CN215576890U

CN215576890U - Laser gas and smoke sensing composite measuring device

Info

Publication number: CN215576890U
Application number: CN202120978523.9U
Authority: CN
Inventors: 任红军; 陈海永; 冯山虎; 武传伟; 王军锋; 杨清永; 王海超
Original assignee: Henan Zhongmin Sensor Technology Research Institute Co ltd; Hanwei Electronics Group Corp
Current assignee: Henan Zhongmin Sensor Technology Research Institute Co ltd; Hanwei Electronics Group Corp
Priority date: 2021-05-10
Filing date: 2021-05-10
Publication date: 2022-01-18
Anticipated expiration: 2031-05-10

Abstract

The utility model provides a laser gas and smoke sensing composite measuring device which comprises an optical air chamber upper cover, an optical and smoke sensing labyrinth composite cavity, a laser light source, a smoke sensing detector, a labyrinth base and a gas detector, wherein the optical and smoke sensing labyrinth composite cavity is formed by a plurality of optical air chamber upper covers; the optical and smoke-sensing maze combined cavity comprises a smoke-sensing maze measuring cavity and an optical measuring cavity; the labyrinth base is covered at the bottom of the smoke sensing labyrinth measuring cavity, and the laser light source, the smoke sensing detector and the gas detector are arranged on the labyrinth base; the gas measurement cavity is arranged at the top of the smoke-sensitive labyrinth measurement cavity, and the smoke-sensitive labyrinth measurement cavity is provided with a reflection laser channel communicated with the gas measurement cavity; the labyrinth base is provided with a reflector corresponding to the right opposite side of the laser light source, laser emitted by the laser light source enters the gas measurement cavity through the reflection laser channel after being reflected by the reflector, and returns to the gas detector through the reflection laser channel after being reacted by the gas measurement cavity.

Description

Laser gas and smoke sensing composite measuring device

Technical Field

The utility model relates to the field of smoke detectors, in particular to a laser gas and smoke sensing composite measuring device.

Background

The fire disaster is one of the main disasters frequently occurring in daily life of people, and seriously threatens the life and property safety of human beings. Along with the rapid development of urbanization, people live more intensively, and gas has entered every family, so that convenience is brought to life of people, and meanwhile, many potential safety hazards are increased.

The factors causing household fire hazard are many, deflagration caused by gas leakage, improper electricity utilization or electrical appliance aging, improper storage of inflammable matters, improper use of gas or a furnace, artificial smoking and the like can cause serious fire hazard.

Most of the detection devices on the market at present can only detect one of smoke-sensitive fire or gas leakage, and are difficult to face dangerous conditions caused by different factors, so that a detection device capable of detecting gas and smoke is urgently needed, and various dangerous conditions can be detected at the same time.

In order to solve the above problems, people are always seeking a more ideal technical solution.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a laser gas and smoke composite measuring device aiming at the defects of the prior art.

In order to achieve the purpose, the utility model adopts the technical scheme that:

A laser gas and smoke sensing composite measuring device comprises an optical air chamber upper cover, an optical and smoke sensing labyrinth composite cavity, a laser light source, a smoke sensing detector, a labyrinth base and a gas detector;

the optical and smoke-sensing maze combined cavity comprises a smoke-sensing maze measuring cavity and a gas measuring cavity;

the labyrinth base is covered at the bottom of the smoke sensing labyrinth measuring cavity, and the laser light source, the smoke sensing detector and the gas detector are arranged on the labyrinth base;

the gas measurement cavity is arranged at the top of the smoke-sensitive labyrinth measurement cavity, and the smoke-sensitive labyrinth measurement cavity is provided with a reflection laser channel communicated with the gas measurement cavity;

the labyrinth base is provided with a reflector corresponding to the right opposite side of the laser light source, laser emitted by the laser light source enters the gas measurement cavity through the reflection laser channel after being reflected by the reflector, and returns to the gas detector through the reflection laser channel after being reacted by the gas measurement cavity.

Based on the above, the gas measurement cavity is a rectangular cavity, one end of the gas measurement cavity is provided with a first reflecting surface and a third reflecting surface, and the other end of the gas measurement cavity is provided with a second reflecting surface; laser emitted by the laser source is reflected by the reflector, then reaches the first reflecting surface through the reflecting laser channel, enters the gas measuring cavity after being reflected by the first reflecting surface, irradiates the second reflecting surface to reach the third reflecting surface, and then reaches the gas detector through the reflecting laser channel after being reflected by the third reflecting surface.

Based on the above, the waterproof breathable film is pasted at the breathable hole of the upper cover of the optical air chamber.

Based on the above, the smoke detector is a plurality of, and each smoke detector and the contained angle of laser light source's light beam set up to acute angle, right angle or obtuse angle.

Based on the above, the laser light source is a light emitting unit or a plurality of light emitting units for emitting different wavelengths.

Based on the above, the laser light source adopts a multi-light-emitting laser unit, the gas detector is provided with a plurality of measuring channels, and the narrow-band filters with different central wavelengths are arranged corresponding to different measuring channels.

Based on the above, the gas detector is the gas detector who adopts the TDLAS principle to measure the target gas.

Compared with the prior art, the utility model has substantive characteristics and progress, and particularly comprises the following steps:

1. the smoke detector adopts a laser method to measure smoke and gas simultaneously, has high sensitivity, particularly adopts a TDLAS principle when measuring gas by laser, can resist the interference of smoke dust and water vapor to a certain extent compared with an infrared NDIR principle, can be used as a supplement channel of the smoke detector, can detect the smoke concentration by adopting a direct injection method when measuring gas, can make up the defect of insufficient sensitivity of a scattering method to black smoke and liquid fire, and increases the accuracy of fire judgment.

2. By fully employing optical methods to detect gases and smoke, the service life of the device is extended.

3. The gas measuring cavity for measuring gas and the labyrinth for smoke sensation share one space, the structure is compact, and the assembly process is simple.

Drawings

Fig. 1 is a schematic diagram of an explosive structure of the present invention.

Fig. 2 is a schematic illustration of an exploded structure from another perspective of the present invention.

In the figure: 1. a waterproof breathable film; 2. an optical air chamber upper cover; 3. an optical and smoke sense labyrinth composite cavity; 31. a smoke labyrinth measurement cavity; 32. a gas measurement chamber; 33. a reflected laser channel; 4. a laser light source; 5. a mirror; 6. a smoke detector; 7. a labyrinth base; 8. a gas detector; 9. a circuit board; 10. a second reflective surface; 11. a third reflective surface; 12. a first reflective surface.

Detailed Description

The technical solution of the present invention is further described in detail by the following embodiments.

Example 1

As shown in fig. 1 and 2, a laser gas and smoke sensing composite measuring device comprises an optical gas chamber upper cover 2, an optical and smoke sensing labyrinth composite cavity 3, a laser light source 4, a smoke sensing detector 6, a labyrinth base 7 and a gas detector 8;

The optical and smoke-sensing maze combined cavity 3 comprises a smoke-sensing maze measuring cavity 31 and a gas measuring cavity 32; the labyrinth base 7 is covered at the bottom of the smoke-sensitive labyrinth measuring cavity 31, and the laser light source 4, the smoke-sensitive detector 6 and the gas detector 8 are arranged on the labyrinth base 7; the gas measurement cavity 32 is arranged at the top of the smoke-sensitive labyrinth measurement cavity 31, and the smoke-sensitive labyrinth measurement cavity 31 is provided with a reflection laser channel 33 communicated with the gas measurement cavity 32;

the labyrinth base 7 is provided with a reflector 5 corresponding to the right opposite surface of the laser light source 4, laser emitted by the laser light source 4 is reflected by the reflector 5 and then enters the gas measurement cavity 32 through the reflection laser channel 33, and the gas measurement cavity 32 is reacted and then returns to the gas detector 8 through the reflection laser channel 33.

Specifically, the gas measurement cavity 32 is a rectangular cavity, one end of the gas measurement cavity 32 is provided with a first reflecting surface 12 and a third reflecting surface 11, and the other end is provided with a second reflecting surface 10; the laser emitted by the laser source 4 is reflected by the reflector 5, reaches the first reflecting surface 12 through the reflecting laser channel 33, enters the gas measuring cavity 32 after being reflected by the first reflecting surface 12, irradiates the second reflecting surface 10 to reach the third reflecting surface 11, and reaches the gas detector 8 through the reflecting laser channel 33 after being reflected by the third reflecting surface 11.

