CN113552187A - Electric connection structure of ceramic chip, assembly jig and high-reliability nitrogen-oxygen sensor - Google Patents
Electric connection structure of ceramic chip, assembly jig and high-reliability nitrogen-oxygen sensor Download PDFInfo
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- CN113552187A CN113552187A CN202110828357.9A CN202110828357A CN113552187A CN 113552187 A CN113552187 A CN 113552187A CN 202110828357 A CN202110828357 A CN 202110828357A CN 113552187 A CN113552187 A CN 113552187A
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- 239000000919 ceramic Substances 0.000 title claims abstract description 190
- DOTMOQHOJINYBL-UHFFFAOYSA-N molecular nitrogen;molecular oxygen Chemical compound N#N.O=O DOTMOQHOJINYBL-UHFFFAOYSA-N 0.000 title claims abstract description 24
- 230000007246 mechanism Effects 0.000 claims abstract description 85
- 230000006835 compression Effects 0.000 claims abstract description 27
- 238000007906 compression Methods 0.000 claims abstract description 27
- 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 54
- 238000003825 pressing Methods 0.000 claims description 50
- 239000012212 insulator Substances 0.000 claims description 48
- 239000002184 metal Substances 0.000 claims description 42
- 230000001105 regulatory effect Effects 0.000 claims description 20
- 238000007789 sealing Methods 0.000 claims description 17
- 239000000523 sample Substances 0.000 claims description 9
- 230000008054 signal transmission Effects 0.000 claims description 8
- 238000012360 testing method Methods 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 5
- 210000000078 claw Anatomy 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 2
- 238000010030 laminating Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 abstract description 30
- 238000001514 detection method Methods 0.000 abstract description 13
- 239000007787 solid Substances 0.000 abstract description 8
- 239000002245 particle Substances 0.000 abstract description 7
- 230000009286 beneficial effect Effects 0.000 description 22
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000001125 extrusion Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 235000013372 meat Nutrition 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
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- 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
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- 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
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- 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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- 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)
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- Measuring Oxygen Concentration In Cells (AREA)
Abstract
The invention provides an electric connection structure of a ceramic chip, an assembly jig and a high-reliability nitrogen-oxygen sensor. 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, so that the contact force between the electrodes of the first ceramic terminal and the ceramic chip and the contact force between the electrodes of the second ceramic terminal and the ceramic chip can be kept stable for a long time, the electric conduction performance is ensured, the accuracy of a detection result of the nitrogen-oxygen sensor is ensured, and the reliability of the sensor is improved. The first jacking mechanism and the second jacking mechanism of the assembling 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. High reliability nitrogen oxygen sensor adopts labyrinth route and the high performance seal of two-stage of admitting air, effectively prevents the entering of solid particle thing in the tail gas, ensures that tail gas does not spread in the reference chamber, improves the degree of accuracy that detects.
Description
Technical Field
The invention relates to the technical field of nitrogen-oxygen sensors, in particular to an electric connection structure of a ceramic chip, an assembly jig and a high-reliability nitrogen-oxygen sensor.
Background
In a vehicle exhaust gas exhaust system, the 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 spare part of whole sensor, and the measuring current that the ceramic chip derived all belongs to the microcurrent, and the nitrogen oxygen sensor also receives the vibrations transmission of vehicle moreover, if the connection between ceramic chip and the signal transmission line is reliable enough, then can form the current and open circuit, and the controller can't output correct testing result. At present, a direct insertion type structure is adopted between the ceramic chip and the wire joint, the contact pressure between the wire joint and the ceramic chip is small, and the electric connection reliability is low. Meanwhile, for some high-reliability electric connection structures, a more reliable assembly auxiliary jig needs to be configured to prevent unstable hidden troubles caused by poor operation. In addition, the air inlet structure of the existing nitrogen-oxygen sensor is not reasonable enough, and the solid particles can not be effectively prevented from entering a diffusion channel of the ceramic chip; the existing isolation sealing structure is not compact enough, and the phenomenon of air leakage is easy to occur under thermal shock of expansion with heat and contraction with cold, 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 tail gas nitrogen oxide is influenced.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide an electrical connection structure of a ceramic chip, an assembly jig and a high-reliability nitrogen-oxygen sensor.
In order to achieve the purpose, the technical scheme adopted by the invention for solving the technical problems is as follows: an electric connection structure of a ceramic chip comprises a ceramic chip, a first ceramic terminal, a second ceramic terminal, a hoop spring and a sleeve, wherein electrodes are arranged on the front surface and the back surface 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 conduction with one electrode of the ceramic chip, the hoop spring comprises a metal ring sheet, a first pressure spring and a second pressure spring, the metal ring sheet is arranged on the peripheries of the first ceramic terminal and the second ceramic terminal, the first pressure spring is fixed on the outer surface of the metal ring sheet corresponding to the first ceramic terminal, the second pressure spring is fixed on the outer surface of the metal ring sheet corresponding to the second ceramic terminal, the sleeve is sleeved on the peripheries of the first pressure spring and the 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 elasticity, ensure that the first ceramic terminal and the second ceramic terminal keep stable contact force with the electrodes of the ceramic chip for a long time, ensure the electric conduction performance, ensure the accuracy of the detection result of the nitrogen-oxygen sensor and improve the reliability of the sensor.
