JP2012137402A - Gas meter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas meter which can simplify the operation for returning a shut-off valve in a closed state to an open state while avoiding a returning operation body from greatly protruding to the outer side of a casing.SOLUTION: In the gas meter, the shut-off valve V is provided which is operated to close at the time of abnormality occurrence and shuts off the a gas passage formed in the casing 1, and a shaft-like returning operation body 11 is also provided by which a valve operating part 10 for operating the shut-off valve V in the closed state to the valve opening side is operated to the opening valve side, and the shut-off valve is returned to the open state. In the casing 1, a movement quantity increasing linkage mechanism K is provided which moves the valve operating part 10 to the valve opening side of the shut-off valve by the movement quantity larger than the unit quantity as the returning operation body 11 is moved by the unit quantity toward the inner side of the casing 1.

Description

  The present invention provides a shut-off valve for closing a gas flow path formed in a casing by closing when an abnormality occurs, and a valve operating unit for operating the shut-off valve in the closed state to the valve opening side. And a shaft-like return operating body that operates to return the shut-off valve to an open state. The return operating body is movable inward and outward of the casing and has one end side portion of the casing. Provided in a state in which the valve operating portion is moved to the inside of the casing from the standby position and is operated to return to the valve-opening side in a state of being urged to return to the standby position protruding outward. The present invention relates to a gas meter.

  Such a gas meter is used when an abnormality occurs such as when the flow rate of gas flowing in the gas flow path in the casing becomes excessive or when the time for which the gas continues to flow through the gas flow path becomes abnormally long. In addition, when the shut-off valve that automatically closes and shuts off the gas flow path is returned to the open state, the return operating body is By operating to move from the standby position toward the inside of the casing, the shut-off valve is returned to the open state.

  As a conventional example of such a gas meter, when the return operating body moves by a unit amount toward the inside of the casing, the return operation is performed so that the intermediate shaft as the valve operating portion for operating the shut-off valve to the valve opening side also moves by the unit amount. The body is provided so as to press the intermediate shaft as the valve operating section, and the cylindrical return shaft presser slidable in the axial direction of the return operation body protrudes outward from the return operation body. The position can be freely changed between the projected position and the retracted position overlapping the return operation body, and the return operation body can be pressed toward the inside of the casing by rotating forward and backward in the protruded position. And a release state in which the pressing is released (see, for example, Patent Document 1).

That is, in the gas meter of Patent Document 1, the return shaft presser is normally set in the retracted posture.
When the shut-off valve that is in the closed state is operated to return to the open state, the return shaft presser in the retracted position is pulled out to the protruding position and then rotated to the pressed state. By pushing and moving the presser toward the inside of the casing, the return shaft can press the intermediate shaft as the valve operating section, and the shut-off valve can be returned to the open state. It is.
In addition, after the operation to return the shut-off valve in the closed state to the open state is completed, the return shaft presser is rotated to the released state and then operated to the retracted position.

  That is, the return operating body moves the shut-off valve from the closed state to the open state by moving from the standby position toward the inside of the casing. Is projected outward from the casing, and the amount of protrusion moves from the standby position toward the inside of the casing to operate the shutoff valve from the closed state to the open state. The length corresponds to the movement amount for opening operation that needs to be performed.

  When the return operating body is provided so as to press the intermediate shaft as the valve operating portion so that the intermediate shaft as the valve operating portion also moves by the unit amount when the return operating body moves by the unit amount, Since the movement amount for opening operation of the operating body is considerably large, if the return operating body protrudes to the outside of the casing by the length corresponding to the opening operation moving amount at the standby position, Since the amount of protrusion from the casing is large, there is a possibility that troubles such as contact with the user may occur.

