CN118728770A - A self-cleaning double-suction centrifugal fan - Google Patents

Abstract

The invention discloses a self-cleaning double-suction centrifugal fan, and relates to the technical field of centrifugal fans. The invention comprises a fan volute, a cleaning assembly and an auxiliary assembly, when a filter screen needs to be cleaned, the lifting sealing plate moves to enable an air inlet on one side of the fan volute to be closed, the cleaning scraping plate is driven to rotate by rotation of the first rotating toothed ring, the filter screen close to the first rotating toothed ring is cleaned by the cleaning scraping plate, at the moment, the air inlet close to the second rotating toothed ring is still in an open state, after the cleaning is completed, the lifting sealing plate moves to enable the air inlet to be in an open state, the upper sealing plate and the lower sealing plate move to enable the air inlet on the other side of the fan volute to be closed, the cleaning scraping plate is driven to rotate by periodic rotation of the second rotating toothed ring, the filter screen close to the second rotating toothed ring is cleaned by the cleaning scraping plate, the centrifugal motor is cleaned under the condition of no shutdown, repeated start and stop of the cleaning fan under severe environment is avoided, the service life of the fan is prolonged, and the working efficiency is improved.

Description

A self-cleaning double-suction centrifugal fan

Technical Field

The present invention belongs to the technical field of centrifugal fans, and in particular, relates to a self-cleaning double-suction centrifugal fan.

Background Art

A centrifugal fan is a machine that relies on input mechanical energy to increase gas pressure and deliver gas. Based on the principle of converting kinetic energy into potential energy, a centrifugal fan uses a high-speed rotating impeller to accelerate the gas, then decelerate and change the flow direction, so that kinetic energy is converted into potential energy.

Existing centrifugal fans are usually equipped with a filter at the air inlet to prevent impurities in the gas from entering the fan. However, when cleaning the filter, it is necessary to stop the machine for manual cleaning. For example, Chinese patent application CN116591970A lacks a cleaning device for the filter. When a large amount of impurities are attached to the air inlet, the machine must be stopped for cleaning to prevent excessive impurities from affecting the working efficiency of the fan. When the centrifugal fan discharges gas with excessive dust and impurities, the impurities are easily attached to the air inlet, and frequent shutdowns are required for cleaning. Repeated starting and stopping of the fan for cleaning will reduce the service life of the fan and reduce working efficiency. When scraping and cleaning the filter, some impurities will move into the filter holes of the filter. If it is not cleaned, the filter holes will be blocked over time, affecting air intake and reducing the working efficiency of the fan.

Summary of the invention

In response to the problems in the related technology, the present invention proposes a self-cleaning double-suction centrifugal fan, which has the function of cleaning the centrifugal motor without stopping the machine, avoiding repeated starting and stopping of the fan for cleaning in harsh environments, thereby increasing the service life of the fan and improving the working efficiency. The gas passes through the filter and blows out the dust and impurities in the filter holes of the filter, preventing the dust and impurities from clogging the filter holes and reducing the working efficiency of the centrifugal fan. It solves the technical problem that when the centrifugal fan discharges gas with excessive dust and impurities, the impurities are easily attached to the air inlet, requiring frequent shutdown for cleaning, and repeated starting and stopping of the fan for cleaning will reduce the service life of the fan and reduce the working efficiency; when the filter is scraped and cleaned, some impurities will move into the filter holes of the filter. If they are not cleaned, they will clog the filter holes over time, affecting the air intake and reducing the working efficiency of the fan.

