A pressure sensor

Abstract

The present invention discloses a pressure sensor, which belongs to the field of pressure testing technology, and includes: an elastic component, a pressure plate, a sliding component, a mobile monitoring unit and a signal receiving unit. The sliding component extends out of the pressure plate to the outermost end to form a test surface in the measurement area, and the end of the sliding component away from the test surface penetrates the pressure plate and forms a through hole in the pressure plate. A pressure sensor includes the above-mentioned elastic component, and also includes a supporting component, a liquid storage chamber and a strain gauge. When the sliding component moves, the mobile monitoring unit of the present invention can send a separation signal. When the pressure-applying part applies pressure to the elastic component in the measurement area, the measured shape can be changed according to the shape of the pressure-applying component, so as to accurately measure the position. The present invention can monitor the precise position, improve the monitoring accuracy, and can be used for more precise components. The present invention converts the pressure generated by the pressure-applying component on the elastic component into the flow of liquid in the liquid storage chamber.

Description

Technical Field

[0001] The present invention relates to the technical field of pressure testing, and in particular to a pressure sensor. Background Art

[0002] The elastic component is a component in the pressure sensor. The elastic component can sense the change of external pressure and deform accordingly; this deformation will further cause other components inside the sensor (such as resistance, capacitance or inductance, etc.) to change, thereby changing the electrical signal output of the sensor.

[0003] When external pressure acts on the sensor, the elastic component receives the pressure and deforms according to its physical properties.

[0004] Conventional pressure sensors face challenges in making accurate measurements when the object under test applies pressure to the elastic component in the pressure sensor, if not only the magnitude of the pressure changes, but also the location where the pressure is applied. These sensors may have difficulty accurately identifying the specific location where the force is applied because they are primarily designed to monitor the magnitude of the pressure rather than the distribution of the pressure. Therefore, in application scenarios where it is necessary to determine both the magnitude of the pressure and the location where it is applied, conventional pressure sensors may not be able to provide sufficiently accurate data.

[0005] At the same time, it should be noted that pressure sensors using conventional elastic components cannot sensitively sense the subtle changes in strain gauges caused by the pressure-applying components due to their characteristic limitations when used in precision instruments. This may cause the sensor to perform poorly when measuring precise pressure changes. Summary of the invention

[0006] In view of the above-mentioned technical deficiencies, an object of the present invention is to provide a pressure sensor capable of monitoring the specific distribution position of pressure.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solution: The present invention provides an elastic component, the elastic component can form a measurement area, and the elastic component includes:

[0008] A pressure plate, which is the base of the elastic component, is provided with a base surface on the pressure plate, and the projection of the measuring area perpendicular to the base surface is embedded inside the base surface;

[0009] There are at least two sliding components, which are independently slidably mounted on the pressure plate in a direction perpendicular to the base surface, and the projection of the sliding components perpendicular to the base surface forms the measurement area. The sliding components extend out of the pressure plate to the outermost end to form a test surface in the measurement area, and the end of the sliding components away from the test surface penetrates the pressure plate and forms a through hole on the pressure plate;

[0010] a movement monitoring unit, which corresponds to the sliding component one by one, and is used to monitor the movement of the sliding component, and;

[0011] The signal receiving unit is electrically connected to the mobile monitoring unit and is used to receive the electrical signal sent by the mobile monitoring unit.

[0012] Preferably, the sliding component comprises:

[0013] A rod-shaped object, one end of which is inserted into the inside of the pressure plate, and the other end of which extends out of the base surface to form a test surface;

[0014] The force-applying component is installed inside the pressure-bearing plate and can apply a thrust to the rod-shaped object to slide outward.

[0015] Preferably, the mobile monitoring unit comprises:

[0016] A first contact point, which is disposed on the sliding member;

[0017] A second contact point, which is arranged on the pressure plate;

[0018] When the sliding component extends out of the pressure plate to the outermost end, the first contact point and the second contact point contact each other.

