Patent ID: 9046222
Filing Date: 2015-06-02
Classification: F17D,F23N,G01F

Abstract:
1. A flowmeter comprising: a flow measurement unit that measures a flow volume of fluid flowing through a flow path at a given interval to output flow data; a pressure measurement unit that measures pressure of the fluid to output pressure data; an analysis unit that receives the flow data and the pressure data and analyzes following of a pressure change by a flow volume change, that classifies an amount of flow volume change responsive to an amount of pressure change of a predetermined level or more into at least three ranges by means of a first threshold value and a second threshold value that is smaller than the first threshold value, and that determines a following flow volume change according to determination conditions for the respective ranges of amounts of flow volume changes, wherein the amount of flow volume change indicates a difference between a current flow volume and a past flow volume measured by the flow measurement unit, wherein the past flow volume excludes zero flow at the beginning of the fluid flowing through the flow path; and a processing unit that performs corresponding leakage control of a fluid supply valve according to a determination of a detected flow volume change performed by the analysis unit; wherein the analysis unit determines that the following flow volume change is detected when the amount of flow volume change is the first threshold value or more; determines that the following flow volume change is not detected when the amount of flow volume change is equal to or below the second threshold value; and determines that the following flow volume change is uncertain when the amount of flow volume change ranges between the first threshold value and the second threshold value.