In order to solve the above technical problems, the present invention provides the following technical solutions: The present invention is a self-cleaning double-suction centrifugal fan, comprising a fan volute, a cleaning component and an auxiliary component, wherein air inlets are provided on both sides of the fan volute, and the cleaning component is provided at the air inlet;

The cleaning assembly comprises a cleaning unit, a lifting sealing plate, an upper sealing plate, a lower sealing plate, a first rotating gear ring and a second rotating gear ring;

The cleaning unit is arranged on both sides of the fan volute, and the cleaning unit comprises a filter screen and a cleaning scraper, the filter screen is arranged at the air inlet, and the cleaning scraper is arranged on a side of the filter screen away from the fan volute;

The lifting sealing plate is arranged on a side of the filter screen away from the fan volute, and the upper sealing plate and the lower sealing plate are arranged on the other side of the filter screen away from the fan volute, the lifting sealing plate, the upper sealing plate and the lower sealing plate can move vertically to close the air inlet of the fan volute, the first rotating gear ring is rotatably installed on the side of the lifting sealing plate close to the filter screen, the second rotating gear ring is rotatably installed on the side of the upper sealing plate close to the filter screen, the cleaning scraper is fixedly installed on the side of the first rotating gear ring and the second rotating gear ring close to the filter screen, and when the first rotating gear ring and the second rotating gear ring rotate, the cleaning scraper can rotate and clean the filter screen.

Preferably, the cleaning unit also includes a sealing cylinder, a sealing mounting block and a dust collecting box, the sealing cylinder is fixedly mounted at the air inlet, one end of the sealing cylinder away from the fan volute is fixedly connected to the sealing mounting block, a mounting circular opening is provided on the side of the sealing mounting block close to the sealing cylinder, the filter screen is arranged in the mounting circular opening, the filter screen is fixedly connected to the sealing cylinder, the sealing mounting block is provided with a sealing mounting groove, the lifting sealing plate, the upper sealing plate and the lower sealing plate are all slidably mounted in the sealing mounting groove, a dust collecting port is provided on the bottom surface of the sealing mounting block, the dust collecting box is fixedly mounted at the dust collecting port, a lower dust collecting port is provided on the bottom surface of the lower sealing plate, and the dust collecting box is fixedly connected to the lower dust collecting port.

Preferably, the cleaning unit also includes a lifting cylinder, a cleaning motor and a transmission gear. The lifting cylinder is fixedly mounted at both ends of the sealing mounting block. The output ends of the lifting cylinder close to the lifting sealing plate are fixedly connected to the lifting sealing plate, and the output ends of the lifting cylinder close to the upper sealing plate are fixedly connected to the upper sealing plate and the lower sealing plate respectively. The lifting sealing plate and the upper sealing plate are provided with transmission gears on the side close to the filter, and the transmission gears are respectively meshed with the first rotating gear ring and the second rotating gear ring. The cleaning motor is fixedly mounted on the lifting sealing plate and the upper sealing plate away from the filter, and the driving shaft of the cleaning motor passes through the lifting sealing plate and the upper sealing plate respectively and is fixedly connected to the transmission gear.

Preferably, a centrifugal impeller is arranged in the fan volute, and a rotating shaft is rotatably mounted on the fan volute, the rotating shaft is fixedly connected to the centrifugal impeller, and the rotating shaft passes through the filter screen and extends out of the fan volute.

Preferably, the auxiliary component includes a plurality of cleaning auxiliary units and a plurality of air intake stop units, the air intake stop units are arranged in the fan volute, the air intake stop units include a wind shield cylinder, a connecting block and a stop cylinder, the stop cylinder is fixedly connected to the inner wall of the fan volute, the wind shield cylinder is sleeved on the centrifugal impeller, and a connecting block is fixedly installed on the output end of the stop cylinder, and the connecting block is fixedly connected to the wind shield cylinder.

Preferably, the cleaning auxiliary unit is arranged at the air outlet of the fan volute, and the cleaning auxiliary unit includes an air collecting hood, an air collecting cylinder and a ventilation pipe. The air collecting cylinder is fixedly mounted on the side of the sealing mounting block close to the fan volute, and a connecting plate is fixedly mounted on the output end of the air collecting cylinder, and the connecting plate is fixedly connected to the air collecting hood. One end of the ventilation pipe passes through the sealing cylinder and is fixedly connected to the sealing cylinder, and the other end passes through the air collecting hood and is fixedly connected to the air collecting hood.

