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A rotor for mounting blades thereon to form an impeller rotatable about a main axis thereof. Each of the blades has a mounting portion. The rotor includes primary slots and auxiliary slots, each of the primary slots is adapted for receiving the mounting portion of the blade. The primary and auxiliar

A rotor for mounting blades thereon to form an impeller rotatable about a main axis thereof. Each of the blades has a mounting portion. The rotor includes primary slots and auxiliary slots, each of the primary slots is adapted for receiving the mounting portion of the blade. The primary and auxiliary slots are adapted to change their dimensions during rotation of the impeller due to centrifugal forces and thermal effects caused by the rotation thereof. The change in dimensions is adapted to exert pressure on the mounting portion of the blade to retain it within the primary slot.

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1. A rotor adapted for mounting of a plurality of blades thereon to form an impeller rotatable about a main axis thereof, each of the plurality of blades having a mounting portion, the rotor comprising primary slots and auxiliary slots that are radially deeper than the primary slots, wherein: each o

1. A rotor adapted for mounting of a plurality of blades thereon to form an impeller rotatable about a main axis thereof, each of the plurality of blades having a mounting portion, the rotor comprising primary slots and auxiliary slots that are radially deeper than the primary slots, wherein: each of the primary slots is adapted for receiving the mounting portion of one of blades,the primary and auxiliary slots are adapted to change their dimensions during rotation of the impeller due to centrifugal forces and thermal effects resulting from the rotation, wherein the deeper auxiliary slots change their dimensions to decrease a width of the primary slots and thereby exert pressure on the mounting portion inserted in the primary slot to retain the blade held within the primary slot. 2. The rotor according to claim 1, wherein the rotor further comprises top and bottom inserts adapted to receive therein extensions of the mounting portion of the blade for retention of the blade within the primary slot. 3. The rotor according to claim 1, wherein the rotor is adapted for the mounting of a hub thereon being so mounted as to facilitate further retention of the blades within the primary slots when mounted onto the rotor. 4. The rotor according to claim 3, wherein the hub is of a hyperbolic form adapted to facilitate better air flow about the impeller during the rotation. 5. The rotor according to claim 1, wherein the primary slot further contains an adhesive material introduced therein to retain the blade attached to the impeller. 6. The rotor according to claim 1, wherein each of the primary slots has an extension of length ‘l’ from a perimeter of the rotor towards the main axis, and each of the auxiliary slots has an extension of length ‘L’ from the perimeter of the rotor towards the main axis, such that ‘L’>‘l’. 7. The rotor according to claim 1, wherein the auxiliary slots are disposed on each side of the primary slot and spaced therefrom. 8. The rotor according to claim 1, wherein each of the auxiliary slots has a width which is smaller than that of the primary slot. 9. The rotor according to claim 1, wherein two auxiliary slots are disposed between each two adjacent primary slots, such that one auxiliary slot serves as a right auxiliary slot for one of the primary slots, and the other auxiliary slot serves as a left auxiliary slot for the other primary slot. 10. The rotor according to claim 1, wherein a single auxiliary slot is disposed between each two adjacent primary slots, the auxiliary slot serving both as a left auxiliary slot for one primary slot and a right auxiliary slot for the other primary slot. 11. The rotor according to claim 1, wherein the blades are made of a composite material. 12. The rotor according to claim 11, wherein the blades are of a curved three dimensional shape. 13. The rotor according to claim 12, wherein the curved shape is such that when inserted into the primary slots of the rotor, a three dimensional diffusion channel is formed between each two adjacent blades. 14. The rotor according to claim 2, wherein the mounting portion of the blade further comprises extensions adapted to be received within the inserts of the rotor for further securing of the blade within primary slots. 15. The rotor according to claim 14, wherein the extensions are of rectangular shape. 16. The rotor according to claim 1, wherein during rotation of the impeller the width of the auxiliary slots increases to cause a decrease in the width of the primary slots, thereby exerting pressure on the mounting portion of the blade inserted therein. 17. The mounting arrangement according to claim 1, wherein the rotor is mounted onto the axle with an interference fit. 18. The mounting arrangement according to claim 17, wherein the interference fit is achieved by heating and cooling of the rotor body. 19. A compressor comprising: an impeller rotatable about a main axis, comprising: a plurality of blades, each having a mounting portion, anda rotor having a central axis and a mounting bore, and adapted for mounting of the blades, and comprising primary slots and auxiliary slots that are radially deeper than the primary slots, wherein: each of the primary slots is adapted for receiving the mounting portion of one of the blades,the primary and auxiliary slots are adapted to change their dimensions during rotation of the impeller due to centrifugal forces and thermal effects resulting from the rotation, wherein the deeper auxiliary slots change their dimensions to decrease a width of the primary slots and exert pressure on the mounting portion inserted in the primary slot to retain the blade held within the primary slot, andmounting arrangement for fixedly mounting the rotor thereon, the arrangement comprising:an axle formed with a through-going central bore and a conical nose,a clamping bolt, anda bearing shaft formed with a receiving conical bore and a threaded mounting hole,wherein:the conical nose is adapted to fit into the receiving conical bore,the axle is adapted to receive the clamping bolt within its central hole to be threaded into the mounting hole of the bearing shaft,the conical nose is fixedly clamped to the beating shaft, andthe rotor is mountable on the bearing shaft after blades have been installed thereon to form the impeller, and a driving motor.