Energy-saving hydraulic system

Abstract

The invention discloses an energy-saving hydraulic system which comprises an executing mechanism, a hydraulic pipe, an energy saver, an oil pump and an oil storage tank, the oil storage tank, the oil pump, the hydraulic pipe and the executing mechanism are sequentially communicated, the executing mechanism is communicated with the oil storage tank through a main return pipe, the energy saver is arranged on the hydraulic pipe, and the oil pump is communicated with the oil storage tank. The energy saver comprises an outer pipe, an inner pipe, a first piston, a first spring and a sealing cover, the inner pipe is arranged in the outer pipe, a one-way valve is arranged at the left end of the inner pipe, and the first piston, the first spring and the sealing cover are sequentially arranged between the outer pipe and the inner pipe from left to right. The first piston divides a cavity in front of the outer pipe and the inner pipe into a left cavity and a right cavity, the first spring is used for pushing the first piston to move towards the left end, and the right cavity is communicated with the oil storage tank through an auxiliary backflow pipe. Kinetic energy of hydraulic oil in the pipeline when the executing mechanism stops working is utilized, the response speed of restarting of the hydraulic system is increased, and energy consumption is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic systems, and in particular to an energy-saving hydraulic system. Background Art

[0002] In existing hydraulic systems, especially in application scenarios where actuators need to be started and stopped frequently, such as automated production lines and construction machinery, the energy consumption problem of hydraulic systems is particularly prominent. Traditional hydraulic systems usually rely on the continuous operation of the oil pump to maintain the oil pressure in the hydraulic pipes and actuators. Even when the actuator is not in operation, the oil pump often keeps running, which not only wastes energy, but also increases the operating cost of the system and the wear of the equipment.

[0003] In addition, when restarting the traditional hydraulic system, the hydraulic oil re-pressurization process takes a certain amount of time, which limits the response speed of the actuator and affects the overall work efficiency. At the same time, due to the lack of effective energy-saving mechanisms in the hydraulic system, a large amount of hydraulic energy is wasted when the actuator stops working, further exacerbating the energy consumption problem. Summary of the invention

[0004] In view of the above-mentioned prior art, the present invention provides an energy-saving hydraulic system, which utilizes the kinetic energy of the hydraulic oil in the pipeline when the actuator stops working, thereby improving the response speed of the hydraulic system when restarting and reducing energy consumption.

[0005] To achieve the above object, the technical solution of the embodiment of the present invention is implemented as follows:

[0006] An energy-saving hydraulic system comprises an actuator, a hydraulic pipe, an economizer, an oil pump and an oil storage tank, wherein the oil storage tank, the oil pump, the hydraulic pipe and the actuator are connected in sequence, the actuator is connected to the oil storage tank through a main return pipe, the hydraulic pipe is provided with the economizer, the economizer comprises an outer pipe, an inner pipe, a first piston, a first spring and a cover, the inner pipe is provided in the outer pipe, a one-way valve is provided at the left end of the inner pipe, the first piston, the first spring and the cover are provided between the outer pipe and the inner pipe from left to right, the first piston divides the cavity between the outer pipe and the inner pipe into a left cavity and a right cavity, the first spring is used to push the first piston to move to the left end, and the right cavity is connected to the oil storage tank through a secondary return pipe.

[0007] Furthermore, the energy saver also includes an upper piston, an upper spring, an upper cross channel, a lower piston, a lower spring, and a lower cross channel arranged in the cover, the left end of the upper cross channel is connected to the right cavity, the right end is connected to the right side of the cover, the lower end is connected to the inner tube, the upper end is provided with the upper spring and connected to the auxiliary return pipe, the upper piston is arranged in the longitudinal inner cavity of the upper cross channel, the upper piston is provided with a first transverse through hole, the left end of the lower cross channel is connected to the right cavity, the upper end is connected to the inner tube, the right end and the lower end are connected to the auxiliary return pipe, and the lower end is provided with the lower spring, the lower piston is arranged in the longitudinal inner cavity of the lower cross channel, and the lower piston is provided with a second transverse through hole.

[0008] Furthermore, the upper spring and the lower spring are both coil springs.

[0009] Furthermore, the upper piston and the lower piston are cylindrical pistons, the cross-sections of the upper piston and the lower piston are polygonal, and the edges of the polygons are chamfered.

[0010] Furthermore, the one-way valve includes a spherical valve core, a second spring and a valve seat, the spherical valve core and the second spring are arranged in the valve seat, the left side of the valve seat is connected to the inner tube, and the second spring is used to push the spherical valve core to close the opening of the inner tube.

[0011] Furthermore, the first spring and the second spring are both coil springs.

[0012] Furthermore, first limiting protrusions are provided at the upper end and the lower end of the upper piston in the upper cross channel.

[0013] Furthermore, second limiting protrusions are provided at the upper end and the lower end of the lower piston in the lower cross channel.

[0014] Furthermore, a C-shaped channel is provided in the cover, the C-shaped channel is connected to the auxiliary return pipe, and the right end of the upper cross channel and the lower end and the right end of the lower cross channel are all connected to the C-shaped channel.

[0015] The beneficial effect of the present invention is that when the actuator stops moving, the control valve closes the oil outlet end of the hydraulic pipe, and then the oil pump stops working. The hydraulic oil in the pipeline continues to flow under the action of inertia to generate high pressure in the left cavity, thereby pushing the first piston to move to the right and compressing the first spring to store energy. At the same time, the hydraulic oil in the right cavity returns to the oil storage cavity through the auxiliary return pipe. When the actuator performs the action again, the control valve opens the oil outlet end of the hydraulic pipe, and the oil pump also starts working. The first piston moves to the right under the push of the first spring, so that the oil pressure in the hydraulic pipe can rise quickly, and the corresponding speed of restarting is improved. After the actuator stops working, the oil pump stops working to reduce energy consumption. The present invention can also utilize the hydraulic kinetic energy in the hydraulic pipe to reduce energy consumption and improve energy saving effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of an energy-saving hydraulic system in an embodiment of the present application;

[0017] Figure 2 This is a schematic diagram of the cross-sectional structure of the energy saver in the embodiment of the present application;

[0018] Figure 3 For this application Figure 2 A magnified image of area A;

[0019] Figure 4 This is a schematic diagram of the cross-sectional structure of the cover in the embodiment of the present application;

[0020] Description of Figure Numbers:

[0021] 1. Actuator; 2. Hydraulic pipe; 3. Energy saver; 4. Oil pump; 5. Oil storage tank; 6. Main return pipe; 7. Outer pipe; 8. Inner pipe; 9. First piston; 10. First spring; 11. One-way valve; 12. Cover; 13. Left cavity; 14. Right cavity; 15. Secondary return pipe; 16. Upper piston; 17. Upper spring; 18. Upper cross channel; 19. Lower piston; 20. Lower spring; 21. Lower cross channel; 22. First through hole; 23. Second through hole; 24. Spherical valve core; 25. Second spring; 26. Valve seat; 27. First limit protrusion; 28. Second limit protrusion; 29. ​​C-type channel. DETAILED DESCRIPTION

[0022] The technical solution of the present invention is further elaborated in detail below in conjunction with the drawings and specific embodiments of the specification. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. In the following description, the expression "some embodiments" is related to a subset of all possible embodiments, but it should be understood that "some embodiments" can be the same subset or different subsets of all possible embodiments, and can be combined with each other without conflict.

[0023] It should also be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "inside", "outside", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0024] Please refer to the attached Figures 1 to 4 The present application provides an energy-saving hydraulic system, including an actuator 1, a hydraulic pipe 2, an economizer 3, an oil pump 4 and an oil storage tank 5, wherein the oil storage tank 5, the oil pump 4, the hydraulic pipe 2 and the actuator 1 are connected in sequence, the actuator 1 is connected to the oil storage tank 5 through a main return pipe 6, the hydraulic pipe 2 is provided with the economizer 3, the economizer 3 includes an outer pipe 7, an inner pipe 8, a first piston 9, a first spring 10 and a cover 12, the inner pipe 8 is provided in the outer pipe 7, a one-way valve 11 is provided at the left end of the inner pipe 8, the first piston 9, the first spring 10 and the cover 12 are provided between the outer pipe 7 and the inner pipe 8 from left to right, the first piston 9 divides the cavity between the outer pipe 7 and the inner pipe 8 into a left cavity 13 and a right cavity 14, the first spring 10 is used to push the first piston 9 to move to the left end, and the right cavity 14 is connected to the oil storage tank 5 through the auxiliary return pipe 15

