30results about How to "Reduce the impact of airflow" patented technology

A film clamping device for double-film pressure-fixed film breaking and single-film impact film breaking relates to the field of high-supersonic-speed shock-wave wind tunnel engineering. The fill clamping device a levorotatory screw, a Laval nozzle, an open-mounted nut, a first adjusting ring and a gas vent; a through hole is arranged horizontally in the middle portion of the open-mouthed nut; the first adjusting ring is vertically and fixedly mounted at one end of the through hole of the open-mounted nut; the Laval nozzle is fixedly mounted in the external surface of the first adjusting ring along the axial direction of the through hole of the open-mounted nut; the levorotatory screw is fixedly mounted in the external surface of the first adjusting ring along the axial direction of the through hole of the open-mounted nut, and wraps the Laval nozzle; and the gas vent is arranged in the top of the open-mounted nut along the vertical direction, and is communicated with the upper surface of the open-mounted nut and the through hole in the middle of the open-mounted nut. Energy is transmitted from one end to the other end of a film rapidly during operation of a wind tunnel in a film breaking manner, especially the film clamping device can realize double-film pressure-fixed film breaking and single-film impact film breaking, and thus, different conditions of wind tunnel operation can be met at the same time.

The invention discloses an automobile exhaust pipe with a good silencing function, and belongs to the technical field of automobile parts. The automobile exhaust pipe comprises a main pipe, an intake pipe arranged at the front end of the main pipe, and a tail pipe located at the tail end of the main pipe, wherein a tail gas purifier is arranged between the main pipe and the tail pipe; a gas flow buffer plate and filter units are arranged in the main pipe; the gas flow buffer plate is arranged at the front end of the filter unit and located at the axis of the intake pipe; the gas flow buffer plate is hooked with the inner wall of the main pipe through a spring; the filter units are alternately distributed in a vertically-staggered manner along the transversal direction; two exhaust branch pipes are arranged on the tail pipe; and each exhaust branch pipe is of a double-layer structure, and uniformly-distributed silencing holes are formed in the tail end of the inner layer. According to the automobile exhaust pipe disclosed by the invention, the tail pipe is divided into the two exhaust branch pipes, thus the gas flow impact of a tail gas is greatly weakened; and meanwhile, the double-layer structure of each exhaust branch pipe is matched with the silencing holes in the tail end, thus the noise of the tail gas can be effectively lowered, and noise pollution is reduced. The automobile exhaust pipe disclosed by the invention is simple in structure, novel in design and great in market competitiveness.

A mixed flow fan comprises a motor, a casing, an impeller, guide vanes and a flow collector. The guide vanes are coaxially and fixedly arranged on the inner side of one end of the casing; the motor isarranged in the center of a hub of the guide vanes; an output shaft of the motor is fixedly connected with the center of the impeller; the flow collector is arranged on the inner side of the other end of the casing, and the flow collector and the impeller are on the same side; the hub of the guide vanes and the hub of the impeller have the same diameter. The variable concave-convex casing line provided by the invention is formed by tangency of a section of concave arc and a section of convex arc, so that the included angle between the inlet and the outlet and the rotating shaft is zero, meanwhile, a large diameter difference between the inlet and the outlet of the impeller can be ensured, and the airflow pressure is increased by fully utilizing centrifugal force. By the adoption of the design, the size of a non-acting area is reduced, airflow axially enters the non-acting area, energy is obtained in the impeller and converted into axial flow from inclined upward flow, then part of kinetic energy of the airflow is converted into pressure energy in the guide vanes, and airflow pressure is improved.

The invention relates to a double-layer current collector and a mixed flow fan provided with the double-layer current collector. The double-layer current collector comprises an outer layer current collector, an inner layer current collector and struts; and the inner layer current collector is coaxially arranged in the outer layer current collector, and the outer layer current collector and the inner layer current collector are connected through the multiple struts in the radial direction. The mixed flow fan based on the double-layer current collector comprises the double-layer current collector, an impeller, a wheel cover, guide vanes, a casing and a motor. The scheme is reasonable, the structure is simple, implementation is easy, and by means of the current collector, the advantages of the mixed flow fan can be sufficiently achieved.

The embodiment of the invention provides a sound production device and electronic equipment. The electronic equipment can comprise a mobile phone, a tablet personal computer, a notebook computer, a super mobile personal computer (UMPC), a handheld computer, an interphone, a netbook, a POS machine, a personal digital assistant (PDA), an automobile data recorder, wearable equipment, virtual realityequipment, Bluetooth sound equipment / earphones, vehicle-mounted front equipment and other mobile or fixed terminals with a loudspeaker function. A damping assembly is arranged and plays a role in decelerating the air flow formed in the rear sound cavity, so that the air flow formed in the rear sound cavity enters the cavity in the electronic equipment in a low-flow-speed state, the impact of the air flow on the thinner electronic equipment shell is weakened, the amplitude is reduced, the purpose of suppressing or reducing the shell vibration of the electronic equipment is achieved, and the experience of holding the electronic equipment by a user is improved.

The invention provides a flow-mixing fan with sine type meridional flow channels. The flow-mixing fan with the sine type meridional flow channels comprises a motor, a machine case, an impeller, guidevanes and a flow collector. The guide vanes are coaxially and fixedly arranged on the inner side of one end of the machine case. The motor is arranged in the center of wheel hubs of the guide vanes. The output shaft of the motor is fixedly connected with the center of the impeller. The flow collector is arranged on the inner side of the other end of the machine case. The flow collector and the impeller are on the same side. The wheel hubs of the guide vanes and wheel hub of the impeller share the same diameter. According to the flow-mixing fan with the sine type meridional flow channels, the scheme is reasonable, and the structure is simple and easy to achieve; full play can be given to advantages of the flow-mixing fan; and in addition, the fan structure is compact, the air volume is large, noise is little, and static pressure efficiency is high.

The invention aims at providing a ship hull manhole typhoon-resistant tooling device with simple structure, strong safety and convenient installation. The tooling device comprises a locking device, amanhole through which a person can enter the cabin and a manhole typhoon resistant tooling. The locking device comprises an annular vacuum concave sheet metal arranged on the periphery of the manhole,and the side wall of the annular vacuum concave sheet metal is provided with a first through hole. The first through hole is provided with a vacuum cover plate adapted to the first through hole, theaxis of the first through hole and the geometric center of the vacuum cover plate are positioned on the same straight line, a plurality of external bolts are arranged on the upper surface of the vacuum concave sheet metal, and the external bolts are adapted to the manhole typhoon-resistant tooling. The tooling device is applied to the technical field of manhole safety protection.

The invention discloses a high-temperature high-pressure plasticizing device which comprises a high-pressure stainless steel shell, wherein a through cavity is defined in the high-pressure stainless steel shell, end glands are arranged outside the end tips of the two ends of the through cavity, the part of the high-pressure stainless steel shell, corresponding to the bottom part of the middle part of the through cavity, is provided with an air inlet, the parts of the high-pressure stainless steel shell, corresponding to the bottom parts of the two ends of the through cavity, are provided with air outlets, the middle part in the through cavity is provided with an intake pressure uniform distributor communicated with the air inlet, the two end parts in the through cavity are provided with pressure relief exhaust distributors communicated with the air outlet, labyrinth seal assemblies are arranged between the intake pressure uniform distributor and the pressure relief exhaust distributors and between the pressure relief exhaust distributors and the end glands, the centers of the labyrinth seal assemblies and the end glands are provided with silk holes. By the adoption of the high-temperature high-pressure plasticizing device, the air flow compact on processed chemical cellosilk bundles can be reduced greatly and vibration quantity is lowered; meanwhile, steam leakage rate at pressure relief ends and the silk holes can be reduced effectively, internal pressure guarantee of the cavity is met, the distribution gradient of pressure and temperature in the cavity is realized.

The present invention relates to an inductively heated rutile single crystal growth furnace and a method for preparing rutile by using the same, and belongs to the field of single crystal growth, so as to solve the problem that temperature distribution is difficult to be controlled accurately, an axial temperature gradient below a crystal growth interface is large, and high stress is prone to occur in the crystal. The growth furnace comprises: a furnace housing divided into an upper cavity and a lower cavity; a first heating apparatus, comprising a conductive ceramic tube that is disposed in the upper cavity and that serves as a heating section, wherein the conductive ceramic tube is a feed channel of a feed inlet and the lower cavity, the conductive ceramic tube is externally sleeved with a quartz tube, and a first electromagnetic induction coil is wound around the quartz tube; a growth chamber disposed in the lower cavity, wherein a growth region of the growth chamber is disposed below the first heating apparatus; and a second heating apparatus, comprising a second electromagnetic induction coil that is disposed in an insulation layer of the growth chamber under a crystal growth region, and forming a temperature keeping section. According to the growth furnace and the method provided by the present invention, temperature can be changed more accurately, and a temperature gradient of crystal growth can be adjusted according to needs at any time.

The invention provides a tubular membrane sheet pore membrane aerator, which comprises a liner pipe, wherein a first connector similar to a cylinder is inserted into one end of the liner pipe, a through hole is formed in the first connector along the axial direction, a baffle is arranged in the middle of the through hole, the first connector is provided with a plurality of vent holes in the side,away from the liner pipe, of the baffle, internal threads are arranged at the end portion, on the same side as the vent hole, of the vent hole, the first connector is provided with a clamping block for connecting with a wrench in a clamped, the clamping block is provided with a plurality of clamping grooves penetrating in the axial direction of the first connector, the first connector is also provided with a first positioning ring and a check ring, a second connector similar to a cylinder is inserted into one end, far away from the first connector, of the liner pipe, is provided with a secondpositioning ring, and is provided with an end cover, the end cover is provided with a plurality of water discharge holes formed in the axial direction of the end cover, the liner pipe is sleeved witha tubular membrane sheet, the membrane sheet is provided with a plurality of aeration holes, and clamping hoops for fixing the membrane sheet, the first connector and the second connector are arrangedat the positions, corresponding to the first positioning ring and the second positioning ring, outside the membrane sheet. The tubular membrane sheet pore membrane aerator of the invention has advantages of good air tightness and the like.

The application discloses a restraining method of defrosting noise, a storage medium, a restraining device and an air conditioner. The restraining method comprises the following steps of when the airconditioner enters a defrosting mode, judging whether an auxiliary heating system of the air conditioner is opened or not; if yes, controlling the opening degree of a bypass electronic valve in a coolant loop of the air conditioner and the rotating speed of an indoor fan by a sectional type control strategy in first preset time, so that the opening degree of the bypass electronic valve and the rotating speed of the indoor fan are correlated and increased in a sectional manner; and if no, controlling the opening degree of the bypass electronic valve to be increased gradually to the maximum opening degree, and controlling the rotating speed of the indoor fan to be smaller than or equal to preset rotating speed. Therefore, when the air conditioner enters the defrosting mode, the opening degree of the bypass electronic valve can be increased gradually, air power noise can be effectively reduced, and when the auxiliary heating system is opened, the rotating speed of the indoor fan and the opening degree of the bypass electronic valve are controlled to be correlated, the defrosting noise of the air conditioner can be effectively restrained, and the user experience can be improved,

The invention provides an asymmetric type centrifugal impeller fan comprising a shell, an impeller and a motor. The impeller is installed in the shell and is connected with a motor output shaft so asto achieve rotation of the impeller. The impeller comprises a front wheel disc, a blade and a rear wheel disc which are connected sequentially in the axial direction of the impeller. The edge contourline of the end of the free end of the blade is an irregular curve for lowering rotation noise of the fan. The edge contour line of the end of the free end of the blade of the impeller is arranged tobe the irregular curve, thus when the impeller rotates, airflow forms different pulsed excitation at the end of the free end of the single blade, concentration frequency band noise generated due to single pulsed excitation superposition generated at the end of the free end of the blade is avoided, and the noise of the asymmetric type centrifugal impeller fan is lowered by about 5 dB compared withthe noise of a fan adopting a symmetrical type impeller of the same aerodynamic performance.

The invention discloses an automobile triangular warning sign, comprising a triangular frame formed by connecting three connection shafts in a circle; each connection shaft is sleeved with a warning sign body that is turnable; each connection shaft may drive the corresponding warning sign body to turn through an elastic reset structure; each of two connection shafts is provided with an extension portion, a fixing shaft is arranged between the two connection shafts and is movably sleeved with a support leg, and a support shaft is arranged between the two extension portions. The warning sign bodies that are turnable are provided herein, so that the automobile triangular warning sign experiences less impact of flow, and it is ensured that the automobile triangular warning sign may be stably placed on a road.

The invention discloses an exhaust gas bypass turbine machine with the turbine end being provided with a throat gas inlet mixing device. The exhaust gas bypass turbine machine comprises a turbine anda turbine shell, and a first throat, a second throat and a non-blade nozzle are arranged on the turbine shell. Before entering the turbine, turbine exhaust gas is mixed in the non-blade nozzle firstlyand then enters the turbine to work, thus the exhaust gas entering the turbine is even, and simultaneous impact on blades of the turbine is reduced. According to the exhaust gas bypass turbine machine with the turbine end being provided with the throat gas inlet mixing device, by designing different gas inlet mixing schemes on the turbine machine, under the situation that the through-flow characteristic of the turbine machine is guaranteed, airflow impact to the turbine blades is reduced, the reliability of the turbine and the turbine shell and the turbine machine efficiency are improved, andBPF noise of the turbine and thermal stress concentration of the shell are further lowered.

The invention relates to a piston sample rack for a gene gun. The piston sample rack is characterized by comprising a vertical cylinder with the two ends open; a piston is arranged on the inner wall of the cylinder in a sliding mode, and the piston is connected with a cup used for containing an acceptor material through a plurality of supporting rods arranged at intervals. A slide with holes is arranged at the bottom of the cup, and a frosted surface is arranged on the inner side of the slide. A plurality of through holes are formed in the part, above the cup, of the side wall of the cylinder. Sliding ways are arranged on the inner wall of the cylinder, and the piston and the sliding ways are connected in a sliding mode. A gap is formed between the cylinder and the cup. A supporting frame is arranged on the outer wall of the lower portion of the cylinder. A stretching-out end is arranged at the bottom of each sliding way. Scale mark values are arranged on the outer wall of the cylinder. By means of the piston sample rack, gas flow impact to the acceptor material can be relieved, the acceptor material is prevented from being blown off, and thus the hit efficiency of the gene gun is improved; the piston sample rack is simple in structure and convenient to use.

The invention provides a transmission mechanism for extension and retraction of a ceiling propeller of a low-altitude civil rotorcraft capable of vertical takeoff and landing. The transmission mechanism simply achieves extension and retraction of the ceiling propeller, adjusts the length of the ceiling propeller, adapts to normal takeoff of the low-altitude civil rotorcraft well, and reduces air impacts on two wings and the body of the aircraft when the low-altitude civil rotorcraft flies normally or enters a warehouse. The transmission mechanism comprises a base blade holder and is characterized in that base blades are arranged on the base blade holder and are sleeved with end blades; adjusting screw tubes are installed in the base blades; adjusting bolts matched with the adjusting screw tubes are arranged on the end blades; the adjusting screw tubes are connected to driven bevel gears; the driven bevel gears are meshed with a first transmission bevel gear; the first transmission bevel gear is connected to a transmission mandrel; the other end of the mandrel is connected to a second transmission bevel gear; a spline shaft is arranged corresponding to one end of the second transmission bevel gear and is sleeved with a sliding bevel gear; and the sliding bevel gear is meshed with the second transmission bevel gear during movement and is connected to a motor shaft and a clutch mechanism.

The invention provides a vertical lifting-falling low-altitude civil rotary-wing aircraft roof propeller structure having simple structure; a roof propeller is telescopic, the airflow impact on two aircraft wings and an aircraft body can be effectively reduced, and the flight safety of an aircraft can be ensured. The vertical lifting-falling low-altitude civil rotary-wing aircraft roof propeller structure is characterized by comprising a base propeller, wherein the base propeller is arranged on a base propeller seat, the base propeller is sleeved with an end propeller, the base propeller is internally provided with a regulating screw tube, and the end propeller is provided with a regulating bolt matched with the regulating screw tube.

The invention provides a heating and ventilation airflow silencer for constructional engineering. The heating and ventilation airflow silencer comprises a box body structure, wherein a reinforcing structure is mounted at the left end of the box body structure, an inlet structure is mounted at the left end of the reinforcing structure, an inner pipe structure is mounted in the box body structure, a noise elimination structure is mounted between the inner pipe structure and the box body structure, and an outlet structure is fixed at the right end of the box body structure. The inlet structure further comprises four sets of mounting heads and balance rings, wherein the mounting heads are mounted at the outer end of the reinforcing structure, the four sets of mounting heads are arranged in a circumferential array, the balance rings are hinged to each set of mounting heads, each balance ring is divided into an inner layer and an outer layer, and the balance rings are hinged to the mounting heads; and meanwhile, the inner-layer balance rings and the outer-layer balance rings are hinged to each other, so that the balance rings can be kept in a balanced state all the time, the mounted inlet structure can bear multidirectional external force, and the stabilizing effect of the inlet structure is guaranteed.