JP2010066105A - Membrane type gas meter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the number of components, to save on a space inside a gas meter, and to downsize the gas meter by simplifying the structure of a rotary valve for adjusting gas flow and that of a horizontal shaft for driving a number wheel of a counter. <P>SOLUTION: The membrane type gas meter is equipped with: a metering chamber divided by a metering diaphragm reciprocating back and forth; a link mechanism for converting the reciprocating operation of the metering diaphragm to rotary operation; and the rotary valve 20 rotated by a link mechanism. The rotation of the rotary valve 20 switches introduction of gas to the metering chamber. Also, the membrane type gas meter is provided with: a horizontal shaft 10 rotating with a horizontal direction as an axis; a counter section for transmitting the rotation of the horizontal shaft 10 for displaying the integral value of gas; and a rotation operation conversion means for converting the rotary operation of the rotary valve 20 to that of the horizontal shaft 10. In one example of the rotary operation conversion means, a crown gear shape section 21 is provided in the rotary valve 20, and a pinion 11 is provided in the horizontal shaft 10. Then, they are engaged to convert the rotary operation of the rotary valve 20 to that of the horizontal shaft 10. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a membrane gas meter, and more particularly to a membrane gas meter having a mechanism for converting a reciprocating motion of a membrane in a measurement chamber into a rotational motion of a rotary valve.

  A membrane gas meter is generally used as a gas meter for small and medium flow rates for city gas. The membrane gas meter is designed to discharge the gas on both sides of the metering membrane alternately out of the main body case by the reciprocating motion of the metering membrane built in the two metering chambers inside the main body case. It is converted into a rotational operation using a mechanism, and has a structure in which a valve is driven to distribute gas, and a number wheel of a counter unit is driven to display an integrated flow rate.

  4 is a partially broken front view showing a membrane gas meter, and FIG. 5 is a side sectional view of the same. The casing of the membrane gas meter has a main body case constituting the lower part and an upper case constituting the upper part, and a gas inlet 7 and a gas outlet 8 are provided in the upper case. The lower space provided inside the main body case and the upper space provided inside the upper case are partitioned by a partition wall, and the lower space is partitioned into a front weighing chamber 1a and a rear weighing chamber 1b. ing.

  Each of the front weighing chamber 1a and the rear weighing chamber 1b is provided with a weighing membrane 9, and each weighing chamber 1a, 1b is divided by the weighing membrane 9 to form a weighing chamber. That is, as shown in FIG. 5, the first measuring chamber (a) and (b) are formed in the front measuring chamber 1a by the measuring film 9, and the third measuring chamber (b) is formed in the rear measuring chamber 1b by the measuring film 9. And the 4th measurement chambers (c) and (d) are formed. The reciprocating motion of each measuring membrane 9 is transmitted to the blade 3 through the membrane plate 4 attached to both surfaces of the measuring membrane 9, and the swing of the blade 3 is transmitted to the blade shaft 2 and the link mechanism 6, The rotary shaft 31 in the vertical direction rotates. The rotation valve (valve) 20 is rotationally driven by this rotation. Further, the rotation operation by the vertical rotation shaft 31 is converted into the rotation operation of the horizontal rotation shaft provided with the screw gear portion 33, and by this rotation operation in the horizontal direction, the number wheel 32 of the counter unit rotates and the flow rate is changed. Accumulated display is performed.

  FIG. 6 is a perspective view showing a configuration example of the measuring unit main body of the gas meter. The gas that has flowed into the gas meter from the gas inlet 7 shown in FIG. 4 passes through the opening of the rotary valve 20 that rotates together with the rotary shaft 31 and flows into the measuring chamber inside the measuring unit body. As described above, the measuring chamber is composed of four chambers partitioned by the two measuring membranes 9 and flows into one of the measuring chambers determined by the position of the opening of the rotary valve 20 that rotates together with the rotating shaft 31. The gas thus moved translates (reciprocates) the metering membrane 9 with the pressure. The reciprocating motion of the measuring film 9 is transmitted to the blade shaft 2 and further transmitted to the link mechanism 6. The link mechanism 6 converts the reciprocating motion of the measuring film 9 into a rotational motion to rotate the rotating shaft 31. The rotation of the rotation shaft 31 is converted into rotation of the horizontal axis by the action of the screw gear portion 24, and the rotation operation is transmitted to the number wheel of the counter portion. As a result, the counter unit displays the flow rate integrated according to the rotational speed of the horizontal axis.

