23results about How to "Reliable start" patented technology

The invention relates to the technical field of power system protection, relates to a micro-grid protection method based on measured impedance amplitude-phase variation, and provides a protection method based on measured impedance amplitude-phase variation for the protection problem of a micro-grid containing an inverter distributed power supply (IIDG). According to the method, voltage and current measured values at the two ends of a protection circuit in the micro-grid are collected in real time, a criterion is started by using voltage drop and phase current abrupt change to judge a fault, and a criterion of a measured impedance module value is adjusted by combining a zero-sequence current detection result. And when a module value criterion is met, further determining a fault section by adopting a phase angle criterion. And if the communication fails or the data is lost, self-adaptive over-current backup protection or zero-sequence current measurement is started to carry out fault positioning. The method can adapt to the grid-connected operation mode and the off-grid operation mode of the micro-grid, the fault type and the fault section are accurately judged, safe and stable operation of the micro-grid is ensured, protection sensitivity and selectivity are improved, and the method has important practical application value.

The utility model relates to a flat aerosol fire extinguishing device with a high protection grade, which comprises an upper cover and a lower cover which are combined to form a hollow cavity, and a starting component and a fire extinguishing agent grain are sequentially arranged in the hollow cavity from the center to the periphery; the multiple fire extinguishing agent grains are arranged in the circumferential direction of the starting component at intervals, and the starting component is tightly attached and fixed to the center of the hollow cavity through the multiple fire extinguishing agent grains. The fire extinguishing device has the beneficial effects that the whole device is flat in appearance, the requirement of installation in a narrow space is met, and meanwhile, the fire extinguishing device has a relatively high IP protection grade on the premise that the spraying fire extinguishing performance of the fire extinguishing device is not influenced; and the starting is reliable in high-temperature, low-temperature, high-humidity and other complex environments.

The invention discloses a starting method of a permanent magnet synchronous motor without a position sensor, which relates to the field of motors and comprises the following steps of: 1, determining an initial position of a motor rotor; 2, an IF linear function curve is set, the independent variable of the IF linear function curve is frequency (rotating speed), the dependent variable of the IF linear function curve is current, and a motor is dragged to rotate; step 3, the given operation frequency is gradually reduced, and meanwhile, the current given value is also reduced, so that the angle estimated by the observer slowly coincides with the open-loop angle; and step 4, when the rotating speed of the motor reaches a second threshold rotating speed and the difference between the open-loop angle and the angle observed by the observer is smaller than a second set value, compared with the prior art, the method has the beneficial effects that an IF current closed-loop and rotating speed open-loop quick starting strategy is provided, the transition stage switching between open-loop starting and closed-loop control is smooth, and the stability of the motor is improved. The motor operation effect is good, the current is effectively controlled, and the starting is reliable under the condition of voltage fluctuation.

The switching power supply protection circuit and power supply system proposed in this application include: a control module; a charging circuit, the input terminal of which is connected to the switching power supply, the output terminal of which is connected to a capacitor, and the charging circuit is communicatively connected to the control module; and a parallel switch, the first terminal of which is connected to the output terminal of the charging circuit, the second terminal of which is connected to both the output terminal of the charging circuit and the load output terminal, the switching power supply being connected to the load output terminal, and the parallel switch being communicatively connected to the control module. When the switching power supply is powered on, the control module controls the parallel switch to be in the open state and starts the charging circuit to charge the capacitor. When the voltage of the capacitor is detected to reach a preset voltage threshold, the control module also controls the parallel switch to be closed, so that the switching power supply and the supercapacitor supply power to the load output terminal in parallel, significantly improving the safety, reliability, and stability of the entire power supply system.

