JP2880068B2 - Membrane gas meter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a membrane gas meter.
In particular, the present invention relates to a membrane gas meter in which the instrumental performance and sensitivity performance of the membrane gas meter are improved by devising a method of attaching a sac provided in a measurement chamber of the membrane gas meter.

[0002]

2. Description of the Related Art Generally, a gas meter measures and displays the flow rate of gas flowing through a gas pipe according to the amount of gas used by a gas appliance installed inside a house. The gas flow rate in the gas meter is measured by installing a diaphragm film called a sac membrane in a weighing chamber in the gas meter and performing the reciprocating operation of the sac membrane in the measuring chamber.

FIG. 3 (a) shows the structure of a measuring chamber 5 in a conventional membrane gas meter, wherein 1 is a sac, 2 is a sac, 3 is a weighing chamber body as a first casing, 4 is a membrane plate of a measuring chamber which is a second casing, 5 is a measuring chamber, 3
0 is a concave portion, 31 is a bottom surface, 32 is a side surface, 33 is a joining surface, 3
4 is a rib receiving groove, 40 is a concave portion, 41 is a bottom surface, 42 is a side surface, and 43 is a joining surface.

The measuring chamber 5 is formed by overlapping a concave portion 30 provided in the measuring chamber body 3 with a concave portion 40 of the membrane plate 4 attached to the measuring chamber body 3. A diaphragm-shaped sac membrane 1 is sandwiched between the joints between the weighing chamber body 3 and the membrane plate 4, and the sac membrane 1 partitions the inside of the weighing chamber 5 into two chambers. The capsular membrane 1 has gas resistance, and reciprocates in the measuring chamber 5 in accordance with the gas flow rate, and the gas flow rate is measured by a measuring mechanism (not shown) by the number of reciprocating operations of the capsular membrane.

The concave portion 30 of the measuring chamber body 3 has a bottom surface 31 and a side surface 32, and the side surface 32 on the opening end side of the concave portion is tapered so as to open outward. Further, a rib receiving hole 34 for receiving a rib of the membrane 1 described later is provided in the joint surface 33 of the measuring chamber body 3 with the membrane plate 4.

The membrane plate 4 has a concave portion 40 formed by a bottom surface 41 and a side surface 42, and a joining surface 43 provided over the entire area around the opening end of the concave portion 40. It has an open taper shape. The length of the joint surface 43 of the membrane plate 4 with the measuring chamber body 3 is the same as the length of the joining surface 33 of the measuring chamber body 3.

The sac membrane 1 comprises a flange 10 sandwiched between the measuring chamber body 3 and the membrane plate 4, and an operating section 2 reciprocating in the measuring chamber 5.
0, and is formed using synthetic rubber as a main material so as to conform to the shape of the concave portion 30 of the measuring chamber body 3. The shapes of the flange 10 and the operation unit 20 will be described in detail with reference to FIGS. As shown in FIG. 4, the flange 10 includes a flange 11 and a rib 12 formed on an end of the flange 11. The operation section 20 has a substantially truncated pyramid shape having a slope 21 and an upper bottom 22. Further, on both surfaces of the upper bottom 22, sac plates 2 for preventing the shape deformation during the reciprocating operation of the operation unit 20 during the reciprocating operation and keeping the weighing volume constant are attached. The edge of the sac 2 is slightly bent away from the joint surface. FIG. 3B is a cross-sectional view showing a state where the sac 2 is attached to both surfaces of the upper bottom 22 of the sac 1.

In the membrane gas meter configured as described above, the membrane 1 according to the flow rate of the gas flowing through the gas metering chamber 5.
Makes a reciprocating motion, and when the membrane 1 reciprocates one time, for example, the rotating shaft that makes one rotation in conjunction with this makes one revolution. Further, a magnet is attached to one end of the rotating shaft, and a member such as a reed switch capable of detecting the magnetic force of the magnet is provided at a portion outside the rotation locus of the magnet. When the magnet rotates and passes in front of the reed switch, the reed switch is turned on, and an on / off signal (pulse signal) of the reed switch is input to a control circuit such as a microcomputer (not shown) as a gas flow rate detection signal. The microcomputer calculates the flow rate of the gas based on the pulse signal. Note that an MR element (magnetoresistive element) or a Hall element may be used instead of the reed switch.

