Energy storage hydraulic amplifier and method of operation

Abstract

The application provides an energy storage hydraulic amplifier and a working method. The energy storage hydraulic amplifier comprises an oil tank, a first reversing valve, a first energy accumulator, a second energy accumulator, a pressure amplifier and a second reversing valve; an oil inlet path and an oil return path are communicated between the oil tank and the first reversing valve; the oil inlet path is communicated with a third normally open electromagnetic valve, a sixth check valve, a seventh check valve and the first reversing valve; the oil inlet path is communicated with the second energy accumulator; the oil inlet path is communicated with the second reversing valve, the pressure amplifier and the first reversing valve in sequence; the oil return path is communicated with a second normally open electromagnetic valve and the second energy accumulator; a fifth branch is communicated with a first normally open electromagnetic valve and the first energy accumulator; the first energy accumulator is communicated with a third normally closed electromagnetic valve and the first reversing valve in sequence; and a fourth normally open electromagnetic valve is communicated with the second energy accumulator. The application adopts a double-cavity energy accumulator and a hierarchical energy storage technology, realizes full-mode recovery of potential energy, kinetic energy and residual pressure energy, and improves the energy utilization rate to 90%.

Description

Technical Field

[0001] This invention relates to the field of hydraulic transmission technology, and in particular to an energy storage hydraulic amplifier and its working method. Background Technology

[0002] Current hydraulic transmission systems generally suffer from problems such as high energy loss, poor dynamic performance, and limited pressure amplification, specifically:

[0003] ① Traditional hydraulic amplifiers: energy utilization rate is only 55%-65%, and energy loss in the return oil circuit accounts for 35%-45%.

[0004] ② Multistage valve-controlled hydraulic amplifier (CN20181012345.6): Although it can achieve 3-4 times pressure amplification, its volume increases by 40%-60%, and it has no energy recovery function.

[0005] ③ Spring accumulator system (Hydraulics and Pneumatics, 2020.5): It can only partially recover kinetic energy and is suitable for low-frequency, light-load equipment, but cannot meet high dynamic requirements. Summary of the Invention

[0006] The purpose of this invention is to provide an energy storage hydraulic amplifier and its working method, which adopts a dual-cavity energy storage device and staged energy storage technology to achieve full-mode recovery of potential energy, kinetic energy and residual pressure energy, and improve the energy utilization rate to 90%.

[0007] The technical solution of the present invention is: an energy storage hydraulic amplifier, comprising an oil tank, a first reversing valve for connection with an actuator, a first energy storage device, a second energy storage device, a pressure amplifier, and a second reversing valve for reversing the inlet and outlet oil entering the pressure amplifier;

[0008] The oil tank and the first directional valve are connected by an oil inlet line and an oil return line. The oil inlet line comes out of the oil tank and splits into a first branch and a second branch. The first branch is connected in sequence to the third normally open solenoid valve, the sixth check valve, the seventh check valve and the first directional valve. The second branch is connected to the second energy storage device. A third branch is further split from the first branch. The third branch is connected in sequence to the second directional valve, the pressure amplifier and the first directional valve. The second energy storage device is connected to the third branch through a first pipeline.

[0009] The return oil circuit branches into a fourth branch and a fifth branch from the oil tank. The fourth branch connects to the second normally open solenoid valve and the second accumulator. The fifth branch connects to the first normally open solenoid valve and the first accumulator. The first accumulator is connected to the third normally closed solenoid valve and the first directional valve via a second pipeline. The first accumulator is also connected to the first pipeline via a third pipeline. A sixth branch is connected to the second pipeline. The sixth branch is connected to the second accumulator via the fourth normally open solenoid valve and is also connected to the second directional valve.

[0010] Preferably, the energy storage hydraulic amplifier further includes a drive energy storage unit connected to the first energy storage unit via a fourth pipeline, and the fourth pipeline is provided with a first normally closed solenoid valve.

