Modular compact oxygen sensor

Abstract

The invention relates to the field of sensors, in particular to a modular compact oxygen sensor. The sensor comprises a hexagonal shell, an induction core body and a wire harness mechanism, the hexagonal shell and the wire harness mechanism are connected together in a welded mode, the induction core body is installed in the hexagonal shell and the wire harness mechanism, the induction core body and the hexagonal shell are welded together, and the induction core body is of an integrated sealing structure. The hexagonal shell, the induction core body and the main sleeve are connected together in a welded mode, rapid and flexible combination is achieved, and the requirement for multi-variety and small-batch production is met. And the induction core body is integrally and tightly packaged, so that the induction element can isolate and seal tail gas and lead out all functional signal loops.

Description

Technical Field

[0001] The present invention relates to the field of sensors, and more particularly to a modular compact oxygen sensor. Background Art

[0002] Automotive oxygen sensors are key feedback sensors in the electronic fuel injection engine control system, and are key components for controlling automotive exhaust emissions, reducing environmental pollution caused by automobiles, and improving the fuel combustion quality of automotive engines. Oxygen sensors are all installed on the engine exhaust pipe. The existing vehicle oxygen sensor assemblies generally adopt the structure and process of directly sealing the sensing element with a hexagonal seat, and are composed of two major parts: a hexagonal sealing body and a wiring harness, which are suitable for large-scale vertical integrated production models, but it is difficult to adapt to the production requirements of multi-variety and small-batch, and the cost is relatively high. Summary of the Invention

[0003] In order to overcome the deficiency of high cost in small-batch production of existing sensors, the present invention provides a modular compact oxygen sensor.

[0004] The technical solution adopted by the present invention to solve its technical problems is: A modular compact oxygen sensor includes a hexagonal housing, a sensing core, and a wiring harness mechanism. The hexagonal housing is welded to the wiring harness mechanism, the sensing core is installed in the hexagonal housing and the wiring harness mechanism, the sensing core is welded to the hexagonal housing, and the sensing core is an integrated sealed structure.

[0005] According to another embodiment of the present invention, further comprising that the sensing core includes a sensing element, a sealing seat, a sealing member, an electrode support, and an electrode. The sealing seat is cylindrical, the sealing member and the electrode support are integrally encapsulated in the sealing seat, the electrode is in contact with the sensing element, and the sensing element passes through the sealing member.

[0006] According to another embodiment of the present invention, further comprising that the sealing member includes sealing powder, an insulating ring, and a washer. The insulating ring and the washer are respectively attached to the openings at the front and rear ends of the sealing seat, and the sealing powder is located between the insulating ring and the electrode support.

[0007] According to another embodiment of the present invention, further comprising that the electrode is a round wire.

[0008] According to another embodiment of the present invention, further comprising that the hexagonal housing includes a probe sleeve and a hexagonal seat. The probe sleeve is connected to the front end of the hexagonal seat, and the hexagonal seat is welded to the sealing seat.

[0009] According to another embodiment of the present invention, further comprising that the wiring harness mechanism includes a main sleeve, a lead connector, a high-temperature wire, and a connector. The main sleeve is welded to the hexagonal seat, the electrode is connected to one end of the high-temperature wire through the lead connector, and the other end of the high-temperature wire is connected to the connector.

[0010] According to another embodiment of the present invention, it further includes that a sealing plug is provided between the lead joint and the high-temperature wire.

[0011] According to another embodiment of the present invention, it further includes that a silica gel sleeve is wrapped around the high-temperature wire.

[0012] According to another embodiment of the present invention, it further includes that the welding method between the hexagonal shell and the wire harness mechanism is laser welding or argon arc welding or plasma welding, and the welding method between the induction core and the hexagonal shell is laser welding or argon arc welding or plasma welding.

[0013] The beneficial effects of the present invention are as follows: By welding and connecting the hexagonal shell, the induction core, and the main sleeve together, rapid and flexible combination is achieved, meeting the requirements of multi-variety and small-batch production. Through the integrated and tight encapsulation of the induction core, the induction element is isolated and sealed from the exhaust gas, and the lead-out of each functional signal circuit is realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described below in conjunction with the drawings and embodiments.

[0015] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is a schematic structural diagram of the induction core of the present invention; Figure 3 is a schematic structural diagram of the electrode of the present invention; In the figure, 1. hexagonal shell, 2. induction core, 3. wire harness mechanism, 11. probe sleeve, 12. hexagonal seat, 21. induction element, 22. sealing seat, 23. sealing powder, 24. electrode support, 25. electrode, 26. insulating ring, 27. washer, 31. main sleeve, 32. lead joint, 33. high-temperature wire, 34. connector, 35. sealing plug, 36. silica gel sleeve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is a schematic structural diagram of the induction core of the present invention; Figure 3 is a schematic structural diagram of the electrode of the present invention.

[0017] A modular and compact oxygen sensor includes a hexagonal shell 1, an induction core 2, and a wire harness mechanism 3. The hexagonal shell 1 is welded and connected to the wire harness mechanism 3. The induction core 2 is installed inside the hexagonal shell 1 and the wire harness mechanism 3, and the induction core 2 is welded to the hexagonal shell 1. The induction core 2 is an integrated sealed structure.

[0018] Through the welding of the hexagonal housing 1 and the wire harness mechanism 3, and the welding of the induction core 2 and the hexagonal housing 1, this installation method can be quickly and flexibly combined to meet the needs of multi-variety and small-batch production.

[0019] The induction core 2 includes an induction element 21, a sealing seat 22, a sealing member, an electrode support 24, and an electrode 25. The sealing seat 22 is cylindrical, and the sealing member and the electrode support 24 are both integrally encapsulated in the sealing seat 22. The electrode 25 is in contact with the induction element 21, and the induction element 21 passes through the sealing member.

[0020] By integrally sealing one end of the induction element 21, the sealing member, the electrode support 24, and one end of the electrode 25, the induction element 21 is isolated and sealed from the exhaust gas, and the functional signal circuits are led out.

[0021] The sealing member includes sealing powder 23, an insulating ring 26, and a washer 27. The insulating ring 26 and the washer 27 are respectively attached to the openings at the front and rear ends of the sealing seat 22, and the sealing powder 23 is located between the insulating ring 26 and the electrode support 24.

[0022] The electrode 25 is a round wire. The round wire of the electrode 25 replaces the existing flat wire, which not only improves the elastic deformation strength and enhances the reliability of the contact point, but also greatly reduces the width of the connecting electrode, meeting the application trend of narrower miniaturized induction elements.

[0023] The hexagonal housing 1 includes a probe sleeve 11 and a hexagonal base 12. The probe sleeve 11 is connected to the front end of the hexagonal base 12, and the hexagonal base 12 is welded and connected to the sealing seat 22.

[0024] The wire harness mechanism 3 includes a main sleeve 31, a lead joint 32, a high-temperature wire 33, and a connector 34. The main sleeve 31 is welded and connected to the hexagonal base 12. The electrode 25 is connected to one end of the high-temperature wire 33 through the lead joint 32, and the other end of the high-temperature wire 33 is connected to the connector 34.

[0025] A sealing plug 35 is provided between the lead joint 32 and the high-temperature wire 33.

[0026] The high-temperature wire 33 is wrapped with a silica gel sleeve 36.

[0027] The welding method between the hexagonal housing 1 and the wire harness mechanism 3 is laser welding or argon arc welding or plasma welding, and the welding method between the induction core 2 and the hexagonal housing 1 is laser welding or argon arc welding or plasma welding.

Claims

1. A modular compact oxygen sensor, characterized in that, It includes a hexagonal housing (1), an induction core (2), and a wire harness mechanism (3). The hexagonal housing (1) is welded to the wire harness mechanism (3). The induction core (2) is installed inside the hexagonal housing (1) and the wire harness mechanism (3). The induction core (2) is welded to the hexagonal housing (1), and the induction core (2) is an integrated sealed structure.

2. The modular compact oxygen sensor according to claim 1, characterized in that, The induction core (2) includes an induction element (21), a sealing seat (22), a seal, an electrode support (24), and an electrode (25). The sealing seat (22) is cylindrical. The seal and the electrode support (24) are both integrally encapsulated inside the sealing seat (22). The electrode (25) is in contact with the induction element (21), and the induction element (21) passes through the seal.

3. The modular compact oxygen sensor according to claim 2, characterized in that, The seal includes sealing powder (23), an insulating ring (26), and a washer (27). The insulating ring (26) and the washer (27) are respectively attached to the openings at the front and rear ends of the sealing seat (22). The sealing powder (23) is located between the insulating ring (26) and the electrode support (24).

4. The modular compact oxygen sensor according to claim 2, characterized in that, The electrode (25) is a round wire.

5. The modular compact oxygen sensor according to claim 2, characterized in that, The hexagonal housing (1) includes a probe sleeve (11) and a hexagonal base (12). The probe sleeve (11) is connected to the front end of the hexagonal base (12). The hexagonal base (12) is welded to the sealing seat (22).

6. The modular compact oxygen sensor according to claim 5, characterized in that, The wire harness mechanism (3) includes a main sleeve (31), a lead joint (32), a high-temperature wire (33), and a connector (34). The main sleeve (31) is welded to the hexagonal base (12). The electrode (25) is connected to one end of the high-temperature wire (33) through the lead joint (32), and the other end of the high-temperature wire (33) is connected to the connector (34).

7. The modular compact oxygen sensor according to claim 6, characterized in that, A sealing plug (35) is provided between the lead joint (32) and the high-temperature wire (33).

8. The modular compact oxygen sensor according to claim 6, characterized in that, The high-temperature wire (33) is wrapped with a silicone sleeve (36).

9. The modular compact oxygen sensor according to claim 1, characterized in that, The welding method between the hexagonal housing (1) and the wire harness mechanism (3) is laser welding, argon arc welding, or plasma welding. The welding method between the induction core (2) and the hexagonal housing (1) is laser welding, argon arc welding, or plasma welding.

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