Gas sensor packaging structure

Abstract

The utility model relates to a gas sensor packaging structure which comprises a waste gas cover, a base, packaging ceramic, a powder pressing piece, T-shaped ceramic, an outer metal protection sleeve, an inner metal protection sleeve and a waterproof breathable film. The waste gas cover comprises an inner waste gas cover body and an outer waste gas cover body, the inner waste gas cover body is fixedly connected with the outer waste gas cover body through spot welding, and the outer waste gas cover body is fixedly connected to one end of the base through spot welding and communicates with an inner hole of the base. The packaging ceramic, the powder pressing piece and the T-shaped ceramic are sequentially installed in an inner hole of the base, the centers of the packaging ceramic, the powder pressing piece and the T-shaped ceramic are each provided with a via hole for a tablet core to penetrate through, the end of the inner metal protection sleeve is riveted to the tail of the base, the inner metal protection sleeve is sleeved with the outer metal protection sleeve, and the outer metal protection sleeve and the inner metal protection sleeve are fixed in a riveted mode. The waterproof breathable film wraps the outer wall of the inner metal protective sleeve. The utility model has the advantages that the metal protective sleeve adopts a riveting connection structure, so that the metal deformation caused by welding heat is avoided.

Description

Technical Field

[0001] This utility model relates to the field of automotive sensor technology, specifically to a gas sensor packaging structure. Background Technology

[0002] As an important component of vehicle exhaust gas inspection, gas sensors are currently mainly connected by welding. Welding generates a lot of heat, which can easily cause metal deformation. Moreover, the ceramic opening size that comes into contact with the powder during packaging is small, which is not conducive to the powder filling into the opening, thus easily causing sealing problems and resulting in poor air tightness. Utility Model Content

[0003] Therefore, the purpose of this utility model is to provide a gas sensor packaging structure to reduce metal deformation caused by welding and to further improve the sensor's waterproofness and breathability, thereby overcoming the shortcomings of the prior art.

[0004] This utility model provides a gas sensor packaging structure, including: an exhaust hood, a base, an encapsulating ceramic, a powder pressing sheet, a T-shaped ceramic, an outer metal protective sleeve, an inner metal protective sleeve, and a waterproof and breathable membrane; the exhaust hood includes an inner exhaust hood and an outer exhaust hood, the inner exhaust hood being fixedly connected to the outer exhaust hood by spot welding, wherein the spot welding positions are four spot welding holes on one end of the inner and outer exhaust hoods; the outer exhaust hood is fixedly connected to one end of the base by spot welding and communicates with the inner hole of the base; the encapsulating ceramic, the powder pressing sheet, and the T-shaped ceramic are sequentially installed in the inner hole of the base, and the encapsulating ceramic is located in... Near one end of the exhaust hood, the center of the encapsulating ceramic, the powder sheet, and the T-shaped ceramic is provided with a through hole for the core to pass through. The core passes through the encapsulating ceramic, the powder sheet, and the T-shaped ceramic in sequence and extends into the exhaust hood. The encapsulating ceramic has a protrusion at one end near the powder sheet. The end of the inner metal protective sleeve is riveted to the tail of the base. The outer metal protective sleeve is fitted onto the inner metal protective sleeve and riveted to fix it. The waterproof and breathable membrane is wrapped around the outer wall of the inner metal protective sleeve and is located between the inner and outer metal protective sleeves.

[0005] As a preferred embodiment of the present invention, multiple air inlets are evenly distributed on the cylinders of the inner and outer exhaust hoods, the air inlets on the inner exhaust hood and the air inlets on the outer exhaust hood are staggered, and air outlets are opened at the ends of both the inner and outer exhaust hoods, and the air outlets are in the same position.

[0006] As a preferred embodiment of the present invention, the inner hole of the T-shaped ceramic near the powder pressing end is a tapered hole.

[0007] As a preferred embodiment of the present invention, the end of the T-shaped ceramic away from the powder tablet is provided with a terminal mounting hole that is connected to the core through hole, and a wiring terminal is provided in the terminal mounting hole. The outer metal protective sleeve is provided with a fixing ceramic, a positioning block and a connecting wire for fixing the wiring terminal at a position close to the T-shaped ceramic.

