CN214844938U - High-reliability nitrogen-oxygen sensor - Google Patents
High-reliability nitrogen-oxygen sensor Download PDFInfo
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- CN214844938U CN214844938U CN202121669445.0U CN202121669445U CN214844938U CN 214844938 U CN214844938 U CN 214844938U CN 202121669445 U CN202121669445 U CN 202121669445U CN 214844938 U CN214844938 U CN 214844938U
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Abstract
The utility model provides a high reliability nitrogen oxygen sensor, including test probe, signal transmission line and controller, test probe is including being responsible for body, ceramic chip and tail pipe, still including establishing ceramic chip and the inlet structure who is responsible for the body front end, locating be responsible for insulating seal structure and connection between body and the ceramic chip electric connection structure between ceramic chip rear end and the signal transmission line. The labyrinth air inlet path can effectively prevent solid particles in tail gas from entering and prevent the diffusion channel of the ceramic chip from being blocked; the two-stage high-performance talcum powder sealing body greatly improves the insulating sealing performance, ensures that tail gas does not diffuse into the reference cavity, and improves the accuracy of detecting the concentration of nitrogen oxides in the tail gas; the double compression springs can provide uniform and stable elastic force, ensure that the first ceramic terminal and the second ceramic terminal keep stable contact force with electrodes of the ceramic chip for a long time, ensure electric conduction performance and improve the reliability of the sensor.
Description
Technical Field
The utility model relates to a nitrogen oxygen sensor technical field specifically is 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 part of the whole sensor, the front end of the ceramic chip is provided with a cavity into which the detected tail gas flows, and the middle and rear ends of the ceramic chip are provided with reference cavities which need to be communicated with the outside atmosphere. Solid particles in tail gas easily cause the blockage of a ceramic chip diffusion channel, and the air inlet structure of the existing nitrogen-oxygen sensor is not reasonable enough, so that the solid particles can not be effectively prevented from entering the 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. In addition, 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, and if the connection between the ceramic chip and the signal transmission line is not reliable enough, a current open circuit is formed, and the controller cannot output a correct detection 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.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model aims to provide a high-reliability nitrogen-oxygen sensor.
In order to achieve the above object, the technical solution of the present invention is: 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 comprises a first ceramic terminal, a second ceramic terminal, a hoop spring and a sleeve, electrodes are arranged on the front and back surfaces 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 and back surfaces 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, and 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.
By adopting the technical scheme of the utility model, the tail gas of the vehicle can enter the inner surrounding air chamber through the first vent hole and the second vent hole and also can 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 tail gas to flow at the head of the ceramic chip, thereby improving the real-time property of the 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 NOXAccuracy of gas concentration detection. 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.
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.
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.
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 these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an embodiment 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;
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.
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-sleeve.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
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, wherein 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;
an electrical connection structure 40 connected between the rear end of the ceramic chip 102 and the signal transmission line 11, the electrical connection structure 40 includes a first ceramic terminal 41, a second ceramic terminal 42, a hoop spring 43 and a sleeve 44, electrodes are disposed on both front and back sides 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 connection electrode 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 the peripheries 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 the outer surface 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: 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. The first pressure spring and the second pressure spring can provide uniform and stable elasticity, and the electricity of the first ceramic terminal, the second ceramic terminal and the ceramic chip is ensuredThe contact force between the electrodes can be kept stable for a long time, 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.
As shown in fig. 4, in other embodiments of the present invention, the present invention further comprises a first sleeve 208, a second sleeve 209 and a third sleeve 210, wherein the third sleeve 210 comprises 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 installed at the front end of the main pipe 101, the second sleeve 209 is installed at the front end of the first sleeve 208, and the third sleeve 210 is installed at the front end of the main pipe 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 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 present invention, as shown in fig. 4, the front 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 present invention, as shown in fig. 4, the end of the second sleeve 209 is provided with a curl 2091, and the first vent 204 and the second vent 205 are located on opposite sides of the curl 2091 in the axial direction. 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 other embodiments of the present invention, the inner side of the second vent 205 is provided with an oblique fan blade, the second vent 205 is formed by stamping, and the second vent material formed by stamping directly forms the oblique fan blade. 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 front end of the outer periphery of the main tube 101 is provided with a first spigot 1011 and a second spigot 1012, 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 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.
As shown in fig. 6 and 7, in other embodiments of the present invention, the head of the first insulator 301 is hemispherical, and the inner cavity of the main pipe 101 is tapered at the matching position 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, the thin-wall metal pipe body 103 is welded to the tail end of the main pipe body 101, and the wall thickness of the thin-wall 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.
As shown in fig. 12 and 13, in other embodiments of the present invention, the front end of the ceramic base 411 is provided with a hanging portion 4111, the rear portion of the ceramic base 411 is provided 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 abutting against the electrode of the ceramic chip, a vertical claw 4124 matching with the positioning hole of the ceramic base, and a terminal collar 4125 at the tail 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 other embodiments of the present invention, the upper portion of the positioning clamp hole 4112 is provided with a clamping step extending toward the rear end, and the top end of the vertical clamping jaw 4124 of the wiring electrode is bent toward the side where the clamping step is located. The beneficial effect of adopting above-mentioned technical scheme is: improve the assembly convenience, prevent that the wiring electrode from droing.
As shown in fig. 11, in other embodiments of the present invention, bosses 4113 are respectively disposed on both sides of the surface of the wiring electrode of the ceramic base 411, and the bosses 4113 on both sides are disposed in a staggered manner along the length direction of the wiring 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.
