CN117214388A - High-reliability nitrogen-oxygen sensor - Google Patents
High-reliability nitrogen-oxygen sensor Download PDFInfo
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- CN117214388A CN117214388A CN202311274392.6A CN202311274392A CN117214388A CN 117214388 A CN117214388 A CN 117214388A CN 202311274392 A CN202311274392 A CN 202311274392A CN 117214388 A CN117214388 A CN 117214388A
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- ceramic
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- sleeve
- air inlet
- ceramic chip
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- DOTMOQHOJINYBL-UHFFFAOYSA-N molecular nitrogen;molecular oxygen Chemical compound N#N.O=O DOTMOQHOJINYBL-UHFFFAOYSA-N 0.000 title claims abstract description 27
- 239000000919 ceramic Substances 0.000 claims abstract description 177
- 238000007789 sealing Methods 0.000 claims abstract description 18
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims description 48
- 239000012212 insulator Substances 0.000 claims description 42
- 239000002184 metal Substances 0.000 claims description 41
- 239000000523 sample Substances 0.000 claims description 9
- 230000008054 signal transmission Effects 0.000 claims description 7
- 238000009413 insulation Methods 0.000 claims description 4
- 210000000078 claw Anatomy 0.000 claims description 3
- 238000010030 laminating Methods 0.000 claims 1
- 230000006835 compression Effects 0.000 abstract description 26
- 238000007906 compression Methods 0.000 abstract description 26
- 239000007789 gas Substances 0.000 abstract description 26
- 238000001514 detection method Methods 0.000 abstract description 13
- 239000002245 particle Substances 0.000 abstract description 8
- 239000007787 solid Substances 0.000 abstract description 8
- 230000009286 beneficial effect Effects 0.000 description 22
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 9
- 230000001105 regulatory effect Effects 0.000 description 9
- 238000001125 extrusion Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 229910052623 talc Inorganic materials 0.000 description 4
- 239000000454 talc Substances 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 235000012222 talc Nutrition 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005056 compaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 235000013372 meat Nutrition 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/403—Cells and electrode assemblies
- G01N27/406—Cells and probes with solid electrolytes
- G01N27/407—Cells and probes with solid electrolytes for investigating or analysing gases
- G01N27/409—Oxygen concentration cells
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Molecular Biology (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Measuring Oxygen Concentration In Cells (AREA)
Abstract
The invention provides a high-reliability nitrogen-oxygen sensor. The high-reliability nitrogen-oxygen sensor adopts a labyrinth air inlet path and a two-stage high-performance sealing body, so that solid particles in the tail gas are effectively prevented from entering, the tail gas is ensured not to diffuse into the reference cavity, and the detection accuracy is improved. The electric connection structure comprises a ceramic chip, a first ceramic terminal, a second ceramic terminal, a hoop spring and a sleeve, wherein the first pressure spring and the second pressure spring can provide uniform and stable elastic force, ensure that stable contact force is kept between the first ceramic terminal and the electrode of the second ceramic terminal and the electrode of the ceramic chip for a long time, ensure electric conduction performance, ensure accuracy of detection results of the nitrogen-oxygen sensor and improve reliability of the sensor. The first pressing mechanism and the second pressing mechanism of the assembly jig can stably control the compression amount of the first pressure spring and the second pressure spring, prevent the first pressure spring and the second pressure spring from excessively deforming and deviating, and improve the reliability of the nitrogen-oxygen sensor.
Description
Technical Field
The invention relates to the technical field of nitrogen-oxygen sensors, in particular to a high-reliability nitrogen-oxygen sensor.
Background
In an exhaust system of a vehicle exhaust, a nitrogen-oxygen concentration in exhaust gas is detected by a ceramic chip of a nitrogen-oxygen sensor detection probe. The ceramic chip is the most core part of the whole sensor, the detection current led out by the ceramic chip belongs to micro-current, the nitrogen-oxygen sensor is also subjected to vibration transmission of a vehicle, if the connection between the ceramic chip and a signal transmission line is not reliable enough, a current break can be formed, and a controller cannot output a correct detection result. At present, a direct-insertion structure is adopted between the ceramic chip and the lead connector, the contact pressure between the lead connector and the ceramic chip is smaller, and the reliability of electric connection is low. Meanwhile, for some high-reliability electric connection structures, a reliable assembly auxiliary jig is also required to be configured to prevent unstable hidden trouble caused by poor operation. In addition, the air inlet structure of the existing nitrogen-oxygen sensor is not reasonable enough, and solid particles cannot be effectively prevented from entering a diffusion channel of a ceramic chip; the existing isolation sealing structure is not tight enough, and air leakage phenomenon is easy to occur under thermal shock of thermal expansion and cold contraction, so that the change of the gas content in the air at the side of the reference chamber is caused, and the accuracy of detecting the concentration of the nitrogen oxides in the tail gas is affected.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide an electric connection structure of a ceramic chip, an assembly jig and a high-reliability nitrogen-oxygen sensor.
In order to achieve the above purpose, the technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides an electric connection structure of ceramic chip, includes ceramic chip, first ceramic terminal, second ceramic terminal, hoop spring and sleeve pipe, the positive and negative of ceramic chip all is equipped with the electrode, first ceramic terminal and second ceramic terminal all include the ceramic base and set up side by side many wiring electrodes on the ceramic base, first ceramic terminal and second ceramic terminal press respectively in the positive and negative surface of ceramic chip, every wiring electrode of first ceramic terminal and second ceramic terminal with one electrode of ceramic chip contacts and switches on, hoop spring includes metal ring piece, first pressure spring and second pressure spring, the periphery of first ceramic terminal and second ceramic terminal is located to the metal ring piece package, first pressure spring is fixed on the metal ring piece with the surface that the first ceramic terminal corresponds, the second pressure spring is fixed on the metal ring piece with the surface that the second ceramic terminal corresponds, the sleeve pipe cover is located the periphery of first pressure spring and second pressure spring.
By adopting the technical scheme of the invention, the first pressure spring and the second pressure spring can provide uniform and stable elastic force, so that stable contact force between the first ceramic terminal and the electrode of the ceramic chip and between the second ceramic terminal and the electrode of the ceramic chip can be ensured for a long time, the electric conduction performance can be ensured, the accuracy of the detection result of the nitrogen-oxygen sensor can be ensured, and the reliability of the sensor can be improved.
