CN217385122U

CN217385122U - Scattering cavity device for detecting dust concentration

Info

Publication number: CN217385122U
Application number: CN202220795673.0U
Authority: CN
Inventors: 刘占涛; 朱永剑; 王杰; 尹文立
Original assignee: Hengtianyi Technology Shenzhen Co ltd
Current assignee: Hengtianyi Technology Shenzhen Co ltd
Priority date: 2022-04-07
Filing date: 2022-04-07
Publication date: 2022-09-06
Anticipated expiration: 2032-04-07

Abstract

The utility model relates to a scattering cavity device for detecting dust concentration, which comprises an air chamber; the three side surfaces of the air chamber are respectively connected with a first scattering cavity, a second scattering cavity and a third scattering cavity in a penetrating way; the first scattering cavity is communicated with a sample gas inlet; sample gas enters the gas chamber along the first scattering cavity; the second scattering chamber is connected with a light inlet and a sample gas outlet in a run-through manner; the laser emits a light source towards the air chamber; a first air curtain is arranged on the second scattering cavity; and the third scattering cavity is provided with an optical fiber receiving assembly and a second air curtain. The scattering cavity device for detecting the dust concentration is simple in structure, and not only can sample gas be prevented from being in direct contact with the optical fiber receiving assembly and the laser device by respectively filling the first air curtain and the second air curtain with protective gas with certain air pressure; the scattering cavity device can move towards the laser lens and the optical fiber lens of the optical fiber receiving assembly in the reverse direction, and has a cleaning effect, so that the overall detection precision of the scattering cavity device for detecting the dust concentration is more accurate.

Description

Scattering cavity device for detecting dust concentration

Technical Field

The utility model relates to a dust measuring apparatu's technical field, more specifically say, relate to a scattering chamber device for detecting dust concentration.

Background

The existing dust measuring instrument is widely used for continuously measuring particle emission in various industrial fields such as pollution source emission, powder manufacturing and processing, laboratories, new materials and the like, and can be applied to particle measurement occasions of various extreme occasions such as high temperature, high pressure, high humidity, high corrosivity and the like.

The existing dust scattering cavity device generally adopts equipment with a laser sensor as a core, gas to be measured enters the laser sensor, laser emitted by a laser penetrates through sampling gas, dust in the gas is scattered by a laser focus or near parallel light, a photosensitive tube opposite to the laser receives light intensity to generate an electric signal, and the electric signal is processed by an amplifying circuit and a CPU to obtain a readable signal to be output so as to obtain a measured value. If no protection (protection blowing) measures are taken, optical elements in the laser can easily contact with suspended matters, and when pollutants fall on the surface of a lens, the measurement accuracy of the dust scattering cavity device on dust can be influenced.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model lies in, to the above-mentioned defect of prior art, a scattering chamber device for detecting dust concentration is provided.

The utility model provides a technical scheme that its technical problem adopted is: a scattering cavity device for detecting dust concentration comprises a gas chamber; the three side surfaces of the air chamber are respectively connected with a first scattering cavity, a second scattering cavity and a third scattering cavity in a penetrating way; a sample gas inlet for sample gas to enter is connected to the first scattering cavity in a through manner; the sample gas enters the gas chamber along the first scattering cavity; the second scattering chamber is connected with a light inlet and a sample gas outlet through which the laser can be inserted; the laser emits a light source towards the gas chamber; the second scattering cavity is also provided with a first air curtain for preventing dust in the sample gas from falling on the laser; the third scattering cavity is also provided with an optical fiber receiving assembly for detecting the sample gas in the gas chamber and a second gas curtain for preventing dust in the sample gas from falling on the optical fiber receiving assembly;

the scattering cavity device for detecting dust concentration of the utility model is characterized in that the first scattering cavity is also connected with a back flushing port in a through way;

the scattering cavity device for detecting dust concentration of the utility model is characterized in that the first scattering cavity and the third scattering cavity are positioned at two opposite sides of the air chamber and are positioned on the same horizontal line;

the scattering cavity device for detecting dust concentration in the utility model is characterized in that one surface of the air chamber facing the first scattering cavity is an inclined surface;

the scattering cavity device for detecting dust concentration of the utility model is characterized in that the area of the cross section of the first scattering cavity is gradually reduced along the direction of the air chamber;

the scattering cavity device for detecting dust concentration of the utility model is characterized in that an included angle between the light emitting direction of the laser and the light sensing direction of the optical fiber receiving assembly is an obtuse angle;

a scattering chamber device for detecting dust concentration, wherein, first air curtain is located the appearance gas discharge port with between the laser instrument.

