91results about How to "Little effect of load" patented technology

A method and apparatus for determining a position of an external transceiver (24) relative to an implanted transceiver (23) comprising means (30) for measuring the strength of a magnetic field proximal to thc external transceiver (24) and means for determining a position of the external transceiver (24) relative to the implanted transceiver (23) from said measured magnetic field strength. Furthermore there is disclosed is a method and apparatus for determining a skin flap thickness of a recipient of a prosthesis including a transcutaneous link between the external transceiver (24) and the implanted transceiver (23). A skin-flap thickness meter is also provided.

The invention relates to an energy-saving environmental-protection type abrasion resistant canned hydrocarbon refrigerant, which comprises propane and isobutane. The energy-saving environmentally-protective abrasion resistant canned hydrocarbon refrigerant is characterized in that the energy-saving environmentally-protective abrasion resistant canned hydrocarbon refrigerant further comprises low temperature refrigeration lubricating oil; the propane accounts for 54 to 65 percent; the isobutane accounts for 30 to 40 percent, and the low temperature refrigeration lubricating oil accounts for 3 to 8 percent. The hydrocarbon refrigerant is prepared by mixing mixed alkane with certain proportion and the low-temperature refrigeration lubricating oil in proper amount, thus effectively solving the problem of the prior hydrocarbon refrigerant that a compressor is abraded frequently and a cylinder bore is scuffed frequently due to the characteristics of being too dry and excellent oil solubility, The hydrocarbon refrigerant with mixed alkane disclosed by the invention belongs to natural working fluid, is free of fluorine without influence on warming-up of the global climate. Compared with R12 and R134a, the freezing point is lower; the latent heat of vaporization is larger; the specific energy of constant entropy compression is smaller so that the compressor works more easily. The flowing property is better; the delivery pressure is lower; the load of the compressor is lower; fuel consumption is reduced and the energy-saving rate can reach 10 percent to 20 percent when the air conditioners are running.

A method for applying MIMO technique on TD-SCDMA up-link system includes using two pairs of antennas at emission end of mobile table carrying out space-hour coding on sending data and using multi-pairs of antennas at receiving end of base station to receive space-hour coded data.

The invention discloses an online anti-icing and de-icing device for a wind turbine, comprising an ultrasonic generator (1) and a de-icing unit (2) which is used for generating ultrasonic Lamb waves and horizontal shear waves on the surface of a wind turbine vane (3), wherein the de-icing unit (2) comprises a plurality of piezoelectric transducers (21) arranged on the inner surface of the wind turbine vane (3), and the input end of each piezoelectric transducer (21) is respectively connected with the output end of the ultrasonic generator (1). The invention can realize online anti-icing and de-icing of the wind turbine vane without damaging wind turbine vane materials and has the advantages of low energy consumption, low cost and simple maintenance.

The invention discloses a multi-phase motor winding switching circuit, which belongs to the field of motor control and solves the problem that the energy utilization rate of an existing switching device is low. m head ends of each winding unit of an m-phase motor are connected to m output bus wires of an inverter, each tail end of each winding unit is correspondingly connected with a collector electrode of a switching tube of one switching circuit unit of n winding switching circuit units, emitting electrodes of switching tubes of m switching units of each switching circuit unit are correspondingly connected with a cathode of one diode of one clamping circuit unit after being connected together, an anode of the diode is connected with a power supply direct-current bus wire cathode which drives the inverter of the m-phase motor together, anodes of other m diodes of each clamping circuit unit are correspondingly connected with collector electrodes of the switching tubes of the m switching units of the switching circuit unit together, m diodes are in common cathodes, and anodes of power supply direct-current bus wires are simultaneously connected together. The multi-phase machine winding switching circuit disclosed by the invention is suitable for a motor drive system.

The invention discloses an air purification device. The air purification device comprises an air volume regulation mechanism used for regulating the volume of fresh air entering a box body from a fresh air port and regulating the ratio of the volume of return air entering the box body from an air return port to the total air supply volume according to the indoor gas concentration parameters. The invention further discloses a control method of the air purification device. On the basis of purifying indoor air, the air purification device supplies outdoor fresh air with high oxygen content appropriately according to the indoor oxygen content change, and the influence of loads caused by temperature difference between the indoor air and the outdoor air can be lowered to the maximum degree. The air purification device has the advantages of being safe and convenient to use and saving the energy.

The invention provides a wind generating set. The wind generating set comprises an engine room and a tower barrel, wherein the engine room is mounted at the top of the tower barrel; the engine room is connected with the tower barrel through a yaw bearing; a rotating shaft which is coaxial with the yaw bearing is mounted at the bottom of the engine room; two or more rotor slides which are arranged at intervals and are mutually insulating are arranged on the rotating shaft; each rotor slide correspondingly communicates with one engine room cable; stator slides which are in one-to-one fit with the rotor slides are arranged in the tower barrel; and each stator slide communicates with one tower barrel cable. According to the wind generating set provided by the invention, the engine room cables and the tower barrel cables are connected through slip rings and are adopted as main cables for power transmission, the engine room cables are in the relative static state relative to the engine room, the tower barrel cables are in the static state relative to the tower barrel, the cables are not twisted during the yaw process of the engine room, the technical characteristic requirement of the main cables is reduced, the cables do not need to have high torsion resistance and high abrasion resistance, and cost of the cables is reduced.

The invention provides a whole-house air epidemic prevention energy-saving system. The whole-house air epidemic prevention energy-saving system comprises a shell, wherein an indoor air supply chamber,an air inlet disinfection and filtration assembly, a first power chamber, an air inlet flow dividing system and an air inlet pipe are sequentially arranged on the outer side of the shell from left toright; and an indoor air return pipe, an indoor air return chamber, an air return disinfection assembly, a second power chamber, an air exhaust flow dividing system and an air exhaust pipe are sequentially arranged on the inner side of the shell from left to right. The whole-house air epidemic prevention energy-saving system provided by the invention has the advantages that fresh air can be introduced to keep comfort, viruses and bacteria are diluted by increasing the fresh air exchange amount, the air flow organization form of an indoor room is changed to prevent virus expansion, the air return disinfection assembly is arranged to sterilize and disinfect breathed air, the air inlet disinfection and filtration assembly is arranged to sterilize and filter outdoor introduced fresh air, therequirement for epidemic prevention is met, and the situations of cross infection, secondary infection and the like of air viruses are avoided. In addition, the air treatment system has higher energyconsumption efficiency.

The invention relates to an oil recovery method of closed circulation and viscosity breakback of hot oil in a viscous oil well and a device; the method comprises the following steps of: putting the crude oil into a heating system of a special device, adopting two sets of systems with burning of coal or gas or a single system with burning of coal or gas, being capable of adopting one well with one system or a plurality of wells with one system, and heating and injecting the crude oil into the well for closed circulation. The device comprises a heating system, a buffering tank, an injecting circulating system and an oil pumping system; the circulating system comprises a telescoped central pipe and a telescoped outer sleeve; the telescoped central pipe is sleeved into the telescoped outer pipe, an opening of the lower end thereof is a free end and the upper end thereof is connected with a circulating valve, an injecting pipe, a surface flow pipe, a boosting pump, the buffering tank and the outlet of the heating system in sequence; the lower end of the telescoped outer pipe is connected with the oil-well pump and the upper end thereof is connected with a polished rod, a drain pipe and the inlet of a heating system in sequence by a polished rod sealer; and the upper end of the circulating valve is connected with a polished rod eye of an oil pumping unit. The invention has the characteristics of good heat exchange performance, good viscosity breakback, high pump efficiency, and the like and is widely applied in viscous oil recovery technology.

The invention provides a circuit for detecting wide-range, high-precision and multichannel currents based on optical couplings. The circuit comprises a current sampling circuit, an analog selection circuit, an analog optical coupling circuit which are connected successively, a secondary differential amplification circuit, an impedance conversion circuit, an effective value conversion circuit and a data processing unit. The current sampling circuit is connected in series in a load by using a low resistance wire wound resistor to send a plurality of channels of low voltage signals to the analog selection circuit, and the analog selection circuit completes more choose one in time division; the analog optical coupling circuit separates a voltage signal portion and a data processing portion on left and right sides; the effective value conversion circuit converts alternating current voltage signals into direct current voltage signals; and the data processing unit samples and calculates the direct current signals to obtain actual current values. The circuit for detecting wide-range, high-precision and multichannel currents based on optical couplings has the advantages that the sampling reliability is high, loaded effects are few, multichannel integration is facilitated, and the cost is low; the system disturbance resisting capability is high; the sampling accuracy is high, and the range is wide; and small signal processing distortion is small. The whole system circuit is simple and easy to implement.

