Pressure sensor

Abstract

The utility model relates to the technical field of sensors, and discloses a pressure sensor which comprises an upper shell and a lower shell located below the upper shell, a containing cavity is formed in the upper shell, a pressure sensing module is arranged in the containing cavity, an inlet channel for a medium to enter is formed in the side, adjacent to the lower shell, of the upper shell, and a medium flow channel for the medium to flow is formed in the lower shell. One end of the medium flow channel is communicated with the adjacent port of the inlet channel, and the other end of the medium flow channel faces the pressure sensing module and leads the medium to the pressure sensing module. The present application has the effect of maintaining the stability of the pressure detection function under prescribed conditions.

Description

Technical Field

[0001] This application relates to the field of sensor technology, and in particular to a pressure sensor. Background Technology

[0002] Pressure sensors play a crucial role in modern industrial applications, widely used in industrial automation, aerospace, automotive manufacturing, medical equipment, and environmental monitoring. By converting pressure signals into electrical signals, pressure sensors help us more accurately grasp and control various environmental parameters. Their design incorporates multiple technical elements, such as waterproofing, dustproofing, and electromagnetic shielding, ensuring stable operation under complex and changing working conditions and effectively protecting internal electronic components from external interference. However, with the continuous expansion of application areas and the increasing technical requirements, more challenges are posed to sensor design, especially in specific applications where high adaptability and accuracy are required.

[0003] Traditional pressure sensor designs typically consist of an upper shell, a lower shell, and a media inlet. The upper shell primarily houses and protects key electronic components, such as signal processing circuits, ensuring they are unaffected by external moisture and dust, while also providing good electromagnetic shielding. The lower shell is mainly responsible for mounting the sensor's sensitive components, such as strain gauges or piezoelectric elements, and must ensure these components are in close contact with the measured medium. The media inlet, as the main channel for the medium to enter the sensor, is designed to ensure smooth, bubble-free, and turbulent flow, thereby guaranteeing measurement accuracy. To meet different application conditions, existing technologies have designed various structural configurations, such as upper and lower shells made of different materials, and media inlets of different forms to adapt to various scenario requirements.

[0004] While conventional pressure sensor structures can meet requirements in many situations, existing designs still have significant shortcomings under specific specifications. This is particularly true for some automotive components, where specifications require the medium inlet to be located in the upper housing of the sensor, making traditional designs impossible and limiting their application in this field. Furthermore, the mechanical limitations of traditional sensor structures can lead to poor response time and measurement accuracy in certain application environments. Therefore, there is an urgent need for a novel pressure sensor design that can maintain stable pressure detection functionality under specified conditions. Utility Model Content

[0005] In order to improve the stability of pressure sensor operation under specification constraints, this application provides a pressure sensor.

[0006] The pressure sensor provided in this application adopts the following technical solution:

[0007] A pressure sensor includes an upper shell and a lower shell located below the upper shell. The upper shell has a receiving cavity, and a pressure sensing module is disposed in the receiving cavity. An inlet channel for a medium to enter is provided on the side of the upper shell adjacent to the lower shell. A medium flow channel for the medium to flow is provided in the lower shell. One end of the medium flow channel is connected to a port adjacent to the inlet channel, and the other end faces the pressure sensing module and passes the medium to the pressure sensing module.

[0008] By adopting the above technical solution, the pressure sensing module is placed in the accommodating cavity within the upper housing, and an inlet channel for the medium to enter is provided on the upper housing. A medium flow channel is opened in the lower housing and connected to the inlet channel, allowing the medium to enter from the inlet channel and flow along the medium flow channel to the pressure sensing module, thereby enabling the pressure sensor to accurately detect the medium pressure. This pressure sensor, within specification limitations, improves the response speed of the pressure sensor and effectively enhances its operational stability, enabling the pressure detection function to be used normally in automotive products.

[0009] Optionally, the lower shell has a placement groove on the side facing the upper shell, and an intermediate shell is inserted into the placement groove. The intermediate shell and the placement groove are inserted and fitted together. The intermediate shell has a receiving groove for receiving medium on the side facing the pressure sensing module. The intermediate shell has a first through hole connecting the inlet channel and the medium flow channel inlet on the lower shell, and the receiving groove has a second through hole connecting the medium flow channel outlet on the lower shell.

