Self-insulating tubular oxygen sensor

Abstract

This utility model relates to the field of oxygen sensors, particularly self-insulating tubular oxygen sensors. The oxygen sensor includes a zirconium tube element, a main sleeve, a connecting electrode, a high-temperature wire, an electrode support, a probe sleeve, and a hexagonal base. The probe sleeve and the hexagonal base are fixedly connected together. The zirconium tube element is fitted inside the probe sleeve and the hexagonal base. The rear end of the hexagonal base is fitted inside the main sleeve. The top end of the connecting electrode is fixed inside the hexagonal base via the electrode support. The tail end of the connecting electrode is connected to the high-temperature wire. The front end of the connecting electrode makes spring-loaded contact with the zirconium tube element. The zirconium tube element has a single step with an insulating layer at the step. This utility model avoids stress concentration and breakage during press-fitting by using a single step on the zirconium tube element. The electrode support and the front end sleeve are integrally riveted and directly sealed with powder, thereby reducing uneven stress.

Description

Technical Field

[0001] This utility model relates to the field of oxygen sensors, and in particular to self-insulating tube type oxygen sensors. Background Technology

[0002] The automotive oxygen sensor is a critical feedback sensor in the electronic fuel injection engine control system. It is a key component for controlling vehicle exhaust emissions, reducing environmental pollution, and improving fuel combustion quality. Oxygen sensors are typically mounted on the engine exhaust pipe. However, existing oxygen sensors, such as the tubular automotive oxygen sensor assembly and sensing zirconium tube described in application number CN2020534153.5, use a ceramic insulator as the electrode support. During the direct compression of the ceramic block, uneven stress can easily cause cracks. Furthermore, the sensing zirconium tube employs a traditional double-step positioning structure. During the compaction of the sealing powder, stress concentration can easily occur at the upper step, leading to breakage of the zirconium tube element. Additionally, the upper step design makes the zirconium tube element molding process difficult. Utility Model Content

[0003] To overcome the shortcomings of existing oxygen sensors, which are complex in structure and difficult to mold, this invention provides a self-insulating tube-type oxygen sensor.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a self-insulating tubular oxygen sensor, including a zirconium tube element, a main sleeve, a connecting electrode, a high-temperature wire, an electrode support, a probe sleeve, and a hexagonal base. The probe sleeve and the hexagonal base are fixedly connected together. The zirconium tube element is sleeved and connected inside the probe sleeve and the hexagonal base. The rear end of the hexagonal base is sleeved inside the main sleeve. The top end of the connecting electrode is fixed inside the hexagonal base through the electrode support. The tail end of the connecting electrode is connected to the high-temperature wire. The front end of the connecting electrode is in spring-loaded contact with the zirconium tube element. The zirconium tube element has a single step, and an insulating layer is provided at the step.

[0005] According to another embodiment of the present invention, the electrode support is further riveted to the hexagonal base.

[0006] According to another embodiment of the present invention, the hexagonal base, electrode support, zirconium tube element, and sealing powder are provided between the electrode support.

[0007] According to another embodiment of the present invention, the main sleeve is further provided with a sealing plug at its tail end, and the sealing plug is provided with a vent hole.

[0008] According to another embodiment of the present invention, the sealing plug is further provided with a vent tube in its inner cavity, a vent membrane is provided between the vent tube and the inner cavity of the sealing plug, and the inner cavity of the sealing plug is connected to the vent hole of the sealing plug.

[0009] According to another embodiment of the present invention, the sealing plug is further provided with a positioning step for limiting the vent tube at one end of its inner cavity and a tapered opening at the other end.

[0010] According to another embodiment of the present invention, the connecting electrode is further connected to a high-temperature wire via a lead connector.

[0011] The beneficial effects of this utility model are that it avoids stress concentration and breakage during the pressing process by setting a single step on the zirconium tube element, and the electrode support and the front end sleeve are riveted together and directly sealed with powder, thereby reducing uneven stress. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the structure of the zirconium tube element of this utility model;

[0015] Figure 3 This is a structural schematic diagram of the positioning step and conical opening of this utility model;

[0016] In the diagram: 1. Zirconium tube element, 2. Front end sleeve, 3. Main sleeve, 4. Connecting electrode, 5. High-temperature wire, 6. Step, 7. Insulation layer, 8. Electrode support, 9. Sealing powder, 10. Sealing plug, 11. Vent tube, 12. Vent membrane, 13. Vent hole, 14. Positioning step, 15. Conical opening, 16. Lead connector, 21. Probe sleeve, 22. Hexagonal base. Detailed Implementation

[0017] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the zirconium tube element of this utility model. Figure 3 This is a schematic diagram of the positioning step and conical opening of this utility model.