This application belongs to the field of turbofan engine starting design technology, specifically involving a turbofan engine backwind starting method, including: Step 1, identifying whether the turbofan engine is starting under high-speed backwind conditions by whether the low-pressure rotor reverses; if the low-pressure rotor reverses, the turbofan engine is identified as starting under high-speed backwind conditions; Step 2, after identifying that the turbofan engine is starting under high-speed backwind conditions, determining the wind pressure resistance PdX of the turbofan engine starting under high-speed backwind conditions by the low-pressure rotor reverse rotation speed and the correspondence between the low-pressure rotor reverse rotation speed and wind pressure resistance; Step 3, after the low-pressure rotor changes from reverse rotation to forward rotation under the starter motor, reducing the nozzle throat area A8, adjusting the nozzle exit area A9 and vector angle δA9 to shield the nozzle throat, increasing the ignition speed to ignite the turbofan engine, and increasing the fuel supply speed to supply fuel to the turbofan engine, thereby starting the turbofan engine.

This utility model relates to a flow meter calibration device with reusable functionality, belonging to the technical field of flow meter testing equipment. It includes a water storage tank and a metering tank. The water storage tank is connected to workshop production water, and an inlet pipe connects the workshop production water to the water storage tank. A pipeline centrifugal pump is installed between the water storage tank and the metering tank. A pumping pipe connects the pipeline centrifugal pump to the lower part of the water storage tank, and a calibration delivery pipe connects the pipeline centrifugal pump to the upper end of the metering tank. The calibration delivery pipe is equipped with a calibration table and a standard table. It features water conservation and environmental protection, high accuracy, high automation, compact structure, and good operational stability. By using a relatively fixed calibration device, the flow meter calibration process is simplified, achieving more accurate calibration results.

This invention discloses a multi-satellite mission planning system and method, belonging to the field of on-board mission planning. The mission planning module allocates at least one execution satellite for each specified mission based on the mission request, the current orbital information of each satellite, and current resource information, generating a mission planning scheme. When the cloud core node establishes communication with any execution satellite, it generates the corresponding mission instruction and sends it to the edge core node of that execution satellite. When the edge core node establishes communication with the ground terminal, it receives and parses the mission instruction from the ground terminal and registers the timing trigger information to the local timing scheduler. The edge core node, through the local timing scheduler, creates and runs the container image of the corresponding specified mission when the planned execution time arrives, to execute the specified mission. This invention overcomes the problem of mission triggering and timing control being impossible due to the inevitable interruptions and delays in satellite-to-ground communication.

The invention provides a compressor assembly and an air conditioning unit. The compressor assembly comprises at least two compressors; a gas-liquid separator; a suction manifold; an oil separator; a turbulent flow structure is arranged between the communicating position of the oil return pipe and the air suction main pipe and the second end of the air suction main pipe. According to the compressor assembly and the air conditioning unit, the turbulent flow structure is arranged on the air suction main pipe, refrigerant oil can be forced to be dispersed under the turbulent flow effect of the turbulent flow structure after entering the air suction main pipe, the dispersed refrigerant oil can be evenly distributed in the air suction main pipe, and then the refrigerant oil is evenly distributed into all compressors through flow distribution of the flow distribution piece; therefore, the problem that refrigerant oil is accumulated on the side wall of the air suction main pipe in the prior art is avoided, reliable oil return of all compressors is guaranteed, particularly, the problem that a certain compressor is lack of oil when the compressors are started under the low-temperature condition can be avoided, reliable starting of all the compressors is guaranteed, and the service life of the compressors is prolonged. And the working reliability of the compressor and the air-conditioning unit is improved.

The invention provides a system and a method for producing an organic fertilizer through solid waste three-section horizontal rotary fermentation recycling, and belongs to the technical field of agricultural waste recycling treatment. The problems that when the environment temperature of a traditional single tank is lower than-20 DEG C, the temperature rise of materials is slow, the microbial activity is low, a system seriously depends on high-energy-consumption electric auxiliary heating to maintain operation, and the operation cost is increased are solved. The system comprises a preheating starting tank, a drying deodorization tank, a decomposition deodorization tank and a heat recovery unit, the preheating starting tank, the drying deodorization tank and the decomposition deodorization tank are sequentially connected in the material conveying direction, and the heat recovery unit comprises a first heat exchanger, a second heat exchanger and a heat pump unit. The first heat exchanger is arranged between an air outlet of the preheating starting tank and an air inlet passage of the drying deodorization tank, the second heat exchanger is arranged on an air outlet passage of the drying deodorization tank, and an evaporator inlet of the heat pump unit is connected with the intersection of an air outlet of the second heat exchanger and an air outlet of the decomposition deodorization tank. The method is mainly used for agricultural waste treatment.

