JPH02213722A - Turbine type gas meter - Google Patents

Abstract

PURPOSE:To decrease circuit parts and to reduce the size over the entire part of the circuits so that the gas meter small in size as a meter is obtd. by integrating an amplifier circuit, counter and main control section, etc., to the integrated circuit of one chip. CONSTITUTION:The integrated circuit 15 is constituted by forming an input/ output port 9, a liquid crystal driving circuit 5 connected to a liquid crystal display device 16, communicating I/O 6, 7 which are the serial ports of the gas meter for communication with the outside, the main control section 4 consisting of a microcomputer, and a power source circuit 8 on the same wafer. The input/output port 9 is connected to the analog amplifier circuit 2 which amplifies the signals from a revolution detector 14 and converts the same to pulse signals, a counter 3 which counts the pulse signals from the circuit 2, a resetting/breaking switch 10, an input circuit 11, such as pressure sensor, a shutoff valve driving circuit 12, and a selector valve driving circuit 13. The main control section 4 is connected to the circuits 2, 5, the counter 3, the I/O 6, 7, and the port 9 by an internal bus line. The power source circuit 8 stabilizes the voltage from a battery 1 and supplies the same to the counter 3, the control section 4, and the I/O 6, 7.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a turbine gas meter.

[Prior art]

In conventional turbine gas meters, the rotation of the impeller is detected by a magnetic sensor and converted into an electrical signal, which is then converted into a pulse signal by an amplifier circuit or comparator circuit, and this pulse signal is input into a microcomputer to perform the instrumentation. Arithmetic processing such as difference correction was performed, and the results were output as a unit flow rate pulse signal. This unit flow rate pulse signal is then input to another microcomputer, which determines whether there is an abnormality in the gas flow rate based on the amount of gas passing through the meter.
If it was determined that there was an abnormality, a cutoff signal was output to close the cutoff valve in the gas flow path.

Further, the flow rate was also integrated by the latter microcomputer, and the integrated value was displayed on a liquid crystal display.

[Problems to be solved by the present invention]

In conventional turbine gas meters, the electronic circuit section is divided into an amplifier circuit, two microcomputers, a shutoff valve drive circuit, etc., and not only do they require many circuits, but also
There was also a problem in that the current consumption was large. Further, there is a problem that many ink-face circuits are required to connect each circuit, the number of parts increases, and miniaturization is not possible.

Recently, there has been a demand for gas meters in terms of building fit (size, freedom of installation location, aesthetics, etc.) and ease of response to the electronic information society (safety systems, automatic meter reading systems, remote metering, etc.). is extremely strong, and there is a strong demand for the realization of a small, electronic household gas meter.

In view of the above, it is an object of the present invention to solve the above-mentioned problems and to propose an electronic turbine-type gas meter that is compact and adaptable to an increasingly sentimental society.

[Means to solve the problem]

In order to achieve the above object, the turbine gas meter of the present invention includes an impeller that is rotatably provided in a gas flow path together with a rotating shaft, a rotation detector 14 that detects the rotation of the impeller, and a rotation detector 14 that detects the rotation of the impeller. A shutoff valve provided in the passage to shut off the flow path, a shutoff valve drive circuit 12 that opens and closes the shutoff valve, a switching valve that switches the flow path to the impeller, and a switching valve drive circuit that operates the switching valve. 13, a pressure sensor for detecting the pressure in the flow path, a seismic sensor for detecting earthquakes, a pressure sensor input circuit 11 for inputting signals from these pressure sensors and the seismic sensor, and a circuit for inputting the shutoff valve. It consists of a return/cutoff switch 10 for instructing opening/closing, a battery 1 as a power source, a liquid crystal display 16, and an integrated circuit 15, which receives the signal from the rotation detector 14. An analog amplifier circuit 2 that amplifies and converts it into a pulse signal, a counter 3 that counts the pulse signal from the amplifier circuit 2, the return/cutoff switch 10, and an input circuit 11 such as a pressure sensor.
an input/output port 9 connected to the cutoff valve drive circuit 12 and the switching valve drive circuit 13; a liquid crystal drive circuit 5 connected to the liquid crystal display 16; and a serial port for communicating with the outside of the gas meter. communications 1106, 7, the amplifier circuit 2, the counter 3, the liquid crystal drive circuit 5, and the communications 1106,
7, an input/output port 9, and a main control unit 4 consisting of a microcomputer connected by an internal bus line, and the battery (1).
) and communicates with the counter 3 and the main control unit 4 1106. ．． 7 are formed on the same wafer, and the main control section 4 is equipped with the following program.

(stomach) (B) (c) (d) (E) Record The amplifier circuit 2 is operated intermittently.