[0019] Preferably, a sealing gasket is provided between each sliding component and the through hole.

[0020] A pressure sensor, comprising the elastic component, further comprising:

[0021] A supporting component, which is provided with a connection port connected to the pressure-bearing plate, and is sealedly connected to a side of the pressure-bearing plate close to the through hole through the connection port;

[0022] A liquid storage cavity is arranged in the supporting component, and the sliding component can extend into the liquid storage cavity. When the sliding component extends into the liquid storage cavity, the shape of the liquid storage cavity can be changed according to the extension amount of the sliding component;

[0023] The strain gauge is arranged inside the supporting component, and the strain gauge can be deformed according to the shape change of the liquid storage cavity.

[0024] Preferably, the supporting member comprises:

[0025] a sliding hole, which is in communication with the liquid storage chamber;

[0026] The slide rod is slidably installed in the slide hole, one end of the slide rod is sealed and connected to the liquid storage cavity, and the other end of the slide rod is connected to the strain gauge.

[0027] Preferably, the supporting member further comprises:

[0028] A first shell body, which is sealed and connected to the pressure plate, and the liquid storage chamber is arranged inside the first shell body;

[0029] A second shell connected to the first shell, wherein the sliding hole is arranged in the second shell;

[0030] The third housing is connected to an end of the second housing away from the first housing, and the strain gauge is arranged in the third housing.

[0031] Preferably, the aperture of the sliding hole is smaller than the chamber cross section of the liquid storage chamber.

[0032] Preferably, an elastic body is provided inside the sliding hole, and the elastic body applies an elastic force to the sliding rod.

[0033] The beneficial effects of the present invention are:

[0034] Compared with the prior art that "it is difficult to accurately identify the specific position of the applied force because they are mainly designed to monitor the size of the pressure rather than the pressure distribution", the present invention mainly provides a solution of "setting a measuring area on the elastic component and being able to monitor the specific position within the measuring area", specifically including: setting a plurality of sliding components on the pressure plate, the plurality of sliding components will cover the entire measuring area, and each sliding component is provided with a mobile monitoring unit, when the sliding component moves, the mobile monitoring unit can send a separation signal, when the pressure part applies pressure to the elastic component in the measuring area, the measured shape can change according to the shape of the pressure part, thereby accurately measuring the position. Since the present invention can monitor the precise position, the monitoring accuracy is improved and it can be applied to more precise components.

[0035] The present invention converts the pressure exerted by the pressure-applying component on the elastic component into the flow of liquid in the liquid storage chamber. More importantly, the channel for the flow of liquid adopts a sliding hole design with a smaller aperture, which enables the sensor to more accurately monitor the pressure change of the pressure-applying component on the elastic component, thereby achieving high-precision pressure measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the elastic component in the first embodiment.

[0037] Figure 2 This is a schematic diagram of the monitoring position in Example 1.

[0038] Figure 3 It is a schematic diagram of the structure of the elastic component.

[0039] Figure 4 This is the internal diagram of the elastic component.

[0040] Figure 5 This is the compression state diagram of the elastic component.

[0041] Figure 6 This is an internal diagram of the pressure sensor in Example 4.

[0042] In the figure: 1, pressure plate; 2, rod-shaped object; 3, strain gauge; 4, sliding rod; 5, first contact; 6, second contact; 7, first shell, 71, liquid storage chamber; 8, second shell; 9, third shell. DETAILED DESCRIPTION

[0043] The present invention is described below with specific embodiments, but they are not intended to be limiting of the invention.

[0044] Embodiment 1

[0045] like Figure 1 and Figure 2 As shown, in this embodiment, an elastic component is provided, which can form a measuring area. The elastic component includes: a pressure plate 1, a plurality of sliding components, a mobile monitoring unit and a signal receiving unit.

