32results about How to "Solve the surge" patented technology

The invention discloses an anti-surge control method of a high-pressure waste gas recycling supercharger of a diesel engine. The method includes the steps that 1, an ECU reads air inlet pressure, airinlet temperature and air flow signals of the engine, and the actual pressure ratio and air flow mass flow of the supercharger (1) are calculated; 2, whether the actual pressure ratio exceeds a critical pressure ratio of surge corresponding to the air inlet amount or not is judged, if yes, step 3 is executed, and if not, a waste gas recycling valve (4), a throttle valve (3) and the supercharger donot act; 3, the ECU reads the rotating speed and torque of the engine, and the speed change rate and torque change rate of the engine are calculated; 4, whether the speed change rate and the torque change rate of the engine exceed limit values or not is judged, if yes, step 5 is executed, and if not, the waste gas recycling valve, the throttle valve and the supercharger do not act; 6, the anti-surge state quits. According to the method, the problem of surge of the supercharger during normal running of a diesel vehicle is solved on the premise that emission and performance indexes of the engine are not reduced, and noise and moving caused by surge can be avoided.

The invention discloses a parallel variable frequency power supply for a high power and high voltage test, and belongs to the technical field of electric systems. The parallel variable frequency power supply comprises two or more parallel variable frequency power supply parts with current limiting reactors. The parallel variable frequency power supply solves the problem that a main variable frequency power supply controller decodes falsely due to the fact that the signal transmission quantity of optical fiber communication is large when two or more power supplies run in parallel; the parallel variable frequency power supply ensures that asynchronism of output voltage of the parallel variable frequency power supplies is controlled within 1 microsecond; the output synchronism of the variable frequency power supplies is improved; and circular current of output among the power supply parts is realized. In addition, as guard signals are arranged among a main variable frequency power supply and slave variable frequency power supplies, the deficiency in the prior art that when remedial operation cannot be conducted when the variable frequency power supplies fail is overcome.

The invention relates to the control field and discloses a control system and a control method used for a reaction gas compressor. The system comprises a detecting device, a control device and a reflux valve, wherein the detecting device is used for detecting a flow rate of an inlet of the reaction gas compressor; the control device is connected with the detecting device and used for comparing the detected flow rate of the inlet of the reaction gas compressor with a surging flow rate, and controlling the reflux valve of the reaction gas compressor according to the compared results; and the reflux valve is connected with the control device and used for enabling gas at an outlet of the reaction gas compressor to flow back to the inlet of the reaction gas compressor under an open condition. According to the control system and the control method disclosed by the invention, surge of the reaction gas compressor can be effectively prevented.

The invention relates to a fuel cell gas supply device and a control method thereof. The gas supply device comprises an air compressor, a humidifying unit, a galvanic pile, a first pipeline, a secondpipeline and a third pipeline; the air compressor, the humidifying unit, and the galvanic pile are successively connected; a first bypass and a second bypass are respectively arranged between the first pipeline and the second pipeline and between the first pipeline and the third pipeline; a first flow regulator and a second flow regulator are respectively arranged on the first bypass and the second bypass; and the gas supply device also comprises a control unit, the control unit is used for monitoring the pressure flow of the air compressor and the humidity of the galvanic pile and controllingthe air compressor, the first flow regulator and the second flow regulator. According to the gas supply device, through the integrated pipeline design, the surge problem of the air compressor and thewater logging problem caused by overlarge humidity of the galvanic pile can be solved at the same time, the pipeline design is simple, and the system integration degree is high.

A stall-eliminating blower for blowing or exhausting is composed of casing, motor, vane wheel and airflow collector, and is characterized by its additional reverse-flow unit, which can make the eddy flow caused by stall flow reversely back to main flow channel, so eliminating stall.

