WO2019233388A1

WO2019233388A1 - High-precision bidirectional meter for metering fluid

Info

Publication number: WO2019233388A1
Application number: PCT/CN2019/089881
Authority: WO
Inventors: 魏松涛; 姚玉婷; 田飞; 魏贝贝; 李沿; 雷利; 李亚龙; 魏京涛; 李显
Original assignee: Wei Songtao
Priority date: 2018-06-04
Filing date: 2019-06-03
Publication date: 2019-12-12
Also published as: CN108426619B; CN108426619A

Abstract

A high-precision bidirectional meter for metering fluid, comprising a meter housing (1), a meter core (2) and a control circuit (3). The meter core (2) comprises: an impeller (201), an impeller shaft (202) and a fixing frame (203), a magnet (2011) being provided in the middle of the impeller (201). The control circuit (3) comprises: a lithium battery (301), an induction coil (302), a first Hall sensor (303), a second Hall sensor (304), a display screen (305), a main control chip (306), a storage unit (307), an electromagnetic damping control circuit (308) and a wireless charging management circuit (309). The positions of the induction coil (302), the first Hall sensor (303) and the second Hall sensor (304) all correspond to the position of the magnet (2011) on the impeller (201), and the induction coil (302) can cut the magnetic field lines of the magnet (2011), so as to generate an induction voltage. By replacing mechanical transmission with an electronic circuit, the meter improves metering accuracy, reduces energy loss, and can prevent the meter from not metering upon powering off, and avoid self-rotation of the meter, realizing the functions of high-accuracy measurement, low power consumption, being long-term maintenance free and being an anti-magnet.

Description

High-precision two-way metering fluid meter

Cross-reference to related applications

This disclosure claims the priority of a Chinese patent application with the application number of 2018105614760, entitled “High-precision Two-way Measurement Electronic Water Meter”, which was filed on June 04, 2018. The entire content of this patent application is incorporated herein by reference in its entirety. .

Technical field

The present disclosure belongs to the field of measuring instruments, and in particular relates to a high-precision bidirectional fluid measuring meter.

Background technique

Water meters are instruments used to measure water flow and are widely used in homes, factories, offices and many other fields. The types of water meters can be divided by the principle of measurement. The common types are:

a) Mechanical water meters: The measuring sensors, calculators and indicating devices are all water meters with mechanical principles and structures. There are mainly speed water meters and volume water meters.

b) Mechanical water meters equipped with electronic devices: Mechanical water meters with a complete structure are retained. Water meters with electronic devices are added on this basis, mainly including IC card water meters and remote water meters.

c) Electronic water meters: Electronic water meters are divided into mechanical sensing electronic water meters and electronic sensing electronic water meters.

The measuring sensor of the mechanical sensing electronic water meter is composed of a sensor based on the principle of mechanical movement and a sensing element capable of converting mechanical movement into an electrical signal input into a calculator. The calculator and the indicating device are electronic components, such as a vortex (leaf) wheel Electronic water meter. The electronic water meter's measuring sensor is based on the principle of electronic or electromagnetic induction. The calculator and indicating device are electronic components, such as ultrasonic water meters, jet water meters, Coriolis water meters and electromagnetic water meters.

However, during the use of water meters, the following problems exist:

1. Water meter rotation problem:

Water flows forward and backward in the water meter for many times, causing the cumulative error measurement of the water meter in the forward and reverse directions to cause the rotation of the water meter;

2. Inversion and misappropriation of water meters:

Generally, the mechanical watch is lowered in and out when the water enters, pushing the gears forward, and reversed when it is in the water, it pushes the gears in reverse. The resistance of the two-phase water is different, although the water in the two ends is the same. However, the readings reflected on the water meter are very different. On the other hand, the water meter has a minimum initial dynamic amount of water. When the faucet is dripped, the water flow cannot push the impeller blades to rotate, so some water meters cannot be measured normally.

3. Power consumption and battery replacement of water meter:

Existing smart watches and remote meters often need to replace batteries during the expected life, which affects the long-term stable use of the device;

4, the use of water meters:

At present, water meter products commonly used at home and abroad are mainly traditional mechanical water meters and water meters with electronic devices. Most of these two types of water meters use the principle of mechanical impeller blade type and rotary piston type transmission (sensor). The mechanical counter indicates the measurement result or the sensor obtains the mechanical rotation signal and displays the measurement result after processing. Due to problems in principle and structure, there are many deficiencies and defects in the service life, measurement repeatability and reliability, measurement accuracy, requirements for water quality, and acquisition and transmission of measurement signals.

