466 results about "Channel inlet" patented technology

The invention relates to a method for optimizing a liquid metal micro-channel radiator. The method comprises the following steps: determining basic parameters for optimizing the radiator; determining boundary conditions of a micro-channel inlet, and establishing a two-dimensional liquid metal micro-channel radiator model; establishing a topological optimization objective function and constraint conditions according to thermal control index requirements; carrying out material interpolation function definition on the reverse permeability coefficient of the porous medium, the heat conduction coefficient of the material and the specific heat coefficient of the material; carrying out iterative calculation on the two-dimensional liquid metal micro-channel radiator model to obtain an optimized radiator channel configuration; constructing a three-dimensional model of the liquid metal radiator flow channel; comparing an analysis result of the three-dimensional finite element model of the radiator with a heat dissipation index and a flow index, and judging whether a working requirement is met or not; and when the working requirements are met, the liquid metal micro-channel radiator with the most effective corresponding heat dissipation capability is obtained. According to the invention, the power consumption of an external driving system can be reduced, and the corresponding optimal liquid metal micro-channel radiator structure can be obtained.

The invention provides a micro-channel liquid cooling radiator which comprises a liquid cooling plate body, a cavity for a liquid working medium to flow is formed in the liquid cooling plate body, the cavity comprises a first micro-channel area and a second micro-channel area which are separated from each other, a communicating cavity is further formed in the cavity, and the first micro-channel area is communicated with the second micro-channel area. The communicating cavity is communicated with a micro-channel outlet of the first micro-channel area and a micro-channel inlet of the second micro-channel area, so that a liquid working medium flowing out of the first micro-channel area enters the second micro-channel area through the communicating cavity. In the micro-channel liquid cooling radiator, the first micro-channel area and the second micro-channel area can be designed according to heat source distribution characteristics, the first micro-channel area is used for cooling a main heat source or a heat source high heating area preferentially, and the second micro-channel area is used for cooling a secondary heat source or a heat source low heating area. Therefore, the maximum temperature and temperature uniformity of the main heat source, the secondary heat source, the source high-heating area and the heat source low-heating area are effectively controlled, and chip computing power maximization is achieved.

The invention relates to a method for assisting a cutter suction dredger to pass through a narrow channel by a grab dredger. Comprising the following steps that S1, the stern of the cutter suction dredger is adjusted to face a channel, when the vertical distance between the center of three cable columns of the stern and an inlet of the channel is d1, the cutter suction dredger stops moving, a lower steel pile keeps the position of the dredger, two transverse moving anchors of the bow are thrown, two transverse moving cables are tightened, and anchor braking is completed; s2, the grab dredger slowly gets close to a channel outlet under the assistance of the auxiliary ship, the direction of the grab dredger is adjusted, the body of the grab dredger is transversely arranged at the channel outlet, and when the distance between the stern of the cutter suction dredger and the side of the grab dredger is L1, the lower steel pile of the grab dredger is positioned; s3, the cutter suction dredger lifts the steel pile, a near-side anchor cable winch of the grab dredger takes up a cable, the cutter suction dredger transversely moves a winch to synchronously pay off the cable, the cutter suction dredger slowly moves into the channel, and when the distance between the stern of the cutter suction dredger and the ship side of the grab dredger is L2, the grab dredger stops taking up the cable, the cutter suction dredger stops paying off the cable, and the cutter suction dredger descends the steel pile to be positioned; s4, the grab dredger lifts the steel pile, a far-side anchor cable winch of the grab dredger takes up a cable, a near-side anchor cable is synchronously paid off, the grab dredger slowly gets away from the cutter suction dredger, when the distance between the stern of the cutter suction dredger and the ship side of the grab dredger is L1, the grab dredger stops moving, and the grab dredger is positioned under the steel pile; and S5, repeating the steps S3 and S4. According to the method for assisting the cutter suction dredger in passing through the narrow channel through the grab dredger, the feasibility and safety of operation when the suction dredger passes through the narrow channel are improved.

