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34results about How to "Realize secondary regulation" patented technology
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Method and system for coordination control of isolated microgrid frequency based on temperature control load
ActiveCN105762835AGive full play to the ability of frequency modulationGuaranteed comfortPower network operation systems integrationSingle network parallel feeding arrangementsMicrogridControl theory
The invention discloses a method and system for coordination control of isolated microgrid frequency based on a temperature control load, while ensuring the comfort level of users, uses a synergistic effect of an improved variable participation degree frequency modulation method for the temperature control load and an energy storage device frequency modulation method to realize secondary adjustment of microgrid system frequency, can give full play to a frequency modulation capability of the temperature control load, and can effectively lower a requirement for the capacity of the energy storage device, thereby well improving a microgrid frequency control effect. The method includes the steps of: S1. performing frequency modulation on a microgrid based on an improved user participation degree coefficient K<AC>, K<AC>=on%P<N> / (T<+>-T<->)*k<f>, wherein k<f> is an original user participation degree coefficient, on% is the proportion of the temperature control load in an on state under a stable running state, P<N> is rated power of the temperature control load, and T<+> and T<-> are set temperature limits for switching-on and switching-off of the temperature control load; and S2. performing frequency modulation on the microgrid again based on the energy storage device.
Owner:NORTH CHINA UNIVERSITY OF TECHNOLOGY
Phenolphthalein polyarylether ketone foam material and preparation method thereof
The invention provides a phenolphthalein polyarylether ketone foam material and a preparation method thereof and belongs to the technical field of processing of high polymer materials. The method comprises the following steps: performing mold pressing on phenolphthalein polyarylether ketone on a vulcanizing press so as to obtain a cross-linked phenolphthalein polyarylether ketone template; swelling and permeating the cross-linked phenolphthalein polyarylether ketone template in supercritical CO2, performing rapid pressure relief, taking out foam from a high-pressure autoclave, cooling to room temperature, thereby obtaining the phenolphthalein polyarylether ketone foam material, wherein the phenolphthalein polyarylether ketone foam material is amorphous. The invention further provides a phenolphthalein polyarylether ketone foam material. The polyarylether ketone foam material disclosed by the invention has the advantages that the carbon dioxide solubility is high, the foaming ratio is high, and foam bubble growth is not limited by a crystalline region; the foam structure can be further controlled by controlling the degree of crosslinking.
Owner:芜湖万隆新材料有限公司
Preparation method of graphene/carbon nano tube co-reinforced conducting polymer hydrogel
InactiveCN105244190AImprove mechanical propertiesImprove conductivityHybrid capacitor electrodesHybrid/EDL manufactureCapacitancePolymer science
The invention relates to a preparation method of graphene / carbon nano tube co-reinforced conducting polymer hydrogel. The method comprises the following steps that: (1) carbon nano tubes are added into a polystyrene sulfonate and graphene oxide aqueous solution, and the mixture of the carbon nano tubes and the polystyrene sulfonate and graphene oxide aqueous solution are stirred; (2) a conducting polymer monomer is added into the solution obtained in the step (1), and the mixture of the conducting polymer monomer and the solution is stirred, and the concentration of the conducting polymer monomer ranges from 0.05 to 0.5mol / L; (3) an oxidant solution is added into the reaction system obtained in step (2), and the mixture of the oxidant solution and the reaction system is stirred, and ratio of the conducting polymer to the oxidant ranges from 1:3 to 1:30; (4) the mixture of the oxidant solution and the reaction system stands and reacts, and a product obtained in the step (3) is purified and balanced in distilled water, so that the graphene / carbon nano tube co-reinforced conducting polymer hydrogel can be obtained; and (5) the hydrogel obtained in the step (4) is soaked in hydriodic acid, so that the graphene / carbon nano tube co-reinforced conducting polymer hydrogel can be obtained. Compared with a pure conducting polymer hydrogel, the graphene / carbon nano tube co-reinforced conducting polymer hydrogel has high conductivity and super capacitance performance.
