A radial piston pump assembly
By designing an alternating convex and concave structure for the rotor and stator and a torque-enhancing component in the radial piston pump, the piston movement and oil circuit design are optimized, solving the problems of high machining difficulty, large leakage, and high starting torque of the radial piston pump. This achieves low-noise, low-leakage hydraulic oil delivery and reliable starting under light wind conditions.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- JINAN KAICHUN MASCH CO LTD
- Filing Date
- 2024-12-31
- Publication Date
- 2026-06-30
AI Technical Summary
Existing radial piston pumps suffer from problems such as complex flow distribution, high manufacturing difficulty, large leakage, and large starting torque, making them difficult to start under low wind power generation conditions.
The rotor and stator inside the housing are alternately set with protrusions and recesses. Combined with a torque-increasing component, the main shaft is driven by planetary gears. The piston motion is optimized by using roller and spring design. A valve distribution method is used to reduce leakage, and the oil circuit design is optimized by using an annular channel.
It achieves low-noise, low-leakage hydraulic oil delivery, reduces processing difficulty and starting torque, and improves starting capability under light wind conditions.
Smart Images
Figure CN122304955A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of hydraulic equipment technology, and in particular to a radial piston pump assembly. Background Technology
[0002] In the field of wind power, a wind power generation system is a technology that uses wind energy to convert it into electrical energy. It is generally composed of components such as a wind turbine, generator, tower, and gearbox. The generator is usually installed at a high altitude. For high-power wind power generation systems, the weight of the engine is also greater, and it needs to be matched with a gearbox of higher specifications to increase the rotational speed transmitted by the rotor before transmitting it to the engine. The high altitude of the engine and gearbox places higher requirements on the strength of the tower, and there are also safety hazards in the face of severe weather. Secondly, when workers need to carry out maintenance, they need to climb to the top of the wind power generation system. Frequent climbing to high altitudes makes it difficult to avoid dangerous situations for maintenance workers during the maintenance process, and it is also very labor-intensive.
[0003] Currently, radial piston pumps are being considered as a solution in the market. The working principle of a radial piston pump is to achieve the intake and discharge of hydraulic oil through the reciprocating motion of the pistons. A radial piston pump mainly consists of a stator, pistons, rotor, and distribution shaft. The pistons are radially and evenly arranged in the rotor, moving both in a circular motion with the rotor and in a reciprocating linear motion within the rotor. The distribution shaft is fixed and supports the rotor, and there is an eccentricity between the stator and rotor. When the rotor rotates, the pistons are pressed against the inner wall of the stator under the action of centrifugal force and hydraulic pressure. As the rotor rotates, the sealed working volume at the bottom of the pistons gradually changes, thereby achieving the intake and discharge of hydraulic oil. The pump has advantages such as low noise and high working pressure. In actual operation, the blades of a wind turbine system drive a main shaft to rotate, causing the rotor to rotate. The rotation of the rotor causes the sealed working volume at the bottom of the internal pistons to gradually change, thereby achieving the intake and discharge of hydraulic oil, achieving low-pressure oil intake and high-pressure oil output. The higher-pressure hydraulic oil flows through pipelines to the generator, thus performing work.
[0004] However, existing radial piston pumps have the following problems during use: 1. Traditional radial piston pumps use axial distribution, which is difficult to machine and results in significant leakage. 2. Due to the large number of internal plungers, the internal springs are always under spring pressure, resulting in a large starting torque. When facing low wind or light wind power generation, it will be difficult to start due to the large starting torque. Summary of the Invention
[0005] (a) Technical problems to be solved The purpose of this invention is to provide a radial piston pump assembly to solve the problems existing in the background art. (II) Summary of the Invention To solve the above-mentioned technical problems, the present invention provides the following technical solution: a radial plunger pump assembly, including a housing, a rotor rotatably connected inside the housing, a stator abutting against the outer side of the rotor, both sides of the stator being fixedly connected to the housing, a plurality of protrusions and recesses evenly and alternately arranged on the outer wall of the rotor, the middle part of the rotor being spoke-shaped, a main shaft coaxially connected inside the rotor via splines, the end of the main shaft passing through the housing and being connected to a torque-increasing component, the side of the torque-increasing component away from the housing being connected to an external drive component; The stator has multiple mounting surfaces evenly distributed on its outer surface. A plunger sleeve is fixedly connected to each mounting surface. An oil passage is provided between the plunger sleeve, the stator, and the housing. One end of the oil passage is connected to an oil inlet pipe, and the other end is connected to an oil outlet pipe. A connecting hole is provided in the center of each mounting surface along its radial direction. A plunger is slidably connected to the connecting hole and the plunger sleeve. A roller is rotatably connected to the end of the plunger near the rotor, and the roller abuts against the outer circumferential surface of the rotor. A spring is provided at the other end of the plunger. A sealing end cap is provided at the end of the plunger sleeve away from the roller.
[0007] Preferably, the housing and the stator are fixedly connected by bolts, an annular groove is provided on one side of the stator, a roller bearing is provided between the annular groove and the rotor, and the housing and the main shaft are rotatably connected by a rolling bearing.
[0008] Preferably, the torque-increasing component includes a housing, with a central shaft rotatably mounted inside the housing. The central shaft is fixedly connected to the output shaft of the fan impeller. A first rolling bearing is provided between the central shaft and the housing to allow the central shaft to rotate within the housing. A support frame is fixedly mounted on the outer side of the central shaft. Multiple planetary gears are rotatably mounted at the bottom of the support frame. The planetary gears are meshed with the housing. An output gear meshes with the multiple planetary gears and is connected to the main shaft for transmission.
[0009] Preferably, one end of the spring is fixedly connected to the plunger, and the other end abuts against the sealing end cap.
[0010] Preferably, the oil pipeline includes a first oil suction channel opened on one side of the plunger sleeve and a second oil suction channel opened inside the stator. One end of the first oil suction channel is connected to the inside of the plunger sleeve, and the other end is connected to the second oil suction channel. A first one-way valve is provided between the first oil suction channel and the second oil suction channel. Annular channels are opened on both sides of the housing, one of which is connected to the second oil suction channel. The pipeline also includes a first oil discharge channel opened on the other side of the plunger sleeve and a second oil discharge channel inside the stator on the side away from the second oil suction channel. One end of the first oil discharge channel is connected to the inside of the plunger sleeve, and the other end is connected to the second oil discharge channel. A second one-way valve is provided between the first oil discharge channel and the second oil discharge channel. The other annular channel is connected to the second oil discharge channel. An oil inlet pipe is connected to the annular channel connected to the second oil suction channel, and an oil outlet pipe is connected to the annular channel connected to the second oil discharge channel.
[0011] Preferably, the recovery component is a hydraulically controlled structure.
[0012] Preferably, the oil pipeline includes a first oil suction channel opened on one side of the plunger sleeve and a second oil suction channel opened inside the stator. One end of the first oil suction channel is connected to the inside of the plunger sleeve, and the other end is connected to the second oil suction channel. A first check valve is provided between the first oil suction channel and the second oil suction channel. Annular channels are opened on both sides of the housing. One side of the annular channel is connected to the second oil suction channel. The system also includes a first oil discharge channel opened inside the plunger sleeve and a second oil discharge channel inside the stator on the side away from the second oil suction channel. One end of the first oil discharge channel is connected to the inside of the hydraulic control structure, and the other end is connected to the second oil discharge channel. A second check valve is provided between the first oil discharge channel and the second oil discharge channel. The other side of the annular channel is connected to the second oil discharge channel. An oil inlet pipe is connected to the annular channel connected to the second oil suction channel, and an oil outlet pipe is connected to the annular channel connected to the second oil discharge channel.
[0013] (III) Beneficial Effects The radial plunger pump assembly provided by this invention has the following advantages: 1. The main shaft drives the rotor to rotate. The circumferential protrusion of the rotor causes the plunger to move upward within the plunger sleeve, compressing the volume of the chamber and pumping the oil to the generator to perform work. Then, the spring force causes the plunger to move downward as it passes through the recess of the rotor, expanding the volume of the chamber and creating a low pressure that draws oil from the tank into the chamber through the oil pipeline, preparing for the next pumping. Furthermore, by setting annular channels in the two side housings, the number of oil inlet and outlet pipes is reduced, lowering the possibility of leakage, facilitating maintenance, and simplifying processing.
[0014] 2. By setting up a torque-increasing component, multiple planetary gears are used to drive the spindle to rotate, resulting in a larger number of meshing teeth and a larger overlap coefficient on the output spindle, thereby increasing the output torque of the spindle and overcoming the problem of large starting torque and difficulty in starting caused by a large number of internal plungers. Attached Figure Description
[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0016] Figure 1 This is a schematic diagram of the internal planar structure of the present invention; Figure 2 This is a schematic diagram of the internal planar structure from another perspective of the present invention; Figure 3 This is a schematic diagram of the internal three-dimensional structure of the torque-increasing component in this invention.
[0017] The reference numerals in the figure are as follows: 1. Housing; 2. Rotor; 21. Protrusion; 22. Recess; 3. Stator; 31. Mounting surface; 32. Annular groove; 33. Roller bearing; 4. Main shaft; 5. Torque-increasing assembly; 51. Housing; 52. Central shaft; 53. First rolling bearing; 54. Support frame; 55. Planetary gear; 56. Output gear; 6. Plunger sleeve; 7. Oil pipeline; 71. First oil suction channel; 72. Second oil suction channel; 73. First check valve; 74. First oil discharge channel; 75. Second oil discharge channel; 76. Second check valve; 8. Plunger; 9. Roller; 10. Spring; 11. Sealing end cap. Detailed Implementation
[0018] 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.
