JP2998355B2 - Gas 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 a gas shut-off valve device which electrically performs an open / return operation.

[0002]

2. Description of the Related Art In recent years, city gas supply companies and the LP gas supply industry have been using gas meters for measuring gas usage in order to ensure safety and security of gas usage under administrative guidance. A device incorporating a gas shut-off valve device for shutting off air is being spread.

This gas shut-off valve device is generally installed outdoors because it is built in a gas meter, and when an abnormality occurs in a room where gas is used, the gas passage is shut off. It was inconvenient to go out and perform it manually, and there has been an increasing demand for users to be able to remotely control from indoors. For this reason, a gas shut-off valve device has been devised which electrically opens and returns the shut-off valve by remote control.

FIG. 2 shows an embodiment of a conventional gas shut-off valve device. A magnetic plunger 4 has a valve portion 5 fixed at one end, a coil 61 and a coil bobbin 6 supporting the coil.
2 is slidably inserted into an electromagnetic coil 6 made of the same.
The other end of the insertion portion is coaxially opposed to the core piece 3 supported by the permanent magnet 2 fixed to the yoke 1, and is urged by a spring 8 toward the valve seat 9. The yoke 1 is hermetically attached to the gas passage A. The figure shows the open state of the valve portion 5, the plunger 4 excites the core piece 3 by the magnetic field excited by the permanent magnet 2, and the magnetic force of the core piece 3 is larger than the repulsive force of the gas spring 8.
The plunger 4 is attracted to the core piece 3 and is held by itself.

Next, an operation of shutting off the gas passage A based on the above configuration will be described. A closed current I ₁ flows closure current I ₁ to the electromagnetic coil 6 is excited electromagnetic coil 6 to the magnetic field of the magnetic field in the opposite direction from the permanent magnet 2. The plunger 4 and the core piece 3 are separated from each other by the opposite magnetic field, and the valve portion 5 comes into close contact with the valve seat 9 to shut off the gas passage A. Even when the closing current I ₁ is cut off, the plunger 4 is separated from the core piece 3, so the attraction force of the plunger 4 by the magnetic force of the core piece 3 is weak, and re-adsorption cannot be performed. Keep the cut-off state in close contact.

The operation of reopening the gas passage A which has been shut off will now be described. When flow opening current I ₂ of the closure current I ₁ and the opposite direction to the electromagnetic coil 6, the electromagnetic coil 6 for exciting the magnetic field of the magnetic field in the same direction as the permanent magnet 2. Further, the opening current I ₂ is made larger than the closing current I ₁ and the electromagnetic coil 6
And the two magnetic forces generated by the permanent magnet 2 overcome the repulsive force of the spring 8, and the plunger 4 moves downward and is attracted to the core piece 3 to open the gas passage A. Once the plunger 4 adsorbed is adsorbed and held by the magnetic force of the permanent magnet 2 on core pieces 3 in the repulsive force greater suction force of the spring 8, it is not necessary to continuously flow the subsequent opening current I _2. The respective energized states when the gas passage A is shut off and opened are as shown in the dashed line frame.

[0007]

In order to close the conventional gas shut-off valve which opens and returns electrically, a magnetic force enough to break the lance of the spring 8 and the permanent magnet 2 is sufficient. The current was small, and the capacity of a power supply (not shown) using a battery was also small. However, in order to open the gas shutoff valve, a magnetic force is required to move the plunger 4 at a position beyond the attraction force of the permanent magnet 2 downward against the repulsive force of the spring 8. For this reason, the electromagnetic coil 6 requires a larger operating current than at the time of shut-off. On the other hand, the power supply must have long-term durability, economical efficiency, and space saving for reducing the space for storing the power supply. As a result, the force that can be used to open and return the gas shut-off valve must be reduced to the minimum necessary.

For this reason, when the rubber material of the valve body and the valve seat adhere to each other due to a chemical reaction while the gas shut-off valve is closed for a long period of time, or due to moisture contained in the gas in a cold region, the valve body and the valve are closed. There was a problem that the seat solidified and the gas shutoff valve could not be opened and the gas passage could not be opened and returned.

Accordingly, the present invention is to solve such a conventional problem and to provide a gas shut-off valve which can be reliably opened and returned.

[0010]

In order to achieve the above object, the present invention provides a shut-off valve for shutting off and opening a gas passage by an electromagnetic coil, and a power supply capacitor for supplying a discharge current to the gas shut-off valve. A power supply for supplying power, a power supply booster for receiving the power from the power supply and charging the power supply capacitor, a switching unit for switching charging and discharging of the power supply capacitor, and receiving a measurement signal of gas flowing through the gas passage. Control means for supplying a current from the power supply to the gas cutoff valve in a direction different from the power supply to the power supply capacitor, receiving a valve opening signal for opening and restoring a gas passage, and outputting a switching instruction signal to the switching means; A valve opening detection means for detecting the opening and closing of the valve, a valve opening state is determined by the valve opening detection means, and a valve opening signal is sent to the control means again when the shutoff valve is not returned to the open state. Those having a valve opening determining section that gives a signal that boosts instructing a voltage higher a predetermined value than the voltage value previously set to the voltage step-up unit to re-return voltage setting unit as well.

[0011]

According to the present invention, according to the present invention, the control means, which has received the gas metering signal, energizes the gas shutoff valve from the power supply when the signal is abnormal, thereby shutting off the gas passage. On the other hand, when the control means receives the valve opening signal, it provides a switching instruction signal to the switching means. Then, the switching means supplies power from the power supply to the power booster, and causes the power booster to charge the power supply capacitor and then discharge. This discharge current is supplied to the gas cutoff valve in a direction different from the direction at the time of the current supply, and the gas passage is released to be released and returned to the open state.

When the valve is stuck to the valve seat and the gas shut-off valve does not open, the valve-opening judging unit, which has detected that the valve has not been opened by the valve-opening detecting means, sends a valve-opening signal to the control means again. And sends a signal to the re-recovery voltage setting unit to instruct the re-recovery voltage setting unit to boost the voltage by a predetermined value higher than the previously set voltage value. The control unit that has received the valve opening signal again provides a switching instruction signal to the switching unit, and the switching unit supplies power to the power supply boosting unit, causes the power supply boosting unit to charge the power supply capacitor at a voltage higher than the previous time, and then discharges. . This discharge current is supplied to the gas shut-off valve in the same direction as that at the time of the previous discharge, and a larger valve opening force is applied to the gas shut-off valve to open and return the fixed valve element.

If the valve cannot be opened again, the above-described reopening operation is repeated until the valve is opened.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the gas shut-off valve device of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of a gas shut-off valve device according to the present invention. Components denoted by the same reference numerals as those of the conventional example have the same names and the same functions, and a detailed description thereof will be omitted. Next, the different parts will be described. The current is applied to the electromagnetic coil 6 by the control circuit unit C. Control circuit section C
The control means 10 receives a metering signal sent from a metering device of a gas meter (not shown), a remote operation unit (not shown), and a valve opening signal from a valve opening determining unit (to be described later),
2. Switching means 10 for selecting the respective circuits at the time of breaking and opening and switching the breaking current and the opening current flowing to the electromagnetic coil 6
0, a power supply capacitor 30 serving as a power supply for an open current;
Power supply booster 40 for charging the current boosted to 0, valve body 5
The valve opening detecting means 70 for detecting the opening and closing of the valve, when the valve opening detecting signal is received from the valve opening detecting means 70 and the valve is not opened,
Valve opening determination unit 50 for performing a restart valve operation, the power supply boosting unit 4
A reset voltage setting unit 60 for determining a rising voltage value of 0 is provided.

Next, an operation of shutting off the gas passage A by the above configuration will be described. When the gas is abnormally used, the control means 10 determines a weighing signal sent from a weighing device of a gas meter (not shown), and when this signal is abnormal, a current is supplied from the power supply 102 to the switching means 100 and the electromagnetic coil 6 to control such flow closure current I ₁ it is. Therefore this closure current I ₁ as described above is to cut off the gas passage A by operating the gas cutoff valve G.

Next, when the valve opening signal is input from a remote control unit (not shown) to the control means 10, the control means 10 opens the shut off gas passage A.
The switching operation is controlled to supply a current from the power supply 102 to the power supply boosting unit 40 and charge the power supply capacitor 30 with the voltage boosted via the power supply boosting unit 40. wherein the closing current I ₁ is controlled so as to be discharged as opening current I ₂ in the reverse direction. And this opening current I ₂ as described above to open the return gas path A that has been blocked by operating the gas cutoff valve G.

