JPH08114471A - Cutoff valve built in fluidic gas meter - Google Patents

Abstract

PURPOSE: To prevent an erroneous measurement generated at a time when a pressure is changed by constituting a cutoff valve in such a way that it can be opened fully and closed fully and, in addition, that it can control a low flow rate. CONSTITUTION: A slave valve sheet 15 is formed at a main valve 11, and a pressure-regulating chamber A is formed inside the main valve 11. When the flow rate is high, the main valve 11 is opened. When the flow rate is low, only the main valve 11 is closed and only the slave valve 15 is opened. Thereby, a gas is passed inside the pressure-regulating chamber A, and a pressure change is eliminated here so that the pressure change is not propagated to the side of a nozzle.

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 fluidic gas meter.

[0002]

2. Description of the Related Art A conventional fluidic gas meter has a built-in shutoff valve for emergency shutoff. The structure of this shutoff valve is shown in FIG. In FIG. 12, 1 is a valve seat formed in the gas flow passage in the fluidic gas meter, 2 is a shutoff valve, 3 is a valve shaft, 4 is a solenoid, 5 is a core piece, and 7 is a spring. When the solenoid 4 is excited, the rear end 3a of the valve shaft 3 is attracted to the core piece 5 and the shutoff valve 2 is open. When a degaussing voltage as an emergency signal is applied to the solenoid 4, the core piece 5 is attracted. The shut-off valve 2 disappears and is brought into close contact with the valve seat 1 by the spring 7 to stop gas.

[0003]

As described above, the conventional shut-off valve has a structure which operates to be fully opened or fully closed, but has the following drawbacks. a. When the flow rate of gas is low, especially when measuring the flow rate with a flow sensor, if there is pressure fluctuation in the upstream, this pressure fluctuation will be transmitted to the fluidic element and the flow sensor side as it is and erroneously measured. It may end up.

[0004]

In order to solve the above-mentioned problems, the present invention is provided with a function of preventing the pressure fluctuation generated on the upstream side of the shutoff valve from propagating to the fluidic element and the flow sensor side. The structure is as follows.

1. A pressure regulating chamber is formed inside, a low flow rate outlet is formed in the front plate of this pressure regulating chamber, and a sub-valve seat is formed in the center of the rear plate. And a main valve core piece that holds or releases a main valve shaft that extends rearward from the main valve, and a child valve core piece that holds or releases a child valve shaft that extends rearward from the child valve. A main valve solenoid for exciting or demagnetizing the main valve core piece to hold or release the main valve shaft; and a child valve solenoid for exciting or demagnetizing the child valve core piece to hold or release the child valve shaft. , A main valve spring for urging the main valve toward the main valve seat, and a slave valve spring for urging the slave valve toward the slave valve seat side, which is incorporated in a fluidic gas meter. Shut-off valve.

2. A pressure regulating chamber is formed inside, a low flow rate outlet is formed in the front plate of this pressure regulating chamber, and a sub-valve seat is formed in the center of the rear plate. A sub-valve, a main valve core piece for holding or releasing a hollow main valve shaft extended rearward from the main valve, and a main valve core piece for holding or releasing a sub-valve shaft extended rearward from the sub-valve, A core piece for the child valve built into the main valve shaft,
A main valve solenoid for exciting or demagnetizing the main valve core piece to hold or release the main valve shaft, and a main valve solenoid for exciting or demagnetizing the child valve core piece to hold or release the child valve shaft. A solenoid for a child valve built in the shaft,
A shutoff incorporated in a fluidic gas meter, which comprises a main valve spring for urging the main valve toward the main valve seat, and a slave valve spring for urging the slave valve toward the slave valve seat. valve.

3. A pressure regulating chamber is formed inside, a low flow rate outlet is formed in the front plate of this pressure regulating chamber, and a sub-valve seat is formed in the center of the rear plate. And a main valve core piece that holds or releases the main valve shaft that extends rearward from the main valve, and a child valve shaft that extends rearward from the main valve shaft through the main valve shaft. Or, in order to release, a valve core piece integrally formed on the front surface of the main valve core piece, a solenoid for switching the applied voltage to excite or demagnetize the main valve core piece or the child valve core piece, A main valve spring for urging the main valve toward the main valve seat, and a slave valve spring for urging the slave valve toward the slave valve seat side. .

