A fan filter unit

Abstract

The present invention relates to the technical field of fan units, and discloses a fan-filter unit, comprising: an air duct; an air inlet pipe, an air outlet pipe and a vortex tube arranged in the air duct, the air outlet pipe being arranged in the vortex tube; a turbine arranged in the vortex tube, the turbine rotates to absorb the air in the air inlet pipe into the vortex tube, and blows it out from the air outlet pipe; during backblowing, a connecting component is arranged to connect the return pipe with the rotating turbine, and the position of the return pipe can be restricted, thereby avoiding the problem of poor backblowing cleaning caused by the reaction force when the backflow of wind flows toward the frame and the filter screen, causing the frame and the return pipe to be reset, and after a period of backblowing, the operator can stop the rotation of the turbine, and when the rotation speed of the turbine is reduced to a preset value, the connecting component is arranged to cancel the connection between the turbine and the return pipe, and the return pipe and the frame are gradually reset, and when the turbine is rotated next time, the wind can be normally transported to the air outlet pipe for normal ventilation.

Description

Technical Field

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

[0002] With the decline of environmental quality and the improvement of people's requirements for indoor air quality, fan filter units (FFU) have been widely used in various indoor environments. FFU is a device that integrates a fan and a high-efficiency filter, which can effectively filter out pollutants, bacteria, viruses and particulate matter in the air to provide clean air.

[0003] In the current FFU system, the fan is usually a traditional axial flow fan or a centrifugal fan. However, with the advancement of technology and changes in application requirements, turbo fans, as a new type of fan, are gradually being used in FFU. Turbine fans have the advantages of high efficiency, low noise, small size and stable performance, and can better meet the requirements of modern FFU systems for air volume and air pressure.

[0004] The turbo fan adopts advanced aerodynamic design, which can provide high air volume and high air pressure at low energy consumption, significantly improving the working efficiency of FFU. Compared with traditional fans, the turbo fan generates lower noise during operation, which helps to improve the comfort of the indoor environment. It is particularly suitable for places that require a quiet environment, such as laboratories and operating rooms.

[0005] The current FFU system generally includes an exhaust fan and a fan filter arranged in front of the air inlet of the exhaust fan. When the turbine fan is in the state of suction for a long time, it will attract dust and fine impurities in the air and attach them to the fan filter, so it needs to be cleaned regularly.

[0006] However, the existing cleaning method requires the fan filter to be disassembled for cleaning, which requires manual intervention compared to the exhaust fan back-blowing filter in the prior art, increasing the subsequent maintenance cost. Summary of the invention

[0007] In view of the deficiencies in the prior art, the present invention provides a fan filter unit, aiming to alleviate the above problems at least to a certain extent.

[0008] The above technical objectives of the present invention are achieved through the following technical solutions:

[0009] A fan filter unit, comprising:

[0010] Air duct;

[0011] An air inlet pipe, an air outlet pipe and a vortex pipe are arranged in the air duct, and the air outlet pipe is arranged in the vortex pipe;

[0012] a turbine disposed in the vortex tube, the turbine rotating to draw air in the air inlet pipe into the vortex tube and blowing the air out from the air outlet pipe;

[0013] A plurality of frames are arranged on the outer wall of the air inlet pipe, and a filter screen is arranged on the frame and on one end of the air inlet pipe;

[0014] A return pipe is arranged in the air inlet pipe, a closed pipe is arranged in the return pipe, a plurality of air inlets connected to each other are opened on the return pipe and the closed pipe, and a return channel is formed between the air inlet pipe and the return pipe;

[0015] A moving part provided between the frame and the return pipe, used to move the position of the return pipe when the filter screen is blocked to a preset value, and the moving part can move the position of the return pipe when the frame moves toward the return pipe;

[0016] A reflux component disposed between the reflux pipe and the air outlet pipe, used to close the air outlet pipe when the reflux pipe moves to a preset position, so that the air flow can enter the reflux channel and blow toward the filter screen when the air outlet pipe is closed;

[0017] The connecting component provided between the return pipe and the turbine is used to connect the return pipe to the turbine when the turbine rotates to a preset speed and the return pipe moves to a preset position, so as to limit the position of the return pipe.