[0008] As a preferred embodiment of the present invention, a first butterfly-shaped gasket is fitted between the shoulder at the front end of the T-shaped ceramic and the base step, and a second butterfly-shaped gasket is fitted between the shoulder at the rear end of the T-shaped ceramic and the inner metal protective sleeve, wherein the first butterfly-shaped gasket and the second butterfly-shaped gasket are elastic gaskets.

[0009] As a preferred embodiment of the present invention, an encapsulation gasket is provided between the inner metal protective sleeve and the riveted flange at the tail of the base.

[0010] As a preferred embodiment of the present invention, both the outer metal protective sleeve and the inner metal protective sleeve are provided with air holes.

[0011] As a preferred embodiment of the present invention, the vent is located at the tail end of the outer metal protective sleeve and the inner metal protective sleeve, and a rubber sealing plug is provided on the end of the outer metal protective sleeve away from the T-shaped ceramic, and the rubber sealing plug is provided with wire through holes matching the number of connecting wires.

[0012] As a preferred embodiment of the present invention, the outer wall of the base is hexagonal.

[0013] As a preferred embodiment of the present invention, the outer wall of the T-shaped ceramic is provided with a groove for marking the direction of identification.

[0014] The advantages of this utility model are:

[0015] 1. This utility model avoids metal deformation caused by welding heat by using a riveted connection structure for the metal protective sleeve; the exhaust hood and the base are spot welded instead of continuous weld, which reduces heat input and avoids deformation of the exhaust hood.

[0016] 2. The exhaust hood of this utility model adopts a double-layer exhaust hood structure with staggered ventilation holes to prevent water from entering the sensor.

[0017] 3. This utility model designs a waterproof and breathable membrane between the outer metal protective sleeve and the inner metal protective sleeve. The waterproof and breathable membrane is installed between the inner and outer metal protective sleeves and arranged along the outer circular surface of the protective sleeve, thus having a larger area and being more conducive to air exchange.

[0018] 4. The inner hole on the side of the T-shaped ceramic that contacts the powder tablet is a conical hole, so that the crushed powder tablet can fully fill the hole and achieve a seal. Attached Figure Description

[0019] Figure 1This is a schematic diagram of the overall structure of a gas sensor packaging structure according to the present invention.

[0020] Figure 2 This is an exploded view of the overall structure of a gas sensor packaging structure according to this utility model.

[0021] Figure 3 This is a cross-sectional view of the overall structure of a gas sensor packaging structure according to the present invention.

[0022] Figure 4 This is a schematic diagram showing the installation of the wiring terminals, fixing ceramic, positioning block, and connecting wires in a gas sensor packaging structure according to this utility model.

[0023] Figure 5 This is a schematic diagram of the installation of the inner and outer exhaust gas covers of a gas sensor packaging structure according to this utility model.

[0024] Figure 6 This is a cross-sectional view showing the inner and outer exhaust gas covers of a gas sensor packaging structure according to this utility model.

[0025] Figure 7 This is a schematic diagram of the outer metal protective sleeve of a gas sensor packaging structure according to the present invention.

[0026] Figure 8 This is a schematic diagram of the inner metal protective sleeve of a gas sensor packaging structure according to the present invention.

[0027] Figure 9 This is a schematic diagram of a gas sensor packaging structure of the present invention, in which a waterproof and breathable membrane is wrapped around the inner metal protective sleeve.

[0028] Figure 10 This is a schematic diagram of a T-shaped ceramic packaging structure for a gas sensor according to the present invention.

[0029] Reference numerals: 1. Exhaust hood; 101. Inner exhaust hood; 102. Outer exhaust hood; 103. Spot welding hole; 104. Air inlet; 105. Air outlet; 2. Base; 3. Encapsulating ceramic; 4. Powder pressing sheet; 5. T-shaped ceramic; 5. Conical hole; 501. Outer metal protective sleeve; 6. Inner metal protective sleeve; 7. Waterproof and breathable membrane; 8. Core sheet; 9. First butterfly gasket; 10. Second butterfly gasket; 11. Encapsulating gasket; 12. Air hole; 13. Rubber sealing plug; 14. Terminal block; 15. Detailed Implementation

[0030] This embodiment provides a gas sensor encapsulation structure, including: an exhaust hood 1, a base 2, an encapsulating ceramic 3, a powder press 4, a T-shaped ceramic 5, an outer metal protective sleeve 6, an inner metal protective sleeve 7, and a waterproof and breathable membrane 8; the exhaust hood 1 includes an inner exhaust hood 101 and an outer exhaust hood 102, the inner exhaust hood 101 being fixedly connected to the outer exhaust hood 102 by spot welding, wherein the spot welding positions are the four spot welding holes 103 on one side end of the inner exhaust hood 101 and the outer exhaust hood 102, the outer exhaust hood 102 being fixedly connected to one end of the base 2 by spot welding and communicating with the inner hole of the base; the encapsulating ceramic 3, the powder press 4, and the T-shaped ceramic 5 are installed sequentially from right to left in the inner hole of the base, with the encapsulating ceramic 3 located near the exhaust hood. At one end, the encapsulating ceramic 3, powder press 4, and T-shaped ceramic 5 each have a through hole for the core 9 to pass through. The core 9 passes through the encapsulating ceramic 3, powder press 4, and T-shaped ceramic 5 in sequence and extends into the exhaust hood 1. The encapsulating ceramic 3 has a protrusion at the end near the powder press 4. This protrusion serves as a powder breaking structure. When the protrusion of the encapsulating ceramic 3 applies axial pressure during the installation of the gas sensor, it fully breaks the powder press 4 and recompacts the broken powder to fix the ceramic core. At the same time, the broken powder can fill the gaps. Since the compacted powder has a high density, it can play a sealing role. The sealing performance can also be further improved by high-temperature sintering. The gas leakage rate is ≤0.2ml / min. The end of the inner metal protective sleeve 7 is riveted to the tail of the base 2. The outer metal protective sleeve 6 is fitted onto the inner metal protective sleeve 7 and riveted to it. A waterproof and breathable membrane 8 is wrapped around the outer wall of the inner metal protective sleeve 7 and located between the inner metal protective sleeve 7 and the outer metal protective sleeve 6. Multiple air inlets 104 are evenly distributed on the cylinders of the inner exhaust hood 101 and the outer exhaust hood 102. The air inlets 104 on the inner exhaust hood 7 and the outer exhaust hood 6 are staggered. This staggered arrangement effectively prevents water from entering. Air outlets 105 are provided at the ends of both the inner exhaust hood 101 and the outer exhaust hood 102. The air outlets 105 are in the same position and overlap to ensure proper airflow. The outer wall of the base 2 is hexagonal, and the outer wall of the T-shaped ceramic has grooves for directional marking.

[0031] Furthermore, in this embodiment, the end of the T-shaped ceramic 5 contacts the powder. In order to fully fill the gap between the ceramic core 9 and the T-shaped ceramic 5, the inner hole of the T-shaped ceramic 5 near the powder pressing 4 is a tapered hole 501, which facilitates the powder to fill into the hole and improves the sealing performance.

[0032] Furthermore, in this embodiment, the end of the T-shaped ceramic away from the powder tablet is provided with a terminal mounting hole that is connected to the core through hole. A wiring terminal 15 is provided in the terminal mounting hole. A fixing ceramic, a positioning block and a connecting wire are provided in the outer metal protective sleeve 6 near the T-shaped ceramic 5 to fix the wiring terminal 15 so as to meet the signal transmission.

[0033] Furthermore, in this embodiment, a first butterfly-shaped gasket 10 is installed between the shoulder at the front end of the T-shaped ceramic 5 and the step of the base 2, and a second butterfly-shaped gasket 11 is installed between the shoulder at the rear end of the T-shaped ceramic 5 and the inner metal protective sleeve 7. The first butterfly-shaped gasket 10 and the second butterfly-shaped gasket 11 are elastic gaskets. The first butterfly-shaped gasket 10 avoids collision with the base 2 and damage when axial force is applied to the T-shaped ceramic 5, thus playing a buffering role. One side of the second butterfly-shaped gasket 11 contacts the T-shaped ceramic 5, and the other side contacts the inner metal protective sleeve 7 to play a buffering role. An encapsulation gasket 12 is provided between the inner metal protective sleeve 7 and the riveted flange at the tail end of the base 2. The encapsulation gasket 12 is wrapped and the inner metal protective sleeve 7 is fixed by riveting the base flange.

