CN103210216B - Membrane pump and control method thereof - Google Patents

Membrane pump and control method thereof Download PDF

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Publication number
CN103210216B
CN103210216B CN201180040470.5A CN201180040470A CN103210216B CN 103210216 B CN103210216 B CN 103210216B CN 201180040470 A CN201180040470 A CN 201180040470A CN 103210216 B CN103210216 B CN 103210216B
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pressure
spring element
barrier film
hydraulic
pumping chamber
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CN103210216A (en
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H·弗里齐
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Excellence Co Ltd
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Excellence Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
    • F04B43/06—Pumps having fluid drive
    • F04B43/067—Pumps having fluid drive the fluid being actuated directly by a piston
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/0009—Special features
    • F04B43/0081—Special features systems, control, safety measures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B45/00—Pumps or pumping installations having flexible working members and specially adapted for elastic fluids
    • F04B45/02—Pumps or pumping installations having flexible working members and specially adapted for elastic fluids having bellows
    • F04B45/033—Pumps or pumping installations having flexible working members and specially adapted for elastic fluids having bellows having fluid drive
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/14—Pistons, piston-rods or piston-rod connections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2210/00—Working fluid
    • F05B2210/10—Kind or type
    • F05B2210/11—Kind or type liquid, i.e. incompressible
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S417/00—Pumps

Abstract

The present invention relates to a kind of membrane pump, it comprises pumping chamber, pressure and suction attachment, wherein pressure is connected with pumping chamber with suction attachment, wherein pumping chamber and hydraulic cavities are separate by barrier film, the working fluid pressure of wherein pulsing can be applied to the hydraulic cavities that can be filled with working fluid, its septation is moved between primary importance and the second place, in primary importance, pumping chamber has less volume, in the second place, pumping chamber has larger volume, wherein hydraulic cavities connects working fluid reservoir by leakage compensation valve, its septation comprises the spring element with the first spring constant, this spring element is arranged to it and is applied the first pre set force towards the direction of the second place to barrier film. for a kind of membrane pump and control method thereof are provided, above-mentioned problem can reduce even completely and overcomes thus, the suggestion according to the present invention, spring element can replace with another kind of spring element, this another kind spring element is designed to it, along the direction of the second place, barrier film is applied to the second pre set force, or the power being applied on barrier film along the direction of the second place by spring element is adjustable.

Description

Membrane pump and control method thereof
Technical field
The present invention relates to a kind of membrane pump and a kind of method that regulates membrane pump.
Background technology
Membrane pump generally includes the pumping chamber separating with hydraulic cavities by barrier film, and wherein the connection of pumping chamber sucks and connectsHead and compression fittings. Pulsation working liquid pressure can be applied to hydraulic cavities, and this hydraulic cavities can be filled with workLiquid. Pulsation working liquid pressure causes the pulsation of barrier film, therefore the volume in pumping chamber periodically expand andDwindle. In such a way, in the time that the volume in pumping chamber expands, pumped medium can be inhaled by suction attachmentEnter, suction attachment is connected to pumping chamber by corresponding check-valves, and in the time that the volume in pumping chamber dwindles,Pumped medium discharges under pressure by compression fittings, and this compression fittings is also connected to by corresponding check-valvesPumping chamber.
Conventionally, hydraulic fluid is hydraulic oil. But, for example water miscible ore deposit of other suitable fluids substantiallyMaterial supplements material and also can use.
Barrier film is separated medium and the drive unit for the treatment of pumping, therefore, prevents due to pumped medium on the one handDestroy drive unit, on the other hand, also prevent the infringement to pumped medium that caused by drive unit, for examplePollute.
Pulsation working liquid pressure is produced by the moveable piston contacting with hydraulic fluid conventionally.
For this reason, for example, piston moves back and forth in the element of cylindrical hollow, and therefore the volume of hydraulic cavities expandsLarge and dwindle, cause the pressure in hydraulic cavities raise and reduce, thereby make diaphragm movement.
