Ultrasonic gas meter

Abstract

The utility model provides an ultrasonic gas meter which comprises an infrared interface circuit, an ultrasonic flow channel control circuit, a cover opening detection circuit, a gas meter processor, a valve control circuit, a display screen and a key circuit. The gas meter processor is connected with the infrared interface circuit, the ultrasonic flow channel control circuit, the uncovering detection circuit, the valve control circuit, the display screen and the key circuit. According to the gas meter, the metering accuracy is improved, the mechanical structure of the gas meter is simplified, and meanwhile the reliability of the gas meter is improved.

Description

TECHNICAL FIELD

[0001] The utility model mainly relates to gas equipment technical field, concretely relates to an ultrasonic gas meter. BACKGROUND

[0002] With the improvement of people's living standards and the enhancement of environmental protection consciousness, the daily cooking fuel is changed from the conventional energy of wood, coal and other resources with serious waste and heavy pollution into clean energy such as natural gas and coal gas. As a metering tool for gas consumption, the automatic accumulation function of the gas meter is convenient for users to know the gas consumption and payment, and is crucial in the gas supply system.

[0003] At present, the conventional gas meter is a skin film type gas meter. However, the mechanical structure of the skin film type gas meter is complex, and the measurement accuracy is poor. After long-term use, the internal skin film is easy to age and wear, resulting in measurement deviation and slow metering, which brings loss of supply and marketing difference to the gas company. The skin film type gas meter needs to be placed flat and vertically during installation. If the inclination angle exceeds 30°, it may not be measured at a small flow rate (such as a single stove eye to simmer). The larger the angle, the more serious the non-measurement, and even the illegal user may steal gas by "bending the meter", and it is not easy to leave evidence, thus resulting in poor reliability of the skin film type gas meter. SUMMARY

[0004] The utility model solves the technical problems in the prior art and provides an ultrasonic gas meter, which can solve the problems of poor measurement accuracy and poor reliability.

[0005] The technical solution for solving the above technical problems is as follows: an ultrasonic gas meter, comprising an infrared interface circuit for transmitting and receiving infrared data, an ultrasonic flow channel control circuit for analyzing the gas flow direction of imported temperature data and pressure data and controlling the ultrasonic flow channel transducer to transmit and receive ultrasonic data, an uncovering detection circuit for detecting whether the gas meter shell is illegally opened according to a preset detection rule and obtaining a detection result after detection, a gas meter processor for analyzing data of the infrared data, the detection result and the gas flow direction analysis result, a valve control circuit for controlling the opening and closing of the gas meter valve according to the result of data analysis, a display screen and a key circuit for controlling the display screen through the gas meter processor,

[0006] The gas meter processor is connected with the infrared interface circuit, the ultrasonic flow channel control circuit, the uncovering detection circuit, the valve control circuit, the display screen and the key circuit respectively.

[0007] The utility model discloses beneficial effect is: through gas meter treater, infrared interface circuit, ultrasonic flow channel control circuit, uncovering detection circuit, valve control circuit, display screen and button circuit improve the measurement accuracy, and simplify the mechanical structure of gas meter, also improve the reliability of gas meter.

[0008] On the basis of the above technical scheme, the utility model still can make following improvement.

[0009] Further, the ultrasonic flow channel control circuit comprises an ultrasonic processor, a socket, an ultrasonic flow channel control indicator light and a card seat,

[0010] The ultrasonic processor is connected with the gas meter treater through the socket, and the ultrasonic processor is connected with the ultrasonic flow channel control indicator light and the card seat respectively,

[0011] The ultrasonic processor comprises an L660XL chip, an IPEX antenna seat, first resistance, second resistance, third resistance, fourth resistance, fifth resistance, sixth resistance, seventh resistance, eighth resistance, ninth resistance, tenth resistance, first transistor, second transistor, first electrolytic capacitor, first capacitor, second capacitor, third capacitor, fourth capacitor, fifth capacitor, sixth capacitor, seventh capacitor, eighth capacitor, ninth capacitor, tenth capacitor, eleventh capacitor, twelfth capacitor, first ESD protection diode, second ESD protection diode, third ESD protection diode, fourth ESD protection diode and fifth ESD protection diode,

[0012] The first GND pin of the L660XL chip is grounded, the USIM GND pin of the L660XL chip is connected with the card seat, the USIM DATA pin of the L660XL chip is connected with one end of the first resistor, the other end of the first resistor is connected with one end of the first ESD protection diode, one end of the first capacitor and the card seat respectively, the USIM_RST pin of the L660XL chip is connected with one end of the second resistor, the other end of the second resistor is connected with one end of the second ESD protection diode, one end of the second capacitor and the card seat respectively, the USIM_CLK pin of the L660XL chip is connected with one end of the third resistor, the other end of the third resistor is connected with one end of the third ESD protection diode, one end of the third capacitor and the card seat respectively, the USIM_VDD pin of the L660XL chip is connected with one end of the fourth ESD protection diode, one end of the fourth capacitor, one end of the fifth capacitor and the card seat respectively, the other end of the first ESD protection diode, the other end of the first capacitor, the other end of the second ESD protection diode, the other end of the second capacitor, the other end of the third ESD protection diode, the other end of the third capacitor, the other end of the fourth ESD protection diode, the other end of the fourth capacitor and the other end of the fifth capacitor are all grounded, the RESET pin of the L660XL chip is connected with the socket, the NET_STATE pin of the L660XL chip is connected with the ultrasonic flow channel control indicator lamp, the UART_RXD pin of the L660XL chip is connected with one end of the fourth resistor and the collector of the first transistor respectively, the other end of the fourth resistor and one end of the fifth resistor are connected with the power supply VDD-1.8, the other end of the fifth resistor is connected with the base of the first transistor, the emitter of the first transistor is connected with one end of the sixth resistor and the socket respectively, the other end of the sixth resistor is connected with the power supply L660_VCC, the UART_TXD pin of the L660XL chip is connected with one end of the seventh resistor and the emitter of the second transistor respectively, the other end of the seventh resistor is connected with one end of the eighth resistor and the base of the second transistor respectively, the other end of the eighth resistor is connected with the power supply VDD-1.8 is connected, the collector of the second transistor is connected with one end of the ninth resistor and the socket respectively, the other end of the ninth resistor is connected with power supply L660_VCC, the WAKEUP_IN pin of the L660XL chip is connected with the socket, the VDD_EXT pin of the L660XL chip is connected with one end of the sixth capacitor, the other end of the sixth capacitor is grounded, the second GND pin of the L660XL chip and the third GND pin of the L660XL chip are both grounded, the ANT_RF pin of the L660XL chip is connected with one end of the tenth resistor and one end of the seventh capacitor respectively, the other end of the seventh capacitor is grounded, the other end of the tenth resistor is connected with one end of the eighth capacitor, one end of the fifth ESD protection diode and one end of the IPEX antenna seat respectively, the other end of the eighth capacitor is grounded, the other end of the fifth ESD protection diode is grounded, the other end of the IPEX antenna seat is grounded, the fourth GND pin of the L660XL chip and the fifth GND pin of the L660XL chip are both grounded, the DBG_RXD pin of the L660XL chip and the DBG_TXD pin of the L660XL chip are both connected with the socket, the sixth GND pin of the L660XL chip and the seventh GND pin of the L660XL chip are both grounded, the first VBAT pin of the L660XL chip and the second VBAT pin of the L660XL chip are both connected with power supply L660_VCC, one end of the first electrolytic capacitor, one end of the ninth capacitor, one end of the tenth capacitor, one end of the eleventh capacitor and one end of the twelfth capacitor are all connected with power supply L660_VCC, the other end of the first electrolytic capacitor, the other end of the ninth capacitor, the other end of the tenth capacitor, the other end of the eleventh capacitor and the other end of the twelfth capacitor are all grounded.

[0013] The beneficial effects of the further scheme are: improving the measurement accuracy, simplifying the mechanical structure of the gas meter, and improving the reliability of the gas meter.

[0014] Further, the gas meter processor includes an FM33FR058 chip, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a thirteenth capacitor, a fourteenth capacitor, a fifteenth capacitor, a sixteenth capacitor, a seventeenth capacitor, a first interface and a second interface,

