CN113776728B - Pressure transmission cavity structure for avoiding liquid low-temperature crystallization - Google Patents
Pressure transmission cavity structure for avoiding liquid low-temperature crystallization Download PDFInfo
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- CN113776728B CN113776728B CN202110861386.5A CN202110861386A CN113776728B CN 113776728 B CN113776728 B CN 113776728B CN 202110861386 A CN202110861386 A CN 202110861386A CN 113776728 B CN113776728 B CN 113776728B
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- pressure
- transmission cavity
- pressure transmission
- liquid
- chamber
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 83
- 239000007788 liquid Substances 0.000 title claims abstract description 75
- 238000002425 crystallisation Methods 0.000 title claims abstract description 12
- 230000008025 crystallization Effects 0.000 title claims abstract description 12
- 238000012546 transfer Methods 0.000 claims description 63
- 238000004381 surface treatment Methods 0.000 claims description 4
- 239000000758 substrate Substances 0.000 claims description 2
- 238000013461 design Methods 0.000 abstract description 3
- 238000001125 extrusion Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 6
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 5
- 239000004202 carbamide Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 229910002089 NOx Inorganic materials 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000011282 treatment Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L23/00—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
- G01L23/26—Details or accessories
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L23/00—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
- G01L23/24—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid specially adapted for measuring pressure in inlet or exhaust ducts of internal-combustion engines
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
A pressure transmission cavity structure for avoiding liquid low-temperature crystallization relates to a pressure sensor in an SCR system in the field of automobile parts. The structure comprises a liquid inlet throat of a pressure transmission cavity, an air throat of the pressure transmission cavity, a chamber A of the pressure transmission cavity, a chamber B of the pressure transmission cavity and a stress cavity, and the pressure transmission cavity is jointly constructed by the pressure transmission cavity, the air throat of the pressure transmission cavity and the pressure transmission cavity. The invention avoids liquid from directly entering the strain pressure cavity of the pressure sensor through the structural design of the pressure transmission cavity which is communicated with each other, avoids the damage of the strain gauge of the pressure sensor caused by the extrusion force generated by volume increase when the liquid changes phase at low temperature, and improves the adaptability of the pressure sensor to low temperature.
Description
Technical Field
The invention relates to the technical field of automobile parts, in particular to an SCR system of a commercial vehicle, and more particularly relates to a pressure sensor in the SCR system.
Background
At present, a global treatment method for NOx (nitrogen monoxide and nitrogen dioxide) harmful to automobile exhaust is a selective catalytic reduction system called SCR technology. The specific principle is that urea solution is sprayed into mist, and then mist urea particles and NOx particles in tail gas are fully mixed, harmful NOx is decomposed into N2 and water under the action of a catalyst at a certain temperature, and the N2 and the water are harmless substances in nature. The urea solution is subjected to a series of physical treatments before it is atomized, including pumping the urea solution out of a storage tank, creating a pressure in the line in front of the nozzle, and finally spraying the atomized solution through the nozzle.
The physical process is subjected to precise electromagnetic control, and the control process inevitably involves monitoring the pressure of the pipeline, so that a pressure sensor device is required.
Because urea liquid changes phase at low temperature (around-9 deg.c) to become solid crystal particles. The temperature is usually below minus 30 ℃ when the commercial vehicle stops working and is exposed on the field, the residual liquid in the pressure cavity of the pressure sensor can generate crystallization, and the volume of the crystal is increased compared with the volume of the liquid in the crystal growth process. At a fixed volume, this volume increase process can damage the pressure strain gauge, the most important component of the pressure sensor.
Disclosure of Invention
The invention mainly solves the technical problem of providing a structure which avoids that liquid directly enters a strain pressure cavity of a pressure sensor and is directly applied to a pressure strain gauge, thereby protecting the pressure strain gauge from being possibly damaged due to solid phase change of the liquid at low temperature.
In order to achieve the above purpose, the invention is realized by adopting the following specific methods:
A pressure transfer cavity structure for avoiding liquid low-temperature crystallization is characterized in that: comprising a pressure transfer chamber liquid inlet throat 1, a pressure transfer chamber air throat 2, a pressure transfer chamber a chamber 3, a pressure transfer chamber B chamber 4 and a strain pressure chamber 5, which together form a pressure transfer chamber.