  In the gas meter of Patent Document 1, when the return shaft presser is operated in the protruding posture, the return shaft presser protrudes outward from the casing by a length corresponding to the above-described opening operation movement amount. However, when the return shaft presser is operated in the retracted position, the amount of protrusion of the return shaft presser or return operating body to the outside of the casing is smaller than the length corresponding to the movement amount for the opening operation described above. Therefore, it is possible to suppress the occurrence of trouble such as the user touching the return shaft presser or the return operating body.

JP 2000-97743 A

  The conventional gas meter can suppress the occurrence of troubles such as the user pressing the return shaft and the return operating body, but when returning the shut-off valve that has been closed to the open state, the retraction posture Pull out the return shaft presser to the protruding position, then rotate the return shaft presser that has been pulled out to switch from the released state to the pressed state, and then turn the return shaft presser toward the inside of the casing. Therefore, when the shut-off valve in the closed state is returned to the open state, a troublesome operation for the return shaft presser is required.

  In addition, after the shut-off valve that has been closed is returned to the open state, the return shaft presser that has been pulled out is rotated to switch from the pressed state to the released state, and then the return shaft presser is It is necessary to move it toward the inside of the casing and switch it to the retracted position. It was necessary.

  That is, in order to return the shut-off valve in the closed state to the open state, the conventional gas meter first requires an operation to bring the return shaft presser into the protruding posture and in the pressed state, and the valve closed state. Even after returning the shut-off valve to the open state, it is necessary to switch the return shaft presser to the retracted position, so that the shut-off valve that has been closed is returned to the open state. The operation is complicated and improvement is desired.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a shut-off valve that is in a closed state while avoiding that the return operating body protrudes outward from the casing. An object of the present invention is to provide a gas meter capable of simplifying the operation for returning to the valve open state.

The gas meter according to the present invention operates a shut-off valve for closing the gas flow path in the casing by closing the valve when an abnormality occurs, and a valve operating unit for operating the shut-off valve in the closed state to the valve opening side. And a shaft-like return operating body for returning the shut-off valve to the open state,
The return operating body is movable to the inside and outside of the casing and is urged to return to a standby position in which one end portion protrudes outward from the casing, and from the standby position to the casing. It is provided in a state in which the valve operating portion is operated to the valve opening side by being moved inward, and its first characteristic configuration is:
A movement amount expansion linkage mechanism that moves the valve operation portion to the valve opening side with a movement amount larger than the unit amount as the return operation body is moved toward the inside of the casing by a unit amount. It is characterized by being provided in the casing.

  That is, when the return operation body is moved toward the inside of the casing, the valve operating portion is moved to a valve opening side of the shut-off valve with a movement amount larger than the movement amount of the return operation body by the movement amount expansion linkage mechanism. And the shut-off valve is returned to the open state.

  In other words, when returning a shut-off valve that has been closed to an open state, the valve operating unit is operated with an opening operation movement amount required to operate the shut-off valve from the closed state to the open state. Although it is necessary to move to the valve opening side of the shut-off valve, the valve operating part is moved by a moving amount larger than the moving amount of the returning operating body by the moving amount expansion linkage mechanism. By moving the operating body from the standby position toward the inside of the casing with a movement amount smaller than the opening operation movement amount of the valve operation portion, the valve operation portion can be moved by the opening operation movement amount. It will be a thing.

  As described above, in order to operate the shut-off valve from the closed state to the open state, the movement amount for moving the return operating body from the standby position toward the inside of the casing is greater than the opening operation movement amount of the valve operation portion. Since the amount of protrusion of the return operating body protruding outward from the casing at the standby position can be reduced at the standby position, the return operating body can be prevented from protruding greatly outside the casing at the standby position. Thus, it is possible to suppress the occurrence of trouble such as the user coming into contact with the return operating body.

  In addition, the operation for returning the shut-off valve in the closed state to the open state may be simply performed by moving the return operating body toward the inside of the casing. The operation for returning the shut-off valve to the open state can be simplified.

