17results about How to "Improve thrust performance" patented technology

The invention belongs to the technical field of engine design, and relates to an internal and external trajectory integrated optimization method and device of a solid engine, equipment and a medium. The method comprises the steps of obtaining design parameters of the solid engine, determining design variables, optimization targets and constraint conditions, setting an inner ballistic module and an outer ballistic module, and establishing an inner and outer ballistic integrated simulation model; sampling by adopting an optimized Latin hypercube to obtain an initial sample; according to the inner ballistic parameters of the initial sample and the design parameters of the solid engine, inputting the parameters into an inner ballistic module, and calculating engine thrust data; inputting the external ballistic trajectory parameters of the initial sample and engine thrust data into an external ballistic trajectory module, and calculating engine ballistic trajectory data; constructing a radial basis agent model according to the initial sample and the engine trajectory data; when it is judged that the radial basis agent model reaches the preset condition, the current design variable is output. According to the invention, the solid engine can be integrally optimized.

The invention discloses a design method of a bending detonation combustion chamber with a V-shaped passivated front edge, and belongs to the field of hypersonic velocity detonation engines of aircrafts. The oblique detonation engine aims at solving the problems of an existing oblique detonation engine in the aspects of detonation, standing, mixing and the like. According to the method, by determining the temperature increasing amplitude of the V-shaped front edge, the distance and flow parameters of a detached shock wave are determined by using a two-dimensional detached shock wave theory, the geometrical shape and interference type of a bent shock wave are determined based on a bent shock wave theory, and the crotch shape of the passivated V-shaped front edge is determined. And finally, constructing a geometric model and a combustion chamber geometric model according to the passivation angle and curvature of the V-shaped front edge. According to the method, the length of the engine can be effectively shortened, the formation and stability of detonation waves are improved, effective standing of the detonation waves is achieved, and normal work of the engine is guaranteed. The combustion chamber has the advantages of saving space, being easy to detonate, compact in structure and the like, and is suitable for a propelling system of a hypersonic aircraft.

The utility model relates to the field of medical auxiliary instruments, in particular to a handheld smooth massage bar with an adjustable bead stroke. The utility model provides a hand-held smooth massage bar with adjustable bead stroke, which can freely adjust the position of a massage ball, and has the advantages of convenience in operation and flexibility in adjustment. A hand-held smooth massage bar with an adjustable bead stroke comprises a bar body, a grip, an anti-falling belt, an arc-shaped scraping strip, a guide groove plate, a sliding sleeve, massage balls and the like. The sliding sleeve is unlocked by pushing the pressing piece downwards, so that a user can adjust the position of the sliding sleeve conveniently, the requirements of different massage positions are met, the massage balls can be relatively concentrated on the specified massage positions, the thrust effect in the massage process is improved, and the massage effect is improved. Meanwhile, the massage balls capable of being adjusted in position can also prevent other parts of the patient from being uncomfortable or injured in the massage process, and the flexibility of operation and adjustment is improved while the use convenience is improved.

The utility model relates to the technical field of linear transmission, in particular to a linear motor with a marble base, which comprises the marble base, two groups of guide sliding rails, a stator magnetic block, a rotor assembly and a sliding seat, the two sets of guide sliding rails are installed on the two sides of the sinking groove respectively, the multiple stator magnetic blocks are continuously arranged in the length direction of the sinking groove, the sliding seat is provided with sliding blocks, the sliding blocks are arranged on the guide sliding rails in a sliding mode, a placement groove is formed in one face of the sliding seat, the placement groove and the sinking groove are oppositely arranged, and the rotor assembly is installed in the placement groove. And the stator magnets are arranged opposite to the stator magnets. According to the utility model, the motor can still maintain high precision and stable performance during high-speed operation. The stability not only prolongs the service life of the motor, but also ensures that the motor can exert the optimal performance under various working conditions.

This invention discloses a hydrogen-ammonia fuel injector with a swirling structure. The injector includes a fuel injector housing, an ammonia inlet assembly, an electronic control assembly, a valve assembly, an air intake assembly, and an injection assembly. The injection assembly includes an injector housing, a hydrogen-ammonia interface, a fixed sleeve, a flow pipe, a sliding sleeve, a fixing block, a return spring, and a return assembly. Swirling vanes are installed inside the flow pipe, forcing liquid ammonia and hydrogen into a high-speed swirling state. Centrifugal force and shear force are used to achieve uniform mixing of the two phases, forming a homogeneous hydrogen-ammonia fuel mixture. Combined with the hyperboloidal outlet channel at the bottom of the flow pipe, the injection flow pattern is organized, achieving an integrated function of "hydrogen premixing - forced swirling mixing - injection flow pattern organization." This fundamentally solves the combustion instability problem caused by uneven mixing, significantly improves the uniformity of the hydrogen-ammonia fuel mixture, and, combined with the flow pattern organization effect of the hyperboloidal outlet, effectively improves combustion stability and fuel utilization, reducing NOx emissions and ammonia slip.

The invention discloses a valveless pulsating jet engine with an oval air inlet channel. The valveless pulsating jet engine is composed of a combustion chamber, the air inlet channel, a tail pipe, an oil nozzle and the like. An engine air inlet channel is of an oval flow channel structure, the air inlet channel and a tail pipe are arranged on the rear wall face of a combustion chamber, an oil nozzle is arranged on the rear half portion of the combustion chamber, and a nozzle directly faces an air inlet. The air inlet channel has the advantages that under the constraint of the limited engine section size, a circular flow channel is changed into an oval flow channel by changing the structural form of the air inlet channel, the air inlet amount of an engine is effectively increased, and therefore the thrust of the engine is improved.

The present invention relates to the technical field of medicine frying equipment, and specifically to an electromagnetic medicine frying machine with controllable discharging, comprising an electromagnetic medicine frying machine body, in which a rotating medicine frying cylinder is rotatably installed, and further comprising: a control partition cylinder, which is located in the rotating medicine frying cylinder and is rotatably connected to the inner wall of the rotating medicine frying cylinder, and a medicine frying space is enclosed between the rotating medicine frying cylinder and the control partition cylinder; a controllable discharging port, which is installed on the side wall of the rotating medicine frying cylinder and is arranged opposite to the medicine frying space; and a discharging control mechanism, which comprises a telescopic range driving component, two telescopic columns and a pushing frame; the electromagnetic medicine frying machine with controllable discharging of the present invention can ensure that the medicines are fully fried, while allowing the medicines of different sizes to be discharged from the outside of the equipment in sequence, so as to avoid some of the medicines being overheated and fried, which affects the subsequent use and the medicinal properties of the medicines.

The invention relates to the technical field of motors, and provides a planar motor with an iron core structure, the planar motor comprises a stator component, a rotor component and an air floatation component, the stator component comprises a permanent magnet array and a fixed plate, the fixed plate is arranged on one side of the permanent magnet array, and an air floatation surface is formed on the surface of one side, far away from the permanent magnet array, of the fixed plate; the mover part can be movably arranged on one side of the fixing plate along the air floating surface, the mover part comprises a coil and an iron core, and the coil is arranged outside the iron core in a sleeving mode; the air floatation component and the rotor component are relatively fixed, and the air floatation component carries out air floatation supporting on the rotor component. Through the arrangement, the iron core provides a magnetic conduction path, the magnetic flux of the permanent magnets and the coil is increased, the electromagnetic coupling strength is enhanced, the thrust performance of the planar motor is improved, the number of the permanent magnets is reduced, and the cost is reduced. And the magnetic attraction force exists between the iron core and the permanent magnet array, so that the preloading force can be provided for the air floatation component, the air floatation component is prevented from being configured with an independent preloading component, and the compactness of the planar motor is improved.

