CN105134578A - Plunger pump with energy recycling function - Google Patents
Plunger pump with energy recycling function Download PDFInfo
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- CN105134578A CN105134578A CN201510457427.9A CN201510457427A CN105134578A CN 105134578 A CN105134578 A CN 105134578A CN 201510457427 A CN201510457427 A CN 201510457427A CN 105134578 A CN105134578 A CN 105134578A
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Abstract
The invention discloses a plunger pump with the energy recycling function. The plunger pump comprises a variable pump body (2), a reset cylinder (1), a variable cylinder (3), a tilting tray angle changing feedback mechanism (10), a pressure control unit, a valve device and an electric proportional valve Y II (8). The valve device is used for selecting a pump control oil path and a motor control oil path. One oil port of the valve device is connected with the electric proportional valve Y II (8), and the other oil port of the valve device is connected with a pressure control unit. The variable pump body (2) is provided with a tilting tray. The pressure control unit is composed of a pressure stop valve and a load-sensitive flow control valve. The dual functions of a pump and the function of a motor can be achieved for the plunger pump through the both-way swinging of the tilting tray under the condition that the rotating direction of a main shaft and a high-pressure oil port are not changed. The load-sensitive pressure difference control, the constant-pressure cut-off control and the fixed displacement control can be achieved when the plunger pump serves as the pump in use. The electromagnetic proportional displacement control can be achieved when the plunger pump serves as the motor, and free switching between the function of the pump and the function of the motor can be achieved through the valve device.
Description
Technical field
The present invention relates to a kind of plunger pump possessing energy recovery function.
Background technique
In oblique tray type axial plunger piston variable pump, when transmission shaft constant in a kind of rotation direction (left-handed or dextrorotation) and high pressure hydraulic fluid port is constant time, realize the switching of pump condition and motor operating conditions if want, only the inclination angle of swash plate need be changed to negative angle from positive-angle.The working principle of enclosed pump is similar with it.
In current hydraulic element, be applied to the pump motor product of open circuit, the special oil hydraulic pump of a A4VSO of such as BOSCH-REXROTH,
This plunger pump promotes the change between a ° → 0 →-a ° of swash plate pivot angle by double-action plunger cylinder, its inside can realize the accurate control of discharge capacity by the machinery-electrically-hydraulic servomechanism of a set of complexity, this pump can realize energy recovery function, but cost is very high.
In addition, a very common open type variable displacement pump A10VO/31 of BOSCH-REXROTH, it adopts twin columns plug cylinder to promote swashplate angle change, and its swash plate pivot angle possesses the possibility that positive negative direction swings.
Summary of the invention
For above-mentioned prior art Problems existing, the invention provides a kind of plunger pump possessing energy recovery function, the mode superposed by stroking mechanism realizes Ioad-sensing control pump, metering pump, electric ratio change displacement motor three kinds of functions.
To achieve these goals, the technical solution used in the present invention is: a kind of plunger pump possessing energy recovery function, comprise variable displacement pump main body, restoring cylinder, variable cylinder, swash plate angle change feedback mechanism, pressure control unit, valving and electric proportional valve Y II, described valving is used for selecting pump and motor two kinds of oil circuit controls
Valving one hydraulic fluid port connects electric proportional valve Y II, another hydraulic fluid port Bonding pressure control unit,
Variable displacement pump main body is provided with swash plate; Variable displacement pump main body connecting drive device, variable displacement pump main body connects oil pump suction mouth S, and described pressure control unit is made up of pressure shut-off valve, load-sensitive flow control valve.
Described valving is two-position three way magnetic valve or shuttle valve.
Between described valving with the oil circuit be communicated with between electric proportional valve, there is damping.
Variable displacement pump main body oil outlet connects oil pump external control oil sources interface G and oil pump oil outlet B respectively, oil outlet connects and connects oil pump external control oil sources interface G by the first shuttle valve, when pump discharge pressure higher time control liquefaction source is from pump discharge, when pump discharge lower time control liquefaction source is from outside control mouth G, to realize the stability contorting of pump displacement
Restoring cylinder promotes the swash plate of variable displacement pump main body, the oil outlet of the oilhole link variable pump main body of restoring cylinder,
The outlet of the first shuttle valve is with the hydraulic fluid port 1 of electric proportional valve Y II, the hydraulic fluid port 1 of pressure shut-off valve, the control port of pressure shut-off valve; The hydraulic fluid port 1 of load-sensitive flow control valve is connected with the control port of load-sensitive flow control valve,
The hydraulic fluid port 3 of electric proportional valve Y II is connected with the hydraulic fluid port 1 of two-position three way magnetic valve Y I,
The hydraulic fluid port 3 link variable cylinder of two-position three way magnetic valve Y I, the hydraulic fluid port 3 of the hydraulic fluid port 2 Bonding pressure cut-off valve of two-position three way magnetic valve Y I, the hydraulic fluid port 2 of pressure shut-off valve connects the hydraulic fluid port 3 of load-sensitive flow control valve, and oil circuit connects the hydraulic fluid port 2 of electric proportional valve Y II, the hydraulic fluid port 2 of load-sensitive flow control valve and oil pump drain tap L.
