44results about How to "No circulation" patented technology

The invention discloses a switching state control circuit and control method and a fly-back converter. A first voltage sampling signal characterizing the input voltage information is obtained, and theconduction time of a synchronous rectifier tube is adjusted according to the change state of the first voltage sampling signal so as to adjust the absolute value of a negative current flowing througha secondary winding, wherein the negative current is used to discharge a junction capacitor of a main power tube so as to reduce the drain-source voltage of the main power tube. The main power tube can be switched on in a ZVS (Zero Voltage Switching) mode under different input voltages. The magnitude of the negative current is appropriate, and no extra circulating current will be generated. Adaptive control is realized.

The invention relates to an energy-saving and high-efficiency rare earth ore concentrate sulfuric acid stepped roasting method, and belongs to the technical field of wet metallurgy and thermometallurgy. The energy-saving and high-efficiency rare earth ore concentrate sulfuric acid stepped roasting method comprises the following steps: mixing rare earth ore concentrate with sulfuric acid with the mass concentration of more than or equal to 92.5% according to weight ratio of 1 : (1.0-1.3); pelletizing, and charging particles into a first-section roasting kiln to roast, so that fluorine ions and water in the rare earth ore concentrate are completely volatilized; condensing the gasified fluorine ions and water, recovering hydrofluoric acid, roasting defluorinated dry ore particles, and charging the roasted particles into a second-section roasting kiln to separate; washing and absorbing separated sulfuric acid gas during roasting, recovering sulfuric acid, and directly leaching roasted ores to obtain a sulfuric acid rare earth solution. According to the energy-saving and high-efficiency rare earth ore concentrate sulfuric acid stepped roasting method, after the stepped roasting process is utilized, waste gas generated in pelletizing step is water vapor and can be directly discharged; compared with the prior art, the stepped roasting method has the advantages that a waste gas washing and absorbing system is reduced to more than 70% and the environmental protection input is reduced to more than 80%.

The invention discloses a cascaded high-voltage inverter. The high-voltage inverter comprises a phase-shifting transformer, an inverter and a multi-position selector switch assembly, wherein the inverter is connected with the phase-shifting transformer, and the multi-position selector switch assembly is connected with the inverter; each phase of the inverter further comprises two basic converting chains, and each basic converting chain comprises an H bridge power unit and a sharing reactor; a three-phase voltage is input into the phase-shifting transformer, and supplied as power to the H bridge power unit of the inverter after being reduced through the phase-shifting transformer; the H bridge power unit outputs a single-phase alternating voltage through rectification, filtration and inversion; and the serial and parallel connection mode and output mode of each basic converting chain can be changed by changing the on-off state of the multi-position selector switch assembly. According to the cascaded high-voltage inverter, a plurality of H bridge power units are serially connected to form minimum basic converting chains, and the serial and parallel connection combinations and star / triangular conversion of a plurality of basic converting chains are controlled by shifting a multi-position switch, so that full capacity output of various voltage-level converters can be realized, and the inverter is simple in structure and multi-purpose.

The invention provides an electronic scale system supporting two-dimensional code payment. The system mainly comprises a metering module, a two-dimensional code printing module, an information input and setting module, an information display module and a trade information counting module, wherein the metering module realizes a community weighing function; the two-dimensional code printing module comprises a two-dimensional code for realizing the two-dimensional code payment; the information input and setting module realizes setting of information such as a community unit price and a user two-dimensional code payment account; the information display module is used for displaying information such as community weight, price and money; the trade information counting module is used for summarizing trade information to realize printing of trade information such as community money and two-dimensional code payment account information after community weighing during community trade to generate the two-dimensional code; the two-dimensional code is scanned through an intelligent mobile phone to realize a payment function so as to realize paperless money during community trade. A user can also count the trade total money in a certain time period through the trade information counting module and can be used for comparing with the money of the two-dimensional code payment account.

