16results about How to "Extended operating range" patented technology

The invention provides a control method and system for inter-phase charge state balance of a high-voltage direct-hanging energy storage system. The method comprises the following steps: receiving an active power instruction and a reactive power instruction of the system; measuring the charge state of each battery unit by the system; measuring by the system to obtain a power grid voltage effective value and a power grid current instantaneous value; calculating a power factor of the system according to the active power instruction and the reactive power instruction; calculating active power reference of each phase according to the active power instruction, the reactive power instruction and the charge state of each battery unit; according to the active power instruction, the reactive power instruction, the power grid voltage effective value, the power grid current instantaneous value, the power factor and the active power reference of each phase, calculating to obtain a zero-sequence voltage of the injected three-phase modulation signal; and calculating a three-phase modulation signal after zero-sequence voltage injection according to the zero-sequence voltage. According to the method, the convenience of a control algorithm can be improved, the operation range of inter-phase charge state balance is expanded, and the control efficiency of inter-phase charge state balance is improved.

The utility model provides a diffuser and a compressor. The diffuser includes: a first diffuser portion including a first stationary diffuser body portion; the second diffuser part is arranged opposite to the first diffuser part, forms a diffusion flow channel and comprises a movable diffuser body part; and the driving part is in driving connection with the movable diffuser body part and is configured to drive the movable diffuser body part to move relative to the first static diffuser body part so as to change the minimum through-flow area of the diffusion flow channel. According to the diffuser provided by the invention, the internal gas flowing condition of the compressor where the diffuser is located under the small load condition can be improved, so that the compressor can normally operate under the small load condition, and the operation range of the compressor is widened.

The invention relates to a mechanical sealing structure for a shaft end of a compressor and a sealing, lubricating and cooling method. The compressor is characterized in that the compressor comprises a movable ring, a static ring and a lip-shaped sealing ring, an oil storage cavity and an oil supply ring cavity are formed in a compressor shell, the oil storage cavity and a rotor cavity are separated through a separation convex ring, and the lip-shaped sealing ring is installed between the separation convex ring and a compressor rotor; the movable ring and the static ring are both located in the oil storage cavity, the movable ring is fixed to a compressor rotor, the static ring is fixed to a compressor shell, a sealing convex ring on the movable ring abuts against a sealing plane of the static ring to form a mechanical sealing face, an inlet of the oil supply ring cavity is connected with an external high-pressure oil supply pipe, and a plurality of oil spraying openings are formed in the wall face between the oil supply ring cavity and the oil storage cavity. And the oil injection port is obliquely arranged and is aligned with the mechanical sealing surface. The sealing device is reasonable in structural design and good in sealing, lubricating and cooling effects.

The present application relates to a gas diffusion layer and a preparation method thereof, and belongs to the field of fuel cell technology; the gas diffusion layer comprises carbon fiber, a conductive agent and a hydrophobic agent, the carbon fiber is distributed in a porous skeleton to form a carbon fiber skeleton, and the conductive agent and the hydrophobic agent are attached to the carbon fiber skeleton; the gas diffusion layer takes carbon fiber as a substrate, and adds a conductive agent and a hydrophobic agent, so that the conductivity and drainage performance of the GDL are more excellent, and it has stronger mechanical properties. Compared with the traditional GDL, it does not have a GDB layer and an MPL layer, which makes it thinner, and the internal resistance of the body and the internal resistance between it and the CCM are both smaller. When applied to a membrane electrode, the gas distribution during the operation of the membrane electrode is more reasonable, which broadens the operating range of the membrane electrode, and thus can take into account the performance of the membrane electrode at high humidity and low humidity.

The invention provides an air supplementing and enthalpy increasing assembly, a pump body assembly, a compressor and refrigeration equipment, the air supplementing and enthalpy increasing assembly comprises a base, a first sliding block, a second sliding block, a first elastic reset piece and a second elastic reset piece, a first sliding groove and a second sliding groove are formed in the base, and a first compression cavity communicating port and a first air supplementing communicating port are formed in the groove wall of the first sliding groove; a second compression cavity communication port and a second air supply communication port are formed in the wall of the second sliding groove, in the first state, the first sliding block is located at the first disconnection position, the first compression cavity communication port and the first air supply communication port are not communicated, the second sliding block is located at the second communication position, and the second compression cavity communication port and the second air supply communication port are communicated; and in the second state, the first sliding block is located at the first communicating position, the first compression cavity communicating opening communicates with the first air supply communicating opening, the second sliding block is located at the second disconnecting position, and the second compression cavity communicating opening does not communicate with the second air supply communicating opening. The air supply enthalpy increasing assembly can control the low-pressure cavity to be connected with the air supply channel, so that injection air supply to the compression cavity with small pressure is achieved, and air backflow can be effectively prevented.

The invention relates to a miniature turbine power generation system suitable for high altitude and low oxygen content. The miniature turbine power generation system comprises an oxygen generation system, a gas compressor, a heat regenerator, a combustion chamber, a turbine and a power generator. The oxygen generation system separates oxygen-enriched gas from outside air, after the oxygen-enriched gas enters the shell, the oxygen-enriched gas is pressurized through the compressor, the pressure in the shell is increased, a bearing, a main shaft and a motor are cooled, and then the oxygen-enriched gas enters the compressor impeller to be compressed to form high-pressure oxygen-enriched gas; the heat regenerator is connected with high-pressure oxygen-enriched gas at an outlet of the gas compressor and tail gas at an outlet of the turbine, the high-pressure oxygen-enriched gas is heated through tail gas waste heat and then enters the combustion chamber, and high-temperature and high-pressure gas formed after combustion in the combustion chamber enters the turbine and then acts to generate electricity outwards. The problems that a miniature turbine power generation system is difficult to ignite, poor in operation stability and low in power generation efficiency under the high-altitude low-oxygen-content environment are solved, and the system has the advantages of being wide in operation range, stable in low-voltage ignition, reliable in operation, high in power generation efficiency and the like.

The application discloses a kind of power station dynamic adjustable axial flow fan hybrid blade design method, comprising: first, according to the fan energy-saving reconstruction technical route of fan selection parameter before and after adjustable blade axial flow fan energy-saving reconstruction;Then, according to the fan energy-saving reconstruction technical route, adjustable blade axial flow fan hybrid blade design method is given;Finally, based on the arrangement mode and installation method of the fan hybrid blade on the hub of the designed fan hybrid blade.The application can be customized according to the actual needs of users, personalized development of adjustable axial flow fan small energy-saving blade, and the developed small energy-saving blade is mixed with the original blade and used, and the output of the fan can be reduced after the design of the hybrid blade of the adjustable axial flow fan, realizing the deep energy saving of the fan.

The invention relates to the technical field of packaging carton processing, in particular to a linkage type processing device applied to packaging cartons, which comprises a horizontal rack, and a main electric control conveying belt and auxiliary electric control conveying belts positioned on two sides of the main electric control conveying belt are movably assembled on the central section of the upper surface of the horizontal rack. According to the linkage type machining device applied to the packaging carton, the main electric control conveying belt is movably assembled on the central section of the upper surface of the horizontal rack, the auxiliary electric control conveying belts are arranged on the two sides of the main electric control conveying belt, the bottom supporting area can be freely adjusted according to the specification size of a paperboard, and the adaptability is improved; an electric control type lifting adjusting frame is movably assembled in a top cross beam at the upper end of the horizontal rack, fixing and separating can be automatically controlled according to the position of a bottom paperboard, and the machining stability is improved; an electric control translation guide rail, an inner side pressing wheel, an electric control type external cutting hob and an electric control type lifting pressing rod are assembled in the electric control type lifting adjusting frame, and the function integration degree is greatly improved.

The application provides a compressed air energy storage system and method, and relates to the technical field of energy storage.The compressed air energy storage system comprises a compression device, a multistage gas storage device and a multistage expansion device.The multistage gas storage device comprises a main gas storage device and a plurality of sub gas storage devices.The gas inlet of the main gas storage device is communicated with the gas outlet of the compression device.The first gas outlet of the main gas storage device is respectively communicated with the gas inlets of the sub gas storage devices.The multistage expansion device comprises a plurality of sub expansion machines connected in series.The gas inlet of the multistage expansion device is communicated with the second gas outlet of the main gas storage device.The gas inlet of each sub expansion machine is communicated with the gas outlet of the corresponding sub gas storage device.The compressed air energy storage system has a wide adjustable operation range when releasing energy, and the operation boundary of the system is expanded.

The utility model discloses a high-precision hydraulic adjusting mechanism for an engineering land leveler, which relates to the technical field of engineering land levelers and comprises a slicking cutter, a rotating seat is fixedly connected to the upper portion of the slicking cutter, a connecting frame is rotatably connected to the upper portion of the rotating seat, a mounting seat is fixedly connected to the lower portion of the connecting frame, and the mounting seat is fixedly connected to the lower portion of the slicking cutter. A hydraulic cylinder is rotatably connected to the mounting seat, a connecting seat is fixedly connected to the output end of the hydraulic cylinder, a driving seat is rotatably connected to the connecting seat, the driving seat is fixedly connected with the rear part of the slicking cutter, an adjusting assembly is arranged at the upper part of the connecting frame, and the adjusting assembly comprises an adjusting frame. Through the arranged adjusting assembly, the position of the slicking cutter can be changed in a transverse moving mode, so that the slicking operation can be conducted in an offset mode, the operable range is enlarged, and using is more flexible and convenient. And the hydraulic cylinder can change the state of the slicking cutter, so that the slicking device is suitable for different slicking angles, and is convenient to use.

This invention relates to the field of centrifugal compressor technology, specifically disclosing a supercritical carbon dioxide centrifugal compressor and its aerodynamic design method. The centrifugal compressor includes a centrifugal impeller; on the circumferential direction of the impeller disk, multiple main blades and multiple branch blades are arranged in an alternating structure, and the inlet portion of each branch blade is recessed and offset from the inlet portion of each main blade along the axial direction of the impeller disk. This invention, through optimized design of the centrifugal impeller, effectively avoids condensation at the inlet of the centrifugal compressor under near-critical conditions for S-CO2, which is beneficial for improving compressor efficiency, widening the operating range, and allowing for the selection of inlet parameters that are closer to the critical point. This, in turn, effectively improves the cycle efficiency of the S-CO2 power generation system, possessing significant engineering importance and broad application prospects.

