阅读说明：本技术 一种陶瓷氧传感器的电极连接结构 (Electrode connection structure of ceramic oxygen sensor ) 是由 *** 于 2020-06-05 设计创作，主要内容包括：一种氧传感器的电极连接结构,包括电极连接端子、氧传感器敏感元件,陶瓷保护件、导线、后端壳体及导线接口,所述陶瓷保护件设有安装槽及导线通孔,该安装槽内设有限位座,所述电极连接端子包括线脚端部及接触端部,该线脚端部与导线通孔内的导线连接,所述电极连接端子的接触端部采用弹性铜合金材质,并反曲弯折设置于限位座与氧传感器敏感元件之间,该接触端部朝向限位座的一侧设有第一磁铁块,所述氧传感器上设有外磁铁,该外磁铁与第一磁铁块磁性相斥,驱动接触端部向氧传感器敏感元件移动。在磁力相斥的作用下,可以暂时驱使两者接触,这时检测是否恢复信号,如有,便是接触点断开问题,如无,便是其他故障。(The utility model provides an electrode connection structure of oxygen sensor, includes electrode connection terminal, oxygen sensor sensing element, ceramic protection piece, wire, rear end casing and wire interface, the ceramic protection piece is equipped with mounting groove and wire through-hole, is equipped with spacing seat in this mounting groove, electrode connection terminal includes stitch tip and contact tip, and this stitch tip is connected with the downthehole wire of wire through-hole, electrode connection terminal's contact tip adopts elasticity copper alloy material to anti-bending is buckled and is set up between spacing seat and oxygen sensor sensing element, and this contact tip is equipped with first magnet piece towards one side of spacing seat, be equipped with the external magnet on the oxygen sensor, this external magnet is repelled with first magnet piece magnetism, and drive contact tip removes to oxygen sensor sensing element. Under the action of magnetic force repulsion, the two can be driven to contact temporarily, and whether the signal is recovered or not is detected, if yes, the contact point is disconnected, and if not, other faults are detected.)

1. The utility model provides an electrode connection structure of oxygen sensor, includes electrode connection terminal, oxygen sensor sensing element, ceramic protection piece, wire, rear end casing and wire interface, ceramic protection piece is equipped with mounting groove and wire through-hole, is equipped with spacing seat in this mounting groove, electrode connection terminal includes stitch tip and contact tip, and this stitch tip is connected its characterized in that with the wire in the wire through-hole: the contact end part of the electrode connecting terminal is made of elastic copper alloy materials, is arranged between the limiting seat and the oxygen sensor sensitive element in a reversely bent and bent mode, a first magnet block is arranged on one side, facing the limiting seat, of the contact end part, an outer magnet is arranged on the oxygen sensor, the outer magnet and the first magnet block are magnetically repelled, and the contact end part is driven to move towards the oxygen sensor sensitive element.

2. The electrode connection structure of an oxygen sensor according to claim 1, wherein: the contact end part of the electrode connecting terminal comprises a contact section arc surface and a tail end limiting pin, the first magnet block is arranged on the contact section arc surface, one side of the tail end limiting pin, which faces the limiting seat, is provided with a second magnet block, and the second magnet block is magnetically attracted with the outer magnet; the position department that the locating part corresponds terminal spacing foot is equipped with the recess, and this recess length direction aligns with terminal spacing foot, the notch department that the recess corresponds terminal spacing foot is equipped with spacing bump, the first magnet piece of outer magnet drive is contradicted oxygen sensor sensing element and is fixed, attracts terminal spacing foot to get into the recess, orders about the contact tip and reverses the bent range increase of buckling.

3. The electrode connection structure of an oxygen sensor according to claim 2, wherein: and a chamfer is arranged on the tail end limiting pin.

Technical Field

The invention relates to the field of low-voltage electric appliances, in particular to an electrode connecting structure of a ceramic oxygen sensor.

Background

The core element of the oxygen sensor is a porous ZrO2 ceramic tube, which is a solid electrolyte with porous platinum (Pt) electrodes sintered on both sides. At a certain temperature, because the oxygen concentration on two sides is different, oxygen molecules on the high-concentration side (the inner side 4 of the ceramic tube) are adsorbed on the platinum electrode and combined with electrons (4 e) to form oxygen ions O2-, so that the electrode is positively charged, and O2-ions migrate to the low-oxygen-concentration side (the waste gas side) through oxygen ion vacancies in the electrolyte, so that the electrode is negatively charged, namely, an electric potential difference is generated.

When the oxygen sensor is installed on the exhaust pipe, the oxygen concentration in the exhaust pipe is measured by utilizing the ceramic sensitive element at high temperature, so that the combustion air-fuel ratio of the engine is monitored and controlled, and the exhaust emission is ensured to reach the standard.

At present, the connection mode of the electrode of the oxygen sensor ceramic sensitive element and the electrode connection terminal mainly comprises clamping, welding and the like.

The main purpose is to make the electrode connection terminal contact with the electrode of the oxygen sensor sensitive element and maintain the electrical connection after the electrode connection terminal is assembled on the ceramic protection piece.

It has the following disadvantages: because the oxygen sensor is always in a vibration state in the driving process of the automobile, if the motor connecting terminal and the oxygen sensor sensitive element are in a hard contact state, the oxygen sensor sensitive element is easy to break under the conditions of over-tight assembly and no shockproof buffer protection.

If the two are in a soft connection state, the connection point is easily disconnected due to long-term vibration, and the oxygen sensor fails.

Moreover, the problems are not serious, and the contact between the electrode connecting terminal and the sensitive element of the oxygen sensor can be recovered, but the disassembly and the maintenance are complicated, so that a large amount of oxygen sensors are abandoned.

Disclosure of Invention

In order to solve the technical defects, the invention provides the electrode connecting structure which can quickly detect the disconnection fault of the contact point without disassembling the oxygen sensor and can quickly repair the contact point.

The technical scheme of the invention is as follows: the utility model provides an electrode connection structure of oxygen sensor, includes electrode connection terminal, oxygen sensor sensing element, ceramic protection piece, wire, rear end casing and wire interface, the ceramic protection piece is equipped with mounting groove and wire through-hole, is equipped with spacing seat in this mounting groove, electrode connection terminal includes stitch tip and contact tip, and this stitch tip is connected with the downthehole wire of wire through-hole, electrode connection terminal's contact tip adopts elasticity copper alloy material to anti-bending is buckled and is set up between spacing seat and oxygen sensor sensing element, and this contact tip is equipped with first magnet piece towards one side of spacing seat, be equipped with the external magnet on the oxygen sensor, this external magnet is repelled with first magnet piece magnetism, and drive contact tip removes to oxygen sensor sensing element.

By adopting the technical scheme, the contact end part of the electrode connecting terminal is made of the elastic copper alloy material, is arranged between the limiting seat and the oxygen sensor sensitive element in a reversely bent and bent mode, and is driven to be in a continuously opened state by utilizing the deformation resistance of the elastic copper alloy, and the deformation resistance can drive the contact end part to be always in contact with the oxygen sensor sensitive element.

And the elasticity of the electrode connecting terminal can alleviate the vibration caused by the running of the automobile, and the breakage of the sensitive element of the oxygen sensor caused by hard extrusion is avoided.

When the oxygen sensor fails and whether the problem of disconnection of the contact point is needed to be judged, the relationship that the magnetism of the outer magnet and the magnetism of the first magnet block repel each other is utilized, the oxygen sensor does not need to be disassembled, and the outer magnet only needs to be moved to the position corresponding to the first magnet block. Under the action of magnetic force repulsion, the two can be driven to contact temporarily, and whether the signal is recovered or not is detected, if yes, the contact point is disconnected, and if not, other faults are detected.

Through the structure, the invention not only can adapt to the vibration problem caused by driving, but also can quickly detect whether the oxygen sensor is in contact point disconnection fault.

The invention further comprises the following steps: the contact end part of the electrode connecting terminal comprises a contact section arc surface and a tail end limiting pin, the first magnet block is arranged on the contact section arc surface, one side of the tail end limiting pin, which faces the limiting seat, is provided with a second magnet block, and the second magnet block is magnetically attracted with the outer magnet; the position department that the locating part corresponds terminal spacing foot is equipped with the recess, and this recess length direction aligns with terminal spacing foot, the notch department that the recess corresponds terminal spacing foot is equipped with spacing bump, the first magnet piece of outer magnet drive is contradicted oxygen sensor sensing element and is fixed, attracts terminal spacing foot to get into the recess, orders about the contact tip and reverses the bent range increase of buckling.

By adopting the technical scheme, the second magnet block is arranged on the tail end limiting pin, and the attraction force between the second magnet block and the external magnetism is utilized. The first magnet piece of outer magnet drive is contradicted oxygen sensor sensing element and is fixed, attracts terminal spacing foot and gets into the recess, orders about the contact tip and bends the range increase of buckling.

The reverse bending amplitude is increased, so that the cambered surface of the contact section can be close to the sensitive element of the oxygen sensor. Meanwhile, the groove and the limiting convex point which are arranged on the limiting seat are utilized, after the tail end limiting foot is attracted by magnetic force to enter the groove, the tail end limiting foot is clamped by the limiting convex point, and the limiting convex point can also keep the clamping position of the tail end limiting foot even if the outer magnet is opened, so that the deformation of the cambered surface of the contact section is continuous. Thereby temporarily repairing the failure of the disconnection of the contact point of the oxygen sensor without disassembling the oxygen sensor.

The invention further comprises the following steps: and a chamfer is arranged on the tail end limiting pin.

By adopting the technical scheme, the chamfer angle arranged on the tail end contact pin is convenient for the tail end contact pin to cross the limit salient point.

Drawings

FIG. 1 is a cross-sectional view of an oxygen sensor of the present invention;

FIG. 2 is a structural view of an electrode connection terminal according to an embodiment of the present invention;

fig. 3 is a diagram illustrating a state in which the terminal stopper pin of the electrode connection terminal enters the groove according to the embodiment of the present invention.

Detailed Description

As shown in fig. 1 to 3, an electrode connection structure of an oxygen sensor 9 comprises an electrode connection terminal 1, an oxygen sensor sensing element 2, a ceramic protection member 3, a lead, a rear end housing and a lead interface, wherein the ceramic protection member 3 is provided with a mounting groove 31 and a lead through hole 32, a limiting seat 33 is arranged in the mounting groove 31, the electrode connecting terminal 1 comprises a pin end part 11 and a contact end part 12, the terminal 11 of the terminal pin is connected with the lead in the lead through hole 32, the contact terminal 12 of the electrode connecting terminal 1 is made of elastic copper alloy material and is arranged between the limiting seat 33 and the sensitive element 2 of the oxygen sensor in a reverse bending way, the side of the contact end part 12 facing the limiting seat 33 is provided with a first magnet block 4, the oxygen sensor 9 is provided with an outer magnet 5, the outer magnet 5 magnetically repels the first magnet block 4, and drives the contact end portion 12 to move toward the oxygen sensor sensing element 2.

The contact end part 12 of the electrode connecting terminal 1 is made of elastic copper alloy materials, is reversely bent and arranged between the limiting seat 33 and the oxygen sensor sensitive element 2, and is driven to be in a continuously opened state by utilizing the deformation resistance of the elastic copper alloy, and the deformation resistance can drive the contact end part 12 to be always in contact with the oxygen sensor sensitive element 2.

And the elasticity of the electrode connecting terminal 1 can alleviate the vibration caused by the running of the automobile, and the breakage of the sensitive element 2 of the oxygen sensor caused by hard extrusion is avoided.

When the oxygen sensor 9 fails and whether the contact point is disconnected or not needs to be judged, the relationship of magnetic repulsion between the outer magnet 5 and the first magnet block 4 is utilized, so that the oxygen sensor 9 does not need to be disassembled, and the outer magnet 5 only needs to be moved to the position corresponding to the first magnet block 4. Under the action of magnetic force repulsion, the two can be driven to contact temporarily, and whether the signal is recovered or not is detected, if yes, the contact point is disconnected, and if not, other faults are detected.

Through the structure, the invention not only can adapt to the vibration problem caused by driving, but also can quickly detect whether the oxygen sensor 9 is in contact point disconnection fault.

The contact end part 12 of the electrode connecting terminal 1 comprises a contact section arc surface 121 and a tail end limiting pin 122, the first magnet block 4 is arranged on the contact section arc surface 121, one side of the tail end limiting pin 122 facing the limiting seat 33 is provided with a second magnet block 6, and the second magnet block 6 is magnetically attracted with the outer magnet 5; a groove 331 is formed in the position, corresponding to the tail end limiting pin 122, of the limiting seat 33, the length direction of the groove 331 is aligned with the tail end limiting pin 122, a limiting convex point 332 is formed in the position, corresponding to the notch of the tail end limiting pin 122, of the groove 331, the outer magnet 5 drives the first magnet block 4 to be abutted against the oxygen sensor sensitive element 2 for fixing, the tail end limiting pin 122 is attracted to enter the groove 331, and the contact end portion 12 is driven to be bent reversely and bent to increase.

By providing the second magnet block 6 on the end stopper leg 122, the force of the second magnet block 6 magnetically attracting the outer magnet 5 is utilized. The external magnet 5 drives the first magnet block 4 to abut against the oxygen sensor sensitive element 2 for fixation, and attracts the tail end limiting pin 122 to enter the groove 331, so as to drive the contact end part 12 to increase the reverse bending amplitude.

The reverse bending amplitude is increased, so that the contact section arc surface 121 can be close to the oxygen sensor sensitive element 2. Meanwhile, by using the groove 331 and the limit bump 332 arranged on the limit seat 33, after the tail end limit pin 122 is attracted by magnetic force and enters the groove 331, the tail end limit pin 122 is clamped by using the limit bump 332, and even if the external magnet 5 is opened, the limit bump 332 can also keep the clamping position of the tail end limit pin 122, so that the deformation of the contact section arc surface 121 is continuous. Thereby temporarily repairing the failure of the disconnection of the contact point of the oxygen sensor 9 without disassembling the oxygen sensor 9.

And a chamfer is arranged on the tail end limiting pin 122.

The chamfer provided on the distal contact leg facilitates its passage over the limit bump 332.