CN104948409A - Quantified and axial plunger pump - Google Patents

Quantified and axial plunger pump Download PDF

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Publication number
CN104948409A
CN104948409A CN201510377346.8A CN201510377346A CN104948409A CN 104948409 A CN104948409 A CN 104948409A CN 201510377346 A CN201510377346 A CN 201510377346A CN 104948409 A CN104948409 A CN 104948409A
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flow
pump
cylinder
transmission shaft
pintle
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CN104948409B (en
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张坚
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Hunan Liwei Hydraulic Equipment Co., Ltd.
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张坚
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Abstract

The invention provides a quantified and axial plunger pump. The plunger pump is a radial flow distribution pump and comprises a transmission shaft, a cylinder, a flow distribution sleeve, a flow distribution shaft and an inclined disc, wherein the transmission shaft is driven by external force to rotate, the cylinder, the flow distribution sleeve and the flow distribution shaft are connected with the transmission shaft, and the inclined disc enables the plunger pump to output fluid in a quantified mode. The cylinder, the flow distribution sleeve, the flow distribution shaft and the transmission shaft are coaxially arranged. Compared with a traditional radial plunger pump, the plunger pump has the main advantages of being simple in structure, small in size and light in weight; compared with a traditional axial plunger pump, the plunger pump has the main advantages that the rotation speed of the pump can be substantially increased, working pressure can be substantially increased, the nominal flow rate can be multiplied, or at equal working pressure, the volume efficiency of the pump is remarkably improved, and noise can be lowered by more than10 db.

Description

A kind of quantitatively axial piston pump
Technical field
The present invention relates to plunger pump field, especially, relate to a kind of quantitatively axial piston pump.
Background technique
Plunger pump relies on plunger to-and-fro motion in cylinder body, makes the spatial volume of Seal cage change to realize the pump of oil suction or oil extraction.In prior art, multiplunger plunger pump mainly contains two kinds, and one is axial piston pump, and another kind is radial plunger pump.
Wherein, radial plunger pump refers to that plunger radial arrangement is installed in the rotor, and rotor is rotated by driven by motor together with plunger.Plunger is closely against the inwall of stator by the effect of centrifugal force and the fluid effect of low pressure and mass flow gear pump supply.Its structure as shown in Figure 4, wherein, 01, plunger, 02, rotor, 03, lining, 04, stator, 05, oil distributing shaft.When rotor left avertence do clockwise direction rotate time, owing to having eccentric distance e between stators and rotators, therefore, protruding gradually during plunger pile warp upper half, in-oil cylinder spatial volume is changed from small to big, forming section vacuum and oil suction; When plunger forwards lower half to, plunger pushes away by stator inner wall inward, the oil extraction from large to small of in-oil cylinder spatial volume.Rotor often circles, and each plunger respectively completes an oil suction and an oil extraction, if rotor ceaselessly rotates continuously, oil pump just can constantly complete oil transportation work.Change the flow that described eccentric distance e can change oil pump.Change eccentric direction, the direction of oil transportation can be changed.Radial plunger pump has flow large (50 ~ 400L/min) and flow is adjustable, it is variable to flow to, working pressure is high (6.3 ~ 40MPa), and the feature such as operate steadily.But radial pump is assembled by more than 30 component such as the left and right oil cylinder of transmission shaft, stator, rotor, large discharge gear pump, plunger pump, servovalve, solenoid valve, back pressure valve, safety valve and plunger pump and housings, its complex structure, manufacture difficulty is large, and volume is large and heavy; Therefore be mostly used in the large heavy machinery hydraulic equipment of the low speed that Maximum operating pressure is about 10 ~ 20MPa, high-power (20 ~ 150kw).In addition, epitrochanterian plunger presses closer stator inner wall by the rotary centrifugal force effect of rotor and the oil pressure effect of gear pump supply, changes the spatial volume in each hole of cylinder body, reaches the object sucking medium and discharge medium; It is large to there is friction factor in this, the defects such as working medium is single.
And the axial piston pump plunger pump that to be the vibration-direction of piston or plunger parallel with cylinder body central shaft.The volume-variation that axial piston pump utilizes plunger plunger hole in the to-and-fro motion parallel with transmission shaft to produce carrys out work.Existing axial piston pump mainly comprises the parts such as transmission shaft, cylinder body, the thrust plate that coaxially arranges with cylinder body.Drive cylinder body to rotate by transmission shaft, thrust plate is motionless, and hydraulic oil enters in cylinder body vertically from the waist-shaped hole thrust plate, such as, be 4 symmetrical waist-shaped holes.In this plunger pump, the diameter of thrust plate is consistent with diameter of cylinder, due to the faying surface gapless of the non-waist-shaped hole of cylinder body and thrust plate, so the static pressure flow mode rotated that rubs can only be adopted to complete oil suction and oil extraction work.When design pressure and the working pressure raising of pump, friction aggravation in rotation between thrust plate and cylinder body plane, there is dry condition in formation thrust plate and cylinder body faying surface, thus causes thrust plate and cylinder body faying surface are worn and produce axial leakage of oil, causes plunger pump to scrap.In addition, to improve along with design pressure and the friction aggravation of flow position makes the temperature of fluid in pump raise (60 DEG C as oil temperature to be increased to 32.5MPa during from 50 during low pressure 20MPa DEG C), and then oil viscosity diminishes, the volumetric efficiency of pump decline and do not reach NBS.Therefore, the design pressure peak of existing axial piston pump is generally at 31.5 ~ 35MPa.A kind of thrust plate of import pump and cylinder body flow face is separately had to be the axial piston pump of spherical calotte, planar disk is compared in such design, appropriateness can alleviate the friction at flow position, thus the design pressure of pump can appropriateness improve, but such axial piston pump exists again the extremely expensive problem of the curve surface of workpiece type processed complex at flow position, axial piston pump and accessory thereof.
Thus, above-mentioned two kinds of plunger pumps have respective merits and demerits, and the design pressure of radial plunger pump is higher in simple terms, but complex structure, device is bulky.And the flow mode of axial piston pump determines its design pressure, the needs that hydraulic energy is provided to powerful device cannot be adapted to.Thus related domain needs to research and develop a kind of brand-new plunger pump.
Summary of the invention
The object of the invention is to provide that a kind of structure is simple, technique is advanced, easy manufacture, rotating speed is high, linear velocity is low, friction factor is little, long service life, be widely used and (can either work medium with oil, can to work medium with water again, can also to work medium with gas) the quantitative axial piston pump of radial flow, to solve the aforementioned problems in the prior.
The invention provides a kind of quantitatively axial piston pump, described plunger pump is radial flow pump, comprises the transmission shaft rotated by external force drives, the cylinder body be connected with transmission shaft, flow cover, pintle and makes the swash plate of the quantitative output fluid of described plunger pump; Described cylinder body, flow cover and pintle are all coaxially arranged with described transmission shaft; Described flow cover is in cylindric, and flow cover is close-coupled in the cylindrical pit in cylinder body; Transmission shaft rotarily drive described cylinder body and flow cover rotates around pintle; One end of pintle axis is arranged in flow cover, and forms radial clearance at pintle and flow inner room; It is interior and be positioned at flow and overlap radial outside that many plungers arranged vertically or all arrange with the angle being axially inclination > 0 ° ~ 10 ° are arranged on cylinder bore; Fluid enters in cylinder bore through inhaling head piece, flow vertically in the medium runner axially arranged in pintle, more radial the first flow groove priority arranged flows into the through hole of flow cover and is arranged in the second flow groove of cylinder body radial direction setting and enters the cylinder bore of inhaling head piece side from pintle; Meanwhile, fluid flows to from the cylinder bore of drainage port side the second flow groove being arranged in cylinder body radial direction and arranging, then the through hole put through flow and the radial flow groove on pintle, after flowing through medium runner, flows out pintle and also discharges from drainage port.
The present inventor formerly attempts to invent a kind of high-pressure plunger metering pump, its application number is CN201210052645, but use flow cover to carry out coordinating with pintle and rotate because not relating in this plunger pump, more do not relate to and there is certain radial clearance between the two, to make in this variable displacement pump and actually could not to solve the problem of " there is a need in the field to provide a kind of working pressure high and the simple plunger pump of structure ".In addition, in this application also and the shape of unexposed suitable medium runner, the first flow groove and the second flow groove and structure; Many the circular arc grooves be arranged in parallel on the curved outer surface of also not openly pintle and/or in the curved interior surface of flow cover and concrete optimal way thereof.Therefore, this earlier application is just a kind of design of failing specific implementation also, by the design of inventor in subsequent process, improves and application, makes to the invention provides a kind of new plunger pump having industrial significance.
In the present invention, preferred described plunger is all arranged to the angle in 5 ~ 10 ° with transmission shafts, can reduce the friction of plunger and cylinder bore so further.In a kind of concrete mode of execution, plunger described in Fig. 1 is all that upper end makes plunger with axially at an angle towards radial outside, lower end towards radially inner side.
In a kind of concrete mode of execution, described cylinder body is formed by connecting in the axial direction by two cylindrical bodys that external diameter is different, is wherein greater than the second cylinder away from transmission shaft external connection end near the external diameter of the first cylinder of transmission shaft external connection end.Preferably, pump the inner of transmission shaft is coordinated by the mesopore of needle bearing with pintle top, and described needle bearing and transmission shaft are coaxially arranged; And pump the inner of described transmission shaft is arranged in the first cylinder.
In a kind of concrete mode of execution, the cylinder body cylindrical away from transmission shaft external connection end is connected with the end cap of plunger pump by conical bearing, and described conical bearing and transmission shaft are coaxially arranged.
In a kind of concrete mode of execution, described plunger pump also comprises and to mate the pump case arranged, the relief port be arranged on pump case with end cap, to coordinate and be positioned at its plunger piston slippery boots assembly away from transmission shaft external connection end side, return plate, spring and ball pivot with swash plate; Described spring and ball pivot press closer return plate, make return plate drive plunger piston slippery boots assembly be close to swash plate and rotate along with the rotation of transmission shaft, change the spatial volume of cylinder bore, reach the object of oil suction and oil extraction.
In a kind of concrete mode of execution, the external diameter of pintle is 20 ~ 65% of the maximum outside diameter of cylinder body.
In a kind of concrete mode of execution, the gap between pintle and flow overlap is 0.02-0.05mm.
In a kind of concrete mode of execution, in the position near transmission shaft external connection end, described plunger pump is also containing the deep groove ball bearing for connection for transmission axle and pump case, and described deep groove ball bearing and transmission shaft are coaxially arranged.
In a kind of concrete mode of execution, on the curved outer surface of described pintle and/or in the curved interior surface of flow cover, be arranged with many circular arc grooves (compensating groove) in parallel.Preferably, every bar circular arc groove to be communicated with narrower drainage end semi-circle groove by wider suction stream end semi-circle groove and to form; And the described width inhaling stream end compensating groove is 3 ~ 4mm, the width of drainage end compensating groove is 0.6 ~ 1.0mm, and the two is that align center is arranged with the center line of width direction.
The invention provides a kind of working pressure can up to the new plunger pump of 40 ~ 60MPa simultaneously little, compact structure of volume.The volumetric efficiency of plunger pump provided by the invention when working pressure is 32.5MPa up to more than 96%, can far exceed the volumetric efficiency 93% of existing axial piston pump under this working pressure.Plunger pump provided by the invention is compared with traditional radial plunger pump, and main advantage is that pump structure is simple, volume is little, lightweight; And compared with traditional axial piston pump, main advantage is that the rotating speed of pump can significantly improve, working pressure can significantly improve, flow increases exponentially, or under equal working pressure, the volumetric efficiency of pump provided by the invention significantly rises.Concrete, when removing the weight of lifting 100t to certain altitude with existing axial piston pump, it only can provide the working pressure of the highest 32.5MPa to make it must select the pump of large-size cylinders and associated components.And the axial piston pump provided in the present invention is provided, its working pressure can up to 40 ~ 60MPa, and use the cylinder body of stock size and the pump of associated components can realize this lifting.
The present invention has following beneficial effect:
(1) quantitative axial piston pump provided by the invention is the structural advantages combining domestic and international various pump series products, the new pump of the one that R & D design obtains.
(2) drive cylinder body and flow cover to rotate around pintle by transmission shaft, carry out medium flow by the second flow groove of inferior part of the cylinder block and the first flow groove on oil distributing shaft top; Overcome in prior art and utilize plane static pressure flow on cylinder body lower plane and thrust plate easily to cause fluid axial leakage or reduce the defect of plunger pump volumetric efficiency.
(3) because swashplate angle in the present invention is changeless, so the discharge capacity of each discharge capacity and suction medium turning output medium of this pump can remain unchanged, stable performance.
(4) the present invention adopts the radial flow of axial flow, and pintle outside diameter is little, and pintle and flow overlap for clearance sliding fit.Same, in the present invention, the diameter of flow cover greatly reduces, and its linear velocity reduces, and flow face becomes from the plane of thrust plate or sphere the cylindrical side wall that flow overlaps, the friction factor that flow is overlapped between pintle is little, is conducive to the rotating speed improving plunger pump, the whole efficiency of elevator pump.Such as, for prior art 63cy axial piston pump and JBDC radial plunger pump, the diameter of the former revolving part Maximum Contact circle (surface of contact of flow cover and thrust plate) is 160 millimeters, and the revolving part diameter of the latter is 300 millimeters.And the diameter only 40 millimeters of revolving part flow cover of the present invention.Compared to existing technology, flow cover diameter at least reduces by 3/4, then the linear velocity of flow cover circumference reduces by 3/4.Therefore the present invention is compared with the rotating speed 1500r/min of axial piston pump in prior art, and rotating speed of the present invention can bring up to more than 5000r/min.
(5) matching gap of 0.02-0.05 mm wide is provided with between flow cover inwall of the present invention and pintle outer surface, hydraulic oil can be allowed in cylinder body rotates to produce oil film wedge effect, formation is slidably matched, and avoids the static pressure friction of flow cover and oil distributing shaft plane.Thus improve pump speed, nominal pressure and nominal flow rate, widen its application area, extend its working life.
(6) the present invention relies on plunger piston slippery boots assembly and return plate to be close to rotation on static swash plate face and realizes suction medium and discharge medium, avoid the auxiliary elements such as the left and right oil cylinder using large discharge gear pump, plunger pump, servovalve, solenoid valve, back pressure valve, safety valve and plunger pump that radial pump is correlated with in prior art, simplify the single unit system of pump, save raw material and manufacture cost.
(7) the present invention is provided with the conical bearing being positioned at end cap and pump case joint, for bearing the thrust load and radial load that produce when cylinder body rotates and discharges medium, ensure that cylinder body and the transmission shaft stability in rotation.
Except object described above, feature and advantage, the present invention also has other object, feature and advantage.Below with reference to accompanying drawings, the present invention is further detailed explanation.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the section of structure of the preferred embodiment of the present invention;
Fig. 2 is that the D-D of Fig. 1 is to sectional drawing;
Fig. 3 is that the E-E of Fig. 1 is to sectional drawing;
Fig. 4 is the structural representation of radial plunger pump of the prior art.
Wherein, 1, end cap, 2, pintle, 3, flow cover, 31, through hole, 4, conical bearing, 5, pump case, 6, needle bearing, 7, cylinder body, the 71, first cylinder, 72, the second cylinder, 8, plunger piston slippery boots assembly, 81, plunger, 811, plunger hole position, 9, return plate, 10, swash plate, 11, deep groove ball bearing, 12, transmission shaft, 13, spring, 14, ball pivot, 15, flow groove, the 151, first flow groove, the 152, second flow groove, 16, medium runner, A, suction head piece, B, drainage port, C, relief port.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are described in detail, but the multitude of different ways that the present invention can limit according to claim and cover is implemented.