FIG. 7 is a diagram schematically showing a connecting portion between the horizontal axis and the number wheel of the counter unit. The counter unit includes a number wheel 32 for displaying the integrated amount of gas flow, and a counter case 37 for housing the number wheel 32. The counter case 37 is attached to the wall portion 40 of the weighing unit case, and is provided with a transparent display window 38 for allowing the number wheel 32 to be visually recognized from the outside. The horizontal shaft 35 transmits the rotation in the horizontal axis direction converted by the screw gear portion 33 shown in FIGS. 4 to 6, and the counter case 37 is passed through the through hole 41 of the measuring unit case from the inside of the measuring unit case. Extends inside. A packing 39 is disposed in a portion between the wall portion of the through hole 41 and the horizontal shaft 35.
A worm gear 36 is provided at the end of the horizontal shaft 35 to which the rotation operation based on the reciprocating operation of the measuring film 9 is transmitted. The worm gear 36 is engaged with the tooth gear 32a of the rotation shaft of the number wheel 32, Thereby, the rotation operation of the horizontal shaft 35 is transmitted to the number wheel.

With regard to a gas meter provided with a mechanism for transmitting the rotation operation of such a link mechanism to a counter, for example, Patent Document 1 provides an upper projecting end of an output shaft that transmits the rotational movement of a link lever to the input side of the counter. The output gear is meshed horizontally with the first-stage input gears of the plurality of gear groups, and the last-stage gears of the plurality of gear groups are meshed orthogonally with the input gears arranged on the side of the counter, thereby A configuration is disclosed in which the rotational motion is linked to the input end of the counter.
Japanese Utility Model Publication No. 7-043989

As described above, in the conventional gas meter, the rotation operation of the link mechanism 6 based on the reciprocating operation of the metering membrane 9 is transmitted to the rotary valve 20 via the rotary shaft 31 in the vertical direction, and the rotary valve 20 is rotated. The rotating operation of the rotating shaft 31 is transmitted to the horizontal shaft through the screw gear portion 33, and the number wheel 32 of the counter portion is rotated. In this way, a mechanism for rotating the rotary valve 20 by the rotation of the link mechanism 6 and a mechanism for transmitting to the horizontal axis by the screw gear portion 33 and the like are individually provided, and the number of parts is increased and the inside of the gas meter is increased. Space saving and downsizing of the gas meter have also been a factor in alienating.
Further, although the configuration of Patent Document 1 simplifies the phase shift transmission to the counter, it does not relate to the shape of the rotary valve, which is a feature of the present invention.

  The present invention has been made in view of the above circumstances, and in a membrane gas meter having a mechanism for converting the reciprocating motion of the metering membrane in the metering chamber into the rotational motion of the rotary valve, the rotation of the rotary valve is horizontal. Provided with a mechanism for transmitting to a membrane gas meter, the structure of the rotary valve and the horizontal shaft is simplified, the number of parts is reduced, the space inside the gas meter is reduced, and the gas meter is reduced in size. It is for the purpose.

  In order to solve the above-mentioned problems, the invention of claim 1 includes a measuring chamber partitioned by a measuring film that reciprocates back and forth, a link mechanism that converts the reciprocating operation of the measuring film into a rotating operation, and the link mechanism. A membrane gas meter that switches the introduction of gas into the measuring chamber by the rotation of the rotary valve, the membrane gas meter comprising: a horizontal axis that rotates about a horizontal direction; and A counter unit that operates by rotation and displays an integrated value of gas, and a rotation operation conversion unit that converts the rotation operation of the rotary valve into the rotation operation of the horizontal axis are provided.

  According to a second aspect of the present invention, in the first aspect of the invention, the rotational motion conversion means includes a crown gear shape portion provided on the rotary valve and a pinion provided on the horizontal shaft, and the crown gear shape is provided. The rotation operation of the rotary valve is converted into the rotation operation of the horizontal axis by engaging the part and the pinion.

