CN102758813B - Energy-recovery hydraulic system and engineering machinery - Google Patents
Energy-recovery hydraulic system and engineering machinery Download PDFInfo
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- CN102758813B CN102758813B CN201210271649.8A CN201210271649A CN102758813B CN 102758813 B CN102758813 B CN 102758813B CN 201210271649 A CN201210271649 A CN 201210271649A CN 102758813 B CN102758813 B CN 102758813B
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Abstract
The invention provides an energy-recovery hydraulic system, comprising a hydraulic motor, a first electromagnetic valve, a second electromagnetic valve, a first reversing valve, a hydraulic control valve, a plurality of energy accumulators, a hydraulic pump, a first one-way valve, a second one-way valve and a controller, wherein a first oil port and a second oil port of the hydraulic motor are respectively connected to the plurality of energy accumulators through the hydraulic control valve, and during braking, pressure oil supplied by the hydraulic motor is injected into the plurality of energy accumulators through the hydraulic valve. According to the energy-recovery hydraulic system, the plurality of energy accumulators are adopted for gradual energy storage, so that high energy recovery rate and wide recovery range are achieved; when recovered energy is low, the energy can also be utilized fully; in an energy release process, when the pressure in each energy accumulator is lower than a certain value, residual oil is taken as incoming oil of the hydraulic pump, so that the problem that the energy is more difficult to utilize when the pressure of the energy accumulators is lower is solved; and the energy-recovery hydraulic system is simple and convenient to implement and low in cost. The invention further provides engineering machinery consisting of the energy-recovery hydraulic system.
Description
Technical field
The present invention relates to technical field of hydraulic pressure, in particular to a kind of energy recovery hydraulic system and the engineering machinery comprising this energy recovery hydraulic system.
Background technique
Revolution is action very frequently in hydraulic shovel working procedure, and the frequent starting of swirl gear and braking can impact hydraulic system.Because the upper mechanism quality of rotating mechanism of dredger is large, revolution inertia is also large, will produce larger heat during braking.According to statistics, the pivotal energy ezpenditure of hydraulic shovel swirl gear accounts for 25% ~ 40% of excavator working procedure energy ezpenditure, and the heating value of revolution hydraulic circuit accounts for 30 ~ 40% of hydraulic system gross calorific power.Therefore, if rotary braking energy regenerating is got up, not only can reduce engine consumption, also protect hydraulic system and element.Meanwhile, the energy of recovery, for turning round start-up course, can reduce the load variations of turning round motor when starting, reduce engine consumption further.
At present, the measure of digger revolving Brake energy recovery mainly adopts oil electric mixed dynamic system and hydraulic hybrid power system.These measures achieve certain achievement in the oil consumption of reduction complete machine, but the electric component of oil electric mixed dynamic system needs is more and price is higher, specific power is low.Hydraulic hybrid power system cost is low, the life-span is long, specific power is high, and the specific power of hydraulic accumulator can reach 500 ~ 1000W/kg, the operating mode that when meeting digger revolving, instantaneous power demand is large.
At least there is following shortcoming in the energy recovery hydraulic system in correlation technique: hydraulic hybrid power system adopts an accumulator, under the capacity of accumulator and standard cycle, single rotary decelerating and braking energy matches, this system effect under standard cycle is better, but when there is the nonstandard design such as rotary decelerating and braking energy is less or larger, energy regenerating utilization ratio is lower; When energy storage pressure is close to Maximum operating pressure, the loss of energy regenerating oil hydraulic circuit strengthens, and the recovery rate reduces.
Summary of the invention
Consider above-mentioned background technology, an object of the present invention is to provide a kind of energy recovery hydraulic system, apply the hydraulic oil of multiple accumulator memory recall oil hydraulic circuit step by step, the energy regenerating utilization ratio of the operating modes such as rotary decelerating and braking energy is less or larger can be improved.Another object of the present invention there is provided a kind of engineering machinery comprising this energy recovery hydraulic system.
In view of this, according to an aspect of the present invention, provide a kind of energy recovery hydraulic system, comprise oil hydraulic motor, first solenoid valve, second solenoid valve, first selector valve, hydraulic control valve, multiple accumulator, oil hydraulic pump, first one-way valve, second one-way valve and controller, wherein, described hydraulic pressure delivery side of pump is connected respectively by the first hydraulic fluid port of described first solenoid valve and described second solenoid valve and described oil hydraulic motor and the second hydraulic fluid port through described first selector valve, described first selector valve controls the first hydraulic fluid port and second hydraulic fluid port oil-feed or the oil return of described oil hydraulic motor, described first solenoid valve is for cutting off or being communicated with the oil circuit between described first selector valve and described first hydraulic fluid port, described second solenoid valve is for cutting off or being communicated with the oil circuit between described first selector valve and described second hydraulic fluid port, first hydraulic fluid port of described oil hydraulic motor is connected with fuel tank by described first one-way valve, and the second hydraulic fluid port of described oil hydraulic motor is connected with described fuel tank by described second one-way valve, first hydraulic fluid port of described oil hydraulic motor and the second hydraulic fluid port are all connected to described multiple accumulator by described hydraulic control valve, and when braking, the pressure oil that described oil hydraulic motor provides injects described multiple accumulator by described hydraulic control valve, described controller is connected to described first solenoid valve and described second solenoid valve, judge whether to meet pressure difference setting value according to the pressure difference between two hydraulic fluid ports of described oil hydraulic motor, when meeting described pressure difference setting value, send signal to described first solenoid valve and described second solenoid valve, described first solenoid valve and described second solenoid valve are all closed.
