CN101713581A - Stored PH3 gas concentration monitoring device - Google Patents
Stored PH3 gas concentration monitoring device Download PDFInfo
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- CN101713581A CN101713581A CN200910230814A CN200910230814A CN101713581A CN 101713581 A CN101713581 A CN 101713581A CN 200910230814 A CN200910230814 A CN 200910230814A CN 200910230814 A CN200910230814 A CN 200910230814A CN 101713581 A CN101713581 A CN 101713581A
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- gas concentration
- sensor
- fan
- chip microcomputer
- power supply
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Abstract
The invention provides a stored PH3 gas concentration monitoring device, which comprises a gas concentration measurement device and a ventilation device, wherein the gas concentration measurement device comprises a singlechip, a PH3 sensor, a direct current regulated power supply and a plastic shell; the singlechip, the partial PH3 sensor and the direct current regulated power supply are all sealed in the plastic shell; the singlechip and the PH3 sensor are connected with the direct current regulated power supply; the PH3 sensor is connected with an A/D converter of the singlechip through a line; and the ventilation device comprises an intake fan and an exhaust fan, scavenging ports of which the opening/closing can be controlled are arranged in front of the intake fan and the exhaust fan, the inside of each of the intake fan and the exhaust fan is provided with a control circuit, and control motors of the scavenging ports of which the opening/closing can be controlled and the control circuits of the intake fan and the exhaust fan are all connected with the singlechip. The device monitors the PH3 concentration in the environment in real time through the singlechip and the PH3 sensor, improves the automation degree in insecticidal operation, and has strong real-time performance and safety.
Description
Technical field
The present invention relates to PH in a kind of storage
3The safety monitoring device of desinsection gas belongs to gas concentration monitoring technique field.
Background technology
Tobacco, grain etc. for preventing insect pest, regularly be taked the desinsection measure in storage process, current modal method is the PH that produces with phosphide
3The gas fumigant insect killing.Hydrogen phosphide is the gas of a kind of very easily spontaneous combustion and severe toxicity, may blast when concentration in the air surpasses 1200ppm.At present, PH
3The control mode of gas concentration is generally the staff and utilizes the phosphine concentration detecting instrument that the phosphine concentration in the warehouse is carried out regular collection, when in the warehouse during excessive concentration, pass through venting practice, the phosphine gas concentration that reduces, this mode labour intensity height, real-time is poor, and produces great potential safety hazard, and great restriction is arranged in application.
Summary of the invention
At existing storage PH
3The deficiency that the gas concentration monitor mode exists improves automaticity and security in the desinsection process, the invention provides a kind of automaticity height, can realize the storage PH that concentration monitor combines with concentration control
3Gas concentration monitoring device.
Storage PH of the present invention
3Gas concentration monitoring device is realized by following scheme:
This PH that stores in a warehouse
3Gas concentration monitoring device comprises gas concentration measuring apparatus and ventilation unit; Gas concentration measuring apparatus comprises single-chip microcomputer, PH
3Sensor, D.C. regulated power supply and plastic casing are except PH
3The probe of sensor exposes beyond the housing, single-chip microcomputer, PH
3Other parts of sensor and D.C. regulated power supply all are sealed in the plastic casing, single-chip microcomputer and PH
3Sensor all is connected with D.C. regulated power supply, PH
3Sensor links to each other with the A/D converter of single-chip microcomputer by circuit; Ventilation unit comprises an air intake fan and a ventilating fan, the front of air intake fan and ventilating fan all is provided with the scavenge port of controllable switch, be provided with control circuit in air intake fan and the ventilating fan, the control motor of the scavenge port of controllable switch and air intake are fanned and the control circuit of ventilating fan all is connected with single-chip microcomputer in the gas concentration measuring apparatus.
The scavenge port of described controllable switch comprises plastic plate, guide rail, internal thread bar, external thread rod and stepper motor, rubber seal is installed around the inboard of plastic plate, four jiaos of plastic plate are equipped with guide rail, the internal thread bar is fixed on the central authorities of plastic plate, and be connected with an end of external thread rod, the other end of external thread rod is connected with stepper motor.Stepper motor drives the external thread rod rotation, thereby plastic plate is seesawed.Configure the suitable rotation direction of stepper motor and rotate unlatching and the closure that the number of turns can realize passage.
Described ventilation fan is made of flabellum and motor, and motor and control circuit all within the plastic casing of ventilation fan, prevent the gas attack circuit.
The each several part of gas concentration measuring apparatus is sealed in the plastic casing, can prevent the PH3 gas attack Circuits System of deep-etching.Single-chip microcomputer is by the switch of control circuit control ventilation unit scavenge port and the operation of changing fan.PH
3The probe of sensor is gathered extraneous PH
3Concentration, and chemical signal changed into the A/D converter that electrical signal transfer is given single-chip microcomputer.Single-chip microcomputer is the control core of whole device, and single-chip microcomputer was got the data of an A/D converter collection every 20 seconds, be translated into concentration value (ppm), and compare with safety threshold values a.When greater than safety threshold values a, this moment monitoring of environmental PH
3Excessive concentration, the two-way I/O port by the single-chip microcomputer control exhaust outlet that transmits control signal is respectively opened, and ventilating fan is opened; The control signal of a two-way I/O port control air inlet is at a distance opened in addition, and the air intake fan is opened.This moment, single-chip microcomputer continued to get every 20 seconds the data that A/D converter is gathered, and when the concentration value that obtains during less than safety threshold values b (b＜a, safe threshold values b is set by user oneself), then closed two and overlapped the ventilation equipment.
The present invention passes through PH by single-chip microcomputer
3PH in the real-time monitoring of environmental of sensor
3Concentration when ambient concentration is too high, is controlled the PH in the ventilation equipment reduction warehouse automatically
3Concentration has improved automation degree in insecticidal operation, and real-time and high safety have very strong practical value.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is an operational flow diagram of the present invention.
Fig. 3 is the structural representation of the air inlet of controllable switch among the present invention.
Fig. 4 is the control circuit of ventilation fan among the present invention.
Fig. 5 is a Stepping Motor Control circuit among the present invention.
Among the figure: 1, single-chip microcomputer, 2, PH
3Sensor, 3, the scavenge port of controllable switch, 4, the scavenge port of controllable switch, 5, the air intake fan, 6, ventilating fan, 7, plastic plate, 8, guide rail, 9, the internal thread bar, 10, external thread rod, 11, stepper motor, 12, ventilation fan.
The specific embodiment
As shown in Figure 1, storage PH of the present invention
3Gas concentration monitoring device comprises gas concentration measuring apparatus and ventilation unit.Gas concentration measuring apparatus comprises single-chip microcomputer 1, PH
3Sensor 2, constant voltage dc source and plastic casing shell, single-chip microcomputer 1 and PH
3Sensor 2 all is connected with D.C. regulated power supply, PH
3Sensor 2 links to each other by the A/D converter of circuit with single-chip microcomputer 1.。Ventilation unit comprises two ventilation fans, and one is that 5, one on air intake fan is a ventilating fan 6, and the front of air intake fan 5 is provided with the air inlet 3 of controllable switch, and the front of ventilating fan 6 is provided with the exhaust outlet 4 of controllable switch.
As shown in Figure 3, ventilation unit is installed in the wall in warehouse, and the air inlet 3 of controllable switch and the exhaust outlet 4 of controllable switch comprise plastic plate 7, guide rail 8, internal thread bar 9, external thread rod 10 and stepper motor 11.Square plastic plate 7 is used to close scavenge port; Around the inboard of plastic plate 7 rubber seal is installed, when plastic plate 7 was closed scavenge port, rubber seal sealed; Four jiaos of plastic plate 7 are equipped with guide rail 8, and guide rail 8 stretches in the loose within the walls installing port, play fixed plastics plate 7, prevent to rotate when plastic plate 7 from moving forward and backward.Internal thread bar 9 is fixed on the central authorities of plastic plate 7, and is connected with an end of external thread rod 10.The other end of external thread rod 10 is connected with stepper motor 11.Stepper motor 11 drives external thread rod 10 rotations, thereby plastic plate 7 is seesawed.Configure the suitable rotation direction of stepper motor 11 and rotate unlatching and the closure that the number of turns can realize passage.Ventilation fan 12 is positioned at the back of stepper motor 11.