5. Production, testing and maintenance of water meters:

Most of the existing water meters use mechanical structures. Due to the use of mechanical transmission and mechanical adjustment structures, the water meter's production capacity is greatly limited. At the same time, such water meters require professional technicians to install and debug during production testing, fault detection and on-site maintenance. , The higher requirements for production testers, resulting in low efficiency of installation, commissioning and maintenance.

In view of the above problems, there is an urgent need for a water meter capable of solving the above problems. To this end, the present disclosure proposes a high-precision two-way electronic water meter.

Summary of the Invention

In view of the technical problems raised in the background, the present disclosure discloses a high-precision two-way measurement electronic meter, the purpose of which is to improve the measurement accuracy of the meter, reduce power consumption, prevent multiple power outages, facilitate maintenance, prevent flips and theft, Increase its production capacity, without the need for professional technicians to install testing and maintenance, to achieve data upload, download and update through wireless means.

In order to solve the above technical problems, the present disclosure provides 1. A high-precision fluid meter, comprising a watch case, a watch core and a control circuit, characterized in that the watch core and the control circuit are arranged in the watch case; the watch core includes: , The impeller shaft, the fixed frame, the fixed frame is fixed in the case and connected to one end of the impeller shaft, the impeller is arranged on the other end of the impeller shaft away from the fixed frame, the plane of the fixed frame and the plane of the impeller are arranged in parallel on the impeller shaft, table The fluid to be measured inside the shell flows through the impeller. The impeller is also provided with at least one magnet, and each magnet is fixedly disposed in the middle of the impeller to make the magnet rotate with the impeller when the fluid to be tested impacts the impeller; the control circuit includes: Lithium battery, induction coil, first Hall sensor, second Hall sensor, display screen, main control chip, storage unit, electromagnetic damping control circuit and wireless charging management circuit; lithium battery, first Hall sensor, second Huo Sensor, display screen, storage unit, electromagnetic damping control circuit and wireless charging management circuit are all electrically connected to the main control chip; induction wire It is electrically connected to the electromagnetic damping control circuit and the wireless charging management circuit respectively; the lithium battery is also electrically connected to the wireless charging management circuit; the induction coil, the first Hall sensor and the second Hall sensor are all arranged on the fixed frame and the positions are all connected to the magnet The position on the impeller corresponds, so that when the impeller rotates, the induction coil generates an inductive current to charge the lithium battery, and the first Hall sensor and the second Hall sensor can detect the magnetic field change generated by the magnet; It is further configured to determine a flow velocity and / or a direction of the fluid to be measured according to a magnetic field change detected by the first Hall sensor and the second Hall sensor.

Optionally, the high-precision fluid meter is a water meter, and the fluid to be measured is water.

Optionally, the first Hall sensor and the second Hall sensor are set at a certain preset distance; and the main control chip is further configured to determine the sequence in which the first Hall sensor and the second Hall sensor detect the magnetic fields, respectively. , And determine the direction of the fluid to be measured according to the sequence.

Optionally, the main control chip is further configured to calculate a change rate of the magnetic field change detected by the first Hall sensor and / or the second Hall sensor, and determine the flow rate of the fluid to be measured according to the change rate.

Optionally, the impeller shaft is arranged vertically, the fixed frame is connected to the upper end of the impeller shaft, and the impeller is arranged at the lower end of the impeller shaft.

Optionally, the rotation plane of the impeller is parallel to the traveling direction of the fluid to be measured.

Optionally, there are six blades of the impeller and six magnets, and each magnet is respectively disposed in the middle of a corresponding one of the blades.

Optionally, the magnets are arranged along the circumferential direction of the impeller in an arrangement manner in which the N and S poles are opposite to each other.

Optionally, the fixed frame is further provided with a first shielding cover and a second shielding cover, and the control circuit is disposed in the first shielding cover and the second shielding cover.

Optionally, the first shield is made of iron; the second shield is made of aluminum or copper foil, and the first shield and the second shield are grounded inside the case.

Optionally, the first Hall sensor and the second Hall sensor both adopt a bipolar Hall sensor.

Optionally, a power management circuit is also connected between the lithium battery and the main control chip.

Optionally, the main control chip is further connected with a temperature sensor.

Optionally, the main control chip is further connected with a valve body control circuit.

Optionally, the main control chip is further connected with a wireless communication circuit and an infrared communication circuit.

Optionally, the power management circuit further includes a trigger circuit portion; the trigger circuit portion is configured to: when the impeller does not rotate or rotates less than a first predetermined speed, the trigger circuit portion controls the lithium battery to suspend power to the components in the control circuit; When the speed is higher than the first predetermined rotation speed, the trigger circuit part controls the lithium battery to supply power to the components in the control circuit again.