The invention provides a kind of quantitatively axial piston pump, described plunger pump is radial flow pump, comprises that the transmission shaft 12, the cylinder body 7 be connected with transmission shaft, the flow that rotate by external force drives overlap 3, pintle 2 and make the swash plate 10 of the quantitative output fluid of described plunger pump; Described cylinder body, flow cover and pintle are all coaxially arranged with described transmission shaft; Described flow cover is in cylindric, and flow cover is close-coupled in the cylindrical pit in cylinder body; Transmission shaft rotarily drive described cylinder body and flow cover rotates around pintle; Axial one end of pintle is arranged in flow cover, and forms radial clearance at pintle and flow inner room; It is interior and be positioned at flow and overlap radial outside that many plungers 81 arranged vertically or all arrange with the angle being axially inclination > 0 ° ~ 10 ° are arranged on cylinder bore; Fluid enters in cylinder bore through inhaling head piece A, flow vertically in the medium runner 16 axially arranged in pintle, more radial the first flow groove 151 priority arranged flows into the through hole 31 of flow cover and is arranged in the second flow groove 152 of cylinder body radial direction setting and enters the plunger inhaling head piece side from pintle; Meanwhile, fluid flows to the second flow groove being arranged in cylinder body radial direction and arranging from the plunger of drainage port side, then the through hole put through flow and radial the first flow groove arranged on pintle, after flowing through medium runner, flows out pintle and also discharges from drainage port B.
Those skilled in the art are accessible, and described suction head piece and drainage port are arranged on the relative position of described plunger pump radial direction.Inhale fluid in the fluid at several plunger places of head piece side (upper side of swash plate) and the second flow groove when rotating to drainage port side (the comparatively downside of swash plate) with cylinder body, fluid in these several plungers and flow in the second flow groove of drainage port side, in the first flow groove entering drainage port side again from the through hole 31 of drainage port side and medium runner, then discharge plunger pump from drainage port.
Contain 9 plungers altogether in the plunger pump of Fig. 3 display, correspondence 9 columniform second flow grooves and 9 manholes, the described medium runner 16 axially arranged is in waist type, and totally 2 medium runners difference correspondences inhale head pieces and each one of drainage port.Those skilled in the art are accessible, and described plunger can be other quantity, such as 3-7.Same, described medium runner 16 also can be other number, such as 4, there is certain wall thickness to ensure the intensity of pintle as long as be convenient to process and can keep having between multiple medium runner between the outer surface of certain wall thickness and every bar medium runner and pintle.Radial the first flow groove be positioned on pintle arranged is crescent shape, and its quantity is 2, respectively corresponding suction head piece and each one of drainage port.
In the present invention, described transmission shaft is such as splined shaft.The material of described flow cover is different from the material of cylinder body, and described flow cover is such as copper sheathing.
Described cylinder body is formed by connecting in the axial direction by two cylindrical bodys that external diameter is different, is wherein greater than the second cylinder 72 away from transmission shaft external connection end near the external diameter of the first cylinder 71 of transmission shaft external connection end.
In the present invention, described second cylinder communicates with between the first cylinder, and the object of the second cylinder is the axial length structure of cover part or whole pintle, and thus the diameter of the second cylinder is set to slightly larger than described pintle.
In the present invention, pump the inner of transmission shaft is coordinated with pintle by needle bearing 6, and described needle bearing and transmission shaft are coaxially arranged; And pump the inner of described transmission shaft is arranged in the first cylinder.Those skilled in the art's easy understand, the external connection end of described transmission shaft refers to its one end be connected with motor or motor, and its pump the inner refers to that it is in the one end in plunger pump.In the present invention, preferably also in pump, be provided with needle bearing 6, its objective is that to make the setting in pump more firm, pump performance is more superior.
Cylinder body cylindrical away from transmission shaft external connection end is connected with the end cap 1 of plunger pump by conical bearing 4, and described conical bearing and transmission shaft are coaxially arranged.In the present invention, described conical bearing comprises the bearing support be interference fitted on cylinder body and the bearing housing be interference fitted on end cap.
Described plunger pump also comprises and to mate the pump case 5 arranged, the relief port C be arranged on pump case with end cap, to coordinate and be positioned at its plunger piston slippery boots assembly 8 away from transmission shaft external connection end side, return plate 9, spring 13 and ball pivot 14 with swash plate; Described spring 13 and ball pivot 14 press closer return plate 9, make return plate 9 drive plunger piston slippery boots assembly 8 be close to swash plate and rotate along with the rotation of transmission shaft, change the spatial volume of cylinder bore, reach the object of oil suction and oil extraction.
The external diameter of pintle is 20 ~ 65% of the maximum outside diameter of cylinder body.Preferably, the external diameter of pintle is 25 ~ 62.5% of the maximum outside diameter of cylinder body, and in a kind of specific embodiment, when the maximum outside diameter of described cylinder body is 120mm, the external diameter of described pintle is 32 ~ 50mm.The external diameter of described pintle designs according to the diameter of the external diameter of cylinder body and transmission shaft, and the diameter of pintle is generally greater than transmission shaft diameter (being such as 20mm).According to different discharge capacity needs, under average case, the diameter of described pintle is between 20 ~ 120mm.In the present invention, strict restriction be there is no to the axial length of pintle, as long as be applicable to arranging each necessary parts thereon.In a kind of concrete mode of execution, the axial length of described pintle is 40 ~ 120mm, and the external diameter of described first cylinder is 120mm, internal diameter is 80mm, and the external diameter of described second cylinder is 80mm, internal diameter is 50mm.
Gap between pintle and flow overlap is 0.02-0.05mm.Between flow cover and pintle, the gap of 0.02-0.05mm makes to form oil film wedge effect therebetween, and formation is slidably matched, the wearing and tearing that there will not be dry friction between flow cover and pintle and situation about burning out.In the present invention pintle and flow overlap between the axial flow of fluid can't form large leakage of oil situation, the oil film wedge effect herein produced only can play lubrication to rotation.
In a kind of concrete mode of execution, the axial the other end of flow adopts interference fit to be connected with end cap.In a kind of concrete mode of execution, the material of described pintle, swash plate and transmission shaft is GCr15 Steel material, and the material of described flow cover is QA19-4 tin bronze material.In a kind of concrete mode of execution, described first flow groove is arranged on 1/5 ~ 4/5 region at the axially middle part of pintle.And the axial length of described first flow groove, the diameter of through hole and the diameter of the second flow groove all identical, be such as 6 ~ 8mm.
In the position near transmission shaft external connection end, described plunger pump is also containing the deep groove ball bearing 11 for connection for transmission axle and pump case, and described deep groove ball bearing and transmission shaft are coaxially arranged.
Many circular arc grooves are arranged with in parallel on the curved outer surface of described pintle and/or in the curved interior surface of flow cover.Described circular arc groove is also referred to as compensating groove.Its objective is and make cylinder body, flow overlap spin balancing between pintle.The groove width of described circular arc groove is 0.6 ~ 4mm, and such as the width of whole piece circular arc groove is 0.8mm; Distance between every bar circular arc groove is preferably 3 ~ 8mm.The cross section of described circular arc groove can be the shapes such as arc, semicircle, triangle, trapezoidal, rectangle, unrestricted to this in the present invention.
In a kind of concrete mode of execution, every bar circular arc groove to be communicated with narrower drainage end semi-circle groove by wider suction stream end semi-circle groove and to form; And the described width inhaling stream end semi-circle groove is 3 ~ 4mm, the width of drainage end semi-circle groove is 0.6 ~ 1.0mm, and the two is that align center is arranged with the center line of width direction.The circular arc groove of above-mentioned special shape can make to form overbalance in pump and coordinate, advantageously in plunger pump performance.
In addition, those skilled in the art can understand ground, described medium runner 16 can be not exclusively parallel with axial line, as long as be roughly arranged on axially, such as its center line and axial line are angle between 0 ~ 30 ° is also feasible, as long as guarantee to there is certain wall thickness between the two ends of medium runner 16 and the outer surface of pintle.In like manner, described first flow groove 151 and the second flow groove 152 do not need to be arranged on completely on radial plane yet, and it and radial plane are that angle between 0 ~ 30 ° is also feasible.These modes are all the equivalent substitute modes of technological scheme in the present invention, are just limited to a concrete direction in the present invention for convenience of description and by the direction of medium runner 16 and flow groove 15.
Number of spare parts of the present invention is few, and structure is simple, easily manufactures.Pump case 5 and end cap 1 are coated on the outside of cylinder body 7, and engaging is integrated mutually, forms the containment vessel of whole pump.
