CN101245776B - Magnetic driven metering pump - Google Patents

Magnetic driven metering pump Download PDF

Info

Publication number
CN101245776B
CN101245776B CN200710101636A CN200710101636A CN101245776B CN 101245776 B CN101245776 B CN 101245776B CN 200710101636 A CN200710101636 A CN 200710101636A CN 200710101636 A CN200710101636 A CN 200710101636A CN 101245776 B CN101245776 B CN 101245776B
Authority
CN
China
Prior art keywords
metering pump
stroke
magnetic
magnetic driven
driven metering
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN200710101636A
Other languages
Chinese (zh)
Other versions
CN101245776A (en
Inventor
T·弗雷登伯格
D·A·霍勒
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Excellence Co., Ltd.
Original Assignee
EXCELLENCE DOSE TECHNOLOGY Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by EXCELLENCE DOSE TECHNOLOGY Co Ltd filed Critical EXCELLENCE DOSE TECHNOLOGY Co Ltd
Priority to CN200710101636A priority Critical patent/CN101245776B/en
Publication of CN101245776A publication Critical patent/CN101245776A/en
Priority to HK09100084.8A priority patent/HK1123081A1/en
Application granted granted Critical
Publication of CN101245776B publication Critical patent/CN101245776B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Reciprocating Pumps (AREA)

Abstract

The invention provides a magnetic driving metering pump. A movable pushing part which is fixed on a connecting rod can axially move on a longitudinal shaft in a magnetic cover plate which is fixedly anchored in a pump shell; therefore, after a magnetized coil is driven (started) by getting electricity, the pushing part and the connecting rod overcome the force of a recovery spring and are then pulled into the magnetic cover plate and enter one hole in the magnetic cover plate by reducing the clearance; the pushing part returns to an original position by the recovery spring after the magnet isstopped; therefore, under the continuous starting and stopping of the magnetized coil, the pushing part and an elastic displacement part are driven to carry out vibration; wherein, a diaphragm is alternatively matched with an outlet valve and an inlet valve; a pumping stroke and an injection stroke are generated in a metering head which is arranged along the direction of the longitudinal axis. In the magnetic driving metering pump, a benchmark part is connected with a module which consists of the pushing part and the connecting rod; the position of the benchmark part is detected by a position sensor; wherein, the position sensor provides a practical signal which has a fixed relation with the position of the benchmark part; furthermore, the motion precision of the unit which consists of the pushing part and the connecting rod is controlled by a control circuit so as to meet a prearranged nominal drawing.

