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3347 results about "Closed cavity" patented technology

Electronic Device And Rear-View Device

An improved rear-view device for a motor vehicle includes an electronic device with at least one housing device, comprising at least one floor piece and a cover piece configured to be arranged on the floor piece. The floor piece and the cover piece, in the joined state, delimit an at least almost completely closed cavity. At least one first retaining means of a retaining unit, fixes the housing device in or on the rear-view device. At least one electronic module comprises at least one conductor unit and at least one contact means connected with the conductor unit. The conductor unit is arranged on a surface of the floor piece and/or cover piece and turned towards the cavity. The conductor unit comprises at least one carrier and at least one conductor track applied directly to the carrier. The contact means extends through the cover piece and/or through the floor piece with at least one protruding contact section and is accessible externally. The at least one carrier of the at least one conductor unit is formed at least in sections by a functional surface of the floor piece and/or the cover piece adjacent to the cavity and turned towards the cavity. The cover piece and/or floor piece forms a common component with the at least one first retaining means of the retaining unit.
Owner:SMR PATENTS S A R L

Test Device And Test Method For Active Noise Reduction Headphone

The present invention discloses a test device and test method for the noise reduction headphone. The test device comprises: an enclosed cavity, a noise source, a test panel, a measuring microphone and a measure comparison module connected with the measuring microphone. The sound emitted from the noise source is sealed within the enclosed cavity. The test panel can cooperate with the noise reduction headphone to form a coupling cavity in the test. The test panel has a sound guiding hole in the common part with the enclosed cavity for transmitting the sound of the noise source into the interior of the coupling cavity. The test panel also has a mounting hole, and the measuring microphone is mounted on the mourning hole towards the direction of the coupling cavity. The measuring microphone records noise signals before and after the noise reduction function of the noise reduction headphone is activated. The measure comparison module receives the signals recorded these two times by the measuring microphone and performs comparison processing to obtain noise reduction amount of the noise reduction headphone. The technical solution of the present invention solves the problem of noise pollution caused by high-power external noise sources to the surrounding environment during the test process of noise reduction amount of the headphone, meanwhile, no special shielding room is required, and the requirement on test environment is relieved.
Owner:GOERTEK INC

Silent range hood

The invention discloses a silent range hood comprising a machine enclosure and an exhaust fume collecting hood with an air inlet, wherein a spiral casing is arranged in the machine enclosure and is provided with a front air inlet and a back air inlet. The silent range hood is characterized in that a sound absorption flow guide hood is arranged on a front cover plate of the machine enclosure and is just opposite to the front air inlet of the spiral casing, a closed cavity is formed between the sound absorption flow guide hood and the front cover plate of the machine enclosure, a plurality of first micro-pores communicated with the closed cavity are formed in a back panel, opposite to the front air inlet, of the sound absorption flow guide hood, and the closed cavity is filled with first sound absorbing cotton. According to the invention, the sound absorption flow guide hood is just opposite to the front air inlet of the spiral casing and is provided with the micro-pores and the closed cavity is filled with the sound absorbing cotton, so that most of low-frequency, medium-frequency and high-frequency noise radiated outwards from the front air inlet can be absorbed; by reasonable selections of the aperture and the center distance of the micro-pores and the filling area of the sound absorbing cotton, the sound absorbing effect can be further strengthened.
Owner:NINGBO FOTILE KITCHEN WARE CO LTD

Protective energy-saving hood of pressure cooker

The invention provides a protective energy-saving hood of a pressure cooker.The protective energy-saving hood of the pressure cooker comprises a housing 2 arranged on a cooker cover 1 in a sleeving mode and composed of shells 3 and side encircling sleeves 4; the shells 3 and the side encircling sleeves 4 are both made from plastic cement; the side encircling sleeves 4 are closely matched with the shells 3 and sealed to the cooker cover 1; each shell 3 is provided with a clearance groove 22, a valve position hole 21 and other clearance hole grooves, and the lower end faces of the clearance hole grooves are sealed to the surface of the cooker cover 1; a closed cavity 23 is defined by the housing 2 and the cooker cover 1; the peripheral edge of the upper end of each valve position hole 21 is not higher than the lower edge of a cap hole 12; the inner side wall of each shell 3 is provided with a liner 5 made from foaming plastic cement.The protective energy-saving hood is used on the pressure cooker cover in a matched mode and has the safety protection effect and the energy-saving and heat-preserving effects, cooking of the pressure cooker can be made convenient, and the protective energy-saving hood facilitates energy conservation and emission reduction, so that the protective energy-saving hood has application and popularization value.
Owner:戴梦云