[0009]

However, in the membrane gas meter constructed as described above, as shown in FIG. 5 (a), the collar 10 of the sac membrane and the operating part when the sac membrane 1 is formed. Since the curved boundary portion (R portion) 15 with 20 is not sandwiched between the measuring chamber body 3 and the membrane plate 4, the sac membrane 1
When the reciprocating motion is reversed, a force is applied to the radius portion 15 to return to the curved state of the molded state, and this force causes a change in the driving torque in the reciprocating motion, and the instrumental performance and sensitivity performance of the membrane gas meter are changed. There is a problem that the variation occurs. Further, as shown in FIG. 5 (b), the sac 2 attached to both surfaces of the upper bottom 22 of the sac 1 is attached so as to cover only the plane portion of the upper plate 22,
Since the curved boundary (the rounded portion) 25 between the slope 21 and the upper bottom 22 of the operating part 20 is not sandwiched by the sac 2 when the sac 1 is formed, the reversal when the sac 1 reciprocates. Sometimes, a force is applied to the radius portion 25 to return to the curved state of the molded state, and this force causes a fluctuation in the driving torque in the reciprocating motion, resulting in a variation in instrumental performance and sensitivity performance of the membrane gas meter. There is.

Therefore, the present invention eliminates the influence of the radius portion generated during the formation of the sac membrane on the reciprocating movement of the sac membrane in the reciprocating movement of the sac membrane in the membrane gas meter. It is an object of the present invention to provide a film-type gas meter capable of reducing the fluctuation of the driving torque in the above-mentioned method so that the instrument difference performance and the sensitivity performance of the film-type gas meter can be made uniform.

[0011]

According to a first aspect of the present invention, there is provided a membrane gas meter having a gas-resistant sac membrane in a metering chamber of a gas meter. A membrane gas meter that reciprocates the envelope and measures the flow rate of gas by the number of reciprocating operations of the envelope, wherein the envelope is,
It comprises a substantially quadrangular truncated pyramid or substantially truncated cone-shaped operating part having a slope and an upper base, and a flange provided around the end of the slope, and the first flange constituting the measuring chamber. In a membrane gas meter in which the sac membrane is fixed in the measuring chamber by being sandwiched between the casing and the second casing, a portion sandwiching the flange portion of the first casing and the second casing, Extend until reaching the slope of the working part of the sac, and the boundary between the collar part and the working part of the sac,
It is characterized in that the membrane is fixed in the measuring chamber by being sandwiched between the first casing and the second casing.

The gas meter of the second embodiment of the present invention is provided with a gas-resistant sac membrane in the measuring chamber of the gas meter, and reciprocates the sac membrane in accordance with the flow rate of the gas. A membrane gas meter for measuring a gas flow rate by the number of reciprocating motions of a membrane, wherein the sac membrane has a substantially quadrangular truncated pyramid or substantially truncated cone-shaped operating portion having a slope and an upper bottom, and an end of the slope. A flange provided around the portion, the collar is sandwiched between a first casing and a second casing constituting the measuring chamber, whereby the bladder membrane is fixed in the measuring chamber, The upper bottom of the operating section is formed at the boundary between the slope and the upper bottom of the operating section of the sac in a membrane gas meter sandwiched by sac plates from both sides to prevent shape deformation during weighing. The curved portion is formed so that the curved portion is sandwiched between the curved plates. It is characterized in that.

Further, the membrane gas meter according to the third aspect of the present invention is provided with a gas-resistant sac membrane in the measuring chamber of the gas meter. A membrane gas meter for measuring a gas flow rate by the number of reciprocating motions of a membrane, wherein said membrane has a substantially quadrangular truncated pyramid or truncated cone-shaped operating portion having a slope and an upper bottom, and an end of the slope. A collar provided around the periphery of the first casing and the second casing constituting the measuring chamber, whereby the bladder membrane is fixed in the measuring chamber,
In the film-type gas meter, in which the upper bottom of the operating portion is sandwiched between the slats from both sides to prevent shape deformation at the time of measurement, a portion sandwiching the flange portion of the first casing and the second casing is , Extending until reaching the slope of the working part of the sac membrane, the boundary between the collar part of the sac membrane and the working part,
An intersecting portion formed between the first casing and the second casing to fix the sac membrane in the measuring chamber and to be formed at a boundary between the slope and the upper bottom of an operating portion of the sac membrane; However, the above-mentioned sac membrane is formed so as to be sandwiched between the sac plates.