Described swash plate angle change feedback mechanism is installed on swash plate axis of rotation, variable cylinder or restoring cylinder, for feeding back swash plate angle change.
Described variable displacement pump main body also connects oil pump drain tap L.
Described control oil sources interface G only connects in a motoring mode, and when using as pump, this oil sources disconnects.
Electric proportional valve Y II and swash plate angle change between feedback mechanism and are provided with swashplate position feedback spring.
Described swashplate position feedback spring only works under motor function, does not contact under pump condition with swash plate angle feedback mechanism.
Swash plate can realize positive and negative swinging angle control, and positive pivot angle scope is pump condition, and negative pivot angle scope is motor operating conditions, and pump condition is load sense and constant voltage cutting-off controlling, and motor operating conditions is the electric proportional displacement control of internal mechanical feedback.
Variable displacement pump main body oil outlet connects oil pump external control oil sources interface G and oil pump oil outlet B respectively, oil outlet connects and connects oil pump external control oil sources interface G by the first shuttle valve, when pump discharge pressure higher time control liquefaction source is from pump discharge, when pump discharge lower time control liquefaction source is from outside control mouth G, to realize the stability contorting of pump displacement
Restoring cylinder is connected with the swash plate of the variable displacement pump main body of outer end, the oil outlet of the oilhole link variable pump main body of restoring cylinder,
Another kind of scheme, the outlet of the first shuttle valve is with the hydraulic fluid port 1 of electric proportional valve Y II, the hydraulic fluid port 1 of pressure shut-off valve, the control port of pressure shut-off valve; The hydraulic fluid port 1 of load-sensitive flow control valve is connected with the control port of load-sensitive flow control valve,
The hydraulic fluid port link variable cylinder of the second shuttle valve, the in addition hydraulic fluid port at the two ends hydraulic fluid port 3 of Bonding pressure cut-off valve and the hydraulic fluid port 3 of electric proportional valve Y II respectively, the hydraulic fluid port 2 of pressure shut-off valve connects the hydraulic fluid port 3 of load-sensitive flow control valve,
Oil circuit connects the hydraulic fluid port 2 of electric proportional valve Y II, the hydraulic fluid port 2 of load-sensitive flow control valve and oil pump drain tap L.
The present invention is based on the body of common plate variable plunger pump, realized the independent operating of three kinds of mode of operations by stroking mechanism change design;
By the position feedback of swash plate within the scope of negative pivot angle, realize the discharge capacity proportional control of motor operating conditions;
Switched the transformation of three kinds of mode of operations by solenoid valve, do not interfere with each other.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is the optimized project of embodiment 1.
Fig. 3 is another kind of embodiment.
In figure: 1, restoring cylinder, 2, oil pump main body, 3, variable cylinder, 4, two-position three way magnetic valve Y I, 5, pressure shut-off valve, 6, load-sensitive flow control valve, the 7, first shuttle valve, 8, electric proportional valve Y II, 9, swashplate position feedback spring, 10, swash plate angle feedback mechanism, 11, damping, the 12, second shuttle valve.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
As shown in Figure 1, a kind of plunger pump possessing energy recovery function, is characterized in that, comprises variable displacement pump main body 2, restoring cylinder 1, variable cylinder 3, first shuttle valve 7;
Variable displacement pump main body 2 is provided with swash plate; Variable displacement pump main body 2 connects motor, and variable displacement pump main body 2 connects oil pump suction mouth S,
Variable displacement pump main body 2 oil outlet connects oil pump external control oil sources interface G and oil pump oil outlet B respectively, and oil outlet connects and connects oil pump external control oil sources interface G by the first shuttle valve 7,
Restoring cylinder 1 is connected with the swash plate of the variable displacement pump main body 2 of outer end, the oil outlet of the oilhole link variable pump main body 2 of restoring cylinder 1,
Variable cylinder 3 is provided with swash plate angle change feedback mechanism 10,
Point hydraulic fluid port of the first shuttle valve 7 is with the hydraulic fluid port 1 of electric proportional valve Y II 8, the hydraulic fluid port 1 of pressure shut-off valve, the control port of pressure shut-off valve 5; The hydraulic fluid port 1 of load-sensitive flow control valve 6 is connected with the control port of load-sensitive flow control valve 6,
The hydraulic fluid port 3 of electric proportional valve Y II 8 is connected with the hydraulic fluid port 1 of two-position three way magnetic valve Y I 4,
The hydraulic fluid port 3 of the hydraulic fluid port 2 Bonding pressure cut-off valve 5 of the hydraulic fluid port 3 link variable cylinder 3, two-position three way magnetic valve Y I 4 of two-position three way magnetic valve Y I 4, the hydraulic fluid port 2 of pressure shut-off valve 5 connects the hydraulic fluid port 3 of load-sensitive flow control valve 6,
Oil circuit 100 connects the hydraulic fluid port 2 of electric proportional valve Y II 8, the hydraulic fluid port 2 of load-sensitive flow control valve 6 and oil pump drain tap L,
The comparison pump discharge pressure of load-sensitive flow control valve 6, the hydraulic fluid port of pressure shut-off valve 5 is connected with load pressure feedback hydraulic fluid port x.
Described variable displacement pump main body 2 also connects oil pump drain tap L.
Described control oil sources interface G only connects in a motoring mode, and when using as pump, this oil sources disconnects.
Electric proportional valve Y II 8 and swash plate angle change between feedback mechanism 10 and are provided with swashplate position feedback spring 9.
Described swashplate position feedback spring 9 only works under motor function, does not contact this device and can realize three kinds of mode of operation independent operatings by the control of internal electrical magnet valve, do not interfere with each other under pump condition with swash plate angle feedback mechanism 10.
As another kind of embodiment, between the oil circuit be communicated with between two-position three way magnetic valve Y I and electric proportional valve Y II 8 as shown in Figure 2, increase damping 11, for dynamic response performance during governor motor variable,
Also has a kind of mode of execution, be with the difference of embodiment 2, two-position three way magnetic valve Y I is replaced with the second shuttle valve 41, as shown in Figure 3, the hydraulic fluid port link variable cylinder 3 of the second shuttle valve 41, the in addition hydraulic fluid port at the two ends hydraulic fluid port 3 of Bonding pressure cut-off valve 5 and the hydraulic fluid port 3 of electric proportional valve Y II 8 respectively, the hydraulic fluid port 2 of pressure shut-off valve 5 connects the hydraulic fluid port 3 of load-sensitive flow control valve 6, second shuttle valve can be selected pump and motor two kinds of oil circuit controls, ensures that two kinds of control modes do not interfere with each other.
1) load-reacting pump condition:
I.e. initial operating mode (two-position three way magnetic valve Y I, electric proportional valve Y II all must not be electric), comparing pump discharge pressure by load-sensitive flow control valve 6 regulates swash plate angle to swing within the scope of 0 ~ a ° (swash plate is in 0 ~ a ° of corresponding oil pump and is in minimum injection rate to maximum pump discharge), to meet system flow demand with X mouth load feedback pressure difference value.
When pump discharge pressure reaches pressure shut-off valve 5 setting pressure, pressure shut-off valve 5 commutates to left position, pump discharge high pressure oil is successively by control valve 5, the large chamber of control valve 4 entering variable cylinder, make variable cylinder to left movement, promote swash plate and be flapped toward minimum injection rate position, oil pump is output flow no longer, ensures its non-overloading.This mode of operation principle is consistent with conventional A10VDFR type pump.
2) metering pump operating mode:
When two-position three way magnetic valve Y I electric commutation to left position, electric proportional valve Y II must not electricity be in right position time, variable cylinder 3 large chamber fluid to be communicated with L mouth by electric proportional valve 8 and to realize pressure release, restoring cylinder 1 is under the effect of spring force and B mouth pressure, promote the displacement (a °) that swash plate is in pump always, now oil pump can be used as metering pump use.
3) electric rate variable motor operating conditions:
Y II is the electric proportional control valve be directly proportional to motor displacement, and supposing that it effectively controls current range is 200 ~ 600mA, then 200mA its minimum injection rate corresponding, 600mA its maximum pump discharge corresponding.
When G mouth connect pilot pressure oil, the obstructed oil of B mouth, electric proportional valve Y II electricly be in left position (controlling electric current 600mA), two-position three way magnetic valve Y I electricly must be in left position time, pilot pressure oil is successively by the first shuttle valve 7, proportional electromagnetic valve 8, the large chamber of the large plunger of solenoid valve 4 entering variable cylinder, promote the large plunger of variable cylinder to be moved to the left, make swash plate change to motor displacement (-a °) from the displacement (a °) of pump always, realize the switching of pump condition to motor operating conditions.Meanwhile, swash plate angle change feedback mechanism 10 compresses swashplate position feedback spring 9, and realize swash plate positions force feedback, after the feedback force be subject to when Proportional valve 6 and electromagnetic force reach balance, variable cylinder 3 stop motion, swash plate is in motor displacement.
Now, when B mouth connects high pressure oil, namely this device can be used as motor and drives transmission shaft to carry out moment of torsion output, realizes the utilization of recovered energy.
When reducing electric proportional valve Y II and controlling electric current, electric proportional valve spool stress balance is broken, and spool moves to left, and variable cylinder large chamber fluid and L oral groove lead to, and variable cylinder moves to right, and motor displacement reduces.Regulate Proportional valve 8 to control electric current and can realize motor displacement adjustment.
4) swashplate position feedback spring only works under motor function, does not contact, do not play feedback effect under pump condition with feedback mechanism 10,
5) G mouth control oil sources is only connected in a motoring mode, and when using as pump, this oil sources disconnects, inoperative.
Apply in arbitrary technological scheme disclosed in the invention described above for represent position relationship or shape term unless otherwise stated its implication comprise approximate with it, similar or close state or shape.Arbitrary parts provided by the invention both can be assembled by multiple independent constituent element, and also can be one of the forming manufacture technics separate part out.
Finally should be noted that: above embodiment is only in order to illustrate that technological scheme of the present invention is not intended to limit; Although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or carry out equivalent replacement to portion of techniques feature; And not departing from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technological scheme scope of request of the present invention protection.
Claims (11)
1. one kind possesses the plunger pump of energy recovery function, it is characterized in that, comprise variable displacement pump main body (2), restoring cylinder (1), variable cylinder (3), swash plate angle change feedback mechanism (10), pressure control unit, valving and electric proportional valve Y II (8), described valving is used for selecting pump and motor two kinds of oil circuit controls
Valving one hydraulic fluid port connects electric proportional valve Y II (8), another hydraulic fluid port Bonding pressure control unit, and variable displacement pump main body (2) is provided with swash plate; Variable displacement pump main body (2) connecting drive device, variable displacement pump main body (2) connects oil pump suction mouth S, and described pressure control unit is made up of pressure shut-off valve, load-sensitive flow control valve.
2. a kind of plunger pump possessing energy recovery function according to claim 1, is characterized in that, described valving is two-position three way magnetic valve or shuttle valve.
3. a kind of plunger pump possessing energy recovery function according to claim 1, is characterized in that, has the damping for dynamic response performance during governor motor variable between described valving with electric proportional valve Y II (8) between the oil circuit be communicated with.
4. a kind of plunger pump possessing energy recovery function according to claim 2, it is characterized in that, oil circuit control by the first shuttle valve (7) respectively with pump hydraulic fluid port B and be communicated with outside control mouth G, by the effect of the first shuttle valve (7), the pressure that can realize when pumping hydraulic fluid port B is greater than the pressure time control liquefaction source of outside control mouth G from pumping hydraulic fluid port B, when pumping hydraulic fluid port lower than G mouth pressure time control liquefaction source from outside control mouth G, to realize the stability contorting of pump displacement
Restoring cylinder (1) promotes the swash plate of variable displacement pump main body (2), the oil outlet of oilhole link variable pump main body (2) of restoring cylinder (1),
The outlet of the first shuttle valve (7) is with the hydraulic fluid port 1 of electric proportional valve Y II (8), the hydraulic fluid port 1 of pressure shut-off valve, the control port of pressure shut-off valve (5); The hydraulic fluid port 1 of load-sensitive flow control valve (6) is connected with the control port of load-sensitive flow control valve (6),
The hydraulic fluid port 3 of electric proportional valve Y II (8) is connected with the hydraulic fluid port 1 of two-position three way magnetic valve Y I (4),
Hydraulic fluid port 3 link variable cylinder (3) of two-position three way magnetic valve Y I (4), the hydraulic fluid port 3 of hydraulic fluid port 2 Bonding pressure cut-off valve (5) of two-position three way magnetic valve Y I (4), the hydraulic fluid port 2 of pressure shut-off valve (5) connects the hydraulic fluid port 3 of load-sensitive flow control valve (6), and oil circuit (100) connects the hydraulic fluid port 2 of electric proportional valve Y II (8), the hydraulic fluid port 2 of load-sensitive flow control valve (6) and oil pump drain tap L.
