A graded air distribution device

Abstract

The present invention discloses a graded air distribution device, comprising: an air inlet housing, an air regulating device, a nozzle, a primary airflow channel, a secondary airflow channel and a rotating airflow regulating structure; the air inlet housing comprises an internal cavity, an air inlet and an air outlet; the nozzle is connected to the air outlet of the air inlet housing; the air regulating device is installed at the air inlet of the air inlet housing; the primary airflow channel and the secondary airflow channel are located in the internal cavity of the air inlet housing, and the primary airflow channel and the secondary airflow channel are relatively independent. The graded air distribution device of the present invention is jointly regulated by the rotating airflow regulating structure and the position of the air regulating plate, and the ratio and rotation intensity of the primary and secondary air ejected at the nozzle can be changed. When used on a burner, flames of different shapes can be obtained, and it can be suitable for different furnace body shapes, improve the fuel mixing effect, and control the combustion speed of the fuel through graded air distribution, thereby effectively reducing the emission of NOx in the flue gas.

Description

Technical Field

[0001] The invention relates to the field of industrial heating burners, and in particular to a graded air distribution device. Background Art

[0002] Reducing the emission of nitrogen oxides (NOx) during fuel combustion is an environmental issue that needs to be solved urgently. At present, the combustion technology for reducing NOx emissions can be divided into three major technologies: pre-combustion, combustion and post-combustion treatment. Pre-combustion denitrification mainly adopts fuel purification treatment, that is, converting the fuel into low-nitrogen fuel; during combustion, denitrification mainly adopts staged combustion to change the combustion conditions in the furnace to reduce the generation of NOx: such as air staging, fuel staging and flue gas circulation combustion; post-combustion treatment methods include selective catalytic reduction, non-catalytic selective reduction, flue gas denitrification, etc.

[0003] At present, the method of graded air distribution is a relatively effective method to reduce the NOx emission concentration. However, the existing graded air distribution device has a relatively simple structure and cannot be adjusted, and it is very difficult to reduce the NOx emission concentration to a lower concentration. Summary of the invention

[0004] The main technical problem solved by the present invention is to provide a graded air distribution device, which can be used on a burner to obtain flames of different shapes, can be suitable for different furnace body shapes, improve the fuel mixing effect, and control the combustion speed of the fuel through graded air distribution, thereby effectively reducing the emission of NOx in the flue gas.

[0005] In order to solve the above technical problems, a technical solution adopted by the present invention is: to provide a graded air distribution device, including: an air inlet housing, an air regulating device, a nozzle, a primary air flow channel, a secondary air flow channel and a rotating air flow regulating structure;

[0006] The air inlet housing comprises an internal cavity, an air inlet and an air outlet;

[0007] The nozzle is connected to the air outlet of the air inlet housing; the air regulating device is installed at the air inlet of the air inlet housing; the primary air flow channel and the secondary air flow channel are installed in the internal cavity of the air inlet housing, and the primary air flow channel and the secondary air flow channel are relatively independent;

[0008] The air regulating device comprises an air regulating plate, which can rotate and stay in at least two extreme positions. When the air regulating plate is in the middle position, the inlet of the primary air flow channel and the inlet of the secondary air flow channel are opened at the same time; when the air regulating plate is in the first extreme position, the inlet of the secondary air flow channel is closed, and the inlet of the primary air flow channel is opened; when the air regulating plate is in the second extreme position, the inlet of the primary air flow channel is closed, and the inlet of the secondary air flow channel is opened;

[0009] The rotating airflow regulating structure includes an air inlet channel, which is connected to the first airflow channel. The rotating airflow regulating structure is provided with a first state and a second state. When the rotating airflow regulating structure is in the first state, the air inlet channel forms a cyclone channel; when the rotating airflow regulating structure is in the second state, the air inlet channel forms a straight air channel.

[0010] In a preferred embodiment of the present invention, a front partition and a rear partition are provided in the internal cavity of the air inlet shell, the front partition is located at the air outlet of the air inlet shell, and the rear partition is located at the air inlet of the air inlet shell, and the rear partition divides the internal cavity into a first cavity through which the primary airflow passes and a second cavity through which the secondary airflow passes.

[0011] In a preferred embodiment of the present invention, the secondary air flow channel includes a plurality of secondary air flow ducts, the front end of the secondary air flow duct is installed on the front baffle and connected to the nozzle; the rear end of the secondary air flow duct is installed on the rear baffle and connected to the second cavity through which the secondary air flow passes, and the second cavity, the secondary air flow duct and the nozzle form the secondary air flow channel.

[0012] In a preferred embodiment of the present invention, a secondary airflow nozzle is provided at the air outlet of the nozzle pipe, and the secondary airflow nozzle is a nozzle with different angles or a nozzle composed of blades with a certain angle.

[0013] In a preferred embodiment of the present invention, the rotating airflow regulating structure includes an air guide pipe, a cyclone, a vortex regulator and a regulator;

[0014] The air guide pipe is located at the outlet of the nozzle;

[0015] The vortex adjuster and the cyclone are located in the internal cavity. The vortex adjuster includes a rear sleeve and a vortex adjusting tube. The rear sleeve is installed at the tail end of the internal cavity. The vortex adjusting tube includes a slotted section and a sealing section. The slotted section of the vortex adjusting tube is sleeve-connected with the rear sleeve.

[0016] One end of the cyclone is connected to the sealing section of the swirl regulating tube, and the other end of the cyclone is connected to the air guide tube;

[0017] The regulator is connected to the rotatable tube, and the regulator regulates the forward and backward movement of the rotatable tube between the rear sleeve and the air guide tube;

[0018] When the cyclone regulating tube is located at the rear end, the cyclone device is connected with the air guide tube to form a cyclone channel;

[0019] When the swirl regulating tube is located at the front end, the swirl regulating tube is connected with the air guide tube to form a straight air channel.

[0020] In a preferred embodiment of the present invention, the cyclone includes a cyclone front cover, a cyclone rear cover and blades, the blades are installed between the cyclone front cover and the cyclone rear cover, the sealing section of the cyclone regulating tube is connected to the cyclone rear cover, and the air guide tube is connected to the cyclone front cover.

[0021] In a preferred embodiment of the present invention, the regulator includes an adjusting structure and a connecting rod, wherein the adjusting structure is installed on the outside of the air inlet housing, one end of the connecting rod is connected to the adjusting structure, and the other end is connected to the regulating tube.

[0022] In a preferred embodiment of the present invention, the rear end of the air guide duct is installed on the front baffle, and the front end of the air guide duct is installed at the air outlet of the nozzle and extends outside the air outlet of the nozzle.

[0023] In a preferred embodiment of the present invention, the air guide pipe is located at a coaxial center position of the nozzle, and a plurality of the secondary air flow ducts are installed around the air guide pipe.

[0024] In a preferred embodiment of the present invention, the position adjustment range of the air regulating plate is between 0°-180°, the percentage of the primary airflow and the secondary airflow obtained is between 5%-95%, and by adjusting the state of the rotating airflow regulating structure, the primary airflow can be converted between direct current wind, swirl wind and direct current swirl mixed wind.

[0025] The beneficial effects of the present invention are as follows: the graded air distribution device of the present invention can change the ratio of primary and secondary air ejection and the rotation intensity at the nozzle through the above-mentioned rotating airflow adjustment structure and the position of the air regulating plate, and can obtain flames of different shapes when used on the burner, which can be suitable for different furnace forms and improve the fuel mixing effect. The combustion speed of the fuel can be controlled by graded air distribution, so that the emission of NOx in the flue gas can be effectively reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a three-dimensional structural schematic diagram of a preferred embodiment of the graded air distribution device of the present invention;

[0027] Figure 2 yes Figure 1 A rear structural schematic diagram of the graded air distribution device shown;

[0028] Figure 3 yes Figure 2 AA cross-sectional structural diagram;

[0029] Figure 4 yes Figure 3 EE cross-sectional structure diagram;

[0030] Figure 5 yes Figure 3 A schematic diagram of a local enlarged structure;

[0031] Figure 6 yes Figure 1 A schematic cross-sectional view of the structure of the graded air distribution device in a first working state;