[0019] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0020] Please see Figures 1-3 A radial plunger pump assembly includes a housing 1, a rotor 2 rotatably connected inside the housing 1, a stator 3 abutting against the outer side of the rotor 2, and the two sides of the stator 3 being fixedly connected to the housing 1 respectively. The outer wall of the rotor 2 is uniformly and alternately provided with a plurality of protrusions 21 and recesses 22, and the protrusions 21 and recesses 22 are spaced apart to make the outer circumferential surface of the rotor 2 wavy. The middle part of the rotor 2 is spoked, which reduces the weight of the rotor 2. The rotor 2 is coaxially connected to a main shaft 4 through a spline inside, which improves the rotational stability of the main shaft 4 and the rotor 2. The end of the main shaft 4 extends out of the housing 1 and is connected to a torque amplifying component 5. The side of the torque amplifying component 5 away from the housing is connected to an external drive component.
[0021] The torque-increasing component 5 includes a housing 51, inside which a central shaft 52 is rotatably mounted. The central shaft 52 is fixedly connected to the output shaft of the fan impeller. A first rolling bearing 53 is provided between the central shaft 52 and the housing 51 to allow the central shaft 52 to rotate within the housing 51. A support frame 54 is fixedly mounted on the outside of the central shaft 52. Multiple planetary gears 55 are rotatably mounted on the bottom of the support frame 54. The planetary gears 55 are meshed with the housing 51. An output gear 56 meshes with the multiple planetary gears 55 and is connected to the main shaft 4. By using the multiple planetary gears 55 to drive the output gear 56 to rotate, the main shaft 4 is driven to rotate. This results in a large number of meshing teeth and a large overlap coefficient on the main shaft, increasing the output torque of the main shaft and overcoming the problem of large starting torque and difficulty in starting caused by a large number of internal plungers.
[0022] Multiple mounting surfaces 31 are evenly distributed on the outer surface of the stator 3. A plunger sleeve 6 is fixedly connected to each mounting surface 31. An oil passage 7 is provided between the plunger sleeve 6, the stator 3 and the housing 1. One end of the oil passage 7 is connected to the oil inlet pipe and the other end is connected to the oil outlet pipe. A connecting hole is provided in the center of each mounting surface 31 along its radial direction. A plunger 8 is slidably connected to the connecting hole and the plunger sleeve 6. A roller 9 is rotatably connected to one end of the plunger 8 near the rotor 2, and the roller 9 abuts against the outer peripheral surface of the rotor 2. A spring 10 is provided at the other end of the plunger 8. One end of the spring 10 is fixedly connected to the plunger 8, and the other end abuts against the sealing end cap 11. A sealing end cap 11 is provided at the end of the plunger 8 away from the roller 9.
[0023] Furthermore, the housing 1 and the stator 3 are fixedly connected by bolts. An annular groove 32 is provided on one side of the stator 3. A roller bearing 33 is provided between the annular groove 32 and the rotor 2, so that the wear between the rotor 2 and the stator 3 is reduced. The housing 1 and the main shaft 4 are rotatably connected by a rolling bearing, so that the main shaft can roll inside the housing 1.
[0024] Furthermore, the oil pipeline 7 includes a first oil suction channel 71 opened on one side of the plunger sleeve 6 and a second oil suction channel 72 opened inside the stator. One end of the first oil suction channel 71 is connected to the inside of the plunger sleeve 6, and the other end is connected to the second oil suction channel 72. A first one-way valve 73 is provided between the first oil suction channel 71 and the second oil suction channel 72. Annular channels are opened on both sides of the housing 1, one of which is connected to the second oil suction channel 72. It also includes a first oil discharge channel opened on the other side of the plunger sleeve 6. The first oil discharge channel 74 and the second oil discharge channel 75 are located on the side of the stator 3 away from the second oil suction channel 72. One end of the first oil discharge channel 74 is connected to the interior of the plunger sleeve 6, and the other end is connected to the second oil discharge channel 75. A second one-way valve 76 is provided between the first oil discharge channel 74 and the second oil discharge channel 75. The annular channel on the other side is connected to the second oil discharge channel 75. The annular channel connected to the second oil suction channel 72 is connected to an oil inlet pipe, and the annular channel connected to the second oil discharge channel 75 is connected to an oil outlet pipe.
