초록 ▼

In the method of the invention, from a measured effective pressure difference .DELTA.p.sup.M.sub.w a flow rate V is determined and from that, via an operational characteristic curve a target value for the total pressure difference .DELTA.p.sup.s.sub.t is found. By comparing the target value .DELTA.p

In the method of the invention, from a measured effective pressure difference .DELTA.p.sup.M.sub.w a flow rate V is determined and from that, via an operational characteristic curve a target value for the total pressure difference .DELTA.p.sup.s.sub.t is found. By comparing the target value .DELTA.p.sup.s.sub.t determined this way with its measured value .DELTA.p.sup.M.sub.t the operating level and its accuracy are determined. For this purpose on the fan of the invention measuring points are provided for measuring one or more effective pressure differences .DELTA.p.sup.M.sub.w and the total pressure difference .DELTA.p.sup.M.sub.t.

대표청구항 ▼

[ What is claimed is:] [1.]1. A method of determining an operating level of a fan having an inlet nozzle, comprising the steps of:a) measuring an effective pressure difference .DELTA.p.sup.M.sub.w between two planes in the inlet nozzle or between a plane in the inlet nozzle and a location in the sur

[ What is claimed is:] [1.]1. A method of determining an operating level of a fan having an inlet nozzle, comprising the steps of:a) measuring an effective pressure difference .DELTA.p.sup.M.sub.w between two planes in the inlet nozzle or between a plane in the inlet nozzle and a location in the surroundings, a total pressure difference .DELTA.p.sup.M.sub.t between an intake side and a pressure side of the fan, and a shaft power P.sup.M.sub.w of a shaft driving the fan;b) determining from the effective pressure difference .DELTA.p.sup.M.sub.w the flow rate V by the relationshipwhere .alpha. is a nozzle coefficient, A is a cross sectional area of the nozzle and .rho. is the density of gas displaced by the fan;c) comparing a target value of the total pressure difference .DELTA.p.sup.s.sub.t found from the flow rate V via an operational characteristic curve .DELTA.p.sub.t (V) with the measured total pressure difference .DELTA.p.sup.M.sub.t ;d) comparing a target value P.sup.s.sub.w for the shaft power found from the flow rate V via an operational characteristic curve P.sub.w (V with the measured power P.sup.M.sub.w ; ande) from the comparisons c) and d) establishing an operating level of the fan and a degree of accuracy of the operating level. [9.]9. A fan for the determination of its operating level and of a value of currently existing conditions, comprising a motor, a fan wheel, a housing, an inlet nozzle which is provided with at least one measuring point for measuring an effective pressure difference .DELTA.p.sup.M.sub.w and with a thereto connected device for processing the measured values, whereinfor measuring one or more effective pressure differences .DELTA.p.sup.M.sub.w,the inlet nozzle has at least one pressure measuring points in at least two planes (A1 and/or A2, A3) perpendicular to the flow direction, whereby the pressure measuring points of one plane (A1, A2, A3) are interconnected, and the pressure measuring point or pressuring measuring points of two planes (A1 and/or A2, A3) are connected to a pressure sensor (30), orthe inlet nozzle has one or more pressure measuring points in at least one plane perpendicular to the flow direction and in one location in the surroundings a pressure measuring point is arranged, whereby the pressure measuring points of one plane are interconnected, and the pressure measuring point or pressure measuring points of a plane and the pressure measuring point in the surroundings are connected to a pressure sensorfor the purpose of measuring a total pressure different .DELTA.p.sup.M.sub.t a fan housing has several pressure measuring points in the vicinity of its discharge opening in a plane (A4) perpendicular to the blowout direction (26), whereby the pressure measuring points are interconnected, and the pressure measuring point or pressure measuring points are connected to a pressure sensor (30) connected to the pressure measuring points of the inlet nozzle of one of planes (A1 or A2, A3);and for the purpose of measuring a shaft power P.sup.M.sub.w a power measuring device is arranged on the fan.10. A fan according to claim 9, further comprising a rotational speed meter (36) for measuring the motor speed n, a temperature sensor (35) in the inlet nozzle for measuring the temperature T and an absolute pressure sensor for measuring the surrounding pressure Pa.11. A fan according to one of claim 9 wherein the inlet nozzle has in a further plane (A2) one or more pressure measuring points which are interconnected and are connected to a pressure sensor (30) connected to the pressure measuring points of the planes (A1, A3) of the inlet nozzle.12. A fan according to one of claim 9 wherein in each of the planes (A1 to A4) of the inlet nozzle and the housing four evenly distributed pressure measuring points are arranged.13. A fan according to one of claim 9 wherein in the center of each of the planes (A1, A2 or A3) with pressure measuring points, a static pressure sampling location (37) is provided.