[0018] Preferably, the moving part includes a connecting rod rotatably connected to the bottom of the frame, one end of the connecting rod is connected to the return pipe, a positioning frame is connected inside the air inlet pipe, and the closed pipe is connected to the positioning frame.

[0019] Preferably, the reflux component includes a delivery pipe connected to the outer wall of the vortex tube, the delivery pipe is connected to the air inlet pipe, the inner wall of the air inlet pipe is connected to a plurality of limit strips, the air inlet pipe is connected to the air inlet pipe through the limit strips, the outer wall of the reflux pipe is connected to a sliding frame slidably connected to the limit strips, and the sliding frame is connected to a first baffle.

[0020] Preferably, a sealing frame is connected to the air inlet duct.

[0021] Preferably, the reflux component also includes a slide plate slidably connected to the vortex tube, a connecting pipe connecting the vortex tube and the air inlet pipe, a second baffle connected to the slide plate, the second baffle is adapted to one end of the connecting pipe, a screw rod is rotatably connected to the air inlet pipe, and the slide plate is threadedly connected to the screw rod.

[0022] Preferably, the screw rod is connected to a reel, a traction rope is wound on the reel, and one end of the traction rope passes through the vortex tube and is connected to the air inlet pipe and the sliding frame.

[0023] Preferably, a support bar is connected to the limit bar, a first spring is connected between the support bar and the sliding frame, and a second spring is connected between the screw rod and the air outlet pipe.

[0024] Preferably, the connecting component includes a connecting disk connected to the turbine, a connecting rod rotatably connected in the return pipe, a push rod connected to the connecting rod, a limiting convex strip connected to the push rod, a limiting groove matched with the limiting convex strip is provided on one side of the connecting disk, a sliding groove is provided on one side of the limiting groove, a push plate is slidably connected in the sliding groove, and a third spring is connected between the push plate and the sliding groove.

[0025] Preferably, the connecting rod includes a first rod and a second rod slidably connected to the first rod, a fourth spring is connected between the first rod and the second rod, a connecting ring is connected in the reflux pipe, and the first rod is rotatably connected to the connecting ring.

[0026] Preferably, a roller is rotatably connected to the limiting convex strip.

[0027] In summary, the present invention mainly has the following beneficial effects:

[0028] By setting a turbine, the turbine can rotate to absorb air from one end of the air inlet duct and the frame on the outer wall of the air inlet duct when it is used. The air can enter the vortex tube through the filter on the frame, the frame, the air inlet and the filter at one end of the air inlet duct. After passing through the vortex tube, the air enters the air inlet duct to realize the transportation of wind flow. When the air passes through the filter, the dust and debris in the air can be filtered by the set filter. During the filtering, the dust is attracted and attached to the filter. When the filter on the multiple frames on the outer wall of the air inlet duct is blocked by dust to a preset value, the suction force generated by the rotation of the vortex and the resistance generated when the wind passes through the filter can force the frame and the filter to move, and the frame moves toward the central axis of the air inlet duct. The frame moves, and the return pipe can be moved by the moving part when the frame moves. When the return pipe moves to the preset position, the provided connecting component can connect the rotating turbine with the return pipe to limit the position of the return pipe. At the same time, the provided return component can close the outlet pipe. At this time, the wind flow generated by the rotation of the turbine in the vortex pipe can flow back into the return channel. Because the return pipe slides on the closed pipe, the return pipe and the air inlets on the closed pipe are staggered with each other, and the closed pipe can be used to close the outer wall of the return pipe. After the wind flow returns to the return channel, it can be blown to the filter screen on the frame and the filter screen on the air inlet pipe to realize backblowing. The purpose of backblowing and cleaning the filter screen is realized, and automatic The effect of cleaning the filter is that during backblowing, the wind can also blow to the filter at one end of the air inlet pipe. The air inlet and the air outlet belong to two channels, which do not interfere with each other and will not cause turbulence. The backblowing of the wind can be used to better clean the filter. Furthermore, during backblowing, the provided connecting component can connect the return pipe to the rotating turbine, and the position of the return pipe can be restricted, avoiding the problem of poor backblowing cleaning caused by the reaction force caused by the backflow of the wind blowing to the frame and the filter, resulting in the reset of the frame and the return pipe. After a period of backblowing, when the ventilation rate of the filter is restored, the operator can stop the rotation of the turbine and the speed of the turbine. Gradually decrease, when the speed of the turbine is reduced to a preset value, the connecting component cancels the connection between the turbine and the return pipe, and the return pipe and the frame are gradually reset. When the turbine is rotated next time, the wind flow can be normally transported to the outlet pipe for normal ventilation. Compared with traditional turbine fans, there is no need to disassemble and clean the filter screen after it is blocked, which requires manual intervention. Compared with the reverse rotation of the exhaust fan blades, the wind flow is blown in the opposite direction, and there is no need to consider adding a filter screen at the other end to prevent the residual dust in the return gas from affecting the fan blades. The problem that the fan filter screen needs to be disassembled for cleaning in the prior art, which requires manual intervention and increases the subsequent maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 It is a schematic diagram of the air duct structure of the present invention;

