CN203982546U - A kind of suction-type coal gas leakage detection instrument - Google Patents
A kind of suction-type coal gas leakage detection instrument Download PDFInfo
- Publication number
- CN203982546U CN203982546U CN201420346616.XU CN201420346616U CN203982546U CN 203982546 U CN203982546 U CN 203982546U CN 201420346616 U CN201420346616 U CN 201420346616U CN 203982546 U CN203982546 U CN 203982546U
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- collecting cover
- circuit
- suction fan
- gas
- switch
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Abstract
A kind of suction-type coal gas leakage detection instrument, comprises housing and gas security, in case top, spherical crown shape collecting cover is installed, air entry is offered on top at collecting cover, suction fan is installed below air entry, gas security is installed below suction fan, in the bottom of collecting cover, sidewall sets out pore; The air entry of described collecting cover is processed into is with female circular hole, the air intake duct that is threaded at collecting cover place, and air intake duct is cone tubular structure; Described gas security is connected with leakage sound light alarming circuit, and the alarm leaking in sound light alarming circuit is arranged on enclosure interior; In enclosure interior, battery undervoltage warning circuit and stubble warning device circuit are separately installed; Voltage table, status indicator lamp, suction fan switch, ammeter switch and equipment master switch are installed in front at housing.The utlity model has volume small and exquisite, simple to operate, highly sensitive, detect effect precisely, manipulate the advantages such as easy.
Description
Technical field
The utility model relates to detection of electrons field, especially a kind of coal gas checkout equipment.
Background technology
As everyone knows, coal gas is China's present stage one of most important combustion gas resource.But coal gas belongs to high-risk combustion gas, once there is gas leak, very easily cause the casualty accidents such as fire, blast, gas poisoning.At present, existing various kinds of coal gas warning device in market.But existing gas alarm device adopts stationary mounting structure mostly, be not easy to specifying doubtful gas leakage point to detect and investigate.In addition, gas alarm device only have after gas concentration acquires a certain degree and just can report to the police, act on very micro-for slight leakage.
Summary of the invention
The utility model object be to provide a kind of manipulate easy, precision is high, complete function, suction-type coal gas leakage detection instrument that mounting means is many.
For achieving the above object, adopted following technical scheme: the utility model mainly comprises housing and gas security, described housing is cube hollow shell structure; In case top, spherical crown shape collecting cover is installed, is offered air entry on the top of collecting cover, suction fan is installed below air entry, gas security is installed below suction fan, in the bottom of collecting cover, sidewall sets out pore; The air entry of described collecting cover is processed into is with female circular hole, the air intake duct that is threaded at collecting cover place, and air intake duct is cone tubular structure; Described gas security is connected with leakage sound light alarming circuit, and the alarm leaking in sound light alarming circuit is arranged on enclosure interior; In enclosure interior, battery undervoltage warning circuit and stubble warning device circuit are separately installed, battery undervoltage warning circuit and stubble warning device circuit, leakage sound light alarming circuit connect to form detection alarm system; Voltage table, status indicator lamp, suction fan switch, ammeter switch and equipment master switch are installed in front at housing, and voltage table, status indicator lamp are connected with detection alarm system respectively.
The course of work is roughly as follows:
Can adopt hand-held mobile active detecting mode and fixed installation formula fixed point detection mode.When hand-held active detecting, start suction fan switch and ammeter switch, by suction fan, tested gas is sucked collecting cover from air intake duct, by gas security, the gas sucking is detected, then testing result is shown by voltage table and status indicator lamp and audible-visual annunciator.When fixed installation detects, can directly detect by gas security, once there is the situation that gas concentration exceeds standard, can report to the police by the alarm leaking in sound light alarming circuit.