[0010] By adopting the above technical solution, the intermediate shell and the lower shell are manufactured separately, which facilitates demolding during injection molding and allows for the designated path of the medium. If the intermediate shell and the lower shell were made as a single unit, demolding would be impossible. When the separate intermediate shell and the lower shell are assembled together, the medium can smoothly flow from the inlet channel into the receiving groove inside the intermediate shell through the first and second through holes, and then smoothly flow to the pressure sensing module for detection, thereby improving the flow efficiency and measurement accuracy of the medium channel.

[0011] Optionally, a first sealing groove is coaxially formed on the top wall of the intermediate shell corresponding to the first through hole, and a first sealing ring is inserted into the first sealing groove. The inner ring of the first sealing ring always avoids the channel connecting the first through hole and the inlet channel outlet.

[0012] By adopting the above technical solution, the setting of the first sealing groove and the first sealing ring can ensure that when the intermediate shell is inserted into the placement groove, a reliable seal is formed between the bottom wall of the intermediate shell and the first sealing ring, effectively preventing media leakage and improving the stability of the pressure sensor operation.

[0013] Optionally, a second sealing groove is coaxially formed on the top wall of the intermediate shell corresponding to the second through hole, and a second sealing ring is inserted into the second sealing groove. The inner ring of the second sealing ring always avoids the channel connecting the second through hole and the inlet channel outlet.

[0014] By adopting the above technical solution, the second sealing ring is used to seal when the upper shell and the middle shell come into contact, which can effectively enhance the sealing performance between the middle shell and the inlet channel, prevent media leakage, and further improve the working stability and measurement accuracy of the pressure sensor.

[0015] Optionally, a third sealing groove is coaxially formed on the top wall of the intermediate shell corresponding to the placement groove, and a third sealing ring with an L-shaped cross section is inserted into the third sealing groove, and the third sealing ring is fitted to the bottom wall of the third sealing groove.

[0016] By adopting the above technical solution, the third sealing ring is used to seal the space between the middle shell's receiving groove and the pressure sensing module of the upper shell, effectively preventing the medium from leaking from the receiving groove, further improving the sealing performance between the upper shell and the placement groove, and improving the stability of the sensor under complex working conditions.

[0017] Optionally, the upper shell is provided with a plurality of guide posts, and the lower shell is provided with a plurality of guide holes through which the guide posts slide. The guide posts and guide holes correspond one-to-one. The guide posts are provided with fixing members, which are used to press the lower shell onto the upper shell.

[0018] By adopting the above technical solution, the cooperation between the guide post and the guide through hole not only ensures accurate alignment between the upper and lower shells, but also achieves a stable connection between the lower and upper shells through the fastener, improving the reliability and stability of the overall structure of the pressure sensor and preventing component misalignment or separation caused by external vibration or impact. The fastener is used to press the lower shell firmly onto the upper shell, further enhancing the sensor's durability and protection performance in complex working environments.

[0019] Optionally, the fastener is a hot riveting head disposed at the end of the guide post that protrudes through the guide hole. The guide post is made of a heat-fusible material, and the hot riveting head is made by hot-melting the guide post. The top sidewall of the hot riveting head is abutting against the bottom wall of the lower shell.

[0020] By adopting the above technical solution, the upper and lower shells of the pressure sensor are reliably fixed by guide posts and hot riveting heads, ensuring the structural stability of the sensor in complex application environments and avoiding mechanical loosening problems that may occur with traditional fixing methods, thus further improving the stability of the pressure detection function. Specifically, the contact setting between the hot riveting head and the bottom wall of the lower shell enhances the fastening effect of the fixing components, effectively preventing the sensor assembly from shifting or separating due to vibration or external force, thereby improving the overall reliability and service life of the device.

[0021] In summary, this application includes at least one of the following beneficial technical effects:

[0022] 1. The pressure sensing module is housed in the cavity within the upper casing, with an inlet channel for the medium to enter. A medium flow channel is opened within the lower casing and connected to the inlet channel, allowing the medium to enter through the inlet channel and flow along the medium flow channel to the pressure sensing module, thereby enabling the pressure sensor to accurately detect the medium pressure. This pressure sensor, within specification limitations, improves the response speed and effectively enhances its operational stability, ensuring the pressure detection function can be used normally in automotive products.

