An external rotor high-frequency blower

Abstract

The present invention relates to the technical field of fans, and particularly relates to an external rotor high-frequency fan, which includes a central pipeline and a digital display control panel. The central pipeline is arranged vertically in the axial direction, and a fan main body capable of forming an air flow in the upward direction from the bottom is arranged therein. A spiral liquid guide channel for forming a spiral water flow flowing downward is arranged on the inner side wall of the central pipeline; the upper and lower ends of the central pipeline are respectively sealed and connected with an upper ventilation pipeline and a lower ventilation pipeline, and an opening and closing structure for controlling the on-off of the air flow therein is arranged in the upper ventilation pipeline; through the mutual cooperation of the central pipeline, the spiral liquid guide channel, the upper ventilation pipeline, the lower ventilation pipeline, the opening and closing structure, the water tank and the water supply structure, etc., an external water circulation for cooling the fan can be realized. During this process, rapid cooling of the fan main body can be achieved, and particulate impurities in the flue gas can be absorbed.

Description

Technical Field

[0001] The present invention relates to the technical field of fans, and particularly to an external rotor high-frequency fan. Background Art

[0002] The external rotor fan is a special type of fan. Its main feature is that the stator is located in the middle of the motor, while the rotor is located on the outside. This design enables the external rotor fan to have a series of unique advantages and application scenarios, and it is widely used in occasions such as air heaters, heat pumps, condensers, cooling units, evaporators, air supply or heat dissipation for electronic devices, etc.

[0003] An external rotor fan with the publication number of CN221380708U includes a housing, an impeller, a stator assembly, a rotor assembly, and an output shaft. The housing includes a first end cover and a second end cover. The impeller is installed on the first end cover. The stator assembly and the rotor assembly are arranged inside the first end cover. The rotor assembly is coaxially arranged with the stator assembly, and the rotor assembly is arranged outside the stator assembly.

[0004] An exhaust fan with the publication number of CN203702595U includes a fan body. The fan body is connected with a smoke inlet, a smoke outlet, and a cold air inlet through an air duct. The cold air inlet is arranged near the smoke inlet, and a valve is provided on the cold air inlet. The valve is connected with a valve opening controller. A temperature control meter is arranged inside the smoke outlet, and the temperature control meter is connected with the valve opening controller through an exhaust fan control device. The outer surface of the exhaust fan is coated with a fireproof layer.

[0005] Currently, the heat dissipation methods adopted by external rotor fans are mostly heat sinks or internal circulation water cooling methods. When dealing with high-temperature flue gas in fire protection applications, the high temperature and particulate impurities in the flue gas greatly affect the service life of the fan, and the heat dissipation methods also cannot quickly cool down the fan. Summary of the Invention

[0006] (I) Technical Problems to be Solved

[0007] The purpose of the present invention is to provide an external rotor high-frequency fan to solve the above problems.

[0008] (II) Technical Solutions

[0009] To achieve the above purpose, the present invention provides the following technical solutions:

[0010] An external rotor high-frequency fan provided by the present invention includes a central pipe and a digital display control panel. The central pipe is arranged vertically in the axial direction, and a fan main body capable of forming an air flow in the upward direction from bottom to top is arranged inside it. A spiral liquid guide channel for forming a spiral water flow flowing downward is arranged on the inner side wall of the central pipe;

[0011] The upper and lower ends of the central pipe are respectively sealed and connected with an upper ventilation pipe and a lower ventilation pipe, and an opening and closing structure for controlling the on-off of the air flow therein is arranged in the upper ventilation pipe;

[0012] A water tank is arranged on one side of the central pipe, and a return water cooling structure for cooling the water liquid in the ventilation pipe and recycling it back into the water tank is arranged between the bottom of the water tank and the bottom end of the lower ventilation pipe. A water supply structure for supplying water liquid into the central pipe to absorb flue gas impurities and cool down is arranged on the water tank.

