CN216361766U

CN216361766U - Probe of reciprocating type reflection light path

Info

Publication number: CN216361766U
Application number: CN202220527981.5U
Authority: CN
Inventors: 许可; 江荣平; 刘勘; 任伟
Original assignee: Langsi Sensing Technology Shenzhen Co ltd
Current assignee: Langsi Sensing Technology Shenzhen Co ltd
Priority date: 2022-03-11
Filing date: 2022-03-11
Publication date: 2022-04-22
Anticipated expiration: 2032-03-11

Abstract

The utility model discloses a probe of a reciprocating type reflection light path, which comprises a single-window fixing module, a front-end blowing gas ring cavity module, a filter screen sampling gas chamber, a rear-end blowing gas ring cavity module and a double-reflector fixing module which are sequentially connected together, wherein the single-window fixing module is connected with a light emitting end and a light receiving end through a heat insulation cavity module, the light emitting end and the light receiving end are arranged at one end far away from the front-end blowing gas ring cavity module, and the double-reflector fixing module comprises two plane reflectors which are symmetrically arranged in opposite directions. The probe of the reciprocating type reflection light path is convenient to install and maintain, more accurate in sampling result and wider in application range.

Description

Probe of reciprocating type reflection light path

Technical Field

The utility model relates to the technical field of smoke detection, in particular to a probe of a reciprocating type reflection light path.

Background

Nitrogen oxides are one of the main pollution sources causing atmospheric pollution, and not only can form photochemical smog and acid rain, but also can cause important damage to the respiratory system of a human body. NO and NO in nitrogen oxides₂Are important atmospheric pollutants. According to statistics, 70% of the discharge amount of nitrogen oxides in China comes from direct combustion of coal, and the power industry is a large coal-fired household in China, so that the main source of NOx discharge is thermal power plants, and pollution discharge generated by cement plants, garbage incineration and the like is realized. In order to prevent the pollution of the environment by excessive NOx generated after the combustion in the boiler, the denitration process is carried out, and the gas parameter NH in the denitration process₃And monitoring NOx in real time.

The common denitration monitoring method is extraction type sampling monitoring or direct monitoring by adopting a laser type monitoring device. At present, the laser monitoring device is generally a positioning monitoring device, i.e. the light emitting end and the light receiving end are located on the same straight line, and the two are installed at opposite positions, such as the installation method in patent CN 201822087080.5. However, the size of the flue is often very large, the installation coaxiality of the light emitting end and the light receiving end which are installed in a contraposition mode is difficult to guarantee, part of the chimney is in a special shape, the installation space is limited, the installation difficulty is greatly increased, the coaxiality is difficult to guarantee, and the instrument pipeline of the incident end and the instrument pipeline of the receiving end are arranged in a disconnecting mode and are easily influenced by the severe environment inside the flue.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a probe of a reciprocating type reflection optical path, which is convenient to install and maintain, more accurate in sampling result and wider in application range.

In order to achieve the purpose, the utility model provides the following technical scheme:

the utility model provides a reciprocating type probe of reflection light path, is including the fixed module of single window, front end sweeping gas ring chamber module, filter screen sampling air chamber, rear end sweeping gas ring chamber module and the fixed module of two mirrors that link together in proper order, the fixed module of single window is connected with light emission end and light receiving terminal through thermal-insulated chamber module, light emission end and light receiving terminal set up in keeping away from the one end of front end sweeping gas ring chamber module, the fixed module of two mirrors includes the plane reflection mirror that two opposite symmetry set up.

Optionally, the insulated cavity module is in communication with the front end purge gas ring cavity module and the back end purge gas ring cavity module via a capillary tube.

Optionally, the single window fixing module includes a window sheet disposed obliquely, and the window sheet is connected to the window sheet fixing base.

