Air pressure sensor

Abstract

The utility model provides an air pressure sensor. The air pressure sensor comprises a first shell, a second shell and an air pressure sensing assembly, the first shell is provided with an air inlet and a first air inlet channel; the first air inlet channel communicates with the air inlet and allows air entering through the air inlet to penetrate through. The second shell is provided with a second air inlet channel and a containing groove. The second air inlet channel is located between the first air inlet channel and the containing groove and communicates with the first air inlet channel and the containing groove. The inner diameter of the second air inlet channel is gradually increased in the gas transmission direction. The air pressure sensing assembly is accommodated in the accommodating groove; the air pressure sensing assembly comprises a circuit board and an air pressure sensor chip, the air pressure sensor chip is electrically connected with the circuit board, and the sensing end of the air pressure sensor chip faces the output end of the second air inlet channel and allows air entering through the second air inlet channel to pass through so that the air can flow to the sensing end of the air pressure sensor chip better. Detection under compatible atmospheric pressure is realized, and the compatibility of the air pressure sensor is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of air pressure sensors, and in particular to an air pressure sensor. Background Technology

[0002] With the development of technology, automotive intelligence is becoming increasingly sophisticated, requiring greater sensitivity to ambient air pressure. Air pressure sensors are used in vehicles to detect air pressure. In existing technology, air pressure sensors consist of a first housing, a second housing, and an air pressure sensing component. The second housing is connected to the first housing, and an air intake channel is provided between the first and second housings. The air pressure sensing component is positioned relative to the end of the air intake channel. Since the inner diameter of the air intake channel is uniform, it is incompatible under atmospheric pressure, resulting in poor compatibility of existing air pressure sensors. Utility Model Content

[0003] The purpose of this utility model is to provide a pressure sensor. A first housing has an air inlet and a first air inlet channel. The air inlet is located on the outer wall of the first housing, and the first air inlet channel connects to the air inlet and allows gas entering through the air inlet to pass through. A second housing is located on one side of the first housing. The second housing has a second air inlet channel and a receiving groove. The second air inlet channel is located between the first air inlet channel and the receiving groove, and connects the first air inlet channel and the receiving groove. The inner diameter of the second air inlet channel gradually increases along the gas transmission direction. A pressure sensing component is housed in the receiving groove. The pressure sensing component includes a circuit board and a pressure sensor chip. The pressure sensor chip is electrically connected to the circuit board, and the sensing end of the pressure sensor chip faces the output end of the second air inlet channel, allowing gas entering through the second air inlet channel to pass through, so that the gas can flow better to the sensing end of the pressure sensor chip, thereby achieving detection compatible with atmospheric pressure and improving the compatibility of the pressure sensor.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a barometric pressure sensor, applied in a vehicle; the barometric pressure sensor includes:

[0005] The first housing has an air inlet and a first air intake channel; the air inlet is located on the outer side wall of the first housing, and the first air intake channel is connected to the air inlet and allows gas entering through the air inlet to pass through.

[0006] A second housing is disposed on one side of the first housing; the second housing is provided with a second air inlet channel and a receiving groove; the second air inlet channel is located between the first air inlet channel and the receiving groove, and connects the first air inlet channel and the receiving groove; the inner diameter of the second air inlet channel gradually increases along the gas transmission direction;

[0007] A pressure sensing component is housed in the receiving slot; the pressure sensing component includes a circuit board and a pressure sensor chip, the pressure sensor chip is electrically connected to the circuit board, the sensing end of the pressure sensor chip faces the output end of the second air inlet channel, and is used by the gas entering through the second air inlet channel.

[0008] Optionally, the second air inlet channel includes multiple sub-channels, which are located between the first air inlet channel and the pressure sensor chip and are arranged sequentially along the direction toward the pressure sensor chip; the multiple sub-channels are connected in sequence.

[0009] Optionally, in the direction toward the pressure sensor chip, the inner diameter of the sub-channel closer to the pressure sensor chip in two adjacent sub-channels is larger than that of the other sub-channel in the two adjacent sub-channels.

[0010] Optionally, two adjacent sub-channels are perpendicular to each other and interconnected.

[0011] Optionally, the end of the plurality of sub-channels is directly opposite the sensing end of the barometric pressure sensor chip.

[0012] Optionally, the pressure sensing component further includes a sealing gasket, which is located between the pressure sensor chip and the second housing;

[0013] The sealing gasket is provided with ventilation holes, which connect to the end of the plurality of sub-channels and expose the sensing end of the pressure sensor chip;

[0014] The end of the plurality of sub-channels outputs gas to the vent.

