212results about How to "Conducive to lightweight design" patented technology

The invention provides a space-spectrum joint sparse prior based satellitic hyperspectral compressed sensing reconstruction method. The method includes hyperspectral data-block diagonal random measurement of an onboard encoding end and compressed sensing construction of a ground decoding end. The onboard encoding-end adopts block-diagonal hyperspectral-data random measurement matrixes to perform independent random sampling on each spectral band so as to acquire measurement data and then sends the measurement data to the ground decoding end through a data link, the ground decoding end decomposes the data into low-rank components and sparse components, low-rand prior between the hyperspectral-data spectral bands and sparse prior in the spectral bands are jointed to establish a convex optimization reconstruction model, iteration solution is performed to obtain low-rank components and sparse components of reconstructed hyperspectral data, and the low-rank components and the sparse components are merged to obtain the reconstructed hyperspectral data. By the method, precision and efficiency of satellitic hyperspectral-image compressed sensing reconstruction are improved.

The invention provides a satellite hyper-spectral image compressed sensing reconstruction method based on image sparse regularization. The method comprises the following steps: Step 1, the three-dimensional cube of known hyper-spectral data is rearranged into a matrix; Step 2, a multi-vector measurement model is constructed with a stochastic convolution transform as a linear observation matrix, and each waveband is independently sampled to generate a measurement vector matrix; Step 3, a hyper-spectral image is decomposed in a sparse transform domain into a spectral association component and a difference component, and an image sparse regularization joint reconstruction model including the association component and the difference component is constructed; and Step 4, an alternating-direction multiplier iteration algorithm for solving the joint reconstruction model is put forward, the association component and the difference component of a transform domain are obtained, and then the association component and the difference component are merged to obtain reestablished hyper-spectral data. The method provided by the invention is high in degree of compression and high in precision during satellite hyper-spectral remote sensing data compression.

The invention discloses an underwater buoyancy adjusting device which comprises a sealing shell, a gasbag, a control module, an exhaust module and an inflation module. The gasbag is arranged outside the sealing shell, and the control module, the exhaust module and the inflation module are arranged inside the sealing shell. The inflation module is connected with the gasbag through an inflation pipesealing cabin penetrating piece, and an exhaust pipeline of the exhaust module communicates with an inflation pipeline of the inflation module. According to the underwater buoyancy adjusting device,a high-pressure pneumatic buoyancy system is adopted, a high-pressure gas source is adopted as buoyancy adjusting driving force, compared with a traditional buoyancy adjusting system, the weight is low, the maintaining cost is low, rapid replacement can be achieved, the weights of loads are reduced, and lightweight design of amphibious aircrafts is facilitated; and by arranging a safety valve, thesituation that under the condition that a controller breaks down or the large measuring error is generated by a gas pressure sensor inside the gasbag, superscalar excess gas is automatically releasedto the annular gasbag and thus gasbag blasting is caused is avoided.

The invention provides an automobile rear motor type connecting rod integrated rear axle suspension comprising an integrated rear axle shell body. A guide mechanism is arranged on the integrated rear axle shell body. The integrated rear axle shell body includes an axle shell, a cover body, and axle shaft sleeves arranged at the two ends of the axle shell and connected with wheels. The guide mechanism includes a longitudinal connecting rod mechanism arranged on the side walls of the two ends of the axle shell and a transverse connecting rod mechanism arranged on the upper end of the axle shell. The automobile rear motor type connecting rod integrated rear axle suspension further comprises shock absorbers which are longitudinally arranged at the two sides of the axle shell, and elastic elements which sleeve the shock absorbers respectively. The shock absorbers are disposed at the back of the guide mechanism. According to the invention, the longitudinal and transverse connecting rods of the guide mechanism bear the longitudinal force and transverse force in the running process of an automobile body, and the elastic elements and the shock absorbers jointly bear vertical load. Therefore, the dynamic unsprung mass is reduced, the dynamic sprung mass is increased, kinetic energy is released effectively, and the smoothness and comfort of a whole automobile are improved.

The invention relates to a rear structure of an inner plate for an SUV (sport utility vehicle) vehicle model. The rear structure comprises a C-column inner plate (1), an upper D-column inner plate (2), a lower D-column inner plate (3), a C-column reinforcing plate (4), an upper D-column reinforcing plate (6), a lower D-column reinforcing plate (7), a wheel casing inner plate assembly (9) and a wheel casing outer plate (10); the rear structure of the inner plate is characterized in that a connecting plate (5) is arranged between the C-column reinforcing plate (4) and the lower D-column reinforcing plate (7).

Disclosed is a train main and auxiliary integrated traction converter capable of being axially controlled independently. The train main and auxiliary integrated traction converter comprises two converter units which are independent completely, and an auxiliary inverter, wherein the auxiliary inverter is used for performing free switching in the intermediate link of the two converters through an auxiliary inverter switching apparatus; the back end of the auxiliary inverter is connected with an auxiliary transformer; after voltage drop is performed, the auxiliary inverter supplies electric energy to a charger and an auxiliary machine load; each converter unit comprises a four-quadrant rectifier which is used for performing alternating current-direct current conversion on the bow net single-phase alternating current, a main inverter which is used for converting the intermediate direct current into three-phase alternating current for a traction motor, a charging short-circuited circuit which is used for ensuring the charging and the normal operation of the converters, a grounding detecting unit which is used for monitoring the grounding conditions of each place of the main circuit of the traction converter, and a chopping unit which is used for carrying out overvoltage suppression and rapid discharging in the intermediate link. The train main and auxiliary integrated traction converter has the advantages of simple and compact structure, easy implementation, high reliability and the like.

The invention relates to a square tapered aluminum alloy automobile front carling based on an embedded carbon fiber. The square tapered aluminum alloy automobile front carling based on the embedded carbon fiber is characterized in that the section of the front carling is composed of two parts, namely the aluminum alloy outer wall and a carbon fiber reinforced plate. An aluminum alloy outer plate is little in elasticity modulus and good in deformation mode and the carbon fiber reinforced plate has the strong collision energy absorption capability. By means of the two new materials are combined and a square tapered structure, the contradiction among the high energy-absorption performance, the low-collision-acceleration peak value and the good crushing mode can be coordinated in a satisfying manner in the collision safety design process. The square tapered aluminum alloy automobile front carling based on the embedded carbon fiber has great significance in improvement of the collision performance and weight reduction.

The invention provides a multi-clutch module, a clutch oil supply system and an electric control hydraulic automatic transmission. The multi-clutch module comprises a shell structure, and an input shaft, a first planet row structure, a second planet row structure, a first clutch structure, a second clutch structure, a third clutch structure and a brake structure arranged in the shell structure; the first planet row structure and the second planet row structure are arranged at the two ends of the input shaft; the first clutch structure is connected to the second planet row structure and the input shaft; the second clutch structure is connected to the second planet row structure and the input shaft; the third clutch structure is connected to the first planet row structure and the input shaft; the brake structure is connected to the second planet row structure and the shell structure; the first clutch structure is positioned on the radial outer side of the input shaft; the second clutch structure and the third clutch structure are positioned on the outer side of the first clutch structure side by side; and the brake structure is positioned on the outer sides of the second clutch structure and the third clutch structure. The multi-clutch module is more compact in structure, reduces occupied space, simplifies the structure, and reduces the assembly requirements.

The invention discloses a multi-gear transmission and a center wheel pawl installation structure used in the same. A gear control assembly of the transmission comprises an operation device and a plurality of execution devices. The operation device comprises a sawtooth component arranged at the end of an output wheel hub rotationally, the sawtooth component drives a plurality of pawl rods, and the pawl rods are rotationally embedded in grooves formed in the axial direction of a main shaft; one ends of the pawl rods make contact with the sawtooth component, the pawl rods are controlled through the sawtooth component to rotate, a pawl of a corresponding center wheel connected with the other end of each pawl rod is operated to swing, and then the corresponding center wheels are controlled to be engaged and disengaged with the main shaft through the pawls. The pawl rods are subjected to gear shifting by rotating and shifting the pawls, and are small in abrasion and high in response speed. For the center wheels with a small size, the pawls are installed by arranging lengthening sleeves, the diameter of an inner gear ring can be reduced, the size of the inner transmission can be further effectively reduced, and light-weight design of the transmission is facilitated.

