JPH07234144A - Membrane type gas meter - Google Patents

Abstract

PURPOSE:To display many kinds of abnormal contents to make large display possible and to facilitate assembling by eliminating wiring processing. CONSTITUTION:A permanent magnet 7 is attached to the front of a bladder membrane 6 and a controller chamber 11 is formed to the front of a lower case 3. A printed circuit board 13, a gas cut-off valve 15, a flow rate sensor 14, a pressure sensor 16, a seismoscope and a liquid crystal display device are received in the controller chamber 11 to be electrically connected. The flow rate sensor 14 is constituted of the lead switch mounted on the printed circuit board 13 and the operation of the bladder membrane 6 is detected on the basis of the movement of the permanent magnet.

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 having a safety function.

[0002]

2. Description of the Related Art A gas flow rate used is detected by an electric signal of a flow rate sensor (for example, a reed switch) for detecting the operation of a link mechanism of a gas meter, and a microcomputer indicates that a dangerous state deviates from a preset use condition. In Japanese Patent Application Laid-Open No. 61-8623, there is known a microcomputer meter that closes the gas shutoff valve to shut off the gas supply when it is dangerous.

In this gas meter, a membrane gas meter is composed of a lower case and an upper case, a controller chamber and a valve chamber are formed in the upper case, and a flow rate sensor, a controller, and an electromagnetic portion of a shutoff valve are formed in the controller chamber. It is provided. The light emitting diode is displayed so that the abnormal state can be seen from the outside.

[0004]

Recently, in order to display an abnormal state of a microcomputer meter, a liquid crystal display is desired in order to display a lot of information. In addition, there is a demand for a larger display, and from this point of view, display by liquid crystal is also desired. However, in the microcomputer meter in which the controller chamber and the valve chamber are formed in the upper case, there is a problem in that the size of the display part needs to be increased and the upper case must be enlarged, which inevitably increases the size of the gas meter. .

If only the controller with the display unit is arranged on the front surface of the lower case of the gas meter in an attempt to enlarge the display unit without enlarging the upper case, the controller chamber and the valve chamber are separated from each other, and the shut-off valve and the pressure sensor are separated. Since it is necessary to connect the controller with a lead wire, there is a problem in that reliability and assembly are difficult.

Therefore, an object of the present invention is to provide a membrane gas meter which can solve these problems.

[0007]

In order to achieve the above object, a first invention according to claim 1 is a microcomputer meter having a safety function, wherein a controller room is provided in front of a lower case (3). (11) is provided, and the controller room (11)
Printed circuit board as a controller (13)
A gas cutoff valve (15), a flow sensor (14) for detecting the operation of the sac, a pressure sensor (16) for detecting the gas pressure, and a seismoscope (17) for detecting the vibration of an earthquake. When,
The display unit (23) is housed therein.

According to a second aspect of the present invention, the rear wall of the controller chamber (11) according to the first aspect is provided with a lower case (3).
It is characterized in that it is formed by the abdominal plate (4) constituting the.

According to a third aspect of the present invention, the rear wall of the controller chamber (11) according to the first aspect is provided with a lower case (3).
It is characterized in that it is formed of a plate material (12b) different from the abdominal plate (4) constituting the.

According to a fourth aspect of the present invention, the flow sensor (14) according to any one of the first, second and third aspects is attached to a printed circuit board (13), and a permanent magnet is provided on the membrane (6). (7) is attached, and the permanent magnet (7) and the flow sensor (14) are opposed to each other with the abdominal plate (4) interposed therebetween.

[0011]

[Function] A printed circuit board (1
3) calculates the gas usage flow rate from the signal of the flow rate sensor (14), judges by the microcomputer that there is a dangerous state that deviates from the preset usage conditions, and in the event of danger, the gas cutoff valve (15) is turned on. Send a cutoff signal. Also, the pressure sensor (16)
The gas pressure abnormality is judged from the signal of (1), and the shutoff signal is sent to the gas shutoff valve (15) upon knowing the occurrence of the earthquake from the signal of the seismic sensor (17). Then, the content of the abnormality is displayed on the display unit (23).

The permanent magnet (7) attached to the capsule (6) actuates the flow sensor (14) in response to the back and forth movement of the capsule (6) to emit a flow signal. The controller (printed circuit board) (13) calculates the gas usage flow rate based on the flow rate signal.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the first embodiment of the present invention shown in FIGS. 1 to 5, a membrane gas meter is composed of an upper case 1 and a lower case 3, and a counter case in which a counter is built in the front surface of the upper case 1. 2 is attached. 2a is a counter display window. The lower case 3 includes a belly plate 4, a body plate 4a, and a back plate 4.
b. Reference numeral 5 is a membrane chamber into which the gas partitioned by the membrane 6 flows. 7 is a permanent magnet attached to the front surface of the membrane 6, 8 is an air supply / exhaust port (gas passage) provided in the lower case 3, 9 is a valve seat surrounding the air supply / exhaust port, and 10 is a gas seal portion.

