Oxygen sensor

Abstract

The utility model relates to the technical field of oxygen sensors, and particularly discloses an oxygen sensor which is characterized in that middle ceramic matched with a chip in a limiting manner is arranged between pressed powder, and the middle ceramic is tightly matched with the interior of a base in a limiting manner; the rear ceramic is provided with a plurality of circular grooves, the rear ceramic can be effectively prevented from being in contact with the four corners of the chip through the circular grooves, the product quality can be effectively prevented from being affected due to the fact that the rear ceramic is in contact with the rear ceramic when the rear ceramic is installed in the hexagonal base in a pre-pressing mode, and the service life of the rear ceramic is prolonged. Therefore, the chip is further prevented from being broken.

Description

Technical Field

[0001] The utility model relates to the technical field of oxygen sensors, in particular to an oxygen sensor. Background Art

[0002] With the continuous improvement of automobile emission requirements, oxygen sensors are essential components for engines that use three-way catalytic converters to reduce exhaust pollution. The oxygen sensor installed on the engine tests the concentration of oxygen in the exhaust gas and converts it into an electrical signal to feed back to the ECU control unit, accurately controlling the increase or decrease of the injector injection amount, and controlling the air-fuel ratio of the mixture near the theoretical value, so that the fuel can be burned more completely, improving exhaust emissions, saving fuel, and improving economy.

[0003] An oxygen sensor is usually assembled from a sensitive element (chip), a hexagonal base, front ceramics, rear ceramics, and a powder cake. In the prior art, when the front ceramics, the powder cake, and the rear ceramics are strung on the sensitive element (chip) and then pre-pressed into the hexagonal base, the front ceramics, the powder cake, and the rear ceramics cannot be positioned concentrically, which may cause the chip to come into relative contact with the front ceramics or the rear ceramics, making the chip easily break during pre-pressing installation.

[0004] The technical problem to be solved by the present application is: to design an oxygen sensor that can reduce the chip breakage rate when the front ceramic, powder cake and rear ceramic are pre-pressed and installed. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, the purpose of the utility model is to provide an oxygen sensor that can reduce the chip breakage rate when the front ceramic, the powder cake and the rear ceramic are pre-pressed and installed.

[0006] The technical solution adopted by the utility model is: an oxygen sensor, including a base and a chip arranged in the base, the chip is provided with a front ceramic and a rear ceramic respectively limited therewith, a plurality of powder cakes are provided between the front ceramic and the rear ceramic and limited therewith, an intermediate ceramic is provided between the powder cakes and limited therewith for improving the concentricity of the front ceramic and the rear ceramic, the intermediate ceramic is closely limited therewith, and the rear ceramic is also provided with a circular groove for avoiding contact with the chip.

[0007] In some embodiments, both the front ceramic and the rear ceramic are provided with a first limiting hole, and the chip is limitedly matched with the first limiting hole.

[0008] In some embodiments, the powder cake and the middle ceramic are both provided with a second limiting hole, and the chip is limitedly matched with the second limiting hole.

[0009] In some embodiments, a base hole and a mounting groove connected to the base hole are provided in the base, and the rear ceramic includes a limiting portion and a mounting portion connected to the limiting portion, the limiting portion is limitedly matched with the base hole, and the mounting portion is limitedly matched with the mounting groove.

[0010] In some embodiments, the front ceramic, powder cake, middle ceramic and limiting portion are all cylindrical, and the diameters of the front ceramic, powder cake, middle ceramic and limiting portion are equal to the diameter of the base hole, and the front ceramic, powder cake and middle ceramic are limited in cooperation with the base hole.

[0011] In some embodiments, the first limiting hole is rectangular, and the circular grooves are located at four corners of the first limiting hole on the rear ceramic.

[0012] In some embodiments, the upper and lower ends of the powder cake are provided with corresponding positioning grooves, and the upper and lower ends of the middle ceramic are provided with corresponding first positioning blocks, and the first positioning blocks are engaged with the positioning grooves.

[0013] In some embodiments, a second positioning block is provided at the upper end of the front ceramic and the lower end of the rear ceramic, and the second positioning block is respectively engaged with a positioning groove on the powder cake near one end thereof.

[0014] In some embodiments, the base is further provided with a protective cover connected thereto in a locking manner, the protective cover is further provided with an outer cover body engaged therewith in a locking manner, the protective cover is provided with a locking portion, and the outer cover body engages therewith in a locking manner.

[0015] The utility model has the following technical effects: by arranging an intermediate ceramic between the powder cakes to limit the chip, and making the intermediate ceramic tightly limit the inside of the base, the chip can be positioned to prevent it from deflecting when pre-pressed and installed in the hexagonal base and thus contacting the rear ceramic, thereby causing the chip to break and affecting product quality, and a plurality of circular grooves are also provided on the rear ceramic. The circular grooves can effectively prevent the rear ceramic from contacting the four corners of the chip, thereby further preventing the chip from breaking. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of the oxygen sensor of the utility model;

[0017] Figure 2 This is a schematic diagram of the bottom structure of the base of the oxygen sensor of the utility model;

[0018] Figure 3 This is a schematic diagram of the exploded structure of the oxygen sensor of the utility model;

[0019] Figure 4 This is a schematic diagram of the rear ceramic structure of the oxygen sensor of the utility model;

[0020] Figure 5 The figure is a schematic diagram of the rear ceramic structure of the oxygen sensor of the utility model.

