Radial piston pump array transmission system for wind turbines

Abstract

The present invention discloses a radial piston pump array group transmission system for a wind turbine, comprising a rotor assembly, wherein the rotor assembly comprises a rotating sleeve, wherein a plurality of transmission rings distributed at equal distances are fixedly mounted coaxially on the outside of the rotating sleeve, and the outer peripheral surface of each transmission ring is a cam roller track with periodic undulations; a plurality of radial piston pumps at fixed positions are distributed in a circumferential array on the outer periphery of each transmission ring; during the rotation of the transmission ring, the periodic undulating cam roller track drives the plunger in each radial piston pump to reciprocate via a transmission member; the present invention improves the output displacement under low speed working conditions by increasing the number of times the plunger acts in a single operating cycle of the rotor, thereby increasing the number of times the plunger acts and the number of cylinders.

Description

Technical Field

[0001] The invention belongs to the field of wind turbines. Background Art

[0002] With the depletion of traditional energy sources and people's increasing attention to environmental protection, significant progress has been made in wind turbine structural design, energy conversion methods, and grid access over the past 20 years. However, many challenges remain in today's wave of high-power wind turbines.

[0003] In traditional gear speed change schemes, large-power wind turbines have reduced reliability due to the increase in the number of gearbox transmission stages, significantly increased unit weight, and increased the difficulty of hoisting and maintenance costs of wind turbines, making them difficult to apply to offshore wind power generation.

[0004] To alleviate this problem, a hydraulic wind turbine generator was proposed, leveraging the high power density of hydraulic transmission systems. Compared to gear-driven transmissions, this solution eliminates the need for a gearbox and rectifier inverter, reducing unit weight by approximately 20%. Flow control can also suppress output power fluctuations caused by random wind speed variations.

[0005] Most hydraulic pumps on the market are designed for constant high-speed drive conditions. Their output power and efficiency are low at low speeds, making it difficult to guarantee stable operation under the low-speed, high-power conditions unique to wind power generation. Furthermore, the universal ball bearings on the slipper assemblies of existing hydraulic wind turbines suffer from heating issues. Summary of the Invention

[0006] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a radial piston pump array group transmission system for a wind turbine.

[0007] Technical Solution: To achieve the above-mentioned object, the radial piston pump array group transmission system of the wind turbine of the present invention comprises a rotor assembly, wherein the rotor assembly comprises a rotating sleeve, and a plurality of equidistantly distributed transmission rings are fixedly mounted coaxially on the outer side of the rotating sleeve, wherein the outer circumference of each transmission ring is a cam raceway with periodic undulations;

[0008] The outer circumference of each transmission ring is distributed with a number of fixed radial piston pumps in a circumferential array. During the rotation of the transmission ring, the periodically undulating cam roller drives the plunger in each radial piston pump to reciprocate through the transmission member.

[0009] Furthermore, a number of equidistantly distributed transmission rings are coaxially provided with fixed cylindrical plunger pump mounting seats, and a number of mounting holes are provided in a circular array on the cylindrical plunger pump mounting seats. A radial plunger pump is fixedly installed in each mounting hole, and a number of radial plunger pumps constitute a plunger pump array group.

[0010] Furthermore, the radial piston pump includes a piston assembly, a cylinder assembly and a sliding shoe assembly.

[0011] Furthermore, the plunger assembly includes a plunger and a linkage rod that are coaxially and integrally connected.

[0012] Furthermore, the sliding shoe assembly includes a universal ball seat, in which a universal ball is rotatably arranged, and the universal ball and the outer peripheral surface of the transmission ring are in rolling cooperation with a cam raceway that is periodically undulating; the end of the linkage rod is fixedly connected to the universal ball seat.

[0013] Furthermore, the cylinder assembly includes a cylinder body, in which an inner sleeve a and an inner sleeve b are coaxially fixedly sleeved; the plunger moves coaxially in the inner sleeve a, and a variable slip ring is provided in a movable sealing jacket between the inner wall of the inner sleeve b and the outer wall of the linkage rod, and the position of the variable slip ring can be adjusted up and down; a pump chamber is formed between the variable slip ring and the plunger, and the oil inlet channel and the oil outlet channel of the radial piston pump are both connected to the pump chamber.

[0014] Furthermore, a breathing column cavity is formed on the side of the plunger away from the linkage rod, and the end of the breathing column cavity away from the plunger is closed. A spring is coaxially arranged in the breathing column cavity. The spring in the breathing column cavity forms an axial thrust on the plunger, so that the universal ball always presses against the cam raceway.

