JP3365691B2 - Remote reset device for gas meter - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a gas meter with a shutoff valve,
Particularly, the present invention relates to a device for returning to an open state by a remote operation when a shutoff valve of a large gas meter with a shutoff valve used in restaurants and factories is in a closed state.

[0002]

2. Description of the Related Art By attaching a shutoff valve to a gas meter, the gas meter shuts off the gas in the event of an abnormality such as an earthquake, a gas pressure drop, or an excessive gas flow rate, thereby preventing a major accident. The shutoff valve 2 is opened when the shutoff valve 2 is closed and the projecting return shaft 4 provided in the upper housing 1 of the gas meter 18 shown in FIG. 13 is pressed. It is a composition.

A shutoff valve 2 is built in an upper housing 1 of a gas meter 18 shown in FIG.
The gas meter main body 3 enters from 0 through the shut-off valve 2 and is supplied to a gas consuming device (not shown) via the outlet portion 24 after the measurement. The shutoff valve 2 operates integrally with the return shaft 4 as described above.

Conventionally, when the shut-off valve 2 shuts off in the event of an abnormality such as an earthquake, the return shaft cap 12 is removed and the return shaft 4 is pressed in the direction of arrow 5 to return the shut-off valve 2 to the open state. Was. The return shaft cap 12 is attached to the upper housing 1 with a screw 11, and the packing 13 is attached to the screw 1.
1, which protects the return shaft 4 from dust and moisture. Further, in order to prevent the cap 12 from being lost, the holding piece 14
Is integrally molded with the packing 13 and fitted into the cap 12. In this case, the operator had to go near the gas meter 18 for the return operation, and when the gas meter 18 was at a high place, a ladder or the like was needed.

The inventors of the present invention have provided, in Japanese Unexamined Patent Publication (Kokai) No. 5-118457, a remote resetting device for a gas meter which presses the return shaft by remote operation to open the shutoff valve. In this return device, the drive member presses the return shaft to open the shut-off valve, and the buffer member of the flange portion provided near the shut-off valve of the drive member is brought into contact with the limiting means to drive the drive motor. This is detected by an increase in the current of. Further, the return of the drive member to the state where the shutoff valve may be shut off is also detected by the increase in the current of the drive motor due to the contact of the buffer member with the limiting means.

When the shutoff valve is in the closed state, the gas supply pressure (usually 200 to 300 mmH ₂ O) is provided on the upstream side of the shutoff valve.
Is applied, and the downstream side becomes zero (atmospheric pressure) when the gas is in use. Therefore, when the opening of the shutoff valve is started, it is necessary to press the return shaft with the driving member with a force equal to or larger than the pressure difference. The shut-off valve of a small household gas meter has a relatively small pressure receiving area, but a large gas meter has a large pressure receiving area, and the force corresponding to the pressure difference becomes large, so that the motor driving the drive member needs a large output. . The output of the motor is given as a driving force to the driving member via the speed reducer and the gear. When the buffer member and the limiting means come into contact with each other as described above, if the motor output is large, the driving means, especially the deceleration Unreasonable force may be applied to the gear on the machine side and the gear on the drive shaft side, which may damage them.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide a remote reset device for a gas meter, which is capable of returning a shut-off valve of a large-sized gas meter with a shut-off valve from a position remote from the gas meter.

[0008]

According to the present invention, (a) a shutoff valve is provided in the gas passage of a gas meter, the shutoff valve projects a return shaft, and the shutoff valve is opened by pressing the return shaft. In a reset device for a gas meter with a shut-off valve, which is capable of performing (b) a variable output, a motor 53 capable of forward and reverse rotation corresponding to the polarity of a given voltage, and (c) rotated by a motor 53. Nut member 64
(D) The drive member 26 is provided so as to be movable by pressing the return shaft 4 in the displacement direction of the return shaft 4 by screwing the nut member 64 therethrough. Position a1 (t
The movement is restricted at 0, t8), a4 (t5, t6), and the first position a1 (t0, t8) of the drive member 26 is the farthest the drive member 26 moves from the return shaft 4 in the displacement direction. The second position a4 (t5, t6) is a position where the drive member 26 pushes the return shaft 4 with the maximum stroke, and the second position a4 (t5, t6) is from the first position a1 (t0, t8) to the second position. a
The shutoff valve 2 starts to open at an intermediate position (t2) on the way to 4 (t5, t6), and at the second position a4 (t5, t6),
The shutoff valve 2 is a drive member 26 which is in an open state, and (e) a stopper 68 which is fixed to the drive member 26 to allow the drive member 26 to move in the axial direction and prevent the drive member 26 from rotating (f) Changeover switch 4 for changing the polarity of the power supply 63 and (g) the output of the power supply 63
9, (h) resistance, and (i) limit switch 44, which has an actuator 43 that responds to stopper 68 and is displaced against the spring force of spring 46, and is driven by the displacement of this actuator 43. When the member 26 moves from the first position a1 (t0, t8) toward the return shaft 4, the electric power from the change-over switch 49 is supplied to the position a2 (t1) before the intermediate position (t2). , From the position a2 (t1) before this to the position a3 (t3) closer to the return shaft 4 than the intermediate position (t2) from the position a2 (t1) before the switch 53. The electric power is directly applied to the motor 53, and the electric power from the changeover switch 49 is passed through the resistor between the position a3 (t3) near the return shaft 4 and the second position a4 (t5, t6). , Motor 53 Giving, when the second position of the drive member 26 a4 from (t5, t6) to return to the first position a1 (t0, t8), the changeover switch 4
9 is a limit switch 44 for keeping the electric power from the motor 9 supplied to the motor 53 through the resistance, (j) a load current detecting means 50 for detecting the load current of the motor 53, and (k) a processing circuit 59. Then, in order to return the shutoff valve 2 to the open state, the motor 53 is moved from the first position a1 (t0, t8) to the second position a4 (t5, t5).
6) The changeover switch 49 is operated so as to move toward 6), and then, in response to the output of the load current detecting means 50,
When the detected load current increases, the changeover switch 49 is moved so that the drive member 26 moves the motor 26 from the second position a4 (t5, t6) toward the first position a1 (t0, t8). And a processing circuit 59 for switching and operating the remote control device for a gas meter. Further, according to the present invention, a long hole 48 through which a stopper 68 is inserted is formed in the partition plate 39 of the apparatus body 17 provided in the gas meter, and the partition plate 39 has the drive member 26 with respect to the partition plate 39.
The limit switch 44 having the actuator 43 is provided on the side opposite to the side, and the stopper 68 is provided with the circular collar 42 on the side opposite to the drive member 26 with respect to the partition plate 39. Further, in the present invention, the changeover switch 49, the load current detecting means 50, and the processing circuit 59 are provided in the controller 57, the device main body 17 is provided with the motor 53 and the resistor, and the controller 57 and the device main body 17 are provided. Is characterized by being connected by two electric wires 51.

[0009]

According to the present invention, the return shaft cap of the gas meter is removed, the drive member and the device main body 17 having the output variable motor and the like are attached thereto, and the return switch is provided at a position easy to operate away from the gas meter. Connect the power supply, controller and motor. When the return switch is pressed in this state, the return shaft is pressed by the drive member, the shutoff valve is opened, and the drive member returns to the state before the drive. When the shut-off valve starts to open, the shut-off valve is pushed open with a strong force, but at other times, the motor output is reduced, so
At the first and second positions a1 and a4, an unreasonable force does not act on the gear or the like.

Further, according to the present invention, the output of the motor can be easily increased only by increasing the voltage applied to the output variable motor, and the driving member is provided with means for operating the limit switch for raising and lowering the applied voltage. Therefore, the motor 53, the resistor, etc. can be provided in the main body of the apparatus, and the electric wiring between the return switch and the main body of the apparatus can be simplified.

