阅读说明：本技术 一种冷库多气体检测仪 (Many gaseous detectors of freezer ) 是由 贺贤俊 陈晓琪 刘东东 于 2018-07-22 设计创作，主要内容包括：一种冷库多气体检测仪,属于传感器检测技术领域,是主要由温度传感器、二氧化碳传感器、乙炔传感器、氧气传感器、信号调理电路、AD转换模块、单片机、键盘模块、声光报警模块、气泵控制模块和上位机组成的,其特征在于：所述信号调理电路和AD转换模块相连接,AD转换模块和单片机相连接,键盘模块、声光报警模块和气泵控制模块均和单片机相连接,上位机和单片机相连接,本发明的设计合理、实用性强,在果蔬品或密封食品保质保鲜等方面具有较好的推广价值,有实时性好,操作简单,便于携带等优点。(The utility model provides a many gas detection of freezer appearance, belongs to sensor detection technical field, is mainly by temperature sensor, carbon dioxide sensor, acetylene sensor, oxygen sensor, signal conditioning circuit, AD conversion module, singlechip, keyboard module, audible-visual alarm module, air pump control module and host computer and constitutes its characterized in that: the signal conditioning circuit is connected with the AD conversion module, the AD conversion module is connected with the single chip microcomputer, the keyboard module, the sound-light alarm module and the air pump control module are all connected with the single chip microcomputer, and the upper computer is connected with the single chip microcomputer.)

1. The utility model provides a many gas detection of freezer appearance is mainly become by temperature sensor, carbon dioxide sensor, acetylene sensor, oxygen sensor, signal conditioning circuit, AD conversion module, singlechip, keyboard module, audible-visual alarm module, air pump control module and host computer, its characterized in that: temperature sensor and carbon dioxide sensor all set up the input at the singlechip, and acetylene sensor and oxygen sensor all are connected with signal conditioning circuit, and signal conditioning circuit is connected with AD conversion module, and AD conversion module is connected with the singlechip, and keyboard module, audible-visual alarm module and air pump control module all are connected with the singlechip, and host computer and singlechip are connected.

2. The multi-gas detector for the refrigerator according to claim 1, wherein: the carbon dioxide sensor of the signal conditioning circuit is provided with 4 pins, VCC and GND are power supply two poles of the sensor, RX and TX are output ports of RS232 digital communication of the sensor, RX and TX ports are directly connected with a USARTO serial interface on a singlechip, and a timer T is adopted for processing sending and receiving time₀The method comprises an interruption method, wherein a sensor VCC is connected with 3.3V, an oxygen sensor adopts an external high-precision bridge AD7797 to realize oxygen sensor signal acquisition, the AD7797 comprises sigma- △ type ADC, and 24-bit resolution, 2.5V reference voltage is generated by an ADR391B element to be used as reference voltage of the bridge and offset voltage of the oxygen sensor, the ADR391B has the advantages of low output noise, high precision and the like, and after AIN which inputs 0-20 mV voltage signals into the bridge is processed, the voltage signals are converted into ADC values which change between 0X 0000-0X 028FSC 29.

3. The multi-gas detector for the refrigerator according to claim 1, wherein: the upper computer is connected with the single chip microcomputer, an analog signal switch circuit and a USB-to-serial port UART circuit are adopted, and an Ezhu liquid crystal display circuit of the liquid crystal display is directly connected with the analog signal switch circuit for displaying. The CP2102 is adopted to carry out USB and DART serial port conversion, and DART serial port conversion USB circuits are built through the CP 2102. A decoupling capacitor connected in parallel with 1.0 muF is required to be added at the REGIN end, a power supply source of the CP2102 is provided by a USB interface, a TVS is selected for protection, and the decoupling capacitor connected in parallel with 0.1 muF is added between VCC and GND.

Technical Field

The invention relates to a multi-gas detector for a refrigeration house, and belongs to the technical field of sensor detection.

Background

The cold storage greatly solves the contradiction of 'rotten in busy seasons and off in slack seasons' of fresh fruits and vegetables in China, not only provides a high-quality nutrient source, but also prolongs the supply period of the fruits and vegetables. The real-time detection of the gas components is vital to maintaining the normal operation of the refrigeration house. Most of the traditional detection equipment adopts an austenite gas analyzer, but has the defects of complex operation, poor real-time performance, inconvenience in carrying and the like. The environment of the refrigeration house has the characteristics of low temperature, high humidity, large gas content fluctuation and frequent measurement, most gas detection equipment developed at home and abroad detects smoke and combustible gas, and a multi-gas detector integrating oxygen, carbon dioxide, acetylene and temperature for the refrigeration house does not exist. Therefore, the research and development of a special high-performance portable multi-gas detector for a refrigeration house is particularly important. The invention develops a multi-gas detector for a refrigeration house.

Disclosure of Invention

Aiming at the defects, the invention provides a multi-gas detector for a refrigeration house.

The invention is realized by the following technical scheme: the utility model provides a many gas detection of freezer appearance is mainly become by temperature sensor, carbon dioxide sensor, acetylene sensor, oxygen sensor, signal conditioning circuit, AD conversion module, singlechip, keyboard module, audible-visual alarm module, air pump control module and host computer, its characterized in that: temperature sensor and carbon dioxide sensor all set up the input at the singlechip, and acetylene sensor and oxygen sensor all are connected with signal conditioning circuit, and signal conditioning circuit is connected with AD conversion module, and AD conversion module is connected with the singlechip, and keyboard module, audible-visual alarm module and air pump control module all are connected with the singlechip, and host computer and singlechip are connected.

