45results about How to "Low critical speed" patented technology

A magnetically-levitated blood pump with an optimization method that enables miniaturization and supercritical operation. The blood pump includes an optimized annular blood gap that increases blood flow and also provides a reduction in bearing stiffness among the permanent magnet bearings. Sensors are configured and placed optimally to provide space savings for the motor and magnet sections of the blood pump. Rotor mass is increased by providing permanent magnet placement deep within the rotor enabled by a draw rod configuration.

A blood pump (1) comprises a pump casing (2) having a blood flow inlet (5) and a blood flow outlet (6) connected by a passage (7), and an impeller (3) arranged in said pump casing (2) so as to be rotatable about an axis of rotation (9). The impeller (3) is provided with blades (4) sized and shaped for conveying blood along the passage (7) from the blood flow inlet (5) to the blood flow outlet (6), and is rotatably supported in the pump casing (2) by a first bearing (10) at a first axial end of the impeller (3) and a second bearing (20) axially spaced apart from the first bearing (10). The first bearing (10) comprises a projection (11) extending along the axis of rotation (9) and connected to one of the impeller (3) and the pump casing (2) and a cavity (13) in the other one of the impeller (3) and the pump casing (2), the projection (11) comprising an enlarged portion (12) that engages the cavity (13) such that the first bearing (10) and the second bearing (20) are arranged to bear axial forces in the same axial direction.

A non-thrust-disc radial and axial integrated permanent magnet biased magnetic bearing comprises a permanent magnet body, a magnetic conducting ring, a radial stator core, radial coils, a rotor core, an annular magnetic pole, an axial stator core, axial coils, a thread ring and a rotating shaft, wherein the permanent magnet is used for providing a biased magnetic field; biased magnetic flux and axial control magnetic flux are transferred through the annular magnetic pole; an annular air gap which is longer than a radial air gap is formed between the annular magnetic pole and the thread ring; the magnetic bearing generates force in a differential manner through four magnetic poles of a radial stator; the magnetic bearing is free of a thrust disc and generates force through the end surface of the thread ring; the thread ring is used for compressing the rotor core. An existing radial and axial integrated magnetic bearing axially generates forces through the thrust disc, thus the outside diameter of a rotor, the linear velocity and the ventilation losses are increased, and the mechanical safety margin and critical speed of rotation of the rotor are reduced. The non-thrust-disc radial and axial integrated permanent magnet biased magnetic bearing can solve the shortage of the existing radial and axial integrated magnetic bearing which axially generates force through the thrust disc; the non-thrust-disc radial and axial integrated permanent magnet biased magnetic bearing has the advantages of reducing the losses, and improving the mechanical safety margin and critical speed of rotation of the rotor.

An improvement for a turbine generator or pump having main bearings separated by a span of shaft and a thrust equalizing mechanism adjacent one of said main bearings, the improvement comprising a stationary length compensator interposed between the thrust equalizing mechanism and its adjacent main bearing to reduce the span between said main bearings. Preferably the length compensator is composed of material that shrinks less than the shaft of the generator, and the height of the length compensator, i.e., the compensating dimension, is selected according to desired thrust equalizing mechanism operating parameters over a temperature range.

An improvement for a turbine generator or pump having main bearings separated by a span of shaft and a thrust equalizing mechanism adjacent one of said main bearings, the improvement comprising a stationary length compensator interposed between the thrust equalizing mechanism and its adjacent main bearing to reduce the span between said main bearings. Preferably the length compensator is composed of material that shrinks less than the shaft of the generator, and the height of the length compensator, i.e., the compensating dimension, is selected according to desired thrust equalizing mechanism operating parameters over a temperature range.

The invention provides a deep-sea submarine mineral collecting device and a mineral collecting method thereof. The device comprises a hydraulic mineral collecting system, a sieving system and a crawler belt walking system, wherein the hydraulic mineral collecting system comprises a hydraulic mineral collecting head, a rotating spiral plate, a water jetting device, a motor, spiral mineral sucking covers, a driven wheel and a mineral collecting head and vehicle body connecting component, the sieving system comprises a rotating screen drum and a mineral outlet, and the crawler belt walking system comprises a crawler belt device. The deep-sea submarine mineral collecting device and the mineral collecting method, provided by the invention, can increase mineral collecting efficiency, efficiently save energy and reduce the damage of a submarine mining process to the surface ecological environment of a sea bed.

The invention discloses an elastic damping support for a motor rotor of an ultracentrifuge, which comprises the structures of O-shaped rubber rings, a high-speed bearing, a supporting seat, the motor rotor, a motor stator and a motor shell, wherein the outer sides of the high-speed bearing at two ends of the rotor are provided with O-shaped rubber ring bases, and the O-shaped rubber rings are arranged between the supporting seat and the O-shaped rubber ring bases. The elastic damping support overcomes the defects that a domestic product has low precision, easy heat generation and short service life, and simultaneously solves the manufacturing difficulty of using metal rings in foreign countries; besides, the operation of the elastic damping support is better than the motor with the foreign metal rings, and the elastic damping support replaces the import and widens the international market.