The invention discloses a control system of an air compressor of a fuel battery system. The method comprises the steps of acquiring real-time rotating speed data of the air compressor and air flow rate data; determining whether the real-time air flow rate data and the rotating speed data are within a preset surging data range; and if so, increasing the output air flow rate of the air compressor. The method has the beneficial effects that the real-time rotating speed data and the flow rate data are acquired while the air compressor runs, and that the air compressor is in a surging state can bedetermined based on the acquired data, and thus the problem of surging of the air compressor can be solved by increasing the output air flow rate of the air compressor; the method is direct and efficient; and the air compressor is prevented from secondary damage.

The invention provides a static balance valve and belongs to the technical field of valves, and the static balance valve is used for solving the problem that the handwheel of an existing static balance valve is hard to rotate, a valve core structure is complicated and the like. The static balance valve comprises a valve body the interior of which is provided with a hollow cavity, wherein the left and right sides of the valve body are respectively provided with a water inlet and a water outlet, a valve core is positioned in the valve body, and the inner end of a valve rod is connected with the valve core; the outer end of the valve rod stretches out of the valve body so as to be connected with a handwheel, the valve rod is provided with a press plate, and the valve core comprises a large valve core and a small valve core; the small valve core is fixedly connected with the inner end of the valve rod and is positioned in the large valve core, and the outer side face of the small valve core is tightly adhered to the inner side face of the large valve core; and the valve body is internally provided with a restoring spring, one end of the restoring spring props against the bottom of the valve body, and the other end of the restoring spring props against the large valve core. The static balance valve provided by the invention has the advantages that the operation is labor-saving, the problem that a large caliber valve has a small opening so as to surge is solved, and the like.

The invention discloses refrigerating equipment. The refrigerating equipment comprises a compressor, an evaporator and a condenser, wherein the compressor, the evaporator and the condenser form a refrigeration cycle, and an air inlet and an air outlet are formed in the compressor; the air inlet communicates with the evaporator through an air inlet pipeline; and the air outlet communicates with thecondenser through an exhaust pipeline. The refrigerating equipment is characterized in that the air inlet pipeline is provided with a first bypass interface; the exhaust pipeline is provided with a second bypass interface; the first bypass interface communicates with the second bypass interface through a connecting pipeline; and a control valve for opening and closing the connecting pipeline is arranged on the connecting pipeline. According to the refrigerating equipment disclosed by the invention, the connecting pipeline is additionally arranged between the conventional air inlet pipeline and the conventional exhaust pipeline, and the control valve for controlling the opening and closing of the connecting pipeline is arranged on the connecting pipeline, so that when the frequency of thecompressor is reduced, the control valve is started to balance the pressure between the air inlet pipeline and the exhaust pipeline, the pressure of a surging source is reduced, the hidden danger of surging is not generated, the service life of the compressor is prolonged, and the whole refrigerating equipment is more stable and reliable to operate.

The invention discloses a design method for adjustable guide vanes in an axial-flow gas compressor, and relates to the design method for the adjustable guide vanes. The design method aims to solve the problems of complex design and manufacturing and complex adjustment control of an axial-flow gas compressor unit with all guide vanes adjustable. The design method comprises the following steps: firstly, according to a complete-machine compression ratio of the axial-flow gas compressor, relative rotation speed of the axial-flow gas compressor or a flow adjustment change rate required by designing the axial-flow gas compressor, designing number of rows of the adjustable guide vanes; after determining the number of rows of the adjustable guide vanes, determining a specific adjustable guide vane; then, designing a turn angle rule of the specific adjustable guide vane according to the designed number of rows of the adjustable guide vanes and the specific adjustable guide vane; and finally, designing a turn angle ratio. The design method is suitable for design and manufacturing of the axial-flow gas compressor.

