45 results about "Viscous shear" patented technology

Smooth, preferably variable-sweep fluid collection device surfaces disposed into opposition with wind, river, surf, ocean or tidal currents generate enhanced velocity fluid flows at length driven into onboard work-extracting disc turbines at advantageous angles of attack. Keyed to shafts turning freely through optionally extendable volutes, disc turbines comprising a dense population of smooth, axially fixed or adjustably spaced discs conducting preferably laminar flow between adjacent elements develop significant torque through boundary layer adhesion and viscous shear-stress between fluid layers. Exhaust of disc turbine throughput into divergent channels drafting into external currents of initially higher than ambient velocity and lower pressure may reduce turbine discharge backpressure, rapidly clear system throughput, and allow normally disadvantageous drag to be utilized to develop greater work generation. Gainfully turning with, instead of at odds to natural or anthropogenic currents provided, disc turbines utilized as disclosed may provide unprecedented renewable energy from fluids in motion.

The invention relates to a device (1) for generating X-rays (57). The device comprises a source (7) for emitting electrons (53) and a liquid metal for emitting X-rays as a result of the incidence of electrons. The device further comprises a displacing member (11) for displacing the liquid metal through an impingement position (55) where the electrons emitted by the source impinge upon the liquid metal. As a result of the flow of liquid metal through the impingement position the heat, which is generated in the impingement position as a result of the incidence of the electrons upon the liquid metal, is transported away from the impingement position.

According to the invention, the displacing member (11) has a contact surface (61), which is in contact with the liquid metal in the impingement position (55), and a driving member (31) for moving the contact surface in a direction which, in the impingement position, is substantially parallel to the contact surface. Thus the flow of liquid metal in the impingement position is achieved as a result of viscous shear forces in the liquid metal caused by friction forces between the liquid metal and the moving contact surface. As a result, the necessary pressure of the liquid metal is limited.

The invention discloses an underfilled magnetic liquid shock absorber adopting a first-order buoyancy principle, belongs to the field of vibration in mechanical engineering, and successfully solves the problem that an existing magnetic liquid shock absorber cannot be applied in engineering practice due to many structural problems. The device comprises a base (1), an annular permanent magnet (2), a shell body (3), nuts (4), a sealing ring (5), a washer (6), a magnetic liquid (7), a first circular permanent magnet (8), an end cover (9), a mass block (10), a cavity (11), a second circular permanent magnet (12) and bolts (13), wherein the shell body is not completely filled with the magnetic liquid (7); the non-magnetic mass block (10) moves in the shell body (3), and generates friction, collision and viscous shearing with the magnetic liquid (7) to consume energy in the case of external vibration; and an electrical eddy current is generated in the mass block (10) to accelerate consumption for the vibration energy and achieve the purpose of shock absorption when the mass block (10) is made from a conductor material.

The invention discloses a cooking utensil with air curtain generating devices. The cooking utensil with the air curtain generating devices comprises cooking benches and the air curtain generating devices, wherein the cooking benches are provided with cooking cores; the air curtain generating devices comprise fans, and air exhausting devices which are used for blowing out airflows generated by the fans; the air exhausting devices are located on the peripheries of the cooking cores; and moreover, multiple air outlets are formed in the air exhausting devices. The cooking utensil with the air curtain generating devices is characterized in that the air outlets are oblique relative to both the horizontal direction and the vertical direction; and the airflows are enabled to have horizontal tangential velocity components, relative to the centers of the cooking cores, when passing through the air outlets. Through providing shearing force in the horizontal direction, the rotary motion is transferred through the self viscous shearing force or the turbulent shearing force of a fluid; oil fume is enabled to form a vortex; the effect of shielding ambient airflows can be achieved to some extent; a smoke sucking area of an extractor hood is controlled; meanwhile, the cyclone aspiration is formed; and the smoke gathering and sucking capacity is promoted.

Vacuum insulating glass (VIG) units, edge seals for VIG units and methods for forming the edge seals are provided. The VIG units include an edge seal that includes a viscous material, which serves to restrict the rate at which gas permeates into a vacuum space defined between the glass sheets of the VIG unit. The edge seals are configured to allow the glass sheets to move laterally relative to one another when the glass sheets experience differential thermal strain and further configured such that viscous shear occurs within at least a portion of the viscous material when there is relative lateral movement between the glass sheets.

The invention relates to the technical field of graphene preparation, in particular to a method for preparing graphene nanoplatelets by viscously mechanical shearing and stripping. According to the method, graphite is dispersed in a viscous solution, the viscous solution is quickly connected with surface atoms of graphite crystal after contacting with the graphite crystal, a binding force between the viscous solution and the surface atoms of the graphite crystal is larger than an interlamination bonding force of the graphite crystal, and by taking the advantage of a viscous shearing force of the viscous solution, graphite is gradually stripped in a stirring process to obtain graphene. The method for preparing the graphene nanoplatelets by viscously mechanical shearing and stripping has the advantages of low preparation cost, easiness in control of a preparation process, environment friendliness, simple procedures and promising industrial prospect.

The invention belongs to the field of civil engineering seismic resistance and shock absorption, and discloses a viscous shear type damper with replaceable steel insertion plates. The viscous shear type damper comprises an upper end plate, a lower end plate, a plurality of steel insertion plates and a plurality of bolt pins, wherein a first middle vertical plate is arranged on one side of the upper end plate; a left side vertical plate, a right side vertical plate and a movable middle layer plate are arranged on the lower end plate; a second middle vertical plate and a third middle vertical plate are arranged on the middle layer plate in a spaced manner; a front baffle and a rear baffle are arranged between the left side vertical plate and the right side vertical plate; the inner side surface of the left side vertical plate and the inner side surface of the right side vertical plate are each provided with two middle baffles; a viscous device is arranged between each middle baffle and the middle layer plate; a plurality of lead blocks are arranged on the first middle vertical plate; a plurality of shock absorbers are arranged between the first middle vertical plate and the front baffle and between the first middle vertical plate and the rear baffle; and the steel insertion plates penetrate the vertical plates and are connected through the plurality of bolt pins. Deformation is borne by a plurality of energy consumption components, the shock absorption and energy consumption performance is excellent, the hysteresis curve is good, and replacement is convenient.

The invention belongs to the technical field of fluid measurement, and particularly relates to a parallel array hot line probe and a wall surface shearing force measurement method. According to a wallsurface shearing force measurement method, the speeds of two position points, far way from a wall surface at different heights, in a viscous bottom layer of a wall region, are simultaneously measuredin one time by the parallel array hot line probe, the fluctuating velocity is small, the additional shearing force generated by fluctuating velocity is also small, a viscous shearing force of the viscous bottom layer has a main guide effect, the speed in the viscous bottom layer and the wall surface distance are in linear distribution, and the product of slop (U2-U1)/d and a coefficient Mu of kinetic viscosity is a shearing force. The parallel array hot line probe is carried on a mechanical arm during measurement, a mechanical arm control driver is controlled to drive the mechanical arm to move and adjust by an upper computer, rapid moving of different positions of the wall surface can be achieved, and the measurement demand of the shearing force at different positions of the wall surfaceis solved very well.

The invention provides a viscous shear type damper comprising a sealed housing, an axial moving part, a rotating moving part and a shearing part. The sealed housing is filled with a shear medium; theaxial moving part axially sealingly passes through the housing; the rotating moving part is arranged in the housing; the axial moving part and the rotating moving part form matching, so that the axialmovement of the axial moving part cam drive the rotating moving part to rotate; and the shearing part is fixedly mounted on the outer periphery of the rotating moving part. The viscous shear type damper has an improved damping force to self weight ratio, and is particularly suitable for the field of bridge vibration resistance.

A damping device using viscous shear to moderate substantially linear movement. The device has a housing with one or more reservoirs containing a viscous fluid, such as silicone, and one or more retractable struts that can extend from the housing. The strut has a portion formed as a toothed rack, and an associated axle has a pinion gear on a portion associated with the toothed rack of the strut. The teeth of the rack mate with teeth of the pinion gear. A disk, or preferably series of spaced disks, can be mounted on the axle inside the reservoir to dampen linear movement of the strut, from shear with a static plate adjacent to the disk on the axle. The relatively fixed, spaced disks or plates are adjacent to or interdigitated with the disks on the gear axles to dampen linear movement of a strut.

The invention relates to a method for inhibiting the hydration expansion of shale by using a mud optimization technique. The method comprises the following steps: 1, adding a fluid loss reducing material so as to meet the requirement that the reduced mud fluid loss FL is less than or equal to 4.0ml and further prevent the phenomenon that chip off-falling is formed since the shale is peeled off after water swelling; 2, adding a mud inhibitor so as to inhibit the hydration expansion of the shale and reduce the borehole wall collapse degree; 3, adding a blocking anti-collapse agent so as to form mud cakes on a borehole wall and further maintain the stability of the borehole wall; 4, improving the viscous shearing force and cuttings carrying capacity of mud so as to take out the chip off-falling and cuttings in a well and guarantee the cleanness of a borehole and the safety of borehole operation. After the method is used, mud fluid loss is effectively reduced, mud inhibition ability and blocking anti-collapse property are enhanced, the cuttings carrying capacity of the mud is improved, the construction risk of a shale section is greatly reduced, and shale gas well drilling and logging operation are enabled to be safely and smoothly implemented.

The invention discloses a range hood serially connected with double fans. The range hood comprises an exhaust fume collecting hood, a fan housing and a first fan arranged in the fan housing, wherein an air inlet is formed in the exhaust fume collecting hood. The range hood serially connected with double fans is characterized in that a second fan is arranged at a position, positioned above the air inlet, in the fan housing, and is a centrifugal fan; an air inlet of the second fan faces downwards; a first channel for fume air current to pass through is formed in the middle of the second fan; a second channel for the fume air current to pass through is formed between the periphery of the second fan and the fan housing. The fan of which the air inlet faces downwards is arranged in the fan housing to form the range hood serially connected with the double fans, so that strong negative pressure downwards extending is formed in the middle of the fan, and further a strong sucking and gathering effect on the fume air current under the fan is formed; in addition, rotating motion of an impeller of the fan is transmitted by a viscous shear force or a turbulent shear force of the fluid, so that air current inside the impeller and in a certain extending area of the impeller forms vortex, and further the fume collecting and sucking capability is improved.

The invention discloses a device for accurately calculating floc strength based on a laminar flow condition. The device comprises an inner cylinder and an outer cylinder which are coaxially arranged, a gap b is formed between the inner cylinder and the outer cylinder; the outer cylinder is connected with the horizontal base through the outer cylinder base in a flange form; a screw is installed in the center of the inner cylinder, one end of the screw is installed on the outer cylinder base through a bearing, the other end of the screw is in transmission connection with a motor, and the motor is installed on the horizontal base through a motor fixing support. And the motor is connected with a motor controller through a cable. The method for calculating the strength of the floc mainly utilizes the principle that under the laminar flow condition, when the viscous shear force F of fluid is equivalent to the viscous force B of the floc, the floc is damaged, and the shear force borne by the floc is calculated through the Newton internal friction law, so that the strength of the floc is obtained. The method is simple and convenient in testing means and relatively accurate in calculation result, and can be used for quantitatively testing the strength of the floc.