CN208206775U - A kind of gas absorption cell - Google Patents
A kind of gas absorption cell Download PDFInfo
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- CN208206775U CN208206775U CN201820792789.2U CN201820792789U CN208206775U CN 208206775 U CN208206775 U CN 208206775U CN 201820792789 U CN201820792789 U CN 201820792789U CN 208206775 U CN208206775 U CN 208206775U
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Abstract
The utility model discloses a kind of gas absorption cells, comprising: fiber optic collimator module, focus module, the cavity module between fiber optic collimator module and focus module, wherein cavity module include along beam course setting stainless steel pipe, respectively with the first cavity and the second cavity of stainless steel pipe both ends airtight connection, first cavity left end and fiber optic collimator module fixing end airtight connection, and it is provided with gas outlet；Second cavity right end and focus module fixing end airtight connection, and it is provided with air inlet, one or both of the first cavity and the second cavity are provided with the temperature and pressure parameter that screw hole is used to test chamber gas chamber for installing at least one sensor on wall.The gas absorption cell has the advantages that structure simple, handling ease, production cost are low etc., can be used for detecting ppm grades of Gases Dissolved in Transformer Oil.
Description
Technical field
The utility model belongs to precision detecting instrument field, and in particular to a kind of gas absorption cell more particularly to a kind of use
In the gas absorption cell of detection Gases Dissolved in Transformer Oil.
Background technique
It is more and more extensive using the application of the technology of spectroscopy measurements one-component or multicomponent gas in the industry.Than
As laser spectrum measuring instrument can be used for monitoring Gases Dissolved in Transformer Oil.Due to " fingerprint " characteristic that gas absorbs, light exists
After the absorption cell full of detected gas, the light of some single-frequency is absorbed by gas in pond, and single-frequency reflects
Gas componant, the variation of single-frequency light intensity then reflect the concentration of detected gas.Industrial production and environmental monitoring neck at present
Many gas componant detection techniques in domain mainly use in infrared and Near Infrared Spectroscopy Detection Technology.It is absorbed due to gas
Cross-sectional area very little improves gas detection sensitivity so generally requiring by increasing light path.
The gas absorption cell of the prior art mainly has two class of long light path pond and adjustable optical path pool.Long light path pond, by inhaling
Receives pond inner plenum places multi-disc reflecting mirror and increases light path using short distance so that light completes multiple reflections in gas chamber,
Improve detection sensitivity.The structure of adjustable optical path pool is substantially with long light path pond, the difference is that can be controlled by adjusting order of reflection
The variation of light path processed.Both of which is by control light path in the hope of reaching target detection sensitivity.Long light path pond and adjustable optical path pool
In optical element it is more, light modulation structure is complicated, so that its volume is relatively large.In addition, long light path pond and adjustable optical path pool are to reflection
The coating process of mirror requires height, and installation maintenance is difficult and at high cost, and anti-vibration resistance is poor, thus environmental suitability is poor.
For the drawbacks described above in long light path pond and adjustable optical path pool, the applicant is public in patent CN201720864607.3
A kind of short light path gas absorption cell 1 ' of small volume is opened, referring to attached drawing 3.The gas absorption cell 1 ' have structure is simple, light path is short,
Volume is small, disassembly easy to install, the advantages that shock resistance is good.But in production and processing, it is found by the applicant that its there are cavity difficult processings
Degree is big, inner wall finish is difficult to the defect ensured, product qualified rate is low, excessively high so as to cause product cost.For example, when cavity is
When metal circular tube equipped with screw hole, the aperture on stainless steel material is needed, is difficult to accomplish very high straightness and high tube wall
Finish causes product qualified rate to reduce, so that production cost is promoted.In addition, tube wall finish cannot reach very high
In the case of index, some extra interferences can be brought to detection signal itself, reduce detection accuracy.
Utility model content
To solve the above problems, simplifying the processing mounting process of gas absorption cell, reduce difficulty of processing, it is qualified to improve product
Rate, to reduce production cost, the applicant has done further complete in structure on the basis of patent CN201720864607.3
It is kind, design a kind of new gas absorption cell.Specifically, the technical solution of the utility model is as described below.
