EP2368041A1 - Verfahren und vorrichtung zur entgasung des förderraums einer dosierpumpe - Google Patents
Verfahren und vorrichtung zur entgasung des förderraums einer dosierpumpeInfo
- Publication number
- EP2368041A1 EP2368041A1 EP09793469A EP09793469A EP2368041A1 EP 2368041 A1 EP2368041 A1 EP 2368041A1 EP 09793469 A EP09793469 A EP 09793469A EP 09793469 A EP09793469 A EP 09793469A EP 2368041 A1 EP2368041 A1 EP 2368041A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure
- pump
- stroke
- delivery chamber
- gas
- 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.)
- Granted
Links
Classifications
-
- 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
- F04B53/06—Venting
-
- 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
- F04B13/00—Pumps specially modified to deliver fixed or variable measured quantities
-
- 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
- F04B2205/00—Fluid parameters
- F04B2205/50—Presence of foreign matter in the fluid
- F04B2205/503—Presence of foreign matter in the fluid of gas in a liquid flow, e.g. gas bubbles
Definitions
- the invention relates to a method for degassing a delivery chamber of a metering pump and a device for carrying out the same.
- the pressure-side pump valve opens, followed by a transfer of liquid from the metering chamber of the dosing pump into the pressure line, whereby pressure equalization takes place.
- the ratio of the gas volume to liquid volume in the metering chamber of the pump increases, with the result that when starting the metering not directly metering volumes are output. The dosing thus stops.
- the present invention the object of an improved method for degassing a delivery chamber and to provide a corresponding device for carrying out the method.
- a first embodiment of the method for degassing a gas-forming fluid in a pumping chamber of a metering pump refers to a pump having a delivery chamber into which a delivery chamber delimiting displacement body extends, wherein the delivery chamber has two openings, one of which via a Suction valve opens into a suction line and a second via a pressure valve in a pressure line. Since the pressure in the pumping chamber increases continuously during pump downtimes because of the formation of gas from the fluid, the pressure valve opens when a certain value is exceeded, so that undefined quantities of gas and fluid pass into the pressure line.
- a collecting gas bubble pending on the delivery chamber side is advantageously provided by the method according to the invention, so that when the opening pressure of the pressure valve is exceeded, only gas preferably escapes into the pressure line.
- the method comprises carrying out a pulse, wherein the pulse causes gas bubbles, which have formed in the pumping chamber by the gas-forming fluid and adhere to the inner surfaces of the pumping chamber, to be detached from these surfaces.
- a pulse is exerted during the pulsing at least on a part of the conveying space bounding surfaces or walls and / or the fluid located in the delivery chamber.
- the gas bubbles After the gas bubbles have been detached from the inner surfaces, they float in the delivery chamber, can accumulate to form larger gas bubbles, which then preferably rise in the direction of the pressure valve, preferably a collecting gas bubble on the delivery chamber side to build. Increases now the pressure in winningr ⁇ um, escapes preferably pending on the pressure valve collecting gas bubble from the pumping chamber into the pressure line in the form of outlet gas bubbles.
- This increase in pressure can be a consequence of the fact that even more gas is formed from the fluid during continuous pump shutdown, alternatively, a partial pressure stroke of the displacement body can be performed to increase the pressure, so that the collecting gas bubble escapes into the pressure line.
- no or only small amounts of fluid are discharged into the pressure line.
- the pulse formation for releasing the gas bubbles is effected by generating vibration oscillations by means of a vibration generator which is arranged in the delivery chamber. It is possible to put the displacement body and / or other parts of the delivery chamber in vibration. Alternatively, at least a partial pressure and / or Operaaughub the displacement body can be carried out as a pulse, the z. B. advantageous only such a small, possibly infinitesimal volume sucks that z. B. a Clausaughub can be considered rather than suction pulse. As a result, the gas bubbles adhering to the inner surfaces of the delivery chamber are released and can accumulate with further gas bubbles present in the delivery chamber.
- Yet another embodiment of the method includes performing a partial lift sequence.
- This Sectionhub may be a Generalhub vinyl of suction strokes and / or pressure strokes.
- successive partial pressure strokes can be performed alternately with partial strokes.