[0015] The PA1 / TO04 / TI04 / COMP2_INN / LUT2_OUT pin of the FM33FR058 chip is connected with the key circuit, the PA3 / SWCLK / UART3_RX pin of the FM33FR058 chip is connected with the first pin of the first interface and one end of the eleventh resistor respectively, the PA4 / SWIO / UART3_TX pin of the FM33FR058 chip is connected with the second pin of the first interface and one end of the twelfth resistor respectively, the third pin of the first interface, the other end of the eleventh resistor and the other end of the twelfth resistor are connected with the power supply VDD, the fourth pin of the first interface is grounded, the PA7 / SEG39 / LED_DIG21 / FOUT1 pin of the FM33FR058 chip is connected with the key circuit, the PA9 / XTHFO pin of the FM33FR058 chip is connected with the cover detection circuit, the REGC pin of the FM33FR058 chip is connected with one end of the thirteenth resistor, the other end of the thirteenth resistor is connected with one end of the thirteenth capacitor, the VSS pin of the FM33FR058 chip, the VSSA pin of the FM33FR058 chip, the other end of the thirteenth capacitor, one end of the fourteenth capacitor and one end of the fifteenth capacitor are grounded, the VDDA pin of the FM33FR058 chip, the VDD pin of the FM33FR058 chip, the other end of the fourteenth capacitor and the other end of the fifteenth capacitor are connected with the power supply VDD, the PB0 / UART3_RX / SCLA0 pin of the FM33FR058 chip is connected with the first pin of the second interface and one end of the fourteenth resistor respectively, the PB1 / UART3_TX / SDAA0 pin of the FM33FR058 chip is connected with the second pin of the second interface and one end of the fifteenth resistor respectively, the other end of the fourteenth resistor and the other end of the fifteenth resistor are connected with the power supply VDD, the third pin of the second interface is grounded, the PB2 / WKUP2 / SEG40 / UART4_RX / SCLA1 pin of the FM33FR058 chip, the PB3 / SEG41 / UART4_TX / SDAA1 pin of the FM33FR058 chip, the PB6 / COM0 / LED_SEG0 / TI11 / TO11 pin of the FM33FR058 chip, the PB7 / COM1 / LED_SEG1 / TI02 / TO02 pin of the FM33FR058 chip, the PB8 / COM2 / LED_SEG2 / TI13 / TO13 pin of the FM33FR058 chip, the PB9 / COM3 / LED_SEG3 / UART0_TX pin of the FM33FR058 chip,the FM33FR058 chip’s PB10 / COM4 / SEG28 / LED_SEG4 / UART0_RX pin, the FM33FR058 chip’s PB11 / COM5 / SEG29 / LED_SEG5 / TI12 / TO12 / SMB0_ALERTB pin, the FM33FR058 chip’s PE0 / SEG4 / TS00 / LED_DIG4 / SPI0_SCK / SCL1 pin, the FM33FR058 chip’s PE1 / SEG5 / TS01 / LED_DIG5 / SPI0_SSN / TI06 / TO06 pin, the FM33FR058 chip’s PE2 / SEG6 / TS02 / LED_DIG6 / SPI3_SSN / TI05 / TO05 pin, the FM33FR058 chip’s PE3 / SEG7 / TS03 / LED_DIG7 / SCL2 / SPI3_SCK / LPT16_CH1 pin, the FM33FR058 chip’s PE4 / SEG8 / LED_DIG8 / TS04 / SDA2 / SPI3_MISO / LPT16_CH2 pin, the FM33FR058 chip’s PE5 / SEG9 / LED_DIG9 / SPI3_MOSI pin, the FM33FR058 chip’s PE6 / SEG10 / LED_DIG10 / SPI2_MOSI pin, the FM33FR058 chip’s PE7 / SEG11 / LED_DIG11 / SPI2_MOSI pin, the FM33FR058 chip’s PE8 / SEG12 / LED_DIG12 / SCL3 / SPI2_SCK / COMP1_OUT pin, the FM33FR058 chip’s PC0 / SEG13 / LED_DIG13 / SPI3_SCK / COMP2_OUT pin, the FM33FR058 chip’s PC3 / SEG16 / TS05 / ATIM_CH3 (TI02) (TO02) / SPI2_SCK / SCL0 pin, the FM33FR058 chip’s PC4 / SEG17 / TS06 / UART2_RX / ATIM_CH4 (TI03) (TO03) / SPI2_MISO / SDA0 pin, the FM33FR058 chip’s PC5 / SEG18 / UART2_TX / ATIM_CHIN (TI04) (TO04) / SPI2_MOSI pin, the FM33FR058 chip’s PC6 / WKUP4 / SEG19 / UART5_TX / SPI2_MOSI / ATIM CH2N (TI05) (TO05) pin,the PC7 / SEG20 / UART5 RX / SPI2 MISO / ATIM CH3N (T106) (TO06) pin of the FM33FR058 chip, the PC8 / SEG21 / SPI2 SCK / SCLLA0 / (T107) (TO07) pin of the FM33FR058 chip, the PC9 / SEG22 / LED_DIG22 / SPI2_SSN / SDAA0 pin of the FM33FR058 chip, the PC10 / WKUP5 / SEG23 / LED_DIG23 / TI10 / TO10 / SMB0 ALERTB pin of the FM33FR058 chip, the PC11 / SEG24 / LED_DIG24 / ADC_IN6 / FOUT0 / MCLK2 pin of the FM33FR058 chip, the PC12 / SEG25 / LED_DIG25 / ADC_IN13 / ANATST / MCLK3 pin of the FM33FR058 chip, the PC13 / SEG26 / LED_DIG26 / ADC_IN17 / LUT0 OUT pin of the FM33FR058 chip, the PC14 / SEG27 / LED_DIG27 / ADC_IN18 / LUT1 OUT pin of the FM33FR058 chip, the PC15 / WKUP6 / SEG0 / LED_DIG28 / FOUT0 / ADC_IN0 pin of the FM33FR058 chip, the PD0 / SEG1 / LED_DIG29 / UART5 RX / ADC_IN7 pin of the FM33FR058 chip, the PD1 / SEG2 / LED_DIG30 / UART5 TX / ADC_IN1 pin of the FM33FR058 chip, the PD2 / SEG3 / LED_DIG31 / ADC_IN8 pin of the FM33FR058 chip, the PD3 / SEG32 / LED_DIG14 / ADC_IN2 pin of the FM33FR058 chip, the PD4 / SEG33 / LED_DIG15 / ADC_IN9 pin of the FM33FR058 chip,The PD13 / SEG37 / LED_DIG19 / UART2_TX / SPI1_MOSI / SMB1_ALERTB pin of the FM33FR058 chip and the PD8 / SEG38 / LED_DIG20 / SDAA1 / UART2_RX / SPI1_MISO pin of the FM33FR058 chip are connected with the display screen, the PB15 / LED_DIG3 / SPIO_MISO / SDA1 pin of the FM33FR058 chip is connected with the fourth pin of the second interface, the PD7 / WKUP1 / TS07 / ADC_IN16 pin of the FM33FR058 chip is connected with the valve control circuit, the PE9 / VREFN / TS08 / ADC_IN15 pin of the FM33FR058 chip, one end of the sixteenth capacitor and one end of the seventeenth capacitor are grounded, the PE10 / VREFP / TS09 / ADC_IN14 pin of the FM33FR058 chip, the other end of the sixteenth capacitor and the other end of the seventeenth capacitor are connected with the power supply VDD, the PA10 / TS10 / SCL1 / SPI1_SCK pin of the FM33FR058 chip, the PA11 / TS11 / SDA1 / UART5_RX / SPI1_MISO / ADC_IN5 pin of the FM33FR058 chip and the PA12 / TS12 / UART5_TX / SPI1_MOSI / ADC_IN12 pin of the FM33FR058 chip are connected with the infrared interface circuit, the PD11 / TS13 / SEG35 / LED_DIG17 / TO00 / SPI1_SSN / UART4_RX pin of the FM33FR058 chip and the PD12 / SEG36 / LED_DIG18 / TI00 / UART4_TX / MCK1 pin of the FM33FR058 chip are connected with the valve control circuit.

[0016] The beneficial effect of the further scheme is that the mechanical structure of the gas meter is simplified, and the reliability of the gas meter is improved.

[0017] Further, the cover opening detection circuit includes a first switching element, a second switching element, a sixteenth resistor, a seventeenth resistor and an eighteenth resistor,

[0018] One end of the sixteenth resistor is connected with the gas meter processor, the other end of the sixteenth resistor is connected with one end of the seventeenth resistor and one end of the eighteenth resistor respectively, the other end of the seventeenth resistor is grounded, the other end of the eighteenth resistor is connected with the first NC pin of the first switch element, the second NC pin of the first switch element and the COM pin of the second switch element respectively, the first COM pin of the first switch element, the second COM pin of the first switch element and the NC pin of the second switch element are connected with the power supply VDD.

[0019] The beneficial effect of the further scheme is that the intelligence of the gas meter is improved, the mechanical structure of the gas meter is simplified, and the reliability of the gas meter is improved.

[0020] Further, the valve control circuit comprises an L9110S / AT9110AT chip, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, an eighteenth capacitor, a nineteenth capacitor, a twentieth capacitor and a twenty-first capacitor,

[0021] The OA pin of the L9110S / AT9110AT chip is connected with one end of the eighteenth capacitor, the other end of the eighteenth capacitor is connected with one end of the nineteenth resistor, the other end of the nineteenth resistor is connected with the OB pin of the L9110S / AT9110AT chip, the first VCC pin of the L9110S / AT9110AT chip, the second VCC pin of the L9110S / AT9110AT chip, one end of the nineteenth capacitor and one end of the twentieth capacitor are connected with the power supply VCC_CAP, the other end of the nineteenth capacitor and the other end of the twentieth capacitor are grounded, the first GND pin of the L9110S / AT9110AT chip is connected with the second GND pin of the L9110S / AT9110AT chip, one end of the twentieth resistor and one end of the twenty-first resistor respectively, the other end of the twentieth resistor is grounded, the other end of the twenty-first resistor is connected with one end of the twenty-first capacitor, the other end of the twenty-first capacitor is grounded, the IA pin of the L9110S / AT9110AT chip and the IB pin of the L9110S / AT9110AT chip are connected with the gas meter processor.

[0022] The beneficial effect of the further scheme is that the control of the valve of the gas meter is realized, the intelligence of the gas meter is improved, and the mechanical structure of the gas meter is simplified.

[0023] Further, the ultrasonic gas meter further comprises an ultrasonic base watch base interface circuit,

[0024] The ultrasonic wave-based meter base interface circuit comprises a third interface, a fourth interface, a twenty-second resistor and a twenty-third resistor,

[0025] A first pin of the third interface is connected with a first pin of the fourth interface and one end of the twenty-second resistor respectively, the other end of the twenty-second resistor is connected with the gas meter processor, a second pin of the third interface is connected with a second pin of the fourth interface and one end of the twenty-third resistor respectively, the other end of the twenty-third resistor is connected with the gas meter processor, a third pin of the third interface is grounded, a fourth pin of the third interface is connected with the gas meter processor, a fifth pin of the third interface is connected with a third pin of the fourth interface, a fourth pin of the fourth interface is grounded, a sixth pin of the third interface and a seventh pin of the third interface are connected with the valve control circuit.

[0026] The beneficial effect of the above further scheme is that the intelligence of the gas meter is improved, and the mechanical structure of the gas meter is simplified.

[0027] Further, the ultrasonic wave-based gas meter further comprises a power supply circuit, the power supply circuit comprises an MD5330 chip, an MD53R33 chip, a thermistor, a diode, a twenty-fourth resistor, a twenty-second capacitor, a twenty-third capacitor, a twenty-fourth capacitor, a second electrolytic capacitor, a third electrolytic capacitor and a fourth electrolytic capacitor,

[0028] A GND pin of the MD5330 chip, one end of the twenty-second capacitor, one end of the second electrolytic capacitor, one end of the twenty-third capacitor and one end of the third electrolytic capacitor are all grounded, a VIN pin of the MD5330 chip, the other end of the twenty-second capacitor, one end of the fourth electrolytic capacitor, a VIN pin of the MD53R33 chip and a negative electrode of the diode are all connected with the power supply VCC_CAP, the other end of the fourth electrolytic capacitor is connected with the other end of the second electrolytic capacitor, a positive electrode of the diode is connected with one end of the thermistor, the other end of the thermistor is connected with the power supply VCC_Mli, an OUT pin of the MD5330 chip, the other end of the twenty-third capacitor and the other end of the third electrolytic capacitor are all connected with the power supply VDD, a GND pin of the MD53R33 chip and one end of the twenty-fourth capacitor are all grounded, the other end of the twenty-fourth capacitor and an OUT pin of the MD53R33 chip are all connected with the power supply networkVcc, an EN pin of the MD53R33 chip is connected with one end of the twenty-fourth resistor, the other end of the twenty-fourth resistor is connected with the gas meter processor.

[0029] The beneficial effect of the above further scheme is that the power supply for the gas meter is provided.

