Oxygen sensor with chip protection structure

Abstract

The utility model discloses an oxygen sensor with a chip protection structure, and relates to the technical field of oxygen sensors, the oxygen sensor with the chip protection structure comprises a short oxygen part at the front section and a wiring harness assembly at the rear section; the short oxygen part comprises a base, a chip is fixedly connected in the base, a protective cover for protecting the chip is arranged at the end part of the base, and the protective cover is sleeved at one end of the chip; a large porcelain piece is arranged at one end, far away from the protective cover, of the chip, a small porcelain piece and a pressed powder are further arranged on the outer side of the chip, and the pressed powder is located between the small porcelain piece and the large porcelain piece; according to the utility model, the shield is fixed on the base by means of laser welding, the shield is mainly used for protecting the chip, and in addition, the shield adopts a double-layer porous design, so that not only can the chip be protected, but also condensate water or dust in the shield can be discharged in time, thereby prolonging the service life of the chip.

Description

Technical Field

[0001] The utility model specifically relates to the technical field of oxygen sensors, in particular to an oxygen sensor with a chip protection structure. Background Art

[0002] An oxygen sensor is a device used to measure the oxygen content in exhaust gas. It plays a key role in many fields, including automobiles and industrial combustion equipment. Its main operating principle is based on electrochemistry, and it determines the oxygen concentration by detecting the partial pressure of oxygen in the exhaust gas.

[0003] However, in practice, people have noticed that the chip of the oxygen sensor is generally installed in the front part and is in direct contact with the vehicle exhaust. The high temperature of the vehicle exhaust and the cold air outside will cause condensation on the surface of the sensor. The condensation water will be in contact with the sensor for a long time and easily penetrate into the sensor through the gap, causing damage to the sensor. In addition, the condensation water can easily be contaminated by dust and cover the surface of the chip, affecting the detection accuracy of the chip. Utility Model Content

[0004] The purpose of this utility model is to provide an oxygen sensor with a chip protection structure. This structure is protected by a shield positioned at the end of the chip. The shield's double-layer, multi-porous design not only provides protection but also drains away condensed water and dust, thereby extending the chip's service life. This is to address the technical problems identified in the aforementioned background art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] An oxygen sensor with a chip protection structure includes a short oxygen portion at the front section and a wiring harness assembly at the rear section;

[0007] The short oxygen part comprises a base, in which a chip is fixedly connected, and an end of the base is provided with a shield for protecting the chip, which is sleeved on one end of the chip.

[0008] As a further technical solution of the present invention, a large porcelain piece is provided at one end of the chip away from the shield, and a small porcelain piece and a powder cake are provided on the outside of the chip, wherein the powder cake is located between the small porcelain piece and the large porcelain piece.

[0009] As a further technical solution of the present invention, the small porcelain piece and powder are respectively pressed together and connected to the base in a powder filling manner. The base is curled at one end away from the shield, and the end of the large porcelain piece is fixedly installed inside the curl.

[0010] As a further technical solution of the present invention, the ends of the chip respectively penetrate the small porcelain piece, the powder cake and the large porcelain piece and are placed in the cavity of the base, and the chip is fixed in the base by pressing, that is, fixed by crushing the powder cake and filling it.

[0011] As a further technical solution of the present invention, the protective shield is provided with an inner and outer layer, and both the inner and outer layers of the protective shield are provided with holes in a circular array, which protects the end of the chip without affecting the detection accuracy of the chip, and the end of the protective shield is welded to the base.

[0012] As a further technical solution of the present invention, the wiring harness assembly includes a fixed porcelain body, a wire and a terminal, wherein the terminal is press-fitted with the end of the wire and the terminal is inserted into the large porcelain piece and contacts the end of the chip.

[0013] As a further technical solution of the present invention, a small fluororubber plug and a large fluororubber plug are sleeved on the outside of the wire, and the small fluororubber plug is located between the fixed porcelain body and the large fluororubber plug, and a rear sleeve is further provided on the outside of the small fluororubber plug and the large fluororubber plug;

[0014] One end of the rear sleeve is connected and fixed to the large fluororubber plug by riveting.

