JP6436642B2 - Membrane gas meter and manufacturing method thereof - Google Patents

Description

In the present invention, the blade shaft is rotated by the reciprocating motion of the measuring film in the measuring chamber, and the crank mechanism is rotated via the large elbow and the small elbow by the rotational motion of the blade shaft, and is attached to the crank mechanism. based on the flow rate of the gas pulse signal output from the MR sensor provided so as to face the flow outgoing magnet relates to that membrane type gas meter and a manufacturing method thereof measured.

In the case of a conventional permanent magnet and a membrane gas meter, as shown in FIG. 12, a permanent magnet 23 is attached to the upper surface of the small elbow 8 connected to the crank mechanism 9, and the MR sensor is placed within the movement range of the small elbow 8. The generated pulse is a system in which one pulse is transmitted every time the small elbow 8 (measuring film) makes one round trip.
For this reason, since the movement range of the measuring membrane at a small flow rate becomes small, it takes time to measure one pulse, and if the flow rate stops before sending one pulse, the measured value up to that time is not measured. Inconvenience occurs.

  In addition, in the case of a conventional gas meter with an MR sensor, the position and direction of the MR sensor and the flow-transmitting magnet are fixed at a fixed position in the gas meter. When the device is present, it is necessary to change the position and orientation of the gas meter, which increases the labor and cost.

JP 2010-025702 A

An object of the present invention is to reduce the labor and cost when changing a rotation detection type membrane gas meter to a rotation detection type membrane gas meter , or when newly manufacturing a rotation detection type membrane gas meter. In addition, it is possible to improve the measurement accuracy at low flow rates by sending a plurality of flow rate transmission pulse numbers during the measurement film-outward path, and there was a noise generating device near the place where the gas meter was installed In some cases, a membrane gas meter using an MR sensor that can easily avoid the influence of this noise is provided.

In order to achieve the above object, the invention according to claim 1 connects a measuring membrane for partitioning a measuring chamber through which a gas passes, a valve for opening and closing an inlet / outlet of the measuring chamber, the measuring membrane and the valve, a motion conversion mechanism for converting the reciprocating movement of the metering layer in accordance with the flow rate of the gas after converting the rotary motion into a reciprocating motion of the valve, is fixed on the rotation axis of the rotating part which communicates motion to the motion converting mechanism that a magnet is disposed at a position opposite to the rotating component, and a MR sensor for detecting the amount of rotation of the rotating component in response to magnetic change by the magnet, based on the rotation amount of the rotating component in membrane type gas meter that detects the flow rate of the gas Te, the rotating component which the magnet is fixed, the gear is connected to a crankshaft included in the motion conversion mechanism, be perpendicular to the axis of rotation of the crankshaft A gear connecting part having an axis of rotation, the MR sensor is a membrane-type gas meter that is included in the circuit which is disposed on the front side of the membrane type gas meter.
According to the present invention, the installation direction of the gas meter can be diversified.

The invention described in 請 Motomeko 2, the MR sensor, a magnetic surrounding said magnet surface facing the opposite surface, the periphery of the terms of the opposite side extending to the magnet side MR sensor The membrane gas meter according to claim 1, wherein a shield cover is attached.
According to the present invention, it is possible to prevent the MR sensor from malfunctioning due to noise generated from other devices.

According to a third aspect of the present invention, a measuring membrane for partitioning a measuring chamber through which gas passes and a valve for opening and closing the inlet / outlet of the measuring chamber are connected by a motion conversion mechanism, and the measuring membrane is reciprocated according to the gas flow rate. The motion is converted into a reciprocating motion of the valve after the motion converting mechanism converts it into a rotational motion, and a gas flow rate is measured based on the number of rotations of a reciprocating rotational component included in the motion converting mechanism. A membrane gas meter manufacturing method for manufacturing a rotation detection type membrane gas meter by exchanging parts of a motion detection type membrane gas meter, which is included in the motion conversion mechanism of the rotation detection type membrane gas meter or rotating parts in conjunction, the magnet is replaced with the rotating component with a magnet which is fixed on the rotation axis of the rotating component, place the MR sensor to the rotating component and a position opposed to the MR sensor A membrane-type gas meter manufacturing method for manufacturing the rotation detecting membrane-type gas meter that detects the flow rate of the gas based on the rotation amount of the rotating component in response to magnetism change in output.
According to a fourth aspect of the present invention, a crankshaft as the rotating part included in the motion conversion mechanism of the rotation detection type membrane gas meter is replaced with the crankshaft with the magnet, and the rotation detection type. The membrane gas meter manufacturing method according to claim 3 , wherein the membrane gas meter is manufactured.
According to a fifth aspect of the present invention, there is provided a gear coupling that is a rotating component that is gear-coupled to a crankshaft included in the motion conversion mechanism of the rotation detection type membrane gas meter and has a rotating shaft that is orthogonal to the crankshaft. The membrane gas meter manufacturing method according to claim 3 , wherein the rotation detection type membrane gas meter is manufactured by exchanging a component with the gear coupling component with the magnet.

According to the present invention, it is possible to reduce the labor and cost of work when remodeling to a rotation detection type membrane gas meter or when newly manufacturing it.

In addition, by preparing two types of gas meters with different magnet orientations, if there is a risk of malfunction due to the influence of magnetic noise transmitted from other equipment at the installation location of the gas meter, A type that can avoid this noise during installation can be selected.

In addition, by attaching a magnetic shield cover to the MR sensor, it is possible to avoid the influence of magnetic noise emitted from other devices.

In addition, in the case of gas meters used by city gas customers, it is legally required to renew them every 10 years, and replacement and inspection of gas meters that have been raised in such renewal work In this case, it is possible to reduce the labor and work cost when changing the rotation detection type membrane gas meter to the rotation detection type membrane gas meter .

In the membrane gas meter according to the present invention, an explanatory view of the state where the upper case is removed Explanatory drawing of crank mechanism with permanent magnet attached Illustration of permanent magnet, crank mechanism and small elbow Explanatory drawing which shows the internal structure of the membrane gas meter which concerns on this invention Exploded view of crank base support shaft, crank base, crank shaft and snap ring clip mechanism Illustration of crank mechanism and MR sensor (A) (B) Explanatory drawing of Example 3 which attached the magnetic shielding board to MR sensor. Sectional drawing of the gas meter of Example 2 which attached MR sensor to the front side of a gas meter using a worm mechanism Plan view of the worm mechanism of FIG. Explanatory drawing of machine room and crank mechanism of conventional membrane gas meter Explanatory drawing of conventional crank mechanism Illustration of a conventional electronic gas meter with a flow transmitter magnet attached to a small elbow

The first embodiment corresponds to the first aspect of the present invention, and will be described in detail with reference to FIGS.

Reference numeral 1 denotes a gas meter main body, and the gas meter main body 1 rotates the blade shaft 5 rotating at a predetermined angle by reciprocating movement of the measuring film 4 in the measuring chamber 3 formed in the lower case 2. 6 is transmitted to the crank mechanism 9 via the large elbow 7 and the small elbow 8 in the inner ring 6, and the rotational movement of the crank mechanism 9 is transmitted to the valves 11 and 12 of the measuring chamber 3 to enter and exit the measuring chamber 3. Control the gas.
As shown in FIGS. 2 and 3, the crank mechanism 9 includes a lower crank plate 9a, a pin 9b, an upper crank plate 9c and an elbow engaging pin 9d attached to the crankshaft 20. It is the same as the crank mechanism.

In FIG. 4, the upper case 6 is partitioned into an upper chamber 14 and a lower chamber 15 by a partition plate 13, and a crank base receiving shaft 16 projects from the lower case 2 side in the lower chamber 15. The lower end 18 of the crank base 17 is fitted into the upper opening 19 of the crank base receiving shaft 16, and the crank base 17 is fixed to the bottom plate 33 with screws 32.

  The crank base 17 is formed with a crankshaft hole 21, and the crank mechanism 9 has a snap fit ring in which the crankshaft 20 is engaged with a convex ring 18a and a concave ring groove 20a as shown in FIG. It is attached so as to be engaged at the lower end portion of the crank base 17 in a manner.

At the uppermost stage of the crank mechanism 9, a mounting plate 22 having a flow rate transmission magnet 23 attached to the upper surface so as to rotate coaxially with the crankshaft 20 is attached. An MR sensor 24 that outputs a flow rate pulse signal is installed at a position opposite to 23.

  This flow rate is calculated by the flow rate calculation circuit 26 based on the number of pulses output from the MR sensor 24 and displayed on the liquid crystal screen 27.

  According to the above embodiment, when the mechanical counter type gas meter is changed (improved) to the MR sensor type by improving the mounting plate 22 having the flow rate transmission magnet 23 attached to the upper surface so as to be attached to the upper stage of the crank mechanism 9, The crank mechanism 9 having the flow rate transmission magnet 23 attached to the crank mechanism 9 can be easily changed to an MR type gas meter by simply replacing the crank mechanism 9.

  Further, in a conventional electronic gas meter that outputs one pulse by one reciprocation of the metering membrane, a flow rate transmitting magnet 23 that rotates coaxially with the crankshaft 20 and an MR sensor 24 that outputs a plurality of pulses by one rotation of the flow rate transmitting magnet 23. Thus, for example, 8 pulses can be output while the measuring film 4 reciprocates once, and thereby the measuring accuracy can be increased by 8 times.

  In this embodiment, the flow transmitter magnet 23 is directed in the front direction in the gas meter main body 1 as shown in FIG. 8, and the MR sensor 24 is also opposed to the front flow transmitter 23 in the upper chamber 14. This is an embodiment corresponding to the invention as set forth in claim 2.

