30results about How to "Increase flow strength" patented technology

The invention discloses a hybrid unit of an SCR (selective catalytic reduction) system for vehicle urea, comprising a pipe body, a hybrid unit rib device and a nozzle, wherein the nozzle is aslant arranged on the wall surface of the pipe body; the hybrid unit rib device tightly abuts against the nozzle and is installed on the front end of the nozzle; the hybrid unit rib device comprises four ribs, the middle of the first rib and the second rib forms a fluid path similar to an atomizing pattern; the first rib and the second rib have certain gradient and twists towards the central area; the third rib has a baffle-shaped structure and is arranged near the pipe wall, the installation direction is vertical to the atomizing axis, and the third rib twists towards the wall surface; and the fourth rib is arranged along the atomizing axis direction and is composed of a group of blades alternately twisted left and right. The invention can bring the effect that a urea aqueous solution injected by the nozzle and tail gas are fully mixed before entering an SCR catalytic converter, thus reducing urea crystallization formed on the wall surface; and meanwhile, the hybrid unit has compact structure and is easy to process and install, and the effect of the hybrid unit is verified.

The invention relates to a fuel cell metal bipolar plate and a manufacturing method thereof, and belongs to the technical field of proton exchange membrane fuel cells. In the structure of the bipolarplate provided by the invention, the circular holes are distributed in the ridge of the cathode flow field, so the transmission of reaction gas and generated water under the ridge is facilitated, thedissipation of reaction heat at the ridge is also facilitated, the current density and the distribution uniformity thereof are improved, and meanwhile, the performance and the service life of a fuel cell are improved; inclined grids are evenly distributed on the two sides of the cathode flow field groove, so part of unreacted gas passing through the flow field ridge is forced to flow into the cathode flow field groove, the part of gas flowing into the cathode flow field groove plays a role in gas blocking, namely a backpressure role, on reaction gas originally flowing through the cathode flowfield groove, and the current density of the fuel cell can be improved.

The invention discloses a pulse electric field-traveling wave magnetic field composite method for reducing the cracks of a cladding layer. The devices used in the method comprise a laser cladding numerical control device, a traveling wave magnetic field device and a positive and negative pulsed electric field device. During the cladding process, a traveling wave magnetic field is applied to a molten pool, so that the charged quantity of the non-magnetic particles and the charged particles in the molten pool is increased under the action of impressed current, the liquid metal particles are remarkably enhanced in Lorentz force in an external follow-up traveling wave magnetic field, the stirring effect on a molten pool is enhanced, the effects of fluid scouring, crushing and the like on dendrites are increased, the grain size is reduced, the fine grain strengthening effect is obvious, the defects, such as air holes, inclusions, component segregation, etc., are reduced, and the crack generation probability of a cladding layer is reduced. The composite device effectively solves the problems that the non-magnetic and charged particles are subjected to small Lorentz force in an electromagnetic field, and the electromagnetic stirring effect of the magnetic field on the molten pool is small.

The invention discloses a shell-and-tube point discharge solid-liquid phase change enhanced heat transfer device based on electrofluid mechanics and belongs to the technical field of solid-liquid phase change enhancement. The problem that the speed of the phase change process cannot be adjusted through an existing passive enhancing technology is solved. The shell-and-tube point discharge solid-liquid phase change enhanced heat transfer device comprises a metal outer pipe and a plurality of composite inner pipes arranged in the metal outer pipe; phase change materials are filled between the metal outer pipe and the composite inner pipes; the metal outer pipe is grounded; and a heat insulation layer is arranged on the outer wall of the metal outer pipe; each composite inner pipe comprises ametal inner pipe, a plurality of groups of fins arranged outside the metal inner pipe and an insulating layer arranged on the inner wall of the metal inner pipe; direct-current positive voltage is connected into the metal inner pipes; and a heat source circulates in the metal inner pipes. Compared with the existing passive enhancing technology, due to the fact that the electric heating convectionintensity in a flow field is directly affected by the potential difference between polar plates, the speed of the phase change process can be actively controlled by adjusting the input voltage of an anode plate. After an electric field is applied, the flow intensity can be remarkably enhanced, and a good phase change enhancing effect is obtained.

The invention discloses an oil-filled heater. The oil-filled heater comprises two oil tubes and a plurality of cooling fins, wherein the two oil tubes are distributed vertically in a spaced mode; and the two ends of each cooling fin are arranged on the two oil tubes correspondingly, an oil channel communicating with the two oil tubes is formed in each cooling fin, and air chambers, a distance away from the corresponding oil channel, are formed in one or more side edges of each cooling fin; a top air outlet is formed in each air chamber, and air inlets are formed in all opposite side walls of the air chambers; and a guide plate used for guiding air into the corresponding air chamber is arranged in each air inlet. By adoption of the oil-filled heater, the cooling areas of the edges of the cooling fins can be enlarged, the flow intensity of air on the inner surfaces and the outer surfaces of the cooling fins is enhanced, the temperatures of the edges of the cooling fins are increased, the cooling capacity of the cooling fins is improved, and the danger that a user is scalded in the use process of the oil-filled heater is avoided.

The invention discloses a direct-current electric field-traveling wave magnetic field composite method for improving the quality of a cladding layer. The devices adopted by the method mainly comprisea laser cladding numerical control device, a traveling wave magnetic field device and a direct-current electric field device. According to the composite device, firstly, the direct-current power supply device is started before cladding until the cladding is completed, and secondly, a traveling wave magnetic field is applied to a molten pool during the cladding process, so that the charged quantityof non-magnetic particles and particles with less charges in the molten pool is increased under the action of impressed current. Furthermore, in an external follow-up traveling wave magnetic field, the Lorentz force borne by the liquid metal particles is remarkably enhanced, the stirring effect on a molten pool is enhanced, the effects of fluid scouring, crushing and the like on the dendrites areincreased, the grain size is reduced, the fine grain strengthening effect is obvious, the structure defects of a cladding layer are reduced, and the quality is improved. The composite device effectively solves the problems that the non-magnetic and charged particles are subjected to small Lorentz force in an electromagnetic field, and the electromagnetic stirring effect of the magnetic field on the molten pool is small.

The invention discloses a graphite electrode heating device which comprises a box body and a motor arranged on one side of the box body. A groove is formed in one side of the box body, and a rotatinghole is formed in the inner wall of the side, close to the motor, of the groove. A rotating shaft is welded on an output shaft of the motor, one end of the rotating shaft penetrates through the rotating hole and extends into the groove, and a sleeve is welded on the end of the rotating shaft. A first belt pulley is fixedly sleeved on the outer side of the rotating shaft. Stand columns are welded on the inner wall of the top side and the inner wall of the bottom side of the groove, and circular columns are horizontally and rotationally arranged on the ends, close to each other, of the two standcolumns. Second belt pulleys are fixedly sleeved on the outer sides of the circular columns, and a same belt is arranged on the two second belt pulleys and the first belt pulley in a transmitting mode. The graphite electrode heating device has the advantages of reasonable design and high practicability and is convenient to drive a sleeve to rotate. Moreover, the flow intensity of air in the groove can be increased through a fan blade, so that a graphite electrode in an electrode placing slot can be fully in contact with the air in the groove, and the temperature rising rate of the graphite electrode is increased.

The invention discloses a CO2 rectification separation and purification device with high purification rate, wherein the device comprises a rectification tower; the top of the rectification tower is communicated with an upper gas outlet pipe; one end, far away from the rectification tower,of the upper gas outlet pipe is communicated with a condenser, a liquid outlet of the condenser is communicated with an upper return pipe, and the liquid outlet of the condenser is communicated with an upper discharge pipe; and the bottom of the rectification tower is communicated with a lower liquid outlet pipe, one end, far away from the rectification tower, of the lower liquid outlet pipe is communicated with a reboiler, and an air outlet of the reboiler is communicated with a lower return pipe. When an arranged rotating shaft rotates, a rotary frame can be driven to rotate, heavy liquid in the rectification tower from top to bottom falls into the rotary frame, light gas from bottom to top blows open a small gas cap through a small vent hole, then the light gas makes contact with a heavy liquid, light substances and heavy substances in the rectification tower are mutually exchanged; and in addition, the light gas and the heavy liquid can be in full contact with each other through the rotating rotary frame, and the rectification effect is improved.