The invention discloses an external windshield. The external windshield comprises a rubber bag and two mounting bases which are arranged in parallel; each mounting base comprises a strip-shaped body and a first vertical part and a second vertical part which are perpendicular to the strip-shaped body and are arranged in parallel, wherein a groove is formed between the first vertical part and the second vertical part; the two side edges of the rubber bag are inserted into grooves of the two parallel mounting bases and fixed in the grooves. The external windshield has the advantages of being higher in structural strength, better in wear resistance, easy and convenient to mount and higher in maintainability.

The invention discloses a CVT (Continuously Variable Transmission)-based coaxial parallel hybrid power gas heat pump system, and relates to a novel air conditioning system for combining a CVT device and a hybrid power gas heat pump system into an organic whole body. The system comprises a CVT device, an engine, a motor, a lithium iron phosphate battery pack, a compressor, an evaporator, a condenser, a waste heat recovery system and the like. The power of the engine and the motor is coupled and then transferred to a drive shaft through a hydraulic torque converter of the CVT, a metal belt type continuously variable transmission mechanism and a main speed reducer to drive the compressor in the heat pump system to operate. The transmission ratio in the drive system is adjusted by controlling hydraulic pressure in driving and driven belt wheel cylinders so as to change working radius on driving and driven belt wheels, and continuously variable transmission can be realized in an equivalent wide range, so that the optimal matching of the transmission system and the working condition of the engine is obtained, and the gas economy of the entire heat pump system is improved.

The invention provides sponge foaming rubber for a car door sealing strip and a preparation method thereof, a car door sealing strip and a preparation method thereof. The sponge foaming rubber for the car door sealing strip, provided by the invention, is prepared from the following components in parts by weight: 20 to 40 parts of ethylene-propylene-diene monomer 9090M, 69 to 92 parts of ethylene-propylene-diene monomer V8800, 5 to 7 parts of active zinc oxide, 1 to 2 parts of stearic acid, 1 to 3 parts of a dispersant, 0.8 to 1.4 parts of erucamide, 1 to 2 parts of PEG-4000 (Polyethylene Glycol-4000), 5 to 10 parts of POE (Polyolefin Elastomer), 60 to 77 parts of paraffin oil R-2291, 30 to 50 parts of carbon black N550, 50 to 70 parts of carbon black SP5000, 1.5 to 2.5 parts of sulfur S-80, 6 to 10 parts of a moisture absorbent GR, 3 to 6.4 parts of an accelerant, 3 to 3.6 parts of a foaming agent OBSH-75 (Oxydibenzenesulfonyl Hydrazide-75) and 1.1 to 1.5 parts of a foaming agent AC3000-75. By adopting a formula of the sponge foaming rubber for the car door sealing strip, provided by the invention, the prepared sponge rubber has relatively low density and can meet a lightweight design; meanwhile, the obtained rubber also can have relatively good physical performance, so that the utilization quality of the car door sealing strip utilizing the sponge foaming rubber can also be improved.

The invention discloses a stable gamma' phase intensified Co-Ni-V-Al-base high temperature alloy. Co, Ni, V and Al are necessary elements, and chemical components of the stable gamma' phase intensified Co-Ni-V-Al-base high temperature alloy include, by atomic percent, 30%-40% of Ni, 1%-10% of V, 8%-14% of Al, 0%-6% of Ta, 0%-4% of Ti and the balance Co. The stable gamma' phase intensified Co-Ni-V-Al-base high temperature alloy is composed of a basal body gamma phase and a gamma'-Co3(V, Al) phase provided with an L12 crystal structure, and gamma separated phases are evenly distributed in the gamma basal body phase in a spherical shape or a cubic shape. Due to the fact that the alloy does not contain W elements or other high-ratio heavy elements, the density of the alloy is remarkably lowerthan that of a Co-Al-W-base alloy. In addition, when the alloy is preserved at the temperature of 900 DEG C for 4,000 hours, gamma / gamma' two phase tissue can still be acquired, and it shows that theintensifying phase in the alloy is the thermodynamic stable phase.