The motor 53 rotates the nut member 64 to drive the driving member 26 by a screw, and the stopper 68 prevents the driving member 26 from being angularly displaced around its axis and rotating, and the stopper 68 works to limit the limit switch. The actuator 43 of 44 is displaced against the spring force of the spring 46. To press the return shaft to change the shutoff valve of the gas meter from the closed state to the open state,
From the first position a1 (t0, t8) of the drive member 26 to the front position a2 (t1) before the midpoint position (t2) at which the shutoff valve 2 starts to open, the motor 53 is provided.
In addition, the power from the changeover switch 49 is supplied through the resistor to reduce the power consumption. The front position a2 (t1) before and after the intermediate position (t2) at which the shutoff valve 2 starts to open.
To a position a closer to the return shaft 4 than the intermediate position (t2)
Up to 3 (t3), the electric power from the changeover switch 49 is directly applied to the motor 53 to increase the output of the motor 53, thereby reliably achieving the start of the open state of the shutoff valve 2. . After that, that is, from the position a3 (t3) near the return shaft 4 to the second position a4 (t5, t6) and from the second position a4 (t5, t6) to the first position a1 (t0, t8). While returning, the electric power from the changeover switch 49 is applied to the motor 53 via the resistance, and power saving is achieved. Furthermore, the first position a1 (t0, t8)
Also, the resistance can prevent an excessive current from being supplied to the motor 53 at the second position a4 (t5, t6). The controller 57 including the changeover switch 49, the load current detection means 50, and the processing circuit 59 includes a motor 53.
Also, the device main body 17 provided with the resistor is connected by two electric wires 51, so that the configuration can be simplified.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A gas meter remote restoration device of the present invention comprises a device body 17 attached to a gas meter, a restoration switch 61 provided at an operation location, a controller 57 and the like.

FIG. 1 is a front view showing a state in which an apparatus main body 17 of one embodiment of the present invention is attached to a gas meter 18, and FIG. 2 is a side view. Gas is supplied from the inlet 20 of the gas meter 18, guided to the gas meter main body 3 through the shutoff valve 2 provided in the upper housing 1, and the gas meter main body 3 measures the gas. 23
Is displayed. The gas that has passed through the gas meter body 3 is supplied from the outlet 24 to consumer equipment (not shown).

The apparatus main body 17 includes a plate-shaped base 27 and a base 2.
And covers 28 attached by screws at the four corners. 3 is a front view of the apparatus main body 17 with the cover 28 removed, and FIG. 4 is a cross-sectional view taken along the section line IV-IV with the cover 28. An insertion hole 29 is formed in the base 27,
Here, the dial 30 is O in the recess in the outer middle of the tubular portion 31.
The ring 32 is attached and inserted. C on the inner side of the substrate
Fit the ring 33. As a result, the dial 30
It is rotatable but does not come off from the base 27. An inner thread is engraved on the cylindrical portion 31, and this is fixed by being screwed into the screw 11 which is screwed into the return shaft cap 12 of the gas meter 18. As a result, the device body 17 is detachably attached to the upper housing 1 of the gas meter 18 integrally. Inside the device body 17, there is a partition plate 39 fixed to the base body 27 with two screws, and on one side (the left side in FIG. 3), a cylindrical collar 42 made of synthetic resin and a limit switch 44 are provided. Yes, the limit switch 44 is the partition plate 3
It is fixed to 9 with screws 45. On the other side of the partition plate 39 (on the right side in FIG. 3), the mounting plate 40 is provided with the partition plate 39 and the base body 2.
7 and 2 are fixed with two screws 36 and 37, respectively. A long screw 37 with a cover is used as the base 27. Between the mounting plate 40 and the base 27, the motor 5 integrally formed
3 and the speed reducer 54 are attached to the mounting plate 40 by screws 38, a bearing 55 is provided through the mounting plate 40, and the drive shaft 56 of the speed reducer 54 is provided in the bearing 55.
Protruding in front of. The first gear 52 is fixed to the drive shaft 56 and meshes with the second gear 65. Also the mounting plate 4
A support piece 62 is provided penetrating 0, and a nut member 64 is inserted inside the support piece 62, and the nut member 64 is fixed to the second gear 65. An inner thread is engraved on the nut member 64, and an outer thread engraved on the hollow cylindrical driving member 26 is screwed into the nut member 64. Return shaft 4 of drive member 26
A collar portion 67 is provided on the side, and a stopper 68 extends outward from the collar portion 67 on the partition plate 39 side. Further, cushioning members 69 and 70 made of an elastic material such as rubber are provided on both sides of the flange 67.

