34results about How to "Increase the length of the runner" patented technology

A MRF valve for non-linear flow channel mainly solves the problem that the magneto-rheological fluid conducts non-linear flow along the flow channel in the MRF valve. The MRF valve prolongs the flowing path length of the magneto-rheological fluid, improves the utilization rate of the magnetic line and increases the pressure difference of the controllable fluid of the magneto-rheological fluid under the same current intensity, thus achieving the aim of saving energy and reducing the size of the MRF valve. The technical scheme is to arrange a non-linear flow channel on the corresponding end surface of a positioning plate and a magnetic conductive disk. The MRF valve has advantages of simple structure, convenient manufacture and installation; the control range of the MRF valve is expanded without increasing the size of the MRF valve.

The invention discloses a chain interlaced microchannel structure, which includes a substrate and a microfluidic channel arranged on the substrate, and is characterized in that the microfluidic channel includes two microfluidic branch channels, and the two microfluidic channel The fluid branch channels intersect and separate periodically, and the two microfluid branch channels respectively form an intersection and a bifurcation at the mutual intersection and separation. In the microfluidic channel provided by the present invention, the curved microchannel is a periodically changing arc-shaped flow channel, which is smoothly connected by circular arcs of different radians. Two adjacent flow channels are symmetrical and cross at intervals. After crossing The runners are arranged in arcs. The cooling medium flows smoothly in the flow channel, and the coefficient of frictional resistance is small. The interleaving of the two microfluidic branch channels of each microfluidic channel causes the redevelopment of the thermal boundary layer at the leading edge of the flow channel, reducing the thickness of the boundary layer, and the regenerated inlet effect keeps the fluid in a developed state, improving heat dissipation The heat dissipation performance of the device.

The invention discloses a magneto-rheological valve structure with three-dimensional spiral liquid flow channels. The aims of lengthening the lengths of the magneto-rheological flow channels and obtaining the large differential pressure are achieved. A valve element part in the structure comprises an inner flow guiding cylinder and an outer flow guiding cylinder, a magnet exciting coil is arranged in the inner flow guiding cylinder, the outer flow guiding cylinder and a valve body are of circular ring shapes, the inner flow guiding cylinder, the outer flow guiding cylinder and the valve body are sequentially installed in a sleeved mode, an inner three-dimensional spiral liquid flowing groove and an outer three-dimensional spiral liquid flowing groove are formed in the outer circle of the inner flow guiding cylinder and the outer circle of the outer flow guiding cylinder, the spiral flow channels are formed by the inner three-dimensional spiral liquid flowing groove and the inner wall of the outer flow guiding cylinder and formed by the outer three-dimensional spiral liquid flowing groove and the inner wall of the valve body, oil inlet-outlet discs are arranged on the end faces of the inner flow guiding cylinder and the end faces of the outer flow guiding cylinder, two sets of oil holes are formed in each oil inlet-outlet disc, the oil holes are communicated with the inner three-dimensional spiral liquid flowing groove and the outer three-dimensional spiral liquid flowing groove respectively, the valve body is arranged in valve body end covers, and oil holes in the valve body end covers are communicated with the oil holes in the oil inlet-outlet discs in the valve body. The magneto-rheological valve structure has the advantages that the length of an electromagnetic rheological path is lengthened, the use rate of magnetic force lines is improved, energy is saved, and the size of a magneto-rheological valve is reduced.

The invention discloses a casing pipe type gas electric heating device. The device comprises a gas inlet, a gas outlet, a shell, an inner pipe, an outer pipe, an electric heating wire, fins, a heat insulation layer and other components; the casing pipe type structural design is adopted in the gas electric heating device, the spiral fins are arranged outside the inner pipe, the electric heating wire is wound on the outer surface of the inner pipe along a gap between two adjacent spiral fins, the outer pipe is arranged on the outer sides of the fins, a whole casing pipe is fixed in the shell, and the heat insulation layer is arranged between the outer pipe and the shell. A spiral winding gas flow way is formed between the spiral fins and the outer pipe, the gas flow way is prolonged, and the device is high in heating speed and uniform in gas heating; heated gas flows through the winding type flow way on the outer side of the inner pipe, is heated to a certain temperature and then is reheated through the inner side of the inner pipe, the wall temperature of the outer pipe is relatively low, meanwhile, the heat insulation layer is arranged between the shell and the outer pipe of the electric heating device, heat dissipation losses are reduced, and the heat efficiency of the device is improved.

The invention discloses a three-dimensional rotational flow magnetic gap magneto-rheological valve structure. The aims of lengthening an electromagnetic rheological fluid flowing path, improving the use rate of magnetic force lines, controlling the differential pressure of electromagnetic rheological fluid, saving energy and reducing the size of a magneto-rheological valve are achieved. According to the technical scheme, a valve element part in the structure comprises a center iron core, a spiral stopping ring and a sleeve, the center iron core, the spiral stopping ring and the sleeve are sequentially and concentrically installed in a sleeved mode to form a whole, a gap formed between the outer circle of the center iron core and the inner circle of the sleeve is divided by the spiral stopping ring into a spiral magneto-rheological liquid channel structure, a magnet exciting coil is arranged on the outer circle of the sleeve and arranged in a valve body, oil inlet-outlet discs are arranged on the end faces of the center iron core and the end faces of the sleeve, oil inlet-outlet holes in the oil inlet-outlet discs correspond to a spiral magneto-rheological liquid channel formed in the mode that the gap formed between the outer circle of the center iron core and the inner circle of the sleeve is divided by the spiral stopping ring, the valve body is installed in two valve body end covers, and oil holes in the valve body end covers are communicated with the oil holes in the oil inlet-outlet discs in the valve body. The three-dimensional rotational flow magnetic gap magneto-rheological valve structure has the advantages that the energy is saved, and the size of the magneto-rheological valve is small.

The invention provides a heat exchanger core for heat exchange of three or more fluids, and belongs to the technical field of heat exchange design. The heat exchanger core comprises n heat exchange plate groups and is formed by alternately stacking the n heat exchange plate groups which bear n heat exchange fluids; each heat exchange plate comprises a via hole heat exchange plate and a through hole heat exchange plate; each via hole heat exchange plate comprises a via hole matrix, two fluid via holes and a heat exchange flow channel machined on the via hole matrix through chemical etching; each through hole heat exchange plate comprises a cold plate and a hot plate, wherein the cold plate comprises a cold plate matrix, a fluid through hole and a heat exchange flowing channel machined on the cold plate matrix through chemical etching, and the hot plate comprises a hot plate matrix, a fluid through hole and a heat exchange flowing channel machined on the hot plate matrix through chemical etching; each heat exchange plate group comprises one or more cold plate or hot plates. The heat exchanger core for heat exchange of the three or more fluids has the advantages of being high in cooling efficiency and the like.

The invention discloses a motor casing with layered long flow channels, belonging to electrical mechanical equipment of a vacuum cleaner. The motor casing with layered long flow channels comprises a built-in vacuum motor, an inner casing with air holes, a square outer casing and an outer casing cover, wherein the inner casing is formed on one side; the square outer casing is arranged outside the inner casing and separated from the inner casing for a certain spatial distance; an air inlet is formed at the top of the outer casing cover and an air outlet is formed on one side of the outer casing cover; a lower-layer flow channel and an upper-layer flow channel are formed respectively in the outer casing and in the outer casing cover by a lateral partition; an up channel is formed on the lateral partition opposite to the air outlet in direction; an air inlet channel is formed between the air inlet of the outer casing and the air inlet of the motor; and a space dividing cover on which muffling holes are formed is arranged in the upper-layer flow channel on the periphery of the motor in the outer casing cover. Because the motor casing with layered long flow channels is designed such, based on the original double-layer motor casing with a long flow channel, the limited space in the upper-layer flow channel is fully used, and the space dividing cover with muffling holes is additionally arranged, thereby further increasing the length of the upper-layer flow channel and further reducing noise.

A helical vane counter-rotating double-runner water turbine, including a diffuser section, a square-circle gradient section connected with the diffuser section, a casing connected with the square-circle gradient section, and a tailwater section connected with the casing, and a front section arranged in the casing The runner and the rear runner; wherein, the front runner and the rear runner respectively include an inner cylinder, a helical blade with a double helix structure arranged on the inner cylinder, and an outer cylinder provided with the outside of the helical blade, and the inner cylinder , the spiral blade, and the outer cylinder are of an integrated structure and jointly rotate around a fixed shaft arranged inside the shell, and the rotation direction of the front runner is opposite to that of the rear runner. The invention adopts a two-stage structure design, which has a longer flow channel to reduce the pressure gradient in the flow channel; the front and rear runners rotate in reverse to eliminate the rotational flow state; the inner cylinder, spiral blade, and outer cylinder are integrated structures Prevent cavitation between the blade and the outer cylinder, reducing the probability of mechanical damage to fish.