[0011] Preferably, the first energy storage device is provided with a first limit switch, which serves as a signal source for opening the first normally closed solenoid valve, closing the first normally open solenoid valve, closing the third normally closed solenoid valve, and opening the fourth normally open solenoid valve.

[0012] The second energy storage device is equipped with a second limit switch, which serves as a signal source for opening the second normally closed solenoid valve, closing the second normally open solenoid valve, closing the fourth normally open solenoid valve, and opening the third normally closed solenoid valve.

[0013] Preferably, the second energy storage device is provided with a second driving cavity and a second energy storage cavity, the fourth pipeline is connected to the inlet of the first driving cavity, the fourth branch is connected to the outlet of the first driving cavity, the third pipeline is connected to the outlet of the second energy storage cavity, and a second pipeline is connected between the first reversing valve and the inlet of the second energy storage cavity.

[0014] Preferably, the first energy storage device is provided with a first driving cavity and a first energy storage cavity, the second branch is connected to the inlet of the first driving cavity, and the fourth branch is connected to the outlet of the first driving cavity; the first pipeline is connected to the outlet of the first energy storage cavity, and the sixth branch is connected to the inlet of the first energy storage cavity.

[0015] Preferably, a second overflow valve is connected to the second branch.

[0016] Preferably, a first relief valve is connected to the first branch, and the first relief valve is located between the third normally open solenoid valve and the sixth check valve.

[0017] Preferably, the first branch is connected to an oil circuit accumulator, and at least two oil circuit accumulators are connected in parallel on the first branch.

[0018] The present invention also provides a method for operating the above-mentioned energy storage hydraulic amplifier, comprising:

[0019] When the actuator advances rapidly, the hydraulic oil in the tank enters the first directional valve through the third normally open solenoid valve, the sixth check valve, and the seventh check valve, and is then injected into the actuator from the first directional valve. As the actuator advances rapidly, some hydraulic oil flows from the first branch into the third branch and is amplified by the pressure amplifier from the second directional valve. The amplified hydraulic oil then directly enters the actuator.

[0020] When the actuator is pressurized and reversed for unloading, the hydraulic oil in the actuator flows from the return oil line on the first reversing valve through the fourth normally open solenoid valve into the second accumulator for storage. At this time, the second pipeline leading to the first accumulator is closed. When the amount stored in the second accumulator reaches the set value, the hydraulic oil in the second accumulator is discharged from the second accumulator through the first pipeline to the pressure amplifier for amplification.

[0021] The hydraulic oil in the actuator enters the first accumulator through the return oil line on the first directional valve and the third normally closed solenoid valve; at this time, the sixth branch leading to the second accumulator is closed; when the amount stored in the first accumulator reaches the set value, the hydraulic oil in the first accumulator is discharged through the third pipeline to the pressure amplifier for amplification;

[0022] The energy recovery and reuse are completed through repeated cycles.

[0023] Compared with related technologies, the beneficial effects of the present invention are as follows:

[0024] I. This invention employs a dual-cavity accumulator and staged energy storage technology to achieve full-mode recovery of potential energy, kinetic energy, and residual pressure energy, increasing energy utilization to 90%.

[0025] II. This invention achieves a pressure amplification factor of 1.5-10 times by employing an asymmetric cylinder block structure and a differential cylinder group module pressure amplifier.

[0026] Third, this invention coordinates the operation of the overflow valve and the solenoid valve assembly to achieve energy recycling and system command adjustment;

[0027] IV. This invention adopts the PQT coupling control algorithm + high-frequency solenoid valve group. The PQT coupling algorithm is a real-time collaborative control algorithm for pressure, flow and temperature, which makes the dynamic response time ≤50ms and supports high-precision control (≤10ms). Attached Figure Description

[0028] Figure 1 A schematic diagram of the energy storage hydraulic amplifier provided by the present invention.

