Oil smoke exhaust device with filter screen self-cleaning function

Abstract

The invention relates to a cooking fume exhaust device with a filter screen self-cleaning function, and relates to the technical field of filter screen cleaning, the cooking fume exhaust device comprises an inlet mechanism, symmetrical supporting frames are arranged at the two ends in the inlet mechanism, and a driving mechanism is arranged at the top of the outer wall of the inlet mechanism in a penetrating mode; ring teeth are arranged on the inner wall of the inlet mechanism and located on the sides, away from each other, of the supporting frames, cleaning mechanisms are arranged on the sides, away from each other, of the supporting frames in a penetrating mode, and filter screen mechanisms are arranged in the surrounding portions of the cleaning mechanisms. The filter screen in the filter screen mechanism can effectively intercept impurities and particles in fluid, it is guaranteed that the fluid passing through the device reaches the high cleanliness, the requirements for the fluid purity in different application scenes are met, dirt on the filter screen is easier to loosen and fall off due to the micro-vibration property of a filter screen support, and the filter screen is more convenient to use. The long-term adhesion of dirt on the filter screen is reduced, so that the continuous and stable filtering performance of the filter screen is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of filter cleaning, in particular to an oil fume exhaust device with filter self-cleaning function. BACKGROUND

[0002] In the working of a steam turbine generator, in order to ensure the normal working of the steam turbine, the oil fume exhaust system of the main oil tank of the steam turbine is essential. In order to improve the exhaust effect of the main oil tank, people usually install an oil fume exhaust device on the gas outlet of the main oil tank for exhaust.

[0003] For the above-mentioned related technology, the inventor believes that in the working of the existing steam turbine generator, the oil fume exhaust device is internally provided with a filter device. After a long period of use, oil fume accumulates in the filter device, which leads to a decrease in the filtering function, thereby causing the accumulation of oil fume in the oil fume exhaust pipeline to be blocked. The whole machine needs to be stopped for maintenance, replacement and cleaning of the filter screen in the filter device, which wastes manpower and resources. SUMMARY

[0004] In order to solve the problem of the decrease in the filtering function due to the accumulation of oil fume in the filter device after a long period of use, thereby causing the accumulation of oil fume in the oil fume exhaust pipeline to be blocked, the present application provides an oil fume exhaust device with filter self-cleaning function.

[0005] An oil fume exhaust device with filter self-cleaning function comprises an inlet mechanism, both ends of the inlet mechanism are provided with mutually symmetrical support frames, a driving mechanism is provided through the top of the outer wall of the inlet mechanism, ring teeth are provided on the inner wall of the inlet mechanism on the side away from each other of the support frames, a cleaning mechanism is provided through the side away from each other of the support frames, and a filter screen mechanism is provided around the inside of the cleaning mechanism.

[0006] Preferably, the oil fume exhaust device with filter self-cleaning function in the generator oil fume exhaust device is based on the inlet mechanism. By setting the symmetrical support frames, the driving mechanism on the top of the outer wall, the ring teeth on the inner wall, the cleaning mechanism through the support frames and the filter screen mechanism around the inside of the cleaning mechanism, and by reasonably arranging the positions of the components, the driving mechanism drives the cleaning mechanism to automatically clean the filter screen mechanism under the action of the ring teeth, thereby ensuring the high filtering performance of the filter screen of the oil fume exhaust device.

[0007] Further, the output end of the driving mechanism extends into the inlet mechanism, and the driving mechanism is located between the symmetrical support frames. The cleaning mechanism is located around the inside of the ring teeth, and the end of the filter screen mechanism away from the cleaning mechanism is fixed to the inner wall of the inlet mechanism.

[0008] Preferably, the core component of the inlet mechanism is an inlet tee pipe, which has two output ports at its parallel ends and an input port at its vertical end, and the input port and the output ports are in communication with each other, forming a complete fluid transmission path to ensure smooth flow of fluid in the device.

