573results about How to "Increase the circulation area" patented technology

A device for regulating blood pressure between a patient's left atrium and right atrium comprises an hourglass-shaped stent comprising a neck region and first and second flared end regions, the neck region disposed between the first and second end regions and configured to engage the fossa ovalis of the patient's atrial septum; and a one-way tissue valve coupled to the first flared end region and configured to shunt blood from the left atrium to the right atrium when blood pressure in the left atrium exceeds blood pressure in the right atrium. The inventive device may include a biodegradable material that biodegrades to offset flow changes caused by tissue ingrowth. The inventive device may reduce left atrial pressure and left ventricular end diastolic pressure, and may increase cardiac output, increase ejection fraction, relieve pulmonary congestion, and lower pulmonary artery pressure, among other benefits.

The present invention discloses an icing wind tunnel hot gas anti-icing test high-precision simulation method and device. The device comprises a gas source, a pressure reduction device, a filter, an air heater, a multistage electric heating device and a test section in order from a gas input direction to a gas output direction. The gas path behind the pressure reduction device is divided into two paths, one path is heated and then is subjected to flow mixing with the other unheated path, a pneumatic switching valve in an icing wind tunnel plenum chamber is configured to divide the gas path into two paths, gas of one path enters a test section and flows out after passing through a test model to perform flow measurement, gas of the other path is flown through from the external portion of the test section and performs flow measurement, and gas of a model main path and gas of a simulation bypass path are combined into one path after passing through the wind tunnel test section and are exhausted through a flowmeter and a silencer; a cold and hot gas mixing mode is employed to rapidly reduce the high-pressure hot gas behind the air heater so as to reach the effect of rapid temperature adjustment; and the multistage electric heating device is employed to perform high-precision temperature regulation and control so as to perform high-precision temperature adjustment of high-pressure hot gas prior to the high-pressure hot gas entering a test model step by step.

The invention relates to low-moisture low-variable serial saturation tower thermal CO transformation technology, which comprises the following steps: after processing gas-liquid separation, heat exchange and detoxification to crude gas, feeding the crude gas into a pre-transformation furnace to process initial transformation reaction; controlling the mol ratio of crude gas water/dry gas which enters the pre-transformation furnace within 0.19-0.23, and controlling the temperature thereof within 200-220 degrees centigrade; feeding pre-transformed mixing gas from a crude pre-heater into a saturation tower and contact with technical circular water of a hot water tower reversely so as to transmit heat and quality; increasing humidity and temperature of the pre-transformed mixing gas, feeding into the pre-transformed mixing gas into an isothermal transformation furnace so as to process depth transformation; exchanging gas and heat of the isothermal exchange gas of the isothermal transformation furnace so as to feed into the hot water tower to transmit the heat and quality; and recycling low-order heat energy. Compared with the prior art, the isothermal transformation furnace substitutes at least two grades of heat isolating transformation furnaces; the number of transformation furnaces is reduced; equipment investment and catalyst cost are saved; in addition, a transformation procedure is short, resistance is small, energy consumption is low and operation is stable.

A check valve for a fuel pump of a vehicle includes a retainer adapted to be disposed in an outlet member of the fuel pump. The check valve also includes a valve seat adapted to be disposed in the outlet member and spaced from the retainer. The check valve includes a valve member disposed in the outlet member between the retainer and the valve seat. The valve member has a closed position to engage the valve seat to prevent fuel from flowing through the outlet member and an open position to allow fuel to flow through the outlet member. The check valve further includes a magnet cooperating with the valve member for generating a magnetic force on the valve member to maintain a contact force between the valve member and the valve seat when the valve member is in the closed position.

A compressor includes a normally open discharge valve assembly for controlling compressed refrigerant flow from the discharge chamber through the compression members. This controlling of flow results in an increased performance for the compressor by reducing recompression volume and the elimination of reverse rotation at shut down. The discharge valve assembly includes a valve seat, a valve plate and a valve stop secured within a recess formed within the compressor with a wave ring retainer. The valve stop and the valve seat include a contoured surface that is engaged by the valve plate when it opens and closes. The contoured surface controls the movement of the valve plate.