[0021] The numbers and names in the figure correspond to each other as follows: 1. base; 2. chip; 3. front ceramic; 4. rear ceramic; 5. powder cake; 6. middle ceramic; 40. circular groove; 30. first limiting hole; 50. second limiting hole; 10. base hole; 11. mounting groove; 41. limiting part; 42. mounting part; 20. positioning groove; 60. first positioning block; 31. second positioning block; 12. protective cover; 13. outer cover; 14. locking part. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] See also Figure 1-5 The utility model provides a technical solution: an oxygen sensor, comprising a base 1 and a chip 2 arranged in the base 1, the chip 2 is provided with a front ceramic 3 and a rear ceramic 4 respectively limited therewith, two powder cakes 5 limited therewith the chip 2 are arranged between the front ceramic 3 and the rear ceramic 4, an intermediate ceramic 6 limited therewith the chip 2 for improving the concentricity of the front ceramic 3 and the rear ceramic 4 is arranged between the two powder cakes 5, a first limiting hole 30 is provided on the front ceramic 3 and the rear ceramic 4, the chip 2 is limited therewith the front ceramic 3 and the rear ceramic 4 respectively by limiting therewith the first limiting hole 30, and a second limiting hole 50 is provided on the powder cake 5 and the intermediate ceramic 6, the chip 2 is limited therewith the powder cake 5 and the intermediate ceramic 6 respectively by limiting therewith the second limiting hole 50, when the oxygen sensor needs to be assembled, First, pass the chip 2 through the second limiting hole 50 on the middle ceramic 6 and cooperate with the middle ceramic 6, and then the upper and lower ends of the chip 2 respectively pass through the second limiting holes 50 on the powder cake 5 and cooperate with the powder cake 5. There are two powder cakes 5, and the two powder cakes 5 are respectively arranged at the upper and lower ends of the middle ceramic 6, and the upper and lower ends of the powder cake 5 are provided with corresponding positioning grooves 20, and the upper and lower ends of the middle ceramic 6 are provided with corresponding first positioning blocks 60. The first positioning blocks 60 are engaged with the positioning groove 20. By making the first positioning blocks 60 at the upper and lower ends of the middle ceramic 6 respectively engage with the positioning groove 20 on the powder cake 5 close to one end thereof, it is possible to avoid the powder cake 5 and the middle ceramic 6 from rotating in position during pre-pressing installation, thereby causing wear and fracture of the chip 2, and further preventing the chip 2 from fracture.

[0024] After the powder cake 5 and the middle ceramic 6 are strung on the chip 2 and installed, the front ceramic 3 and the rear ceramic 4 are then strung on the chip 2 from the upper and lower ends of the chip 2, respectively, by passing the upper and lower ends of the chip 2 through the first limiting holes 30 on the front ceramic 3 and the rear ceramic 4, respectively, so as to limit the front ceramic 3 and the rear ceramic 4 respectively. A second positioning block 31 is provided at the upper end of the front ceramic 3 and the lower end of the rear ceramic 4. After the front ceramic 3 and the rear ceramic 4 are respectively strung in from the upper and lower ends of the chip 2, the second positioning blocks 31 on the front ceramic 3 and the rear ceramic 4 are respectively engaged with the positioning groove 20 on the powder cake 5 near one end thereof, so that when the chip 2 is pre-pressed and installed, the rotation between the front ceramic 3 or the rear ceramic 4 and the powder cake 5 can be avoided, thereby causing wear and fracture of the chip 2, and further preventing the chip 2 from breaking during pre-pressing and installation.

[0025] A base hole 10 and a mounting groove 11 connected to the base hole 10 are provided in the base 1, and the rear ceramic 4 includes a limiting portion 41 and a mounting portion 42 connected to the limiting portion 41. After the intermediate ceramic 6, the powder cake 5, the front ceramic 3 and the rear ceramic 4 are all strung on the chip 2, and then the end of the chip 2 strung with the front ceramic 3 is embedded in the base hole 10 from the mounting groove 11 for pre-pressing installation. The front ceramic 3, the powder cake 5, the intermediate ceramic 6 and the limiting portion 41 are all cylindrical. After the pre-pressing installation is completed, the limiting portions 41 on the front ceramic 3 and the rear ceramic 4, the powder cake 5 and the intermediate ceramic 6 are all in the base hole 10 and are limited in cooperation with the base hole 10, and the mounting portion 42 on the rear ceramic 4 is located in the mounting groove 11 and is limited in cooperation with it. , and because the diameters of the front ceramic 3, the powder cake 5, the middle ceramic 6 and the limiting portion 41 are all equal to the diameter of the base hole 10, when the chip 2 is pre-pressed and installed in the base 1, the middle ceramic 6 and the inner wall of the base hole 10 are tightly limited and matched to position the chip 2 first, thereby improving the concentricity between the front ceramic 3 and the rear ceramic 4, thereby avoiding the deflection of the rear ceramic 4 and causing wear and tear on the chip 2. After the pre-pressing installation is completed, the front ceramic 3, the powder cake 5, the middle ceramic 6 and the limiting portion 41 on the rear ceramic 4 are all tightly limited and matched with the inside of the base hole 10, so that the chip 2 can be positioned in the base 1 without shaking, thereby avoiding the chip 2 from touching other parts and causing wear and tear.

