A jet fan

Abstract

The present invention discloses a jet fan, and relates to the technical field of jet fans; it comprises a fan barrel, wherein a fan impeller driven by a fan drive motor is arranged in the fan barrel, and an impeller cleaning mechanism is arranged on the fan barrel. The present invention is provided with an impeller cleaning mechanism, and when cleaning is required, the annular rotating frame can be rotated based on the drive of a rotating drive unit, thereby driving the limit slide rail to move. Since one end of the limit slide rail extends toward the direction close to the fan barrel, the slide rod can be pressed into the fan barrel, thereby allowing the nozzle to reach the fan barrel after passing through an opening. Based on the operation of a liquid supply device, water is output to the fan impeller through the nozzle, thereby achieving flushing and cleaning, and the fan air flow rate is not affected when the fan is operating normally.

Description

Technical Field

[0001] The invention relates to the technical field of jet fans, and in particular to a jet fan. Background Art

[0002] With the acceleration of the industrialization process, various mechanical equipment plays an increasingly important role in production and life. Among them, fans, as a common fluid machinery, are widely used in ventilation, air conditioning, cooling and other fields. However, during the use of fans, due to long-term operation and environmental factors, dust, oil and other impurities are easily accumulated on the surface of the fan impeller, which not only affects the working efficiency of the fan, but also increases energy consumption and may even cause equipment failure. Therefore, it is very necessary to clean the fan impeller regularly; the traditional fan impeller cleaning method mainly relies on manual operation, which is time-consuming and labor-intensive.

[0003] During the use of the jet fan, the impeller needs to be cleaned regularly to ensure that the impeller surface is clean to ensure its normal operation. Existing jet fans generally do not have a structure for cleaning the impeller, and the jet fan is generally suspended at a high position. In order to clean the impeller, it is necessary to climb up to operate, which is not only troublesome to operate, but also has certain risks. Especially for jet fans in tunnels, climbing up to operate also affects traffic. Therefore, it is necessary to develop a jet fan that can automatically clean the impeller. If the impeller cleaning structure is set in the fan barrel, it will affect the circulation efficiency of the airflow. The present application aims to provide a jet fan that can automatically clean the impeller and does not affect the airflow during the operation of the jet fan. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings in the prior art and to propose a jet fan.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A jet fan comprises a fan cylinder, wherein a fan impeller driven by a fan drive motor is arranged in the fan cylinder, and an impeller cleaning mechanism is arranged on the fan cylinder, and the impeller cleaning mechanism comprises:

[0007] Support seats, a plurality of support seats are arranged in a circumferential distribution on the outer side of the fan cylinder;

[0008] An annular rotating frame, the annular rotating frame is rotatably arranged on the plurality of support seats, a limiting slide rail is arranged on one side of the annular rotating frame close to the fan barrel, a smoothly curved slide groove is arranged in the limiting slide rail, and one end of the limiting slide rail extends in a direction close to the fan barrel;

[0009] The guide frame is installed on the circumferential outer wall of the fan cylinder. A slide rod is slidably inserted into the guide frame. A sealing plate is installed at the bottom of the slide rod. An opening is opened on the fan cylinder. The shape of the sealing plate is adapted to the opening. The position of the top of the slide rod is adapted to the limit slide rail.

[0010] Spring, one end of the spring is installed on the guide frame, and the other end of the spring is connected to the slide bar. Based on the action of the spring, the sealing plate is kept in the opening of the fan cylinder, so that the sealing plate and the fan cylinder cooperate to form a complete cylindrical structure;

[0011] A nozzle is mounted on the slide bar, and the end of the nozzle extends obliquely toward the fan impeller;

[0012] A liquid supply device, which is arranged on the outer wall of the fan cylinder and is used to supply liquid to each nozzle;

[0013] The rotation driving part is arranged on the fan cylinder and is used for driving the annular rotating frame to rotate.

[0014] As a preferred embodiment of the present invention: a roller frame is installed at one end of the slide rod away from the fan cylinder, a roller is rotatably installed on the roller frame, and the roller rolls in the limiting slide rail.

[0015] As a preferred embodiment of the present invention: the rotation driving unit includes:

[0016] An annular gear rack, the annular gear rack is installed on one side outer wall of the annular rotating rack, and the annular gear rack is rotatably installed in the support seat;

[0017] The rotary drive motor is installed on the fan cylinder. The output end of the rotary drive motor is connected to the drive gear, and the drive gear is meshed with the annular gear rack.

[0018] As a preferred embodiment of the present invention: a thermal switch is arranged in the fan barrel, the thermal switch is electrically connected to the impeller cleaning mechanism, and when the thermal switch senses a temperature exceeding a set temperature, it closes to start the impeller cleaning mechanism.

[0019] As a preferred embodiment of the present invention: a delivery pump for delivering water is provided in the liquid supply device, the output end of the delivery pump is connected to a delivery pipe, one end of the delivery pipe is connected to an annular connecting frame, the annular connecting frame is installed on the fan cylinder through a bracket, and the outer wall of one side of the annular connecting frame is connected to each nozzle through a pipeline structure.

[0020] As a preferred embodiment of the present invention: the pipeline structure includes:

[0021] A connecting pipe, one end of which is mounted on one end of the nozzle;

[0022] A connecting hose, one end of which is connected to the other end of the connecting pipe, a plurality of connectors are arranged on the outer wall of one side of the annular connecting frame, and the other end of the connecting hose is connected to the inside of the annular connecting frame through the connector.

[0023] As a preferred embodiment of the present invention: an elastic diaphragm is arranged on the inner side of the end of the nozzle, and a liquid hole is opened on the elastic diaphragm. When the delivery pump is not working, the liquid hole of the elastic diaphragm is in a closed state. When the delivery pump is working, the elastic diaphragm is deformed due to pressure and the liquid hole is in a conductive state.

[0024] As a preferred embodiment of the present invention: a side bracket is installed on the side of the liquid supply device, and a contact switch is installed on the end of the side bracket; a toggle part is installed on the annular rotating frame, and the contact switch is located on the moving path of the toggle part, there are multiple toggle parts and contact switches, and the positions of the toggle parts and the contact switches correspond one to one; when all the contact switches are triggered, the delivery pump works.

[0025] As a preferred embodiment of the present invention: the toggle portion includes:

[0026] A first shifting plate, the first shifting plate is fixed to the outer wall of the annular rotating frame;

[0027] The elastic plate is connected to the top of the first shifting plate, and the top of the elastic plate is connected to the second shifting plate.

[0028] As a preferred embodiment of the present invention: a return water inlet is provided at the bottom of the air outlet side of the fan barrel, and an induced air outlet is provided at the bottom of the air inlet side of the fan, the openings of the return water inlet and the induced air outlet are both facing the inside of the fan barrel, a filter water tank is provided on the outer wall of the fan barrel, a filter screen is provided in the filter water tank, the return water inlet and the induced air outlet are respectively connected to the two sides of the filter screen in the filter water tank through channels, and the channel of the induced air outlet extends to the bottom of the filter water tank.

[0029] The beneficial effects of the present invention are:

[0030] The present invention is provided with an impeller cleaning mechanism, which can, when cleaning is needed, drive the annular rotating frame based on the drive of the rotating drive unit to rotate, thereby driving the limiting slide rail to move; since one end of the limiting slide rail extends in the direction close to the fan barrel, the slide rod can be pressed into the fan barrel, so that the nozzle reaches the fan barrel after passing through the opening; based on the operation of the liquid supply device, water is output to the fan impeller through the nozzle, thereby achieving flushing and cleaning, and the fan air flow rate is not affected when the fan is operating normally.

[0031] The present invention provides a contact switch and a toggle part, so that when the annular rotating frame rotates into place, the contact switch can be triggered based on the squeezing of the contact switch by the toggle part, thereby controlling the operation of the delivery pump; in addition, since a plurality of contact switches are provided, when the plurality of contact switches are triggered, the delivery pump works, thereby improving the reliability of control.

[0032] The present invention can provide the toggle part with a certain deformation ability by arranging the first toggle plate, the elastic plate and the second toggle plate, so that each toggle part can be reliably contacted with the corresponding contact switch when toggled, and accidental collision damage is prevented, thereby improving reliability.

[0033] The present invention can lower the overall temperature of the jet fan by actively closing the thermal switch to start the impeller cleaning mechanism, thereby preventing the internal motor from burning out due to excessive temperature.

[0034] The present invention uses the wind force generated by the rotation of the fan impeller to drive the cleaning water to flow from the bottom of the inner wall of the fan barrel to the air outlet side, enter the return water outlet, and then flow out from the induced air outlet after being filtered by the filter screen of the filter water tank, and then circulate between the bottom of the inner wall of the fan barrel to clean the bottom of the inner wall of the fan barrel, thereby flushing away the dust accumulated on the bottom of the inner wall of the fan barrel. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic diagram of the structure of a jet fan proposed by the present invention;

[0036] Figure 2 This is a structural schematic diagram of an impeller cleaning mechanism of a jet fan proposed by the present invention;

[0037] Figure 3 This is a schematic structural diagram of a side bracket and a contact switch of a jet fan proposed by the present invention;

[0038] Figure 4 This is a schematic diagram of the structure of a jet fan proposed by the present invention, in which an annular rotating frame and an annular gear rack rotate on the inner side of a supporting seat;

[0039] Figure 5 This is a structural schematic diagram of an annular rotating frame and a limiting slide rail of a jet fan proposed by the present invention;

[0040] Figure 6 This is a schematic diagram of the structure of the roller and the limiting slide rail of a jet fan proposed by the present invention;

[0041] Figure 7 The present invention is a schematic cross-sectional structural diagram of the connection between a fan cylinder return water inlet and an induced draft water outlet of a jet fan proposed by the present invention.

[0042] In the figure: 1 fan cylinder, 2 return water inlet, 3 induced air outlet, 4 support seat, 5 annular gear rack, 6 side bracket, 7 liquid supply device, 8 filter water tank, 9 filter screen, 10 fan drive motor, 11 rotation drive motor, 12 contact switch, 13 annular connecting frame, 14 connecting hose, 15 connector, 16 connecting pipe, 17 annular rotating frame, 18 guide frame, 19 sealing plate, 20 fan impeller, 21 limit slide rail, 22 drive gear, 23 roller rack, 24 roller, 25 spring, 26 slide rod, 27 nozzle, 28 first dial plate, 29 elastic plate, 30 second dial plate. DETAILED DESCRIPTION

[0043] The technical solution of the present invention is further described in detail below in conjunction with specific implementation methods.

[0044] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0045] A jet fan, such as Figure 1-7 As shown, it includes a fan cylinder 1, in which a fan impeller 20 is rotatably installed, and a fan drive motor 10 for driving the fan impeller 20 to rotate is arranged in the fan cylinder 1, and two sets of impeller cleaning mechanisms are arranged on the fan cylinder 1, and the two sets of impeller cleaning mechanisms are arranged on the front and rear sides of the fan impeller 20; the impeller cleaning mechanism includes:

[0046] A support seat 4 is installed on the side of the fan cylinder 1, and a plurality of support seats 4 are arranged in a circumferential distribution;

[0047] The annular rotating frame 17 is rotatably mounted on the support seat 4 which is arranged in a circumferential distribution. A plurality of limiting slide rails 21 which are evenly distributed around the circumference are arranged on one side of the annular rotating frame 17 close to the fan cylinder 1. A smoothly curved slide groove is arranged in the limiting slide rail 21, and one end of the limiting slide rail 21 extends in a direction close to the fan cylinder 1.

[0048] The guide frame 18 is installed on the circumferential outer wall of the fan cylinder 1. A slide rod 26 is slidably inserted into the guide frame 18. A sealing plate 19 is installed at the bottom end of the slide rod 26. The fan cylinder 1 is provided with openings distributed in a circumference. The shape of the sealing plate 19 is adapted to the openings. The position of the top end of the slide rod 26 is adapted to the limit slide rail 21.

[0049] Spring 25, one end of the spring 25 is mounted on the guide frame 18, and the other end of the spring 25 is connected to the slide bar 26. Based on the action of the spring 25, the sealing plate 19 is kept in the opening of the fan cylinder 1, so that the sealing plate 19 and the fan cylinder 1 cooperate to form a complete cylindrical structure;

[0050] A nozzle 27, the nozzle 27 is mounted on the slide bar 26, and the end of the nozzle 27 extends obliquely toward the direction of the fan impeller 20;

[0051] A liquid supply device 7, the liquid supply device 7 is installed on the fan cylinder 1, and the liquid supply device 7 is used to supply liquid to each nozzle 27;

[0052] A rotation driving unit, which is mounted on the fan cylinder 1 and is used to drive the annular rotating frame 17 to rotate;

[0053] By setting up the impeller cleaning mechanism, when cleaning is needed, the annular rotating frame 17 can be rotated based on the drive of the rotating drive unit, thereby driving the limiting slide rail 21 to move. Since one end of the limiting slide rail 21 extends in the direction close to the fan barrel 1, the slide rod 26 can be pressed into the fan barrel 1, so that the nozzle 27 reaches the fan barrel 1 after passing through the opening. Based on the operation of the liquid supply device 7, water is output to the fan impeller 20 through the nozzle 27 to achieve flushing and cleaning. When the impeller cleaning mechanism is not cleaning, the sealing plate 19 closes the opening of the side wall of the fan barrel 1, which does not affect the fan air flow rate when the fan is operating normally.

[0054] The two sets of impeller cleaning mechanisms are arranged on the front and rear sides of the fan impeller 20 , so that the front and rear sides of the fan impeller 20 can be fully cleaned.

[0055] like Figure 6 As shown, a roller frame 23 is installed at one end of the slide bar 26 away from the fan cylinder 1, and a roller 24 is rotatably installed on the roller frame 23, and the roller 24 rolls in the limiting slide rail 21;

[0056] By providing structures such as the roller 24, the smoothness of the movement is ensured.

[0057] In order to facilitate the driving of the annular rotating frame 17 to rotate; Figure 2-4 As shown, the rotation driving unit includes:

[0058] The annular gear rack 5 is mounted on an outer wall of one side of the annular rotating frame 17, and the annular gear rack 5 is rotatably mounted in the support seat 4;

[0059] The rotary drive motor 11 is mounted on the fan cylinder 1 , and the output end of the rotary drive motor 11 is transmission-connected with a drive gear 22 , which is meshed with the annular gear rack 5 .

[0060] A thermal switch is installed in the fan barrel 1. The thermal switch is used to sense the air flow temperature in the fan barrel 1. The thermal switch is electrically connected to the impeller cleaning mechanism. When the temperature sensed by the thermal switch exceeds the set temperature, it closes to start the impeller cleaning mechanism. Generally, the impeller cleaning mechanism is regularly and actively operated by the operator to clean the impeller. However, in the event of a fire or high-temperature smoke, the thermal switch actively closes to start the impeller cleaning mechanism, which can reduce the overall temperature of the jet fan and prevent the internal motor from burning due to excessive temperature.

[0061] To facilitate the export of water bodies; Figure 3 , Figure 4 As shown, the liquid supply device 7 is provided with a delivery pump for delivering water, the output end of the delivery pump is connected to a delivery pipe, one end of the delivery pipe is connected to an annular connecting frame 13, the annular connecting frame 13 is installed on the fan cylinder 1 through a bracket, and the outer wall of one side of the annular connecting frame 13 is connected to each nozzle 27 through a pipeline structure.

[0062] In order to facilitate the water delivery, the nozzle 27 is coordinated to move; Figure 4 , Figure 6 As shown, the pipeline structure includes:

[0063] A connecting pipe 16, one end of which is mounted on one end of the nozzle 27;

[0064] A connecting hose 14, one end of which is connected to the other end of a connecting pipe 16, a plurality of connectors 15 are provided on one side of an outer wall of the annular connecting frame 13, and the other end of the connecting hose 14 is connected to the inside of the annular connecting frame 13 through the connector 15;

[0065] By setting up the pipeline structure, the conveying function can be satisfied while utilizing the deformable characteristic of the connecting hose 14 to meet the movement requirements of the nozzle 27, thereby improving reliability.

[0066] like Figure 6 As shown, an elastic diaphragm is provided inside the end of the nozzle 27, and a liquid hole is opened on the elastic diaphragm. When the delivery pump is not working, the liquid hole of the elastic diaphragm is in a closed state. When the delivery pump is working, the elastic diaphragm is deformed due to pressure, and the liquid hole is in a conductive state.

[0067] In order to facilitate the control of the liquid supply device 7; Figure 3 , Figure 4 As shown, a side bracket 6 is installed on the side of the liquid supply device 7, and a contact switch 12 is installed on the end of the side bracket 6; a toggle part is installed on the annular rotating frame 17, and the contact switch 12 is located on the moving path of the toggle part. There are multiple toggle parts and contact switches 12, and the positions of the toggle parts and the contact switches 12 correspond one to one; when all the contact switches 12 are triggered, the delivery pump works;

[0068] By providing the contact switch 12 and the toggle part, when the annular rotating frame 17 is rotated into place, the contact switch 12 can be triggered based on the squeezing of the toggle part on the contact switch 12, thereby controlling the operation of the delivery pump; in addition, since a plurality of contact switches 12 are provided, when a plurality of contact switches 12 are triggered, the delivery pump works, thereby improving the reliability of control.

[0069] like Figure 4 As shown, the toggle portion includes:

[0070] A first shifting plate 28, the first shifting plate 28 is fixed to the outer wall of the annular rotating frame 17;

[0071] An elastic plate 29, the elastic plate 29 is connected to the top of the first shifting plate 28, and the top of the elastic plate 29 is connected to the second shifting plate 30;

[0072] By providing the first dial plate 28, the elastic plate 29 and the second dial plate 30, the toggle part can have a certain deformation ability, so that when toggling, each toggle part can be reliably contacted with the corresponding contact switch 12, and accidental collision damage is prevented, thereby improving reliability.

[0073] like Figure 7 As shown, in order to further clean the fan barrel 1, a return water inlet 2 is provided at the bottom of the air outlet side of the fan barrel 1, and an induced air outlet 3 is provided at the bottom of the air inlet side of the fan, the openings of the return water inlet 2 and the induced air outlet 3 are both facing the inside of the fan barrel 1, and a filtered water tank 8 is provided on the outer wall of the fan barrel 1, and a filter screen 9 is provided in the filtered water tank 8. The return water inlet 2 and the induced air outlet 3 are respectively connected to the two sides of the filter screen 9 in the filtered water tank 8 through channels, and the channel of the induced air outlet 3 extends to the bottom of the filtered water tank 8. This structure is adopted in conjunction with the rotation of the fan impeller 20 and the spraying water of the impeller cleaning mechanism. The wind force generated by the rotation of the fan impeller 20 will cause the cleaning water to flow from the bottom of the inner wall of the fan barrel 1 to the air outlet side, enter the return water outlet 2, and flow out from the induced air outlet 3 after being filtered by the filter screen 9 of the filter water tank 8. Thereafter, the water circulates between the bottom of the inner wall of the fan barrel 1 to clean the bottom of the inner wall of the fan barrel 1, and the dust accumulated at the bottom of the inner wall of the fan barrel 1 is washed away, and the water is finally evaporated.

[0074] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A jet fan, comprising a fan cylinder (1), wherein a fan impeller (20) driven by a fan drive motor (10) is arranged in the fan cylinder (1), characterized in that: The fan cylinder (1) is provided with an impeller cleaning mechanism, the impeller cleaning mechanism comprising: A support seat (4), wherein a plurality of support seats (4) are arranged in a circumferentially distributed manner on the outer side surface of the fan cylinder (1); an annular rotating frame (17), the annular rotating frame (17) being rotatably arranged on the plurality of support seats (4), a limiting slide rail (21) being arranged on a side of the annular rotating frame (17) close to the fan cylinder (1), a smoothly curved slide groove being arranged in the limiting slide rail (21), and one end of the limiting slide rail (21) extending in a direction close to the fan cylinder (1); A guide frame (18), the guide frame (18) being mounted on the circumferential outer wall of the fan cylinder (1), a slide rod (26) being slidably inserted into the guide frame (18), a sealing plate (19) being mounted at the bottom end of the slide rod (26), an opening being formed on the fan cylinder (1), and a shape of the sealing plate (19) being adapted to the opening; and a position of a top end of the slide rod (26) being adapted to a limit slide rail (21); A spring (25), one end of the spring (25) is mounted on the guide frame (18), and the other end of the spring (25) is connected to the slide bar (26). Based on the action of the spring (25), the sealing plate (19) is kept in the opening of the fan cylinder (1), so that the sealing plate (19) and the fan cylinder (1) cooperate to form a complete cylindrical structure; A nozzle (27), the nozzle (27) being mounted on the slide bar (26), and an end of the nozzle (27) extending obliquely toward the direction of the fan impeller (20); A liquid supply device (7), the liquid supply device (7) being arranged on the outer wall of the fan cylinder (1), and the liquid supply device (7) being used to supply liquid to each nozzle (27); A rotation driving unit is arranged on the fan cylinder (1) and is used to drive the annular rotating frame (17) to rotate.

2. A jet fan according to claim 1, characterized in that: A roller frame (23) is installed at one end of the slide rod (26) away from the fan cylinder (1), and a roller (24) is rotatably installed on the roller frame (23), and the roller (24) rolls in the limiting slide rail (21).

3. A jet fan according to claim 1, characterized in that: The rotation driving unit comprises: An annular gear rack (5), the annular gear rack (5) is mounted on an outer wall of one side of the annular rotating rack (17), and the annular gear rack (5) is rotatably mounted in the support seat (4); The rotary drive motor (11) is mounted on the fan cylinder (1), and the output end of the rotary drive motor (11) is drivingly connected to a drive gear (22), and the drive gear (22) is meshed with the annular gear rack (5).

4. A jet blower according to claim 3, characterized in that: A thermal switch is arranged in the fan cylinder (1), the thermal switch is electrically connected to the impeller cleaning mechanism, and when the temperature sensed by the thermal switch exceeds a set temperature, the thermal switch closes to start the impeller cleaning mechanism.

5. A jet blower according to claim 1, characterized in that: The liquid supply device (7) is provided with a delivery pump for delivering water, the output end of the delivery pump is connected to a delivery pipe, one end of the delivery pipe is connected to an annular connecting frame (13), the annular connecting frame (13) is mounted on the fan cylinder (1) via a bracket, and the outer wall of one side of the annular connecting frame (13) is connected to each nozzle (27) via a pipeline structure.

6. A jet fan according to claim 5, characterized in that: The pipeline structure comprises: A connecting pipe (16), one end of the connecting pipe (16) being mounted on one end of the nozzle (27); A connecting hose (14), one end of which is connected to the other end of a connecting pipe (16); a plurality of connectors (15) are provided on an outer wall of one side of the annular connecting frame (13); and the other end of the connecting hose (14) is connected to the inside of the annular connecting frame (13) via the connector (15).

7. A jet fan according to claim 6, characterized in that: An elastic diaphragm is arranged inside the end of the nozzle (27), and a liquid hole is opened on the elastic diaphragm. When the delivery pump is not working, the liquid hole of the elastic diaphragm is in a closed state. When the delivery pump is working, the elastic diaphragm is deformed due to pressure, and the liquid hole is in a conductive state.

8. A jet blower according to claim 1, characterized in that: A side bracket (6) is mounted on the side of the liquid supply device (7), and a contact switch (12) is mounted on the end of the side bracket (6); a toggle portion is mounted on the annular rotating frame (17), and the contact switch (12) is located on the moving path of the toggle portion. There are multiple toggle portions and contact switches (12), and the positions of the toggle portions and the contact switches (12) correspond one to one; when all the contact switches (12) are triggered, the delivery pump operates.

9. A jet blower according to claim 8, characterized in that: The toggle portion comprises: A first shifting plate (28), the first shifting plate (28) being fixed to an outer wall of the annular rotating frame (17); An elastic plate (29), the elastic plate (29) is connected to the top end of the first shifting plate (28), and the top end of the elastic plate (29) is connected to the second shifting plate (30).

10. The jet blower according to claim 1, characterized in that: A return water inlet (2) is provided at the bottom of the air outlet side of the fan cylinder (1), and an induced air outlet (3) is provided at the bottom of the air inlet side of the fan. The openings of the return water inlet (2) and the induced air outlet (3) are both oriented toward the inside of the fan cylinder (1). A filter water box (8) is provided on the outer wall of the fan cylinder (1). A filter screen (9) is provided in the filter water box (8). The return water inlet (2) and the induced air outlet (3) are connected to two sides of the filter screen (9) in the filter water box (8) through channels respectively. The channel of the induced air outlet (3) extends to the bottom of the filter water box (8).

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