阅读说明：本技术 一种空化在线监测装置 (Cavitation on-line monitoring device ) 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,具体提供了一种空化在线监测装置,包括石墨烯层、源极、漏极、电负性材料部、电正性材料部,源极和漏极置于石墨烯层的两端,电负性材料部固定在石墨烯层上,电负性材料部不与源极或漏极接触,电正性材料部置于电负性材料部上,电正性材料部和电负性材料部的边缘粘合。通过探测石墨烯层的导电特性实现对文丘里管内空化的实时监测。因为石墨烯层的导电特性对其栅极电压非常敏感,所以本发明具有灵敏度高的优点。(The invention belongs to the field of cavitation online monitoring, and particularly provides a cavitation online monitoring device which comprises a graphene layer, a source electrode, a drain electrode, an electronegative material part and an electropositive material part, wherein the source electrode and the drain electrode are arranged at two ends of the graphene layer, the electronegative material part is fixed on the graphene layer, the electronegative material part is not contacted with the source electrode or the drain electrode, the electropositive material part is arranged on the electronegative material part, and the edges of the electronegative material part and the electronegative material part are bonded. The cavitation in the Venturi tube can be monitored in real time by detecting the conductive characteristic of the graphene layer. The present invention has the advantage of high sensitivity because the conductive properties of the graphene layer are very sensitive to its gate voltage.)

1. The cavitation on-line monitoring device is characterized by comprising a graphene layer, a source electrode, a drain electrode, an electronegative material part and an electropositive material part, wherein the source electrode and the drain electrode are arranged at two ends of the graphene layer, the electronegative material part is fixed on the graphene layer, the electronegative material part is not in contact with the source electrode or the drain electrode, the electropositive material part is arranged on the electronegative material part, and the edges of the electronegative material part and the electropositive material part are bonded.

2. The cavitation on-line monitoring device of claim 1, characterized in that: the number of graphene layers in the graphene layer is greater than 1 and less than 10.

3. The cavitation on-line monitoring device of claim 2, characterized in that: holes are formed in the graphene layer.

4. The cavitation on-line monitoring device of claim 3, characterized in that: the hole is disposed on the underside of the portion of electronegative material.

5. The cavitation on-line monitoring device of claim 4, characterized in that: the electronegative material portion penetrates through the hole.

6. The cavitation on-line monitoring device as set forth in any one of claims 1 to 5, characterized in that: the material of the electropositive material portion is aluminum.

7. The cavitation on-line monitoring device of claim 6, characterized in that: the material of the electronegative material part is fluorinated ethylene propylene copolymer.

8. The cavitation on-line monitoring device of claim 7, wherein: the source electrode and the drain electrode are made of gold, silver and platinum.

Technical Field

The invention relates to the field of cavitation online monitoring, in particular to a 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 an online cavitation monitoring device which comprises a graphene layer, a source electrode, a drain electrode, an electronegative material part and an electropositive material part, wherein the source electrode and the drain electrode are arranged at two ends of the graphene layer, the electronegative material part is fixed on the graphene layer, the electronegative material part is not contacted with the source electrode or the drain electrode, the electropositive material part is arranged on the electronegative material part, and the edges of the electronegative material part and the electronegative material part are bonded.

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

Furthermore, holes are arranged in the graphene layer.

Further, the hole is disposed on the lower side of the electronegative material portion.

Further, the electronegative material portion penetrates the hole.

Further, the material of the electropositive material portion is aluminum.

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

Further, the source electrode and the drain electrode are made of gold, silver or platinum.

The invention has the beneficial effects that: the invention provides an online cavitation monitoring device which comprises a graphene layer, a source electrode, a drain electrode, an electronegative material part and an electropositive material part, wherein the source electrode and the drain electrode are arranged at two ends of the graphene layer, the electronegative material part is fixed on the graphene layer, the electronegative material part is not contacted with the source electrode or the drain electrode, the electropositive material part is arranged on the electronegative material part, and the edges of the electronegative material part and the electronegative material part are bonded. In use, the graphene layer adheres to the diverging section of the venturi to respond to vibrations within the venturi. When the fluid takes place the cavitation in the venturi, the venturi takes place the violent vibration to make electronegative material portion and electropositive material portion produce the separation, thereby produce the charge change in electronegative material portion both sides, thereby changed the grid voltage on graphite alkene layer, thereby changed the conducting property on graphite alkene layer, the change through surveying graphite alkene layer's conducting property realizes the real-time supervision to the cavitation in the venturi. The present invention has the advantage of high sensitivity because the conductive properties of the graphene layer are very sensitive to its gate voltage.