[0030] Further, the ultrasonic gas meter further comprises a power supply detection circuit, the power supply detection circuit comprising a twenty-fifth resistor, a twenty-sixth resistor, a twenty-seventh resistor, a twenty-eighth resistor, a third transistor and a fourth transistor,

[0031] One end of the twenty-fifth resistor is connected with the gas meter processor, the other end of the twenty-fifth resistor is connected with the base of the third transistor, the emitter of the third transistor is grounded, the collector of the third transistor is connected with one end of the twenty-sixth resistor, the other end of the twenty-sixth resistor is connected with the base of the fourth transistor, the emitter of the fourth transistor is connected with the power supply VCC_MLi, the collector of the fourth transistor is connected with one end of the twenty-seventh resistor, the other end of the twenty-seventh resistor is respectively connected with one end of the twenty-eighth resistor and the gas meter processor, the other end of the twenty-eighth resistor is grounded.

[0032] The beneficial effect of the above further scheme is that the voltage of the power supply is detected, and the power supply is better protected.

[0033] Further, the ultrasonic gas meter further comprises a communication circuit, the communication circuit comprising a CONN-8P interface, a twenty-ninth resistor, a thirtieth resistor, a thirty-first resistor, a thirty-second resistor, a thirty-third resistor, a thirty-fourth resistor, a thirty-fifth resistor, a thirty-sixth resistor and a fifth transistor,

[0034] The first pin of the CONN-8P interface is connected with one end of the twenty-ninth resistor, the other end of the twenty-ninth resistor is connected with the gas meter processor, the second pin of the CONN-8P interface is connected with the collector of the fifth transistor, the emitter of the fifth transistor and one end of the thirtieth resistor are grounded, the base of the fifth transistor is connected with the other end of the thirtieth resistor and one end of the thirty-first resistor respectively, the other end of the thirty-first resistor is connected with the gas meter processor, the third pin of the CONN-8P interface is connected with one end of the thirty-second resistor, the other end of the thirty-second resistor is connected with the gas meter processor, the fourth pin of the CONN-8P interface is connected with one end of the thirty-third resistor and one end of the thirty-fourth resistor respectively, the other end of the thirty-third resistor is connected with the gas meter processor, the other end of the thirty-fourth resistor and one end of the thirty-fifth resistor are connected with the power supply VDD, the other end of the thirty-fifth resistor is connected with the fifth pin of the CONN-8P interface and one end of the thirty-sixth resistor respectively, the other end of the thirty-sixth resistor is connected with the gas meter processor, the sixth pin of the CONN-8P interface is grounded, and the seventh pin of the CONN-8P interface is connected with the power supply network Vcc.

[0035] The beneficial effect of the further scheme is that the intelligence of the gas meter is improved, and the working efficiency of the gas meter is greatly improved.

[0036] Further, the ultrasonic gas meter further comprises a low-power reset detection circuit, the low-power reset detection circuit comprises an X61CN2202 chip, a thirty-seventh resistor and a twenty-fifth capacitor,

[0037] The Vout pin of the X61CN2202 chip is connected with the gas meter processor, one end of the thirty-seventh resistor and one end of the twenty-fifth capacitor respectively, the other end of the thirty-seventh resistor is connected with the power supply VDD, the other end of the twenty-fifth capacitor is grounded, the GND pin of the X61CN2202 chip is grounded, and the Vin pin of the X61CN2202 chip is connected with the power supply VDD.

[0038] The beneficial effect of the further scheme is that the reliability of the gas meter data is ensured, and the precision of the metering is improved. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 A structural block diagram of an ultrasonic gas meter is provided for the embodiments of the utility model;

[0040] Figure 2 A circuit diagram of a display screen of an ultrasonic gas meter is provided for the embodiments of the utility model;

[0041] Figure 3 The utility model provides a kind of circuit diagram of infrared interface circuit of ultrasonic gas meter for the utility model embodiment;

[0042] Figure 4 The utility model provides a kind of circuit diagram of button circuit of ultrasonic gas meter for the utility model embodiment;

[0043] Figure 5 The utility model provides a kind of circuit diagram of ultrasonic gas meter's ultrasonic flow passage control circuit for the utility model embodiment;

[0044] Figure 6 The utility model provides a kind of circuit diagram of socket of ultrasonic gas meter for the utility model embodiment;

[0045] Figure 7 The utility model provides a kind of circuit diagram of ultrasonic gas meter's ultrasonic flow passage control indicating lamp for the utility model embodiment;

[0046] Figure 8 The utility model provides a kind of circuit diagram of eSIM card seat of ultrasonic gas meter for the utility model embodiment;

[0047] Figure 9 The utility model provides a kind of circuit diagram of self-ejecting card seat of ultrasonic gas meter for the utility model embodiment;

[0048] Figure 10 The utility model provides a kind of circuit diagram of gas meter processor of ultrasonic gas meter for the utility model embodiment;

[0049] Figure 11 The utility model provides a kind of circuit diagram of uncovering detection circuit of ultrasonic gas meter for the utility model embodiment;

[0050] Figure 12 The utility model provides a kind of circuit diagram of valve control circuit of ultrasonic gas meter for the utility model embodiment;

[0051] Figure 13 The utility model provides a kind of circuit diagram of ultrasonic gas meter's ultrasonic base watch base seat interface circuit for the utility model embodiment;

[0052] Figure 14 The utility model provides a kind of circuit diagram of power supply circuit of ultrasonic gas meter for the utility model embodiment;

[0053] Figure 15 The utility model provides a kind of circuit diagram of power supply detection circuit of ultrasonic gas meter for the utility model embodiment;

[0054] Figure 16 The utility model provides a kind of circuit diagram of communication circuit of ultrasonic gas meter for the utility model embodiment;

[0055] Figure 17 A circuit diagram of a low-voltage reset detection circuit for an ultrasonic gas meter provided for an embodiment of this utility model;

[0056] Figure 18 A circuit diagram of a crystal oscillator circuit for an ultrasonic gas meter provided for an embodiment of this utility model;

[0057] Figure 19 A circuit diagram of an LED signal indicator light for an ultrasonic gas meter provided for an embodiment of this utility model;

[0058] Figure 20 A circuit diagram of the memory of an ultrasonic gas meter provided for an embodiment of this utility model;

[0059] Figure 21 A circuit diagram of a buzzer for an ultrasonic gas meter provided for an embodiment of this utility model. Detailed Implementation

[0060] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0061] like Figures 1 to 4 As shown, an ultrasonic gas meter includes an infrared interface circuit for transmitting and receiving infrared data; an ultrasonic flow channel control circuit for analyzing the gas flow direction of imported temperature and pressure data and controlling the ultrasonic flow channel transducer for transmitting and receiving ultrasonic data; an open cover detection circuit for detecting whether the gas meter casing has been illegally opened according to preset detection rules and obtaining the detection result; a gas meter processor for analyzing infrared data, detection results, and gas flow direction analysis results; a valve control circuit for controlling the opening and closing of the gas meter valve based on the data analysis results; a display screen; and a button circuit for controlling the display screen through the gas meter processor.

[0062] The gas meter processor is connected to the infrared interface circuit, the ultrasonic flow channel control circuit, the cover opening detection circuit, the valve control circuit, the display screen, and the button circuit.

[0063] Preferably, the display screen model can be YXH-53864A-5HPPR-01 / YXH-53725A-5HPPR-02.

[0064] It should be understood that the display screen is used to display gas meter information, including gas consumption, remaining amount, status code, connection code, connection channel, power information, and billing mode, and is controlled by MCU (i.e., gas meter processor).

[0065] It should be understood that, as shown in Figure 3 The infrared interface circuit includes transistor Q2, transistor Q6, transistor Q7, resistor R1, resistor R2, resistor R5, resistor R12, capacitor C5 and infrared emitting diode D2,

[0066] One end of the resistor R1 is connected with the gas meter processor, the other end of the resistor R1 is connected with the base of the transistor Q2, the emitter of the transistor Q2 is connected with the power supply VDD, the collector of the transistor Q2 is connected with one end of the resistor R5, one end of the capacitor C5, the collector of the transistor Q6 and the positive electrode of the infrared emitting diode D2 respectively, the other end of the capacitor C5 is grounded, the negative electrode of the infrared emitting diode D2 is connected with one end of the resistor R2, the other end of the resistor R2 is connected with the gas meter processor, the emitter of the transistor Q6 is connected with the base of the transistor Q7 and one end of the resistor R12 respectively, the other end of the resistor R12 and the emitter of the transistor Q7 are grounded, the collector of the transistor Q7 is connected with the gas meter processor and the other end of the resistor R5.

[0067] It should be understood that the infrared interface circuit is used for receiving and sending data through infrared (i.e. infrared data) under the control of the MCU.

[0068] Specifically, as shown in Figure 4 The key circuit includes key KEY1 and key KEY2, the 1 pin and the 4 pin of the key KEY1 are connected with the gas meter processor, the 2 pin and the 3 pin of the key KEY1 are grounded, the 1 pin and the 4 pin of the key KEY2 are connected with the gas meter processor, and the 2 pin and the 3 pin of the key KEY2 are grounded.

[0069] It should be understood that in the key circuit, the short key is used for turning the page of the information of the gas meter liquid crystal screen, and the long key is used for triggering wireless communication or infrared communication.

[0070] In the above embodiment, the gas meter processor, the infrared interface circuit, the ultrasonic flow control circuit, the cover opening detection circuit, the valve control circuit, the display screen and the key circuit are used to improve the measurement accuracy, simplify the mechanical structure of the gas meter, and improve the reliability of the gas meter.

