CN106609753B - Merge gerotor pump and motor - Google Patents

Merge gerotor pump and motor Download PDF

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Publication number
CN106609753B
CN106609753B CN201610917140.4A CN201610917140A CN106609753B CN 106609753 B CN106609753 B CN 106609753B CN 201610917140 A CN201610917140 A CN 201610917140A CN 106609753 B CN106609753 B CN 106609753B
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conduit
rotor
cavity body
fusion
structural cavity
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CN106609753A (en
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不公告发明人
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Luo Tian Zhen
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Luo Tian Zhen
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00Rotary-piston machines or pumps
    • F04C2/30Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C2/34Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members
    • F04C2/344Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03CPOSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C2/00Rotary-piston engines
    • F03C2/30Rotary-piston engines having the characteristics covered by two or more of groups F03C2/02, F03C2/08, F03C2/22, F03C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F03C2/304Rotary-piston engines having the characteristics covered by two or more of groups F03C2/02, F03C2/08, F03C2/22, F03C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having both the movements defined in sub-group F03C2/08 or F03C2/22 and relative reciprocation between members
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0003Sealing arrangements in rotary-piston machines or pumps

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Rotary Pumps (AREA)

Abstract

Merge gerotor pump and motor;Belong to mechanical realization field;It is made of fusion rotor (1), structural cavity body (2), thrust spring piece (3) or axial limiting construction and gear piece (4) or body component etc.;Fusion rotor (1) be mounted among structural cavity body (2) as pivoting part and with inner surface be to be fitted close either clearance fit relationship, the function of thrust spring piece (3) or axial limiting construction is to maintain it and the inner surface of structural cavity body (2) is fitted close or with clearance fit;It is fixed on and is slided into fusion rotor conduit in the gear piece (4) of structural cavity body or the tooth tip portion of body component;The sectional area of conduit is being overlapped angular area linear decrease until to zero, and the depth of slot is also just gradually decremented to zero;The area of conduit surface gear piece below is fallen into, one is linear decrease, the other is linear increment;The sum of their area remains unchanged;Thus theoretically obtain absolute peerless linear convergent rate;In addition this technology is easy to accomplish atomic discharge capacity;Splendid sealing characteristics;It is widely used in the steadily application of output and extra small discharge capacity.

Description

Merge gerotor pump and motor
[technical field]
The invention belongs to mechanical manufacturing fields.
[background technique]
The current rough performance of various positive displacement pumps and advantage and disadvantage are as follows:
It can not theoretically accomplish that absolutely at the uniform velocity discharge capacity exports;Absolutely at the uniform velocity torque exports
Vane pump: the structure of vane pump is compared with gear pump complexity, but its operating pressure is higher, and flow pulsation is small, and work is flat Surely, noise is smaller, lasts a long time so it is widely used in the special purpose machine tool in machine-building, low hydraulic in transfer matic etc. In system, but its structure is complex, and oil absorption is not so good, also more sensitive to the pollution of oil liquid;, the improved high pressure leaf of structure Piece pumps maximum operating pressure up to 16.0~21.0Mpa.Vane pump forms stator tool by rotor, stator, blade and end cap etc. There is cylindrical form interior surface, have eccentricity blade in rotor slot between stator and rotor, and can slide in slot, when rotor returns When turning, due to the effect of centrifugal force, blade is made to abut against stator inner wall, in this way in stator, rotor, between blade and two sides oil distribution casing With regard to forming the working space of several sealings, when rotor revolution, blade gradually stretches, and interlobate working space gradually changes Become, vane pump is in rotor each rotation, and each working space completes an oil suction and pressure oil, because of referred to herein as single acting vane pump Rotor ceaselessly rotates, and pumps just constantly oil suction and oil extraction.
Feature: operating pressure is higher, pulses small, noise is smaller, lasts a long time.
Disadvantage: revolving speed is lower, and flow is medium.
Common gear pump: the concept of gear pump is very simply that is, its most basic form is exactly that two sizes are identical Gear is intermeshed rotation in a close-fitting shell, and similar to the figure of eight, two gears are mounted in for the inside of this shell The inside, the outer diameter of gear and two sides and shell are fitted close.Most basic form is exactly that the identical gear of two sizes is tight at one Intermeshing rotation in leakproof fit shell, the inside of this shell is similar to the figure of eight, and two gears are mounted in the inside, gear Outer diameter and two sides and shell are fitted close.Material from extruder enters among two gears in suction inlet, and is full of this One space is finally discharged in two tooth engagements as the rotation of tooth is moved along shell.
Feature: operating pressure is more medium, pulses larger, lasts a long time, revolving speed is higher.
Disadvantage: pulsation is larger, and flow is smaller.
Crescent gear pump (impeller pump): crescent gear pump has many advantages, compact-sized, small in size, and part is few, turns Speed may be up to 10000r/mim, and movement is steady, and noise is low, volumetric efficiency compared with high equal the disadvantage is that flow pulsation is big, the manufacture of rotor Complex process etc. has used powder metallurgy pressing molding with the development of industrial technology at present, and the application of cycloid gear pump will More and more extensive crescent gear pump can be inverted just, can be as hydraulic motor
Feature: working speed is lower, pulses small, noise is smaller, and revolving speed is higher.
Disadvantage: flow is medium, the service life is general.
Piston pump: piston pump be suitable for high pressure, the occasion of small flow, especially flow less than 100 meters 3/ hour, discharge pressure When power is greater than 9.8 megapascal, its higher efficiency and good runnability are more shown.Its intake performance is good, can aspirate various The liquid of different medium, different viscosities.Therefore, raw in petro chemical industry, machine building industry, papermaking, food processing, medicine Produce etc. application is very wide.Low-medium speed piston pump speed is low, can be dragged with manual operation and animal power, is suitable for rural water supply and small Type is irrigated.Flow Q=0.71~6000 meter of piston pump 3/ hour, the megapascal of discharge pressure P2≤39.2, in most cases P2 ≤ 24.5 megapascal.
Feature: operating pressure is very high, pulses smaller, lasts a long time.
Disadvantage: flow is big, and revolving speed is medium, and volume is big, and noise is larger.
[summary of the invention]
Merge gerotor pump and motor;The main body of the structure be by: fusion rotor (1), structural cavity body (2), thrust bullet Reed (3) or axial limiting construction and gear piece (4) or the composition such as body slide assemblies or the non-circular pulley assembly of dead axle;Merge rotor (1) be mounted among structural cavity body (2) as pivoting part, and with the inner surface of structural cavity body (2) be fitted close or It is clearance fit relationship, when tight fit needs thrust spring piece (3), and the function of thrust spring piece (3) is to maintain itself and structure The inner surface of cavity (2) is to be fitted close;Axial limiting is needed to construct when clearance fit, axial limiting construction uses: card Spring, baffle or rolling bearing;The latent structure of fusion rotor (1) is at least 2 conduits, and the head and the tail of conduit (6) are moved towards in circle On the direction in week, axial position diverges to a certain distance;And the head and the tail of conduit (6) have section to merge the coincidence angular area successively decreased (distribution angle range: maximum situation is rough to be greater than half of circumference, and 2 respectively account for half of circumference at this time, full of whole in angle A circumference forms the angular regions of 2 overlappings);Gear piece (4) or body slide assemblies or the non-circular pulley assembly of dead axle are mounted on object On the input port of material and delivery outlet, the tooth tip portion touching