Pressure measuring device

Abstract

The invention discloses a pressure measuring device, which comprises a first pressure-bearing assembly, a pressure conversion assembly and a second pressure-bearing assembly, and is characterized in that the pressure conversion assembly is mounted at the bottom of an inner cavity of the first pressure-bearing assembly, and the second pressure-bearing assembly is mounted in the pressure conversion assembly; the pressure measuring device has the advantage of good stability, and solves the problems that the pressure measuring difficulty is high, the pressure measuring precision of the strain gauge is influenced and the severe working condition is difficult to cope with because the compression force is inconvenient to convert into the drawing force in the using process of the existing pressure measuring device.

Description

Technical Field

[0001] The invention relates to the technical field of pressure measurement, in particular to a pressure measurement device. Background Art

[0002] At present, the devices used to detect structural deformation generally use strain gauges to work. The elastic element in the measuring device produces elastic deformation after being compressed, causing the resistance of the strain gauge to change. The resistance signal change of the strain gauge is converted into a force signal through the circuit to complete the measurement. Since strain gauge measurement is more suitable for tensile deformation, the elastic element of the measuring device needs to convert the compression deformation into tensile deformation for measurement.

[0003] Existing force measuring devices convert pressure into bending of a beam or sheet through a corresponding structure, attach a strain gauge to the stretching side of the beam or sheet during bending, measure the deformation of the stretching side, and finally convert it into a force signal through circuit processing. For example, a pressure sensor with Chinese patent publication number CN214791440U is provided with a hollow circular sheet as an elastic element. When pressure is applied, the elastic element will be compressed to cause bending deformation, and the final pressure value can be obtained through circuit processing. Based on the above characteristics of the sensor, since pressure is converted into bending, the linearity of the elastic deformation measured by the strain gauge is poor, special circuit processing is required, and it is easy to fail under harsh working conditions, and the accuracy is low.

[0004] During use, existing pressure measuring devices are not convenient for converting compressive force into tensile force, which makes pressure measurement difficult, affects the pressure measurement accuracy of the strain gauge, and is difficult to cope with harsh working conditions. Summary of the invention

[0005] The purpose of the present invention is to provide a pressure measuring device with the advantage of good stability, which solves the problem that the existing pressure measuring device is not convenient to convert the compressive force into the tensile force during use, resulting in great difficulty in pressure measurement, affecting the measurement accuracy of the strain gauge for pressure, and is difficult to cope with harsh working conditions.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a pressure measuring device, comprising a first pressure-bearing component, a pressure conversion component and a second pressure-bearing component, wherein the pressure conversion component is installed at the bottom of the inner cavity of the first pressure-bearing component, and the second pressure-bearing component is installed inside the pressure conversion component.

[0007] As a preferred pressure measuring device of the present invention, the outer surface of the pressure conversion component is slidingly connected to the inner wall of the first pressure-bearing component, the middle section of the pressure conversion component is provided with a thin-walled deformation portion, and a strain gauge is attached to the surface of the thin-walled deformation portion.

[0008] As a preferred pressure measuring device of the present invention, the second pressure-bearing component is movably connected to the inner wall of the pressure conversion component.

[0009] As a preferred pressure measuring device of the present invention, a pressure ring is provided at the bottom of the pressure conversion component, and the upper surface of the pressure ring contacts the bottom surface of the first pressure-bearing component to transmit pressure. When the pressure ring is compressed, the thin-wall deformation part is deformed, so that the strain gauge is stretched to measure the pressure.

[0010] As a preferred pressure measuring device of the present invention, when measuring pressure, the first pressure-bearing component is first connected to the upper connecting piece, and then the second pressure-bearing component is connected to the lower connecting piece. After the installation is completed, the pressure on the entire device is measured. During the downward pressing of the first pressure-bearing component, its bottom exerts pressure on the deformation ring. After the pressure ring is pressed, the thin-wall deformation part is deformed and the strain gauge is stretched. The pressure on the current device is measured by the deformation of the strain gauge.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. When measuring pressure, the present invention can convert compressive force into tensile force for measurement, and has the advantages of good linearity, high accuracy, and simple measurement circuit. It can effectively improve the accuracy of pressure measurement, simplify the pressure measurement circuit, and improve the stability of the pressure measurement device. Moreover, the strain gauge is protected inside to prevent it from being affected by external factors, ensuring that it can work normally for a long time under harsh working conditions.

[0013] 2. The present invention measures the pressure exerted on the device through a pressure conversion assembly. When the first pressure-bearing assembly is pressed downward, its bottom surface exerts pressure on the pressure ring at the bottom of the pressure conversion assembly. After the pressure ring is pressed, the thin-wall deformation part is deformed and the strain gauge is stretched. The pressure exerted on the current device is measured by the deformation of the strain gauge. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present invention;

[0015] Figure 2 It is a schematic cross-sectional view of the structure of the first embodiment of the present invention;

[0016] Figure 3 This is a schematic structural diagram of the first pressure-bearing component in Embodiment 1 of the present invention;

[0017] Figure 4 It is a schematic cross-sectional structural diagram of the first pressure-bearing component in the first embodiment of the present invention;

[0018] Figure 5 This is a schematic diagram of the structure of a pressure conversion assembly in Embodiment 1 of the present invention;

[0019] Figure 6 It is a schematic cross-sectional structural diagram of a pressure conversion assembly in Embodiment 1 of the present invention;