Optionally, a first mounting through hole is formed in the window piece fixing base, the window piece is arranged in the first mounting through hole, the window piece is fixed through a hollow compression screw, and a light passing through hole is formed in the hollow compression screw along the light transmission direction;

the window is characterized in that two sides of the window sheet are respectively provided with a first compression gasket, and the first compression gaskets are annular gaskets.

Optionally, the dual-reflector fixing module includes a dual-reflector fixing base, two second mounting through holes are provided on the dual-reflector fixing base, one planar reflector is provided in each second mounting through hole, and the two planar reflectors are symmetrically arranged about an axis of the probe.

Optionally, one side of the plane mirror is limited by the table top in the second mounting through hole, and the other side of the plane mirror is limited by the pressing cover plate;

a second compression gasket is arranged between the plane reflector and the table top, and a third compression gasket is arranged between the plane reflector and the compression cover plate; the second pressing gasket is an annular gasket.

Optionally, the heat insulation cavity module comprises a cooling unit and a purge gas supply unit, and the purge gas supply unit is communicated with the front-end purge gas ring cavity module and the rear-end purge gas ring cavity module through a capillary tube.

Optionally, the purge gas supply unit includes a purge seat body, a purge chamber is arranged in the purge seat body, and the purge chamber is communicated with one end of the capillary tube;

the purging cavity is communicated with an external purging gas path.

Optionally, the cooling unit comprises a heat insulation cavity air inlet pipe, the heat insulation cavity air inlet pipe is communicated with a heat insulation cavity main air chamber, and the heat insulation cavity main air chamber is connected with the single-window fixing module;

and the heat insulation cavity air inlet pipe is communicated with an external cooling air path.

Optionally, a first flange is fixedly connected to the heat insulation cavity air inlet pipe, a second flange is fixedly connected to the heat insulation cavity main air chamber, and a support ring is arranged at an end of the heat insulation cavity main air chamber, which is far away from the heat insulation cavity air inlet pipe.

Optionally, the front-end purge gas ring cavity module includes a first front-end purge gas sheet and a second front-end purge gas sheet, the first front-end purge gas sheet and the second front-end purge gas sheet are enclosed to form a first purge loop, the first purge loop is communicated with the purge cavity of the thermal insulation cavity module through a capillary, and an opening of the first purge loop faces the window sheet of the single-window fixed module.

Optionally, filter screen sampling air chamber includes the filter screen, the both ends fixedly connected with filter screen support section of thick bamboo of filter screen, the filter screen encloses into sampling air chamber.

Optionally, the rear-end purge gas ring cavity module includes a first rear-end purge gas sheet and a second rear-end purge gas sheet, the first rear-end purge gas sheet and the second rear-end purge gas sheet are enclosed to form a second purge loop, the second purge loop is communicated with the purge cavity of the thermal insulation cavity module through a capillary, and an opening of the second purge loop is disposed toward the plane mirror of the dual-reflector fixing module.

According to the technical scheme, the light emitting end and the light receiving end are arranged on the same side of the probe, and compared with the probe with the counterpoint structure in the prior art, the probe with the reciprocating type light path structure does not need to adjust the coaxiality of the light emitting end and the light receiving end, the actual measuring optical path of the probe is not limited by the diameter of a flue, only a filter screen sampling air chamber of the probe is inserted into a detection environment, the diameter of the flue does not influence the measuring result and the installation of the probe, the installation and the maintenance are convenient, the in-situ measurement can be realized, the sampling result is more accurate, and the application range is wider. The sampling analysis in the smoke environment is directly realized, and the result is more reliable.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that 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 according to the drawings without creative efforts.

Fig. 1 is an exploded view of a probe for a reciprocating reflective optical path according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a mounting structure of a probe for a reciprocating reflective optical path according to an embodiment of the present invention;

FIG. 3 is a schematic axial cross-sectional view of an angle of a probe of a reciprocating reflective optical path according to an embodiment of the present invention;

FIG. 4 is a partial enlarged view of the portion A in FIG. 3;

fig. 5 is a schematic structural diagram of a single-window fixing module according to an embodiment of the present invention;

FIG. 6 is a partial enlarged view of the portion B in FIG. 3;

FIG. 7 is an axial cross-sectional structural schematic view of an insulated chamber module provided in accordance with an embodiment of the present invention;

FIG. 8 is a schematic axial cross-sectional view of an alternate angle of a probe for a reciprocating reflective optical path according to an embodiment of the present invention;

FIG. 9 is a schematic cross-sectional view of a front purge gas ring cavity module according to an embodiment of the utility model;

FIG. 10 is a schematic cross-sectional view of a front purge gas ring module coupled to a capillary tube according to an embodiment of the utility model;

FIG. 11 is a schematic cross-sectional view of a back-end purge gas ring module and capillary connection provided in accordance with an embodiment of the utility model;

FIG. 12 is a schematic structural diagram of a filter screen sampling air chamber according to an embodiment of the present invention;

FIG. 13 is a schematic diagram of an optical path of a probe for reciprocating reflective optical paths according to an embodiment of the present invention;

fig. 14 is a schematic diagram of a reciprocating probe for reflecting an optical path mounted on a chimney wall according to an embodiment of the present invention.

Wherein:

1. a heat insulation cavity module 101, a first flange 102, a heat insulation cavity air inlet pipe 103, a blowing base body 1031, a blowing cavity 104, a heat insulation cavity main air chamber 105, a second flange 106, a support ring 107, an air inlet 108, an air outlet 109, a blowing air inlet 2, a single window fixing module 201, a window sheet fixing base 202, a hollow compression screw 2021, a light passing through hole 203, a first compression gasket 204, a window sheet 3, a front end blowing air ring cavity module 301, a first front end blowing air sheet 302, a second front end blowing air sheet 303, a first blowing loop circuit 4, a filter screen sampling air chamber 401, a filter screen 402, a filter screen support cylinder 5, a capillary tube 501, an opening 6, a rear end blowing air ring cavity module 601, a first rear end blowing air sheet 602, a second rear end blowing air sheet 603, a second blowing loop circuit 7, a double reflector fixing module, 701. the dual-reflector fixing base comprises a dual-reflector fixing base 702, a pressing cover plate 703, a third pressing gasket 704, a plane reflector 705, a second pressing gasket 8 and a chimney wall.

Detailed Description

The utility model discloses a reciprocating type probe for reflecting a light path, which is convenient to install and maintain, more accurate in sampling result and wider in application range.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 3, the probe for a reciprocating reflective optical path of the present invention includes a single window fixing module 2, a front end purge gas ring cavity module 3, a filter screen sampling gas chamber 4, a rear end purge gas ring cavity module 6, and a dual reflector fixing module 7, which are sequentially connected together, wherein the single window fixing module 2 is connected to a light emitting end and a light receiving end through a heat insulation cavity module 1, the light emitting end and the light receiving end are disposed at an end far from the front end purge gas ring cavity module 3, and the dual reflector fixing module 7 includes two plane reflectors 704 symmetrically disposed in opposite directions.

The single-window fixing module 2 is used for fixing the light-transmitting sheet, and the double-reflector fixing module 7 is used for fixing the reflector, it can be understood that, in order to reflect light, the light reflecting surfaces of the two plane reflectors 704 are arranged oppositely. The filter screen sampling air chamber 4 is used for collecting a gas sample in the chimney. Because the fixed module 2 of single window is close to the direct and chimney in gas contact of one side of chimney, the dust in the measuring environment is right easily the printing opacity piece causes serious pollution, consequently, adopts front end purge gas ring chamber module 3 to be used for right the printing opacity piece is close to one side of measuring environment and sweeps, avoids it has dust or other condensate to influence the measuring accuracy degree to fall on the printing opacity piece. Similarly, the rear-end purge gas ring cavity module 6 is used for purging one side of the reflector close to the measurement environment, so that the influence of dust or other condensate on the reflector on the measurement accuracy is avoided. The heat insulation cavity module 1 is used for realizing heat insulation of the probe and avoiding the influence of high temperature on the equipment at the light emitting end and the light receiving end.

The laser emitting device and the laser receiving device are positioned on the same side. Specifically, the laser emitting device is a laser, the laser receiving device is a detector, and both are devices commonly used in the existing flue gas detection technology, and the structure of the laser emitting device and the laser receiving device is not repeated herein. The laser emitting device is used for emitting detection laser, the detection laser penetrates through a detected environment and is subjected to photoelectric conversion by the laser receiving device, the sensing signal is sent back to the analysis component, the spectrum data is analyzed, and finally a measurement result is obtained. The front end of the utility model refers to one end close to the laser emission end, and the rear end refers to one end close to the flue. The light emitting end refers to a laser emitting end.

Compared with the probe with the counterpoint structure in the prior art, the probe with the reciprocating type reflection light path has the advantages that the coaxiality of the light emitting end and the light receiving end does not need to be adjusted, the actual measurement light path of the probe is not limited by the diameter of the flue, only the filter screen sampling air chamber 4 of the probe is inserted into a detection environment, the measurement result and the installation of the probe are not influenced by the diameter of the flue, the installation and the maintenance are convenient, the in-situ measurement can be realized, the sampling result is more accurate, and the application range is wider. The sampling analysis in the smoke environment is directly realized, and the result is more reliable. The in-situ measurement refers to a measurement mode that the light emitting end and the light receiving end are positioned on the same side.

Furthermore, the probe of the reciprocating type reflection light path also comprises a capillary tube 5, and a through hole extending along the axial direction is arranged in the capillary tube 5. The insulated chamber module 1 includes a purge gas supply unit which communicates with the front and back purge

gas ring modules

3 and 6 via capillary tubes 5. The purge gas supply unit is used for supplying purge gas for the front purge gas ring cavity module 3 and the rear purge gas ring cavity module 6.

In one embodiment, as shown in fig. 1, three capillaries 5 are provided, and three capillaries 5 are arranged in parallel and uniformly in order to increase the supply amount of purge gas.

Specifically, as shown in fig. 4 and 5, the single window fixing module 2 includes a window sheet 204 disposed obliquely, and the window sheet 204 is connected to the window sheet fixing base 201. One end of the window sheet fixing base 201 is fixedly connected with the heat insulation cavity module 1, and the other end is fixedly connected with the front end purge gas ring cavity module 3. The oblique arrangement means that the window piece 204 is neither arranged perpendicular to the axis of the probe nor parallel to the axis of the probe. Wherein, the angle between the window piece 204 and the cross section of the probe is alpha. The size of the angle alpha is adjusted by the skilled person as required. In one embodiment, the included angle α is 10 °. The window sheet 204 is inclined by 10 degrees, so that incident light cannot be perpendicular to the window sheet 204, damage to the laser caused by light reflection is avoided, meanwhile, light reflected by the plane reflector 704 at the tail end and stray light diffusely reflected by the inner wall of the tube are prevented from hitting the laser and the receiver to a certain extent due to the inclination of the lens, measuring signals are prevented from being influenced, and an interference prevention function is achieved.

In order to facilitate the installation of the window piece 204, a first installation through hole is formed in the window piece fixing base 201, the window piece 204 is arranged in the first installation through hole, and the window piece 204 is fixed in the first installation through hole through a hollow compression screw 202. In order to avoid affecting the propagation of the laser beam, the hollow compression screw 202 is provided with a light passing through hole 2021 along the light transmission direction. The axis of the clearance hole 2021 coincides with the axis of the probe. A hollow compression screw 202 is threaded into the first mounting through-hole. In order to seal and protect the window sheet 204, two sides of the window sheet 204 are respectively provided with a first pressing gasket 203, and the first pressing gaskets 203 are both annular gaskets. By using the annular spacer, the first pressing spacer 203 is prevented from affecting the laser transmission of the window piece 204.