[0015] Optionally, the end sub-channels of the plurality of sub-channels are arranged in a square shape;

[0016] The sealing gasket is arranged relative to the end of the plurality of sub-channels, and the vent is located near the middle of the end of the plurality of sub-channels;

[0017] The ventilation hole is a long, narrow opening.

[0018] Optionally, the receiving groove is provided with an opening that extends horizontally or vertically and is exposed to the external environment;

[0019] The pressure sensing component also includes a sealing colloid that is sealed to the second housing and blocks the opening; the sealing colloid supports the circuit board and the pressure sensor chip.

[0020] Optionally, the pressure sensor may further include a plurality of first sealing rings;

[0021] The second housing is detachably connected to the first housing; the first sealing ring is connected to the second housing and seals the connection between the second housing and the first housing.

[0022] Optionally, the first housing is connected to a second sealing ring, which seals the first housing, and the first air inlet channel is opened in the second sealing ring; multiple air inlets are provided, and the multiple air inlets converge in the same first air inlet channel along different directions.

[0023] Compared with the prior art, the beneficial effects of this utility model are:

[0024] This utility model provides a barometric pressure sensor. A first housing has an air inlet and a first air inlet channel. The air inlet is located on the outer wall of the first housing, and the first air inlet channel connects to the air inlet and allows gas entering through the air inlet to pass through. A second housing is located on one side of the first housing. The second housing has a second air inlet channel and a receiving groove. The second air inlet channel is located between the first air inlet channel and the receiving groove, and connects the first air inlet channel and the receiving groove. The inner diameter of the second air inlet channel gradually increases along the gas transmission direction. A barometric pressure sensing component is housed in the receiving groove. The barometric pressure sensing component includes a circuit board and a barometric pressure sensor chip. The barometric pressure sensor chip is electrically connected to the circuit board. The sensing end of the barometric pressure sensor chip faces the output end of the second air inlet channel, allowing gas entering through the second air inlet channel to pass through, so that the gas can flow better to the sensing end of the barometric pressure sensor chip, thereby achieving detection compatible with atmospheric pressure and improving the compatibility of the barometric pressure sensor. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings. In the following description, the same reference numerals denote the same parts.

[0027] Figure 1 A schematic diagram of a pressure sensor according to an embodiment of this application is shown.

[0028] Figure 2 A cross-sectional view of a pressure sensor according to an embodiment of this application is shown.

[0029] Figure 3 Another cross-sectional view of a barometric pressure sensor according to an embodiment of this application is shown.

[0030] Figure 4 A schematic diagram of a pressure sensing component of a pressure sensor according to an embodiment of this application is shown.

[0031] Figure 5 A schematic diagram of the first housing of a barometric pressure sensor according to an embodiment of this application is shown.

[0032] Figure 6 A schematic diagram of the sealing gasket of a pressure sensor according to one embodiment of this application is shown.

[0033] Figure Labels

[0034] 100. Barometric pressure sensor;

[0035] 10. First housing; 10a. Air inlet; 10b. First air inlet channel; 11. Second sealing ring;

[0036] 20. Second housing; 20a. Receiving groove; 20b. Opening; 21. Second air inlet channel; 211. Sub-channel;

[0037] 30. Barometric pressure sensing assembly; 31. Circuit board; 32. Barometric pressure sensor chip; 33. Sealing gasket; 33a. Ventilation hole; 34. Sealing colloid;

[0038] 40. First sealing ring. Detailed Implementation

[0039] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0040] Please refer to the attached document. Figures 1-6 This application provides a bar pressure sensor 100, which is applied to a vehicle and is used to detect bar pressure.

