40results about How to "Achieve buck" patented technology

The invention provides a refrigeration anti-freezing protection control method and device for an air conditioner and the air conditioner. The control method comprises the following steps that after the air conditioner is started and is subjected to refrigeration operation, the temperature of an inner disk is acquired; whether the condition of entering an anti-freezing protection mode is met or notis judged according to the temperature of the inner disc; and if the condition of entering the anti-freezing protection mode is met, the air conditioner enters the anti-freezing protection mode, andthe operation state of an inner fan, a bypass control valve and a compressor is controlled according to the temperature of the inner disk, the exhaust temperature of the compressor of the air conditioner and a current wind gear of the inner fan of the air conditioner after the air conditioner enters the anti-freezing protection mode so as to prevent an indoor heat exchanger from freezing, whereinthe bypass control valve is arranged between the indoor heat exchanger and an outdoor heat exchanger. According to the refrigeration anti-freezing protection control method for the air conditioner, the evaporation temperature is improved through the adjustment of the air conditioner so as to achieve the defrosting purpose of an inner machine, frequent restart of the compressor is avoided, the pressure reduction and defrosting effects of the air conditioner are achieved.

The invention discloses a bidirectional energy storage converter, and relates to the technical field of power transmission and transformation. The bidirectional energy storage converter comprises a plurality of DC boost-buck units, a three-phase inversion bridge circuit, a controller, an adaptor, an AC filtering circuit, an isolation transformer and an AC EMI filter, wherein the AC EMI filter is connected with an AC bus, the AC bus is connected with a power grid by an AC circuit breaker, a high-voltage end of the isolation transformer is connected with the AC EMI filter, a low-voltage end of the isolation transformer is connected with an AC output end of the three-phase bridge inverter and an AC input end of the adaptor, a DC input end of the three-phase bridge inverter is connected with the DC boost-buck units, and a sampling signal input end of the controller is connected with a DC input end/AC output end of the three-phase bridge inverter and a DC output end/AC input end of the adaptor. By the bidirectional energy storage converter, bidirectional energy flowing of the AC system and the DC system can be achieved, multi-path DC inputs of multiple paths of different types of DC power supplies also can be achieved, peak clipping and valley filling of a power grid load can be achieved, and the bidirectional energy storage converter also has the functions of emergency power supply, reactive power compensation, electric energy quality control and the like.

An arrangement is provided a converter, an inverter, a smoothing condenser connected between the converter and the inverter, and reactors each connected between the connection point of each pair of IGBT switches of the converter and the output terminal of each phase of the AC power source. The converter has three pairs of IGBT switches for three phases that are serially connected to one another and connected in parallel to one another. First diodes are each connected in reversed polarity and in parallel to each IGBT switch. The inverter has three pairs of IGBT switches that are serially connected to one another and connected in parallel to one another. Each diode is connected in reversed polarity and in parallel to each IGBT switch.

The invention provides a safe combustible ice mining system and method in a seabed shallow layer. The safe combustible ice mining method comprises the following steps that a pre-development section isdetermined; the development program of combustible ice is developed; a row of 5-6 horizontal well sets are distributed; drilling is performed in the positions of the horizontal well sets; slotting treatment is performed around a shaft after drilling; pulling out of hole of a drill is performed; the completion fluid in the shaft is replaced; vapour with temperature being 120DEG C-180DEG C and pressure being 20MPa-30MPa is injected into separated wells in the 5-6 horizontal well sets; the water mist in the ejected gas is observed; ignition is performed; and the wellhead gas is incorporated intoa gas outlet pipeline. According to the features such as seabed topography and geomorphology, engineering geological characteristics, and a combustible ice reservoir in the hydrate area, the environmental problems and disasters caused by methane leakage are avoided from engineering through reasonable well location layout and pressure lowering schemes.

The invention discloses a low-voltage intelligent voltage-regulating and voltage-stabilizing system. The low-voltage intelligent voltage-regulating and voltage-stabilizing system comprises a single-phase intelligent voltage regulator. The low-voltage intelligent voltage-regulating and voltage-stabilizing system is characterized in that the single-phase intelligent voltage regulator comprises an intelligent control switching unit, a power capacitor and a single-tap isolation transformer, the intelligent control switching unit comprises a main control MCU, a single phase alternating current voltage and current acquisition module, a switch action unit and a wireless communication module; the single phase alternating current voltage and current acquisition module, the wireless communication module, a power module and the switch action unit are respectively connected with the main control MCU; the switch action unit is formed by assembling one single-pole double-throw interlocking alternating current contactor, one single-pole single-throw common type alternating current contactor, relays and spare relays, and each relay is connected with one spare relay in series and then is connected with one single-pole double-throw interlocking alternating current contactor and one single-pole single-throw common type alternating current contactor in parallel; and the wireless communication module comprises a GPRS wireless communication module and a WIFI wireless communication module. The low-voltage intelligent voltage-regulating and voltage-stabilizing system can realize automatic holding of stable output voltage of a user side.

The invention provides a four-switch MPPT (Maximum Power Point Tracking) controller. The four-switch MPPT controller comprises a photovoltaic power supply, a photovoltaic anti-reverse protection unit,a four-switch Buck-Boost conversion unit, a battery reverse connection protection unit and a load control protection unit connected in order; the battery reverse connection protection unit is connected with a storage battery, and the load control protection unit is connected with the battery reverse connection protection unit and the load; the photovoltaic anti-reverse protection unit is used toavoid damaging of the solar controller caused by reverse connection of the photovoltaic power supply; the four-switch Buck-Boost conversion unit is configured to achieve buck and boost of the controller; the battery reverse connection protection unit is used to avoid damaging of the solar controller caused by reverse connection of the storage battery; and the load control protection unit is configured to avoid damaging of the solar controller caused by too large load, reverse connection and short circuit. The four-switch MPPT controller has a buck-boost function, is low in power device voltagestress and few in reactive elements, has the input and output like polarity and common ground, and is suitable for occasions in a wide input voltage range.

The invention discloses a desorption flow fault detecting device and method for a vehicle evaporative emission system and a vehicle. The device comprises an ECU, a pressure sensor, a flow restrictionorifice, a switching valve, a first vacuum pipeline, a second vacuum pipeline and a third vacuum pipeline. The diameter of the flow restriction orifice is smaller than an inner diameter of the secondvacuum pipeline, one end of the first vacuum pipeline is in communication with the atmosphere, the other end of the first vacuum pipeline is connected to a first end of the switching valve, the flow restriction orifice is disposed on the first vacuum pipeline, one end of the second vacuum pipeline is in communication with the atmosphere, the other end of the second vacuum pipeline is connected toa second end of the switching valve, one end of the third vacuum pipeline is connected to a third end of the switching valve, and the other end of the third vacuum pipeline communicates with an atmospheric communication port of an activated carbon canister of the vehicle or is connected to an air inlet of a desorption control valve of the vehicle, and the pressure sensor is set on the third vacuumpipeline. According to the device, the accuracy of detecting a desorption flow fault of the vehicle evaporative emission system is improved.

The invention provides a tool for reducing the equivalent circulating density. The tool comprises an outer cylinder, a one-way check valve assembly, an inner shell and a piston rod, wherein the outercylinder is put in a borehole, and a first annulus is formed between the outer cylinder and the borehole; the outer cylinder is sleeved with a sealing mechanism sealed on the inner wall of the borehole, and the first annulus is separated into an upper annulus and a lower annulus; the sidewall close to the upper end of the outer cylinder is provided with jet holes communicating with the upper annulus, and the sidewall close to the lower end of the outer cylinder is provided with inflow holes communicating with the lower annulus; the one-way check valve assembly is arranged in the outer cylinder, the inner shell is connected with the lower end of the one-way check valve assembly , and a second annulus is formed between the inner shell and the outer cylinder; the sidewall of the inner shell is provided with pressure relief holes, and the bottom wall of the inner shell is provided with a through hole; the piston rod is arranged in the inner shell, the lower end of the piston rod is arranged in the through hole in a penetrating manner, and a piston is arranged at the upper end of the piston rod; and a first flow channel is arranged in the piston, and a second flow channel communicatingwith the first flow channel in a butt joint manner is arranged in the piston rod. The tool for reducing the equivalent circulating density can reduce the equivalent circulating density, realizes the purpose of depressurization and guarantees safe and efficient well drilling.

