CN113063540A - Pressure sensor based on magnetic liquid - Google Patents
Pressure sensor based on magnetic liquid Download PDFInfo
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- CN113063540A CN113063540A CN202110180799.7A CN202110180799A CN113063540A CN 113063540 A CN113063540 A CN 113063540A CN 202110180799 A CN202110180799 A CN 202110180799A CN 113063540 A CN113063540 A CN 113063540A
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- magnetic liquid
- magnetic
- liquid
- magnet
- pressure sensor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/14—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means involving the displacement of magnets, e.g. electromagnets
Abstract
The invention relates to a pressure sensor based on magnetic liquid, which comprises a container, the magnetic liquid, a magnet and a pressure part, wherein the container is provided with a magnetic liquid inlet and a magnetic liquid outlet; the magnetic liquid is arranged in the container; the magnet floats on the magnetic liquid level; the pressure part is arranged on one side of the magnet, which is far away from the magnetic liquid. The invention utilizes the second-order buoyancy principle, the liquid level rising heights of the magnetic liquid are different when the external pressure is different, the measurement of the external pressure can be realized through the different rising heights of the liquid level of the magnetic liquid, and the pressure measurement has high accuracy and good sensitivity.
Description
Technical Field
The invention relates to the technical field of pressure detection, in particular to a pressure sensor based on magnetic liquid.
Background
A Pressure Transducer is a device or apparatus that senses a Pressure signal and converts the Pressure signal into a usable output electrical signal according to a certain rule. A pressure sensor is usually composed of a pressure sensitive element and a signal processing unit. Pressure sensors can be classified into gauge pressure sensors, differential pressure sensors, and absolute pressure sensors according to different types of test pressures. The traditional pressure sensor mainly uses a mechanical structure type device, and uses the deformation of an elastic element to indicate pressure, but the structure has large size, heavy mass and low precision.
Disclosure of Invention
The invention aims to provide a pressure sensor based on magnetic liquid so as to improve the pressure detection accuracy.
In order to achieve the purpose, the invention provides the following scheme:
a magnetic liquid-based pressure sensor comprising a container, a magnetic liquid, a magnet, and a pressure portion;
the magnetic liquid is arranged in the container;
the magnet floats on the magnetic liquid level;
the pressure part is arranged on one side of the magnet, which is far away from the magnetic liquid.
Optionally, the magnetic liquid-based pressure sensor further comprises a magnetic field generator, the magnetic field generated by the magnetic field generator acting on the magnetic liquid.
Optionally, a side of the magnet in contact with the liquid surface of the magnetic liquid is rough.
Optionally, a triangular protrusion is arranged on one side of the magnet, which is in contact with the liquid level of the magnetic liquid.
Optionally, the triangular protrusions face both sides of the magnet.
Optionally, the container is a transparent container.
Optionally, a visible window is disposed on a side wall of the container.
Optionally, the container and the pressure part form a closed cavity.
Optionally, the closed cavity is a rectangular parallelepiped cavity.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention discloses a pressure sensor based on magnetic liquid, which comprises a container, the magnetic liquid, a magnet and a pressure part, wherein the container is filled with the magnetic liquid; the magnetic liquid is arranged in the container; the magnet floats on the magnetic liquid level; the pressure part is arranged on one side of the magnet, which is far away from the magnetic liquid. The invention utilizes the second-order buoyancy principle, the liquid level rising heights of the magnetic liquid are different when the external pressure is different, the measurement of the external pressure can be realized through the different rising heights of the liquid level of the magnetic liquid, and the pressure measurement has high accuracy and good sensitivity.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a structural diagram of a magnetic liquid-based pressure sensor provided by an embodiment of the present invention;
FIG. 2 is a first schematic view of a triangular protrusion structure provided in an embodiment of the present invention;
fig. 3 is a schematic diagram of a triangular protrusion structure provided in the embodiment of the present invention.
Description of the symbols:
1-container, 2-magnetic liquid, 3-magnet, 4-pressure part, 5-visual window, 6-triangular protrusion.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first," "second," "third," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the objects so described are interchangeable under appropriate circumstances. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.
In the present disclosure, the drawings discussed below and the embodiments used to describe the principles of the present disclosure are for illustration purposes only and should not be construed to limit the scope of the present disclosure. Those skilled in the art will understand that the principles of the present invention may be implemented in any suitably arranged system. Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. Further, a terminal according to an exemplary embodiment will be described in detail with reference to the accompanying drawings. Like reference symbols in the various drawings indicate like elements.
The terms used in the description of the present invention are only used to describe specific embodiments, and are not intended to show the concept of the present invention. Unless the context clearly dictates otherwise, expressions used in the singular form encompass expressions in the plural form. In the present specification, it is to be understood that terms such as "comprising," "having," and "containing" are intended to specify the presence of stated features, integers, steps, acts, or combinations thereof, as taught in the present specification, and are not intended to preclude the presence or addition of one or more other features, integers, steps, acts, or combinations thereof. Like reference symbols in the various drawings indicate like elements.
The invention aims to provide a pressure sensor based on magnetic liquid so as to improve the pressure detection accuracy.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a structural diagram of a magnetic liquid-based pressure sensor according to an embodiment of the present invention, and as shown in fig. 1, the magnetic liquid-based pressure sensor includes a container 1, a magnetic liquid 2, a magnet 3, and a pressure unit 4. The magnetic liquid 2 is arranged in the container 1, the magnet 3 floats on the liquid surface of the magnetic liquid 2, and the pressure part 4 is arranged on the side of the magnet 3 far away from the magnetic liquid 2.
First, the relevant physical principles are introduced:
first-order buoyancy: the magnetic liquid can suspend the non-magnetic substance with specific gravity larger than that of the magnetic liquid under the action of a magnetic field.
Second-order buoyancy: the magnetic liquid can suspend a permanent magnet which is immersed in the magnetic liquid and has a specific gravity larger than that of the magnetic liquid.
Archimedes' law: an object immersed in a stationary fluid is subjected to a buoyant force equal in magnitude to the weight of the fluid displaced by the object, directed vertically upward and through the centroid of the displaced fluid.
The principle of the invention is as follows:
the pressure part 4 is arranged above the magnet 3, the magnet 3 floats on the liquid level of the magnetic liquid 2, and when the external pressure presses the pressure part 4, the magnet 3 presses the magnetic liquid 2. Due to the second-order buoyancy principle, the liquid level of the magnetic liquid 2 rises, and the measurement of the external pressure can be realized through different heights of the liquid level of the magnetic liquid 2.
The magnet itself, which has a smaller weight than the magnetic liquid, will be suspended. According to the specific principle of second-order buoyancy: the magnets are immersed in the magnetic liquid and subjected to a buoyancy greater than the archimedes buoyancy, so that the magnetic liquid can suspend the magnets immersed therein and having a weight greater than that of the magnetic liquid.
In this embodiment, the magnetic liquid based pressure sensor further comprises a magnetic field generator, and a magnetic field generated by the magnetic field generator acts on the magnetic liquid 2. Namely, an external magnetism is added in the magnetic liquid 2, so that the magnetism of the magnetic liquid 2 can be enhanced, and the measuring range and the measuring sensitivity of the sensor can be increased.
In the present embodiment, the side of the magnet 3 in contact with the liquid surface of the magnetic liquid 2 is rough. The surface of the magnet 3 is rough, the second-order buoyancy effect is stronger, the error is smaller under the non-pressure effect, and the stability of the sensor is stronger. Further, a triangular protrusion 6 is arranged on one side of the magnet 3, which is in contact with the liquid surface of the magnetic liquid 2. The triangular protrusion 6 has a tip, and due to the tip effect, a stronger magnetic field can be converged at the tip of the triangular protrusion 6, so that the generated second-order buoyancy is stronger. Further, the triangular projections 6 face both sides of the magnet 3. The triangular protrusions 6 face both sides of the magnet 3, and the detection sensitivity in the pressure direction can be improved. The triangular projections 6 are configured as shown in fig. 2-3.
