CN107064000B - Turbulence-preventing scale-reducing structure and optical liquid concentration testing device - Google Patents
Turbulence-preventing scale-reducing structure and optical liquid concentration testing device Download PDFInfo
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- G—PHYSICS
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- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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Abstract
The invention discloses a turbulent flow protection device and a scale reduction device of an optical liquid concentration sensor, comprising an outer ring column, an inner ring column, a top cover, an incident surface, a reflecting surface and an emergent surface; the scheme also discloses an optical liquid concentration testing device comprising the turbulence protection device and the scale reduction device. The solution can reduce, dredge and release bubbles in the tested solution to the greatest extent by providing a relatively static environment, so that the test reliability is improved. On the other hand, the scale reducing structure of the optical component of the optical liquid concentration sensor device guides the dirt on the emergent surface and the incident surface of the sensor caused by long-term use, impurity precipitation and electrostatic action, and delays the deposition of the dirt on the effective areas of the emergent surface and the incident surface as much as possible, thereby avoiding the formation of halation and improving the detection precision of the sensor. In addition, this scheme is through providing an optical liquid concentration testing arrangement, effectively protects the sensor main part, prolongs life-span, improves the precision simultaneously.
Description
Technical Field
The invention relates to the technical field of sensors, in particular to a sensor device, a turbulence protection device and a sensor test device for reducing a scale formation structure in the sensor device, further relates to a sensor device, a turbulence protection device and a sensor test device for reducing a scale formation structure in the sensor device and a liquid concentration mass sensor in a liquid concentration sensor, and further relates to a sensor device, a turbulence protection device and a sensor test device for reducing a scale formation structure in the sensor device and an optical liquid concentration mass sensor in an optical liquid concentration sensor.
Technical Field
Diesel engines are widely used in various industries with higher horsepower. Compared with a gasoline engine, the diesel oil has high generation and emission of nitrogen oxides due to high temperature in a cylinder body, which always puzzles the industry. As the environmental protection requirement is improved year by year, the emission standard of the engine is regulated by successive legislation in all countries of the world, and the research of the tail gas treatment technology of engine manufacturers in all countries is promoted.
At present, china has forced the use of national IV standard engines and is matched with corresponding tail gas treatment technology. Among the most dominant technological routes worldwide are SCR selective catalytic reduction-SelectedCrystal Reduction and egr+dpf technologies, which in turn are most mature and widespread with SCR. The technical route of SCR system is selected by several large engine manufacturers in China, and chemical substances are utilized to react with the exhaust emission substances of the engine so as to generate substances harmless to human bodies. Urea or urea-based solutions are often used in automotive applications to reduce emissions of harmful substances in the exhaust gases of automobiles, the main component of which is nitrogen oxides.
The chemical reaction equation is as follows: NOx+NH 3 →N 2 +H 2 O(N 2 And H 2 O is a harmless substance in the natural air).
The SCR system comprises a urea tank loaded with diesel engine tail gas treatment liquid and an SCR catalytic reaction tank. The operation process of the SCR system is as follows: when nitrogen oxides exist in the exhaust pipe, the urea tank automatically sprays diesel engine tail gas treatment liquid, the diesel engine tail gas treatment liquid and the nitrogen oxides undergo oxidation-reduction reaction in the SCR catalytic reaction tank, and pollution-free nitrogen and water vapor are generated and discharged.
With the full implementation of the national four standards or higher for the exhaust emission of automobiles, all heavy commercial vehicles must be in terms of SCR systems or equivalent exhaust aftertreatment devices, whereas most host factories in China prefer SCR systems, and thus must use urea for the vehicle. In the use process of urea, a certain concentration range must be maintained so as to fully convert nitrogen oxides in the tail gas into water and nitrogen. The concentration of urea in the urea solution for the vehicle is too high, insufficient reaction can occur, and secondary NH3 pollution is caused; the urea concentration is too low to meet the emission standard.
In the future, with the forced execution of the OBD vehicle-mounted diagnosis system, the vehicle can be limited in torque and even limited in starting when the emission does not reach the standard or if the diesel engine tail gas treatment liquid is not loaded, or the purity is insufficient, or the quality is poor, and the automatic deceleration of the vehicle engine can occur. Meanwhile, the diesel engine tail gas treatment liquid with poor quality can pollute the catalyst in the SCR catalytic reaction tank, and serious consequences are caused. Therefore, with the implementation of state six, the urea concentration sensor becomes a forced execution means.
The prior art discloses a sensor for measuring the concentration of a liquid comprising:
a light source generator, a light source is focused and is emitted to one side of a cavity of a solution.
