A central pre-compression structure for oxygen sensors
By designing a central pre-compression structure for the oxygen sensor, the problem of chip breakage caused by base offset was solved by using limiting and buffering design, thus achieving stable chip positioning and anti-fracture.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGZHOU MEIRUNTAO THERMAL ELECTRIC CO LTD
- Filing Date
- 2025-08-26
- Publication Date
- 2026-07-31
AI Technical Summary
During the production of oxygen sensors, the base is prone to tilting during pre-pressing, which can cause the chip to shift and break.
A central pre-compression structure for an oxygen sensor is designed, including a base, a fixed base, a pre-compression bottom mold, a central rubber ring, and a buffer rubber ring. The base offset and chip breakage are prevented through limiting fit and buffer design.
It effectively prevents the base from shifting during the pre-compression process, ensuring the chip is centered and avoiding displacement and breakage of the chip during pre-compression.
Smart Images
Figure CN224576265U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of oxygen sensor manufacturing technology, and in particular to a central pre-compression structure for oxygen sensors. Background Technology
[0002] When manufacturing oxygen sensors, the front and rear ceramics, powder cake, and chip are placed in a base, with the powder cake positioned between the front and rear ceramics. The base is then pressed using a pre-pressing head to compact the powder cake. However, due to current issues with the fit between the pre-pressing fixture and the base, the base is prone to shifting or tilting during pre-pressing. This causes the chip's center point to shift after pre-pressing, leading to chip breakage during subsequent assembly processes.
[0003] The technical problem to be solved by this application is: to design a central pre-pressing structure for an oxygen sensor that can ensure the stability of the base during stamping and thus prevent the chip from being damaged. Utility Model Content
[0004] In order to overcome the shortcomings of the prior art, the purpose of this utility model is to provide a central pre-pressing structure for oxygen sensors that can ensure the stability of the base during stamping and thus avoid damage to the chip.
[0005] The technical solution adopted by this utility model is as follows: a centering pre-compression structure for an oxygen sensor, including a base, a front ceramic, a rear ceramic and a powder cake inside the base, a chip being inserted between the front ceramic, the rear ceramic and the powder cake, a fixing seat that limits and cooperates with the base, a pre-compression bottom mold connected to the bottom of the fixing seat, a centering rubber ring for positioning the chip inside the pre-compression bottom mold, and a buffer rubber ring for preventing the chip from breaking inside the pre-compression bottom mold.
[0006] In some embodiments, the fixing base is provided with a first limiting groove, and the base and the first limiting groove are in a limiting sliding fit.
[0007] In some embodiments, the fixing base is further provided with a limiting through hole at one end communicating with the first limiting groove, and the other end of the limiting through hole is limited to the pre-pressed bottom mold.
[0008] In some embodiments, the pre-pressed bottom mold is provided with a second limiting groove, and one end of the rear ceramic is limited to fit with the second limiting groove.
[0009] In some embodiments, the pre-pressed bottom mold is provided with a third limiting groove that communicates with the second limiting groove. The diameter of the third limiting groove is smaller than the diameter of the second limiting groove, and the chip passes through the second limiting groove and the third limiting groove.
[0010] In some embodiments, a limiting platform is provided at the bottom of the second limiting groove, and the bottom end of the rear ceramic abuts against the limiting platform.
[0011] In some embodiments, the central rubber ring and the third limiting groove are mutually limitingly fitted, and the central rubber ring and the chip are mutually limitingly fitted.
[0012] In some embodiments, the bottom end of the pre-compression mold is also provided with a set screw that is threadedly connected thereto, and a buffer rubber ring is provided between the bottom end of the chip and the set screw.