The beneficial effects of the utility model reside in that: (1) the scattering cavity device for detecting the dust concentration is simple in structure, a measured sample gas enters the first scattering cavity and enters the air chamber, the third scattering cavity is axially injected with laser, the laser is injected into the air chamber and scatters dust in the sample gas, the laser is received by the optical fiber receiving assembly in the third scattering cavity, a signal is generated and transmitted to an external main board, and a measured value is obtained; protective gas with certain air pressure is respectively filled in the first air curtain and the second air curtain, so that the sample gas can be prevented from directly contacting the optical fiber receiving assembly and the laser; the scattering cavity device can also move towards the laser lens and the optical fiber lens of the optical fiber receiving assembly in the reverse direction, and has a cleaning effect, so that the overall detection precision of the scattering cavity device for detecting the dust concentration is more accurate;

(2) the back flushing port is matched with the sample gas inlet, so that dust in the sample gas can be quickly blown up, and the dust in the sample gas is timely discharged out of the first scattering cavity after being measured and is not adsorbed in the gas chamber;

(3) one surface of the air chamber facing the first scattering cavity is arranged to be an inclined surface, so that light rays emitted by the laser are conveniently refracted towards the optical fiber receiving assembly, and the light sensing area of the optical fiber receiving assembly is increased; on the other hand, the dust is exposed in the range which can be detected by the optical fiber receiving component, so that the detection of the optical fiber receiving component is more accurate.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be further described with reference to the accompanying drawings and embodiments, wherein the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained without inventive efforts according to the drawings:

fig. 1 is a schematic structural diagram of a scattering chamber device for detecting dust concentration according to a preferred embodiment of the present invention;

fig. 2 is a cross-sectional view of a scattering chamber device for detecting dust concentration according to a preferred embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following description will be made clearly and completely in conjunction with the technical solutions in the embodiments of the present invention, and obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, belong to the scope of protection of the present invention.

It should be understood that the terms "first," "second," "third," and "fourth," etc. in the description and claims and in the accompanying drawings are used for distinguishing between different elements and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

"plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.

A scattering chamber device for detecting dust concentration according to a preferred embodiment of the present invention, as shown in fig. 1-2, includes an air chamber 100; the three side surfaces of the air chamber 100 are respectively connected with a first scattering cavity 101, a second scattering cavity 102 and a third scattering cavity 103 in a penetrating manner; a sample gas inlet 104 for sample gas (not shown) to enter is connected to the first scattering cavity 101; sample gas (not shown) enters the gas cell 100 along the first scattering chamber 101; a light inlet 105 for inserting a laser (not shown) and a sample gas outlet 106 are connected to the second scattering cavity 102; a laser (not shown) emits a light source towards the gas cell 100; the second scattering chamber 102 is further provided with a first air curtain 107 for preventing dust in the sample gas (not shown) from falling on the laser (not shown); the third scattering chamber 103 is further provided with a fiber receiving module (not shown) for detecting a sample gas (not shown) in the gas chamber 100, and a second air curtain 108 for preventing dust in the sample gas (not shown) from falling on the fiber receiving module (not shown).

The scattering cavity device for detecting the dust concentration is simple in structure, a measured sample gas enters the first scattering cavity and enters the air chamber, the third scattering cavity is axially injected with laser, the laser is injected into the air chamber and scatters dust in the sample gas, the laser is received by the optical fiber receiving assembly in the third scattering cavity, a signal is generated and transmitted to an external main board, and a measured value is obtained; protective gas with certain air pressure is respectively filled into the first air curtain and the second air curtain, so that the sample gas can be prevented from being directly contacted with the optical fiber receiving assembly and the laser; the scattering cavity device can also move towards the laser lens and the optical fiber lens of the optical fiber receiving assembly in the reverse direction, and has a cleaning effect, so that the overall detection precision of the scattering cavity device for detecting the dust concentration is more accurate;

it is worth mentioning that the laser is prior art, and the laser can also be other devices in prior art which emit light towards the gas chamber; the optical fiber receiving assembly includes an optical fiber lens, a light transmitting portion and a light output portion, which are used for receiving light source information in the prior art, and the optical fiber receiving assembly may also be other prior arts, which are not described herein again.

Specifically, the first scattering cavity 101 is also connected with a back-blowing port 109 in a through manner, and the back-blowing port is matched with the sample gas inlet, so that the back-blowing effect is increased; the dust sample gas in the sample gas inlet is blown out through the back blowing port in the first scattering cavity, so that the dust in the sample gas can be blown up quickly, and the dust in the sample gas is discharged out of the first scattering cavity in time after being measured and is not adsorbed in the gas chamber.

Specifically, the first scattering cavity 101 and the third scattering cavity 103 are located on two opposite sides of the gas chamber 100 and on the same horizontal line, so that the sample gas flows more smoothly and the received resistance is smaller.

Specifically, one side of the gas chamber 100 facing the first scattering cavity 101 is an inclined plane; and the included angle between the light emitting direction of the laser (not shown) and the light sensing direction of the optical fiber receiving assembly (not shown) is an obtuse angle; on one hand, light rays emitted by the laser are conveniently refracted towards the optical fiber receiving assembly, and the photosensitive area of the optical fiber receiving assembly is increased; on the other hand, the dust is exposed in the range which can be detected by the optical fiber receiving component, so that the detection of the optical fiber receiving component is more accurate.

Specifically, the area of the cross section of the first scattering cavity 101 gradually decreases along the direction of the gas cell 100, facilitating the sample gas to enter into the gas cell.

Specifically, the first gas curtain 107 is located between the sample gas discharge port 106 and the laser (not shown); the cleanliness of the laser lens is protected through the first air curtain, and the cleanliness of the optical fiber lens is protected through the second air curtain; the integral detection precision of the scattering cavity device for detecting the dust concentration is more accurate.

It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are considered to be within the scope of the invention as defined by the following claims.

Claims

1. A scattering chamber device for detecting dust concentration is characterized by comprising an air chamber; the three side surfaces of the air chamber are respectively connected with a first scattering cavity, a second scattering cavity and a third scattering cavity in a penetrating way; a sample gas inlet for sample gas to enter is connected to the first scattering cavity in a through manner; the sample gas enters the gas chamber along the first scattering cavity; the second scattering cavity is connected with a light inlet and a sample gas outlet through which the laser can be inserted; the laser emits a light source towards the gas chamber; the second scattering cavity is also provided with a first air curtain for preventing dust in the sample gas from falling on the laser; the third scattering cavity is further provided with an optical fiber receiving assembly for detecting the sample gas in the gas chamber, and a second gas curtain for preventing dust in the sample gas from falling on the optical fiber receiving assembly.

2. The diffusion chamber assembly of claim 1 wherein a blow-back port is further connected through said first diffusion chamber.

3. The scattering cavity device of claim 2, wherein the first scattering cavity and the third scattering cavity are located on opposite sides of the gas chamber and on the same horizontal line.

4. The scattering cavity means of claim 1, wherein a side of said gas chamber facing said first scattering cavity is beveled.

5. The scattering cavity arrangement as claimed in claim 4, wherein the area of the first scattering cavity cross-section decreases gradually in the direction of the gas chamber.

6. The scattering cavity device as claimed in claim 5, wherein the angle between the light emitting direction of the laser and the light sensing direction of the fiber receiving assembly is an obtuse angle.

7. The scattering chamber device of any of claims 1-6 wherein said first gas curtain is located between said sample gas outlet port and said laser.