CN107524187B - Hydraulic and Electric Hybrid Recovery and Utilization System of Rotary Motion Braking Energy - Google Patents

Abstract

A hydraulic-electric hybrid recovery and utilization system for rotary motion braking energy is additionally provided with a two-position two-way electromagnetic reversing valve, a damping hole, a two-position four-way electromagnetic reversing valve, a two-position three-way hydraulic control reversing valve, and a proportional pilot overflow valve. Flow valves, fuel tanks, displacement sensors, hydraulic accumulators, two-variable pistons, hydraulic motors/pumps, DC-DC converters, supercapacitors, power switches, motor speed controllers, and motor/generators, all of which are generated by pressure or torque Volume regulation realizes the controllable regeneration and utilization of stored energy without throttling and short conversion chain, improves the efficiency of energy recovery and regeneration, reduces the complexity of the control system, and improves the usability.

Description

Hydraulic and Electric Hybrid Recovery and Utilization System of Rotary Motion Braking Energy

technical field

The invention relates to a hydraulic-electric hybrid recovery and utilization system for rotary motion braking energy, in particular to a hydraulic-electric hybrid recovery and utilization system for rotary motion (including slewing and walking) braking energy for hydraulic excavators and other equipment.

Background technique

With the rapid development of my country's equipment manufacturing industry, the output of hydraulic excavators, loaders and truck cranes ranks first in the world, becoming one of my country's important pillar industries. In these equipment operations, the kinetic energy of turning and walking on the vehicle is very large, and the acceleration and deceleration are very frequent. If the braking kinetic energy is not effectively regenerated, it will cause a very large energy loss. Therefore, how to efficiently recover and utilize this part of energy and seek an efficient and energy-saving hydraulic slewing system plays an important role in improving the overall energy efficiency of engineering equipment.

At present, the methods for recovering and reusing the braking energy of rotary motion mainly include: using accumulator to directly recover braking kinetic energy, adopting secondary regulation technology, adopting closed loop method and hybrid method. For example, in the patent document (CN105008729 A), an energy regeneration system for construction machinery is proposed, which adopts a hybrid method to recover the braking energy through a regeneration device composed of a hydraulic motor, an electric motor and a battery (or a super capacitor bank). To overcome the torque shock caused by the initial large inertia load of braking, a throttle valve is set before the energy recovery hydraulic motor for regulation, although the stability of the braking process is improved, but the throttling loss is increased, and this method needs to go through many times. Conversion can be used for energy regeneration, and the efficiency is low.

Analyzing the existing recycling methods, for the kinetic energy recycling of the rotary motion mechanism, electrical methods, hydraulic accumulator methods and their composite methods are used. To achieve good operating characteristics, the method of throttling first and then recovery needs to be adopted, which reduces the energy utilization efficiency and generates a large secondary throttling loss during regeneration.

SUMMARY OF THE INVENTION

Aiming at the above-mentioned deficiencies of the existing engineering equipment in the process of turning and walking, the present invention provides a hydro-electric hybrid recovery and utilization system for rotary motion braking energy. The controllable regeneration of the conversion chain improves the efficiency of energy recovery and regeneration, reduces the complexity of the control system, and improves the controllability.

In order to achieve the above objects, the technical solutions adopted by the present invention are as follows.

A hydraulic-electric hybrid recovery and utilization system for rotary motion braking energy, comprising a hydraulic motor, a power source, a main control circuit, and a one-way valve group, characterized in that:

The I and II two-position two-way electromagnetic reversing valves, the I-III orifices whose serial numbers are I to III, the two-position four-way electromagnetic reversing valve, the two-position three-way hydraulic control reversing valve, Proportional pilot relief valve, fuel tank, displacement sensor, hydraulic accumulator, first and second variable piston, hydraulic motor/pump, DC-DC converter, super capacitor, power switch, motor speed controller, motor/generator ; The input end of the motor/generator is connected to the output end of the motor speed controller, and the output end of the motor/generator is connected to drive the hydraulic motor/pump; the DC-DC converter is connected in parallel with the super capacitor into the motor speed controller;

The oil port F of the hydraulic motor/pump is connected to the hydraulic accumulator, and the hydraulic motor/pump oil port E with continuously adjustable electric proportional pressure is respectively connected with the left control chamber of the two-position three-way hydraulic control reversing valve. , The oil port G of the two-position four-way electromagnetic reversing valve is communicated with the oil inlet of the first orifice; the oil outlet of the first orifice is respectively connected to the right control The cavity is communicated with the oil inlet of the proportional pilot relief valve; the oil ports H, J, and K of the two-position four-way electromagnetic reversing valve are respectively connected with the oil tank, the oil ports M and the oil ports of the two-position three-way hydraulic control reversing valve. P is connected; the oil port N of the two-position three-way hydraulic control reversing valve is communicated with the rodless cavity of the first variable piston through the second damping hole, and is connected with the oil tank through the third orifice at the same time; the displacement sensor is connected to the second variable piston. Piston rod connection;

The oil port A of the first two-position electromagnetic reversing valve and the oil port C of the second two-position two-way electromagnetic reversing valve are respectively connected with the oil ports Q and P of the hydraulic motor, and the first two The oil port B of the two-position electromagnetic reversing valve is respectively connected with the oil port E of the hydraulic motor/pump and the oil port G of the two-position four-way electromagnetic reversing valve. The oil port D of the direction valve is respectively communicated with the oil port E of the hydraulic motor/pump and the left control chamber of the two-position three-way hydraulic control reversing valve;

Further, the rotary motion braking energy-hydro-electric hybrid recycling system is characterized in that: the main control loop can be a negative flow control loop, a positive flow control loop, an independent inlet and outlet control loop or a closed pump control loop, etc. ; The main control circuit controls the running direction and speed of the hydraulic motor according to the operation command.

Further, the rotary motion braking energy hydro-electric hybrid recycling system is characterized in that: the rotary motion braking energy hydro-electric hybrid recycling system has two working modes of energy storage and regeneration, when the two-position four-way electromagnetic When the reversing valve is in the left position, it works in the energy storage mode. Due to the large running speed, the braking process requires the kinetic energy to be stored in the hydraulic accumulator and the super capacitor within a short period of time. The synergistic motor/generator quickly establishes the braking torque, and can adjust the braking torque according to the braking angle requirements to realize controllable braking. When the two-position four-way electromagnetic reversing valve is in the right position, it works in the regeneration mode, and can press the pressure matching mode (the pump speed remains unchanged, and the outlet pressure is controlled) and the flow matching mode (the pressure value is set to a higher value, and the pump speed is changed to control the flow rate). ) Control the regeneration flow; realize the recovery of no throttling loss and utilize the braking kinetic energy of the rotating mechanism.

Compared with the prior art, the above technical solution of the present invention has the following advantages and positive effects.

The system recovers and utilizes the kinetic energy of the hydraulic rotating mechanism without throttling loss, and has high recovery and regeneration efficiency.

This system integrates energy storage and reuse, hydraulic and electrical dual-source energy storage, and direct use of recovered energy can reduce the installed power of the main engine, reduce system heat, increase the sustainable working time of the machine and reduce cooling power, and alleviate the small hydraulic oil tank of engineering equipment. , The problem of long-term high temperature work of hydraulic oil is easy to age.

The energy recovery and utilization unit of the system can be used as an active volumetric pressure control device to replace the current energy-consuming components to control the pressure of the hydraulic system.

The energy recovery and utilization unit of this system can be attached to various existing hosts as an independent control unit, without affecting the controllability of the existing machine, and has strong versatility.

Description of drawings

FIG. 1 is a schematic structural diagram of a system according to Embodiment 1 of the present invention.

FIG. 2 is a schematic structural diagram of a system according to Embodiment 2 of the present invention.

FIG. 3 is a schematic structural diagram of a system according to Embodiment 3 of the present invention.

FIG. 4 is a schematic structural diagram of a system according to Embodiment 4 of the present invention.

In the figure: 1: Hydraulic motor; 2: The first two-position two-way electromagnetic reversing valve; 3: The second two-position two-way electromagnetic reversing valve; 4a: The first damping hole; 4b: The second damping hole; 4c: The third orifice; 5: 2/2 four-way electromagnetic reversing valve; 6: 2/2 three-way hydraulic control reversing valve; 7: proportional pilot relief valve; 8: fuel tank; 9: displacement sensor; 10: hydraulic energy storage 11a: first variable piston; 11b: second variable piston; 12: hydraulic motor/pump; 13: DC-DC converter; 14: super capacitor; 15: power switch; 16: power source; 17: main control circuit; 18a~18b: one-way valve group; 19: motor speed controller; 20: motor/generator.

Detailed ways

The specific embodiments of the present invention will be further described below with reference to the accompanying drawings.

Example 1

The specific embodiment 1 of the present invention will be further described below with reference to FIG. 1 .

As shown in FIG. 1 , a hydraulic-electric hybrid recovery and utilization system for rotary motion braking energy. In the specific implementation, the power source 16 adopts a diesel engine, the hydraulic motor 1 adopts a quantitative motor, and the pressure continuously adjustable hydraulic motor/pump 12 adopts an axial Plunger structure principle, hydraulic accumulator 10 is piston type, motor/generator 20 is permanent magnet synchronous structure, motor speed controller 19 adopts vector control mode, super capacitor 14 is composed of basic modules in series and parallel combination, DC-DC The converter 13 can boost and buck in both directions, the external power supply adopts a battery pack, the diameter of the first orifice 4a is 0.9 mm, the motor/pump mode switching valve adopts an electronic control method, and the two-position three-way hydraulic control reversing valve 6 is Hydraulically controlled three-way spool valve, the diameter of the second orifice 4b is 1 mm, the proportional pilot relief valve 7 adopts a cone valve structure, the diameter of the rodless cavity of the variable hydraulic cylinder is 40 mm, and the hydraulic motor/pump 12 adopts an axial plunger Structural form, the diameter of the third orifice 4c is 0.8 mm, the straight diameter of the rod cavity of the variable hydraulic cylinder is 30 mm, the volume of the oil tank 8 is 200 L, and the displacement sensor 9 adopts a differential transformer structure.

The structural system relationship for implementing the technical solution is that the input end of the motor/generator 20 is connected to the output end of the motor speed controller 19, and the output end of the motor/generator 20 is connected to the driving hydraulic motor/pump 12; The super capacitor 14 is connected to the motor speed controller 19 in parallel.

The oil port F of the hydraulic motor/pump 12 is connected to the hydraulic accumulator 10, and the oil port E of the hydraulic motor/pump 12 whose electric proportional pressure is continuously adjustable is connected to the left control chamber of the two-position three-way hydraulic control reversing valve 6 respectively. , The oil port G of the two-position four-way electromagnetic reversing valve 5 is communicated with the oil inlet port of the first orifice 4a; the oil outlet of the first orifice 4a is The control chamber is connected with the oil inlet of the proportional pilot relief valve 7; the oil ports H, J and K of the two-position four-way electromagnetic reversing valve 5 are respectively connected with the oil tank 8 and the oil of the two-position three-way hydraulic control reversing valve 6 The port M and P are connected; the oil port N of the two-position three-way hydraulic control reversing valve 6 is connected with the rodless cavity of the first variable piston through the second damping hole 4b; at the same time, it is connected with the oil tank 8 through the third orifice 4c The displacement sensor 9 is communicated with the piston rod of the second variable piston.

Among them, the oil port A of the first two-position two-way electromagnetic directional valve 2 and the oil port C of the second two-position two-way electromagnetic directional valve 3 are respectively connected with the oil ports Q and P of the hydraulic motor 1; The oil port B of the two-position electromagnetic reversing valve 2 is connected with the oil port E of the hydraulic motor/pump 12 and the oil port G of the two-position four-way electromagnetic reversing valve 5; the second two-position two-way electromagnetic reversing valve The oil port D of 3 is connected with the oil port E of the hydraulic motor/pump 12 and the left control chamber of the two-position three-way hydraulic control reversing valve 6, respectively.

A further embodiment is that: the main control loop of the rotary motion braking energy-hydraulic-electric hybrid recovery and utilization system is a negative flow control loop, and the main control loop controls the running direction and speed of the hydraulic motor according to the operation command.

A further embodiment is that: the rotary motion braking energy hydraulic-electric hybrid recycling system has two working modes: energy storage and regeneration. When the two-position four-way electromagnetic directional valve 5 is in the left position, it works in the energy storage mode. The running speed is large, and the braking process requires the kinetic energy to be stored in the hydraulic accumulator 10 and the super capacitor 14 within a short period of time. The hydraulic motor/pump 12 is used to quickly establish the braking torque in cooperation with the motor/generator 20, which can be Braking angle requirements, adjust the braking torque to achieve controllable braking; when the two-position four-way electromagnetic reversing valve 5 is in the right position, it works in the regeneration mode, and presses the pressure matching mode: if the pump speed remains unchanged, the outlet pressure is controlled ; Flow matching mode: If the set pressure value is high, change the pump speed to control the flow, control the regeneration flow, and realize the recovery of no throttling loss and the use of the braking kinetic energy of the rotating mechanism.

Example 2

The specific embodiment 2 of the present invention will be further described below with reference to FIG. 2 .

As shown in FIG. 2 , the connection and working methods of the components in this embodiment are the same as those in Embodiment 1, and the difference is that the main control loop is a positive flow control loop. The hydraulic pump is a variable displacement pump controlled by electronic proportionality, and its displacement is proportional to the set signal, that is, when the set signal increases, the displacement of the hydraulic pump also increases.

Example 3

The specific embodiment 3 of the present invention will be further described below with reference to FIG. 3 .

As shown in FIG. 3 , the connection and working modes of the components in this embodiment are the same as those in Embodiment 1, and the difference is that the main control loop is an independent control loop for the inlet and outlet. The main control valve is composed of two three-position three-way proportional directional valves. The working oil port of the first proportional directional valve is connected with the oil port P of the hydraulic motor 1, and the working oil port of the second proportional directional valve is connected with the oil of the hydraulic motor 1. Port Q is connected, and the oil outlet of the hydraulic pump is connected with the oil inlet of the first and second proportional directional valves.

Example 4

The specific embodiment 4 of the present invention will be further described below with reference to FIG. 4 .

As shown in FIG. 4 , the connection and working methods of the components in this embodiment are the same as those in Embodiment 1, and the difference is that the main control circuit is a closed pump control circuit. The hydraulic pump is a bidirectional variable hydraulic pump, and the two oil ports of the hydraulic pump are respectively connected with the oil ports P and Q of the hydraulic motor.

Claims (3)

1. A hydraulic-electric hybrid recycling system for braking energy of rotary motion comprises a hydraulic motor (1), a power source (16), a main control loop (17) and a check valve bank (18); the method is characterized in that:

the hydraulic control system is additionally provided with an I two-position two-way electromagnetic directional valve (2), an II two-position two-way electromagnetic directional valve (3), an I damping hole (4 a), an II damping hole (4 b), an III damping hole (4 c), a two four-way electromagnetic directional valve (5), a two three-position three-way hydraulic control directional valve (6), a proportional pilot overflow valve (7), an oil tank (8), a displacement sensor (9), a hydraulic energy accumulator (10), a first variable piston (11 a), a second variable piston (11 b), a hydraulic motor/pump (12), a DC-DC converter (13), a super capacitor (14), a power switch (15), a motor rotating speed controller (19) and a motor/generator (20);

the input end of the motor/generator (20) is connected with the output end of the motor rotating speed controller (19), and the output end of the motor/generator is connected with the hydraulic motor/pump (12);

the DC-DC converter (13) and the super capacitor (14) are connected into the motor rotating speed controller (19) in parallel;

an oil port F of the hydraulic motor/pump (12) is communicated with the hydraulic energy accumulator (10), and an oil port E is respectively communicated with a left control cavity of the two-position three-way hydraulic control reversing valve (6), an oil port G of the two-position four-way electromagnetic reversing valve (5) and an oil inlet of the damping hole I (4 a);

an oil outlet of the first damping hole (4 a) is communicated with a right control cavity of the two-position three-way hydraulic control reversing valve (6) and an oil inlet of the proportional pilot overflow valve (7) respectively;

an oil port H, an oil port J and an oil port K of the two-position four-way electromagnetic reversing valve (5) are respectively communicated with an oil tank (8), an oil port M of the two-position three-way hydraulic control reversing valve and an oil port P of the two-position three-way hydraulic control reversing valve;

an oil port N of the two-position three-way hydraulic control reversing valve (6) is communicated with a rodless cavity of the first variable piston (11 a) through a second damping hole (4 b) and is communicated with an oil tank (8) through a third damping hole (4 c); the displacement sensor (9) is connected with a piston rod of the second variable piston (11 b);

the hydraulic control system is characterized in that an oil port A of the first two-position two-way electromagnetic directional valve (2) and an oil port C of the second two-position two-way electromagnetic directional valve (3) are respectively communicated with an oil port Q of the hydraulic motor (1) and an oil port P of the hydraulic motor (1), an oil port B of the first two-position two-way electromagnetic directional valve (2) is respectively communicated with an oil port E of the hydraulic motor/pump (12) and an oil port G of the two-position four-way electromagnetic directional valve (5), and an oil port D of the second two-position two-way electromagnetic directional valve (3) is respectively communicated with an oil port E of the hydraulic motor/pump (12) and a left control cavity of the two-position three-way hydraulic control directional valve (6).

2. The rotary motion braking energy hydro-electric hybrid recovery and utilization system of claim 1, wherein: the main control loop is a negative flow control loop, a positive flow control loop, an inlet and outlet independent control loop or a closed pump control loop, and the main control loop controls the running direction and the speed of the hydraulic motor (1) according to an operation instruction.

3. The rotary motion braking energy hydro-electric hybrid recovery and utilization system of claim 1, wherein: the recycling system has two working modes of energy storage and regeneration, and when the two-position four-way electromagnetic directional valve (5) is in the left position, the recycling system is in the energy storage mode; when the two-position four-way electromagnetic directional valve (5) is in the right position, the regeneration mode is adopted, the regeneration flow is controlled by the pressing force matching mode and the flow matching mode, and the throttling loss-free recovery and the utilization of the braking kinetic energy of the rotating mechanism are realized.

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