JP2005227209A - Bearing lock structure for metering diaphragm of diaphragm type gas meter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing lock structure for a metering diaphragm of a diaphragm type gas meter capable of preventing tightening of a screw from getting loose to cause a metering error. <P>SOLUTION: In this bearing lock structure for the metering diaphragm of the diaphragm type gas meter wherein a bearing 15 is engaged with a shaft 14 in a tip of a blade 12 to convert a reciprocating motion of the metering diaphragm into an oscillation motion of the blade, and wherein the bearing is screwed in the central part of diaphragm sheets 16 sandwiching the metering diaphragm therebetween from both sides, a whirl-stop means 21 for regulating rotation of the bearing is provided around a screwed portion as the center in at least one side out of the bearing and the diaphragm sheets. A recessed part 19 is engaged with a protruded part 20 in the whirl-stop means 21, the recessed part is provided in one out of the diaphragm sheets and the bearing, and the protruded part is provided in the other side thereof. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a structure for disposing a membrane plate in front of and behind a metering membrane that reciprocates in a metering chamber, and stopping a bearing on both membrane plates in a state of sandwiching the metering membrane.

  The operation principle of the membrane gas meter will be described. First, as shown in FIG. 7, the gas passes from the inlet 1 of the meter body M through the valve 2 and the distribution chamber 3 and enters one of the front and rear measuring chambers 4 and 5. Each of the measuring chambers 4 and 5 is divided into front chambers 7 and 8 and rear chambers 9 and 10 by a measuring membrane 6, and the measuring membrane 6 moves wide due to a pressure difference in a room where gas enters, while the measuring membrane 6 The gas in the room narrowed by the movement of 6 is discharged again to the outlet 11 through the distribution chamber 3 and the valve 2. As shown in FIG. 8, the reciprocating motion of the metering membrane is transferred to the link mechanism 13 outside the metering chamber after being changed to the swinging motion of the blade 12 in the metering chamber into which the gas has entered, and finally the meter indicator (not shown) ) Is driven. Further, as shown in FIGS. 8 (A) to 8 (D), when the valve 2 rotates by a predetermined angle in accordance with the movement of the link mechanism 13, the way of communication between the valve 2 and the distribution chamber 3 changes, and it communicates with the inlet. The room of the measuring room is switched and the room communicating with the exit is switched. Therefore, the room in which gas enters and exits changes in the order of (a), (b), (c), and (d) in FIG. 7 as the gas is used. The gas is metered. 7 and 8 correspond to each other.

By the way, as shown in FIG. 9 or FIG. 10, the bearing 15 is engaged with the shaft 14 at the tip of the wing 12 to connect the swingable wing 12 and the measuring membrane 6 to each other. The bearing 15 is screwed to the two film plates 16 that sandwich the film. The screwing structure by the bearing 15 will be described in more detail. One screw 17 projecting from the bearing 15 is passed through a hole in the center of the measuring membrane 6 and the membrane plate 16 and tightened with a nut 18 from the opposite side. Structure.
Japanese Patent Laid-Open No. 2003-14521 (FIGS. 1 to 3 and FIG. 6)

  However, since the bearing is simply fixed with a single screw, if a force is applied to the bearing when the bearing is mounted on the shaft during assembly, the screw tightens loosely as the bearing rotates. There is a possibility that the mounting position is slightly shifted within the play range of the through hole to be penetrated. If the tightening is loosened, the front and back rooms that should have been partitioned by the measurement membrane are slightly communicated with each other, causing a measurement error. Further, if the mounting position is deviated, wrinkles or the like are generated in the measurement film, which causes a measurement error.

  The present invention was developed in view of the above circumstances, and an object of the present invention is to provide a measurement stopper for a measurement membrane for a membrane gas meter that can prevent loosening of a screw that causes a measurement error. .

  The present invention has front and rear measuring chambers in the meter body, each measuring chamber is partitioned into front and rear chambers by measuring membranes, and the measuring membranes are reciprocated as the gas flows into the chambers. In order to convert the movement into the oscillating motion of the blade, the bearing is engaged with the shaft at the tip of the blade, and the bearing is screwed to the center of the membrane plate sandwiching the measurement membrane from the front and back. Assumes a bearing retaining structure for the measuring membrane.

  And the rotation prevention means which controls that a bearing rotates centering on a screwing location is provided in at least one of the bearing and the film board.

  The screw may be separate from the bearing or may be integral. As an example of the anti-rotation means, for example, a convex portion that protrudes in the circumferential direction of the bearing is formed on the membrane plate, and the convex portion interferes with the bearing to prevent rotation. As another example, as in the invention of claim 2, the anti-rotation means may be fitted by a concavo-convex portion, and a concave portion may be provided on one of the membrane plate and the bearing, and a convex portion may be provided on the other. .

  According to the present invention, the rotation of the bearing relative to the membrane plate can be prevented by the anti-rotation means. Therefore, even when a force is applied to the bearing when the bearing is mounted on the shaft, the rotation of the bearing can be prevented, and accordingly, the screw is loosened. As a result, accurate measurement can be ensured.

  A measuring film bearing retaining structure for a membrane gas meter according to the present invention will be described below with reference to the drawings. In addition, the same code | symbol shall be attached | subjected to the component which is common in a prior art example.

  As shown in FIG. 1, the measuring film bearing retaining structure is configured such that the bearing 15 is screwed to the two film plates 16 sandwiching the measuring film 6 from the front and back, and the recess 19 serving as the bearing detent means 21 is provided. The convex portion 20 is provided separately for both the bearing 15 and the membrane plate 16.

  As shown in FIG. 2, the bearing 15 is formed by bending arms 23 on the upper and lower sides of the abutting plate 22 pressed against the membrane plate 16 in a direction away from the abutting plate 22, and projecting the projecting portion 20 from the abutting plate 22 side to the membrane plate side. It protrudes toward. More specifically, the upper portion of the bearing 15 projects the extension plate 24 upward from the base front portion of the arm 23, and projects the pin-shaped convex portion 20 toward the membrane plate side at the tip of the extension plate 24. The part is provided with a shaft through hole 25 for accommodating the shaft 14. The shaft through hole 25 is C-shaped, and the shaft 14 can be fitted into the snap type. The lower part of the bearing 15 is formed symmetrically with the upper part of the bearing 15. Further, the abutting plate 22 has a screw hole 26 in the center thereof.

  As shown in FIG. 3 or FIG. 4, the membrane plate 16 has a disc shape, and ribs 27 that are separated from the measuring membrane 6 are formed concentrically, and concave portions 19 are formed above and below the ribs 27. A screw hole 28 is formed in the center of the membrane plate 16. Since the convex portion 20 fitted in the concave portion 19 is away from the measuring film 6 as shown in FIG. 1, the measuring film 6 is not affected.

  The measuring membrane 6 is formed in a dish shape with an elastic material, and a seal is secured by sandwiching the outer peripheral edge portion from the front and back, and the portions other than the sandwiched portion reciprocate back and forth by the gas pressure (FIG. 1). FIG. 5). In addition, a screw hole (reference numeral omitted) is also formed in the central portion of the measurement membrane 6.

  In addition, as shown in FIG. 5 or FIG. 6, the blades 12 with which the bearings 15 are engaged have shafts 14 protruding upward and downward at the tip thereof. Therefore, by passing the lower shaft through hole 25 of the bearing 15 through the lower shaft 14 and the upper shaft through hole 25 through the upper shaft 14, the bearing 15 is engaged with the shaft 14 at the tip of the blade 12. Match. Incidentally, as shown in FIG. 9, the base portion of the blade 12 is fixed to the lower portion of the blade shaft 29 that enters from the outside of the measuring chambers 4 and 5 into the measuring chambers 4 and 5.

  The present invention is not limited to the above embodiment. For example, the structure which provides the convex part 20 in the film | membrane board 16 and provides the recessed part 19 in the bearing 15 may be sufficient.

It is a longitudinal cross-sectional view which shows the bearing stop structure for measurement films | membranes of the film | membrane type gas meter of this invention. (A), (B), (C), (D), (E), (F) are a plan view, a left side view, a front view, a right side view, and a cross-sectional view along line AA of the bearing. FIG. It is drawing which shows the state which attached the bearing to the film board. (A), (b) is a front view of the membrane plate, and an end view taken along line AA. It is a top view which shows the engagement relationship of a wing | blade and a bearing. (A), (b) is a front view showing the engagement relationship between the blade and the bearing, and is a cross-sectional view taken along line AA. (A), (B), (C), and (D) are cross-sectional views showing that the room in which gas enters and exits is switched. (A), (b), (c), and (d) are explanatory views showing the relationship between the movement of the link mechanism and the rotational movement of the valve and the swinging movement of the blade. It is sectional drawing which shows the bearing stop structure for the measurement films | membranes of the conventional film | membrane type gas meter. It is sectional drawing of another direction which shows the bearing stop structure for the measurement films | membranes of the conventional film | membrane type gas meter.

Explanation of symbols

M Meter body 4,5 Weighing chamber 6 Weighing membrane 7,8 Room (Previous room)
9,10 rooms (rear rooms)
12 Wings 14 Shafts 15 Bearings 16 Membranes 19 Concave parts 20 Convex parts 21 Non-rotating means

Claims (2)

The meter body (M) has front and rear measuring chambers (4, 5). Each measuring chamber is divided into front and rear chambers (7 to 10) by a measuring membrane (6). In order to reciprocate the measuring membrane and convert the reciprocating motion of the measuring membrane into the swinging motion of the blade (12), the bearing (15) is engaged with the shaft (14) at the tip of the blade, In the membrane-film metering membrane bearing retaining structure in which the bearing is screwed to the center of the membrane plate (16) sandwiched from the front and rear,
A membrane film metering membrane bearing stopper structure, characterized in that at least one of the bearing and the membrane plate is provided with a detent means (21) for restricting rotation of the bearing around the screwing portion.   The anti-rotation means (21) is a fitting by a concave portion (19) and a convex portion (20), and the concave portion is provided in one of the membrane plate and the bearing, and the convex portion is provided in the other. Bearing stop structure for metering membrane of membrane gas meter.

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