CN103471654A - Self-power-supply water flow monitoring system - Google Patents

Abstract

The invention discloses a self-powered water flow monitoring system, which includes a water pipe, a water flow generator, a flow detection module, an energy collection chip, a power storage module, a boost circuit, a single-chip microcomputer, and a liquid crystal screen; the water pipe is sequentially connected to the water flow generator and A flow detection module, the output end of the water flow generator is connected to the single-chip microcomputer through the energy collection chip, the power storage module, and the boost circuit in sequence, the output end of the flow detection module is connected to the single-chip microcomputer, and the output end of the single-chip microcomputer is connected to the LCD screen. The invention generates power through the fluid energy in the water pipe, and designs and realizes an intelligent, self-powered water consumption monitoring system, which has functions such as flow monitoring, billing display, temperature measurement, and Bluetooth transmission. The invention has the characteristics of energy saving, environmental protection and intelligent management, and can make the network management composed of multiple flow monitoring nodes more networked, intelligent and modernized.

Description

Self powered water flow monitoring system

technical field

The invention discloses a self-powered water flow monitoring system, which belongs to a water flow detection and control device.

Background technique

In the water supply system, in order to achieve the purposes of water billing, water pressure monitoring and other purposes, the monitoring of water flow is a necessary work. The realization of energy saving of self-powered systems has been studied in many fields at home and abroad, and the fields involve a wide range. At the same time, the country is increasingly advocating energy conservation, emission reduction, and environmental protection. In the prior art, systems or devices for monitoring water flow often require an additional power supply system, which cannot effectively save energy.

Contents of the invention

The technical problem to be solved by the present invention is to design and realize an intelligent and self-powered water consumption monitoring system by generating electricity through the fluid energy in the water pipe, which has functions such as flow monitoring, billing display, temperature measurement, and Bluetooth transmission.

The present invention adopts the following technical solutions for solving the problems of the technologies described above:

A self-powered water flow monitoring system, comprising a water pipe, a water flow generator, a flow detection module, an energy collection chip, a power storage module, a boost circuit, a single-chip microcomputer, and a liquid crystal screen; the water flow generator and the flow detection module are sequentially connected to the water pipe Above, the output end of the water flow generator is connected to the single-chip microcomputer through the energy collection chip, the power storage module, and the boost circuit in sequence, the output end of the flow detection module is connected to the single-chip microcomputer, and the output end of the single-chip microcomputer is connected to the LCD screen.

Further, the single-chip microcomputer is also connected with a temperature sensor, and the model of the temperature sensor is DS18B20.

Further, the output end of the single-chip microcomputer is also connected with a bluetooth sending module.

Further, the power storage module is a 3.7V lithium battery.

Further, the energy-collecting chip adopts LM2575 chip.

Further, the flow detection module realizes the judgment of the flow rate by detecting the frequency pulse signal of the turbine rotation.

Compared with the prior art, the present invention adopts the above technical scheme and has the following technical effects: the present invention has the characteristics of energy saving, environmental protection and intelligent management, and can make the network management composed of multiple flow monitoring nodes more networked and intelligent ,modernization.

Description of drawings

Fig. 1 is a schematic diagram of connection of system modules of the present invention.

Fig. 2 is a schematic diagram of the connection of the energy-collecting chip LM2575 in the present invention,

Among them: 1. Vin input voltage, 2. output terminal, 3. ground terminal, 4. feedback terminal, 5. switch.

Fig. 3 is the control diagram of the single-chip microcomputer of the present invention.

Fig. 4 is a schematic diagram of the pressure-flow relationship in the experimental data of the present invention,

Among them: the dotted line represents the result of the first test, the straight line represents the result of the second test, and the dotted line represents the result of the third test.

Fig. 5 is flow-output voltage relation schematic diagram in the experimental data of the present invention,

Among them: the dotted line represents the result of the first test, the straight line represents the result of the second test, and the dotted line represents the result of the third test.

Detailed ways

The invention uses a water flow generator to convert the mechanical energy of the fluid in the water pipe into electrical energy, and through the energy collecting chip and the voltage stabilizing circuit, the voltage is stabilized to 5V to charge the lithium battery. The lithium battery has relatively high energy, long service life and high self-discharge rate. Low cost, green environmental protection and other advantages. The lithium battery used in this work is a 3.7V lithium battery, so a boost circuit is needed to boost the voltage to 5V to power the microcontroller. The flow monitoring uses the frequency pulse signal of the turbine rotation to realize the judgment of the flow rate. The temperature sensing part is realized by using the DS18B20 temperature sensor. The Bluetooth module is used to send the flow, temperature, billing and other information to the PC. end.

Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

As shown in Figure 1, the water pipes are sequentially connected to the water flow generator and the flow detection module, the output of the water flow generator is connected to the single-chip microcomputer through the energy collection chip, the power storage module, and the boost circuit in turn, and the output of the flow detection module is connected to the single-chip microcomputer. The output terminal of the single-chip microcomputer is connected with the LCD screen. The single-chip microcomputer is also connected with a temperature sensor, and the model of the temperature sensor is DS18B20. The output end of the single-chip microcomputer is also connected with a bluetooth sending module.

