Pressure measuring device based on elastic circular ring structure

Abstract

The invention relates to a pressure measuring device based on elastic circular ring structures, which comprises a shell, three elastic circular ring structures, a pressure plate, a distance measuring sensor and a control device, and is characterized in that the three elastic circular ring structures are uniformly distributed on the bottom surface in the shell according to a regular triangle, and the heights of static configurations of the elastic circular ring structures can be changed under the action of pressure; the pressure plate is fixedly connected to the tops of the three elastic circular ring structures so that the three elastic circular ring structures can be evenly stressed when bearing pressure, and then the height changes of the three elastic circular ring structures are consistent. The distance measuring sensor is installed on the lower portion of the pressure plate, the detection direction of the distance measuring sensor faces downwards so as to measure the change of the height of the elastic circular ring structure, the distance measuring sensor is electrically connected with a control device on the shell so as to send distance measuring data to the control device, and the control device controls the height of the elastic circular ring structure according to a function relation curve between applied pressure and the height of the elastic circular ring structure. And calculating to obtain the magnitude of the applied pressure. The device is simple in structure and easy to use, and can improve the accuracy and reliability of pressure measurement.

Description

Technical Field

[0001] The present invention belongs to the technical field of pressure measurement, and particularly relates to a pressure measurement device based on an elastic ring structure. Background Art

[0002] With the rapid development of the economy, pressure measurement devices have achieved rapid development both in the production process and in scientific research, and are widely used in various industrial automatic control environments, involving fields such as railway transportation, production automation, aerospace, and medical treatment. Currently, conventional pressure measurement devices can be divided into three types: liquid column type, elastic type, and piston type. Specifically, there are mechanical pressure gauges, electromechanical pressure sensors, etc. However, these pressure measurement devices have slow response, poor adaptability, cannot perform high-precision value transfer services, and have high manufacturing process requirements, large volume, and high cost, making it difficult to meet the increasingly developing needs of society. Summary of the Invention

[0003] The purpose of the present invention is to provide a pressure measurement device based on an elastic ring structure, which has a simple structure, is easy to use, and can improve the accuracy and reliability of pressure measurement.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is: a pressure measurement device based on an elastic ring structure, including a housing, three elastic ring structures, a pressure plate, a distance measurement sensor, and a control device. The three elastic ring structures are evenly arranged on the bottom surface inside the housing in an equilateral triangle. The elastic ring structure can change the height of its static configuration under pressure, and corresponds to different static configuration heights under different pressures. The pressure plate is fixedly connected to the tops of the three elastic ring structures to make the three elastic ring structures uniformly stressed when bearing pressure, so that their height changes are consistent. The distance measurement sensor is installed below the pressure plate, and its detection direction is downward to measure the change in the height of the elastic ring structure. The distance measurement sensor is electrically connected to the control device on the housing to send the distance measurement data to the control device. The control device calculates the magnitude of the applied pressure according to the function relationship curve between the applied pressure and the height of the elastic ring structure.

[0005] Further, the function relationship curve between the applied pressure and the height of the elastic ring structure is calculated through the equilibrium equation of the static configuration of the elastic ring structure;

[0006] The elastic ring structure deforms under the action of vertical pressure. At this time, a coordinate system is established. The lower end point of the elastic ring structure form is set as the origin s0 of the natural coordinate. The elastic ring structure form is symmetric about the y-axis, and the total length is The following differential equations are established:

[0007]

[0008] Kθ′'(s) - T x sinθ(s) + T y cosθ(s) = 0

[0009] Wherein, K is the bending stiffness of the elastic ring structure, s represents the natural coordinate arc length of the elastic ring structure form, the starting point of the natural coordinate is s0, x and y are the Cartesian coordinates of any point on the elastic ring structure form, T x and T y are the internal forces in the x - direction and y - direction of the elastic ring structure form respectively, T x is a constant, T y = F / 3, F is the total pressure borne by the pressure plate;

[0010] The differential equation system is combined with the continuity conditions: (θ, θ', x, y) is continuous along the elastic ring structure, and the boundary conditions: That is, the equilibrium configuration of the elastic ring structure under different pressures is solved;

[0011] According to the equilibrium equation of the static configuration of the elastic ring structure, the height of the elastic ring structure is related to the pressure borne by the pressure plate and the bending stiffness of the elastic ring structure; obtaining the functional relationship between the pressure borne by the pressure plate and the height of the elastic ring structure, the pressure applied to the pressure plate can be indirectly measured by measuring the height of the elastic ring structure.