  In short, according to the first characteristic configuration of the present invention, it is possible to return the shut-off valve in the closed state to the open state while avoiding the return operating body from protruding largely outward of the casing. A gas meter capable of simplifying operation can be provided.

In addition to the first feature configuration, the second feature configuration of the present invention includes:
An inlet-side flow channel forming member that partitions and forms an inlet-side flow channel portion that extends between the inlet portion and the metering portion in the gas flow channel, and an outlet-side flow channel portion that extends between the metering portion and the outlet portion. An outlet-side flow path forming member is provided in the casing,
The metering unit is configured to meter gas by flowing through the inside;
The movement amount expansion linkage mechanism is provided in a space corresponding to the outside of the inlet-side flow path forming member, the measuring portion, and the outlet-side flow path forming member in the casing. .

That is, the gas supplied to the inlet portion flows to the measuring section through the inlet-side flow path section defined by the inlet-side flow path forming member, and the gas supplied to the measuring section passes through the inside of the measuring section. The gas that is measured while flowing and discharged from the measuring section flows to the outlet portion through the outlet-side flow path portion that is partitioned by the outlet-side flow path forming member.
Accordingly, the gas does not flow in the space corresponding to the outside of the flow path forming member on the inlet side, the measuring portion and the flow path forming member on the outlet side in the casing, and the gas moves to a space where the gas does not flow. A quantity expansion linkage mechanism will be equipped.

  In this way, since the movement amount expansion linkage mechanism is equipped in the space where the gas does not flow, for example, while allowing the gas to flow through the gas flow path, that is, while continuing to consume the gas, the casing is opened, Maintenance can be improved, for example, inspection and adjustment of the movement amount expansion linkage mechanism can be performed.

  In addition, in the space corresponding to the outside of the inlet side flow path forming member, the metering section and the outlet side flow path forming member in the casing, gas does not flow, so when installing the return operating body in the casing, A seal structure that suppresses gas leakage is not required, and the configuration can be simplified.

  In short, according to the second characteristic configuration of the present invention, in addition to the operational effect of the first characteristic configuration, it is possible to improve the maintainability and simplify the configuration in which the return operating body is mounted on the casing. The gas meter which can aim at can be provided.

In addition to the first or second feature configuration described above, the third feature configuration of the present invention includes:
The movement amount expansion linkage mechanism opens with the rotation of the small-diameter pinion portion rotated by the movement of the return operation body inward of the casing, and the valve operation portion. A large-diameter pinion portion that is moved to the valve side is constituted by a linkage pinion provided in an integrally rotated state.

  That is, when the small-diameter pinion part is rotated by the movement of the return operation body inward of the casing, the large-diameter pinion part rotates in a state of rotating integrally with the rotation, and the valve operation part is moved to the valve opening side. By being moved, the valve operating portion is moved to the valve opening side with a movement amount larger than the movement amount of the return operating body.

  The linkage pinion provided with the small-diameter pinion portion and the large-diameter pinion portion in an integrated rotation state has a simple configuration and can be arranged compactly, thereby simplifying and downsizing the movement amount expansion linkage mechanism. Can do.

  In short, according to the third characteristic configuration of the present invention, in addition to the operational effects of the first or second characteristic configuration, it is possible to provide a gas meter capable of simplifying and downsizing the movement amount expansion linkage mechanism.

Cutaway front view of the gas meter of the first embodiment A longitudinal side view of the mounting portion of the shut-off valve of the embodiment, Vertical side view of the mounting portion of the return operating body of the embodiment Vertical side view of the mounting portion of the return operating body of the embodiment Vertical side view of the mounting portion of the return operating body of the embodiment Exploded perspective view showing the configuration of the mounting portion of the return operating body A longitudinal side view of the mounting portion of the shutoff valve of the second embodiment, Vertical side view of the mounting portion of the return operating body of the embodiment Vertical side view of the mounting portion of the return operating body of the embodiment Vertical side view of the mounting portion of the return operating body of the embodiment Exploded perspective view showing the configuration of the mounting portion of the return operating body

