Fire-fighting centrifugal fan

Abstract

The fire-fighting centrifugal fan comprises a base and a machine shell arranged on the base, a driving motor is arranged at one end of the interior of the machine shell, a mounting shaft penetrating through the machine shell is arranged at the output end of the driving motor, an impeller assembly is arranged on the portion, located in the machine shell, of the mounting shaft, and a filtering mechanism is arranged on the air inlet side of the machine shell; a butt joint assembly is connected between the filtering mechanism and the end of the mounting shaft, a controller is arranged at the lower end of the machine shell, an access door is arranged on the side, away from the air inlet, of the machine shell, and an air speed sensor is arranged at an air outlet in the upper end of the machine shell. The fire-fighting centrifugal fan is simple in structure and reasonable in design, an air inlet of the fire-fighting centrifugal fan is effectively filtered and protected through the multiple circular-ring-shaped filtering pieces, after blockage occurs, the scraping pieces are matched with the guide grooves, blockage on the surfaces of the filtering pieces and in the filtering pieces can be rapidly cleaned and dredged in the non-stop state, and the fire-fighting centrifugal fan is convenient to use. And it is guaranteed that the working process and the exhaust air rate of the fan are not affected.

Description

Technical Field

[0001] The invention relates to the technical field of centrifugal fan equipment, in particular to a fire-fighting centrifugal fan. Background Art

[0002] In today's society, with the acceleration of urbanization and the density of various types of buildings, fire safety has become an important part of the public safety field. As a key equipment in the fire protection system, the fire fan undertakes the important tasks of air supply and smoke exhaust in emergency situations such as fires, and plays an irreplaceable role in ensuring the evacuation of personnel and reducing property losses. The fire fan not only needs to have efficient and stable performance, but also needs to be able to adapt to various complex environments to ensure that it can be quickly started and continuously and stably operated in an emergency.

[0003] The traditional device has the following shortcomings: Existing fire fans are usually composed of basic components such as a casing, a drive motor, and an impeller assembly. The focus of their design is to ensure that they can provide sufficient air volume and air pressure in emergency situations. However, in order to ensure the efficient operation of the fan in emergency situations, most fire fans do not consider installing a filtering structure when designing. This is because the filtering structure is easily blocked by dust, debris, etc. during operation. Once blocked, it will seriously affect the ventilation efficiency of the fan and even cause the fan to fail to work properly. However, in the actual working process of the fire fan, due to the high air flow speed, foreign matter such as garbage and dust around it is often sucked into the fan. Once these foreign objects enter the fan, they are very likely to collide with the high-speed rotating impeller, causing damage to the blades, which in turn affects the working life and reliability of the fan. Therefore, traditional fire centrifugal fans can no longer meet the current complex environment. The demand for fire smoke exhaust or air supply. Summary of the invention

[0004] The object of the present invention is to provide a fire-fighting centrifugal fan to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solutions: a fire-fighting centrifugal fan, comprising a base and a casing arranged on the base, a driving motor is arranged at one end inside the casing, a mounting shaft penetrating the casing is arranged at the output end of the driving motor, an impeller assembly is arranged on the mounting shaft located inside the casing, a filter mechanism is arranged at the air inlet side of the casing, a docking assembly is connected between the filter mechanism and the end of the mounting shaft, a controller is arranged at the lower end of the casing, an inspection door is arranged at the side of the casing away from the air inlet, and a wind speed sensor is arranged at the air outlet at the upper end of the casing; The filtering mechanism comprises: A positioning frame, the positioning frame is arranged in a notch on the air inlet side of the housing, and a plurality of filter plates are arranged on the outer side of the positioning frame, the filter plates are in a circular ring shape and are concentrically arranged on the positioning frame; A mounting seat, the mounting seat being rotatably connected to one end of the through hole in the center of the positioning frame, a carrying bar being arranged on one side of the mounting seat, and an end of the carrying bar away from the mounting seat being slidably connected to a sliding groove on the outer wall of the housing; A scraper, which is arranged on one side of the carrier strip and between every two adjacent filter sheets, and is used to scrape off garbage on the surface of the filter sheets or embedded in the gaps between the filter sheets, and the end of the scraper is beveled; A guide groove is arranged on the end surface of the carrier strip and is used to guide the garbage scraped off by the scraper.

[0006] Preferably, the docking assembly includes: A square hole, wherein the square hole is opened on the inner side of the mounting seat, a square shaft is slidably connected in the square hole, and an electromagnet is arranged on the outer side of the square shaft on the end surface of the mounting seat; A friction plate, wherein the friction plate is arranged at one end of the square shaft away from the mounting seat, and a permanent magnet matching the electromagnet is arranged on the end surface of the friction plate and located outside the square shaft; A docking seat, the docking seat is arranged at the end of the mounting shaft, a plurality of positioning rods are arranged in an annular manner in the mounting groove on one side of the docking seat, the ends of the positioning rods are slidably connected with friction rings that can move horizontally, and a return spring is sleeved on the positioning rods; Two toothed discs are respectively arranged on one end surface of the friction plate and in the mounting groove on one side of the docking seat, the teeth of the two toothed discs match each other, and the friction ring is located outside the toothed disc on the docking seat and protrudes from the toothed disc.

[0007] Preferably, an ash collecting ring is provided on the outer wall of the casing outside the guide groove, and a receiving cover is provided at the end of the guide groove for guiding the garbage guided out of the guide groove into the ash collecting ring.

[0008] Preferably, the impeller assembly comprises: An impeller frame, the impeller frame is arranged on the mounting shaft and located inside the casing, a first positioning groove is provided on the circular ring on the air inlet side of the impeller frame, and a second positioning groove is provided through a side of the impeller frame adjacent to the inspection door; The blade is movably arranged at one end of the first positioning groove and the second positioning groove away from the mounting shaft, a boss for supporting the blade is provided in the first positioning groove and the second positioning groove, and a magnetic sheet for adsorbing the blade is provided on one side of the first positioning groove and the second positioning groove on the impeller frame; A grip bar is provided at one end of the blade adjacent to the inspection door.

[0009] Preferably, the bosses and the magnetic sheet in the first positioning groove and the second positioning groove are both located on one side of the first positioning groove and the second positioning groove pushing the blade.

[0010] Preferably, a balancing bar is provided on a side of the mounting seat away from the carrier bar, and one end of the balancing bar away from the mounting seat is slidably connected to a sliding groove on the outer wall of the casing.

[0011] Preferably, a limiting ring is provided at the end of the docking seat located outside the friction ring.

[0012] Preferably, an ash discharge port is provided at the lower end of the ash collecting ring.

[0013] Preferably, the controller is electrically connected to the drive motor, the wind speed sensor and the electromagnet respectively through wires.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention is provided with a filtering mechanism, and uses a plurality of annular filter plates to effectively filter and protect the air inlet of the fire-fighting centrifugal fan. After blockage occurs, the scraper blade cooperates with the guide groove to quickly clean and dredge the blockage on the surface and inside of the filter plate without stopping the machine, which not only provides effective protection for the internal structure and fan blades of the fire-fighting fan, but also ensures that the blockage will not affect the working process and exhaust volume of the fan during high-intensity or emergency exhaust operations, significantly improves the working efficiency and reliability of the fan, prolongs the working life, and better meets the fire-fighting smoke exhaust or air supply needs in the current complex environment; The present invention realizes the effect of using the power of the driving motor to drive the scraper blade to rotate by providing a docking assembly, and the magnetic force between the friction plate and the friction ring can be adjusted by controlling the magnitude of the current, thereby adjusting the torque and rotation speed of the scraper blade. At the same time, the friction plate and the friction ring can play a pre-acceleration effect before the two toothed discs are engaged, thereby avoiding a large impact caused by the excessive speed difference between the two toothed discs, and further extending the overall working life. The present invention is provided with an ash collecting ring and a receiving cover, so that the garbage collected in the guide groove is introduced into the ash collecting ring and discharged uniformly from the bottom, and will not be splashed into the external environment, thereby avoiding damage to nearby operators and the environment. At the same time, by setting the cross-sectional profile of the ash collecting ring, the garbage entering the ash collecting ring at a high speed can be effectively buffered, thereby avoiding high-speed impact on the shell of the ash collecting ring or internal splashing to cause damage; The present invention realizes that the blades are turned into independent units and movably arranged in the impeller frame by providing an impeller assembly, so that damaged blades can be quickly replaced individually, the operation is simple and efficient, and the maintenance convenience of the fan is significantly improved. Compared with the traditional centrifugal fan that can only replace the impeller as a whole, the maintenance cost is further reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1It is a first-view overall stereogram of the present invention; Figure 2 It is a second viewing angle overall stereogram of the present invention; Figure 3 It is a schematic diagram of the overall internal structure of the present invention; Figure 4 For the present invention Figure 3 An enlarged schematic diagram at A in FIG. Figure 5 For the present invention Figure 3 The enlarged schematic diagram at B in FIG. Figure 6 It is a three-dimensional schematic diagram of the carrier strip, scraper blade and guide groove of the present invention; Figure 7 It is a schematic diagram of the three-dimensional structure of the filtering mechanism of the present invention; Figure 8 It is a three-dimensional schematic diagram of the impeller assembly of the present invention; Fig. 9 It is a schematic diagram of the three-dimensional structure of the impeller frame of the present invention; Fig.10 It is a three-dimensional schematic diagram of a blade of the present invention; Fig.11 It is a schematic diagram of the connection structure between the blade and the impeller frame of the present invention.