Further, ceramic base's front end is equipped with hangs and holds the portion, ceramic base's rear portion is equipped with the locator card hole that sets up with perpendicular to the surface, the wiring electrode include with ceramic base's the hook portion that holds the portion matching, with ceramic chip's electrode inconsistent first salient contact and second salient contact, with ceramic base's locator card hole matched with vertical jack catch and the wiring rand that is located the tail end.
With the preferred scheme, the wiring electrode can be stably installed on the ceramic base.
Further, the curvature of the first protruding contact is smaller than that of the second protruding contact, and the convex height of the first protruding contact is 0.2-0.5mm smaller than that of the second protruding contact.
Adopt above-mentioned preferred scheme, mainly form the pressure through second salient contact to ceramic substrate's electrode and touch and switch on, first salient contact can receive pressure at second salient contact and warp the back formation support, prevents that second salient contact excessively warp, ensures wiring electrode stable in structure.
Furthermore, the upper portion of locator 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 toward screens step place side buckling.
Adopt above-mentioned preferred scheme, improve the equipment convenience, prevent that the wiring electrode from droing.
Furthermore, bosses are respectively arranged on two sides of the surface of the ceramic base where the wiring electrode is located, and the bosses on the two sides are arranged in a staggered mode in the length direction of the wiring electrode.
By adopting the preferable scheme, the ceramic base can be used as a common component of the first ceramic terminal and the second ceramic terminal, and the clamping fit can be formed when the two ceramic bases are oppositely arranged, so that the end parts of the first ceramic terminal and the second ceramic terminal are aligned and the dislocation is prevented.
Furthermore, a limit groove matched with the width of the metal ring sheet is arranged on the ceramic base.
By adopting the preferable scheme, the metal ring sheet is limited to move, and the position of the hoop spring is ensured to be kept stable when the sleeve is sleeved and installed.
Furthermore, the length directions of the first pressure spring and 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 portions, bent arm portions and pressing portions, the bottom surface portions are arc-shaped, two ends of each bottom surface portion extend upwards to form one bent arm portion, the two bent arm portions extend obliquely outwards from the bottom surface portions towards the direction close to each other, the pressing portions are arranged at the end portions of the bent arm portions, and the pressing portions are bent from the tail ends of the bent arm portions to the side where the bottom surface portions are located.
Adopt above-mentioned preferred scheme, ensure that first pressure spring and second pressure spring possess higher elastic strain ability, be convenient for with the sleeve pipe cooperation, form the even stable biasing force to first ceramic terminal and second ceramic terminal.
Furthermore, the gaps are formed in the two ends of the length direction of the bottom surface portions of the first pressure spring and the second pressure spring, clamping lugs are arranged on the metal ring sheets, and the clamping lugs are arranged on the outer surface of the bottom surface portion at the gaps.
By adopting the preferable scheme, the first pressure spring and the second pressure spring can be assembled and positioned conveniently.
Further, the metal ring piece is formed by bending a metal sheet, the section of the metal ring piece is of a rectangular frame shape, the head end and the tail end of the metal ring piece are separately arranged, and a meat reducing through hole is formed in the side face, opposite to the side face where the head end and the tail end are located, of the metal ring piece.
With the preferred scheme, the positions of the ceramic chip, the first ceramic terminal and the second ceramic terminal are kept stable.
An assembly jig comprising:
a main support stand;
the fixed limiting seat is used for placing a combined body of the ceramic chip, the first ceramic terminal, the second ceramic terminal and the hoop spring and limiting the combined body to move along the length direction of the combined body;
the bushing regulating seat is used for regulating the bushing, a first translation guide rail which is arranged in parallel with the axial direction of the bushing is arranged below the bushing regulating seat, and the bushing regulating seat further comprises a first driving mechanism which is used for driving the bushing regulating seat to move along the first translation guide rail;
the first pressing mechanism is used for pressing the first pressure spring;
and the second jacking mechanism is used for jacking the second pressure spring.
By adopting the technical scheme, the first top pressing mechanism and the second top pressing mechanism in the assembling jig can compress the first pressure spring and the second pressure spring to the extent that the sleeve is not influenced in sleeving, then stably sleeve the sleeve to the peripheries of the first pressure spring and the second pressure spring by moving the sleeve regulation seat, after the sleeve is sleeved with a section of length, the first top pressing mechanism and the second top pressing mechanism are loosened, and finally the assembly of the sleeve is completed.
Furthermore, the first jacking mechanism comprises a first jacking rod, a first guide sleeve and a second driving mechanism, and the second driving mechanism drives the first jacking rod to move along the first guide sleeve; the second jacking mechanism comprises a second jacking rod, a second guide sleeve and a third driving mechanism, and the third driving mechanism drives the second jacking rod to move along the second guide sleeve.
Furthermore, convex 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 in an uncompressed state, 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, and the diameter of an excircle 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, a gap between the two pressing portions is equal to the outer diameter of the convex column.
Adopt above-mentioned preferred scheme, can control the even deformation of first pressure spring and second pressure spring through the projection, prevent the off normal, ensure to provide even pressure to the terminal.
