117results about How to "Improve ejection ability" patented technology

The invention discloses an ejector for an engine test bed exhaust system. The ejector comprises a low-pressure chamber, a transition section, a mixing convergence section, a mixing equal-straight section and a mixing expansion section, all of which are sequentially and coaxially connected. The low-pressure chamber comprises a low-pressure chamber shell and a flange. An annular flow diverting and guiding device, an ejecting airflow conveying pipeline, an ejecting airflow convergence section and an ejecting airflow expansion section are sequentially and coaxially connected into the low-pressure chamber. An inlet of the annular flow diverting and guiding device is connected with an ejecting airflow intake manifold, the center line of the ejecting airflow conveying pipeline coincides with that of the low-pressure chamber shell, an outlet of the low-pressure chamber and an outlet section of the ejecting airflow expansion section are located on the same vertical plane, the low-pressure chamber is connected with an ejector fixed support, and the mixing equal-straight section is connected with an ejector movable support. The ejector is high in ejection performance, testing efficiency is improved, the testing cost is reduced, and the ejector movable support absorbs the axial length change caused by thermal expansion and cold shrinkage of the ejector in a connected mode.

The invention relates to tread rubber filled with environment-friendly white carbon black and butadiene styrene rubber and a preparation method of the tread rubber. The tread rubber comprises the following components in parts by weight: 25-40 parts of natural rubber, 60-75 parts of butadiene styrene rubber, 25-45 parts of carbon black, 15-35 parts of white carbon black, 2-4 parts of aromatic oil,1.5-2.5 parts of stearic acid, 3-4 parts of zinc oxide, 1-2 parts of tackifying resin, 1.5-2 parts of anti-cracking resin, 1.5-2.5 parts of an anti-ager 4010NA, 1.5-2 parts of microcrystalline wax, 1.2-1.5 parts of an accelerator NOBS, 0.3-0.5 part of an accelerator TMTD, 1.5-2 parts of sulfur and 0.1-0.3 part of a scorch retarder. The components are subjected to primary mixing, secondary mixing and final mixing to obtain the tread rubber. The preparation method is simple and easy to operate in step; owing to modified rice-husk-source white carbon black, clustering in basic rubber can be reduced; the machinability and the wear resistance of the tread rubber are improved; rolling resistance of a tire can be effectively reduced; and the wet-skid resistance is improved.

The invention discloses an air exhaust device for an ultrasonic engine jet pipe exhaust simulation experiment. The air exhaust device comprises a tail chamber, an injector and a two-stage injector. The tail chamber comprises a fixed large tail chamber and a replaceable small tail chamber. The fixed large tail chamber comprises a tail chamber convergent segment, a tail chamber equal-diameter segment and a tail chamber expanding segment. The replaceable small tail chamber comprises a small tail chamber flange and a small tail chamber cylinder. The small tail chamber cylinder is arranged in the tail chamber convergent segment. The fixed large tail chamber is provided with a circulated cooling water device and a cooling water spraying device. The injector comprises a low-pressure chamber, a transition segment, a blending convergent segment, a blending equal-diameter segment and a blending expanding segment. The low-pressure chamber is internally and fixedly connected with an annular shunting flow guiding device, an injected air current conveying pipe, an injected air current convergent segment and an injected air current expanding segment. The outlet of the low-pressure chamber and the outlet cross section of the injected air current expanding segment are in the same vertical plane. The air exhaust device can satisfy an experiment requirement for simulating high-altitude flight states of different ultrasonic engines on ground.

The invention discloses a large flow liquid oxygen supercooling method based on a supersonic ejector. The large flow liquid oxygen supercooling method comprises the steps that a heat exchanger used inconventional saturated liquid nitrogen supercooling liquid oxygen is used as a primary heat exchanger, and the liquid oxygen with a supercooling flow rate greater than 4500 L/min can be supercooled from 92K to 80K; a secondary heat exchanger is arranged at the downstream position of the primary heat exchanger to supercool the liquid oxygen which is supercooled to 80K and with the supercooling flow rate greater than 4500L/min to below 67K; the secondary heat exchanger is filled with liquid nitrogen in a saturated state, the temperature of the liquid nitrogen in the secondary heat exchanger isno more than 64K, and an air outlet of the secondary heat exchanger is connected with an ejected airflow inlet of the supersonic ejector; an ejector airflow inlet of the supersonic ejector is connected to a gas outlet of a gas generator; the supersonic ejector sequentially includes a mixing section, a super-expansion section and a sub-expansion section which are arranged coaxially in the directionof the airflow; and the mixing section is a conical isobaric mixing chamber with a contracted cross section. The large flow liquid oxygen supercooling method can meet the needs of rapid cooling and filling of large-flow liquid oxygen before launching such as CZ-5. In addition, the pumping capacity of the supersonic ejector can be matched with the load, and more security and reliability are achieved.

The invention relates to an ejector with adjustable structure parameters. The ejector comprises a working nozzle, a low-pressure air inlet chamber, a straight pipe section, a diffusion chamber and a low-pressure air inlet chamber inlet pipeline. The diffusion chamber is formed by nesting three stages of diffusion pipes, so that a structure of the diffusion chamber can be changed through adjustingrelative positions of the diffusion pipes. The straight pipe section is formed by a basic straight pipe section and two stages of detachable straight pipe sections, so that the length of the straightpipe section can be adjusted through disassembling or installing detachable parts. A low-pressure air inlet chamber wheel disc and a working nozzle wheel disc are connected with the low-pressure air inlet chamber and the working nozzle into a whole; and during assembling, a main body of the working nozzle stretches into the low-pressure air inlet chamber, and a distance between the low-pressure air inlet chamber wheel disc and the working nozzle wheel disc is changed through adjusting an adjustable bolt, so that an outlet position of the working nozzle is adjusted. According to the ejector with the adjustable structure parameters provided by the invention, the structure parameters of the ejector can be correspondingly adjusted according to the change of an operation condition, so that an ejecting performance of the ejector under varying duty operation situations such as natural gas extraction is improved.

The invention provides a throat area adjustable static momentum-enhanced ejector and belongs to the technical field of fluid jet pressurization. The ejector is subjected to operation optimization andcan realize adjustment of the large-scale working condition through an adjusting mechanism. The throat area corresponds to the rotating angle. The optimum condition under different parameters can be rapidly located through stepless adjustment of the throat area and the axial position of a spray nozzle. A rigid metal insertion sheet is fixedly constrained between a driving spray nozzle through holeand an adjustable base groove. The throat area adjustable static momentum-enhanced ejector is concise, firm, high in shock resistance and more suitable for fluid flowing. A static momentum-enhanced structure is added to a driving spray nozzle outlet. Generated disturbance can fully develop to induce fluid to conduct circumferential and radial momentum exchange, momentum exchange of driving fluidand driven fluid is enhanced, the length of a mixing chamber is shortened, and the ejecting performance is improved. Different types of rigid metal insertion sheets and static rotational flow structures can be selected to adapt to different requirements. An operator just needs to exchange different rigid metal insertion sheets and adjustable bases. The throat area adjustable static momentum-enhanced ejector is convenient to adjust.

The invention discloses a pulverized coal pre-pyrolyzation decoupling combustion device comprising a pyrolysis chamber, a cyclone separator, an ejector device and a particle burning device; the pyrolysis chamber is provided with a raw material inlet and a product outlet; the cyclone separator is provided with a product inlet, a volatile component outlet and a particle outlet; the product inlet ofthe cyclone separator communicates with the product outlet of the pyrolysis chamber through a pyrolysis product transport passage; a reburning fuel pipe is arranged at the volatile component outlet ofthe cyclone separator; a discharging pipe is arranged at the particle outlet of the cyclone separator; the reburning fuel pipe is used for being led into a hearth; the discharging pipe communicates with a particle combustion device through the ejector device; ejector gas flow is led into the ejector device; a particle combustion device comprises an air duct; and the air duct is led into the hearth. The pulverized coal pre-pyrolyzation decoupling combustion device is based on the decoupling idea, is suitable for pulverized coal decoupling combustion, can achieve the higher pulverized coal combustion rate, is relatively good in combustion stability, and can effectively suppress NOx generation.

The invention discloses an upper air inlet combustor. The upper air inlet combustor at least comprises a combustor main body and a combustor mounting base, wherein a ring-shaped gas mixing cavity is additionally arranged at the outer side of the combustor main body; an included-angle type outer ring ejector is arranged on the bottom non-center part of the combustor, so that the length of the outerring ejector is remarkably increased; and on the combustor mounting base, two outer ring spray nozzles share one spray nozzle mounting base and one fuel gas channel, so that flow loss, in the spray nozzle base, of gas is reduced, and the outer ring spray nozzle mounting base is more compact in structure. According to the gas stove disclosed by the invention, two openings which correspond to the spray nozzle mounting base on the combustor mounting base are formed in a liquor containing disc. The upper air inlet combustor has the beneficial effects that: combustion performances are remarkably improved, thermal load of the gas stove can be 4.0-4.5 kW, and heating efficiency can meet primary energy efficiency requirements; and the combustor main body adopts aluminum die casting or plate stretch-forming. The gas stove can realize an ultrathin structure, is free of holes in a stove surface; and the combustor is convenient to dismount, and is easier to clean and maintain.

