CN114623885A

CN114623885A - Non-magnetic metering system and metering method thereof

Info

Publication number: CN114623885A
Application number: CN202011446147.5A
Authority: CN
Inventors: 肖德银; 赵永刚; 吴克兵; 廖伟军
Original assignee: Nationz Technologies Inc
Current assignee: Nationz Technologies Inc
Priority date: 2020-12-11
Filing date: 2020-12-11
Publication date: 2022-06-14

Abstract

The application provides a non-magnetic metering system and a metering method thereof. The non-magnetic metering system comprises a disc, an oscillating unit and a processor, wherein the disc horizontally rotates under the driving of a fluid to be measured, and comprises a metal area and a non-metal area; the oscillating unit comprises two LC oscillating circuits which generate two LC oscillating signals; the processor is connected with the oscillation unit, when the metal area and the nonmetal area of the disc are close to the LC oscillation circuit, the amplitude of LC oscillation signals changes, different voltage amplitudes are generated, the positions of the metal area and the nonmetal area are recorded to determine the revolution number of the disc, and the flow information of the fluid to be measured is determined based on the revolution number of the disc from the oscillation unit.

Description

Non-magnetic metering system and metering method thereof

Technical Field

The application relates to the technical field of fluid metering, in particular to a non-magnetic metering system and a metering method thereof.

Background

The following water meters are available on the market: pulse accumulation type, image pickup type, and photoelectric type.

The pulse accumulating water meter is generally to sample by reed pipe or Hall element, then to convert the pulse number into water consumption in the calculator and store it in the CPU memory, and to read the data of the memory directly, and the disadvantage is that the reed pipe sampling element has short service life and is easy to damage, and the metering is easy to be inaccurate under the vibration of external magnetic field or pipeline.

The camera type water meter is characterized in that a camera is additionally arranged on a water meter display window, the defects are obvious, expensive electronic hardware is needed for analyzing images, the software processing power consumption is too large, and the overall cost is too high.

The photoelectric meter adopts the mode that the direct-reading photoelectric module is placed in a liquid seal character wheel box of the water meter, and the liquid seal character wheel box is filled with non-conductive liquid such as transformer oil, purified water or glycerin, and the like, so that the work is normal, but as time goes on, tap water can permeate to enable the photoelectric module to lose effect due to short circuit and the like.

Disclosure of Invention

The embodiment of the application provides a non-magnetic metering system, which comprises a disc, an oscillation unit and a processor, wherein the disc horizontally rotates under the driving of a fluid to be measured, and comprises a metal area and a non-metal area; the oscillating unit comprises two LC oscillating circuits which generate two LC oscillating signals; the processor is connected with the oscillation unit, when the metal area and the nonmetal area of the disc are close to the LC oscillation circuit, the amplitude of LC oscillation signals changes, different voltage amplitudes are generated, the positions of the metal area and the nonmetal area are recorded to determine the revolution number of the disc, and the flow information of the fluid to be measured is determined based on the revolution number of the disc from the oscillation unit.

According to some embodiments, the area ratio of the metallic region to the non-metallic region is 1: 1.

according to some embodiments, the processor comprises a comparator module, a pulse counting module, an encoder module and a rotation counting module, wherein the comparator module is connected with the oscillation unit, compares the voltage amplitude generated by magnetic induction linear cutting of each path of LC oscillation signal by a metal area or a non-metal area of the disc with a preset voltage, and outputs two paths of pulse signals; the pulse counting module is connected with the output end of the comparator module and counts the number of the pulse signals of each path; the encoder module is connected with the pulse counting module, compares the number of the pulse signals of each path with a pulse number threshold value, determines that the LC oscillating circuit of each path measures a metal area or a non-metal area of the disc, encodes the inductance state of the oscillating circuit, and outputs the code to the rotation counting module; the rotation counting module records the sequence of the inductance state combination coding of the oscillating circuit and the cycle number, so as to judge the rotation angle and direction information of the disc and measure the revolution of the disc.

