CN110425127A - Plunger pump group and assignment method - Google Patents

Abstract

The invention discloses plunger pump group and assignment methods, including shell and pump group mechanism, and there are two runner plates for shell installation；Pump group mechanism is installed in the cavity between two runner plates, including fixed shaft gear train and at least two pump cores, is arranged with pump core in the gear of fixed shaft gear train；Pump core includes pump core shell, a plunger assembly and two flow valve modules；Plunger assembly includes plunger outer ring and plunger case, is connected between two plungers of plunger case by spring and is connected to plunger outer ring inner wall；Flow valve module includes flat valve outer ring and valve body, and the spool of valve body abuts flat valve outer ring inner wall under the action of flat valve spring force；Plunger outer ring and two flat valve outer rings are coaxially disposed and are fixedly connected with gear inner wall, and in gear rotation process, the inter_curve between flat valve outer ring inner wall and the inter_curve and plunger outer ring and plunger of valve core chamber is the closure variable diameter curve of smooth transition.The plunger pump group can reduce flow pulsation and pressure fluctuation.

Description

Plunger pump group and assignment method

Technical field

The invention belongs to the dynamical element fields in hydraulic system, in particular to plunger pump group and assignment method.

Background technique

Plunger pump is an important device in hydraulic system, is moved back and forth in cylinder body by plunger, makes to seal work The volume for making cavity changes to realize imbibition and hydraulic fluid.Plunger pump its it is high, compact-sized, high-efficient with rated pressure and The advantages that flow is easy to adjust, thus it is widely used in the occasion that high pressure, big flow and flow need to adjust, it is still, existing The plunger pump course of work flow pulsation it is larger, easily cause pressure fluctuation, vibration and noise, influence the property of hydraulic system Energy, service life and reliability.

For example, Chinese invention patent application CN201810118795.4 discloses a kind of radial plunger pump of motor-driven Flat valve (structure is as shown in Figure 1) and its assignment method.

The flow-distribution mechanism of the pump is two motor valves, and shell directly drives rotation by hollow shaft prime mover, specific in shell Under negative camber and spring collective effect, coordination between two spools and two plungers realizes hydraulic pump sucking or extrudes working media. The pump has the feature that (1) two-way operation, and motor transformation turns to, and inlet and outlet are exchanged；(2) motor stops (shell stopping turn It is dynamic), inlet and outlet cutting；(3) suck and extrude working media it is mutually indepedent, i.e., suction process when, do not extrude working media；It extrudes When process, working media is not sucked, and motor often rotates a circle, respectively twice, sucking and output are instantaneous for pump suction pressure working media Flow equation may be expressed as: to suck or extrude flow: q_sh=-2 υ_pS=-2r'(θ) ω S, S is plunger area of section, q_shIt is positive When indicate extrude working media；It when being zero, does not inhale and does not press, be in seal area；When being negative, sucking working media is indicated.

Motor speed: the π n rad/s of ω=2, wherein n=1000rpm；

Plunger motion speed: υ_P=r'(θ) ω

It is as shown in Figure 2 that it exports air-quantity chart.For single radial plunger pump, maximum value is set as 1, then its minimum value It is 0, flow pulse rate at this time is 9.426.

The double plunger of the pump acts on simultaneously, and when sucking different from extrusion, single machine moves the radial plunger of Flat valve when acting on Pump, flow pulsation is big, so as to cause pressure fluctuation, vibration and noise, influences performance, service life and the reliability of system.

Summary of the invention

In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is to the plunger pump group and assignment method provided should Plunger pump group can reduce flow pulsation and pressure fluctuation, while can reduce vibration and the noise of plunger pump, significantly improve plunger The working performance of pump extends service using life.

