CN215812274U

CN215812274U - Particulate matter measuring module

Info

Publication number: CN215812274U
Application number: CN202121718021.9U
Authority: CN
Inventors: 安瑞君; 殷光升; 白肖; 赵金爽
Original assignee: Qingdao Mingde Environmental Protection Apparatus Co ltd
Current assignee: Qingdao Mingde Environmental Protection Apparatus Co ltd
Priority date: 2021-07-27
Filing date: 2021-07-27
Publication date: 2022-02-11
Anticipated expiration: 2031-07-27

Abstract

The utility model provides a particle measuring module which comprises a gas chamber, a gas inlet, a gas outlet, a laser emitting unit, a laser receiving unit and a light trap, wherein the bottom surface of the gas chamber is a concave-convex surface. According to the utility model, the concave-convex design is carried out on the large-amount gathering area of the background light of the module air chamber, so that the reflection elimination and absorption of the background light are realized, the influence of the background light on the measurement result is greatly reduced, and the measurement precision is improved.

Description

Particulate matter measuring module

Technical Field

The utility model relates to the technical field of smoke dust measuring devices, in particular to a particulate matter measuring module

Background

The particle online monitoring instrument based on the laser scattering principle has higher sensitivity and wider application in the aspect of low-concentration particle measurement. The current online particulate matter monitoring instrument comprises a laser emission module, a receiving module and an air chamber, wherein an air inlet and an air outlet are formed in the air chamber, a light source opening is designed in one side of the air chamber, and a light trap is designed in the opposite side of the light source opening. During the work, the flue gas lets in the air chamber through the air inlet, then starts the laser emission module, and the laser emission module can send the light source signal and can take place the scattering through the light source mouth entering air chamber on the particulate matter is shone to the light beam, and the light that does not scatter can be eliminated in the light trap directly to, and the scattered light can enter into receiving module and change the signal of telecommunication into, and the signal of telecommunication is after signal amplifier enlargies, according to scattering theory alright calculate the concentration of particulate matter.

The existing particle online detection instrument has the following defects in the using process: when the concentration of ultra-low particulate matters is measured, due to the fact that background light is not sufficiently eliminated, on one hand, interference on a measurement result is caused, and accuracy of the measurement result is influenced; on the other hand, when no particulate matter is extracted by the collected light, the receiving module already receives a certain amount of light, which is equivalent to increasing the lower limit concentration of the measurement object, i.e., causing the receiving area of the receiving module to narrow. And secondly, reflecting the scattered light by a reflector by part of manufacturers to ensure that the attenuation of the reflected signal is serious, thereby influencing the measurement result.

SUMMERY OF THE UTILITY MODEL

In order to solve the defect that the measurement result of the existing particle online detection instrument is inaccurate, the utility model provides a particle measurement module, which adopts the following technical scheme:

a particle measurement module comprises an air chamber, an air inlet, an air outlet, a laser emission unit, a laser receiving unit, a light source port and a light trap, wherein the bottom surface of the air chamber is a concave-convex surface.

Furthermore, the light trap on the inner wall of the air chamber is a concave-convex surface.

Furthermore, an air inlet pipe connected with the air inlet is arranged in the air chamber, and a plurality of transverse grains are arranged on the outer pipe wall of the air inlet pipe.

Furthermore, the periphery of the light source opening on the inner wall of the air chamber is a concave-convex surface.

Further, a reflector assembly is mounted on the top surface of the air chamber, and comprises a coated reflector and a reflector base.

Further, the gas outlet is square, a gas outlet cylinder is installed at the gas outlet, and the inner diameter of the gas outlet cylinder is smaller than the width of the gas outlet.

Furthermore, the concave-convex surface is a sawtooth pattern.

Further, the reflector is a coated reflector.

Compared with the prior art, the utility model has the following advantages and positive effects:

according to the utility model, the concave-convex design is carried out on the large-amount gathering area of the background light of the module air chamber, the reflection elimination absorption is carried out on the background light, the influence of the background light on the measurement result is greatly reduced, and the measurement precision is improved.

The utility model reflects the scattered light through the reflector, so that the scattered light is accurately received by the laser receiving unit, and the accuracy of the measurement result is ensured.

The design of square excircle in adopting at gas outlet department guarantees the stability of the interior air current of module gas chamber, has further also improved measuring stability.

Drawings

FIG. 1 is a schematic illustration of an explosive structure according to an embodiment of the present invention;

FIG. 2 is a top view of the air chamber shown in FIG. 1 (with the air outlet cylinder omitted);

FIG. 3 is a perspective view one of the air chambers shown in FIG. 2;

FIG. 4 is a second perspective view of the air chamber shown in FIG. 2;

in the above figures: 1. an air chamber; 1-1, an air inlet; 1-2, an air inlet pipe; 1-2-2, transverse striation; 1-3, air outlet; 1-4, an air outlet cylinder; 1-5, the bottom surface of the air chamber; 2. a laser emitting unit; 2-1, laser lamp; 2-2, lamp holder; 3. a laser receiving unit; 3-1, a laser receiver; 3-2, a receiver seat; 4. an upper cover; 5. a mirror assembly; 5-1, a mirror cover; 5-2, a reflector; 5-3, a lens base; 5-4, glass sheets; 6. a light source port; 7. a light trap.