The invention discloses a full-automatic multi-component dispensing dynamic mixing proportion closed-loop control system, which relates to the technical field of semiconductor manufacturing, and comprises a multi-component feeding module, a dynamic proportioning execution module, an online detection module, an intelligent control module, a mixing reaction module, an anti-pollution module and a data management module, the device has the advantages that anti-sticking conveying and rapid switching of multi-form raw materials are achieved through a plurality of independent flow channels and inner wall diamond-like coatings of the multi-component feeding module in cooperation with a flow channel inlet vibrating screen and an outlet electromagnetic valve, a double-metering-pump parallel structure and a double-axial-flow type pulse damper are adopted in the dynamic matching execution module, and the dynamic matching efficiency is improved. And by combining a nonlinear model prediction controller of the intelligent control module and BP neural network adaptive compensation, the dynamic adjustment precision of the multi-component mixing ratio is remarkably improved, the mixing uniformity and purity reach the standard, the product scrapping caused by the ratio error is greatly reduced, and the photoresist production yield and stability are improved.

The utility model discloses a liquid cooling plate, and relates to the technical field of liquid cooling, the liquid cooling plate comprises a plate-shaped body, a cooling flow channel structure is arranged in the plate-shaped body, and the cooling flow channel structure comprises a flow channel inlet, a flow channel outlet and at least one cooling flow channel communicated between the flow channel inlet and the flow channel outlet; the cooling flow channel comprises a heat exchange flow dividing section with at least one stage of flow dividing branch channel, a heat exchange concentration section with a plurality of heat exchange flow channels and a heat exchange flow gathering section with at least one stage of flow gathering branch channel, and the heat exchange flow dividing section, the heat exchange concentration section and the heat exchange flow gathering section are sequentially arranged in a communicating mode in the flowing direction of a cooling medium in the cooling flow channel. The at least one stage of shunting branch channel can uniformly distribute a cooling medium flowing into the cooling flow channel into the plurality of heat exchange flow channels, and the at least one stage of converging branch channel can converge the cooling medium in the plurality of heat exchange flow channels to flow out of the cooling flow channel. Thus, on the basis that the heat dissipation requirements of the front-end low-heat area and the rear-end low-heat area are met, efficient heat exchange of the high-heat area is achieved, and the heat dissipation effect, energy conservation and consumption reduction are both considered.

In some examples, a heat exchanger includes a first flow channel having a first flow channel inlet and a first flow channel outlet. The heat exchanger also includes a second flow channel having a second flow channel inlet and a second flow channel outlet. A fin may separate the first flow channel from the second flow channel. The fin may define at least one aperture configured to allow fluid to flow between the first flow channel and the second flow channel if one of the first flow channel inlet or second flow channel inlet becomes constricted through a buildup of foreign object debris.

The invention discloses a microchannel condenser flow distribution global simulation method and system, and relates to the field of microchannel condenser flow distribution calculation. The method comprises the following steps: firstly, constructing a heat transfer and resistance model and forming a single-channel model by combining the size and structure of a parallel channel of the condenser and working medium flow heat exchange characteristics, and constructing a shunting and converging numerical model according to an inlet and outlet area structure of the condenser; secondly, numerical simulation is conducted on the division and convergence numerical model, and stable initial field distribution is obtained; then, determining the mass flow rate of each channel based on the shunting initial field, calculating the back pressure of the channel by taking the mass flow rate as the inlet boundary condition of a confluence model, calculating the inlet pressure of the channel through a single-channel model, and updating the outlet boundary of the shunting model; and finally, iterating the process until the channel mass flow error is smaller than a limit value, obtaining the distribution of the sub-confluence three-dimensional physical field and the one-dimensional flow heat exchange parameters and the heat exchange amount of the parallel channels, and checking whether the heat exchange amount meets the design requirements or not. The method gives consideration to calculation efficiency and precision, can provide support for structure optimization of the micro-channel condenser, and is suitable for micro-channel condenser design in the fields of refrigeration equipment, air conditioning systems and the like.

