11results about How to "Improved thermal isolation" patented technology

The invention discloses a lightweight high-strength power cable based on a composite material and application thereof, belongs to the technical field of cable preparation, and aims to solve the technical problem that the lightweight and anti-electromagnetic interference performance of a lightweight cable in the prior art needs to be further improved. The cable comprises a conductor layer, a light shielding layer, a wrapping layer and a composite sheath layer which are sequentially arranged from inside to outside, modified carbon spheres are introduced into a titanium dioxide aerogel structure for filling and loading copper particles, obtained composite aerogel serves as a filling material of the light shielding layer, the modified carbon spheres serve as a cross-linking agent and a filling material of light polyurethane, and the light shielding layer and the composite sheath layer are formed. The composite aerogel and the lightweight polyurethane significantly reduce the density of the cable and significantly improve the lightweight performance of the cable, and through the synergistic cooperation of the copper particles, the titanium dioxide aerogel structure and the hollow carbon spheres, the anti-electromagnetic interference performance of the material is significantly improved.

The invention is suitable for the technical field of aero-engines, and provides a venturi tube structure, a swirler and a combustion chamber, the venturi tube structure comprises a venturi tube outer layer and a venturi tube inner layer, the venturi tube outer layer is provided with a containing cavity, a plurality of first protrusions are arranged on one side of the venturi tube inner layer in the circumferential direction at intervals, and a plurality of second protrusions are arranged on the other side of the venturi tube inner layer in the circumferential direction at intervals; the venturi tube inner layer is embedded in the containing cavity, the multiple first protrusions abut against the inner wall of the containing cavity so that a first cavity can be formed between the venturi tube outer layer and the venturi tube inner layer, and the multiple second protrusions abut against the inner wall of the containing cavity so that a second cavity can be formed between the venturi tube outer layer and the venturi tube inner layer; the first cavity and the second cavity are mutually independent and are used for preventing high temperature from being directly transmitted to the inner layer of the venturi tube. By means of the core structure design of the double-layer tube body and the independent cavities, the first cavity and the second cavity which are independent of each other are formed between the two tubes, direct conduction of high temperature from the outer layer of the venturi tube to the inner layer of the venturi tube is blocked by means of the air heat insulation characteristic, and the carbon deposition restraining effect is remarkable.

The utility model relates to the technical field of mobile power supplies, in particular to a power bank which comprises a columnar shell, a circuit board assembly, a winding disc and a columnar battery cell are sequentially arranged in the columnar shell in the axial direction, and the winding disc, the columnar battery cell and the columnar shell are coaxially arranged; a data line fixing groove is formed in the side portion of the columnar shell in the circumferential direction, and a cable access hole is formed in one side of the data line fixing groove; according to the utility model, the internal structural layout of the power bank is optimized through the layout mode of the columnar shell, the axial layering and the coaxial structure, and the space utilization rate is improved. According to the design, a larger mounting space is provided for the battery cell, the capacity of the battery cell is favorably improved, and the cruising ability of a product is further enhanced; meanwhile, the winding disc is arranged between the circuit board assembly and the battery cell, the physical heat insulation effect is achieved, the heat influence on the circuit board assembly when the battery cell works is reduced, the stability of a circuit system is guaranteed, and the use safety of a product is improved.

The invention provides a micro-thermal on-chip acoustic wave phase modulator, which belongs to the technical field of signal processing and comprises a substrate, a piezoelectric film and a micro heater. Wherein the piezoelectric film is arranged on the substrate, and the piezoelectric film is a lithium niobate film, a lithium tantalate film, an aluminum nitride film, an aluminum scandium nitride film or a gallium nitride film; the micro heater is arranged on the piezoelectric film; a cavity is formed between the substrate and the piezoelectric film, and the projection of the micro heater on the substrate in the height direction is located in the cavity. According to the micro-thermal on-chip sound wave phase modulator, effective phase modulation of incident sound waves is achieved through the thermo-acoustic effect of the lithium niobate thin film, and it is ensured that the heating temperature can be well limited in a modulation area based on the good thermal isolation performance and the low thermal capacity of the suspended thin film device; the excitation power consumption of the acoustic wave phase modulator is effectively reduced, and the response speed of the acoustic wave phase modulator is increased.

The present invention belongs to the technical field of isolated environment pressure monitoring, and discloses an isolated environment overpressure monitoring and measuring system, including a two-stage pressure monitor, which is installed outside the isolated environment and connected to the inside of the isolated environment; a cold nitrogen storage tank, which is connected to the two-stage pressure monitor for cooling the two-stage pressure monitor; a cooling water tank, which is connected to the two-stage pressure monitor for auxiliary cooling of the two-stage pressure monitor; the two-stage pressure monitor includes a primary pressure-guiding pipe and a secondary pressure-guiding pipe spliced ​​to each other through flanges. A temperature sensor 2 is provided on the secondary pressure-guiding pipe, which measures the temperature in the pressure-guiding chamber 2 by direct contact method, and cooperates with a control unit to monitor it in real time. When the temperature therein rises to outside the threshold range, the control unit drives the pump of the cold nitrogen storage tank to inject circulating cold nitrogen into the heat exchange chamber 3 provided on the secondary pressure-guiding pipe to accelerate heat exchange.