The present invention discloses a pressure-decreasing flow-increasing type switch hydraulic source with oil-returning backpressure, which is characterized by that the high-speed switch valve and liquid inductance element are series-connected on the hydraulic main line oil supply pipeline, the backpressure valve is connected on the hydraulic main line oil-returning pipeline, the non-return valve and liquid volume element are respectively cross-connected between the hydraulic main line oil supply pipeline and oil-returning pipeline, the output end of the non-return valve is connected with output end of high-speed switch valve and input end of liquid inductance element, and the input end of liquid volume element is connected with output end of liquid inductance element, and the output end ofnon-return valve and output end of liquid volume element are connected with input end of backpressure valve.

The invention discloses a storage safety device for volatile liquid, and relates to the technical field of volatile liquid storage. The device comprises a tank body, a base and a fixed seat; a condensation recovery chamber is arranged in the base; a pressure relief chamber is arranged in the fixed seat; a third through hole and a fourth through hole are respectively formed in the bottom of the pressure relief chamber; a peripheral side surface of the third through hole is fixedly connected with a pressure relief pipe; a plurality of breather pipes are mounted close to the top of the peripheralside of the tank body; one end of each breather pipe penetrates through the peripheral side of the pressure relief pipe; a third spring is mounted at one end, away from the tank body, in the breatherpipe; and one end of the third spring is fixedly connected with a sliding block. Through the design of the third spring, the sliding block, the pressure relief pipe and the pressure relief chamber, automatic pressure control can be achieved, the structure is simple, and safety is high; through the design of a refrigeration control box, a spiral condensation pipe and the condensation recovery chamber, gas liquefaction can be achieved, the temperature in a spiral condensation pipe is reduced, the tank body is effectively cooled, liquid volatilization is reduced, and the safety is high.

The invention discloses a three-phase isolation AC-DC converter. The three-phase isolation AC-DC converter comprises a primary side, a secondary side and a resonant network, upper and lower bridge arms of each phase of a primary side adopt a group of common-source anti-series switching tubes with the same structure, a resonance network adopts an LLC series resonance structure, and a secondary siderectification side adopts a rectification circuit. The power device of the primary side circuit of the topology can realize zero-voltage soft switching (ZVS) and can realize a power factor correctiontechnology (PFC) function at the same time. According to the converter, the power factor correction technology and the resonance soft switching technology are combined, so that the input current of the converter changes well along with the input voltage, and the PFC function is realized; the converter realizes stable direct-current voltage output by controlling output voltage; and meanwhile, theconverter is provided with a high-frequency transformer, so that an electrical isolation function can be realized.

The valve control device with the remote monitoring function comprises a valve body, a feeding pipe and a discharging pipe are connected to the valve body, a pressure sensor is installed in the feeding pipe, a box body is installed on the valve body through a supporting rod, a flow control assembly is arranged on the box body, a working cavity is formed in the box body, and a valve rod is installed in the working cavity. A piston is slidably installed in the working cavity, a piston rod is installed on the piston, a sliding hole is formed in the bottom of the box body, the piston rod penetrates through the sliding hole, a valve element is arranged in a valve cavity of the valve body, a valve hole is formed in the valve cavity, and a valve rod is installed on the valve element. When the valve is opened, materials in the feeding pipe can be extruded, so that the materials can generate acting force on the pressure sensor, the pressure sensor feeds back data of the condition in the feeding pipe to a remote terminal, remote monitoring of the condition of the valve is achieved, and at the moment, the remote terminal can achieve automatic adjustment of the valve through the flow control assembly.

