JP3066153B2 - 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, and more particularly to an improvement of a membrane gas meter provided with a controller using a microcomputer.

[0002]

2. Description of the Related Art The membrane movement of a membrane gas meter is converted into an electric signal, and the flow rate of the gas is calculated by a microcomputer from the electric signal. Microcomputer meters are well known.

FIGS. 4 and 5 show the structure of a membrane gas meter of this kind. 1 and 2 are sac membranes which are sandwiched between membrane plates from both front and rear sides, respectively, and together with a lower case 13 together with a front abdominal plate 3 and a rear abdominal plate 4, constitute weighing chambers 5, 6, 7, and 8.

[0004] Reference numeral 9 denotes a magnet mounted on a membrane plate in contact with the front side of the sac membrane 1. 10 is the upper case and entrance 1
1 and an outlet 12. Reference numeral 13 denotes a lower case, which is hermetically fixed to a lower portion of the upper case 10 with a packing (not shown) sandwiching a packing 14 therebetween.

Reference numeral 15 denotes a counter for displaying the amount of gas used, 1
Reference numeral 6 denotes a counter cover which is airtightly fixed to the upper case 10 via a packing 17, and a lower portion thereof is vertically extended downward, and a controller case 18 is integrally formed.

[0006] The controller case 18 includes the front abdominal plate 3.
And is formed in a box shape opened forward. Reference numeral 19 denotes a circuit board (controller) on which electronic components such as a microcomputer and a contact element 20 are mounted, which is mounted in the controller case 18.

When the sac membrane 1 moves back and forth with the gas flowing, the magnet 9 reciprocates back and forth with the sac membrane and the membrane plate.
The contact of the contact element 20 is turned on by the magnetic field of the magnet.
Turn off to generate an electrical signal corresponding to the flow rate.

The microcomputer calculates the flow rate from the electric signal, and closes the shut-off valve built in the meter when the flow rate is abnormal. Reference numeral 21 denotes a terminal block provided below the circuit board (controller) 19, and reference numeral 22 denotes terminals, which are accommodated in the controller case 18.

Reference numeral 23 denotes a terminal cover which covers the front of the circuit board (controller) 19, and is fixed to the front part of the controller cover 18 in a gas-tight manner via packing through screws.

[0010] A gap 25 is provided between the front abdominal plate 3 and the controller case 18 so that they do not interfere with each other.

[0011]

In the above prior art,
A controller case 18 for accommodating a circuit board (controller) 19 and a terminal block 21 is formed by extending the counter cover 16 downward so as to extend downward. Is arranged, the thickness before and after the gas meter becomes large, the meter becomes large and the material cost becomes high,
There was a problem that it took time to assemble.

Accordingly, an object of the present invention is to provide a new structure of a film-type gas meter which can solve such a problem.

[0013]

In order to achieve the above object, a membrane gas meter according to the present invention comprises an outer periphery of a front abdominal plate (3) adjacent to a sac (1) to which a magnet (9) is attached. A ridge (3a) was formed over the entire area, and a controller case (18) was constituted by the front abdominal plate (3).

It is preferable to cover the front surface of the controller case (18) with a controller cover (23) and provide a controller room (26) between the two. Further, a contact element (20) responsive to the magnetic field of the magnet (9) may be provided in the controller room (26).

[0015]

[Function] The front abdominal plate (3) is the controller case (18)
, The gap (25) as in the prior art is eliminated, and the meter becomes compact. Further, since the distance between the magnet (9) and the contact element (20) is reduced, the positioning of the contact element may be rough, and the operation of the contact element is ensured.

[0016]

FIG. 4 and FIG. 5 in the embodiment of FIGS.
The parts having the same reference numerals and having the same performance as those of the components described in the related art will be omitted if the description is unnecessary.

1 to 3, a front abdominal plate 3 adjacent to a sac 1 to which a magnet 9 is attached is integrally formed with a fin 3a projecting forward over the entire outer peripheral portion thereof, and is integrally formed with a controller case. 18.

Reference numeral 3b denotes two pillars protruding from the front abdominal plate 3 for mounting a circuit board (controller) 19. The circuit board (controller) 1 is screwed onto the pillar 3b.
9 is mounted and covered with the controller cover 23. 2
4 is a terminal cover.

A contact element 20 such as a reed switch mounted on a circuit board (controller) 19 is turned on and off by a magnet 9 reciprocating back and forth together with the sac 1 to generate a flow signal having a cycle corresponding to the flow rate. .

The microcomputer of the circuit board (controller) 19 determines whether or not the flow rate is abnormal based on the flow rate signal. When the flow rate is abnormal, the microcomputer closes the well-known shut-off valve 27 (FIG. 1) to stop gas supply.

Reference numeral 26 denotes a controller room formed between the controller case 18 and the controller cover 23.

[0022]

Since the membrane gas meter of the present invention is constructed as described above, the counter cover may be of the same small size as a normal gas meter having no controller, and the controller case may be provided without the gap 25. Since the front abdominal plate can be integrally formed, the thickness of the meter in the front-rear direction is reduced, and the meter can be made more compact.

Further, the distance between the magnet and the contact element was reduced at least by the elimination of the gap 25, and the positioning of the contact element was accurate and the operation was reliable.

Further, since the meter is made compact, the material cost can be reduced, and the structure is simplified and the assembly becomes easy.

[Brief description of the drawings]

1 is a side sectional view of an embodiment of the present invention, and is a sectional view taken along line AA of FIG. 2;

FIG. 2 is a front sectional view of the embodiment of the present invention.

FIG. 3 is a schematic view of a main part of FIG. 1;

FIG. 4 is a front sectional view of a conventional technique.

FIG. 5 is a sectional view taken along line BB of FIG. 4;

[Explanation of symbols]

 3 Front abdominal plate 3a Proposal 9 Magnet 18 Controller case 20 Contact element 23 Controller cover 26 Controller room

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G01F 3/22 G01F 15/16

Claims (3)

(57) [Claims] An abutment (3a) is formed over the entire outer periphery of a front abdominal plate (3) adjacent to a sac (1) to which a magnet (9) is attached, and is formed by the front abdominal plate (3). A membrane gas meter comprising a controller case (18). 2. The membrane gas meter according to claim 1, wherein the controller case is covered with a controller cover, and a controller chamber is provided between the two. 3. The gas meter according to claim 1, further comprising a contact element (20) responsive to a magnetic field of the magnet (9) in the controller room (26).