When normal revolution work; first solenoid valve and the second solenoid valve are all opened; high pressure oil is transported to the first hydraulic fluid port of oil hydraulic motor by oil hydraulic pump through the first selector valve and the first solenoid valve; oil hydraulic motor normally works; or high pressure oil is transported to the second hydraulic fluid port of oil hydraulic motor by oil hydraulic pump through the first selector valve and the second solenoid valve valve, oil hydraulic motor normally works.
Suppose that swirl gear carries out rotating forward operation, by being arranged on oil hydraulic motor and the first solenoid valve, pressure transducer between second solenoid valve detects the pressure difference between oil hydraulic motor two hydraulic fluid ports, when pressure difference meets pressure difference setting value, controller controls the first solenoid valve and the second closed electromagnetic valve, oil hydraulic motor is because inertia is still in work, and suck low pressure oil through the first one-way valve from fuel tank, low pressure oil enters into oil hydraulic motor from the first hydraulic fluid port, low pressure oil changes into high pressure oil, high pressure oil enters into multiple accumulator from the second hydraulic fluid port respectively through hydraulic control valve, complete braking accumulation of energy.Energy recovery hydraulic system adopts multiple accumulator to store high pressure oil step by step, and energy recovery rate is high, and the oil pressure range of the hydraulic oil of recovery is large, also can abundant Ethylene recov force feed after oil hydraulic motor revolution inertia reduces.
In technique scheme, preferably, described multiple accumulator at least comprises the first accumulator and the second accumulator, described hydraulic control valve is connected with described first accumulator and described second accumulator respectively, when braking, the pressure oil from described oil hydraulic motor injects described first accumulator, when the force value of described first accumulator exceeds the cracking pressure of described hydraulic control valve through described hydraulic control valve, described hydraulic control valve commutation, makes the pressure oil from described oil hydraulic motor inject described second accumulator.
Energy recovery hydraulic system adopts multiple accumulator to store high pressure oil step by step, when braking, first the first accumulator carries out accumulation of energy, when the first energy storage pressure exceedes the cracking pressure of hydraulic control valve, namely the first accumulator is in full state, hydraulic oil enters the second accumulator and carries out accumulation of energy, achieves and stores high pressure oil step by step, improves the recovery utilization rate of whole system, realize multiple accumulator accumulation of energy by a hydraulic control valve to switch, system architecture is simple, is easy to realize, and cost is low.
In technique scheme, preferably, the oil circuit between first hydraulic fluid port and described hydraulic control valve of described oil hydraulic motor is provided with the 3rd one-way valve, the oil circuit between second hydraulic fluid port and described hydraulic control valve of described oil hydraulic motor is provided with the 4th one-way valve.
Energy recovery hydraulic system adopts the 3rd one-way valve and the 4th one-way valve, prevents the high pressure oil exported by the second hydraulic fluid port in braking process from flowing back to oil hydraulic motor, causes braking process long, affect braking effect.
In technique scheme, preferably, energy recovery hydraulic system also comprises the second selector valve, and described first accumulator can be connected with the filler opening of described oil hydraulic pump or oil outlet respectively through described second selector valve; When the pressure of described first accumulator is greater than the outlet pressure of described oil hydraulic pump, described controller sends signal to described second selector valve, controls described second selector valve commutation, described first accumulator is communicated with the oil outlet of described oil hydraulic pump; When the pressure of described first accumulator is less than the outlet pressure of described oil hydraulic pump, described controller sends signal to described second selector valve, controls described second selector valve commutation, described first accumulator is communicated with the filler opening of described oil hydraulic pump.
Controller detects the pressure difference on two loops by the pressure transducer be arranged on the first accumulation of energy loop upward pressure sensor and oil hydraulic pump oil outlet loop, and then control the valve position of the second change-over valve core, realize the high-pressure energy of the first accumulator directly for oil hydraulic motor provides power, reduce the load of oil hydraulic pump, improve the life-span of oil hydraulic pump, and with the reduction of the first accumulator energy, changed by the valve position of the second change-over valve core, the low voltage energy realizing the first accumulator is transported to oil hydraulic pump, improves the utilization ratio of braking energy.
Preferably, energy recovery hydraulic system also comprises the 5th one-way valve, is arranged on the pipeline between described second selector valve and described oil hydraulic pump oil outlet.
Energy recovery hydraulic system adopts the 5th one-way valve, and the high pressure oil preventing oil hydraulic pump oil outlet from exporting flows back to the second selector valve and flows into accumulator, and then affects the normal work of oil hydraulic motor, reduces pumping effect.
In technique scheme, preferably, energy recovery hydraulic system also comprises the 3rd solenoid valve, and described second accumulator is connected with the filler opening of described oil hydraulic pump through described 3rd solenoid valve; When driving load action, described controller sends signal to described 3rd solenoid valve, to open described 3rd solenoid valve, described second accumulator is communicated with the filler opening of described oil hydraulic pump.
Controller detects the pressure of the second accumulator by pressure transducer, and control the unlatching of the 3rd solenoid valve, the stored energy of the second accumulator is transported to the filler opening of oil hydraulic pump by the 3rd solenoid valve, reduce the filler opening of oil hydraulic pump, the pressure reduction of oil outlet, and then reduce the power consumpiton of oil hydraulic pump, improve the utilization ratio of braking energy.
In above-mentioned arbitrary technological scheme, preferably, energy recovery hydraulic system also comprises: the first pressure-limit valve and the second pressure-limit valve, the filler opening of described first pressure-limit valve is connected with the oil outlet of described first solenoid valve, the oil outlet of described first pressure-limit valve is connected with the filler opening of described first solenoid valve, the filler opening of described second pressure-limit valve is connected with the oil outlet of described second solenoid valve, and the oil outlet of described second pressure-limit valve is connected with the filler opening of described second solenoid valve.
In accumulator accumulation of energy process, when in recovered energy process, hydraulic system pressure is excessive, first pressure-limit valve or the second pressure-limit valve are opened and are carried out pressure release, ensure that the Security of accumulator and oil hydraulic motor, prevent accumulator and oil hydraulic motor from being impacted, improve the life-span of accumulator and oil hydraulic motor, and then improve the stability of energy recovery hydraulic system.
Preferably, described first pressure-limit valve and described second pressure-limit valve are relief valve.
In above-mentioned arbitrary technological scheme, preferably, described first solenoid valve and described second solenoid valve are 2/2-way solenoid valve, and described hydraulic control valve is two-bit triplet hydraulic control valve.
The oil circuit that two valve position controlling the first solenoid valve by controller realize oil hydraulic motor is communicated with oil hydraulic pump or disconnects; Two valve position controlling the second solenoid valve by controller realize being communicated with or disconnection of oil hydraulic motor and the first selector valve; By two valve position of the oil pressure cntrol hydraulic control valve of the first accumulator, realize the switching between the first accumulator and the second accumulator.
On the other hand, present invention also offers a kind of engineering machinery, comprise energy recovery hydraulic system as above.
In sum, energy recovery hydraulic system achieves the recycling of digger revolving decelerating and braking energy; Adopt multiple accumulator stored energy step by step, energy recovery rate is high, to reclaim scope wide, overcome the defect that single accumulator energy recovery rate is low; Even if when, recovered energy less at digger revolving inertia is lower, also can make full use of reclaimed energy, recovery utilization rate is higher; Energy release process, when pressure in accumulator is lower than certain value, using remaining fluid as oil hydraulic pump oil-feed, solve energy storage pressure lower time energy more difficult utilization problem; It is simple, convenient to implement, and cost is low.
Accompanying drawing explanation
Fig. 1 shows the schematic diagram of energy recovery hydraulic system according to an embodiment of the invention.
Wherein, the corresponding relation in Fig. 1 between reference character and component names is:
1 fuel tank; 2 the 6th one-way valves; 3 oil hydraulic pumps; 4 the 3rd solenoid valves; 6 controllers; 7 first selector valves; 8 second selector valves; 9 hydraulic control valve; 10 first pressure-limit valves; 11 second pressure-limit valves; 12 first solenoid valves; 13 second solenoid valves; 15 first one-way valves; 16 second one-way valves; 19 handles; 20 the 3rd one-way valves; 21 the 4th one-way valves; 22 the 5th one-way valves; 23 first accumulators; 24 second accumulators; 14 oil hydraulic motors; A first hydraulic fluid port; B second hydraulic fluid port; 51-55 pressure transducers.
Embodiment
In order to more clearly understand above-mentioned purpose of the present invention, feature and advantage, below in conjunction with the drawings and specific embodiments, the present invention is further described in detail.
Set forth a lot of detail in the following description so that fully understand the present invention, but the present invention can also adopt other to be different from other modes described here and implement, and therefore, the present invention is not limited to the restriction of following public specific embodiment.
As shown in Figure 1, energy recovery hydraulic system according to an embodiment of the invention, comprise oil hydraulic motor 14, first solenoid valve 12, second solenoid valve 13, first selector valve 7, hydraulic control valve 9, multiple accumulator, oil hydraulic pump 3, first one-way valve 15, second one-way valve 16 and controller 6, wherein, the outlet of oil hydraulic pump 3 is connected respectively by the first hydraulic fluid port A of the first solenoid valve 12 and the second solenoid valve 13 and oil hydraulic motor 14 and the second hydraulic fluid port B through the first selector valve 7, first hydraulic fluid port A of the first selector valve 7 hydraulic control motor 14 and the second hydraulic fluid port B oil-feed or oil return, first solenoid valve 12 is for cutting off or being communicated with the oil circuit between the first selector valve 7 and the first hydraulic fluid port A, second solenoid valve 13 is for cutting off or being communicated with the oil circuit between the first selector valve 7 and the second hydraulic fluid port B, first hydraulic fluid port A of oil hydraulic motor 14 is connected with fuel tank 1 (oil outlet of fuel tank 1 is also provided with the 6th one-way valve 2) by the first one-way valve 15, and the second hydraulic fluid port B of oil hydraulic motor 14 is connected with fuel tank 1 by the second one-way valve 16, first hydraulic fluid port A and the second hydraulic fluid port B of oil hydraulic motor 14 are all connected to multiple accumulator by hydraulic control valve 9, and when braking, the pressure oil that oil hydraulic motor 14 provides injects multiple accumulator by hydraulic control valve 9, controller 6 is connected to the first solenoid valve 12 and the second solenoid valve 13, judge whether to meet pressure difference setting value according to the pressure difference between two hydraulic fluid ports of oil hydraulic motor 14, when meeting pressure difference setting value, send signal to the first solenoid valve 12 and the second solenoid valve 13, the first solenoid valve 12 and the second solenoid valve 13 are all closed.
When normal revolution work; controller 6 exports control signal according to the operation signal of handle 19; first solenoid valve 12 and the second solenoid valve 13 are all opened; high pressure oil is transported to the first hydraulic fluid port A of oil hydraulic motor 14 by oil hydraulic pump 3 through the first selector valve 7 and the first solenoid valve 12; oil hydraulic motor 14 normally works; or high pressure oil is transported to the second hydraulic fluid port B of oil hydraulic motor by oil hydraulic pump through the first selector valve and the second solenoid valve valve, oil hydraulic motor 14 normally works.
Suppose that swirl gear carries out rotating forward operation, by being arranged on the pressure transducer 53 between the first hydraulic fluid port A of oil hydraulic motor 14 and the first solenoid valve 12, and the pressure transducer 54 be arranged between the second hydraulic fluid port B of oil hydraulic motor 14 and the second solenoid valve 13, detect the pressure difference between oil hydraulic motor 14 two hydraulic fluid ports, when pressure difference meets pressure difference setting value, controller 6 controls the first solenoid valve 12 and the second solenoid valve 13 cuts out, because inertia still becomes the effect of pump at the oil hydraulic motor 14 rotated, and suck low pressure oil through the first one-way valve from fuel tank 1, low pressure oil enters into oil hydraulic motor 14 from the first hydraulic fluid port A, low pressure oil changes into high pressure oil, high pressure oil enters into multiple accumulator from the second hydraulic fluid port B respectively through hydraulic control valve 9, complete braking accumulation of energy.Energy recovery hydraulic system adopts multiple accumulator to store high pressure oil step by step, and energy recovery rate is high, and the oil pressure range of the hydraulic oil of recovery is large, also can abundant Ethylene recov force feed after oil hydraulic motor revolution inertia reduces.
Further, multiple accumulator at least comprises the first accumulator 23 and the second accumulator 24, hydraulic control valve 9 is connected with the first accumulator 23 and the second accumulator 24 respectively, when braking, pressure oil from oil hydraulic motor 14 injects the first accumulator 23 through hydraulic control valve 9, when the force value of the first accumulator 23 exceeds the cracking pressure of hydraulic control valve 9, hydraulic control valve 9 commutates, and makes the pressure oil from oil hydraulic motor 14 inject the second accumulator 24.
Energy recovery hydraulic system adopts multiple accumulator to store high pressure oil step by step, when braking, first the first accumulator 23 carries out accumulation of energy, when the first accumulator 23 pressure exceedes the cracking pressure of hydraulic control valve 9, namely the first accumulator 23 is in full state, hydraulic oil enters the second accumulator 24 and carries out accumulation of energy, achieves and stores high pressure oil step by step, improve the recovery utilization rate of whole system, realize multiple accumulator accumulation of energy by a hydraulic control valve 9 to switch, system architecture is simple, is easy to realize, and cost is low.
In the present embodiment, the oil circuit between the first hydraulic fluid port A and hydraulic control valve 9 of oil hydraulic motor 14 is provided with the 3rd one-way valve 20, the oil circuit between the second hydraulic fluid port B and hydraulic control valve 9 of oil hydraulic motor 14 is provided with the 4th one-way valve 21.
Energy recovery hydraulic system adopts the 3rd one-way valve 20 and the 4th one-way valve 21, prevents the high pressure oil exported by the second hydraulic fluid port B in braking process from flowing back to oil hydraulic motor 14, causes braking process long, affect braking effect.
Energy recovery hydraulic system shown in Fig. 1 also comprises the second selector valve 8, first accumulator 23 and can be connected with the filler opening of oil hydraulic pump 3 or oil outlet respectively through the second selector valve 8; When the pressure of the first accumulator 23 is greater than the outlet pressure of oil hydraulic pump 3, controller 6 sends signal to the second selector valve 8, controls the second selector valve 8 and commutates, and the first accumulator 23 is communicated with the oil outlet of oil hydraulic pump 3; When the pressure of the first accumulator 23 is less than the outlet pressure of oil hydraulic pump 3, controller 6 sends signal to the second selector valve 8, controls the second selector valve 8 and commutates, and the first accumulator 23 is communicated with the filler opening of oil hydraulic pump 3.
The pressure of the first accumulation of energy 23 is detected by the pressure transducer 52 be arranged on the loop of the first accumulation of energy 23, and then control the valve position of the second change-over valve core, realize the high-pressure energy of the first accumulator 23 directly for oil hydraulic motor provides power, reduce the load of oil hydraulic pump, improve the life-span of oil hydraulic pump, and with the reduction of the first accumulator 23 energy, changed by the valve position of the second selector valve 8 spool, the low voltage energy realizing the first accumulator 23 is transported to oil hydraulic pump 3, improves the utilization ratio of braking energy.
Energy recovery hydraulic system also comprises the 5th one-way valve 22, is arranged on the pipeline between the second selector valve 8 and oil hydraulic pump 3 oil outlet.
Energy recovery hydraulic system adopts the 5th one-way valve 22, and the high pressure oil preventing oil hydraulic pump 3 oil outlet from exporting flows back to the second selector valve 8 and flows into accumulator, and then affects the normal work of oil hydraulic motor 14, reduces pumping effect.
Energy recovery hydraulic system also comprises the 3rd solenoid valve 4, second accumulator 24 is connected with the filler opening of oil hydraulic pump 3 through the 3rd solenoid valve 4, when driving load action, controller 6 sends signal to the 3rd solenoid valve 4, to open the 3rd solenoid valve 4, the second accumulator 24 is communicated with the filler opening of oil hydraulic pump 3.
Controller 6 obtains the pressure of the second accumulator 24 by pressure transducer 51, and control the unlatching of the 3rd solenoid valve 4, when needs second accumulator 24 releases energy, then open the 3rd solenoid valve 4, the stored energy of the second accumulator 24 is transported to the filler opening of oil hydraulic pump by the 3rd solenoid valve 4, reduce the filler opening of oil hydraulic pump, the pressure reduction of oil outlet, and then reduce the power consumpiton of oil hydraulic pump, improve the utilization ratio of braking energy; When detecting that the pressure of the second accumulator 24 is less than setting value, disconnect the 3rd solenoid valve 4.
Controller 6 also obtains the pressure of the first selector valve 7 in-line by the pressure transducer 55 at the filler opening place being arranged on the first selector valve 7.
In the present embodiment, first pressure-limit valve 10 and the second pressure-limit valve 11, the filler opening of the first pressure-limit valve 10 is connected with the oil outlet of the first solenoid valve 12, the oil outlet of the first pressure-limit valve 10 is connected with the filler opening of the first solenoid valve 12, the filler opening of the second pressure-limit valve 11 is connected with the oil outlet of the second solenoid valve 13, and the oil outlet of the second pressure-limit valve 11 is connected with the filler opening of the second solenoid valve 13.
In accumulator accumulation of energy process, when in recovered energy process, hydraulic system pressure is excessive, first pressure-limit valve 10 or the second pressure-limit valve 11 are opened and are carried out pressure release, ensure that the Security of accumulator and oil hydraulic motor 14, prevent accumulator and oil hydraulic motor 14 from being impacted, improve the life-span of accumulator and oil hydraulic motor 14, and then improve the stability of energy recovery hydraulic system.
As a kind of preferred implementation, the first pressure-limit valve 10 and the second pressure-limit valve 11 are relief valve.
When in recovered energy process, hydraulic system pressure is excessive; first pressure-limit valve 10 and the second pressure-limit valve 11 are opened; high pressure oil in loop is flow back in fuel tank 1 through the first selector valve 7; accumulator and oil hydraulic motor 14 are protected; prevent accumulator and oil hydraulic motor 14 from being impacted; improve the life-span of accumulator and oil hydraulic motor 14, and then improve the stability of energy recovery hydraulic system.
As a kind of preferred implementation, the first solenoid valve 13 and the second solenoid valve 12 are 2/2-way solenoid valve, and hydraulic control valve 9 is two-bit triplet hydraulic control valve.
The oil circuit that two valve position controlling the first solenoid valve 12 by controller 6 realize oil hydraulic motor is communicated with oil hydraulic pump 3 or disconnects; Two valve position controlling the second solenoid valve 13 by controller 6 realize being communicated with or disconnection of oil hydraulic motor 14 and the first selector valve 7; By two valve position of the oil pressure cntrol hydraulic control valve of the first accumulator 23, realize the switching between the first accumulator 23 and the second accumulator 24.
Energy recovery hydraulic system in above-described embodiment is applied on hydraulic shovel, an embodiment of hydraulic shovel of the present invention can be obtained.
Particularly, during excavator rotating forward work, as shown in Figure 1, the first selector valve 7 moves to right valve position, exports control signal and the first solenoid valve 12 and the second solenoid valve 13 are opened, connect oil hydraulic motor 14 two ends oil circuit with Time Controller 6 according to operation signal.At this moment the high pressure oil of oil hydraulic pump 3 enters oil hydraulic motor 14 through the first selector valve 7 and the first solenoid valve 12, and fuel-displaced from the first hydraulic fluid port A oil-feed of oil hydraulic motor 14, the second hydraulic fluid port B, motor rotates forward.Second hydraulic fluid port B oil return flows back to fuel tank 1 through the second solenoid valve 13 and the first selector valve 7.
During rotary decelerating braking, controller 6 judges according to the first hydraulic fluid port A of oil hydraulic motor 14, the pressure of the second hydraulic fluid port B, and when meeting energy regenerating condition, controller 6 exports control signal makes the first solenoid valve 12 and the second solenoid valve 13 close.Because inertia still becomes pumping action at the oil hydraulic motor 14 rotated, will suck low pressure oil through the first one-way valve 15 from fuel tank 1, at this moment, the first hydraulic fluid port A as the oil hydraulic motor 14 of pumping action enters low pressure oil, the second hydraulic fluid port B exports high pressure oil.The high pressure oil that second hydraulic fluid port B exports is through the 4th one-way valve 21 and hydraulic control valve 9, and when hydraulic control valve 9 fluid control pressure is lower than cracking pressure, hydraulic control valve 9 exports to be connected with the first accumulator 23, injects the first accumulator 23, thus realizes energy regenerating.
If rotary braking energy is comparatively large, the first accumulator 23 pressure constantly raises, and when exceeding the cracking pressure of hydraulic control valve 9, the spool of hydraulic control valve 9 moves, and oil circuit is switched to the second accumulator 24, thus remaining Brake energy recovery to the second accumulator 24.When accumulator oil circuit pressure is more than the second pressure-limit valve 11 setting pressure, this second pressure-limit valve 11 is opened, and fluid is through the second pressure-limit valve 11 and the first selector valve 7 oil sump tank 1.
In the present embodiment, energy recovery circuit adopts symmetric design, and during reversion, Brake energy recovery process is identical with Brake energy recovery process when rotating forward.
Reclaim and be stored in energy in the first accumulator 23 and the second accumulator 24 for turning round in startup and turning course.Operation is when carrying out revolution action, and controller 6 distributes the delivery volume of accumulator according to the flow direction of oil hydraulic pump 3 outlet pressure, the first accumulator 23 pressure and the second accumulator 24 Stress control the 3rd solenoid valve 4 and the second selector valve 8 and opening area size.
Wherein, when the first accumulator 23 pressure is higher, controller 6 outputs signal to the second selector valve 8, spool is moved to left, the fluid that first accumulator 23 discharges transports to the first selector valve 7 through the second selector valve 8 jointly with the fluid that oil hydraulic pump 3 exports, directly for oil hydraulic motor 14 provides power, reduce oil hydraulic pump 3 load.
Along with the release of the first accumulator 23 fluid, its pressure reduces gradually, when pressure is reduced to certain value, controller 6 outputs control signals to the second selector valve 8, spool is moved to right, the fluid that first accumulator 23 discharges transports to oil hydraulic pump 3 entrance through the second selector valve 8, when the first accumulator 23 pressure is low to moderate fuel tank 1 pressure, gives oil hydraulic pump 3 fuel feeding by fuel tank 1 through the 6th one-way valve 2.
The fluid that second accumulator 24 discharges is oil hydraulic pump entrance fuel feeding through the 3rd solenoid valve 4, reduces oil hydraulic pump 3 inlet outlet pressure differential, reduces oil hydraulic pump 3 power consumpiton.When the second accumulator 24 pressure is low to moderate fuel tank 1 pressure, by fuel tank 1 through one-way valve to oil hydraulic pump 3 fuel feeding.By above process, oil hydraulic pump 3 power consumpiton can be reduced, reduce engine loading, realize the effect that energy regenerating utilizes and reduces energy consumption.
Those skilled in the art should be appreciated that, although the energy recovery hydraulic system shown in Fig. 1 merely illustrates two accumulators, it also can comprise more accumulator, the quantity of accumulator is selected according to actual conditions, when the quantity of accumulator becomes three (namely increasing by the 3rd accumulator on the basis of Fig. 1), only need to increase a hydraulic control valve again between the second accumulator and the 3rd accumulator, as the accumulation of energy diverter switch of the second accumulator and the 3rd accumulator.
In sum, energy recovery hydraulic system achieves the recycling of digger revolving decelerating and braking energy; Adopt multiple accumulator stored energy step by step, energy recovery rate is high, to reclaim scope wide, overcome the defect that single accumulator energy recovery rate is low; Even if when, recovered energy less at digger revolving inertia is lower, also can make full use of reclaimed energy, recovery utilization rate is higher; Energy release process, when pressure in accumulator is lower than certain value, using remaining fluid as oil hydraulic pump oil-feed, solve energy storage pressure lower time energy more difficult utilization problem; It is simple, convenient to implement, and cost is low.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. an energy recovery hydraulic system, it is characterized in that, comprise: oil hydraulic motor (14), the first solenoid valve (12), the second solenoid valve (13), the first selector valve (7), hydraulic control valve (9), multiple accumulator, oil hydraulic pump (3), the first one-way valve (15), the second one-way valve (16) and controller (6), wherein
The outlet of described oil hydraulic pump (3) is connected respectively by first hydraulic fluid port (A) of described first solenoid valve (12) and described second solenoid valve (13) and described oil hydraulic motor (14) and the second hydraulic fluid port (B) through described first selector valve (7), described first selector valve (7) controls first hydraulic fluid port (A) of described oil hydraulic motor (14) and (B) oil-feed of the second hydraulic fluid port or oil return, described first solenoid valve (12) is for the oil circuit cut off or be communicated with between described first selector valve (7) and described first hydraulic fluid port (A), described second solenoid valve (13) is for the oil circuit cut off or be communicated with between described first selector valve (7) and described second hydraulic fluid port (B),
First hydraulic fluid port (A) of described oil hydraulic motor (14) is connected with fuel tank by described first one-way valve (15), and second hydraulic fluid port (B) of described oil hydraulic motor (14) is connected with described fuel tank by described second one-way valve (16);
First hydraulic fluid port (A) and second hydraulic fluid port (B) of described oil hydraulic motor (14) are all connected to described multiple accumulator by described hydraulic control valve (9), when braking, the pressure oil that described oil hydraulic motor (14) provides injects described multiple accumulator by described hydraulic control valve (9);
Described controller (6) is connected to described first solenoid valve (12) and described second solenoid valve (13), judge whether to meet pressure difference setting value according to the pressure difference between two hydraulic fluid ports of described oil hydraulic motor (14), when meeting described pressure difference setting value, send signal to described first solenoid valve (12) and described second solenoid valve (13), described first solenoid valve (12) and described second solenoid valve (13) are all closed;
Described multiple accumulator at least comprises the first accumulator (23) and the second accumulator (24), described hydraulic control valve (9) is connected with described first accumulator (23) and described second accumulator (24) respectively, when braking, pressure oil from described oil hydraulic motor (14) injects described first accumulator (23) through described hydraulic control valve (9), when the force value of described first accumulator (23) exceeds the cracking pressure of described hydraulic control valve (9), described hydraulic control valve (9) commutates, the pressure oil from described oil hydraulic motor (14) is made to inject described second accumulator (24),
Also comprise the second selector valve (8), described first accumulator (23) can be connected with the filler opening of described oil hydraulic pump (3) or oil outlet respectively through described second selector valve (8);
When the pressure of described first accumulator (23) is greater than the outlet pressure of described oil hydraulic pump (3), described controller (6) sends signal to described second selector valve (8), control the commutation of described second selector valve (8), described first accumulator (23) is communicated with the oil outlet of described oil hydraulic pump (3);
When the pressure of described first accumulator (23) is less than the outlet pressure of described oil hydraulic pump (3), described controller (6) sends signal to described second selector valve (8), control the commutation of described second selector valve (8), described first accumulator (23) is communicated with the filler opening of described oil hydraulic pump (3).
2. energy recovery hydraulic system according to claim 1, it is characterized in that, oil circuit between first hydraulic fluid port (A) and described hydraulic control valve (9) of described oil hydraulic motor (14) is provided with the 3rd one-way valve (20), the oil circuit between second hydraulic fluid port (B) and described hydraulic control valve (9) of described oil hydraulic motor (14) is provided with the 4th one-way valve (21).
3. energy recovery hydraulic system according to claim 1, is characterized in that, also comprises the 5th one-way valve (22), is arranged on the pipeline between described second selector valve (8) and described oil hydraulic pump (3) oil outlet.
4. energy recovery hydraulic system according to claim 1, it is characterized in that, also comprise the 3rd solenoid valve (4), described second accumulator (24) is connected with the filler opening of described oil hydraulic pump (3) through described 3rd solenoid valve (4);
When driving load action, described controller (6) sends signal to described 3rd solenoid valve (4), to open described 3rd solenoid valve (4), described second accumulator (24) is communicated with the filler opening of described oil hydraulic pump (3).
5. energy recovery hydraulic system according to any one of claim 1 to 4, it is characterized in that, also comprise: the first pressure-limit valve (10) and the second pressure-limit valve (11), the filler opening of described first pressure-limit valve (10) is connected with the oil outlet of described first solenoid valve (12), the oil outlet of described first pressure-limit valve (10) is connected with the filler opening of described first solenoid valve (12), the filler opening of described second pressure-limit valve (11) is connected with the oil outlet of described second solenoid valve (13), the oil outlet of described second pressure-limit valve (11) is connected with the filler opening of described second solenoid valve (13).
6. energy recovery hydraulic system according to claim 5, is characterized in that, described first pressure-limit valve (10) and described second pressure-limit valve (11) are relief valve.
7. energy recovery hydraulic system according to any one of claim 1 to 4, it is characterized in that, described first solenoid valve (13) and described second solenoid valve (12) are 2/2-way solenoid valve, and described hydraulic control valve (9) is two-bit triplet hydraulic control valve.
8. an engineering machinery, is characterized in that, comprises the energy recovery hydraulic system according to any one of claim 1 to 7.
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| CN113175450A (en) * | 2021-05-14 | 2021-07-27 | 华侨大学 | Closed electro-hydraulic control system for mechanical arm of asymmetric cylinder |
| CN113586532B (en) * | 2021-09-27 | 2021-12-21 | 徐州徐工挖掘机械有限公司 | Construction machine |
| CN114658777B (en) * | 2022-03-08 | 2023-12-26 | 浙江海宏液压科技股份有限公司 | Control method of hydraulic system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2076972U (en) * | 1990-11-21 | 1991-05-15 | 彭昌宗 | Fork lift truck energy-saving hydraulic control system |
| CN101324243A (en) * | 2008-06-26 | 2008-12-17 | 山东交通学院 | A storage and release energy control method for secondary regulation transmission system under non-constant pressure network |
| CN201297307Y (en) * | 2008-11-11 | 2009-08-26 | 浙江大学 | Hydraulic motor energy recycling system used as energy accumulator for hybrid electric engineering machinery |
| CN201649155U (en) * | 2010-02-05 | 2010-11-24 | 浙江大学 | Hydraulic Excavator Rotary Deceleration Braking Energy Recovery System |
| CN201972595U (en) * | 2010-10-20 | 2011-09-14 | 同济大学 | Rotary drilling rig energy-recuperation hydraulic device |
| CN102518169A (en) * | 2011-12-27 | 2012-06-27 | 山重建机(济宁)有限公司 | Hybrid hydraulic excavator |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6971463B2 (en) * | 2002-12-23 | 2005-12-06 | Cnh America Llc | Energy recovery system for work vehicle including hydraulic drive circuit and method of recovering energy |
| GB0614930D0 (en) * | 2006-07-27 | 2006-09-06 | Arternis Intelligent Power Ltd | Hydrostatic regenerative drive system |
-
2012
- 2012-08-01 CN CN201210271649.8A patent/CN102758813B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2076972U (en) * | 1990-11-21 | 1991-05-15 | 彭昌宗 | Fork lift truck energy-saving hydraulic control system |
| CN101324243A (en) * | 2008-06-26 | 2008-12-17 | 山东交通学院 | A storage and release energy control method for secondary regulation transmission system under non-constant pressure network |
| CN201297307Y (en) * | 2008-11-11 | 2009-08-26 | 浙江大学 | Hydraulic motor energy recycling system used as energy accumulator for hybrid electric engineering machinery |
| CN201649155U (en) * | 2010-02-05 | 2010-11-24 | 浙江大学 | Hydraulic Excavator Rotary Deceleration Braking Energy Recovery System |
| CN201972595U (en) * | 2010-10-20 | 2011-09-14 | 同济大学 | Rotary drilling rig energy-recuperation hydraulic device |
| CN102518169A (en) * | 2011-12-27 | 2012-06-27 | 山重建机(济宁)有限公司 | Hybrid hydraulic excavator |
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Effective date of registration: 20160309 Address after: The Yangcheng Lake Road Development Zone in Kunshan City, Jiangsu province 214300 No. 9999 room 7 Patentee after: Kunshan 31 Power Co., Ltd. Address before: 410100 Changsha economic and Technological Development Zone, Hunan City, the 31 industrial city Patentee before: Sanyi Heavy Industry Co., Ltd. |