[0012] Furthermore, on the premise of keeping the bending stiffness of a single elastic ring structure unchanged, by continuously changing the applied pressure, the functional relationship curve between the height of a single elastic ring structure and the applied pressure is fitted. The height of a single elastic ring structure is linearly related to the applied pressure, so as to obtain the functional relationship between the height of the elastic ring structure and the applied pressure:

[0013] y = kx + b

[0014] Wherein, y is the height of the elastic ring structure, k is determined by the bending stiffness of the elastic ring structure, different bending stiffnesses correspond to different k values, x is the pressure borne by the pressure plate, that is, the applied pressure, and b is the initial height of the elastic ring structure when no pressure is applied.

[0015] Furthermore, by changing the bending stiffness of the elastic ring structure to change the k value, thereby changing the functional relationship between the height of the elastic ring structure and the applied pressure, and further realizing the adjustment of the measurement range of the pressure measuring device.

[0016] Furthermore, the pressure plate is a square pressure plate, the center of the square pressure plate coincides with the symmetry centers of three elastic ring structures, and the distance measuring sensor is installed at the center position of the square pressure plate.

[0017] Further, a groove is formed in the center of the lower part of the square pressure plate, and the ranging sensor is installed in the groove of the square pressure plate by means of magnetic adsorption.

[0018] Further, the control device includes a display screen, which is embedded on one side of the housing, and the control device displays the calculated pressure on the display screen.

[0019] Compared with the prior art, the present invention has the following beneficial effects: A pressure measurement device based on an elastic ring structure is provided. The device utilizes the fact that the elastic ring structure will change its static configuration height under pressure, and measures the pressure by measuring the height change of the elastic ring structure. It has a simple structure, is easy to use, and has high measurement accuracy and reliability. The device is simple to install and calibrate, and the measurement range can be adjusted by changing the bending stiffness of the elastic ring structure. In addition, the device is small in size, light in weight, easy to carry, easy to integrate, and has strong adaptability, meeting the increasing needs of society. Description of the Drawings

[0020] Figure 1 is a schematic diagram of the composition structure of the pressure measurement device according to an embodiment of the present invention.

[0021] Figure 2 is a schematic diagram of the overall structure of the pressure measurement device according to an embodiment of the present invention.

[0022] Figure 3 is a schematic diagram of the connection structure between the pressure plate and three elastic ring structures in an embodiment of the present invention.

[0023] Figure 4 is a force analysis diagram of a single elastic ring structure under pressure in an embodiment of the present invention.

[0024] Figure 5 is a graph of the functional relationship between the height of a single elastic ring structure and the pressure applied in an embodiment of the present invention.

[0025] Figure 6 is a graph of the functional relationship between the height of the elastic ring structure and the pressure applied in an embodiment of the present invention. Detailed Embodiments

[0026] The present invention will be further described below with reference to the drawings and embodiments.

[0027] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise specified, 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 the present application belongs.

[0028] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0029] As Figure 1 , 2 shown, this embodiment provides a pressure measurement device based on an elastic ring structure, including a housing 7, three elastic ring structures (a first elastic ring structure 3, a second elastic ring structure 4, and a third elastic ring structure 5), a pressure plate 2, a distance measuring sensor 1, and a control device. The three elastic ring structures 3, 4, and 5 are evenly arranged on the bottom surface inside the housing 7 in an equilateral triangle, that is, the included angle between any two adjacent elastic ring structures is 120°. The elastic ring structure can change the height of its static configuration under pressure and corresponds to different static configuration heights under different pressures. The pressure plate 2 is fixedly connected to the tops of the three elastic ring structures 3, 4, and 5 (as Figure 3 shown) to make the three elastic ring structures evenly stressed when bearing pressure, so that their shapes and heights change uniformly. The distance measuring sensor 1 is installed below the pressure plate 2, and its detection direction is downward to measure the change in the height of the elastic ring structure. The distance measuring sensor 1 is electrically connected to the control device on the housing 7 to send the distance measurement data to the control device. The control device calculates the magnitude of the applied pressure according to the function relationship curve between the applied pressure and the height of the elastic ring structure.

[0030] In this embodiment, the pressure plate 2 is a square pressure plate. The center of the square pressure plate coincides with the symmetry center of the three elastic ring structures 3, 4, and 5. The distance measuring sensor 1 is installed at the center position of the square pressure plate. Specifically, a groove is opened at the center of the lower part of the square pressure plate, and the distance measuring sensor 1 is installed in the groove of the square pressure plate by magnetic adsorption.

