JPH05141563A - Gas cutoff valve device - Google Patents

Abstract

PURPOSE:To securely carry out open/close action for cutting off or releasing a gas passage, in a gas cutoff device in which open/return action is electrically carried out. CONSTITUTION:When a valve-opening judging part 50 detects the valve-opening failure of a gas cutoff valve G, a valve-opening signal H is again transmitted to a control means 10, and also a signal is transmitted to a reset voltage setting part 60. The reset voltage setting part 60 causes a power-supply voltage raising part 40 to raise its voltage to a higher voltage than that at the time of the preceding valve-opening failure as much as a prescribed voltage, so that a power-supply capacitor 30 can be charged. The control means 10 controls the changeover operation of a changing-over means 100 to discharge an opening current of a higher voltage than that at the time of the preceding discharge to an electromagnetic coil 6. In the electromagnetic coil 6, a stronger magnetic field than that at the time of the preceding receiving of power is produced, and the return-open action of a valve body 5 is carried out with a stronger attractive force.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas cutoff 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 a gas meter for measuring the amount of gas used in order to ensure the safety and security of gas use under the guidance of the government. Those incorporating a gas shutoff valve device for shutting off the gas are becoming popular.

This gas cutoff valve device is generally installed outdoors because it is built into a gas meter, and an abnormality occurs indoors using gas to cut off the gas passage, and even if the cause is canceled, a return operation is performed. Since it is inconvenient to go outdoors and perform manual operation, there has been an increasing demand for users to be able to perform remote operation from indoors. Therefore, a gas shutoff valve device has been devised which electrically performs the opening and returning operation of the shutoff valve by remote control.

FIG. 2 shows an example of a conventional gas cutoff valve device. A valve body 5 is fixed to one end of a plunger 4 made of a magnetic material, and a coil 61 and a coil bobbin 6 supporting the coil are shown.
It is slidably inserted in the electromagnetic coil 6 composed of two.
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 biased by the spring 8 toward the valve seat 9. The yoke 1 is airtightly attached to the gas passage A. The drawing shows the open state of the valve portion 5, and the plunger 4 excites the core piece 3 by the magnetic field excited by the permanent magnet 2 and is larger than the repulsive force of the magnetic spring 8 of the core piece 3.
The plunger 4 is attracted to the core piece 3 and self-held.

Based on the above construction, the operation of shutting off the gas passage A will be described next. 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. Due to this reverse magnetic field, the plunger 4 and the core piece 3 are separated from each other, the valve portion 5 is brought into close contact with the valve seat 9, and the gas passage A is shut off. Since the plunger 4 is separated from the core piece 3 even if the closing current I ₁ is cut off, the attraction force of the plunger 4 due to the magnetic force of the core piece 3 is weak, and the re-adsorption cannot be performed. Keep close contact and close.

The operation of reopening the blocked gas passage A will be described. When an opening current I ₂ in the direction opposite to the closing current I ₁ is passed through the electromagnetic coil 6, the electromagnetic coil 6 excites a magnetic field in the same direction as the magnetic field of the permanent magnet 2. Further, the opening current I ₂ is made larger than the closing current I ₁ , and the electromagnetic coil 6
The two magnetic forces created by the permanent magnet 2 overcome the repulsive force of the spring 8, the plunger 4 moves downward and is attracted to the core piece 3, and the gas passage A is opened. The plunger 4 once attracted is attracted and held by the core piece 3 with an attraction force larger than the repulsive force of the spring 8 due to the magnetic force of the permanent magnet 2, and it is not necessary to keep the open current I ₂ flowing thereafter. The respective energized states when the gas passage A is cut off and opened are as shown in the frame of the chain line.

[0007]

In order to close the conventional gas shut-off valve that returns to an electrically open state, it is sufficient if there is a magnetic force such that the lance of the force of the spring 8 and the permanent magnet 2 is broken, and the operation of the electromagnetic coil 6. The current was small and the capacity of the power source (not shown) using the battery was also small. However, in order to open the gas cutoff valve, a magnetic force is required to move the plunger 4 in a position where the attraction force of the permanent magnet 2 does not reach downward against the repulsive force of the spring 8. For this reason, the electromagnetic coil 6 requires a larger operating current than when it is cut off, but on the other hand, the power source must have long-term durability, economical efficiency, and space-saving property for reducing the space for storing the power source. As a result, the force that can be used to open and return the gas cutoff valve must be minimized.

Therefore, when the rubber material of the valve body and the valve seat are chemically reacted and adhered while the gas cutoff valve is closed for a long period of time, or when the valve body and the valve are closed due to water contained in the gas in a cold region. There is a problem that the seat solidifies, the gas cutoff valve cannot be opened, and the gas passage cannot be opened and restored.

Therefore, the present invention solves the above-mentioned conventional problems and provides a gas cutoff valve that can surely return to the open state.

[0010]

In order to achieve the above object, the means of the present invention comprises a shutoff 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 shutoff valve. A power supply for supplying power, a power supply booster for charging the power supply capacitor by receiving the power from the power supply, a switching means for switching charging / discharging of the power supply capacitor, and a metering signal for the gas flowing in the gas passage. Control means for energizing the gas shutoff valve from the power source in a direction different from the energization of the power source capacitor, receiving a valve opening signal for opening and restoring the gas passage, and outputting a switching instruction signal to the switching means; When the valve opening detection means for detecting opening and closing of the valve and the valve opening state of the valve are judged by the valve opening detection means, and when the shutoff valve is not restored to open, a valve opening signal is sent again to the control means. 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, the control means, which has received the gas metering signal, energizes the gas shutoff valve from the power source to shut off the gas passage when the signal is abnormal. On the other hand, when the control means receives the valve opening signal, it gives a switching instruction signal to the switching means. Therefore, the switching means causes the power supply to supply power to the power supply booster, and causes the power supply booster to charge the power supply capacitor and then discharge it. This discharge current is applied to the gas cutoff valve in a direction different from that during the energization to release the cutoff of the gas passage and restore the open state.

When the valve element is stuck to the valve seat and the gas cutoff valve does not open, the valve opening determination unit that detects that the valve opening detection unit has not opened the valve signal to the control unit again. And a signal for instructing to boost a voltage higher than the previously set voltage value by a predetermined value. Upon receiving the valve opening signal, the control means again gives the switching instruction signal to the switching means, and the switching means causes the power source boosting section to supply power, and the power source boosting section charges the power source capacitor with a voltage higher than the previous time and then discharges it. .. This discharge current is applied to the gas cutoff valve in the same direction as the previous discharge, and a larger valve opening force is applied to the gas cutoff valve to open the stuck valve body.

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

[0014]

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

FIG. 1 shows an embodiment of the gas cutoff valve device according to the present invention, in which parts designated 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. The different parts will be described below. The electromagnetic coil 6 is applied with a current by the control circuit section C. Control circuit section C
Is a control means 10 and a power supply 10 for receiving a metering signal sent from a metering device of a gas meter (not shown) and a valve opening signal from a remote operation part (not shown) and a valve opening determination part described later.
2. Switching means 10 for selecting each circuit at the time of breaking and opening and switching the breaking current and the opening current flowing through the electromagnetic coil 6
0, a power supply capacitor 30 serving as a power supply for an open current, a current is supplied from a power supply 102, and the power supply capacitor 3
Power source booster 40 for charging current boosted to 0, valve body 5
When the valve opening detection signal is received from the valve opening detection means 70 for detecting the opening and closing of the valve and the valve opening detection signal is not opened,
A valve opening determination unit 50 that performs a reopening valve operation, the power supply boosting unit 4
The re-restoration voltage setting unit 60 and the like that determine the rising voltage value of 0 are configured.

Next, the operation of shutting off the gas passage A with the above configuration will be described. When the gas is abnormally used, the control means 10 determines a weighing signal sent from a gas meter weighing device (not shown), and when the signal is abnormal, the switching means 100 is supplied with current from the power source 102 and the electromagnetic coil 6 is supplied. Controls so that the closing current I ₁ flows. Therefore, as described above, this closing current I ₁ operates the gas shutoff valve G to shut off the gas passage A.

Next, in the operation of opening the cut off gas passage A, when a valve opening signal is input to the control means 10 from a remote operation unit (not shown), the control means 10 switches the switching means 100.
The switching operation is controlled to supply a current from the power supply 102 to the power supply booster 40 to charge the power supply capacitor 30 with the voltage boosted via the power supply booster 40, and then the charged current is applied to the electromagnetic coil 6 The discharge current I ₂ is controlled so as to be discharged as an open current I _{2 in a} direction opposite to the closing current I ₁ . Then, as described above, the opening current I ₂ operates the gas shutoff valve G to open and restore the shutoff gas passage A.

Here, the valve re-restoring operation of the control circuit portion C when the gas shut-off valve G cannot be opened and the gas passage A cannot be opened and restored because the valve body 5 is fixed to the valve seat 9 will be described. In a normal state in which the valve body 5 and the valve seat 9 are not fixed in a closed state, the electromagnetic coil 6 receives the open current I ₂ and excites a magnetic field in the same direction as the magnetic field of the permanent magnet 2 to excite the electromagnetic coil 6 and the permanent magnet 2. The two magnetic forces created by the above overcome the repulsive force of the spring 8, the plunger 4 moves downward and is attracted to the core piece 3, and the gas cutoff valve opens. However, in the abnormal state where the valve body 5 is adhered and fixed to the valve seat 9, the energy required for opening the valve becomes large. Specifically, the spring 8
In addition to the repulsive force, the releasing force necessary to detach the valve body 5 fixed to the valve seat 9 from the valve seat 9 is applied. Therefore, the opening current I ₂ excites the electromagnetic coil 6 to generate a magnetic force and a permanent magnet. Two
With the two magnetic forces created by, the repulsive force and the detaching force cannot be overcome, and the plunger 4 cannot be sucked and fixed to the core piece 3 by suction, and the gas cutoff valve G cannot be opened. Here, the valve opening detection unit 70 detects the valve opening / closing state of the valve body 5, and the valve opening determination unit 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 body 5 has not been opened, the valve opening determination unit 50 transmits the valve opening signal H to the control means 10 again, and the re-return voltage setting unit 60 sets the voltage higher than the boost voltage set at the time of the previous discharge. Send a signal to set. Valve open determination unit 5
Upon receiving the signal for increasing the set boost voltage from 0, the re-restoration voltage setting unit 60 sends a signal to the power supply boost unit 40 to boost the voltage by a predetermined voltage value as compared with 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 the above-mentioned procedure, and the power source 10
2 supplies current to the power supply booster 40,
After charging the power source capacitor 30 with a voltage boosted by a predetermined value higher than that at the time of the previous discharge via the above, the charged current is in the same direction as the previously discharged open current I _{2 in the} electromagnetic coil 6. In addition, it is controlled so as to be discharged as an open current I ₂ 'having a voltage higher than I ₂ by a predetermined value.

The electromagnetic coil 6 that has received the open current I ₂ ′ boosted higher than the previously released open current I ₂ has the same direction as the magnetic field created by the permanent magnet 2 and the previously received open current I 2.
_It creates a stronger magnetic field than the magnetic field created by ₂ and generates a stronger magnetic force than the previous discharge. Here, the electromagnetic coil 6 and the permanent magnet 2
If the magnetic force generated by the force exceeds the repulsive force of the spring 8 and the detaching force required to detach the valve body 5 fixed to the valve seat 9 from the valve seat 9, the plunger 4 is sucked to be attracted and fixed to the core piece 3, The shutoff valve G is opened and the shutoff passage A is opened and restored. When it is not exceeded, the open current boosted to a voltage higher than that at the time of the previous discharge is repeatedly applied to the electromagnetic coil 6 by the same procedure as described above, and finally the valve body 5 fixed to the valve seat 9 is released to release the gas cutoff valve G. Is operated to open and return the gas passage A that has been blocked.

[0020]

As is apparent from the above description, the gas shutoff valve device of the present invention detects a valve opening failure of the shutoff valve and opens the shutoff valve at the time of restart valve operation with a higher open current than that at the time of the previous discharge. Since the shutoff valve is repeatedly energized until it is opened,
It is possible to surely realize the opening return operation for releasing the interruption of the gas passage based on the valve opening signal which is operated for the opening return.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a gas cutoff valve device of the present invention.

FIG. 2 is a configuration diagram showing a conventional gas cutoff valve device.

[Explanation of symbols]

 10 Control Means 40 Power Supply Boosting Section 50 Valve Opening Determination Section 60 Re-Recovery Voltage Setting Section 70 Valve Opening Detection Section 100 Switching Section G Gas Cutoff Valve

Claims (1)

[Claims] 1. A gas cutoff valve for closing and opening a gas passage by an electromagnetic coil, a power supply capacitor for supplying a discharge current for opening the gas cutoff valve, a power supply for supplying power, and a power supply for this power supply. Receiving a metering signal of the gas flowing in the gas passage from the power source to the gas cutoff valve, and a power source boosting unit for charging the power source capacitor, a switching unit for switching charging / discharging of the power source capacitor Control means for energizing in a direction different from that of the energization of the capacitor and receiving a valve opening signal for opening and returning the gas shutoff valve to output a switching instruction signal to the switching means, and valve opening detection for detecting opening / closing of the shutoff valve Means for determining the valve open state from the valve open detection means, and when the shutoff valve is not released from the open state, the open valve signal is sent to the control means again and the voltage value previously set in the reset voltage setting section is changed. 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.