JP3295233B2 - Shut-off valve built into fluidic gas meter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shutoff valve incorporated in a fluid gas meter.

[0002]

2. Description of the Related Art FIG. 7 shows the structure of a shut-off valve incorporated in a conventional fluidic gas meter. In FIG. 7, reference numeral 1 denotes a valve seat formed in a gas flow path, 2 denotes a valve, 3 denotes a valve shaft, 4 denotes a solenoid, 5 denotes a core piece, and 7 denotes a spring. 3a is the core piece 5
When the demagnetizing voltage is applied to the solenoid 4 as an emergency signal, the magnetism of the core piece 5 disappears, and the valve 2 comes into close contact with the valve seat 1 by the spring 7. It is a configuration to stop gas.

[0003]

The above conventional shut-off valve is
It is a structure that operates fully open or fully closed. If a large amount of gas passes through the meter, it does not affect the fluid vibration (flow signal) generated by the fluidic element, but the gas consumption is When the amount of gas passing through the meter decreases and the valve 2 is fully opened, the pressure fluctuation generated on the upstream side propagates as it is to the fluidic element side, and This causes an error in the generated fluid vibration and the flow rate measurement performed based on the vibration.

[0004] The present invention is proposed in view of the above-mentioned point, and is intended to prevent the pressure fluctuation generated on the upstream side from being propagated to the fluidic element side particularly when the amount of gas passing through the gas meter is small. The purpose is to propose a devised shut-off valve.

[0005]

The structure of the shut-off valve incorporated in the fluidic gas meter according to the present invention is as follows.

[0006] 1. A small valve seat for small flow control is formed at the center of the flat main valve body, and a fluid inlet is provided in the main valve body outside the child valve sheet, and a main valve shaft is formed further rearward. A main valve for large flow rate control, a child valve for small flow rate control, which can be closely attached to a child valve seat of the main valve, and is provided with a child valve shaft extended rearward, and the main valve. A main valve spring biasing the main valve seat side, a main valve core piece that holds or releases the main valve shaft, and a main valve shaft that is magnetized and held by the main valve core piece to hold the main valve. A main valve control device comprising a main valve solenoid that is open, releases the holding of the main valve shaft in an emergency and at the time of small flow control, and controls the main valve seat to be closed by the force of the main valve spring; A child valve spring that biases the child valve toward the child valve seat, and a child valve core that holds or releases the child valve. A child valve control device comprising a piece and a child valve solenoid which controls the child valve to be opened or closed at the time of large flow control, is controlled to be open at the time of small flow control, and is closed by the force of the child valve spring at the time of emergency. And a shut-off valve built into the fluidic gas meter.

[0007] 2. 2. The shut-off valve incorporated in the fluidic gas meter according to the above item 1, which controls opening and closing of the main valve and the child valve by controlling a voltage applied to the solenoid for the main valve and the solenoid for the child valve.

[0008]

When the gas having a certain flow rate or more passes through the fluid gas meter, the main valve or both the main valve and the slave valve are fully opened. When the flow rate falls below a certain flow rate, the main valve is controlled to be fully closed and the child valve is controlled to be fully open, so that a low flow rate flows toward the fluidic element (nozzle). The control of the main valve and the child valve is performed by controlling the voltage applied to the main valve control device and the voltage applied to the child valve control device. When the emergency cutoff signal is input, both the main valve and the child valve are controlled to be fully closed. The control of the main valve and the child valve detects the flow rate based on a signal generated by the fluidic element, and is automatically controlled by a control circuit.

[0009]

【Example】

Embodiment 1 An embodiment of the present invention will be described in detail with reference to FIGS. Reference numeral 10 denotes a main valve seat provided in a gas flow path in the fluidic gas meter, and 11 denotes a main valve.
Has a disk shape, and a small flow control child valve seat 1 is provided at the center thereof.
5, and a gas inlet 16 is provided in a main valve shaft 17 extending outward from the main valve 11 in a direction outside the child valve seat 15.

Reference numeral 18 denotes a child valve which can be in close contact with the child valve seat 15, and a child valve shaft 19 is attached to the rear of the child valve 18 so as to extend therefrom.

Reference numeral 20 denotes a main valve spring that urges the main valve 11 toward the main valve seat 10, and reference numeral 21 denotes a child valve spring that urges the child valve 18 toward the child valve seat 15.

Reference numeral 22 denotes a main valve control device. The main valve control device 22 includes a main valve solenoid 23, a main valve core piece 24, and the main valve spring 20.

Reference numeral 25 denotes a slave valve control device. The slave valve control device 25 includes a slave valve solenoid 26, a slave valve core piece 27, and the slave valve spring 21.

FIG. 2 is a cross-sectional view taken along the line AA '. In the case of the embodiment, the main valve shaft 17 is hollow, and the slave valve shaft 19 is slidably inserted into the main valve shaft 17. I have.

FIG. 3 is a cross-sectional view taken along the line BB '. In the embodiment, the main valve shaft 17 is provided with four fluid inlets 16 at four locations.

In the case of the above embodiment, the main valve shaft 17
Is magnetized at the rear end of the main valve core piece 24,
Numeral 9 is magnetized by the child valve core piece 27, and both valves are in a fully open state (FIG. 4). When an emergency signal is input to the shut-off valve in this state, a demagnetizing voltage is applied to both the main valve solenoid 23 and the slave valve solenoid 26, and both the main valve core piece 24 and the slave valve core piece 27 are magnetized. The operation is lost, the main valve shaft 17 and the child valve shaft 19 are released, and the main valve 11 and the child valve 18 come into close contact with the respective valve seats 10 and 15 to stop the fluid (FIG. 5).

Next, when performing small flow control, the main valve 11 is closed and only the child valve 18 is open. As a result, the fluid passes through the child valve seat 15 from the fluid inlet 16 and passes through the main valve seat 1.
0 (FIG. 6). When an emergency cutoff signal is input in this state, the child valve 18 closes.

Table 1 shows the basic operation of the above valve action.

[Table 1]

[0019]

The effects of the present invention are as follows.

A. The shutoff valve can perform low flow rate control by opening only the small valve in addition to fully opening and closing the large valve. As a result, in a fluidic flow meter that measures fluid flow by detecting fluid vibration with a fluidic element, when the consumption is small, the flow rate passing through the shut-off valve is controlled to a low flow rate so that the shut-off valve is controlled. During the passage, the pressure fluctuation is absorbed and does not propagate to the fluidic element side. Therefore, it is possible to perform accurate measurement without being affected by the pressure fluctuation, particularly at the time of low consumption measurement.

B. By controlling the switching between the solenoid for the large valve and the solenoid for the small valve by the applied voltage, the control of the large valve and the small valve can be performed simply and reliably.

[Brief description of the drawings]

FIG. 1 is an explanatory view of an embodiment corresponding to claim 1;

FIG. 2 is a sectional view taken along line AA ′.

FIG. 3 is a sectional view taken along line BB ′.

FIG. 4 is an explanatory view of a fully opened state of both a main valve and a child valve.

FIG. 5 is an explanatory diagram of a state where both a main valve and a child valve are fully closed.

FIG. 6 is an explanatory diagram of a main valve closed state and a child valve open state.

FIG. 7 is an explanatory view of a conventional shut-off valve.

[Explanation of symbols]

 Reference Signs List 10 Main valve seat 11 Main valve 12 Closure plate 13 Small flow hole 14 Partition wall 15 Child valve seat 17 Main valve shaft 18 Child valve 19 Child valve shaft 20 Spring for main valve 21 Child valve shaft 22 Main valve control device 23 Solenoid for main valve 24 Core Piece for Main Valve 25 Child Valve Control Device 26 Solenoid for Child Valve 27 Core Piece for Child Valve

Claims (2)

(57) [Claims] 1. A small valve seat for controlling a small flow rate is formed at the center of a flat main valve body, and a fluid inlet is provided in the main valve body outside the child valve seat and further toward the rear. A main valve for large flow control formed by forming a main valve shaft; and a small valve for small flow control provided so as to be in close contact with the child valve seat of the main valve and extending the child valve shaft rearward. A main valve spring that biases the main valve toward the main valve seat, and a main valve core piece that holds or releases the main valve shaft;
The main valve core piece is magnetized to hold and hold the main valve shaft to open the main valve.In emergency and small flow rate control, the main valve shaft is released and the main valve spring releases the main valve shaft. A main valve control device comprising a main valve solenoid for controlling the valve seat to be closed; a child valve spring for urging the child valve toward the child valve seat; and a child valve core piece for holding or releasing the child valve A child valve control device comprising a child valve solenoid which controls the child valve to be opened or closed at the time of large flow control, is controlled to be open at the time of small flow control, and is controlled to be closed by the force of the child valve spring in an emergency. A shut-off valve built into a fluidic gas meter, which comprises 2. The shut-off valve incorporated in a fluidic gas meter according to claim 1, wherein a voltage applied to the solenoid for the main valve and the solenoid for the slave valve is controlled to control the opening and closing of the master valve and the slave valve.