The invention relates to a parallel type advection plunger pump, which comprises a drive transmission module (1), a cylinder body plunger module (2) and a complete machine support (3). The parallel type advection plunger pump provided by the invention can be used for accurately and quantitatively conveying a required liquid, and a liquid flow is not influenced by backward-stage pressure fluctuation, so that the liquid is ensured to be output continuously and stably. The device provided by the invention is mainly used in a water purification system in an environmental control and life support subsystem in a space station, provides current-rated water to be treated to a purifier, can ensure the output accuracy to be unaffected when the pressure in the purifier is changed, and has the characteristics of accuracy in supplying, capability of being unaffected by backward-stage pressure, high output efficiency and output continuousness. The device provided by the invention adopts a novel series seal structure, so that the product processing difficulty is reduced, the product accuracy is ensured, the requirements on sealing reliability and long service life of the plunger pump are met, thereliable operation of a water purification system is ensured, and a special working condition demand can be met.

The invention discloses a sealing assembly for a rotary machine. The rotary machine comprises a stator and a rotor. The sealing assembly comprises a brush type sealing part, a honeycomb sealing part and a fingertip sealing part, the brush type sealing part, the honeycomb sealing part and the fingertip sealing part are suitable for being arranged on the stator, the brush type sealing part and the fingertip sealing part are arranged alternately in the axial direction of the rotor, the honeycomb sealing part is arranged between the brush type sealing part and the fingertip sealing part and is opposite to sealing teeth arranged on the surface of the rotor, and the honeycomb sealing part and the sealing teeth form labyrinth seal. The sealing assembly for the rotary machine has the advantages that the sealing effect is good, in addition, the service life is long, the required sealing space is small, and the applicability is improved.

The invention relates to an oil measuring indicator for a hydraulic pipeline and a detecting method of the indicator, belonging to the field of mechanical testing. The large cavity end of a cylinder body is in threaded connection with a sealing cylinder head which is in threaded connection with a liquid filling device, and a small cavity oil replenishing device is in threaded connection with the small cavity end of the cylinder body; the T-shaped inner end of a piston of a T-shaped moving steel rod system is slidably connected with the inner part of the cylinder body, while the outer end is located outside the cylinder body; one end of the moving steel rod system is located in a seat on the sealing cylinder head, and the other end of the moving steel rod system is located in piston of theT-shaped moving steel rod system; the two ends of an indicating pipeline are respectively connected with connecting holes in the large cavity and the small cavity of the cylinder body in a sealing manner, and the indicating pipeline is filled with an indicating medium; an annular piezoelectric ceramic is fixedly connected with a pressure signal conversion piston and an opening of the indicating pipeline. The oil measuring indicator for the hydraulic pipeline and the detecting method of the indicator have the advantages of novel structure, high practicability and wide application range, provideconvenience for maintenance of various hydraulic pipelines, save manpower and material resources, and can greatly improve work efficiency in actual production and application.

The invention discloses a motor matrix cascade control circuit, which comprises a power supply circuit and a controller circuit, and is characterized in that the power supply circuit is connected with the controller circuit; the power supply circuit comprises a working power supply input interface, a system power supply load switch, a motor power supply load switch, a sensor power supply load switch, a CAN transceiver power supply load switch, a first voltage stabilizing circuit, a second voltage stabilizing circuit and a third voltage stabilizing circuit. The controller circuit comprises a main controller, a sensor interface circuit, an isolation CAN transmit-receive interface circuit and a motor interface circuit. According to the invention, the highly integrated motor matrix cascade control circuit is arranged, so that the flexibility of the controller circuit capable of being matched with peripheral equipment is high, and power supply load switches are allocated to each power supply, so that the circuit is isolated, and the working stability of the system is improved.