JP2017191061A - Diaphragm type gas meter and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a diaphragm type gas meter which is a rotation detection type and is easily manufactured, and provide a method for manufacturing the same.SOLUTION: In a diaphragm type gas meter, a magnet holder 50 including a magnet 55 disposed on a rotation shaft of a support shaft part 41 is attached to a second connection shaft part 45 on the upper end part of a crank shaft 40. The magnet holder 50 is provided with a non-circular engaging hole 51 corresponding to a non-circular cross-sectional shape of the second connection shaft part 45.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a membrane gas meter in which a membrane and a crankshaft are connected by a lever, and a method for manufacturing the same.

  As this type of membrane gas meter, a magnet is attached to a small elbow as a lever, and a magnetic sensor is provided within the moving range of the magnet, and detects the gas flow rate based on the number of rotations of the small elbow. Those are known (for example, see Patent Document 1).

JP 2002-267518 A (paragraph [0015], FIG. 2 etc.)

  In recent years, instead of the rotation detection type membrane gas meter described above, a rotation detection type membrane gas meter has been demanded.

  An object of the present invention is to provide a membrane gas meter that is of a rotation detection type and that is easy to manufacture and a method for manufacturing the same.

  In order to achieve the above object, the invention of claim 1 has a connecting shaft portion at the upper end portion to which a lever connected to the membrane of the membrane gas meter is connected, and is rotatably supported by the meter case. A membrane gas meter having a crankshaft having a supporting shaft portion at a lower end portion, a magnet holder attached to an upper end portion of the connecting shaft portion and arranging a magnet on a rotating shaft of the supporting shaft portion, and the meter Of the case, fixed to the upper side of the ceiling wall facing the crankshaft from above and disposed on the rotating shaft of the support shaft portion, for detecting the amount of rotation of the crankshaft based on the change in magnetism by the magnet And the gas flow rate is calculated based on the amount of rotation of the crankshaft detected by the magnetic sensor. A calculation unit, wherein in a two-dimensional plane perpendicular to the center axis of the support shaft portion, a film type gas meter and a holder positioning portion for positioning said magnet holder two-dimensionally relative to the crankshaft.

  According to a second aspect of the present invention, the upper end portion of the connecting shaft portion forms a non-circular shaft portion having a non-circular cross section, and the holder positioning portion is formed on the non-circular shaft portion and the magnet holder. The membrane gas meter according to claim 1, further comprising a non-circular hole into which the circular shaft portion is fitted.

  According to a third aspect of the present invention, the turning support portion that supports the lower end portion of the connecting shaft portion of the crankshaft is a plane that is adjacent to the corner portion and parallel to the rotation center of the support shaft portion. 1 side surface and 2nd side surface are provided, The said holder positioning part is formed in the upper end part of the said connection shaft part, and the said magnet holder, The fitting hole which the upper end part of the said connection shaft part fits 2. The film type according to claim 1, comprising: the first side surface and the second side surface; and a two-surface contact portion formed on the magnet holder and in contact with the first side surface and the second side surface. It is a gas meter.

  According to a fourth aspect of the present invention, the holder positioning portion is provided in the magnet holder with two positioning holes provided in a turning support portion that supports a lower end portion of the connecting shaft portion of the crankshaft, The membrane gas meter according to claim 1, further comprising two positioning pins fitted into the two positioning holes.

  According to a fifth aspect of the present invention, in the membrane type according to any one of the first to fourth aspects, the magnet holder is provided integrally with an adjustment collar that is received in a connecting hole formed in the lever. It is a gas meter.

  According to a sixth aspect of the present invention, the magnet shaft and an adjustment collar that is received in a coupling hole formed in the lever are separately attached to the coupling shaft portion. The membrane gas meter according to claim 1.

  According to a seventh aspect of the present invention, the outer surface of the connecting shaft portion and the inner surface of the fitting hole formed on the magnet holder and fitted with the upper end portion of the connecting shaft portion are engaged with each other. The membrane gas meter according to any one of claims 1 to 6, wherein a joint groove and an engaging protrusion are formed.

