JP3408344B2 - Shut-off valve for 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 gas meter cutoff valve capable of reducing the influence of gas pressure fluctuations on a gas meter.

[0002]

2. Description of the Related Art A gas meter is provided with a shutoff valve that shuts off the supply of gas when an abnormality such as a gas leak occurs.

By the way, in a gas meter, a gas pressure fluctuation occurs on the upstream side of the gas meter depending on the condition of the nearby gas meter, the usage status of the nearby gas, and the like. for that reason,
When a fluidic gas meter is used as the gas meter, pressure fluctuations on the upstream side have caused problems as described below. Incidentally, the fluidic gas meter, on the downstream side of the nozzle that generates the jet flow, forms a flow path expansion portion by a pair of side walls, and a return guide provided on the outside of the side wall allows the gas that has passed through the nozzle to flow through each side wall. By utilizing a phenomenon in which a pair of feedback flow paths that lead to the ejection port side of the nozzle are formed along the outside and gas that has passed through the nozzle alternately flows through the pair of feedback flow paths (referred to as fluidic oscillation in this application). The flow rate of the gas is measured based on the frequency (in the present application, the oscillation frequency) and the cycle of switching of the flow direction of the gas that has passed through the nozzle.

When this fluidic gas meter is used, there is a problem in that the oscillation frequency of the fluidic gas meter is disturbed by pressure fluctuations on the upstream side, the error of the measured flow rate becomes large, or the flow rate cannot be measured.

Therefore, a shutoff valve capable of reducing the gas pressure fluctuation has been proposed. FIG. 12: is sectional drawing which shows an example of a structure of the fluidic gas meter which has such a shutoff valve.

The fluidic gas meter shown in FIG. 12 comprises a main body 110 having an inlet portion 111 for receiving gas and an outlet portion 112 for discharging gas. Body 1
A partition 113 is provided in the chamber 10, and a first gas flow path 114 is formed between the partition 113 and the inlet 111.
The second gas flow path 11 is provided between the partition wall 113 and the outlet 112.
5 is formed. First gas passage 11 of the partition wall 113
A shutoff valve 140 is provided on the fourth side. This shutoff valve 1
40 has a valve seat 116 provided on the partition wall 113, and this valve seat 116 has an opening 116a through which gas passes.

In the second gas channel 115, the inlet portion 11
A nozzle 121 is provided for passing the gas received from the nozzle 1 to generate a jet flow. On the downstream side of the nozzle 121, a pair of side walls 123, 12 forming an enlarged flow path.
4 are provided. A predetermined space is provided between the side walls 123 and 124, and the first target 12 is provided on the upstream side.
5, 2nd target 126 is each arrange | positioned at the downstream side. The nozzle 121 is provided outside the side walls 123 and 124.
The return guide 1 which forms a pair of feedback flow paths 127 and 128 for returning the gas that has passed through the side walls 123 and 124 to the ejection port side of the nozzle 121 along the outer peripheral portions thereof.
29 are provided. Feedback channels 127, 1
A pair of discharge paths 131 and 132 are formed between the outlet portion of each of the 28 and the outlet portion 112 by the back surface of the return guide 129 and the main body 110. In the vicinity of the ejection port of the nozzle 121, pressure guiding holes 133, 134 leading to a piezoelectric film sensor for detecting switching of the flowing direction of the gas passing through the nozzle 121 are provided.

FIG. 13 is an enlarged sectional view showing the shutoff valve 140 in FIG. This shutoff valve 140 has a first
Main gas valve 141, which is disposed in the gas flow path 114 of the first gas flow path 114 and covers the opening 116a, is disposed in the first gas flow path 114 and is coupled to the main valve 141, and the gas storage chamber 1
A container 142 forming 43, a first hole 144 provided in the container 142 for communicating the outside of the container 142 with the gas storage chamber 143, and a main valve 141 provided with the opening 116a and the gas storage chamber. A second hole 145 communicating with the second hole 145 and the second hole 145 provided in the gas storage chamber 143.
And a sub valve 146 capable of closing 45. The second hole 145 has a smaller diameter than the opening 116a, and the first hole 1
44 has substantially the same diameter as the second hole 145.

One ends of two rods 147a and 147b are connected to the end of the container 142 on the side opposite to the main valve 141. The other ends of the rods 147a and 147b are
The main valve drive actuators 148a and 148b provided outside the main body 110 are connected to the main valve 110 through the side wall of the main body 110. One end of a rod 149 is connected to the sub valve 146. The other end of the rod 149 is inserted into the first hole 144, penetrates the side wall of the main body 110,
It is connected to an auxiliary valve drive actuator 150 provided outside the main body 110.

A spring 151 for urging the main valve 141 toward the opening 116a is provided around the container 142 between the back surface of the main valve 141 and the side wall of the main body 110. A flange portion 149a is formed in the middle of the rod 149,
A sub valve 146 is provided around the rod 149 between the flange portion 149a and the side wall of the main body 110 to form the second hole 1.
A spring 152 for urging to the 45 side is provided.