Optionally, the wireless charging management circuit further includes a circuit control switch; the circuit control switch is configured to: when detecting that the rotation speed of the impeller is less than a second predetermined rotation speed, control the wireless charging management circuit to disconnect and suspend the charging operation of the lithium battery.

Optionally, the electromagnetic damping control circuit is configured to control the lithium battery to apply a voltage to both ends of the electromagnetic damping control circuit when it is detected that the rotating speed of the impeller is greater than a third predetermined rotating speed, so as to facilitate electromagnetic damping to slow down the rotating speed of the impeller; The third predetermined speed is greater than the second predetermined speed.

Optionally, the main control chip uses STM32L151RB.

Optionally, the magnet is a bar-shaped strong magnet.

Optionally, the water meter core and the control circuit are arranged in the water meter case; the water meter core includes: an impeller, an impeller shaft, a fixed frame, the impeller is disposed at one end of the impeller shaft, the fixed frame is disposed at the other end of the impeller shaft, and the fixed frame and the impeller are at The impeller shaft is arranged in parallel. The impeller is also provided with strong magnetism, which is arranged in the middle of the impeller. The control circuit includes a lithium battery, an induction coil, a first Hall sensor, a second Hall sensor, a display screen, and a main control chip. , Storage unit, electromagnetic damping control circuit and wireless charging management circuit; lithium battery, first Hall sensor, second Hall sensor, display screen, storage unit, electromagnetic damping control circuit and wireless charging management circuit are all connected to the main control chip ; The induction coil is connected to the electromagnetic damping control circuit and the wireless charging management circuit respectively; the lithium battery is also connected to the wireless charging management circuit; the induction coil, the first Hall sensor and the second Hall sensor are all arranged on a fixed frame, the induction coil, The positions of the first Hall sensor and the second Hall sensor correspond to the position of the strong magnet on the impeller, and the strong magnet can Cutting the induction coil.

Optionally, there are six impellers and six strong magnets. The six strong magnets are alternately arranged with N poles and S poles in the same direction of the impeller.

Optionally, the first shielding cover is made of iron sheet; the second shielding cover is made of aluminum or copper foil, and the first shielding cover and the second shielding cover are grounded inside the water meter case.

The beneficial effects of the present disclosure are: replacing the mechanical transmission part by adding a magnet to the impeller and the induction coil in the control circuit to reduce the mechanical loss and improve the measurement accuracy; by adding the first Hall sensor and the second Hall sensor The recognition of the impeller rotation direction and the impeller rotation speed are realized, the measurement error of the meter is inverted and the rotation of the meter is avoided, and the measurement accuracy of the water flow is improved; the wireless charging management circuit is added to realize the function of charging the lithium battery, and solves the problem Power failure and later maintenance of lithium battery life; electromagnetic damping control circuit is set up to achieve dynamic changes between the impeller's magnets and induction coils, keeping the impeller within a certain dynamic range, achieving dynamic balance, and increasing large flow rates The anti-overload capability of the lower meter greatly reduces mechanical wear and extends the working life.

BRIEF DESCRIPTION OF THE DRAWINGS

1 is a schematic diagram of an internal structure of a high-precision bidirectional fluid electronic meter in an embodiment of the present disclosure;

2 is a schematic diagram of the working principle of a high-precision bidirectional fluid electronic meter in an embodiment of the present disclosure;

FIG. 3 is a schematic structural diagram of the control circuit 3 shown in FIG. 1.

Detailed ways

The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, but not all of the embodiments. The specific embodiments described herein are only used to explain the disclosure, and are not intended to limit the disclosure. Based on the embodiments in the present disclosure, all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the protection scope of the present disclosure.

Please refer to FIG. 1, the high-precision bidirectional fluid meter 100 includes: a watch case 1, a watch core 2, and a control circuit 3. The watch case 1 is used to accommodate the watch movement 2 and the control circuit 3 and other internal parts of the watch. The watch case 1 is provided with a first port and a second port to allow fluid to flow in and out. Normally, the fluid enters the watch case 1 through the first port, and then exits through the second port. However, due to the presence of mixed gas or fluctuations in the fluid, the backflow of the fluid occurs in a few cases, that is, the fluid enters the watch case 1 from the second port and leaves the first port. It should be noted here that although the fluid meter is used as a water meter in this embodiment, that is, the fluid passing through the meter is water, but in other embodiments of the present disclosure, the fluid meter can also be used as a gas meter, oil Tables, etc., that is, the fluid to be measured in the table is gas or oil.