- the stroke length with which the displacement body is moved into the delivery chamber can increase, so that each subsequent partial pressure and partial intake stroke combination has a greater stroke length has as the previously executed.
- the collecting gas bubble which is present at the pressure valve, transferred to the pressure line, and still adhering to the inner surfaces of gas bubbles in response to the increasing stroke length, which in turn again form a collecting gas bubble, which is transferred to the subsequent partial pressure stroke back into the pressure line
- the gas bubbles produced in the suction line can also be transferred into the delivery chamber as a result of the increase in the stroke length in a suction stroke, where they then accumulate to the collecting gas bubble and transferred by means of a next pressure stroke in the pressure line.
- the delivery chamber of the metering pump can be almost completely degassed, so that only liquid is advantageously transferred into the pressure line during a first full stroke, which represents a metering stroke, so that controlled metering takes place ,
- the number of partial strokes can be predetermined, so that the Generalhub Nobel is previously determined with the growing stroke lengths.
- the partial stroke sequence can be defined with increasing stroke lengths via a desired degassing degree, which can be determined by detecting a pressure gradient in the delivery chamber when a pressure or suction stroke is executed. This determined pressure gradient is compared with a pressure gradient value, which was determined for a degassed delivery chamber as Kalibrierdruckgradient.
- the desired degree of degassing of a pressure gradient corresponding to the calibration pressure gradient minus a tolerance of z. B. 5% of Kalibrierbuchste whyswerts.
- a sectionaughub according to the foregoing description preferably has a proportion of 0.1% to 99%, preferably from 1% to 50%, most preferably from 1% to 25% of a full suction stroke.
- a partial pressure stroke according to the foregoing description preferably has a proportion of 0.1% to 99%, preferably 1% to 50%, most preferably 1% to 25% of a full pressure stroke of the metering pump.
- the pressure stroke is preferably carried out in a known manner by movement of the displacement body, for example a piston or a membrane.
- inventions of the method relate to the fact that, for example, in known pump downtime, time intervals or times by means of a timing device, which is in operative connection with the pump, can be preset, so that an automatic degassing is performed before the pump back in Operation is taken.
- the pulse for degassing the pumping chamber is preferably carried out during a service life or during a pump stop.
- the execution of a sectionhub shadow with increasing stroke lengths is preferably carried out for starting the pump after a service life of the pump.
- a pressure sensor arranged on the delivery chamber, which receives the pressure in the delivery chamber, record the pressure profile over a stroke. If the pressure profile determined over the duration of a stroke is related to the stroke or to a volume bounded in the delivery chamber by the traveled stroke length of the displacement body, and if appropriate as p / V ratio. Plotted diagram, it shows a curve for the pressure curve in a pressure stroke, from which the pressure gradient behavior can be seen. When the pump is in a vented state, the slope of the near-linear pressure rise or pressure drop reaches a maximum value, which is taken as the set value of the pressure ramping behavior.
- the pressure diagram shows an increase or decrease with a smaller gradient, which corresponds to an actual value of the pressure gradient, when a pressure or suction stroke is carried out.
- the process for pump venting can be carried out until the best possible venting of the pumping chamber has been achieved.
- Such a comparison is carried out in an evaluation device and the determined result is provided in a control device for actuating the pump as a control parameter. This can be targeted depending on the resulting gas volume, a degassing be initiated or the length of the degassing or the efficiency of the degassing can be determined.
- the comparison results are preferably supplied to a control device for actuating the pump as control parameters for starting the pump during a service life of the pump, during a pump stop, after a pump stop or for starting the pump after a service life of the pump.
- the actually delivered volume flow into the pressure line during a stroke of the displacement body depends on the size of the total gas volume.
- the actual, ie the actual delivery behavior of the pump is determined and can be compared with a desired delivery behavior of the pump, so that, taking into account certain tolerance limits can be judged whether the pump for the metering operation is still functional.
- the invention further relates to a metering pump for metering fluids, which is suitable, a method according to the preceding Perform description to degas the delivery chamber of the metering pump.
- the delivery chamber of the pump is preferably in fluid communication with at least one suction line which can be revealed via a suction valve and at least one pressure line which can be disclosed via a pressure valve.
- a displacement body for displacing the fluid in the delivery space is preferably provided in a known manner, or the delivery space is delimited on at least one side by this displacement body, for example a piston or a membrane.
- a device for carrying out a pulsation is arranged in the delivery chamber.
- This may be a vibration exciter, which, for example, is in communication with the displacement body or a wall of the delivery chamber in order to exert vibrations or impulses on the fluid in the delivery space.
- the drive of the displacement body itself can serve as a device for carrying out an impulse.
- the drive and / or its control or regulation are preferably designed so that the drive can control the displacement body so that it can perform small suction and / or pressure strokes, which exert only a pulse on the fluid in the delivery chamber, which is required To dissolve and accumulate gas bubbles in the pump room.
- the stroke is preferably so small that substantially no fluid is conveyed.
- the drive of the displacement body is then configured such that it can express a collecting gas bubble, as described above, from the pumping space.
- Such a drive of the displacement body can be done mechanically, hydraulically, pneumatically and / or magnetically.
- a stepper motor can drive the displacement body via a corresponding transmission.
- An embodiment of the pump according to the invention refers to the fact that the displacement body, which displaces the fluid from the pumping chamber, is actuated via a travel-controlled drive device, in particular a step motor or a linear motor, for sure to make that the required Ambiaughübe or partial pressure strokes are correspondingly small suction or Druckhübe and thus can produce a correspondingly small negative or positive pressure.
- a travel-controlled drive device in particular a step motor or a linear motor
- the displacement body which may be a diaphragm or a piston, optionally executes stroke distances of tenths of millimeters.
- the finest pressure pulses are possible, which allow the detachment of the gas bubbles, which adhere to the inner surfaces of the pumping chamber, as well as to a membrane or to a pointing in the delivery chamber surface of the displacement piston.
- the membrane performs a vibrating motion, which corresponds to a "ventricular fibrillation", ie there is no or a very small pumping action for the fluid, the gas bubbles, however, are set in motion, detach themselves from the walls and unite to larger Gas bubbles, which then experience a buoyant force in the fluid and ascend.
- Fig. 1.1 to 1.8 show representations of the time sequence of the degassing processes and conditions in the delivery chamber of the diaphragm pump in the event of an interruption in operation
- FIGS. 2.1 to 2.10 show illustrations of the chronological sequence of the degasification processes and states in the delivery chamber of the membrane pump in the method for bringing about a ready state of the metering pump after an interruption in operation
- FIGS. 2.1 to 2.10 show illustrations of the chronological sequence of the degasification processes and states in the delivery chamber of the membrane pump in the method for bringing about a ready state of the metering pump after an interruption in operation
- Fig. 3 shows a flow chart of the method and operations during a stoppage and to bring about a Ready state of the dosing pump.
- a linear motor is understood to be an electric drive machine which does not place the objects connected to it in a rotating, but in a translatory movement. If a linear motor is coupled to actuate a piston in a displacement pump, the piston can travel a very short distance. This makes it possible to meter the piston stroke very finely. The same applies to a stepper motor whose rotor moves forward with only a tiny angular offset for each step specified from the outside. This allows the highest physical positioning accuracy and thus the finest Dosierhübe achieve if such a stepper motor z. B. is coupled via an eccentric with a connecting rod or a plunger pel.
- a pumping room or dosing the space in the metering pump which contains the fluid to be pumped; a displacement device is guided into it for the purpose of fluid displacement.
- Under gas-forming fluids are understood in particular liquid chemicals that tend to get into balance with their decay products and therefore split off gaseous products.
- An example of this is hydrogen peroxide.
- the gases formed increase the pressure in the delivery chamber, thereby causing a delivery chamber of a metering pump, which is closed by pressure valves against suction and discharge line, is pressurized by the formation of the gases. As soon as the through the pressure generated by the resulting gases exceeds the holding pressure of the pressure valves, opens the pressure valve and gases and fluid can pass into the pressure line.
- Teilaughubs or "partial pressure stroke” means a proportion of a full intake stroke / pressure stroke, wherein a full stroke is achieved when the displacement device is operated over the entire stroke length.
- a displacement piston under 100 percent load displace a volume of 100 ml
- a sectionaughub which has only a proportion of 0.1%, displace only 0.1 ml volume.
- a sectionaughub may be so low that even a swinging of the piston, or in a membrane pump of the membrane, preferably in the range of 1 to 20 Hz, for example, 2 to 10 Hz, more preferably from 3 to 4 Hz, is carried out essentially no fluid is conveyed.
- stroke length is equivalently used here to the terms partial stroke or partial pressure stroke, because the proportion of a partial stroke length with respect to an entire stroke length corresponds to the proportion of a partial stroke volume with respect to the total stroke volume , so that, for example, at a partial stroke, which corresponds to a share of 25% of a full stroke, at the same time the Generalhubin corresponds to 25% of the total stroke length.
- a term "desired degree of degassing” is used below, which means that, depending on the fluid to be metered, an experimentally determined minimum degassing can be achieved Gases will also permanently emit gases during the metering process, so that an ideal degree of degassing of such a chemical will correspond to another ideal degree of degassing than is present with a fluid which liberates gases only very gradually and in which a degree of degassing is actually close 1 can be achieved where a degree of degassing close to 1 can actually be achieved.
- the inventive method refers to the fact that the execution of a pulse during a standstill or after a pump stop can be done, whereas the execution of a Generalhub blur with increasing stroke lengths of the displacement body for startup, or to start the pump after a period of Pump can be used.
- a service life of the pump is understood below to mean a time duration which is sufficient to provide a corresponding gas volume. Basically, a service life will be at least 30 minutes, as a service life is also a non-operation of the pump overnight of over 12 hours or even a multi-day non-operating the pump stored in the pump fluid storage.
- a pump stop can take anywhere from a few seconds to 30 minutes.
- the pump For the pump to carry out the degassing method according to the invention during a service life or a pump stop, the pump must be "active", ie it must be supplied with power and a degassing mode, ie a corresponding program present in the pump software, must be activated.
- the gas-forming fluid-promoting metering pump whose delivery chamber is to be freed from the gas formed has a suction opening into the pumping chamber suction valve, which extends into a suction line. Furthermore, the delivery chamber opens via a pressure valve in a pressure line. The same applies if there are several pressure or suction lines.
- a displacement body for displacing the fluid limits the conveyor, usually on one side, and is arranged such that it can alternately execute the pressure strokes required for displacement in combination with the corresponding suction strokes.
- a pulse is first of all carried out, the pulse being imparted by vibration vibrations by means of a vibration generator arranged in or on the delivery chamber or alternatively z.
- B. can be performed as a first Generalaughub the displacement body. This sub-stroke corresponds to a proportion of 0.1 to 99% of a full suction stroke and may also be a swing in a range of 1 to 20 Hz. If the gas bubbles by the vibration oscillations or z. B.
- a section ⁇ ughub may correspond to a proportion of 0.1% to 99%, preferably from 1% to 50%, most preferably from 1% to 25% of a full suction stroke.
- a Operaaughub can also be divided into a plurality of vibration strokes, which make up a total of 0.1 to 10% of a full intake stroke.
- a partial pressure stroke may correspond to a level of from 0.1% to 99%, preferably from 1% to 50%, most preferably from 1% to 25% of a full pressure stroke.
- the determination of the degree of degassing comprises detecting a pressure gradient in the delivery chamber when performing a pressure or suction stroke, and comparing the determined pressure gradient with a pressure gradient serving as Kalibrierdruckgradient, which was determined for a degassed fluid, wherein the desired degree of degassing while a Calibration pressure gradient corresponding to a pressure gradient less a tolerance of approximately 5% of the calibration pressure gradient value.
- the method may further include presetting time intervals and times of a timer operatively connected to the pump, such that actuation of the pump to start, during a service life, after a pump stop or to start the pump after a service life of the pump , time-controlled.
- a timer operatively connected to the pump, such that actuation of the pump to start, during a service life, after a pump stop or to start the pump after a service life of the pump , time-controlled.
- the method also provides that further control parameters for starting the pump during a service life of the pump, after a pump stop or for starting the pump after a service life, are provided: This is the determination of a actually funded volume flow in the pressure line during a defined stroke of the displacement body and the comparison of the stroke defined by this defined delivery behavior of the pump with a delivery behavior of the pump at identical defined stroke, the comparison of the actual delivery behavior and the desired delivery behavior of the pump show whether gas in Conveyor system is present or not. Knowing the misfed volume, the controller may initiate a corresponding degassing operation, which may be the execution of the partial lift sequence with increasing stroke lengths.
- the metering pump of the method according to the invention will be a diaphragm pump.
- It can be used any displacement body, provided he z.
- B can be caused by coupling with a lifting rod, compressed air or other suitable device for performing smallest strokes.
- a path-controlled drive device such as a linear motor or a stepper motor can be in operative connection with the displacement body.
- a coupling via a compressed air generator is possible.
- the sequence of figures 1.1 to 1.8 is based on the following starting situation: During a pump stop or a service life of the pump arise in the delivery chamber 1 different gas bubbles 4,7,8 out of the outgassing fluid out. Above all, the gas bubbles 4, 8 are formed on the inner walls of the delivery chamber and on the piston surface 3 'of the delivery chamber 1 bounding piston 3. By this gas bubble growth, a pressure p 2 in the delivery chamber 1 increases. If the pressure p 2 greater than the pressure in the pressure line p3, then opens the pressure valve 6. By the migration of the fluid or the collecting gas bubble 7 (depending on what is pending on the pressure valve) from the delivery chamber 1 in the pressure line is a pressure compensation instead of.
- Figures 1.1 to 1.8 is the ready holding the pump, which in the present case is a diaphragm pump, although the membrane itself is not shown separately figurative shown.
- the gas bubbles can be caused by the decomposition of unstable fluids such as hydrogen peroxide (H2O2).
- a pulse is carried out as Sectionaughub b and partial pressure stroke a, alternatively, the pulse can also be generated by a swing of the membrane.
- Fig. 1.3 is outlined how by a continued S äughub b of the piston 3, the G ⁇ sbl ⁇ sen 4 ', 7,8' are still larger, accumulate and rise in the direction of the pressure valve 6.
- the suction valve 5 can continue to remain closed.
- Fig. 1.4 shows a large collecting gas bubble 7 after the suction stroke of the piston 3 is completed.
- a subsequent pressure stroke a of the piston 3, shown in FIG. 1.5, causes the pressure p2 in the delivery chamber 1 to rise again, as a result of which the volume trapped in the delivery chamber 1 decreases.
- equation (I) the volume of the gas bubbles 4 'and the collecting gas bubble 7 located in the delivery chamber 1 decreases accordingly.
- a position of the piston 3 is achieved according to that of Fig. 1.1.
- the pressure level p 2 in the delivery chamber 1 also corresponds to the pressure level from FIG. 1.1.
- Fig. 1.7 shows how by further outgassing of the fluid, the volume of the gas bubbles 4,8 and the collecting gas bubble 7 increases and the pressure p ⁇ in the pumping chamber 1 further increases.
- This increase in pressure causes the pressure p 2 in the delivery chamber 1 is higher than in the pressure line (p 2 > P3).
- the pressure valve 6 opens and the collecting gas bubble 7 attached thereto begins to escape as a result of the pressure equalization in the pressure line as exit gas bubbles 7 '.
- the fine suction strokes and strokes can be performed well with a metering pump for metering fluids when the displacer of the device is operated by a step or linear motor and acts on the diaphragm or piston as the displacer, or if Vibration generator is installed for impulse.
- the displacement body which may be a piston or a flexible membrane 3, may be driven mechanically via a lifting rod 2 or hydraulically or pneumatically or magnetically.
- This process of winningraumentraumung can be performed several times during a service life, for example, by a device for timing (not shown) at predetermined time intervals or at predetermined times outputs a signal that sets the process for degassing the pump room in motion.
- a device for timing not shown
- predetermined time intervals or at predetermined times outputs a signal that sets the process for degassing the pump room in motion.
- empirical values can be used, so that the skilled person can set the time intervals in such a way that the conveyor gassing takes place when a correspondingly strong gas bubble is present. education is to be expected.
- a step for determining an actual pressure gradient in the delivery chamber during a pressure or suction stroke and comparing the actual pressure gradient behavior of the pump with a desired pressure gradient of the pump with an evaluation device for evaluating the comparison results are performed, wherein the comparison results of a control device to operate the pump as a control parameter for starting the pump after a service life of the pump, alternatively after a pump stop.
- the steps of setting a time control or a pressure gradient based on the determination of the pressure increase in the delivery chamber in a pressure or suction stroke can be carried out at arbitrary, desired times and also alternately, if necessary, in alternation with manual execution of the method ,
- the determination of the pressure gradient can be carried out with a pressure measurement device present in the delivery chamber, which receives the pressure curve p2 in the delivery chamber via a pressure or suction stroke, with increasing gas bubble formation, the slope of the pressure increase or pressure drop in a recorded pressure Stroke length diagram decreases, since the gas bubbles are compressible, and when falls below a certain threshold and feedback of the data to a control device, the delivery room ventilation is automatically triggered.
- the inventive method further relates to the bringing about a ready state of the pump by the delivery chamber and supply lines such as the suction line with the simplest means as quickly as possible freed of gas bubbles, so that the pump can fulfill their task for accurate dosing, without a variety of inaccurate Dosierh paragraph when resuming the dosing takes place after a break.
- the sequence of figures 2.1 to 2.10 is based on the following information: The pump should start to dose again after a stoppage of operation. In the case of outgassing dosing fluids, a complete pressure stroke must not be carried out immediately, that is, no full stroke volume may be passed through the displacement body.
- second partial pressure stroke a of the piston 3 in Fig. 2.5 wherein the stroke length of the second pressure stroke a is greater than that of the previous pressure stroke in Fig. 2.2, the pressure p2 increases in the delivery chamber 1 again and that in the delivery chamber 1 trapped volume decreases.
- the opening pressure of the pressure valve 6 is reached (p 2 > p3), so that a Crystalhubvolumen 20 of the fluid, but especially at the pressure valve 6 pending collecting gas bubble 7 is transferred to the pressure line.
- the partial stroke volume 20 is at least as great as the stroke difference between the predecessor stroke and the current larger partial stroke.
- Fig. 2.6 shows that after completion of the second partial pressure stroke, a further second Partaughub b is executed.
- the pressure p 2 in the delivery chamber 1 drops, while analogously the volume enclosed in the delivery chamber 1 increases according to equation (I) and thus also the volumes of the gas bubbles 4 '.
- the gas bubbles 4 ' rise in the direction of the pressure valve 6.
- a volume is sucked from the suction line. This may consist partly of fluid volume and partly of gas volume.
- the thus tracked by the suction valve 5 from the suction line G ⁇ sbl ⁇ sen 7 "rise in solicitr ⁇ um 1 in the direction of the pressure valve 6 (arrow e).
- the collecting gas bubble 7 leaves in the form of outlet gas bubbles 7 'the delivery chamber 1 through the pressure valve 6 in the pressure line (shown in Fig. 2.9). Ideally, the delivery chamber 1 is now free from adhering to the inner surfaces of the delivery chamber 1 gas bubbles.
- the pump was thus advantageously degassed with a small number of strokes, without significant amounts of metering fluid would have been pumped into the pressure line and there would be undesirable spent at the first Dosierhub with.
- the partial strokes disclosed in the method according to the invention, the nenf ⁇ lls perform such a small stroke that can be spoken of a vibration, as well as the associated partial pressure strokes are sufficient to degas the pumping chamber and a portion of the suction line.
- the method for degassing the pumping chamber of the pump to achieve a ready state can be triggered manually, but it is also a controlled control possible, so that the inventive method can be initiated when a dosage unit is reported via a control unit, if Time control provides the degassing.
- the parameters determined above can be transmitted in a manner known to the person skilled in the art to a corresponding control and regulating unit operatively connected to the pump in order to initiate the method according to the invention starting with the desired steps.
- FIG. 3 shows in a flow chart a possible chronological or logical sequence of the method according to the invention.
- the processes in the delivery chamber of the pump are described.
- a metering pause of the metering pump wherein gas bubbles have formed in the delivery chamber through the outgassing fluid in the interior of the delivery chamber, which adhere to the inner surfaces of the delivery chamber (corresponds to FIGS. 1.1 and 1.8)
- the pressure p 2 inside the pumping chamber decreases, whereby the volumes of the gas bubbles grow, accumulate the gas bubbles and ascend to the collecting gas bubble (corresponds to Fig. 1.2 and 1.3).
- the second sub-step of the pulse is carried out by performing a partial pressure stroke, whereby the pressure p2 increases in the delivery chamber, whereby a further Ak- Cumulating the G ⁇ sbl ⁇ sen and ascending to S ⁇ mmelg ⁇ sbl ⁇ se is effected (corresponds to Fig. 1.5).
- the gas bubble volumes grow by the continued outgassing of the fluid, whereby the pressure p 2 in the delivery chamber further increases, so that when the opening pressure of the pressure valve when the pressure p2 in the delivery chamber is greater than the pressure p3 in the pressure line, the collecting gas bubble escapes (corresponds to Fig. 1.6 and 1.7). If the dosing pause of the pump now lasts, the execution of the pulse by sub-stroke and partial pressure stroke is continued tmtervaii at a distance of the preset time interval until the dosing pause is completed.
- the partial lifting sequence is now carried out with increasing stroke lengths of the displacement body, the partial lifting sequence consisting of n partial lifting combinations of partial pressure strokes and partial lifting strokes.
- the number n can be preset or controlled depending on the degassing state of the pumping chamber.
- Each partial pressure stroke partial lift combination is designed with a stroke length corresponding to a proportion of X n % of full stroke length, with each subsequent partial pressure stroke partial lift combination having a longer stroke length ( ⁇ n + i> ⁇ n ).
- the pump can deliver an entire stroke volume VH (corresponding to Fig. 2.10).
- the method of Fig. 3 has been described with reference to the figure sequence 2.1-2.10 by executing the Operahub vinyl with increasing stroke lengths with a number of three sub-strokes.
- the number of partial strokes of Operahub vinyl with increasing stroke lengths is not limited and can be adjusted according to the given operations in relation to the pumping chamber and the fluid to be dosed.
- the number of partial strokes in the partial lifting sequence can also be controlled with the aid of a suitable measuring technique, depending on the presence of the gas bubbles in the conveying space.
- This device may be for example an optical sensor or a pressure sensor. If there are no more gas bubbles, the pump is already in an operational state. riding condition; If the apparatus determines whether or not there are still gas bubbles, the sub-stroke sequence is initiated with increasing stroke lengths, whereby partial gas bubbles accumulate out of the delivery chamber and rise to a collecting gas bubble, which is caused by a partial pressure stroke is transferred to the pressure line. This loop is carried out until there are no more gas bubbles, so that the pump is in an operational state and can dose with it.
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Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102008061904A DE102008061904A1 (de) | 2008-12-15 | 2008-12-15 | Verfahren und Vorrichtung zur Entgasung des Förderraums einer Dosierpumpe |
| PCT/EP2009/008876 WO2010072340A1 (de) | 2008-12-15 | 2009-12-11 | Verfahren und vorrichtung zur entgasung des förderraums einer dosierpumpe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2368041A1 true EP2368041A1 (de) | 2011-09-28 |
| EP2368041B1 EP2368041B1 (de) | 2018-11-21 |
Family
ID=41800652
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP09793469.9A Active EP2368041B1 (de) | 2008-12-15 | 2009-12-11 | Dosierpumpe mit vorrichtung zur entgasung des förderraums |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US8540799B2 (de) |
| EP (1) | EP2368041B1 (de) |
| CN (1) | CN102245901B (de) |
| AU (1) | AU2009331947B2 (de) |
| DE (1) | DE102008061904A1 (de) |
| RU (1) | RU2490515C2 (de) |
| WO (1) | WO2010072340A1 (de) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5582479B2 (ja) * | 2009-08-12 | 2014-09-03 | 国立大学法人 名古屋工業大学 | 気泡除去方法および気泡除去装置 |
| DE102012102088A1 (de) * | 2012-03-13 | 2013-09-19 | Prominent Dosiertechnik Gmbh | Verdrängerpumpe mit Zwangsentlüftung |
| KR101539896B1 (ko) | 2014-10-14 | 2015-08-06 | 울산대학교 산학협력단 | 유도전동기 오류 진단 방법 |
| TWI724158B (zh) * | 2016-05-12 | 2021-04-11 | 國立大學法人名古屋工業大學 | 連續氣泡去除方法及連續氣泡去除裝置 |
| CN110980915B (zh) * | 2019-12-23 | 2022-08-02 | 解冰 | 一种纳米氧自由基水在抗癌药物中的应用 |
| DE102021102664A1 (de) | 2021-02-04 | 2022-08-04 | Prominent Gmbh | Dosierpumpe mit temporärer Richtungsumkehr des Verdrängungselementes |
| CN117738918A (zh) * | 2022-09-22 | 2024-03-22 | 格兰富控股公司 | 空气排放 |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1453465A1 (de) * | 1963-03-12 | 1969-02-06 | Huels Chemische Werke Ag | Verfahren zum Foerdern und Entlueften unter vermindertem Druck stehender und/oder beim Ansaugen zum Ausgasen neigender pumpfaehiger fluessiger Medien mittels oszillierender Verdraengerpumpen und Vorrichtung zur Durchfuehrung des Verfahrens |
| BE794443A (fr) * | 1972-01-25 | 1973-07-24 | Ciba Geigy | Procede et dispositif de degazage de fluides |
| DK143719C (da) * | 1979-01-03 | 1982-03-08 | Radiometer As | Fremgangsmaade til udluftning af en vaeskedoserende stempelpumpe og stempelpumpe med et arrangement til brug ved udoevelse affremgangsmaaden |
| DE3546189A1 (de) | 1985-12-27 | 1987-07-02 | Ott Kg Lewa | Verfahren und vorrichtung zur durchflussmessung bei oszillierenden verdraengerpumpen |
| DE3827489C1 (de) | 1988-08-12 | 1989-10-12 | Gruenbeck Wasseraufbereitung Gmbh, 8884 Hoechstaedt, De | |
| DE3837097A1 (de) * | 1988-11-01 | 1990-05-03 | Profor Ab | Verfahren zum entlueften einer befuellungsanlage und vorrichtung zur durchfuehrung eines solchen verfahrens |
| JPH05293306A (ja) * | 1992-04-22 | 1993-11-09 | Purantetsukusu:Kk | 脱泡装置 |
| DE4439962A1 (de) | 1994-11-09 | 1996-05-15 | Lang Apparatebau Gmbh | Dosierpumpe mit Entlüftungseinrichtung |
| JPH10115621A (ja) * | 1996-10-14 | 1998-05-06 | Aloka Co Ltd | 分注装置 |
| DE102005024888A1 (de) * | 2005-05-31 | 2006-12-07 | Linde Ag | Kryoverdichter mit seitlich angeordnetem Druckventil |
| CN200999708Y (zh) * | 2007-01-05 | 2008-01-02 | 顾仁生 | 一种带有泄气阀的电磁水泵 |
| JP2008286587A (ja) * | 2007-05-16 | 2008-11-27 | Olympus Corp | 分注装置及び自動分析装置 |
-
2008
- 2008-12-15 DE DE102008061904A patent/DE102008061904A1/de not_active Withdrawn
-
2009
- 2009-12-11 US US13/139,527 patent/US8540799B2/en active Active
- 2009-12-11 CN CN200980150512.3A patent/CN102245901B/zh active Active
- 2009-12-11 AU AU2009331947A patent/AU2009331947B2/en active Active
- 2009-12-11 RU RU2011129341/06A patent/RU2490515C2/ru active
- 2009-12-11 EP EP09793469.9A patent/EP2368041B1/de active Active
- 2009-12-11 WO PCT/EP2009/008876 patent/WO2010072340A1/de not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| CN102245901B (zh) | 2015-07-08 |
| RU2490515C2 (ru) | 2013-08-20 |
| US8540799B2 (en) | 2013-09-24 |
| EP2368041B1 (de) | 2018-11-21 |
| DE102008061904A1 (de) | 2010-06-17 |
| AU2009331947B2 (en) | 2015-09-17 |
| WO2010072340A1 (de) | 2010-07-01 |
| RU2011129341A (ru) | 2013-01-20 |
| AU2009331947A1 (en) | 2011-07-14 |
| US20110247490A1 (en) | 2011-10-13 |
| CN102245901A (zh) | 2011-11-16 |
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