[0014]

According to the membrane gas meter of the present invention, the radius formed at the boundary between the flange portion of the sac membrane and the operating portion located in the measuring chamber is formed by the first casing and the second casing. The round portion formed between the slope of the operating portion of the sac membrane and the upper bottom is further sandwiched between the sac plates attached to the upper bottom, and the sac membrane is fixed in the measuring chamber. Therefore, at the time of reciprocating operation for measuring the sac membrane, the radius portion generated at the time of forming the sac membrane does not affect the reciprocating operation of the sac membrane. As a result, the fluctuation of the driving torque in the reciprocating movement of the sac membrane is reduced, and the instrumental performance and sensitivity performance of the membrane gas meter become uniform.

[0015]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIGS. 1 (a) and 1 (b) show the configuration of an embodiment of a membrane gas meter according to the present invention. The same components as those of the conventional membrane gas meter described with reference to FIGS. The description is given with the same reference numerals.

In the present invention, the membrane gas meter also has the same components as the conventional membrane gas meter, and the configuration is the same as that described with reference to FIG. Therefore, the configuration of the membrane gas meter of the present invention will be described with reference to FIG. Also in the membrane gas meter of the present invention, the measuring chamber 5 is composed of the measuring chamber body 3 as the first casing and the membrane plate 4 as the second casing, and the measuring chamber 5 is provided in the measuring chamber body 3. The recess 30 is formed by overlapping the recess 30 of the membrane plate 4 attached to the measuring chamber body 3 with the recess 30. A diaphragm-shaped sac membrane 1 is sandwiched between the joints between the weighing chamber body 3 and the membrane plate 4, and the sac membrane 1 partitions the inside of the weighing chamber 5 into two chambers. The capsular membrane 1 has gas resistance, and reciprocates in the measuring chamber 5 in accordance with the gas flow rate, and the gas flow rate is measured by a measuring mechanism (not shown) by the number of reciprocating operations of the capsular membrane.

The concave portion 30 of the measuring chamber body 3 has a bottom surface 31 and a side surface 32, and the side surface 32 on the opening end side of the concave portion is tapered to open outward. Further, a rib receiving hole 34 for receiving a rib of the membrane 1 described later is provided in a joint surface 33 of the measuring chamber body 3 with the membrane plate 4, and a joint between the rib receiving hole 34 and the side surface 32 is provided. The surface 33 is stepped by the thickness of the alveolar film 1.

The membrane plate 4 has a concave portion 40 formed by a bottom surface 41 and a side surface 42, and a joining surface 43 provided over the entire area around the open end of the concave portion 40. It has an open taper shape. The length of the joint surface 43 of the membrane plate 4 with the measuring chamber body 3 is the same as the length of the joining surface 33 of the measuring chamber body 3.

The sac membrane 1 includes a flange 10 sandwiched between the measuring chamber body 3 and the membrane plate 4, and an operating section 2 reciprocating in the measuring chamber 5.
0, and is formed into a substantially quadrangular pyramid shape or a truncated cone shape using synthetic rubber as a main material so as to match the shape of the concave portion 30 of the measuring chamber body 3. In the embodiments described below, the sac membrane 1 having a substantially truncated pyramid shape will be described.

The collar 10 and the operating part 20 of the sac membrane 1
1 and the shapes of the measuring chamber body 3 and the membrane plate 4 in this embodiment will be described with reference to FIG.

As shown in FIG.
1 and a rib 12 formed on the end side of the flange 11.
The operation section 20 has a substantially truncated pyramid shape having a slope 21 and an upper bottom 22. Further, on both surfaces of the upper bottom 22, sac plates 2 for preventing a shape deformation at the time of reciprocating operation at the time of weighing of the operation unit 20 and keeping a weighing volume constant are attached. The edge of the sac 2 is slightly bent away from the joint surface. The structure of the sac 1 may be the same as the conventional sac.