The contents of the counter 3 are read out periodically, and the result of integrating the amount of change is displayed on the liquid crystal display 16 via the liquid crystal drive circuit 5.

Read out the contents of counter 3 and The flow rate is calculated and the flow rate is stored in advance. compare it to the current value to determine whether it is abnormal. input port 9 according to the judgment result. A control signal is output to the shutoff valve drive circuit 12 through the shutoff valve drive circuit 12.

The flow rate is calculated and determined in the same way as in the previous section, and a control signal is output to the switching valve drive circuit through the input/output port 9 according to the determination result.

When the state of the shutoff valve is closed when the signal from the return/shutoff switch 10 is input through the input/output port, a control signal to open the shutoff valve is sent to the shutoff valve. Output to the drive circuit 12.

(f) Judgment and processing the signals from the pressure sensor and seismic sensor.

〔Example〕

A block diagram of the embodiment is shown in FIG. In the drawing, 1 is a battery as a power source, and 2 is an amplifier circuit, which is an analog circuit. 3 is a counter, and 4 is a main control circuit consisting of a microcomputer, which is equipped with a ROM and a RAM.
5 is a liquid crystal drive circuit; 6 and 7 are each an independent serial port for communication I10; 8 is a device that stabilizes the voltage from the battery 1 and communicates with the counter 3 and the main control unit 4;
6 and 7, 9 is an input/output port, and the main control circuit 4 is connected to the amplifier circuit 2, counter 3, liquid crystal drive circuit 5, communications 1106, 7, and input/output port 9 through an internal bus line. has been done.

The amplification circuit 2 to input/output port 9 are formed on the same wafer together with the internal bus line as a l-chip integrated circuit 15. The amplifier circuit 2 is an analog circuit, and is formed as a one-chip integrated circuit together with other digital circuits.

10 is a return for opening and closing a shutoff valve (not shown);
It is a cut-off switch and consists of a push button switch. 11 is an input circuit such as a pressure switch that detects the pressure in a flow path (not shown) and a pressure sensor that inputs signals from a seismic sensor (also not shown) and transmits them to the input/output port; 12 is a cutoff (not shown); 13 is a switching valve drive circuit that operates a switching valve (not shown); 14 is a rotation detector that detects the rotation of an impeller (not shown); and 16 is a liquid crystal display (not shown). Connected like.

The switching valve is installed in the flow path at a position for switching whether or not to block the flow in the axial direction of the impeller.

Further, a nozzle-shaped hole is provided to provide a flow in a tangential direction to the impeller in the flow path.

Next, the operation of the embodiment shown in the drawings will be explained.

When gas flows through the gas meter, an impeller (not shown) rotates, and the signal from the rotation detector 14 is converted into a pulse signal by the amplifier circuit 2 and input to the counter 3. The amplifier circuit 2 is connected to the main control circuit 4 through an internal bus line, and operates intermittently according to the program of the main control section 4, thereby reducing power consumption. The output of the counter 3 is connected to the main control section 4 through an internal bus line, and the contents of the counter 3 can be periodically read out by the program of the main control section 4 to know changes in the input pulse.

The contents of the counter 3 are periodically read out and the amount of change thereof is integrated, and the result is displayed on the liquid crystal display 16 via the liquid crystal drive circuit 5 under control from the main control section 4. In addition, the main control unit 4 calculates and determines the flow rate, and through the input/output port 9,
Signals are output to the switching valve drive circuit 13 and the cutoff valve drive circuit 12 to drive the respective valves. For example, when the flow rate exceeds a specified value and the rotational force of the impeller is obtained by the flow in the axial direction, the switching valve is opened to guide most of the flow rate in the axial direction. Conversely, if the flow rate falls below the specified value and sufficient rotational force cannot be obtained for the impeller due to the flow in the axial direction, the switching valve is closed to interrupt the flow in the axial direction. At this time, all the gas passes through the nozzle-shaped holes and flows tangentially to the impeller, providing rotational force for the impeller.
In this way, by controlling the flow in the axial direction with the switching valve, the flow rate measurement range can be expanded compared to when the flow direction is fixed to either the axial direction or the tangential flow direction. When the flow rate reaches an abnormal value exceeding a relatively large constant value, a shutoff valve is activated to shut off the gas.

Signals from a pressure sensor and a seismic device (not shown) are input to a pressure sensor input circuit 11, and then enter the main control unit through an input/output port 9 for determination processing.

A signal from the return/cutoff switch 10 also enters the main control section 4 through the input/output port 9. When this switch 10 is pressed while the cutoff valve is in the closed state, an open signal is issued to the cutoff valve (not shown), and the valve opens. When this switch IO is pressed while the cutoff valve is in the open state, a close signal is output and the valve is closed.