[0032] Figure 7 yes Figure 1 A schematic cross-sectional view of the structure of the second working state of the graded air distribution device shown;

[0033] Figure 8 yes Figure 1 A cross-sectional structural schematic diagram of the third working state of the graded air distribution device shown;

[0034] Fig. 9 yes Figure 1 A schematic cross-sectional view of the structure of the graded air distribution device in a fourth working state;

[0035] Fig.10 yes Figure 1 A cross-sectional structural schematic diagram of the fifth working state of the graded air distribution device shown;

[0036] The components in the accompanying drawings are marked as follows: 100-air inlet housing, 210-air adjusting plate, 220-air adjusting indicating handle, 300-nozzle, 310-primary air flow nozzle, 320-secondary air flow nozzle, 510-secondary air flow duct, 600-rotating air flow adjusting structure, 610-air guide pipe, 630-blade, 640-cyclone rear cover, 650-rotating adjusting tube, 660-connecting rod, 680-rear sleeve, 690-adjusting structure, 691-outer spiral tube, 692-inner spiral tube, 693-handle, 710-front partition, 720-rear partition. DETAILED DESCRIPTION

[0037] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0038] See also Figure 1-Figure 10 It should be noted that the diagrams provided in this embodiment illustrate the basic concept of the present invention, and the components of the present invention in the diagrams are drawn according to the number, shape and size of components in actual implementation. The embodiments of the present invention include:

[0039] like Figures 1 to 5As shown, a graded air distribution device includes: an air inlet housing 100, an air regulating device, a nozzle 300, a primary air flow channel, a secondary air flow channel and a rotating air flow regulating structure 600.

[0040] The air inlet housing 100 includes an internal cavity, an air inlet and an air outlet. In this embodiment, the air inlet housing 100 is L-shaped, and the air inlet and the air outlet are located at two ends of the L-shape.

[0041] The nozzle 300 is installed at the air outlet of the air inlet housing 100, and the tail end of the nozzle 300 is connected to the air outlet of the air inlet housing 100. In this embodiment, the tail end of the nozzle 300 is detachably connected and fixed to the air outlet of the air inlet housing 100 by bolts or other connecting parts, and can also be fixed in other ways. A primary airflow nozzle 310 and a secondary airflow nozzle 320 are provided at the outlet of the nozzle 300. The secondary airflow nozzle 320 is a nozzle hole of different angles or a nozzle hole composed of blades at a certain angle, which can be replaced according to different combustion characteristics.

[0042] The air regulating device is installed at the air inlet of the air inlet housing 100. The air regulating device includes an air regulating plate 210 and an air regulating indicating handle 220 which are connected to each other. The air regulating plate 210 is installed in the air inlet housing 100, and the air regulating indicating handle 220 is installed outside the air inlet housing 100. The angle position of the air regulating plate 210 can be adjusted by twisting the air regulating indicating handle 220. The air regulating plate 210 can rotate and can stay in at least two extreme positions: a first extreme position and a second extreme position. When the air regulating plate 210 is in the middle position, the inlet of the primary air flow channel and the inlet of the secondary air flow channel are opened at the same time; when the air regulating plate 210 is in the first extreme position, the inlet of the secondary air flow channel is closed, and the inlet of the primary air flow channel is opened; when the air regulating plate 210 is in the second extreme position, the inlet of the primary air flow channel is closed, and the outlet of the secondary air flow channel is opened.

[0043] The primary airflow channel and the secondary airflow channel are located in the internal cavity of the air inlet housing 100, the primary airflow channel and the secondary airflow channel are relatively independent, the inlet of the primary airflow channel and the inlet of the secondary airflow channel are located at the air inlet of the air inlet housing 100, and the outlet of the primary airflow channel and the outlet of the secondary airflow channel are located at the air outlet of the air inlet housing 100. Specifically, a front baffle 710 and a rear baffle 720 are provided in the internal cavity of the air inlet housing 100, the front baffle 710 is located at the air outlet of the air inlet housing 100, the rear baffle 720 is located at the air inlet of the air inlet housing 100, and the rear baffle 720 divides the internal cavity into a first cavity through which the primary airflow passes and a second cavity through which the secondary airflow passes. The secondary airflow channel includes a plurality of secondary airflow ducts 510, the front end of which is mounted on the front baffle 710 and communicated with the nozzle 300; the rear end of which is mounted on the rear baffle 720 and communicated with the second cavity through which the secondary airflow passes, the second cavity, the secondary airflow duct 510 and the nozzle 300 forming the secondary airflow channel. The first cavity through which the primary airflow passes is the primary airflow channel.