of gear piece (4) or body slide assemblies or the non-circular pulley assembly of dead axle, which is closed, is melting It closes on rotor (1) surface in the groove of conduit;The elastic force deformation direction of the teeth portion of gear piece is merged with what the teeth portion of gear piece was touched Rotor (1) normal to a surface direction is identical or opposite;The tooth tip portion of gear piece in this way coincideing with conduit will be with merging rotor (1) Rotation and contact slide in the channel, jump out conduit with the termination of conduit, slide into the sideway stance of fusion rotor slotless, In cycles;When working as hydraulic pump body, be mounted on material input gear piece (4) body slide assemblies or dead axle it is non- Round and smooth wheel assembly will play the role of extruded material;When being slided into conduit due to tooth tip portion, meet when in rotation direction so that tooth When tip is more leaned on against wall (5), tooth tip portion has the function of sealing conduit and the material in conduit is released conduit, generates pump Body discharge, empty the conduit of material by with structural cavity body inner wall form vacuum space, the conduit spatial rotational of portion's vacuum arrives Material is filled after material input again;When working as hydraulic motor, needs to be equipped with pressure relief valve and (pressure releasing structure: transporting The gear piece (4) or body slide assemblies of row low-pressure area are nearby or the inner surface of the structural cavity body (2) of the non-circular pulley assembly of dead axle adds Work has and has unidirectionally by the relief hole of effect, and one-way cock guarantees that liquid will not flow back into the low-pressure area), otherwise hydraulic motor It will not start;The pressure of (highly pressurised liquid) material will make tooth tip portion more lean on against wall (5) so that tooth tip portion bears pressure When;Material pressure acts on channel ends surface, generates rotating torque
When the rotation direction of fusion rotor (1) makes, when rotation direction no longer meets tooth tip portion by against wall (5), Gear piece (4) or body slide assemblies etc. will lose sealing function;Material is flowed out by eduction valve or is circumferentially washed open (due to band It is flexible) tooth tip portion outflow
With the technical characteristic of the difference of other technologies: being fixed on the gear piece (4) or body slide assemblies in structural cavity body Tooth tip portion or the non-circular pulley of dead axle slide into fusion rotor conduit, and the fusion of the coincidence angular area of conduit, which is successively decreased, to be referred to: conduit Sectional area be overlapped angular area linear decrease until to zero, the depth of slot is also just gradually decremented to zero;Axial limiting construction makes It is: circlip, baffle or rolling bearing;The quantity that slot merges rotor road is even number, at least needs 4 conduits;Material is defeated It can be 1 pair on entrance and delivery outlet and be also possible to 2, to 3 pairs or multipair
Axial limiting construction: this is a routine techniques, it is intended that prevents the axial displacement of rotor
The shape for merging the external surface work face of rotor (1) may is that structure described in for being also possible to cylinder of the conical surface The inner surface of cavity (2) is to be fitted close either clearance fit relationship, is referred to: structural cavity body, the inner surface for merging rotor are When cone match, gap can carry out axially opposing displacement to adjust, and wear or make using that can compensate for from thrust spring It is constructed with axial limiting, obtains long-term close surface engagement state;Or the inner surface of structural cavity body, fusion rotor is cylinder cooperation When, it can only axial limiting construction.
Section fusion, which is successively decreased, to be referred to: the sectional area of conduit is being overlapped angular area linear decrease until to zero, that is, slot Being overlapped angular area, gradually linear decrease is zero to the depth in road;Contact point works at the same time in pairs at this time, a linear increase of area, One linear reduction of area, just plus just compensation is reduced;This is related to the output uniformity of discharge capacity or torque;Computationally, nothing By discharge capacity or torque, it is all proportional to the sum of the area that any one time falls into conduit surface gear piece below;Due in mistake (2 slotted vanes while falling into conduit during) fall into the area of conduit surface gear piece below during crossing, and one is linearly to pass Subtract, the other is linear increment;The sum of their area remains unchanged;Thus theoretically obtain absolute linear convergent rate; It is peerless that this is compiled in appearance technology in volume class!
The shape in conduit section: can be trapezoidal, rectangle, arc, narrow wide shape under being most preferably, when with when and tooth When the contact point of narrow wide shape is slidably matched under piece (4) or body slide assemblies or the non-circular pulley assembly of dead axle, have certainly Own compensating action, abrasion do not influence fit clearance, the influence very little to sealing.
The pump and vane pump slightly have similarity;But it is essentially different: must after the moving component abrasion of vane pump Leakage is so generated, and this technology does not have then, since faying face is without edge face structure so that the abrasion of gear piece will not generate gap, Abrasion is equivalent to adjustment
In addition this technology is easy to accomplish atomic discharge capacity;Splendid sealing characteristics
* the module diagnostic of critical seal is realized:
Gear piece: being the integrated elastic structural body that elastic displacement is realized by shape.
Body slide assemblies: be to rely on sliding rail or ramp member constraint and simultaneously use spring, the contact Lai Shixian with melt Close dynamic Contact under the displacement of rotor (1).
