Waterproof barometer

Abstract

The utility model discloses a waterproof barograph relates to barograph technical field, waterproof barograph includes base plate, protective housing, shell and sensor component, the protective housing is connected in the base plate, and is equipped with the protective cavity, the protective housing is equipped with at least one through -hole that communicates the protective cavity, the shell is connected in the base plate, and is located in the protective cavity, the shell with the base plate encloses and forms the cavity, the shell is equipped with the open mouth that communicates the cavity with the protective cavity, the sensor component is connected in the base plate, and is located in the cavity, the cavity is equipped with waterproof adhesive, the waterproof adhesive is wrapped sensor component setting, wherein the aperture of through -hole is less than the aperture of open mouth. The utility model provides technical scheme to reduce the possibility of external foreign matter incorporation barograph waterproof adhesive, guarantees the precision of barograph.

Description

Technical Field

[0001] This utility model relates to the field of barometer technology, and in particular to a waterproof barometer. Background Technology

[0002] Waterproof barometers are widely used in outdoor sports, smart wearables, and weather monitoring. However, they face significant challenges in waterproofing when operating in humid, submerged, or high-humidity environments. Traditional barometer designs struggle to simultaneously meet waterproofing requirements, making them susceptible to moisture, which can lead to decreased measurement accuracy or even equipment damage. Therefore, the industry currently typically uses waterproof adhesive injection for encapsulation. However, this method requires openings in the barometer casing for adhesive injection, allowing foreign matter to easily enter and mix with the adhesive. This alters the internal stress of the adhesive, affecting the product's stress state, causing performance deviations, and resulting in inaccurate pressure readings. Utility Model Content

[0003] The main purpose of this invention is to provide a waterproof barometer, which aims to reduce the possibility of foreign matter being mixed into the waterproof adhesive of the barometer and to ensure the accuracy of the barometer.

[0004] To achieve the above objectives, this utility model proposes a waterproof barometer, which includes:

[0005] substrate;

[0006] A protective shell is connected to the substrate and has a protective cavity. The protective shell has at least one through hole communicating with the protective cavity.

[0007] A housing, connected to the substrate and disposed in the protective cavity; the housing and the substrate enclose a cavity, the housing having an opening communicating with the cavity and the protective cavity; and

[0008] A sensor assembly is connected to the substrate and disposed within the cavity, the cavity being filled with waterproof adhesive, and the waterproof adhesive encapsulating the sensor assembly.

[0009] The diameter of the through hole is smaller than the diameter of the opening.

[0010] In one embodiment, the aperture of the through hole ranges from 2 μm to 2 mm.

[0011] In one embodiment, the substrate is further provided with a groove between the protective shell and the housing, the groove being used to isolate the assembly stress of the protective shell.

[0012] In one implementation,

[0013] The width of the groove ranges from 0.05 mm to 2 mm;

[0014] And / or, the depth of the groove is between 0.05 mm and 2 mm;

[0015] And / or, the walls of the groove are metallized.

[0016] In one embodiment, the projection of the through hole and the projection of the opening do not overlap in the axial direction of the through hole.

[0017] In one embodiment, the axial direction of the opening is set at an angle to the axial direction of the through hole.

[0018] In one embodiment, the protective shell includes a top wall and a side wall connected at an angle, the side wall being connected to the substrate, the top wall and the substrate being disposed opposite to each other, and the top wall, the side wall and the substrate enclosing the protective cavity; wherein the top wall and / or the side wall are provided with through holes.

[0019] In one embodiment, the through holes include a plurality of through holes, which are spaced apart and formed on the top wall;

[0020] And / or, the opening is oriented toward the top wall, and the through hole is formed in the side wall.

[0021] In one embodiment, the housing is bonded to the substrate by a polymer adhesive;

[0022] And / or, the protective shell is welded to the substrate;

[0023] And / or, the waterproof adhesive is a gel adhesive.

[0024] In one embodiment, the sensor assembly includes an ASIC chip and a MEMS chip, the ASIC chip being connected to the substrate, and the MEMS chip being connected to the ASIC chip via a connecting wire.

[0025] The technical solution of this utility model involves mounting a housing on a substrate to form a cavity. A sensor assembly is connected to the substrate for both electrical and mechanical connections. The sensor assembly is disposed within the cavity, and the housing has an opening communicating with the cavity. A waterproof cavity is injected into the cavity through the opening to encapsulate the sensor assembly, thus improving its waterproof performance. A protective shell is also provided on the substrate, containing a protective cavity. Both the housing and the sensor assembly are located within the protective cavity. The protective shell has through holes with a diameter smaller than the opening diameter. This design ensures that the protective shell does not affect the sensor assembly's ability to sense external air pressure and significantly reduces the possibility of foreign objects entering the housing and adhering to the waterproof adhesive, thereby improving the reliability of the waterproof barometer. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0027] Figure 1 A schematic diagram of the structure of a waterproof barometer in one embodiment of this utility model;

[0028] Figure 2 A schematic diagram of the structure of the waterproof barometer in another embodiment of this utility model;

[0029] Figure 3 A schematic diagram of the structure of a waterproof barometer in another embodiment of this utility model.

[0030] Explanation of icon numbers:

[0031] 100. Waterproof barometer; 1. Substrate; 11. Groove; 2. Housing; 21. Cavity; 22. Opening; 3. Sensor assembly; 31. ASIC chip; 32. MEMS chip; 33. Connecting wire; 4. Protective shell; 41. Top wall; 42. Side wall; 43. Through hole; 44. Protective cavity; 5. Waterproof adhesive.

[0032] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0034] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0035] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0036] Currently, the industry typically uses waterproof adhesive injection for sealing and waterproofing. However, this method requires an opening to be made in the housing of the barometer for injection, which makes it easy for foreign objects to enter through the opening and mix into the adhesive. This alters the internal stress of the adhesive, thereby affecting the stress state of the product, causing performance deviations, and resulting in inaccurate barometer readings.

[0037] Based on the above technical issues, please refer to the following: Figures 1 to 3 As shown, this utility model proposes a waterproof barometer 100, which includes a base plate 1, a protective shell 4, a housing 2, and a sensor assembly 3. The protective shell 4 is connected to the base plate 1 and has a protective cavity 44. The protective shell 4 has at least one through hole 43 communicating with the protective cavity 44. The housing 2 is connected to the base plate 1 and is located in the protective cavity 44. The housing 2 and the base plate 1 enclose a cavity 21, and the housing 2 has an opening 22 communicating with the cavity 21 and the protective cavity 44. The sensor assembly 3 is connected to the base plate 1 and is located in the cavity 21. The cavity 21 is filled with waterproof adhesive 5, and the waterproof adhesive 5 wraps around the sensor assembly 3. The diameter of the through hole 43 is smaller than the diameter of the opening 22.

[0038] In this embodiment, the substrate 1 is the basic structure of the entire waterproof barometer 100, serving to support and connect other components. The housing 2 is connected to the substrate 1, and the housing 2 and the substrate 1 cooperate to form a cavity 21. The sensor assembly 3, as the core component of the waterproof barometer 100, is mechanically and electrically connected to the substrate 1. The sensor assembly 3 is located within the cavity 21, and the housing 2 protects the sensor assembly 3. Waterproof adhesive 5 is injected into the cavity 21, completely encasing the sensor assembly 3. This prevents moisture from directly contacting the sensor assembly 3 and affecting its performance and lifespan. It is understood that the waterproof adhesive 5 can conduct pressure, and the sensor assembly 3, encased in waterproof adhesive 5, can still accurately sense changes in external air pressure. The housing 2 has an opening 22 through which the waterproof adhesive 5 is injected into the cavity 21 during production. The housing 2 also prevents the waterproof adhesive 5 from overflowing. A protective shell 4 is also provided on the outside of the housing 2. The protective shell 4 is also connected to the substrate 1 and has a protective cavity 44. The housing 2 is located inside the protective cavity 44. Thus, the protective shell 4 and the housing 2 form a double protection, further improving the protection effect of the sensor assembly 3. The protective shell 4 has at least one through hole 43, which connects the protective cavity 44 to the external environment. The opening 22 connects the protective cavity 44 and the cavity 21, allowing external air pressure to be conducted into the protective cavity 44 through the through hole 43. The diameter of the through hole 43 is smaller than the diameter of the opening 22. The smaller diameter of the through hole 43 can effectively reduce the probability of impurities or foreign objects entering the cavity 21 and mixing into the waterproof adhesive 5, while the larger diameter of the opening 22 is conducive to the injection of the waterproof adhesive 5. By setting a smaller through hole 43, the possibility of external liquids and impurities or foreign objects entering the protective cavity 44 through the through hole 43 can be effectively reduced, avoiding stress changes caused by foreign objects mixed into the waterproof adhesive 5, thereby ensuring that the sensor assembly 3 can achieve high-precision waterproof air pressure detection.

[0039] In the production of the waterproof barometer 100, the housing 2 and sensor assembly 3 can first be mounted onto a small substrate 1 for testing to ensure the proper functioning of each component. After passing the tests, the housing 2 and sensor assembly 3, along with the small substrate 1, are then mounted onto other substrates 1, and a protective shell 4 is installed. The protective shell 4 can also be mounted onto other substrates 1. This reduces the size and weight of the waterproof barometer 100 during the testing phase, improves production efficiency during the testing phase, and facilitates modular assembly of the waterproof barometer 100, making it easy to integrate into different products. Optionally, the substrate 1 is a PCB substrate 1.

[0040] In embodiments of this utility model, such as Figure 1As shown, the aperture of the through-hole 43 ranges from 2μm to 2mm. This allows gas to pass through while effectively preventing solid impurities or foreign objects larger than 2mm from directly entering the protective cavity 44. This reduces the probability of impurities or foreign objects entering the cavity 21 through the protective cavity 44 and mixing with the waterproof adhesive 5, thus reducing interference with the waterproof adhesive 5 and sensor assembly 3 within the cavity 21. In practical implementation, if the aperture of the through-hole 43 is too small, the gas flow rate will decrease, leading to a longer sensor response time and reduced dynamic measurement accuracy. Furthermore, the through-hole 43 is easily clogged by dust and impurities, increasing maintenance costs. If the aperture of the through-hole 43 is too large, the possibility of impurities entering the protective cavity 44 increases, increasing the risk of interference with the waterproof adhesive 5 and sensor assembly 3. Therefore, the aperture of the through-hole 43 can be set according to actual conditions. Optionally, the aperture of the through-hole 43 can be 2μm, 5μm, 10μm, 100μm, 0.2mm, 2mm, etc., without specific limitations.

[0041] In one embodiment, when the diameter of the through hole 43 is 2 μm, the diameter of the opening 22 is not less than 0.2 mm. If the diameter of the opening 22 is too small, it is difficult for the dispensing needle to be inserted into the cavity 21, increasing the difficulty of dispensing. Furthermore, the flow resistance of the waterproof adhesive 5 is high, which easily generates air bubbles, affecting the waterproof effect. At the same time, the dispensing pressure will increase, leading to damage to the sensor assembly 3.

[0042] In embodiments of this utility model, such as Figure 3 As shown, the substrate 1 is also provided with a groove 11, which is located between the protective shell 4 and the shell 2. The groove 11 is used to isolate the assembly stress of the protective shell 4.

[0043] In this embodiment, the substrate 1 has a groove 11 in the area between the protective shell 4 and the housing 2. Since the groove 11 reduces the cross-sectional thickness of the substrate 1 at this location, the assembly stress is partially absorbed and redistributed at the groove 11 when the protective shell 4 is installed, thereby reducing the stress transmitted to the housing 2 and the sensor assembly 3, and preventing it from affecting the connection between the housing 2 and the sensor assembly 3 and the substrate 1 and the stability of the sensor operation.

[0044] Specifically, the groove 11 is arranged in a ring shape, surrounding the area where the housing 2 is located. Understandably, the arrangement of the groove 11 also facilitates the positioning and installation of the housing 2.

[0045] In embodiments of this utility model, such as Figure 3 As shown, the width of the groove 11 ranges from 0.05mm to 2mm. If the groove 11 is too narrow, the installation stress of the protective shell 4 will not be adequately released, and the residual stress will be directly transmitted to the shell 2 and the sensor assembly 3, resulting in a decrease in the stability of the sensor assembly 3. If the groove 11 is too wide, the effective support area of ​​the substrate 1 will be reduced, which is detrimental to the strength of the substrate 1 itself.

[0046] Optionally, the width of the groove 11 can be 0.05mm, 0.1mm, 0.15mm, 0.5mm, 1mm, 1.5mm, 2mm, etc., and no specific limitation is made here.

[0047] In one embodiment, the depth of the groove 11 is between 0.05 mm and 2 mm. If the groove 11 is too shallow, the groove 11 will not be effective in isolating stress and will not be able to effectively protect the assembly stress of the protective shell 4. The sensor assembly 3 may undergo slight deformation, which will affect its performance. If the groove 11 is too deep, the local rigidity of the substrate 1 will drop sharply, which will easily lead to cracking. It may also reduce the connection strength between the substrate 1 and the shell 2, the sensor assembly 3 and the protective shell 4, and affect the normal conduction of the internal circuit of the substrate 1.

[0048] Optionally, the depth of the groove 11 can be 0.05mm, 0.1mm, 0.15mm, 0.5mm, 1mm, 1.5mm, 2mm, etc., and no specific limitation is made here.

[0049] In one embodiment, the walls of the groove 11 are metallized. This strengthens the substrate 1, prevents debris residue from remaining during slotting, prevents debris from affecting other components on the substrate 1, and also improves the smoothness of the groove walls, making it less likely for impurities or foreign objects to remain. Optionally, the walls of the groove 11 may be gold-plated.

[0050] In embodiments of this utility model, such as Figure 2 As shown, the projection of the through hole 43 and the projection of the opening 22 do not overlap in the axial direction along the through hole 43.

[0051] In this embodiment, when projecting orthographically onto the axis of the through-hole 43, the projection area of ​​the through-hole 43 does not overlap with the projection area of ​​the opening 22, meaning they are spatially misaligned. This misalignment prevents airflow and impurities or foreign objects entering the protective cavity 44 from the through-hole 43 from directly passing through the opening 22 into the cavity 21. This increases the complexity of the path for impurities or foreign objects to enter the cavity 21 from the through-hole 43, thereby reducing the probability of impurities or foreign objects entering the cavity 21 and mixing with the waterproof adhesive 5. This further prevents the waterproof adhesive 5 and sensor assembly 3 injected into the cavity 21 from being contaminated by external factors, improving the accuracy and stability of air pressure detection.

[0052] In one embodiment, when the axial direction of the through hole 43 is perpendicular to the substrate 1, the axial direction of the opening 22 can also be perpendicular to the substrate 1, and the two are eccentrically arranged, and their projections do not overlap on a plane parallel to the substrate 1.

[0053] In another embodiment, the projection of the through hole 43 and the projection of the opening 22 can be overlapped along the axial direction of the through hole 43, which can also play a certain role in preventing impurities or foreign objects.

[0054] In embodiments of this utility model, such as Figure 2 As shown, the axial direction of the opening 22 is set at an angle to the axial direction of the through hole 43.

[0055] In this embodiment, an angle is formed between the central axis of the opening 22 on the housing 2 and the central axis of the through hole 43 on the protective housing 4. This prevents airflow and impurities or foreign objects entering the protective cavity 44 from the through hole 43 from traveling in a straight line along the axis of the through hole 43 and directly passing through the opening 22. They must change their direction of movement before entering the cavity 21, thereby increasing the complexity of the path for impurities or foreign objects to enter the cavity 21 and reducing the probability of impurities or foreign objects directly entering the cavity 21 and mixing with the waterproof adhesive 5, thus improving the impurity or foreign object protection effect of the waterproof barometer 100. It can be understood that in this embodiment, the projections of the opening 22 and the through hole 43 on the axial direction of the through hole 43 can overlap.

[0056] Optionally, the axial direction of the opening 22 is perpendicular to the axial direction of the through hole 43.

[0057] In one embodiment, the positional relationship between the through hole 43 and the opening 22 satisfies both the requirement that the projection of the through hole 43 and the projection of the opening 22 do not overlap in the axial direction along the through hole 43, and that the axial direction of the opening 22 is at an angle to the axial direction of the through hole 43. This further effectively increases the difficulty for impurities or foreign objects to enter the cavity 21 and improves the reliability of the sensor assembly 3 detection.

[0058] In one embodiment, the through hole 43 can be arranged in multiple folds, which also serves to prevent impurities or foreign objects from entering the protective cavity 44.

[0059] In embodiments of this utility model, such as Figures 1 to 3 As shown, the protective shell 4 includes a top wall 41 and a side wall 42 connected at an angle. The side wall 42 is connected to the substrate 1. The top wall 41 and the substrate 1 are arranged opposite to each other. The top wall 41, the side wall 42 and the substrate 1 enclose a protective cavity 44. The top wall 41 and / or the side wall 42 are provided with through holes 43.

[0060] In this embodiment, the top wall 41 and the side wall 42 are arranged at an angle, the side wall 42 is connected to the substrate 1 below, the top wall 41 is arranged opposite to the substrate 1, and the top wall 41, the side wall 42 and the substrate 1 together form a protective cavity 44.

[0061] Specifically, the angle between the top wall 41 and the side wall 42 can be a right angle, an acute angle, or an obtuse angle to meet different spatial layout requirements. In actual implementation, the protective shell 4 can be set in the shape of a cube, cuboid, or column.

[0062] In actual implementation, the through hole 43 can be located on the top wall 41, the side wall 42, or both. Optionally, when the opening 22 faces the top wall 41, the through hole 43 is located on the side wall 42; when the opening 22 faces the side wall 42, the through hole 43 is located on the top wall 41. This avoids impurities or foreign objects from easily entering the cavity 21 through the through hole 43 and the opening 22 due to their relative arrangement, thereby reducing the probability of impurities or foreign objects directly entering the cavity 21 and mixing with the waterproof adhesive 5.

[0063] Optionally, the number of through holes 43 is at least one, and can be one, two, three, etc., without specific limitation here.

[0064] In embodiments of this utility model, such as Figure 1 As shown, there are multiple through holes 43, which are spaced apart on the top wall 41.

[0065] In this embodiment, there are multiple through holes 43, which are opened evenly or at intervals on the top wall 41 of the protective shell 4.

[0066] Optionally, multiple through holes 43 are arranged in a ring array or matrix on the top wall 41, with the center distance between holes being greater than twice the hole diameter to ensure structural strength. The arrangement of multiple through holes 43 can reduce the possibility of the through holes 43 being completely blocked. Even if a single through hole 43 is blocked, the other through holes 43 can still allow normal ventilation, thus improving the reliability of the waterproof barometer 100.

[0067] In one embodiment, such as Figure 2 As shown, the opening 22 faces the top wall 41, and the through holes 43 are formed in the side wall 42. When the opening 22 is directly opposite the top wall 41 along the axial direction, all the through holes 43 are moved to the side wall 42, so that impurities or foreign objects entering through the through holes 43 are also difficult to enter the cavity 21 through the opening 22. Optionally, the through holes 43 formed in the side wall 42 may also include multiple through holes 43, and the multiple through holes 43 are arranged in a ring array or matrix on the top wall 41.

[0068] Optionally, when the through hole 43 is opened on the side wall 42, the wall surface of the housing 2 facing the through hole 43 can be concave to block the airflow entering from the through hole 43, thereby reducing the possibility of impurities or foreign objects entering the cavity 21 and being mixed with the waterproof adhesive 5.

[0069] In this embodiment of the invention, the housing 2 is bonded to the substrate 1 using a polymer adhesive. In this embodiment, the polymer adhesive is adaptable to different material surfaces, such as metals, ceramics, and plastics, exhibiting good adhesion and stability, thus ensuring the sealing and mechanical strength between the housing 2 and the substrate 1.

[0070] Optionally, the protective shell 4 is fixed to the substrate 1 by welding. Welding can provide a high-strength mechanical connection and good airtightness, ensuring the sealing performance between the protective shell 4 and the substrate 1.

[0071] In practice, the protective shell 4 is made of metal and is soldered to the corresponding pads on the substrate 1 using solder paste. The protective shell 4 can be grounded by soldering to the substrate 1, which allows the protective shell 4 to effectively conduct static electricity or external interference current into the grounding system of the substrate 1, thereby improving the electromagnetic compatibility and measurement accuracy of the barometer.

[0072] Optionally, the waterproof adhesive 5 is a gel adhesive. Gel adhesive has good elasticity and waterproof properties, and can form a protective layer around the sensor assembly 3. After curing, the gel adhesive maintains a certain degree of flexibility, which can effectively buffer external impacts and vibrations, while achieving uniform pressure transmission and ensuring the pressure detection accuracy of the sensor assembly 3.