Reference numeral 11 denotes a controller chamber, and as shown in FIGS. 1 and 2, a controller case 12 whose rear part is opened.
The rear side is fixed to the front surface of the abdominal plate 4 by a small screw or the like, and the controller case 12 and the abdominal plate 4 form a controller chamber 11. The controller case 12 includes a main body portion 12a, a controller cover 20, a terminal block cover 21, a return button cap 22, and a window 23 made of a transparent material.

A printed circuit board 13 as a controller is housed in the controller chamber 11 and is screwed to a plate-shaped column protruding from the abdominal plate 4. Electronic components such as a reed switch and a microcomputer serving as a flow rate sensor 14 for detecting the operation of the membrane 6 in response to the permanent magnet 7 are mounted on the printed circuit board 13. Further, in the controller chamber 11, a gas cutoff valve 15 and a pressure sensor 16 for detecting the pressure of gas are fixedly attached to the abdominal plate 4, and
7 are fixed to the printed circuit board 13 and housed therein, and these are electrically connected to the printed circuit board 13. The cutoff valve 15 is provided in the hole 4c by forming a hole 4c in the abdominal plate 4, and its mounting plate 15a is airtightly fixed to the abdominal plate 4 with a sealing material interposed.

Reference numeral 1a is a pressure introducing port for guiding the pressure of the gas flow path to the pressure sensor 1, which penetrates the abdominal plate 4 and communicates with the membrane chamber 5. Reference numeral 18 denotes a valve body of the gas cutoff valve 15, and when the gas cutoff valve 15 is activated by a cutoff signal from the printed circuit board 13 at the time of danger, the valve body 18 is pressed against the valve seat 9 by the force of the spring 18a to supply and exhaust the gas. (Gas passage) 8 is closed.
The gas shutoff valve 15 is a self-holding shutoff valve that holds the valve open state with a permanent magnet. When the one-shot signal from the printed circuit board 13 is applied to the exciting coil, the holding force of the permanent magnet temporarily weakens. A known shut-off valve that operates to close body 18.

Reference numeral 19 is a return button of the gas cutoff valve 15. The return button cap 22 is detachably provided on the front portion of the return button 19, and the return button cap 22 is removed to attach the return button 19. It can be operated manually.

On the front surface of the printed circuit board 13, a display unit 23 for displaying the contents of abnormality, for example, a display unit 23 made of liquid crystal
On the side of the controller cover 20 located in front of the display unit 23, a window 24 made of a transparent plate for visually recognizing the liquid crystal display unit 23 is provided.

In the first embodiment, the printed circuit board 13 as the controller calculates the gas usage flow rate from the signal from the flow rate sensor 14, and the microcomputer indicates that a dangerous state deviates from the preset usage conditions. Judge,
When there is a danger, a cutoff signal is sent to the gas cutoff valve 15, and the gas cutoff valve 15 closes the air supply / exhaust port 8. Also, the gas pressure abnormality is judged from the signal of the pressure sensor 1, the occurrence of an earthquake is known from the signal of the seismic sensor 17, and in these cases, a cutoff signal is sent to the gas cutoff valve 15 to supply and exhaust gas. Close mouth 8. Then, the abnormality content is displayed on the liquid crystal display unit 23.

The permanent magnet 7 attached to the capsular membrane operates the flow rate sensor 14 in response to the forward and backward movement of the capsular membrane to transmit a flow rate signal. The controller (printed circuit board) 13 calculates the gas usage flow rate based on the flow rate signal.

Next, a second embodiment of the present invention shown in FIGS. 8 to 8 will be described. In this embodiment, the controller chamber 11 in the first embodiment is formed of a plate material different from the abdominal plate 4 without using the abdominal plate 4 of the lower case 3.

In FIG. 8 to FIG. 8, reference numeral 12 denotes a controller case, which has a main body portion 12a similar to that of the first embodiment, a controller cover 20, a terminal block cover 21, a return button cap 22 and a window 23, and a peripheral wall and a front wall. And a rear wall 1 separate from the abdominal plate 4 of the lower case 3 at the rear of the main body 12a.
2b is integrally formed, and the controller case 12 forms a controller chamber 11.

Reference numeral 13 is a printed circuit board, 15 is a gas cutoff valve, 1 is a pressure sensor, and 17 is a vibration sensor, which have the same functions as those described in the first embodiment.
It is installed on the inner surface of the rear wall 12b of the controller case 12.