4. A sub-valve seat is formed in the center, a pressure regulating chamber is formed so as to surround the rear of the sub-valve sheet, and a gas inlet is formed on the outer periphery of the pressure regulating chamber. A sub-valve that is intimately attached to the sub-valve seat in the pressure regulating chamber, a main valve shaft that extends rearward from the main valve, and a sub-valve shaft that extends rearward from the sub-valve through the main valve shaft. A main valve core piece for holding or releasing the main valve shaft, a child valve core piece integrally formed on the front surface of the main valve core piece for holding or releasing the child valve shaft, and the main valve by switching the voltage Solenoid for energizing or demagnetizing a core piece for a valve or a child valve, a main valve spring for urging the main valve toward the main valve seat, and a child for activating the child valve toward the child valve seat. Built into a fluidic gas meter consisting of a valve spring and Shut-off valve.

[0009]

In normal operation, the main valve and the slave valve (or only the main valve) are open, and the gas flows to the nozzle side of the fluidic element via the main valve seat. When the fluidic element (or flow sensor) side detects a flow rate (low flow rate) that is less than the set flow rate, the control circuit on the meter side sends a signal (demagnetization voltage) to the main valve solenoid to demagnetize the main valve solenoid. To do. As a result, the main valve shaft is released from the main valve core piece, and the force of the main valve spring causes the main valve to come into close contact with the main valve seat. However, at this time, since the child valve remains open, the gas once enters the pressure regulation chamber from the child valve seat and flows from the low flow rate outlet to the nozzle side of the fluidic element via the main valve seat. In this situation, if there is pressure fluctuation upstream of the shut-off valve, this pressure fluctuation is once throttled when flowing in from the child valve seat, then released in the pressure regulating chamber with the next largest volume, and then again at the low flow rate outlet. After being squeezed by, it flows to the nozzle side of the fluidic element via the main valve seat, so that the pressure fluctuation is absorbed during this passage process. As a result, the pressure fluctuation generated on the upstream side does not propagate to the fluidic element and the flow sensor side.

Next, when the emergency cutoff signal is input to the child valve solenoid, the exciting action of the child valve solenoid disappears and the child valve closes. On the other hand, if the amount of gas passing through increases,
The solenoid for the main valve works again to open the main valve.

[0011]

【Example】

Embodiment 1 FIG. 1 is an embodiment of the invention described in claim 1. Reference numeral 10 is a main valve seat, and this main valve seat 10 is formed in the gas flow path from the gas inlet of the fluidic gas meter to the nozzle. Reference numeral 11 denotes a main valve, which is composed of a cylindrical body, which forms a pressure regulating chamber A inside by a front plate 12 and a rear plate 14 and forms a low flow rate outlet 13 in a part of the front plate 12. Then, in the center of the rear plate 14, the child valve seat 1
5 is a structure in which 5 is formed. Reference numeral 16 is a gas inlet formed on the outer periphery of the front end of a cylindrical main valve shaft 17 formed by extending rearward from the main valve 11. Reference numeral 18 is a child valve, and this child valve 18 can be brought into close contact with the child valve seat 15 of the main valve 11 from the upstream side. 19 is a child valve shaft extending rearward from the center of the child valve 18, 20 is a main valve spring for pushing the main valve 11 to the main valve seat 10 side, 21 is a child valve 18 pushing the child valve 18 to the child valve seat 15 side It is a spring for a child valve. Reference numeral 22 denotes a main valve control device, and this main valve control device 2
2 includes a solenoid 23 for the main valve and a core piece 24 for the main valve. When a voltage is applied to the solenoid 23 for the main valve, the core piece 24 for the main valve is excited and the rear end of the main valve shaft 17 is magnetized. Hold 11 open. Reference numeral 25 denotes a child valve control device, which includes a child valve solenoid 26 and a child valve core piece 27. When a voltage is applied to the child valve solenoid 26, the child valve core piece 27 is excited and the rear end of the child valve shaft 19 is excited. To hold the valve 18 open. FIG. 2 is a sectional view taken along the line AA ′, in which the child valve shaft 19 is located at the center of the main valve shaft 17. FIG. 3 is a sectional view taken along the line BB ′, in which the inflow ports 16 are provided at four locations on the circumference of the main valve shaft 17.

In the above embodiment, the main valve shaft 17 is normally operated.
Is held at its rear end by the main valve core piece 24, the child valve shaft 19 is held by the child valve core piece 27, and both valves are open (FIG. 4). In this state, when the flow rate of the gas becomes equal to or lower than the set value, the demagnetizing voltage is applied to the solenoid 23 for the main valve, the core piece 24 for the main valve releases the main valve shaft 17, the main valve 11 is closed, and only the child valve 18 is released. It is controlled to the open state (Fig. 5). As a result, the gas flows from the gas inlet 16 to the child valve seat 15 to the low flow outlet 1 as shown by the arrow in FIG.
3 → Flows from the main valve seat 10, and even if there is pressure fluctuation on the upstream side during this, this pressure fluctuation is absorbed while passing through the pressure regulation chamber A and propagates to the fluidic element and flow sensor side. Be blocked. Next, when an emergency signal is input to the shutoff valve, a degaussing voltage is applied to the child valve solenoid 26, the child valve core piece 27 releases the child valve shaft 19, and the spring 21 acts to cause the child valve 18 to move. The gas is stopped in close contact with the valve seat 15 (Fig. 6). Next, when the flow rate of the gas increases above the set value, the main valve solenoid 23 and the child valve solenoid 26 are driven to open the main valve 11 and the child valve 18.

Table 1 shows the above valve operation.

[Table 1]

Embodiment 2 FIG. 7 shows an embodiment of the invention described in claim 2. In FIG. 7, 30 is a main valve seat, and this main valve seat 3
0 is formed in the gas flow path from the gas inlet of the fluidic gas meter to the nozzle. 31 is a main valve, and this main valve 31 is made of a cylindrical body, and has a front plate 32 and a rear plate 3.
3, the pressure regulating chamber A is formed inside, the low flow rate outlet 34 is formed in a part of the front plate 32, and the child valve seat 35 is formed in the center of the rear plate 33. Reference numeral 36 denotes a cylindrical main valve shaft extending rearward from the main valve 31, and a gas inlet 37 is formed on the outer circumference of the front end portion. Reference numeral 38 is a sub-valve that can be brought into close contact with the sub-valve seat 35 from outside, and 39 is a sub-valve shaft. A fixing plate 40 is provided inside the rear of the main valve shaft 36.
1 is a magnetic absorption part formed rearward through 1, 42 is a main valve core piece fixed to the main body 43 facing the magnetic absorption part 40, and 44 is a main valve solenoid fixed to the main body 43. is there. Reference numeral 45 denotes a child valve core piece fixed in the main valve shaft 36, and 46 denotes a child valve solenoid similarly fixed in the main valve shaft 36. The child valve 38, the child valve shaft 39, and the child valve core piece 45. In the main valve shaft 36, the child valve solenoid 46 moves together with the main valve 31. Reference numeral 47 is a main valve spring, and 48 is a child valve spring.

In the case of the above embodiment, as in the case of the first embodiment, both the main valve 31 and the sub valve 38 are controlled to be fully opened at the time of a large flow rate, the main valve 30 is closed at the time of a low flow rate, and only the sub valve 38 is opened. Both sides are closed in an emergency. Further, the influence of the pressure fluctuation at a low flow rate is eliminated in the pressure regulation chamber A. A control example of the main valve 31 and the sub valve 38 is the same as that in Table 1 described in the first embodiment.

Embodiment 3 FIGS. 8 and 9 show an embodiment of the invention described in claim 3. In FIGS. 8 and 9, 50 is a main valve seat, and this main valve seat 50 is formed in the gas flow path from the gas inlet of the fluidic gas meter to the nozzle. 5
Reference numeral 1 is a main valve, and this main valve 51 is composed of a cylindrical body. A pressure regulating chamber A is formed inside by a front plate 52 and a rear plate 53, and a low flow rate outlet 54 is formed in a part of the front plate 52. Back plate 3
This is a structure in which a child valve seat 55 is formed at the center of 3. 56
Is a cylindrical main valve shaft extending rearward from the main valve 51, and a gas inlet 57 is formed on the outer circumference of the front end portion. Reference numeral 58 is a sub-valve that can be brought into close contact with the sub-valve seat 55 from the outside, and 59 is a sub-valve shaft. Reference numeral 60 is a main valve core piece fixed to the main body 63, 61 is a child valve core piece formed on the front surface of the main valve core piece 60, 62 is a solenoid, 64 is a main valve spring, and 65 is a front portion from the child valve 58. Further, reference numeral 66 denotes a spring receiving shaft extendedly provided in the pressure regulating chamber A, 66 denotes a spring receiver, and 67 denotes a child valve spring.

