Today I will introduce a national invention authorized patent-a smart water meter based on piezoelectric ceramic self-powered. The patent was applied by Fujian Tianrui Optoelectronics Co., Ltd., and was authorized to be announced on May 29, 2018.
Description of contentThe invention relates to the technical field of water meters, in particular to a smart water meter based on piezoelectric ceramic self-powered.
Background of the inventionIn daily life, water meters are installed and used in large quantities. With the advent of the 5G era, a large number of water meters need to be intelligently transformed, but due to the installation environment of water meters, most of them are far away from the mains and even belong to areas that are not easily accessible by the mains; at the same time, due to the access of the mains, additional Potential leakage hazard. Simply using the battery can solve the short-term power consumption, but it cannot solve the problem of long-term use. In response to the needs and application scenarios of smart water meters, the present invention uses the flow of water to impact the elastic metal sheet, thereby driving the piezoelectric ceramic membrane to periodically generate electricity to provide electrical energy for the control circuit, thereby solving the power supply problem of the smart water meter nearby, safely and simply.
In addition, the smart water meter also needs to continue to ensure the counting function of the water meter in the case of power failure. The invention adopts the position sensing technology of adding a resistance film, a magnetic stripe, a grating and the like on the counter of the conventional water meter, which can ensure the measurement accuracy and fairness of the water meter.
Summary of the inventionThe invention provides a smart water meter based on piezoelectric ceramic self-powered, which can effectively solve the problem of long-term monitoring and control power supply of the smart water meter, and has the advantages of simple structure, convenient installation, green environmental protection, economy and practicality.
The figure is the internal schematic diagram of the water meter of the present invention.
The technical scheme adopted by the present invention is as follows: a smart water meter based on piezoelectric ceramic self-powered, the smart water meter includes a control circuit, a storage battery, a piezoelectric ceramic power generation module, a water flow counter; the piezoelectric ceramic power generation module includes a water circuit provided in the water meter The elastic strip inside; one end of the elastic strip is fixed at the mounting seat of the power generation module, and the other end is suspended in the water meter waterway. The long side of the elastic strip is arranged at an angle to the direction of the water flow. The surface of the elastic strip is provided with a thin piezoelectric ceramic Layer, the electrical output of the piezoelectric ceramic thin layer is connected to the storage battery; when the elastic strip is deformed under the impulse of water flow, the electrical energy generated by the piezoelectric ceramic thin layer is output to the storage battery for storage; the storage battery controls the Circuit power supply; the water quantity counter is connected to the analog-to-digital conversion interface of the control circuit; the water quantity counter is connected to the water meter impeller by a counting mechanism. When the water pressure of the water meter pushes the impeller to rotate, the counting mechanism of the water counter is driven by the impeller to measure the water consumption.
The counting mechanism of the water counter stores the water consumption count value in a non-volatile data storage structure; the non-volatile data storage structure includes one of a resistance resistance position counting structure, a magnetic stripe position counting structure or a grating position counting structure Species. When the non-volatile data storage structure of the water counter is a resistance resistance position counting structure, the counter is connected to the analog-to-digital conversion interface of the control circuit through a resistance interface; the resistance interface includes a counting disc and a notched resistance ring; the resistance ring Adjacent to the outer circumference of the counting disc, the analog-to-digital conversion interface of the control circuit is connected to the counting disc with a first contact; the analog-to-digital conversion interface is connected to the resistance ring with a second contact via a wire; the counting disc is connected to the impeller; When the counting disc rotates under the impeller drive, the second contact slides at the resistance ring to change the resistance value of the resistance interface. The control circuit determines the current water consumption according to the resistance value of the resistance interface of the water volume counter.
The elastic strip is a metal elastic sheet or an elastic plastic sheet; when the elastic strip is a metal elastic sheet, the surface layer of the elastic strip is a surface layer formed by waterproof treatment. The power generation module includes a fixed ring and a fixed cross bar traversing the fixed ring. The fixed ring is fixed to the water meter outlet at a spiral structure; the fixed cross bar is provided with an elastic band fixing hole; when the elastic band is fixed to the elastic band When the hole is used, the elastic strip forms an angle with the direction of the water flow between 0 and 30 °. The piezoelectric ceramic thin layer is arranged on the upper surface and / or the lower surface of the elastic strip. When the water in the water meter flows, the elastic strip impacts the elastic strip to periodically bend and deform, so that at least one piezoelectric ceramic thin layer is deformed under pressure to generate electrical energy ; The surface of the thin layer of piezoelectric ceramic is covered with waterproof material. The smart water meter also includes a solenoid valve provided at the water inlet of the water meter. The solenoid valve is connected to the control circuit to open or cut off the water circuit according to the control instruction.
The control circuit has a built-in microprocessor; the control circuit includes a card reading circuit and a communication circuit. When the smart water meter reads the water fee card to control the user's water use, and the solenoid valve is a normally open solenoid valve, its workflow includes the following steps in sequence: A1. The user opens the faucet to form a water flow in the water meter waterway, and the power generation module Generate electricity and charge the storage battery; A2. When the power of the storage battery can drive the control circuit, the control circuit compares the available water volume data stored in the storage chip in the control circuit with the current water consumption recorded by the water volume counter To determine whether the user can continue to use water; A3. When the control circuit determines that the current water consumption is greater than the available water consumption data, the control circuit controls the solenoid valve to cut off the water meter waterway; A4. When the user charges the card with the recharged water fee card at the control circuit , The control circuit updates the available water quantity data stored in the storage chip according to the water fee card data, and controls the solenoid valve to turn on the water meter water channel so that the user can use water normally; For the control circuit to read, when the current water consumption read by the control circuit again exceeds the storage of the control circuit storage chip When the available water volume data, the control circuit controls the solenoid valve to cut off the water meter water circuit.
The invention uses the flow of the water body in the water meter to impact the elastic metal strip, thereby driving the piezoelectric ceramic thin layer periodic deformation to generate electrical energy. The electrical energy is stored in the storage battery to provide electrical energy for the control circuit, so that the intelligence is nearby, safe and simple. Water meter power supply problem.
In the present invention, the water counter is connected to the analog-to-digital conversion interface of the control circuit; the water counter is connected to the impeller of the water meter with a counting mechanism. When the water pressure of the water meter pushes the impeller to rotate, the counting mechanism of the water counter is driven by the impeller to measure the water consumption. In practical applications, the counter can have multiple counting discs corresponding to the multi-bit water meter to expand the range. The disc is equipped with a resistance film (resistance ring or resistive layer), magnetic stripe, grating and other position sensors. The control circuit needs Time to read the count value through the position Sensor. Obviously, the intelligent transformation of the existing water meter of the present invention can not affect the counting and measuring function of the existing water meter, and continue to ensure the accuracy and fairness of the water meter measurement in the case of power failure and power outage.
The control circuit of the present invention has a built-in communication circuit, which can send the current water meter count and measurement results, working status and other information externally with or without timing; the external data status transmission function can also be triggered by other conditions. So as to realize the intelligent networking, intelligent billing, intelligent management and other functions of the intelligent water meter.
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