[0031] Figure 3 It is a schematic diagram of the structure of the vortex tube of the present invention;

[0032] Figure 4 It is a schematic diagram of the structure of the skateboard of the present invention;

[0033] Figure 5 yes Figure 4 A schematic diagram of the enlarged local structure at point A in the middle;

[0034] Figure 6 It is a schematic diagram of the air inlet pipe structure of the present invention;

[0035] Figure 7 It is a schematic diagram of the structure of the connecting component of the present invention;

[0036] Figure 8 It is a schematic diagram of the connecting rod structure of the present invention;

[0037] Fig. 9 It is a schematic diagram of the reflux pipe and the closed pipe structure of the present invention.

[0038] Reference numerals:

[0039] 100, air duct; 101, air inlet pipe; 102, vortex pipe; 103, turbine; 104, frame; 105, filter; 106, return pipe; 107, closed pipe; 108, air inlet; 109, air outlet pipe;

[0040] 200, connecting rod; 201, positioning frame; 202, conveying pipe; 203, limiting strip; 204, sliding frame; 205, first baffle; 206, sealing frame; 207, sliding plate; 208, connecting pipe; 209, second baffle; 210, screw rod; 211, reel; 212, traction rope; 213, support bar; 214, first spring; 215, second spring;

[0041] 300, connecting plate; 301, connecting rod; 302, pushing rod; 303, limiting convex strip; 304, limiting groove; 305, sliding groove; 306, pushing plate; 307, third spring;

[0042] 400, first rod; 401, second rod; 402, fourth spring; 403, connecting ring; 404, roller. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] refer to Figure 1-Figure 9 , a fan filter unit, comprising:

[0045] Air duct 100;

[0046] An air inlet pipe 101, an air outlet pipe 109 and a vortex tube 102 are arranged in the air duct 100, and the air outlet pipe 109 is arranged in the vortex tube 102;

[0047] The turbine 103 is arranged in the vortex tube 102. The turbine 103 rotates to draw air in the air inlet pipe 101 into the vortex tube 102 and blows it out from the air outlet pipe 109.

[0048] A plurality of frames 104 are arranged on the outer wall of the air inlet pipe 101, and a filter screen 105 is arranged on the frame 104 and at one end of the air inlet pipe 101;

[0049] A return pipe 106 is arranged in the air inlet pipe 101, a closed pipe 107 is arranged in the return pipe 106, a plurality of air inlets 108 are opened on the return pipe 106 and the closed pipe 107, and a return channel is formed between the air inlet pipe 101 and the return pipe 106;

[0050] A moving part disposed between the frame 104 and the return pipe 106, used to move the position of the return pipe 106 when the filter screen 105 is blocked to a preset value, and the moving part can move the position of the return pipe 106 when the frame 104 moves toward the return pipe 106;

[0051] The reflux component disposed between the reflux pipe 106 and the air outlet pipe 109 is used to close the air outlet pipe 109 when the reflux pipe 106 moves to a preset position. When the air outlet pipe 109 is closed, the wind can enter the reflux channel and blow toward the filter 105;

[0052] A connecting component provided between the return pipe 106 and the turbine 103, used to connect the return pipe 106 and the turbine 103 when the turbine 103 rotates to a preset speed and the return pipe 106 moves to a preset position, so as to limit the position of the return pipe 106;

