CN204941800U

CN204941800U - A kind of axial variable displacement plunger pump

Info

Publication number: CN204941800U
Application number: CN201520463993.6U
Authority: CN
Inventors: 张意
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-07-01
Filing date: 2015-07-01
Publication date: 2016-01-06
Anticipated expiration: 2025-07-01

Abstract

The utility model provides a kind of axial variable displacement plunger 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 Variable Control parts of described plunger pump variable output fluid; Described cylinder body, flow cover and pintle are all coaxially arranged with described transmission shaft.The plunger pump that the utility model provides 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, nominal flow rate can increase exponentially, or under equal working pressure, the volumetric efficiency of the pump that the utility model provides significantly rises, noise can decline more than 10 decibels.

Description

A kind of axial variable displacement plunger pump

Technical field

The utility model relates to plunger pump field, especially, relates to a kind of axial variable displacement plunger 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.In addition, the complexity that its Variable Control parts of structures shape of radial plunger pump can be suitable.

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 especially its Variable Control form is single, and it is quite difficult to realize Variable Control.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 Variable plunger pump.

Model utility content

The utility model object 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 axial variable displacement plunger pump of radial flow, to solve the aforementioned problems in the prior.

The utility model provides a kind of axial variable displacement plunger 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 Variable Control parts of described plunger pump variable output fluid; 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; Described Variable Control parts comprise reel cage assembly, and the variable realizing fluid by changing angulation between the lower end surface of described reel cage assembly and transmission shaft under external force driving exports; 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.

Inventor of the present utility model formerly attempts to invent a kind of high-pressure plunger variable displacement pump, its application number is CN201210052638, but use flow cover to carry out coordinating with pintle and rotate because not relating in this variable displacement 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 the utility model provide a kind of new plunger pump having industrial significance.

In the utility model, 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.In a kind of concrete mode of execution, described second cylinder is connected with pintle by conical bearing, and described conical bearing and transmission shaft are coaxially arranged.

In a kind of concrete mode of execution, the circular arc block be arranged between transmission shaft external connection end and reel cage assembly is also comprised in described Variable Control parts, be arranged on the pressure regulator valve of drainage port side, adjustable lever, variable piston and variable piston sleeve, be arranged on the piston rod and variable spring of inhaling head piece side, and be arranged on the plunger piston slippery boots variable assembly inhaling head piece and drainage port both sides each; Described adjustable lever is for controlling the maximum value of angulation between the lower end surface of reel cage assembly and transmission shaft, described pressure regulator valve is used for regulating in real time angulation between the lower end surface of reel cage assembly and transmission shaft, and described piston rod and variable spring make angulation between the lower end surface of reel cage assembly and transmission shaft determine for balancing the power that comes from variable piston sleeve.

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 reel cage assembly; Described spring and ball pivot press closer return plate, make return plate drive plunger piston slippery boots assembly be close to reel cage assembly 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; 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.One end that pintle shown in Fig. 1 has diameter larger and the less one end of diameter, one end that diameter is less is arranged in flow cover.In the utility model, described " external diameter of pintle " refers to the external diameter of the pintle overlapping the one end coordinated with flow.

In a kind of concrete mode of execution, the radial clearance 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.The curved outer surface of described pintle and pintle overlap the cylindrical of the one end coordinated with flow, the curved interior surface of described flow cover and the inner circle of flow cover.

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 utility model 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 the plunger pump that the utility model provides 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.The plunger pump that the utility model provides 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 the pump that the utility model provides 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 utility model 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 utility model has following beneficial effect:

(1) axial variable displacement plunger pump that the utility model provides 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 the inclination angle of the utility model mid cradle assembly is variable, so the discharge capacity of each discharge capacity and suction medium turning output medium of this pump all can change according to the actual requirements; As consecutive variations, interval change or remain unchanged, stable performance.

