CN210322872U - Freon leakage detection system based on singlechip - Google Patents
Freon leakage detection system based on singlechip Download PDFInfo
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- CN210322872U CN210322872U CN201920886887.7U CN201920886887U CN210322872U CN 210322872 U CN210322872 U CN 210322872U CN 201920886887 U CN201920886887 U CN 201920886887U CN 210322872 U CN210322872 U CN 210322872U
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Abstract
A Freon leakage detection system based on a single chip microcomputer relates to the technical field of industrial monitoring and comprises a host system and a slave system; the slave system comprises a gas detection module and a slave single-chip microcomputer processing module, wherein the detection module detects the concentration of specific gas in the air through a gas sensor, converts the concentration of the specific gas into a voltage signal, and then transmits the voltage signal to an ADC (analog-to-digital converter) conversion module in the single-chip microcomputer processing module after filtering and amplifying through a filter, so that an analog signal is converted into a digital signal; the host system comprises a communication module, a human-computer interaction interface and a host single-chip microcomputer processing module; the communication module is used for carrying out data communication with the slave system, the human-computer interaction interface is used for controlling the whole system by a user, and the host single-chip microcomputer processing module is used for analyzing and processing data received by the slave system and user input data. Automatic monitoring can be realized, the coverage is wide, monitoring is accurate, and effective guarantee is provided for industrial production safety.
Description
Technical Field
The utility model relates to an industrial monitoring technology field especially relates to a freon leak testing system based on singlechip.
Background
The Freon is a general name of several kinds of chlorofluoromethanes and chlorofluoroethane, is a raw material of products such as a refrigerant, a foaming agent, a cleaning agent and the like, is widely used for industrial equipment such as refrigeration equipment, electrical equipment and the like, is colorless gas or volatile liquid at normal temperature and normal pressure, is tasteless/slightly smelly, non-toxic/low-toxic and has relatively stable gas chemical properties. However, due to its particularity, freon gas destroys the ozone layer, causes a series of environmental problems such as greenhouse effect, influences ecological balance, and causes certain damage to human body.
Hazards of freon leakage: (1) the Freon is colorless and odorless and is not easy to be perceived by people, and the oxygen concentration in the air can be reduced when the Freon is discharged into the air, so that people can suffocate; (2) freon does not burn and explode, but the gas of the Freon can generate poisonous phosgene when meeting open fire, thus being harmful to human health; (3) the Freon has low solubility to water, and if water exists in a refrigeration loop, the water is very likely to be separated out and frozen into ice at the throttle hole of the expansion valve to block pipelines of equipment such as an air conditioner and the like; (4) freon has a corrosive effect on common rubber; (5) the freon rises along with the temperature, and pressure sharply rises, and improper storage has explosion risk, so the refrigerant should be stored in the environment below 40 ℃ to avoid high-temperature storage.
In view of the harmfulness of freon leakage, whether there is the condition of leaking refrigerant freon in the necessary monitoring equipment in the industrial production link, whether the content of installing corresponding freon sensor freon monitoring equipment belongs to normal range, in case take place unusually, can send the warning at the very first time, remind operating personnel to inspect the troubleshooting, guarantee personal and property safety.
Disclosure of Invention
An object of the utility model is to solve the above-mentioned problem among the prior art, provide a freon leak testing system based on singlechip, can realize automatic monitoring, coverage is wide moreover, and the monitoring is accurate, provides effective guarantee for industrial production safety.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a Freon leakage detection system based on a single chip microcomputer comprises a host system, a slave system and a communication module;
the slave system comprises a gas detection module and a slave single-chip microcomputer processing module; the detection module comprises a gas sensor and a filter, a +5V power supply is added to a power supply end of the gas sensor, the slave single-chip microcomputer processing module is provided with an ADC (analog-to-digital converter) conversion module, the gas sensor is connected with the filter, and the filter is connected with the ADC conversion module, wherein the gas sensor is used for detecting the concentration of specific gas in the air, converting the concentration of the specific gas into a voltage signal, filtering and amplifying the voltage signal by the filter and transmitting the voltage signal to the ADC conversion module, so that an analog signal is converted into; the slave single-chip microcomputer processing module is used for analyzing and processing data received by the gas sensor and an instruction issued by the host system;
the host system comprises a human-computer interaction interface and a host single-chip microcomputer processing module; the human-computer interaction interface is connected with the host single-chip microcomputer processing module, the human-computer interaction interface is used for controlling the whole system by a user, and the host single-chip microcomputer processing module is used for analyzing and processing data received by the slave system and user input data;
the communication module is connected with the slave single-chip microcomputer processing module and the host single-chip microcomputer processing module and is used for data communication between the host system and the slave system.
The slave system also comprises an alarm module, wherein the alarm module is connected with the ADC conversion module and is used for starting an alarm device when the gas detection module detects that the concentration of Freon around the sensor reaches an alarm threshold value.
The gas sensor adopts an MQ137 gas sensor.
Host computer singlechip processing module adopts the USART serial ports mode, communication module adopts RS485 communication module, and host computer system and the application MODBUS agreement of following the computer system realize asynchronous communication.
