48results about How to "Reduce peripheral speed" patented technology

A blade (1) for a tail anti-torque device of a helicopter, said device comprising a ducted rotor (13). The blade (1) has an assembly of sections, a leading edge (2) and a trailing edge (3); a stacking line (4) of the profiles extending at a distance lying in the range 25% to 50% of the chord (C). The stacking line (4) presents a shape that is curved having successively from the root (5) to the end (6) of the blade a back sweep, a forward sweep, and a last back sweep; and a chord (C) that becomes larger going towards the end (6) of the blade (1) over at least the end profile (1a).

Contemplated gearboxes provide first and second power-balanced paths in which a speed changer is configured to operate with only one path. Most preferably, the gearbox includes a friction clutch and a sprag clutch arranged such that, together with a layshaft and spur-gear differential, gear shifting can be done while transmitting power.

A seal structure is disclosed as mounted in a coupling 1, exposed in the vicinity of a stationary member 14, with a dust cover 15 being mounted to a cylindrical member 19 for preventing foreign material from entering a gap between the coupling 1 and the stationary member 14, and a seal member 17 is disposed at a position opposed to the dust cover on the stationary member 14, with a seal portion 123 of the seal 17 being held in sliding contact with the dust cover 15.

The invention provides a diagonal flow pump. The diagonal flow pump comprises a pump shaft, an inlet section, a cylindrical outer barrel and a bent pipe section, wherein the pump shaft penetrates through the cylindrical outer barrel and the bent pipe section, blades are mounted on the pump shaft, an inner cavity wall surface of the inlet section comprises an inlet chamber wall surface and a rotating wheel chamber wall surface, the inlet chamber wall surface is a conical surface, the rotating wheel chamber wall surface is an arc surface, the rotating wheel chamber wall surface is tangential with the inner wall surface of the cylindrical outer barrel, the blades are located in a rotating wheel chamber of the inlet section, and an annular groove is formed in the junction position of the inlet chamber wall surface and the rotating wheel chamber wall surface. The diagonal flow pump can weaken the strength of the blade-tip leakage flow at an inlet and reduce the influence of the blade-tip leakage flow to flowing inside an impeller, the performance of the diagonal flow pump is improved, appearance of hump zones is effectively inhibited, and the running stability of the diagonal flow pump is improved.

The invention discloses a centrifugal compressor with inlet guide blades and a turbocharger. The centrifugal compressor comprises a volute, an impeller and guide blades, wherein an air inlet channel, an impeller mounting space and an air outlet channel are defined in the volute, the impeller mounting space is respectively communicated with the air inlet channel and the air outlet channel, and the air inlet channel is provided with an air inlet and the air outlet channel is provided with an air outlet; the impeller can be rotationally arranged in the impeller mounting space by surrounding around a revolving shaft and is provided with a plurality of blades; and guide blades are arranged on a peripheral wall of the air inlet channel. According to the centrifugal compressor provided by the invention, the peripheral speed of fluid such as air in the air inlet channel is reduced by the fact that the guide blades are mounted, so that air inflows at the tips of the blades can be more uniform; and moreover, and the sudden change of the peripheral speed can be reduced, so that the increasing ranges of thermal charges at the tips of the blades can be reduced, the property of the centrifugal compressor can be further improved, especially, the property can be remarkably improved under the small flow working condition.

The invention relates to a device of adjusting bypass ratio of a turbofan engine continuously, in particular to a self-driven outer duct contrarotating annular fan blade compressing device. The self-driven outer duct contrarotating annular fan blade compressing device comprises an inner duct of the engine. A duct arranged on the outer side of the inner duct is a third outer duct, two rows of contrarotating members are arranged between an inlet guide vane and a stator vane in the third outer duct, the two rows of contrarotating members are separately upstream rotating members and downstream rotating members, and the upstream rotating members and downstream rotating members are arranged on a duct cartridge receiver of the third outer duct through a turntable bearing, separately. By adoptingthe two rows of contrarotating annular fan structures, the rotating speed of a rotor structure is reduced effectively and the dimension of the third outer duct is decreased effectively on the condition that the pressure ratio and the flow of the third outer duct are the same, so that the noise, the electric power consumption and the design difficulty are reduced, the working range of the turbofanengine is expanded greatly, and a variable cycle advantage of the engine is exerted to a greater extent.

