Protective shell for electronic component of gas sensor

Abstract

The utility model provides a gas sensor electronic component protection housing, comprising a protection housing 1, the protection housing 1 is provided with a waterproof breathable film and a vent hole, the protection housing 1 is also provided with an annular sealing member, and the top end face of the annular sealing member is provided with a sealing surface. When the sealing face is attached and sealed, a closed space wrapping the waterproof breathable film and the breathable holes can be formed. When the sealing performance of the gas sensor is detected, the requirements on the area, the roughness and the flatness range of the sealing surface are more beneficial to the fitting of the sealing surface and a test sealing element, and the sealing effect is ensured. When the gas tightness of the gas sensor electronic component is detected, the sealing performance of the sealant between the protective shells of the gas sensor electronic component can be accurately detected and monitored, the utilization rate of the gas sensor is effectively increased, and the service life of the gas sensor is effectively prolonged.

Description

Technical Field

[0001] The utility model relates to a sensor, in particular to a protective housing for an electronic component of a gas sensor. Background Art

[0002] In the existing gas sensor technology, as Figure 1 shown, a protective housing I and a protective housing II of an electronic component of a gas sensor are connected by a sealant. The electronic component provided inside the housing makes the electronic component of the gas sensor in a sealed state after the sealant dries. When the gas sensor works, the temperature of the electronic component of the gas sensor gradually rises, resulting in the temperature inside the housing of the electronic component of the gas sensor being higher than the external temperature, causing the gas pressure inside the housing to be greater than the external pressure, so that the electronic component is subjected to pressure. When the gas sensor stops working, the electronic component gradually cools down to room temperature, and the internal pressure of the electronic component of the gas sensor gradually returns to the atmospheric pressure, and the pressure on the electronic component gradually disappears. When the working state of the sensor changes continuously, the internal pressure of the electronic component changes with the working state, and the electronic component is subjected to frequent pressure changes, thereby reducing the service life of the sensor; generally, a waterproof and breathable structure is provided on the outer shell of the sensor electronic component to balance the internal air pressure, and at the same time, the waterproof and breathable ability of the sensor electronic component is increased. However, due to the provision of the waterproof and breathable structure, the inside of the electronic component of the gas sensor is connected to the external atmosphere. When drying the sealant between the upper and lower housings of the electronic component of the gas sensor in the early stage, impurities may enter the sealant, reducing the sealing performance of the sealant. During the working process of the sensor, due to the reduction of the sealing performance of the sealant, poor sealing may occur between the upper and lower housings of the electronic component of the gas sensor, allowing water vapor and impurities to enter the electronic component, causing the electronic component to be damaged and fail. Although the above gas sensor with a waterproof and breathable structure plays a role in balancing the internal and external air pressures and enhancing the waterproof and breathable ability, the technical problem of detecting and monitoring the sealing performance of the sealant between the protective housings of the gas sensor electronic component has not been solved. Therefore, a protective housing for an electronic component of a gas sensor is needed.

[0003] Through retrieval, there are similar protective casings for gas sensor electronic components in the prior art. For example, the utility model with the publication number "CN219122168U" and the name "A pressure-balanced nitrogen-oxygen sensor with a breathable membrane" discloses a pressure-balanced gas sensor with a breathable membrane, including a housing and a cover body hermetically connected to the housing. The cover body is provided with a mounting hole, in which a waterproof breathable membrane and a protective cover are arranged. The waterproof breathable membrane is located inside the protective cover, and the protective cover is provided with air-permeable holes. Another example is the invention with the publication number "CN110658302A" and the name "Nitrogen-oxygen sensor and housing with a waterproof breathable structure". This invention patent discloses a nitrogen-oxygen sensor, including an upper housing, a lower housing, a waterproof breathable membrane and a circuit board. The upper housing and the lower housing are assembled together. A receiving space is formed between the lower housing and the upper housing. The upper housing is provided with a main groove with an opening facing the receiving space, a secondary groove with an opening facing the outside and located around the main groove, and a cover plate located above the main groove and covering the main groove. At least part of the outer side of the main groove and the inner side of the secondary groove are located on the same plane so that the main groove and the secondary groove communicate with each other at their sides. The waterproof breathable membrane is fixed around the opening of the main groove on the side of the receiving space to cover the opening of the main groove on the side of the receiving space, and the circuit board is placed in the receiving space. The housing with a waterproof breathable structure provided by the above invention can provide mechanical protection for the waterproof breathable membrane. Although the gas sensors in the above two comparative documents both involve an electronic component housing with a waterproof breathable structure, due to the waterproof breathable structure provided on the housing, the interior of the gas sensor electronic component is connected to the external atmosphere. When drying the sealant between the protective casings of the gas sensor electronic component in the early stage, impurities may enter the sealant, reducing the sealing performance of the dried sealant, resulting in incomplete sealing between the upper and lower housings of the gas sensor electronic component, allowing water vapor and impurities to enter the interior of the sensor electronic component housing through the incompletely sealed parts, thereby causing damage and failure of the electronic component. Summary of the Utility Model

