EP3543537A1 - Groupe pompe ainsi que procédé de surveillance d'alimentation en liquide dans un dispositif d'étanchéité dans un groupe pompe - Google Patents

Groupe pompe ainsi que procédé de surveillance d'alimentation en liquide dans un dispositif d'étanchéité dans un groupe pompe Download PDF

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Publication number
EP3543537A1
EP3543537A1 EP18163562.4A EP18163562A EP3543537A1 EP 3543537 A1 EP3543537 A1 EP 3543537A1 EP 18163562 A EP18163562 A EP 18163562A EP 3543537 A1 EP3543537 A1 EP 3543537A1
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EP
European Patent Office
Prior art keywords
sensor
pump unit
concentration
temperature
evaluation device
Prior art date
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Granted
Application number
EP18163562.4A
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German (de)
English (en)
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EP3543537B1 (fr
Inventor
Gert Friis Eriksen
Jens Kjær Milthers
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Grundfos Holdings AS
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Grundfos Holdings AS
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Application filed by Grundfos Holdings AS filed Critical Grundfos Holdings AS
Priority to EP18163562.4A priority Critical patent/EP3543537B1/fr
Priority to US16/361,525 priority patent/US11143190B2/en
Priority to CN201910227128.4A priority patent/CN110296099B/zh
Publication of EP3543537A1 publication Critical patent/EP3543537A1/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
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/08—Sealings
    • F04D29/10—Shaft sealings
    • F04D29/106—Shaft sealings especially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/16—Pumping installations or systems with storage reservoirs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0077—Safety measures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0088—Testing machines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/08—Sealings
    • F04D29/10—Shaft sealings
    • F04D29/106—Shaft sealings especially adapted for liquid pumps
    • F04D29/108—Shaft sealings especially adapted for liquid pumps the sealing fluid being other than the working liquid or being the working liquid treated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/08—Sealings
    • F04D29/10—Shaft sealings
    • F04D29/12—Shaft sealings using sealing-rings
    • F04D29/126—Shaft sealings using sealing-rings especially adapted for liquid pumps

Definitions

  • the invention relates to a pump unit and a method for monitoring or detecting a change in concentration in a liquid reservoir in a seal assembly in a pump unit.
  • the pump unit according to the invention has an electric drive motor and at least one impeller connected to the drive motor via a shaft.
  • the shaft extends between the drive motor and the impeller through at least one seal arrangement.
  • This seal arrangement has a liquid reservoir.
  • the sealing arrangement preferably has at least two seals, between which the liquid reservoir is designed in the form of a chamber filled with liquid.
  • the liquid reservoir serves to detect leaks and prevent the direct ingress of water into the dry engine compartment.
  • the liquid in the chamber can serve for cooling.
  • the electric drive motor is preferably formed dry running in such a configuration. Ie. the seal assembly is located between the fluid-filled pump chamber in which the impeller rotates and the dry electric drive motor.
  • the pump chamber can in particular be filled with water if the pump unit is designed to convey water, for example fresh water or wastewater.
  • At least one concentration sensor for detecting a change in concentration in the liquid reservoir is formed on the liquid reservoir.
  • the concentration sensor can be designed, for example, to detect the concentration of a second liquid in a first liquid of the liquid feed, in particular the concentration of water in glycol or vice versa.
  • other liquid mixtures can be used, in particular mixtures of more than two liquids.
  • the concentration sensor is configured to detect changes in an initially set concentration of the various liquids in the liquid receiver.
  • the concentration sensor may be designed so that it dips into the liquid or detects the concentration contactlessly from the outside, e.g. through a partition.
  • At least one second sensor for detecting at least one further parameter of the liquid original is additionally arranged on or in the liquid template. Both the concentration sensor and the at least one second sensor are connected to an evaluation device such that the evaluation device can receive and further process the measured values which are detected by the sensors.
  • the evaluation device can be integrated into an electronic control or regulating device arranged directly on the pump unit, in particular a control device for controlling or regulating the drive motor.
  • the evaluation device may be arranged, for example, in an electronics housing of the pump unit.
  • the evaluation device or parts of the evaluation device could also directly into the sensor or a sensor housing of the first and / or second sensor. It is also conceivable to distribute the functionality of the evaluation device to a plurality of electronic units or processors in different components.
  • the evaluation device is designed such that it carries out an evaluation of at least one measured value of the concentration sensor, taking into account at least one measured value detected by the at least one second sensor.
  • the parameter detected by the second sensor may be a parameter that identifies a particular operating condition or indicates changes in operating conditions and / or environmental conditions. This makes it possible to compensate or correct the changes in the measured value of the concentration sensor on the basis of the measured values of the at least one second sensor, so that a more accurate concentration measurement becomes possible.
  • a plurality of second sensors may be provided or a second sensor which detects more than one parameter simultaneously.
  • the second sensor can detect the temperature and / or the pressure or, alternatively or additionally, vibrations and / or structure-borne noise.
  • the at least one second sensor is a temperature sensor or a sensor which detects at least one temperature-dependent parameter.
  • a temperature-dependent parameter may be any parameter which depends on the temperature, in particular is proportional to the temperature. Such a temperature-dependent parameter thus enables indirect temperature detection.
  • the evaluation device is designed such that it performs an evaluation of at least one measured value of the concentration sensor taking into account at least one of the at least one second sensor detected temperature measurement or temperature-dependent parameter.
  • the evaluation device as described above, is designed such that it corrects or compensates the measured value of the concentration sensor on the basis of the temperature measurement value or temperature-dependent parameter, which is detected by the at least second sensor.
  • this correction can be based directly on a detected temperature measurement value or else a parameter which is temperature-dependent, for example a vibration signal.
  • a direct or an indirect temperature-dependent compensation takes place.
  • the concentration sensor is preferably designed as an ultrasonic sensor, as an optical sensor or as a capacitive sensor.
  • an ultrasound generator for example a piezoelectric element
  • a sensor which may also be formed by the sound generator or integrated with it to form a structural unit.
  • the ultrasonic sensor may be a sensor operating according to the reflection principle.
  • a first possible consideration of different operating states in the detection of concentration changes by the concentration sensor can be carried out in such a way that the evaluation device is designed such that it performs an evaluation of a measured value of the concentration sensor only if the measured value detected by the at least one second sensor and in particular a detected by the second sensor temperature reading is below a predetermined maximum limit, preferably a predetermined maximum temperature limit.
  • the concentration measurement may be suspended above a certain operating temperature at which reliable measurement results can no longer be expected.
  • the evaluation device may be configured such that it performs an evaluation of a measured value of the concentration sensor only if the measured value detected by the at least one second sensor and, in particular, a temperature measured value detected by the second sensor are above a predetermined minimum limit value, ie preferably above one predetermined minimum temperature limit is. For example, it can be ensured that the concentration measurement is completely suspended if the temperatures are too low, at which no error-free measurement result is to be expected.
  • the evaluation device is designed such that it outputs an alarm signal on the basis of a measured value detected by the concentration sensor when this at least one measured value or a characteristic value derived from the measured value reaches a predetermined concentration limit value.
  • the evaluation device outputs a switching or control signal which can be detected by a control device and used to switch off the pump set based on this signal, in order to prevent further defects. Based on the alarm signal, it can be determined that replacement of the seals in the seal assembly is required.
  • the evaluation device can be designed such that it can be used e.g. based on the size of the change in concentration and / or the rate of concentration change can detect a break or complete destruction of a shaft seal and outputs an alarm signal upon appropriate detection of a fracture of the shaft seal.
  • the evaluation device is designed such that it forms at least one characteristic value derived from the measured value of the concentration sensor and one measured value acquired by the at least one second sensor, in particular a characteristic value derived from a temperature measurement value.
  • a characteristic value may be a concentration measured value corrected by the influence of temperature, ie a concentration measured value which has been corrected in such a way that a temperature-dependent influence on the measurement result has been eliminated or reduced.
  • the characteristic value can then be decided on the state of the liquid template, in particular the characteristic value can be compared with a predetermined limit value for the concentration and when exceeding or falling below this limit, an error signal can be output, which is a maintenance or repair of Seals signaled.
  • the evaluation device may be designed so that it, for example, at too high and / or too low temperature, which is detected by the second sensor, exposes a measured value detection or measurement value evaluation for the concentration.
  • the evaluation device is also preferably designed such that, upon suspension of a measured value acquisition or measurement value evaluation, it bases the last measured value detected before exposure on further processing. That is, the evaluation device outputs in such a case, for example, the last permissible detected measured value as a concentration value.
  • the evaluation device may be configured such that the measured values of the concentration sensor are recorded at different times and form an average value of the detected measured values as a characteristic value. Averaging can minimize short-term fluctuations due, for example, to changes in the operating state of the pump assembly, and only the long-term effects can be taken into account to account for changes in the liquid reservoir requiring maintenance or repair of the seals.
  • the evaluation device can be designed so that it forms a running average value or an average value over a certain period of time as characteristic value.
  • the specific period of time may be, for example, a certain period of time past the current time.
  • a running average value or at regular intervals a new average value can be formed as the characteristic value for a particular past period. This allows long-term changes in the characteristic value to be recorded while short-term fluctuations due to averaging are eliminated.
  • the evaluation device is designed such that it determines the measured values of the concentration sensor in the formation of the average value as a function of the measured values detected by the at least one second sensor and preferably as a function of the temperature measured values detected by the second sensor and / or Weighted depending on time.
  • concentration measured values in operating states which allow a more accurate measurement of the concentration to be weighted higher in the averaging than measured values in operating states of the pump set, which can be expected to result in inaccurate measurements.
  • the operating states are represented by the measured value detected by the second sensor. In particular, these may be operating states at different temperatures or different temperatures of the liquid feed, which are detected directly or indirectly by the second sensor as described above.
  • concentration readings in temperature ranges that allow for more accurate concentration detection can be weighted higher than concentration readings collected at other temperatures.
  • more recent measurements may be weighted higher than longer measurements.
  • a time recording is also possible in such a way that in the event that, for example, at too high or low temperature, a measured value detection or measurement value evaluation is suspended, the last measured value is used before the suspension.
  • a warning or warning signal can be output that for a long time no correct measurement could be carried out.
  • the evaluation device can be designed such that measured values, ie. H. Concentration readings taken at lower temperature are weighted higher in the formation of the average than readings taken at a higher temperature. This is done, for example, according to a linear function or an inverse sigmoid function. However, other mathematical functions are also applicable to accomplish this. In principle, for example, monotonically decreasing functions can be used at certain temperature intervals, such as the aforementioned linear functions and inverse sigmoid function. However, it is also possible to use monotonically increasing functions in certain temperature ranges, in particular at very low temperatures which are close to the freezing point. Thus, preferably in a higher temperature range a monotonically decreasing function and in a lower temperature range a monotonically increasing function can be used.
  • the higher weighting of the measured values acquired at low temperature is particularly preferred when using an ultrasonic sensor, since at low temperatures the changes in concentration lead to a greater change in the speed of sound through the medium, resulting in a higher accuracy of measurement. At higher temperatures, the speed differences become smaller, so that greater measurement inaccuracies can be given in these areas.
  • the evaluation device may have a neural network for evaluating the at least one measured value.
  • a neural network has the advantage that a learning evaluation is possible, which constantly adapts to changes in the operating conditions and environmental conditions, whereby the evaluation of the measured value of the concentration sensor can be continuously improved and increased in accuracy.
  • the concentration sensor and the at least one second sensor may be integrated into a sensor assembly.
  • the concentration sensor is an ultrasonic sensor and the at least one second sensor is a temperature sensor.
  • an integrated sensor assembly can be created, which as a whole can be easily integrated into a pump unit.
  • At least one third sensor is provided, which is designed to detect an operating state of the pump unit.
  • this at least one third sensor can be designed such that it detects whether the pump unit is in operation or not.
  • the at least one third sensor may, for example, be a vibration or structure-borne noise sensor.
  • the evaluation device is preferably designed so that it performs an evaluation of the signal of the concentration sensor only in predetermined operating states, for example when the pump unit is turned off. This can improve the measurement result. For example, air bubbles may occur in the liquid reservoir during operation, which falsify the measurement result.
  • This can be detected by the arrangement of a third sensor in the manner described, so that, for example, the evaluation of a signal of the concentration sensor only in such Operating conditions occur in which no impairment of the measurement result is expected.
  • the liquid receiver is preferably filled with an oil or glycol-containing liquid mixture.
  • the liquid mixture may contain a mixture of glycol and water.
  • the concentration sensor and the evaluation device are preferably designed to detect the concentration of water in the liquid reservoir, so that penetration of the water can be detected and thus a warning message can be generated if the seal facing the pump chamber becomes leaky.
  • the pump unit is a water pump unit and more preferably a sewage pump unit.
  • Such pump units may be designed as submersible pumps and it is important that the engine compartment, in which the dry running electric drive motor is arranged, is reliably sealed.
  • the evaluation device is designed such that it calculates or predicts a period of time until the next due maintenance of the pump assembly based on the evaluation of the measured values of the concentration sensor.
  • maintenance is for example the replacement of a seal, that is, a shaft seal to understand.
  • the evaluation device or a control device connected to the evaluation device can estimate the time for the next due maintenance. This can be done on the basis of extrapolation based on the previously acquired measurements of the concentration sensor. For example, there may be a sudden increase from substantially constant readings indicating that the seal is to be replaced in the near future. Here can be an exponential There is a tendency, which can be taken into account by the evaluation device and a connected control device.
  • the invention further provides a method for detecting a change in concentration in a liquid reservoir in a sealing arrangement in a pump unit, wherein at least one measured value of a concentration sensor arranged on the liquid template as a function of at least one further parameter of the liquid reservoir and preferably in dependence of the temperature or a temperature-dependent parameter of the liquid template is evaluated.
  • a temperature influence on the measurement result of a concentration sensor can be compensated. This can be done in the manner described above with reference to the pump unit.
  • the foregoing description of the pump unit is described. Processes described therein or processes resulting from the configuration of the pump unit are likewise preferred subject matter of the method according to the invention.
  • the evaluation of the at least one measured value of the concentration sensor is particularly preferably suspended if the temperature of the liquid receiver is above an upper limit value or below a lower limit value.
  • an average value is formed in the evaluation from a plurality of measured values of the concentration sensor, wherein the individual Furthermore, measured values may be weighted differently depending on a further parameter and preferably as a function of the respectively detected temperature and / or as a function of time. In particular, measured values which were recorded at a lower temperature, as described above with reference to the pump unit, can be weighted higher.
  • the pump unit according to the invention which exemplifies in FIGS. 1 and 2 is shown, is designed as a submersible pump unit.
  • the pump unit has in a known manner an electric Drive motor 2 with an attached pump housing 4.
  • the pump housing 4 has on its underside an inlet opening 6 and a radial pressure port 8.
  • the pump housing 4 includes in its interior in a known manner a pump chamber in which an impeller (not shown here) rotates.
  • the impeller is rotatably connected to the drive shaft or shaft 14 of the drive motor 6.
  • the shaft 14 is rotatably connected to the rotor 16 of the drive motor, which rotates in a known manner in the interior of the stator 18.
  • the drive motor 6 is designed as a dry-running motor, ie the interior of the drive motor 2 is completely sealed relative to the pump space in the interior of the pump housing 4, to which the shaft 14 is passed through a seal assembly 20.
  • the seal assembly 20 has a liquid reservoir 22 inside a limited by a seal housing 24 chamber.
  • the seal assembly 20 also has two seals 26 and 28, which are formed as shaft seals and through which the shaft 14 is guided sealingly.
  • the seal 26 forms a first seal, which faces the pump housing 4, while the seal 28 forms a second seal, which faces the drive motor 2.
  • the liquid template 22 is located. If now the first seal 26 should fail, liquid from the pump housing 4 penetrates into the interior of the liquid template 22, which can be detected. As expected, the first seal 26 will wear sooner than the second seal 28, whereby the wear of the seal can be detected before liquid from the liquid reservoir 22 in the interior of the drive motor 2 invades.
  • the structure of the liquid template 22 will be described in more detail below with reference to Fig. 3 described.
  • the liquid receiver 22 may preferably be filled with a liquid mixture containing oil or glycol, in particular with a glycol-water mixture.
  • the mixture can contain other additives or additives besides glycol and water.
  • a concentration sensor 30 which is inserted into the seal housing 24 of the seal arrangement 20 is used.
  • the concentration sensor 30 extends into the interior of the chamber in which the liquid reservoir 22 is located.
  • a second sensor 32 is arranged on the seal housing 24, which is formed in this case as a temperature sensor.
  • the second sensor 32 may also be designed as a combined sensor which detects a plurality of parameters, for example temperature and pressure and / or vibrations. So can, as in FIG. 3 shown, in the second sensor, a vibration sensor 33 may be integrated as a third sensor.
  • the vibration sensor 33 serves to detect whether the pump set is in operation or not.
  • Both the concentration sensor 30 and the second sensor 32 are connected to an evaluation device 34.
  • the output signals of the vibration sensor 33 are evaluated by the evaluation device 34, for example, to suspend the evaluation of the other sensor in case of excessive vibration.
  • the evaluation device 34 may be part of a control electronics 36 in the interior of the electronics housing 10 (see Fig. 2 ), which controls the drive motor 2.
  • the concentration sensor 30 is formed in this embodiment as an ultrasonic sensor, as it is based on Fig. 4 described becomes.
  • the concentration sensor 30 has a transmitting / receiving unit 38 which emits an ultrasonic signal into the interior of the liquid original 22 towards an opposite wall 40. On the wall 40, the signal is reflected and sent back to the transmitting / receiving unit 38, at which the signal is received again.
  • the transmitting / receiving unit 38 is connected to the evaluation device 34, which can detect the signal propagation time of the ultrasonic signal between the transmitting / receiving unit 38 and the wall 40.
  • the speed of sound of the liquid original 22 changes in a concentration-dependent manner, so that changes in concentration can be detected by the evaluation unit 34 from the transit time and thus the speed of the signal in the liquid original 22.
  • the transmitting / receiving unit 38 may be formed, for example, as a piezoelectric element.
  • Fig. 5 For example, signal velocity traces within fluid reservoir 22 are shown for four different concentrations conc0, concl, conc2 and conc3. It is in Fig. 5 the speed u is plotted against the temperature T. It can be seen that the speed differences between the individual concentrations decrease with increasing temperature T. Ie. the measurement accuracy of the concentration decreases with increasing temperature. From a temperature limit Tg accurate measurement is no longer possible. Therefore, the invention provides that the evaluation device 34 preferably suspends the evaluation of the measurement result of the concentration sensor 30 when the temperature Tg is exceeded.
  • a wastewater pump is usually not operated continuously but at intervals. During operation, the temperature rises.
  • the temperature drops again, so that it may occur regularly during operation that the temperature limit Tg is exceeded, but then falls below again.
  • the concentration measurement or evaluation of the measured value of the concentration sensor 30 is then by the evaluation device 34 only for measurements at temperatures below the temperature limit Tg made.
  • the concentration determination in the liquid original 22 can be determined by the evaluation device 34, for example in the context of Fig. 6 done manner described.
  • a current temperature T i are detected by the concentration sensor 30th
  • T thres corresponds to T g
  • a corrected concentration value C out is determined as a function of the measured concentration values C i , the measured temperature values T i and the time t i in step S 2.
  • the concentration C out can be determined as a weighted average value of a multiplicity of concentrations C i measured over a relatively long period of time, in particular as a running average.
  • the weighting can be time-dependent and / or temperature-dependent.
  • the weighting is preferably such that measurements at low temperatures are weighted higher than measurements at higher temperatures. This can be done according to a linear function or also an inverse sigmoid function or another suitable mathematical function.
  • step S3 If in step S1 should be noted that the temperature T i above the set temperature limit T thres is (N) is checked in step S3 whether the period t since the last determination of a concentration value C out is smaller than a predetermined interval t is interval. If this is the case (Y), C out is set to the last specific value in step A1. If it is determined in step S3 that the time interval t is equal to or greater than the predetermined interval t interval (N) is set and at the same time a warning message, in step A2, the concentration value C out on the last determined value that no current measurement or determination of the concentration is possible.
  • the determination of the concentration C out (estimated or corrected concentration) based on the temperature T i and the measured concentration measurement value C i could also be done in other ways, for example using a neural network.
  • a neural network could adapt to changes in ambient and operating conditions and adaptively adjust the correction of the concentration measurement value C i as a function of the temperature.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)
EP18163562.4A 2018-03-23 2018-03-23 Groupe pompe ainsi que procédé de surveillance d'alimentation en liquide dans un dispositif d'étanchéité dans un groupe pompe Active EP3543537B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP18163562.4A EP3543537B1 (fr) 2018-03-23 2018-03-23 Groupe pompe ainsi que procédé de surveillance d'alimentation en liquide dans un dispositif d'étanchéité dans un groupe pompe
US16/361,525 US11143190B2 (en) 2018-03-23 2019-03-22 Pump assembly having an impeller, a motor, and a shaft, with the shaft passing from the motor to the impeller through a fluid reservoir and a seal arrangemnet with a tration
CN201910227128.4A CN110296099B (zh) 2018-03-23 2019-03-25 泵机组以及用于监视泵机组中的密封结构中的液体部的方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18163562.4A EP3543537B1 (fr) 2018-03-23 2018-03-23 Groupe pompe ainsi que procédé de surveillance d'alimentation en liquide dans un dispositif d'étanchéité dans un groupe pompe

Publications (2)

Publication Number Publication Date
EP3543537A1 true EP3543537A1 (fr) 2019-09-25
EP3543537B1 EP3543537B1 (fr) 2022-01-05

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EP18163562.4A Active EP3543537B1 (fr) 2018-03-23 2018-03-23 Groupe pompe ainsi que procédé de surveillance d'alimentation en liquide dans un dispositif d'étanchéité dans un groupe pompe

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US (1) US11143190B2 (fr)
EP (1) EP3543537B1 (fr)
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CN113250990B (zh) * 2021-07-14 2021-10-08 亿昇(天津)科技有限公司 一种压缩机检测装置、压缩机及检测方法
DE102021211874B4 (de) 2021-10-21 2024-07-11 Vitesco Technologies GmbH Verfahren und Vorrichtung zur Detektion einer zu erwartenden Eisbildung innerhalb eines Waschsystems eines Fahrzeugs

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US20190293073A1 (en) 2019-09-26
US11143190B2 (en) 2021-10-12
CN110296099B (zh) 2020-12-11
CN110296099A (zh) 2019-10-01

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