The invention relates to a grinding wheel which is characterized in that the grinding wheel has the following components: 30-35% of alumina, 30-35% of single alundum and 30-40% of carborundum, and the ratio between the alumina and the single alundum is 1:1. After being trimmed, the grinding wheel has two symmetric sections of width outer margins formed by a first sine curve and a second sine curve smoothly connected with the first sine curve. When the grinding wheel is used for grinding a high-speed steel roller, the rotation speed and the Z-axis speed of the grinding wheel can be reduced, however, the amount of feed is increased, and the grinding time is reduced. The grinding wheel has prolonged service life and reduces the time for the grinding wheel replacement and the labor intensity of grinder workers. The amount of sand and mud is reduced during the grinding so that the environment around a grinder can be improved; and the cost performance of the grinding wheel is remarkably improved.

A water jet pump is provided which reduces cavitation and thereby allows an improvement in pump efficiency. In a water jet pump in which an impeller driven for rotation and is provided in a cylindrical housing, an edge portion of the outer circumferential surface of the impeller that opposes the inner surface of the housing is formed with a radius of curvature. This structure reduces a variation in the pressure of a water stream passing between the outer circumferential surface of the impeller and the inner surface of the housing toward the impeller front surface side, thereby reducing the occurrence of cavitation and improving the pump efficiency.

The invention discloses a swing radial piston variable-capacity pump with static and dynamic pressure balance; it solves the problem of keeping axial under the transient load mode. In the pump body installed a stator swing span and a swing span rotation shaft, the swing roller bearing on the stator swing span connects with an end of the stator mount, the other end of the stator mount connects with the stator; on the plunger connecting rod sliding boot installed a static pressure balance chamber, the holding rings are arranged on the two sides of the plunger connecting rod sliding boot which has a fit clearance with the holding rings; the rotor rotates the stator simultaneously via the plunger piston; the needle roller bearings are arranged on the two inner circles and fit with the port axle. In the invented device, the rotor and stator rotate simultaneously, the plunger connecting rod sliding boot slices on the inside surface of the stator, the linear speed is 0 or very low (0-40r/min).

In a bearing assembly of a centrifugal revolving drum (1) around a spin axis (6), the revolving drum (1) is fixed by rotation through a drum hub (2) and a hanger bracket (21) of the revolving drum (1) and connected with a drive shaft (3). The drive shaft is connected with a drive set (12) and extends along the spin axis (6) in the bearing block (4, 7, 8, 9, 20, 24). The revolving drum (1) is supported on the bearing block (4, 7, 8, 9, 20, 24), thereby basically separating supporting force generated by power from the drive shaft (3).

A wheel driving apparatus including a cylindrical inner housing (18) supported by a vehicle body via a suspension, a wheel (14) supported by the cylindrical inner housing (18) so that the wheel (14) is rotatable relative to the cylindrical inner housing (18), a motor (40) having a stator (44) attached to the cylindrical inner housing (18) and a rotor (42) attached to the wheel (14), wherein the wheel includes: a main body portion (60); and an outside portion (64) positioned on an outer side of the vehicle body, and the rotor (42) is attached to the main body portion (60).

To produce a cross wound bobbin (11), at the workstation (2) of a bobbin winder (1), the yarn (30) is wound at the start of a winding cycle at a crossing angle to increase the density of the bobbin core. The crossing angle is increased significantly during the winding cycle, so that the density of the wound bobbin is reduced progressively outwards. The increased crossing angle acts against the yarn laying width, and the stroke movement of the reciprocating yarn guide (29) has a defined increase.

A main motor (100) comprises a stator (10), a rotor core (4), an iron core clamp (5), a cooling fan (30), a rotor (7), a frame (2), a bracket (1), and a bearing section (50). The cooling fan (30) comprises: a main plate (31) that partitions the inside and outside of the totally enclosed main motor (100); a plurality of blades (32) provided in the rotation direction of the rotor (7), on the bracket (1) side of the cooling fan (30); and a guide (33) provided on the bracket (1) side of the blades (32). An air intake port (20) is provided in the bracket (1), inside an area formed by projecting the guide (33) on to the bracket (1). The guide (33) is formed such that the air taken in from the air intake port (20) is guided to a rotor shaft (9).

