649results about How to "Stable air pressure" patented technology

The invention discloses a foldable coaxial double-rotor aircraft and a control method thereof. The foldable coaxial double-rotor aircraft comprises an aircraft body, a rotor system mounting base, an upper rotor action motor, a lower rotor actuation motor, an actuation motor connecting part, a foldable upper rotor part, a foldable lower rotor part, an upper rotor variable-pitch mechanism, a lower rotor variable-pitch mechanism, foldable landing gears and airborne equipment. The foldable coaxial double-rotor aircraft is characterized in that the aircraft body is in a column shape, and the outside surface is provided with a groove along the bus direction towards the interior of the aircraft body; the foldable upper rotor, the foldable lower rotor and the foldable landing gears are respectively folded into the groove along the bus direction of the aircraft body through self root hinges; the upper rotor variable-pitch mechanism and the lower rotor variable-pitch mechanism are used for independently completing the variable-pitch operation. By adopting the foldable coaxial double-rotor layout plan, the foldable coaxial double-rotor aircraft has the advantages that by extending and accommodating the foldable double rotors and the foldable landing gears, the aircraft can complete flight operation in a normal coaxial rotor state under the working condition; under the non-working condition, the size is smaller, and the manufacturing, transportation, carrying and storage are convenient.

The invention discloses a device and method for stabilizing air pressure in a sealed molding chamber for 3D printing of metal. The device mainly comprises an oxygen content detecting device for detecting the content of oxygen in the molding chamber, a vacuumizing device for the molding chamber and a pressure sensing device for detecting air pressure in the molding chamber; and the oxygen content detecting device, the vacuumizing device and the pressure sensing device are controlled by the control device, and a way of simultaneously introducing inert gases into the molding chamber and vacuumizing is adopted, so that the content of oxygen in the molding chamber is kept to be reduced, and the air pressure is kept stable. Therefore, the stability and quality of an equipment molding process can be greatly improved, and the safety and reliability of a processing course can be ensured. The device and technical means of the method are simple, convenient and easy; the molding chamber works at positive pressure, so that oxygen in the atmosphere can be kept difficult to enter the sealed molding chamber; in addition, dust cannot be easily raised in the 3D printing process of the metal.

The invention discloses a method for diagnosing air leakage of a vacuum air suction system for providing vacuum degree of a brake system. The method comprises the following steps of 1, opening a vacuum pump to suck air out of a vacuum tank; 2, simultaneously meeting the following three diagnosis conditions, namely that (1) the air in the vacuum tank is only exhausted through the vacuum pump; (2) a brake pedal is not treaded; (3) the working state of a pressure sensor for detecting the air pressure in the vacuum tank is normal; 3, respectively measuring the air pressure in the vacuum tank by the pressure sensor at a time point t1 and a time point 2 within the time range when the three diagnosis conditions are simultaneously met, and calculating the difference value of the air pressure at a time point t1 and the air pressure at a time point 2; according to a formula shown in the attached figure, calculating a diagnosis threshold value from the time point 1 to the time point 2; when the difference value of air pressure is smaller than the diagnosis threshold value, judging that the air leakage fault occurs; when the difference value of air pressure is not smaller than the diagnosis threshold value, judging that the air leakage fault does not occur. The method has the advantage that the more accurate diagnosis results can be obtained.

The invention relates to a pressure wave protection system applied to a high-speed train, comprising pressure wave air doors, a pressure wave sensor assembly and a pressure wave controller, wherein the pressure wave air doors are respectively arranged on the air inlet and the air outlet of the air-conditioning system of each compartment of a train, and the pressure wave sensor assembly and the pressure wave controller are installed in a cab; the pressure wave sensor assembly is electrically connected with the pressure wave controller; the pressure wave sensor comprises pressure tappings arranged on the inner side and the outer side of the compartment; monitored inner and outer pressure difference parameters are instantly transmitted to the pressure wave controller via the pressure tappings in the form of current signals; the pressure wave controller is provided with a microprocessor comprising a data comparison processing module; the pressure wave controller is electrically connected with each pressure wave air door and sends current signals for opening and closing the air door. High-speed trains can quickly reply the sudden change of compartment inner and outer pressure difference by the pressure wave protection system, maintains stable air pressure in the compartment and greatly controls pressure fluctuation in the train, thus ensuring the riding comfort level of passengers.

The present invention provides a thermal management system and a thermal management method for a high-altitude unmanned aerial vehicle fuel cell module, and belongs to the field of aviation spacecraftenergy source systems. According to the present invention, the high-altitude unmanned aerial vehicle fuel cell module comprises a fuel cell reactor, an oxygen supply system and a hydrogen supply system, the thermal management system comprises a heat exchanger and a heat dissipation system, one part of the waste heat generated by the fuel cell reactor heats hydrogen and oxygen through the heat exchanger, the other part of the waste heat generated by the fuel cell reactor heats the environmental space at which the fuel cell reactor is positioned, the fuel cell reactor is an air-cooled fuel cellreactor or a liquid-cooled fuel cell reactor, and the air-cooled fuel cell reactor comprises a closed air-cooled fuel cell reactor and an open air-cooled fuel cell reactor.

The invention discloses a volume variable additional air chamber of air spring. The outer part of the volume variable additional air chamber is a cylindrical air storage barrel, the inner cavity of the air storage barrel is circumferentially divided into eight equal sector cylindrical cells by the same partition boards, one side of each partition board is fixed on the inner wall of the air storage barrel, and the other side of each partition board stretches towards the center of the air storage barrel to form a closed cylindrical empty cavity tightly matched with a piston; the top end of the piston stretches out of the air storage barrel and is connected with a stepping motor through a screw rod; an altitude sensor is fixedly arranged on the top end face of the piston; the lower part of the air storage barrel is a lower sealing cover board, and a lower closed empty cavity is formed from the air storage barrel, the piston and the lower sealing cover board; a connecting hole communicated with a main air chamber is arranged in the center of the lower sealing cover board; and eight small holes communicated with the eight sector cylindrical cells in sequence are arranged on the side wall face of the cylindrical empty cavity, and the eight small holes are axially distributed along the cylindrical empty cavity from bottom to top in equal altitude difference. The volume of the additional air chamber can be rapidly changed so as to stabilize the air pressure of the main additional air chamber.

The invention discloses a liquid flow standard calibration device. The device adopts an overflow structure in a closed container to obtain stable liquid level on which stable high air pressure acts to enable a fluid source of the device to have the advantages of flow stability of a water tower and high Reynolds number of container pressure stabilizing method and to have less fabrication cost and occupied area than those of the water tower method; the device does not need a reverser, and avoids the error caused by unsymmetrical double direction switching process of the reverser; during the calibration, the opening and closing of a valve are not taken as the starting point and terminal point of timing, liquid flowing stays in stable state within timing section, and calibration error mainly depends on the measurement error of the volume or weight of liquid in a standard measuring container, therefore, compared with the calibration device using the reverser, the liquid flow standard calibration device has higher calibration precision.

The invention discloses an environmental chamber for a multi-parameter composite test, comprising an airtight case which is connected with a case cover in a sealing mode, wherein the case and the case cover both comprise an outer layer made of metal to ensure the rigidity of the case and an insulation layer made of metal to maintain the internal temperature of a composite cavity, the inner cavity of the case forms an environmental composite cavity independent to the external; the composite cavity is successively provided with a noise generation mechanism fixed on the upper part of the composite cavity, a temperature control mechanism fixed on the wall of the composite cavity, a vibration generation mechanism, an air intake and an exhaust port from top to down, wherein the vibration generation mechanism is arranged in the composite cavity and is in linkage with an external vibration source, the air intake is connected with an air pump and used for introducing air into the composite cavity to form a pressure filed, and the exhaust port is connected with a vacuum generator in a sealing mode. The invention has the advantages of being capable of fully stimulating the working environment of parts and having good test result and high accuracy.

