CN101644259A - Regulating valve used for regulating delivery volume of reciprocating pump - Google Patents
Regulating valve used for regulating delivery volume of reciprocating pump Download PDFInfo
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- CN101644259A CN101644259A CN 200810145866 CN200810145866A CN101644259A CN 101644259 A CN101644259 A CN 101644259A CN 200810145866 CN200810145866 CN 200810145866 CN 200810145866 A CN200810145866 A CN 200810145866A CN 101644259 A CN101644259 A CN 101644259A
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Abstract
The invention relates to a regulating valve used for regulating the delivery volume of a reciprocating pump, which comprises a valve casing (21), a valve piston (22), a valve spring (25) and regulating equipment (27 and 28), wherein the valve piston (22) is mounted to be capable of moving in the valve casing, and comprises an actuating surface (23) used for valve actuating pressure (P20) of fluid;the valve spring (25) resists the force applied on the valve piston by the valve actuating pressure; and the valve piston can be regulated in the direction of the force applied by the valve actuatingpressure or in the direction opposite to the direction of the force applied by the valve actuating pressure through the regulating equipment (27 and 28). The invention also relates to a reciprocatingpump capable of regulating the delivery volume, which comprises a pump case (1), a delivery chamber formed in the pump case and comprising a fluid inlet (2) on the low-pressure side of the pump and afluid outlet (3) on the high-pressure side of the pump, a delivery element (5) capable of moving in the delivery chamber to deliver the fluid, and a regulating valve (20) used for regulating the delivery volume and arranged in the fluid delivered by the delivery element (5).
Description
Technical field
The present invention relates to a kind of modulating valve of the delivery volume that is used to regulate reciprocating pump and the reciprocating pump that comprises modulating valve, wherein said modulating valve is disposed in the delivery volume that is used to regulate the fluid of being carried by pump in the circulation of fluid of pump.Therefore, when being provided for the delivery volume of regulating reciprocating pump, the invention still further relates to modulating valve itself.
Background technique
Reciprocating pump with the proportional volume flow conveyance fluid of the speed of pump.Revolution or each reciprocal stroke---are so-called specific volume flow---to be constant or in fact can be considered to approach well constant at least.For instance, the constancy of revolution or every stroke and conflicting in some applications accordingly with the proportionality of the speed of pump, in these are used, low in the volume flow that the velocity range internal ratio of one or more pumps is produced by proportionality by the fluid demand that assembly had of separately pump supply.In each velocity range, pump therefore carried exceeded demand and diminished the volume flow that the lost territory guides away.This problem has description in US 6 126 420, it discloses a kind of internal gear pump with adjustable delivery volume that is used to address this problem simultaneously.
US 6 244 839 B1 disclose a kind of internal gear pump with adjustable delivery volume equally.For regulating, internal gear can move axially with respect to external gear.Internal gear is a part that moves axially regulon, and this moves axially regulon and is formed in the piston that both sides all can act on.By the 3-position 4-way modulating valve, regulon bears the fluid of being carried by pump.Modulating valve comprises valve casing and valve piston, and described valve piston can move forward and backward in valve casing vertically, and this valve piston bears the fluid that transports and the valve spring power of bearing the pressure of this fluid of opposing at another axial end at an axial end.The position of valve piston is set with the equilibrium of forces that is produced by hydrodynamic pressure according to the power of valve spring.Modulating valve is constructed such that proper when reaching by the predetermined hydrodynamic pressure of valve spring, and regulon moves to the axial position of minimum delivery volume from the axial position of maximum delivery volume.The bias force of valve spring is set on modulating valve in advance.
WO 03/058071 A1 discloses a kind of reciprocating pump, it comprises modulating valve, and the removable valve piston that is used to regulate the delivery volume of pump in this modulating valve is installed to be the on high-tension side fluid that bears self-pumping in the axial direction and bears the spring force opposite with fluid.In order to reduce the hydrodynamic pressure that pump is adjusted to downwards, a kind of control apparatus that is used for this modulating valve is provided, this control apparatus applies additional force on valve piston.Can quote the electric stepper motor of the bias force that is used for the modulating valve spring and be used to produce the example of the magnetic coil of additional magnetic force as control apparatus.Only acting on the mobile unit of pump on the direction of maximum delivery volume by the fluid of modulating valve connection is mobile, and the effect in the opposite direction constantly of on high-tension side pressure.
Summary of the invention
The demand of the assembly that an object of the present invention is neatly and accurately to make the delivery volume of reciprocating pump and will be supplied adapts, and continues to guarantee to provide sufficient supply to assembly.
The present invention carries out on assembly provides the basis of reciprocating pump of fluid being used for, described reciprocating pump comprises pump case, this pump case comprises conveying chamber and the delivery element that can move in this conveying chamber, this delivery element can act directly on the fluid so that conveying chamber is passed in its conveying.When carry out carrying motion, delivery element can be by oneself or is cooperated or can adopt more other delivery element, the outlet of passing conveying chamber by boost pressure from the inlet conveyance fluid of conveying chamber with another.Inlet is designated as the low voltage side of pump, and outlet is designated as the high pressure side of pump.Pump preferably is set in the enclosed circulation of fluid, but in principle can also be in the open type circulation of fluid conveyance fluid.In the time of in being bonded to the enclosed circulation of fluid, pump enters into conveying chamber in low voltage side withdrawn fluid from reservoir vessel by inlet, and in the high pressure side it is delivered to the assembly that needs the fluid supply or also can is in a plurality of assemblies.In the downstream of one or more assemblies, fluid enters reservoir vessel once more, thereby finishes circulation of fluid.For instance, pump can be used to hydraulic pressure that pressure fluid is provided.In a preferred embodiment, pump is mounted or is provided for and is installed in the motor vehicle, so that be the internal-combustion engine supply Lubricants of driving machine motor vehicle or be automatic transmission sap pressure supply liquid.Preferably, the described pump of described internal combustion engine drive.
Described reciprocating pump also comprises modulating valve, and by means of this modulating valve, the demand of the assembly that the delivery volume of described pump can be supplied according at least one needs is regulated, and therefore can preferably reduce to drive the energy of this pump.Modulating valve comprises valve casing, the valve piston that can move, valve spring and regulating equipment in valve casing.Valve piston comprises the actuation surfaces (active surface) of fluid valve actuation pressure.Described valve spring is arranged to make it to act on the valve piston, do as a whole with act on valve body on the valve actuation pressure opposite.
In a preferred embodiment, delivery volume is understood that the specific volume flow of pump self---under the situation of rotary pump, be the volume flow of revolution, and be the volume flow of every stroke under the situation of reciprocating piston pump.Although be not most preferred, pump can also be constant pump (constant pump), and modulating valve can be used as the high pressure side that bypass valve is disposed in pump, so as with the FLUID TRANSPORTATION of excessive conveying in reservoir vessel, avoid described at least one assembly.Such bypass is carried the energy consumption that can not reduce pump, but but can guarantee conveying according to demand.In such embodiments, control or adjustment is not the delivery volume in the outlet port of conveying chamber according to demand, but is delivered to the delivery volume of described at least one assembly.By the volume flow of utilizing according to the present invention or the modulating valve of alternate manner is regulated revolution or every stroke, and be branched and the part that be not used of the volume flow that will carry by pump in the downstream of pump and the upstream of the assembly that is supplied turn back to reservoir vessel, the pump that can regulate self delivery volume can be combined with bypass valve.
In a preferred embodiment, as what directly see from the outlet port of conveying chamber, self delivery volume of pump is regulated by modulating valve.In these embodiments, actuation element is arranged in the pump case movably, and can manage on the direction of its movable (mobility) at the actuation force that bears the demand that depends on described at least one assembly on its activity direction.Actuation element specifically is set in the face of the positive of delivery element or around delivery element.In first kind of distortion, actuation element and delivery element are the parts of regulon, wherein said regulon can move forward and backward as an integral unit in pump case, for example can linear move or otherwise pivoted or mobile regulon, transverse to the running shaft that is preferably rotatable delivery element.For instance, the example of this regulon is described in US 6 283 735 B1 and is used for outer shaft pump (external-axle pump), in US 6 126 420 and US 6 244 839 B1, be described be used in the axle pump (internal-axle pump), be used for two types pump and in EP 1 262 025 A2, be described.In second kind of distortion, actuation element can be regulated with respect to delivery element and pump case.Actuation element in second kind of distortion specifically can be the actuating ring around delivery element, as known in comprising the wing pump of vane pump, swing type shuttle block pump (pendulum slider pump) and internal gear pump, so as for example by actuation element linear back and forth or pivotal movement regulate off-centre with respect to delivery element.
Actuation force preferably fluid ground produces, because actuation element is formed with the power piston that bears pressure fluid.This pressure fluid can be branched in the high pressure side of pump specifically and return actuation element as the shunting of the volume flow of being carried by pump via modulating valve, and described volume flow of being carried by pump is done as a whole.But in principle, the pressure fluid that actuation element bore can also be an one other fluid, for example from the pressure reservoir vessel or from the fluid of another pump supply.
In the another kind distortion, the shunting of fluid is back to low voltage side by modulating valve and enters conveying chamber, and is so that increase the fill level of conveyor chamber wherein, for example disclosed in US 6 935 851 B2.Be back to and fill conveyor chamber and also regulate simultaneously delivery volume, wherein such adjusting can with other type of quoting before in one combine and realize.
According to the present invention, regulating equipment is formed and makes it can be on the direction that is applied to the power on the valve body by the valve actuation pressure or at the direction adjusted valve piston opposite with the valve actuation pressure.It is preferably by electromagnetism work.Identical with other place here, word " or (or) " comprises the implication of " not being ... be exactly ... (either ... or ...) " and the implication of " with (and) " in meaning of the present invention, as long as the implication that limits according to corresponding contents not necessarily.Thereby, regulating equipment can be constructed to make it only to offset the valve actuation pressure or preferably only offset the power of valve spring on identical direction, and replacedly, it can also be constructed to make it both can be along also can be at direction adjusted valve piston in contrast on the direction of valve actuation pressure.
In first preferred embodiment, valve actuation pressure and by the power one that regulating equipment the is applied to valve piston opposing valve spring power that works.If the valve actuation pressure increases, then valve piston can be conditioned by the relative less power of the regulating equipment opposite with valve spring power.
In second preferred embodiment, regulating equipment both is constructed on the direction of valve actuation pressure also at the direction adjusted valve piston opposite with the valve actuation pressure.If regulating equipment is for only comprising the magnetic regulating equipment of an independent magnetic coil, then in these embodiments, the polarity of magnetic coil can be reversed.Replacedly, can on each direction in two activity directions of valve piston, provide a dedicated magnetic coil, each coil all comprises armature, and one in these armatures applies power to valve piston on an activity direction of piston, and another armature applies power on valve piston on another activity direction of valve piston, so that move forward and backward valve piston.
At least in a second embodiment, preferably equally in first embodiment, therefore the position of valve piston can be regulated and have nothing to do in the valve actuation pressure that acts on the actuation surfaces with respect to valve casing, therefore can set the delivery volume of pump.Therefore modulating valve can be set delivery volume adaptively in the bigger operating range of the assembly that is supplied, constantly or as required increment is adjusted the specified pressure that drops to and not only be adapted to delivery volume.
The control apparatus or the adjustment equipment that are used for this modulating valve are constructed such that preferably delivery volume can utilize this modulating valve to regulate adaptively in the whole operation scope of assembly.On the contrary, the valve actuation pressure of the power of valve spring and lasting opposing valve spring valve has guaranteed the reliable supply to assembly, even---under the situation that regulating equipment lost efficacy---only adjust delivery volume, as known in traditional reciprocating pump according to the spring constant of bias force and valve spring.Even the present invention will combine with the security of supply that can both guarantee when regulating equipment lost efficacy to the accurate and flexible adaptability of demand; It provides so-called secondary control or secondary adjustment to delivery volume.
Regulating equipment is preferably Proportional valve.It is preferably automatically controlled.Described regulating equipment is magnetically effect preferably.It can comprise the ratio magnetic coil, and this ratio magnetic coil is that Control of Voltage or voltage are adjusted or Current Control or electric current adjustment, promptly changes voltage or the electric current that is applied by the demand according to described at least one assembly.In other preferred embodiment, modulating valve is by modulating pulse control or adjustment.When using the Sampling modulating valve, can change the endurance of the individual pulse that activates variable or the time lag between two continuous impulses, it also comprises such a case, i.e. the time lag between the endurance of pulse or two continuous impulses all changes according to demand.The endurance in cycle that activates variable is preferably constant.Preferably, use the pulse duration modulation modulating valve.The endurance in cycle of the actuating variable of modulating valve obviously is less than the minute constant (deteming time constant) of the reciprocating pump that is used to regulate delivery volume.Sampling has utilized the low-pass characteristic of pump.On time by changing pulse duration modulation according to demand or change the time lag under the situation of PFM Pulse Frequency Modulation is by the flow of modulating valve and therefore the delivery volume of reciprocating pump is can be almost controlled or adjust according to the electric current demand of assembly constantly.
Modulating valve is preferably and comprises at least three ports, the manifold valve of four ports preferably.It can preferably be changed at least two dislocations, preferably changes at least three dislocations.
In a preferred embodiment, modulating valve is according to the nominal value of the nominal value of the volume flow that will be carried by reciprocating pump or the fluid supply pressure that will be generated by reciprocating pump and controlled or adjust.The nominal value that presets pre-determines the control apparatus that is provided for modulating valve or the nominal value of regulating equipment.Nominal value preferably changes according to the demand of assembly.Preferably, characteristic diagram is that the nominal value that depends on the assembly operation state pre-determines.Described at least one nominal value or preferably a plurality of nominal value pre-determine according to physical descriptor, and described physical descriptor is the feature of serviceability and is to rely on detection facility to use sensor to find out in the operating process of assembly to obtain.Described at least one physical descriptor specifically can be the load condition of temperature, rotational speed or assembly.Preferably, one or more nominal values of volume flow or fluid supply pressure pre-determine according at least two variablees that embody the assembly operation status flag.If reciprocating pump is used as the lubricating pump of internal-combustion engine, for instance, the temperature of the cooling liquid in the temperature of lubricant oil or the part of internal-combustion engine or rotational speed or the position of accelerator pedal or throttle valve can utilize sensor to detect---for load condition---, and corresponding nominal value can be determined on the basis of characteristic diagram and can be determined in advance at control apparatus that is used for modulating valve or adjustment equipment thus.
In first preferred embodiment, modulating valve is only controlled according to each nominal value.The step that detects the actual value of the physical descriptor that forms nominal value is omitted, any well-designed process that is used for the adjustment carried out on the basis of nominal value/actual value comparison also is omitted, wherein said physical descriptor is the representative of described demand, i.e. volume flow or fluid supply pressure.
In same preferred second preferred embodiment, modulating valve is relatively adjusted according to each nominal value of volume flow or fluid supply pressure and the nominal value/actual value between the actual value, and described actual value measures continuously or in an enough short time lag.It is favourable adjusting under following situation, has promptly changed the demand of the volume flow of assembly in the working life of assembly owing to loss.
In two embodiments' selectable combination, provide the calibration equipment that can become from control according to second embodiment's adjustment according to first embodiment, if wherein preferably modulating valve is at first controlled according to predetermined volume flow, owing to the leakage that causes along with component wear forms loss, it becomes the pressure adjustment subsequently.In another embodiment, provide the adaptability calibration equipment, this equipment can be measured the increase of wearing and tearing and change the characteristic diagram of nominal value or nominal value with at least one increment or a plurality of incremental adaptations ground on the basis of using sensor volume flow or fluid supply pressure, as continuance of application in the working life of assembly.
In a further advantageous embodiment, modulating valve is on the one hand controlled and adjusted by electric current in addition on the basis of the characteristic diagram of the nominal value of fluid supply pressure or volume flow or nominal value.Especially preferred embodiment is for by means of pulse duration modulation controlled and modulating valve that regulated by electric current in addition on the basis of the characteristic diagram of the nominal value of fluid supply pressure or volume flow or nominal value.The change of the resistance of magnetic regulating equipment is advantageously come balance by electric current adjustment.The electric current that obtains in the magnetic regulating equipment is detected, and the change that changes the electric current magnitude produces owing to resistance is by according to the variation adjustment duty of obtaining electric current balance recently.But correspondingly, this not only can carry out in the preferred embodiment as the pulse duration modulation modulating valve, can also carry out in the modulating valve of otherwise control.Regulate by beyond controlling on the basis of the characteristic diagram of the nominal value of volume flow or fluid supply pressure or nominal value, also carrying out electric current, can omit adjustment, although or even under the situation of electric current adjustment, can use adjustment extraly to volume flow or pressure to volume flow or pressure.
Control apparatus or adjustment equipment can be integration sections of modulating valve, and it can be installed separately with modulating valve.Nominal value presets the target part that can be considered to control apparatus or adjust equipment, perhaps can be objectively thought respectively that other parts with the control apparatus or the equipment of adjustment are separated.Modulating valve is preferably an integration section of reciprocating pump, and it can be installed on the pump case for instance.In described integrated embodiment, modulating valve can advantageously be set in the housing of reciprocating pump equally, for example forms in the holding space in addition in receiving bore or on the wall of pump case.In these embodiments, the port of modulating valve can form the hole in the mode of saving space and saving in weight or form passage in addition in housing, especially on the described wall of housing.Therefore, pump case can form valve casing equally simultaneously or only form the part of valve casing.
In the embodiment that the delivery volume of pump is directly regulated, advantageously, if actuation element is formed the two-way function power piston that comprises two piston faces, wherein said two piston faces opposing each other vertically and away from and preferably along opposite direction opposing each other and away from, and no matter be this or another piston face or also can be two piston faces, can bear the pressure fluid of pressurization by modulating valve.
If actuation element forms the power piston that can bear pressure fluid, for example only can bear the piston of pressure fluid or two-way function piston preferably in a side, then in a preferred embodiment, it bears the spring force that is applied by pump spring, and wherein pump spring acts on the direction of the delivery volume that increases pump.If actuation element forms the two-way function piston, if thereby preferably pump spring is enough weak makes the adjusting dynamic characteristic of pump can not influenced fatefully by pump spring, but ad hoc or at least to a large extent influence by deciding property of modulating valve ground.In such embodiments, can also omit pump spring in principle.On the contrary, it is favourable using more weak pump spring, and wherein this pump spring is constructed such that it only can guarantee when reciprocating pump moves under low speed, can transfer pump under this speed maximum delivery volume.Pump spring applies corresponding to the spring force of the hydrodynamic pressure of maximum 1 bar just enough on actuation element.
Be directed to by modulating valve for the purpose of regulating---controlled or be adjusted---to the fluid of reciprocating pump or when modulating valve only is used as bypass valve from being divided to the fluid of reservoir vessel, preferably when it flows through modulating valve, produce the valve actuation pressure.In such embodiments, do not need to be used to produce the independent port of valve actuation pressure.Enter the port that the identical port of inlet that this modulating valve passes through can form the fluid that produces the valve actuation pressure equally with the fluid that flows through modulating valve.
If preferably the valve actuation pressure produces by a plurality of actuation surfaces, preferably accurately be two actuation surfaces, wherein there is difference in these actuation surfaces in following this mode dimensionally, and this mode makes the valve actuation pressure apply different power according to the different area of actuation surfaces on valve piston.The feature of different power especially preferably combines with supplementary features, and according to described supplementary features, fluid produces the valve actuation pressure when flowing through modulating valve.
In a kind of development was widened, when the reciprocating pump conveyance fluid, the bias force of valve spring can be conditioned, and is conditioned with being preferably fluid.So described modulating valve can comprise another piston that preferably only is used to set bias force, and this piston preferably bears the fluid that also produces the valve actuation pressure, wherein can provide the port of separation for the piston that is used to regulate bias force or the power that preferably acts on this regulating piston can be produced by the fluid of the process that flows.
Favourable feature equally below dependent claims and in conjunction with in be described.
Description of drawings
Below one exemplary embodiment of the present invention are made an explanation on the basis of accompanying drawing.The disclosed feature of exemplary embodiment, any combination of each independent feature and feature has advantageously developed claim and previously described embodiment's theme.Shown in it be:
Fig. 1 is the cross section of reciprocating pump;
Fig. 2 is the longitudinal section of reciprocating pump;
Fig. 3 is the reciprocating pump that comprises the modulating valve of the delivery volume that is used to regulate pump;
Fig. 4 is with the modulating valve shown in the legend; And
Fig. 5 is the longitudinal section of modulating valve.
Embodiment
Fig. 1 shows the cross section of reciprocating pump (displacement pump).In pump case 1, be formed with and comprise inlet 2 that is positioned at low voltage side and the conveying chamber that is positioned on high-tension side outlet 3.First delivery element 4 and second delivery element 5 are arranged in the conveying chamber movably. Delivery element 4 and 5 is carried joint each other.When delivery element 4 and 5 was driven under the conveying jointing state, they carried out such conveying campaign, promptly sucked in the conveying chamber and with it by 2 fluids with for example lubricant oil or hydraulic fluid that enter the mouth and discharged from exporting 3 with higher pressure.Delivery element 4 is driven, and is carrying driving delivery element 5 under the jointing state.
Reciprocating pump in the exemplary embodiment is an external gear pump.Therefore, delivery element 4 and 5 is the conveying solid of rotation with exterior periphery tooth, and described conveying joint is indented joint.Delivery element 4 and 5 is installed to be and makes that they can be respectively around running shaft R4 and R5 rotation.When they were driven in rotation, the fluid that is sucked 2 was transferred from entering the mouth, and enters the formed conveyor chamber of each backlash by delivery element 4 and 5, passes so-called leg 1a, and is discharged from by exporting 3.
For the delivery volume that can make pump adapts to the requirement of the assembly will be supplied fluid, the axial length---bonding length---that can engage the conveying of the delivery element 4 that measures along running shaft R4 and R5 and 5 is adjusted.For adjusting, delivery element 5 can be axially to move forward and backward with respect to delivery element 4 and pump case 1 between the position of maximum delivery volume and the position that minimum bonding length is the minimum delivery volume at maximum bonding length.
Fig. 2 shows the longitudinal section of described reciprocating pump.Delivery element 4 non-rotatably is fastened on the live axle, and described live axle stretches out and is supported with the driving wheel that is used for driven pump from pump case 1.Delivery element 5 is the part of regulation unit, and this regulation unit also comprises except delivery element 5 by two power pistons 6 and 7 actuation elements of forming.This regulation unit 5-7 can be used as a complete unit and moves forward and backward vertically in pump case 1, so that can adjust bonding length.Delivery element 5 is arranged between power piston 6 and 7 vertically.Actuation element 6,7 so assembling delivery element 5 can rotate it around spin axis R5.Regulation unit 5-7 is housed inside in the cylindrical cavity of pump case 1.Described cavity is that the motion of regulon 5-7 forms axial track.It also forms a pressure space 8 on the axle side of regulation unit 5-7, and forms another pressure space 9 at opposite side.Except that owing to leak the inevitable loss cause, power piston 6 with 7 with pressure space 8 with 9 each other fluid ground separate and they separated with conveying chamber fluid ground.In the exemplary embodiment, pressure space 8 and 9 can be pressurizeed by pressure fluid respectively, and described fluid is carried by reciprocating pump.Pump spring 10 is set in the pressure space 9, and the spring force of wherein said spring is along acting on the direction of maximum bonding length on the regulon 5-7, promptly on the power piston 7.
Fig. 3 shows the reciprocating pump in the enclosed circulation of fluid that is combined in motor vehicle lubrication oil circulation for example.Circulation of fluid comprises reservoir vessel 11, pump passes through inlet 2 draw fluid from this reservoir vessel 11 in low voltage side, and with its in the high pressure side with high pressure by export 3, attached supply line 12 and be transported to assembly 14 places that need the fluid supply by cooling and the cleaning equipment 13 that comprises cooler and filter, for example be used for the internal-combustion engine of driving machine motor vehicle.In the downstream of assembly 14, fluid turns back in the reservoir vessel 11 by pipeline 15.
In the downstream of cooling and cleaning equipment 13, be the downstream of the purification part of cooling and cleaning equipment 13 specifically, but still in the upstream of assembly 14, the shunting 16 of fluid is bifurcated and return pump via modulating valve 20.Modulating valve 22 comprises inlet, the outlet that is shorted to reservoir vessel 11 and two other ports of shunting 16, and one of them port is connected to pressure space 8 via pipeline 18, and the another port is connected to pressure space 9 via pipeline 19.Modulating valve 20 is the multitube changing valve.In first dislocation, its guiding shunting 16 enters pressure space 8 and pressure space 9 is connected to reservoir vessel 11, that is, it is connected to pressure space 9 in the external pressure.In second dislocation of the modulating valve 20 that Fig. 3 adopted, it enters pressure space 9 by guiding shunting 16 and makes pressure space 8 and reservoir vessel 11 short circuits (shorting) make these condition counter-rotatings.Modulating valve 20 in the exemplary embodiment can adopt three dislocations, two positions and a neutral position of just enumerating previously, make that pressure space 8 is separated from one another with 9 and make them separate with shunting 16 at this neutral position adjusted valve 20 with reservoir vessel 11, remove like this owing to leak outside the loss that spills and supervene that causes, the pressure separately in the pressure space 8 and 9 remains unchanged.In the exemplary embodiment, can select three-position four-way valve (4/3-port valve) as modulating valve 20.
Fig. 4 shows modulating valve 20 among Fig. 3 with legend, but is the method for expressing to amplify.Four ports of modulating valve 20 are illustrated, and wherein are used to shunt 16 inlets that reflux and represent with I, represent with O to the outlet of reservoir vessel 11, and the port that is used for pressure space 8 represents with A, and the port that is used for pressure space 9 is represented with B.
Modulating valve 20 is a Proportional valve, and the valve actuation pressure P20 that it demonstrates the fluid of homeostatic process just shunt in 16 the pressure of the fluid that is refluxed, and it comprises the valve spring 25 that is set for opposing valve actuation pressure P20.When modulating valve 20 was working properly, the valve actuation pressure P20 of fluid and the power of valve spring 25 can not be determined the position of conversion separately.Modulating valve 20 comprises the regulating equipment as Proportional valve, and this regulating equipment is according to the fluid demand of assembly 14 and modulating valve 20 is transformed in another dislocation from a dislocation.If the ratio regulating equipment lost efficacy, then valve actuation pressure P20 and valve spring 25 make modulating valve 20 have the fail safe characteristic.
Regulating equipment is the magnetic regulating equipment that is connected to the electronically actuated signal of pulsewidth modulation.Actuated signal is generated by the form of control apparatus with rectangular signal, and described rectangular signal has last signal level and the following signal level and the specific endurance in cycle of constant for example voltage level.The endurance of last signal level is that the endurance of on time (on-time) and the following signal level that causes thus is can change according to pulsewidth modulation turn-off time (off-time).The magnetic force of regulating equipment changes according to the dutycycle of actuated signal, and this dutycycle is the ratio between on time and endurance in the cycle t.The dislocation of modulating valve 20 can from equilibrium of forces and two reaction forces of the power of valve spring 25, i.e. fluid force and the magnetic force that produces by valve actuation pressure P20, in draw.Valve actuation pressure P20 is big more, and is then just more little with the corresponding magnetic force of equilibrium of forces.If the summation of fluid force and magnetic force has surpassed spring force, then valve piston 22 moves on the direction of first dislocation, and the delivery volume of reciprocating pump is conditioned.If the power of valve spring 25 is preponderated, then valve piston 22 moves to second dislocation, and therefore regulon 5-7 moves on the direction of maximum delivery volume.
In a kind of improvement, are assigned on time and turn-off time first and second dislocations of modulating valve 20.When the modulating valve proper functioning, the position of valve piston 22 and therefore the dislocation of modulating valve 20 be not subjected to the influence of valve actuation pressure P20.Mode by example it is contemplated that, in each on time, modulating valve 20 adopts first dislocation, and the fluid reflux of shunting 16 is to pressure space 8 on this position; And in each turn-off time, modulating valve 20 adopts second dislocation, at the above fluid reflux of this position to pressure space 9.
Because endurance in the cycle t of actuated signal is shorter than the crash time constant of pump significantly,, in two embodiments, all can change the flow that flow to each pressure space 8 or 9 by modulating valve 20 in fact constantly by changing on time and turn-off time.Therefore, can change pressure in the pressure space 8 and the pressure in the pressure space 9 equally constantly.
Regulon 5-7 therefore can be along its axial adjustment path movement and be maintained on any axial position.Therefore delivery volume can adapt to the fluid demand of assembly 14 constantly flexibly and accurately between minimum and maximum delivery volume.
In be provisioning component 14 according to demand, characteristic diagram is stored in the control system of assembly 14---being engine control system in the exemplary embodiment---the electricity or optics storage.For each serviceability of the assembly relevant 14 with fluid demand, characteristic diagram comprise fluid supply pressure P14's or in each serviceability the predetermined nominal value of assembly 14 desired volume flow V14.These volume flow nominal values or pressure nominal value are stored in the characteristic diagram according to the physical descriptor that characterizes serviceability, and wherein said serviceability can be distinguished according to fluid demand.Temperature T, rotational speed D and load L quotability are as the example of physical descriptor.Assembly 14 comprises the physical descriptor that is used to detect one or more sign different operating states.For instance, at the cooling fluid that is used for cooling package 14 or in the fluid of being carried by pump 3, temperature T can measure on the critical localisation of assembly 14.Rotational speed D can detect at an easy rate by tachometer, and the position of load L by accelerator pedal or throttle valve also can detect at an easy rate.According to detected variable, default nominal value is selected the pressure nominal value or the volume flow nominal value of formulation on the basis of characteristic diagram, and sends it in the control apparatus of modulating valve 20.Control apparatus forms actuated signal according to current flow ratings, i.e. ratio between on time and endurance in the cycle t.As long as the actual flow demand of assembly 14 is corresponding with nominal value, then need be by means of Moderator Variable the feedback of---being the fluid supply pressure P14 that measures or the actual value of volume flow V14 in present case---.
Control on the basis of nominal value especially can be replenished by the electric current regulated quantity.Electric current is regulated the change of the resistance specifically be used to compensate the magnetic regulating equipment, the change of the resistance that takes place during as temperature change especially, and the electric current that wherein obtains in regulating equipment is detected and be retained as a particular current by detection facility.If detection facility detects the variation of the electric current that is obtained and the resistance variations of corresponding regulating equipment, then dutycycle is changed by this way, and this mode makes that the electric current that is obtained is corresponding with resistance variations current value before once more.
If the real fluid demand of assembly 14 changes and depart from from the nominal value of characteristic diagram,, also provide adjustment equipment for modulating valve 20 for example owing to the wearing and tearing in the life time of assembly 14 cause.Described adjustment equipment is formed for the actuated signal of modulating valve 20 according to the nominal/actual value comparison based on assembly 14 required fluid supply pressure P14 or volume flow V14.Adjustment equipment can use storage, and other nominal value of pressure P 14 or volume flow V14 is stored in this storage with the form of the characteristic diagram that can compare with the characteristic diagram that up to the present is used to control.The characteristic diagram of pressure nominal value or volume flow nominal value can be stored in the zones of different of physically different storagies or same storage.Provide senior calibration equipment (superordinate checking device) simultaneously, the demand that detects assembly when it has fully been changed when having made the characteristic diagram of nominal value can not fully describe actual demand, when for example increasing demand owing to wearing and tearing, the part of the control apparatus that this senior calibration equipment can be pressure or volume flow or the equipment of adjustment and the control of change to adjusting.Comparison for nominal/actual pressure, for instance, actual main fluid supply pressure P14 can or---in the example at internal-combustion engine---go up measured obtaining at engine pipeline (engine gallery) on the position in the downstream of the consumption on the assembly 14, and can with all very crucial pressure nominal value of each serviceability is compared, for example compare by the difference of seeking between nominal value and the reality.
As described, pressure or volume flow do not controlled and to be developed into by using separately pressure nominal value or volume flow nominal value relatively to adjust pressure or volume flow with the nominal value/actual value between the actual value that records for comparison by feedback by example.A plurality of characteristic diagrams of volume flow V14 or fluid supply pressure P14 can be stored in advance, these characteristic diagrams have been described the demand on the different time points of assembly 14 in Life cycle, for example for first n kilometer of motor vehicle or the characteristic diagram of n hours run of assembly 14, the ensuing m kilometer of vehicle or ensuing m hours run of assembly or the like.In this embodiment, can on the kilometer reading of for example vehicle or the basis of record of operation endurance, be changed to next characteristic diagram etc. from the characteristic diagram that at first uses.Finally, control apparatus equally can be according to the state of assembly 14, preferably change the nominal value of characteristic diagram according to each state of assembly 14, so that can come regulating and controlling valve 20 based on the characteristic diagram after changing respectively.Advantageously, the nominal value of characteristic diagram is automatically changed, or one or more predefined characteristic diagrams are automatically selected, for example according to kilometer reading of quoting before or operation endurance, or compare according to test fluid supply pressure P14 and with the predetermined nominal value of itself and characteirstic element diagram form, wherein such nominal value/actual value relatively can be used to adjust the pressure of modulating valve 20, but preferably it only is used to select to be used to or changes the pressure nominal value of an independent predefined characteristic diagram or the Pressure characteristics of volume flow nominal value is wanted sketch map or volume flow characteristic diagram, to be used for control.
In Fig. 3 and 4, another shunting 17 was branched out before modulating valve 20 from the shunting 16 that is refluxing, so that produce valve actuation pressure P20, and the also change thereupon of the valve piston of modulating valve 20, opposite with valve spring 25.
Fig. 5 shows the longitudinal section of carrying out improved modulating valve 20 with respect to generation valve actuation pressure P20.Different with the modulating valve among Fig. 4, valve actuation pressure P20 produces by additional shunting---shunting 17 among Fig. 3 and 4---, but produce by controlled or controlled shunting 16 through-flow.Remove these and improve, be equally applicable to improved modulating valve 20 about the statement of the modulating valve 20 of Fig. 3 and 4, and the statement of this aspect equally also is suitable for the modulating valve 20 of Fig. 3 and 4.
Modulating valve 20 comprises valve casing 21 and the valve piston 22 that can axially move forward and backward along centre valve axis S in valve casing 21.Also show the magnetic coil 27 and the armature 28 of the regulating equipment that forms by soft iron.Show the magnetic coil 27 and the armature 28 of the controlling device that forms with soft iron.Also show the electric contact of magnetic coil 27 simultaneously.Magnetic coil 27 is fixedly connected on the valve casing 21 and around described armature 28.Thereby armature 28 is connected to it can not be moved axially, and valve piston 22 and armature 28 are done as a whole execution and moved axially like this.
Valve piston 22 comprises first actuation surfaces 23 and second actuation surfaces 24 that is used for valve actuation pressure P20.Axially limit fluid space 26 and boths' actuation surfaces 23 and 24 face with each other together.Actuation surfaces 23 is greater than actuation surfaces 24, and valve actuation pressure P20 resists valve spring 25 on this actuation surfaces 23, and wherein in Fig. 5, both ratios are by exaggerative.In fact very little of both size difference, but be restricted to the differential force that makes valve actuation pressure P20 on valve piston 22, apply the power of and opposing valve spring 25 corresponding constantly with the difference in size of actuation surfaces 23 and 24.Since valve piston 22 can be very accurately according to actuation surfaces 23 and 24 different manufacturing of size, therefore described differential force can be correspondingly less and valve spring 25 also can be advantageously than more soft in the exemplary embodiment of Fig. 4.Regulating equipment 27,28 correspondingly requires less power.Modulating valve 20 is done as a whole more responsive, and also can be reduced the conversion time of modulating valve 20.
In all dislocations of modulating valve 20, lead to fluid space 26 corresponding to the inlet I of the fluid of wanting controlled or adjusting.In the corresponding dislocation of dislocation of the modulating valve 20 in shown and Fig. 3 and 4, port B leads to fluid space 26, and valve piston 22 with fluid space 26 and the I that therefore will enter the mouth separate with another port A.Shunt 16 fluid and therefore be back in the pressure space 9, and pressure space 8 is connected to reservoir vessel 11 via port A and therefore is not connected with pressure.In this dislocation, port A is connected to outlet O via the space that is provided with valve spring 25 in the valve casing 21, and is connected to reservoir vessel 11 via outlet O.Magnetic coil 27 is supplied electric current and shifts armature 28 in the axial direction---to become high signal level from low-signal levels in the exemplary embodiment---if actuated signal has been changed its signal level, opposite with the power of valve spring 25, at first armature is transferred to the intermediate conversion position, given one period correspondingly long on time, arrive in another limit dislocation first dislocation.In the intermediate conversion position, valve piston 22 is separated two port A and B and fluid space 26, and the I that wherein enters the mouth still leads to this fluid space 26.In first dislocation, valve piston 22 takes an axial position to make fluid space 26 axially all overlapping with inlet I and port A, and valve piston 22 fluid ground on described axial position separates port B with fluid space 26 fluid ground simultaneously.In first dislocation, shunting 16 fluid is guided through fluid space 26 and port A, enters pressure space 8, and pressure space 9 by valve piston 22 port B and port C be connected to outlet O and go up and finally be connected on the reservoir vessel 11.
Described valve piston 22 is hollow.Hole C be formed at valve piston 22 on the direction of armature 28 near on the cyclindrical surface region of actuation surfaces 24, and its circumferential surface with valve casing 21 forms the narrow sealing off gap that regulating equipment 27,28 is separated with fluid space 26 fluid ground.The cyclindrical surface region of valve piston 22 equally radially is attached on the actuation surfaces 23 in the outside and away from regulating equipment 27,28, and as long as modulating valve 20 does not adopt first dislocation just to form another narrow sealing off gap with valve casing 21, valve piston 22 adopts fluid space 26 and the overlapping axial position of port A on this primary importance.
The regulating equipment 27,28 that comprises specified control equipment connects modulating valve 22 in the whole operation scope of assembly 14, and control or adjust the axial position of regulon 5-7, and therefore in the gamut inner control of provisioning component 14 desired volume flows suitably or adjust the delivery volume of reciprocating pump.If regulating equipment 27,28 or specified control equipment were owing to fault lost efficacy, for example because cable disconnects or power plug connects separately, then the valve actuation pressure P20 of fluid and valve spring 25 can be used as standby management.Modulating valve 20 is constructed to make and occurring under the situation about losing efficacy, in case the fluid supply pressure P14 that reaches greater than the maximum fluid supply pressure P14 that when modulating valve 20 is working properly, sets, then the delivery volume of pump is only regulated from being up to minimum direction.For this purpose, valve spring 25 is installed to be to have than being applied to the bigger bias force of power on the valve piston 22 at the maximal valve actuation pressure P20 that passes through that sets under the situation of proper functioning.
Reference numbers
1 pump case 1a leg
3 outlets of 2 entrances
4 delivery elements, 5 delivery elements
6 power pistons, 7 power pistons
8 pressure spaces, 9 pressure spaces
10 pump springs, 11 reservoir vessels
12 pipelines, 13 cooling and cleaning equipments
14 assemblies, 15 pipelines
16 shuntings, 17 shuntings
18 pipelines, 19 pipelines
20 modulating valve, 21 valve casings
22 valve pistons, 23 actuation surfaces
24 actuation surfaces, 25 valve springs
26 fluid spaces, 27 magnetic coils
28 armature A ports
B port C hole
I inlet O outlet
The S valve axis t endurance in cycle
D rotational speed L load
T temperature P
14Fluid supply pressure
V
14Volume flow P
20The valve actuation pressure
R
4Spin axis R
5Spin axis
Claims (28)
1, a kind of modulating valve that is used to regulate the delivery volume of reciprocating pump, described modulating valve comprises:
A) valve casing (21);
B) valve piston (22) is installed to be it can be moved in described valve casing (21), and comprises the actuation surfaces (23) of the valve actuation pressure (P20) that is used for fluid;
C) valve spring (25), opposing is applied to power on the described valve piston (22) by described valve actuation pressure (P20); And
D) regulating equipment (27,28), by this regulating equipment, described valve piston (22) can on the direction of the power that applies by described valve actuation pressure (P20) or with the direction opposite by described valve actuation pressure (P20) applied force on be conditioned.
2, according to the described modulating valve of last claim, it is characterized in that having at least one in the following characteristics:
-described regulating equipment (27,28) is an electrically actuatable;
-described regulating equipment (27,28) is formed the magnetic regulating equipment;
-described regulating equipment (27,28) is resisted the power of described valve spring (25).
3, according to the described modulating valve of aforementioned arbitrary claim, it is characterized in that having at least one in the following characteristics:
-described modulating valve (20) is a Proportional valve;
-described modulating valve (20) is by modulating pulse, preferably controlled or adjusted by duration-modulated pulse;
-described modulating valve (20) be Current Control or electric current is adjusted;
-described modulating valve (20) is voltage-controlled or voltage is adjusted;
-described modulating valve (20) comprises at least three ports that are used for fluid, and (A B), preferably has four ports for I, O;
-described modulating valve (20) can be between at least two dislocation, preferably change between three dislocation;
-described modulating valve (20) is a port valve.
4, according to the described modulating valve of aforementioned arbitrary claim, it is characterized in that, comprising:
-control apparatus or adjustment equipment, the volume flow (V14) that is used to control or adjust the fluid supply pressure (P14) that will produce by described reciprocating pump or will carries by described reciprocating pump; And
-nominal value presets, and is used to pre-determine at least one pressure nominal value or volume flow nominal value, is preferably the nominal value that changes in predetermined mode;
-wherein, described control apparatus or adjustment equipment are according to described nominal value control or adjust described regulating equipment (27,28).
5, according to the described modulating valve of aforementioned arbitrary claim, it is characterized in that, comprising:
-adjustment equipment, being used to adjust will be by the fluid supply pressure (P14) of described reciprocating pump generation;
-nominal value presets, and is used to pre-determine the nominal value of fluid supply pressure (P14), is preferably the nominal value that changes in predetermined mode; And
-sensor is used to survey the actual value of described fluid supply pressure (P14);
-wherein, described adjustment equipment is with described actual value and described nominal value compares and control described regulating equipment (27,28) according to result relatively.
6, according to the modulating valve of the combination of aforementioned two claims, it is characterized in that, comprise calibration equipment, by this calibration equipment, described modulating valve (20) can become adjustment described fluid supply pressure (P14) or described volume flow (V14) from controlling described fluid supply pressure (P14) or described volume flow (V14).
7, according to the described modulating valve of aforementioned arbitrary claim, it is characterized in that, described valve spring (25) is biased and applies bias force on described valve piston (22), described bias force is greater than being applied to power on the described valve piston (22) by the valve actuation pressure (P20) of maximum when described regulating equipment (27, the 28) proper functioning.
8, according to the described modulating valve of aforementioned arbitrary claim, it is characterized in that, described valve piston (22) comprises that another is used for the actuation surfaces of valve actuation pressure (P20) (24), and described actuation surfaces (23,24) be configured to resist each other and be of different sizes, so that generation and described valve spring (25) act on the differential force on the described valve piston (22) on the contrary, and the size difference of this differential force and described actuation surfaces (23,24) is corresponding.
9, according to the described modulating valve of last claim, it is characterized in that, the fluid space (26) that described actuation surfaces (23,24) restriction is identical and on the movable direction of described valve piston (22) toward each other.
According to the described modulating valve of last claim, it is characterized in that 10, described valve piston (22) can move forward and backward between a primary importance and a second place; On the primary importance of described valve piston (22), the inlet (I) and the port (A) that are used to produce the pressure fluid of described valve actuation pressure (P20) lead to described fluid space (26); And on the described second place, described valve piston (22) is separated described port (A) and the described inlet (I) that still leads to described fluid space (26).
According to the described modulating valve of aforementioned arbitrary claim, it is characterized in that 11, described valve casing (21) comprises inlet (I), first port (A) and second port (B) that is used for pressure fluid; Described valve piston (22) can move forward and backward between a primary importance and a second place; And when described valve piston (22) is positioned on the described primary importance, described inlet (I) is connected to described first port (A) and separates with described second port (B), and when described valve piston (22) is positioned on the described second place, described inlet (I) is connected to described second port (B) and separates with described first port (A), so that selectively pressure fluid is guided to described pump via described first port (A) or via described second port (B).
12, a kind of reciprocating pump, it has adjustable delivery volume, and comprises:
A) pump case (1);
B) conveying chamber is formed in the described pump case (1), and is included in the fluid input (2) of the low voltage side of pump and at the on high-tension side fluid output (3) of pump;
C) delivery element (5) can move in described conveying chamber, is used for conveyance fluid; And
D) according to the described modulating valve (20) that is used to regulate delivery volume of aforementioned arbitrary claim, this modulating valve is set in the flowing of the fluid carried by described delivery element (5).
13, according to the described reciprocating pump of last claim, it is characterized in that,
-actuation element (6,7) is set to movably is used to regulate the delivery volume in the described pump case (1) towards the positive of described delivery element (5) or around described delivery element;
-described actuation element (6,7) can bear actuation force on its movement direction, and described actuation force depends on the demand of the assembly (14) that will be supplied fluid;
-wherein said actuation element (6,7) and described delivery element (5) be regulon (5,6,7) part in, described regulon can be done as a whole seesawing in pump case (1), perhaps in actuation element and the described delivery element can be conditioned with respect to another and with respect to described pump case.
According to the described reciprocating pump of last claim, it is characterized in that 14, described pump is a rotary pump, and described delivery element (5) rotates thereby make it can center on running shaft (R5) for being set at the conveying solid of rotation in the described conveying chamber.
15, according to each described reciprocating pump in aforementioned two claims, it is characterized in that, be provided with pump spring (10) to resist described actuation force.
16, according to each described reciprocating pump in aforementioned three claims, it is characterized in that described actuation element (6,7) can bear the on high-tension side fluid of described pump, so that produce described actuation force.
17, according to the described reciprocating pump of last claim, it is characterized in that, described actuation element (6,7) forms the two-way function power piston, and this two-way function power piston comprises the first piston surface and dorsad and away from second piston face on described first piston surface; Pressure fluid can be born via first port (A) of described modulating valve (20) in described first piston surface, be preferably the on high-tension side fluid of described pump, and described second piston face can bear pressure fluid via second port (B) of described modulating valve (20), is preferably the on high-tension side fluid of described pump; And described valve piston (22) can move forward and backward between a primary importance and a second place; Wherein, on the primary importance of described valve piston (22), described modulating valve (20) only guides to pressure fluid described first piston surface, and on the second place of described valve piston (22), described modulating valve (20) only guides to pressure fluid described second piston face.
18, according to each described reciprocating pump in aforementioned five claims, it is characterized in that, described actuation element (6,7) can axially or laterally move with respect to described spin axis (R5) with described delivery element (5) or with respect to described delivery element (5).
According to the described reciprocating pump of last claim, it is characterized in that 19, described delivery element (5) is conveying with another delivery element (4) of described reciprocating pump and engages, so that conveyance fluid.
According to the described reciprocating pump of last claim, it is characterized in that 20, described actuation element (6,7) comprises first power piston (6) and second power piston (7); Described delivery element (5) axially is provided with between described power piston (6,7), and it can move forward and backward with respect to another delivery element (4) under the state of carrying joint as regulon (5,6,7) together with described power piston (6,7).
According to the described reciprocating pump of aforementioned arbitrary claim, it is characterized in that 21, described pump is external gear pump or internal gear pump.
22, according to any described reciprocating pump in the claim 12 to 20, it is characterized in that described actuation element is the actuating ring around described delivery element, described actuating ring can move in a lateral direction with respect to the spin axis of described delivery element.
According to the described reciprocating pump of last claim, it is characterized in that 23, described pump is a wing pump, swing type shuttle block pump or internal gear pump.
24, according to the described reciprocating pump of aforementioned arbitrary claim, it is characterized in that, the fluid of being carried by described reciprocating pump is branched in the high pressure side of this pump, preferably be branched in the downstream of cleaning equipment (13), and this fluid is back to described pump via described modulating valve (20), so that produce described actuation force in pump.
According to the described reciprocating pump of last claim, it is characterized in that 25, the described fluid that is refluxed produces described valve actuation pressure (P20), preferably when described fluid flows through described modulating valve (20), produce.
26, according to the described reciprocating pump of last claim, it is characterized in that, comprising:
-detection facility, be used to detect the fluid demand of the assembly (14) that at least one description will be supplied by described pump physical descriptor (T, D, L);
-nominal value presets, according to described at least one detected physical descriptor (T, D, L), the nominal value of the nominal value of the volume flow that formation will be transferred (V14) or the mobile supply pressure (P14) that will be produced by described reciprocating pump; And
-control apparatus or adjustment equipment are according to the control of described nominal value or adjust the regulating equipment (27,28) of described modulating valve (20).
27, according to the described reciprocating pump of last claim, it is characterized in that, the sensor that comprises the actual value that is used to survey described volume flow (V14) or described fluid supply pressure (P14), wherein said adjustment equipment is according to the actuating variable of the regulating equipment that relatively is formed for described modulating valve (20) (27,28) between described nominal value and the described actual value.
28, according to the described reciprocating pump of aforementioned arbitrary claim, it is characterized in that having at least one in the following feature:
-described pump is used as being used for to internal-combustion engine (14) supplying lubricating oil or to the lubricating pump of automatic transmission sap pressure supply liquid in the vehicle;
-described pump is driven by described internal-combustion engine (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810145866 CN101644259B (en) | 2008-08-07 | 2008-08-07 | Regulating valve used for regulating delivery volume of reciprocating pump |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810145866 CN101644259B (en) | 2008-08-07 | 2008-08-07 | Regulating valve used for regulating delivery volume of reciprocating pump |
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| CN101644259A true CN101644259A (en) | 2010-02-10 |
| CN101644259B CN101644259B (en) | 2013-08-07 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109026890A (en) * | 2017-06-08 | 2018-12-18 | 施瓦本冶金工程汽车有限公司 | Control valve |
| CN110968121A (en) * | 2019-12-20 | 2020-04-07 | 西安文理学院 | Intermediate device for passively regulating flow |
-
2008
- 2008-08-07 CN CN 200810145866 patent/CN101644259B/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109026890A (en) * | 2017-06-08 | 2018-12-18 | 施瓦本冶金工程汽车有限公司 | Control valve |
| CN109026890B (en) * | 2017-06-08 | 2021-03-16 | 施瓦本冶金工程汽车有限公司 | Control valve |
| CN110968121A (en) * | 2019-12-20 | 2020-04-07 | 西安文理学院 | Intermediate device for passively regulating flow |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101644259B (en) | 2013-08-07 |
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