LU85729A1 - MANUAL ACTUATION FOULING PUMP - Google Patents

Description

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Manual action treading pump

The present invention relates to improvements made to a manually operated piston piston pump.

The object of the present invention is to provide a manual treading pump with increased flow for the same effort or with less effort for the same flow compared to the pumps of the aforementioned type known in the prior art.

Another object of the present invention aims to provide a ramming pump with a simplified construction, in particular through the use of a particularly effective non-return valve.

According to the invention, the ramming piston pump comprises an above-ground part constituted by a frame generally affecting the shape of an A, the upper part of which is closed so as to form a housing for the control and transmission members which consist of a lever arm carrying, at its end, a pulley over which passes a cable fixed, on the one hand, to the control linkage of the pump piston and, on the other hand, to a point integral with the frame, so to wrap it at least partially; an immersed part consisting of a cylinder in which slides a piston actuated by the linkage, the piston and the foot of the cylinder being provided with a non-return valve, said cylinder communicating at its upper part, with the discharge conduit.

According to a particularly preferred embodiment of the present invention, the two non-return valves have a substantially conical seat and a closure member whose surface intended for contact with the seat is substantially spherical and is provided with guides substantially parallel to the main axis of the valve so as to guide said shutter member parallel to the axis in a cylindrical housing during shutter movements and opening of the passage.

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Advantageously, said shutter member globally affects the shape of a hemisphere carrying on its spherical surface the guides in the form of circular segments are the outside diameter adapted to the inside diameter of the housing.

The advantage of these non-return valves lies in the fact that they can be housed in the sealing plug or even form this sealing plug.

The advantage of the control and transmission members lies in the fact that for a given movement of the end of the control arm, the piston is moved in the cylinder by a distance double of said movement, thanks to the reduction obtained by the cable passing over a pulley, the piston being lowered under the effect of gravity and the weight of the water column resting on it.

Advantageously, said cable is guided by at least one guide pulley so that it is always substantially arranged along the axis of the cylinder.

According to a preferred embodiment, the piston control linkage is disposed in the delivery duct.

The invention is described in more detail below, with the support of the appended figures in which: - Figure 1 shows a perspective view of the above-ground part of the pump according to the invention; - Figure 2 shows schematically, on a larger scale, the transmission mechanism according to the invention; - Figure 3 shows a schematic sectional view of the submerged pump cylinder and - Figure 4 is a cross-sectional view of the shutter member of the non-return valves - - 3 -. > - Figure 5 is a bottom view of a stop.

The detailed description of preferred embodiments given below is given only by way of nonlimiting example. In the figures, identical reference marks represent identical or analogous elements.

With reference to the figures, the above-ground part 1 is composed of a frame 3 generally affecting the shape of an A, the upper part of which forms a housing 5 which contains the control and transmission members. The frame 3 is advantageously mounted on a concrete base (not shown) by means of bolts, for example arranged in the holes 7 provided for this purpose. In this way, corrosion of the frame is avoided by stagnant water at the foot of it.

The control and transmission members consist of a lever arm 9 which pivots about a pivot axis 11 and which carries, at its inner end, a pulley 13 over which passes a cable 15 which is fixed, on the one hand, at a point secured to the frame 17 and, on the other hand, to the control rod which passes through the discharge duct 19. Said cable 15 is advantageously guided on a second pulley 21 secured to the frame so that the cable always in the axis of the pump piston. The cable advantageously bypasses the pulley 13 with a coating angle of approximately 180 °. In this way, a given movement of the pulley 13 implies a double stroke of the pump piston.

It should be noted that the outside part 1 is of a particularly simple construction which makes the pump, according to the invention, suitable for regions in which the technical capacities are lacking.

The submerged part (Figure 3) consists of a cylinder 25 whose lower end is closed by a non-return valve 27 and whose upper end is connected to the discharge conduit 15, a piston 30 provided with a valve non-return 33 sliding in said cylinder while aspirating

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- 4 - the fluid in the enclosure between the piston 30 and the valve 27 to then discharge into the discharge conduit 15 via the valve 33 opened by the compression of the fluid admitted to the previous cycle.

The piston 30 is provided with at least one seal 31 which is fixed to it by means of a perforated plate 32 and corresponding screws 32 '.

The piston 30 also includes a non-return valve with conical seat 33, the shutter member 34 consists of a hemisphere bearing on its spherical surface 34 ', intended for contact with the conical seat 33 two guides 35 in the form of circular segment whose outside diameter is adapted to the inside diameter of the housing in which they slide to open and close the passage (Figure 4). The opening stroke of the shutter member 34 is advantageously limited by a stop 37 screwed into the hollow of the piston 30 and simultaneously serving as a connection between the rod 39 and said piston 30. Said stop is shown in FIG. 5.

The non-return valve 27 is similar to the previous one, the stroke of the shutter member 28 being limited by a plate 29 allowing the passage of the fluid, such as an annular plate, in the form of a grid or of a form similar to the 'stop 37, tightened on the valve body by screws 29'.

It is obvious that the present invention is not limited to the embodiments described, but that it is defined by the scope of the appended claims.

The pump according to the invention is particularly suitable for the exploitation of groundwater for the supply of drinking water to village communities in the Third World. It is made up of technically simple material and is suitable for use in regions with low technical con craises.

Claims (9)

1. Manually actuated piston pump characterized in that it comprises an above-ground part (1) constituted by a frame (3), generally affecting the shape of an A, the upper part of which is closed so as to form a housing. (3) for the control and transmission members which consist of a lever arm (9) pivoting on a pivot axis (11) and carrying, at its end, a pulley (13) over which passes a cable (15) fixed, on the one hand, to the control rod of the piston of the pump and, on the other hand, to a point (17) integral with the frame (3), so as to envelop it at least partially; and a submerged part consisting of a cylinder (25) in which slides a piston (30) actuated by the linkage, the piston (30) and the foot of the cylinder (27) being provided with a non-return valve (33, 27 ), said cylinder (25) communicating at its upper part with the discharge conduit (19). 2. treading pump according to claim 1, characterized in that the two non-return valves (33, 27) have a substantially conical seat (33 ', 27') and a closure member (34, 28) whose surface intended for contact with the seat (33 ', 27') is substantially spherical and is provided with guides (35) substantially parallel to the main axis of the valve so as to guide said shutter member (34, 28) parallel to the axis in a cylindrical housing during the closing and opening movements of the passage. 3. Pump according to claim 1 or 2, characterized in that said closure member generally affects the shape of a hemisphere carrying on its spherical surface said guides in the form of circular segment whose outer diameter is adapted to the inner diameter of the housing in which they slide. 4. Pump according to any one of the preceding claims, characterized in that the cable (15) is guided by at least one guide pulley - 6 - (21) secured to the frame (3). 5. Pump according to any one of the preceding claims, characterized in that the cable (15) bypasses the pulley (13) at an angle of about 180 °. 6. Pump according to any one of the preceding claims, characterized in that the control linkage passes through the discharge duct (19). 7. Pump according to any one of the preceding claims, characterized in that the piston (30) is provided with at least one seal (31) which is fixed by means of a perforated plate (32) and of corresponding screws (32 '). 8. Pump according to any one of the preceding claims, characterized in that the opening stroke of the shutter member (34) is limited by a stop (37) screwed into the hollow of the piston (30) and serving simultaneously connecting between the rod (39) and said piston (30), said stop allowing the passage of the fluid, however. 9. Pump according to any one of the preceding claims, characterized in that the stroke of the shutter member (28) is limited by a stop (29) in the form of a plate screwed onto the body of the non-return valve ( 27).