Preferably, the bottom end of the fan volute is fixedly connected to a base, a drive motor is fixedly mounted on the base, and a drive shaft of the drive motor is connected to the rotating shaft via a belt.

Preferably, a rotation groove is formed on the bottom surface of the upper sealing plate and the top surface of the lower sealing plate, and when the bottom surface of the upper sealing plate contacts the top surface of the lower sealing plate, the rotation shaft is located in the rotation groove.

Preferably, a partition is arranged in the middle of the centrifugal impeller.

Preferably, the second rotating gear ring is provided with a moving opening, and the width of the moving opening is greater than the diameter of the rotating shaft.

Compared with the prior art, the present invention provides a self-cleaning double-suction centrifugal fan, which has the following beneficial effects:

1. When the filter needs to be cleaned, the lifting sealing plate moves to close the air inlet on one side of the fan volute, the first rotating gear ring rotates to drive the cleaning scraper to rotate, and the cleaning scraper cleans the filter close to the first rotating gear ring. At this time, the air inlet close to the second rotating gear ring is still in an open state. After the cleaning is completed, the lifting sealing plate moves to release the blockage of the air inlet, so that the air inlet is in an open state, the upper sealing plate and the lower sealing plate move to complete the closure of the air inlet on the other side of the fan volute, and the second rotating gear ring rotates periodically to drive the cleaning scraper to rotate, and the cleaning scraper cleans the filter close to the second rotating gear ring, so that the centrifugal motor can be cleaned without stopping, avoiding repeated starting and stopping of the fan for cleaning in harsh environments, thereby increasing the service life of the fan and improving work efficiency.

2. When the cleaning scraper finishes cleaning the filter on one side, the air collecting cylinder drives the air collecting hood to move to the exhaust port of the fan volute. The air collecting hood discharges part of the exhausted gas into the sealing cylinder through the ventilation pipe. When the gas moves from the sealing cylinder to the closed sealing installation groove, the gas passes through the filter and blows out the dust and impurities in the filter holes of the filter to prevent the dust and impurities from clogging the filter holes and reducing the working efficiency of the centrifugal fan.

3. When cleaning the filter on one side, the corresponding stop cylinder drives the wind shield cylinder to move to the exhaust port of the centrifugal impeller and blocks the exhaust port, so that the corresponding air inlet no longer performs air extraction work, ensuring the cleaning effect of the cleaning scraper, preventing the centrifugal impeller from rotating and generating load, and increasing the service life of the device.

Of course, any product implementing the present invention does not necessarily need to achieve all of the above-mentioned advantages at the same time.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the invention, the drawings required for describing the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

FIG1 is a schematic diagram of the overall three-dimensional structure of the present invention;

FIG2 is a second schematic diagram of the overall three-dimensional structure of the present invention;

FIG3 is a partial cross-sectional structural schematic diagram of one of the present invention;

FIG4 is a partial three-dimensional structural schematic diagram of one of the present invention;

FIG5 is a second schematic diagram of a partial three-dimensional structure of the present invention;

FIG6 is a schematic diagram of the structure of A in FIG5 of the present invention;

FIG7 is a second partial cross-sectional structural schematic diagram of the present invention;

FIG8 is a third partial cross-sectional structural schematic diagram of the present invention;

FIG9 is a fourth partial cross-sectional structural schematic diagram of the present invention;

FIG. 10 is a schematic diagram of the structure of the centrifugal impeller of the present invention.

In the accompanying drawings, the components represented by the reference numerals are listed as follows:

1. Fan volute; 2. Cleaning assembly; 21. Cleaning unit; 211. Filter; 212. Cleaning scraper; 213. Sealing cylinder; 214. Sealing mounting block; 215. Dust box; 216. Lifting cylinder; 217. Cleaning motor; 218. Transmission gear; 201. Lifting sealing plate; 202. Upper sealing plate; 203. Lower sealing plate; 204. First rotating gear ring; 205. Second rotating gear ring; 3. Auxiliary assembly; 31. Cleaning auxiliary unit; 311. Wind collecting hood; 312. Wind collecting cylinder; 313. Ventilation pipe; 314. Connecting plate; 32. Air inlet stop unit; 321. Wind shield cylinder; 322. Connecting block; 323. Stop cylinder; 4. Centrifugal impeller; 5. Rotating shaft; 6. Base; 7. Driving motor.

DETAILED DESCRIPTION

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

In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "top", "middle", "inside" and the like indicating orientation or positional relationship are only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the invention.

Embodiment 1, referring to FIGS. 1 to 10 , the present invention is a self-cleaning double-suction centrifugal fan, comprising a fan volute 1, a cleaning component 2 and an auxiliary component 3. Air inlets are provided on both sides of the fan volute 1, and a cleaning component 2 is provided at the air inlet;

The cleaning assembly 2 includes a cleaning unit 21, a lifting sealing plate 201, an upper sealing plate 202, a lower sealing plate 203, a first rotating gear ring 204 and a second rotating gear ring 205;

The cleaning unit 21 is arranged on both sides of the fan volute 1, and the cleaning unit 21 includes a filter 211 and a cleaning scraper 212. The filter 211 is arranged at the air inlet, and the cleaning scraper 212 is arranged on the side of the filter 211 away from the fan volute 1;

The lifting sealing plate 201 is arranged on the side of the filter 211 away from the fan volute 1, and the upper sealing plate 202 and the lower sealing plate 203 are arranged on the other side of the filter 211 away from the fan volute 1. The lifting sealing plate 201, the upper sealing plate 202 and the lower sealing plate 203 can move vertically to close the air inlet of the fan volute 1. The first rotating gear ring 204 is rotatably installed on the side of the lifting sealing plate 201 close to the filter 211, and the second rotating gear ring 205 is rotatably installed on the side of the upper sealing plate 202 close to the filter 211. A cleaning scraper 212 is fixedly installed on the side of the first rotating gear ring 204 and the second rotating gear ring 205 close to the filter 211. When the first rotating gear ring 204 and the second rotating gear ring 205 rotate, the cleaning scraper 212 can rotate and clean the filter 211;

The cleaning scraper 212 cleans the filter screen 211 near the second rotating gear ring 205, so that the centrifugal motor can be cleaned without stopping, thereby avoiding repeated starting and stopping of the fan for cleaning in harsh environments, thereby improving the service life of the fan and working efficiency.

Embodiment 2, different from the above-mentioned embodiment, please refer to Figures 3 and 6, the cleaning unit 21 also includes a sealing cylinder 213, a sealing mounting block 214 and a dust collecting box 215, the sealing cylinder 213 is fixedly installed at the air inlet, the end of the sealing cylinder 213 away from the fan volute 1 is fixedly connected to the sealing mounting block 214, the sealing mounting block 214 is provided with a mounting circular opening on one side close to the sealing cylinder 213, a filter screen 211 is arranged in the mounting circular opening, the filter screen 211 is fixedly connected to the sealing cylinder 213, the sealing mounting block 214 is provided with a sealing mounting groove, the lifting sealing plate 201, the upper sealing plate 202 and the lower sealing plate 203 are all slidably installed in the sealing mounting groove, the bottom surface of the sealing mounting block 214 is provided with a dust collecting port, the dust collecting box 215 is fixedly installed at the dust collecting port, the bottom surface of the lower sealing plate 203 is provided with a lower dust collecting port, and the lower dust collecting port is fixedly connected with the dust collecting box 215;

When cleaning the filter 211 , the lifting sealing plate 201 , the upper sealing plate 202 and the lower sealing plate 203 move to make the sealing installation groove airtight, and the cleaning scraper 212 sweeps the dust and impurities on the filter 211 , and the dust falls into the dust box 215 .