In order to achieve the above object, the technical solution adopted by the present invention are as follows:

A kind of plunger pump group, including shell and pump group mechanism, the upper and lower surfaces of the housing exterior walls are separately installed with hydraulic Connector, the upper and lower surfaces of the inner walls are separately installed with runner plate, and adjacent thereto hydraulic of the runner of the runner plate connects Head connection；

The pump group mechanism is installed in the cavity between two runner plates, and the pump group mechanism includes being installed on two runners Fixed shaft gear train and multiple pump cores between plate in cavity, the fixed shaft gear train includes ring gear, be installed in the ring gear and with The centre wheel of the ring gear coaxial arrangement, and be installed between the ring gear and the centre wheel and engaged simultaneously with the two Gear, each gear is circumferentially uniformly distributed around the wheel shaft of the centre wheel, and the wheel shaft of the centre wheel is fixedly installed in described On heart wheel central axes, the gear is arranged in a one-to-one correspondence with the pump core, and the pump core is sheathed in the gear；

The pump core includes the pump core shell for being fixedly connected with the runner plate, a plunger assembly and two flow valve groups Part；The plunger assembly include be sheathed on the pump core shell it is outer and can around the plunger outer ring of the pump core housing into rotation, and Cylinder body is fixedly installed in the intracorporal plunger case of pump core shell, and the plunger case is arranged radially along the plunger outer ring, the column The inner cavity both ends of plug cylinder are respectively equipped with a plunger, are connected between two plungers by spring, the pump core shell is two corresponding Plunger offers plunger outlet, and two plungers are pierced by from its corresponding plunger outlet respectively, and are supported under the effect of spring force It is connected to plunger outer ring inner wall；The flow valve module includes that be sheathed on the pump core shell outer and can be around the pump core shell The flat valve outer ring of rotation and outer wall are fixedly installed in the intracorporal valve body of pump core shell, and the valve body is along the flat valve Outer ring is arranged radially, and the spool that the pump core shell corresponds to valve body offers cartridge outlet, and the spool is from the cartridge outlet It is pierced by, and abuts the flat valve outer ring inner wall under the action of flat valve spring force；The pump core shell is equipped with connection institute The first through hole of the runner of valve port of valve body and runner plate adjacent thereto is stated, the pump core shell, which is equipped with, to be connected in the plunger case Second through-hole of chamber and the body cavity, two flow valve module mutual centres are symmetrical and plunger assembly is clipped in the middle, with Allow the plunger case inner cavity respectively by the runner connection of the valve port of its both ends flow valve module runner plate adjacent thereto； The plunger outer ring and two flat valve outer rings are coaxially disposed and are fixedly connected with the gear inner wall, and the gear rotated Between the inter_curve and the plunger outer ring and the plunger of Cheng Zhong, flat valve outer ring inner wall and the valve core chamber Inter_curve is the closure variable diameter curve of smooth transition.

Preferably, the pump core is set as odd number.

Preferably, the plunger pump group further includes prime mover for driving the fixed shaft gear train rotation.

Preferably, described prime mover includes the rotary electric machine outside the shell, the shell is equipped with for wearing One end of the wheel shaft axis hole of the centre wheel, the wheel shaft is pierced by shell from the axis hole and the rotary electric machine that is sequentially connected Shaft.

Preferably, the axis hole can be set to the upper surface or lower surface of the shell, the upper and lower table of the inner walls Face is separately installed with the first bearing being adapted to the wheel shaft, and one of first bearing is mounted on the axis hole, institute The one end for stating wheel shaft is successively pierced by a first bearing and axis hole adjacent thereto, the other end be located in the shell and with it is another A first bearing is connected.

Preferably, described prime mover can also be set as including rotary electric machine and be coaxially disposed with the shaft of the rotary electric machine And the turntable being fixedly connected, the turntable are located in the shell, the turntable is coaxially disposed with the ring gear and fixed company Connect the ring gear.The turntable can ring gear described in pin connection.

Preferably, flat valve outer ring inner wall is from the inter_curve of the valve core chamber by the curve of two kinds of different radians Section is spaced the composition that connects, and the curved section of identical radian measure is relative to the flat valve outer ring axial direction center line symmetrical setting；It is described Inter_curve between plunger outer ring and the plunger is connected by the curved section interval of two kinds of different radians to be constituted, and identical radian measure Curved section is relative to the plunger outer ring axial direction center line symmetrical setting.

Preferably, the shell includes detachable upper half-shell and housing lower half, the upper half-shell and lower half shell Body docks the cavity to be formed for installing the pump group mechanism, and two hydraulic joints are respectively arranged in outside the upper half-shell Wall upper surface and housing lower half outer wall lower surface, two runner plates are respectively arranged in the upper half-shell inner wall following table Face and housing lower half inner wall upper surface；The pump core shell is made of detachable two and half pump core shells docking.

Preferably, being fixedly connected between the upper half-shell and housing lower half by inner bolt；Two half pump cores It is bolted to connection between shell；Two flat valve outer rings of plunger outer ring pin connection, the plunger outer ring and described Gear inner wall described in the equal pin connection of the outer wall of flat valve outer ring, the wheel shaft are keyed the axis hole of the centre wheel.

Preferably, being equipped with flow passage cover plate between the inner walls and runner plate；The inner walls with it is described interior Gasket is installed between gear ring outer wall；It is realized between the runner plate that the valve port of the flow valve module communicates therewith by O-ring End face seal；It is sealed between the valve body and spool of the flow valve module by Glais ring, the Glais ring passes through Glais ring Cover board is fixed.

Preferably, the pump group mechanism connects the runner plate by second bearing, the second bearing is matched with described Stream valve outer ring is arranged in a one-to-one correspondence, and the bearing inner race of the second bearing and the runner plate and the pump core shell, which are fixed, to be connected It connects, the bearing outer ring of the second bearing is fixedly connected with the flat valve outer ring.

The invention also discloses a kind of assignment methods using above-mentioned plunger pump group: two hydraulic joints are respectively connected to liquid In pressure system, drive the wheel shaft rotation to drive the centre wheel and each gear fixed-axis rotation of the fixed shaft gear train, each gear turns It is dynamic that the plunger outer ring being fixedly connected with its inner wall and flat valve outer ring can be driven to rotate synchronously；In flat valve outer ring rotating process In, since the variable diameter of flat valve outer ring inner wall and the inter_curve of the valve core chamber acts on, spool is overcoming flat valve bullet Spring force is moved into valve body and under the effect of flat valve spring force to period reciprocation cycle continuous between valve extracorporeal movement, Flow valve module gradually closes when flow valve module is in the open state when middle spool is moved into valve body, spool is to valve extracorporeal movement It closes, since two flow valve module mutual centres are symmetrical, keeps two flow valve module alternatings in the open state；In plunger outer ring Under the action of inner wall curve, plunger overcome spring force moved into plunger case and spring force effect under to outside plunger case Continuous period reciprocation cycle between movement, plunger case cavity volume reduces when plunger is moved into plunger case, and pressure increase can be with Fluid is extruded from the flow valve module of unlatching, the fluid extruded from each pump core is through the runner and hydraulic joint stream in runner plate Out, plunger case cavity volume increases when plunger is moved to outside plunger case, and pressure reduces, and can be incited somebody to action by the flow valve module of unlatching Fluid sucks each pump core through the runner in hydraulic joint and runner plate.

Compared with prior art, the advantages and positive effects of the present invention are: providing plunger pump group and assignment method, lead to The cooperation for crossing multiple single radial plunger pumps achievees the effect that reduce flow pulsation, while also maintaining original function of individually pumping, As can two-way operation and having state self-retaining function.Original single plunger pump is effectively reduced because of volume change bring flow Pulsation and pressure fluctuation, while vibration and the noise of plunger pump are reduced, the working performance of pump is significantly improved, its work is extended Make the service life, compact-sized especially suitable for requiring, the variation of working environment, condition (such as environmental pressure) is to the performance shadow of flat valve Ring big, harsh to energy consumption, state holding requirement application field, such as deep-sea, space.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of existing motor valve flow distribution radial plunger pump；

Fig. 2 is the Instantaneous Flow curve of existing motor valve flow distribution radial plunger pump；

Fig. 3 is the structural schematic diagram of the fixed shaft gear train of the plunger pump group of embodiment；

Fig. 4 is the structural schematic diagram of the plunger pump group of embodiment；

Fig. 5 is the inner flow passage detail view of single gear in the plunger pump group of embodiment；

Fig. 6 is the cross-sectional view of single gear inner prop plug assembly in the plunger pump group of embodiment；

Fig. 7 is the Instantaneous Flow curve of the plunger pump group of embodiment.

In last figure: 1- shell, 11- hydraulic joint, 12- runner plate, 13- axis hole, 14- upper half-shell, 15- lower half shell Body, 16- flow passage cover plate, 17- gasket, 18-O type circle, 19- Glais ring, 191- Glais ring cover board, 2- pump core, 21- pump core shell, The outlet of 211- plunger, 212- cartridge outlet, 213- first through hole, the second through-hole of 214-, half pump core shell of 215-, 22- plunger group Part, 221- plunger outer ring, 222- plunger case, 223- plunger, 224- spring, 23- flow valve module, 231- flat valve outer ring, 232- valve body, 233- spool, 234- flow valve spring, 235- valve port, 3- fixed shaft gear train, 31- ring gear, 32- centre wheel, 321- Wheel shaft, 33- gear, 4- first bearing, 5- second bearing, 51- bearing inner race, 52- bearing outer ring.

Specific embodiment

In the following, the present invention is specifically described by illustrative embodiment.It should be appreciated, however, that not into one In the case where step narration, element, structure and features in an embodiment can also be advantageously incorporated into other embodiments In.

It should be noted that in the description of the present invention, term "inner", "outside", "upper", "lower", "left", "right", " preceding ", The orientation or positional relationship of instructions such as " rear " is positional relationship based on the figure, is merely for convenience of the description present invention and letter Change description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with specific orientation construct and Operation, therefore be not considered as limiting the invention.

Embodiment:

As shown in Figures 3 to 6, a kind of plunger pump group, including shell 1 and pump group mechanism, 1 outer wall of shell it is upper and lower Surface is separately installed with hydraulic joint 11, and the upper and lower surfaces of 1 inner wall of shell are separately installed with runner plate 12, the runner The runner of plate 12 hydraulic joint 11 adjacent thereto is connected to；

The pump group mechanism is installed in the cavity between two runner plates 12, and the pump group mechanism includes being installed on two streams Fixed shaft gear train 3 and multiple pump cores 2 in 12 cavitys of guidance tape, the fixed shaft gear train 3 include ring gear 31, are installed on the internal tooth Centre wheel 32 in circle 31 and with the ring gear 31 coaxial arrangement, and it is installed on the ring gear 31 and the centre wheel 32 Between and with the two meshed gears 33 simultaneously, each gear 33 around the centre wheel 32 wheel shaft 321 it is circumferential be uniformly distributed, it is described in The wheel shaft 321 of heart wheel 32 is fixedly installed on 32 central axes of centre wheel, and the gear 33 is set with the pump core 2 one-to-one correspondence It sets, the pump core 2 is sheathed in the gear 33；

The pump core 2 is matched including the 21, plunger assemblies 22 of pump core shell and two for being fixedly connected with the runner plate 12 Flow valve module 23；The plunger assembly 22 includes being sheathed on outside the pump core shell 21 and can rotating around the pump core shell 21 Plunger outer ring 221 and cylinder body are fixedly installed in the plunger case 222 in the pump core shell 21, and the plunger case 222 is along described Plunger outer ring 221 is arranged radially, and the inner cavity both ends of the plunger case 222 are respectively equipped with a plunger 223, two plungers 223 it Between be connected by spring 224, corresponding two plungers 224 of the pump core shell 21 offer plunger outlet 211, two plungers 224 It is pierced by from its corresponding plunger outlet 211, and is connected in the plunger outer ring 221 under the action of 224 elastic force of spring respectively Wall；The flow valve module 23 includes being sheathed on the flat valve that the pump core shell 21 is outer and can rotate around the pump core shell 21 Outer ring 231, and the valve body 232 being fixedly installed in the pump core shell 21, the valve body 232 is along the flat valve outer ring 231 are arranged radially, and the spool 233 of the corresponding valve body 232 of the pump core shell 21 offers cartridge outlet 212, and the spool 233 is certainly The cartridge outlet 212 is pierced by, and 231 inner wall of flat valve outer ring is abutted under the action of flow 234 elastic force of valve spring；Institute The first through hole 213 that pump core shell 21 is equipped with the runner of the valve port 235 and runner plate 12 adjacent thereto that are connected to the valve body is stated, The pump core shell 21 is equipped with the second through-hole 214 of connection 222 inner cavity of plunger case and 232 inner cavity of the valve body, and two are matched Stream 23 mutual centre of valve module symmetrically and by plunger assembly 22 is clipped in the middle, and (central symmetry described in the present embodiment refers to will be right As one of after 180 ° of axial-rotation can with another pair as be completely coincident or mirror symmetry), so that 222 inner cavity of plunger case can be with Pass through the runner connection of the valve port of its both ends flow valve module 231 runner plate 12 adjacent thereto respectively；The plunger outer ring 221 It is coaxially disposed with two flat valve outer rings 231 and is fixedly connected with 33 inner wall of gear, in 33 rotation process of gear, Inter_curve and the plunger outer ring 221 and the plunger between 231 inner wall of flat valve outer ring and the spool 233 Inter_curve between 223 is the closure variable diameter curve of smooth transition.

Using a kind of assignment method of above-mentioned plunger pump group: two hydraulic joints 11 being respectively connected in hydraulic system, are driven The rotation of wheel shaft 321 is moved to drive 33 fixed-axis rotation of centre wheel 32 and each gear of the fixed shaft gear train 3, each gear 33 rotates The plunger outer ring 221 being fixedly connected with its inner wall and flat valve outer ring 231 can be driven to rotate synchronously；In flat valve outer ring 231 In rotation process, since the variable diameter of the inter_curve between 231 inner wall of flat valve outer ring and the spool 233 acts on, spool 233 move and under the effect of 234 elastic force of flow valve spring to valve body 232 into valve body 232 overcoming 234 elastic force of flow valve spring Continuous period reciprocation cycle between outer movement, flow valve module 23 is in opening state when wherein spool 233 is moved into valve body 232 Flow valve module 23 progressively closes off when state, spool 233 are moved to outside valve body 232, due to two 23 mutual centres of flow valve module Symmetrically, replace two flow valve modules 23 in the open state；In plunger outer ring under the action of 221 inner wall curve, plunger 223 Between overcoming 224 elastic force of spring to move into plunger case 222 and being moved in the case where 224 elastic force of spring is acted on to outside plunger case 222 Continuous period reciprocation cycle, 222 cavity volume of plunger case reduces when plunger 223 is moved into plunger case 222, and pressure increase can To extrude fluid from the flow valve module 23 of unlatching, the fluid extruded from each pump core 2 is through the runner and liquid in runner plate 12 Crimp head 11 flows out, and 222 cavity volume of plunger case increases when plunger 223 is moved to outside plunger case 222, and pressure reduces, Ke Yitong It crosses the flow valve module 23 opened and fluid is sucked into each pump core 2 through the runner in hydraulic joint 11 and runner plate 12.

By the plunger assembly 22 of N number of pump core 2 of N number of gear 33 driving and radially at 2 π/N (such as the first plunger assembly angle It is 0, the second one-tenth 2 π/N, third is at 4 π/N ...), and it is axial uniformly distributed along wheel shaft 321.

When have 2 pump cores 2 circumferentially when, the instantaneous flow of the plunger pump group of the present embodiment is

q_sh=q_sh(θ)+q_sh(θ-π)；

3 pump cores 2 circumferentially when, the instantaneous flow of the plunger pump group of the present embodiment is

4 pump cores 2 circumferentially when, the instantaneous flow of the plunger pump group of the present embodiment is

5 pump cores 2 circumferentially when, the instantaneous flow of the plunger pump group of the present embodiment is

And so on, N number of plunger pump circumferentially when instantaneous flow are as follows:

Below choose N=7 when for, in the case where not considering leakage, the inlet flow rate of the plunger pump group of the present embodiment Size with rate of discharge is identical, therefore the instantaneous flow of the plunger pump group of the present embodiment is that synchronization is all in suction The flow of the flow and all pump cores 2 in extrusion state that enter the pump core 2 of state is the sum of cumulative.

Since the plunger assembly of single radial plunger pump of N number of gear driving and radial angulation are 2 π/N, Fig. 7 is made The Instantaneous Flow curve of pump group when N=7, calculate flow pulse rate be 0.762.From figure 7 it can be seen that flow arteries and veins at this time It is dynamic to be substantially reduced.It can similarly obtain, other N values, it is also possible that the flow pulsation of system reduces.

From above-mentioned analysis it is found that the plunger pump group and assignment method of the present embodiment, pass through matching for multiple single radial plunger pumps Conjunction achievees the effect that reduce flow pulsation, while also maintaining original function of individually pumping, as can two-way operation and having state Self-retaining function.Original single plunger pump is effectively reduced because of the flow pulsation of volume change bring and pressure fluctuation, is dropped simultaneously The vibration of low plunger pump and noise, significantly improve the working performance of pump, its working life are extended, especially suitable for requiring Compact-sized, the variation of working environment, condition (such as environmental pressure) influences greatly, to keep energy consumption, state on the performance of flat valve It is required that harsh application field, such as deep-sea, space.

Specifically, the pump core 2 is set as odd number.Compared to setting even number pump core 2, pump core 2 is set as odd number can be more Good reduction flow pulsation and pressure fluctuation.

Specifically, the hydraulic joint 11 is fast hydraulic pressure connector.

Specifically, the plunger pump group further includes prime mover for driving the fixed shaft gear train 3 to rotate.

Specifically, described prime mover includes the rotary electric machine outside the shell 1, the shell 1 is equipped with for wearing One end of 321 axis hole 13 of wheel shaft of the centre wheel 32, the wheel shaft 321 is pierced by shell 1 from the axis hole 13 and is sequentially connected The shaft of the rotary electric machine.

Specifically, the axis hole 13 can be set to the shell 1 upper surface or lower surface, 1 inner wall of shell it is upper and lower Surface is separately installed with the first bearing 4 being adapted to one with the wheel shaft 321, and one of first bearing 4 is mounted on described On axis hole 13, one end of the wheel shaft 321 is successively pierced by a first bearing 4 and axis hole 13 adjacent thereto, and the other end is located at It is connected in the shell 1 and with another first bearing 4.

Other than above-mentioned prime mover set-up mode, described prime mover can also be set as include rotary electric machine and with rotation electricity The turntable that the shaft of machine is coaxially disposed and is fixedly connected, the turntable are located in the shell 1, the turntable and the ring gear 31 are coaxially disposed and are fixedly connected with the ring gear 31.

It is fixedly connected with mode specifically, pin connection etc. can be used in the turntable and is connect with the ring gear 13.

Specifically, each gear 33 is symmetrical arranged relative to 321 central axes of wheel shaft of the centre wheel 32.

Specifically, 231 inner wall of flat valve outer ring and the inter_curve between the spool 233 are by two kinds of different radians Curved section interval connects composition, and the curved section of identical radian measure is symmetrically set relative to 231 longitudinal center line of flat valve outer ring It sets；Inter_curve between the plunger outer ring 221 and the plunger 223 is connected structure by the curved section interval of two kinds of different radians At, and the curved section of identical radian measure is symmetrical arranged relative to 221 longitudinal center line of plunger outer ring.

For example, the present embodiment, which uses, can be similar to plunger assembly and flow valve group in Chinese patent CN2018101187954 The set-up mode of part, the inner wall curve of the plunger outer ring are divided into four curved sections, two opposite curved section mutual centres pair Claim and radian is equal, two neighboring curved section radian is unequal；The inner wall curve of the flat valve outer ring is divided into four curved sections, Curved section mutual centre is symmetrical and radian is equal by opposite two, and two neighboring curved section radian is unequal.

Specifically, the shell 1 includes detachable upper half-shell 14 and housing lower half 15, the upper half-shell 14 is under Half shell 15 docks the cavity formed for installing the pump group mechanism, and two hydraulic joints 11 are respectively arranged on described 15 outer wall lower surface of 14 outer wall upper surface of half shell and the housing lower half, two runner plates 12 are respectively arranged on described 15 inner wall upper surface of 14 interior lower surface of half shell and the housing lower half；The pump core shell 21 is by two and half detachable pumps The docking of core shell body 215 is constituted.Use detachable shell 1 and pump core shell 215 can and maintenance assembled with more convenient plunger pump.

Specifically, being fixedly connected between the upper half-shell 14 and housing lower half 15 by hexagon socket head cap screw；Described in two It is fixedly connected between half pump core shell 215 by ball screw nut；221 pin connection of plunger outer ring, two flat valve outer rings 231, 33 inner wall of gear described in the equal pin connection of outer wall of the plunger outer ring 221 and the flat valve outer ring 231,321 key of wheel shaft Connect the axis hole of the centre wheel 32.

Specifically, being equipped with flow passage cover plate 16 between 1 inner wall of shell and runner plate 12；1 inner wall of shell and institute It states and is equipped between 31 outer wall of ring gear for reducing the gasket 17 to rub between the two；The valve port 235 of the flow valve module 23 End face seal is realized by O-ring 18 between the runner plate 12 communicated therewith；The valve body 232 and spool of the flow valve module 23 It is sealed between 233 by Glais ring 19, the Glais ring 19 is fixed by Glais ring cover board 191.

Specifically, the pump group mechanism connects the runner plate 12 by second bearing 5, the second bearing 5 with it is described Flat valve outer ring 231 is arranged in a one-to-one correspondence, outside the bearing inner race 51 of the second bearing 5 and the runner plate 12 and the pump core Shell 21 is fixedly connected, and the bearing outer ring 52 of the second bearing is fixedly connected with the flat valve outer ring 231.

The above described is only a preferred embodiment of the present invention, being not that the invention has other forms of limitations, appoint What those skilled in the art changed or be modified as possibly also with the technology contents of the disclosure above equivalent variations etc. It imitates embodiment and is applied to other fields, but without departing from the technical solutions of the present invention, according to the technical essence of the invention Any simple modification, equivalent variations and remodeling to the above embodiments, still fall within the protection scope of technical solution of the present invention.

Claims (10)

1. a kind of plunger pump group, it is characterised in that: including shell and pump group mechanism, the upper and lower surfaces of the housing exterior walls are distinguished Hydraulic joint is installed, the upper and lower surfaces of the inner walls are separately installed with runner plate, the runner of the runner plate and its phase Adjacent hydraulic joint connection；

The pump group mechanism is installed in the cavity between two runner plates, and the pump group mechanism includes being installed between two runner plates Fixed shaft gear train and multiple pump cores in cavity, the fixed shaft gear train includes ring gear, be installed in the ring gear and with it is described The centre wheel of ring gear coaxial arrangement, and the tooth for being installed between the ring gear and the centre wheel and being engaged simultaneously with the two Wheel, each gear are circumferentially uniformly distributed around the wheel shaft of the centre wheel, and the wheel shaft of the centre wheel is fixedly installed in the centre wheel On central axes, the gear is arranged in a one-to-one correspondence with the pump core, and the pump core is sheathed in the gear；

The pump core includes the pump core shell for being fixedly connected with the runner plate, a plunger assembly and two flow valve modules；Institute Stating plunger assembly includes being sheathed on outside the pump core shell and can consolidating around the plunger outer ring of the pump core housing into rotation and cylinder body Dingan County is loaded on the intracorporal plunger case of pump core shell, and the plunger case is arranged radially along the plunger outer ring, the plunger case Inner cavity both ends are respectively equipped with a plunger, are connected between two plungers by spring, and corresponding two plungers of the pump core shell are opened It is exported equipped with plunger, two plungers are pierced by from its corresponding plunger outlet respectively, and are connected to institute under the effect of spring force State plunger outer ring inner wall；The flow valve module includes that be sheathed on the pump core shell outer and can be around the pump core housing into rotation Flat valve outer ring, and it is fixedly installed in the intracorporal valve body of pump core shell, the valve body is radially set along the flat valve outer ring It sets, the spool that the pump core shell corresponds to valve body offers cartridge outlet, and the spool is pierced by from the cartridge outlet, and is being matched Flat valve outer ring inner wall is abutted under the action of stream valve spring elastic force；The pump core shell be equipped be connected to the valve port of valve body and The first through hole of the runner of runner plate adjacent thereto, the pump core shell, which is equipped with, is connected to the plunger case inner cavity and the valve body Second through-hole of inner cavity, two flow valve module mutual centres are symmetrical and plunger assembly is clipped in the middle；The plunger outer ring and Two flat valve outer rings are coaxially disposed and are fixedly connected with the gear inner wall, in the gear rotation process, the flow Inter_curve between valve outer ring inner wall and the inter_curve and the plunger outer ring and the plunger of the valve core chamber is flat Slip over the closure variable diameter curve crossed.

2. plunger pump group according to claim 1, it is characterised in that: further include for driving the fixed shaft gear train to rotate Prime mover.

3. plunger pump group according to claim 2, it is characterised in that: described prime mover includes turning outside the shell Dynamic motor, the shell are equipped with the wheel shaft axis hole for wearing the centre wheel, and one end of the wheel shaft is pierced by from the axis hole The shaft of shell and the transmission connection rotary electric machine.

4. plunger pump group according to claim 3, it is characterised in that: the axis hole be set to the shell upper surface or under Surface, the upper and lower surfaces of the inner walls are separately installed with the first bearing being adapted to the wheel shaft, one of them One bearing is mounted on the axis hole, and one end of the wheel shaft is successively pierced by a first bearing and axis hole adjacent thereto, separately One end is located in the shell and is connected with another first bearing.

5. plunger pump group according to claim 1, it is characterised in that: flat valve outer ring inner wall and the valve core chamber Inter_curve is connected by the curved section interval of two kinds of different radians to be constituted, and the curved section of identical radian measure is relative to the flat valve Outer ring axial direction center line symmetrical setting；The plunger outer ring is from the inter_curve between the plunger by the curve of two kinds of different radians Section is spaced the composition that connects, and the curved section of identical radian measure is relative to the plunger outer ring axial direction center line symmetrical setting.

6. plunger pump group according to claim 1, it is characterised in that: the shell includes detachable upper half-shell under Half shell, the upper half-shell and housing lower half dock the cavity to be formed for installing the pump group mechanism, and two described hydraulic Connector is respectively arranged in upper half-shell outer wall upper surface and housing lower half outer wall lower surface, two runner plates point It is not installed on the upper half-shell interior lower surface and housing lower half inner wall upper surface；The pump core shell is by detachable The docking of two and half pump core shells is constituted.

7. plunger pump group according to claim 1, it is characterised in that: the pump core is set as odd number.

8. plunger pump group according to claim 1, it is characterised in that: be equipped with stream between the inner walls and runner plate Road cover board；Gasket is installed between the inner walls and the annular gear outer-wall；The valve port of the flow valve module connects with it End face seal is realized by O-ring between logical runner plate；Pass through Glais ring between the valve body and spool of the flow valve module Sealing, the Glais ring are fixed by Glais ring cover board.

9. plunger pump group according to claim 1, it is characterised in that: the pump group mechanism passes through described in second bearing connection Runner plate, the second bearing are arranged in a one-to-one correspondence with the flat valve outer ring, the bearing inner race of the second bearing with it is described Runner plate is fixedly connected with the pump core shell, and the bearing outer ring of the second bearing is fixedly connected with the flat valve outer ring.

10. a kind of assignment method, it is characterised in that: using plunger pump group described in any one of claims 1 to 9；By two Hydraulic joint is respectively connected in hydraulic system, drives the wheel shaft rotation to drive the centre wheel and each gear of the fixed shaft gear train Fixed-axis rotation, each gear rotation can drive the plunger outer ring being fixedly connected with its inner wall and flat valve outer ring to rotate synchronously；In During flat valve outer ring rotating, since the variable diameter of flat valve outer ring inner wall and the inter_curve of the valve core chamber acts on, Spool overcome flat valve spring force moved into valve body and flat valve spring force effect under between valve extracorporeal movement Continuous period reciprocation cycle, flow valve module is in the open state when wherein spool move into valve body, spool is to valve body outward transport Flow valve module progressively closes off when dynamic, since two flow valve module mutual centres are symmetrical, makes at two flow valve modules alternatings In open state；In plunger outer ring under the action of inner wall curve, plunger is overcoming spring force to move into plunger case and in bullet Continuous period reciprocation cycle between being moved under spring force effect to outside plunger case, plunger case inner cavity when plunger is moved into plunger case Volume reduces, pressure increase, fluid can be extruded from the flow valve module of unlatching, the fluid extruded from each pump core is through runner Runner in plate and hydraulic joint outflow, plunger case cavity volume increases when plunger move to outside plunger case, pressure reduction, can be with Fluid is sucked into each pump core through the runner in hydraulic joint and runner plate by the flow valve module of unlatching.