FIG. 5 is a side view of the apparatus main body 17 with the cover 28 removed, as seen from one side. Partition plate 39
The long hole 4 into which the collar 42 attached to the stopper 68 is inserted
8 are provided. Since the collar 42 is inserted into the elongated hole 48, the drive member 26 does not rotate even if the nut member 64 rotates, but moves in the axial direction thereof. The tip of the stopper 68 penetrates the elongated hole 48 and extends to one side of the partition plate 39 (that is, the side opposite to the drive member 26 with respect to the partition plate 39), and the collar 42 has a large-diameter cylindrical shape on that one side. Has become. The drive member 26 moves in the direction of the return shaft 4 by the drive force of the motor 53 via the speed reducer 54, the first gear 52, the second gear 65, and the nut member 64, and the center of the collar 42 moves to the drive member 26. From the position a1 that is farthest away from the return shaft 4 to the position a2, the collar 42 pushes down the actuator 43 of the limit switch 44 as shown in FIG. As a result, the limit switch 44 is turned on,
The driving force of the motor 53 is increased. Stopper 68 is a3
In the position of, the collar 42 does not push the actuator 43, the spring 46 brings the actuator 43 into the same state as in FIG. 5, and the limit switch is turned off. When the drive member 26 pushes the return shaft 4 with the maximum stroke, the stopper 68 comes to the position a4. At this time, the buffer member 69 of the flange portion 67 near the return shaft 4 and the tip of the tubular portion 31 of the dial 30 come into contact with each other, and an excessive current flows to the motor 53. The controller senses this and the motor 53 detects this, as will be described later. Stop once and reverse. As a result, the drive member 26 moves backward from a4 to a1. When the drive member 26 moves backward, the collar 42 comes into contact with the actuator 43, but the actuator 43 bends in the middle as shown in FIG. 7 and the limit switch 44 does not turn on.
When the stopper 68 comes to the position a1, the buffer member 70 provided on the side of the flange portion 67 opposite to the return shaft 4 contacts the support piece 62 and the nut member 64 to increase the electric current of the motor 53, and the controller causes this. The motor 53 is stopped by sensing the increased current.

Since a large number of large gas meters are not used, this device 17 is a large gas meter of different size,
For example, it is preferably shared by N30, N50, N90 and N120. Therefore, a1 to a4 are determined as follows. Distances a1 to a2 from the time when the drive member 26 starts to move until it hits the return shaft 4, that is, play is provided. Large capacity gas meters such as N90 and N12
In No. 0, this is the smallest, 2 mm, so a1-
It is preferable that a2 is 2 mm or less. The distance from a2 to a3 (time t1 to t3 in FIG. 12, which will be described later) is equal to the shutoff valve 2 even during the small capacity N30 (at time t2 in FIG. 12).
Must start to open, for example, preferably 21 mm. This relationship is shown in FIG. In FIG. 8, the dotted line is the play distance of the drive member 26, and the solid line is the stroke distance of pushing the return shaft 4. The thick line indicates that the limit switch 44 is in the ON state.

The motor 53 used in the present invention is preferably a direct current motor which can easily switch between forward rotation and reverse rotation.
A DC motor with a V output of 1.5 W was used. Further, the connection between the limit switch 44, the motor 53 and the power source is preferably that shown in FIG. In this embodiment, when the limit switch 44 is OFF between the limit switch 44 and the motor 53, 30
It has a resistance of Ω. According to this embodiment, only two electric wires may be provided between the controller 57 and the device body 17.

FIG. 10 is a connection diagram showing the electrical construction of the embodiment shown in FIG. 9 of the present invention. The motor 53 and the limit switch 44 provided in the device body 17 are connected to the controller 57 via two electric wires 51. A return switch 61 is provided in the operation room 60, which is convenient for the return operation, and when the return switch 61 is operated, the DC voltage from the power source 63 is applied to the motor 53 via the controller 57. The return switch 61 is operated when returning the shutoff valve 21 to the open state.

The return shaft 4 requires a large force when the shutoff valve 2 starts to open, but at other times, it can be pushed in with a finger. The return shaft 4 is decelerated by the speed reducer 54 and is driven by the drive member 26. Since it is pushed and moved, the motor 53 applies a direct current of 20 V when the shutoff valve 2 is opened, and at other times lowers it to 16 V by a resistance in the apparatus main body 17 for use. Therefore, the power source 63 is preferably a commercial AC power source that is step-down rectified. Reference numeral 49 represents a changeover switch for converting its polarity, and 50 represents load current detection means.

FIG. 11 is a flow chart for explaining the operation of the controller 57 in the embodiment of the present invention. The drive member 26 is in the first position a1 shown in FIG. Further, the shutoff valve 2 shuts off when an earthquake occurs, a pressure drop occurs, or an excessive flow rate occurs. When such an abnormality occurs, the gas consuming equipment is inspected, and after confirming that there is no abnormality, the recovery operation is started.

At step n2, the return switch 61 of the operation room 60 is operated. At step n3, the motor 53
It is rotated in the forward direction by V. At step n4, the motor 5 is controlled by the current detection means 50 provided in the controller 57.
It is determined whether or not the load current i sent to No. 3 exceeds a predetermined current value i1. By rotating the motor 53 in the forward direction, the first gear 52,
The second gear 65 rotates, and the nut member 64 also rotates. The driving member 26 has a collar 4 fixed to it.
Since 2 is fitted in the long hole 48, it is displaced in the forward direction without rotating and thereby presses the return shaft 4. The center of the collar 42 is a1 (time t in FIG. 12 described later).
0) to a2 (time t1 in FIG. 12), the collar 42 sets the limit switch 44 to the ON state, the voltage of 20 V is applied to the motor 53, the driving force thereof is increased, and the driving is performed with a strong force. The shut-off valve 2 is pushed open via the member 26. When the center of the collar 42 comes to the position of a3 (time t3 in FIG. 12), the collar 42 turns off the limit switch 44.
In the F state, a voltage of 16V is applied to the motor 53. The drive member 26 moves to the second position a4 (time t in FIG. 12).
At 5 and t6), the return shaft 4 is returned and the shutoff valve 2 is opened. However, since the voltage of 16 V is applied to the motor 53, the buffer member 69 of the flange portion 67 of the drive member 26 is strongly pressed against the tip of the tubular portion 31, and the buffer member 6
9 is compressed. At this time, the load current i of the motor 53 increases and exceeds the first current value i1. This is detected by the load current detecting means 50, the process proceeds to step n5, the motor 53 is temporarily stopped, the process proceeds to step n6, and the direction of the current sent to the motor 53 is reversed by the changeover switch 49, whereby the motor 53 is reversed. Is rotated in the reverse direction to displace the drive member 26 in the reverse direction. In step n7, the current detection means 50 provided in the controller 57 determines whether or not the load current i sent to the motor 53 exceeds a predetermined current value i2. When the drive member 26 returns to the first position a1 (t8 in FIG. 12), the collar 42 comes into contact with the end of the elongated hole 48, and the cushioning member 70 is strongly pressed against the support piece 62 and the nut member 64. The cushioning member 70 is compressed. At this time, the load current i of the motor 53
Increases and exceeds the second current value i2. This is detected by the load current detecting means 50, the process proceeds to step n8, and the motor 53 is stopped. In this way, the shut-off valve 2 may be shut off in the event of an abnormality such as the occurrence of an earthquake.

As described above, when the buffer members 69, 70 and the tubular portion 31 or the support piece 62 and the nut member 64 contact at the first position and the second position, the motor 53 receives a rated voltage of 20V. As a result, only a voltage of 16 V is applied, and an unreasonable force does not act on the first gear 52, the second gear 65, etc., and these are not damaged. The switching of the voltage applied to the motor 53 is performed by operating the limit switch 44 provided in the apparatus main body 17 in accordance with the movement of the drive member 26. Therefore, the processing circuit 59 realized by the microcomputer in the controller 57 is , Return switch 61 and load current detection means 50
In response to each output from the motor 5
It is possible to make it simple to switch between the forward rotation, the reverse rotation, and the stop.

Further, the voltage applied by the controller 57 at this time, the terminal voltage of the motor 53 and the current are schematically shown in FIG. The solid line L1 shows the voltage applied by the controller 57, the dotted line L2 shows the terminal voltage of the motor 53, and the dashed line L3 shows the current. At t0, the return switch 61 is operated, DC 20V is applied to the apparatus main body 17 from the controller 57 via the electric wire 51, and the voltage of 16V is applied to the motor 53 via the resistor by the OFF contact of the limit switch 44. The motor 53 starts.
At t1, the limit switch 44 is switched to the ON contact, and the voltage of 20 V from the controller 57 is directly applied to the motor 53. Actually, it is slightly low due to the resistance of the electric wire 51 and the like on the way. For example, 20V is applied to the motor 53, and the current decreases by the amount of the voltage increase. At t2, the drive member 26 contacts the return shaft 4 and pushes the shutoff valve 2 open. Therefore, the current increases, but the gas flows in a state where the shutoff valve 2 starts to open slightly, the pressures before and after the shutoff valve 2 become uniform, and the force pushing the return shaft 4 decreases, so the current also decreases. At t3, the limit switch 44 is switched to the OFF contact again, 16V is applied to the motor 53, and the current increases by that amount. At t4, the buffer member 69 of the flange portion 67 of the drive member 26 is moved to the dial 30.
When it contacts the tip of the cylindrical body 31, the load of the motor 53 increases, the current increases, and the voltage decreases. The increase in current at this time is detected by the load current detecting means 50, the voltage applied from the controller 57 becomes 0 at t5, and the motor 53
Will stop. After this, the changeover switch 49 turns the processing circuit 59.
And the voltage applied from the controller 57 is reversed. At t6, the voltage of 20V is applied to the limit switch 44.
The voltage is reduced to 16V at the OFF contact of the motor 53, and the motor 53 is started in reverse. When the drive member 26 moves backward, the limit switch 44 is not switched as described above. Buffer member 7 at t7
0 contacts the support piece 62 and the nut member 64, and the current increases, which is detected by the load current detecting means 50, and the voltage applied from the controller 57 becomes 0 at t8,
The motor 53 stops. After this, the changeover switch 49 is changed over by the processing circuit 59, and the state shown in FIG. 10 is restored.

When the reset device cannot be operated remotely due to a failure of the power source 63 or the controller 57 or disconnection of the electric wire 51, the cap 25 provided on the tip side of the driving member 26 of the cover 28 is removed at the position of the gas meter to remove the driving member. Since 26 is hollow, a return shaft 4 can be pushed open by hand by inserting a driver or the like into it.

[0025]

As described above, according to the present invention, in a large-sized gas meter with a shutoff valve, the shutoff valve shut off in the event of an abnormality can be easily returned from a remote operation room by operating a return switch. At this time, since the shutoff valve is large, a large force is applied to the drive member only when the output variable motor starts to open, and in other cases, the drive member is driven with a relatively small force. Therefore, the drive member is in the second and first positions a.
4, when reaching a1, unreasonable force does not act on the reducer, gears, etc., the motor current increases, and this increased current is sensed, and the drive member pushes the return shaft to open the shutoff valve, and The shutoff valve can be returned to a position where it does not hinder the shutoff. Particularly according to the invention, a screw-driven drive member 2
The actuator 43 of the limit switch 44 is displaced by the stopper 68 that prevents the rotation of the drive shaft 26 about the axis of the drive shaft 6, and the drive member 26 is moved to the first position a1 (t0, t8) and the second position a4.
It automatically reciprocates between (t5, t6), presses the return shaft of the gas meter to open the shutoff valve, and only when the shutoff valve in this closed state is started to open, the changeover switch 4
The electric power from the motor 9 is directly applied to the motor 53 to increase the output of the motor 53. In other cases, the electric power supplied to the motor 53 is reduced by the resistance to reduce the power consumption, and the second position a4 (t5, t5, t5, t5). t6) and the first position a1
At the time of (t0, t8) stop, an excessive current is prevented from flowing to the motor 53.

Further, according to the present invention, the output of the motor can be easily increased / decreased by simply increasing / decreasing the applied voltage, and the means for increasing / decreasing the voltage is provided in the driving member, so that the gas meter located far from the controller can be used. The electric wire between the device main body and the provided device main body can be two simple ones for power supply.

[0027]

[Brief description of drawings]

FIG. 1 is a front view showing a state in which a device body 17 according to an embodiment of the present invention is attached to a gas meter with a shutoff valve.

FIG. 2 is a side view of FIG.

FIG. 3 is a front view of the apparatus body 17 with a cover 28 removed.

4 is a cross-sectional view taken along the section line IV-IV in FIG.

5 is an explanatory diagram showing the relationship between the movement of the collar 42 attached to the drive member 26 and the actuator 43 of the limit switch 44. FIG.

6 is an explanatory diagram showing a state in which a limit switch 44 is turned on by a collar 42 when the drive member 26 moves forward. FIG.

FIG. 7 is an explanatory view showing that the limit switch 44 remains in the OFF state by the collar 42 when the drive member 26 moves backward.

FIG. 8 shows a main body 17 of a commonly used large-scale gas meter.
It is explanatory drawing which shows the relationship between play and stroke when attaching.

9 is a wiring diagram showing an example of means for changing the voltage applied to the output variable motor 53. FIG.

FIG. 10 is an electrical connection diagram of an embodiment of the present invention.

FIG. 11 is a flowchart illustrating the operation of the controller 57 according to the embodiment of the present invention.

FIG. 12 is a graph showing the relationship between voltage, current and time according to an example of the present invention.

FIG. 13 is a perspective view of a gas meter with a shutoff valve.

[Explanation of symbols]

2 Shut-off valve 17 Device body 18 Gas meter with shut-off valve 25 caps 26 Drive member 27 base 28 cover 30 dial 31 tube 39 Partition board 40 mounting plate 42 colors 43 Actuator 44 Limit switch 48 long holes 49 Changeover switch 50 Load current detection means 53 motor 54 reducer 57 Controller 61 Return switch 62 Support piece 63 power supply 64 nut member 67 brim 68 Stopper 69, 70 cushioning member

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Gen Onoda Gen 2-3, Shimura, Itabashi-ku, Tokyo Inside Kinmon Mfg. Co., Ltd. (72) Inventor Masanari Imasaki 4-731 Nishiiwata, Higashi-Osaka City, Osaka Prefecture Kinmon Mfg. Co., Ltd. Kansai Research Institute (56) Reference JP-A-5-118457 (JP, A) JP-A-5-71656 (JP, A) JP-A-6-50444 (JP, A) Actual Kaihei 2- 141081 (JP, U) Actual Kaihei 6-24396 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) G01F 1/00 G01F 3/22 F16K 31/04