[0041] Please refer to the attached document. Figures 1-6In this embodiment, the pressure sensor 100 includes a first housing 10, a second housing 20, and a pressure sensing assembly 30. The first housing 10 has an air inlet 10a and a first air inlet channel 10b. The air inlet 10a is located on the outer side wall of the first housing 10, and the first air inlet channel 10b connects to the air inlet 10a and allows gas entering through the air inlet 10a to pass through. The second housing 20 is located on one side of the first housing 10. The second housing 20 has a second air inlet channel 21 and a receiving groove 20a. The second air inlet channel 21 is located between the first air inlet channel 10b and the receiving groove 20a, and connects to the first air inlet channel 30. The air inlet channel 10b and the receiving groove 20a are included; the inner diameter of the second air inlet channel 21 gradually increases along the gas transmission direction; the pressure sensing component 30 is housed in the receiving groove 20a; the pressure sensing component 30 includes a circuit board 31 and a pressure sensor chip 32, the pressure sensor chip 32 is electrically connected to the circuit board 31, the sensing end of the pressure sensor chip 32 faces the output end of the second air inlet channel 21, and the gas entering through the second air inlet channel 21 passes through it, so that the gas can flow better to the sensing end of the pressure sensor chip 32, so as to achieve detection compatible with atmospheric pressure and improve the compatibility of the pressure sensor 100.

[0042] Please refer to the attached document. Figures 1-6 In this embodiment of the application, the first housing 10 is provided with an air inlet 10a and a first air inlet channel 10b; the air inlet 10a is opened on the outer side wall of the first housing 10, and the first air inlet channel 10b is connected to the air inlet 10a and allows the gas entering through the air inlet 10a to pass through, so that the gas in the external environment can flow into the first air inlet channel 10b through the air inlet 10a.

[0043] The second housing 20 is disposed inside the first housing 10; the second housing 20 is provided with a second air inlet channel 21 and a receiving groove 20a; the second air inlet channel 21 is located between the first air inlet channel 10b and the receiving groove 20a, and connects the first air inlet channel 10b and the receiving groove 20a; the inner diameter of the second air inlet channel 21 gradually increases along the gas transmission direction; so that the gas in the external environment can flow sequentially through the first air inlet channel 10b and the second air inlet channel 21 into the receiving groove 20a. By gradually expanding the arrangement, the gas flow velocity decreases. According to Bernoulli's equation, as the flow velocity decreases, the static pressure of the gas will increase accordingly, which is conducive to establishing a relatively stable gas pressure environment in the receiving groove 20a and ensuring the stability of the gas.

[0044] The pressure sensing component 30 is housed in the receiving groove 20a. The pressure sensing component 30 includes a circuit board 31 and a pressure sensor chip 32. The pressure sensor chip 32 is electrically connected to the circuit board 31. The sensing end of the pressure sensor chip 32 faces the output end of the second air inlet channel 21 and allows the gas entering through the second air inlet channel 21 to pass through, so that the gas can flow better to the sensing end of the pressure sensor chip 32, thereby achieving detection compatible with atmospheric pressure and improving the compatibility of the pressure sensor 100.

[0045] Please refer to the attached document. Figures 1-5 In this embodiment, the second air inlet channel 21 includes multiple sub-channels 211, which are located between the first air inlet channel 10b and the pressure sensor chip 32, and are arranged sequentially in the direction toward the pressure sensor chip 32. The multiple sub-channels 211 are connected in sequence so that the gas in the first air inlet channel 10b can flow to the pressure sensor chip 32 through the multiple sub-channels 211. By arranging the multiple sub-channels 211 to be connected in sequence, the gas can be diverted and redistributed multiple times, so that the gas can be more evenly distributed before entering the receiving tank 20a, avoiding the accumulation of gas in local areas or the situation of excessive or insufficient flow, ensuring that the pressure sensor chip 32 can receive a relatively uniform airflow, thereby improving the detection accuracy and stability of the pressure sensor 100.

[0046] Please refer to the attached document. Figures 1-5 In this embodiment, in the direction toward the pressure sensor chip 32, the inner diameter of the sub-channel 211 closer to the pressure sensor chip 32 among two adjacent sub-channels 211 is larger than that of the other sub-channel 211 among the two adjacent sub-channels 211. This helps the gas to flow more smoothly when it reaches the vicinity of the pressure sensor chip 32. When the gas enters the sub-channel 211 with the larger inner diameter closer to the pressure sensor chip 32, the gas distribution in the sub-channel 211 is more uniform, reducing local pressure differences, so that the pressure sensor chip 32 can detect the average gas pressure more accurately.

[0047] Please refer to the attached document. Figures 1-5 In this embodiment, two adjacent sub-channels 211 are perpendicular to each other and interconnected, allowing multiple sub-channels 211 to extend to the pressure sensor chip 32 in different directions. This facilitates changes in the gas flow direction, enabling a more uniform gas distribution as it enters the next sub-channel 211. When gas flows from one sub-channel 211 into another perpendicular sub-channel 211, its flow direction changes, helping to reduce turbulence and eddies within the sub-channel 211. The pressure can be adjusted to a certain extent during the transition, preventing abrupt changes in gas pressure from impacting the pressure sensor chip 32 and improving the detection accuracy and stability of the pressure sensor chip 32.