In the present invention, two relief port C are symmetricly set on the side of described pump case 5.Relief port C makes each parts in pump be lubricated, and unnecessary oil is leaked away.Obtaining the position of lubricating is such as the cooperation place of the cooperation place of flow cover and the cooperation place of pintle, piston shoes and swash plate, plunger and cylinder bore.Leakage Energy in relief port C is the smaller the better, macroscopic, and axial piston pump provided by the invention obviously reduces than the leakage flow of axial piston pump in prior art.
In the present invention, the medium channel hole of pintle bottom and described end cap sidewall adopts interference fit, prevents oil liquid leakage.
In addition, the material of pintle 2 and transmission shaft 12 is GCr15 Steel material, improves its hardness and wear resistance by quenching.It is QA19-4 tin bronze material that flow overlaps 3 materials, has higher wear resistance.The material of swash plate 10 is GCr15 Steel material, and by the hard nitrogenize of heat treatment ion, its hardness can reach 900-1100HV, both can improve the wear resistance on swash plate 10 surface, can extend again the working life of swash plate 10.
Existing quantitative axial piston pump is when working pressure is 20MPa, and flow is 105L/min, and when pressure progressively raises, flow diminishes, and during as being increased to 32.5MPa, flow is 98L/min, then its volumetric efficiency is 98/105=93.33%.Because frictional heating makes the viscosity of hydraulic oil reduce, and oil temperature raises.If oil temperature during 20MPa is 50 DEG C, and during 32.5MPa, oil temperature is increased to 55-60 DEG C.The quantitative axial piston pump provided in the present invention, during pressure 20MPa, flow is similarly about 105L/min; But because in pump, the heating of hydraulic oil is not obvious, the temperature of hydraulic oil remains between 45 ~ 55 DEG C, can not more than 55 DEG C, and the flow thus during its high pressure 32.5MPa is 100 ~ 101L/min, then its volumetric efficiency can reach more than 96.19%.This just explanation, pump provided by the invention compared to existing technology, when guarantee volumetric efficiency be up to state standards more than 93%, its working pressure can be higher, the temperature such as reaching hydraulic oil during 45MPa also can not obviously raise, and viscosity can not obviously reduce.By plunger pump for some engineering machinery, pressure often raises 0.1MPa, and object just can elevate one meter more, and thus quantitative axial piston pump provided by the invention has great using value.
In the present invention, described swash plate is generally disc-shaped structure, but those skilled in the art are accessible, and static swash plate also can be other shape, such as rounded square.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (10)

1. a quantitative axial piston pump, described plunger pump is radial flow pump, comprises the transmission shaft (12) rotated by external force drives, the cylinder body (7) be connected with transmission shaft, flow cover (3), pintle (2) and makes the swash plate (10) of the quantitative output fluid of described plunger pump;
Described cylinder body, flow cover and pintle are all coaxially arranged with described transmission shaft; Described flow cover is in cylindric, and flow cover is close-coupled in the cylindrical pit in cylinder body; Transmission shaft rotarily drive described cylinder body and flow cover rotates around pintle; One end of pintle axis is arranged in flow cover, and forms radial clearance at pintle and flow inner room;
It is interior and be positioned at the radial outside that flow overlaps that many plungers (81) arranged vertically or all arrange with the angle being axially inclination > 0 ° ~ 10 ° are arranged on cylinder bore; Fluid enters in plunger pump through inhaling head piece (A), flow vertically in the medium runner (16) axially arranged in pintle, then the first flow groove (151) of radial setting from pintle successively flows into the through hole (31) of flow cover and is arranged in the second flow groove (152) of cylinder body radial direction setting and enters the plunger inhaling head piece side; Simultaneously, fluid flows to the second flow groove being arranged in cylinder body radial direction and arranging from the plunger of drainage port side, the through hole put through flow again and on pintle radial the first flow groove arranged, after flowing through medium runner, flow out pintle and also discharge from drainage port (B).
2. plunger pump according to claim 1, it is characterized in that, described cylinder body is formed by connecting in the axial direction by two cylindrical bodys that external diameter is different, is wherein greater than the second cylinder (72) away from transmission shaft external connection end near the external diameter of first cylinder (71) of transmission shaft external connection end.