  According to an eighth aspect of the present invention, the connecting shaft portion is provided with a screw hole that opens upward, and a fixing screw for preventing the magnet holder from coming off is attached to the screw hole. A membrane gas meter according to any one of claims 1 to 6.

  According to a ninth aspect of the present invention, a screw hole is provided in a side surface of the adjustment collar, and a fixing screw for fixing the magnet holder to the connecting shaft portion is attached to the screw hole. It is a film | membrane type gas meter of description.

  According to a tenth aspect of the present invention, the magnet holder includes a main plate with which the bottom surface of the magnet contacts, a contact wall that protrudes from the main plate and contacts the side surface of the magnet, and an adjustment screw that is formed through the contact wall. The membrane gas meter according to any one of claims 1 to 9, further comprising an adjustment mechanism capable of adjusting the position of the magnet by inserting an adjustment screw into the hole.

  The invention of claim 11 has a connecting shaft portion at the upper end portion to which a lever connected to the membrane of the membrane gas meter is connected, and a support shaft portion rotatably supported by the meter case at the lower end portion. A magnet holder is attached to the connecting shaft in an existing membrane gas meter having a crankshaft having a two-dimensional positioning, and a magnet is disposed on the rotating shaft of the support shaft portion, and the support shaft portion A membrane gas meter manufacturing method for manufacturing a membrane gas meter that measures a gas flow rate from a rotation amount of the crankshaft detected based on a change in magnetism by a magnetic sensor arranged on the rotation axis of the cylinder.

  The invention of claim 12 is formed by integrally forming an adjustment collar that fits into the connection shaft portion and is received in a connection hole formed in the lever, and the magnet holder. It is a manufacturing method of the film | membrane type gas meter of Claim 11 replaced | exchanged for the said adjustment collar with a magnet holder.

  The invention according to claim 13 is the membrane according to claim 11, wherein the magnet holder is mounted on an existing adjustment collar fitted to the connecting shaft portion and received in a connecting hole formed in the lever. It is a manufacturing method of a gas meter.

  According to the present invention, components of an existing membrane gas meter, in particular, a crankshaft can be used, so that a rotation detection type membrane gas meter can be easily manufactured. In particular, in the case of a gas meter used by a city gas consumer, it is legally required to renew it every 10 years, and the rotation detection type membrane that has been raised in such renewal work It is possible to manufacture a rotation detection type membrane gas meter from a gas gas meter without labor and cost.

1 is a perspective view of a membrane gas meter according to a first embodiment of the present invention. Conceptual diagram of membrane gas meter Perspective view of crankshaft with magnet holder assembled (A) Side view of crankshaft with magnet holder assembled, (B) Side view of crankshaft with magnet holder assembled Disassembled perspective view around the magnet holder Disassembled perspective view around the magnet holder Perspective view of the case body related to an existing membrane gas meter Exploded perspective view around the magnet holder according to the second embodiment Exploded perspective view around the magnet holder according to the second embodiment Exploded perspective view around the magnet holder according to the third embodiment Exploded perspective view around the magnet holder according to the third embodiment Exploded perspective view around a magnet holder according to a modified example Perspective view around magnet holder according to modification Perspective view around magnet holder according to modification Perspective view around magnet holder according to modification Perspective view around magnet holder according to modification Exploded sectional view around the magnet holder according to the modified example Perspective view around magnet holder according to modification Perspective view around magnet holder according to modification Perspective view around magnet holder according to modification

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, a membrane gas meter 10 of this embodiment has a meter case 11 made of, for example, aluminum casting. The meter case 11 is composed of a case body 20 having a substantially rectangular parallelepiped shape and an upper case 12 assembled to the upper part.

  A main body ceiling wall 22 is provided at the upper part of the case main body 20, and as shown in FIG. 2, two weighing chambers 21 partitioned by a partition wall 23 are provided below the main body ceiling wall 22 in the case main body 20. , 21 are formed. Each of the measuring chambers 21 and 21 is divided into two by measuring films 24 and 24 (corresponding to “film” of the present invention).