The carbon dioxide sensor of the signal conditioning circuit is provided with 4 pins, VCC and GND are power supply two poles of the sensor, RX and TX are output ports of RS232 digital communication of the sensor, RX and TX ports are directly connected with a USARTO serial interface on a singlechip, and a timer T is adopted for processing sending and receiving time₀The method comprises an interruption method, wherein a sensor VCC is connected with 3.3V, an oxygen sensor adopts an external high-precision bridge AD7797 to realize oxygen sensor signal acquisition, the AD7797 comprises sigma- △ type ADC, and 24-bit resolution, 2.5V reference voltage is generated by an ADR391B element to be used as reference voltage of the bridge and offset voltage of the oxygen sensor, the ADR391B has the advantages of low output noise, high precision and the like, and after AIN which inputs 0-20 mV voltage signals into the bridge is processed, the voltage signals are converted into ADC values which change between 0X 0000-0X 028FSC 29.

The upper computer is connected with the single chip microcomputer, an analog signal switch circuit and a USB-to-serial port UART circuit are adopted, and an Ezhu liquid crystal display circuit of the liquid crystal display is directly connected with the analog signal switch circuit for displaying. The CP2102 is adopted to carry out USB and DART serial port conversion, and DART serial port conversion USB circuits are built through the CP 2102. A decoupling capacitor connected in parallel with 1.0 muF is required to be added at the REGIN end, a power supply source of the CP2102 is provided by a USB interface, a TVS is selected for protection, and the decoupling capacitor connected in parallel with 0.1 muF is added between VCC and GND.

The invention has the advantages that: the fruit and vegetable packaging box has the advantages of reasonable design, strong practicability, good popularization value in the aspects of quality and freshness preservation of fruits and vegetables or sealed food and the like, good real-time performance, simplicity in operation, convenience in carrying and the like.

Drawings

FIG. 1 is a schematic diagram of the system of the present invention.

In the figure, the device comprises a temperature sensor 1, a carbon dioxide sensor 2, an acetylene sensor 3, an oxygen sensor 4, a signal conditioning circuit 5, an AD conversion module 6, a singlechip 7, a keyboard module 8, a keyboard module 9 and an audible and visual alarm module.

Detailed Description

The utility model provides a many gas detection of freezer appearance mainly comprises temperature sensor 1, carbon dioxide sensor 2, acetylene sensor 3, oxygen sensor 4, signal conditioning circuit 5, AD conversion module 6, singlechip 7, keyboard module 8 and acousto-optic warning module 9, its characterized in that: temperature sensor 1 and carbon dioxide sensor 2 all set up the input at singlechip 7, and acetylene gas sensor 3 and oxygen sensor 4 all are connected with signal conditioning circuit 5, and signal conditioning circuit 5 is connected with AD conversion module 6, and AD conversion module 6 is connected with singlechip 7, and keyboard module 8, audible-visual alarm module 9 and air pump control module 10 all are connected with singlechip 7, and host computer 11 is connected with singlechip 7.

The signal conditioning circuit 5, the carbon dioxide sensor has 4 pins, VCC, GND are the power supply two poles of the world, RX, TX are sensor RS232 digital communication output port, use RX, TX port is direct with the USARTO serial interface connection on the singlechip, the processing of sending and receiving time adopts timer T₀An interrupt method, in which the VCC of sensor is connected to 3.3V, and the oxygen sensor adopts an external high-precision bridge AD7797 to realize OZ sensor signal acquisition, the AD7797 contains sigma- △ type ADC, 24-bit resolution is realized by ADR391B elementThe ADR391B has the advantages of low output noise, high precision and the like, and converts the AIN which inputs a voltage signal of 0-20 mV into the bridge into ADC value which changes between 0X 00000000-0X 028FSC29 after being processed.

The upper computer 11 is connected with the singlechip 7, an analog signal switch circuit and a USB-to-serial port UART circuit are adopted, and an Ezhu liquid crystal display circuit of the liquid crystal display is directly connected with the analog signal switch circuit for displaying. The CP2102 is adopted to carry out USB and DART serial port conversion, and DART serial port conversion USB circuits are built through the CP 2102. A decoupling capacitor connected in parallel with 1.0 muF is required to be added at the REGIN end, a power supply source of the CP2102 is provided by a USB interface, a TVS is selected for protection, and the decoupling capacitor connected in parallel with 0.1 muF is added between VCC and GND.

When the device works, the temperature sensor DS 18B20 and the carbon dioxide sensor COZIR-W transmit the acquired temperature and carbon dioxide signals to the single chip microcomputer for operation processing, the acetylene sensor C2H4/C-10 and the oxygen sensor AO2PTB 18.10 transmit the acquired signals to the signal conditioning circuit for processing, the signals are converted by the AD conversion module and transmitted to the single chip microcomputer Atmega325 for operation processing, the signal conditioning circuit comprises a battery voltage acquisition circuit, and the single chip microcomputer displays the data of the concentration, the temperature, the battery electric quantity and the like of corresponding gas on the liquid crystal display screen in real time. The instrument adopts a single air inlet, a plurality of sensors are connected in series into an air path, and air flows through the air inlet, the air pump, the carbon dioxide sensor, the acetylene sensor, the oxygen sensor and the air outlet. If the gas concentration exceeds the standard, the temperature is too high or the battery power is insufficient, the singlechip can drive the sound-light alarm module to alarm.

It will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in the embodiments described above without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims.