CN210294208U

CN210294208U - Wide-area type tail gas sensor with double gas cavity chips

Info

Publication number: CN210294208U
Application number: CN201920791246.3U
Authority: CN
Inventors: 陈磊; 许春君; 宋强; 徐建涛
Original assignee: Zhejiang Rockerstone Electronics Co ltd
Current assignee: Zhejiang Rockerstone Electronics Co ltd
Priority date: 2019-05-29
Filing date: 2019-05-29
Publication date: 2020-04-10
Anticipated expiration: 2029-05-29

Abstract

A wide-area tail gas sensor with a double-gas cavity chip comprises a short sensor and a wire harness, the short sensor comprises a hexagonal base, a chip is arranged in the hexagonal base, an electrode contact is arranged at the upper end of the chip, the lower end of the chip is provided with an outer electrode, the electrode contact is connected with the outer electrode through a conductive coating, the middle part of the outer electrode is provided with an air inlet which is connected with a diffusion barrier channel, barrier ceramics are arranged inside the diffusion barrier channel, the diffusion barrier channel is connected with a first gas cavity, a second gas cavity is arranged behind the first gas cavity, the chip is sequentially sleeved with a ceramic A, a powder ring I, a powder ring II and a ceramic B from bottom to top, the upper end of the chip is an electrode end, and the ceramic A, the powder ring I, the powder ring II and the ceramic B are pressed into the hexagonal base through a pressing device.

Description

Wide-area type tail gas sensor with double gas cavity chips

Technical Field

The utility model relates to an energy saving and emission reduction environmental protection technical field, in particular to wide region type tail gas sensor with two gas cavity chips.

Background

The automobile exhaust sensor is a key feedback sensor in an electronic fuel injection engine control system, is a key part for controlling automobile exhaust emission, reducing environmental pollution of an automobile and improving fuel combustion quality of an automobile engine, and comprises zirconium dioxide and titanium dioxide. The tail gas sensor is a measuring element which utilizes a ceramic sensitive element to measure the oxygen potential in various heating furnaces or exhaust pipelines, calculates the corresponding oxygen concentration by a chemical equilibrium principle, achieves the purposes of monitoring and controlling the combustion air-fuel ratio in the furnace and ensuring the product quality and the tail gas emission to reach the standard, and is widely applied to the atmosphere control of furnace bodies of various coal combustion, oil combustion, gas combustion and the like. The tail gas sensor is used for a feedback control system of an electronic control fuel injection device, is used for detecting the oxygen concentration in exhaust gas and the rich and lean of an air-fuel ratio, monitors the combustion of a theoretical air-fuel ratio (14.7: 1) in an engine, and transmits a feedback signal to a computer. The commonly used tail gas sensor can cause the product to lose efficacy and be easy to loosen under the high-temperature environment because of the use of the metal locking key in the use process.

Meanwhile, with the comprehensive implementation of the national six-emission regulations, the qualitative to quantitative improvement of the exhaust gas air-fuel ratio detection after the combustion of the engine is faced, and the detection effect of the exhaust gas sensor detection chip with higher precision and wider range needs to be realized.

Therefore, a new exhaust gas sensor and a new exhaust gas chip are needed to solve the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a wide region type tail gas sensor with two gas cavity chips for the product can satisfy six emission regulations in state, and has high temperature resistance advantage.

The technical scheme adopted by the utility model for solving the technical problem is that the wide-area tail gas sensor with the double-gas cavity chip comprises a short sensor and a wire harness, wherein the short sensor comprises a hexagonal base, the chip is arranged in the hexagonal base, an inner electrode and a heating circuit are arranged in the chip, an electrode contact is arranged at the upper end of the chip, an outer electrode is arranged at the lower end of the chip, the electrode contact is connected with the outer electrode through a conductive coating, an air inlet hole is arranged at the middle part of the outer electrode, the air inlet hole is connected with a diffusion barrier channel, barrier ceramics are arranged in the diffusion barrier channel, the diffusion barrier channel is connected with a first gas cavity, a second gas cavity is also arranged behind the first gas cavity, the chip is sequentially sleeved with a ceramic A, a powder ring I, a powder ring II and a ceramic B from bottom to top, the upper end of the chip is an electrode end, the ceramic A, the powder ring I, the powder ring II and the ceramic B are pressed into the hexagonal base through a pressing device, and the chip structure is used for quantitatively detecting the air-fuel ratio of the tail gas.

Further, the end cover is equipped with seal ring under the hexagonal base, waste gas hood in the hexagonal base below connection, interior waste gas hood is uncovered cylinder structure, be equipped with a plurality of bleeder vent on the interior waste gas hood lateral wall, the outside cover of interior waste gas hood is equipped with outer waste gas hood, outer waste gas hood bottom is equipped with a plurality of bleeder vent.