[0073] In one embodiment, the housing 2 is bonded to the substrate 1 with a polymer adhesive, and the waterproof adhesive 5 is a gel adhesive. This allows the polymer adhesive and the waterproof adhesive 5 to achieve good contact and melting, reducing the possibility of air bubbles remaining in the waterproof adhesive 5, further improving the sealing of the sensor assembly 3 and ensuring waterproof performance.

[0074] In embodiments of this utility model, such as Figures 1 to 3 As shown, the sensor assembly 3 includes an ASIC chip 31 and a MEMS chip 32. The ASIC chip 31 is connected to the substrate 1, and the MEMS chip 32 is connected to the ASIC chip 31 via a connecting line 33.

[0075] In this embodiment, the ASIC (Application-Specific Integrated Circuit) chip is directly mounted on the pre-defined pad area of ​​the substrate 1 using surface mounting or flip-chip methods, forming a reliable electrical and mechanical connection. The MEMS (Micro-Electro-Mechanical Systems) chip is located above the ASIC chip 31. The MEMS chip 32 is capable of undergoing minute deformation under external air pressure, converting the air pressure signal into an electrical signal. The ASIC chip 31 amplifies, filters, and performs analog-to-digital conversion on the raw signal from the MEMS chip 32, extracting useful information and improving signal quality and accuracy. Together, they achieve high-precision air pressure detection.

[0076] In actual implementation, the ASIC chip 31 and MEMS chip 32 achieve signal conduction through a metal connecting wire 33, which can be a gold wire or a copper wire, etc. The ASIC chip 31 and MEMS chip 32 are disposed within the cavity 21 of the housing 2, and both are completely wrapped by waterproof adhesive 5. The waterproof adhesive 5 not only isolates moisture, preventing the operation of the ASIC chip 31 and MEMS chip 32 from being affected, but also transmits external pressure to the detection area of ​​the MEMS chip 32, so that the sensor assembly 3 can perform pressure detection.

[0077] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A waterproof barometer, characterized in that, The waterproof barometer includes: substrate; A protective shell is connected to the substrate and has a protective cavity. The protective shell has at least one through hole communicating with the protective cavity. A housing, connected to the substrate and disposed in the protective cavity; the housing and the substrate enclose a cavity, the housing having an opening communicating with the cavity and the protective cavity; and A sensor assembly is connected to the substrate and disposed within the cavity, the cavity being filled with waterproof adhesive, and the waterproof adhesive encapsulating the sensor assembly. The diameter of the through hole is smaller than the diameter of the opening.

2. The waterproof barometer as described in claim 1, characterized in that, The diameter of the through hole ranges from 2μm to 2mm.

3. The waterproof barometer as described in claim 1, characterized in that, The substrate is also provided with a groove, which is located between the protective shell and the housing, and the groove is used to isolate the assembly stress of the protective shell.

4. The waterproof barometer as described in claim 3, characterized in that, The width of the groove ranges from 0.05 mm to 2 mm; And / or, the depth of the groove is between 0.05 mm and 2 mm; And / or, the walls of the groove are metallized.

5. The waterproof barometer as described in any one of claims 1 to 4, characterized in that, Along the axial direction of the through hole, the projection of the through hole and the projection of the opening do not overlap.

6. The waterproof barometer as described in any one of claims 1 to 4, characterized in that, The axial direction of the opening is set at an angle to the axial direction of the through hole.

7. The waterproof barometer as described in any one of claims 1 to 4, characterized in that, The protective shell includes a top wall and a side wall connected at an angle. The side wall is connected to the substrate. The top wall and the substrate are disposed opposite to each other. The top wall, the side wall and the substrate enclose the protective cavity. The top wall and / or the side wall are provided with through holes.

8. The waterproof barometer as described in claim 7, characterized in that, The through holes include a plurality of holes, which are spaced apart and formed on the top wall; And / or, the opening is oriented toward the top wall, and the through hole is formed in the side wall.

9. The waterproof barometer as described in any one of claims 1 to 4, characterized in that, The shell is bonded to the substrate with polymer adhesive; And / or, the protective shell is welded to the substrate; And / or, the waterproof adhesive is a gel adhesive.

10. The waterproof barometer as described in claim 1, characterized in that, The sensor assembly includes an ASIC chip and a MEMS chip. The ASIC chip is connected to the substrate, and the MEMS chip is connected to the ASIC chip via a connecting wire.

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