CN202548087U - Catalytic combustion type gas sensitive element packaging structure - Google Patents
Catalytic combustion type gas sensitive element packaging structure Download PDFInfo
- Publication number
- CN202548087U CN202548087U CN2012200410163U CN201220041016U CN202548087U CN 202548087 U CN202548087 U CN 202548087U CN 2012200410163 U CN2012200410163 U CN 2012200410163U CN 201220041016 U CN201220041016 U CN 201220041016U CN 202548087 U CN202548087 U CN 202548087U
- Authority
- CN
- China
- Prior art keywords
- sensitive element
- gas sensitive
- shell
- catalytic combustion
- combustion type
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000007084 catalytic combustion reaction Methods 0.000 title claims abstract description 17
- 238000004806 packaging method and process Methods 0.000 title abstract 3
- 230000002209 hydrophobic effect Effects 0.000 claims abstract description 13
- 239000004965 Silica aerogel Substances 0.000 claims abstract description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 4
- 238000009413 insulation Methods 0.000 claims description 10
- 239000012774 insulation material Substances 0.000 claims description 10
- 230000035945 sensitivity Effects 0.000 abstract description 6
- 239000011810 insulating material Substances 0.000 abstract 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 19
- 238000005538 encapsulation Methods 0.000 description 18
- 230000000052 comparative effect Effects 0.000 description 4
- 230000004044 response Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 230000001590 oxidative effect Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 206010070834 Sensitisation Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000011859 microparticle Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000008313 sensitization Effects 0.000 description 1
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- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
Abstract
The utility model provides a catalytic combustion type gas sensitive element packaging structure which comprises a gas sensitive element (2), a pipe shell (3), a leading line (4) and leading feet (5). Two ends of the gas sensitive element (2) are respectively connected with the leading feet (5) through the leading line (4) in the pipe shell (3). The top of the pipe shell (3) is provided with an air vent (6). Ventilating and heat-insulating materials (1) are disposed in the pipe shell (3) and wrap portions of the gas sensitive element (2), the leading line (4) and the leading feet (5) in the pipe shell (3). The ventilating and heat-insulating materials (1) are hydrophobic silica aerogel or hydrophobic nanometer framework materials. The catalytic combustion type gas sensitive element packaging structure can effectively reduce heat loss of sensitive elements of a sensor and improve sensitivity.
Description
Technical field
The utility model relates to a kind of encapsulation of firedamp sensor sensitive element, relates in particular to a kind of encapsulation of catalytic combustion type firedamp sensor sensitive element.
Background technology
At present, the catalytic combustion type firedamp sensor be scenes such as coal mine still at widely used a kind of gas density horizontal detection sensor, but its power consumption is bigger, usually at 200 ~ 600mW.Along with the development of technology of Internet of things, press for the firedamp sensor of low-power consumption.The microminiaturization that present research concentrates on through sensor reduces power consumption, but sensitivity also decreases when reducing power consumption, is difficult to satisfy the on-the-spot actual demand of using.
Existing catalytic combustion type firedamp sensor adopts traditional metal TO shell encapsulation to constitute air chamber; Encapsulation shell top has bleeder vent; Air chamber is the space through the bleeder vent and the external environment connect of shell between sensor sensing element in the air chamber and the package casing.Methane gas goes out its concentration by sensor after getting into air chamber through bleeder vent.Its principle of work is to rely on the self-heating effect of RTD that promptly black, the white element of sensitive element is heated to the temperature that methane gas can carry out the oxidizing fire reaction, and this consumes bigger electrical power consumed.Having under the situation of methane gas, the reaction heat that oxidizing fire discharges RTD when causing temperature to raise, and relies on the unbalanced signal that detects electric bridge to detect the variation of RTD, thereby realizes the detection of gas density.Under the hot operation state of heating certainly, the electric power part that RTD consumed is kept the required temperature of black-and-white component, and other has very most of energy to dissipate through encapsulation shell, lead-in wire and surrounding air with the form of heat.
Summary of the invention
Technical matters:The purpose of the utility model is to overcome the heat dissipation problems that existing catalytic combustion type firedamp sensor encapsulation exists; Providing a kind of can reduce the thermal losses of sensor sensing element and have simultaneously very highly sensitive encapsulation again; Need not to change the sensitive element of existing catalytic combustion type firedamp sensor, and realize the reduction of power consumption and keep very high sensitivity through novel encapsulated.
Technical scheme:The utility model is the basis with catalytic combustion type black-and-white component firedamp sensor, and encapsulation breathable insulation insulation material in traditional shell is like hydrophobic silica aerogel.Hydrophobic silica aerogel has extremely low thermal conductivity and specific heat capacity, and its thermal conductivity is also lower than air, and the nanoaperture structure of hydrophobic silica aerogel can let methane gas arrive the surface generation oxidation heat release reaction of sensor smoothly again simultaneously.The utility model not only can effectively reduce the thermal losses of catalytic combustion type firedamp sensor sensitive element; Can also avoid the sensitive element near surface to produce violent gas disturbance dissipates heat; Thereby help oxidizing fire is reacted the surface that institute's liberated heat remains on the sensor sensing element, and improve sensitivity.
The encapsulating structure of the catalytic combustion type gas sensitive element of the utility model comprises the gas sensitive element, shell, lead-in wire, pin; In shell; The two ends of gas sensitive element are connected with pin through lead-in wire respectively; Top at shell is provided with air hole, in shell, is provided with the breathable insulation insulation material, breathable insulation insulation material parcel gas sensitive element, lead-in wire and the part of pin in shell.
Described breathable insulation insulation material is hydrophobic silica aerogel or dewatering nano framework material etc.
Beneficial effect:The firedamp sensor sensitive element encapsulation of the utility model adopts hydrophobic silica aerogel to realize the heat isolation between sensor sensing element and encapsulation shell and the air in shell.Compare with the traditional element that does not adopt this encapsulation, adopt the element of the utility model can be operated under the very low electric current about 70mA.And the sensitivity of the element in original encapsulation under this electric current is very low, can't use.The element power consumption that adopts the utility model to encapsulate is compared with the rated disspation of the element that adopts original encapsulation and can be reduced about 30～40%; Sensitivity simultaneously still can be up to 50mV/1%CH
4, highly sensitive during also than the element nominal operation state of original encapsulation.Therefore be that existing catalytic combustion method gas sensor reduces power consumption and highly sensitive effective packing forms is provided.This encapsulation can also be adsorbed on-the-spot pollutants such as coal dust such as mine, helps prolonging the life-span of sensor.The utility model can also be used for the encapsulation based on other gas sensor sensitive element of catalytic combustion type principle, and adopts type of heating to realize other gas sensor to gas sensitization.
Description of drawings
Fig. 1 is the structural representation of the utility model;
Fig. 2 is the sensitivity-current response characteristic comparison diagram of the embodiment and the comparative example of the utility model;
Fig. 3 is the sensitivity-power response characteristic comparison diagram of the embodiment and the comparative example of the utility model;
Among the figure, the resonse characteristic of a1, b1 embodiment, the resonse characteristic of a2, b2 Comparative Examples.
Embodiment
Do further to describe below in conjunction with accompanying drawing and to the enforcement of the utility model:
Fig. 1 is the encapsulation of a kind of catalytic combustion type gas sensitive element of the utility model, comprises breathable insulation insulation material 1, and gas sensitive element 2 is provided with the shell 3 of air hole 6, lead-in wire 4, pin 5.The breathable insulation insulation material adopts hydrophobic silica aerogel or dewatering nano framework material; Hydrophobic silica aerogel is filled in shell 3; The two ends of gas sensitive element 2 are connected with pin 5 through lead-in wire 4 respectively; Be provided with air hole 6 at the top of shell 3, hydrophobic silica aerogel parcel gas sensitive element 2, lead-in wire 4 and the part of pin 5 in shell 3.
The breathable insulation insulation material is not limited to be packaged in the shell and wrap up firedamp sensor sensitive element 2, lead-in wire 4 and the part of pin 5 in shell 3 with powder or microparticle and whole form.
Fig. 2 and Fig. 3 are that response characteristic (a1, b1) and the comparative example of embodiment (shell in encapsulation hydrophobic silica aerogel) is that the response characteristic of no hydrophobic silica aerogel in the shell compares (a2, b2).
Claims (2)
1. the encapsulating structure of a catalytic combustion type gas sensitive element is characterized in that this encapsulating structure comprises gas sensitive element (2), shell (3), lead-in wire (4), pin (5); In shell (3); The two ends of gas sensitive element (2) are connected with pin (5) through lead-in wire (4) respectively; Be provided with air hole (6) at the top of shell (3); In shell (3), be provided with breathable insulation insulation material (1), breathable insulation insulation material (1) parcel gas sensitive element (2), lead-in wire (4) and the part of pin (5) in shell (3).
2. the encapsulating structure of catalytic combustion type gas sensitive element according to claim 1 is characterized in that described breathable insulation insulation material (1) is hydrophobic silica aerogel or dewatering nano framework material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200410163U CN202548087U (en) | 2012-02-09 | 2012-02-09 | Catalytic combustion type gas sensitive element packaging structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200410163U CN202548087U (en) | 2012-02-09 | 2012-02-09 | Catalytic combustion type gas sensitive element packaging structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202548087U true CN202548087U (en) | 2012-11-21 |
Family
ID=47168704
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200410163U Expired - Fee Related CN202548087U (en) | 2012-02-09 | 2012-02-09 | Catalytic combustion type gas sensitive element packaging structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202548087U (en) |
-
2012
- 2012-02-09 CN CN2012200410163U patent/CN202548087U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121121 Termination date: 20170209 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |