Flow-adjustable rotor displacement pump based on elliptical rotor engine
By integrating the one-way valve with the cylinder block and cooperating with the gear ring, the problems of large size and poor portability of existing elliptical rotor engine pumps have been solved, achieving the effects of reduced oil pump size, expanded oil pressure range, enhanced sealing, and reduced mechanical energy loss.
Patent Information
- Application Number
- CN202510966333.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-14
- Publication Date
- 2025-10-28
AI Technical Summary
Existing adjustable flow rotary volume pumps based on elliptical rotor engines employ a design that separates the check valve from the cylinder block. This results in a large number of check valve components that occupy a significant radial space, leading to a large pump size and poor portability.
It adopts an integrated design of one-way valve and cylinder block, combined with gear and gear ring, and has a built-in reducer with a reduction ratio of 1:2. The oil pressure range can be expanded and adjusted by adjusting the spring force of the outlet one-way valve. It abandons the linear motion mode of traditional plunger-type positive displacement pumps and adopts a sealed design that directly contacts the oil to reduce mechanical energy loss.
This has resulted in a smaller oil pump size, improved portability, expanded oil pressure range, enhanced sealing effect, reduced mechanical energy loss, more compact structure, and optimized space utilization.
Smart Images
Figure CN120845334A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of oil pumps, and more particularly to an adjustable flow rotary volumetric pump based on an elliptical rotor engine. Background Technology
[0002] Oil pumps, as crucial mechanical devices, are specifically designed for transporting or pressurizing various types of oily fluids. Their applications are widespread, covering multiple key sectors including industry, automotive, agriculture, and construction. Essentially, an oil pump is an energy conversion device that efficiently converts input mechanical energy into hydraulic energy. Its core function is to smoothly transport various fluids, such as lubricating oil, fuel oil, and hydraulic oil, from low-pressure areas to high-pressure areas, or to provide stable and necessary pressure support for various hydraulic systems.
[0003] Through the rotation or reciprocating motion of its internal components, the oil pump can efficiently draw in liquid, pressurize it, and finally discharge the pressurized liquid. This continuous process ensures that the oil pump can operate stably in various complex environments and meet different application requirements.
[0004] In the automotive industry, the oil pump, as an indispensable part of the engine fuel supply system, plays a crucial role in precisely delivering fuel from the fuel tank to the engine, ensuring continuous and stable combustion and power output. In the industrial sector, oil pumps are widely used in the lubrication and hydraulic systems of various mechanical equipment, providing the necessary lubrication and power support for the normal operation of the equipment, thereby ensuring a steady increase in production efficiency.
[0005] Furthermore, oil pumps also play a crucial role in agriculture. They are widely used in irrigation systems and the hydraulic systems of agricultural machinery, providing strong support for crop growth and the efficient operation of agricultural machinery. In the construction industry, oil pumps are more often used in complex tasks such as concrete mixing, conveying, and grouting, and their powerful hydraulic capabilities make the construction process more efficient and convenient.
[0006] In the prior art, an adjustable flow rotary volumetric pump based on an elliptical rotor engine often adopts a design that separates the check valve from the cylinder block, resulting in a large number of check valve components that occupy a large radial space, making the oil pump large in size and poor in portability.
[0007] To address the above problems, an adjustable flow rotary volumetric pump based on an elliptical rotor engine is proposed. Summary of the Invention
[0008] To overcome the above shortcomings, this invention provides an adjustable flow rotor volumetric pump based on an elliptical rotor engine. It aims to improve the problem that existing adjustable flow rotor volumetric pumps based on elliptical rotor engines often adopt a design that separates the check valve from the cylinder body, resulting in a large number of check valve components that occupy a large radial space, making the pump bulky and less portable.
[0009] To achieve the above objectives, the present invention adopts the following technical solution: an adjustable flow rotor volumetric pump based on an elliptical rotor engine, comprising a front cylinder head, a cylinder block, a rear cylinder block, and a crankshaft. The front cylinder head is internally threaded with multiple external gear fixing screws, and an external gear ring is rotatably connected to the outside of each external gear fixing screw. The cylinder block has an internal groove, and two sealing rings are installed inside the groove. A cylinder block top seal is installed inside the cylinder block. A copper sleeve is installed on the outside of the crankshaft, and an elliptical rotor is fitted onto the outside of the copper sleeve. Two rotor seals are provided inside the elliptical rotor. Multiple rotor fixing bolts are internally threaded with the elliptical rotor, and an internal gear is rotatably connected to the outside of each rotor fixing bolt. Multiple rotor fixing nuts are internally threaded with the elliptical rotor, and an internal gear is rotatably connected to the outside of each rotor fixing nut. The internal gear meshes with the external gear ring. A fixing assembly is provided between the front cylinder head and the rear cylinder block.
[0010] As a further description of the above technical solution: The outer side of the front cylinder head is located outside the sealing ring.
[0011] As a further description of the above technical solution: The fixing assembly includes multiple cylinder bolts, the outer side of which is rotatably connected to the inside of the front cylinder head, and the outer side of which is threaded with a cylinder nut.
[0012] As a further description of the above technical solution: The crankshaft has a keyway inside, and a flat key is installed inside the keyway.
[0013] As a further description of the above technical solution: The sealing ring is located on the outer side of the rear cylinder block.
[0014] As a further description of the above technical solution: The cylinder bolt is rotated outward to connect to the inside of the cylinder body.
[0015] As a further description of the above technical solution: The rear cylinder is equipped with a locating pin.
[0016] As a further description of the above technical solution: Both ends of the copper sleeve are fitted with shaft retaining rings.
[0017] The present invention has the following beneficial effects: 1. In this invention, by integrating the one-way valve with the cylinder body, the number of one-way valve components is reduced, the radial space requirement is lowered, and the oil pump volume is reduced and portability is improved.
[0018] 2. In this invention, by employing a gear and gear ring mesh design with a built-in reducer with a reduction ratio of 1:2, the speed of the drive shaft is reduced and the output torque is increased. Combined with the adjustment of the spring force of the outlet one-way valve, the oil pressure range is expanded and the oil pressure is regulated. 3. In this invention, by directly utilizing the rotation of the drive shaft to drive the elliptical rotor, the linear motion mode of the cam-driven plunger in the traditional plunger-type positive displacement pump is abandoned, thus simplifying the force transmission process and reducing mechanical energy loss.
[0019] 4. In this invention, the design of multiple seals in direct contact with oil enhances the sealing effect and reduces mechanical energy loss caused by friction.
[0020] 5. In this invention, the axial dimension is reduced through a carefully designed structural layout, resulting in a smaller overall volume and a more compact structure, which optimizes space utilization and enhances sealing performance. Attached Figure Description
[0021] Figure 1 This is a perspective view of an adjustable flow rotary volumetric pump based on an elliptical rotor engine proposed in this invention. Figure 2 This is an exploded view of the overall flow-rate rotary volumetric pump based on an elliptical rotor engine proposed in this invention. Figure 3 This is a front view cross-sectional schematic diagram of an adjustable flow rotor volumetric pump based on an elliptical rotor engine proposed in this invention. Figure 4 This is a schematic diagram of the operation of an adjustable flow rotor volumetric pump based on an elliptical rotor engine proposed in this invention. Figure 5 This is a control flowchart of an adjustable flow rotor volumetric pump based on an elliptical rotor engine proposed in this invention.
[0022] Legend: 1. Cylinder block bolts; 2. Front cylinder head; 3. External gear ring; 4. External gear fixing screws; 5. Cylinder block top seal; 6. Sealing ring; 7. Cylinder block; 8. Crankshaft; 9. Flat key; 10. Shaft snap ring; 11. Copper bushing; 12. Rotor fixing bolts; 13. Internal gear; 14. Rotor seal; 15. Elliptical rotor; 16. Rotor fixing nut; 17. Rear cylinder block; 18. Locating pin; 19. Cylinder block nut. Detailed Implementation
[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0024] Reference Figure 1 - Figure 3 An embodiment of the present invention provides an adjustable flow rotary volumetric pump based on an elliptical rotor engine, comprising a front cylinder head (2), a cylinder block (7), a rear cylinder block (17), and a crankshaft (8). The front cylinder head (2) is internally threaded with multiple external gear fixing screws (4), and external gear rings (3) are rotatably connected to the outer sides of the external gear fixing screws (4). The cylinder block (7) has an internal groove, in which two sealing rings (6) are installed. A cylinder block top seal (5) is installed inside the cylinder block (7). A copper sleeve (11) is installed on the outer side of the crankshaft (8), and the outer side of the copper sleeve (11) is fitted with... An elliptical rotor (15) is provided, and two rotor seals (14) are provided inside the elliptical rotor (15). Multiple rotor fixing bolts (12) are threaded inside the elliptical rotor (15). An internal gear (13) is rotatably connected to the outside of the rotor fixing bolts (12). Multiple rotor fixing nuts (16) are threaded inside the elliptical rotor (15). An internal gear (13) is rotatably connected to the outside of the rotor fixing nuts (16). The internal gear (13) meshes with the external gear ring (3). A fixing component is provided between the front cylinder head (2) and the rear cylinder body (17).
