阅读说明：本技术 一种基于石墨烯波导的空化在线监测装置 (Cavitation on-line monitoring device based on graphene waveguide ) 是由 不公告发明人 于 2020-12-08 设计创作，主要内容包括：本发明属于空化在线监测领域,具体提供了一种基于石墨烯波导的空化在线监测装置,包括粘附层、绝缘层、石墨烯层、电负性材料层、电正性材料层,绝缘层置于粘附层上,石墨烯层置于绝缘层上,电负性材料层固定在石墨烯层上,电正性材料层置于电负性材料层上,电正性材料层和电负性材料层的边缘粘合。本发明具有空化实时监测灵敏度高的优点。(The invention belongs to the field of cavitation online monitoring, and particularly provides a graphene waveguide-based cavitation online monitoring device which comprises an adhesion layer, an insulating layer, a graphene layer, an electronegative material layer and an electropositive material layer, wherein the insulating layer is arranged on the adhesion layer, the graphene layer is arranged on the insulating layer, the electronegative material layer is fixed on the graphene layer, the electropositive material layer is arranged on the electronegative material layer, and the edges of the electronegative material layer and the electropositive material layer are bonded. The invention has the advantage of high real-time monitoring sensitivity of cavitation.)

1. The utility model provides a cavitation on-line monitoring device based on graphite alkene waveguide which characterized in that, includes adhesion layer, insulating layer, graphite alkene layer, electronegative material layer, the electropositive material layer, the insulating layer is arranged in on the adhesion layer, graphite alkene layer is arranged in on the insulating layer, electronegative material layer is fixed on graphite alkene layer, electropositive material layer is arranged in on the electronegative material layer, electropositive material layer with the edge bonding of electronegative material layer.

2. The graphene waveguide based cavitation online monitoring device according to claim 1, characterized in that: the number of graphene layers in the graphene layer is greater than 1 and less than 10.

3. The graphene waveguide based cavitation online monitoring device according to claim 2, characterized in that: the middle part of the electropositive material layer is thick, and the edge of the electropositive material layer is thin.

4. The graphene waveguide based cavitation online monitoring device according to claim 3, wherein: the middle part of the electronegative material layer is thin, and the edge of the electronegative material layer is thick.

5. The graphene waveguide based cavitation online monitoring device according to claim 4, wherein: the interface of the electronegative material layer and the electropositive material layer is an arc surface.

6. The graphene waveguide based cavitation online monitoring device according to claim 5, wherein: the top surface of the electropositive material layer is planar.

7. The graphene waveguide based cavitation online monitoring device according to any one of claims 1 to 6, wherein: at the interface of the graphene layer and the electronegative material layer, holes are formed in the electronegative material layer, and the holes do not penetrate through the electronegative material layer.

8. The graphene waveguide based cavitation online monitoring device according to claim 7, wherein: the number of the holes is multiple.

9. The graphene waveguide based cavitation online monitoring device according to claim 8, wherein: the material of the electronegative material layer is fluorinated ethylene propylene copolymer.

10. The graphene waveguide based cavitation online monitoring device according to any one of claims 1 to 9, wherein: the material of the electropositive material layer is aluminum.

Technical Field

The invention relates to the field of cavitation online monitoring, in particular to a graphene waveguide-based cavitation online monitoring device.

Background

When the pressure within the fluid changes abruptly, bubbles form, expand and collapse rapidly in the fluid, a phenomenon known as cavitation. Cavitation causes erosion of materials, shortens the life of equipment, and creates hazards such as vibration and noise. Monitoring cavitation is important to the proper operation of the device. The traditional monitoring technology comprises a high-speed camera shooting method, a coating corrosion method, a noise measurement method and the like. The traditional cavitation monitoring technology can not realize real-time monitoring of cavitation, and in addition, the sensitivity of the traditional monitoring technology is not high.

Disclosure of Invention

In order to solve the problems, the invention provides a graphene waveguide-based cavitation online monitoring device which comprises an adhesion layer, an insulating layer, a graphene layer, an electronegative material layer and an electropositive material layer, wherein the insulating layer is arranged on the adhesion layer, the graphene layer is arranged on the insulating layer, the electronegative material layer is fixed on the graphene layer, the electropositive material layer is arranged on the electronegative material layer, and the edges of the electronegative material layer and the electropositive material layer are bonded.

Furthermore, the number of graphene layers in the graphene layer is more than 1 and less than 10.

Further, the electropositive material layer is thick in the middle and thin at the edges.

Further, the center portion of the layer of the electronegative material is thin and the edges are thick.

Furthermore, the interface of the electronegative material layer and the electropositive material layer is a cambered surface.

Further, the top surface of the electropositive material layer is planar.

Furthermore, at the interface between the graphene layer and the electronegative material layer, a hole is formed in the electronegative material layer, and the hole does not penetrate through the electronegative material layer.

Furthermore, the number of the holes is multiple.

Further, the material of the electronegative material layer is fluorinated ethylene propylene copolymer.

Still further, the material of the electropositive material layer is aluminum.

The invention has the beneficial effects that: the invention provides a graphene waveguide-based cavitation online monitoring device which comprises an adhesion layer, an insulating layer, a graphene layer, an electronegative material layer and an electropositive material layer, wherein the insulating layer is arranged on the adhesion layer, the graphene layer is arranged on the insulating layer, the electronegative material layer is fixed on the graphene layer, the electropositive material layer is arranged on the electronegative material layer, and the edges of the electronegative material layer and the electropositive material layer are bonded. In use, the adhesive layer adheres to the diverging section of the venturi in response to vibrations within the venturi. When cavitation takes place for the fluid in the venturi, strong vibration takes place for venturi to make the separation of electronegative material layer and electronegative material layer at the electronegative material layer, thereby produced the charge change on the electronegative material layer, thereby changed the dielectric constant on graphite alkene layer, thereby changed the terahertz wave propagation characteristic on graphite alkene layer, through the change of surveying graphite alkene layer terahertz wave propagation characteristic, realize the real-time supervision of cavitation in the venturi. The terahertz wave propagation characteristic of the graphene layer is very sensitive to the dielectric constant of the graphene layer, so that the device has the advantage of high cavitation real-time monitoring sensitivity.

The present invention will be described in further detail below with reference to the accompanying drawings.

Drawings

Fig. 1 is a schematic diagram of an online cavitation monitoring device based on a graphene waveguide.

Fig. 2 is a schematic diagram of another cavitation online monitoring device based on a graphene waveguide.

Fig. 3 is a schematic diagram of another cavitation online monitoring device based on a graphene waveguide.

Fig. 4 is a schematic diagram of another cavitation online monitoring device based on a graphene waveguide.

In the figure: 1. an adhesive layer; 2. an insulating layer; 3. a graphene layer; 4. a layer of an electronegative material; 5. a layer of electropositive material; 6. and (4) holes.

Detailed Description

To further explain the technical means and effects of the present invention adopted to achieve the intended purpose, the following detailed description of the embodiments, structural features and effects of the present invention will be made with reference to the accompanying drawings and examples.

Example 1

The invention provides a graphene waveguide-based cavitation online monitoring device, which comprises an adhesion layer 1, an insulating layer 2, a graphene layer 3, an electronegative material layer 4 and an electropositive material layer 5, as shown in figure 1. The insulating layer 2 is disposed on the adhesive layer 1. The material of the adhesion layer 1 is not limited, and any material capable of adhering the insulation layer 2 to the venturi tube may be used. The insulating layer 2 does not absorb or has less absorption of the terahertz wave. Preferably, the material of the insulating layer 2 is silicon dioxide. The graphene layer 3 is disposed on the insulating layer 2. The number of layers of graphene in the graphene layer 3 is greater than 1 layer and less than 10 layers, so that the sensitivity of the terahertz wave propagation characteristic of the graphene layer 3 to the gate voltage of the graphene layer is ensured, that is, the sensitivity of the terahertz wave propagation characteristic of the graphene layer 3 to the charge change in the electronegative material layer 4 is ensured. The layer of electronegative material 4 is fixed to the graphene layer 3. The material of the electronegative material layer 4 is fluorinated ethylene propylene copolymer. The layer of electropositive material 5 is disposed on the layer of electronegative material 4. The material of the electropositive material layer 5 is aluminum. The edges of the layer of electropositive material 5 and the layer of electronegative material 4 are bonded. When vibrated, the middle portions of the electropositive material layer 5 and the electronegative material layer 4 are separated.

In the present invention, the graphene layer 3 is applied as a terahertz waveguide for propagating terahertz waves. In use, the adhesive layer 1 adheres to the diverging section of the venturi in response to vibrations within the venturi. When fluid in the venturi tube cavitates, the venturi tube vibrates strongly, so that the electronegative material layer 4 is separated from the electropositive material layer 5, charge change is generated on the electronegative material layer 4, the dielectric constant of the graphene layer 3 is changed, and the terahertz wave propagation characteristic of the graphene layer 3 is changed. Specifically, the terahertz wave is coupled into one end of the graphene layer 3, and the transmitted terahertz wave is detected at the other end of the graphene layer 3, so that the terahertz wave transmission characteristic of the graphene layer 3 is determined. According to the invention, real-time monitoring of cavitation in the Venturi tube is realized by detecting the change of the transmission characteristics of the terahertz waves of the graphene layer 3. The terahertz wave propagation characteristic of the graphene layer 3 is very sensitive to the dielectric constant of the graphene layer 3, so that the device has the advantage of high cavitation real-time monitoring sensitivity.

In the invention, the vibration of the venturi tube changes the charge in the electronegative material layer 4, namely changes the grid voltage of the graphene layer 3, thereby changing the dielectric constant of the graphene layer 3; moreover, the interfaces between the graphene layer 3 and the insulating layer 2 and between the graphene layer 3 and the electronegative material layer 4 are changed, and the terahertz wave propagation characteristic of the graphene layer 3 is very sensitive to the environment of the interfaces. Both of the two aspects result in that the terahertz wave propagation characteristic of the graphene layer 3 depends on the cavitation in the venturi tube more seriously, so that the invention can realize the on-line monitoring of the cavitation with higher sensitivity.

Example 2

On the basis of example 1, as shown in fig. 2, the electropositive material layer 5 is thick in the middle and thin at the edges. That is, the electropositive material layer 5 is heavy in the middle and light at the edges. Thus, the inertia of the center portion of the electropositive material layer 5 is large. When the Venturi tube vibrates, the middle parts of the electronegative material layer 4 and the electropositive material layer 5 are separated more, so that more charges are generated on the electronegative material layer 4, the terahertz wave propagation characteristic of the graphene layer 3 is changed more, and the cavitation online monitoring with higher sensitivity is realized. When the positive electrode material layer is applied, the effect of the embodiment can be achieved by processing the middle part of the positive electrode material layer 5 into an arc-shaped bulge or arranging an additional block in the middle part of the positive electrode material layer 5. Therefore, the present embodiment has an advantage of simple manufacturing method.

Example 3

On the basis of example 1, the layer 4 of the electronegative material was thin in the middle and thick at the edges. Therefore, in the middle of the electronegative material layer 4, the charge distribution is more concentrated, which is equivalent to that the grid voltage of the graphene layer 3 is larger, and the dielectric constant of the graphene layer 3 can be changed more, so that the cavitation online monitoring with higher sensitivity is realized.

Example 4

On the basis of examples 2 to 3, as shown in fig. 3, the interface of the electropositive material layer 5 and the electronegative material layer 4 is a cambered surface. That is, the center of curvature of the camber is on the upper side of the interface. The top surface of the electropositive material layer 5 is planar. The present embodiment satisfies both the case where the middle portion of the electropositive material layer 5 is thick and the case where the middle portion of the electronegative material layer 4 is thin. Therefore, the embodiment can realize the cavitation on-line monitoring with higher sensitivity.

Example 5

On the basis of example 1, as shown in fig. 4, at the interface between the graphene layer 3 and the electronegative material layer 4, a hole 6 is provided in the electronegative material layer 4, and the hole 6 does not penetrate through the electronegative material layer 4. The number of the holes 6 is multiple. Therefore, on the surface of the graphene layer 3, the charge distribution in the electronegative material layer 4 is more concentrated, so that a stronger electric field is generated near the graphene layer 3, the terahertz wave propagation characteristic of the graphene layer 3 is changed more, and the cavitation online monitoring with higher sensitivity is realized.

The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.