Detailed Description

To facilitate an understanding of the present invention by those skilled in the art, specific embodiments thereof are described below with reference to the accompanying drawings.

Referring to fig. 1, the particulate matter measuring module of the present embodiment includes a laser emitting unit 2, a laser receiving unit 3, an air chamber 1, an air inlet 1-1, and an air outlet 1-3.

The laser emission unit 2 comprises a laser lamp 2-1 and a lamp holder 2-2, the laser lamp 2-1 is fixed on the lamp holder 2-2 through a set screw, the lamp holder 2-2 is fixed on the air chamber 1 through a sealing ring, and a glass sheet 5-4 is clamped between the lamp holder 2-2 and the air chamber 1; the laser receiving unit 3 comprises a laser receiver 3-1 and a receiver base 3-2, and the receiver base 3-2 is fixed on the air chamber 1 through a sealing gasket.

An upper cover 4 of the air chamber 1 is fixed on the air chamber 1 through a sealing ring, a reflector assembly 5 is installed on the upper cover 4, the reflector assembly 5 sequentially comprises a reflector cover 5-1, a coated reflector 5-2 and a reflector 5-2 seat 5-3 from top to bottom, and a glass sheet 5-4 is clamped between the reflector 5-2 seat 5-3 and the upper cover 4 of the air chamber 1. The reflector 5-2 seat 5-3 is a cylindrical barrel, the height of the cylindrical barrel is set according to the focal length of the reflector 5-2, and the scattered light is reflected by the coated reflector 5-2, so that the scattered light is accurately received by the laser receiving unit 3, and the accuracy of a measuring result is ensured.

The bottom surface 1-5 of the air chamber, the side wall of the light trap 7 and the periphery of the light source opening 6 on the inner wall of the air chamber 1 are all concave-convex surfaces, and for convenience in processing, the background light large-amount gathering area is processed into sawtooth grains. In addition, an air inlet 1-1 in the air chamber 1 is connected with an air inlet pipe 1-2, the air inlet pipe 1-2 extends to the edge of an inlet of a signal receiver, so that particles entering the air chamber 1 can be irradiated by laser, the measurement accuracy can be ensured, if the particles do not extend, the particles enter the air chamber 1 and are diffused, and the laser lamp 2-1 cannot be ensured to irradiate all the particles. The wall of the air inlet pipe 1-2 is provided with a plurality of transverse grains 1-2-2, and the transverse grains 1-2-2 are designed to further realize reflection, elimination and absorption of background light. The design of the inner square and the outer circle is adopted at the gas outlet 1-3 of the gas chamber 1, specifically, the gas outlet 1-3 is square, the gas outlet 1-3 is provided with the gas outlet cylinder 1-4, the gas outlet cylinder 1-4 is arranged at the gas outlet 1-3 through the mounting seat, and the inner diameter of the gas outlet cylinder 1-4 is smaller than the width of the gas outlet 1-3, so that the gas flow entering the gas chamber 1 can be diffused to a certain extent, the gas flow is prevented from reflecting back and forth in the gas chamber 1, and the square opening enables the gas flow to be converged to the maximum extent, and the gas flow in the gas chamber 1 is ensured to be more stable.

The laser emission unit 2 emits laser light, the laser light and particles are scattered in the air chamber 1, the scattered light is reflected to the laser receiving unit 3 through the coating reflecting mirror 5-2, and the particle concentration is obtained through subsequent processing. The utility model can realize the accurate measurement of the ultralow concentration of the particulate matter and can improve the stability and accuracy of the measurement.

The above-described embodiments of the present invention do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. The utility model provides a particulate matter measuring module, includes air chamber, air inlet, gas outlet, laser emission unit, laser receiving element, light source mouth and light trap, its characterized in that: the bottom surface of the air chamber is a concave-convex surface.

2. The particulate matter measurement module of claim 1, wherein: the light trap on the inner wall of the air chamber is a concave-convex surface.

3. The particulate matter measuring module according to claim 1, wherein an intake pipe connected to the intake port is provided in the gas chamber, and an outer wall of the intake pipe has a plurality of cross-striations.

4. The particle measurement module of claim 1, wherein the periphery of the light source opening on the inner wall of the air chamber is concave-convex.

5. The particulate matter measurement module of claim 1, wherein the top surface of the plenum is mounted with a mirror assembly comprising a coated mirror and a mirror mount.

6. The particulate matter measuring module of claim 1, wherein the gas outlet is square, and a gas outlet cylinder is mounted at the gas outlet, and an inner diameter of the gas outlet cylinder is smaller than a width of the gas outlet.

7. The particulate matter measurement module of claim 1, 2 or 4, wherein the asperities are saw-tooth patterns.

8. The particulate matter measurement module of claim 5, wherein the mirror is a coated mirror.