[First Embodiment]
Hereinafter, the gas meter of a 1st embodiment of the present invention is explained based on a drawing.
As shown in FIG. 1, a metering unit 2 is provided in a casing 1 that can be divided vertically, and an inlet that defines an inlet-side channel portion G <b> 1 that spans the inlet unit 3 and the metering unit 2 in the gas channel G is formed. The casing 1 is equipped with a channel-forming member 4 on the side and an outlet-side channel-forming member 6 that partitions and forms an outlet-side channel portion G2 extending between the measuring section 2 and the outlet section 5. Moreover, the measurement part 2 is comprised by the internal flow type which flows and measures gas to be measured through the inside.
That is, the gas meter of the first embodiment is configured such that the gas flowing in from the inlet portion 3 flows to the outlet portion 5 through the gas flow path G defined in the casing 1. The gas does not flow in the space corresponding to the outside of the flow path forming member 4 on the inlet side, the measuring section 2 and the flow path forming member 6 on the outlet side.

The metering unit 2 of this embodiment includes a metering main body 2A, an inlet-side manifold 2B that guides the gas from the inlet-side channel part G1 to the metering main-body 2A, and the gas from the metering main-body 2A. It is comprised from the exit side manifold part 2C led to the part G2.
The measurement main body 2A is configured using, for example, an ultrasonic flow meter.

As shown in FIG. 2, a shutoff valve V that closes the gas flow path G formed in the casing 1 by closing when an abnormality occurs is provided in the flow path forming member 4 on the inlet side.
The shut-off valve V is energized to return to the closed state and is held in the open state by the electromagnetic holding unit 7. The control unit (not shown) controls the energization of the electromagnetic holding unit 7. However, based on the measurement information of the measuring unit 2, the gas flow rate flowing through the gas flow path G becomes abnormally excessive, or the time for the gas to continue flowing through the gas flow path G becomes abnormally long. When it is determined that an abnormality has occurred, the energization of the electromagnetic holding unit 7 is stopped, and the shutoff valve V is closed.

The shut-off valve V is closed when the valve body 8 contacts the valve seat 9 formed in the flow path forming member 4 on the inlet side, and is opened when the valve body 8 is separated from the valve seat 9. It is configured.
The valve operating shaft 10 as a valve operating portion for operating the shut-off valve V in the closed state to the valve opening side is connected to the valve body 8 and protrudes through the inlet side flow path forming member 4. Is provided.
Although not described in detail, the penetrating portion of the valve operating shaft 10 in the flow path forming member 4 on the inlet side is equipped with a sealing material to suppress gas leakage.

In order to return the shutoff valve V, which has been operated to the closed state as described above, from the closed state to the open state, it is necessary to return the shutoff valve V from the closed state to the open state. It is necessary to move the valve operating shaft 10 to the valve opening side of the shutoff valve V with the opening operation moving amount.
For this reason, return operation means U for moving the valve operating shaft 10 to the valve opening side of the shutoff valve V is provided, and the return operation means U will be described below.

  As shown in FIGS. 2 to 5, the shaft-like return operating body 11 for operating the valve operating shaft 10 to the valve opening side and returning the shut-off valve V to the valve open state moves inward and outward of the casing 1. The valve operating shaft 10 is moved from the standby position toward the inside of the casing 1 in a state where it is freely urged to return to the standby position in which one end side portion protrudes outward from the casing 1. It is provided in a state of operating on the valve opening side.

  Specifically, as the return operation body 11 is moved by a unit amount toward the inside of the casing 1, the valve operation shaft 10 is moved to the valve opening side of the shutoff valve V with a movement amount larger than the unit amount. The movement amount expansion linkage mechanism K to be moved is provided in a space corresponding to the outside of the flow path forming member 4 on the inlet side, the metering portion 2 and the flow path forming member 6 on the outlet side in the casing 1, and is returned. When the operating body 11 is moved inward of the casing 1, the valve operating shaft 10 is configured to be moved to the valve opening side by the movement amount expansion linkage mechanism K.

