CN213481656U - Air tightness tester for indoor gas pipeline - Google Patents
Air tightness tester for indoor gas pipeline Download PDFInfo
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- CN213481656U CN213481656U CN202022276441.8U CN202022276441U CN213481656U CN 213481656 U CN213481656 U CN 213481656U CN 202022276441 U CN202022276441 U CN 202022276441U CN 213481656 U CN213481656 U CN 213481656U
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Abstract
An indoor gas pipeline air tightness tester is a wireless remote transmission pressure recorder and comprises a sensor unit, a differential pressure amplifier circuit unit, a watchdog reset circuit unit, a main controller unit, an alarm unit, a key control unit, a liquid crystal display unit, a memory unit, a wireless communication module, a low voltage/overcurrent protection circuit unit, a power supply and a charging circuit unit; the structure is simple and easy to realize; the detected indoor gas pipeline air tightness data can be wirelessly transmitted by the SIM card in real time, so that the data can be conveniently archived; low cost, low power consumption and high stability.
Description
Technical Field
The utility model belongs to the technical field of the gas pipeline tightness detects correlation technique and specifically relates to an indoor gas pipeline tightness tester.
Background
The natural gas pipeline is directly communicated with the residents, great convenience is brought to the daily life of the residents, and whether the natural gas pipeline can safely, effectively and strictly operate or not is also placed in front of gas companies, construction units and residents. Natural gas is nontoxic, but after a human body inhales the natural gas, people can breathe difficultly and suffocate the natural gas under the condition that the people do not know, so that the tightness of the gas pipeline indoors directly influences the life safety of residents living in a room, and strict measures and means are adopted to detect the tightness of the gas pipeline so as to ensure the safe operation of the gas pipeline.
In the past, a U-shaped pressure gauge (water column meter) is adopted by a gas worker to check whether gas pipeline leakage occurs or not, firstly, workers blow gas to a pipeline nozzle, the pressure of a gas pipeline rises to above 5kPa to observe the U-shaped pressure gauge (water column meter) for 15 minutes, and see whether the liquid level in the U-shaped pressure gauge (water column meter) drops or not.
In addition, because the common electronic pressure gauge does not have a data storage function, the data cannot be analyzed before and after, whether leakage and other conditions are judged, and meanwhile, the portability is also the characteristic of the instrument, so that the difficulty of product development is high, and at present, no electronic product specially used for judging the pipeline sealing performance result exists at home and abroad.
In addition, the calibration matter temperature of the mercury barometer is 0 ℃, the sea level height with the latitude of 45 degrees is the standard, the numerical value directly read from the U-shaped barometer is not only corrected by instrument errors, but also corrected by temperature, latitude and sea level height in precise work, the correction process is complex, accurate pressure values are not easy to obtain, and the purity of mercury causes errors on the pressure measurement result; when a pipeline with higher pressure is measured, a mercury manometer is adopted, mercury belongs to toxic and volatile substances, and volatile mercury is easily atomized in the air and is inhaled into the lung to stimulate respiratory tract and symptoms of mercury poisoning. Mercury flows into the ground carelessly, which can cause great influence on soil and water source. Moreover, because manual recording is adopted, data archiving is inconvenient, and after a safety accident occurs, the responsibility of a related person in charge is difficult to follow.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an indoor gas pipeline gas tightness tester, it can compensate prior art's blank, and its simple structure, easy realization have certain practicality and development prospect.
The technical scheme of the utility model: an indoor gas pipeline air tightness tester comprises a shell, a pressing device and a detection circuit system in the shell, wherein the shell is provided with a display screen and a key, and the pressing device is installed in the shell; wherein the sensor unit is mounted on a sensor mounting plate; the input end of the main controller unit is respectively connected with the output ends of the watchdog reset circuit unit, the key control unit and the low-voltage/overcurrent protection circuit unit, and the output end of the main controller unit is connected with the alarm unit, the memory unit, the wireless communication module and the liquid crystal display unit; the main controller unit is in bidirectional data connection with the differential pressure amplifier circuit unit; the input end of the differential pressure amplifier circuit unit receives an output signal of the sensor unit, amplifies and converts the differential pressure signal into an analog-to-digital signal, and converts the signal into a digital signal which can be displayed and recorded; the input end of the low-power-consumption stabilized voltage supply is connected with the charging circuit unit, and the output end of the low-power-consumption stabilized voltage supply is connected with the low-voltage/overcurrent protection circuit unit; the key unit is effectively connected with a key on the shell; the pressing opening of the pressing device is arranged on the shell.
The main controller unit and the liquid crystal display unit both adopt SPI four-wire system data interfaces; the memory unit also employs an SPI interface.