The non-circular pulley assembly of dead axle: being that not only can also only be made using sliding rail or slideway or spring driving fixed pulley With the rotation of the dead axle or moving axis of non-circular pulley, the contact Lai Shixian and dynamic Contact under the displacement for merging rotor (1).
[Detailed description of the invention]
Fig. 1 gear piece merges cylinder gerotor pump schematic illustration.
Fig. 2 gear piece merges conical surface gerotor pump schematic illustration.
Attached drawing mark:
(1) rotor is merged
(2) structural cavity body
(3) thrust spring piece
(4) gear piece
(5) wall is leaned on
(6) fixed screw
(7) material input
(8) material outlet
(9) material of vacuum suck
(10) material being discharged
(11) shaft
(12) 2 same peripheral channels
(13) another 2 same peripheral channels
(14) unidirectional relief valve
(15) pressure release duct
(20) conduit intersection
(21) material input shape
(22) material outlet shape
(41) gear piece
[case study on implementation]
Below in conjunction with attached drawing, with regard to preferred embodiment, the invention will be further described:
As shown in Figure 1:
Left side figure in figure is the detailed diagram for merging rotor (1) and being moved;Share 4 conduits: 2 same peripheral channels (12) and another 2 same peripheral channels (13);The length of each conduit is slightly larger than 1/8 circumference arc;That is: 45 degree;Each other thus There are one, conduit intersection (20) is overlapped angle about 10-20 degree
Right side figure in figure be along fusion rotor (1) shaft (11) direction viewing entire oil pump perspective view, 4 A conduit distribution perspective viewing conduit intersection (20) is high-visible: 2 same peripheral channels (12) and another 2 same peripheral channels (13) all respective Relative distribution (180 degree);The central point of each conduit accompanies 90 degree of angle, just can ensure that so entire Circumference can be filled up by conduit, and the overlapping region as having 4
The gear piece of gear piece (41) and Fig. 2 are fixed screw (6) and are fastened on structural cavity body (2), and component is essentially identical (in detail See that Fig. 2 illustrates), the back by wall (5) and gear piece (41) is in close contact;Guarantee to seal conduit!
(7), (8) are respectively as follows: material input and material outlet;(9) be vacuum suck material;It is expressed in figure are as follows: The material moment of vacuum suck;(10) it expresses are as follows: under the material moment actual conditions of discharge, material is filled with entire inlet and outlet Space, the action principle of input and output material is expressed in figure for convenience, is not drawn into and.
When using as hydraulic motor: unidirectional relief valve (13) will play a role: within the short time that motor starts, slot Road moment cannot reach perfect vacuum, return back out existing conduit pocketed oil phenomenon, can not generate complete torque, and starting will be unable to carry out.It lets out Press duct (14) can lead to outside low pressure oil region or discharge machine.
(21) mouth-shaped is inputted for circular material;(22) it is rectangular material outlet shape, enters from the Kong Wang;Only may be used It is right in the case where merging rotor (1) any location status since every section of conduit only has 1/8 circumference arc or so to see all conduits It is all sealing for oil pressure input.(22) rectangular material outlet shape is conducive to that gear piece (41) are fixedly mounted,
Due to contact slide region sealing, need 1 piece of plane by wall, it is also very square that gear piece (41) are fixedly mounted Just.
By the rotation direction of arrow in figure, due to the effect of surface traction, in figure the gear piece (41) of top with merge turn Sub (1) keeps surface contact, and a contact forms the vacuum state of that section of conduit on the right (by 3 face institutes in the bottom of conduit The closed space in besieged city: the inner surface on groove face, the nib contacts portion faces of gear piece (41) and structural cavity body (2));Another The conduit that slipped away contact lateral area on, tip has been passed a distance.
It is as shown in Figure 2:
Completely the same in principle with Fig. 1, difference is that merging rotor (1) is conical surface shape.
It, which is sealed, is different from Fig. 1 situation, rotor (1) is merged under the lifting force of thrust spring piece (3), with structural cavity body (2) inner surface is fitted close, and is sealed fabulous.
The lower right corner is the angle of squint figure of the amplification of gear piece (4), is easy to show its shape and operating mode;In fixed screw (6) it after fastening, tightly leans against on wall (5), and is just aligned on the circumference where 2 groups of conduits;The ring-type of gear piece (4) is curved Song is allowed to be easy to produce the direction displacement along the normal of fusion rotor (1) conical surface;With the rotation of fusion rotor (1), gear piece (4) with merge rotor (1) contact jaw urged against surface slide, after sliding out conduit.
The figure of underface is structural cavity body (2) part drawing under disassembly, and (7), (8) are respectively as follows: material input and material Delivery outlet;Figure is section along the entire oil pump of the direction viewing vertical with shaft (11) of fusion rotor (1) the upper surface of in figure Face figure;It is same as in figure 1;On 2 same peripheral channels (12) and all respective Relative distribution (180 degree) of another 2 same peripheral channels (13).
(21), (22) are respectively circular material input mouth-shaped and material outlet shape, are entered from the Kong Wang;Only may be used It is right in the case where merging rotor (1) any location status since every section of conduit only has 1/8 circumference arc or so to see all conduits It is all sealing for oil pressure input.
The changes of section feature of conduit, is elaborated in [summary of the invention].