[0009] Further, the inlet mechanism comprises an inlet tee pipe, which is a tee pipe, and the inlet tee pipe has output ports at its parallel ends and an input port at its vertical end, and the input port and the output ports are in communication with each other.

[0010] Preferably, the input port and the output port are not independent of each other, but are in communication with each other through the channel inside the inlet tee pipe. This communication design allows fluid to enter from the input port, be reasonably distributed and guided inside the inlet tee pipe, and then flow out from the two output ports, forming a complete and efficient fluid transmission system that provides a solid guarantee for the normal operation of the entire device.

[0011] Further, the driving mechanism comprises a driving motor, and the bottom output end of the driving motor is provided with a first linkage rod, the first linkage rod penetrates the inlet tee pipe, and the bottom of the first linkage rod is provided with a first linkage bevel gear.

[0012] Preferably, the driving mechanism uses a driving motor as a power source, and the bottom output end of the driving motor is provided with a first linkage rod, which penetrates the inlet tee pipe and extends into the pipe, and the bottom is provided with a first linkage bevel gear, both of which are located in the inlet tee pipe and opposite to the output ports, to realize power transmission and direction conversion and ensure stable operation of the device.

[0013] Further, the first linkage rod penetrates the top of the inlet mechanism and extends into the inlet tee pipe, and the first linkage rod and the first linkage bevel gear are both located in the inlet tee pipe and opposite to the output ports.

[0014] Preferably, when the first linkage rod extends to the bottom, the first linkage bevel gear is installed. The first linkage bevel gear, as a special gear structure, can realize power direction conversion and transmission with its unique conical design, and plays a key role in mechanical transmission.

[0015] Further, the cleaning mechanism comprises a second linkage rod, one end of the second linkage rod is provided with a second bevel gear, the outer wall of the second linkage rod is provided with a revolution frame at a position parallel to the ring gear, the end of the revolution frame away from the second linkage rod is provided with a revolution gear, the outer wall of the end of the second linkage rod away from the second bevel gear is provided with a vibrating eccentric block, the side of the end of the revolution frame close to the vibrating eccentric block is provided with a revolution shaft, the outer wall of the revolution shaft is provided with uniformly distributed rotary scrapers, the outer wall of the second linkage rod between the revolution frame and the vibrating eccentric block is provided with uniformly distributed nozzles, the nozzles are provided with elastic membranes, the elastic membranes are provided with cross grooves, and the second bevel gear is supported by a support frame and is in mesh with the first linkage bevel gear.

[0016] Preferably, the cleaning mechanism takes the second linkage rod as the core, one end of the second linkage rod is in mesh with the first linkage bevel gear of the driving mechanism through the second bevel gear, the outer wall of the second linkage rod is provided with a revolution frame, the revolution gear at the end of the revolution frame revolves in the ring gear, the other end of the second linkage rod is provided with a vibrating eccentric block to cause vibration, the end of the revolution frame is provided with a revolution shaft connected with the revolution gear and rotary scrapers, and the outer wall of the linkage rod is provided with nozzles with elastic membranes and cross grooves, and the linkage rod is hollow and can be connected with a water delivery pipe, so that the filter screen can be cleaned in multiple modes.

[0017] Further, the revolution gear is three in a group, and the two groups of revolution gears are in the ring gear, and the revolution gears are in mesh with the inner wall of the ring gear, the revolution shaft is in connection with the revolution gear through the revolution frame, the second linkage rod is hollow and can be connected with a water delivery pipe, and the rotary scrapers are connected with the revolution shaft through torsional springs.

[0018] Preferably, the second linkage rod is hollow, which can be connected with a water delivery pipe. Through the water delivery pipe, the cleaning water can be delivered to the inside of the second linkage rod and then sprayed out of the nozzles, so that the filter screen can be cleaned in a full-range mode combining water washing and mechanical cleaning.