The pressure transmission cavity liquid inlet throat 1 is communicated with the pressure transmission cavity A chamber 3, the pressure transmission cavity A chamber 3 is communicated with the pressure transmission cavity B chamber 4, the pressure transmission cavity B chamber 4 is communicated with the pressure transmission cavity air throat 2, the pressure transmission cavity air throat 2 is communicated with the strain pressure cavity 5, and the cavities communicated with each other in this time form a pressure transmission cavity of the pressure sensor together.
The liquid inlet throat 1 of the pressure transmission cavity is a pressure transmission inlet of the pressure transmission cavity, the opening a of the pressure transmission cavity is arranged in the liquid to be tested, and the liquid can enter the liquid inlet throat 1 of the pressure transmission cavity due to the pressure, so that the effect of leading in the liquid pressure is achieved.
Preferably, the pressure transfer chamber liquid inlet throat 1 is a cylindrical geometry channel with a channel length to diameter ratio greater than 2 and a channel diameter between 1.0 and 3.0 mm.
Preferably, the direction of the passage opening of the pressure transfer chamber liquid inlet throat 1 is maintained within +/-45 degrees of inclination from the direction of gravity. This inclination is to ensure that the air in the pressure transfer chamber, if formed in the liquid, does not escape due to buoyancy.
The pressure transfer cavity A chamber 3 is arranged behind the pressure transfer cavity liquid inlet throat 1 and is used for connecting the pressure of the pressure transfer cavity liquid inlet throat 1. When the measured liquid pressure is of a proper magnitude, the liquid passes through the liquid inlet throat 1 of the pressure transfer cavity and enters the chamber 3 of the pressure transfer cavity A.
Preferably, the pressure transfer chamber a 3 is a channel of cylindrical geometry, the volume of which needs to be large enough, which can be measured by the following calculation formula. Assuming that the volume of the pressure transmission cavity A is V1, the volume of the pressure transmission cavity B connected at the rear is V2, the volume of the pressure transmission cavity liquid inlet throat 1 is V1, the volume of the pressure transmission cavity air throat 2 is V2, and the volume of the strain pressure cavity 5 is V3, the following volume design equation can be obtained:
V1＝α(k*(V2+V3+v2))-v1
Where k is the ratio of the maximum pressure possible to the atmospheric pressure of the measured liquid and can be regarded as a fixed value. Alpha is the regulating coefficient of the height of the liquid level in the pressure transmission cavity, the value of alpha is larger than 1, and the larger the value is, the lower the height of the liquid entering the pressure transmission cavity A chamber 3 is.
The pressure transfer chamber B4 follows the pressure transfer chamber a 3 and serves to connect the pressure of the pressure transfer chamber a 3. When the measured liquid pressure is of a proper magnitude, the liquid passes through the pressure transfer chamber a 3 and enters the pressure transfer chamber B4.
Preferably, the pressure transfer chamber B4 is a channel of cylindrical geometry, the volume of which needs to be designed appropriately to ensure that liquid does not enter the pressure transfer chamber air throat 2, it can be designed by the following volume design equation:
V2= (v3+v2)/α, α is the same meaning as α, which is the adjustment coefficient of the height of the liquid level in the pressure transfer chamber, and the smaller the value of α is smaller than 1, the higher the height of the liquid entering the pressure transfer chamber B.
The final value of alpha is influenced by factors such as the overall dimension of the pressure sensor, the dimensions of all parts forming the pressure transmission cavity, the assembly structure among all parts, the required installation position of the pressure sensor, the assembly specification and the like.
Preferably, α has a value in the range of 0.1 to 1.0.
The pressure transfer chamber air throat 2 follows the pressure transfer chamber B chamber 4 and serves to connect the pressure of the pressure transfer chamber B chamber 4. When the measured liquid pressure reaches the designed maximum value, no liquid is allowed to enter the air throat 2 of the pressure transmission cavity.