A kind of gas absorption cell, comprising: the fiber optic collimator module for collimating the light of light source, for after collimation
The focus module for focusing light outgoing is focused and made by the light of cavity gas chamber, is located at fiber optic collimator module and focus module
Between, the cavity module for introducing and being discharged under test gas, wherein fiber optic collimator module includes optical fiber collimator, for adjusting
Save the accurate light modulation structure of optical path, for by accurate light modulation structure and the closed fiber optic collimator being fixed together in cavity module left end
Module fixing end, wherein the collimation lens end of optical fiber collimator is inserted into the central through hole of accurate light modulation structure and fixed；It focuses
In module include condenser lens, for fixed focus lenses and with the closed focus module being fixed together of cavity module right end
Fixing end；The both ends of cavity module respectively with fiber optic collimator module fixing end and focus module fixing end airtight connection, cavity mould
The hollow space of block is the cavity gas chamber for accommodating under test gas, and the light beam after collimation is transferred to focusing mould by cavity gas chamber
Block；The cavity module include along beam course setting stainless steel pipe, respectively with stainless steel pipe both ends airtight connection
First cavity and the second cavity, wherein the first cavity left end and fiber optic collimator module fixing end airtight connection, and it is provided with outlet
Mouth or air inlet；Second cavity right end and focus module fixing end airtight connection, and it is provided with air inlet or gas outlet, the
One or both of one cavity and the second cavity are provided with screw hole for installing at least one sensor for test chamber on wall
The parameters such as the temperature and pressure of gas chamber, to be used to be modified to testing result, the optical axis and stainless steel pipe of condenser lens
Central axis, fiber optic collimator module optical axis coincidence, wherein being along beam direction from the left end to the direction of the right end.
In the cavity module of above-mentioned gas absorption cell, gas outlet, air inlet and sensor installation screw are arranged in the first chamber
On body and the second cavity, since the size of the first cavity and the second cavity is greater than stainless steel pipe diameter, so that gas outlet, air inlet
Position arrangement, design and the processing of mouth and sensor installation screw are more easier, and avoid and carry out aperture on stainless steel pipe
And/or welding, it is able to maintain the integrality and best bright finish of inboard wall of tube body, thus efficiently avoid inboard wall of tube body and light is believed
Number interference, achieve the effect that improve detection Signal-to-Noise.This design of above-mentioned gas absorption cell is so that production technology is simple
It is single, the rejection rate of absorption cell is greatly reduced, to reduce production cost.
In a preferred embodiment, the air inlet being arranged on the first cavity and/or the second cavity or gas outlet
It can be in screw hole form.Preferably, the screw hole of air inlet or the screw hole of gas outlet and installation sensor (or install by sensor
Screw hole) it is perpendicular.
Above-mentioned gas absorption cell can reach very high detection accuracy, such as in transformer under the conditions of small volume, short light path
Application in oil dissolved gas detection, better than minimum detection limit as defined in national grid company standard.
One aspect according to the present utility model, the light of above-mentioned light source can be any light that can be used for detection gas, wave
Long range is 200-6000nm, preferably 200-1800nm, including but not limited to visible light, ultraviolet light, infrared light and/or near-infrared
Light.Further, it is preferable to which the light from light source transmitting is laser.
One aspect according to the present utility model, the fiber optic collimator module further include fiber optic collimator module protection shell, are used
It covers optical fiber collimator, accurate light modulation structure, fiber optic collimator module fixing end, protects these components not by external environment and object
The influence of body.
One aspect according to the present utility model, above-mentioned gas absorption cell further include for fixing the fiber optic collimator module
With the absorption cell pedestal of the cavity module and the collimating module.
Preferably, above-mentioned stainless steel pipe is commodity stainless steel pipe, the connection at both ends and the first cavity and the second cavity
Mode is screw thread or welded connecting.Since stainless steel pipe inner wall is highly polished, other factors are avoided for the shadow of optical signal
It rings, improves detection signal quality, so that detection Signal-to-Noise is higher.Simultaneously as stainless steel pipe can use commodity
Stainless steel pipe, especially small-bore stainless steel tube commodity, can be significantly reduced the cost of raw material.