[0020] Figure 7 This is a schematic structural diagram of the second pressure-bearing component in Embodiment 1 of the present invention;

[0021] Figure 8 This is a structural schematic diagram of Embodiment 2 of the present invention;

[0022] Fig. 9 This is a schematic cross-sectional view of the structure of Embodiment 2 of the present invention;

[0023] Fig.10 This is a schematic structural diagram of the first pressure-bearing component in Embodiment 2 of the present invention;

[0024] Fig.11 It is a schematic cross-sectional structural diagram of the first pressure-bearing component in the second embodiment of the present invention;

[0025] Fig.12 This is a schematic diagram of the structure of a pressure conversion assembly in Embodiment 2 of the present invention;

[0026] Fig.13 It is a schematic cross-sectional structural diagram of a pressure conversion assembly in Embodiment 2 of the present invention;

[0027] Fig.14 This is a schematic diagram of the structure of the second pressure-bearing component in Embodiment 2 of the present invention.

[0028] In the figure: 1. first pressure-bearing component; 2. pressure conversion component; 201. thin-wall deformation portion; 202. pressure ring; 3. second pressure-bearing component; 4. strain gauge. DETAILED DESCRIPTION

[0029] Embodiment 1

[0030] Reference Figure 1-Figure 7 A pressure measuring device includes a first pressure-bearing component 1, a pressure conversion component 2 and a second pressure-bearing component 3. The pressure conversion component 2 is installed at the bottom of the inner cavity of the first pressure-bearing component 1, and the second pressure-bearing component 3 is installed inside the pressure conversion component 2.

[0031] Furthermore, the outer surface of the pressure conversion component 2 is slidably connected to the inner wall of the first pressure-bearing component 1 , and a thin-walled deformation portion 201 is provided in the middle section of the pressure conversion component 2 , and a strain gauge 4 is attached to the surface of the thin-walled deformation portion 201 .

[0032] Furthermore, the second pressure-bearing component 3 is movably connected to the inner wall of the pressure conversion component 2 .

[0033] Furthermore, a pressure ring 202 is provided at the bottom of the pressure conversion component 2, and the upper surface of the pressure ring 202 contacts the bottom surface of the first pressure-bearing component 1 to transmit pressure. When the pressure ring 202 is compressed, it drives the thin-walled deformation part 201 to deform, causing the strain gauge 4 to be stretched to measure the pressure.

[0034] When measuring the pressure, first connect the first pressure-bearing component 1 to the upper connecting piece, and then connect the second pressure-bearing component 3 to the lower connecting piece. After the installation is completed, measure the pressure on the entire device. During the downward pressure of the first pressure-bearing component 1, its bottom applies pressure to the pressure ring 202. After the pressure ring 202 is compressed, the thin-walled deformation part 201 is deformed and the strain gauge 4 is stretched. The pressure on the current support rod is measured by the deformation of the strain gauge 4.

[0035] Furthermore, the shapes of the first pressure-bearing component 1 and the second pressure-bearing component 3 are adapted to the pressure conversion component 2, and the entire device can be turned upside down during use.

[0036] Embodiment 2

[0037] Reference Figure 8-Figure 14 The difference between this embodiment and the first embodiment is that the pressure conversion assembly 2 is installed at the bottom of the inner cavity of the first pressure-bearing assembly 1 through a threaded connection, and the second pressure-bearing assembly 3 is installed inside the pressure conversion assembly 2 through a threaded connection. This embodiment uses threaded connections between the components to improve the installation flexibility of the device.

[0038] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A pressure measuring device, comprising a first pressure-bearing component (1), a pressure conversion component (2) and a second pressure-bearing component (3), characterized in that: The pressure conversion component (2) is installed at the bottom of the inner cavity of the first pressure-bearing component (1), and the second pressure-bearing component (3) is installed inside the pressure conversion component (2).

2. A pressure measuring device according to claim 1, characterized in that: The outer surface of the pressure conversion component (2) is slidably connected to the inner wall of the first pressure-bearing component (1), and a thin-walled deformation portion (201) is provided in the middle section of the pressure conversion component (2), and a strain gauge (4) is attached to the surface of the thin-walled deformation portion (201).

3. A pressure measuring device according to claim 1, characterized in that: The second pressure-bearing component (3) is movably connected to the inner wall of the pressure conversion component (2).

4. A pressure measuring device according to claim 2, characterized in that: A pressure ring (202) is provided at the bottom of the pressure conversion component (2), and the upper surface of the pressure ring (202) contacts the bottom surface of the first pressure-bearing component (1) to transmit pressure. When the pressure ring (202) is pressurized, it drives the thin-walled deformation part (201) to deform, causing the strain gauge (4) to be stretched, thereby measuring the pressure.

5. A pressure measuring device according to claim 4, characterized in that: When measuring pressure, the first pressure-bearing component (1) is first connected to the upper connecting piece, and then the second pressure-bearing component (3) is connected to the lower connecting piece. After the installation is completed, the pressure on the entire device is measured. During the downward pressing of the first pressure-bearing component (1), its bottom exerts pressure on the pressure ring (202). After the pressure ring (202) is pressed, the thin-walled deformation part (201) is deformed and the strain gauge (4) is stretched. The pressure on the current device is measured by the deformation of the strain gauge (4).

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