  In the meter case 11, a mechanism chamber 25 is provided above the main body ceiling wall 22 of the case main body 20. The mechanism chamber 25 is provided with valves 30 and 30 that are formed on the main body ceiling wall 22 and open and close communication holes 22A and 22A that communicate the measurement chambers 21 and 21 with the mechanism chamber 25.

  The measurement membranes 24, 24 and the valves 30, 30 are connected via a plurality of link members arranged in the mechanism chamber 25 including the crankshaft 40 of the present invention. Specifically, as shown in FIG. 1, the crankshaft 40 is rotatably supported by a crank base 26 fixed to the main body ceiling wall 22, and measurement films 24 and 24 are attached to the crankshaft 40. It is connected via rotating shafts 27, 27, large elbows 28, 28, and small elbows 29, 29 (corresponding to the “lever” of the present invention) that rotate with the reciprocating movement of the measurement membranes 24, 24. The valves 30 and 30 are connected via valve levers 31 and 31.

  As a result, in the membrane gas meter 10, the crankshaft 40 rotates and the valves 30, 30 reciprocate as the metering membranes 24, 24 move according to the gas flow.

  Next, the crankshaft 40 will be described. The crankshaft 40 of this embodiment has the same structure as the crankshaft of a conventional membrane gas meter. That is, as shown in FIG. 3, the crankshaft 40 includes a support shaft portion 41 that is rotatably supported by the crank base 26 (see FIG. 1), and a first projecting sideways from the upper end portion of the support shaft portion 41. A swivel portion, and a first connection shaft portion 43 that stands upward from a position displaced from the support shaft portion 41 in the first swivel portion and is connected to the valve levers 31, 31 (see FIG. 1) described above. The second turning portion 44 projecting laterally from the upper end of the first connecting shaft portion 43, and the elbow 29, 29 standing upward from a position displaced from the support shaft portion 41 in the second turning portion 44. (Refer to FIG. 1) is connected to a second connecting shaft portion 45 (corresponding to the “connecting shaft portion” of the present invention).

  The first turning part 42 is made of a substantially rectangular metal plate, the support shaft part 41 and the first connecting shaft part 43 are connected to both ends thereof, and the second turning part 44 is made of a substantially square metal plate. The first connecting shaft portion 43 and the second connecting shaft portion 45 are connected to both ends on one diagonal line.

  The 2nd connection shaft part 45 consists of a metal pin, and the cross-sectional shape has comprised "D" shape (namely, non-circular shape). Further, a groove 45 </ b> M is formed at the upper end portion of the second connection shaft portion 45.

  In the membrane gas meter 10 of the present embodiment, as shown in FIGS. 3 and 4, the magnet holder 50 including the magnet 55 is assembled to the second connection shaft portion 45 that is the upper end portion of the crankshaft 40. Yes. The magnet holder 50 has a substantially rectangular resin main plate portion 50S extending in parallel with the first turning portion 42 and the second turning portion 44, and is fitted to the second connecting shaft portion 45 at one end thereof. On the other hand, a magnet holding part 52 for holding the magnet 55 is arranged on the other end. The magnet holder 50 extends in the direction from the central axis of the second connection shaft portion 45 toward the rotation axis of the support shaft portion 41, and holds the magnet 55 on the rotation axis of the support shaft portion 41. The magnet 55 has a multipolar structure.

  The magnet holding part 52 has a plurality of positioning protrusions 52 </ b> S that protrude upward from the main plate part 50 </ b> S of the magnet holder 50 and come into contact with the side surface of the magnet 55. A claw portion 52T for holding the magnet 55 is formed on a part of the plurality of positioning protrusions 52S.

  An adjustment collar 47 is formed integrally with the magnet holder 50. The adjustment collar 47 is a cylindrical body extending downward from the one end portion of the main plate portion 50S of the magnet holder 50, and is received in circular connection holes 29A and 29A (see FIG. 7) formed in the small elbows 29 and 29. Is done. The fitting hole 51 penetrates the adjusting collar 47 and the main plate portion 50S together.

  Here, as shown in FIGS. 5 and 6, the fitting hole 51 of the magnet holder 50 has a “D” shape corresponding to the cross-sectional shape of the second connecting shaft portion 45. As a result, the magnet holder 50 is positioned with respect to the crankshaft 40, and the magnet 55 is held on the rotation shaft of the support shaft portion 41. The magnet holder 50 is prevented from coming off by an E ring (not shown) attached to the groove of the second connection shaft portion 45. The second connecting shaft portion 45 corresponds to the “non-circular shaft portion” of the present invention, the fitting hole 51 corresponds to the “non-circular hole” of the present invention, and the second connecting shaft portion 45 and the fitting hole 51. Corresponds to the “holder positioning unit” of the present invention.

  As shown in FIG. 1, the upper case 12 is formed with a support wall 13 which becomes a ceiling wall of the mechanism chamber 25, and the support wall 13 is provided with the magnetic sensor 60 of the present invention. The magnetic sensor 60 is disposed on the rotation axis of the support shaft portion 41 of the crankshaft 40, that is, at a position facing the magnet 55, and detects a change in magnetism due to rotation of the magnet 55 (that is, rotation of the crankshaft 40). , Output a pulse signal. And the calculating part which is not illustrated calculates the flow volume of gas based on this pulse signal.

  The membrane gas meter 10 of this embodiment is manufactured as follows.

  First, an existing membrane gas meter 10X is prepared, and the upper case is removed. As shown in FIG. 7, in the existing membrane gas meter 10 </ b> X, an adjustment collar 47 </ b> X received in the connection holes 29 </ b> A and 29 </ b> A of the small elbows 29 and 29 is attached to the second connection shaft portion 45 of the crankshaft 40. ing.

  The existing adjustment collar 47X is removed, and the magnet holder 50 with the adjustment collar 47 is mounted so that the cross-sectional shape of the second connection shaft portion 45 and the shape of the fitting hole 51 are matched. Then, the upper case 12 in which the magnetic sensor 60 is disposed at a position facing the magnet 55 is mounted. Thereby, the membrane gas meter 10 of this embodiment is manufactured.

  The configuration of the present embodiment is as described above. According to the present embodiment, by using the structure of the existing membrane gas meter 10X and replacing the existing adjustment collar 47X attached to the crankshaft 40 with the magnet holder 50 with the adjustment collar 47, the rotation detection type The membrane gas meter 10 can be easily manufactured. In particular, since the crankshaft 40 that requires labor for assembly is used, labor and cost for the change can be further reduced. Further, since the fitting hole 51 of the magnet holder 50 has a non-circular shape corresponding to the non-circular cross-sectional shape of the second connection shaft portion 45, the magnet 55 is positioned with respect to the crankshaft 40.

[Second Embodiment]
The membrane gas meter 10 of the present embodiment is different from the first embodiment in the structure of the magnet holder 50. That is, the magnet holder 50 of the present embodiment is provided with a positioning portion 53 at the lower end portion of the adjustment collar 47 as shown in FIGS. The positioning portion 53 protrudes downward from the main plate portion 53S and the main plate portion 53S that is in contact with the upper surface of the second turning portion 44 (corresponding to the “turning contact portion” of the present invention). It has a two-surface contact portion 53T that contacts two adjacent surfaces across one corner portion of the side surface. The two-surface contact portion 53T contacts two surfaces of the second turning portion 44 (corresponding to “first side surface” and “second side surface” of the present invention), so that the magnet holder 50 is in contact with the crankshaft 40. Is positioned. In the case of the configuration of the present embodiment, the fitting hole 51 may be D-shaped or circular as shown in FIGS.

[Third Embodiment]
The membrane gas meter 10 of this embodiment is different from the first embodiment in the configuration for positioning the magnet holder 50. Hereinafter, differences from the first embodiment will be described with reference to FIGS. 10 and 11.

  In the membrane gas meter 10 of the present embodiment, two positioning holes 44 </ b> A and 44 </ b> A are formed in the second turning portion 44. The positioning holes 44 </ b> A and 44 </ b> A are formed, for example, by making a hole at a specific position of the second turning portion 44 with the crankshaft 40 fixed to a jig that receives the support shaft portion 41. Thereby, the positioning holes 44 </ b> A and 44 </ b> A are positioned with respect to the rotation axis of the support shaft portion 41.

  The magnet holder 50 is provided with a positioning portion 53 at the lower end portion of the adjustment collar 47. The positioning portion 53 has a main plate portion 53S placed on the upper surface of the second turning portion 44, and two positioning pins 53P that protrude downward from the main plate portion 53S and are fitted into the positioning holes 44A and 44A described above. 53P. The magnet holder 50 is positioned with respect to the crankshaft 40 by fitting these positioning pins 53P and 53P into the positioning holes 44A and 44A.

[Other Embodiments]
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various other than the following can be made without departing from the scope of the invention. It can be changed and implemented.

(1) In the above embodiment, the magnet holder 50 is made of resin, but may be made of metal.

(2) In the above embodiment, the adjustment collar is integrally formed with the magnet holder 50. However, as shown in FIG. 12, the adjustment collar and the magnet holder 50 may be provided separately. In this case, the existing adjustment collar 47X can be used.

  When the adjustment collar and the magnet holder 50 are separately provided, the material of the magnet holder 50 may be the same as or different from the material of the adjustment color. For example, the adjustment collar may be made of metal and the magnet holder 50 may be made of resin. In this case, as shown in FIG. 13, the vicinity of the fitting hole 51 in the magnet holder 50 is constituted by a metal annular member 50K, and the annular member 50K is integrated with the resin main plate portion 50S by insert molding or the like. It is preferable to attach it.

(3) In the above embodiment, the main plate portion 50S of the magnet holder 50 and the positioning protrusion 52S are integrally formed of resin. For example, the resin positioning protrusion 52S is integrally formed with the metal main plate portion 50S. An attached configuration may be used.

(4) In the above embodiment, the magnet 55 is fixed by the positioning protrusion 52S protruding upward from the main plate portion 50S. For example, as shown in FIG. 14, the main plate portion 50S of the magnet holder 50 is used. 15 may be fixed to the main plate portion 50S of the magnet holder 50 from above by attaching a cover member 50L for holding the magnet 55, as shown in FIG. May be.

(5) In the above embodiment, the magnet holding portion 52 is formed integrally with the main plate portion 50S of the magnet holder 50. For example, as shown in FIG. 16, the magnet holding portion 52 is connected to the main plate portion 50S. It is good also as a structure which makes it a different body and is fixed by snap fitting etc.

(6) In the above embodiment, the magnet holder 50 is secured by the E-ring (not shown) mounted in the groove 45M of the second connecting shaft portion 45. However, as shown in FIG. An engagement protrusion 50T that engages with the groove 45M (corresponding to the “engagement groove” of the present invention) of the second connecting shaft portion 45 may be provided on the inner surface of the fitting hole 51.

(7) Moreover, as shown in FIG. 18, the structure which provides the screw hole 47N in the side surface of the adjustment collar 47, and fixes it with a fixing screw (not shown) may be sufficient.

(8) Also, as shown in FIG. 19, a screw hole is formed in the second connecting shaft portion 45, and a fixing screw 57 is attached to the screw hole together with the washer 56 from above the magnet holder 50. Good.

(9) As shown in FIG. 20, an adjustment screw hole 52N is provided in a part of the positioning protrusion 52S (corresponding to the “contact wall” of the present invention), and the position of the magnet 55 can be finely adjusted by the adjustment screw 58. You may comprise. The adjustment screw hole 52N and the adjustment screw 58 correspond to the “adjustment mechanism” of the present invention.

10 Membrane gas meter 11 Meter case 24 Metering membrane (membrane)
25 Mechanical room 29 Small elbow (lever)
40 Crankshaft 41 Support shaft portion 44 Second turning portion (turning support portion)
45 Second connection shaft part (connection shaft part)
47 Adjustment collar 50 Magnet holder 51 Fitting hole (non-circular hole)
55 Magnet 60 Magnetic sensor

Claims (13)

Membrane having a crankshaft having a connecting shaft portion at the upper end portion to which a lever connected to a membrane of a membrane gas meter is connected, and a supporting shaft portion rotatably supported by the meter case at the lower end portion In the type gas meter,
A magnet holder attached to the upper end portion of the connecting shaft portion and disposing a magnet on the rotation axis of the support shaft portion;
The meter case is fixed to the upper side of the ceiling wall facing the crankshaft from above and disposed on the rotating shaft of the support shaft portion, and detects the amount of rotation of the crankshaft based on the change in magnetism by the magnet. With a magnetic sensor to do
A calculation unit for calculating the flow rate of the gas based on the rotation amount of the crankshaft detected by the magnetic sensor;
A membrane gas meter comprising: a holder positioning unit that two-dimensionally positions the magnet holder with respect to the crankshaft in a two-dimensional plane orthogonal to the central axis of the support shaft unit. The upper end portion of the connecting shaft portion forms a non-circular shaft portion having a non-circular cross section,
2. The membrane gas meter according to claim 1, wherein the holder positioning portion includes the non-circular shaft portion and a non-circular hole formed in the magnet holder and into which the non-circular shaft portion is fitted. Among the crankshafts, the turning support portion that supports the lower end portion of the connecting shaft portion includes a first side surface and a second side surface that are adjacent to each other across a corner portion and are parallel to the rotation center of the support shaft portion. Is provided,
The holder positioning portion includes an upper end portion of the connection shaft portion, a fitting hole formed in the magnet holder, into which the upper end portion of the connection shaft portion is fitted, the first side surface, and the second side surface. The membrane gas meter according to claim 1, further comprising a two-surface contact portion formed on the magnet holder and contacting the first side surface and the second side surface.   The holder positioning portion is provided in two positioning holes provided in a turning support portion that supports a lower end portion of the connecting shaft portion of the crankshaft, and provided in the magnet holder. The membrane gas meter according to claim 1, comprising two positioning pins to be fitted.   5. The membrane gas meter according to claim 1, wherein the magnet holder is provided integrally with an adjustment collar that is received in a connection hole formed in the lever. 6.   5. The device according to claim 1, wherein the magnet holder and an adjustment collar received in a connection hole formed in the lever are separately attached to the connection shaft portion. Membrane gas meter.   The outer surface of the connecting shaft portion and the inner surface of the fitting hole formed in the magnet holder and into which the upper end portion of the connecting shaft portion is fitted are engaged with each other with an engaging groove and an engaging protrusion. The membrane gas meter according to any one of claims 1 to 6, wherein: The connecting shaft portion is provided with a screw hole opened upward,
The membrane gas meter according to any one of claims 1 to 6, wherein a fixing screw for retaining the magnet holder is attached to the screw hole. Screw holes are provided on the side surfaces of the adjustment collar,
6. The membrane gas meter according to claim 5, wherein a fixing screw for fixing the magnet holder to the connecting shaft portion is attached to the screw hole.   The magnet holder includes an adjustment screw inserted into a main plate with which the bottom surface of the magnet contacts, a contact wall that protrudes from the main plate and contacts the side surface of the magnet, and an adjustment screw hole formed through the contact wall. The membrane gas meter according to any one of claims 1 to 9, further comprising an adjustment mechanism capable of adjusting the position of the magnet.   An existing crankshaft having a connecting shaft portion at the upper end portion to which a lever connected to the membrane of the membrane gas meter is connected, and a supporting shaft portion rotatably supported by the meter case at the lower end portion A magnet holder is attached to the connecting shaft of the membrane gas meter in a two-dimensionally positioned state, a magnet is disposed on the rotating shaft of the support shaft portion, and is disposed on the rotating shaft of the support shaft portion. A membrane gas meter manufacturing method for manufacturing a membrane gas meter for measuring a gas flow rate from a rotation amount of the crankshaft detected by a magnetic sensor based on a change in magnetism. An adjustment collar that fits into the connection shaft portion and is received in a connection hole formed in the lever, and the magnet holder are integrally formed,
The manufacturing method of the film | membrane type gas meter of Claim 11 which replaces | exchanges the existing adjustment collar for the said adjustment collar with a magnet holder.   12. The method of manufacturing a membrane gas meter according to claim 11, wherein the magnet holder is mounted on an existing adjustment collar that is fitted to the connection shaft portion and received in a connection hole formed in the lever.

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