Owner:SHANDONG UNIV OF SCI & TECH
Cooling system for realizing high-precision temperature control and control method of cooling system
ActiveCN109798717AGuaranteed stabilityReduce energy consumptionLighting and heating apparatusCooling fluid circulationTemperature controlCold season
The invention discloses a cooling system for realizing high-precision temperature control. The cooling system comprises a process cooling water loop and a frozen water loop. The process cooling waterloop comprises a heat exchanger for cooling, a water storage tank, a process cooling water pump and a heat exchanger for temperature control. The frozen water loop comprises a first refrigerating machine, a second refrigerating machine, a buffer water tank, a chilled water pump, a third valve, a heat exchanger for cooling, a water flow control device of the heat exchanger for cooling, a heat exchanger for temperature control, a water flow control device of the heat exchanger for temperature control, a fourth valve, a fifth valve and a sixth valve. The invention further discloses a control method of the cooling system for realizing high-precision temperature control. By adjusting the valves, the frozen water loop forms a conventional mode frozen water loop, a free cooling mode free cold water loop, and a free cooling mode frozen water loop. According to the cooling system for realizing high-precision temperature control and the control method of the cooling system, the problem of watertemperature precision control of the cooling system with large loads and being prone to stepping is solved, energy waste is avoided, stability is maintained, the free cooling mode can be used in the cold season, and the system energy efficiency is greatly improved.
Owner:SOUTHEAST UNIV
System and process for pulverized coal injection of blast furnace
ActiveCN102787191AEvenly distributedGuaranteed gas adjustment functionBlast furnace componentsBlast furnace detailsEngineeringTransportation technology
The invention provides a system and a process for pulverized coal injection of a blast furnace. The system comprises a plurality of parallel injection tanks, fluidization tanks, injection branch pipes, coal injection valves, an injection main pipe, a charging pipeline, a charging valve, a pressure stabilizing pipeline, a pressure stabilizing valve, a gas supplementing pipeline, a gas supplementing regulating valve, a pulverized coal flow regulating valve and a pulverized coal flow meter, wherein one fluidization tank is arranged at the bottom of each injection tank, one injection branch pipe is connected with an outlet of each injection tank, one coal injection valve is arranged on each injection branch pipe, the charging pipeline and the pressure stabilizing pipeline are connected with each injection tank, the injection main pipe is vertically arranged, the pulverized coal flow regulating valve and the pulverized coal flow meter are arranged on the injection main pipe from bottom to top, the gas supplementing pipeline is connected to the bottom end of the injection main pipe, and the gas supplementing regulating valve is arranged on the injection main pipe and below the joints of the injection branch pipes and the injection main pipe. By the aid of the system and the process, pulverized coal can be uniformly and stably injected, injection quantity is accurately controlled, pulverized coal dense phase transportation technology can be realized, gas consumption is low, and pipeline abrasion is less.
Owner:WISDRI ENG & RES INC LTD
Fabric cutting device capable of adapting to belt conveying
ActiveCN106854830AReduce lifting speedAvoid situations that damage the conveyor beltSevering textilesMetal working apparatusEngineeringMechanical engineering
The invention relates to a fabric cutting device capable of adapting to belt conveying. The fabric cutting device comprises a feeding device, the feeding device is provided with a fabric cutting frame, the fabric cutting frame is provided with a cutting device, the cutting device comprises a cutter sleeve on the fabric cutting frame, the lower portion of the cutter sleeve is provided with a cutter groove, the cutter groove is communicated with the cutter sleeve, and a cutter lifting pull rod matched with a cutter in the cutter groove is arranged in the cutter groove, the upper portion of the cutter lifting pull rod is hinged to a cutting rotating base, a cutting rotating rod is further hinged to the cutting rotating base, the other end of the cutting rotating base sleeves a sleeving shaft on a cutting mounting plate on the fabric cutting frame, the other end of the cutting rotating rod is connected to a cutting rotating sleeve, and the cutting rotating sleeve is matched with a cutting lifting motor on the cutting mounting plate. The cutter lifts or descends through the hinged cutter lifting pull rod, the cutting rotating rod and the cutting rotating base, a maximum lifting and descending range is limited, the lifting or descending speed can be slowed down through regulation, and damage to a conveying belt by the cutter is avoided greatly.