On the other hand, in this embodiment, the measuring chamber body 3
The length L of the joining surface 33 that sandwiches the collar portion 10 of the capsular membrane 1
The slope 21 on the side of the substantially quadrangular pyramid-shaped operation part 20 of the capsular membrane 1
Is extended until it reaches. Similarly, the length M of the joint surface 43 of the membrane plate 4 that is superimposed on the joint surface 33 of the measuring chamber body 3 with the flange 10 interposed therebetween is substantially equal to the length L of the joint surface 33 of the measuring chamber body 3. It extends so as to reach the slope 21 on the side of the substantially quadrangular pyramid-shaped operation part 20 of the sac 1.

That is, the length of the inner dimension between the flanges 10 opposing each other across the operation part 20 of the sac membrane 1 is D1, and the length of the inner dimension of the joining surface 43 opposing the concave portion 40 of the membrane plate 4 is D1. Is D2, and D2 = D3, where D3 is the inner length of the joint surface 33 facing the recess 30 of the measuring chamber body 3.
The length L of the joining surface 33 of the measuring chamber body 3 and the length M of the joining surface 43 of the membrane plate 4 are set so that D2 <D1 and D3 <D1.

As a result, when the measuring chamber 5 is formed, FIG.
As shown in the figure, the boundary portion (R portion) 15 between the collar portion 10 of the capsular membrane 1 and the operating portion 20 is connected to the joining surface 33 of the measuring chamber body 3.
The bending point P at the time of reversal of the sac membrane 1 is interposed between the joint surface 43 of the sac membrane 1 and the slope 21 of the sac membrane 1 shown in FIG.
Is a predetermined portion. This P facing each other across the upper bottom 22
The inner length D4 of the points is the inner length D2 of the joint surface 43 facing the concave portion 40 of the membrane plate 4 and the inner length D2 of the joint surface 33 facing the concave portion 30 of the measuring chamber body 3. Is smaller than the length D3.

As described above, when the boundary portion 15 between the collar portion 10 of the sac membrane 1 and the operating portion 20 is sandwiched between the joining surface 33 of the measuring chamber body 3 and the joining surface 43 of the membrane plate 4, the sac membrane is formed. At the time of the reversing operation of No. 1, since there is no molding at the inflection point P, the driving torque is not fluctuated during the reciprocation of the sac 1 by the inflection point P, and the instrumental performance and sensitivity performance of the membrane gas meter are stabilized. .

In the embodiment described above, an example in which the same film as the conventional one is used has been described. However, in order to further reduce the fluctuation of the driving torque during the reciprocating movement of the film 1, the film is used. It is better to improve the film itself. This embodiment will be described with reference to FIG.

FIG. 2 (a) is an assembled sectional view showing the construction of an embodiment of the improved sac membrane 1 and the sac 2 used in the measuring chamber of the membrane gas meter of the present invention. In this embodiment, FIG.
As shown in (b), the upper base 2 of the conventional sac 1 shown by a dotted line.
The radius (curvature) of the boundary portion (round portion) 25 between the slope 2 and the slope 21 is increased as shown by a boundary portion 26 indicated by a solid line, and the central plane portion of the upper base 21 is reduced. That is, the length E of the center plane of the upper base 21 is made shorter than the length C of the plane part of the siding plate 2, and the boundary 26 between the new slope 21 and the upper base 22 becomes the flat surface of the siding plate 2. It is located in the plane of the part. As a result, when the membrane plate 2 is attached to the sac 1, the boundary 26 between the slope 21 and the upper bottom 22 of the sac 1 is obtained.
Is sandwiched between the plates 2 as shown in FIG. 2 (c).

As a result, the boundary (R) 26 between the slope 21 and the upper bottom 22 of the particularly strong sac 1 is sandwiched between the sac 2 and a predetermined point 27 on the slope 21 is sac. This is a bending point during the reciprocating operation of No. 1. Since the bending point 27 has a small force to return to the molded state, the fluctuation of the driving torque during the reciprocating movement of the sac 1 is reduced by this structure, the instrumental performance is stabilized, and the sensitivity performance is improved.

If the sac 1 having the structure shown in FIG. 2 is used in a membrane gas meter in which the joining surface 33 of the measuring chamber body 3 and the joining surface 43 of the membrane plate 4 described in FIG. The fluctuation of the driving torque during the reciprocating movement of the sac 1 is further reduced, the instrumental performance is further stabilized, and the sensitivity performance is further improved.
Although the present invention has been described with reference to the case where the sac membrane 1 has a truncated quadrangular pyramid shape, the present invention relates to the case where the sac membrane 1 has a truncated polygonal pyramid shape or a truncated cone shape. Can also be applied.

