Granted Patent B2

US 12,571,387 · App. 18/229,892 · Granted Mar 10, 2026

Inventors: Hiromitsu Ogawa (Tokyo, JP); Soichiro Konada (Tokyo, JP)

Assignee: Yokogawa Electric Corporation

F04B51/00F04B49/065F04B2205/07F04B2205/503

Abstract

Claims (62)

1 . A detection device for detecting cavitation occurrence in a pump external to the detection device, the detection device comprising a processor configured to:

acquire pressure data indicating pressure of the pump;

calculate a variation coefficient indicating amplitude of pressure magnitude of the pump based on the acquired pressure data;

perform adjustment of detection information which includes the calculated variation coefficient, by using a pressure transmission coefficient representing ease of transmission for pressure of the pump, the detection information being used for cavitation occurrence detection; and

detect cavitation occurrence in the pump based on the adjusted detection information,

wherein the processor is further configured to:

adjust a reference variation coefficient, which is a threshold value to be used for the cavitation occurrence detection, determined in advance and included in the detection information, and thereby calculates an adjusted reference variation coefficient; and

determine that cavitation has occurred in the pump, when the variation coefficient exceeds the adjusted reference variation coefficient.

2 . The detection device according to claim 1 , wherein the processor is further configured to acquire, as pressure of the pump, any one of pump suction pressure, priming water pressure, drain pressure, and discharge pressure.

3 . The detection device according to claim 1 , wherein the processor is further configured to adjust the variation coefficient by using the pressure transmission coefficient, and thereby calculates an adjusted variation coefficient.

4 . The detection device according to claim 3 , wherein the processor is further configured to determine that cavitation has occurred in the pump, when the adjusted variation coefficient exceeds a reference variation coefficient determined in advance and included in the detection information.

5 . The detection device according to claim 1 , the processor is further configured to calculate the pressure transmission coefficient.

6 . The detection device according to claim 5 , wherein the processor is further configured to calculate the pressure transmission coefficient based on pressure of the pump and a state of the cavitation occurrence.

7 . The detection device according to claim 5 , wherein the processor is further configured to calculate the pressure transmission coefficient, by using a relationship between a dynamic pressure obtained from a flow rate of the pump and a static pressure obtained from pressure of the pump, based on the flow rate.

8 . The detection device according to claim 7 , wherein the processor is further configured to calculate the variation coefficient based on the flow rate, by using a relationship between a dynamic pressure obtained from a flow rate of the pump and a static pressure obtained from pressure of the pump.

9 . The detection device according to claim 5 , wherein the processor is further configured to calculate the pressure transmission coefficient based on a relationship between a time from an operate start of the pump to an operate stop and pressure of the pump.

10 . The detection device according to claim 5 , wherein the processor is further configured to calculate the pressure transmission coefficient based on basic information of a fluid sent by the pump.

11 . The detection device according to claim 5 , wherein the processor is further configured to calculate the pressure transmission coefficient based on information of measurement pressure measured by a second pressure gauge disposed farther from the pump than a first pressure gauge that measures pressure of the pump.

12 . A detection method of causing a detection device to:

acquire pressure data indicating pressure of a pump;

calculate a variation coefficient indicating amplitude of pressure magnitude of the pump based on the pressure data acquired;

perform adjustment of detection information which includes the variation coefficient calculated by using a pressure transmission coefficient representing ease of transmission for pressure of the pump, the detection information being used for cavitation occurrence detection; and

detect cavitation occurrence in the pump based on the detection information adjusted,

wherein the method further causes the detection device to:

adjust a reference variation coefficient, which is a threshold value to be used for the cavitation occurrence detection, determined in advance and included in the detection information, and thereby calculates an adjusted reference variation coefficient; and

determine that cavitation has occurred in the pump, when the variation coefficient exceeds the adjusted reference variation coefficient.

13 . A detection system comprising a pressure measurement device and a detection device for detecting cavitation occurrence in a pump external to the detection device, wherein

the pressure measurement device measures pressure of the pump, and generates pressure data indicating a measurement result, and

the detection device includes a processor configured to:

acquire the pressure data from the pressure measurement device;

calculate a variation coefficient indicating amplitude of pressure magnitude of the pump based on the acquired pressure data;

perform adjustment of detection information that includes the calculated variation coefficient, by using a pressure transmission coefficient representing ease of transmission for pressure of the pump, the detection information being used for cavitation occurrence detection; and

detect cavitation occurrence in the pump based on the adjusted detection information,

wherein the processor is further configured to:

adjust a reference variation coefficient, which is a threshold value to be used for the cavitation occurrence detection, determined in advance and included in the detection information, and thereby calculates an adjusted reference variation coefficient; and

determine that cavitation has occurred in the pump, when the variation coefficient exceeds the adjusted reference variation coefficient.

14 . A detection device for detecting cavitation occurrence in a pump external to the detection device, the detection device comprising a processor configured to:

acquire pressure data indicating pressure of the pump;

calculate a variation coefficient indicating amplitude of pressure magnitude of the pump based on the acquired pressure data by using a standard deviation and an average value of the pressure data for a detection target period, the variation coefficient being an index that indicates how much amplitude a fluctuation of the pressure has;

perform adjustment of detection information which includes the calculated variation coefficient, by using a pressure transmission coefficient representing ease of transmission for pressure of the pump in a case of cavitation occurrence, the detection information being used for cavitation occurrence detection; and

detect cavitation occurrence in the pump based on the adjusted detection information,

wherein the processor is further configured to:

adjust the variation coefficient by multiplication with the pressure transmission coefficient, and thereby to calculate an adjusted variation coefficient; and

determine that cavitation has occurred in the pump, when the adjusted variation coefficient exceeds a reference variation coefficient determined in advance and included in the detection information.

15 . A detection method of causing a detection device to:

acquire pressure data indicating pressure of a pump;

calculate a variation coefficient indicating amplitude of pressure magnitude of the pump based on the acquired pressure data by using a standard deviation and an average value of the pressure data for a detection target period, the variation coefficient being an index that indicates how much amplitude a fluctuation of the pressure has;

perform adjustment of detection information which includes the variation coefficient calculated by using a pressure transmission coefficient representing ease of transmission for pressure of the pump in a case of cavitation occurrence, the detection information being used for cavitation occurrence detection; and

detect cavitation occurrence in the pump based on the detection information adjusted,

wherein the method further causes the detection device to:

adjust the variation coefficient by multiplication with the pressure transmission coefficient, and thereby to calculate an adjusted variation coefficient; and

determine that cavitation has occurred in the pump, when the adjusted variation coefficient exceeds a reference variation coefficient determined in advance and included in the detection information.

16 . A detection system comprising a pressure measurement device and a detection device for detecting cavitation occurrence in a pump external to the detection device, wherein

the pressure measurement device measures pressure of the pump, and generates pressure data indicating a measurement result, and

the detection device includes a processor configured to:

acquire the pressure data from the pressure measurement device;

calculate a variation coefficient indicating amplitude of pressure magnitude of the pump based on the acquired pressure data by using a standard deviation and an average value of the pressure data for a detection target period, the variation coefficient being an index that indicates how much amplitude a fluctuation of the pressure has;

perform adjustment of detection information that includes the calculated variation coefficient, by using a pressure transmission coefficient representing ease of transmission for pressure of the pump in a case of cavitation occurrence, the detection information being used for cavitation occurrence detection; and

detect cavitation occurrence in the pump based on the adjusted detection information,

wherein the processor is further configured to:

adjust the variation coefficient by multiplication with the pressure transmission coefficient, and thereby to calculate an adjusted variation coefficient; and

determine that cavitation has occurred in the pump, when the adjusted variation coefficient exceeds a reference variation coefficient determined in advance and included in the detection information.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (15)