Further, the front end of ceramic base is equipped with and hangs and hold the portion, the rear portion of ceramic base is equipped with the location card hole that sets up perpendicularly with the surface, wiring electrode include with the hook portion that ceramic base hung and hold the portion to match, with the inconsistent first protruding contact and the second protruding contact of electrode of ceramic chip, with ceramic base's location card hole matched with vertical jack catch and be located the wiring rand of tail end.
By adopting the preferable scheme, the wiring electrode can be stably mounted on the ceramic base.
Further, the curvature of the bending radian of the first protruding contact is smaller than that of the second protruding contact, and the protruding height of the first protruding contact is 0.2-0.5mm smaller than that of the second protruding contact.
By adopting the preferable scheme, the electrode of the ceramic base is mainly pressed and contacted through the second protruding contact, the first protruding contact can form a support after the second protruding contact is pressed and deformed, the second protruding contact is prevented from being excessively deformed, and the structural stability of the wiring electrode is ensured.
Further, the upper portion of location card hole is equipped with the screens step that expands outward to the rear end, the top of the vertical jack catch of wiring electrode is towards the side that screens step is located is buckled.
By adopting the preferable scheme, the assembly convenience is improved, and the wiring electrode is prevented from falling off.
Further, bosses are respectively arranged on two sides of the surface of the wiring electrode of the ceramic base, and the bosses on two sides are arranged in a staggered manner along the length direction of the wiring electrode.
By adopting the preferable scheme, the ceramic base can be used as a shared component of the first ceramic terminal and the second ceramic terminal, and can form clamping fit when the two ceramic bases are oppositely arranged, so that the alignment of the end parts of the first ceramic terminal and the second ceramic terminal is ensured, and dislocation is prevented.
Further, a limit groove matched with the width of the metal ring piece is formed in the ceramic base.
By adopting the preferable scheme, the metal ring sheet is limited to move, so that the position of the hoop spring is ensured to be stable when the sleeve is sleeved and installed.
Further, the length direction of the first pressure spring and the length direction of the second pressure spring are parallel to the length direction of the ceramic chip, the sections of the first pressure spring and the second pressure spring comprise a bottom surface part, bent arm parts and a contact pressing part, the bottom surface part is arc-shaped, two ends of the bottom surface part respectively extend upwards to form one bent arm part, two bent arm parts extend obliquely from the bottom surface part outwards towards the direction close to each other, the end part of the bent arm part is provided with the contact pressing part, and the contact pressing part bends from the tail end of the bent arm part to the side where the bottom surface part is located.
By adopting the preferable scheme, the first pressure spring and the second pressure spring are ensured to have higher elastic strain capacity, and are convenient to be matched with the sleeve, so that uniform and stable pressing force for the first ceramic terminal and the second ceramic terminal is formed.
Further, the two ends of the bottom surface parts of the first pressure spring and the second pressure spring in the length direction are provided with notches, the metal ring sheet is provided with clamping lugs, and the clamping lugs are clamped on the outer surface of the bottom surface part at the notches.
By adopting the preferable scheme, the first pressure spring and the second pressure spring are convenient to assemble and position.
Further, the metal ring sheet is formed by bending a metal sheet, the section of the metal ring sheet grows into a square frame, the head end and the tail end of the metal ring sheet are separately arranged, and a meat reducing through hole is formed in the side surface of the metal ring sheet opposite to the side surface where the head end and the tail end are located.
By adopting the preferable scheme, the positions of the ceramic chip, the first ceramic terminal and the second ceramic terminal are ensured to be stable.
An assembly jig, comprising:
a main support stand;
the fixed limiting seat is used for placing the combination of the ceramic chip, the first ceramic terminal, the second ceramic terminal and the hoop spring and limiting the combination to move along the length direction of the combination;
the sleeve regulation seat is used for regulating the sleeve, a first translation guide rail which is parallel to the axis direction of the sleeve is arranged below the sleeve regulation seat, and the sleeve regulation seat further comprises a first driving mechanism which is used for driving the sleeve regulation seat to move along the first translation guide rail;
the first pressing mechanism is used for pressing the first pressure spring;
and the second pressing mechanism is used for pressing the second pressure spring.
By adopting the technical scheme, the first pressing mechanism and the second pressing mechanism in the assembly jig can compress the first pressure spring and the second pressure spring to the extent that the sleeve is not influenced, then the sleeve is stably sleeved on the peripheries of the first pressure spring and the second pressure spring by moving the sleeve regulation seat, after the sleeve is sleeved for a certain length, the first pressing mechanism and the second pressing mechanism are loosened, and finally the sleeve is assembled.
Further, the first jacking mechanism comprises a first ejector rod, a first guide sleeve and a second driving mechanism, and the second driving mechanism drives the first ejector rod to move along the first guide sleeve; the second jacking mechanism comprises a second ejector rod, a second guide sleeve and a third driving mechanism, and the third driving mechanism drives the second ejector rod to move along the second guide sleeve.
Further, protruding columns are arranged at the top ends of the first ejector rod and the second ejector rod; when the first pressure spring and the second pressure spring are not pressed, the gap between the two pressing parts is larger than the outer diameter of the convex column; when the first pressure spring and the second pressure spring are pressed, the diameter of an outer circle formed by the outermost ends of the first pressure spring and the second pressure spring is slightly smaller than the inner diameter of the sleeve, and the gap between the two pressing parts is equal to the outer diameter of the convex column.
By adopting the preferable scheme, the convex columns can control the uniform deformation of the first pressure spring and the second pressure spring, prevent deviation and ensure uniform pressure to the terminal.
Further, a first inclined guide rail is arranged at the bottom of the first jacking mechanism, and the first jacking mechanism is positioned at an initial jacking position close to one side of the sleeve regulation seat under the action of a first tension spring; the bottom of the second jacking mechanism is provided with a second inclined guide rail, and the second jacking mechanism is positioned at an initial jacking position close to one side of the sleeve regulation seat under the action of a second tension spring; the first oblique guide rail and the second oblique guide rail are obliquely and outwardly extended from one side close to the sleeve regulating seat to one side far from the sleeve regulating seat and the axis of the sleeve; the first jacking mechanism and the second jacking mechanism are in linkage control with the sleeve regulation seat, and the linkage control means that: the sleeve is moved from the sleeve regulation seat to a 1/3 position point interval for driving the sleeve to be sleeved to the first pressure spring and the second pressure spring, and the first jacking mechanism and the second jacking mechanism are kept at initial jacking positions; after the sleeve is sleeved to 1/3 position points of the first pressure spring and the second pressure spring, the sleeve regulating seat is continuously moved, and simultaneously the first jacking mechanism and the second jacking mechanism are respectively driven to move along the first inclined guide rail and the second inclined guide rail.