4c is a hole formed in the abdominal plate 4 as in the first embodiment, and the hole 12 is formed in the rear wall 12b in which the hole 4c is located.
c is formed. And the valve body 1 of the gas cutoff valve 15
8 is projected to the air supply / exhaust port 8 through both holes 4c and 12c, the gas cutoff valve 15 is arranged in the controller chamber 11, and the mounting plate 15a of the gas cutoff valve 15 is attached to the rear wall 12b with the sealing material 25. The airtightness is maintained between the gas circulation part such as the air supply / exhaust port 8 and the controller chamber 11 by interposing.
Also, between the rear wall 12b and the abdominal plate 4, both holes 12c, 4 are formed.
A sealing material 26 is located at the outer peripheral portion of c to maintain the airtightness between the inside of the lower case 3 and the outside.

The flow rate sensor 14 fixed to the printed circuit board 13 includes a permanent magnet 7 fixed to the front surface of the sac and a membrane.
The abdominal plate 4 and the rear wall 12b are arranged opposite to each other, and the functions of the flow rate sensor 14 and the permanent magnet 7 are the same as those in the first embodiment.

The pressure introducing port for introducing the pressure of the gas flow path to the pressure sensor 1 is the pressure introducing port 1a formed in the abdominal plate 4 and the rear wall 12.
It is formed by the pressure introduction port 1b formed in b. still,
The pressure inlet has a structure that is sealed from the outside.

Since the other structure is the same as that of the first embodiment, the same reference numerals are given to the same portions and the description thereof will be omitted. The operation of each component in the second embodiment is the same as that in the first embodiment.

[0028]

As described above, according to the first aspect of the invention, since the display section for displaying the abnormality content is provided in the wide area on the front surface of the lower case, the area of the display section can be widened. Not only is it possible to display various types of images on the display section, but the display itself is also large and easy to see. Moreover, the size of the gas meter itself does not exceed the maximum size of the related art despite the large display unit. Further, even if the display unit is provided in the front portion of the lower case as described above, the controller chamber for accommodating the printed circuit board and the like is also provided in the front portion of the lower case, so that wiring processing is almost unnecessary and the assembly is easy. became. Also, the reliability of electrical connection is improved.

According to the second aspect of the present invention, in addition to the above effects, since the abdominal plate of the lower case also serves as the rear wall of the controller chamber, the rear wall of the controller case is provided as compared with the case where the rear wall is independently provided. The length in the front-rear direction of the controller chamber can be shortened (thinned) or the volume can be increased accordingly. Furthermore, the gas cutoff valve can be directly attached to the abdominal plate to reduce the number of sealing points, and the unique rear wall can be eliminated to reduce the manufacturing cost.

According to the invention described in claim 3, in addition to the effect of the invention described in claim 1, there is a feature that the printed circuit board and the like can be unitized together with the controller case. According to the invention described in claim 4, since the flow rate can be detected by sensing the movement of the capsular membrane without wiring, the effect of the invention described in claim 1 can be further enhanced.

[Brief description of drawings]

1A and 1B show a first embodiment of the present invention, in which FIG. 1A is a side view with a part in section, and FIG. 1B is a side view with another part in section.

FIG. 2 is a front view of the embodiment of FIG. 1 with a controller cover and a terminal block cover removed.

FIG. 3 is a front view in which a part of the lower case of the embodiment of FIG. 1 is cut away.

FIG. 4 is a front view of the embodiment shown in FIG.

5 is a right side view of the embodiment of FIG.

FIG. 6 is a side view showing a second embodiment of the present invention, a part of which is a cross section.

FIG. 7 is a side view showing a cross section of another portion in the illustrated embodiment.

FIG. 8 is a front view showing a state in which a controller cover and a terminal block cover of the embodiment shown in the figure are removed.

[Explanation of symbols]

4 ... Abdominal plate, ... Sca, 7 ... Permanent magnet, 11 ... Controller chamber, 12 ... Controller case, 12b ... Rear wall 13
... Printed circuit board, 14 ... Flow rate sensor, 15 ... Gas cutoff valve, 1 ... Pressure sensor, 17 ... Vibration sensor, 23 ... Liquid crystal display section

Claims (4)

[Claims] 1. A microcomputer meter having a safety function, wherein a controller chamber is provided in a front portion of a lower case, and a printed circuit board as a controller, a gas cutoff valve, and an operation of a membrane are provided in the controller chamber. A membrane gas meter, comprising: a flow sensor for detecting a pressure, a pressure sensor for detecting a gas pressure, a seismoscope for detecting an earthquake vibration, and a display unit. 2. A membrane gas meter, wherein the rear wall of the controller chamber according to claim 1 is formed of an abdominal plate forming a lower case. 3. A membrane gas meter, characterized in that the rear wall of the controller chamber according to claim 1 is formed of a plate material different from the abdominal plate constituting the lower case. 4. The flow sensor according to claim 1, 2 or 3 is attached to a printed circuit board, a permanent magnet is attached to the membrane, and the permanent magnet and the flow sensor are separated from each other by a belly plate. Membrane-type gas meter characterized by being arranged facing each other.