[0031] In this embodiment, the control device includes a display screen 6. The display screen 6 is embedded on one side surface of the housing 7. The control device displays the calculated pressure on the display screen.

[0032] In this embodiment, the function relationship curve between the applied pressure and the height of the elastic ring structure is calculated through the equilibrium equation of the static configuration of the elastic ring structure.

[0033] As Figure 4As shown, the elastic ring structure undergoes an ellipse-like deformation under vertical pressure. At this time, a coordinate system is established. The lower endpoint of the elastic ring structure is set as the origin s0 (s = 0) of the natural coordinates. The elastic ring structure is symmetric about the y-axis, and the total length is The following differential equations are established:

[0034] x'(s) = cosθ(s), y'(s) = sinθ(s)

[0035] Kθ′'(s) - T x sinθ(s) + T y cosθ(s) = 0

[0036] where K is the bending stiffness of the elastic ring structure, s represents the natural coordinate arc length of the elastic ring structure (the starting point of the natural coordinates is s0), x and y are the Cartesian coordinates of any point on the elastic ring structure, T x and T y are the internal forces in the x-direction and y-direction of the elastic ring structure, T x is a constant, T y = F / 3, and F is the total pressure borne by the pressure plate.

[0037] Combining the above differential equations with the continuity conditions: (θ, θ', x, y) is continuous along the elastic ring structure, and the boundary conditions: the equilibrium configuration of the elastic ring structure under different pressures can be solved.

[0038] According to the equilibrium equation of the static configuration of the elastic ring structure, the height of the elastic ring structure is related to the pressure borne by the pressure plate and the bending stiffness of the elastic ring structure; by obtaining the functional relationship between the pressure borne by the pressure plate and the height of the elastic ring structure, the pressure applied to the pressure plate can be indirectly measured by measuring the height of the elastic ring structure.

[0039] In this embodiment, the side length of the square pressure plate is 0.09 m. The radii of the three elastic ring structures are 0.01273 m, the thickness is 0.000381 m, the width is 0.016 m, the length is 0.08 m, the elastic modulus is 3.91e+10, and the bending stiffness is 0.0028833.

[0040] While keeping the bending stiffness of a single elastic ring structure unchanged, the applied pressure is continuously changed, and the functional relationship curve between the height of a single elastic ring structure and the applied pressure is fitted, as Figure 5 shown. It can be found from the fitted functional relationship curve that the height of a single elastic ring structure is linearly related to the applied pressure. Further transformation can obtain the functional relationship curve between the height of the elastic ring structure and the applied pressure, as Figure 6As shown. The functional relationship between the height of the elastic ring structure and the applied pressure is:

[0041] y = kx + b

[0042] Where, y is the height of the elastic ring structure, k is determined by the bending stiffness of the elastic ring structure, and different bending stiffnesses correspond to different k values. x is the pressure borne by the pressure plate, that is, the applied pressure, and b is the initial height of the elastic ring structure when no pressure is applied.

[0043] In this embodiment, the functional relationship between the height of the elastic ring structure and the applied pressure is:

[0044] y = -0.0044x + 2.5620

[0045] Where, k = -0.0044, b = 2.5620, that is, the initial height of the elastic ring structure when no pressure is applied is 2.5620 cm.

[0046] By changing the bending stiffness of the elastic ring structure to change the k value, thereby changing the functional relationship between the height of the elastic ring structure and the applied pressure, and further realizing the adjustment of the measurement range of the pressure measuring device. When the applied pressure is large, we can select an elastic ring structure with a large bending stiffness to achieve more accurate measurement.

[0047] From the above analysis, it can be seen that the pressure measuring device provided by the present invention can accurately obtain the magnitude of the measured pressure. When no pressure is applied, the square pressure plate 2 is in the initial state, and the ranging sensor 1 measures the initial height of the elastic ring structure. When measuring pressure, we only need to apply the measured pressure to the square pressure plate 2 of the pressure measuring device. Under the action of the pressure, the heights of the three elastic ring structures 3, 4, and 5 will change uniformly. At this time, the ranging sensor 1 measures the height of the elastic ring structure after the pressure is applied and sends the changed height to the control device. The control device calculates the magnitude of the applied pressure according to the functional relationship y = -0.0044x + 2.5620 between the applied pressure and the height of the elastic ring structure and displays it on the display screen 6.

