CN108278186A - A kind of two-dimentional plunger hydraulic pamp of water-oil separating formula space cam transmission - Google Patents

A kind of two-dimentional plunger hydraulic pamp of water-oil separating formula space cam transmission Download PDF

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Publication number
CN108278186A
CN108278186A CN201711476990.6A CN201711476990A CN108278186A CN 108278186 A CN108278186 A CN 108278186A CN 201711476990 A CN201711476990 A CN 201711476990A CN 108278186 A CN108278186 A CN 108278186A
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CN
China
Prior art keywords
pump
space cam
cam
space
core
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Granted
Application number
CN201711476990.6A
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Chinese (zh)
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CN108278186B (en
Inventor
邢彤
阮健
王勇
虞儒敏
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Zhejiang University of Technology ZJUT
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Zhejiang University of Technology ZJUT
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Priority to CN201711476990.6A priority Critical patent/CN108278186B/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/20Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
    • F04B1/2014Details or component parts
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/128Driving means

Abstract

A kind of two-dimentional plunger hydraulic pamp of water-oil separating formula space cam transmission, including front pump shell, rear pump shell and the pump in stage casing main body, the front pump shell, rear pump shell are connect with pump main body, pump shaft is mounted on front pump cover, and the power of input is passed to space cam/cone roller transmission mechanism by pump shaft by lever body;It includes the pump housing, pump block, concentric ring, pump core and space cam/cone roller transmission mechanism to pump main body, pump shaft is overlapped with the centre of gyration of pump core, and the undercut groove in the window and pump housing centre bore on the axial groove and pump block of pump core upper plug constitutes the autogamy flow structure of two-dimentional plunger hydraulic pump;2 space cams/cone roller transmission mechanism is separately mounted to pump housing both sides, and 2 space cams are connect with pump core both ends respectively;The lever body includes the shift plate being fixed on pump shaft and the driving lever that is fixed on cam;The space cam/cone roller transmission mechanism is made of cone roller component and space cam.Improving performance, reduction manufacture difficulty and cost of the present invention.