In the shutoff valve 140, the main valve drive actuators 148a and 148b and the sub valve drive actuator 1
50 to drive the main valve 141 and the sub valve 146,
As shown in FIG. 13, the main valve 141 covers the opening 116 a and the sub valve 146 opens the second hole 145 in the first state, and as shown in FIG. 14, the main valve 141 opens the opening 116.
The second state in which a is opened and the main valve 1 as shown in FIG.
It is possible to select a third state in which 41 covers the opening 116a and the auxiliary valve 146 closes the second hole 145. In the first state shown in FIG. 13, the gas 153 is in the first state.
Through the hole 144, the gas storage chamber 143, and the second hole 145, while the pressure fluctuation of the gas 153 is reduced.
In the second state shown in FIG. 14, the gas 153 passes through the opening 116a as it is. In addition, the third shown in FIG.
In this state, the gas flow is cut off.

[0012]

When the shutoff valve 140 is used, normally, in the first state shown in FIG.
It is desirable to be able to reduce gas pressure fluctuations, but when the gas flow rate is high, gas supply failure may occur in the first state, and as a result, igniting may be extinguished or ignition failure may occur. . Therefore, when the gas flow rate is high, the second state shown in FIG. 14 must be set, and when the gas flow rate is reduced, it is necessary to return to the first state shown in FIG. As described above, when the gas is used, the shutoff valve 140 is frequently switched between the first state and the second state according to the flow rate of the gas.

As described above, the shutoff valve 14 is operated according to the flow rate of the gas.
When switching the 0 state, the main valve drive actuator 1
It is necessary to drive the main valve 141 by 48a and 148b. However, the main valve 141 is heavier than the sub valve 146, and the power consumption required for driving is large. Therefore, the amount of electric power required for the main valve drive actuators 148a and 148b becomes large, and there is a problem that it is necessary to use a large battery.

The present invention has been made in view of the above problems, and an object thereof is to reduce the drive power of the main valve in a shutoff valve for a gas meter which can reduce the influence of gas pressure fluctuations on the gas meter. The purpose of the present invention is to provide a shutoff valve for a gas meter that can reduce the overall power consumption.

[0015]

A shutoff valve for a gas meter according to claim 1 has a valve seat having an opening through which a gas passes in a gas flow passage in the gas meter, and an opening arranged downstream of the opening. A main valve for covering the portion, a container disposed in the gas flow path and coupled to the main valve to form a gas storage chamber inside, and a main valve provided with an opening and a gas storage chamber. A first hole communicating with the second hole, a second hole provided in the container for communicating the outside of the container with the gas storage chamber, and a sub valve provided in the container for closing the first hole, Drive the main valve,
A main valve drive means for selecting a state where the main valve covers the opening and a state where the main valve opens the opening; and a sub valve that drives the main valve to cover the opening and the sub valve to the first hole. To open the valve to reduce gas pressure fluctuations and to select a state in which the auxiliary valve biases the main valve toward the opening so that the main valve covers the opening and the auxiliary valve closes the first hole. A sub-valve driving means other than the main-valve driving means is provided.

In this gas meter shut-off valve, when the main valve covers the opening and the sub-valve opens the first hole by the main valve driving means and the sub-valve driving means, the gas is the first gas.
Through the hole, the gas storage chamber and the second hole, the pressure fluctuation of the gas being reduced. From this state, if the main valve is driven by the main valve drive means and the state in which the main valve opens the opening is selected, defective gas supply at a high gas flow rate is prevented. Further, the sub-valve driving means drives the sub-valve, and the sub-valve urges the main valve toward the opening side so that the main valve covers the opening and the sub-valve closes the first hole. Then, the flow of gas is cut off. In this gas meter shutoff valve, since the main valve is arranged on the downstream side of the opening, when the gas flow rate is high, the main valve receives a force in the direction of opening the opening due to the pressure of the gas. Therefore,
The main valve drive means requires less force to drive the main valve in the direction of opening the opening. Further, when shutting off the flow of gas, the sub-valve driving means causes the sub-valve to urge the main valve toward the opening, whereby the main valve covers the opening and the sub-valve closes the first hole. Since the state can be set to the above state, the force of the main valve drive means required to maintain the state where the main valve covers the opening can be small. As a result, the force of the main valve drive means required to drive the main valve in the direction of opening the opening can be further reduced. From the above, the drive power of the main valve can be reduced.

A shutoff valve for a gas meter according to a second aspect of the invention is arranged such that a central axis thereof is oriented in a substantially vertical direction in a gas flow passage in the gas meter, and has an opening through which gas passes from a lower side to an upper side. A valve seat that has, a main valve that is arranged on the downstream side of the opening and that can be lowered by its own weight to cover the opening, and a main valve that is arranged in the gas flow path and is coupled to the main valve and contains gas inside. A container forming a chamber, a first hole provided in the main valve for communicating the opening with the gas storage chamber, and a second hole provided in the container for communicating the outside of the container with the gas storage chamber. And a sub-valve disposed in the container capable of closing the first hole, and a state in which the main valve is driven and the main valve covers the opening and the main valve opens the opening. Main valve drive means,
When the auxiliary valve is driven, the main valve covers the opening and the auxiliary valve opens the first hole to reduce the gas pressure fluctuation, and the auxiliary valve urges the main valve toward the opening. valve selects a state and the sub-valve covers the opening portion is closed the first hole, the
The main valve drive means and the auxiliary valve drive means other than the main valve drive means are provided.

