CN1904359A - Radial valve orificing axial hydraulic pressure plunger pump - Google Patents
Radial valve orificing axial hydraulic pressure plunger pump Download PDFInfo
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- CN1904359A CN1904359A CN 200610019925 CN200610019925A CN1904359A CN 1904359 A CN1904359 A CN 1904359A CN 200610019925 CN200610019925 CN 200610019925 CN 200610019925 A CN200610019925 A CN 200610019925A CN 1904359 A CN1904359 A CN 1904359A
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Abstract
In the invention, an inclined disk is bound on the mainshaft disk at the bottom of the mainshaft and on the inclined disk are uniformly set piston shoes in the flexible connection with the plunger. The plunger hole uniformly set on the cylinder is fitted with the plunger. On the central shaft of the cylinder are disposed a central spring, a spherical hinge and a return disk the piston shoes are close up to the inclined disk. The back-end cap has a radial water outlet and a radial water inlet and the central hole of the back-end cap is in communication with the water outlet. There is a ring groove around the central hole in communication with the water inlet. The mounting hole on the cylinder is corresponding to each plunger hole and in communication with the cylinder central notch. In the mounting hole is mounted a valve body. The cylinder central notch is in communication with the back-end cap central hole and each mounting hole is in communication with the back-end cap ring groove.
Description
Technical field
The invention belongs to the pump class, be specifically related to a kind of valve orificing axial hydraulic pressure plunger pump.
Background technique
Hydraulic pamp designs and develops it as the core parts of hydraulic transmission system, is the place of the key of development Hydraulic Drive Technology.The structural type of hydraulic pamp commonly used has plunger type, blade type, gear type etc. several in the world at present.Comparatively speaking, the blade of vane pump is line with two gears of stator, gear pump and contacts, and contact PV value is high, and sealing effect is poor; Crucial friction pair in the plunger pump (as plunger/cylinder hole, piston shoes/swash plate, thrust plate/cylinder body end face etc.) mostly is the face contact, PV value under the equal working condition is less relatively, can realize hydrostatic support, and sealing effect is better, be easy to reduce to leak, to guarantee the efficient of pump by the method that increases matching gap length.Therefore, plunger-type structure relatively is suitable for low viscosity medium uses such as seawater, and the national existing hydraulic pamp overwhelming majority such as Britain, the U.S., Germany, Japan, Finland, Denmark have adopted plunger-type structure.
The present various axial water pressure plunger pumps of using, by substantially being divided on its flow mode: three kinds of valve plate distributions, valve flow, axle flow, wherein in the majority with valve plate distribution (thrust plate flow) and valve flow, the axle flow is because matching gap is excessive, water leaks during as working medium easily, so seldom use in hydraulic pamp.
Valve plate distribution formula water pressure plunger pump makes water flow to the zone of high pressure through the flow window on the thrust plate from low pressure area by the motion between cylinder body and the thrust plate, thereby realizes suction, drainage procedure.Make the end fluid-distributing axial sea water hydraulic plunger pump of institute as Japanese Xiao Song (Komatsu) in development in 1991.The plunger of this pump and plunger hole are evenly distributed on the circumference vertically, the to-and-fro motion that is used for realizing plunger by swash plate and central spring, its thrust plate adopts charcoal fibre-reinforced high molecular plastics (CFRP), and the cylinder body end face adopts pottery, and all friction pair is all lubricated with seawater.It is little that this pump has a volume, in light weight, advantages such as specific power is big, noise was bigger when its deficiency was work, and amount of leakage is big when high pressure, volumetric efficiency is lower, and its valve plate distribution pair be a pair ofly be in for a long time at a high speed, the crucial friction pair of heavy duty, very easily wear out failure has brought inconvenience for maintenance and replacing, so this adopts engineering ceramic material to friction pair more, but its processing cost is higher and the difficulty in design and manufacture process is also very big.
Valve orificing axial hydraulic pressure plunger pump then is to open and close independently of one another by suction valve and delivery valve to realize suction and drainage procedure.The valve current allocating type water pressure plunger pump is compared with valve plate distribution formula water pressure plunger pump, its advantage is to have reduced a pair of friction pair (the flow pair between cylinder body and the thrust plate), the difficulty that has so not only reduced design and made, and the structural type of the flow-distributing valve (cone valve, ball valve and flap type are arranged) that increases also has excellent sealing performance, can work under higher pressure state.The axial arranged form of the many employings of existing valve current allocating type water pressure plunger pump, the Central China University of Science and Technology is China's first Taiwan Straits water hydraulic pump in the axial sea water plunger pump for the deep submergence rescue vehicle development in 1996.The plunger of this pump and plunger hole be circle distribution vertically, and suction valve and delivery valve all are arranged in the below of plunger hole vertically, and realizes the to-and-fro motion of plunger by the effect that is installed in retracting spring in each plunger and swash plate.The working pressure of this sea water hydraulic pump and volumetric efficiency are all higher, and it is also comparatively steady to work, and now has been successfully applied on certain salvage boat.But because its flow-distributing valve (suction valve and delivery valve) axial arranged causes its structure comparatively complicated, volume ratio wants big with other pump class of flow, and maintenance and to change the accessory of valve body also extremely difficult.
Summary of the invention
The invention provides a kind of radial valve orificing axial hydraulic pressure plunger pump, the structural type that this hydraulic pamp adopts oil-water separation, flow valve body radially to arrange, solve high-pressure water pump and select the difficult problem of bearing, reduce volume simultaneously, be applicable to the workplace of high pressure, big flow.
A kind of radial valve orificing axial hydraulic pressure plunger pump of the present invention, comprise the pump housing, cylinder body and the rear end cover that are linked in sequence, main shaft by Bearing Installation on the pump housing, the main shaft lower end is the main shaft disk that becomes certain inclination angle with it, swash plate by and ball bearing between interference fit be fitted on the main shaft disk, evenly be provided with the piston shoes that flexibly connect with plunger on the distribution circle of swash plate; Evenly be furnished with on the distribution circle of cylinder body and the same number of plunger hole of plunger, wherein embed plunger bushing, plunger and plunger bushing are slidingly matched; The ball pivot that the middle axle position setting of cylinder body is withstood by central spring, ball pivot interlocking backhaul dish, piston shoes are close on the swash plate by the effect of backhaul dish; It is characterized in that: (1) rear end cover has water outlet and water inlet radially, and the rear end cover center hole is communicated with water outlet, around the circular groove of center hole for being connected with water inlet; (2) the cylinder body circumference radially evenly has mounting hole, and is corresponding with each plunger hole, and is communicated to inferior part of the cylinder block center shrinkage pool; In the mounting hole each plunger hole under a flow valve body respectively is installed; (3) inferior part of the cylinder block center shrinkage pool is communicated with the rear end cover center hole, and each mounting hole of cylinder body is communicated with the circular groove of rear end cover.
Described radial valve orificing axial hydraulic pressure plunger pump, it is characterized in that: described flow valve body comprises flow-distributing valve nut and the suction valve and the delivery valve that connect by middle cover, middle cover constitutes public cavity volume, and the bottom that this cavity volume has flow valve port and cylinder body upper prop consent communicates; Suction valve comprises suction valve valve body, suction valve spool and suction valve valve seat, suction valve valve body one end is connected with the suction valve valve seat, the suction valve spool that is with inhalation valve spring is contained on the suction valve valve seat, and suction valve valve body two side has suction valve water inlet and suction valve valve port; Delivery valve comprises delivery valve valve seat, delivery valve spool and delivery valve guide pin bushing, and delivery valve valve seat one end has the delivery valve water inlet, and the other end is delivery valve guide pin bushing and have the delivery valve water outlet fixedly, and the delivery valve spool that is with the delivery valve spring is contained on the delivery valve guide pin bushing; Circular groove on suction valve water inlet and the rear end cover communicates, and the center shrinkage pool osculum on delivery valve water outlet and the cylinder body communicates; Flow-distributing valve nut and described mounting hole screw thread or flange cooperate, and suction valve and delivery valve are fixed in the mounting hole.
Described radial valve orificing axial hydraulic pressure plunger pump, it is further characterized in that: corresponding each suction valve valve port has the diversion passage vertically on the described cylinder body, is communicated to the rubbing surface place of plunger and plunger bushing.
The technology of the present invention characteristics are as follows:
(1) structural type of employing oil-water separation, it is good and be applicable to that the rubber and plastic combination seal of water lubrication medium realizes this structure that utilization is installed in wear resistance on the plunger bushing, this all uses oily medium lubricated to operating conditions abominable friction pair and all rolling bearings to make piston shoes-swash plate, has avoided high-pressure water pump to select the difficult problem of bearing.
(2) adopt valve distributing construction form, suction valve and delivery valve are made a flow valve body, the number of flow valve body is identical with the plunger number, and radially arranges, has not only reduced the physical dimension of the whole pump housing, it is heavy to have alleviated pump, and when spare parts such as replacing flow spool and spring, needn't dismantle the whole pump housing, a nut that only needs to open each flow-distributing valve at the circumferencial direction of pump carries out integral replacing, improve the maintainalbility of pump, shortened engineering time.
(3) the flow valve body adopts the flap type structure, and spool adopts the 17-4PH Precipitation-hardening Stainless Steel, and valve seat adopts import engineering plastics TX, and spring adopts the 3J1 Stainless Steel Wire.Its good seal performance, response is fast, and has characteristics such as impact is little, noise is low, can reach higher volumetric efficiency.
(4) adopt the supporting of three row cylindrical roller thrust bearings before and after the transmission main shaft swash plate, the thrust-bearing internal diameter embeds rolling bearing, has increased the rigidity of swash plate like this, and simultaneously, the relative movement between piston shoes and swash plate is almost nil, and promptly the piston shoes friction pair bear the PV value hardly.
(5) plunger and plunger bushing adopt the soft or hard pairing, and plunger adopts Martensitic Stain Less Steel heat treatment to improve hardness as far as possible with the increase wear resistance, and with the sealing of rubber and plastic combination seal, has reduced the leakage of pump effectively, has improved volumetric efficiency.
(6) structure of employing central spring-piston shoes is pushed against plunger group (comprising plunger and piston shoes) on the swash plate by the backhaul dish.Avoided like this adding the defective that a return spring fatigue failure is caused on each plunger in the point contact junction structure.
(7) each suction valve valve port is all opened the rubbing surface place of a long and narrow diversion passage to plunger and plunger bushing.Water just can be guided to rubbing surface by sucking the valve port passage of flowing through like this, not only reduced the fretting wear between plunger and the plunger bushing, and flow into the effect that the aqueous medium of rubbing surface can also cooling liquid from passage, reduce because the temperature rise between caused plunger of plunger to-and-fro motion and plunger bushing.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is a flow valve body modular construction schematic representation of the present invention;
Fig. 3 is a suction valve structure schematic representation of the present invention;
Fig. 4 is a delivery valve structural representation of the present invention.
Embodiment
With reference to Fig. 1～Fig. 4, the label among the figure is: rear end cover 1, water outlet 2, circular groove 3, flow valve body 4, plunger 5, plunger hole 6, diversion passage 7, rubbing surface 8, deep groove ball bearing 9, spring seat 10, rubber and plastic combination seal 11, plunger bushing 12, housing screw 13, piston shoes 14, swash plate 15, main shaft disk 16, thrust bearing 17, angular contact ball bearing 18, front cover screw 19, main shaft 20, oil seal washer 21, front cover 22, positioning hole 23, the pump housing 24, ball bearing 25, backhaul dish 26, ball pivot 27, platen 28, plug screw 29, central spring 30, positioning screwn 31, sewage draining exit 32, plug 33, cylinder body 34, center shrinkage pool osculum 35, screw hole 36, water inlet 37, flow-distributing valve nut 38, suction valve valve port 39, suction valve 40, flow valve port 41, delivery valve 42, middle cover 43, suction valve water intake 44, inhalation valve spring 45, suction valve spool 46, suction valve valve seat 47, inhalation valve spring pad 48, suction valve valve body 49, delivery valve valve seat 50, delivery valve spool 51, delivery valve spring 52, delivery valve water outlet 53, delivery valve guide pin bushing 54.
Uniform vertically 7 plunger holes 6 in the cylinder body 34 of the present invention all are inlaid with stainless metal column plug sleeve 12 in each plunger hole 6, be pressed into the engineering plastics cover in the inwall of plunger bushing, with guarantee its with plunger 5 cooperate and lubricated.Processing becomes the main shaft disk 16 at certain inclination angle with it on main shaft 20, swash plate 15 by be close to cooperating of ball bearing 25 on the main shaft disk 16, the cylinder body 34 and the pump housing 24 link together by positioning screwn 31,1 of rear end cover and cylinder body 34 are affixed.
Flow valve body 4 is formed one by suction valve 40 and delivery valve 42, its number is identical with the plunger number and radially be distributed in the bottom of cylinder body 34, suction valve 40 is connected by middle cover 43 with delivery valve 42, middle cover 43 constitutes public cavity volume, the bottom that this cavity volume has flow valve port 41 and plunger hole 6 communicates, circular groove 3 on suction valve water inlet 44 and the rear end cover 1 communicates, and the center shrinkage pool osculum 35 on delivery valve water outlet 53 and the cylinder body 34 communicates.
Can all open the rubbing surface 8 of a long and narrow diversion passage 7 from each suction valve valve port 39 to plunger 5 and plunger bushing 12.When plunger is in the suction state, water just can be guided to rubbing surface 8 by the suction valve valve port 39 diversion passage 7 of flowing through, so not only can reduce the friction between plunger 5 and the plunger bushing 12, promptly become liquid friction by dry friction, and flow into the effect that the aqueous medium of rubbing surface 8 can also cooling liquid from diversion passage 7, reduce because the temperature rise of caused plunger 5 of plunger to-and-fro motion and plunger bushing 12.
This pump adopts the structural type of oil-water separation, and the oil-water separation of oil pocket and water cavity is good and be applicable to that the rubber and plastic combination seal 11 that aqueous medium lubricates realizes by being installed in wear resistance on the plunger bushing in the pump.The rubber and plastic combination seal of oil-water separation on the plunger bushing is to be combined by the filled polytetrafluoroethylene PTFE of a pair of low friction ring and O shape rubber seal, and plunger does not contact with plunger hole, and the guided bearing ring is not only made friction pair material (PTFE) but also born lateral force; The friction pair of these relative movement such as its thrust bearing 17, ball bearing 25, main shaft disk 16 and angular contact ball bearing 18 and plunger 5 heads, swash plate 15 lubricates by lubricant oil.
The working procedure of this radial valve orificing axial hydraulic pressure plunger pump is as described below: when main shaft 20 clockwise drive swash plates 15 together rotate, central spring 30 is uniformly applied to active force on each piston shoes 14 by ball pivot 27 and backhaul dish 26, piston shoes 14 are close on the swash plate 15 all the time to slide, simultaneously the swash plate 15 that rotated of plunger 5 is given the active force of piston shoes 14 and reciprocating in the plunger bushing 12 in being embedded in the cylinder hole, 34 transfixions of cylinder body.When swash plate 15 along clockwise direction limes superiors position (You Bian swash plate positions as shown in Figure 1) when motion, delivery valve spool 51 in the flow valve body 4 all is in closed condition, piston shoes 14 drive plunger 5 and move upward under the impacting force effect of backhaul dish 26, enclosed volume in plunger hole 6 chambeies increases simultaneously, water pressure reduces, when the hydraulic pressure in the vestibule drops to a certain numerical value, in the flow valve body 4 suction valve spool 46 can because of the hydraulic pressure at water inlet 37 places greater than hydraulic pressure in the plunger vestibule and inhalation valve spring 45 active forces make a concerted effort be unlocked, water is entered in the suction valve water intake 44 plunger vestibule that feed pressure is low again by water inlet 37, realizes water absorption course; When swash plate 15 downward limit positions (swash plate positions on the left side as shown in Figure 1) move, plunger 5 is moved downward by the active force of swash plate 15, the volume of plunger vestibule can reduce gradually simultaneously, the water pressure of the Sheng Gaoing spring force of gathering inhalation valve spring 45 in the flow valve body 4 on the one hand cuts out suction valve spool 46 gradually, overcome the active force of delivery valve spring 52 in the flow valve body 4 on the other hand and pump making a concerted effort of the mouth of a river 2 pressure, delivery valve spool 51 is opened, make the high pressure water in the plunger vestibule flow into water outlet 2 discharges, realize the setting-out process through delivery valve water outlet 53.Rotate a circle when main shaft 20 drives swash plates 15, each plunger 5 each suction, setting-out once, along with the continuous rotation of main shaft 20, each plunger 5 is also independently finished the action of suction, setting-out continuously, thereby makes the water pressure plunger pump proper functioning.
Claims (3)
1, a kind of radial valve orificing axial hydraulic pressure plunger pump, comprise the pump housing, cylinder body and the rear end cover that are linked in sequence, main shaft by Bearing Installation on the pump housing, the main shaft lower end is the main shaft disk that becomes certain inclination angle with it, swash plate by and ball bearing between interference fit be fitted on the main shaft disk, evenly be provided with the piston shoes that flexibly connect with plunger on the distribution circle of swash plate; Evenly be furnished with on the distribution circle of cylinder body and the same number of plunger hole of plunger, wherein embed plunger bushing, plunger and plunger bushing are slidingly matched; The ball pivot that the middle axle position setting of cylinder body is withstood by central spring, ball pivot interlocking backhaul dish, piston shoes are close on the swash plate by the effect of backhaul dish; It is characterized in that (1) rear end cover has water outlet and water inlet radially, the rear end cover center hole is communicated with water outlet, around the circular groove of center hole for being connected with water inlet; (2) the cylinder body circumference radially evenly has mounting hole, and is corresponding with each plunger hole, and is communicated to inferior part of the cylinder block center shrinkage pool; In the mounting hole each plunger hole under a flow valve body respectively is installed; (3) inferior part of the cylinder block center shrinkage pool is communicated with the rear end cover center hole, and each mounting hole of cylinder body is communicated with the circular groove of rear end cover.
2, radial valve orificing axial hydraulic pressure plunger pump as claimed in claim 1, it is characterized in that: described flow valve body comprises flow-distributing valve nut and the suction valve and the delivery valve that connect by middle cover, middle cover constitutes public cavity volume, and the bottom that this cavity volume has flow valve port and cylinder body upper prop consent communicates; Suction valve comprises suction valve valve body, suction valve spool and suction valve valve seat, suction valve valve body one end is connected with the suction valve valve seat, the suction valve spool that is with inhalation valve spring is contained on the suction valve valve seat, and suction valve valve body two side has suction valve water inlet and suction valve valve port; Delivery valve comprises delivery valve valve seat, delivery valve spool and delivery valve guide pin bushing, and delivery valve valve seat one end has the delivery valve water inlet, and the other end is delivery valve guide pin bushing and have the delivery valve water outlet fixedly, and the delivery valve spool that is with the delivery valve spring is contained on the delivery valve guide pin bushing; Circular groove on suction valve water inlet and the rear end cover communicates, and the center shrinkage pool osculum on delivery valve water outlet and the cylinder body communicates; Flow-distributing valve nut and described mounting hole screw thread or flange cooperate, and suction valve and delivery valve are fixed in the mounting hole.
3, radial valve orificing axial hydraulic pressure plunger pump as claimed in claim 2 is characterized in that: corresponding each suction valve valve port has the diversion passage vertically on the described cylinder body, is communicated to the rubbing surface place of plunger and plunger bushing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100199256A CN100394023C (en) | 2006-08-07 | 2006-08-07 | Radial valve orificing axial hydraulic pressure plunger pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100199256A CN100394023C (en) | 2006-08-07 | 2006-08-07 | Radial valve orificing axial hydraulic pressure plunger pump |
Publications (2)
| Publication Number | Publication Date |
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| CN1904359A true CN1904359A (en) | 2007-01-31 |
| CN100394023C CN100394023C (en) | 2008-06-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2006100199256A Expired - Fee Related CN100394023C (en) | 2006-08-07 | 2006-08-07 | Radial valve orificing axial hydraulic pressure plunger pump |
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| CN101832243A (en) * | 2010-04-30 | 2010-09-15 | 北京工业大学 | Axial water pressure plunger pump with easy maintenance |
| CN101949374A (en) * | 2010-09-03 | 2011-01-19 | 北京工业大学 | Swash plate type valve distributing high-pressure pure water plunger pump |
| CN101956688A (en) * | 2010-09-21 | 2011-01-26 | 华中科技大学 | Self water-replenishing flat valve plunger type extra-high pressure water pump |
| CN101956684A (en) * | 2010-09-21 | 2011-01-26 | 华中科技大学 | Plunger type water pump |
| CN101956685A (en) * | 2010-09-21 | 2011-01-26 | 华中科技大学 | Fully water-lubricated super-pressure plunger water pump |
| CN102094979A (en) * | 2011-02-28 | 2011-06-15 | 北京工业大学 | Integrated water hydraulic distributing valve |
| CN102305203A (en) * | 2011-08-16 | 2012-01-04 | 北京工业大学 | Linear motor-driven plunger pump |
| WO2012037738A1 (en) * | 2010-09-21 | 2012-03-29 | 华中科技大学 | Plunger water pump |
| CN102734109A (en) * | 2012-05-29 | 2012-10-17 | 武汉华喜特种液压设备有限公司 | Fully water-lubricated valve distribution plunger pump |
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| CN107477199A (en) * | 2017-09-21 | 2017-12-15 | 方乐 | One kind extrudes valve module |
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| CN114060245A (en) * | 2021-12-09 | 2022-02-18 | 华中科技大学 | Fixed clearance return type high-pressure plunger water pump |
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| US4776260A (en) * | 1980-11-07 | 1988-10-11 | Vincze Alexander L | Constant pressure pump |
| CN2221111Y (en) * | 1995-01-05 | 1996-02-28 | 韦炳文 | Valve flow-metering high pressure axial plunger pump |
| JP3576245B2 (en) * | 1995-02-20 | 2004-10-13 | 株式会社フジキン | Plunger pump |
| CN2344578Y (en) * | 1998-08-13 | 1999-10-20 | 徐绳武 | Double-fork swashplate axial piston pump |
| CN200949507Y (en) * | 2006-08-07 | 2007-09-19 | 华中科技大学 | Radial valve flow distribution axial water pressure plunger pump |
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| CN101832243A (en) * | 2010-04-30 | 2010-09-15 | 北京工业大学 | Axial water pressure plunger pump with easy maintenance |
| CN101949374A (en) * | 2010-09-03 | 2011-01-19 | 北京工业大学 | Swash plate type valve distributing high-pressure pure water plunger pump |
| WO2012037738A1 (en) * | 2010-09-21 | 2012-03-29 | 华中科技大学 | Plunger water pump |
| CN101956688A (en) * | 2010-09-21 | 2011-01-26 | 华中科技大学 | Self water-replenishing flat valve plunger type extra-high pressure water pump |
| CN101956684A (en) * | 2010-09-21 | 2011-01-26 | 华中科技大学 | Plunger type water pump |
| CN101956685A (en) * | 2010-09-21 | 2011-01-26 | 华中科技大学 | Fully water-lubricated super-pressure plunger water pump |
| CN101956688B (en) * | 2010-09-21 | 2012-07-04 | 华中科技大学 | Self water-replenishing flat valve plunger type extra-high pressure water pump |
| CN102094979B (en) * | 2011-02-28 | 2012-10-24 | 北京工业大学 | Integrated water hydraulic distributing valve |
| CN102094979A (en) * | 2011-02-28 | 2011-06-15 | 北京工业大学 | Integrated water hydraulic distributing valve |
| CN102305203A (en) * | 2011-08-16 | 2012-01-04 | 北京工业大学 | Linear motor-driven plunger pump |
| CN102305203B (en) * | 2011-08-16 | 2014-04-09 | 北京工业大学 | Linear motor-driven plunger pump |
| CN102734109B (en) * | 2012-05-29 | 2015-05-20 | 武汉华喜特种液压设备有限公司 | Fully water-lubricated valve distribution plunger pump |
| CN102734109A (en) * | 2012-05-29 | 2012-10-17 | 武汉华喜特种液压设备有限公司 | Fully water-lubricated valve distribution plunger pump |
| CN103629106B (en) * | 2013-12-20 | 2016-01-13 | 青岛大学 | A kind of reciprocating pump pivoted housing formula circumference flow distribution apparatus |
| CN103629106A (en) * | 2013-12-20 | 2014-03-12 | 青岛大学 | Rotating sleeve type circumferential distribution device for reciprocating plunger pump |
| CN107477199A (en) * | 2017-09-21 | 2017-12-15 | 方乐 | One kind extrudes valve module |
| CN108953544A (en) * | 2018-09-11 | 2018-12-07 | 无锡威孚精密机械制造有限责任公司 | A kind of hydrostatic stepless speed change device |
| CN108953544B (en) * | 2018-09-11 | 2024-02-27 | 无锡威孚精密机械制造有限责任公司 | Hydrostatic stepless speed change device |
| CN111089752A (en) * | 2019-12-28 | 2020-05-01 | 贾涛 | Deep water stratified sampling device |
| CN114060245A (en) * | 2021-12-09 | 2022-02-18 | 华中科技大学 | Fixed clearance return type high-pressure plunger water pump |
| CN114060245B (en) * | 2021-12-09 | 2024-04-05 | 华中科技大学 | Fixed-clearance return-stroke type high-pressure plunger water pump |
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