CN220019369U - Gas measurement air chamber with double wedge-shaped convex lenses and measuring instrument thereof - Google Patents
Gas measurement air chamber with double wedge-shaped convex lenses and measuring instrument thereof Download PDFInfo
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- CN220019369U CN220019369U CN202321201390.XU CN202321201390U CN220019369U CN 220019369 U CN220019369 U CN 220019369U CN 202321201390 U CN202321201390 U CN 202321201390U CN 220019369 U CN220019369 U CN 220019369U
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- inner tube
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- convex lens
- optical fiber
- wedge
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- 238000005259 measurement Methods 0.000 title claims abstract description 14
- 239000013307 optical fiber Substances 0.000 claims abstract description 36
- 230000003287 optical effect Effects 0.000 claims abstract description 24
- 238000009413 insulation Methods 0.000 claims abstract description 9
- 239000000835 fiber Substances 0.000 claims description 10
- 239000011521 glass Substances 0.000 claims description 10
- 239000000779 smoke Substances 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 4
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims 4
- 235000017491 Bambusa tulda Nutrition 0.000 claims 4
- 241001330002 Bambuseae Species 0.000 claims 4
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims 4
- 239000011425 bamboo Substances 0.000 claims 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 14
- 239000003546 flue gas Substances 0.000 abstract description 14
- 239000007789 gas Substances 0.000 abstract description 10
- 238000001514 detection method Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 10
- 238000005070 sampling Methods 0.000 description 8
- 230000001681 protective effect Effects 0.000 description 7
- 238000009833 condensation Methods 0.000 description 6
- 230000005494 condensation Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 238000012423 maintenance Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000007547 defect Effects 0.000 description 5
- 239000006059 cover glass Substances 0.000 description 3
- 230000002572 peristaltic effect Effects 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 229910052724 xenon Inorganic materials 0.000 description 2
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000007791 dehumidification Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The utility model relates to the technical field of flue gas detection, in particular to a gas measurement air chamber with double-wedge convex lenses and a measuring instrument thereof, which comprises a vacuum heat insulation tube, an inner tube arranged in the vacuum heat insulation tube, an inner tube front end flange and an inner tube rear end flange welded at two ends of the inner tube, wherein a pyramid prism is arranged in the inner tube front end flange, one side of the inner tube rear end flange is connected with a Y-shaped optical fiber, the double-wedge convex lenses are arranged in the inner tube rear end flange, each double-wedge convex lens is a lens with one spherical surface side and one thick middle and two thin sides, the transmitting optical fiber and the receiving optical fiber of the Y-shaped optical fiber are symmetrical relative to the main optical axis of the double-wedge convex lenses, the main optical axis of the double-wedge convex lenses is coaxial with the main optical axis of the pyramid prism, and the end part of the Y-shaped optical fiber is positioned in the focal plane of the double-wedge convex lenses. The position of the light returned to the receiving optical fiber by the air chamber is determined by the parameters of the optical parts, is basically not affected by assembly, has low assembly difficulty and has high stability.
Description
Technical Field
The utility model relates to the technical field of flue gas detection, in particular to a gas measurement air chamber with double wedge-shaped convex lenses and a measurement instrument thereof.
Background
At present, SO in flue gas needs to be measured in flue gas emission monitoring 2 、NO、NO 2 And the concentration of the pollutants can be measured by an ultraviolet absorption method. The concentration of pollutants in flue gas is measured by a common ultraviolet absorption method, namely a hot wet method and a cold dry method. Wherein the hot wet method does not need dehumidification, and can avoid SO in the condensation process 2 、NH 3 The components which are easy to dissolve in water are dissolved and lost, and the air chamber can be arranged in the sampling tube, so that the structure of integrating the sampling tube and the host is designed, and the portable smoke analyzer is convenient to carry, and is more suitable for portable smoke analysis. However, in the method of measuring the smoke components by the hot wet method, the air chamber is often in the process of repeatedly and alternately changing from the ambient temperature to over 120 ℃, and the requirement of high stability is provided for the stability of the light path of the air chamber. The air chamber structure of the current hot wet flue gas analyzer generally has the defect of poor stability, the optical signal received by the photoelectric sensor is influenced by the air chamber structure to a large extent, when the air chamber structure is slightly deformed, the received optical energy is greatly changed, the reliability of the hot wet flue gas measurement mode is seriously influenced, the air chamber is positioned in a sampling tube, the defect of high difficulty in maintenance process also exists, and after the air chamber is detached from the sampling tube, the air chamber can be wiped and maintained, and the light path is required to be readjusted after the completion. Therefore, the current hot wet flue gas analyzer has the defects of short maintenance period and high maintenance difficulty.
Chinese patent No.: 201921429975.0, patent name: the scheme of using the wedge-shaped mirror and the right angle pyramid in the patent turns the light path, and the defect is that the pyramid component needs to be adjusted to a fixed angle to sample proper light intensity, and the pyramid needs to be rotated to an original angle after each debugging, so that the maintenance difficulty is increased; the optical surface is increased and the light intensity collection efficiency is reduced.
Chinese patent No.: 201921429518.1, patent name: the patent of the high-stability gas measurement air chamber and the measuring instrument thereof uses a non-right angle pyramid rotary light path, wherein the defect is that the pyramid needs to be adjusted to a fixed angle to sample proper light intensity, and the pyramid needs to be rotated to an original angle after each debugging, so that the maintenance difficulty is increased.
Disclosure of Invention
The utility model aims to provide a gas measurement air chamber with double wedge-shaped convex lenses and a measuring instrument thereof, which are used for solving the problems of unstable optical path system and difficult debugging of the existing hot wet flue gas analyzer.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
the utility model relates to a gas measurement gas chamber with double wedge-shaped convex lenses, which comprises a vacuum heat insulation pipe and an inner pipe arranged in the vacuum heat insulation pipe, wherein an inner pipe front end flange and an inner pipe rear end flange are welded at two ends of the inner pipe, a pyramid prism is arranged in the inner pipe front end flange, one side of the inner pipe rear end flange is connected with a Y-shaped optical fiber, and the utility model further improves the following steps on the basis of the prior art: a double-wedge-shaped convex lens is arranged in the flange at the rear end of the inner tube, the double-wedge-shaped convex lens is a lens with one side being a sphere and one side being a wedge-shaped surface with the middle thick and the two thin sides, the emitting optical fiber and the receiving optical fiber of the Y-shaped optical fiber are symmetrical about the main optical axis of the double-wedge-shaped convex lens, the main optical axis of the double-wedge-shaped convex lens is coaxial with the main optical axis of the pyramid prism, and the end part of the Y-shaped optical fiber is positioned in the focal plane of the double-wedge-shaped convex lens.
Preferably, the device further comprises a pyramid prism component, wherein the pyramid prism component is arranged inside the flange at the front end of the inner tube and comprises a fixed cylinder, a cylinder cover, a rubber mat and protective glass, the rubber mat is arranged in the cylinder cover, the cylinder cover is connected with the fixed cylinder, the pyramid prism is arranged in the fixed cylinder, one end of a reflecting surface is propped against the rubber mat, the incident surface of the pyramid prism is closely adjacent to the protective glass, and the protective glass is arranged at the bottom of the fixed cylinder.
Preferably, the other end of the inner pipe front end flange is welded with the outer pipe front end flange.
Preferably, the flue gas filter further comprises a primary filter element and a secondary filter element for filtering flue gas, wherein the secondary filter element is arranged in the flange at the front end of the inner tube, and the primary filter element is arranged in the flange at the front end of the outer tube in close proximity to the secondary filter element.
Preferably, the filter element pressing cap is further included, and the filter element pressing cap is fixed with the front end flange of the outer tube and supports the primary filter element and the secondary filter element.
Preferably, the double wedge convex lens is fixed by a lens fixing cylinder at the rear end flange of the inner tube.
Preferably, the optical fiber connector also comprises an optical fiber connector, wherein one end of the optical fiber connector is sleeved outside the lens fixing cylinder, and the other end of the optical fiber connector extends out of the vacuum heat insulation pipe to be connected with the Y-shaped optical fiber.
Preferably, the device further comprises an air outlet nozzle which is fixed on the flange at the rear end of the inner tube and communicated with the inner part of the inner tube.
Preferably, an air guide groove is formed in the inner wall of the flange at the front end of the inner tube, and the air guide groove is communicated with the inner portion of the inner tube.
The utility model also provides a measuring instrument, which is provided with the air chamber.
Compared with the prior art, the utility model has the beneficial effects that:
the position of the light returned to the receiving optical fiber is determined by the parameters of the optical part, is basically not affected by assembly, has low assembly difficulty and high stability;
after the parameters of the Y-shaped optical fiber and the double-wedge-shaped convex lens are determined, the optical path can be changed by changing the distance from the pyramid prism to the double-wedge-shaped convex lens, other parameters are not required to be adjusted, and the universality is strong.
Drawings
FIG. 1 is a schematic diagram of a gas cell with a double wedge convex lens according to the present utility model;
FIG. 2 is a schematic view of the optical path of a gas cell with a double wedge convex lens according to the present utility model;
FIG. 3 is a block diagram of a double wedge convex lens of the present utility model;
FIG. 4 is a block diagram of the front flange of the inner tube of the present utility model;
FIG. 5 is a block diagram of the rear end flange of the inner tube of the present utility model;
FIG. 6 is an external block diagram of the meter of the present utility model;
fig. 7 is a diagram showing the internal structure of the main chassis of the measuring instrument of the present utility model.
The vacuum heat insulation tube 1, the inner tube 2, the inner tube front end flange 3, the inner tube rear end flange 4, the pyramid prism 5, the Y-shaped optical fiber 6, the transmitting optical fiber 61, the receiving optical fiber 62, the double wedge convex lens 7, the fixed cylinder 8, the cylinder cover 9, the rubber pad 10, the protective glass 11, the outer tube front end flange 12, the primary filter element 13, the secondary filter element 14, the filter element press cap 15, the lens fixed cylinder 16, the optical fiber joint 17, the air outlet nozzle 18, the first O-shaped ring 19, the second O-shaped ring 20, the third O-shaped ring 21, the primary filter element rubber pad 22, the rubber ring 23, the mainframe box 24, the air chamber transfer tube 25, the sampling pump 26, the spectrometer 27, the industrial personal computer 28, the pulse xenon lamp 29, the electrochemical sensor component 30, the peristaltic pump 31, the condensation dewatering component 32 and the lower computer circuit board 33.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1 and 3, the present utility model provides a technical solution:
the utility model provides a gas measurement air chamber with double wedge face convex lens, includes vacuum heat insulating tube 1, sets up at the inside inner tube 2 of vacuum heat insulating tube 1, inner tube front end flange 3, inner tube rear end flange 4 of inner tube 2 both ends welding, installs pyramid prism 5 in the inner tube front end flange 3, Y type optic fibre 6 is connected to inner tube rear end flange 4 one side, install double wedge face convex lens 7 in the inner tube rear end flange 3, double wedge face convex lens 7 is a lens that one side is the sphere, one side is the thick wedge face in both sides thin in centre, the transmission optic fibre 61 and the receiving optic fibre 62 of Y type optic fibre 6 are symmetrical about double wedge face convex lens 7 main optical axis, the main optical axis of double wedge face convex lens 7 is coaxial with the main optical axis of pyramid prism 5, the tip of Y type optic fibre 6 is located double wedge face convex lens 7's focal plane. The inner pipe front end flange 3 is shown in fig. 4, the inner pipe front end flange 3 is provided with an air guide groove 31, the inner pipe rear end flange 4 is shown in fig. 5, and the inner pipe rear end flange 4 is provided with a set screw hole 41 and an air outlet hole 42. The distance between the cores of the emitting fiber 61 and the receiving fiber 62 of the Y-shaped optical fiber 6 of the present embodiment is 0.4mm, and thus the distance between the optical axes of the double wedge convex lens 7 is also 0.4mm.
Referring to fig. 3, the front surface of the double wedge convex lens 7 is a double wedge mirror surface with a thick middle and thin two sides, and the rear surface is a convex sphere, when the light emitted by one light source is incident on one wedge surface, the light source is equivalent to deflection towards the thin side of the surface due to refraction effect. As shown in fig. 2, the light emitted from the end of the emission optical fiber 61 at the lower part is incident on the wedge surface at the upper part of the double wedge convex lens 7 and then emitted through the convex spherical surface. The end of the Y-shaped optical fiber 6 is located at the focal plane of the double-wedge convex lens 7, and if the double-wedge is a plane, the outgoing light from the convex lens is slightly deflected to the upper direction, and the wedge has a refractive effect, so that the light beam is slightly refracted downward, and the outgoing light beam from the lens is made to exit parallel to the main optical axis.
The parallel light emitted from the double wedge convex lens 7 is incident on the upper half of the pyramid prism 5, and then is inverted by 180 ° and emitted from the lower half of the pyramid prism 5. The light beam returned by the corner cube 5 parallel to the main optical axis is converged by the double wedge convex lens 7 and exits from the lower wedge, if there is no wedge, the light will converge on the main optical axis of the convex lens, and the light spot will be deflected upwards due to the wedge, just into the end of the receiving fiber 62.
As a preferred implementation manner of this embodiment, the device further comprises a pyramid prism component, wherein the pyramid prism component is arranged inside the inner tube front end flange 3 and comprises a fixed cylinder 8, a cylinder cover 9, a rubber pad 10 and protective glass 11, the rubber pad 10 is arranged in the cylinder cover 9, the cylinder cover 9 is connected with the fixed cylinder 8, the pyramid prism 5 is arranged in the fixed cylinder 8, one end of a reflecting surface is propped against the rubber pad 10, the incident surface of the pyramid prism 5 is closely adjacent to the protective glass 11, and the protective glass 11 is arranged at the bottom of the fixed cylinder 8.
Further in order to increase the air tightness of the pyramid prism assembly, the cylinder cover 9 is sleeved with a first O-shaped ring 19, so that the cylinder cover 9 and the fixed cylinder 8 are tightly combined. In order to protect the corner cube 5 and the cover glass 11, a second O-ring 20 and a third O-ring 21 are provided on the contact surface of the corner cube 5 and the cover glass 11 and the contact surface of the cover glass 11 and the fixing tube 8, respectively.
The other end of the inner pipe front end flange 3 of the air chamber of the embodiment is welded with the outer pipe front end flange 12. In order to ensure that the flue gas is effectively filtered and the measurement accuracy is ensured, as a preferred implementation manner of the embodiment, the flue gas filter further comprises a primary filter element 13 and a secondary filter element 14 for filtering the flue gas, wherein the secondary filter element 14 is arranged in the inner pipe front end flange 3, and the primary filter element 13 is arranged in the outer pipe front end flange 12 in close proximity to the secondary filter element 14. The primary filter element 11 is a stainless steel sintered filter element, and the secondary filter 12 is a polytetrafluoroethylene filter element.
In order to facilitate the disassembly of the primary filter element 11 and the secondary filter element 12, as a preferred implementation of the embodiment, the filter element pressing cap 15 is further included, and the filter element pressing cap 15 is fixed with the outer tube front end flange 12 against the primary filter element 13 and the secondary filter element 14. In order to increase the air tightness of the air chamber, a first-stage filter element rubber pad 22 can be arranged between the first-stage filter element 11 and the filter element pressing cap 15. When the pyramid prism 5 needs maintenance, only the filter element pressing cap 15 needs to be detached, the primary filter element 11 and the secondary filter element 12 are taken out, and the whole air chamber does not need to be detached.
In the present embodiment, the collimating lens 5 is fixed by the lens fixing cylinder 16 at the rear end flange 4 of the inner tube. The optical fiber connector 17 is sleeved outside the lens fixing cylinder 16 at one end, and one end of the optical fiber connector 17 extends out of the vacuum heat insulation tube 1 to be connected with the Y-shaped optical fiber 6. The air outlet nozzle 18 is fixed on the inner pipe rear end flange 4, and the air outlet nozzle 17 is communicated with the air outlet hole 42 of the inner pipe rear end flange 4. The fiber optic connector 16 is secured by a set screw passing through set screw hole 41 in inner tube rear end flange 4. The inner tube rear end flange 4 is sleeved with a rubber ring 23.
An air guide groove 31 is formed in the inner wall of the inner pipe front end flange 3, and the air guide groove 31 is communicated with the inner part of the inner pipe 2.
Referring to fig. 6 and 7, the present embodiment further provides a measuring instrument, the measuring instrument has a main chassis 24, an air chamber transfer tube 25 is installed on the main chassis 24, the air chamber transfer tube 25 is connected with the air chamber of the present embodiment, and a handle, a display screen, a power interface and a data interface are disposed on the main chassis 24. The inside of the main case 24 is provided with a sampling pump 26, a spectrometer 27, an industrial personal computer 28, a pulse xenon lamp 29, an electrochemical sensor assembly 30, a peristaltic pump 31, a condensation water removal assembly 32 and a lower computer circuit board 33. Other structures outside the measuring instrument degassing chamber are all in the prior art, and the connection relation is not repeated.
When the measuring instrument of the embodiment works, the sampling pump 26 works, so that smoke enters the inner tube 2 from the air guide groove 31 of the front end flange 3 of the inner tube after two-stage filtration of the filter element press cap 15 at the end part of the air chamber through the first-stage filter element 11 and the second-stage filter element 12, the air chamber is discharged from the air outlet nozzle 18 through the air outlet hole 42 of the rear end flange 4 of the inner tube, the air outlet nozzle 18 is connected with the condensation water removing component 32 in the main machine box 24 through a hose, the condensation water generated by the condensation water removing component 32 enters the peristaltic pump 31 through the hose and is discharged, and the smoke after water removal enters the sampling pump and then enters the electrochemical sensor component 30 through the hose and is finally discharged through the air guide pipe communicated with the electrochemical sensor component 30.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The utility model provides a gas measurement air chamber with double wedge face convex lens, includes the vacuum thermal-insulated pipe, sets up at the inside inner tube of vacuum thermal-insulated pipe, inner tube both ends welded inner tube front end flange, inner tube rear end flange, installs the pyramid prism in the inner tube front end flange, Y type optic fibre is connected to inner tube rear end flange one side, its characterized in that: a double-wedge-shaped convex lens is arranged in the flange at the rear end of the inner tube, the double-wedge-shaped convex lens is a lens with one side being a sphere and one side being a wedge-shaped surface with the middle thick and the two thin sides, the emitting optical fiber and the receiving optical fiber of the Y-shaped optical fiber are symmetrical about the main optical axis of the double-wedge-shaped convex lens, the main optical axis of the double-wedge-shaped convex lens is coaxial with the main optical axis of the pyramid prism, and the end part of the Y-shaped optical fiber is positioned in the focal plane of the double-wedge-shaped convex lens.
2. The gas cell for gas measurement of a double wedge convex lens according to claim 1, wherein: still include pyramid prism subassembly, pyramid prism subassembly sets up inside the inner tube front end flange, including fixed section of thick bamboo, cover, cushion, protection glass, the cushion sets up in the cover, the cover is connected and is fixed the section of thick bamboo, pyramid prism sets up in fixed section of thick bamboo, and the cushion is withstood to reflecting surface one end, pyramid prism's incident surface next-door neighbour protection glass, protection glass sets up in fixed section of thick bamboo bottom.
3. The gas cell with double wedge convex lens of claim 1, wherein: and the other end of the inner pipe front end flange is welded with the outer pipe front end flange.
4. A gas measurement cell with a double wedge convex lens according to claim 3, wherein: the smoke filter is characterized by further comprising a primary filter element and a secondary filter element which are used for filtering smoke, wherein the secondary filter element is arranged in the flange at the front end of the inner tube, and the primary filter element is arranged in the flange at the front end of the outer tube in close proximity to the secondary filter element.
5. The gas cell with double wedge convex lens of claim 4, wherein: the filter element pressing cap is used for supporting the primary filter element and the secondary filter element and is fixed with the flange at the front end of the outer tube.
6. The gas cell with double wedge convex lens of claim 1, wherein: the flange at the rear end of the inner tube is fixed by the lens fixing cylinder.
7. The gas cell with double wedge convex lens of claim 6, wherein: the vacuum heat insulation tube is characterized by further comprising an optical fiber connector, one end of the optical fiber connector is sleeved outside the lens fixing tube, and one end of the optical fiber connector extends out of the vacuum heat insulation tube to be connected with the Y-shaped optical fiber.
8. The gas cell with double wedge convex lens of claim 1, wherein: the air outlet nozzle is fixed on the flange at the rear end of the inner tube and is communicated with the inside of the inner tube.
9. The gas cell with double wedge convex lens of claim 1, wherein: the inner wall of the flange at the front end of the inner tube is provided with an air guide groove which is communicated with the inside of the inner tube.
10. A meter, characterized in that: the meter is provided with a gas cell according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321201390.XU CN220019369U (en) | 2023-05-18 | 2023-05-18 | Gas measurement air chamber with double wedge-shaped convex lenses and measuring instrument thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321201390.XU CN220019369U (en) | 2023-05-18 | 2023-05-18 | Gas measurement air chamber with double wedge-shaped convex lenses and measuring instrument thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220019369U true CN220019369U (en) | 2023-11-14 |
Family
ID=88674035
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321201390.XU Active CN220019369U (en) | 2023-05-18 | 2023-05-18 | Gas measurement air chamber with double wedge-shaped convex lenses and measuring instrument thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220019369U (en) |
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2023
- 2023-05-18 CN CN202321201390.XU patent/CN220019369U/en active Active
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