According to some embodiments, the processor further includes a charging circuit and a digital-to-analog conversion circuit, wherein the charging circuit is connected to the oscillation unit and charges the two LC oscillation circuits in an interval periodic manner; the digital-to-analog conversion circuit is connected with the comparator module and used for setting the preset voltage.

According to some embodiments, the LC oscillating circuit oscillates at a frequency between 100KHz and 50 MHz.

According to some embodiments, the processor further comprises a communication module, wherein the communication module is in remote communication with the management terminal and uploads the flow information of the fluid to be tested.

The embodiment of the present application further provides a metering method of the foregoing nonmagnetic metering system, including: detecting the number of revolutions of the horizontally rotating disk driven by the fluid to be measured by using an LC oscillation signal from the oscillation unit; and determining the flow information of the fluid to be measured based on the rotation number of the disc.

According to some embodiments, said detecting the number of revolutions of said fluid-driven horizontally rotating disc to be tested using LC oscillation signals from said oscillation unit comprises: receiving two LC oscillation signals from the oscillation unit; comparing the voltage amplitude of each path of LC oscillation signal with a preset voltage, and outputting two paths of pulse signals; counting the number of each path of pulse signals; comparing the number of the pulse signals of each path with a pulse number threshold value, determining that the LC oscillating circuit of each path measures a metal area or a non-metal area of the disc, and encoding the inductance state of the oscillating circuit; and recording the sequence of the inductance state combination codes of the oscillation circuit and the cycle number, thereby judging the rotation angle and direction information of the disc and measuring the rotation number of the disc.

According to some embodiments, the comparing the voltage amplitude of each of the LC oscillating signals with a preset voltage to output two pulse signals includes: and when the voltage amplitude of each path of LC oscillation signal is greater than the preset voltage, outputting the pulse signal.

According to some embodiments, said comparing the number of said pulse signals per path with a pulse number threshold to determine whether said LC tank circuit measures a metallic or non-metallic region of said disk comprises: the number of the pulse signals is larger than a first pulse number threshold value, and the fact that the LC oscillating circuit measures the non-metal area of the disc is determined; and determining that the metal area of the disc is measured by the LC oscillating circuit when the number of the pulse signals is less than a second pulse number threshold value.

According to the technical scheme, passive devices such as inductance and capacitance are adopted to build the nonmagnetic metering system, the cost is low, the detection precision is high, the power consumption is low, and the robustness is strong.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a functional block diagram of a nonmagnetic metering system according to an embodiment of the present application.

Fig. 2 is a second functional block diagram of a nonmagnetic metering system according to an embodiment of the present application.

Fig. 3 is a schematic flow chart illustrating a metering method of a nonmagnetic metering system according to an embodiment of the present application.

Fig. 4 is a schematic flow chart of measuring the number of revolutions of a disk according to an embodiment of the present application.

Fig. 5A-5D illustrate a metal region and a non-metal region 1 according to an embodiment of the present disclosure: 1, a pulse signal counting state diagram of one circle of a disc of the disc.

Fig. 6A-6D illustrate a metal region and a non-metal region 1 according to an embodiment of the present disclosure: 3, a schematic diagram of a pulse signal counting state of one circle of the disc.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be understood that the terms "first", "second", etc. in the claims, description, and drawings of the present application are used for distinguishing between different objects and not for describing a particular order. The terms "comprises" and "comprising," when used in the specification and claims of this application, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

FIG. 1 is a functional block diagram of a nonmagnetic metering system according to an embodiment of the present application. The nonmagnetic metrology system 1000 includes an oscillation unit 200, a processor 100, and a puck 300.

As shown in fig. 1, in the present embodiment, the nonmagnetic metering system 1000 includes a disk 300, an oscillating unit 200 (e.g., the peripheral functional module 200 of fig. 1), and a processor 100 (e.g., the MCU module 100 of fig. 1).

The peripheral function module 200 includes a first oscillation module 210 and a second oscillation module 220. The first oscillation module 210 and the second oscillation module 220 are LC oscillation circuits. The first oscillation module 210 and the second oscillation module 220 are measurement oscillation modules.