The voltage from the lithium battery 1 is measured by a counter 3 and a main control unit 4.
and communication 1106.7 are stabilized and supplied by the power supply circuit 8 to reduce power consumption and enable stable operation without being affected by peripheral circuits. Note that voltage is directly supplied from the battery 1 to other circuits.

Communication 1106.7 performs an input operation for receiving signals from the outside and an output operation for transmitting signals to the outside. The signals transmitted are meter readings and security information, and are compatible with remote and automatic meter reading. Also, when an abnormality is detected in the gas usage status, the meter makes a terminal call and reports the abnormality to the outside.

The liquid crystal display 16 also has a function of distinguishing and displaying an event that shuts off a shutoff valve (not shown), and a pilot display function of indicating whether gas is flowing.

〔Effect of the invention〕

Since the amplifier circuit, counter, main control unit, etc. are integrated into a single chip integrated circuit, the number of circuit parts is small, the entire circuit is compact, and a turbine-type gas meter that is also compact can be realized.

Furthermore, since most of the circuits are integrated on one wafer, power consumption can be reduced, and since wiring patterns do not have to be routed on a printed wiring board, noise can be prevented from entering.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention. l...Battery, 2...Amplification circuit, 3...Counter,
4... Main control unit (microcomputer), 5...
Liquid crystal drive circuit, 6.7 communication I10.8...power supply circuit,
9... Input/output port, 10... Return/cutoff switch, 11... Pressure sensor etc. input circuit, 12... Shutoff valve drive circuit, 13... Shutoff valve memory circuit, 14...
Rotation detector, 15...Integrated circuit, 16...Liquid crystal display patent expert Aichi Watch Electric Co., Ltd.

Claims (1)

[Scope of Claims] An impeller provided in a gas flow path so as to be rotatable together with a rotating shaft, a rotation detector (14) that detects the rotation of the impeller, and a rotation detector (14) provided in the gas flow path to detect the rotation of the impeller. a cutoff valve to shut off, a cutoff valve drive circuit (12) to open and close the cutoff valve, a switching valve to switch the flow path to the impeller, a switching valve drive circuit (13) to operate the switching valve; A pressure sensor that detects the pressure in the flow path, a seismic sensor that detects earthquakes, a pressure sensor input circuit (11) that inputs signals from these pressure sensors and the seismic sensor, and an input circuit (11) that controls the opening and closing of the shutoff valve. return to direct,
A dual-purpose switch (10) and a battery (1) as a power source
, a liquid crystal display (16), and one integrated circuit (15), and the integrated circuit (15) is connected to the rotation detector (1
4), an analog amplifier circuit (2) that amplifies the signal from the amplifier circuit (2) and converts it into a pulse signal, a counter (3) that counts the pulse signal from the amplifier circuit (2), and the return/cutoff switch (10). ), the input/output port (9) connected to the pressure sensor input circuit (11), the cutoff valve drive circuit (12), the switching valve drive circuit (13), and the liquid crystal display (16).
) connected to the LCD drive circuit (5) and the communication I/O (5), which is a serial port for communicating with the outside of the gas meter.
6), (7), the amplifier circuit (2) and the counter (3)
and a main control unit (4) consisting of a microcomputer connected to the liquid crystal drive circuit (5), communication I/O (6), (7), input/output port (9), and an internal bus line, and the battery (
A power supply circuit (8) that stabilizes the voltage from 1) and supplies it to the counter (3), main control unit (4), and communication I/O (6) and (7) is formed on the same wafer. A turbine type gas meter, wherein the main control section (4) is provided with the following program. (a) The amplifier circuit (2) is operated intermittently. (b) The contents of the counter (3) are read out periodically, and the result of integrating the amount of change is displayed on the liquid crystal display (16) via the liquid crystal drive circuit (5). (c) Read the contents of the counter (3), calculate the gas flow rate, compare the flow rate with a pre-stored value to determine whether it is abnormal, and depending on the determination result, move the input port (9)
A control signal is output to the shutoff valve drive circuit (12) through the shutoff valve drive circuit (12). (d) Calculate and determine the flow rate in the same manner as in the previous section, and output a control signal to the switching valve drive circuit through the input/output port (9) according to the determination result. (e) When the signal from the return/cutoff switch (10) is input through the input/output port, when the shutoff valve is in the closed state, a control signal is sent to open the shutoff valve, and when it is open, the shutoff valve is closed. A control signal is output to the shutoff valve drive circuit (12). (f) Judgment processing of signals from the pressure sensor and seismic sensor.