39results about How to "Reduce reflux" patented technology

The application discloses a liquid seasoning adding device, which belongs to the field of cooking machines. The liquid seasoning adding device comprises a liquid seasoning storage structure, a pump body structure, a liquid conveying pipeline and a dropping assembly. The liquid conveying pipeline is sequentially connected with the liquid seasoning storage structure and the pump body structure, and the liquid outlet end of the liquid conveying pipeline is connected with the dropping assembly. The dropping assembly is arranged above a frying pot body. The dropping assembly comprises a mounting shell, an interface plate and a rotary driving structure. A through groove is formed in the mounting shell, and the through groove is used for butt joint with an opening of the frying pot body. A seasoning adding opening is arranged on the side surface of the mounting shell, and the interface plate is arranged at the seasoning adding opening. The driving structure drives the interface plate to switch positions between the interface plate being located in the through groove and being located outside the through groove.

This utility model belongs to the field of machining, specifically a cutting fluid circulation filtration device, including a circulation tank; a feed inlet is fixedly connected to the top of the circulation tank; multiple sets of filter plates are fixedly connected to the inner side wall of the circulation tank; the filter plates are arranged in an array on the inner side wall of the circulation tank; multiple sets of linear motors are fixedly connected to the side wall of the circulation tank; the linear motors are located at the bottom of the filter plates; a first support rod is slidably connected to the side wall of the linear motor; a water pipe is fixedly connected to the side wall of the first support rod; a push plate is slidably connected to the side wall of the circulation tank; the push plate is located at the top of the filter plates; the sprayed liquid connected through the water pipe backwashes the filter plates, and the push rod drives the push plate to push away debris, which can effectively remove the debris accumulated on the surface of the filter plates, reduce the decrease in filtration efficiency caused by the clogging of the filter plate surface, and further increase the effect of circulation filtration.

The utility model discloses a flexible hoist, including middle part double channel shell, the bottom fixed connection base shell is connected below the middle part double channel shell, the top fixed connection of middle part double channel shell is discharged casing, the top fixed of discharge casing is equipped with the upper cover, the motor is fixed and is equipped with on the discharge casing, the motor is connected the driving gear through the belt, the base shell, discharge casing and the upper cover are equipped with a plurality of guide gear, the driving gear and the guide gear are engaged and are connected chain, the chain fixed connection hopper, the hopper is in each position opening at different positions, to reach the whole process of feeding, hoist, pour material, the whole process, transportation is stable, and the transportation process does not exist backflow, and soft pour, to reach the purpose of reducing backflow, reducing the broken rate.

The application discloses a kind of membrane separation concentrated water processing equipment, and the application relates to sewage treatment technical field.The membrane separation concentrated water processing equipment, including processing tank, agitating mechanism, impurity removal mechanism, agitating mechanism includes shaft and servo motor, the outer cylindrical surface of shaft and the top position of processing tank inner cavity close installation have defoaming assembly, the outer cylindrical surface of shaft and the bottom position of processing tank inner cavity close fixedly connected with stirring plate, impurity removal mechanism includes conical screen and collection component, conical screen surface middle is fixedly connected with lower conical extension ring, the surface of conical screen and the top position close fixedly connected with upper conical extension ring, the surface of lower conical extension ring and the surface of upper conical extension ring are all fixedly installed with guide vane, the middle of upper conical extension ring surface is fixedly installed with stirring tooth, reaches the purpose of impurity removal, can remove particulate impurities, and pharmaceutical and concentrated water are uniformly mixed, effectively treat sewage, safe and reliable.

The utility model relates to the technical field of lime kilns, in particular to a double-chamber lime kiln with good smoke discharge capacity, which comprises a lime kiln body, a gas pipeline, a smoke pipeline and an air pipeline, the gas inlet end of the gas pipeline is connected with the side wall of the lime kiln body, and the smoke pipeline connecting end of the smoke pipeline is connected with the side wall of the lime kiln body. The air inlet end of the air pipeline is connected with the side wall of the lime kiln body, the smoke pipeline connecting end is higher than the coal gas inlet end, and the air inlet end is lower than the coal gas inlet end. According to the utility model, through the position design of each pipeline on the lime kiln body, the gas inlet end is positioned above the air inlet end, so that the uniform mixing of gas and air is facilitated, the phenomenon of insufficient local combustion is reduced, better mixing of air and gas can be realized, and the combustion efficiency is improved; meanwhile, the flue gas pipeline connecting end is higher than the coal gas inlet end, so that flue gas can be smoothly discharged, and flue gas backflow is reduced.

The application discloses a double-fan-leaf suction-discharge structure of a centrifugal fan, and belongs to the technical field of centrifugal fans. The double-fan-leaf suction-discharge structure comprises an impeller, a volute, an air inlet, an air outlet, a motor, a connecting shaft, a bearing and a flow guide channel. The impeller is designed in a double-fan-leaf mode and comprises centrifugal blades and axial-flow blades. The impeller is located in the interior of the volute, and the interior of the volute is further provided with the flow guide channel. The application has novel design and ingenious device. The double-fan-leaf suction-discharge structure is arranged in the interior of the impeller shell and comprises centrifugal blades and axial-flow blades. The external gas is guided to enter the gap between the centrifugal blades in an orderly manner, the axial air suction capacity is improved, the phenomenon that the air pushed by the centrifugal blades overflows along the axial direction is inhibited, and thus the generation of backflow is reduced. The flow guide channel is arranged, the main channel changes from narrow to wide from the air inlet to the air outlet, the entering gas can be stably transported from the air inlet to the air outlet under the action of the main channel, the gas discharge efficiency is improved, and the discharge capacity is increased.

The utility model discloses an equipment of artemisia argyi essential oil distillation layered extraction belongs to artemisia argyi essential oil distillation technical field. An equipment of artemisia argyi essential oil distillation layered extraction, including distillation kettle and install the condensing tank body on the steam exhaust end of distillation kettle, the end surface of condensing tank body is equipped with air inlet and liquid discharge port respectively, and the circumference of condensing tank body is equipped with water inlet pipe and drain pipe respectively, still include: mounting piece, rotates and is installed in the condensing tank body, and mounting piece defines the condensing area, and the cross installation of spiral condensing pipe is arranged in the condensing area, and both ends of condensing pipe are communicated with air inlet and liquid discharge port respectively, and the outer periphery of the pipe wall of condensing pipe is provided with fin, the utility model discloses through condensing pipe cooperation fin uses, makes condensing pipe rotate in the condensing tank body, thereby makes steam fully with condensing pipe inner wall contact, avoids part steam difficultly fully contacts the effective heat exchange surface of condensing pipe, leads to steam and condensing pipe wall between heat exchange not enough fully, reduces the problem of condensing efficiency.

The invention relates to the technical field of smelting furnaces, and discloses a plasma cracking furnace which comprises a shell, the inner wall of the shell fixedly communicates with a water outlet pipe, the bottom of the shell fixedly communicates with a water inlet pipe, the outer wall of the shell is fixedly connected with a reduction bin, and the top of the reduction bin fixedly communicates with a collecting pipe. The bottom of the reduction bin is fixedly communicated with a first connecting pipe, the top of the reduction bin is fixedly communicated with an air inlet, the buffer bin is arranged in the shell, and a flow guide mechanism is arranged in the isolation bin. Gas obtained after combustible gas is recycled and combusted is guided into the collecting pipe through the backflow pipe, high temperature generated by cracking in the cracking furnace and carbon deposition in the collecting pipe are subjected to a reduction reaction, the concentration of the combustible gas is increased, the carbon deposition in the collecting pipe is reduced, meanwhile, the combustible gas of combustion supplementation components is collected and refluxed, secondary combustion is conducted, and the combustion efficiency is improved. And combustible gas generated in the cracking furnace is fully utilized.

This utility model discloses a condensate guiding structure for a drainage pipe, including a drainage pipe with an elbow at the top and a downward-facing drainage outlet. A guide rod is installed inside the elbow, with a height difference between its two ends. The lower end of the guide rod extends towards the drainage outlet, and the higher end connects to several branches, which have several contact points with the inner wall of the elbow. Condensed droplets on the inner wall of the elbow can flow along the branches to the guide rod and then along the guide rod towards the drainage outlet. The guide rod is installed inside the elbow via a movable frame. The branches are elastic, and the movement of the movable frame allows the branches to elastically abut against the inner wall of the elbow. This utility model uses a guide rod inside the drainage pipe to guide the condensed droplets out of the pipe, reducing the backflow of droplets.

The utility model discloses an air outlet grille and air conditioner with same, air outlet grille includes the end part muscle strip of extension along the first direction and first air guide muscle strip, and first air guide muscle strip is multiple and interval arrangement along the second direction, and the end part muscle strip is located the outermost side of multiple first air guide muscle strip, and the end part muscle strip and with its adjacent first air guide muscle strip between, adjacent first air guide muscle strip between all define the air outlet channel, and the first direction and the second direction intersect, the surface that the end part muscle strip participates in the definition air outlet channel includes first air guide surface and second air guide surface, and second air guide surface is located the air outlet side of first air guide surface, and in the second direction, second air guide surface is located the side of first air guide surface away from first air guide muscle strip. Through setting the second air guide surface away from first air guide muscle strip of first air guide surface, can reduce the airflow backflow, and reduce the contact of airflow and second air guide surface, thereby reducing the generation of condensation on second air guide surface.

The utility model discloses a multi-fermentation tank tail gas parallel exhaust system based on air pressure adaptive switching, which comprises a DCS (Distributed Control System) controller and a plurality of fermentation tanks, the upper end of each fermentation tank is provided with a pressure gauge and an exhaust pipe, the exhaust pipe is connected with a first exhaust branch pipe and a second exhaust branch pipe, the first exhaust branch pipe is connected with a tail gas exhaust header pipe, and the second exhaust branch pipe is connected with the tail gas exhaust header pipe. The first discharge branch pipe is connected with the high-pressure steam discharge header pipe, the second discharge branch pipe is connected with the high-pressure steam discharge header pipe, a first manual valve and a first automatic valve are arranged on the first discharge branch pipe, a second manual valve, a proportional electromagnetic valve and a second automatic valve are arranged on the second discharge branch pipe, and the DCS controller is connected with the pressure gauge, the first automatic valve, the proportional electromagnetic valve and the second automatic valve. The first discharge branch pipe is used for discharging micro-positive pressure gas; and the second discharge branch pipe is used for discharging steam. The DCS controller automatically switches the first automatic valve and the second automatic valve according to the pressure value detected by the pressure gauge, parallel discharge of micro-positive pressure gas and steam is achieved, and the pressure fluctuation range is smaller than or equal to + / -5%.

The application provides a driving method for quantum dot electrowetting electronic paper steady-state enhancement, which comprises applying a staged bipolar square wave driving voltage to the quantum dot electrowetting electronic paper and driving the ink opening process and the steady-state maintaining process of the quantum dot electrowetting electronic paper in stages, and adjusting the positive duty cycle of each stage to realize the adjustment of different opening states; wherein the staged driving comprises a starting stage, a transition buffer stage, a steady-state maintaining stage and a gray scale adjusting stage. The starting stage comprises applying a first bipolar square wave driving voltage to the quantum dot electrowetting electronic paper. The transition buffer stage is used for setting a zero voltage buffer between the starting stage and the steady-state maintaining stage. The steady-state maintaining stage is used for applying a second bipolar square wave driving voltage after the transition buffer stage. The gray scale adjusting step is used for adjusting the staged bipolar square wave driving waveform according to the target display state.

A bridge rectifier capable of improving insulation and voltage endurance capability relates to the technical field of semiconductors. Comprising a positive frame, a negative frame and an alternating-current frame, through the design of the frame structure and the layout, a plurality of uniformly distributed long round holes are formed in the area close to the glue inlet, the hole edges of the long round holes are of semicircular angle structures, the hole long axis direction is perpendicular to the main flow direction of a plastic package material, and the hole structures form a transverse turbulent flow barrier, so that stress can be guided to be transmitted in multiple directions; and compared with uniform radial diffusion of a circular hole, concentrated impact force can be decomposed into multiple strands of vortexes more effectively, and instantaneous impact on the frame is reduced. And meanwhile, the right-angle edge easily causes the molding compound to be cured in advance to form an insufficient filling area, the hole edge fillet design can reduce backflow of the molding compound, local pressure sudden change is avoided, and the filling uniformity is improved. On the premise that the thickness of the frame is not increased, the risks of deformation and insulation failure caused by plastic packaging stress are reduced.

This application relates to the field of condensate collection and reuse, and in particular to a condensate collection and reuse device, comprising a condensate collection system for receiving steam from the steam outlet of a dyeing and drying equipment and condensing the received steam to form condensate; a multi-stage recovery tank, including a primary recovery tank, a secondary recovery tank, and a tertiary recovery tank connected in sequence, with the output end of the condensate collection system connected to the primary recovery tank; a storage tank for storing the condensate; and a pumping mechanism for pumping the condensate from the tertiary recovery tank to the storage tank. This application has the effect of reducing water waste and environmental pollution.

The present application belongs to the technical field of water pump, and relates to a pump capable of increasing flow and pressure, comprising a pump body, a water inlet and a water outlet arranged on the pump body, an impeller and a water outlet cover arranged in the pump body and used for guiding pressurized fluid to the pump cavity, the water inlet and the inlet of the impeller being communicated through a flow channel body, the flow channel body comprising a throat pipe and a nozzle, the water outlet and the nozzle being respectively communicated with the pump cavity, the outer side of the nozzle being provided with a conversion turbine driven by a power device in two directions, the water pump being in a flow-increasing mode and a pressure-increasing mode respectively when the conversion turbine rotates in different directions, the conversion turbine driving fluid to flow in the opposite direction of the nozzle in the flow-increasing mode, and the conversion turbine driving fluid to flow in the direction of the nozzle in the pressure-increasing mode. The pump capable of increasing flow and pressure can select a high-flow mode or a high-lift mode according to actual requirements.

A motorcycle includes a frame, a body cover, a running system, a power system and a heat dissipation system. The body cover includes a front shield, the heat dissipation system includes a radiator and a heat dissipation fan, the heat dissipation fan is located behind the radiator, and the front shield is located below the radiator. The front shield includes a plurality of guide vanes spaced apart from each other in sequence from top to bottom, a ventilation groove is formed between adjacent two guide vanes, the guide vane includes a first section and a second section arranged along the length direction of the guide vane, the second section is located below the first section, the first section and the second section each have a first surface facing rearward and a second surface facing forward, and the first surface and the second surface are each inclinedly arranged; along the length direction of the frame, the front edge of the first surface is closer to the lower side than the rear edge thereof, and the front edge of the second surface is closer to the lower side than the rear edge thereof. In this way, the hot air can be guided to flow forward and downward, so that the probability of the hot air being re-sucked by the heat dissipation fan under the idling condition can be reduced, and the heat dissipation efficiency can be improved.

The utility model discloses a gas separation reflux device for hydrogen production by water electrolysis, and belongs to the field of hydrogen production by water electrolysis. Comprising a switch valve and a first needle valve used for adjusting the flow rate of liquid, the switch valve and the first needle valve are sequentially connected through a communicating pipe, a diaphragm is connected beside the switch valve, and the diameter of the diaphragm is larger than that of the communicating pipe used for connecting all parts. And a switch valve is arranged at the rear end of the diaphragm and is used for controlling the backflow of the electrolyte. The diameter of the diaphragm is 1-5 cm larger than that of the communicating pipe. The rear end of the first needle valve is connected with a second needle valve. The needle hole diameter of the first needle valve and the needle hole diameter of the second needle valve can be adjusted to be 0.3-0.8 mm, and the first needle valve and the second needle valve are used for further controlling the backflow speed of the electrolyte. The gas separation reflux device for hydrogen production through water electrolysis can achieve the effects of being simple in structure and effectively reducing the concentration of hydrogen in oxygen in a post-treatment system.

The utility model discloses an axial flow impeller and belongs to the field of impellers. One end of each protrusion is connected into the hub in a sleeved mode; the annular connecting pieces are connected with the other ends of the bulges; the through holes are formed between the annular connecting piece and the adjacent bulges; the connecting ring is sleeved in the annular connecting piece; and the blades are connected outside the hub. The plurality of small sharp wings are connected to the tops of the blades at intervals. And the triangular groove-shaped structure is connected to the tail edge part of the blade. And the grooves are formed in the roots of the blades. The hub, the protrusions, the annular connecting piece and the blades are connected in an integrated injection molding mode. The utility model has the technical effects that the noise can be reduced conveniently, and the heat dissipation performance is good.

The application discloses a scroll compressor dynamic and static disc structure, which comprises a dynamic disc and a static disc, the static disc is sleeved with the dynamic disc, and the static disc is above the dynamic disc; a top surface center of the static disc is provided with an exhaust port; a bottom surface of the dynamic disc is sequentially provided with a first lower scroll line, a first middle scroll line and a first upper scroll line from bottom to top, the thickness of the first lower scroll line, the first middle scroll line and the first upper scroll line is gradually reduced; a top surface of the static disc is sequentially provided with a second upper scroll line, a second middle scroll line and a second lower scroll line from top to bottom, the thickness of the second upper scroll line, the second middle scroll line and the second lower scroll line is gradually reduced; when the static disc is sleeved with the dynamic disc, a fourth spiral step edge of a lower end of the second middle scroll line is in abutment with a first spiral step edge of an upper end of the first lower scroll line and forms a lower compression cavity, a third spiral step edge of a lower end of the second upper scroll line is in abutment with a second spiral step edge of an upper end of the first middle scroll line and forms a middle compression cavity, and a lower surface of the static disc is in abutment with an upper end surface edge of the first upper scroll line and forms an upper compression cavity.

The utility model discloses a reinforced concrete outer wall connecting structure relates to building engineering technical field, the utility model discloses a grouting sleeve one side below is connected with first outer tube through grouting mouth, and first outer tube one side top is connected with grouting joint, and first outer tube inside below places the spring, and spring top place has the push frame, and the push frame top place has the sealing bead, and first outer tube inner ring is connected with the guide ring, the utility model discloses a grouting sleeve one side top is connected with second outer tube through the row of grout mouth. The utility model discloses the setting of first outer tube, spring, sealing bead and guide ring, when grouting operation, the slurry is guided after the top slope of guide ring, and the pressure concentrated effect is in sealing bead, and the sealing bead is driven to move down and drives the push frame compression spring, after stopping grouting, the spring releases the force storage drive push frame and moves up, makes sealing bead and guide ring bottom slope accurate adhesion and blocks, effectively reduces the slurry reflux phenomenon, and the filling fullness of grouting sleeve inside slurry is promoted with the help.

This invention provides a flow-limiting device, comprising a support, a fixed membrane, a movable membrane, and a side membrane. The fixed membrane surrounds the inner side of the support and is fixedly connected to the support. The movable membrane can axially approach or move away from the fixed membrane. The side membrane connects the fixed membrane and the movable membrane and has multiple connecting holes. The opening area of ​​the connecting holes can be adjusted according to the fluid flow, allowing the flow-limiting device to switch between a first state, a second state, and a third state. In the first, third, and second states, the distance between the movable membrane and the fixed membrane gradually decreases, and the opening area of ​​the connecting holes gradually decreases. When the flow-limiting device is in the third state, it can reduce rapid blood reflux, thus limiting blood flow and reducing the probability of tissue necrosis caused by excessively rapid blood reflux.

This application relates to the field of fan technology, disclosing a fan and a range hood. The fan includes: a volute casing, including annular walls; and an impeller located inside the volute casing. In the axial section of the fan, the annular walls bulge towards the side away from the axis, and the outer annular wall surface of the impeller also bulges towards the side away from the axis. This improves the fan's airflow and air pressure output capacity, increases energy efficiency and air volume, and reduces noise.

A fan impeller is disclosed to address the problem of turbulence generated by existing fan impellers. It includes: a hub having a top plate and a ring wall connected to the top plate, the ring wall surrounding a circumferential portion; a first blade group having a plurality of first blades connected to the circumferential portion; and a second blade group having a plurality of second blades connected to the ring wall, the second blades not connected to the circumferential portion, the second blade group located between the ring wall and the first blade group. This invention also relates to a cooling fan. This can improve airflow efficiency and reduce noise.

The application discloses a juicing screw, which comprises a pressing part, a plurality of spiral ribs are arranged on the outer circumferential surface of the pressing part, a spindle-shaped boost rib is arranged between two adjacent spiral ribs, the two ends of the boost rib are arc-shaped and the width of the boost rib is smaller than the width of the middle part, and the boost rib is symmetrically arranged between the two adjacent spiral ribs in the direction of the interval width of the spiral ribs. According to the application, the outer circumferential surface of the juicing screw is provided with a plurality of spiral ribs, a spindle-shaped boost rib is arranged between two adjacent spiral ribs, the boost rib applies an additional radial force to the material through the gradually changed curved surface profile, the material is forced to move forward, the backflow or stagnation is reduced, the juicing efficiency is improved, the large material is divided through the shunting effect, the large material is guided to enter the extrusion area uniformly, and the risk of material blockage is reduced.

The application discloses a steam pipeline cutting machine with a positioning function, and relates to the cutting technical field.The steam pipeline cutting machine with the positioning function comprises a cutting device.The steam pipeline cutting machine with the positioning function has the following advantages: the pipeline enters from one side of a conveyor, the pipeline is moved to one side of a circular saw through the conveyor, so that the automatic conveying of materials is realized, manual supporting and moving are reduced, the pipeline is in contact with a limiting mechanism in the conveying process, the shaking space of the pipeline is reduced, excessive shaking in the conveying process is avoided, the subsequent cutting effect is prevented from being affected, the pipeline is clamped through a positioning device, so that the pipeline is fixed, the cutting quality is improved, shaking in the cutting process is avoided, a servo motor controls a screw rod to ascend and descend in a machine body, so that the height of the circular saw is controlled, and the circular saw is easy to produce chippings and gas in the cutting process; the chippings are cleaned and collected through a processing device, and the safety hidden danger is reduced.

The utility model discloses a multi-petal grab bucket, and relates to the technical field of grab buckets, the multi-petal grab bucket comprises a grab bucket body, the grab bucket body is rotatably provided with a plurality of bucket petals, the grab bucket body is provided with a plurality of fixing seats, the fixing seats are rotatably provided with driving parts, and the output ends of the driving parts are rotatably connected with one ends of the bucket petals to drive the bucket petals to rotate; the grab bucket body comprises a hollow column, an oil tank is arranged in the hollow column, a plurality of communicating grooves are formed in the side wall of the hollow column in the circumferential direction in a penetrating mode, heat dissipation plates matched with the communicating grooves in a one-to-one correspondence mode are arranged on the outer side wall of the hollow column, and the heat dissipation plates communicate with the interior of the hollow column and are provided with a plurality of heat dissipation grooves. The oil tank is arranged in the hollow column, the oil tank can be protected conveniently, the communicating groove in the side wall of the hollow column is matched with the heat dissipation plate and the heat dissipation groove on the outer side, the interior of the hollow column can be communicated with outside air, heat in the hollow column can be dissipated easily, and therefore the temperature of the oil tank is reduced; and the problems that the viscosity of hydraulic oil in the oil tank is reduced and the transmission efficiency of a hydraulic system is reduced due to high temperature are solved.

The invention belongs to the technical field of medical instruments, and relates to a thrombus blockage prevention infusion pump which comprises a pump body, an infusion pipeline and a main control assembly, the pump body is provided with a pipeline clamping groove, an operation panel and an installation cavity, the infusion pipeline is installed in the pipeline clamping groove in a matched mode, and the main control assembly is fixed in the installation cavity. The operation panel is electrically connected to the main control assembly, and the main control assembly is used for basic infusion control and simple signal feedback; the anti-thrombus infusion pump further comprises a mechanical anti-thrombus mechanism, a pipeline sealing and fixing assembly and an auxiliary supporting assembly, and the mechanical anti-thrombus mechanism and the pipeline sealing and fixing assembly are both installed on the pump body and matched with the infusion pipeline. Wherein the mechanical anti-thrombus mechanism comprises a pulse type mechanical liquid pushing piece and a pipeline micro-vibrator mechanism, and the pipeline micro-vibrator mechanism is integrated on the inner wall of a pipeline clamping groove; the system has the effects of precise thrombus monitoring, active intervention, intelligent adjustment and blockage reduction.

A new type of single-casing slurry pump includes a shaft frame with a rotating shaft rotatably mounted inside. A flange is fixedly connected to one end of the shaft frame, and a protective sleeve is fitted onto the flange. Bolts are installed between the protective sleeve and the flange. Four impellers are fixedly mounted at the head of the rotating shaft, with the impeller inlet extending forward. The outer diameter of the back blade is smaller than the diameter of the cover plate. The impellers are located inside the protective sleeve, and a guide block is provided on the end face of the protective sleeve, slightly lower than the height of the cover plate, suitable for waterless sealing scenarios. The bearing assembly uses a mature lubrication structure, prioritizing synthetic grease to ensure bearing stability. The waterless sealing design solves the leakage problem of traditional seals, extending the maintenance cycle by more than 30%. The four impellers and optimized guide blocks improve pump efficiency by 5%-8%, and offer superior cavitation resistance compared to similar products. The back blades and the guide block on the protective sleeve reduce localized wear, extending the life of flow components by more than 20%, improving overall practicality.

This application belongs to the technical field of air extraction equipment, specifically an electric air extraction pump, including a main unit and an impeller. The end of the main unit has an air inlet structure that connects to the air inlet channel. The impeller includes a shaft and multiple blades arranged around the shaft. The root end face of each blade has a recessed portion extending from the air inlet side of the impeller to the air outlet side, so that a recessed area is formed around the periphery of the shaft on the air inlet side of the impeller. By setting the recessed portion at the root of the blade, the recessed portions of each blade are combined to form an annular recessed area on the air inlet side of the impeller near the shaft. Therefore, when the impeller rotates, the air inlet space can be expanded, the air volume can be increased, and the extraction efficiency can be improved. By setting the recessed portion at the root of the blade near the shaft, the flow space can be expanded directly in the initial area where the airflow enters, avoiding the obstruction of the airflow by the blade root, allowing the air to flow more smoothly to the center of the impeller and reducing flow resistance.

The application discloses a bogie bottom drag reduction cladding plate and a high-speed train bogie, and the cladding plate comprises a torsion bar cladding plate for cladding a torsion bar of a bogie frame, a first cladding plate for connecting a cross beam on one side of the torsion bar, and a second cladding plate for connecting a cross beam on the other side of the torsion bar. The first cladding plate and the torsion bar cladding plate form a first flow guide slope, the second cladding plate and the torsion bar cladding plate form a second flow guide slope, and the flow guide directions of the first flow guide slope and the second flow guide slope are symmetrically arranged. The application guides the airflow originally acting on the region near the center pin hole and the torsion bar to the lower side of the torsion bar cladding plate, optimizes the partial cladding and flow guide of the originally complex and abrupt bottom profile near the center pin hole and the torsion bar, forms a relatively continuous bottom flow guide surface, weakens the direct interference between the airflow and the complex components of the bottom, reduces the local flow separation, backflow and vortex intensity, improves the bogie bottom flow field distribution, and further achieves the purpose of reducing the aerodynamic drag of the bogie region.