POWERED TURBOPROP ENGINE

Abstract

The invention relates to design and production methods for a rotor which is both a turbine and a propeller having blades that are hollow along the entire length thereof and which lead into peripheral circular chambers that operate as an engine (THRA) that can be powered by working fluids.

Claims

1. Method for designing and building wheels that are simultaneously: a turbine, an impeller with blades that are hollow along the entire length thereof and which lead into peripheral circular chambers that operate as a fuelled engine (THRA), characterised in that for each set of turbine, impeller, and engine, the profiles of the neutral axes of the strips that are mostly portions of circles are built for the inlet to the turbine and for the inlets to the hollow blades of the impellers and their arrival at the chambers, and are individually configured by initially giving values to the basic geometrical elements and are traced according to specific geometrical arrangements on circular plates of differing diameters which are then arranged at different levels of the wheel and are placed at an angle on the same axis independently to one another, wherein the particular arrangement of the basic geometrical elements for each circular plate is obtained by being inscribed within a circle (C1) from the centre (0) of which extends a spoke (R) with a given numerical value that meets the circle (C1) at a preferential point of intersection (A), the circle (C1) is the surface of revolution that is swept by the leading edge of the blade during rotation of the wheel, another numerical value is given to the chord of the arc that is the portion of the circle of the neutral axis of the strip in question, one of the ends of this chord starting from the preferential point of intersection (A) and the other (E) being located inside the circle on an axis that starts from the preferential point of intersection (A) and forms an angle of 45° with the spoke (R), the position chosen for this axis on the right or the left of the spoke determines the desired direction of rotation of the wheel (1 or 2), and there is placed on the spoke towards the centre another point (B) located at a numerical value which is that of the spoke of the circle that surrounds the wheel (C1) minus a numerical value that is the square root of the sum of the squares of two ½ chords (Pythagoras), a straight line with a numerical value identical to that of the chord extends from point (B) such that its midpoint aligns with the midpoint of the chord (M) that is perpendicular thereto and generates a point at its other end (D), the point (B) located on the spoke serves as a centre with a numerical value equal to that of the straight line (A B) for the portion of the circle that stretches between both ends of the chord (A and E) that is the arc thereof and that is the desired circular profile of the strip, and the point (D) located on the other end of the straight line that intersects the chord at its midpoint serves as the centre for tracing the portion of circle that stretches between the two ends of the chord (A and E) which is also the arc thereof and which is the other desired symmetrical circular profile of the strip, characterised in that other centres of circles located on the perpendicular straight line (B D) and that have diameter values greater than or less than the points B and D allow the same to join or not the ends of the straight line (A E) and to generate portions of circles with flatter or more curved profiles (PL1, PL2) but which can also benefit from this method, the portion of the circle (PL2) is not linked to points A and E, the straight line (A E) also being a strip profile that can be used, characterised in that the profiles built with this method and with the same numerical values on each side of the spoke are symmetrical, the mixing of the strip profiles obtained with this method makes it possible, by changing the parameters, to build evolving blades with specific characteristics, characterised in that the numerical values of the profiles of the neutral axes built using this method are mathematically quantifiable, and characterised in that one same wheel may use different turbine strip profiles and profiles of hollow impeller blade strips that are defined using the same method but with different profiles on the same wheel.

2. Method for designing and building THRA wheels according to claim 1, characterised in that the plates receiving the neutral axes' profiles, determined according to the method described in the previous claim, are built with different numerical values of profiles that are associated, mixed, partially overlapping, tangled, concave or convex or joined to one another by the material of the plate, in order to build the strip profiles necessary for the turbo inlet and the hollow impeller blades and the inlet of the peripheral circular chambers, when the hollow blades no longer allow one another to be held in place by the plate material, a ring (C1) being added to fasten them around the outside of the plate (CO), and conversely when the impeller blades do not need to hold one another in place, the plate disappears with the hollows in the blades and only the profiles of the blade strips that are coated in matter remain and are fastened to one another.

3. Method for designing and building THRA wheels according to one of the previous claims, characterised in that the hollows in the impeller blades are intersected by portions of circles that are concentric to the wheel and generate complementary channels inside the hollow impeller blades each leading into an independent circular chamber that surrounds the entire wheel and is preferably provided with spacers and a circular groove with a nozzle-shaped profile.

4. Method for designing and building THRA wheels according to one of the previous claims, characterised in that the channel of the hollow impeller blade receives tubes that originate from the central shaft and continue each inside the hollow blade or the portions of hollow blades until their individual peripheral circular chambers.

5. Method for designing and building THRA wheels according to one of the previous claims, characterised in that a non-rotating peripheral circular chamber is placed with some clearance inside those that do rotate and that this chamber is internally divided into angular sectors that are sealed from one another, each being fed by a channel that comes from a fixed ring that is kept on the shaft by means of a bearing and that redirects the channels towards a central place that allows fluid to be fed towards each sector.

6. Method for designing and building THRA wheels according to one of the previous claims, characterised in that the wheel is built in several parts, a first independent connected assembly is formed by a first plate that joins, with the strips necessary for feeding the turbo, a second plate that has the openings necessary for feeding the hollow impeller blades, a second independent connected assembly is formed by a third plate from which extend only the strips of the hollow impeller blades that will then join a fourth independent plate that receives the strips of the hollow impeller blades with the necessary openings to feed the peripheral circular chambers, a third independent connected assembly is formed by a fifth plateau that caps the assembly of the circular chambers in agreement with the inlets provided by the fourth plateau, with the understanding that the chambers have a very wide range of characteristics and construction choices, other plates may also be placed on demand in between the impeller blades, the rotating or non-rotating chambers are made of pressure- and temperature-resistant materials, either by making the nature of the material evolve progressively if it is sintered or by manufacturing the chambers independently and then arranging them on the corresponding plate.

7. Method for designing and building THRA wheels according to one of claims 1 to 6, characterised in that the plates are not flat discs but preferably curved upwards or downwards in the shape of a semi-spherical or frustoconical bowl, and on which the inlets and outlets of the impeller blades are inscribed as close as possible to their respective plates.

8. Method for designing and building THRA wheels according to claims 1 to 6, characterised in that the inlet surface of the inner channel of the blades is quantified at the level of each plate by using the mathematical geometric methods of claim 1 and in that the inlet surface of each blade depends on the number of blades chosen that cover the surface of the disc swept by the impeller, preferably without the blades overlapping one another, and the length given to the chord contained within the blade and that a surface value equivalent to that of the channel inlet is matched by the outlet of the impeller blade as it penetrates the circular chamber, this surface eventually having a coefficient, and using the same mathematical geometric processes to define this outlet surface, these values then being compared to one another to determine the profile to be given to the internal channel of the blade along its length.

9. Method for designing and building THRA wheels according to one of the previous claims, characterised in that the strip of the bottom surface of the impeller blades is provided by a chord that is no longer at 45° and allows the top and bottom surface strips at the level of the leading and trailing edges at the inlet and outlet of the blade channel to be separated at will, the rigidity of the assembly of the blade strips being guaranteed by profiled and oriented comma-shaped spacers (PL3, PL4) placed between the strips.

10. Method for designing and building THRA wheels according to one of the previous claims, characterised in that the neutral axes are coated in material using the principle that builds the area of a blade using only 5 mathematical values given to portions of geometrical figures that have a centre of reference, and are preferably placed according to or close to values provided by the neutral axes generated according to this method.

Description

DRAWINGS

[0029] These drawings are provided as an example and are outlined and simplified in order to better illustrate the text in the description and claims.

[0030] FIG. 1 shows geometric elements referenced with the letters and numbers used for the Method.

[0031] FIG. 2 shows channels partitioned by portions of circles inside the impeller blades that each end in a chamber and have at the lower part thereof an independent circular chamber fed from a fixed bearing that surrounds the shaft and that receives a fluid.

[0032] FIG. 3 shows a plan view of the fixed partitioned circular chamber that is independent from the other rotating ones that surround it and its feeding through a fixed partitioned bearing chamber.