When the explanation is added, the support member 13 is connected to the outer surface of the inlet-side flow path forming member 4 by the operated member 12 as the operated portion that is pressed and moved at the end in the casing 1 of the return operating body 11. Further, it is supported so as to be movable along an axial direction parallel to the axial direction of the valve operating shaft 10.
Further, a large-diameter pinion portion 14A that engages with the rack portion 10a formed on the valve operating shaft 10 and a small-diameter pinion portion 14B that engages with the rack portion 12a formed on the operated body 12 rotate integrally. The linkage pinion 14 prepared for the state is provided in a state of being rotatably supported by the support member 13 described above, and the movement amount expansion linkage mechanism K is operated by the linkage pinion 14 and the operated object 12 and the valve operating shaft 10. It is comprised as a means to link.
Incidentally, in this embodiment, the linkage pinion 14 is formed so that when the operated body 12 moves by a unit amount, the valve operating shaft 10 moves by a double movement amount.

  Therefore, when the shutoff valve V is in the closed state, as shown in FIGS. 3 and 4, the return operating body 11 located at the standby position urged to return to the outer side of the casing 1 is shown in FIG. As shown in FIG. 5, the object 12 is pushed and moved by the return operation body 11 by pushing and moving inward of the casing 1, and the linkage pinion 14 is moved along with the movement of the object 12. By moving the operating shaft 10 to the open state side of the shutoff valve V, the shutoff valve V is returned to the open state.

  Then, since the movement amount of the valve operating shaft 10 is greatly increased by the movement amount expansion linkage mechanism K than the unit movement amount of the return operation body 11, the return operation body 11 is moved from the standby position to the casing 1. Even if the amount moved inward is smaller than the opening operation moving amount of the valve operating shaft 10, the shutoff valve V can be returned to the open state, and as a result, as shown in FIGS. In a state where the return operation body 11 is positioned at the standby position where the return operation body 11 is biased to the outside of the casing 1, the amount of protrusion of the return operation body 11 protruding outward from the casing 1 can be reduced.

Moreover, as shown in FIGS. 2-4, the valve opening / closing state display means H for enabling the monitoring of the opening / closing state of the shut-off valve V from the outside of the casing 1 is provided.
That is, the outer periphery of the one end side portion located outside the casing 1 in the return operating body 11 is configured as a valve opening state display portion 11A for displaying that the shutoff valve V is in the valve open state. The cylindrical body 15 covering the operating body 11 is movable back and forth in the casing 1 and is urged to return to the valve closing state display position that covers the valve opening state display portion 11A of the operating body 11 for returning to the standby position. It is provided in the state.

The outer periphery of the one end side part located outside the casing 1 in the cylindrical body 15 located at the valve closing state display position is a valve closing state display unit 15A for displaying that the shutoff valve V is in the valve closing state. When the shutoff valve V is in the open state, the cylindrical body 15 is locked and held at the retracted position where it is moved inward of the casing 1, and when the shutoff valve V is in the closed state, the latching and holding action is performed. Locking holding means J for releasing is provided.
Incidentally, the bottomed cylindrical cover body 16 formed of a transparent resin material is bonded to the end of the return operation body 11 on the outer side of the casing so as to move integrally with the return operation body 11. It is provided in a state of being fixed by an agent or the like.

  That is, in the open state of the shutoff valve V, as shown in FIG. 3, the cylindrical body 15 is held at the retracted position by the locking holding means J. The valve-opening state display part 11A located in the direction becomes visible, and the valve-opening state display part 11A can be confirmed from the outside of the casing 1 to confirm that the shutoff valve V is in the valve-opening state.