The invention relates to the technical field of optical communication, in particular to an optical chip capable of achieving thermal isolation and a manufacturing method of a micro-nano thermal insulation layer, and the optical chip comprises the micro-nano thermal insulation layer and a substrate; a chip working structure is arranged on the upper surface of the substrate, and the micro-nano heat insulation layer is arranged on the upper surface of the chip working structure. The micro-nano heat insulation layer is arranged on the upper surface of the chip working structure, the high porosity characteristic of the micro-nano heat insulation layer is utilized, the heat convection effect on the surface of the micro-nano heat insulation layer can be effectively reduced, the heat exchange capacity between the micro-nano heat insulation layer and the outside is reduced, the stress of the part is concentrated on the micro-nano heat insulation layer, the stress of the chip working structure is reduced, and the chip reliability is improved. The temperature difference between the upper surface and the lower surface of the working structure of the chip is reduced, so that the stability of the optical chip is improved, and the long-term working reliability and stability of the optical chip are improved.

The invention discloses a high thermal conductivity boron nitride-based interface material and a preparation method thereof, comprising the steps of: S1: coating a layer of silver on boron nitride powder; S2: mixing the treated boron nitride powder with graphene, nano silver particles and nano reinforcing agent to form a mixture 1; S3: dividing the mixture 1 into three parts according to a proportion and adding functional materials to form layer raw materials respectively; S4: mixing the layer raw materials with a silica gel matrix in a high shear mixer to ensure that each component is evenly dispersed; S5: pouring the layer raw materials mixed with the silica gel matrix into a honeycomb structure layered mold in sequence to form the first layer, the second layer and the third layer of the high thermal conductivity boron nitride-based interface material; S6: curing to form a honeycomb structure boron nitride-based interface material. The three-layer interface material structure formed by the self-healing microcapsule, the magnetic nanoparticle Fe3O4 and the metal aluminum foam of the present application not only improves the thermal conductivity, mechanical strength and flexibility of the interface material, but also greatly improves the service life.

The application relates to an Au / SnO2 / GND composite gas-sensitive material-based MEMS nitrogen dioxide sensor and a preparation method thereof, and belongs to the technical field of gas sensors. The sensor is composed of a metal tube seat and a MEMS micro-hot plate chip which are coaxially arranged and fixedly packaged, and the Au / SnO2 / GND composite gas-sensitive material is coated on the surface of the chip interdigital electrode. 3 The sp 2 Volume evolution during phase inversion is synchronous with the SnO2 crystallization process, the SnO2 shell and the carbon skeleton are tightly bonded at the atomic scale, lattice strain is induced at the heterojunction interface, and a high concentration of oxygen vacancies is generated; meanwhile, the ultraviolet photochemical reduction method is used to realize the fine and uniform dispersion of gold nanoparticles at a very low noble metal loading (0.5wt%-1.5wt%), and the high concentration of oxygen vacancies generated by the lattice strain constructs a double enhancement mechanism, which significantly improves the catalytic activity of the material and the sensitivity of the sensor.

The application provides an anti-corrosion and high-temperature-resistant railway signal cable, which comprises a plurality of cable core assemblies and a sheath assembly, any one of the plurality of cable core assemblies comprises a plurality of cable cores, the cable core comprises a conductor, an anti-corrosion layer and an insulation layer arranged in sequence from inside to outside, and the sheath assembly is arranged on the outer periphery of the plurality of cable core assemblies and comprises a wrapping layer, a heat insulation layer and an outer sheath structure arranged in sequence from inside to outside. In this way, the anti-corrosion layer arranged between the conductor and the insulation layer of the cable core improves the anti-corrosion capability of the cable. Meanwhile, the heat insulation layer arranged between the wrapping layer and the outer sheath structure of the sheath assembly can play a good thermal isolation role between the plurality of cable core assemblies wrapped by the wrapping layer and the external environment, so that the aging or failure of part of structures of the cable core assembly caused by long-term high-temperature work of the cable is avoided, the service life of the cable is improved, and the stability of signal transmission of the cable is ensured.

This invention discloses a mid-to-far-infrared narrowband light source for MEMS, comprising a substrate, a suspension support layer, a heating resistor layer, and a radiation functional layer. The substrate is a silicon substrate. The suspension support layer is fixed to the substrate by anchor points. The heating resistor layer is disposed on the suspension support layer, and the radiation functional layer is disposed above the heating resistor layer. The suspension support layer and the heating resistor layer have Y-shaped grooves forming a Y-beam suspension structure. The Y-beam suspension structure is connected to the substrate by anchor points to form thermal isolation. The surface of the radiation functional layer has a periodically arranged array of micro / nano structures. The period and size of the micro / nano structure array are on the same order of magnitude as the target infrared wavelength, forming an artificial interface with specific equivalent refractive index and resonance characteristics to achieve narrowband spectral output. This invention can reduce heat conduction from the radiation region to the substrate, reduce heat conduction loss, reduce heat leakage, improve thermal isolation performance, and reduce heat capacity, thereby enabling the beam to heat up and cool down rapidly.

The invention provides a surface acoustic wave thermal type gas flow velocity sensor, and belongs to the field of micro electro mechanical systems. The problems that a thermal MEMS sensor is large in time drift and temperature drift and is easily interfered by other physical fields are solved. The device comprises a surface acoustic wave device which is connected with a circuit board; the heating assembly is coupled with the surface acoustic wave device and provides initial temperature bias for the surface acoustic wave device; and the clamping assembly wraps the heating assembly and the surface acoustic wave device and is provided with an open part used for keeping the surface acoustic wave device in external contact with the clamping assembly, and the clamping assembly is used for keeping the heating assembly and the surface acoustic wave device in stable contact. The device is mainly used for detecting gas flow velocity.