Granted Patent B2

US 12,404,860 · App. 18/716,403 · Granted Sep 2, 2025

Inventors: Torben Nielsen (Bjerringbro, DK); Jesper Thørring Damgaard (Bjerringbro, DK)

Assignee: GRUNDFOS HOLDING A/S

F04D15/0088F05D2260/80

Abstract

Claims (17)

1. An apparatus for detecting a hydraulic shock event in a fluid system, the fluid system comprising a pump assembly, the pump assembly comprising a centrifugal pump, and a pump motor, the apparatus comprising means for monitoring a pump speed of the pump and/or means for monitoring a motor frequency of the pump motor; and a processing unit configured to:

detect a variation in the monitored pump speed and/or a variation in the monitored motor frequency; and

detect the hydraulic shock event from the detected variation in the monitored pump speed and/or the detected variation in the monitored motor frequency.

2. The apparatus according to claim 1 , wherein the means for monitoring the motor frequency includes a magnetic field sensor and/or a sensor for measuring a drive current of the motor.

3. The apparatus according to claim 1 , wherein the pump comprises an impeller and a shaft configured to rotationally drive the impeller, and wherein the monitored pump speed is a monitored shaft speed of the shaft.

4. The apparatus according to claim 1 ; further comprising a vibration sensor configured to detect vibrations of a component of the fluid system and wherein the processing unit is configured to:

detect a vibration event; and

detect the hydraulic shock event responsive to the detected vibration event in addition to the detected variation in the monitored pump speed and/or the detected variation in the monitored motor frequency.

5. The apparatus according to claim 4 ; wherein the processing unit is configured to detect the hydraulic shock event responsive to the detected vibration having a predetermined temporal relationship with the detected variation in the monitored pump speed and/or the detected variation in the monitored motor frequency.

6. The apparatus according to claim 4 , wherein the processing unit is configured to detect the vibration event at least by obtaining a vibration signal and by detecting one or more peaks in the vibration signal.

7. The apparatus according to claim 6 , wherein the vibration signal is a vibration velocity signal indicative of a vibration velocity of the one or more components of the fluid system.

8. The apparatus according to claim 6 , wherein the processing unit is configured to classify the detected vibration event as the hydraulic shock event responsive to a magnitude of the one or more of the detected peaks exceeding a threshold, and the one or more of the detected peaks having a predetermined temporal relationship with the detected variation in the monitored pump speed and/or the detected variation in the monitored motor frequency.

9. A computer-implemented method for detecting a hydraulic shock event in a fluid system, the fluid system comprising a pump assembly, the pump assembly comprising a centrifugal pump, and a pump motor, the method comprising:

receiving data indicative of a monitored pump speed of the pump from means for monitoring the pump speed of the pump and/or data indicative of a monitored motor frequency of the pump motor from means for monitoring the motor frequency of the pump motor;

detecting a variation in the monitored pump speed and/or a variation in the monitored motor frequency; and

detecting the hydraulic shock event from the detected variation in the monitored pump speed and/or the detected variation in the monitored motor frequency.

10. A data processing unit configured to perform the computer-implemented method according to claim 9 .

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (26)