A description will now be given of the valve reset operation of the control circuit section C in the case where the gas shut-off valve G is not opened and the gas passage A cannot be opened and returned because the valve body 5 is fixed to the valve seat 9. The valve body 5 and in a normal state in which the valve seat 9 is not fixed in the cutoff state, the electromagnetic coil 6 and the permanent magnet 2 electromagnetic coil 6 excites the magnetic field of the opening current I ₂ receiving the permanent magnet 2 field in the same direction The two magnetic forces generated by the springs overcome the repulsive force of the spring 8, the plunger 4 moves downward and is attracted to the core piece 3, and the gas shutoff valve is opened. However, in an abnormal state in which the valve element 5 is stuck and adhered to the valve seat 9, the energy required for opening the valve increases. Specifically, the spring 8
In addition to the repulsion force, a release force required to release the valve element 5 fixed to the valve seat 9 from the valve seat 9 is applied, so that the opening current I ₂ excites the electromagnetic coil 6 and a permanent magnet. 2
Cannot overcome the repulsive force and the detaching force with the two magnetic forces generated by, the plunger 4 cannot be sucked and fixed to the core piece 3 by suction, and the gas shutoff valve G cannot be opened. Here, the valve opening detecting means 70 detects the valve opening / closing state of the valve element 5 and the valve opening determining section 5
A signal is sent to 0 to notify that the valve body 5 is not open. In response to the fact that the valve element 5 has not been opened, the valve-opening determining section 50 sends the valve-opening signal H to the control means 10 again, and sets the reset voltage setting section 60 to a voltage higher than the boosted voltage set at the time of the previous discharge. Send the signal to be set. Valve opening determination unit 5
Receiving the signal for increasing the set boosted voltage from 0, the reset voltage setting unit 60 transmits the signal to the power boosting unit 40 to increase the voltage by a predetermined voltage value from the previous discharge. On the other hand, the control means 10 which has received the valve opening signal again controls the switching operation of the switching means 100 in the same manner as described above, and the power supply 10
2, a current is supplied to the power booster 40, and the power booster 40
After charging the power supply capacitor 30 with a voltage boosted by a predetermined value higher than the time of the previous discharge via the power supply, the charged current flows in the electromagnetic coil 6 in the same direction as the previously-discharged open current I _2. In addition, control is performed so as to discharge as an open current I ₂ ′ whose voltage is higher by a predetermined value than I ₂ .

The electromagnetic coil 6 which has received the open current I ₂ ′ boosted higher than the open current I ₂ discharged last time is in the same direction as the magnetic field generated by the permanent magnet 2 and has the open current I ₂ received last time.
₂ generates a magnetic field stronger than the magnetic field generated and generates a stronger magnetic force than the previous discharge. Here, the electromagnetic coil 6 and the permanent magnet 2
When the magnetic force generated by the plunger exceeds the repulsive force of the spring 8 and the release force required to release the valve element 5 fixed to the valve seat 9 from the valve seat 9, the plunger 4 is sucked and fixed to the core piece 3 by suction. The shutoff valve G is opened, and the shutoff passage A is opened and returned. If not exceeded, the open current boosted to a higher voltage than the previous discharge is repeatedly applied to the electromagnetic coil 6 in the same procedure as described above, and finally the valve element 5 fixed to the valve seat 9 is released to release the gas shutoff valve G Is operated to open and return the blocked gas passage A.

[0020]

As is apparent from the above description, the gas shut-off valve device of the present invention detects the failure of opening the shut-off valve and opens the open current having a higher voltage than the previous discharge at the time of the restart valve operation. Since the shut-off valve is energized repeatedly until it is opened,
The opening / returning operation for releasing the shutoff of the gas passage based on the valve opening signal of the opening / returning operation can be reliably realized.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of a gas shut-off valve device of the present invention.

FIG. 2 is a configuration diagram showing a conventional gas shut-off valve device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Control means 40 Power supply boosting part 50 Valve opening determination part 60 Re-return voltage setting part 70 Valve opening detection means 100 Switching means G Gas cutoff valve

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16K 31/06 310 F16K 31/06 380

Claims (1)

(57) [Claims] 1. A gas shutoff valve for shutting off and opening a gas passage by an electromagnetic coil, a power supply capacitor for supplying a discharge current for opening the gas shutoff valve, a power supply for supplying power, and a power supply for the power supply. A power booster that receives and charges the power supply capacitor, a switching unit that switches charging and discharging of the power supply capacitor, receives a measurement signal of gas flowing through a gas passage, and supplies the gas shutoff valve with the gas shutoff valve from the power supply. Control means for energizing in a direction different from the energizing of the condenser, receiving a valve opening signal for opening and returning the gas shutoff valve and outputting a switching instruction signal to the switching means, and valve opening detection for detecting opening and closing of the shutoff valve Means and a valve open state is determined by the valve open detecting means, and when the shutoff valve is not opened and returned, a valve opening signal is sent again to the control means and the voltage value previously set in the reset voltage setting section is used. Gas cut-off valve device having a valve opening determining section that gives a signal that boosts instructing a voltage higher a predetermined value to the voltage booster.