Furthermore, 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; a second inclined guide rail is arranged at the bottom of the second jacking mechanism, 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 inclined guide rail and the second inclined guide rail extend outwards from one side close to the casing regulation seat to the side far away from the casing regulation seat in an inclined manner with the axis of the casing; the first jacking mechanism and the second jacking mechanism are in linkage control with the sleeve regulation seat, and the linkage control refers to the following steps: the first jacking mechanism and the second jacking mechanism are kept at initial jacking positions in a range from the beginning of moving the sleeve regulating seat to 1/3 positions which drive the sleeve to be sleeved to the first compression spring and the second compression spring; after the sleeve is sleeved to the 1/3 position point of the first compression spring and the second compression spring, the sleeve regulation seat continues to move, and meanwhile the first pressing mechanism and the second pressing mechanism are also promoted to move along the first inclined guide rail and the second inclined guide rail respectively.
By adopting the preferable scheme, after the first pressure spring and the second pressure spring are sleeved on the sleeve, the first jacking mechanism and the second jacking mechanism gradually loosen jacking pressure on the pressure springs, so that the position matching of the sleeve and the first pressure spring and the second pressure spring is more 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 is including being responsible for the 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 first air vent and the second air vent are in projection staggered distribution on the axis; the axial air inlet chamber surrounds the head end of the inner surrounding air chamber, a third air inlet communicated with the outside is arranged on the outer wall of the axial air inlet chamber, the air inlet direction of the third air inlet is arranged along the radial direction, a fourth air inlet communicated with the axial air inlet chamber is arranged on the wall body of the end part of the inner surrounding air chamber, and the air inlet direction of the fourth air inlet is arranged along the axial direction;
the insulating and 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, wherein the first insulator, the first talcum powder combination body, the second insulator, the second talcum powder combination body and the third insulator are sequentially sleeved on the ceramic chip from the head end to the tail end;
the electric connection structure is connected between the rear end of the ceramic chip and the signal transmission line.
By adopting the technical scheme of the invention, the vehicle tail gas can enter the inner surrounding gas chamber through the first vent hole and the second vent hole and can also enter the inner surrounding gas chamber through the third vent hole and the fourth vent hole, and the two different vent paths can promote the tail gas to flow at the head of the ceramic chip, thereby improving the real-time property of a tail gas detection result; the labyrinth air inlet path can effectively prevent solid particles in tail gas from entering, prevent the diffusion channel of the ceramic chip from being blocked, and improve NOXGas concentration detection accuracy. The first insulator, the second insulator and the third insulator play a role of radial main support and play a role of surrounding and extruding the talcum powder; first talcum powder combination and second talcum powder combination can fully combine with ceramic chip and main pipe body after the pressurized, form two-stage high performance seal, greatly promote insulating sealing performance, ensure that tail gas does not spread in the reference cavity, improve the degree of accuracy to tail gas nitrogen oxide concentration detection. The first pressure spring and the second pressure spring can provide uniform and stable elastic force, so that the first ceramic terminal and the second ceramic terminal are ensured to maintain stable contact force with the electrodes of the ceramic chip for a long time, and the ceramic chip is ensured to be stable in contact forceThe electric conductivity can ensure the accuracy of the detection result of the nitrogen-oxygen sensor and improve the reliability of the sensor.
The main pipe 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 vent is opened 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 opening is formed in the pipe wall of the first outer diameter part of the third sleeve, and the fourth air opening is formed in 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 between the second outer diameter part of the third sleeve and the first sleeve, and the first air vent is formed in 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.
Adopt above-mentioned preferred scheme, can increase and block the face to admitting air, can make solid particulate matter break away from the whereabouts smoothly simultaneously.
Furthermore, the tail end of the second sleeve is provided with a curled portion, and the first vent hole and the second vent hole are respectively located on two sides of the curled portion in the axial direction.
By adopting the preferable scheme, the tail gas can be enabled to be bent and rotated, and solid particles are prevented from directly entering the internal gas chamber.
Furthermore, an inclined air guide blade is arranged on the inner side of the second air vent.
By adopting the preferable scheme, the circulation flow is formed by the tail gas entering the inner surrounding gas chamber, and the temperature of the tail gas and the uniformity of the nitrogen-oxygen concentration are improved.
Furthermore, the front end of the periphery of the main pipe body is provided with a first spigot and a second spigot, 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.
Furthermore, 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.
Furthermore, a fourth spigot is arranged at the front end of the periphery of the second sleeve, and the tail end of the inner wall of the first outer diameter part of the third sleeve is sleeved on the fourth spigot.
Adopt above-mentioned preferred scheme, only need with the terminal welding of third sleeve pipe on the second tang of being responsible for the body, can accomplish the firm installation of first sleeve pipe and second sleeve pipe, improve the installation convenience.
Furthermore, 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 can be configured, the first talcum powder combination body selects two talcum powder rings to be overlapped and combined, the second talcum powder combination body selects three talcum powder rings to be overlapped and combined, the material singleness is improved, and the use and management are convenient.
Furthermore, the head of the first insulator is a hemisphere, and the matching part of the inner cavity of the main pipe and the first insulator is a conical surface.
Adopt above-mentioned preferred scheme, first insulator head and the interior terminal surface of being responsible for the internal chamber of pipe form linear contact, ensure when the pressfitting, first insulator and being responsible for the body self-adaptation to higher axiality, ensure that the talcum powder fully fills faying face clearance, improve the leakproofness.
Further, an end face of the first insulator to which the first talc powder combined body is bonded has a projection.
By adopting the preferable scheme, when the assembly and the manufacture are carried out, the first insulator, the first talcum powder combination body, the second insulator, the second talcum powder combination body and the third insulator are firstly placed between the main pipe body and the ceramic chip, then the third insulator is pressed by applying inward extrusion force through the press machine, the protruding part can more easily crush the talcum powder ring, the extrusion filling of the talcum powder to the matching gap is promoted, and the sealing performance is improved.