Owner:华清(扬州)织物有限公司
Dynamic observation and regulating system for air floatation microbubbles
ActiveCN106629954ASmall sizeRealize secondary regulationWater treatment parameter controlParticle size analysisProblem of timeMicrobubbles
The invention discloses a dynamic observation and regulating system for air floatation microbubbles. The dynamic observation and regulating system has the advantages that the light barrier type particle counting principle is utilized to monitor bubble size in real time, and the problem of time lag of traditional bubble size measuring is solved; secondary regulating of the bubble size is achieved by a bubble regulating plate, and the limitation of excessively small regulating range is solved; real-time and accurate measuring of the bubbles is achieved, and the flexibility of air floatation treatment is increased.
Owner:XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
Heat storage adjusting system based on combined cooling heating and power and adjustment method thereof
ActiveCN106440902ARealize secondary regulationImprove buffering effectHeat storage plantsEnergy industryCogenerationElectric heating
The invention discloses a heat storage adjusting system based on combined cooling heating and power and an adjustment method thereof, and belongs to the technical field of heat exchange management. The adjusting system comprises a PLC controller module, an upper computer, an after-burning afterheat boiler, a shunting adjustment module, a heat storage box set, an electric heating module, an afterheat dispatching module and a user load bus. The adjustment method comprises the following steps: (1) system initialization parameters are set; (2) the system start and parameters are set; (3) the outer ring bus energy supply is adjusted; a winter mode is operated in winter; a summer mode is operated in summer; and the afterheat dispatching module is adjusted according to difference of the operation modes to maintain the temperature of the user load bus constant; (4) the inner ring load energy supply is adjusted; (5) the afterheat recovery energy is adjusted; (6) the commercial power heat storage energy is adjusted; and (7) the reception of stop signals due to fault generation of the system or season change is judged; if so, the system stops working; and if not, the step (3) is returned for operation.
Owner:NORTHEASTERN UNIV
Monitor fixing base
Owner:CHENGDU BESTVISION TECH
Valve member and displacement adjustment system
PendingCN111911796AQuick responseThe output curve is smoothValve arrangementsLubricating pumpsPressure curveEngineering
The invention provides a valve member and a displacement adjusting system, and relates to the technical field of internal combustion engine lubricating systems. The valve member comprises a containingmember provided with a containing cavity, and a third cavity located between a first cavity and a second cavity is formed in the containing cavity. A second hole part for communicating the second cavity with the outside and a fourth hole part for communicating the third cavity with the outside are formed in the containing member. In the first working state of a valve element assembly, when the valve element assembly can move from the first preset position to the second preset position, the second hole part communicates with the fourth hole part through the third cavity. The valve member is applied to the displacement adjusting system, secondary adjustment of the displacement of a variable pump is achieved through cooperative control over a control valve and the valve member, and comparedwith a traditional double-adjusting-cavity variable pump, the valve member is high in response speed and stable in variable control. In addition, the pressure curve output by the displacement adjusting system is more suitable for the requirements of an engine, and the output curve of the high-pressure controlled variable pump is stable.