Description

A kind of two-dimentional plunger hydraulic pamp of water-oil separating formula space cam transmission
Technical field
The present invention relates to a kind of hydraulic planger pump, belong to the hydraulic pump and hydraulic motor in Fluid-transmission and control field.
Background technology
All kinds of pluger type hydraulic pumps have approximate operation principle, i.e., in several plungers insertion cylinder bore, with pump shaft Rotation, swash plate (or flexural pivot or eccentric shaft or multiple-action inner curved ring etc.) constraint under, plunger makees the past of opposing cylinder successively Multiple movement, forms the swept volume of mechanical periodicity in cylinder bore, and flow is carried out by valve or valve disc.Plunger-type structure it is all kinds of In hydraulic pump, inclined disc type valve plate distribution structure is most representative and extensive use.The structure of inclined disc type valve plate distribution hydraulic pump is special Point is fixed using valve plate, axis structure and swash plate, and the rotation of main shaft drives cylinder body drives plunger to be rotated around pump shaft and in swash plate Constraint under it is reciprocating.Valve plate distribution has the characteristics that compact-sized, rotating speed is higher, suction capacity is good.Since there are cylinders The sliding friction pairs such as body/valve plate, flexural pivot, ram/cylinder hole, piston shoes/swash plate, the design and manufacture difficulty of pluger type hydraulic pump Height, cost are also higher.In addition, swash plate/piston shoes and cylinder body/valve plate friction pair bear prodigious uneven fluid pressure, friction When secondary relative motion, the secondary pv values that rub limit the raising of operating pressure or working speed.In addition, pump bearing is in power of toppling It is easily worn under the action of square, in turn results in the eccentric wear of valve plate.Above-mentioned reason so that the performance of pluger type hydraulic pump is not yet It is easy to further increase.
Invention content
Limited performance, the manufacture difficulty of existing pluger type hydraulic pump be larger, the higher deficiency of cost in order to overcome, the present invention A kind of improving performance is provided, reduces manufacture difficulty and the two-dimentional plunger hydraulic pamp of the water-oil separating formula space cam transmission of cost.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of two-dimentional plunger hydraulic pamp of water-oil separating formula space cam transmission, including front pump shell, rear pump shell and stage casing Main body is pumped, the front pump shell, rear pump shell are connect with pump main body, and pump shaft is mounted on front pump cover, and the pump shaft passes through lever body The power of input is passed into space cam/cone roller transmission mechanism;It includes the pump housing, pump block, concentric ring, pump core and sky to pump main body Between cam/cone roller transmission mechanism, pump shaft overlaps with the centre of gyration of pump core, the window on the axial groove and pump block of pump core upper plug Undercut groove in mouth and pump housing centre bore constitutes the autogamy flow structure of two-dimentional plunger hydraulic pump;2 space cams/cone roller transmission Mechanism is separately mounted to pump housing both sides, and 2 space cams are connect with pump core both ends respectively;
The lever body includes the shift plate being fixed on pump shaft and the driving lever that is fixed on space cam, shift plate both ends peace Equipped with the linear slide bearing parallel with pump shaft, driving lever one end is fixed on space cam, and the other end is inserted into linear slide bearing It is interior;When pump shaft and shift plate rotate, 2 driving levers are driven by linear slide bearing and the space cam connected with it is made to rotate;
The space cam/cone roller transmission mechanism is made of cone roller component and space cam, the cone roller component 2 rectangular boss and the pump housing and pump block for passing through the back side including turning rolls and its installed above 2 cone rollers, the turning rolls On slot connect to limit the rotation of turning rolls and pump block around pump core axis, by the fixed cam in pump core both ends by two rolling Wheel carrier is limited in the both sides of the pump housing;2 cone rollers use deep groove ball bearing and thrust bearing, are symmetrically mounted on turning rolls;It is empty Between cam be end face space cam, cam surface is similar to saddle, and when work contacts to form rolling pair simultaneously with 2 cone rollers;Front pump Space cam in shell is with the space cam working curved surface having the same in rear front pump shell, phase difference 90 when being connect with pump core Degree, i.e. two cams are that highest is corresponding with the phase of minimum point respectively;
In the pump housing, pump block and pump core in pump stage casing, transmission mechanism is immersed in the lubricating oil in pump case working fluid;It is described There is nitrogen chamber in rear pump shell tail portion, has aperture to be connected between nitrogen chamber and pump case, so that oil chamber is had by pressurized nitrogen certain Pressure so that lubricating oil interporal lacuna out of piston shaft and space guide rail enters pump block, by the sliding bearing in the guide rail of space Leakage slot the lubricating oil of leakage is converged with working fluid, and suction inlet is discharged to by the inner flow passage on pump block.