The invention relates to a method and a control device for operating an electrically driven fluid pump of a motor vehicle. The method comprises at least the following steps: specifying a target volume flow to be provided by the fluid pump. A first target rotational speed of a motor driving the fluid pump is determined as a function of the target volumetric flow to be provided, such that the fluid pump delivers the target volumetric flow if the motor is operating at the first target rotational speed constantly. The first target rotational speed is compared to a rotational speed boundary. And when the first target rotating speed is greater than the rotating speed boundary or equivalent to the rotating speed boundary, the motor operates at the first target rotating speed in the constant operation mode. When the first target rotational speed is less than a rotational speed boundary, the motor is operated in a pulse operating mode having a first time period within which the motor is operated and operated at a second target rotational speed, and a second time period within which the motor is shut down, the second target rotational speed of the electric machine is at least as large as the rotational speed boundary.

The present invention provides a dynamic and static scroll adaptive back pressure structure and a compressor, which are used to solve the problem of large suction and exhaust pressure difference in the prior art. The present invention provides a dynamic and static scroll adaptive back pressure structure, comprising: a static scroll, which is arranged on a static disk, and the static scroll is provided with a tooth top sealing groove and a first sealing strip placed in the first tooth top sealing groove; a dynamic scroll, which is arranged on a dynamic disk, and the static vortex and the dynamic vortex have opposite rotation directions and can cooperate to form a plurality of compression chambers, and the dynamic scroll is provided with a second tooth top sealing groove and a second sealing strip placed in the second tooth top sealing groove; a second ventilation groove is provided at the bottom of the second tooth top sealing groove along the rotation direction of the dynamic vortex, and the second ventilation groove is connected to the exhaust port of the static vortex; the dynamic vortex is provided on one side of the dynamic disk, and a medium pressure cavity is provided at the center position of the other side of the dynamic disk, and at least one back pressure hole is provided at the bottom of the second ventilation groove, and the back pressure hole is connected to the medium pressure cavity.

The present invention provides a compressor and a heat exchange system. The compressor includes a shell; a rotor pair; the compression flow channel has an air intake section, and the air intake section has an air intake connection state connected with the air intake chamber and an air intake disconnection state disconnected from the air intake chamber. The compressor and heat exchange system provided by the present invention use the pressure difference between the pressure of the first low-pressure chamber and the evaporation pressure of the evaporator or the pressure at the exhaust side bearing to return oil, which can ensure the oil return efficiency of the compressor, effectively solve the problem that the compressor cannot return oil under low pressure difference conditions, improve the operating reliability of the compressor, and broaden the operating range of the compressor. At the same time, there is no need to set up a pressurization structure such as an ejector in the prior art, thereby reducing the cost of the compressor.

The invention relates to a variable-frequency refrigerating system, air conditioning equipment and a control method. The variable-frequency refrigerating system comprises a cold supply tail end, a pipeline assembly, a plurality of variable-frequency refrigerating modules arranged in parallel and a plurality of variable-frequency water pumps arranged in parallel, and the variable-frequency refrigerating modules and the variable-frequency water pumps are connected with the cold supply tail end through the pipeline assembly; the frequency conversion refrigeration module comprises a compressor, a fan assembly and a heat exchanger assembly. The variable-frequency refrigeration module and the variable-frequency water pump of the variable-frequency refrigeration system can achieve variable-frequency control, the water pump and the refrigeration module can be matched in operation state under different working conditions, the operation range of the variable-frequency refrigeration system and the air conditioning equipment is expanded through the dual-variable-frequency design, and the system efficiency can be improved. Due to the fact that the variable-frequency refrigerating modules connected in parallel and the variable-frequency water pumps connected in parallel are arranged in the variable-frequency refrigerating system, redundant design of the refrigerating modules and the water pumps can be achieved, failure of the system due to damage of part of components is avoided, and the reliability and stability of the variable-frequency refrigerating system are improved.

This application provides a method and product for optimizing a nuclear power plant operation diagram. The method includes: obtaining the operating parameters corresponding to each boundary in the nuclear power plant operation diagram; for each boundary, determining the minimum margin of each core parameter of the nuclear power plant core at the boundary based on the corresponding operating parameters; adjusting the boundary position along the target direction when the difference between the target margin and the margin threshold exceeds a preset range, and there is room for adjustment at the endpoint position of the boundary in the target direction; the target margin is the minimum value of the minimum margin of each core parameter; updating the endpoint position of each boundary according to the position change of each boundary; updating the nuclear power plant operation diagram based on the endpoint position of each boundary. The above steps are repeated until the difference between the target margin and the margin threshold corresponding to each boundary is within a preset range, resulting in the final nuclear power plant operation diagram. The operation diagram obtained by this application can provide the maximum operating range for the core while ensuring the safe operation of the core.