[0018] Combined with appendix Figure 1 and attached Figure 2As shown, the device includes a zirconium tube element 1, a main sleeve 3, a connecting electrode 4, a high-temperature wire 5, an electrode support 8, a probe sleeve 21, and a hexagonal base 22. The probe sleeve 21 and the hexagonal base 22 are fixedly connected together. The zirconium tube element 1 is sleeved and connected inside the probe sleeve 21 and the hexagonal base 22. The rear end of the hexagonal base 22 is sleeved inside the main sleeve 3. The top end of the connecting electrode 4 is fixed inside the hexagonal base 22 through the electrode support 8. The tail end of the connecting electrode 4 is connected to the high-temperature wire 5. The front end of the connecting electrode 4 is in spring-loaded contact with the zirconium tube element 1. The zirconium tube element 1 has a single step 6, and an insulating layer 7 is provided at the step 6.

[0019] Insulation between the zirconium tube element 1 and the hexagonal base 22 is achieved through the insulating layer 7.

[0020] The electrode support 8 is riveted to the hexagonal base 22.

[0021] A sealing powder 9 is provided between the hexagonal base 22, the electrode support 8, the zirconium tube element 1, and the electrode support 8. By using a single step 6, when the sealing powder 9 is directly compacted by the electrode support 8, stress concentration will not occur at the step 6, thus preventing the zirconium tube element from breaking, and the installation efficiency is improved.

[0022] The main sleeve 3 is provided with a sealing plug 10 at its tail end, and the sealing plug 10 is provided with a vent hole 13.

[0023] The inner cavity of the sealing plug 10 is provided with a vent tube 11, and a vent membrane 12 is provided between the vent tube 11 and the inner cavity of the sealing plug 10. The inner cavity of the sealing plug 10 is connected to the vent hole 13 of the sealing plug 10.

[0024] As attached Figure 2 As shown, the inner cavity of the sealing plug 10 has a positioning step 14 at one end for limiting the vent tube 11, and a conical opening 15 at the other end. After the vent tube 11 is inserted into the sealing plug 10, one end of the vent tube 11 is deformed by the conical opening 15, and the other end rests on the positioning step 14, thereby embedding the vent tube 11 and the breathable membrane 12 therein, achieving self-fixation of the vent tube 11 while satisfying the waterproof and breathable functions.

[0025] The connecting electrode 4 is connected to the high-temperature wire 5 through the lead connector 16.

Claims

1. A self-insulating tubular oxygen sensor, characterized in that, The device includes a zirconium tube element (1), a main sleeve (3), a connecting electrode (4), a high-temperature wire (5), an electrode support (8), a probe sleeve (21), and a hexagonal base (22). The probe sleeve (21) and the hexagonal base (22) are fixedly connected together. The zirconium tube element (1) is fitted and connected inside the probe sleeve (21) and the hexagonal base (22). The rear end of the hexagonal base (22) is fitted inside the main sleeve (3). The top end of the connecting electrode (4) is fixed inside the hexagonal base (22) through the electrode support (8). The tail end of the connecting electrode (4) is connected to the high-temperature wire (5). The front end of the connecting electrode (4) is in spring-press contact with the zirconium tube element (1). The zirconium tube element (1) has a single step (6), and an insulating layer (7) is provided at the step (6).

2. The self-insulating tubular oxygen sensor according to claim 1, characterized in that, The electrode support (8) is riveted to the hexagonal base (22).

3. The self-insulating tubular oxygen sensor according to claim 2, characterized in that, Sealing powder (9) is provided between the hexagonal base (22), electrode support (8), zirconium tube element (1), and electrode support (8).

4. The self-insulating tubular oxygen sensor according to claim 1, characterized in that, The main sleeve (3) is provided with a sealing plug (10) at its tail end, and the sealing plug (10) is provided with a vent hole (13).

5. The self-insulating tubular oxygen sensor according to claim 4, characterized in that, The inner cavity of the sealing plug (10) is provided with a vent tube (11), and a vent membrane (12) is provided between the vent tube (11) and the inner cavity of the sealing plug (10). The inner cavity of the sealing plug (10) is connected to the vent hole (13) of the sealing plug (10).

6. The self-insulating tubular oxygen sensor according to claim 5, characterized in that, The inner cavity of the sealing plug (10) is provided with a positioning step (14) for limiting the vent tube (11) at one end and a conical opening (15) at the other end.

7. The self-insulating tubular oxygen sensor according to claim 1, characterized in that, The connecting electrode (4) is connected to the high-temperature wire (5) through the lead connector (16).

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