US 11,867,186 B2
Sensor arrangement and method for monitoring a circulation pump system
Michael Helbo Nygaard, Bjerringbro (DK); Flemming Munk, Bjerringbro (DK); and Søren Kjeldsen, Bjerringbro (DK)
Assigned to GRUNDFOS HOLDING A/S, Bjerringbro (DK)
Appl. No. 17/291,144
Filed by GRUNDFOS HOLDING A/S, Bjerringbro (DK)
PCT Filed Oct. 14, 2019, PCT No. PCT/EP2019/077689
§ 371(c)(1), (2) Date May 4, 2021,
PCT Pub. No. WO2020/094334, PCT Pub. Date May 14, 2020.
Claims priority of application No. 18204237 (EP), filed on Nov. 5, 2018.
Prior Publication US 2021/0388837 A1, Dec. 16, 2021
Int. Cl. F04D 15/00 (2006.01); F04D 1/06 (2006.01)
CPC F04D 15/0088 (2013.01) [F04D 1/06 (2013.01)] 27 Claims
OG exemplary drawing
 
1. A sensor arrangement for monitoring a circulation pump system with at least one pump, wherein the sensor arrangement comprises:
a first vibration sensor installed at a first pump part of the at least one pump;
a second vibration sensor installed at a second pump part of said at least one pump, wherein the first pump part and the second pump part have a distance to each other; and
an evaluation module, wherein the evaluation module is configured to discriminate between at least two of k≥2 different types of faults based on comparing first signals received from the first vibration sensor and second signals received from the second vibration sensor, wherein the evaluation module is configured to analyze a time delay between the first signals and the second signals to distinguish between inlet-sided external faults and outlet-sided external faults.