56results about How to "Stable air intake" patented technology

The invention relates to the technical field of tail gas emission control of vehicles, and discloses a particulate matter sensor. The particulate matter sensor is provided with a conductive shell, a cylindrical protective piece and a high-voltage electrode which is arranged in the conductive shell and is insulated from the conductive shell, wherein the conductive shell is grounded; the high-voltage electrode is connected with a high-voltage power supply; one end of the conductive shell is connected with one end of the protective piece in a sealed mode; and a tail gas inlet and a tail gas outlet are formed in the protective piece. A measurement method for the particulate matter sensor comprises the following steps of: grounding the conductive shell; applying high voltage onto the high-voltage electrode; allowing gas to be detected to flow through the clearance between the high-voltage electrode and the conductive shell, wherein particulate matters in the gas to be detected are ionized or polarized into conductors through the high-voltage electrode, and other matters in the gas to be detected are not ionized or polarized into the conductors; measuring leakage current, capacitance or resistance values between the high-voltage electrode and the conductive shell; and acquiring the concentration of the particulate matters in the gas to be detected according to a functional relation. The particulate matter sensor and the measurement method thereof are high in measurement accuracy; and the particulate matter sensor has long service life.

The invention discloses a puffing combination pump apparatus used for ice cream makers. The apparatus comprises fixed boxes, combination pumps arranged in the fixed boxes, tee pipe joints, and feeding assemblies and discharging assemblies which are respectively connected with the combination pump; and every combination pump comprises a liquid pump and an air pump which are integrated into one, the feeding openings of liquid pumps are connected with the feeding assemblies, the discharging openings of liquid pumps are in threaded connection with the tee pipe joints, and the air outlets of the air pumps are connected with the discharging assemblies through the tee pipe joints. The puffing combination pump apparatus can effectively improves the puffed rate of ice cream to 55-65%, has a very substantial and stable puffing effect, makes ice cream made by using the apparatus have fine, soft and smooth mouthfeel, and has the characteristics of simple structure, low cost, convenient cleaning and detaching, good reliability, greenness and environmental protection. The invention also discloses an ice cream maker.

The invention discloses a vacuum pressure continuous control method used for a polysilicon ingot casting process. A vacuum mode is adopted in furnace heating step; then the melting, growing, annealing and cooling steps are carried out; the gas voltage regulation mode is adopted; under the voltage regulation mode, two modes of gas inlet regulation and gas outlet regulation are adopted to regulate the furnace pressure. At the same time, the invention also discloses a control system for realizing the control method. The method can be used for the polysilicon ingot casting production, can steadily control the vacuum furnace pressure, can guarantee stable gas inlet and gas outlet at the same time, can save the input gas consumption, and is simple and practical and has ideal control effect.

The invention discloses an electrochemical synchronous nitrogen and phosphorus removal apparatus and a municipal sewage treatment method, and belongs to the technical field of sewage treatment. A dimensionally stable electrode, an iron electrode, an aluminum electrode, a magnesium electrode and a copper modified stainless steel electrode which are commonly used in an electrochemical water treatment technology are combined to realize the nitrogen and phosphorus removal treatment of the municipal sewage in a same electrolytic cell. The apparatus has the advantages of simple structure, operation convenience, high efficiency, stable indexes of discharged water, and realization of the large-scale automatic sewage treatment. The municipal sewage method has the advantages of simple technology, operation convenience, manpower and material resource saving, low energy consumption, high removal rate of sewage pollution indexes, and realization of the removal rate of each of the municipal sewage indexes comprising the chemical oxygen demand, nitrate nitrogen, ammonia nitrogen and total phosphorus to reach above 92%.