[0025] Specifically, the front cylinder head (2) provides an installation position for the external gear fixing screw (4) and cooperates with the rear cylinder body (17) to fix the cylinder body (7) and other components together under the action of the fixing assembly; the external gear fixing screw (4) is used to connect the front cylinder head (2) and the external gear ring (3) and enable the external gear ring (3) to rotate on its outside; the external gear ring (3) is used to mesh with the internal gear (13) and provide a track for the movement of the internal gear (13); the cylinder body (7) is used to accommodate the elliptical rotor (15) and other components, and the groove inside is used to install the sealing ring (6) to provide a working cavity for the pump; the sealing ring (6) is used to prevent fluid leakage inside the pump and ensure the pump's sealing performance; the cylinder body top seal (5) is used to seal the cylinder body (7) to further prevent fluid leakage; the crankshaft (8) is used to input external power and drive the connected components to move; A copper bushing (11) is installed on the outside of the crankshaft (8) to support the elliptical rotor (15) and reduce the friction between it and the crankshaft (8). The elliptical rotor (15) rotates under the drive of the crankshaft (8), and changes its shape to change the volume inside the pump, thereby achieving the intake and discharge of fluid. The rotor seal (14) is used to enhance the sealing performance of the elliptical rotor (15) and reduce fluid leakage. The rotor fixing bolt (12) and rotor fixing nut (16) are used to fix the internal gear (13) on the elliptical rotor (15) so that they can move synchronously. The internal gear (13) meshes with the external gear ring (3) and moves around the external gear ring (3) under the drive of the crankshaft (8), thereby driving the elliptical rotor (15) to rotate. The fixing assembly is used to fix the front cylinder head (2), cylinder body (7) and rear cylinder body (17) together to ensure the overall structural stability of the pump.
[0026] Reference Figure 1 - Figure 3 The outer side of the front cylinder head (2) is located outside the sealing ring (6). The fixing assembly includes multiple cylinder bolts (1). The outer side of the cylinder bolts (1) is rotatably connected to the inside of the front cylinder head (2). The outer side of the cylinder bolts (1) is threaded with a cylinder nut (19). The crankshaft (8) is provided with a keyway inside. A flat key (9) is installed inside the keyway. The outer side of the sealing ring (6) is located outside the rear cylinder block (17). The outer side of the cylinder bolts (1) is rotatably connected to the inside of the rear cylinder block (17). The outer side of the cylinder bolts (1) is rotatably connected to the inside of the cylinder block (7). A positioning pin (18) is provided inside the rear cylinder block (17). Shaft retaining rings (10) are installed at both ends of the copper sleeve (11).
[0027] Specifically, the outer side of the front cylinder head (2) is set outside the sealing ring (6) to enhance the sealing performance of the front end of the pump body and provide an installation base for components such as the external gear fixing screw (4); the outer side of the sealing ring (6) is set outside the rear cylinder body (17) to prevent leakage of the pump medium and ensure the sealing effect between the front cylinder head (2), cylinder body (7) and rear cylinder body (17); the outer side of the cylinder body bolt (1) is rotatably connected to the inside of the front cylinder head (2), cylinder body (7) and rear cylinder body (17) and is fastened by the cylinder body nut (19) with external thread connection, which is used to secure the front cylinder head (2), cylinder body (7) and rear cylinder body (17) together. The components are fixed together to ensure the stability of the pump body structure; the cylinder nut (19) is used to cooperate with the cylinder bolt (1) and tighten it to firmly connect the components; the keyway inside the crankshaft (8) is used to install the flat key (9). The keyway and the flat key (9) cooperate to transmit external power so that the crankshaft (8) can drive the connected components to rotate; the positioning pin (18) inside the rear cylinder (17) is used to accurately determine the relative position of the rear cylinder (17) and other components to ensure installation accuracy; the shaft snap rings (10) installed at both ends of the copper sleeve (11) are used to limit the axial movement of the copper sleeve (11) and related components to ensure the stability of the component position in the axial direction.
[0028] Working principle: The crankshaft (8) is a power input component. A keyway with a flat key (9) is installed inside the crankshaft (8) to transmit externally input torque. A copper sleeve (11) is installed on the outside of the crankshaft (8). A shaft retainer (10) is installed at both ends of the copper sleeve (11) to prevent the axial movement of related components. An elliptical rotor (15) is sleeved on the outside of the copper sleeve (11). Two rotor seals (14) are installed inside the elliptical rotor (15) to enhance the sealing effect. The elliptical rotor (15) is connected to the internal gear (13) through multiple rotor fixing bolts (12) and rotor fixing nuts (16). The internal gear (13) can rotate outside the rotor fixing bolts (12) and rotor fixing nuts (16), and the internal gear (13) meshes with the external gear ring (3).
[0029] When the external power drives the crankshaft (8) to rotate, the crankshaft (8) drives the elliptical rotor (15) to move through the copper sleeve (11). Due to the meshing relationship between the internal gear (13) and the external gear ring (3), the internal gear (13) will make a circular motion around the external gear ring (3), thereby driving the elliptical rotor (15) to rotate in a specific manner inside the cylinder (7). As the elliptical rotor (15) rotates inside the cylinder (7), the volume inside the cylinder (7) will change periodically. When the volume increases, a negative pressure is formed at the pump inlet, and the fluid is drawn into the cylinder (7) under the action of the pressure difference. When the volume decreases, the fluid inside the cylinder is squeezed, the pressure increases, and it is discharged from the pump outlet. By controlling the speed, direction and other parameters of the crankshaft (8), the pump flow rate and delivery direction can be adjusted, thereby meeting the fluid delivery needs under different working conditions.
[0030] Reference Figure 4 The operating sequence of an adjustable flow rotor volumetric pump based on an elliptical rotor engine is as follows: At moment one, the volume of the upper oil chamber is at its minimum, and the elliptical rotor (15) rotates counterclockwise, increasing the volume of the upper oil chamber and creating a negative pressure, resulting in an internal pressure lower than the pressure in the oil inlet pipe. The check valve at the oil inlet opens due to the pressure difference, and oil begins to enter. At moment two, the volume of the upper oil chamber continues to increase, so the check valve at the oil inlet remains open, while the check valve at the oil outlet does not have a positive pressure difference and remains normally closed, and oil continues to enter. At moment three, the volume of the upper oil chamber reaches its maximum value and no longer increases, resulting in no pressure difference between the oil inlet pipe and the chamber, so the check valve at the oil inlet closes. As the elliptical rotor (15) rotates further, the volume of the upper oil chamber decreases and the pressure of the chamber increases. At time four, the pressure inside the upper oil chamber is greater than the pressure provided by the spring of the one-way valve of the oil outlet, so the one-way valve of the oil outlet opens, thereby outputting high-pressure oil. Then the elliptical rotor (15) rotates to time one, ending the pumping action of one chamber.
[0031] Specifically, the check valves for the two inlet ports are identical; the two ports are for increasing the oil flow rate. However, the spring strengths used for the check valves at outlet ports one and two are different, resulting in different pressure differences between the chamber and the outlet pipe required for the check valves to open. The spring at outlet port one can provide 200 kPa of pressure, while the spring at outlet port two can provide 400 kPa. When the engine speed reaches 2000 rpm, the pressure difference between the oil chamber and the outlet pipe is 200 kPa, causing the check valve at outlet port one to open and release high-pressure oil. When the engine speed reaches 4000 rpm, the flow rate at outlet port one has already reached its maximum value, so further increasing the engine speed will cause the pressure to increase further. When the engine speed reaches 6000 rpm, the check valves at both outlet ports are normally open; when the engine speed reaches 8000 rpm, both check valves at both outlet ports are fully open, and the flow rate reaches its maximum. The oil flow rate can be controlled not only by the rotation speed, but also by controlling the one-way valve.
[0032] Reference Figure 5 The control process of an adjustable flow rotary volumetric pump based on an elliptical rotor engine is achieved through ECU control of input torque and one-way valve switching. First gear: Input torque maintains the machine speed at 1000 rpm, controls the one-way valve of oil outlet No. 1 to open, and the one-way valve of oil outlet No. 2 to close; flow rate 100 m3 / h; Second gear: The input torque maintains the machine speed at 2000 rpm. The one-way valve at the first oil outlet automatically opens due to pressure, and the one-way valve at the second oil outlet closes; the flow rate is 200 m3 / h. Three gears: The input torque maintains the machine speed at 3000 rpm, the one-way valve at oil outlet No. 1 automatically opens due to pressure, and controls the one-way valve at oil outlet No. 2 to close; flow rate 300 m3 / h; Fourth gear: The input torque maintains the machine speed at 4000 rpm. The one-way valve at the first oil outlet automatically opens due to pressure, controlling the opening of the one-way valve at the second oil outlet; flow rate 400 m3 / h; Fifth gear: The input torque maintains the machine speed at 5000 rpm. The one-way valve at oil outlet No. 1 opens automatically due to pressure, controlling the opening of the one-way valve at oil outlet No. 2; Flow rate 500 m3 / h; Sixth gear: The input torque maintains the machine speed at 6000 rpm. The one-way valve at the No. 1 oil outlet automatically opens due to pressure, controlling the opening of the one-way valve at the No. 2 oil outlet; Flow rate 600 m3 / h; Seventh gear: The input torque maintains the machine speed at 7000 rpm, and the one-way valves at oil outlet ports 1 and 2 open due to the pressure difference; flow rate 700 m3 / h; Eighth gear: The input torque maintains the machine speed at 8000 rpm. Due to the pressure difference, both the No. 1 and No. 2 oil outlet check valves are fully open, and the flow rate reaches its maximum; the flow rate is 800 m3 / h.
[0033] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. An adjustable flow rotary volumetric pump based on an elliptical rotor engine, comprising a front cylinder head (2), a cylinder block (7), a rear cylinder block (17), and a crankshaft (8), characterized in that: The front cylinder head (2) is internally threaded with multiple external gear fixing screws (4), and an external gear ring (3) is rotatably connected to the outside of the external gear fixing screws (4). The cylinder body (7) has a groove inside, and two sealing rings (6) are installed inside the groove. The cylinder body (7) has a cylinder top seal (5) installed inside. The crankshaft (8) has a copper sleeve (11) installed on the outside. An elliptical rotor (15) is sleeved on the outside of the copper sleeve (11). The elliptical rotor (15) has two rotor seals (14) inside. The elliptical rotor (15) is internally threaded with multiple rotor fixing bolts (12), and an internal gear (13) is rotatably connected to the outside of the rotor fixing bolts (12). The elliptical rotor (15) is internally threaded with multiple rotor fixing nuts (16), and an internal gear (13) is rotatably connected to the outside of the rotor fixing nuts (16). The internal gear (13) meshes with the external gear ring (3). A fixing assembly is provided between the front cylinder head (2) and the rear cylinder body (17).
2. The adjustable flow rotor positive displacement pump based on an elliptical rotor engine according to claim 1, characterized in that: The front cylinder head (2) is located on the outside of the sealing ring (6).
3. The adjustable flow rotary positive displacement pump based on an elliptical rotor engine according to claim 1, characterized in that: The fixing assembly includes a plurality of cylinder bolts (1), the outer side of which is rotatably connected to the inside of the front cylinder head (2), and the outer side of which is threaded with a cylinder nut (19).
4. The adjustable flow rotor positive displacement pump based on an elliptical rotor engine according to claim 1, characterized in that: The crankshaft (8) has a keyway inside, and a flat key (9) is installed inside the keyway.
5. An adjustable flow rotary positive displacement pump based on an elliptical rotor engine according to claim 1, characterized in that: The sealing ring (6) is located on the outer side of the rear cylinder (17).
6. An adjustable flow rotary positive displacement pump based on an elliptical rotor engine according to claim 3, characterized in that: The cylinder bolt (1) is rotated on the outside to connect to the inside of the rear cylinder (17), and the cylinder bolt (1) is rotated on the outside to connect to the inside of the cylinder (7).
7. An adjustable flow rotary positive displacement pump based on an elliptical rotor engine according to claim 3, characterized in that: The rear cylinder (17) is provided with a positioning pin (18).
8. An adjustable flow rotary positive displacement pump based on an elliptical rotor engine according to claim 1, characterized in that: Both ends of the copper sleeve (11) are equipped with shaft retaining rings (10).