Further, gas absorption cell further includes the light inlet for accessing light source.In one embodiment, it is described enter
Optical port is located on the first cavity.For example, light inlet is equipped with flange, for connecting light source and fiber optic collimator module.
One aspect according to the present utility model is provided with light-emitting window (i.e. condenser lens in the focus module fixing end
Exit portal), the optical axis coincidence of the central axis of the optical axis of condenser lens and stainless steel pipe, fiber optic collimator module.For example, should go out
Optical port is arranged in focus module fixing end.
One aspect according to the present utility model has central through hole in the fiber optic collimator module fixing end, and the center is logical
Oblique window is fixed in hole, for reducing optical standard tool interference.
One aspect according to the present utility model, focus module fixing end rear portion can further connect photodetection mould
Block, the photoelectric detection module are converted to electric signal for receiving the light transmitted from the light-emitting window.
The utility model additionally provides application of the above-mentioned gas absorption cell in gas detection.
One aspect according to the present utility model, above-mentioned gas absorption cell can be used for detecting Gases Dissolved in Transformer Oil.
In a preferred embodiment, the Gases Dissolved in Transformer Oil is selected from N2、O2、H2、CH4、C2H2、C2H4、
C2H6、CO、CO2One or more of.
For the gas absorption cell disclosed in the patent CN201720864607.3, the gas absorption cell of the utility model
In addition to retain its structure is simple, light path is short, volume is small, it is easy to install disassembly, shock resistance is good, environment is practical the advantages that other than, also
Difficulty of processing and installation difficulty are reduced, product qualification rate is substantially increased, qualification rate is higher than 95%, is produced into reduce
This；Further improve the air-tightness of cavity module cavity gas chamber, and since inboard wall of tube body is highly polished, reduce other because
Interference of the element for optical signal, so that detection Signal-to-Noise is higher.
Detailed description of the invention
Fig. 1 is the top view of a gas absorption cell embodiment according to the present utility model.Description of symbols therein
It is as follows: 1, gas absorption cell；2, fiber optic collimator module；21, optical fiber collimator；22, accurate light modulation structure；23, fiber optic collimator mould
Block fixing end；24, fiber optic collimator module protection shell；3, focus module；31, condenser lens；32, focus module fixing end；33, go out
Optical port；4, cavity module；41, stainless steel pipe；421, light inlet；42, the first cavity；43, the second cavity；44, gas outlet；
45, air inlet；46, sensor；5, absorption cell pedestal.
Fig. 2 is the main view of gas absorption cell embodiment shown in Fig. 1.
Fig. 3 is the structural schematic diagram of gas absorption cell disclosed in patent CN201720864607.3.It is noted that its
In appended drawing reference do not represent the appended drawing reference in utility model diagram shown in Fig. 1.
Specific embodiment
Below in conjunction with attached drawing, the technical solution of the utility model is described.Obviously, described embodiment is only
A part of embodiment of the application, rather than whole embodiments；And structure shown in the drawings is only schematical,
Material object is not represented.It should be noted that based on these embodiments in the utility model, those of ordinary skill in the art are obtained
The every other embodiment obtained, shall fall in the protection scope of this application.
Herein, term " gas absorption cell " and " absorption cell " indicate identical meaning, can be interchanged.
Herein, term " cavity gas chamber " and " gas chamber " indicate identical meaning, can be interchanged.
Herein, term " absorption cell pedestal " and " pedestal " indicate identical meaning, can be interchanged.
Herein, term " left side " indicates to close in the gas absorption cell of the utility model along the upstream position of beam direction
System, but be not meant to must be directed towards a certain fixed-direction in actual installation practice, just to show between all parts
Positional relationship or connection relationship.Similarly, term " right side ", "upper", "lower" etc. do not constitute absolute spatial relationship limitation, only
A kind of opposite concept.This is that those skilled in the art can understand.It is convenient sometimes for being described on text, it can be towards
Attached drawing direction, is known as " preceding " for beam direction upstream side, beam direction downstream side is known as " rear ", only a kind of opposite general
It reads, this is that those skilled in the art can understand.