Compared with prior art, the utlity model has following advantage:
1, volume is small and exquisite, simple to operate, and hand-holdable formula is initiatively carried out leakage detection inspection, also can fixedly mount and carry out conventional gas leakage warning;
2, adopt collecting cover gas storage structure, and utilize suction fan to suck and detect gas, improve detection sensitivity, detect effect accurate;
3, can carry out sound and light alarm to gas leak situation, and can show the order of severity of revealing, be convenient to people and observe.
Brief description of the drawings
Fig. 1 is structure diagram of the present utility model.
Fig. 2 is circuit theory diagrams of the present utility model.
Drawing reference numeral: 1-housing, 2-gas security, 3-collecting cover, 4-air entry, 5-suction fan, 6-venthole, 7-air intake duct, 8-voltage table, 9-status indicator lamp, 10-suction fan switch, 11-ammeter switch, 12-equipment master switch.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described further:
In structure diagram of the present utility model as shown in Figure 1, the utility model mainly comprises housing 1 and gas security 2, and described housing is cube hollow shell structure; In case top, spherical crown shape collecting cover 3 is installed, is offered air entry 4 on the top of collecting cover, suction fan 5 is installed below air entry, gas security is installed below suction fan, in the bottom of collecting cover, sidewall sets out pore 6; The air entry of described collecting cover is processed into is with female circular hole, the air intake duct 7 that is threaded at collecting cover place, and air intake duct is cone tubular structure; Described gas security is connected with leakage sound light alarming circuit, and the alarm leaking in sound light alarming circuit is arranged on enclosure interior; In enclosure interior, battery undervoltage warning circuit and stubble warning device circuit are separately installed, battery undervoltage warning circuit and stubble warning device circuit, leakage sound light alarming circuit connect to form detection alarm system; Voltage table 8, status indicator lamp 9, suction fan switch 10, ammeter switch 11 and equipment master switch 12 are installed in front at housing, and voltage table, status indicator lamp are connected with detection alarm system respectively.
Be described further below in conjunction with the circuit theory diagrams shown in Fig. 2.
1, battery undervoltage warning circuit, is made up of NE555 integrated circuit, is completed the input of detected voltage by the 2nd pin.When the 2 pin voltages that are input to NE555 are when normal (12.6V～11.1V), 3 pin of NE555 are low level, LED
1(green) lamp is bright.Be connected on the voltage stabilizing diode (6.2V) of NE555 the 5th pin, a benchmark comparative voltage is provided, the voltage providing as potentiometer W1 lower than set threshold values time (being equivalent to battery total voltage lower than 11.1V), NE555 set, i.e. 3 pin output high level, LED1 green light goes out, and LED2 red lamp flass completes battery undervoltage and reports to the police.
2, air-breathing motor and startup running circuit, what the fan of suction fan adopted is shaft flow structure, utilizes spherical crown shape cover body structure to form catchment effect.What motor was used is brush direct current motor, can realize speed governing.Utilize the charging effect of C3, can make motor obtain enough starting currents.
3, gas security, what described gas security used is MQ-K6 type inflammable gas detection probe, 30 ohm of the direct current resistances of heater strip, heating current 150mA～165mA.Originally the response time of product is less than 10 seconds, is less than 30 seconds release time.But adopted the effect of air-breathing collecting cover, its time index has had significantly and to reduce, the response time becomes and is less than 3～5 seconds, becomes release time and is less than 5～10 seconds.In air during without inflammable gas, be greater than 50k Ω through two interelectrode resistance of heating sensor probe at ordinary times.After being detected in the time having inflammable gas, the resistance between two electrodes can reduce rapidly, and the cumulative concentration of inflammable gas is higher, and resistance is less, and minimum can be reduced to 2k Ω.This just provides the possibility of classification from the variation range of 30k Ω～2k Ω for testing circuit.In gas security, between inner two electrodes, scribble metal oxide materials, while running into the inflammable gas such as carbon monoxide, methane, its resistance can reduce, in order to ensure the stability of the electrochemical reaction in sensing, the power supply of heater strip is had to stricter requirement, this instrument has adopted 7809 regulator blocks, the battery voltage stabilizing of 12 volts after 9 volts, then through dropping resistor supply with.