[0071] Optionally, as an embodiment of the utility model, as shown in Figures 5 to 9 The ultrasonic flow control circuit includes an ultrasonic processor, a socket, an ultrasonic flow control indicator lamp and a card seat,

[0072] The ultrasonic processor is connected with the gas meter processor through the socket, and the ultrasonic processor is connected with the ultrasonic flow control indicator lamp and the card seat respectively,

[0073] The ultrasonic wave processor comprises an L660XL chip U1A, an IPEX antenna seat ANT, a first resistor R4, a second resistor R5, a third resistor R6, a fourth resistor R10, a fifth resistor R11, a sixth resistor R12, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R17, a first transistor Q2, a second transistor Q1, a first electrolytic capacitor CE1, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C10, a seventh capacitor C17, an eighth capacitor C18, a ninth capacitor C6, a tenth capacitor C7, an eleventh capacitor C8, a twelfth capacitor C9, a first ESD protection diode D1ESD1, a second ESD protection diode D1ESD2, a third ESD protection diode D1ESD3, a fourth ESD protection diode D1ESD4, and a fifth ESD protection diode D1ESD,

[0074] The first GND pin of the L660XL chip U1A is grounded, the USIM GND pin of the L660XL chip U1A is connected with the card seat, the USIM DATA pin of the L660XL chip U1A is connected with one end of the first resistor R4, the other end of the first resistor R4 is connected with one end of the first ESD protection diode D1ESD1, one end of the first capacitor C1 and the card seat respectively, the USIM_RST pin of the L660XL chip U1A is connected with one end of the second resistor R5, the other end of the second resistor R5 is connected with one end of the second ESD protection diode D1ESD2, one end of the second capacitor C2 and the card seat respectively, the USIM_CLK pin of the L660XL chip U1A is connected with one end of the third resistor R6, the other end of the third resistor R6 is connected with one end of the third ESD protection diode D1ESD3, one end of the third capacitor C3 and the card seat respectively, the USIM_VDD pin of the L660XL chip U1A is connected with one end of the fourth ESD protection diode D1ESD4, one end of the fourth capacitor C4, one end of the fifth capacitor C5 and the card seat respectively, the other end of the first ESD protection diode D1ESD1, the other end of the first capacitor C1, the other end of the second ESD protection diode D1ESD2, the other end of the second capacitor C2, the other end of the third ESD protection diode D1ESD3, the other end of the third capacitor C3, the other end of the fourth ESD protection diode D1ESD4, the other end of the fourth capacitor C4 and the other end of the fifth capacitor C5 are grounded, the RESET pin of the L660XL chip U1A is connected with the socket, the NET_STATE pin of the L660XL chip U1A is connected with the ultrasonic flow channel control indicator lamp, the UART_RXD pin of the L660XL chip U1A is connected with one end of the fourth resistor R10 and the collector of the first transistor Q2 respectively, the other end of the fourth resistor R10 and one end of the fifth resistor R11 are connected with the power supply VDD-1.8, the other end of the fifth resistor R11 is connected with the base of the first transistor Q2, the emitter of the first transistor Q2 is connected with one end of the sixth resistor R12 and the socket respectively, the other end of the sixth resistor R12 is connected with the power supply L660_VCC, the UART_TXD pin of the L660XL chip U1A is connected with one end of the seventh resistor R7 and the emitter of the second transistor Q1 respectively, the other end of the seventh resistor R7 is connected with one end of the eighth resistor R8 and the base of the second transistor Q1 respectively, the other end of the eighth resistor R8 is connected with the power supply VDD-1.8 connection, the collector of the second transistor Q1 is connected with one end of the ninth resistor R9 and the socket respectively, the other end of the ninth resistor R9 is connected with the power supply L660_VCC, the WAKEUP_IN pin of the L660XL chip U1A is connected with the socket, the VDD_EXT pin of the L660XL chip U1A is connected with one end of the sixth capacitor C10, the other end of the sixth capacitor C10 is grounded, the second GND pin of the L660XL chip U1A and the third GND pin of the L660XL chip U1A are both grounded, the ANT_RF pin of the L660XL chip U1A is connected with one end of the tenth resistor R17 and one end of the seventh capacitor C17 respectively, the other end of the seventh capacitor C17 is grounded, the other end of the tenth resistor R17 is connected with one end of the eighth capacitor C18, one end of the fifth ESD protection diode D1ESD and one end of the IPEX antenna socket ANT respectively, the other end of the eighth capacitor C18 is grounded, the other end of the fifth ESD protection diode D1ESD is grounded, the other end of the IPEX antenna socket ANT is grounded, the fourth GND pin of the L660XL chip U1A and the fifth GND pin of the L660XL chip U1A are both grounded, the DBG_RXD pin of the L660XL chip U1A and the DBG_TXD pin of the L660XL chip U1A are both connected with the socket, the sixth GND pin of the L660XL chip U1A and the seventh GND pin of the L660XL chip U1A are both grounded, the first VBAT pin of the L660XL chip U1A and the second VBAT pin of the L660XL chip U1A are both connected with the power supply L660_VCC, one end of the first electrolytic capacitor CE1, one end of the ninth capacitor C6, one end of the tenth capacitor C7, one end of the eleventh capacitor C8 and one end of the twelfth capacitor C9 are all connected with the power supply L660_VCC, the other end of the first electrolytic capacitor CE1, the other end of the ninth capacitor C6, the other end of the tenth capacitor C7, the other end of the eleventh capacitor C8 and the other end of the twelfth capacitor C9 are all grounded.

[0075] Specifically, the ultrasonic flow channel control circuit is used for controlling the ultrasonic flow channel transducer to send and receive ultrasonic waves, collecting temperature and pressure, calculating the flow speed of the gas in real time, judging whether the meter is filled with air or gas (to achieve the purpose of meter disassembly detection), judging whether there is water in the meter, and judging the flow direction of the gas (to achieve the purpose of reverse installation detection).

[0076] It should be understood that, as Figure 6As shown in the figure, the socket comprises an interface J6 and an interface P6, a pin 1 of the interface J6 is grounded, and a pin 2 and a pin 3 of the interface J6 are connected with the ultrasonic processor respectively.

[0077] Specifically, as shown in the figure, Figure 7 the ultrasonic flow channel control indicator light comprises a resistor R3, a resistor R1, a resistor R2, a transistor Q3 and an infrared emitting diode LED1,

[0078] One end of the resistor R3 is connected with the ultrasonic processor, the other end of the resistor R3 is connected with the base of the transistor Q3 and one end of the resistor R2 respectively, the other end of the resistor R2 and the emitter of the transistor Q3 are grounded, the collector of the transistor Q3 is connected with one end of the resistor R1, the other end of the resistor R1 is connected with the negative electrode of the infrared emitting diode LED1, and the positive electrode of the infrared emitting diode LED1 is connected with the power supply L660_VCC.

[0079] As shown in the figure, Figure 8 the socket can be an eSIM socket, the eSIM socket comprises an eSIM module SIM1, a capacitor C11 and a resistor R13, a VSS pin of the eSIM module SIM1 is connected with a PAD pin of the eSIM module SIM1, one end of the capacitor C11 and the ultrasonic processor respectively, the other end of the capacitor C11 is connected with the ultrasonic processor and a VDD pin of the eSIM module SIM1 respectively, an I / O pin of the eSIM module SIM1 is connected with the ultrasonic processor and one end of the resistor R13 respectively, and the other end of the resistor R13 is connected with the ultrasonic processor.

[0080] Specifically, as shown in the figure, Figure 9 the socket can also be a self-ejecting socket, the self-ejecting socket comprises a SIM-6PIN interface SIM2, a VCC interface of the SIM-6PIN interface SIM2, a GND interface of the SIM-6PIN interface SIM2, a RST interface of the SIM-6PIN interface SIM2, a RST interface of the SIM-6PIN interface SIM2, a CLK interface of the SIM-6PIN interface SIM2 and an I / O interface of the SIM-6PIN interface SIM2 are connected with the ultrasonic processor.

[0081] In the above embodiment, the measurement accuracy is improved, the mechanical structure of the gas meter is simplified, and the reliability of the gas meter is improved.

[0082] Optionally, as an embodiment of the utility model, Figure 10As shown, the gas meter processor includes an FM33FR058 chip U4, an eleventh resistor R15, a twelfth resistor R14, a thirteenth resistor R16, a fourteenth resistor R37, a fifteenth resistor R38, a thirteenth capacitor C7, a fourteenth capacitor C8, a fifteenth capacitor C9, a sixteenth capacitor C12, a seventeenth capacitor C13, a first interface P1, and a second interface J1,