A flight attitude adjustment and control system for an oil-drive multi-rotor agricultural plant protection helicopter comprises a helicopter rack. At least three liquid containers are arranged on the periphery of the rack in different directions. Liquid is contained in the liquid containers. The helicopter is provided with a liquid conveying pump. Each liquid container is internally provided with a liquid suction pipe and a liquid inflow pipe. The liquid inflow pipes are connected with an outlet of the liquid conveying pump. Liquid outflow pipes are connected to an inlet of the liquid conveying pump. Each liquid suction pipe and each liquid inflow pipe are each provided with an electronic control valve. Each electronic control valve and the liquid conveying pump are connected to a control system. When the flight attitude needs to be adjusted, the control system sends out a command to make the liquid conveying pump work, and the liquid is switched in the liquid containers in the different directions, so that the gravity center of the helicopter is changed, and the required flight attitude is obtained by the helicopter through the change of the gravity center. The flight attitude adjustment and control system is simple and easy to achieve.

The invention relates to a control circuit of an electric tool, which comprises a central control module, a motor drive module, a motor and a working parameter detection module. The working parameter detection module is electrically connected with the motor and the central control module. The working parameter detection module returns parameters detected during the operation of the motor to the central control module. The motor drive module is electrically connected with the motor by means of a first switch module and a second switch module respectively. The motor drive module controls intermittent on/off of the first switch module and the second switch module. The on/off state of the first switch module and the on/off state of the second switch module are always opposite. That is to say, when the first switch module is switched on, the second switch module is switched off; and when the first switch module is switched off, the second switch module is switched on. By means of the control circuit, the inductive impedance of the motor is well reduced, the speed of the motor is smoother, the influence of the load on the speed of the motor is smaller, and the run-out phenomenon of an electric chain saw is greatly reduced.

The utility model relates to an offshore wind power single pile foundation hugging and centralizing device with rolling compensation type, which belongs to the technical field of offshore engineeringinstallation and is an auxiliary equipment on a ship. The device mainly comprises a tight ring structure, a swing frame structure, a fixed frame and a roll compensating hydraulic cylinder, and is mainly used for overcoming the influence of the rolling motion of the floating body when piling the floating wind power installation platform, and for tightening the single pile foundation of the wind power, guiding the falling point and controlling the verticality of the single pile foundation. In the past, the single-pile wind turbine foundation was installed on a fixed installation platform, whichwas fixed on the seabed with pile legs, and was little affected by the environmental load, but limited by the depth of the piling water. Floating mounting platform overcomes the limitation of mountingwater depth, but the stability of floating platform itself is low, which makes the accuracy of mounting point and verticality decrease. The invention overcomes the rolling motion of the floating bodythrough rolling compensation, adjusts the position of the pile body through a hydraulic actuator, and improves the installation precision of the floating installation.

The invention discloses a united power-increasing structure and method for a wind driven generator set. The structure simultaneously adopts two or three of three power-increasing accessories of a spoiler, a vortex generator and a Gurney flap to increase the power for the wind generating set. The united method includes the steps of firstly, conducting an optimized design on the sizes of the three power-increasing accessories according to the geometric profile of a blade body; after determining the sizes of the three, combining the characteristics of the actual wind conditions of a wind field with the operation conditions of a wind driven generator, adopting the way of a united design to optimize all the layouts of the power-increasing accessories. By means of the united method, the disadvantages of using only one power-increasing accessory can be eliminated or reduced, moreover, the aerodynamic performance of wind wheel blades can be improved to the maximum, and then the generating capacity of the set can be increased. By using the power-increasing accessories to increase the generating capacity, the load of the set is less affected, and the efficiency of increasing the power for the conditions of low air density, low wind speed area, and the mismatch between wind speed and wind wheel revolving speed is remarkable.

The invention relates to a lightweight U-shaped steel beam structure which belongs to the technical field of steel structure building members. The adopted technical scheme is as follows: U-shaped steel beam lateral plate edges are symmetrically arranged in the two side directions of a U-shaped steel beam baseplate; punching a row of equilateral triangle-shaped through holes at the middle of each U-shaped steel beam lateral plate edge; and the equilateral triangle-shaped through holes are in positive-reverse arrangement alternately, a hem which is folded to the same side is arranged at a mouth part of each equilateral triangle-shaped through hole, and a long strip-shaped convex rib which is opposite to the direction of the hem is punched between every two equilateral triangle-shaped through holes. The U-shaped steel beam structure can not only reduce the weight of a steel beam, but also increase the loading capacity of the steel beam, be conductive to safety of a building and reduce the construction cost of the building.