4, leak sound light alarming circuit, operational amplifier LM324 integrated circuit, it is made up of four operational amplifiers, is IC3-1, IC3-2, IC3-3, IC3-4, with four voltage comparators of external circuit composition.
(1) start delayed alarm circuit, in order to eliminate the false alarm of start, by the delay circuit that 3. in-phase input end has added R10, C4 to form of the IC3-1 of LM324.After powering up, start in the duration of charging, what be connected with C4 is that in-phase input end current potential is 3. lower than reverse input end current potential 2., thereby 1. its output terminal is low level, block on the one hand the noble potential of sensor electrode 3, it cannot be exported, meanwhile, this low level makes PNP triode BG1 conducting, has lighted green LED 3 and has represented now just at heating starting.
After half a minute, C4 capacitor charging completes, and the 3. terminal voltage of IC3～1 exceedes the voltage that 2. inverting input is gone up, and comparer upset is end output high level 1., and sensor blocks and is disengaged, and the initial characteristic phase finishes, and sensor can be started working.
(2) the alarming threshold value commissioning of leaking in and heavily leaking, internal resistance value R4=15k Ω, the R5=6k Ω of electrode, by the single-pole triple-throw (SPTT) K switch control being contained on circuit board, while connecting 15k Ω, adjust W5, make LED5 just bright, in being decided to be, fail to report police, while connecting 6k Ω, adjust W6, make LED6 just bright, be decided to be heavily and leak.
(3) effect of voltage table, voltage table
be 5 volts of D.C. voltmeters, 1 volt is slight gas leakage below, and 1 volt is moderate gas leakage, and>=2 volts is severe gas leakage.
Connect after air intake duct, can, by air intake duct front end to key position points such as gas cooker, flexible pipe, valve, pipeline, joint, gas meter master switchs, carry out portable leakage detection detection, the now swing of voltage table below 1 volt will be brought into play peculiar effect.
(4) type of alarm
1) slightly leak: under leakage detection mode of operation, voltage table has the slight swing below 1 volt.
2) moderate is leaked: under leakage detection mode of operation, voltage table has 1 volt of above moderate below 2 volts to swing, and simultaneously with red lamp flass, 7. holds output high level by IC3-2 voltage comparator, and LED5 is red glittering, and voiceless sound is reported to the police.
3) severe is leaked, under leakage detection mode of operation, voltage table has more than 2 volts severe to swing, simultaneously with red lamp flass, by 8. pin output high level of IC3-3 voltage comparator, LED6 red lamp flass, and export high level by 3 pin of IC4NE555, make the astable multivibrator hummer being formed by BG5, BG6 send interrupted chimes of doom.
(5) stubble warning device circuit, in the time that the heater strip of MQ-K6 sensor blows, can cause the whole leakage detecting instrument ability of losing the job.The 30 ohmically current potentials in Europe that are now connected on heater strip lower end become electronegative potential immediately and are added in the reverse input end of IC3-4
upper, the voltage comparator being made up of IC3-4 is overturn, its
end output high level, the conducting of BG2 triode, LED4 red lamp flass (voiceless sound), completes stubble warning device.
Concrete operation instruction:
(1) start: turn on the power switch battery " normally " green light.In about time period half a minute that just start powers up, due to the initial characteristic of sensor, the resistance between two electrodes can reduce rapidly, so that produce start false alarm phenomenon.In order to prevent false alarm, in the time of circuit design, add start delay circuit, make it, in the later half minutes of start, to have blocked warning function, at this moment there is " startup " green light to indicate to wait for.Cross " startup " green light after half a minute and go out, represent that duty is ready to.