As shown in fig. 12, in another embodiment of the present invention, 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 other embodiments of the present invention, the length directions of the first pressure spring 432 and the second pressure spring 433 are parallel to the length direction of the ceramic chip 102, the cross sections of the first pressure spring 432 and the second pressure spring 433 include a bottom surface portion 4321, a bent arm portion 4322 and a pressing portion 4323, the bottom surface portion 4321 is arc-shaped, two ends of the bottom surface portion 4321 respectively extend upward to form one bent arm portion 4322, the two bent arm portions 4322 extend obliquely outward from the bottom surface portion 4321 toward the approaching direction, the pressing portion 4323 is disposed at the end of the bent arm portion 4322, and the pressing portion 4323 is bent from the end of the bent arm portion 4322 to the 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, the first pressure spring 432 and the second pressure spring 433 are provided with notches at both ends in the length direction of the bottom surface portion, and the metal ring piece 431 is provided with a clamping lug 4311, and the clamping lug 4311 is clamped on the outer surface of the bottom surface portion at the notch. 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 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 rectangular, the head and the tail of the metal ring 431 are separately arranged, and a meat reducing through hole 4312 is formed on the side of the metal ring 431 opposite to the side where the head and the tail are located. 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.
The above embodiments are only for illustrating the technical conception and the features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and the protection scope of the present invention can not be limited thereby, and all equivalent changes or modifications made according to the spirit of the present invention should be covered in the protection scope of the present invention.
Claims (10)
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 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 comprises a first ceramic terminal, a second ceramic terminal, a hoop spring and a sleeve, electrodes are arranged on the front and back surfaces 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 and back surfaces 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, and 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 high reliability nitrogen oxygen sensor of claim 1, wherein the gas inlet structure further comprises a first sleeve, a second sleeve and a third sleeve, 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 mounted at the front end of the main pipe body, the second sleeve is mounted at the front end of the first sleeve, and the third sleeve is mounted 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.
3. The high reliability nitroxide sensor of claim 2, wherein the front end of the second sleeve is tapered.
4. The high reliability nitroxide sensor of claim 3, wherein the second sleeve has a curled portion at its rear end, and the first and second vent holes are located on both sides of the curled portion in the axial direction.
5. The high-reliability nitrogen-oxygen sensor as claimed in claim 4, wherein the second vent is provided with an inclined guide vane at the inner side.
6. The highly reliable NOx sensor of claim 1 wherein said first talc powder combination and said second talc powder combination are both laminated from multiple talc powder rings.
7. The high reliability nitroxide sensor of claim 6, wherein the head of the first insulator is hemispherical and the main tube cavity is tapered where it mates with the first insulator.
8. The highly reliable nitrogen oxide sensor according to claim 7, wherein an end face of said first insulator bonded to said first talc powder has a projection.
9. The high-reliability nitrogen-oxygen sensor according to claim 1, wherein a hanging part is arranged at the front end of the ceramic base, a positioning clamp hole is arranged at the rear part of the ceramic base and is perpendicular to the surface of the ceramic base, 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 clamping jaw matched with the positioning clamp hole of the ceramic base and a wiring clamping ring positioned at the tail end of the ceramic base; the curvature of the curvature radian of the first protruding contact is smaller than that of the curvature 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.
10. The high-reliability nitrogen-oxygen sensor according to claim 9, wherein the length direction of the first compression spring and the length direction of the second compression spring are both parallel to the length direction of the ceramic chip, the cross section of each of the first compression spring and the second compression spring comprises 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 respectively extend upwards to form one curved arm portion, the two curved arm portions extend obliquely outwards from the bottom surface portion towards the approaching direction, the pressing portion is arranged at the end portion of each curved arm portion, and the pressing portion is bent from the tail end of each curved arm portion to the side of the bottom surface portion.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121669445.0U CN214844938U (en) | 2021-07-22 | 2021-07-22 | High-reliability nitrogen-oxygen sensor |
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| CN202121669445.0U CN214844938U (en) | 2021-07-22 | 2021-07-22 | High-reliability nitrogen-oxygen sensor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113552187A (en) * | 2021-07-22 | 2021-10-26 | 高鑫环保科技(苏州)有限公司 | Electric connection structure of ceramic chip, assembly jig and high-reliability nitrogen-oxygen sensor |
| CN115266856A (en) * | 2022-06-15 | 2022-11-01 | 常州联德电子有限公司 | High-temperature multi-component flue gas sensor and preparation method thereof |
| CN116046872A (en) * | 2022-05-16 | 2023-05-02 | 徐州芯源诚达传感科技有限公司 | High stability nitrogen oxygen sensor |
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2021
- 2021-07-22 CN CN202121669445.0U patent/CN214844938U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113552187A (en) * | 2021-07-22 | 2021-10-26 | 高鑫环保科技(苏州)有限公司 | Electric connection structure of ceramic chip, assembly jig and high-reliability nitrogen-oxygen sensor |
| CN113552187B (en) * | 2021-07-22 | 2023-10-27 | 高鑫环保科技(苏州)有限公司 | Electric connection structure of ceramic chip, assembly jig and high-reliability nitrogen-oxygen sensor |
| CN116046872A (en) * | 2022-05-16 | 2023-05-02 | 徐州芯源诚达传感科技有限公司 | High stability nitrogen oxygen sensor |
| CN115266856A (en) * | 2022-06-15 | 2022-11-01 | 常州联德电子有限公司 | High-temperature multi-component flue gas sensor and preparation method thereof |
| CN115266856B (en) * | 2022-06-15 | 2024-02-27 | 常州联德电子有限公司 | High-temperature multi-component smoke sensor and preparation method thereof |
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