[0083] The PA1 / TO04 / TI04 / COMP2_INN / LUT2_OUT pin of the FM33FR058 chip U4 is connected with the key circuit, the PA3 / SWCLK / UART3_RX pin of the FM33FR058 chip U4 is connected with the first pin of the first interface P1 and one end of the eleventh resistor R15 respectively, the PA4 / SWIO / UART3_TX pin of the FM33FR058 chip U4 is connected with the second pin of the first interface P1 and one end of the twelfth resistor R14 respectively, the third pin of the first interface P1, the other end of the eleventh resistor R15 and the other end of the twelfth resistor R14 are all connected with the power supply VDD, the fourth pin of the first interface P1 is grounded, the PA7 / SEG39 / LED_DIG21 / FOUT1 pin of the FM33FR058 chip U4 is connected with the key circuit, the PA9 / XTHFO pin of the FM33FR058 chip U4 is connected with the cover detection circuit, the REGC pin of the FM33FR058 chip U4 is connected with one end of the thirteenth resistor R16, the other end of the thirteenth resistor R16 is connected with one end of the thirteenth capacitor C7, the VSS pin of the FM33FR058 chip U4, the VSSA pin of the FM33FR058 chip U4, the other end of the thirteenth capacitor C7, one end of the fourteenth capacitor C8 and one end of the fifteenth capacitor C9 are all grounded, the VDDA pin of the FM33FR058 chip U4, the VDD pin of the FM33FR058 chip U4, the other end of the fourteenth capacitor C8 and the other end of the fifteenth capacitor C9 are all connected with the power supply VDD, the PB0 / UART3_RX / SCLA0 pin of the FM33FR058 chip U4 is connected with the first pin of the second interface J1 and one end of the fourteenth resistor R37 respectively, the PB1 / UART3_TX / SDAA0 pin of the FM33FR058 chip U4 is connected with the second pin of the second interface J1 and one end of the fifteenth resistor R38 respectively, the other end of the fourteenth resistor R37 and the other end of the fifteenth resistor R38 are all connected with the power supply VDD, the third pin of the second interface J1 is grounded, the PB2 / WKUP2 / SEG40 / UART4_RX / SCLA1 pin of the FM33FR058 chip U4, the PB3 / SEG41 / UART4_TX / SDAA1 pin of the FM33FR058 chip U4, the PB6 / COM0 / LED_SEG0 / TI11 / TO11 pin of the FM33FR058 chip U4, the PB7 / COM1 / LED_SEG1 / TI02 / TO02 pin of the FM33FR058 chip U4,the PB8 / COM2 / LED_SEG2 / TI13 / TO13 pin of the FM33FR058 chip U4, the PB9 / COM3 / LED_SEG3 / UART0_TX pin of the FM33FR058 chip U4, the PB10 / COM4 / SEG28 / LED_SEG4 / UART0_RX pin of the FM33FR058 chip U4, the PB11 / COM5 / SEG29 / LED_SEG5 / TI12 / TO12 / SMB0_ALERTB pin of the FM33FR058 chip U4, the PE0 / SEG4 / TS00 / LED_DIG4 / SPI0_SCK / SCL1 pin of the FM33FR058 chip U4, the PE1 / SEG5 / TS01 / LED_DIG5 / SPI0_SSN / TI06 / TO06 pin of the FM33FR058 chip U4, the PE2 / SEG6 / TS02 / LED_DIG6 / SPI3_SSN / TI05 / TO05 pin of the FM33FR058 chip U4, the PE3 / SEG7 / TS03 / LED_DIG7 / SCL2 / SPI3_SCK / LPT16_CH1 pin of the FM33FR058 chip U4, the PE4 / SEG8 / LED_DIG8 / TS04 / SDA2 / SPI3_MISO / LPT16_CH2 pin of the FM33FR058 chip U4, the PE5 / SEG9 / LED_DIG9 / SPI3_MOSI pin of the FM33FR058 chip U4, the PE6 / SEG10 / LED_DIG10 / SPI2_MOSI pin of the FM33FR058 chip U4, the PE7 / SEG11 / LED_DIG11 / SPI2_MOSI pin of the FM33FR058 chip U4, the PE8 / SEG12 / LED_DIG12 / SCL3 / SPI2_SCK / COMP1_OUT pin of the FM33FR058 chip U4, the PC0 / SEG13 / LED_DIG13 / SPI3_SCK / COMP2_OUT pin of the FM33FR058 chip U4, the PC3 / SEG16 / TS05 / ATIM_CH3 (TI02) (TO02) / SPI2_SCK / SCL0 pin of the FM33FR058 chip U4, the PC4 / SEG17 / TS06 / UART2_RX / ATIM_CH4 (TI03) (TO03) / SPI2_MISO / SDA0 pin of the FM33FR058 chip U4, the PC5 / SEG18 / UART2_TX / ATIM_CHIN (TI04) (TO04) / SPI2_MOSI pin of the FM33FR058 chip U4,the PC6 / WKUP4 / SEG19 / UART5_TX / SPI2_MOSI / ATIM CH2N (T105) (TO05) pin of the FM33FR058 chip U4, the PC7 / SEG20 / UART5_RX / SPI2_MISO / ATIM_CH3N (T106) (TO06) pin of the FM33FR058 chip U4, the PC8 / SEG21 / SPI2_SCK / SCLLA0 / (T107) (TO07) pin of the FM33FR058 chip U4, the PC9 / SEG22 / LED_DIG22 / SPI2_SSN / SDAA0 pin of the FM33FR058 chip U4, the PC10 / WKUP5 / SEG23 / LED_DIG23 / TI10 / TO10 / SMB0_ALERTB pin of the FM33FR058 chip U4, the PC11 / SEG24 / LED_DIG24 / ADC_IN6 / FOUT0 / MCLK2 pin of the FM33FR058 chip U4, the PC12 / SEG25 / LED_DIG25 / ADC_IN13 / ANATST / MCLK3 pin of the FM33FR058 chip U4, the PC13 / SEG26 / LED_DIG26 / ADC_IN17 / LUT0_OUT pin of the FM33FR058 chip U4, the PC14 / SEG27 / LED_DIG27 / ADC_IN18 / LUT1_OUT pin of the FM33FR058 chip U4, the PC15 / WKUP6 / SEG0 / LED_DIG28 / FOUT0 / ADC_IN0 pin of the FM33FR058 chip U4, the PD0 / SEG1 / LED_DIG29 / UART5_RX / ADC_IN7 pin of the FM33FR058 chip U4, the PD1 / SEG2 / LED_DIG30 / UART5_TX / ADC_IN1 pin of the FM33FR058 chip U4, the PD2 / SEG3 / LED_DIG31 / ADC_IN8 pin of the FM33FR058 chip U4, the PD3 / SEG32 / LED_DIG14 / ADC_IN2 pin of the FM33FR058 chip U4, the PD4 / SEG33 / LED_DIG15 / ADC_IN9 pin of the FM33FR058 chip U4,The PD13 / SEG37 / LED_DIG19 / UART2_TX / SPI1_MOSI / SMB1_ALERTB pin of the FM33FR058 chip U4 and the PD8 / SEG38 / LED_DIG20 / SDAA1 / UART2_RX / SPI1_MISO pin of the FM33FR058 chip U4 are connected with the display screen, the PB15 / LED_DIG3 / SPIO_MISO / SDA1 pin of the FM33FR058 chip U4 is connected with the fourth pin of the second interface J1, the PD7 / WKUP1 / TS07 / ADC_IN16 pin of the FM33FR058 chip U4 is connected with the valve control circuit, the PE9 / VREFN / TS08 / ADC_IN15 pin of the FM33FR058 chip U4, one end of the sixteenth capacitor C12 and one end of the seventeenth capacitor C13 are grounded, the PE10 / VREFP / TS09 / ADC_IN14 pin of the FM33FR058 chip U4, the other end of the sixteenth capacitor C12 and the other end of the seventeenth capacitor C13 are connected with the power supply VDD, the PA10 / TS10 / SCL1 / SPI1_SCK pin of the FM33FR058 chip U4, the PA11 / TS11 / SDA1 / UART5_RX / SPI1_MISO / ADC_IN5 pin of the FM33FR058 chip U4 and the PA12 / TS12 / UART5_TX / SPI1_MOSI / ADC_IN12 pin of the FM33FR058 chip U4 are connected with the infrared interface circuit, the PD11 / TS13 / SEG35 / LED_DIG17 / TO00 / SPI1_SSN / UART4_RX pin of the FM33FR058 chip U4 and the PD12 / SEG36 / LED_DIG18 / TI00 / UART4_TX / MCK1 pin of the FM33FR058 chip U4 are connected with the valve control circuit.

[0084] It should be understood that the 1 pin in the first interface P1 is a reserved pin, which is prepared for future update.

[0085] It should be understood that the MCU (i.e. the gas meter processor) is responsible for processing and controlling the data returned by each functional circuit.

[0086] In the above embodiment, the mechanical structure of the gas meter is simplified, and the reliability of the gas meter is improved.

[0087] Optionally, as an embodiment of the present application, Figure 11As shown in the figure, the cover opening detection circuit comprises a first switch element BTN1, a second switch element BTN2, a sixteenth resistor R34, a seventeenth resistor R36 and an eighteenth resistor R33,

[0088] One end of the sixteenth resistor R34 is connected with the gas meter processor, the other end of the sixteenth resistor R34 is connected with one end of the seventeenth resistor R36 and one end of the eighteenth resistor R33 respectively, the other end of the seventeenth resistor R36 is grounded, the other end of the eighteenth resistor R33 is connected with the first NC pin of the first switch element BTN1, the second NC pin of the first switch element BTN1 and the COM pin of the second switch element BTN2 respectively, the first COM pin of the first switch element BTN1, the second COM pin of the first switch element BTN1 and the NC pin of the second switch element BTN2 are connected with the power supply VDD.

[0089] It should be understood that the cover opening detection circuit is used for detecting whether the gas meter shell is opened illegally through the press switch, data is transmitted to the MCU (i.e. the gas meter processor), the MCU (i.e. the gas meter processor) immediately closes the valve and reports.

[0090] In the above embodiment, the intelligence of the gas meter is improved, the mechanical structure of the gas meter is simplified, and the reliability of the gas meter is improved.

[0091] Optionally, as an embodiment of the utility model, Figure 12 As shown in the figure, the valve control circuit comprises an L9110S / AT9110AT chip U5, a nineteenth resistor R17, a twentieth resistor R19, a twenty-first resistor R18, an eighteenth capacitor C14, a nineteenth capacitor C10, a twentieth capacitor C11 and a twenty-first capacitor C15,

[0092] The OA pin of the L9110S / AT9110AT chip U5 is connected with one end of the eighteenth capacitor C14, the other end of the eighteenth capacitor C14 is connected with one end of the nineteenth resistor R17, the other end of the nineteenth resistor R17 is connected with the OB pin of the L9110S / AT9110AT chip U5, the first VCC pin of the L9110S / AT9110AT chip U5, the second VCC pin of the L9110S / AT9110AT chip U5, one end of the nineteenth capacitor C10 and one end of the twentieth capacitor C11 are all connected with the power supply VCC_CAP, the other end of the nineteenth capacitor C10 and the other end of the twentieth capacitor C11 are all grounded, the first GND pin of the L9110S / AT9110AT chip U5 is connected with the second GND pin of the L9110S / AT9110AT chip U5, one end of the twentieth resistor R19 and one end of the twenty-first resistor R18 respectively, the other end of the twentieth resistor R19 is grounded, the other end of the twenty-first resistor R18 is connected with one end of the twenty-first capacitor C15, the other end of the twenty-first capacitor C15 is grounded, the IA pin of the L9110S / AT9110AT chip U5 and the IB pin of the L9110S / AT9110AT chip U5 are all connected with the gas meter processor.

[0093] It should be understood that the valve control circuit controls the gas meter valve according to the data transmitted by the MCU (i.e. the processor).

[0094] In the above embodiment, the control of the gas meter valve is realized, the intelligence of the gas meter is improved, and the mechanical structure of the gas meter is simplified.

[0095] Optionally, as an embodiment of the utility model, Figure 13 As shown in the figure, the ultrasonic gas meter further comprises an ultrasonic base watch base interface circuit,

[0096] The ultrasonic base watch base interface circuit comprises a third interface P2, a fourth interface J5, a twenty-second resistor R29 and a twenty-third resistor R28,

[0097] The first pin of the third interface P2 is connected with the first pin of the fourth interface J5 and one end of the twenty-second resistor R29 respectively, the other end of the twenty-second resistor R29 is connected with the gas meter processor, the second pin of the third interface P2 is connected with the second pin of the fourth interface J5 and one end of the twenty-third resistor R28 respectively, the other end of the twenty-third resistor R28 is connected with the gas meter processor, the third pin of the third interface P2 is grounded, the fourth pin of the third interface P2 is connected with the gas meter processor, the fifth pin of the third interface P2 is connected with the third pin of the fourth interface J5, the fourth pin of the fourth interface J5 is grounded, the sixth pin of the third interface P2 and the seventh pin of the third interface P2 are connected with the valve control circuit.

[0098] In the above embodiment, the intelligence of the gas meter is improved, and the mechanical structure of the gas meter is simplified.

[0099] Optionally, as an embodiment of the utility model, Figure 14 As shown in the figure, the ultrasonic gas meter further comprises a power supply circuit, the power supply circuit comprises an MD5330 chip U1, an MD53R33 chip U3, a thermistor F1, a diode D1, a twenty-fourth resistor R11, a twenty-second capacitor C1, a twenty-third capacitor C2, a twenty-fourth capacitor C6, a second electrolytic capacitor CS2, a third electrolytic capacitor C3 and a fourth electrolytic capacitor CS1,

[0100] The GND pin of the MD5330 chip U1, one end of the 22nd capacitor C1, one end of the 2nd electrolytic capacitor CS2, one end of the 23rd capacitor C2, and one end of the 3rd electrolytic capacitor C3 are all grounded. The VIN pin of the MD5330 chip U1, the other end of the 22nd capacitor C1, one end of the 4th electrolytic capacitor CS1, the VIN pin of the MD53R33 chip U3, and the cathode of the diode D1 are all connected to the power supply VCC_CAP. The other end of the 4th electrolytic capacitor CS1 is connected to the other end of the 2nd electrolytic capacitor CS2. The anode of the diode D1 is connected to one end of the thermistor F1. The other end of the thermistor F1 is connected to the power supply VCC_Mli. The OUT pin of the MD5330 chip U1, the other end of the 23rd capacitor C2, and the other end of the 3rd electrolytic capacitor C3 are all connected to the power supply VDD. The GND pin of the MD53R33 chip U3 and one end of the 24th capacitor C6 are grounded. The other end of the 24th capacitor C6 and the OUT pin of the MD53R33 chip U3 are all connected to the power supply networkVcc. The EN pin of the MD53R33 chip U3 is connected to one end of the 24th resistor R11. The other end of the 24th resistor R11 is connected to the gas meter processor.