The key control unit consists of a 6-bit key anti-shake circuit; the key control unit connects a switch with a pull-up resistor, then carries out Schmidt logic NOT gate circuit shaping through a counter CD40160 and then sends the shaped result to the main controller unit, and therefore the anti-interference performance of the key is improved; when no key is pressed, the main controller unit checks a high level, when the key is pressed, the main controller unit checks a low level, the low level is maintained for more than 50 milliseconds, and a valid key is confirmed.
The sensor unit is composed of one or two combinations of a pressure sensor and a temperature sensor.
The pressure sensor adopts an Mpx2010 series pressure sensor; the MPX2010Mpx2010 series sensor adopts a bridge circuit structure form, and the change of pressure can cause the change of bridge resistance to cause the unbalance of output differential pressure so as to form differential pressure; the temperature sensor is a PT100 series temperature sensor.
The differential pressure amplifier circuit unit is an SD16 differential pressure amplifier, adopts a two-stage operational amplifier circuit structure, and is connected in a conventional way.
The liquid crystal display unit consists of a liquid crystal driving module and a liquid crystal display screen; the liquid crystal driving module adopts a HT1621 low-power consumption section type liquid crystal driving chip and is used for receiving a control signal of the main controller unit and displaying the actual measurement data of the pressure sensor and the battery power on the liquid crystal display screen in real time; HT1621 low-power consumption segmentation liquid crystal driver chip has advantages such as low power dissipation, small, light in weight, ultra-thin, visual area is big, and the picture is effectual, resolution ratio is high, and the interference killing feature is strong.
The main controller unit adopts an MSP430F2418 singlechip as a core, adopts a low-voltage micro-power consumption circuit structure as a peripheral circuit, meets the requirement of battery power supply, and is in conventional connection.
The memory unit is composed of memory chips W25L256 and FM25L 256.
The wireless communication module is provided with a mobile phone card seat for inserting an SIM card to realize wireless remote transmission of pressure and temperature data; the wireless communication module is based on an NBIOT narrow-band Internet of things technology, achieves ultra-low power consumption and does not limit distance data transmission.
The low-voltage/overcurrent protection circuit unit consists of a low-voltage protection module, a fuse current-limiting module and an overcurrent protection module; the fuse current limiting module can prevent the reverse connection of the battery; the overcurrent protection module is in a circuit structure with a wireless copper whisker module BC95, and an on-hook power supply is adopted for overcurrent protection; the wireless copper whisker module BC95 and the main controller unit adopt serial asynchronous communication; the copper whisker baud rate of the wireless copper whisker module BC95 is 19200 bps.
The power supply is a 3.6V-2 AH rechargeable lithium battery, belongs to a low-power-consumption stabilized power supply, the power supply voltage is 3-4.2V, and when the voltage is lower than 3.7V, the liquid crystal display unit displays a symbol with low battery power and needs to charge the instrument in time; the power source may also be a 1.5V by 2 dry cell battery configuration.
The indoor gas pipeline air tightness tester is provided with a USB 5V charging interface, and can charge a power supply through the charging circuit unit.
The alarm unit adopts two modes of buzzer sounding and light-emitting diode indication; generally, the pressure is required to be kept for 15 minutes in the indoor tightness detection process, on the premise that no pressure drop occurs, after the air pump completes injection, the pressure recorder collects the pressure once every 5 seconds, if the pressure drop is larger than 4Pa, an alarm is started, the buzzer sends out a sound prompt of pressure testing failure, and after leakage to be detected, the pressure testing and density judgment process is restarted.
The utility model has the advantages that: the structure is simple and easy to realize; the detected indoor gas pipeline air tightness data can be wirelessly transmitted by the SIM card in real time, so that the data can be conveniently archived; low cost, low power consumption and high stability.
Drawings
Fig. 1 is a block diagram of the overall structure of the air tightness tester for the indoor gas pipeline of the present invention.
Fig. 2 is a schematic view of a housing of the indoor gas pipe air-tightness tester of the present invention.
FIG. 3-a and FIG. 3-b are schematic diagrams showing the installation of components in the detection circuit system of the air tightness tester for indoor gas pipeline according to the present invention (wherein FIG. 3-a is a front side, FIG. 3-b is a back side)
The mobile phone comprises a shell 1, a display screen 2, a key 3, a pressing port 4, a liquid crystal display unit 5, a memory unit 6, a sensor mounting plate 7, a differential pressure amplifier circuit unit 8, a key control unit 9, a main controller unit 10, a mobile phone card seat 11, a key flat cable plug 12, a wireless communication module 13, a mobile phone antenna seat 14, a pressure sensor 15 and a battery current-limiting protection module 16.