The invention discloses an intelligent follow-up electric energy correcting device. The intelligent follow-up electric energy correcting device structurally comprises a PLC control unit, a DSP processing unit, a servo system, an output end transmitter, an input end transmitter, an internal transmitter, a current transformer, a voltage transformer, a motor, an automatic coupling voltage regulator and an intensive intelligent capacitor, wherein the PLC control unit is connected with the output end transmitter, the input end transmitter, the internal transmitter, the DSP processing unit and the servo system, the current transformer and the voltage transformer are connected to the internal transmitter, the output end of the servo system is connected to the input end of the motor, the motor is connected with and drives the automatic coupling voltage regulator, and the automatic coupling voltage regulator is connected to the intensive intelligent capacitor. The invention further provides an indicating analysis method based on the intelligent follow-up electric energy correcting device. The method comprises the steps that according to an intelligent load cycle curve, changes of the inductive reactive power of a power grid are automatically tracked, the follow-up equivalent value of capacitive reactive power needing to be input to meet the specific control physical quantity is initiatively predicted, a control simulation curve is automatically generated, the loaded automatic coupling voltage regulator is controlled according to simulation data, the terminal voltage of a compensating capacitor is regulated, and thus an intelligent compensating power curve matched with the load cycle curve is obtained.

The invention discloses a motor which comprises a fixed impeller used for guiding air flow, and the fixed impeller comprises an impeller disc and at least two blades; the blades are spirally arrangedon the periphery of the impeller disc, and an air guide channel is limited between every two adjacent blades; the inner ends of the blades are fixedly connected with the periphery of the impeller disc, sealing parts are formed at the outer ends of the blades, and the sealing parts are in interference fit with a machine shell / fan cover of the motor. The motor has the beneficial effects that it is guaranteed that the fixed impeller and the air gathering cover or the machine shell are in an interference fit state, meanwhile, the fixed impeller is easy to assemble and not prone to being stuck or broken, the sealing effect is good, the surge problem in traditional clearance fit is solved, and the assembly problem in interference fit is also solved.

The invention provides a device interface protection circuit. The circuit comprises a first inductance module connected between the VBUS port of a device interface and the positive pole of a power supply, a second inductance module connected between the GND port of the device interface and the power supply ground, a gas discharge module connected between the VBUS port, the GND port and the protective ground, a gas discharge initiating module connected between the signal line port of the device interface, the positive pole of the power supply and the power supply ground to initiate the gas discharge module, and a bleed module arranged between the protective ground and the power supply ground. According to the device interface protection circuit provided by the invention, by constructing a common mode protection path and a differential mode protection path, the common mode and differential mode protection of the device interface can be smoothly realized; the problems of surge and electrostatic protection are solved; and the circuit has the advantages of high protection level, low clamp voltage and good reliability.

The embodiment of the invention provides a protection circuit and a variable pitch system, which are applied to a wind generating set. An input interface of the protection circuit is connected with apower supply of a variable pitch controller, and an output interface of the protection circuit is connected with the variable pitch controller. The protection circuit comprises an anti-surge protection circuit, a main protection circuit, a switching circuit and a current sensor which are connected between the input interface and the output interface. The main protection circuit is used for clamping the voltage of the control end of the switching circuit when detecting that surge occurs to the input voltage of the switching circuit, so that the output voltage of the switching circuit is limitedwithin a specified voltage range. When instantaneous overcurrent of the output current of the switching circuit is detected through the current sensor, the output current of the switching circuit islimited, or the switching circuit is controlled to be in a closed state. When the fact that the input voltage of the switching circuit is continuously overvoltage and / or the input current of the switching circuit is continuously overcurrent in a set time period is detected, the switching circuit is controlled to be in an off state.

The invention provides a protection device, a power supply device and a terminal. The protection device comprises a first overvoltage protection unit, a surge protection unit and a second overvoltage protection unit, wherein the first overvoltage protection unit, the surge protection unit, the second overvoltage protection unit and a to-be-protected unit are sequentially connected in parallel between a power supply end VBUS and a ground end in a from-near-to-far distance to the power supply end VBUS, the overvoltage protection unit and the second overvoltage protection unit are respectively used for protecting the unit which is connected in parallel between the power supply end VBUS and the ground end and is more distant from the power supply end VBUS compared with the corresponding overvoltage protection unit from being influenced by a DC voltage when the DC voltage loaded on the corresponding overvoltage protection unit is equal to or greater than a corresponding threshold, and the surge protection unit is used for protecting the unit which is connected in parallel between the power supply end VBUS and the ground end and is more distant from the power supply end VBUS compared with the corresponding overvoltage protection unit from being influenced by a surge when a voltage or a current loaded on the corresponding overvoltage protection unit generates the surge. The protection device is advantaged in that a surge problem on a VBUS line is solved, a DC high voltage problem on the VBUS line can be solved, a client withdrawal rate is reduced, and user experience is improved.

The invention discloses a discharge current controllable aviation surge protection circuit, the circuit comprises a constant current source circuit and a common TVS diode circuit, the input end of the constant current source circuit is connected with a direct current input signal, the output end of the constant current source circuit outputs a direct current signal and is connected with the common TVS diode circuit, and the output end of the constant current source circuit is connected with the common TVS diode circuit. A TVS tube is arranged in the common TVS diode circuit, and the constant current source circuit suppresses the discharge current of the common TVS diode circuit within the bearing range of the TVS tube. According to the aviation surge protection circuit with the controllable discharge current, the problem of long-time surge can be solved without a large number of TVS devices and the design of withstanding more point voltage, surge protection of the whole circuit is completed through a general front end, and the aviation surge protection circuit with the controllable discharge current can meet the requirement of safety protection. A 50V or 100V TVS is added to the power supply input end of the whole circuit to absorb a 1.2 / 50u or 8 / 20us waveform conventional surge current, and a post-stage constant current source circuit is protected.

The invention discloses a self-adaptive multi-section voltage-boosting Boost chip with an automatic current-limiting protection function, and relates to the field of analog integrated circuits. The chip comprises a signal input detection circuit, a signal amplitude comparison circuit a voltage-boosting judgment time sequence control circuit, a current limiting time sequence control circuit, a voltage-boosting gear selection circuit and a voltage-boosting main body circuit. By detecting the amplitude of the envelope of the input signal, the voltage-boosting value is dynamically adjusted in realtime, and the most suitable voltage output in the internally set multi-section voltage value is selected, so that the working efficiency of the system is improved; in addition, during the dynamic switching process of the output voltage value of the DCDC boosted chip, the built-in automatic current-limiting protection function is added, and when it is detected that the system needs to output a voltage value which is higher than the current value, automatic current limiting process intervention is achieved, so that the risk of generating a large surge current when the output voltage is switchedis overcome.

The invention relates to a design method of a turntable vane in an axial flow compressor, and the invention relates to a design method of a turntable vane. The invention aims to solve the problems of complex design and manufacture and complex adjustment and control of an axial flow compressor unit with all rotatable guide vanes. In the present invention, the number of rows of transducible vanes is firstly designed according to the overall pressure ratio of the axial flow compressor, the relative rotational speed of the axial flow compressor, or the rate of change in flow regulation required by the design of the axial flow compressor; Specific transducible vanes; then design the rotation angle law of specific transducible vanes according to the designed row number of transducible vanes and specific transducible vanes; finally design the rotational angle ratio. The invention is applicable to the design and manufacture of axial flow compressors.

The invention discloses a passive anti-surge device for a volute of a centrifugal compressor, which comprises a volute and a piston assembly; the volute is provided with an annular chamber passage hole, a gas collection annular chamber and a pre-rotation hole in sequence, and the pre-rotation hole is connected with the impeller. The inlet is connected; the piston assembly includes a casing and a piston connected to the casing through an elastic member; the casing is installed on the volute and has an internal channel; the piston is arranged in the internal channel, and the internal channels on both sides of the piston are respectively supplied with the outlet of the compressor The bypass pipeline communicates with the flow hole of the annular chamber; the piston can close and conduct the internal passage during the process of moving in the internal passage; wherein, the piston is subjected to the force formed by the pressure difference on both sides of the piston or the force exerted by the elastic member Driven by force to move automatically in the internal channel. The device uses the pressure difference on both sides of the piston and the elastic force of the elastic member to act simultaneously to automatically control the connection between the air supply bypass pipeline at the outlet of the compressor and the inlet of the impeller, eliminating the need for an active control feedback system. The invention discloses a centrifugal compressor machine.

A smoke guiding device of an aircraft gun nacelle comprises a closed-type smoke guiding structure composed of a plurality of clapboards and a smoke guiding shell. The closed-type smoke guiding structure and the aircraft gun nacelle are combined into a combination. The combination is installed on the lower portion of the front side of an aircraft air inlet passage, and an aircraft gun muzzle brake is wrapped with the combination. The clapboards are arranged in the smoke guiding shell, lower gas discharging ports are formed in the front end of the smoke guiding shell and below the smoke guiding shell correspondingly, and therefore high-temperature high-pressure waste gas originally discharged from the two sides of gun muzzle brake and the front side of the gun muzzle brake is converted to be discharged from the lower gas discharging ports in the front end of the smoke guiding shell and below the smoke guiding shell; and meanwhile, through the blocking effect of the clapboards, when the waste gas is discharged from the lower gas discharging ports of the smoke guiding shell, the waste gas quantity absorbed into the aircraft air inlet passage during aircraft gun shooting is reduced, and the problem that engine surge occurs due to the fact that the waste gas generated during aircraft gun shooting enters the aircraft air inlet passage is effectively solved, and the smoke guiding device of the aircraft gun nacelle has the characteristics of being simple in structure, low in weight and easy to install and maintain.

The invention discloses a self-adaptive multi-section voltage-boosting Boost chip with an automatic current-limiting protection function, and relates to the field of analog integrated circuits. The chip comprises a signal input detection circuit, a signal amplitude comparison circuit a voltage-boosting judgment time sequence control circuit, a current limiting time sequence control circuit, a voltage-boosting gear selection circuit and a voltage-boosting main body circuit. By detecting the amplitude of the envelope of the input signal, the voltage-boosting value is dynamically adjusted in realtime, and the most suitable voltage output in the internally set multi-section voltage value is selected, so that the working efficiency of the system is improved; in addition, during the dynamic switching process of the output voltage value of the DCDC boosted chip, the built-in automatic current-limiting protection function is added, and when it is detected that the system needs to output a voltage value which is higher than the current value, automatic current limiting process intervention is achieved, so that the risk of generating a large surge current when the output voltage is switchedis overcome.

The invention relates to the field of supersonic inlets of aircrafts, in particular to an anti-surge structure for a supersonic inlet. The anti-surge structure comprises the inlet and an anti-surge actuator mechanism, a vent port is arranged nearby the exit position of the inlet, and the anti-surge actuator mechanism is located beside the vent port in the inlet and can close the vent port. The anti-surge actuator mechanism comprises an actuator cylinder base body, an actuator piston, a stop pin, a compression spring, a blind pin, a socket and a cover plate. A piston cylinder is formed in the actuator cylinder base body, the space between the socket and the actuator piston is filled with gunpowder, the cover plate is installed at one end of the actuator piston, a stop pin hole is formed in the side face of the piston cylinder, the stop pin is pressed on the side face of the actuator piston through the blind pin and the compression spring, and the socket is linked with an ignition control signal. The anti-surge structure solves the surge problem of the inlet, overflow resistance of the inlet is reduced, an extra lift effect is provided for an aircraft, no projectile exists in the vent port, other parts on the aircraft cannot be threatened, the structure is compact and simple, and influence on performance of the inlet is small.