This utility model relates to a hybrid control system for a DC motor, comprising a control unit and a drive circuit. The input and output terminals of the drive circuit are electrically connected to the output terminal of the control unit and the DC motor, respectively. The system also includes a Hall effect sensor module and a current sampling circuit. The Hall effect sensor module includes three Hall effect sensors, and its signal output terminal is electrically connected to the first set of signal input terminals of the control unit. The current sampling module includes three sets of differential operational amplifier circuits, with their input terminals electrically connected to the output terminals of the drive circuit and their signal output terminals electrically connected to the second set of signal input terminals of the control unit. This system solves the problem of system failure caused by a single point of failure of the Hall effect sensor through an integrated fault detection and switching mechanism, thereby achieving a balance between reliable startup, high-precision operation, and high redundancy.

The invention provides a converter control method and device, control equipment and a converter, and belongs to the technical field of power supplies. The converter comprises at least one inversion module, and the inversion module comprises a negative direct current switch and a first buffer unit; the first buffer unit comprises a first buffer switch and a first buffer resistor which are connected in series; the left and right sides of the first buffer unit and the left and right sides of the negative DC switch are respectively provided with a first grounding branch and a second grounding branch, and the first grounding branch and the second grounding branch are provided with Y capacitors and are connected with the same reference ground. The method comprises the following steps: when an inversion module is controlled to work, controlling a negative direct current switch to be closed; and after the negative direct-current switch is detected to be closed, the first buffer switch is controlled to be closed. According to the invention, generation of large impact current can be avoided, reference ground voltage bounce caused by the large impact current can be avoided, stable and reliable starting of the inversion module can be realized, and the safety of each device in the inversion module is protected.

The utility model discloses a small turbojet engine cannon type starting system which comprises a gunpowder starter, the gunpowder starter comprises a shell, the shell is fixed with an outer shell, two ends of the shell are provided with openings, and a first cavity and a second cavity communicated with the first cavity are arranged in the shell; the gunpowder tube is mounted in the first chamber; the ignition powder tube is mounted in the second cavity; the igniter is connected with the opening in one end of the shell, and the igniter is matched with the ignition powder tube; the end socket is connected with the opening in the other end of the shell, and a drainage hole is formed in the end socket; one end of the nozzle is connected with the end socket, and the other end of the nozzle penetrates through the through hole in the outer shell and the guider to be in clearance fit with the turbine. According to the utility model, the small turbojet engine can be quickly started in the air.

The embodiment of the invention provides a heat pump preheating control method and device, an air source heat pump and a computer readable storage medium, the heat pump preheating control method comprises a compressor and a preheating module, and the heat pump preheating control method comprises the steps that in response to a starting instruction received by the heat pump, whether the compressor starting condition is met or not is determined; in response to determining that the compressor starting condition is not met, executing circulating preheating operation until the compressor eliminates the starting fault; the circulating preheating operation comprises the steps that the compressor is controlled to be stopped or stopped, and the preheating module is controlled to preheat the compressor; and the compressor is controlled to be started, and whether the compressor has a starting fault or not is determined.

A life jacket for sea rescue belongs to the technical field of water rescue equipment and solves the problem of rescue delay caused by the fact that a traditional life jacket cannot automatically and accurately detect a drowning state and a user posture. According to the technical scheme, a water pressure sensor is arranged on a life jacket body, a buoyancy providing device comprises a front buoyancy cavity set, a rear buoyancy cavity set and a gas distribution valve, and an integrated control device processes sensor data through a microprocessor, starts a monitoring mode after detecting water entry and analyzes starting sequence inflation according to posture changes or active struggling; and automatic positioning is carried out and a distress signal is sent when the danger is continued. The device is mainly used for sea drowning rescue.