  Further, in the closed state of the shutoff valve V, since the latch holding action of the latch holding means J is released and the cylindrical body 15 has moved to the valve closed state display position, as shown in FIG. The valve opening state display part 11A of the return operating body 11 is covered with the cylindrical body 15, and the valve closing state display part 15A located outside the casing 1 in the cylindrical body 15 becomes visible, and this valve closing is performed. By visually checking the state display portion 15A from the outside of the casing 1, it can be confirmed that the shutoff valve V is in a closed state.

  Incidentally, in this embodiment, the valve opening state display part 11A in the return operating body 11 is colored green, and the valve closing state display part 15A in the cylindrical body 15 is colored red, Due to the change, the open / close state of the shutoff valve V can be easily seen.

  As shown in FIG. 3, the locking body J includes a locking body 18 that is engageable with the locked hole 17 of the cylindrical body 15 and is urged to return to the engagement side. The tubular body 15 is configured to be locked and held at the retracted position by engaging with the locked hole 17 when positioned at the retracted position, and as illustrated in FIG. The locking body 18 in the locked holding state engaged with 17 is pressed at the end of the valve operating shaft 10 as the shutoff valve V is closed to release the locking holding action. It is configured to switch to the release state.

Further, in order to return the shut-off valve V in the closed state to the open state, as shown in FIG. 5, when the return operating body 11 is moved inward of the casing 1, the cylindrical body 15 is covered. The body 16 is pressed to move inward of the casing 1 so that the locking body 18 is engaged with the locked hole 17.
Therefore, when the operation for moving the return operation body 11 to the inside of the casing 1 is finished and the return operation body 11 is returned to the retracted position, as shown in FIG. Will be held.

Hereinafter, the configuration of the mounting portion of the return operation body 11 and the cylindrical body 15 will be described.
That is, as shown also in FIG. 6, the main frame 19 having a double cylindrical shape and having a bottom connected thereto, and a bottomed cylindrical sub frame 20 connected to the bottom of the main frame 19 in a fitted state. Is provided.
The sub-body frame 20 is formed in a state including a large-diameter opening side portion 20a and a small-diameter bottom side portion 20b along the longitudinal direction, and the large-diameter opening side portion 20a is formed of the main frame as described above. 19 is connected in a state of being fitted to the bottom.

The main body frame 19 is arranged in a state of penetrating the mounting hole E formed in the casing 1, and screw portions 19 a are formed at positions on the outer peripheral portion of the main body frame 19 on the inner side and the outer side of the casing 1. Has been.
And the inner side fixing body 21 screwed by the inner side part of the casing 1 of the main body frame 19 and the outer side fixing body screwed by the outer side part of the casing 1 of the main body frame 19 22, and the inner side fixing body 21 and the outer side fixing body are arranged so that the casing 1 is sandwiched between the inner side fixing body 21 and the outer side fixing body 22. The main frame 19 and the sub-frame 20 connected to the main frame 19 can be fastened to the casing 1 by fastening to the casing 22.

A flange-like portion 16a is formed at an end portion on the inner side of the casing of the cover body 16 fixed to the end portion on the outer side of the casing of the return operation body 11, and the flange-like portion 16a is formed on the outer side. By contacting the fastening body 22, the standby position of the return operation body 11 that moves integrally with the cover body 16 is determined.
Incidentally, the return operating body 11 penetrates the bottom of the cylindrical body 15 and penetrates the bottom of the sub-body frame 20 so as to project to the existence side of the shutoff valve V. As described above, the end portion of the touch panel moves the object 12 to be operated.

The cover body 16 is inserted between the inner and outer cylinder portions of the double-cylindrical main frame 19 and is externally fitted to the inner cylinder portion of the inner and outer cylinder portions so as to be movable in the casing inner and outer directions. As described above, the cover body 16 is supported by the main body frame 19 so as to be movable inward and outward of the casing, so that the return operating body 11 that moves integrally with the cover body 16 is attached to the main body frame 19. It is supported so as to be movable in and out of the casing.
A spring 23 that presses the flange-like portion 16a of the cover body 16 outwardly of the casing is disposed between the inner and outer cylinder portions of the double-cylindrical main frame 19, and the return operation is performed by the spring 23. The body 11 is urged to return to the standby position.

