CN114689227A - Film pressure sensor - Google Patents
Film pressure sensor Download PDFInfo
- Publication number
- CN114689227A CN114689227A CN202210427171.7A CN202210427171A CN114689227A CN 114689227 A CN114689227 A CN 114689227A CN 202210427171 A CN202210427171 A CN 202210427171A CN 114689227 A CN114689227 A CN 114689227A
- Authority
- CN
- China
- Prior art keywords
- cavity
- metal block
- film
- cylindrical metal
- pressure sensor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
- G01L1/2206—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports
- G01L1/2231—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports the supports being disc- or ring-shaped, adapted for measuring a force along a single direction
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/14—Measuring force or stress, in general by measuring variations in capacitance or inductance of electrical elements, e.g. by measuring variations of frequency of electrical oscillators
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Force In General (AREA)
Abstract
The invention discloses a film pressure sensor, which comprises a body, wherein the body is a metal block, a cylindrical metal block bulge is arranged at the center of the top of the body, a cylindrical first cavity is arranged at the center of the cylindrical metal block bulge, a cylindrical second cavity is arranged at the bottom of the body, and the second cavity is separated from a first space by a film; a pressing plate is arranged at the top of the first cavity; evenly distributed has resistance strain gauge on the anchor ring that the second cavity top surpassed first cavity, thereby this application arouses first cavity through the clamp plate to warp and makes the film warp, do not have other external force direct action on the film, resistance strain gauge measuring precision has been guaranteed, and with resistance strain gauge setting on the anchor ring that the second cavity top surpassed first cavity, can avoid the destruction phenomenon of the whole shearing that the load overload leads to, the reliability of whole device measurement under extreme operating mode has been improved.
Description
Technical Field
The invention relates to the field of pressure sensors, in particular to a film 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 wide-range pressure sensor is too large to be installed; the sensor with smaller size has too small measuring range and can not meet the requirement of bearing capacity required in the field of vehicle-mounted weighing application.
The deformation displacement sensor detects the micro-deformation or displacement of the frame or the axle and converts the micro-deformation or displacement into weight through an algorithm, and the defect is that the material characteristics of the frame or the axle are uncertain, so that the acquired micro-deformation or displacement is uncontrollable, the precision is low, and the error is large.
Simultaneously in current on-vehicle weighing sensor scheme, there is the problem mostly in the face of the performance of vehicle load under the limit condition, the destruction that whole shearing force that leads to when unable avoiding the vehicle to transship brought sensor self to influence the precision that the vehicle was weighed, consequently to these problems, a solution has been proposed in this application.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a film pressure sensor, which can reduce the error of measurement accuracy caused by unbalanced stress, avoid the damage condition of integral shearing caused by overload of load and improve the reliability of measurement accuracy under the condition of facing extreme working conditions.
The technical scheme is as follows: the invention relates to a film pressure sensor which comprises a body, wherein the body is a metal block, a cylindrical metal block bulge is arranged at the center of the top of the body, a cylindrical first cavity is arranged at the center of the cylindrical metal block bulge, a cylindrical second cavity is arranged at the bottom of the body, and the second cavity, the first cavity and the cylindrical metal block bulge are concentric; the second cavity is separated from the first space through a film; a pressing plate is arranged at the top of the first cavity; resistance strain gauges are uniformly distributed on the circular ring surface of the top of the second cavity, which exceeds the first cavity.
Preferably, the diameter of the second cavity is larger than that of the first cavity, and the diameter of the second cavity is smaller than that of the cylindrical metal block protrusion.
The diameter of the second cavity is larger than that of the first cavity and smaller than that of the cylindrical metal block protrusion, so that stress of the first cavity can be ensured to be smaller than that of the second cavity, bending moment applied to the film is more obvious, and detection accuracy of the resistance strain gauge is further improved.
Preferably, the bottom of the pressure plate is provided with a cylindrical metal block with the same diameter as the first cavity, and the top of the pressure plate is provided with an arc-shaped bulge.
The cylindrical metal block can position the pressing plate, the arc-shaped bulge at the top of the pressing plate can ensure the center of an external force load and is beneficial to more uniform pressure distribution of load transmission, and finally, the measurement precision is improved
Preferably, the protruding height of the cylindrical metal block is not more than 2mm, and the cylindrical metal block is in interference connection with the inner wall of the first cavity.
