8results about How to "Guaranteed temperature gradient" patented technology

The invention discloses a separation process of EPA-EE and DHA-EE, and relates to the technical field of separation and purification of polyunsaturated fatty acid ethyl ester. The invention discloses a separation process of EPA-EE and DHA-EE, which comprises the following steps: firstly, carrying out reflux reaction on deep sea crude fish oil by using absolute ethyl alcohol and strong base anion exchange resin, carrying out centrifugal separation, and collecting an oil phase; adding the oil phase into molecular distillation to obtain a raw material solution; performing chromatographic separation on the raw material solution to obtain an EPA-EE raffinate and a DHA-EE extract; and carrying out reduced pressure distillation on the EPA-EE raffinate and the DHA-EE extract, and concentrating to obtain dried EPA-EE and DHA-EE products. The EPA-EE and DHA-EE obtained by the separation process disclosed by the invention are detected by a nuclear magnetic resonance spectrometer and a gas chromatograph, and the purity of the products reaches 99%.

The application provides a combined bottom plate structure of a laser, which is a multi-layer plate integrated structure fixedly connected to the bottom of the inner cavity of the laser, comprising a support plate, a semiconductor refrigerator, a heat insulation pad, a base plate and a mounting plate; the bottom surface of the support plate is fixedly connected to the bottom of the inner cavity of the laser shell; the semiconductor refrigerator and the heat insulation pad form a first square body structure, the bottom surface of the first square body structure is connected to the top surface of the support plate; the mounting plate and the base plate form a second square body structure; the bottom surface of the second square body structure is connected to the top surface of the first square body structure, and the top surface of the second square body structure is an optical platform for bearing a plurality of optical components and absorbing heat. The application also provides a heat dissipation method for the combined bottom plate structure of the laser. The application solves the technical problem that the bottom plate structure of the existing laser cannot simultaneously meet the requirements of high-efficiency heat dissipation, accurate temperature control and stable structure due to the single material.

This invention relates to the field of chip heat sink technology, specifically to a heat sink for chips, comprising a base, the base including a heat-conducting plate for contacting the chip; a vapor chamber on the heat-conducting plate, with multiple heat pipes evenly connected around the circumference of the vapor chamber, multiple annular heat dissipation fins fixedly inserted on the heat pipes, the multiple heat dissipation fins being distributed vertically, each heat dissipation fin having a central hole, a cooling pipe rotatably disposed within the central hole of the multiple heat dissipation fins, a fan disposed on the inner side of the top of the cooling pipe, and multiple liquid cooling plates disposed on the outer circumference of the cooling pipe, the liquid cooling plates rotating synchronously with the cooling pipe, each liquid cooling plate being located between two adjacent heat dissipation fins, the cooling pipe having multiple air outlets evenly distributed along the circumference of the cooling pipe and evenly distributed vertically along the cooling pipe, the diameter of the air outlets gradually decreasing from top to bottom, extending the overall service life of the heat dissipation fins.

The present invention relates to a method for drawing a six-inch zone melting silicon single crystal and a heat shield used therein. A heat shield is arranged 40 mm below a heating coil in a middle furnace chamber of a zone melting single crystal furnace, the upper diameter of the heat shield cover is 90 mm, the lower diameter is 215 mm, the height is 40 mm, and the pressure of cooling water in the condensation pipeline is 3.2 bar; when performing shoulder expansion, shoulder rotation, equal diameter, and finishing processes, the silicon single crystal moves downward along the lower axis and enters the heat shield area, and the heat reflected by the heat shield cover acts on the lower part of the single crystal, avoiding the single crystal from bursting or remelting due to excessive or insufficient temperature gradient, resulting in crystallization failure.

The invention belongs to the field of casting of single-crystal castings, and particularly relates to a directional solidification method for local cooling of liquid metal of a single-crystal casting. According to the method, a liquid metal cooling module capable of moving along with a casting set is designed, a water cooling ring is used for cooling liquid metal, the lower end of the casting set is combined through seed crystals, a fully-coated shell is prepared, and a shell system and the liquid metal cooling module synchronously descend to be away from a heating area, so that the directional solidification casting is obtained. By means of the method, pollution possibly occurring in the liquid metal cooling process is isolated, it is guaranteed that the shell is not infected by reducing contact, and the percent of pass of the liquid metal cooling method is effectively increased.

The invention discloses an Mg3Sb2-based semiconductor material for energy conversion and a preparation method thereof, and belongs to the technical field of energy conversion, and the molecular formula of the Mg3Sb2-based semiconductor material is Mg < 3.2 > Bi < 1.3 > Sb < 0.7 >. Mg < 3.2 > Bi < 1.3 > Sb < 0.7 > can generate n-p conduction transformation; when the K is less than 500 K, Mg < 3.2 > Bi < 1.3 > Sb < 0.7 > is an n-type semiconductor; when the voltage is greater than 500 K, Mg < 3.2 > Bi < 1.3 > Sb < 0.7 > is a p-type semiconductor. The preparation method comprises the following steps: uniformly mixing magnesium powder, bismuth powder and antimony powder according to a molar ratio of 3.2: 1.3: 0.7, sealing in a pure argon environment, and carrying out alloying, cold pressing and sintering to obtain the Mg3.2 Bi1. 3Sb0.7. When Bi is doped into the Sb position, the Mg vacancy concentration in the material can be effectively reduced, and the electron concentration can be improved at the same time. The doping not only enables the energy band gap of the material to be narrowed and converted into a narrow-band-gap semiconductor, but also improves the carrier concentration of the material. Under the combined action of the two factors, the electron concentration in the material is remarkably enhanced, and then conversion from an n-type conduction type to a p-type conduction type can be achieved. Therefore, the material has huge application potential in the technical field of energy conversion.

The invention provides a temperature measuring device, and relates to the technical field of aluminum bar temperature measuring devices, the temperature measuring device comprises a fixed side temperature measuring assembly, a movable side temperature measuring assembly and a surface temperature measuring assembly, the fixed side temperature measuring assembly is installed behind a hollow motor permanent magnet of permanent magnet induction heating equipment, and the movable side temperature measuring assembly is installed on the surface of the permanent magnet induction heating equipment. The moving side temperature measuring assembly is arranged behind a moving side gripper of the permanent magnet induction heating equipment, and the surface temperature measuring assembly is arranged on the end face of a permanent magnet of the hollow motor. Through the design of the fixed side temperature measuring assembly, the movable side temperature measuring assembly and the surface temperature measuring assembly, automatic and flexible collection of the surface temperature of the aluminum bar core is achieved, meanwhile, the collection position is accurate and controllable, the detection precision of the aluminum bar gradient heating temperature of an aluminum bar can be greatly improved, the metal plasticity of a final aluminum bar extrusion part is improved, and the deformation resistance is reduced.

The application discloses a new energy battery coating post-drying multivariable model predictive control system APC The control system performs real-time optimization control and rolling update according to the calling period. Specifically, the control system performs prediction and optimization calculation based on a model according to the set values of the return air valve opening, the exhaust fan frequency and the external circulating fan frequency of the last calling period, the NMP concentration measurement value at the current time, the oven pressure measurement value, the target value of the NMP concentration and the measurable external disturbance change data, and outputs the optimal sequence of the set values of the return air valve opening, the exhaust fan frequency and the external circulating fan frequency of the next period. Finally, the output values of the first time of all input variables in the optimal sequence are written back to the related actuators of the drying system, and the closed-loop control is completed. The application realizes real-time online optimization of the post-coating drying process based on the predicted dynamic optimization control under the premise of guaranteeing the stability of the system and the non-exceeding of the toxic solvent NMP concentration, and realizes energy consumption reduction while guaranteeing the collaborative and stable operation of the multiple ovens.