43results about How to "Improve the flow field" patented technology

The invention discloses a dynamic and static ring structure of a coal mill, relates to the field of coal mills, and solves the problems that an existing dynamic and static ring structure of the coal mill is fixed in structure, large in size, not convenient and fast to disassemble and assemble and poor in sealing effect when in use, the dynamic and static ring structure of the coal mill comprises a mounting disc, a dynamic ring mechanism and a static ring mechanism, the movable ring mechanism comprises inner baffles, outer baffles, arc-shaped plates and fixing pieces, the static ring mechanism comprises a static ring body, a sealing ring and a driving piece, the movable ring structures composed of the inner baffles, the outer baffles and the arc-shaped plates are spliced to form the whole movable ring, and the inner baffles are fixed through the fixing pieces at the initial stage of forward rotation of the mounting disc; when the mounting disc rotates reversely, the fixing state of the fixing piece on the inner baffle is relieved, the dismounting efficiency is improved, and when the outer baffle rotates, the driving piece drives the sealing ring to move downwards, so that the sealing ring can be kept in the state of tightly abutting against the top face of the outer baffle.

The utility model relates to the technical field of axially split pumps, in particular to an axially split pump impeller with offset blades and an axially split pump. The axially split pump impeller with the offset blades comprises a front cover plate, a hub, a plurality of long blades and a plurality of short blades, the hub is arranged in the front cover plate, and the long blades and the short blades are arranged between the hub and the front cover plate; the multiple long blades are evenly arranged around the axis of the impeller, and the short blades are arranged between every two adjacent long blades. Projections of one end, far away from the axis of the impeller, of each long blade and one end, far away from the axis of the impeller, of each short blade in the axial direction of the impeller are distributed on the circumference of the same circle; each short blade is provided with a pressure face and a suction face which are opposite. According to the axially split pump impeller with the offset blades, the flow field in the blade channels can be improved, the pressure gradient of an outlet of the impeller can be greatly reduced, the wake flow area of the outlet of the impeller is reduced, and smooth transition of the speed and pressure from the wake flow area to a jet flow area is achieved.

The invention belongs to the technical field of engine nozzles, and relates to a design method, device and equipment of an ultra-high-speed non-ideal gas nozzle and a medium. The method comprises the steps that design parameters are obtained, a non-sticky molded surface and a contraction section of the ultra-high-speed non-ideal gas spraying pipe are designed, and a flow field of the ultra-high-speed non-ideal gas spraying pipe is obtained; carrying out computational fluid mechanics simulation on the flow field by adopting a computational fluid mechanics method, and calculating the boundary layer thickness of the ultra-high-speed non-ideal gas nozzle; according to the thickness of the boundary layer, a non-sticky molded surface and a contraction section of the ultra-high-speed non-ideal gas spraying pipe are redesigned, the thickness of the boundary layer is corrected, and an updated flow field is obtained; performing computational fluid mechanics simulation on the updated flow field by adopting a computational fluid mechanics method to obtain an updated flow field simulation result; and when it is judged that the updated flow field simulation result meets the preset requirement, the current ultra-high-speed non-ideal gas spraying pipe is output. The ultra-high-speed non-ideal gas spray pipe can be accurately designed.

The invention discloses an SCR (Selective Catalytic Reduction) denitration system which comprises an SCR denitration tower, and a flue guide plate, a flue gas pre-mixer, a main ammonia spraying grid, an ammonia-smoke turbulator, a main catalyst layer, a supplementary ammonia spraying grid and a supplementary catalyst layer are sequentially arranged in the SCR denitration tower in the flue gas circulation direction; the main ammonia spraying grid comprises a plurality of first ammonia spraying branch pipes which are arranged in parallel at equal intervals in the direction perpendicular to the flue gas circulation direction, a row of first nozzles and a row of second nozzles are obliquely arranged on each first ammonia spraying branch pipe in the length direction, the number of the nozzles in each row is multiple, and the first nozzles and the second nozzles are arranged in a staggered mode and face different directions; each ammonia spraying branch pipe is communicated with the ammonia supply pipe, and an ammonia gas control valve is arranged on each first ammonia spraying branch pipe. Through cooperative use of the main ammonia injection grid and the supplementary ammonia injection grid, ammonia escape is reduced, uniform injection of ammonia gas in the whole reaction space is realized, and it is ensured that ammonia escape is maintained at a reasonable level.

The invention relates to the technical field of clothes treatment, in particular to clothes treatment equipment. The problems that an existing thread scrap filtering device is prone to causing air duct blockage, the drying efficiency is reduced, and then the user experience is affected are solved. Therefore, the clothes processing equipment comprises a box body, a drum door pivotally connected with the box body, a thread scrap removing device, an outer drum, an inner drum and a drying air duct, the outer drum, the inner drum and the drying air duct are arranged in the box body, the thread scrap removing device is installed on the drum door and located on the inner side of a window screen of the drum door, and under the condition that the drum door is closed, the thread scrap removing device can remove thread scraps. The thread scrap removing device is located in the box body and abuts against and is spliced with the front air duct of the drying air duct, so that the front air duct communicates with the inner barrel through the thread scrap removing device; and the thread scrap removing device is arranged to be capable of filtering the drying airflow flowing from the inner barrel to the front air duct so as to separate thread scraps in the drying airflow and collecting the thread scraps. The clothes processing equipment is high in drying efficiency and good in user experience.

According to the casting powder, the preparation method of the small high-carbon steel square billet and the generated small high-carbon steel square billet, a relational expression of the carbon content of a steel grade, the section of a casting blank, the pulling speed and the slag consumption of the casting powder is established, the appropriate pulling speed is matched according to different carbon contents and section sizes, and through accurate control over the slag consumption of the casting powder, adding and consumption of the casting powder reach dynamic balance. By optimizing the electromagnetic stirring position and parameters of the crystallizer, the water quantity of the crystallizer and the round corner of the copper pipe, the flow field and the temperature field in the crystallizer and the corner cooling condition are improved, and corner cracks caused by supercooling of the corners of the small high-carbon steel square billet are effectively solved.

The utility model discloses an electromagnetic stirring tundish impact area guard plate which is composed of a left guard plate and a right guard plate, the sides, close to molten steel, of the left guard plate and the right guard plate are the outer sides, the sides, away from the molten steel, of the left guard plate and the right guard plate are the inner sides, and the included angle A between the outer side plate faces of the left guard plate and the right guard plate and the horizontal plane is smaller than 90 degrees; each of the left protective plate and the right protective plate comprises a head-section protective plate, a first arc-shaped transition connecting section, a middle-section protective plate, a second arc-shaped transition connecting section and a tail-section protective plate; one end of the first arc-shaped transition connection section is connected with the head section protection plate, the other end of the first arc-shaped transition connection section is connected with the middle section protection plate, one end of the second arc-shaped transition connection section is connected with the middle section protection plate, and the other end of the second arc-shaped transition connection section is connected with the tail section protection plate; mounting grooves are formed in the outer side faces of the head section protection plates in the longitudinal direction, and the left protection plate and the right protection plate are connected with connecting pieces located between the head section protection plate of the left protection plate and the head section protection plate of the right protection plate in a clamped mode through the mounting grooves respectively. The induction coil can be protected in the impact area, the molten steel flow field in the tundish impact area is improved, and molten steel scouring is relieved.

The utility model provides a fan shell assembly and a range hood comprising the same, a fan shell comprises a front cover, a rear cover and an annular wall, the front cover and the rear cover are provided with through holes along the axial direction of the fan shell, and two sides of the annular wall are connected with the front cover and the rear cover to form a smoke exhaust channel. A cavity surrounded by the smoke exhaust channel and used for containing the fan and the impeller is further arranged in the fan shell, a smoke inlet of the fan for sucking smoke is located on one side of the front cover, and at least one protruding part outwards in the radial direction of the annular wall is arranged on the annular wall. The wall surface, close to the rear cover, of the annular wall is provided with at least one bending plane which inclines inwards in the radial direction of the annular wall. According to the fan shell assembly and the range hood comprising the fan shell assembly, the outward protruding part and / or the inward bent plane are / is arranged on the annular wall, so that an annular wall structure with a variable cross section is formed, a flow field in a fan shell is improved, airflow impact is reduced, airflow stability is improved, noise is reduced, and a user has better use experience.

The invention discloses a marine empennage, which relates to the technical field of ships, and comprises a ship shell of a wave-shaped flat bottom structure, and the upper end of the ship shell is fixedly connected with a deck used for covering the space in a ship and horizontally dividing the space into layers; the side, close to a deck, of the hull is fixedly connected with a cabin used for storing materials and allowing sailors to work and live, the outer wall of the side, away from the cabin, of the hull is fixedly connected with an empennage plate body used for keeping course stability and providing rotation or trim adjusting capacity, and dynamic wingspan expansion mechanisms are arranged on the two sides of the upper end of the empennage plate body. An arc wing guide swing mechanism is arranged at the center of the upper end of the empennage plate body, a trapping screen wing mechanism is arranged on one side of the tail end of the empennage plate body, plate wings and an electric telescopic rod are matched with each other, and the stress area of the empennage can be increased by improving the sailing performance and expanding the wingspan; therefore, larger lift force is generated under the condition of the same wind speed or water flow.

The invention relates to the technical field of nuclear fuel assembly design, and particularly discloses a foreign matter capturing unit, a foreign matter capturing structure and a nuclear fuel lower pipe seat, the foreign matter capturing unit comprises a separation plate, and a lower guide seat and an upper guide seat which are respectively fixed at the lower end and the upper end of the separation plate; the separating plate is vertically arranged, the two sides of the lower guide base extend outwards to form a lower base outer arc guide face and a lower base inner arc guide face respectively, and the two sides of the upper guide base extend outwards to form an upper base inner arc guide face and an upper base outer arc guide face respectively. A first foreign matter capturing space is defined by the lower base outer arc guide face, the separation plate and the lower guide base. The guide surface of the foreign matter capturing unit adopts the arc-shaped upstream face, so that the local hydraulic loss in the coolant circulation process is effectively reduced, and a better coolant flow field is ensured.

The utility model discloses an electromagnetic stirring tundish induction coil protection piece which comprises an impact area protection plate and a pouring area protection plate, and an electromagnetic stirring tundish induction coil is located in a space defined by the impact area protection plate and the pouring area protection plate. The casting area protection plate comprises a first head section, a first arc-shaped connecting section and a first tail section; the impact area protection plate comprises a second head section, a second arc-shaped connecting section, a transition connecting section, a third arc-shaped connecting section and a second tail section. The tundish can protect the induction coil, improve a molten steel flow field in the tundish and reduce molten steel scouring.

The utility model provides a wear -resisting anticorrosion dispersion disc structure, including dispersion disc base, the dispersion disc base top center position fixedly be equipped with the central connecting axle, the central connecting axle outer end surface fixedly be equipped with a plurality of annular array distribution's main dispersion tooth, dispersion disc base bottom fixedly be equipped with a plurality of annular array distribution's oblique dispersion vane, oblique dispersion vane is inclined. This scheme has realized high hardness and excellent chemical corrosion resistance through the single layer, dense, high -performance alloy coating of covering all key work surface, has realized high -efficient multistage dispersion and uniform mixing of material, has promoted product quality and production efficiency through the synergistic effect of main dispersion tooth, oblique vane, deflector and optional superposition disc subassembly simultaneously, produced strong impact, shear, axial circulation and complex turbulence.

The invention relates to a horizontal tank stirring tank and a stirring method thereof. The horizontal tank stirring tank comprises a tank body erected on the ground, the top of the tank body is open, and the bottom of the tank body is arc-shaped and provided with a discharge port; cavities are formed in the side wall and the bottom wall of the tank body, temperature control structures are contained in the sides, close to the inner wall of the tank body, of the cavities, heat preservation materials are contained in the sides, close to the outer wall of the tank body, of the cavities, the temperature control structures are arranged on the inner wall of the tank body in a winding mode layer by layer at intervals, and the inner bottom wall of the tank body is bent outwards and extends to form recesses which correspond to and penetrate through the intervals of the temperature control structures. A stirring structure is rotationally connected in the tank body and comprises a spirally extending stirring roller, sealing structures are arranged at the two ends of the stirring roller and rotationally connected to the tank body, a driving structure is arranged at one end of the stirring roller, a plurality of ridges corresponding to the inner side wall of the tank body extend from the outer edge of the stirring roller, and cavities are formed between the ridges; the cavity can be communicated with a recess formed in the inner bottom wall of the tank body. The device has the effects of improving the contact between materials in the tank body and the temperature control system, improving the circulation efficiency and improving the heat exchange rate.

