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Patent - Industrial and commercial large flow remote transmission gas meter based on MEMS Thermal Flow Sensor

Abstract: an industrial and commercial large flow remote transmission gas meter based on MEMS thermal flow sensor. The patent was applied by Chongqing Qianwei CROM watch Co., Ltd. and was authorized to announce on June 20, 2017 that it realized the analysis of unknown pollutants in recycled plastics

unlimited creativity, great invention of instruments. Today, I will introduce to you a national invention authorized patent - a large flow industrial and commercial remote transmission gas meter based on MEMS thermal flow sensor. The patent was applied by Chongqing Qianwei CROM watch Co., Ltd. and was authorized and announced on June 20, 2017

content description

the utility model relates to the technical field of gas meters, specifically an industrial and commercial large flow remote transmission gas meter based on MEMS thermal flow sensor

background of invention

with the development of science and technology, the method of payment by network is gradually popularized, which has a profound impact on all aspects of our life. In the process of gas use, which is closely related to people's lives, the traditional manual or partial automatic meter reading method is not used for meter reading statistics, that is, single payment, or IC card prepayment. Using IC card prepayment requires a large number of IC card recharge points, and due to the limitations of IC card itself, it is impossible to effectively collect operation records and recharge records; Using the traditional manual or partial automatic meter reading method requires a lot of manpower and material resources. If using the real-time meter reading system, it also requires a lot of material resources, and it is unable to maintain the gas meters in use in time, causing inconvenience to the life of gas users and production losses

content of the invention

in view of the shortcomings in the existing technology, the purpose of the utility model is to provide a remote gas IOT self-service meter reading and self paying gas meter that can realize self-service meter reading or self-service prepayment for civil and enterprise gas users by using interconnection, IOT, low-power wireless, big data cloud computing and cloud storage, To replace the traditional manual meter reading and IC recharge management of civil gas meters and enterprise gas meters

patent - Industrial and commercial large flow remote transmission gas meter based on MEMS Thermal Flow Sensor

the figure is the circuit diagram of the flowmeter port jp5 of the utility model

in order to achieve the above purpose, the utility model adopts the following technical scheme: an industrial and commercial large flow remote transmission gas meter based on MEMS thermal flow sensor, including a shell, which is equipped with a material light as smoke, a display panel, and a control circuit A ventilation pipe and a bypass pipe connected with the ventilation pipe. The two ends of the ventilation pipe are provided with an air inlet connector and an air outlet connector. The bypass pipe is provided with a thermal flow sensor. The control circuit includes a flow acquisition module for collecting the gas flow, a communication module for communicating with the flow acquisition module and using the GPRS communication module in the SIM card to realize data communication with the data terminal

the communication module includes communication chips U2 and U5, the communication module U2 is used to communicate with the acquisition module to measure the flow, and the communication chip U5 and the communication chip U2 are connected by the flowmeter port jp5; At the same time, the flowmeter port jp5 is connected with 485 serial port circuit to prevent unstable flow measurement; The communication chip U5 is electrically connected with an identification circuit for identifying the GPRS communication module in the SIM card

the fourth pin of the flowmeter port jp5 is electrically connected with the 52nd pin of the communication chip U2 and the 560th pin of the communication chip U5; The third pin of the flowmeter port jp5 is electrically connected with the 53rd pin of the communication chip U2 and the 59th pin of the communication chip U5; The first pin of the flowmeter port jp5 is electrically connected with the fourteenth pin of the communication chip U5 to control the on-off of the flowmeter; The second pin of flowmeter port jp5 is grounded; Resistors R30 and R29 are electrically connected between the fourth pin of the flowmeter port jp5 and the 52nd and 53rd pins of the communication chip U2

it also includes a clock control circuit and a three terminal regulated power supply circuit electrically connected with the communication chip U5 to determine the upload time of flow data; The clock control circuit comprises a clock chip U8, the first pin of which is electrically connected with the 35th pin of the communication chip U5 and the sixth pin of the voltage stabilizing chip u9 of the three terminal voltage stabilizing power supply circuit; The fourth pin of the clock chip U8 is electrically connected with the 34th pin of the communication chip U5 and the fifth pin of the voltage stabilizing chip u9; The first, second, third, fourth and seventh pins of the voltage stabilizing chip u9 are grounded; The eighth pin of voltage stabilizing chip u9 is connected to capacitor C31 and then grounded

in addition, it also includes a switching power supply circuit DC-DC electrically connected to the communication chip U5. In addition, it also includes a debugging and detection circuit placed in the shell. The debugging and detection circuit includes resistors R7 and R8 in parallel. The input terminals of resistors R7 and R8 are electrically connected with the power supply 3v3. The resistor R7 is connected with capacitor C13 and switch SW1 in parallel, the resistor R20 is connected with capacitor C15 and switch SW1 in parallel, and the output terminals of capacitor C7, switch SW1, capacitor C8 and switch SW2 are grounded

specifically, the 485 serial port circuit includes transceiver U1, interface converter J2, resistors R1, R2, R3, R4, R5, R6 and capacitors C3, C8 and C9. The first pin of transceiver U1 is electrically connected with one end of resistor R4, the other end of resistor R4 is connected with one end of parallel resistors R1 and R2, the other end of resistor R1 is grounded, the other end of resistor R2 is connected with communication modules U2 and jp5, and the seventh pin of transceiver U1 is connected with one end of resistor R3, The other end of resistor R3 is connected with capacitor C8 and the second pin of interface converter J2; The sixth pin of transceiver U1 is connected with one end of resistor R6, and the other end of resistor R6 is connected with capacitor C9 and the third pin of interface converter J2; The fifth and eighth pins of transceiver U1 are grounded, and capacitor C3 is connected to the eighth pin of transceiver U1

further, the model of the communication chip U2 is msp430f4152. The model of the communication chip U5 is efm32tgf32

compared with the existing technology, the utility model has the beneficial effects of increasing the order amount from non manufacturing industry to 114.4% in the same month of last year: accurate measurement, convenient use, making full use of mobile Internet, IOT, big data cloud computing and cloud storage, realizing self-service meter reading, payment, prepaid recharge, user repair, instrument remote detection and professional services, Instead of the traditional manual or partial automatic meter reading method for meter reading statistics and IC prepayment of energy consumption, it effectively saves a lot of human and material resources and facilitates gas users