[0029] In the attached diagram: 1. First directional control valve; 2. Oil tank; 3. Oil inlet circuit; 301. First branch; 302. Second branch; 303. Third branch; 4. Third normally open solenoid valve; 5. First relief valve; 6. Sixth check valve; 7. Oil accumulator; 8. Seventh check valve; 9. Fifth check valve; 10. Second directional control valve; 11. Pressure amplifier; 12. First check valve; 13. Second relief valve; 14. Drive accumulator; 15. Second normally closed solenoid valve; 16. Second accumulator; 161. Second drive chamber; 162. Second accumulator chamber; 17. Third check valve; 18. Fourth normally open solenoid valve; 19. Second normally open... 20. Solenoid valve; 201. Return oil circuit; 202. Fourth branch; 203. Fifth branch; 204. Sixth branch; 21. Fourth check valve; 22. Third normally closed solenoid valve; 23. Second check valve; 24. First accumulator; 241. First drive chamber; 242. First energy storage chamber; 25. First limit switch; 26. Second limit switch; 27. First normally closed solenoid valve; 28. First normally open solenoid valve; 29. ​​Second pipeline; 30. Hydraulic check valve; 31. First pipeline; 32. Third pipeline; 33. Fourth pipeline; 34. Motor; 35. Thermometer; 36. Liquid level control relay; 37. Air filter. Detailed Implementation

[0030] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other. For ease of description, the terms "upper," "lower," "left," and "right" used below only indicate that they correspond to the upper, lower, left, and right directions in the accompanying drawings and do not limit the structure.

[0031] like Figure 1 As shown, this embodiment provides an energy storage hydraulic amplifier including an oil tank 2, a first reversing valve 1 for connection to an actuator, a first energy storage unit 24, a second energy storage unit 16, a pressure amplifier 11, and a second reversing valve 10 for reversing the inlet and outlet oil entering the pressure amplifier 11. The first energy storage unit 24 has a first drive chamber 241 and a first energy storage chamber 242. A first limit switch 25 is provided on the first energy storage unit 24. The second energy storage unit 16 has a second drive chamber 161 and a second energy storage chamber 162. A second limit switch 26 is provided on the second energy storage unit 16.

[0032] An oil inlet line 3 and an oil return line 20 are connected between the oil tank 2 and the first directional valve 1. The oil inlet line 3, exiting from the oil tank 2, splits into a first branch 301 and a second branch 302. The first branch 301 is sequentially connected to the third normally open solenoid valve 4, the sixth one-way valve 6, the seventh one-way valve 8, and the first directional valve 1. The second branch 302 is sequentially connected to the first one-way valve 12, the drive accumulator 14, the second normally closed solenoid valve 15, and the inlet of the second drive chamber 161 of the second accumulator 16. A second overflow valve 13 is also connected to the second branch 302. The drive accumulator 14 contains a nitrogen chamber.

[0033] A third branch 303 branches off from the first branch 301. The third branch 303 is sequentially connected to the second directional valve 10, the pressure amplifier 11, and the first directional valve 1 to form an oil inlet. The outlet of the second energy storage chamber 162 of the second energy accumulator 16 is connected to the third check valve 17 and the third branch 303 through the first pipeline 31. The above circuit is the oil inlet circuit for supplying oil to the actuator.

[0034] The return oil circuit 20 branches into a fourth branch 201 and a fifth branch 202 from the oil tank 2. The fourth branch 201 connects to the outlet of the second normally open solenoid valve 19 and the second drive chamber 161 of the second energy accumulator 16. The fifth branch 202 connects to the outlet of the first normally open solenoid valve 28 and the first drive chamber 241 of the first energy accumulator 24. The inlet of the first energy storage chamber 242 of the first energy accumulator 24 is connected to the third normally closed solenoid valve 22 and the first directional valve 1 in sequence through the second pipeline 29. The outlet of the first energy storage chamber 242 of the first energy accumulator 24 is connected to the second check valve 23 and the first pipeline 31 through the third pipeline 32, which is also connected to the third branch 303. Two oil circuit accumulators 7 are provided at the intersection of the first branch 301 and the third branch 303. The connection point of the first pipeline 31 on the third branch 303 is located on the side of the fifth check valve 9 away from the oil circuit accumulators 7. The fifth check valve 9 prevents hydraulic oil on the third branch 303 from entering the first branch 301.

[0035] The second pipeline 29 is connected to the sixth branch 203. The sixth branch 203 is connected to the inlet of the second energy storage chamber 162 of the second energy storage device 16 through the fourth normally open solenoid valve 18. The sixth branch 203 is also connected to the second reversing valve 10 through the fourth one-way valve 21 to form a return oil circuit to the pressure amplifier 11.

[0036] The drive accumulator 14 is connected to the inlet of the first normally closed solenoid valve 27 and the second drive chamber 161 via the fourth pipeline 33. A motor 34 and a hydraulically controlled check valve 30 are installed at the end of the oil inlet 3 near the oil tank 2. The oil tank 2 contains a thermometer 35, a level control relay 36, and an air filter 37.

[0037] The hydraulic oil in the first drive chamber 241 returns to the oil tank 2 via the fourth branch 201, the second normally open solenoid valve 19, and the return oil line 20. The hydraulic oil in the second drive chamber 161 returns to the oil tank 2 via the fifth branch 202, the first normally open solenoid valve 28, and the return oil line 20.

[0038] The present invention also provides a method for operating the above-mentioned energy storage hydraulic amplifier, comprising the following steps:

[0039] When the actuator advances rapidly, the system requires lower pressure and faster oil supply. Hydraulic oil in tank 2 enters the first directional valve 1 via the third normally open solenoid valve 4, the sixth check valve 6, and the seventh check valve 8, and is then injected into the actuator from the first directional valve 1. As the actuator advances rapidly, some hydraulic oil flows from the first branch 301 into the third branch 303 and is amplified by the second directional valve 10 into the pressure amplifier 11; the amplified hydraulic oil then directly enters the actuator. Simultaneously, the seventh check valve 8 prevents hydraulic oil at the pressure set by the first relief valve 5 from entering the actuator. At this time, the hydraulic oil at the pressure set by the first relief valve 5 satisfies both the energy storage needs of the oil accumulator 7 and the oil demand of the amplified actuator.

[0040] When the actuator pressurizes and reverses to unload, the hydraulic oil in the actuator flows from the return oil passage 20 on the first reversing valve 1 through the fourth normally open solenoid valve 18 into the second accumulator 16 for storage. At this time, the second pipeline 29 leading to the first accumulator 24 is closed. When the amount stored in the second accumulator 16 reaches the set value, the second limit switch 26 acts as the opening signal source for the second normally closed solenoid valve 15 and the second normally open solenoid valve 19. The second normally closed solenoid valve 15 opens, and the second normally open solenoid valve 19 and the fourth normally open solenoid valve 18 close. At the same time, the third normally closed solenoid valve 22 opens, driving the relatively high-pressure hydraulic oil in the accumulator 14 into the second drive chamber 161, driving the hydraulic oil in the second storage chamber 162 to be discharged from the second accumulator 16, and then entering the pressure amplifier 11 through the first pipeline 31 for amplification.

[0041] Hydraulic oil in the actuator enters the first accumulator 24 from the return oil line 20 on the first directional valve 1 via the third normally closed solenoid valve 22 for storage; at this time, the sixth branch 203 leading to the second accumulator 16 is closed. When the storage amount in the first accumulator 24 reaches the set value, the first limit switch 25 sends a signal to the control system, and the system issues a command to control the first normally closed solenoid valve 27 to open, the first normally open solenoid valve 28 to close, the third normally closed solenoid valve 22 to close, and the fourth normally open solenoid valve 18 to open. The hydraulic oil in the first accumulator chamber 242 is discharged through the third pipeline 32 to the pressure amplifier 11 for amplification.

[0042] The energy recovery and reuse are completed through repeated cycles.

[0043] During the reciprocating motion of the energy storage device, the system oil pump only supplies enough oil to drive the energy storage device. The oil pump can be paused until the system needs it and then restarts to repeat the above process.

[0044] In addition, the system can be equipped with the following functions: PQT sensors monitor pressure, flow rate, and temperature in real time; an AI chip optimizes control commands through machine learning models; and an FPGA controller solves the hydraulic oscillation problem caused by the timing difference in turbocharger coordination.

[0045] Comparative Example

[0046] Table 1 shows a comparison of the parameters of the prior art and the present invention:

[0047] Table 1: Parameter Comparison Table

[0048]

[0049] This invention achieves multimodal energy recovery and reuse, employing a dual-cavity accumulator and staged energy storage technology to realize full-modal recovery of potential energy, kinetic energy, and residual pressure energy, increasing energy utilization to 90%. This invention uses an FPGA-based real-time collaborative controller combined with a PQT (pressure-flow-temperature) coupling algorithm to solve the problem of dynamic response hysteresis, improving dynamic gain by 20%-40%. This invention adopts a modular design to adapt to engineering machinery, aerospace, and other scenarios, reducing installed power requirements by 30% and maintenance costs by 30%, solving the problem of insufficient adaptability of existing systems and achieving a reduction in total lifecycle costs. This invention breaks through traditional efficiency bottlenecks; through energy recycling, equipment energy consumption is reduced by 30%-40%, and the pressure amplification factor is increased to 2-3 times that of traditional systems.

[0050] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A storable hydraulic amplifier, comprising an oil tank (2) and a first directional valve (1) for connection to an actuator, characterized in that, It also includes a first accumulator (24), a second accumulator (16), a pressure amplifier (11), and a second directional valve (10) for switching the inlet and outlet oil entering the pressure amplifier (11). The oil tank (2) and the first reversing valve (1) are connected by an oil inlet line (3) and an oil return line (20). The oil inlet line (3) is divided into a first branch (301) and a second branch (302) from the oil tank (2). The first branch (301) is connected in sequence to the third normally open solenoid valve (4), the sixth check valve (6), the seventh check valve (8) and the first reversing valve (1). The second branch (302) is connected to the second accumulator (16). A third branch (303) is further divided from the first branch (301). The third branch (303) is connected in sequence to the second reversing valve (10), the pressure amplifier (11) and the first reversing valve (1). The second accumulator (16) is connected to the third branch (303) through the first pipeline (31). The return oil line (20) branches out into a fourth branch (201) and a fifth branch (202) from the oil tank (2). The fourth branch (201) is connected to the second normally open solenoid valve (19) and the second accumulator (16). The fifth branch (202) is connected to the first normally open solenoid valve (28) and the first accumulator (24). The first accumulator (24) is connected to the third normally closed solenoid valve (22) and the first directional valve (1) in sequence through the second pipeline (29). The first accumulator (24) is connected to the first pipeline (31) through the third pipeline (32). The second pipeline (29) is connected to a sixth branch (203). The sixth branch (203) is connected to the second accumulator (16) through the fourth normally open solenoid valve (18). The sixth branch (203) is also connected to the second directional valve (10).

2. The energy storage hydraulic amplifier according to claim 1, characterized in that, It also includes a drive accumulator (14) connected to the first accumulator (24) via a fourth pipeline (33), on which a first normally closed solenoid valve (27) is provided.

3. The energy storage hydraulic amplifier according to claim 2, characterized in that, The first energy storage device (24) is provided with a first limit switch (25), which serves as a signal source for opening the first normally closed solenoid valve (27), closing the first normally open solenoid valve (28), closing the third normally closed solenoid valve (22), and opening the fourth normally open solenoid valve (18). The second energy storage device (16) is provided with a second limit switch (26), which serves as a signal source for opening the second normally closed solenoid valve (15), closing the second normally open solenoid valve (19), closing the fourth normally open solenoid valve (18), and opening the third normally closed solenoid valve (22).

4. The energy storage hydraulic amplifier according to claim 2, characterized in that, The second energy storage device (16) is provided with a second driving cavity (161) and a second energy storage cavity (162). The second branch (302) is connected to the inlet of the second driving cavity (161), the fourth branch (201) is connected to the outlet of the second driving cavity (161), the sixth branch (203) is connected to the inlet of the second energy storage cavity (162), and the first pipeline (31) is connected to the outlet of the second energy storage cavity (162).

5. The energy storage hydraulic amplifier according to claim 2, characterized in that, The first energy storage device (24) is provided with a first drive chamber (241) and a first energy storage chamber (242). The fourth pipeline (33) is connected to the inlet of the first drive chamber (241), and the fifth branch (202) is connected to the outlet of the first drive chamber (241). The third pipeline (32) is connected to the outlet of the first energy storage chamber (242), and the second pipeline (29) is connected to the first reversing valve (1) and the inlet of the first energy storage chamber (242).

6. The energy storage hydraulic amplifier according to claim 1, characterized in that, A second relief valve (13) is connected to the second branch (302).

7. The energy storage hydraulic amplifier according to claim 1, characterized in that, The first branch (301) is connected to a first relief valve (5), which is located between the third normally open solenoid valve (4) and the sixth check valve (6).

8. The energy storage hydraulic amplifier according to claim 1, characterized in that, The first branch (301) is also connected to an oil circuit accumulator (7), and at least two oil circuit accumulators (7) are connected in parallel on the first branch (301).

9. A method for operating an energy storage hydraulic amplifier as described in any one of claims 1-8, characterized in that, include: When the actuator advances rapidly, the hydraulic oil in the oil tank (2) enters the first directional valve (1) through the third normally open solenoid valve (4), the sixth check valve (6) and the seventh check valve (8), and is injected into the actuator from the first directional valve (1); as the actuator advances rapidly, some hydraulic oil flows from the first branch (301) into the third branch (303) and enters the pressure amplifier (11) from the second directional valve (10) for amplification; the amplified hydraulic oil directly enters the actuator; When the actuator is pressurized and reversed for unloading, the hydraulic oil in the actuator flows from the return oil line (20) on the first reversing valve (1) through the fourth normally open solenoid valve (18) into the second accumulator (16) for storage. At this time, the second pipeline (29) leading to the first accumulator (24) is closed. When the amount stored in the second accumulator (16) reaches the set value, the second limit switch (26) serves as the opening signal source for the second normally closed solenoid valve (15) and the second normally open solenoid valve (19). The second normally closed solenoid valve (15) opens, and the second normally open solenoid valve (19) and the fourth normally open solenoid valve (18) close. At the same time, the third normally closed solenoid valve (22) opens, driving the relatively high-pressure hydraulic oil in the accumulator (14) into the second accumulator (16). The hydraulic oil in the second accumulator (16) is discharged from the second accumulator (16) through the first pipeline (31) to the pressure amplifier (11) for amplification. The hydraulic oil in the actuator enters the first accumulator (24) through the return oil line (20) on the first directional valve (1) and the third normally closed solenoid valve (22) for storage; at this time, the sixth branch (203) leading to the second accumulator (16) is closed; when the storage amount in the first accumulator (24) reaches the set value, the first limit switch (25) signal is input to the control system, and the system issues a command to control the first normally closed solenoid valve (27) to open, the first normally open solenoid valve (28) to close, the third normally closed solenoid valve (22) to close, and the fourth normally open solenoid valve (18) to open, and the hydraulic oil in the first accumulator (24) is discharged to the pressure amplifier (11) through the third pipeline (32) for amplification; The energy recovery and reuse are completed through repeated cycles.

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