(2) leak detection function test
Open air-breathing switch and ammeter switch, first check that voltage table pointer should get back to 0.4 volt, represent in air without inflammable gas.Check that again suction fan slowly runs.In the situation that air intake duct not being installed, put the lighter of a blowing-out at three centimeters of places of collecting cover entrance, after several seconds, can see that voltage table pointer starts deflection.In the time that indicator points to 1 volt, " middle leakage " warning red light is glittering, is continuing to provide source of the gas, and voltage table pointer is during to 2 volts, and " heavily leaking " red light is glittering, sends interrupted chimes of doom simultaneously.After lighter is turned off or removed, several seconds just can stop alarm.
(3) simulation pipeline gas leakage point test for leak, connects air intake duct, and the mouth of pipe is slowly moved near leak source.Observe voltage table, find that there is moment swing time, stop searching for forward, then move left and right suction pipe head, find indicator swing maximum, be leak source position.
(4) disposal that battery undervoltage is reported to the police, when the battery undervoltage warning red lamp flass, represents that cell voltage is low to about 11.1 volts, now needs to change battery.Open the lid, take off under-voltage battery, change the charged battery of lastblock, can work on.
Above-described embodiment is described preferred implementation of the present utility model; not scope of the present utility model is limited; do not departing under the prerequisite of the utility model design spirit; various distortion and improvement that those of ordinary skill in the art make the technical solution of the utility model, all should fall in the definite protection domain of the utility model claims.
Claims (1)
1. a suction-type coal gas leakage detection instrument, comprises housing and gas security, it is characterized in that: described housing is cube hollow shell structure; In case top, spherical crown shape collecting cover is installed, is offered air entry on the top of collecting cover, suction fan is installed below air entry, gas security is installed below suction fan, in the bottom of collecting cover, sidewall sets out pore; The air entry of described collecting cover is processed into is with female circular hole, the air intake duct that is threaded at collecting cover place, and air intake duct is cone tubular structure; Described gas security is connected with leakage sound light alarming circuit, and the alarm leaking in sound light alarming circuit is arranged on enclosure interior; In enclosure interior, battery undervoltage warning circuit and stubble warning device circuit are separately installed, battery undervoltage warning circuit and stubble warning device circuit, leakage sound light alarming circuit connect to form detection alarm system; Voltage table, status indicator lamp, suction fan switch, ammeter switch and equipment master switch are installed in front at housing, and voltage table, status indicator lamp are connected with detection alarm system respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420346616.XU CN203982546U (en) | 2014-06-26 | 2014-06-26 | A kind of suction-type coal gas leakage detection instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420346616.XU CN203982546U (en) | 2014-06-26 | 2014-06-26 | A kind of suction-type coal gas leakage detection instrument |
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| Publication Number | Publication Date |
|---|---|
| CN203982546U true CN203982546U (en) | 2014-12-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420346616.XU Expired - Fee Related CN203982546U (en) | 2014-06-26 | 2014-06-26 | A kind of suction-type coal gas leakage detection instrument |
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| CN (1) | CN203982546U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106205064A (en) * | 2016-08-29 | 2016-12-07 | 四川启昌管道工程有限责任公司 | A kind of natural gas leaking detection alarm device |
| CN106973533A (en) * | 2017-04-18 | 2017-07-21 | 南安市永腾技术咨询有限公司 | A kind of Intelligent gas monitoring device being easily installed based on Internet of Things |
-
2014
- 2014-06-26 CN CN201420346616.XU patent/CN203982546U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106205064A (en) * | 2016-08-29 | 2016-12-07 | 四川启昌管道工程有限责任公司 | A kind of natural gas leaking detection alarm device |
| CN106973533A (en) * | 2017-04-18 | 2017-07-21 | 南安市永腾技术咨询有限公司 | A kind of Intelligent gas monitoring device being easily installed based on Internet of Things |
| CN106973533B (en) * | 2017-04-18 | 2019-10-22 | 南京铭普电器有限公司 | A kind of Intelligent gas monitoring device being easily installed based on Internet of Things |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141203 Termination date: 20150626 |
|
| EXPY | Termination of patent right or utility model |