CN2270251Y - Ionic smoke concentration meter - Google Patents
Ionic smoke concentration meter Download PDFInfo
- Publication number
- CN2270251Y CN2270251Y CN 96212563 CN96212563U CN2270251Y CN 2270251 Y CN2270251 Y CN 2270251Y CN 96212563 CN96212563 CN 96212563 CN 96212563 U CN96212563 U CN 96212563U CN 2270251 Y CN2270251 Y CN 2270251Y
- Authority
- CN
- China
- Prior art keywords
- electrode
- circuit board
- base
- resistance
- ionization chamber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Fire-Detection Mechanisms (AREA)
Abstract
The utility model belongs to a smoke concentration detector for fire alarm, which is composed of a base (1), a circuit board (4), an intermediate pole plate (5), a smoke cover (2), an insect preventing net (10), an ionization chamber, a shield cover (3), a field effect tube V1 and three extraction electrodes. The utility model not only can be used as an alarm sensor, but also can be used as a reference detecting tool to detect other smoke concentration detectors.
Description
The utility model belongs to the fire alarm technical field, relates to the smoke density pick-up unit.
Existing smoke density detecting device, for example the disclosed smoke density detector of Chinese patent application CN93104643.2 " ionization type smoke detector " and CN93108917.4 " sensitivity measuring apparatus that is used for fire detector " all has an ionization chamber that has radioactive source, its detection principle is a phenomenon of utilizing smog that ionization chamber resistance is raise, draw the electric signal of reflection smoke density by a field effect transistor, when smoke density surpasses predetermined value, automatically connect alarm switch, send alarm of fire.This detector can only send switching signal, can not provide the continuous signal of the linear change of reflection smoke density.Therefore it can not use as the survey sensor of smoke density.
The purpose of this utility model provides a kind of ionic formula smoke density meter that can continuously linear measurement smoke density, and it not only can be used for doing alarm sensor, and can be used as the benchmark measuring tool that detects other smoke density detectors and use.
The technical solution of the utility model is: a kind of ionic formula smoke density meter, comprise a base 1, be fixed on circuit board 4 and middle plate 5 on the base, a petticoat pipe that has the plume through hole 2 that combines with base, cover the fly net 10 of plume through hole, on middle plate, fixing by radioactive source 8, the ionization chamber that target 9 and electrode 11 are formed, a radome 3 is arranged between base 1 and middle plate 5, the field effect transistor V1 that on circuit board, has a grid G to be connected with the target 9 of ionization chamber, it is characterized in that, circuit board 4 has three extraction electrode A, B, C, electrode 11 meets extraction electrode A through negative pole-positive pole of diode V3, the source S of V1 meets extraction electrode C through resistance R 1 receiving electrode 11 and through resistance R 2, the drain D of V1 meets extraction electrode B through resistance R 3, radioactive source 8 directly is connected with electrode C, the negative pole of stabilivolt V2 is connected with electrode 11, its positive pole is connected with the drain D of V1, at extraction electrode A, capacitor C 1 is arranged between B, its anodal receiving electrode A, the span of each element is: R1:10～200K Ω; R2:1K Ω; R3:1～4K Ω; C135～47 μ F; V2:7～18V.
The utility model has the advantages that and to export and the linear electric signal of tested smoke density.Can be used as smoke detector when it inserts warning circuit uses.When connecting a digital voltmeter thereafter, get final product the concentration of continuous coverage cigarette.
Description of drawings.Fig. 1 is the front view of the utility model structure; Fig. 2 is its side view; Fig. 3 is its electrical schematic diagram.Further the utility model is described below in conjunction with accompanying drawing.
Referring to Fig. 1,2, this is a mechanical construction drawing of the present utility model.In base 1, fixing circuit board 4 and middle plate 5, three extraction electrodes 7 are arranged at the bottom of base, represent with A, B, C respectively, circuit board 4 is connected by screw 6 with middle plate 5, fixing the ionization chamber of forming by radioactive source 8, target 9 and electrode 11 on the middle plate, petticoat pipe 2 covers on the ionization chamber and with base and combines, and around the petticoat pipe plume through hole that has fly net is arranged, and smog enters ionization chamber by these holes.Radome 3 screened circuit plates are to prevent interference.A field effect transistor V1 is arranged on circuit board, its grid connects the target 9 of ionization chamber, electrode 11 meets extraction electrode A through negative pole-positive pole of diode V3, the source S of V1 meets extraction electrode C through resistance R 1 receiving electrode 11 and through resistance R 2, and the drain D of V1 meets extraction electrode B through resistance R 3, and radioactive source 8 directly is connected with electrode C, the negative pole of stabilivolt V2 is connected with electrode 11, its positive pole is connected with the drain D of V1, capacitor C 1 is arranged, its anodal receiving electrode A between extraction electrode A, B.Add 15～30 volts DC voltage during use between A, B two electrodes, when smokelessly entering ionization chamber, the voltage at electrode A, C two ends equals forward voltage drop and the VR1 sum (therefore no current on the resistance R 2 does not have pressure drop) of V3; When cigarette entered ionization chamber, the equivalent resistance of ionization chamber increased, and the value of field effect transistor Ugs is increased, and VR1 is increased, and promptly electrode A, C both end voltage increase.Therefore A, C terminal voltage have reflected the concentration of ionization chamber cigarette.In the circuit span of each element as mentioned above, the value of recommendation is R1:39K Ω; R2:1K Ω; R3:2.2K Ω; C1:47 μ F; The voltage stabilizing value of stabilivolt V2 is 16 volts.Voltage between A, B two electrodes is recommended to get 24 volts.
Structure that accompanying drawing provides and circuit are embodiment of the present utility model.
Claims (2)
1, a kind of ionic formula smoke density meter, comprise a base (1), be fixed on circuit board (4) and middle plate (5) on the base, a petticoat pipe that has the plume through hole (2) that combines with base, cover the fly net (10) of plume through hole, on middle plate, fixing by radioactive source (8), the ionization chamber that target (9) and electrode (11) are formed, between base (1) and middle plate (5), a radome (3) is arranged, the field effect transistor V1 that on circuit board, has a grid (G) to be connected with the target (9) of ionization chamber, it is characterized in that, circuit board (4) has three extraction electrode A, B, C, electrode (11) meets extraction electrode A through negative pole-positive pole of diode V3, the source electrode of V1 (S) meets extraction electrode C through resistance R 1 receiving electrode (11) and through resistance R 2, the drain electrode of V1 (D) meets extraction electrode B through resistance R 3, radioactive source (8) directly is connected with electrode C, the negative pole of stabilivolt V2 is connected with electrode (11), its positive pole is connected with the drain D of V1, at extraction electrode A, capacitor C 1 is arranged between B, its anodal receiving electrode A, the span of each element is:
R1：10～200KΩ；
R2：1KΩ；
R3：1～4KΩ；
C135～47μF；
V2：7～18V。
2, ionic formula smoke density meter according to claim 1 is characterized in that, the numerical value of Resistor-Capacitor Unit is on its circuit board: R1:39K Ω; R2:1K Ω; R3:2.2K Ω; C1:47 μ F; V2 voltage stabilizing value is 16 volts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96212563 CN2270251Y (en) | 1996-06-19 | 1996-06-19 | Ionic smoke concentration meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96212563 CN2270251Y (en) | 1996-06-19 | 1996-06-19 | Ionic smoke concentration meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2270251Y true CN2270251Y (en) | 1997-12-10 |
Family
ID=33895204
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96212563 Expired - Fee Related CN2270251Y (en) | 1996-06-19 | 1996-06-19 | Ionic smoke concentration meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2270251Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101294923B (en) * | 2008-05-29 | 2011-03-02 | 中国科学技术大学 | Capacitor type smoke detector |
| CN102257543A (en) * | 2008-12-19 | 2011-11-23 | 鞍点有限责任两合公司 | Method and device for the early detection of fires |
-
1996
- 1996-06-19 CN CN 96212563 patent/CN2270251Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101294923B (en) * | 2008-05-29 | 2011-03-02 | 中国科学技术大学 | Capacitor type smoke detector |
| CN102257543A (en) * | 2008-12-19 | 2011-11-23 | 鞍点有限责任两合公司 | Method and device for the early detection of fires |
| CN102257543B (en) * | 2008-12-19 | 2014-06-18 | 鞍点有限责任两合公司 | Method and device for the early detection of fires |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |