69results about How to "Reduce fluid velocity" patented technology

Junk basket 10 is provided for collecting debris from a wellbore cleaning operation, and includes a central mandrel 14 having a throughbore 16 and an outer shell 24 defining a generally annular junk space 40. The outer shell 24 may be configured such that the annulus 27 includes a reduced portion 28. Flow holes 30 in the outer shell are preferably angled substantially upward, and are positioned to discharge fluid to the annulus 27. According to a method of the invention, fluid is passed from an upper tubing string, through the central mandrel, into the wellbore and upward through the annulus and past the flow holes, thereby reducing pressure of flow past the well holes to pass fluid from the junk space through the flow holes.

A flow control element comprises a cylindrical element body having a bore formed therethrough. The cylindrical element body may include inner and outer peripheral surfaces and define a plurality of tortuous flow passages which extend between the inner and outer peripheral surfaces. The flow control element is formed as a unitary structure wherein the flow passages are oriented along at least two axes. The flow control may be formed by direct to metal laser sintering wherein successive layers of powdered metallic material are solidified by applying laser energy to the selected portions until the flow element is formed as a unitary structure with a plurality of flow passages extending therethrough. The laser energy is selectively applied to the powdered metallic material according to a computer model of the flow control element.

Junk basket 10 is provided for collecting debris from a wellbore cleaning operation, and includes a central mandrel 14 having a throughbore 16 and an outer shell 24 defining a generally annular junk space 40. The outer shell 24 may be configured such that the annulus 27 includes a reduced portion 28. Flow holes 30 in the outer shell are preferably angled substantially upward, and are positioned to discharge fluid to the annulus 27. According to a method of the invention, fluid is passed from an upper tubing string, through the central mandrel, into the wellbore and upward through the annulus and past the flow holes, thereby reducing pressure of flow past the well holes to pass fluid from the junk space through the flow holes.

A method and apparatus for supplying liquid anhydrous ammonia to a pump or other flow control system whereby a separation chamber removes vapor generated by friction in the flow path from a storage tank containing saturated anhydrous ammonia. Additionally, liquid ammonia in the separation chamber creates a static head pressure. The difference in height between the inlet near the top of the separation chamber and the outlet at the bottom causes the static head pressure. The static head assures pure liquid at the bottom since absolute pressure exceeds saturation pressure. As a result, the feed stream to the pump or other flow control system is free of ammonia vapor.

A gas separator on pipe structured to transport a liquid is provided. The gas separator includes a section of piping, located upstream of a pump, having an increased diameter which is in fluid communication with an overhead pocket. Fluid flow in the portion of the pipe having an increased diameter is at a slower rate than other portions of the pipe. The slower fluid speed allows entrained gasses to stratify and float to the top of the pipe whereupon the gas will flow into the pocket. Thus, the fluid downstream from the gas separator has a reduced amount of gas in the liquid flow.

A catheter tip designed to reduce the outflow velocity and / or directional momentum of fluid being infused by a catheter having such a tip. In one variation, a plurality of channels is provided at the distal portion of the catheter to increase the outflow cross-sectional area. In another variation, the diameter of the catheter at its distal portion where the fluid exits is increased. In yet another variation, a bullet-shaped nose is implemented which may decrease turbulence at the distal end of catheter tip. The low velocity outflow catheter tip may also be implemented on a dual lumen catheter, such as a hemodialysis catheter, to reduce recirculation rate. Various device configurations and methods for such implementations are also disclosed.

The invention discloses a four-stage hierarchical control method for a tandem double-wind-wheel wind turbine generator, and belongs to the technical field of wind power control. Four-stage hierarchical control logic is adopted, and through a four-stage control framework of a single-wind-wheel control stage, a two-wind-wheel coordination control stage, a double-wind-wheel unit system control stage and a network source coordination stage, complete protection control logic is formed from a double-wind-wheel unit network source side to a unit side, a cooperative control side and a single-wind-wheel side in a layer-by-layer progressive mode. The four-stage hierarchical control aims at optimal unit output and lowest load and cooperatively controls double-wind-wheel output, so that the unit efficiency is higher, grid connection is more friendly, the wind energy utilization rate is increased, the kilowatt-hour cost of the wind turbine generator is greatly reduced, and the grid connection characteristic of the unit is improved.

A pressure sensor includes a casing formed with a first case and a second case that has a pressure introduction hole for introducing a measurement object, a pressure sensing portion in the casing and a metal diaphragm disposed between an end face of the first case and a reception face of the second case. The measurement object is introduced into a subspace that is formed as an expanded end of the pressure introduction hole in the second case for measurement of pressure by transmitting the pressure through the diaphragm to the pressure sensing portion, and the pressure sensing hole has an orifice that reduces a cross-sectional area of the pressure sensing hole.

The invention discloses a redox flow battery electrode plate frame runner. The redox flow battery electrode plate frame runner comprises an electrode plate frame body, a lower-part electrolyte flowingsharing passage and a flowing limiting runner and also comprises at least one flowing dispersing runner and a flow sharing flowing runner, wherein the lower-part electrolyte flowing sharing passage is arranged at the electrode plate frame body in a penetrating way, the flowing limiting runner communicates with the lower-part electrolyte flowing sharing passage, the sharing flowing runner is connected with a plurality of flowing allocation runners, one end of each of the plurality of flowing allocation runners is connected with the flowing dispersing runner, and the other ends of the pluralityof flowing allocation runners communicate with an electrode cavity. In the redox flow battery electrode plate frame runner proposed by the invention, gradual dispersing flowing to the electrode cavity is employed, an electrolyte simultaneously enters the electrode cavity from the plurality of flowing allocation runners and acts with a porous electrode material, the redox flow speed is reduced, the uniformity of redox flow in the electrode material is improved, full contact of the electrolyte and the electrode material is improved, the surface utilization ratio of the electrode material is improved, the surface reaction polarization of the electrode is reduced, the internal current loss of the battery is reduced, the average power of a battery unit comprising the redox flow battery electrode plate frame runner can reach 300W or above, and the corresponding battery stack power can exceed 30kW.

The invention features an excavating device for excavating a hole in a geological formation, which excavating device includes:a body rotatable inside the hole along a rotation axis;a nozzle arranged on the body to jet a stream of an abrasive fluid onto a surface in the geological formation in order to generate the hole, wherein the stream has at least an radial velocity component and one parallel to the rotation axis. The excavating device further hasa distance holder arranged on the body to ensure a predefined distance between the nozzle outlet and the surface; whereinthe distance holder has a trumpet shaped inner surface section facing the geological formation, which trumpet shaped inner surface section is provided with an opening for allowing the stream to pass through.The opening in the trumpet shaped inner surface section is defined by a recess that is formed in the inner surface of the wall of the distance holder, whereby the nozzle is arranged to discharge in the recess. The invention also features a distance holder such as described above.

The invention discloses an aero-enginerectifier cover based on the Magnus effect. The autogyration rectifier cover is in a sphere shape. Prostrate crescent protrusions are arranged on the sphere anticlockwise. A mounting edge is arranged on the outer ring of the front end of an air inlet machine. A special-shaped rectifier supporting plate is welded to the front end of the air inlet machine. Holeswith stairs are formed in horizontal two ends of the autogyration rectifier cover. The holes are self-lubricating bearing outer ring mounting seats. Stair shafts are arranged on the left and right sides of the air inlet machine in the horizontal direction of the autogyration rectifier cover. The shafts are self-lubricating bearing inner ring mounting seats. The autogyration rectifier cover is mounted on the air inlet machine through a self-lubricating bearing. A groove bearing mounting seat is arranged at the middle of the air inlet machine. A front fulcrum bearing is arranged in the bearingmounting seat and is locked by nuts. A sealing component is arranged at the front end of a low-pressure rotor in a sleeving mode. The low-pressure rotor is connected to the front fulcrum bearing. A low-pressure stator is arranged at the rear end of the air inlet machine. The structure is rational, and ice resisting and ice removing systems of the aero-engine can be omitted.

Disclosed is a master cylinder for a brake system. The master cylinder includes a cylinder body that has a bore therein; at least one piston provided in the bore to be moved forwards and rearwards; a liquid pressure chamber compressed by the piston; a brake liquid port that is connected to a reservoir and configured to supply brake liquid to the liquid pressure chamber; and a brake liquid discharge opening for discharging the brake liquid in the liquid pressure chamber to a wheel brake of a wheel. A valve unit that includes a check valve to control the unidirectional flow of the brake liquid that is introduced from the reservoir to the liquid chamber and a fluid resistance hole opened in two directions and is smaller than the size of the brake liquid discharge opening is provided in the brake liquid port.