The invention belongs to the technical field of aircraft environment control, and discloses a high-pressure-ratio and high-rotating-speed centrifugal compressor impeller and vaned diffuser joint optimization design method, which comprises the following steps of: calculating by using a one-dimensional theory according to a compressor design index to obtain basic geometric parameters of a compressor impeller and a vaned diffuser; the method comprises the following steps: respectively selecting an initial blade root molded line, a blade middle molded line and a blade tip molded line as design optimization objects, and connecting from a blade root to a blade tip by using a smooth curve; according to the scheme, the initial blade molded line and the diffuser guide blade molded line are optimized, complete impeller and vaned diffuser models are obtained, performance calculation is conducted on the obtained N compressor models, and a combination with the optimal efficiency and the optimal pressure ratio is selected as the final scheme of the impeller and the diffuser of the compressor. By means of the design method, the designed impeller can adapt to the flow change of the gas compressor in a large range, so that the operation stability of the gas compressor is improved, and the surge margin of the gas compressor is widened.

The utility model discloses a multichannel heat dissipation casing structure of inflator pump, concretely relates to inflator pump technical field, including the shell, is provided with the inflator pump main part outside the shell, and the output fixedly connected with the air outlet pipe of inflator pump main part, the top fixedly connected with two positioning frame of shell, the fixedly connected with the handle of positioning frame inboard, handle inboard and air outlet pipe outside sleeve joint, the fixedly connected with two supports of inflator pump main part bottom, the fixedly connected with the bottom plate of support lower surface, the fixedly connected with a plurality of cushion block of bottom plate bottom, the fixedly connected with the air intake mechanism of bottom plate inboard, the top is provided with the heat dissipation mechanism of shell. The utility model utilizes a plurality of trapezoidal air inlet cover to accelerate airflow flow and enhance the penetrating power, improve internal air flow field, reduce ventilation resistance, combine top inclined top cover, heat conduction fin and opening design simultaneously, effectively discharge hot air, avoid heat accumulation, optimize the heat dissipation air duct, realize uniform heat dissipation, maximize the fan air volume and reduce airflow waste.

The utility model provides a replaceable plate bundle unit full welding plate type gas-gas heat exchanger, a plurality of single plate bundle units respectively constitute high temperature plate bundle unit and low temperature plate bundle unit, and the high temperature plate bundle unit and low temperature plate bundle unit are sealedly installed on the support bottom pry in proper order, and the lower part of the support bottom pry is connected with the bottom connection header; the hot side import header, hot side export header are sealedly installed in the upper portion of high temperature plate bundle unit and low temperature plate bundle unit respectively; the cold side import header, cold side export header are sealedly installed in the end of high temperature plate bundle unit and low temperature plate bundle unit, and the outside of high temperature plate bundle unit and low temperature plate bundle unit is sealedly connected with the outer pressure plate, in the utility model, if single plate bundle unit occurs corrosion or premature failure damage, single plate bundle unit can be replaced on the spot, and the subsequent maintenance cost of equipment is reduced, and simultaneously through setting the flow guide plate, gas scale is reduced, the flow characteristics of gas medium in the heat exchanger is strengthened, heat exchange efficiency is increased, and long period stable operation of equipment is ensured.

The present invention discloses a multi-zone coupled high-efficiency dust removal dry-type electrostatic precipitator, the dry-type electrostatic precipitator comprises an inlet horn, a cover body and an outlet horn, a plurality of electric fields are sequentially arranged inside the cover body, an anode plate and a cathode wire are arranged inside each electric field, dust collecting grids are arranged inside the inlet horn and the outlet horn, the dust collecting grids are formed by evenly arranged multiple groups of bent grids, multiple groups of bent grids are arranged along the flue gas direction, and the upper and lower ends of each group of grids are installed in the inlet horn and the outlet horn through a vibrating frame. The multi-zone coupled high-efficiency dust removal dry-type electrostatic precipitator of the present invention optimizes the existing electrode plates, electrode wires, inlet and outlet horn smoke boxes, flow fields and other aspects of the electrostatic precipitator, which can improve the capture efficiency of smoke, reduce secondary dust, and further reduce the smoke concentration at the outlet of the electrostatic precipitator; the multi-zone coupled high-efficiency dust removal dry-type electrostatic precipitator of the present invention has low investment, does not occupy space or occupies a small space, has low resistance, low energy consumption, and significant efficiency improvement effect.

The present invention discloses a high-speed impeller pump and its impeller, wherein the impeller comprises a hub and a plurality of bionic blades, wherein the plurality of bionic blades surround the outer periphery of the hub, and each of the bionic blades is bent in the same direction into a V-shape in the radial direction. The blades of the impeller of the high-speed impeller pump of the present invention are designed with reference to the bionic blades of bird wings, which can not only optimize the flow field and reduce noise, but also improve the order noise of the air pump, which is more conducive to the comfort and pleasure of the human ear. The high-speed impeller pump of the present invention is a side groove pump structure, and adopts bionic blades with a V-shaped structure. Compared with a straight blade pump, the outlet airflow is smoother, and the outlet total pressure distribution of the bionic blade pump is better, which is significantly greater than the outlet total pressure of the existing straight blade pump. The high-speed impeller pump has the advantages of compact structure, small size, light weight, and low noise.

The present invention relates to a chain grate coal-fired boiler flue gas treatment device and method, the device comprises a reaction tower, one side of the reaction tower is provided with a flue gas inlet, the top of the reaction tower is provided with a flue gas outlet, the reaction tower includes SO X Absorption spray layer, NO X Acidification spray layer, nitric acid absorption spray layer, coordinated dust removal device, flue gas inlet is located at SO X Below the absorption spray layer; at the bottom of the reaction tower there is a SO X Absorption tank, NO X Acidification tank, NO X Absorption tank, SO X Absorption tank, NO X Acidification tank, NO X The absorption tank is connected to SO X Absorption spray layer, NO X Acidification spray layer and nitric acid absorption spray layer are connected; SO X A flue gas liquid holding plate is also provided between the lower part of the absorption spray layer and the flue gas inlet. The chain grate coal-fired boiler flue gas treatment device and method of the present application removes NOx, SOx and smoke pollutants in one tower, with small engineering workload and high removal efficiency, meeting national air emission standards.

The utility model creatively provides an ultrasonic fluid measuring device which comprises a measuring tube, two groups of ultrasonic transducers and at least one group of reflecting devices are arranged in the measuring tube, the ultrasonic transducers and the reflecting devices are arranged along the length direction of the measuring tube, the reflecting devices are arranged between the two groups of ultrasonic transducers, and the reflecting devices are arranged on the measuring tube. The reflection device can reflect ultrasonic waves of one group of ultrasonic transducers to the other group of ultrasonic transducers; the utility model has the advantages that the problem of low measurement precision caused by short ultrasonic measurement sound path distance in ultrasonic fluid measurement can be solved, the measurement precision is high, and the device is easy to manufacture and assemble.

The present invention provides a smoke hood and a range hood, and relates to the technical field of kitchen appliances. A guide block is arranged on the top wall of the smoke hood, and the guide block is arranged on the inner side of the top wall. The distance between the side surface of the guide block away from the top wall and the inner wall of the top wall is not less than the distance that the reinforcement part protrudes relative to the inner wall of the top wall. The present invention improves the flow field of the airflow through the guide block arranged therein, shortens the flow path of the airflow, and reduces the possibility of the airflow generating vortex at the reinforcement part position, thereby reducing the aerodynamic noise and improving the noise environment of the range hood when absorbing and exhausting oil smoke.

