30results about How to "Simple pressure control" patented technology

The present invention proposes a variable winding starter generator, which includes rotor core, stator core, coil, shaft and casing, etc., and is characterized in that each stator pole has a centralized coil with one m-turn and one n-turn; when the When the variable-winding starter-generator used for automobiles is used as a starter, the switch connects all the coils on the stator poles with the same phase in series to form a phase armature winding, and each phase armature winding is connected to an asymmetrical half-bridge with a body diode After the converter, it can run electrically in the switched reluctance motor mode; when the automobile variable winding starter generator is used as a generator, the n-turn coils on all stator poles are connected in series to form an excitation winding, and the stator poles with the same phase The m-turn coils on the upper part are connected in series or in parallel to form a phase armature winding, and the starter generator operates in the mode of electric excitation double salient pole generator to generate electricity. The starter generator of the invention can effectively utilize the advantage of relatively high efficiency of the switched reluctance motor, and also effectively utilize the advantages of simple voltage regulation and control of the electrically excited double salient pole generator.

The invention discloses a bidirectional DC-DC converter mixed with LLC and DAB, which comprises an H-bridge circuit, two LLC resonant cavities, two isolation transformers with the same conversion ratio and a three-phase half-bridge full-control circuit; , the two ends of the H-bridge circuit and two series-connected split resonant capacitors are connected to both ends of the input power supply, the original side of the isolation transformer with the same name is connected to one end of the resonant inductor of the resonant cavity, and the other end of the resonant inductor is connected to the neutral point of the half-bridge of the H-bridge circuit , the same-named end of the secondary side of the isolation transformer is connected to the neutral point of the bridge arm of the three-phase half-bridge full-control circuit; the non-identical end of the two isolation transformer secondary sides are connected to the neutral point of the bridge arm of the three-phase half-bridge full-control circuit. The invention utilizes the advantages of LLC frequency conversion and voltage regulation and DAB phase-shift voltage regulation, combined with PWM pulse 180º phase-shift to realize fast switching between LLC and DAB, realizes optimal control of efficiency under different load rates or voltage gains, has small switching loss, high efficiency, The advantage of simple structure.

The invention provides a compound-driven two-stage projectile accelerating device and an experimental platform. The accelerating device includes a primary accelerator and a secondary accelerator. The primary accelerator includes a solenoid valve connected to a high-pressure gas source, and the head end of the solenoid valve and the shell Connection, a piston is built in the casing, and a manual valve is connected to the casing, and the piston is reset by opening the lower manual valve and the upper manual valve; the secondary accelerator includes a secondary accelerator frame, an acceleration pipeline, and at least one The slide rail and at least one set of electric motors, the solenoid valve controls the release of high-pressure gas, and pushes the piston to accelerate. The piston pushes the projectile for a primary acceleration and enters the acceleration pipeline of the secondary accelerator. The motor drives the flywheel to rotate through friction to form a secondary accelerate. The invention uses high-pressure gas and electric motor as the source power, accelerates the elastic body through a two-stage acceleration mechanism, injects it into the water tank at high speed from the acceleration pipeline, and sets a high-speed camera outside the water tank to record the test process.

Disclosed is a rotary damper type hydraulic buffer system, comprising a rotary damper, a first oil path and a second oil path, wherein the rotary damper comprises a stator, a rotor and a hydraulic chamber formed between the stator and the rotor; a first oil duct and a second oil duct are formed on the stator, and the hydraulic chamber comprises a first chamber and a second chamber which are respectively in communication with the first oil duct and the second oil duct; when the rotor rotates anticlockwise, a hydraulic oil in the first chamber is compressed, so as to enter the second chamber via the first oil duct, the first oil path and the second oil duct from the first chamber; and when the rotor rotates clockwise, the hydraulic oil in the second chamber is compressed, so as to enter the first chamber via the second oil duct, the second oil path and the first oil duct from the second chamber. The rotary damper type hydraulic buffer system of the present invention has a high level of integration and a good buffer effect; and two seals of an oil suction valve with an end surface and an axial plane ensure that the phenomenon of leakage will not occur.

The invention discloses a wide-voltage isolated DC-DC converter with an automatic current limiting function, which includes two half-bridge circuits, two sets of LLC resonant cavities, two sets of voltage clamping diode pairs, and two synchronous conversion ratio Isolation transformer and three-phase bridge circuit; Among them, the two half-bridge circuits are connected to their respective input power supplies, the primary side of the isolation transformer is respectively connected to one end of the resonant inductor of the corresponding LLC resonant cavity and the neutral point of the half-bridge circuit, and the other end of the resonant inductor is connected to 2 The center point of a split resonant capacitor, the voltage clamping diode is connected in parallel with the split resonant capacitor; the secondary side of the isolation transformer is connected in series with reverse polarity, and the three nodes of the transformer group are respectively connected to the neutral point of the three-phase bridge circuit after series connection; The invention utilizes the advantages of LLC frequency conversion and voltage regulation, combined with PWM pulse 180º phase shift to realize fast switching between series and parallel, realizes fast adjustment of rated voltage and 2 times rated voltage output, and has the advantages of small switching loss, high efficiency and simple structure.

The invention provides a preparing method of aromatic polycarbonate. According to the invention, aromatic polycarbonate is prepared via reaction between aromatic dyhydroxy compound and carbonic acid diaryl ester. The method comprises following steps of (A) supplying the carbonic acid diaryl ester of 90 DEG C-220 DEG C to a mixing groove, wherein the supply quantity of the carbonic acid diaryl ester is 75m%-99m% of total supply quantity of the carbonic acid diaryl ester solved via target molar ratio of the aromatic dyhydroxy compound and the carbonic acid diaryl ester; (B) after the step A, supplying the aromatic dyhydroxy compound to the mixing groove whose liquid temperature is adjusted to 135 DEG C-220 DEG C; and (C) after the step (B), further supplying the carbonic acid diaryl ester to the mixing groove so as to allow the molar ratio of the aromatic dyhydroxy compound and the carbonic acid diaryl ester to be in a regulated range, thereby preparing dissolution mixture.

The invention relates to a variable damping control and buffering system, which belongs to the technical field of hydraulic buffering, and includes a first hydraulic cylinder and a second hydraulic cylinder, as well as a base pressure regulating valve, a first pressure regulating valve, a second pressure regulating valve, a first one-way valve, a second one-way valve, a first one-way overflow valve and a second one-way overflow valve, wherein a second hydraulic cylinder rodless cavity, a first hydraulic cylinder rod chamber, the first pressure regulating valve, the first one-way valve, the base pressure regulating valve, the first one-way overflow valve, a second hydraulic cylinder rod chamber, a first hydraulic cylinder rodless cavity are sequentially connected in series to form a first oil circuit; and the first hydraulic cylinder rodless cavity, the second hydraulic cylinder rod chamber, the second pressure regulating valve, the second one-way valve, the base pressure regulating valve, the second one-way overflow valve, the first hydraulic cylinder rod chamber and the second hydraulic cylinder rodless cavity are sequentially connected in series through a pipeline to form a second oil circuit. The variable damping control and buffering system has unique design, convenience for maintenance, capability of damping regulation and control, and the functions of locking and safety protection.

The invention discloses an ultra-wide voltage range isolation type LLC converter, comprising two high-voltage side H bridge circuits, two LLC resonant circuits, two isolating transformers with the same transformation ratio and three-phase bridge circuits; The H-bridge circuit on the high-voltage side is connected to the power supply at the input end, and the primary side of the isolation transformer is connected to the midpoint of the LLC resonant circuit and the H-bridge circuit respectively; the secondary side of the isolation transformer is connected in series in reverse polarity, and the three nodes of the transformer group are connected in series. to the neutral point of the three-phase bridge circuit; the invention utilizes the advantages of LLC frequency conversion and voltage regulation, and combines the 180º phase shift of the PWM pulse to realize fast switching between series and parallel, which can realize the output voltage adjustment in a wide range, and at the same time play the role of the PWM rectifier within a certain safety range. The invention has the advantages of small switching loss, high efficiency, high power density of the power supply and small volume.

The invention discloses a one-way pressure release valve suitable for the pressure control in a spacecraft cabin. The one-way pressure release valve suitable for the pressure control in the spacecraftcabin comprises a valve body, a sealing gasket, a piston, a spring, a transition flange, a compression nut and an adjusting nut. When the one-way pressure release valve is initially at a close state,a pressure release point of the valve can be adjusted on a ground stage according to the requirement on the pressure in the returning cabin of a spacecraft. According to the one-way pressure releasevalve suitable for the pressure control in the spacecraft cabin, pressure release and closing are automatically realized through the way that a pressure sensing element senses a pressure difference ofan inner environment and an outer environment of the returning cabin; and the one-way pressure release valve suitable for the pressure control in the spacecraft cabin has closing and heat protectionfunctions, the spacecraft weight is light, resource consumption is less, and the pressure control mode is simple.

Disclosed is a fast steam generation system for a horizontal type side-combustion type coiler structure. The fast steam generation system comprises a water processing system, a heat exchanger, a steam-water separator and a combustion system. The water processing system is a vacuum deaeration water supply system composed of a sodium and magnesium ion exchanger, a steam exhaust condenser, a vacuum deaeration pump and a vertical type vacuum deaeration water tank which is connected with a boiler water feed pump. The heat exchanger comprises a coiler device of a horizontal type structure. The coiler device is formed through series connection of a plurality of layers of sequentially arranged mosquito coil flat coilers and spiral-spring-shaped coilers. The spiral-spring-shaped coilers are tightly abutted in the coiler device so as to form a cylindrical combustor, and a convection heated face is formed on the multiple layers of mosquito coil flat coilers. A heating device of the combustion system is installed on the outermost side of the cylindrical combustor. The heads of the mosquito coil flat coilers are provided with cold water inlets. The tails of the spiral-spring-shaped coilers are provided steam-water mixture outlets. The cold water inlets are connected with the boiler water feed pump. The steam-water mixture outlets are connected with the steam-water separator.

The invention relates to a pressurizing and locking hydraulic buffer system, belonging to the field of hydraulic buffer. The system comprises a hydraulic cylinder and an oil storage tank, wherein the hydraulic cylinder comprises a cylinder sleeve, a piston and a piston rod; the hydraulic cylinder is divided into a first chamber and a second chamber by the piston; a first oil extraction oil line and a first oil absorption oil line are communicated by virtue of the first chamber and the oil storage tank; the pressurizing and locking hydraulic buffer system also comprises at least one overflow valve, at least one electromagnetic valve and at least one hydraulic damp; and the overflow valve and the electromagnetic valve are connected in parallel in the first oil extraction oil line and a second oil extraction oil line. The supercharging and locking hydraulic buffer system provided by the invention has the advantages of skillful design, simple and compact structure, low failure rate and good buffer effect; through setting the constant hydraulic damp, the resistance force buffer effect is achieved in proportion to the cornering speed of a vehicle; and as the overflow valve is arranged, the vehicle is enabled to be provided with the functions of super angle locking and safe protection.

The invention relates to a water turbine pole iron-core press-fit method which comprises positioning step, pressurization step, pressure-keeping step and welding step, wherein the welding step is to weld a product tension rod penetrating in the screw hole of the stamped steel of the pole iron-core with end plates on two ends of the pole iron-core; the positioning step is to position the stamped steel of the pole iron-core at the two lower shoulder blades of the pole iron-core; and the pressure-keeping step is to pressurize and keep the pressure of the pole iron-core with a hydraulic device atthe two upper shoulder blades of the pole iron-core and double T-shaped tails. The water turbine pole iron-core press-fit method has the advantage that the process is simple, the control is easy, thehumping of the pole iron-core can be avoid, the advantage--straightness of the pole iron-core can be ensured, and the quality of the pole iron-core of the water turbine can be increased.