An optoelectrical device, which may be a luminaire or a photovoltaic concentrator, has a transparent cover plate. A target with an optoelectrical transducer that produces waste heat in operation is mounted at an inside face of the transparent cover plate. A primary mirror reflects light between being concentrated on the target and passing generally collimated through the cover plate. A heat spreader is in thermal contact with the target. The heat spreader has heat conductors that thermally connect the target with the inside surface of the cover plate. The heat conductors may be arms extending radially outwards, and may be straight, zigzag, or branching. An array of targets may be mounted on a common cover plate, and their heat spreaders may be continuous from target to target.

A modular and compact adsorbent bed structure is disclosed for use in an adsorption-based gas separation plant. The conventional adsorbent bed in a gas separation plant is replaced with a plurality of modular adsorbent bed units connected to make the adsorbent bed structure. Modular adsorbent bed units of this invention provide higher capacity of product per unit volume of adsorbent material (i.e., increased adsorbent utilization) as compared to that obtained from conventional adsorbent beds. The modular design requires lower fabrication costs; is easier to transport; has less maintenance and repair requirements; and is easier to load with adsorbent material.

The invention discloses a novel sand control screen pipe with adjustable on-site sand stop precision, and belongs to the field of oil well completion sand control. The novel sand control screen pipe mainly comprises five parts, namely a central pipe, a fixed-precision sand stop layer, an adjustable-precision sand stop layer, an outer protective sleeve and a sand stop precision precise adjusting mechanism, wherein the central pipe is provided with spirally distributed through holes and is mainly used for supporting the entire screen pipe and allowing oil to pass through; the fixed-precision sand stop layer is mainly used for controlling sand; the adjustable-precision sand stop layer can change the sand stop precision under the adjustment of the precise adjusting mechanism to play a major role in sand control; the outer protective sleeve is mainly used for protecting the internal structure of the screen pipe and reducing erosion effect of internal fluid and sand; and the sand stop precision precise adjusting mechanism is mainly used for adjusting sand stop precision of the adjustable-precision sand stop layer. Compared with the conventional sand control screen pipe with fixed sand stop precision, the adjustable-precision sand control screen pipe can realize on-site real-time design and sand stop precision adjustment aiming at the characteristics of a single well to improve the sand control effect; the novel sand control screen pipe is convenient for mass production of the screen pipe manufacturers and can precisely control the sand control precision; and the novel sand control screen pipe is convenient for screen pipe development, is convenient for suppliers to provide a sand control design, integrated service of the sand control screen pipe, and the like.

A unit-combination type heat transfer enhancement device of the invention relates to the field of the unit type heat transfer enhancement device which utilizes the fluid of a heat transfer pipe as the power, comprising rotors, a support frame, sleeve shafts and a connecting axis, wherein the support frame is fixed at the two ends of the heat transfer pipe; the two ends of the connecting axis are respectively fixed on the support frame; the centers of the sleeve shafts are through holes; a plurality of the sleeve shafts are arranged on the connecting axis in a penetrating manner; the rotors are arranged on the sleeve shafts in a penetrating manner; and one or more rotors is/are matched with one sleeve shaft. The rotor consists of flow-disturbing rotary vanes, a hinge structure and tail end spiral drive blades. The fluid in the pipe in the technical scheme drives the rotors to rotate at a proper speed by the tail end spiral drive blades, thus having the inhibiting and cleaning effects on the fouling deposit; the proportion of the length of the flat and straight part of the flow-disturbing rotary vane and that of the tail end spiral drive blades can be changed flexibly; and according to the practical needs, bulges are also arranged on the thin sheet of the edge to further disturb the fluid to flow, thus further improving the effects of the heat transferring and self cleaning.

