Composite material rotor with electrostatic discharge function, preparation method and discharge method

Abstract

This invention discloses a method for preparing a composite material rotor with electrostatic discharge (ESD) function: 1. Fabricating a composite material rotor, applying adhesive to the surface of the composite material rotor, and attaching ESD material, followed by high-temperature curing, polishing, cleaning, and drying of the ESD material, and then spraying a primer onto the rotor surface; 2. Installing semiconductor protective devices and metal discharge needles on the rotor obtained in step 1, followed by spraying a topcoat onto the rotor surface, and finally drying, polishing, and grinding. This invention also discloses the prepared composite material rotor with ESD function, and a method for performing ESD using the composite material rotor with ESD function. The method for preparing a composite material rotor with ESD function provided by this invention effectively releases the static charge generated by the rotor of a propeller aircraft during high-speed operation, solving the problem of electrostatic discharge damage to aircraft electrical equipment caused by accumulated static charge.

Description

Technical Field

[0001] This invention belongs to the field of rotor preparation technology with electrostatic discharge function, specifically relating to a method for preparing a composite material rotor with electrostatic discharge function. This invention also relates to a composite material rotor with electrostatic discharge function prepared by the above preparation method and a method for electrostatic discharge of the composite material rotor. Background Technology

[0002] With the development of low-altitude electric vertical takeoff and landing (EVTOL) aircraft, more and more multi-rotor manned aircraft are using small propeller materials as their lift-generating devices. Furthermore, the number of propellers on the aircraft body is no longer limited to one or two pairs; large EVTOL aircraft can have six or more pairs of propellers. The specifications of the propellers also vary, with differences in size and shape.

[0003] Static electricity is generated by friction between the air and the air. When an airplane is flying, due to its high speed and prolonged friction with the air, static charge can easily accumulate, causing the static voltage to gradually increase. Once a certain voltage is reached, the static electricity can be released into the aircraft through insulation breakdown or other means, causing damage to electrical equipment due to electrostatic discharge.

[0004] Aircraft rotors are generally made of composite materials, primarily to reduce weight. Composite materials also possess certain fatigue resistance properties, thus increasing rotor reliability. During flight, the rotor speed is determined by the aircraft's operating conditions. High-speed rotor rotation generates static electricity through friction with the air. Composite materials have relatively low conductivity, making it impossible to quickly dissipate this static charge using current traditional rotor designs. Theoretically, the higher the propeller speed, the faster static charge is generated and the more it accumulates. Traditional rotors only consider flight functionality and do not address static electricity discharge, leading to frequent aircraft malfunctions caused by static buildup. Therefore, how to conduct and rapidly dissipate static charge has become a challenging problem. Summary of the Invention

[0005] The first objective of this invention is to provide a method for preparing a composite material rotor with electrostatic discharge capability, which effectively releases the static charge generated by the rotor of a propeller aircraft during high-speed operation, thus solving the problem of electrostatic discharge caused by static charge accumulation, which damages the aircraft's electrical equipment.

[0006] The second objective of this invention is to provide a composite material rotor with electrostatic discharge function prepared by the above-described preparation method.

[0007] A third objective of this invention is to provide a method for electrostatic discharge of a composite material rotor using the aforementioned composite material rotor with electrostatic discharge function.

[0008] The first technical solution adopted in this invention is: a method for preparing a composite material rotor with electrostatic discharge function, the specific method of which is as follows:

[0009] Step 1: Fabricate composite rotor. Apply epoxy resin to the surface of the composite rotor and attach electrostatic discharge material. Then, cure the electrostatic discharge material at high temperature, grind and clean it. After drying, spray primer on the rotor surface.

[0010] Step 2: Install semiconductor protective devices and metal discharge needles on the composite material rotor obtained in Step 1. Then, spray topcoat on the surface of the composite material rotor. Finally, dry, polish and grind to obtain a composite material rotor with electrostatic discharge function.

[0011] The invention is further characterized by:

[0012] The specific method for step 1 is as follows:

[0013] Step 1.1: Fabricate a composite material rotor. Its outer surface does not need to be painted. The composite material is exposed. Grind and clean the surface of the composite material rotor to ensure that its surface is smooth and free of foreign objects.

[0014] Step 1.2: Divide the composite rotor into low-drag and high-drag regions: the rotor root and rotor trailing edge are low-drag regions; the middle part of the rotor is a high-drag region;

[0015] Carbon fiber cloths with different resistance values ​​are cut according to the dimensions of the high-resistance and low-resistance regions of the composite rotor. The size of the electrostatic discharge material needs to cover the entire outer surface of the composite rotor.

[0016] Step 1.3: Apply epoxy resin adhesive to the surface of the composite rotor, covering the tip of the entire composite rotor.

[0017] Step 1.4: After the epoxy resin adhesive reaches the bonding condition, attach the electrostatic discharge material to the surface of the composite rotor.

[0018] Step 1.5: After the electrostatic discharge material is bonded, the electrostatic discharge material is cured at 150℃ for 2-3 hours. The cured electrostatic discharge material is then sanded, polished, and cleaned. After drying, a primer is sprayed on, and finally the primer is polished.

[0019] The specific method for step 1.4 is as follows:

[0020] Electrostatic discharge materials were bonded to the low-resistance and high-resistance regions of the composite rotor surface, respectively, so that electrostatic discharge materials with different resistance values ​​could be well bonded to the composite rotor surface, and the low-resistance and high-resistance materials could be well aligned in adjacent regions.

[0021] Electrostatic discharge material needs to be bonded to both the top and bottom surfaces of the composite rotor, and the side edges of the composite rotor are also wrapped with electrostatic discharge material.

[0022] The primer is made of insulating material.

[0023] The specific method for step 2 is as follows:

[0024] Step 2.1: Make equidistant openings on the composite rotor, with the opening depth extending into the interior of the carbon fiber material used for electrostatic discharge. The depth is below the surface of the carbon fiber material but does not exceed the bottom surface of the carbon fiber material. Install semiconductor protection devices inside the openings and fix them with epoxy resin adhesive.

[0025] Step 2.2: Drill a hole at the trailing edge of the rotor, at a distance from the rotor tip, and then install the metal discharge needle by bonding it with conductive adhesive.

[0026] The tip of the metal discharge needle is designed with a window at the position adjacent to the outer surface of the composite rotor, and the tip of the metal discharge needle is flush with the surface of the flange.

[0027] Step 2.3: After fixing the semiconductor protective device, spray the surface of the composite material rotor with a topcoat. The topcoat should be a conductive type.

[0028] Step 2.4: After the topcoat is applied, the device is dried, polished, and sanded to complete the preparation of the composite material rotor device with electrostatic discharge function.

[0029] The semiconductor protective device is a varistor with a structure in which the top and bottom surfaces are conductive and the side surface is insulating. The semiconductor protective device is installed between the electrostatic discharge material and the topcoat, and the upper surface of the semiconductor protective device is higher than the upper surface of the primer.

[0030] The semiconductor protection device is a semiconductor discharge tube with a protection voltage of 400V.

[0031] The second technical solution adopted in this invention is: a composite material rotor with electrostatic discharge function prepared according to the above preparation method, comprising a rotor composite material layer, wherein an electrostatic discharge material layer, a rotor primer layer, and a rotor topcoat layer are sequentially adhered to the outer side of the rotor composite material layer;

[0032] It also includes a semiconductor protective device, which is located between the electrostatic discharge material layer and the rotor paint layer on the composite material rotor. The lower end face of the semiconductor protective device is located inside the electrostatic discharge material layer, and the upper end face of the semiconductor protective device is located inside the rotor paint layer.

[0033] Several metal discharge needles are also provided at the trailing edge of the composite rotor, at a distance from the rotor tip.

[0034] The third technical solution adopted in this invention is: a method for discharging a composite material rotor with electrostatic discharge function, using the aforementioned composite material rotor with electrostatic discharge function, and the specific method is as follows:

[0035] When a large amount of static charge accumulates on the outer surface of the composite rotor, the semiconductor protection device will turn on instantly, guiding the static charge on the outer surface of the composite rotor into the electrostatic discharge material inside the rotor. The electrostatic discharge material makes conductive contact with the metal discharge needle, and the static electricity is released into the air through the metal discharge needle.

[0036] The invention is further characterized by:

[0037] The specific method for releasing static electricity into the air using a metal discharge needle is as follows:

[0038] The charge on the outer surface of the composite rotor is collected through the low-resistance region to the position of the metal discharge needle, thereby achieving discharge. The charge flow capacity of the high-resistance region is weak, and the charge flows to the low-resistance region to achieve charge collection, thereby increasing the discharge voltage and realizing the function of electrostatic discharge to the air.

[0039] When the static charge on the rotor tip accumulates to a certain level, it can be discharged through the discharge material in the low-resistivity region to the metal discharge needle.

[0040] The beneficial effects of this invention are:

[0041] (1) The present invention includes a design method for a composite material rotor with electrostatic discharge function, which has electrostatic discharge capability and can slowly release the static charge generated by friction between the composite material rotor and the air, thereby balancing the amount of static charge and voltage on the rotor, avoiding the insulation breakdown caused by excessive static accumulation, and protecting the aircraft's electrical and electronic equipment from damage.

[0042] (2) Traditional rotors do not consider the problem of electrostatic deposition and do not have the function of electrostatic discharge. The preparation method of the composite material rotor with electrostatic discharge function of the present invention takes into account electrostatic protection and needs to optimize the design of traditional rotors. Based on the composite material rotor, electrostatic discharge material is coated and pasted on the surface of the composite material to form an electrostatic discharge layer. Then, metal discharge needles are designed according to the structural features of the rotor. The static charge is released into the air through the position of the metal discharge needles. Considering that the outer surface of the coating material will be painted, in order to avoid the voltage difference of static electricity between the painted surface and the internal electrostatic discharge material, a semiconductor discharge device is added between the two layers to balance the static charge, thereby effectively releasing the static charge. Attached Figure Description

[0043] Figure 1 This is a flowchart illustrating the manufacturing process of the composite material rotor with electrostatic discharge function according to the present invention.

[0044] Figure 2 This is a schematic diagram of the overall structure of the composite material rotor device with electrostatic discharge function of the present invention;

[0045] Figure 3 This is a schematic diagram illustrating the structural division of the high-resistance and low-resistance regions of the composite material rotor with electrostatic discharge function according to the present invention.

[0046] Figure 4 This is a schematic diagram of the composite material rotor with electrostatic discharge function of the present invention before the addition of semiconductor protection devices;

[0047] Figure 5 This is a schematic diagram of the composite material rotor with electrostatic discharge function of the present invention after adding semiconductor protection devices;

[0048] Figure 6 This is a schematic diagram illustrating the working principle of the composite material rotor semiconductor protection device with electrostatic discharge function of the present invention.

[0049] In the figure, 1. Semiconductor protective device; 2. Metal discharge needle; 3. Rotor composite material layer; 4. Electrostatic discharge material layer; 5. Rotor primer layer; 6. Rotor topcoat layer. Detailed Implementation

[0050] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0051] The main purpose of this invention is to effectively release the static charge generated by the rotor of a propeller aircraft during high-speed operation, and to prevent the accumulation of static charge from causing electrostatic discharge that could damage the aircraft's electrical and electronic equipment.

[0052] The present invention relates to a method for preparing a composite material rotor with electrostatic discharge function, such as... Figure 1 As shown, the specific method is as follows:

[0053] Step 1: Fabricate composite rotors, such as... Figure 2 As shown, epoxy resin adhesive is applied to the surface of the composite rotor, and electrostatic discharge material is attached. Then, the epoxy resin electrostatic discharge material is cured at high temperature, polished, cleaned, and dried before a primer is sprayed onto the rotor surface.

[0054] The composite material in the composite rotor of this invention refers to a composite material composed of carbon fiber, epoxy resin matrix, and additives such as glass fiber. This material is known in the field and is not the focus of this invention; therefore, it will not be described further here.

[0055] The specific method for step 1 is as follows:

[0056] Step 1.1: Fabricate a composite material rotor. Its outer surface does not need to be painted. The composite material is exposed. Grind and clean the surface of the composite material rotor to ensure that its surface is smooth and free of foreign objects.

[0057] Step 1.2: Divide the composite rotor into low-drag and high-drag regions: the rotor root and trailing edge are the low-drag region; the middle part of the rotor is the high-drag region, such as... Figure 3 As shown; the rotor root has low resistance, which is conducive to the conduction of static charge; the middle part of the rotor has high resistance, which is the area where static electricity accumulates and forms a high-impedance path for electrostatic discharge; the trailing edge of the rotor has low resistance, which is conducive to the rapid flow of static charge to the metal discharge needle, and thus release at the tip of the metal discharge needle.

[0058] Carbon fiber cloths with different resistance values ​​are cut according to the dimensions of the high-resistance and low-resistance regions of the composite rotor. The size of the electrostatic discharge material needs to cover the entire outer surface of the composite rotor.

[0059] The electrostatic discharge materials used in the low-resistance region and the high-resistance region are the same. However, the composition ratio is adjusted according to the low-resistance region and the high-resistance region to obtain electrostatic discharge materials with different resistance values. The high-resistance region is about GΩ and the low-resistance region is about MΩ. Since the electrostatic discharge materials are known technology, they will not be described in detail here.

[0060] Step 1.3: Apply epoxy resin adhesive to the surface of the composite rotor, covering the tip of the entire composite rotor.

[0061] Step 1.4: After the epoxy resin adhesive reaches the bonding condition, attach the electrostatic discharge material to the surface of the composite rotor. The specific method is as follows:

[0062] Electrostatic discharge materials were bonded to the low-resistance and high-resistance regions on the surface of the composite rotor, respectively, so that electrostatic discharge materials with different resistance values ​​could be well bonded to the surface of the composite rotor, and the low-resistance and high-resistance materials could be well aligned in adjacent regions, avoiding the phenomenon of discontinuous bonding.

[0063] Electrostatic discharge material needs to be bonded to both the top and bottom surfaces of the composite rotor, and the side edges of the composite rotor are also wrapped with electrostatic discharge material.

[0064] Step 1.5: After the electrostatic discharge material is bonded, it is cured at 150℃ for 2-3 hours. After curing, it is integrated with the composite material and is not easy to delaminate or fall off during long-term operation. The cured electrostatic discharge material is then ground, polished, and cleaned. After drying, a primer is sprayed on, and finally the primer is polished.

[0065] In this invention, the primer is made of insulating material, which hinders the discharge of static charge. In order to prevent the static charge on the rotor surface from being unable to be discharged through the metal discharge needle, a semiconductor protective device is connected to ensure that the electrostatic discharge material and the topcoat are electrically conductive.

[0066] Step 2: Install semiconductor protective devices and metal discharge needles on the composite material rotor obtained in Step 1. Then, spray topcoat on the surface of the composite material rotor. Finally, dry, polish and grind to obtain a composite material rotor with electrostatic discharge function.

[0067] The specific method is as follows:

[0068] Step 2.1: Drill holes in the composite rotor. Figure 3 At the indicated location, equidistant openings are made, with the opening depth extending into the interior of the carbon fiber material used for electrostatic discharge. The depth is below the surface of the carbon fiber material but does not exceed the bottom surface of the carbon fiber material. Semiconductor protection devices are installed inside the openings and fixed with epoxy resin adhesive.

[0069] The semiconductor protective device is a varistor with a structure where the top and bottom surfaces are conductive and the side surface is insulating. The semiconductor protective device is mounted between the electrostatic discharge material and the topcoat, with the top surface of the semiconductor protective device protruding above the top surface of the primer. Figure 4 , 5 As shown.

[0070] The semiconductor protection device is a semiconductor discharge tube with a protection voltage of 400V. Before the voltage drops below the turn-on voltage across the semiconductor protection device, its characteristics can be equivalent to a resistance in the MΩ range, with a leakage current in the microampere range. It has a certain conductivity for static charge. Its schematic diagram is shown below. Figure 6 As shown.

[0071] Step 2.2: Drill a hole at the trailing edge of the rotor, at a distance from the rotor tip, and then install the metal discharge needle by bonding it with conductive adhesive.

[0072] Composite rotor tips have high linear velocity and generate a lot of static charge. Since this is the location where static electricity is generated, setting a discharge point at this location may cause poor discharge. Therefore, the metal discharge needle is designed to be positioned towards the trailing edge, maintaining a distance from the rotor tip. When the static charge on the rotor tip accumulates to a certain level, it can flow through the low-resistivity discharge material to the metal discharge needle, further dissipating the static charge on the tip.

[0073] The tip of the metal discharge needle is designed with a window at the position adjacent to the outer surface of the composite rotor, and the tip of the metal discharge needle is flush with the surface of the flange.

[0074] The tip of the metal discharge needle is designed with a window at the position adjacent to the outer surface of the rotor, and the tip is flush with the surface to ensure the effectiveness of tip discharge.

[0075] Step 2.3: After fixing the semiconductor protective device, spray the surface of the composite material rotor with a topcoat. The topcoat should be a conductive type to ensure good conductivity between the electrodes of the semiconductor protective device and the conductive paint.

[0076] Step 2.4: After the topcoat is applied, the device is dried, polished, and sanded to complete the preparation of the composite material rotor device with electrostatic discharge function.

[0077] The composite material rotor with electrostatic discharge function prepared according to the above preparation method includes a rotor composite material layer 3, and an electrostatic discharge material layer 4, a rotor primer layer 5, and a rotor topcoat layer 6 are sequentially adhered to the outside of the rotor composite material layer 3.

[0078] It also includes a semiconductor protective device 1, which is located between the electrostatic discharge material layer 4 and the rotor paint layer 6 on the composite material rotor. The lower end face of the semiconductor protective device 1 is located inside the electrostatic discharge material layer 4, and the upper end face of the semiconductor protective device 1 is located inside the rotor paint layer 6.

[0079] Several metal discharge needles 2 are also provided at the trailing edge of the composite rotor, at a distance from the rotor tip.

[0080] A method for discharging a composite material rotor with electrostatic discharge capability, using the aforementioned composite material rotor with electrostatic discharge capability, is as follows:

[0081] When a large amount of static charge accumulates on the outer surface of the composite rotor, the semiconductor protection device will turn on instantly, guiding the static charge on the outer surface of the composite rotor into the electrostatic discharge material inside the rotor. The electrostatic discharge material makes conductive contact with the metal discharge needle, and the static electricity is released into the air through the metal discharge needle.

[0082] The specific method for releasing static electricity into the air using a metal discharge needle is as follows:

[0083] The charge on the outer surface of the composite rotor is collected through the low-resistance region to the position of the metal discharge needle, thereby achieving discharge. The charge flow capacity of the high-resistance region is weak, and the charge flows to the low-resistance region to achieve charge collection, thereby increasing the discharge voltage and realizing the function of electrostatic discharge to the air.

[0084] When the static charge on the rotor tip accumulates to a certain level, it can be discharged through the discharge material in the low-resistivity region to the metal discharge needle.

[0085] Example 1

[0086] This embodiment describes the preparation method of a composite material rotor with electrostatic discharge function, such as... Figure 1 The specific method is as follows:

[0087] Step 1: Fabricate composite rotor. Apply epoxy resin to the surface of the composite rotor and attach electrostatic discharge material. Then, cure the electrostatic discharge material at high temperature, grind and clean it. After drying, spray primer on the rotor surface.

[0088] Step 2: Install semiconductor protective devices and metal discharge needles on the composite material rotor obtained in Step 1. Then, spray topcoat on the surface of the composite material rotor. Finally, dry, polish and grind to obtain a composite material rotor with electrostatic discharge function.

[0089] Example 2

[0090] The method for preparing the composite material rotor with electrostatic discharge function in this embodiment is based on Example 1, and the specific method of step 1 is as follows:

[0091] Step 1.1: Fabricate a composite material rotor. Its outer surface does not need to be painted. The composite material is exposed. Grind and clean the surface of the composite material rotor to ensure that its surface is smooth and free of foreign objects.

[0092] Step 1.2: Divide the composite rotor into low-drag and high-drag regions: the rotor root and trailing edge are the low-drag region; the middle part of the rotor is the high-drag region, such as... Figure 3 As shown; the rotor root has low resistance, which is conducive to the conduction of static charge; the middle part of the rotor has high resistance, which is the area where static electricity accumulates and forms a high-impedance path for electrostatic discharge; the trailing edge of the rotor has low resistance, which is conducive to the rapid flow of static charge to the metal discharge needle, and thus release at the tip of the metal discharge needle.

[0093] Carbon fiber cloths with different resistance values ​​are cut according to the dimensions of the high-resistance and low-resistance regions of the composite rotor. The size of the electrostatic discharge material needs to cover the entire outer surface of the composite rotor.

[0094] The electrostatic discharge materials used in the low-resistance region and the high-resistance region are the same. However, the composition ratio is adjusted according to the low-resistance region and the high-resistance region to obtain electrostatic discharge materials with different resistance values. The high-resistance region is about GΩ and the low-resistance region is about MΩ. Since the electrostatic discharge materials are known technology, they will not be described in detail here.

[0095] Step 1.3: Apply epoxy resin adhesive to the surface of the composite rotor, covering the tip of the entire composite rotor.

[0096] Step 1.4: After the epoxy resin adhesive reaches the bonding condition, attach the electrostatic discharge material to the surface of the composite rotor. The specific method is as follows:

[0097] Electrostatic discharge materials were bonded to the low-resistance and high-resistance regions on the surface of the composite rotor, respectively, so that electrostatic discharge materials with different resistance values ​​could be well bonded to the surface of the composite rotor, and the low-resistance and high-resistance materials could be well aligned in adjacent regions, avoiding the phenomenon of discontinuous bonding.

[0098] Electrostatic discharge material needs to be bonded to both the top and bottom surfaces of the composite rotor, and the side edges of the composite rotor are also wrapped with electrostatic discharge material.

[0099] Step 1.5: After the electrostatic discharge material is bonded, it is cured at 150℃ for 2-3 hours. After curing, it is integrated with the composite material and is not easy to delaminate or fall off during long-term operation. The cured electrostatic discharge material is then ground, polished, and cleaned. After drying, a primer is sprayed on, and finally the primer is polished.

[0100] In this invention, the primer is made of insulating material, which hinders the discharge of static charge. In order to prevent the static charge on the rotor surface from being unable to be discharged through the metal discharge needle, a semiconductor protective device is connected to ensure that the electrostatic discharge material and the topcoat are electrically conductive.

[0101] Example 3

[0102] The method for preparing the composite material rotor with electrostatic discharge function in this embodiment is based on Example 1, and the specific method of step 2 is as follows:

[0103] Step 2.1: Drill holes in the composite rotor. Figure 3 At the indicated location, equidistant openings are made, with the opening depth extending into the interior of the carbon fiber material used for electrostatic discharge. The depth is below the surface of the carbon fiber material but does not exceed the bottom surface of the carbon fiber material. Semiconductor protection devices are installed inside the openings and fixed with epoxy resin adhesive.

[0104] Step 2.2: Drill a hole at the trailing edge of the rotor, at a distance from the rotor tip, and then install the metal discharge needle by bonding it with conductive adhesive.

[0105] Composite rotor tips have high linear velocity and generate a lot of static charge. Since this is the location where static electricity is generated, setting a discharge point at this location may cause poor discharge. Therefore, the metal discharge needle is designed to be positioned towards the trailing edge, maintaining a distance from the rotor tip. When the static charge on the rotor tip accumulates to a certain level, it can flow through the low-resistivity discharge material to the metal discharge needle, further dissipating the static charge on the tip.

[0106] The tip of the metal discharge needle is designed with a window at the position adjacent to the outer surface of the composite rotor, and the tip of the metal discharge needle is flush with the surface of the flange.

[0107] The tip of the metal discharge needle is designed with a window at the position adjacent to the outer surface of the rotor, and the tip is flush with the surface to ensure the effectiveness of tip discharge.

[0108] Step 2.3: After fixing the semiconductor protective device, spray the surface of the composite material rotor with a topcoat. The topcoat should be a conductive type to ensure good conductivity between the electrodes of the semiconductor protective device and the conductive paint.

[0109] Step 2.4: After the topcoat is applied, the device is dried, polished, and sanded to complete the preparation of the composite material rotor device with electrostatic discharge function.