The cylindrical body 15 is fitted into the inner cylindrical portion of the main body frame 19 and the small-diameter bottom side portion 20 b of the sub-body frame 20 so as to be movable in the inner and outer directions of the casing 1.
In addition, a spring 24 that presses the cylindrical body 15 outward from the casing is disposed inside a small-diameter bottom side portion 20b of the sub-body frame 20, and the cylindrical body 15 is moved to a standby position by the spring 24. The return operating body 11 is urged to return to the valve closing state display position that covers the valve opening state display portion 11A.

A locking projection 15 a is formed on the outer peripheral portion of the cylindrical body 15, and the locking projection 15 a is an inner surface of the inner cylindrical portion of the inner and outer cylindrical portions of the main frame 19. Further, it is configured to engage with a fitting groove D formed along the inner and outer directions of the casing so as to be movable in the inner and outer directions of the casing and prevent the rotation of the cylindrical body 15.
That is, the rotation of the cylindrical body 15 is performed so that the rotation phase of the cylindrical body 15 is a phase suitable for the locking body 18 to be engaged and disengaged with respect to the locked hole 17 formed in the cylindrical body 15. Checking is stopped.

The locking body 18 is pivotally supported by a support piece 25 provided inside the large-diameter opening side portion 20a of the sub-body frame 20 so as to swing and hold the cylindrical body 15 at the retracted position. It is configured to be switchable between a locking and holding posture and a releasing posture for releasing the locking and holding action, and is returned to the locking and holding posture by a torsion spring 26.
Further, one end of the locking body 18 that is pressed by the valve operating shaft 10 protrudes outward through an insertion hole 27 formed in the large-diameter opening side portion 20 a of the sub-body frame 20.

As described above, the return operation body 11 and the cylindrical body 15 and the members attached to them are mounted on the main frame 19 and the subframe 20 connected thereto.
Therefore, by attaching the main frame 19 to the casing 1 in a state of passing through the mounting hole E of the casing 1, the return operation body 11, the cylindrical body 15, and members attached thereto can be assembled to the casing 1. It has become.

[Second Embodiment]
Next, a gas meter according to a second embodiment of the present invention will be described with reference to the drawings. The same components as those in the first embodiment described above are the same as those in the first embodiment in order to omit redundant description. Reference numerals are assigned and explanations thereof are omitted.

  As shown in FIG. 7, the gas meter according to the second embodiment is provided with a membrane-type measuring unit (not shown) inside the casing 1, and has an inlet-side channel portion in the gas channel G. The flow path forming member 4 on the inlet side that forms G1 is configured to flow gas toward the inner space of the casing 1. That is, in this gas meter, the inner space of the casing 1 is filled with gas.

Therefore, when the main frame 19 and the sub-frame 20 connected thereto are fixed to the casing 1 in a state of passing through the mounting hole E of the casing 1, the main frame 19 and the sub-body frame 20 are mounted to the casing 1 in a state having a sealing property. .
That is, as shown in FIGS. 8 to 11, the annular frame 28 is attached to the end of the main body frame 19 on the casing outer side by welding.
By providing the annular frame 28 in this way, the outer side fixing body 22 described in the first embodiment is omitted in the second embodiment, and this second embodiment In the form, the length of the outer cylinder part of the inner and outer cylinder parts of the main frame 19 is shorter than that of the first embodiment.

  Then, by tightening the inner side fastening body 21 so that the casing 1 is sandwiched between the annular frame 28 and the inner side fastening body 21, the main frame 19 and the sub-frame connected thereto. The body frame 20 is attached to the casing 1 in a state of passing through the attachment hole E of the casing 1.