The processing module of the host single chip microcomputer adopts STM32F101CBT6 series ARM chips, pins PA9 and PA10 of the processing module of the host single chip microcomputer are set as synchronous transceivers to synchronously receive and transmit data with a human-computer interaction interface, and pins PB10 and PB11 of the processing module of the host single chip microcomputer are set as asynchronous transceivers to realize asynchronous communication with a slave system.
The slave single-chip microcomputer processing module adopts an ATmega8-8AU chip, pins PD0 and PD1 of the ATmega8-8AU chip are set to be asynchronous transceivers to achieve asynchronous communication with a host system, the pin ADC7 receives signals conditioned by the gas detection module to achieve analog-to-digital conversion of analog signals, the pin PD5 achieves the function of signal output, and the slave single-chip microcomputer processing module can enable the pin PD5 to output high level.
The human-computer interaction interface is communicated with the host single-chip microcomputer processing module in an RS232 serial port card mode and receives a user control instruction.
Compared with the prior art, the utility model discloses technical scheme obtains beneficial effect is:
the utility model is suitable for an enterprise detects its place that probably produces freon gas leakage when industrial production or use freon to products such as raw materials preparation refrigerant, foamer, cleaner, is suitable for and the coverage is wide, can realize automatic monitoring, provides effective guarantee for industrial production safety.
Drawings
FIG. 1 is a schematic diagram of network connections between a master system and a slave system and an RS485 communication module;
FIG. 2 is a communication interface diagram of the human-computer interaction interface and the host single-chip microcomputer module;
FIG. 3 is a circuit diagram of a host single-chip microcomputer processing module;
FIG. 4 is a circuit diagram of a gas detection module;
FIG. 5 is a circuit diagram of an alarm module;
FIG. 6 is a circuit diagram of a slave singlechip processing module;
fig. 7 is a circuit diagram of an RS485 communication module.
Detailed Description
In order to make the technical problem, technical solution and beneficial effects to be solved by the present invention clearer and more obvious, the following description is made in detail with reference to the accompanying drawings and embodiments.
As shown in fig. 1 and 7, the present invention includes a master system, a slave system and a communication module; the communication module is connected with a slave single-chip microcomputer processing module of the slave system and a host single-chip microcomputer processing module of the host system, and the communication module is used for data communication between the host system and the slave system; host computer singlechip processing module adopts the USART serial ports mode, communication module adopts RS485 communication module, and host computer system and the application MODBUS agreement of following the computer system realize asynchronous communication.
As shown in fig. 2-3, the host system includes a human-computer interaction interface and a host single-chip processing module;
the human-computer interaction interface is connected with the host single-chip microcomputer processing module, the human-computer interaction interface is used for controlling the whole system by a user, the human-computer interaction interface realizes information interaction between the user and the detection system, and the user can realize input of user data in a human-computer interface touch mode, so that bidirectional communication between the user and the detection system is realized; specifically, the human-computer interaction interface is communicated with a host single-chip microcomputer processing module in an RS232 serial port card mode and receives a user control instruction, the human-computer interaction interface is designed by adopting a desktop HMI (human machine interface), and the design interface comprises a system state interface, a probe monitoring interface, a checking alarm interface and a system setting interface;
the host single-chip microcomputer processing module is used for analyzing and processing data received from the slave system and user input data; the processing module of the host single chip microcomputer adopts STM32F101CBT6 series ARM chips, pins PA9 and PA10 of the processing module of the host single chip microcomputer are set as synchronous transceivers to synchronously receive and transmit data with a human-computer interaction interface, and pins PB10 and PB11 of the processing module of the host single chip microcomputer are set as asynchronous transceivers to realize asynchronous communication with a slave system.
As shown in fig. 4-6, the slave system comprises a gas detection module, a slave single-chip microcomputer processing module and an alarm module;
the detection module comprises a gas sensor and a filter, the slave single-chip microcomputer processing module is provided with an ADC conversion module, the gas sensor is connected with the filter, and the filter is connected with the ADC conversion module; the gas sensor adopts an MQ137 gas sensor, the resistivity of the MQ137 gas sensor is reduced along with the rise of the concentration of Freon, a +5V power supply is added at the power supply end of the MQ137 gas sensor, current flows through the sensor, the concentration of Freon in the air is detected through the gas sensor, the voltage at two ends of the MQ137 gas sensor under the gas concentration can be converted, the voltage is filtered and amplified through a Butterworth filter formed by LM358 and then is sent to an ADC conversion module, an analog signal is converted into a digital signal, and the current concentration of Freon gas can be calculated after the singlechip is analyzed and processed;
the slave single-chip microcomputer processing module is used for analyzing and processing data received by the gas sensor and an instruction issued by the host system; the slave single-chip microcomputer processing module adopts an ATmega8-8AU chip, pins PD0 and PD1 of the ATmega8-8AU chip are set to be asynchronous transceivers to realize asynchronous communication with a host system, the pin ADC7 receives signals conditioned by the gas detection module to realize analog-to-digital conversion of analog signals, the pin PD5 realizes a signal output function, and when a certain condition is met, the slave single-chip microcomputer processing module can enable the pin PD5 to output a high level;
the alarm module is connected with the ADC conversion module, when the gas concentration reaches a threshold value set by a user, the slave single-chip microcomputer processing module sets a PD5 pin to be at a high level, so that the triode DTC114YCA is conducted, the relay HRS1 acts, namely, a switch of the audible and visual alarm device is switched on, the audible and visual alarm device is enabled to give an alarm, and the audible and visual alarm device is started to warn the user to take corresponding measures.