[0034] Furthermore, in this embodiment, both the outer metal protective sleeve 6 and the inner metal protective sleeve 7 are provided with vents 13. The vents 13 are located at the tail ends of the outer metal protective sleeve 6 and the inner metal protective sleeve 7. A rubber sealing plug 14 is provided at the end of the outer metal protective sleeve 6 away from the T-shaped ceramic 5, and the rubber sealing plug 14 has wire through holes matching the number of connecting wires.

Claims

1. A gas sensor packaging structure, characterized in that, include: The system comprises an exhaust hood, a base, encapsulating ceramic, powder sheet, T-shaped ceramic, an outer metal protective sleeve, an inner metal protective sleeve, and a waterproof and breathable membrane. The exhaust hood includes an inner exhaust hood and an outer exhaust hood. The inner exhaust hood is spot-welded to the outer exhaust hood, and the outer exhaust hood is spot-welded to one end of the base and communicates with the inner hole of the base. The encapsulating ceramic, powder sheet, and T-shaped ceramic are sequentially installed within the inner hole of the base, with the encapsulating ceramic located at the end closest to the exhaust hood. Each part has a through hole in the center for the core to pass through. The core passes through the encapsulation ceramic, the powder tablet, and the T-shaped ceramic in sequence and extends into the exhaust hood. The encapsulation ceramic has a protrusion at one end near the powder tablet. The end of the inner metal protective sleeve is riveted to the tail of the base. The outer metal protective sleeve is fitted onto the inner metal protective sleeve and riveted to fix it. The waterproof and breathable membrane is wrapped around the outer wall of the inner metal protective sleeve and is located between the inner and outer metal protective sleeves.

2. The gas sensor packaging structure according to claim 1, characterized in that, The inner and outer exhaust hoods are provided with multiple air inlets evenly distributed on their cylindrical surfaces. The air inlets on the inner and outer exhaust hoods are staggered. Both the inner and outer exhaust hoods have exhaust outlets at their ends, and the exhaust outlets are located in the same positions.

3. The gas sensor packaging structure according to claim 1, characterized in that, The inner hole of the T-shaped ceramic near the powder pressing end is a tapered hole.

4. The gas sensor packaging structure according to claim 1, characterized in that, The T-shaped ceramic is provided with a terminal mounting hole connected to the core through hole at the end away from the powder tablet. A wiring terminal is provided in the terminal mounting hole. A fixing ceramic, a positioning block and a connecting wire are provided in the outer metal protective sleeve near the T-shaped ceramic for fixing the wiring terminal.

5. The gas sensor packaging structure according to claim 1, characterized in that, A first butterfly-shaped gasket is fitted between the shoulder at the front end of the T-shaped ceramic and the base step, and a second butterfly-shaped gasket is fitted between the shoulder at the rear end of the T-shaped ceramic and the inner metal protective sleeve. The first and second butterfly-shaped gaskets are elastic gaskets.

6. The gas sensor packaging structure according to claim 1, characterized in that, An encapsulation gasket is provided between the inner metal protective sleeve and the riveted flange at the tail of the base.

7. The gas sensor packaging structure according to claim 1, characterized in that, Both the outer and inner metal protective sleeves are provided with air holes.

8. The gas sensor packaging structure according to claim 7, characterized in that, The vent is located at the tail end of the outer metal protective sleeve and the inner metal protective sleeve. A rubber sealing plug is provided on the end of the outer metal protective sleeve away from the T-shaped ceramic. The rubber sealing plug is provided with wire through holes matching the number of connecting wires.

9. A gas sensor packaging structure according to claim 1, characterized in that, The outer wall of the base is hexagonal.

10. A gas sensor packaging structure according to claim 1, characterized in that, The outer wall of the T-shaped ceramic is provided with grooves for marking the direction of identification.

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