CN107524187A - Rotary motion braking energy liquid electricity mixing recycling system - Google Patents

Abstract

A hydraulic-electric hybrid recovery and utilization system for braking energy of rotary motion, additionally equipped with a two-position two-way electromagnetic directional valve, a damping hole, a two-position four-way electromagnetic directional valve, a two-position three-way hydraulic control directional valve, a proportional pilot overflow Flow valves, oil tanks, displacement sensors, hydraulic accumulators, two variable pistons, hydraulic motors/pumps, DC-DC converters, supercapacitors, power switches, motor speed controllers and motors/generators, and through pressure or torque The volume regulation realizes the unthrottled and short conversion chain controllable regeneration of stored energy, improves the efficiency of energy recovery and regeneration, reduces the complexity of the control system, and improves usability.

Description

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

technical field

The invention relates to a hydraulic-electric hybrid recycling system for braking energy of rotary motion, in particular to a hydraulic-electric hybrid recycling system for braking energy of rotary motion (including turning and walking) of equipment such as hydraulic excavators.

Background technique

With the rapid development of my country's equipment manufacturing industry, the output of hydraulic excavators, loaders and truck cranes has leapt to the first place 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, a very large energy loss will occur. Therefore, how to efficiently recycle 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 rotating motion mainly include: using accumulators to directly recover braking kinetic energy, adopting secondary regulation technology, adopting closed loop method and hybrid power method. For example, in the patent document (CN105008729 A), an energy regeneration system for construction machinery is proposed, which uses a hybrid method to recycle the braking energy through a regeneration device composed of a hydraulic motor, an electric motor, and a battery (or a supercapacitor bank). To overcome the torque impact caused by the initial large inertial 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, the throttling loss is increased, and this method needs to go through many times Conversion can be used to regenerate energy, and the efficiency is low.

Analyze the existing recovery and reuse methods. For the recovery and utilization of kinetic energy of the rotary motion mechanism, electric methods, hydraulic accumulator methods and their composite methods are adopted. In order to improve the controllability of the system and balance the large torque demand in the early stage of kinetic energy recovery, the obtained For good operating characteristics, it is necessary to adopt the method of throttling first and then recycling, which reduces the energy utilization efficiency and will cause a large secondary throttling loss during regeneration.

Contents of the invention

Aiming at the deficiencies in the above-mentioned existing engineering equipment in the process of slewing and walking, the present invention provides a hydraulic-electric hybrid recovery and utilization system for braking energy of rotating motion, which realizes unthrottled, short-term 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 object, the technical solutions adopted by the present invention are as follows.

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

The first and second two-position two-way electromagnetic reversing valves, the first-third damping holes with serial numbers from I to III, the two-position four-way electromagnetic reversing valve, the two-position three-way hydraulic control reversing valve, Proportional pilot relief valve, oil tank, displacement sensor, hydraulic accumulator, first and second variable displacement piston, hydraulic motor/pump, DC-DC converter, super capacitor, power switch, motor speed controller, motor/generator The motor/generator input terminal is connected to the motor speed controller output terminal, and the motor/generator output terminal is connected to drive the hydraulic motor/pump; the DC-DC converter is connected in parallel with the supercapacitor Enter the motor speed controller;

The oil port F of the hydraulic motor/pump is connected to the hydraulic accumulator, and the oil port E of the hydraulic motor/pump with continuously adjustable electric proportional pressure is respectively connected to 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 communicates with the oil inlet port of the first damping hole; The cavity is connected with the oil inlet port 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 port M and the oil port of the two-position three-way hydraulic control reversing valve P connection; the oil port N of the two-position three-way hydraulic control reversing valve communicates with the rodless chamber of the first variable piston through the second damping hole, and communicates with the oil tank through the third damping hole at the same time; the displacement sensor communicates with the second variable piston Piston rod connection;

The oil port A of the first two two-way electromagnetic reversing valve and the oil port C of the second two 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 two-way 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, and the second two-position two-way electromagnetic reversing valve The oil port D of the directional valve communicates 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 respectively;

Furthermore, the hydraulic-electric hybrid recovery and utilization system for rotational motion braking energy is characterized in that: the main control loop can be a negative flow control loop, a positive flow control loop, an independent control loop for inlet and outlet, or a closed pump control loop, etc. ; The main control loop controls the running direction and speed of the hydraulic motor according to the operation instruction.

Further, the hydraulic-electric hybrid recycling system for braking energy of rotary motion is characterized in that: the hybrid electric-hydraulic recycling system for braking energy of rotary motion has two working modes: energy storage and regeneration. When the reversing valve is in the left position, it works in the energy storage mode. Due to the high operating speed, the braking process requires kinetic energy to be stored in the hydraulic accumulator and the super capacitor in a short period of time. A hydraulic motor/pump is used. Cooperating with the electric motor/generator quickly establishes the braking torque, which can be adjusted according to the braking angle requirements to achieve controllable braking. When the two-position four-way electromagnetic reversing valve is in the right position, it works in the regenerative mode, and can be controlled according to 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 higher, and the pump speed is changed to control the flow rate) ) to control the regeneration flow rate; to achieve no throttling loss recovery and to utilize the braking kinetic energy of the rotating mechanism.

Compared with the prior art, the 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.

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

The energy recovery and utilization unit of this 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 host machines as an independent control unit, without affecting the controllability of the existing machines, and has strong versatility.

Description of drawings

FIG. 1 is a schematic structure diagram of the system in Embodiment 1 of the present invention.

Fig. 2 is a schematic structure diagram of the system of Embodiment 2 of the present invention.

Fig. 3 is a schematic structure diagram of the system according to Embodiment 3 of the present invention.

Fig. 4 is a schematic structure diagram of the system according to Embodiment 4 of the present invention.

In the figure: 1: hydraulic motor; 2: the first two-position two-way electromagnetic directional valve; 3: the second two-position two-way electromagnetic directional valve; 4a: the first damping hole; 4b: the second two-way damping hole; 4c: Damping hole III; 5: Two-position four-way electromagnetic directional valve; 6: Two-position three-way hydraulic control directional 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 description

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

Example 1

The specific embodiment 1 of the present invention will be further described below in conjunction with the accompanying drawing 1 .

As shown in Figure 1, a hydraulic-electric hybrid recovery and utilization system for rotational 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 The principle of plunger structure, 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 connected in series and parallel, DC-DC The converter 13 can boost and lower the voltage bidirectionally. The external power source is a battery pack. The diameter of the first damping hole 4a is 0.9 mm. The motor/pump mode switching valve is electronically controlled. Hydraulically controlled three-way slide valve, the diameter of the second damping hole 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 In terms of structure, the diameter of the third damping hole 4c is 0.8 mm, the diameter of the rod chamber 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 relation of implementing technical solution is, the input end of motor/generator 20 is connected the output end of motor speed controller 19, and the output end of motor/generator 20 is connected to drive hydraulic motor/pump 12; DC-DC converter 13 and The supercapacitor 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 with continuously adjustable electric proportional pressure is respectively connected to the left control chamber of the two-position three-way hydraulic control reversing valve 6. , The oil port G of the two-position four-way electromagnetic reversing valve 5 is connected with the oil inlet of the first damping hole 4a; the oil outlet of the first I damping hole 4a is respectively connected with the right The control chamber is connected with the oil inlet port of the proportional pilot relief valve 7; the oil ports H, J, and K of the two-position four-way electromagnetic directional control valve 5 are respectively connected with the oil of the oil tank 8 and the two-position three-way hydraulic control directional control valve 6. 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 chamber 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 damping hole 4c Pass; The displacement sensor 9 communicates with the piston rod of the second variable piston.

Among them, the oil port A of the first two two-way electromagnetic reversing valve 2 and the oil port C of the second two two-way electromagnetic reversing 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 two-way electromagnetic reversing valve 2 is respectively 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 communicates 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: the main control loop of the hydraulic-electric hybrid recovery and utilization system for rotational motion braking energy is a negative flow control loop, and the main control loop is to control the running direction and speed of the hydraulic motor according to the operation instruction.

A further embodiment lies in that the rotary motion braking energy hydraulic-electric hybrid recovery and utilization system has two working modes of energy storage and regeneration. When the two-position four-way electromagnetic reversing valve 5 is in the left position, it works in the energy storage mode. The running speed is relatively high, and the braking process requires kinetic energy to be stored in the hydraulic accumulator 10 and the super capacitor 14 in a short period of time. The hydraulic motor/pump 12 is used to cooperate with the electric motor/generator 20 to quickly establish the braking torque. Braking angle requirements, adjust the braking torque, and realize controllable braking; when the two-position four-way electromagnetic reversing valve 5 is in the right position, it works in the regenerative mode and presses the pressure matching mode: if the pump speed does not change, control the outlet pressure ;Flow matching mode: If the set pressure value is high, change the pump speed to control the flow, control the regeneration flow, realize no throttling loss recovery and use the braking kinetic energy of the rotating mechanism.

Example 2

The specific embodiment 2 of the present invention will be further described below in conjunction with the accompanying drawing 2 .

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

Example 3

The specific embodiment 3 of the present invention will be further described below in conjunction with the accompanying drawing 3 .

As shown in Figure 3, the connection and working methods of the components in this embodiment are the same as those in Embodiment 1, the difference being that the main control loop is an independent control loop for the import and export. 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 port of the hydraulic motor 1. Port Q is connected, and the oil outlet of the hydraulic pump is connected with the oil inlets of the first and second proportional directional valves.

Example 4

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

As shown in Figure 4, the connection and working methods of the components in this embodiment are the same as those in Embodiment 1, the difference being that the main control loop is a closed pump control loop. The hydraulic pump is a two-way 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 kind of rotary motion braking energy liquid electricity mixing recycling system, includes hydraulic motor（1）, power source（16）、 Main control loop（17）And unidirectional valve group（18）；It is characterized in that：

Have additional the Ith 2/2-way solenoid directional control valve（2）, the IIth 2/2-way solenoid directional control valve（3）, the Ith damping hole（4a）, II damping hole（4b）, the IIIth damping hole（4 c）, two four-way electromagnetic reversing valves（5）, two-bit triplet pilot operated directional control valve（6）, ratio Precursor overflow valve（7）, fuel tank（8）, displacement transducer（9）, hydraulic accumulator（10）, the first variable piston（11a）, the second variable Piston（11b）, hydraulic motor/pump（12）, dc-dc（13）, super capacitor（14）, power switch（15）, motor speed Controller（19）, dynamoelectric machine（20）；

The dynamoelectric machine（20）Input be connected with the motor speed controller（19）Output end, output end connect It is connected to the driving hydraulic motor/pump（12）；

The dc-dc（13）With the super capacitor（14）Parallel connection accesses the motor speed controller（19）；

The hydraulic motor/pump（12）Hydraulic fluid port F be communicated with the hydraulic accumulator（10）, hydraulic fluid port E respectively with described two three Logical pilot operated directional control valve（6）Left control chamber, two four-way electromagnetic reversing valves（5）Hydraulic fluid port G and the Ith damping hole（4a）Oil-feed Mouth connection；

Ith damping hole（4a）Oil-out respectively with the two-bit triplet pilot operated directional control valve（6）Right control chamber and described Proportion pilot overflow valve（7）Oil inlet connects；

Two four-way electromagnetic reversing valves（5）Hydraulic fluid port H, hydraulic fluid port J, hydraulic fluid port K respectively with fuel tank（8）, the two-bit triplet liquid The hydraulic fluid port M of control reversal valve connects with the hydraulic fluid port P of two-bit triplet pilot operated directional control valve；

The two-bit triplet pilot operated directional control valve（6）Hydraulic fluid port N pass through the IIth damping hole（4b）With the first variable piston（11a）Nothing Rod cavity connects, while passes through the IIIth damping hole（4c）With fuel tank（8）Connection；Displacement transducer（9）With the second variable piston（11b） Piston rod connection；

The Ith 2/2-way solenoid directional control valve（2）Hydraulic fluid port A and the IIth 2/2-way solenoid directional control valve（3）Hydraulic fluid port C difference With the hydraulic motor（1）Hydraulic fluid port Q and the hydraulic motor（1）Hydraulic fluid port P connection, the Ith 2/2-way electromagnetic switch Valve（2）Hydraulic fluid port B respectively with the hydraulic motor/pump（12）Hydraulic fluid port E and two four-way electromagnetic reversing valves（5）Hydraulic fluid port G is connected, the IIth 2/2-way solenoid directional control valve（3）Hydraulic fluid port D respectively with the hydraulic motor/pump（12）Hydraulic fluid port E and The two-bit triplet pilot operated directional control valve（6）Left control chamber connection.

2. rotary motion braking energy liquid electricity mixing recycling system according to claim 1, it is characterised in that：It is described Main control loop is inverted flux control loop, positive flow control loop, inlet and outlet individual control loop either closed model pump control time Road, and the main control loop is to control the hydraulic motor according to operational order（1）Traffic direction and speed.

3. rotary motion braking energy liquid electricity mixing recycling system according to claim 1, it is characterised in that：It is described Recycling system is with two kinds of mode of operations of energy storage and regeneration, when two four-way electromagnetic reversing valves（5）It is during in left position Energy storage pattern；When two four-way electromagnetic reversing valves（5）It is regeneration mode, pressing force match pattern and flow matches during in right position Schema control regenerant flow, realize no restriction loss recovery and the braking kinetic energy using rotating mechanism.