106results about How to "Stable working pressure" patented technology

The invention relates to a micro-nano bubble oxygenation drip irrigation system and a micro-nano bubble oxygenation drip irrigation method. The system comprises a water inlet main pipe, wherein the water inlet main pipe is connected with two branches in parallel, and a first branch is sequentially connected with a water pump, a pressure stabilizing tank and a pipe pump; a spray nozzle which stretches into the pressure stabilizing tank is arranged at an inlet end of the pressure stabilizing tank, and a pressure stabilizing valve is arranged at the top of the pressure stabilizing tank; a pressure gauge is arranged on an outlet pipeline of the pipe pump; a flow regulating valve and a pressure gauge are sequentially connected onto a second branch; the two branches converge to form a water outlet main pipe; the position, at an inlet of the water pump, of the first branch is connected with an outlet of an air pump through an electromagnetic valve and an inlet of the air pump is respectively connected with a pure oxygen source and an ozone source; a one-way valve and a gas flowmeter are sequentially arranged between the pure oxygen source and the air pump; a one-way valve and a gas flowmeter are sequentially arranged between the ozone source and the air pump; the pipe pump is electrically connected with a frequency conversion cabinet, the frequency conversion cabinet is electrically connected with a power distribution box through an electromagnetic valve and the power distribution box is electrically connected with a programmable controller; the flow regulating valve, the pressure gauges, the electromagnetic valves, the gas flowmeters, the water pump, the pipe pump and the power distribution box are respectively and electrically connected with the programmable controller.

The invention provides a tobacco stalk pre-processing method and tobacco stalk pre-processing equipment which can shorten the water permeability time of the tobacco stalk, ensure consistent moisture of the soaked tobacco stalk, save the storage process of the moistening of the tobacco stalk and simplify the process flow. The method comprises the following steps of: feeding a tobacco stalk material into a screw conveyer which is filled with steam and keeps proper pressure and proper temperature; continuously feeding the tobacco stalk material into the screw conveyer through a feeding vapor lock; continuously discharging the tobacco stalk material through a discharging vapor lock; and increasing the moisture and the temperature of the tobacco stalk to meet the requirements of the stalk pressing and cutting process on the discharging temperature and the moisture. The equipment comprises a bearing screw conveyer with a steam inlet and a water drainage port; a feed port and a discharge port of the screw conveyer are provided with the feeding vapor lock and the discharging vapor lock respectively; and the feeding vapor lock is provided with a water replenishing port. The water permeability of the tobacco stalk is improved by increasing the pressure and the temperature of the moistening environment of the tobacco stalk, so that the method and the equipment shorten the water permeability time of the tobacco stalks, quickly realize the pre-processing effect of the moistening of the tobacco stalk, save the storage process of the moistening of the tobacco stalk and greatly simplify the process flow of the stalk processing.

The invention relates to a comprehensive testing device for the anti-clogging performance of drip irrigation emitters. The comprehensive testing device is characterized by comprising a frame, wherein a water supply system is arranged below the frame; a drip irrigation system is arranged above the frame; a composite moving device is arranged below the drip irrigation system; a water collecting tank is arranged under the composite moving device; the water supply system comprises an adjusting water tank; a water pump suction pipe is arranged on the side face of the adjusting water tank; the other end of the water pump suction pipe is connected to a water pump; the water outlet pipe of the water pump is connected to primary shunt pipes and secondary shunt pipes respectively; the primary shuntpipes extend into the adjusting water tank respectively; the tail ends of the secondary shunt pipes are connected to a filter bank respectively; the filter bank is connected to the drip irrigation system respectively; the drip irrigation system comprises a drip irrigation pipe, a plurality of drip irrigation emitters and a plurality of water holding units; and the water holding units are arrangedon the top of the composite moving device. The comprehensive testing device can be used for solving the problems of single function, low intelligent degree, not high test accuracy and the like of thepreceding anti-clogging performance testing device, and can be widely applied to the comprehensive test of the anti-clogging performance of the drip irrigation emitters.