Further, 2 concentric rings are separately mounted on 2 turning rolls, as turning rolls is fixed on the both sides of the pump housing, and are inserted Enter the both ends of pump block;Pump core axis is passed through from turning rolls centre bore, and the plunger in pump core is formed with concentric ring end face and pump block endoporus Sealed volume.
Further, the autogamy flow structure refers to having circumferential equally distributed 4 to match chute on pump core plunger, this 4 Slot interval and the sealed volume of plunger both sides are linked up, and are had 2 high pressure oil-distribution ports, position to differ 180 degree on pump block, are inserted into the pump housing It is matched afterwards with high-pressure mouth undercut groove on the pump housing;Have 2 low pressure oil-distribution ports on pump block, position differs 180 degree, be inserted into after the pump housing with 2 suction inlets on the pump housing match.High-low pressure window phase differs 90 degree;When pump core rotates, 4 flows on pump core plunger The flow valve port that slot constitutes 2 pairs of suckings with 4 oil-distribution ports on pump block and extrudes, at this point, phase occurs for the volume of 2 sealed volumes Anti- variation, a cavity volume increases sucks liquid by a pair of of low pressure flow valve port from Pump Suction Nozzle, and another cavity volume subtracts Lacked a pair of of high pressure flow valve port working fluid is discharged from pump housing high-pressure mouth.
Beneficial effects of the present invention are mainly manifested in:Improving performance reduces manufacture difficulty and cost.
Description of the drawings
Fig. 1 is the front view of the two-dimentional plunger hydraulic pamp of the present invention.
Fig. 2 is the vertical view of the two-dimentional plunger hydraulic pamp of the present invention.
The left view of the two-dimentional plunger hydraulic pamp of Fig. 3 present invention.
Fig. 4 is lever body and the first cam 3-D view being attached thereto.
Fig. 5 is the 3-D view of space cam/cone roller driving mechanism.
Fig. 6 is the 3-D view in two-dimentional plunger hydraulic pamp stage casing.
Fig. 7 is the 3-D view of the second cam in rear pump shell.
Wherein, 1 pump shaft, 2 first deep groove ball bearings, 3 driving levers, 4 linear slide bearings, 5 shift plates, 6 first space cams, 7 First turning rolls, 8 pump blocks, 9 pump cores, 10 second turning rolls, 11 second space cams, 12 rear pump shells, 13 pump housings, 14 front pump shells, 15 first circlips, 16 first O-ring seals, 17 first socket head screws, 18 bearing baffle rings, 19 second circlips, 20 rotating seal rings, 21 straight pins, 22 third circlips, 23 second socket head screws, 24 concentric rings, 25 second is O-shaped close Seal, 26 third O-ring seals, 27 the 4th O-ring seals, 28 second straight pins, 29 the 4th circlips, 30 charge valves, 31 5th O-ring seal, 32 third socket head screws, 33 the 6th O-ring seals, 34 cone rollers, 35 rolling bearings, 36 idler wheels Axis, 37 holding screws, 38 thrust bearings, 39 springs.
Specific implementation mode
The invention will be further described below in conjunction with the accompanying drawings.
Referring to Fig.1~Fig. 7, a kind of two-dimentional plunger hydraulic pamp of water-oil separating formula space cam transmission, including front pump shell 14, The pump main body 13 of rear pump shell 12 and stage casing, the front pump shell 14, rear pump shell 12 are connect by screw with pump main body 13.
The pump shaft 1 is mounted on front pump cover 14, and it is convex that the power of input by lever body is passed to space by pump shaft 1 Wheel/cone roller transmission mechanism.It includes the pump housing, pump block 8, concentric rings 4,9 space cams of pump core/cone roller driver to pump main body 13 Structure.Pump shaft 1 is overlapped with the centre of gyration of pump core 9.In window and pump housing centre bore on the axial groove and pump block of 9 upper plug of pump core Undercut groove constitute the autogamy flow structure of two-dimentional plunger hydraulic pump.2 space cams/cone roller transmission mechanism is separately mounted to pump Body both sides, 2 space cams are connect with 9 both ends of pump core respectively.
The lever body includes the shift plate 5 being fixed on pump shaft 1 and is fixed on space cam (6 He of the first space cam Second space cam 11) on driving lever 3.5 both ends of shift plate are equipped with the linear slide bearing 4 parallel with pump shaft, and 3 one end of driving lever is solid It is scheduled on space cam, the other end is inserted into linear slide bearing 4.When pump shaft 1 and shift plate 5 rotate, pass through linear slide axis It holds 4 drive, 2 driving levers and the space cam connected with it is made to rotate.
The space cam/cone roller transmission mechanism, by cone roller component (including turning rolls and its installed above 2 Cone roller) and space cam composition.In 2 rectangular boss (identical as key effect) and the pump housing and pump block that turning rolls passes through the back side Slot connect to limit the rotation of turning rolls and pump block around pump core axis, by the fixed cam in pump core both ends by two idler wheels Frame is limited in the both sides of the pump housing;2 cone rollers use deep groove ball bearing and thrust bearing, are symmetrically mounted on turning rolls.Space Cam is end face space cam, and cam surface is similar to saddle, and when work contacts to form rolling pair simultaneously with 2 cone rollers.Front pump shell Interior space cam and the space cam working curved surface having the same in rear front pump shell, but when being connect with pump core, phase difference 90 Degree, that is to say, that two cams are that highest is corresponding with the phase of minimum point respectively.When space cam rotates, by cone roller Constraint, the spatial surface of cam forces itself and pump core axis axially movable, 2 cam alternating actions of pump housing both sides make with Its pump core being connected generates reciprocating motion.
2 concentric rings 4 are separately mounted on 2 turning rolls, as turning rolls is fixed on the both sides of the pump housing, and are inserted into pump The both ends of set;Pump core axis is passed through from turning rolls centre bore, and the plunger in pump core forms close with concentric ring end face and pump block endoporus Seal vessel.The autogamy flow structure of so-called two dimension plunger hydraulic pump refers to having circumferential equally distributed 4 flows on pump core plunger The sealed volume of slot, this 4 slot intervals and plunger both sides is linked up.There are 2 high pressure oil-distribution ports, position to differ 180 degree on pump block, It is matched with high-pressure mouth undercut groove on the pump housing after being inserted into the pump housing.There are 2 low pressure oil-distribution ports, position to differ 180 degree on pump block, is inserted into Match with 2 suction inlets on the pump housing after the pump housing.High-low pressure window phase differs 90 degree.When pump core rotates, pump core plunger The upper 4 flow valve ports for constituting 2 pairs of suckings with 4 oil-distribution ports on pump block with chute and extruding, at this point, 2 sealed volumes Opposite variation occurs for volume, and a cavity volume increases sucks liquid by a pair of of low pressure flow valve port from Pump Suction Nozzle, and another One cavity volume reduced a pair of of high pressure flow valve port and working fluid was discharged from pump housing high-pressure mouth.
The lubricating oil that water-oil separating refers in working fluid (water or seawater) and pump case in pump passes through certain structure and sealing Part separates.Working fluid is in the pump housing, pump block 8 and pump core 9 of pump main body, and transmission mechanism is immersed in the lubricating oil in pump case. In addition, there is nitrogen chamber in rear pump shell tail portion, there is aperture to be connected between nitrogen chamber and pump case, so that oil chamber is had by pressurized nitrogen Certain pressure so that lubricating oil interporal lacuna out of piston shaft and space guide rail enters pump block, passes through the sliding axle in the guide rail of space The leakage slot held converges the lubricating oil of leakage with working fluid, and is discharged to sucking by the inner flow passage on pump block Mouthful, to realize the reliable separation of grease, working fluid is avoided to leak into lubricating fluid.
The pump main body 13 of the present embodiment includes that (the first space is convex for the pump housing, pump block 8, concentric rings 4 and pump core 9 and space cam Wheel 6 and second space cam 11), pump block 8 is mounted in pump housing hole, and pump core 9 is inserted into pump block 8, and concentric rings 4 are inserted into pump block 8, Pump core 9 is passed through from turning rolls centre bore and is connected with space cam.
Lever body includes the shift plate 5 being fixed on pump shaft 1 and the driving lever 3 being fixed on space cam.Pacify at 5 both ends of shift plate Equipped with the linear slide bearing 4 parallel with pump shaft, 3 one end of driving lever is fixed on cam, and the other end is inserted into linear slide bearing 4 It is interior.
The pump block 8 and pump housing, the pump housing and front pump shell 14, rear pump shell 12 all use radial seal, by radial O-ring, Vibration when can efficiently reduce pump work is transmitted to outside, to reduce pump noise.
Cam working face is band certain taper, and axial coordinate is the curved surface changed by constant acceleration and deceleration motion.
2 rectangular boss (key) at the turning rolls back side are inserted into the slot on the pump housing and pump block, to realize while limit Turning rolls is with pump block around the rotation of pump core axis.
The turning rolls back side is inserted into concentric ring and is inserted into pump block and is connect with the pump housing and pump block by key, is connected firmly in pump core Cone roller frame is pressed on the pump housing by cam, and cone roller frame can be with axial inching.When the guide rail is by action of hydraulic force, cone roller It is pressed on cam work curved surface.
Spring 39 is housed, when turning rolls is mounted on pump housing both sides, spring is pressed in the slot of pump housing both sides on the key of the turning rolls back side On, turning rolls is pushed out, making turning rolls, there are one outside power so as to roller compression always on cam, to reduce pump Axial vibration.
4 oil-distribution ports on pump block 8 are rectangle, and 4 points of rectangular window process circular hole.So that high-low pressure chamber when flow Pocketed oil phenomenon does not occur when switching, reduces the hydrodynamic noise with head piece.
Lubricating oil is full of in front and back pump case, transmission parts, which are immersed in fluid, to be lubricated.
Pump case band pressurized nitrogen room pressurizes to the lubricating oil in pump case by the indoor pressure nitrogen gas of nitrogen so that lubrication Oil enters in the gap of piston and guide rail hole, prevents water from entering oil chamber, ensures grease reliable separation.
Leakage slot is opened on the endoporus of concentric rings 4, the inner flow passage of leakage is useful on pump block 8, by the Shui Herun of leakage Lubricating oil is discharged.

Claims (5)

1. a kind of two-dimentional plunger hydraulic pamp of water-oil separating formula space cam transmission, including front pump shell, rear pump shell and the pump in stage casing Main body, the front pump shell, rear pump shell are connect with pump main body, it is characterised in that:The pump shaft is mounted on front pump cover, and pump shaft passes through The power of input is passed to space cam/cone roller transmission mechanism by lever body;Pump main body include the pump housing, pump block, concentric ring, Pump core and space cam/cone roller transmission mechanism, pump shaft are overlapped with the centre of gyration of pump core, the axial groove and pump of pump core upper plug The autogamy flow structure of window and the two-dimentional plunger hydraulic pump of undercut groove composition in pump housing centre bore on set;2 space cam/cones Roller transmission mechanism is separately mounted to pump housing both sides, and 2 space cams are connect with pump core both ends respectively;
The lever body includes the shift plate being fixed on pump shaft and the driving lever that is fixed on space cam, and shift plate both ends are equipped with The linear slide bearing parallel with pump shaft, driving lever one end are fixed on space cam, and the other end is inserted into linear slide bearing;When When pump shaft and shift plate rotate, 2 driving levers are driven by linear slide bearing and the space cam connected with it is made to rotate;
The space cam/cone roller transmission mechanism is made of cone roller component and space cam, cone roller component, the cone rolling Wheel assembly includes turning rolls and its installed above 2 cone rollers, 2 rectangular boss and the pump housing that the turning rolls passes through the back side It connects to limit the rotation of turning rolls and pump block around pump core axis with the slot on pump block, passes through the fixed cam in pump core both ends Two turning rolls are limited in the both sides of the pump housing;2 cone rollers use deep groove ball bearing and thrust bearing, are symmetrically mounted on turning rolls On;Space cam is end face space cam, and cam surface is similar to saddle, and when work contacts to form rolling pair simultaneously with 2 cone rollers; Space cam in front pump shell is with the space cam working curved surface having the same in rear front pump shell, phase difference when being connect with pump core 90 degree, i.e. two cams are that highest is corresponding with the phase of minimum point respectively;
In the pump housing, pump block and pump core in pump stage casing, transmission mechanism is immersed in the lubricating oil in pump case working fluid;Pump after described There is nitrogen chamber in shell tail portion, has aperture to be connected between nitrogen chamber and pump case, so that oil chamber is had certain pressure by pressurized nitrogen, So that lubricating oil interporal lacuna out of piston shaft and space guide rail enters pump block, pass through the leakage on the sliding bearing in the guide rail of space Slot converges the lubricating oil of leakage with working fluid, and is discharged to suction inlet by the inner flow passage on pump block.
2. a kind of two-dimentional plunger hydraulic pamp of water-oil separating formula space cam transmission as described in claim 1, it is characterised in that: 2 concentric rings are separately mounted on 2 turning rolls, as turning rolls is fixed on the both sides of the pump housing, and are inserted into the both ends of pump block;Pump Mandrel is passed through from turning rolls centre bore, and the plunger in pump core forms sealed volume with concentric ring end face and pump block endoporus.
3. a kind of two-dimentional plunger hydraulic pamp of water-oil separating formula space cam transmission as claimed in claim 1 or 2, feature exist In:The autogamy flow structure refers to having circumferential equally distributed 4 to match chute, this 4 slot intervals and plunger two on pump core plunger The sealed volume of side is linked up, and has 2 high pressure oil-distribution ports, position to differ 180 degree on pump block, is inserted into after the pump housing and high pressure on the pump housing Mouth undercut groove matching;There are 2 low pressure oil-distribution ports, position to differ 180 degree on pump block, is inhaled with 2 on the pump housing after being inserted into the pump housing Entrance matches.High-low pressure window phase differs 90 degree;When pump core rotates, match chute and 4 on pump block for 4 on pump core plunger The flow valve port that oil-distribution port constitutes 2 pairs of suckings and extrudes, at this point, opposite variation, a chamber occur for the volume of 2 sealed volumes Volume increases sucks liquid by a pair of of low pressure flow valve port from Pump Suction Nozzle, and another cavity volume reduced a pair of of high pressure and matches It flows valve port working fluid is discharged from pump housing high-pressure mouth.
4. a kind of two-dimentional plunger hydraulic pamp of water-oil separating formula space cam transmission as claimed in claim 1 or 2, feature exist In:Spring is housed, when turning rolls is mounted on pump housing both sides, spring is pressed on the slot of pump housing both sides on the key of the turning rolls back side.
5. a kind of two-dimentional plunger hydraulic pamp of water-oil separating formula space cam transmission as claimed in claim 1 or 2, feature exist In:Pass through radial O-ring radial seal between the pump block and the pump housing, the pump housing and front pump shell, rear pump shell.
CN201711476990.6A 2017-12-29 2017-12-29 A kind of two-dimentional plunger hydraulic pamp of water-oil separating formula space cam transmission Active CN108278186B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110145448A (en) * 2019-05-23 2019-08-20 浙江大学城市学院 A kind of minitype high voltage plunger high-pressure water pump based on double freedom motor