This invention relates to the field of medical blood purification equipment technology, and discloses a lipid adsorption material regeneration device, including a main body, a rotary switching module, an adsorption column module, a dynamic pressure balancing system, a fluid pipeline system, and a main controller. The rotary switching module drives the adsorption column module to switch between three stations: treatment, regeneration, and balancing preparation. The adsorption column module is filled with pH-responsive hydrogel material to achieve adsorption and regeneration functions. The dynamic pressure balancing system forms a magnetic circuit through a magnetic piston and electromagnetic drive components in a bypass pipe, which senses and adjusts the pressure inside the column in real time. The fluid pipeline system controls the connection of input and output connectors via an electric push rod to achieve fluid switching. The main controller integrates data from multiple sensors, including pressure, pH, and optical sensors, to intelligently terminate the regeneration process. This invention achieves in-situ online regeneration of the adsorption material, continuous uninterrupted treatment, and precise closed-loop control, improving treatment efficiency and safety, and significantly reducing consumable costs.

The utility model discloses a terminal outlet structure of an inner lifting pipe. The terminal outlet structure comprises an inner lifting pipe barrel body, an inner lifting pipe end socket and a regular cone outlet square box, the inner lifting pipe end socket is fixedly connected to the top of the inner lifting pipe barrel; and the regular cone outlet square box is radially or tangentially arranged outside the top side of the inner lifting pipe barrel. The device is simple, reliable and economical in structure, oil gas and a catalyst enter the coarse cyclone separator slowly after being rectified by the inclined divergent flow channel formed by the inner lifting pipe barrel and the regular cone outlet square box, a medium flow field is greatly optimized and relieved, excessive catalyst fine powder formed by beating and breaking of the catalyst due to sudden change of the flow field of the flow channel is avoided, and the service life of the catalyst is prolonged. And the possibility of reducing the solid content in the oil slurry is provided, so that the service life of the oil slurry pump can be ensured.

The invention discloses an ion exchange device for removing heavy metals from oyster peptides, and belongs to the technical field of continuous electric regeneration ion exchange. It comprises a lifting base frame and a dialysis chamber fixedly installed on the upper surface of the lifting base frame, a positive power generator is fixedly installed at one end position of the outer surface of the dialysis chamber, and a negative power generator is fixedly installed at the other end, a resin mixed adsorption chamber is provided at the middle position inside the dialysis chamber, an anion exchange membrane assembly is inserted and installed on the side of the resin mixed adsorption chamber facing the positive power generator, and a cation exchange membrane assembly is inserted and installed on the side of the resin mixed adsorption chamber facing the negative power generator, and two groups of cleaning reagent storage modules are arranged at the intersection of the anion and cation exchange resin chambers to store chemical cleaning reagents of different properties respectively, so that corresponding chelating agents can be configured for organic pollutants adsorbed on the anion resin.

The differential mechanism with the anti-rotation gaskets comprises a differential mechanism shell, a planetary gear and a half axle gear, a planetary gear gasket is arranged between the differential mechanism shell and the planetary gear, and a half axle gear gasket is arranged between the differential mechanism shell and the half axle gear; a first locking part is outwards arranged on the circumferential edge of the planetary gear gasket in the radial direction, a second locking part is outwards arranged on the circumferential edge of the half axle gear gasket in the radial direction, and a first clamping groove and a second clamping groove matched with the first locking part and the second locking part are formed in the differential mechanism shell; the face, making contact with a planetary gear, of the planetary gear gasket is a concave arc face, and first surface textures are arranged on the arc face and evenly distributed in the circumferential direction of the planetary gear gasket. Second surface textures are arranged on the face, making contact with the half axle gear, of the half axle gear gasket and are evenly distributed in the circumferential direction of the half axle gear gasket. Through the gear gasket of the structure, abrasion of a differential mechanism is reduced, and the operation reliability of the differential mechanism is improved.

The utility model discloses a high efficiency's fierce fire staggered floor combustion system of upper air inlet, include: furnace head subassembly, furnace base, blast box, air blower and fierce fire air outlet structure, blast box and air blower set up in the below of range panel, the blast outlet of fierce fire air outlet structure is located the above of range panel, towards the injection port of injection channel, blast box is equipped with the blast connecting port of connecting fierce fire air outlet structure, and air blower can send air through blast box to the blast outlet of fierce fire air outlet structure, the utility model discloses, break through upper air inlet space limit, realize efficient blast, the core innovation is in the ingenious adoption " blast source lower -positioned, air -supply path up -going, air -out point upper -positioned " split type design. Through special fierce fire air outlet structure, air is accurately delivered to the injection channel injection port near the above of range panel, realizes the core function of forced air supply. This design perfectly adapts the structural characteristics of all upper -positioned of upper air inlet burner injection system.

The present invention provides a three-dimensional variable space condensing gas water heater whose heat exchange core is shaped like a woven daily necessity "bamboo basket". The heat exchange core is mainly composed of a water heater shell, a "basket"-shaped three-dimensional variable space heat exchange core, a guide tube, a partition layer and a burner, wherein the heat exchange core is composed of a single-layer or multi-layer "basket"-shaped coil, and is connected by a water inlet header and a water outlet header. The "basket"-shaped coil is made of a three-dimensional variable space tube, and the high-temperature flue gas generated by the burner enters the "basket"-shaped three-dimensional variable space heat exchange core and performs efficient heat exchange with the medium in the tube. The use of this three-dimensional variable space variable cross-section "basket"-shaped heat exchange core can effectively improve the heat exchange coefficient of the gas water heater heat exchanger, thereby improving the heat exchange efficiency of the water heater, which is beneficial to reducing the total volume of the water heater, reducing weight, saving materials, and reducing costs. In addition, it is easy to clean dust and scale, and extend the maintenance cycle.

The utility model discloses a double-layer combined flue gas distribution volute core, which belongs to the technical field of flue gas distributors and comprises a gas inlet pipe and a double-layer flue gas treatment component mounted in the gas inlet pipe. When the device is used, the replacement assembly arranged on the flow guide plate can drive a first bevel gear and a second bevel gear to be in meshing transmission by rotating a grip in an equipment running state by utilizing a mounting disc, a fixed frame and a magnetic attraction structure, so that quick replacement of a medium block is realized, the tedious operation of stopping, reducing pressure and supplementing a medium is avoided, and the working efficiency is improved. Meanwhile, the fan blades on the inner wall of the mounting frame and the conical mixing cover act synergistically, so that a flue gas flow field is optimized, direct scouring of high-speed airflow to a medium block is reduced, the service life of a medium is prolonged, and the consumption speed is reduced; the equipment does not need to be frequently started and stopped, the mechanical wear of the pipeline and the volute core part is greatly reduced, the maintenance cost of the equipment is effectively reduced, and the efficient, stable and economical operation of the flue gas pretreatment process is realized.

The invention provides a leachate lift pump system with a multi-stage dynamic filtration and anti-blocking structure and a control method, and the leachate lift pump system comprises a reverse rotation cutting mechanism, a first-stage coarse filtration device, a forward crushing mechanism, a second-stage precise filtration device, a vortex centrifugal separation device and a main driving unit which are sequentially arranged in the leachate lifting direction, the main driving unit drives a main pump impeller of the leachate lifting pump system and a forward crushing mechanism coaxially connected with the pump impeller to rotate through a main pump motor; the percolate lift pump system further comprises a vibration monitoring module, viscosity monitoring modules arranged at the pump inlet of the main pump and the percolate flow channel, pressure difference monitoring modules arranged at the filtering devices, a flow monitoring module arranged at the pump outlet of the main pump and a liquid level monitoring module arranged at the percolate collecting pool. The vortex centrifugal separation device is used for separating solid substances and liquid substances of the percolate through centrifugal force of flowing of the percolate; the device is provided with a bionic anti-blocking conveying structure, has a screening and separating function, and can realize efficient multi-stage dynamic filtering and crushing.

The invention relates to a centrifugal fan component, in particular to a fan impeller structure which comprises an impeller disc, a cover plate and a plurality of blades arranged between the impeller disc and the cover plate. The cover plate covers the upper end of the blade, and the blade is provided with a radial inner part exposed from the inner edge of the cover plate; notches for increasing flow are concavely formed in the upper edges of the radial inner parts of at least part of the blades, so that the blades and the other blades are arranged in a high-low manner. The impeller is simple in structure, low in cost and easy to implement, the notches are formed in the upper edges of part of the arc-shaped blades to form a blade combination structure which is alternately arranged in a high-low mode, an air channel is optimized, a good flow guiding effect is provided, the impeller gas flow field is effectively improved on the premise that the diameter size of the impeller is kept unchanged, and the impeller efficiency is improved. The purposes of improving the air volume and efficiency of the centrifugal fan are achieved.