The invention provides a rolling friction cylinder hydraulic type force standard machine which belongs to the technical field of mechanical engineering. The main body of the hydraulic type force standard machine consists of a rolling friction plunger type hydraulic cylinder I used as the core and a communicating vessel formed by two rolling friction plunger type hydraulic cylinders according to the Pascal principle. The complete hydraulic type force standard machine also comprises a force measuring instrument, a frame, a rolling friction cylinder II, a displacement sensor, a counterweight, a hydraulic oil feeding system and a hydraulic subsidiary loop. The force standard machine has high working precision; oil cylinder structure and the manufacturing process are simplified; the loading time can be efficiently controlled in the working process; the high pressure hydraulic pump is unnecessary; no pressure and flow pulsation phenomenon exists; the flow control is precise and stable; the minimum stable flow requirement can be met by controlling the precise displacement of plungers; and the stable and accurate system working pressure is maintained.

A safety valve element for battery use which ruptures at a stable pressure range so as to release the inner pressure of the battery is disclosed. The safety valve element for battery use comprises a metal substrate which is provided with a perforated opening and a metal foil laminated on the metal substrate so as to close the perforated opening. A battery which is provided with such a safety valve is also disclosed. A battery case provided with such a safety valve is also disclosed. The battery and the battery case lid is produced by forming the perforated opening in the metal substrate, pressure welding the metal foil to the metal substrate and molding the clad material into a form of the battery case lid.

The invention relates to a pressure load simulating system suitable for a deep-sea equipment hydraulic system and application thereof, and belongs to the technical field of marine equipment detecting.The system comprises a piston hydraulic cylinder, a three-position four-way switching valve, a working pressure meter, a working pressure transmitter, a rapid switching joint, a working pressure regulating valve, a controller, a filtering device, a first motor, a first hydraulic pump, a first one-way valve, an energy accumulator, an unloading valve, a throttle valve, an input pressure transmitter, an input pressure meter and a piston displacement sensor; the controller is electrically connected with the working pressure adjusting valve, the unloading valve, the input pressure transmitter, thepiston displacement sensor and the working pressure transmitter. The system can be applied to the detection of the deep-sea equipment hydraulic system and suitable for the load simulation of the deep-sea equipment hydraulic system which acquires power depending on volume variation, non-linear regulations of sea water pressure along with sea water depth can be simulated, and the simulation is closer to the real condition of the sea.

The invention provides a closed chamber typed heat exchanger, belonging to the heat energy exchange technical field. The closed chamber typed heat exchanger is characterized in that a hole plate is sealed with two ends and the circumference of a cylindrical shell which is horizontally arranged; a cold fluid heat exchange pipe bundle and a hot fluid heat exchange pipe bundle pass through the hole plate and are sealed to form a chamber body; the cold fluid heat exchange pipe bundle and the hot fluid heat exchange pipe bundle are respectively arranged in the upper space and the lower space of the chamber body; a vacuum-shaped closed chamber is filled with working media; the internal chambers of the cold fluid heat exchange pipe bundle and the hot fluid heat exchange pipe bundle are communicated with a cover with a connecting pipe at two ends so as to respectively form an independent fluid passage; an installation supporter is welded externally below the cylindrical shell; the closed chamber of the cylindrical shell can be provided with a plurality of structural types such as single body, double bodies or three bodies; the closed chamber typed heat exchanger has the active effects that the heat exchanger is not a pipe shell typed heat exchanger in traditional meaning and has the advantages of simple structure, fast response, convenient heat control, high heat transmission efficiency and obvious energy-saving effect. The heat exchanger can be applied to heat transmission places with low, middle and high temperature, and is an extremely practical invention.

The invention provides a horomill hydraulic circuit with fast and smooth pressure-adding function. The hydraulic circuit comprises a high-pressure oil pump, an electromagnetic overflow valve, hydraulic control check valves, a pressure transmitter II, an accumulator II and a difunctional hydraulic oil cylinder, wherein the high-pressure oil pump is connected with the two hydraulic control check valves through the electromagnetic overflow and a electromagnetic change-over valve; the fluid control check valve I and the hydraulic control check valve II are separately connected with the rod cavity and rodless cavity of the difunctional hydraulic oil cylinder; and a pressure-adding mechanism composed of a check valve, a pressure transmitter I, a two position two-way electromagnetic change-over valve and a accumulator I is arranged between the electromagnetic overflow valve and the electromagnetic change-over valve, the two position two-way electromagnetic change-over valve is also connected with the accumulator II and the rod cavity of the difunctional hydraulic oil cylinder, and the pressure-adding mechanism is used to supply the pressure for the rod cavity of the difunctional hydraulic oil cylinder and the accumulator II. The hydraulic circuit of the invention has reasonable design, simple structure and good fast and smooth pressure-adding function so as to ensure the smooth working pressure of the hydraulic circuit and increase the grinding efficiency and operational reliability of the horomill.

