A high power electrical transmission rotary joint

Abstract

The application relates to a high-power electric transmission rotary joint, belonging to the field of aerospace electromechanics, which comprises a flange, a power outer ring, a power inner ring and a column, the power outer ring and the power inner ring are power rings with the same thickness and different diameters, the power inner ring is inserted into the power outer ring and has a dynamic-static gap to form a group of power outer rings, a plurality of groups of power outer rings are distributed along the flange axis direction, and a plurality of columns are inserted into each group of power outer rings to limit the relative rotation of the rings; the flange, the power outer ring and the column form a stator, and the power inner ring is a rotor which is rotationally connected in the stator to form a rotary joint, and the application has the advantages of large transmission power and safety.

Description

Technical Field

[0001] This invention relates to the field of aerospace electromechanical technology, and in particular to a high-power electrical transmission rotary joint. Background Technology

[0002] Existing high-power electrical transmission rotary joints are mainly divided into conductive slip rings and conductive roller rings. Roller ring designs have low friction and wear, making them suitable for long-term operation. To improve transmission capacity, multiple rings need to be stacked for power transmission, with the inter-ring circuits insulated by insulating materials. However, using multiple rings for power transmission increases the difficulty of assembling and positioning each ring, and during rotation, misalignment and relative rotation between rings are prone to occur. Current anti-rotation schemes using clamping at both ends limit the increase in the number of rings. Furthermore, the simple insulation structure between rings makes them susceptible to wear debris bridging. There is also a single conductive ring configuration, which has low structural efficiency.

[0003] Therefore, to address the above shortcomings, a high-power electrical transmission rotary joint is needed. Summary of the Invention

[0004] (a) Technical problems to be solved The technical problem to be solved by the present invention is to address the low efficiency of existing high-power electrical transmission rotary joints.

[0005] (II) Technical Solution To address the aforementioned technical problems, this invention provides a high-power electrical transmission rotary joint, comprising a flange, an outer power ring, an inner power ring, and columns. The outer and inner power rings are power rings of the same thickness but different diameters. The inner power ring is inserted into the outer power ring with a dynamic-static gap to form a set of power rings. Several sets of power rings are distributed along the flange axis. Several columns are inserted into each set of outer power rings to restrict the relative rotation of each ring. The flange, outer power ring, and columns constitute the stator, and the inner power ring is the mover. The mover is rotatably connected within the stator to form a rotary joint.

[0006] As a further explanation of the present invention, preferably, a plurality of waist-shaped wire holes are spaced apart at the annular positions of the power outer ring and the power inner ring, and the wire holes are all through holes; the cables connected to the rotating joint electrically connect each ring of the power outer ring and each ring of the power inner ring through the wire holes.

[0007] As a further explanation of the present invention, preferably, a transverse wire groove is provided on one side of the wire hole. The transverse wire groove is a countersunk hole with a depth greater than the outer diameter of the cable. A connector is provided in the transverse wire groove. The cable passes through the wire hole and the transverse wire groove and is connected to the connector. The connector is fixed to the power outer ring and the power inner ring by bolts.

[0008] As a further explanation of the present invention, preferably, a radial through-hole is provided in the radial direction of the connector, the opening direction of the radial through-hole on the outer power ring faces inward, and the opening direction of the radial through-hole on the inner power ring faces outward; the radial through-hole is also a countersunk hole and its depth is the same as the depth of the transverse through-hole, the radial through-hole is connected to the transverse through-hole, and a rotating ring is provided between the outer power ring and the inner power ring to reduce rotational friction. The rotating ring includes an inner and outer ring-shaped retainers distributed in two layers and a rolling ring rotatably connected between the two retainers. The outer retainer is connected to the connector of the outer power ring through the radial through-hole, and the inner retainer is connected to the connector of the inner power ring through the radial through-hole.

[0009] As a further explanation of the present invention, preferably, the column is a plurality of cylindrical rods with the same length as the thickness of the power outer ring, the length direction of the column is the same as the axial direction of the power outer ring, and the column passes through the power outer ring and is threadedly connected to the flange.

[0010] As a further explanation of the present invention, preferably, both the outer arc surfaces of the power outer ring and the power inner ring are covered with an insulating layer, and an insulating layer is also provided between adjacent power outer rings, wherein the thickness of the insulating layer between adjacent rings is greater than that of the insulating layer at the outer arc surface.

[0011] As a further explanation of the present invention, preferably, a plurality of S-shaped turning labyrinth structures are provided at the contact points of the insulating layers between adjacent rings, and the turning labyrinth structures are hollow grooves.

[0012] As a further explanation of the present invention, preferably, a signal ring is embedded in the hollow structure of the power inner ring.

[0013] (III) Beneficial Effects The above-described technical solution of the present invention has the following advantages: This invention designs a column that passes through each ring hole to achieve installation positioning and anti-rotation functions, while improving the structural lightweighting of the conductive rolling ring; the design of the crimp joint, combined with the inter-ring labyrinth structure, achieves no direct discharge path between rings, improving insulation safety; the design of the power inner ring and signal ring nested structure makes full use of the large and medium hole structure, resulting in a highly efficient and compact power transmission structure. Attached Figure Description

[0014] Figure 1 This is a structural diagram of the rotor portion of the present invention; Figure 2 This is a diagram of the thread hole structure of the present invention; Figure 3 This is a cross-sectional view of the rotor of the present invention; Figure 4 This is a cross-sectional view of a single segment of the power outer ring of the present invention.

[0015] In the diagram: 1. Flange; 2. Power outer ring; 3. Power inner ring; 4. Column; 5. Swivel; 51. Roller ring; 52. Cage; 6. Wire hole; 61. Transverse wire groove; 62. Radial wire groove; 63. Cable; 64. Connector; 65. Insulation layer; 66. Turning labyrinth structure. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] A high-power electrical transmission rotary joint includes a mover and a stator, the mover being rotatably connected within the stator, and cables 63 connected to both the mover and the stator for electrical transmission between them. Figure 1 As shown, the stator includes a flange 1, an outer power ring 2, and columns 4. The mover includes an inner power ring 3. The outer power ring 2 and the inner power ring 3 are power rings of different diameters but the same thickness. The inner power ring 3 is inserted into the outer power ring 2 with a dynamic-static gap. A rotating ring 5, which reduces rotational friction, is rotatably connected between the gaps. The signal ring is embedded in the inner power ring 3. Two nested outer power rings 2 and inner power rings 3, along with a rotating ring 5, form a set of power rings. Several rings are distributed along the axial direction of the flange 1. Four columns 4 are inserted between the outer power rings 2 to restrict the relative rotation of the rings in the stator. The four columns 4 are designed to form a cage-like structure. Each column 4 directly forms a rigid constraint on a single ring, allowing the rotary joint to support the stacking of more than ten sets of rings. Furthermore, the length of the columns 4 can be flexibly adapted to different ring count requirements, forming a modular expansion capability.

[0018] Combination Figure 1 , Figure 3 The outer power ring 2 and the inner power ring 3 are each provided with four arc-shaped first through holes 6 at an annular position. All through holes 6 are through-holes, through which cables 63 extend from the outside into the rotary joint and electrically connect to the outer power ring 2 and the inner power ring 3 to conduct electrical power. By setting the outer power ring 2 and the inner power ring 3 with multiple arc-shaped through holes 6, not only can the volume of the rotary joint be reduced, but its mass can also be significantly reduced. Furthermore, the embedded signal ring is used for low-power signal transmission, resulting in a more compact structure. Under the requirement of high-power electrical transmission with ten rings and a working current of 40A per ring, the existing rotary joint weighs 15kg, while the improved joint weighs 13kg, a weight reduction of 13%.

[0019] Combination Figure 2 , Figure 3Each side of the cable threading hole 6 has a transverse cable threading groove 61. The transverse cable threading groove 61 is a countersunk hole with a depth greater than the outer diameter of the cable 63. A connector 64 is provided in the transverse cable threading groove 61. The cable 63 passes through the cable threading hole 6 and the transverse cable threading groove 61 and connects to the connector 64. The connector 64 is fixed to the power outer ring 2 and the power inner ring 3 by bolts. The connector 64 has a radial cable threading groove 62 in the radial direction. The radial cable threading groove 62 on the power outer ring 2 opens inward, and the radial cable threading groove 62 on the power inner ring 3 opens outward. The radial cable threading groove 62 is also a countersunk hole with the same depth as the transverse cable threading groove 61. The radial cable threading groove 62 is connected to the transverse cable threading groove 61. The rotating ring 5 includes two annular retainers 52 distributed in inner and outer layers, and rolling rings 51 rotatably connected between the two retainers 52. The outer retainer 52 is connected to the terminal 64 of the outer power ring 2 through a radial wire groove 62, and the inner retainer 52 is connected to the terminal 64 of the inner power ring 3 through a radial wire groove 62. The multiple rolling rings 51 on the retainer 52, which rotate at intervals, are rotatably connected to the stator and the mover respectively, so that the mover can rotate smoothly in the stator and carry out smooth electrical transmission, and the electrical noise is less than 0.1mV.

[0020] Combination Figure 1 , Figure 3 The column 4 is formed by several cylindrical rods of the same length and thickness as the outer power ring 2, connected by threads. The length direction of the column 4 is the same as the axial direction of the outer power ring 2, and the column 4 passes through the outer power ring 2 and is threaded to the flange 1. By modularly combining the column 4, the number of rings can be adjusted more flexibly as needed, and the weight is reduced by more than 1 kg compared to the traditional closed metal shell structure. Moreover, the through-positioning of the cage structure means that each ring only needs to ensure the fitting accuracy between the positioning hole and the column, and the error can be relaxed to 0.05 mm. There is no need to separately calibrate the axial concentricity, the assembly difficulty is reduced, the pass rate is increased from the traditional 70% to more than 95%, and the rework cost caused by insufficient accuracy is reduced.

[0021] Combination Figure 1 , Figure 4 The outer arc of the power outer ring 2 is covered with an insulating layer 65, and an insulating layer 65 is also provided between adjacent power outer rings 2. The insulating layer 65 is made of polyimide material. The thickness of the insulating layer 65 between the power outer rings 2 is greater than that of the insulating layer 65 at the outer arc surface. Several layers of labyrinthine S-shaped turning labyrinth structures 66 are formed at the contact between the insulating layer 65 between the power outer rings 2 and the power outer ring 2. The turning labyrinth structure 66 is a hollow slot. The turning path of this structure can block the discharge path and avoid short circuits between the power rings. In addition, the turning labyrinth structure changes the insulation path between the rings from a straight line to a turning shape, increasing the creepage distance by 2 to 3 times compared with traditional planar insulation. Even under high humidity and low air pressure, it can avoid surface discharge and improve the insulation reliability in extreme environments.

[0022] In summary, the present invention features a compact design with small size and weight, providing 10 power loops and 30 signal loops with reliable inter-loop insulation. The use of polyimide insulation eliminates direct discharge paths between loops, reducing the likelihood of short circuits caused by wear debris between adjacent loops and preventing direct arcing discharges from exposed conductors between loops.

[0023] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-power electrical transmission rotary joint, characterized in that: The system includes a flange (1), an outer power ring (2), an inner power ring (3), and a column (4). The outer power ring (2) and the inner power ring (3) are power rings of the same thickness but different diameters. The inner power ring (3) is inserted into the outer power ring (2) with a dynamic-static gap to form a set of power rings. Several sets of power rings are distributed along the axial direction of the flange (1). Several waist-shaped wire holes (6) are spaced apart at the annular positions of the outer power ring (2) and the inner power ring (3). All wire holes (6) are through holes. The cable connected to the rotating joint passes through the wire hole. The holes electrically connect each ring of the outer power ring (2) and each ring of the inner power ring (3); a transverse wire groove (61) is provided on one side of the wire hole (6). The transverse wire groove (61) is a countersunk hole with a depth greater than the outer diameter of the cable. A connector (64) is provided in the transverse wire groove (61). The cable passes through the wire hole (6) and the transverse wire groove (61) and is connected to the connector (64). The connector (64) is fixed to the outer power ring (2) and the inner power ring (3) by bolts; a radial wire groove is provided in the radial direction of the connector (64). 62), the radial wire groove (62) on the outer power ring (2) opens inward, and the radial wire groove (62) on the inner power ring (3) opens outward; the radial wire groove (62) is also a countersunk hole and its depth is the same as that of the transverse wire groove (61), and the radial wire groove (62) is connected to the transverse wire groove (61); several columns (4) are inserted into each group of outer power rings (2) to restrict the relative rotation of each ring; the flange (1), the outer power ring (2) and the columns (4) constitute the stator, and the inner power ring (3) is the mover. The mover is rotatably connected to the stator to form a rotary joint; a rotating ring (5) is provided between the power outer ring (2) and the power inner ring (3) to reduce rotational friction. The rotating ring (5) includes an inner and outer ring cages (52) and a rolling ring (51) rotatably connected between the two cages (52). The outer cage (52) is connected to the terminal (64) of the power outer ring (2) through a radial wire groove (62), and the inner cage (52) is connected to the terminal (64) of the power inner ring (3) through a radial wire groove (62).

2. The high-power electrical transmission rotary joint according to claim 1, characterized in that: The column (4) consists of several cylindrical rods with the same length and thickness as the power outer ring (2). The length direction of the column (4) is the same as the axial direction of the power outer ring (2). The column (4) passes through the power outer ring (2) and is threadedly connected to the flange (1).

3. A high-power electrical transmission rotary joint according to claim 2, characterized in that: The outer arc surfaces of the power outer ring (2) and the power inner ring (3) are covered with an insulating layer (65). An insulating layer (65) is also provided between adjacent power outer rings (2). The thickness of the insulating layer (65) between adjacent power outer rings (2) is greater than that of the insulating layer (65) at the outer arc surfaces of the power outer ring (2) and the power inner ring (3).

4. A high-power electrical transmission rotary joint according to claim 3, characterized in that: Several layers of S-shaped turning labyrinth structures (66) are provided at the contact point of the insulating layer (65) between adjacent power outer rings (2), and the turning labyrinth structure (66) is a hollow groove.

5. A high-power electrical transmission rotary joint according to claim 4, characterized in that: The power inner loop (3) has a hollow structure with a signal loop embedded in it.

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