99results about How to "Reduce heat transfer loss" patented technology

The invention discloses a high-temperature powder bed system for laser additive manufacture. The system comprises a working cavity, a laser device, a workbench, an electromagnetic heating layer, a heat insulation component and a laminar flow temperature uniforming component, the workbench is arranged in the working cavity, the electromagnetic heating layer is mainly composed of an electromagnetic induction plate and a coil, the electromagnetic heating layer is placed on the lower surface of the workbench and is attached to the workbench, and heat can be directly conducted to the workbench. A cooling flow way is arranged in the workbench, the bottom face and the side face of the electromagnetic heating layer are surrounded by the heat insulation component, and heat insulation and heat preservation of the electromagnetic heating layer can be achieved. The laminar flow temperature uniforming component is arranged outside the working cavity and used for achieving air flow circulation in the working cavity, and even temperature distribution of the workbench can be achieved. According to the part size, the work table board can be heated to be at the high temperature, heat preservation is performed, and temperature uniformization and the cooling functions after machining can be achieved. The aims of protecting the systems, and improving energy utilization rate and heating efficiency can be achieved.

An internal combustion engine includes a pre-chamber. In another aspect, pressure within a pre-chamber is equal to or greater than pressure within a main combustion chamber at least prior to ignition in the main combustion chamber. A further aspect provides a supplemental piston creating pressure and supplying a fuel-air mixture into a pre-chamber, and a spark or glow plug has an end located within the pre-chamber for ignition of the mixture therein. In yet another aspect, internal combustion engine control software automatically controls pressure within a turbulent jet ignition pre-chamber, controls a valve-actuator to admit a fuel-air charge into the pre-chamber, and causes an ignitor to initiate combustion in the pressurized pre-chamber. This also permits the rate of combustion to be controlled in the primary chamber regardless of the air-fuel ratio or the diluent fraction in the main chamber. Another aspect employs a pre-chamber purge pump with separate air and fuel injection. Moreover, an additional aspect separately supplies unmixed air and fuel into a turbulent jet ignition pre-chamber through a dual-mode, single injector unit.

The invention discloses an energy-saving device of a thermal power station, particularly discloses a high-flow, low-parameter and high-backpressure expansion power energy-saving system, comprising a turbine intermediate pressure cylinder and a heat supply backwater heater, which are connected by pipelines, the heat supply backwater heater is connected with a heat supply backwater main pipe and a heat supply backwater heater drain pipe, and the heat supply backwater heater drain pipe is connected with a turbine back-heat heating system, the high-flow, low-parameter and high-backpressure expansion power energy-saving system is characterized in that the pipeline between the turbine intermediate pressure cylinder and the heat supply backwater heater is provided with an expansion power machine. The high-flow, low-parameter and high-backpressure expansion power energy-saving system maximally reduces heat transfer loss between steam and heat supply hot water without influencing heat supply requirement, and converts part of energy in heat supply steam extraction process into high-quality power for output, so that energy is saved. The power output by the expansion power machine can drive generators or other power machines.

The invention discloses a double-crankshaft engine and belongs to the technical field of engines. The double-crankshaft engine comprises a piston and two crankshafts forming a double-crankshaft mechanism, and further comprises a cylinder block. The cylinder block comprises an air cylinder block part and a crankshaft supporting part. A piston guide rod is arranged at the lower end of the piston, the cylinder block is internally provided with a piston rod guide groove, the lower end of the piston is open and is provided with a piston end cover, and the piston end cover and the piston guide rod are detachably and fixedly connected; and the piston is a skirt-free piston with the piston guide end and the piston seal end separated, the piston seal end is a piston head, and the piston guide end is provided with the piston guide rod and the piston rod guide groove. The double-crankshaft engine is good in manufacturability, the piston is designed through isostress, strength is increased, abrasion-resisting design is adopted in a connecting part of a connecting rod and the piston, and the abrasion resisting performance and the reliability of the whole engine are improved.

The invention discloses an opposite-piston, two-stroke and variable-compression-ratio type gasoline engine, and relates to the field of internal combustion engines. The gasoline engine comprises a cylinder body, a gear synchronizing mechanism, a first spark plug, a second spark plug, a gasoline injector and a motor, wherein the cylinder body is connected with the gear synchronizing mechanism through a crankshaft; the first spark plug, the second spark plug and the gasoline injector are arranged on the outer circumferential wall of the cylinder body; the gear synchronizing mechanism provided with a gas feeding side gear and a gas exhausting side gear is connected to the motor; the gas feeding side gear is connected with a gas feeding side crankshaft; the gas exhausting side gear is connected with a gas exhausting side crankshaft; at least two intermediate gears are arranged between the gas feeding side gear and the gas exhausting side gear; the gas feeding side gear, the intermediate gears and the gas exhausting side gear which are engaged with each other are connected through connecting plates. According to the opposite-piston, two-stroke and variable-compression-ratio type gasoline engine, the movement phase difference of opposite pistons can be changed through the gear synchronizing mechanism, so that the cylinder working capacity can be changed when the opposite pistons are positioned at inner stopping points and outer stopping points, and as a result, the compression ratio of the gasoline engine in working can be varied.

The CS2 reactor furnace includes inner furnace body of refractory material, outer furnace body of refractory material, and heating chamber between the inner surface body and the outer furnace body. In the peripheral of the inner surface body, there are sulfur gasifying furnace and carbon material preheating furnace, and the sulfur gasifying, furnace is connected via sulfur vapor duct to the bottom of the inner furnace body. The CS2 reactor furnace of the present invention has no sulfurizing and oxidizing corrosion of inner furnace body and thus long service life. The material preheating speeds the reaction and raise the product yield. Heating the coal-burning gas furnace via the main fire channel communicated with the furnace body can save fuel and stabilize furnace temperature.

The invention relates to a micro-electrolysis water thruster which can utilize water or water solution, belonging to the micro-mechanical technique. It comprises: (1) a micro-electrolysis water thruster formed by three layered plates as a top plate, a bottom plate and spray plate with a one-way valve; (2) and a micro-electrolysis water thruster formed by layering top plate and bottom plate with high depth-width rate electrode or plane electrode without one-way valve. Wherein, the electrolysis reaction chamber is between the top and bottom plates which comprises an electrolysis anode and a electrolysis cathode; the burning chamber has a fire electrode; the hydrophobic film is plated on the inner surfaces of electrolysis reaction chamber and the burning chamber; and the one-way valve is between the burning chamber and the micro-spray pipe. The invention can generate hydrogen-oxygen mixed gas via the electrolyte of water to be fired to generate high-temperature high-pressure steam to be sprayed outside the spray pipe to form pushing power, which can improve the specific thrust property, thermal efficiency, responding speed and control accuracy, while its structure is compatible with MEMS to apply the micromation and integration.

The invention relates to an in-cylinder direct injection double-gas-fuel internal combustion engine capable of realizing ultra-lean combustion and a control method, aims to solve the problems that combustion is unstable in an ultra-lean-combustion mode of a gas fuel spark ignition type internal combustion engine, the oil consumption is high and emission is heavy under the work conditions of cold start and small load and the like and develops a spark ignition type in-cylinder direct injection double-gas-fuel internal combustion engine capable of realizing ultra-lean combustion and a control method of the internal combustion engine. The internal combustion engine adopts an internal combustion engine technology combining in-cylinder direct injection and gas inlet channel injection based on double gas fuel, the internal combustion engine is provided with a gas flow control device which cooperates with a piston roof in a special shape, and accordingly, good mixed gas layering is realized. According to the special combustion characteristic of gas fuel, ultra-lean mixed gas in higher compression ratio can be adopted; gas flow movement of the mixed gas entering a cylinder is controlled, meanwhile, gas inflow is increased, ultra-lean combustion of the mixed gas in the cylinder is realized, the heat transfer loss is reduced, the heat efficiency is improved, and oil consumption and pollutants are reduced.

The invention belongs to the technical field of engines, and relates to a lean burn engine and an automobile. The lean burn engine comprises a water spraying system and an electric control unit, wherein the water spraying system comprises air flue water sprayers, pressure sensors and a water supply device; the air flue water sprayers are connected with the water supply device through water pipes;the pressure sensors are used for detecting the pressure values of the water pipes and sending the pressure values to the electric control unit; the air flue water sprayers are arranged on air inlet channels of air cylinders of the engine and spray water to the air inlet channels; the electric control unit is in signal connection with the air flue water sprayers and the pressure sensors; and whenthe engine is in different work conditions, the pressure values of the water pipes change, the pressure sensors send corresponding signals to the electric control unit according to the different pressure values of the water pipes, and the electric control unit controls the air flue water sprayers to adjust the water spraying amount. According to the lean burn engine, the electric control unit controls the air flue water sprayers to adjust the water spraying amount according to different engine work conditions (loads), and efficient clean combustion of the engine is achieved.

A low-heat-loss diesel engine combustor structure comprises an air cylinder piston; a slope flow guiding conical surface and a lower vortex groove are coaxially formed in the top of the air cylinder piston; a flow guiding step surface is arranged between the lower vortex groove and the slope flow guiding conical surface; the included angle alpha between the flow guiding step surface and the slopeflow guiding conical surface is 120 degrees to 165 degrees; the included angle phi between the flow guiding step surface and the top surface of the air cylinder piston is 0 to 30 degrees; upper vortexgroove is formed in the portion, outside the lower vortex groove, of the top of the air cylinder piston; the projection width H of the flow guiding step surface on the top surface of the air cylinderpiston is 1 mm to 6 mm; the slope flow guiding conical surface is connected with the inner circumference of the flow guiding step surface through a first flow guiding arc; and the outer circumferenceof the flow guiding step surface is connected with the lower vortex groove through a second flow guiding arc. Through the design, fuel and flame can expand to the middle of a combustor, fuel is combusted fully, a high temperature region at the bottom of the piston moves to the middle of the combustor, and thus heat loads and heat transfer losses of the combustor are reduced.

The invention discloses a preparation method for a microporous membrane with structural self-regulating characteristics for membrane distillation. The microporous membrane is prepared by mixing a temperature-sensitive high-molecular material having hydrophilic/hydrophobic transition characteristics with temperature change and a high-molecular membrane material and adopting a phase separation method, and the obtained microporous membrane has a double-layer membrane structure composed of a hydrophobic layer and a hydrophilic layer, wherein thicknesses of the hydrophobic layer and the hydrophiliclayer can be automatically regulated according to operating temperature in the membrane distillation process. The microporous membrane for the membrane distillation disclosed by the invention has anautomatically-adjustable hydrophobic layer thickness adapted to the operating temperature, greatly reduces mass transfer resistance and improves a permeation flux of the membrane, and at the same time, the corresponding thickened hydrophilic layer can significantly reduce temperature difference polarization and heat transfer loss of the whole membrane, and effectively solve a contradiction betweenmass transfer and heat transfer in the membrane distillation process; and the microporous membrane improves the membrane distillation process characteristics and thermal efficiency, and especially facilitates direct contact type membrane distillation concentration separation by fully utilizing waste heat of a lower-temperature material liquid, and has good application prospects.

Two adjacent combustion chambers of existing four-stroke engine, one is only used for inspiration to compress, another is only used for expansion apply work to exhaust, the cylinder cover for compressing is not provided with an exhaust fungus valve and an exhaust passage for exhausting waste gas of the existing engine, the cylinder cover for apply work is not provided with an air intake fungus valve and an air intake channel for snifting of the existing engine, a channel is on the cylinder cover to communicate two cylinders, and is provided with a one way air valve for draining compressed gas into the channel on cylinder end for compressing, and is provided with an air valve with certain time obstruct channel closing to the cylinder end for apply work, catalysts are coated on the channel wall of the cylinder end for apply work or a heat accumulator is provided in the channel. The engine adopts catalysis or heat accumulation ignition, the combustion is completely exhausted, the structure is more simple than that of the existing reciprocating type four-stroke engine, the weight is lost and the efficiency is improved to realize that the expansion volume is larger than the compression volume.

The invention discloses an air source heat pump heating system capable of cascade heat storage, heat supply and defrosting. The air source heat pump heating system involves a refrigerant circuit and aheating hot water circuit, wherein the refrigerant circuit involves an evaporator, a four-way reversing valve gas-liquid separator, a compressor, a cascade phase change heat storage device, a condenser, a filter and an expansion valve; and the heating hot water circuit comprises the cascade phase change heat storage device, the condenser, a hot water circulation pump, and a heating end device. According to the air source heat pump heating system, compared with the prior art, stored heat can be directly used for heating, the intermediate link is greatly reduced, and the energy utilization efficiency of the system is improved; the system can achieve six operational mode adjustments according to working conditions, and the economic benefits and the energy-saving benefits are maximized; and the cascade phase change heat storage device provided by the air source heat pump heating system can be divided into a middle-low-temperature heat storage unit for heating and a lower-temperature heatstorage unit for defrosting of a heat pump, so that the cascade utilization of the heat is realized.

A solar water heating apparatus comprising inner and outer concentrically arranged vessels; a cavity defined between the vessels by an outer wall of the inner vessel and an inner wall of the outer vessel; a liquid-to-vapour phase change material provided in the cavity; an inlet for delivering unhealed water to the Inner vessel; and an outlet or withdrawing heated water from the inner vessel, and a pump which pumps the phase change material towards the inner wall of the outer vessel.

The invention relates to a novel special air conditioning system for a data center computer room. The novel special air conditioning system comprises an air treatment device, an air supply duct, a pore plate static-pressure air supply cabinet, a floor air return outlet and a floor air return static-pressure box. The floor air return static-pressure box is a computer room floor overhead layer. Theair treatment device is disposed in the computer room floor overhead layer or in an air conditioner room near the data center computer room. The pore plate static-pressure air supply cabinet is disposed in a cold passage. The floor air return outlet is disposed on the floor of a hot passage. The air is treated by the air treatment device and then is converted into cold air. The cold air passes through the air supply duct, enters the pore plate static-pressure air supply cabinet through an air supply hole at the bottom of the pore plate static-pressure air supply cabinet, and then enters an equipment cabinet for hot and cold exchange. The return air enters the floor air return static-pressure box from the air return outlet and is mixed with the outdoor fresh air in the air treatment device.The lower space of the overhead floor of the computer room is used as the air return static-pressure box to reduce a heat transfer loss. The pore plate static-pressure air supply cabinet and an IT cabinet achieve face-to-face air supply, so as to improve the distribution of the air supply airflow, and ensure the safe and stable operation of the computer room equipment.

The invention provides air treatment equipment. The air treatment equipment comprises an air conditioning box, a heat exchange device, a cold/heat source unit, a water-water heat pump unit and a controller, wherein the heat exchange device comprises at least two groups of heat exchangers which are sequentially arranged in the air conditioning box, and when air flows in the air conditioning box, the air is subjected to heat exchange with the heat exchange device in a step-by-step mode; the cold/heat source unit is used for outputting cold/hot water outside; and the water-water heat pump unit comprises a water-water heat pump machine, a first pipeline assembly and a second pipeline assembly, wherein the first pipeline assembly communicates with the first end of the water heat pump machine and is connected with the water-water heat pump machine, the second end of the water heat pump machine communicates with the second pipeline assembly, and any two sets of heat exchangers in the heat exchange device communicate with water-water heat pump unit. According to the air treatment equipment the cold water temperature is greatly improved, the heat supply hot water temperature is reduced, and therefore the energy efficiency of the heat source unit is improved; a cold source or a heat source with a single temperature is adopted, so that the complexity degree of the cold source and the heat source and a pipe network is greatly reduced, and engineering implementation and operation control are facilitated; and the air is subjected to step-by-step heat exchange in the heat exchange device, so that the temperature change of the air is matched with the temperature change of cold water and hot water, and the heat transfer loss is reduced.

The invention discloses a multistage gas liquefaction plant driven by a loop multistage thermoacoustic engine. The multistage gas liquefaction plant comprises M thermoacoustic engine units and pulse tube refrigerating machine units, wherein the pulse tube refrigerating machine units are connected with the outlets of the thermoacoustic engine units in a by-pass manner; M is a positive integer ranging from 3 to 6; a refrigerating unit comprises a refrigerating machine regenerator and a low-temperature end heat exchanger; each pulse tube refrigerating machine unit comprises two or more refrigerating units; multiple by-pass pipelines are arranged between each refrigerating machine regenerator and a corresponding pulse tube, so that the refrigerating machine regenerator and the corresponding pulse tube are connected to form at least one by-pass airflow passage; acoustic power generated through self-excitation of the thermoacoustic engine has thermoacoustic conversion in the refrigerating machine regenerators; the multiple low-temperature end heat exchangers are maintained under different refrigerating temperatures; and the to-be-liquefied gas sequentially passes through all low-temperature end heat exchangers to be liquefied in a temperature stepped decrease manner. The multistage gas liquefaction plant has no moving part, and is compact in structure and high in power density; the loop structure enables the engine units to be in the traveling wave phase; the multipath bypass structure realizes gas expansion refrigeration to improve the efficiency of a pulse tube refrigerating machine; and in addition, the multistage refrigerating units reduce the gas temperature in a stepped manner to effectively reduce the irreversible heat transfer loss.