EP2791511B1 - Pompe à vide à anneau liquide pourvue d'un réglage de cavitation - Google Patents

Pompe à vide à anneau liquide pourvue d'un réglage de cavitation Download PDF

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Publication number
EP2791511B1
EP2791511B1 EP12799568.6A EP12799568A EP2791511B1 EP 2791511 B1 EP2791511 B1 EP 2791511B1 EP 12799568 A EP12799568 A EP 12799568A EP 2791511 B1 EP2791511 B1 EP 2791511B1
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EP
European Patent Office
Prior art keywords
pump
cavitation
rotational speed
predefined
ring vacuum
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
EP12799568.6A
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German (de)
English (en)
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EP2791511A2 (fr
Inventor
Heiner KÖSTERS
Matthias Tamm
Daniel SCHÜTZE
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Sterling Industry Consult GmbH
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Sterling Industry Consult GmbH
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Priority to EP12799568.6A priority Critical patent/EP2791511B1/fr
Publication of EP2791511A2 publication Critical patent/EP2791511A2/fr
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Publication of EP2791511B1 publication Critical patent/EP2791511B1/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C19/00—Rotary-piston pumps with fluid ring or the like, specially adapted for elastic fluids
    • F04C19/004—Details concerning the operating liquid, e.g. nature, separation, cooling, cleaning, control of the supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C19/00—Rotary-piston pumps with fluid ring or the like, specially adapted for elastic fluids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C25/00—Adaptations of pumps for special use of pumps for elastic fluids
    • F04C25/02—Adaptations of pumps for special use of pumps for elastic fluids for producing high vacuum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/08—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by varying the rotational speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/28—Safety arrangements; Monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2220/00—Application
    • F04C2220/10—Vacuum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/80—Other components
    • F04C2240/81—Sensor, e.g. electronic sensor for control or monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/05—Speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/12—Vibration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/12—Vibration
    • F04C2270/125—Controlled or regulated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/44—Conditions at the outlet of a pump or machine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/86—Detection