[0044] The rotating airflow regulating structure 600 includes an air inlet channel, which is connected to the first airflow channel. The rotating airflow regulating structure 600 is provided with a first state and a second state. When the rotating airflow regulating structure 600 is in the first state, the air inlet channel forms a cyclone channel; when the rotating airflow regulating structure 600 is in the second state, the air inlet channel forms a straight air channel.

[0045] Specifically, the rotating airflow regulating structure 600 includes an air guide pipe 610, a cyclone, a swirl regulator and a regulator; the air guide pipe 610 is located at the outlet of the nozzle 300; the swirl regulator and the cyclone are located in the internal cavity, the swirl regulator includes a rear sleeve 680 and a swirl regulating pipe 650, the rear sleeve 680 is installed at the rear end of the internal cavity, the swirl regulating pipe 650 includes a slotted section and a sealing section, and the slotted section of the swirl regulating pipe 650 is sleeved and connected with the rear sleeve 680; One end of the cyclone is connected to the sealing section of the swirl regulating tube 650, and the other end of the cyclone is connected to the air guide tube 610; the regulator is connected to the swirl regulating tube 650, and the regulator regulates the forward and backward movement of the swirl regulating tube 650 between the rear sleeve 680 and the air guide tube 610; when the swirl regulating tube 650 is located at the rear end, the cyclone is connected to the air guide tube 610 to form a cyclone channel; when the swirl regulating tube 650 is located at the front end, the swirl regulating tube is connected to the air guide tube 610 to form a straight wind channel.

[0046] The cyclone includes a cyclone front cover, a cyclone rear cover 640 and blades 630. The blades 630 are installed between the cyclone front cover and the cyclone rear cover 640. The sealing section of the cyclone regulating tube 650 is connected to the cyclone rear cover 640. The air guide tube 610 is connected to the cyclone front cover 620. In this embodiment, the cyclone front cover is a part of the front partition 710. Figure 4 As an example, the blade 630 is a single body, with 6 blades evenly distributed and installed in a positive direction, and the airflow is guided by the blade 630 to form a right-handed rotating wind. The inner diameter of the cyclone rear cover 640 is consistent with the inner edge contour of the blade 630, and is flexibly matched with the outer diameter of the sealing section of the swirl regulating tube 650.

[0047] The vortex adjuster is located in the internal cavity, one end of the vortex adjuster is connected to the cyclone, and the other end is connected to the rear end of the air inlet housing 100. The vortex adjuster includes a vortex adjusting tube 650 and a rear sleeve 680, the rear sleeve 680 is installed at the rear end of the internal cavity, and the tail end of the rear sleeve 680 is closed. The vortex adjusting tube 650 includes a slotted section and a sealing section, and the slotted section of the vortex adjusting tube 650 is sleeve-connected with the rear sleeve 680; further preferably, the inner diameter of the rear sleeve 680 and the slotted section of the vortex adjusting tube 650 are matched or the outer diameter is movably matched. The sealing section of the vortex adjusting tube 650 is connected to the rear cover 4 of the cyclone, and the air guide 610 is connected to the front cover of the cyclone. As an example, the sealing section of the vortex adjusting tube 650 is a smooth tube, and the slotted section of the vortex adjusting tube 650 is a pipe with 6 evenly distributed slots on the surface. As an example, the slotted equivalent cross-section of the slotted section of the swivel regulating tube 650 is consistent with the equivalent cross-section formed by the blade 630, and both are in the shape of a long slot. The regulator regulates the forward and backward movement of the swivel regulating tube 650 between the rear sleeve 680 and the air guide tube 610. In order to limit the displacement distance of the swivel regulating tube 650, the outer wall of the swivel regulating tube 650 in this embodiment has a protruding structure, and is located at the connection between the sealing section and the slotted section of the swivel regulating tube 650. Figure 4 As shown, when the swirl regulating tube 650 is located at the front end, the protruding structure contacts the cyclone rear cover 640, limiting the swirl regulating tube 650 from further moving forward.