Owner:FAWER AUTOMOTIVE PARTS
Gyrating type electro-hydraulic driver and control method
ActiveCN108679018ARealize slow adjustmentNo wasteServomotor componentsServomotorsHydraulic motorMotor drive
The invention provides a gyrating type electro-hydraulic driver and a control method, and belongs to the technical field of fluid transmission and control. The gyrating type electro-hydraulic driver comprises a servo motor, a bidirectional variable hydraulic pump which is arranged on an output shaft of the servo motor, a bidirectional hydraulic motor, a signal acquiring unit and a control unit, wherein two ends of two oil channels of the bidirectional hydraulic motor are correspondingly connected to a first connector and a second connector of the bidirectional variable hydraulic pump; the control unit is used for receiving a signal fed back by the signal acquiring unit and is correspondingly connected to the servo motor and the bidirectional variable hydraulic pump to form two independentcontrol closed loops, thus realizing two-stage control of the bidirectional hydraulic motor. According to the gyrating type electro-hydraulic driver and the control method, the servo motor drives thebidirectional variable hydraulic pump to realize rotating output of the bidirectional hydraulic motor; the size is small; the power consumption is low; and moreover, the two-stage adjusting of the bidirectional hydraulic motor is achieved through the two independent control closed loops of the control unit, and thus the cost is not obviously increased while the output range of the bidirectional hydraulic motor is expanded.
Owner:YANSHAN UNIV
Tank surface polishing method
ActiveCN111843624AEasy to polishRealize secondary regulationGrinding carriagesBelt grinding machinesEngineeringMechanical engineering
The invention discloses a tank surface polishing method, and belongs to the field of tank processing. The tank surface polishing method comprises the following steps of first, placing a tank onto a rotary table, and then enabling a polishing device to be on one side of the tank through adjustment with an adjusting device; second, driving a first driving cylinder and a second driving cylinder to work respectively, enabling a polishing mechanism to make contact with the end of the side face of the tank, controlling a polishing head driving mechanism to drive the polishing mechanism to work, andcontrolling the polishing mechanism to ascend or descend gradually at the same time to complete polishing from one end to the other end of the side face of the tank; third, enabling the rotary table to rotate for some distance, then controlling the polishing mechanism to work continuously, and controlling the polishing mechanism to ascend or descend gradually; and fourth, repeating the third steptill the whole side face of the tank is polished. With the tank surface polishing method, secondary angle adjustment can be carried out on the polishing mechanism, the whole tank can be accurately polished, and therefore, all-around polishing is achieved.
Owner:安徽省华夏机床制造有限公司
Novel special lifting hook for crane
PendingCN111908327AEasy to fixRealize secondary regulationLoad-engaging elementsMarine engineeringElectric machinery
Owner:徐州祥瑞工程机械科技有限公司
A kind of tank body surface grinding method
ActiveCN111843624BEasy to polishRealize secondary regulationGrinding carriagesBelt grinding machinesPhysicsGrinding
The invention discloses a method for grinding the surface of a tank body, which belongs to the field of tank body processing. It includes the following steps: 1. Place the tank body on the turntable, then adjust the grinding device to one side of the tank body through the adjusting device; The end of the side is in contact, and the grinding head driving mechanism is controlled to drive the grinding mechanism to work. At the same time, the grinding mechanism is controlled to rise or fall gradually to complete the grinding from one end to the other end of the side of the tank; 3. Turn the turntable to rotate for a certain distance, and then control the grinding mechanism Continue to work, and at the same time, control the grinding mechanism to rise or fall gradually; 4. Repeat the work of step 3 until the grinding of all positions on the side of the tank body is completed. The invention can perform secondary angle adjustment on the grinding mechanism to complete the precise grinding of each position of the large tank body, and the grinding is comprehensive.
Owner:安徽省华夏机床制造有限公司
Immersed tube sinking device with adjustable distance
ActiveCN111636457AImprove placement accuracyImprove convenienceCaissonsElectrical and Electronics engineeringMechanical engineering
The invention discloses an immersed tube sinking device with an adjustable distance. The immersed tube sinking device comprises a guide part, a sinking assembly and a driving assembly, wherein at least part of the structure of the guide part is used for being inserted into the water bottom; the sinking assembly comprises a connecting frame and a sinking body, the connecting frame is used for beingfixedly connected with an immersed tube, and the sinking body is slidably arranged on the connecting frame in the direction close to or away from the guide part and is connected with the guide part in a lifting mode; and the driving assembly is arranged on the connecting frame and is connected with the sinking body, and the driving assembly drives the sinking body to slide. According to the technical scheme, the sinking precision of the immersed tube can be improved, and meanwhile, the use convenience of the immersed tube sinking device can be improved, and the safety of the guide part in butt joint with the sinking assembly is improved.
Owner:CHINA CONSTR ENG HONG KONG
Lens optical axis offset method convenient for secondary adjustment
The invention provides a lens optical axis offset method convenient for secondary adjustment. A front lens group, a relay image rotation front group, a first reflector, a second reflector, a relay image rotation rear group, a detector protection window, a detector induction surface and an inclined cushion block form an optical axis offset system; an included angle of 45 degrees is formed between the first reflecting mirror and the relay image inversion front group, and the second reflecting mirror is perpendicular to the first reflecting mirror; the long side direction of the detector sensingsurface is defined as the x axis of the coordinate system, and a certain included angle is formed between the connecting line of the front lens group center and the detector sensing surface center andthe x axis; the inclined cushion block is of a triangular prism structure, the edge is arranged along the length direction of the lens cone, and the upper edge is parallel to the connecting line of the center of the front lens group and the center of the detector sensing surface; by adjusting the inclination angle of the side, close to the lens cone, of the inclined cushion block, deviation of the optical axis can be achieved.
Owner:北京长峰科威光电技术有限公司
A kind of polyaryletherketone foam material containing phthalein side group and preparation method thereof
The invention provides a phenolphthalein polyarylether ketone foam material and a preparation method thereof and belongs to the technical field of processing of high polymer materials. The method comprises the following steps: performing mold pressing on phenolphthalein polyarylether ketone on a vulcanizing press so as to obtain a cross-linked phenolphthalein polyarylether ketone template; swelling and permeating the cross-linked phenolphthalein polyarylether ketone template in supercritical CO2, performing rapid pressure relief, taking out foam from a high-pressure autoclave, cooling to room temperature, thereby obtaining the phenolphthalein polyarylether ketone foam material, wherein the phenolphthalein polyarylether ketone foam material is amorphous. The invention further provides a phenolphthalein polyarylether ketone foam material. The polyarylether ketone foam material disclosed by the invention has the advantages that the carbon dioxide solubility is high, the foaming ratio is high, and foam bubble growth is not limited by a crystalline region; the foam structure can be further controlled by controlling the degree of crosslinking.
Owner:芜湖万隆新材料有限公司
Adjustable pulse vortex generator
PendingCN108128634AAdjustable intensityThe overall structure is simple and reliableBulk conveyorsInlet valveEngineering
Disclosed is an adjustable pulse vortex generator. The adjustable pulse vortex generator comprises a split type shell, an inlet pipe, a pulse airflow inlet hole plate, a guide-rod-type one-way air inlet valve, a pulse airflow intensity adjusting plate, a ratchet type self-locking adjusting rod assembly, an axial rotation-starting blade pipe and an outlet adjusting pipe; and the split type shell comprises a left shell, a middle shell and a right shell which are arranged coaxially in the left-and-right direction, the axial rotating blade pipe is arranged in middle shell in the coaxial direction,lateral inlet holes are formed in the top portion of the middle shell in the radial direction, a pulse vortex rotation-starting channel is formed between the middle shell and the right side of the axial rotation-starting blade pipe, and a central hole of the axial rotation-starting blade pipe is a channel of axial airflow and materials. The adjustable pulse vortex generator is wide in applicationrange, the minimum airflow velocity of the materials can be reduced, the transmission energy consumption is reduced, the pipeline wearing is alleviated, the particle breakage is decreased, the intensity and frequency of the generated pulse vortex are adjustable, and adjustable pulse vortex generator is applied to pneumatic conveying systems of coarse particle materials.
Owner:NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
A Dynamic Observation and Control System of Air Flotation Microbubbles
ActiveCN106629954BSmall sizeRealize secondary regulationWater treatment parameter controlParticle size analysisProblem of timeMicrobubbles
The present invention realizes the real-time monitoring of the bubble size through a dynamic observation and control system of the air-floating micro-bubbles by using the principle of optical barrier particle counting, and overcomes the problem of time lag in the traditional measurement of the bubble size; The secondary control of size solves the limitation of too small control range; the present invention realizes real-time and accurate measurement of bubbles through a dynamic observation and control system of air flotation micro-bubbles, expands the range of bubble size adjustment, and improves air Float handling flexibility.
Owner:XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
Intelligent control method of fresh cold chain logistics transportation and storage environment based on real-time monitoring of environmental characteristics
ActiveCN113119837BMeet the storage environment humidity requirementsGuaranteed freshnessFruit and vegetables preservationRefrigerated goods vehicleCold chainAgricultural engineering
The invention discloses an intelligent control method for the storage environment of fresh cold chain logistics transportation and storage based on real-time monitoring of environmental characteristics. By installing a control terminal on the inner wall of the compartment of the cold chain transport vehicle, the humidification control device in the control terminal realizes the cooling of fresh fruits and vegetables. The intelligent control of the storage environment humidity in the chain logistics transportation improves the flexibility and pertinence of the control, makes the control results more accurate, and can better meet the storage environment humidity requirements corresponding to the cold chain logistics transportation of fresh fruits and vegetables, which in turn is conducive to ensuring freshness. The freshness of fruit and vegetable storage; the stable control device in the control terminal realizes the direct control of the stability of the fresh fruit and vegetable stacking frame in the fresh fruit and vegetable cold chain logistics transportation, enhances the control effect, and greatly reduces the stability of the fresh fruit and vegetable stacking frame The poor control effect leads to the collision of the stacking frame of fresh fruits and vegetables, which leads to the decline of the quality of fresh fruits and vegetables, which is conducive to ensuring the quality of fresh fruits and vegetables stored.
Owner:广东顶鑫农业供应链集团有限公司
System and process for pulverized coal injection of blast furnace
ActiveCN102787191BEvenly distributedGuaranteed gas adjustment functionBlast furnace componentsBlast furnace detailsThermodynamicsProcess engineering
Owner:WISDRI ENG & RES INC LTD
Self-pressing plantlet infusion bag
InactiveCN105766407ATo achieve continuous pressureRealize the secondary adjustment functionHorticulture methodsEmergency medicineAtmospheric pressure
The invention provides a self-pressing plantlet infusion bag which comprises an infusion bag, wherein an air pressure unit communicating with the infusion bag body is installed on the upper end of the infusion bag body; and the air pressure unit communicates with the infusion bag by a valve unit. In conclusion, the infusion bag provided by the preferential scheme of the invention is characterized in that the air pressure unit and the valve unit which communicate with the infusion bag are installed on the upper end of the infusion bag, so that continuous pressure supply of the infusion bag is carried out, and liquid supply suspension caused by soil blocking can be avoided; and by the valve unit, a second-level adjustment function is further carried out. The infusion bag has the advantages that the overall structure is simple; practicability is high; the cost is low; and the infusion bag can be widely applied in landscaping companies and municipal construction.
Owner:SHAANXI TANGYUAN GARDEN LANDSCAPE CONSTR CO LTD
Coordinated control method and system for frequency of isolated microgrid based on temperature-controlled load
ActiveCN105762835BGive full play to the ability of frequency modulationGuaranteed comfortPower network operation systems integrationSingle network parallel feeding arrangementsMicrogridEngineering
Owner:NORTH CHINA UNIVERSITY OF TECHNOLOGY
Heavy multi-axle vehicle steering system based on hydraulic transformer and control method thereof
ActiveCN112918552AReduce the burden onReduce energy consumptionSteering linkagesFluid steeringSteering angleControl system
The invention provides a heavy multi-axle vehicle steering system based on a hydraulic transformer. The vehicle steering system comprises a plurality of steering axles arranged in sequence, wherein a power-assisted steering cylinder for driving a steering axle is arranged in the steering axle; the power-assisted steering cylinder is connected with a servo proportional valve and a hydraulic transformer combination device; the same hydraulic transformer combination device is used for controlling part of steering shafts with relatively small differences of steering angles and steering resistance torques under most working conditions and steering modes, and during use, the control system identifies the expected oil supply pressure of each steering shaft and outputs hydraulic pressure suitable for each steering resistance torque; energy consumption is reduced to the greatest extent while the heavy multi-axle vehicle smoothly completes the steering action; and through series and parallel connection switching loops, a problem that the super-large steering resistance moment is difficult to overcome to complete steering under the extreme working condition is further solved. By means of the process, energy consumption generated by a heavy multi-axle vehicle steering system is comprehensively reduced, and meanwhile the original good steering characteristic of the heavy multi-axle vehicle steering system is guaranteed.
Owner:FUZHOU UNIV
A cooling system for realizing high-precision temperature control and its control method
ActiveCN109798717BGuaranteed stabilityReduce energy consumptionLighting and heating apparatusAir conditioning systemsCold seasonTemperature control
The invention discloses a cooling system for realizing high-precision temperature control. The cooling system comprises a process cooling water loop and a frozen water loop. The process cooling waterloop comprises a heat exchanger for cooling, a water storage tank, a process cooling water pump and a heat exchanger for temperature control. The frozen water loop comprises a first refrigerating machine, a second refrigerating machine, a buffer water tank, a chilled water pump, a third valve, a heat exchanger for cooling, a water flow control device of the heat exchanger for cooling, a heat exchanger for temperature control, a water flow control device of the heat exchanger for temperature control, a fourth valve, a fifth valve and a sixth valve. The invention further discloses a control method of the cooling system for realizing high-precision temperature control. By adjusting the valves, the frozen water loop forms a conventional mode frozen water loop, a free cooling mode free cold water loop, and a free cooling mode frozen water loop. According to the cooling system for realizing high-precision temperature control and the control method of the cooling system, the problem of watertemperature precision control of the cooling system with large loads and being prone to stepping is solved, energy waste is avoided, stability is maintained, the free cooling mode can be used in the cold season, and the system energy efficiency is greatly improved.
Owner:SOUTHEAST UNIV
Independent temperature and humidity control system and implementation method of airtight cabin of space vehicle
ActiveCN103225857BRealize decoupling controlOvercoming the Insufficiency of Extensive Humidity RegulationSpace heating and ventilation safety systemsLighting and heating apparatusControl systemAir temperature
The invention belongs to the technical field of thermal control of an environment of a sealed cabin of a space aircraft, and relates to an independent temperature and humidity control system for a sealed cabin of a space aircraft and an implementation method. By means of the design of the independent air temperature and humidity control system structure and the implementation method, decoupling control on the temperature and the humidity of air in the sealed cabin of the space aircraft is achieved, the defect that control requirements of double targets of the temperature and the humidity of the air are difficult to meet by means of an integrated temperature and humidity control system is overcome, and the detailed requirement for controlling the temperature and the humidity of the sealed cabin of a future space aircraft is met.
Owner:BEIJING INST OF SPACECRAFT SYST ENG
Steering system and control method of heavy-duty multi-axle vehicle based on hydraulic transformer
ActiveCN112918552BReduce the burden onReduce energy consumptionSteering linkagesFluid steeringSteering angleDrag torque
The present invention proposes a heavy-duty multi-axle vehicle steering system based on a hydraulic transformer. The vehicle steering system includes a plurality of sequentially arranged steering axles; the steering axle is provided with a steering assist cylinder for driving the steering axle; the steering assist cylinder is connected to the steering axle. The servo proportional valve and the hydraulic transformer combination device are connected; and the same hydraulic transformer combination device controls most of the working conditions and some steering shafts with small differences in steering angle and steering resistance torque under the steering mode. When in use, the control system recognizes the desired The oil supply pressure of the steering shaft is large, and the hydraulic pressure suitable for each steering resistance torque is output, so that the heavy multi-axle vehicle can successfully complete the steering action while minimizing energy consumption; and through the series and parallel switching circuits, the extreme Under working conditions, it is difficult to overcome the problem of over-large steering resistance torque to complete the steering. Through the above process, the present invention comprehensively reduces the energy consumption produced by the steering system of the heavy-duty multi-axle vehicle, and at the same time ensures its original good steering characteristics.