[0015] As a further technical solution of the present invention, an outer sleeve is sleeved on the outer side of the connection between the large porcelain piece and the fixed porcelain body, and the two ends of the outer sleeve are fixedly connected to the base and the rear sleeve respectively, wherein the end of the outer sleeve is inserted into the inner side of the rear sleeve, and a semipermeable membrane is provided between the connection between the outer sleeve and the rear sleeve.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] The utility model fixes the protective cover on the base by laser welding, and its main function is to protect the chip. In addition, the protective cover adopts a double-layer porous design, which not only protects the chip, but also can timely discharge the condensed water or dust inside it, thereby extending the service life of the chip; the utility model fixes the chip in the base by pressing, that is, the chip is fixed by crushing the powder cake to fill it in the connection, and then the chip is completely fixed in the base by pressing the base curling. At this time, the powder cake plays a sealing role, thereby ensuring the sealing of the short oxygen part connection; the utility model, before the rear sleeve and the outer sleeve are connected, a semipermeable membrane needs to be put on the inner side of the rear sleeve. The function of the semipermeable membrane is waterproof and breathable, so that external water cannot enter the product, but the exhaust gas inside the product can be discharged to the outside through the semipermeable membrane, and then combined with a large fluororubber plug, the waterproof effect of the connection is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1It is a structural schematic diagram of the utility model in use state.

[0019] Figure 2 It is a structural schematic diagram of the wiring harness assembly in the utility model.

[0020] Figure 3 This utility model Figure 1 Schematic diagram of part of the structure.

[0021] Figure 4 This utility model Figure 3 Schematic diagram of the internal structure.

[0022] Figure 5 It is a cross-sectional view of the short oxygen part of the utility model.

[0023] Figure 6 It is a structural diagram of the protective cover in the utility model.

[0024] Figure 7 This utility model Figure 6 sectional view of .

[0025] In the picture:

[0026] Chip-1, protective cover-2, base-3, small ceramic part-4, powder cake-5, large ceramic part-6, fixed ceramic body-7, semi-permeable membrane-8, small fluororubber plug-9, large fluororubber plug-10, rear sleeve-11, wire-12, terminal-13, outer sleeve-14, wiring harness connector-15. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] See also Figure 1-7 , an embodiment of the utility model provides an oxygen sensor with a chip protection structure, comprising a short oxygen portion of a front section and a wiring harness assembly of a rear section;

[0029] The short oxygen part includes a base 3 , in which a chip 1 is fixedly connected. An end of the base 3 is provided with a shield 2 for protecting the chip 1 , and the shield 2 is sleeved on one end of the chip 1 .

[0030] In this embodiment, a large ceramic piece 6 is provided at one end of the chip 1 away from the shield 2 , and a small ceramic piece 4 and a powder cake 5 are further provided on the outside of the chip 1 , wherein the powder cake 5 is located between the small ceramic piece 4 and the large ceramic piece 6 .

[0031] In this embodiment, the small porcelain piece 4 and the powder cake 5 are connected to the base 3 by pressing in a powder cake filling manner, and the end of the large porcelain piece 6 is fixedly connected to the end of the base 3 away from the shield 2.

[0032] In this embodiment, the ends of the chip 1 respectively pass through the small porcelain piece 4, the powder cake 5 and the large porcelain piece 6 and are placed in the cavity of the base 3, and the chip 1 is fixed in the base 3 by pressing, that is, fixed by crushing the powder cake and filling it.

[0033] In this embodiment, the protective cover 2 has two layers, an inner layer and an outer layer. Both the inner layer and the outer layer of the protective cover 2 have holes in a circular array, which protects the end of the chip 1 without affecting the detection accuracy of the chip. The end of the protective cover 2 is welded to the base 3.