3. plunger pump according to claim 2, is characterized in that, pump the inner of transmission shaft is coordinated with pintle by needle bearing (6), and described needle bearing and transmission shaft are coaxially arranged; And pump the inner of described transmission shaft is arranged in the first cylinder.
4. plunger pump according to claim 1, is characterized in that, the cylinder body cylindrical away from transmission shaft external connection end is connected with the end cap (1) of plunger pump by conical bearing (4), and described conical bearing and transmission shaft are coaxially arranged.
5. plunger pump according to claim 1, it is characterized in that, described plunger pump also comprises and to mate the pump case (5) arranged, the relief port (C) be arranged on pump case with end cap, to coordinate and be positioned at its plunger piston slippery boots assembly away from transmission shaft external connection end side (8), return plate (9), spring (13) and ball pivot (14) with swash plate; Described spring (13) and ball pivot (14) press closer return plate (9), make return plate (9) drive plunger piston slippery boots assembly (8) be close to swash plate and rotate along with the rotation of transmission shaft, change the spatial volume of cylinder bore, reach the object of oil suction and oil extraction.
6. plunger pump according to claim 1, is characterized in that, the external diameter of pintle is 20 ~ 65% of the maximum outside diameter of cylinder body; The sectional shape of described medium runner in radial plane is kidney-shaped, and its quantity is for inhaling head piece side and each one of drainage port side; The sectional shape of described first flow groove in radial plane is crescent shape, and its quantity is for inhaling head piece side and each one of drainage port side; Described second flow groove is cylindrical hole shape, and its quantity is consistent with the quantity of many described plungers.
7. according to the plunger pump in claim 1 ~ 6 described in any one, it is characterized in that, the gap between pintle and flow overlap is 0.02-0.05mm.
8. according to the plunger pump in claim 1 ~ 6 described in any one, it is characterized in that, in the position near transmission shaft external connection end, described plunger pump is also containing the deep groove ball bearing (11) for connection for transmission axle and pump case, and described deep groove ball bearing and transmission shaft are coaxially arranged.
9. according to the plunger pump in claim 1 ~ 6 described in any one, it is characterized in that, on the curved outer surface of described pintle and/or in the curved interior surface of flow cover, be arranged with many circular arc grooves in parallel.
10. plunger pump according to claim 9, is characterized in that, every bar circular arc groove to be communicated with narrower drainage end semi-circle groove by wider suction stream end semi-circle groove and to form; And the described width inhaling stream end semi-circle groove is 3 ~ 4mm, the width of drainage end semi-circle groove is 0.6 ~ 1.0mm, and the two is that align center is arranged with the center line of width direction.
CN201510377346.8A 2015-07-01 2015-07-01 A kind of quantitative axial plunger pump Active CN104948409B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110630465A (en) * 2019-09-29 2019-12-31 符鹏 Plunger pump
CN111237154A (en) * 2020-03-02 2020-06-05 宁波真格液压科技有限公司 Submersible pump

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CN201771701U (en) * 2010-09-03 2011-03-23 北京工业大学 Inclined disc type valve flow distribution high pressure pure water plunger pump
CN102588266A (en) * 2012-03-02 2012-07-18 张意 Novel high-pressure plunger piston fixed displacement pump
JP2014181625A (en) * 2013-03-19 2014-09-29 Kayaba Ind Co Ltd Swash plate type piston pump motor
CN204755209U (en) * 2015-07-01 2015-11-11 张坚 Ration axial plunger pump

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Publication number Priority date Publication date Assignee Title
CN101368552A (en) * 2008-09-23 2009-02-18 北京理工大学 Heeling moment full-balancing shaft distribution mechanism and bidirectional variable radial ball piston pump
CN201771701U (en) * 2010-09-03 2011-03-23 北京工业大学 Inclined disc type valve flow distribution high pressure pure water plunger pump
CN102588266A (en) * 2012-03-02 2012-07-18 张意 Novel high-pressure plunger piston fixed displacement pump
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CN204755209U (en) * 2015-07-01 2015-11-11 张坚 Ration axial plunger pump

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110630465A (en) * 2019-09-29 2019-12-31 符鹏 Plunger pump
CN111237154A (en) * 2020-03-02 2020-06-05 宁波真格液压科技有限公司 Submersible pump

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