Although having the object of very multiple types measure is to prevent that hydraulic fluid from flowing through piston, in fact, noCan prevent a small amount of hydraulic fluid in each stroke from staying on the one hand piston and cylindrical hollow unit on the other handNarrow gap loss between part, therefore, little by little, the amount of the hydraulic fluid in hydraulic cavities is to reduce. This causes in fact compression travel no longer to complete by barrier film, because can not obtain sufficient hydraulic fluidCarry out the compression movement of barrier film.
So, for instance, DE1034030 proposes by establishing valve, so-called leakage compensation valve is liquidPress chamber to be connected to the reservoir of hydraulic fluid.
By this leakage compensation valve, hydraulic fluid can be augmented hydraulic cavities as required. But, do like thisTime must be very careful, can not increase too many hydraulic fluid to hydraulic cavities, otherwise during pump pressure stroke,Barrier film will move too far away in pumping chamber, may touch in some cases valve or other elements, and byThis damage.
Therefore, leakage compensation valve generally includes and is for example the closure body of cutting out spherical form, and it can be at valveBetween the closed position of closing and the open position of valve open, move back and forth. This closure body utilize pressure elements,For example spring-biased is to closed position. This pressure elements designs like this, establishes when the pressure in hydraulic cavities is less thanConstant-pressure pLTime, closure body only moves along the direction of open position. For Leakage prevention recuperation valve is suckingIn stroke, open prematurely in the time that piston moves backward and make thus the volume of hydraulic cavities expand, barrier film is logicalOften with spring element, this spring element is designed to again spring and on barrier film, applies power and make barrier film to hydraulic cavitiesDirection skew. In such a way, spring element contributes to barrier film to move along the direction of its suction stroke.
Conventionally, compression pump requires for example 5000 to 10000 the service hour of operation one period of predetermined time and does not needSafeguard or repair.
In order to ensure this requirement, must ensure that the work section of barrier film follows the action of piston all the time, and protectBe held in as in its set dome chamber, this dome chamber is made up of pumping chamber and hydraulic cavities.
Therefore,, if there is for a certain reason too many hydraulic fluid to enter hydraulic cavities, barrier film will be along compression travelDirection departs from piston movement, and before piston completes compression travel, barrier film collides the wall in pumping chamber thus, andOn the hole of leading to valve, bore a hole.
Because perforation causes the fault of membrane pump, importantly avoid such situation.
Thus, the most important thing is, leakage compensation valve be only dimensioned to ending at suction stroke at barrier filmWhile being placed on the dome of hydraulic pressure side, just open. This causes of short duration negative pressure, and spring-loaded leakage is mended thusRepay that valve is opened and hydraulic cavities is supplemented the accurately hydraulic fluid of the loss of amount.
If leakage compensation valve arrives it at barrier film and opened before the extreme position of hydraulic pressure side, barrier film perforationDanger occur all the time. For fear of this situation, if barrier film is placed on dome, in suction strokePressure in hydraulic cavities can only ease down under the setting pressure of leakage compensation valve.
In addition,, in the time that pump stops, even produce negative pressure in pumping chamber, the pressure in hydraulic cavities must be extremelyBe 1 bar (=atmospheric pressure) less, because otherwise, exist owing to leaking all the time, barrier film will be along compressed lineThe direction motion of journey, and a small amount of fluid will flow into by piston or by leakage compensation valve, and this will leadCause barrier film bores a hole in the time of pump startup.
In order to meet at any time this situation, EP1291524 proposes spring force to be arranged in suction stroke,If there is vacuum in pumping chamber, barrier film is also followed piston, is applied to work by barrier film by spring forceThe pressure of liquid exceedes 1 bar all the time. Only in suction stroke ending, be positioned at the hydraulic cavities side of dome when barrier filmWhen end, this pressure just declines, because barrier film can not be followed piston thus again. At that time, hydraulic fluid can be mustWhile wanting, add by leakage compensation valve.
Because because pressure reduction acts on diameter D square proportional of power F on barrier film and barrier film, but withTime to be applied to surperficial shearing force and the bending force of clamping rim of barrier film only proportional with diameter, shear stressThe diameter D of barrier film increases pro rata relatively; Like this, especially large-scale membrane pump, this may cause barrier filmOverload, and before expiring normal service life, cause subsequently the breakage of barrier film.