Description

Magnetic driven metering pump
Technical field
The present invention relates to a kind of magnetic driven metering pump; In this magnetic driven metering pump; One is fixed on the connecting rod movably, and push mechanism can move axially on the longitudinal axis in the magnetic cover plate that is anchored in the pump case, thus in energising with after driving magnetizing coil, push mechanism and connecting rod overcome the power of recovery springs and quilt is drawn in the magnetic cover plate; Reduce the space and enter into the hole in the magnetic cover plate; And after magnet stops, making push mechanism turn back to initial position through recovery springs, thus continue to start and stop down at magnetizing coil, thus push mechanism and elastic displacement parts are driven and are vibrated; What its septation replaced cooperates with an outlet valve and an inlet valve, in the metering head that is placed on the y direction, produces a pressure stroke and and fills stroke.
Background technique
The magnetic driven metering pump of the sort of type is normally known, and matches with various requirement through the expansion loading.They are used for metered volume, wherein measure through transmitting a closed volume.It is corresponding that the metered volume of each stroke and barrier film move the volume differences that causes.
In this magnetic driven metering pump; One movably push mechanism be loaded on the fixing magnetic cover so that when magnetizing coil was driven, it can insert the magnetic cover; The space is dwindled and the outage after, push mechanism will be resumed the position that spring back into beginning.Connecting rod is fixedly connected with push mechanism, and this motion and power are passed to the flowmeter barrier film.
In simple example, this stroke formula magnet is switched in one section special time to accomplish a metering stroke.In other the example to schedule distribution map to magnetizing coil one tunnel control electric current is provided, magnetic force and the metrological performance that causes thereof all have reproducibility more like this, and do not rely on the for example electrical quantitys such as actual power of power supply.
The frequency of stroke is that the repetition frequency by power pulse provides.But this length of stroke can for example be provided with the axle of the mechanical adjustment of stroke starting point to be changed, and terminal point then provides when the complete shift-in of magnet.In a kind of possible example, a stroke is adjusted bolt by in the screw thread in the precession pump case, and has the calibration knob that can touch from the outside, and the rear end of stroke regulation cock is fixed on the magnetic cover or fixes with respect to the magnetic cover.
The motion of barrier film is because virtuous force action.After switch opens, magnetic current and consequent magnetic force begin slow rising through self-induction; The masterpiece that produces when barrier film is used on the connecting rod and the effect of recovery springs when being overcome, and push mechanism just begins to move.The space dwindles and magnetic force further increases.Cover plate is clashed in the quick acceleration of push mechanism simultaneously, only controls through an O shape ring of common existence.Whole motions all is to occur in several milliseconds, and the result makes and treats that metered dose produces very high instantaneous velocity and the high-pressure peak that meets and exceeds the working pressure of twice.
Barrier film is not a rigidity, but when the working pressure of treating metered dose be on flexible zone the time, the resiliently deformable of a specified quantitative can take place.Amount of deformation can reduce the effective stroke motion and cause working pressure to rise, and metered amount descends.When normal the use, the scope that this specific character suppression ratio measuring accuracy is allowed is more remarkable.Therefore, magnetic driven metering pump can not use in very wide range of working pressure under the prerequisite that guarantees required precision usually, in addition, is aggravated because in further calculating, be used by the error that calibration causes.Yet described calibration measurement must carry out when under actual operating conditions, using, and when especially using corrosive chemical, this is a very step of difficulty.
Existing magnetic driven metering pump only has some simple components and is easy to be made, but in application facet relative narrow limitation is arranged, and compares the influence of the unfavorable factor of fluid power characteristic in the metered process of meeting simultaneously with motor driving pump.Motor driven for example transmits through gear or cam, can be applied in many-sided and in many processes, have better meter characteristic, but operating cost is also expensive more.
Summary of the invention
The objective of the invention is to overcome the unfavorable factor of fluid power characteristic in the metering process and provide a kind of magnetic driven metering pump variable, big operating range not reduce its advantage, promptly make simple, cheap.
The present invention provides a kind of magnetic driven metering pump; Wherein one be fixed on the connecting rod movably that push mechanism can move axially on the longitudinal axis in the magnetic cover plate that is anchored in the pump case; Thereby after energising is with the driving magnetizing coil; Push mechanism and connecting rod overcome the power of recovery springs and are drawn in the magnetic cover plate, reduce the space and enter into the hole in the magnetic cover plate, and after magnet stops, making push mechanism turn back to initial position through recovery springs; Thereby continue to start and stop down at magnetizing coil; Vibrated thereby push mechanism and elastic displacement parts drive, what its septation replaced cooperates with an outlet valve and an inlet valve, in the metering head that is placed on the y direction, produces a pressure stroke and and fills stroke; Wherein the module formed of a reference component and push mechanism and connecting rod connects together; Survey the position of this reference component with a position transducer, wherein position transducer provides one to have the actual signal of fixed relationship with the position of reference component, and the motion of the unit of being made up of push mechanism and connecting rod comes control accuracy by a control circuit so that it meets the nominal figure that is scheduled to.
In addition, push mechanism will be complementary with the details of nominal with the motion of the connecting rod that is attached thereto, and metering process just can be calibrated like this.Simultaneously by making or also can being calculated in interior and by control system compensation correction in addition by the shortcoming that the unfavorable attribute of vibration elastic plate causes.Position indicator also can be configured into, and various assembling differences that when position measurement, produce like this and/or problem just can be by on-board electronics compensation corrections in addition.
This problem is solved by the reference element that links to each other with module that push mechanism and connecting rod are formed; The position of reference element is measured by position transducer; Wherein position transducer provides a position with reference element that the actual signal of fixed relationship is arranged; And the motion of the unit of being made up of push mechanism and connecting rod receives the influence of a control circuit to guarantee control accuracy, so that it follows predetermined nominal distribution map.
Control system is monitored the motion of the push mechanism that links to each other with connecting rod and is moved it according to predetermined motion profile with position transducer.See in this; Condition from nominal; Control system has determined the appropriate motion that will carry out and has used the motion measurement result who obtains from position transducer to control; Influence the magnetizing coil electric current simultaneously so that metering is carried out with possible best way, and for example eliminate the error that the characteristic by barrier film causes.
If position transducer turns round according to contactless principle, so just can guarantee the lossless running of sensor, in reality because a large amount of strokes is useful and also is necessary in the useful life period of metering pump.
The location component of connecting rod is positioned at the end place that faces mutually with metering head and in the outside of metering head, the elasticity about the position transducer space will increase so if be connected with.
If reference element influences the light path of light source; And if be fixed in the magnetic cover and be a sensitization receiver with the position transducer that reference element is worked; So just can guarantee not have the wearing and tearing running; This is very important, because in the useful life period of metering pump, can carry out a large amount of strokes, and the part that moves is not contacted just by inswept.Another benefit of arranging like this is that the such structure of position transducer is insensitive to magnetic field at random basically, and when the sensor that is moving during near magnet this situation be difficult to avoid.
If reference element is the object of a meeting generation shade or the object that shade is provided; And be installed on the position transducer of working with reference element in the magnetic cover and be made up of a series of sensitization electric coupling device, so such device has the important optical characteristics that sensor must satisfy.At first, such device is to work in nothing wearing and tearing optical function principle with under to the insensitive situation in magnetic field at random, the second, and such sensor does not in use have linear discontinuities.
If position transducer is placed on its sensor carrier, this carrier is fixed in the magnetic cover, and such device can be used as a module by assembled in advance and test, thereby makes assembling convenient more.If sensor carrier is made into a kind of nonisulated plastic components, so also can simplify the electrical insulation between sensor element and the magnetic cover.
If the position element, produce the object of shade or provide the profile part and the position transducer of shade to form a device that is similar to light box; If measurement result is continuously input or the stage electronic control system that is input to simultaneously, this device provides position data with a suitable speed to electronic control system.
If the optical receiver of position transducer is made up of the receiver (pixel) of many linear arrangement; Preferred 128 pixels; This sampling device can more easily locate through measuring the shade edge that between the unit that has illuminated and do not illuminate, exists, and has the resolution that equates with the unit of accepting module significantly.
If light source is light emitting diode (LED); And be positioned in position transducer the opposite so that the light beam that its points to receiver just can not disturbed by connecting rod; Its benefit is that inexpensive light emitting diode has the vital near point light source of high optical resolution, also has an almost unlimited working life simultaneously.It is placed in the opposite of position transducer and exceeds connecting rod cause between light source and receiver, having produced a long segment distance, this makes the angle of projection of relevant light beam be relatively independent of the mounting point of element.
If the initial value of position transducer (36) is the tonal value to the several pixels that are positioned at the shade transition region to carry out interpolation and obtains, so the resolution of position transducer initialize signal can than the mechanical spacing of the unit through the CCD receiver confirm meticulousr.
If when the signal of handling from position transducer, adopted the means of filtering, the antijamming capability of position transducer will be improved so.
If eliminate the zero error of position transducer or through adopting one or more reference positions to eliminate the error of graduation of position transducer through a benchmark memory; The susceptibility of the mechanical displacement of position transducer variation that assembling is produced and generation in service is lowered so, and these displacements are for example to pine for or because the wearing and tearing of bearing produce adding.
If through using pixel brightness value to control or adjust the illuminance level variation that light source is smoothed position transducer, position transducer will reduce the susceptibility that module parameter changes so.
If the variation of the brightness between the single pixel of optical receiver compensates through the benchmark memory that adding is used for the susceptibility of each pixel, the influence of stain will reduce on the optical receiver so.
If the signal of position transducer in control gear, is further handled also and reference value compares; Wherein control gear influences electric current in the magnetizing coil to proofread and correct amount of movement; Can utilize that this big autotelic influence obtains or improves measuring useful fluid power characteristic to diaphragm movement; Such as being used for slow metering process, carry out the accuracy of pressure compensation and/or metering section stroke.
If control gear will be used with the appropriate control mode that the actual metered mission requirements is complementary through changing position, speed or the acceleration that coil current comes alternately to influence push mechanism so.Control barrier film speed can directly be controlled the actual flow velocity of the medium that is measured, and this is necessary to preventing to cavitate in for example slowly filling.From another point of view, the position of control barrier film means can be controlled near state of rest, and under this state, it is very faint that the information about speed that is obtained by the path signal difference becomes, and can not carry out proper process by controlled device.The control diaphragm position has been avoided this problem and in the length that is used to limit the electronics stroke or be useful during metering process slowly.The acceleration of control barrier film also is good, because the acceleration of moving matter directly reflects magnetic power and indirect reflection magnetoelectricity stream, thereby adjustment easily.
If control gear is had a mind to slow push mechanism in the speed that fills stage and/or pressure stage, can be cancelled by the pressure loss that the generation of the resistance of current or cavitation erosion is caused.When the metering as the high viscosity medium of lecithin and so on, when flow is very high, in such as the narrow and small zone in valve, produce big pressure decline.These pressure descend must since from the form of the secondary power that drives overcome simultaneously can be through controlling barrier film speed with remain on low-level in.In addition, the mobile noise of reduction flow velocity generation can be by effective reduction.When being measured the easy product gas of material, such as the chlorine of bleaching usefulness, especially in the filled stage, this moment, flow velocity was too high, was reduced to be measured through pressure and often cavitated below the THE VAPOUR PRESSURES OF SUBSTANCES, caused the mechanical wear aggravation.The control barrier film in the speed that fills stage and/or pressure stage to avoiding this phenomenon useful.
If the expectation length of stroke be input into control gear through the operator, and the motion controlled device of push mechanism through control magnetizing coil be limited to length of stroke to be carried out, so just can save the mechanical checkout element in a large number.Even also do not touch the mechanical damping district, absorb the O shape ring that energy uses so and also can be removed if the motion of push mechanism is limited in maximum stroke length through the electronics mode.
If the set value of stroke adjustment is directly to be determined by the measurement in the process of position transducer metering, following the additional sensor of airborne element for mechanical positioning so and also can be removed.
If control gear limits push mechanism in the beginning in pressure stage and/or the speed when finishing; Such as at first or last three/one-stroke; The control magnetizing coil because the quick pressure peak appearance that changes or produce because of the violent mechanical buffer area of bump takes place the speed of the fluid that is measured, means then that the annex of other needs such as pulse retarder can be removed to prevent.
If control gear occurs to avoid overload through the speed of control magnetizing coil restriction push mechanism when the pressure stage finishes, the accuracy of metering can be improved greatly so, especially under low back pressure situation.
If control gear drives electromagnetic coil to distribute travelling forward of push mechanism in the pressure stage through the given cycle of cycling rate with the metering stroke; The material that is measured is distributed with possible smooth fashion; For example; Even with the slow metering stroke of endurance a few minutes, the change in concentration of the material of can avoiding basically so being measured.
When working with the continuous metering pattern; When promptly in filled stroke and ensuing metering stroke, not having at interval in fact; If control gear changes stroke movement; Reducing length of stroke, improve stroke frequency, to keep barrier film speed almost constant metering effect that obtains to expect in metering process simultaneously, and if it finish to start stroke before push mechanism is resumed the mechanical damping device that spring is pushed into the place ahead fully through the control magnetizing coil so that the motion of push mechanism only occurs in space and all little stroke movement scope of magnetoelectricity stream requirement; According to the time, the thermal loss that required electricity drives and produces all is reduced like this.
If in the controlled proal incipient stage of barrier film; Through control gear itself or another control unit observation magnetoelectricity stream; Infer power profile and detect the unlatching of outlet valve from the instantaneous power distribution map; From observation, measure the dead band that the resiliently deformable by barrier film causes again, stop to influence actual stroke path through having a mind to again, thereby the mistake that diaphragm deflection (with respect to stroke or metered volume) causes is eliminated with the relevant stroke movement of stroke distortion; And stoichiometric number is also fully reduced the dependence of back-pressure, and then metering precision is improved.This raising is through eliminating the mistake that barrier film generation resiliently deformable is caused because of operation pressure measuring accuracy to be obtained, thereby said distortion can not influence metering.Owing to reduced the dependence of metered amount to operation pressure, the calibration once more that when the operating parameter such as operation pressure significantly changes, need carry out under other situation just has been removed.It is useful through observation magnetoelectricity stream diaphragm deflection being compensated, and especially for magnetic driven metering pump, it is to the fine reflection of needed actual power and this power can be inferred from the signal that can access and measure without any need for additional.
When operation reduces length of stroke; If actual stroke controlled device operation, that be independent of the measurement dead band that is produced by the resiliently deformable of barrier film influences through having a mind to end stroke during push mechanism travels forward; Thereby the mistake that is caused by diaphragm deflection is eliminated the line style dependence also greatly raising of while stoichiometric number to the length of stroke percentage of setting, and this will improve the accuracy of measuring in this situation.This raising is to obtain through the error that the resiliently deformable of eliminating the barrier film that is caused by operation pressure causes, therefore said amount of deformation is not proportional with mechanical preseting length strictness to influence of metering nothing and effective stroke length.At last, the statement of being done above connects each other at this.
If during push mechanism travels forward; Control gear is measured by the dead band of the resiliently deformable generation of barrier film and with it and is estimated operation pressure; Superpressure can be detected easily and limited in metering process so; If predetermined simultaneously maximum pressure value is exceeded, should proofread and correct metering to avoid the further rising of pressure.Therefore, if metering pump is only pressure riser in the technology, so far those essential annexes, can be removed like the superpressure limiter.
If cool off enclosure interior, comprise magnet and electronic equipment, the heat that produces in the magneto drive metering pump can effectively be scattered and disappeared.This makes the operation that can produce a large amount of heats be able to carry out, such as continuing metering with low barrier film travelling speed.
Be used for cooling-part if electric fan is positioned in inside, its air-flow is introduced to the wall of magnet and/or coil winding and the inwall and the miscellaneous part of magnetic driven metering pump housing, and the heat that magnet or said parts produce directly is discharged on the inner air and housing.The air-flow that is directed has improved the heat of heating element and has transmitted resistance and reduced the rising of enclosure interior temperature with respect to air temperature.Because heat is average in the whole surface distributed of housing, most surfaces has played radiator under the situation that does not have directly cooling.The peak temperature of surface of shell and pump inner piece is lower than what do not cool off.
Be drawn towards position transducer and cool off it like the fruit part air-flow, in fact its temperature will be consistent with the gas temperature in the housing so.Because position transducer in measure error and very to settle near magnet be useful; It will become the same with magnet hot not utilize this way of fan cooled; And will be more high than general gas temperature in the housing, because up to the present magnet is a waste heat source maximum in the instrument.
If guide surface and/or runner link to each other with the lid of the part air-flow being guided into position transducer, air-flow will be more prone to be drawn towards position transducer so.
If another part air-flow is drawn towards the electronic instrument that is installed in the outer housing cover, in fact its temperature will be consistent with the gas temperature in the housing so.Because the electronic instrument that is installed in the shell also is placed relatively near magnet, they also can be heated by magnet not have the type of cooling, and their temperature will be more much higher than the bulk temperature in the housing.
If the magnet cover in the housing is positioned to its periphery can be blown to by air-flow, also become easily through the fan cooled magnet so.
If coil winding reduces the number of turns in order to increase the cross toe-in, when the motion of control magnetic push mechanism, can change coil current as required fast so.
Description of drawings
We will specifically describe an instance of the present invention and some application now.Accompanying drawing comprises:
Fig. 1 has the sectional view of the magnetic driven metering pump of controlling magnet;
The exploded view of Fig. 2 position transducer (enlarged view of X part among Fig. 1);
The assembly of Fig. 3 position control circuit;
The assembly of Fig. 4 speed control circuit;
Fig. 5 position transducer plan view vertically;
Fig. 6 is perpendicular to the axial side view of position transducer;
The schematic representation in Fig. 7 position transducer shadow zone;
The tonal value of the actual shade transition zone of Fig. 8 interior pixel;
The schematic representation that Fig. 9 position transducer is measured according to the baseline of geometrical arrangements;
The interpolation of Figure 10 position analysis;
Figure 11 is used for the schematic representation of calculating benchmark of the interpolation of position analysis;
Graph of a relation between Figure 12 metrological performance and mechanical length of stroke, the operation pressure;
Figure 13 cools off the schematic representation of notion;
Figure 14 has the metering process oscillogram of cavitation erosion protection in the stage of filling;
The metering process oscillogram that Figure 15 does not cavitate and protects;
Metering process oscillogram when Figure 16 length of stroke is limited to 0.9mm with electronic method;
Figure 17 controls the metering process oscillogram that finishes buffering;
Figure 18 is the metering process oscillogram of metering slowly;
Figure 19 fills the stage has metering campaign and the schematic representation that the magnetoelectricity followed flows of the slow metering of cavitation erosion protection.
Embodiment
Fig. 1 has shown the longitudinal section of magnetic driven metering pump (MD).One downside is the housing 1 of base plate 4, and it possesses the rib bar 3 that is touched to prevent hot surface near magnet (top).As everyone knows, the upper area of housing 1 has comprised the cover plate 17 that magnetic drives.The one side of housing is mounted on cap 5 sealings on the housing.At the center of cap 5 and with the longitudinal axis 18 coaxial line places of rotational symmetric magnet basically, but the correcting unit 7 of a manual tune is incorporated into and is used for limiting moving axially with the stroke of diaphragm pump stroke of push mechanism 20 with adjusting on the cap and proofreaies and correct pin 8.Correcting unit 7 and 9 protections of other operating element quilt covers.It below cover 9 interface of guide line 10 or total electric wire 11.Being metering head 12, extend therein such as the barrier film that is made of plastics 13 and open with covering a relative side.Metering head 12 also has an inlet valve 14 and an outlet valve 15, is used for the metered dose that is brought to the measuring room 16 between barrier film 13 and metering head 12 through inlet valve 14 and outlet valve 15 is pushed in the measurement channel.Magnetic driven metering pump is a quantitative work, and just, each stroke charges into a predetermined, passes through outlet valve 15 then with its release.Barrier film 13 is driven through a vibration.This describes pointedly as " magnetic driven metering pump ", and the driving of barrier film 13 is one by the electromagnet that constitutes of the symmetrical magnetic cover plate 17 of rotation, and its inside is a rotational symmetric magnetic coil 2.The rotational symmetric coil supporter of being made up of plastics has constituted this magnetic coil 2, and the winding 29 that carrier is formed by the many volumes that are made up of enamel covered wire twines.Such as, magnetic coil contains the coil of 800 about 1mm linear diameters.Coil supporter and winding are arranged and are insulated material suitably, insulated like paper tinsel.Magnetic cover plate 17, one solid-state rotation symmetric objects and the magnetic sheet 25 that blocks from magnetic cover plate 17 to push mechanism 20 the magnetic line of force surround push mechanism 20 together, and the connecting rod 19 of these parts is placed in the parts center, and with push mechanism 20 together can axial motion.Lean on stroke to proofread and correct a side of pin 8, but connecting rod 19 and the stroke correcting device work of correcting unit 7 as manual tune.The other end of connecting rod is worked with elastic diaphragm 13.Push mechanism 20 is fixed on connecting rod 19 and proofreaies and correct on the part of pin 8 towards stroke.The center of barrier film 13 is fixed on connecting rod 19 on the part of metering head 12.Connecting rod 19 can be installed in the axle sleeve 26 that is arranged in magnetic cover plate 17 centers axially with push mechanism 20.At the magnetic cover plate is O shape circle 21 on the face 24 of push mechanism 20, the impact that its produces when absorbing by the relative inner face 24 of the inner face 22 bump magnetic cover plates of push mechanism.In addition; One pressure spring 23 is arranged in the face 24 of magnetic cover plate; For example be a spiral spring, it is installed in a hole of push mechanism face 22, and uncontrolled magnet makes push mechanism leave the internal surface 24 of magnetic cover plate so that between two faces, form the space together.The magnetic cover plate has magnetic sheet 25 in a side of proofreading and correct pin 8 towards stroke, and it is installed and fixed the magnetic cover plate and block the magnetic line of force from the magnetic cover plate to push mechanism by screw thread or pressurization.But rotate axially displacement in the magnetic sheet 25 in another axle sleeve 27 of outer surface of symmetrical push mechanism.One lid 28 is fixed on the magnetic cover plate of controlling device one side and proofreaies and correct pin 8 to lay stroke; It is fully away from magnetic cover plate and push mechanism that this lid forms on the one hand; The motion of push mechanism just can not hindered like this, can guide the air-flow that fan 43 produces into position transducer 36 on the other hand.Controlling device, stroke proofread and correct pin and connecting rod by coaxial line be placed on the longitudinal axis 18.If magnetic coil 2 is energized, push mechanism 20 moves to pressure spring, and the space is diminished; Simultaneously barrier film is pushed measuring room; That will cause superpressure occurring at measuring room, will open such as the outlet valve 15 that is a spring-loaded ball valve, and the material that will be measured is simultaneously shifted onto in the metering pipeline.If magnet is outage then; Push mechanism spring 23 as a spiral spring effect by compression and proofread and correct pin 8 along opposite direction towards stroke and move; The connecting rod 19 that causes linking to each other with barrier film drives barrier film; Simultaneously in measuring room 16, negative pressure occurs, inlet valve 14 is opened, the material that is measured of another batch just can get into measuring room like this.Alternately the vibrating of barrier film that causes through magnetic drive unit is sent in the metering pipeline material that is measured.
The position at the place of being made up of connecting rod 19, push mechanism 20 and barrier film 13, unit is detected by position transducer 36, from the signal and the position of sensor one relation of being scheduled to is arranged, and this relation will be the proportionate relationship of for example a kind of strictness.Therefore the position component with removable unit is relevant always from the signal of sensor 36.This immovable point is made up of reference element, and this element is abstract in this example.According to the requirement of position transducer, it can be used as a tangible add ons and is mounted, but it also can form by a character shape separately, such as one edge or face like the desired assembly of push mechanism 20 and so on.
In this example, be fixed with a sensor carrier 31 (referring to the example among Fig. 6) on the magnetic cover plate 17, its side is loaded with vertical sensitization CCD unit 32 (electric coupling devices), is loaded with light source 33 in an opposite side simultaneously, like a light emitting diode.
The sensor carrier 31 that is fixed on the magnetic cover plate has a center window 34 to supply connecting rod 19 to pass.Pass at connecting rod and fixed one on the part of position transducer 31 and supply with the reference element of body 35 as shade.When connecting rod 19 vibration, shade supply with that body 35 also moves and from the contact photosensitive unit 32 through and do not contact it.The situation of overlooking on Fig. 5 has shown axially; Therefrom can be special see; Light source 33 must be arranged to guarantee can not interrupted by connecting rod 19 at light beam on the road of photosensitive unit 32; For example this means that light source 33 is set on the connecting rod 19 or under, the line arrangements of the CCD of sensitization simultaneously unit 32 is at the axis of connecting rod 19.Can see especially that in Fig. 7 a shade is provided body to project on the photosensitive unit 32 by the shade of light source 33, this unit is divided into illuminate unit (h) and do not illuminate unit (d).Because the direction of every row's photosensitive unit is parallel to major axis 18, it covers the distance of about 8mm such as 128 pixels, and part is illuminated or is in the shade in transition region, and the crossover position SV that shows among Fig. 8 has so produced.The height of the rectangular surfaces that shows among Fig. 8 has been represented the brightness of pixel.To describe a kind of special method according to Figure 10 in connecing down, it utilizes this crossover position to come accurately to judge that shade supplies with the position of body and and then obtain the position of connecting rod and barrier film.This by supplying with body at the shade of connecting rod one side and being used to physical location or the speed of measuring vibrations connecting rod and utilizing this information to realize described function at the measuring device that sensor carrier one side is formed over against the sensitization CCD of light source.
The connecting rod that barrier film is vibrated, the distance of its each stroke is corresponding to mechanical length of stroke.For the variation in considering to assemble, what the longitudinal extent of sensitization CCD unit must be a little is bigger.This is the situation of other position transducers that possibly faced basically.
Of Fig. 3 and Fig. 4 especially, as to form by sensor and control gear following machinery and the electronic unit of control circuit needs.Following implication is being represented in abbreviation in two secondary figure:
x s: the nominal value of push mechanism position
x I: the actual value of push mechanism position
x SI: the deviation of push mechanism position
v s: the nominal value of push mechanism speed
v I: the actual value of push mechanism speed
v SI: the push mechanism velocity deviation
SG: the output of controller
KSG: the controller output after the correction
I M: magnetoelectricity stream
The stationary part that magnetic drives is made up of magnetic cover plate that has magnetic coil 2 17 and magnetic sheet 25, respectively carries the supporting sleeve 26,27 of insertion on magnetic cover plate 17 and the magnetic sheet 25, and said supporting sleeve 26,27 is used to supply the unit of push mechanism 20 and connecting rod 19 compositions.The motion of the active part that magnetic drives is can be controlled, and it comprises connecting rod 19, couples together with said diaphragm center 30 through the push mechanism 20 of this connecting rod as driver element.Recovery springs 23 makes push mechanism return and fill after a working stroke.The outer shroud of barrier film 13 is fixedly installed to 12 li of metering heads, and the diaphragm center 30 of being put into the metal of barrier film makes the interior diaphragm center surface of metering head along with push mechanism is moved.Inlet valve 14 is filling near the side, outlet valve 15 at metering head on the pressure side, and two valves outside pipe-line system of respectively doing for oneself provides connection possibility.Reference element is connected with connecting rod 19 towards the end points of metering head, and its position can be detected through the position transducer 36 that work the time does not come in contact in the case.Shown in specific embodiment; Reference element is that a tabular shade is supplied with body 35; Simultaneously position transducer is the device that is similar to light box, and it is made up of the light source of as above describing 33 and a series of photoreceptor elements 32, can not contact and through shade just with the position of optical means judgement ejecting plate 35.
Position transducer 36 produces the proportional actual signal x in the position with reference element IAs for speed regulator, it is one time of feedthrough derivative unit 37 (dx in this embodiment I/ dt) also additional generation one and the proportional actual signal v of speed IOther methods that can produce with the proportional signal of barrier film speed obviously also are applicable to this control step.According to the type of control and the requirement of metering, produce position X sNominal value 38 or speed v sThe time distribution map of reference.One diversity ratio has obtained like positional deviation x than 39 SI=(x s-x I) or speed variation v SI=(v s-v I) difference and the result is input to PID control (ratio, integration and differential control).Export, be controller output SG, the value that is equivalent to drive.In order to improve the stability of controller, before further handling, a position correction value 41 has been considered that magnetomotive improvement makes and has been obtained only more and more littler this fact of electric current of needs of a given power.Proportional part through from initialize signal 4, deducting a position obtains position correction value 41.PID controller 40 produces corrected control output KSG.One amplifier 42 keeps power level and supplies with desired electric current to coil 2.The current correction relevant, conversion from nominal value to the actual magnetic electric current with the position and in case of necessity with the deflection constant that is used for forming rate signal VI through three scale factor k 1, k 2, k 3Decide.Selection is used for the factor k of the correction relevant with the position 1So that reducing degree, electric current is close with the magnetic steady-state characteristic as much as possible; The k that is used for amplifier 2Or be used for the k of rate signal deviation 3These two factors can be selected according to actual conditions, such as in order to use size in best provided scope, to operate.
Fig. 3 has shown the control circuit that is used for position regulator, and Fig. 4 has shown the control circuit when the operating speed controller.Described control circuit is with position nominal value x sOr speed nominal value v sThe scheduled time distribution map of foundation transforms clear record in the context of its possible control law.
For position, speed or acceleration are set up the validity score Butut, and switch according to following being described in these operator schemes, such as, consider the function restriction of controller, like available precision of control rate or the like.
Through such control, magnetic driven metering pump can be used to the goal pace of predetermined barrier film, can be used to control simultaneously the effective liquidate speed of the material that is measured.
The position of barrier film can be by directly control like this.This function allows to obtain the position in the selected stage of metering process, also can obtain the position like the words of needs at quiescent phase.
With the operation compared that does not have control; Through coming controlled motion by position indicator; Can respond the running parameter that produces by the statistic bias on the production line change and its infringement is dropped to minimum, and these change along with the time in the past or because the consideration on the environment or change, i.e. statistic bias in product line and occurring.Because consideration on the environment or deviation can occur suddenly or take place in time.The example of quotability is the viscosity of the rigidity of barrier film or the material that is measured.The both requires to increase magnetic force to produce operation pressure at membrane surface.Through the influence of impaired judgement and then regulate magnetoelectricity stream, those infringements just can be compensated.The magnetic metering pump of the use determined magnetic electric current that can not regulate even be controlled to keep stable, still can receive above-described influence.
In addition; Compare with the metering process of the spontaneous generation that does not have control operation; Come controlled motion through position indicator, can make to the inside and outside influence that next will describe react and set up can utilize or avoid measuring in the operational condition of special hydraulic condition become possibility.Be described below be one the start up period the example of cavitation erosion protective function.
Begin to describe the individual instances of the magnetic driven metering pump of type as stated now, this pump has the position transducer through control and adjusting magnetic coil current affects diaphragm movement.
In order to describe these possible application, Figure 14 to 19 has shown the oscillogram of suitable metering process.In each figure, upper curve Pos has shown according to scale to be the diaphragm movement of 0.5mm/ scale, and buffering terminating point Epos is at the top edge of figure.The rising part of Pos corresponding the metering stroke, the corresponding stroke that fills of sloping portion.Lower curve I MShown according to scale be the 1A/ scale follow magnetoelectricity stream, zero point line I MOBe positioned at the lower limb of figure.Although not dated especially, " Pos " in Figure 14 and Figure 15 to 19, " Epos ", " I M" and " I MO" all show in a similar fashion.
In high viscosity substance, avoid flow loss
Regulate the speed of barrier film 13,, may be limited to the flow loss at the bigger position of valve and other resistances especially for high viscosity substance (for example lecithin).High flow rate in such material can produce passive influence to measuring accuracy, because fluid resistance can cause extra pressure to descend.In addition, be good if make valve have the more time to open and close because of maximum speed limit.These two influences can improve measuring accuracy in high viscosity substance.
For the attainment of one's purpose, permitted in the amount process whole, barrier film speed is defined to a selectable maximum value.This top speed is according to the viscosity of the actual contents that is measured and with the form of several predetermined values, applicable cases or the directly setting for example selected according to the operator.
The cavitation erosion protection
When material is to discharge gas (such as the chlorine of bleaching usefulness) easily; Especially in the filled stage; But also can discharge gas in the metering stroke stage; Too high flow velocity can cause the decline because of vapor tension to produce cavitation erosion at the throttle point place, this chemical composition and temperature according to the material that is measured also can cause the wearing and tearing aggravation.Can the filled stage, be barrier film when returning through regulate flow velocity make its under critical flow velocity with limited flow rate, thereby avoid cavitation erosion.Through control circuit is that magnet is set the power of a control force with opposing recovery springs 23, barrier film speed is limited according to physical property, as be limited in 1mm/50ms.
Shown the metering process oscillogram that the cavitation erosion protection is arranged under the nominal operation pressure of stroke cycle at 400ms, 2mm length of stroke and 10 crust, in the stage of filling such as Figure 14.
Figure 15 has shown the metering process oscillogram that under similarity condition, does not cavitate and protect in the stage of filling.
In the filled phase process in Figure 14, speed is limited at about 1mm/50ms through driving magnetizing coil, and promptly control gear avoids barrier film to be resumed spring 23 fast return to surpass the setting speed driving; This graphic display accomplish the magnetoelectricity stream situation in the filled stage of this process.Among Figure 15, magnet was not driven in the filled stage, and this stage does not have magnetoelectricity stream in this case.Thereby this can cause very high speed to cause cavitation erosion.
The electronics length of stroke is regulated
The present invention allows to save the mechanical device (regulate parts 7 and proofread and correct pin 8 with stroke) of regulating length of stroke.For this reason, control gear is informed desired length of stroke through the electronics mode, as being imported by the operator.If the length of stroke of expectation is moved, the position that barrier film 13 arrives will be stored and turn back to the stage of filling.Barrier film can be done to stop on the pointed position of nominal length of stroke so that outlet valve 15 has the sufficient time to cut out slightly, or after having moved the nominal length of stroke, returns immediately.
As an example, Figure 16 has shown one in the stroke cycle of 400ms, and the nominal operation pressure of 10 crust and 0.9mm electronics limit the metering process oscillogram under the length of stroke.As can be seen from the figure, barrier film does not arrive the buffering terminal point at the figure top edge fully, but the start up period just stopping behind the 0.9mm that advances and begin.
Detect the position of the adjusting control of length of stroke
The operation of the metering pump of existing technology often is calculated to be a metered volume and shows it through directly measuring stroke from the setting value of cylinder displacement (length of stroke), such as using unit to be the l/h volume flowrate.For this function, need know the length of stroke that the operator sets, because the volume that each stroke is measured depends on this value.For this reason, the position of the metering throw of pump controlling device of existing technology must be converted into electronic signal and be input to control system by the sensor of a separation.An instance is to realize through the rotating speed tag reader that stroke is regulated on the parts.
The sensor that the metering pump of a may command motion need not add is because it can use airborne position transducer to detect actual barrier film path in stroke procedure.Through generating poor between two positions on the endpoint location, length of stroke can directly be calculated and can be used for further processing, can reach behind the mechanical damping, when motion stops, measuring this two positions immediately.
Avoid pressure peak
In the magnetic driven metering pump of existing technology, the material that is measured is very promptly quickened when outlet valve is opened, because opening procedure is very unexpected comparatively speaking, and has caused pressure peak.In addition; The barrier film in the magnetic driven metering pump of existing technology and the material that is measured be the space through reducing very apace; Especially at the last section of stroke movement, this means that the strong cushion at collision of push mechanism produces high instantaneous velocity or pressure peak simultaneously.
The controllable magnetic driven metering pump of described motion can have a mind to underspeed and avoid these negative influences in the last section control metering push mechanism in path through opening at outlet valve and reaching the moment of buffering before the terminal point.In a modification, might do not clashed into by buffer yet, but diaphragm movement before reaching buffer by of short duration stopping wittingly.Like this, O shape ring 21 can be removed or reduced greatly dimensionally.In addition, operational noise also is greatly diminished.
As an example, Figure 17 has shown one in the stroke cycle of 400ms, under the nominal operation pressure of 2mm length of stroke and 10 crust, the metering process oscillogram of control bump is arranged at the buffering terminal point.As can be seen from the figure, barrier film speed just is reduced before the about 0.6mm/50ms of top edge that arrival buffering terminal point is promptly schemed.
Avoid overload
In the magnetic driven metering pump of existing technology, overload occurs under the very low back pressure.Its appearance is because at the terminal point that measures stroke; Outlet valve do not close immediately and the material that is measured because a kind of owing at a high speed further flow through metering head with the momentum siphonage that produces that interrelates, inlet valve unlatching too early simultaneously makes the excessive material that is measured enter into outlet line.Because overload does not have the pump of control can only be used under the situation that surpasses the minimum operational pressure that clings to such as 2-3,, on outlet metering pipeline, a pressure retaining valve is installed usually in order to ensure this condition.
In the controllable magnetic driven metering pump of motion, in fact electronics restriction barrier film speed can avoid producing the siphonage of overload fully momently or in whole metering stroke procedure before arriving the buffering terminal point.The operating range of metering pump just expands to low operating pressure, and pressure retaining valve can be removed under most of metering situation simultaneously.
The motion that in Figure 17, shows has the exception that relates to a special low operating pressure.
Slowly metering is to avoid change in concentration
Because in application, need the technology material flow be mixed well, so must as far as possible the material that is measured be distributed in the technology equably.
In the controllable magnetic driven metering pump of motion; Available time by the repetition frequency decision of measuring stroke can be assigned with; Residence time after the stage of filling is reduced like this, even to having only flashy stopping, can utilizing maximum time to be used to travel forward simultaneously.Controlled speed calculated from the path (setting length of stroke) of passing by and available time.The use amount of available time is according to the characteristic of measuring requirement and Cooling Design, and this need adapt to because of magnetic and drives the heat that interruption of work hardly continues to increase.
As an example, Figure 18 has shown one in the stroke cycle of 500ms, and the nominal operation pressure of 2mm length of stroke and 10 crust slowly under the quantitative model, has and fills the metering process oscillogram of stage with the reply cavitation erosion slowly.As can be seen from the figure; Whole stroke cycle 500ms is adjusted to pressure stroke stage that surpasses about 250ms and the filled stroke stage that surpasses about 180ms; Both add 86% of 430ms or the whole stroke cycle of standing up, and residue 70ms is used to separately each motion stage.
Some use also requirement especially might measure very little amount in the very long cycle, to produce a subcontinuous metering.Therefore in the electronic metering pump of existing technology, used like stepper motor and automatic step-by-step.Rotational velocity reduced or the dwelling period through the centre separates several steps when a complete stroke carried out in such metering pump; In the filled stage that the terminal point of full stroke begins one complete (fast) again, metering process continues in the manner described afterwards simultaneously.
The present invention can satisfy these requirements through simple, cheap magnetic driven metering pump structure.Barrier film 13 must move with the control mode that on stroke path, keeps ten minutes low speed, and at the terminal point of stroke, the whole filled stage is moved with normal speed simultaneously, and the whole like this stroke cycle can almost entirely be used as pressure stroke.Speed can be in a very wide scope, such as from 1mm/min to 1mm/s with exceed this scope.
In one example, trickle rest energy is inserted in the componental movement, and its septation 13 is maintained at the fixed position.This provides prescribed condition clearly for outlet valve 15, and those were slow and disabled near static motion, and this athletic meeting produces big strain at outlet valve 15.When operation pressure in two examples used quasistatic magnetic force, in fact heat load was the same to the variation that the linear motion form produces.
Another example can reduce heat load; Wherein the stroke movement like precedent is divided into little motion parts; Quiescent phase between motion parts, barrier film 13 is in order to reduce pressure through closing outlet 15 rapidly and reducing simultaneously in the magnetic power demand of quiescent phase and a bit of off-load of inverted running path.The stroke path of accomplishing pratial stroke so operation in general through this section off-load path amount does not change.Compare the displacement path (with variation in pressure) of barrier film, the off-load path must be shortened to prevent that part between pratial stroke from filling the stage and being reversed operation and reducing precision.These useful instances and the pressure compensation joint work that is described below, as the distortion of measuring diaphragm, the off-load path just can better adapt to physical condition like this.
Pressure compensation
Through controlled motion, control system all is in balance (promptly being in stable state) at any point that magnetoelectricity stream is arranged, and these electric currents are covered by external force (relevant with the time).
The magnetoelectricity stream that needs is by instantaneous power and the space generation between the internal surface 24 of the internal surface of push mechanism 22 and magnetic cover plate.One characteristic current I MBe in the metering stroke, to produce, shown in figure 19 especially.For example oscillogram has shown that one is divided into the length of stroke of 2mm and the electric current that surpasses 2.0 seconds stroke that nominal operation pressure is 10ba.At the terminal point of stroke, slow down the stage of filling in order to prevent cavitation erosion, but these observations for following description are unimportant.The time scale of figure has reflected stroke slowly.
Lower curve I MShown a comparatively faster growth of electric current till barrier film 13 setting in motions during beginning.After an of short duration fluctuation up and down, electric current just increases up to reaching maximum value always.Begin from this point, electric current descends up to the terminal point Epos that reaches buffering with in fact linear mode in remaining path.In the filled stage, more electric current prevent barrier film too snapback's motion to avoid cavitation erosion.From this characteristic procedure, can obtain to draw a conclusion:
The incipient fast rise of-electric current (in the drawings from 0 to 80ms) is to be caused by the inductance action of magnetic coil 2 and the speed of control gear; Can not have electric current to change at this coil of time zero, and the speed of control gear just must be adjusted to the motion that is suitable for requirement when beginning.The electric current that increases strengthened magnetic force up to external force be overcome with push mechanism 20 with barrier film 13 setting in motions.In this stage, magnetic field is established.
-after the regulating and controlling of beginning electric current almost linearity rise to actual maximum current (in the drawings from 80 to 400ms), this has increased power requirements, because for obtaining constant force and reducing the space and must reduce magnetoelectricity and flow.In this stage, measuring room 16 is still closed with outlet valve 15, and interior pressure holding is continuous rises, power and resiliently deformable that its septation 13 utilizations increase.In this process, diaphragm center 30 moves in the measuring room 16, boost pressure, the flexible part of elasticity also motion that reacts on diaphragm center of equal extent under pressure of barrier film 13 simultaneously.Itself deforms barrier film, simultaneously in fact generally speaking distortion take place because at this moment two valves be close and the material that is measured in fact also is can not be compressed.At the terminal point in this stage, constant pressure is equivalent to peripheral operation pressure.Dead band during by cross-section path and diaphragm deflection, i.e. metering beginning is corresponding, and in fact to not contribution of metering.Physical location is stored and in ensuing metering process, takes in (in example, the dead band is 0.3mm) as the distortion of measuring
-at equinoctial point, outlet valve 15 is on the pressure side opened.In fact pressure on the barrier film 13 equate with external pressure and no longer rise, cause the residue space reduce and continue move become continuous motion (beginning from 400ms in the drawings) in magnetoelectricity stream one constant force.The flow velocity of material remains on for a short time of ignoring because when using described technology, be measured, and also do not have the variation in pressure generation, so current distributing figure reflects magnetic force (seeing Figure 19) once more.
-after reaching balance and opening outlet valve 15, magnetoelectricity stream is no longer relevant with the measurement result of this described diaphragm deflection.For instance; When measuring diaphragm is out of shape; The motion forward of one linearity can be controlled through the nominal value of a speed at first; This value is optimized for measuring current maxima, simultaneously obtain and store the diaphragm deflection amount after be switched to the motion path of a skew immediately, this path meets one of requirement of described function.For instance, in the beginning of stroke, measuring diaphragm distortion in a relative short cycle, actual then metering stroke can carry out with the form of slow metering in the available time of residue.
Flow measuring diaphragm to be out of shape through the observation magnetoelectricity and can be used as basis of proofreading and correct length of stroke HL and the barrier film path that can be used to calculate operation now.For this reason, the point when electric current reaches maximum value is used as the actual start point of metering, and from then on, desired length of stroke is moved and finished before machinery stops buffering through the internal surface 24 of push mechanism 20 bump magnetic cover plates.Less than nominal pressure, the diminish decline of the mechanical path that simultaneously push mechanism is possible of diaphragm deflection is not used yet, and that is to say that the space is not closed fully for working pressure.
Diaphragm deflection especially relies on material property and can change because of the difference in aging or the production.Because the correction of diaphragm deflection is not to use the physical condition that is to use resulting each stroke to upgrade from the predetermined value of module parameter, so this two aspect also is taken into account.
Magnetoelectricity stream can be obtained, but this is not really to need.Because the output of the control after amplifier 42 usage factor k2 will proofread and correct KSG is the magnetic coil electric current I with the formal transformation of magnetoelectricity stream M, control after correction output KSG can directly be used as the reflection of magnetoelectricity stream, and this can be used to further processing under more conditions of measuring more the signal of control system not being carried out.
The raising of pratial stroke performance accuracy
Elasticity with barrier film is the basis, flows the aforesaid process of judging diaphragm deflection through the observation magnetoelectricity and makes that also precision is improved in the pratial stroke operation.
In the magnetic driven metering pump of existing technology, metering is not unique pressure that depends on, and sees the pratial stroke condition that does not have strict proportionate relationship with mechanical length of stroke.In addition, only behind the dead band that starts, this lights stroke to reach maximum value from diaphragm deflection, and effectively metering just begins.If having shown the metering distribution map is this steady state characteristic appearance of function of mechanical length of stroke, can only be presented at the linear ascend curve of minimal stroke length real work situation afterwards so, and these minimal stroke length and dead band x T1, x T2, x T3... x TnCorresponding (seeing Figure 12).Because minimal stroke length is corresponding with diaphragm deflection, so it also depends on operation pressure p 1, p 2, p 3... P n
In steady state characteristic, rotate x T1, x T2, x T3... x TnMean it is in the prior art, under real operating conditions, promptly in the scope that in fact the electric current length of stroke changes, proofread and correct, because calculate the precision that can not guarantee newly to measure effect in proportion with electric current and new length of stroke.
If aforesaid diaphragm deflection is compensated; Proportional error in the pratial stroke mode of operation just can be eliminated so; Metering pump in fact also just can be worked in such as from 20% to 100% whole stroke using scope; No longer carry out the calibration again that existing technology also needs up to now,, require the adjustment of length of stroke to surpass 10% such as in order to ensure special measuring accuracy.
Use electronics size, electron pressure to limit, survey overvoltage and estimate working pressure
Through formulating the performance number of barrier film material therefor, above-mentioned measurement to diaphragm deflection can allow to obtain the enough accurate conclusion about operation pressure, thereby carries out the additional function that is described below.
The magnetic driven metering pump that can not regulate in the existing technology has a base attribute, and the power that is produced by magnet exactly increases through reducing the space at the metering run duration fast.Measure magnetoelectricity stream when guaranteeing in starting point, promptly to have a big space, the power that is used to produce nominal operation pressure is enough.In stroke endpoint, many times this power is employed.This can cause when the pipeline defectiveness, as accidental when closing breaking member, if pump is the length of stroke that pratial stroke operation one reduces, the pressure that this moment, pump produced can far surpass maximum service pressure.
Control in the magnetic driven metering pump of diaphragm movement in the mode that plays and regulate diaphragm movement through position sensing, the position of push mechanism is known with the length in residue space always.With the steady-state characteristic of known electric current, power, path and magnet together; Might control gear between the metering stroke be used for the maximum current of drive magnet and dynamically be complementary with actual diaphragm position, thus will be resulting on entire path power be limited in an approaching constant value.Therefore the pressure maximum that produces more accurately and be independent of the length of stroke of setting, the additional pressure restrictive condition that in many examples, uses like this can be removed.
This application of the present invention also can make the control system of metering pump go to guarantee that through measurement the information that obtains relevant superpressure becomes possibility, might needn't understand external condition like this and this situation is reacted, as producing alarm and/or stopping pump.
The accuracy of said function relies on the reproducibility of stock attribute, at first is barrier film.This accuracy can be through improving through disposable correction in the production phase or in practical application, and metering pump is driven under known pressure in correction, and the relation between this known pressure and diaphragm deflection has formed and has been used for the further basis of calculating then.
The various possibilities of aforesaid position indicator and control system have shown through use and have been placed in the position transducer on connecting rod for example or the push mechanism that the actual position of barrier film can be judged and detected in whole stroke and filled process.Set up the position and detect and cause and to come accurate control procedure and to produce the effect of describing through the mode of measuring actual value.
The cooling of magnet and miscellaneous part
The magnetic driven metering pump of contrast existing technology, in special mode of operation, such as magnetic coil 2 in for a long time in the slow quantitative model of follow current work, can cause high many thermal loss.Particularly ought be installed in the plastic shell, the problem that thermal conductance is gone out has occurred.In typical usage mode, magnetic driven metering pump often is installed in the plastic shell of protecting of spraying water so that it is insensitive to corrosive chemical.In these examples, in controlled magnetic driven metering pump, must guarantee with heat guiding through shell wall not the mode of exchange of air cool off.
In the magnetic driven metering pump of existing technology, magnet is positioned in the shell 1, thus magnetic cover plate 17 in transmission of heat with the contacting of upper surface as much as possible with shell 1, this contact can be through improving such as the mode of when making this shell, around magnet, inserting.Lean on the surface of 1 inwall can carry out the part heat radiation from magnetic cover plate 17 to shell.From the remaining part heat of magnet with from the heat diffusion of the miscellaneous part space in the shell, and make that temperature raises in the shell.These heats are sent to the shell inwall through convection current, and and from then on begin together through shell wall and finally being diffused into the surrounding atmosphere from the shell outer wall through convection current from the direct-coupled part heat of magnet.Because only repeatedly transmit through convection current and magnetic cover plate 17 and shell 1 between thermo-contact bad usually, such as because the edge of plastic shell processing bad or the like not have in the operation of control in existing technology, and it is very boiling hot that magnet becomes, temperature can be above 100 ℃.At the shell outer wall extreme heat of magnet upper area, for preventing to touch rib is housed usually, wherein in the gross area, have only sub-fraction, be that rib backbone top can be touched.Compare the few many heats of transmission to skin, so the temperature of shell seems much lower because touch shell rib 3 with touch one smooth surface.Rib also forms relatively little air flow channel and hinders convection current, and heat radiation has a negative impact to shell with this, causes the rising of surface and inside temperature.
In magnetic driven metering pump of the present invention because more than the problem listed and stroke pattern slowly, it is not enough only adopting those to use radiating structure so far.Need more effective radiating mode, as accomplishing through fan direct internal air.Figure 13 has showed more detailed cooling notion.Such as on the top of shell 1, magnet by several, be in the middle of three links 50 are fixed in this example, therefore between magnetic cover plate 17 on the circumference as much as possible and surface and housing 1, the little spacing of 5-10mm is at least arranged.Is electronic control system 44 and fan 43 in the bottom of shell, thus fan produce circulating air flow 47 blow over magnetic cover plate 17 with airborne with the electronics module that is encoded 45.Be described below, fan 43 can be to be applicable to module of electronic control system 44 or an independent module in shell 1.Certainly, fan can be set at other places, and importantly air flow guarantees that heat is pulled away, because heat is brought to the shell inwall with average as far as possible mode and is then left.Also should be noted that fan outside and sealing in addition at shell.
The layout of link 50 and the space between magnetic cover plate 17 and shell 1 have formed one or more runners, and this runner makes air-flow 47 flow through the whole surface of magnet and all parts of shell inwall as far as possible effectively.In this example, compare with simple convection current, be dispersed in the inner air by more effective from the heat of magnet, strong turbulent flow also is delivered to it on wall of shell 1 simultaneously.At this importantly, comparing with the structure of existing technology, is not only that the shell area that contacts with magnet is heated, thereby and uses whole area that the present invention means housing and made contributions to heat is dispersed in the ambient air by even heating.Therefore can avoid occurring the very zone of heat on the shell surface,, also can be removed for the shell rib 3 that reduces the touch area like this such as the position above magnet in the pump of existing technology especially.The heat radiation of housing obtains very big improvement, has also disappeared with shell rib 3 relevant convection problems.
In the specific example described here, be provided with lid 28 be used for part air-flow 47 be directed to position transducer 36 simultaneously this part air-flow further guided to one or more exit orifices 46.Because position transducer 36 is installed near (heat) magnet, it bears extra high temperature.Under the passive type of cooling in the prior art because low heat dissipation potential, magnet be heated to very high level simultaneously position transducer be assumed that the temperature approximate with magnet surface.Use the direct gas flow type of cooling of the present invention to mean that the temperature of position transducer 36 keeps approaching with inner temperature; Special when having settled connecting rod 31 with this, should be noted that the heat isolation that keeps abundance between the metalwork of sensor element (CCD receiver 32 and light source 33) and magnet.Certainly this also can be used for any electronic component 6 that is placed on the cap 5.It also can cool off through the straight-flow air 49 that covers.
Position transducer
As discussed, the reference element that in the example of describing, is used for position indicator is that a shade on the connecting rod 20 that extends is supplied with body 35, is used for the detection position, its shade projected on the circuit of CCD (electric coupling device) unit 32.That in example, describes is more concrete, is used for the element of activated sensors of detection position to point to an end of metering head in push mechanism.Light source 33 is LED, and optical receiver is one to have the electronics module of CCD unit 32, and it is installed in an intermediate portion, is on the sensor carrier 31 in this example.Make in process of production can be with it as a resume module independently for mounting point sensor 36 on sensor carrier 31, and can be such as Integration Assembly And Checkout and in advance with leaving final structure.In addition, the described layout that is similar to light box has been formed one contactless, as not have wearing and tearing sensor.
For fundamental function, the position of sensor is unimportant, and this position can be by deciding like constructional considerations such as space, erection sequences.In addition, described here part can change function as (light source 33, the receiver 32) of the installation that is fixed with (shade is supplied with body 35) parts that connecting rod moves.
In this example, CCD module 32 computing unit that contained a microprocessor and produce required control signal is controlled.Computing unit also can produce from a DSP (DSP digital signal processor) or discrete technology to substitute microprocessor.
Any element can both be used as light source 33, as long as it can produce an enough narrow luminous point.With geometric figure shown in Figure 7 together, this width has determined shadow region SV (also seeing Fig. 8).
Light source 33 also can be made up of several elements or a line source, produces shade SV simultaneously to satisfy special demand.An example is to produce high brightness and do not influence the acutance on the moving direction.
CCD line 32 is M optical receivers (to call pixel in the following text) of linear arrangement, and they are regularly arranged with several microns spacing.Such as this is that 64 microns of 128 pixels apportion on the length overall of about 8mm, i.e. M=128, R=64 μ m.
The control signal that computing unit produces set lighting hours and its storage is used for after processing, in each pixel of this lighting hours CCD line 32 with incident ray in the integrated amplifier that advances in the CCD module.This integrated not occurring over just during the illumination also occurs in the photosensitive surface of each pixel.After illumination, the tonal value of pixel is then read and is obtained by computing unit by the more control signal as the analogue value from the CCD module.
In simple example, throw light on and read tonal value and alternately take place.Some commercial CCD circuit configurations also might be carried out these two programs simultaneously, and wherein the illumination measurement result behind their storage integrations also discharges integrator for measure next time immediately.In illumination phase is that ensuing program is exported measurement result simultaneously and can be improved measuring speed.
Graphic display among Fig. 8 in instance the accumulative total tonal value H of the actual shade of affected pixel area.In this example, shadow region SV extends to #63 from #60.
As a kind of simple assessment process, judge that such as one lower limit Hv (in Fig. 8, representing with dashed line) is set at the half the of maximum brightness, seek simultaneously which pixel brightness value H is that first is lower than lower limit H in the shadow region v; In example pixel #62.
In other examples, brightness can be opposite direction, never illuminates and has illuminated the increase of CCD unit pixel number; This depends on that light source 33, CCD module 32 and shade supply with the inside of CCD module of layout and the use of body member 35 and form.In this example, first brightness is found out above the pixel of lower limit.
After throwing light on, read and handling three phases, just produced positional value.The terrible frequency of cumulative time decision of three phases to positional value.The solution of measuring is that the pel spacing R of CCD unit proofreaies and correct through geometrical relationship A, and this relation is provided by the mounting distance between single component.
Geometrical relationship A (see figure 9)
A＝s’/s＝x 3/x 2
Wherein
The s=shade is supplied with the actual motion of body
S '=shade is supplied with the projection campaign of body in the CCD plane
x 2=shade is supplied with the distance between body and light source
x 3Distance between=CCD plane and light source
This program has determined the position that obtains through calculating pixel, and is a digitizing program.Compare with simulator program, linear dimensions, like the deviation of module sensitivity and fluctuation in fact to not influence of result.If with actual value decision geometrical relationship A, the variation in the assembling also has only little influence so.X in a concrete instance 3=21mm, X 2=20mm, the nominal value that obtains ratio A is 1.05, promptly shade is supplied with the higher conversion of the motion of body 35 by 1.05 times of generations in the shadow region SV of a particular distance in the plane of CCD unit 32.Suppose an X 3The assembling changed factor, promptly possibly the changing of distance from light source 33 to CCD unit 32 is ± 0.3mm, and the tolerance range upper end of assembling is X 3=21.3mm and X 2=20mm, the geometrical relationship A in this example is 1.065 so.Geometrical relationship in the example change into 1.065/1.05=1.014, or+1.4%.This deviation can be eliminated through an independent correction easily, such as in the mill.Through the precision of pixel distance on how much can there is little doubt that linearity is confirmed on ground, deviation is also just little zero to leveling off to.
Although the above mode of measuring the position of shade supply body 35 and barrier film 13 provides very accurate and linear positional value, interpolation can provide a more accurate position to survey method.In the implementation of this expansion, estimate that the brightness H of pixel has produced a position result, like (see figure 10) between pixel 61 and 62, it is meticulousr than pel spacing R, is judging at the tonal value of this pixel in the zone of lower limit by interpolation.Its objective is and judge intensity map and judge lower limit H vCrossover location and through virtual position scale to value of crossing, this X value in correspondence accurately between the pixel of pixel number.
For this reason, seek the distance, delta H of the tonal value that two pixels and judgement begin from lower limit on the left side of judging lower limit Hv and right side.Shown in Figure 10 or 11:
ΔH 1＝H 1-H v
ΔH r＝H r-H v
The distance, delta X that calculates from the central shaft of per two neighbors (being pixel #61 and #62 in this example) and pixel become the multiple relation to the width of crossing, when pixel #61 during on the crossing left side (left adjacent pixel) and brightness distance, delta H formed following relationship together:
Δx 1/(Δx 1+Δx r)＝ΔH 1/(ΔH 1+ΔH r)
As (Δ x 1+ Δ x r)=1 (1 pixel wide),
Δ x so 1=Δ H 1/ (Δ H 1+ Δ H r)
When according to the pixel #62 (right adjacent pixel) on crossing the right of finding, ensuing relation comprises:
Δx r/(Δx 1+Δx r)＝ΔH r/(ΔH 1+ΔH r)
As (Δ x 1+ Δ x r)=1 (1 pixel wide),
Δ x so r=Δ H r/ (Δ H 1+ Δ H r)
In this example, the value of crossing is 61.7.If a desirable straight line is followed in the brightness in interpolation zone, two are calculated and can produce identical results so, therefore in principle both one of can be carried out.Yet, carry out two and calculate and can mistake be reduced to minimum results averaged, these mistakes be since used the not exclusively straight intensity map of transition region or since in measuring inevitable error produce.
In other examples, the crossing both sides are not illuminated with the situation that illuminates the CCD unit and can be exchanged, and like this, the function while interpolation equation that the left side and the right indicator suitably exchange them also must change thereupon.
In addition, in other possible examples, the tonal value that surpasses two pixels is used.Can determine the position through many times calculating with to several results averaged.In other possible enforcements, also can use one to be different from here the linear interpolation method of discussing or to use from the method for carrying out interpolation except the data of the pixel point of direct neighbor.
The deviation of linear dimensions only exerts an influence to the result in the interpolation zone with changing like module sensitivity.By shade supply with body be projected on the CCD plane that acutance produced was less in the slope significance of the intensity map of shade transition region less because interpolation is influenced by it; Have only the linearity of intensity map very important to the precision of interpolation.
Be independent of above-described interpolation, be based upon on the described basic principle, more methods that are used to improve sensor performance can be used more, and these methods are described below:
Anti-interference through filtering improvement
Can improve the anti-interference of sensor through filtering.Filtration can be applied to the tonal value and the position judgment result itself of pixel.First kind of situation, handle several pixels or the tonal value of the mean value that transmits several times with the method, situation in second, the position result of several initial decisions are collected in and obtain a positional value of inferring together and be used to further processing.
The compensation that changes in the assembling
In the stage that is limited, like the quiescent phase before the actual metered stroke, the positional value in this stage can and be stored in the reference memory body by decision.At active motion stage, handled with respect to the positional value of previously decided reference value.Program allows to produce deviation in the operation simultaneously in the variation of other locational fit ons at production period, like thermal expansion by compensation automatically to improve precision.
The compensating proportion mistake
In further alternative, two or more known reference positions can be used as the scale that determines position transducer.This can once accomplish or repeat in the operational phase at production phase or detection-phase.
Situation in first, the reference position is provided by external equipment, like spacing position or externally measured instrument.Measure and, can determine the corrected value of a position transducer scale and its storage is used for further processing from the positional value of these reference positions the understanding of the physical location of reference position.
In the situation that second kind of repetition ratio judged, known position is essential like the mechanical damping device or from the reference signal of other devices capable of using fixed position of fighting to the finish.If barrier film is in such known location when work, the positional value that records from this position just can produce the corrected value of a position transducer scale, and its storage is used for further processing.
The compensation of optical sensitivity parameter
In further example, the tonal value of the pixel that is illuminated fully is used to provide the typical value of an illumination intensity.For this reason, the pixel of a suitable group can be used to provide a mean value.Illumination intensity can be used to the control illumination so that scope capable of using is used by optimum; For instance, the brightness of control light source or operating time are so that the illumination intensity of the pixel that is illuminated fully is lower than the exposure limit fully of CCD module slightly.The operating time of light source is controlled through change ON/OFF ratio.In each the measurement, use the ratio that obtains in advance illumination intensity to be proofreaied and correct so that any deviation of lighting parameter, be removed such as aging.
The compensation of stain and pixel deviation
In further example, the mechanical structure of structure sensor makes in the stage that is limited, like the quiescent phase before the actual metered stroke, and pixel coverage of working fully or major part wherein can be illuminated.Be to use the shade of supplying with body towards the shade of magnet to supply with the edge such as a possible example and estimate, shade is supplied with swept-volume and is crossed sensor and make the regional blackening that is illuminated in last position of rest in the CCD unit during stroke movement for this reason.In this stage, the tonal value of all related pixels is determined and is stored in separately in the reference memory body.The measured value of single pixel and the deviation between the ideal value are compensated with the form of proofreading and correct.At active motion stage, the tonal value of each pixel at first is corrected and then only uses the reference value that obtains in advance further to proofread and correct for each the measurement.Rely on this process, by manufacture process with bring the deviation of single pixel sensitivity degree to be compensated to a certain extent because of stain, the reliability or the precision of operation are enhanced.
Certainly, the CCD receiving element also can be positioned to two rows or arrange to improve Security to prevent because of redundancy ratio like loss of data that causes because pollute or the precision of measuring through the raising of averaging more.Under the situation for king-sized length of stroke, two rows or arrange CCD more and be used for expanding single measuring range when surpassing the single function limit by merging
Output of coupling magnetic and heat output
For the advantage of the magnetic driven metering pump that utilizes controlled motion, the steady motion that especially slows down must be considered magnetic output and the active cooling method of having described in front that passes through the shell internal fan especially.(seeing " cooling of magnet and miscellaneous part " part)
When the fixed operation of control fortune is not revised operation down, the output of the magnetic of basis principle is common in magnetic driven metering pump only is applicable to a narrow scope.In order in wider scope, to make control become possibility, can react to the motion of mechanical part is absolutely necessary, even be the very fast of magnetic output change under the worst situation.
Yet in prior art constructions, magnetic coil 2 too high inductivitys can produce obstruction, therefore under magnetoelectricity stream IM, after 20-50ms, only reach nominal value.Select this common output so that approximate expectation electric current is provided together with the voltage and the impedance of winding 29 (Ohmic resistance, inductivity).In this simple case, through giving machinery supplier voltage electric current is provided, possibly deduct a tolerance; In the example of control electric current, select size so that electric current can guarantee the ceiling voltage that minimum expectation supply voltage and control wiring predefined value limit.
If magnet is suitable for controlled motion, must select so a quantity little many windings so that magnetoelectricity stream in the shortest time, be affected.When the winding space of using was even, the minimizing factor (N) of the number of windings had the influence of a power to impedance and inductivity, understands under the condition that does not change voltage with N 2Ratio electric current is risen.Power requirements as magnetic power rises with ratio N, and the time that so generally speaking reaches operating current reduces with factor N.
In ensuing example with illustrated in detail.Briefly, we suppose that the electric current of an approximately linear rises, and that is to say it is the pure induction behavior of magnetic coil 2.The magnetic coil of one existing technology can be with the speed rising magnetoelectricity stream of 0.1A/ms because of its impedance.The action required electric current of 2A reaches after 20ms after applied voltage.If operating current reaches at half the time (10ms), the number of windings is halved and the cross-section area of electric wire can double, and that is to say, the diameter of wire increases with 2 the subduplicate factor; Inductivity and winding resistance descend with the factor 4, and the situation that voltage is constant rises to 0.4A/ms following current rise time.Operating current is doubled to 4A and reaches (10ms) at former time one half.
Control ability can be used in the proper motion of slowing down by special.This flows I with magnetoelectricity MExpand to the energy loss that therefore almost continuous operation has also improved each stroke.According to realizing described function, can significantly improve heat radiation.Rely on the degree that increases, need to utilize the standard that broadens to carry out thermal design, the change mechanical realization improves heat radiation maybe.Increased and magnet operating current I that the endurance is longer MMust be through in control electronic equipment 44, using bigger module to be considered.
The use position sensor must satisfy economic factor with the application that the control diaphragm movement improves fluid characteristics and widens magnetic driven metering pump, can not cause producing the needs of all modules that design magnetic driven metering pump again.It should be noted that a large amount of use known module.This is applicable to onboard modules too, and its structure should guarantee that already used part also can be used to the may command magnetic drive pump in out of contior magnetic drive pump.
List of reference numbers
1 shell
2 magnetizing coils
3 shell ribs
4 base plates
5 outer housing covers
Electronic equipment in 6 outer housing covers
7 regulate parts
8 strokes are regulated pin
9 lids
10 guide lines
11 gears (reduction gear)
12 metering heads
13 barrier films
14 inlet valves
15 outlet valves
16 measuring rooms
17 magnetic cover plates
18 longitudinal axis
19 connecting rods
20 push mechanism
21 O shapes ring
22 push mechanism internal surfaces
23 pressure springs (recovery springs)
24 magnetic cover plate internal surfaces
25 magnetic sheets
The axle sleeve of 26 pressure head sides
The axle sleeve of 27 push mechanism sides
28 lids
29 coil winding
30 diaphragm center
31 sensor carriers
32 receivers, the CCD module
33 light sources
34 openings
35 as a reference the shade of element supply with body
36 position transducers
37 derivative units
38 set nominal value
39 compare nominal value and actual value
40 PID adjustment
41 position corrections
42 amplifiers
43 fans
44 control electronics
45 electronic power supply modules
46 flow outlet holes
47 fan airstreams
48 supply the part air-flow of position transducer
49 supply the part air-flow of cap inner electronic equipment
50 links
SV shade distribution map
H is illuminated the zone
The d dark area
#58...#65 CCD unit (pixel)
The H pixel intensity
H vThe relatively brightness of lower limit (VS)
H 1The brightness (the adjacent pixel of left-hand side) of the some leftmost pixel that intersects with VS
Δ H 1Difference between adjacent pixel intensity in left side and the brightness of comparison lower limit
H rThe brightness (the adjacent pixel of right-hand side) of the some right pixels of intersecting with VS
Δ H rDifference between adjacent pixel intensity in right side and the brightness of comparison lower limit
Δ x 1The adjacent pixel center line in left side arrives the location interval of the point that intersects with VS
Δ x rThe adjacent pixel center line in right side arrives the location interval of the point that intersects with VS
x 1Shade is supplied with body and the interplanar distance of CCD
x 2Shade is supplied with the distance between body and light source
x 3Distance between CCD plane and light source
p 1Working pressure p 1
p 2Working pressure p 2
p 3Working pressure p 3
p 4Working pressure p 4
x T1Working pressure p 1Under the dead band
x T2Working pressure p 2Under the dead band
x T3Working pressure p 3Under the dead band
x T4Working pressure p 4Under the dead band
The s shade is supplied with the actual motion of body
S ' shade is supplied with the projection campaign of body
The D metrological performance
HL machinery length of stroke
The output of SG controller
Controller output after KSG proofreaies and correct
k 1The factor that is used for the position current correction relevant with the position
k 2The factor of performance amplifier
k 3The factor of rate signal deviation
x sThe nominal value of push mechanism position
x 1The actual value of push mechanism position
x S1The Deviation Control of push mechanism position
x sThe nominal value of push mechanism speed
v 1The actual value of push mechanism speed
v S1The control of push mechanism velocity deviation
Position signal among the Pos figure
The position signal of buffering terminal point among the EPos figure
I MMagnetoelectricity stream
I MoMagnetoelectricity stream dead-center position signal among the figure

Claims (35)

1. magnetic driven metering pump; Said metering pump comprises that one is fixed on the connecting rod push mechanism and movably and is anchored at the magnetic cover plate in the pump case of a said magnetic driven metering pump, and said magnetic cover plate has the internal surface towards push mechanism, and said push mechanism has the internal surface interior surface opposing with said magnetic cover plate; So that between two said internal surfaces, form the space; Wherein, said push mechanism can move axially on the longitudinal axis in the said magnetic cover plate, thereby after energising is with the driving magnetizing coil; Push mechanism and connecting rod overcome the power of recovery springs and are drawn in the magnetic cover plate; Reduce said space and enter into the hole in the magnetic cover plate, and after magnet stops, making push mechanism turn back to initial position, thereby continue to start and stop down at magnetizing coil through recovery springs; Thereby being driven, push mechanism and elastic displacement parts vibrate; What wherein the elastic displacement parts replaced cooperates with an outlet valve and an inlet valve, in the metering head that is placed on the y direction, produces a pressure stroke and and fills stroke, it is characterized in that; One reference component (35) connects together with the module that push mechanism (20) and connecting rod (19) are formed; Survey the position of this reference component with a position transducer, wherein position transducer (36) provides one to have the actual signal (X1) of fixed relationship with the position of reference component, and the motion of the unit of being made up of push mechanism and connecting rod comes control accuracy by a control circuit so that it meets the nominal figure (38) that is scheduled to.
2. magnetic driven metering pump as claimed in claim 1 is characterized in that, position transducer (36) is surveyed the position of reference component (35) according to the no touch principle.
3. magnetic driven metering pump as claimed in claim 1, the reference component (35) that it is characterized in that linking to each other with position transducer (36) with connecting rod (19) is in the outside of metering head.
4. magnetic driven metering pump as claimed in claim 1 is characterized in that, reference component (35) influence light source (33) the path and with the position transducer (36) of its collaborative work, this sensor is fixed in the magnetic cover plate, works with the mode of photoinduction.
5. magnetic driven metering pump as claimed in claim 4; It is characterized in that; Reference component (35) is that a shade is supplied with the profile part that body or produces shade, and the position transducer (36) that is placed on the magnetic cover plate is made up of the optical receiver (32) that with form is a series of sensitization electric coupling devices (CCD).
6. magnetic driven metering pump as claimed in claim 1 is characterized in that position transducer (36) is positioned on himself the sensor carrier that fixes with the magnetic cover plate.
7. magnetic driven metering pump as claimed in claim 5; It is characterized in that light source (33), the profile part (35) of a shade supply body or a generation shade and receiver (32) have been formed a device and a measured value that is similar to light box and have been imported electronic control system continuously or off and on.
8. magnetic driven metering pump as claimed in claim 4 is characterized in that the optical receiver (32) of position transducer (36) is made up of many linear acceptors that are provided with.
9. magnetic driven metering pump as claimed in claim 8 is characterized in that, said acceptor is made up of 128 pixels.
10. magnetic driven metering pump as claimed in claim 4 is characterized in that, light source (33) is a light emitting diode (LED), its opposite that is placed in the optical receiver (32) of position transducer (36) make it the beam-pointing receiver and do not interrupted by connecting rod (19).
11. magnetic driven metering pump as claimed in claim 5; It is characterized in that; The initial value of position transducer (36) carries out interpolation by the tonal value to a large amount of pixels of shade transition region and obtains, and said shade transition region has provided to be supplied with the brightness in said a large amount of pixels that acutance produced that the profile of body or said generation shade partly is projected on the CCD plane by said shade and change.
12. magnetic driven metering pump as claimed in claim 1 is characterized in that, when handling the signal of position transducer (36), uses and filters.
13. magnetic driven metering pump as claimed in claim 1 is characterized in that, eliminates the mistake at zero point of position transducer (36) through benchmark memory.
14. magnetic driven metering pump as claimed in claim 1 is characterized in that, eliminates the error of graduation of position transducer (36) through one or more reference positions.
15. magnetic driven metering pump as claimed in claim 4 is characterized in that, controls or adjust light source (33) through the pixel brightness value that use obtains, with the illumination deviation of compensated position sensor (36).
16. magnetic driven metering pump as claimed in claim 4 is characterized in that, comes the luminance deviation between the single pixel of compensate for optical receiver (32) through use benchmark memory for the susceptibility of each pixel.
17. magnetic driven metering pump as claimed in claim 1 is characterized in that, reads the signal (x of the sensor (36) from the position 1) in a control gear, further handled and compare with nominal value (38), wherein control gear influences the electric current (I of magnetizing coil (2) M) so that motion is proofreaied and correct.
18. magnetic driven metering pump as claimed in claim 17 is characterized in that, control gear alternately influences position, speed or the acceleration of push mechanism (20) or elastic displacement parts (13) through the mode that changes coil current.
19. magnetic driven metering pump as claimed in claim 17 is characterized in that, in filled stage and/or pressure stage, descends in order to offset by the moving pressure that causes of anti-current, control gear can reduce the speed of push mechanism (20) intentionally.
20. magnetic driven metering pump as claimed in claim 19 is characterized in that, the moving generation that comprises cavitation erosion of said anti-current.
21. magnetic driven metering pump as claimed in claim 17; It is characterized in that; The length of stroke of expectation is transferred to control gear through an operator, and controls magnetizing coil (2) through the electronics mode and come with control gear the limit movement of push mechanism (20) to the length of stroke that will carry out.
22. magnetic driven metering pump as claimed in claim 17 is characterized in that, the value that stroke is adjusted to be by the measurement result of position transducer (36) in metering process directly decision.
23. magnetic driven metering pump as claimed in claim 17; It is characterized in that; Control gear is in the starting point in pressure stage and/or the speed of terminal point restriction push mechanism (20); That is to say,, make because the quick change of metered dose flow velocity or clash into the pressure peak that mechanical buffer causes strongly and avoided through control magnetizing coil (2) in first or last three/part of motion.
24. magnetic driven metering pump as claimed in claim 17 is characterized in that, the terminal point in the pressure stage passes through control magnetizing coil (2), and the speed of control gear restriction push mechanism (20) is avoided the influence of under low back pressure, transshipping.
25. magnetic driven metering pump as claimed in claim 17; It is characterized in that; Control gear drives drive motor (2) in the pressure stage through the time that recurrence rate was determined with the metering stroke; Distributing push mechanism (20) motion forward, thereby even under the slow situation of the ten minutes of metering stroke a few minutes, metered dose is disperseed as far as possible equably.
26. magnetic driven metering pump as claimed in claim 25; It is characterized in that; When the operation of continuous metering almost, that is to say start and next metering stroke between under the situation that not have in fact to pause, control gear becomes stroke movement and has a kind ofly reduced length of stroke and improved stroke frequency; The operation that in the metering stroke, almost keeps elastic displacement parts speed; It produces the metrological performance of expectation, and is resumed mechanical damping device or stroke that spring (23) is pushed into the place ahead fully in push mechanism (20) and regulates pin (8) and stop filling through control magnetizing coil (2) before, so that (I is flowed with magnetoelectricity in the mobile space that occurs over just of push mechanism M) require little stroke path regional.
27. magnetic driven metering pump as claimed in claim 17 is characterized in that, in the controlled proal incipient stage of push mechanism (20), control gear itself or another control unit are observed the electric current (I of said magnetizing coil (2) M); Therefrom infer power and determine the unlatching of outlet valve (15); Under the help of this observation, measure the dead band that causes by elastic displacement parts (13) resiliently deformable; And influence actual stroke path through having a mind to stop stroke movement according to determined elastic displacement part distortion, so that the error that is caused by the elastic displacement part distortion relevant with stroke or metered volume is eliminated and fully reduces the dependence of metered amount to back pressure.
28. magnetic driven metering pump as claimed in claim 17; It is characterized in that when when reducing the work of stroke pattern; Control gear is through having a mind to stop the actual stroke path that stroke movement influences the measurement dead band that resiliently deformable operation, that depend on elastic displacement parts (13) causes during push mechanism (20) travels forward, so that the error that is caused by the elastic displacement part distortion is eliminated and substantially improves the linear dependence of metered amount to the length of stroke percentage of setting.
29. magnetic driven metering pump as claimed in claim 1; It is characterized in that; During push mechanism (20) travels forward; Control gear measures because the measurement dead band that the resiliently deformable of elastic displacement parts (13) causes, and from the dead band of said measurement, can estimate operation pressure and when surpassing a given pressure maximum value, the adjustment metering is to avoid further pressure rising.
30. magnetic driven metering pump as claimed in claim 1 is characterized in that, has comprised that the inside of pump case of the said magnetic driven metering pump of magnet and electronic equipment (6,44) is cooled.
31. magnetic driven metering pump as claimed in claim 30; It is characterized in that for cooled interior be placed in assembly wherein, settle an air-flow to be directed and around pump case (1) inwall of the wall of magnetic cover plate (17) and/or coil winding (29) and said magnetic driven metering pump and the fan of other assembly.
32. magnetic driven metering pump as claimed in claim 30 is characterized in that for cool position sensor (36), a part of air-flow (48) is drawn towards on it.
33. magnetic driven metering pump as claimed in claim 32 is characterized in that the conduction surfaces and/or the runner that link to each other with stroke lid (28) guide to said a part of air-flow (48) on the position transducer (36).
34. magnetic driven metering pump as claimed in claim 32 is characterized in that another part air-flow (49) quilt is caused on the electronic equipment (6) that is placed in the cap (5).
35. magnetic driven metering pump as claimed in claim 30, it is characterized in that magnetic cover plate (17) is positioned in the pump case (1) of said magnetic driven metering pump so that it around cooling usefulness arranged air ring around.
CN200710101636A 2007-02-16 2007-02-16 Magnetic driven metering pump Active CN101245776B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN200710101636A CN101245776B (en) 2007-02-16 2007-02-16 Magnetic driven metering pump
HK09100084.8A HK1123081A1 (en) 2007-02-16 2009-01-06 Magnetic drive metering pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN200710101636A CN101245776B (en) 2007-02-16 2007-02-16 Magnetic driven metering pump

Publications (2)

Publication Number Publication Date
CN101245776A CN101245776A (en) 2008-08-20
CN101245776B true CN101245776B (en) 2012-08-29

Family

ID=39946408

Family Applications (1)

Application Number Title Priority Date Filing Date
CN200710101636A Active CN101245776B (en) 2007-02-16 2007-02-16 Magnetic driven metering pump

Country Status (2)

Country Link
CN (1) CN101245776B (en)
HK (1) HK1123081A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102435239B (en) * 2011-10-25 2012-12-19 上海大学 Signal processing method of automatic zero-point electromagnetic flow meter and system thereof
DE102014119654A1 (en) * 2014-12-29 2016-06-30 Brötje-Automation GmbH Method for compensating for a deviation of a working point
CN109099200B (en) * 2018-09-30 2023-09-15 浙江理工大学 Electromagnetic pressure reducing ball valve
CN110030189B (en) * 2019-04-24 2020-11-27 阿奥艾斯海洋工程(上海)有限公司 Vibration damper of liquid pump
CN113236523B (en) * 2021-05-11 2022-03-15 浙江威邦机电科技有限公司 Wireless low-noise water pump

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1161414A (en) * 1995-11-15 1997-10-08 松下电器产业株式会社 Vibrating compressor
US6174136B1 (en) * 1998-10-13 2001-01-16 Liquid Metronics Incorporated Pump control and method of operating same
CN1321262A (en) * 1999-07-31 2001-11-07 亨特莱佛技术公司 Compressor drive
EP1344933B1 (en) * 1998-04-20 2006-01-11 Matsushita Refrigeration Company Improved drive structure of linear compressor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1161414A (en) * 1995-11-15 1997-10-08 松下电器产业株式会社 Vibrating compressor
EP1344933B1 (en) * 1998-04-20 2006-01-11 Matsushita Refrigeration Company Improved drive structure of linear compressor
US6174136B1 (en) * 1998-10-13 2001-01-16 Liquid Metronics Incorporated Pump control and method of operating same
CN1321262A (en) * 1999-07-31 2001-11-07 亨特莱佛技术公司 Compressor drive

Also Published As

Publication number Publication date
CN101245776A (en) 2008-08-20
HK1123081A1 (en) 2009-06-05

Similar Documents

Publication Publication Date Title
CN101245776B (en) Magnetic driven metering pump
CN101310109B (en) Control system for electromagnetic pumps
KR100275916B1 (en) Voice Coil Drive Positioner for Positioning Magnetic Heads in Multitrack Tape Drives
AU618783B2 (en) Low vibration resonant scanning unit for miniature optical display apparatus
CN101245770B (en) Electromotor driven metering pump
US7219691B2 (en) Control valve positioner mounting system
US5115195A (en) System and method for measuring the absolute position of one body which is constrained to move with respect to another body
NO302895B1 (en) New polyamides and articles made therefrom
US4941265A (en) Apparatus for preventing changes of the positions of machines
KR102317127B1 (en) Actuation mechanism, optical apparatus and lithography apparatus
US4461984A (en) Linear motor shuttling system
WO2006116330A3 (en) Monitoring scan mirror motion in electro-optical readers and image projectors
US7600472B2 (en) Pump control mechanism, printer using the same and pump control method
EP0899678A2 (en) Autofocus bar code reader
CN101218861A (en) Electronic component mounting apparatus, height detection method for electronic component, and optical-axis adjustment method for component height detection unit
US7243439B2 (en) Touch sensor
WO2023103724A1 (en) Two-stage multi-degree-of-freedom space position precision stabilization system
US9577562B2 (en) Method and apparatus for back electromotive force (EMF) position sensing in a cryocooler or other system having electromagnetic actuators
KR100774543B1 (en) Apparatus for compensating vibration of digital camera
DE59403413D1 (en) Expansion valve for refrigerants
US20140001387A1 (en) Drive device for a valve, valve for controlling a gas and/or liquid flow
KR102002814B1 (en) Extensometer for sit(structural integrity test) of nuclear power plants
US5138373A (en) Copier or printer component position floating magnetic actuator
JP2004270696A (en) Device to distribute and feed volatile component of fuel to intake pipe
EP0757270A1 (en) Autofocusing device

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
REG Reference to a national code

Ref country code: HK

Ref legal event code: DE

Ref document number: 1123081

Country of ref document: HK

C14 Grant of patent or utility model
GR01 Patent grant
REG Reference to a national code

Ref country code: HK

Ref legal event code: GR

Ref document number: 1123081

Country of ref document: HK

C56 Change in the name or address of the patentee

Owner name: EXCELLENCE CO., LTD.

Free format text: FORMER NAME: EXCELLENCE DOSE TECHNOLOGY CO., LTD.

CP03 Change of name, title or address

Address after: German Hydes Aalborg

Patentee after: Excellence Co., Ltd.

Address before: Heidelberg

Patentee before: Excellence Dose Technology Co., Ltd.