(4) the utility model 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 utility model, 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 utility model.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 utility model is compared with the rotating speed 1500r/min of axial piston pump in prior art, and rotating speed of the present utility model 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 utility model 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 utility model relies on plunger piston slippery boots assembly and return plate to be close to the variable reel cage assembly in the angle of inclination of lower face rotates and realizes sucking medium and discharging 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.The utility model entity is axial pump, thus its Variable Control parts overall structure is simple, easily Variable Control is realized by multiple different mode, as manual variable, variable displacement with constant power, constant-pressure variable etc., in concrete Variable Control parts can be Pneumatic pressure, ARTIFICIAL FORCE, screw rod and solenoid valve etc. to power mode.

(7) the utility model is provided with conical bearing, 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 utility model also has other object, feature and advantage.Below with reference to accompanying drawings, the utility model is described in further detail.

Accompanying drawing explanation

The accompanying drawing forming a application's part is used to provide further understanding of the present utility model, and schematic description and description of the present utility model, for explaining the utility model, is not formed improper restriction of the present utility model.In the accompanying drawings:

Fig. 1 is the structural front view of the utility model preferred embodiment;

Fig. 2 is the main pseudosection of part-structure of the utility model preferred embodiment;

Fig. 3 is that the D-D of Fig. 2 is to sectional drawing;

Fig. 4 is that the E-E of Fig. 2 is to sectional drawing;

Fig. 5 is the structural representation of radial plunger pump of the prior art;

Fig. 6 is the main TV structure schematic diagram of the circular arc groove be arranged on pintle.

Wherein, 1, end cap, 2, pintle, 3, flow cover, 31, through hole, 4, conical bearing, 5, pump case, 6, circular arc block, 7, cylinder body, 71, first cylinder, 72, second cylinder, 8, plunger piston slippery boots assembly, 81, plunger, 811, plunger hole position, 9, return plate, 10, reel cage assembly, 11, deep groove ball bearing, 12, transmission shaft, 13, spring, 14, ball pivot, 15, flow groove, 151, first flow groove, 152, second flow groove, 16, medium runner, 17, pressure regulator valve, 18, adjustable lever, 19, variable piston, 20, variable piston sleeve, 21, plunger piston slippery boots variable assembly, 22, piston rod, 23, variable spring, A, inhale head piece, B, drainage port, C, relief port.

Embodiment

Below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail, but the multitude of different ways that the utility model can limit according to claim and cover is implemented.

The utility model provides a kind of axial variable displacement plunger 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 Variable Control parts of described plunger pump variable output fluid; 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; Described Variable Control parts comprise reel cage assembly 10, and the variable realizing fluid by changing angulation between the lower end surface of described reel cage assembly and transmission shaft under external force driving exports; 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.

The aperture size of inhaling head piece A in Fig. 2 is greater than drainage port B.

Essence of the present utility model or axial pump, the Variable Control parts thus in the axial variable displacement plunger pump that provides of the utility model can use the aleatory variable controlling component of axial pump in prior art, this in the utility model without any restriction.Without the need to using expensive variable-frequency motor in the utility model, and use fixed motor frequently can realize the regulation and control to plunger POF like a cork.

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 (reel cage assembly tilt upper side) and the second flow groove when rotating with cylinder body to drainage port side (the comparatively downside that reel cage assembly tilts), 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. 4 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 utility model, 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 utility model, 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.

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 utility model, 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.

Described second cylinder is connected with pintle by conical bearing 4, and described conical bearing and transmission shaft are coaxially arranged.In the utility model, described conical bearing comprises bearing support and bearing housing.

The circular arc block be arranged between transmission shaft external connection end and reel cage assembly is also comprised in described Variable Control parts, be arranged on the pressure regulator valve of drainage port side, adjustable lever, variable piston and variable piston sleeve, be arranged on the piston rod and variable spring of inhaling head piece side, and be arranged on the plunger piston slippery boots variable assembly inhaling head piece and drainage port both sides each; Described adjustable lever is for controlling the maximum value of angulation between the lower end surface of reel cage assembly and transmission shaft, described pressure regulator valve is used for regulating in real time angulation between the lower end surface of reel cage assembly and transmission shaft, and described piston rod and variable spring make angulation between the lower end surface of reel cage assembly and transmission shaft determine for balancing the power that comes from variable piston sleeve.