[0101] It should be understood that the power supply circuit is used to ensure a stable power supply for the entire module.

[0102] In the above embodiment, electricity is provided to the gas meter.

[0103] Optionally, as one embodiment of this utility model, such as Figure 15 As shown, the ultrasonic gas meter also includes a power detection circuit, which includes a 25th resistor R9, a 26th resistor R6, a 27th resistor R8, a 28th resistor R13, a third transistor Q4, and a fourth transistor Q1.

[0104] One end of the 25th resistor R9 is connected to the gas meter processor, and the other end of the 25th resistor R9 is connected to the base of the third transistor Q4. The emitter of the third transistor Q4 is grounded, and the collector of the third transistor Q4 is connected to one end of the 26th resistor R6. The other end of the 26th resistor R6 is connected to the base of the fourth transistor Q1. The emitter of the fourth transistor Q1 is connected to the power supply VCC_MLi. The collector of the fourth transistor Q1 is connected to one end of the 27th resistor R8. The other end of the 27th resistor R8 is connected to one end of the 28th resistor R13 and the gas meter processor, respectively. The other end of the 28th resistor R13 is grounded.

[0105] It should be understood that the power detection circuit is used for detecting the voltage of the main power supply, and the data is transmitted to the MCU (i.e. the gas meter processor), and the MCU (i.e. the gas meter processor) displays the corresponding voltage level to the display screen and closes the valve and reports when the power level is low.

[0106] In the above embodiment, the voltage of the power supply is detected, and the power supply is better protected.

[0107] Optionally, as an embodiment of the utility model, Figure 16 As shown in the figure, the ultrasonic gas meter further comprises a communication circuit, the communication circuit comprises a CONN-8P interface P4, a twenty-ninth resistor R20, a thirtieth resistor R26, a thirty-first resistor R25, a thirty-second resistor R23, a thirty-third resistor R31, a thirty-fourth resistor R24, a thirty-fifth resistor R22, a thirty-sixth resistor R30 and a fifth transistor Q8,

[0108] The first pin of the CONN-8P interface P4 is connected with one end of the twenty-ninth resistor R20, the other end of the twenty-ninth resistor R20 is connected with the gas meter processor, the second pin of the CONN-8P interface P4 is connected with the collector of the fifth transistor Q8, the emitter of the fifth transistor Q8 and one end of the thirtieth resistor R26 are grounded, the base of the fifth transistor Q8 is connected with the other end of the thirtieth resistor R26 and one end of the thirty-first resistor R25 respectively, the other end of the thirty-first resistor R25 is connected with the gas meter processor, the third pin of the CONN-8P interface P4 is connected with one end of the thirty-second resistor R23, the other end of the thirty-second resistor R23 is connected with the gas meter processor, the fourth pin of the CONN-8P interface P4 is connected with one end of the thirty-third resistor R31 and one end of the thirty-fourth resistor R24 respectively, the other end of the thirty-third resistor R31 is connected with the gas meter processor, the other end of the thirty-fourth resistor R24 and one end of the thirty-fifth resistor R22 are connected with the power supply VDD respectively, the other end of the thirty-fifth resistor R22 is connected with the fifth pin of the CONN-8P interface P4 and one end of the thirty-sixth resistor R30 respectively, the other end of the thirty-sixth resistor R30 is connected with the gas meter processor, the sixth pin of the CONN-8P interface P4 is grounded, and the seventh pin of the CONN-8P interface P4 is connected with the power supply network Vcc.

[0109] It should be understood that the communication circuit is used for sending and receiving instruction data through a wireless network and is controlled by the MCU (i.e. the gas meter processor).

[0110] In the above embodiment, the intelligence of the gas meter is improved, and the working efficiency of the gas meter is greatly improved.

[0111] Optionally, as an embodiment of the utility model, as shown in Figure 17 The ultrasonic gas meter further includes a low-power reset detection circuit, the low-power reset detection circuit includes an X61CN2202 chip U7, a thirty-seventh resistor R32, and a twenty-fifth capacitor C21,

[0112] A Vout pin of the X61CN2202 chip U7 is connected with the gas meter processor, one end of the thirty-seventh resistor R32, and one end of the twenty-fifth capacitor C21 respectively, the other end of the thirty-seventh resistor R32 is connected with a power supply VDD, the other end of the twenty-fifth capacitor C21 is grounded, a GND pin of the X61CN2202 chip U7 is grounded, and a Vin pin of the X61CN2202 chip U7 is connected with the power supply VDD.

[0113] It should be understood that the low-power reset detection circuit is used for detecting low voltage of the MCU (i.e. the gas meter processor), and the controller does not run to ensure data reliability, and the MCU (i.e. the gas meter processor) is reset when the voltage rises, and the controller starts to work.

[0114] In the above embodiment, the reliability of the gas meter data is ensured, and the precision of the metering is improved.

[0115] Optionally, as an embodiment of the utility model, as shown in Figure 18 The ultrasonic gas meter further includes a crystal oscillator circuit, the crystal oscillator circuit includes a CY32768 chip X1, an inductor L1, an inductor L2, a capacitor C19, and a capacitor C22,

[0116] A pin 1 of the CY32768 chip X1 is connected with one end of the capacitor C19 and one end of the inductor L1 respectively, the other end of the inductor L1 is connected with the gas meter processor, the other end of the capacitor C19 and one end of the capacitor C22 are grounded, the other end of the capacitor C22 is connected with a pin 2 of the CY32768 chip X1 and one end of the inductor L2 respectively, and the other end of the inductor L2 is connected with the gas meter processor.

[0117] It should be understood that the crystal oscillator circuit is used for providing an accurate clock for the MCU (i.e. the gas meter processor).

[0118] Optionally, as an embodiment of the utility model, as shown in Figure 19 The ultrasonic gas meter further includes an LED signal prompt lamp, the LED signal prompt lamp includes a resistor R7, a resistor R27, a resistor R10, a resistor R21, a transistor Q5, and an infrared emitting diode LED1,

[0119] One end of the resistance R10 is connected with the ultrasonic meter base interface circuit, the other end of the resistance R10 is connected with one end of the resistance R21 and the base of the transistor Q5 respectively, the emitter of the transistor Q5 and the other end of the resistance R21 are grounded, the collector of the transistor Q5 is connected with one end of the resistance R7 and one end of the resistance R27 respectively, the other end of the resistance R7 is connected with the negative electrode of the infrared emitting diode LED1, the positive electrode of the infrared emitting diode LED1 is connected with the power supply VCC_CAP, the other end of the resistance R27 is connected with the gas meter processor.

[0120] It should be understood that the LED signal prompt lamp is used for outputting a meter checking pulse.

[0121] Optionally, as an embodiment of the utility model, as shown in the figure, Figure 20 It further includes a memory, the memory includes a BY25D40AS chip U2, a transistor Q3, a resistance R3, a resistance R4 and a capacitor C4,

[0122] The / CS pin of the BY25D40AS chip U2, the SO pin of the BY25D40AS chip U2, the SCLK pin of the BY25D40AS chip U2 and the SI pin of the BY25D40AS chip U2 are connected with the gas meter processor, the / WP pin of the BY25D40AS chip U2 is connected with one end of the resistance R4, the other end of the resistance R4 is connected with the HOLD pin of the BY25D40AS chip U2, the VCC pin of the BY25D40AS chip U2, one end of the capacitor C4 and the collector of the transistor Q3 respectively, the other end of the capacitor C4 is grounded, the emitter of the transistor Q3 is connected with the power supply VDD, the base of the transistor Q3 is connected with one end of the resistance R3, the other end of the resistance R3 is connected with the gas meter processor.

[0123] It should be understood that the memory accesses data according to the instruction of the MCU (i.e. the gas meter processor). The maximum connectable memory chip is 1Mbit.

[0124] Optionally, as an embodiment of the utility model, as shown in the figure, Figure 21 It further includes a buzzer output circuit, the buzzer output circuit includes a buzzer BUZZ1, a resistance R35 and a transistor Q9,

[0125] One end of the resistance R35 is connected with the gas meter processor, the other end of the resistance R35 is connected with the base of the transistor Q9, the emitter of the transistor Q9 is grounded, the collector of the transistor Q9 is connected with one end of the buzzer BUZZ1, the other end of the buzzer BUZZ1 is connected with the power supply VCC_CAP.

[0126] It should be understood that the buzzer output circuit feeds back the operation and instruction execution of the key circuit.

[0127] Optionally, as an embodiment of the utility model, in the utility model, MCU is responsible for processing data returned by each functional circuit and controlling it, and other functional circuits are described as follows:

[0128] Power supply circuit: ensure stable power supply for the whole module;

[0129] Power detection circuit: detect the voltage of the main power supply, transmit data to MCU, and MCU displays the corresponding voltage level to the display screen, and closes the valve and reports when the power level is low;

[0130] Communication module circuit: send and receive instruction data through wireless network, controlled by MCU;

[0131] Display screen: display gas meter information, including gas consumption, remaining amount, state code, connection code, connection channel, power information and billing mode, controlled by MCU;

[0132] Infrared interface circuit: transmit and receive data through infrared, controlled by MCU;

[0133] Valve control circuit: control the gas meter valve according to the data transmitted by MCU;

[0134] Ultrasonic flow control circuit: responsible for sending and receiving ultrasonic waves by ultrasonic flow transducer, collecting temperature and pressure, calculating the flow speed of the gas in real time, judging whether the meter contains air or gas (to achieve the purpose of meter detection), judging whether there is water in the meter, and judging the flow direction of the gas (to achieve the purpose of reverse installation detection);

[0135] MCU low voltage reset circuit: when detecting low voltage of MCU, the controller does not run to ensure data reliability, and when the voltage rises, MCU is reset, and the controller starts to work;

[0136] Key circuit: short key turns the page of the gas meter LCD screen information, and long key triggers wireless communication or infrared communication;

[0137] Buzzer output circuit: feedback for key operation and instruction execution;

[0138] Cover detection circuit: detect whether the gas meter shell is opened illegally by pressing switch, and transmit data to MCU, and MCU closes the valve immediately and reports;

[0139] Memory circuit: access data according to MCU instruction. Maximum 1Mbit memory chip can be connected;

[0140] LED prompt light circuit: used for outputting meter pulse;

[0141] Crystal oscillator circuit: for providing accurate clock to MCU.

