14results about How to "Fast temperature response" patented technology

The present invention belongs to the technical field of ultra-precision cutting, and specifically relates to a diamond tool device. It includes: a diamond tool, a tool holder, wherein the diamond tool has: an electrode; a boron-doped single crystal diamond layer, whose resistance changes with the temperature after being heated, and is used to sense the temperature of the cutting micro-area; and a single crystal diamond layer, which is bonded to the boron-doped single crystal diamond layer through atomic interaction; the tool holder has: a body, which is internally provided with a temperature acquisition circuit board and a power supply, an upper cover plate, and is provided with a constant current source shift button electrically connected to the temperature acquisition circuit board; the electrode is connected to the temperature acquisition circuit board through a wire, and the cutting edge of the diamond tool is arranged on the single crystal diamond layer. Since the present invention has a boron-doped single crystal diamond layer, its resistance changes with the temperature after being heated, so that the temperature of the cutting micro-area can be sensed during the working process, and can be used for online measurement of the cutting area temperature during the single-point diamond turning process.

The invention provides a packaging device and method for compensating temperature unevenness of a super-long fiber bragg grating through thermal expansion, the packaging device comprises a packaging structural member composed of a duralumin lower sleeve and an invar upper sleeve, the fiber bragg grating is installed in U-shaped grooves formed in the duralumin lower sleeve and the invar upper sleeve, and the packaging structural member is installed in a metal shell. And the TEC is adhered to the bottom of the packaging structural member through a solidifiable curing adhesive. Based on the characteristic that the thermal expansion coefficients of duralumin and invar are greatly different, when the temperature is changed, the length of the invar part is basically not changed, and the duralumin part is changed in length, and different length changes can generate stress on the fiber bragg grating, so that the influence of uneven temperature on the wavelength of the fiber bragg grating is compensated; the stability performance of the central wavelength of the ultra-long fiber grating is improved, and the requirements of scientific research fields and related engineering applications are better met.

The application discloses a flexible multifunctional electromagnetic shielding film and a preparation method and application thereof. The electromagnetic shielding film comprises a carbon nanotube film, a high magnetic permeability layer and a high electrical conductivity layer combined with a first surface and a second surface of the carbon nanotube film respectively, and the electrical conductivity of the high magnetic permeability layer, the carbon nanotube film and the high electrical conductivity layer increases in turn, and the magnetic permeability decreases in turn. The application provides an electromagnetic shielding material with a three-layer structure. Due to the difference in the electrical conductivity and the magnetic permeability of the materials between the three layers, the electromagnetic wave experiences an 'absorption-reflection-reabsorption' process after entering the material, so that the material presents a low reflection characteristic. The Joule heating performance of the electromagnetic shielding film is good, the temperature response speed is fast when a voltage is applied, the stability of the electromagnetic shielding film during heating is excellent, the electromagnetic shielding film can remain stable for a long time, and the electromagnetic shielding film shows great application potential in the electromagnetic protection field and the thermal management field of high-integration electronic equipment.

Embodiments of the present application relate to an electronic device and a heat insulation module. The electronic device includes a housing, a sensing module, and a heat insulation module. The sensing module includes a circuit board and a sensing unit and a heating unit disposed on the circuit board. The heating unit is configured to heat the sensing unit. The heat insulation module is housed in the housing and includes a housing assembly and a heat insulation filler. The sensing module is housed in the housing assembly. The heat insulation filler is disposed between the circuit board of the sensing module and an inner wall surface of the housing assembly and contacts and covers the heating unit.

The present invention provides a metal film pressure core and a preparation method, which relates to the technical field of pressure sensor sensitive elements, so as to optimize the pressure core structure to a certain extent, improve the output sensitivity, zero temperature drift and sensitivity temperature drift of the pressure measuring bridge, and enhance the working temperature range and accuracy of the sensor. The metal film pressure core provided by the present invention includes an elastic substrate, an insulating layer, a compensation resistor, an alloy resistor, a silicon strain component, a connector and a lead; a pressure inlet is formed on the pressure-sensing side of the elastic substrate, the insulating layer is attached to the back pressure side of the elastic substrate, and the compensation resistor, the alloy resistor and the silicon strain component are all deposited on the insulating layer; the connector connects the alloy resistor and the silicon strain component to form a Wheatstone measuring bridge, one end of the lead is connected to the Wheatstone measuring bridge, and the other end is connected to an external signal processing circuit.

The application relates to a replaceable optical fiber monitoring cable and a replacement method thereof, and belongs to the technical field of optical fiber monitoring. Step one: when the optical fiber in the monitoring cable needs to be replaced, a part of the outer tube, the stainless steel wire layer and the inner tube at one end of the monitoring unit in the monitoring cable are peeled off in sequence, so that one end of the optical fiber unit to be replaced is exposed; step two: aramid yarn at one end of the exposed optical fiber unit to be replaced is peeled off, and the peeled aramid yarn and aramid yarn in the optical fiber unit to be installed are uniformly wound together, and the two are integrated; step three: the other end of the optical fiber unit to be replaced is uniformly pulled out, and the optical fiber unit to be replaced is uniformly wound on the take-up frame at a constant speed; the optical fiber unit to be installed is uniformly released through the pay-off frame at a constant speed, the optical fiber unit to be installed is pulled and introduced into the monitoring cable, and the replacement of the optical fiber is realized. The application can quickly replace the optical fiber, saves time and effort, and ensures that online monitoring can be continuously carried out during the use of the overhead cable.

This invention provides a fast-response fluid temperature sensor based on fiber optic sensing. The structure comprises three parts: a variable-diameter tube, a column, and a fiber optic temperature sensor. As the fluid enters the variable-diameter tube and transitions from a wider to a narrower section, Bernoulli's principle causes the pressure to decrease and the flow velocity to increase as the tube diameter narrows. This results in faster heat exchange at the fiber optic temperature sensor, thus accelerating the temperature response. In the fiber optic temperature sensor, a through-hole with wider ends and a narrower center is designed in the middle of the fiber. The fiber core is placed next to the through-hole, increasing the heat exchange area of ​​the sensor. Furthermore, Bernoulli's principle increases the fluid velocity at the narrower center, further accelerating heat exchange between the fiber optic temperature-sensitive element and the surrounding fluid, thus further speeding up the temperature response.

The invention provides an air conditioner control method and an air conditioner. According to the method, after a compressor is controlled to operate according to a PID control method, frequency change data of the compressor are recorded, whether the compressor enters a steady-state oscillation stage or not is judged according to the frequency change data, if yes, the compressor frequency in the steady-state oscillation stage is averaged, and the steady-state frequency fstep is obtained; and the frequency of the compressor is adjusted to be the steady-state frequency fstep for operation, so that frequent adjustment of the compressor is avoided, and energy consumption is reduced. In addition, due to the fact that the steady-state oscillation frequency is adopted for calculation, the accuracy of indoor temperature control is improved, and temperature fluctuation is reduced. And when the temperature is close to the target temperature, through a strategy of adjusting the frequency of the compressor to be the steady-state frequency fstep, rapid temperature fluctuation is avoided, and rapid and stable temperature response is realized.

The present invention discloses a device and method for pre-oxidizing carbon fiber by concentrating sunlight. The device mainly includes a wire-releasing device, a quartz tube, a catalyst micro-injection pump, a hot air device, a sunlight concentrating device and a wire-collecting device. The wire-releasing device is located at the front end of the system, the quartz tube is installed on the right side of the wire-releasing device, the catalyst micro-injection pump and the hot air device are respectively located on the upper and lower sides of the quartz tube, the right side of the catalyst micro-injection pump and the hot air device and the two sides of the quartz tube are respectively installed with sunlight concentrating devices, and the rightmost end of the quartz tube is installed with a wire-collecting device. In the method of the present invention, concentrated sunlight or a xenon lamp is used to directly heat the carbon fiber, the temperature response is fast, and a large number of heating and heat preservation devices are omitted; a catalyst solution is injected by a micro-injection pump, the concentration and dosage of the catalyst can be quantitatively controlled, the pre-oxidation rate is accelerated, the skin-core structure is reduced, and the temperature of the carbon fiber surface is controllable by adjusting the distance from the Fresnel lens to the carbon fiber surface.

The invention relates to the technical field of medical equipment, and provides an intraoperative automatic flushing water device and an intraoperative flushing water temperature control method. The first sterile liquid bag is arranged in the heating box, and the second sterile liquid bag is arranged in the normal temperature box; the heating module is used for heating the first sterile liquid bag in the heating box; the first water suction pump and the second water suction pump are used for sucking sterile liquid in the first sterile liquid bag and the second sterile liquid bag through pipelines respectively; the mixing pipeline assembly is connected with the first water suction pump and the second water suction pump and is used for mixing the heated sterile liquid and the normal-temperature sterile liquid which are sucked by the water suction pumps; the disposable flushing pipeline is detachably connected with the water outlet connector of the mixing pipeline assembly, mixed sterile liquid in the mixing pipeline assembly is conveyed to the water gun, and intraoperative flushing is conducted through the water gun. The double-pump proportional mixing temperature control principle is adopted, the thermal inertia limitation of a traditional direct heating mode is broken through, and accurate, rapid and dynamic adjustment of the temperature and the flow speed of flushing fluid is achieved.

This invention belongs to the field of fuel cell thermal management technology, and particularly relates to a battery cooling system and its control method based on a microtube bundle heat exchanger and countercurrent collision jet atomization. The system includes: a fuel cell stack, a microtube bundle heat exchanger connected to the fuel cell stack via a coolant circulation loop, a cathode drainage recovery unit, and a countercurrent collision jet atomization unit comprising a fan and an atomizing spray module. The fan, atomizing spray module, and microtube bundle heat exchanger are arranged sequentially. The airflow direction generated by the fan rotation and the direction of the water mist sprayed by the atomizing spray module are opposite to each other, so that the water mist sprayed by the atomizing spray module initially moves towards the direction of the fan. After its speed decreases to zero, it is driven by the airflow generated by the fan to move in the opposite direction and flows through the gaps within the microtube bundle heat exchanger, serving as shell-side fluid to cool the tube-side fluid within the microtube bundle heat exchanger.

The invention discloses an optical fiber temperature measuring device capable of realizing high-density measurement of dynamic total temperature of inlet and outlet airflow of an aero-engine. The optical fiber temperature measuring device comprises a V-shaped groove (1), a thin film Fabry-Perot (2), a bracket (4), a tail handle (5) and a transmission optical fiber (6), the thin film Fabry-Perot (2) is placed in the V-shaped groove (1) and is located at the end part of the transmission optical fiber (6); the end face of the thin film Fabry-Perot (2) is over against the detected airflow; the bracket (4) is used for clamping the V-shaped groove (1); the tail handle (5) is connected with the bracket (4); the tail handle (5) and the bracket (4) are used for placing a transmission optical fiber (6), so that the transmission optical fiber (6) is clamped into the V-shaped groove (1); and the transmission optical fiber (6) is of an optical fiber array structure. According to the invention, an optical fiber array structure is adopted, and a plurality of end-coated optical fibers are arranged together to form an intensive temperature field measurement total temperature probe, so that the temperature field temperature measurement spatial resolution of an aero-engine can be greatly improved.

The invention discloses plasma external deposition equipment and a plasma external deposition method for manufacturing an optical fiber preform. The equipment comprises a plasma source; the electromagnetic coil is used for generating an induction high-frequency electromagnetic field; the blowtorch is nested in the electromagnetic coil, the blowtorch comprises five layers of structures, and each layer of structure is connected with a gas channel for introducing different raw materials; the lathe is used for fixing the optical fiber preform and controlling rotation of the optical fiber preform and movement of the blowtorch; and the holding furnaces are arranged at two ends of the optical fiber preform. According to the invention, an out-of-tube deposition method is adopted, and gas flow rates of five gas channels are designed and adjusted, so that ionized gas is ionized in a high-frequency electromagnetic field at the minimum flow rate, plasma flame and a high-temperature area are generated, and a silicon raw material and oxygen rapidly pass through the plasma flame and then are rapidly sprayed to the surface of the optical fiber preform; the fluorine raw material is introduced through the edge position of the plasma flame with the lowest relative temperature, volatilization of the fluorine raw material is reduced, the utilization rate of the fluorine raw material can be increased to 60%, and the utilization rate of the silicon raw material can be increased to 70%.

The invention discloses a test bed for thrust measurement of a small engine, and relates to the technical field of thrust measurement. The invention provides a test bench for measuring thrust of a small engine, and aims to solve the technical problems that most of existing test benches for measuring thrust of small engines in the prior art pay attention to single performance parameters, the capacity of multi-sensor integration is lacked, the measurement workload and cost are increased, and the measurement efficiency is reduced. Comprising a test bench body, an engine mounting rack, a thrust measuring system, a vibration measuring system, an environment pressure measuring system and a consumption measuring system, and the engine mounting rack is arranged on the test bench body and used for mounting a to-be-tested engine; the thrust measuring system is used for measuring the thrust of the engine to be tested; the vibration measurement system is used for measuring vibration generated in the operation process of the engine to be tested; the consumption measuring system is used for measuring the energy consumption of the engine to be tested. The method is suitable for thrust measurement of small engines.