After the first pressure spring and the second pressure spring are sleeved on the sleeve, the first pressure pushing mechanism and the second pressure pushing mechanism gradually loosen the pressure pushing of the pressure springs, so that the position matching of the sleeve and the first pressure spring and the second pressure spring is stable and reliable, and balanced compression is ensured.
The utility model provides a high reliability nitrogen oxygen sensor, includes test probe, signal transmission line and controller, test probe includes main body, ceramic chip and tail pipe, still includes:
the air inlet structure is arranged at the front ends of the ceramic chip and the main pipe body and comprises a radial air inlet chamber, an axial air inlet chamber and an inner surrounding air chamber, the inner surrounding air chamber surrounds the head of the ceramic chip, the radial air inlet chamber surrounds the radial periphery of the inner surrounding air chamber, a first air vent communicated with the outside is arranged on the outer wall of the radial air inlet chamber, a second air vent communicated with the radial air inlet chamber is arranged on the wall body of the inner surrounding air chamber, and the projections of the first air vent and the second air vent on the axis are distributed in a staggered manner; the axial air inlet chamber surrounds the head end of the inner surrounding air chamber, a third air outlet communicated with the outside is arranged on the outer wall of the axial air inlet chamber, the air inlet direction of the third air outlet is arranged along the radial direction, a fourth air outlet communicated with the axial air inlet chamber is arranged on the end wall of the inner surrounding air chamber, and the air inlet direction of the fourth air outlet is arranged along the axial direction;
the insulation sealing structure is arranged between the main pipe body and the ceramic chip and comprises a first insulator, a first talcum powder combination body, a second insulator, a second talcum powder combination body and a third insulator which are sleeved on the ceramic chip in sequence from the head end to the tail end;
and the electric connection structure is connected between the rear end of the ceramic chip and the signal transmission line.
By adopting the technical scheme, the vehicle tail gas can enter the inner surrounding air chamber through the first air vent and the second air vent, can enter the inner surrounding air chamber through the third air vent and the fourth air vent, and can promote the flow of the tail gas at the head part of the ceramic chip through two different air vent paths, so that the real-time performance of the tail gas detection result is improved; the labyrinth air inlet path can effectively prevent solid particles in the tail gas from entering, prevent the ceramic chip diffusion channel from being blocked, and improve NO X And (5) gas concentration detection accuracy. The first insulator, the second insulator and the third insulator play a role in radial main support and also play a role in surrounding extrusion talcum powder; the first talcum powder combined body and the second talcum powder combined body can be fully combined with the ceramic chip and the main pipe body after being pressed to form a two-stage high-performance sealing body, so that the insulation sealing performance is greatly improved, the tail gas is ensured not to diffuse into the reference cavity, and the accuracy of detecting the concentration of nitrogen oxides in the tail gas is improved. The first pressure spring and the second pressure spring can provide uniform and stable elastic force to ensure long-term protection between the first ceramic terminal and the electrode of the ceramic chip and between the second ceramic terminal and the electrode of the ceramic chipAnd the stable contact force is maintained, the electric conduction performance is ensured, the accuracy of the detection result of the nitrogen-oxygen sensor is ensured, and the reliability of the sensor is improved.
Further, the device further comprises a first sleeve, a second sleeve and a third sleeve, wherein the third sleeve comprises a first outer diameter part and a second outer diameter part, the outer diameter of the first outer diameter part is smaller than that of the second outer diameter part, the first sleeve is installed at the front end of the main pipe body, the second sleeve is sleeved at the front end of the first sleeve, and the third sleeve is installed at the front end of the main pipe body and surrounds the first sleeve and the second sleeve; the inner cavities of the first sleeve and the second sleeve form the inner surrounding air chamber, and the second air vent is formed on the pipe wall of the first sleeve; the first outer diameter part of the third sleeve and the front end of the second sleeve form an axial air inlet chamber, the third air vent is arranged on the pipe wall of the first outer diameter part of the third sleeve, and the fourth air vent is arranged at the head end of the second sleeve; the radial air inlet chamber is formed between the second outer diameter part of the third sleeve and the second sleeve and the first sleeve, and the first air vent is arranged on the pipe wall of the second outer diameter part of the third sleeve.
By adopting the preferable scheme, the manufacturing and forming are convenient, and the production cost is reduced.
Further, the front end of the second sleeve is tapered.
By adopting the preferable scheme, the air inlet blocking surface can be increased, and meanwhile, solid particles can be smoothly separated from and fall down.
Further, the tail end of the second sleeve is provided with a curled portion, and the first air vent and the second air vent are respectively positioned at two sides of the curled portion in the axial direction.
By adopting the preferable scheme, the tail gas can be caused to twist and revolve, and solid particles are prevented from directly entering the internal air chamber.
Further, an oblique air guide blade is arranged on the inner side of the second air vent.
By adopting the preferable scheme, the tail gas entering the inner surrounding air chamber forms a circular flow, and the temperature of the tail gas and the uniformity of the nitrogen-oxygen concentration are improved.
Further, a first spigot and a second spigot are arranged at the front end of the outer periphery of the main pipe body, the outer diameter of the first spigot is smaller than that of the second spigot, the tail end of the first sleeve is sleeved on the first spigot, and the tail end of the third sleeve is sleeved on the second spigot.
Further, a third spigot is arranged at the front end of the periphery of the first sleeve, and the tail end of the second sleeve is sleeved on the third spigot.
Further, a fourth spigot is arranged at the front end of the periphery of the second sleeve, and the inner wall end of the first outer diameter part of the third sleeve is sleeved on the fourth spigot.
By adopting the preferable scheme, the stable installation of the first sleeve and the second sleeve can be completed only by welding the tail end of the third sleeve on the second spigot of the main pipe body, and the installation convenience is improved.
Further, the first talcum powder combination body and the second talcum powder combination body are formed by pressing a plurality of talcum powder rings.