[0048] The regulator includes an adjustment structure 690 and a connecting rod 660. The adjustment structure 690 is installed on the outside of the air inlet housing 100. One end of the connecting rod 660 is connected to the adjustment structure 690, and the other end is connected to the rotary adjustment tube 650. In order to facilitate the connection with the connecting rod 660, the outer wall of the rotary adjustment tube 650 has a protruding ear-shaped connection structure. The connecting rod 660 is connected to the ear-shaped connection structure, and the ear-shaped connection structure is located at the connection between the sealing section and the slotted section of the rotary adjustment tube 650. The adjustment structure 690 is a threaded rotation conversion linear pulling method, and is located on the outside of the air inlet housing 100 and connected to the connecting rod 660. Specifically, the adjustment structure 690 includes an outer spiral tube 691 and an inner spiral tube 692, the front end of the outer spiral tube 691 is fixed to the outside of the air inlet housing 100, the front end of the inner spiral tube 692 is connected to the rear end of the outer spiral tube 691 through a thread, the connecting rod 660 is sleeved in the outer spiral tube 691 and the inner spiral tube 692, the front end of the connecting rod 660 is connected to the adjusting tube 650, and the rear end of the connecting rod 660 is connected to the rear end of the inner spiral tube 692. In order to facilitate adjustment, the rear end of the inner spiral tube 692 has a handle 693 structure.

[0049] The operation process of the adjustment structure 690 shown in this embodiment is as follows: by rotating the handle 693 on the outside of the adjustment structure 690, the connecting rod 660 can be driven to move forward or backward, thereby linking the adjustment tube 650 to move forward and backward, so that the airflow can be converted between the air inlet groove formed by the tangential blades and the straight groove at the rear end of the adjustment tube.

[0050] The operation process of the rotating airflow regulating structure 600 shown in this embodiment is as follows: Figure 6 As shown, when the swirl regulating tube 650 is located at the rear end, the cyclone is connected to the air guide 610 to form a cyclone channel. Specifically, when the swirl regulating tube 650 is located at the rear end, the slotted section of the swirl regulating tube 650 is located at the rear sleeve 680, the straight slot of the slotted section is closed by the rear sleeve 680, and the air inlet slot formed by the tangential blades of the cyclone is opened. In this way, the airflow enters the primary airflow channel from the air inlet of the air inlet shell 670, and then flows through the air inlet slot formed by the tangential blades of the cyclone to form a rotating airflow, and finally is discharged from the air guide 610. Combined with Figure 7As shown, when the swirl regulating tube is located at the front end, the swirl regulating tube is connected with the air guide tube to form a straight air channel. Specifically, when the swirl regulating tube 650 is located at the front end, the slotted section of the swirl regulating tube 650 leaves the rear sleeve 680, the straight slot of the slotted section is opened, and the sealing section of the swirl regulating tube 650 is located in the cyclone, so the air inlet slot formed by the tangential blades of the cyclone is closed. In this way, the airflow enters the primary airflow channel from the air inlet of the air inlet housing 100, and then flows through the straight slot of the slotted section of the swirl regulating tube 650 and enters the sealing section of the swirl regulating tube 650. An axial airflow is formed and finally discharged from the air guide tube 610.

[0051] The rear end of the air duct 610 is mounted on the front baffle 710, and the front end of the air duct 610 is mounted at the air outlet of the nozzle 300 and extends outside the air outlet of the nozzle 300. The air duct 610 is located at the coaxial center of the nozzle 300, and a plurality of the secondary air flow ducts 510 are mounted around the air duct 610.

