CN114353849B - Device for protecting temperature and pressure sensor from being corroded by fuel gas - Google Patents
Device for protecting temperature and pressure sensor from being corroded by fuel gas Download PDFInfo
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- CN114353849B CN114353849B CN202210026199.XA CN202210026199A CN114353849B CN 114353849 B CN114353849 B CN 114353849B CN 202210026199 A CN202210026199 A CN 202210026199A CN 114353849 B CN114353849 B CN 114353849B
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- pressure sensor
- temperature
- protective cover
- protecting
- oil
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- 239000002737 fuel gas Substances 0.000 title claims abstract description 24
- 230000001681 protective effect Effects 0.000 claims abstract description 68
- 238000005516 engineering process Methods 0.000 claims abstract description 9
- 238000002955 isolation Methods 0.000 claims abstract description 7
- 230000000903 blocking effect Effects 0.000 claims abstract description 5
- 238000007789 sealing Methods 0.000 claims abstract description 4
- 239000007789 gas Substances 0.000 claims description 23
- 238000005260 corrosion Methods 0.000 claims description 8
- 230000007797 corrosion Effects 0.000 claims description 8
- 229910000570 Cupronickel Inorganic materials 0.000 claims description 3
- 239000000945 filler Substances 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- AMTWCFIAVKBGOD-UHFFFAOYSA-N dioxosilane;methoxy-dimethyl-trimethylsilyloxysilane Chemical compound O=[Si]=O.CO[Si](C)(C)O[Si](C)(C)C AMTWCFIAVKBGOD-UHFFFAOYSA-N 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 229940083037 simethicone Drugs 0.000 claims description 2
- 230000035699 permeability Effects 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 abstract description 2
- 229920002545 silicone oil Polymers 0.000 description 18
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 description 6
- RVCKCEDKBVEEHL-UHFFFAOYSA-N 2,3,4,5,6-pentachlorobenzyl alcohol Chemical compound OCC1=C(Cl)C(Cl)=C(Cl)C(Cl)=C1Cl RVCKCEDKBVEEHL-UHFFFAOYSA-N 0.000 description 3
- YOCUPQPZWBBYIX-UHFFFAOYSA-N copper nickel Chemical compound [Ni].[Cu] YOCUPQPZWBBYIX-UHFFFAOYSA-N 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- LAXBNTIAOJWAOP-UHFFFAOYSA-N 2-chlorobiphenyl Chemical compound ClC1=CC=CC=C1C1=CC=CC=C1 LAXBNTIAOJWAOP-UHFFFAOYSA-N 0.000 description 2
- 101710149812 Pyruvate carboxylase 1 Proteins 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000010292 electrical insulation Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Landscapes
- Measuring Fluid Pressure (AREA)
Abstract
The invention discloses a device for protecting a temperature and pressure sensor from being corroded by fuel gas, which comprises a PCB and the temperature and pressure sensor fixed on the PCB through an SMT (surface Mount technology); further comprises: a protective cover and a protective cap; the protective cover is fixed on the PCB in a sealing way and covers the temperature and pressure sensor; the top wall of the protective cover is provided with an oil filling hole and a micropore; the protective cover is filled with isolation oil; the protective cap is buckled on the protective cover and is provided with a plunger for blocking the oil filling hole. According to the invention, the temperature and pressure sensor is isolated from the fuel gas by the protective cover and the protective cap with air permeability and thermal conductivity by utilizing the isolating oil liquid, and the temperature and pressure sensor can normally work for a long time under the condition of not directly contacting the fuel gas.
Description
Technical Field
The invention relates to the technical field of ultrasonic gas meters, in particular to a device for protecting a temperature and pressure sensor from being corroded by gas.
Background
Temperature and pressure sensors are used in gas meter devices because the gas environment contains H 2 S and other corrosive gas components, and the temperature and pressure sensor can corrode the sensor after being exposed to the environment for a long time, so that the sensor data is distorted or even fails. Specifically, the temperature and pressure sensor is a packaged electronic component which can be pasted by SMT, and PCBA is produced in batches by using SMT technology. The device can collect the temperature value and the pressure value in the environment. If the PCBA after the patch is applied to an ultrasonic gas meter, when components of the PCBA are directly contacted with fuel gas, the components are corroded by corrosive gas in the fuel gas, so that the performance of the components is invalid.
At present, units using temperature and pressure sensors in the environment on the market cannot develop effective measures which can effectively work for a long time and can protect the temperature and pressure sensors from being corroded by fuel gas. The problem of corrosion leading to distortion and even failure of sensor data has plagued the use of temperature and pressure sensors in gas meters.
Therefore, how to provide a device for protecting a temperature and pressure sensor from being corroded by fuel gas is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention provides a device for protecting a temperature and pressure sensor from being corroded by fuel gas, which aims to solve the above technical problems.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a device for protecting a temperature and pressure sensor from being corroded by fuel gas comprises a PCB board and the temperature and pressure sensor fixed on the PCB board through an SMT (surface Mount technology); further comprises:
a protective cover; the protective cover is fixed on the PCB in a sealing way and covers the temperature and pressure sensor; the top wall of the protective cover is provided with an oil filling hole and a micropore; the protective cover is internally filled with isolation oil;
protective cap; the protective cap is buckled on the protective cover and is provided with a plunger for blocking the oil filling hole.
Through the technical scheme, the temperature and pressure sensor is isolated from the fuel gas by the protective cover and the protective cap with air permeability and thermal conductivity, and the temperature and pressure sensor can normally work for a long time under the condition of not directly contacting the fuel gas.
Preferably, in the above device for protecting a temperature and pressure sensor from being corroded by fuel gas, the protective cover and the protective cap are both made of nickel-copper alloy by stretching. The nickel-white copper has the characteristics of corrosion resistance and good heat conduction, can be stretched, and is easy to realize in structure processing.
Preferably, in the device for protecting the temperature and pressure sensor from being corroded by fuel gas, the isolation oil is simethicone. The isolation oil selects the dimethyl silicone oil, and the characteristics of good weather resistance, small viscosity change along with temperature, good thermal conductivity, good chemical stability, neutrality, no corrosion, good electrical insulation and the like of the dimethyl silicone oil are considered, so that the dimethyl silicone oil can be used for a long time in a gas environment.
Preferably, in the device for protecting the temperature and pressure sensor from being corroded by fuel gas, the bottom edge of the protective cover is provided with a radial protruding annular bonding pad; the annular bonding pad is welded on the PCB through an SMT technology. The bonding pad for the SMT patch welding protective cover on the PCB is connected with the ground of the temperature and pressure sensor, and the environmental temperature is transmitted to the temperature and pressure sensor through the annular bonding pad by utilizing the thermal conductivity of the nickel-copper protective cover and the protective cap, so that the temperature value of the gas in the meter is acquired.
Preferably, in the device for protecting the temperature and pressure sensor from being corroded by fuel gas, the height of the protective cover is 8mm, the diameter is 6mm, and the thickness is 0.2mm; the outer diameter of the annular bonding pad is 8.4mm. And welding an annular bonding pad at the bottom of the protective cover on the PCB by using an SMT technology, covering the temperature and pressure sensor, and forming an inner space capable of storing silicone oil by utilizing a height space.
Preferably, in the device for protecting a temperature and pressure sensor from being corroded by fuel gas, the oil filling hole is formed in the middle of the top wall of the protective cover; the number of the micropores is a plurality, and the micropores are arranged around the oil filling hole. The oil filling hole is used for providing an injection channel for isolating oil; the microwells are used for ventilation with the outside.
Preferably, in the above device for protecting a temperature and pressure sensor from being corroded by fuel gas, the diameter of the oil filling hole is 1.2mm; the diameter of the micropores is 0.016mm. The micropore structure utilizes the surface tension of silicone oil, can not flow out of micropores, and can be used for enabling gas to be unobstructed.