By adopting the preferable scheme, in order to enhance the sealing effect, the thickness of the second talcum powder combination body can be configured to be larger than that of the first talcum powder combination body, only one talcum powder ring with one thickness size can be configured, the first talcum powder combination body is formed by overlapping and combining two talcum powder rings, the second talcum powder combination body is formed by overlapping and combining three talcum powder rings, the single property of the material is improved, and the use and the management are convenient.
Further, the head of the first insulator is hemispherical, and the matching part of the inner cavity of the main pipe body and the first insulator is conical.
By adopting the preferable scheme, the head of the first insulator is in linear contact with the inner end face of the inner cavity of the main pipe body, so that the first insulator and the main pipe body are self-adaptive to higher coaxiality during pressing, the talcum powder is ensured to fully fill the joint surface gap, and the tightness is improved.
Further, the end surface of the first insulator combined with the first talcum powder combination body is provided with a protruding part.
By adopting the preferable scheme, when the assembly and manufacture are carried out, the first insulator, the first talcum powder combined body, the second insulator, the second talcum powder combined body and the third insulator are firstly placed between the main pipe body and the ceramic chip, then inward extrusion force is applied to the third insulator through the press machine for compaction, the protruding part can squeeze the talcum powder ring more easily, extrusion filling of talcum powder to the fit clearance is promoted, and sealing performance is improved.
Further, the main pipe body is made of metal, a thin-wall metal pipe body is welded at the tail end of the main pipe body, and the wall thickness of the thin-wall metal pipe body is smaller than that of the main pipe body.
Further, the wall thickness of the thin-wall metal pipe body is 0.1-1mm.
Further, a compression ring is arranged on the outer end face of the third insulator, and a necking part for fixing the compression ring is arranged on the thin-wall metal pipe body.
By adopting the preferable scheme, the thicker main pipe body ensures the structural strength, the thin-wall metal pipe body can more conveniently shrink after extrusion, and the insulating sealing structure is ensured to keep stable binding force.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of one embodiment of a high reliability nitrogen-oxygen sensor of the present invention;
FIG. 2 is a cross-sectional view of a test probe;
FIG. 3 is a cross-sectional view of one embodiment of an air intake structure;
FIG. 4 is an enlarged view of a portion of FIG. 3 at A;
FIG. 5 is a schematic diagram of the exhaust gas intake flow direction;
FIG. 6 is a schematic diagram of an embodiment of an insulating seal;
fig. 7 is a schematic structural view of the first insulator;
FIG. 8 is a schematic structural view of a talc ring;
FIG. 9 is a schematic view of an embodiment of an electrical connection structure of the present invention;
FIG. 10 is a schematic view of the construction of a hidden sleeve;
FIG. 11 is one of schematic structural views of a first ceramic terminal;
FIG. 12 is a second schematic view of the structure of the first ceramic terminal;
FIG. 13 is a cross-sectional view of a first ceramic terminal;
FIG. 14 is a schematic view of the structure of the hoop spring;
FIG. 15 is an end view of the hoop spring;
FIG. 16 is a schematic diagram of an embodiment of an assembly fixture according to the present invention;
FIG. 17 is a second schematic diagram of an embodiment of an assembly fixture;
FIG. 18 is a schematic diagram of the assembly jig pressing principle;
fig. 19 is a schematic view of another embodiment of an assembly fixture.
Names of the corresponding parts indicated by numerals and letters in the drawings:
10-detecting probes; 101-a main pipe body; 1011—a first spigot; 1012-a second spigot; 102-a ceramic chip; 103-a thin-wall metal pipe body; 1031-a pinch portion; 104-tail pipe; 11-signal transmission lines; 12-a controller; 20-an air intake structure; 201-radial inlet chamber; 202-an axial inlet chamber; 203-an inner circumferential plenum; 204-a first vent; 205-a second vent; 206-a third vent; 207-fourth air vent; 208-a first sleeve; 2081-third spigot; 209-a second sleeve; 2091—a curl; 2092-fourth spigot; 210-a third sleeve; 2101-a first outer diameter; 2102-a second outer diameter portion; 30-insulating sealing structure; 301-a first insulator; 3011-a protrusion; 302-a first talc combination; 3021-talc ring; 303-a second insulator; 304-a second talc combination; 305-a third insulator; 306-a compression ring; 40-electrical connection structure; 41-a first ceramic terminal; 411-ceramic base; 4111-a catch; 4112-locating the card hole; 4113-boss; 4114-limit groove; 412-wiring electrodes; 4121-a hook; 4122-first male contact; 4123-a second male contact; 4124-vertical jaws; 4125-wire tie collar; 42-a second ceramic terminal; 43-hoop spring; 431-metal ring piece; 4311-ear clip; 4312-meat reducing through holes; 432—a first compression spring; 4321-a bottom surface portion; 4322-bent arm sections; 4323—a touch-press section; 433-a second compression spring; 44-sleeve; 51-main support rack; 52-fixing a limit seat; 53-a sleeve regulation seat; 531-a first drive mechanism; 54-a first pressing mechanism; 541-a first ejector pin; 5411-posts; 542-first guide sleeve; 543-a second drive mechanism; 544-a first diagonal rail; 545-a first tension spring; 55-a second pressing mechanism; 551-a second ejector rod; 552-a second guide sleeve; 553 a third drive mechanism; 554-second diagonal rail; 555-a second tension spring; 561-support block; 562-horizontal slots; 563-supporting block lifting driving mechanism.
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.
As shown in fig. 9 to 15, in an embodiment of the present invention, an electrical connection structure of a ceramic chip includes a ceramic chip 102, a first ceramic terminal 41, a second ceramic terminal 42, a ferrule spring 43, and a sleeve 44, electrodes are disposed on both front and rear surfaces of the ceramic chip 102, the first ceramic terminal 41 and the second ceramic terminal 42 each include a ceramic base 211 and a plurality of connection electrodes 412 disposed side by side on the ceramic base, the first ceramic terminal 41 and the second ceramic terminal 42 are respectively pressed against front and rear surfaces of the ceramic chip 102, each connection electrode of the first ceramic terminal 41 and the second ceramic terminal 42 is in contact with one electrode of the ceramic chip 102, the ferrule spring 43 includes a metal ring 431, a first compression spring 432, and a second compression spring 433, the metal ring 431 is wrapped around the outer circumferences of the first ceramic terminal 41 and the second ceramic terminal 42, the first compression spring 432 is fixed on the metal ring 431 on an outer surface corresponding to the first ceramic terminal 41, the second compression spring 433 is fixed on the metal ring 431 on an outer surface corresponding to the second ceramic terminal 42, and the sleeve 44 is wrapped around the outer circumferences of the first compression spring 432 and the second compression spring 433.
The beneficial effects of adopting above-mentioned technical scheme are: the first pressure spring and the second pressure spring can provide uniform and stable elastic force, ensure that stable contact force is kept for a long time between the first ceramic terminal and the electrode of the ceramic chip and between the second ceramic terminal and the electrode of the ceramic chip, ensure electric conduction performance, ensure accuracy of detection results of the nitrogen-oxygen sensor and improve reliability of the sensor.
As shown in fig. 1-15, in one embodiment of the present invention, a high reliability nitrogen-oxygen sensor includes a sensing probe 10, a signal transmission line 11, and a controller 12, the sensing probe 10 including a main pipe body 101, a ceramic chip 102, and a tail pipe 104,
further comprises:
the air inlet structure 20 is arranged at the front ends of the ceramic chip 102 and the main pipe body 101, the air inlet structure 20 comprises a radial air inlet chamber 201, an axial air inlet chamber 202 and an inner surrounding air chamber 203, the inner surrounding air chamber 203 surrounds the head of the ceramic chip 102, the radial air inlet chamber 201 surrounds the radial periphery of the inner surrounding air chamber 203, a first air vent 204 communicated with the outside is arranged on the outer wall of the radial air inlet chamber 201, a second air vent 205 communicated with the radial air inlet chamber 201 is arranged on the wall of the inner surrounding air chamber 203, and the projections of the first air vent 204 and the second air vent 205 on the axis are distributed in a staggered manner; the axial air inlet chamber 202 surrounds the head end of the inner surrounding air chamber 203, a third air outlet 206 communicated with the outside is arranged on the outer wall of the axial air inlet chamber 202, the air inlet direction of the third air outlet 206 is arranged along the radial direction, a fourth air outlet 207 communicated with the axial air inlet chamber 202 is arranged on the end wall of the inner surrounding air chamber 203, and the air inlet direction of the fourth air outlet 207 is arranged along the axial direction;
the insulating sealing structure 30 is arranged between the main pipe body 101 and the ceramic chip 102, and the insulating sealing structure 30 comprises a first insulator 301, a first talcum powder combined body 302, a second insulator 303, a second talcum powder combined body 304 and a third insulator 305 which are sleeved on the ceramic chip 102 in sequence from the head end to the tail end;
and an electrical connection structure 40 connected between the rear end of the ceramic chip 102 and the signal transmission line 11.
The beneficial effects of adopting above-mentioned technical scheme are: the vehicle tail gas can enter the inner surrounding air chamber through the first air vent and the second air vent, and also can enter the inner surrounding air chamber through the third air vent and the fourth air vent, and two different ventilation paths can promote the flow of the tail gas at the head part of the ceramic chip, so that the real-time performance of the tail gas detection result is improved; the labyrinth air inlet path can effectively prevent solid particles in the tail gas from entering, prevent the ceramic chip diffusion channel from being blocked, and improve NO X And (5) gas concentration detection accuracy. The first insulator, the second insulator and the third insulator play a role in radial main support and also play a role in surrounding extrusion talcum powder; the first talcum powder combined body and the second talcum powder combined body can be fully combined with the ceramic chip and the main pipe body after being pressed to form a two-stage high-performance sealing body, so that the insulation sealing performance is greatly improved, the tail gas is ensured not to diffuse into the reference cavity, and the accuracy of detecting the concentration of nitrogen oxides in the tail gas is improved. The first pressure spring and the second pressure spring can provide uniform and stable elastic force, ensure that stable contact force is kept for a long time between the first ceramic terminal and the electrode of the ceramic chip and between the second ceramic terminal and the electrode of the ceramic chip, ensure electric conduction performance, ensure accuracy of detection results of the nitrogen-oxygen sensor and improve reliability of the sensor.
As shown in fig. 4, in other embodiments of the present invention, the present invention further includes a first sleeve 208, a second sleeve 209, and a third sleeve 210, where the third sleeve 210 includes a first outer diameter portion 2101 and a second outer diameter portion 2102, the outer diameter of the first outer diameter portion 2101 is smaller than the outer diameter of the second outer diameter portion 2102, the first sleeve 208 is mounted on the front end of the main pipe body 101, the second sleeve 209 is sleeved on the front end of the first sleeve 208, and the third sleeve 210 is mounted on the front end of the main pipe body 101 and surrounds the first sleeve 208 and the second sleeve 209; the inner cavities of the first sleeve 208 and the second sleeve 209 form an inner surrounding air chamber 203, and the second air vent 205 is arranged on the pipe wall of the first sleeve 208; the first outer diameter portion 2101 of the third sleeve 210 and the front end of the second sleeve 209 form an axial air inlet chamber 202, a third air vent 206 is formed on the pipe wall of the first outer diameter portion 2101 of the third sleeve, and a fourth air vent 207 is formed on the head end of the second sleeve 209; a radial inlet chamber 201 is formed between the second outer diameter portion 2102 of the third sleeve 210 and the second sleeve 209 and the first sleeve 208, and the first air port 204 is opened on the wall of the second outer diameter portion 2102 of the third sleeve. The beneficial effects of adopting above-mentioned technical scheme are: the manufacturing and the forming are convenient, and the production cost is reduced.
In other embodiments of the invention, as shown in fig. 4, the front end of the second sleeve 209 is tapered. The beneficial effects of adopting above-mentioned technical scheme are: the air inlet blocking surface can be increased, and solid particles can be smoothly separated from the falling of the air inlet blocking surface.
In other embodiments of the present invention, as shown in fig. 4, the tail end of the second sleeve 209 is provided with a curled portion 2091, and the first vent 204 and the second vent 205 are located at two sides of the curled portion 2091 in the axial direction. The beneficial effects of adopting above-mentioned technical scheme are: the tail gas can be caused to twist and revolve, and solid particles are prevented from directly entering the internal air chamber.
In other embodiments of the present invention, the inner side of the second air vent 205 is provided with an oblique air guide blade, the second air vent 205 is formed by stamping, and the stamped second air vent material directly forms the oblique air guide blade. The beneficial effects of adopting above-mentioned technical scheme are: the tail gas entering the inner surrounding air chamber forms a circular flow, and the temperature of the tail gas and the uniformity of the nitrogen-oxygen concentration are improved.
