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570 results about "Connection form" patented technology

In mathematics, and specifically differential geometry, a connection form is a manner of organizing the data of a connection using the language of moving frames and differential forms. Historically, connection forms were introduced by Élie Cartan in the first half of the 20th century as part of, and one of the principal motivations for, his method of moving frames. The connection form generally depends on a choice of a coordinate frame, and so is not a tensorial object. Various generalizations and reinterpretations of the connection form were formulated subsequent to Cartan's initial work. In particular, on a principal bundle, a principal connection is a natural reinterpretation of the connection form as a tensorial object. On the other hand, the connection form has the advantage that it is a differential form defined on the differentiable manifold, rather than on an abstract principal bundle over it. Hence, despite their lack of tensoriality, connection forms continue to be used because of the relative ease of performing calculations with them. In physics, connection forms are also used broadly in the context of gauge theory, through the gauge covariant derivative.

Drilling Tool Steering Device

ActiveUS20090166089A1Shorten the lengthReliable and economical to manufactureDrilling rodsDerricks/mastsRelative displacementDrive shaft
The invention concerns a drilling tool steering device, characterized in that it contains, consecutively from upstream to downstream, a main body (1) and a steerable housing (2), joined respectively by at least one connection of pivot, sliding pivot, ball joint or annular linear type forming a first bearing (4), and at least one pivot connection forming a second bearing (5), to a bendable or flexible transmission shaft (3) which crosses them longitudinally, while a connection of pivot, sliding pivot, annular linear or ball joint type forming a third bearing (6) between said transmission shaft and the main body (1) is arranged in proximity to the end of said main body situated in the direction of the steerable case, and while steering is carried out thanks to means acting as a deflection system (7) for the essentially radial relative displacement of the main body (1) in relation to the steerable housing (2) in proximity to their interface, the said main body being optionally equipped on its periphery with bearing pads (9) of diameter less than or equal to the diameter of the drilling tool/bit (16), and the said steerable case being optionally equipped on its periphery with bearing pads (10a) of diameter less than or equal to the diameter of the drilling tool/bit (16) toward its end situated in the direction of the drilling tool/bit, and with fixed or expandable pads or clamps toward its end situated in the direction of the main body (1). Application to boreholes necessitating trajectory control.
Owner:MILLET

Embedded stirring and rubbing slit welding method

The invention discloses an embedded stirring and rubbing slit welding method for dissimilar metals, which is especially suitable for large-area lap connection of aluminum or magnesium or harder metal materials. The embedded stirring and rubbing slit welding method comprises the steps of: firstly, processing one or more dovetail grooves on a second harder base material; secondly, assembling according to a lap connection form, and placing an aluminum plate on the upper sides of the dovetail grooves of the second harder base material; using a needle-free stirring head and installing in an inclining manner; starting the stirring head to rotate and enabling the stirring head to be in contact with the upper surface of the aluminum plate, wherein the pressing depth of the stirring head is limited to about between 0.1mm and 2mm and a welding interface needs not to be penetrated; after rubbing and preheating for several seconds at the starting end, moving the rotating stirring head or operating platform so that the aluminum plate is helically extruded in a groove of a lower plate and the welding or cladding is completed. Compared with the resistance slit welding, the method disclosed by the invention has remarkable energy saving advantage. Compared with the traditional stirring rubbing welding, the method disclosed by the invention has the advantages of no keyhole and no abrasion to needles by the harder base material. The method can be used for welding, and can also be used for preparing a bimetal composite plate.
Owner:西安英特金属复合材料有限公司

Continuously heating and defrosting heat pump type air conditioner

InactiveCN101476801AEnsure continuous heating needsGuaranteed heating conditionsCorrosion preventionCompression machines with reversible cycleVapor–liquid separatorFour-way valve
The invention provides an uninterrupted heating-defrosting heat-pump type air conditioner, which comprises a compressor, a four-way valve, an outdoor heat exchanger, an indoor heat exchanger, an electric refrigerant heater and a gas-liquid separator, wherein the four-way valve is communicated with one end of the outdoor heat exchanger; an outdoor electronic expansion valve is arranged between the other end of the outdoor heat exchanger and one end of the indoor heat exchanger; a first check valve, a capillary tube and a first electromagnetic valve, which are in sequential serial connection, form a first circuit branch; one end of the first circuit branch is communicated with a pipeline between the other end of the outdoor heat exchanger and the outdoor electronic expansion valve; the other end of the first circuit branch is communicated with the pipeline between the other end of the indoor heat exchanger and a fourth interface of the four-way valve; a second electromagnetic valve and a second check valve in serial connection form a second circuit branch; one end of the second circuit branch is communicated with the pipeline between the outdoor electronic expansion valve and one end of the indoor heat exchanger; and the other end of the second circuit branch is communicated with the pipeline between a third interface of the four-way valve and one end of the gas-liquid separator. The air conditioner has the characteristics of stable indoor heating effects and thorough defrosting.
Owner:CHONGQING MIDEA GENERAL REFRIGERATING EQUIP

District air-conditioner distributed secondary pump system

The invention aims to provide a district air-conditioner distributed secondary pump system, which comprises refrigeration main engines 1, chilled water primary pumps 2, a water segregator 3, a water collector 4, and a profit and loss tube 5. According to the invention, in the two forms of an indirect connection 1 and an indirect connection 2, a chilled water secondary pumps 6, plate heat exchangers 7, user chilled water circulating pumps 8, and user tail end air processing devices 9 are mainly arranged on a user side; in the direct connection form, the chilled water secondary pumps 6, the user tail end air processing devices 9, and a bypass pipe 10 of a secondary pump suction inlet with a control valve are mainly arranged in the user side. The invention also provides a connecting form of distributively arranging the secondary pumps to a chilled water distribution system of each user building, and a corresponding operation control method. The system can well realize the hydraulic equilibrium of each paralleled loop circuit of a district cooling system transmission and distribution network, improves the operation efficiency of the secondary pumps, and greatly reduces the water pump energy consumption, thereby improving the energy efficiency ratio of the overall system, and increasing the safety of the overall district cooling system.
Owner:南京市建筑设计研究院有限责任公司
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