[0048] Please refer to the attached document. Figures 1-5 In this embodiment, the end of the multiple sub-channels 211 is directly opposite the sensing end of the pressure sensor chip 32, so that the gas output from the end of the multiple sub-channels 211 can come into contact with the sensing end of the pressure sensor chip 32, thereby facilitating the pressure detection of the gas by the sensing end of the pressure sensor chip 32.

[0049] Please refer to the attached document. Figures 1-6 In this embodiment, the pressure sensing component 30 further includes a sealing gasket 33, which is located between the pressure sensor chip 32 and the second housing 20. The sealing gasket 33 has a ventilation hole 33a, which connects to the end of the multiple sub-channels 211 and exposes the sensing end of the pressure sensor chip 32. The end of the multiple sub-channels 211 outputs gas to the ventilation hole 33a, so that the gas output from the end of the multiple sub-channels 211 is gathered by the sealing gasket 33 and flows to the sensing end of the pressure sensor chip 32 through the ventilation hole 33a. This avoids the gas output from the end of the multiple sub-channels 211 being too dispersed, thus ensuring the detection effect of the sensing end of the pressure sensor chip 32.

[0050] Please refer to the attached document. Figures 1-6 In this embodiment, the end sub-channels 211 of the multiple sub-channels 211 are arranged in a square shape, which is beneficial for the gas to be more evenly distributed after entering the end sub-channels 211. The sealing gasket 33 is arranged relative to the end sub-channels 211 of the multiple sub-channels 211, which can seal the end of the sub-channels 211 to prevent gas leakage. At the same time, it can also play a certain role in buffering and protection, reducing the impact of external vibration on the pressure sensor chip 32, and improving the reliability and stability of the pressure sensor 100. The ventilation hole 33a is close to the middle of the end sub-channels 211 of the multiple sub-channels 211, effectively guiding the gas into the area sealed by the sealing gasket 33 and making it evenly distributed around the pressure sensor chip 32, ensuring that the pressure sensor chip 32 can accurately detect the gas pressure. Optionally, the ventilation hole 33a is an elongated hole.

[0051] Please refer to the attached document. Figures 1-2In this embodiment, the receiving groove 20a is provided with an opening 20b, which extends horizontally or vertically and is exposed to the external environment. This allows the pressure sensing component 30 to enter the receiving groove 20a from the external environment through the opening 20b, thereby enabling the pressure sensing component 30 to be assembled relative to the second housing 20. The pressure sensing component 30 also includes a sealing colloid 34, which is sealed to the second housing 20 and blocks the opening 20b. The sealing colloid 34 supports the circuit board 31 and the pressure sensor chip 32, so that the circuit board 31 and the pressure sensor chip 32 are sealed with the opening 20b through the sealing colloid 34, preventing gas from the external environment from flowing to the pressure sensor chip 32 through the opening 20b and avoiding affecting the detection accuracy of the pressure sensor chip 32.

[0052] Please refer to the attached document. Figures 1-2 In this embodiment, the pressure sensor 100 further includes a plurality of first sealing rings 40; the second housing 20 is detachably connected to the first housing 10 so that the second housing 20 can be connected to or detached from the first housing 10, thereby improving the ease of installation and removal between the second housing 20 and the first housing 10; the first sealing rings 40 are connected to the second housing 20 and seal the connection between the second housing 20 and the first housing 10. By arranging a plurality of first sealing rings 40 to seal a plurality of the connection between the second housing 20 and the first housing 10, gas from the external environment is prevented from entering the pressure sensor chip 32 through the connection between the second housing 20 and the first housing 10, thereby avoiding affecting the detection accuracy of the pressure sensor chip 32.

[0053] Please refer to the attached document. Figures 1-2 In this embodiment, the first housing 10 is connected to a second sealing ring 11, which seals the first housing 10. The first air inlet channel 10b is opened in the second sealing ring 11. Multiple air inlets 10a are provided, and the multiple air inlets 10a converge in the same first air inlet channel 10b along different directions. The multiple air inlets 10a arranged along different directions can collect gas from different directions more widely, ensuring that the gas can fully enter the first air inlet channel 10b and improving the efficiency of gas collection.

