WO2024213216A1 - Système et procédé de détection de coup de bélier - Google Patents

Système et procédé de détection de coup de bélier Download PDF

Info

Publication number
WO2024213216A1
WO2024213216A1 PCT/DK2024/050086 DK2024050086W WO2024213216A1 WO 2024213216 A1 WO2024213216 A1 WO 2024213216A1 DK 2024050086 W DK2024050086 W DK 2024050086W WO 2024213216 A1 WO2024213216 A1 WO 2024213216A1
Authority
WO
WIPO (PCT)
Prior art keywords
motor
speed
positive peak
alternating portion
detection unit
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.)
Ceased
Application number
PCT/DK2024/050086
Other languages
English (en)
Inventor
Eva Kühne
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EWA Sensors ApS
Original Assignee
EWA Sensors ApS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by EWA Sensors ApS filed Critical EWA Sensors ApS
Priority to EP24788286.3A priority Critical patent/EP4695517A1/fr
Publication of WO2024213216A1 publication Critical patent/WO2024213216A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H1/00—Measuring characteristics of vibrations in solids by using direct conduction to the detector
    • G01H1/003—Measuring characteristics of vibrations in solids by using direct conduction to the detector of rotating 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
    • 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
    • F04D15/0077—Safety measures
    • F04D15/0083—Protection against sudden pressure change, e.g. check valves
    • 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
    • F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2270/00—Control
    • F05D2270/80—Devices generating input signals, e.g. transducers, sensors, cameras or strain gauges
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2270/00—Control
    • F05D2270/80—Devices generating input signals, e.g. transducers, sensors, cameras or strain gauges
    • F05D2270/807—Accelerometers