[0013] Furthermore, an upper cover is arranged at the upper end of the spiral liquid guide channel. The cross-sectional shape of the spiral liquid guide channel is L-shaped. A spiral water guide groove is formed between the spiral liquid guide channel and the inner side wall of the central pipe. A plurality of water dripping holes are arranged at the bottom of the spiral liquid guide channel close to the inner side wall of the central pipe along its spiral direction. The cross-sectional area of the water dripping holes is less than one-tenth of the cross-sectional area of the spiral water guide groove.

[0014] Furthermore, the water supply structure includes a second water pump arranged in the water tank. One end of a water suction pipe is connected to the water inlet of the second water pump, and the other end of the water suction pipe extends to the inner bottom surface of the water tank. One end of a water outlet pipe is connected to the water outlet of the second water pump, and the other end of the water outlet pipe sequentially passes through the water tank, the central pipe and the spiral liquid guide channel and extends into the central pipe to be connected with an annular water passing pipe. A plurality of water outlet nozzles are arranged on the lower side of the annular water passing pipe along its circumferential direction. A water outlet hole for introducing water liquid into the spiral liquid guide channel is arranged on the water outlet pipe located in the spiral liquid guide channel. The output end of the digital display control panel is electrically connected to the input end of the second water pump.

[0015] Furthermore, the opening and closing structure includes an inner collar fixedly sleeved in the upper ventilation pipe. An opening and closing rotating plate is arranged in the inner collar. The opening and closing rotating plate is rotatably arranged in the inner collar through a rotating shaft. A motor for driving the opening and closing rotating plate to rotate under the support of the rotating shaft is fixedly arranged on the upper ventilation pipe. An upper limit sealing strip is arranged on the inner side wall of the upper port of the inner collar, and a lower limit sealing strip is arranged on the inner side wall of the lower port of the inner collar. When the motor drives the opening and closing rotating plate to rotate to a horizontal state, the opening and closing rotating plate can cooperate with the upper limit sealing strip and the lower limit sealing strip to disconnect the upper ventilation pipe. When the motor drives the opening and closing rotating plate to rotate to the set state, the upper ventilation pipe is in an open state and is communicated with the central pipe. The output end of the digital display control panel is electrically connected to the input end of the motor.

[0016] Furthermore, one side of the lower ventilation pipe is connected with a smoke inlet pipe through an L-shaped pipe. The axial direction of the lower ventilation pipe is perpendicular to the axial direction of the smoke inlet pipe. A filter layer is arranged in the lower ventilation pipe below the L-shaped pipe. The outer shape of the filter layer is a cone shape with a wider upper part and a narrower lower part.

[0017] Furthermore, the return water cooling structure includes a first water pump disposed below the water tank. One end of a lower liquid extraction pipe is connected to the water inlet of the first water pump, and the other end of the lower liquid extraction pipe extends to the inside of the bottom end of the lower ventilation pipe. The water outlet of the first water pump is connected to a liquid guiding joint, and a solenoid valve is disposed on the lower liquid extraction pipe;

[0018] The return water cooling structure further includes an upper liquid outlet pipe disposed in the water tank. The upper end of the upper liquid outlet pipe extends to the inner top surface of the water tank, and the lower end of the upper liquid outlet pipe passes through the bottom side of the water tank and is connected to the liquid guiding joint through a cooling pipe sheet. The output end of the digital display control panel is electrically connected to the input ends of the solenoid valve and the first water pump respectively.

[0019] Furthermore, a liquid adding pipe is disposed on the upper side of the water tank, and a cover is detachably disposed on the liquid adding pipe. A liquid level sensor for detecting the liquid level height inside the water tank is disposed on the inner top surface of the water tank. A support plate is disposed on the water tank, and both ends of the support plate are fixedly connected to the water tank and the central pipe respectively. The outer shape of the water tank is rectangular, and feet are fixedly disposed at the four corners of the lower side of the water tank. The output end of the liquid level sensor is electrically connected to the input end of the digital display control panel.