The invention relates to a high-voltage inverter multi-machine parallel shore power supply device and a control method thereof. The device is composed of a man-machine interface (touch screen), a signal modulation board, multiple high-voltage inverters and main control panels thereof, wherein the man-machine interface and the signal modulation board are connected through a serial communication line, the signal modulation board sets voltage and frequency according to the man-machine interface to generate modulated wave data, then the data is transmitted to each high-voltage inverter main control panel through a multichannel single-film optical fiber, the main control panels transmit the data to three-phase multi-level series power units of the corresponding high-voltage inverters through multiple groups of optical fiber communication, and the multiple high-voltage inverters finally output alternating-current high-voltage power with the same phase, frequency and amplitude. Through the control method, all the high-voltage inverters are independent without a subordinate relation and are not limited by communication distance, so that stability and reliability are high, and anti-interference capability is strong.

The embodiment of the invention discloses a parallel operation method for transformers based on a current relay. Circuit breakers are connected between several sections of buses. A transformer is connected between a high-voltage power bus and each section of bus. The transformers have equal rated voltage, approximately same transformation ratio, same connection group mark number, approximately equal short-circuit impedance per-unit value and approximately same short-circuit impedance angle. The error of the transformation ratios of the transformers does not exceed + / -0.5%. The errors of the short-circuit impedance per-unit values and of the short-circuit impedance angles of the transformers do not exceed + / -10%. When the current of a first transformer exceeds 5% of the set value, a circuitbreaker QF2 is changed from a normally open state to a normally closed state, and a second transformer is energized and put into operation. When the current of the first transformer drops to the setvalue, the circuit breaker QF2 is reset, and the second transformer is out of operation. The method of the invention ensures that there is no loop current in the windings during no-load operation of the transformers, ensures that the load distribution is directly proportional to the capacity, improves the reliability of power supply, reduces the reserve capacity, and improves the operation efficiency.

The invention discloses a main power supply storage battery grouping type independent power supply and charging system of an electric ship. Main power supply storage batteries are divided into n groups 1G-nG; the output ends of the storage battery groups are subjected to short circuit protection through fuses and then are connected with respective segmented busbars; the segmented busbars are usedfor mutual backup; each storage battery group is configured with a charger and is provided with n main switches 1Q-nQ; each segmented busbar is connected with the wire inlet end of one main switch; and the wire outlet ends of the main switches 1Q-nQ are connected to a direct-current busbar. According to the system, an existing method for parallel power supply of multiple storage battery groups based on a DC / DC converter is replaced with independent power supply of the grouped main power supply storage batteries of the electric ship, so that the technical problem that the multiple storage battery groups are directly connected in parallel to form a circulating current is solved; and the grouped storage batteries are simultaneously and independently charged, so that the problem that the charging power is excessively high in the prior art is solved, and the technical problem that the charging time is excessively long due to the fact that the multiple storage batteries are charged in sequence is solved.

The invention provides a bidirectional DC-DC topological structure, and a bidirectional DC-DC converter based on the structure. The converter comprises a coupling inductor L, a transformer T and switching tubes Q1, Q2 and Q3, and diodes D1, D2, D3 and D4, wherein the two windings Lc1 and Lc2 of the inductor L have the same turn ratio, the inductance value is Lc, and the two windings of the transformer also have the same turn ratio. The bidirectional DC-DC converter can be applied to a PCU to be used as a BCDR and also can be applied to the fields of all batteries and capacitors and the like which need charging and charging, wherein the converter has four working states: a discharging working state, a state switched from the discharging state to the charging state, a charging working state, and a state switched from the charging state to the discharging state; the numerical models in the forward and reverse directions of the bidirectional topology are both second-order minimum phase systems, so that the bidirectional converter can be subjected to parallel control easily; and the bidirectional converter shares the same coupling inductor in the charging and discharging process, and the second-order minimum phase systems and the shared same coupling inductor act together, so that the bidirectional converter has energy bidirectional high-frequency switching ability.

The invention discloses a soft switch isolation type boost direct current converter and a control method thereof and belongs to the field of power electronic converters. The converter is formed by an input source (Uin), a primary side switching circuit (10), an auxiliary side switching circuit (20), an inductor (Lf), a transformer (T), a first output filtering capacitor (Co1), a second output filtering capacitor (Co2) and a load (Ro). The primary side switching circuit (10) is formed by four switching tubes, and the auxiliary side switching circuit (20) is formed by two diodes and two switching tubes. The converter achieves control of output voltage through phase shifting control of the switching tubes in the primary side switching circuit (10) and the auxiliary side switching circuit (20). The converter has the capability of achieving soft switching of all switching tubes in the whole load range, can achieve high-frequency high-efficiency power conversion, can effectively reduce the size of the inductor and the transformer, achieves high-power density, is simple to control, high in reliability and easy to achieve and provides a key technical scheme for isolation type high-efficiency power conversion.