The watch movement 2 and the control circuit 3 are arranged in the watch case 1. The watch movement 2 includes: an impeller 201, an impeller shaft 202, and a fixed frame 203; the watch movement 2 is mainly used for recording fluid flow.

The impeller 201 is fixed at the lower end of the impeller shaft 202, and it is best that the impeller 201 can rotate freely under a fluid impact; the fixing frame 203 is fixed at the upper end of the impeller shaft 202 and is arranged in parallel with the impeller 201. In this embodiment, the impeller shaft 202 is vertically arranged, the fixed frame 203 is connected to the upper end of the impeller shaft 202, and the impeller 201 is disposed at the lower end of the impeller shaft. In other words, the impeller 202 is suspended below the fixed frame 203. The impeller 201 is located in the flow path of the fluid to be measured, and the fixed frame 203 is disposed above the flow path of the fluid. The advantage of this setting is that it is convenient for the fluid to flow through the watch movement 2, and it is beneficial for the fluid to impact the impeller 201 to promote its rotation. At the same time, the components (Hall sensors, control circuits, etc.) provided on the fixed frame 203 are not affected by the fluid. Effect, thereby ensuring the operational stability of these components. Preferably, the rotation plane of the impeller 201 is parallel to the traveling direction of the fluid to be measured to further improve the impact effect of the fluid on the impeller 201.

The central part of the impeller 201 is provided with a magnet 2011, and the magnet 2011 can be fixed to the central part of the impeller 201 in any feasible manner, for example, fixed by screws, snap-fastened, pasted or integrated. In this embodiment, the magnet 2011 is preferably a bar-shaped strong magnet, and 6 blade impellers 201 and 6 magnets 2011 are preferably used. The 6 magnets 2011 are respectively disposed in the middle of the blades of the 6 impellers 201, and the 6 magnets 2011 are in one direction. The upper N and S poles are alternately set. Of course, in other embodiments of the present disclosure, there may be more than 6 blades or less than 6 blades, and the number of 2011 magnets may be the same as or different from the number of blades.

In order to prevent the magnet from interfering with the outside world and the outside from interfering with internal electromagnetic induction, a first shielding cover 2031 and a second shielding cover 2032 are provided on the fixing frame 203. Furthermore, the first shielding cover 2031 is made of iron. The second shielding cover 2032 is made of aluminum or copper foil, and the first shielding cover 2031 and the second shielding cover 2031 are grounded inside the high-precision bi-directional meter 100. The first shielding cover 2031 prevents the interference of the external permanent magnets, and the second shielding cover 2032 prevents the external high-frequency alternating magnetic field interference.

Preferably, the size of the shielding cover is reduced while preventing the interference of the magnet to the outside and the internal electromagnetic induction from the outside, which is convenient for production and installation and debugging. A shielding cover is provided on the fixed frame 203, and the shielding cover is provided. Plated with conductive material. The material of the shielding cover is an iron material, which may be an iron cover; and the conductive material is copper or zinc. The shielding cover is used to prevent the interference of external permanent magnets, and the conductive material plated on the shielding cover is used to prevent the external high-frequency alternating magnetic field interference.

Please refer to FIG. 3. The control circuit 3 includes: a lithium battery 301, an induction coil 302, a first Hall sensor 303, a second Hall sensor 304, a display screen 305, a main control chip 306, a storage unit 307, and an electromagnetic damping control circuit. 308 and wireless charging management circuit 309.

In this embodiment, preferably, the main control chip 306 uses STM32L151RB.

The control circuit 3 is disposed in the watch case 1, and the induction coil 302 is disposed on the fixed frame 203. When the impeller 201 rotates, the magnetic field lines of the magnet 2011 can cut the induction coil 302 to generate an induced voltage.

The first Hall sensor 303 and the second Hall sensor 304 are disposed on the fixed frame 203, and the positions thereof correspond to the magnets 2011 on the impeller 201, and are used to identify the steering and rotation speed of the impeller 201. According to the above description, the plane where the fixed frame 203 is located is substantially parallel to the plane where the impeller 201 is located. Therefore, during the rotation of the impeller 201, the vertical distance between the

Hall sensors

303 and 304 provided on the fixed frame 203 and the magnet 2011 on the blade Basically remains unchanged, thereby ensuring the accuracy of the measurement results. In this embodiment, the length of the impeller shaft 202 should be within a preset length range to ensure the best measurement effect of the Hall sensor.