The invention discloses a laundry sheet slurry main-auxiliary two-stage stirring mixing apparatus. According to the laundry sheet slurry main-auxiliary two-stage stirring mixing apparatus, various components of the effective components of a laundry sheet to be mixed are placed into a material box, a main stirring shaft belt wheel drives a stirring main shaft to rotate after the apparatus is started, the slurry forms anterior-posterior circulation through the main stirring shaft while a stirrer set drives the belt wheel to act, a four-blade rotation plate rotates, a suspending column material hopper is immersed into the slurry, the slurry is collected, the former suspending column material hopper leaves the liquid level of the material box and the next suspending column material hopper enters the slurry, a secondary stirring shaft motor drives a secondary stirring shaft to perform high speed rotation so as to stir the slurry of the suspending column material hopper, and the slurry overflows from the cavity on the other end of the suspending column material hopper and falls onto the other side of the main stirring shaft inside the material box. According to the present invention, with the laundry sheet slurry main-auxiliary two-stage stirring mixing apparatus, the problems of low efficiency, high labor intensity and low automation degree of the traditional laundry sheet slurry mixing equipment are solved while the automated production line is conveniently formed, and the advantages of simple operation and high stirring quality are provided.

The invention discloses a micro-reaction channel structure, a micro-reactor based on the micro-reaction channel structure and a nano-material synthesis system, and can overcome the defects that an existing micro-reactor is long in reaction distance, poor in operability and the like. The reaction mixing efficiency can be flexibly regulated and controlled; and based on the strong liquid mixing effect, a nano material synthesis system is constructed. According to the design working scheme, the micro-reaction channel structure comprises a micro-channel with the characteristic scale ranging from 0.005 mm to 2 mm, a certain number of spine structures are arranged on the inner wall or in the middle of the micro-channel, spines such as petals and roots in a flower gather together, and leaf tips are unfolded in the circumferential direction. The spines with the roots gathered together form a microstructure. According to the nano-material synthesis system constructed based on the micro-reaction channel, multiple chemical reagents needed for synthesizing the nano-material are completely mixed through the micro-reaction channel for multiple times, the mixed liquid is led to a target site where the nano-material needs to be synthesized, and the nano-material is formed after post-treatment such as heating and drying.

The invention discloses a seam-like welding-traveling wave magnetic field composite method for improving the defects of a cladding layer. The adopted devices mainly comprise a laser cladding numericalcontrol device, a traveling wave magnetic field device and a seam-like welding device. According to the present invention, firstly, the seam-like welding device is started before cladding until the power is continuously supplied for a period of time after cladding is completed, and secondly, a traveling wave magnetic field is applied to a molten pool during the cladding process, so that the charged quantity of non-magnetic particles and particles with small charged quantity in the molten pool is increased under the action of impressed current, in an external follow-up traveling wave magneticfield, the Lorentz force borne by the liquid metal particles is remarkably enhanced, then the stirring effect of a molten pool is enhanced, the number of crystal grains is increased, the fine grain strengthening is remarkable, the cladding layer structure defects are reduced, and the quality is improved. According to the method, the problems that the non-magnetic particles with small electric charge amount are subjected to small Lorentz force in the electromagnetic field, and the electromagnetic stirring effect of a magnetic field on a molten pool is small are effectively solved, and meanwhilethe defects that in the prior art, the refining effect is not remarkable only by enhancing the magnetic induction intensity of the magnetic field, and the pre-heating before melting and slow coolingdevices after melting are needed to be additionally arranged, are overcome.

The invention discloses a strengthened micro cyclone separator and a high-pressure separation device with the separator. The strengthened micro cyclone separator comprises an outer pipe and an inner pipe. Part of the lower portion of the inner pipe enters the upper portion of the outer pipe. Guiding vanes are arranged between the inner pipe and the outer pipe. An opening between the outer pipe and the inner pipe is a cyclone separator inlet. The outer pipe and the inner pipe are connected through the guiding vanes. The 3-6 guiding vanes are in the spiral line type and are arranged in the circumferential direction of the outer wall of the inner pipe in the same direction and evenly distributed. According to the high-pressure separation device with the separator, a partition plate, the structure, the arrangement mode and the fixing method of the high-pressure cyclone separation device are designed at the same time. The efficient, energy-saving and long-period-running high-pressure separation device is established. Complete separation of gas, liquid and solid in gas, liquid and solid mixtures of the inlet is achieved, and the resistance loss is far smaller than the pressure loss of an existing conventional high-pressure separation device.