The invention provides a powdery oil shale retort for heating by using semicoke generated by retorting as fuel. An annular semicoke passage is formed between a rotating inner cylinder and a rotating outer cylinder; a chamber communicated with the annular semicoke passage is formed in a front rotation supporting body, and the chamber is connected with an ignition material inlet; a chamber communicated with the annular semicoke passage is formed in a back rotation supporting body, and a smoke outlet and a slag outlet are formed in the chamber; the front end of a spiral material pusher with a raw material injection opening is connected with the back end of the rotating inner cylinder through a back fixing cylinder and a back sealing mechanism; the front end of the rotating inner cylinder is connected with a front fixing cylinder through a front sealing mechanism; an oil gas outlet is formed in the front fixing cylinder and a semicoke conveying pipe is arranged on the front fixing cylinder; the semicoke conveying pipe is connected with a spiral semicoke feeder; the discharging end of the spiral semicoke feeder is communicated with the annular semicoke passage; a material sealing clearance is formed at the discharging end of the spiral semicoke feeder. The combustion energy of the by product semicoke of retorting is fully used and the discharge amount of the by product is reduced as much as possible.

The invention discloses an energy storage access system used for realizing the energy conversion of a plurality of energy storage batteries and an electric network. The energy storage access system comprises a bidirectional PWM (Pulse-Width Modulation) rectifier, an AC (Alternating Current) LCL (Lower Control Limit) filter circuit connected between the AC side of the bidirectional PWM rectifier and the electric network, a DC (Direct Current) bus, a plurality of bidirectional DC / DC converters connected with the DC side of the bidirectional PWM rectifier through the DC bus and one-to-one correspondent to the energy storage batteries, a plurality of DC LC (Launch Control) filter circuits respectively connected between the bidirectional DC / DC converters and the corresponding energy storage batteries, and a control system used for respectively controlling the bidirectional PWM rectifier and the bidirectional DC / DC converters by outputting a driving signal. The energy storage access system disclosed by the invention drives the energy storage batteries to independently work and dispatches corresponding energy storage batteries according to different control targets to play the characteristics of the current energy storage batteries to the utmost extent so as to realize large scale direct parallel operation of the energy storage batteries.

An odorless closet bowl radically solves the problem of odor given out from the bowl, and the problem of water waste, electricity waste and troublesome operation. The technology cancels the bent pipe water seal of the closest bowl and adopts an automatic valve; when contacting the automatic valve, the fecaluria is automatically discharged out of the closet bowl, so as to eliminate the odor given out during the use of toilet, and at the same time, the devices, instruments and parts such as pressure water tank, electric valve switch machine, water aspirator and base seal of closet bowl are cancelled, so as to realize comfort feeling, no odor during use of toilet, and simple flushing; the invention saves water, electricity, time, material, and investment; furthermore has the function of no return of odor at other times.

The invention discloses a modular multilevel high-power alternating-current / alternating-current converter based on a high-frequency transformer. The converter comprises a first bridge arm, a second bridge arm and a third bridge arm, and each of the first bridge arm, the second bridge arm and the third bridge arm is formed by cascading n sub-modules, wherein each sub-module includes two H-bridge converters, a high-frequency transformer and a cycle converter which are connected in sequence. The converter has a modular design, is easy to expand, and has good output voltage waveform quality, no loop current, high power density and low cost, and has advantages of few bridge arms, a small IGBT total capacity, a small capacitor number and a high direct current voltage minimum harmonic component frequency.

The invention discloses a converter transformer symmetrical pressurization partial discharge test circuit. The circuit comprises a frequency conversion power source, an excitation transformer T1 and an excitation transformer T2 which are of the same structure, a first voltage divider, a second voltage divider, a first compensation reactor branch and a second compensation reactor branch. The high-voltage tail ends of the high-voltage windings of the excitation transformer T1 and the excitation transformer T2, after respectively passing through an ammeter A1 and an ammeter A2, are grounded, and the high-voltage winding output end of the excitation transformer T1 and the high-voltage winding output end of the excitation transformer T2 are respectively connected with the two ends of a valve side winding of a converter transformer; and the first compensation reactor branch comprises a fixed compensation reactor L1 and an adjustable reactor L3 which are connected in series, and the second compensation reactor branch comprises a fixed compensation reactor L2 and an adjustable reactor L4 which are connected in series. According to the invention, through the adjustable reactors, it is ensured that the imbalance of the voltage at the two ends of the valve side winding of the converter transformer and the circulation phenomenon generated when reactive power at the two ends are not consistent when the converter transformer is subjected to a symmetrical pressurization partial discharge test are prevented.

The invention discloses a ventilated cooling device of a digital generating set. The ventilated cooling device comprises an engine side cover, a silencer arranged at the outer side of the engine side cover, a crankshaft, and an impeller arranged on the crankshaft and positioned between the engine side cover and the silencer, wherein one end of the crankshaft extends out of the engine side cover. The ventilated cooling device is characterized in that: a volute air guide device is also arranged between the engine side cover and the silencer, the volute air guide device is provided with a main air inlet and a main air outlet along the axial direction of the crankshaft, meanwhile, a volute cavity is formed in the volute air guide device, and the impeller is positioned in the volute cavity. The volute air guide device is arranged between the engine side cover and the silencer, the volute air guide device is combined with the impeller therein to form a 'turbo charging cooling device' together, and the 'turbo charging cooling device' can eliminate hot air circulation in the digital generating set and enhance the cooling effect.

The invention discloses a stator assembly and a motor with the same. The stator assembly comprises a stator and a stator winding, the stator comprises a stator iron core, and Z coil grooves are distributed in the inner wall of the stator iron core in the circumferential direction; the stator winding comprises three phases of windings, each phase of winding comprises a plurality of branches which are connected in parallel, a coil of each branch of each phase of winding comprises a special-shaped wire and a hairpin coil, the stator winding is formed by inserting the hairpin coil and the special-shaped wire into corresponding coil grooves, and the M layers of coils arranged from the notch to the slot bottom in each coil slot are electrically connected at the non-closed ends of the hairpin coils; and the hairpin coils comprise a first type of hairpin coils with the span of y-1 coil slots and spanning on the same layer, a second type of hairpin coils with the span of y coil slots and spanning on the same layer, and a third type of hairpin coils with the span of y coil slots and spanning on different layers. According to the stator assembly and the motor, the number of welding spots is small, the coil technology is simple, cost is low, and the interlayer coils in the same coil groove are not prone to short circuit.

The supply system based on bus / current collector has the current rail (1) provided with successive energy supply sections (1.1,1.2) which can be coupled together or separated from one another, with a cooperating current take-off (2) used for supplying an energy supply unit onboard a vehicle. Each energy supply section (1.1,1.2) has a current rail end piece (6) mechanically coupled via an insulation piece (4) with a current rail centre piece (5), with briding diodes (7.1,7.2) across the insulation pieces (4) of the adjacent energy supply sections having the same poles facing the separation gap (3) between the latter (6).

A horizontal closestool system is composed of a horizontal closestool, an automatic odour-resistant valve and a horizontal pipeline. According to the horizontal closestool system, elbow water seal in a closestool is omitted, energy is saved by over 50%, emission is reduced by over 50% and the problem of cross-floor water draining in building construction is solved. Due to the fact that the horizontal closestool is adopted, once excrement and urine make contact with the automatic odour-resistant valve, the excrement and the urine are discharged out of the closestool automatically, no excrement or urine is reserved in the closestool, and therefore odour given out by the excrement and the urine is eliminated. Meanwhile, devices such as the water seal elbow, a pressure water tank, an electric pneumatic switch machine, a water aspirator and a closestool base seal and certain procedures are omitted, and therefore the functions that people feel comfortable when using a toilet and cannot smell odour during defecating, flushing is easy, water, electricity, time, materials and investment are saved and 100% odour return prevention is guaranteed are achieved.

The invention relates to a circular current detection method of a duplex-winding double-speed motor. The winding pole pair quantities of the duplex-winding double-speed motor before conversion and after conversion respectively are P1 and P2; and the circulation detection method comprises the following steps of: a, calculating an interval degree b, and calculating the degree value betai corresponding to an ith pole, wherein betai=gamma+i.a, and i=0,1,......,2P2, gamma is an initial value corresponding to a first pole, and betai is the degree corresponding to the ith pole; c, calculating degree differential value thetai of the ith pole, wherein thetai=betai-M*180 degrees-N*360 degrees, M is 1 or 0, N is an integer larger than or equal to 0, and the numerical value of the degree differential value thetai of the ith pole is smaller than or equal to 360; d, drawing the vector values of the 2P2 thetai in an XY plane on the XY plane; and e, calculating to obtain a pole number combination, the vector sum of which is zero, according to the vector values of the 2P2 degree differential value of thetai in the XY plane. Based on that the calculated vector sum of the differential values is zero, the invention can obtain the value of the corresponding pole number combination and ensure that no circular current is generated on the wiring of the duplex-winding double-speed motor with simple algorithm, convenient operation, safety and reliability.

The invention discloses an isolated bridge type three-port DC converter which comprises an inversion unit, an isolation unit, a first output unit and a second output unit, the port at one side of the inversion unit is used for connecting a renewable energy source, the port at the other side of the inversion unit is connected with the isolation unit, the port at one side of the first output unit is connected with the isolation unit, the port at the other side of the first output unit is used for connecting a load, the port at one side of the second output unit is connected with the isolation unit, the port at the other side of the second output unit is used for connecting an energy storage device, the isolation unit is formed by two three-winding transformers, primary-side windings of the two three-winding transformers are connected in series, secondary-side windings of the two three-winding transformers are crossed in a group way and inversely and mutually connected in series, therefore, an output port and the energy storage device share complementary pulse, circulation among the renewable energy source, the energy storage device and the load is eliminated, and energy loss brought by the circulation is reduced.

The invention discloses a dry and wet article separating luggage case, and belongs to the field of travel accessories. The dry and wet article separating luggage case comprises an upper case body anda lower case body, wherein a pull rod is arranged on the upper case body or the overall case body, and a first inner cavity for placing dry articles and a second inner cavity for placing wet articlesare formed in the lower case body; the first inner cavity and the second inner cavity are separated from each other in a sealing way, and the second inner cavity is communicated with the outside through an air inlet and an air outlet; a fan is arranged in the second inner cavity, and a cover plate for covering the second inner cavity is rotationally connected into the lower case body; the cover plate is connected with the second inner cavity in the sealing way. The dry and wet article separating luggage case provided by the invention has the advantage of achieving dry and wet article separation.

The invention relates to a reactor and a coil assembly thereof. The periphery of the iron core is provided with a plurality of insulating columns which are circumferentially arranged. The coil assembly further comprises a first coil and a second coil which are wound on the periphery of the iron core, one end of the first coil and one end of the second coil are mutually connected to form a wire inlet end, the other end of the first coil and the other end of the second coil are mutually independent wire outlet ends, the first coil and the second coil are wound around the insulating columns in anS shape, and the insulating columns are wound by the first coil and the second coil in an S shape. Coils of the coil windings are wound on the insulating columns in a crossed manner (8-shaped winding). The inner coil and the outer coil are sleeved with each other in the prior art, the two coils form a whole body, so that the coils are tightly coupled, the insulation performance between the coilsis improved, the coupling coefficient of the coil assembly can be improved by utilizing the cross winding mode, the voltage loss in a line is reduced, and the requirements of a system with a voltage level of 330KV and above can be further met while the requirements of a medium-high voltage system are met.

The invention provides a water purifier, a stabilized pressure pump and a matching structure of a swash plate assembly and a membrane of the stabilized pressure pump. The matching structure comprises the membrane and the swash plate assembly. The membrane is installed on the end face of the swash plate assembly. The swash plate assembly comprises a plate body, at least two swinging heads arranged on the plate body and a bearing. The bearing is installed in the plate body. The surface of the membrane is parallel to the surfaces of the swinging heads. An included angle exists between the end face of the bearing and the surface of each swinging head. The end face of the membrane is parallel to the end faces of the swinging heads, so that it is guaranteed that the swash plate assembly makes contact with the membrane effectively and reliably, and the situation that sealing of the swash plate assembly fails due to harmful bending deformation generated by the membrane is avoided when the stabilized pressure pump works; stress concentration of the membrane is reduced, and the risk that the membrane is torn in long-term operation is lowered; meanwhile, it can also be guaranteed that three pressurization cavities are separated and no circulating current is generated, and accordingly it is guaranteed that the output water pressure of the stabilized pressure pump is constant and reliable, and the performance of the water purifier is guaranteed.