The invention relates to a nitrogen / chlorine (argon / chlorine) mixing and proportioning system and an operation method thereof, aiming to overcome the defect that the manual nitrogen / chlorine (argon / chlorine) mixing and proportioning process in the prior art is completed by manual operation rather than automatic operation and is low in proportioning precision and high in operation risk. The nitrogen / chlorine (argon / chlorine) mixing and proportioning system comprises nitrogen (argon) gas running equipment, chlorine gas running equipment, a nitrogen and chlorine (argon and chlorine) mixer, a mixed gas storage tank and a PLC (programmable logic controller) control cabinet, wherein tail ends of the nitrogen (argon) gas running equipment and the chlorine gas running equipment are connected with the nitrogen and chlorine (argon and chlorine) mixer together, the nitrogen and chlorine (argon and chlorine) mixer is further connected with the mixed gas storage tank for a feeding point, a pressure sensor is arranged on the mixed gas storage tank, the PLC control cabinet is connected with all the equipment, and intelligent management and operation is realized by an internal control and management system. The nitrogen / chlorine (argon / chlorine) mixing and proportioning system and the operation method thereof have the advantages that automatic proportioning operation can be realized, operators can keep away from dangerous sources, the proportioning precision is increased, the service life of the equipment is prolonged, the service pressure of the system is stabilized, and leakage caused by long-term overhigh pressure load for the end equipment is avoided.

The invention relates to a water production gas well full-life-circle drainage gas recovery method and system. The system comprises drainage gas recovery equipment, a gas-water shunting device, dryingequipment, a gas power generator and a compressor. A first branch of an outlet pipeline of the drainage gas recovery equipment is connected to an outer conveying pipe network. A second branch is connected with the gas-water shunting device. Gas flowing out of the top of the gas-water shunting device passes through an adjusting valve and is dried through the drying equipment, then the gas is divided into two branches, one branch flows into the gas power generator through a flow adjuster, the other branch flows into the compressor, and the gas power generator provides electric energy for the compressor by burning natural gas. The natural gas is pressurized through the compressor, multiple stages of pressure adjusters are started by the natural gas, shaft accumulated liquid is removed section by section, and continuous production of a gas well is guaranteed. The method and system can be suitable for water production gas well full-life-circle drainage gas recovery, one-time construction is effective for a long time, the gas lift starting pressure is low, the energy consumption is low, external electric energy does not need to be used, and the method and system are safe, reliable, capable of being reused, easy to manage and low in maintenance cost.

The invention discloses a smoke-absorption medical puncture device system. The system includes a puncture device, a controller, a pressure reducer and a gas supplying device, wherein the gas supplying device is connected to the input end of the pressure reducer, and the output end of the pressure reducer is connected to the gas input end of the controller; the gas output end of the controller is connected to the puncture device through a gas supplying pipe; the puncture device comprises a base and a puncture conduit, and the puncture conduit includes an outer sleeve, a middle sleeve and an inner sleeve; a gas extracting passage is formed between the outer sleeve and the inner sleeve, a gas returning passage is formed between the middle sleeve and the inner sleeve, and an instrument accessing passage is formed inside the inner sleeve; one end, positioned inside the base, of the middle sleeve penetrates through the outer sleeve, and one end, positioned inside the base, of the inner sleeve penetrates through the middle sleeve and the outer sleeve; a water removing device, a first smoke removing device, a water-proof draught fan and a second smoke removing device are successively arranged between the outer sleeve and the middle sleeve. The smoke-absorption medical puncture device system, by adopting a totally-enclosed smoke-removing structure with the three passages, greatly improves efficiency and quality of operations, and ensures safety of operation receivers.

The invention provides a hydraulic steering engine control system. The hydraulic steering engine control system comprises an oil cylinder, a three-position four-way solenoid directional valve, a check valve, a constant-pressure variable pump, a motor, a throttle valve and an oil tank. An oil inlet of the constant-pressure variable pump is connected with the oil tank. The motor is installed on the constant-pressure variable pump. An oil outlet of the constant-pressure variable pump is connected to an oil inlet of the check valve. An oil outlet of the check valve is connected with an oil port P of the three-position four-way solenoid directional valve, an oil port O of the three-position four-way solenoid directional valve is connected with the throttle valve, and the throttle valve is connected with the oil tank through an oil path. An oil port A of the three-position four-way solenoid directional valve is connected with a left cavity oil inlet of the oil cylinder. An oil port B of the three-position four-way solenoid directional valve is connected to a right cavity oil inlet of the oil cylinder. The oil returning throttling speed-adjusting loop is adopted, the steering speed is better controlled to enable a steering engine to work stably, and the hydraulic steering engine control system is simpler, more convenient to manage and suitable for small ships.

The present invention relates to a comprehensive test device and method of the underground efficient irrigation system irrigator performance. The comprehensive test device comprises a water source of which the outlet end is connected with a water pump, the water in the water source is pumped by the water pump and then flows into a filter via a water outlet pipe to be filtered, and then a part of water back flows to the water source via a first backflow pipeline, and the other part of water enters the inlet ends of the parallelly arranged tubular billets via a water supply branch pipe. The outlet ends of the tubular billets are connected with the inlet end of the water source via a second backflow pipeline to enable the water to back flow to the water source, a test unit is arranged at the tail end of each tubular billet, and the tubular billets are connected with the second backflow pipeline via the test units. The water outlet pipe located between the water pump and the filter is also equipped with a first valve, a second pressure regulation valve is arranged on the first backflow pipeline, and a diverter valve is arranged on the backflow pipeline. A pressure fine tuning valve and a pressure gauge are arranged on the water supply branch pipe close to the inlet ends of the parallelly arranged tubular billets. According to the present invention, the phenomena, such as the crop root invasion blocking, the negative pressure mud-suction blocking, etc., can be expressed very well.

The invention relates to a neutron tube with a drive-in target, which relates to an ion beam tube. The neutron tube with a drive-in target disclosed by the invention is composed of an ion source, an accelerating system and a deuterium-tritium reservoir. The neutron tube with a drive-in target disclosed by the invention has the following advantages that (1) the service life is long. When the neutron tube is running, the consumed tritium energy in the target is timely compensated, and the target is always kept in a saturation state, once an enough deuterium-tritium gas mixture is distributed in the deuterium-tritium reservoir of the tube, enough deuterium and tritium are distributed in the target, so that continuous and stable neutrons are generated; (2) the operating temperature is high. The thorough gas removal of components in the tube is ensured, so that a situation that the target has a s good heat dissipation effect is ensured, and even if the target is running in an environment at a temperature of 175 DEG C, no mixed gas is released from the inside of the tube, and no deuterium-tritium gas is released from the inside of the target; and (3) the stability is good. In the process of running, the deuterium-tritium content in the target is automatically compensated and kept constant, thereby ensuring the stable neutron output; and because the deuterium-tritium reservoir with a large inspiratory capacity and a high inspiratory flow rate is adopted, the stability of air pressure in the tube is ensured, and the stability of electric parameters is also ensured.

The invention discloses a portable water mist fire extinguisher, which comprises a nozzle (1), a switching valve (2), a pressure reducing valve (3), a shell (4) and a straw (5). The switching valve (2) is arranged at an opening on the upper part of the shell (4); the pressure reducing valve (3) is arranged on the switching valve (2); the nozzle (1) is connected with the pressure reducing valve (3); one end of the straw (5) is connected with the switching valve (2), and the other end of the straw (5) penetrates into the shell (4); and water in the shell (4) passes through the straw (5) and the switching valve (2) and enters the pressure reducing valve (3), and pressure water subjected to pressure reduction by the pressure reducing valve (3) flows out of the nozzle (1) to form water mist. The portable water mist fire extinguisher can effectively extinguish various types of fire, and has high environment compatibility, constant working pressure, high fire extinguishing efficiency, light weight and small volume.

The invention relates to a flexible jack based on the pneumatic technology, and belongs to the technical field of mechanical engineering. The flexible jack based on the pneumatic technology comprises a jacking cylinder, a foot cylinder, a pedal and a connecting pipeline. By treading the pedal, the foot cylinder can fill air into the jacking cylinder to drive the jacking cylinder to ascend. By loosening the pedal, the pedal cylinder is reset and sucks air. The jacking cylinder exhausts the air, so that a heavy object is laid down or the jacking cylinder is reset. The flexible jack based on the pneumatic technology has the advantages of being scientific in design, convenient to use, stable to work, lasting and capable of achieving pressure maintaining, portable to carry, environmentally friendly, capable of being widely applied to the fields of heavy object jacking and squeezing, and the like.

An electric control gas injection valve for an engine comprises a valve shell, a gas outlet valve element assembly and an upper cover assembly. An inner cavity of the valve shell is divided into a gas inlet chamber, a gas high-pressure work chamber and a gas low-pressure gas outlet chamber. The gas outlet valve element assembly comprises a motion disc, a gas outlet valve element and a gasket. The upper cover assembly comprises an upper cover, an electromagnetic valve, a stop bushing and a spring. The valve opening function is achieved in the manner of driving an armature through the high-speed strong electromagnetic valve. When the electromagnetic valve is powered on, a motion disc assembly bears strong electromagnetic force and lifts rapidly, and the valve is opened to provide gas for the engine. When the electromagnetic valve is powered off, the motion disc assembly rapidly falls back under the action of pre-tightening force of the spring, and the sealing effect is good by combining the pressure difference generated by high-pressure gas on a boss.

The invention discloses a protective gas preheating method and a device for 3D printing. The device comprises a protective cover, and a vacuum preheating cavity arranged in the protective cover; two gas heating channels with the same structure are arranged in the vacuum preheating cavity; gas enters the gas heating channels from an intake port for heating to enter the vacuum preheating cavity, and enters a molding chamber from an exhaust port; and each gas heating channel is divided into two sub channels for gradient heating. The structure increases paths of inert gas entering the vacuum preheating cavity, and uses a gradient heating method for enabling the heated inert gas to be more stable, so that the temperature difference of a laser scanning area and the gas in the molding chamber is reduced; and meanwhile, the secondarily heated inert gas can continuously preheat metal powder on inner surface layers of a molding cylinder and a powder cylinder, so that the temperature difference in the layers and between the layers is largely reduced, the thermal stress is reduced, and the residual stress and deformation in the SLM molding process are reduced.

The invention discloses a thermochemical heat exchanger circulatory system based on the re-absorption technology, belonging to the waste heat utilization technology field, wherein, an outlet of a high temperature reactor is connected with an inlet of a middle regulating valve, the outlet of the middle regulating valve is connected with the inlet of a low temperature reactor, the outlet of the low temperature reactor is connected with the inlet of a low temperature regulating valve, the outlet of the low temperature regulating valve is connected with the inlet of a condenser, the outlet of the condenser is connected with the inlet of a high temperature regulating valve, and the outlet of the high temperature regulating valve is connected with the high temperature reactor. A high temperature reaction chemical absorbent is filled in the high temperature reactor, a low temperature reaction chemical absorbent is filled in the low temperature reactor, the low-grade waste heat input process and the high-grade temperature output process are realized by utilizing the single variable absorption characteristics of the chemical absorbents of the different reaction temperature zones; the thermochemical heat exchanger circulatory system can greatly reduce the fluctuation of the working pressure of a heat exchanger system, and greatly ensure the stability of the working pressure of the system, thus ensuring the good temperature increase capability of the heat exchanger system.

The invention discloses an eccentric sleeve of a cycloidal inner-outer rotor pump, which is mainly provided with a non-axial expansion clearance between an the eccentric sleeve and a chamber of the pump, the eccentric sleeve is provided with a retaining nest, an unloading steel pit, a through hole for penetrating loading, a spring steel sheet with a pointed nose is placed in the unloading steel pit, and the spring steel sheet is arranged between the eccentric sleeve and an end closure of a shell of the pump, so the eccentric sleeve has elastic effect to a higher pair contacts between an internal rotor and an external rotor, thereby the invention not only automatically compensates the axial clearance between the internal rotor and the external rotor, but also reduces friction, improves the volumetric efficiency of the pump, prolongs the service life of the pump, stabilizes the operating pressure of the pump, and suppresses axially running noise when the pump operating; the invention guarantees that the pump has the capability of excellent operation for positive and negative rotation, maintains the capability of unloading and increases the function of sealing.