[0020] Furthermore, the fan main body includes a central shaft disposed in the central pipe. Both ends of the central shaft are fixedly disposed in the central pipe through support shafts. An inner stator is disposed on the central shaft, and an outer rotor is rotatably disposed outside the inner stator. An outer rotating shell is fixedly disposed outside the outer rotor. A plurality of fan blades are disposed on the outer side of the outer rotating shell along the circumferential direction thereof, and the outer rotating shell is rotatably connected to the central shaft through a bearing.

[0021] Furthermore, a water delivery hole passage is opened in the central shaft. The lower end of the water delivery hole passage is open, and the upper end is located above the inner stator. A plurality of water through holes are opened on the outer side wall of the central shaft near the upper end of the water delivery hole passage. A water collecting hopper is fixedly disposed on the outer side wall of the central shaft between the water through holes and the inner stator. The outer shape of the water collecting hopper is a conical shell shape with a wider upper part and a narrower lower part.

[0022] Furthermore, a temperature sensor for detecting the air temperature inside the upper ventilation pipe is disposed inside the upper ventilation pipe. The output end of the temperature sensor is electrically connected to the input end of the digital display control panel.

[0023] (III) Beneficial effects

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] 1. Through the mutual cooperation of the central pipeline, spiral liquid guiding channel, upper ventilation pipeline, lower ventilation pipeline, opening and closing structure, water tank, and water supply structure, etc., the external water-liquid circulation for the heat dissipation of the fan can be realized. During this process, the rapid cooling of the fan main body can be achieved, and the particulate impurities in the flue gas can be absorbed.

[0026] 2. The water supply structure has two functions. The first function is to cooperate with the spiral liquid guiding channel to form a water curtain on the inner wall of the central pipeline. The second function is to form a water mist through the cooperation of the water outlet nozzle and the fan blade. The combination of the water curtain and the water mist greatly improves the cooling of the fan main body and the fire prevention and smoke absorption ability in the central pipeline.

[0027] 3. The opening and closing structure can realize the opening and closing control of the upper ventilation pipeline. The lower ventilation pipeline, L-shaped pipeline, and return water cooling structure, etc., cooperate with each other to form a U-shaped water seal at the connection between the L-shaped pipeline and the central pipeline, so as to realize the disconnection and sealing of the lower ventilation pipeline and prevent the spread of fire outward.

[0028] 4. The return water cooling structure recovers the water-liquid back into the water tank, thereby realizing the independent supply of the water-liquid. The return water cooling structure can realize the recycling of the water-liquid after cooling and temperature reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0030] Figure 1 is the front view structural schematic diagram of the present invention;

[0031] Figure 2 is the present invention Figure 1 the left view structural schematic diagram;

[0032] Figure 3 is the present invention Figure 1 the three-dimensional structural schematic diagram;

[0033] Figure 4 is the present invention Figure 2 the A-A sectional view structural schematic diagram;

[0034] Figure 5 is the present invention Figure 4 the enlarged partial structural schematic diagram at B;

[0035] Figure 6 is the present invention Figure 4 the enlarged partial structural schematic diagram at C;

[0036] Figure 7 is a schematic diagram of the enlarged structure of the local part at D of the present invention; Figure 4

[0037] Figure 8 is a three-dimensional structure schematic diagram of another direction of the present invention; Figure 1

[0038] Figure 9 is a schematic sectional structure diagram of the opening and closing structure of the present invention.

[0039] Explanation of the reference numerals in the drawings is as follows: 1, central pipeline; 101, spiral liquid guiding channel; 102, upper cover; 103, water dripping hole; 104, central axis; 105, inner stator; 106, outer rotor; 107, outer rotating shell; 108, bearing; 109, water collecting hopper; 110, water passing hole; 111, water conveying pipeline; 112, support shaft; 113, fan blade; 2, upper ventilation pipeline; 3, lower ventilation pipeline; 301, smoke inlet pipeline; 302, L-shaped pipeline; 303, filter layer; 4, opening and closing structure; 401, inner sleeve ring; 402, upper limit sealing strip; 403, opening and closing rotating plate; 404, rotating shaft; 405, motor; 406, lower limit sealing strip; 5, water tank; 501, liquid adding pipe; 502, cover; 503, support plate; 6, return water cooling structure; 601, cooling pipeline sheet; 602, upper liquid outlet pipe; 603, liquid guiding joint; 604, solenoid valve; 605, lower liquid pumping pipe; 606, first water pump; 7, water supply structure; 701, second water pump; 702, water suction pipe; 703, water outlet pipe; 704, water outlet hole; 705, annular water passing pipeline; 706, water outlet nozzle; 8, liquid level sensor; 9, digital display control panel; 10, temperature sensor. Detailed implementation manners

[0040] In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation manners obtained by those of ordinary skill in the art without making creative efforts fall within the scope protected by the present invention.

[0041] Refer to Figures 1-9 ​​As shown in the figure, the present invention provides an outer rotor high-frequency fan, which includes a central pipe 1 and a digital display control panel 9. The central pipe 1 is arranged vertically in the axial direction, and a fan main body capable of forming an air flow in the upward direction from bottom to top is arranged therein. A spiral liquid guide channel 101 for forming a spiral water flow flowing downward is arranged on the inner side wall of the central pipe 1; the upper and lower ends of the central pipe 1 are respectively sealed and connected with an upper ventilation pipe 2 and a lower ventilation pipe 3. An opening and closing structure 4 for controlling the on-off of the air flow therein is arranged in the upper ventilation pipe 2; a water tank 5 is arranged on one side of the central pipe 1. A return water cooling structure 6 for cooling the water liquid in the ventilation pipe 3 and re-transporting it into the water tank 5 for recycling is arranged between the bottom of the water tank 5 and the bottom end of the lower ventilation pipe 3. A water supply structure 7 for supplying water liquid to the central pipe 1 to absorb flue gas impurities and cool down is arranged on the water tank 5.

[0042] See the attached drawings of the specification Figure 6 As shown in the figure, an upper cover 102 is arranged at the upper end of the spiral liquid guide channel 101. The cross-sectional shape of the spiral liquid guide channel 101 is L-shaped. A spiral water guide groove is formed between the spiral liquid guide channel 101 and the inner side wall of the central pipe 1. A plurality of water dripping holes 103 are arranged along the spiral direction at the bottom of the spiral liquid guide channel 101 close to the inner side wall of the central pipe 1. The cross-sectional area of the water dripping holes 103 is less than one-tenth of the cross-sectional area of the spiral water guide groove.

[0043] See the attached drawings of the specification Figure 4 and Figure 6 As shown in the figure, the water supply structure 7 includes a second water pump 701 arranged in the water tank 5. One end of a water suction pipe 702 is connected to the water inlet of the second water pump 701, and the other end of the water suction pipe 702 extends to the inner bottom surface of the water tank 5. One end of a water outlet pipe 703 is connected to the water outlet of the second water pump 701, and the other end of the water outlet pipe 703 sequentially passes through the water tank 5, the central pipe 1 and the spiral liquid guide channel 101 and extends into the central pipe 1 to be connected with an annular water passing pipe 705. A plurality of water outlet nozzles 706 are arranged along the circumferential direction on the lower side of the annular water passing pipe 705. A water outlet hole 704 for introducing water liquid into the spiral liquid guide channel 101 is arranged on the water outlet pipe 703 located in the spiral liquid guide channel 101. The output end of the digital display control panel 9 is electrically connected to the input end of the second water pump 701. Through the above specific structural design, the water supply structure 7 has two functions. The first function is to cooperate with the spiral liquid guide channel 101 to form a water curtain on the inner wall of the central pipe 1. The second function is to form water mist by the cooperation of the water outlet nozzles 706 and the fan blades 113. Through the cooperation of the water curtain and the water mist, the cooling of the fan main body and the fire prevention and smoke absorption ability in the central pipe 1 are greatly improved.

