Fire-fighting centrifugal fan

Abstract

The application discloses a fire-fighting centrifugal fan, which comprises a base and a casing arranged on the base, one end of the casing is provided with a driving motor, the output end of the driving motor is provided with a mounting shaft penetrating through the casing, the mounting shaft is provided with an impeller assembly inside the casing, the air inlet side of the casing is provided with a filtering mechanism, a butt joint assembly is connected between the filtering mechanism and the end of the mounting shaft, the lower end of the casing is provided with a controller, the side of the casing away from the air inlet is provided with an access door, and the air outlet of the upper end of the casing is provided with a wind speed sensor; the fire-fighting centrifugal fan has the advantages of simple structure and reasonable design, the air inlet of the fire-fighting centrifugal fan is effectively filtered and protected by a plurality of annular filter sheets, and after blockage occurs, the scraping piece cooperates with the guide groove to rapidly clean and dredge the blockage on the surface and inside of the filter sheet without stopping the machine, so that the working process and the air exhaust volume of the fan are not affected.

Description

Technical Field

[0001] This invention relates to the field of centrifugal fan equipment technology, specifically a fire-fighting centrifugal fan. Background Technology

[0002] In today's society, with the acceleration of urbanization and the increasing density of various buildings, fire safety has become a crucial aspect of public safety. Fire-fighting fans, as key equipment in fire protection systems, play a vital role in supplying air and exhausting smoke during emergencies such as fires, and are irreplaceable in ensuring the evacuation of personnel and minimizing property damage. Fire-fighting fans not only need to possess high efficiency and stable performance, but also need to be able to adapt to various complex environments, ensuring rapid startup and continuous stable operation in emergencies.

[0003] Traditional devices have the following shortcomings:

[0004] Existing fire-fighting fans typically consist of basic components such as a casing, drive motor, and impeller assembly, with a design focus on providing sufficient airflow and pressure in emergency situations. However, to ensure efficient operation in emergencies, most fire-fighting fans are not designed with filtration systems. This is because filters are easily clogged by dust and debris during operation, severely impacting ventilation efficiency and potentially causing the fan to malfunction. Furthermore, in actual operation, the high airflow velocity of fire-fighting fans often draws in surrounding debris, dust, and other foreign objects. Once inside, these objects easily collide with the high-speed rotating impeller, damaging the blades and affecting the fan's lifespan and reliability. Therefore, traditional fire-fighting centrifugal fans are no longer sufficient to meet the demands of fire-fighting smoke extraction or ventilation in today's complex environments. Summary of the Invention

[0005] The purpose of this invention is to provide a fire-fighting centrifugal fan to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a fire-fighting centrifugal fan, comprising a base and a casing mounted on the base, a drive motor being disposed at one end inside the casing, an output shaft penetrating the casing being disposed at the output end of the drive motor, an impeller assembly being disposed on the mounting shaft inside the casing, a filter mechanism being disposed on the air inlet side of the casing, a docking assembly being connected between the filter mechanism and the end of the mounting shaft, a controller being disposed at the lower end of the casing, an inspection door being disposed on the side of the casing away from the air inlet, and a wind speed sensor being disposed at the air outlet at the upper end of the casing;

[0007] The filtration mechanism includes:

[0008] A positioning frame is provided in the slot on the air inlet side of the housing. Several rings of filter sheets are provided on the outer side of the positioning frame. The filter sheets are in the shape of a ring and are concentrically arranged on the positioning frame.

[0009] Mounting base, the mounting base is rotatably connected to one end of the through hole in the center of the positioning frame, and a carrier strip is provided on one side of the mounting base. The end of the carrier strip away from the mounting base is slidably connected to a sliding groove on the outer wall of the housing.

[0010] A scraper blade is disposed on one side of the carrier strip and between every two adjacent filter discs. The scraper blade is used to scrape off debris from the surface of the filter discs or embedded between the gaps in the filter discs. The end of the scraper blade is beveled.

[0011] A guide groove is provided on the end face of the carrier bar to discharge the waste scraped off by the scraper.

[0012] Preferably, the docking component includes:

[0013] A square hole is formed inside the mounting base, and a square shaft is slidably connected inside the square hole. An electromagnet is provided on the end face of the mounting base outside the square shaft.

[0014] A friction plate is disposed at the end of the square shaft away from the mounting base, and a permanent magnet matching the electromagnet is disposed on the end face of the friction plate outside the square shaft;

[0015] A docking seat is provided at the end of the mounting shaft. Several positioning rods are arranged in a ring in the mounting groove on one side of the docking seat. The end of each positioning rod is slidably connected to a horizontally movable friction ring. A return spring is sleeved on the positioning rod.

[0016] Two toothed discs are respectively disposed on one end face of the friction plate and in the mounting groove on one side of the mating seat. The teeth of the two toothed discs are matched with each other. The friction ring is located outside the toothed disc on the mating seat and protrudes from the toothed disc.

[0017] Preferably, a dust collection ring is provided on the outer wall of the housing outside the guide groove, and a receiving cover is provided at the end of the guide groove to guide the waste discharged from the guide groove into the dust collection ring.

[0018] Preferably, the impeller assembly includes:

[0019] The impeller frame is mounted on the mounting shaft inside the casing. A first positioning groove is provided on the ring on the air inlet side of the impeller frame, and a second positioning groove is provided through the side of the impeller frame adjacent to the maintenance door.

[0020] The blade is movably disposed at the end of the first positioning groove and the second positioning groove away from the mounting shaft. The first positioning groove and the second positioning groove are provided with bosses for supporting the blade. The impeller frame is provided with a magnetic sheet for adsorbing the blade on one side of the first positioning groove and the second positioning groove.

[0021] A grip bar is provided at the end of the blade adjacent to the inspection door.

[0022] Preferably, the bosses and magnetic sheets in the first and second positioning grooves are located on one side of the driving blades in the first and second positioning grooves.

[0023] Preferably, a balance bar is provided on the side of the mounting base away from the carrier bar, and the end of the balance bar away from the mounting base is slidably connected to a groove on the outer wall of the housing.

[0024] Preferably, a limiting ring is provided at the end of the mating seat located outside the friction ring.

[0025] Preferably, the lower end of the ash collecting ring is provided with an ash discharge port.

[0026] Preferably, the controller is electrically connected to the drive motor, the wind speed sensor, and the electromagnet via wires.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] This invention features a filtration mechanism that uses several annular filter discs to effectively filter and protect the air inlet of a fire-fighting centrifugal fan. In the event of blockage, scrapers and guide grooves can quickly clean and unclog the blockages on the surface and inside of the filter discs without shutting down the machine. This provides effective protection for the internal structure and blades of the fire-fighting fan and ensures that blockages do not affect the fan's operation or exhaust volume during high-intensity or emergency ventilation operations. This significantly improves the fan's efficiency and reliability, extends its service life, and better meets the needs of fire-fighting smoke extraction or ventilation in complex environments.

[0029] This invention, by setting up a docking component, achieves the effect of driving the scraper to rotate using the power of a drive motor. By controlling the magnitude of the current, the magnetic force between the friction plate and the friction ring can be adjusted, thereby adjusting the torque and speed of the scraper. At the same time, the friction plate and the friction ring can play a pre-acceleration role before the two toothed discs mesh, avoiding large impacts caused by excessive speed difference between the two toothed discs, and further extending the overall working life.

[0030] This invention, by setting up a dust collection ring and a receiving cover, guides the waste collected by the guide channel into the dust collection ring and discharges it uniformly from below, preventing it from splashing into the external environment and avoiding damage to nearby operators and the environment. At the same time, by setting the cross-sectional profile of the dust collection ring, the waste entering the dust collection ring at high speed can be effectively buffered, avoiding high-speed impact or internal splashing that could damage the shell of the dust collection ring.

[0031] This invention, by incorporating an impeller assembly, enables the blades to be movably mounted as independent units within the impeller frame. Damaged blades can be replaced quickly and individually, making the operation simple and efficient. This significantly improves the ease of maintenance for the fan and further reduces maintenance costs compared to traditional centrifugal fans where only the entire impeller can be replaced. Attached Figure Description

[0032] Figure 1 This is a first-view overall perspective view of the present invention;

[0033] Figure 2 This is a second-view overall perspective view of the present invention;

[0034] Figure 3 This is a schematic diagram of the overall internal structure of the present invention;

[0035] Figure 4 For the present invention Figure 3 An enlarged view of point A in the diagram;

[0036] Figure 5 For the present invention Figure 3 An enlarged schematic diagram at point B;

[0037] Figure 6 This is a three-dimensional schematic diagram of the carrier strip, scraper, and guide groove of the present invention;

[0038] Figure 7 This is a three-dimensional structural diagram of the filtration mechanism of the present invention;

[0039] Figure 8 This is a three-dimensional schematic diagram of the impeller assembly of the present invention;

[0040] Figure 9 This is a schematic diagram of the three-dimensional structure of the impeller frame of the present invention;

[0041] Figure 10 This is a three-dimensional schematic diagram of the blade of the present invention;

[0042] Figure 11 This is a schematic diagram of the connection structure between the blade and the impeller frame of the present invention.

[0043] In the diagram: 1. Base; 2. Housing; 3. Drive motor; 4. Mounting shaft; 5. Impeller assembly; 501. Impeller frame; 502. First positioning groove; 503. Second positioning groove; 504. Blade; 505. Magnetic sheet; 506. Handle bar; 6. Filtering mechanism; 601. Positioning frame; 602. Filter disc; 603. Mounting base; 604. Carrier bar; 6041. Balance bar; 605. Scraper; 606. Guide groove 607. Ash collection ring; 6071. Ash discharge port; 608. Connecting cover; 7. Docking assembly; 701. Square hole; 702. Square shaft; 703. Electromagnet; 704. Friction plate; 705. Permanent magnet; 706. Docking seat; 7061. Limiting ring; 707. Positioning rod; 708. Friction ring; 709. Return spring; 710. Two gear discs; 8. Controller; 9. Inspection door; 10. Wind speed sensor. Detailed Implementation

[0044] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0045] It should be noted that when an element is referred to as "fixed," "mounted," "connected," or "set" with another element, it can be directly on or indirectly on the other element. It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0046] As a further improvement of the present invention, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0047] Please see Figure 1-11As shown, the present invention provides a technical solution for a fire-fighting centrifugal fan: a fire-fighting centrifugal fan includes a base 1 and a casing 2 mounted on the base 1. A drive motor 3 is mounted on one end of the casing 2 via a bracket. The output end of the drive motor 3 is connected to a mounting shaft 4 that passes through the casing 2. An impeller assembly 5 is mounted on the mounting shaft 4 inside the casing 2. A filter mechanism 6 is mounted on the air inlet side of the casing 2 to block and remove garbage. A docking assembly 7 is connected between the end of the filter mechanism 6 and the end of the mounting shaft 4 to control the power output of the mounting shaft 4 to the filter mechanism 6. A controller 8 is mounted on the lower end of the casing 2. An inspection door 9 is opened on the side of the casing 2 away from the air inlet. A wind speed sensor 10 is mounted at the air outlet at the upper end of the casing 2 to determine the blockage of the air inlet by garbage.

[0048] The filtration mechanism 6 includes a positioning frame 601, a mounting base 603, a scraper 605, and a guide groove 606. The positioning frame 601 is fixedly installed in the slot on the air inlet side of the housing 2. Several rings of filter discs 602 are fixedly installed on the outer side of the positioning frame 601. The filter discs 602 are circular and concentrically layered on the positioning frame 601. The mounting base 603 is rotatably connected to one end of the through hole in the center of the positioning frame 601. A carrier strip 604 is fixedly connected to one side of the mounting base 603, and the other side of the mounting base 603 is connected to the docking assembly 7. The end of the carrier strip 604 away from the mounting base 603 is slidably connected to a sliding groove on the outer wall of the housing 2. The carrier strip 604 can rotate on the surface of the filter discs 602 and the positioning frame 601 with the mounting shaft 4 as the axis. A scraper 605 is installed on one side of the carrier strip 604 and located between every two adjacent filter discs 602. Driven by the carrier strip 604, the scraper 605 rotates along the inner and outer walls of the filter discs 602 to scrape away debris from the surface of the filter discs 602 or embedded in the gaps between the filter discs 602. The end of the scraper 605 is beveled. When cleaning debris from the gaps between the filter discs 602, the beveled surface of the scraper 605 contacts the debris first, and the debris can be moved out of the gaps along the beveled surface of the scraper 605 under the thrust of the scraper 605. A guide groove 606 is installed on the end face of the carrier strip 604 to guide the debris scraped off by the scraper 605, preventing the debris from being sucked back onto the filter discs 602 under negative pressure. The windward side of the guide groove 606 is beveled to reduce wind resistance.

[0049] When the fire-fighting centrifugal fan is running, if the filter 602 becomes clogged with debris, the wind speed sensor 10 will detect a decrease in wind speed and send the data to the controller 8. The controller 8 then controls the docking assembly 7 to output power to the mounting base 603 via the mounting shaft 4. The mounting base 603 then rotates the carrier bar 604 and each scraper 605. Debris stuck in the gaps of the filter 602 is lifted and pushed out of the gaps by the inclined surface of the scraper 605 as it passes. Debris remaining on the surface of the filter 602 is directly lifted by the scraper 605 as it passes. This debris is then caught by the synchronously rotating guide groove 606 behind the carrier bar 604. Due to the centrifugal force during the rotation of the guide groove 606, the debris slides out along the inner wall of the guide groove 606 and does not accumulate inside. When the controller 8 determines that the wind speed has recovered through the wind speed sensor 10, it can disconnect the power input to the mounting base 603, at which point the cleaning function of the fire-fighting centrifugal fan is turned off. Throughout the entire process of unblocking and cleaning, the normal ventilation or air supply operation of the fire-fighting fan is not affected.

[0050] The filtration mechanism 6 utilizes several annular filter plates 602 to effectively filter and protect the air inlet of the fire-fighting centrifugal fan. In the event of blockage, the scraper 605, in conjunction with the guide groove 606, can quickly clean and unclog the blockage on the surface and inside of the filter plates 602 without shutting down the machine. This provides effective protection for the internal structure and blades of the fire-fighting fan and ensures that blockage will not affect the fan's operation during high-intensity or emergency ventilation operations. This significantly improves the fan's efficiency and reliability, extends its service life, and better meets the needs of fire smoke extraction or ventilation in complex environments.

[0051] The docking assembly 7 includes a square hole 701, a friction plate 704, a docking seat 706, and two geared discs 710. The square hole 701 is formed inside the mounting seat 603, and a square shaft 702 is slidably connected inside the square hole 701. An electromagnet 703 is fixedly mounted on the end face of the mounting seat 603, outside the square shaft 702. The friction plate 704 is mounted on the end of the square shaft 702 away from the mounting seat 603. A permanent magnet 705 matching the electromagnet 703 is mounted on the end face of the friction plate 704, outside the square shaft 702. The horizontal movement of the friction plate 704 is controlled by the attractive and repulsive forces of the electromagnet 703 on the permanent magnet 705. The greater the current passing through the electromagnet 703, the greater the attractive and repulsive forces. The mating seat 706 is integrally formed and machined at the end of the mounting shaft 4. Several positioning rods 707 are annularly installed in the mounting groove on one side of the mating seat 706. The ends of the positioning rods 707 are slidably connected to a horizontally movable friction ring 708. A return spring 709 is sleeved on the positioning rods 707 to push the friction ring 708 outward. Two geared discs 710 are respectively fixedly installed on one end face of the friction plate 704 and in the mounting groove on one side of the mating seat 706. The teeth of the two geared discs 710 are matched with each other. The friction ring 708 is located outside the geared discs 710 on the mating seat 706 and protrudes from the geared discs 710.

[0052] When power output to the mounting base 603 is required via the mounting shaft 4, the controller 8 controls the electromagnet 703 to generate a repulsive force on the permanent magnet 705. Under the action of the repulsive force, the lower shaft 702 and the friction plate 704 slide out along the square hole 701 until the friction plate 704 contacts the friction ring 708. At this time, the friction ring 708 drives the square shaft 702 and the mounting base 603 to rotate through friction, and the filter mechanism 6 starts to operate, and the scraper 605 starts to rotate. As the current passing through the electromagnet 703 increases, the repulsive force on the friction plate 704 also increases, the torque of the scraper 605 increases, and the rotation speed increases. The friction ring 708 overcomes the elasticity of the return spring 709 and is squeezed towards the inside of the docking seat 706 until the two toothed discs 710 on both sides mesh and dock. At this time, the rotation speed of the mounting base 603 is synchronized with the mounting shaft 4, and the scraper 605 reaches its fastest rotation speed. In practical applications, the current passing through the electromagnet 703 can be adjusted and set by the controller 8 according to the required rotation speed of the scraper 605 or the stubbornness of the garbage adhesion.

[0053] By connecting the assembly 7, the scraper 605 is driven to rotate by the power of the drive motor 3. By controlling the magnitude of the current, the magnetic force between the friction plate 704 and the friction ring 708 can be adjusted, thereby adjusting the torque and speed of the scraper 605. At the same time, before the two toothed discs 710 mesh, the friction plate 704 and the friction ring 708 can play a pre-acceleration role, avoiding large impact caused by the large speed difference between the two toothed discs 710, and further extending the overall working life.

[0054] A dust collection ring 607 is installed on the outer wall of the housing 2, outside the guide channel 606. An integrally formed receiving cover 608 is machined at the end of the guide channel 606 to guide the waste discharged from the guide channel 606 into the dust collection ring 607. A dust discharge port 6071 is provided at the lower end of the dust collection ring 607. The cross-sectional profile of the dust collection ring 607 is as follows... Figure 4 As shown, after being discharged by centrifugal force through the guide channel 606, the waste is guided into the ash collection ring 607 by the receiving cover 608. It first slides along the inner wall of the outer ring of the ash collection ring 607 until it enters the inner ring, where its kinetic energy is buffered. Then, under the influence of gravity, it slides down the inner wall of the inner ring of the ash collection ring 607 and finally falls out from the ash discharge port 6071 at the bottom. Through the ash collection ring 607 and the receiving cover 608, the waste collected by the guide channel 606 is guided into the ash collection ring 607 and discharged uniformly from the bottom, preventing splashing into the external environment and avoiding damage to nearby operators and the environment. At the same time, the design of the cross-sectional profile of the ash collection ring 607 effectively buffers the waste entering the ash collection ring 607 at high speed, preventing high-speed impact or internal splashing that could damage the shell of the ash collection ring 607.

[0055] The impeller assembly 5 includes an impeller frame 501, blades 504, and a handle 506. The impeller frame 501 is fixedly mounted on the mounting shaft 4 inside the casing 2. Both the outer side of the impeller frame 501 and the inner wall of the casing 2 are provided with ball grooves, which are connected by ball sliding. This improves the stability of the impeller frame 501 during rotation and avoids the impact between the two during operation. A first positioning groove 502 is provided on the ring on the air inlet side of the impeller frame 501, and a second positioning groove 503 is provided through the side of the impeller frame 501 adjacent to the maintenance door 9. The blade 504 is movably mounted on the end of the first positioning groove 502 and the second positioning groove 503 away from the mounting shaft 4. Bosses for supporting the blade 504 are provided within the first and second positioning grooves 502 and 503. A magnetic sheet 505 for adsorbing the blade 504 is slotted on one side of the impeller frame 501, located within the first and second positioning grooves 502 and 503. If the blade 504 is made of a non-magnetic material, an additional layer of magnetic sheet 505 needs to be added to the sidewall of the blade 504. The blade 504 is fixed by the support of the bosses within the first and second positioning grooves 502 and 503 and by the adsorption of the magnetic sheet 505. The bosses and magnetic sheet 505 within the first and second positioning grooves 502 and 503 are all located on the side of the first and second positioning grooves 502 and 503 that pushes the blade 504, ensuring the dynamic and static stability between the blade 504 and the impeller frame 501. A grip bar 506 is installed at the end of the blade 504 adjacent to the inspection door 9.

[0056] When blade 504 is damaged and needs to be replaced, the operator can manually open the inspection door 9, grasp the handle 506 and push it away from the magnet 505 until blade 504 overcomes the attraction of magnet 505 and moves to the side of the first positioning groove 502 and the second positioning groove 503 without the boss. Then, move blade 504 downward along the first positioning groove 502 and the second positioning groove 503 until blade 504 is freed from the limit of the side wall of the second positioning groove 503 and can move horizontally axially. Then it can be directly pulled out from the inspection door 9.

[0057] By using the impeller assembly 5, the blades 504 are transformed into independent units that can be moved and set within the impeller frame 501. Damaged blades 504 can be replaced quickly and individually, making the operation simple and efficient. This significantly improves the convenience of fan maintenance and further reduces maintenance costs compared to traditional centrifugal fans where only the entire impeller can be replaced.

[0058] A balance bar 6041 is installed on the side of the mounting base 603 away from the carrier bar 604. The end of the balance bar 6041 away from the mounting base 603 is slidably connected to a groove on the outer wall of the housing 2. The mass of the balance bar 6041 should be close to the sum of the masses of the carrier bar 604, the scraper 605 and the guide groove 606, depending on the material selection. When the filter mechanism 6 is running, the high-speed rotation of the carrier bar 604 will generate a large centrifugal force on the mounting base 603. The balance bar 6041 can balance the centrifugal force to ensure the stability of the filter mechanism 6 during operation.

[0059] A limiting ring 7061 is provided at the end of the mating seat 706 outside the friction ring 708. The cross section of the limiting ring 7061 is an inclined surface to prevent the friction plate 704 from being skewed when it moves horizontally in the axial direction, thus affecting the friction and the meshing of the two toothed discs 710.

[0060] The controller 8 is electrically connected to the drive motor 3, the wind speed sensor 10 and the electromagnet 703 via wires.

[0061] Working principle: When the fire-fighting centrifugal fan is running, if the filter 602 is clogged with debris, the wind speed sensor 10 will detect the decrease in wind speed and send the data to the controller 8. The controller 8 controls the electromagnet 703 to generate a repulsive force on the permanent magnet 705. Under the action of the repulsive force, the shaft 702 and the friction plate 704 slide out along the square hole 701 until the friction plate 704 contacts the friction ring 708. The mounting base 603 then starts to drive the carrier bar 604 and each scraper 605 to rotate. Subsequently, the controller 8 sets the current according to the wind speed and gradually controls the current to increase to the set value. Debris stuck in the gaps of the filter disc 602 is lifted and pushed out of the gaps by the inclined surface of the scraper 605 as it passes. Debris remaining on the surface of the filter disc 602 is directly lifted by the scraper 605 as it passes. This debris is then caught by the synchronously rotating guide groove 606 behind it via the carrier bar 604. Due to the centrifugal force during the rotation of the guide groove 606, the debris slides out along the inner wall of the guide groove 606 and is guided into the ash collection ring 607 by the receiving cover 608. It first slides along the inner wall of the outer ring of the ash collection ring 607 until it slides into the inner ring, where its kinetic energy is buffered. Then, under the action of gravity, it slides down along the inner wall of the inner ring of the ash collection ring 607 and finally falls out of the ash discharge port 6071 below. When the controller 8 determines that the wind speed has recovered through the wind speed sensor 10, it can disconnect the power input of the mounting base 603. At this time, the cleaning function of the fire centrifugal fan is turned off. Throughout the entire process of unblocking and cleaning, the normal ventilation or air supply operation of the fire-fighting fan is not affected.

[0062] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0063] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fire-fighting centrifugal fan, comprising a base (1) and a casing (2) disposed on the base (1), characterized in that: A drive motor (3) is provided at one end inside the housing (2). A mounting shaft (4) that passes through the housing (2) is provided at the output end of the drive motor (3). An impeller assembly (5) is provided on the mounting shaft (4) inside the housing (2). A filter mechanism (6) is provided on the air inlet side of the housing (2). A docking assembly (7) is connected between the end of the filter mechanism (6) and the end of the mounting shaft (4). A controller (8) is provided at the lower end of the housing (2). An inspection door (9) is provided on the side of the housing (2) away from the air inlet. A wind speed sensor (10) is provided at the air outlet at the upper end of the housing (2). The filtration mechanism (6) includes: Positioning frame (601) is set in the slot on the air inlet side of the housing (2). Several rings of filter sheets (602) are set on the outside of the positioning frame (601). The filter sheets (602) are in the shape of a ring and are concentrically set on the positioning frame (601). Mounting base (603), which is rotatably connected to one end of the through hole in the center of the positioning frame (601). A carrier strip (604) is provided on one side of the mounting base (603). The end of the carrier strip (604) away from the mounting base (603) is slidably connected to the sliding groove on the outer wall of the housing (2). A scraper (605) is disposed on one side of the carrier strip (604) and located between every two adjacent filter discs (602). The scraper (605) is used to scrape off debris from the surface of the filter disc (602) or embedded between the gaps of the filter disc (602). The end of the scraper (605) is beveled. A guide groove (606) is provided on the end face of the carrier strip (604) for discharging the waste scraped off by the scraper (605).

2. The fire-fighting centrifugal fan according to claim 1, characterized in that: The docking component (7) includes: A square hole (701) is formed inside the mounting base (603). A square shaft (702) is slidably connected inside the square hole (701). An electromagnet (703) is provided on the end face of the mounting base (603) outside the square shaft (702). Friction plate (704), the friction plate (704) is disposed at one end of the square shaft (702) away from the mounting base (603), and a permanent magnet (705) matching the electromagnet (703) is disposed on the end face of the friction plate (704) outside the square shaft (702). A docking seat (706) is provided at the end of the mounting shaft (4). A plurality of positioning rods (707) are arranged in a ring in the mounting groove on one side of the docking seat (706). A horizontally movable friction ring (708) is slidably connected to the end of the positioning rod (707). A return spring (709) is sleeved on the positioning rod (707). Two toothed discs (710) are respectively disposed on one side end face of the friction plate (704) and in the mounting groove on one side of the docking seat (706). The teeth of the two toothed discs (710) are matched with each other. The friction ring (708) is located outside the toothed disc (710) on the docking seat (706) and protrudes from the toothed disc (710).

3. The fire-fighting centrifugal fan according to claim 1, characterized in that: A dust collection ring (607) is provided on the outer wall of the housing (2) outside the guide groove (606), and a receiving cover (608) is provided at the end of the guide groove (606) to introduce the garbage discharged from the guide groove (606) into the dust collection ring (607).

4. The fire-fighting centrifugal fan according to claim 1, characterized in that: The impeller assembly (5) includes: Impeller frame (501) is mounted on the mounting shaft (4) inside the casing (2). A first positioning groove (502) is provided on the ring on the air inlet side of the impeller frame (501). A second positioning groove (503) is provided on the side of the impeller frame (501) adjacent to the inspection door (9). The blade (504) is movably disposed at one end of the first positioning groove (502) and the second positioning groove (503) away from the mounting shaft (4). The first positioning groove (502) and the second positioning groove (503) are provided with bosses for supporting the blade (504). The impeller frame (501) is provided with a magnetic sheet (505) for adsorbing the blade (504) on one side of the first positioning groove (502) and the second positioning groove (503). A grip bar (506) is provided at the end of the blade (504) adjacent to the inspection door (9).

5. The fire-fighting centrifugal fan according to claim 4, characterized in that: The bosses and magnetic pieces (505) in the first positioning groove (502) and the second positioning groove (503) are all located on one side of the first positioning groove (502) and the second positioning groove (503) pushing blade (504).

6. The fire-fighting centrifugal fan according to claim 1, characterized in that: A balance bar (6041) is provided on the side of the mounting base (603) away from the carrier bar (604), and the end of the balance bar (6041) away from the mounting base (603) is slidably connected to a groove on the outer wall of the housing (2).

7. The fire-fighting centrifugal fan according to claim 2, characterized in that: The end of the docking seat (706) is provided with a limiting ring (7061) located outside the friction ring (708).

8. The fire-fighting centrifugal fan according to claim 3, characterized in that: The lower end of the ash collection ring (607) is provided with an ash discharge port (6071).

9. The fire-fighting centrifugal fan according to claim 2, characterized in that: The controller (8) is electrically connected to the drive motor (3), the wind speed sensor (10) and the electromagnet (703) via wires.

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