[0053] By setting up the turbine 103, when in use, the turbine 103 rotates to absorb air from one end of the air inlet pipe 101 and the frame 104 on the outer wall of the air inlet pipe 101. The air can enter the vortex tube 102 through the filter 105 on the frame 104, the frame 104, the air inlet 108 and the filter 105 at one end of the air inlet pipe 101. After passing through the vortex tube 102, the air enters the air inlet pipe 101 to realize the transportation of wind flow. When the air passes through the filter 105, the dust and debris in the air can be filtered by the set filter 105. During filtering, the dust is attracted and attached to the filter 105. When the filter 105 on the multiple frames 104 on the outer wall of the air inlet pipe 101 is blocked by dust to a preset value, the suction force generated by the rotation of the vortex, together with the wind passing through the filter The resistance generated by the rotation of the turbine 103 in the vortex tube 102 can force the frame 104 and the filter screen 105 to move, and the frame 104 moves toward the central axis of the air inlet pipe 101. When the frame 104 moves, the return pipe 106 can be moved by the moving part. When the return pipe 106 moves to the preset position, the provided connecting component can connect the rotating turbine 103 with the return pipe 106 to limit the position of the return pipe 106. At the same time, the provided return component can close the air outlet pipe 109. At this time, the wind flow generated by the rotation of the turbine 103 in the vortex tube 102 can flow back into the return channel. Because the return pipe 106 slides on the closed pipe 107, the return pipe 106 and the air inlet 108 on the closed pipe 107 are staggered with each other, and the closed pipe 107 can be used to close the return pipe 109. 06 is sealed, and after the wind flows back into the return flow channel, it can blow toward the filter screen 105 on the frame 104 and the filter screen 105 on the air inlet pipe 101 to achieve backblowing, and the purpose of backblowing and cleaning the filter screen 105 is achieved, and the effect of automatically cleaning the filter screen 105 is achieved. During backblowing, the wind can also blow toward the filter screen 105 at one end of the air inlet pipe 101. The air inlet and the air outlet belong to two channels, which do not interfere with each other and do not produce turbulence. The backblowing of the wind can be used to better clean the filter screen 105. Furthermore, during backblowing, the provided connecting component can connect the return flow pipe 106 with the rotating turbine 103, and the position of the return flow pipe 106 can be restricted, thereby avoiding the backflow of the wind blowing toward the frame and the filter screen 105. The reaction force causes the frame and the return pipe 106 to reset, resulting in the problem of poor backblowing cleaning. After a period of backblowing, the ventilation rate of the filter 105 is restored, and the operator can stop the rotation of the turbine 103. The speed of the turbine 103 gradually decreases. When the speed of the turbine 103 decreases to a preset value, the connecting component cancels the connection between the turbine 103 and the return pipe 106, and the return pipe 106 and the frame 104 gradually reset. When the turbine 103 is rotated next time, the wind flow can be normally transported to the air outlet pipe 109 for normal ventilation. Compared with the traditional turbine 103 fan, it does not require manual intervention to disassemble and clean the filter 105 after it is blocked. Compared with the reverse rotation of the exhaust fan blades, the wind flow is blown in the reverse direction.There is no need to consider adding a filter screen 105 at the other end to prevent the dust in the refluxed gas from affecting the fan blades, which solves the problem in the prior art that the fan filter screen 105 needs to be disassembled for cleaning, which requires manual intervention and increases the subsequent maintenance cost.

[0054] As a further solution of the present invention, the moving part includes a connecting rod 200 rotatably connected to the bottom of the frame 104, one end of the connecting rod 200 is connected to the return pipe 106, a positioning frame 201 is connected inside the air inlet pipe 101, and the closed pipe 107 is connected to the positioning frame 201;

[0055] By setting the connecting rod 200, when the filter 105 on the frame 104 is blocked and the ventilation rate drops to a preset value, the frame 104 will be affected by the suction force and move toward the return pipe 106. When the frame 104 moves, the position of the return pipe 106 can be pressed by the connecting rod 200 to allow the return pipe 106 to slide on the closed pipe 107, thereby achieving the purpose of moving the return pipe 106 when the frame 104 moves. When the return pipe 106 slides on the closed pipe 107, the air inlets 108 on the two are gradually staggered, and the two can be relatively closed to each other to avoid the problem of conflict between the incoming air and the return airflow.