5. a kind of plunger pump possessing energy recovery function according to claim 2, it is characterized in that, variable displacement pump main body (2) oil outlet connects oil pump external control oil sources interface G and oil pump oil outlet B respectively, oil outlet connects and connects oil pump external control oil sources interface G by the first shuttle valve (7), when pump discharge pressure higher time control liquefaction source is from pump discharge, when pump discharge lower time control liquefaction source is from outside control mouth G, to realize the stability contorting of pump displacement.
Restoring cylinder (1) is connected with the swash plate of the variable displacement pump main body (2) of outer end, the oil outlet of oilhole link variable pump main body (2) of restoring cylinder (1),
The outlet of the first shuttle valve (7) is with the hydraulic fluid port 1 of electric proportional valve Y II (8), the hydraulic fluid port 1 of pressure shut-off valve, the control port of pressure shut-off valve (5); The hydraulic fluid port 1 of load-sensitive flow control valve (6) is connected with the control port of load-sensitive flow control valve (6),
The hydraulic fluid port link variable cylinder (3) of the second shuttle valve (41), the hydraulic fluid port at the two ends hydraulic fluid port 3 of Bonding pressure cut-off valve (5) and the hydraulic fluid port 3 of electric proportional valve Y II (8) respectively in addition, the hydraulic fluid port 2 of pressure shut-off valve (5) connects the hydraulic fluid port 3 of load-sensitive flow control valve (6)
Oil circuit (100) connects the hydraulic fluid port 2 of electric proportional valve Y II (8), the hydraulic fluid port 2 of load-sensitive flow control valve (6) and oil pump drain tap L.
6. a kind of plunger pump possessing energy recovery function according to claim 4 or 5, is characterized in that, described swash plate angle change feedback mechanism (10) is installed on swash plate axis of rotation, variable cylinder or restoring cylinder, for feeding back swash plate angle change.
7. a kind of plunger pump possessing energy recovery function according to claim 4 or 5, is characterized in that described variable displacement pump main body (2) also connects oil pump drain tap L.
8. a kind of plunger pump possessing energy recovery function according to claim 4 or 5, it is characterized in that described control oil sources interface G only connects in a motoring mode, when using as pump, this oil sources disconnects.
9. a kind of plunger pump possessing energy recovery function according to claim 4 or 5, is characterized in that electric proportional valve Y II (8) and swash plate angle change between feedback mechanism (10) and is provided with swashplate position feedback spring (9).
10. a kind of plunger pump possessing energy recovery function according to claim 4 or 5, is characterized in that described swashplate position feedback spring (9) only works under motor function, does not contact under pump condition with swash plate angle feedback mechanism (10).
11. a kind of plunger pumps possessing energy recovery function according to claim 4 or 5, it is characterized in that, swash plate can realize positive and negative swinging angle control, positive pivot angle scope is pump condition, negative pivot angle scope is motor operating conditions, pump condition is load sense and constant voltage cutting-off controlling, and motor operating conditions is the electric proportional displacement control of internal mechanical feedback.
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| CN201510457427.9A CN105134578A (en) | 2015-07-30 | 2015-07-30 | Plunger pump with energy recycling function |
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| CN201510457427.9A CN105134578A (en) | 2015-07-30 | 2015-07-30 | Plunger pump with energy recycling function |
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| CN106089868A (en) * | 2016-08-09 | 2016-11-09 | 徐州重型机械有限公司 | Energy recovery pump, road vehicle and engineering machinery |
| CN106194680A (en) * | 2016-08-28 | 2016-12-07 | 中航力源液压股份有限公司 | The axial plunger pump installation of a kind of high accuracy electric proportional control and control method |
| CN106351813A (en) * | 2016-10-26 | 2017-01-25 | 中航力源液压股份有限公司 | Compact swash plate type electric proportional axial plunger pump and control method thereof |
| CN107327426A (en) * | 2016-01-28 | 2017-11-07 | 邓贲 | A kind of force control hydraulic pressure energy saving of system method and its energy saver |
| CN107906064A (en) * | 2017-12-25 | 2018-04-13 | 邵阳维克液压股份有限公司 | The device and variable method for control speed of changeable constant pressure variable displacement pump variable speed |
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Application publication date: 20151209 |