[0044] See the attached drawings of the specification Figure 1 、 Figure 4 and Figure 5As shown in the figure, the opening and closing structure 4 includes an inner collar 401 fixedly sleeved in the upper ventilation pipe 2. An opening and closing rotating plate 403 is arranged inside the inner collar 401. The opening and closing rotating plate 403 is rotatably arranged inside the inner collar 401 through a rotating shaft 404. A motor 405 for driving the opening and closing rotating plate 403 to rotate under the support of the rotating shaft 404 is fixedly arranged on the upper ventilation pipe 2. An upper limit sealing strip 402 is arranged on the inner side wall of the upper port of the inner collar 401, and a lower limit sealing strip 406 is arranged on the inner side wall of the lower port of the inner collar 401. When the motor 405 drives the opening and closing rotating plate 403 to rotate to the horizontal state, the opening and closing rotating plate 403, in cooperation with the upper limit sealing strip 402 and the lower limit sealing strip 406, can disconnect the upper ventilation pipe 2. When the motor 405 drives the opening and closing rotating plate 403 to rotate to the set state, the upper ventilation pipe 2 is in an open state and is connected to the central pipe 1. The output end of the digital display control panel 9 is electrically connected to the input end of the motor 405. Through the above specific structural design, the outer contour of the upper limit sealing strip 402 and the lower limit sealing strip 406 is in an arc shape less than 180 degrees. Thus, without affecting the 90-degree flip of the opening and closing rotating plate 403, the sealing effect of the opening and closing rotating plate 403 in the horizontal state can be achieved.

[0045] See the attached drawings of the specification Figure 1 and Figure 3 As shown in the figure, one side of the lower ventilation pipe 3 is connected to a smoke inlet pipe 301 through an L-shaped pipe 302. The axial direction of the lower ventilation pipe 3 and the axial direction of the smoke inlet pipe 301 are perpendicular to each other. A filter layer 303 is arranged inside the lower ventilation pipe 3 below the L-shaped pipe 302. The outer shape of the filter layer 303 is in a cone shape that is wider at the top and narrower at the bottom.

[0046] See the attached drawings of the specification Figure 1 and Figure 4 As shown in the figure, the return water cooling structure 6 includes a first water pump 606 arranged below the water tank 5. The water inlet of the first water pump 606 is connected to one end of a lower liquid extraction pipe 605, and the other end of the lower liquid extraction pipe 605 extends to the inside of the bottom end of the lower ventilation pipe 3. The water outlet of the first water pump 606 is connected to a liquid guiding joint 603. An electromagnetic valve 604 is arranged on the lower liquid extraction pipe 605; the return water cooling structure 6 further includes an upper liquid outlet pipe 602 arranged inside the water tank 5. The upper end of the upper liquid outlet pipe 602 extends to the inner top surface of the water tank 5, and the lower end of the upper liquid outlet pipe 602 passes through the bottom side of the water tank 5 and is connected to the liquid guiding joint 603 through a cooling pipe piece 601. The output end of the digital display control panel 9 is electrically connected to the input ends of the electromagnetic valve 604 and the first water pump 606 respectively.

[0047] See the attached drawings of the specification Figure 4 and Figure 8As shown in the figure, a liquid adding pipe 501 is provided on the upper side of the water tank 5. A cover 502 is detachably provided on the liquid adding pipe 501. A liquid level sensor 8 for detecting the liquid level height inside it is provided on the inner top surface of the water tank 5. A support plate 503 is provided on the water tank 5. The two ends of the support plate 503 are fixedly connected to the water tank 5 and the central pipe 1 respectively. The water tank 5 is in the shape of a cuboid. Support feet are fixedly provided at the four corners of the lower side of the water tank 5. The output end of the liquid level sensor 8 is electrically connected to the input end of the digital display control panel 9.

[0048] The main body of the fan includes a central shaft 104 provided in the central pipe 1. The two ends of the central shaft 104 are fixedly provided in the central pipe 1 through support shafts 112. An inner stator 105 is provided on the central shaft 104. An outer rotor 106 is rotatably provided outside the inner stator 105. An outer rotating shell 107 is fixedly provided outside the outer rotor 106. A plurality of fan blades 113 are provided on the outer circumference of the outer rotating shell 107. The outer rotating shell 107 is rotatably connected to the central shaft 104 through a bearing 108. A water delivery channel 111 is provided inside the central shaft 104. The lower end of the water delivery channel 111 is open and the upper end is located above the inner stator 105. A plurality of water through holes 110 are provided on the outer side wall of the central shaft 104 near the upper end of the water delivery channel 111. A water collecting hopper 109 is fixedly provided on the outer side wall of the central shaft 104 between the water through holes 110 and the inner stator 105. The water collecting hopper 109 is in the shape of a conical shell with a wider upper part and a narrower lower part. Through the above specific structural design, when water enters at the connection of the outer rotating shell 107 and the bearing 108 of the central pipe 1, the water is collected by the water collecting hopper 109, and the water is discharged through the water through holes 110 and the water delivery channel 111 in sequence, greatly improving the waterproof and sealing performance of the main body of the fan.

[0049] A temperature sensor 10 for detecting the air temperature inside it is provided inside the upper ventilation pipe 2. The output end of the temperature sensor 10 is electrically connected to the input end of the digital display control panel 9.

[0050] The working principle and technical effects of the present invention:

[0051] During use, the main body of the fan operates. Driven by the rotation of the fan blades 113, an air flow from bottom to top is formed in the central duct 1. The air flow is sucked in from the lower ventilation duct 3 and discharged from the upper ventilation duct 2. When it is necessary to cool the main body of the fan, the second water pump 701 of the water supply structure 7 sequentially introduces water liquid into the central duct 1 through the suction pipe 702, the outlet pipe 703, the water outlet hole 704 and the water outlet nozzle 706. Among them, the water outlet hole 704 introduces the water liquid into the spiral water guide groove formed by the spiral liquid guide channel 101 and the inner wall of the central duct 1. When the water liquid in the spiral water guide groove flows, the water liquid flows downward along the inner wall of the central duct 1 through the water dripping holes 103, thereby forming a water curtain on the inner wall of the central duct 1. In addition, the water liquid sprayed by the water outlet nozzle 706 sprays towards the fan blades 113, and a water mist is formed under the high-speed rotation and cutting state of the fan blades 113. Thus, rapid cooling of the main body of the fan can be achieved. In addition, in the event of a fire, the central duct 1, the upper ventilation duct 2, the lower ventilation duct 3, etc. cooperate to discharge the smoke. At this time, the water curtain and the water mist can absorb the heat and particulate impurities in the smoke and gather and flow downward. The downward flowing water liquid is filtered by the filter layer 303, continues to flow downward, and falls into the bottom of the lower ventilation duct 3. The water return cooling structure 6 recovers the water liquid back into the water tank 5, thereby realizing the independent supply of the water liquid and avoiding the damage of the water supply pipe in the event of a fire;

[0052] When the water return cooling structure 6 recycles and uses the water liquid, the digital display control panel 9 controls to open the solenoid valve 604 and the first water pump 606. The first water pump 606 sequentially sends it into the water tank 5 through the lower liquid extraction pipe 605, the liquid guide joint 603, the cooling pipe sheet 601 and the upper liquid outlet pipe 602. Among them, the outer contour of the cooling pipe sheet 601 is in a continuous S shape, which is used to increase the cooling area of the cooling pipe sheet 601;