The interference connection ensures that the pressure plate can be securely positioned over the body to carry the load.
Preferably, the thickness of the film is between 0.2 and 1 mm.
The thickness of the film is 0.2 to 1mm, so that the wide range of the applicable load range can be directly ensured.
Preferably, a circuit board electrically connected with the resistance strain gauge is arranged in the second cavity, and the circuit board transmits signals outwards through wires arranged in through holes in the side face of the body.
Has the advantages that:
(1) the load acts on the pressing plate, so that the first cavity deforms to deform the film, other external force does not directly act on the film, and the measuring precision of the resistance strain gauge is guaranteed.
(2) This application guarantees through convex bellied clamp plate that the external force position that receives because the convex bellied clamp plate of circle symmetry all around when having the skew, guarantees that the load still produces internal force moment of flexure in the middle part, can not influence pressure measurement's precision yet.
(3) This application is through setting up resistance strain gauge on the torus that surpasss first cavity at second cavity top, can avoid the load to transship the destruction phenomenon of the whole shearing that leads to, has improved the reliability that whole device measured under extreme operating mode.
Drawings
FIG. 1 is a side cross-sectional view of a platen in the present application;
FIG. 2 is a side cross-sectional view of the body of the present application;
fig. 3 is a top view of the present application.
Detailed Description
The present application is further illustrated with reference to specific examples below.
As shown in fig. 1-3, which are structural schematic diagrams of the present application, in this embodiment, the body 1 is a metal block, the center of the top of the body 1 is provided with a cylindrical metal block protrusion 2, the center of the cylindrical metal block protrusion 2 is provided with a cylindrical first cavity 3, the bottom of the body 1 is provided with a cylindrical second cavity 4, the first cavity 3, the second cavity 4 and the cylindrical metal block protrusion 2 are concentric, a film 5 with a thickness of 0.6mm is arranged between the first cavity 3 and the second cavity 4, and resistance strain gauges 7 are uniformly distributed on a circular ring surface of the top of the second cavity 4 exceeding the first cavity 3.
In the embodiment, the diameter of the second cavity 4 is larger than that of the first cavity 3 and smaller than that of the cylindrical metal block protrusion 2, and the arrangement can ensure that the stress of the first cavity 3 is smaller than that of the second cavity 4, so that the bending moment applied to the film 5 is more obvious, and the detection accuracy of the resistance strain gauge 7 is further improved.
In this embodiment, the top of the first cavity 3 is provided with the pressing plate 6, the top of the pressing plate 6 is a circular arc-shaped protrusion, the bottom of the pressing plate 6 is provided with a cylindrical metal block 8 with the same diameter as the first cavity 3, the protruding height of the cylindrical metal block 8 is 2mm, the circular arc-shaped protrusion is in interference connection with the inner wall of the first cavity 3, the pressing plate 6 is positioned above the body 1 through the cylindrical metal block 8, load bearing is achieved, the circular arc-shaped protrusion at the top of the pressing plate 6 can ensure that external load still generates internal force bending moment in the middle and pressure distribution which is helpful for load transmission is more uniform, and finally measurement accuracy is improved.
In this embodiment, a circuit board electrically connected to the resistance strain gauge 7 is provided in the second cavity 4, and the circuit board transmits signals to the outside through wires provided in the through holes 9 in the side surface of the body 1.
When the automobile pressure sensor is installed on an automobile, the second cavity 4 is located and installed on a locating block on the automobile, the automobile load is connected with the arc-shaped bulge on the top of the pressure plate 6, the load applies pressure to the pressure plate 6, due to the peripheral symmetry of the arc-shaped bulge of the pressure plate 6, an internal force bending moment is generated in the middle of the pressure plate 6, the internal force bending moment causes the first cavity to deform 3, so that the film 5 deforms, so that the resistance strain gauge 7 generates strain, and a pressure signal is generated.