Preferably, the air throat 2 of the pressure transfer chamber is a small cylindrical orifice having a diameter of less than 1.5mm and a ratio of channel length to diameter of greater than 3.
Preferably, the pressure transfer chamber air throat 2 projects downwards along its channel axis and the pressure transfer chamber liquid inlet throat 1 projects upwards along its channel axis, and the two projecting surfaces do not have an intersection at the inlet of the pressure transfer chamber air throat 2.
The strain pressure chamber 5 is arranged behind the pressure transmission chamber air throat 2, and has the functions of communicating and receiving the gas pressure of the pressure transmission chamber air throat 2 and simultaneously providing the geometric space and the area required by the pressure sensor pressure strain gauge b. Currently, pressure sensor pressure strain bridges are commercially available, and the bridge usually adopts a wafer with a diameter of about 9.50 mm.
Preferably, the geometry of the strain pressure chamber (5) is a disc-shaped structure, the diameter of the disc-shaped structure is the same as the bottom area of the pressure strain gauge, the diameter of a commercially available bridge substrate is adopted, and the thickness of the disc is between 0.15 and 0.25 mm.
The pressure transmission cavity structure has different substances contacted with the inner surfaces of the cavity bodies, the inner surfaces of the air throat 2 and the strain pressure cavity 5 of the pressure transmission cavity are only contacted with air and not contacted with the tested liquid, and the inner surfaces of the liquid inlet 1 of the pressure transmission cavity, the liquid chamber A3 of the pressure transmission cavity and the liquid chamber B of the pressure transmission cavity are contacted with the tested liquid when working, and may be contacted with the air when not working or under the condition of releasing pressure.
Preferably, the inner surface of the cavity contacted with the liquid needs to be subjected to special surface treatment to realize the hydrophilic or tested liquid-philic performance on the surface.
Preferably, the inner surface of the cavity which is not contacted with the liquid needs to be subjected to special surface treatment to realize the hydrophobicity or the hydrophobicity of the surface of the cavity to be tested.
Description of the drawings:
Fig. 1: structure of pressure transmission cavity
1: Pressure transfer chamber liquid inlet throat 2: pressure transfer chamber air throat 3: pressure transfer chamber A
4: Pressure transfer chamber B chamber 5: strain pressure chamber a: pressure transfer chamber liquid inlet throat opening b: pressure strain gage c, projection lines of air throat of pressure transmission cavity and liquid inlet throat of pressure transmission cavity in two directions
Fig. 2: explosion diagram of parts
11: Bridge securing ring 12: the strain bridge 12a: ceramic ring 12b: circuit 13: o-ring 14: pressure transfer chamber upper screw 15: o-ring II 16: pressure transfer chamber housing 17: o-shaped ring III
Fig. 3: assembly drawing
D: thread one e: thread two f: thread three G: pressure transfer chamber housing interior platform I: pressure transfer chamber upper screw platform H: two J of pressure transmission cavity shell inner platform: and a third platform is arranged inside the pressure transmission cavity shell.
Detailed Description
Examples:
The invention discloses a pressure sensor with a pressure transmission cavity structure for avoiding liquid low-temperature crystallization, and the core idea of the invention is to realize the pressure transmission cavity structure shown in fig. 1. As shown in fig. 2 and 3, the strain pressure chamber 5 of the pressure transfer chamber is realized by the upper screw 14 of the pressure transfer chamber, together with the strain bridge 12 and the pressure transfer chamber housing 16. Specifically, the lower end of the ceramic ring 12a of the strain bridge is bumped against land one G of the pressure transfer chamber housing 16 and land I of the upper pressure transfer chamber screw 14 is bumped against land two H of the pressure transfer chamber housing 16. The pressure transfer chamber upper screw 14 together with the pressure transfer chamber housing 16 define the pressure transfer chamber a chamber 3, in particular the lowermost end of the pressure transfer chamber upper screw 14 forms the pressure transfer chamber a chamber 3 with the platform three J of the pressure transfer chamber housing 16. The pressure transmission cavity upper screw 14 forms a pressure transmission cavity B chamber 4 by processing, and the liquid inlet throat 1 and the gas throat 2 are respectively realized by processing a pressure transmission cavity shell 16 and the pressure transmission cavity upper screw 14. The first O-ring 13 and the second O-ring 15 realize the sealing of the pressure transmission cavity. The strain bridge 12 is fixed by means of three f connection, and the connection and fastening of the screw rod at the upper part of the pressure transmission cavity and the pressure transmission cavity shell are realized by means of two e connection. The connection of the pressure sensor to the outside can also be achieved by means of a screw-d connection.
