阅读说明：本技术 一种能量回收利用装置 (Energy recycling device ) 是由 何清华 唐中勇 刘昌盛 吴民旺 戴鹏 李赛白 于 2019-11-14 设计创作，主要内容包括：本发明公开了一种能量回收利用装置,包括三位七通换向阀、双油源耦合器和蓄能器；所述三位七通换向阀包括中位、能量释放位和能量回收位,其上设有进油口、回油口、两组工作油口以及三组节能油口,所述进油口、回油口以及两组工作油口分别对接驱动油缸的两个油口以及液压系统的进出油路,其中一组节能油口连接至蓄能器,另外两组节能油口汇接至双油源耦合器,所述双油源耦合器并联连接至驱动油缸的其中一个油口,本发明通过三位七通换向阀改变外部有势装置的驱动油缸进出油路,通过驱动油缸的两个油腔差动互通的再生能量回收方式,高效回收了外部有势装置的势能,并且保证了装置工作的可靠性。(The invention discloses an energy recycling device, which comprises a three-position seven-way reversing valve, a double-oil-source coupler and an energy accumulator, wherein the three-position seven-way reversing valve is connected with the energy accumulator; the three-position seven-way reversing valve comprises a middle position, an energy release position and an energy recovery position, wherein an oil inlet, an oil return port, two groups of working oil ports and three groups of energy-saving oil ports are arranged on the three-position seven-way reversing valve, the oil inlet, the oil return port and the two groups of working oil ports are respectively butted with two oil ports of a driving oil cylinder and an oil inlet and outlet way of a hydraulic system, one group of energy-saving oil ports are connected to an energy accumulator, the other two groups of energy-saving oil ports are converged to a double-oil-source coupler, and the double-oil-source coupler is connected to one oil port of the driving oil cylinder in parallel.)

1. Energy recuperation utilizes device, its characterized in that: comprises a three-position seven-way reversing valve (7), a double-oil-source coupler (8) and an energy accumulator (6);

the three-position seven-way reversing valve (7) comprises a middle position, an energy release position and an energy recovery position, wherein an oil inlet, an oil return port, two groups of working oil ports and three groups of energy-saving oil ports are formed in the three-position seven-way reversing valve, the oil inlet, the oil return port and the two groups of working oil ports are respectively butted with two oil ports of a driving oil cylinder and an oil inlet and outlet way of a hydraulic system, one group of energy-saving oil ports are connected to an energy accumulator (6), the other two groups of energy-saving oil ports are converged to a double-oil-source coupler (8), and the double-oil-;

the three-position seven-way reversing valve (7) is located at a middle position, two oil ports of the driving oil cylinder and an oil inlet and outlet path of the hydraulic system are communicated through an oil inlet, an oil return port and two groups of working oil ports of the three-position seven-way reversing valve (7) to form a loop, and three groups of energy-saving oil ports are respectively cut off;

the three-position seven-way reversing valve (7) is located at an energy recovery position, two oil ports of the driving oil cylinder are in differential communication through two groups of working oil ports of the three-position seven-way reversing valve (7), the two groups of working oil ports are also respectively communicated with an energy-saving oil port connected with the energy accumulator (6) and an oil inlet connected to an oil inlet path of a hydraulic system, and the oil return port and two groups of energy-saving oil ports connected to the double-oil-source coupler (8) are respectively cut off;

the three-position seven-way reversing valve (7) is located at an energy release position, one oil port of the driving oil cylinder is communicated with an oil return path of the hydraulic system through one group of working oil ports and the oil inlet, the other group of working oil ports is closed, the oil return port is communicated with one group of energy-saving oil ports connected to the double-oil-source coupler (8), and the other oil port of the driving oil cylinder is respectively connected to an oil inlet path of the hydraulic system and the energy accumulator (6) through the double-oil-source coupler (8).

2. The energy recovery and utilization device of claim 1, wherein a one-way valve is arranged in an energy recovery position of the three-position seven-way reversing valve (7) to realize one-way differential communication of working oil ports connecting two oil ports of the driving oil cylinder.

3. The energy recycling device of claim 2, wherein the double oil source coupler (8) is a double-cylinder coupler and comprises a first cylinder (81) and a second cylinder (82) which are arranged in parallel, the first cylinder (81) and a piston (83) inside the second cylinder (82) are synchronously connected, oil chambers inside the first cylinder (81) and the second cylinder (82) are respectively connected to two groups of energy-saving oil ports of the three-position seven-way reversing valve (7) to serve as oil inlet ends of the double oil source coupler, the other oil chamber of the first cylinder (81) or the second cylinder (82) is connected in parallel to one of the oil ports of the driving oil cylinder through an output end, and the oil chamber is connected with an oil tank through a one-way oil inlet circuit.

4. The energy recovery device according to claim 3, wherein a return spring (85) for returning the piston (83) is arranged in the double-cylinder coupler.

5. The energy recycling device according to claim 2, wherein the double oil source coupler (8) is a double-motor coupler, and comprises two sets of coupling motors arranged in parallel, the input ends of the two sets of coupling motors are respectively connected to two sets of energy-saving oil ports of the three-position seven-way reversing valve (7), and the output ends of the two sets of coupling motors are connected in parallel and are connected in parallel to one of the oil ports of the driving oil cylinder after being converged in parallel.

6. The energy recovery and utilization device of claim 3 or 5, wherein a check valve (9) is arranged on a parallel oil circuit of the double-oil-source coupler (8) and the driving oil cylinder.

Technical Field

The invention belongs to the technology of energy recovery of a hydraulic system, and particularly relates to an energy recovery and utilization device of the hydraulic system for driving an external potential device.

Background

Under the large background of global environmental pollution and energy shortage, governments, industries and markets put higher requirements on energy consumption and emission of large-scale mechanical equipment, and the energy-saving and emission-reducing technology becomes a research hotspot in the field of engineering mechanical equipment. The excavator is a common engineering machine, the movable arm of the excavator usually utilizes hydraulic oil to act on an oil cylinder to realize the lifting of the movable arm, and the movable arm, a bucket rod, a bucket and the like acting on the movable arm are large in mass and are used as main external potential devices (the potential devices refer to potential energy changes generated in the working process) on the excavator, in order to prevent the movable arm devices from easily losing weight in the descending process, a conventional solution is that a throttling device is arranged on a return pipeline of a large cavity of the oil cylinder to generate adjustable back pressure for speed control, so most of energy of the movable arm devices is converted into heat energy, the heat energy is wasted in vain, and in order to prevent damage to a system caused by the large temperature rise of the hydraulic oil, a heat dissipation device is required to be arranged, and the equipment cost is further increased.

In order to improve the energy utilization rate of an excavator and fully utilize the mature reliability of an excavator platform, most manufacturers develop energy recycling devices based on an original excavator platform, but how to realize efficient energy recycling and miniaturize the volume of an energy accumulator element is a difficulty for engineering implementation of energy recycling technology, a common method of the existing energy recycling technology is shown in figures 1a and 1b, a hydraulic main pump 4 and a recycling pump 5 are connected in series to be used as a secondary element for pressurization recycling and reutilization, when hydraulic oil flows back, the hydraulic main pump is used as a driving part to drive the recycling pump to pump hydraulic oil into an energy accumulator 6 for storage so as to realize energy recycling, when the hydraulic oil needs to be pumped to drive a movable arm to lift, the pressure oil in the energy accumulator 6 is converged with the pressure oil pumped by the hydraulic main pump 4 so as to realize the recycling of energy, since the energy conversion efficiency of a single element is generally not more than 85%, after the hydraulic main pump 4 and the recovery pump 5 are arranged in series, the maximum efficiency of one-time recovery is multiplied by only 52%, so that the energy-saving effect is not ideal, and the energy waste is still serious.

Disclosure of Invention

The technical problem solved by the invention is as follows: aiming at the problem of low energy recovery and utilization efficiency of an external potential device in the existing engineering equipment, the energy recovery and utilization device capable of further improving the energy recovery efficiency is provided.

The invention is realized by adopting the following technical scheme:

the energy recycling device comprises a three-position seven-way reversing valve 7, a double-oil-source coupler 8 and an energy accumulator 6;

the three-position seven-way reversing valve 7 comprises a middle position, an energy release position and an energy recovery position, wherein an oil inlet, an oil return port, two groups of working oil ports and three groups of energy-saving oil ports are arranged on the three-position seven-way reversing valve, the oil inlet, the oil return port and the two groups of working oil ports are respectively butted with two oil ports of a driving oil cylinder and an oil inlet and outlet way of a hydraulic system, one group of energy-saving oil ports are connected to the energy accumulator 6, the other two groups of energy-saving oil ports are converged to the double-oil-source coupler 8, and the double-;

the three-position seven-way reversing valve 7 is positioned in the middle position, two oil ports of the driving oil cylinder and an oil inlet and outlet path of the hydraulic system are communicated through an oil inlet, an oil return port and two groups of working oil ports of the three-position seven-way reversing valve 7 to form a loop, and three groups of energy-saving oil ports are respectively cut off;

the three-position seven-way reversing valve 7 is located at an energy recovery position, two oil ports of the driving oil cylinder are in differential communication through two groups of working oil ports of the three-position seven-way reversing valve 7, the two groups of working oil ports are also respectively communicated with an energy-saving oil port connected with the energy accumulator 6 and an oil inlet connected to an oil inlet path of a hydraulic system, and the oil return port and two groups of energy-saving oil ports connected to the double-oil-source coupler 8 are respectively cut off;

the three-position seven-way reversing valve 7 is located at an energy release position, one oil port of the driving oil cylinder is communicated with an oil return path of the hydraulic system through one group of working oil ports and the oil inlet, the other group of working oil ports is closed, the oil return port is communicated with one group of energy-saving oil ports connected to the double-oil-source coupler 8, and the other oil port of the driving oil cylinder is respectively connected to an oil inlet path of the hydraulic system and the energy accumulator 6 through the double-oil-source coupler 8

Furthermore, a one-way valve is arranged in an energy recovery position of the three-position seven-way reversing valve 7 to realize one-way differential communication of working oil ports connected with two oil ports of the driving oil cylinder.

As a preferable scheme of the present invention, the dual oil source coupler 8 is a dual-cylinder coupler, and includes a first cylinder 81 and a second cylinder 82 which are arranged in parallel, the first cylinder 81 and a piston 83 inside the second cylinder 82 are synchronously connected, oil chambers inside the first cylinder 81 and the second cylinder 82 are respectively connected to two sets of energy-saving oil ports of the three-position seven-way reversing valve 7, and serve as oil inlet ends of the dual oil source coupler, another oil chamber of the first cylinder 81 or the second cylinder 82 is connected in parallel to one of the oil ports of the driving oil cylinder through an output end, and the oil chamber is connected to an oil tank through a one-way oil inlet path.

Further, a return spring 85 for returning the piston 83 is arranged inside the double-cylinder coupler.

As another preferred scheme of the present invention, the dual oil source coupler 8 is a dual-motor coupler, and includes two groups of coupling motors arranged in parallel, input ends of the two groups of coupling motors are respectively connected to two groups of energy-saving oil ports of the three-position seven-way reversing valve 7, and output ends of the two groups of coupling motors are connected in parallel and are converged and then connected in parallel to one of the oil ports of the driving oil cylinder.

In the energy recycling device, a one-way valve 9 is arranged on a parallel oil path of the double-oil-source coupler 8 and the driving oil cylinder.

By adopting the implementation of the technical scheme, the oil inlet and outlet paths of the driving oil cylinder of the external potential device are changed through the three-position seven-way reversing valve, the potential energy of the external potential device is efficiently recovered through a regenerative energy recovery mode of differential intercommunication of two oil cavities of the driving oil cylinder, the use of a pump and a motor with lower energy-saving efficiency is avoided, the output flow of a main pump can be reduced, or one main pump is omitted from a double-main-pump system to participate in work, so that the energy consumption is saved; the recovered hydraulic energy and the hydraulic energy provided by the hydraulic main pump are driven by the double-oil-source coupler and the energy accumulator to drive the driving oil cylinder to overcome potential energy again, the recovered energy is released more stably, and the working reliability of the device is improved.

The invention is further described with reference to the following figures and detailed description.

Drawings

Fig. 1a and 1b are schematic diagrams of a conventional hydraulic energy recycling device in the background art.

Fig. 2 is a hydraulic schematic diagram of the energy recovery and utilization device in the present embodiment.

Fig. 3a and 3b are schematic structural diagrams of two kinds of dual oil source couplers in this embodiment.

Reference numbers in the figures: 1-movable arm, 2-movable arm oil cylinder, 3-movable arm hydraulic system, 4-hydraulic main pump, 5-recovery pump, 6-energy accumulator, 7-three-position seven-way reversing valve, 8-double oil source coupler, 81-first cylinder, 82-second cylinder, 83-piston, 84-oil inlet path, 85-return spring, 86-first coupling motor, 87-second coupling motor and 9-one-way valve.

Detailed Description