The application provides a high-compression-ratio ethanol fuel gasoline engine combustion system and a control method thereof, wherein the system comprises: a high-compression-ratio combustion structure with a compression ratio of 14-15, the combustion structure comprises a piston top with an omega-shaped shallow pit structure, and the surface of the piston top is provided with a silicon nitride ceramic coating; a cold start enhancement system comprising a PTC ceramic heating module and a high-energy ignition device; a fuel injection system comprising a high-pressure common rail system and a multi-hole swirl oil injector; and a control system comprising an ECU control unit and a UEGO wide-range oxygen sensor. The high-compression-ratio ethanol fuel gasoline engine combustion system and the control method thereof can realize high thermal efficiency, reliable start at low temperature, stable combustion and low emission.

The application belongs to the technical field of household appliances, and particularly relates to a starting control method of a heat pump water heater, the heat pump water heater and a storage medium, and is used for solving the technical problem of lacking the starting control method of the air source heat pump water heater in multiple different modes. The starting control method comprises the following steps: determining whether the starting condition of the set starting mode is met according to the preset target temperature and the corresponding actual temperature in the set starting mode; if the starting condition of the set starting mode is met, switching the four-way reversing valve to the corresponding communication state according to the set starting mode, and adjusting the first control valve, the second control valve and the third control valve to the preset opening degree. The application can improve the stability and reliability of the heat pump water heater when starting in multiple different modes.

The invention belongs to the technical field of aircraft power system design, and particularly relates to an aircraft hybrid power system and a control method thereof.The aircraft hybrid power system comprises a main engine, a ducted fan, a starting generator, a cooling fan, a generator and a lubricating oil pipeline; the main engine is arranged at the tail of the aircraft, adopts a large-bypass-ratio turbofan engine, and comprises a fan, a gas compressor, a combustion chamber, a high-pressure turbine, a low-pressure turbine and a spray pipe which are arranged in sequence; a starting generator and a cooling fan are arranged in a front cavity of the main engine, the starting generator is connected to a high-pressure shaft of the main engine, the cooling fan is connected to a low-pressure shaft of the main engine, the cooling fan is located in front of the starting generator, and the starting generator is connected into the main engine and an electric power system of the aircraft. A generator and an inserted lubricating oil pipeline are arranged in a rear cavity of the main engine; the generator is connected to the low-pressure shaft; the two ducted fans are arranged below the two wings, connected with the generator and provided with the hydrogen combustion chamber.

The invention provides an intelligent online interactive ups power supply, and relates to the field of UPS, and the intelligent online interactive ups power supply comprises a processor, an output control circuit, an anti-reverse connection circuit, an ups AC output anti-surge high-voltage protection circuit, an ups power supply starting circuit, a charging circuit, an input detection circuit, a remote control circuit, and a battery assembly. By integrating the anti-reverse-connection circuit, equipment damage or safety accidents possibly caused by reverse connection of the polarity of a power supply are effectively prevented, and the use safety and reliability are improved; through close cooperation and intelligent control of the components, the UPS power supply can provide stable power output when the commercial power is normal, and can be rapidly switched to a battery for power supply when the commercial power is abnormal, thereby ensuring continuous operation of electric equipment, and improving stability and usability of a whole power system.

This utility model discloses a filter bucket with a pull-out water-drawing mechanism, including a bucket body and a bucket lid. The bucket lid has an inlet and an outlet. A filter assembly is installed inside the bucket body. A water pump assembly is installed between the outlet and the filter assembly. A pull-out water-drawing assembly is installed between the inlet and the filter assembly for manually drawing water into the bucket body before the water pump assembly is started. The pull-out water-drawing assembly includes a cylinder. The upper end of the cylinder is connected to the inlet, and the lower end of the cylinder is connected to the filter assembly. A piston is installed inside the cylinder, and a one-way valve structure is installed at the piston. A push-pull rod extending out of the bucket lid is connected to the piston. This utility model has the advantage of being able to conveniently complete the water-drawing operation without disassembly.