The invention relates to separate zinc from bismuth liquid and distill zinc from silver zinc dregs after taking refining zincification desilverization process. It puts the bismuth liquid into vacuum container and whisking, making zinc vaporize from bismuth liquid to gain zinc vapor. Vacuuming to make the vapor rise to condensing apparatus to condense to solid and adhere at condensing apparatus and gathering. Inducing the tail gas into purification device to take purifying and discharge. The method to distill zinc from silver zinc dregs is almost the same, and adds the process of melting silver zinc dregs. The device includes bismuth fine furnace, vacuum container, condensing device, whisking device, subsidence purifying device and vacuum pump. The invention could lower zinc consumption, and good economic benefit and avoid pollution of toxic gas and chlorine alkali dregs.

The invention discloses a closed pulse dust collector and a dust collection method thereof. The closed pulse dust collector comprises a dust collector housing (3), wherein dust collection filter elements (2) are arranged in the dust collector housing (3). The closed pulse dust collector is characterized in that a sealed chamber cover (6) is arranged at the tops of the dust collection filter elements (2); the dust collection filter elements (2) are connected with the sealed chamber cover (6); an air outlet (7) is formed at the top of the sealed chamber cover (6); a valve plate (12) controlling the opening and closing of the air outlet (7) is arranged at the air outlet (7); and an air ejection pipe (14) connected with a pulse pneumatic valve (13) is arranged at the side part of the sealed chamber cover (6). According to the invention, the air outlet is closed automatically under the control of a power supply control box; an opposite sealed chamber is formed by the sealed chamber cover and the dust collector filter elements; air ejected by the air ejection pipe forms a pressure air mass to act on the dust collection filter elements, so that a dust collection effect is improved by above 20% compared with the prior art.

The invention discloses a data center liquid cooling system and relates to the technical field of data center heat dissipation devices. The system comprises a box body, a server, a cold plate, a cooling device, a liquid storage tank and a refrigerant pump. The box body is filled with a single-phase refrigerant, the server is immersed in the single-phase refrigerant, the server is connected to thebox body, the cold plate is arranged in the box body and is connected to the box body, and the cold plate is sequentially connected to the cooling device, the liquid storage tank and the refrigerant pump to form a circulation loop. The invention realizes the combination of indirect contact liquid cooling, single-phase direct immersion liquid cooling and natural cooling, so that the single-phase refrigerant does not need to be circulated under the driving of a pump but is circulated by the change of temperature and density, although the refrigerant is circulated under the driving of the refrigerant pump, the refrigerant has a smaller viscosity than that of the single-phase refrigerant and is easy to flow, the loss of the refrigerant pump is not increased, so the pump loss caused by the single-phase refrigerant is reduced, the PUE of a data center is lowered, and the greenness of the data center is improved.

The invention relates to the technical field of battery pack heat dissipation, and discloses a battery pack heat dissipating device. The battery pack heat dissipating device comprises a box, wherein abattery pack is arranged in the box, a gas discharging pipeline is arranged on the box, the gas discharging pipeline and the interior of the box are communicated, and a filtering device and a coolingdevice are arranged on the air discharging pipeline. The invention aims to provide the battery pack heat dissipating device. High-temperature high-pressure gas which is generated during a thermal runaway of batteries can be discharged to the outer portion through the gas discharging pipeline, the filtering device and the cooling device are arranged on the gas discharging pipeline, the filtering device can adsorb particles in the high-temperature high-pressure gas, and convert the harmful gas in the high-temperature high-pressure gas into harmless gas, and then after cooling is conducted by the cooling device, the safe gas is discharged to the outer portion of the box, so that temperature reduction and the air pressure stability in the box are guaranteed, the phenomena of cattery internaldamage and series burnout of other units of the battery pack are prevented, damage is reduced, and the safety of the battery pack is guaranteed.

The invention discloses an air pressure control method and device used for photonic band gap optical fiber drawing, and belongs to the technical field of optical fiber manufacturing. The method includes firstly inserting an intermediate into an intermediate fixing table, sealing the intermediate and the intermediate fixing table with sealing glue, connecting a single-cavity body and a double-cavity body in a threaded manner, with a fiber core duct being inserted into an intermediate fiber core during connection, and after assembling is finished, communicating a fiber-core-cavity gas pipe port, a cladding-cavity gas pipe port and an outer-cavity gas pipe port to a gas chamber of an air pressure control electric part through gas guiding pipes separately to achieve independent air pressure control of three regions which are a fiber core cavity, a cladding cavity and an outer cavity. The method and the device overcome a problem of independent precise air pressure control of the three regions during a photonic band gap optical fiber drawing process. The method and the device have universality and are suitable for porous micro-structured optical fiber drawing requiring independent air pressure control for separated regions. A pressure difference is adopted to determine on-off control time of an electromagnetic valve, thus controlling a gas flux through the pressure difference and increasing air pressure control precision.