Detailed Description
Example (b): an indoor gas pipeline air tightness tester is shown in figure 1 and comprises a shell 1, a pressing device and a detection circuit system in the shell, wherein the shell 1 is provided with a display screen 2 and a key 3, and the pressing device is installed in the shell 1; wherein the sensor unit is mounted on a sensor mounting plate 7; the input end of the main controller unit 10 is respectively connected with the output ends of the watchdog reset circuit unit, the key control unit 9 and the low voltage/overcurrent protection circuit unit, and the output end thereof is connected with the alarm unit, the memory unit, the wireless communication module 13 and the liquid crystal display unit 5; the main controller unit 10 is in bidirectional data connection with the differential pressure amplifier circuit unit 8; the input end of the differential pressure amplifier circuit unit 8 receives the output signal of the sensor unit, amplifies and converts the differential pressure signal into an analog-to-digital signal, and converts the signal into a digital signal which can be displayed and recorded; the input end of the low-power-consumption stabilized voltage supply is connected with the charging circuit unit, and the output end of the low-power-consumption stabilized voltage supply is connected with the low-voltage/overcurrent protection circuit unit; the key unit 9 is effectively connected with the keys 3 on the shell 1; the pressing opening 4 of the pressing device is arranged on the shell 1, as shown in fig. 2.
The main controller unit 10, the liquid crystal display unit 5 and the memory unit 6 are connected by an SPI four-wire system data interface.
The key control unit 9 is composed of a 6-bit key anti-shake circuit and is provided with a key flat cable plug 12, as shown in figure 3-a, and is effectively connected with the keys 3 on the shell 1 by means of a key chip; the key control unit 9 connects the switch with the pull-up resistor, then carries out Schmidt logic NOT gate circuit shaping through the counter CD40160 and then sends the shaped result to the main controller unit 10, and the anti-interference performance of the key is improved; when there is no key, the main controller unit 10 checks a high level, and when the key is pressed, the main controller unit 10 checks a low level, and the low level is maintained for more than 50 ms, and a valid key is confirmed.
The sensor unit is composed of an Mpx2010 series pressure sensor 15 and a PT100 series temperature sensor; the MPX2010 series sensor is in the form of a bridge circuit structure, and a change in pressure will cause a change in bridge resistance to cause an imbalance in output differential pressure, thereby creating a differential pressure.
The differential pressure amplifier circuit unit 8 is an SD16 differential pressure amplifier, and adopts a two-stage operational amplifier circuit structure.
The liquid crystal display unit 5 is composed of a HT1621 low-power consumption segment type liquid crystal driving chip and a liquid crystal display screen, as shown in fig. 3; the liquid crystal driving chip is used for receiving a control signal of the main controller unit 10, displaying the measured data of the pressure sensor and the battery power on the liquid crystal display screen in real time, and has the advantages of low power consumption, small size, light weight, ultra-thin property, large visual area, good picture effect, high resolution, strong anti-interference capability and the like, as shown in fig. 3-a.
The main controller unit 10 adopts an MSP430F2418 singlechip as a core, and adopts a low-voltage micro-power consumption circuit structure as a peripheral circuit, so that the requirement of battery power supply is met, and the connection is conventional.
The memory unit 6 is composed of memory chips W25L256 and FM25L256, as shown in FIG. 3-a, and the connection is conventional.
The wireless communication module 13 is provided with a mobile phone card holder 11 and a mobile phone antenna holder 14, and is used for inserting an SIM card to realize wireless remote transmission of pressure and temperature data, as shown in fig. 3; the wireless communication module is an NBIOT communication module based on an NBIOT narrowband Internet of things technology, and as shown in fig. 3-b, ultra-low power consumption is achieved, and data transmission without distance limitation is achieved.
The low-voltage/overcurrent protection circuit unit is composed of a battery current-limiting protection module 16, a low-voltage protection module, a fuse current-limiting module and an overcurrent protection module; the fuse current limiting module can prevent the reverse connection of the battery; the overcurrent protection module is of a wireless copper whisker module BC95 circuit structure, and an on-hook power supply is adopted for overcurrent protection; the wireless copper whisker module BC95 and the main controller unit adopt serial asynchronous communication; the copper whisker baud rate of the wireless copper whisker module BC95 is 19200 bps.
The power supply is a 3.6V-2 AH rechargeable lithium battery, and belongs to a low-power-consumption stabilized voltage power supply, the power supply voltage is 3-4.2V, and when the voltage is lower than 3.7V, the liquid crystal display unit displays a symbol with low battery power and needs to charge the instrument in time.
The indoor gas pipeline air tightness tester is provided with a USB 5V charging interface, and can charge a power supply through the charging circuit unit.