[0046] The pressure plate 1 is the base of the elastic component. A base surface is provided on the pressure plate 1. The projection of the measuring area perpendicular to the base surface is embedded inside the base surface. Figure 3 , the base surface may be the surface of the pressure plate 1;

[0047] The sliding component is independently slidably installed on the pressure plate 1 along a direction perpendicular to the base surface. The projection of the sliding component perpendicular to the base surface forms the measuring area. During measurement, the pressure component generally applies pressure to the elastic component in the direction perpendicular to the base surface inside the measuring area to cause the sliding component to displace, thereby causing the elastic component to deform. When the number of sliding components is large, the shape of the measurement can be changed according to the shape of the pressure component. Figure 1 When the shape of the pressure-applying component is circular A or square B, the measured shape is also different. When the sliding component extends out of the pressure plate 1 to the outermost end, a test surface can be formed in the measurement area. The test surface is a plane. The pressure-applying component acts on the test surface. The end of the sliding component away from the test surface penetrates the pressure plate 1 and forms a through hole on the pressure plate 1. A sealing gasket is provided between each of the sliding components and the through hole, and the sealing gasket can seal the sliding component.

[0048] The mobile monitoring units correspond to the sliding components one by one, and the sliding components and the mobile monitoring units jointly construct a monitoring network on the pressure plate 1, which consists of multiple precise monitoring positions. Figure 2In the system, these monitoring positions are carefully marked as a1, a2, a3, etc., so that each position can be clearly identified and located. These monitoring units are accurate and can capture the changes of sliding parts. Whenever a new sliding part moves, the mobile monitoring unit will immediately identify and record this change, and then accurately transmit the position information through electrical signals. This real-time position transmission mechanism ensures the immediacy and accuracy of the data. The mobile monitoring unit is used to monitor the movement of the sliding part. When the sliding part moves, the corresponding mobile monitoring unit detects this change and generates a corresponding electrical signal.

[0049] A signal receiving unit is electrically connected to the mobile monitoring unit and is used to receive the electrical signal sent by the mobile monitoring unit. The signal receiving unit may be a microcontroller or other device capable of processing electrical signals. The signal receiving unit receives the electrical signal from the mobile monitoring unit and performs corresponding operations based on these signals. The signal receiving unit is a commonly used component in the prior art and is used in conjunction with the mobile monitoring unit. The signal receiving unit is a component that has been disclosed in the prior art and is not the content to be protected by the present invention, so the present invention will not elaborate on it.

[0050] Embodiment 2

[0051] like Figure 2-Figure 5 As shown, based on the first embodiment, this embodiment provides one of the sliding components, which is as follows:

[0052] The sliding component includes: a rod-shaped object 2 and a force-applying component. One end of the rod-shaped object 2 is slidably inserted into the inside of the pressure plate 1 along a direction perpendicular to the base surface, and the other end extends out of the base surface to form a test surface. The rod-shaped object 2 can be a cylinder. When one end of multiple rod-shaped objects 2 is extended to the outermost part, the extended ends of multiple rod-shaped objects 2 can form a plane. This plane is the test surface of the elastic component. The pressure-applying component can apply pressure to one or more parts of the test surface on this test surface, so that the rod-shaped object 2 under pressure slides on the pressure plate 1; the force-applying component is installed inside the pressure plate 1, and it can apply an outward sliding thrust to the rod-shaped object 2. The force-applying component has the function of applying an outward thrust to all rod-shaped objects 2 at the same time. When the rod-shaped object 2 is extended, the mobile monitoring unit can effectively monitor its state. The specific structure of the force-applying component can be designed as a spring. For example Figure 3 As shown, the spring is installed inside the pressure plate 1, and one end of the spring is connected to the rod 2. In addition, a special limit mechanism is provided on the rod 2, which ensures that the rod 2 can only extend to a specific distance, and the extended lengths of multiple rods 2 are consistent. In this way, the extended ends of multiple rods 2 together constitute the test surface. Figure 3 and Figure 5From the above, when the rod 2 is subjected to the pressure F, the rod 2 will have a corresponding displacement. At this time, the movement monitoring unit arranged on the rod 2 can monitor and record the displacement change in real time.