Referring to Fig. 1 and Fig. 2, the utility model gas absorption cell 1 mainly include fiber optic collimator module 2, focus module 3,
These three parts of cavity module 4.Wherein fiber optic collimator module 2 is for being incident to cavity module 4 after being collimated the light of light source
Cavity gas chamber in, to be absorbed for the indoor under test gas of cavity gas.Fiber optic collimator module 2 mainly includes optical fiber collimator
21, for adjust optical path to keep light beam coaxial with the optical axis of following condenser lenses 31 accurate light modulation structure 22, be used for will be smart
The closed fiber optic collimator module fixing end 23 being fixed together of the first cavity 42 of close light modulation structure 22 and 4 left end of cavity module.
Preferably, fiber optic collimator module 2 further includes fiber optic collimator module protection shell 24, which is used to cover optical fiber collimator
21, accurate light modulation structure 22, fiber optic collimator module fixing end 23, protect these components not influenced by external environment and object.
Preferably, the collimation lens end of optical fiber collimator 21 is inserted into the central through hole of accurate light modulation structure 22 and fixed.
Fiber optic collimator module fixing end 23 is equipped with central through hole, can be fixed with oblique window in the central through hole, be used to
Reduce optical standard tool interference, guarantees gas detection accuracy.
Focus module 3 is mainly including condenser lens 31, for fixed focus lenses 31 and with 4 right end of cavity module
The closed focus module fixing end 32 being fixed together of two chamber 43.Light-emitting window 33 is provided in focus module fixing end 32 (i.e.
Condenser lens exit portal 33).
Cavity module 4 includes the stainless steel pipe 41 along beam course setting, the first cavity positioned at front end (i.e. left end)
42, it is located at second cavity 43 of rear end (i.e. right end), the first cavity 42 and the second cavity 43 are fixed with fiber optic collimator module respectively
End 23 and 32 airtight connection of focus module fixing end, the hollow space of cavity module 4 are the cavity gas for accommodating under test gas
Room, light beam after collimation are transferred to focus module 3 by cavity gas chamber, the optical axis of condenser lens 31 with it is stainless in cavity module 4
The optical axis coincidence of the central axis of steel pipe fitting 41, fiber optic collimator module 2.
Stainless steel pipe 41 be preferably commodity stainless steel pipe, rear and front end respectively with the first cavity 42 and the second cavity 43
Connection type be threadedly coupled or welding.Since 41 inner wall of stainless steel pipe is highly polished, other factors are avoided for light
The influence of signal improves detection signal quality, so that detection Signal-to-Noise is higher.Simultaneously as stainless steel pipe 41 can
To use commodity stainless steel pipe, especially small-bore stainless steel tube commodity, the cost of raw material can be significantly reduced.
First cavity, 42 left end and 23 airtight connection of fiber optic collimator module fixing end, on 42 wall of the first cavity (such as Fig. 1 institute
Show the lateral location of main view shown in top view and Fig. 2) be provided with can in screw hole form gas outlet 44 or air inlet 45；
Second cavity, 43 right end and 32 airtight connection of focus module fixing end, (than top view as shown in Figure 1 and figure on 43 wall of the second cavity
The lateral location of main view shown in 2) be provided with air inlet 45 or gas outlet 44, one of the first cavity 42 and the second cavity 43 or
The top position of main view shown in the suitable position of the wall surface of the two top view such as shown in Fig. 1 and Fig. 2 is equipped with connecting hole ratio
Such as screw hole and/or jack are used to install the temperature and pressure parameter that at least one sensor 46 is used to test chamber gas chamber, with
Just it is used to be modified testing result.It shows in Fig. 1 and Fig. 2 and is both provided on 43 top of the first cavity 42 and the second cavity
The embodiment of screw hole installation sensor 46.It should be understood that the position of air inlet 45 and gas outlet 44 can carry out according to actual needs
Switching.