[0034] In this embodiment, the wiring harness assembly includes a fixed ceramic body 7, a wire 12 and a terminal 13, wherein the terminal 13 is press-fitted with the end of the wire 12, and the terminal 13 is inserted into the large ceramic piece 6 and contacts the end of the chip 1;

[0035] The terminal 13 is an integrated resilient arrangement, and is fitted with and fixed to the large porcelain piece 6 by an interference fit.

[0036] In this embodiment, a small fluororubber plug 9 and a large fluororubber plug 10 are sleeved on the outside of the wire 12, and the small fluororubber plug 9 is located between the fixed porcelain body 7 and the large fluororubber plug 10. A rear sleeve 11 is also provided on the outside of the small fluororubber plug 9 and the large fluororubber plug 10.

[0037] One end of the rear sleeve 11 is fixed to the large fluororubber plug 10 by riveting.

[0038] In this embodiment, an outer sleeve 14 is sleeved on the outer side of the connection between the large porcelain piece 6 and the fixed porcelain body 7, and the two ends of the outer sleeve 14 are fixedly connected to the large porcelain piece 6 and the rear sleeve 11 respectively, wherein the end of the outer sleeve 14 is inserted into the inner side of the rear sleeve 1, and a semipermeable membrane 8 is provided between the connection between the outer sleeve 14 and the rear sleeve 11.

[0039] By adopting the above technical solution, the end of the chip 1 is first passed through the small porcelain piece 4, the powder cake 5 and the large porcelain piece 6 in turn, and then the chip 1 is placed in the cavity of the base 3. At this time, the small porcelain piece 4 and the powder cake 5 are respectively located on the inner side of the base 3, and then the chip 1 is fixed in the base 3 by pressing, that is, the chip 1 is fixed by crushing the powder cake 5 so that it fills the connection, and then the chip is completely fixed in the base by pressing the curling edge of the base 3. At this time, the powder cake 5 plays a sealing role; then the protective cover 2 is fixed to the base 3 by laser welding. Its main function is to protect the chip 1. In addition, the protective cover 2 adopts a double-layer porous design, which not only protects the chip 1, but also can discharge the condensed water or dust inside it in time.

[0040] In this embodiment, one end of the wire 12 away from the large fluororubber plug 10 is fixedly connected to a wiring harness connector 15 , and a flexible protective sheath is wrapped around the outside of the wire 12 between the wiring harness connector 15 and the large fluororubber plug 10 .

[0041] In this embodiment, the connection between the rear sleeve 11 and the large fluororubber plug 10 is interference fit by pressing, and the contact position between the terminal 13 and the chip 1 is sealed by the large fluororubber plug 10 and the small fluororubber plug 9, thereby achieving a waterproof effect.

[0042] In this embodiment, one end of the outer sleeve 14 is fixedly connected to the rear sleeve 11 by riveting, and the other end is fixedly connected to the large porcelain part 6 by welding, connecting the short oxygen part and the wiring harness assembly together, and the outer sleeve 14 and the rear sleeve 11 cooperate with each other to prevent bending damage at the connection.

[0043] The working principle of the utility model is as follows: when in use, first, the end of the chip 1 is passed through the small porcelain piece 4, the powder cake 5 and the large porcelain piece 6 in sequence, and then the chip 1 is placed in the cavity of the base 3. At this time, the small porcelain piece 4 and the powder cake 5 are respectively located on the inner side of the base 3. Then, the chip 1 is fixed in the base 3 by pressing, that is, the chip 1 is fixed by crushing the powder cake 5 so that it fills the connection. Then, the chip is completely fixed in the base by pressing and crimping the base 3. Then, the shield 2 is fixed to the base 3 by laser welding. At this time, the installation of the short oxygen part is completed.

