CN215218461U - Laser detection cavity structure for smoke concentration detection - Google Patents
Laser detection cavity structure for smoke concentration detection Download PDFInfo
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- CN215218461U CN215218461U CN202120689836.2U CN202120689836U CN215218461U CN 215218461 U CN215218461 U CN 215218461U CN 202120689836 U CN202120689836 U CN 202120689836U CN 215218461 U CN215218461 U CN 215218461U
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Abstract
An object of the utility model is to provide a laser detection cavity structures for smog concentration detection, including the cavity, the cavity up end sets up the smog import, and the section sets up the smog export under the cavity, and the side of cavity sets up the straight section of transmission drum respectively and receives the straight section of drum, sets up the laser emission component in the straight section of transmission drum, sets up photosensitive element in the straight section of receiving drum, and cavity inner wall is zigzag reflection of light face, and the straight section of transmission drum is inverted zigzag reflection of light face with the straight section inner wall of receiving drum. The utility model discloses a totally closed negative pressure structure that internal surface is zigzag reflection of light face sets up laser emission pipe and photosensitive element in the horizontal direction, sets up the exit of smog sampling in the vertical direction, makes sampling smog through this survey cavity back, can stably accurately detect out smog concentration through the intensity change condition of analysis laser scattering.
Description
Technical Field
The utility model relates to a fire fighting device, in particular to a smoke detection device.
Background
Photoelectric smoke detectors have been developed using the fundamental property that smoke generated in the event of a fire can alter the light transmission characteristics. According to the scattering effect of the smoke particles on light, the smoke concentration can be stably and accurately detected by analyzing the intensity change condition after laser scattering. In the color series, the reflectance of black is small and 0.03, and the reflectance of white is large and 0.8.
Disclosure of Invention
An object of the utility model is to provide a can stabilize the accurate laser detection cavity structures who is used for smog concentration detection who detects smog concentration.
The purpose of the utility model is realized like this:
the utility model relates to a laser detection cavity structures for smog concentration detection, characterized by: the smoke-emitting laser comprises a cavity, wherein a smoke inlet is formed in the upper end face of the cavity, a smoke outlet is formed in the lower section of the cavity, a straight section of an emitting cylinder and a straight section of a receiving cylinder are respectively arranged on the side face of the cavity, a laser emitting element is arranged in the straight section of the emitting cylinder, a photosensitive element is arranged in the straight section of the receiving cylinder, the inner wall of the cavity is a sawtooth-shaped light reflecting surface, and the inner walls of the straight section of the emitting cylinder and the straight section of the receiving cylinder are inverted sawtooth-shaped light reflecting surfaces.
The utility model discloses can also include:
1. the transmitting cylinder straight section and the receiving cylinder straight section are positioned on different side surfaces of the cavity, an included angle of 120 degrees is formed between the transmitting cylinder straight section and the receiving cylinder straight section, the smoke inlet and the smoke outlet form a vertical angle, and the inverted sawtooth-shaped light reflecting surface is the reverse direction of the light path transmission in the cavity.
2. The surface roughness of the sawtooth-shaped reflecting surface on the inner wall of the cavity is not less than 1.6 mu m, and black matte paint is sprayed.
The utility model has the advantages that: the utility model discloses a totally closed negative pressure structure that internal surface is zigzag reflection of light face sets up laser emission pipe and photosensitive element in the horizontal direction, sets up the exit of smog sampling in the vertical direction, makes sampling smog through this survey cavity back, can stably accurately detect out smog concentration through the intensity change condition of analysis laser scattering.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
The invention will be described in more detail below by way of example with reference to the accompanying drawings:
with reference to fig. 1, the utility model relates to a laser detection cavity structures for smog concentration detection adopts a totally closed negative pressure structure that the internal surface is zigzag reflection of light face, makes sampling smog through this survey cavity back, can stabilize the accurate smog concentration that detects out through the intensity change condition of analysis laser scattering.
The structure meets the negative pressure requirement of not less than 0.01MPa, the inner surface is a sawtooth-shaped reflecting surface 6, the surface roughness is not less than 1.6 mu m, and the black matte paint is sprayed and used for scattering and absorbing light rays for multiple times.
The laser emission tube 1 and the photosensitive element 2 are arranged in the horizontal direction, the centers of the laser emission tube 1 and the photosensitive element 2 are at the same horizontal height, an included angle of 120 degrees is formed between the laser emission tube 1 and the photosensitive element 2, a section of cylinder straight section is respectively arranged at the front parts of the laser emission tube 1 and the photosensitive element 2, an inverted sawtooth-shaped reflecting surface 5 opposite to the propagation direction of a light path is arranged on the inner surface of the cylinder, and part of light rays which are not parallel to the direction of the light path can be reflected.
An inlet 3 and an outlet 4 for sampling smoke are arranged in the vertical direction, the sample is sucked from the inlet 3 after being primarily filtered, the outlet 4 is connected with an air exhaust fan, the drift diameter of the inlet and the outlet is 8mm, and the central axis of the air path is coincided with the peak of an included angle of 120 degrees.
Claims (3)
1. The utility model provides a laser detection cavity structures for smog concentration detection which characterized in that: the smoke-emitting laser comprises a cavity, wherein a smoke inlet is formed in the upper end face of the cavity, a smoke outlet is formed in the lower section of the cavity, a straight section of an emitting cylinder and a straight section of a receiving cylinder are respectively arranged on the side face of the cavity, a laser emitting element is arranged in the straight section of the emitting cylinder, a photosensitive element is arranged in the straight section of the receiving cylinder, the inner wall of the cavity is a sawtooth-shaped light reflecting surface, and the inner walls of the straight section of the emitting cylinder and the straight section of the receiving cylinder are inverted sawtooth-shaped light reflecting surfaces.
2. The laser detection cavity structure for smoke concentration detection as claimed in claim 1, wherein: the transmitting cylinder straight section and the receiving cylinder straight section are positioned on different side surfaces of the cavity, an included angle of 120 degrees is formed between the transmitting cylinder straight section and the receiving cylinder straight section, the smoke inlet and the smoke outlet form a vertical angle, and the inverted sawtooth-shaped light reflecting surface is the reverse direction of the light path transmission in the cavity.
3. The laser detection cavity structure for smoke concentration detection as claimed in claim 1, wherein: the surface roughness of the sawtooth-shaped reflecting surface on the inner wall of the cavity is not less than 1.6 mu m, and black matte paint is sprayed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120689836.2U CN215218461U (en) | 2021-04-06 | 2021-04-06 | Laser detection cavity structure for smoke concentration detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120689836.2U CN215218461U (en) | 2021-04-06 | 2021-04-06 | Laser detection cavity structure for smoke concentration detection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215218461U true CN215218461U (en) | 2021-12-17 |
Family
ID=79445448
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120689836.2U Active CN215218461U (en) | 2021-04-06 | 2021-04-06 | Laser detection cavity structure for smoke concentration detection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215218461U (en) |
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2021
- 2021-04-06 CN CN202120689836.2U patent/CN215218461U/en active Active
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