An improved washer (10, 210, 710) having a quick fill (32, 34) and a quick drain (36, 38) with reduced overall wash time is provided. Means are provided for doing a very cold wash to permit machine washing of fine clothing that heretofore was hand washed or dry cleaned. The washer (10, 210, 710) can be provided with one (30), two (224, 230) or three tanks (750A, B & C, 950A, B & C) for water at three temperatures, very cold (refrigerated), tap or city water supply temperature, or hot water. The very cold can be made by a refrigeration or chilling means (62, 64, 98), located in or adjacent the very cold water tank. The hot water can be provided from or have a heater (230, 320, 750C, 950C) therein one of the tanks. The washer also includes an improved embossed basket (600) with increased surface area. The features can be built into a new washer or retrofitted into an existing washer. Very cold water wash and rinse can be provided so that cloths, and particularly clothes such as made of wool, rayon, acetate or other clothes, such as leathers or furs, usually dry cleaned or hand washed, can be machine washed with the present invention without use of hazardous chemicals or shrinkage.

The invention discloses a nozzle, an ejector based on the nozzle and having an adjustable flow characteristic, and application of the ejector. The nozzle comprises a nozzle body, a small nozzle, a large nozzle and an elastic part; a thin and long hollow pipe with a valve is adopted as the small nozzle, and the elastic part is arranged between the set of large nozzle and the set of small nozzle; one end of the elastic part jacks the valve part of the small nozzle, and the other end of the elastic part jacks the large nozzle; and the elastic part can change the position of the valve of the smallnozzle under the effect of to-be-ejected gas, and then a flowing path of the to-be-ejected gas is controlled. The supply quantities of hydrogen and recycled hydrogen are automatically controlled by the nozzle according to system loads; when the low load exists, the small nozzle acts, the pressure of a nozzle outlet is small, the recovery rate of the recycled hydrogen is high, and the hydrogen utilization rate is increased; when the medium-high loads exist, the two sets of nozzles act simultaneously, and the large nozzle is used for enlarging the circulating area to provide the larger fuel flow; and the small nozzle is used for increasing the ejecting speed to improve properties of the ejector.

The invention provides an air duct assembly and a refrigerator with the air duct assembly. The air duct assembly comprises an air duct body, an air duct cover plate, a fan and an air outlet baffle, wherein the air duct cover plate and the air duct body are connected to define an air duct, an air outlet is formed in the air duct cover plate, the fan is arranged in the air duct, the air outlet baffle is connected with the air duct cover plate and can rotate between a first position where the air outlet is opened and a second position where the air outlet is closed, and the opening degree of the air outlet is in positive correlation with the rotating speed of the fan. According to the air duct assembly, the opening degree of the air outlet is in positive correlation with the rotating speed of the fan, when the fan operates at a low speed, the opening degree of the air outlet baffle is small on the premise of meeting the air supply requirement, and when the fan operates at a high speed, the opening degree of the air outlet baffle is large so as to enlarge the flow area of the air outlet and reduce the flow speed at the air outlet, and therefore noise under high rotating speed of the fan is lowered.

The invention relates to a system and a method for improving the uniformity of a selective catalytic reduction (SCR) flow field. The system comprises a flue, a plurality of circular arc-shaped primary guide plates, a plurality of circular arc-shaped secondary guide plates, an ammonia injection grid, N tertiary guide plates, a plurality of catalyst layers, and M sets of differential pressure measurement components which are horizontally arranged along the width direction of the flue and are positioned between the catalyst layers and the tertiary guide plates, wherein each set of differential pressure measurement component is evenly provided with N differential pressure detection devices arranged at intervals along the depth direction of the flue. The system and the method can improve the flue gas flow field in front of the catalyst layers, guarantees the speed uniformity of an SCR system, and effectively reduces the phenomenon that the catalyst layers are blocked or worn.