Claims (3)

(57) [Claims] (A) A shut-off valve provided in the middle of a gas passage of a gas meter, the shut-off valve projecting a return shaft, and the shut-off valve being opened by pressing the return shaft. In the recovery device of the attached gas meter, (b) a motor 53 whose output is variable and capable of forward and reverse rotation corresponding to the polarity of a given voltage; and (c) a nut member 64 rotated by the motor 53.
And (d) the drive member 26, in which the nut member 64 is inserted and screwed together, and the return shaft 4 is movably provided by pressing the return shaft 4 in the displacement direction of the return shaft 4. Positions a1 (t0, t8), a4 (t
5, the movement is restricted at t6), and the first position a1 (t0, t8) of the drive member 26 is
The drive member 26 is the position farthest from the return shaft 4 in the displacement direction, and the second position a4 (t5, t6) is the position where the drive member 26 pushes the return shaft 4 with the maximum stroke. From the first position a1 (t0, t8) to the second position a4 (t5,
At an intermediate position (t2) on the way to t6), the shutoff valve 2 starts to open, and at the second position a4 (t5, t6), the shutoff valve 2 is in the open state, and the drive member 26 and (e) the drive member. A stopper 68 fixed to No. 26 to allow the drive member 26 to move in the axial direction and prevent the drive member 26 from rotating; (f) the power source 63; and (g) the changeover switch 4 for switching the polarity of the output of the power source 63.
9, (h) resistance, and (i) limit switch 44, which has actuator 43 that responds to stopper 68 and is displaced against the spring force of spring 46.
When the drive member 26 is moved from the first position a1 (t0, t8) toward the return shaft 4 by the displacement of 3, the switching is performed between the intermediate position (t2) and the position a2 (t1) before the intermediate position (t2). Switch 49
From the position a2 (t1) at the front side to the intermediate position (t
The electric power from the changeover switch 49 is directly supplied to the motor 5 until the position a3 (t3) closer to the return shaft 4 than 2).
3 from the position a3 (t3) near the return shaft 4 to the second position a4
During the period from (t5, t6), the electric power from the changeover switch 49 is applied to the motor 53 via the resistance, and the second position a4 (t5, t6) of the drive member 26 to the first position a1 (t0, t0, When returning to t8), the limit switch 44 that keeps the electric power from the changeover switch 49 applied to the motor 53 through the resistance, and (j) the load current detection means 50 that detects the load current of the motor 53, (K) In the processing circuit 59, in order to return the shut-off valve 2 to the open state, the motor 53 is driven by the drive member 26 at the first position a1 (t0,
When the changeover switch 49 is operated so as to move from t8) toward the second position a4 (t5, t6), and thereafter, when the detected load current increases in response to the output of the load current detecting means 50. , The motor, the drive member 26
From the second position a4 (t5, t6) to the first position a1
A remote resetting device for a gas meter, comprising: a processing circuit 59 which operates by switching a changeover switch 49 so as to move toward (t0, t8). 2. An elongated hole 48 through which a stopper 68 is inserted is formed in a partition plate 39 of an apparatus main body 17 provided in a gas meter, and the partition plate 39 has an actuator on the side opposite to the drive member 26 with respect to the partition plate 39. 2. The remote resetting device for a gas meter according to claim 1, wherein a limit switch 44 having 43 is provided, and the stopper 68 is provided with a circular collar 42 opposite to the drive member 26 with respect to the partition plate 39. 3. A changeover switch 49 and a load current detecting means 5
0 and the processing circuit 59 are provided in the controller 57, the device main body 17 is provided with the motor 53 and the resistor, and the controller 57 and the device main body 17 are connected by two electric wires 51. The remote resetting device for a gas meter according to claim 1 or 2, characterized in that: