JP4384925B2 - Membrane gas meter membrane support structure - Google Patents

Description

  The present invention relates to a membrane support structure for a membrane gas meter having a mechanism for changing a reciprocating motion of a membrane into a swinging motion of a blade as a metering means.

The operation principle of the conventional membrane gas meter will be explained. First, as shown in FIG. 11, the gas passes through the valve 3 and the distribution chamber 4 from the inlet 2 of the meter body 1 and enters one of the front and rear measuring chambers 5 and 6. Each of the measuring chambers 5 and 6 is further divided into front chambers 8 and 9 and rear chambers 10 and 11 by a membrane 7, and among these chambers, the membrane 7 moves and widens due to a pressure difference. On the other hand, the gas in the room narrowed by the movement of the membrane 7 is discharged again to the outlet 12 through the distribution chamber 4 and the valve 3. Further, as shown in FIG. 2, the reciprocating motion of the membrane 7 is transmitted to the link mechanism 14 outside the measuring chambers 5 and 6 after being changed to the swinging motion of the blades 13 in the measuring chambers 5 and 6 into which gas has entered. Finally, the meter support (not shown) is driven. Further, as shown in FIGS. 12A to 12D, when the valve 3 rotates to a predetermined angle in accordance with the movement of the link mechanism 14, the way of communication between the valve 3 and the distribution chamber 4 changes, and the inlet 2 The rooms of the measuring chambers 5 and 6 that communicate with each other are switched, and the room that communicates with the outlet 12 is switched. Accordingly, the room where the gas enters and exits changes in the order of (a), (b), (c), and (d) in FIG. 12 with the use of the gas, and the front and rear membranes 7 reciprocate in sequence accordingly. As a result, gas is metered.
11 and FIG. 12 correspond to each other.

  Here, the reciprocating motion of the membrane 7 can change the swinging motion of the blade 13 as described above, but the supporting structure of the membrane 7 is a pair of membrane plates sandwiching the membrane 7 as shown in FIGS. The bearing 16 is fixed to 15 and 15, and the bearing 16 is fitted and engaged with the short shafts 17 a and 17 b at the tip of the blade 13. Further, the shaft through holes 18a and 18b of the bearing 16 were substantially C-shaped.

The bearing 16 used here is generally attached and detached at both shaft through-holes 18a and 18b provided above and below the bearing 16 so that both the short shafts 17a and 17b can be fitted into each other by snapping. The possible notches were respectively provided with the same width in the upper and lower sides. In this way, the engagement state between the bearing 16 and the short shafts 17a and 17b of the blade 13 is weak. For example, when a strong impact is applied from the outside when the gas meter is installed on the site or during transportation. The short shafts 17a and 17b are unexpectedly detached from the bearing 16. Further, the bearing 16 plays a role of transmitting the movement of the film 7 to the short shafts 17a and 17b. Therefore, the shape of the shaft through holes 18a and 18b affects the movement of the short shafts 17a and 17b. The shapes of the conventional shaft through holes 18a and 18b are such that the widths of the notches 19a and 19b are formed to be somewhat wide in order to facilitate the fitting of the bearing 16 and the short shafts 17a and 17b. When the short shafts 17a and 17b hit the notches 19a and 19b at positions corresponding to the reciprocating direction of the short shafts 17a and 17b, and the short shafts 17a and 17b are transmitted to the blade 13, the rattling of the blade 13 is large. As a result, there is a problem that a measurement error occurs.
Japanese Patent Laying-Open No. 2003-14521 (first page, FIG. 1)

  The present invention prevents unintentional detachment of the membrane from the gas meter main body, and the force transmitted from the bearing fixed to the membrane side to the blade axis is uniform during forward and backward movement of the membrane. The purpose is to be.

  The invention according to claim 1 of the present invention has measuring chambers in front and rear of the meter body, and a part of the blade shaft is inserted into each measuring chamber, and the blade fixed to the blade shaft swings back and forth. Further, the bearing is connected to the wing, the bearing is fixed to a pair of membrane plates sandwiching the membrane, and the membrane support structure of the membrane gas meter in which the membrane reciprocates in each measuring chamber. And the lower part protrudes in opposite directions, the bearing has a U-shape, and each of the engaging pieces that are vertically opposed to each other has a notch in each through hole that engages both the short axes. The notch on either side of the notches can be inserted into the through-hole of the shaft through the short shaft and cannot be removed from the notch of the short shaft. The width of the notch on the other side is such that the short shaft can be snapped on and off. And wherein the door.

  The shape of the notch provided in the through hole is generally provided with a straight cut along the through direction of the through hole. However, for example, the shape may be a waveform, and the shape is particularly limited. Not what you want. The width of both cutouts is narrower on one side than the other, but the specific cutout width is such that one can be snapped on and off, and the other is fitted with a short shaft in the through hole. It is sufficient that the width is such that it cannot be easily removed.

  The gas meter formed as described above has a structure in which the short axis of one wing is inserted into the narrower through-hole of the notch so that it cannot be easily removed by an unexpected external force. The other wing shaft can be snap-fitted into the through-hole with the wider notch, so that after inserting the short shaft into the narrower notch, snap into the wider one. By taking the procedure of fitting into the equation, the wing and the membrane can be easily attached and detached.

Further, in the invention according to claim 2 of the present invention, since each notch is provided at a location different from the reciprocating direction of both short axes, both the short axes do not hit each notch during the reciprocating movement of the membrane, As a result, the short shafts do not rattle due to slight recesses caused by the respective notches.
Here, the portion where the notch is provided may be provided anywhere on the engagement piece as long as it does not coincide with the reciprocating direction of both short axes during the reciprocating motion of the membrane.

  According to the first aspect of the present invention, the width of one notch in each of the upper and lower shaft through holes is made narrow so that the minor axis cannot be pulled out, and the width of the other notch is made shorter than the minor axis. Since it is widely formed so that it can be fitted into a snap type, it is easy to engage the blade with the bearing, and the blade is not easily detached from the bearing, so when installing the gas meter or transporting the gas meter It keeps the engaged state firmly even at times.

  According to the invention of the second aspect of the present invention, in addition to the effect of the invention of the first aspect, the two short axes do not hit the dent formed by the notch of the through-hole during the reciprocating movement of the film. As a result, the measurement accuracy is expected to be further improved.

Hereinafter, the membrane support structure of the membrane gas meter of the present invention will be described 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.

First, the membrane support structure changes the reciprocating motion of the membrane 7 into the swinging motion of the blade 13, and as shown in FIG. 9 or 10, the blade shaft 20 extends from the outside of the measuring chambers 5 and 6 into the measuring chambers 5 and 6. Is inserted into the blade shaft 20, the blade 13 is fixed to the blade shaft 20, the bearing 16 is engaged with the short shafts 17 a and 17 b at the tip of the blade 13, and the bearing is fixed to the film 6 sandwiched between the pair of film plates 15 and 15. 16 is fixed.
The upper part of the blade shaft 20 is fixed to the link mechanism 14, and the link mechanism 14 moves as the blade shaft 20 rotates.

  As shown in FIG. 5, the bearing 16 has a U-shape in which the engagement piece 22 protrudes laterally from the upper and lower sides of the mediating piece 21, and the engagement holes 22a and 22b have C-shaped shaft through holes. 18a and 18b are opened facing each other, and a male screw 23 for fixing to the membrane 7 side protrudes from the intermediate height portion of the mediating piece 21 toward the opposite side to the engaging pieces 22a and 22b (see FIG. 4). Further, as shown in FIG. 4, the membrane 7 sandwiched between the membrane plates 15 and 15 is fixed between the nut 24 screwed into the male screw 23 and the mediating piece 21.

  As shown in FIGS. 1 to 4, the wing 13 is bent in accordance with the dish shape of the membrane 7 in plan view, and the tip side is lower than the wing shaft 20 side as shown in FIG. The bearing 16 engaged with the portion is disposed at the center of the membrane 7 (see FIG. 9). On the upper side and the lower side of the front vertical bar 27, the short axes 17a and 17b are opposite to each other, that is, the upper short axis 17a is directed upward from the vertical bar 27, while the lower short axis 17b is Each projecting downward from the vertical beam 27. Furthermore, the tip of the upper short shaft 17a is tapered so that it can be easily inserted into the through hole 18a.

  When engaging the bearing 16 with the blade 13, first, as shown in FIG. 7A, the shaft through hole 18 a of the engagement piece 22 a on the upper side of the bearing 16 is connected to the short shaft 17 a on the upper side of the vertical beam 27 in the blade 13. As shown in FIG. 7 (b), a procedure is adopted in which the lower short shaft 17b is snapped into the shaft through hole 18b of the lower engaging piece 22b as shown in FIG. Then, as shown in FIG. 7C, with the upper short shaft 17a as a base point, the lower short shaft 17b is pushed into the notch 19b of the lower shaft through hole 18b as it is, so that the upper engagement piece In 22a, the short shaft 17a uses the elasticity of the engaging piece 22a to slightly expand the notch 19a of the shaft through hole 18a, so that the short shaft through hole 18b and the short shaft through hole 18b are short as shown in FIG. The shaft 17b is snapped through the notch 19b, and the blade 13 and the bearing 16 are engaged.