[0142] Optionally, as an embodiment of the utility model, the utility model mainly features high accuracy, no mechanical structure of the skin film type gas meter and high reliability.

[0143] The use method of the utility model is that infrared data is received and sent through the infrared interface circuit, temperature data and pressure data are analyzed in the direction of gas flow through the ultrasonic flow channel control circuit, the ultrasonic flow channel transducer is controlled to send and receive ultrasonic data, whether the gas meter shell is illegally opened is detected according to the cover opening detection circuit and the preset detection rule, the detection result is obtained after detection, the infrared data, the detection result and the analysis result of the direction of gas flow are analyzed through the gas meter processor, the gas meter valve is controlled to open and close according to the valve control circuit and the result after data analysis, and the display screen is controlled through the gas meter processor.

[0144] The utility model has the advantages of improving the measurement accuracy, simplifying the mechanical structure of the gas meter, and improving the reliability of the gas meter.

[0145] The above only is the preferred embodiment of the utility model, and does not use to limit the utility model, and any modification, equivalent replacement, improvement etc. that is made in the spirit and principle of the utility model should be contained in the protection scope of the utility model.

Claims

1. An ultrasonic gas meter, characterized in that, The system includes an infrared interface circuit for transmitting and receiving infrared data; an ultrasonic flow channel control circuit for analyzing the gas flow direction of imported temperature and pressure data and controlling the ultrasonic transducer for transmitting and receiving ultrasonic data; a cover-opening detection circuit for detecting whether the gas meter casing has been illegally opened according to preset detection rules and obtaining the detection result; a gas meter processor for analyzing infrared data, detection results, and gas flow direction analysis results; a valve control circuit for controlling the opening and closing of the gas meter valve based on the data analysis results; a display screen; and a button circuit for controlling the display screen through the gas meter processor. The gas meter processor is connected to the infrared interface circuit, the ultrasonic flow channel control circuit, the cover opening detection circuit, the valve control circuit, the display screen, and the button circuit.

2. An ultrasonic gas meter according to claim 1, characterized in that, The ultrasonic flow channel control circuit includes an ultrasonic processor, a socket, an ultrasonic flow channel control indicator light, and a card slot. The ultrasonic processor is connected to the gas meter processor via the socket, and is also connected to the ultrasonic flow channel control indicator light and the card slot. The ultrasonic processor includes an L660XL chip, an IPEX antenna mount, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a first transistor, a second transistor, a first electrolytic capacitor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, a first ESD protection diode, a second ESD protection diode, a third ESD protection diode, a fourth ESD protection diode, and a fifth ESD protection diode. The first GND pin of the L660XL chip is grounded. The USIM_GND pin of the L660XL chip is connected to the card slot. The USIM_DATA pin of the L660XL chip is connected to one end of the first resistor. The other end of the first resistor is connected to one end of the first ESD protection diode, one end of the first capacitor, and the card slot. The USIM_RST pin of the L660XL chip is connected to one end of the second resistor. The other end of the second resistor is connected to one end of the second ESD protection diode, one end of the second capacitor, and the card slot. The USIM_CLK pin of the L660XL chip is connected to one end of the third resistor. The other end of the third resistor is connected to one end of the third ESD protection diode, one end of the third capacitor, and the card slot. The USIM_VDD pin of the L660XL chip is connected to one end of the fourth ESD protection diode, one end of the fourth capacitor, one end of the fifth capacitor, and the card slot. The other ends of the first ESD protection diode, the first capacitor, the second ESD protection diode, and the second... The other ends of the capacitor, the third ESD protection diode, the third capacitor, the fourth ESD protection diode, the fourth capacitor, and the fifth capacitor are all grounded. The RESET pin of the L660XL chip is connected to the socket. The NET_STATE pin of the L660XL chip is connected to the ultrasonic flow channel control indicator. The UART_RXD pin of the L660XL chip is connected to one end of the fourth resistor and the collector of the first transistor. The other ends of the fourth resistor and the fifth resistor are both connected to the power supply VDD-1.

8. The other end of the fifth resistor is connected to the base of the first transistor. The emitter of the first transistor is connected to one end of the sixth resistor and the socket. The other end of the sixth resistor is connected to the power supply L660_VCC. The UART_TXD pin of the L660XL chip is connected to one end of the seventh resistor and the emitter of the second transistor. The other end of the seventh resistor is connected to one end of the eighth resistor and the base of the second transistor. The other end of the eighth resistor is connected to the power supply VDD-1.

8. The collector of the second transistor is connected to one end of the ninth resistor and the socket, respectively. The other end of the ninth resistor is connected to the power supply L660_VCC. The WAKEUP_IN pin of the L660XL chip is connected to the socket. The VDD_EXT pin of the L660XL chip is connected to one end of the sixth capacitor, and the other end of the sixth capacitor is grounded. The second GND pin and the third GND pin of the L660XL chip are both grounded. The ANT_RF pin of the L660XL chip is connected to one end of the tenth resistor and one end of the seventh capacitor, respectively. The other end of the seventh capacitor is grounded. The other end of the tenth resistor is connected to one end of the eighth capacitor, one end of the fifth ESD protection diode, and one end of the IPEX antenna mount, respectively. The other end of the eighth capacitor is grounded. The other end of the fifth ESD protection diode is grounded. The IPEX antenna mount... The other end of the connector is grounded. The fourth and fifth GND pins of the L660XL chip are both grounded. The DBG_RXD and DBG_TXD pins of the L660XL chip are both connected to the socket. The sixth and seventh GND pins of the L660XL chip are both grounded. The first and second VBAT pins of the L660XL chip are both connected to the power supply L660_VCC. One end of the first electrolytic capacitor, one end of the ninth capacitor, one end of the tenth capacitor, one end of the eleventh capacitor, and one end of the twelfth capacitor are all connected to the power supply L660_VCC. The other ends of the first electrolytic capacitor, the ninth capacitor, the tenth capacitor, the eleventh capacitor, and the twelfth capacitor are all grounded.

3. An ultrasonic gas meter according to claim 1, characterized in that, The gas meter processor includes an FM33FR058 chip, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a thirteenth capacitor, a fourteenth capacitor, a fifteenth capacitor, a sixteenth capacitor, a seventeenth capacitor, a first interface, and a second interface. The PA1 / TO04 / TI04 / COMP2_INN / LUT2_OUT pins of the FM33FR058 chip are connected to the button circuit. The PA3 / SWCLK / UART3_RX pins of the FM33FR058 chip are connected to the first pin of the first interface and one end of the eleventh resistor, respectively. The PA4 / SWIO / UART3_TX pins of the FM33FR058 chip are connected to the second pin of the first interface and one end of the twelfth resistor, respectively. The third pin of the first interface, the other end of the eleventh resistor, and the... The other end of the twelfth resistor is connected to the power supply VDD. The fourth pin of the first interface is grounded. The PA7 / SEG39 / LED_DIG21 / FOUT1 pins of the FM33FR058 chip are connected to the button circuit. The PA9 / XTHFO pin of the FM33FR058 chip is connected to the cover opening detection circuit. The REGC pin of the FM33FR058 chip is connected to one end of the thirteenth resistor. The other end of the thirteenth resistor is connected to one end of the thirteenth capacitor. The VSS pin of the FM33FR058 chip and the FM33FR05... The VSSA pin of the FM33FR058 chip, the other end of the thirteenth capacitor, one end of the fourteenth capacitor, and one end of the fifteenth capacitor are all grounded. The VDDA pin of the FM33FR058 chip, the VDD pin of the FM33FR058 chip, the other end of the fourteenth capacitor, and the other end of the fifteenth capacitor are all connected to the power supply VDD. The PB0 / UART3_RX / SCLA0 pin of the FM33FR058 chip is connected to the first pin of the second interface and one end of the fourteenth resistor, respectively. The PB1 / UART3 pin of the FM33FR058 chip... The _TX / SDAA0 pins are connected to the second pin of the second interface and one end of the fifteenth resistor, respectively. The other ends of the fourteenth and fifteenth resistors are both connected to the power supply VDD. The third pin of the second interface is grounded. The PB2 / WKUP2 / SEG40 / UART4_RX / SCLA1 pin, PB3 / SEG41 / UART4_TX / SDAA1 pin, PB6 / COM0 / LED_SEG0 / TI11 / TO11 pin, PB7 / COM1 / LED_SEG1 / TI02 / TO02 pin, and PB8 / COM2 / LED_SEG2 / TI11 / TI11 pin of the FM33FR058 chip are also connected.Pins 13 / TO13, PB9 / COM3 / LED_SEG3 / UART0_TX of the FM33FR058 chip, PB10 / COM4 / SEG28 / LED_SEG4 / UART0_RX of the FM33FR058 chip, PB11 / COM5 / SEG29 / LED_SEG5 / TI12 / TO12 / SMB0_ALERTB of the FM33FR058 chip, PE0 / SEG4 / TS00 / LED_DIG4 / SPI 0_SCK / SCL1 of the FM33FR058 chip, PE1 / SEG5 / TS01 / LED_DIG5 / SPI0_SSN / TI06 / TO06 of the FM33FR058 chip, and PE2 / SEG6 / TS02 / LED_DIG6 / SPI 3_SSN / TI06 of the FM33FR058 chip. Pins 05 / TO05, PE3 / SEG7 / TS03 / LED_DIG7 / SCL2 / SPI 3_SCK / LPT16_CH1 of the FM33FR058 chip, PE4 / SEG8 / LED_DIG8 / TS04 / SDA2 / SPI 3_MISO / LPT16_CH2 of the FM33FR058 chip, PE5 / SEG9 / LED_DIG9 / SPI 3_MOSI of the FM33FR058 chip, PE6 / SEG10 / LED_DIG10 / SPI 2_MOSI of the FM33FR058 chip, PE7 / SEG11 / LED_DIG11 / SPI2_MOSI of the FM33FR058 chip, and PE8 / SEG12 / LED_DIG12 / SCL3 / SPI of the FM33FR058 chip. 2_SCK / COMP1_OUT pin, PC0 / SEG13 / LED_DIG13 / SPI 3_SCK / COMP2_OUT pin of the FM33FR058 chip, PC3 / SEG16 / TS05 / ATIM_CH3(TI02)(TO02) / SPI2_SCK / SCL0 pin of the FM33FR058 chip, PC4 / SEG17 / TS06 / UART2_RX / ATIM_CH4(TI) pin of the FM33FR058 chip,03)(TO03) / SPI2_MISO / SDA0 pin, PC5 / SEG18 / UART2_TX / ATIM_CHIN(TI04)(TO04) / SPI2_MOSI pin of the FM33FR058 chip, PC6 / WKUP4 / SEG19 / UART5_TX / SPI2_MOSI / ATIMCH2N(TI05)(TO05) pin of the FM33FR058 chip, PC7 / SEG20 / UART5_RX / SPI2_MISO / ATIM_CH3N(TI06)(TO06) pin of the FM33FR058 chip, PC8 / SEG21 / SPI 2_SCK / SCLLA0 / (TI07)(TO07) pins, PC9 / SEG22 / LED_DIG22 / SPI2_SSN / SDAA0 pins of the FM33FR058 chip, PC10 / WKUP5 / SEG23 / LED_DIG23 / TI of the FM33FR058 chip The following pins are associated with the FM33FR058 chip: 10 / TO10 / SMB0_ALERTB, PC11 / SEG24 / LED_DIG24 / ADC_IN6 / FOUT0 / MCLK2, PC12 / SEG25 / LED_DIG25 / ADC_IN13 / ANATST / MCLK3, PC13 / SEG26 / LED_DIG26 / ADC_IN17 / LUT0_OUT, PC14 / SEG27 / LED_DIG27 / ADC_IN18 / LUT1_OUT, and PC15 / WKUP6 / SEG0 / LED_DIG28 / FOUT0. The following pins are associated with the FM33FR058 chip: / ADC_IN0, PD0 / SEG1 / LED_DIG29 / UART5_RX / ADC_IN7, PD1 / SEG2 / LED_DIG30 / UART5_TX / ADC_IN1, PD2 / SEG3 / LED_DIG31 / ADC_IN8, PD3 / SEG32 / LED_DIG14 / ADC_IN2, PD4 / SEG33 / LED_DIG15 / ADC_IN9, and PD13 / SEG37 / LED_DIG19 / UART2_TX / SPI.1_MOSI / SMB1_ALERTB pins and the PD8 / SEG38 / LED_DIG20 / SDAA1 / UART2_RX / SPI pins of the FM33FR058 chip. The 1_MISO pin is connected to the display screen. The PB15 / LED_DIG3 / SPIO_MISO / SDA1 pins of the FM33FR058 chip are connected to the fourth pin of the second interface. The PD7 / WKUP1 / TS07 / ADC_IN16 pins of the FM33FR058 chip are connected to the valve control circuit. The PE9 / VREFN / TS08 / ADC_IN15 pins of the FM33FR058 chip, one end of the sixteenth capacitor, and one end of the seventeenth capacitor are all grounded. The PE10 / VREFP / TS09 / ADC_IN14 pins of the FM33FR058 chip, the other end of the sixteenth capacitor, and the other end of the seventeenth capacitor are all connected to the power supply VDD. The PA10 / TS10 / SCL1 / SPI 1_SCK pins and the PA11 / TS11 / SDA1 / UART5_RX / SPI pins of the FM33FR058 chip are also connected to the power supply VDD. The 1_MISO / ADC_IN5 pin and the PA12 / TS12 / UART5_TX / SPI 1_MOSI / ADC_IN12 pins of the FM33FR058 chip are all connected to the infrared interface circuit. The PD11 / TS13 / SEG35 / LED_DIG17 / TO00 / SPI 1_SSN / UART4_RX pins of the FM33FR058 chip and the PD12 / SEG36 / LED_DIG18 / TI00 / UART4_TX / MCK1 pins of the FM33FR058 chip are all connected to the valve control circuit.