Claims (6)
1. A pressure transfer cavity structure for avoiding liquid low-temperature crystallization is characterized in that: the device comprises a liquid inlet throat of a pressure transmission cavity, an air throat of the pressure transmission cavity, a pressure transmission cavity A chamber, a pressure transmission cavity B chamber and a pressure application cavity; the liquid inlet throat of the pressure transmission cavity is communicated with the pressure transmission cavity A chamber, the pressure transmission cavity A chamber is communicated with the pressure transmission cavity B chamber, the pressure transmission cavity B chamber is communicated with the air throat of the pressure transmission cavity, the air throat of the pressure transmission cavity is communicated with the strain pressure cavity, and the pressure transmission cavities are jointly formed by the two communicated channels; the volume of the pressure transmission cavity A chamber channel is V1, the volume of the pressure transmission cavity B chamber channel is V2, and the quantity relation between the V1 and the V2 satisfies the following equation:
V1＝α(k*(V2+V3+v2))-v1
V2＝(V3+v2)/α
Wherein,
V3 is the pressure strain chamber volume,
V1 is the passage volume of the liquid inlet throat of the pressure transfer chamber,
V2 is the passage volume of the air throat of the pressure transfer chamber,
K is the ratio of the maximum pressure possible to the atmospheric pressure of the liquid to be measured; alpha is an adjusting coefficient of the liquid level height of the liquid in the pressure transmission cavity, and the value is between 0.1 and 1.0; in operation, the air throat of the pressure transmission cavity and the inner surface of the strain pressure cavity are not allowed to contact the measured liquid.
2. A pressure transfer chamber structure for circumventing liquid low temperature crystallization as claimed in claim 1, wherein: the front end of the pressure transmission cavity is provided with a liquid inlet throat of the pressure transmission cavity, the liquid inlet throat of the pressure transmission cavity is a channel with a cylindrical geometric structure, the ratio of the length to the diameter of the channel is more than 2, the diameter of the channel is between 1.0 and 3.0mm, and the center axis of the channel is in the same direction as the direction of gravitational attraction in the direction of the liquid inlet and is kept within an included angle range of +/-45 degrees.
3. A pressure transfer chamber structure for circumventing liquid low temperature crystallization as claimed in claim 1, wherein: the pressure transfer cavity A is a channel with a cylindrical geometric structure, the diameter of the channel is D1, the volume of the channel is V1, the pressure transfer cavity B is a channel with a cylindrical geometric structure, the diameter of the channel is D2, the volume of the channel is V2, and D1 is larger than D2,
V1 is greater than V2.
4. A pressure transfer chamber structure for circumventing liquid low temperature crystallization as claimed in claim 1, wherein: the air throat of the pressure transmission cavity is a small hole with a cylindrical shape, the diameter of the small hole is smaller than 1.5mm, and the ratio of the channel length to the diameter is larger than 3; the pressure transmission cavity air throat projects downwards along the channel axis and the pressure transmission cavity liquid inlet throat projects upwards along the channel axis, and the projection surfaces of the pressure transmission cavity air throat and the pressure transmission cavity liquid inlet throat do not have intersection at the inlet of the pressure transmission cavity air throat.
5. A pressure transfer chamber structure for circumventing liquid low temperature crystallization as claimed in claim 1, wherein: the strained pressure chamber follows the air throat of the pressure transfer chamber: the geometry of the strain pressure chamber is a disc-shaped structure, the diameter of the strain pressure chamber is the same as the bottom area of the pressure strain substrate, the size of the commercial bridge is adopted, and the thickness of the disc is between 0.15 and 0.25 mm.
6. A pressure transfer chamber structure for circumventing liquid low temperature crystallization as claimed in claim 1, wherein: the air throat of the pressure transmission cavity and the inner surface of the strain pressure cavity need to be subjected to surface treatment to realize the hydrophobicity or the hydrophobicity of the liquid to be tested; the inner surfaces of the liquid inlet throat of the pressure transmission cavity, the liquid inlet throat of the pressure transmission cavity A and the liquid inlet throat of the pressure transmission cavity B need to be contacted with the tested liquid, and surface treatment needs to be carried out to realize the hydrophilic property or the property of the tested liquid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110861386.5A CN113776728B (en) | 2021-09-17 | 2021-09-17 | Pressure transmission cavity structure for avoiding liquid low-temperature crystallization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110861386.5A CN113776728B (en) | 2021-09-17 | 2021-09-17 | Pressure transmission cavity structure for avoiding liquid low-temperature crystallization |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113776728A CN113776728A (en) | 2021-12-10 |
| CN113776728B true CN113776728B (en) | 2024-06-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110861386.5A Active CN113776728B (en) | 2021-09-17 | 2021-09-17 | Pressure transmission cavity structure for avoiding liquid low-temperature crystallization |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5307684A (en) * | 1992-06-02 | 1994-05-03 | Viatran Corporation | Stop mechanism for a diaphragm pressure transducer |
| CN105351052A (en) * | 2015-11-24 | 2016-02-24 | 天津星洁汽车排放控制***有限公司 | Structure for preventing pump from being damaged by liquid freezing in pump in SCR (Selective Catalytic Reduction) system |
| CN107290099A (en) * | 2016-04-11 | 2017-10-24 | 森萨塔科技公司 | Pressure sensor, the plug for pressure sensor and the method for manufacturing plug |
| CN207114088U (en) * | 2017-07-07 | 2018-03-16 | 西安秦泰汽车排放技术有限公司 | A kind of anti-cold pressure sensor for freezing ice damage |
| CN108362433A (en) * | 2018-04-15 | 2018-08-03 | 无锡盛赛传感科技有限公司 | A kind of encapsulating structure of anti-freeze type ceramic pressure sensor |
| CN109341939A (en) * | 2018-12-13 | 2019-02-15 | 广东浪淘砂新型材料有限公司 | A kind of defroster of hydrostatic sensor |
| CN110702300A (en) * | 2019-10-17 | 2020-01-17 | 山东钢铁集团日照有限公司 | Pressure transmission device based on extensible flexible material and working method |
| CN112304474A (en) * | 2019-12-04 | 2021-02-02 | 武汉飞恩微电子有限公司 | Pressure sensor |
-
2021
- 2021-09-17 CN CN202110861386.5A patent/CN113776728B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5307684A (en) * | 1992-06-02 | 1994-05-03 | Viatran Corporation | Stop mechanism for a diaphragm pressure transducer |
| CN105351052A (en) * | 2015-11-24 | 2016-02-24 | 天津星洁汽车排放控制***有限公司 | Structure for preventing pump from being damaged by liquid freezing in pump in SCR (Selective Catalytic Reduction) system |
| CN107290099A (en) * | 2016-04-11 | 2017-10-24 | 森萨塔科技公司 | Pressure sensor, the plug for pressure sensor and the method for manufacturing plug |
| CN207114088U (en) * | 2017-07-07 | 2018-03-16 | 西安秦泰汽车排放技术有限公司 | A kind of anti-cold pressure sensor for freezing ice damage |
| CN108362433A (en) * | 2018-04-15 | 2018-08-03 | 无锡盛赛传感科技有限公司 | A kind of encapsulating structure of anti-freeze type ceramic pressure sensor |
| CN109341939A (en) * | 2018-12-13 | 2019-02-15 | 广东浪淘砂新型材料有限公司 | A kind of defroster of hydrostatic sensor |
| CN110702300A (en) * | 2019-10-17 | 2020-01-17 | 山东钢铁集团日照有限公司 | Pressure transmission device based on extensible flexible material and working method |
| CN112304474A (en) * | 2019-12-04 | 2021-02-02 | 武汉飞恩微电子有限公司 | Pressure sensor |
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| CN113776728A (en) | 2021-12-10 |
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