CN217304121U - Annular integrated pressure sensor - Google Patents
Annular integrated pressure sensor Download PDFInfo
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- CN217304121U CN217304121U CN202221063378.2U CN202221063378U CN217304121U CN 217304121 U CN217304121 U CN 217304121U CN 202221063378 U CN202221063378 U CN 202221063378U CN 217304121 U CN217304121 U CN 217304121U
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Abstract
The utility model discloses a ring shape integral type pressure sensor, including the metal body, the center of metal body is provided with cylindrical boss, the outside of cylindrical boss is provided with the annular groove, the inside of cylindrical boss is provided with cylindrical cavity, the bottom of cylindrical cavity is provided with the sheet metal with cylindrical cavity confined, evenly be provided with on the inner wall of cylindrical cavity and be no less than four foil gages, the influence of uncertainty between each part in traditional assembled structure has been avoided through the structure of integration to this application; meanwhile, the influence on the strain gauge in stress connection caused by too small size and height can be reduced, the phenomenon of overall 'shearing' damage caused by overlarge external load is avoided, and the sensor can also work normally under the extreme working condition of the vehicle.
Description
Technical Field
The utility model relates to a pressure sensor field, in particular to ring shape integral type pressure sensor.
Background
The current vehicle-mounted weighing sensor scheme mainly comprises a weighing pressure sensor and a deformation displacement sensor.
The existing weighing pressure sensors mainly comprise cantilever beam weighing sensors, spoke type pressure sensors, S-shaped tension and compression sensors, tension sensors, micro sensors, diaphragm box type sensors, column type sensors, hanging type sensors, multi-dimensional force sensors, static torque sensors, dynamic torque sensors and the like, the sensors are used in the engineering field of various industries, the measured data and the precision of various applications are different, and a certain product needs to be selected according to requirements.
In the application field of the vehicle-mounted weighing system, the conventional weighing pressure sensor products listed above cannot be applied to the specific engineering application due to the factors of narrow installation space, frequent vibration impact, large pretightening force and the like. The too big unable installation of wide range pressure sensor size consequently can only adopt the less sensor of size, and traditional small-size sensor mostly adopts assembled structure, receives the uncertain influence between each part easily, detects the precision simultaneously not high, and the performance is stable inadequately, consequently to these problems, this application has proposed a solution.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: the utility model aims at providing a circle ring type integral type pressure sensor, simple structure, the stable performance, the installation is simple and easy, can reduce because the too little influence to the foil gage in the stress that arouses of size height, avoids the too big phenomenon that leads to the fact whole "shearing" to destroy of external load, ensures that the vehicle sensor also can normally work under extreme operating mode.
The technical scheme is as follows: a circle ring style integral type pressure sensor, including the metal body, its characterized in that: the center of metal body is provided with cylindrical boss, the outside of cylindrical boss is provided with annular groove, the inside of cylindrical boss is provided with cylindrical cavity, the bottom of cylindrical cavity is provided with cylindrical cavity confined sheet metal, evenly is provided with on the inner wall of cylindrical cavity and is no less than four foil gage.
Preferably, the cylindrical boss is higher than the metal body by a height of 1-2 mm.
The cylindrical boss is higher than the metal body, so that stress concentration on the cylindrical boss can be ensured, other parts of the metal body cannot be damaged, the detection precision cannot be influenced, the overall miniaturization can be ensured by setting the height between 1 mm and 2mm, and the installation on a vehicle is facilitated.
Preferably, the groove depth of the circular ring-shaped groove is not less than 10 mm.
The groove depth is not less than 10mm, so that the stress change detected by the strain gauge arranged on the inner wall of the cylindrical cavity can be more accurate.
Preferably, the height of the strain gauge is not lower than the bottom of the circular groove.
The height of the strain gauge is not lower than the bottom of the circular groove, so that the stress precision detected by the strain gauge is higher when an external force acts on the cylindrical boss.
Preferably, the side wall of the metal body is provided with a through hole for placing a line for connecting the strain gauge, and the through hole is lower than the bottom of the circular groove.
The arrangement of the through holes is used for protecting the transmission signal lines on the one hand, and the positions of the through holes on the other hand can avoid influencing stress changes.
Preferably, the metal body is formed integrally.
The integrated structure can avoid the influence of uncertainty among parts in the traditional assembled structure.
Has the advantages that:
(1) the influence of uncertainty among parts in the traditional assembly type structure is avoided through the integrally formed structure;
(2) in the application, the external force completely acts on the cylindrical boss, so that the measuring accuracy is ensured;
(3) in the application, the center of the resultant force of the external force is at the central axis, the inner wall of the cylindrical cavity has compressive stress, and the strain gauge is attached to the inner wall of the cylindrical cavity and has secondary pressure-strain superposition, so that the strain is increased, the output signal is enhanced, and the measured value is more accurate;
(4) when the center of the resultant force of the external force is not completely positioned at the central axis, a bias phenomenon is generated, but the bias forms another bending moment, one end of the strain generated at the inner side wall is necessarily pressed, and the other end is necessarily pulled, and the function of mutually offsetting the electric bridges in the traditional circuit is adopted, so that the bias resistance of the sensor is improved;
(5) the structure of the sensor can reduce the influence of stress concentration caused by too thin dimension height on the position where the strain gauge is attached, namely, the edge effect caused by the structure is reduced, and the sensor is favorable for stable performance;
(6) the structure of this application can avoid because external load is too big when the vehicle receives the impact, causes the destruction phenomenon of whole "shearing", has guaranteed that the vehicle also can normally work under extreme operating mode.
