66results about How to "Reduce axial thrust" patented technology

The invention relates to a low-flow resistance rotor with self-cleaning function and heat transfer enhancement used in a heat transfer tube, which comprises a plurality of rotors, supporting frames and a connecting shaft line. The supporting frames are fixed at the two ends of the heat transfer tube. The two ends of the connecting shaft line are fixed on the supporting frames respectively. The plurality of rotors are skewered on the connecting shaft line between the two supporting frames. The rotor consists of a hollow shaft and fins, wherein the hollow shaft is provided thereon with one and more fin(s), each fin is oblique to the central line of the hollow shaft, the working surface of each fin is swirl or flat or a combination thereof, and the fins are fixed uniformly on the outer surface of the hollowing shaft. In the inventive technical proposal, a fluid inside a tube can drive the rotor by the fins to rotate at a proper speed, so as to inhibit and eliminate the deposition of dirt, the fins can disturb the fluid inside the tube to enhance the convection heat transfer, the rotor occupies a small area inside the heat transfer tube to increase the axial flow area and reduce the blockage rate and flow resistance in the heat transfer tube, and the service life of the rotor is significantly prolonged.

A rotating machinery equipment is disclosed, comprising a rotating electrical machine having a stator and a rotating shaft, whereon a rotor is mounted. The machinery equipment further comprises a cooling fan comprised of a rotating impeller mounted on the rotating shaft for co-rotation therewith. Cooling gas passages are provided for delivering compressed cooling gas through the stator and rotor. The cooling gas is delivered by the impeller into a cooling-gas distribution chamber. The pressure of the cooling gas in the cooling-gas distribution chamber generates an axial force balancing the axial thrust generated on the electrical machine by the cooling gas flow.

The invention relates to a vectored thrust ducted propeller. The vectored thrust ducted propeller comprises a screw propeller and a duct cylinder body, wherein the screw propeller can rotate to generate air currents and the duct cylinder body surrounds the screw propeller; a first rotating piece, a second rotating piece and a blocking piece which are arranged in an air current deflection mechanism are respectively and directly derived from a part of a duct body; a complete duct is jointly formed by the first rotating piece, the second rotating piece, the blocking piece and the duct cylinder body part. Under the driving of a speed reducing motor, a rotation driving shaft is rotated, so that the first rotating piece and the second rotating piece are driven to rotate to expected positions; the blocking piece moves forward and backward along a sliding groove formed in the duct cylinder body to prevent the air currents from flowing out of the right side of the duct, and the blocking piece is matched with the first rotating piece and the second rotating piece so that the air currents can flow out of the remained empty part formed after the first rotating piece is rotated; therefore, the whole system bears lateral force which is reversed to the air currents. According to the vectored thrust ducted propeller disclosed by the invention, the thrust direction of a ducted fan is substantially changed, large enough lateral force is provided for an aircraft to balance the reaction torque of a main rotor, so that the residual thrust in the axial direction of the aircraft is as small as possible, and more suitable for the aircraft of the type to ascend and descend perpendicularly and hang in the air.

The present invention provides a main decelerate device which includes a planet gear load-uniformed mechanism, a driver gear and a initiative bevel gear driven by the device, a driven bevel gear engaged with the initiative bevel gear and a speed differientiator connected to the driven bevel gear. It is characterized in that one of the sun gear in the planet gear load-uniformed mechanism is connected to the initiative bevel gear, another sun gear is connected to one of two engaged intermediate drive gears by an axle sleeve, another intermediate drive gear is connected to a secondary initiative bevel gear, the initiative bevel gear and the secondary initiative bevel gear are both connected to a driven bevel gear with double cog. The device divides the power into two parallel path powers with reverse rotate direction and equal torsion, and then combines the two powers into one power by making the main, secondary initiative bevel gears engage with the driven bevel gear with double cog, and passes the power to the speed differientiator by the driven bevel gear and output the power by an axle shaft gear, thereby complete the power output between interleaving shafts, conquers the axial direction offset of the driven bevel gear and increases the drive ability by times.

The invention discloses a dry gas sealing device suitable for a supercritical working medium. Two-stage level dry gas seal is composed of a static ring-moving ring-static ring structure. The sealed supercritical working medium flows through, in the radial direction, a first-stage dry gas seal, and then flows through, in the radial direction, the flow channel between the moving ring and a cavity wall, and then flows through a second-stage dry gas seal. Divergent clearance is adopted in the first-stage dry gas seal, cooling channels are separately arranged on the two static rings, and a heat transfer enhancement structure is arranged on the cavity wall to reduce the end face temperature of a sealing ring. The sealed supercritical working medium is subjected to two-stage level dry gas seal, the leakage rate is greatly reduced, and the sealing performance is good. The dry gas sealing device suitable for the supercritical working medium has the remarkable advantages of reducing the temperature of the sealing ring, reducing the leakage rate and ensuring the sealing performance, and has broad market prospect.

The invention provides a variable-pitch control method for improving weak wind generating capacity of a wind turbine generator. According to the variable-pitch control method, the generating capacity is improved by advancing the pitch angle action in a constant minimum rotation speed region, the constant minimum rotation speed region where the generating capacity is improved is described through a wind speed interval, wherein the wind speed interval means the weak wind speed interval between the cut-in wind speed and the start wind speed of a maximum power point tracking (MPPT) segment. According to the variable-pitch control method, the generating capacity in the wind speed interval [Vcutin, vl] is improved based on the prior art, only an existing variable-pitch control strategy needs to be modified properly, no extra hardware device is needed, and the waving torque and axial thrust of blade roots can be lowered to a certain degree.

The invention discloses a propylene compressor. The propylene compressor is mainly composed of a stator set, a rotor set, a bearing set, a dry gas seal and the like, and is characterized in that (1) the compressor adopts a single-shaft multi-stage centrifugal type, and a single-cylinder three-stage mode is adopted, and the number of the stages are six total; (2) impellers are forged, milled and welded through ternary and binary closed type; (3) medium gas sealing is carried out on two shaft ends by adopting shaft end sealing and series dry gas sealing; (4) a unit adopts a split base, a compressor body and a prime mover have independent bases, and the compressor body is connected with the prime mover through a diaphragm coupling; (5) a shell of the compressor body is divided into an upper body and a lower body from the horizontal plane of a rotating shaft, and the rotating shaft is arranged on the lower shell; (6) the compressor body is provided with three air inlet air ducts and one air outlet air duct; (7) the number of the compressor impellers is six, the diameter of each impeller is 800 mm, the impellers are arranged on a main shaft in sequence, and a balance disc is arranged onthe high-pressure side; and (8) a tilting-pad bearing is adopted as a supporting bearing, the structures same on the two sides are adopted on the two sides of the main shaft, and a thrust bearing isa Kingsbury or Michell bearing.

The invention discloses a two-stage cantilever type axial flow expander, which includes a first-stage expander, a second-stage expander and a motor; the first-stage expander includes an air intake casing, a first-stage nozzle ring and a second-stage expander. The first-stage rotor impeller; the second expander includes the outer casing of the unit, the second-stage nozzle ring, and the second-stage rotor impeller; the motor includes a motor rotor and stator windings; the air inlet casing is arranged opposite to the outer casing of the unit A cavity is formed, the motor rotor is arranged in the cavity along the axis of the cavity, and the motor rotor is provided with an auxiliary thrust bearing shell, a motor shell, and a second The second-stage guide housing, the motor rotor is coaxially provided with a first-stage input end near the end face of the intake shell, and the second-stage input end is coaxially provided with the end face of the motor rotor near the outer shell of the unit. The invention utilizes the two-stage axial flow, which can effectively reduce the rotating speed of the expander, improve the reliability and efficiency of the motor and the frequency converter, and obtain a higher energy conversion rate.