The invention relates to the technical field of reactor safety, and provides a device for simulating local concentration of heat flow in a rectangular narrow-slit channel, which comprises a core body, an insulating layer and a pressure-bearing shell are sequentially attached and wrapped outside the core body, the rectangular narrow-slit channel is arranged in the core body, two ends of the core body are respectively connected with a flow channel inlet and a flow channel outlet which are communicated with the rectangular narrow-slit channel, and the flow channel inlet and the flow channel outlet are communicated with the pressure-bearing shell. The flow channel inlet and the flow channel outlet are both connected with conductive copper bars used for being externally connected with a power source to enable the core body to emit heat, a groove used for forming local concentration of heat flow density is formed in the single-side wide outer plate face of the core body, and the local resistance of the core body is changed by controlling the size of the groove. The heat flow density of a specified proportion is controllably increased in a specific area of the surface of the rectangular narrow slit channel, a heat flow density local concentration area is formed, the heat flow local concentration condition of the prototype fuel element is simulated, the groove depth of the groove in the length direction is gradually reduced from the center to the two sides, and the heat flow density of the heating surface of the heat flow concentration area is uniform; and the prototype nuclear heat release characteristic can be simulated more accurately.

The invention provides a multi-feedback-channel fluid oscillator, and belongs to the technical field of fluid jetting devices. Comprising an oscillation cavity, an inlet, a nozzle and at least three feedback channels, the inlet is formed in one end of the oscillation cavity, the nozzle is formed in the other end of the oscillation cavity, the nozzle and the inlet are oppositely arranged along the central axis of the oscillation cavity, and the feedback channels are circumferentially distributed around the central axis of the oscillation cavity. And each feedback channel is provided with a feedback channel inlet and a feedback channel outlet. Through the configuration design of the multiple feedback channels, the fluid can form feedback control flow through the feedback channels, and the fluid entering the oscillation cavity through the inlet flows along the wall of the oscillation cavity in multiple directions and is switched through the coupling effect of the fluid coanda effect and multi-channel backflow feedback. And finally, multi-direction sweeping self-oscillation jet flow is formed at the nozzle, so that the space coverage range and the atomization efficiency of the jet flow are greatly improved.

The present invention provides a double-sided connector and a solid oxide stack, the double-sided connector comprising: a body having a first surface and a second surface; the plurality of first grooves are formed in the first surface, and the plurality of first grooves are arranged at intervals along the first direction; the plurality of second grooves are formed in the second surface, and the plurality of second grooves are communicated with one another. The air channel inlet and the air channel outlet are located on the two sides of the second grooves in the first direction, and the gas channel inlet and the gas channel outlet are located on the two sides of the first groove in the second direction. Based on the arrangement of the plurality of first grooves and the plurality of second grooves, the stack height of the stack is reduced, the volume occupation of the stack is reduced, and the heat loss surface area of the stack is reduced, so that the space utilization rate, the volume power ratio and the energy utilization efficiency of the stack are improved. And based on the gas channel inlet and outlet and the air channel inlet and outlet which are optimally designed, the gas leakage risk is reduced, and the utilization rate of gas and air is increased.

The invention relates to the technical field of laser packaging heat dissipation, in particular to an efficient heat dissipation butterfly-shaped packaging tube shell which comprises at least one tube shell bottom plate and four tube shell side plates, and a cavity is defined by the four tube shell side plates and fixed to the tube shell bottom plate. And a heat dissipation channel inlet, a heat dissipation channel outlet and a liquid cooling heat dissipation channel which are communicated with one another are respectively formed in each tube shell bottom plate and at least one tube shell side plate. The heat dissipation channel inlet, the heat dissipation channel outlet and the liquid cooling heat dissipation channel are introduced into the side plate and bottom plate structure of the butterfly-shaped packaging tube shell, so that the first-stage or second-stage heat dissipation mode of the butterfly-shaped packaging device is changed into liquid cooling heat dissipation, the advantages of large space, flexible and compact structure, multiple pins and the like of the butterfly-shaped packaging device are reserved, and the heat dissipation efficiency of the butterfly-shaped packaging device is improved. The heat dissipation efficiency and the heat dissipation capacity are greatly improved, the heat dissipation path is shortened, the heat dissipation structure is simplified, the packaging difficulty is reduced, the heat dissipation level is reduced, the total power consumption of the system is reduced, the influence of the external environment temperature on the device is reduced, and the stability and the reliability of the device are improved.