Drawings
FIG. 1 is a side sectional view of the present application;
fig. 2 is a perspective view of the present application.
Detailed Description
The present application is further illustrated with reference to specific examples below.
As shown in fig. 1-2, which is a schematic structural diagram of the present application, the present application includes a metal body 1, a cylindrical boss 2 is disposed at the center of the metal body 1, a circular groove 3 is disposed on the outer side of the cylindrical boss 2, a cylindrical cavity 4 is disposed inside the cylindrical boss 2, a metal sheet 5 for sealing the cylindrical cavity 4 is disposed at the bottom of the cylindrical cavity 4, and four strain gauges 6 are uniformly disposed on the inner wall of the cylindrical cavity 4.
In this embodiment, the height that cylindrical boss 2 is higher than metal body 1 is 1.5mm, ensures that stress concentration is on cylindrical boss 2, can not cause destruction to other parts of metal body 1, also can not influence the precision that detects simultaneously to can not destroy holistic miniaturization, be convenient for install on the vehicle.
In this embodiment, the groove depth of ring shape recess 3 is 10mm, ensures that the stress change that strain gage 6 that sets up on cylindrical cavity 4 inner wall detected is more accurate, and the height that strain gage 6 set up is not less than ring shape recess 3's bottom simultaneously, when ensuring that the external force acts on cylindrical boss 2, the stress precision that strain gage 6 detected is higher.
In this embodiment, the side wall of the metal body 1 is provided with a through hole 7 for placing a line connected with the strain gauge 6, the through hole 7 is lower than the bottom of the circular groove 3, on one hand, the line for transmitting signals can be protected, and on the other hand, the position of the through hole 7 can avoid influencing the stress variation.
In the present embodiment, the metal body 1 is an integrally formed structure, so as to avoid the influence of uncertainty between each component in the conventional assembly structure.
In the working process of the embodiment, external force is completely acted on the cylindrical boss 2, the strain gauge 6 is arranged on the inner wall of the cylindrical cavity 4, and the strain value of the strain gauge 6 is superposed by three parts of strain:
(1) the external force directly acts on the cylindrical boss 2, and the strain is caused by the direct action of the external force;
(2) the resultant force center of the external force is at the central axis of the cylindrical boss 2, the external force can generate an internal force bending moment on the inner wall, the bending moment is compressive stress at the inner wall, tensile stress at the outer wall, and secondary compressive strain superposition is realized because the strain gauge is attached to the inner side;
(3) when the resultant force of the external force is not completely in the central axis of the cylindrical boss 2, a bias phenomenon is generated, the bias forms another bending moment, one end of the strain generated in the inner wall is certainly pressed, and the other end is certainly pulled, and the two ends are mutually offset through an electric bridge in the circuit.
The structural characteristics ensure that when the sensor works, on one hand, when the resultant force of the external force is completely in the central axis of the cylindrical boss, the strain is increased, so that the output signal is increased, the detection precision is higher, and on the other hand, when the resultant force of the external force is not completely in the central axis of the cylindrical boss, the function of mutual offset of the electric bridges in the circuit is utilized, and the integral anti-bias performance of the sensor is improved.
Claims (6)
1. The utility model provides a ring shape integral type pressure sensor, includes metal body (1), its characterized in that: the center of metal body (1) is provided with cylindrical boss (2), the outside of cylindrical boss (2) is provided with annular groove (3), the inside of cylindrical boss (2) is provided with cylindrical cavity (4), the bottom of cylindrical cavity (4) is provided with cylindrical cavity (4) confined sheet metal (5), evenly is provided with on the inner wall of cylindrical cavity (4) and is no less than four foil gauges (6).
2. The annular integrated pressure sensor according to claim 1, wherein: the cylindrical boss (2) is higher than the metal body (1) by 1-2 mm.
3. The annular integrated pressure sensor according to claim 1, wherein: the groove depth of the circular groove (3) is not less than 10 mm.
4. The annular integrated pressure sensor according to claim 1, wherein: the height of the strain gauge (6) is not lower than the bottom of the circular groove (3).
5. The annular integrated pressure sensor according to claim 1, wherein: the side wall of the metal body (1) is provided with a through hole (7) used for placing a line connected with the strain gauge (6), and the through hole (7) is lower than the bottom of the circular groove (3).
6. The annular integrated pressure sensor according to claim 1, wherein: the metal body (1) is of an integrally formed structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221063378.2U CN217304121U (en) | 2022-05-06 | 2022-05-06 | Annular integrated pressure sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221063378.2U CN217304121U (en) | 2022-05-06 | 2022-05-06 | Annular integrated pressure sensor |
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| Publication Number | Publication Date |
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| CN217304121U true CN217304121U (en) | 2022-08-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221063378.2U Active CN217304121U (en) | 2022-05-06 | 2022-05-06 | Annular integrated pressure sensor |
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| CN (1) | CN217304121U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115717952A (en) * | 2022-11-07 | 2023-02-28 | 清华大学 | Pressure sensor and pressure device |
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2022
- 2022-05-06 CN CN202221063378.2U patent/CN217304121U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115717952A (en) * | 2022-11-07 | 2023-02-28 | 清华大学 | Pressure sensor and pressure device |
| CN115717952B (en) * | 2022-11-07 | 2024-08-13 | 清华大学 | Pressure sensor and pressure device |
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