In this shutoff valve for a gas meter, when the main valve covers the opening and the sub valve opens the first hole by the sub valve driving means, the gas is in the first hole, the gas storage chamber and the first hole. 2 through which the pressure fluctuations of the gas are reduced. From this state, if the main valve is driven by the main valve drive means and the state in which the main valve opens the opening is selected, defective gas supply at a high gas flow rate is prevented. Further, the sub-valve driving means drives the sub-valve, and the sub-valve urges the main valve toward the opening side so that the main valve covers the opening and the sub-valve closes the first hole. Then, the flow of gas is cut off. In this gas meter shutoff valve, since the main valve is arranged on the downstream side of the opening, when the gas flow rate is high, the main valve receives a force in the direction of opening the opening due to the pressure of the gas. Therefore, the force of the main valve drive means required to drive the main valve in the direction of opening the opening can be small. Further, since the main valve can descend by its own weight to cover the opening, the force of the main valve driving means required to drive the main valve in the direction of covering the opening can be small, and
In the state where the main valve covers the opening and the sub-valve opens the first hole, the force of the main valve driving means required to maintain the state where the main valve covers the opening is small, and further, The force of the main valve drive means required to drive the main valve in the direction of opening the opening may be small. Further, when shutting off the flow of gas, the sub-valve driving means causes the sub-valve to bias the main valve toward the opening, so that the main valve covers the opening and the sub-valve moves to the first position.
Since the hole of the main valve can be closed, the force of the main valve drive means required to maintain the state where the main valve covers the opening is small. As a result, the force of the main valve drive means required to drive the main valve in the direction of opening the opening can be further reduced. From the above, the drive power of the main valve can be reduced.

A shutoff valve for a gas meter according to a third aspect of the invention is arranged such that a central axis thereof is oriented in a substantially vertical direction in a gas passage in the gas meter, and has an opening through which gas passes from a lower side to an upper side. It has a valve seat and a downstream side of the opening. When no external force is applied, the valve seat descends by its own weight to cover the opening, and when the gas pressure is equal to or higher than a predetermined value, it rises by the gas pressure to open the opening. A main valve, a container that is disposed in the gas flow path and is coupled to the main valve, and that forms a gas storage chamber inside; and a first valve that is provided in the main valve and that connects the opening and the gas storage chamber. A hole; a second hole provided in the container for communicating the outside of the container with the gas storage chamber; a sub valve provided in the container for closing the first hole; and a sub valve for driving the sub valve. ,
The state where the main valve covers the opening and the sub-valve opens the first hole to reduce the gas pressure fluctuation, and the main valve covers the opening by urging the main valve toward the opening. And the auxiliary valve is the first
And a sub-valve driving means for selecting whether the hole is closed or not.

In this gas meter shutoff valve, when the main valve covers the opening and the sub-valve opens the first hole by the sub-valve driving means, the gas is in the first hole, the gas storage chamber and the first hole. 2 through which the pressure fluctuations of the gas are reduced. From this state, when the gas flow rate increases and the gas pressure becomes equal to or higher than a predetermined value, the gas pressure causes the main valve to rise and open the opening, thereby preventing gas supply failure when the gas flow rate is high. Further, the sub-valve driving means drives the sub-valve, and the sub-valve urges the main valve toward the opening side so that the main valve covers the opening and the sub-valve closes the first hole. Then, the flow of gas is cut off. In this gas meter shutoff valve, the main valve is arranged on the downstream side of the opening, and when the external force is not applied, it falls by its own weight to cover the opening, and when the gas pressure is equal to or higher than a predetermined value, it rises due to the gas pressure. When opening the opening part and shutting off the gas flow, the auxiliary valve driving means biases the main valve toward the opening part so that the main valve covers the opening part and the auxiliary valve is opened. Since the first hole can be closed,
The main valve drive means becomes unnecessary, and the electric power for driving the main valve becomes unnecessary.

A shutoff valve for a gas meter according to a fourth aspect is the shutoff valve for a gas meter according to any one of the first to third aspects, in which the main valve covers the opening and the auxiliary valve opens the first hole. In order to stabilize the temperature, a magnet for generating an attractive force between the main valve and the opening is further provided.

In this shutoff valve drive device for a gas meter, a suction force is generated between the main valve and the opening by the magnet, and the suction force causes the main valve to cover the opening and the sub valve to open the first hole. The state is stabilized.

[0023]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a sectional view showing the structure of a fluidic gas meter including a gas meter shutoff valve according to a first embodiment of the present invention. As shown in this figure, the fluidic gas meter comprises a body 10 having an inlet 11 for receiving gas and an outlet 12 for discharging gas.
A partition wall 13 arranged in the horizontal direction is provided in the main body 10, a first gas flow passage 14 is formed between the partition wall 13 and the inlet portion 11, and a partition wall 13 is provided between the partition wall 13 and the outlet portion 12. Second
The gas flow path 15 is formed. A shutoff valve 40 is provided above the partition wall 13. This shutoff valve 40 is a partition 1
3 is provided with a valve seat 16 disposed so that its central axis is oriented in a substantially vertical direction, and has an opening 16a through which gas passes from the lower side to the upper side. There is.

In the second gas passage 15, there is provided a nozzle 21 which allows the gas received from the inlet 11 to pass therethrough to generate a jet flow. On the downstream side of the nozzle 21, a pair of side walls 23 and 24 that form an enlarged flow path are provided. A first target 25 is arranged on the upstream side and a second target 26 is arranged on the downstream side, with a predetermined gap between the side walls 23 and 24. Side walls 23, 24
The gas that has passed through the nozzle 21 is provided outside each of the side walls 23,
A return guide 29 is provided along the outer periphery of 24 to form a pair of feedback flow paths 27, 28 for returning to the ejection port side of the nozzle 21. A pair of discharge passages 31 and 32 are formed between the outlet portions of the feedback flow passages 27 and 28 and the outlet portion 12 by the back surface of the return guide 29 and the main body 10. In the vicinity of the ejection port of the nozzle 21, pressure guiding holes 33, 34 leading to a piezoelectric film sensor for detecting switching of the flowing direction of the gas passing through the nozzle 21 are provided.

2 to 4 show the shut-off valve 4 in FIG.
It is sectional drawing which expands and shows 0. The shutoff valve 40 is arranged in the second gas flow passage 15, and is arranged in the second gas flow passage 15 and is connected to the main valve 41 for covering the opening 16 a. And a container 42 having a gas storage chamber 43 formed therein, a first hole 44 provided in the main valve 41 for communicating the opening 16a with the gas storage chamber 43, and the container 4
A second hole 45 which is provided in No. 2 and which communicates the outside of the container 42 with the gas storage chamber 43, and a sub valve 46 which is disposed in the gas storage chamber 43 and can close the first hole 44. I have it. The diameter of the first hole 44 is smaller than that of the opening 16a, and the diameter of the second hole 45 is substantially the same as that of the first hole 44.

One ends of two rods 47a and 47b are connected to the end of the container 42 opposite to the main valve 41. The other ends of the rods 47a and 47b penetrate the side wall of the main body 10 and are connected to main valve drive actuators 48a and 48b provided outside the main body 10. One end of a rod 49 is connected to the sub valve 46. The other end side of the rod 49 is inserted into the second hole 45, penetrates the side wall of the main body 10, and is connected to the auxiliary valve drive actuator 50 provided outside the main body 10.

A spring 51 for urging the main valve 41 toward the opening 16a is provided around the container 42 between the back surface of the main valve 41 and the side wall of the main body 10. A flange portion 49a is formed in the middle of the rod 49.
A spring 52 that biases the auxiliary valve 46 toward the first hole 44 is provided around the rod 49 between the side wall 9 a and the side wall of the main body 10.

Main valve drive actuators 48a, 48b
Drives the main valve 41 via rods 47a and 47b,
The state where the main valve 41 covers the opening 16a and the state where the main valve 41 opens the opening 16a are selected. The sub-valve drive actuator 50 drives the sub-valve 46 via the rod 49, the main valve 41 covers the opening 16 a and the sub-valve 46 opens the first hole 44, and the sub-valve 46 opens the main valve 41. The main valve 41 covers the opening 16a and the sub-valve 46 causes the first hole 44 to move.
It is designed to select the closed state.

In the shutoff valve 40, the main valve drive actuators 48a and 48b and the sub valve drive actuator 50 drive the main valve 41 and the sub valve 46, and the main valve 41 opens the opening 16a as shown in FIG. A first state in which the auxiliary valve 46 covers and opens the first hole 44, a second state in which the main valve 41 opens the opening 16a as shown in FIG. 3, and a main valve as shown in FIG. It is possible to select a third state in which 41 covers the opening 16a and the sub-valve 46 closes the first hole 44. In the first state shown in FIG. 2, the gas 5
3 is a first hole 44, a gas storage chamber 43 and a second hole 45.
Through which the pressure fluctuations of the gas 53 are reduced.
In the second state shown in FIG. 3, the gas 53 passes through the opening 16a as it is. In the third state shown in FIG. 4, the gas flow is cut off.

FIG. 5 is an enlarged sectional view showing a section including the pressure guiding holes 33 and 34 and the piezoelectric film sensor in FIG. As shown in this figure, on the outside of the bottom of the main body 10,
A piezoelectric film sensor 35 is provided. Pressure guide holes 33, 34
One end of the pressure guiding tubes 36 and 37 is connected to each. The other ends of the pressure guiding tubes 36 and 37 are connected to the piezoelectric film sensor 35.
Is connected to each pressure inlet. The piezoelectric film sensor 35 detects the pressure difference between the pressure guiding hole 33 and the pressure guiding hole 34, and the fluidic oscillation is detected based on the change in the pressure difference. Impulse pipe 36,3
7 and the piezoelectric film sensor 35 are covered with a case 38 fixed to the outside of the bottom of the main body 10.

FIG. 6 is a block diagram showing the configuration of the circuit portion of the fluidic gas meter shown in FIG. As shown in this figure, the fluidic gas meter includes an amplifier circuit 54 that amplifies the output signal of the piezoelectric film sensor 35, a waveform shaping circuit 55 that waveform-shapes the output of the amplifier circuit 54 and generates a pulse, and this waveform. A flow rate calculation unit 56 that calculates a flow rate and an integrated flow rate from the cycle of the pulse output from the shaping circuit 55, a display unit 57 that displays the integrated flow rate obtained by the flow rate calculation unit 56, and a flow rate calculation unit 56. Main valve drive actuator 4 based on
8a and 48b and the auxiliary valve drive actuator 50, and a shutoff valve control unit 58 that selects the state of the shutoff valve 40. The shutoff valve control unit 58 is configured to shut off the shutoff valve 40 when the flow rate calculated by the flow rate calculation unit 56 is equal to or less than a predetermined value.
Is set to the first state, and the shutoff valve 40 is set to the second state when the flow rate calculated by the flow rate calculation unit 56 exceeds a predetermined value.
In this case, the shutoff valve 40 is set to the third state when there is an abnormality such as when the flow rate calculation unit 56 detects a flow rate of a predetermined amount or more or when the flow rate is detected for a predetermined time or more. ing.