Embodiment 3, different from the above embodiments, please refer to Figures 3 and 7, the cleaning unit 21 also includes a lifting cylinder 216, a cleaning motor 217 and a transmission gear 218, the lifting cylinder 216 is fixedly installed at both ends of the sealing mounting block 214, the output ends of the lifting cylinder 216 close to the lifting sealing plate 201 are fixedly connected to the lifting sealing plate 201, and the output ends of the lifting cylinder 216 close to the upper sealing plate 202 are respectively fixedly connected to the upper sealing plate 202 and the lower sealing plate 203, the lifting sealing plate 201 and the upper sealing plate 202 are provided with a transmission gear 218 on the side close to the filter 211, the transmission gear 218 is respectively meshed with the first rotating gear ring 204 and the second rotating gear ring 205, the lifting sealing plate 201 and the upper sealing plate 202 are fixedly installed on the side away from the filter 211 with a cleaning motor 217, the driving shaft of the cleaning motor 217 passes through the lifting sealing plate 201 and the upper sealing plate 202 and is fixedly connected to the transmission gear 218;

When the filter 211 needs to be cleaned, the lifting cylinder 216 drives the lifting sealing plate 201 to move, so that the corresponding sealing installation groove is sealed, and the cleaning motor 217 drives the transmission gear 218 to rotate, and the transmission gear 218 drives the first rotating gear ring 204 to rotate, and the rotation of the first rotating gear ring 204 drives the cleaning scraper 212 to rotate to clean the filter 211; the lifting cylinder 216 drives the upper sealing plate 202 to move downward and the lower sealing plate 203 to move upward, respectively, so that the corresponding sealing installation groove is sealed, and the cleaning motor 217 drives the transmission gear 218 to rotate, and the transmission gear 218 drives the second rotating gear ring 205 to rotate periodically, and the rotation of the second rotating gear ring 205 drives the cleaning scraper 212 to rotate periodically to clean the filter 211.

Embodiment 4 is different from the above-mentioned embodiments. Please refer to FIG. 1 and FIG. 10 . A centrifugal impeller 4 is disposed in the fan volute 1. A rotating shaft 5 is rotatably mounted on the fan volute 1. The rotating shaft 5 is fixedly connected to the centrifugal impeller 4. The rotating shaft 5 passes through the filter screen 211 and extends out of the fan volute 1.

When the centrifugal fan is working, the rotating shaft 5 rotates to drive the centrifugal impeller 4 to rotate, and the gas is sucked into the fan volute 1 from the air inlet.

Embodiment 5 is different from the above embodiments, please refer to Figures 6 and 9, the auxiliary component 3 includes a plurality of cleaning auxiliary units 31 and a plurality of air intake stop units 32, the air intake stop unit 32 is arranged in the fan volute 1, the air intake stop unit 32 includes a wind shield cylinder 321, a connecting block 322 and a stop cylinder 323, the stop cylinder 323 is fixedly connected to the inner wall of the fan volute 1, the wind shield cylinder 321 is sleeved on the centrifugal impeller 4, the output end of the stop cylinder 323 is fixedly installed with a connecting block 322, and the connecting block 322 is fixedly connected to the wind shield cylinder 321;

When cleaning the filter screen 211 on one side, the corresponding stop cylinder 323 drives the wind shield cylinder 321 to move to the exhaust port of the centrifugal impeller 4 and blocks the exhaust port, so that the corresponding air inlet no longer performs the exhaust work.