It is to be understood that, in order to facilitate the installation of the capillary 5, the window sheet fixing base 201 is provided with a capillary via hole for the passage of the capillary 5.

Referring to fig. 6, the dual reflector fixing module 7 includes a dual reflector fixing base 701, two second mounting through holes are disposed on the dual reflector fixing base 701, a plane reflector 704 is disposed in each of the second mounting through holes, and the two plane reflectors 704 are symmetrically disposed about a plane where an axis of the probe is located.

Specifically, one side of the plane mirror 704 is limited by the mesa in the second mounting through hole, and the other side is limited by the pressing cover plate 702. In order to achieve sealing while protecting the flat mirror 704, a second compression gasket 705 is provided between the flat mirror 704 and the mesa, and a third compression gasket 703 is provided between the flat mirror 704 and the compression cover 702. The second pressing pad 705 is a ring-shaped pad so that the laser beam passes through and impinges on one of the plane mirrors 704, the beam impinging on this plane mirror 704 is reflected and directed to the other plane mirror 704, and the beam is reflected by the other plane mirror 704 and returned to the beam-receiving end. The third pressing pad 703 may be an annular pad or a circular pad.

When the flat mirror is installed, the second pressing pad 705 is firstly placed on the table top in the second installation through hole, the flat mirror 704 is then placed, the third pressing pad 703 is pressed on the side of the flat mirror 704 far away from the second pressing pad 705, and finally the pressing cover plate 702 is pressed on the third pressing pad 703. The hold-down cover 702 is attached to the two-mirror mounting base 701 by screws. The double-reflector fixed base 701 is fixedly connected with the rear-end purge gas ring cavity module 6, and the fixed connection can be a connecting piece or welding.

Further, the heat insulation chamber module 1 includes a temperature reduction unit and a purge gas supply unit. The purge gas supply unit communicates with the front purge gas ring module 3 and the back purge gas ring module 6 through a capillary tube 5. The purge gas supply unit provides purge gas, and the purge gas is conveyed to the corresponding purge gas ring cavity module position through the capillary 5, and the purge gas ring cavity module is used for purging the lens at the corresponding position, so that dust or condensate on the lens is avoided. The cooling unit is used for cooling, and the influence of high temperature to the equipment of light emission end and light receiving terminal is avoided.

Specifically, the purge gas supply unit includes a purge seat 103, a purge chamber 1031 is disposed in the purge seat 103, and the purge chamber 1031 is communicated with one end of the capillary 5, as shown in fig. 7 and 8, the purge seat 103 is an annular seat, and the middle position of the annular seat is a through hole structure, so as to avoid affecting irradiation and reflection of laser light. The purging chamber 1031 is an annular chamber disposed in the purging holder body 103, and for convenience of processing, one side of the purging chamber 1031 is an opening structure which is sealed by end faces of adjacent components. The purging chamber 1031 is communicated with an external purging gas circuit. The gas circuit that sweeps is the gas circuit that sweeps commonly used among the laser gas analysis device among the prior art, including sweeping gas intake pipe and air feeder, the one end of sweeping gas intake pipe with sweep the chamber 1031 intercommunication, the other end with air feeder intercommunication, no longer describe here any more. The purge gas may be nitrogen gas, or other common purge gases, which is not limited herein. The purging chamber 1031 is provided with a purging gas inlet 109, the purging gas inlet 109 is communicated with the inner cavity of the purging chamber 1031, and the purging gas inlet 109 is used for being connected with the purging gas inlet pipe. The purged gas is discharged through the filter mesh holes of the filter mesh sampling air chamber 4.