[0110] Example 4

[0111] This embodiment describes a method for preparing a composite material rotor with electrostatic discharge functionality. Building upon Embodiment 3, the semiconductor protective device is a varistor with a structure where the top and bottom surfaces are conductive, and the side surface is insulating. The semiconductor protective device is installed between the electrostatic discharge material and the topcoat, with the upper surface of the semiconductor protective device higher than the upper surface of the primer. Figure 4 , 5 As shown.

[0112] The semiconductor protection device is a semiconductor discharge tube with a protection voltage of 400V. Before the voltage drops below the turn-on voltage across the semiconductor protection device, its characteristics can be equivalent to a resistance in the MΩ range, with a leakage current in the microampere range. It has a certain conductivity for static charge. Its schematic diagram is shown below. Figure 6 As shown.

[0113] Example 5

[0114] This embodiment has a composite material rotor with electrostatic discharge function, including rotor composite material layer 3, and electrostatic discharge material layer 4, rotor primer layer 5, and rotor topcoat layer 6 are sequentially adhered to the outside of rotor composite material layer 3.

[0115] It also includes a semiconductor protective device 1, which is located between the electrostatic discharge material layer 4 and the rotor paint layer 6 on the composite material rotor. The lower end face of the semiconductor protective device 1 is located inside the electrostatic discharge material layer 4, and the upper end face of the semiconductor protective device 1 is located inside the rotor paint layer 6.

[0116] Several metal discharge needles are located on the trailing edge of the composite rotor, at a distance from the rotor tip.

[0117] Example 6

[0118] This embodiment describes a method for discharging a composite material rotor with electrostatic discharge capability, as follows:

[0119] When a large amount of static charge accumulates on the outer surface of the composite rotor, the semiconductor protection device will turn on instantly, guiding the static charge on the outer surface of the composite rotor into the electrostatic discharge material inside the rotor. The electrostatic discharge material makes conductive contact with the metal discharge needle, and the static electricity is released into the air through the metal discharge needle.

[0120] Example 7

[0121] The method for discharging a composite material rotor with electrostatic discharge capability in this embodiment, based on Embodiment 6, further utilizes a metal discharge needle to release static electricity into the air. The specific method is as follows:

[0122] The charge on the outer surface of the composite rotor is collected through the low-resistance region to the position of the metal discharge needle, thereby achieving discharge. The charge flow capacity of the high-resistance region is weak, and the charge flows to the low-resistance region to achieve charge collection, thereby increasing the discharge voltage and realizing the function of electrostatic discharge to the air.

[0123] When the static charge on the rotor tip accumulates to a certain level, it can be discharged through the discharge material in the low-resistivity region to the metal discharge needle.

Claims

1. A method for producing a composite rotor blade with electrostatic discharge function, characterized in that, The specific method is as follows: Step 1, making a composite rotor, coating epoxy resin glue on the surface of the composite rotor, and pasting electrostatic discharge material, then high-temperature curing, polishing, cleaning, and then spraying primer on the surface of the rotor after drying; Step 2, respectively installing semiconductor protection devices and metal discharge needles on the composite rotor obtained in step 1, then spraying topcoat on the surface of the composite rotor, and finally drying, polishing and polishing treatment, to obtain a composite rotor with electrostatic discharge function; The specific method of step 1 is as follows: Step 1.1, making a composite rotor, the outer surface of which does not need to be painted, and the composite material is exposed, polishing and cleaning the surface of the composite rotor to ensure smooth surface without foreign matter; Step 1.2, dividing the composite rotor into low resistance area and high resistance area: the root of the rotor and the trailing edge of the rotor are low resistance area; the middle part of the rotor is high resistance area; According to the size of the high resistance area and the low resistance area of the composite rotor, carbon fiber cloth with different resistance values is cut, and the size of the electrostatic discharge material needs to cover the outer surface of the entire composite rotor; Step 1.3, coating epoxy resin glue on the surface of the composite rotor, and the glue area covers all the tip parts of the composite rotor; Step 1.4, after the epoxy resin glue reaches the bonding condition, the electrostatic discharge material is pasted on the surface of the composite rotor; Step 1.5, after the electrostatic discharge material is bonded, the electrostatic discharge material is high-temperature cured at 150 DEG C for 2-3 hours, and then polished, polished and cleaned, and then primer is sprayed after drying, and finally the primer is polished and polished; The specific method of step 2 is as follows: Step 2.1, equidistantly drilling holes on the composite rotor, the drilling depth is to the inside of the carbon fiber material of the electrostatic discharge material, the depth is below the surface of the carbon fiber material, but does not exceed the bottom surface of the carbon fiber material, installing semiconductor protection devices in the holes, and fixing them with epoxy resin glue; Step 2.2, drilling holes at the trailing edge of the rotor, and then installing metal discharge needles through conductive glue bonding; The tip of the metal discharge needle is designed to be adjacent to the position adjacent to the outer surface of the composite rotor, and the tips of the metal discharge needles are flush with the surface of the flange; Step 2.3, after fixing the semiconductor protection devices, spraying topcoat on the surface of the composite rotor, and the topcoat is selected to be conductive type; Step 2.4, after the topcoat is sprayed, drying, polishing and polishing treatment are carried out, and the preparation of the composite rotor device with electrostatic discharge function is completed.

2. The method for preparing a composite material rotor with electrostatic discharge function according to claim 1, characterized in that, The specific method of step 1.4 is as follows: According to the low resistance area and high resistance area divided on the surface of the composite rotor, the electrostatic discharge material is bonded, so that the electrostatic discharge materials with different resistance values are well bonded on the surface of the composite rotor, and the low resistance material and the high resistance material are well aligned in the adjacent area; The upper and lower surfaces of the composite rotor need to be bonded with electrostatic discharge material, and the side edge position of the composite rotor is also wrapped with electrostatic discharge material.

3. The method for preparing a composite material rotor with electrostatic discharge function according to claim 1, characterized in that, The primer is selected to be insulating material.

4. The method for preparing a composite material rotor with electrostatic discharge function according to claim 1, characterized in that, The semiconductor protection device is a pressure sensitive resistor, and the structure is that the upper and lower surfaces are conductive surfaces, and the side surface is an insulating surface.

5. The method for preparing a composite material rotor with electrostatic discharge function according to claim 1, characterized in that, The semiconductor protection device is a semiconductor discharge tube, and the protection voltage is 400V.

6. The composite rotor blade with electrostatic discharge function prepared by the method according to any one of claims 1-5, characterized in that, The rotor composite material layer (3) is sequentially adhered with an electrostatic discharge material layer (4), a rotor primer layer (5) and a rotor topcoat layer (6) from outside. The semiconductor protection device (1) is arranged between the electrostatic discharge material layer (4) and the rotor topcoat layer (6) of the composite material rotor, the lower end surface of the semiconductor protection device (1) is located in the electrostatic discharge material layer (4), and the upper end surface of the semiconductor protection device (1) is located in the rotor topcoat layer (6). The composite material rotor is further provided with a plurality of metal discharge needles (2) at positions away from the trailing edge and the rotor tip.

7. A method of discharging a composite rotor with electrostatic discharge function, characterized in that, The composite material rotor with the electrostatic discharge function is used according to the method of claim 6. When the electrostatic charge on the outer surface of the composite material rotor accumulates, the semiconductor protection device is opened instantaneously, the electrostatic charge on the outer surface of the composite material rotor is guided into the electrostatic discharge material in the rotor, the electrostatic discharge material is conductively connected with the metal discharge needle, and the electrostatic charge is discharged into the air through the metal discharge needle.

8. The method of claim 7, wherein the composite material rotor is discharged by static electricity, characterized by, The electrostatic charge is discharged into the air through the metal discharge needle according to the following method. The electrostatic charge on the outer surface of the composite material rotor is gathered to the position of the metal discharge needle through the low-resistance area, so that the discharge is realized, the charge flow capacity of the high-resistance area is weak, the charge flows to the low-resistance area, the gathering of the charge is realized, the discharge voltage is improved, and the electrostatic discharge function to the air is realized. When the electrostatic charge on the rotor tip accumulates to a certain degree, the electrostatic charge on the rotor tip can be discharged through the low-resistance discharge material flowing to the metal discharge needle.

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