JPH0645141Y2 - Gas emergency shutoff device with return safety confirmation mechanism - Google Patents

Description

[Detailed Description of the Invention] (Industrial application field) The present invention is an emergency gas equipped with a return safety confirmation mechanism for restarting the gas supply after shutting off the gas in an emergency such as an earthquake, gas leak, or fire. The present invention relates to a circuit breaker.

(Prior Art) In the conventional emergency gas cutoff device with a return safety confirmation mechanism disclosed in Japanese Patent Publication No. 51-42781, a detector sends a signal of occurrence of an emergency such as an earthquake to a control panel, Closes the solenoid valve-type emergency shutoff valve attached to the gas pipe and immediately stops the gas supply.

When the abnormal situation has subsided, the return button on the control panel is pressed to open the solenoid valve inserted in the pipeline connecting the balance tank and the gas pipe and the emergency shutoff valve for a short period of 1 to 2 minutes. Gas flows into the tank, and then the electromagnetic valve and the emergency shutoff valve are closed again, so that the gas pressure in the gas pipe is stored in the balance tank. Here, the gas pressure in the gas pipe on the downstream side of the solenoid valve and the gas pressure in the balance tank are compared by the differential pressure transmitter, and when the gas pressure on the downstream side is low, the differential pressure transmitter transfers to the control panel. An abnormal signal is sent to notify that the gas pipe is damaged by a buzzer or the gas appliance plug that was in use is not closed. After confirming the safety by closing the gas appliance plug or repairing the damaged part, the return button is pressed to open the electromagnetic valve and the emergency shutoff valve gas, and the gas supply is restarted.

(Problems to be solved by the invention) However, such an operation method requires a solenoid valve between the balance tank and the gas pipe in addition to the emergency shutoff valve, so that the configuration of the entire device is complicated and The cost cannot be reduced, and an extra installation space is required for the solenoid valve.

Therefore, the purpose of the present invention is to eliminate the need for a solenoid valve for opening and closing the balance tank, which simplifies the overall configuration of the device, which reduces the manufacturing cost and installation space. It is to provide a gas emergency shutoff device.

(Means for Solving Problems) The gas emergency shutoff device with a return safety confirmation mechanism according to the present invention will be described below with reference to the reference numerals in the accompanying drawings. The gist of the present invention is the outer peripheral surface 1a of the spherical valve body 1 and the valve casing. A gas passage A is formed between inner peripheral surfaces 12a of the gas passages 12, and the emergency shutoff valve 2 is constituted by a spherical valve that seals the gas passage A with an annular upstream packing 3a and a downstream packing 3b. The first pressure detection hole 4 is provided in the valve casing 12 between the 3a and the downstream packing 3b, the second pressure detection hole 5 is provided downstream of the downstream packing 3b, and the first pressure detection hole 4 is provided in the balance tank 7 The balance tank 7 and the second pressure detection hole 5 are connected to the differential pressure sensor 6, and the emergency shutoff valve 2 is opened / closed by a detection signal of the differential pressure sensor 6.

(Operation) When a detection signal is sent from the detector 11 such as a seismoscope, a gas leak alarm, a fire alarm, etc. to the controller 9, the controller 9 drives the electric motor 8 to rotate. The output shaft 14 of the electric motor 8 is fitted in the receiving hole 16 of the spherical valve body 1, and the spherical valve body 1 is
As shown in the figure, the central valve hole 2a rotates to a fully closed position between the upstream packing 3a and the downstream packing 3b. As a result, the emergency shutoff valve 2 is closed and the gas supply is shut off.

When the earthquake or the like ends, the electric motor 8 is activated by a signal from the controller 9 to rotate the spherical valve element 1 to the fully open position shown in FIG. The emergency shutoff valve 2 is opened for a very short time, and the emergency shutoff valve 2 is then closed again.

When the spherical valve element 1 moves between the fully closed position and the fully open position in this manner, the central valve hole 2a obliquely intersects the annular upstream packing 3a and the downstream packing 3b as shown in FIG. In this state, the gas can flow into the gas passage A, and the gas flows into the first pressure detection hole 4
And flows into the balance tank 7.

The gas flowing into the balance tank 7 is contained in the balance tank 7 by rotating the spherical valve body 1 again to the fully closed position as described above, and the gas pressure of the gas pipe 13 is stored in the balance tank. Here, the pressure difference between the gas pressure in the gas pipe downstream of the emergency shutoff valve 2 obtained from the second pressure detection hole 5 and the gas pressure in the balance tank is 6
Contrasted with.