When the fluid to be measured flows, the disc 300 is driven by the fluid to be measured to horizontally rotate, and the disc 300 comprises a metal area and a non-metal area. The peripheral functional module 200 generates two LC oscillation signals, that is, the first oscillation module 210 generates a first LC oscillation signal, and the second oscillation module 220 generates a second LC oscillation module. The two LC oscillating signals are arranged at an included angle of 90 degrees relative to the center of the disc. The first inductor L1 of the first oscillation module 210 and the second inductor L2 of the second oscillation module 220 are disposed above the disk. When the metal area of the disk 300 is close to the inductor, the oscillation amplitude of the corresponding LC oscillation module is attenuated more rapidly, and the LC oscillation amplitude changes.

The MCU module 100 is connected with the peripheral function module 200, when a metal area and a non-metal area of the disc 300 are close to an LC oscillation circuit, the change of LC oscillation amplitude is generated, different voltage amplitude values are generated, the positions of the metal area and the non-metal area are recorded to determine the revolution number of the disc 300, fluid flow information is calculated through the relation between the pipe diameter and the number of turns driven by fluid based on the revolution number of the disc 300, and the flow information of the fluid to be detected is determined.

Optionally, the area ratio of the metal region to the non-metal region is 1: 1, but not limited thereto. The LC oscillating circuit of the peripheral function module 200 measures the metal area and the non-metal area, and the voltage amplitude is different.

Fig. 2 is a second functional block diagram of a nonmagnetic metering system according to an embodiment of the present application. The nonmagnetic metrology system 1000 includes an oscillation unit 200, a processor 100, and a puck 300.

As shown in fig. 2, in the present embodiment, the nonmagnetic metering system 1000 includes a disk 300, an oscillating unit 200 (e.g., the peripheral functional module 200 of fig. 2), and a processor 100 (e.g., the MCU module 100 of fig. 2).

When the fluid to be measured flows, the disc 300 is driven by the fluid to be measured to horizontally rotate, and the disc 300 comprises a metal area and a non-metal area.

The peripheral function module 200 generates two LC oscillation signals, which are arranged at an included angle of 90 degrees with respect to the center of the disc. The first inductor L1 of the first oscillation module 210 and the second inductor L2 of the second oscillation module 220 are disposed above the disk. When the disc metal area is close to the inductor, the oscillation amplitude of the corresponding LC oscillation module is reduced rapidly, and the LC oscillation amplitude changes.

The MCU module 100 is connected with the peripheral function module 200, changes of LC oscillation signal amplitude are generated when a metal area and a non-metal area of the disc 300 are close to an LC oscillation circuit, different voltage amplitudes are generated, positions of the metal area and the non-metal area are recorded to determine the revolution number of the disc 300, fluid flow information is calculated through the relation between the pipe diameter and the number of turns of fluid driving based on the revolution number of the disc 300, and flow information of the fluid to be detected is determined.

The MCU block 100 includes a comparator block 110, a pulse counting block 140, an encoder block 150, and a rotation counting block 160.

The first oscillation module 210 and the second oscillation module 220 are connected to the positive terminal of the comparator module 110, the DAC module 130 is connected to the negative terminal of the comparator module 110, the output terminal of the comparator module 110 is connected to the pulse counting module 140, and further connected to the encoder module 150, and the encoder module 150 is connected to the rotation counting module 160.

When the metal area of the disk 300 is close to the inductor, the oscillation amplitude of the corresponding LC oscillation module is attenuated more rapidly, and the LC oscillation amplitude changes. Therefore, when the metal area and the non-metal area of the disk 300 cover the LC oscillation circuit, the oscillation amplitude of the oscillation circuit changes. By detecting the oscillation amplitude of the LC oscillation signal circuit, the LC oscillation signal circuit is compared with a set voltage by the comparator module 110, and converted into a square wave pulse to be output. The pulse counting module 140 is connected to the output end of the comparator module 110, and counts according to the square wave pulse output by the comparator module 110. The encoder module 150 is connected to the pulse counting module 140, compares the number of each square wave pulse signal with the pulse number threshold, determines whether each LC oscillating circuit measures a metal area or a non-metal area of the disc, encodes the states of the first inductance of the first oscillating circuit and the second inductance of the second oscillating circuit according to the counting variation of the square wave pulses, and outputs the encoded states to the rotation counting module 160. The rotation counting module 160 records the sequence of the state combination codes of the first inductor and the second inductor and the cycle number, so as to judge the rotation angle and the direction information of the disc and measure the rotation number of the disc.

