CN210953729U

CN210953729U - Tail gas particulate matter concentration sensor structure

Info

Publication number: CN210953729U
Application number: CN201921502268.XU
Authority: CN
Inventors: 姚光荣; 周华胜; 王其
Original assignee: Shenzhen Huiye Information Technology Co ltd
Current assignee: Shenzhen Huiye Information Technology Co ltd
Priority date: 2019-09-10
Filing date: 2019-09-10
Publication date: 2020-07-07
Anticipated expiration: 2029-09-10

Abstract

The utility model discloses a tail gas particulate matter concentration sensor structure relates to the technical field of vehicle exhaust emission control, including gas production room, isolation chamber and optic fibre wire jumper, the gas production room is parallel to be run through in the blast pipe. The middle part of the gas production chamber is hollowed to facilitate tail gas circulation, and the hollowed area is limited in the exhaust pipe to prevent tail gas leakage; the isolation chambers are respectively arranged at two ends of the gas production chamber to prevent tail gas from polluting optical elements, the front end of the isolation chamber is connected with the gas production chamber, and the rear end of the isolation chamber is connected with the optical fiber jumper through a flange. The utility model discloses a can convenient and fast ground measure tail gas particulate matter concentration, and measurement accuracy does not receive temperature variation's influence, simple structure, and the cost is lower.

Description

Tail gas particulate matter concentration sensor structure

Technical Field

The utility model relates to a technical field of vehicle exhaust emission control, concretely relates to exhaust particulate matter concentration sensor structure.

Background

In order to implement the notice of the action of the state service institute on the three-year action of winning the guard war of the blue sky, the government of each province and city starts to research the implementation method of the six emission standards of the state of the guan-tian in the next half year of 2018, and the set of standards is expected to be implemented in this year.

This requires monitoring of exhaust emissions, and the concentration of particulate matter is one of the indicators. At present, no mass production sensor for detecting the concentration of the particulate matters in the tail gas exists in China, and most of sensors depend on import. According to partial user feedback, the stability and consistency of the SOOT of the imported exhaust gas particulate matter concentration sensor are not perfect. The high temperature of the exhaust gas is an important reason for influencing the measurement accuracy of the electronic device. An alternative method is to measure the particulate matter concentration by optical opacity, which is also specified in the sixth national standard, and the design is the basic principle. By adopting an optical measurement method, an important problem is how to prevent an optical element from being polluted, the temperature of tail gas can reach 580 ℃ at most, and electronic components need to be far away from a high-temperature area and cannot be in direct contact with the high-temperature area.

Therefore, in order to solve the above problems, a structure of an exhaust gas particulate matter concentration sensor is required.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention is directed to overcome the drawbacks of the prior art, and to provide a sensor structure for measuring exhaust gas particulate matter concentration, which can be used in high temperature areas and can prevent the optical element from being contaminated.

The utility model discloses a tail gas particulate matter concentration sensor structure, including gas production chamber, isolation chamber and optic fibre wire jumper, the gas production chamber is parallel to be run through in the blast pipe, the middle part of gas production chamber is excavated, the isolation chamber adorn respectively in the gas production chamber both ends, the isolation chamber front end with the gas production chamber is connected, the isolation chamber rear end with the optic fibre wire jumper passes through flange joint.

Preferably, the inner diameter of the isolation chamber is smaller than the inner diameter of the gas production chamber.

Preferably, the aperture of the connection between the flange and the isolation chamber is larger than the aperture of the connection between the flange and the optical fiber jumper.

Preferably, the optical fiber jumper selects protofilaments with glass-made claddings, so that the optical fiber can normally work in high-temperature occasions.

Preferably, the gas collecting chamber and the isolation chamber are made of stainless steel materials.

Preferably, the isolation chamber adopts a plurality of cascade connection modes to adapt to the use occasions with larger concentration of tail gas particulate matters and serious pollution conditions.

Preferably, the inner wall of the isolation chamber is increased in roughness and coated with a light absorbing material, so that the interference of the reflected light of the inner wall on the measurement result is reduced as much as possible.

Preferably, the aperture size of the front end of the isolation chamber is matched with the core size of the optical fiber jumper wire fiber to play a role of a diaphragm and filter the interference of stray light on a measurement result.

The utility model has the advantages that: the utility model discloses a tail gas particulate matter concentration sensing structure through at multistage dustproof isolating structure, prevents optical element's pollution to adopt optic fibre conduction sensing information, make electronic component keep away from the high temperature region.

Drawings

The invention will be further described with reference to the following figures and examples:

fig. 1 is a schematic structural view of the present invention;

reference numerals: 1. a gas collection chamber; 2. an isolation chamber; 3. a flange; 4. and (4) optical fiber jumpers.

Detailed Description

As shown in fig. 1, the exhaust gas particulate matter concentration sensing structure in this embodiment includes a gas collection chamber 1, an isolation chamber 2, and an optical fiber jumper 4, where the gas collection chamber 2 runs through an exhaust pipe in parallel. The middle part of the gas production chamber 1 is hollowed, the middle part is hollowed to facilitate tail gas circulation, and the hollowed area is limited in an exhaust pipe to prevent tail gas leakage; the isolation chambers 2 are respectively arranged at two ends of the gas production chamber 1 to prevent tail gas from polluting optical elements, the front end of the isolation chamber 2 is connected with the gas production chamber 1, and the rear end of the isolation chamber 2 is connected with the optical fiber jumper 4 through a flange 3.

The working principle is as follows: the optical fiber jumper 4 is used for transmitting and receiving light, the optical fiber jumper 4 at two ends forms a correlation structure, the light intensity received by the optical fiber jumper 4 carries the information of the concentration of the particulate matters, and the concentration of the particulate matters can be represented by the voltage information obtained through photoelectric conversion.

In this embodiment, the inner diameter of the isolation chamber 2 is smaller than the inner diameter of the gas collection chamber 1.

In this embodiment, the aperture of the flange 3 connected to the isolation chamber 2 is larger than the aperture of the flange 3 connected to the optical fiber jumper 4.

In this embodiment, optical fiber jumper 4 adopts big core footpath optical fiber jumper, and big core footpath optical fiber jumper chooses for use the covering for the use protofilament of glass material to ensure that optic fibre normally works under the high temperature occasion, and install the optic fibre focusing mirror additional behind big core footpath optical fiber jumper, can improve detectivity. The large-core-diameter optical fiber jumper is manufactured by adopting an optical fiber bundle method, the optical fiber bundle is formed by tightening and gluing a plurality of thin optical fibers, and the cost is saved on the premise of ensuring the end face coupling efficiency.

In this embodiment, the gas collection chamber 1 and the isolation chamber 2 are made of stainless steel, so as to ensure stable performance of the sensor in the high-temperature working situation of the exhaust funnel.

In this embodiment, the isolation chamber 2 adopts a plurality of cascade connection modes to enhance the isolation effect, that is, a plurality of single-stage isolation chambers 2 are connected in series to form a multi-stage isolation chamber, so as to adapt to the use occasions with larger concentration of particles in the tail gas and serious pollution conditions.

In this embodiment, the inner wall of the isolation chamber 2 has increased roughness and is coated with a light absorbing material, so as to reduce the interference of the reflected light from the inner wall to the measurement result as much as possible.

In this embodiment, the aperture size of the front end of the isolation chamber 2 is matched with the core size of the optical fiber jumper fiber 4 to play a role of a diaphragm and filter the interference of stray light on a measurement result.

Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.

Claims

1. The utility model provides an exhaust particulate matter concentration sensor structure which characterized in that: the gas production system comprises a gas production chamber, an isolation chamber and an optical fiber jumper wire, wherein the gas production chamber penetrates through an exhaust pipe in parallel, the middle of the gas production chamber is hollowed, the isolation chambers are respectively arranged at two ends of the gas production chamber, the front end of the isolation chamber is connected with the gas production chamber, and the rear end of the isolation chamber is connected with the optical fiber jumper wire through a flange.

2. The exhaust gas particulate matter concentration sensor structure according to claim 1, characterized in that: the inner diameter of the isolation chamber is smaller than that of the gas production chamber.

3. The exhaust gas particulate matter concentration sensor structure according to claim 1, characterized in that: the caliber of the flange connected with the isolation chamber is larger than the caliber of the flange connected with the optical fiber jumper.

4. The exhaust gas particulate matter concentration sensor structure according to claim 1, characterized in that: the optical fiber patch cord is made of glass coated protofilaments.

5. The exhaust gas particulate matter concentration sensor structure according to claim 1, characterized in that: the gas collecting chamber and the isolation chamber are made of stainless steel materials.

6. The exhaust gas particulate matter concentration sensor structure according to claim 1, characterized in that: the isolation chamber adopts a plurality of cascade structures.

7. The exhaust gas particulate matter concentration sensor structure according to claim 1, characterized in that: the inner wall of the isolation chamber is of a rough structure and is coated with a light absorption material.

8. The exhaust gas particulate matter concentration sensor structure according to claim 1, characterized in that: the aperture size of the front end of the isolation chamber is matched with the core size of the optical fiber jumper wire fiber.