[0052] The angle position of the air regulating plate 210 of the graded air distribution device of the present invention can be arbitrarily adjusted between 0°-180°, and the primary airflow and the secondary airflow can be adjusted between 5%-95%. At the same time, the primary airflow is adjustable between direct air and swirl air. Thus, the ratio and rotation intensity of the primary and secondary air ejected at the nozzle can be changed, and flames of different shapes can be obtained when used on the burner. The primary airflow and the secondary airflow can flow into a maximum of 95% of the combustion air, and the air regulating plate 210 is located in the middle state. When the air flow and pressure of the main pipe allow, the total flow of the combustion air is close to twice that of the primary airflow or the secondary airflow, so that the burner can obtain a larger adjustment ratio.

[0053] Combination Figure 6 As shown, the first working state of the graded air distribution device of the present invention is: the rotating airflow regulating structure 600 is adjusted to the first state, that is, the swirl regulating tube 650 is located at the rear end, the air inlet channel is a cyclone channel, the air regulating plate 210 is adjusted to the first extreme position, the secondary airflow channel is closed, and the primary airflow forms a pressure chamber between the front baffle 710 and the rear baffle 720. 95% of the combustion-supporting air blown into the air inlet shell 100 forms a rotating airflow after passing through the cyclone channel, and a tangential swirl wind, that is, a radial diffusion airflow, is formed at the primary airflow nozzle. The secondary airflow located on the outside is very small and is controlled at about 5%.

[0054] Combination Figure 7As shown, the second working state of the graded air distribution device of the present invention is: the rotating airflow regulating structure 600 is adjusted to the second state, that is, the swirl regulating tube 650 is located at the front end, the air inlet channel is a straight air channel, the air regulating plate 210 is adjusted to the first extreme position, the secondary airflow channel is closed, and the primary airflow forms a pressure chamber between the front partition 710 and the rear partition 720. 95% or more of the combustion-supporting air blown into the air inlet shell 100 passes through the cyclone channel to form axial wind, and axial direct current wind is formed at the primary airflow nozzle, and the secondary airflow located on the outside is controlled at about 5%.

[0055] Combination Figure 8 As shown, the third working state of the graded air distribution device of the present invention is: adjusting the air regulating plate 210 to the second extreme position, closing the primary air flow channel, and the secondary air flow forms a pressure chamber in front of the secondary air flow nozzle through the secondary air flow duct 510, and 95% or more of the combustion-supporting air blown into the air inlet shell 100 forms a diffused airflow at the secondary air flow nozzle, and the primary air flow on the inner side is controlled at about 5%.

[0056] Combination Fig. 9 As shown, the fourth working state of the graded air distribution device of the present invention is: the air regulating plate 210 is adjusted to the middle position, and the combustion-supporting air blown into the air inlet housing 100 forms 50% primary airflow and 50% secondary airflow. The swirl airflow regulating structure 600 is adjusted to the swirl position, and 50% of the primary airflow is swirl wind.

[0057] Combination Fig.10 As shown, the fifth working state of the graded air distribution device of the present invention is: the air regulating plate 210 is adjusted to the middle position, and the combustion-supporting air blown into the air inlet housing 100 forms 50% primary airflow and 50% secondary airflow. A rotating airflow regulating structure 600 is adjusted to the DC position, and 50% of the primary airflow is DC air.

[0058] Other working states of the graded air distribution device of the present invention are not listed one by one. The graded air distribution device of the present invention can change the ratio and rotation intensity of the primary and secondary air ejection at the nozzle through the above-mentioned rotating airflow adjustment structure 690 and the position of the air regulating plate. When used on the burner, flames of different shapes can be obtained, which can be suitable for different furnace shapes and improve the fuel mixing effect. The combustion speed of the fuel is controlled by graded air distribution, so that the emission of NOx in the flue gas can be effectively reduced.

