CN217304219U

CN217304219U - Film pressure sensor

Info

Publication number: CN217304219U
Application number: CN202220939395.1U
Authority: CN
Inventors: 郝东; 浦广益; 王枫
Original assignee: Wuxi Shangheda Intelligent Technology Co ltd
Current assignee: Wuxi Shangheda Intelligent Technology Co ltd
Priority date: 2022-04-22
Filing date: 2022-04-22
Publication date: 2022-08-26
Anticipated expiration: 2032-04-22

Abstract

The utility model 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 the 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 load to transship the destruction phenomenon of the whole shearing that leads to, the measuring reliability of integrated device under extreme operating mode has been improved.

Description

Film pressure sensor

Technical Field

The utility model relates to a pressure sensor field, in particular to 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 the 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.

SUMMERY OF THE UTILITY MODEL

Utility model purpose: the utility model aims at providing a film pressure sensor can reduce because the unbalanced measurement accuracy's that leads to of atress error, can avoid the load to transship the destruction condition of the whole shearing that leads to simultaneously, has improved the reliability in the face of measurement accuracy under extreme operating mode.

The technical scheme is as follows: the utility model 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, the first cavity and the cylindrical metal block bulge are concentric; the second cavity is separated from the first cavity by 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 protrusion of the cylindrical metal block.

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 symmetry all around of convex bellied clamp plate when having the skew, guarantees that the load still produces the 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 first cavity 3 is provided with clamp plate 6, clamp plate 6 top is convex arch, clamp plate 6 bottom is provided with the same cylindrical metal block 8 with 3 diameters of first cavity, the protrusion height of cylindrical metal block 8 is 2mm, with interference connection between the inner wall of first cavity 3, fix a position clamp plate 6 in body 1 top through cylindrical metal block 8, bear load, the convex arch at clamp plate 6 top can guarantee that external load still produces the internal force moment of flexure at the middle part and the pressure distribution that helps the load transmission is more even, finally improve measurement accuracy.

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 pressure plate is installed on a vehicle, the second cavity 4 and a positioning block on the vehicle are positioned and installed, the load of the vehicle is connected with the arc-shaped protrusion 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 protrusion 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 thin 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.

Claims

1. A film pressure sensor, including body (1), its characterized in that: the metal block type heat exchanger comprises a body (1), a cylindrical metal block protrusion (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 protrusion (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 protrusion (2) are concentric; the second cavity (4) is separated from the first cavity (3) through 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 membrane pressure sensor of 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 according to 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).