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.

Fig. 2 is a schematic diagram of another cavitation on-line monitoring device.

In the figure: 1. a venturi tube; 2. a graphene layer; 3. a source electrode; 4. a drain electrode; 5. an electronegative material portion; 6. an electropositive material portion; 7. 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 an online cavitation monitoring device, which comprises a graphene layer 2, a source electrode 3, a drain electrode 4, an electronegative material part 5 and an electropositive material part 6, as shown in figure 1. The number of layers of graphene in the graphene layer 2 is greater than 1 layer and less than 10 layers, so that the sensitivity of the conductive characteristic of the graphene layer 2 to the gate voltage of the graphene layer is ensured, that is, the sensitivity of the conductive characteristic of the graphene layer 2 to the charge change in the electronegative material part 5 is ensured. The source electrode 3 and the drain electrode 4 are disposed at both ends of the graphene layer 2 to measure the conductive characteristics of the graphene layer 2. The source electrode 3 and the drain electrode 4 are made of gold, silver or platinum. The electronegative material section 5 is fixed on the graphene layer 2, and the electronegative material section 5 is not in contact with the source electrode 3 or the drain electrode 4. In the present invention, the electronegative material part 5 is used to change the conductive characteristics of the graphene layer 2. The material of the electronegative material section 5 is a fluorinated ethylene propylene copolymer. The electropositive material portion 6 is disposed on the electronegative material portion 5, and edges of the electropositive material portion 6 and the electronegative material portion 5 are bonded. When vibrated, the central portions of the electropositive material portion 6 and the electronegative material portion 5 are separated. The material of the electropositive material portion 6 is aluminum.

In use, the graphene layer 2 adheres to the diverging section of the venturi 1 in response to vibrations within the venturi 1. The tube wall of the venturi tube 1 is made of insulating material. When the fluid in venturi 1 takes place the cavitation, venturi 1 takes place the intense vibration to make electronegative material portion 5 and 6 production separations of electropositive material portion, thereby produce the charge change in 5 both sides of electronegative material portion, the grid voltage who has changed graphite alkene layer 2 in other words, thereby changed graphite alkene layer 2's conductive property, the change through the conductive property of surveying graphite alkene layer 2 realizes the real-time supervision to the cavitation in venturi 1. The present invention has the advantage of high sensitivity because the conductive properties of the graphene layer 2 are very sensitive to its gate voltage.

In the present invention, the graphene layer 2 may be multi-layer graphene, or may be formed by stacking multi-layer graphene. Preferably, the graphene layer 2 is formed by laminating a plurality of graphene layers. Therefore, under the action of the vibration of the venturi tube 1, the relative position between the multiple layers of graphene changes, and the interfaces between the layers are changed, so that the conductive characteristics of the graphene layers 2 are changed more, and the cavitation online monitoring with higher sensitivity is realized.

Example 2

In addition to example 1, as shown in fig. 2, the graphene layer 2 is provided with holes 7. The hole 7 is placed on the underside of the portion of electronegative material 5. The electronegative material section 5 penetrates the hole. In use, the portion 5 of electronegative material of the through-going bore 7 adheres to the wall of the venturi 1. Thus, on the one hand, the graphene layer 2 has more contact area with the electronegative material part 5, and the change of the charge in the electronegative material part 5 changes the conductive characteristic of the graphene layer 2 more; on the other hand, by fixing the graphene layer 2 and the electronegative material part 5 more firmly on the tube wall of the venturi tube 1, the electronegative material part 6 can be separated more from the electronegative material part 5 when the venturi tube 1 vibrates, thereby generating a more significant charge change in the electronegative material part 5. The two effects result in more serious change of the conductivity of the graphene layer 2, so that the cavitation online detection with higher sensitivity is realized.

Further, the interface between the electropositive material portion 6 and the electronegative material portion 5 is rough. That is, at the interface of the electropositive material portion 6 and the electronegative material portion 5, both the electropositive material portion 6 and the electronegative material portion 5 have rough surfaces. As such, when the electronegative material section 5 is separated from the electropositive material section 6 by the vibration of the venturi tube 1, the electric charge in the electronegative material section 5 depends more heavily on the vibration intensity of the venturi tube 1, that is, the cavitation intensity inside the venturi tube 1, thereby achieving higher sensitivity of cavitation monitoring.

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.