[0056] As a further solution of the present invention, the reflux component includes a delivery pipe 202 connected to the outer wall of the vortex tube 102, the delivery pipe 202 is connected to the air inlet pipe 101, the inner wall of the air inlet pipe 101 is connected to a plurality of limit strips 203, the air inlet pipe 101 passes through the limit strips 203 and is connected to the air inlet pipe 101, the outer wall of the reflux pipe 106 is connected to a sliding frame 204 slidably connected to the limit strips 203, and the sliding frame 204 is connected to a first baffle 205;

[0057] By setting the first baffle 205, in the initial state, the first baffle 205 on the sliding frame 204 can block the delivery pipe 202. When the wind flow generated by the rotation of the turbine 103 enters the delivery pipe 202, the wind flow will not flow back into the return channel. When the filter screen 105 is blocked to a preset value and the frame 104 allows the return pipe 106 to move through the connecting rod 200, the sliding frame 204 and the limit bar 203 can also limit the position of the return pipe 106 to avoid the problem of the return pipe 106 being offset. When the sliding frame 204 follows the return pipe 106, the return pipe 106 is moved. 06 moves to allow the first baffle 205 to leave the limiting strip 203 to open the delivery pipe 202, and at this time the air outlet pipe 109 can be closed. After the wind flow cannot pass through the air outlet pipe 109, the wind flow can enter the return channel through the delivery pipe 202, and the purpose of backblowing the filter 105 can be achieved. When the turbine 103 rotates to intake air, the wind flow can enter the closed pipe 107 through the filter 105 at one end of the air inlet pipe 101, and can be guided by the closed pipe 107 to enter the vortex tube 102, so that the return air flow and the incoming air flow are staggered to avoid turbulence.

[0058] As a further solution of the present invention, a sealing frame 206 is connected to the air inlet pipe 101;

[0059] By setting up the sealing frame 206, after the return pipe 106 and the sliding frame 204 move, the sealing frame 206 can be mounted on the sliding frame 204 to seal the channel between the sliding frame 204 and the return pipe 106, so as to close one end of the return channel to prevent the air in the return channel from being sucked in when the turbine 103 rotates.

[0060] As a further solution of the present invention, the reflux component further includes a slide plate 207 slidably connected to the vortex tube 102, a connecting pipe 208 communicating between the vortex tube 102 and the air inlet pipe 101, a second baffle 209 connected to the slide plate 207, the second baffle 209 is adapted to one end of the connecting pipe 208, a screw rod 210 is rotatably connected to the air inlet pipe 101, and the slide plate 207 is threadedly connected to the screw rod 210;

[0061] By setting the screw rod 210, when the return pipe 106 moves, the position of the screw rod 210 can be rotated. The rotation of the screw rod 210 can move the slide plate 207. The movement of the slide plate 207 can allow the second baffle 209 to close one end of the connecting pipe 208 to prevent the gas from passing through the connecting pipe 208 into the air outlet pipe 109, so as to achieve the purpose of blocking the airflow from entering the air outlet pipe 109 and allowing the airflow to enter the return channel only through the delivery pipe 202.

[0062] As a further solution of the present invention, a reel 211 is connected to the screw rod 210, a traction rope 212 is wound on the reel 211, and one end of the traction rope 212 passes through the vortex tube 102 and is connected to the air inlet pipe 101 and the sliding frame 204;

[0063] By setting up the traction rope 212, the traction rope 212 can be pulled when the return pipe 106 and the sliding frame 204 move. Since the traction rope 212 is wound on the reel 211, the reel 211 and the screw rod 210 can be rotated when the traction rope 212 is pulled, so as to achieve the purpose of allowing the screw rod 210 to rotate to block the airflow from entering the outlet pipe 109 when the return pipe 106 moves.

[0064] As a further solution of the present invention, a support bar 213 is connected to the limit bar 203, a first spring 214 is connected between the support bar 213 and the sliding frame 204, and a second spring 215 is connected between the screw rod 210 and the air outlet pipe 109;

[0065] By providing the first spring 214 and the second spring 215, when the sliding frame 204 is displaced and the screw rod 210 is rotated, the first spring 214 and the second spring 215 can generate potential energy. After the sliding frame 204 and the return pipe 106 are displaced to the preset position, the connecting component connects the return pipe 106 with the turbine 103 and limits the position of the return pipe 106, so that the return pipe 106 and the screw rod 210 can be prevented from resetting due to the action force of the spring and the action force of the gas recoil during the recoil period. After the turbine 103 stops rotating, the rotation speed of the turbine 103 gradually decreases, and the connecting component cancels the connection and limit between the turbine 103 and the return pipe 106. The return pipe 106 can be reset by the force of the first spring 214, and the screw rod 210 can be reversely rotated and reset by the force of the second spring 215. The return pipe 106 is reset to open the air inlet 108, and the screw rod 210 is reset to open the connecting pipe 208. At this time, when the turbine 103 is rotated again, the gas can be normally transported for ventilation.

[0066] As a further solution of the present invention, the connecting component includes a connecting disk 300 connected to the turbine 103, a connecting rod 301 is rotatably connected in the return pipe 106, a push rod 302 is connected to the connecting rod 301, a limiting convex strip 303 is connected to the push rod 302, a limiting groove 304 adapted to the limiting convex strip 303 is opened on one side of the connecting disk 300, a sliding groove 305 is opened on one side of the limiting groove 304, a push plate 306 is slidably connected in the sliding groove 305, and a third spring 307 is connected between the push plate 306 and the sliding groove 305;

[0067] By setting the connecting rod 301, when the return pipe 106 moves, the connecting rod 301 can be driven to move, and the set connecting disk 300 rotates with the turbine 103, and when the connecting rod 301 drives the push rod 302 and the limiting convex strip 303 thereon to move to the preset position, they can contact the connecting disk 300. As the connecting disk 300 rotates, when the limiting groove 304 thereon corresponds to the position of the limiting convex strip 303, the return pipe 106 gives the connecting rod 301 a force to move, which can make the limiting convex strip 303 and the limiting groove 304 fit together and slide in the limiting groove 304. When the limiting convex strip 303 slides to the other side of the connecting disk 300 and when the speed of the turbine 103 reaches the preset value, the connecting disk 300 rotates accordingly, and the setting push rod 302 and the limiting convex strip 303 are connected to the connecting disk 300. The plate 306 slides under the force of the push rod 302 to overcome the force of the third spring 307, and the push rod 302 slides into the sliding groove 305, so that the sliding groove 305 and the limiting convex strip 303 can be used to limit the position of the return pipe 106 through the push rod 302 and the connecting rod 301, so as to prevent the frame from being impacted by the return airflow, which may cause the return pipe 106 to reset. Furthermore, after the filter 105 is recoiled for a period of time, the rotation of the turbine 103 can be stopped, the speed of the turbine 103 gradually decreases, and the third spring 307 gradually releases potential energy, so that the push rod 302 can be pushed out of the sliding groove 305, and the limiting convex strip 303 reaches the limiting groove 304. At this time, the position of the return pipe 106 is no longer restricted and can be reset.

[0068] As a further solution of the present invention, the connecting rod 301 includes a first rod 400 and a second rod 401 slidably connected to the first rod 400, a fourth spring 402 is connected between the first rod 400 and the second rod 401, a connecting ring 403 is connected inside the return pipe 106, and the first rod 400 is rotatably connected to the connecting ring 403;

[0069] By providing the fourth spring 402, the second rod 401 and the push rod 302 can slide on the first rod 400. When the connecting plate 300 rotates, if the positions of the current limiting ridge 303 and the limiting groove 304 do not match, the second rod 401 can slide on the first rod 400 and compress the fourth spring 402, so that the positions of the limiting groove 304 and the limiting ridge 303 correspond to each other, and the position of the connecting rod 301 can be limited in time.

[0070] As a further solution of the present invention, a roller 404 is rotatably connected to the limiting convex strip 303;

[0071] By providing the roller 404 , the friction between the roller 404 and the connecting disk 300 can be reduced, so that the subsequent pushing rod 302 can leave the sliding groove 305 .