The invention discloses spraying equipment. The spraying equipment comprises a sealed coating box which is used for containing coating and a spraying gun for spraying the coating, and further comprises a sealed pressure box and a variable air pump; the coating box is provided with an air pump connector and a material supplying hole; the pressure box is provided with a feeding hole and a discharging hole; the variable air pump is communicated with an air pump connector; the feeding hole is communicated with the material supplying hole; the discharging hole is communicated with the spraying gun; the variable air pump can drive the coating to enter the pressure box 3 and the coating is sprayed out through the spraying gun 2; the spraying equipment further comprises a controller and a pressure sensor arranged in the pressure box; the controller can be used for controlling starting and stopping and a rotary speed of the variable air pump according to pressure detected by the pressure sensor. The controller is used for controlling the starting and stopping and the rotary speed of the variable air pump according to the real-time pressure, and online adjustment of a spraying flow of the spraying equipment is realized in real time; the responding speed is relatively rapid; meanwhile, the pressure is detected in real time so that working pressure is stable and the spraying is more uniform. Gas-liquid control separation is realized, explosion is prevented and the safety is improved.

The invention belongs to the field of flue gas denitration in the cement industry, in particular to an SNCR system of a same-pass cement kiln. The SNCR system of the same-stroke cement kiln comprisesa reducing agent storage tank, a spray gun, a compressed air tank and a same-pass pipe, wherein the reducing agent storage tank is connected with the spray gun through a pipeline A, a pump, a valve Aand a flow meter are arranged on the pipeline A, the compressed air tank is connected with the spray gun through a pipeline B, a valve B is arranged on the pipeline B, and the pipeline length and thenumber of elbows of the pipeline A and the pipeline B are the same by arranging a same-way pipe. According to the SNCR system of the same-stroke cement kiln, the total resistance loss is the same, theworking pressure of each spray gun is the same, the flow distribution of a reducing agent is uniform, and the atomization state is the same.

This invention provides a mixed transportation overflow valve consisting of valve body, valve seat, valve core and gas holder. The valve core includes a valve shaft and a valve core sleeve that are fixed together at the lower parts; The lower flange of the valve seat is connected to the valve body and the upper flange is connected to the bottom of the gasholder through the gasholder bracket; a downwards extending linear bearing sleeve at the middle of the valve seat covers the valve stem by a linear bearing, the valve core sleeve is around the bearing sleeve and is surrounded by the sealing diaphragm, the upper end of the diaphragm is fixed between the valve body and the flange face of the valve seat. The upper and lower sealing pairs is set at the corresponding positions between the lower part of the valve core sleeve and the internal channel in the valve body. The gasbag is clung to the upper end of the valve stem via gasbag pallet; its upper end is fixed between the gasholder bracket and the gasholder. The drain pipe is set at the lower part of the gas holder bracket. This invention can ensure the stability of working pressure and enhance the efficiency.

A finned radiator comprises radiating fins (10), an air inlet pipe (30), a liquid return pipe (100) and an air storage box. A diaphragm (80) or a baffle plate divides the internal space of the air storage box into upper and lower parts, and the air storage space (38) at the lower part is mutually communicated with the internal space of the radiating fins (10) and the liquid return pipe (100). Steam of a cooling medium enters the air storage space (38) through the air inlet pipe (30), then flows into each radiating fin (10) for the heat exchange with external air and turns back to liquid by condensation, and the liquid flows into the liquid return pipe (100) along the inner walls of the radiating fins (10) and flows out by a liquid return flange (110). A valve (70) at the top part of the air storage box is opened, the space above the diaphragm (80) is communicated with atmosphere, and the diaphragm (80) is correspondingly upwards convex or downwards concave along with the pressure of the steam in the air storage space (38), thereby maintaining the internal pressure of the air storage space (38) to be constant at one atmosphere pressure. The finned radiator stabilizes the internal working pressure thereof, and the cooling medium cycles naturally without the noise.

