Reliable oxygen sensor packaging structure

Abstract

The utility model discloses a reliable oxygen sensor packaging structure, which belongs to the technical field of oxygen sensor packaging and comprises a stainless steel shell, an upper cap is welded at one end of the stainless steel shell, a base is welded at the other end of the stainless steel shell, a heating wire is welded and fixed on one side of the base, a core part is arranged in the heating wire, and the core part is connected with the upper cap. A plurality of mounting holes are formed in one side of the base, PINs are arranged in the mounting holes, a ventilation mechanism facilitating gas transmission is arranged on the upper cap, gas transmission is facilitated through the ventilation mechanism, impurities and the like are effectively prevented from entering the sensor, and the poisoning phenomenon of a core body of the oxygen sensor is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of oxygen sensor packaging, and specifically to a reliable oxygen sensor packaging structure. Background Art

[0002] Zirconia is a typical ionic crystal. Adding divalent or trivalent cubic symmetric oxides, such as Y2O3, can make zirconia a fast ion conductor of oxygen, so zirconia is called a solid electrolyte. However, this property requires zirconia to be heated to 650°C to electrolyze and produce mobile oxygen ions. Therefore, zirconia, as the core functional material of oxygen sensing, must be provided with a high temperature environment. At present, oxygen sensors based on the principle of oxygen partial pressure mainly heat their cores by externally winding heating wires.

[0003] Chinese patent: CN214749944U, which discloses a new type of zirconia oxygen partial pressure measuring device. The proposed oxygen partial pressure sensor uses a heating wire wrapped around the outside of the core to provide a heat source for the core. The heating wire is not protected to a certain extent, making it very easy to be corroded and rusted in a corrosive gas or high temperature and high humidity environment, affecting the heating efficiency and reducing the service life, thereby affecting the measurement accuracy and data reliability of the oxygen sensor.

[0004] Based on this, a reliable oxygen sensor packaging structure is now provided, which can eliminate the disadvantages of the existing devices. Utility Model Content

[0005] The purpose of the utility model is to provide a reliable oxygen sensor packaging structure to solve the problems in the background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A reliable oxygen sensor packaging structure comprises a stainless steel shell, an upper cap is welded at one end of the stainless steel shell, a base is welded at the other end of the stainless steel shell, a heating wire is welded and fixed on one side of the base, a core component is arranged inside the heating wire, a plurality of mounting holes are arranged on one side of the base, PIN needles are arranged in each of the plurality of mounting holes, and a venting mechanism for facilitating gas transmission is arranged on the upper cap.

[0008] On the basis of the above technical solutions, the present invention also provides the following optional technical solutions:

[0009] In an optional scheme: the core component includes a second platinum ring, and the first zirconia-based solid electrolyte and the second zirconia-based solid electrolyte are respectively closely attached to both sides of the second platinum ring, the first zirconia-based solid electrolyte is closely attached to the other side of the first platinum ring, and the second zirconia-based solid electrolyte is closely attached to the other side of the third platinum ring.

[0010] In an optional solution: the ventilation mechanism includes air intake mesh holes, and a plurality of the air intake mesh holes are arranged at positions corresponding to the neck positions of the upper cap, and the air intake mesh holes are all arranged in a stainless steel filter structure.

[0011] In an optional solution: the upper end of the upper cap is arranged in a circular arc shape.

[0012] In an optional solution: the entire stainless steel shell is made of 304 stainless steel.

[0013] In an optional solution: the heating wire is made of iron-chromium-aluminum, has a wire diameter of 0.3-0.5 mm, and is spiral in shape.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] The utility model effectively protects the core components and the heating wire from poisoning by arranging a plurality of air intake mesh holes, and has a simple process, and batch production ensures high-efficiency implementation. The upper end of the upper cap is arranged in an arc shape to reduce the corrosion damage of the liquid to the sensor. The stainless steel shell is made of stainless steel as a whole to ensure uniform heat dissipation of the sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model.

[0017] Figure 2 It is a schematic diagram of the exploded core components of the utility model.

[0018] Notes on figure numbers: 1. upper cap, 2. air inlet mesh, 3. stainless steel shell, 4. core component, 5. heating wire, 6. base, 7. first platinum ring, 8. first zirconia-based solid electrolyte, 9. second platinum ring, 10. second zirconia-based solid electrolyte, 11. third platinum ring. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0020] In one embodiment, Figure 1-Figure 2As shown, a reliable oxygen sensor packaging structure comprises a stainless steel shell 3, an upper cap 1 is welded at one end of the stainless steel shell 3, a base 6 is welded at the other end of the stainless steel shell 3, a heating wire 5 is welded and fixed at one side of the base 6, a core component 4 is arranged inside the heating wire 5, a plurality of mounting holes are arranged at one side of the base 6, and PIN needles are arranged in the plurality of mounting holes, a venting mechanism for facilitating gas transmission is arranged on the upper cap 1, and while the venting mechanism facilitates gas transmission, impurities etc. are effectively slowed down from entering the sensor, thereby reducing the poisoning phenomenon of the oxygen sensor core;