The utility model relates to a stage lamp with a lamp holder self-preheating function, which comprises a support frame and a lamp holder pivoted on the support frame, the lamp holder is provided with a light emitting lens and a light source emitting light beams towards the direction of the light emitting lens, the lamp holder is also internally provided with a mounting plate, the mounting plate is provided with a light through hole positioned on the light beam path of the light source; the anti-dazzling screen is movably arranged in the lamp holder; the driving device is in transmission connection with the anti-dazzling screen; the driving device drives the anti-dazzling screen to cut into the light through hole so as to prevent the light source beam from emitting towards the light emitting lens; the driving device drives the anti-dazzling screen to cut out the light through hole so as to allow the light source beam to be emitted towards the direction of the light emitting lens. According to the stage lamp with the lamp holder self-preheating function, the self-preheating function in the lamp holder can be achieved, the driving motor in the lamp holder can be conveniently heated in advance in a low-temperature working environment, light rays are prevented from being emitted from the light emitting lens before the driving motor normally operates, and the lighting effect of the stage lamp is ensured.

The invention relates to a cold-resistant diesel engine fuel oil system which comprises a diesel engine, a main oil tank storing 0 # diesel oil and an auxiliary oil tank storing-35 # diesel oil. A fuel inlet of the cooling liquid heater is communicated with the auxiliary oil tank through an oil supply pipeline, and-35 # diesel oil is used as fuel; the diesel oil heater is arranged in the main oil tank and is used for heating 0 # diesel oil in the main oil tank; two ends of the heat conduction pipe are respectively communicated with a cooling liquid tank outlet and a cooling liquid tank inlet of the diesel engine, and are sequentially connected in series with the cooling liquid heater and the diesel heater; after the cooling liquid absorbs heat, the No.0 diesel oil is heated; -35 # diesel oil is used for supplying oil in the starting stage of the diesel engine; in the conventional stage, 0 # diesel is supplied to a diesel engine. The system only consumes a small amount of high-cost-35 # diesel oil in the starting stage, and uses low-price 0 # diesel oil in the main operation stage, so that the long-term use amount of high-grade diesel oil is greatly reduced, and the fuel oil cost is effectively saved.

A refrigeration system 10 includes a first device 20, a second device 30 communicably connected to the first device 20 via a first cable 60 and a second cable 70, and a refrigerant pipe 50 configured to cause refrigerant circulation to the first device 20 or the second device 30, in which the first device 20 includes a first circuit 231 configured to short-circuit the first cable 60 and the second cable 70 upon detection of abnormality relevant to refrigerant leakage, and the second device 30 includes a second circuit 332 configured to start protection behavior against abnormality when the first cable 60 and the second cable 70 are short-circuited.

The invention discloses a portable hinge type hook platform tool for a cargo oil tank. The portable hinge type hook platform tool comprises a supporting frame, a working platform hinged to the lower end of the supporting frame and a connecting assembly connected between the upper end of the supporting frame and the working platform. The supporting frame is provided with a hook with a locking mechanism, the working platform is provided with a sliding groove in the radial direction of the hinge, and a sliding block connected with the tail end of the connecting piece is arranged in the sliding groove in a sliding fit mode. The working platform is characterized in that the sliding groove is sequentially provided with a driving section, a damping section and a fastening section from the hinged end, a flexible rod penetrating into the sliding groove is arranged on the side portion of the supporting frame, and when the working platform is unfolded from the folded state, the flexible rod rebounds to push the sliding block to slide along the sliding groove; the damping section enables the sliding block to move stably and decelerate, and the fastening section is provided with an automatic locking mechanism which is triggered by the inclined face of the sliding block and composed of a check block and a reset spring. Automatic linkage of the whole process from platform unfolding to sliding block locking is achieved, and the deployment efficiency of local high-altitude operation in the cargo oil tank is improved.