  According to a third aspect of the present invention, in the first aspect of the invention, the rotational motion conversion means includes a plurality of protrusions provided on the rotary valve in a circumferential arrangement, a gear provided on the horizontal shaft, And the rotation operation of the rotary valve is converted into the rotation operation of the horizontal axis by engaging the projection and the gear.

  According to a fourth aspect of the present invention, in the first aspect of the invention, the rotational motion converting means includes a planar shape portion provided on the rotary valve, and a friction wheel provided on the horizontal shaft. When the friction wheel comes into contact with the planar shape portion and the planar shape portion rotates, the friction wheel rotates due to friction with the planar shape portion, thereby converting the rotation operation of the rotary valve into the rotation operation of the horizontal axis. It is characterized by doing.

  According to the present invention, in the membrane gas meter having a mechanism for converting the reciprocating motion of the metering membrane in the metering chamber into the rotational motion of the rotary valve, the rotary valve is provided with a mechanism for transmitting the rotation of the rotary valve to the horizontal axis. It is possible to provide a membrane gas meter that simplifies the structure of the horizontal axis, reduces the number of parts, saves space inside the gas meter, and reduces the size of the gas meter.

  That is, according to the present invention, the structure of the rotary valve and the horizontal shaft is configured as described above, so that the rotary valve has a power transmission function in addition to the gas introduction switching function, and switches the direction of rotation. There is no need to provide a separate configuration such as a screw gear. With such a configuration, the efficiency of the internal space of the membrane gas meter can be improved, and the membrane gas meter can be reduced in size. Furthermore, by sharing the functions of the members, the number of parts can be reduced, contributing to cost reduction.

  In the embodiment according to the present invention, the rotation of the horizontal shaft 10 for operating the number wheel 32 of the counter unit is not transmitted from the vertical rotation shaft as described above, but is rotated by the link mechanism 6. It is obtained by the rotation of the valve 20. That is, in the embodiment according to the present invention, the rotation operation conversion means for converting the rotation operation of the rotary valve 20 into the rotation operation of the horizontal shaft 10 is provided. A specific embodiment of the rotational motion conversion means will be described below.

FIG. 1 is a diagram for explaining an embodiment of a gas meter according to the present invention, and schematically shows a configuration example of a rotary valve and a horizontal axis of the gas meter. In FIG. 1, 10 is a horizontal axis and 20 is a rotary valve. The horizontal shaft 10 transmits the rotation operation to the horizontal shaft 35 that drives the number wheel 32 of the counter unit shown in FIG. Further, the horizontal axes 10 and 35 may be arranged on the same axis. The same applies to the following embodiments.
Here, a crown gear shape portion 21 is provided on the upper part of the rotary valve 20, and the pinion 11 corresponding to this is disposed on the horizontal shaft 10. Thereby, the rotation operation of the horizontal shaft 10 can be directly taken out from the rotation operation of the rotary valve 20 without providing a separate gear transmission device.

FIG. 2 is a view for explaining another embodiment of the gas meter according to the present invention, and schematically shows a configuration example of a rotary valve and a horizontal axis of the gas meter.
In the present embodiment, protrusions 22 regularly arranged in a circumferential manner are provided on the upper portion of the rotary valve 20, and the gear portion 12 that is engaged and driven by the protrusions 22 is disposed on the horizontal shaft 10. The shape of the protrusion 22 is not particularly limited, but may be a conical shape with a top portion notched in the horizontal direction. In addition, it is good also as the cylindrical projection part 22. FIG.
With such a configuration, the rotation operation of the horizontal shaft 10 can be directly extracted from the rotation operation of the rotary valve 20 without providing a separate gear transmission device. Moreover, by setting it as the structure of this embodiment. An arrangement in which the rotary shaft of the rotary valve 20 and the rotary shaft of the horizontal shaft 10 are offset from each other is possible.