It can be understood that the contact area of the magnet 3 and the magnetic liquid 2 is increased, so that the liquid level of the magnetic liquid 2 can be raised to a higher height under the same pressure, and the sensor sensitivity is better.
Further, the container 1 is a transparent container. Or the side wall of the container 1 is provided with a visible window 5. The container 1 is transparent or a visible window 5 is arranged above the side wall of the container 1, so that the rising condition of the liquid level of the magnetic liquid 2 can be observed from the outside, and the measurement is convenient.
Further, the container 1 and the pressure part 4 form a closed cavity. Wherein, the closed cavity is a cuboid cavity.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides a pressure sensor based on magnetic liquid, which extrudes the magnetic liquid 2 through external pressure, improves the liquid level of the magnetic liquid 2, and realizes measurement of the external pressure through the change of the liquid level. Due to the characteristic of the second-order buoyancy principle, the magnet 3 is more stable relative to the magnetic liquid 2, influence cannot be generated due to tiny disturbance, the sensor is quick in response and strong in dynamic property, and no electric signal can be applied to an electroless environment.
The second-order buoyancy force applied to the magnet 3 in the magnetic liquid 2 changes along with the change of the distance between the magnet 3 and the container wall, so that the pressure sensor can also detect the pressure direction.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to assist in understanding the core concepts of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (9)
1. A magnetic liquid-based pressure sensor, characterized in that the magnetic liquid-based pressure sensor comprises a container, a magnetic liquid, a magnet, and a pressure part;
the magnetic liquid is arranged in the container;
the magnet floats on the magnetic liquid level;
the pressure part is arranged on one side of the magnet, which is far away from the magnetic liquid.
2. The magnetic-liquid based pressure sensor of claim 1, further comprising a magnetic field generator, wherein the magnetic field generated by the magnetic field generator acts on the magnetic liquid.
3. The magnetic-fluid-based pressure sensor of claim 1, wherein a side of the magnet in contact with a surface of the magnetic fluid is roughened.
4. The magnetic-liquid-based pressure sensor according to claim 1, wherein a triangular protrusion is provided on a side of the magnet that is in contact with a liquid surface of the magnetic liquid.
5. The magnetic-fluid-based pressure sensor of claim 4, wherein the triangular protrusions are directed toward both sides of the magnet.
6. The magnetic liquid-based pressure sensor of claim 1, wherein the container is a transparent container.
7. The magnetic liquid-based pressure sensor according to claim 1, wherein a visible window is opened on a side wall of the container.
8. The magnetic liquid-based pressure sensor of claim 1, wherein the container and the pressure portion constitute a closed cavity.
9. The magnetic liquid-based pressure sensor according to claim 8, wherein the closed cavity is a rectangular parallelepiped cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110180799.7A CN113063540A (en) | 2021-02-08 | 2021-02-08 | Pressure sensor based on magnetic liquid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110180799.7A CN113063540A (en) | 2021-02-08 | 2021-02-08 | Pressure sensor based on magnetic liquid |
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| Publication Number | Publication Date |
|---|---|
| CN113063540A true CN113063540A (en) | 2021-07-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110180799.7A Withdrawn CN113063540A (en) | 2021-02-08 | 2021-02-08 | Pressure sensor based on magnetic liquid |
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| CN (1) | CN113063540A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114838791A (en) * | 2022-04-01 | 2022-08-02 | 浙江筑工科技有限公司 | High-precision warehousing raw material weighing machine for producing assembly type prefabricated parts |
-
2021
- 2021-02-08 CN CN202110180799.7A patent/CN113063540A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114838791A (en) * | 2022-04-01 | 2022-08-02 | 浙江筑工科技有限公司 | High-precision warehousing raw material weighing machine for producing assembly type prefabricated parts |
| CN114838791B (en) * | 2022-04-01 | 2023-07-25 | 浙江筑工科技有限公司 | High-precision warehousing raw material weighing machine for producing prefabricated parts |
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Application publication date: 20210702 |
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| WW01 | Invention patent application withdrawn after publication |