65results about How to "Increase dynamic pressure" patented technology

In a radial minute gap between a substantially columnar shaft and an inner peripheral face of a substantially cylindrical sleeve, oil is retained and a radial dynamic pressure bearing is formed. A plurality of recessed portions are arranged in a circumferential direction on at least one of an outer peripheral face of the shaft and the inner peripheral face of the sleeve and a first hill portion is provided to an axial end portion of each the recessed portion. Thus, it is possible to achieve a dynamic pressure bearing with which sufficient radial shaft support can be obtained in spite of a short axial length.

A disk drive device includes: a hub on which a recording disk is to be mounted; a shaft; a sleeve configured to house the shaft and to be rotatable relatively with respect to the shaft; a radial space portion formed between the inner circumferential surface of the sleeve and the outer circumferential surface of the shaft; a radial dynamic pressure generating portion configured to generate radial dynamic pressure between at least part of the inner circumferential surface of the sleeve and the outer circumferential surface of the shaft in the radial space portion; and lubricant. The axial length of the radial dynamic pressure generating portion is formed to be longer than the diameter of the radial dynamic pressure generating portion such that radial dynamic pressure, which is defined with the axial length of the radial dynamic pressure generating portion and the diameter thereof being parameters, is greater than or equal to a predetermined minimum reference value.

An apparatus and method for controlling charged particles. The charged particles comprise electrons and positive ions. A magnetic field having only point cusps is used to confine energetic injected electrons and so to generate a negative potential well. Positive ions injected into or created within the negative potential well are trapped therein. The magnetic field is generated by current-carrying elements arranged at positions spaced from but closely adjacent and parallel to edges of a polyhedron which has an even number of faces surrounding each vertex or corner. The current-carrying elements must be spaced apart at their corners (the vertices of the polyhedron) so as not to touch, and the containing structures for the current-carrying coils of the magnetic-field-providing system are conformal to the fields so produced.

In order to prevent lubricating oil leak due to bubbles in thrust dynamic pressure bearing of herringbone grooves, stabilize the bearing performance, and enhance the reliability and durability, auxiliary grooves deeper than pump-in type herringbone grooves for generating dynamic pressure are provided, and the bearing inner periphery and bearing outer periphery are linked by a pressure gradient descending slowly, and therefore bubbles present in bearing inner periphery can be guided into the bearing outer periphery through auxiliary grooves, and discharged to outside of the bearing from the air-liquid interface, so that lubricating oil leak due to bubbles can be prevented.

A thrust dynamic pressure bearing apparatus includes a shaft member and a thrust plate having a fixing hole that is provided with chamfered sections Ca and Cb at the fixing hole. The shaft member is shrink fitted or pressure inserted in the fixing hole of the thrust plate. The chamfered sections Ca and Cb have axial lengths La and Lb in the axial direction. Dimensional relations of the axial lengths La and Lb in the chamfered sections Ca and Cb are set to be within a specified range to evenly distribute the bonding force of the thrust plate applied to the shaft member along the axial direction.

The invention belongs to the technical field of cooking fume treatment devices, and discloses a zero-sum type low-carbon range hood. The zero-sum type low-carbon range hood comprises a cooking fume discharge system and an inner cycle cooking fume suction system. The cooking fume discharge system is composed of a condensation plate, a filter layer, a cooking fume suction fan, an air distribution adjuster, a pressurization box a pressurization fan, a non-return air valve and an exhaust pipe. The inner cycle cooking fume suction system is composed of the condensation plate, the filter layer, thecooking fume suction fan, the air distribution adjuster, a static-pressure box, a connecting air flue, an air curtain air outlet and an air curtain. The zero-sum type low-carbon range hood has the cooking fume suction function more excellent than that of a range hood and an integrated stove. Cooking fumes are filtered, the interior of a range hood body does not need to be cleaned, and pollution ofthe cooking fumes to the atmosphere is reduced; and the cooking fumes generated by cooking are wrapped to flow through a cooking fume filter screen and then are fed into the cooking fume suction fan,cooking fume diffusion is suppressed, cooking fume escape is avoided, and the cooking fumes are thoroughly exhausted. Comprehensive energy consumption is smaller than 1/10 of that of the range hood and the integrated stove, and healthier, more low-carbon, more environment-friendly and safer home life guarantees can be provided for wide users.

The invention discloses a kind of guiding fan for ventilation in large location, the structure comprises chassis, snoot with variable angles, there sets electricity machine and cross-flow blade wheel connecting to the output shaft at the side of the chassis, its shaft direction corresponds to the shaft of the snoot. There has a guiding volute on the inner wall of chassis back of the blade wheel, there has a countercurrent resisting volute tongue, when the electricity machine drives the blade wheel to rotate, the air enters form the back of the chassis, through guiding volute, countercurrent resisting volute tongue and snoot, it uses high speed air to guide air to the fixed direction and region.

A rotating device comprises a stator configured to rotatably support a rotor via a lubricant. A first zonal region is formed on an inner surface of a sleeve. A plurality of grooves along a direction that crosses the first zonal region are formed on the first zonal region from each of both sides of the first zonal region. A groove formed from one side of the first zonal region is formed so that the closer a position in the groove is to the other side of the first zonal region, the shallower and the narrower the groove at the position will be. A groove formed from the other side is formed so that the closer a position in the groove is to the one side, the shallower and the narrower the groove at the position will be.

The invention discloses a device and a method for preparing a fiber reinforced silica sol composite shell through airflow laying. The device comprises a fiber laying chamber, a fiber storage chamber,an air supply unit and a support, wherein the fiber laying chamber is a hollow cube and is composed of four side vertical plates and an upper bottom surface exhaust hole plate and an upper bottom surface exhaust hole plate, and an exhaust hole is formed in the upper bottom surface exhaust hole plate; a rotating shaft used for bearing the shell sample is installed in the fiber laying chamber; the fiber storage chamber is of a hollow inverted quadrangular frustum shape formed by four side plates and a lower bottom surface air inlet plate, a fiber storage rack is arranged in the fiber storage chamber, and airflow guide holes are formed in the fiber storage rack; and the fiber spreading chamber is located right above the fiber storage chamber, the side length of the side vertical plate of thefiber spreading chamber is equal to the side length of the side plate of the fiber storage chamber, and the four side vertical plates and the four side plates are fixedly connected in a one-to-one correspondence manner. According to the device and the method, the fibers can be uniformly distributed in the shell, the fibers can be laid on the shell in a quantitative mode, so that the performance ofthe prepared shell is consistent, and the fiber with the large length-diameter ratio can also be added into the shell.

The present invention provides for a fuel piping arrangement in common rail type fuel supply systems, the supply system comprising at least one common rail and at least one respective injector, wherein the common rail is connected with the at least one injector directly, by means of only one joint.

The invention relates to a water lubrication dynamic and static pressure ladder groove step bearing, comprising a bearing pad and a main shaft arranged in the bearing pad. The inner wall of the bearing pad which is also the oil sealing surface of a bearing is provided with an annular ladder-shaped groove; the bearing pad is separated into a plurality of mutually communicated areas by the annular ladder-shaped groove; the annular ladder-shaped groove is internally provided with shallow cavities; and the bearing pad is also provided with oil inlet holes and cooling holes which are both communicated with the annular ladder-shaped groove. In the invention, the oil sealing surface of the bearing is provided with the ladder-shaped deep groove for dividing the surface of the bearing into a plurality of areas, and the shallow cavities with depth less than that of the groove are arranged in the areas surrounded by the ladder-shaped groove. The shallow cavities surrounded by the ladder-shaped groove can enhance the dynamic pressure and improve the bearing capability and rigidity of the bearing. A plurality of oil supply holes and cooling holes are arranged in the ladder-shaped groove so that high-pressure lubricating medium can be pumped into the gaps of the bearing through the small holes, the flow rate of the surface of the bearing pad is improved, the temperature raising is reduced, and the continuity of the oil film is ensured.

The invention relates to a device (6) for pressure- dependent opening of a suction intake (10), comprising a suction jet pump (11), comprising a feed line (12), an outlet line (13) and the suction intake (10); a valve body (15), displaceably arranged inside the feed line (12) in the delivery direction (14) of the suction jet pump (11) and having an effective area (16) exposed to the feed pressure of the suction jet pump (11); and a spring element (17), arranged between the feed line (12) and the valve body (15), for applying a force in opposition to the feed pressure inside the feed line (12); wherein the effective area (16) of the valve body (15), and the spring element (17) are designed so that the valve body (15) closes the suction intake (10) so that it is fluid-tight below a predefined pressure inside the feed line (12) and opens said intake when the predefined pressure inside the feed line (12) is exceeded. The invention further relates to a fuel tank, comprising a device (6) for pressure-dependent opening of a suction intake (10).

The invention relates to a flow monitor for monitoring the flow of flowing media, wherein a paddle projecting into the flow transfers the rotating movement of the paddle onto a display device by means of a magnetic gear comprising a plurality of individual magnets corresponding with each other.

The invention discloses a dry gas seal slotting method and device based on slot bottom micro model design. A relatively reasonable and complete slot bottom interface roughness model is established, the mechanism of the reasonable roughness model design on sealing performance improving and slotting technology standard lowering is elucidated, accordingly an orderly model design method based on the dry gas seal slot bottom roughness microeffect is finally achieved, the dry gas seal performance is improved, and the slotting technology method is simplified.

A hydrodynamic bearing device which can improve reliability by stabilizing a balance of dynamic pressures generated at a thrust bearing portion. The spindle motor 1 includes a hydrodynamic bearing device 4 including a shaft 41, a sleeve 42, first and second thrust flanges 41b and 41c, first and second thrust bearing portions 72 and 73 and thrust dynamic pressure generating grooves 72a and 73a. The thrust dynamic pressure generating grooves 72a and 73a are formed such that a plurality of groove portions are connected without being isolated from each other, and the groove depth becomes greater from the inner periphery toward the outer periphery.