9results about How to "Reduce power density" patented technology

The invention discloses a slice laser based on a topological structure dodging layer. The slice laser comprises a pumping system, a pumping light injection module and a composite dodging waveguide structure, pumping light generated by the pumping system enters the composite dodging waveguide structure through the pumping light injection module; the front end face of the composite dodging waveguide structure is plated with a pumping light wavelength high-reflective film and a laser wavelength antireflection film, and the rear end face of the composite dodging waveguide structure is plated with a pumping source wavelength and laser wavelength high-reflective film; the composite dodging waveguide structure comprises a slice gain medium, a topological structure dodging layer and a middle refractive index layer which are sequentially arranged from the front end face to the rear end face. The topological structure dodging layer is composed of a low-refractive-index material layer and a high-refractive-index material topological graph arranged on the low-refractive-index material layer; and the pump light injection module is fixed above the high refractive index material of the middle refractive index layer or the topological structure dodging layer. Pumping uniformity is improved fundamentally, high-order mode suppression and efficient fundamental mode extraction are facilitated, and output power and light beam quality are improved at the same time.

The invention discloses an all-fiber high-power narrow-linewidth laser long-distance transmission system and method. The system comprises a narrow-linewidth laser, a pumping source, a pumping beam combiner, a gain fiber, a cladding light stripper, a coupling device, a double-core fiber and an output device. The laser outputs initial laser, the initial laser and pumping source light are injected into the gain optical fiber through the beam combiner to form high-power laser, the stripper removes residual pumping light, the coupling device guides the laser into the double-core optical fiber, the laser is periodically coupled between fiber cores to disperse power density and suppress stimulated Brillouin scattering, and finally the laser is shaped and output through the output device. System devices are connected through an optical fiber fusion splicer, a passive double-core optical fiber is replaced by an active double-core optical fiber and can be applied to an optical fiber amplifier, and long-distance stable transmission is achieved.

The utility model discloses an instant heating type heating body assembly for drinking water equipment, which comprises a heating pipe, a water inlet end cover, a water outlet end cover and a heating electrode, the heating pipe is of a cylindrical structure, and the water inlet end cover and the water outlet end cover are respectively arranged at an inlet end and an outlet end of the heating pipe in a sealing fit mode. One end of the heating electrode is sleeved on the heating pipe, and the other end of the heating electrode is connected with an external power supply; a plurality of protruding parts are arranged on the inner wall of the heating pipe in the flowing direction, and every two adjacent protruding parts in the flowing direction are arranged in a staggered mode. According to the utility model, the lug bosses are arranged on the inner wall of the heating pipe, so that the direct effective contact area between the heating pipe and water is effectively increased, and the heating efficiency is improved; meanwhile, violent turbulent flow can be formed through the action of the protruding parts which are arranged in a staggered mode and water flow, so that generation of bubbles is effectively reduced, and the service life of the heating pipe is prolonged.

The invention discloses a high-voltage asynchronous three-phase motor for a coal mining machine, and relates to the technical field of coal mining motors, the high-voltage asynchronous three-phase motor comprises a machine base, a front end cover and a rear end cover, a winding stator iron core is arranged in the machine base, the end part of the winding stator iron core is fixedly connected with the machine base, and a rotor is rotatably connected in the machine base through a rotating shaft; the bearing assembly comprises bearing chambers formed in the front end cover and the rear end cover, the two ends of the rotating shaft are rotationally connected with the bearing chambers through bearings, the bearing chambers are provided with isolator assemblies, the isolator assemblies comprise static rings fixedly connected with the bearing chambers, the rotating shaft is provided with driving rings, and oil seals are arranged between the static rings and the driving rings; the sealing effect is improved; the cooling assembly comprises a plurality of cooling water channels formed in the two sides of the machine base, the front end cover and the rear end cover are each provided with a circulating water channel and a bearing chamber water channel, and the circulating water channels communicate with the corresponding cooling water channels; the cooling and sealing effects can be effectively improved.

This application relates to the field of optical device technology, and discloses a Faraday rotator, its fabrication method, and an isolator. The Faraday rotator comprises multiple magneto-optical crystals and multiple heat-dissipating crystals, which are alternately stacked along the optical path. Embodiments of this application can overcome the thermal focus shift defect of the isolator without increasing the output beam diameter of the collimator.

The utility model provides a clothes processing device, and relates to the technical field of clothes cleaning. The clothes processing device can comprise the inner cylinder, the outer cylinder, the heating device and the electrolyzing device, the avoiding groove is formed in the outer cylinder, the heating device and the electrolyzing device are located on the front side and the rear side of the avoiding groove respectively, the electrolyzing device and the heating device are separated from each other, and therefore the size of an electrode of the electrolyzing device cannot be limited by the heating device, and the service life of the electrolyzing device is prolonged. The size of the electrode of the electrolysis device can be enlarged, so that the area of the electrolysis device is increased, the power density is reduced, and the problem of short service life or poor performance can be solved. And the possibility of contact between the electrolysis device and the heating device caused by installation errors or screw looseness is reduced, so that the risk of short circuit of the motor is reduced. Calcium and magnesium ions which are accumulated on the surface of the cathode of the electrolysis device and form precipitates due to long-time electrolysis are reduced, and reduction of electrode performance is slowed down.

This application discloses an electric drive device and a vehicle. The electric drive device includes a housing, and a motor assembly, a transmission assembly, and an output assembly housed within the housing's internal space. The transmission assembly includes a planetary gear assembly and a drive shaft. The output shaft of the motor assembly, the planetary gear assembly, and the drive shaft are sequentially meshed on a first rotation axis. The output assembly is disposed along a second rotation axis and meshes with the drive shaft. The first and second rotation axes are parallel but not coincident. Thus, the drive shaft and the planetary gear assembly are connected in the direction of the first rotation axis and rotate on the first rotation axis via the output shaft. The output assembly meshes with the outer circumference of the drive shaft, causing the output assembly to rotate about a second rotation axis parallel to the first rotation axis. This reduces the torque of the output shaft, increases the transmission ratio of the electric drive device, and reduces the space occupied by the electric drive device, thereby enabling the electric drive device to achieve lower power density and smaller size.

The application discloses an LLC resonant converter, a power supply circuit and a method for generating an output voltage. The LLC resonant converter comprises a full-bridge switching circuit, a transformer, a resonant circuit and a bridge rectifier. The full-bridge switching circuit comprises a first transistor, a second transistor, a third transistor and a fourth transistor, the first ends of the first transistor and the third transistor are connected to a direct current input voltage, and the second ends of the first transistor and the third transistor are respectively connected to the first ends of the second transistor and the fourth transistor. The two ends of a secondary winding of the transformer are respectively connected to the second ends of the fourth transistor and the second transistor. The resonant circuit is connected between a first switching node formed by the first transistor and the second transistor and a second switching node formed by the third transistor and the fourth transistor. The bridge rectifier is connected between the two ends of the secondary winding to generate a rectified output signal, and the rectified output signal is filtered to generate an output voltage. The application improves the efficiency of the LLC resonant converter.

The application discloses a preparation method of an n-type gallium nitride-based GAA-HEMT inverter, and comprises the following steps: S1, growing aluminum oxide on a GaN single crystal substrate, etching the middle part of the barrier layer and depositing a metal gate; S2, etching the middle part of the gate to form a groove, depositing aluminum oxide, etching the middle and both sides of the aluminum oxide, growing GaN nanosheets in the etching area, doping Si after growing AlGaN nanosheets, growing GaN nanosheets to form p-GaN nanosheets by doping Mg; S3, etching the p-GaN nanosheets to make the width of the p-GaN nanosheets same as that of the gate, evaporating a metal film in the thickness direction of the two layers of nanosheets to prepare a source electrode and a drain electrode, growing aluminum oxide on the surface of the device to cover the p-GaN nanosheets and the AlGaN nanosheets, depositing a metal gate to cover the aluminum oxide to form an E-mode GaN; and S4, growing aluminum oxide, etching the middle part of the aluminum oxide to deposit a metal gate, and preparing GaN nanosheets, AlGaN nanosheets, a source electrode and a drain electrode in the manner of S2 and S3, growing aluminum oxide to cover the AlGaN nanosheets, depositing a metal gate to cover the aluminum oxide to obtain a D-mode GaN with a GAA structure.