Ultrasonic heat meter design

Abstract: ultrasonic heat meter design information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. The working principle of ultrasonic heat meter and temperature difference power generation system of system 1. The working principle of ultrasonic heat meter ultrasonic heat meter is added on the basis of ultrasonic flowmeter temperature sensor to realize the measurement of temperature, through measure and supply and fluid flow. More flow meter manufacturers choose model price quote you are welcome to inquire, is ultrasonic heat meter design article details below. The working principle of ultrasonic heat meter and temperature difference power generation system of system 1. The working principle of ultrasonic heat meter ultrasonic heat meter is added on the basis of ultrasonic flowmeter temperature sensor to realize the measurement of temperature, through measure the flow of fluid and supply and return water temperature to calculate the heat to users. When water flow through the heat exchange system, according to the flow sensor to measure the flow rate and temperature sensor to measure the water supply temperature, backwater temperature, as well as the TDC - GP22 stream of measured by time, and this system is obtained through the calculation of the CPU can absorb or release the heat. Because after heat exchange system of water quality in practical application are obtained by measuring the volume of water, so the calculation method of heat value is used mostly European popular k coefficient method, the mathematical expressions such as type ( 1) As shown in ( 1) To absorb or release heat type, Q, J; V for the heat transfer fluid flowing through the volume, m3. Δ θ For the heat transfer loop for return water temperature difference of heat transfer fluid, ℃; For heat transfer coefficient k, it is a heat transfer fluid in the corresponding function under the pressure, temperature and temperature difference. 2. Thermoelectric power generation system of systems of temperature difference power generation can also be called thermal, is through the seebeck effect of thermal energy and electric energy conversion between. Water temperature and room temperature when the pipe is a certain temperature, temperature difference generator can generate dc voltage on both ends of the piece, high reliability, when the temperature difference is 1 ℃ to produce a voltage of 70 mv. Temperature difference power generation system functional block diagram as shown in figure 1. Based on the model for TEC112706 power generation, heat source through semiconductor power converts heat into the weak voltage signal, due to the low voltage signal voltage, at the same time also mingled with the interference signal, therefore, cannot be used directly heating scale. The voltage signal through the booster DC - DC booster circuit, relatively stable after the rectifier output voltage, can be directly use ultrasonic heat meter. Because of the separated type ultrasonic heat meter USES is dormant work mode, most of the time is in LPM3 mode, namely dormant, low power consumption, temperature difference power generation system to produce power not only satisfy the use of heat meter, and excess capacity can be stored in the energy storage element. When MSP430F4371 single-chip microcomputer in the AM mode, flow and temperature information acquisition or verification status, starting fast clock large power consumption, when the conversion of electricity shortage, the release of the energy storage components will be stored electricity, heat added to table use. Heat power generation system function diagram in figure 1 temperature difference table temperature difference generator power supply system in the hardware circuit of ultrasonic heat meter MSP430F4371 MCU and clock chip TDC - GP22 electricity mainly comes from two parts: 3. 6 v, 2200 ma· H of the rechargeable lithium battery and temperature difference power generation systems. Lithium battery for heat meter power supply together with the temperature difference power generation systems. When the temperature difference power generation power enough, meet the demand of hot work table power supply at the same time can also be extra electricity stored in rechargeable lithium batteries. Smaller, when the temperature difference in the test state for long, or LCD screen, starting temperature will produce under the condition of insufficient power supply, lithium battery as the main power supply, to make up for the inadequacy of thermoelectric power generation. Heat meter power supply circuit diagram is shown in figure 2. In figure 2 heat meter power supply circuit tutu 2 R4, R5 as a current limiting resistor. Resistor R2, R3 connect internal comparator is used to constitute A voltage detecting module. The comparator is composed of analog input, A comparator core, low-pass filter, A reference voltage part and interrupt these five parts. Through setting the external analog input voltage with the internal software, comparing the reference voltage used to determine voltage of the system and to monitor the system voltage. Low frequency filter capacitor C7 is used to reduce the output ripple voltage, high frequency filter capacitance C9 and C10 to improve the transient response of the load. BTIBattery is 3. 6 v lithium-ion batteries, used as a system is the main power supply. VCC1 and VCC2 voltage stabilizer AME8800 will be 3. 6 v voltage into 3. 3 v, is used to TDC - GP22 chips and MSP430F4371 MCU power supply. When the temperature difference power generation has a certain temperature difference on both ends of the piece, its two ends can produce a dc voltage signal. The signal after capacitor filter out high frequency signal Cin, via a step-up transformer coil into the LTC3108 SW port 1, self-excited oscillation by chip internal N channel signals, thus signal into a dc ac signal booster. Booster after electricity flowing through the capacitor C1 into the internal rectifier LTC3108-1 start charging and charge pump, and then through the Vout port output. When the voltage of the Vaux greater than 2. 5 v, Vout port to Cout charging.

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