[0048] The above is only a preferred embodiment of the present invention, and it is not a limitation of the present invention in other forms. Any person skilled in the art may use the disclosed technical content to make changes or modifications into equivalent embodiments with equivalent changes. However, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution content of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A pressure measurement device based on an elastic ring structure, characterized in that It includes a housing, three elastic ring structures, a pressure plate, a distance measuring sensor and a control device. The three elastic ring structures are evenly arranged on the bottom surface inside the housing in an equilateral triangle. The elastic ring structures can change the height of their static configurations under pressure, and correspond to different static configuration heights under different pressures. The pressure plate is fixedly connected to the tops of the three elastic ring structures so that the three elastic ring structures are evenly stressed when bearing pressure, and thus their height changes are consistent. The distance measuring sensor is installed below the pressure plate, and its detection direction is downward to measure the change in the height of the elastic ring structures. The distance measuring sensor is electrically connected to the control device on the housing to send the distance measurement data to the control device. The control device calculates the magnitude of the applied pressure according to the function relationship curve between the applied pressure and the height of the elastic ring structures.

2. The pressure measuring device based on an elastic ring structure according to claim 1, characterized in that, The function relationship curve between the applied pressure and the height of the elastic ring structures is obtained by calculating according to the equilibrium equation of the static configuration of the elastic ring structures. The elastic ring structure deforms under the action of vertical pressure. At this time, a coordinate system is established. The lower end point of the elastic ring structure is set as the origin s0 of the natural coordinate. The elastic ring structure is symmetric about the y-axis, and the total length is The following differential equations are established: x'(s) = cosθ(s), y'(s) = sinθ(s) Kθ′'(s) - T x sinθ(s) + T y cosθ(s) = 0 where K is the bending stiffness of the elastic ring structure, s represents the natural coordinate arc length of the elastic ring structure form, the starting point of the natural coordinate is s0, x and y are the Cartesian coordinates of any point on the elastic ring structure form, T x and T y are the internal forces in the x - direction and y - direction of the elastic ring structure form, T x is a constant, T y = F / 3, where F is the total pressure borne by the pressure plate; The differential equation system is combined with the continuity condition: (θ, θ', x, y) is continuous along the elastic circular ring structure, and the boundary conditions: θ(0) = 0, y(0) = 0, x(0) = 0, that is, the equilibrium configurations of the elastic circular ring structure under different pressures are solved; According to the equilibrium equation of the static configuration of the elastic ring structures, the height of the elastic ring structures is related to the pressure borne by the pressure plate and the bending stiffness of the elastic ring structures. By obtaining the function relationship between the pressure borne by the pressure plate and the height of the elastic ring structures, the pressure applied to the pressure plate can be indirectly measured by measuring the height of the elastic ring structures.

3. A pressure measuring device based on an elastic ring structure according to claim 1, characterized in that, Under the condition of keeping the bending stiffness of a single elastic ring structure unchanged, continuously change the applied pressure, and fit the function relationship curve between the height of a single elastic ring structure and the pressure it receives. The height of a single elastic ring structure is linearly related to the pressure it receives, so as to obtain the function relationship between the height of the elastic ring structures and the applied pressure: y = kx + b Wherein, y is the height of the elastic ring structures, k is determined by the bending stiffness of the elastic ring structures, and different bending stiffnesses correspond to different k values. x is the pressure borne by the pressure plate, that is, the applied pressure, and b is the initial height of the elastic ring structures when no pressure is applied.

4. The pressure measuring device based on an elastic ring structure according to claim 3, characterized in that, By changing the bending stiffness of the elastic ring structures to change the k value, thereby changing the function relationship between the height of the elastic ring structures and the applied pressure, and then realizing the adjustment of the measurement range of the pressure measuring device.

5. The pressure measuring device based on an elastic ring structure according to claim 1, characterized in that, The pressure plate is a square pressure plate. The center of the square pressure plate coincides with the symmetry center of the three elastic ring structures. The distance measuring sensor is installed at the center position of the square pressure plate.

6. The pressure measuring device based on an elastic ring structure according to claim 5, wherein A groove is opened at the center of the lower part of the square pressure plate. The distance measuring sensor is installed in the groove of the square pressure plate by means of magnetic adsorption.

7. The pressure measuring device based on an elastic ring structure according to claim 1, characterized in that, The control device includes a display screen. The display screen is embedded on one side surface of the housing. The control device displays the calculated pressure on the display screen.

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