[0015] Furthermore, most of the universal ball is wrapped in the spherical inner wall of the universal ball seat, and the spherical inner wall is matched with the gap of the universal ball, so that there is an air guide gap between the spherical inner wall of the universal ball seat and the outer surface of the universal ball; and there is an air chamber at the top position of the universal ball in the universal ball seat, and the air chamber is connected to the outside world through the air guide gap between the spherical inner wall and the universal ball; the interior of the integrated structure composed of the linkage rod and the plunger is provided with an air guide channel along the length direction, one end of the air guide channel is connected to the breathing column cavity, and the other end is connected to the air chamber.

[0016] Beneficial effect: The present invention increases the number of times the plunger acts in a single operating cycle of the rotor, thereby increasing the number of times the plunger acts and the number of cylinders, thereby improving the output displacement under low-speed working conditions.

[0017] The radial arrangement of multiple cylinders differentiates the output displacement, enabling the radial piston pump to achieve lower output pulsation and higher space utilization while meeting high-power design requirements. Compared with single-acting piston pumps, this transmission structure features smaller axial dimensions and stable operation under low-speed and heavy-load conditions, making it very suitable for special working conditions such as wind power generation.

[0018] For this radial piston pump, wind energy is converted into mechanical energy through the blades and transmitted to the radial piston pump to drive the rotor to rotate. The multi-action cam on the rotor drives the plunger to achieve radial reciprocating motion, causing the internal volume of the plunger cylinder to change periodically, achieving the purpose of oil suction and pumping. The limit effect of the variable slip ring is used to control the oil stroke of the plunger pump, realizing the function of controlling the output flow in a small range.

[0019] At the same time, the periodic change of the air pressure in the air chamber will cause the air chamber and the external atmospheric pressure environment to periodically exchange gas through the air guide gap between the inner wall of the spherical surface and the universal ball, so that the air guide gap between the inner wall of the spherical surface and the universal ball will periodically flow in and out of the gas, thereby continuously removing the heat on the inner wall of the spherical surface in the universal ball and the universal ball seat, thereby playing the role of forced heat dissipation of the universal ball and the universal ball seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Attachment Figure 1 Schematic diagram of the overall structure of this transmission structure;

[0021] Attachment Figure 2 For attachment Figure 1 sectional view of

[0022] Attachment Figure 3 It is a partial cross-sectional view;

[0023] Attachment Figure 4 For attachment Figure 1 Axial exploded view of the foundation;

[0024] Attachment Figure 5 Schematic diagram of the rotor assembly structure;

[0025] Attachment Figure 6 This is a schematic diagram of the structure of a plunger pump array group;

[0026] Attachment Figure 7 This is a schematic diagram of the mounting base of a cylindrical plunger pump;

[0027] Attachment Figure 8 This is a structural diagram of a single radial piston pump;

[0028] Attachment Figure 9 It is a structural cross-sectional view of a single radial piston pump; DETAILED DESCRIPTION

[0029] The present invention will be further described below with reference to the accompanying drawings.

[0030] As attached Figures 1 to 9 The radial piston pump array group transmission system of the wind turbine shown in FIG. Figure 4, including a rotor assembly 30, the rotor assembly 30 includes a rotating sleeve 4, the inner wall of the rotating sleeve 4 is synchronized with the fan impeller shaft through a spline; the rotational kinetic energy of the wind wheel is transmitted to the rotating sleeve 4 through the fan impeller shaft, and a number of equidistantly distributed transmission rings 23 are fixedly installed on the outer coaxial side of the rotating sleeve 4, such as Figure 5 and 3 The outer circumference of each transmission ring 23 is a cam roller 22 with periodic undulations; the outer circumference of each transmission ring 23 is provided with a plurality of radial piston pumps 26 at fixed positions distributed in a circular array. During the rotation of the transmission ring 23, the periodic undulating cam roller 22 drives the plunger 18 in each radial piston pump 26 to reciprocate through the transmission member.

[0031] like Figure 4 The front and rear end outer walls of the rotating sleeve 4 are respectively covered with a front structure support ring 31 and a rear structure support ring 29 through two bearings 27. The front structure support ring 31 and the rear structure support ring 29 are both fixed on the casing or support of the fan; a number of equidistantly distributed transmission rings 23 are coaxially provided with cylindrical plunger pump mounting seats 24, and the two ends of the cylindrical plunger pump mounting seat 24 are respectively fixed to the front structure support ring 31 and the rear structure support ring 29 by flange bolts, so that the cylindrical plunger pump mounting seat 24 constitutes a fixed part; a number of mounting holes 25 are provided on the cylindrical plunger pump mounting seat 24 in a circumferential array, and a radial plunger pump 26 is fixedly installed in each mounting hole 25, and a number of radial plunger pumps 26 constitute a plunger pump array group 28.

[0032] like Figure 2 The radial piston pump 26 includes a piston assembly 1, a cylinder assembly 2 and a sliding shoe assembly 3; the piston assembly 1 includes a piston 18 and a linkage rod 7 that are coaxially integrated.

