CN213365729U - Photoelectric smoke detector for aircraft cargo hold - Google Patents
Photoelectric smoke detector for aircraft cargo hold Download PDFInfo
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- CN213365729U CN213365729U CN202022754665.5U CN202022754665U CN213365729U CN 213365729 U CN213365729 U CN 213365729U CN 202022754665 U CN202022754665 U CN 202022754665U CN 213365729 U CN213365729 U CN 213365729U
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Abstract
The utility model provides an airplane cargo hold photoelectric smoke detector, which comprises a dual-waveband smoke detector, a signal processing circuit board and an alarm device; the data transmission of the dual-waveband smoke-sensing detector is connected with the signal processing circuit board, and the data transmission of the signal processing circuit board is connected with the alarm device; the dual-band smoke detector is used for emitting light waves with two wavelengths to detect and identify smoke and receiving the light waves emitted due to smoke shielding; transmitting the reflected wave signal to a signal processing circuit board; the signal processing circuit board is used for comparing difference and reasonably setting a threshold value, and outputs a fire smoke judgment signal and transmits the fire smoke judgment signal to the alarm device; and the alarm device gives an alarm if the combustion smoke is judged to exist. The utility model discloses can take the initiative, survey the conflagration flue gas in real time, convenient to use, accommodation is wide, and surveys the correct rate height.
Description
Technical Field
The utility model relates to an aircraft cargo hold photoelectric smoke detector belongs to smoke detector technical field.
Background
The existing smoke detector has two smoke sensing modes of photoelectric mode and ion mode. When the photoelectricity is felt the cigarette, too much granule in the environment can lead to light emission reflection and refraction, leads to smoke transducer to judge the mistake, and then triggers the fire alarm. When the ion is used for smoke sensing, particles in the air influence ionization in the air, and a fire alarm is triggered, but the particles are not necessarily smoke particles caused by fire, and false alarms can be caused by mechanical failure. The common smoke detection alarm device cannot adapt to the change of pressure environment, so that the smoke components and the smoke particle diameters are changed, fire smoke particles and interference particles are difficult to distinguish, and false alarm is easy to occur. The environment of the cargo hold of the airplane is complex and changeable, the types of transported goods are more, and sand dust, cotton wool, animal hair and the like floating in the cargo hold can trigger the smoke detector to alarm.
Therefore, the existing smoke detector has limited application range, is easily influenced by the environment and has high false alarm rate.
SUMMERY OF THE UTILITY MODEL
The utility model provides an aircraft cargo hold photoelectric smoke detector solves prior art and has the shortcoming that the misstatement rate is high, the utility model discloses can reduce the misstatement rate that aircraft cargo hold smoke was felt by a wide margin, improve flight safety level.
The specific technical scheme is as follows:
the photoelectric smoke detector of the airplane cargo hold comprises a dual-band smoke detector, a signal processing circuit board and an alarm device; the data transmission of the dual-waveband smoke-sensing detector is connected with the signal processing circuit board, and the data transmission of the signal processing circuit board is connected with the alarm device;
the dual-band smoke detector is used for emitting light waves with two wavelengths to detect and identify smoke and receiving the light waves emitted due to smoke shielding; transmitting the reflected wave signal to a signal processing circuit board;
the signal processing circuit board is used for comparing difference and reasonably setting a threshold value, and outputs a fire smoke judgment signal and transmits the fire smoke judgment signal to the alarm device;
and the alarm device gives an alarm if the combustion smoke is judged to exist.
The dual-band smoke detector is used for emitting infrared light waves and blue light waves with two wavelengths.
The detection method of the photoelectric smoke detector of the aircraft cargo hold comprises the following steps:
s1, testing infrared light and blue light reflected wave amplitude values of smoke generated by combustion of different types of combustion materials in a full-scale village simulated airplane cargo hold by using the dual-band smoke detector, and establishing a database;
s2, determining the range of the amplitude value of the infrared light reflected light wave (A0, A1) and the range of the amplitude value of the blue light reflected light wave (B0, B1) under the condition that fire smoke is generated in the cargo compartment of the airplane according to the infrared light and blue light reflected light wave amplitude values in the database;
s3, the infrared light and blue light reflected wave amplitude values detected in real time in the cargo hold of the airplane are respectively A (t) and B (t), and the signal processing circuit board calculates A (t)/A0 and B (t)/B0;
s4, if A (t)/A0 is 0 or B (t)/B0 is 0, the signal processing circuit board judges that no fire occurs, and inputs a judgment signal to the alarm device, and the alarm device does not send out an alarm; if A (t)/A0>0 and B (t)/B0>0, proceed to step S5;
s5, if A0< A (t) < A1 or B0< B (t) < B1, the signal processing circuit board judges that a fire occurs, the judgment signal is input to the alarm device, and the alarm device gives an alarm.
The utility model discloses establish burning material smog database based on two kinds of detection wave bands of infrared, blue light, multiple fuel burning smog light wave emissivity and ratio relation under the accurate simulation aircraft cargo hold environment. According to the actually measured light wave reflectivity and the ratio, the threshold value is intelligently set, so that the fire smoke and the interference particles are effectively distinguished, and the alarm accuracy for smoldering fires is high.
The utility model discloses can take the initiative, survey the conflagration flue gas in real time, convenient to use, accommodation is wide, and surveys the correct rate height.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
The specific technical solution of the present invention will be described with reference to the embodiments.
As shown in fig. 1, the photoelectric smoke detector for the cargo hold of the airplane comprises a dual-band smoke detector 1, a signal processing circuit board 2 and an alarm device 3; the dual-band smoke detector 1 is connected with the signal processing circuit board 2 in a data transmission way, and the signal processing circuit board 2 is connected with the alarm device 3 in a data transmission way;
the dual-band smoke detector 1 is used for emitting light waves with two wavelengths to detect and identify smoke and receiving the light waves emitted due to smoke shielding; transmitting the reflected wave signal to the signal processing circuit board 2;
the signal processing circuit board 2 is used for difference comparison and reasonable threshold setting, and the signal processing circuit board 2 outputs a fire smoke judgment signal and transmits the fire smoke judgment signal to the alarm device 3;
and the alarm device 3 gives an alarm if the combustion smoke exists.
The dual-band smoke detector 1 is used for emitting infrared light waves and blue light waves with two wavelengths.
The detection method of the photoelectric smoke detector of the aircraft cargo hold comprises the following steps:
s1, testing infrared light and blue light reflected wave amplitude values of smoke generated by combustion of different types of combustion materials in a full-scale village simulated airplane cargo hold by the dual-band smoke detector 1, and establishing a database;
s2, determining the range of the amplitude value of the infrared light reflected light wave (A0, A1) and the range of the amplitude value of the blue light reflected light wave (B0, B1) under the condition that fire smoke is generated in the cargo compartment of the airplane according to the infrared light and blue light reflected light wave amplitude values in the database;
s3, the infrared light and blue light reflected wave amplitude values detected in real time in the cargo hold of the airplane are respectively A (t) and B (t), and the signal processing circuit board 2 calculates A (t)/A0 and B (t)/B0;
s4, if a (t)/a0 is 0 or B (t)/B0 is 0, the signal processing circuit board 2 judges that no fire occurs, inputs the judgment signal to the alarm device 3, and the alarm device 3 does not give an alarm; if A (t)/A0>0 and B (t)/B0>0, proceed to step S5;
s5, if a0< a (t) < a1 or B0< B (t) < B1, the signal processing circuit board 2 determines that a fire has occurred, inputs a determination signal to the alarm device 3, and the alarm device 3 issues an alarm.
Claims (2)
1. The photoelectric smoke detector for the airplane cargo hold is characterized by comprising a dual-band smoke detector (1), a signal processing circuit board (2) and an alarm device (3); the dual-band smoke detector (1) is connected with the signal processing circuit board (2) in a data transmission manner, and the signal processing circuit board (2) is connected with the alarm device (3) in a data transmission manner;
the dual-band smoke detector (1) is used for emitting light waves with two wavelengths to detect and identify smoke and receiving the light waves emitted due to smoke shielding; transmitting the reflected wave signal to a signal processing circuit board (2);
the signal processing circuit board (2) is used for difference comparison and threshold setting, and the signal processing circuit board (2) outputs a fire smoke judgment signal and transmits the fire smoke judgment signal to the alarm device (3);
and the alarm device (3) gives an alarm if the combustion smoke exists.
2. An aircraft cargo hold photoelectric smoke detector according to claim 1, wherein said dual band smoke detector (1) is adapted to emit both infrared and blue light wavelengths.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022754665.5U CN213365729U (en) | 2020-11-25 | 2020-11-25 | Photoelectric smoke detector for aircraft cargo hold |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022754665.5U CN213365729U (en) | 2020-11-25 | 2020-11-25 | Photoelectric smoke detector for aircraft cargo hold |
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| CN213365729U true CN213365729U (en) | 2021-06-04 |
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| CN202022754665.5U Active CN213365729U (en) | 2020-11-25 | 2020-11-25 | Photoelectric smoke detector for aircraft cargo hold |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112330918A (en) * | 2020-11-25 | 2021-02-05 | 中国民用航空飞行学院 | Photoelectric smoke detector for aircraft cargo hold and detection method thereof |
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- 2020-11-25 CN CN202022754665.5U patent/CN213365729U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112330918A (en) * | 2020-11-25 | 2021-02-05 | 中国民用航空飞行学院 | Photoelectric smoke detector for aircraft cargo hold and detection method thereof |
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