The invention relates to the technical field of tail gas emission control of vehicles, and discloses a particulate matter sensor with improved measurement accuracy. The particulate matter sensor is provided with a conductive shell, a cylindrical protective piece and a high-voltage electrode which is arranged in the conductive shell and is insulated from the conductive shell, wherein the conductive shell is grounded; high voltage is applied onto the high-voltage electrode; and a metal shielding layer is arranged in a sealed space and at the periphery of the high-voltage electrode, is grounded and is insulated from the high-voltage electrode. A measurement method for the particulate matter sensor comprises the following steps of: measuring leakage current, capacitance or resistance values between the high-voltage electrode and the conductive shell; and acquiring the concentration of particulate matters in gas to be detected according to a functional relation. The particulate matter sensor with the improved measurement accuracy has high measurement accuracy and long service life; and by the metal shielding layer, interference leakage current is eliminated, and pollutants of which the outside is oxidized and corroded can be prevented from entering an internal space so as not to influence the measurement accuracy and the service life.

The invention discloses a multifunctional computer case with a cooling function. The multifunctional computer case comprises a bottom plate, wherein the bottom plate is fixedly connected with the case through a damping device; the top of the inner cavity of the case is fixedly connected with a cooling fixing plate; the top of the cooling fixing plate is fixedly connected with a fixed station; the inner wall of the fixed station is provided with cooling fins; the bottom of the cooling fins is fixedly connected with heat conduction pipes; the heat conduction pipes penetrate through the cooling fixing plate and extend into the case; two sides, which are positioned on the fixed station, of the top of the cooling fixing plate are fixedly connected with supporting rods; and the top of each supporting rod is fixedly connected with a cooling fan. The invention relates to the technical field of computer hardware. By use of the multifunctional computer case with the cooling function, the problem that an existing case is only a case, does not have other functions and is monotonous in design is solve, the damping device is used for reducing a gap generated between the case and the bottom plate, a bottom air inlet designed on the bottom of the case can more stably feed air, and the effect of dust prevention can be performed through a dust-proof filter net and a dust-proof net.

The invention provides a preparation method and a preparation device for a synthesis ammonia prereduction catalyst. The preparation method comprises the following steps: feeding a synthesis ammonia Fe catalyst into a reduction tower, and introducing mixed hydrogen and nitrogen; then heating at a heating rate of 30-40 DEG C / h, and performing reduction reaction when the temperature raises to 365-380 DEG C; after the reduction reaction is over, discharging the mixed hydrogen and nitrogen out of the reduction tower; when the temperature is reduced to be not higher than 50 DEG C and normal pressure is achieved, introducing oxygen for passivating, wherein the pressure during the passivation process is kept between 0.018MPa and 0.02MPa; and after the temperature is reduced to be not higher than 46 DEG C, finishing passivation, thereby obtaining the synthesis ammonia prereduction catalyst. In the preparation device, in-parallel double towers are adopted for the reduction tower, a passivation groove is omitted, heating reduction and passivation are performed in the reduction tower, and a method of negative pressure extraction by use of a circulating fan is adopted during the passivation process, so that the effective production time is obviously increased, the reducing capacity is greatly improved, the operation difficulty is simplified, power consumption is reduced, and the air inflow stability of a system is ensured.

The invention relates to a four-stroke layered double-swirling combustion energy-saving internal-combustion engine with a new air distribution mechanism, and is particularly suitable for various internal-combustion engines for seas, land and space. A cylinder (28) and a cylinder oil nozzle gasket (32) are arranged on a crankcase (85) of a conventional four-stroke single-cylinder gasoline rod ejector, the new air distribution mechanism is arranged in a small cylinder head (12), and a small cylinder (40) is arranged inversely. The front of the wall of the small cylinder (40) is provided with two ports (34), and a small piston (38) slides up and down to suck air and exhaust air. The sucked air rotationally enters along the walls of the big cylinder (28) and the small cylinder (40), the inlet fuel oil rotationally enters, the big and the small pistons apply work at the same time, and the exhausted air pushes a suction-exhaust turbine (51) to apply first work. The internal-combustion engine has the advantages of simple structure, good lubricating condition, long service life, stable work, high revolution rate and no noise; and the engine realizes layered double-swirling combustion of the fuel oil swirled in the middle of an hot air interlayer, and realizes three-time work application in one-time combustion, so that the engine has higher high-power output, saves the fuel oil by about 50 percent and reduces the emission by 85 percent.

The invention is suitable for the technical field of wind tunnel tests, and provides an air inlet simulation system, an air inlet simulation method and an empty model pressure loss simulation method, and the system comprises a test model, a large-flow air exhaust mechanism, a small-flow air exhaust mechanism and an air outlet mechanism. The system is characterized in that the air inlet end of the small-flow air exhaust mechanism, the air inlet end of the large-flow air exhaust mechanism and the air outlet end of the test model are communicated with one another; the large-flow air exhaust mechanism comprises a large centrifugal fan, the large centrifugal fan is located on the side, close to the air outlet end, of the large-flow air exhaust mechanism, and the small centrifugal fan is located on the side, close to the air outlet end, of the small-flow air exhaust mechanism; and the air inlet end of the air outlet mechanism is communicated with the air outlet ends of the large-flow air exhaust mechanism and the small-flow air exhaust mechanism. The invention aims to provide an air inlet simulation system suitable for different types of engine models, can meet various air inlet simulation requirements, and has the characteristics of wide flow range, stable flow and the like.

The invention discloses an anti-stabbing circulating smoke exhaust device for single-port laparoscopic surgery, and belongs to the field of medical instruments. The anti-stabbing circulating smoke exhaust device comprises an operating mechanism and a filtering mechanism; the operating mechanism comprises an operating platform and a smoke exhaust needle, the operating platform is provided with an operating channel, a sight glass channel and an air inlet channel, and a positioning rope is detachably connected between the smoke exhaust needle and the operating platform; and the filtering mechanism comprises a filtering box, and a smoke exhaust pipe is detachably connected between the smoke exhaust needle and the filtering box. The invention further provides a corresponding smoke exhaust method. The anti-stabbing circulating smoke exhaust device for single-port laparoscopic surgery can solve the problem that in an existing single-port laparoscope technology, smoke and water vapor are gathered near the operating platform to affect the operation view, the smoke and the water vapor in the pneumoperitoneum can be effectively exhausted, and it is guaranteed that the smoke and the water vapor cannot interfere with the operation view.

The invention relates to the technical field of chemical equipment and discloses a pyromellitic dianhydride reactor. The pyromellitic dianhydride reactor comprises a tank body, wherein a reaction gasoutlet is formed in one side of the bottom of the tank body; a reaction gas inlet is formed in the top of the tank body; a molten salt inlet is formed in one side of the upper end of the tank body; amolten salt outlet is formed in one side of the lower end of the tank; supporting legs are fixedly mounted at the bottom of the tank body; an air inlet is formed in one side of the top of the tank body; an air inlet pipe is fixedly mounted at the lower end in the tank body; and one end of the air inlet pipe penetrates through the air inlet, extends out of the tank body and is fixedly mounted withan air blower. According to the pyromellitic dianhydride reactor, a reaction gas inlet pipe is horizontally arranged above row tubes, so reaction gas feed of each row tube is uniform, and the situation of over-high temperature is avoided,; and the air inlet pipe is horizontally arranged above the row tubes, so an air quantity is sufficient, an air speed can be controlled, and reaction efficiency is improved.

The invention belongs to the technical field of turbomachines, and particularly relates to a one-dimensional linear hollow guide vane applied to compressors. In order to solve the problem that the damage rate of compressor impellers with guide vanes is high at present, the invention provides the one-dimensional linear hollow guide vane which can reduce the wake vortex, a guide vane body is provided with a groove from a vane root to a vane tip, and the groove is provided with two slots which lead to the trailing edge of the guide vane body. The structure of the one-dimensional linear hollow guide vane is simple, and compared with like products, the one-dimensional linear hollow guide vane has the remarkable beneficial effects that because the section of the groove in the guide vane is round or elliptic, intake is more smooth; the fluidity effect of the two slots of the groove of the guide vane leading to the tailing edge of the guide vane is far better than the fluidity effect of a single slot, the attenuation of the wake vortex generated by fluid passing through the two slots is the fastest, and therefore the effect of reducing the wake vortex is achieved; the original design of the vane is kept from the leading edge to the middle part, flow control needed by the guide vane and a pre-whirl function can also be provided, and therefore the original function of the guide vane cannot be affected by the novel structure.

The invention discloses a pure-magnetic-drive gas booster which comprises a cylinder body and a piston in the cylinder body. The pure-magnetic-drive gas booster is characterized in that the two ends of the cylinder body are equipped with plugging heads, wherein a piston is arranged in the cylinder body, the piston is a permanent magnet piston, at least one of the two plugging heads is an electromagnetic driver, the two end parts of the cylinder body are each equipped with a one-way gas inlet and a one-way gas outlet, which define a group; after the electromagnetic driver on the end part of thecylinder body is energized, a corresponding magnetic pole is formed to axially apply force, and the magnetic pole is matched with a magnetic pole of the permanent magnet piston to drive the piston tomove, so that gas enters from the one-way gas inlet, and pressurized gas is output from the one-way gas outlet.

The invention specifically relates to an air path control system suitable for differential pressure casting, which includes an air compressor, a compressed air oil-water separator, a dryer, an air intake system, a differential pressure casting mold and an exhaust system connected in sequence; The air system includes a first intake passage and a second intake passage; the exhaust system includes a first exhaust passage and a second exhaust passage, and the first intake passage, the second intake passage, the first row Throttle valves are respectively arranged on the air passage and the second exhaust passage. The system controls the air intake and exhaust of the differential pressure casting mold, so that the air intake during the differential pressure casting process is stable, and the gas pressure fluctuations during the pressure holding process are small, thereby ensuring the molding quality of the casting. The system is simple in structure, reasonable in design, and has good practicability and popularization.

The invention discloses a novel air-breathing pulse detonation engine which comprises air supply systems, detonation chamber systems, initiation systems, fuel oil supply systems and corresponding control systems. The novel air-breathing pulse detonation engine is mainly characterized in that main detonation chambers are unique high-speed rotary components and can rotate, accordingly, air intermittent filling can be controlled, and internal intermittent detonation combustion can be carried out on the main detonation chambers. The novel air-breathing pulse detonation engine has the advantages that a method for effectively increasing the operating frequencies of the novel air-breathing pulse detonation engine on the premise that the filling volumes of detonable mixtures are not decreased is provided, accordingly, the problem of fuel gas reverse transmission of existing air-breathing pulse detonation engines can be solved to a certain extent, and a novel way can be provided to developing practical high-power detonation engines.

A gas stove head device comprises a base, a cover body with a through hole in the center and a sealing plug arranged in the through hole. The base is matched with the cover body, the cover body is of an annular structure with a conical inward-concave face, and blind holes are circumferentially distributed in the wall of the through hole in the center of the cover body. The upper surface of the cover body is provided with V-shaped grooves which are arranged at intervals, and inclined faces on the two sides of each V-shaped groove are provided with a gas groove and an air groove respectively. The air grooves are communicated with the insides of the blind holes, and the gas grooves penetrate through the upper surface and the lower surface of the cover body. The lower bottom face of the base is provided with a side leading-in pipe and a ventilation opening for installing a supercharge turbo-blower. The ventilation opening is arranged corresponding to the through hole in the cover body. The gas stove head device can achieve convection of gas and air, air is added through the air grooves, so that gas gathers together upwards, heat loss is reduced, combustion is more sufficient, and the effect of energy conservation and environment protection is achieved. After the gas stove head device is used for a long time, the gas stove head device can not expand and deform easily, and service life is prolonged.

The invention discloses an array type jet flow water purifier. A purifier frame body is arranged on a purification water tank, a first baffle plate and a second baffle plate are arranged in the purifier frame body, multiple layers of non-equilibrium plasma jet flow exciters are arranged between the first baffle plate and the second baffle plate, and the multiple non-equilibrium plasma jet flow exciters of each layer are distributed circumferentially; the area between the first baffle plate and the inner wall of the purifier frame body is an air inflow pressure stabilizing cavity, air inlets are formed in the purifier frame body, jet orifices are formed in the second baffle plate, one end of each non-equilibrium plasma jet flow exciter is fixed on the first baffle plate, and spray nozzles are arranged the other ends of the non-equilibrium plasma jet flow exciters and aligned to the corresponding jet orifices; and an internal area defined by the second baffle plate is a purification area. With the adoption of the technical scheme of the liquid atomization technology and the non-equilibrium plasma jet flow technology, the purification efficiency can be substantially increased, and thepurification flow rate can also be greatly increased.

The invention discloses a multi-area atmosphere control metal injection molding vacuum sintering furnace which comprises a material box, at least two layers of material plates, air inlet valves, at least two division holes, a convergence groove and an air outlet pipe. The material box is provided with air inlets which communicate with the air inlet valves. The material box is internally provided the material plates. To-be-machined products are stored on the material plates. Each side plate of the material box is provided with at least two sets of division grooves which divide the material box into a plurality of areas. Each set of division grooves corresponds to one air inlet. The bottom of the material box communicates with the convergence groove through the division holes. The convergence groove communicates with the air outlet pipe. According to the multi-area atmosphere control metal injection molding vacuum sintering furnace, through multi-area division and width direction air inflow, the atmosphere uniformity in the material box is ensured, and the size deviation of the products in the areas is adjusted and controlled by adjusting the airflow in all the areas.

The invention discloses an air inlet device of a rail vehicle. The air inlet device comprises an air inlet duct main body. End part air inlets are formed in the two ends of the air inlet duct main body, guide plates are arranged in the air inlet duct main body, locking mechanisms are arranged on the side edges of the guide plates, limiting steps and unlocking air ducts are arranged on the lateralsides of the air inlet duct main body, the end part air inlet in the front end communicates to the air inlet of an air conditioner when a vehicle moves forward, the locking mechanisms lean against thelimiting steps to fix the positions of the guide plates when the vehicle moves forward normally, and an air flow enters from the unlocking air ducts to push the locking mechanisms to be separated from the limiting steps when the heading direction of the vehicle is turned. A phenomenon that air cannot enter or the air inlet quantity of the air inlet device is small as a result of a negative pressure formed near the surface when the vehicle travels is overcome effectively, and the air inlet quantity is guaranteed, so that the ventilating and cooling effect of a ventilating system of the air conditioner is guaranteed. Meanwhile, the positions of the guide plates are locked by means of the locking mechanisms and the guide plates are unlocked through the unlocking air ducts by means of the airflow. The invention also discloses the rail vehicle comprising the air inlet device.

The invention discloses a thermal treatment furnace for steel wires, and relates to the technical field of thermal treatment of the steel wires. The front of a heating section is arranged to be of a hot air type structure, a front nozzle is a hot air nozzle, and the input end of the nozzle is connected to air pipes and gas pipes; the rear of the heating section is arranged to be of a premixing type structure, a rear nozzle is a premixing nozzle, and the air pipes and the gas pipes are connected to a pre-mixer and then are connected to a premixing nozzle through mixed gas pipes; a furnace body is provided with a discharge flue, and the discharge flue is provided with an induced draft fan. When the external atmospheric pressure changes, the induced draft fan still can maintain certain gas displacement, and therefore smoke inside the furnace can become stable, the atmospheric pressure can keep stable, and the thermal treatment effect of the steel wires can be guaranteed. In addition, the hot air type structure and the premixing type structure are matched, the furnace atmosphere can be accurately controlled, the oxidation degree of the steel wires can be lower, the waste heat of the smoke can be fully utilized, and the energy utilization rate can be increased.

The invention relates to a safe and efficient boiler blower device. The safe and efficient boiler blower device comprises a combustion chamber. A partition is arranged on the lower portion in the combustion chamber. Multiple air outlet pipes are arranged on the upper surface of the partition. The interiors of the air outlet pipes communicate with a space defined by the partition and the bottom face of the combustion chamber, and a first one-way air inlet valve is arranged on each communicating position. An air inlet is formed in one side of the combustion chamber. A second one-way air inlet valve is arranged at the air inlet. An opening symmetrical with the air inlet is formed in the other side of the combustion chamber. An elastic film is arranged on the opening. The safe and efficient boiler blower device further comprises an eccentric wheel for pressing the elastic film and a drive motor for driving the eccentric wheel. The eccentric wheel is driven by the drive motor to rotate. The elastic film is pressed through the eccentric wheel and vibration is generated so that the interior of the space between the combustion chamber and the partition generates air pressure changes, and when the air pressure becomes small, the second one-way air inlet valve sucks air from the outside; when the air pressure becomes big, the air is exhausted into the combustion chamber through the air outlet pipes by means of the first one-way air inlet valves, effective air inlet is achieved at the bottom of a combustible, air inlet is quite stable, and the safety is high; and the whole structure is simple, and the cost is low.

The invention relates to a device and a method for testing the gas permeability of concrete. The device comprises test boxes, elastic sealing rings, a pressure pump and a pressure tank. The elastic sealing rings are used for fixing concrete test pieces and are arranged on the inner walls of the test boxes in a surrounding manner, and annular cavities which are coaxial with the elastic sealing rings are arranged in the elastic sealing rings; the concrete test pieces are fittingly mounted in the elastic sealing rings, inner cavities of the test boxes are divided into first cavities and second cavities by the concrete test pieces, the first cavities are independent from the second cavities, the pressure pump is connected with the elastic sealing rings by a first pipeline and is communicated with the annular cavities, the pressure tank is connected and communicated with the first cavities by a second pipeline, and the second cavities are communicated with the atmosphere. The device and themethod have the advantages that gaps between the concrete test pieces and the elastic sealing rings can be prevented, inert gas in the first cavities only can be unidirectionally permeated into the external atmosphere via the concrete test pieces when the first cavities under the concrete test pieces are filled with the inert gas via the pressure tank, measurement procedures are simple, and results are high in accuracy.

The round hole polishing and deburring mechanism comprises a box body and a mechanical arm located on one side of the box body, a plurality of rotating shafts are arranged in the box body in a linear array mode, and a transmission part is arranged between every two adjacent rotating shafts; a self-adaptive polishing device is arranged at the top end of the rotating shaft and comprises a shaft pipe, an air bag component arranged on the outer wall of the shaft pipe in a sleeving mode and communicating with the air inlet cavity and the air outlet cavity, an elastic polishing sleeve arranged outside the air bag component in a sleeving mode and an airflow sweeping component arranged at the bottom of the side wall of the shaft pipe, and the interior of the shaft pipe is divided into an air inlet cavity and an air outlet cavity through a partition plate. The air inlet component is arranged on the upper surface of the box body, and the temperature control air supply component is arranged on the side wall of the box body; a clamping jaw is arranged at the executing end of the mechanical arm, a part containing frame is arranged at the bottom of the clamping jaw, and a plurality of part hole positioning components are arranged on the part containing frame. According to the round hole polishing mechanism, a plurality of part holes can be conveniently positioned and polished at the same time, and the part holes of different sizes can be conveniently and stably polished.

The invention discloses a hot air heat utilization system for an indirect cooling tower. The hot air heat utilization system comprises the indirect cooling tower and an air inlet header; a plurality of air outlets are symmetrically formed in the part above a heat exchange area of the indirect cooling tower, and an annular air extracting box is arranged outside the air outlets and is connected to the outer side of the indirect cooling tower in a sealed mode; an outlet of the annular air extracting box is connected to the air inlet header, and hot air of the indirect cooling tower is conveyed into an air heater by a fan for being heated again after flowing through the air inlet header. According to the hot air heat utilization system, during the low-temperature operation period of a unit, the hot air of the indirect cooling tower is utilized as the air source entering the air heater, and therefore the steam extraction amount of the air heater can be lowered, the operation efficiency of a steam turbine can be improved, the exhaust gas temperature of a boiler can be increased, and blockage and corrosion of an air pre-heater can be reduced; the air extracting box is arranged in an annular mode, and therefore air inletting is stable; during the low-temperature operation period, the coal consumption of power generation can be lowered by 0.5 g / (Kw.h).

The invention discloses an electrochemical synchronous nitrogen and phosphorus removal apparatus and a municipal sewage treatment method, and belongs to the technical field of sewage treatment. A dimensionally stable electrode, an iron electrode, an aluminum electrode, a magnesium electrode and a copper modified stainless steel electrode which are commonly used in an electrochemical water treatment technology are combined to realize the nitrogen and phosphorus removal treatment of the municipal sewage in a same electrolytic cell. The apparatus has the advantages of simple structure, operation convenience, high efficiency, stable indexes of discharged water, and realization of the large-scale automatic sewage treatment. The municipal sewage method has the advantages of simple technology, operation convenience, manpower and material resource saving, low energy consumption, high removal rate of sewage pollution indexes, and realization of the removal rate of each of the municipal sewage indexes comprising the chemical oxygen demand, nitrate nitrogen, ammonia nitrogen and total phosphorus to reach above 92%.

The invention relates to a gas premixing device capable of fully mixing. The gas premixing device capable of fully mixing comprises a gas mixing pipe, an inner core and a regulation valve, wherein a first premixing device and a second premixing device are respectively arranged at two ends of the gas mixing pipe, the inner core is arranged in the gas mixing pipe, a first air inlet is formed in thepipe wall of the gas mixing pipe, the first water inlet is provided with an air inlet pipe communicating with the first water inlet, and a regulating valve is arranged on the air inlet pipe. The gas premixing device capable of fully mixing is composed of the gas mixing pipe, the inner core and the regulation valve, and the premixing devices are respectively arranged the two ends of the gas mixingpipe, and therefore the gas premixing device capable of fully mixing is stable in air inflow amount and efficient in air inflow, can fully mix two types of gas after three times of mixing, improves consumption efficiency of flue gas, and saves resource.

The invention provides an upward-drawing type dense-lean burner. A burning sheet fixing plate is provided with a burning sheet set; the burning sheet set is composed of a plurality of single-sheet fire holes; the side face of each single-sheet fire hole is provided with a lean air inlet and a dense air inlet; the lean air inlets are communicated with auxiliary flame holes in the tops of the single-sheet fire holes; the dense gas inlets are communicated with main flame holes in the tops of the single-piece fire holes; the auxiliary flame holes are symmetrically formed in the two sides of the main flame holes; and a fan is arranged above a heat exchanger and used for discharging nitrogen oxides generated by a burner assembly and increasing oxygen for flames of the single-piece fire holes so as to promote combustion. According to the upward-drawing type dense-lean burner in the invention, the air inflow proportion of the lean air inlets and the dense air inlets can be flexibly adjusted according to needs, a filter screen is cleaned, the adjusted air inlet amount is kept stable, the problem that the difference between the adjusted amount and the actual amount is too large due to the fact that the filter screen is blocked by dust is solved, the adjusted amount and the actual amount promote each other, and the using effect is good. The upward-drawing type dense-lean burner is worthy of popularization.