The optical device is integrally processed by the optical component, on one hand, the light source transmits the tested liquid according to a specified direction; on the other hand, the transmitted light is turned again as prescribed by the optical member. Therefore, through the planning of the optical component, the incidence and the emergent control of light are realized, and a needed light path is formed.
The photodetector recognizes the light transmission characteristic at the end of the optical path, and converts the light transmission characteristic.
A system controller comprising software and hardware corresponding to the conversion and encoding of the electrical signals; interface configuration and communication protocol operation.
Through the cooperation of the above components, the concentration of the solution within the sensor device cavity can be determined in real time.
The above-mentioned sensor for measuring the concentration of the liquid can measure the concentration of urea, but the device cannot eliminate factors affecting the measurement accuracy and stability during the measurement, such as turbulence during the measurement and bubbles due to turbulence, added liquid impact, etc.; scale formed by long-term sedimentation of liquid on the emergent surface and the incident surface. Because the bubbles directly affect the direction of the light path and the scattering of the light, and the generation of scale causes halation when the light exits to the end point, both the scattering and the halation cause inaccurate measurement. Thus, the urea solution concentration measurement result obtained by the scheme is low in accuracy and reliability.
Disclosure of Invention
One object of the present invention is to: the turbulence protection device and the bubble dredging device for the optical liquid concentration sensor are provided, and impact turbulence of the sensor, which is formed by liquid vibration and impact caused in the running process of a vehicle and the solution adding process, is inhibited, so that a relatively static environment is provided, bubbles in the measured solution can be reduced, dredged and released to the greatest extent, and the test reliability of the sensor is improved.
Another object of the invention is: the turbulence protection device for the optical liquid concentration sensor is provided, and a relatively static environment is provided for inhibiting impact turbulence formed by liquid vibration and impact caused by the sensor in the running process of a vehicle and the solution adding process, so that disturbance caused by turbulence of the liquid to be tested is inhibited, the probability that particles or impurities in the liquid enter a detected area of the sensor device is reduced, further, excessive accumulation of impurities on an incident surface and an emergent surface of light in the liquid is reduced, and the test life of the sensor device is prolonged.
Yet another object of the present invention is: the scale-reducing structure of the optical component of the optical liquid concentration sensor device is provided, and the scale of the emergent surface and the incident surface of the sensor device, which is caused by long-term use, impurity precipitation and electrostatic action in the liquid, is guided, so that the deposition of the scale on the effective areas of the emergent surface and the incident surface in the liquid of the sensor device is delayed as much as possible, thereby avoiding the formation of halation and improving the detection precision of the sensor.
A further object of the invention is: an optical liquid concentration test device is provided, which effectively protects a sensor main body, the service life of the sensor main body is prolonged, and meanwhile, the accuracy of the sensor is improved.
In order to achieve the above purpose, the invention adopts the following technical scheme:
in one aspect of the present invention, an optical concentration sensor turbulence preventing apparatus, referred to as a turbulence preventing apparatus 10, includes an outer annular column 14 for isolating turbulence, an inner annular column 13 for protecting a measured liquid from being stationary, and a top cover 18 for connecting the outer annular column and the inner annular column.
The outer ring column 14 is provided with a liquid inlet 11 near the top cover 18;
the outer ring column 14 is designed with an annular platform 19 at the bottom for mounting the optical component 20, which serves on the one hand to limit and fix the position of the optical component 20 and on the other hand to allow the limiting platform 25 of the optical component 20 to form an access channel for the solution to be tested with the bottom of the inner ring column 13.
Specifically, the annular platform and the limiting platform are locked with the turbulence protective cover through the bottom precise assembly bracket 40.
The above-described inlet channel design of the solution under test achieves a buffer sensor device external turbulence:
preferably, the top opening of the outer ring column 14 is called a liquid inlet 11, and forms an included angle with the axial direction of the outer ring column 14 to redirect liquid;
preferably, the gap between the outer ring column 14 and the inner ring column 13 forms an included angle with the liquid inlet 11 to redirect the liquid;
preferably, the loop column gap 12 again forms an angle with the bottom passageway 110 to redirect the liquid once again;
preferably, the design of the liquid inlet 11 is far away from the measured solution section of the optical path; thus, the distance that the measured solution enters the channel and reaches the area where the measured light path is located is the farthest, and the turbulence can be furthest isolated.
The outer ring post 14 maintains a radial seal with the sensor device optic 20 at the middle of the post for the purpose of protecting the electronics at the bottom of the optic 20 from solution and protecting the entire sensor.
Specifically, the optical component 20 is provided with a groove 24 on the side surface, which is matched with a sealing ring 30, and the sealing ring 30 is sleeved at the groove 24.
Preferably, the optic 20 has a circular waisted shape to facilitate placement of the circular seal 30.
The top cover 18 of the turbulence preventing device is provided with small holes 17, small hole areas 15 and buffer spokes 16:
preferably, the material thickness of the small hole area 15 in the top cover 18 portion is required to be relatively slightly thinner than in other areas to form a pit for the purpose of facilitating the accumulation of gas therein;
preferably, the inside of the non-porous region cap has a higher finish, facilitating rapid migration of bubbles to the porous region 15;
preferably, the thickness of the wall of the cap 18 is non-uniform in the radial direction from the orifice region 15, progressively thicker, for the purpose of providing a guide for migration of bubbles in the liquid under gravity, like the bubble level principle: bubbles migrate from the front light path through the liquid test zone to the rear aperture zone 15;
as a preferred option, the buffer spokes 16 are wrapped around the aperture area 15, and are blocked in front of the aperture area 15. At the proximal end adjacent the aperture area 15, a tip 111 is provided for the purpose of buffering the impact of turbulence of the liquid outside the sensor device on the area of the liquid to be measured through the cap aperture 17, while facilitating the directional migration of bubbles in the liquid into the aperture area.
Preferably, the knife tips 111 on the cushion spokes 16 are designed to facilitate release of bubbles there.
In another aspect of the present invention, an optical body member of an optical liquid concentration sensor apparatus is provided, forming an optical path and a scale-reducing device, referred to as an optical member 20.
In one aspect, the optical path is comprised of a number of optical entrance, exit, and reflective surfaces.
Specifically, the light path is composed of the following structures: a first entrance surface 51, a first reflection surface 52, a first exit surface 53, a second entrance surface 54, a second reflection surface 55, and a second exit surface 56.
Preferably, the first incident surface 51 is a highly polished surface, which reduces scattering of light and improves detection accuracy;
preferably, the first incident surface 51 is a height plane, so that the light deviation is reduced, and the detection accuracy is improved;
preferably, the first reflecting surface 52 is a highly polished surface, which reduces scattering of light and improves the test accuracy;
preferably, the first reflecting surface 52 is highly planar, reducing the offset of light and improving the detection accuracy;
preferably, the first exit surface 53 is a highly polished surface, which reduces scattering of light and improves the test accuracy;
preferably, the first exit surface 53 is highly planar, reducing light offset and improving detection accuracy;
preferably, the second incident surface 54 is a highly polished surface, which reduces scattering of light and improves detection accuracy;
preferably, the second incident surface 54 is highly planar, reducing light offset and improving detection accuracy;
preferably, the second reflecting surface 55 is a highly polished surface, which reduces scattering of light and improves the test accuracy;
preferably, the second reflecting surface 55 is highly planar, reducing the offset of light and improving the detection accuracy;
preferably, the second exit surface 56 is a highly polished surface, which reduces scattering of light and improves the test accuracy;
preferably, the second exit surface 56 is highly planar, reducing light offset and improving detection accuracy;
in another aspect, a scale-reducing structure comprises: a first exit surface 53, a second entrance surface 54, a rapid-decrease curved surface 21, a deposition bath 22, and a deposition hole 23.
Preferably, the first exit surface 53 and the second entrance surface 54 are polished surfaces, and are highly polished surfaces.
The high polishing of the polished surface has repulsive action on dirt and delays the generation of dirt.
Specifically, the rapid-decrease curved surface 21 is a curved surface connected between the first exit surface and the second entrance surface and the lower deposition groove 22.
Preferably, the speed bump surface 21 is a generally polished surface of a generally lower finish than the light incident and exiting surfaces, such as the first and second exiting surfaces 53, 54 having a higher finish, referred to as a high polished surface; the purpose is to attract dirt to the surface 21 and gradually transfer it to the deposition bath 22, thereby protecting the highly polished surface from dirt deposition. Improving the test accuracy and extending the useful life of the optical component 20.
Specifically, the deposition bath 22 is a basin-like structure connected to the lower portion of the rapid-lowering curved surface 21.
Preferably, the bottom plane of the basin is a non-polished surface, a certain roughness is needed, the adsorption and deposition of micro foreign matters or impurities are kept, the deposition of dirt on the polished surface at the upper end is ensured to be as little as possible, and the functions of ensuring the precision and prolonging the service life are achieved.
Specifically, the deposition holes 23 are connected to the bottom plane of the deposition bath 22.
