Anlage mit mindestens einer Flüssigkeitspumpe

摘要

The invention relates to an installation with at least one liquid pump, especially water pump, preferably centrifugal pump, having an electric drive motor which is connected to a speed controller which is indirectly connected to the secondary distribution system. The main aspect of the invention is that there is connected to the secondary distribution system (N), especially directly, a mechanical or electronic two-point pressure controller or pressure limit value switch or electronic trigger (7), which can be switched on and off as a function of the pressure in the secondary consumer network and which communicates with an upwardly and downwardly adjustable speed controller (3) which can be switched on and off thereby. By means of said speed controller, when it is switched on, the motor and pump speed can be slowly or gradually raised to an upper limit (a) of the secondary distribution network pressure, as a result of which the delivery rate (Q) of the pump can similarly be raised slowly or gradually to an upper limit, and when it is switched off, the abovementioned speeds can be slowly or gradually reduced to a lower limit (b) of the secondary distribution network pressure, as a result of which the delivery rate (Q) of the pump can similarly be reduced slowly or gradually to a lower limit (mVe), and, if an upper limit (a) of the secondary distribution network pressure applies at the same time, the motor and pump speed can be reduced down to the standstill of motor and pump only if consumption is close to zero (Fig. 6, Fig. 7). Thus the complicated and expensive use of P, PI and PID controllers can be avoided. Moreover, according to the invention, the energy consumption and the wear and tear of drive motor and pump can be reduced.