An annular elastic seal body 29 as a gas leakage prevention seal body is provided on the outer side of the main frame 19 in the casing-side end surface of the annular frame 28. The elastic seal body 29 is a casing. By being applied to the outer surface of 1, the space between the outer side of the main frame 19 and the outer surface of the casing 1 in the casing-side end surface of the annular frame 28 is sealed.
That is, the gas existing in the casing is prevented from flowing out of the casing 1 through the outer side of the main frame 19.

A cover body 16 connected to an end of the return operation body 11 on the outer side of the casing is arranged so as to move inward and outward of the casing 1 while being fitted in the annular frame 28.
An annular elastic seal body 30 as a gas leakage prevention seal body is provided on the inner surface of the annular frame 28, and the elastic seal body 29 is applied to the outer surface of the cover body 16. The inner surface and the outer surface of the cover body 16 are configured to be sealed.

  In other words, the gas present in the casing flows into the inside of the sub-body frame 20 through the through-hole of the return operating body 11 in the sub-body frame 20, so that the gas existing in the casing becomes inside and outside of the main body frame 19. The gas flowing in this way is prevented from flowing out of the casing 1 through the space between the inner surface of the annular body 28 and the outer surface of the cover body 16. It is like that.

[Another embodiment]
In the first and second embodiments, the case where the movement amount expansion linkage mechanism is configured by a linkage pinion provided in a state of integrally rotating a large-diameter pinion portion and a small-diameter pinion portion, Various configurations can be applied as the movement amount expansion linkage mechanism.
That is, for example, a pair of links having different lengths are fixed to the rotating shaft, and the tip of the short link is covered by the tip of the long link as the tip of the short link is pressed and swung by the return operating body. Various types of movement amount expansion linkage mechanisms can be configured, such as configuring a link mechanism for moving the operation unit.

DESCRIPTION OF SYMBOLS 1 Casing 2 Metering part 3 Inlet part 4 Inlet side flow path formation member 5 Outlet part 6 Outlet side flow path forming member 10 Valve operation part 11 Return operation body 14 Linking pinion 14A Large diameter pinion part 14B Small diameter pinion part G Gas flow path G1 Inlet side flow path part G2 Outlet side flow path part K Travel amount expansion linkage mechanism V Shut-off valve

Claims (3)

When the abnormality occurs, a shut-off valve that shuts off the gas flow path formed in the casing by operating the valve and a valve operating unit that operates the shut-off valve in the closed state to the valve opening side are operated to the valve opening side, A shaft-shaped return operating body for returning the shutoff valve to a valve open state;
The return operating body is movable to the inside and outside of the casing and is urged to return to a standby position in which one end portion protrudes outward from the casing, and from the standby position to the casing. A gas meter provided in a state of operating the valve operating part to the valve opening side by being moved inward,
As the return operating body is moved by a unit amount toward the inside of the casing, the movement amount is increased by moving the valve operating portion toward the valve opening side of the shut-off valve by a movement amount larger than the unit amount. A gas meter in which a linkage mechanism is provided in the casing. An inlet-side flow channel forming member that partitions and forms an inlet-side flow channel portion that extends between the inlet portion and the metering portion in the gas flow channel, and an outlet-side flow channel portion that extends between the metering portion and the outlet portion. An outlet-side flow path forming member is provided in the casing,
The metering unit is configured to meter gas by flowing through the inside;
The movement amount expansion linkage mechanism is provided in a space corresponding to the outside of the inlet side flow path forming member, the metering portion, and the outlet side flow path forming member in the casing. Gas meter.   The movement amount expansion linkage mechanism opens with the rotation of the small-diameter pinion portion rotated by the movement of the return operation body inward of the casing, and the valve operation portion. The gas meter according to claim 1, wherein the gas meter is constituted by a linkage pinion provided with a large-diameter pinion portion moved to the valve side in an integral rotation state.

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