Further, referring to fig. 7 and 8, the cooling unit includes a heat insulation cavity air inlet pipe 102, the heat insulation cavity air inlet pipe 102 is communicated with a heat insulation cavity main air chamber 104, and the heat insulation cavity main air chamber 104 is connected with the single-window fixing module 2. The purging seat 103 is disposed between the insulating cavity air inlet pipe 102 and the insulating cavity main air chamber 104, and an end surface of the insulating cavity air inlet pipe 102 is used for sealing the opening structure of the purging chamber 1031. The heat insulation cavity air inlet pipe 102 is communicated with an external cooling air circuit, and the cooling air circuit is a cooling air circuit commonly used in the prior art and specifically comprises a cooling air inlet pipe, a cooling air device and a cooling air outlet pipe. The heat insulation cavity air inlet pipe 102 is provided with an air inlet 107 and an air outlet 108, and the air inlet 107 and the air outlet 108 are both communicated with the inner cavity of the heat insulation cavity air inlet pipe 102. The air inlet 107 is used for being connected with the cooling air inlet pipe, and the air outlet 108 is used for being connected with the cooling air outlet pipe. The inlet air of the air inlet 107 and the outlet air of the air outlet 108 form flowing cooling air flow, and the heat insulation cavity air inlet pipe 102 brings the temperature transferred by the heat insulation cavity main air chamber 104 on the probe out of the cavity in time through the flowing air flow.

In order to facilitate connection of a laser emitting or receiving device, a first flange 101 is fixedly connected to the heat insulation cavity air inlet pipe 102, and the first flange 101 is fixedly connected to the end portion of the heat insulation cavity air inlet pipe 102. And a second flange 105 is fixedly connected to the main air chamber 104 of the heat insulation cavity, and the second flange 105 is used for being connected with a connecting flange on the chimney wall 8, so that the probe is installed on the chimney wall 8. The end of the main air chamber 104 of the insulating cavity far away from the air inlet pipe 102 of the insulating cavity is provided with a support ring 106, and the support ring 106 is used for supporting the capillary 5 and preventing the capillary 5 from collapsing and interfering with the light path due to over-thinness. The support ring 106 is welded to the window piece fixing base 201 after being connected to the window piece fixing base 201 by the positioning pins.

In a specific embodiment, the front purge gas ring cavity module 3 includes a first front purge gas sheet 301 and a second front purge gas sheet 302 connected together, and the first front purge gas sheet 301 and the second front purge gas sheet 302 are both ring-shaped structures to facilitate the passage of the detection light, as shown in fig. 9 and 10. The first front purge gas patch 301 and the second front purge gas patch 302 enclose a first purge loop 303, and the first purge loop 303 communicates with the purge chamber 1031 through an opening 501 in the capillary tube 5. To improve the purging effect and the cleanliness, the opening of the first purge loop 303 is disposed toward the window plate 204 of the single window fixed module 2 so that the purge gas is directly blown on the window plate 204. The first front purge gas patch 301 and the second front purge gas patch 302 are welded together. The window sheet fixing base 201 is fixedly connected with the first front end purging air sheet 301, and the second front end purging air sheet 302 is fixedly connected with the filter screen sampling air chamber 4, where the fixing connection may be welding.

Further, as shown in fig. 11, the back-end purge gas ring cavity module 6 includes a first back-end purge gas sheet 601 and a second back-end purge gas sheet 602, which are connected together, and both the first back-end purge gas sheet 601 and the second back-end purge gas sheet 602 are of an annular structure, so as to facilitate the passage of detection light. The first aft end purge gas piece 601 and the second aft end purge gas piece 602 may be welded together. The first back end purge gas patch 601 and the second back end purge gas patch 602 are enclosed as a second purge loop 603, the second purge loop 603 is in communication with the end of the capillary tube 5, and the second purge loop 603 is in communication with the purge chamber 1031 through the capillary tube 5. The opening of the second purge loop 603 is disposed toward the flat mirror 704 of the two-mirror fixed module 7 so that the purge gas is directly purged onto the flat mirror 704.