Only there is the deformation of first cavity 3 in this application to lead to film 5 to warp, there is not other external force direct action on film 5, the measuring precision of resistance strain gauge 7 has been guaranteed, convex bellied clamp plate 6 guarantees that the external force position that receives can not influence pressure measurement's precision when having the skew, and set up resistance strain gauge 7 on the torus that second cavity 4 top surpassed first cavity 3, can avoid the destruction phenomenon of the whole shearing that the load overload leads to, the reliability of measuring under extreme operating mode of integrated device has been improved.
Finally, it should be noted that: the described embodiments are only some embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Claims (6)
1. A film pressure sensor, including body (1), its characterized in that: the body (1) is a metal block, a cylindrical metal block bulge (2) is arranged in the center of the top of the body (1), a cylindrical first cavity (3) is arranged in the center of the cylindrical metal block bulge (2), a cylindrical second cavity (4) is arranged at the bottom of the body (1), and the second cavity (4), the first cavity (3) and the cylindrical metal block bulge (2) are concentric; the second cavity (4) is separated from the first space (3) by a thin film (5); a pressing plate (6) is arranged at the top of the first cavity (3); and resistance strain gauges (7) are uniformly distributed on the circular ring surface of the top of the second cavity (4) exceeding the first cavity (3).
2. The membrane pressure sensor of claim 1, wherein: the diameter of the second cavity (4) is larger than that of the first cavity (3), and the diameter of the second cavity (4) is smaller than that of the cylindrical metal block bulge (2).
3. The film pressure sensor according to claim 1, wherein: the bottom of the pressing plate (6) is provided with a cylindrical metal block (8) with the same diameter as the first cavity (3), and the top of the pressing plate (6) is a circular arc-shaped bulge.
4. A membrane pressure sensor as in claim 3, wherein: the protruding height of the cylindrical metal block (8) is not more than 2mm, and the cylindrical metal block is in interference connection with the inner wall of the first cavity (3).
5. The membrane pressure sensor of claim 1, wherein: the thickness of the film (5) is between 0.2 and 1 mm.
6. The membrane pressure sensor of claim 1, wherein: and a circuit board electrically connected with the resistance strain gauge (7) is arranged in the second cavity (4), and the circuit board transmits signals outwards through wires arranged in the through holes (9) on the side surface of the body (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210427171.7A CN114689227A (en) | 2022-04-22 | 2022-04-22 | Film pressure sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210427171.7A CN114689227A (en) | 2022-04-22 | 2022-04-22 | Film pressure sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114689227A true CN114689227A (en) | 2022-07-01 |
Family
ID=82144864
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210427171.7A Pending CN114689227A (en) | 2022-04-22 | 2022-04-22 | Film pressure sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114689227A (en) |
-
2022
- 2022-04-22 CN CN202210427171.7A patent/CN114689227A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3065291B2 (en) | Force sensor | |
| US5915281A (en) | Silicon force and displacement sensor | |
| JPS6135322A (en) | Multi-axial load transducer device | |
| US3139598A (en) | Electrical pressure transducer | |
| CN217304219U (en) | Film pressure sensor | |
| CN217304121U (en) | Annular integrated pressure sensor | |
| CN114689227A (en) | Film pressure sensor | |
| US3277718A (en) | Electrical pressure transducer | |
| CN117553945A (en) | Force sensor and force sensor | |
| CN218239137U (en) | Single-axis force sensor | |
| CN210735377U (en) | Belt deviation detection device | |
| CN211904496U (en) | Combined type high-voltage sensor with high sensitivity | |
| CN217878101U (en) | Differential film type wide-range pressure sensor | |
| US3537318A (en) | Transducer overload protection means | |
| CN217384515U (en) | Integral column type wide-range pressure sensor | |
| EP0762130A1 (en) | Acceleration sensor | |
| CN216925768U (en) | Pressure sensor for weighing vehicle | |
| CN216695233U (en) | Weighing pressure sensor applied to vehicle | |
| CN220153775U (en) | Film differential type wide-range pressure sensor | |
| JP2004279080A (en) | Load sensor | |
| CN211717572U (en) | Force sensor | |
| CN219244852U (en) | Static torsion sensor with overload protection structure | |
| CN219284532U (en) | Single-axis pressure sensor | |
| CN209745222U (en) | Resistance strain type micro-strain sensor | |
| CN114370916B (en) | Spoke type weighing sensor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |