Pressure sensor

Abstract

The utility model provides a pressure sensor, which comprises a shell, a circuit board assembly and a cover body detachably connected with the shell, the shell and the cover body are encircled to form an accommodating space, and the circuit board assembly is arranged in the accommodating space; the circuit board assembly comprises a circuit board and a substrate which is in attached connection with one side plate surface of the circuit board, at least two terminals are arranged on one side of the shell, and each terminal is electrically connected with the circuit board through an elastic conductive piece. The electric connection between the circuit board and the terminal is realized by arranging the elastic conductive piece between the circuit board and the terminal, the mechanical stress generated by the mechanical hard connection mode such as welding in the prior art is effectively avoided, the cost is lower, the operation is more convenient, and the electric connection between the circuit board and the terminal is realized under the condition that the circuit board slightly moves in all directions. And the electric connection between the circuit board and the terminal realized by the elastic conductive piece can still keep stable, so that the normal use of the whole pressure sensor is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of sensors, and particularly relates to a pressure sensor. Background Art

[0002] A pressure sensor is a sensor that can convert the input mechanical pressure in a gas or liquid into an electrical output signal, which can meet the requirements of real-time monitoring and control of the pressure changes of detection media such as gases or liquids, and is widely used in various fields such as vehicles and industrial automation.

[0003] In the existing pressure sensors, the electrical connection between the circuit board and the terminal is generally achieved by mechanical hard connection methods such as welding. However, in actual applications, welding defects such as solder slag and false soldering are likely to occur during the welding process. These welding defects directly affect the stability of the electrical connection between the circuit board and the terminal, thereby affecting the performance of the pressure sensor. In addition, the mechanical hard connection method generates mechanical stress, and the circuit board in the pressure sensor usually undergoes micro-movements in all directions under the action of the pressure change of the detection medium. Under the long-term influence of mechanical stress and micro-movement, the welding part between the circuit board and the terminal is pulled, and it is easy to occur that the welding part breaks or the solder pad falls off, thereby leading to problems such as the failure of the pressure sensor. Summary of the Utility Model

[0004] Based on this, the purpose of the utility model is to provide a pressure sensor, aiming to solve the technical problem that the electrical connection between the circuit board and the terminal in the existing pressure sensor is achieved by mechanical hard connection methods such as welding, and welding defects such as solder slag and false soldering affect the stability of the electrical connection, and under the long-term influence of mechanical stress and micro-movement, the circuit board is prone to breakage of the welding part or falling off of the solder pad, thereby leading to the failure of the pressure sensor.

[0005] The purpose of the utility model is to provide a pressure sensor, which includes a housing, a circuit board assembly, and a cover body detachably connected to the housing. The housing and the cover body enclose a receiving space, and the circuit board assembly is arranged in the receiving space;

[0006] The circuit board assembly includes a circuit board and a substrate attached to one side surface of the circuit board. At least two terminals are arranged on one side of the housing, and each terminal is electrically connected to the circuit board through an elastic conductive member.

[0007] Compared with the prior art, the beneficial effects of the pressure sensor of the present utility model are as follows: By arranging an elastic conductive member between the circuit board and the terminal, the electrical connection between the circuit board and the terminal is realized in a conductive soft connection manner, which can effectively avoid the mechanical stress generated by mechanical hard connection methods such as welding in the prior art, with lower cost, more convenient operation, and when the circuit board undergoes micro-movement in all directions, the electrical connection between the circuit board and the terminal realized by the elastic conductive member can still remain stable, ensuring the normal use of the entire pressure sensor.

[0008] In addition, according to the above-mentioned pressure sensor of the present utility model, the following additional technical features may also be provided:

[0009] Further, at least two accommodation holes are provided on one side of the housing, the accommodation holes are arranged along the height direction of the housing, the elastic conductive member is arranged in the accommodation holes, one end of the terminal is located outside the housing, and the other end of the terminal is located at the bottom of the accommodation hole and abuts against one end of the elastic conductive member.

[0010] Further, the housing is also provided with an installation groove and an annular sealing groove communicated with the installation groove, the installation groove and the accommodation hole are independently arranged, the installation groove is adapted to the substrate, a sealing ring is arranged in the annular sealing groove, when the substrate is located in the installation groove, a part of the board surface on the circuit board is located directly above the accommodation hole and abuts against the other end of the elastic conductive member to realize the electrical connection between the terminal and the circuit board.

[0011] Further, the elastic conductive member is a spring.

[0012] Further, the elastic conductive member is a spring piece.

[0013] Further, the housing is also provided with a first pressure guiding channel and a second pressure guiding channel communicated with the bottom of the first pressure guiding channel, the first pressure guiding channel is located in the middle of the annular sealing groove and communicated with the installation groove, the first pressure guiding channel is arranged along the height direction of the housing, and the other end of the second pressure guiding channel is communicated with the outside of the housing.

[0014] Further, the second pressure guiding channel is inclined, and the end of the second pressure guiding channel communicated with the first pressure guiding channel is lower than the end of the second pressure guiding channel communicated with the outside of the housing.

[0015] Further, a pressure guiding through hole is provided on the substrate, when the substrate is located in the installation groove, the pressure guiding through hole is located directly above the first pressure guiding channel and communicated with the first pressure guiding channel.

[0016] Further, the housing is further provided with two guiding grooves which are arranged along the radial direction of the accommodating hole, and the two guiding grooves are symmetrically arranged on two opposite sides of the mounting groove.

[0017] Further, the cover body includes a cover plate portion and connecting portions symmetrically arranged on two opposite sides of the cover plate portion. The connecting portions are adapted to the guiding grooves, and the detachable connection between the cover body and the housing is realized through the cooperation between the connecting portions and the guiding grooves. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a three-dimensional structure diagram of the pressure sensor in the first embodiment of the present invention;

[0019] Figure 2 is a cross-sectional structure diagram of the pressure sensor in the first embodiment of the present invention;

[0020] Figure 3 is an exploded schematic diagram of the pressure sensor in the first embodiment of the present invention;

[0021] Figure 4 is a structural schematic diagram of the housing in the pressure sensor in the first embodiment of the present invention;

[0022] Figure 5 is a connection schematic diagram of the circuit board and the elastic conductive member in the pressure sensor in the second embodiment of the present invention;

[0023] Figure 6 is another connection schematic diagram of the circuit board and the elastic conductive member in the pressure sensor in the second embodiment of the present invention;

[0024] Among them, the above-mentioned drawings include the following reference numerals: 10 - housing; 11 - accommodating hole; 12 - mounting groove; 13 - annular sealing groove; 14 - guiding groove; 101 - first pressure guiding channel; 102 - second pressure guiding channel; 20 - circuit board assembly; 21 - circuit board; 22 - substrate; 221 - pressure guiding through hole; 30 - terminal; 40 - elastic conductive member; 50 - cover body; 51 - cover plate portion; 52 - connecting portion; 60 - sealing ring.

[0025] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] For the convenience of understanding the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present invention more thorough and comprehensive.

[0027] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this utility model belongs. The terms used herein in the specification of this utility model are only for the purpose of describing specific embodiments and are not intended to limit this utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0029] Embodiment 1

[0030] Please refer to Figures 1 to 4 , which shows a pressure sensor in the first embodiment of the present utility model, including a housing 10, a circuit board assembly 20, and a cover 50 detachably connected to the housing 10. The housing 10 and the cover 50 enclose an accommodation space, and the circuit board assembly 20 is disposed in the accommodation space; the circuit board assembly 20 includes a circuit board 21 and a substrate 22 attached to one side surface of the circuit board 21. At least two terminals 30 are provided on one side of the housing 10, and each terminal 30 is electrically connected to the circuit board 21 through an elastic conductive member 40.

[0031] Furthermore, at least two accommodation holes 11 are provided on one side of the housing 10. The accommodation holes 11 are arranged along the height direction of the housing 10. The elastic conductive member 40 is disposed in the accommodation holes 11. One end of the terminal 30 is located outside the housing 10, and the other end of the terminal 30 is located at the bottom of the accommodation hole 11 and abuts against one end of the elastic conductive member 40. As a specific example, in this embodiment, three accommodation holes 11 are provided at intervals on one side of the housing 10. The elastic conductive member 40 is a spring, and the accommodation holes 11 are circular holes adapted to the shape of the spring. One end of each terminal 30 is respectively provided at the bottom of each accommodation hole 11. It should be understood that the end of the terminal 30 located in the accommodation hole 11 is a circular plate structure, and this circular plate structure can completely cover the bottom of the accommodation hole 11, thereby ensuring the abutment between the terminal 30 and the spring.

[0032] Furthermore, the housing 10 is further provided with a mounting groove 12 and an annular sealing groove 13 communicating with the mounting groove 12. The mounting groove 12 is independently arranged from the accommodating hole 11. The mounting groove 12 is adapted to the substrate 22. A sealing ring 60 is arranged in the annular sealing groove 13. When the substrate 22 is located in the mounting groove 12, a part of the board surface on the circuit board 21 is located directly above the accommodating hole 11 and abuts against the other end of the elastic conductive member 40, so as to realize the electrical connection between the terminal 30 and the circuit board 21. As a specific example, in this embodiment, the substrate 22 is a ceramic substrate with a cube structure, and the mounting groove 12 is a square groove structure adapted to the substrate 22. An annular sealing groove 13 is arranged in the square groove. When the substrate 22 is located in the mounting groove 12, the lower board surface of the substrate 22 closely abuts against the sealing ring 60, which can play a role in sealing the detection medium and prevent the detection medium from escaping to other parts inside the housing 10 and affecting the pressure measurement performance. The board surface of the circuit board 21 abuts against the inner wall of the housing 10. At the same time, the conductive part on the circuit board 21 is located directly above the accommodating hole 11 and abuts against the other end of the spring. It should be noted that when the two ends of the spring respectively abut against the terminal 30 and the circuit board 21, the spring itself is in a compressed state. In this way, it can not only play a role in supporting the circuit board 21, but also realize the electrical connection between the terminal 30 and the circuit board 21 in an elastic connection manner, so that when the circuit board 21 undergoes micro-movement in all directions, the electrical connection between the terminal 30 and the circuit board 21 still remains stable, thereby ensuring the normal use of the entire pressure sensor.

[0033] Furthermore, the housing 10 is further provided with a first pressure guiding channel 101 and a second pressure guiding channel 102 communicating with the bottom of the first pressure guiding channel 101. The first pressure guiding channel 101 is located in the middle of the annular sealing groove 13 and communicates with the mounting groove 12. The first pressure guiding channel 101 is arranged along the height direction of the housing 10, and the other end of the second pressure guiding channel 102 communicates with the outside of the housing 10.

[0034] Furthermore, the second pressure guiding channel 102 is inclined, and the end of the second pressure guiding channel 102 communicating with the first pressure guiding channel 101 is lower than the end of the second pressure guiding channel 102 communicating with the outside of the housing 10. It should be noted that the inclined structure of the second pressure guiding channel 102 can play a role in guiding the detection medium into the bottom of the first pressure guiding channel 101, thereby facilitating the pressure detection of the detection medium.

[0035] Furthermore, a pressure guiding through hole 221 is arranged on the substrate 22. When the substrate 22 is located in the mounting groove 12, the pressure guiding through hole 221 is located directly above the first pressure guiding channel 101 and communicates with the first pressure guiding channel 101.

[0036] Further, to improve the assembly convenience between the cover body 50 and the housing 10, the housing 10 is further provided with two guiding grooves 14 which are arranged along the radial direction of the accommodating hole 11, and the two guiding grooves 14 are symmetrically arranged on two opposite sides of the mounting groove 12. The cover body 50 includes a cover plate portion 51 and connecting portions 52 symmetrically arranged on two opposite sides of the cover plate portion 51. The connecting portions 52 are adapted to the guiding grooves 14, and the detachable connection between the cover body 50 and the housing 10 is realized through the cooperation between the connecting portions 52 and the guiding grooves 14.

