61results about How to "Small thermal hysteresis" patented technology

The invention, which belongs to the sounding apparatus technology field, relates to a flexible and transparent thermotropic sounding apparatus. The apparatus comprises a sound element and a signal input device connected with the sound element. The sound element includes a flexible and transparent substrate; and at least one conductive film structure and a pair of electrodes or multi-pair electrodes are arranged on the substrate, wherein one ends of the pair of electrodes or the multi-pair electrodes are connected at two sides of the conductive film structure. And an input terminal of the signal input device is connected with the other ends of the electrodes. Therefore, the conductive film structure changes density of surrounding mediums to emit sound waves. According to the invention, there is no mechanical oscillation on the sound element itself and the sound element is transparent and can be bent and stretched. The thermotropic sounding apparatus can generate high sound pressure output within a frequency range of from 101 kHz to 100 MHz as well as has advantages of high reliability, flexibility, transparency, low cost, and high performance; besides, the apparatus can be integrated with a display screen and simultaneously enables sounding and display functions to be realized. Therefore, the provided apparatus can be widely applied to electronic fields like a mobile phone, a MP3, a MP4, a television, a computer, ultrasonic imaging, and a range finding system and the like.

The invention relates to a plane heat source, comprising a heating element and at least two electrodes which are arranged at intervals and electrically connected with the heating element, wherein the heating element comprises a substrate and a plurality of carbon nano tubes which are mutually wound and distributed in the substrate; and the carbon nano tubes in the heating element form at least a self-supporting carbon nano tube film. The plane heat source can be used for producing self-heating clothes, gloves or shoes, electric heaters, infrared therapy apparatuses, electric radiators and thelike and has wide application range.

The invention discloses an instant electric water heater; a vertical shunting clapboard is arranged in the middle part between the front and back sides of a box body to form a first cavity and a second cavity, a group of stream guidance holes are arranged at top part of the shunting clapboard, a group of stainless steel thermal energy pipes are uniformly distributed in the first cavity and the second cavity horizontally or vertically, and ports of the stainless steel thermal energy pipes are welded with the corresponding side plates of a box body in a penetrating way, a group of carbon fiber far infrared heating tubes are respectively arranged in the group of the stainless steel thermal energy pipes and are fixed by fixed clamping plates, a power supply input end of each carbon fiber far infrared heating tube body is electrically connected with an automatic thermostat by a wiring groove circuit board. the instant electric water heater has rapid heating, low power consumption, high hotwater yield, high electric-heating conversion efficiency, good safety and long service life and is energy saving and environmental protection.

The invention discloses a linear heat source, which comprises a linear substrate, a heating layer arranged on the surface of the linear substrate, and two electrodes arranged on the surface of the heating layer at intervals, wherein the two electrodes and the heating layer are electrically connected respectively; the heating layer comprises a carbon nanotube layer; and the carbon nanotube layer comprises a plurality of carbon nanotubes which are intertwined and disorderly arranged.

The invention relates to a hair dryer with a noise reduction function. The hair dryer comprises a housing, a housing cover and a motor, the housing cover is jointly arranged on the right side of the housing, an installation supporting frame is fixedly connected with the interior of the right side of the housing, a noise reduction plate is fixedly installed on the left side of the installation supporting frame, an installation plate is fixedly connected with the left side of the noise reduction plate, a motor is fixedly installed on the installation plate, fan blades are fixedly connected withthe output end of the motor through a rotary shaft, a heating tube is fixedly installed on the left side of the fan blades in the housing, a fixing ring is fixedly connected with the left side of theheating tube in the housing, a plurality of bamboo carbon strips and far infrared ceramic strips are fixedly connected in the fixing ring, and a plurality of air outlet pipes are arranged on the lowerside of the left end of the housing. The hair dryer has health caring, sterilizing, hair protecting and dust removing functions, hair can be combed while hair is blown dry, and the heat efficiency ofthe heating tube of the hair dryer is higher.

The invention discloses a novel method and a novel device for detecting the evaporation loss of lubricating oil and provides a flexible heating body for replacing a 'Wood's alloy' heating body mode adopted in the conventional Noack method. The device for detecting the evaporation loss of the lubricating oil adopted in the invention comprises the flexible heating body, a ceramic flat plate heating body, an evaporation boiler, a sealing cover, a sensor inserting device and a temperature sensor, wherein the boiler bottom of the evaporation boiler tightly contacts the ceramic flat plate heating body, a side wall of a shell of the evaporation boiler is wrapped by a layer of the flexible heating body, and the top of the evaporation boiler is provided with the sealing cover; the sealing cover is provided with the sensor inserting device; and the temperature sensor is inserted into or pulled out of the evaporation boiler from the sensor inserting device. The novel method and the novel device solve the problem of pollution generated during the detection, reduce damages to natural environment and human bodies and reduce detection cost.

The invention relates to a sound-generating device, comprising a sound-generating component and a signal input device, wherein the sound-generating component comprises at least a carbon nano tube line shaped structure, and the signal input device inputs a signal to the carbon nano tube line shaped structure to ensure the carbon nano tube line shaped structure to change the density of the surrounding medium to send out sound waves. The sound-generating device can be used in the earphones, sound boxes, radios and the like.

The invention discloses a high-stability length expansion die quartz temperature sensor provided with non-contact electrodes and relates to the field of sensors. The sensor comprises a packaging bodyand a resonance component located in the packaging body, wherein the resonance component is made of a quantity crystal; and the resonance component is of an integrated structure and comprises a base with two I-shaped beams, a supporting frame, m comb pieces and n resonance arms, wherein the m comb pieces and the n resonance arms are located in the supporting frame, m and n are both positive integers, m is greater than n, and the quantity of the metal electrodes on the m comb pieces is 2n. A new structure of the multi-resonance-arm length expansion die quartz temperature sensor which is provided with the non-contact electrodes and can prevent and suppress leakage of resonance energy of the resonance arms is disclosed, a non-contact electrode structure which is made of a high-temperature-resistant and aging-resistant four-layer composite metal thin film is groped, therefore, the maximum working temperature can reach 300 DEG C or above, thermal hysteresis is lowered, and the long-term stability of the sensor is improved.

The invention discloses a carbon fiber cable applied to crude oil exploitation and transportation. The carbon fiber cable comprises a tensile core wire. A resin insulating layer is arranged outside the tensile core wire. The resin insulating layer is provided with a carbon fiber heating layer. A heat conducting insulating layer is arranged outside the carbon fiber heating layer. A silicon rubber insulating layer is arranged outside the heat conducting insulating layer. A bending resistance metal wire and an interference resistance shielding layer are arranged in the silicon rubber insulating layer. According to the invention, the carbon fiber cable has the advantages of small heat hysteresis, fast heating and uniform heating temperature; due to the advantages of carbon fiber, the oil field heating cable has the advantages of stable and reliable work performance and long service life, wherein the service life is more than 20 years; the electricity-heat conversion efficiency of the heating cable can be improved; a heating cable power supply device is simplified; the power supply voltage is reduced; the reliability of the heating cable and the control system can be improved; and a power supply transformer is saved.

The invention relates to an alloy magnetocaloric material for magnetic refrigeration at a room temperature as well as a preparation method and application thereof. A chemical general formula of the material is MnCo1-xTixGe, wherein x is 0.02 to 0.08; the atomic percentage of a manganese element in the material is 33.3 to 34.4 percent; the atomic percentage of a cobalt element is 32.8 to 33.3 percent; the atomic percentage of a titanium element is 0.6 to 2.7 percent; and the atomic percentage of a germanium element is 30.2 to 32.7 percent. During preparation, reactants are added into a vacuum electric arc furnace; the vacuum electric arc furnace is vacuumized to 10<4> Pa or below, and high-purity argon gas is introduced; samples are melted for 2 to 5 times repeatedly; samples are taken out and cooled, and then put into a high-temperature resistant quartz glass test tube for vacuumizing; the high-purity argon gas is introduced to clean the gas and then put into a furnace type box; and the samples are taken out and annealed to obtain a finished product. Compared with the prior art, the alloy magnetocaloric material disclosed by the invention is a secondary phase change material, and has the characteristics of small heat stagnation and large regulated temperature zones; moreover, the problem of the heat stagnation caused by a primary phase change material can be effectively avoided; and a preparation process has simple steps, the condition controllability is good, and the material has good application prospect.