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An apparatus and method for a centrifugal fluid pump for pumping sensitive biological fluids, which includes (i) an integral impeller and rotor which is entirely supported by an integral combination of permanent magnets and electromagnetic bearings and rotated by an integral motor, (ii) a pump housi

An apparatus and method for a centrifugal fluid pump for pumping sensitive biological fluids, which includes (i) an integral impeller and rotor which is entirely supported by an integral combination of permanent magnets and electromagnetic bearings and rotated by an integral motor, (ii) a pump housing and arcuate passages for fluid flow and containment, (iii) a brushless driving motor embedded and integral with the pump housing, (iv) a power supply, and (v) specific electronic sensing of impeller position, velocity or acceleration using a self-sensing method and physiological control algorithm for motor speed and pump performance based upon input from the electromagnetic bearing currents and motor back emf--all fitly joined together to provide efficient, durable and low maintenance pump operation. A specially designed impeller and pump housing provide the mechanism for transport and delivery of fluid through the pump to a pump output port with reduced fluid turbulence.

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An apparatus and method for a centrifugal fluid pump for pumping sensitive biological fluids, which includes (i) an integral impeller and rotor which is entirely supported by an integral combination of permanent magnets and electromagnetic bearings and rotated by an integral motor, (ii) a pump housi

An apparatus and method for a centrifugal fluid pump for pumping sensitive biological fluids, which includes (i) an integral impeller and rotor which is entirely supported by an integral combination of permanent magnets and electromagnetic bearings and rotated by an integral motor, (ii) a pump housing and arcuate passages for fluid flow and containment, (iii) a brushless driving motor embedded and integral with the pump housing, (iv) a power supply, and (v) specific electronic sensing of impeller position, velocity or acceleration using a self-sensing method and physiological control algorithm for motor speed and pump performance based upon input from the electromagnetic bearing currents and motor back emf--all fitly joined together to provide efficient, durable and low maintenance pump operation. A specially designed impeller and pump housing provide the mechanism for transport and delivery of fluid through the pump to a pump output port with reduced fluid turbulence. ding in the disc in a substantially axial direction of the disc; a first stop system including securing parts, the securing parts being at least partially flexible and the securing parts being located between the disc and the blade; and a second stop system including a pair of opposing portions, the opposing portions being separated by an axial clearance, a first one of the opposing portions being provided on the disc, and a second one of the opposing portions being provided on one of the securing parts which is at least partially flexible and which is secured to the disc, wherein when the blade is subjected to a predetermined force, the blade is displaced in the substantially axial direction with respect to the disc, and the securing parts are displaced toward each other until stop surfaces thereof contact each other thereby causing the securing parts to become temporarily deformed and a length of the axial clearance between the opposing portions becomes zero, and wherein when the predetermined force on the blade is stopped, the blade is displaced back to an original position thereof, the securing parts are displaced back to an original position thereof so that the stop surfaces of the securing parts are no longer in contact with each other, and the securing parts are no longer deformed due to the at least partial flexibility of the securing parts. 8. The rotor assembly according to claim 7, wherein one of the securing parts, which is at least partially flexible, is a flange covering a bottom of the blade, and the opposing portions are a hook of the flange and a rim of the disc, the flange comprising a thinned flexible portion located between the hook and a position where the flange is attached to the disc. sing: airfoil pressure and suction sidewalls joined together at leading and trailing edges and extending from a root to tip; a leading edge flow chamber disposed between said sidewalls behind said leading edge, and bounded by a forward bridge extending between said sidewalls; an aft bridge spaced from said forward bridge and extending between said sidewalls; a septum extending chordally between said forward and aft bridges and spaced inboard from said sidewalls to define a first side channel along said pressure sidewall and a second side channel along said suction sidewall; a row of feed holes disposed through said forward bridge in flow communication between said first side channel and said leading edge chamber for channeling a coolant therethrough; and said forward bridge is imperforate between said leading edge chamber and said second side channel. 3. A blade according to claim 2 wherein said septum is disposed near the middle of each of said forward and aft bridges. 4. A blade according to claim 3 wherein said septum is imperforate between said first side channel and said second side channel to isolate said first side channel from said second side channel. 5. A blade according to claim 3 wherein said feed holes face a back side of said leading edge for directing said coolant in impingement thereagainst. 6. A blade according to claim 5 further comprising a row of film cooling holes extending through one of said sidewalls near said leading edge, and disposed in flow communication with said leading edge chamber for discharging said coolant therefrom. 7. A blade according to claim 6 further comprising a row of film cooling gill holes disposed through said suction sidewall in flow communication with said second side channel. 