Definitions

  • the present invention relates to a method for monitoring water hammer in an environment comprising at least one pump having an electrical induction motor, wherein the at least one pump is in fluid communication with a number of pipes and configured to pump a media.
  • the present invention also relates to a water hammer detection system for monitoring water hammer in an environment comprising at least one pump having an electrical induction motor, wherein the at least one pump is in fluid communication with a number of pipes and configured to pump a media.
  • Water hammer is a pressure surge or wave, caused when a fluid in motion is forced to stop or change direction suddenly - a momentum change. This phenomenon commonly occurs when a valve closes suddenly at an end of a pipeline system, and a pressure wave propagates in the pipe.
  • This pressure wave can cause major problems, from noise and vibration to pipe rupture or collapse.
  • the slip speed is the difference between an electrical induction motor's synchronous and asynchronous speed e.g. measured as revolutions per minute (RPM).
  • the synchronous speed is the speed of the revolution of the magnetic field in the stator winding of the motor.
  • the asynchronous speed is the rotating speed of the motor shaft.
  • the slip speed S is defined as the difference between the rotational speed of the motor ⁇ M and the synchronous speed ⁇ B of the magnetic fields of the motor: This can be defined as:
  • US 20170248142 Al discloses a method for detecting faults or operational parameters in a pump assembly by use of a handheld communication device.
  • the pump assembly includes an electric motor and a pump, wherein the pump assembly or electric motor has at least one rotating shaft
  • the method comprises the steps of: a) contactless measuring a sound signal emanating from the pump assembly by use of a microphone connected to or implemented in the handheld communication device, b) processing the measured sound signal, and c) recognising one or more sound emanating condition including any possible faults by way of the processed sound signal. It would be desirable to have an alternative solution that is simpler and cheaper.
  • US 20200182684 Al discloses a system for continuously monitoring at least one machine including a plurality of magnetic sensors synchronously sensing magnetic fields emitted by at least one machine.
  • the plurality of magnetic sensors are sensing the magnetic fields along a corresponding plurality of channels and outputting magnetic field emission signals corresponding to the magnetic fields.
  • a signal analyser is receiving at least a portion of the magnetic field emission signals and performing analysis of the magnetic field emission signals.
  • the signal analyser is providing an output based on the analysis, wherein the output includes at least an indication of a condition of the at least one machine.
  • a control module is receiving the indication of the condition and initiating at least one of a repair event on the at least one machine. An adjustment to a maintenance schedule of the at least one machine and an adjustment to an operating parameter of the at least one machine based on the indication. It would be desirable to have an alternative solution that is simpler and cheaper.
  • the method comprises: a) determining if the alternating portion A 1 is repeated or not and b) if the alternating portion A 1 (t) is repeated it is concluded that water hamming is occurring.
  • the method determines if the alternating portion A 1 is repeated within a predefined time from a previous alternating portion A 1 .
  • the predefined time is in the range 0.01-10 times the duration of the previous alternating portion A 1 .
  • the predefined time is in the range 0.02-5 times the duration of the previous alternating portion A 1 .
  • the predefined time is in the range 0.2-3 times the duration of the previous alternating portion A 1 .
  • the method is suitable for detecting water hammer in an environment comprising at least one pump having an electrical induction motor.
  • the method is suitable for monitoring water hammer in an environment comprising at least one pump having an electrical induction motor.
  • At least one pump is in fluid communication with a number of pipes and configured to pump a media.
  • the pump would typicall be connected to an inlet pipe that delivers the media to be pumped.
  • the pump would typically be connected to an outlet pipe receiving media that is pressurised by the pump.
  • the method comprises the step of detecting the synchronous speed ⁇ B of the magnetic field of the motor. In an embodiment, this step is carried out by applying a non-invasively installed detection unit.
  • the detection unit comprises a sensor configured to detect a magnetic field.
  • the method comprises the step of detecting the rotational speed ⁇ M of the motor. In an embodiment, this step is carried out by applying a non- invasively installed detection unit.
  • the detection unit comprises a sensor configured to detect vibrations.
  • the system is configured to determine the rotational speed ⁇ M of the motor on the basis of detected vibration data.
  • the method comprises the step of, for a predefined time period, on the basis of the detected synchronous speed ⁇ B (t) of the magnetic field of the motor and the rotational speed ⁇ M (t) of the motor calculating the slip speed S(t) of the motor as function of time.
  • the slip speed S(t) is defined as the difference between the synchronous speed ⁇ B (t) of the magnetic field of the motor and the rotational speed ⁇ M (t) of the motor:
  • the method comprises the step of, for a predefined time period, on the basis of the detected synchronous speed ⁇ B (t) of the magnetic field of the motor and the rotational speed ⁇ M (t) of the motor determining the alternating portion A 1 (t) of the slip speed S(t).
  • the method comprises the step of analysing an alternating portion A 1 (t) of the slip speed S(t) and concluding that water hammer is present in one of the pipes if: a) the alternating portion A 1 (t) of the slip speed S(t) comprises three spaced apart positive peaks P 1 , P 3 , P5, wherein the time ti between the first positive peak P 1 and the second positive peak P 3 is larger than the time t 2 between the second positive peak P 3 and the third positive peak P 5 and b) the first positive peak P 1 is larger than the second positive peak P 3 and the second positive peak P 3 is larger than the third positive peak P 5 .
  • the peaks can be detected by using any suitable peak detection technique.
  • the peak detection technique applies the fact that the first derivative of a peak has a downward-going zero- crossing at the peak maximum. To avoid false zero-crossing due to the noise, it is possible to: a) first smooth the first derivative of the signal, before looking for downward-going zero-crossings, and b) take only those zero crossings whose slope exceeds a certain predetermined minimum (slope threshold) at a point where the original signal exceeds a certain minimum (amplitude threshold).
  • the method comprises the step of determining the mean value of the slip speed S(t), wherein the alternating portion A 1 (t) of the slip speed S(t) is determined by subtracting the mean value of the slip speed S(t) from the slip speed S(t).
  • the method comprises the step of applying a detection unit that is attached to the motor of the pump, wherein the detection unit is configured to measure the magnetic field of a stator of the motor and hereby determine the synchronous speed ⁇ B of the magnetic field of the motor.
  • the method comprises the step of applying a detection unit that is attached to the motor of the pump, wherein the detection unit is configured to detect vibrations and hereby determine the rotational speed ⁇ M of the motor.
  • the detection unit that is detachably attached to the motor of the pump.
  • the detection unit is attached to the motor of the pump by using mechanical fastening structures including bolts, a hose clamp, or a mounting bracket.
  • the motor comprises a motor shaft
  • the detection unit is configured to, on the basis of the vibrations detected by the detection unit, determine the rotational speed ⁇ M of the motor shaft. Determination of the rotational speed ⁇ M of the motor shaft may be carried out by using prior art technique disclosed in US 11009520 B2 or in the article "A Method for Estimation of Motor Rotational Speed from STFT Spectrogram at a Non-stationary Conditions" IFAC-PapersOnLine Volume 51, Issue 6, 2018, Pages 283-288.
  • the method comprises the step of determining that a foreign body is in the pumped media if: a) the alternating portion A 1 (t), A 2 (t), A 3 (t) comprises a U-shaped peak having a peak level that is larger than three times the average of the alternating portion A 1 (t), A 2 (t), A 3 (t) outside the U-shaped peak.
  • the area below a single U-shaped positive peak having a duration t 3 is more than 10 times the area below any adjacent signal for a time corresponding to two times the duration t 3 .
  • the method comprises the step of determining that gravel is in the pumped media (18) if the variance of the alternating portion A 1 (t), A 2 (t), A 3 (t) is larger than three times the average of the alternating portion A 1 (t), A 2 (t), A 3 (t).
  • the detection unit comprises a communication module configured to wirelessly transmit detected data.
  • the detection unit comprises a housing, wherein an accelerometer and a coil assembly is provided in the housing.
  • coil assembly is configured to determine the amplitude of the magnetic field of the motor. In an embodiment, coil assembly is configured to determine the direction of the magnetic field of the motor.
  • coil assembly is configured to determine the direction of the magnetic field in two dimensions.
  • coil assembly is configured to determine the direction of the magnetic field in three dimensions.
  • a communication module is provided in the housing.
  • the water hammer detection system for monitoring water hammer in an environment comprising at least one pump having an electrical induction motor, wherein the at least one pump is in fluid communication with a number of pipes and configured to pump a media, wherein the system comprises a detection unit arranged and configured for detecting: a) the synchronous speed ⁇ B of the magnetic field of the motor and b) the rotational speed ⁇ M of the motor, wherein the system is configured to: for a predefined time period, on the basis of the detected synchronous speed ⁇ B (t) of the magnetic field of the motor and the rotational speed ⁇ M (t) of the motor calculate the slip speed S(t) of the motor as function of time t, wherein the slip speed S(t) is defined as the difference between the synchronous speed ⁇ B (t) of the magnetic field of the motor and the rotational speed ⁇ M (t) of the motor:
  • the system is configured to: a) determine if the alternating portion A 1 is repeated or not and b) if the alternating portion A 1 (t) is repeated it is concluded that water hamming is occurring.
  • the system is configured to determine if the alternating portion A 1 is repeated within a predefined time from a previous alternating portion A 1 .
  • the predefined time is in the range 0.01-10 times the duration of the previous alternating portion A 1 .
  • the predefined time is in the range 0.02- 5 times the duration of the previous alternating portion A 1 .
  • the predefined time is in the range 0.2-3 times the duration of the previous alternating portion A 1 .
  • the system is suitable of detecting water hammer in an environment comprising at least one pump having an electrical induction motor.
  • the system is suitable for monitoring water hammer in an environment comprising at least one pump having an electrical induction motor.
  • the system according to the invention is a water hammer detection system for monitoring water hammer in an environment comprising at least one pump having an electrical induction motor, wherein the at least one pump is in fluid communication with a number of pipes and configured to pump a media.
  • the media is a water containing media. In an embodiment, the media is water.
  • the system comprises a detection unit arranged and configured for detecting: a) the synchronous speed ⁇ B of the magnetic field of the motor and b) the rotational speed ⁇ M of the motor.
  • the detection unit comprises a vibration sensor.
  • the detection unit comprises a magnetic field sensor.
  • the system is configured to: for a predefined time period, on the basis of the detected synchronous speed ⁇ B (t) of the magnetic field of the motor and the rotational speed ⁇ M (t) of the motor calculate the slip speed S(t) of the motor as function of time t, wherein the slip speed S(t) is defined as the difference between the synchronous speed ⁇ B (t) of the magnetic field of the motor and the rotational speed ⁇ M (t) of the motor:
  • the system is configured to determine the alternating portion A 1 (t) of the slip speed S(t).
  • the system is configured to analyse the alternating portion A 1 (t) of the slip speed S(t) and concluding that water hammer is present in one of the pipes if: a) the alternating portion A 1 (t) of the slip speed S(t) comprises three spaced apart positive peaks P 1 , P 3 , P5, wherein the time ti between the first positive peak P 1 and the second positive peak P 3 is larger than the time t 2 between the second positive peak P 3 and the third positive peak P 5 i and b) the first positive peak P 1 is larger than the second positive peak P 3 and the second positive peak P 3 is larger than the third positive peak P 5 .
  • the system is configured to determine the mean value of the slip speed S(t), wherein the alternating portion A 1 (t) of the slip speed S(t) is determined by subtracting the mean value of the slip speed S(t) from the slip speed S(t).
  • the detection unit is attached to the motor of the pump, wherein the detection unit is configured to measure the magnetic field of a stator of the motor and hereby determine the synchronous speed ⁇ B of the magnetic field of the motor.
  • the detection unit is attached to the motor of the pump, wherein the detection unit is configured to detect vibrations and hereby determine the rotational speed ⁇ M of the motor.
  • the detection unit is detachably attached to the motor of the pump.
  • the motor comprises a motor shaft, wherein the wherein the detection unit is configured to, on the basis of the detected vibrations determine the rotational speed ⁇ M of the motor shaft.
  • the system is configured to determine that a foreign body is in the pumped media if: a) the alternating portion A 1 (t), A 2 (t), A 3 (t) comprises a U-shaped peak having a peak level that is larger than three times the average of the alternating portion A 1 (t), A 2 (t), A 3 (t) outside the U-shaped peak.
  • the system is configured to determine that gravel is in the pumped media if the variance of the alternating portion (A 1 (t), A 2 (t), A 3 (t)) is larger than three times the average of the alternating portion (A 1 (t), A 2 (t), A 3 (t)).
  • the detection unit comprises a communication module configured to wirelessly transmit detected data.
  • the detection unit comprises a housing, wherein an accelerometer and a coil assembly is provided in the housing.
  • coil assembly is configured to determine the amplitude of the magnetic field of the motor.
  • coil assembly is configured to determine the direction of the magnetic field of the motor.
  • coil assembly comprises two coils arranged and configured to determine the direction of the magnetic field of the motor.
  • coil assembly comprises three coils arranged and configured to determine the direction of the magnetic field of the motor.
  • a communication module is provided in the housing.
  • the detection unit comprises a tachometer arranged and configured to measure the rotation speed of the shaft of the motor.
  • a tachometer is arranged in the housing. By using the tachometer, which is also known as a revolution-counter or RPM gauge, it is possible to measure the rotation speed of the shaft of the motor.
  • At least one Hall effect sensor is arranged in the housing. Hereby, it is possible to detect the presence and magnitude of the magnetic field of the motor.
  • Fig. 1 shows a schematic view of a system according to the invention
  • Fig. 2 shows two curves depicting the synchronous speed ⁇ B of the magnetic fields of the motor and the rotational speed ⁇ M of the motor as function of time t;
  • Fig. 3A shows the alternating portion A 1 (t) of the slip speed S(t) as function of time t in a situation, in which water hammer is occurring;
  • Fig. 3B shows the alternating portion A 2 (t) of the slip speed S(t) as function of time t in a situation, in which a foreign body is in the media being pumped by the pump;
  • Fig. 3C shows the alternating portion A 3 (t) of the slip speed S(t) as function of time t in a situation, in which gravel is in the pumped media;
  • Fig. 4 shows a flowchart illustrating the steps of a method according to the invention
  • Fig. 5A shows a pipe 12 with no flowing media due to a closed valve
  • Fig. 5B shows the pipe 12 shown in Fig. 5A, in a configuration in which the media is flowing through the open valve
  • Fig. 5C shows the pipe 12 shown in Fig. 5B, in a configuration in which water hammer occurs when the valve is being closed;
  • Fig. 6 shows a system according to the invention
  • Fig. 7A shows a detection unit according to the invention
  • Fig. 7B shows another detection unit according to the invention.
  • a system 2 of the present invention is illustrated in Fig. 1.
  • Fig. 1 illustrates a water hammer detection system 2 for monitoring water hammer in an environment 20.
  • the environment 20 comprises at a pump 4 having an electrical induction motor 8.
  • the pump 4 is in fluid communication with an inlet pipe 12' and an outlet pipe 12.
  • the pump 4 is arranged and configured to pump a media.
  • the media will typically be a liquid, preferably a water-containing liquid.
  • the pump 4 is arranged and configured to pump sewage water.
  • the system 2 comprises a detection unit 24 arranged and configured to detect: a) the synchronous speed ⁇ B (t) of the magnetic field of the motor 8 and b) the rotational speed ⁇ M (t) of the motor 8.
  • the system 2 is configured to for a predefined time period, on the basis of the detected synchronous speed ⁇ B (t) of the magnetic field of the motor 8 and the rotational speed ⁇ M (t) of the motor 8 calculate the slip speed S(t) of the motor 8 as function of time (t).
  • the slip speed S(t) is defined as the difference between the synchronous speed ⁇ B (t) of the magnetic field of the motor 8 and the rotational speed ⁇ M (t) of the motor 8. Accordingly, the slip speed can be defined by the following equation S(t) :
  • the detection unit 24 is configured to determine the alternating portion A 1 (t) of the slip speed S (t) by calculating the mean value of the slip speed S(t) by using of a filter 16.
  • Fig. 1 illustrates that the slip speed S(t) of the motor 8 as S as function of time (t) can be split into two components:
  • Fig. 2 illustrates a first curve depicting the synchronous speed ⁇ B (frequency F) of the magnetic fields of the motor as function of time t.
  • Fig. 2 also illustrates a second curve depicting the rotational speed ⁇ M (frequency F) of the motor as function of time t.
  • the mean value C of the slip speed (the difference between the synchronous speed ⁇ B of the magnetic fields of the motor and the rotational speed ⁇ M of the motor is indicated.
  • Fig. 3A illustrates the alternating portion A 1 (t) of the slip speed S(t) as function of time t in a situation, in which water hammer is occurring.
  • a first condition is fulfilled since: a) the alternating portion A 1 (t) of the slip speed S(t) comprises three spaced apart positive peaks P 1 , P 3 , P5, wherein P 1 > P 3 > P5 b) the time ti between the first positive peak P 1 and the second positive peak P 3 is larger than the time t 3 between the second positive peak P 3 and the third positive peak P 5 .
  • the water hammer signature is repeated.
  • the method takes advantage of this by requiring repetition of the signature as a criterion when it should be determined that water hammer is present.
  • Fig. 3B illustrates the alternating portion A 2 (t) of the slip speed S(t) as function of time t in a situation, in which a foreign body is in the media being pumped by the pump.
  • the alternating portion A 2 (t) contains a U- shaped positive peak having a peak level L 4 that is larger than three times the RMS of the alternating portion A 2 (t) outside the U-shaped peak.
  • the U-shaped positive peak has a duration t 3 .
  • the area below a single U-shaped positive peak is more than 10 times the area below any adjacent signal for a time corresponding to two times the duration t 3 .
  • Fig. 3C illustrates the alternating portion A 3 (t) of the slip speed S(t) as function of time t in a situation, in which gravel is in the pumped media.
  • the variance of the alternating portion A 3 (t) is larger than three times the RMS of the alternating portion A 3 (t).
  • the alternating portion A 3 (t) contains a series of peaks having peak levels L 6 , L 7 , L 8 that are larger than the amplitude Lg of the remaining portion of the alternating portion A 3 (t).
  • Fig. 4 illustrates a flowchart illustrating the steps of a method according to the invention.
  • the first step the synchronous speed ⁇ B (t) of the magnetic field of the motor 8 and the rotational speed ⁇ M (t) of the motor 8 is provided.
  • the slip speed S(t) of the motor 8 as function of time t is calculated by using the formula:
  • the alternating portion A 1 (t) of the slip speed S(t) is determined and analyses.
  • the next step is determined if the alternating portion A 1 (t) of the slip speed S(t) comprises several spaced apart positive peaks P 1 , P3, P5, wherein the time ti, t 2 between adjacent positive peaks P 1 , P3, P5 fulfills that ti > t 2 . If this condition is not fulfilled, the first method will start over from the initial step. If, on the other hand, this condition is fulfilled, the method will continue to the next step, in which it is determined if the part of the level L2 of the first of said positive peaks P 1 is at least three times as large as the level Li of the part of the alternating portion A 1 (t) of the slip speed S(t) that contains none of said positive peaks P 1 , P3, Ps.
  • this condition is not fulfilled, the first method will start over from the initial step. If, on the other hand, this condition is fulfilled, it is concluded that a pressure shockwave is present: Accordingly, the conditions for water hamming are present. In order to ensure that water hamming is occurring it is, however, determined if the alternating portion A 1 (t) is repeated or not. If the alternating portion A 1 (t) is repeated (like shown in and explained with reference to Fig. 3A) it can be concluded that water hamming is occurring.
  • Fig. 5A illustrates a pipe 12 with no flowing media 18 because the valve 14 is closed.
  • Fig. 5B illustrates the pipe 12 shown in Fig. 5A, in a configuration in which the media 18 is flowing through the open valve 14. The direction of the media 18 is indicated with arrows.
  • Fig. 5C illustrates the pipe 12 shown in Fig. 5B, in a configuration in which water hammer 10 occurs when the valve 14 is being closed.
  • Fig. 6 illustrates a system 2 according to the invention.
  • the system 2 comprises a rotatory machine 4 that is mechanically connected to a floor 34.
  • the rotatory machine is a pump 4 comprises a motor 8 provided with a motor shaft 22.
  • the motor 8 is arranged and configured to rotate a pump shaft 15 of a pump that is driven by the motor 8.
  • the pump shaft 15 is connected to the motor 8 via a coupling 11.
  • the system 2 comprises a detection unit 24 placed on the motor 8 of the first rotatory machine 4.
  • the detection unit 24 is configured to be attached to and hereby detect vibration data 28 of the rotatory machine 4.
  • the system 2 comprises a processing unit 32 configured to receive and process said data 28.
  • the processing unit 32 may be contained in a webbased server accessible via the Internet 30.
  • the processing unit 32 is integrated in the detection unit 24.
  • the processing unit 32 is integrated in an external device (e.g. a laptop computer or a tablet that is communicatively connected to the detection unit 24).
  • the rotatory machine 4 is mechanically connected to the floor 34 via a base member 20 placed on the floor 34.
  • the system 2 is designed for monitoring water hammer in an environment comprising the rotary machine 4 formed as a pump.
  • the pump housing 17 is connected to and receives a media to be pumped via an inlet pipe 12'.
  • the pump housing 17 is connected to and pumps the media out through an outlet pipe 12.
  • the pump 4 may be different from the ones shown in Fig. 1.
  • the rotatory machine(s) are pumps, wherein the motor and the pump are joint (built together or integrated).
  • the rotatory machine(s) are pumps, wherein the motor of the pump is fixed the pump housing of the pump.
  • the detection unit 24 may be attached to any suitable structure of the motor 8.
  • the attachment may be established by using any suitable mechanical fastening structures including bolts, a hose clamp, or a mounting bracket.
  • Fig. 7A illustrates a detection unit 24 according to the invention.
  • the detection unit 24 comprises a housing 40 configured to be attached to a motor of a pump.
  • the detection unit 24 comprises a battery 42 for providing electrical power to the detection unit 24.
  • the detection unit 24 comprises a printed circuit board 44 provided with a communication module 36.
  • the communication module 36 is configured to communicate wirelessly with an external device (e.g. via a local network).
  • the detection unit 24 comprises a modem configured for sending digital data wirelessly.
  • detection unit 24 comprises a Bluetooth radio module with built-in antenna.
  • the detection unit 24 comprises an accelerometer 38 arranged and configured to detect vibrations of the detection unit 24. Accordingly, when the detection unit 24 is attached to a motor, the accelerometer 38 ci capable of detecting the vibrations of the motor.
  • the accelerometer 38 is a multi-axis accelerometer configured to detect both the magnitude and the direction of the proper acceleration, as a vector quantity.
  • the accelerometer 38 is a two-axis accelerometer.
  • the accelerometer 38 is a three-axis accelerometer.
  • the accelerometer 38 is a single-axis accelerometer 38.
  • the accelerometer 38 is a micromachined microelectromechanical systems (MEMS).
  • MEMS micromachined microelectromechanical systems
  • the detection unit 24 comprises a control unit.
  • the control unit comprises a processing unit.
  • the detection unit 24 comprises a coil assembly 60 arranged and configured to detect the magnetic field of a motor to which the detection device is attached.
  • the coil assembly 60 comprise one or more coils arranged and configured to detect the direction and magnitude of the magnetic field of the motor.
  • the coil assembly 60 comprise two coils arranged and configured to detect the direction and magnitude of the magnetic field of the motor.
  • the coil assembly 60 comprise three coils arranged and configured to detect the direction and magnitude of the magnetic field of the motor.
  • Fig. 7B illustrates another detection unit according to the invention.
  • the detection unit 24 comprises a housing 40 configured to be attached to a rotatory machine such as a pump or motor.
  • the detection unit 24 comprises a power supply 46 connected to a power cable 48 protruding from the housing 40.
  • the detection unit 24 comprises a printed circuit board 44 provided with a communication module 36.
  • the communication module 36 is connected to an external device by using a data cable 52.
  • the data cable 52 may be electronically connected to a control box of rotatory machine (e.g. a pump).
  • the detection unit 24 comprises no communication module but is electrically connected to an external communication module (e.g. built into an external device such as a control box of a pump or a motor).
  • the detection unit 24 comprises an accelerometer 38 corresponding to the one shown and explained with reference to Fig. 7A.
  • the detection unit 24 comprises a control unit.
  • the control unit comprises a processing unit.
  • the detection unit 24 comprises a coil assembly 60 arranged and configured to detect the magnetic field of a motor to which the detection device is attached.
  • the coil assembly 60 comprise one or more coils arranged and configured to detect the direction and magnitude of the magnetic field of the motor.
  • the coil assembly 60 comprise two coils arranged and configured to detect the direction and magnitude of the magnetic field of the motor.
  • the coil assembly 60 comprise three coils arranged and configured to detect the direction and magnitude of the magnetic field of the motor.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Abstract