The supply system based on bus / current collector has the current rail (1) provided with successive energy supply sections (1.1,1.2) which can be coupled together or separated from one another, with a cooperating current take-off (2) used for supplying an energy supply unit onboard a vehicle. Each energy supply section (1.1,1.2) has a current rail end piece (6) mechanically coupled via an insulation piece (4) with a current rail centre piece (5), with briding diodes (7.1,7.2) across the insulation pieces (4) of the adjacent energy supply sections having the same poles facing the separation gap (3) between the latter (6).

The invention is applicable to the technical field of power supplies, and provides a power supply and a power supply system.The power supply comprises a main power supply module, a first bypass module, a second bypass module and a main control module; when the power supply is in a bypass mode and the AC power supply is in a positive half cycle, the first bypass module is unidirectionally conducted, and the AC power supply supplies power to the load through the first bypass module; and when the AC power supply is in a negative half cycle, the second bypass module is unidirectionally conducted, and the AC power supply supplies power to the load through the second bypass module. According to the invention, the two bypass modules which can be conducted unidirectionally are arranged and are respectively used for passing positive and negative alternating current, a plurality of parallel bidirectional bypass modules are not needed, the phenomenon of non-uniform current is avoided, and the performance of the power supply is effectively improved.

The invention provides a bidirectional DC-DC topological structure, and a bidirectional DC-DC converter based on the structure. The converter comprises a coupling inductor L, a transformer T and switching tubes Q1, Q2 and Q3, and diodes D1, D2, D3 and D4, wherein the two windings Lc1 and Lc2 of the inductor L have the same turn ratio, the inductance value is Lc, and the two windings of the transformer also have the same turn ratio. The bidirectional DC-DC converter can be applied to a PCU to be used as a BCDR and also can be applied to the fields of all batteries and capacitors and the like which need charging and charging, wherein the converter has four working states: a discharging working state, a state switched from the discharging state to the charging state, a charging working state, and a state switched from the charging state to the discharging state; the numerical models in the forward and reverse directions of the bidirectional topology are both second-order minimum phase systems, so that the bidirectional converter can be subjected to parallel control easily; and the bidirectional converter shares the same coupling inductor in the charging and discharging process, and the second-order minimum phase systems and the shared same coupling inductor act together, so that the bidirectional converter has energy bidirectional high-frequency switching ability.

The invention belongs to the technical field of transformers, and particularly relates to a variable-flux voltage-regulating rectifier transformer for an electric car. The three-phase coil is of a double-split four-coil structure, the three-phase coil is divided into a valve side coil and a network side coil corresponding to the valve side coil, and the valve side coil is split into three star-connected first valve side coils and three angle-connected second valve side coils. The network-side coil is split into three first network-side coils in corner joint and three second network-side coils in corner joint, and the first network-side coil and the second network-side coil in each phase of coil are connected in parallel; the first network side coil or the second network side coil is provided with a first gear with the number of turns corresponding to the first voltage of the network valve and a second gear with the number of turns corresponding to the second voltage of the network valve. Gear adjustment is convenient and flexible, valve side output voltage interchange can be conveniently achieved, the gear adjusting requirement of the primary side network voltage tapping range can be met, maintenance and management are convenient, structural change is avoided, the position of an external connecting line of a network side coil is not changed, and field operation maintenance and management are convenient.

The invention discloses a LLC sensorless synchronous rectification control method based on phase shift angle feedforward. Using the relationship between the switching frequency and the phase shift angle under synchronous rectification drive and hybrid control when the same set voltage is reached, the precise synchronous rectification is realized through an optimization algorithm, and the phase shift angle feedforward control is introduced to solve the output voltage response The hysteresis of the optimization algorithm leads to the problem of control lag. The control method disclosed in the present invention realizes synchronous rectification without increasing the cost of system hardware, further improves the efficiency of the LLC resonant converter, solves the hysteresis of the optimization algorithm control through the phase shift angle feedforward control, and avoids power supply and load When there is a sudden change, a circulating current is generated on the secondary side of the transformer, which affects the safe operation of the system.