The invention relates to a carding machine for producing fleece from fiber material, comprising at least one tambour (2), having at least two doffing rollers arranged one after the other in the working direction and having a compressing roller (8), which is operatively connected to all doffing rollers downstream of the tambour (2), wherein the carding machine (1) is designed to transfer at least two layers of card web (20) by means of at least two doffing rollers to a compressing roller (8), wherein each of the at least two layers of card web are compressed separately by means of the compressing roller (8) and are joined on the compressing roller (8) into a single layer of card web (20) and said layer of card web (20) is removed, by means of a transfer roller (9), on an outlet side of thecarding machine for further processing. The invention is characterized in that the compressing roller (8) has a diameter of at least 600 mm.

The invention discloses a labyrinth seal structure with brush type seal strips. The labyrinth seal structure comprises a labyrinth seal and the brush type seal strips. The labyrinth seal is used for being mounted in the circumferential direction of a rotor in a sleeving manner, and a clearance is left between the labyrinth seal and a rotor. The labyrinth seal comprises a seal body and labyrinth teeth arranged on the inner side of the seal body. The brush type seal strips are assembled in an axial through groove in the axial direction, wherein the axial through groove is formed in the inner side of the labyrinth seal, the brush type seal strips penetrate the seal body in the axial direction, and the at least four brush type seal strips are arranged in the circumferential direction of the labyrinth seal. According to the labyrinth seal structure, according to a turbo machine rotor system, the labyrinth seal structure with the brush type seal strips is provided for the requirements for reducing forward rotational flow of a seal chamber, improving the seal rotor power characteristic, improving rotor stability and reducing the seal leakage amount; the forward rotational flow of the sealchamber can be effectively reduced, effective damping of a traditional labyrinth seal can be increased, and the seal leakage mount can be reduced; and therefore the problem of rotor vibration unstability is solved, and the stability and sealing performance of the rotor system are improved.

A power transmission device includes a first one-way clutch that transmits a rotational power of a pulley to a rotating shaft, and a second one-way clutch that transmits a rotational power of a rotor of a motor to the rotating shaft. The first one-way clutch is of inner cam type in which an engagement cam-surface is formed in an outer periphery of a first inner ring, while the second one-way clutch is of outer cam type in which an engagement cam-surface is formed in an inner periphery of a second outer ring. This arrangement improves engagement performance of the first one-way clutch as well as reducing heat generation of the second one-way clutch, so that the lifetime of grease is prolonged.

A centrifugal pump includes a radial impeller surrounded by a housing. The housing has a channel associated with a front side space between a cover of the impeller and the casing. Flow is led through the channel from a pressure region of the pump to a radial gap at a suction region of the pump. The flow in the channel reduces angular momentum and results in an increase in pressure in the front side space which acts of in the cover side of the impeller to offset axial force from a rear side of the impeller.

The invention provides a matched improved structure for an impeller and a guide vane body bodies of an axial flow pump. The matched improved structure comprises a casing, an the impeller and two guide vane bodies, wherein the impeller comprises a hub and a plurality of vanes which are equidistantly distributed on the periphery of the hub; each vane is provided with an upper end surface, a lower end surface, a pressure surface, a rear end surface and a front end surface; and the axial displacement between any point on the each front end surface and the hub is equal to the axial distance between another point on the each front end surface and the hub. When the axial displacement between the each front end surface and the axis of the hub is R, an intersection line between the each pressure surface and the corresponding front end surface is a first intersection line; an intersection line between the each front end surface and the corresponding upper end surface is a second intersecting line; and an included angles between each points on the each first intersecting line and the each second intersecting line is are the same. According to the structure for improving the impeller and the guide vane bodies thereof, which is disclosed by the invention, the circumferential velocity component of fluid in the impeller is reduced, so that the circumferential velocity component of the fluid in the impeller approaches to the circumferential velocity of the impeller vane more difficultly and the effect of lifting a load pressure is achieved.