The connection diagram of the energy-collecting chip LM2575 is shown in Figure 2. The input voltage range is 7V to 40V. The input pin 1 is connected to an appropriate capacitor to the ground as the input; the output pin 2 needs to be connected to a diode and an inductor as a peripheral circuit component, and at the same time it is fed back to pin 4. . Finally, a stable output of 5V is obtained to supply power to the microcontroller. The LM2575 series switching voltage regulator integrated circuit is a 1A integrated voltage regulator circuit produced by National Semiconductor Corporation of the United States. The volume of the heat sink is small, and no heat sink is required in most cases; there is a complete protection circuit inside, including current limiting and thermal shutdown circuits. The chip can provide external control pins, which is an ideal substitute for traditional three-terminal voltage regulator integrated circuits.

The power generation module adopts a non-reluctance high-efficiency generator and water-electricity separation technology, a unique dual-magnetic circuit coupling clutch, and its volume is only 4/5 of that of an ordinary micro-hydraulic generator. It can also be started smoothly when the load is short-circuited. It has a very high cost performance. Operating water pressure: 0.08~0.45 MP Output voltage: 9.8~18.5VDC/no load, 8.8~15VDC/0.1 K load Output current: 128~260 MA/0.1 K load, flow loss: 3.6% (at 0.25 MP).

As shown in Figure 3, this simulation is mainly a simulation of detecting water flow and temperature. The emulator comes with a 18b20 simulation model, and the 18b20 driver is written inside the microcontroller to realize single-bus data reading, and then the temperature is displayed on the 1602 LCD screen. According to the principle that the Hall element works to generate a square wave, a signal generator is used to simulate the generation of a square wave. The single-chip microcomputer collects the number of square waves, converts them into flow rates through function operations, and displays them on the LCD screen.

The relationship between pressure, output voltage and flow rate is shown in Figure 4 and Figure 5:

As shown in Figure 4, the relationship between flow and pressure is basically proportional, and the working pressure increases with the increase of flow. According to the data obtained from the three tests, the relational formula that can be fitted is as follows:

Water flow rate Q (L/min)

The relationship between power generation voltage and flow rate is approximately: V=C0*Q (C0=1.236).

As shown in Figure 5, the output voltage and the flow rate are basically in a linear relationship between 1 L/min and 2 L/min, and the output voltage increases with the increase of the flow rate, while in the range where the flow rate is greater than 3 L/min, the change of the flow rate is almost Does not cause changes in the output voltage, the output voltage is stable at 5V. The relationship of the linear part is as follows:

Flow pulse characteristics F=C1*Q-C2

(C1=7.5, C2=3 obtained by curve fitting of actual measurement).

The actual measurement experiment is divided into two types: using a bucket as the water source and using tap water as the water source. The experimental results are as follows:

1. When the bucket is lifted to different heights, the water flow rate is different, and the voltage value on the LCD screen also changes accordingly. The specific data are as follows:

Height/m Flow rate l/min Flow pulse F/hz output voltage/v 0.8 1.3 4.2 1.8 1.5 2.2 11.4 3.3 2 3.4 20.0 3.8 3 4.8 26.7 5.6

Since the water flows down from the bucket, the output voltage is relatively small;

2. The water pipe is directly connected to the faucet to ensure that the water flow rate is relatively large and a large output voltage can be obtained. When the faucet is opened to different degrees, the water flow rate is different, and the voltage value on the LCD screen also changes accordingly. The specific data are as follows:

water tap level output voltage/v Small 5.2 middle 10.5 big 18.2

The output voltage meets the design requirements.

Claims (6)

1. a self-powered discharge monitoring system, is characterized in that: comprise water pipe, water flow generator, flow detection module, energy collecting chip, electric power storage module, booster circuit, single-chip microcomputer, liquid crystal display; Described water flow generator and flow detection module are connected in turn on water pipe, the output terminal of described water flow generator is connected to single-chip microcomputer through energy collecting chip, electric power storage module, booster circuit successively, the output terminal of flow detection module is connected to single-chip microcomputer, and the output terminal of single-chip microcomputer is connected with liquid crystal display.

2. a kind of self-powered discharge monitoring system as claimed in claim 1, it is characterized in that: also comprise the temperature sensor be connected with single-chip microcomputer, the model of described temperature sensor is DS18B20.

3. a kind of self-powered discharge monitoring system as claimed in claim 1, it is characterized in that: the output terminal of single-chip microcomputer also is connected with the bluetooth sending module.

4. a kind of self-powered discharge monitoring system as described as any one in claims 1 to 3, it is characterized in that: described electric power storage module is the 3.7V lithium battery.

5. a kind of self-powered discharge monitoring system as described as any one in claims 1 to 3, is characterized in that: described energy collecting chip employing LM2575 chip.

6. a kind of self-powered discharge monitoring system as described as any one in claims 1 to 3 is characterized in that: described flow detection module realizes the judgement of uninterrupted by the frequency pulse signal of detecting turbine rotation.

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