Definitions

  • the invention relates to a method for operating a liquid ring vacuum pump.
  • vibration measurement values of the pump are recorded and compared with a predetermined cavitation threshold value.
  • the invention also relates to a liquid ring vacuum pump suitable for carrying out the method.
  • Liquid-ring vacuum pumps pose the problem that cavitation can occur in different operating states. Operating the pump under cavitation conditions for an extended period of time exposes the components of the pump to high mechanical stress, which can quickly destroy the pump. Previous liquid ring vacuum pumps are therefore designed so that always a sufficient distance is maintained to the operating conditions in which cavitation may occur. Although the pump is thus protected against damage due to cavitation, the distance to the cavitation limit does not exploit part of the potential performance of the pump.
  • Liquid ring vacuum pumps with control devices for stepless adjustment of the rotational speed as a function of pressure and temperature are known US 4,655,688 A , which is considered to be the closest prior art, and can prevent cavitation.
  • the invention is based on the object to present a pump and a method for operating a pump, in which the efficiency is increased.
  • a measured value is recorded which represents the liquid content in the gas to be delivered, and the measured value is compared with a predetermined limit value.
  • the speed of the pump is reduced if the specified cavitation threshold is exceeded and the liquid content is below the specified limit.
  • the speed of the pump is increased if the specified cavitation threshold is exceeded and the liquid content is above the specified limit.
  • the liquid that forms the liquid ring of the pump is called the working fluid.
  • condensate is not limited to liquids that have been formed by condensation, but also includes other liquids that are carried by the gas. In particular, it is not necessary that the condensate is a different substance than the operating fluid. If the condensate enters the pump, it can mix with the operating fluid. It is therefore not inevitably challenged the same fluid from the pump, which has occurred as condensate.
  • liquid content refers to liquid / condensate entrained by the gas to be delivered.
  • the cavitation threshold is selected so that it can be concluded from vibration readings above the cavitation threshold that cavitation occurs in the pump, while there is no cavitation in the pump for vibration readings below the cavitation threshold.
  • the concrete value of the cavitation threshold value depends on the design of the pump as well as the type of sensor and the absorption of the Measured values. For each individual pump, the cavitation threshold can be easily determined by experiment.
  • the limit value for the liquid content is also dependent on the specific shape of the pump. In one pump, even very small amounts of condensate trigger cavitation. With the other pump, a certain amount of condensate can be carried without affecting the operation of the pump. This, too, can easily be determined by tests for each pump. It is also conceivable that the limit value changes depending on the rotational speed of the pump, so that the limit value is a function dependent on the rotational speed. The statement that the measured value is compared with a limit value is to be understood by a wide margin. For example, if the liquid content is deduced from indirect measurements, the comparison with the limit value may be that the indirect measurement identifies features that indicate high or low liquid content.
  • the invention has recognized that in liquid ring vacuum pumps unlike other types of pumps (cf. DE 35 20 538 A1 ) is not always possible to bring the pump back out of the cavitation by lowering the speed. In fact, decreasing the speed helps only in certain operating conditions, for example, when the cavitation occurs because the pump is operated at high speed and at low suction pressure. This cavitation is called classical cavitation.
  • this finding is used to introduce a method by which the operation of the pump can be automatically adjusted for different types of cavitation.
  • the method according to the invention in each case two criteria are combined in order to decide whether the rotational speed is increased or decreased. If the cavitation threshold has been exceeded and the liquid content is low, the speed will be reduced. If the cavitation threshold has been exceeded and the liquid content is high, the speed is increased.
  • the process step to increase the speed of the pump after the occurrence of cavitation is exactly opposite to the usual teaching, according to which it was assumed that in cavitation, the speed must always be lowered.
  • readings from external sensors can be processed to determine the liquid content of the gas being pumped. It can be provided in the space to be evacuated a sensor that measures the liquid content directly. It can also be concluded from other measured values, which concern about the pressure or the temperature in the space to be evacuated, on the liquid content.
  • measured values recorded at the pump can be used to determine the liquid content. It is possible, for example, to deduce the liquid content from measured values of a vibration sensor. Although the liquid content can not be measured directly via a vibration sensor. It turns out, however, that the cavitation caused by an excess of condensate causes characteristic oscillations that differ from the oscillations in classical cavitation. By suitable evaluation the measured values of the vibration sensor, these characteristic properties can be determined. For example, a Fourier analysis can be carried out and it can be concluded from the peculiarities of the frequency spectrum whether the cavitation is caused by increased liquid content or not. How the specifics look concretely depends on the design of the pump and the arrangement of the vibration sensor and must be determined in individual cases by tests if necessary.
  • the measured values to be compared with the cavitation threshold value can be recorded with the same vibration sensor or another vibration sensor.
  • the evaluation of whether there is any cavitation is easier than the evaluation of the different types of cavitation.
  • the cavitation threshold may simply relate to the amplitude of the oscillation. If the amplitude exceeds the cavitation threshold, it can be concluded that cavitation is present.
  • Another way of determining the liquid content and thus the type of cavitation from measured values recorded on the pump is to evaluate the internal motor data, such as the motor voltage and the motor current.
  • cavitation can not be eliminated by adjusting the speed alone. In this case it can be provided to admit additional air via a valve in the working space of the pump. Although this reduces the efficiency of the pump, cavitation is reliably eliminated.
  • the operation of the pump can be based on a multi-stage sequence.
  • the pump may be operated at a speed below the minimum speed lies.
  • the minimum speed denotes that speed at which the liquid ring in the pump is just stable.
  • the pump is therefore operated without a stable liquid ring.
  • the pump which is actually designed for conveying gas, can be used to initially convey an amount of liquid out of the space to be evacuated.
  • the blades of the impeller then act as blades, with which the liquid is passed through the pump. A separate condensate pump is thereby superfluous.
  • the liquid ring vacuum pump can be operated at a second stage of the process initially at maximum speed to bring out in the shortest possible time as much gas from the space to be evacuated.
  • This operating state there is the risk that with decreasing pressure, classical cavitation will occur in the liquid ring.
  • the classic cavitation can be counteracted by reducing the speed.
  • the pump can be operated in this way close to the cavitation limit, the speed is reduced further and further, the lower the pressure.
  • the term cavitation limit designates an operating state the pump, which shows the first signs of cavitation.
  • the speed of the pump can be reduced in a third process stage to a value close to the minimum speed.
  • Low-speed operation saves energy. If cavitation occurs at such a low speed, this is usually due to an increased liquid content in the gas to be delivered. So cavitation occurs, this can be counteracted by increasing the speed.
  • the pump can be used in this way, for example, when disinfecting in hospitals.
  • the object to be disinfected is placed in a chamber and treated with hot steam.
  • the chamber can be evacuated by the method according to the invention. It can first be transported away at low speed, the condensate. By then operating the pump at maximum speed and then lowering the speed along the cavitation limit, time is saved in the actual evacuation. By finally maintaining low pressure through low speed operation, energy is saved.
  • the invention also relates to a liquid ring vacuum pump which can be operated according to the method of the invention.
  • the pump includes a pump housing, an impeller mounted eccentrically in the pump housing, and a vibration sensor for absorbing vibrations of the pump.
  • a logic module is provided which compares a measured value of the vibration sensor with a predetermined cavitation threshold value and which compares a measured value representing the liquid content of the gas to be conveyed with a first limit value.
  • a control unit of the pump is designed to adjust the speed of the pump. In this case, the control unit is to designed to reduce the speed when the predetermined Kavitationsschwellwert was exceeded and the liquid content is below a predetermined limit. In this case, the control unit is designed to increase the speed when the predetermined Kavitationsschwellwert has been exceeded and the liquid content is above a predetermined limit.
  • the predetermined cavitation threshold value is chosen so that it is not exceeded during normal operation of the pump, but only when the pump approaches the cavitation limit.
  • the predetermined cavitation threshold value is suitably selected for the respective pump.
  • the cavitation threshold may, for example, refer to the amplitude of the oscillations. It is also possible that the threshold value refers to certain characteristic properties of the vibrations that are triggered by cavitation. For example, it may be that with cavitation vibrations in certain frequencies occur with particular intensity.
  • the distance to the cavitation boundary can also be increased by increasing the pressure in the interior of the pump.
  • the pump may for this purpose have a channel which extends from the outside through the pump housing into the interior of the pump.
  • the channel is provided with a valve which is normally closed. The valve can be opened briefly after exceeding the threshold value, to release gas from the environment into the interior of the pump. This again establishes a distance to the cavitation boundary.
  • the vibration sensor is preferably connected to the pump housing so that it detects vibrations occurring in the pump housing.
  • the vibration sensor can be arranged where the vibrations caused by cavitation occur, ie in the vicinity of the impeller.
  • the vibration sensor can be arranged, for example, on the circumference or on the front side of this region of the housing.
  • the vibration sensor is arranged in a region of the pump housing in which electronic components are present in any case. This can be, for example, the area in which the control unit for the drive is arranged. This is particularly useful when the pump is designed in block design. Block design means that the pump and the drive are surrounded by a common pump housing. The vibrations generated in the area of the impeller propagate through the pump housing and can also be measured well elsewhere. If the control unit for driving the pump is connected to the pump housing, the vibration sensor may be integrated in the control unit.
  • the pump can be developed with further features which are described above with reference to the method according to the invention.
  • an impeller 14 is mounted eccentrically in a pump housing 20. Liquid in the interior of the pump is carried by the impeller 14 in rotation and forms a liquid ring extending radially inwardly from the outer wall of the pump housing 20. Due to the eccentric bearing the wings of the impeller 14 protrude different depths depending on the angular position in the liquid ring. The volume of a chamber enclosed between two flights changes as a result. The liquid ring thus acts as a piston which moves up and down in the chamber during one revolution of the impeller 14.
  • a channel leads into the interior of the pump, in which the impeller 14 rotates.
  • the channel 16 opens in the area in which the wings of the impeller 14 emerge from the liquid ring, in which thus the enclosed between two wings chamber increases.
  • gas is sucked through the inlet opening 16 into the chamber.
  • the liquid ring penetrates the further rotation of the impeller 14 back into the chamber. If the gas is sufficiently compressed by the further penetrating liquid ring, it is passed through an outlet opening 17 at atmospheric pressure delivered again.
  • Such a liquid ring vacuum pump serves to evacuate a space connected to the inlet opening 16 to a pressure of, for example, 50 millibars.
  • the pump is also equipped with a designated as Kavitationsbohrung channel extending from the outside into the interior of the pump.
  • a solenoid valve is arranged, with which the channel can be selectively opened or closed.
  • the impeller 14 is connected via a shaft 18 to a drive motor.
  • the pump is designed in block construction, the drive and the impeller 14 are thus accommodated together in the pump housing 20.
  • a control unit 21 is also arranged, via which the drive supplied electrical energy and the speed of the pump is adjusted.
  • control unit 21 comprises a vibration sensor 22, a logic module 23 and a control module 24.
  • the control unit 21 are also supplied with measured values from an external sensor 27.
  • the vibration sensor 22 is connected to the pump housing 20 to detect vibrations of the pump housing 20.
  • the measured values of the vibration sensor 22 are continuously transmitted to the logic module 23.
  • the logic module 23 compares the measured values with a predetermined cavitation threshold value 26 (see Fig. 4 ). If the cavitation threshold 26 is exceeded, this is interpreted as an indication that cavitation has occurred in the pump. However, exceeding the cavitation threshold does not yet determine whether it is classic cavitation or cavitation due to increased liquid content. For this reason, the logic module is additionally supplied with measured values from the external sensor 27, from which it results what the liquid content of the gas to be delivered is.
  • the external sensor 27 may be a sensor that directly measures the fluid content in the supply line to the pump. It is also possible that the external sensor 27 measures values from which the liquid content can be indirectly deduced. These values may, for example, relate to the temperature, the pressure or the amount of the supplied steam in the space to be evacuated.
  • the information is merged, on the basis of which it can be decided whether the speed must be increased or decreased in order to eliminate the cavitation. If cavitation occurs and the gas to be pumped contains no condensate or only very little condensate, the speed is lowered. If cavitation occurs and the gas to be pumped contains more condensate, the speed is increased. From the logic module 23, a corresponding signal is given to the control module 24, so that the drive of the pump is adjusted accordingly. In both cases, adjusting the speed will cause the pump to exit cavitation again.
  • the solenoid valve 28 can be opened for a short time via the control module 24, so that air from the environment can penetrate into the interior of the pump. Also by the associated pressure increase in the interior of the pump, the distance to the cavitation limit is increased.
  • the logic module 23 does not receive information from an external sensor. Instead, the measured values are evaluated by the vibration sensor 22 in two ways. First, the amplitude of the oscillation compared with the predetermined Kavitationsschwellwert. If the amplitude exceeds the threshold, this indicates cavitation. On the other hand, a Fourier transformation of the measured values is made and the frequency distribution of the vibrations is considered. For this purpose, for example, the third-octave band at 5 kHz and the third-octave band at 10 kHz can be singled out.
  • the classical cavitation manifests itself by a characteristic distribution in the 5 kHz third band, while the cavitation caused by increased liquid content causes a characteristic frequency distribution in the 10 kHz third band.
  • This evaluation of the frequency bands in the context of the invention represents a comparison between a limit value and measured values which represent the liquid content.
  • the pump may be used to operate at a first stage of the process at a speed of, for example, 1000 rpm.
  • the minimum speed from which the liquid ring is stable is about 2000 rpm.
  • the pump is therefore operated well below the minimum speed. In this operating state, the pump can be used to transport an amount of liquid out of the space to be evacuated.
  • the pump can go on in a second stage of the process in the vacuum operation.
  • A represents the speed of the pump in Hz
  • B shows the measurements taken with the vibration sensor 22 on a relative scale between 0 and 10
  • C indicates the pressure in the space to be evacuated in millibars
  • the room to be evacuated has a volume of 400 l.
  • the horizontal axis shows the time in seconds.
  • To the Time t 0 is in the room to be evacuated atmospheric pressure of just over 1000 mbar and the vibration sensor measures no vibration of the pump.
  • the pump is accelerated within a short time to the maximum speed of about 5400 rpm.
  • the pressure in the room quickly drops to values of about 500 mbar.
  • the vibrations measured with the vibration sensor 22 exceed for the first time the in Fig. 5B Dashed shown Kavitationsschwellwert 26.
  • the speed of the pump is then slightly reduced, which causes the vibrations within a short time again falls below the predetermined Kavitationsschwellwert 26.
  • the speed is then increased again slightly until the cavitation limit is reached again.
  • the container which has a volume of 400 l, evacuated within 80 s to a pressure of 60 mbar. If you operate the same pump with constant speed, the same process takes 113 s.
  • the speed is therefore reduced so that it is just above the minimum speed. If it comes to cavitation in this state, this is usually due to an increased liquid content in the gas to be delivered.
  • the logic module 23 on the one hand, an excess of the cavitation threshold and, on the other hand, a high liquid content are determined. The logic module 23 will thus convey the instruction to the control unit 24 to increase the speed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Claims (15)