[0033] like Figure 8 、 9 The sliding shoe assembly 3 includes a universal ball seat 8, in which a universal ball 10 is rotatably arranged. The universal ball 10 rolls with the cam raceway 22 on the outer peripheral surface of the transmission ring 23 which is periodically undulating; the end of the linkage rod 7 is fixedly connected to the universal ball seat 8.

[0034] like Figure 9The cylinder assembly 2 includes a cylinder 19 extending in the radial direction of the rotor assembly 30. The cylinder 19 is fixed in the mounting hole 25 on the cylindrical plunger pump mounting seat 24. The cylinder 19 is coaxially fixed with an inner sleeve a 5.1 and an inner sleeve b 5.2; the plunger 18 coaxially moves in the inner sleeve a 5.1, and a variable slip ring 14 is movable and sealed between the inner wall of the inner sleeve b 5.2 and the outer wall of the linkage rod 7. The variable slip ring 14 can be adjusted up and down and then locked into a fixed part by a locking member. In this solution, the variable slip ring 14 can be understood as a fixed structure; the variable slip ring 14 and the plunger 18 are connected. A pump chamber 16 is formed between the pistons 18 and the piston rods 16. The oil inlet channel 6.2 and the oil outlet channel 6.1 of the radial piston pump 26 are both connected to the pump chamber 16. The reciprocating movement of the piston 18 along the axial direction causes the volume of the pump chamber 16 to change periodically, thereby realizing the periodic oil suction and pumping action of the radial piston pump 26. A breathing column chamber 20 is formed on the side of the piston 18 away from the linkage rod 7. The end of the breathing column chamber 20 away from the piston 18 is closed. A spring 21 is coaxially arranged in the breathing column chamber 20. The spring 21 in the breathing column chamber 20 forms an axial thrust on the piston 18, so that the universal ball 10 always presses against the cam raceway 22.

[0035] like Figure 8 and 9 , most of the universal ball 10 is wrapped in the spherical inner wall 11 in the universal ball seat 8, and the spherical inner wall 11 and the universal ball 10 are matched with each other, so that there is an air guide gap between the spherical inner wall 11 in the universal ball seat 8 and the outer surface of the universal ball 10; and the universal ball seat 8 has an air chamber 9 at the top position of the universal ball 10, and the air chamber 9 is connected to the outside world through the air guide gap between the spherical inner wall 11 and the universal ball 10; the interior of the integrated structure composed of the linkage rod 7 and the plunger 18 is provided with an air guide channel 13 along the length direction, one end of the air guide channel 13 is connected to the breathing column cavity 20, and the other end is connected to the air chamber 9; in this scheme, due to the reciprocating motion of the plunger 18 in the radial piston pump 26, the air in the breathing column cavity 20 The volume of the breathing column cavity 20 increases and decreases periodically, so the air pressure in the breathing column cavity 20 increases and decreases periodically. Since the breathing column cavity 20 is connected to the air chamber 9 through the air guide channel 13, the air pressure in the air chamber 9 changes at the same frequency as the breathing column cavity 20; the periodic change of the air pressure in the air chamber 9 will cause the air chamber 9 and the external atmospheric pressure environment to periodically exchange gas through the air guide gap between the spherical inner wall 11 and the universal ball 10, so that the air guide gap between the spherical inner wall 11 and the universal ball 10 flows in and out of the gas periodically, thereby continuously taking away the heat on the spherical inner wall 11 in the universal ball 10 and the universal ball seat 8, thereby playing a role in forced heat dissipation of the universal ball 10 and the universal ball seat 8.

[0036] Working principle:

[0037] When the wind turbine is running, the rotating sleeve 4 is synchronized with the fan impeller shaft through the spline, so that the rotating sleeve 4 drives the transmission rings 23 to rotate continuously. During the continuous rotation of each transmission ring 23, the cam roller 22 with periodic undulations causes each shoe assembly 3 to fluctuate periodically, and then drives the plunger 18 in each radial piston pump 26 to reciprocate under the linkage of each linkage rod 7, causing the volume of each pump chamber 16 to change periodically, thereby achieving the purpose of periodic oil suction and oil pumping of each radial piston pump 26. Each radial piston pump 26 continuously converts the rotational kinetic energy of the fan impeller into hydraulic energy through the periodic oil suction and oil pumping action, and then drives the generator to generate electricity through the existing hydraulic system and hydraulic motor; the present invention increases the number of times the plunger acts in a single operating cycle of the rotor, thereby increasing the number of plunger actions and the number of cylinders, thereby improving its output displacement under low speed conditions. The radial arrangement of multiple cylinders differentiates the output displacement, enabling the radial piston pump to achieve lower output pulsation and higher space utilization while meeting high-power design requirements. Compared with single-acting piston pumps, this transmission structure features smaller axial dimensions and stable operation under low-speed and heavy-load conditions, making it very suitable for special working conditions such as wind power generation.