The flow rate calculation unit 56 and the shutoff valve control unit 58 are realized by, for example, a microcomputer.

7 and 8 are explanatory views showing an example of the structure of the auxiliary valve drive actuator 50, and FIG. 7 shows the auxiliary valve 46.
8 corresponds to the open state, and FIG. 8 corresponds to the closed state of the sub valve 46. The sub-valve drive actuator 50 includes a housing 61 made of a magnetic material. The housing 61 is formed in a cylindrical shape having a small diameter on the lower side and a cylindrical shape having a large diameter on the upper side, and has a lower end opened and an upper end closed. A flange portion 62 is fixed to the outside of the central portion of the housing 61 in the vertical direction. This flange portion 62 is shown in FIG.
It is fixed to the main body 10 at. A cylindrical permanent magnet 63 is provided on the lower side of the housing 61, and a coil 64 serving as an electromagnet is provided on the upper side of the housing 61. A plunger 65 is axially movably inserted in a hollow portion formed by the permanent magnet 63 and the coil 64. The plunger 65 has a lower magnetic portion 65a made of a magnetic material and an upper non-magnetic portion 65b made of a non-magnetic material. This plunger 6
The lower end of 5 projects from the lower end of the housing 61, and the rod 49 is connected to the lower end of the plunger 65.

The auxiliary valve drive actuator 50 has two interlocking switches 71 and 72. Switch 71
The movable contact 71a is connected to the positive electrode of the battery 73, and the movable contact 72a of the switch 72 is connected to the negative electrode of the battery 73. First fixed contact 71 of switch 71
b and the third fixed contact 72d of the switch 72 are the coil 64
The third fixed contact 71d of the switch 71 and the first fixed contact 72b of the switch 72 are connected to one power source terminal of the coil 71, and are connected to the other power source terminal of the coil 64. Nothing is connected to the second fixed contact 71c of the switch 71 and the second fixed contact 72c of the switch 72. Switch 7
1, 72 are switched by a shutoff valve drive signal 74 from the shutoff valve control unit 58 shown in FIG.

This sub-valve drive actuator 50 has a first
7 is selected, the movable contacts 71a, 72a of the switches 71, 72 are connected to the fixed contacts 71c, 72c as shown in FIG. 7, and no current flows through the coil 64. Further, the magnetic force of the permanent magnet 63 acts as shown by the arrow 75, the plunger 65 is retracted, and as a result, the auxiliary valve 46 opens the first hole 44, as shown in FIG.

When the sub valve drive actuator 50 is selected from the first state to the third state, as shown in FIG. 8, the movable contacts 71a and 72a of the switches 71 and 72 are moved.
Is connected to the fixed contacts 71b and 72b, a current is passed through the coil 64, and a magnetic field that cancels the magnetic field generated by the permanent magnet 63 is generated. The magnetic force generated by the coil 64 is indicated by a dashed arrow 77. Then, the plunger 65 projects due to the force of the spring 52 shown in FIG. 2, and the sub valve 46 opens the main valve 41 into the opening 16a.
The main valve 41 covers the opening 16a and the sub-valve 46 closes the first hole 44 by urging it toward the side. In this way, the third state is maintained by the force of the spring 52 used to drive the sub valve 46, and thus the spring 52 is stronger than the spring 152 shown in FIG.

The sub-valve drive actuator 50 switches the switch 7 when the first state is selected from the third state.
1, 72 movable contacts 71a, 72a are fixed contacts 71d,
When connecting to 72d, a current in the opposite direction to that in the case of changing from the first state to the third state is passed through the coil 64, and the permanent magnet 63
Generates a magnetic field that enhances the magnetic field. As a result, the force of the spring 52 is overcome and the plunger 65 is retracted, and the auxiliary valve 46 opens the first hole 44.

The main valve drive actuators 48a, 4a
The configuration of 8b is similar to that of the auxiliary valve drive actuator 50.

Next, the main operation of the fluidic gas meter will be described.

The gas received from the inlet 11 of the fluidic gas meter passes through the first gas passage 14 and the opening 16a and then enters the second gas passage 15. The gas that has entered the second gas flow path 15 passes through the nozzle 21, becomes a jet flow, and is jetted from the nozzle 21. The gas ejected from the nozzle 21 flows along one side wall due to the Coanda effect. Here, it shall first flow along the side wall 23. The gas flowing along the side wall 23 is further returned to the ejection port side of the nozzle 21 via the feedback flow path 27, and is discharged from the outlet portion 12 via the discharge path 31. At this time, the gas ejected from the nozzle 21 is changed in direction by the gas flowing through the feedback flow path 27, and now flows along the other side wall 24.
This gas is further returned to the ejection port side of the nozzle 21 via the feedback flow path 28, and is discharged from the outlet section 12 via the discharge path 32. Then, the direction of the gas ejected from the nozzle 21 is changed by the gas flowing through the feedback flow path 28, and the gas flows again along the side wall 23 and the feedback flow path 27. By repeating the above operation, fluidic oscillation occurs in which the gas passing through the nozzle 21 alternately flows through the pair of feedback flow paths 27 and 28. The frequency and period of this fluidic oscillation have a correlation with the flow rate.

The fluidic oscillation is generated by the piezoelectric film sensor 35.
Detected by. The output of the piezoelectric film sensor 35 is amplified by the amplifier circuit 54, and the waveform shaping circuit 55 generates a pulse having a frequency of fluidic oscillation, that is, a frequency corresponding to the gas flow rate. The flow rate calculation unit 56 calculates the flow rate and the integrated flow rate based on the cycle of the pulse generated by the waveform shaping circuit 55. The integrated flow rate calculated by the flow rate calculation unit 56 is displayed on the display unit 57.

Next, the operation of the shutoff valve 40 according to this embodiment will be described.

The shutoff valve control unit 58 controls the shutoff valve 40 when the flow rate calculated by the flow rate calculation unit 56 is less than a predetermined value.
Is set to the first state shown in FIG. In this first state, the gas 53 enters the gas storage chamber 43 through the first hole 44, passes through the gas storage chamber 43, passes through the second hole 45 and the opening 16a, and passes through the first gas. From the flow path 14 enters the second gas flow path 15. In this case, the first hole 44 and the second hole
The hole 45 of the above acts as a diaphragm. When the gas whose pressure fluctuates passes through the first hole 44, the gas storage chamber 43 and the second hole 45, the first hole 44 acts as a throttle in the preceding stage.
The pulsating component of the pressure fluctuation is reduced at, and the action of mutually canceling the pulsating component occurs in the second hole 45, and the pulsating component is reduced.

The shut-off valve control unit 58 sets the shut-off valve 40 to the second state shown in FIG. 3 when the flow rate calculated by the flow rate calculation unit 56 exceeds a predetermined value. At this time,
The main valve drive actuators 48a and 48b have openings 16
The main valve 41 is driven in the direction of opening a. In this second state, the gas 53 passes through the opening 16a as it is, so that a defective gas supply when the gas flow rate is high is prevented.

Further, the shut-off valve control unit 58 controls the shut-off valve 40 in FIG. 4 in the event of an abnormality such as when the flow rate calculation unit 56 detects a flow rate of a predetermined amount or more or when the flow rate is detected for a predetermined time or more. It is set to the third state shown. At this time,
The sub-valve drive actuator 50 drives the sub-valve 46 in the direction of closing the first hole 44. As a result, the sub valve 46 biases the main valve 41 toward the opening 16a, the main valve 41 covers the opening 16a, and the sub valve 46 closes the first hole 44.
In this third state, the gas flow is cut off.

As described above, according to this embodiment,
Since the main valve 41 is arranged on the downstream side of the opening 16a, when the gas flow rate is high, the main valve 41 receives a force in the direction of opening the opening 16a due to the pressure of the gas. Therefore, the force required for the main valve drive actuators 48a and 48b to drive the main valve 41 in the direction of opening the opening 16a can be small.

When shutting off the gas flow, the auxiliary valve drive actuator 50 causes the auxiliary valve 46 to move to the main valve 41.
The main valve 41 can cover the opening 16a and the auxiliary valve 46 can close the first hole 44 by urging the valve 16 toward the opening 16a. Therefore, in the third state, the main valve 41 is opened in the opening portion 1 while ensuring a sufficient shutoff property.
The force of the main valve drive actuators 48a and 48b required to maintain the state of covering 6a is small. That is, the force of the spring 51 can be made weaker than that of the spring 151 in the shutoff valve 140 shown in FIG. As a result, the main valve drive actuators 48a and 48b can reduce the force required to drive the main valve 41 in the direction of opening the opening 16a.

From the above, it is possible to greatly reduce the electric power required for the opening / closing operation of the main valve 41, which does not require the shutoff property but is frequently performed each time the gas is used. Although the power consumption of the auxiliary valve drive actuator 50 is large in the operation to the third state where the shutoff property is required, the number of operations to the third state is extremely small. Therefore, the overall power consumption of the shutoff valve 40 can be significantly reduced.

FIG. 9 is a sectional view showing a shutoff valve according to the second embodiment of the present invention. The shutoff valve 40 of the present embodiment is obtained by removing the spring 51 from the shutoff valve 40 of the first embodiment shown in FIG. In addition, the main valve 41 descends by its own weight and moves downward when the main valve drive actuators 48a and 48b select the first or third state.
It is designed to cover. Other configurations are similar to those of the first embodiment.

In this embodiment, since the spring 51 is removed and the main valve 41 can be lowered by its own weight to cover the opening 16a, the main valve drive actuators 48a, 48a.
b is the force necessary to drive the main valve 41 in the direction to cover the opening 16a and the main valve 4 in the direction to open the opening 16a.
The force required to drive 1 is smaller than in the first embodiment. Therefore, it is possible to further reduce the electric power required for the opening / closing operation of the main valve 41, and it is possible to further reduce the overall power consumption of the shutoff valve 40. Other operations and effects are similar to those of the first embodiment.

FIG. 10 is a sectional view showing a shutoff valve according to a third embodiment of the present invention. The shutoff valve 40 of this embodiment is shown in FIG.
The main valve drive actuators 48a and 48b are removed from the shutoff valve 40 in the second embodiment shown in FIG. The main valve 41 is lowered by its own weight to cover the opening 16a when no external force is applied, and is raised by the gas pressure to open the opening 16a when the gas pressure is equal to or higher than a predetermined value. . Other configurations are similar to those of the second embodiment.