  1. Procédé pour faire fonctionner une pompe à vide à anneau liquide, avec les étapes suivantes :
    a. enregistrement de valeurs de mesure de vibrations de la pompe et comparaison des valeurs de mesure de vibrations avec une valeur de seuil de cavitation (26) prédéfinie ;
    b. enregistrement d'une valeur de mesure qui représente la teneur en liquide dans le gaz à transporter, et comparaison de la valeur de mesure avec une valeur limite prédéfinie ;
    c. adaptation de la vitesse de rotation de la pompe à vide à anneau liquide,
    i. la vitesse de rotation étant réduite quand la valeur de seuil de cavitation (26) prédéfinie a été dépassée et quand la teneur en liquide est inférieure à la valeur limite prédéfinie ;
    ii. la vitesse de rotation étant augmentée quand la valeur de seuil de cavitation a été dépassée et quand la teneur en liquide est supérieure à la valeur limite prédéfinie.
  2. Procédé selon la revendication 1, caractérisé en ce que, dans l'étape b., des valeurs de mesure sont traitées par un capteur (27) externe.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que, dans l'étape b., des valeurs de mesure enregistrées sur la pompe sont traitées.
  4. Procédé selon la revendication 3, caractérisé en ce que, dans l'étape b., des valeurs de mesure de vibrations enregistrées sont traitées.
  5. Procédé selon la revendication 4, caractérisé en ce que, dans l'étape b., le spectre de fréquences des valeurs de mesure de vibrations est pris en considération.
  6. Procédé selon l'une des revendications 1 à 5, caractérisé en ce que la valeur de seuil de cavitation (26) se rapporte à l'amplitude de la vibration.
  7. Procédé selon l'une des revendications 1 à 6, caractérisé en ce que de l'air est introduit dans l'espace de travail de la pompe si la cavitation ne peut pas être éliminée par l'adaptation de la vitesse de rotation.
  8. Procédé selon l'une des revendications 1 à 7, caractérisé en ce que la pompe est mise en fonctionnement dans une première étape du procédé avec une vitesse de rotation inférieure à la vitesse de rotation minimale.
  9. Procédé selon la revendication 8, caractérisé en ce que la pompe est d'abord mise en fonctionnement à une vitesse de rotation maximale dans une deuxième étape du procédé et en ce que la vitesse de rotation est abaissée après l'apparition de la cavitation.
  10. Procédé selon la revendication 8 ou 9, caractérisé en ce que la pompe est mise en fonctionnement dans une troisième étape du procédé avec une vitesse de rotation tout juste supérieure à la vitesse de rotation minimale.
  11. Pompe à vide à anneau liquide avec un carter de pompe (20), avec une roue hélice (14) supportée de façon excentrique dans le carter de pompe (20) et avec un capteur de vibrations (22) pour l'enregistrement de vibrations de la pompe, caractérisée en ce que la pompe comprend un module logique (23) qui compare une valeur de mesure du capteur de vibrations (22) avec un valeur de seuil de cavitation (26) prédéfinie, et qui compare une valeur de mesure représentant la teneur en liquide du gaz à transporter avec une première valeur limite, une unité de commande destinée à l'adaptation de la vitesse de rotation de la pompe étant également prévue,
    i. l'unité de commande étant conçue pour réduire la vitesse de rotation quand la valeur de seuil de cavitation prédéfinie a été dépassée et quand la teneur en liquide est inférieure à une valeur limite prédéfinie ;
    ii. l'unité de commande étant conçue pour augmenter la vitesse de rotation quand la valeur de seuil de cavitation prédéfinie a été dépassée et quand la teneur en liquide est supérieure à une valeur limite prédéfinie.
  12. Pompe à vide à anneau liquide selon la revendication 11, caractérisée en ce que le carter de pompe (20) présente un canal qui s'étend à partir de l'extérieur en direction de l'espace intérieur de la pompe, et en ce que le canal est muni d'une soupape (28).
  13. Pompe à vide à anneau liquide selon la revendication 11 ou 12, caractérisée en ce que, après le dépassement de la valeur de seuil de cavitation (26) prédéfinie, la soupape (28) est ouverte.
  14. Pompe à vide à anneau liquide selon l'une des revendications 11 à 13, caractérisée en ce que la pompe est réalisée de façon monobloc.
  15. Pompe à vide à anneau liquide selon l'une des revendications 11 à 14, caractérisée en ce que le capteur de vibrations (22) est intégré dans l'unité de commande (21).
EP12799568.6A 2011-12-12 2012-12-12 Pompe à vide à anneau liquide pourvue d'un réglage de cavitation Active EP2791511B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12799568.6A EP2791511B1 (fr) 2011-12-12 2012-12-12 Pompe à vide à anneau liquide pourvue d'un réglage de cavitation

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP11193012 2011-12-12
PCT/EP2012/075254 WO2013087708A2 (fr) 2011-12-12 2012-12-12 Pompe à vide à anneau liquide pourvue d'un réglage de cavitation
EP12799568.6A EP2791511B1 (fr) 2011-12-12 2012-12-12 Pompe à vide à anneau liquide pourvue d'un réglage de cavitation

Publications (2)

Publication Number Publication Date
EP2791511A2 EP2791511A2 (fr) 2014-10-22
EP2791511B1 true EP2791511B1 (fr) 2016-09-14

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EP12799568.6A Active EP2791511B1 (fr) 2011-12-12 2012-12-12 Pompe à vide à anneau liquide pourvue d'un réglage de cavitation

Country Status (7)

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US (1) US9169838B2 (fr)
EP (1) EP2791511B1 (fr)
JP (1) JP5657846B1 (fr)
CN (1) CN104066994B (fr)
BR (1) BR112014014150B1 (fr)
MX (1) MX348628B (fr)
WO (1) WO2013087708A2 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016056738A (ja) * 2014-09-10 2016-04-21 有限会社K&G 真空ポンプシステム及びそれを用いた湿式真空スプリンクラーシステム
CN104504970B (zh) * 2015-01-06 2017-03-22 北京理工大学 一种基于压力控制的小型空化实验装置
US10711802B2 (en) 2016-05-16 2020-07-14 Weir Minerals Australia Ltd. Pump monitoring
JP7000800B2 (ja) * 2017-10-31 2022-01-19 横河電機株式会社 検知装置、検知方法、およびプログラム
DK3514389T3 (da) 2017-12-28 2020-10-19 Ebara Corp Pumpeapparat, testdriftsfremgangsmåde af pumpeapparat, motoranordning og fremgangsmåde til at identificere anormal vibration af motoranordning
KR20210079330A (ko) * 2018-10-25 2021-06-29 에드워즈 테크놀로지스 배큠 엔지니어링 (칭다오) 컴퍼니 리미티드 액체 링 펌프의 제어
DE102019105692A1 (de) 2019-03-06 2020-09-10 Ebm-Papst Mulfingen Gmbh & Co. Kg Vorrichtung zur kontinuierlichen Schwingungsüberwachung

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4257747A (en) * 1978-12-15 1981-03-24 The Nash Engineering Company Monitoring machinery by detecting vibrations
DE3420144A1 (de) * 1984-05-30 1985-12-05 Loewe Pumpenfabrik GmbH, 2120 Lüneburg Regelungs- und steuerungssystem, insbes. fuer wassering-vakuumpumpen
DE3520538A1 (de) * 1985-06-07 1986-12-11 Kraftwerk Union AG, 4330 Mülheim Verfahren und einrichtung zum betrieb einer kreiselpumpe
US4699570A (en) * 1986-03-07 1987-10-13 Itt Industries, Inc Vacuum pump system
US5228840A (en) * 1988-11-14 1993-07-20 Impact Mst Incorporated Positive displacement pumps
EP0437637A1 (fr) * 1989-11-20 1991-07-24 KKW Kulmbacher Klimageräte-Werk GmbH Pompe à anneau liquide
DE9306559U1 (fr) * 1992-06-10 1993-07-01 Siemens Ag, 8000 Muenchen, De
DE4327291C2 (de) * 1993-08-13 1997-07-31 Krauss Maffei Ag Verfahren und Vorrichtung zur Bestimmung von Meßgrößen einer Zentrifuge
EP0943805B1 (fr) 1998-03-19 2004-12-15 NSB Gas Processing AG Procédé et capteur pour la détection de la cavitation ainsi qu'un dispositif comprenant un tel capteur
DE102005043434A1 (de) * 2005-09-13 2007-03-15 Gardner Denver Elmo Technology Gmbh Einrichtung zur Leistungsanpassung einer Flüssigkeitsringpumpe
US8657584B2 (en) * 2010-02-16 2014-02-25 Edwards Limited Apparatus and method for tuning pump speed

Also Published As

Publication number Publication date
JP2015502486A (ja) 2015-01-22
WO2013087708A3 (fr) 2014-03-20
US20140377084A1 (en) 2014-12-25
CN104066994B (zh) 2016-09-21
BR112014014150B1 (pt) 2021-11-30
CN104066994A (zh) 2014-09-24
JP5657846B1 (ja) 2015-01-21
WO2013087708A2 (fr) 2013-06-20
EP2791511A2 (fr) 2014-10-22
MX2014007011A (es) 2015-01-14
BR112014014150A2 (pt) 2017-06-13
MX348628B (es) 2017-06-22
US9169838B2 (en) 2015-10-27

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