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CN-122014641-A - Fire pump system, cavitation monitoring method thereof and storage medium

CN122014641ACN 122014641 ACN122014641 ACN 122014641ACN-122014641-A

Abstract

The invention discloses a fire pump system, a cavitation monitoring method thereof and a storage medium thereof, belonging to the technical field of fire control, wherein the fire pump system comprises a fire pump, an inlet pressure gauge and an outlet pressure gauge are respectively arranged at the inlet and the outlet of the fire pump; the fire control system comprises a fire pump, a water inlet pipe, a water outlet pipe, a port pressure gauge, a control unit and a control unit, wherein the fire pump is connected with a water inlet of the water inlet pipe, the water outlet pipe is connected with the water inlet of the fire pump, the port pressure gauge is arranged at a water inlet port of the water inlet pipe, and the control unit is electrically connected with the port pressure gauge, the inlet pressure gauge and the outlet pressure gauge. The invention solves the problem that the cavitation monitoring and alarming can not be well carried out by combining the specific service scene of the fire pump in the prior art.

Inventors

  • Kang Yinle
  • ZHANG HEHUI
  • LI KANG
  • XIONG JUN
  • GAO JIANMEI
  • ZHOU KUN
  • WU YUXUN

Assignees

  • 湖南凯利特泵业有限公司

Dates

Publication Date
20260512
Application Date
20260415

Claims (10)

  1. 1. A fire pump system, comprising: The fire pump is provided with an inlet pressure gauge and an outlet pressure gauge at the inlet and the outlet respectively; the water inlet pipe is connected with the reservoir and the inlet of the fire pump; The water outlet pipe is connected with the fire pump outlet; The port pressure gauge is arranged at the water inlet port of the water inlet pipe; and the control unit is electrically connected with the port pressure gauge, the inlet pressure gauge and the outlet pressure gauge.
  2. 2. A fire pump system as claimed in claim 1, wherein the inlet pressure gauge and the outlet pressure gauge are mounted at the same height.
  3. 3. The fire pump system of claim 1, wherein the control unit is configured to receive manual information input and output at least one of text, image, and sound.
  4. 4. A fire pump system as in claim 1 wherein the fire pump is a centrifugal pump.
  5. 5. A method for monitoring cavitation of a fire pump system, which is applied to the fire pump system as claimed in any one of claims 1 to 4, and is characterized by comprising the following steps: S1, measuring an initial height difference delta Z 0 between a fire pump and the liquid level of a reservoir before starting the system; s2, at the time t=0 when the system starts, the following operations are performed in real time at each sampling time t=i×Δt: S2.1, measuring port pressure Pa i , inlet pressure Pb i and outlet pressure Pc i ; S2.2, calculating the lift H i =(Pc i -Pb i )/(ρg); S2.3, reversely pushing the flow Q i according to a preset lift-flow relation H=f (Q); S2.4, calculating a real-time height difference Z i =ΔZ 0 +(Pa 0 -Pa i )/(ρg); S2.5, calculating an inlet pipe resistance coefficient k i =(Pa i -Pb i -Z i ρg)/Q i 2 ; S2.6, if k i /k 0 is larger than a preset threshold value, prompting the fault of the inlet pipe; S3, calculating average flow rate Q i-m, i =(Q i-m +Q i-m+1 +…+Q i )/(m+1) based on data of t= (i-m) x deltat to t=i x deltat period, water delivery amount V i-m, i =mΔtQ i-m, i and reservoir sectional area S i-m, i =V i-m, i /(Z i-m -Z i ); s4, for j=1, 2,..each future time t= (i+j) ×Δt time of n, predict height difference Z i+j =Z i +jΔtQ i-m, i /S i-m, i ; S5, substituting the average flow Q i-m, i into a preset flow-necessary cavitation allowance relation NPSH r =g (Q) to obtain a NPSH r predicted value; S6, traversing j=1 to n, and if the minimum j min exists so that the corresponding effective cavitation allowance is smaller than the NPSH r predicted value, triggering cavitation early warning and outputting the occurrence time of the cavitation early warning; Above i, j, m, n is natural number, pa 0 、k 0 is port pressure at starting time, inlet pipe resistance coefficient, Δt is sampling time interval, P atm and P v are standard atmospheric pressure and vaporization pressure of water, ρ is water density, g is gravitational acceleration.
  6. 6. The method of claim 5, wherein if there are multiple solutions in the reverse flow Q i , a solution with a positive value and located in the actual working range of the fire pump is selected.
  7. 7. The method for monitoring cavitation of a fire pump system of claim 5, wherein the predetermined head-flow relationship H=f (Q) is a function of head versus flow fitted according to fire pump manufacturer test data.
  8. 8. A method for monitoring cavitation of a fire pump system as set forth in claim 5, wherein the predetermined flow-required cavitation margin relationship NPSH r =g (Q) is a function of the required cavitation margin fitted to the fire pump manufacturer test data with respect to flow.
  9. 9. A method of monitoring cavitation in a fire pump system as set forth in claim 5 wherein said sampling interval Δt is between 5 seconds and 100 seconds, said m is between 10 and 100, and said n is between 20 and 500.
  10. 10. A computer-readable storage medium storing a computer program, characterized in that the steps of the method for cavitation monitoring of a fire pump system according to any one of claims 5-9 are implemented when the computer program is executed by a processor.

Description

Fire pump system, cavitation monitoring method thereof and storage medium Technical Field The invention relates to the technical field of fire control, in particular to a fire pump system, a cavitation monitoring method thereof and a storage medium. Background The fire pump system is an important fire-fighting infrastructure, and usually adopts a centrifugal pump as core power equipment, absorbs water from a natural water source or a reservoir through a water inlet pipe, is pressurized by a pump body and then is conveyed to a fire-extinguishing site through a water outlet pipe. After the fire pump is started, the running state of the fire pump can be influenced by dynamic changes of external environmental factors, and if faults occur in the middle, the fire pump can seriously threaten the smooth operation of fire extinguishing operation. Therefore, on-line state monitoring and fault early warning of the fire pump system are important. Cavitation is a common risk fault in the operation process of a fire pump, and once cavitation occurs, the flow and the lift of the fire pump are affected, so that a higher risk of impeller damage is caused, and obvious vibration noise is brought. In the prior art, cavitation monitoring and alarming with strong pertinence can not be well carried out by combining a specific service scene of the fire pump. In view of the above, the present invention provides a fire pump system, a cavitation monitoring method thereof and a storage medium for solving the above problems. Disclosure of Invention The invention aims to provide a fire pump system, a cavitation monitoring method thereof and a storage medium thereof, which solve the problem that the cavitation monitoring and alarming cannot be well carried out by combining the specific service scene of a fire pump in the prior art. In order to achieve the above purpose, the present invention provides the following technical solutions: In a first aspect, the present invention provides a fire pump system comprising: The fire pump is provided with an inlet pressure gauge and an outlet pressure gauge at the inlet and the outlet respectively; the water inlet pipe is connected with the reservoir and the inlet of the fire pump; The water outlet pipe is connected with the fire pump outlet; The port pressure gauge is arranged at the water inlet port of the water inlet pipe; and the control unit is electrically connected with the port pressure gauge, the inlet pressure gauge and the outlet pressure gauge. It is further preferred that the inlet pressure gauge and the outlet pressure gauge are mounted at the same height. It is further preferable that the control unit receives manual information input and outputs the information as at least one of text, image, and sound. It is further preferable that the fire pump is a centrifugal pump. In a second aspect, the present invention also provides a method for monitoring cavitation of a fire pump system, which is applied to the fire pump system, and includes the following steps: S1, measuring an initial height difference delta Z 0 between a fire pump and the liquid level of a reservoir before starting the system; s2, at the time t=0 when the system starts, the following operations are performed in real time at each sampling time t=i×Δt: S2.1, measuring port pressure Pa i, inlet pressure Pb i and outlet pressure Pc i; S2.2, calculating the lift H i=(Pci-Pbi)/(ρg); S2.3, reversely pushing the flow Q i according to a preset lift-flow relation H=f (Q); S2.4, calculating a real-time height difference Z i=ΔZ0+(Pa0-Pai)/(ρg); S2.5, calculating an inlet pipe resistance coefficient k i=(Pai-Pbi-Ziρg)/Qi2; S2.6, if k i/k0 is larger than a preset threshold value, prompting the fault of the inlet pipe; S3, calculating average flow rate Q i-m, i=(Qi-m+Qi-m+1+…+Qi)/(m+1) based on data of t= (i-m) x deltat to t=i x deltat period, water delivery amount V i-m, i=mΔtQi-m, i and reservoir sectional area S i-m, i=Vi-m, i/(Zi-m-Zi); s4, for j=1, 2,..each future time t= (i+j) ×Δt time of n, predict height difference Z i+j=Zi+jΔtQi-m, i/Si-m, i; S5, substituting the average flow Q i-m, i into a preset flow-necessary cavitation allowance relation NPSH r =g (Q) to obtain a NPSH r predicted value; S6, traversing j=1 to n, and if the minimum j min exists so that the corresponding effective cavitation allowance is smaller than the NPSH r predicted value, triggering cavitation early warning and outputting the occurrence time of the cavitation early warning; Above i, j, m, n is natural number, pa 0、k0 is port pressure at starting time, inlet pipe resistance coefficient, Δt is sampling time interval, P atm and P v are standard atmospheric pressure and vaporization pressure of water, ρ is water density, g is gravitational acceleration. It is further preferable that if there are multiple solutions in the reverse flow Q i, a solution with a positive value and located in the actual working area of the fire pump is selected. It is further pr