The invention discloses a flame tube structure of a thrust combustion chamber used for a supercharger test. The flame tube structure includes two parts, namely a flame tube outer casing (1) and a flame tube inner casing (2), and further includes functional structures such as an air film cooling tank structure (3), a nozzle swirler and a second-stage diffuser, wherein a main combustion zone (11), a mixture zone (12), a cooling transition zone I (13) and a cooling transition zone II (14) all of the flame tube inner casing (2) are connected with one another through the novel air film cooling tank structure (3) which is a curve rectangular hole provided with diversion trenches, and the proportion of the air inlet passage sectional area in the sectional area of the film cooling tank structure is larger; the proportion of the air circulation sectional areas of the four zones in the sectional areas of corresponding positions of the flame tube outer casing (1) is larger; and the thickness of both the flame tube outer casing (1) and the flame tube inner casing (2) is 4.5 mm. According to the invention, the structural strength of the flame tube is increased, the formation of carbon deposition is reduced, the economic efficiency of the fuel is improved, the heat dissipation effect of the wall of the flame tube is improved, and the tolerance temperature of the combustion chamber and the flame tube as a whole is improved.

The invention discloses a bigrid power MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor) device, belonging to the technical field of semiconductor power devices. According to the invention, on the basis of a common bigrid LDMOS (Laterally Diffused Metal Oxide Semiconductor) device, by means of extending a drain-electrode contact area connected with drain-electrode metal to a place below an active layer to form a longitudinal drain-electrode contact area (12a) and introducing a layer of heavily-doped buried layer namely a transverse drain-electrode contact area (12b) connected with the lower end of the longitudinal drain-electrode contact area (12a) between the active layer and the substrate, a current conduction path is shortened; meanwhile, a bigrid structure is adopted to form a double-current channel, so that the current flow area is enlarged, and on-resistance and power consumption are reduced greatly; and compared with the devices with the same transverse dimensions, the device disclosed by the invention is slightly reduced in withstand voltage.

The invention discloses an array type muffer, the technical problems to be solved are to advance the silencing ability. The array type muffer is provided with an absorbing body in the tube, wherein the absorbing body is a tube provided with sound absorption material inside, the axis of the tube is arranged along the airflow direction in parallel, and the tube is fixedly arranged in the air pipe through the bracket. Compared with the existing technology, in the same length of the muffer, the absorption surface of the unit cross area is increased, the absorption property is advanced, the noise reduction effect is good, which ensures that in the same noise reduction effect, the length and the volume of the muffer are reduced, the air flow area of the unit cross area is increased, the flow velocity of the absorbing body is reduced, the air noise is reduced, the pressure loss is small, thereby reducing the pressure of the system fan, reducing the cost of the air system. The whole muffer is decomposed into each small absorbing body and the parts for installing the bracket, which is convenient for the transportation and installment.

The invention aims to provide a gas circuit axial grading type dual-fuel nozzle which comprises a gas circuit outer wall and a main oil circuit wall arranged inside the gas circuit outer wall. An auxiliary oil circuit wall is arranged inside the main oil circuit wall. A main oil circuit channel is formed between the main oil circuit wall and the auxiliary oil circuit wall. An auxiliary oil circuit channel is formed inside the auxiliary oil circuit wall. A gas circuit is formed between the gas circuit outer wall and the main oil circuit wall. The gas circuit comprises a gas circuit front cavity, a gas circuit laryngeal and a gas circuit rear cavity in sequential communication. A first level gas circuit gas ejection hole is formed in a position, arranged on the gas circuit front cavity, of the gas circuit outer wall. A laryngeal gas ejection hole is formed in the gas circuit laryngeal. A second level gas circuit gas ejection hole is formed in the gas circuit rear cavity. Due to the fact that a gas circuit axial grading type structure is adopted, the gas circuit axial grading type dual-fuel nozzle has the advantages of reducing the radial size of the nozzle, simultaneously increasing gas circuit flow area, enhancing mixing of fuel and air, strengthening burning, shortening flame, and simultaneously not burning the wall surface of a flame tube. When liquid fuel is burned, water vapor reinjection is conducted by the gas circuit.