Owner:FUZHOU UNIV
Compression hemostasis assembly and clinical laboratory hemostat
The invention discloses a compression hemostasis assembly and a clinical laboratory hemostat. The compression hemostasis assembly comprises a connecting plate, the top of the connecting plate is fixedly connected with a frame, the left side of the frame is fixedly connected with a positive and negative tooth lead screw, and the left end of the positive and negative tooth lead screw penetrates through the frame and is movably connected with the frame through a bearing. One end of a strap is pulled outwards by a single hand to tighten the strap, the artery of a patient is pressed by the aid of pulling force, and the strap is fixed by the other hand, so that a single person can conveniently operate the hemostasis device, and the strap is squeezed by a pressing plate, so that an existing point fixing mode can be replaced by a line fixing mode, the fixing area is increased, the strap is prevented from loosening, and the problems that the service life of a hemostasis device is affected and the hemostasis effect is affected are solved.
Owner:冯祝干
Frequency control method and system of microgrid converter based on virtual synchronous generator
ActiveCN109861280BRealize secondary regulationFrequency easyPower network operation systems integrationSingle network parallel feeding arrangementsVirtual synchronous generatorConverters
The invention provides a frequency control method and system of a micro-grid converter based on a virtual synchronous generator, belonging to the technical field of frequency control of micro-grid converters. The control method includes the following steps: 1) the micro-grid converter is controlled by a virtual synchronous machine model, and by controlling the mechanical torque of the virtual synchronous machine model, the frequency of the micro-grid converter can be adjusted once; Under one adjustment, when the output power of the microgrid converter and the load are balanced, the electromagnetic power of the virtual synchronous machine model is used as the dynamic load compensation amount to compensate the mechanical power of the virtual synchronous machine model. The beneficial effects of the invention are: when the output power of the micro-grid converter and the load reach a balance, by using the electromagnetic power of the virtual synchronous machine model as the dynamic load compensation amount to compensate the mechanical power of the virtual synchronous machine model, the micro-grid is realized. The secondary adjustment of the converter frequency makes the frequency of the microgrid converter stable at the rated frequency, which is simple to implement.
Owner:XIAN XJ POWER ELECTRONICS TECH +3
A heat storage regulation system based on cogeneration of cooling, heating and power and its regulation method
ActiveCN106440902BRealize secondary regulationImprove buffering effectHeat storage plantsEnergy industryLoad busEnergy regulation
A heat storage regulation system and its regulation method based on combined cooling, heating and power generation belong to the technical field of heat exchange management. The regulating system includes PLC controller components, host computers, supplementary combustion waste heat boilers, shunt regulating components, heat storage box groups, electric heating components, waste heat dispatch components and user load buses. Adjustment method: Step 1: Set system initialization parameters; Step 2: System startup and parameter tuning; Step 3: Adjust the outer ring bus energy supply; if it is winter, run winter mode; if it is summer, run summer mode; Adjust the waste heat dispatch component according to different operating modes to maintain a constant temperature of the user load bus; Step 4: Adjust the inner loop load energy supply; Step 5: Adjust the waste heat recovery energy; Step 6: Adjust the mains heat storage energy ; Step 7: Determine whether the system fails or receives a shutdown signal due to seasonal changes. If yes, the system ends. If not, return to step 3.
Owner:NORTHEASTERN UNIV LIAONING
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