Preferably, in the above device for protecting a temperature and pressure sensor from being corroded by fuel gas, the protective cap comprises a cover body and two skirt boards symmetrically fixed on the bottom edge of the side wall of the cover body; the plunger is formed in the center of the inner side of the top surface of the cover body. An air inlet gap is formed between the cover side plate and the side wall of the protective cover. The oil filler hole of protection casing is plugged up to the plunger of protection block, and the inside diameter of protection block is bigger than the protection casing external diameter to the shirt rim board is decurrent, makes the gas get into the plane space on the protection casing from bottom to top through the space between protection block and the protection casing, through micropore and silicone oil contact, and the purpose of design is that the particulate dust class foreign matter that exists in the gas prevents to block up the micropore like this.
Compared with the prior art, the temperature and pressure sensor is isolated from the fuel gas by the isolating device with air permeability and heat conductivity and by utilizing the characteristics of good chemical stability, electrical insulation and weather resistance of the dimethyl silicone oil, and the temperature and pressure sensor can normally work for a long time under the condition of not directly contacting the fuel gas.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of the external structure of the device according to the present invention;
FIG. 2 is an exploded view of the apparatus provided by the present invention;
FIG. 3 is a cross-sectional view of the device provided by the present invention;
FIG. 4 is a schematic view of the structure of the outer side of the protective cover according to the present invention;
FIG. 5 is a schematic view of the structure of the inner side of the protective cover according to the present invention;
FIG. 6 is a schematic view of the structure of the outer side of the protective cap according to the present invention;
fig. 7 is a schematic structural view of the inner side of the protective cap according to the present invention.
Wherein:
1-a PCB board;
2-a temperature and pressure sensor;
3-protecting cover;
31-an oil filling hole; 32-microwells; 33-annular bonding pads;
4-protecting the cap;
41-a plunger; 42-cover; 43-skirt panel;
and 5-isolating oil.
Detailed Description
The following description of the embodiments of the present invention 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 invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1 to 7, an embodiment of the present invention discloses a device for protecting a temperature and pressure sensor from being corroded by fuel gas, comprising a PCB board 1, and a temperature and pressure sensor 2 fixed on the PCB board 1 by an SMT patch process; further comprises:
a protective cover 3; the protective cover 3 is fixed on the PCB 1 in a sealing way and covers the temperature and pressure sensor 2; the top wall of the protective cover 3 is provided with an oil filling hole 31 and a micropore 32; the protective cover 3 is filled with isolation oil 5;
a protective cap 4; the protective cap 4 is fastened to the protective cover 3 and has a plunger 41 for blocking the oil filling hole 31.
In order to further optimize the technical scheme, the protective cover 3 and the protective cap 4 are both made of nickel-white copper by stretching.
In order to further optimize the technical scheme, the isolation oil 5 is dimethyl silicone oil.
In order to further optimize the above solution, the bottom edge of the shield 3 has radially protruding annular pads 33; the annular pad 33 is soldered to the PCB board 1 by SMT technology.
In order to further optimize the technical scheme, the height of the protective cover 3 is 8mm, the diameter is 6mm, and the thickness is 0.2mm; the outer diameter of the annular pad 33 is 8.4mm.
In order to further optimize the technical scheme, the oil filling hole 31 is formed in the middle of the top wall of the protective cover 3; the number of the micro holes 32 is plural, and is arranged around the oil filler hole 31.
In order to further optimize the technical scheme, the diameter of the oil filling hole 31 is 1.2mm; the diameter of the micropores 32 is 0.016mm.
In order to further optimize the technical solution, the protective cap 4 comprises a cover body 42 and two skirt boards 43 symmetrically fixed on the bottom edge of the side wall of the cover body 42; the plunger 41 is formed at the inner center of the top surface of the cover 42.