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Publication number Priority date Publication date Assignee Title
CN85109057A (en) * 1985-10-08 1987-04-15 赵硕颀 The plunger of hydraulic machinery, roller mechanism
US7300260B1 (en) * 2003-10-31 2007-11-27 Sauer-Danfoss Inc. Special fluids for use in a hydrostatic transmission
JP2008164072A (en) * 2006-12-28 2008-07-17 Ntn Corp Swing bearing
CN104791208A (en) * 2015-04-01 2015-07-22 浙江工业大学 Two-dimensional constant acceleration and deceleration guide rail axial piston pump
CN105484962A (en) * 2015-12-18 2016-04-13 浙江工业大学 Two-dimensional dual axial piston pump
WO2016090058A2 (en) * 2014-12-03 2016-06-09 S-RAM Dynamics Piston drive assembly

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN85109057A (en) * 1985-10-08 1987-04-15 赵硕颀 The plunger of hydraulic machinery, roller mechanism
US7300260B1 (en) * 2003-10-31 2007-11-27 Sauer-Danfoss Inc. Special fluids for use in a hydrostatic transmission
JP2008164072A (en) * 2006-12-28 2008-07-17 Ntn Corp Swing bearing
WO2016090058A2 (en) * 2014-12-03 2016-06-09 S-RAM Dynamics Piston drive assembly
CN104791208A (en) * 2015-04-01 2015-07-22 浙江工业大学 Two-dimensional constant acceleration and deceleration guide rail axial piston pump
CN105484962A (en) * 2015-12-18 2016-04-13 浙江工业大学 Two-dimensional dual axial piston pump

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110145448A (en) * 2019-05-23 2019-08-20 浙江大学城市学院 A kind of minitype high voltage plunger high-pressure water pump based on double freedom motor

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