L'invention divulgue un procédé de surveillance de coup de bélier (10) dans un environnement (20) comprenant au moins une pompe (4) ayant un moteur à induction électrique (8). Ladite pompe (4) est en communication fluidique avec un nombre de tuyaux (12, 12') et conçue pour pomper un milieu (18), le procédé comprenant l'étape consistant à détecter : a) la vitesse synchrone (co g) du champ magnétique du moteur (8) et b) la vitesse de rotation (co M) du moteur (8). Le procédé comprend les étapes suivantes : - pendant une période de temps prédéfinie, sur la base de la vitesse synchrone détectée (co g(t)) du champ magnétique du moteur (8) et de la vitesse de rotation (co M(0)) du moteur (8) calculer la vitesse de glissement (S(t)) du moteur (8) en fonction du temps (t), la vitesse de glissement (S(t)) étant définie comme la différence entre la vitesse synchrone (co g(0)) du champ magnétique du moteur (8) et la vitesse de rotation (co M(0)) du moteur (8) : (2) S(t) = (co g(t) - co M(1))/KI g déterminer la partie alternative (A i (t)) de la vitesse de glissement (S(t)) ; analyser la partie alternative (A i (t)) de la vitesse de glissement (S(t)) et conclure que le coup de bélier (10) est présent dans l'un des tuyaux (12, 12') si : a) la partie alternative (A i (t), A 2(0, A (t)) de la vitesse de glissement (S(t)) comprend trois pics positifs (P i, P 3, P 5) espacés, le temps (t 1) entre le premier pic positif (P 1) et le deuxième pic positif (P 3) étant plus grand que temps (t 2) entre le deuxième pic positif (P 3) et le troisième pic positif (P 5) et b) le premier pic positif (P1) est plus grand que le deuxième pic positif (P 3) et le deuxième pic positif (P3) est plus grand que le troisième pic positif (P 5).
PCT/DK2024/050086 2023-04-12 2024-04-09 Système et procédé de détection de coup de bélier Ceased WO2024213216A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP24788286.3A EP4695517A1 (fr) 2023-04-12 2024-04-09 Système et procédé de détection de coup de bélier

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA202300317A DK181714B1 (en) 2023-04-12 2023-04-12 System and method for detecting pressure surges
DKPA202300317 2023-04-12

Publications (1)

Publication Number Publication Date
WO2024213216A1 true WO2024213216A1 (fr) 2024-10-17

Family

ID=93058828

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK2024/050086 Ceased WO2024213216A1 (fr) 2023-04-12 2024-04-09 Système et procédé de détection de coup de bélier

Country Status (3)

Country Link
EP (1) EP4695517A1 (fr)
DK (1) DK181714B1 (fr)
WO (1) WO2024213216A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060071666A1 (en) * 1999-09-28 2006-04-06 Reliance Electric Technologies, Llc Detection of pump cavitation/blockage and seal failure via current signature analysis
US20060127227A1 (en) * 2004-04-09 2006-06-15 A.O. Smith Corporation Controller for a motor and a method of controlling the motor
US20170248142A1 (en) * 2014-10-15 2017-08-31 Grundfos Holding A/S Method and system for detection of faults in pump assembly via handheld communication device
US20200182684A1 (en) * 2017-04-26 2020-06-11 Augury Systems Ltd. Systems and methods for monitoring of mechanical and electrical machines
EP4024147A1 (fr) * 2021-01-05 2022-07-06 EWA Sensors ApS Dispositif de capteur pour la surveillance de machines rotatives et procédé de surveillance de machines rotatives
WO2023088931A1 (fr) * 2021-11-17 2023-05-25 Grundfos Holding A/S Procédé et appareil de détection de choc hydraulique

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060071666A1 (en) * 1999-09-28 2006-04-06 Reliance Electric Technologies, Llc Detection of pump cavitation/blockage and seal failure via current signature analysis
US20060127227A1 (en) * 2004-04-09 2006-06-15 A.O. Smith Corporation Controller for a motor and a method of controlling the motor
US20170248142A1 (en) * 2014-10-15 2017-08-31 Grundfos Holding A/S Method and system for detection of faults in pump assembly via handheld communication device
US20200182684A1 (en) * 2017-04-26 2020-06-11 Augury Systems Ltd. Systems and methods for monitoring of mechanical and electrical machines
EP4024147A1 (fr) * 2021-01-05 2022-07-06 EWA Sensors ApS Dispositif de capteur pour la surveillance de machines rotatives et procédé de surveillance de machines rotatives
WO2023088931A1 (fr) * 2021-11-17 2023-05-25 Grundfos Holding A/S Procédé et appareil de détection de choc hydraulique

Also Published As

Publication number Publication date
EP4695517A1 (fr) 2026-02-18
DK202300317A1 (en) 2024-10-29
DK181714B1 (en) 2024-10-29

Similar Documents

Publication Publication Date Title
EP3207256B1 (fr) Procédé et système de détection de défauts de pompes par un dispositif de communication portable
JP5819395B2 (ja) 圧力監視によるファンパラメータの決定
CN101636589B (zh) 用于检测泵机组中的故障的方法及检测系统
TWI751170B (zh) 泵總成、分析自經安裝於一泵上之一加速度計接收之資料的方法及電腦程式
CN103133386A (zh) 用于检测旋转失速的方法和装置及压缩机
JP2008544131A (ja) 外部のマイクロホンによるエンジン状態の検知
US10612970B2 (en) Device for measuring dynamic characteristics of centrifugal rotating machine
DK181714B1 (en) System and method for detecting pressure surges
US20250035120A1 (en) Method and apparatus for detecting hydraulic shock
WO2017023360A1 (fr) Système de capteur de vitesse de vibration doppler
US12404860B2 (en) Method and apparatus for detecting hydraulic shock
US10240972B2 (en) Doppler ultrasonic velocity probe
Velarde-Suárez et al. A predictive maintenance procedure using pressure and acceleration signals from a centrifugal fan
US20240118170A1 (en) Vibration monitoring device, turbocharger, and vibration monitoring method
JP7257456B2 (ja) 振動監視装置、過給機、及び振動監視方法
DK181718B1 (en) System and method for detecting direction of rotation
EP3971536B1 (fr) Débitmètre à ultrasons doté d'un mode de fonctionnement résistant aux vibrations
CN121634109A (zh) 转速量测装置及方法

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 24788286

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 2024788286

Country of ref document: EP

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 2024788286

Country of ref document: EP

Effective date: 20251112

ENP Entry into the national phase

Ref document number: 2024788286

Country of ref document: EP

Effective date: 20251112

ENP Entry into the national phase

Ref document number: 2024788286

Country of ref document: EP

Effective date: 20251112

ENP Entry into the national phase

Ref document number: 2024788286

Country of ref document: EP

Effective date: 20251112

ENP Entry into the national phase

Ref document number: 2024788286

Country of ref document: EP

Effective date: 20251112

ENP Entry into the national phase

Ref document number: 2024788286

Country of ref document: EP

Effective date: 20251112

ENP Entry into the national phase

Ref document number: 2024788286

Country of ref document: EP

Effective date: 20251112

ENP Entry into the national phase

Ref document number: 2024788286

Country of ref document: EP

Effective date: 20251112

ENP Entry into the national phase

Ref document number: 2024788286

Country of ref document: EP

Effective date: 20251112

WWP Wipo information: published in national office

Ref document number: 2024788286

Country of ref document: EP