A transverse swing control method for a wheel-rail low-power bogie is characterized in that spherical positioning seats are respectively mounted on mounting surfaces of inner cavities of lower chordsof central square frames of two side frames which are arranged in parallel on the wheel-rail low-power bogie, the spherical positioning seats are transversely and symmetrically arranged along the sideframes, spherical centers of the spherical positioning seats are positioned in the longitudinal direction of the side frames, namely a central plane along the running direction of a vehicle, and transverse swing of the side frames is controlled by the two spherical positioning seats. Transverse swing of the rail wagon side frames is effectively controlled through the two spherical positioning seats, the positioning reliability is high, and the problem of positioning reliability of a swing device in the prior art can be solved.

The invention provides a load shedding device and method for a fan blade out (FBO) event of an aero-engine. According to the load shedding device and method, when a fusing part of a low-pressure rotoris out of operation under the FBO load effect, the critical rotating speed of the low-pressure rotor can still be adjusted bidirectionally. The load shedding device comprises the fusing part, a fan shaft, two or more sensors and a controller, and the fusing part is arranged on a bearing seat or bearing conical wall of a first bearing; the fan shaft comprises an intelligent telescopic structure; the two or more sensors are used for monitoring dynamic response of the first bearing and a second bearing; and the controller is correlated with the sensors and the intelligent telescopic structure, wherein the sensors detect abnormal dynamic responses of the first bearing and the second bearing and transmit the detected dynamic responses to the controller, the controller sends signals to the intelligent telescopic structure, thus the intelligent telescopic structure can extend and retract in a predetermined range, and the length of the fan shaft is changed.

The invention relates to a method for observing the radial displacement of a rotor of a bearingless flux switching motor based on the sum of space symmetrical winding flux linkage. The method comprises calculating the flux linkage of the phase winding of the bearingless flux switching motor by using the detected voltage and current of the phase winding of the bearingless flux switching motor; calculating the sum of two winding flux linkages with 180 degrees spatial symmetry; Transforming the sum of each pair of winding flux linkages with spatial symmetry in a natural coordinate system to a rectangular [alpha][beta] coordinate; according to the relationship between [alpha][beta] coordinate system flux linkage and rotor radial displacement [detal]x, [detal]y, observing the rotor radial displacement [detal]x, [detal]y is observed. The invention does not increase the manufacturing cost of the motor and the control, the radial displacement of the rotor can be observed by utilizing the winding voltage and the current of the motor and the tangential position angle of the rotor.

The invention discloses an active load reducing device for a sudden load of an aero-engine tester. According to the device, a pneumatic chuck is fixed on the upper surface of a chuck support; a working sleeve at one end of a variable stiffness elastic support is arranged in the inner surface of the pneumatic chuck; a flange at the other end of the variable stiffness elastic support is connected with a simulation tester; a three-jaw chuck at one end face of the pneumatic chuck is in a clamping state when the three-jaw chuck is powered on and is in a release state when the three-jaw chuck is powered off; and the variable rigidity elastic support is clamped by adjusting the distance between chuck jaws. The device disclosed by the invention has the beneficial effects that by utilizing the variable stiffness elastic support, the support stiffness is adaptively changed and the critical rotation speed of a rotor system is significantly changed, thereby reducing an impact load of a blade flying off the rotor system and providing experimental support for the safety design of the rotor system when a sudden imbalance occurs; and the device has the characteristics of low cost, good repeatability and implementation convenience.

The invention discloses a vacuum electric scanning supersonic spray deposition laser additive manufacturing device. The vacuum electric scanning supersonic spray deposition laser additive manufacturing device comprises a forming workbench and a laser spray additive device installed above the workbench, the laser spray additive device comprises a cold spray head, a laser generator and a laser beam control device, the spraying direction of the cold spray head can be adjusted so that sprayed powder particle beams can be scanned on the workbench based on the shape of a part, the laser beam control device is installed at an emitting opening of the laser generator and used for controlling the emitting direction of laser beams, the laser beams and the powder particle beams sprayed by the cold spray head are converged at one point, and the surface of the base body and the powder particles are heated to be in a molten state. According to the device, the part is formed by directionally spraying powder and heating and sintering in real time, layer-by-layer powder laying and sintering are not needed, the forming efficiency is greatly improved, the powder cannot be wasted, the forming cost is reduced, the forming quality consistency is good, the forming quality is improved, the part sintering procedure is simplified, and the sintering efficiency is improved.

The invention provides a method and device for coping with an FBO event and a fan rotor supporting device, and aims to reduce the critical rotating speed of a low-pressure rotor after the FBO event occurs. The device for coping with the FBO event comprises a first connecting part and a second connecting part which are connected between a fan disc and a fan shaft in parallel, the second connecting part is at least partially made of intelligent materials, and when a set first load limit is exceeded, the connecting rigidity of the second connecting part is reduced, and the second connecting part is elongated in the axial direction.