[0025] When the oil pump 4 is working, it pumps the hydraulic oil in the oil storage tank 5 into the hydraulic pipe 2, and supplies high-pressure hydraulic oil to the actuator 1 through the hydraulic pipe 2. The actuator 1 can be a hydraulic telescopic rod, etc. The hydraulic oil after passing through the actuator 1 flows back to the oil storage tank 5 through the main return pipe 6.

[0026] When the oil pump 4 is working, the high-pressure hydraulic oil enters the left cavity 13 through the inner tube 8, and then flows to the actuator 1 from the hydraulic pipe 2 connected through the left cavity 13. A one-way valve 11 is provided at the left end of the inner tube 8 to prevent the hydraulic oil in the left cavity 13 from flowing back into the inner tube 8.

[0027] When the actuator 1 stops moving, the control valve closes the oil outlet end of the hydraulic pipe 2, and then the oil pump 4 stops working. The hydraulic oil in the pipeline continues to flow under the action of inertia to generate high pressure in the left cavity 13, thereby pushing the first piston 9 to move right and compressing the first spring 10 to store energy. At the same time, the hydraulic oil in the right cavity 14 returns to the oil storage cavity through the auxiliary return pipe 15.

[0028] When the actuator 1 performs an action again, the control valve opens the oil outlet end of the hydraulic pipe 2, the oil pump 4 also starts to work, and the first piston 9 moves to the right under the push of the first spring 10, so that the oil pressure in the hydraulic pipe 2 can rise quickly, and the corresponding speed of restarting is improved. After the actuator 1 stops working, the oil pump 4 stops working to reduce energy consumption. The present invention can also use the hydraulic kinetic energy in the hydraulic pipe 2 to reduce energy consumption and improve energy saving effect.

[0029] Specifically, the energy saver 3 also includes an upper piston 16, an upper spring 17, an upper cross channel 18, a lower piston 19, a lower spring 20, and a lower cross channel 21 arranged in the cover 12, the left end of the upper cross channel 18 is connected to the right cavity 14, the right end is connected to the right side of the cover 12, the lower end is connected to the inner tube 8, the upper end is provided with the upper spring 17 and connected to the auxiliary return pipe 15, the upper piston 16 is arranged in the longitudinal inner cavity of the upper cross channel 18, the upper piston 16 is provided with a transverse first through hole 22, the left end of the lower cross channel 21 is connected to the right cavity 14, the upper end is connected to the inner tube 8, the right end and the lower end are connected to the auxiliary return pipe 15, and the lower end is provided with the lower spring 20, the lower piston 19 is arranged in the longitudinal inner cavity of the lower cross channel 21, and the lower piston 19 is provided with a transverse second through hole 23.

[0030] When the actuator 1 is in continuous operation and the oil pump 4 and the economizer 3 are in a stable state, the pressure in the inner tube 8 is high, and the inner tube 8 pushes the upper piston 16 to move upward and compresses the upper spring 17, so that the first through hole 22 is offset from the left and right ends of the upper cross channel 18, and the right cavity 14 cannot be connected to the inner tube 8 through the upper cross channel 18; the inner tube 8 pushes the lower piston 19 to move downward and compresses the lower spring 20, so that the second through hole 23 is connected to the left and right ends of the lower cross channel 21, and the right cavity 14 is connected to the oil storage tank through the lower cross channel 21.

[0031] When the actuator 1 stops working, the pressure in the inner tube 8 remains high, and the positions of the upper piston 16 and the lower piston 19 remain unchanged. Since the control valve closes the oil outlet of the hydraulic pipe 2, the hydraulic oil in the pipe forms a high pressure in the left cavity 13 due to inertia impact, thereby pushing the first piston 9 to move rightward to compress the first spring 10 and store the kinetic energy in the pipe. When the first piston 9 moves rightward, the hydraulic oil in the right cavity 14 returns to the oil storage tank 5 through the lower cross channel 21 and the auxiliary oil return pipe.

[0032] When the actuator 1 stops working for a period of time, the pressure in the inner tube 8 decreases. At this time, the one-way valve 11 prevents the hydraulic oil from entering the inner tube 8 from the left cavity 13, and the upper piston 16 moves downward under the action of the upper spring 17, so that the first through hole 22 is gradually aligned with the left and right ends of the upper cross channel 18, and the right cavity 14 is gradually connected with the inner tube 8 through the upper cross channel 18; under the action of the lower spring 20, the lower piston 19 moves upward, so that the second through hole 23 is staggered with the left and right ends of the lower cross channel 21, and the right cavity 14 cannot be connected with the oil storage pipe through the lower cross channel 21.

[0033] When the actuator 1 operates again, the control valve opens the oil outlet end of the hydraulic pipe 2, the oil pump 4 is turned on, and the hydraulic oil in the left cavity 13 is discharged to supply hydraulic oil to the actuator 1, which can increase the corresponding speed of supplying high-pressure hydraulic oil to the actuator 1. After the oil pump 4 works, the pressure of the inner tube 8 also increases. When the pressure of the inner tube 8 increases too slowly, the positions of the upper piston 16 and the lower piston 19 remain unchanged in the initial stage. When the first piston 9 moves to the left, it will attract the hydraulic oil in the inner tube 8 into the right cavity 14, so as to use the first piston 9 to drive the oil pump 4 to start quickly, further promoting the corresponding speed of the system. When the pressure of the inner tube 8 rises to a certain level, the upper piston 16 and the lower piston 19 are reset to the initial state, that is, the inner tube 8 pushes the upper piston 16 to move upward and compresses the upper spring 17, so that the first through hole 22 is staggered with the left and right ends of the upper cross channel 18, and the right cavity 14 cannot be connected with the inner tube 8 through the upper cross channel 18 at this time; the inner tube 8 pushes the lower piston 19 to move downward and compresses the lower spring 20, so that the second through hole 23 is connected with the left and right ends of the lower cross channel 21, and the right cavity 14 is connected with the oil storage tank through the lower cross channel 21.

[0034] Specifically, the upper spring 17 and the lower spring 20 are both coil springs, which can provide a stable elastic force, and the upper spring 17 and the lower spring 20 are both immersed in the hydraulic oil, so the service life is long. The moving parts are all located in the cavity, which can prevent the leakage of the hydraulic oil.

[0035] Specifically, the upper piston 16 and the lower piston 19 are cylindrical pistons, and the cross-sections of the upper piston 16 and the lower piston 19 are polygonal, and the edges of the polygons are chamfered, so as to prevent the upper piston 16 and the lower piston 19 from deflecting during the movement.

[0036] Specifically, the one-way valve 11 includes a spherical valve core 24, a second spring 25 and a valve seat 26. The spherical valve core 24 and the second spring 25 are arranged in the valve seat 26. The left side of the valve seat 26 is connected to the inner tube 8. The second spring 25 is used to push the spherical valve core 24 to close the opening of the inner tube 8. Under the action of the second spring 25, the spherical valve core 24 moves toward the inner tube 8, thereby blocking the inner tube 8. When the pressure in the inner tube 8 is high, the hydraulic oil in the inner tube 8 pushes the spherical valve core 24 to be discharged. When the pressure in the inner tube 8 decreases and the pressure in the left cavity 13 is high, the spherical valve core 24 is tightly pressed against the opening of the inner tube 8 under the action of the hydraulic oil, thereby blocking the inner tube 8 and preventing the hydraulic oil from flowing back into the inner tube 8.

[0037] Specifically, the first spring 10 and the second spring 25 are both coil springs, which can provide a stable elastic force, and the first spring 10 and the second spring 25 are both immersed in hydraulic oil, so they have a long service life. The moving parts are all located in the cavity, which can prevent leakage of hydraulic oil.

[0038] Specifically, first limiting protrusions 27 are provided at the upper and lower ends of the upper piston 16 in the upper cross channel 18 to limit the upper piston 16 to move upward and downward to ensure that the upper piston 16 can communicate with the left and right ends of the upper cross channel 18.

[0039] Specifically, second limiting protrusions 28 are provided at the upper and lower ends of the lower piston 19 in the lower cross channel 21 to limit the upper and lower movement of the lower piston 19 and ensure that the lower piston 19 can communicate with the left and right ends of the lower cross channel 21.

[0040] Specifically, a C-shaped channel 29 is provided in the cover 12, and the C-shaped channel 29 is connected to the secondary return pipe 15, and the right end of the upper cross channel 18 and the lower end and right end of the lower cross channel 21 are all connected to the C-shaped channel 29. After the C-shaped channel 29 connects the right end of the upper cross channel 18 and the lower end and right end of the lower cross channel 21, and then connects to the secondary return pipe, it can ensure that the right end of the upper cross channel 18 and the lower end and right end of the lower cross channel 21 are in a normal pressure state, and the moving parts can be located in the cavity and immersed in the hydraulic oil, which can prevent the leakage of the hydraulic oil.

[0041] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. The protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An energy-saving hydraulic system, characterized in that: It includes an actuator, a hydraulic pipe, an economizer, an oil pump and an oil storage tank. The oil storage tank, the oil pump, the hydraulic pipe and the actuator are connected in sequence. The actuator is connected to the oil storage tank through a main return pipe. The energy saver is arranged on the hydraulic pipe. The economizer includes an outer tube, an inner tube, a first piston, a first spring and a cover. The inner tube is arranged in the outer tube. A one-way valve is arranged at the left end of the inner tube. The first piston, the first spring and the cover are arranged between the outer tube and the inner tube from left to right. The first piston divides the cavity between the outer tube and the inner tube into a left cavity and a right cavity. The first spring is used to push the first piston to move to the left end. The right cavity is connected to the oil storage tank through a secondary return pipe.

2. An energy-saving hydraulic system according to claim 1, characterized in that: The energy saver also includes an upper piston, an upper spring, an upper cross channel, a lower piston, a lower spring, and a lower cross channel arranged in the cover, the left end of the upper cross channel is connected to the right cavity, the right end is connected to the right side of the cover, the lower end is connected to the inner tube, the upper end is provided with the upper spring and connected to the auxiliary return pipe, the upper piston is arranged in the longitudinal inner cavity of the upper cross channel, the upper piston is provided with a first transverse through hole, the left end of the lower cross channel is connected to the right cavity, the upper end is connected to the inner tube, the right end and the lower end are connected to the auxiliary return pipe, and the lower end is provided with the lower spring, the lower piston is arranged in the longitudinal inner cavity of the lower cross channel, and the lower piston is provided with a second transverse through hole.

3. An energy-saving hydraulic system according to claim 2, characterized in that: The upper spring and the lower spring are both coil springs.

4. An energy-saving hydraulic system according to claim 2, characterized in that: The upper piston and the lower piston are cylindrical pistons, and the cross sections of the upper piston and the lower piston are polygonal, and the edges of the polygons are chamfered.

5. The energy-saving hydraulic system according to claim 1, characterized in that: The one-way valve includes a spherical valve core, a second spring and a valve seat. The spherical valve core and the second spring are arranged in the valve seat. The left side of the valve seat is connected to the inner tube. The second spring is used to push the spherical valve core to close the opening of the inner tube.

6. An energy-saving hydraulic system according to claim 5, characterized in that: The first spring and the second spring are both coil springs.

7. An energy-saving hydraulic system according to claim 2, characterized in that: The upper cross channel is provided with first limiting protrusions at the upper end and the lower end of the upper piston.

8. An energy-saving hydraulic system according to claim 2, characterized in that: Second limiting protrusions are provided in the lower cross channel at the upper end and the lower end of the lower piston.

9. An energy-saving hydraulic system according to claim 2, characterized in that: A C-shaped channel is provided in the sealing cover, and the C-shaped channel is communicated with the auxiliary return pipe. The right end of the upper cross channel and the lower end and the right end of the lower cross channel are all communicated with the C-shaped channel.

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