Nowadays, however, there are a great number of turbine type, rotary pumps (for draining, mud and sanitary purposes) , the 10 most used are of the reciprocal type (with pistons) and the centrifugal type. As for the capacity, measured quantity of liquids in a determinated space of time, both types are lim¬ ited.

Pumps of the reciprocal type are operating in the alternative 15 way with the known inconvinience of vibration at the operating frequency and twice as much; these vibrations must be elimi¬ nated as much as possible through a careful equilibration wich represents a loss of output. Further on, the motion of pistons and rods needs considerable energy, reducing the op- 20 erational speed of the pump. When, "using a reciprocal pump we want to raise the capacity, there will be needed several pistons wich raises the weight and volume of the pump. The . greatest inconvinience is the quick worn off of the packing of pistons, usually of leather, representing a loss of work- 25 ing time and additional expenses. Another disadvantage is an insufficient and inadequade lubrification of the ball bear¬ ing of the main axis and rods, causing a quick worn off of ball bearings.Generally, the reciprocal pumps motivated by the fluid oscillating motion are of no great output and are 30 using greater quantity of energy. On the contrary, they have the advantage of operate under high pressure of outflow. The centrifugal pumps of volute or diffuser type are of sim¬ pler construction as the reciprocal ones, but they are oper¬ ating with smaller pressure of outflow. The circular trajec- 35 tory of liquid in these pumps results in loss of energy and the small internal diameter of the pump results in a reduced amount of fluids crossing the pump of great volume; if great amount of fluids are needed, the volume of the pump would

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reach an oversized structure. The centrifugal pumps are inad¬ equate for operations with liquids of great viscosity, curb¬ ing the motion of the pump and reducing to almost nothing the centrifugal force. As for the quick worn off, packings must be replaced constantly. In the case of centrifugal pumps the problem of high efficiency against maintenance expenses is essential and under circunstances the high efficiency is not justifiable. The centrifugal pumps according to specific speed, rotation speed of a rotor geometrically similar oper- ating to discharge one gallon of liquid per minute to a dif¬ ference of quote of one foot, are bound to cavitation. The pumps with propeller blades existing and, they are al¬ ready known and the difference of quotes in the transport of liquids is normally compensated through the propelling motion of propeller blades; usually the specific speeds are higher in relation to the former pumps and the dimensions are smaller than the said types. However, they have the disadvantage that the operating differences quotes are smaller (half as much or less) than the one of a centrifugal pump. It results of the fact that the enter of the fluid axially is not discharged in the same way in the guide boxes, resulting in loss of ^" energy. In the present stage, the centrifugal pumps have a better ef¬ ficiency as the pumps with propeller blades. Even using ad¬ justable propeller blades to prevent an excessive surcharge of the common motor, the actual pumps with propeller blades are used in groups but the obtained elevations of the liquids are small degree.

To consider these facts, it was developed the pump with pro¬ peller blades and directional plates, object of the present Petition of Privilege of Patent that aims to eliminate some of the described inconviniences through the introduction of directional plates to orient the liquid in the right directicn, obtaining a directed flow, avoiding loss of energy and re¬ sulting in a higher working capacity. The figure of the drawing sheet attached to this present re¬ port shows a schematic longitudinal section of the propose new pump. The design gives in details, the sucking inlet (1) of the

liquid', the longitudinal axis (2) , on wich is fixed a rotato¬ ry propeller (3) , with directional plates (4) before and af¬ ter the propeller containing a fixed propeller; furthermore _- the figure shows the outlet (5) of discharge, retainers (6) , 5 ball bearings (7) , pump cover (8) , fixing cover (9) of ball bearings (7) and in traced lines, additional directional plates (10) in case of necessity to improve the efficiency of the pump.

The aspirated liquid through the inlet (1) is forced by the 10 propeller (3) in the direction of the outlet (5) . The propeller alone (3) has a low efficiency because it makes rotate the liquid in the chamber propelling only a part of the fluid; through the introduction of directional plates (4) before and after the propeller (3) the efficiency is improved by elimi- 15 nating the circular movement of the liquid in the chamber of the pump, directing the total flow of the liquid _* The direc¬ tional plates (4) must be mounted in reversed angles of the propeller (3) or of the plates (4) must be measured in accord¬ ance with the required capacity and pressure in the pump.Small 20 angles with result in smaller volume of outlet but in higher pressure, and greater angles will have the opposite result. In accordance with the utilization's necessities, it'll be mounted a lot of conjucts of propeller and directional plates, having to increase at the same time the feeder motor power.If 25 there will not be a circular or a oscillatory moviment of the liquid, the propulsion power is used in the maximum, because the liquid has the trajectory impost by the directional plates (4) .

The pump with propeller blades and directional plates is espe- 30 cially useful for viscous liquids, as the plates (4) pass over * the liquid serving as knives during the propulsion. The pump i under high pressure can be used for propelling vessels;in this case the setting on the vessel can be external and internal. The internal setting is recomended for vessels for navigation 35 in not much deep waters where the conventional external pro¬ pellers stay fang to the water bed. Eventual repairworks would be turned much easier. It must be further indicated that the prototype of the proposed

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pump was tested with very satisfactory results, using motors

2 of small power and outlet pressure of 2 Kgpower/cm .

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