In the utility model, adjustable lever is the Variable quantity scope for Moderator Variable pump, and such as in FIG, the angle maximum value of reel cage assembly and horizontal plane is 0 ~ 12 ° or 0 ~ 15 ° or other value.Particularly, in the utility model after passing through the good range of variables of adjustable lever manual tune, by pressure regulator valve 17 controlled variable piston 19 jacking variable piston sleeve 20, the piston shoes at variable piston sleeve and this place apply power upwards to reel cage assembly, and the angle of reel cage and horizontal plane is reduced, thus such as can keep change between 0 ~ 12 °.The existence of variable spring 23 make it possible to by it compression and uphold the power coming from pressure regulator valve 17 with balance, make the angle of inclination of reel cage assembly can be stabilized in certain value or stably change.The oil pressure given in variable piston is higher, then the deflection angle of reel cage assembly is less.

Circular arc block 6 in the utility model is bearing shell again, and it is fixing, and its existence makes reel cage assembly axially to swing up and down and can not rotate.Those skilled in the art are known, and the angle of inclination of Fig. 1 mid cradle assembly is larger, then the flow of the fluid of variable displacement pump output is larger; Its angle of inclination is less, then the flow of the fluid exported is less.

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 1, 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 reel cage assembly; 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 reel cage assembly 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 utility model, 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 utility model 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 flow cover is QA19-4 tin bronze material, and it has higher wear-resisting property, can improve the working life of plunger pump; The material of pintle is 38crmoAiA material, by heat treatment high-temperature tempering and hard nitrogenize, can improve its hardness, wear resistance and working life.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 utility model.

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, the two is that align center is arranged with the center line of width direction, and as shown in Figure 6, the dimension scale relation of each parts in Fig. 6 does not represent actual conditions to its schematic diagram.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 utility model, are just limited to a concrete direction in the utility model for convenience of description and by the direction of medium runner 16 and flow groove 15.

The utility model number of spare parts 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 utility model, 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 reel cage assembly, plunger and cylinder bore.Leakage Energy in relief port C is the smaller the better, macroscopic, and the axial piston pump that the utility model provides obviously reduces than the leakage flow of axial piston pump in prior art.

In the utility model, 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 is 38crmoAiA material, by heat treatment high-temperature tempering and hard nitrogenize, can improve its hardness, wear resistance and working life.It is QA19-4 tin bronze material that flow overlaps 3 materials, has higher wear resistance.Compared to existing technology, when guaranteeing that volumetric efficiency is up to state standards above, its working pressure can be higher for the pump that the utility model provides, and 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 the axial variable displacement plunger pump that thus the utility model provides has great using value.

The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.

Claims

1. an axial variable displacement plunger 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 Variable Control parts of described plunger pump variable output fluid;

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;

Described Variable Control parts comprise reel cage assembly (10), and the variable realizing fluid by changing angulation between the lower end surface of described reel cage assembly and transmission shaft under external force driving exports;

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, described second cylinder is connected with pintle by conical bearing (4), and described conical bearing and transmission shaft are coaxially arranged.

4. plunger pump according to claim 1, it is characterized in that, the circular arc block (6) be arranged between transmission shaft external connection end and reel cage assembly is also comprised in described Variable Control parts, be arranged on the pressure regulator valve (17) of drainage port (B) side, adjustable lever (18), variable piston (19) and variable piston sleeve (20), be arranged on the piston rod (22) and variable spring (23) of inhaling head piece (A) side, and be arranged on the plunger piston slippery boots variable assembly (21) inhaling head piece and drainage port both sides each; Described adjustable lever is for controlling the maximum value of angulation between the lower end surface of reel cage assembly and transmission shaft, described pressure regulator valve is used for regulating in real time angulation between the lower end surface of reel cage assembly and transmission shaft, and described piston rod and variable spring make angulation between the lower end surface of reel cage assembly and transmission shaft determine for balancing the axial force that comes from variable piston sleeve.

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 (1), 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 reel cage assembly; Described spring (13) and ball pivot (14) press closer return plate (9), return plate (9) is made to drive plunger piston slippery boots assembly (8) be close to reel cage assembly 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 radial clearance 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.