Patent ID: 8727739
Filing Date: 2014-05-20
Classification: A47J,F04B,H05B

Abstract:
1. A liquid pump comprising: a cylinder; an inlet valve for feeding the liquid into the cylinder; a discharge valve for discharging the liquid out of the cylinder; a piston sliding in said cylinder so as to draw said liquid into said cylinder and to expel the same outside the cylinder; an electric circuit for heating the cylinder, wherein said electric circuit has two or more branches, wherein said two or more branches each has at least one resistor for electrically heating the liquid in the cylinder, wherein said resistor is made in the form of an electrically conducting thin track located on or in the wall of the cylinder, wherein said branches occupy different longitudinal portions along said cylinder in order to control the longitudinal portions of the cylinder heated by selecting the branches through which a current passes, and wherein a control circuit is configured to select at least one of the branches to supply with current and simultaneously to select not to supply current to at least another of the branches, depending on a temperature and/or a volume of the liquid in the cylinder.