[0059] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "inside", "outside", "front", and back, etc., are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0060] Therefore, the present invention effectively overcomes various shortcomings in the prior art and has a high industrial utilization value. The above embodiments are only illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology can modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A graded air distribution device, characterized in that: include: An air inlet housing, an air regulating device, a nozzle, a primary air flow channel, a secondary air flow channel and a rotating air flow regulating structure; The air inlet housing comprises an internal cavity, an air inlet and an air outlet; The nozzle is connected to the air outlet of the air inlet housing; the air regulating device is installed at the air inlet of the air inlet housing; the primary air flow channel and the secondary air flow channel are located in the internal cavity of the air inlet housing, and the primary air flow channel and the secondary air flow channel are relatively independent; The air regulating device comprises an air regulating plate, which rotates and stays at at least two extreme positions. When the air regulating plate is at an intermediate position, the inlet of the primary air flow channel and the inlet of the secondary air flow channel are opened at the same time; when the air regulating plate is at a first extreme position, the inlet of the secondary air flow channel is closed, and the inlet of the primary air flow channel is opened; when the air regulating plate is at a second extreme position, the inlet of the primary air flow channel is closed, and the inlet of the secondary air flow channel is opened; The rotating airflow regulating structure comprises an air inlet channel, the air inlet channel is connected with the primary airflow channel, the rotating airflow regulating structure is provided with a first state and a second state, when the rotating airflow regulating structure is in the first state, the air inlet channel forms a cyclone channel; when the rotating airflow regulating structure is in the second state, the air inlet channel forms a straight air channel; a front baffle and a rear baffle are provided in the internal cavity of the air inlet shell, the front baffle is located at the air outlet of the air inlet shell, the rear baffle is located at the air inlet of the air inlet shell, the rear baffle divides the internal cavity into a first cavity through which the primary airflow passes and a second cavity through which the secondary airflow passes; the secondary airflow channel comprises a plurality of secondary airflow ducts, the front end of the secondary airflow duct is mounted on the front baffle and is connected with the nozzle; the rear end of the secondary airflow duct is mounted on the rear baffle and is connected with the second cavity through which the secondary airflow passes, the second cavity, the secondary airflow duct and the nozzle form the secondary airflow channel; The rotating airflow regulating structure comprises an air guide pipe, a cyclone, a swirl regulator and a regulator; The air guide pipe is located at the outlet of the nozzle; The vortex adjuster and the cyclone are located in the internal cavity. The vortex adjuster includes a rear sleeve and a vortex adjusting tube. The rear sleeve is installed at the tail end of the internal cavity. The vortex adjusting tube includes a slotted section and a sealing section. The slotted section of the vortex adjusting tube is sleeve-connected with the rear sleeve. One end of the cyclone is connected to the sealing section of the swirl regulating tube, and the other end of the cyclone is connected to the air guide tube; The regulator is connected to the swivel tube, and the regulator adjusts the forward and backward movement of the swivel tube between the rear sleeve and the air guide tube; When the cyclone regulating tube is located at the rear end, the cyclone device is connected with the air guide tube to form a cyclone channel; When the swirl regulating tube is located at the front end, the swirl regulating tube is connected with the air guide tube to form a straight air channel; The rear end of the air duct is installed on the front baffle, and the front end of the air duct is installed at the air outlet of the nozzle and extends outside the air outlet of the nozzle; the air duct is located at the coaxial center position of the nozzle, and a plurality of secondary air flow ducts are installed around the air duct.

2. The graded air distribution device according to claim 1, characterized in that: A secondary airflow nozzle is provided at the air outlet of the nozzle pipe, and the secondary airflow nozzle is a nozzle hole at different angles or a nozzle hole composed of blades at a certain angle.

3. The graded air distribution device according to claim 1, characterized in that: The cyclone comprises a cyclone front cover, a cyclone rear cover and blades, wherein the blades are installed between the cyclone front cover and the cyclone rear cover, the sealing section of the cyclone regulating pipe is connected to the cyclone rear cover, and the air guide pipe is connected to the cyclone front cover.

4. The graded air distribution device according to claim 1, characterized in that: The regulator comprises an adjusting structure and a connecting rod. The adjusting structure is installed on the outside of the air inlet housing. One end of the connecting rod is connected to the adjusting structure, and the other end is connected to the swivel regulating tube.

5. The graded air distribution device according to claim 1, characterized in that: The position adjustment range of the air regulating plate is between 0°-180°, and the percentage of the primary airflow to the secondary airflow obtained is between 5%-95%. By adjusting the state of the rotating airflow regulating structure, the primary airflow can be converted between direct current wind, swirl wind and direct current swirl mixed wind.

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