The invention discloses a primary-secondary three-area V-shaped hybrid permanent magnet linear stepping motor, which adopts a bilateral flat structure with a middle secondary and two side primary, air gaps exist among a first mover, a stator and a second mover, and the first mover and the second mover are symmetrical about the stator; the first mover and the second mover are the same in structure and each comprise a plurality of T-shaped iron cores, and a V-shaped hybrid permanent magnet structure is arranged between every two adjacent T-shaped iron cores. The stator comprises a salient pole iron core with a plurality of small teeth, a V-shaped permanent magnet structure C is arranged in the salient pole iron core, neodymium iron boron permanent magnets O are embedded in small grooves of the salient pole iron core at intervals, and the neodymium iron boron permanent magnets O on the upper side and the lower side are distributed in a staggered mode. The motor is of a five-phase hybrid permanent magnet structure, and has the advantages of being large in thrust density, high in thrust quality, high in power density, high in positioning precision, high in loading capacity, high in efficiency, high in reliability and the like. The thrust density and the loading capacity can be further improved by changing the magnetization level of the aluminum-nickel-cobalt permanent magnet and adjusting the air-gap magnetic field.

The present application belongs to the field of engine design technology, and relates to a method, device, equipment and medium for optimizing the internal and external trajectories of a solid engine. The method includes: obtaining the design parameters of the solid engine, determining the design variables, optimization objectives and constraints, setting the internal ballistic module and the external ballistic module, and establishing an integrated simulation model of the internal and external ballistics; using optimized Latin hypercube for sampling to obtain an initial sample; according to the internal ballistic parameters of the initial sample and the design parameters of the solid engine, input the internal ballistic module to calculate the engine thrust data; according to the external ballistic parameters of the initial sample and the engine thrust data, input the external ballistic module to calculate the engine ballistic data; according to the initial sample and the engine ballistic data, construct a radial basis proxy model; when it is judged that the radial basis proxy model meets the preset conditions, output the current design variables. The present application can be used to optimize the solid engine in an integrated manner.

The invention discloses a liquid ammonia and aviation kerosene dual-fuel hybrid turbofan engine combined with a fuel cell for power generation, which belongs to the technical field of aero-engines and comprises a traditional turbofan core machine, a liquid ammonia fuel subsystem, an aviation kerosene fuel subsystem and a fuel cell power supply subsystem, and the liquid ammonia fuel subsystem, the aviation kerosene fuel subsystem and the fuel cell power supply subsystem are integrated. Liquid ammonia is conveyed to the liquid ammonia preheater through the fuel pump, absorbs heat of air from an outlet of the low-pressure compressor and is vaporized, and cooling of air at an inlet of the high-pressure compressor is achieved; vaporized ammonia gas enters an ammonia gas decomposition hydrogen production device which annularly sleeves the outer wall of the exhaust nozzle, and is catalytically decomposed into hydrogen gas by utilizing waste heat of the exhaust nozzle; high-temperature mixed gas generated by decomposition enters an aviation fuel preheater for preheating aviation fuel and then is conveyed to an anode of the proton exchange membrane fuel cell; and meanwhile, part of the air cooled by the liquid ammonia preheater is conveyed to the cathode of the fuel cell through a pressure reducing valve. The thrust loss caused by extracting power from the main shaft of the engine is avoided, and the energy comprehensive utilization efficiency of the whole engine is remarkably improved.

This utility model discloses a metering concentric screw valve, including a housing containing a motor; a valve body, with a rotor located at the axial center of the valve body at the output end of the motor. A coupling connects the rotor to the output end of the motor, transmitting the torque generated by the motor output to drive the rotor to rotate. The rotor consists of an integral rod body and rod head, with a double-threaded portion formed on the surface of the rod body. In this utility model, increasing the length of the rotor effectively adjusts the internal spatial layout of the cavity, allowing for smoother flow of adhesive within the cavity and a more uniform pressure distribution, thereby reducing the internal pressure and decreasing the possibility of adhesive leakage due to pressure. Furthermore, the rotor's thread structure is optimized and upgraded, changing the original single-layer thread structure to a double-layer thread structure, which provides a stronger force during rotor rotation.

The utility model discloses a flat plate type permanent magnet linear motor adopting alternating tooth profiles, and belongs to the technical field of motors. Stator teeth of a stator core of the flat plate type permanent magnet linear motor are combined teeth, the combined teeth are composed of straight teeth and tooth-shaped teeth, and the straight teeth and the tooth-shaped teeth are alternately arranged in the Z-axis direction and are manufactured into a whole. The structures of two adjacent combined teeth of the stator core are the same or different; or, two adjacent stator teeth of the stator core are different in structure and adopt an alternately changing tooth-shaped structure, one stator tooth is a straight tooth, and the other stator tooth is a tooth-shaped tooth. According to the utility model, the stator tooth structure of which the tooth forms are alternately changed is adopted, and different tooth structures are integrated; wherein one part of teeth with tooth shapes can make up for the defect of low thrust density of straight teeth when a magnetic circuit is not saturated, the other part of straight tooth structures can make up for the defect of poor overload capacity of tooth structures with tooth shapes when the magnetic circuit is saturated, and the two tooth structures complement each other, so that the thrust characteristic of the motor is well balanced.

7. The swiftly and minutely adjusting device for a wood-planer working table as claimed in claim 1, wherein the adjusting device is arranged on a platform with a movable base and a clamping member arranged on the platform for processing the workpiece, and the adjusting device is arranged on the platform for carrying out the work of the machine.

The invention relates to an ultrahigh-pressure-ratio compact efficient energy-saving turbojet engine which comprises a main body part, a two-stage supercharging unit, a three-stage supercharging combustion unit and a reel structure connecting pipeline system. The reel structure connecting pipeline system comprises a first reel structure connecting pipeline, a second reel structure connecting pipeline, a third reel structure connecting pipeline and a fourth reel structure connecting pipeline. Along with the increase of the supercharge ratio, combusted gas expands and does work more sufficiently in the turbine, heat energy generated after fuel is combusted is converted into mechanical energy more effectively, the fuel oil heat efficiency is greatly improved, the fuel oil economical efficiency is improved, and fuel oil consumption is greatly reduced.

The invention relates to the technical field of herbal medicine roaster equipment, in particular to a discharging-controllable electromagnetic herbal medicine roaster which comprises an electromagnetic herbal medicine roaster body, a rotary herbal medicine roaster cylinder rotationally mounted in the electromagnetic herbal medicine roaster body, and a control partition cylinder located in the rotary herbal medicine roaster cylinder and rotationally connected with the inner wall of the rotary herbal medicine roaster cylinder. A medicine frying space is defined by the rotary medicine frying cylinder and the control partition cylinder; the controllable discharging opening is formed in the side wall of the rotary medicine frying cylinder and is arranged right opposite to the medicine frying space; the discharging control mechanism comprises a telescopic amplitude driving assembly, a second telescopic column rod and a pushing and pressing frame body. According to the electromagnetic herbal medicine roaster capable of controlling discharging, medicinal materials with different sizes can be discharged out of the equipment in sequence while sufficient stir-frying of the medicinal materials is guaranteed, and the situation that subsequent use and medicine properties of the medicinal materials are affected due to the fact that part of the medicinal materials are excessively heated and stir-fried is avoided.

A control device for a sudden thrust change of a wide-range ramjet engine is provided, comprising an upstream wall surface (1), a concave cavity (2), a downstream wall surface (3), a front wall surface (4), a rear wall surface (5), a left wall surface (6), a right wall surface (7), a lower wall surface (8), a left mounting hole (9) and a right mounting hole (10); the entire device is in an equal-width outward expansion configuration. A control method for a sudden thrust change of a wide-range ramjet engine is also provided. The present invention controls the sudden thrust change characteristics of a wide-range ramjet engine through a plasma-assisted jet, thereby achieving a smooth change in the thrust of a wide-range ramjet engine and improving the working stability of the engine. The use of left and right plasma-assisted ejectors for controlling the sudden thrust change of a wide-range ramjet engine can ensure sufficient fuel combustion, thereby improving the thrust performance of the engine.