The invention discloses a passive anti-surge device of a volute of a centrifugal compressor. The device comprises a volute and a piston assembly. A ring casing circulation hole, a gas collecting ringcasing and a pre-rotating hole sequentially communicating are formed in the volute, and the pre-rotating hole communicates to an impeller inlet; the piston assembly comprises a housing and a piston connected to the housing through an elastic part; the housing is mounted on the volute and is provided with an inner channel; the piston is arranged in the inner channel, and the inner channel on two sides of the piston separately communicates to an outlet gas supplementing bypass pipeline of the compressor and the ring casing circulation hole; in the process that the piston moves in the inner channel, the inner channel can be closed and conducted; the piston is driven by action force formed by pressure difference between two sides of the piston or an action force applied by the elastic part tomove in the inner channel automatically. By joint action of the pressure difference between two sides of the piston and the elastic force of the elastic part, the device controls the communication condition of the outlet gas supplementing bypass pipeline of the compressor and the impeller inlet automatically, so that an active control feedback system is eliminated. The invention discloses the centrifugal compressor.

The invention discloses an automobile supercharged gasoline engine deceleration air leakage process control method and system and a vehicle. The method comprises the steps that 1, the current working condition state is judged; if the current working condition state is the rapid deceleration working condition, the engine operates a rapid deceleration working condition control mode; otherwise, the engine operates in a conventional control mode; 2, judging whether a deceleration surge control mode is entered or not; step 3, controlling the supercharger exhaust gas control valve after entering the deceleration surge control mode; 4, throttle valve torque reduction control is carried out after the deceleration surge control mode is started; 5, ignition advance angle torque reduction control is carried out after the surge control mode is entered; whether torque reduction in the speed reduction process meets the drivability target or not is judged, if the drivability target is not met, ignition angle control optimization in the torque reduction process is conducted, and if the drivability target is met, control is ended. On the premise that a supercharger ECRV bypass valve is not needed, the surge risk can be avoided, and the complexity of the system can be reduced.

The invention discloses an axial flow fan capable of achieving an accurate zero clearance. The axial flow fan comprises an impeller, a wind barrel and a motor, wherein the impeller comprises a hub connected to an output shaft of the motor, and a plurality of blades uniformly distributed on the peripheral surface of the hub; wingtips of the blades are provided with wingtip partitions; a current collector is arranged on an air inlet flange of the wind barrel; and the ends, facing the current collector, of the wingtip partitions stretch into the place between the current collector and the inner wall of the wind barrel. According to the axial flow fan, a combination of the wingtip partitions and the current collector is adopted, a zero clearance is formed between the impeller tip and the innerwall of the wind barrel, the functions of reducing noise, increasing pressure, reducing flow loss, improving device reliability and prolonging the operation life cycle of the device are achieved, operation pressure of the device is increased, blade vibration is reduced, the service life of the impeller is prolonged, the surge problem is solved, and the operation working area of the device is expanded.

A stall-eliminating blower for blowing or exhausting is composed of casing, motor, vane wheel and airflow collector, and is characterized by its additional reverse-flow unit, which can make the eddy flow caused by stall flow reversely back to main flow channel, so eliminating stall.

The invention relates to the field of engines, and discloses an engine minimum ignition density calculation method, an engine control method and an engine. The engine minimum ignition density calculation method comprises the following steps: calculating the engine minimum air inlet circulation total amount enabling the engine not to generate surge under the actual working condition according to a supercharger surge curve; and obtaining the single-cylinder circulation air inflow of the engine, and calculating the minimum ignition density of the engine according to the minimum total air inflow circulation amount of the engine, the single-cylinder circulation air inflow of the engine and the total cylinder number of the engine. According to the engine minimum ignition density calculation method, the engine control method and the engine, the minimum ignition density of the engine is calculated through the supercharger surge curve, the calibrated surge curves of an engine system adopting the same type of superchargers are the same, it is not needed to determine a MAP graph between the rotating speed and the ignition density of the engine under different working conditions through multiple repeated tests, the calibration workload is greatly reduced, and rack resources are saved; and the calculation precision of the ignition density is high, the robustness is improved, and the development cost and calibration cost of the engine are reduced.