The working principle of the utility model is as follows:
in the host system, a user inputs a control instruction through a human-computer interaction interface, the host single-chip microcomputer processing module receives the control instruction input by the user, and after analysis and processing, the communication between the host system and the slave system is realized by using an MODBUS protocol in a USART serial port mode of the host single-chip microcomputer processing module; in the slave system, the gas detection module can detect the concentration of Freon around the gas sensor, convert the gas concentration into a voltage value with a corresponding magnitude, amplify the voltage value by a filter, transmit a signal to an ADC conversion module of the slave singlechip processing module, analyze and process the signal by the slave singlechip processing module, and judge whether the concentration of Freon exceeds a set threshold value so as to determine whether to start the audible and visual alarm device.
Claims (7)
1. The utility model provides a freon leakage detection system based on singlechip which characterized in that: the system comprises a host system, a slave system and a communication module;
the slave system comprises a gas detection module and a slave single-chip microcomputer processing module; the detection module comprises a gas sensor and a filter, a +5V power supply is added to a power supply end of the gas sensor, the slave single-chip microcomputer processing module is provided with an ADC (analog-to-digital converter) conversion module, the gas sensor is connected with the filter, and the filter is connected with the ADC conversion module, wherein the gas sensor is used for detecting the concentration of specific gas in the air, converting the concentration of the specific gas into a voltage signal, filtering and amplifying the voltage signal by the filter and transmitting the voltage signal to the ADC conversion module, so that an analog signal is converted into; the slave single-chip microcomputer processing module is used for analyzing and processing data received by the gas sensor and an instruction issued by the host system;
the host system comprises a human-computer interaction interface and a host single-chip microcomputer processing module; the human-computer interaction interface is connected with the host single-chip microcomputer processing module, the human-computer interaction interface is used for controlling the whole system by a user, and the host single-chip microcomputer processing module is used for analyzing and processing data received by the slave system and user input data;
the communication module is connected with the slave single-chip microcomputer processing module and the host single-chip microcomputer processing module and is used for data communication between the host system and the slave system.
2. The Freon leakage detection system based on the single-chip microcomputer according to claim 1, characterized in that: the slave system also comprises an alarm module, wherein the alarm module is connected with the ADC conversion module and is used for starting an alarm device when the gas detection module detects that the concentration of Freon around the sensor reaches an alarm threshold value.
3. The Freon leakage detection system based on the single-chip microcomputer according to claim 1, characterized in that: the gas sensor adopts an MQ137 gas sensor.
4. The Freon leakage detection system based on the single-chip microcomputer according to claim 1, characterized in that: host computer singlechip processing module adopts the USART serial ports mode, communication module adopts RS485 communication module, and host computer system and the application MODBUS agreement of following the computer system realize asynchronous communication.
5. The Freon leakage detection system based on the single-chip microcomputer according to claim 1, characterized in that: the processing module of the host single chip microcomputer adopts STM32F101CBT6 series ARM chips, pins PA9 and PA10 of the processing module of the host single chip microcomputer are set as synchronous transceivers to synchronously receive and transmit data with a human-computer interaction interface, and pins PB10 and PB11 of the processing module of the host single chip microcomputer are set as asynchronous transceivers to realize asynchronous communication with a slave system.
6. The Freon leakage detection system based on the single-chip microcomputer according to claim 1, characterized in that: the slave single-chip microcomputer processing module adopts an ATmega8-8AU chip, pins PD0 and PD1 of the ATmega8-8AU chip are set to be asynchronous transceivers to achieve asynchronous communication with a host system, the pin ADC7 receives signals conditioned by the gas detection module to achieve analog-to-digital conversion of analog signals, the pin PD5 achieves the function of signal output, and the slave single-chip microcomputer processing module can enable the pin PD5 to output high level.
7. The Freon leakage detection system based on the single-chip microcomputer according to claim 1, characterized in that: the human-computer interaction interface is communicated with the host single-chip microcomputer processing module in an RS232 serial port card mode and receives a user control instruction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920886887.7U CN210322872U (en) | 2019-06-13 | 2019-06-13 | Freon leakage detection system based on singlechip |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920886887.7U CN210322872U (en) | 2019-06-13 | 2019-06-13 | Freon leakage detection system based on singlechip |
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| Publication Number | Publication Date |
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| CN210322872U true CN210322872U (en) | 2020-04-14 |
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| CN201920886887.7U Expired - Fee Related CN210322872U (en) | 2019-06-13 | 2019-06-13 | Freon leakage detection system based on singlechip |
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Granted publication date: 20200414 |