HYDRAULICALLY CONTROLLED DIAPHRAGM PUMP COMPRISING A DEDICATED DEGASSING PATH

摘要

The invention relates to a pump comprising a dosage head (1) comprising a first part (2) and a second part (7) in which there is provided a hydraulic chamber (8) which is filled with a fluid and a dosage body (14) comprising means for driving a piston (13) of the pump in translation in the hydraulic chamber, a valve (17) for regularization of pressure in the hydraulic chamber, and at least one degassing path (33, 34, 36, 37) which extends in the second part, such that a first end of the path which forms the lowest point of the said path opens out at a junction between the piston and a seal fitted on the piston, and a second end of the path which forms the highest point of the said path opens out into a hollow body of the said valve.

主权项

1. Hydraulically controlled diaphragm pump comprising:
a dosage head (1; 101) comprising a first part (2; 102) with a pumping chamber (3; 103), and a second part (7; 107) in which there is provided a hydraulic chamber (8; 108) which is filled with a hydraulic control fluid, and is separated from the pumping chamber by a diaphragm (3; 103); a dosage body (14; 114) comprising means for driving a piston (13; 113) of the pump in translation in the hydraulic chamber according to an axis of translation (X); at least one seal (16; 116) arranged on the piston at a junction between the second part and the dosage body; a pressure regularization valve (17; 117) in the vicinity of a highest point of the hydraulic chamber in the position of work of the pump, the valve having a hollow body (25; 125) which is in communication with the hydraulic chamber via a flap valve (24; 124) which opens in the direction of the hydraulic chamber towards the hollow body; degassing means which are dedicated to the fluid, the said means comprising at least one degassing path (33, 34, 36, 37; 133, 134, 136, 137) which extends in the second part in a manner which is non-parallel to the axis of translation, such that a first end of the path which forms the lowest point of the said path opens out at a junction between the piston and the seal, and a second end of the path which forms the highest point of the said path opens out into the valve body above the flap valve.