CN2831098Y - Particle meter type smoke detector - Google Patents
Particle meter type smoke detector Download PDFInfo
- Publication number
- CN2831098Y CN2831098Y CN 200520092733 CN200520092733U CN2831098Y CN 2831098 Y CN2831098 Y CN 2831098Y CN 200520092733 CN200520092733 CN 200520092733 CN 200520092733 U CN200520092733 U CN 200520092733U CN 2831098 Y CN2831098 Y CN 2831098Y
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- smoke detector
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Abstract
The utility model relates to a particle meter type smoke detecting device, which comprises a laser, a laser beam space correction lens, a laser beam space filtering pipe, a detecting chamber, a laser bracket, a smoke detecting lens assembly, a bracket assembly of the smoke detector, a smoke scattering detector, a malfunction detecting luminotron of the smoke detector, a light conducting hole and a reflecting board. The design of the dark background of the smoke particle counting detection and the designs of minimal scattering active region and minimal detection viewing field of the single particle scattering pulse counting detection are realized by the utility model, and the structure requirements which are lifted by single smoke particle pulse scattering signals with higher sensitivity are ensured by the utility model. Various smoke detectors can be had more uniform response property by a sidewise scattering smoke detection design; the beam is not occur any reflex actions with the inner cavity of the detecting chamber, and the viewing field of the smoke detector is designed and limited in a minimal particle scattering field, so the effect of the pollution produced by the detecting chamber long running on the smoke particle counting detection is avoided.
Description
Technical field
The utility model belongs to the fire detecting and alarm technical field, can also be applied in the clean technology field, particularly a kind of particle counter type smoke detector.
Background technology
Along with China's development of economic construction, some play the special place of most important effect in national economy and social life, as computing center, picture and text archives information center, post and telecommunications hinge, integrated circuit workshop, nuclear power station, large-scale modernized dispatching control center, intelligent building control center, modern medical service mechanism etc., the security against fire demand is urgent day by day.Since its inner various electrical equipment high concentration and long-term work operation, thus there is more fire hidden danger, in case breaking out of fire will cause great economic loss to country, bring significant impact to society.In view of the importance and the singularity in these places, the super early fire detection warning problem in these places has become one of emphasis of security against fire, causes people's very big concern.
At present, the smoke detector of the general type of these place widespread uses, owing to be subjected to the not restriction of high factor of detection sensitivity, utmost point early detection scarce capacity for fire, basically the affirmation that belongs to fire is surveyed, be difficult to play the forecast and the fire prevention effect of fire, can not satisfy the requirement that the super early detection of fire is reported to the police.In order to improve the fire forecast pre-alerting ability of fire detector, developed attraction type high sensitivity smoke detection technology in the world.Offshore companies such as present Australian VISION company, Britain AIRSENSE company all adopt the high sensitivity smoke detection technology of smog group scattering, carry out smoke detection and warning by the light scattering signal of surveying a plurality of smoke particles, it can identify the potential condition of a fire at the fire commitment, the alarm of realization fire, this helps in time to take measures, prevent fire in possible trouble, thereby economic loss is minimized.
The utility model content
At the deficiency of the existing fire forecast in special place, prevention technique, in order to improve the sensitivity that smoke is surveyed, the utility model provides a kind of particle counter type smoke detector.Similar with other attraction type high sensitivity smoke detection devices, the utility model device also adopts smog light scattering detection principle to carry out smoke detection.Different with other devices is that the utility model device has adopted the smoke particle counting technology, can catch the light scattering signal of each smoke particle, by processing and counting to each light scattering pulse, come the concentration of smog in the probe gas sample, realize the hypersensitivity smoke detection.The semiconductor laser of middle power has been adopted in the design of the utility model device for this reason, has designed special light beam space constraint assembly, unique detection cell structure and delustring device, makes sensing chamber form extremely dark background; Design unique high-performance optical electrical signal conversion circuit and signal processing circuit, realized the particle counting smoke detection; This device has also designed smog photodetector fault detect LED and control circuit thereof, with the working condition of monitor smoke photodetector.This device detection sensitivity is high, can effectively detect the suspended particles of trace in the air, and the enough strong pulse counting signal of output, so this device also can be used for the detection of air purity.
The utility model device comprises laser instrument, laser beam space correcting lens, light beam spatial filtering pipe, detecting chamber, laser stent, smoke detection lens subassembly, smoke detector carriage assembly, smog scattering detector, smoke detector fault detect luminotron, light-conductive hole, reflecting plate, wherein the smoke detection lens subassembly comprises object lens, object lens threaded pressure ring, external thread lens tube and the outer retaining ring of pipe, and the smoke detector carriage assembly comprises bracket, bottom bracket, eyepiece, ocular thread pressure ring.
Wherein, laser stent and detecting chamber are fixed as one; Laser instrument and laser beam space correcting lens are integral by being threaded, and laser instrument on laser stent, and can be finely tuned the position of laser instrument by the degree of tightness that 4 screws screw in by 4 screw retention up and down; Detecting chamber embeds a light beam spatial filtering pipe near a side of laser beam space correcting lens, the position of opposite side and light beam spatial filtering pipe symmetry is provided with light-conductive hole, and wherein the center of laser instrument, laser beam space correcting lens, light beam spatial filtering pipe and light-conductive hole is positioned on the beam axis simultaneously; Front at light-conductive hole is provided with reflecting plate, and the angle of reflecting plate and detecting chamber optical axis is 135 °; Upper wall at detecting chamber is provided with threaded mounting hole, installation can pass in and out the smoke detection lens subassembly of bidirectional modulation in the hole, this assembly is made up of object lens, object lens threaded pressure ring, external thread lens tube and the outer retaining ring of pipe, object lens are installed in external thread lens tube interior forward end, compress by the object lens threaded pressure ring, smoke detection lens subassembly assembling back is installed in the mounting hole of surveying on the locular wall by screw thread, by retaining ring smoke detection lens subassembly and detecting chamber is locked; The bottom bracket of smoke detector carriage assembly is coaxial with the smoke detection lens subassembly, and is installed on the detecting chamber by screw, and bracket is fitted in the lens barrel top of bracket by the eyepiece pressure ring by eyepiece; The smog scattering detector is installed in the bracket, and bracket is connected by screw with bottom bracket, and closes with the coaxial cunning of smoke detection lens subassembly; The smog scattering detector be used to accept with beam axis to the smog scattered light that is 90 °; Be provided with the mounting hole of smoke detector fault detect luminotron below smoke detection lens subassembly mounting hole on the detection locular wall, smoke detector fault detect luminotron embeds in this hole, and compresses with threaded pressure ring.
The superiority of this structure has been to realize utmost point dark background design that the smoke particle counting surveys, minimum scattering process district that single particle scattering pulse counting is surveyed and the design of minimum detection viewing field, has guaranteed the topology requirement that the single smoke particle pulse scattered signal of high sensitivity is mentioned; Sidewise scattered smoke detection design makes that various smoke detectors are had comparatively balanced response performance; And because any reflex does not take place for light beam and detecting chamber inner chamber, and the visual field of smoke detector is designed to be limited in minimum particle scattering district, the influence that the pollution when avoiding the detecting chamber long-time running is surveyed the smoke particle counting.
Circuit signal conversion and annexation:
The circuit of this device comprises smoke detector bias voltage auto thermal compensation servo circuit module, this circuit module comprises voltage reference circuit, high pressure feedback adjusting circuit, high-voltage power output circuit, hv filtering mu balanced circuit, high pressure and power input terminal, and the smoke detector that is adopted in the utility model is the avalanche photodetector APD of inner band thermometric diode; High-voltage power supply is all circuit supplies by high pressure and power input terminal, wherein provides after the spike interference of the power supply of plateau power output circuit and high pressure feedback adjusting circuit by hv filtering mu balanced circuit filtering high pressure; The signal of the thermometric diode output of voltage reference circuit and smoke detector inside is input to high pressure feedback adjusting circuit jointly, regulation and high-pressure work point is set, and, be applied on the smoke detector last smoke detector output pulse signal by the high-voltage power output circuit.
The superiority of this circuit is to adopt the mode of the bias voltage adjustment that cost is extremely low, power consumption is minimum to solve the application technology key of avalanche photodetector sensitivity temperature drift, drawback such as price height, the power consumption of having avoided common employing cooling assembly to bring is big, volume is big; Bias voltage can be along with the two-way automatic adjustment of rising and descend of APD detector environment variation of temperature; It is simple and convenient that circuit is provided with adjusting, can adjustment be set according to the concrete running parameter of each APD detector, adapted to the discrete big actual demand of APD detector controlled variable.
Description of drawings
Fig. 1 is the utility model device schematic top plan view;
Fig. 2 is that the A-A of Fig. 1 is to sectional view;
Fig. 3 is smoke detection lens subassembly and smoke detector carriage assembly bottom bracket sectional view;
Fig. 4 is a smoke detector carriage assembly bracket sectional view
Fig. 5 smoke detector bias voltage auto thermal compensation servo circuit theory diagram;
Fig. 6 is a smoke detector bias voltage auto thermal compensation servo circuit schematic diagram;
Wherein, 1 laser instrument, 2 laser beam space correcting lenses, 3 light beam spatial filtering pipes, 4 detecting chambers, 5 laser stents, 6 smoke detection lens subassemblies, 6A object lens, 6B object lens threaded pressure ring, 6C external thread lens tube, 6D retaining ring, 7 smoke detector carriage assemblies, 7A bracket, 7B bottom bracket, 7C eyepiece, 7D ocular thread pressure ring, A smog scattering detector, B smoke detector fault detect luminotron, C light-conductive hole, D reflecting plate.
Embodiment
Shown in Fig. 1-4, the utility model device comprises laser instrument 1, laser beam space correcting lens 2, light beam spatial filtering pipe 3, detecting chamber 4, laser stent 5, smoke detection lens subassembly 6, smoke detector carriage assembly 7, smog scattering detector A, smoke detector fault detect luminotron B, light-conductive hole C, reflecting plate D, wherein smoke detection lens subassembly 6 comprises object lens 6A, object lens threaded pressure ring 6B, external thread lens tube 6C and the outer retaining ring 6D of pipe, and smoke detector carriage assembly 7 comprises bracket 7A, bottom bracket 7B, eyepiece 7C, ocular thread pressure ring 7D.
Wherein, laser stent 5 is fixed as one with detecting chamber 4; Laser instrument 1 and laser beam space correcting lens 2 are integral by being threaded, and laser instrument 1 on laser stent 5, and can be finely tuned the position of laser instrument 1 by the degree of tightness that 4 screws screw in by 4 screw retention up and down; Detecting chamber 4 embeds a light beam spatial filtering pipe 3 near a side of laser beam space correcting lens 2, the position of opposite side and light beam spatial filtering pipe 3 symmetries is provided with light-conductive hole C, and wherein the center of laser instrument 1, laser beam space correcting lens 2, light beam spatial filtering pipe 3 and light-conductive hole C is positioned on the beam axis simultaneously; Be provided with reflecting plate D in the front of light-conductive hole C, the angle of reflecting plate D and detecting chamber optical axis is 135 °; Upper wall at detecting chamber 4 is provided with threaded mounting hole, installation can pass in and out the smoke detection lens subassembly 6 of bidirectional modulation in the hole, this assembly is made up of object lens 6A, object lens threaded pressure ring 6B, external thread lens tube 6C and the outer retaining ring 6D of pipe, object lens 6A is installed in external thread lens tube 6C interior forward end, 6B compresses by the object lens threaded pressure ring, smoke detection lens subassembly 6 assembling back is installed in mounting hole on detecting chamber 4 walls by screw thread, by retaining ring 6D with smoke detection lens subassembly 6 and detecting chamber 4 lockings; The bottom bracket 7B of smoke detector carriage assembly 7 is coaxial with smoke detection lens subassembly 6, and is installed on the detecting chamber 4 by screw, and bracket 7A is fitted in the lens barrel top of bracket 7A by eyepiece pressure ring 7 by eyepiece 7C; Smog scattering detector A is installed in the bracket 7A, and bracket 7A is connected by screw with bottom bracket 7B, and closes with smoke detection lens subassembly 6 coaxial cunnings; Smog scattering detector A be used to accept with beam axis to the smog scattered light that is 90 °; Be provided with the mounting hole of smoke detector fault detect luminotron C below smoke detection lens subassembly 6 mounting holes on detecting chamber 4 walls, smoke detector fault detect luminotron C embeds in this hole, and compresses with threaded pressure ring.
In conjunction with Fig. 5, Fig. 6, the specific descriptions of this device circuit are as follows:
The smog scattering detector employing of this device is highly sensitive, the avalanche photodetector APD of high-gain, its detection sensitivity is 100 times of common PIN photodetector, just can excite avalanche effect and obtain high sensitivity but need instead increase bias voltage, and the temperature coefficient of its permanent responsiveness bias voltage is+2V ℃.In order to guarantee that avalanche photodetector has constant detection sensitivity, general method is to adopt detector thermostatic control and constant voltage bias mode; The detector thermostatic control needs the constant temperature enclosure and the thermostatic control servo circuit of thermostat, thermal insulation design, volume is big, power consumption is big, complex structure, and the integrated avalanche photodetector of temperature control only has a number of companies of the Japan and the U.S. to provide, and costs an arm and a leg, and belongs to the control of export technical products, availability is poor, is not suitable for the use of this sniffer; Utilize the temperature characterisitic of the permanent responsiveness bias voltage of avalanche photodetector for this this device, designed wide cut bias voltage auto thermal compensation voluntarily and adjusted servo circuit, this circuit module comprises APD smoke detector, voltage reference circuit, high pressure feedback adjusting circuit, high-voltage power output circuit, hv filtering mu balanced circuit, high pressure and the power input terminal of an inner band thermometric diode; High-voltage power supply is all circuit supplies by high pressure and power input terminal, wherein provides after the spike interference of the power supply of plateau power output circuit and high pressure feedback adjusting circuit by hv filtering mu balanced circuit filtering high pressure; The signal of the thermometric diode output of voltage reference circuit and APD inside is input to high pressure feedback adjusting circuit jointly, regulation and high-pressure work point is set, and by the high-voltage power output circuit, is applied on the APD, last smoke detector output pulse signal.This circuit can be at-10 ℃---in+55 ℃ the scope, realize that the average voltage bias regulation is+2V/ ℃, the regulation deviation is less than ± 5%, bias voltage thermal tuning scope is+140V---+425V, solve the application difficult problem of avalanche photodetector sensitivity drift with low-cost and succinct mode, satisfied the requirement of this Design of device.Smoke detector is welded on the circuit board of smoke detector bias voltage servo circuit module, this circuit module be externally connected to ± 8V, ground wire and high pressure input+450V, ground wire, exporting has detectable signal line and signal ground.
Positive and negative ± 8V power supply design that this circuit adopts, high pressure input+450V is being lower than room temperature and the demand that is higher than bidirectional modulation in room temperature (10 ℃---+55 ℃) scope to guarantee smoke detector optimal bias working point.The high pressure input offers other circuit parts by the high-pressure filter circuit that is made of capacitor C 1 (103/2KV), capacitor C 2 (103/2KV) and coil I1 (ferrite bead).Wherein capacitor C 1, C2 are attempted by between high pressure+450V and the circuit ground, two-wire and around two passages of coil I1 be serially connected in respectively+450V passage and circuit ground passage on.
A unit U3B by resistance R 7 (10K), R10 (10K), R11 (5.6K), capacitor C 10 (104), electrochemical capacitor E4 (10u/16V) and integrated stable voltage circuit Z1 (LM385-2.5/LM285-2.5 or other devices that can replace) and amplifier U3 (other devices that can replace such as LM358/LM258) constitutes the adjustable voltage reference circuit jointly, different with general circuit is with respect to circuit ground, this voltage reference is the adjustable negative voltage benchmark, and the output tuning range is 0V----2.5V; Smoke detector APD adopts SPD-052 (C30919E/C30724P or other models that can replace) type, a built-in thermometric silicon diode, the temperature coefficient that utilizes diode PN joint forward voltage drop is-2mV/ ℃ characteristic, come the temperature of perception detector, this diode-built-in is with after capacitor C 6 (103) and electrochemical capacitor E3* (10u/16V) are in parallel, resistance in series R6 (36K), and be connected across circuit ground and-the 8V power supply between, common formation temperature measurement circuit, different with general circuit is with respect to circuit ground, this thermometric voltage is negative voltage signal, exports tuning range to be-0.4V----0.7V; The design that temperature measurement signal and voltage reference signal are negative signal is to guarantee the changed polarity of temperature measurement signal and incur loss through delay the key that the detector optimal bias is consistent with variation of temperature polarity.
Temperature measurement signal is connected the in-phase input end of another unit U3A of amplifier U3, voltage reference signal is by series connection adjustable resistance VR2 (10K), resistance R 5 (12K) is connected the reverse input end of U3A, this reverse input end is by series resistor R1 (20M), high voltage stabilizing pipe WY1 (MR2/125V) and high pressure NPN type triode N1 (C2752), the output terminal 1 of resistance R 4 (39K) and U3A links to each other and constitutes negative feedback loop, and be connected high pressure at test point VH place with resistance R 3 (430K) by serial connection adjustable resistance VR1 (1M) and import, the base stage of its mesohigh NPN type triode N1 connects power supply ground, resistance R 1 can and meet a filter capacitor C3 (102/630V, can take the circumstances into consideration to choose or do not select), this circuit design is different from conventional feedback amplifier design, can make the voltage at test point VH place be higher than the limiting voltage that amplifier allows far away, and guarantee that this point voltage can rise with the rising of temperature, descend with decrease of temperature, reach the order point of automatic Regulation.The pressure regulation multiplying power is set by VR2, the benchmark multiplying power is 1000, reference voltage working point when setting room temperature by adjustable resistance VR3, and this operating voltage is by the parameter decision of APD1, regulate the working point that amplifier U3A exports by resistance VR1, guarantee that the dynamic range of high-pressure tuner can reach+140V---+425V.
By triode N2 (C3632); N3 (C3632) and diode D1 (R2000) constitute shielded expansion stream darlington structure; and the base stage of triode N2 is connected at test point VH place with high pressure feedback adjusting circuit; triode N2; the base stage of N3 is respectively by high-voltage filtering capacitor C4 (103/630V); C5 (103/630V) is connected with circuit ground; the emitter output of triode N3 is passed through by resistance R 11 (100K); the П mode filter that capacitor C 11 (103/630V) and capacitor C 21 (103/630V) constitute is applied on 4 pin of smoke detector APD1, and above device constitutes the high-voltage power output circuit.Smoke particle direct impulse signal outputs to outside amplifying circuit by 1 pin of APD1.
The working power end of U3 and APD1 is provided with RC filtering link in this circuit, and its parameter can take the circumstances into consideration to choose, and its principle repeats no more.
Claims (3)
1, a kind of particle counter type smoke detector, comprise laser instrument, the laser beam space correcting lens, light beam spatial filtering pipe, detecting chamber, laser stent, the smoke detection lens subassembly, the smoke detector carriage assembly, the smog scattering detector, smoke detector fault detect luminotron, light-conductive hole, reflecting plate, wherein, the smoke detection lens subassembly comprises object lens, the object lens threaded pressure ring, external thread lens tube and the outer retaining ring of pipe, the smoke detector carriage assembly comprises bracket, bottom bracket, eyepiece, the ocular thread pressure ring is characterized in that laser stent and detecting chamber are fixed as one; Laser instrument and laser beam space correcting lens are integral by being threaded, and laser instrument on laser stent, and can be finely tuned the position of laser instrument by the degree of tightness that 4 screws screw in by 4 screw retention up and down; Detecting chamber embeds a light beam spatial filtering pipe near a side of laser beam space correcting lens, the position of opposite side and light beam spatial filtering pipe symmetry is provided with light-conductive hole, and wherein the center of laser instrument, laser beam space correcting lens, light beam spatial filtering pipe and light-conductive hole is positioned on the beam axis simultaneously; Front at light-conductive hole is provided with reflecting plate, and the angle of reflecting plate and detecting chamber optical axis is 135 °; Upper wall at detecting chamber is provided with threaded mounting hole, installation can pass in and out the smoke detection lens subassembly of bidirectional modulation in the hole, this assembly is made up of object lens, object lens threaded pressure ring, external thread lens tube and the outer retaining ring of pipe, object lens are installed in external thread lens tube interior forward end, compress by the object lens threaded pressure ring, smoke detection lens subassembly assembling back is installed in the mounting hole of surveying on the locular wall by screw thread, by retaining ring smoke detection lens subassembly and detecting chamber is locked; The bottom bracket of smoke detector carriage assembly is coaxial with the smoke detection lens subassembly, and is installed on the detecting chamber by screw, and bracket is fitted in the lens barrel top of bracket by the eyepiece pressure ring by eyepiece; The smog scattering detector is installed in the bracket, and bracket is connected by screw with bottom bracket, and closes with the coaxial cunning of smoke detection lens subassembly; The smog scattering detector be used to accept with beam axis to the smog scattered light that is 90 °; Be provided with the mounting hole of smoke detector fault detect luminotron below smoke detection lens subassembly mounting hole on the detection locular wall, smoke detector fault detect luminotron embeds in this hole, and compresses with threaded pressure ring;
Described smog scattering detector is realized control by smoke detector bias voltage auto thermal compensation servo circuit.
2, a kind of particle counter type smoke detector as claimed in claim 1, it is characterized in that smoke detector bias voltage auto thermal compensation servo circuit comprises smoke detector, voltage reference circuit, high pressure feedback adjusting circuit, high-voltage power output circuit, hv filtering mu balanced circuit, high pressure and power input terminal, high-voltage power supply is all circuit supplies by high pressure and power input terminal, wherein provides after the spike interference of the power supply of plateau power output circuit and high pressure feedback adjusting circuit by hv filtering mu balanced circuit filtering high pressure; The signal of the thermometric diode output of voltage reference circuit and smoke detector inside is input to high pressure feedback adjusting circuit jointly, regulation and high-pressure work point is set, and, be applied on the smoke detector last smoke detector output pulse signal by the high-voltage power output circuit.
3, a kind of particle counter type smoke detector as claimed in claim 1 is characterized in that the avalanche photodetector of described smoke detector for inner band thermometric diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520092733 CN2831098Y (en) | 2005-09-29 | 2005-09-29 | Particle meter type smoke detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520092733 CN2831098Y (en) | 2005-09-29 | 2005-09-29 | Particle meter type smoke detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2831098Y true CN2831098Y (en) | 2006-10-25 |
Family
ID=37136026
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520092733 Expired - Lifetime CN2831098Y (en) | 2005-09-29 | 2005-09-29 | Particle meter type smoke detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2831098Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103575658A (en) * | 2012-08-10 | 2014-02-12 | 能美防灾株式会社 | Photoelectric separation type detector |
| CN106918533A (en) * | 2017-02-27 | 2017-07-04 | 中国科学技术大学 | The measurement apparatus of smoke particle delustring scattering properties under a kind of low pressure |
| CN107209116A (en) * | 2014-12-23 | 2017-09-26 | 苹果公司 | The optical checking system and method for change including the optical path length in consideration sample |
-
2005
- 2005-09-29 CN CN 200520092733 patent/CN2831098Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103575658A (en) * | 2012-08-10 | 2014-02-12 | 能美防灾株式会社 | Photoelectric separation type detector |
| CN107209116A (en) * | 2014-12-23 | 2017-09-26 | 苹果公司 | The optical checking system and method for change including the optical path length in consideration sample |
| CN106918533A (en) * | 2017-02-27 | 2017-07-04 | 中国科学技术大学 | The measurement apparatus of smoke particle delustring scattering properties under a kind of low pressure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20090415 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |