Method and system for monitoring a pump

Patent metadata

Field	Value
Publication number	US-11413860-B2
Application number	US-202117220819-A
Country	US
Kind code	B2
Filing date	Apr 1, 2021
Priority date	Apr 2, 2020
Publication date	Aug 16, 2022
Grant date	Aug 16, 2022

Abstract

In a method for monitoring a pump arranged in a flow path to pump a fluid, the temperature of a fluid is regulated by a tempering element during the operation of the pump. The regulation of the temperature may include detecting at least one status point which is formed from an energy supplied to the tempering element and a temperature slope of the tempering element. The status point may be determined in a hazard range by checking whether the status point is located outside of a normal status range, which means that the lifespan of the pump is limited.

First claim

The invention claimed is:

1. A method for monitoring a pump arranged in a flow path and configured to pump a fluid, a temperature of the fluid being regulated by a tempering element during operation of the pump, the method comprising:
detecting at least one status point formed from a tempering energy supplied to the tempering element and an element temperature corresponding to a temperature slope of the tempering element; and
determining whether the at least one status point is situated in a hazard range located outside of a normal status range, wherein the at least one status point being situated in the hazard range is indicative of a lifespan of the pump being limited.

2. The method according to claim 1 , wherein the fluid is tempered in a fluid circuit having at least one input and one output.

3. The method according to claim 2 , wherein the tempering element is a heating element configured to heat the fluid circuit.

4. The method according to claim 1 , wherein the fluid is a liquid printer ink.

5. The method according to claim 1 , wherein an ink printing apparatus includes the pump and the tempering element.

6. The method according to claim 1 , wherein the hazard range is associated with a failure probability.

7. The method according to claim 1 , wherein the normal status range is determined in that a plurality of status points are detected in a learning phase, and a set of the plurality of status points maps to the normal status range.

8. The method according to claim 7 , wherein a predetermined surrounding range is associated with each status point in the learning phase, the predetermined surrounding range being likewise associated with the normal status range.

9. The method according to claim 7 , wherein a range between three respective status points is associated with the normal status range in the learning phase.

10. The method according to claim 7 , wherein the set of the plurality of status points measured in the learning phase is statistically cleaned.

11. The method according to claim 7 , wherein the learning phase is limited chronologically and/or by a predetermined number of measurements of status points.

12. The method according to claim 1 , wherein the normal status range is expanded in response to a status point being measured in a predetermined tolerance environment of the normal status range during a warning phase.

13. The method according to claim 1 , wherein the normal status range is determined via a classification algorithm.

14. The method according to claim 13 , wherein the classification algorithm is a one-class support vector machine (OC-SVM) algorithm.

15. The method according to claim 1 , wherein the status point and the normal status range have one or more auxiliary parameters describing at least one of the following properties:
fluid temperature,
fluid velocity,
fluid density,
fluid pressure,
fluid composition,
ambient temperature,
conduit length, and/or
conduit cross-section.

16. The method according to claim 1 , wherein at least two status points are detected at a predetermined time interval from one another, a time change of the status points being taken into account in the check as to whether the status point is situated in a normal status range.

17. A non-transitory computer-readable storage medium with an executable program stored thereon, that when executed, instructs a processor to perform the method of claim 1 .

18. An ink printing apparatus, comprising:
a pump arranged in a flow path and configured to pump ink; and
a processor configured to regulate a temperature of the ink using a tempering element during operation of the pump, wherein regulation of the temperature includes:
detecting at least one status point formed from a tempering energy supplied to the tempering element and an element temperature corresponding to a temperature slope of the tempering element; and
determining whether the at least one status point is situated in a hazard range located outside of a normal status range, wherein the at least one status point being situated in the hazard range is indicative of a lifespan of the pump being limited.

Assignees

• Canon Production Printing Holding Bv

Inventors

• Wüstner Christoph
• Pichlmeier Robert
• Grossmann Oliver
• Misanovic Stefan
• Bhatt Nimitt

Classifications

• F04C14/28

  Safety arrangements; Monitoring · CPC title

• F04B2205/11

  Outlet temperature · CPC title

• B41J2/04501 Primary

  Control methods or devices therefor, e.g. driver circuits, control circuits · CPC title

• F04C15/0096

  Heating; Cooling (of machines or engines in general F01P) · CPC title

• B41J2/17596

  Ink pumps, ink valves · CPC title