4. An ultrasonic gas meter according to claim 1, characterized in that, The cover opening detection circuit includes a first switching element, a second switching element, a sixteenth resistor, a seventeenth resistor, and an eighteenth resistor. One end of the sixteenth resistor is connected to the gas meter processor, and the other end of the sixteenth resistor is connected to one end of the seventeenth resistor and one end of the eighteenth resistor. The other end of the seventeenth resistor is grounded, and the other end of the eighteenth resistor is connected to the first NC pin of the first switching element, the second NC pin of the first switching element, and the COM pin of the second switching element. The first COM pin of the first switching element, the second COM pin of the first switching element, and the NC pin of the second switching element are all connected to the power supply VDD.

5. An ultrasonic gas meter according to claim 1, characterized in that, The valve control circuit includes an L9110S / AT9110AT chip, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, an eighteenth capacitor, a nineteenth capacitor, a twentieth capacitor, and a twenty-first capacitor. The OA pin of the L9110S / AT9110AT chip is connected to one end of the eighteenth capacitor. The other end of the eighteenth capacitor is connected to one end of the nineteenth resistor. The other end of the nineteenth resistor is connected to the OB pin of the L9110S / AT9110AT chip. The first VCC pin of the L9110S / AT9110AT chip, the second VCC pin of the L9110S / AT9110AT chip, one end of the nineteenth capacitor, and one end of the twentieth capacitor are all connected to the power supply VCC_CAP. The other end of the nineteenth capacitor and the twentieth capacitor... The other end of each capacitor is grounded. The first GND pin of the L9110S / AT9110AT chip is connected to the second GND pin of the L9110S / AT9110AT chip, one end of the twentieth resistor, and one end of the twentieth eleventh resistor, respectively. The other end of the twentieth resistor is grounded. The other end of the twentieth resistor is connected to one end of the twentieth eleventh capacitor. The other end of the twentieth eleventh capacitor is grounded. The IA pin and the IB pin of the L9110S / AT9110AT chip are both connected to the gas meter processor.

6. An ultrasonic gas meter according to any one of claims 1 to 4, characterized in that, The ultrasonic gas meter also includes an ultrasonic base meter interface circuit. The ultrasonic baseplate interface circuit includes a third interface, a fourth interface, a twenty-second resistor, and a twenty-third resistor. The first pin of the third interface is connected to the first pin of the fourth interface and one end of the 22nd resistor, and the other end of the 22nd resistor is connected to the gas meter processor. The second pin of the third interface is connected to the second pin of the fourth interface and one end of the 23rd resistor, and the other end of the 23rd resistor is connected to the gas meter processor. The third pin of the third interface is grounded. The fourth pin of the third interface is connected to the gas meter processor. The fifth pin of the third interface is connected to the third pin of the fourth interface. The fourth pin of the fourth interface is grounded. The sixth pin and the seventh pin of the third interface are both connected to the valve control circuit.

7. An ultrasonic gas meter according to claim 1, characterized in that, The ultrasonic gas meter also includes a power supply circuit, which comprises an MD5330 chip, an MD53R33 chip, a thermistor, a diode, a 24th resistor, a 22nd capacitor, a 23rd capacitor, a 24th capacitor, a second electrolytic capacitor, a third electrolytic capacitor, and a fourth electrolytic capacitor. The GND pin of the MD5330 chip, one end of the 22nd capacitor, one end of the 2nd electrolytic capacitor, one end of the 23rd capacitor, and one end of the 3rd electrolytic capacitor are all grounded. The VIN pin of the MD5330 chip, the other end of the 22nd capacitor, one end of the 4th electrolytic capacitor, the VIN pin of the MD53R33 chip, and the cathode of the diode are all connected to the power supply VCC_CAP. The other end of the 4th electrolytic capacitor is connected to the other end of the 2nd electrolytic capacitor. The anode of the diode is connected to one end of the thermistor, and the other end of the thermistor is connected to the power supply VCC_M1. The OUT pin of the MD5330 chip, the other end of the 23rd capacitor, and the other end of the 3rd electrolytic capacitor are all connected to the power supply VDD. The GND pin of the MD53R33 chip and one end of the 24th capacitor are grounded. The other end of the 24th capacitor and the OUT pin of the MD53R33 chip are all connected to the power supply networkVcc. The EN pin of the MD53R33 chip is connected to one end of the 24th resistor, and the other end of the 24th resistor is connected to the gas meter processor.

8. An ultrasonic gas meter according to claim 7, characterized in that, The ultrasonic gas meter also includes a power detection circuit, which comprises a 25th resistor, a 26th resistor, a 27th resistor, a 28th resistor, a third transistor, and a fourth transistor. One end of the 25th resistor is connected to the gas meter processor, and the other end of the 25th resistor is connected to the base of the third transistor. The emitter of the third transistor is grounded, and the collector of the third transistor is connected to one end of the 26th resistor. The other end of the 26th resistor is connected to the base of the fourth transistor. The emitter of the fourth transistor is connected to the power supply VCC_MLi, and the collector of the fourth transistor is connected to one end of the 27th resistor. The other end of the 27th resistor is connected to one end of the 28th resistor and the gas meter processor, respectively, and the other end of the 28th resistor is grounded.

9. An ultrasonic gas meter according to claim 1, characterized in that, The ultrasonic gas meter also includes a communication circuit, which comprises a CONN-8P interface, a 29th resistor, a 30th resistor, a 31st resistor, a 32nd resistor, a 33rd resistor, a 34th resistor, a 35th resistor, a 36th resistor, and a 5th transistor. The first pin of the CONN-8P interface is connected to one end of the twenty-ninth resistor, and the other end of the twenty-ninth resistor is connected to the gas meter processor. The second pin of the CONN-8P interface is connected to the collector of the fifth transistor. The emitter of the fifth transistor and one end of the thirtieth resistor are both grounded. The base of the fifth transistor is connected to the other end of the thirtieth resistor and one end of the thirty-first resistor, respectively. The other end of the thirty-first resistor is connected to the gas meter processor. The third pin of the CONN-8P interface is connected to one end of the thirty-second resistor, and the other end of the thirty-second resistor is connected to the gas meter processor. The CONN-8P interface is connected as follows: pin 4 is connected to one end of resistor 33 and one end of resistor 34; the other end of resistor 33 is connected to the gas meter processor; the other end of resistor 34 and one end of resistor 35 are both connected to power supply VDD; the other end of resistor 35 is connected to pin 5 of the CONN-8P interface and one end of resistor 36; the other end of resistor 36 is connected to the gas meter processor; pin 6 of the CONN-8P interface is grounded; and pin 7 of the CONN-8P interface is connected to power supply networkVcc.

10. An ultrasonic gas meter according to claim 1, characterized in that, The ultrasonic gas meter also includes a low-voltage reset detection circuit, which comprises an X61 CN2202 chip, a 37th resistor, and a 25th capacitor. The Vout pin of the X61 CN2202 chip is connected to the gas meter processor, one end of the thirty-seventh resistor, and one end of the twenty-fifth capacitor, respectively. The other end of the thirty-seventh resistor is connected to the power supply VDD, and the other end of the twenty-fifth capacitor is grounded. The GND pin of the X61 CN2202 chip is grounded, and the Vin pin of the X61 CN2202 chip is connected to the power supply VDD.

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