The invention belongs to the technical field of precision mechanical transmission, and particularly relates to a two-shaft two-frame photoelectric stabilization platform based on steel wire rope transmission. The platform comprises an azimuth assembly, a U-shaped frame assembly and a pitching assembly, wherein a steel wire rope is wound around a driving wheel and a driven wheel in an 8-shaped manner in the azimuth assembly and the pitching assembly, the driving wheel rotates to drive the steel wire rope to move, the steel wire rope pulls the driven wheel to rotate, and then the limited angularrotation of the azimuth and the pitching of the platform is realized. The two-shaft two-frame stabilization platform adopts a torque direct drive motor + steel wire rope transmission mode, and has the characteristics of high transmission precision and transmission rigidity, simple structure, convenient disassembly and assembly, low machining cost, and easy platform light quantization and miniaturization. The problem that the size and weight of the platform is large when a traditional two-shaft two-frame platform adopt moment direct drive, or the problem of low backlash transmission rigidity of the platform during gear reduction driving is solved.

The invention provides a rigid and flexible body hybrid modeling method for a locking mechanism, which comprises: separating a simplified geometric model of the locking mechanism according to a 3D model of the locking mechanism, and giving materials and attributes, wherein rigid attributes are given to at least one part and flexible attributes are given to the other part; determining a first rotary axis and a second rotary axis of a lock cylinder in an finite element network model and adjusting the position of the lock cylinder, so that the lock cylinder is in an unlocked state; establishing a kinematic connection unit and an elastic element of each part of the locking mechanism, giving attributes and spring rigidity and adjusting a pretensioning load value; and defining a test working condition, correcting and checking a locking behavior of the locking mechanism and obtaining a final rigid and flexible body hybrid model of the locking mechanism. By implementing the rigid and flexible body hybrid modeling method, the locking behavior of the locking mechanism can be precisely simulated; and the rigid and flexible body hybrid modeling method has high universality and is beneficial to lightweight design of an opening and closing part.

An electromagnetic control valve for a variable displacement compressor is mainly composed of valve parts, electromagnet parts and pressure sensing parts which are arranged on the same axis. The electromagnet parts are arranged between the valve parts and the pressure sensing parts, and each valve part comprises a valve body and a valve element arranged in the valve body, wherein the opening end of the lower end of the valve body is connected with a valve element support plate in an interference fit mode, the lower end of the valve element is contained in a middle through hole formed in the valve element support plate, and an inner cavity of the valve body is provided with multiple through holes which are used for communicating the exhaust pressure, the suction pressure and the crank pressure; the electromagnet parts can generate an electromagnetic force used for driving the adjacent valve element arranged over the electromagnet parts to move after being powered on; the pressure sensing parts can also generate a force used for driving the valve element to move due to the change of the suction pressure. The electromagnetic control valve for the variable displacement compressor has the advantages of being reasonable in structure, capable of improving the control precision and being used for the variable displacement compressor without a clutch, beneficial for the lightweight design of a car and the like.

The invention discloses an anti-concavity property analysis method and device based on a finite element method. The method includes the following steps: S1, obtaining a stress surface on the workpiece on which the anti-concavity property analysis will be conducted; S2, selecting a preset number of test points on the stress surface, and analyzing the maximum normal displacement produced by each test point under the action of a first normal load of a preset size; S3, selecting at least one test point with the largest normal displacement greater than the preset displacement as a loading point; S4, for each loading point, obtaining a stiffness curve of the area where the loading point is located by analyzing, and according to the stiffness curve, analyzing whether the anti-concavity property of area where the loading point is located is qualified or not. The anti-concavity property analysis method based on the finite element method can be used for the anti-concavity property analysis of the outer cover of a vehicle, a weak point on the outer cover can thus be accurately identified, and in the lightweight design, the structure is strengthened by simply sticking a glue film on the loading point, accordingly, the method is conducive to the lightweight design of the vehicle.

The invention relates to the field of electric motor driving and new energy commercial vehicles, in particular to an electric semi-trailer with electric driving axles. The electric semi-trailer with the electric driving axle comprises a head, a first battery, a second battery, a third battery, a semi-trailer carriage, electric driving axles and suspensions, wherein the first battery is mounted on the head; the second battery is mounted at the bottom of the head; the third battery is mounted at the bottom of the semi-trailer carriage; and the two electric driving axles are respectively arranged under the head and the semi-trailer carriage through the suspensions. According to the invention, the electric semi-trailer with the electric driving axles are dragged through the electric vehicle head and the number of the electric driving axles of the electric semi-trailer can be changed according to different deadweight capacities; the loading qualities of an electric truck and an electric logistics vehicle can be greatly improved; and meanwhile, the driving range of the electric truck can be also greatly increased.

The invention discloses a preparation method of a continuous silicon carbide ceramic fiber thermistor and relates to thermistors. The preparation method includes: using dimethyl dichlorosilane as the raw material, using metallic sodium as the reducing agent, using toluene or xylene as the solvent, dechlorinating to obtain polydimethylsilane, and pyrolyzing the polydimethylsilane under inert atmosphere to rearrange the molecular structure so as to generate polycarbosilane; loading the generated polycarbosilane into a spinning container, heating under nitrogen protection to melt the polycarbosilane, statically defoaming, and extruding to form fibers so as to obtain polycarbosilane fibers; heating the obtained polycarbosilane fibers to perform oxidation chemical crosslinking reaction to obtain crosslinking filaments which do not dissolve and melt; pyrolyzing the obtained crosslinking filaments to obtain pyrolyzed silicon carbide fibers; performing high-temperature thermal treatment on the obtained pyrolyzed silicon carbide fibers to obtain continuous silicon carbide ceramic fibers low in resistivity.

The invention relates to an electric non-bearing vehicle body comprising a vehicle frame and a vehicle body connected to the vehicle frame. The vehicle frame specifically comprises longitudinal beamsarranged on the two sides, front end structures, middle structures and rear end structures, wherein the front end structures, the middle structures and the rear end structures are arranged on the front portions, the middle portions and the rear portions of the longitudinal beams on the two sides respectively. The vehicle body comprises a vehicle main body composed of a front wall, a rear wall, a top cover, floors and B columns. The engine room position of the vehicle body is only composed of an engine room edge beam and a water tank supporting part, so that the vehicle body is simple in structure and low in weight; besides, two motor mounting brackets are arranged on the longitudinal beams on the two sides, so that the motor shell can play a role of a cross beam due to the mounting of themotor on the motor mounting brackets; besides, the frame cross beam is formed by a power battery pack shell fixedly connected with the longitudinal beams on the two sides; meanwhile, an existing framecross beam can be omitted, the overall weight of the frame is reduced, so that the lightweight design of a vehicle body can be facilitated.

The invention discloses a process for producing a modular sleeper beam for a railway carriage, which comprises the following steps of: welding a lower cover plate of the sleeper beam, a web plate, an inner clapboard and an air seat into a whole; welding anti-snake movement damper mounting beams at left and right ends of the sleeper beam; welding first and second transverse beams behind the sleeper between the anti-snake movement damper mounting beams on the rear of the sleeper beam; turning the sleeper beam, and welding an air spring base plate, a center plate mounting base plate and a vertical damper seat on the lower cover plate of the sleeper beam; and conveying a sleeper beam module to a ,machining center, and machining an air spring mounting surface, a center plate mounting surface and an anti-snake movement damper mounting surface. The sleeper beam, the first and second transverse beams behind the sleeper and the anti-snake movement damper mounting beams are welded to form an integral module, the integration degree is high, and the production efficiency is improved. After the whole module is subjected to assembly welding, the air spring mounting surface on the lower cover plate of the sleeper beam, the center plate mounting surface and the anti-snake movement damper mounting surface are subjected to unified machining and molding in the sleeper beam machining center; therefore, the machining accuracy of various mounting surfaces is guaranteed.

The invention discloses a support disconnected type fixed guide pin split brake for a hub motor. A brake disc, an upper pincer body and a lower pincer body are included, the opposite inner side facesof the upper pincer body and the lower pincer body are provided with friction plates, the two sides of the upper pincer body are provided guide pins vertical to a plane where the brake disc is located, a support separated from the brake disc is arranged outside the lower pincer body, the projection of the support in the axial direction of the brake disc is in a C shape, the direction of an openingclamped between the upper pincer body and the lower pincer body is opposite to the direction of an opening of the C-shaped support, and the guide pins are fixed to the support. The support disconnected type fixed guide pin split brake has the beneficial effects that the upper pincer body and the lower pincer body can be moved out in the radial direction of the brake disc on the premise that the support is not dismounted, the friction plates are conveniently replaced, and the assembling and maintaining efficiency of the hub motor brake is improved; and the split pincer bodies are adopted, theupper pincer body and the lower pincer body are connected through a connecting bolt, dismounting of the brake is facilitated, the size of a clamp can be better adjusted according to the change of thethickness of the brake disc.

The invention discloses a microfluidic device and a driving method thereof. The microfluidic device comprises a substrate and an electrode layer positioned on one side of the substrate, and further comprises a plurality of channels, wherein the electrode layer comprises first electrodes, second electrodes and third electrodes; each channel at least comprises a first electrode, two second electrodes, a third electrode and a barrier; each barrier has a T-shaped structure and comprises a first subsection extending in the first direction and a second subsection extending in the second direction; each barrier comprises a first barrier body positioned between the corresponding first electrode and the corresponding second electrodes; the first subsection of each first barrier body is positioned between the corresponding first electrode and the corresponding second electrodes; the second subsection of each first barrier body is positioned between the two corresponding second electrodes; each third electrode extends in the first direction; the vertical projection of each third electrode in a plane where the substrate is located is positioned in the vertical projection of the first subsection of the corresponding first barrier body in the plane where the substrate is located. According to the microfluidic device, the number of the channels can be reduced effectively, and liquid drops canbe rapidly and accurately split.

The invention discloses a server cabinet, comprising a plurality of upright columns and one support mechanism fixedly arranged on each upright column, wherein each support mechanism comprises a support piece, each support piece comprises a connecting plate fixedly arranged on the corresponding upright column, a support plate used for supporting a server module and inwards extended from the lower side of the corresponding connecting plate, and a positioning plate inwards extended from the upper side of the corresponding connecting plate and used for pushing against the corresponding server module. According to the server cabinet, one server module is supported in a sliding manner by the corresponding support mechanism, the structure is simple, and the lightweight design is facilitated.

A biomimetic skeleton type memory alloy collision buffer is disclosed. A carbon fiber composite material cover layer respectively covers the upper surface and the low surface of a NiTi shape memory alloy biomimetic skeleton, and is adhered and fixed together with the NiTi shape memory alloy biomimetic skeleton through an oxidized resin glue, to form the collision buffer; the NiTi shape memory alloy biomimetic skeleton is composed of an M-shaped NiTi alloy bracket and a grid-shaped NiTi alloy sheet, the M-shaped NiTi alloy bracket is welded on the grid-shaped NiTi alloy sheet, to form a single-layer skeleton structure, and the single-layer skeleton structures are welded layer by layer to form the NiTi shape memory alloy biomimetic skeleton. Four bolt holes are reserved in the carbon fiber composite cover layer on one side of the collision buffer, and the collision buffer is fixedly connected with other parts of the vehicle through bolts and nuts. According to the invention, the energy absorption performance of the collision buffer is improved, a large weight reduction is realized, automatic recovery after the collision load is unloaded can be realized, and the service life of the collision buffer is prolonged.

The invention relates to the field of automobiles, and discloses an three-planet-row automatic transmission and a vehicle. The transmission comprises an input component, an output component, a first planet row, a second planet row, a third planet row, a first clutch, a second clutch, a third clutch, a first brake, a second brake and a third brake, wherein the input component is fixedly connected with a second sun gear, and the output component is fixedly connected with a third planet carrier; and a second planet carrier is fixedly connected with a third gear ring, a first gear ring is fixedlyconnected with the third planet carrier, and a third sun gear is fixed. According to the three-planet-row automatic transmission, the first brake is closed to brake a first rear sun gear, the second brake is closed to brake a first front sun gear, and the third brake is closed to simultaneously brake the first planet carrier and a second gear ring; and the first rear sun gear is connected with theinput component through the first clutch, the first planet carrier is connected with the second sun gear through the second clutch, and the first planet carrier is connected with the second gear ringthrough the third clutch.

The invention discloses a fluid end of a culvert body and pump body and machine body series combined structure. The fluid end is characterized in that a culvert body of the fluid end is located in aninner cavity of a pump body by a conical surface; male threads are formed in the tail end of the culvert body; the pump body is fixed to a machine body stand plate through a splicing cap connected tothe male threads; a combined valve comprises a valve seat provided with a front valve face and a rear valve face, the valve seat is arranged in the inner cavity of the pump body and is bonded with theend face of the culvert body for forming a working cavity; a liquid inlet valve core is arranged on the rear valve face of the valve seat; a liquid inlet spring and a self-sealing adjusting spring ofa filling are integrated; and a draining valve core and a draining spring are arranged on the front valve face of the valve seat. The fluid end adopts culvert body and liquid inlet valve integrated design, so that the length of the pump body is reduced, parts and components are simplified, the useless volume is reduced, the pump efficiency is improved, the cost is reduced, and the lightweight design requirement is met.

The invention provides a crash box, an anti-collision beam and an electric automobile and belongs to the field of vehicle engineering. The crash box comprises a box body extending in a first preset direction; the cross section of the box body is of octagonal shape; the cross section of the box body is a plane perpendicular to to the first preset direction; a plurality of crumple structures are arranged on the box body; the plurality of crumple structures are arranged in the first preset direction at intervals; and each crumple structure comprises an indentation and a crumple hole on the same cross section. The anti-collision beam comprises the crash box. The automobile comprises the anti-collision beam. The crash box has the advantages that the energy absorption effect is good and the protection performance is strong. The anti-collision beam has the advantages that the anti-collision performance is excellent and the safety performance of the electric automobile can be effectively improved. The electric automobile has the advantages that the safety performance is excellent and life safeties of drivers and passengers can be effectively protected.

The invention discloses a magnetic screen for a low-power Hall thruster and a fixing structure. The magnetic screen comprises a magnetic screen body and a magnetic screen installation support, whereinthe magnetic screen body is made of a magnetic conductive material, and the magnetic screen installation support is made of a non-magnetic-conductive austenitic stainless steel material. The two parts are matched with each other through the boss, stable and reliable connection is achieved in a fusion welding mode, and meanwhile the two parts are connected with other parts in the thruster througha flanging structure on the magnetic screen installation support. A magnetic circuit structure similar to a high-power Hall thruster is realized through an idea of integrally designing the inner magnetic screen and the outer magnetic screen. And meanwhile, the ceramic channel can be fixed on an integrated structure of the inner magnetic screen and the outer magnetic screen, so that the differencebetween the axial length of the inner coil and the axial length of the ceramic channel in the low-power Hall thruster is made up.

The invention provides an LLC resonant converter capable of bidirectional operation, a primary side PWM control signal and a secondary side PWM control signal have the same switching period, so that each switching device of a primary side bridge circuit and each switching device of a secondary side bridge circuit are synchronously switched on and switched off. Optimal configuration of losses of the primary side bridge type circuit and the secondary side bridge type circuit is achieved by controlling the pulse width length of driving signals of all switching devices of the primary side bridge type circuit and all switching devices of the secondary side bridge type circuit, and then the temperature of a heat dissipation cold plate of the primary side bridge type circuit and the temperature of a heat dissipation cold plate of the secondary side bridge type circuit are controlled on line. Healthy and stable operation of the high-frequency LLC resonant converter is ensured. The invention further provides a control method of the LLC resonant converter.