[0038] When the universal ball 10 on the universal ball seat 8 continuously rolls on the periodically undulating cam raceway 22, periodic strong friction occurs between the universal ball 10 and the spherical inner wall 11 of the universal ball seat 8, resulting in the problem of continuous heating of the universal ball 10 and the spherical inner wall 11 of the universal ball seat 8, thereby increasing the degree of wear and shortening the service life;

[0039] In this solution, since the volume in the breathing column cavity 20 periodically increases and decreases during the reciprocating motion of the plunger 18 in the radial piston pump 26, the air pressure in the breathing column cavity 20 periodically increases and decreases. Since the breathing column cavity 20 is connected to the air chamber 9 through the air guide channel 13, the air pressure in the air chamber 9 changes at the same frequency as the breathing column cavity 20. The periodic change in the air pressure in the air chamber 9 will cause the air chamber 9 to periodically exchange gas with the external atmospheric pressure environment through the air guide gap between the spherical inner wall 11 and the universal ball 10, so that the air guide gap between the spherical inner wall 11 and the universal ball 10 periodically flows in and out of the gas, thereby continuously taking away the heat on the spherical inner wall 11 in the universal ball 10 and the universal ball seat 8, thereby playing a role in forced heat dissipation of the universal ball 10 and the universal ball seat 8.

[0040] The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A radial piston pump array group transmission system for a wind turbine, characterized by: The invention comprises a rotor assembly (30), wherein the rotor assembly (30) comprises a rotating sleeve (4), a plurality of transmission rings (23) coaxially fixedly mounted on the outer side of the rotating sleeve (4) and distributed at equal distances, and the outer peripheral surface of each transmission ring (23) is a cam roller (22) with periodic undulations; A plurality of radial piston pumps (26) are distributed in a circumferential array on the outer circumference of each transmission ring (23). During the rotation of the transmission ring (23), the periodically undulating cam roller (22) drives the plunger (18) in each radial piston pump (26) to reciprocate through the transmission member. A cylindrical plunger pump mounting seat (24) in a fixed state is coaxially arranged outside the plurality of transmission rings (23), and a plurality of mounting holes (25) are provided on the cylindrical plunger pump mounting seat (24). A radial plunger pump (26) is fixedly mounted in each mounting hole (25), and the plurality of radial plunger pumps (26) constitute a plunger pump array group (28); The radial piston pump (26) comprises a piston assembly (1), a cylinder assembly (2) and a sliding shoe assembly (3); The plunger assembly (1) comprises a plunger (18) and a linkage rod (7) connected coaxially; The sliding shoe assembly (3) includes a universal ball seat (8), a universal ball (10) is rotatably arranged in the universal ball seat (8), and the universal ball (10) and the cam roller (22) are in rolling engagement; the end of the linkage rod (7) is fixedly connected to the universal ball seat (8); The cylinder assembly (2) includes a cylinder (19), wherein an inner sleeve a (5.1) and an inner sleeve b (5.2) are coaxially fixedly mounted in the cylinder (19); a plunger (18) coaxially moves in the inner sleeve a (5.1), and a movable sealing jacket is provided between the inner wall of the inner sleeve b (5.2) and the outer wall of the linkage rod (7), wherein the position of the variable slip ring (14) can be adjusted up and down; a pump chamber (16) is formed between the variable slip ring (14) and the plunger (18), and an oil inlet channel (6.2) and an oil outlet channel (6.1) of a radial piston pump (26) are both connected to the pump chamber (16); A breathing column chamber (20) is formed on the side of the plunger (18) away from the linkage rod (7), and one end of the breathing column chamber (20) away from the plunger (18) is closed. A spring (21) is coaxially arranged in the breathing column chamber (20), and the spring (21) in the breathing column chamber (20) forms an axial thrust on the plunger (18), so that the universal ball (10) always presses against the cam raceway (22); The majority of the universal ball (10) is wrapped in the spherical inner wall (11) in the universal ball seat (8), so that an air guide gap exists between the spherical inner wall (11) in the universal ball seat (8) and the outer surface of the universal ball (10); and the universal ball seat (8) has an air chamber (9) at the top position of the universal ball (10), and the air chamber (9) is connected to the outside world through the air guide gap between the spherical inner wall (11) and the universal ball (10); an air guide channel (13) is provided inside the integrated structure formed by the linkage rod (7) and the plunger (18) along the length direction, and one end of the air guide channel (13) is connected to the breathing column cavity (20), and the other end is connected to the air chamber (9).

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