2. The valve body 1 includes a valve box 11, a valve body 12, and a valve rod 13. The valve rod 13 is connected to the actuator 2, and is controlled by a DC motor (described later) in the actuator 2.
To open and close. The valve body 12 uses a segment type ball valve that has only a portion that contacts the seat in a spherical shape. The valve operation torque does not increase even if the valve is held open for a long period of time, ensuring the valve operation reliability. are doing. As shown in FIG. 3, a DC motor 4, a storage battery 5, a control circuit board 6, and a seismic sensor 7 mounted on the control circuit board 6 are arranged in the actuator 2, and the DC motor 4 is connected via a reduction gear mechanism. To the output shaft 8. An automatic leveling type is used for the seismic sensor 7.
It has an automatic centering function for inclinations up to 0 degrees.

FIG. 4 is a schematic circuit diagram of the inside of the actuator 2. The control circuit board 6 includes a CPU, a motor driving circuit, a power failure detection circuit, and a voltage detection circuit, and is connected to the seismic sensor 7, the DC motor 4, and the on-site operation display unit 3. The CPU in the control circuit board 6 receives the vibration detection signal from the seismic sensor 7 and determines whether or not it is an earthquake. If it is determined that it is an earthquake, instructs the motor drive circuit to drive the motor. The main role. In addition to operating a charging circuit with a DC power supply connected to a commercial power supply, a control power supply for operating a CPU or the like through the DC / DC power supply is obtained. Further, it is supplied to the storage battery 5 via the charging circuit to charge the storage battery 5. However, when the commercial power supply fails, the power failure detection circuit operates, and the input of the DC / DC power supply is switched to the storage battery 5. The storage battery 5 is always supplied with power to the motor through a motor drive circuit as a power supply for driving the motor. Therefore, even in the case of a sudden power failure or a power failure due to an earthquake, the emergency shut-off valve can be operated without any trouble.

Since the emergency shut-off valve according to the present invention operates only in an emergency, it is necessary to regularly check the operation and visually confirm the appearance during normal times. The emergency shut-off valve of the present invention has the following advantages in the above-described confirmation and the like because the on-site operation display unit is provided integrally with the actuator. B) For inspection purposes, it is necessary to operate the “Shutoff” push button to confirm that there is no problem with the mechanical operation of the valve closing.
In the emergency shutoff valve of the present invention, the operation of the emergency shutoff valve can be easily confirmed at the site where the emergency shutoff valve is installed. B) After an earthquake occurs and the emergency shutoff valve operates and closes,
When trying to open the valve again without damage from the earthquake, it is possible to visually check the condition of the piping around the emergency shutoff valve and open the emergency shutoff valve. In the above situation, if the emergency shut-off valve and the operation panel that is the operating source are located at separate positions, the person who inspects and operates will reciprocate between the emergency shut-off valve and the operating source each time. . However, since the emergency shut-off valve of the present invention has an integral local operation display unit as an operation source, inspection and operation can be easily performed without a person moving.

FIG. 5 is a plan view showing a layout of the on-site operation display unit 3. In the figure, reference numeral 31 denotes an indicator light indicating power supply from a commercial power source, and 32 denotes a shut-off indicator light that lights when the valve is in a "closed" state. Reference numeral 33 denotes an error indicator lamp which is turned on when the operation of the emergency shutoff valve is abnormal. Reference numeral 34 denotes a "cutoff" push button. This “shut-off” push button cannot be closed for a short period of time by a simple push of the primary action, but by a secondary action of holding the “shut-off” push button for 15 seconds. The valve can be "closed". This secondary operation is to prevent the valve from being "closed" due to negligence, such as, for example, something hitting the "blocking" push button 34, or a child mischievously pressing. Alternatively, the push button may be double-clicked. In the conventional emergency shutoff valve, a pushbutton of "shutoff" is generally housed in a lockable operation panel, and the above-mentioned negligence is unlikely to occur, so the function of the secondary operation as in the present invention is not provided. Not provided. 35
Is a "return" push button, which is a switch for opening a valve whose valve is "closed" due to an earthquake or the like when pressed.

The emergency shut-off valve of the present invention uses an electric double layer capacitor as a storage battery. In this storage battery, an electrolytic solution is disposed between positive and negative active carbon, and an interface between the positive active carbon and the electrolytic solution in a charge cycle. Then anions are adsorbed,
Cations are adsorbed at the interface between the negative electrode activated carbon and the electrolyte. Conversely, in the discharge cycle, ions adsorbed on the positive electrode activated carbon and the negative electrode activated carbon move in the electrolytic solution to extract current. This charge / discharge is due to the adsorption of ions and is not due to a chemical reaction as in ordinary storage batteries, so there is no limit to the number of times of charge / discharge.In general storage batteries such as lead storage batteries and nickel cadmium storage batteries, replacement is not possible. While the period is about two to three years, the replacement time of the electric double layer capacitor is as long as about seven years or more, so that the maintenance work can be greatly reduced. The charging time can be determined by the capacity of the electric double layer capacitor and the charging current. In the case of the present embodiment, the charging is completed within 2 minutes, and the charging can be performed more rapidly than a normal storage battery. It also has features that can simplify the charging circuit.

On the other hand, although the electric double layer capacitor is fully charged, it is not preferable in terms of life to keep applying a voltage after that even if it is fully charged. Therefore, a charging circuit is configured to perform intermittent charging. Specifically, the voltage of the electric double layer capacitor is constantly monitored, and when the battery is fully charged, charging is stopped.If the voltage of the electric double layer capacitor drops to a certain value due to spontaneous discharge or the like, a full charge is performed. Recharge until it becomes. FIG. 6 shows the actual state of charge of the electric double layer capacitor. The electric double layer capacitor voltage at the time of full charge was 14.5V, and the electric double layer capacitor voltage at the start of recharging was 13.5V. At this time, the initial charging time is as long as about 2 minutes, but the charging time after the second time is extremely short, about 30 seconds, whereas the discharging time due to spontaneous discharge is actually about 1 hour, As a result, the charging time occupies a very low 0.8%, and the electric double-layer capacitor is a charging method with almost no electrical stress. This method is very effective in extending the replacement time of the electric double layer capacitor. When the electric double layer capacitor is fully charged, the CPU periodically (eg, every three months) connects the electric double layer capacitor to the discharge circuit, and at this time, it is necessary for the voltage of the electric double layer capacitor to decrease to a certain voltage. By measuring the time, it is possible to calculate the actual capacity of the electric double layer capacitor, and from this result, it is possible to notify the replacement time of the electric double layer capacitor.

FIG. 7 schematically shows a level gauge 9 provided in the actuator of the emergency shut-off valve according to the present invention. A weight 93 suspended from a support 91 by a chain 92 faces a recess 94 formed on the floor of the actuator. If the diameter of the concave portion 94 is appropriately selected so that the time when the weight 93 comes into contact with the edge of the concave portion 94 is the permissible inclination limit of the above-described automatic leveling type seismic sensor 7, this is visually observed. This makes it possible to easily determine whether or not the mounting of the emergency shutoff valve is within a proper inclination.

When the emergency shut-off valve of the present invention is used in a water tank such as a water receiving tank, a plurality of emergency shut-off valves are usually used in one water tank. At that time, using the emergency shut-off valve of the present invention as the main emergency shut-off valve, as shown in FIG. 4, using an emergency shut-off valve equipped with only an electric motor, a motor drive circuit, and an opening detection circuit in the actuator, A valve in which all the "close" and "open" of the valve is performed according to the instruction of the main valve of the present invention can also be used as a simple type.

[0018]

According to the present invention, the valve driving source is simple, ordinary inspection work can be simplified, and the valve can be opened and closed at the site in normal times, and the valve can be easily turned on and off in emergency. An emergency shutoff valve capable of easily performing a valve operation and preventing an erroneous operation can be provided.

[Brief description of the drawings]

FIG. 1 is an elevational view and a partial sectional view of an emergency shut-off valve of the present invention.

FIG. 2 is a side view of the emergency shutoff valve of the present invention.

FIG. 3 is a layout view of the inside of an actuator of the emergency shutoff valve of the present invention.

FIG. 4 is a schematic circuit diagram of the inside of an actuator of the emergency shutoff valve of the present invention.

FIG. 5 is a plan view of the on-site operation display unit of the present invention.

FIG. 6 is a diagram showing a charging state of the electric double layer capacitor.

FIG. 7 is an elevation view showing a level gauge provided in the emergency shutoff valve of the present invention.

[Explanation of symbols]

1 Emergency shut-off valve, 2 actuator, 3 local operation display unit, 4 DC motor, 5 storage battery, 6 control circuit board, 7 seismic sensor, 9 level gauge, 12 valve body, 13 valve stem, 34 shut-off push button, 35 return push button

Claims (7)

[Claims] 1. An emergency shutoff valve for integrally opening and closing a valve and an actuator for opening and closing the valve, and detecting an earthquake to open and close the valve. A control circuit board and a DC motor for opening and closing the valve in the actuator. An emergency shut-off valve characterized in that an automatic leveling type seismic sensor and a storage battery are provided, and an on-site operation display unit is integrally provided with the actuator. 2. The emergency shut-off valve according to claim 1, wherein the on-site operation display unit includes an indicator light for displaying a total of a valve closing and an error, and a switch for instructing an operation of the valve closing and the valve opening. 3. The switch for instructing valve closing in the on-site operation display unit is obtained by adding a secondary operation for preventing a negligible operation in addition to a primary operation. 3. The emergency shutoff valve according to any one of 2. 4. The emergency shutoff valve according to claim 1, wherein the storage battery is an electric double layer capacitor. 5. The battery is charged only when the voltage of the electric double layer capacitor drops to a predetermined value.
An emergency shut-off valve according to item 1. 6. A pendulum and a recess are provided in the actuator so that the pendulum faces the recess, and the pendulum is in contact with an edge of the recess within a range of less than an allowable inclination of the automatic leveling type seismic sensor. The emergency shut-off valve according to claim 1, wherein the diameter of the emergency shut-off valve is set. 7. An emergency shutoff valve group integrally provided with a valve and an actuator for opening and closing the valve, and detecting an earthquake to open and close the valve, wherein a control circuit board and a DC for opening and closing the valve are provided in the actuator. A main emergency shut-off valve equipped with an electric motor, an automatic leveling type seismic sensor, a storage battery and an actuator with an on-site operation display unit integrated, and a secondary emergency shut-off that opens and closes only with an instruction from the main emergency shut-off valve An emergency shutoff valve group, wherein at least one valve is electrically connected.