Single-chip microcomputer 1 adopts the product of the PIC18F4620 of Microchip company product, and it has 10 A/D converters of 13 tunnel inputs, 4 16 bit timing device/counters, and 48 two-way I/O mouths can satisfy the needs in the practical application fully.Wherein, ANO is PH
3The input of sensor 2.RC0 in the I/O mouth～3, RC4～7 are respectively the Stepping Motor Control output of air inlet and gas outlet, the switch of control scavenge port.RB0, RB1 are respectively the control output end of air intake fan 5 and ventilating fan 6.Other basic peripheral circuit of single-chip microcomputer 2 energy operate as normal is not repeated them here.
The control circuit of ventilation fan 12 as shown in Figure 4.Relay is driven by the S8050 triode, and RB0, the RB1 after single-chip microcomputer 1 initialization is low level, and the base stage of triode is pulled down to about zero volt, and triode ends, so relay is in off-state, and the ventilation fan no power; After single-chip microcomputer 1 control RB0, RB1 was high level ,+5 volts of power supplys made the triode conducting by resistance, and this moment, relay was in attracting state, ventilation fan energising operation.The diode of relay coil two ends parallel connected in reverse phase is to play the function that absorbs inverse electromotive force, protection corresponding driving triode.
The control circuit of stepper motor 11 as shown in Figure 5.RC0～3 of single-chip microcomputer (PIC4620) 1 drive stepper motor 11 by ULN2003.Characteristic by stepper motor 11 can get, RC0～3 are exported 1000,0100,0010,0001 pulse successively, this moment, stepper motor just changeed, turn over 4 θ (angle that θ turns over for each pulse enable signal stepper motor), so by these pulse signals of circulation output, can just turn over some circles by the control step motor, this moment, air-vent was opened; Otherwise RC0～3 identical several 0001,0010,0100,1000 the pulse signal of taking turns of output that circulates successively can realize that air-vent closes.The control mode of the pin of RC4～7 and RC0～3 are in full accord.
Because PH
3The particularity of gas, whole device of the present invention need carry out following specially treated:
(1) because PH
3The severe corrosive of gas, so internal circuit need be installed in the plastic casing, ventilating fan etc. are exposed to airborne parts and are plastics system.
(2) because PH
3The hypertoxic characteristic of gas and can be in air fast oxidative characteristic, ventilation unit needs by guide pipeline gas is discharged in the atmosphere on top, warehouse, makes its rapid diffusion and oxidation, prevents that poison gas from jeopardizing warehouse periphery personnel.
(3) because the PH that storage insecticidal adopts
3Gas generally is to produce by phosphide and water in air vapour generation chemical reaction, so when extraneous humidity ratio is big, need to add one deck airstrainer in the air inlet outside, adds drier in the screen pack, prevents to enter a large amount of malarias, thereby accelerates PH
3The generation speed of gas.
(4) PH
3The sensor collection point should prevent that distance is too near, the accuracy that influence is measured apart from the scavenge port larger distance.Air inlet and exhaust outlet also need to prevent to influence the ventilation quality apart from larger distance.
Operation of the present invention is undertaken by the program circuit in the single-chip microcomputer 1, and operational process as shown in Figure 2.
(1) gas concentration measuring apparatus is positioned over suitable measuring position, start-up system.Single-chip microcomputer 1 initialization, RB0, RB1, RC0～3, RC4～7 are output low level all.WatchDog Timer (WDT) is set, and pre-divider is chosen suitable frequency dividing ratio, makes its timing cycle be approximately 20S (the RC frequency of oscillation is 4MHZ in the example, so the selection timing cycle is 16.3S).