8. A blade according to claim 7 wherein said first and second side channels have respective first and second inlets disposed below said blade root. 9. A blade according to claim 8 further comprising a mid flow channel disposed between said aft bridge and trailing edge, and terminating in flow communication with said second inlet for discharging thereto said coolant. 10. A blade according to claim 9 wherein said mid flow channel is a serpentine flow channel and said second side channel defines a last pass thereof. 11. A blade according to claim 10 further comprising a trailing edge cooling channel disposed between said serpentine channel and said trailing edge. 12. A blade according to claim 11 wherein both said first and second side channels are disposed in flow communication with said serpentine channel for receiving coolant therefrom. 13. A blade according to claim 11 wherein said trailing edge channel is disposed in flow communication with said serpentine channel for receiving coolant therefrom. 14. A blade according to claim 11 wherein said first side channel, serpentine channel, and trailing edge channel have independent inlets. 15. A blade according to claim 14 wherein said inlets of said serpentine channel and trailing edge channel are sized for metering coolant flow therethrough. 16. A blade according to claim 11 wherein said serpentine channel is disposed in flow communication with said first side channel for receiving coolant therefrom. 17. A blade according to claim 16 wherein said trailing edge channel is disposed in flow communication with said serpentine channel for receiving coolant therefrom. 18. A blade according to claim 8 further comprising a tip chamber disposed under said blade tip and extending from said aft bridge to said trailing edge, with said aft bridge including an outlet hole disposed in flow communication between said first side channel and said tip chamber for channeling said coolant thereto. 19. A blade according to claim 18 wherein said outlet hole is sized for metering coolant to said tip chamber. 20. A blade according to claim 19 wherein said tip chamber includes turbulator ribs alternating between a ceiling and floor thereof. 21. A blade according to claim 20 wh erein said tip chamber further includes turbulator pins extending from inner surfaces of said pressure and suction sidewalls. 22. A blade according to claim 21 wherein said turbulator pins are coplanar with respective ones of said turbulator ribs. 23. A turbine blade comprising: airfoil pressure and suction sidewalls joined together at leading and trailing edges and extending from a root to tip; a leading edge flow chamber disposed between said sidewalls behind said leading edge, and bounded by a forward bridge extending between said sidewalls; an aft bridge spaced from said forward bridge and extending between said sidewalls; a septum extending chordally between said forward and aft bridges and spaced inboard from said sidewalls to define a first side channel along said pressure sidewall and a second side channel along said suction sidewall; a row of feed holes disposed through said forward bridge in flow communication between said first side channel and said leading edge chamber for channeling a coolant therethrough; a serpentine mid flow channel disposed between said aft bridge and trailing edge, and terminating in flow communication with said second side channel for a last pass thereof; a trailing edge cooling channel disposed between said serpentine channel and said trailing edge; and a tip chamber disposed under said blade tip and extending from said aft bridge to said trailing edge, with said aft bridge including an outlet hole disposed in flow communication between said first side channel and said tip chamber for channeling said coolant thereto. 24. A blade according to claim 23 wherein said septum is disposed near the middle of each of said forward and aft bridges, and said forward bridge is imperforate between said leading edge chamber and said second side channel. 25. A blade according to claim 24 wherein said feed holes face a back side of said leading edge for directing said coolant in impingement thereagainst, and further comprising: a row of film cooling holes extending through said pressure sidewall near said leading edge, and disposed in flow communication with said leading edge chamber for discharging said coolant therefrom; and a row of film cooling gill holes disposed through said suction sidewall in flow communication with said second side channel. 26. A blade according to claim 25 wherein said first and second side channels have respective first and second inlets disposed below said blade root. 27. A blade according to claim 26 wherein said first side channel, serpentine channel, and trailing edge channel have independent inlets. 28. A blade according to claim 27 wherein said inlets of said serpentine channel and trailing edge channel are sized for metering coolant flow therethrough. 29. A blade according to claim 28 wherein: said second inlet is sized for metering said coolant to said second side channel at a reduced pressure to reduce backflow margin at said gill holes; and said outlet hole is sized for metering coolant to said tip chamber. pressor comprising: a casing (20) which is internally partitioned into a first chamber (71) and a second chamber (72) opposed to each other; a screw type compression section (21) placed in the first chamber (71); a motor section (22) placed in the second chamber (72) and having a motor (23) for driving the compression section (21); a gas passage (45) defined in the first chamber (71) and allowing a gas to flow from an inlet (41) only through the compression section (21) to an outlet (42); a fan (51) driven by the motor (23); and a motor-cooling air passage (54) defined in the second chamber (72) and allowing air blown by the fan (51) to pass only through the motor section (22), wherein: the gas passage (45) and the motor-cooling air passage (54) do not interfere with each other, and a main shaft (25) to which a rotor (27) of the motor (23) is fixed has an extended portion axially extended, and the screw (26) of the compression section (21) is fixed to the extended portion. 4. The screw compressor according to claim 3, wherein the screw (26) of the compression section (21) is a single screw.