In the present embodiment, the main valve 41 descends by its own weight to cover the opening 16a when the gas flow rate is small, and rises by the gas pressure to open the opening 16a when the gas flow rate is high. In this way, in this embodiment, since the main valve drive actuators 48a and 48b are unnecessary,
The electric power for driving the main valve 41 becomes unnecessary, and the shutoff valve 4
The overall power consumption at 0 can be further reduced. Other operations and effects are similar to those of the second embodiment.

FIG. 11 is a sectional view showing a shutoff valve according to the fourth embodiment of the present invention. The shutoff valve 40 of this embodiment is shown in FIG.
In the shutoff valve 40 in the first embodiment shown in FIG. 5, a magnetic material such as iron material is used for the main valve 41 in order to increase the shutoff force of the main valve 41 in the first state and stabilize the first state. In addition, a permanent magnet 80 is provided below the opening 16a. The attraction force generated by the main valve 41 and the permanent magnet 80 is set to be smaller than that of the spring 151 in the shutoff valve 140 shown in FIG. The other structure is similar to that of the first embodiment.

In this embodiment, the suction force is generated between the main valve 41 and the opening 16a by the main valve 41 and the magnet 80,
This suction force increases the shutoff force of the main valve 41 in the first state, and stabilizes the first state. Other operations and effects are similar to those of the first embodiment.

In the second or third embodiment as well, a magnetic material such as iron is used for the main valve 41 and a permanent magnet 80 is provided below the opening 16a to stabilize the first state. You may make it change.

The present invention is not limited to the above embodiment,
For example, the main valve drive actuators 48a and 48b and the sub valve drive actuator 50 may be configured to move the rod back and forth by using a motor such as a pulse motor and a screw.

[0058]

As described above, according to the gas meter shut-off valve of the first aspect, in the gas meter shut-off valve capable of reducing the influence of pressure fluctuation on the gas meter, the main valve is located downstream of the opening. Since the main valve receives the force in the direction to open the opening due to the pressure of the gas when the gas flow rate is high, the force required for the main valve drive means to drive the main valve in the direction to open the opening. Can be small. Further, when shutting off the flow of gas, the sub-valve driving means causes the sub-valve to urge the main valve toward the opening, whereby the main valve covers the opening and the sub-valve closes the first hole. Since the state can be set to the above state, the force of the main valve drive means required to maintain the state where the main valve covers the opening can be small. As a result, the force of the main valve drive means required to drive the main valve in the direction of opening the opening can be further reduced. From the above, the drive power of the main valve can be reduced, and the overall power consumption can be reduced.

Further, according to the gas meter shutoff valve of the second aspect, in the gas meter shutoff valve capable of reducing the influence of the pressure fluctuation on the gas meter, the main valve is arranged on the downstream side of the opening portion. When the flow rate is high, the main valve receives a force in the direction of opening the opening due to the pressure of the gas, and the force required for the main valve driving means to drive the main valve in the direction of opening the opening may be small. Further, since the main valve can be lowered by its own weight to cover the opening, the force of the main valve driving means required to drive the main valve in the direction of covering the opening can be small and the main valve can be opened. And the auxiliary valve is the first
In the state where the hole of the main valve is opened, the force of the main valve drive means necessary for maintaining the state where the main valve covers the opening is small, and further, the main valve is driven in the direction of opening the opening. The force of the main valve drive means required for the above is small. Further, when shutting off the flow of gas, the sub-valve driving means causes the sub-valve to urge the main valve toward the opening, whereby the main valve covers the opening and the sub-valve closes the first hole. Since the state can be set to the above state, the force of the main valve drive means required to maintain the state where the main valve covers the opening can be small. As a result, the force of the main valve drive means required to drive the main valve in the direction of opening the opening can be further reduced. From the above, the drive power of the main valve can be reduced, and the overall power consumption can be reduced.

According to the gas meter shutoff valve of the third aspect, in the gas meter shutoff valve capable of reducing the influence of the pressure fluctuation on the gas meter, the main valve is arranged on the downstream side of the opening, and an external force is applied. When it is not added, it is lowered by its own weight to cover the opening, and when the gas pressure is above a predetermined value, it is raised by the gas pressure to open the opening. By the valve drive means, the sub-valve biases the main valve toward the opening so that the main valve can cover the opening and the sub-valve can close the first hole. There is an effect that the valve driving means becomes unnecessary, the electric power for driving the main valve becomes unnecessary, and the overall power consumption can be reduced.

According to another aspect of the shutoff valve for a gas meter of the present invention, in order to stabilize the state in which the main valve covers the opening and the sub valve opens the first hole, the main valve and the opening are stabilized. In addition to the above effects, since a magnet that generates attractive force is provided,
It is possible to stabilize the state in which the main valve covers the opening and the sub-valve opens the first hole.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a configuration of a fluidic gas meter including a gas meter shutoff valve according to a first embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of the shutoff valve in FIG.

FIG. 3 is a cross-sectional view showing another state of the shutoff valve shown in FIG.

FIG. 4 is a sectional view showing still another state of the shutoff valve shown in FIG.

5 is an enlarged sectional view showing a section including the pressure guiding hole and the piezoelectric film sensor in FIG.