Amorphous alloy diecasting equipment and amorphous alloy diecasting process

The invention discloses an amorphous alloy diecasting equipment and an amorphous alloy diecasting process. The amorphous alloy diecasting equipment comprises a fixed die, a movable die, a sealed bin, a protection-gas supplying device, a melting container, a pressing and ejecting cylinder, a driving device and a harmful-gas purifying device; the fixed die and the movable die can be opened and closed, and a die cavity is formed between the fixed die and the movable die in a defining way when the fixed die and the movable die are closed; a sealed chamber is formed in the sealed bin in a defining way, and the sealed bin is provided with a feeding opening; the protection-gas supplying device is connected with the sealed chamber and used for supplying a protection gas to the sealed chamber, wherein the protection gas in the sealed chamber is at positive pressure; the melting container is arranged in the sealed bin; the pressing and ejecting cylinder is communicated with the die cavity and provided with a melt inlet; the pressing and ejecting cylinder is internally provided with a pressing and ejecting piston used for ejecting the melted amorphous alloy into the die cavity; and the harmful-gas purifying device is connected with the sealed chamber and used for purifying the harmful gas in the sealed chamber. The amorphous alloy diecasting equipment disclosed by the embodiment of the invention has a simple structure, adopts the protective gas at positive pressure, does not need to establish a high vacuum degree and has low manufacturing and maintaining cost.
Owner:BYD CO LTD

Shoe with elastic sole

A shoe with elastic sole is disclosed. The shoe comprises an inner sole, an outer sole, an upper, and an elastic sole comprising a U-shaped cavity that has openings at the two lateral sides of the sole and a U-shaped spring pad made of carbon fiber plate provided in the cavity and between the inner sole and outer sole forming a highly elastic sole structure. A U-shaped spring tab is added to the core of the U-shaped portion of the U-shaped spring pad. Alternatively, the openings of the cavity at the two lateral sides of the sole can be closed, forming a totally enclosed cavity structure. Additionally, another U-shaped cavity with a U-shaped spring pad can be provided in the anterior portion of the sole, thus forming a sole structure with U-shaped spring pads both in the anterior and heel portion of the sole. A ventilation structure is provided between the inner sole and the outer sole. The vent structure comprises ventilation holes in the lateral and rear sides of the U-shaped cavity with check intake valves provided therein, and a ventilation hole in the front side of the U-shaped cavity with a check exhaust valve provided therein. The shoe has the advantages of large deformation and high elasticity during use that can provide comforts and forced ventilation with its simple structure that is suitable for manufacture by the footwear industry.
Owner:WANG GUOHUA

Preparation method of titanium-steel single-sided composite board

ActiveCN102773254AReasonable process designLow requirements for welding conditionsMetal rolling arrangementsLayer removalTechnical design
The invention discloses a preparation method of a titanium-steel single-sided composite board, comprising the following processing steps of: (1) respectively selecting two titanium plates with same size and two steel plates with same size and carrying out rust and oxide layer removal treatment on the surfaces of the plates; (2) assembling to form multiple layers of symmetrical combined blank sequentially including a steel plate, a transition layer, a titanium plate, a parting agent, a titanium plate, a transition layer and a steel plate, wherein a gap exists between the periphery of the titanium plate and a barrier strip in the combined blank; (3) compressing the combined blank and respectively welding the barrier strip with a first steel plate and a second steel plate to form a closed cavity among the first steel plate, the second steel plate and the barrier strip, drilling holes in the barrier strip and welding a steel tube in the holes, and communicating the steel tube and the closed cavity; (4) conveying the combined blank into a heating furnace to heat and vacuumizing; (5) sealing the outer end of the steel tube and then conveying the combined blank into a rolling mill; and (6) cutting the combined blank after rolling to obtain the titanium-steel single-sided composite board. The preparation method disclosed by the invention is rational in technical design and low in production cost.
Owner:河南盛荣金属复合新材料有限公司

Supercritical carbon dioxide fracturing simulation experiment device

The invention discloses a supercritical carbon dioxide fracturing simulation experiment device. The device is characterized in that a pressure chamber, a vacuum saturation system and a carbon dioxide phase state transformation system are included; the pressure chamber comprises a closed cavity, flat jacks and heating rods, wherein the closed cavity is composed of an upper cover plate, a confining pressure barrel and a pressure chamber base which are sealed through a seal ring, the four flat jacks are evenly distributed on the side wall of the confining pressure barrel, the upper cover plate and the pressure chamber base are each fixedly provided with one flat jack, and the heating rods are fixed to the pressure chamber base; the vacuum saturation system comprises a vacuum pump and a saturation hydraulic station; the carbon dioxide phase state transformation system comprises a carbon dioxide gas source, a cooling device and an injection pump, and carbon dioxide is liquefied by lowering the temperature and then transformed to be in a supercritical state through pressurizing and temperature increasing. According to the supercritical carbon dioxide fracturing simulation experiment device, a supercritical carbon dioxide fracturing simulation experiment is conducted on rock and an artificial test piece under the saturated pore pressure condition, the parameters such as the injection pressure, the temperature and the output volume of fracturing fluid in the fracturing process are monitored in real time, a fracture extension rule is acquired, and the device is an experimental platform for researching the supercritical carbon dioxide fracturing mechanism.
Owner:CHINA UNIV OF PETROLEUM (BEIJING)