The utility model discloses a bionic hexagonal bipolar plate which comprises a hexagonal plate body, the plate body is divided into four flow field areas by a longitudinal axis and a transverse axis of the plate body, the first flow field area, the second flow field area, the third flow field area and the fourth flow field area are respectively positioned on two sides of a central ridge; the outer edge of each flow field area comprises a side edge of the plate body connected with the central ridge and an area top edge positioned at the end part of the longitudinal axis; a plurality of inclined flow channels are arranged in each flow field area in parallel at intervals, and the inclined flow channels in each flow field area are sequentially communicated end to end; a flow field ridge is formed between every two adjacent inclined flow channels; the inclined flow channel located on the outermost side in the first flow field area is communicated with the flow channel inlet; and the inclined flow channel located on the outermost side in the fourth flow field area is communicated with the flow channel outlet. The utility model has the advantages that the drainage performance, the component distribution performance and the structural stability are greatly improved.

The invention provides an SOFC (Solid Oxide Fuel Cell) multi-channel snakelike flow field with gradient rib layout, and belongs to the technical field of fuel cells. The SOFC multi-channel snakelike flow field comprises gradient ribs, strip-shaped ribs and a snakelike flow channel, the gradient ribs are arranged on the two sides of a U-shaped structure of the snakelike flow channel, and the strip-shaped ribs are arranged at the bottom of the U-shaped structure of the snakelike flow channel. The multi-channel snakelike flow field is combined with the gradient rib structure, a multi-channel inlet reduces the number of flow channel bending times, reduces the gas accumulation risk, avoids the problems of insufficient gas supply and the like, and the gradient rib layout is beneficial to gas mixing diffusion, mass transfer enhancement, pressure drop reduction and net power density improvement.

The invention relates to the field of valves, and discloses a multi-channel fluid pressure stabilizing control valve which comprises a pressure stabilizing valve composed of an upper valve body and a lower valve body, the lower valve body is installed at the bottom of the upper valve body, the lower valve body is provided with an input pipe and a plurality of output pipes, a cavity is formed in the lower valve body, the output pipes are communicated with the cavity, and the multi-channel fluid pressure stabilizing control valve further comprises an energy storage groove formed in the top of the lower valve body; the damping holes are formed in the bottom wall of the energy storage groove, the number of the damping holes is the same as that of the output pipes, and the energy storage groove communicates with the cavity through the damping holes. According to the invention, through a mode of combining mechanical feedback and multi-stage energy storage compensation, high-precision pressure stabilization is realized, a diaphragm senses the pressure change of a cavity in real time, a linkage pressure regulating seat regulates the opening degree of a liquid inlet channel, a passive energy accumulator and an active pre-charging energy accumulator work cooperatively, the pressure is quickly absorbed or supplemented, the fluctuation range of the inlet pressure of other channels can be effectively controlled, and the stability of the system is improved. And the pressure of each channel is stabilized at a set value.

The invention discloses a high-performance fluid oscillator based on a turbulent flow column structure. The high-performance fluid oscillator comprises an oscillator body, and the oscillator body is provided with a fluid oscillator inlet, an oscillator inlet channel, a mixing chamber, a mixing chamber inlet, a mixing chamber outlet, a feedback channel, a feedback channel inlet, a feedback channel outlet, an oscillator outlet channel, a fluid oscillator outlet and turbulent flow columns; the fluid oscillator inlet is communicated with the oscillator inlet channel; the oscillator inlet channel is communicated with the feedback channel outlet and the mixing chamber inlet; the mixing chamber inlet is communicated with the mixing chamber; the mixing chamber is communicated with the mixing chamber outlet, the feedback channel inlet and the oscillator outlet channel; and a unique turbulent flow column structure is arranged at the rear end of the oscillator outlet channel. The device does not need extra power, utilizes the Coendall effect, the backflow feedback effect and the Karman vortex street effect of the airflow to generate periodic large-amplitude up-and-down swinging airflow at an outlet of the device, and is simple in structure, small in size, large in jet flow deflection angle, convenient to operate, reliable in running and free of maintenance.

The invention discloses a three-dimensional S-shaped bent inner concave runner design method and system. The design method comprises the following steps that a runner inlet molded line and a runner outlet molded line of a supersonic speed stamping runner are obtained; n discrete points are extracted in the circumferential directions of the inlet molded line and the outlet molded line to form N groups of inlet and outlet discrete point pairs; the change rule of S-shaped curve parameters is set in the circumferential direction of the runner inlet molded line / runner outlet molded line, and N S curves are obtained; acquiring a coordinate set of N * M discrete points on the curve set by M parallel interception planes; enveloping to generate an S-shaped curved surface, calculating the area of the two-dimensional cross section graph, and obtaining a flow channel sectional area change rule in the flow direction and a slope change rule of a center curve of the S-shaped curved surface; and judging whether the design is reasonable. The method can be suitable for computer-aided design of flow channels transited from various patterns including irregular patterns to circles or ellipses, and can meet the design of flow channels with offset inlet and outlet positions.

The utility model discloses a gas insulated switchgear (GIS) multichannel modularized inlet and outlet wire switch interval structure, which belongs to the technical field of high-voltage switches and comprises a bottom frame, a circuit breaker, a current transformer and a three-way special-shaped steering unit, the circuit breaker and the current transformer are horizontally connected, and one sides, far away from each other, of the circuit breaker and the current transformer are connected with a three-position isolation grounding switch. The upper part of the three-position isolation grounding switch is connected with the three-way special-shaped steering unit. The left and right sides of the three-way special-shaped steering unit are connected with the cable connection terminal unit. The upper portion of the three-way upward unit is connected with the three-way special-shaped steering unit, and the left side and the right side of the three-way special-shaped steering unit are connected with the cable connection terminal unit. Through the multi-channel incoming and outgoing line modular design, multi-channel free and flexible switching can be realized, multiple use conditions are ensured, the rated and redundant through-current capability of the high-voltage switch is flexibly and effectively exerted, and the multi-group low-current combined on-off condition is satisfied. The whole structure is simple and compact, the occupied space is small, and the installation and maintenance workload is small.

The invention relates to a honeycomb-like liquid cooling plate flow channel and a design method thereof, belongs to the technical field of electronic heat dissipation of aircrafts, and solves the problems of large occupied space and large flow resistance of heat source equipment in an existing aircraft heat dissipation system. A honeycomb-like liquid cooling plate flow channel is arranged in a rectangular liquid cooling plate and comprises a honeycomb flow channel net, a first collection flow channel, a second collection flow channel, a parallel linear flow channel, a flow channel inlet and a flow channel outlet, the flow channel inlet and the flow channel outlet are symmetrically formed in the centers of the left and right sides of the liquid cooling plate respectively, and the flow channel inlet is formed in the center of the right side of the liquid cooling plate and communicates with the first collection flow channel; the runner outlet is formed in the center of the left side plate of the liquid cooling plate and communicated with the second converging runner; the first collecting flow channel and the second collecting flow channel are square, the first collecting flow channel and the second collecting flow channel are connected with the N parallel linear flow channels respectively, and the parallel linear flow channels are connected with the honeycomb type flow channel net. The honeycomb-like liquid cooling plate runner is applied to heat source equipment, and is small in space and low in flow resistance.