[0053] Embodiment 3

[0054] like Figure 1 and Figure 2 As shown, based on the first and second embodiments, this embodiment provides one of the mobile monitoring units, which is as follows:

[0055] The movement monitoring unit includes: a first contact 5 and a second contact 6, wherein the first contact 5 is arranged on the sliding component, and the second contact 6 is arranged on the pressure plate 1. When the sliding component extends out of the pressure plate 1 to the outermost end, the first contact 5 and the second contact 6 contact each other, and the first contact 5 and the second contact 6 are used to monitor whether the sliding component is at the outermost end extending out of the pressure plate 1. When the first contact 5 and the second contact 6 separate, the sliding component moves under pressure, and the movement monitoring unit can monitor the separation of the first contact 5 and the second contact 6, so that the movement monitoring unit sends an electrical signal to the signal receiving unit.

[0056] Embodiment 4

[0057] like Figure 1-Figure 6 As shown, this embodiment is a pressure sensor including an elastic component in any of the above embodiments, including a supporting component, a liquid storage chamber 71 and a strain gauge 3. The supporting component is provided with a connection port connected to the pressure plate 1, and is sealed and connected to the pressure plate 1 through the connection port; the liquid storage chamber 71 is arranged in the supporting component, and the sliding component can extend into the liquid storage chamber 71. When the sliding component extends into the liquid storage chamber 71, the shape of the liquid storage chamber 71 can change according to the extension amount of the sliding component, and the inside of the liquid storage chamber 71 can be filled with sealing oil. When the sliding component extends into the liquid storage chamber 71, the pressure inside the liquid storage chamber 71 increases, and its shape will change. The close contact between the supporting component and the pressure plate 1 is mainly to seal the liquid storage chamber 71 to prevent the liquid storage chamber 71 from leaking; the strain gauge 3 is arranged inside the supporting component, and the strain gauge 3 can be deformed according to the shape change of the liquid storage chamber 71. When the shape inside the liquid storage chamber 71 changes, pressure is applied to the strain gauge 3, causing the strain gauge 3 to deform, and this deformation will cause the resistance value inside the strain gauge 3 to change. The strain gauge 3 is connected to a bridge circuit. By measuring the resistance change on the bridge circuit, the tiny displacement and strain of the strain gauge 3 can be indirectly measured. The bridge circuit is a prior art and is not the problem to be solved by the present invention, so the present invention will not explain it in detail.

[0058] Specifically, the supporting component includes a sliding hole and a sliding rod 4, and the sliding hole is connected to the liquid storage chamber 71; the sliding rod 4 is slidably installed in the sliding hole, and an elastomer is provided inside the sliding hole, and the elastomer applies an elastic force to the sliding rod 4. In the initial state, the sliding rod 4 only contacts the strain gauge 3 and does not apply force to the strain gauge 3, and the shape of the strain gauge 3 does not change. The aperture of the sliding hole is smaller than the chamber cross-section of the liquid storage chamber 71. When the aperture of the sliding hole is relatively small, when the chamber shape of the liquid storage chamber 71 changes, the movement distance of the oil in the sliding hole will be relatively long. This larger moving distance enables the strain gauge 3 to more sensitively sense changes in the shape of the liquid storage chamber 71, thereby improving the monitoring accuracy and response speed of the strain gauge 3. One end of the slide rod 4 is sealed and connected to the liquid storage chamber 71, and the other end of the slide rod 4 is connected to the strain gauge 3. The slide rod 4 is arranged in the sliding hole. The change in the shape of the liquid storage chamber 71 means that the liquid storage chamber 71 will extend toward the inside of the sliding hole and push the slide rod 4 to slide. The slide rod 4 rests on the strain gauge 3, thereby driving the strain gauge 3 to move.

