Detection apparatus, detection method, and computer readable medium

Abstract

Easily detecting cavitation to occur in a pump. A detection apparatus, a detection method, and a program are provided. The detection apparatus includes: a discharge pressure acquiring unit to acquire discharge pressure data indicating discharge pressure of a pump; and a detector to detect occurrence of cavitation in the pump based on a fluctuation amount of a time waveform of the discharge pressure data during a target detection period. The detector may have: a fluctuation amount calculator to calculate the fluctuation amount of the discharge pressure data during the target detection period; and a determining unit to determine, in response to the calculated fluctuation amount becoming the reference fluctuation amount or more, that cavitation has occurred in the pump.

What is claimed is: 
     
         1 . A detection apparatus comprising:
 a discharge pressure acquiring unit to acquire discharge pressure data indicating discharge pressure of a pump; and   a detector to detect occurrence of cavitation in the pump based on a fluctuation amount of a time waveform of the discharge pressure data during a target detection period.   
     
     
         2 . The detection apparatus according to  claim 1 , wherein the detector has:
 a fluctuation amount calculator to calculate the fluctuation amount of the discharge pressure data during the target detection period; and   a determining unit to determine that cavitation has occurred in the pump, in response to the calculated fluctuation amount becoming reference fluctuation amount or more.   
     
     
         3 . The detection apparatus according to  claim 2 , wherein the fluctuation amount calculator calculates, as the fluctuation amount, difference between reference pressure data and the discharge pressure data during the target detection period. 
     
     
         4 . The detection apparatus according to  claim 3 , wherein the fluctuation amount calculator calculates the difference between the discharge pressure data during the target detection period and the reference pressure data for a time length equal to the target detection period as the fluctuation amount. 
     
     
         5 . The detection apparatus according to  claim 3 , wherein the fluctuation amount calculator uses the discharge pressure data that is acquired by the discharge pressure acquiring unit before the target detection period as the reference pressure data. 
     
     
         6 . The detection apparatus according to  claim 5 , further comprising:
 a suction pressure acquiring unit to acquire suction pressure data showing suction pressure of the pump, wherein
 the fluctuation amount calculator uses as the reference pressure data the discharge pressure data acquired corresponding to timing at which the suction pressure data changes from a value exceeding a threshold value to a value equal to or less than the threshold value. 
   
     
     
         7 . The detection apparatus according to  claim 6 , wherein the fluctuation amount calculator uses the discharge pressure data that is acquired corresponding to a timing at which the suction pressure data changes from being a positive pressure value to a negative pressure value as the reference pressure data. 
     
     
         8 . The detection apparatus according to  claim 6 , wherein the fluctuation amount calculator uses discharge pressure data for a time length equal to the target detection period immediately before the timing as the reference pressure data. 
     
     
         9 . The detection apparatus according to  claim 3 , wherein the fluctuation amount calculator is to,
 relatively shift the reference pressure data to the discharge pressure data during the target detection period, and match a mean value of the reference pressure data with a mean value of the discharge pressure data during the target detection period, and   calculate, as the fluctuation amount, difference between the discharge pressure data and the reference pressure data during the target detection period, of which mean values are matched.   
     
     
         10 . The detection apparatus according to  claim 1 , further comprising:
 a fluctuation amount accumulating unit to calculate a cumulative value of the fluctuation amount; and   a maintenance managing unit to determine at least one of time to maintain and time to replace the pump based on the cumulative value of the fluctuation amount.   
     
     
         11 . A detection apparatus comprising:
 a suction pressure acquiring unit to acquire suction pressure data indicating suction pressure of a pump;   a discharge pressure acquiring unit to acquire discharge pressure data indicating discharge pressure of the pump; and   a detector to detect whether cavitation is occurring in the pump based on the discharge pressure data in response to the suction pressure data becoming a threshold value or less.   
     
     
         12 . The detection apparatus according to  claim 11 , further comprising:
 a predicting unit to predict occurrence of cavitation in the pump in response to the suction pressure data becoming the threshold value or less.   
     
     
         13 . A detection apparatus comprising:
 a discharge pressure acquiring unit to acquire discharge pressure data indicating discharge pressure of a pump; and   a detector to detect occurrence of cavitation in the pump based on difference between the discharge pressure data during a target detection period and the discharge pressure data before the target detection period.   
     
     
         14 . A detection method comprising:
 acquiring discharge pressure data indicating discharge pressure of a pump; and   detecting occurrence of cavitation in the pump based on a fluctuation amount of a time waveform of the discharge pressure data during a target detection period.   
     
     
         15 . A computer readable medium to store a program, the program causing a computer to serve as:
 a discharge pressure acquiring unit to acquire discharge pressure data indicating discharge pressure of a pump; and   a detector to detect occurrence of cavitation in the pump based on a fluctuation amount of a time waveform of the discharge pressure data during a target detection period.   
     
     
         16 . A detection method comprising:
 acquiring suction pressure data indicating suction pressure of a pump;   acquiring discharge pressure data indicating discharge pressure of the pump; and   detecting whether cavitation is occurring in the pump based on the discharge pressure data in response to the suction pressure data becoming a threshold value or less.   
     
     
         17 . A computer readable medium to store a program, the program causing a computer to serve as:
 a suction pressure acquiring unit to acquire suction pressure data indicating suction pressure of a pump;   a discharge pressure acquiring unit to acquire discharge pressure data indicating discharge pressure of the pump; and   a detector to detect whether cavitation is occurring in the pump based on the discharge pressure data in response to the suction pressure data becoming a threshold value or less.   
     
     
         18 . A detection method comprising:
 acquiring discharge pressure data indicating discharge pressure of a pump; and   detecting occurrence of cavitation in the pump based on difference between the discharge pressure data during a target detection period and the discharge pressure data before the target detection period.   
     
     
         19 . A computer readable medium to store a program, the program causing a computer to serve as:
 a discharge pressure acquiring unit to acquire discharge pressure data indicating discharge pressure of a pump; and   a detector to detect occurrence of cavitation in the pump based on difference between the discharge pressure data during a target detection period and the discharge pressure data before the target detection period.