In order to further optimize the technical scheme, an air inlet gap is formed between the side plate of the cover body 42 and the side wall of the protective cover 3.
The long-term use temperature of the dimethyl silicone oil is-50 ℃ to 200 ℃, and the requirement of the gas working environment temperature is met. Since the silicone oil exists in a liquid state for a long period of time and has fluidity, it is necessary to store the silicone oil by applying a structural member so that the silicone oil is fixedly stored on the temperature and pressure sensor 2 and covered. The structural member is designed as a straw hat-shaped structural member which is formed by stretching nickel-copper material with the thickness of 0.2mm to a height of 8mm, the diameter of 6mm and the outer diameter of an annular bonding pad of 8.4mm, namely a protective cover 3, the annular bonding pad 33 is welded on the PCB 1 by using the SMT technology, the temperature and pressure sensor 2 is covered, and an inner space capable of storing silicone oil is formed by utilizing the height space. Silicone oil is injected through the oil injection hole 31 of phi 1.2mm on the upper plane of the protective cover 3. The oil filling hole 31 is then blocked by the plunger 41 on the protective cap 4 so that the silicone oil does not flow out of the oil filling hole 31. While the gas pressure is vented to the outside through a plurality of phi 0.016mm micro-holes 32 in the upper plane of the shield 3. The micropores 32 are formed by using the surface tension of silicone oil, so that the silicone oil does not flow out of the micropores 32, and the gas can be unobstructed. The plunger 41 blocks the oil filling hole 31 of the protective cover 3, the inner diameter of the protective cap 4 is larger than the outer diameter of the protective cover 3, and the skirt plate 43 is downward, so that gas enters the upper plane space of the protective cover 3 from bottom to top through a gap between the protective cap 4 and the protective cover 3, and contacts with silicone oil through the micropores 32, and the purpose of the design is to prevent particulate dust foreign matters existing in the gas from blocking the micropores 32.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
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 invention. 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 (6)
1. The device for protecting the temperature and pressure sensor from being corroded by fuel gas comprises a PCB (1) and a temperature and pressure sensor (2) fixed on the PCB (1) through an SMT (surface Mount technology); characterized by further comprising:
a protective cover (3); the protective cover (3) is fixed on the PCB (1) in a sealing way and covers the temperature and pressure sensor (2); an oil filling hole (31) and a micropore (32) are formed in the top wall of the protective cover (3); the protective cover (3) is internally filled with isolation oil (5);
a protective cap (4); the protective cap (4) is buckled on the protective cover (3) and is provided with a plunger (41) for blocking the oil filling hole (31);
the oil filling hole (31) is formed in the middle of the top wall of the protective cover (3); the number of the micropores (32) is a plurality, and the micropores are arranged around the oil injection holes (31);
the protective cap (4) comprises a cap body (42) and two skirt edge plates (43) symmetrically fixed on the bottom edge of the side wall of the cap body (42); the plunger (41) is formed in the center of the inner side of the top surface of the cover body (42);
an air inlet gap is formed between the side plate of the cover body (42) and the side wall of the protective cover (3).
2. A device for protecting a temperature and pressure sensor from corrosion by gas according to claim 1, characterized in that the protective cover (3) and the protective cap (4) are both made of nickel-white copper material by stretching.
3. A device for protecting a temperature and pressure sensor from corrosion by gas according to claim 1, characterized in that the isolating oil (5) is simethicone.
4. A device for protecting a temperature and pressure sensor from gas corrosion according to claim 1, characterized in that the bottom edge of the shield (3) has radially protruding annular pads (33); the annular bonding pad (33) is welded on the PCB (1) through SMT technology.
5. A device for protecting a temperature and pressure sensor from corrosion by gas according to claim 4, characterized in that the protective cover (3) has a height of 8mm, a diameter of 6mm and a thickness of 0.2mm; the outer diameter of the annular bonding pad (33) is 8.4mm.
6. A device for protecting a temperature and pressure sensor from corrosion by gas according to claim 1, characterized in that the oil filler point (31) has a diameter of 1.2mm; the diameter of the micropores (32) is 0.016mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210026199.XA CN114353849B (en) | 2022-01-11 | 2022-01-11 | Device for protecting temperature and pressure sensor from being corroded by fuel gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210026199.XA CN114353849B (en) | 2022-01-11 | 2022-01-11 | Device for protecting temperature and pressure sensor from being corroded by fuel gas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114353849A CN114353849A (en) | 2022-04-15 |
| CN114353849B true CN114353849B (en) | 2024-04-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210026199.XA Active CN114353849B (en) | 2022-01-11 | 2022-01-11 | Device for protecting temperature and pressure sensor from being corroded by fuel gas |
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| CN (1) | CN114353849B (en) |
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| DE102005053299A1 (en) * | 2005-09-14 | 2007-03-15 | Ust Umweltsensortechnik Gmbh | High-temperature housing for semiconductor gas sensors, has connectors with shaped parts located on flat ceramic base for connecting gas sensors on ceramic base, and protective ring locked with gas-permeable cap and surrounding gas sensors |
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| CN112146703A (en) * | 2020-09-21 | 2020-12-29 | 中国电子科技集团公司第三研究所 | Temperature, pressure and acoustic integrated MEMS (micro-electromechanical systems) underwater sensor and system |
| CN112188728A (en) * | 2020-09-17 | 2021-01-05 | 西安交通大学 | Temperature and pressure integrated sensor based on flip chip and packaging method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20180252693A1 (en) * | 2017-03-06 | 2018-09-06 | Honeywell International Inc. | Methods and systems for preventing damage to internal components of natural gas vehicle gas detectors |
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2022
- 2022-01-11 CN CN202210026199.XA patent/CN114353849B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005053299A1 (en) * | 2005-09-14 | 2007-03-15 | Ust Umweltsensortechnik Gmbh | High-temperature housing for semiconductor gas sensors, has connectors with shaped parts located on flat ceramic base for connecting gas sensors on ceramic base, and protective ring locked with gas-permeable cap and surrounding gas sensors |
| JP2007278872A (en) * | 2006-04-07 | 2007-10-25 | Denso Corp | Pressure sensor |
| CN203490027U (en) * | 2013-10-23 | 2014-03-19 | 湖南威铭能源科技有限公司 | Housing packaging pressure sensor for civilian gas meter |
| CN204115948U (en) * | 2014-04-30 | 2015-01-21 | 歌尔声学股份有限公司 | Pressure transducer |
| CN207730363U (en) * | 2017-12-27 | 2018-08-14 | 歌尔科技有限公司 | A kind of encapsulating structure of baroceptor |
| CN208383173U (en) * | 2018-05-17 | 2019-01-15 | 山东省水利科学研究院 | Pore water pressure temperature parameter detection system in situ |
| CN111397668A (en) * | 2020-06-03 | 2020-07-10 | 南京新力感电子科技有限公司 | Sensor core, core manufacturing and packaging method and sensor |
| CN112188728A (en) * | 2020-09-17 | 2021-01-05 | 西安交通大学 | Temperature and pressure integrated sensor based on flip chip and packaging method thereof |
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| Publication number | Publication date |
|---|---|
| CN114353849A (en) | 2022-04-15 |
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Effective date of registration: 20240304 Address after: Room 101, Building 1, No. 358 Jidao Street, Qiubin Street, Wucheng District, Jinhua City, Zhejiang Province, 321000 (self declared) Applicant after: Huasheng (Zhejiang) Measurement Technology Co.,Ltd. Country or region after: China Address before: 321023 No. 358 Jidao street, Jinhua Industrial Park, Zhejiang Province Applicant before: JINHUA LANHAI PHOTOELECTRICITY TECHNOLOGY CO.,LTD. Country or region before: China |
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