[0054] Compared with the prior art, the beneficial effects of this utility model are:

[0055] This utility model provides a barometric pressure sensor 100. A first housing 10 has an air inlet 10a and a first air inlet channel 10b. The air inlet 10a is located on the outer side wall of the first housing 10, and the first air inlet channel 10b connects to the air inlet 10a and allows gas entering through the air inlet 10a to pass through. A second housing 20 is disposed on one side of the first housing 10. The second housing 20 has a second air inlet channel 21 and a receiving groove 20a. The second air inlet channel 21 is located between the first air inlet channel 10b and the receiving groove 20a, and connects the first air inlet channel 10b and the receiving groove 20a. The inner diameter of the second air inlet channel 21 gradually increases along the gas transmission direction; the pressure sensing component 30 is housed in the receiving groove 20a; the pressure sensing component 30 includes a circuit board 31 and a pressure sensor chip 32, the pressure sensor chip 32 is electrically connected to the circuit board 31, the sensing end of the pressure sensor chip 32 faces the output end of the second air inlet channel 21, and the gas entering through the second air inlet channel 21 passes through it, so that the gas can flow better to the sensing end of the pressure sensor chip 32, so as to achieve detection compatible with atmospheric pressure and improve the compatibility of the pressure sensor 100.

[0056] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0057] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features.

[0058] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A gas pressure sensor characterized by comprising: Applied to vehicles; The pressure sensor includes: The first housing has an air inlet and a first air intake channel; the air inlet is opened on the outer side wall of the first housing, and the first air intake channel is connected to the air inlet and allows gas entering through the air inlet to pass through. A second housing is disposed on one side of the first housing; the second housing is provided with a second air inlet channel and a receiving groove; the second air inlet channel is located between the first air inlet channel and the receiving groove, and connects the first air inlet channel and the receiving groove; the inner diameter of the second air inlet channel gradually increases along the gas transmission direction; A pressure sensing component is housed in the receiving slot; the pressure sensing component includes a circuit board and a pressure sensor chip, the pressure sensor chip is electrically connected to the circuit board, the sensing end of the pressure sensor chip faces the output end of the second air inlet channel, and is used by the gas entering through the second air inlet channel.

2. The air pressure sensor according to claim 1, characterized in that, The second air inlet channel includes multiple sub-channels, which are located between the first air inlet channel and the pressure sensor chip and are arranged sequentially in the direction toward the pressure sensor chip; the multiple sub-channels are connected in sequence.

3. The air pressure sensor according to claim 2, characterized in that In the direction toward the pressure sensor chip, the inner diameter of the sub-channel closer to the pressure sensor chip in two adjacent sub-channels is larger than that of the other sub-channel in the two adjacent sub-channels.

4. The air pressure sensor according to claim 3, characterized in that The two adjacent sub-channels are perpendicular to each other and connected to each other.

5. The air pressure sensor according to claim 3, characterized in that, The end of the plurality of sub-channels is directly opposite the sensing end of the barometric pressure sensor chip.

6. The air pressure sensor according to claim 5, characterized in that The pressure sensing component also includes a sealing gasket, which is located between the pressure sensor chip and the second housing. The sealing gasket is provided with ventilation holes, which connect to the end of the plurality of sub-channels and expose the sensing end of the pressure sensor chip; The end of the plurality of sub-channels outputs gas to the vent.

7. The air pressure sensor according to claim 6, characterized in that The sub-channels at the ends of the plurality of sub-channels are arranged in a square shape; The sealing gasket is arranged relative to the end of the plurality of sub-channels, and the vent is located near the middle of the end of the plurality of sub-channels; The ventilation hole is a long, narrow opening.

8. The air pressure sensor of claim 6, wherein, The receiving slot has an opening that extends horizontally or vertically and is exposed to the external environment. The pressure sensing component also includes a sealing colloid that is sealed to the second housing and blocks the opening; the sealing colloid supports the circuit board and the pressure sensor chip.

9. The pressure sensor according to claim 1, characterized in that, The pressure sensor also includes multiple first sealing rings; The second housing is detachably connected to the first housing; the first sealing ring is connected to the second housing and seals the connection between the second housing and the first housing.

10. The air pressure sensor of claim 1, wherein, The first housing is connected to a second sealing ring, which seals the first housing. The first air inlet channel is opened in the second sealing ring. Multiple air inlets are provided, and the multiple air inlets converge in the same first air inlet channel along different directions.

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