[0023] 2. Manufacturing the intermediate shell and lower shell separately facilitates demolding during injection molding and allows for the designated path of the medium. If the intermediate shell and lower shell were made as a single unit, demolding would be impossible. When the separate intermediate shell and lower shell are assembled, the medium can smoothly flow from the inlet channel into the receiving groove inside the intermediate shell through the first and second through holes, and then smoothly flow to the pressure sensing module for detection, thereby improving the flow efficiency and measurement accuracy of the medium.

[0024] 3. The first sealing groove and the first sealing ring are designed to ensure that when the intermediate shell is inserted into the placement groove, a reliable seal is formed between the bottom wall of the intermediate shell and the first sealing ring, which effectively prevents media leakage and improves the stability of the pressure sensor. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0026] Figure 2 This is a cross-sectional view of the overall structure of an embodiment of this application.

[0027] Figure 3 This is an exploded view of an embodiment of this application.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. Upper shell; 11. Receiving cavity; 2. Lower shell; 21. Placement groove; 22. Medium flow channel; 23. Guide through hole; 24. Second sealing groove; 241. Second sealing ring; 25. Limiting slide groove; 3. Pressure sensing module; 4. Inlet channel; 5. Intermediate shell; 51. Receiving groove; 52. First through hole; 53. Second through hole; 54. First sealing groove; 541. First sealing ring; 55. Third sealing groove; 551. Third sealing ring; 6. Guide post; 61. Fixing component; 7. Limiting component; 71. Pressure plate; 72. Elastic connector; 73. Limiting plate; 8. Anti-slip protrusion. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0031] This application discloses a pressure sensor.

[0032] Reference Figure 1 and Figure 2 A pressure sensor includes an upper shell 1 and a lower shell 2, with the lower shell 2 located below the upper shell 1. The upper shell 1 has a receiving cavity 11, within which a pressure sensing module 3 is installed. An inlet channel 4 for media entry is integrally formed on the side of the upper shell 1 adjacent to the lower shell 2. A placement groove 21 is formed on the side of the lower shell 2 facing the upper shell 1, into which an intermediate shell 5 is inserted. The intermediate shell 5 and the placement groove 21 are interlocked. A media flow channel 22 for media flow is also formed within the lower shell 2. A receiving groove 51 for media is formed on the side of the intermediate shell 5 facing the pressure sensing module 3. A first through hole 52 connects the inlet channel 4 to the inlet of the media flow channel 22 on the lower shell 2. A second through hole 53 connects the receiving groove 51 of the intermediate shell 5 to the outlet of the media flow channel 22 on the lower shell 2.

[0033] Reference Figure 2 The medium whose pressure is to be detected enters from the inlet channel 4, passes through the first through hole 52, the medium flow channel 22, and the second through hole 53 in sequence, and finally enters the receiving tank 51, filling the receiving tank 51 and contacting the pressure sensing module 3, thereby accepting the pressure detection of the pressure sensing module 3.

[0034] Reference Figure 3 Multiple guide posts 6 are welded on the upper shell 1. In this embodiment, four guide posts 6 are used as an example. The four guide posts 6 are distributed at the four corners of the bottom wall of the upper shell 1, and the lower shell 2 is provided with guide through holes 23. The guide posts 6 and the guide through holes 23 correspond one-to-one. A fixing member 61 is provided on the guide post 6. In this embodiment, the fixing member 61 is a hot riveting head. The guide post 6 is made of heat-fusible material. The hot riveting head is made by hot-melting the guide post 6. The hot riveting head is located at the end of the guide post 6 that passes through the guide through hole 23, and the top side wall of the hot riveting head is in contact with the bottom wall of the lower shell 2.