The invention relates to a deflection-swinging type semi-automatic rod replacing hydraulic rock drilling machine. The machine comprises a carrier machine, a movable arm and a drilling machine body. One end of the movable arm is arranged at the upper end of the carrier machine, and the other end of the movable arm is connected with the middle of the drilling machine body. The movable arm drives the drilling machine body to swing in a deflected mode. Compared with the prior art, drill rod replacing is convenient, potential safety hazards are reduced, the directions for deflection swinging of the drilling machine are increased, and drilling precision is improved.

The invention relates to a loudspeaker module. The loudspeaker module comprises a shell and a loudspeaker monomer; the loudspeaker monomer is contained in the shell, and has a vibrating diaphragm; theshell comprises a top wall, a bottom wall and a side wall; the bottom wall is opposite to the top wall; the side wall is connected to the top wall and the bottom wall; the vibrating diaphragm of theloudspeaker monomer is arranged to be just aligned to the bottom wall; the loudspeaker module further comprises support steps; the support steps extend from the inside surface of the shell to the loudspeaker monomer, and fix the loudspeaker monomer; one side of the loudspeaker monomer close to the vibrating diaphragm is arranged on the support steps; furthermore, a monomer containing cavity is divided into a front sound cavity and a rear sound cavity; the front sound cavity is formed among the support steps, the bottom wall and the vibrating diaphragm; the rear sound cavity is formed among theloudspeaker monomer, the side wall, the support steps and the top wall; at least one part of the support steps is opposite to the bottom wall, and arranged at intervals, so that a leakage channel communicated with the front sound cavity is formed; a leakage hole communicated with the leakage channel and the rear sound cavity is arranged on the support steps in a penetrating manner; and a waterproof breathable film is pasted on the leakage hole. Thereby, the waterproof and dustproof properties can be realized while gas leakage and pressure stability are ensured; and the product reliability isimproved.

The invention discloses a rural water-saving and odorless ecological toilet for separation and collection of faeces and urine. The rural water-saving and odorless ecological toilet for separation and collection of the faeces and urine comprises a faeces pool and a tank body, wherein a bottom plate is arranged in the tank body, and the tank body is divided into an upper part and a lower part through the bottom plate; a toilet bowl is arranged at the upper part of the interior of the tank body, and the faeces pool is arranged below the outside of the tank body; the toilet bowl is communicated with the faeces pool, and the faeces pool is also connected with a dry faeces chamber; the dry faeces chamber is internally provided with a drying device, and the faeces pool is internally provided with a faeces processing device; a rainwater box and a control device are arranged on the top of the outer surface of the tank body, and a solar battery panel is arranged on the control device. Since a bio-fermentation chamber, a liquid fertilizer pool and a dry faeces pool are connected with the faeces pool, every time a toilet user finishes an excrement, separation of the faeces and the urine is conducted firstly, then the faeces in the faces pool is subjected to bio-degradation and temperature-raising dehydration, and solid faeces are processed into faeces blocks or granules which are then stored in the dry faeces pool for weathering and drying; the emitting amount of odor of the faeces after dehydration is greatly reduced, so that the surrounding environment is protected.

The invention discloses a device for improving the quality of ring-spun yarn by means of a swirl nozzle and belongs to the technical field of textile engineering. The device is called swirl nozzle for short. The swirl nozzle is mainly composed of a yarn path and an air path and is installed on a ring spinning frame and located between a front roller and a yarn guide wire. Airflow enters the yarn path through the air path after being injected in, so that rotational flow is formed to conduct untwisting and re-twisting on hairy yarn, and then hairiness is effectively reduced and the yarn evenness and strength of spun yarn are improved. The device is simple in structure, low in transformation cost, convenient to install and high in development and application value.

The invention discloses a pneumatic type rice precision dry direct sowing machine capable of synchronously realizing ditch opening, fertilization and ground flattening. The machine is divided into two parts, namely a main body part and a hanging part; the machine comprises nine units, namely a ditch opening unit, a ground flattening unit, a main rack, a fertilization unit, an air-pressure unit, a secondary rack, a land wheel system, a sowing system and an earth covering and suppression unit; a rice precision pneumatic type seed-metering device capable of sucking seeds by negative pressure and cleaning seeds by positive pressure is carried, a mini-type ditch opening plough is used for opening a ditch and front and back spiral blades are matched to flatten the ground; meanwhile, deep fertilization of a base fertilizer and soil covering are realized; a hanging type single body sowing mechanism is used for realizing anywhere profiling; functions of flattening the ground, opening the fertilizer ditch, deeply fertilizing on the lower side, opening the ditch, opening seed ditches, sowing seeds, covering the soil and suppressing can be realized on a primarily-prepared dry land; rice planting procedures and the labor intensity can be effectively reduced and the effects of saving cost and synergizing are realized.

The invention discloses a medical compressed air supplying device and a control method thereof. The device comprises a first air compressor, a second air compressor, an air storage tank, a first filter, a second filter, an air drier, a sterilizing filter and a controller, wherein the first air compressor and the second air compressor are arranged in parallel; the air storing tank, the first filter, the second filter, the air drier and the sterilizing filter are sequentially connected; a first pressure transformer and a first solenoid valve are arranged on an outlet pipeline of the first air compressor; a second pressure transformer and a second solenoid valve are arranged on the outlet pipeline of the second air compressor. According to the device, the controller is used for acquiring the outlet air pressure of the first air compressor or the second air compressor and determining, and then timely switching the use and standby states of the first air compressor and the second air compressor, so that either of the two air compressors keeps running stably all the time to continuously supply stable air pressure, and ensure the life safety of a patient using respirator.

The invention discloses a medical adjustable lip opening device. The device comprises an annular base plate, wherein an outer ring body and an inner ring body are concentrically fixed on the base plate; the outer ring body is positioned at the outer ring of the base plate; the diameter of the inner ring body is equal to the average value of the diameters of the inner ring and the outer ring of thebase plate; the inner ring of the outer ring body is provided with an outer groove; the outer ring of the inner ring body is provided with an inner groove; the outer groove and the inner groove are jointly and slidably connected to a plurality of movable blocks; and each movable block is fixedly connected to a plastic rod parallel to the axis of the base plate. The device has the advantages that:in the invention, the lips of a patient are opened by a soft bag, and the pressure of the soft bag to each position of the oral cavity of the patient is equal so as to reduce discomfort; when the opening size is proper, the inner lead is electrified, so that the shapes of the plastic rod and the slide blocks cannot be continuously changed; and in the invention, partial structures such as a rubberhead are arranged, so that the extrusion force of the soft bag to each point is fully ensured to be equal.

The invention provides a durability testing platform of automobile air brake manual controlling valve. The durability testing platform of automobile air brake manual controlling valve comprises a simulated movement machinery loading part and a pneumatic part driving the simulated movement machinery loading part. The machinery loading part comprises a support part, a sample fixing part, a handle swing arm and a swing arm driving part. The support part comprises a base plate. A standing plate perpendicular to the base plate is arranged on one side of the base plate. A straight line opening is arranged in the middle of the standing plate. A slide block slide is arranged on the upper half portion of the straight line opening. One side of the standing plate is connected with a sample fixing block. The swing arm driving part comprises straight line driving and swinging driving. A straight line driving air cylinder is installed on the base plate and is arranged in the straight line opening of the standing plate. A cylinder rod of the straight line driving air cylinder is connected with a sliding block. The sliding block is arranged in the slide. The handle swing arm is arranged on the upper portion of the riser. Two side arms at the lower end of the handle swing arm cross the upper end of the riser and are connected with the sliding block in a hinged mode through a shaft pin. The bottom of the swinging air cylinder is connected with the other side of the base plate through a lower hinged base. The cylinder rod of the swinging air cylinder is connected with an upper hinge base at the upper end of the handle swing arm in a hinged mode through a connecting fork. A handle claw is arranged at the upper end of the handle swing arm.