[0004] The object of the present utility model is to overcome the above-mentioned defects or problems in the background art and provide a protective casing for gas sensor electronic components that can still detect and monitor the sealing performance of the sealant between the protective casings of the gas sensor electronic components after installing the waterproof breathable structure.

[0005] To achieve the above object, a protective casing for gas sensor electronic components includes a first protective casing. The first protective casing is provided with a waterproof breathable membrane and air-permeable holes. The first protective casing also has an annular seal. The top end face of the annular seal has a sealing surface. When the sealing surface is hermetically bonded, a closed space can be formed to enclose the waterproof breathable membrane and the air-permeable holes.

[0006] Furthermore, the area of the sealing surface is greater than 25 mm².

[0007] Further, the surface roughness of the sealing surface is less than 1.6 μm.

[0008] Further, the flatness of the sealing surface is less than 0.05 mm.

[0009] Further, the annular seal is higher than the upper surface of the protective housing, and the part of the annular seal protruding from the outer surface of the protective housing forms an upper protruding portion; when performing a sealing test on the gas sensor, the upper protruding portion of the annular seal is in close contact with the external test seal.

[0010] Further, a groove is provided on the sealing surface, and the groove surrounds the sealing surface in a ring shape.

[0011] Further, the test seal has a flange that mates with the groove, the groove is adapted to the flange of the test seal, and the depth of the groove is less than the height of the flange of the test seal.

[0012] Further, a threaded portion is provided on the inner wall of the upper protruding portion of the annular seal. The test seal includes an O-ring seal washer and a pin-shaped bolt. The threaded portion is tightened with the pin-shaped bolt through the O-ring seal washer, and the thickness of the O-ring seal washer is greater than the depth of the groove and they match each other.

[0013] Further, the shape of the sealing surface is preferably circular.

[0014] Compared with the prior art, the technical solution of the present utility model has the following beneficial effects: A gas sensor electronic component protective housing involved in the present utility model is provided with an annular seal on the protective housing, and the top end face of the annular seal has a sealing surface. When the sealing surface is sealed by being attached to an external test seal, a closed space is formed. The closed space wraps the waterproof and breathable membrane and the air vent holes inside. When detecting the sealing performance of the gas sensor, the area of the sealing surface is greater than 25 mm², the surface roughness is less than 1.6 μm, and the flatness is less than 0.05 mm, which is more conducive to the attachment of the sealing surface and the test seal, ensuring the sealing effect of the gas sensor electronic component. When detecting the airtight performance of the gas sensor electronic component, it can accurately detect and monitor the sealing performance of the sealant of the gas sensor electronic component, effectively improving the utilization rate and service life of the gas sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the relative structure of the existing gas sensor housing and electronic components;

[0016] Figure 2 It is a transverse sectional view of the protective housing I of the present utility model passing through the closed space;

[0017] Figure 3 is Figure 2 an enlarged view of A in;

[0018] Figure 4 is a transverse sectional view of the upper protruding part of the annular seal in Embodiments 1-2 of the present utility model;

[0019] Figure 5 is a partially enlarged transverse sectional view when the upper protruding part of the annular seal and the test seal are sealed in Embodiment 1 of the present utility model;