The invention relates to a centrifugal compressor for a gasoline and diesel oil hydrogenating and upgrading device. The centrifugal compressor for the gasoline and diesel oil hydrogenating and upgrading device comprises four parts of a stator group part, a rotor group part, a bearing group part and dry gas seals. The centrifugal compressor for the gasoline and diesel oil hydrogenating and upgrading device is characterized in that (1) a vertical partition structure is adopted in the compressor; (2) partition plates are assembled together to form a partition bundle, and vaneless diffusers are adopted in diffusers between the partition plates and the partition plates; (3) the arrangement form of impellers on a main shaft is in a straight row, the number of the impellers is six to eight, and the diameter is 400mm; (4) between the two adjacent impellers, blades of the latter impeller are arranged to deflect at a certain angle relative to the blades of the previous impeller; (5) a tilting pad bearing is adopted in a supporting bearing adopts; (6) a kingsbury type structure is adopted by a thrust bearing, and a same structure is adopted by the two sides of the thrust bearing; and (7) thedry gas seals are installed at both ends of the compressor, and independent control systems are arranged on the dry gas seals. The centrifugal compressor is particularly suitable for the application of a gasoline and diesel oil hydrogenating and upgrading process.

The invention discloses a swing arm rotation type compressor which comprises a housing, a main shaft and an air guide pipe for communicating a two-stage compression chamber with an air inlet cavity or an air outlet cavity of a rotary valve, wherein the upper end surface of the housing is covered with an upper bearing sealing seat with a gland; an eccentric shaft section is formed in the middle of the main shaft; the inner circle of a rotary sleeve arranged in an inner cavity of the housing is connected with the eccentric shaft section of the main shaft through a sleeve bearing; the main shaft on the upper side and the lower side of the rotary sleeve is connected with the upper bearing seat and the housing through a pair of upper and lower rolling bearings; the rotary valve with the air inlet cavity and the air outlet cavity is arranged on the main shaft on the outer side of the upper bearing; the rotary valve is axially fixed by a locking nut through a valve plate and a gasket; an air inlet connector communicated with the air inlet cavity of the rotary valve and an air outlet connector communicated with the air outlet cavity of the rotary valve are arranged on the outer wall of the upper bearing seat; multiple sets of swing arm mechanisms contacted with the outer circle of the rotary sleeve are arranged along the inner circumferential direction of the housing; and the swing arm mechanisms, the housing, the rotary sleeve and the upper bearing seat form the two-stage compression chamber. According to the swing arm rotation type compressor, the functions of air suction, compression, air discharge and residual air expansion can be effectively achieved, multiple times of sequential compression operation can be finished by rotating the main shaft for a circle, the two-stage compression operation can be performed in each compression process, and the compressor is very small in frictional loss between moving parts, energy-saving, efficient and wide in application range.

The invention discloses a cutter head of a shield machine with a rear center knife. Its technical proposal is that the center knife in front of the traditional cutter head is removed, and a round hole is opened in the center of the cutter head through the cutter head, and the center knife is fixed by the tool holder. behind the round hole. The minimum distance between the center knife edge and the rear end face of the circular hole is not less than half of the radius of the circular hole. When the cutter head is working, the soil outside the central circular hole of the cutter head is first excavated by an ordinary excavating knife, and the soil in the central circular hole of the cutter head forms a soil cylinder and gradually passes through the circular hole. When the soil column hits the rear center cutter, because the confining soil without the surrounding soil is in a unidirectional compression state, it can be broken with only a small axial thrust. Therefore, the cutter head of the shield machine with the center knife behind can greatly reduce the axial thrust of the center knife, thereby reducing the total axial thrust, avoiding the phenomenon of soil cake during excavation, and improving the excavation efficiency.

The invention relates to a spindle force balancing assembly of a friction welding machine. The assembly comprises a spindle and a spindle box and further comprises a balancing device which is assembled on the spindle box and used for exerting axial force on the spindle; and the direction of the force exerted on the spindle by the balancing device is opposite to that of the axial force on the spindle during working. After the balancing device is added, the axial force exerted on the spindle by the balancing device can partially or completely offset the axial force on the spindle during working, so that the axial force on a bearing of the spindle is reduced, and correspondingly, the axial thrust capable of being borne by the friction welding machine is remarkably increased; and meanwhile, the axial force on the spindle is remarkably reduced, and the service life of the bearing of the spindle is correspondingly prolonged. The invention further discloses the friction welding machine provided with the spindle force balancing assembly.