Some embodiments of the technology disclosed herein relate to a system having a hydrodynamic separator element defining an element inlet and an element outlet. The element outlet has a first element outlet and a second element outlet. The hydrodynamic separator element has a plurality of curved microfluidic channels in fluid communication. Each of the plurality of microfluidic channels are arranged to operate in parallel. Each microfluidic channel defines a channel inlet downstream of the element inlet and a channel outlet having a first channel outlet upstream of the first element outlet and a second channel outlet upstream of the second element outlet. A flow characteristic sensor is in sensing communication with the separator element. A controller is in data communication with the flow characteristic sensor, where the controller is configured to provide a first alert upon the flow characteristic being outside a first threshold.

The invention discloses a seawater cooling system for a battery of a shell integrated high-speed underwater vehicle, and belongs to the technical field of unmanned underwater vehicles and new energy and energy conservation. Comprising a double-layer battery cabin section shell, a bow end plate and a stern end plate, wherein the bow end plate and the stern end plate are packaged at two ends of the double-layer battery cabin section shell; a battery module consisting of a plurality of single battery cells is mounted in the double-layer battery cabin section shell through a battery framework and a battery bracket; the battery bracket is used for positioning the battery framework and the battery module in the double-layer battery cabin section shell and is used as a soaking layer to accelerate heat transfer and ensure that the temperature of the battery module is balanced; a cooling medium flow channel is arranged in an interlayer of the double-layer battery cabin section shell, and a flow channel inlet and a flow channel outlet are formed in the outer-layer shell, so that a cooling medium can continuously flow through the flow channel. Cold energy of ocean low-temperature seawater is fully utilized, passive, efficient, integrated and autonomous control of battery thermal management is achieved, a guarantee is provided for long-time safe and stable operation of a high-speed underwater vehicle, and cruising ability and safety are enhanced.

The invention relates to a selector valve, comprising: a stator and a rotor relatively rotatable about a rotation axis, the stator and the rotor respectively having a first surface and a second surface opposite to each other and in motive seal; the first surface is provided with a first access hole, a second access hole, a first stator radial groove, a second stator radial groove and a plurality of pairs of component connecting holes, and the component connecting holes comprise a first component connecting hole and a second component connecting hole; the second surface is provided with a rotor internal flow channel inlet, a rotor internal flow channel outlet, a rotor annular groove and a first rotor radial groove; when the rotor rotates relative to the stator, the first stator radial groove and the second stator radial groove can be communicated with the rotor internal flow channel outlet and the first rotor radial groove respectively. According to the scheme, the problems that an existing chromatography system is complex in structure and operation can be solved, all runners in the selector valve can be flushed, and the situation that the accuracy of follow-up analysis is affected due to internal residues of the selector valve is avoided.

The invention discloses an intelligent anti-flooding device for a space channel entrance, and particularly relates to the field of underground garage flooding prevention. The intelligent anti-flooding device comprises a channel pavement and side walls on the two sides of the channel pavement, a first groove and a second groove are formed in the bottom of the channel pavement, and a grid plate is placed at the top of the first groove; a plurality of drainage holes are formed in the bottom of the first groove, and a cover plate is hinged to the top of the second groove. By arranging the water level sensor and the air inflation assembly, when the water level sensor senses that the water level is high, the air inflation assembly inflates the air bag so that the air bag can be expanded on the channel road surface, and water flow is blocked through the air bag so as to prevent the water flow from entering the underground garage; the anti-flooding device can be automatically inducted to be started, stopped, retracted and released according to water level changes under the condition that urban inland inundation flood flows backwards, so that the full-intelligent anti-flooding effect without manual operation is achieved, and the risk that the underground garage is rapidly submerged is reduced.

The invention provides a low-specific-speed centrifugal pump flow channel design method and a low-specific-speed centrifugal pump. The method comprises the following steps that flow channel inlet and outlet parameters are determined according to the rated flow, the rated lift and the rated rotating speed of the low-specific-speed centrifugal pump; the flow channel inlet and outlet parameters comprise impeller inlet and outlet diameters, flow channel inner and outer side fillets, flow channel wrap angles, flow channel inlet and outlet angles and flow channel inlet and outlet section parameters; two ends of a curve are determined through a runner inlet section and a runner outlet section, at least four transition sections are arranged between a runner inlet and a runner outlet, the runner inlet section, the transition sections and the runner outlet section are connected through an arc curve, and the runner trend and shape are determined. According to the invention, the bad flow state in the flow channel can be avoided as much as possible while the energy consumption is reduced. And the working efficiency and long-term safe and stable operation of the low-specific-speed centrifugal pump are ensured.

The invention discloses a liquid cooling plate which comprises a liquid cooling plate body, the interior of the liquid cooling plate body is provided with a cooling cavity, the interior of the cooling cavity is provided with a plurality of polygonal heat conduction columns which are connected with the cavity bottom wall of the cooling cavity and are arranged in a regular array, and the polygonal heat conduction columns have at least two shapes; gaps between the polygonal heat conduction columns and gaps between the polygonal heat conduction columns and the cavity side wall of the cooling cavity are communicated with one another and form liquid cooling flow channels allowing cooling liquid to flow, the liquid cooling flow channels comprise honeycomb flow channels and straight flow channels, and the width of the honeycomb flow channels is at least partially narrowed; and the liquid cooling plate body is also provided with a flow channel inlet and a flow channel outlet which can be communicated with the liquid cooling flow channel. The honeycomb structure and the straight flow channel of the liquid cooling flow channel are formed by combining the polygonal heat conduction columns in different shapes, and the width of the honeycomb flow channel is at least partially narrowed, so that the flowing path of cooling liquid can be effectively optimized, the flowing speed of a cooling medium is increased, and the cooling efficiency is improved.

The present application provides a power assembly in which flow splitting is performed via a direct flow channel and an electric vehicle. A housing of the power assembly comprises a motor containing cavity, a speed reducer containing cavity, a flow channel inlet, and a plurality of flow channel outlets. The motor containing cavity is used for containing a stator and a rotor of a motor. The speed reducer containing cavity is used for containing a gear and a bearing of a speed reducer. The flow channel inlet is used for transporting a cooling liquid to the plurality of flow channel outlets via a same transmission flow channel. Two flow channel outlets among the plurality of flow channel outlets are used for transporting a cooling liquid to the motor containing cavity and the speed reducer containing cavity, respectively. An outlet of an oil pump is used for transporting a cooling liquid to the flow channel inlet via a heat exchanger and a direct flow channel. A valve is used for adjusting the flow of the cooling liquid transported to the flow channel inlet by at least one of the heat exchanger and the direct flow channel. According to the present application, the working temperature of the cooling liquid can be adjusted to improve the working performance and service life of the power assembly.

The application discloses a step variable pressure type micro-channel heat dissipation structure and a high-power laser cut-off light screen, and the structure comprises a flow channel (3), a gradually widened micro-channel (4), a first step variable pressure structure (5) and a second step variable pressure structure (6). The first step variable pressure structure (5) and the second step variable pressure structure (6) comprise a plurality of step-by-step increased elliptical cylinder arrays, the number of the elliptical cylinders is step-by-step increased, the length of the short axis of the elliptical cylinder is step-by-step decreased, the fluid flow cross-sectional area is step-by-step decreased, and the flow speed is step-by-step increased to form a jet effect to accelerate the fluid, and finally the fluid enters the gradually widened micro-channel (4) at a higher flow speed to realize flow heat exchange. The step variable pressure structure with the step-by-step increased number of elliptical cylinders, the step-by-step decreased length of the short axis and the step-by-step decreased total flow cross-sectional area at the micro-channel inlet section can rapidly and gradiently increase the pressure to accelerate the fluid, and effectively solve the problems of excessive and concentrated pressure at the micro-channel inlet.