Embodiment 6, different from the above embodiments, please refer to FIG. 6, the cleaning auxiliary unit 31 is arranged at the air outlet of the fan volute 1, the cleaning auxiliary unit 31 includes an air collecting hood 311, an air collecting cylinder 312 and a ventilation pipe 313, the air collecting cylinder 312 is fixedly mounted on the side of the sealing mounting block 214 close to the fan volute 1, the output end of the air collecting cylinder 312 is fixedly mounted with a connecting plate 314, the connecting plate 314 is fixedly connected to the air collecting hood 311, one end of the ventilation pipe 313 passes through the sealing cylinder 213 and is fixedly connected to the sealing cylinder 213, and the other end passes through the air collecting hood 311 and is fixedly connected to the air collecting hood 311;

When the cleaning scraper 212 completes cleaning the filter screen 211 on one side, the air collecting cylinder 312 drives the air collecting hood 311 to move, so that the air collecting hood 311 moves to the exhaust port of the fan volute 1, and the air collecting hood 311 discharges part of the exhausted gas into the sealing tube 213 through the ventilation pipe 313. When the gas moves from the sealing tube 213 to the closed sealing installation groove, the gas passes through the filter screen 211 and blows out the dust and impurities in the filter holes of the filter screen 211 to prevent the dust and impurities from clogging the filter holes and reducing the working efficiency of the centrifugal fan.

Embodiment 7 is different from the above-mentioned embodiments. Please refer to FIG. 1 and FIG. 2 . The bottom end of the fan volute 1 is fixedly connected to a base 6 . A drive motor 7 is fixedly mounted on the base 6 . The drive shaft of the drive motor 7 is connected to the rotating shaft 5 through a belt.

When in use, the driving motor 7 rotates and drives the rotating shaft 5 to rotate through the belt.

Embodiment 8 is different from the above embodiment, please refer to FIG. 4 , the bottom surface of the upper sealing plate 202 and the top surface of the lower sealing plate 203 are provided with a rotation groove, when the bottom surface of the upper sealing plate 202 contacts the top surface of the lower sealing plate 203, the rotation shaft 5 is located in the rotation groove;

When the bottom surface of the upper sealing plate 202 contacts the top surface of the lower sealing plate 203, the moving grooves of the two form a circular groove, and the rotating shaft 5 rotates in the circular groove.

Embodiment 9 is different from the above embodiment, please refer to FIG. 10 , a partition is provided in the middle of the centrifugal impeller 4;

When in use, the impellers on both sides of the partition plate draw air from the air inlets on both sides of the fan volute 1 respectively.

Embodiment 10 is different from the above embodiment, please refer to FIG. 7 , the second rotating gear ring 205 is provided with a moving opening, and the width of the moving opening is greater than the diameter of the rotating shaft 5;

When the upper sealing plate 202 moves vertically, the second rotating gear ring 205 rotates in a circular manner so that the moving opening is located at the lowest end of the second rotating gear ring 205 , and the second rotating gear ring 205 can pass through the rotating shaft 5 .