In the device, an optical air chamber upper cover 2 and an optical and smoke-sensing maze composite cavity 3 are combined into a complete optical cavity, and a waterproof breathable film 1 is adhered to an air vent on the optical air chamber upper cover 2.

In this embodiment, the smoke detector 6 may be one or more, the included angle between the smoke detector 6 and the laser beam of the laser light source may be an acute angle, a right angle or an obtuse angle according to different types of smoke to be measured, and different included angles may detect smoke with different particle sizes.

The laser light source 4 used in the device of the embodiment adopts a single light-emitting laser unit, and the gas detector 8 is a gas detector for measuring target gas by using the TDLAS principle; the sensitive wavelength of the smoke detector 6 and the sensitive wavelength of the gas detector 8 are substantially the same, for example, the sensitive wavelength of the smoke detector 6 and the sensitive wavelength of the gas detector 8 both use 764nm (for measuring oxygen) or 1650.9nm (for measuring methane) laser.

The technical principle that this embodiment device adopted TDLAS detects gas leakage, adopts laser scattering principle to detect smog, carries out the alarm action when gas detector monitors gas concentration and reaches the warning value, carries out fire alarm when the smoke detector monitors smog and takes place as the early warning of conflagration, and both form an effectual complementary environmental safety guarantee. In addition, when the smoke detector is used specifically, the smoke detector can detect the changed signals and detect the smoke concentration through a direct injection method, the defect that a scattering method is not sensitive to black smoke and liquid fire is overcome, and the accuracy of fire judgment is improved.

Example 2

This example differs from example 1 in that: the laser light source 4 adopts a multi-light-emitting laser unit, the gas detector 8 is provided with a plurality of measuring channels, and narrow-band filters with different central wavelengths are arranged corresponding to different measuring channels, so that multiple gases are monitored.

In this embodiment, the sensitive wavelength of the smoke detector 6 is different from the sensitive wavelength of the gas detector 8, wherein the laser wavelength for measuring smoke may be red laser light of about 650nm, or infrared light of 790nm to 940nm, and the near-infrared wavelength used by the gas detection laser is 1653nm and 1651nm commonly used for detecting methane, 1578nm commonly used for detecting carbon dioxide, 1567nm and 1570nm commonly used for detecting carbon monoxide, and the like. As technology develops and laser cost decreases, the laser wavelength for gas detection in this embodiment may also use mid-infrared laser.

Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention and not to limit the same; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the utility model or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the utility model as defined by the appended claims.

Claims

1. The utility model provides a gaseous and smoke sensing combined measuring device of laser which characterized in that: the optical smoke-sensitive labyrinth type gas sensor comprises an optical air chamber upper cover, an optical smoke-sensitive labyrinth composite cavity, a laser light source, a smoke-sensitive detector, a labyrinth base and a gas detector;

2. The laser gas and smoke composite measuring device according to claim 1, wherein: the gas measurement cavity is a rectangular cavity, a first reflecting surface and a third reflecting surface are arranged at one end in the gas measurement cavity, and a second reflecting surface is arranged at the other end in the gas measurement cavity; laser emitted by the laser source is reflected by the reflector, then reaches the first reflecting surface through the reflecting laser channel, enters the gas measuring cavity after being reflected by the first reflecting surface, irradiates the second reflecting surface to reach the third reflecting surface, and then reaches the gas detector through the reflecting laser channel after being reflected by the third reflecting surface.

3. The laser gas and smoke composite measuring device according to claim 1, wherein: and a waterproof breathable film is stuck at the breathable hole of the upper cover of the optical air chamber.

4. The laser gas and smoke composite measuring device according to claim 1, wherein: the smoke detector is a plurality of smoke detectors, and the included angle between each smoke detector and the light beam of the laser light source is set to be an acute angle, a right angle or an obtuse angle.

5. The laser gas and smoke composite measuring device according to claim 1, wherein: the laser light source is a light emitting unit or a plurality of light emitting units for emitting different wavelengths.

6. The laser gas and smoke composite measuring device according to claim 1, wherein: the laser light source adopts a plurality of light-emitting laser units, the gas detector is provided with a plurality of measuring channels, and narrow-band filters with different central wavelengths are arranged corresponding to different measuring channels.

7. The laser gas and smoke composite measuring device according to claim 1, wherein: the gas detector is a gas detector for measuring target gas by adopting a TDLAS principle.