Preferably, the first Hall sensor 303 and the second Hall sensor 304 are bipolar Hall sensors. The display screen 305 is connected to the main control chip 306 and is used to display the working status of the fluid meter and related metering information. The storage unit 307 is connected to the main control chip 306 and is configured to store configuration information of the main control chip 306 and related data storage. Both ends of the electromagnetic damping circuit 308 and the wireless charging management circuit 309 are connected to the induction coil 302 and the main control chip 306, respectively. The wireless charging management circuit 309 is connected to the lithium battery 301 for charging the lithium battery 301. The lithium battery 301 is connected to the main control chip 306, and the lithium battery 301 supplies power to the main control chip 306. In this embodiment, the lithium battery 301 is used as the power source of the control circuit 3 and can supply power to at least some of the components in the control circuit 3, for example, the main control chip 306, the display screen 305, and the like. In this embodiment, when the fluid drives the impeller 201 to rotate, the magnet 2011 rotates with the impeller 201 and changes the nearby magnetic field, thereby causing the magnetic flux in the induction coil 302 to change with time, thereby generating an induced current. The induced current is rectified by the wireless charging management circuit 309 and converted into direct current, and then the lithium battery 301 is charged. Techniques for rectifying AC power to DC power are well known to those skilled in the art and will not be described in detail here. The advantage of the meter 100 in this embodiment is that during the use of the meter (that is, the fluid impinges on the impeller 201 to rotate it), power can be supplied to some components in the control circuit 3, so the fluid meter 100 in this embodiment Autonomous power supply can be achieved without the need for an externally connected power source, or with the assistance of an external power source that requires less power.

A power management circuit 3011 is further provided between the lithium battery 301 and the main control chip 306, and is used for output management of multiple power sources, including the lithium battery 301 voltage detection and power control. Preferably, there is also a trigger circuit part in the power management circuit 3011. In this embodiment, the trigger circuit part may be a control switch or a component that can implement similar functions. When the impeller 201 does not rotate or rotates less than the first predetermined rotation speed, the meter 100 will enter a sleep low power consumption state. At this time, the trigger circuit part controls the lithium battery 301 to suspend power supply to the components in the control circuit 3. When the speed of the impeller 201 is higher than the first predetermined speed, that is, after the induced voltage generated by the induction coil 302 is greater than a predetermined voltage value, the trigger circuit part will activate the start-up meter 100 and control the lithium battery 301 to return to the control circuit 3 The components are powered to ensure their proper operation.

The wireless charging management circuit 309 and the electromagnetic damping circuit 308 are connected in parallel to the two ends of the electromagnetic coil, respectively. The wireless charging management circuit 309 and the electromagnetic damping circuit 308 control the current in the electromagnetic coil at the same time. When there is a current in the electromagnetic coil, the rotation of the impeller 201 will be hindered (also known as a damping effect) due to electromagnetic induction. The role of the electromagnetic damping circuit 308 is to change the electromagnetic coil pair by adjusting the current in the electromagnetic coil. The magnitude of the damping effect of the impeller 201 makes the rotation speed of the impeller 201 be regulated within a reasonable value range.

In this embodiment, preferably, a temperature sensor 310 is further connected to the main control chip 306 for detecting the internal temperature of the meter to prevent damage caused by abnormal temperature; a valve body control circuit is also connected to the main control chip 306 311 is used to drive the execution of the valve body; a wireless communication circuit 312 is also connected to the main control chip 306 for bidirectional data exchange between the meter and the data center, sending the status and working data of the meter, and receiving control commands, and The remote firmware program is updated; the main control chip 306 is also connected with the infrared communication circuit 313, which is used for the handheld terminal to read and write the meter data and view the meter status information. In the debug mode, through the receiving port of the infrared communication circuit 313, the data calibration and correction can be performed without opening the case of the meter, and the internal procedures of the meter can be upgraded and the data can be exported. By downloading different programs, and Parameter configuration and data correction can form different types of meters, reduce inventory pressure, facilitate batch and standardized production, effectively reduce production time costs and labor costs, and solve the problem of insufficient production capacity.

The specific working mode of the high-precision two-way meter 100 is: connect the meter to the tap water pipe, activate the valve, and the water current drives the impeller 201 in the watch core 2 to rotate. The magnet 2011 on the impeller 201 also rotates with the impeller 201, and the induction coil 302 performs magnetic field cutting, and the induction coil 302 can generate an induced voltage, and the induced voltage charges the lithium battery 301 through the wireless charging management circuit 309.

While the impeller 201 rotates, the first Hall sensor 303 and the second Hall sensor 304 can identify the rotation direction and rotation speed of the impeller 201, and transmit the rotation information of the impeller 201 to the main control chip by magnetic coupling. 306. The number of Hall pulses is converted into flow velocity information by an algorithm, and then converted into flow information. The specific working principle is: when the fluid impinges on the impeller 201, it is driven to rotate, and the magnet 2011 on the impeller rotates with the impeller 201 and periodically passes near the two

Hall sensors

303 and 304. Whenever the magnet 2011 passes the

Hall sensors

303, 304, the Hall sensor will generate a signal pulse. Generally speaking, the frequency of the above-mentioned signal pulse and the flow velocity of the fluid have a positive correlation. Specifically, the greater the flow velocity of the fluid, the higher the frequency of the detected signal pulse. The above-mentioned positive correlation may be stored in the main control chip 306 in the form of a functional relationship, so that the main control chip 306 converts the number of Hall pulses into flow velocity information through an algorithm, and then converts into flow information.

Specifically, the first Hall sensor 303 and the second Hall sensor 304 may be fixed on the fixed frame 203 and set at a predetermined distance. The preset distance should be smaller than the distance between the middle portions of adjacent blades of the impeller 201 to avoid detection errors. The main control chip 306 is configured to determine the sequence in which the first Hall sensor 303 and the second Hall sensor 304 respectively detect the magnetic field, and determine the direction of the fluid to be measured according to the sequence.

The fluid meter of this embodiment can not only accurately calculate the flow rate of the fluid, but also detect the direction of movement of the fluid, that is, detect whether the fluid is flowing forward (that is, flowing from the first port to the second port) or reversely The second port flows toward the first port). With reference to Figure 2, we will further explain its specific working principle: In this embodiment, when the fluid is flowing forward, the impeller 201 is driven to rotate counterclockwise (that is, the direction indicated by the arrow D1 in the figure), and the corresponding magnet Will pass the first Hall sensor 303 first, and then pass the second Hall sensor 304, so in this case, the main control chip 306 will first receive the pulse signal of the first Hall sensor 303, and then receive the second Hall sensor The sensor 304 can determine that the fluid is flowing forward. When the fluid flows in reverse, the situation is reversed, the impeller 201 will rotate counterclockwise (ie, the direction indicated by the arrow D2 in the figure), and the main control chip 306 will first receive the pulse signal from the second Hall sensor 304 and then receive The first Hall sensor 303 is capable of determining that the fluid flows in the reverse direction (that is, backflow).

After the main control chip 306 receives the flow information and flow direction information detected by the two Hall sensors, the total flow of the fluid in the detection time can be performed through a preset program. Specifically, by programming, the flow data of the fluid flowing in the positive direction is recorded as a positive value, and the flow data of the fluid flowing in the reverse direction is recorded as a negative value, and then all the positive and negative values in the detection time are accumulated to obtain the detection. Total fluid flow over time. The advantage of the fluid meter of this embodiment is that it can determine the flow direction of the fluid while measuring the flow rate of the fluid, so as to prevent the flow rate of the fluid from being returned as a forward flow rate, thereby accurately obtaining the total flow rate of the fluid and reducing Measurement error.

The first shielding cover 2031 is used to prevent magnetic interference from the permanent magnets on the induction coil 302 and the magnet 2011. The second shielding cover 2032 is used to prevent interference from external high-frequency alternating magnetic fields.

In view of the fact that the induction coil 302 generates an induced electromotive force under the image of the magnet 2011, in the case of a small flow rate of the water pipe, for example, when the speed of the impeller 201 is less than the second predetermined speed, the induction voltage of the induction coil 302 is low. The management circuit 309 charges the lithium battery 301. Because of the electromagnetic damping phenomenon, the impeller will also receive a reaction force. At this time, resistance will hinder the measurement of small flow. In this embodiment, the corresponding circuit switch disconnects the wireless charging management circuit 309 in the above-mentioned situation, no current is generated in the electromagnetic coil, and the control by the electromagnetic damping control circuit 308 avoids the generation of electromagnetic damping effects to prevent small flow measuring. In the case of a large flow rate of the water pipe, for example, when the rotation speed of the impeller 201 is greater than the third predetermined rotation speed (the third predetermined rotation speed is greater than the second predetermined rotation speed), the lithium battery 301 controllably outputs a voltage to the electromagnetic damping control circuit 308. This can change its damping effect on the impeller 201, control the appropriate electromagnetic damping effect through the electromagnetic damping control circuit 308, so that the magnet 2011 and the induction coil 302 maintain a reasonable dynamic range, and further make the impeller 201 levitate in the middle of the impeller shaft 202 to rotate, It achieves dynamic balance, and at the same time improves the overload resistance of the meter under large flow rates. The electromagnetic damping control circuit 308 is used to control the rotation speed of the impeller 201 within a certain value range to prevent the rotation speed of the impeller 201 from being too fast, thereby greatly reducing mechanical wear and extending the working life.