Preferably, the deposition hole 23 is a blind hole, the bottom of the hole is small and the upper face is large. The purpose is to prevent the large granular foreign matters from damaging the detection reliability in the test area for the deposition of larger granular matters.
The beneficial effects of the invention are as follows:
the turbulence protection device for the optical liquid concentration sensor is capable of performing turbulence isolation on the part of the liquid to be measured in the sensor device, providing a static test environment, avoiding the influence of jolt and liquid addition in the running process of a vehicle, being capable of sampling in all time segments and all links, and outputting a reliable result.
And secondly, the turbulence protection device of the optical liquid concentration sensor is provided, turbulence isolation is carried out on the part of the detected liquid in the sensor device, and meanwhile, the directional migration and the dispersion of bubbles are provided through the cooperation of the leading-out small holes 17 of the top cover 18 of the turbulence device and the buffer spokes 16, so that the situation that bubbles are mixed in the detected liquid, and the unreliable detection result or the influence on the detection precision is caused is avoided.
And thirdly, providing a turbulence protection device of the optical liquid concentration sensor, and simultaneously isolating turbulence and dredging bubbles, and providing a sealing environment between the outer ring column 14 and the optical component 20 of the sensor device, wherein the sealing environment protects the electronic circuit of the sensor, so that the service life of the sensor is ensured.
And (IV) providing a turbulence protection device for an optical liquid concentration sensor, specifically, providing a mounting annular platform 19 of an optical component 20 of the sensor device on the inner side of the outer ring column 14, integrating the optical path design and detection and protection functions of one of the core functions of the sensor device, and for the optical component 20 with higher mounting accuracy requirement, realizing effective protection, placement and positioning of the optical component 20 of the sensor device by an integrated simple turbulence device, so that the testing process is stable and reliable and the accuracy is ensured.
And fifthly, the optical component 20 of the sensor device of the optical concentration sensor, preferably in a round waisted design, is convenient to be provided with a groove 24 for sealing, and forms a sealing structure with the outer ring post 14 of the turbulence device through a sealing ring 30. The sealing structure provides working and storage environment for the electronic circuit of the sensor, and simultaneously realizes miniaturization and integration of the sensor, so that the sensor device and the control part can be combined together in a concentrated way.
The optical component 20 of the sensor device of the optical concentration sensor is provided, and the preferable design of the deposition groove 22 and the deposition hole 23 is that the deposition effect is relatively realized on large particle impurities or sediments in the solution, so that the uncertainty of detection is avoided, and the test result is reliable.
(seventh) providing a sensor device optic 20 of an optical concentration sensor, preferably a highly polished surface immersed in the liquid being measured, comprising a first exit surface 53 and a second entrance surface 54, being of an anti-fouling design; the rapid-falling curved surface 21 is designed for a low polished surface; the specially designed device plays a role in guiding and settling dirt in the solution, so that dirt on the polished surface is relatively difficult and slow to collect, and the rapid degradation curved surface 21 and the sedimentation tank 22 are relatively easy to collect dirt. Dirt is a main noise source of optical detection accuracy, and transmission scattering is generated, so that halation is finally formed, and the detection accuracy is affected.
Drawings
The invention is described in further detail below with reference to the accompanying drawings and examples.
FIG. 1 is an assembly diagram of an optical liquid concentration test apparatus according to one, two and three embodiments;
FIG. 2 is a cross-sectional view of the test area of the optical liquid concentration test apparatus according to the first, second and third embodiments;
FIG. 3 is a cross-sectional view of a top cover of an optical liquid concentration test apparatus according to one, two or three embodiments;
FIG. 4 is a cross-sectional view of a top cover of an optical liquid concentration test apparatus according to an embodiment;
FIG. 5 is a cross-sectional view showing a top cover layout of an optical liquid concentration test apparatus according to a second embodiment;
FIG. 6 is a cross-sectional view showing a top cover layout of an optical liquid concentration test apparatus according to a third embodiment;
FIG. 7 is a cross-sectional view of an optical component of an optical liquid concentration test apparatus according to the first and second embodiments;
FIG. 8 is a cross-sectional view of an optical component of an optical liquid concentration test apparatus according to a third embodiment;
FIG. 9 is a top view of an optical component of an optical liquid concentration measuring apparatus according to one or two embodiments
FIG. 10 is a top view of an optical component of an optical liquid concentration test apparatus according to a third embodiment
FIG. 11 is an incident and emergent view of an optical component of the optical liquid concentration test apparatus according to the first, second and third embodiments;
FIG. 12 is an overall view of the optical components of the optical liquid concentration test apparatus according to the first, second and third embodiments;
in fig. 1 to 12:
10. turbulence protection cover: 11. a liquid inlet; 12. a loop column gap; 13. an inner ring column; 14. an outer ring column; 15. a small hole region; 16. a buffer spoke; 17. a small hole; 18. a top cover; 19. an annular platform; 110. a bottom liquid passage; 111. a knife tip;
20. an optical component; 21. a rapid-falling curved surface; 22. a deposition tank; 23. a deposition hole; 24. a groove; 25. a limiting platform;
30. a seal ring;
40. assembling a bracket;
51. a first incident surface; 52. a first reflecting surface; 53. a first exit surface; 54. a second incident surface; 55. a second reflecting surface; 56. and a second exit surface.
Detailed Description
The technical scheme of the invention is further described below by the specific embodiments with reference to the accompanying drawings.
Embodiment one:
as shown in fig. 1 to 3, an optical liquid concentration sensor includes a turbulence guard 10, a sensor device optical member 20, a seal ring 30, and an assembly bracket 40. The turbulence hood 10 is connected to the assembly bracket 40 by fasteners. The optical component 20 is locked by an assembly bracket in the turbulence hood 10 through the annular platform 19 of the outer ring post 14 and the limit platform 25 of the optical component.
The turbulence hood 10 is designed as an integrated engineering plastic part, the liquid inlet 11 of which is formed in one piece with the annular column gap 12. Specifically, the liquid inlet 11 is designed at a remote end from the liquid test zone where the sensor is to be tested. After the optical component 20 and the turbulence protective cover 10 are locked by the fastening piece, the inner ring post 13 of the turbulence protective cover and the limit platform 25 of the optical component 20 form a liquid bottom passage 110 for the liquid to be tested to enter the detection area, so that a complete passage for the liquid to be tested of the whole turbulence protective cover 10 to enter the sensor device detection area is formed, and the liquid passage realizes the protection and isolation effects on external turbulence.
As shown in fig. 11 and 12, the bottom of the optical component 20 is an incident start point and an exit end point of the optical path, and has a first incident surface 51 and a second exit surface 56; a polishing surface is arranged in the measured liquid area, and the polishing surface is also a first light path emergent surface 53 and a second light path incident surface 54; the optical member 20 has two reflective surfaces, a first reflective surface 52 and a second reflective surface 55, respectively. The optical surface requirements on these paths are: first, ultra-high finish; second, ultra-high precision. The shape and dimensional accuracy and finish of the optical component 20 can be integrally achieved in an industrial implementation by developing a precision mold.
As shown in fig. 2 and 4, the top of the turbulence protecting cover 10 is a top cover 18; the top cover 18 is provided with a bubble leading-out small hole 17; the area where the small hole 17 is located is a concave small area, which is called a small hole area 15; the small hole area 15 is thinner in material wall thickness than the other areas of the top cover 18, which is achieved when the turbulence hood 10 is formed in one piece. The small holes 17 can be formed in two ways, namely, the turbulent flow protective cover 10 can be formed at one time, and the turbulent flow protective cover can be processed after being formed; two buffer spokes 16 are designed between the small hole area 15 and the measured solution side on the top cover 18, the two buffer spokes 16 are separated to form an opening in the middle of the small hole area 15, and the buffer spokes 16 form acute angle knife tips 111 at the opening of the end part, so that bubbles can be conveniently released and guided into the small hole area 15; the direction of the buffer spoke 16 is a mode of surrounding the small hole area 15, the direction of the spoke knife tip 111 points to the measured solution area, and the other end is close to the small hole area. In other examples, the buffer spokes 16 are oriented to reverse the direction of the solution region being tested. The example 2 buffer spokes 16 were also formed in a one-shot injection molding manner.
As shown in fig. 7 and 12, the optical component 20 forms a multi-layered curved arrangement in the solution area to be measured. The two polished surfaces 53, 54 are realized by polishing at the light path exit and entrance surfaces. Firstly, the transmitted light is ensured not to be scattered, so that the test precision is improved; secondly, the surface finish is ensured, so that dirt accumulation on the functional surface is prevented and delayed, scale is formed, and the measurement accuracy is affected. The lower edges of the polishing surfaces 53 and 54 are the rapid-falling curved surfaces 21 tangent to the polishing surfaces 53 and 54, the rapid-falling curved surfaces 21 are designed into a 3-section cambered surface structure, and the cambered surfaces have the functions of relieving the curves and facilitating impurities or large particles in the liquid to fall along the arc lines compared with non-tangent planes. The realization of the cambered surface is realized through one-step molding of an industrial die as well as the realization of the light path, but the requirements on the size, the shape precision and the surface finish are not high, and the realization is easier. In particular, different metal working techniques may be used for different dimensional requirements and different polishing processes may be used for different finish requirements. In the lower portion of the rapid-decrease curved surface 21, there are a deposition groove 22 and a deposition hole 23. The deposition bath 22 and the deposition hole 23 are formed into a structure with a small bottom and a large top, which is more convenient for drawing in the mold forming. Meanwhile, the requirements for the surface finish of the inner walls of the deposition bath 22 and the deposition holes 23 are contrary to the requirements for the upper polished surfaces 53, 54 thereof, and a dense surface roughening treatment is required, which can still be achieved by a special polishing process.
As shown in fig. 7 and 9, the optical member 20 forms a scale-reducing structure in the region of the solution to be measured, and particularly forms a deposition hole 23 at the bottom of the deposition bath 22. In this example, the deposition aperture 23 may be a circular cone structure.
Embodiment two:
as shown in fig. 1 to 3, an optical liquid concentration sensor includes a turbulence guard 10, a sensor device optical member 20, a seal ring 30, and an assembly bracket 40. The turbulence hood 10 is connected to the assembly bracket 40 by fasteners. The optical component 20 is locked by an assembly bracket in the turbulence protective cover 10 through the annular platform 19 of the outer ring post 14 and the limit platform 25 of the optical component 20.
The turbulence hood 10 is designed as an integrated engineering plastic part, the liquid inlet 11 of which is formed in one piece with the annular column gap 12. Specifically, the liquid inlet 11 is designed at a remote end from the liquid test zone where the sensor is to be tested. After the optical component 20 and the turbulence protective cover 10 are locked by the fastening piece, the inner ring post 13 of the turbulence protective cover and the limit platform 25 of the optical component 20 form a liquid bottom passage 110 for the liquid to be tested to enter the detection area, so that a complete passage for the liquid to be tested of the whole turbulence protective cover 10 to enter the sensor device detection area is formed, and the liquid passage realizes the protection and isolation effects on external turbulence.
As shown in fig. 11 and 12, the bottom of the optical component 20 is an incident start point and an exit end point of the optical path, and has a first incident surface 51 and a second exit surface 56; a polishing surface is arranged in the measured liquid area, and the polishing surface is also a first light path emergent surface 53 and a second light path incident surface 54; the optical member 20 has two reflective surfaces, a first reflective surface 52 and a second reflective surface 55, respectively. The optical surface requirements on these paths are: first, ultra-high finish; second, ultra-high precision. The shape and dimensional accuracy and finish of the optical component 20 can be integrally achieved in an industrial implementation by developing a precision mold.
As shown in fig. 2 and 5, the top of the turbulence protecting cover 10 is a top cover 18; the top cover 18 is provided with a bubble leading-out small hole 17; the small hole area 15 is a concave small area, which is called a small hole area 15; the small hole area 15 is thinner in material wall thickness than the other areas of the top cover 18, which is achieved when the turbulence hood 10 is formed in one piece. The small holes 17 can be formed in two ways, namely, the turbulent flow protective cover 10 can be formed at one time, and the turbulent flow protective cover can be processed after being formed; two buffer spokes 16 are designed between the small hole area 15 and the measured solution side on the top cover 18, the two buffer spokes 16 are separated to form an opening in the middle of the small hole area 15, and the buffer spokes 16 form acute angle knife tips 111 at the opening of the end part, so that bubbles can be conveniently released and guided into the small hole area 15; the direction of the buffer spoke 16 is designed to reversely surround the measured solution area, the direction of the cutter tip is close to the small hole area, and the other end is far away from the small hole area. In other examples, the buffer spokes 16 may be in the form of a plurality of buffer spokes, and the direction may be designed to surround the solution area to be measured in the opposite direction or may be designed to surround the small hole area. The example 2 buffer spokes 16 were also formed in a one-shot injection molding manner.
As shown in fig. 7 and 12, the optical component 20 forms a multi-layered curved arrangement in the solution area to be measured. The two polished surfaces 53, 54 are realized by polishing at the light path exit and entrance surfaces. Firstly, the transmitted light is ensured not to be scattered, so that the test precision is improved; secondly, the surface finish is ensured, so that dirt accumulation on the functional surface is prevented and delayed, scale is formed, and the measurement accuracy is affected. The lower edges of the polishing surfaces 53 and 54 are the rapid-falling curved surfaces 21 tangent to the polishing surfaces 53 and 54, the rapid-falling curved surfaces 21 are designed into a 3-section cambered surface structure, and the cambered surfaces have the functions of relieving the curves and facilitating impurities or large particles in the liquid to fall along the arc lines compared with non-tangent planes. The realization of the cambered surface is realized through one-step molding of an industrial die as well as the realization of the light path, but the requirements on the size, the shape precision and the surface finish are not high, and the realization is easier. In particular, different metal working techniques may be used for different dimensional requirements and different polishing processes may be used for different finish requirements. In the lower portion of the rapid-decrease curved surface 21, there are a deposition groove 22 and a deposition hole 23. The deposition bath 22 and the deposition hole 23 are formed into a structure with a small bottom and a large top, which is more convenient for drawing in the mold forming. Meanwhile, the requirements for the surface finish of the inner walls of the deposition bath 22 and the deposition holes 23 are contrary to the requirements for the upper polished surfaces 53, 54 thereof, and a dense surface roughening treatment is required, which can still be achieved by a special polishing process.
As shown in fig. 7 and 9, the optical member 20 forms a scale-reducing structure in the region of the solution to be measured, and particularly forms a deposition hole 23 at the bottom of the deposition bath 22. In this example, the deposition aperture 23 may be a circular cone structure.
Embodiment III:
as shown in fig. 1 to 3, an optical liquid concentration sensor includes a turbulence guard 10, a sensor device optical member 20, a seal ring 30, and an assembly bracket 40. The turbulence hood 10 is connected to the assembly bracket 40 by fasteners. The optical component 20 is locked by an assembly bracket in the turbulence protective cover 10 through the annular platform 19 of the outer ring post 14 and the limit platform 25 of the optical component 20.
The turbulence hood 10 is designed as an integrated engineering plastic part, the liquid inlet 11 of which is formed in one piece with the annular column gap 12. Specifically, the liquid inlet 11 is designed at a remote end from the liquid test zone where the sensor is to be tested. After the optical component 20 and the turbulence protective cover 10 are locked by the fastening piece, the inner ring post 13 of the turbulence protective cover and the limit platform 25 of the optical component 20 form a liquid bottom passage 110 for the liquid to be tested to enter the detection area, so that a complete passage for the liquid to be tested of the whole turbulence protective cover 10 to enter the sensor device detection area is formed, and the liquid passage realizes the protection and isolation effects on external turbulence.
As shown in fig. 11 and 12, the bottom of the optical component 20 is an incident start point and an exit end point of the optical path, and has a first incident surface 51 and a second exit surface 56; a polishing surface is arranged in the measured liquid area, and the polishing surface is also a first light path emergent surface 53 and a second light path incident surface 54; the optical member 20 has two reflective surfaces, a first reflective surface 52 and a second reflective surface 55, respectively. The optical surface requirements on these paths are: first, ultra-high finish; second, ultra-high precision. The shape and dimensional accuracy and finish of the optical component 20 can be integrally achieved in an industrial implementation by developing a precision mold.
As shown in fig. 2 and 6, the top of the turbulence protecting cover 10 is a top cover 18; the top cover 18 is provided with a bubble leading-out small hole 17; the small hole area 15 is a concave small area, which is called a small hole area 15; the small hole area 15 is thinner in material wall thickness than the other areas of the top cover 18, which is achieved when the turbulence hood 10 is formed in one piece. The small holes 17 can be formed in two ways, namely, the turbulent flow protective cover 10 can be formed at one time, and the turbulent flow protective cover can be processed after being formed; 4 buffer spokes 16 are arranged between the small hole area 15 and the measured solution side on the top cover 18, the 4 buffer spokes 16 are separated in the middle of the small hole area 15 to form openings, and sharp-angle knife tips 111 are formed at the openings at the end parts of the 4 buffer spokes 16, so that bubbles can be conveniently released and guided into the small hole area 15; the direction of the 4 buffer spokes 16 is designed to reversely surround the measured solution area, the direction of the cutter tip is close to the small hole area, and the other end is far away from the small hole area. In other examples, the buffer spokes 16 may be in the form of 2 buffer spokes, and the direction may be designed to surround the measured solution area in the opposite direction or may be designed to surround the small hole area. The example 4 cushion spokes 16 are also formed in a one-shot injection molding manner.
As shown in fig. 8 and 12, the optical component 20 forms a multi-layered curved arrangement in the solution area to be measured. The two polished surfaces 53, 54 are realized by polishing at the light path exit and entrance surfaces. Firstly, the transmitted light is ensured not to be scattered, so that the test precision is improved; secondly, the surface finish is ensured, so that dirt accumulation on the functional surface is prevented and delayed, scale is formed, and the measurement accuracy is affected. The lower parts of the polishing surfaces 53 and 54 are the rapid-falling curved surfaces 21 tangent to the polishing surfaces 53 and 54, the rapid-falling curved surfaces 21 are designed into a planar structure of 2 sections of cambered surfaces plus one section of middle, and the cambered surfaces have the functions of relieving the curves and enabling impurities or large particles in the liquid to fall along the arc more easily than the non-tangent planes. The realization of the cambered surface is realized through one-step molding of an industrial die as well as the realization of the light path, but the requirements on the size, the shape precision and the surface finish are not high, and the realization is easier. In particular, different metal working techniques may be used for different dimensional requirements and different polishing processes may be used for different finish requirements. In the lower portion of the rapid-decrease curved surface 21, there are a deposition groove 22 and a deposition hole 23. The deposition bath 22 and the deposition hole 23 are formed into a structure with a small bottom and a large top, which is more convenient for drawing in the mold forming. Meanwhile, the requirements for the surface finish of the inner walls of the deposition bath 22 and the deposition holes 23 are contrary to the requirements for the upper polished surfaces 53, 54 thereof, and a dense surface roughening treatment is required, which can still be achieved by a special polishing process.
As shown in fig. 8 and 10, the optical member 20 forms a scale-reducing structure in the solution region to be measured, and particularly forms a deposition hole 23 at the bottom of the deposition bath 22. In this example, the deposition hole 23 may be a square prismatic cuboid structure.
Claims (8)
1. An optical liquid concentration sensor turbulence protection and scale reduction device, which is characterized in that: the device comprises an outer ring column, an inner ring column and a top cover, wherein the top cover is connected with the outer ring column and the inner ring column; the outer ring column is provided with a liquid inlet close to the top cover; the bottom of the outer ring column is provided with an annular platform for installing optical components; the optical component further comprises a first light incidence surface, a first reflecting surface, a first emergent surface, a second incidence surface, a second reflecting surface and a second emergent surface, and a deposition groove and a deposition hole are formed in the lower parts of the first emergent surface and the second incidence surface; a speed-reducing curved surface is connected between the first outgoing surface and the deposition groove and between the first incoming surface and the second incoming surface; the optical component further comprises a limiting platform, and the limiting platform and the bottom of the inner ring column form an entry channel of the solution to be tested.
2. The optical liquid concentration sensor turbulence guard and scale reduction device of claim 1, wherein: the liquid inlet and the outer ring column form an included angle in the axial direction to redirect the liquid, and the liquid is far away from the measured solution section of the optical passage, so that turbulent flow can be isolated to the greatest extent; the axial direction of the column gap forms an angle with the bottom passageway again to redirect the liquid once again.
3. The optical liquid concentration sensor turbulence guard and scale reduction device of claim 1, wherein: and the top cover is provided with small holes, small hole areas and buffer spokes.
4. The optical liquid concentration sensor turbulence guard and scale reduction device of claim 1, wherein: the outer ring column is kept radially sealed with the optical component of the sensor device at the middle position of the column body; the side surface of the optical component is provided with a groove matched with the sealing ring, the optical component is provided with a round waist, and the circular sealing ring is convenient to place.
5. The optical liquid concentration sensor turbulence guard and scale reduction device of claim 1, wherein: the first emergent surface and the second incident surface are high polished surfaces; the deposition groove is connected to the lower part of the rapid-falling curved surface; the deposition holes are connected to the bottom plane of the deposition tank; the rapid-decrease curved surface is a curved surface connected between the high polishing surface and the deposition groove.
6. The optical liquid concentration sensor turbulence guard and scale reduction device of claim 3, wherein: the material thickness of the small hole area at the top cover part is slightly thinner than that of other areas, so that pits are formed, and gas is conveniently accumulated at the pits; the inside of the top cover of the non-small hole area has higher smoothness, so that bubbles can be conveniently and rapidly migrated to the small hole area.
7. The optical liquid concentration sensor turbulence guard and scale reduction device of claim 5, wherein: the rapid-degradation curved surface is a polished surface with general smoothness; the deposition groove is of a basin-shaped structure, and the bottom of the deposition groove is a non-polishing plane; the deposition holes are blind holes.
8. An optical liquid concentration testing device is characterized in that: turbulence protection and scale reduction device comprising an optical liquid concentration sensor according to any one of claims 1 to 7.
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| US4794086A (en) * | 1985-11-25 | 1988-12-27 | Liquid Air Corporation | Method for measurement of impurities in liquids |
| JP2005030945A (en) * | 2003-07-07 | 2005-02-03 | Daihatsu Diesel Mfg Co Ltd | Oil mist concentration detecting apparatus |
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