[0035] Reference Figure 2 and Figure 3 To improve the sealing of the connection between the upper shell 1, the intermediate shell 5, and the lower shell 2, a first sealing groove 54 is coaxially formed on the top wall of the intermediate shell 5 corresponding to the first through hole 52. A first sealing ring 541 is inserted into the first sealing groove 54, and the inner ring of the first sealing ring 541 always avoids the channel connecting the first through hole 52 and the outlet of the inlet channel 4, and is set to abut against the bottom wall of the upper shell 1. A second sealing groove 24 is formed on the lower shell 2 around the medium flow channel 22, and a second sealing ring 241 is inserted into the second sealing groove 24. The bottom wall of the intermediate shell 5 is set to abut against the second sealing ring 241. A third sealing groove 55 is coaxially formed on the top wall of the intermediate shell 5 corresponding to the placement groove 21. A third sealing ring 551 with an L-shaped cross section is inserted into the third sealing groove 55, and the third sealing ring 551 is set to abut against the bottom wall of the third sealing groove 55.

[0036] The implementation principle of a pressure sensor according to an embodiment of this application is as follows: By optimizing the structural design of the upper shell 1 and the lower shell 2, the solution of this application can realize the setting of the medium inlet in the upper shell 1, thereby adapting to specific specification requirements. The layered structure of the intermediate shell 5 and the multiple sealing design not only ensure the high accuracy and stability of the sensor under different working conditions, but also facilitate demolding after the injection molding of the upper shell 1, intermediate shell 5, and lower shell 2, allowing for the specified path of the medium. This solution has significant advantages in improving the stability of pressure detection function, and is especially suitable for fields with high specification requirements, such as automobile manufacturing.

[0037] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A pressure sensor, characterized in that... It includes an upper shell (1) and a lower shell (2) located below the upper shell (1). The upper shell (1) has a receiving cavity (11) and a pressure sensing module (3) is provided in the receiving cavity (11). An inlet channel (4) for medium to enter is provided on the side of the upper shell (1) adjacent to the lower shell (2). A medium flow channel (22) for medium to flow is provided in the lower shell (2). One end of the medium flow channel (22) is connected to the port adjacent to the inlet channel (4), and the other end faces the pressure sensing module (3) and passes the medium to the pressure sensing module (3).

2. A pressure sensor according to claim 1, characterized in that... The lower shell (2) has a placement groove (21) on the side facing the upper shell (1). An intermediate shell (5) is inserted into the placement groove (21). The intermediate shell (5) and the placement groove (21) are inserted and fitted together. The intermediate shell (5) has a receiving groove (51) for receiving medium on the side facing the pressure sensing module (3). The intermediate shell (5) has a first through hole (52) connecting the inlet channel (4) and the inlet of the medium flow channel (22) on the lower shell (2). The receiving groove (51) and the outlet of the medium flow channel (22) on the lower shell (2) are connected by a second through hole (53).

3. A pressure sensor according to claim 2, characterized in that... The top wall of the intermediate shell (5) is provided with a first sealing groove (54) coaxially with the first through hole (52). A first sealing ring (541) is inserted into the first sealing groove (54). The inner ring of the first sealing ring (541) always avoids the channel connecting the first through hole (52) and the outlet of the inlet channel (4).

4. A pressure sensor according to claim 2, characterized in that... The lower shell (2) is provided with a second sealing groove (24) around the medium flow channel (22). A second sealing ring (241) is inserted into the second sealing groove (24). When the middle shell (5) is inserted into the placement groove (21), the bottom wall of the middle shell (5) and the second sealing ring (241) are in contact.

5. A pressure sensor according to claim 2, characterized in that... The top wall of the intermediate shell (5) is provided with a third sealing groove (55) coaxially with the placement groove (21). A third sealing ring (551) with an L-shaped cross section is inserted into the third sealing groove (55), and the third sealing ring (551) is fitted together with the bottom wall of the third sealing groove (55) and the side wall of the adjacent receiving groove (51).

6. A pressure sensor according to claim 1, characterized in that... The upper shell (1) is provided with a plurality of guide posts (6), and the lower shell (2) is provided with a plurality of guide through holes (23) through which the guide posts (6) slide. The guide posts (6) and the guide through holes (23) correspond one to one. The guide posts (6) are provided with a fixing member (61), which is used to press the lower shell (2) onto the upper shell (1).

7. A pressure sensor according to claim 6, characterized in that... The fixing member (61) is a hot riveting head installed at the end of the guide post (6) through the guide hole (23). The guide post (6) is made of a heat-fusible material. The hot riveting head is made by hot melting the guide post (6). The top side wall of the hot riveting head is in contact with the bottom wall of the lower shell (2).

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