The alarm unit adopts two modes of buzzer sounding and light-emitting diode indication; generally, the pressure is required to be kept for 15 minutes in the indoor tightness detection process, on the premise that no pressure drop occurs, after the air pump completes injection, the pressure recorder collects the pressure once every 5 seconds, if the pressure drop is larger than 4Pa, an alarm is started, the buzzer sends out a sound prompt of pressure testing failure, and after leakage to be detected, the pressure testing and density judgment process is restarted.
Claims (10)
1. An indoor gas pipeline air tightness tester comprises a shell, a pressing device and a detection circuit system in the shell, wherein the shell is provided with a display screen and a key, and the pressing device is installed in the shell; wherein the sensor unit is mounted on a sensor mounting plate; the input end of the main controller unit is respectively connected with the output ends of the watchdog reset circuit unit, the key control unit and the low-voltage/overcurrent protection circuit unit, and the output end of the main controller unit is connected with the alarm unit, the memory unit, the wireless communication module and the liquid crystal display unit; the main controller unit is in bidirectional data connection with the differential pressure amplifier circuit unit; the input end of the differential pressure amplifier circuit unit receives an output signal of the sensor unit, amplifies and converts the differential pressure signal into an analog-to-digital signal, and converts the signal into a digital signal which can be displayed and recorded; the input end of the low-power-consumption stabilized voltage supply is connected with the charging circuit unit, and the output end of the low-power-consumption stabilized voltage supply is connected with the low-voltage/overcurrent protection circuit unit; the key unit is effectively connected with a key on the shell; the pressing opening of the pressing device is arranged on the shell.
2. The indoor gas pipeline airtightness tester according to claim 1, wherein said main controller unit and said liquid crystal display unit both employ SPI four-wire system data interfaces; the memory unit also adopts an SPI interface; the alarm unit adopts two modes of buzzer sounding and light-emitting diode indication; the key control unit is composed of a 6-bit key anti-shake circuit.
3. The indoor gas pipeline airtightness tester according to claim 1, wherein said sensor unit is composed of one or a combination of two of a pressure sensor and a temperature sensor.
4. The indoor gas pipeline airtightness tester according to claim 3, wherein said pressure sensor is an Mpx2010 series pressure sensor; the MPX2010Mpx2010 series sensor adopts a bridge circuit structure form; the temperature sensor is a PT100 series temperature sensor.
5. The indoor gas pipeline airtightness tester according to claim 1, wherein said differential pressure amplifier circuit unit is an SD16 differential pressure amplifier, and a two-stage operational amplifier circuit structure is adopted.
6. The indoor gas pipeline airtightness tester according to claim 1, wherein said liquid crystal display unit is constituted by a liquid crystal driving module and a liquid crystal display screen; the liquid crystal driving module adopts a HT1621 low-power consumption segment type liquid crystal driving chip; the main controller unit adopts an MSP430F2418 singlechip as a core and takes a low-voltage micro-power consumption circuit structure as a peripheral circuit; the memory unit is composed of memory chips W25L256 and FM25L 256.
7. The indoor gas pipeline airtightness tester according to claim 1, wherein the wireless communication module is provided with a mobile phone card holder for inserting an SIM card to realize wireless remote transmission of pressure and temperature data.
8. The indoor gas pipeline airtightness tester according to claim 1, wherein said low voltage/overcurrent protection circuit unit is composed of a low voltage protection module, a fuse current limiting module and an overcurrent protection module; the fuse current limiting module can prevent the reverse connection of the battery; the overcurrent protection module is of a wireless copper whisker module BC95 circuit structure, and an on-hook power supply is adopted for overcurrent protection; the wireless copper whisker module BC95 and the main controller unit adopt serial asynchronous communication; the copper whisker baud rate of the wireless copper whisker module BC95 is 19200 bps.
9. The indoor gas pipeline airtightness tester according to claim 1, wherein said power supply is a 3.6V x 2AH rechargeable lithium battery or a 1.5V x2 dry cell configuration.
10. The indoor gas pipeline airtightness tester according to claim 1, wherein the indoor gas pipeline airtightness tester is provided with a USB 5V charging interface, and can be charged with a power supply through a charging circuit unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022276441.8U CN213481656U (en) | 2020-10-14 | 2020-10-14 | Air tightness tester for indoor gas pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022276441.8U CN213481656U (en) | 2020-10-14 | 2020-10-14 | Air tightness tester for indoor gas pipeline |
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| Publication Number | Publication Date |
|---|---|
| CN213481656U true CN213481656U (en) | 2021-06-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022276441.8U Active CN213481656U (en) | 2020-10-14 | 2020-10-14 | Air tightness tester for indoor gas pipeline |
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| CN (1) | CN213481656U (en) |
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