130results about How to "Reduce backflow" patented technology

The foam-dispensing pump container according to the present invention has the valve seat portion which protrudes inwardly below the air-liquid mixing unit and which is formed of the flexible member that can come into contact with the outer peripheral face of the latch portion of the rod-shaped valve body, and immediately after the nozzle head starts rising, the flexible valve seat portion comes into contact with the rod-shaped valve body before the upper opening end of the liquid chamber comes into contact with the rod-shaped valve body, thereby significantly reducing a backflow of the foam or liquid into the air passage, and consequently improving the usability of the foam-dispensing pump container.

The cyclone-type dust collecting apparatus for a vacuum cleaner can reduce reverse flow of dirt and kill any bacteria in the dirt-collecting receptacle. The cyclone-type dust-collecting apparatus has a protruding flow path formed on the front side of the cyclone body and a lamp-positioning groove depressed inwardly at one side of the dirt-collecting receptacle for an ultraviolet lamp disposed in the cleaner body to apply ultraviolet rays radiated into the dirt-collecting receptacle. Accordingly, various bacteria inside the dirt collecting receptacle can be killed as the ultraviolet lamp disposed in the lamp positioning groove of the dirt collecting receptacle continuously applies the ultraviolet rays into the dirt collecting receptacle while the cleaner is on. Moreover, reverse flow of the dirt through the protruding flow path can be reduced as the storage level of the dirt stored near the protruding flow path of the dirt collecting receptacle is lowered and the space between the dirt near the protruding flow path of the dirt collecting receptacle and the cyclone body is expanded.

There is provided a method of driving an electromagnetic pump where noise and vibration that accompany abrupt fluctuations in pressure inside a pump chamber are reduced. A pulse voltage is applied alternately on a positive side and a negative side to drive the electromagnetic coil such that a change in voltage that occurs when the polarity of the pulse voltage is inverted has a continuous slope at least between the positive side and the negative side.

A machine for regenerating and granulating the used or rejected plastics is composed of exhaust-type extruder, filter, cutting-granulating unit, screw conveyer, drier and air delivering system.

The invention relates to a wheel flange sealing structure, a turbine and a gas turbine. The wheel flange sealing structure comprises a first flange plate (3), a second flange plate (4) and a third flange plate (5), wherein the first flange plate (3) and the second flange plate (4) are arranged at the root part of a movable blade (1), and the third flange plate (5) is arranged at the root part of aguiding blade (2). The first flange plate is closer to the movable blade compared with the second flange plate. The third flange plate extends into an opening formed between the first flange plate and the second flange plate, and the third flange plate forms a first chamber (8) for circulation of sealing gas at least with the first flange plate and the second flange plate. The first chamber (8) is provided with an injector hole (6). The injector hole (6) is used for injecting high-pressure gas into the first chamber (8), wherein the pressure of the high-pressure gas is higher than that of thesealing gas, so that the sealing gas is driven to flow out of the first chamber (8) through jet action of the high-pressure gas. According to the wheel flange sealing structure, the jet action of thehigh-pressure gas is introduced in by forming the injector hole, flowing of the sealing gas is accelerated, the using amount of the sealing gas is decreased, the sealing effect is improved, the requirement for the sealing pressure difference is reduced, and backward flow of main gas is reduced.

Methods and systems are provided for operating a split exhaust engine system that provides blowthrough air and exhaust gas recirculation to an intake passage via a first exhaust manifold and exhaust gas to an exhaust passage via a second exhaust manifold. In one example, one or more valves of a set of first exhaust valves coupled to the second exhaust manifold may be deactivated in response to select engine operating conditions, while maintaining active all valves of a set of second exhaust valves coupled to the first exhaust manifold. The select engine operating conditions may include one or more of a deceleration fuel shut-off condition, a part throttle condition, and a cold start condition.

The invention discloses a novel energy-saving low noise diesel generator set. The diesel engine power is between 30kw and 130kw and the corresponding generator power is between 20kw and 100kw, the diesel engine is a supercharged intercooled diesel engine of which the rated rotary speed is 1000r/min and the fuel consumption is 205-210g/kw.h, thus obviously saving energy; the exhaust pipe adopts a divided exhaust pipe, 20mm space is reserved between the height of the baffle and the flange plane of the supercharger arranged on the exhaust manifold, thus effectively avoiding the influences on the supercharger efficiency due to excessively high temperature caused by the crossed exhaust gas of the engine; a silenced case body is added to the engine set, a high-performance shock absorber is adopted, an efficient PUR (poly urethane resin) type antiflaming sound absorbing sheet is pasted in the case body and a labyrinth type inlet air mulffer device made from a high-efficiency damping material is adopted to reduce the source of noises. Experimental results show that the energy-saving low noise diesel generator set can operate reliably for a long time with a controllable noise value of 65-70dB(A) at one meter).

The invention provides an anti-backflow method for a grid-connected power generation system. The anti-backflow method comprises the following steps of: A) respectively acquiring power generation power of a photovoltaic system and load power of a load, and calculating a reference quantity alpha, wherein the alpha=power generation power/load power; and B) comparing the reference quantity alpha with a preset adjustment value epsilon 2, and if the reference quantity alpha is larger than the adjustment value epsilon 2, controlling the power generation power and reducing the alpha, wherein the epsilon 2 is more than 0 and less than 1. The reference quantity alpha is reduced to ensure that the value fluctuates in the vicinity of the adjustment value epsilon 2 at most; and simultaneously, as the adjustment value epsilon 2 is less than 1, the possibility of enabling the reference quantity alpha to be more than 1 is very small, namely that the power generation power of the whole grid-connected power generation system can not be more than the power required for the load basically, the existence of surplus electric energy for being sent into an electric fence can be avoided basically, and the possibility of production of backflow is very small. According to the method, by establishing a functional module framework, a computer system is controlled by a computer program command to complete the operation.

The invention discloses a lactic acid bacterium composition for protecting the gastrointestinal mucosa. The lactic acid bacterium composition comprises the following components in parts by weight: 5-20 parts of bifidobacterium lactis, 0.5-2 parts of bifidobacterium infantis, 8-25 parts of lactobacillus rhamnosus, 3-20 parts of lactobacillus acidophilus, 3-20 parts of lactobacillus plantarum and 8-25 parts of lactobacillus salivarius. The invention further discloses a processing method for the lactic acid bacterium composition. The processing method comprises the following steps: (1), preparing sclerotia; (2), embedding non-reducing sugar; (3), embedding skimmed milk; and (4), freeze-drying. The lactic acid bacterium composition provided by the invention has the advantages of adjusting gastrointestinal microorganisms to be balanced and protecting the gastrointestinal mucosa.

The invention provides a treatment method for wastewater with high ammonia nitrogen content. According to the invention, after copper ions in the wastewater with high ammonia nitrogen content are adsorbed, obtained wastewater is converged to enter an adjusting pool; the amount and quality of the wastewater are adjusted in the adjusting pool; adjusted wastewater in the adjusting pool is lifted to amembrane treatment system through a lift pump, and then quantitatively pumped to an anoxic pool through a metering pump; a denitrification site is provided; an aeration tray is arranged in the anoxicpool to avoid sludge from sedimentation; a mixed solution in the anoxic pool automatically flows into MBBR which provides a nitrification-denitrification site; effluent of the MBBR automatically flows into an FMBR membrane pool for solid-liquid separation of a large amount of suspended solids; nitrogen is removed through the following three ways in an FMBR treatment process: 1) nitrification-denitrification, 2) short-range nitrification-denitrification, and 3) anaerobic ammonia oxidation; sludge remaining in the FMBR membrane pool is discharged to a sludge pool; after sludge is treated through a submerged air blower pool, treated sludge is discharged to a comprehensive pool for further treatment; thus, the removal rate of ammonia nitrogen reaches 99% or above, and high treatment efficiency and good effluent water quality are achieved; equipment is compact and occupies small land area; and automatic control is easily realized, and operation management is simple.

The invention discloses a ceiling type ventilation fan. The ceiling type ventilation fan comprises an air ventilating structure. The air ventilating structure comprises a multi-vane impeller, a snail shell, an impeller drive motor and a motor installation frame. The snail shell comprises a shell body, an air inlet and an air outlet. The multi-vane impeller is arranged inside the shell body in the vertical direction. The motor installation frame is arranged above the multi-vane impeller and is separated from the multi-vane impeller. The bottom middle area, away from the direction of the multi-vane impeller, of the shell body protrudes and forms a first concave portion. The air inlet is formed in the bottom of the first concave portion, and the air inlet and the first concave portion form a first annular boss-shaped structure. The lower end of the multi-vane impeller extends into the first annular boss-shaped structure, is opposite to the air inlet, and is further isolated from the inner wall of the first concave portion and the air inlet. Under the conditions that the ventilation fan is communicated with a long outdoor pipeline or the external wind pressure is large, the multi-vane impeller can be prevented from touching the motor installation frame or the snail shell, and when the multi-vane impeller of the same performance is adopted, air reverse flow and abnormal sounds are reduced.

The invention discloses a wide and narrow passage plate type flooded generator, a wide and narrow passage plate type falling film absorber and an ammonia water absorption refrigerator. Waste heat passes through wide waste heat passages of the wide and narrow passage plate type flooded generator and then are used for heating concentrated ammonia water reversely flowing from narrow concentrated ammonia water passages to generate a gas-liquid mixture entering a gas-liquid separator, water-containing ammonia is separated and is condensed to form liquid ammonia in a plate type condenser after being purified by a fractional condenser, and the liquid ammonia is delivered into a liquid ammonia tank; liquid ammonia discharged from the liquid ammonia tank enters a heat exchange tube of a subcooler, and is supplied to a plate type evaporator and evaporated to form cold ammonia after being subjected to further heat exchange with cold ammonia discharged from the plate type evaporator, the cold ammonia enters the subcooler to be subjected to further heat exchange with the liquid ammonia in the heat exchange tube, enters a concentrated ammonia water outlet header on the lower part of the wide and narrow passage plate type falling film absorber under the action of differential pressure, rises along narrow diluted ammonia water passages, and is absorbed by diluted ammonia water which is discharged from the gas-liquid separator and cooled by a solution heat exchanger to form concentrated ammonia water, and the concentrated ammonia water enters a concentrated ammonia water tank, and is pumped into the wide and narrow passage plate type flooded generator through a solution pump.

The invention provides a centrifugal fan which can inhibit the noise of single centrifugal fan and acoustic resonance of a whole device comprising the centrifugal fan at the same time. A plurality of blades are radially arranged relative to a spindle so as to form a cylindrical impeller, and then the impeller is installed in a volute. A first opening part having a bell-shaped opening is arranged on a cover plate that covers the volute in the axial direction of the rotation shaft. A guiding plate having a second opening part with a bell-shaped opening is arranged in the first opening part and a gap is formed between the cover plate and the guiding plate. The gap is communicated with the atmosphere so as to reduce negative pressure formed between the top end of the second opening part and the blades of the propeller. So the reverse air flow, which causes the noise, from the outer side to the inner side of the impeller is reduced. The surface ratio of the gap to the opening part of the second opening part is 3 to 15%. The provided centrifugal fan can inhibit the noise of single centrifugal fan and acoustic resonance of a whole device comprising the centrifugal fan.

Provided is a shower plate which can completely prevent generation of plasma reverse flow or ignition of plasma excitation gas at a vertical hole section for more efficient plasma excitation. A shower plate (105) is arranged in a processing chamber (102) in a plasma processing apparatus, and discharges plasma excitation gas for generating plasma in the processing chamber (102). A porous gas communicating body (114) having pores communicating in a gas communicating direction is mounted on a vertical hole (112) to be a discharge path for the plasma excitation gas. The pore diameter of an overflow path in a gas communicating path formed by the communicating pores of the porous gas communicating body (114) is 10[mu]m or less.

The invention discloses an air film hole channel structure based on a Tesla valve and application of the air film hole channel structure to the front edge of a turbine blade, and belongs to the field of gas turbines. The air film hole channel structure comprises a Tesla valve channel and outlet air film holes, wherein the Tesla valve channel is of a Tesla valve structure, cooling airflow flows from an inlet to an outlet of the Tesla valve channel in a one-way mode, the multiple outlet air film holes are located at the outlet of the Tesla valve channel and used for introducing cooling gas into the wall face to be cooled, and the axial direction of the outlet gas film holes is parallel to the axial direction of the outlet of the Tesla valve channel. According to the air film hole channel structure, the Tesla valve channel is introduced to a film hole in the front edge of the end wall of a stationary blade, and the geometric dimension of the Tesla valve channel is matched with that of the film hole; and due to the introduction of the Tesla valve channel, not only is the backflow of high-temperature airflow obviously weakened, but also the end wall near the stagnation point of the front edge of the stationary blade and the suction surface of the stationary blade can be cooled more sufficiently and uniformly, so that the cooling efficiency is improved.

The invention relates to a preparation method of a poly[2, 5-dyhydroxy-1, 4-phenylene pyridine diimidazole] polymer. The preparation method comprises two steps of prepolymerization reaction and post-polycondensation reaction. The reaction time of a prepolymer in a double-screw extruder is 10-60 minutes, and the double-screw extruder is provided with three temperature zones according to a sequence from a feeding port to a discharging port, wherein the temperatures of the tree temperature zones are respectively 160-180 DEG C, 180-190 DEG C and 190-200 DEG C. According to the preparation method, the double-screw extruder is used for carrying out the post-polycondensation reaction, and specific temperature and time are used for controlling parameters, so that the intrinsic viscosity [eta] of the PIPD polymer obtained in the end is 28-30dL/g, the molecular weight of the polymer is greatly increased, meanwhile, the stirring is facilitated, and the PIPD polymer can be easily conveyed and transferred to a spinning working section, thus the production efficiency is improved, and the production cost is reduced.

The present invention discloses an air duct structure of a dishwasher. The air duct structure comprises a first air duct and a second air duct which communicate with a containing cavity of the dishwasher. The first air duct is provided with a fan unit; under the action of the fan unit, air in the containing cavity is exhausted out of the dishwasher through the first air duct, gas outside the dishwasher enters the containing cavity from the second air duct, and an anti-backflow structure for preventing water or steam from flowing back from the containing cavity along the air duct is also arranged in the first air duct. According to the air duct structure of the dishwasher, a cross-flow fan is arranged in the first air duct, and the characteristics that the cross-flow fan is large in air volume and low in noise are utilized, so that the influence of the dishwasher on the surrounding environment is reduced; and meanwhile, the cross-flow fan adopts a use mode of exhausting air from the containing cavity, and is matched with the PTC heater arranged on the second air duct to exhaust the containing cavity to negative pressure, and a drying mode of feeding hot air from the second air ductis adopted, so that quick drying of the containing cavity of the dishwasher is realized.