Claims (3)

1. merging gerotor pump and motor;The main body of the structure be by: fusion rotor (1), structural cavity body (2), thrust spring Piece (3) and gear piece (4) composition;Fusion rotor (1) is mounted among structural cavity body (2) as pivoting part and and structural cavity body (2) inner surface is to be fitted close either clearance fit relationship, and use respectively: the function of thrust spring piece (3) is to maintain it Inner surface with structural cavity body (2) is fitted close either with clearance fit;The latent structure for merging rotor (1) is at least 1 conduit realizes that the smallest pulsation at least needs 4 conduits;The head and the tail of conduit (6) have section fusion to pass in a circumferential direction The coincidence angular area subtracted,;Gear piece (4) is mounted on the input port and delivery outlet of material, and the tooth tip portion touching of gear piece (4), which is closed, is merging In groove on rotor (1) surface;The elastic force deformation direction of tooth is identical as fusion rotor (1) normal to a surface direction;Such tooth Tip will be slided in the channel with the rotation of fusion rotor (1), jumps out conduit with the termination of conduit, slides into slotless Position, in cycles;As the pump housing work when, when tooth tip portion slides into conduit, rotation direction meet so that tooth tip portion more When adding by against wall (5), tooth tip portion has the function of sealing conduit and the material in conduit is cleared out conduit, generates pump housing row Material;When working as hydraulic motor, the pressure of material will make tooth tip portion more lean on against wall so that tooth tip portion bears pressure (5) when;Material pressure acts on channel ends surface, generates rotating torque, pressure relief valve is necessary at this time;Its feature just exists In: the tooth tip portion for being fixed on the gear piece (4) of structural cavity body contacts in fusion rotor conduit that the fusion of the coincidence angular area of conduit is passed Subtract and refer to: the sectional area of conduit is being overlapped angular area linear decrease until to zero, and the depth of slot is also just gradually decremented to zero;Axis It is used to limit configuration: circlip, baffle or rolling bearing;The quantity that slot merges rotor road is even number, at least needs 4 Conduit;It can be 1 pair on the input port of material and delivery outlet and be also possible to 2, to 3 pairs or 4 pairs or more;Made as obstruction conduit Component is: gear piece.
2. requiring 1 fusion gerotor pump and motor according to benefit, it is characterised in that: the outer surface work of the fusion rotor (1) The shape for making face is: the conical surface or cylinder, and the corresponding structural cavity body of fusion rotor (1) of cylinder needs end cover, cone The corresponding structural cavity body of fusion rotor (1) in face has not needed end cover;The inner surface of structural cavity body (2) be fitted close or Person is clearance fit relationship, is referred to: when structural cavity body, the inner surface for merging rotor are cone match, gap can carry out axial direction Relative displacement is adjusted, and using that can compensate for abrasion from thrust spring or construct using axial limiting, obtains long-term close Surface engagement state;Or structural cavity body, merge rotor inner surface be cylinder cooperation when, axial limit configuration can only be cooperated.
3. merging gerotor pump and motor according to claim 1, it is characterised in that: the shape in the conduit section refers to: Its shape is trapezoidal or rectangle or arc, narrow wide shape under being, when sliding with the contact point of wide shape narrow under gear piece (4) When dynamic cooperation, there is oneself compensating action, abrasion does not influence fit clearance, the influence very little to sealing;In trapezoidal or arc feelings Narrow wide shape under being under condition;The gear piece (4) is with body slide assemblies or the non-circular pulley assembly substitution of dead axle.
CN201610917140.4A 2015-10-25 2016-10-21 Merge gerotor pump and motor Active CN106609753B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN2015106970862 2015-10-25
CN201510697086 2015-10-25

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CN106609753B true CN106609753B (en) 2019-11-05

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108457828B (en) * 2017-12-29 2019-07-30 浙江工业大学 A kind of two-dimentional plunger pump of static pressure slider roller and guide rail transmission
CN110185608A (en) * 2018-02-17 2019-08-30 罗天珍 A kind of dedicated transients extruder of three-dimensional printer
CN110529333A (en) * 2018-05-25 2019-12-03 刘行兵 Hydraulic motor

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* Cited by examiner, † Cited by third party
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JP3100858B2 (en) * 1995-03-01 2000-10-23 株式会社東芝 Spiral measuring device and measuring method, helical blade manufacturing method
CA2344430C (en) * 1998-09-29 2009-02-24 Alexandr Anatolievich Stroganov Rotary machine
RU2175731C1 (en) * 2000-05-23 2001-11-10 Зимников Александр Николаевич Reversible pump
GB0419848D0 (en) * 2004-09-07 2004-10-13 Carbonate Ltd Pumps
US8734140B2 (en) * 2011-01-06 2014-05-27 Gm Global Technology Operations, Llc Reversible gerotor pump

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