  Of the short shafts 17a and 17b engaged with the shaft through holes 18a and 18b, the engagement state between the upper short shaft 17a and the shaft through hole 18a is notched as shown in FIG. Since the width of 19a is narrow, the short shaft 17a cannot be detached from the notch 19a. Next, as shown in FIG. 8 (b), the lower short shaft 17b and the shaft through hole 18b are engaged with each other so that the shaft diameter of the short shaft 17b is slightly larger than the width of the notch 19b. Is wider than the upper notch 19a. Therefore, when engaging, the peripheral portion of the notch 19b is temporarily deformed by the elasticity of the engaging piece 22b, and the short shaft 17b is fitted into the through hole 18b. Further, the positions of the notches 19a and 19b are provided at locations that do not coincide with the reciprocating direction of the membrane 7. Further, in the present embodiment, as shown in FIG. 3, the notches 19a and 19b are provided toward the blade shaft 20 side, so that the short shafts 17a and 17b and the notches 19a and 19b when the membrane 7 reciprocates are provided. As a result, there is no rattling during the reciprocating motion of the membrane 7, so that highly accurate weighing is expected.

  Next, the membrane 7 is formed in a dish shape with an elastic material, and the outer peripheral edge portion is sandwiched and sealed from the front and rear, and the portions other than the sandwiched portion reciprocate back and forth by the pressure of the gas. Further, a hole (not shown) through which the male screw 23 of the bearing 16 is passed is formed in the center of the membrane 7 and the membrane plate 15.

It is a longitudinal cross-sectional view of the film | membrane support structure of the film | membrane type gas meter of this invention. Similarly, it is a longitudinal cross-sectional view of the membrane support structure of the membrane gas meter of the present invention. It is a cross-sectional view of the membrane support structure of the membrane gas meter of the present invention. It is explanatory drawing which expands and shows A in FIG. It is a perspective view which shows the bearing of the film | membrane type gas meter of this invention. It is a side view which shows the wing | blade of the membrane type gas meter of this invention. (A), (B), (C), and (D) are explanatory views showing a procedure of engagement between the short shaft of the blade and the bearing. (A) is the CC sectional view taken on the line in FIG.7 (d). (B) is a cross section taken along the line DD in FIG. It is the front view which notched a part which shows the whole film | membrane type gas meter of this invention. It is the side view which notched a part which shows the whole film | membrane type gas meter of this invention. (A), (B), (C), and (D) are cross-sectional views showing that the room where 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 a cross-sectional view showing a membrane support structure of a conventional membrane gas meter. (A) is a side view of a wing of a conventional membrane gas meter. (B) is a sectional view taken along line BB in (A). It is the top view which decomposed | disassembled the wing | blade and bearing of the film | membrane support structure of the conventional film | membrane type gas meter.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Meter main body 5,6 Measuring chamber 7 Membrane 13 Wing 15 Membrane plate 16 Bearing 17a, 17b Short shaft 18a, 18b Shaft through hole 19a, 19b Notch 20 Blade shaft 22a, 22b Engagement piece

Claims (2)

There are measuring chambers (5, 6) before and after the meter body (1), and a part of the blade shaft (20) is inserted into each measuring chamber (5, 6) and fixed to the blade shaft (20). The wing (13) swings back and forth, the bearing (16) is connected to the wing (13), and the bearing (16) is fixed to a pair of membrane plates (15) sandwiching the membrane (7). A membrane-type gas meter membrane support structure in which the membrane (7) reciprocates in the chamber (5, 6),
The wing (13) protrudes the short axis (17a, 17b) in the opposite direction to the upper part and the lower part at the tip part,
The bearing (16) is U-shaped, and the shaft through holes (18a, 18b) for engaging the short shafts (17a, 17b) with the engaging pieces (22a, 22b) facing vertically are respectively provided. ) Is formed in a C shape with notches (19a, 19b),
Of the notches (19a, 19b), the notch (19a) on either side can be inserted into the through-hole (18a) through the shaft through hole (18a) by the short shaft (17a). 17a) is formed in such a width that it cannot be removed from the notch (19a), and the notch (19b) on the other side is formed in such a width that the short shaft (17b) can be attached and detached in a snap manner. The membrane support structure of the membrane gas meter. The membrane support structure according to claim 1, wherein each of the notches (19a, 19b) is provided at a location different from the reciprocating direction of both short axes (17a, 17b).

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