Simulation test system of coal-gas outburst during rock cross-cut coal uncovering

The invention discloses a simulation test system of coal-gas outburst during rock cross-cut coal uncovering, comprising a box provided with an opening at the top thereof, wherein the opening is equipped with a loading steel plate; a top plate and a bottom plate are paved in a closed cavity; a coal layer is paved between the top plate and the bottom plate; a slant angle is formed between the coal layer and the horizontal plane; an outburst simulation roadway is stretched in the bottom plate till being intersected with the coal layer; a notch attached to the coal layer is arranged at the intersection of the outburst simulation roadway; a diaphragm is arranged at the notch; an outburst opening and a gas balance opening are arranged at a part of outburst simulation roadway, which is exposed out of the box; the outburst opening is provided with a quick-opening seal structure; the gas balance opening is communicated with an air pressure tank; surface inflatable structures are respectively arranged on the contact surface of the coal layer and the top plate as well as the contact surface of the coal layer and the bottom plate; and the surface inflatable structures are communicated with a gas pressure tank. According to the invention, a mechanical release-diaphragm rupture method is adopted to ensure that the whole-process simulation of the coal-gas outburst during the rock cross-cut coal uncovering is realized.
Owner:SHANDONG UNIV OF SCI & TECH

Anisotropic two-dimensional visual sand filling model in simulation layer and two-dimensional visual seepage experimental device

InactiveCN105096719AGuaranteed fluid exchangeDoes not cause migrationEducational modelsEngineeringPressure data
The invention discloses an anisotropic two-dimensional visual sand filling model in a simulation layer and a two-dimensional visual seepage experimental device. The two-dimensional visual sand filling model includes a bottom board and a cover board. The bottom board and the cover board are both made of transparent material. The surfaces of the bottom board and the cover board are in sealing fit and a sealing rubber pad is arranged between the bottom board and the cover board. A cavity between the sealing rubber pad and the cover board is an enclosed cavity and a cavity between the sealing rubber pad and the bottom board is a filling cavity. The bottom board is provided with three sand filling grooves in parallel. The sand filling grooves are arranged in the width direction of the bottom board. One end of the three sand filling grooves is provided with liquid inlets while the other end of the three sand filling grooves is provided with liquid outlets. According to the invention, the two-dimensional visual seepage experimental device includes a pressure providing module, a pressure data collecting module, an image collecting module, an injection module, the two-dimensional visual sand filling model and a metering module. When using the model and the experimental device provided by the invention, core sandstone particles or quartz sand particles of different particle sizes are put into the sand filling grooves, so that permeability difference is formed among different layers. Therefore, different anisotropic oil deposit can be simulated by different sand filling combinations.
Owner:CHINA NAT OFFSHORE OIL CORP +3

Bionic petaling sampler

The invention relates to a bionic petaling sampler, which comprises a sleeve extending rod, a sliding shaft, six petaling sampling claws, a spring, a motor, a gear rack and a hinge base, wherein the motor is arranged on a motor base on the extending rod; the extending rod is provided with a hinge hole; petaling hinge handles of the sampling claws are connected with the hinge base at the lower end of the sliding shaft; the spring is connected with a petaling hinge handle spring hanger and a sliding shaft head hanger; when the bionic petaling sampler is used for sampling, the motor is controlled to rotate forwards and backwards to drive the sliding shaft to move up and down by the gear rack; the sliding shaft moves upwards when the motor rotates backwards so as to drive the sampling claws to move upwards and fold up and close under the resisting pressure of a sleeve; in the closing process, the sample is collected to a closed cavity formed by the six petaling sampling claws by the joint clamping and shoveling of the claws; and when the sliding shaft moves downwards, the sleeve release the resisting pressure, the spring is released and the sample falls off. The sampler has simple structure, less power consumption, is conveniently controlled, and can be used for detecting and sampling the moon and other planets or used for sampling in the environment which is unsuited for manual operation.
Owner:CHINA UNIV OF GEOSCIENCES (WUHAN)
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