[0019] Further, the filter screen mechanism comprises a filter screen support, one side of the filter screen support close to the revolution frame is provided with a filter screen, and the outer wall of the filter screen is provided with a filter screen inner support, the revolution shaft rotates around the outer wall of the filter screen inner support, the revolution shaft drives the rotary scrapers to slide between the outer wall of the filter screen inner support and the inner wall of the inlet three-way pipe, and the filter screen support has a micro-vibration property.

[0020] Preferably, the filter screen mechanism takes the filter screen support as the support, and the side of the filter screen support close to the revolution frame is provided with a filter screen and a filter screen inner support. During cleaning, the revolution shaft rotates around the filter screen inner support, drives the rotary scrapers to slide between the outer wall of the filter screen inner support and the inner wall of the inlet three-way pipe, and the filter screen support has a micro-vibration property, which can assist in improving the cleaning effect and the service life of the filter screen.

[0021] Compared with the prior art, the present application has the advantages of: 1: The filter screen in the filter screen mechanism can effectively intercept impurities and particles in the fluid, ensuring that the fluid passing through the device achieves high cleanliness, meeting the requirements of different application scenarios for fluid purity. The micro-vibration property of the filter screen support makes the dirt on the filter screen more easily loose and fall off, reducing the long-term attachment of dirt on the filter screen, thereby ensuring the sustained stability of the filter screen filtering performance and avoiding the problem of reduced filtering efficiency caused by filter screen blockage.

[0022] 2: The design of the cleaning mechanism realizes all-around cleaning of the filter screen. The second linkage rod drives the revolving frame to revolve, and the revolving teeth revolve under the action of the ring teeth, thereby causing the rotating scraper to slide between the outer wall of the filter screen inner support and the inner wall of the inlet tee pipe, which can cover all parts of the filter screen, effectively scraping off the dirt attached to the surface and gaps of the filter screen. The vibration generated by the vibration eccentric block enhances the cleaning effect, making the dirt more easily fall off the filter screen. The water sprayed by the nozzle can wash the filter screen, combined with the mechanical cleaning of the rotating scraper, forming a all-around cleaning mode of water washing and mechanical cleaning cooperation, greatly improving the thoroughness of cleaning. The design of the elastic coating and the cross slot enables the nozzle to tightly close when not spraying water, preventing dust and impurities from entering. When water is needed, the water pressure can open the cross slot for precise water spraying, avoiding water waste and ensuring the accuracy of cleaning.

[0023] In summary, the present application effectively intercepts impurities through the filter screen, ensures fluid cleanliness, reduces dirt attachment through the micro-vibration property of the support, maintains stable filtering performance, combines revolution and revolution to clean the filter screen all-around with the rotating scraper, cooperates with the vibration eccentric block and the nozzle water washing, and precisely controls water with the elastic coating to improve the cleaning effect BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a schematic diagram of the overall structure of the present application; Figure 2 is a schematic diagram of the driving mechanism structure of the present application; Figure 3 is a schematic diagram of the support frame structure of the present application; Figure 4 is a schematic diagram of the Figure 3 is an enlarged structure schematic diagram of position A in the present application; Figure 5 is a schematic diagram of the cleaning mechanism structure of the present application; Figure 6 is a schematic diagram of the filter screen mechanism structure of the present application; Figure 7 is a schematic diagram of the nozzle structure of the present application.

[0025] Explanation of reference signs: 1, inlet mechanism; 101, inlet tee; 102, input port; 103, output port; 2, driving mechanism; 201, driving motor; 202, first linkage rod; 203, first linkage bevel gear; 3, support frame; 4, ring tooth; 5, filter screen mechanism; 501, filter screen support; 502, filter screen inner support; 503, filter screen; 6, cleaning mechanism; 601, second linkage rod; 602, second bevel gear; 603, revolving frame; 604, rotating tooth; 605, rotating scraper; 606, rotating rod; 607, nozzle; 608, vibrating eccentric block; 609, elastic film; 610, cross slot. DETAILED DESCRIPTION

[0026] Example 1

[0027] Reference Figures 1-7 An oil fume exhaust device with filter screen self-cleaning function, comprising an inlet mechanism 1, both ends of the inlet mechanism 1 are provided with mutually symmetrical support frames 3, and a driving mechanism 2 is provided through the top of the outer wall of the inlet mechanism 1. At both ends inside the inlet mechanism 1, mutually symmetrical support frames 3 are respectively arranged, which play an important role in stabilizing and supporting other components. The driving mechanism 2 is provided through the top of the outer wall of the inlet mechanism 1, and serves as the power source of the entire device, providing power support for subsequent cleaning actions. The inner wall of the inlet mechanism 1 is provided with ring teeth 4 on the side away from the support frames 3, and the side away from the support frames 3 is provided with a cleaning mechanism 6. The cleaning mechanism 6 is provided with a filter screen mechanism 5 around the inside, the output end of the driving mechanism 2 extends into the inlet mechanism 1, and the driving mechanism 2 is located between the symmetrical support frames 3. The cleaning mechanism 6 is located inside the ring teeth 4, and the end of the filter screen mechanism 5 away from the cleaning mechanism 6 is fixed to the inner wall of the inlet mechanism 1. The side away from the support frames 3 is provided with a cleaning mechanism 6, and the cleaning mechanism 6 is provided with a filter screen mechanism 5 inside. The filter screen mechanism 5 is used to filter the incoming oil fume, intercepting impurities and particulate matter in the oil fume. The cleaning mechanism 6 is responsible for cleaning the filter screen mechanism 5, ensuring that the filter screen mechanism 5 always maintains good filtering performance. The output end of the driving mechanism 2 extends into the inlet mechanism 1 and is located between the symmetrical support frames 3, which ensures that the driving mechanism 2 can effectively transmit power to the cleaning mechanism 6. At the same time, the cleaning mechanism 6 is located within the range of the ring teeth 4, so that the cleaning mechanism 6 can move in a specific way under the action of the ring teeth 4 to achieve comprehensive cleaning of the filter screen mechanism 5. The end of the filter screen mechanism 5 away from the cleaning mechanism 6 is fixed to the inner wall of the inlet mechanism 1, ensuring the stability of the filter screen mechanism 5 during operation.

[0028] The inlet mechanism 1 comprises an inlet tee pipe 101, which is a tee pipe, both ends of the inlet tee pipe 101 are provided with output ports 103 in parallel, and the vertical end of the inlet tee pipe 101 is provided with an input port 102, and the input port 102 and the output port 103 are in communication with each other. The vertical end of the inlet tee pipe 101 is provided with the input port 102. The input port 102 is the starting channel of the fluid entering device, and its design and installation are also crucial. It needs to ensure that it can smoothly receive fluid from the outside, and cooperate closely with the internal structure to ensure that the fluid can enter the inlet tee pipe 101 accurately. The input port 102 and the output port 103 are not independent of each other, but are in communication with each other through the channel inside the inlet tee pipe 101. This communication design allows fluid to enter from the input port 102, be reasonably distributed and guided inside the inlet tee pipe 101, and then flow out from the two output ports 103, forming a complete and efficient fluid transmission system, which provides a solid guarantee for the normal operation of the entire device.

[0029] Embodiment 2

[0030] The driving mechanism 2 comprises a driving motor 201, and a first linkage rod 202 is arranged on the bottom output end of the driving motor 201. The first linkage rod 202 penetrates the inlet tee pipe 101, and a first linkage bevel gear 203 is arranged at the bottom of the first linkage rod 202. The first linkage rod 202 extends to the inside of the inlet tee pipe 101 through the top of the inlet mechanism 1, and the first linkage rod 202 and the first linkage bevel gear 203 are located in the inlet tee pipe 101 and between the output ports 103. The bottom output end of the driving motor 201 is carefully provided with the first linkage rod 202. The design of the first linkage rod 202 is very elaborate. It not only needs to have enough strength to transmit the power of the driving motor 201, but also needs to ensure stability and precision during operation. The first linkage rod 202 penetrates the inlet tee pipe 101 in a penetrating manner. This penetrating design allows power to be smoothly transmitted from the driving motor 201 to the relevant components inside the inlet tee pipe 101. When the first linkage rod 202 extends to the bottom, the first linkage bevel gear 203 is installed. The first linkage bevel gear 203 is a special gear structure, and its unique conical design can realize the conversion and transmission of power. The first linkage rod 202 penetrates from the top of the inlet mechanism 1 and extends to the inside of the inlet tee pipe 101. Moreover, the first linkage rod 202 and the first linkage bevel gear 203 arranged at the bottom thereof are accurately located in the inlet tee pipe 101, and the specific position is between the output ports 103. Such a layout design not only ensures the efficiency of power transmission, so that the first linkage bevel gear 203 can be well meshed and transmitted with other corresponding components, but also fully utilizes the space inside the inlet tee pipe 101.

[0031] The cleaning mechanism 6 comprises a second linkage rod 601, the second linkage rod 601 is provided with a second bevel gear 602 at one end close to the first linkage bevel gear 203, the outer wall of the second linkage rod 601 is provided with a revolute frame 603 at a position parallel to the ring teeth 4, the end of the revolute frame 603 away from the second linkage rod 601 is provided with a self-rotating tooth 604, the outer wall of the end of the second linkage rod 601 away from the second bevel gear 602 is provided with a vibrating eccentric block 608, the end of the revolute frame 603 close to the vibrating eccentric block 608 is provided with a self-rotating rod 606, the outer wall of the self-rotating rod 606 is provided with uniformly distributed rotating scrapers 605, the outer wall of the second linkage rod 601 between the revolute frame 603 and the vibrating eccentric block 608 is provided with uniformly distributed nozzles 607, the nozzles 607 are provided with elastic films 609, the elastic films 609 are provided with cross grooves 610, the second bevel gear 602 penetrates through the support frame 3 and is meshed with the first linkage bevel gear 203, the self-rotating tooth 604 is in a group of three, and two groups of self-rotating teeth 604 are in the ring teeth 4, the self-rotating tooth 604 is meshed with the inner wall of the ring teeth 4, the self-rotating rod 606 penetrates through the revolute frame 603 and is connected with the self-rotating tooth 604, the second linkage rod 601 is a hollow structure and can be rotatably sleeved with a water pipe, the rotating scraper 605 is connected with the self-rotating rod 606 through a torsion spring, the cleaning mechanism 6 takes the second linkage rod 601 as the core, one end is meshed with the first linkage bevel gear 203 of the driving mechanism through the second bevel gear 602 to transmit force, the outer wall is provided with the revolute frame 603, the end self-rotating tooth 604 of the revolute frame 603 revolves in the ring teeth 4, the other end is provided with the vibrating eccentric block 608 to cause vibration, the end of the revolute frame 603 is provided with the self-rotating rod 606 connected with the self-rotating tooth 604 and the rotating scraper 605, the outer wall of the linkage rod is provided with the nozzle 607 with the elastic film 609 and the cross groove 610, and the linkage rod is hollow and can be sleeved with a water pipe, so as to realize multi-mode filter screen cleaning.

[0032] The outer wall of the second linkage rod 601 is uniformly provided with the revolute frame 603 at a position parallel to the ring teeth 4. The revolute frame 603 is like a mechanical arm, which provides a stable support structure for subsequent cleaning actions. The self-rotating tooth 604 is arranged in the end of the revolute frame 603 away from the second linkage rod 601. The self-rotating tooth 604 is in a group of three, and there are two groups, and the two groups of self-rotating teeth 604 are in the interior of the ring teeth 4 and are meshed with the inner wall of the ring teeth 4. This design makes the self-rotating tooth 604 rotate under the action of the ring teeth 4 when the second linkage rod 601 drives the revolute frame 603 to revolve, so as to realize more complex and efficient cleaning actions.

[0033] The core component of the cleaning mechanism 6 is the second linkage rod 601. At one end of the second linkage rod 601 close to the first linkage bevel gear 203, a second bevel gear 602 is carefully arranged. Through precise matching design, the two bevel gears realize power transmission and direction conversion. Specifically, the second bevel gear 602 penetrates the support frame 3 and is meshed with the first linkage bevel gear 203. When the first linkage bevel gear 203 rotates under the action of the driving mechanism, it can drive the second bevel gear 602 to rotate, thereby making the second linkage rod 601 start to operate. At the bottom of the outer wall of the end of the second linkage rod 601 away from the second bevel gear 602, a vibrating eccentric block 608 is arranged. The vibrating eccentric block 608 will produce unbalanced centrifugal force during rotation, thereby causing the vibration of the second linkage rod 601. This vibration can enhance the cleaning effect of the cleaning mechanism 6 on the filter screen, making the dirt attached to the filter screen more easily fall off.

[0034] At the end of the public transfer frame 603 close to the vibrating eccentric block 608, a self-rotating rod 606 is arranged. The self-rotating rod 606 is connected with the self-rotating tooth 604 by penetrating the public transfer frame 603. When the self-rotating tooth 604 rotates, it will drive the self-rotating rod 606 to rotate together. On the outer wall of the self-rotating rod 606, rotating scrapers 605 are uniformly distributed. The rotating scrapers 605 are connected with the self-rotating rod 606 through torsional springs. This connection mode makes the rotating scrapers 605 have a certain elasticity during rotation, which can better adapt to the surface shape of the filter screen and improve the completeness of cleaning. On the outer wall of the second linkage rod 601 between the public transfer frame 603 and the vibrating eccentric block 608, spray nozzles 607 are uniformly arranged. The spray nozzles 607 are provided with elastic cover films 609, and cross grooves 610 are arranged on the elastic cover films 609. This design makes the elastic cover films 609 tightly close when water is not needed to be sprayed, preventing dust and impurities from entering the spray nozzles 607; when the filter screen needs to be cleaned by spraying water, the water pressure can open the cross grooves 610, so that water is sprayed out of the spray nozzles 607 to wash the filter screen.

[0035] The filter screen mechanism 5 includes filter screen supports 501, and each filter screen support 501 is provided with a filter screen 503 close to the public transfer frame 603. The outer wall of each filter screen 503 is provided with a filter screen inner support 502, the self-rotating rod 606 rotates around the outer wall of the filter screen inner support 502, and the self-rotating rod 606 drives the rotating scraper 605 to slide between the outer wall of the filter screen inner support 502 and the inner wall of the inlet three-way pipe 101. The filter screen support 501 has a micro-vibration property, and the filter screen mechanism 5 is supported by the filter screen support 501, which is provided with the filter screen 503 and the filter screen inner support 502 close to the public transfer frame 603. During cleaning, the self-rotating rod 606 rotates around the filter screen inner support 502, driving the rotating scraper 605 to slide between the outer wall of the filter screen inner support 502 and the inner wall of the inlet three-way pipe 101 for cleaning. In addition, the filter screen support 501 has a micro-vibration property, which can assist in improving the cleaning effect and the service life of the filter screen.