[0013] This utility model has the following technical effects: By providing a fixed seat that fits with the base for limiting, the fixed seat can limit and fix the base during pre-pressing, thereby preventing the base from shifting and causing the chip to move. Furthermore, the bottom of the fixed seat is provided with a pre-pressing bottom mold, in which a centering rubber ring and a buffer rubber ring are respectively provided inside. The centering rubber ring can further center and position the chip to prevent it from shifting, while the buffer rubber ring can buffer the bottom of the chip, preventing the bottom of the chip from contacting the pre-pressing bottom mold during pre-pressing and causing it to break. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the central pre-compression structure of the present invention used in an oxygen sensor; Figure 2 This is a cross-sectional schematic diagram of the central pre-compression structure of the oxygen sensor according to this utility model.
[0015] The labels and names in the diagram correspond as follows: 1. Base; 10. Front ceramic; 11. Rear ceramic; 12. Powder compact; 13. Chip; 2. Fixing base; 3. Pre-compression bottom mold; 30. Centered rubber ring; 31. Buffer rubber ring; 20. First limiting groove; 21. Limiting through hole; 32. Second limiting groove; 33. Third limiting groove; 34. Limiting platform; 35. Ejector screw. Detailed Implementation
[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0017] Please see Figure 1-2This utility model provides a technical solution: a centering pre-compression structure for an oxygen sensor, including a base 1. The base 1 contains a front ceramic 10, a rear ceramic 11, and a powder cake 12, with the powder cake 12 located between the front ceramic 10 and the rear ceramic 11. A chip 13 passes through the front ceramic 10, the rear ceramic 11, and the powder cake 12. During the production of the oxygen sensor, the base 1 needs to be stamped to compact the powder cake 12 between the front ceramic 10 and the rear ceramic 11. The base 1 has a fixing seat 2 that provides a limiting fit. The bottom of the fixing seat 2 has a pre-compression bottom mold 3 connected to it. The interior of the pre-compression bottom mold 3 has a centering rubber ring 30 for positioning the chip 13. The bottom mold 3 is also equipped with a buffer rubber ring 31 to prevent the chip 13 from breaking. By providing a fixed seat 2 that is matched with the base 1 for limiting, the fixed seat 2 can limit and fix the base 1 during pre-pressing, thereby preventing the base 1 from shifting and causing the chip 13 to shift. The bottom of the fixed seat 2 is equipped with a pre-pressing bottom mold 3, in which a centering rubber ring 30 and a buffer rubber ring 31 are respectively provided. The centering rubber ring 30 can further center and position the chip 13 to prevent it from shifting, while the buffer rubber ring 31 can buffer the bottom of the chip 13 to prevent the bottom of the chip 13 from contacting the pre-pressing bottom mold 3 during pre-pressing and causing it to break.
[0018] The fixed seat 2 is provided with a first limiting groove 20. When the base 1 is stamped, the base 1 slides along the first limiting groove 20. By providing the fixed seat 2 to limit the base 1, the base 1 can be effectively prevented from shifting during stamping.
[0019] The fixing base 2 is also provided with a limiting through hole 21 at one end communicating with the first limiting groove 20, wherein the other end of the limiting through hole 21 is limited to the pre-pressing bottom mold 3. The pre-pressing bottom mold 3 is also provided with a second limiting groove 32, wherein one end of the rear ceramic 11 is limited to the second limiting groove 32. The pre-pressing bottom mold 3 is also provided with a third limiting groove 33 communicating with the second limiting groove 32, wherein the diameter of the third limiting groove 33 is smaller than the diameter of the second limiting groove 32. The chip 13 passes through the second limiting groove 32 and the third limiting groove 33. Since the diameter of the third limiting groove 33 is smaller than the diameter of the second limiting groove 32, a limiting platform 34 is formed at the bottom of the second limiting groove 32. The bottom end of the rear ceramic 11 abuts against the limiting platform 34. When the base 1 is stamped, the limiting platform 34 can support the rear ceramic 11, thereby facilitating the compaction of the powder cake 12 located between the front ceramic 10 and the rear ceramic 11.
