34results about How to "Reduce system efficiency" patented technology

The invention relates to a structure of a carbon dioxide refrigeration device, which is composed of a carbon dioxide compressor, an evaporator, a throttle valve and a condenser. One end is connected to the evaporator, the other end of the evaporator is connected to the air inlet of the carbon dioxide compressor, the evaporator is installed in the cold storage body, and the condenser is installed underground. The invention improves the structure of a common carbon dioxide refrigeration device, can use a single refrigerant carbon dioxide, and has a wide application range, safety and controllability, high efficiency and energy saving carbon dioxide refrigeration device structure.

The invention belongs to the technical field of integrated circuits, in particular relates to a clock frequency selection circuit suitable for a switching power converter. The clock frequency selection circuit comprises two comparators, a finite state machine (FSM) and two multiplexers. The clock frequency selection circuit is applied to a switching power direct-current (DC) / DC converter, and hasthe advantages that the comparators are not required to increase and the encoding of the FSM is modified only so that multiple alternative frequencies can be selected freely, thus reducing the statical power consumption of a system and improving the system efficiency of the switching power converter.

The invention is suitable for the field of integrated circuits and provides a power compensation circuit and a power supply chip of a switching power supply. The power compensation circuit comprises a sampling logic unit, a sampling retaining unit, an operational amplification unit, an energy accumulation unit, a comparator and a clamping unit, wherein the sampling logic unit is used for generating a sampling control signal according to a logic control signal; the sampling retaining unit is used for outputting a sampling processing unit according to the sampling control signal; the operational amplification unit is used for outputting an error amplification signal according to the sampling processing signal and a reference signal; the energy accumulation unit is used for charging and discharging according to the error amplification signal so as to adjust the voltage of the error amplification signal; the comparator is used for comparing a sampling voltage with the adjusted error amplification signal and outputting a compensation control signal so as to compensate peak current of a primary inductor and further compensate power; and the clamping unit is used for clamping the error compensation signal. In the invention, the peak current of the primary inductor is controlled through a negative feedback loop, and the loop gain is increased, thus the sampling time point is precisely optimized, and the output power is compensated on the basis that chip pins are not additionally increased and system efficiency is reduced.

The invention relates to a solar heating heat-accumulating system, comprising a solar thermal collector (1), a heat accumulator (2), a circulating pump (4), heating terminals (5), an expansion pot (6), a heat accumulator inlet valve (7) and a bypass valve (8). The system uses closed cycle; the outlet of the solar thermal collector (1) is connected with the heat accumulator (2) which is connected with the heating terminals (5) in series; the outlets of heating terminals (5) are provided with the circulating pump (4); a bypass is arranged between the solar thermal collector (1) and the heat accumulator (2) and is provided with the bypass valve (8) thereon; the expansion pot (6) is arranged on a pipeline; the structure of the heat accumulator (2) is in the mode of a heat exchanger, and hot water is not directly contacted with heat accumulating materials; the heat accumulator (2) is a square box or a cylindric pot, the box is filled with the heat accumulating materials (3), finned tubes (9) are arranged between the heat accumulating materials (3), and water can flow through the finned tubes (9) to exchange heat with the heat accumulating materials (3).

The invention belongs to the technical field of water treatment and discloses a suspension type distillation device based on a nanomaterial and solar energy. The distillation device comprises an uncovered water tank, a water tank cover, nano cloth and a water collection component, wherein a liquid storage tank is arranged below the uncovered water tank; the water tank cover is arranged on the uncovered water tank; part of the nano cloth is fit with the lower side of the water tank cover; part of the nano cloth is immersed in liquid in the liquid storage tank; the water collection component comprises a condensate tank; the condensate tank is an open hollow structure and is suspended on the liquid in the liquid storage tank; and a capillary structure is arranged on the surface on one side, facing towards the water tank cover, of the condensate tank. The device can achieve heat exchange of steam and water to be evaporated on the basis that a solar energy resource is made full use of; condensate water is absorbed and transported quickly by a capillary action at the same time; the scattering of sunlight by the condensate water is effectively avoided; and a utilization ratio of the solarenergy is further increased on the basis that the efficiency of water purification treatment is significantly improved.

The invention discloses a timer event processing method and device, used for solving the problems of being low in system efficiency and high in power consumption due to frequent Timer events of a system. The method comprises the following steps: determining the expectant expiration time and the maximum allowance delay time of a first timer event, and determining a time interval determined by the expectant expiration time and the maximum allowance delay time; if determining that the timer event, the expiration time of which is within the time interval, exists in an event list, selecting a second timer event, the expiration time of which is within the time interval, in the event list, and setting the expiration time of the first timer event as the expiration time of the second timer event; and adding the first timer event into the event list according to the set expiration time.

The invention discloses a downhole oil-submerged diaphragm pump. An electromotor rotates to drive a conic small gear and a conic large gear to rotate through a coupling and a transmission shaft. A reducing mechanism is formed by the two conic gears. After power is decelerated and converted through the reducing mechanism, an eccentric shaft is driven to drive a connecting rod plunger to do reciprocating motion, and rotating motion of the electromotor is converted into the reciprocating linear motion of the connecting rod plunger; when the connecting rod plunger does up-and-down reciprocating linear motion, hydraulic oil is pushed for pressure increase, and a diaphragm transmits pressure to a working medium of a diaphragm cavity; and a drain valve is opened when the working medium is pressed, the medium is drained, meanwhile, a liquid inlet valve assembly is closed, and suction and drainage of the working medium are achieved in a reciprocating manner in this way. Intelligent, efficient, energy-saving, safe and reliable continuous oil extraction can be achieved in a low-yield well with complex well conditions.

The invention provides a self-excitation-reinforcing high-voltage conversion system of a switch reluctance generator. The system is composed of three conversion branches and an isolation and voltage-down DC / DC converter. The input ends of the three conversion branches are connected in parallel, the output ends of the three conversion branches are connected in series, thus, higher voltage output isobtained, excitation reinforced parts are distributed in all the conversion branches where all phases of windings are located respectively, independent excitation power sources are omitted, the system reliability is improved, and the advantages of a switch reluctance motor are effectively utilized. As input end voltages are far lower than output end series total voltages, voltage withstanding ofinternal devices is low, meanwhile, the switching frequency of all switching tubes is within a low-and-medium frequency range, and losses are low. The system is very suitable for converters of all switch reluctance generators, and especially is oriented to high-voltage loads or grid-connection requirements.

The invention discloses a semi-solid lithium cathode suspension based on nickel-cobalt lithium manganese oxide / carbon nanotube composite material, which is used to improve the contradiction between the conductivity and fluidity of the suspension in a semi-solid lithium ion flow battery, and Improving the electrochemical performance of semi-solid lithium-ion flow batteries. As a high-performance conductive agent, carbon nanotubes are easier to form a conductive network than traditional carbon black conductive agents, but when directly added to the suspension, the viscosity of the suspension will increase significantly, increasing the pump work and reducing the efficiency of the battery system. Combining carbon nanotubes with lithium ion active materials can enhance the conductivity of the suspension while reducing the increase in viscosity, and can bring about many improvements in electrochemical performance.