6 is a block diagram showing a configuration of a circuit portion of the fluidic gas meter shown in FIG.

FIG. 7 is an explanatory diagram showing an example of a configuration of a sub valve drive actuator in FIG.

FIG. 8 is an explanatory diagram showing another state of the auxiliary valve drive actuator shown in FIG. 7.

FIG. 9 is a sectional view showing a shutoff valve for a gas meter according to a second embodiment of the present invention.

FIG. 10 is a sectional view showing a shutoff valve for a gas meter according to a third embodiment of the present invention.

FIG. 11 is a sectional view showing a shutoff valve for a gas meter according to a fourth embodiment of the present invention.

FIG. 12 is a cross-sectional view showing an example of the configuration of a fluidic gas meter having a shutoff valve capable of reducing gas pressure fluctuations.

FIG. 13 is an enlarged cross-sectional view of the shutoff valve shown in FIG.

14 is a cross-sectional view showing another state of the shutoff valve shown in FIG.

FIG. 15 is a sectional view showing still another state of the shutoff valve shown in FIG.

[Explanation of symbols]

16a opening 40 shut-off valve 41 Main valve 42 containers 43 gas storage room 44 First hole 45 Second hole 46 Vice valve 48a, 48b Main valve drive actuator 50 Sub valve drive actuator

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazumi Onui 9-10, Misonodai, Fujisawa City, Kanagawa Prefecture (72) Inventor Katsuto Sakai 3-2-7-123 Takasago, Katsushika-ku, Tokyo (72) Inventor Hirai Kanji 1-2-70, 1000-year, Atsuta-ku, Nagoya, Aichi Aichi Clock Electric Co., Ltd. (72) Inventor Rikio Kato 23, Kashima, Minamata-cho, Tenryu-shi, Shizuoka Yazaki Keiki Co., Ltd. (72) Inventor Norio Niimura Nara Matsushita Household Equipment Co., Ltd., 800 Tsutsui-cho, Yamatokoriyama City (72) Inventor Masaki Yamaguchi 800 Tsutsui-cho, Yamatokoriyama-shi, Nara Matsushita Household Equipment Co., Ltd. (56) Reference JP-A-7-318382 (JP , A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G01F 1/00-9/02

Claims (4)

(57) [Claims] 1. A valve seat having an opening through which a gas passes in a gas flow passage in a gas meter, a main valve arranged downstream of the opening for covering the opening, and the gas flow passage. A container that is disposed inside and that is coupled to the main valve and that forms a gas storage chamber inside; a first hole that is provided in the main valve and that connects the opening and the gas storage chamber; A second hole provided in the container for communicating the outside of the container with the gas storage chamber; a sub-valve disposed in the container for closing the first hole; and driving the main valve, Main valve driving means for selecting a state in which the main valve covers the opening and a state in which the main valve opens the opening to reduce the gas pressure fluctuation, and the sub valve is driven so that the main valve opens the opening. Cover and sub valve is first
The main valve drive, which selects a state in which the hole is opened and a state in which the auxiliary valve urges the main valve toward the opening to cover the opening and the auxiliary valve closes the first hole. A shutoff valve for a gas meter, characterized in that the shutoff valve for a gas meter is provided with an auxiliary valve drive means separate from the means. 2. A valve seat having a central axis oriented substantially vertically in a gas flow path in a gas meter, the valve seat having an opening through which gas passes from a lower side toward an upper side; A main valve that is arranged on the downstream side and that can be lowered by its own weight to cover the opening; and a container that is arranged in the gas flow path and that is coupled to the main valve and that forms a gas storage chamber inside. A first hole provided in the main valve for communicating the opening and the gas storage chamber; a second hole provided in the container for communicating the outside of the container with the gas storage chamber; A sub-valve disposed in the container and capable of closing the first hole; a main valve that drives the main valve and selects a state in which the main valve covers the opening and a state in which the main valve opens the opening. Valve driving means, driving the sub-valve, the main valve covering the opening and the sub-valve being the first
And a state in which the sub-valve urges the main valve toward the opening so that the main valve covers the opening and the sub-valve closes the first hole. Select ,
A shutoff valve for a gas meter, comprising: a sub-valve driving means other than the main-valve driving means . 3. A valve seat having an opening through which a central axis is oriented in a substantially vertical direction in a gas passage in a gas meter and through which gas passes from a lower side toward an upper side, and the opening of the opening. A main valve which is arranged on the downstream side and which falls by its own weight to cover the opening when no external force is applied, and which rises by the gas pressure to open the opening when the gas pressure is a predetermined value or more; A container that is disposed inside and that is coupled to the main valve and that forms a gas storage chamber inside; a first hole that is provided in the main valve and that connects the opening and the gas storage chamber; A second hole provided in the container for communicating the outside of the container with the gas storage chamber; a sub-valve disposed in the container for closing the first hole; and driving the sub-valve, The main valve covers the opening and the auxiliary valve is the first
And a state in which the sub-valve urges the main valve toward the opening so that the main valve covers the opening and the sub-valve closes the first hole. A shutoff valve for a gas meter, comprising: 4. The main valve further comprises a magnet for generating an attractive force between the main valve and the opening in order to stabilize the state in which the main valve covers the opening and the sub-valve opens the first hole. The shutoff valve for a gas meter according to any one of claims 1 to 3.