CN217878101U

CN217878101U - Differential film type wide-range pressure sensor

Info

Publication number: CN217878101U
Application number: CN202222054350.9U
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: 2022-08-05
Filing date: 2022-08-05
Publication date: 2022-11-22
Anticipated expiration: 2032-08-05

Abstract

The utility model discloses a difference formula film type wide range pressure sensor, including the massive body of metal, be provided with endocentric first cavity and second cavity in the body respectively from top to bottom, separate through the film between first cavity and the second cavity, the film is provided with the arch at the terminal surface center that is located second cavity one side, the juncture of stating arch and film is provided with a plurality of foil gauges, a plurality of foil gauges constitute full bridge circuit and be connected with external circuit board, this application is through setting up the arch on the film, thereby form film thickness's differentiation, through set up the foil gauge in film thickness change department and make the more clear sudden change of stress that detects of foil gauge, thereby improve the holistic detection precision of sensor.

Description

Differential film type wide-range pressure sensor

Technical Field

The utility model relates to a pressure sensor field, in particular to difference formula film type wide range 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.

In view of the above problems, the applicant patented: a thin film pressure sensor, application No.: 202220939395.1, but in this application, there is still a problem that the measurement accuracy is not accurate enough, and in order to further solve the problem of measurement accuracy, this application proposes a solution.

SUMMERY OF THE UTILITY MODEL

Utility model purpose: the utility model aims at providing a difference formula film type wide range pressure sensor can improve pressure sensor's detection precision.

The technical scheme is as follows: a difference formula film type wide range pressure sensor, which comprises a body, the body is the metal block, is provided with endocentric first cavity and second cavity about in the body respectively, separate through the film between first cavity and the second cavity, the film is provided with the arch at the terminal surface center that is located second cavity one side, protruding juncture with the film is provided with a plurality of foil gauges, and is a plurality of the foil gauge constitutes full-bridge circuit and is connected with external circuit board, the top of first cavity is provided with the apron.

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 body in which the first cavity is arranged.

Preferably, a protrusion is disposed on an end surface of the cover plate facing the first cavity, and a cross section of the protrusion on a horizontal plane is the same as a cross section of the first cavity on the horizontal plane.

Preferably, the height of the bump is smaller than the height of the first cavity.

Preferably, the height difference between the protrusion and the end face of the second cavity is not less than 2mm and less than the height of the second cavity.

Preferably, the cross-sectional size of the protrusion in the horizontal plane is smaller than the cross-sectional size of the first cavity in the horizontal plane.

Preferably, the body is integrally formed.

The internal force that transmits the film on the back is the moment of flexure in external force effect apron in this application, because the center of film is provided with the arch, makes the thickness of film have the difference to the stress distribution that leads to different thickness films department is different, therefore the sudden change can exist in the stress of the juncture of different thickness films, the strain gage that sets up in this position can be more clear detect this stress sudden change, thereby make the detection precision of whole sensor higher.

Has the beneficial effects that:

(1) The film thickness difference is formed by arranging the bulges on the film, and the strain gauge is arranged at the thickness change position of the film, so that the strain gauge can detect the stress mutation more clearly, and the overall detection precision of the sensor is improved;

(2) The full-bridge circuit constructed by the strain gauge can reduce the influence of temperature change on the whole sensor in the working process, and further improves the detection precision;

(3) Thereby bellied height and size can be adjusted according to the environment of use and can be applied to different operating modes in this application.

Drawings

FIG. 1 is a side cross-sectional view of the body of the present application;

fig. 2 is a side sectional view of the cover plate of the present application.

Detailed Description

The present application is further illustrated with reference to specific examples below.

As shown in fig. 1-2, is a schematic structural diagram of the present application.

In this embodiment, the metal block-shaped body 1 is included, a first cavity 2 and a second cavity 3 which are concentric are respectively arranged at the upper part and the lower part of the body 1, the first cavity 2 and the second cavity 3 are separated by a film 4, the diameter of the second cavity 3 is larger than that of the first cavity 2, and the diameter of the second cavity 3 is smaller than that of the body 1 where the first cavity 2 is located.

In this embodiment, a cover plate 6 is disposed on the top of the first cavity 2, a protrusion 7 is disposed on an end surface of the cover plate 6 facing to one side of the first cavity 2, a cross section of the protrusion 7 on a horizontal plane is the same as a cross section of the first cavity 2 on the horizontal plane, and a height of the protrusion 7 is smaller than a height of the first cavity 2, so that an interference connection between the cover plate 6 and the first cavity 2 is ensured, and the cover plate 6 can be firmly positioned above the body 1 to bear a load.

In this embodiment, the film 4 is provided with the protrusion 5 in the center of the end face on one side of the second cavity 3, the height difference between the protrusion 5 and the end face of the second cavity 3 is not less than 2mm and less than the height of the second cavity 3, meanwhile, the cross section size of the protrusion 5 on the horizontal plane is less than the cross section size of the first cavity 2 on the horizontal plane, the height and the cross section size of the protrusion 5 are adjusted within this range according to specific working conditions, in this embodiment, the protrusion 5 is 3mm, and the cross section size of the protrusion 5 on the horizontal plane is half of the cross section size of the first cavity 2 on the horizontal plane.

In this embodiment, four strain gauges are disposed at the boundary between the bump 5 and the film 4, and the four strain gauges form a full bridge circuit to be connected to an external circuit board.

In the present embodiment, in order to ensure the simplicity of the whole structure and facilitate the installation, the body 1 is integrally formed.

This application is after installing on the vehicle, the load of vehicle acts on apron 6, the internal force that transmits on film 4 is the moment of flexure, because the center of film 4 is provided with arch 5, make the thickness of film 4 have the difference, thereby it is different to lead to the stress distribution of different thickness films 4 departments, consequently, the stress of different thickness films 4's juncture can have the sudden change, the strain gage that sets up in this position can be more clear detect this stress sudden change, the last load that makes the detection car vehicle that can be more accurate of whole sensor.

Claims

1. A differential film type wide-range pressure sensor comprises a body (1), and is characterized in that: the utility model discloses a solar energy collector, including body (1), body (1) is the metal block, is provided with concentric first cavity (2) and second cavity (3) about in body (1) respectively, separate through film (4) between first cavity (2) and second cavity (3), film (4) are provided with arch (5) at the terminal surface center that is located second cavity (3) one side, arch (5) are provided with a plurality of foil gages with the juncture of film (4), and are a plurality of the foil gage constitutes full bridge circuit and is connected with external circuit board, the top of first cavity (2) is provided with apron (6).

2. The differential membrane type wide range pressure sensor according to claim 1, wherein: the diameter of the second cavity (3) is larger than that of the first cavity (2) and the diameter of the second cavity (3) is smaller than that of the body (1) where the first cavity (2) is located.

3. The differential membrane type wide range pressure sensor according to claim 1, wherein: the end face, facing one side of the first cavity (2), of the cover plate (6) is provided with a convex block (7), and the section of the convex block (7) on the horizontal plane is the same as that of the first cavity (2).

4. A differential membrane-type wide range pressure sensor according to claim 3, wherein: the height of the bump (7) is smaller than that of the first cavity (2).

5. The differential diaphragm-type wide-range pressure sensor according to claim 1, wherein: the height difference between the protrusion (5) and the end face of the second cavity (3) is not less than 2mm and is smaller than the height of the second cavity (3).

6. The differential membrane type wide range pressure sensor according to claim 1, wherein: the cross section size of the bulge (5) on the horizontal plane is smaller than that of the first cavity (3) on the horizontal plane.

7. The differential membrane type wide range pressure sensor according to claim 1, wherein: the body (1) is of an integrally formed structure.