Furthermore, 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 0.1-1 mm.
And furthermore, a pressure ring is arranged on the outer end face of the third insulator, and a necking part for fixing the pressure 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 be more conveniently contracted after being extruded, and the stable binding force of the insulating and sealing structure is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of one embodiment of a high reliability NOx sensor of the present invention;
FIG. 2 is a cross-sectional view of a sensing 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 exhaust gas flow direction;
FIG. 6 is a schematic structural view of one embodiment of an insulating and sealing structure;
FIG. 7 is a schematic view of a first insulator;
FIG. 8 is a schematic structural view of a talc powder ring;
FIG. 9 is a schematic structural view of one embodiment of an electrical connection structure of the present invention;
FIG. 10 is a schematic view of a hidden sleeve construction;
FIG. 11 is one of schematic structural views of a first ceramic terminal;
FIG. 12 is a second schematic structural view of the first ceramic terminal;
FIG. 13 is a cross-sectional view of a first ceramic terminal;
FIG. 14 is a schematic structural view of the tension spring;
FIG. 15 is an end view of the tension spring;
FIG. 16 is a schematic structural diagram of an assembly jig according to an embodiment of the present invention;
FIG. 17 is a second schematic structural view of an embodiment of an assembly fixture;
FIG. 18 is a schematic view illustrating the pressing principle of the assembly jig;
fig. 19 is a schematic structural diagram of another embodiment of an assembly jig.
Names of corresponding parts represented by numerals and letters in the drawings:
10-a detection probe; 101-a main tubular body; 1011-first spigot; 1012-second seam allowance; 102-a ceramic chip; 103-thin-walled metal tube body; 1031-a throat; 104-tail tube; 11-a signal transmission line; 12-a controller; 20-an air intake structure; 201-radial inlet chamber; 202-axial inlet chamber; 203-inner surrounding air chamber; 204 — a first vent; 205-a second vent; 206-a third vent; 207-fourth vent; 208-a first sleeve; 2081-third seam allowance; 209-a second sleeve; 2091-crimp; 2092-fourth stop; 210-a third sleeve; 2101-first outer diameter; 2102-a second outer diameter portion; 30-an insulating and sealing structure; 301-a first insulator; 3011-a projection; 302-a first talc powder combination; 3021-Talcum Ring; 303-a second insulator; 304-a second talc powder combination; 305-a third insulator; 306-a pressure ring; 40-an electrical connection structure; 41-a first ceramic terminal; 411-a ceramic base; 4111-a hanging part; 4112-positioning the card hole; 4113-a boss; 4114-a limit groove; 412-a terminal electrode; 4121-a hook portion; 4122-a first protruding contact; 4123-a second protruding contact; 4124-vertical jaws; 4125-wiring collar; 42-a second ceramic terminal; 43-hook spring; 431-metal ring sheet; 4311-clamping ears; 4312-meat reduction through hole; 432-a first compression spring; 4321-bottom surface part; 4322-elbow section; 4323-pressing part; 433-a second pressure spring; 44-a cannula; 51-a main support bench; 52-fixing a limiting seat; 53-cannula gauge stand; 531 — first drive mechanism; 54-a first jacking mechanism; 541-a first top rod; 5411-convex column; 542-a first guide sleeve; 543-a second drive mechanism; 544-a first diagonal rail; 545-a first tension spring; 55-a second jacking mechanism; 551-second top bar; 552-a second guide sleeve; 553 — a third drive mechanism; 554-a second diagonal rail; 555-a second tension spring; 561-a pallet; 562-horizontal tank; 563-carriage lifting drive mechanism.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present 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 hoop spring 43, and a sleeve 44, wherein electrodes are disposed on front and back 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 the front and back surfaces of the ceramic chip 102, each of the connection electrodes of the first ceramic terminal 41 and the second ceramic terminal 42 is in contact conduction with one electrode of the ceramic chip 102, the hoop 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 outer peripheries of the first ceramic terminal 41 and the second ceramic terminal 42, the first compression spring 432 is fixed to an outer surface of the metal ring 431 corresponding to the first ceramic terminal 41, the second compression spring 433 is fixed on the outer surface of the metal ring 431 corresponding to the second ceramic terminal 42, and the sleeve 44 is sleeved on the peripheries of the first compression spring 432 and the second compression spring 433.
The beneficial effect of adopting above-mentioned technical scheme is: first pressure spring and second pressure spring can provide even stable elasticity, ensure to keep stable contact force for a long time between first ceramic terminal and the electrode of second ceramic terminal and ceramic chip, ensure the electric conductivity performance, ensure the accuracy of nitrogen oxygen sensor testing result, improve the sensor reliability.
As shown in fig. 1 to 15, in one embodiment of the present invention, a high reliability nitrogen oxygen sensor comprises a detection probe 10, a signal transmission line 11 and a controller 12, the detection probe 10 comprises a main tube 101, a ceramic chip 102 and a tail tube 104,
further comprising:
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 periphery of 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 body of the inner surrounding air chamber 203, and the projections of the first air vent 204 and the second air vent 205 on the axial line are distributed in a staggered manner; the axial air inlet chamber 202 surrounds the head end of the inner surrounding air chamber 203, the outer wall of the axial air inlet chamber 202 is provided with a third air inlet 206 communicated with the outside, the air inlet direction of the third air inlet 206 is arranged along the radial direction, the end wall body of the inner surrounding air chamber 203 is provided with a fourth air inlet 207 communicated with the axial air inlet chamber 202, and the air inlet direction of the fourth air inlet 207 is arranged along the axial direction;
the insulating and sealing structure 30 is arranged between the main pipe body 101 and the ceramic chip 102, and the insulating and sealing structure 30 comprises a first insulator 301, a first talcum powder combination 302, a second insulator 303, a second talcum powder combination 304 and a third insulator 305 which are sequentially sleeved on the ceramic chip 102 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 effect of adopting above-mentioned technical scheme is: the tail gas of the vehicle can enter the inner surrounding air chamber through the first vent hole and the second vent hole and can also enter the inner surrounding air chamber through the third vent hole and the fourth vent hole, and the two different vent paths can promote the flow of the tail gas at the head part of the ceramic chip and improve the real-time property of a tail gas detection result; the labyrinth air inlet path can effectively prevent solid particles in tail gas from entering, prevent the diffusion channel of the ceramic chip from being blocked, and improve NOXGas concentration detection accuracy. The first insulator, the second insulator and the third insulator play a role of radial main support and play a role of surrounding and extruding the talcum powder; first talcum powder combination and second talcum powder combination can fully combine with ceramic chip and main pipe body after the pressurized, form two-stage high performance seal, greatly promote insulating sealing performance, ensure that tail gas does not spread in the reference cavity, improve the degree of accuracy to tail gas nitrogen oxide concentration detection. First pressure spring and second pressure spring can provide even stable elasticity, ensure to keep stable contact force for a long time between first ceramic terminal and the electrode of second ceramic terminal and ceramic chip, ensure the electric conductivity performance, ensure the accuracy of nitrogen oxygen sensor testing result, improve the sensor reliability.
As shown in fig. 4, in other embodiments of the present invention, the present invention further includes a first casing 208, a second casing 209, and a third casing 210, where the third casing 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 casing 208 is installed at the front end of the main pipe 101, the second casing 209 is installed at the front end of the first casing 208, and the third casing 210 is installed at the front end of the main pipe 101 and surrounds the first casing 208 and the second casing 209; the inner cavities of the first sleeve 208 and the second sleeve 209 form an inner surrounding air chamber 203, and the second vent 205 is arranged on the wall of the first sleeve 208; the first outer diameter part 2101 of the third sleeve 210 and the front end of the second sleeve 209 form an axial air inlet chamber 202, the third air port 206 is opened on the pipe wall of the first outer diameter part 2101 of the third sleeve, and the fourth air port 207 is opened at the head end of the second sleeve 209; the second outer diameter part 2102 of the third sleeve 210, the second sleeve 209 and the first sleeve 208 form a radial air inlet chamber 201, and the first air vent 204 is opened on the pipe wall of the second outer diameter part 2102 of the third sleeve. The beneficial effect of adopting above-mentioned technical scheme is: the manufacturing and forming are convenient, and the production cost is reduced.
In other embodiments of the invention, as shown in FIG. 4, the forward end of the second sleeve 209 is tapered. The beneficial effect of adopting above-mentioned technical scheme is: can increase and block the face to admitting air, can make solid particle break away from the whereabouts smoothly simultaneously.
In other embodiments of the invention, as shown in fig. 4, the second sleeve 209 is provided with a curl 2091 at the end thereof, and the first vent 204 and the second vent 205 are axially located on opposite sides of the curl 2091. The beneficial effect of adopting above-mentioned technical scheme is: can promote the tail gas to twist and turn, prevent that solid particle from directly entering into inside air chamber.
In another embodiment of the present invention, the second vent 205 is provided with an inclined guide vane inside, the second vent 205 is formed by stamping, and the second vent material is directly formed into the inclined guide vane. The beneficial effect of adopting above-mentioned technical scheme is: the tail gas entering the inner surrounding gas 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, the main tube 101 is provided with a first stop 1011 and a second stop 1012 at the front end of the outer circumference thereof, the outer diameter of the first stop 1011 is smaller than that of the second stop 1012, the end of the first sleeve 208 is sleeved on the first stop 1011, and the end of the third sleeve 210 is sleeved on the second stop 1012. The front end of the outer periphery of the first sleeve 208 is provided with a third seam allowance 2081, and the end of the second sleeve 209 is sleeved on the third seam allowance 2081. The front end of the outer circumference of the second sleeve 209 is provided with a fourth stop 2092, and the end of the inner wall of the first outer diameter portion 2101 of the third sleeve is sleeved on the fourth stop 2092. The beneficial effect of adopting above-mentioned technical scheme is: 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.
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 laminating a plurality of talc powder rings 3021. The beneficial effect of adopting above-mentioned technical scheme is: 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, sealing structures with different thicknesses are formed, two talcum powder rings are selected for the first talcum powder combination body to be overlapped and combined, three talcum powder rings are selected for the second talcum powder combination body to be overlapped and combined, only one talcum powder ring with one thickness can be configured, the material singleness is improved, and the use and 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 at the position where it matches with the first insulator 301. The beneficial effect of adopting above-mentioned technical scheme is: the head of the first insulator is in linear contact with the inner end face of the inner cavity of the main pipe, so that the first insulator and the main pipe are adaptive to higher coaxiality when in press fit, the joint surface gap is fully filled with the talcum powder, and the sealing performance is improved.
In other embodiments of the present invention, the end surface of the first insulator 301 bonded to the first talc powder combined body 302 has a protrusion 3011. The beneficial effect of adopting above-mentioned technical scheme is: during assembly and manufacturing, the first insulator, the first talcum powder combination body, the second insulator, the second talcum powder combination body and the third insulator are placed between the main pipe body and the ceramic chip, inward extrusion force is applied to the third insulator through the press machine for compaction, the talcum powder ring can be easily crushed by the protruding portion, extrusion filling of talcum powder to a fit gap is promoted, and sealing performance is improved.
As shown in fig. 6, in other embodiments of the present invention, the main pipe body 101 is made of metal, a thin-walled metal pipe body 103 is welded to the tail end of the main pipe body 101, and the thickness of the thin-walled metal pipe body 103 is smaller than that of the main pipe body 101. The wall thickness of the thin-walled metal tube 103 is 0.1-1 mm. A press ring 306 is provided on the outer end surface of the third insulator 305, and a throat 1031 for fixing the press ring 306 is provided on the thin-walled metal pipe body 103. The beneficial effect of adopting above-mentioned technical scheme is: the thicker main pipe body ensures the structural strength, the thin-wall metal pipe body can be more convenient to shrink after extrusion, and the stable binding force of the insulating and sealing structure is ensured.
In other embodiments of the present invention, as shown in fig. 12 and 13, the ceramic base 411 has a front end with a hanging portion 4111, a rear end with a positioning hole 4112 perpendicular to the surface, and the terminal electrode 412 includes a hook portion 4121 matching with the hanging portion of the ceramic base, a first protruding contact 4122 and a second protruding contact 4123 against the electrodes of the ceramic chip, a vertical claw 4124 matching with the positioning hole of the ceramic base, and a terminal collar 4125 at the rear end. The beneficial effect of adopting above-mentioned technical scheme is: the stable mounting of the terminal electrode on the ceramic base is ensured.
In other embodiments of the present invention, as shown in fig. 13, the curvature of the first protruding contact 4122 is less than the curvature of the second protruding contact 4123, and the convex height of the first protruding contact 4122 is 0.2-0.5mm less than the convex height of the second protruding contact 4123. The beneficial effect of adopting above-mentioned technical scheme is: mainly form the pressure through second salient contact to ceramic substrate's electrode and touch and switch on, first salient contact can receive pressure at second salient contact and warp the back formation support, prevents that second salient contact excessively warp, ensures wiring electrode stable in structure.
As shown in fig. 13, in another embodiment of the present invention, the upper portion of the positioning pin hole 4112 is provided with a locking step expanding outward toward the rear end, and the top end of the vertical claw 4124 of the terminal electrode is bent toward the side of the locking step. The beneficial effect of adopting above-mentioned technical scheme is: improve the assembly convenience, prevent that the wiring electrode from droing.
In another embodiment of the present invention, as shown in fig. 11, bosses 4113 are respectively formed on both sides of the surface of the ceramic base 411 where the terminal electrode is located, and the bosses 4113 on both sides are offset in the length direction of the terminal electrode. The beneficial effect of adopting above-mentioned technical scheme is: 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 end parts of the first ceramic terminal and the second ceramic terminal are ensured to be aligned and prevented from being dislocated.
In another embodiment of the present invention, as shown in fig. 12, a limiting groove 4114 is formed on the ceramic base 411 to match the width of the metal ring 431. The beneficial effect of adopting above-mentioned technical scheme is: the metal ring sheet is limited to move, and the position of the hoop spring is ensured to be kept stable when the sleeve is sleeved and installed.
As shown in fig. 14 and 15, in another embodiment of the present invention, the length directions of the first compression spring 432 and the second compression spring 433 are both 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 pressing portion 4323, the bottom surface portion 4321 is arc-shaped, both ends of the bottom surface portion 4321 extend upward to form one bent arm portion 4322, the two bent arm portions 4322 extend obliquely outward from the bottom surface portion 4321 in a direction approaching each other, the pressing portion 4323 is provided at an end of the bent arm portion 4322, and the pressing portion 4323 is bent from a tip of the bent arm portion 4322 to a side of the bottom surface portion. The beneficial effect of adopting above-mentioned technical scheme is: ensure that first pressure spring and second pressure spring possess higher elastic strain ability, be convenient for with the sleeve pipe cooperation, form the even stable biasing force to first ceramic terminal and second ceramic terminal.
As shown in fig. 14 and 15, in another embodiment of the present invention, both ends in the longitudinal direction of the bottom surface portion of the first pressure spring 432 and the second pressure spring 433 are provided with notches, the metal ring piece 431 is provided with clamping lugs 4311, and the clamping lugs 4311 are clamped on the outer surface of the bottom surface portion at the notches. The beneficial effect of adopting above-mentioned technical scheme is: the first pressure spring and the second pressure spring are convenient to assemble and position.
As shown in fig. 14 and 15, in another embodiment of the present invention, the metal ring 431 is formed by bending a metal sheet, the cross section of the metal ring 431 is rectangular, the head and the tail of the metal ring 431 are separately disposed, and a side surface of the metal ring 431 opposite to the side surface where the head and the tail are located is provided with a meat reducing through hole 4312. The beneficial effect of adopting above-mentioned technical scheme is: the positions of the ceramic chip, the first ceramic terminal and the second ceramic terminal are ensured to be stable.
As shown in fig. 16 to 18, in an embodiment of the present invention, an assembly jig for a ceramic chip electrical connection structure includes:
a main support stand 51;
a fixed stopper 52 for placing a combination of the ceramic chip, the first ceramic terminal, the second ceramic terminal, and the tension spring and restricting the combination from moving in a length direction thereof;
a ferrule regulating seat 53 for regulating the ferrule 44, a first translation guide rail provided in parallel to the axial direction of the ferrule being provided below the ferrule regulating seat 53, and a first drive mechanism 531 for driving the ferrule regulating seat 53 to move along the first translation guide rail;
a first pressing mechanism 54 for pressing the first compression spring 432;
and the second pressing mechanism 55 is used for pressing the second pressing spring 433.
The beneficial effect of adopting above-mentioned technical scheme is: first roof pressure mechanism and second roof pressure mechanism can compress first pressure spring and second pressure spring earlier in the equipment tool to the degree that does not influence the sleeve pipe and embolia, then through removing sleeve pipe regulation seat with the stable cover of sleeve pipe to first pressure spring and second pressure spring periphery, treat that the sleeve pipe embolias after a section length, loosen first roof pressure mechanism and second roof pressure mechanism again, accomplish the equipment of sheathed tube at last, because the first roof pressure mechanism and the second roof pressure mechanism can the compression capacity of stable control first pressure spring and second pressure spring, prevent that first pressure spring and second pressure spring from taking place excessive deformation and off normal, improve the reliability of nitrogen oxygen sensor.
As shown in fig. 18, in another embodiment of the present invention, the first pressing mechanism 54 includes a first top bar 541, a first guide sleeve 542, and a second driving mechanism 543, wherein the second driving mechanism 543 drives the first top bar 541 to move along the first guide sleeve 542; the second pressing mechanism 55 includes a second top rod 551, a second guide 552, and a third driving mechanism 553, and the third driving mechanism 553 drives the second top rod 551 to move along the second guide 552. The top ends of the first mandril 541 and the second mandril 551 are provided with convex columns 5411; when the first pressure spring 432 and the second pressure spring 433 are not pressed, the gap between the two pressing portions 4323 is larger than the outer diameter of the convex column 5411; when the first pressure spring and the second pressure spring are pressed, and the diameter of the excircle 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 44, the gap between the two pressing portions 4323 is equal to or slightly larger than the outer diameter of the convex column 5411. The beneficial effect of adopting above-mentioned technical scheme is: the convex columns can control the uniform deformation of the first pressure spring and the second pressure spring, so that deviation is prevented, and uniform pressure is provided for the terminals.
In other embodiments of the present invention, as shown in fig. 17, a holding mechanism is further included for holding a lower portion of a combination of the ceramic chip, the first ceramic terminal, the second ceramic terminal, and the tension spring. 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 lever, the control lever is arranged on the table top of the main supporting rack 51 in a penetrating way, the lower end of the control lever is rotatably arranged in the horizontal groove 562, and the middle position of the control lever is hinged on the main supporting rack 51. The beneficial effect of adopting above-mentioned technical scheme is: the initial position of the combination body is convenient to place, and the first jacking mechanism and the second jacking mechanism can accurately and stably apply force.
In other embodiments of the present invention, as shown in fig. 19, a first bias guide 544 is provided at the bottom of the first biasing mechanism 54, and the first biasing mechanism 54 is biased by a first tension spring 545 to an initial biasing position adjacent to one side of the cannula gauge; a second oblique 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 regulating seat under the action of a second tension spring 555; the first angled guide rail 544 and the second angled guide rail 554 are both disposed to extend obliquely outward from the side near the ferrule holder to the side away from the ferrule holder with respect to the axis of the ferrule; the first pressing mechanism 54 and the second pressing mechanism 55 are controlled in a linkage manner with the casing regulating seat 53, and the linkage control means: the first pressing mechanism 54 and the second pressing mechanism 55 are kept at the initial pressing position in the interval from the beginning of moving the sleeve regulating seat to the 1/3 position point which drives the sleeve to be sleeved to the first pressing spring and the second pressing spring; after the sleeve is sleeved to the 1/3 point of the first and second compression springs, the sleeve gauge seat 53 continues to move while the first pressing mechanism 54 and the second pressing mechanism 55 are also urged to move along the first inclined guide rail 544 and the second inclined guide rail 554, respectively. By adopting the preferable scheme, after the first pressure spring and the second pressure spring are sleeved on the sleeve, the first jacking mechanism and the second jacking mechanism gradually loosen jacking pressure on the pressure springs, so that the position matching of the sleeve and the first pressure spring and the second pressure spring is more stable and reliable, and balanced compression is ensured.
The above embodiments are merely illustrative of the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the content of the present invention and implement the present invention, and not to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered in the scope of the present invention.
Claims (10)
1. The electric connection structure of the ceramic chip is characterized by comprising a ceramic chip, a first ceramic terminal, a second ceramic terminal, a hoop spring and a sleeve, wherein electrodes are arranged on the front surface and the back surface 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 conduction with one electrode of the ceramic chip, the hoop spring comprises a metal ring piece, a first pressure spring and a second pressure spring, the metal ring piece is arranged on the peripheries of the first ceramic terminal and the second ceramic terminal, the first pressure spring is fixed on the outer surface of the metal ring piece corresponding to the first ceramic terminal, the second pressure spring is fixed on the outer surface of the metal ring piece corresponding to the second ceramic terminal, and the sleeve is sleeved on the peripheries of the first pressure spring and the second pressure spring.
2. The electrical connection structure of a ceramic chip according to claim 1, wherein the front end of the ceramic base is provided with a hanging portion, the rear portion of the ceramic base is provided with a positioning clip hole perpendicular to the surface, and the connection electrode comprises a hook portion matching with the hanging portion of the ceramic base, a first protruding contact and a second protruding contact abutting against the electrode of the ceramic chip, a vertical claw matching with the positioning clip hole of the ceramic base, and a connection clip ring at the tail end.
3. The electrical connection structure of a ceramic chip according to claim 2, wherein the curvature of the first protruding contact is smaller than the curvature of the second protruding contact, and the convex height of the first protruding contact is smaller than the convex height of the second protruding contact by 0.2-0.5 mm.
4. The electrical connection structure of a ceramic chip according to claim 1, wherein the length direction of each of the first and second compression springs is parallel to the length direction of the ceramic chip, the cross section of each of the first and second compression springs includes a bottom surface portion, a curved arm portion and a pressing portion, the bottom surface portion is arc-shaped, two ends of the bottom surface portion extend upward to form one curved arm portion, the two curved arm portions extend obliquely outward from the bottom surface portion toward the adjacent direction, the pressing portion is provided at an end of each curved arm portion, and the pressing portion is bent from a distal end of the curved arm portion to a side of the bottom surface portion.
5. An assembly jig for assembling the electrical connection structure of the ceramic chip according to any one of claims 1 to 4, wherein the assembly jig is used for sleeving a sleeve of the electrical connection structure to the outer periphery of a combination of the ceramic chip, the first ceramic terminal, the second ceramic terminal and the tension spring, and comprises:
a main support stand;
the fixed limiting seat is used for placing a combined body of the ceramic chip, the first ceramic terminal, the second ceramic terminal and the hoop spring and limiting the combined body to move along the length direction of the combined body;
the bushing regulating seat is used for regulating the bushing, a first translation guide rail which is arranged in parallel with the axial direction of the bushing is arranged below the bushing regulating seat, and the bushing regulating seat further comprises a first driving mechanism which is used for driving the bushing regulating seat to move along the first translation guide rail;
the first pressing mechanism is used for pressing the first pressure spring;
and the second jacking mechanism is used for jacking the second pressure spring.
6. The assembly jig of claim 5, wherein the first pressing 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 jacking rod, a second guide sleeve and a third driving mechanism, and the third driving mechanism drives the second jacking rod to move along the second guide sleeve.
7. The assembly jig of claim 6, wherein the top ends of the first and second ejector rods are provided with protruding columns; when the first pressure spring and the second pressure spring are in an uncompressed state, 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, and the diameter of an excircle 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, a gap between the two pressing portions is equal to the outer diameter of the convex column.
8. The assembly jig of claim 7, wherein a first inclined guide rail is provided at a bottom of the first pressing mechanism, and the first pressing mechanism is positioned at an initial pressing position close to one side of the bushing regulating seat under the action of a first tension spring; a second inclined guide rail is arranged at the bottom of the second jacking mechanism, 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 inclined guide rail and the second inclined guide rail extend outwards from one side close to the casing regulation seat to the side far away from the casing regulation seat in an inclined manner with the axis of the casing; the first jacking mechanism and the second jacking mechanism are in linkage control with the sleeve regulation seat, and the linkage control refers to the following steps: the first jacking mechanism and the second jacking mechanism are kept at initial jacking positions in a range from the beginning of moving the sleeve regulating seat to 1/3 positions which drive the sleeve to be sleeved to the first compression spring and the second compression spring; after the sleeve is sleeved to the 1/3 position point of the first compression spring and the second compression spring, the sleeve regulation seat continues to move, and meanwhile the first pressing mechanism and the second pressing mechanism are also promoted to move along the first inclined guide rail and the second inclined guide rail respectively.
9. High reliability nitrogen oxygen sensor, its characterized in that, including test probe, signal transmission line and controller, test probe still includes including being responsible for the body, ceramic chip and tail pipe:
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 first air vent and the second air vent are in projection staggered distribution on the axis; the axial air inlet chamber surrounds the head end of the inner surrounding air chamber, a third air inlet communicated with the outside is arranged on the outer wall of the axial air inlet chamber, the air inlet direction of the third air inlet is arranged along the radial direction, a fourth air inlet communicated with the axial air inlet chamber is arranged on the wall body of the end part of the inner surrounding air chamber, and the air inlet direction of the fourth air inlet is arranged along the axial direction;
the insulating and 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, wherein the first insulator, the first talcum powder combination body, the second insulator, the second talcum powder combination body and the third insulator are sequentially sleeved on the ceramic chip from the head end to the tail end;
and the electrical connection structure of the ceramic chip as claimed in any one of claims 1 to 4, which is connected between the rear end of the ceramic chip and a signal transmission line.
10. The highly reliable nitrogen oxygen sensor of claim 9, wherein the first and second talc powder combinations are each formed by ring-laminating a plurality of pieces of talc powder; 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 is provided with a convex part.
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| Application Number | Priority Date | Filing Date | Title |
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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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| CN113552187B (en) | 2023-10-27 |
| CN117214388A (en) | 2023-12-12 |
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