[0059] Specifically, the supporting component further includes: a first shell 7, a second shell 8 and a third shell 9. The first shell 7 is sealed and connected to the pressure plate 1. The liquid storage chamber 71 is arranged inside the first shell 7. Both ends of the first shell 7 are provided with openings. The connecting port is arranged at one of the openings. The first shell 7 is screwed to the pressure plate 1 through the opening; the second shell 8 is connected to the first shell 7, the sliding hole is arranged in the second shell 8, and the second shell 8 is screwed to the other opening; the third shell 9 is connected to the end of the second shell 8 away from the first shell 7, and the strain gauge 3 is arranged in the third shell 9. The screw connection method of the three shells is a sealed connection. In addition, this split structure installation is easy to disassemble and assemble and it is easier to exhaust the air in the liquid storage chamber 71.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the present invention can still be modified or replaced by equivalents. Any modification or partial replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A pressure sensor, characterized in that: including elastic components; The elastic component is capable of forming a measurement area, and the elastic component comprises: A pressure plate (1), which is a base of the elastic component, the pressure plate (1) is provided with a base surface, and the projection of the measuring area perpendicular to the base surface is embedded inside the base surface; At least two sliding components are independently slidably mounted on the pressure plate (1) in a direction perpendicular to the base surface, the projection of the sliding components perpendicular to the base surface forming the measurement area, the sliding components extending out of the pressure plate (1) to the outermost end can form a test surface within the measurement area, and the end of the sliding components away from the test surface penetrates the pressure plate (1) and forms a through hole in the pressure plate (1); A movement monitoring unit, which corresponds to the sliding component one by one, and is used to monitor the movement of the sliding component; The mobile monitoring unit comprises: A first contact (5) arranged on the sliding component; A second contact point (6) arranged on the pressure plate (1); When the sliding component extends out of the pressure plate (1) to the outermost end, the first contact point (5) and the second contact point (6) contact each other, and; A signal receiving unit, which is electrically connected to the mobile monitoring unit and is used to receive an electrical signal sent by the mobile monitoring unit; The pressure sensor also includes: A supporting component, which is provided with a connection port connected to the pressure-bearing plate (1), and is sealedly connected to a side of the pressure-bearing plate (1) close to the through hole through the connection port; A liquid storage cavity (71) is arranged in the supporting component, the sliding component can extend into the liquid storage cavity (71), and when the sliding component extends into the liquid storage cavity (71), the shape of the liquid storage cavity (71) can be changed according to the extension amount of the sliding component; A strain gauge (3) disposed inside the supporting component, the strain gauge (3) being capable of deforming according to a change in the shape of the liquid storage cavity (71); The supporting member comprises: a sliding hole, which is in communication with the liquid storage chamber (71); A sliding rod (4) is slidably mounted in the sliding hole, one end of the sliding rod (4) is sealingly connected to the liquid storage chamber (71), and the other end of the sliding rod (4) is connected to the strain gauge (3); The support member further comprises: A first shell (7) which is sealed and connected to the pressure-bearing plate (1), and the liquid storage chamber (71) is arranged inside the first shell (7); A second shell (8) connected to the first shell (7), wherein the sliding hole is arranged in the second shell (8); The third housing (9) is connected to an end of the second housing (8) away from the first housing (7), and the strain gauge (3) is arranged in the third housing (9).

2. A pressure sensor according to claim 1, characterized in that: The sliding component comprises: A rod-shaped object (2), one end of which is inserted into the interior of the pressure plate (1), and the other end of which extends out of the base surface to form a test surface; A force-applying component is installed inside the pressure-bearing plate (1) and is capable of applying a thrust force to the rod-shaped object (2) to slide outward.

3. A pressure sensor according to claim 1, characterized in that: A sealing gasket is provided between each sliding component and the through hole.

4. A pressure sensor according to claim 1, characterized in that: The aperture of the sliding hole is smaller than the chamber cross section of the liquid storage chamber (71).

5. A pressure sensor according to claim 1, characterized in that: An elastic body is provided inside the sliding hole, and the elastic body applies an elastic force to the sliding rod (4).

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