Optionally, the MCU module 100 further comprises a charging module 120, a DAC module 130, a clock module 170 and a stimulus voltage 180.

The charging module 120 is connected to the input terminals of the first oscillating module 210, the second oscillating module 220, and the third oscillating module. The charging module 120 charges the first oscillation module 210, the second oscillation module 220, and the third oscillation module 230 in an interval periodic manner. The activation voltage 180 provides power to the charging module 120. The DAC module 130 (digital-to-analog conversion circuit) is connected to the comparator module 120, and sets a predetermined voltage. The clock module 170 provides clock signals to the encoder module 150, the pulse count module 140, and the comparator module 110.

Optionally, the peripheral function module 200 further includes a third oscillation module 230, and the third oscillation module 230 is an alarm oscillation module for determining whether the disc position is normal.

The three LC oscillator circuits work together to further determine whether the third oscillator module 230 measures a metallic or non-metallic area of the puck 300, based on the above-described principles of operation. If the three LC oscillating circuits measure the metal area of the disc 300, indicating that a magnet is close, the MCU module 100 sends out an alarm. If the three LC oscillating circuits measure non-metal areas of the disc 300, the disc 300 falls off, and the MCU module 100 gives an alarm.

Optionally, the oscillation frequency of the LC oscillation circuit is between 100KHz and 50MHz, and the preferred frequency range is between 100KHz and 1000KHz, but not limited thereto, according to the characteristic of the LC oscillation circuit and the monitoring distance.

Optionally, the MCU module 100 further includes a communication module, and the communication module performs remote communication with the management terminal to upload the flow information of the fluid to be measured.

The non-magnetic metering system has the characteristic of low power consumption, and the overall power consumption is less than 20 uA. Further by reducing the sampling period, i.e. the time to generate a ringing, the overall power consumption can be less than 15 uA. By analogy, further may be less than 10uA, further may be less than 5uA, further may be less than 3 uA.

In S100, the number of revolutions of the horizontally rotating disk driven by the fluid to be measured is detected using the LC oscillation signal from the oscillation unit (peripheral function module 200). Including steps S110-S150 as shown in fig. 4.

In S110, the comparator module of the MCU module receives the two LC oscillating circuits from the oscillating unit (the peripheral functional module 200) to generate two LC oscillating signals CH0, CH 1.

The disk includes a metallic region and a non-metallic region. The inductor L1 of the first oscillation module 210 and the inductor L2 of the second oscillation module 220 are disposed above the disk. When the disk metal area is close to the inductor, the oscillation amplitude of the corresponding LC oscillation module is attenuated more rapidly, and the amplitude of the LC oscillation signals CH0 and CH1 is changed.

In S120, the comparator module 110 of the MCU module compares the voltage amplitudes of the two LC oscillating signals CH0 and CH1 with preset voltages, respectively, and outputs two square wave pulse signals.

Specifically, the comparator module 110 of the MCU module compares the voltage amplitudes of the two LC oscillation signals CH0 and CH1 with a preset voltage, respectively, and outputs a square wave pulse signal when the voltage amplitudes are greater than the preset voltage. The preset voltage can be set directly or through the DAC module 130.

In S130, the pulse counting module 140 of the MCU module counts the number of square wave pulse signals in each path.

The number of the pulse signals of the CH0 channel is denoted as S, and the number of the pulse signals of the CH1 channel is denoted as S0.

In S140, the encoder module 150 of the MCU module compares the number of each pulse signal with the pulse number threshold, determines whether each LC oscillating circuit measures a metal area or a non-metal area of the disk, and encodes the inductance state of the oscillating circuit.