[0020] Figure 6 is a partially enlarged transverse sectional view when the upper protruding part of the annular seal and the test seal are sealed in Embodiment 2 of the present utility model;

[0021] Figure 7 is a partially enlarged transverse sectional view when the upper protruding part of the annular seal and the test seal are sealed in Embodiment 3 of the present utility model;

[0022] In the figure: 1. First protection housing, 2. Second protection housing, 3. Electronic components, 4. Sealant, 5. Annular seal, 51. Sealing surface, 52. Groove, 53. Threaded part, 6. First test seal, 7. Second test seal, 8. Third test seal, 9. Sealing space, 10. Waterproof and breathable membrane, 11. Vent hole. Detailed implementation manners

[0023] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the following will combine the appended drawings of the embodiments of the present utility model Figure 1-7 to clearly and completely describe the technical solutions of the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. Based on the described embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present utility model.

[0024] It should be noted that all directional indications (such as up, down...) in the embodiments of the present utility model are only used to explain the relative positional relationship of components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0025] In addition, for the description of the shape of the present utility model, such as the shape of the sealing surface is preferably circular, and can also be square, rhombus, polygon and other irregular shapes, all of which belong to the scope of protection of the present utility model. Embodiment 1:

[0026] As Figure 2-3As shown in the figure, a protective housing for a gas sensor electronic component includes a first protective housing 1, on which a waterproof and breathable film 10 and a ventilation hole 11 are provided. It is characterized in that the first protective housing further has an annular seal 5, and the top end face of the annular seal has a sealing surface 51. When the sealing surface 51 is fitted and sealed, a closed space 9 that wraps the waterproof and breathable film 10 and the ventilation hole 11 can be formed.

[0027] In this embodiment, during the sealing test, a test seal can be used to fit the sealing surface 51 so that the waterproof and breathable film 10 and the ventilation hole 11 are wrapped in the closed space 9. At this time, theoretically, the space formed between the protective housings of the gas sensor electronic component should be airtight. When the ventilation plug of the airtightness detection instrument is inserted into the jack of the second protective housing 2 of the gas sensor 3 for ventilation, and when a certain air pressure is reached and maintained for a period of time, the air pressure value on the instrument remains basically unchanged, indicating that the sealing performance of the sealant 4 of the protective housing of the gas sensor electronic component 3 is good. Through the above method, the sealing performance of the gas sensor electronic component 3 can be detected and monitored at any time.

[0028] The first test seal is a circular sealing cover. When the circular sealing cover fits the sealing surface 51 and a certain pressure is applied to the first test seal 6, the waterproof and breathable film 10 and the ventilation hole 11 can be completely sealed.

[0029] The side provided with the waterproof and breathable film 10 is defined as the inner surface of the first protective housing 1, as Figure 4-5 As shown in the figure, the upper protruding part of the annular seal 5 protrudes on the outer surface of the first protective housing 1. When the first test seal 6 fits the annular seal 5, the first test seal can wrap the sealing surface 51 of the top end face of the annular seal 5, which is more conducive to the fitting and sealing of the edge of the first test seal 6 and the annular seal 5. At the same time, the area of the sealing surface 51 of the top end face of the annular seal 5 should be appropriately large. Then, the contact surface between the sealing surface 51 of the top end face of the annular seal and the first test seal is large, and the roughness and flatness should be appropriately small. The sealing surface 51 of the top end face of the annular seal 5 is flatter, and the degree of fitting between the sealing surface 51 of the top end face of the annular seal 5 and the surface of the first test seal is higher, which is more conducive to the fitting and sealing of the surface of the first test seal and the sealing surface 51 of the top end face of the annular seal 5. By restricting the area, flatness and roughness range of the sealing surface 51 of the annular seal 5, it is more conducive to the fitting and sealing of the surface of the first test seal and the sealing surface 51 of the top end face of the annular seal 5, effectively avoiding the influence of the waterproof and breathable film and the ventilation hole on the sealing performance detection and monitoring during the sealing detection of the protective housing of the gas sensor electronic component 3, thus facilitating the detection and monitoring of the sealing performance of the sealant 4 between the first protective housing 1 and the second protective housing 2 of the gas sensor electronic component 3. Embodiment 2:

[0030] like Figure 6 As shown, based on Example 1, a circle of grooves 52 are opened on the sealing surface 51 of the top end face of the annular seal 5. The grooves 52 are annular and surround the sealing surface 51 of the top end face of the annular seal 5 in the upper end protrusion.

[0031] The test seal 2 7 can be a rubber seal with a circle of flanges. When the test seal 2 5 is covered on the annular seal 5, a certain pressure is applied to the test seal 2 7. Because the height of the flange of the test seal 2 7 is greater than the depth of the groove 52, the flange of the test seal 2 7 undergoes elastic deformation, and the test seal 2 7 can completely seal the waterproof breathable membrane 10 and the air vent 11.

[0032] The flange of the test seal 2 7 enters into the groove 52 of the sealing surface 51 of the top end face of the annular seal 5, making it difficult for the test seal 2 7 and the annular seal 5 to slide relative to each other; since the depth of the groove 52 is less than the height of the flange of the test seal 2 7, when the sealing instrument performs airtightness testing on the electronic components of the gas sensor, the flange of the test seal 2 7 can support the bottom of the groove 52 and deform, so that the flange of the test seal 2 7 and the groove 52 of the sealing surface 51 of the top end face of the annular seal 5 can fit tightly, thereby achieving a better seal between the annular seal 5 and the test seal 2 7. Example 3:

[0033] like Figure 7 As shown, based on the embodiment 2, a threaded portion 53 is provided on the inner wall of the upper end protrusion of the annular seal 5 .

[0034] The test seal three 8 includes an O-ring and a pin-shaped bolt. The thickness of the O-ring is greater than the depth of the groove 52 of the sealing surface 51 of the top end face of the annular seal 5. When the O-ring 51 is assembled into the groove 52 of the sealing surface 51 of the top end face of the annular seal 5, it will protrude a part of the sealing surface 512 of the top end face of the annular seal 5. When the pin-shaped bolt is tightened with the threaded portion 53 of the protruding portion of the upper end of the annular seal 5, the O-ring protruding on the annular seal 5 is pressed, so that the annular seal 5 and the test seal three 8 can be better sealed.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0036] The contents not described in detail in this utility model are known technologies.

Claims

1. An electronic component protection housing for a gas sensor, comprising a first protection housing, wherein a waterproof and breathable membrane and ventilation holes are provided on the first protection housing, and it is characterized in that: The protective housing 1 further has an annular seal, and the top end face of the annular seal has a sealing surface. When the sealing surface is fitted and sealed, a closed space that wraps the waterproof and breathable film and the ventilation holes can be formed.

2. The gas sensor electronic component protection housing according to claim 1, characterized in that: The area of the sealing surface is greater than 25 mm².

3. The gas sensor electronic component protection housing according to claim 2, characterized in that: The roughness of the sealing surface is less than 1.6 μm.

4. The gas sensor electronic component protection housing according to claim 3, wherein: The flatness of the sealing surface is less than 0.05 mm.

5. The gas sensor electronic component protection housing according to claim 1, characterized in that: The annular seal is higher than the upper surface of the protective housing 1, and the part of the annular seal protruding from the outer surface of the protective housing 1 forms an upper protruding part; when performing a sealing test on the gas sensor, the upper protruding part of the annular seal is closely fitted with an external test seal.

6. The gas sensor electronic component protection housing according to claim 1, characterized in that: A groove is provided on the sealing surface, and the groove is annular and surrounds the sealing surface for one week.

7. The gas sensor electronic component protection housing according to claim 6, characterized in that: The test seal has a flange that cooperates with the groove, the groove is adapted to the flange of the test seal, and the depth of the groove is less than the height of the flange of the test seal.

8. The gas sensor electronic component protection housing according to claim 7, characterized in that: A threaded portion is provided on the inner wall of the upper protruding part of the annular seal. The test seal includes an O-ring seal washer and a pin-shaped bolt. The threaded portion is tightened with the pin-shaped bolt through the O-ring seal washer, and the thickness of the O-ring seal washer is greater than the depth of the groove and they are matched with each other.

9. The gas sensor electronic component protection housing according to claim 4, characterized in that: The shape of the sealing surface is preferably circular.

Images