The shape of first cavity 42 and the second cavity 43, for example, overlook when can generally L-shaped structure (such as Fig. 1 institute
Show).Since the size of the first cavity 42 and the second cavity 43 is greater than 41 diameter of stainless steel pipe, so that gas outlet 44, air inlet
45 and position arrangement, design and the processing of 46 installation screw of sensor be more easier, avoid and carried out on stainless steel pipe 41
Aperture and/or welding are able to maintain the integrality and best bright finish of 41 inner wall of stainless steel pipe.
In one embodiment, light inlet 421 can be equipped on the first cavity 42, light inlet 421 is equipped with flange use
In connection light source.
41 both ends of stainless steel pipe are preferably threadedly coupled with the connection type of the first cavity 42 and the second cavity 43.
In a preferred embodiment, above-mentioned accurate light modulation structure 22 can utilize the stability principle of triangle, adopt
With double triangle nested structure, the fine adjustment of optical path is realized, so that optical path adjusting is simple, stable structure and shock resistance are good.
It is preferably carried out in mode in one kind, absorption cell 1 further includes for the fixed pedestal 5 for supporting entire absorption cell 1.
Preferably, the first cavity 42 and 43 bottom of the second cavity can be respectively equipped with threaded hole, with absorption cell pedestal 5 and work
Make platform (not shown) to be screwed connection；Absorption cell pedestal 5 is equipped with threaded hole, is screwed and connect with workbench, guarantees to inhale
The shock resistance of receives pond 1.
Above-mentioned 3 rear portion of focus module can further connect photoelectric detection module, and the photoelectric detection module is for receiving from out
The light of the outgoing of optical port 33 is simultaneously converted to electric signal.
Above-mentioned gas absorption cell 1 can be applied to detection gas.For example it can be used for detecting Gases Dissolved in Transformer Oil.
Gas in Oil of Transformer component and concentration largely reflect the thermoelectricity fault degree of transformer and use the longevity
Life, Gas in Oil of Transformer, which analyzes oneself, becomes the effective technology means of inside transformer Hidden fault detection.Research and development
Multicomponent gas, online measuring technique in transformer oil have important theory and realistic meaning.Solution gas in transformer oil
Body component mainly has N2、O2、H2、CH4、C2H2、C2H4、C2H6、CO、CO2Equal gases.Under normal circumstances in oil-immersed power transformer
Oil and insulation paper material under heat and the collective effect of electricity, can gradually aging and decomposition, generate a small amount of low molecular hydrocarbon and
CO2, the gases such as CO.If Superheated steam drier, discharging fault or dampness situation occur for inside transformer, the yield of these gases
It can increase sharply.Therefore it can reflect the operation conditions of transformer by monitoring Gas in Oil of Transformer type and content on-line,
Timely and accurately detect power transformer Hidden fault.
It is found through experiments that, the gas absorption cell 1 of the utility model is used for by the laser of infrared light and/or near infrared light
Detect Gases Dissolved in Transformer Oil component such as N2、O2、H2、CH4、C2H2、C2H4、C2H6、CO、CO2When equal gases, have high
Detection sensitivity and reliability, such as gas absorption cell 1 for above-mentioned gas Monitoring lower-cut lower than State Grid Corporation of China look forward to
Lowest detection limit value as defined in industry standard, therefore on-line checking can be effectively realized, reduce the rate of false alarm of transformer fault.
It should be noted that the terms "include", "comprise" herein or its any other variant are intended to non-row
His property includes, so that the process, method, article or equipment for including a series of elements not only includes those elements, and
And further include other elements that are not explicitly listed, or further include for this process, method, article or equipment institute it is intrinsic
Element.
Above embodiments are only to illustrate the technical solution of the utility model patent, rather than its limitations；Although referring to before
Embodiment is stated the utility model patent is described in detail, those skilled in the art should understand that: it is still
It is possible to modify the technical solutions described in the foregoing embodiments, or part of technical characteristic is equally replaced
It changes；And these are modified or replaceed, each embodiment technology of the utility model patent that it does not separate the essence of the corresponding technical solution
The spirit and scope of scheme.
Claims (10)
1. a kind of gas absorption cell, comprising: the fiber optic collimator module for collimating the light of light source, for leading to after collimation
The light for crossing cavity gas chamber is focused and makes the focus module for focusing light outgoing, be located at fiber optic collimator module and focus module it
Between, the cavity module for introducing and being discharged under test gas, wherein
The fiber optic collimator module includes optical fiber collimator, the accurate light modulation structure for adjusting optical path, for dimming precision
Structure and the closed fiber optic collimator module fixing end being fixed together in cavity module left end, the wherein collimation lens of optical fiber collimator
End is inserted into the central through hole of accurate light modulation structure and fixed；
Include in the focus module condenser lens, for fixed focus lenses and with cavity module right end is closed is fixed on one
The focus module fixing end risen；
The both ends of the cavity module respectively with fiber optic collimator module fixing end and focus module fixing end airtight connection, cavity mould
The hollow space of block is the cavity gas chamber for accommodating under test gas, and the light beam after collimation is transferred to focusing mould by cavity gas chamber
Block；
The cavity module include along beam course setting stainless steel pipe, respectively with stainless steel pipe both ends airtight connection
First cavity and the second cavity, wherein the first cavity left end and fiber optic collimator module fixing end airtight connection, and it is provided with outlet
Mouth or air inlet；Second cavity right end and focus module fixing end airtight connection, and it is provided with air inlet or gas outlet, the
One or both of one cavity and the second cavity are provided with screw hole for installing at least one sensor for test chamber on wall
The optical axis of the central axis of the temperature and pressure parameter of gas chamber, the optical axis of condenser lens and stainless steel pipe, fiber optic collimator module
It is overlapped, wherein being along beam direction from the left end to the direction of the right end.
2. gas absorption cell as described in claim 1, which is characterized in that the fiber optic collimator module further includes fiber optic collimator mould
Block protection shell, for covering optical fiber collimator, accurate light modulation structure, fiber optic collimator module fixing end, protect these components not by
The influence of external environment and object.
3. gas absorption cell as described in claim 1, which is characterized in that be arranged on first cavity and/or the second cavity
Air inlet or gas outlet screw hole and install sensor screw hole it is perpendicular.
4. gas absorption cell as described in claim 1, which is characterized in that further include for fix the fiber optic collimator module,
The absorption cell pedestal of the cavity module and the focus module.
5. gas absorption cell as described in claim 1, which is characterized in that the stainless steel pipe is commodity stainless steel pipe,
The connection type of both ends and the first cavity and the second cavity is screw thread or welding.
6. gas absorption cell as described in claim 1, which is characterized in that further include being located on the first cavity, for accessing light
The light inlet in source.
7. gas absorption cell as claimed in claim 1 or 2, which is characterized in that be provided with out in the focus module fixing end
The light of the central axis of optical port, the i.e. exit portal of condenser lens, the optical axis of condenser lens and stainless steel pipe, fiber optic collimator module
Overlapping of axles.
8. gas absorption cell as claimed in claim 1 or 2, which is characterized in that in having in the fiber optic collimator module fixing end
Heart through-hole is fixed with oblique window in the central through hole, for reducing optical standard tool interference.
9. gas absorption cell as claimed in claim 7, which is characterized in that the focus module fixing end further connects photoelectricity
Detecting module, the photoelectric detection module are used to receive the light being emitted from the light-emitting window and are converted to electric signal.
10. gas absorption cell as claimed in claim 1 or 2, which is characterized in that the inspection of for transformer oil dissolved gas
It surveys.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820792789.2U CN208206775U (en) | 2018-05-25 | 2018-05-25 | A kind of gas absorption cell |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820792789.2U CN208206775U (en) | 2018-05-25 | 2018-05-25 | A kind of gas absorption cell |
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| Publication Number | Publication Date |
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| CN208206775U true CN208206775U (en) | 2018-12-07 |
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| CN201820792789.2U Active CN208206775U (en) | 2018-05-25 | 2018-05-25 | A kind of gas absorption cell |
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| Country | Link |
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| CN (1) | CN208206775U (en) |
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2018
- 2018-05-25 CN CN201820792789.2U patent/CN208206775U/en active Active
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