The invention discloses an axial magnetic flux motor cooling structure, which comprises a cooling structure channel and a sealing end cover which are arranged in a stator core, the cooling structure channel and the sealing end cover are matched to form a cooling cavity, and a winding coil is fixed in the cooling cavity. A channel flow guide structure and an end cover flow guide structure are arranged in the cooling cavity, the channel flow guide structure comprises a liquid spraying structure, a wing-shaped flow guide blade, a sub-cavity separation structure and an outlet flow guide structure, and the end cover flow guide structure comprises a gap flow guide baffle, a flow division pressing plate and an outlet backflow structure. Cooling liquid enters the sealed cooling cavity through the flow channel inlet, then forms directional high-speed flow in the cooling cavity, and is discharged from the flow channel outlet after realizing efficient heat exchange with the winding coil. Through immersion type cooling structure integration and diversion system path design, the cooling efficiency and the temperature uniformity of the winding coil are remarkably improved, and meanwhile, the compact structure design is beneficial to improving the motor power density and the system integration degree.

An impedance sensing structure is provided and includes a dielectric layer, a spiral electrode pair forming a dual spiral channel on the dielectric layer and having an inlet portion at a central region of the dual spiral channel and an outlet portion at an end of the dual spiral channel, inlet and outlet elements and sensing circuitry. The inlet and outlet elements are coupled with the inlet and outlet portions, respectively, for directing fluid or gas to flow through the dual spiral channel. The sensing circuitry is electrically connected with the spiral electrode pair and configured to sense the particles in the fluid or gas in accordance with an impedance of the spiral electrode pair and the fluid or gas flowing through the dual spiral channel.

The application provides a self-cooling air-breathing radio frequency plasma electric thruster, which comprises an air inlet channel, an ionization chamber and a nozzle, the air inlet channel is divided into a main air inlet channel and a secondary air inlet channel, the main air inlet channel is communicated with the ionization chamber, a cooling flow channel is arranged on the periphery of the ionization chamber, the secondary air inlet channel is communicated with a gas guide channel, the gas guide channel is communicated with the cooling flow channel through a cooling flow channel inlet, and the cooling flow channel is communicated with the ionization chamber through a cooling flow channel outlet; the gas taken by the main air inlet channel directly enters the ionization chamber to be ionized, the gas taken by the secondary air inlet channel is guided to the cooling flow channel inlet through the gas guide channel, enters the cooling flow channel through the cooling flow channel inlet, cools the ionization chamber, and then enters the ionization chamber through the cooling flow channel outlet to be ionized, and the two gas flows entering the ionization chamber are accelerated through the nozzle after being ionized, so that the thruster generates thrust. The cooling design provided by the application has the advantages of simple structure and high energy utilization rate.

Electronic power module, comprising a housing (2) with a carrier circuit board (4) which is arranged therein and on which a plurality of electronic power components (20) are arranged in a first group and a plurality of capacitors (21) are arranged in a second group and at least two connections (22) are provided adjacent to each other, and comprising a cooling plate (8) which, by way of a first side (9), is arranged in thermal contact with the carrier circuit board (4), wherein the cooling plate (8) has, on a second side (10) situated opposite the first side (9), channel projections (11) which bear against the housing (2) and via which a cooling channel (12) is defined between the cooling plate (8) and the housing (2), a coolant (26) supplied via a channel inlet (18) and discharged via a channel outlet (19) being guidable through the cooling channel, wherein the channel (12) has a first channel section (23) which extends adjacent to the first group comprising the power components (20) and which has a first channel cross-sectional area, this first channel section (23) having an adjoining meanderingly guided second channel section (24) which extends adjacent to the second group comprising the capacitors (21) and adjacent to the connections (22) and has a second channel cross-sectional area which is smaller than the first channel cross-sectional area.