In summary, with the aid of the above technical solution of the present invention, when the device is used, the rotating shaft 5 rotates to drive the centrifugal impeller 4 to rotate, and the gas is drawn from the air inlet through the filter screen 211 into the fan volute 1, and discharged from the exhaust port of the fan volute 1. When the filter screen 211 needs to be cleaned, the lifting cylinder 216 drives the lifting sealing plate 201 to move, so that the corresponding sealing installation groove is sealed, so that the air inlet on one side of the fan volute 1 is closed, and the corresponding stop cylinder 323 drives the windshield cylinder 321 to move, so that the windshield cylinder 321 moves to the exhaust port of the centrifugal impeller 4, and blocks the exhaust port, so that the corresponding air inlet no longer performs the exhaust work, and the cleaning motor 217 drives the transmission gear The wheel 218 rotates, and the transmission gear 218 drives the first rotating gear ring 204 to rotate. The rotation of the first rotating gear ring 204 drives the cleaning scraper 212 to rotate to clean the filter 211. The cleaning scraper 212 sweeps the dust and impurities on the filter 211, and the dust falls into the dust box 215. At this time, the air inlet near the second rotating gear ring 205 is still in an open state. After the cleaning is completed, the lifting cylinder 216 drives the lifting sealing plate 201 to move, releases the closure of the air inlet, and makes the air inlet open. The corresponding stop cylinder 323 drives the windshield cylinder 321 to move, so that the windshield cylinder 321 releases the shielding of the exhaust port; the lifting cylinder 216 drives The upper sealing plate 202 moves downward, and the lower sealing plate 203 moves upward, so that the corresponding sealing installation groove is sealed, and the corresponding stop cylinder 323 drives the wind shield cylinder 321 to move, so that the wind shield cylinder 321 moves to the exhaust port of the centrifugal impeller 4 and blocks the exhaust port, so that the corresponding air inlet no longer performs the exhaust work, and the cleaning motor 217 drives the transmission gear 218 to rotate, and the transmission gear 218 drives the second rotating gear ring 205 to rotate periodically, and the rotation of the second rotating gear ring 205 drives the cleaning scraper 212 to rotate periodically to clean the filter screen 211, and the cleaning scraper 212 sweeps the dust and impurities on the filter screen 211, and the dust falls into the dust box 215. The centrifugal motor can be cleaned without stopping, avoiding repeated starting and stopping of the fan for cleaning in harsh environments, thereby increasing the service life of the fan and improving work efficiency. When the cleaning scraper 212 completes cleaning the filter screen 211 on one side, the air collecting cylinder 312 drives the air collecting hood 311 to move, so that the air collecting hood 311 moves to the exhaust port of the fan volute 1, and the air collecting hood 311 discharges part of the exhausted gas into the sealing tube 213 through the ventilation pipe 313. When the gas moves from the sealing tube 213 to the closed sealing installation groove, the gas passes through the filter screen 211 and blows out the dust and impurities in the filter holes of the filter screen 211, so as to prevent the dust and impurities from clogging the filter holes and reducing the work efficiency of the centrifugal fan.

In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

The preferred embodiments of the invention disclosed above are only used to help illustrate the invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the invention, so that those skilled in the art can better understand and use the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims (10)

1. The utility model provides a self-cleaning double suction centrifugal fan, includes fan spiral case, clearance subassembly and auxiliary assembly, its characterized in that: the two sides of the fan volute are provided with air inlets, and the cleaning assembly is arranged at the air inlet;

The cleaning assembly comprises a cleaning unit, a lifting sealing plate, an upper sealing plate, a lower sealing plate, a first rotating toothed ring and a second rotating toothed ring;

the cleaning unit is arranged on two sides of the fan volute, the cleaning unit comprises a filter screen and a cleaning scraping plate, the filter screen is arranged at the air inlet, and the cleaning scraping plate is arranged on one side, away from the fan volute, of the filter screen;

The lifting sealing plate is arranged on one side of the filter screen, which is far away from the fan volute, the upper sealing plate and the lower sealing plate are arranged on the other side of the filter screen, which is far away from the fan volute, the lifting sealing plate, the upper sealing plate and the lower sealing plate can vertically move to enable the air inlet of the fan volute to be closed, the first rotating toothed ring is rotatably arranged on one side of the lifting sealing plate, which is close to the filter screen, the second rotating toothed ring is rotatably arranged on one side of the upper sealing plate, which is close to the filter screen, the first rotating toothed ring and the second rotating toothed ring are fixedly arranged on one side of the filter screen, which is fixedly provided with a cleaning scraping plate, and when the first rotating toothed ring and the second rotating toothed ring rotate, the cleaning scraping plate can rotate and clean the filter screen.

2. The self-cleaning double-suction centrifugal fan according to claim 1, wherein the cleaning unit further comprises a sealing cylinder, a sealing installation block and a dust collecting box, the sealing cylinder is fixedly installed at the air inlet, one end of the sealing cylinder, far away from the fan volute, is fixedly connected with the sealing installation block, an installation round opening is formed in one side, close to the sealing cylinder, of the sealing installation block, the filter screen is fixedly connected with the sealing cylinder, the sealing installation block is provided with a sealing installation groove, the lifting sealing plate, the upper sealing plate and the lower sealing plate are all slidably installed in the sealing installation groove, the dust collecting opening is formed in the bottom surface of the sealing installation block, the dust collecting box is fixedly installed at the dust collecting opening, the lower dust collecting opening is formed in the bottom surface of the lower sealing plate, and the dust collecting box is fixedly connected with the bottom surface of the lower dust collecting opening.