When the gas pressure on the downstream side is low, an abnormal signal is sent from the differential pressure sensor 6 to the controller 9, and the gas pipe on the downstream side is damaged by the buzzer of the monitoring panel 10 or is in use. Informs that the stopper is not closed. After checking the safety by closing the gas appliance plug or repairing the damaged part,
The controller 9 sends a drive signal to the electric motor 8 to rotate the spherical valve element 1 to the fully open position shown in FIG. This restarts the gas supply.

(Embodiment) Although the pressure switch is used as the differential pressure sensor 6 in the embodiment shown in FIGS. 1 to 4, the type of the differential pressure sensor,
The structure is not particularly limited to this, and a known structure can be appropriately selected and used.

In the embodiment shown in FIG. 5, the spherical valve body 1 is provided with a through hole 15 for communicating the central valve hole 2a with the gas passage A. Since the balance tank 7 is always connected to the gas pipe through the through hole 15 and the first pressure detection hole 4, when the emergency shutoff valve 2 is closed due to an abnormal situation, the gas pressure in the balance tank 7 has already been exceeded. Is the same as the pressure in the gas pipe. Therefore, even if the opening / closing operation time of the spherical valve body 1 is short, differential pressure detection can be performed without any trouble.

(Effect of the Invention) As described above, in the gas emergency shutoff device with the return safety confirmation mechanism of the present invention, the gas passage A formed between the outer peripheral surface 1a of the spherical valve body 1 and the inner peripheral surface 12a of the valve casing 12 is formed into an annular shape. The emergency shutoff valve 2 is constituted by a spherical valve sealed by the upstream side packing 3a and the downstream side packing 3b, and the first pressure detection hole 4 is provided in the valve casing 12 between the upstream side packing 3a and the downstream side packing 3b. The balance tank 7 is connected and the downstream packing
The second pressure detection hole 5 provided on the downstream side of 3b and the balance tank 7 are connected to the differential pressure sensor 6, and since the emergency shutoff valve 2 also serves as the opening / closing operation valve of the balance tank 7, It is not necessary to attach a solenoid valve exclusively for opening and closing the balance tank as in the device.

Therefore, the entire structure of the gas emergency shutoff device with the return safety confirmation mechanism can be simplified, and the manufacturing cost and the installation space can be reduced.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a main part of a gas emergency shutoff device with a return safety confirmation mechanism according to an embodiment of the present invention, in which the emergency shutoff valve is fully open. Fig. 2 shows A of Fig. 1 of the emergency shutoff valve.
FIG. FIG. 3 is a sectional view corresponding to FIG. 2 when the emergency shutoff valve is in a half-open state, and FIG. 4 is a sectional view corresponding to FIG. 2 when the emergency shutoff valve is in a fully closed state. FIG. 5 is a vertical cross-sectional view of a main part of a gas emergency shutoff device with a return safety confirmation mechanism according to another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1 ... Spherical valve body, 2 ... Emergency shutoff valve, 2a ... Central valve hole, 3a ... Upstream packing, 3b ... Downstream packing, 4 ... 1st pressure detection hole, 5 ... 2nd pressure detection hole, 6 ... Differential pressure Sensor, 7 ... Balance tank, 8 ... Electric motor, 9 ... Controller, 10 ... Monitoring panel, 11
… Alarm, 12… Valve casing, 13… Gas pipe, 14… Output shaft

Claims (1)

[Scope of utility model registration request] 1. A gas passage A is formed between an outer peripheral surface 1a of a spherical valve body 1 and an inner peripheral surface 12a of a valve casing 12, and the gas passage A is sealed by an annular upstream packing 3a and a downstream packing 3b. The emergency shutoff valve 2 is constituted by the spherical valve described above, and the valve casing between the upstream packing 3a and the downstream packing 3b.
12 is provided with a first pressure detection hole 4, a second pressure detection hole 5 is provided on the downstream side of the downstream side packing 3b, the first pressure detection hole 4 is connected to a balance tank 7, and the balance tank 7 and the 2. A gas emergency shutoff device with a return safety confirmation mechanism that connects the pressure detection hole 5 to a differential pressure sensor 6 and opens and closes the emergency shutoff valve 2 according to a detection signal of the differential pressure sensor 6.