The number S of pulse signals of the CH0 channel is greater than the non-metal area pulse number threshold value S1, it is determined that the LC oscillating circuit of the CH0 channel measures the non-metal area of the disk, and the encoder module 150 records the state as 1. The number S of pulse signals of the CH0 channel is smaller than the metal area pulse number threshold value S2, it is determined that the LC oscillating circuit of the CH0 channel measures the metal area of the disk, and the encoder module 150 records the state as 0.

Similarly, the number S0 of the pulse signals of the CH1 channel is greater than the non-metal area pulse number threshold value S1, and it is determined that the LC oscillating circuit of the CH1 channel measures the non-metal area of the disk. The number S of the pulse signals of the CH1 channel is smaller than the metal area pulse number threshold value S2, and the LC oscillating circuit of the CH1 channel is determined to measure the metal area of the disk.

According to some embodiments, as shown in fig. 5A-5D, the metal and non-metal regions are 1: 1, when the disc rotates horizontally, the pulse signal counting state is shown in the figure.

In fig. 5A, the state of CH0 channel and CH1 channel is 00, indicating that both LC oscillating circuits measure the metal area of the disk 300.

In fig. 5B, as the disk 300 is rotated horizontally counterclockwise, the states of the CH0 channel and the CH1 channel are 10, indicating that the LC oscillating circuit of the CH0 channel measures the non-metal area of the disk 300 and the LC oscillating circuit of the CH1 channel measures the metal area of the disk 300.

In fig. 5C, as the disk 300 is rotated horizontally counterclockwise, the states of the CH0 channel and the CH1 channel are 11, and LC oscillation circuits representing the CH0 channel and the CH1 channel measure non-metal areas of the disk 300.

In fig. 5D, as the disk 300 is rotated horizontally counterclockwise, the states of the CH0 channel and the CH1 channel are 01, and the LC oscillating circuit representing the CH0 channel measures the metal area of the disk 300, and the LC oscillating circuit representing the CH1 channel measures the non-metal area of the disk 300.

In addition, and in accordance with some embodiments, as shown in fig. 6A-6D, the metal and non-metal regions are 1: 3, the pulse signal counts as shown in the figure when the disc 300 is rotated horizontally.

In fig. 6A, the state of CH0 channel and CH1 channel is 00, indicating that both LC oscillating circuits measure the metal area of the disk 300.

In fig. 6B, as the disk 300 is rotated horizontally counterclockwise, the states of the CH0 channel and the CH1 channel are 10, indicating that the LC oscillating circuit of the CH0 channel measures the non-metal area of the disk 300 and the LC oscillating circuit of the CH1 channel measures the metal area of the disk 300.

In fig. 6C, as the disk 300 is rotated horizontally counterclockwise, the states of the CH0 channel and the CH1 channel are 11, and the LC oscillating circuits representing the CH0 channel and the CH1 channel both measure non-metallic areas of the disk 300.

In fig. 6D, as the disk 300 is rotated horizontally counterclockwise, the states of the CH0 channel and the CH1 channel are 01, indicating that the LC oscillating circuit of the CH0 channel measures the metal area of the disk 300 and the LC oscillating circuit of the CH1 channel measures the non-metal area of the disk 300.

In S150, the rotation counting module 160 of the MCU module records the sequence of the inductance state combination codes of the oscillation circuit and the number of cycles, thereby determining the rotation angle and direction information of the disc 300 to measure the number of rotations of the disc 300.

In S200, flow rate information of the fluid to be measured is determined based on the number of revolutions of the disk 300.

The conversion relationship between the rotation number of the disk 300 and the flow information of the fluid to be measured depends on the fixed structure transmission relationship between the disk 300 and the flow meter. According to some embodiments, if one revolution of the disk 300 occurs at a flow rate of Table 1L, the disk 300 rotates one revolution for a metered 1L. If the disk 300 rotates one revolution for a flow of meter 10L, the disk 300 rotates one revolution for metering 10L. And is not limited thereto.

The above embodiments are only for illustrating the technical idea of the present application, and the protection scope of the present application is not limited thereby, and any modifications made on the basis of the technical solution according to the technical idea presented in the present application fall within the protection scope of the present application.

Claims

1. A nonmagnetic metering system comprising:

the disc is driven by the fluid to be detected to horizontally rotate and comprises a metal area and a non-metal area;

the oscillating unit comprises two LC oscillating circuits which generate two LC oscillating signals;

and the processor is connected with the oscillation unit, when the metal area and the non-metal area of the disc are close to the LC oscillation circuit, the amplitude of the LC oscillation signal changes, different voltage amplitudes are generated, the positions of the metal area and the non-metal area are recorded so as to determine the revolution number of the disc, and the flow information of the fluid to be measured is determined based on the revolution number of the disc from the oscillation unit.

2. The metrology system of claim 1, wherein the area ratio of the metallic region to the non-metallic region is 1: 1.

3. the metrology system of claim 1, wherein the processor comprises:

the comparator module is connected with the oscillation unit, compares the voltage amplitude generated by the magnetic induction linear cutting of each path of LC oscillation signal by the metal area or the nonmetal area of the disc with a preset voltage, and outputs two paths of pulse signals;

the pulse counting module is connected with the output end of the comparator module and counts the number of the pulse signals of each path;

the encoder module is connected with the pulse counting module, compares the number of the pulse signals of each path with a pulse number threshold value, determines that the LC oscillating circuit of each path measures a metal area or a non-metal area of the disc, encodes the inductance state of the oscillating circuit and outputs the code to the rotation counting module;

and the rotation counting module is used for recording the sequence of the inductance state combination codes of the oscillating circuit and the cycle number, so as to judge the rotation angle and direction information of the disc and measure the revolution of the disc.

4. The metering system of claim 4 wherein the processor further comprises:

the charging circuit is connected with the oscillating unit and charges the two LC oscillating circuits at intervals;

and the digital-to-analog conversion circuit is connected with the comparator module and used for setting the preset voltage.

5. The gauging system of claim 4, wherein an oscillation frequency of the LC tank circuit is between 100KHz and 50 MHz.

6. The metering system of claim 1 wherein the processor further comprises:

and the communication module is in remote communication with the management terminal and uploads the flow information of the fluid to be detected.

7. A method of metrology of a nonmagnetic metrology system as described in any one of claims 1 to 6, comprising:

detecting the number of revolutions of the horizontally rotating disk driven by the fluid to be measured by using an LC oscillation signal from the oscillation unit;

and determining the flow information of the fluid to be measured based on the rotation number of the disc.

8. The metering method of claim 7, wherein said detecting a number of revolutions of said fluid-driven horizontally-rotating disk to be measured using an LC oscillation signal from said oscillation unit comprises:

receiving two LC oscillation signals from the oscillation unit;

comparing the voltage amplitude of each path of LC oscillation signal with a preset voltage, and outputting two paths of pulse signals;

counting the number of each path of pulse signals;

comparing the number of the pulse signals of each path with a pulse number threshold value, determining that the LC oscillating circuit of each path measures a metal area or a non-metal area of the disc, and encoding the inductance state of the oscillating circuit;

and recording the sequence of the inductance state combination codes of the oscillation circuit and the cycle number, thereby judging the rotation angle and direction information of the disc and measuring the rotation number of the disc.

9. The metering method of claim 8, wherein the comparing the voltage amplitude of each LC oscillating signal with a preset voltage and outputting two pulse signals comprises:

and when the voltage amplitude of each path of LC oscillation signal is greater than the preset voltage, outputting the pulse signal.

10. The metrology method of claim 8, wherein said comparing the number of said pulse signals per path to a pulse number threshold to determine whether said LC tank circuit measures a metallic or non-metallic region of said disk comprises:

the number of the pulse signals is larger than a first pulse number threshold value, and the fact that the non-metal area of the disc is measured by the LC oscillating circuit is determined;

and determining that the metal area of the disc is measured by the LC oscillating circuit when the number of the pulse signals is less than a second pulse number threshold value.