3. The self-cleaning double-suction centrifugal fan according to claim 2, wherein the cleaning unit further comprises a lifting cylinder, a cleaning motor and a transmission gear, the lifting cylinder is fixedly installed at two ends of the sealing installation block, the output end of the lifting cylinder, which is close to one side of the lifting sealing plate, is fixedly connected with the lifting sealing plate, the output end of the lifting cylinder, which is close to one side of the upper sealing plate, is fixedly connected with the upper sealing plate and the lower sealing plate, the transmission gear is arranged on one side, which is close to the filter screen, of the lifting sealing plate and the upper sealing plate, the transmission gear is meshed with the first rotating toothed ring and the second rotating toothed ring, the cleaning motor is fixedly installed on one side, which is far away from the filter screen, of the lifting sealing plate and the upper sealing plate, and a driving shaft of the cleaning motor penetrates through the lifting sealing plate and the upper sealing plate and is fixedly connected with the transmission gear.

4. A self-cleaning double-suction centrifugal fan as claimed in claim 3, wherein a centrifugal impeller is arranged in the fan volute, a rotating shaft is rotatably arranged in the fan volute, the rotating shaft is fixedly connected with the centrifugal impeller, and the rotating shaft extends out of the fan volute through the filter screen.

5. The self-cleaning double-suction centrifugal fan according to claim 4, wherein the auxiliary assembly comprises a plurality of cleaning auxiliary units and a plurality of air inlet stopping units, the air inlet stopping units are arranged in the fan volute, each air inlet stopping unit comprises a wind shielding cylinder, a connecting block and a stopping cylinder, the stopping cylinders are fixedly connected with the inner wall of the fan volute, the wind shielding cylinders are sleeved on the centrifugal impeller, the connecting blocks are fixedly arranged at the output ends of the stopping cylinders, and the connecting blocks are fixedly connected with the wind shielding cylinders.

6. The self-cleaning double-suction centrifugal fan according to claim 5, wherein the cleaning auxiliary unit is arranged at an air outlet of the fan volute, the cleaning auxiliary unit comprises a wind collecting cover, a wind collecting cylinder and a ventilation pipe, the wind collecting cylinder is fixedly arranged at one side, close to the fan volute, of the sealing installation block, a connecting plate is fixedly arranged at the output end of the wind collecting cylinder, the connecting plate is fixedly connected with the wind collecting cover, one end of the ventilation pipe penetrates through the sealing cylinder and is fixedly connected with the sealing cylinder, and the other end of the ventilation pipe penetrates through the wind collecting cover and is fixedly connected with the wind collecting cover.

7. The self-cleaning double-suction centrifugal fan according to claim 6, wherein a base is fixedly connected to the bottom end of the fan volute, a driving motor is fixedly installed on the base, and a driving shaft of the driving motor is connected with the rotating shaft through a belt.

8. The self-cleaning double suction centrifugal fan as claimed in claim 4, wherein the upper sealing plate has a rotation groove formed in a bottom surface thereof and a top surface thereof, and the rotation shaft is positioned in the rotation groove when the bottom surface of the upper sealing plate contacts the top surface of the lower sealing plate.

9. The self-cleaning double suction centrifugal fan as claimed in claim 4, wherein a partition plate is provided in the middle of the centrifugal impeller.

10. The self-cleaning double suction centrifugal fan as claimed in claim 4, wherein the second rotating toothed ring is provided with a moving opening, and the width of the moving opening is larger than the diameter of the rotating shaft.