CN111579006A - A non-magnetic sensor metering detection intelligent gas meter - Google Patents

Abstract

An intelligent gas meter without magnetic sensing, measuring and detecting is provided with a mechanical accumulator for measuring gas flow, a main driving wheel is arranged on the vertical surface of the driving shaft of the mechanical accumulator, the surface of the main driving wheel is divided into two parts by a straight line passing through the center of a circle to form two semicircles, wherein one semicircular surface material is metal, the other semicircular surface material is nonmetal, an inductor with a fixed space position is arranged on each semicircular surface, the gas meter further comprises a controller circuit, the controller circuit comprises a microprocessor and an A/D conversion module, a first LC circuit formed by connecting the first inductor in parallel with a first capacitor is connected to a first input port of the A/D conversion module, and a second LC circuit formed by connecting the second inductor in parallel with a second capacitor is connected to a second input port of the A/D conversion module.

Description

A non-magnetic sensor metering detection intelligent gas meter

technical field

The invention belongs to the technical field of digital energy control, and particularly relates to a non-magnetic sensor measurement and detection intelligent gas meter.

Background technique

In the existing household smart gas meter, the measurement data is mainly collected by using photoelectric or magnetic induction to convert the mechanical character wheel information into digital information, and display it on the LCD liquid crystal screen. However, in the actual use process, the photoelectric or magnetic induction technology will face the following main problems: (1) High cost. The cost of a photoelectric accumulator occupies almost 1/4 of the entire intelligent controller; (2) the anti-interference ability is weak. Photoelectric accumulators are sensitive to external strong light, while reed switches and Hall accumulators are sensitive to strong magnetic interference, and both reed switches and Hall accumulators are prone to errors when interference occurs.

SUMMARY OF THE INVENTION

The intelligent gas meter provided by the invention, aiming at the advantages of mechanical flow counting technology, abandons the use of photoelectric type, or reed switch, Hall accumulator, and solves the problem that photoelectric type, or dry reed switch, Hall accumulator is easy to make mistakes , to achieve a gas meter with strong anti-interference ability.

One of the embodiments of the present invention is a gas meter, the gas meter is provided with a mechanical accumulator for measuring gas flow, and a main drive wheel is provided on the vertical surface of the drive shaft of the mechanical accumulator,

The surface of the main drive wheel is divided into two by a straight line passing through the center of the circle, forming two semicircles, one of which is made of metal, and the other semi-circular surface is made of non-metal. inductances, i.e., the first inductance and the second inductance,

The gas meter also includes a controller circuit, which includes a microprocessor and an A/D conversion module, and a first LC circuit formed by connecting the first inductor in parallel with the first capacitor is connected to the first input of the A/D conversion module port, the second LC circuit formed by connecting the second inductor in parallel with the second capacitor is connected to the second input port of the A/D conversion module,

When the gas flow of the gas meter passes through, the main transmission wheel is pushed to drive the drive shaft of the mechanical accumulator to rotate. At the same time, the main transmission wheel rotates relative to the first and second inductances. The metal semicircle on the surface of the main transmission wheel and the The relative positions of the metal semicircle and the first inductance and the second inductance are alternately transformed. The microprocessor obtains the voltage signal output of the first LC circuit and the second LC circuit through the A/D conversion module, and judges the cumulative gas meter according to the signal change characteristics. flow.

The smart gas meter of the present invention realizes a new low-cost, high-reliability, anti-interference non-magnetic sensor metering data collection method, which can reduce the cost of the household smart gas meter and significantly improve the product operation process. reliability of data collection.

Description of drawings

The above and other objects, features and advantages of exemplary embodiments of the present invention will become readily understood by reading the following detailed description with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present invention are shown by way of example and not limitation, wherein:

FIG. 1 is a circuit schematic diagram of a gas meter and a controller according to one embodiment of the present invention.

FIG. 2 is a schematic diagram of the principle of changing the position of the main drive wheel and the inductance of the gas meter according to one embodiment of the present invention.

FIG. 3 is a schematic diagram of the principle of changing the position of the main drive wheel and the inductance of the gas meter according to one embodiment of the present invention.

Fig. 4 is a schematic diagram of the output change state of the two inductance signals of gas according to one embodiment of the present invention.

Among them, 1 - the main drive wheel, 2 - the drive shaft of the mechanical accumulator.

Detailed ways

According to one or more embodiments, as shown in FIG. 1 . An intelligent gas meter for non-magnetic sensing measurement and detection, the gas meter is provided with a mechanical accumulator for gas flow measurement, and a main drive wheel is provided on the vertical surface of the drive shaft of the mechanical accumulator.

As shown in Figure 2 and Figure 3, the surface of the main drive wheel is divided into two by a straight line passing through the center of the circle to form two semicircles, one of which is made of metal and the other of which is non-metal. Inductors with fixed spatial positions, namely, a first inductance and a second inductance are disposed on each semicircular surface.

As shown in FIG. 1 , the gas meter further includes a controller circuit, which includes a microprocessor and an A/D conversion module, and a first LC circuit formed by connecting the first inductor in parallel with the first capacitor is connected to the A/D conversion module The first input port of the A/D conversion module, the second LC circuit formed by connecting the second inductor in parallel with the second capacitor is connected to the second input port of the A/D conversion module,

When the gas flow of the gas meter passes through, the main transmission wheel is pushed to drive the drive shaft of the mechanical accumulator to rotate. At the same time, the main transmission wheel rotates relative to the first and second inductances. The metal semicircle on the surface of the main transmission wheel and the The relative positions of the metal semicircle and the first inductance and the second inductance are alternately transformed. The microprocessor obtains the voltage signal output of the first LC circuit and the second LC circuit through the A/D conversion module, and judges the cumulative gas meter according to the signal change characteristics. flow.

According to one or more embodiments, as shown in FIG. 1 . The controller circuit of the gas meter also includes a wireless communication module, a Flash storage module, a key module, a power management module, and an LCD display module. The microprocessor adopts the MCU module, and integrates two ADC sampling modules with high precision and low power consumption, which are used for collecting accumulator measurement data and data processing and storage. The wireless communication module is used for wireless communication with the management system according to the embedded network communication protocol. The flash card module is used to store historical records, alarm information and configuration information of smart meters. The power management module is used to supply power to each module.

Further, the LCD display module is used to display various types of alarm prompts, alarm thresholds, real-time data of pressure and temperature, meter time and other information. The button module is used for human-computer interaction and information query and configuration; the MCU module is used to coordinate and control each module.

According to one or more embodiments, the surface of the main transmission wheel of the gas meter is divided into two by a straight line passing through the center of the circle, forming two semicircles. One of the semicircular surfaces is made of metal plate, and the other semicircular surface is made of plastic. There are two LC oscillation modules on the circuit board of the gas meter controller, and the voltage across the capacitor of the LC oscillation circuit is regularly sampled by the ADC sampling module with high precision and low power consumption. After the capacitor is charged, the change curve of the voltage difference between the two ends is a sine wave that gradually decays under normal circumstances. The two LC oscillator modules are arranged horizontally, facing the side of the main drive wheel of the accumulator. After the gas meter is ventilated, it will drive the main drive wheel of the accumulator to rotate. When the metal side of the drive wheel faces the LC oscillation module, because the inductive coil is in the metal area, an inductive eddy current will be formed, resulting in greater power consumption and sine wave attenuation. faster. When the surface of the plastic area of the driving wheel faces the LC oscillation module, the inductance coil is in the non-metallic area, there is basically no eddy current, and the decay speed of the sine wave is relatively slow. Detecting the decay speed of the sine wave through the MCU can accurately identify which area the dial rotor is in, and then judge the dial position and the number of turns, so as to achieve the purpose of gas meter ventilation measurement. As shown in Figure 4.

It is worth noting that although the foregoing content has described the spirit and principle of the present invention with reference to several specific embodiments, it should be understood that the present invention is not limited to the disclosed specific embodiments, and the division of various aspects does not mean that these Features in aspects cannot be combined, this division is for convenience of presentation only. The invention is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims (4)

1. A non-magnetic sensor measurement detection intelligent gas meter, the gas meter is provided with a mechanical accumulator for gas flow measurement, and a main drive wheel is provided on the vertical surface of the drive shaft of the mechanical accumulator, which is characterized by, The surface of the main drive wheel is divided into two by a straight line passing through the center of the circle, forming two semicircles, one of which is made of metal, and the other semi-circular surface is made of non-metal. inductances, i.e., the first inductance and the second inductance, The gas meter also includes a controller circuit, which includes a microprocessor and an A/D conversion module, and a first LC circuit formed by connecting the first inductor in parallel with the first capacitor is connected to the first input of the A/D conversion module port, the second LC circuit formed by connecting the second inductor in parallel with the second capacitor is connected to the second input port of the A/D conversion module, When the gas flow of the gas meter passes through, the main transmission wheel is pushed to drive the drive shaft of the mechanical accumulator to rotate. At the same time, the main transmission wheel rotates relative to the first and second inductances. The metal semicircle on the surface of the main transmission wheel and the The relative positions of the metal semicircle and the first inductance and the second inductance are alternately transformed. The microprocessor obtains the voltage signal output of the first LC circuit and the second LC circuit through the A/D conversion module, and judges the cumulative gas meter according to the signal change characteristics. flow. 2 . The gas meter according to claim 1 , wherein the controller circuit of the gas meter further comprises a wireless communication module, a Flash memory module, a button module, a power management module, and an LCD display module. 3 . 3. The gas meter according to claim 1, wherein the microprocessor calculates the number of revolutions of the mechanical accumulator of the gas meter according to the signal change characteristics of the first LC circuit and the second LC circuit, Get the flow count of the gas meter. 4 . The gas meter according to claim 1 , wherein the microprocessor determines the flow in and out directions of the gas meter according to the signal change characteristics of the first LC circuit and the second LC circuit. 5 .

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