Modulating liquid pump

Abstract

The present invention relates to a modulating liquid pump. This pump comprises an inlet port for receiving a liquid and an outlet port for delivering said liquid, an electromagnetic pump placed between the inlet port and the outlet port and comprising a piston for pumping said liquid, said modulating pump further including a regulating means, for regulating the pressure of the liquid. This pump is noteworthy in that said regulating means is of the electric type and is capable of regulating the travel of said piston according to an electrical setpoint signal (Vc). Application to fuel oil burners.

1 . Modulating liquid pump ( 2 ) comprising an inlet port ( 4 ) receiving a liquid and an outlet port ( 6 ) for delivering said liquid, an electromagnetic pump ( 12 ) arranged between the inlet port and the outlet port and comprising a piston ( 18 ) for pumping said liquid, said modulating pump comprising a means of regulating ( 28 ) the pressure of the liquid, characterised in that said regulating means ( 28 ) is of the electric type and is capable of regulating the travel of said piston ( 18 ) according to an electrical setpoint signal (Vc). 
     
     
         2 . Modulating pump of  claim 1 , characterised in that the travel of the piston ( 18 ) is controlled by the voltage level of the electrical setpoint signal (Vc). 
     
     
         3 . Modulating pump as claimed in one of the preceding claims, characterised in that the regulating means ( 28 ) is designed to apply a modulated electrical voltage signal to an excitation winding ( 14 ) of the electromagnetic pump ( 12 ). 
     
     
         4 . Modulating pump of  claim 3 , characterised in that the regulating means ( 28 ) is designed to receive an alternating electrical voltage signal and comprises a means of rectifying ( 30 ) this signal. 
     
     
         5 . Modulating pump as claimed in one of  claims 3  or  4 , characterised in that the regulating means ( 28 ) is capable of receiving an alternating electrical signal at a frequency of 50 Hz or 60 Hz. 
     
     
         6 . Modulating pump as claimed in one of the preceding claims, characterised in that it comprises an anti-backflow device ( 24 ,  26 ) for the liquid between the inlet port and the outlet port. 
     
     
         7 . Modulating pump of  claim 6 , characterised in that the anti-backflow device includes an intake valve ( 24 ) arranged upstream from the piston ( 18 ) of the electromagnetic pump ( 12 ) and a discharge valve ( 26 ) arranged downstream from the piston ( 18 ) of the electromagnetic pump ( 12 ). 
     
     
         8 . Modulating pump as claimed in one of the preceding claims, characterised in that it includes an additional pumping means ( 32 ) arranged between the inlet port ( 4 ) and the electromagnetic pump ( 12 ). 
     
     
         9 . Modulating pump of  claim 10 , characterised in that the additional pumping means is of the gear pump type. 
     
     
         10 . Pump as claimed in one of the preceding claims, characterised in that it includes a means of regulating ( 34 ,  36 ) the minimum pressure and/or the maximum pressure of the liquid.