[0072] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fan filter unit, characterized in that: include: Air Duct (100); An air inlet pipe (101), an air outlet pipe (109) and a vortex pipe (102) are arranged in the air duct (100), wherein the air outlet pipe (109) is arranged in the vortex pipe (102); a turbine (103) disposed in the vortex tube (102), the turbine (103) rotating to draw air in the air inlet pipe (101) into the vortex tube (102), and blowing the air out from the air outlet pipe (109); A plurality of frames (104) are arranged on the outer wall of the air inlet pipe (101), and a filter screen (105) is arranged on the frame (104) and at one end of the air inlet pipe (101); a return pipe (106) disposed in the air inlet pipe (101), a closed pipe (107) being disposed in the return pipe (106), a plurality of mutually communicating air inlets (108) being provided on the return pipe (106) and the closed pipe (107), and a return channel being formed between the air inlet pipe (101) and the return pipe (106); a moving part provided between the frame (104) and the return pipe (106), used for moving the position of the return pipe (106) when the filter screen (105) is blocked to a preset value, the moving part being capable of moving the position of the return pipe (106) when the frame (104) moves toward the return pipe (106); a return flow component provided between the return pipe (106) and the air outlet pipe (109), used for closing the air outlet pipe (109) when the return pipe (106) moves to a preset position, so that when the air outlet pipe (109) is closed, the wind can enter the return flow channel and blow towards the filter screen (105); a connecting component provided between the return pipe (106) and the turbine (103), used to connect the return pipe (106) and the turbine (103) when the turbine (103) rotates to a preset speed and the return pipe (106) moves to a preset position, so as to limit the position of the return pipe (106); The moving part comprises a connecting rod (200) rotatably connected to the bottom of the frame (104), one end of the connecting rod (200) is connected to the return pipe (106), a positioning frame (201) is connected inside the air inlet pipe (101), and the closed pipe (107) is connected to the positioning frame (201); The return flow component comprises a delivery pipe (202) connected to the outer wall of the vortex tube (102), the delivery pipe (202) being connected to the air inlet pipe (101), the inner wall of the air inlet pipe (101) being connected to a plurality of limit strips (203), the air inlet pipe (101) passing through the limit strips (203) being connected to the air inlet pipe (101), the outer wall of the return flow pipe (106) being connected to a sliding frame (204) slidably connected to the limit strips (203), the sliding frame (204) being connected to a first baffle (205); The return component further comprises a slide plate (207) slidably connected to the vortex tube (102); a connecting tube (208) communicating between the vortex tube (102) and the air inlet tube (101); a second baffle (209) connected to the slide plate (207); the second baffle (209) being adapted to fit one end of the connecting tube (208); a screw rod (210) rotatably connected to the air inlet tube (101); and the slide plate (207) being threadedly connected to the screw rod (210); The screw rod (210) is connected to a reel (211), a traction rope (212) is wound around the reel (211), and one end of the traction rope (212) passes through the vortex tube (102) and is connected to the air inlet pipe (101) and the sliding frame (204); A support bar (213) is connected to the limit bar (203), a first spring (214) is connected between the support bar (213) and the sliding frame (204), and a second spring (215) is connected between the screw rod (210) and the air outlet pipe (109); The connecting component comprises a connecting disk (300) connected to the turbine (103); a connecting rod (301) is rotatably connected in the return pipe (106); a push rod (302) is connected to the connecting rod (301); a limiting convex strip (303) is connected to the push rod (302); a limiting groove (304) adapted to the limiting convex strip (303) is provided on one side of the connecting disk (300); a sliding groove (305) is provided on one side of the limiting groove (304); a push plate (306) is slidably connected in the sliding groove (305); and a third spring (307) is connected between the push plate (306) and the sliding groove (305); The connecting rod (301) comprises a first rod (400) and a second rod (401) slidably connected to the first rod (400); a fourth spring (402) is connected between the first rod (400) and the second rod (401); a connecting ring (403) is connected inside the return pipe (106); and the first rod (400) is rotatably connected to the connecting ring (403).

2. A fan filter unit according to claim 1, characterized in that: A sealing frame (206) is connected inside the air inlet pipe (101).

3. A fan filter unit according to claim 1, characterized in that: A roller (404) is rotatably connected to the limiting convex strip (303).

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