84results about How to "Avoid swirls" patented technology

Disclosed herein is a fan and shroud assembly comprising: a fan having a hub rotating on a shaft and a plurality of blades extending outward from the hub; and a shroud surrounding the fan for controlling air blast by rotation of the fan, wherein the shroud comprises: a guide ring part spaced apart at a predetermined interval from the periphery of the fan which connects ends of the blades; and swirl preventing means formed on the guide ring part for preventing swirling airflow along the periphery of the fan connecting the ends of the blades. The fan and shroud assembly can minimize generation of swirling airflow and backflow and provide improved noise-reduction effect.

The invention discloses a cooling system used for an ultra-high strength steel plate thermal die cutting and forming die. The die comprises a concave die and a concave die seat; a water chamber is arranged between the concave die and the concave die seat; the water chamber is communicated with a water inlet and a water outlet. The water chamber is arranged between the concave die and the concave die seat of the invention; after cooled water is inlet in the water chamber, a steel plate workpiece can be quickly cooled by the thermal conduction between the die and the steel plate so as to meet the quenching condition of the steel plate. Especially, the water chamber is also internally provided with a supporting column; the upper end of the supporting column is contacted with the lower bottom surface of the concave die; the lower end of the supporting column is contacted with the upper bottom surface of the concave die seat; therefore, the structural strength of the concave die is ensured, the flowing direction of the water flow can be guided, flow perturbation conditions can be provided, meanwhile, the heat transfer area is increased, and the heat exchange efficiency between the cooled water and the die is improved.

There is provided a combustor comprising a fuel nozzle which is comprised of a rodlike body which has a fuel passage and which is located in an air passage; a plurality of hollow members which are connected to the fuel passage and which extend in radial directions from the rodlike body into the air passage; at least one injection port formed in each hollow member to inject a fuel from the fuel passage into the air passage; and a projection which extends from a farmost inner wall of each hollow member that is most distant from an axis of the rodlike body to the injection port that is most distant from the axis. A hole for leaking fuel that is connected to an air passage may be formed in a farmost inner wall of the hollow member that is more distant from an axis of a rodlike body than the injection port that is most distant from the axis, or may be formed to be adjacent to all the injection ports on an upstream or downstream side in the direction of the airflow. Thus, a vortex does not occur in the hollow column.

A propeller shaft PS1 comprises a front pipe member 10 and first and second yoke members 20 and 30, which are attached to both the ends of the front pipe member 10. The first yoke member 20 is attached by press-fitting a first yoke fitting portion 23 into the inner circumferential part at the left end of the front pipe member 10 until the front end of the front pipe member comes near a stopper portion 24. The second yoke member 30, which has no stopper portion, is attached by press-fitting a second yoke fitting portion 33 into the inner circumferential part at the right end of the front pipe member 10. When a compressive force greater than a predetermined force acts axially, while the first yoke fitting portion 23 is prevented from being further inserted by the stopper portion 24, the second yoke fitting portion 33 is press-fit further into the inner circumferential part of the front pipe member, which is thereby expanded and destroyed.

The invention relates to flue-dust processing equipment. According to the equipment, dust is introduced into a stirring barrel loaded with water through a hollow rotation vertical pipe, and dust introduced into water is filtered and dissolved in water through stirring and cutting of a rotation blade, a fixed porous filter balance plate and a rotation cutting sheet, and thus absorption purification effect is reached. The equipment is simple and reasonable in structure design, material-saving, low in cost, convenient to use and efficient for dedusting, and for a production manufacturer, production cost is reduced, energy is saved and environment is protected. The equipment is suitable for purification processing of various metal and nonmetal dust, and can be popularized and used in a large scale.

A sludge harvester for removing a concentrated nutrient sludge from a sludge pond includes a frame, one or more wheels or skids attached to the frame, means for gently breaking up at least a portion of the sludge layer adjacent to a dilute layer, and means for capturing at least a portion of the broken up sludge layer. The organic sludge product recovered by the harvester has a higher nutrient concentration as compared to alternative methods because of minimized mixing of the sludge and dilute layers during collection of the organic sludge product. The organic sludge product captured by the harvester can be applied directly to agricultural land or used in the production of a certifiable organic or other fertilizer.

The invention discloses a condenser. The condenser comprises a cylinder body with openings at both ends and an undercooling device, wherein the cylinder body is provided with a refrigerant inlet by which a gas phase refrigerant is introduced, and a refrigerant outlet which forms an offset angle with the vertical direction of the cylinder body; one end of the cylinder body is hermetically connected with a first communication tube, and the other end of the cylinder body is hermetically connected with a water tank; the first communication tube is communicated with the water tank inside the cylinder body through a first heat exchange tube bundle to form a cycle refrigerating device which is used for cooling the gas phase refrigerant inside the cylinder body to form a liquid phase refrigerant;the undercooling device is positioned inside the cylinder body, is positioned below the first heat exchange tube bundle, is hermetically communicated with the refrigerant outlet and is used for receiving the liquid phase refrigerant to make the liquid phase refrigerant form an undercooling liquid phase refrigerant; and the undercooling liquid phase refrigerant is led out of the condenser through the refrigerant outlet. The condenser can reduce the injection volume of the refrigerant inside the condenser, can reduce the height of a supporting device connected with the condenser and is convenient to assemble and disassemble for users.

The invention discloses a centrifugal fan impeller capable of adjusting splitting vanes, and aims at solving the problems that the common working conditions of a current fan product in use do not match with the rated working conditions, thus the service efficiency of a fan is low, and the efficient operation range of the fan is reduced. The centrifugal fan impeller capable of adjusting the splitting vanes is characterized in that a circular guide ring and a wheel disc form a revolving pair; a main fixing frame which is provided with a circular guide ring fixing device is fixed to the wheel disc; the circular guide ring is connected to n upper fixing devices for the circular ring and the splitting vanes; the splitting vanes are connected to a wheel cover through upper fixing devices for the wheel cover and the splitting vanes, and the splitting vanes are connected with the wheel disc through upper fixing devices for the wheel disc and the splitting vanes; each upper fixing device for the circular ring and the splitting vanes is connected to the corresponding upper fixing device for the wheel disc and the splitting vanes through a splitting vane adjusting part. According to the centrifugal fan impeller, the circular guide ring can be rotated to drive the splitting vane adjusting parts to swing so as to adjust the angles of the splitting vanes, thus the maximum operation efficiency can be obtained according to different working conditions, and the maximum operation efficiency which can be achieved only under the rated working conditions can be obtained by a centrifugal fan under the off-rating conditions.

A gas turbine device in which the low frequency vibrations or the low frequency noises during the low load operation can be effectively suppressed with no increase of the pressure loss of the exhaust gas being triggered includes a gas turbine engine provided with an exhaust diffuser forming an upstream portion of an exhaust gas passage, an exhaust strut provided in the diffuser (20), and a swirling flow blocking plate. The swirling flow blocking plate is disposed on a downstream side of the exhaust strut in the exhaust gas passage so as to extend in an axial direction.

The invention discloses a flow distribution device which comprises a flow distributor which is of a concave structure, wherein by virtue of the concave structure, a flow distribution cavity having an opening is formed; the flow distributor is arranged inside a pressure container in a hung mode and is located just below a nuclear reactor core; the opening of the flow distributor faces the nuclear reactor core; a central hole is additionally formed in the center of the bottom of the flow distributor in a penetrating mode and is formed just below the nuclear reactor core; a plurality of shunt holes are additionally formed in the flow distributor in a penetrating mode; under the actions of the central hole and the shunt holes, coolant can uniformly and stably flow into the nuclear reactor core, and the coolant is effectively prevented from generating a vortex under the action of the central hole, so that the uniformity and the stability of coolant flow distribution are further improved; meanwhile, since the vortex is prevented from generating, the safety and the reliability of the nuclear reactor are guaranteed and the probability of nuclear safety accidents is reduced. In addition, the invention also discloses a nuclear reactor component with the flow distribution device.

A filter vessel for accommodating a filter insert made of water-permeable material and fillable with coffee grounds. The filter vessel includes a bottom; and side walls upwardly extending from the bottom and spreading outwardly. The bottom includes at least two openings through which a filtrate can pass. The bottom includes a separating element in a central region of the bottom. The separating element divides a region above the bottom into two approximately equal sized drainage chambers. Each drainage chamber includes at least one of the at least two openings for discharging the filtrate.

The invention discloses an aerostatic thrust bearing comprising a bearing body, wherein the upper part of the bearing body is provided with an air inlet, a ring slot, an orifice and an air cavity, wherein the orifice is communicated with the ring slot; an included angle between the wall surface of the air cavity and an orifice axis is an orifice jet divergence angle theta which can avoid the inherent edge corner vortex problem of the traditional square or round air cavity; the change of the shape of a runner on the air cavity is utilized to alleviate pressure loss caused by overquick air speed increase and maintain high pressure in a bearing gas, thereby improving bearing carrying capacity and stability; and the orifices are communicated by a pressure equalizing slot to enhance the bearing carrying capacity and stability. The aerostatic thrust bearing is mainly used for designing moving parts in equipment, such as photoetching machines, three dimensional measuring machines and the like and belongs to the technical field of ultra-precise movement and ultra-precise measurement.

The apparatus has a closed housing (4, 29), one side of the housing (4, 29) being the filling side (13), which, during filling of the container (2), is located opposite an introduction opening (6) provided in said container. The housing (4) has a filling tube (3, 33) passing through it axially in relation to the axis of the introduction opening (6), said filling tube, on the filling side (13), protruding to such an extent that, in the filling position, projects into the introduction opening (6). The interior of the housing (4, 29) is connected to an external arrangement for extracting dust by suction, and the filling side (13) has an air-inlet opening. In respect of the process, for the purpose of filling the container (2), the filling side (13) of the housing (4) is positioned above the introduction opening (6) of the container (2) such that a gap (a) is produced between the filling side (13) and the introduction opening (6), and the arrangement for extracting dust by suction is set in operation at least during filling of the container (2).

Disclosed is a minimally invasive intervention-type artificial heart axial flow blood pump. The minimally invasive intervention-type artificial heart axial flow blood pump is used for assisting in blood circulation of a failing heart. The blood pump comprises a front catheter, a sleeve, a pump body and a micro motor, wherein the pump body and the micro motor are arranged in the sleeve, the micro motor is fixed on the sleeve, and the pump body comprises a rotor hub, rotor blades, a rear guide vane hub and rear guide vane blades. The blood pump is mainly characterized in that the gradually-varying inner diameter is adopted, the minimum sectional area of the gradually-varying inner diameter is the same as the sectional area of a flow field area in the middle of a rotor, and the rotor hub is connected with the rear guide vane hub through a tooth-shaped sealing structure. Under the condition that the sectional area of the flow field of the rotor area is basically unchanged, the energy loss caused by the change of the sectional area of the flow field is effectively reduced, so that the working efficiency of the blood pump is improved. Meanwhile, invasion of blood cells in gap areas is avoided, the problem that damage to the blood cells in the gap areas of the rotor hub and the rear guide vane hub of an existing minimally invasive intervention-type axial flow blood pump is large is solved, which remarkably enhances the reliability of the blood pump accordingly.

The invention discloses a rotary cleaning device for production of a roller shaft seat and a one-way wheel of a fax machine. The rotary cleaning device comprises supporting legs, wherein a support table is fixedly connected to the top of the supporting legs; a first support rod is fixedly connected to the lower surface of the support table; a first motor is fixedly connected to the middle of the first support rod; an output shaft of the first motor is fixedly connected with a first rotating shaft through a coupling; and a driving wheel is fixedly connected to the surface of the first rotatingshaft. According to the rotary cleaning device for production of the roller shaft seat and the one-way wheel of the fax machine, the effect of cleaning the surfaces of the roller shaft seat and the one-way wheel is achieved; a second rotating shaft and a third rotating shaft rotate to drive cleaning brushes to scrub and clean the surfaces of the roller shaft seat and the one-way wheel; meanwhile,as the outer surface of a driven gear meshes with that of a driving gear, the rotating direction of the third rotating shaft can be changed, swirling is prevented, and accordingly, the problem that acommon roller shaft seat and one-way wheel cleaning device has high probability of causing retention of oil dirt and impurities is effectively solved.

The invention relates to the field of candy producing equipment and especially relates to a sugar boiling pot for producing candies. The sugar boiling pot includes a kettle body, a material feeding inlet, a support bracket, a heating sleeve tube, a steam inlet, a steam outlet, a first stirring mechanism, a second stirring mechanism, a viscosity sensor, a temperature sensor, a control apparatus, a first driving apparatus, a second driving apparatus, a display apparatus and a thermal insulating layer. The viscosity sensor and the temperature sensor are arranged in the kettle body. Signal output terminals of both the viscosity sensor and the temperature sensor are controlled to the control apparatus. The control apparatus drives the first driving apparatus or the second driving apparatus to control rotation speeds of the first stirring mechanism or the second stirring mechanism respectively. By means of arrangements of the viscosity sensor and the temperature sensor in the kettle body, situation in the kettle body can be monitored at any time. The viscosity sensor and the temperature sensor send detected signals to the control apparatus so that the control apparatus can control rotation speed of corresponding variable-frequency motors by controlling the first driving apparatus or the second driving apparatus, thereby achieving an energy-saving object.

The invention discloses a pressure casting method for multi-stage uniform accelerated injection of liquid metal, which comprises three stages of low-speed injection, high-speed injection and pressurization and pressure maintaining, and comprises the following step: determining the initial injection speed, critical speed and critical acceleration of the liquid metal according to the parameters of apressure chamber and the fullness of molten metal after the low-speed injection stage and before the high-speed injection stage. A low-speed injection stage is divided into 3-9 acceleration stages, an injection punch performs uniform acceleration advancing according to the speeds of the 3-9 acceleration stages to reach the critical speed, so that liquid metal is prevented from splashing out of asprue gate to seal the sprue gate of a chamber, and thus, stable laminar flow motion of molten metal in the pressure chamber is achieved, turbulence and vortexes are avoided, air in the pressure chamber can be exhausted through a pouring gate system and a die; and the whole pressure chamber is filled with molten metal, so that the phenomena of air entrapment and oxide inclusion are avoided, air holes and oxide inclusion of castings are reduced, and the performance of the castings is improved.

The invention belongs to the technical field of sepsis, and discloses a kit for rapid detection of sepsis. The kit comprises a plastic box body, wherein the inner of the plastic box body is slidably connected with a pulling plate; the front surface wall of the pulling plate is provided with a handle, and the pulling plate is provided with an installation groove, a first clamping groove and a second clamping groove; the installation groove is arranged at one end of the first clamping groove and the second clamping groove; the second clamping groove is arranged on one side of the first clampinggroove; a chip groove and an external temperature detector are arranged in the installation groove; two symmetrical airbags are arranged on a bottom side plate of a chip box; the bottoms of the two airbags are pasted on the bottom side plate to form a plane capable of storing the chip box and a processor; and the indoor temperature is convenient to detect by the external temperature detector and is displayed through a displayer, so that the indoor temperature is convenient for users to watch, and the affection due to the fact that the indoor temperature is too high or too low of the accuracy of kit detection is avoided.

A turbomolecular pump includes a plurality of alternatively axially arranged one behind another, rotor and stator discs (8,9) provided with blades (10), with the blades (10) located in vicinity of the high vacuum side (2) having a blade angle (α) that is steeper than blade angle (α) of the blades (10) located in vicinity of the vacuum side (3), and with the blade angle (α) of the blades (10) located in the vicinity of the vacuum side (3) amounting to less than 8°.