[0037] In summary, the beneficial effects of the pressure sensor of the present utility model are as follows: By arranging the elastic conductive member 40 between the circuit board 21 and the terminal 30, the electrical connection between the circuit board 21 and the terminal 30 is realized in a conductive soft connection manner, which can effectively avoid the mechanical stress generated by the mechanical hard connection methods such as welding in the prior art, with lower cost and more convenient operation. Moreover, when the circuit board 21 undergoes micro-movement in all directions, the electrical connection between the circuit board 21 and the terminal 30 realized by the elastic conductive member 40 can still remain stable, ensuring the normal use of the entire pressure sensor.

[0038] Embodiment 2

[0039] Please refer to Figure 5 and Figure 6 As shown, the pressure sensor in the second embodiment of the present utility model is different from the pressure sensor in the first embodiment in that: the elastic conductive member 40 is a spring piece, and the accommodating hole 11 is correspondingly set to a shape adapted to the structure of the spring piece to realize the accommodation of the spring piece. It should be noted that Figure 4 and Figure 5 As shown, there are two different structural shapes of the spring piece in this embodiment, but the structure of the spring piece is not limited to the structural shapes shown in this embodiment, and can also be other structural shapes that can achieve the purpose of the present utility model.

[0040] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0041] The above-described embodiments merely represent several implementation manners of the present utility model. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the present utility model application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several variations and improvements can still be made, and these all fall within the protection scope of the present utility model. Therefore, the protection scope of the present utility model application shall be subject to the appended claims.

Claims

1. A pressure sensor, characterized in that, It includes a housing, a circuit board assembly, and a cover detachably connected to the housing. The housing and the cover enclose a receiving space, and the circuit board assembly is disposed in the receiving space. The circuit board assembly includes a circuit board and a substrate adhesively connected to one side surface of the circuit board. At least two terminals are provided on one side of the housing, and each terminal is electrically connected to the circuit board through an elastic conductive member.

2. The pressure sensor according to claim 1, wherein At least two accommodation holes are provided on one side of the housing. The accommodation holes are arranged along the height direction of the housing. The elastic conductive members are disposed in the accommodation holes. One end of the terminal is located outside the housing, and the other end of the terminal is located at the bottom of the accommodation hole and abuts against one end of the elastic conductive member.

3. The pressure sensor according to claim 2, wherein, The housing further has a mounting groove and an annular sealing groove communicating with the mounting groove. The mounting groove and the accommodation hole are independently arranged. The mounting groove is adapted to the substrate. A sealing ring is disposed in the annular sealing groove. When the substrate is located in the mounting groove, a partial surface of the circuit board is located directly above the accommodation hole and abuts against the other end of the elastic conductive member to realize the electrical connection between the terminal and the circuit board.

4. The pressure sensor according to claim 1, characterized in that, The elastic conductive member is a spring.

5. The pressure sensor according to claim 1, characterized in that, The elastic conductive member is a shrapnel.

6. The pressure sensor according to claim 3, characterized in that, The housing further has a first pressure guiding channel and a second pressure guiding channel communicating with the bottom of the first pressure guiding channel. The first pressure guiding channel is located in the middle of the annular sealing groove and communicates with the mounting groove. The first pressure guiding channel is arranged along the height direction of the housing. The other end of the second pressure guiding channel communicates with the outside of the housing.

7. The pressure sensor according to claim 6, characterized in that, The second pressure guiding channel is inclined, and the end of the second pressure guiding channel communicating with the first pressure guiding channel is lower than the end of the second pressure guiding channel communicating with the outside of the housing.

8. The pressure sensor according to claim 6, wherein A pressure guiding through hole is provided on the substrate. When the substrate is located in the mounting groove, the pressure guiding through hole is located directly above the first pressure guiding channel and communicates with the first pressure guiding channel.

9. The pressure sensor according to claim 3, wherein The housing further has two guiding grooves. The guiding grooves are arranged along the radial direction of the accommodation hole, and the two guiding grooves are symmetrically arranged on two opposite sides of the mounting groove.

10. The pressure sensor according to claim 9, characterized in that, The cover includes a cover plate portion and connecting portions symmetrically arranged on two opposite sides of the cover plate portion. The connecting portions are adapted to the guiding grooves, and the detachable connection between the cover and the housing is realized through the cooperation between the connecting portions and the guiding grooves.

Images