Self-Rotation Graphene Heat-Dissipation Device For Direct-Drive Electro-Hydrostatic Actuator

Abstract

A self-rotation graphene heat-dissipation device for a direct-drive electro-hydrostatic actuator, that includes inner and outer walls of a shell eccentrically arranged relative to each other, the shell sleeves on an outer side of a self-rotation mechanism. The self-rotation mechanism is arranged on an outer side of a shaft; the shaft is coaxial with the inner wall of the shell and connected with outer and inner end covers. The self-rotation mechanism includes a rotor and blades, the rotor sleeves on the shaft and is connected with the outer and inner end covers. The rotor is slidably connected with the blades, and outer walls of the blades are closely attached to the inner wall of the shell. Graphene heat-dissipation layers are coated on outer walls of all of the shell, blades, the rotor, the inner and outer end covers respectively.

Claims

1. A self-rotation graphene heat-dissipation device for a direct-drive electro-hydrostatic actuator, comprising a shell, a shaft, a self-rotation mechanism an outer end cover, an inner end cover, and graphene heat-dissipation layers, wherein an inner wall and an outer wall of the shell are eccentrically arranged relative to each other, and the shell sleeves on an outer side of the self-rotation mechanism; the self-rotation mechanism is coaxially arranged on an outer side of the shaft, the shaft and the inner wall of the shell are coaxially arranged, one end of the shaft his connected with the outer end cover, and another end of the shaft is connected with the inner end cover; the self-rotation mechanism comprises a rotor and a plurality of blades, the rotor coaxially sleeves on the outer side of the shaft, two end faces of the rotor are fixedly connected with the outer end cover and the inner end cover respectively, each of the plurality of blades slidably connected with an outer wall of the rotor, and an outer wall of each of the plurality of blades is closely attached to the inner wall of the shell; and the graphene heat-dissipation layers are coated on the outer wall of the shell, the outer wall of each of the plurality of blades, the outer wall of the rotor, an outer wall of the inner end cover and an outer wall of the outer end cover, respectively.

2. The self-rotation graphene heat-dissipation device for the direct-drive electro-hydrostatic actuator according to claim 1, wherein two mounting ears are symmetrically arranged on a surface of the outer wall of the shell, which is away from the outer end cover, first bolt holes are formed in each of the two mounting ears, two oil ports are symmetrically formed in a shell body, one end of each oil port of the two oil ports penetrates through the inner wall of the shell, and another other end of the oil port penetrates through a mounting end face of the shell.

3. The self-rotation graphene heat-dissipation device for the direct-drive electro-hydrostatic actuator according to claim 2, wherein a plurality of sliding grooves are formed in the outer wall of the rotor, and one end of each of plurality of the blades is inserted into a corresponding one of the plurality of sliding grooves and elastically connected with a bottom face of the corresponding one of the plurality of sliding grooves via a spring.

4. The self-rotation graphene heat-dissipation device for the direct-drive electro-hydrostatic actuator according to claim 3, wherein an external thread is formed on the other end of the shaft, two shaft shoulders and two annular grooves are arranged on an outer wall of the shaft, the two shaft shoulders are located between the two annular grooves, the two shaft shoulders are provided with respective bearings, the two annular grooves are provided are respective check rings, the shaft is connected with the rotor via the bearings, and each of the check rings is configured for fixing a corresponding one of the bearings.

5. The self-rotation graphene heat-dissipation device for the direct-drive electro-hydrostatic actuator according to claim 4, wherein the outer end cover and the inner end cover both sleeve on the outer side of the shaft and are each provided with a plurality of sets of heat-dissipation holes, and each of the plurality of sets of heat-dissipation holes comprises a plurality of heat-dissipation holes.

6. The self-rotation graphene heat-dissipation device for the direct-drive electro-hydrostatic actuator according to claim 5, wherein a heat-dissipation pipe is arranged between each of the heat-dissipation holes in the outer end cover and a corresponding one of the heat-dissipation holes in the inner end cover.

7. The self-rotation graphene heat-dissipation device for a direct-drive electro-hydrostatic actuator according to claim 1, wherein an outer fan is arranged at an outer side of the outer end cover.

8. The self-rotation graphene heat-dissipation device for the direct-drive electro-hydrostatic actuator according to claim 2, wherein an outer fan is arranged at an outer side of the outer end cover.

9. The self-rotation graphene heat-dissipation device for the direct-drive electro-hydrostatic actuator according to claim 3, wherein an outer fan is arranged at an outer side of the outer end cover.

10. The self-rotation graphene heat-dissipation device for the direct-drive electro-hydrostatic actuator according to claim 4, wherein an outer fan is arranged at an outer side of the outer end cover.

11. The self-rotation graphene heat-dissipation device for the direct-drive electro-hydrostatic actuator according to claim 5, wherein an outer fan is arranged at an outer side of the outer end cover.

12. The self-rotation graphene heat-dissipation device for a direct-drive electro-hydrostatic actuator according to claim 6, wherein an outer fan is arranged at an outer side of the outer end cover.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0016] FIG. 1 is a three-dimensional schematic diagram of a direct-drive electro-hydrostatic actuator;

[0017] FIG. 2 is a schematic diagram of the direct-drive electro-hydrostatic actuator;

[0018] FIG. 3 is a front view of a self-rotation graphene heat-dissipation device according to the present disclosure;

[0019] FIG. 4 is a section view along line A-A of FIG. 3;

[0020] FIG. 5 is an exploded diagram of the self-rotation graphene heat-dissipation device in FIG. 3;

[0021] FIG. 6 is a front view of a shell;

[0022] FIG. 7 is a section view along line B-B of FIG. 6;

[0023] FIG. 8 is a three-dimensional schematic diagram of FIG. 6;

[0024] FIG. 9 is a three-dimensional schematic diagram of a shaft;

[0025] FIG. 10 is a front view of a self-rotation mechanism;

[0026] FIG. 11 is a section view along line C-C of FIG. 10;

[0027] FIG. 12 is a three-dimensional schematic diagram of FIG. 10;

[0028] FIG. 13 is a front view of an outer end cover;

[0029] FIG. 14 is a three-dimensional schematic diagram of FIG. 13;

[0030] FIG. 15 is a front view of an inner end cover;

[0031] FIG. 16 is a three-dimensional schematic diagram of FIG. 15;

[0032] FIG. 17 is a front view of an outer fan;

[0033] FIG. 18 is a section view along line D-D of FIG. 17;

[0034] FIG. 19 is a three-dimensional schematic diagram of FIG. 17; and

[0035] FIG. 20 is a schematic diagram of a graphene heat-dissipation layer.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] Technical solutions in the embodiments of the present disclosure will be clearly and completely described herein below with reference to the drawings in the embodiments of the present disclosure. Apparently, the described embodiments are merely a part rather than all of the embodiments of the present disclosure. Based on the embodiments of the present disclosure, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present disclosure.

[0037] A self-rotation graphene heat-dissipation device for a direct-drive electro-hydrostatic actuator includes a shell 1, a shaft 2, a self-rotation mechanism 5, an outer end cover 6, an inner end cover 7 and graphene heat-dissipation layers 9. The shell 1 is arranged on a valve block c of the electro-hydrostatic actuator (EHA) and then sleeves on the outer side of the self-rotation mechanism 5. One end of the shell 1 is in sealed connection with the outer end cover 6 via a seal ring, and the other end of the shell 1 is in sealed connection with the inner end cover 7 via another seal ring. The self-rotation mechanism 5 is coaxially arranged on the outer side of the shaft 2. One end of the shaft 2 is connected with the outer end cover 6, and the other end of the shaft 2 is connected with the valve block c of the EHA by penetrating through the inner end cover 7. The self-rotation mechanism 5 includes a rotor 5-14 and multiple blades 5-1. The rotor 5-14 coaxially sleeves on the outer side of the shaft 2. Four second bolt holes 5-4 are formed in each one of the two end faces of the rotor 5-14. The rotor 5-14 are correspondingly and fixedly connected with the outer end cover 6 and the inner end cover 7 by inserting one of the bolts into a corresponding one of the second bolt holes 5-4 respectively. The outer wall of the rotor 5-14 is slidably connected with the uniformly distributed blades 5-1 along the radial direction of the rotor 5-14, and the outer wall of each of the blades 5-1 is closely attached to the inner wall of the shell 1. The graphene heat-dissipation layers 9 are coated on the whole surface C1 of the component C, and the component C includes the outer wall of the shell 1, the blades 5-1, the rotor 5-14, the inner end cover 6 and the outer end cover 7. And the graphene heat-dissipation layers 9 may be single-layer graphene, multi-layer graphene, graphene oxide, graphene composite heat-dissipation coating, graphene heat-dissipation films or other graphene heat-dissipation materials.

[0038] The shell 1, the self-rotation mechanism 5, the outer end cover 6 and the inner end cover 7 are made of aluminum alloy, titanium alloy, magnesium alloy or other metal materials.

[0039] The shaft 2 is made of the No. 45 steel (Chinese standard), the carbon steel, the alloy steel, the nodular cast iron or other metal materials.

[0040] The shell 1 is of a cylindrical structure, and the inner wall and the outer wall of the shell 1 are eccentrically arranged relative to each other. Two mounting ears are symmetrically arranged on the outer wall of the shell 1 along the radial direction of the shell 1. Two first bolt holes 1-1 are formed in each of the two mounting ears. The shell 1 is fixed to the valve block c of the EHA by inserting one of the bolts into a corresponding one of the first bolt holes 1-1. Two oil ports 1-2 are symmetrically formed in a shell body 1 along the radial direction of the shell 1. One end of each of the two oil ports 1-2 penetrates through the inner wall of the shell 1, and the other end of the oil port 1-2 penetrates through the mounting end face of the shell 1 and is in sealed and close attachment with an oil port A of an oil return path of an accumulator of the EHA.

[0041] Multiple sliding grooves 5-12 formed along the radial direction of the rotor 5-14 are evenly distributed in the outer wall of the rotor 5-14 along the circumferential direction of the rotor 5-14. And, one end of each of the multiple blades 5-1 is inserted into a corresponding one of the multiple sliding grooves 5-12 and elastically connected with the bottom face of the corresponding one of the multiple sliding grooves 5-12 via a spring 5-13. The blades 5-1 are tightly attached to the surface of the inner wall of the shell 1 under the action of pressing force of the springs 5-13, and are rotated and slid along with the rotation of the rotor 5-14. The blades 5-1 can slide up and down in the respective sliding grooves 5-12 along the radial direction of the rotor 5-14.

[0042] The other end of the shaft 2 is provided with an external thread 2-5 by which the shaft 2 is fixed to the valve block c of the EHA. Two shaft shoulders 2-1 and two annular grooves 2-3 are arranged on the outer wall of the shaft 2. The two shaft shoulders 2-1 are located between the two annular grooves 2-3. A bearing 3 is arranged at each of the two shaft shoulders 2-1. A check ring 10 is arranged in each of the two annular groove 2-3. The shaft 2 is connected with the rotor 5-14 via the bearings 3, and the check ring 10 is configured for fixing the bearing 3. An inner-hole boss 5-2 is arranged on the inner wall of the rotor 5-14 in a circumstantial direction of the rotor, and edges of the inner-hole boss which are in an axial direction of the rotor are adjacent to the two end faces of the rotor 5-14. And, the edges of the inner-hole boss are arranged to abut against the respective bearings 3 in the axial direction, and the bearings 3 are in interference fit with the inner wall of the rotor 5-14, so that the rotor 5-14 can rotate around the shaft 2.

[0043] The outer end cover 6 and the inner end cover 7 are both sleeved on the outer side of the shaft 2, and are each uniformly provided with multiple sets of heat-dissipation holes 6-5 penetrating through the respective thickness directions thereof along the respective circumferential directions thereof. Each set of heat-dissipation holes 6-5 includes multiple heat-dissipation holes 6-5 arranged in array. Four third bolt holes 6-1 are provided on each of the outer cover and the inner end cover, and the outer cover and the inner end cover are fixedly connected with the rotor 5-14 by inserting one of the bolts into a corresponding one of the third bolt holes 6-1 respectively.

[0044] A heat-dissipation pipe 7-6 is arranged between one of the heat-dissipation holes 6-5 of the outer end cover 6 and a corresponding one of the heat-dissipation holes 6-5 of the inner end cover 7 in an interference fit mode, and sealed via a seal ring at a engagement position therebetween. The section shapes of both the heat-dissipation pipe 7-6 and the heat-dissipation hole 6-5 can be round, square, rhombus, triangle, ellipse or other geometric shapes capable of increasing the heat-dissipation area. A graphene heat-dissipation layer 9 is arranged on the outer surface of each of the heat-dissipation pipes 7-6. The whole covering surface area of the graphene heat-dissipation layers 9 is increased by providing the heat-dissipation pipes 7-6. The outer wall faces of the heat-dissipation pipes 7-6 are in contact with oil, and the inner wall face and the two end faces of each of the heat-dissipation pipes 7-6 are in contact with air, so that the heat conduction path of the high-temperature oil and the air can be shortened.

[0045] An outer fan 8 is arranged at the outer side of the outer end cover 6. The outer fan 8 is connected with the outer end cover 6 by inserting one of the bolts into a corresponding one of the fourth bolt holes 8-1. A graphene heat-dissipation layer 9 is arranged on the outer surface of the outer fan 8. Graphene heat-dissipation layers 9 can be coated on the surfaces of other parts such as a hydraulic cylinder h of the EHA, an accumulator d of the EHA or an oil pump b of the EHA.

[0046] The surrounding air can fully flow in the present disclosure, especially under the action of the outer fan 8. The surface heat-dissipation coefficient can be improved, and the heat of high-temperature oil in the EHA can be quickly dissipated. The outer fan 8 is made of plastics, high-strength carbon fiber resin matrix composite materials or other composite light materials.

[0047] The direct-drive electro-hydrostatic actuator includes a servo motor a, a hydraulic pump b, a valve block c, an accumulator d, an overflow valve f, a one-way valve g and a hydraulic cylinder h. The self-rotation graphene heat-dissipation device in the present disclosure can also be applied to direct-drive electro-hydrostatic actuators utilizing other principles.

[0048] The valve block c can be mounted on an oil return path on the accumulator d for use, and can also be mounted on an oil inlet and an outlet path of the hydraulic cylinder h for use.

[0049] In the embodiment, the self-rotation graphene heat-dissipation device for a direct-drive electro-hydrostatic actuator is provided. When the accumulator d supplements oil to the EHA system, hydraulic oil flows out of one oil port A of the oil return path of the accumulator d and enters a closed chamber formed by the blades 5-1, the outer wall of the rotor 5-14, the inner wall of the shell 1, the outer end cover 6, the inner end cover 7 and the heat-dissipation pipes 7-6 through the oil ports of the shell 1-2. Due to the fact that the self-rotation mechanism 5 and the shell 1 are eccentrically arranged relative to each other, the contact area between one of the two blades and oil in the closed chamber are different from that between another one of the two blades and the oil in the closed chamber. Under the action of oil with pressure, the two blades are stressed unevenly so that the rotor can generate torque rotation to rotate, and the outer fan 8, the blades 5-1, the outer end cover 7, the inner end cover 6 and the heat-dissipation pipes 7-6 coaxially rotate along with the rotation of the rotor 5-14. The hydraulic oil is pressed into the other oil port of the shell 1-2 during the rotating process of the rotor, and oil is supplemented to the EHA system through the other oil port A of the oil return way of the accumulator. Conversely, when oil of the EHA system returns back to the accumulator, the hydraulic oil flows out from the oil port A corresponding to the oil return path on the accumulator and enters the closed chamber through the corresponding oil port of the shell 1-2. Under the action of the oil with pressure, the two blades in the closed chamber are unbalanced in stress, so that the rotor can generate torque to rotate in an opposite direction. And, the hydraulic oil is pressed into the other oil port of the shell 1-2 in the rotating process of the rotor and flows back to the accumulator through another oil port A of the oil return path on the accumulator.

[0050] For those skilled in the art, obviously the present disclosure is not limited to the details of the exemplary embodiment, and the present disclosure can be achieved in other specific forms without departing from the spirit or essential characteristics of the present disclosure. Therefore, for every point, the embodiments should be regarded as exemplary embodiments and are unrestrictive, the scope of the present disclosure is restricted by the claims appended hereto, and therefore, all changes, including the meanings and scopes of equivalent elements, of the claims are aimed to be included in the present disclosure. Any reference of attached figures in the claims should not be regarded as limitation to the involved claims.

[0051] Further, it should be understood that although the present specification is described with reference to embodiments, not each embodiment contains only one independent technical scheme. The specification is so described just for clarity. Those skilled in the art should regard the specification as a whole, and technical schemes of various embodiments can be combined appropriately to form other implementations which can be understood by those skilled in the art.