CN215574622U - Absorption cell of gas analyzer - Google Patents

Abstract

The utility model discloses an absorption cell of a gas analyzer, which comprises a cell body, wherein the cell body is provided with a light inlet, a light outlet and a light beam channel for allowing light beams to enter from the light inlet and exit from the light outlet, and a light splitting ridge is arranged between at least two adjacent light beams in the light beam channel; the absorption cell of the gas analyzer has the advantages of longer optical path, higher resolution, higher sensitivity, good ultraviolet band response and strong anti-interference capability.

Description

Absorption cell of gas analyzer

Technical Field

The application relates to the field of gas monitoring equipment, in particular to an absorption cell of a gas analyzer.

Background

Note that the contents described in this section do not represent all the related art.

According to the national policy requirements of energy conservation and emission reduction, enterprises must realize ultralow emission and energy-saving transformation. Ultralow emission puts forward higher requirements on the sensitivity, detection limit and the like of an online monitoring gas analyzer, and the ultralow range gas analyzer which has smaller measurement range, higher measurement accuracy and easier maintenance is urgently needed.

According to the Beer-Lambert law, the optical path length is inversely related to the concentration. In order to improve the accuracy of the analyzer, the cuvette must be lengthened. In the current gas analyzer, in order to increase the length of the optical path in the absorption cell, a plurality of optical channels are generally disposed in the absorption cell. Interference (such as stray light) among the light channels can affect the analysis result to a certain extent, and the volume in the light channels is large, so that the response time is longer, and the volume of the analyzer is larger.

Disclosure of Invention

The utility model mainly aims at the problems, provides an absorption cell of a gas analyzer, and has the advantages of longer optical path, higher resolution, higher sensitivity, good ultraviolet band response and strong anti-interference capability.

In order to achieve the above object, the present invention provides an absorption cell of a gas analyzer, comprising a cell body, wherein the cell body is provided with a light inlet and a light outlet, and a light beam channel for allowing light beams to enter from the light inlet and exit from the light outlet, and a ridge is arranged between at least part of two adjacent light beams in the light beam channel.

Further, the watershed is substantially triangular.

Further, the pond body includes shell and the upper cover that sets up with the shell seal, the upper cover is in keeping away from one side of light inlet is provided with inlet port and venthole.

Furthermore, a plurality of reflector sets are arranged in the light beam channel and used for reflecting light beams incident from the light inlet to the light outlet for multiple times.

Furthermore, the reflector group comprises a plane mirror and a plane mirror base for installing the plane mirror, an adjusting groove is arranged in the light beam channel, and the plane mirror base is adjustably arranged on the adjusting groove through a bolt.

Furthermore, a light emitting source and a receiving source are arranged on the pool body, wherein the light emitting source is used for providing detection light beams to the light inlet, and the receiving source is used for receiving light rays emitted from the light outlet.

Furthermore, the light inlet and the light outlet are respectively provided with a convex lens, and an O-shaped ring is arranged between the pool body and the convex lens.

Furthermore, a retainer ring and a baffle plate are arranged between the convex lens and the luminous source; the receiving source comprises a convex lens, a fiber joint and a fiber flange.

Further, a decontamination hole is formed between the tank body and the baffle.

Further, the inner wall of the tank body is subjected to matt treatment.

Compared with the prior art, the absorption cell of the gas analyzer provided by the utility model has the advantages that the inner part is provided with the watershed, the inner volume is effectively reduced (the volume is 500-. The design of the watershed reduces the interference of each light channel, simultaneously reduces the interference caused by stray light, and improves the stability.

Drawings

Fig. 1 is a schematic view of a three-dimensional overall structure of an absorption cell of a gas analyzer.

FIG. 2 is a schematic view of the light direction in one embodiment.

Reference numerals shown in the drawings: 1. a housing; 2. an upper cover; 3. a light emitting source; 4. a plane mirror; 5. an O-shaped ring; 6. a retainer ring; 7. a convex lens; 8. a baffle plate; 9. a plane mirror base; 10. an optical fiber splice; 11. an optical fiber flange; 100. a tank body; 101. a light inlet; 102. a light outlet; 103. a light beam channel; 104. a light-splitting ridge; 105. an adjustment groove; 201. an air inlet; 202. an air outlet; 301. a first optical channel; 302. a second optical channel; 303. a third optical channel; 304. and a fourth optical channel.

Detailed Description

The present invention will be described in detail below with reference to the attached drawings, and the technical solutions in the embodiments of the present invention will be clearly and completely described. 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.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

According to an example of the present disclosure, as can be seen from the structure shown in fig. 1 as a whole and fig. 2 as a light ray tracing diagram, the absorption cell includes a cell body 100, the cell body 100 may include an outer casing 1 forming the appearance thereof and an upper cover 2 forming a sealing structure with the outer casing 1, a sealing ring is disposed between the outer casing 1 and the upper cover 2, and the outer casing 1 and the upper cover 2 are fixed by screws, so as to ensure the sealing performance of the inside, in this embodiment, the inner lens and the lens holder can be cleaned and maintained quickly and effectively by a detachable and open design, the outer casing 1 and the upper cover 2 may be formed by a single material or a combination of multiple materials, for example, the outer casing 1 and the upper cover 2 may include a non-metal material or a metal material, such as a plastic, aluminum, stainless steel, copper, or a combination thereof.

The composition of the housing 1 will be described in detail below with reference to specific examples.

Fig. 1-2 show schematic diagrams of the structure of a cell body 100 according to specific examples of the present disclosure. As shown in fig. 1-2, the housing 1 is formed by enclosing from the side and the bottom, and is provided with a light inlet 101 and a light outlet 102 at the same end, the housing 1 and the upper cover 2 are sealed to form a light beam channel 103 for receiving light beams entering from the light inlet 101 and exiting from the light outlet 102, and a light splitting ridge 104 is provided in the light beam channel 103 for separating two adjacent light beams, so as to reduce mutual interference between the light beams, reduce interference caused by stray light, and improve stability of the analyzer; in some implementations, the putting green 104 is substantially an equilateral triangle with rounded corners at the corners.

In the disclosed example, the cover plate of the upper cover 2 is penetrated with an air inlet hole 201 and an air outlet hole 202, the air inlet hole 201 and the air outlet hole 202 are arranged on the same side far away from the light inlet 101, namely, the same side far away from the light source, and the cooperation of the internal light-dividing ridge 104 can effectively reduce the pollution of the gas to the lens and prolong the service life of the instrument.

As shown in fig. 1, three mirror groups are disposed in the light beam channel 103, and are configured to reflect light beams incident through the light inlet 101 to the light outlet 102 for multiple times; it is specific, the speculum group all includes level crossing 4 and plane mirror seat 9, be provided with adjustment tank 105 in the light beam passageway 103, level crossing 4 passes through the adhesive to be fixed on plane mirror seat 9, the coating film layer is inboard towards, can effectively protect the coating film layer not corroded by gas, and the protection coating film that can be fine does not receive the damage in the clearance pollutant, plane mirror seat 9 assembly passes through the screw to be fixed respectively on adjustment tank 105, plane mirror seat 9 compares in other three-dimensional regulations with the installation position of light beam passageway 103, only need adjust the angle about in the two-dimensional plane, can be fast accurate adjust out required light, the work load that significantly reduces.

In the disclosed example, the cell body 100 is provided with a light emitting source 3 (the light emitting source 3 may be a spectrometer) and a receiving source (the receiving source includes an optical fiber connector 10 and an optical fiber flange 11), wherein the light emitting source 3 is used for providing a detection light beam to the light inlet 101, the receiving source is used for receiving light emitted from the light outlet 102, in this embodiment, two convex lenses 7 are respectively arranged at the light inlet 101 and the light outlet 102, and an O-ring 5 is arranged between the cell body 100 and the convex lenses 7, so that air tightness between the insides is ensured; a retainer ring 6 and a baffle plate 8 are arranged between the convex lens 7 and the luminous source 3, the retainer ring 6 and the baffle plate 8 are matched with each other to extrude the light inlet 101, the convex lens 7 and the O-shaped ring 5, and the O-shaped ring 5 are fixed on the pool body 100 through screws, so that the air tightness is further ensured; the light emitting source 3 is fixed by screws, and the light emitting source 3 is positioned at the focus of the convex lens 7. And in the light outlet 102 position, the fiber connector 10 and the fiber flange 11 are designed to be adjustable, the light spot size which can be controlled by adjusting the distance between the two improves the measurement accuracy, and during specific installation, the fiber flange 11 extrudes the light outlet 102, the convex lens 7 and the O-shaped ring 5 and is fixed on the pool body 100 through screws.

In some embodiments, a decontamination hole (not shown) is disposed between the cell body 100 and the baffle 8, so that under the condition that the light path is not damaged, contaminants on one side of the lamp can be effectively wiped off, the maintenance amount is reduced, and the service life of the instrument is prolonged.

In addition, all the machining parts in the embodiment can be subjected to internal stress removal treatment, so that the influence on the light transmission angle due to internal deformation is avoided, the stability is improved, preferably, no light treatment can be performed on the inner wall of the cell body 100, the interference caused by stray light can be reduced, and the measurement accuracy is improved; the protective layer on the surface can also reduce adsorption and prevent corrosion of the inner wall.

The working principle of the utility model is shown in fig. 2, light emitted by a light source 3 enters a first light channel 301 through a light inlet 101 and a convex lens 7, light beams are reflected three times in a second light channel 302, a third light channel 303 and a fourth light channel 304 through a plane mirror 4, and are finally reflected out of a light outlet 102 and the convex lens 7, and finally are led out of an absorption cell through optical fibers, and by adopting a design of three-fold four-light-channel, the detection optical path is longer under the condition that the size of the absorption cell is not changed, the total optical path can reach 1300 plus 1500mm, the detection lower limit can be effectively reduced, and the resolution is improved.

From a reading of the foregoing detailed description, it will be appreciated by those skilled in the art that the utility model can be readily implemented. It should be understood, however, that the intention is not to limit the utility model to the particular embodiments described. On the basis of the embodiments disclosed, a person skilled in the art can combine different features at will, so as to implement different solutions, and can combine different forms of additional functions to form other solutions. The scope of protection of the application is therefore only limited by the scope of the appended claims.

The present invention has been described in terms of specific examples, which are provided to aid understanding of the utility model and are not intended to be limiting. For a person skilled in the art to which the utility model pertains, several simple deductions, modifications or substitutions may be made according to the idea of the utility model.

Claims (10)

1. An absorption cell of a gas analyzer comprises a cell body, wherein the cell body is provided with a light inlet, a light outlet and a light beam channel for allowing light beams to enter from the light inlet and to exit from the light outlet, and is characterized in that a light splitting ridge is arranged between at least two adjacent light beams in the light beam channel.

2. The absorption cell of claim 1, wherein said watershed has a substantially triangular shape.

3. The absorption cell of the gas analyzer as claimed in claim 1, wherein the cell body comprises a housing and an upper cover hermetically disposed with the housing, and the upper cover is provided with an air inlet hole and an air outlet hole at a side away from the light inlet hole.

4. The absorption cell of claim 1, wherein a plurality of mirrors are disposed in the light beam path, and the mirrors are configured to reflect the light beam incident through the light inlet to the light outlet multiple times.

5. The absorption cell of the gas analyzer as claimed in claim 4, wherein the reflector set comprises a plane mirror and a plane mirror base for mounting the plane mirror, an adjustment groove is provided in the light beam channel, and the plane mirror base is adjustably mounted on the adjustment groove by a bolt.

6. The absorption cell of claim 1, wherein the cell body is provided with a light emitting source and a light receiving source, wherein the light emitting source is used for providing a detection light beam to the light inlet, and the light receiving source is used for receiving the light emitted from the light outlet.

7. The absorption cell of the gas analyzer as claimed in claim 6, wherein the light inlet and the light outlet are respectively provided with a convex lens, and an O-ring is arranged between the cell body and the convex lens.

8. The absorption cell of the gas analyzer as claimed in claim 7, wherein a retaining ring and a baffle are disposed between the convex lens and the light emitting source; the receiving source comprises a convex lens, a fiber joint and a fiber flange.

9. The absorption cell of a gas analyzer as defined in claim 8, wherein a decontamination hole is provided between the cell body and the baffle.

10. The absorption cell for a gas analyzer according to claim 1, wherein the inner wall of the cell body is matte-treated.

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