44results about How to "Reduce inspiratory volume" patented technology

The present invention relates to a superplastic forming method for the titanium plate specially used for the plate type heat exchanger, which belongs to the field of mechanical processing technology. The present invention comprises the following steps that spongy titanium is chosen to be the melted raw material; the spongy titanium is placed in a vacuum plasma smelting furnace to be directly cast into plate base; the plate base forms a plate of a thickness of 2.0 to 2.4 mm after the process of heating, hot rolling, acid and alkali washing; second heating, hot rolling and acid and alkali washing and annealing; the plate of a thickness of 2.0 to 2.4 mm after the annealing in the vacuum smelting furnace forms a titanium plate of a thickness of 0.5 to 0.6 mm after the process of cold rolling, cleaning, second annealing and cold rolling, acid and alkali washing and third annealing. The present invention adopts the process that the spongy titanium which contains oxygen, iron and nitrogen of comparatively high content is directly processed into the titanium plate base in the plasma smelting furnace and directly rolled into the plate without forging and pressing.

The invention belongs to the field of fire flooding process, in particular relating to a layered electric ignition method for multilayer gas injection of fire flood, comprising the following steps: (1) placing a gas injection tubular column in a fire flooding gas-injection well; (2) continuously injecting air into the gas injection tubular column; (3) determining a main gas-entry layer by means of a main gas-entry profile; (4) heating the air until the temperature of the air is above 450 DEG C, and ensuring the contents of the oxygen in tail gases of surrounding production wells to be less than or equal to 2%; (5) injecting high-temperature foams into the fire flooding gas-injection well, and when pressure increases 1-4Mpa, determining the main gas-entry layer by the means of the main gas-entry profile; (6) increasing the air injection amount by 30%, electrifying to heat the injected air until the temperature of the injected air is above 450 DEG C, and ensuring the contents of the oxygen in the tail gases of the surrounding production wells to be less than or equal to 2%; and (7) continuing to inject the high-temperature foams, ensuring the air injection intensity, and determiningthe main gas-entry layer by means of the main gas-entry profile when the pressure increases, as well as detecting the compositions in the tail gases of the surrounding production wells. According to the invention, the fire flood is utilized to realize multilayer combustion, multilayer effectiveness and high mining efficiency.

The invention discloses an explosion-proof ventilation device for underground engineering. The explosion-proof ventilation device for the underground engineering comprises a ventilation pipe and a fanmounted inside the ventilation pipe, the inner wall of the ventilation pipe is fixedly provided with an adjustment device for adjusting the rotation speed of the fan, a treatment box is fixed on theinner wall of the ventilation pipe, the side wall of the treatment box is provided with a ventilation groove in a penetrating mode, an L-shaped connecting rod is fixed on the inner wall of the ventilation groove, a rotating shaft is rotationally connected to the side wall of the connecting rod, and a plurality of rotating plates are fixed to the circumferential side wall of the rotating shaft. Theexplosion-proof ventilation device has the advantages that when the concentration of mashgas of an underground passage is relatively high, and air input by an air outlet pipe is not enough to reducethe concentration of the mashgas, a detector can emit an acousto-optic alarm, the emitted sound can be used for prompting a worker for prevention, the emitted flash can reduce the value of resistanceof a photoresistor, so that the attraction force of an electromagnet to an electricity connecting piece is increased, then the rotation speed of the fan is reduced, the air suction amount per unit time is reduced, then the concentration of the mashgas in the ventilation pipe is reduced, and explosion is avoided.

The invention discloses a low-pressure filling method and device using electromagnetic stirring technology. The device includes a crucible furnace and a riser tube. The crucible furnace is provided with a furnace cover, so that the inside of the crucible furnace forms a sealed cavity. The top of the sealed cavity is communicated to the bottom of the cavity to be filled through a riser tube. An electromagnetic stirrer is provided beside the riser tube, and the crucible furnace has a pressurized gas inlet. Pressure is applied to metal melt in the crucible furnace to make the metal melt rise through the riser. Under the filling pressure, the metal melt enters the cavity smoothly until the entire cavity is completely filled. The temperature of the metal melt passing through the riser is 30 to60% of the liquidus temperature of the metal or alloy plus the width of its solidification temperature interval; As the metal melt flows through the riser, the metal melt is electromagnetically stirred. The device disclosed in the invention uses electromagnetic stirring to break up the generated dendrites, new crystal nuclei are added, the grain structure is refined, the pouring temperature is lowered, the mechanical properties of the casting can be improved, air intake and shrinkage of the casting can be reduced, and the casting quality and metal utilization rate can be improved.

A ventilation system and method with a ventilating tube, a stylet removably disposed within the ventilating tube, and a proximal housing. A proximal housing includes a proximal end that connects to the ventilating tube, a distal end that connects to a ventilating machine, a lumen between the proximal end and distal end, an external wall between the proximal end and distal end, a filter contained within the external wall, surrounding the lumen, and connecting the proximal end and distal end, and a cavity between the filter and the external wall. A proximal housing contains at least one detection element and can be sensitive to carbon dioxide. The same proximal housing contains at least one treatment element to heat, cool, humidify, dehumidify, or provide medication to the lumen of the proximal housing.

The invention discloses a three-section type screw rotor and a twin-screw vacuum pump comprising the same and belongs to the field of dry twin-screw vacuum pumps. The screw rotor comprises a gas suction section, a compression section and a gas exhaust section, wherein section profile lines of the gas suction section, the compression section and the gas exhaust section change continuously with a spiral expansion angle; the gas suction section and the gas exhaust section have profile lines with the equal pitch and equal sections, the pitch of the gas suction section is larger than that of the gas exhaust section, but the tooth top surface width of the gas suction section is smaller than that of the gas exhaust section; transition from the gas suction section to the gas exhaust section is realized by the aid of the compression section; the compression section has the profile line with the varying pitch and varying section; and tooth surfaces and spiral lines between the gas suction section and the compression section and between the compression section and the gas exhaust section are in smooth transition. The screw rotor can form the relatively large gas suction volume and the relatively small gas exhaust volume within a relatively small axial size, and the inner volume ratio and the sealing performance of the screw rotor are increased; thus, the screw rotor has the advantages of large inner volume ratio, good sealing performance, compact structure, small axial size and low machining difficulty, and the final vacuum and the pumping speed of the twin-screw vacuum pump are increased.

The invention relates to a pulmonary fibrosis animal model building method. The method comprises the step that a pulmonary fibrosis animal model is prepared by dripping a PM2.5 suspension into a nasalcavity. The method has the advantages that a mouse pulmonary fibrosis model is built through PM2.5 nasal cavity dripping for the first time, the feasibility is verified through experiments, and by means of PM2.5 nasal cavity dripping for eight consecutive weeks, mouse pulmonary fibrosis can be induced. According to the pulmonary fibrosis animal model building method, bleomycin is not used, an airpipe is not used for dripping, operation is easy and convenient, and the trauma is small.

The invention provides an injection supercharging cascade supercooling injection throttling transcritical CO2 system and application. The system comprises a CO2 low-temperature-level evaporator and acommon working medium-temperature-level compressor, wherein an outlet of the CO2 low-temperature-level evaporator sequentially communicates with an inlet of a secondary flow of a CO2 injector, a heating medium side of the CO2 medium-temperature-level evaporator, the CO2 compressor, a heating medium side of a CO2 gas cooler, a heating medium side of a medium-temperature-level cooling evaporator andan inlet of a heating medium side of a low-temperature-level cooling evaporator; an outlet of the heating medium side of the low-temperature-level cooling evaporator is divided into two paths to communicate with a main flow inlet of the CO2 injector and an inlet of the CO2 low-temperature-level evaporator; and an outlet of the common working medium-temperature-level compressor sequentially communicates with a heating medium side of a condenser and a main flow inlet of a common working medium injector. According to the injection supercharging cascade supercooling injection throttling transcritical CO2 system, power consumption can be reduced, irreversible throttling losses can be reduced, and the system energy efficiency can be improved.

The invention discloses a multistage compression multi-condenser intermediate complete cooling heat pump drying system which is composed of an evaporator, an air cooler, multiple stages of compressors, multiple stages of condensers, multiple stages of throttling valves and multiple stages of gas coolers. Materials are dewatered and dried according to technological requirements by arranging different numbers of stages, air is repeatedly continuously heated through multi-stage compression and multi-stage variable temperature condensation processes of working media, and irreversible loss caused by heat exchange between air and working media in the heating process can be remarkably reduced. The compression ratios of the multiple stages of compressors are small, non-azeotropic mixed working media with reasonable temperature slip can be adopted, the working media and air form good temperature matching, the heat transfer temperature difference can be further reduced, heat transfer irreversible loss of the condensers and the evaporator is reduced, and system energy efficiency is improved.

The invention provides an interstage pressure regulating structure of a two-stage screw air compressor. The structure can change the inter-stage pressure (also referred to as the exhaust pressure of afirst-stage main machine) by adjusting the air suction quantity of a second-stage main machine, thereby improving the load of a first-stage main machine rotor, thereby eliminating the noise and vibration generated by the first-stage main machine under the unloading condition. The first-stage main machine, the second-stage main machine and an oil distributing barrel are arranged along the air flowdirection, the first-stage main machine rotor and the second-stage main machine rotor are connected through a connecting structure, a second-stage main machine compression cavity and a second-stage main machine air suction cavity are in communication through a bypass flow channel, a valve plate is pressed by a return connection port of the bypass flow channel and the second-stage main machine compression cavity, and the valve plate is mounted on a mobile structure.

The invention discloses a cylinder assembly. The cylinder assembly comprises a cylinder body, wherein an air suction channel is arranged on the cylinder body, a valve cavity is formed in the inner wall of the air suction channel, a valve is arranged in the valve cavity in a reciprocating motion manner, the movement direction of the valve is perpendicular to the axial direction of the air suction channel, and a driving device capable of driving the valve to extend into the air suction channel is arranged in the valve cavity. The running load of the compressor can be effectively reduced through the cylinder assembly under the conditions of large exhaust pressure and large pressure difference of suction and exhaust pressure. The invention further discloses a compressor applying the cylinder assembly.

The invention relates to the technical field of vacuum pumps, and discloses a cooling mechanism of a water ring vacuum pump. The cooling mechanism comprises a shell; an air suction port is arranged above the middle part of one side of the shell; an exhaust port is arranged below the middle part of one side of the shell; a medium is stored on the bottom surface of an inner cavity of the shell; and a driving wheel is movably connected below the middle part of the inner cavity of the shell. Through the arrangement of an internal cooling mechanism, when a beating trash removal mechanism works normally and a piston rod is rapidly thrown out under the action of centrifugal force, air to be exhausted is sucked into a refrigeration cavity through a vent hole, and the air suction amount in the refrigeration cavity is small under the effect that the opening range is small when the vent hole sucks air; and under the effect that the outward moving amplitude of the piston rod is large, air in the refrigeration cavity expands under the effect of negative pressure and absorbs a small amount of heat, so that when the water ring vacuum pump works normally, the refrigeration cavity continuously absorbs a small amount of heat, and the inner cavity of the water ring vacuum pump is continuously subjected to heat absorption and cooling.

The invention discloses a coating for a metal mold casting of magnesium alloy thin-wall parts, wherein the coating consists of following components, by weight percent, 1.5 to 2.5% of diatomaceous earth, 2 to 3% of magnesia powder, 1.2 to 1.8% of titanium dioxide powder, 1 to 2% of zircon powder, 1.5 to 2.5% of bentonite, 2 to 4% of asbestos powder, 1.2 to 1.4% of silica sol and the balance of alcohol.