The above are only examples of the present disclosure, and thus do not limit the patent scope of the present disclosure. Any person skilled in the present disclosure can make further improvements and changes on this basis without departing from the spirit and scope of the present disclosure. Therefore, the protection scope of this disclosure shall be subject to the scope defined by the claims of this application.

Industrial applicability

The fluid meter of the present disclosure can determine the direction of the fluid flow while measuring the flow rate of the fluid, so as to prevent the flow rate of the fluid from flowing back as a forward flow rate, thereby accurately obtaining the total flow rate of the fluid and reducing measurement errors. Therefore, it can be widely used for accurate fluid flow measurement of domestic water meters or industrial meters (oil meters, gas meters, etc.), and has industrial applicability.

Claims

A high-precision fluid meter includes a case, a watch core and a control circuit, which is characterized by:

The watch movement and the control circuit are arranged in the watch case;

The watch core includes: an impeller, an impeller shaft, and a fixed frame, the fixed frame is fixed in the watch case and connected to one end of the impeller shaft, and the impeller is disposed on the impeller shaft far from the fixed frame. At the other end, the plane where the fixing frame is located and the plane where the impeller is located are arranged in parallel on the impeller shaft, the fluid to be measured inside the case flows through the impeller, and the impeller is further provided with at least one magnet, Each of the magnets is fixedly disposed in the middle of the impeller, so that when the fluid to be measured impacts the impeller, the magnet rotates with the impeller;

The control circuit includes: a lithium battery, an induction coil, a first Hall sensor, a second Hall sensor, a display screen, a main control chip, a storage unit, an electromagnetic damping control circuit, and a wireless charging management circuit;

The lithium battery, the first Hall sensor, the second Hall sensor, the display screen, the storage unit, the electromagnetic damping control circuit, and the wireless charging management circuit are all related to the main control Chip electrical connection

The induction coil is electrically connected to the electromagnetic damping control circuit and the wireless charging management circuit, respectively;

The lithium battery is electrically connected to the wireless charging management circuit;

The induction coil, the first Hall sensor, and the second Hall sensor are all arranged on a fixed frame and each position corresponds to the position of the magnet on the impeller, so that when the impeller rotates , The induction coil generates the induced current to charge the lithium battery, and the first Hall sensor and the second Hall sensor are capable of detecting a change in a magnetic field generated by the magnet; wherein

The main control chip is further configured to determine a flow velocity and / or a direction of the fluid to be measured according to the magnetic field changes detected by the first Hall sensor and the second Hall sensor.
The high-precision fluid meter according to claim 1, wherein:

The high-precision fluid meter is a water meter, and the fluid to be measured is water.
The high-precision fluid meter according to claim 1 or 2, wherein:

The first Hall sensor and the second Hall sensor are set at a certain preset distance; and

The main control chip is further configured to determine a sequence in which the first Hall sensor and the second Hall sensor respectively detect a magnetic field, and determine a direction of the fluid to be measured according to the sequence.
The high-precision fluid meter according to any one of the preceding claims, wherein:

The main control chip is further configured to calculate a change rate of the magnetic field change detected by the first Hall sensor and / or the second Hall sensor, and determine the fluid to be measured according to the change rate. The flow rate.
The high-precision fluid meter according to any one of the preceding claims, wherein:

The impeller shaft is arranged vertically, the fixed frame is connected to the upper end of the impeller shaft, and the impeller is arranged at the lower end of the impeller shaft.
The high-precision fluid meter according to claim 5, wherein:

The rotation plane of the impeller is parallel to the traveling direction of the fluid to be measured.
The high-precision fluid meter according to any one of the preceding claims, wherein:

There are six blades of the impeller, and six magnets, and each of the magnets is disposed in the middle of a corresponding one of the blades.
The high-precision fluid meter according to claim 7, wherein:

The six magnets are arranged along the circumferential direction of the impeller in an arrangement manner in which the N and S poles are opposite to each other.
The high-precision fluid meter according to any one of the preceding claims, wherein:

The fixing frame is further provided with a first shielding cover and a second shielding cover, and the control circuit is disposed in the first shielding cover and the second shielding cover.
The high-precision fluid meter according to claim 9, wherein:

The first shield is made of iron; the second shield is made of aluminum or copper foil, and the first shield and the second shield are grounded in the watch case.
The high-precision fluid meter according to any one of the preceding claims, wherein:

Both the first Hall sensor and the second Hall sensor are bipolar Hall sensors.
The high-precision fluid meter according to any one of the preceding claims, wherein:

A power management circuit is also connected between the lithium battery and the main control chip.
The high-precision fluid meter according to any one of the preceding claims, wherein:

A temperature sensor is also connected to the main control chip.
The high-precision fluid meter according to any one of the preceding claims, wherein:

The main control chip is also connected with a valve body control circuit.
The high-precision fluid meter according to any one of the preceding claims, wherein:

The main control chip is also connected with a wireless communication circuit and an infrared communication circuit.
The high-precision fluid meter according to any one of claims 12 to 15, wherein:

The power management circuit further includes a trigger circuit portion; the trigger circuit portion is configured to:

When the impeller does not rotate or rotates less than a first predetermined rotation speed, the trigger circuit part controls the lithium battery to suspend supplying power to elements in the control circuit;

When the rotation speed of the impeller is greater than the first predetermined rotation speed, the trigger circuit part controls the lithium battery to supply power to the components in the control circuit again.
The high-precision fluid meter according to any one of the preceding claims, wherein:

The wireless charging management circuit further includes a circuit control switch; the circuit control switch is configured to:

When it is detected that the rotation speed of the impeller is less than a second predetermined rotation speed, the wireless charging management circuit is controlled to be disconnected, and the charging operation of the lithium battery is suspended.
The high-precision fluid meter according to claim 17, wherein:

The electromagnetic damping control circuit is further configured to control the lithium battery to apply a voltage to both ends of the electromagnetic damping control circuit when it is detected that the speed of the impeller is greater than a third predetermined speed, so as to facilitate the electromagnetic damping effect to slow down The impeller speed;

The third predetermined speed is greater than the second predetermined speed.
The high-precision fluid meter according to any one of the preceding claims, wherein:

The main control chip uses STM32L151RB.
The high-precision fluid meter according to any one of the preceding claims, wherein:

The magnet is a strip-shaped strong magnet.
The high-precision fluid meter according to any one of the preceding claims, characterized in that:

The water meter core and the control circuit are arranged in the water meter case;

The water meter core includes: an impeller, an impeller shaft, and a fixed frame. The impeller is disposed at one end of the impeller shaft. The fixed frame is disposed at the other end of the impeller shaft. The impeller shaft is arranged in parallel, and the impeller is further provided with strong magnetism, and the strong magnetism is arranged in the middle of the impeller;

The control circuit includes: a lithium battery, an induction coil, a first Hall sensor, a second Hall sensor, a display screen, a main control chip, a storage unit, an electromagnetic damping control circuit, and a wireless charging management circuit;

The lithium battery, the first Hall sensor, the second Hall sensor, the display screen, the storage unit, the electromagnetic damping control circuit, and the wireless charging management circuit are all related to the main control Chip connection

The induction coil is respectively connected to the electromagnetic damping control circuit and the wireless charging management circuit;

The lithium battery is connected to the wireless charging management circuit;

The induction coil, the first Hall sensor, and the second Hall sensor are all disposed on a fixed frame, and the positions of the induction coil, the first Hall sensor, and the second Hall sensor are all Corresponds to the position of the strong magnet on the impeller, and the strong magnet can cut the induction coil.
The high-precision fluid meter according to claim 21, wherein the impeller is six pieces, the strong magnetism is six, and the six strong magnetisms are N pole and S in the same direction of the impeller The poles are set alternately.
The high-precision fluid meter according to claim 21 or 22, wherein the fixed frame is further provided with a first shielding cover and a second shielding cover, and the control circuit is provided between the first shielding cover and Inside the second shielding case.
The high-precision fluid meter according to any one of claims 21 to 23, wherein the first shielding cover is made of iron sheet, and the second shielding cover is made of aluminum or copper foil, and The first shield cover and the second shield cover are grounded inside the water meter case.
The high-precision fluid meter according to claim 21, wherein the first Hall sensor and the second Hall sensor both use a bipolar Hall sensor.
The high-precision fluid meter according to claim 21, wherein a power management circuit is further connected between the lithium battery and the main control chip.
The high-precision fluid meter according to claim 21, wherein the main control chip is further connected with a temperature sensor.
The high-precision fluid meter according to any one of claims 21 to 27, wherein the main control chip is further connected with a valve body control circuit.
The high-precision fluid meter according to claim 21, wherein the main control chip is further connected with a wireless communication circuit and an infrared communication circuit.