Because the increase of spring force F and D2Proportional, the pressure with at least 1 bar in major diameter barrier film is wantedAsk very powerful and expensive spring thus. For instance, the diaphragm diameter of 100mm requires the bullet of 750NSpring power, and the diaphragm diameter of 400mm has needed the spring force of 12000N.
Summary of the invention
From the description of prior art, the object of this invention is to provide a kind of membrane pump and control method thereof, thusCan reduce and overcome above-mentioned problem even completely.
For this membrane pump, this by a kind of with pumping chamber, pressure and suction attachment and hydraulic cavitiesMembrane pump is realized, and wherein, pressure is connected with pumping chamber with suction attachment, wherein pumping chamber and hydraulic cavitiesSeparate by barrier film, pulsation working liquid pressure can be applied to the hydraulic cavities that is filled with hydraulic fluid,Barrier film moves between primary importance and the second place, and in primary importance, pumping chamber has little volume, andThe second place, pumping chamber has larger volume, and hydraulic cavities is connected to hydraulic fluid storage by leakage compensation valveHold device, its septation comprises spring element, this spring element be arranged to it towards the direction of the second place to barrier filmApply the first pre set force. According to the present invention, spring element can replace with another kind of spring element, and this is anotherSpring element is designed to it, along the direction of the second place, barrier film is applied to second pre set force, or, by bulletThe power that spring element puts on barrier film along the direction of the second place is adjustable.
Because the adjustability of spring element or convertibility, spring force can match with main situation, exampleAs the static pressure at suction attachment place. For example, if for the static pressure at suction attachment place itself be 1 barExpect that application sets up spring force, and the inlet valve that suction attachment is connected to pumping chamber is designed to it is exceedingUnder the pressure reduction of 0.3 bar, open, the pressure in pumping chamber can not be reduced under 0.7 Palestine and Israel. Therefore, spring elementPart also must apply less power to barrier film, and this has increased service life further.
Like this, according to the present invention, the spring force of spring element can match with local environment.
According to preferred embodiment, spring element can be pulled down from barrier film. Like this, spring element can be replacedChange, and needn't change barrier film. But, substantially can also make barrier film itself there is suitable elasticity.
In addition, maybe advantageously, be provided with hydraulic pressure body and diaphragm body, barrier film is clamped in this hydraulic pressure body and barrier filmBetween body, thereby hydraulic cavities is arranged in hydraulic pressure body, and pumping chamber is arranged in diaphragm body, wherein hydraulic pressureBody comprises the closable opening arranging along the direction of the power of spring element, and by this opening, spring element can quiltReplacing or its spring constant are adjustable. Conventionally, driven plunger is configured in spring element along the direction of powerAfterwards, therefore, only rely on the very time-consuming pump of disassembling just may change or regulating spring element. ThisThe closable opening of invention means, now, has assembled and has set up at suction attachment place at pumpAfter static pressure, can be according to circumstances regulating spring constant easily. Substantially, spring element can also be establishedPut in pumping chamber. In this case, advantageously, diaphragm body comprises along the direction of the power of spring elementSet closable opening, by this closable opening, spring element can be replaced or regulate.
In another preferred embodiment, pulsation hydraulic fluid is supplied to hydraulic cavities by passage, and wherein passage extremelyFew region in it leads to hydraulic cavities is directed like this, that is, passage is with respect to the side of the power of spring elementSynform is α at angle, and this angle [alpha] is greater than 0 degree, is preferably greater than 45 degree, particularly preferred 70 degree that are greater than,Most preferably be greater than 90 degree. Because cause like this pulsing, hydraulic fluid is supplied to hydraulic cavities from the side, existsCan approach the sufficient space of spring element, with regulating spring or " from the back side ", from that side of deviating from barrier film moreChange spring.
For the method that regulates membrane pump, above-mentioned object is by providing such step to complete, wherein by bulletThe pressure p that is applied to hydraulic fluid by barrier film by spring element is selected or be adjusted to spring constant like thisFVBe:pFV>pA-pSO, wherein pAAtmospheric pressure, pSOIt is the static pressure at suction attachment place.
In another preferred embodiment, the pressure p of hydraulic fluid will be applied to by spring elementFVBe chosen to:
pA>pFV>pA-PSO。
This guarantee can not supplied with too many hydraulic fluid to hydraulic cavities by leakage compensation valve. But, canThe power that is applied to hydraulic fluid by spring element is chosen to obtain than common situation is in the prior art littleMany, this is because according to the present invention, allows first static pressure to put on suction attachment, so that in pumping chamberCan not there is low pressure.
Because in certain embodiments, suction attachment connects pumping chamber by check-valves, and this check-valves also hasSuitable spring element, thereby, check-valves only the pressure in pressure and the pumping chamber at suction attachment place itBetween have pressure differential deltap pSVIn time, opens, and in a preferred embodiment, is applied to the pressure of hydraulic fluid by spring elementpFVSet maintenance following formula: p forA>pFV>pA-pSO+ΔpSV。
In another preferred embodiment, hydraulic cavities is connected to hydraulic fluid reservoir by leakage compensation valve, itsMiddle leakage compensation valve comprises closure body, what this closure body can be at the closed position of valve closing and valve openReciprocally motion between open position, this closure body utilizes pressure elements to be maintained in its closed position, wherein pressureElement is design like this, that is, if the pressure in hydraulic cavities is lower than setting pressure pL, closure body is along beatingThe direction motion of open position. Advantageously, the pressure elements of leakage compensation valve and the spring element of barrier film are like thisStructure and layout, that is, at any time, the pressure p in hydraulic cavitiesHBe applied to work by spring elementMake the pressure p of liquidFVSum is than setting pressure pLHigher.
In another preferred embodiment, the Quality Design of closure body becomes to work as due to the pressure pulse in hydraulic cavitiesWhile making pressure drop to 0 bar to continue to be no more than 1ms, closure body moves and is no more than 0.2 along the direction of open positionMm, is preferably no more than 0.1mm.
Brief description of the drawings
From description and the accompanying drawing of preferred embodiment below, the further advantage of the application, feature and feasibleApplication will become apparent, wherein:
Fig. 1 is according to the schematic sectional view of membrane pump head of the present invention;
Fig. 2 is pressure in hydraulic cavities key diagram in time; With
Fig. 3 is the cutaway view of custom-designed leakage compensation valve.
Detailed description of the invention
Fig. 1 illustrates the details of membrane pump head with cutaway view. Membrane pump comprises barrier film 1, and this barrier film is held inBetween hydraulic pressure body and diaphragm body. Dome-type chamber is separated into pumping chamber 9 and hydraulic cavities 8 by barrier film. Barrier film 1 passes throughBe threaded and be connected with bolt, this barrier film is pulled in hydraulic pressure body by spring element 10. In other words, springElement 10 applies power along the direction of hydraulic cavities 8 to barrier film 1.
Pumping chamber 9 is connected to suction attachment (not shown) and compression fittings (not shown) by suitable valve.The hydraulic pressure of vibration can be applied to barrier film 1 by passage. If in passage, pressure raises, the barrier film 1 in Fig. 1Move to left side, shrink in pumping chamber 9. Any pumped medium so is wherein pressed from compression fittings by valveGo out. If the pressure in passage reduces, spring element 10 guarantees that barrier film returns in hydraulic cavities. At pumpSend pressure in chamber 9 to decline until lower than the static pressure of suction attachment. Then, pumped medium is passed through suction attachmentBe supplied to pumping chamber 9.
Periodically move by means of barrier film, pumped medium is periodically from suction attachment sucking-off, and passes throughCompression fittings discharges under higher pressure. Barrier film remains between clamping rim 11,12. Spring element 10Can impel barrier film to heave.
When operation, under certain conditions, due to the leakage that pulsation working liquid pressure causes, hydraulic fluid warpSpilt by piston. In order to ensure the hydraulic fluid that has appropriate amount in hydraulic cavities 8, be provided with leakage compensation valve 6,Hydraulic cavities 8 is connected to hydraulic fluid reservoir by this leakage compensation valve. This leakage compensation valve 6 comprises bead 16,This bead is shifted onto in valve seat by spring 17. The spring 17 of leakage compensation valve 6 is set up setting pressure pL. If at liquidPress the pressure drop in chamber 8 to arrive this setting pressure pLUnder, the ball of leakage compensation valve rises from valve seat, additionalHydraulic fluid can from conventionally in atmospheric pressure the hydraulic fluid reservoir 15 of (1 bar) flow into hydraulic pressureChamber 8, until the pressure rise in hydraulic cavities 8 is to setting pressure pLOn, because leakage compensation valve 6 at this momentSpring forces ball to return in valve seat, and valve-off thus.
In the embodiment shown, in Hydraulic Elements 23, be provided with and can pass through the opening of cover cap closure. If fromHydraulic pressure body removes cover cap, can approach spring element 10. In such a way, spring element can be easyGround is changed or is reset, to guarantee applying as far as possible little power by spring element 10 to barrier film, but really simultaneouslyProtecting leakage compensation valve 6 only opens when needed.
This easy accessibility is feasible, because pulsation hydraulic fluid supplements by passage, passage is basicUpper to become the angle setting of 90 degree with the direction of the power of spring element 10.
Fig. 2 is illustrated in suction stroke the pressure in hydraulic cavities over time with diagram. Sucking rowWhen journey starts, the pressure of the pumped medium that the pressure in hydraulic cavities is approximately discharged from compression fittings with pump equates.This pressure is substantially high than the static pressure of suction line. Should be understood that, the pressure in hydraulic cavities also passes throughBack-moving spring 10 is determined.
In the time that piston moves to produce pulsation working liquid pressure backward, suction stroke starts. At first, this meaningThe pressure that taste in hydraulic cavities reduces at leisure, and because the pressure in pumping chamber is higher, barrier film fortuneMove right side, move along the direction of hydraulic cavities. At this, the pressure in pumping chamber declines at leisure, straightReach the static pressure p at suction attachment place to itSO. If when pressure declines further, pumping chamber and suction are connectThe corresponding check-valves that head connects will be opened, and pumped medium will flow into by suction attachment. In pumping chamberIn pressure while reaching the static pressure at suction attachment place, the sharply variation that produces fluid velocity in suction line.The variation of this speed Δ V causes so-called You Kaosiji (Joukowsky) pulse, Δ pST＝ρ×a×ΔV，Wherein ρ is the density of pumped medium, and a is the wave propagation rate in fluid-filled suction line. At pumpSend You Kaosiji (Joukowsky) pulse in chamber to produce the pressure pulse in hydraulic cavities, because described two chambeiesConnect by barrier film. Originally, can ignore the pressure wave of high frequency, quick decay for discussion below.
The motion backward of piston makes the pressure drop in hydraulic cavities. Like this, utilize spring element 10, must be rightHydraulic fluid in hydraulic cavities applies enough power, and therefore, the pressure in hydraulic cavities can not drop to leak to be mendedRepay under the setting pressure of valve because otherwise leakage compensation valve will open, and additional hydraulic fluid will supplyBe given to hydraulic cavities.
Known membrane pump is equipped with suitable back-moving spring 10 thus, and this ensures under any circumstance, at liquidPress the pressure ratio setting pressure in chamber high. Because the pressure in pumping chamber can not be reduced to below zero, andPressure in hydraulic fluid reservoir is generally under atmospheric pressure (1 bar), even if spring is chosen to inhalingWhen entering stroke and finishing,, when spring has been pulled to barrier film its turning point in hydraulic cavities, pressure is greater than 1Bar. Even if this guarantee in the worst case, also there will not be and make the leakage compensation valve situation of opening outside the plan.
But according to the present invention, the power that should guarantee to be put on by back-moving spring 10 barrier film is adjustable, because ofFor membrane pump is applied conventionally in such environment, that is, be applied to the static pressure p at suction attachment placeSOBe greater than zero.In this embodiment, according to applied pressure, spring force can reduce, to prevent that barrier film is by spring element 10Unnecessarily be pulled to strong in hydraulic cavities. The power of setting is lower, and the service life of barrier film is longer. In addition,Can also simplify the drive unit of pump, because the little spring power that it only must antagonistic spring element 10.
The power that is applied to barrier film by adjustment of the present invention by spring element 10, the energy consumption of membrane pump can be significantlyReduce.
After, if membrane pump need to be adjusted to another static pressure on suction line, only need to regulate bulletSpring element 10 or replaced with another.
Structure of the present invention can realize this in the situation that not incurring great expense.
Mention, after suction stroke s starts certain hour, the pressure p in hydraulic cavitiesHSuddenly(the Δ p of the temporary time interval declinesST). In the near future, pressure rise to sharp again produce high frequency,The pressure oscillation (You Kaosiji (Joukowsky) pulse) of decay fast. Directly can see,Large pressure pulse can cause pressure decreased to p=0. But in fact the pressure in hydraulic cavities can not fallBe as low as zero, but be reduced to minimum pressure pMinimum, this minimum pressure is established by running parameter and the structure of membrane pumpFixed.
Because pressure temporarily declines, pressure may be reduced to setting pressure pLUnder, therefore leakage compensationValve is opened.
For fear of being reduced to p at pressure pulseMinimum nIn time, opens, and in the prior art, conventionally will select to leak to mendRepay the setting pressure of valve, so that pL<pMinimum. Then, such result is to take suitable structural measureTo ensure in the time that suction stroke ends up, when the hydraulic fluid comprising in hydraulic cavities is very little time, pressure is by realityOn be reduced under the setting pressure of leakage compensation valve. This has increased the cost of membrane pump.
Like this, suggestion increases the quality of the closing element of leakage compensation valve, so that continue to reach the pressure of 1 millisecond of timePower pulse deficiency is so that closure body motion exceedes 0.1 millimeter.
But this creationary measure means, setting pressure pLCan be chosen as substantially higher than pMinimum, onlyWant pLLower than the average pressure p in hydraulic cavitiesm。
The present invention is based on such fact, pressure pulse is only at very of short duration time interval Δ ts < 1 milliIn second, occur.
According to the present invention, the quality of closure body is selected littlely even as big as such pressure pulse is only causedIn 0.2 millimeter or be preferably less than the rising of 0.1mm.
Suitable leakage compensation valve shown in Fig. 3.
This leakage compensation valve comprises the closure body 16 being contained in valve body 18, and it comprises closing element 20, this passClose the opening of element in closed position valve body 18, so that arrive pipeline and the liquid of hydraulic fluid reservoir 19Press chamber 8 to separate. This closure body utilizes spring element 17 to be biased to closed position, as shown in Figure 3. Hydraulic fluidThe pressure of the hydraulic fluid in reservoir and the pressure in pipeline 19 keep constant substantially. When hydraulic cavities 8In pressure decreased to the setting pressure p substantially being provided by spring 17LUnder time, be in shown in Fig. 3The closure body 16 of position moves upward, so that the joint between pipeline 19 and hydraulic cavities 8 is opened.
Substantially, suppose the 2mm if closure body only moves, the gap between valve body 18 and closure body 20Be not enough to by pipeline 19, a large amount of hydraulic fluids is discharged in hydraulic cavities.
Therefore the stroke of closure body, calculates as follows:
&Delta; s = b &CenterDot; &Delta;t 2 2 - - - ( 1 )
Wherein Δ t is the duration of pressure pulse, and b is the acceleration of the closure body that causes due to pressure pulse.Acceleration calculation is as follows:
b＝F/m(2)
Wherein F is the power acting on closure body, and m is the quality of closure body. Like this, Wo Menyou:
&Delta; s = F m &CenterDot; &Delta;t 2 2 - - - ( 3 )
Or
m = &Delta;t 2 2 &Delta; s &CenterDot; F - - - ( 4 )
Assumed stress pulse can not continue to exceed 1 millisecond, i.e. Δ ts=1 millisecond, and the motion of closure body should beGreatly 0.1 millimeter, Δ s that is to says=0.1 millimeter, when pressure pulse by hypotension to 0 bar, i.e. pressurePulse and setting pressure pLAmplitude identical, i.e. 0.7 bar, for the diameter of 8 millimeters of closing element,The corresponding about 0.5cm of surface area2。
F＝pL·A＝0.7·10·0.5＝3.5N(5)
And therefore
m = 3.5 &CenterDot; 10 - 4 2.10 - 4 = 1.75 &CenterDot; 10 - 2 k g = 17.5 g - - - ( 6 )
So, in the embodiment shown, the quality of closure body must be at least 17.5g, to prevent closure bodyMotion exceedes 0.1 millimeter.
If the quality sorting of closure body is selected to and is this size, even if pressure pulse can not make to close to 0 bar yetBody moves to as far as a large amount of hydraulic fluids being discharged in hydraulic cavities.
Consider that pressure pulse can not cause pressure decreased conventionally to 0 bar but to minimum pressure pMinimum, instituteThe method of stating can be improved further. So, in superincumbent equation (5), substitute setting pressure pL，Can use because pressure pulse is at setting pressure pLWith minimum pressure pMinimumBetween difference pL-pMinimum, matter like thisAmount can further reduce. Or, setting pressure pLCan increase, spring 17 can be manufactured thusSofter, thus the operation of simplification pump.
Reference numerals list
1 barrier film
6 leakage compensation valves
8 hydraulic cavities
9 pumping chambeies
10 spring elements
11,12 clamping rims
15 hydraulic fluid reservoirs
16 balls
17 springs
18 valve bodies
19 pipelines
20 closing elements

Claims (14)

1. a membrane pump, this membrane pump comprises:
Pumping chamber;
Compression fittings and suction attachment,
Wherein, described compression fittings and suction attachment are connected to described pumping chamber;
Hydraulic cavities,
Wherein, described pumping chamber and described hydraulic cavities are separate by barrier film,
Wherein, pulsation working liquid pressure is applied to described hydraulic cavities, and described hydraulic cavities is filled with hydraulic fluid,
Wherein, described barrier film moves between primary importance and the second place, in described primary importance, described inPumping chamber has less volume, and in the described second place, described pumping chamber has larger volume, wherein,Described hydraulic cavities is connected to hydraulic fluid reservoir by leakage compensation valve,
Wherein, described barrier film comprises the spring element with the first spring constant, by described spring element designBecome described spring element, along the direction of the described second place, described barrier film is applied to the first pre set force; Its feature existsIn, described spring element can be changed by another spring element, and described another spring element is designed to described anotherOne spring element can be along the direction of the described second place to applying the second pre set force on described barrier film, or, byThe first pre set force that described spring element puts on described barrier film along the direction of the described second place is adjustable.
2. membrane pump according to claim 1, is characterized in that, described spring element can be from described barrier filmPull down.
3. membrane pump according to claim 1 and 2, is characterized in that, is provided with hydraulic pressure body and diaphragm body, instituteState barrier film and be clamped between described hydraulic pressure body and described diaphragm body, so that described hydraulic cavities is arranged on described hydraulic pressureIn body, and described pumping chamber is arranged in described diaphragm body, and wherein, described hydraulic pressure body comprises along described springThe closable opening that the direction of the first pre set force of element arranges, by described opening, spring element can be changedOr regulate.
4. membrane pump according to claim 1 and 2, is characterized in that, the hydraulic fluid of pulsing passes through passageBe supplied to described hydraulic cavities, the wherein said passage at least region in it leads to described hydraulic cavities is oriented instituteState passage and form an angle [alpha] with respect to the direction of the first pre set force of described spring element, described angle [alpha] >0°。
5. membrane pump according to claim 4, is characterized in that, described angle [alpha] > 45 °.
6. membrane pump according to claim 4, is characterized in that, described angle [alpha] > 70 °.
7. membrane pump according to claim 4, is characterized in that, described angle [alpha] > 90 °.
8. membrane pump according to claim 1 and 2, is characterized in that, described hydraulic cavities is mended by leakageRepay valve and be connected to hydraulic fluid reservoir, described leakage compensation valve comprises closure body, described in close physical efficiency at valveReciprocally motion between the closed position that door is closed and the open position of valve open, this closure body utilizes pressureElement remains on described closed position, if described pressure elements be designed to pressure in described hydraulic cavities lower thanSetting pressure pL, described closure body moves along the direction of described open position.
9. membrane pump according to claim 8, is characterized in that, the described pressure of described leakage compensation valveWhenever the described spring element of element and described barrier film is constructed and is arranged in, the pressure in described hydraulic cavitiesPower pHWith the pressure p that is applied to hydraulic fluid by described spring elementFVSum is than described setting pressure pLHigh.
10. membrane pump according to claim 9, is characterized in that, the Quality Design of described closure body becomes to work asWhile making pressure in hydraulic cavities drop to 0 bar to continue to be no more than 1ms due to the pulse of described hydraulic cavities internal pressure, instituteStating closure body moves and is no more than 0.2mm along the direction of described open position.
11. membrane pumps according to claim 10, is characterized in that, described closure body is opened described in edgeThe direction motion of position is no more than 0.1mm.
12. 1 kinds regulate the method for membrane pump, and described membrane pump comprises pumping chamber;
Compression fittings and suction attachment,
Wherein, described compression fittings and suction attachment are connected to described pumping chamber;
Hydraulic cavities,
Wherein, described pumping chamber and described hydraulic cavities are separate by barrier film,
Wherein, pulsation working liquid pressure is applied to the described hydraulic cavities that is filled with hydraulic fluid,
Thus, described barrier film moves between primary importance and the second place, in described primary importance, described inPumping chamber has less volume, and in the described second place, described pumping chamber has larger volume, wherein,Described hydraulic cavities is connected to hydraulic fluid reservoir by leakage compensation valve;
Wherein, described barrier film comprises the spring element with the first spring constant, and described spring element is designed toDescribed spring element applies the first pre set force along the direction of the described second place to described barrier film; It is characterized in that:
Described spring constant is chosen to for the pressure that is applied to hydraulic fluid by described barrier film by spring elementPower pFVBe held in: pFV>pA-pSO, wherein pAAtmospheric pressure, pSOQuiet at described suction attachment placePress.
13. methods according to claim 12, is characterized in that: by described spring element be chosen to forBe applied to the pressure p of described hydraulic fluid by described spring elementFVBe held in: pA>pFV>pA-pSO, whereinpAIt is atmospheric pressure.
14. methods according to claim 13, is characterized in that, pass through check-valves at described suction attachmentBe connected in the situation in described pumping chamber and adopt membrane pump, described check valve design becomes described check-valves describedBetween pressure in the pressure at suction attachment place and described pumping chamber, there is pressure differential deltap pSVIn time, opens, described in wherein inciting somebody to actionSpring element is chosen to for the pressure p that is applied to described hydraulic fluid by described spring elementFVBe held in:
pA>pFV>pA-pSO+ΔpSV。
CN201180040470.5A 2010-08-26 2011-08-15 Membrane pump and control method thereof Active CN103210216B (en)

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DE102010039831.4A DE102010039831B4 (en) 2010-08-26 2010-08-26 Diaphragm pump and method for adjusting such
DE102010039831.4 2010-08-26
PCT/EP2011/064044 WO2012025422A2 (en) 2010-08-26 2011-08-15 Membrane pump and method for adjusting same

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ITUB20151971A1 (en) * 2015-07-06 2017-01-06 Seko Spa MEMBRANE PUMP
DE102021106765A1 (en) 2021-03-19 2022-09-22 Prominent Gmbh Diaphragm pump for conveying a fluid
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DE102010039831B4 (en) 2022-02-03
EP2609331A2 (en) 2013-07-03
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CA2808373A1 (en) 2012-03-01
WO2012025422A2 (en) 2012-03-01
DE102010039831A1 (en) 2012-03-01
CN103210216A (en) 2013-07-17
JP2013536363A (en) 2013-09-19
US20140147292A1 (en) 2014-05-29
US20150004005A9 (en) 2015-01-01
CA2808373C (en) 2018-03-06
RU2013113175A (en) 2014-10-10
KR20130137151A (en) 2013-12-16

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