[0025] After the impeller of the wind power generation system rotates, the output shaft of the impeller drives the central shaft 52 to rotate through a coupling or other means. The rotation is then transmitted to the planetary gear 55 and then to the output gear 56 in the middle. It should be noted that, under normal circumstances, the amount of oil pumped when the rotor speed is 15-20 revolutions per minute is sufficient to enable the downstream power generation equipment to reach the operating conditions. The oil is then transmitted from the output gear 56 to the main shaft 4 through the coupling.
[0026] After the main shaft 4 rotates, it drives the rotor 2 to rotate. The circumferential protrusion of the rotor 2 drives the plunger 8 to move upward in the plunger sleeve 6, compressing the volume of the chamber and pumping the oil to the generator to perform work. Then, the spring force causes the plunger to move downward when it passes the concave part of the rotor, expanding the volume of the chamber and creating a low pressure that allows oil from the oil tank to be drawn into the chamber through the oil line 7, preparing for the next pumping of oil outward. Furthermore, by setting annular channels in the two side housings, the number of oil inlet and outlet pipes is reduced, and the valve distribution method is adopted to reduce the possibility of leakage.
[0027] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.
[0028] 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 radial piston pump group comprising a housing (1), characterized in that: The rotor (2) is rotatably connected inside the housing (1). The stator (3) abuts against the outside of the rotor (2). The two sides of the stator (3) are fixedly connected to the housing (1) respectively. The outer wall of the rotor (2) is evenly and alternately provided with multiple protrusions (21) and recesses (22). The middle part of the rotor (2) is spoke-shaped. The main shaft (4) is coaxially connected inside the rotor (2) through a spline. The end of the main shaft (4) passes through the housing (1) and is connected to a torque-increasing component (5). The side of the torque-increasing component (5) away from the housing is connected to an external drive component. The stator (3) has multiple mounting surfaces (31) evenly distributed on its outer surface. A plunger sleeve (6) is fixedly connected to each mounting surface (31). An oil line (7) is provided between the plunger sleeve (6), the stator (3), and the housing (1). One end of the oil line (7) is connected to the oil inlet pipe, and the other end is connected to the oil outlet pipe. A connecting hole is provided in the center of each mounting surface (31) along its radial direction. A plunger (8) is slidably connected to the connecting hole and the plunger sleeve (6). A roller (9) is rolledly connected to the end of the plunger (8) near the rotor (2), and the roller (9) abuts against the outer circumferential surface of the rotor (2). A spring (10) is provided at the other end of the plunger (8), and a sealing end cap (11) is provided at the end of the plunger (8) away from the roller (9).
2. A radial piston pump group according to claim 1, characterized in that: The housing (1) and the stator (3) are fixedly connected by bolts. An annular groove (32) is provided on one side of the stator (3). A roller bearing (33) is provided between the annular groove (32) and the rotor (2). The housing (1) and the main shaft (4) are rotatably connected by a rolling bearing.
3. A radial piston pump group according to claim 2, characterized in that: The torque-increasing assembly (5) includes a housing (51), inside which a central shaft (52) is rotatably mounted. The central shaft (52) is fixedly connected to the output shaft of the fan impeller. A first rolling bearing (53) is provided between the central shaft (52) and the housing (51) for the central shaft (52) to rotate within the housing (51). A support frame (54) is fixedly mounted on the outside of the central shaft (52). Multiple planetary gears (55) are rotatably mounted on the bottom of the support frame (54). The planetary gears (55) are meshed with the housing (51). An output gear (56) meshes with the multiple planetary gears (55). The output gear (56) is connected to the main shaft (4) for transmission.
4. A radial piston pump group according to claim 3, characterized in that: One end of the spring (10) is fixedly connected to the plunger (8), and the other end abuts against the sealing end cap (11).
5. A radial piston pump group according to claim 4, characterized in that: The oil pipeline (7) includes a first oil suction channel (71) opened on one side of the plunger sleeve (6) and a second oil suction channel (72) opened inside the stator. One end of the first oil suction channel (71) is connected to the inside of the plunger sleeve (6), and the other end is connected to the second oil suction channel (72). A first check valve (73) is provided between the first oil suction channel (71) and the second oil suction channel (72). The housings (1) on both sides are provided with annular channels, one of which is connected to the second oil suction channel (72). The pipeline also includes a first oil discharge channel opened on the other side of the plunger sleeve (6). The first oil discharge channel (74) and the second oil discharge channel (75) are located on the side of the stator (3) away from the second oil suction channel (72). One end of the first oil discharge channel (74) is connected to the inside of the plunger sleeve (6), and the other end is connected to the second oil discharge channel (75). A second check valve (76) is provided between the first oil discharge channel (74) and the second oil discharge channel (75). The annular channel on the other side is connected to the second oil discharge channel (75). The annular channel connected to the second oil suction channel (72) is connected to an oil inlet pipe, and the annular channel connected to the second oil discharge channel (75) is connected to an oil outlet pipe.