[0021] The core component 4 includes a second platinum ring 9, and the first zirconia-based solid electrolyte 8 and the second zirconia-based solid electrolyte 10 are respectively closely attached to the two sides of the second platinum ring 9, the first zirconia-based solid electrolyte 8 is closely attached to the other side of the first platinum ring 7, and the second zirconia-based solid electrolyte 10 is closely attached to the other side of the third platinum ring 11. When in use, the first platinum ring 7 and the third platinum ring 11 are respectively connected to the pump end and the sensing end corresponding to the PIN needle on one side of the base 6, and the second platinum ring 9 is connected to the common end, so as to realize the measurement of oxygen partial pressure.

[0022] The ventilation mechanism includes an air intake mesh 2, and a plurality of the air intake meshes 2 are arranged at positions corresponding to the neck position of the upper cap 1. The air intake meshes 2 are all arranged in a stainless steel filter structure. When in use, they effectively slow down the entry of impurities into the stainless steel shell 3 without affecting gas transmission, thereby reducing the poisoning of the core component 4.

[0023] The upper end of the upper cap 1 is arranged in an arc shape, so that when in use, the condensed water has good fluidity when falling to the upper end of the upper cap 1, thereby reducing the corrosion damage of the liquid to the sensor.

[0024] The stainless steel housing 3 is made of 304 stainless steel as a whole, and has good thermal conductivity when in use, ensuring uniform heat dissipation of the sensor.

[0025] The heating wire 5 is made of iron-chromium-aluminum, has a wire diameter of 0.3-0.5 mm, and is spiral in shape. When in use, it is welded with a PIN needle to achieve electrical connection with the outside world.

[0026] The above embodiment discloses a reliable oxygen sensor packaging structure, wherein the first zirconium oxide-based solid electrolyte 8 after tape casting is coated with platinum slurry on the top and bottom, the first zirconium oxide-based solid electrolyte 8 and the second zirconium oxide-based solid electrolyte 10 are both tape-casted with yttrium-doped zirconium oxide powder, the doping molar percentage is 3-9%, the powder particle size is 0.1-1um, and the first platinum ring 7, the first zirconium oxide-based solid electrolyte 8, the second platinum ring 9, the second zirconium oxide-based solid electrolyte 10 and the third platinum ring 11 are placed in the order of co-firing to prepare the core component 4. The three platinum ring tails of the first platinum ring 7, the second platinum ring 9 and the third platinum ring 11 are respectively welded to the platinum wire for packaging. First, the heating wire 5 and the heating PIN of the base 6 are welded by piezoresistance welding, and then the core component 4 is placed inside the heating wire 5, and the three platinum wires on the first platinum ring 7, the second platinum ring 9 and the third platinum ring 11 are welded to the corresponding PIN needles on the base 6 by piezoresistance welding, the lower end of the stainless steel shell 3 and the base 6 are welded by laser welding, and then the lower end of the upper cap 1 and the upper end of the stainless steel shell 3 are welded by laser welding.

[0027] The above is only a specific implementation of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A reliable oxygen sensor packaging structure, comprising a stainless steel shell (3), an upper cap (1) welded to one end of the stainless steel shell (3), a base (6) welded to the other end of the stainless steel shell (3), a heating wire (5) welded and fixed to one side of the base (6), a core component (4) disposed inside the heating wire (5), characterized in that: A plurality of mounting holes are provided on one side of the base (6), and PIN needles are provided in each of the mounting holes. A venting mechanism for facilitating gas transmission is provided on the upper cap (1).

2. A reliable oxygen sensor packaging structure according to claim 1, characterized in that: The core component (4) comprises a second platinum ring (9), and a first zirconium oxide-based solid electrolyte (8) and a second zirconium oxide-based solid electrolyte (10) are respectively closely attached to the two sides of the second platinum ring (9), a first platinum ring (7) is closely attached to the other side of the first zirconium oxide-based solid electrolyte (8), and a third platinum ring (11) is closely attached to the other side of the second zirconium oxide-based solid electrolyte (10).

3. A reliable oxygen sensor packaging structure according to claim 1, characterized in that: The ventilation mechanism comprises an air intake mesh hole (2), and a plurality of the air intake mesh holes (2) are arranged at positions corresponding to the neck position of the upper cap (1), and the air intake mesh holes (2) are all arranged in a stainless steel filter mesh structure.

4. A reliable oxygen sensor packaging structure according to claim 1, characterized in that: The upper end of the upper cap (1) is arranged in a circular arc shape.

5. A reliable oxygen sensor packaging structure according to claim 1, characterized in that: The stainless steel housing (3) is entirely made of 304 stainless steel.

6. A reliable oxygen sensor packaging structure according to claim 1, characterized in that: The heating wire (5) is made of iron-chromium-aluminum, has a wire diameter of 0.3-0.5 mm, and is spiral in shape.

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