Specifically, as shown in fig. 12, the filter screen sampling air chamber 4 includes a filter screen 401, two ends of the filter screen 401 are fixedly connected with filter screen supporting cylinders 402, and the filter screen 401 surrounds into a cylindrical shape to form a sampling air chamber cavity. The screen 401 is a stainless steel screen. Wherein, the mesh of the filter screen 401 can filter out sundries in non-measuring range. In one embodiment, the mesh of the filter 401 is 2 μm to 10 μm, which can filter out particles with a size larger than 10 μm, and ensure that the gas flowing through the measurement is not affected by other impurity mixture. The stainless steel filter screen has strong corrosion resistance. The screen 401 is welded to the screen support cylinder 402 at both ends. One end and the front end purge gas ring chamber module 3 fixed connection of filter screen sampling air chamber 4, the other end and rear end purge gas ring chamber module 6 fixed connection, it is specific, and the filter screen of front end supports a section of thick bamboo 402 and welds with front end purge gas ring chamber module 3, and the filter screen of rear end supports a section of thick bamboo 402 and welds with rear end purge gas ring chamber module 6. The back end purge gas ring chamber module 6 is disposed on the inner wall of the screen support cylinder 402 at the back end.

The first pressing gasket 203, the second pressing gasket 705 and the third pressing gasket 703 all have high temperature resistance.

Specifically, the angle between the two plane mirrors 704 is 90 °. Through above-mentioned structural setting for the light of incident and the light of reflection back are parallel light, and the later stage if the length of probe needs to be changed, can not produce great influence to light path, otherwise need readjust the incident angle of light, or change the tubular construction.

In use, as shown in fig. 14, the probe of the present invention is inserted into a flue duct for practical use, and the second flange 105 is fixedly connected to the connecting flange on the chimney wall 8 by bolts. The flue gas (containing the mixture of particles and the like) in the flue flows in the same direction, and when passing through the filter screen 401, the filter screen 401 filters impurities in a non-measuring range, so that the impurities in the non-measuring range are prevented from entering the filter screen sampling air chamber 4. Meanwhile, the infrared light source enters from the air inlet pipe 102 of the heat insulation cavity, passes through the main air chamber 104 of the heat insulation cavity and then irradiates on the inclined window piece 204. Then the light path enters the filter screen sampling air chamber 4, and is absorbed by the gas to be measured to generate a reaction, the light path is emitted on one plane reflector 704, reflected on the other plane reflector 704 and then reflected out, finally the light path is reflected back to the direction of the incident end, and is received by a detector for signal processing, and the specific light path trend is shown in fig. 13.

The probe of the reciprocating type reflection light path ensures that the incident end and the receiving end are positioned at the same side, is convenient for field installation and debugging, and ensures the performance stability of the probe because the internal structure is made of materials used in severe environment. The reciprocating type probe for reflecting the light path has the advantages that the actual measuring light path is not limited by the diameter of the flue, the requirements of field installation and maintenance on technical personnel are low, in-situ measurement can be realized, sampling in an extraction mode is not needed, direct detection is realized in the field environment, and the detection accuracy is higher.

In the description of the present solution, it is to be understood that the terms "upper", "lower", "vertical", "inside", "outside", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present solution.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides a probe of reciprocating type reflection light path, its characterized in that, is including single window fixed module (2), front end sweeping gas ring chamber module (3), filter screen sampling air chamber (4), rear end sweeping gas ring chamber module (6) and the fixed module of two mirrors (7) that link together in proper order, single window fixed module (2) are connected with light emission end and light receiving terminal through thermal-insulated chamber module (1), light emission end and light receiving terminal set up in keeping away from the one end of front end sweeping gas ring chamber module (3), the fixed module of two mirrors (7) include two plane reflection mirror (704) that the symmetry set up in opposite directions.

2. The probe of claim 1, wherein the thermally insulated chamber module (1) communicates with the front purge gas ring module (3) and the back purge gas ring module (6) via a capillary tube (5).

3. The probe of claim 1, wherein the single window fixing module (2) comprises a window sheet (204) disposed obliquely, and the window sheet (204) is connected to the window sheet fixing base (201).