As shown in fig. 4, in other embodiments of the present invention, a first spigot 1011 and a second spigot 1012 are provided at the front end of the outer circumference of the main pipe body 101, the outer diameter of the first spigot 1011 is smaller than the outer diameter of the second spigot 1012, the end of the first sleeve 208 is sleeved on the first spigot 1011, and the end of the third sleeve 210 is sleeved on the second spigot 1012. The front end of the outer circumference of the first sleeve 208 is provided with a third spigot 2081, and the tail end of the second sleeve 209 is sleeved on the third spigot 2081. The second sleeve 209 has a fourth spigot 2092 at its outer peripheral front end, and the inner wall end of the first outer diameter portion 2101 of the third sleeve is fitted over the fourth spigot 2092. The beneficial effects of adopting above-mentioned technical scheme are: the end of the third sleeve is welded on the second spigot of the main pipe body, so that the first sleeve and the second sleeve can be stably installed, and the installation convenience is improved.
In other embodiments of the present invention, as shown in fig. 6 and 8, the first talc powder combination 302 and the second talc powder combination 304 are formed by pressing a plurality of talc powder rings 3021. The beneficial effects of adopting above-mentioned technical scheme are: in order to enhance the sealing effect, the thickness of the second talcum powder combination body can be configured to be larger than that of the first talcum powder combination body, so that sealing structures with different thicknesses are formed, the first talcum powder combination body is formed by overlapping and combining two talcum powder rings, the second talcum powder combination body is formed by overlapping and combining three talcum powder rings, only talcum powder rings with one thickness size can be configured, the single property of a material is improved, and the use and the management are convenient.
In other embodiments of the present invention, as shown in fig. 6 and 7, the head of the first insulator 301 is hemispherical, and the inner cavity of the main tube 101 is tapered where it mates with the first insulator 301. The beneficial effects of adopting above-mentioned technical scheme are: the first insulator head forms linear contact with the inner end face of the main pipe body cavity, so that the first insulator and the main pipe body are self-adaptive to higher coaxiality during pressing, talcum powder is ensured to fully fill a joint surface gap, and the tightness is improved.
In other embodiments of the present invention, the end surface of the first insulator 301 combined with the first talc powder combined body 302 has a protruding portion 3011. The beneficial effects of adopting above-mentioned technical scheme are: when the assembly manufacturing, firstly put into main pipe body and ceramic chip with first insulator, first talcum powder combination, second insulator, second talcum powder combination and third insulator between, then apply the compaction of inwards extrusion force to third insulator through the press again, the bulge can squeeze the talcum powder ring more easily, promotes the extrusion filling of talcum powder to mating clearance department, promotes sealing performance.
In other embodiments of the present invention, as shown in fig. 6, the main pipe body 101 is made of metal, the thin-walled metal pipe body 103 is welded to the tail end of the main pipe body 101, and the wall thickness of the thin-walled metal pipe body 103 is smaller than the wall thickness of the main pipe body 101. The wall thickness of the thin-walled metal tube body 103 is 0.1-1mm. A pressing ring 306 is provided on the outer end surface of the third insulator 305, and a reduced-diameter portion 1031 for fixing the pressing ring 306 is provided on the thin-walled metal pipe body 103. The beneficial effects of adopting above-mentioned technical scheme are: the thicker main pipe body ensures the structural strength, the thin-wall metal pipe body can more conveniently shrink after extrusion, and the insulating sealing structure is ensured to keep stable binding force.
As shown in fig. 12 and 13, in other embodiments of the present invention, a hanging portion 4111 is provided at a front end of the ceramic base 411, a positioning hole 4112 vertically provided on a surface is provided at a rear portion of the ceramic base 411, and the wiring electrode 412 includes a hanging portion 4121 matching with the hanging portion of the ceramic base, a first protruding contact 4122 and a second protruding contact 4123 that are in contact with an electrode of the ceramic chip, a vertical claw 4124 matching with the positioning hole of the ceramic base, and a wiring collar 4125 at a rear end. The beneficial effects of adopting above-mentioned technical scheme are: ensuring that the wiring electrode can be stably mounted on the ceramic base.
In other embodiments of the present invention, as shown in fig. 13, the curved curvature of the first protruding contact 4122 is less than the curved curvature of the second protruding contact 4123, and the protruding height of the first protruding contact 4122 is 0.2-0.5mm less than the protruding height of the second protruding contact 4123. The beneficial effects of adopting above-mentioned technical scheme are: the electrode of the ceramic base is mainly pressed and contacted through the second protruding contact, the first protruding contact can form a support after the second protruding contact is pressed and deformed, the second protruding contact is prevented from being excessively deformed, and the structural stability of the wiring electrode is ensured.
As shown in fig. 13, in other embodiments of the present invention, a clamping step that expands outwards towards the rear end is provided at the upper portion of the positioning clamping hole 4112, and the top end of the vertical claw 4124 of the wiring electrode is bent towards the side where the clamping step is located. The beneficial effects of adopting above-mentioned technical scheme are: the convenience of assembly is improved, and the wiring electrode is prevented from falling off.
As shown in fig. 11, in other embodiments of the present invention, two sides of the surface of the ceramic base 411 where the connection electrode is located are respectively provided with a boss 4113, and the two side bosses 4113 are staggered along the length direction of the connection electrode. The beneficial effects of adopting above-mentioned technical scheme are: the ceramic base can be used as a shared component of the first ceramic terminal and the second ceramic terminal, and can form clamping fit when the two ceramic bases are oppositely arranged, so that the alignment of the end parts of the first ceramic terminal and the second ceramic terminal is ensured, and dislocation is prevented.
In other embodiments of the present invention, as shown in fig. 12, a limiting groove 4114 matching the width of the metal ring 431 is provided on the ceramic base 411. The beneficial effects of adopting above-mentioned technical scheme are: and the movement of the metal ring sheet is limited, so that the position of the hoop spring is ensured to be stable when the sleeve is sleeved and installed.