[0036] The above are all preferred embodiments of the present application, and do not limit the protection scope of the present application, so that: all equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A fume extraction device with a self-cleaning filter function, characterized in that: Including the entrance mechanism (1), the support frame (3) is symmetrically arranged in the entrance mechanism (1), the drive mechanism (2) is arranged on the top of the outer wall of the entrance mechanism (1), the ring tooth (4) is arranged on the inner wall of the entrance mechanism (1), the cleaning mechanism (6) is arranged on the side of the support frame (3) away from each other, and the filter screen mechanism (5) is arranged in the cleaning mechanism (6).

2. The cooking fume exhaust device with filter screen self-cleaning function according to claim 1, characterized in that: The output end of the drive mechanism (2) extends into the entrance mechanism (1), the cleaning mechanism (6) is located in the ring tooth (4), and the filter screen mechanism (5) is fixed to the inner wall of the entrance mechanism (1).

3. The cooking fume exhaust device with filter screen self-cleaning function according to claim 1, characterized in that: The entrance mechanism (1) includes an entrance tee (101), the entrance tee (101) is a tee, the parallel ends of the entrance tee (101) are provided with output ports (103), and the vertical end of the entrance tee (101) is provided with an input port (102).

4. The cooking fume exhaust device with filter screen self-cleaning function according to claim 1, characterized in that: The drive mechanism (2) includes a drive motor (201), the first linkage rod (202) is arranged on the bottom output end of the drive motor (201), the first linkage rod (202) penetrates the entrance tee (101), and the first linkage cone gear (203) is arranged on the bottom of the first linkage rod (202).

5. The cooking fume exhaust device with filter screen self-cleaning function according to claim 1, characterized in that: The first linkage rod (202) penetrates the top of the entrance mechanism (1) and extends into the entrance tee (101), and the first linkage rod (202) and the first linkage cone gear (203) are located in the entrance tee (101) and located between the output ports (103).

6. The cooking fume exhaust device with filter screen self-cleaning function according to claim 1, characterized in that: The cleaning mechanism (6) includes a second linkage rod (601), the second end of the second linkage rod (601) is provided with a second cone gear (602), the outer wall of the second linkage rod (601) is provided with a revolution frame (603) at a position parallel to the ring tooth (4), the end of the revolution frame (603) away from the second linkage rod (601) is provided with a rotation tooth (604), the outer wall of the end of the second linkage rod (601) away from the second cone gear (602) is provided with a vibrating eccentric block (608), the end of the revolution frame (603) close to the vibrating eccentric block (608) is provided with a rotation rod (606), the outer wall of the rotation rod (606) is provided with uniformly distributed rotation scrapers (605), the outer wall of the second linkage rod (601) between the revolution frame (603) and the vibrating eccentric block (608) is provided with uniformly distributed nozzles (607), the nozzles (607) are provided with elastic films (609), the elastic films (609) are provided with cross grooves (610), and the second cone gear (602) penetrates the support frame (3) and is meshed with the first linkage cone gear (203).

7. The cooking fume exhaust device with filter screen self-cleaning function according to claim 1, characterized in that: The self-rotation tooth (604) is three in a group, and two groups of self-rotation tooth (604) are in the ring tooth (4), the self-rotation tooth (604) and the inner wall of ring tooth (4) are engaged with each other, the self-rotation rod (606) is connected with the self-rotation tooth (604) through the rotation frame (603), the second linkage rod (601) is hollow structure and can rotate the water pipe, the rotating scraper (605) is connected with the self-rotation rod (606) through the torsion spring.

8. The cooking fume exhaust device with filter screen self-cleaning function according to claim 1, characterized in that: The filter screen mechanism (5) includes a filter screen support (501), the filter screen support (501) is provided with a filter screen (503) on one side of the rotation frame (603), the outer wall of the filter screen (503) is provided with a filter screen inner support (502), the self-rotation rod (606) rotates around the outer wall of the filter screen inner support (502), and the self-rotation rod (606) drives the rotating scraper (605) to slide between the outer wall of the filter screen inner support (502) and the inner wall of the inlet tee pipe (101), the filter screen support (501) has a micro-vibration attribute.

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