[0020] The central rubber ring 30 is installed in the third limiting groove 33 and is in a limiting fit with the third limiting groove 33. Since the chip 13 passes through the third limiting groove 33, the central rubber ring 30 and the chip 13 are in a limiting fit, thereby preventing the chip 13 from shifting during stamping.
[0021] The bottom end of the pre-pressing mold 3 is also provided with a set screw 35 threadedly connected to it. The buffer ring 31 is located between the bottom end of the chip 13 and the set screw 35. Since the pre-pressing mold 3 and the fixed base 2 are both made of metal, in order to avoid the chip 13 from being squeezed due to contact between the chip 13 and the pre-pressing mold 3 during the stamping process, the buffer ring 31 is provided to contact the bottom end of the chip 13. The buffer ring 31 can be used to buffer the pressure on the bottom end of the chip 13, thereby preventing the chip 13 from being squeezed and breaking. In addition, the middle of the set screw 35 is hollow, which allows the powder residue 12 that falls off during the pre-pressing process to fall out of the tooling through the middle of the set screw 35, instead of accumulating at the bottom of the pre-pressing mold 3.
[0022] The working principle of this utility model is as follows: By providing a fixed seat 2 that is matched with the base 1 for limiting, the fixed seat 2 can limit and fix the base 1 during pre-pressing, thereby preventing the base 1 from shifting and causing the chip 13 to shift. The bottom of the fixed seat 2 is provided with a pre-pressing bottom mold 3, wherein the interior of the pre-pressing bottom mold 3 is provided with a centering rubber ring 30 and a buffer rubber ring 31. The centering rubber ring 30 can further center and position the chip 13 to prevent it from shifting, while the buffer rubber ring 31 can buffer the bottom of the chip 13 to prevent the bottom of the chip 13 from contacting the pre-pressing bottom mold 3 during pre-pressing and causing it to break.
[0023] Finally, it should be noted that the above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A centrally pre-compressed structure for an oxygen sensor, comprising a base, wherein a front ceramic, a rear ceramic, and a powder cake are disposed within the base, and a chip is disposed between the front ceramic, the rear ceramic, and the powder cake, characterized in that, The base is provided with a fixed seat that limits its positioning. The bottom of the fixed seat is provided with a pre-compression bottom mold that is connected to it. The interior of the pre-compression bottom mold is provided with a centering rubber ring for positioning the chip. The interior of the pre-compression bottom mold is also provided with a buffer rubber ring for preventing the chip from breaking.
2. The centering pre-press structure for an oxygen sensor according to claim 1, characterized by, The fixed base is provided with a first limiting groove, and the base and the first limiting groove are in a limiting sliding fit.
3. The centering pre-press structure for an oxygen sensor according to claim 2, characterized by, The fixed base is also provided with a limiting through hole at one end that is connected to the first limiting groove, and the other end of the limiting through hole is limited to the pre-pressed bottom mold.
4. The centering pre-press structure for an oxygen sensor according to claim 1, characterized by, The pre-pressed bottom mold is provided with a second limiting groove, and one end of the rear ceramic is limited to fit with the second limiting groove.
5. The centering pre-press structure for an oxygen sensor according to claim 4, characterized by, The pre-pressed bottom mold is provided with a third limiting groove that communicates with the second limiting groove. The diameter of the third limiting groove is smaller than the diameter of the second limiting groove, and the chip passes through the second limiting groove and the third limiting groove.
6. The centering pre-compression structure for an oxygen sensor according to claim 4, characterized in that, The bottom of the second limiting groove is provided with a limiting platform, and the bottom end of the rear ceramic abuts against the limiting platform.
7. The centering pre-press structure for an oxygen sensor according to claim 5, characterized by, The central rubber ring and the third limiting groove are mutually limitingly fitted, and the central rubber ring and the chip are mutually limitingly fitted.
8. The centering pre-press structure for an oxygen sensor according to claim 1, characterized by, The bottom end of the pre-compression mold is also provided with a set screw that is threadedly connected to it, and the buffer rubber ring is located between the bottom end of the chip and the set screw.