The invention discloses a multi-channel ejector for a gas cooker, and provides a burner and a gas cooker. The multi-channel ejector for the gas cooker comprises at least two nozzles and an ejecting pipe, wherein the nozzles and the ejecting pipe are sequentially arranged along the air flow direction; the nozzles are in butt joint with the ejecting pipe; the ejecting pipe is composed of a suction shrink tube, a mixing pipe and a diffuser pipe which are sequentially connected according to the air flow direction and changes of the cross sections; the mixing pipe is composed of branch mixing pipeswith same quantity of nozzles; and each nozzle corresponds to one branch mixing pipe. According to the multi-channel ejector for a gas cooker, the mixing pipe is divided into multiple branch mixing pipes, multiple nozzles are arranged, and each of the nozzles corresponds to one branch mixing pipe, so that the gas and the air are mixed more uniformly, the mixing effect of the gas and the air is improved, and the ejection ability is improved as well.

The invention discloses a refrigeration system and a control method of the refrigeration system. The refrigeration system comprises a compressor, a heat exchanger assembly, an ejection pipeline, a control valve and a controller. The compressor is provided with a first oil level detection part and a second oil level detection part, and the first oil level detection part and the second oil level detection part are used for detecting oil levels at different positions in the compressor. The heat exchanger assembly is provided with an ejection port. One end of the ejection pipeline communicates with the ejection port, and the other end of the ejection pipeline communicates with the compressor. The control valve is arranged on the ejection pipeline to control on-off of the ejection pipeline. Thefirst oil level detection part, the second oil level detection part and the control valve are all connected with the controller. According to the refrigeration system, the controller judges the stateof the oil level in the compressor by combining the detection results of the first oil level detection part and the second oil level detection part so as to control the state of the control valve forcontrolling on-off of the ejection pipeline, and therefore controllability of ejection and oil return of the heat exchanger assembly for the compressor can be achieved.

The invention provides an injection mixer which is applied to a variable cycle engine and mainly structurally comprises a two-stage lobe mixer driven by an actuating device and used for strengthening mixing of inner culvert airflow and outer culvert airflow. The two stages of lobe mixers are arranged in a series connection mode, and the axial distance between the two stages of lobe mixers is changed through the actuating device, so that the interstage flow area of the lobe mixers is changed, and the function that the duct flow capacity is adjusted through the rear variable-area duct ejector is achieved. Compared with an annular mixer, the characteristic that the lobe mixer has higher mixing capacity on airflow is utilized, under the condition that the function that the rear variable ejector changes the circulation area of the outer culvert is achieved, the mixing quality of the inner culvert airflow and the outer culvert airflow behind the turbine is improved, the outlet temperature distribution of the ejection mixer is more uniform, and the mixing efficiency is improved. And favorable conditions are provided for combustion organization of a downstream afterburner. The invention further provides a control method of the injection mixer.

The invention discloses a combined jet ejection type steam-water hybrid heating device suitable for a low-pressure working condition. The device comprises a zooming arc-shaped mixing chamber, a diffusion chamber, a steam-water mixing reinforcement chamber, a plurality of condensed water ejection type inlets and at least two steam inlets, wherein one end face of the zooming arc-shaped mixing chamber is connected with one end face of the steam-water mixing reinforcement chamber in a coaxial way, and the other end face of the steam-water mixing reinforcement chamber is connected with the diffusion chamber in a coaxial way; the plurality of condensed water ejection type inlets are connected with the other end face of the zooming arc-shaped mixing chamber; the pipe wall of the throat part of the zooming arc-shaped mixing chamber is connected with the at least two steam inlets. The ratio of the end face diameter to the tube length of the zooming arc-shaped mixing chamber is equal to 0.2-0.5;the ratio of the total cross-sectional area of the plurality of condensed water ejection type inlets to the cross-sectional area of a throat pipe of the steam-water mixing reinforcement chamber is equal to 0.008-0.02; the ratio of the total cross-sectional area of the plurality of condensed water ejection type inlets to the total cross-sectional area of the steam inlets is equal to 0.03-0.07; theratio of the cross-sectional area of the throat part of the steam-water mixing reinforcement chamber to the cross-sectional area of an outlet of the diffusion chamber is equal to 2-5; the ratio of the diameter of the throat part to the diameter of the end face of the zooming arc-shaped mixing chamber is equal to 0.50-0.99.

The invention discloses a burner and a gas cooker. The burner comprises a flamethrower and a bottom cup. The flamethrower is provided with a first center. A gas mixing cavity and a fire hole communicating with the gas mixing cavity are formed in the flamethrower. The bottom cup is provided with a second center. An ejection channel with a Venturi effect is formed in the bottom cup. The flamethroweris installed on the bottom cup. The first center and the second center are arranged eccentrically. The ejection channel communicates with the gas mixing cavity. The first center of the flamethrower and the second center of the bottom cup are arranged eccentrically, thus the bottom cup can have more space for the longer ejection channel, the ejection channel has large ejection ability, the heat load of the burner can be improved, the amount of mixed gas of gas and air entering the gas mixing cavity can be ensured, and then stability of burning of the burner is ensured.

A small-flow incoming flow parameter simulation system is characterized in that a cooling water system is respectively communicated with a stable measurement section, an air inlet spray pipe, a hot air switching and bypass device, a cooling device and a tail chamber, and provides cooling water for cooling the components; a liquid fuel supply system and a gas fuel supply system provide fuel for the main gas inlet path fuel heating device; an oxygen supplementing system provides liquid oxygen for the main gas inlet path oxygen supplementing mixer and is used for combustion of fuel in the main gas inlet path fuel heating device; a particle loading system is used for loading particles for a test; and a process gas system is communicated with an operation gas source of a pneumatic valve of the system. According to the small-flow incoming flow parameter simulation system, accurate simulation of small-flow incoming flow parameters can be effectively achieved, the mass flow of particles can be accurately and effectively controlled, an effective closed-loop control system is formed, and the test state is effectively observed.

The invention relates to a burner for a gas stove. The burner is characterized by comprising a pedestal. The pedestal is provided with an injection pipe, a burner cap and a gas channel, wherein the injection pipe is arranged at the bottom of the pedestal; the burner cap is arranged on the pedestal and forms an independent gas mixing chamber with the pedestal; and the gas channel is arranged at thebottom of the pedestal and penetrates the center position of the pedestal longitudinally. The gas channel comprises a runner communicating to the gas mixing chamber and the injection pipe. Compared with the prior art, the burner has the advantages that the conventional gas mixing chamber, injection pipe and pedestal are integrated, and meanwhile, the conventional inner and outer ring burner capsare integrated, so that the whole burner is minimized; in addition, the runner of the gas channel can replace an expanded segment of an existing injection pipe, and meanwhile, the runner is designed to prolong the injection pipe, so that the injection ability can be also enhanced while the integral height of the burner is reduced so as to generate a good gas and primary air mixing effect. Therefore, the integral burner is in a good burning working condition.

The invention discloses a combustor. The combustor comprises a distributor, the distributor comprises a body and at least two injection pipes, at least two mixed gas tanks are formed in the body, at least two injection pipes are located below the body and communicate with at least two mixed gas tanks respectively, when the combustor is horizontally placed, the included angle between at least one of at least two injection pipes and the horizontal direction is 15-75 degrees, and at least one injection pipe is basically perpendicular to the horizontal direction. According to the combustor in theembodiment, the inclined and vertical injection pipes are matched with each other, the ejection capacity of the injection pipes can be enhanced through the inclined injection pipe, so that fuel gas iscombusted more sufficiently, while the vertical injection pipe can be used for auxiliary heating, under the condition that the injection capacity required by the mixed gas tanks is met, a material ofthe injection pipes can be saved, and the manufacturing difficulty of the distributor can be reduced.

The invention discloses a supersonic air injection device. The supersonic air injection device is mainly composed of a mounting plate, an air duct transition section, an injection pipe, spray pipes, a secondary cooling air duct, a supporting plate and an inlet pipe nozzle. The injection pipe is arranged in the middle of the air duct transition section, and the spray pipes are symmetrically arranged Laval spray pipes. High-temperature and high-pressure gas enters through the inlet pipe nozzle, flows through the injection pipe and is sprayed out from the spray pipes, a negative pressure area is formed, and low-temperature air is sucked in from an air inlet, passes through the mounting plate and the air duct transition section, is mixed at the secondary cooling air duct and flows out from an air outlet. The supersonic air injection device is used for injecting the low-temperature air through the high-temperature and high-pressure gas, and the injected low-temperature air can serve as a cold source to be supplied to equipment for heat dissipation. The layout of the spray pipes and flow channels is more reasonable, the mixing uniformity of injection airflow and injected airflow is improved, and therefore the injection effect can be effectively improved.