4. The probe of the reciprocating type reflection optical path according to claim 3, wherein a first mounting through hole is formed on the window piece fixing base (201), the window piece (204) is arranged in the first mounting through hole, the window piece (204) is fixed by a hollow compression screw (202), and a light passing through hole (2021) is formed on the hollow compression screw (202) along the light transmission direction;

two sides of the window sheet (204) are respectively provided with a first pressing gasket (203), and the first pressing gaskets (203) are annular gaskets.

5. The probe of claim 1, wherein said two-mirror fixing module (7) comprises a two-mirror fixing base (701), two second mounting through holes are provided on said two-mirror fixing base (701), one of said planar mirrors (704) is provided in each of said second mounting through holes, and two of said planar mirrors (704) are symmetrically provided about an axis of the probe.

6. The probe of claim 5, wherein one side of said planar mirror (704) is retained by a mesa within said second mounting through hole and the other side is retained by a hold-down cover plate (702);

a second compression gasket (705) is arranged between the plane reflector (704) and the table top, and a third compression gasket (703) is arranged between the plane reflector (704) and the compression cover plate (702); the second compression gasket (705) is an annular gasket.

7. The probe of the reciprocating reflective optical path according to claim 1, wherein the thermal insulation chamber module (1) comprises a temperature reduction unit and a purge gas supply unit, and the purge gas supply unit is communicated with the front end purge gas ring chamber module (3) and the rear end purge gas ring chamber module (6) through a capillary tube (5).

8. The probe of the reciprocating type reflection optical path according to claim 7, wherein the purge gas supply unit comprises a purge holder (103), a purge chamber (1031) is provided in the purge holder (103), and the purge chamber (1031) is communicated with one end of the capillary tube (5);

the purging chamber (1031) is communicated with an external purging gas circuit.

9. The probe of the reciprocating type reflection light path according to claim 7, wherein the cooling unit comprises a heat insulation cavity air inlet pipe (102), the heat insulation cavity air inlet pipe (102) is communicated with a heat insulation cavity main air chamber (104), and the heat insulation cavity main air chamber (104) is connected with the single window fixing module (2);

the heat insulation cavity air inlet pipe (102) is communicated with an external cooling air path.

10. The probe for the reciprocating type reflection of light path according to claim 9, characterized in that a first flange (101) is fixedly connected to the heat insulation cavity air inlet pipe (102), a second flange (105) is fixedly connected to the heat insulation cavity main air chamber (104), and a support ring (106) is arranged at the end of the heat insulation cavity main air chamber (104) far away from the heat insulation cavity air inlet pipe (102).

11. The probe of the reciprocating type reflection optical path according to claim 1, wherein the front end purge gas loop module (3) comprises a first front end purge gas sheet (301) and a second front end purge gas sheet (302), the first front end purge gas sheet (301) and the second front end purge gas sheet (302) are enclosed into a first purge loop (303), the first purge loop (303) is communicated with the purge chamber (1031) of the thermal insulation cavity module (1) through a capillary tube (5), and an opening of the first purge loop (303) is arranged towards the window sheet (204) of the single window fixing module (2).

12. The probe of claim 1, wherein the filter screen sampling air chamber (4) comprises a filter screen (401), a filter screen support cylinder (402) is fixedly connected to both ends of the filter screen (401), and the filter screen (401) is enclosed into a sampling air chamber cavity.

13. The probe of the reciprocating type reflection optical path according to claim 1, wherein the back end purge gas ring module (6) comprises a first back end purge gas sheet (601) and a second back end purge gas sheet (602), the first back end purge gas sheet (601) and the second back end purge gas sheet (602) are enclosed to form a second purge loop (603), the second purge loop (603) is communicated with the purge chamber (1031) of the thermal insulation chamber module (1) through a capillary tube (5), and an opening of the second purge loop (603) is arranged towards the plane mirror (704) of the double-mirror fixing module (7).