In the case of the above embodiment, when the flow rate is large, both the main valve 51 and the sub valve 58 are opened by the action of the solenoid 62, and when the flow rate is low, only the main valve 51 is closed by the voltage applied to the solenoid 62 and the sub valve 58. Is kept open, and the child valve 58 is closed in an emergency. Similarly, when the main valve 51 and the slave valve 58 are restored, the voltage applied to the solenoid 62 is switched to control the main valve 51 and / or the slave valve 58. The disappearance of the influence of the pressure fluctuation and the control example of the main valve 51 and the main valve 58 are the same as those in Table 1 described in the first embodiment.

Embodiment 4 FIGS. 10 and 11 show an embodiment of the invention described in claim 4. In FIGS. 10 and 11, 70 is a main valve seat, and this main valve seat 70 is formed in the gas flow path from the gas inlet of the fluidic gas meter to the nozzle. Reference numeral 71 denotes a main valve. The main valve 71 is formed in a disc shape, forms a child valve seat 72 in the center, and forms a pressure regulating chamber A so as to surround the child valve seat 72. A
This is a structure in which a gas inlet 74 is formed on the outer periphery of the. A main valve shaft 73 extends rearward from the pressure regulating chamber A. 75 is a sub-valve that can be attached to the sub-valve seat 72 from the outside,
Reference numeral 76 is a child valve shaft. Reference numeral 77 denotes a main valve core piece fixed to the main body 79 behind the main valve shaft 76, and 78.
Is a child valve core piece that is integrally formed on the front surface of the main valve core piece 77, and 80 is a solenoid, and switches the main valve core piece 77 or the child valve core piece 78 to excite by switching the applied voltage. By
The opening / closing of the main valve 71 and the child valve 75 is controlled. Reference numeral 81 is a main valve spring, 82 is a spring receiving shaft that extends forward from the child valve 75, 83 is a spring receiver, and 84 is a child valve spring.

In the case of the above-described embodiment, as in the case of the first embodiment, the solenoid 80 controls the main valve 71 and the child valve 75 to be fully opened at a large flow rate, and the main valve 71 is closed at a low flow rate.
By controlling the child valve 75 to open, the pressure regulation chamber A eliminates the influence of the pressure fluctuation when the flow rate is low. A control example of the main valve 71 and the slave valve 75 is the same as that in Table 1 described in the first embodiment.

[0020]

The effects of the present invention are as follows. a. The shut-off valve has the function of closing the main valve and opening only the slave valve when the flow rate is low, and allowing gas to flow through the pressure regulation chamber, so when pressure fluctuations occur on the upstream side, this pressure fluctuation Disappears in the pressure regulation chamber and does not propagate to the nozzle side. As a result, erroneous measurement does not occur even if there is pressure fluctuation. b. When the main valve and the slave valve are controlled by switching the voltage applied to one solenoid, the shutoff valve can be downsized, simplified, and reduced in cost.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an embodiment corresponding to claim 1.

FIG. 2 is a sectional view taken along the 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 the main valve and the slave valve.

FIG. 5 is an explanatory diagram of a state where the main valve is closed and the child valve is opened.

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

FIG. 7 is an embodiment diagram of the invention according to claim 2;

FIG. 8 is an embodiment diagram of the invention according to claim 3;

FIG. 9 is an embodiment diagram of the invention according to claim 3;

FIG. 10 is an embodiment diagram of the invention according to claim 4;

FIG. 11 is an embodiment diagram of the invention according to claim 4;

FIG. 12 is an explanatory view of a conventional shutoff valve.

[Explanation of symbols]

 10 main valve seat 11 main valve 12 front plate 13 small flow hole 14 rear wall 15 sub valve seat 16 gas inlet 17 main valve shaft 18 sub valve 19 sub valve shaft 20 main valve spring 21 sub valve spring 22 valve body 23 Main valve core piece 24 Main valve solenoid 25 Sub valve core piece 26 Sub valve solenoid 30, 50, 70 Main valve seat 31, 51, 71 Main valve 35, 55, 72 Sub valve seat 38, 58, 75 Sub valve 44 Main valve solenoid 61 ・ 80 Solenoid A Pressure regulation chamber

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[Procedure amendment]

[Submission date] February 3, 1995

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 7

[Correction method] Change

[Correction content]

[Figure 7]

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hideo Kato 3-28-70-108 Minamisenju, Arakawa-ku, Tokyo (72) Inventor Norio Niimura 800 Tsutsui-cho, Yamatokoriyama City, Nara Prefecture (72) Masaki Yamaguchi Nara Nara 800 Tsutsui-cho, Yamatokoriyama-shi, prefecture (72) Inventor Rikio Kato 23 Minamikashima, Futamata-cho, Tenryu-shi, Shizuoka Inside Yazaki Keiki Co., Ltd.

Claims (4)

[Claims] 1. A main valve having a pressure regulating chamber formed therein, a low flow rate outlet being formed in a front plate of the pressure regulating chamber, and a child valve seat formed in the center of the rear plate, and the child valve seat. A child valve that can be intimately contacted from the outside, a main valve core piece that holds or releases a main valve shaft that extends rearward from the main valve, and a child valve shaft that extends rearward from the child valve. A child valve core piece, a main valve solenoid that excites or demagnetizes the main valve core to hold or releases the main valve shaft, and an exciter or demagnetize the child valve core piece to hold or release the child valve shaft A fluidic solenoid comprising a child valve solenoid, a main valve spring that urges the main valve toward the main valve seat, and a child valve spring that urges the child valve toward the child valve seat. A shutoff valve built into the gas meter. 2. A main valve having a pressure regulating chamber formed therein, a low flow rate outlet being formed in a front plate of the pressure regulating chamber, and a child valve seat formed in the center of the rear plate, and the child valve seat. A child valve that can be intimately contacted from the outside, a main valve core piece that holds or releases a hollow main valve shaft that extends rearward from the main valve, and a child valve shaft that extends rearward from the child valve. In order to do so, a child valve core piece incorporated in the main valve shaft, a main valve solenoid for holding or releasing the main valve shaft by exciting or demagnetizing the main valve core piece, and the child valve core piece. In order to hold or release the slave valve shaft by exciting or demagnetizing, a slave valve solenoid incorporated in the main valve shaft, and a main valve spring that biases the main valve toward the main valve seat side. From the child valve spring for urging the child valve toward the child valve seat side, Shut-off valve incorporated in a fluidic gas in meter that. 3. A main valve having a pressure regulating chamber formed therein, a low flow rate outlet being formed in a front plate of the pressure regulating chamber, and a child valve seat formed in the center of the rear plate, and the child valve seat. A child valve that can be intimately contacted from the outside, a main valve core piece that holds or releases a main valve shaft that extends rearward from the main valve, and a rear valve that extends rearward from the child valve through the inside of the main valve shaft. In order to hold or release the slave valve shaft, the slave valve core piece integrally formed on the front surface of the main valve core piece and the applied voltage are switched to excite or demagnetize the main valve core piece or the slave valve core piece. Inside the fluidic gas meter, including a solenoid, a main valve spring for urging the main valve toward the main valve seat, and a slave valve spring for urging the slave valve toward the slave valve seat. Shut-off valve built into the. 4. A main valve having a structure in which a child valve seat is formed in the center, a pressure regulating chamber is formed so as to surround the rear of the child valve seat, and a gas inlet is formed on the outer periphery of the pressure regulating chamber. A sub-valve that is freely attached to the sub-valve seat of the main valve in the pressure regulating chamber; a main valve shaft that extends rearward from the main valve; and a rear valve that extends rearward from the sub-valve through the main valve shaft. A child valve shaft, a main valve core piece for holding or releasing the main valve shaft, a child valve core piece integrally formed on the front surface of the main valve core piece for holding or releasing the child valve shaft, and A solenoid that excites or demagnetizes the main valve core piece or the child valve core piece by switching, a main valve spring that urges the main valve to the main valve seat side, and the child valve to the child valve seat side. A fluidic valve spring consisting of Shut-off valve built into the controller.