[0053] When the temperature sensor 10 detects that the temperature exceeds a certain temperature, the digital display control panel 9 controls the motor 405 to drive the opening and closing rotating plate 403 to rotate to the horizontal state, so that the outer edges of the opening and closing rotating plate 403 are hermetically fitted with the upper limit sealing strip 402 and the lower limit sealing strip 406 respectively, thereby realizing the disconnection of the upper ventilation duct 2. The digital display control panel 9 controls the solenoid valve 604 to disconnect the lower liquid extraction pipe 605, and the water liquid accumulates in the lower ventilation duct 3 until a U-shaped water seal is formed at the connection between the L-shaped pipe 302 and the central duct 1, thereby realizing the disconnection and sealing of the lower ventilation duct 3 and preventing the spread of the fire outward.

[0054] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, and all should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. An external rotor high-frequency fan, characterized in that: It includes a central pipe (1) and a digital display control panel (9). The central pipe (1) is axially vertically arranged and a fan body capable of forming an air flow in the upward direction from bottom to top is arranged therein. A spiral liquid guide channel (101) for forming a spiral water flow flowing downward is arranged on the inner side wall of the central pipe (1); The upper and lower ends of the central pipe (1) are respectively sealed and connected with an upper ventilation pipe (2) and a lower ventilation pipe (3). An opening and closing structure (4) for controlling the on-off of the air flow therein is arranged in the upper ventilation pipe (2); A water tank (5) is arranged on one side of the central pipe (1). A return water cooling structure (6) for cooling the water liquid in the lower ventilation pipe (3) and re-transporting it into the water tank (5) for recycling is arranged between the bottom of the water tank (5) and the bottom end of the lower ventilation pipe (3). A water supply structure (7) for supplying water liquid into the central pipe (1) to absorb flue gas impurities and cool down is arranged on the water tank (5); An upper cover (102) is arranged at the upper end of the spiral liquid guide channel (101). The cross-sectional shape of the spiral liquid guide channel (101) is L-shaped. A spiral water guide groove is formed between the spiral liquid guide channel (101) and the inner side wall of the central pipe (1). A plurality of water dripping holes (103) are arranged along the spiral direction at the bottom of the spiral liquid guide channel (101) close to the inner side wall of the central pipe (1). The cross-sectional area of the water dripping holes (103) is less than one-tenth of the cross-sectional area of the spiral water guide groove; The water supply structure (7) includes a second water pump (701) arranged in the water tank (5). One end of a water suction pipe (702) is connected to the water inlet of the second water pump (701). The other end of the water suction pipe (702) extends to the inner bottom surface of the water tank (5). One end of a water outlet pipe (703) is connected to the water outlet of the second water pump (701). The other end of the water outlet pipe (703) sequentially passes through the water tank (5), the central pipe (1) and the spiral liquid guide channel (101) and extends into the central pipe (1) to be connected with an annular water passing pipe (705). A plurality of water outlet nozzles (706) are arranged along the circumferential direction on the lower side of the annular water passing pipe (705). A water outlet hole (704) for introducing water liquid into the spiral liquid guide channel (101) is arranged on the water outlet pipe (703) located in the spiral liquid guide channel (101). The output end of the digital display control panel (9) is electrically connected to the input end of the second water pump (701); The fan body includes a central shaft (104) arranged in the central pipe (1). Both ends of the central shaft (104) are fixedly arranged in the central pipe (1) through support shafts (112). An inner stator (105) is arranged on the central shaft (104). An outer rotor (106) is rotatably arranged on the outer side of the inner stator (105). An outer rotating shell (107) is fixedly arranged on the outer side of the outer rotor (106). A plurality of fan blades (113) are arranged along the circumferential direction on the outer side of the outer rotating shell (107). The outer rotating shell (107) is rotatably connected to the central shaft (104) through a bearing (108); A water delivery channel (111) is formed inside the central shaft (104). The lower end of the water delivery channel (111) is open, and the upper end is located above the inner stator (105). A plurality of water through holes (110) are formed on the outer side wall of the central shaft (104) near the upper end of the water delivery channel (111). A water collecting hopper (109) is fixedly arranged on the outer side wall of the central shaft (104) between the water through holes (110) and the inner stator (105). The water collecting hopper (109) is in the shape of a conical shell with a wider upper part and a narrower lower part.