The second embodiment will be described in detail with reference to FIGS. 8 and 9. A worm 28 is attached to the crankshaft 20, and a worm wheel 29 meshing with the worm 28 is attached to a horizontal worm rotary shaft 30. The flow rate transmission magnet 23 is attached to the front end of the gas sensor, and the MR sensor 24 is provided on the upper chamber 14 side so as to face the flow rate transmission magnet 23. The gas meter of the second embodiment is the same as that of the first embodiment. When the flow-transmitting magnet 23 is directed upward as in a gas meter, it can be used to avoid this when it is affected by magnetism from other equipment.

In the gas meter described above, the crank mechanism 9 can be pulled out of the crank base 17 together with the crankshaft 20 and removed, and can be reassembled by a snap fit ring system.

In the third embodiment, a claw 25a is provided on the lower surface of the battery holder as shown in FIGS. 6, 7A and 7B so that the MR sensor 24 is not affected by noise. This is an embodiment corresponding to the invention according to claim 3 in which the magnetic shield cover 25 attached so as to cover the upper surface of the MR sensor 24 is attached by positioning using snap fit.

  Reference numeral 26 in the figure denotes a flow rate calculation electronic circuit, 27 denotes a liquid crystal display panel, 31 denotes a worm case, 32 denotes a fixing screw, and 34 in FIG. 9 denotes a reset button.

  In the membrane gas meter of the present invention, the reciprocating motion of the measuring membrane 4 generated by the gas flow is transmitted from the blade shaft 5 to the crank mechanism 9 via the large elbow 7 and the small elbow 8, and the crank mechanism 9 The crank motion is performed, and the flow rate transmitting magnet 23 is rotated coaxially with the crankshaft 20 by the mounting plate 22 in the upper stage.

  In this way, when the flow rate transmitting magnet 23 rotates once, a plurality of pulse signals are output from the MR sensor 24, and the flow rate corresponding to the number of pulses is calculated by the electronic circuit 26 and displayed on the liquid crystal display panel 27.

  Alternatively, in the case of automatic meter reading, a pulse signal is transmitted from the electronic circuit 26 to the calculation center.

1 Gas meter body 9 Crank mechanism 13 Partition plate 14 Upper chamber 15 Lower chamber 16 Crank base receiving shaft 17 Crank base 18 Lower end 20 Crank shaft 22 Mounting plate 23 Flow rate transmitting magnet 24 MR sensor 25 Magnetic shield cover 28 Warm 29 Warm wheel

Claims (5)

A metering membrane that partitions the metering chamber through which the gas passes;
A valve for opening and closing the entrance and exit of the weighing chamber;
A motion conversion mechanism that connects the metering membrane and the valve, converts a reciprocating motion of the metering membrane according to a gas flow rate into a rotational motion, and then converts it into a reciprocating motion of the valve;
A magnet fixed on the rotation axis of the rotating part which communicates motion to the motion conversion mechanism,
An MR sensor disposed at a position facing the rotating component and detecting the amount of rotation of the rotating component in accordance with a change in magnetism by the magnet;
In the membrane gas meter that detects the gas flow rate based on the rotation amount of the rotating component ,
The rotating component to which the magnet is fixed is a gear connecting component that is gear-connected to a crankshaft included in the motion conversion mechanism and has a rotating shaft that is orthogonal to the rotating shaft of the crankshaft.
The MR sensor is a membrane gas meter included in a circuit arranged on the front side of the membrane gas meter. 2. The MR sensor is provided with a surface opposite to the surface facing the magnet and a magnetic shield cover extending from the opposite surface toward the magnet and surrounding the MR sensor. A membrane gas meter according to 1. A measuring membrane that partitions the measuring chamber through which the gas passes and a valve that opens and closes the inlet / outlet of the measuring chamber are connected by a motion conversion mechanism, and the motion conversion mechanism rotates the reciprocating motion of the measuring membrane according to the gas flow rate. A part of a rotation detection type membrane gas meter that converts the movement into a reciprocating movement of the valve and measures the flow rate of the gas based on the number of rotations of the reciprocating rotating part included in the movement conversion mechanism. Is a method of manufacturing a membrane gas meter for manufacturing a rotation detection type membrane gas meter,
The rotating component included in or interlocked with the motion conversion mechanism of the rotation detection type membrane gas meter is replaced with the rotating component with a magnet having a magnet fixed on the rotating shaft of the rotating component. Manufactures the rotation detection type membrane gas meter in which an MR sensor is arranged at a position facing the rotating component and the flow rate of the gas is detected based on the amount of rotation of the rotating component according to the change in magnetism detected by the MR sensor. To manufacture a membrane gas meter. The rotation detection type membrane gas meter is manufactured by replacing a crankshaft as the rotating component included in the motion conversion mechanism of the rotation detection type membrane gas meter with the crankshaft with the magnet. 4. A method for producing a membrane gas meter according to 3. The gear-connected component, which is a rotating component having a rotation axis orthogonal to the crankshaft, is gear-connected to a crankshaft included in the motion conversion mechanism of the rotation detection type membrane gas meter. 4. The method of manufacturing a membrane gas meter according to claim 3, wherein the rotation detection type membrane gas meter is manufactured by exchanging with a connecting part.

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