FR2777046A1 - Lift pump for pumping fluids - Google Patents

Abstract

The pump comprises a tube (1), whose bottom end (11) extends into the water table (E), closed by a non-return valve (12). The tube contains a pumping rod (2) and pumping pistons (21) along its length powered by a motor unit (3). A compensating tube (5) surrounding the exhaust tube (1) connects the top part (51) of the pump to the lower part (52) of the exhaust tube (1) at a zone just above the lowest piston (21A).

Description

The present invention relates to a dewatering pump for pumping

  fluids including water in an underground aquifer, comprising a dewatering tube whose bottom

  immersed in the water table is closed by a check valve

  return, this tube receiving a pumping rod provided with at least

  a pump piston, the rod being actuated according to a movement

  back and forth and the dewatering tube partially opens

  high in a distribution tank.

  A dewatering pump is already known according to the do-

  cument FR 95 10 968 concerning a vertical reciprocating pump

  hold. The present invention aims to develop

  such a pump and improve its operation.

  To this end, the invention relates to a pump of the type defined above, characterized in that it comprises a compensating tube connected in the upper part to the part of the pump and in the lower part to the dewatering tube, above the zone traversed by the lowest piston or piston in case

plurality of pistons.

  The compensating tube which constitutes a column

  water in parallel on the dewatering tube and opens into it

  itself in the lower part, but above the area traversed by the last piston, constitutes a compensator making it possible to work the rod provided with the piston (s) in the

ideal conditions of equilibrium.

  According to another advantageous characteristic, the compensating tube is connected in the upper part to a reservoir

buffer supplied by the pump.

  The buffer tank helps to balance the leaks

  your possible pumping column during the inter-

  Pumping stop valves, if the bottom valve, despite the large column of liquid which presses on it, should leak due to grains of sand or other deposited between the valve and the surface on which it presses. Such a leak, which is generally only temporary since it is again eliminated when the pump is restarted, can thus be compensated to allow the pump

  to operate in good conditions from the start.

  Possible leakage and decrease in water level

  in the buffer tank will then be compensated again for

during pump operation.

  It should be noted that in general in this type of water pump, the flow rate of the pump is always significantly higher than the flow rate of the distribution valve so that the excess water accumulates in the pump tank and, from a certain level, reached by the water in this tank, the water can pass into the buffer tank and there

compensate for the previous loss.

  According to another advantageous characteristic, the compensating tube coaxially surrounds the dewatering tube and is integral with it. The compensator tube and the dewatering tube are made in pieces which screw together

  to the others, which makes it possible to obtain a single set

  connecting the dewatering tube with the compensating tube, for the

  descend into the same borehole, into the water table to be pumped.

  According to another advantageous characteristic, the buffer tank is connected to the distribution tank by

an overflow.

  The present invention will be described below in more detail using the single attached figure

  which is a diagram of the dewatering pump according to the invention.

  An embodiment of a dewatering pump is

  lon the invention consists of a dewatering tube 1 placed in a borehole F arriving in the water table E to be pumped. The bottom 11 of this dewatering tube is provided with a non-return valve 12 and plunges into the water table. The tube 1 houses a pumping rod 2 provided, according to this example, with several pump pistons 21, 21A. The rod 2 is actuated in a back and forth movement (double arrow A), of limited stroke, by a drive mechanism 3 which can be a manual mechanism or a motor mechanism, for example an electric motor

  driven from a battery charged by a solar cell

  laire. In the upper part 13, the dewatering tube 1 opens into

  a distribution tank 4 provided with a tap 41 represented

schematically.

  The pump also comprises a compensator tube connected by its upper part 51 to the outlet of the pump, by means of a buffer tank 6. In the lower part 52, the compensator tube is connected to the dewatering tube 1 by a 5 orifice or communication 521. This placing in communication achieves the balance of pressures in the dewatering tube 1 and in the compensating tube 5. The communication 521, between the lower part 52 of the compensating tube 5 and the dewatering tube 1, is done above zone C which is preferably that

  traversed by the lowest piston 21A carried by the rod 2.

  In the upper part 51, the communication between the compensating tube 5 and the buffer tank 6 is done by a

  line 61 shown diagrammatically.

  Finally, in the upper part of the reservoir 4, there is a

  communication 41 with the buffer tank 6 so as to

  think of the liquid losses in the buffer tank 6, no-

  especially by possible leaks from the valve 12 of the dewatering tube. The additional filling of the tank 6 is

  made by the communication or overflow tube 41 from

  firing from tank 4 when the water level in the distribution tank 4 reaches or exceeds the level of the

communication 41.

Claims (4)

R E V E N D I C A T IONS   1) dewatering pump for pumping fluids, in particular water, into an underground water table, comprising: - a dewatering tube (1), the bottom (11) of which plunges into the water table (E) is closed by a non-return valve (12), this tube (1) receiving a pumping rod (2) provided with at least one pump piston (21), the rod (2) being actuated (3) in a reciprocating motion and come and the tube   dewatering (1) opens at the top (13) into a reservoir   see distribution (4), characterized in that it comprises: - a compensating tube (5) connected in the upper part (41, 51) to   the pump and at the bottom (52) to the dewatering tube (1),   above the area (C) traversed by the single piston or the lowest piston (21A).   2) Pump according to claim 1, characterized in that the compensating tube is connected in the upper part to a tank buffer (6) supplied by the pump.   3) Pump according to claim 1, characterized in that the compensating tube (5) coaxially surrounds the tube   dewatering (1) and become one with it.   4) Pump according to claim 2, characterized in that   the buffer tank (6) is connected to the dispensing tank tion (1) by an overflow (41).