FIG. 3 is a view for explaining still another embodiment of the gas meter according to the present invention, and schematically shows a configuration example of a rotary valve and a horizontal axis of the gas meter.
In the present embodiment, the planar shape portion 23 is provided on the upper portion of the rotary valve 20, and the friction wheel 13 is provided on the horizontal shaft 10. And it arrange | positions so that the friction wheel 13 may contact the planar shape part 23, and it is comprised so that the friction wheel 13 of the horizontal shaft 10 may be rolled by frictional force according to rotation of the rotary valve 20, and the horizontal shaft 10 may be rotated. To do. Thereby, the rotation operation of the horizontal shaft 10 can be directly extracted from the rotation operation of the rotary valve 20. In addition, the configuration of the present embodiment makes it possible to finely adjust the position of the friction wheel 13 in the axial direction of the horizontal shaft 10 to adjust an error (instrument difference) between individual gas meter devices during mass production. Become.

  In the configuration of the above-described embodiment, the crown gear shape portion 21, the protrusion portion 22, or the planar shape portion 23 provided on the upper portion of the rotary valve 20 may be formed on a member of the rotary valve 20 or rotate. The main body of the valve 20 may be formed by a separate member and integrated.

  By adopting a configuration that can convert the rotation of the rotary valve 20 into the rotation of the horizontal shaft 10 as described above, the rotary valve 20 has a power transmission function in addition to the gas introduction switching function. There is no need to provide a separate configuration such as a screw gear for switching. Thereby, the efficiency of the space inside a gas meter can be aimed at and it can contribute to size reduction of a gas meter. Furthermore, by sharing the functions of the members, the number of parts can be reduced, contributing to cost reduction.

It is a figure for demonstrating one Embodiment of the gas meter by this invention. It is a figure for demonstrating other embodiment of the gas meter by this invention. It is a figure for demonstrating other embodiment of the gas meter by this invention. It is a partially broken front view which shows an example of the conventional film | membrane type gas meter. It is a sectional side view of the membrane gas meter of FIG. It is a perspective view which shows the structural example of the measurement part main body of a gas meter. It is a figure which shows typically the connection part of a horizontal axis and the number wheel of a counter part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a ... Front measuring chamber, 1b ... Rear measuring chamber, 2 ... Blade axis, 3 ... Wing, 4 ... Membrane plate, 6 ... Link mechanism, 7 ... Gas inlet, 8 ... Gas outlet, 9 ... Measuring membrane, 10 ... Horizontal 11 ... pinion, 12 ... gear part, 13 ... friction wheel, 20 ... rotary valve, 21 ... crown gear shape part, 22 ... projection part, 23 ... planar part, 24 ... screw gear part, 31 ... rotary shaft, 32 ... Number wheel, 32a ... Toothed gear, 33 ... Screw gear, 35 ... Horizontal shaft, 36 ... Worm gear, 37 ... Counter case, 38 ... Display window, 39 ... Packing, 40 ... Wall, 41 ... Through-hole.

Claims (4)

A measuring chamber partitioned by a measuring membrane that reciprocates back and forth; a link mechanism that converts the reciprocating motion of the measuring membrane into a rotating motion; and a rotary valve that is rotated by the link mechanism. In a membrane gas meter that switches the introduction of gas into the measuring chamber,
The membrane gas meter includes a horizontal axis that rotates about a horizontal direction, a counter unit that operates by rotating the horizontal axis and displays an integrated value of gas, and a rotating operation of the rotary valve that rotates the horizontal axis. A film-type gas meter comprising: a rotation operation converting means for converting into a gas.   2. The membrane gas meter according to claim 1, wherein the rotation operation converting means includes a crown gear shape portion provided on the rotary valve and a pinion provided on the horizontal shaft, and the crown gear shape portion and the A membrane gas meter characterized in that the rotation operation of the rotary valve is converted into the rotation operation of the horizontal axis by engaging with a pinion.   The membrane gas meter according to claim 1, wherein the rotational motion conversion means includes a plurality of protrusions provided on the rotary valve in a circumferential arrangement, and a gear provided on the horizontal shaft. The membrane gas meter is characterized in that the rotation operation of the rotary valve is converted into the rotation operation of the horizontal axis by engaging the projection and the gear.   2. The membrane gas meter according to claim 1, wherein the rotational motion converting means includes a planar shape portion provided on the rotary valve and a friction wheel provided on the horizontal shaft, When the friction wheel contacts and the planar shape portion rotates, the friction wheel rotates due to friction with the planar shape portion, thereby converting the rotation operation of the rotary valve into the rotation operation of the horizontal axis. A membrane gas meter.

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