[0044] Then install the wiring harness assembly. The terminal 13 is press-fitted and connected to the end of the wire 12. The wire 12 passes through the fixed porcelain body 7 and is clamped on the fixed porcelain body 7 through the undercut of the terminal 13. The wiring harness 12 then passes through the small fluororubber plug 9 and the large fluororubber plug 10, and then put on the outer sleeve 14 and the rear sleeve 11 (the rear sleeve 11 needs to be covered with a semi-permeable membrane 8. The function of the semi-permeable membrane 8 is to waterproof and ventilate the product so that water from the outside cannot enter the product, but the exhaust gas inside the product can be discharged to the outside through the semi-permeable membrane 8).

[0045] Finally, the short oxygen part and the wiring harness assembly are assembled, the outer sleeve 14 is fixed to the base 3 by laser welding, and the rear sleeve 11 is then completely riveted together by riveting the rear sleeve 11 and the outer sleeve 14 as well as the rear sleeve 11 and the large fluororubber plug 10. From then on, the wiring harness part and the short oxygen part are completely fixed and connected.

[0046] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0047] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. An oxygen sensor with a chip protection structure, characterized in that: Including the short oxygen part of the front section and the wiring harness assembly of the rear section; The short oxygen part comprises a base (3), a chip (1) is fixedly connected to the base (3), and a shield (2) for protecting the chip (1) is provided at the end of the base (3), and the shield (2) is sleeved on one end of the chip (1).

2. The oxygen sensor with a chip protection structure according to claim 1, characterized in that: A large porcelain piece (6) is provided at one end of the chip (1) away from the shield (2), and a small porcelain piece (4) and a powder cake (5) are also provided on the outside of the chip (1), wherein the powder cake (5) is located between the small porcelain piece (4) and the large porcelain piece (6).

3. The oxygen sensor with a chip protection structure according to claim 2, characterized in that: The small porcelain piece (4) and the powder cake (5) are respectively pressed and connected to the base (3) in a powder cake filling manner. The base (3) is provided with a curling edge at one end away from the shield (2), and the end of the large porcelain piece (6) is located inside the curling edge and fixedly installed.

4. The oxygen sensor with a chip protection structure according to claim 3, characterized in that: The ends of the chip (1) respectively penetrate the small porcelain piece (4), the powder cake (5) and the large porcelain piece (6) and are placed in the cavity of the base (3), and the chip (1) is fixed in the base (3) by pressing, that is, by crushing the powder cake and filling it.

5. The oxygen sensor with a chip protection structure according to claim 1, characterized in that: The shield (2) is provided with an inner and outer layer. Holes are provided in a circular array on the inner and outer layers of the shield (2), which protect the end of the chip (1) without affecting the detection accuracy of the chip. The end of the shield (2) is welded to the base (3).

6. The oxygen sensor with a chip protection structure according to claim 1, characterized in that: The wiring harness assembly comprises a fixed porcelain body (7), a wire (12) and a terminal (13), wherein the terminal (13) is press-fitted with the end of the wire (12), and the terminal (13) is inserted into the large porcelain piece (6) and contacts the end of the chip (1); The terminal (13) is an integrated resilient arrangement, and is fitted with the large porcelain piece (6) in an interference fit manner and fixed therein.

7. The oxygen sensor with a chip protection structure according to claim 6, characterized in that: The outer side of the wire (12) is also sleeved with a small fluororubber plug (9) and a large fluororubber plug (10), and the small fluororubber plug (9) is located between the fixed porcelain body (7) and the large fluororubber plug (10), and the outer sides of the small fluororubber plug (9) and the large fluororubber plug (10) are also provided with a rear sleeve (11); One end of the rear sleeve (11) is connected and fixed to the large fluororubber plug (10) by riveting.

8. The oxygen sensor with a chip protection structure according to claim 7, characterized in that: An outer sleeve (14) is sleeved on the outer side of the connection between the large porcelain piece (6) and the fixed porcelain body (7), and the two ends of the outer sleeve (14) are fixedly connected to the base (3) and the rear sleeve (11), respectively, wherein the end of the outer sleeve (14) is inserted into the inner side of the rear sleeve (11), and a semi-permeable membrane (8) is provided between the connection between the outer sleeve (14) and the rear sleeve (11).

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