(2) start WatchDog Timer (WDT), single-chip microcomputer 1 dormancy when arriving the timing cycle 20S of WDT, produces and once overflows interruption, wakes single-chip microcomputer 1 up.Single-chip microcomputer 1 obtains PH by the AN0 pin
3The analog signal that sensor 2 is gathered is converted into data signal and calculates actual PH by self A/D module
3Concentration value.As the PH that gathers
3When concentration value surpasses safe threshold values a, this moment environmental PH
3Concentration value is too high, thus by RC0～3 and RC4～some pulse signals of taking turns of 7 forward circulation output, the some circles of control step motor 11 forward rotation, the realization scavenge port is opened, and puts pin RB0, RB1 then and transfers high level to, relay adhesive, ventilating fan operation.Afterwards, single-chip microcomputer 1 continues to gather environmental PH by above-mentioned steps
3Concentration value, when its value is reduced to safe threshold values b with interior (b＜a, safe threshold values b is set by user oneself), then according to above-mentioned opposite operation, put pin RB0, RB1 and transfer low level to, thereby close ventilation fan, then by RC0～3 and RC4～some pulse signals of taking turns of 7 recycled back output, the some circles of control step motor backward rotation, the realization scavenge port is closed.System repeats all operations before from new initialization.
Claims (3)
- One kind the storage PH 3Gas concentration monitoring device comprises gas concentration measuring apparatus and ventilation unit; It is characterized in that: gas concentration measuring apparatus comprises single-chip microcomputer, PH 3Sensor, D.C. regulated power supply and plastic casing are except PH 3The probe of sensor exposes beyond the housing, single-chip microcomputer, PH 3Other parts of sensor and D.C. regulated power supply all are sealed in the plastic casing, single-chip microcomputer and PH 3Sensor all is connected with D.C. regulated power supply, PH 3Sensor links to each other with the A/D converter of single-chip microcomputer by circuit; Ventilation unit comprises an air intake fan and a ventilating fan, the front of air intake fan and ventilating fan all is provided with the scavenge port of controllable switch, be provided with control circuit in air intake fan and the ventilating fan, the control motor of the scavenge port of controllable switch and air intake are fanned and the control circuit of ventilating fan all is connected with single-chip microcomputer in the gas concentration measuring apparatus.
- 2. storage PH according to claim 1 3Gas concentration monitoring device, it is characterized in that: the scavenge port of described controllable switch comprises plastic plate, guide rail, internal thread bar, external thread rod and stepper motor, rubber seal is installed around the inboard of plastic plate, four jiaos of plastic plate are equipped with guide rail, the internal thread bar is fixed on the central authorities of plastic plate, and be connected with an end of external thread rod, the other end of external thread rod is connected with stepper motor.
- 3. storage PH according to claim 1 3Gas concentration monitoring device is characterized in that: described ventilation fan is made of flabellum and motor, and motor and control circuit are all within the plastic casing of ventilation fan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102308143A CN101713581B (en) | 2009-11-25 | 2009-11-25 | Stored PH3 gas concentration monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102308143A CN101713581B (en) | 2009-11-25 | 2009-11-25 | Stored PH3 gas concentration monitoring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101713581A true CN101713581A (en) | 2010-05-26 |
| CN101713581B CN101713581B (en) | 2012-07-25 |
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ID=42417434
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009102308143A Expired - Fee Related CN101713581B (en) | 2009-11-25 | 2009-11-25 | Stored PH3 gas concentration monitoring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101713581B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102566654A (en) * | 2011-12-22 | 2012-07-11 | 上海夏普电器有限公司 | Mechanical monitoring device used in high-risk environment |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2775525Y (en) * | 2004-06-04 | 2006-04-26 | 朱培根 | Carbon monoxide concentration controller for inducing fan without air pipe for underground garage |
| JP4572767B2 (en) * | 2005-07-20 | 2010-11-04 | 富士電機システムズ株式会社 | Inspection method of gas sensor and gas leak alarm |
| CN2934582Y (en) * | 2006-08-03 | 2007-08-15 | 高天奇 | Coal mine methane detection and automatic fan control device |
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2009
- 2009-11-25 CN CN2009102308143A patent/CN101713581B/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102566654A (en) * | 2011-12-22 | 2012-07-11 | 上海夏普电器有限公司 | Mechanical monitoring device used in high-risk environment |
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| Publication number | Publication date |
|---|---|
| CN101713581B (en) | 2012-07-25 |
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| C14 | Grant of patent or utility model | ||
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Granted publication date: 20120725 Termination date: 20131125 |