[0026] The cross-section of the first limiting hole 30 is rectangular, and a circular groove 40 is provided at each of the four corners of the first limiting hole 30 on the rear ceramic 4. By providing circular grooves 40 at the four corners of the first limiting hole 30 on the rear ceramic 4, the four corners of the chip 2 can be effectively prevented from contacting the inner wall of the first limiting hole 30 on the rear ceramic 4, thereby preventing the chip 2 from being worn and broken.

[0027] The base 1 is also provided with a protective cover 12 which is locked and connected thereto. The protective cover 12 is also provided with an outer cover body 13 which is locked and matched therewith for further protecting the internal structure of the product. A locking portion 14 is provided on the protective cover 12. The outer cover body 13 is locked and matched with the protective cover 12 by locking with the locking portion 14.

[0028] The working principle or beneficial effect of the utility model is as follows: by providing an intermediate ceramic 6 between the powder cakes 5 and cooperating with the chip 2 in a limited position, and making the intermediate ceramic 6 tightly cooperating with the base 1, the chip 2 can be positioned to prevent it from deflecting when pre-pressed and installed in the hexagonal base 1 and thus contacting with the rear ceramic 4, thereby causing the chip 2 to break and affecting the product quality, and a plurality of circular grooves 40 are also provided on the rear ceramic 4. The circular grooves 40 can effectively prevent the rear ceramic 4 from contacting with the four corners of the chip 2, thereby further preventing the chip 2 from breaking.

[0029] Finally, it should be noted that the above description is only a preferred example of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An oxygen sensor, comprising a base (1) and a chip (2) arranged in the base (1), characterized in that: The chip (2) is provided with a front ceramic (3) and a rear ceramic (4) respectively limited and matched therewith; a plurality of powder cakes (5) are provided between the front ceramic (3) and the rear ceramic (4) and limited and matched with the chip (2); an intermediate ceramic (6) is provided between the powder cakes (5) and limited and matched with the chip (2) for improving the concentricity of the front ceramic (3) and the rear ceramic (4); the intermediate ceramic (6) is tightly limited and matched with the base (1); and the rear ceramic (4) is also provided with a circular groove (40) for avoiding contact with the chip (2).

2. The oxygen sensor according to claim 1, characterized in that The front ceramic (3) and the rear ceramic (4) are both provided with a first limiting hole (30), and the chip (2) is limitedly matched with the first limiting hole (30).

3. The oxygen sensor according to claim 1, characterized in that The powder cake (5) and the middle ceramic (6) are both provided with a second limiting hole (50), and the chip (2) is limitedly matched with the second limiting hole (50).

4. The oxygen sensor according to claim 1, characterized in that The base (1) is provided with a base hole (10) and a mounting groove (11) connected to the base hole (10); the rear ceramic (4) comprises a limiting portion (41) and a mounting portion (42) connected to the limiting portion (41); the limiting portion (41) is in limiting cooperation with the base hole (10); and the mounting portion (42) is in limiting cooperation with the mounting groove (11).

5. The oxygen sensor according to claim 4, characterized in that The front ceramic (3), the powder cake (5), the middle ceramic (6) and the limiting portion (41) are all cylindrical, and the diameters of the front ceramic (3), the powder cake (5), the middle ceramic (6) and the limiting portion (41) are all equal to the diameter of the base hole (10). The front ceramic (3), the powder cake (5) and the middle ceramic (6) are limitedly matched with the base hole (10).

6. The oxygen sensor according to claim 2, characterized in that: The first limiting hole (30) is rectangular, and the circular grooves (40) are located at the four corners of the first limiting hole (30) on the rear ceramic (4).

7. The oxygen sensor according to claim 1, characterized in that The upper and lower ends of the powder cake (5) are both provided with corresponding positioning grooves (20), and the upper and lower ends of the middle ceramic (6) are both provided with corresponding first positioning blocks (60), and the first positioning blocks (60) are engaged with the positioning grooves (20).

8. The oxygen sensor according to claim 7, characterized in that The upper end of the front ceramic (3) and the lower end of the rear ceramic (4) are both provided with a second positioning block (31), and the second positioning block (31) is respectively engaged with a positioning groove (20) on the powder cake (5) close to one end thereof.

9. The oxygen sensor according to claim 1, characterized in that The base (1) is also provided with a protective cover (12) connected thereto in a locking position, the protective cover (12) is also provided with an outer cover body (13) engaged therewith in a locking position, the protective cover (12) is provided with a locking portion (14), and the outer cover body (13) is engaged therewith in a locking position.

Images