This invention provides a rolling type end face sealing diaphragm, which is disc shaped. Its inner side face has ring shaped circular projection. Its outer side face has flange. This invention can ensures the moving part of hydraulic pressure, pneumatic equipment not interfere by the additional axial force generated from the connection of diaphragm and cylinder body. It works steadily. Thus, it increases technical indicators and producing efficiency. This invention can be used to general working flow.

The invention relates to a device and a method for preparing a non-polar indium nitride nanocrystalline thin film, and belongs to the field of group III nitride optoelectronics. The device comprises areaction cavity, a substrate sample table, a beam source furnace, a radio frequency electrode, a vacuum mechanical pump, a molecular pump and a nitrogen supply system. The method comprises the following steps: cleaning a substrate and carrying out air drying, placing raw materials and the device according to requirements; carrying out vacuumizing, heating the sample table to 450-650 DEG C, and carrying out anneal for 10-30 minutes; closing the molecular pump, introducing 5-10sccm of nitrogen gas, and controlling the nitrogen pressure of the reaction cavity to be 25-50Pa; controlling the radiofrequency power to be 120-200W, and carrying out glow cleaning on the substrate; heating the beam source furnace to 700-800 DEG C, opening a metal baffle plate, maintaining the nitrogen flow rate, the nitrogen pressure of the reaction cavity and the radio frequency power unchanged, and carrying out a reaction for 3-5 hours; and closing the device, so as to obtain the non-polar indium nitride nanocrystalline thin film. The process method has the simple raw materials, low cost, and no catalyst or template, and the growth on a large-size substrate is facilitated.

The invention discloses a constant pressure air feeding control method for a multistage centrifugal air compressor. The method comprises the following steps: 1, combining performance simulation and experimental data to obtain a compressor performance curve according to design parameters; 2, determining an unloading pressure value and a reloading pressure value, and combining the first step to determine a surge area, a guide vane regulating area and a vent valve regulating area; 3, arranging P setting and dead zone range during normal operation, and generating a regulating signal; 4, entering a full constant pressure control regulating mode if Pcurrent is more than Preloading and less than Punloading, and entering a step 5; entering a forced unloading mode and entering a step 6 if Pcurrent is more than Punloading; entering a reloading mode and entering a step 7 if Pcurrent is less than Preloading; 5, determining a regulating interval, determining a PID (Proportion Integration Differentiation) regulating parameter, and regulating the pressure value through PID; 6, totally opening the vent valve, regulating IGV (Inlet Guide Vane) opening to enable Icurrent to be equal to Imin, and entering a full constant pressure regulating mode; and 7, regulating the IGV opening to enable Icurrent to be equal to Imin, totally opening the vent valve, regulating the IGV opening again to enable Icurrent to be equal to Imin, and entering the full constant pressure regulating mode.

The invention discloses a four-tower distillation and membrane separation integrated system, which comprises a mash liquid pre-heater, a negative pressure mash tower, a normal pressure mash tower, a medium pressure rectification tower and a high pressure rectification tower, wherein the high pressure rectification tower is sequentially connected to an alcohol gas overheating device and a membraneseparation device through pipelines, the membrane separation device comprises a low vacuum membrane assembly and a high vacuum membrane assembly, and the low vacuum membrane assembly and the high vacuum membrane assembly are connected in series. The method for distilling ethanol by using the system comprises that A, gas is removed from fermented mature mash to form degassed mash; B, the alcohol vapor is separated from the waste mash liquid in the degassed mash; C, the alcohol vapor is condensed to form a crude alcohol, the crude alcohol is distilled by the medium pressure rectification tower,and the obtained material enters the high pressure rectification tower; and D, the alcohol vapor entering the high pressure rectification tower is partially overheated, and the obtained material sequentially enters the low vacuum membrane assembly and the high vacuum membrane assembly to separate the ethanol and the water. According to the present invention, with the system and the method, the phenomenon of alcohol volatilization in the distillation process can be avoided, the consumption of freezing water and steam can be reduced, and the system and the method are energy-saving and environmentally friendly.