[0031]

As described above, according to the present invention,
In the reciprocating motion of the sac membrane in the membrane gas meter, fluctuations in the driving torque of the sac membrane are reduced, so that the instrumental performance is stabilized over a wide flow rate range, and the sensitivity performance is improved.

[Brief description of the drawings]

FIG. 1 (a) is a partially enlarged sectional view showing the structure of one embodiment of a joint portion between a sac membrane and a casing in a measuring chamber of a membrane gas meter of the present invention, and FIG. FIG. 5 is a partially enlarged cross-sectional view showing a state in which a sac membrane having a folded structure is attached to a casing of a measuring chamber.

2 (a) is an assembly sectional view showing the configuration of an embodiment of a sac and a sac used in a measuring chamber of a membrane gas meter according to the present invention, and FIG. (a) Explanatory drawing explaining the relationship between the sac and the sac, (c) is a cross-sectional view showing the sac with the sac attached to the sac of the structure of (a). is there.

3 (a) is a cross-sectional view for explaining the configuration of a measuring chamber and operation of a sac in a conventional membrane gas meter, and FIG. 3 (b) shows an attached state of a sac to a conventional sac. It is a partial expanded sectional view.

FIG. 4 is a partially enlarged perspective view showing a state in which a sac plate is attached to a conventional sac.

5A and 5B are diagrams for explaining a problem in the conventional membrane gas meter. FIG. 4A is a diagram for explaining a problem in a mounting portion of the sac membrane to the casing of the measuring chamber. FIG. 4 (b) is an enlarged sectional view showing a portion A, and FIG. 4 (b) is an enlarged sectional view showing a portion B of FIG. is there.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sac membrane 2 Sac plate 3 Measuring chamber body (1st casing) 4 Membrane board (2nd casing) 5 Measuring chamber 10 Flange part 11 Flange 12 Rib 15 Boundary part (R part) 20 Working part 21 Slope 22 Upper bottom 30 Concave portion 31 Bottom surface 32 Side surface 33 Joint surface 34 Rib receiving groove 40 Recess 41 Bottom surface 42 Side surface 43 Joint surface

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G01F 3/22 G01F 15/16

Claims (3)

(57) [Claims] 1. A gas-proof sac membrane is provided in a measuring chamber of a gas meter, and the sac membrane is reciprocated according to a gas flow rate.
A membrane gas meter for measuring a gas flow rate by the number of reciprocating movements of a sac membrane, wherein the sac membrane has a substantially pyramidal truncated pyramid or substantially frustoconical operating portion having a slope and an upper bottom, A flange provided around the end, and the collar is sandwiched between the first casing and the second casing constituting the measuring chamber, whereby the bladder membrane is fixed in the measuring chamber. In the membrane gas meter, a portion of the first casing and the second casing sandwiching the flange portion is extended until reaching a slope of an operating portion of the sac membrane, and the flange portion of the sac membrane and the operating portion are extended. A membrane gas meter characterized in that the boundary between the first casing and the second casing is sandwiched between the first casing and the second casing, and the membrane is fixed in the measuring chamber. 2. A gas-proof sac membrane is provided in a measuring chamber of a gas meter, and the sac membrane is reciprocated according to a gas flow rate.
A membrane gas meter for measuring a gas flow rate by the number of reciprocating movements of a sac membrane, wherein the sac membrane has a substantially pyramidal truncated pyramid or substantially frustoconical operating portion having a slope and an upper bottom, A flange provided around the end, and the collar is sandwiched between the first casing and the second casing constituting the measuring chamber, whereby the bladder membrane is fixed in the measuring chamber. In a membrane gas meter in which the upper bottom of the operating section is sandwiched between sac plates to prevent shape deformation at the time of measurement, a boundary between the slope and the upper bottom of the operating section of the sac membrane is provided. A film-type gas meter, wherein said film is formed so as to be sandwiched between said plates. 3. The membrane gas meter according to claim 2, wherein a portion of the first casing and the second casing, which sandwiches the flange portion, is extended until reaching a slope of an operating portion of the sac membrane. A membrane-type gas meter, characterized in that a boundary portion between a flange portion and an operating portion of the sac is sandwiched between the first casing and the second casing to fix the sac in the measuring chamber.