2. The external-rotor high-frequency blower according to claim 1, wherein: The opening and closing structure (4) includes an inner collar (401) fixedly sleeved inside the upper ventilation pipe (2). An opening and closing rotating plate (403) is arranged inside the inner collar (401). The opening and closing rotating plate (403) is rotatably arranged inside the inner collar (401) through a rotating shaft (404). A motor (405) for driving the opening and closing rotating plate (403) to rotate under the support of the rotating shaft (404) is fixedly arranged on the upper ventilation pipe (2). An upper limit sealing strip (402) is arranged on the inner side wall of the upper port of the inner collar (401), and a lower limit sealing strip (406) is arranged on the inner side wall of the lower port of the inner collar (401). When the motor (405) drives the opening and closing rotating plate (403) to rotate to the horizontal state, the opening and closing rotating plate (403) cooperates with the upper limit sealing strip (402) and the lower limit sealing strip (406) to disconnect the upper ventilation pipe (2). When the motor (405) drives the opening and closing rotating plate (403) to rotate to the set state, the upper ventilation pipe (2) is in an open state and is in communication with the central pipe (1). The output end of the digital display control panel (9) is electrically connected to the input end of the motor (405).

3. The external-rotor high-frequency blower according to claim 1, wherein: One side of the lower ventilation pipe (3) is connected with a smoke inlet pipe (301) through an L-shaped pipe (302). The axial direction of the lower ventilation pipe (3) is perpendicular to the axial direction of the smoke inlet pipe (301). A filter layer (303) is arranged inside the lower ventilation pipe (3) below the L-shaped pipe (302). The filter layer (303) is in the shape of a cone with a wider upper part and a narrower lower part.

4. The external-rotor high-frequency blower according to claim 1, wherein: The return water cooling structure (6) includes a first water pump (606) arranged below the water tank (5). One end of a lower liquid extraction pipe (605) is connected to the water inlet of the first water pump (606), and the other end of the lower liquid extraction pipe (605) extends to the inside of the bottom end of the lower ventilation pipe (3). The water outlet of the first water pump (606) is connected with a liquid guiding joint (603). A solenoid valve (604) is arranged on the lower liquid extraction pipe (605); The return water cooling structure (6) further includes an upper liquid outlet pipe (602) arranged inside the water tank (5). The upper end of the upper liquid outlet pipe (602) extends to the inner top surface of the water tank (5). The lower end of the upper liquid outlet pipe (602) passes through the bottom side of the water tank (5) and is connected to the liquid guiding joint (603) through a cooling pipe sheet (601). The output end of the digital display control panel (9) is electrically connected to the input ends of the solenoid valve (604) and the first water pump (606) respectively.

5. The external rotor high-frequency blower according to claim 1, wherein: A liquid adding pipe (501) is arranged on the upper side of the water tank (5), and a sealing cover (502) is detachably arranged on the liquid adding pipe (501). A liquid level sensor (8) for detecting the liquid level height inside it is arranged on the inner top surface of the water tank (5). A support plate (503) is arranged on the water tank (5), and both ends of the support plate (503) are fixedly connected to the water tank (5) and the central pipeline (1) respectively. The outer shape of the water tank (5) is rectangular parallelepiped, and feet are fixedly arranged at the four corners of the lower side of the water tank (5). The output end of the liquid level sensor (8) is electrically connected to the input end of the digital display control panel (9).

6. The external-rotor high-frequency blower according to claim 1, wherein: A temperature sensor (10) for detecting the air temperature inside it is arranged inside the upper ventilation pipeline (2). The output end of the temperature sensor (10) is electrically connected to the input end of the digital display control panel (9).

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