Further, the pencil is located section sensor top, the pencil includes the shell, the shell upper end is equipped with big impression, the inside bellows that is equipped with of shell, bellows bottom internal fixation has insulating ply-yarn drill, insulating ply-yarn drill below connecting terminal pottery, the inside wire that is fixed with of shell, contact terminal is connected to the wire bottom, it is equipped with rubber wire loop and terminal pottery still to overlap on the wire, rubber wire loop upper end still is equipped with little impression, the contact terminal upper end is fixed in the terminal pottery, the connection pottery is connected to the contact terminal below, a plurality of square through-holes have been seted up to linking pottery upper end, it is equipped with circular recess to link up the pottery lower extreme, square through-hole with the contact terminal suits, circular recess with pottery B suits.

Further, rectangle through-holes have all been seted up at pottery A, powder ring one, powder ring two and pottery B middle part, rectangle through-hole suits with the chip, pottery B is integrated into one piece, pottery B comprises two sections cylinder first cylinder and second cylinder, the second cylinder diameter of pottery B bottom is greater than the first cylinder diameter of pottery B upper end.

Furthermore, the bottom of the contact terminal is fixedly contacted with the contact sheets at the two sides of the upper end of the chip in the connecting ceramic.

Furthermore, the inner waste gas hood and the outer waste gas hood are fixed at the bottom of the hexagonal base in a welding connection mode.

The utility model has the advantages that,

(1) the ceramic fittings are used, so that the product is more high-temperature resistant, stronger in practicability and better in performance.

(2) The chip comprises a diffusion barrier channel structure, and oxygen in the waste gas can be filtered into the gas cavity through the diffusion barrier channel, so that the oxygen content in the waste gas can be more accurately reflected. The device is used for quantitatively detecting the air-fuel ratio of the tail gas, and can enable the vehicle to meet the national emission requirements of six countries.

(3) The insulating line card is added, so that the product can be continuously and normally used even under a high-temperature environment.

(4) Set up two gas cavity, realize consulting the contrast effect, avoid external tail gas to pollute inside the chip.

Drawings

Fig. 1 is a schematic structural diagram of a wide-area exhaust gas sensor with a dual-gas cavity chip according to the present invention.

Fig. 2 is an exploded view of a wide-area exhaust gas sensor with a dual gas cavity chip according to the present invention.

Fig. 3 is a schematic structural diagram of a wide-area exhaust gas sensor with a dual-gas cavity chip according to the present invention.

Fig. 4 is a cross-sectional view of a wide-area exhaust gas sensor with a dual gas cavity chip according to the present invention.

1-short sensor; 2-a wire harness; 11-a hexagonal base; 12-a sealing gasket; 13-inner exhaust hood; 14-outer exhaust hood; 15-chip; 151-electrode contact; 152-an outer electrode; 153-conductive coating; 154-inlet hole; 155-diffusion barrier channel; 156-first gas chamber; 157-a second gas chamber; 16-ceramic A; 17-powder ring one; 18-pink ring II; 19-ceramic B; 21-a housing; 22-a bellows; 23-a wire; 24-small embossing; 25-rubber wire loop; 26-large stamping; 27-an insulated line card; 28-terminal ceramic; 29-linked ceramics; 210-contact terminals.

Detailed Description

In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand, the present invention will be further described with reference to the drawings and the specific embodiments.

As shown in fig. 1-4, the utility model provides a wide area type tail gas sensor with two gas cavity chips, including short sensor and pencil, short sensor includes the hexagonal base, the inside chip that is equipped with of hexagonal base, the inside inner electrode and the heating circuit of being equipped with of chip, the chip upper end is equipped with the electrode contact, the chip lower extreme is equipped with the outer electrode, the electrode contact with the outer electrode is connected through conductive coating, the outer electrode middle part is equipped with the inlet port, the diffusion barrier passageway is connected to the inlet port, the inside barrier ceramic that is equipped with of diffusion barrier passageway, diffusion barrier passageway connects first gas cavity, first gas cavity rear still is equipped with the second gas cavity, the chip overlaps in proper order from bottom to top is equipped with pottery A, powder ring one, powder ring two and pottery B, pottery A, powder ring one, And the powder ring II and the ceramic B are pressed into the hexagonal base through a pressing device, and the chip structure is used for quantitatively detecting the air-fuel ratio of the tail gas.

The diffusion barrier channel can filter oxygen in the waste gas to the gas cavity, and oxygen content in the waste gas is reacted out to more accurate for carry out quantitative determination to tail gas air-fuel ratio, can make the vehicle satisfy six emission requirements in state, and set up two gas cavities, realized referring to the contrast effect, avoid external tail gas to pollute inside the chip.

Furthermore, a sealing washer is sleeved at the lower end of the hexagonal base, an inner waste gas hood is connected below the hexagonal base, the inner waste gas hood is of a uncovered cylindrical structure, a plurality of air holes are formed in the side wall of the inner waste gas hood, an outer waste gas hood is sleeved outside the inner waste gas hood, and a plurality of air holes are formed in the bottom of the outer waste gas hood;

The ceramic fittings are integrally used, so that the performance of the product in the aspects of high temperature resistance and practicability is greatly improved, the insulating wire clamp ensures that the product can be continuously used in a high-temperature environment, and the stability of the product is ensured.

Furthermore, the connection mode of the wire harness and the hexagonal base is welding connection.

The installation principle is as follows: the ceramic A, the powder ring I, the powder ring II and the ceramic B are sequentially sleeved on the chip from bottom to top, then the ceramic A, the powder ring I, the powder ring II and the ceramic B are pressed to the opening end of the hexagonal base through a pressing device such as a pressing air cylinder, a corrugated pipe is arranged in the shell, a large stamp is arranged on the corrugated pipe, then a wire is arranged in the corrugated pipe, the wire of the wire harness sequentially penetrates through the rubber wire ring, the insulating wire clamp and the terminal ceramic from top to bottom, a small stamp is further arranged on the rubber wire ring, one end of the wire is connected with a contact terminal at the terminal ceramic, the contact terminal at the terminal ceramic is inserted into the connecting ceramic, an electrode end of the chip is inserted into the connecting ceramic to enable the chip to be contacted with the contact terminal, finally the shell and the hexagonal base are welded into a whole, and the threaded end of the hexagonal base is sleeved with the sealing washer and welded with the inner waste gas hood and the outer waste gas hood.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The wide-area tail gas sensor with the double-gas cavity chip is characterized by comprising a short sensor (1) and a wire harness (2), wherein the short sensor (1) comprises a hexagonal base (11), a chip (15) is arranged inside the hexagonal base (11), an inner electrode and a heating circuit are arranged inside the chip (15), an electrode contact (151) is arranged at the upper end of the chip (15), an outer electrode (152) is arranged at the lower end of the chip (15), the electrode contact (151) and the outer electrode (152) are connected through a conductive coating (153), an air inlet hole (154) is formed in the middle of the outer electrode (152), the air inlet hole (154) is connected with a diffusion barrier channel (155), barrier ceramics are arranged inside the diffusion barrier channel (155), the diffusion barrier channel (155) is connected with a first gas cavity (156), a second gas cavity (157) is further arranged behind the first gas cavity (156), the chip (15) is sequentially sleeved with a ceramic A (16), a powder ring I (17), a powder ring II (18) and a ceramic B (19) from bottom to top, and the ceramic A (16), the powder ring I (17), the powder ring II (18) and the ceramic B (19) are pressed into the hexagonal base (11) through a pressing device.

2. The wide-area exhaust gas sensor with the double-gas-cavity chip as claimed in claim 1, wherein a sealing washer (12) is sleeved on the lower end of the hexagonal base (11), an inner exhaust gas hood (13) is connected below the hexagonal base (11), the inner exhaust gas hood (13) is of a uncovered cylinder structure, a plurality of air holes are formed in the side wall of the inner exhaust gas hood (13), an outer exhaust gas hood (14) is sleeved outside the inner exhaust gas hood (13), and a plurality of air holes are formed in the bottom of the outer exhaust gas hood (14).

3. The wide-area exhaust gas sensor with the double-gas-cavity chip according to claim 1, wherein the wire harness (2) is located above the segment sensor, the wire harness (2) comprises a shell (21), a large stamp (26) is arranged at the upper end of the shell (21), a corrugated tube (22) is arranged inside the shell (21), an insulating wire clamp (27) is fixed inside the bottom end of the corrugated tube (22), a terminal ceramic (28) is connected below the insulating wire clamp (27), a lead (23) is fixed inside the shell (21), a contact terminal (210) is connected at the bottom end of the lead (23), a rubber wire ring (25) and the terminal ceramic (28) are further sleeved on the lead (23), a small stamp (24) is further arranged at the upper end of the rubber wire ring (25), and the upper end of the contact terminal (210) is fixed on the terminal ceramic (28), the contact terminal (210) below is connected and is linked up pottery (29), a plurality of square through-holes have been seted up to linking pottery (29) upper end, linking pottery (29) lower extreme is equipped with circular recess, square through-hole with contact terminal (210) suits, circular recess with pottery B (19) suits.

4. The wide-area exhaust gas sensor with a double-gas-cavity chip according to claim 1, wherein rectangular through holes are formed in the middle of the ceramic A (16), the powder ring I (17), the powder ring II (18) and the ceramic B (19), the rectangular through holes are matched with the chip (15), the ceramic B (19) is integrally formed, the ceramic B (19) is composed of a first cylinder and a second cylinder which are two sections of cylinders, and the diameter of the second cylinder at the bottom end of the ceramic B (19) is larger than that of the first cylinder at the upper end of the ceramic B (19).

5. The wide-area exhaust gas sensor with a dual-gas-chamber chip as claimed in claim 3, wherein the bottom of the contact terminal (210) is fixedly contacted with the electrode contacts (151) on both sides of the upper end of the chip (15) in the connecting ceramic (29), and the electrical connection is made through the connecting ceramic (29) and the lead (23).

6. The wide-area exhaust gas sensor with the double-gas-cavity chip as claimed in claim 2, wherein the inner exhaust gas hood (13) and the outer exhaust gas hood (14) are fixed to the bottom of the hexagonal base (11) by welding connection.