The invention belongs to the technical field of combined heat and power generation steam turbine power generation, and particularly relates to an adjusting system for axial thrust of a steam turbine under variable working conditions and a using method of adjusting system. According to the technical scheme, the adjusting system for the axial thrust of the steam turbine under variable working conditions comprises a steam turbine, a balance disc is installed on a rotor of the steam turbine, and a thrust bearing is connected to a stator of the steam turbine. The steam turbine is provided with a first steam extraction opening and a second steam extraction opening, the first steam extraction opening and the second steam extraction opening are connected with the balance disc through pipelines correspondingly, and the distance between the first steam extraction opening and a steam inlet of the steam turbine is smaller than the distance between the second steam extraction opening and the steaminlet of the steam turbine. A first adjusting valve is connected to the pipeline between the first steam extraction opening and the balance disc, and a second adjusting valve is connected to the pipeline between the second steam extraction opening and the balance disc. According to the adjusting system and the using method thereof, the stress condition of the thrust bearing can be changed under the variable working condition of a steam turbine mechanism so as to guarantee the control allowable range of the resultant force borne by the thrust bearing.

A centrifugal compressor for a heavy oil hydrogenation device is composed of the four parts of a stator assembly, a rotor assembly, a bearing group and dry gas seals. The stator assembly comprises a cylinder block, end covers, partition plates and a seal. The rotor assembly comprises 6-8 impellers, a main shaft, spacer sleeves, a balance disk, a thrust disk, nuts, an adjusting pad and a stopper ring. The bearing group comprises two supporting bearings and a thrust bearing. The dry gas seals are provided with independent control units and independent systems and each comprises a body and a control portion. The centrifugal compressor for the heavy oil hydrogenation device is characterized in that (1) the compressor is of a vertical subdivision type structure; (2) the partition plates are assembled together to form a partition plate bundle, and a bladeless diffuser is arranged between every two adjacent partition plates; (3) the 6-8 impellers are sequentially arranged on the main shaft, and the diameter of each impeller is 400 mm; (4) the blade forms of the impellers are identical, and the blades of one impeller deviate by a certain angle relative to the blades of the impeller locatedin the front; (5) the supporting bearings are titling-pad bearings, the thrust bearing is of the Kingsbury type, and the two sides of the thrust bearing are of the same structure; (6) the dry gas seals are installed at the two ends of the compressor, and the dry gas seals are provided with the independent control systems.

The invention discloses a low-wind-speed wind turbine blade which is a skewed blade. A stacking line of the blade meets a specific curvilinear equation. The low-wind-speed wind turbine blade is large in output power and high in wind energy utilization rate.

In a first process, a tangential friction coefficient of a non-slippage side pulley of a drive pulley and a driven pulley is estimated from a tangential friction coefficient and a winding diameter of a slippage side pulley. In a second process, torque transmitted by a metal belt is calculated from the tangential friction coefficient and the winding diameter. In a third process, a required axial thrust of the non-slippage side pulley is calculated from the torque and the winding diameter. In a fourth process, the gear ratio is changed by reducing a ratio holding axial thrust of the non-slippage side pulley toward the required axial thrust. Therefore, the gear shifting can be performed merely by reducing the axial thrust of the non-slippage side pulley, and thus it is possible to improve the durability of the pulleys or the metal belt and to reduce a load of a hydraulic pump.

The invention discloses a mechanical double-screw driving auxiliary, mainly composed of box body, input shaft, output shaft, master driving screw, slave driving screw and bearing, where the screw driving auxiliary is set in the box body, the input shaft is set with two driving screws; the output shaft is set with two slave driving screws; the mutually-engaged master and slave driving screws rotate oppositely. It both has higher transmission efficiency and can be designed with self-locking function or not according to requirements. Compared with ordinary involute gear driving auxiliary of the same power, it has not only the character of driving efficiency but the advantages of small bulk, light, low noise and stable driving, and also mechanical power amplifying effect. Therefore, it can replace ordinary driving gears and applies to driving systems.