As shown in fig. 14 and 15, in other embodiments of the present invention, the length direction of the first compression spring 432 and the second compression spring 433 are parallel to the length direction of the ceramic chip 102, the cross sections of the first compression spring 432 and the second compression spring 433 each include a bottom surface portion 4321, a bent arm portion 4322 and a contact portion 4323, the bottom surface portion 4321 is arc-shaped, two ends of the bottom surface portion 4321 extend upwards to form one bent arm portion 4322, the two bent arm portions 4322 extend outwards from the bottom surface portion 4321 in directions approaching each other, the contact portion 4323 is provided at an end of the bent arm portion 4322, and the contact portion 4323 is bent from a distal end of the bent arm portion 4322 to a side where the bottom surface portion is located. The beneficial effects of adopting above-mentioned technical scheme are: the first pressure spring and the second pressure spring are guaranteed to have higher elastic strain capacity, are convenient to match with the sleeve, and form uniform and stable pressing force on the first ceramic terminal and the second ceramic terminal.
As shown in fig. 14 and 15, in other embodiments of the present invention, both ends in the longitudinal direction of the bottom surface portions of the first compression spring 432 and the second compression spring 433 are provided with notches, and the metal ring 431 is provided with lugs 4311, and the lugs 4311 are clamped on the outer surface of the bottom surface portion at the notches. The beneficial effects of adopting above-mentioned technical scheme are: the first pressure spring and the second pressure spring are convenient to assemble and position.
As shown in fig. 14 and 15, in other embodiments of the present invention, the metal ring 431 is formed by bending a metal sheet, the cross section of the metal ring 431 is a rectangular frame, the front end and the rear end of the metal ring 431 are separately arranged, and the side surface of the metal ring 431 opposite to the side surface of the front end and the rear end is provided with a meat reducing through hole 4312. The beneficial effects of adopting above-mentioned technical scheme are: ensuring that the ceramic chip, the first ceramic terminal and the second ceramic terminal remain stable in position.
As shown in fig. 16-18, in one embodiment of the present invention, an assembly jig for an electrical connection structure of a ceramic chip includes:
a main support stand 51;
a fixed limit seat 52 for placing the combination of the ceramic chip, the first ceramic terminal, the second ceramic terminal and the clip spring and limiting the movement of the combination in the length direction thereof;
the casing regulation seat 53 is used for regulating the casing 44, a first translation guide rail parallel to the axis direction of the casing is arranged below the casing regulation seat 53, and the casing regulation seat further comprises a first driving mechanism 531 for driving the casing regulation seat 53 to move along the first translation guide rail;
a first pressing mechanism 54 for pressing the first compression spring 432;
and a second pressing mechanism 55 for pressing the second compression spring 433.
The beneficial effects of adopting above-mentioned technical scheme are: the first pressing mechanism and the second pressing mechanism in the assembly jig can compress the first pressure spring and the second pressure spring to the extent that the sleeve is not influenced, then the sleeve is stably sleeved on the peripheries of the first pressure spring and the second pressure spring by moving the sleeve regulation seat, after the sleeve is sleeved for a certain length, the first pressing mechanism and the second pressing mechanism are loosened, and finally the sleeve is assembled.
As shown in fig. 18, in other embodiments of the present invention, the first pushing mechanism 54 includes a first ejector rod 541, a first guide sleeve 542, and a second driving mechanism 543, where the second driving mechanism 543 drives the first ejector rod 541 to move along the first guide sleeve 542; the second pressing mechanism 55 includes a second ejector rod 551, a second guide sleeve 552, and a third driving mechanism 553, where the third driving mechanism 553 drives the second ejector rod 551 to move along the second guide sleeve 552. The top ends of the first ejector rod 541 and the second ejector rod 551 are provided with convex columns 5411; when the first compression spring 432 and the second compression spring 433 are not in a compressed state, the gap between the two contact portions 4323 is larger than the outer diameter of the boss 5411; when the first and second compression springs are compressed, the outer diameters of the outermost ends of the first and second compression springs are slightly smaller than the inner diameter of the sleeve 44, and the gap between the two contact portions 4323 is equal to or slightly larger than the outer diameter of the boss 5411. The beneficial effects of adopting above-mentioned technical scheme are: the convex columns can control the uniform deformation of the first pressure spring and the second pressure spring, prevent deflection and ensure uniform pressure to the terminal.
In other embodiments of the present invention, as shown in fig. 17, a holding mechanism for holding the lower portion of the combination of the ceramic chip, the first ceramic terminal, the second ceramic terminal, and the ferrule spring is further included. The supporting mechanism comprises a supporting block 561 and a supporting block lifting driving mechanism 563. The lower part of the supporting block 561 is provided with a horizontal groove 562, the supporting block lifting driving mechanism 563 comprises a control rod, the control rod penetrates through the table top of the main supporting table frame 51, the lower end of the control rod is rotatably arranged in the horizontal groove 562, and the middle position of the control rod is hinged on the main supporting table frame 51. The beneficial effects of adopting above-mentioned technical scheme are: the initial position of the combination body is convenient to place, and the first jacking mechanism and the second jacking mechanism can be ensured to accurately and stably apply force.
As shown in fig. 19, in other embodiments of the present invention, a first diagonal guide rail 544 is disposed at the bottom of the first pressing mechanism 54, and the first pressing mechanism 54 is under the action of a first tension spring 545 in an initial pressing position near one side of the sleeve regulation seat; a second inclined guide rail 554 is arranged at the bottom of the second jacking mechanism 55, and the second jacking mechanism 55 is positioned at an initial jacking position close to one side of the sleeve regulation seat under the action of a second tension spring 555; the first inclined guide rail 544 and the second inclined guide rail 554 are arranged in an inclined extending manner from one side close to the sleeve regulating seat to one side far from the sleeve regulating seat and the axis of the sleeve; the first pressing mechanism 54 and the second pressing mechanism 55 are controlled in linkage with the sleeve regulating seat 53, and the linkage control means: the sleeve is moved from the sleeve regulation seat to a 1/3 position point interval for driving the sleeve to be sleeved to the first pressure spring and the second pressure spring, and the first jacking mechanism 54 and the second jacking mechanism 55 are kept at initial jacking positions; after the sleeve is sleeved to the 1/3 position points of the first pressure spring and the second pressure spring, the sleeve regulating seat 53 continues to move and simultaneously drives the first pressing mechanism 54 and the second pressing mechanism 55 to move along the first inclined guide rail 544 and the second inclined guide rail 554 respectively. After the first pressure spring and the second pressure spring are sleeved on the sleeve, the first pressure pushing mechanism and the second pressure pushing mechanism gradually loosen the pressure pushing of the pressure springs, so that the position matching of the sleeve and the first pressure spring and the second pressure spring is stable and reliable, and balanced compression is ensured.
The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, but not limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of the present invention.
Claims (5)
1. The utility model provides a high reliability nitrogen oxygen sensor which characterized in that, includes test probe, signal transmission line and controller, test probe includes main body, ceramic chip and tail pipe, still includes:
the air inlet structure is arranged at the front ends of the ceramic chip and the main pipe body and comprises a radial air inlet chamber, an axial air inlet chamber and an inner surrounding air chamber, the inner surrounding air chamber surrounds the head of the ceramic chip, the radial air inlet chamber surrounds the radial periphery of the inner surrounding air chamber, a first air vent communicated with the outside is arranged on the outer wall of the radial air inlet chamber, a second air vent communicated with the radial air inlet chamber is arranged on the wall body of the inner surrounding air chamber, and the projections of the first air vent and the second air vent on the axis are distributed in a staggered manner; the axial air inlet chamber surrounds the head end of the inner surrounding air chamber, a third air outlet communicated with the outside is arranged on the outer wall of the axial air inlet chamber, the air inlet direction of the third air outlet is arranged along the radial direction, a fourth air outlet communicated with the axial air inlet chamber is arranged on the end wall of the inner surrounding air chamber, and the air inlet direction of the fourth air outlet is arranged along the axial direction;
the insulation sealing structure is arranged between the main pipe body and the ceramic chip and comprises a first insulator, a first talcum powder combination body, a second insulator, a second talcum powder combination body and a third insulator which are sleeved on the ceramic chip in sequence from the head end to the tail end;
the electric connection structure of the ceramic chip is connected between the rear end of the ceramic chip and the signal transmission line; the electric connection structure comprises a ceramic chip, a first ceramic terminal, a second ceramic terminal, a hoop spring and a sleeve, electrodes are arranged on the front side and the back side of the ceramic chip, the first ceramic terminal and the second ceramic terminal comprise a ceramic base and a plurality of wiring electrodes arranged on the ceramic base side by side, the first ceramic terminal and the second ceramic terminal are respectively pressed against the front surface and the back surface of the ceramic chip, each wiring electrode of the first ceramic terminal and the second ceramic terminal is in contact with one electrode of the ceramic chip for conduction, the hoop spring comprises a metal ring sheet, a first pressure spring and a second pressure spring, the metal ring sheet is wrapped on the peripheries of the first ceramic terminal and the second ceramic terminal, the first pressure spring is fixed on the metal ring sheet and on the outer surface corresponding to the first ceramic terminal, and the sleeve is sleeved on the peripheries of the first pressure spring and the second pressure spring.
2. The high reliability nitrogen-oxygen sensor of claim 1 wherein the first talc powder combination and the second talc powder combination are each formed by laminating a plurality of talc powder rings; the head of the first insulator is hemispherical, and the matching part of the inner cavity of the main pipe body and the first insulator is conical; the end face of the first insulator combined with the first talcum powder combination body is provided with a protruding part.
3. The high-reliability nitrogen-oxygen sensor according to claim 1, wherein the front end of the ceramic base is provided with a hanging part, the rear part of the ceramic base is provided with a positioning clamping hole which is perpendicular to the surface, and the wiring electrode comprises a hanging part matched with the hanging part of the ceramic base, a first protruding contact and a second protruding contact which are abutted against the electrode of the ceramic chip, a vertical claw matched with the positioning clamping hole of the ceramic base and a wiring clamping ring positioned at the tail end.
4. The high reliability nitrogen-oxygen sensor of claim 3, wherein the first protruding contact has a curvature of curvature less than a curvature of the second protruding contact, and wherein the protruding height of the first protruding contact is 0.2-0.5mm less than the protruding height of the second protruding contact.
5. The high-reliability nitrogen-oxygen sensor according to claim 1, wherein the length direction of the first pressure spring and the length direction of the second pressure spring are parallel to the length direction of the ceramic chip, the cross sections of the first pressure spring and the second pressure spring comprise bottom surface parts, bent arm parts and contact pressing parts, the bottom surface parts are arc-shaped, two ends of the bottom surface parts respectively extend upwards to form one bent arm part, the two bent arm parts extend outwards and obliquely towards the direction close to the bottom surface parts, the contact pressing parts are arranged at the end parts of the bent arm parts, and the contact pressing parts are bent from the tail ends of the bent arm parts to the side where the bottom surface parts are located.
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| CN202311274392.6A CN117214388A (en) | 2021-07-22 | 2021-07-22 | High-reliability nitrogen-oxygen sensor |
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| CN202110828357.9A CN113552187B (en) | 2021-07-22 | 2021-07-22 | Electric connection structure of ceramic chip, assembly jig and high-reliability nitrogen-oxygen sensor |
| CN202311274392.6A CN117214388A (en) | 2021-07-22 | 2021-07-22 | High-reliability nitrogen-oxygen sensor |
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| US3448911A (en) * | 1967-06-15 | 1969-06-10 | Western Electric Co | Compensating base for simultaneously bonding multiple leads |
| JP2009161403A (en) * | 2008-01-09 | 2009-07-23 | Olympus Corp | Molding method of bottomed glass tube and molding apparatus of bottomed glass tube |
| CN102317766B (en) * | 2010-01-19 | 2014-06-18 | 日本碍子株式会社 | Gas sensor and method of manufacturing the same |
| WO2014192945A1 (en) * | 2013-05-31 | 2014-12-04 | 日本碍子株式会社 | Gas sensor |
| CN105372173B (en) * | 2015-12-09 | 2019-01-11 | 苏州研高自动化科技有限公司 | It is a kind of for detecting the device of die casting |
| JP6904881B2 (en) * | 2017-10-27 | 2021-07-21 | 日本特殊陶業株式会社 | Gas sensor |
| JP7288783B2 (en) * | 2019-03-28 | 2023-06-08 | 日本碍子株式会社 | Sensor element and gas sensor |
| CN214844938U (en) * | 2021-07-22 | 2021-11-23 | 高鑫环保科技(苏州)有限公司 | High-reliability nitrogen-oxygen sensor |
| CN214849374U (en) * | 2021-07-22 | 2021-11-23 | 高鑫环保科技(苏州)有限公司 | Electric connection structure of ceramic chip |
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