[0016] In the figure: 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, grip bar; 6, filter mechanism; 601, positioning frame; 602, filter sheet; 603, mounting seat; 604, carrier bar; 6041, balance bar; 605, scraper; 606, guide groove ; 607, ash collecting ring; 6071, ash discharge port; 608, receiving cover; 7, docking assembly; 701, square hole; 702, square shaft; 703, electromagnet; 704, friction plate; 705, permanent magnet; 706, docking seat; 7061, limit ring; 707, positioning rod; 708, friction ring; 709, return spring; 710, two gear discs; 8, controller; 9, inspection door; 10, wind speed sensor. DETAILED DESCRIPTION

[0017] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0018] It should be noted that when an element is referred to as being "fixed", "mounted", "connected" or "disposed" with another element, it may be directly on the other element or indirectly on the other element. It should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present 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 operate in a specific orientation in the specification, and therefore cannot be understood as limiting the present invention.

[0019] As a further improvement of the present invention, the terms "first", "second", "third", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0020] See also Figure 1-11 As shown, the present invention provides a technical solution of a fire-fighting centrifugal fan: a fire-fighting centrifugal fan, comprising a base 1 and a casing 2 installed on the base 1, a driving motor 3 is installed at one end inside the casing 2 through a bracket, an output end of the driving motor 3 is connected to a mounting shaft 4 that penetrates the casing 2, an impeller assembly 5 is installed on the mounting shaft 4 located inside the casing 2, a filtering mechanism 6 is installed on the air inlet side of the casing 2 for blocking and removing garbage, a docking assembly 7 is connected between the filtering mechanism 6 and the end of the mounting shaft 4 for controlling the power output of the mounting shaft 4 to the filtering mechanism 6, a controller 8 is installed at the lower end of the casing 2, an inspection door 9 is provided on the side of the casing 2 away from the air inlet, and a wind speed sensor 10 is installed at the air outlet at the upper end of the casing 2 for judging the blocking condition of the air inlet by garbage; The filter mechanism 6 includes a positioning frame 601, a mounting seat 603, a scraper 605 and a guide groove 606. The positioning frame 601 is fixedly mounted in the notch on the air inlet side of the housing 2, and a plurality of circles of filter sheets 602 are fixedly mounted on the outer side of the positioning frame 601. The filter sheets 602 are in the shape of a ring and are concentrically sleeved on the positioning frame 601. The mounting seat 603 is rotatably connected to one end of the through hole in the center of the positioning frame 601, and a carrier strip 604 is fixedly connected to one side of the mounting seat 603, and the other side of the mounting seat 603 is connected to the docking assembly 7. The end of the carrier strip 604 away from the mounting seat 603 is slidably connected to the slide groove on the outer wall of the housing 2, and the carrier strip 604 can rotate on the surface of the filter sheet 602 and the positioning frame 601 with the mounting shaft 4 as the axis. The scraper 605 is installed on one side of the carrier strip 604 and is located between every two adjacent filters 602. Driven by the carrier strip 604, the scraper 605 rotates along the inner and outer walls of the filter 602 to scrape off the surface of the filter 602 or the garbage embedded in the gaps of the filter 602. The end of the scraper 605 is beveled. When the garbage between the gaps of the filter 602 is removed, the inclined surface of the scraper 605 first contacts the garbage. The garbage can be moved out of the gap along the inclined surface of the scraper 605 under the thrust of the scraper 605. The guide groove 606 is installed on the end surface of the carrier strip 604 to guide the garbage scraped off by the scraper 605 to prevent the garbage from being sucked back onto the filter 602 under the action of negative pressure. The windward side of the guide groove 606 is a slope to reduce wind resistance.

[0021] When the fire-fighting centrifugal fan is in operation, if the filter 602 is blocked by garbage, the wind speed sensor 10 will detect the wind speed reduction and send the data to the controller 8. The controller 8 controls the docking assembly 7 to output power to the mounting seat 603 through the mounting shaft 4, and the mounting seat 603 starts to drive the carrier bar 604 and each scraper 605 to rotate. The garbage stuck in the gap of the filter 602 is scooped up by the inclined surface of the scraper 605 when the scraper 605 passes by and is pushed out of the gap, and the garbage staying on the surface of the filter 602 is directly scooped up by the scraper 605 when the scraper 605 passes by. Then, these garbage passes through the carrier bar 604 and is caught by the synchronously rotating guide groove 606 at the rear. Since the guide groove 606 has centrifugal force during the rotation process, the garbage will slide out along the inner wall of the guide groove 606 and will not accumulate in the guide groove 606. When the controller 8 determines that the wind speed has recovered through the wind speed sensor 10, it can control the power input of the mounting seat 603 to be disconnected. At this time, the cleaning function of the fire-fighting centrifugal fan is turned off. During the entire unblocking and cleaning process, the normal exhaust or air supply work of the fire-fighting fan will not be affected.

[0022] Through the filtering mechanism 6, a plurality of annular filter plates 602 are utilized to effectively filter and protect the air inlet of the fire-fighting centrifugal fan. When blockage occurs, the scraper blade 605 cooperates with the guide groove 606 to quickly clean and dredge the blockage on the surface and inside of the filter plate 602 without stopping the machine. This not only provides effective protection for the internal structure and blades of the fire-fighting fan, but also ensures that blockage during high-intensity or emergency exhaust operations will not affect the working progress of the fan, significantly improving the working efficiency and reliability of the fan, extending its working life, and better meeting the needs of fire smoke exhaust or air supply in the current complex environment.

[0023] The docking assembly 7 includes a square hole 701, a friction plate 704, a docking seat 706 and two toothed discs 710. The square hole 701 is opened on the inner side of the mounting seat 603, and a square shaft 702 is slidably connected in the square hole 701. An electromagnet 703 is fixedly installed on the end surface of the mounting seat 603 and located outside the square shaft 702. The friction plate 704 is installed on the end of the square shaft 702 away from the mounting seat 603, and a permanent magnet 705 matching the electromagnet 703 is installed on the end surface of the friction plate 704 and located outside the square shaft 702. The horizontal movement of the friction plate 704 is controlled by the attraction and repulsion of the electromagnet 703 on the permanent magnet 705. The greater the current passing through the electromagnet 703, the greater the attraction and repulsion. The docking seat 706 is integrally formed and processed and arranged at the end of the installation shaft 4. A plurality of positioning rods 707 are annularly installed in the installation groove on one side of the docking seat 706. The end of the positioning rod 707 is slidably connected to a friction ring 708 that can move horizontally. A return spring 709 is sleeved on the positioning rod 707 to push the friction ring 708 outward. Two toothed discs 710 are respectively fixedly installed on one end surface of the friction plate 704 and in the installation groove on one side of the docking seat 706. The teeth of the two toothed discs 710 match 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.

[0024] When it is necessary to output power to the mounting seat 603 through the mounting shaft 4, the controller 8 controls the electromagnet 703 to be energized 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 seat 603 to rotate through the friction force, the filtering 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 torsion of the scraper 605 increases, the speed increases, and the friction ring 708 overcomes the elastic force of the return spring 709 and is squeezed to the inside of the docking seat 706 until the two toothed discs 710 on both sides engage and dock. At this time, the speed of the mounting seat 603 is synchronized with the mounting shaft 4, and the scraper 605 reaches the fastest speed. In actual application, the current passing through the electromagnet 703 can be adjusted and set by the controller 8 according to the rotation speed requirement of the scraper 605 or the stubbornness of the garbage adhesion.

[0025] By docking the assembly 7, the effect of utilizing the power of the driving motor 3 to drive the scraper 605 to rotate is achieved. 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 rotation speed of the scraper 605. At the same time, before the two toothed discs 710 engage, the friction plate 704 and the friction ring 708 can have a pre-acceleration effect, thereby avoiding a large impact between the two toothed discs 710 due to an excessively large speed difference, thereby further extending the overall working life.

[0026] An ash collecting ring 607 is installed on the outer wall of the housing 2 outside the guide groove 606. A receiving cover 608 is integrally formed at the end of the guide groove 606 to guide the garbage discharged from the guide groove 606 into the ash collecting ring 607. An ash discharge port 6071 is provided at the lower end of the ash collecting ring 607. The cross-sectional profile of the ash collecting ring 607 is as follows: Figure 4 As shown, the garbage is guided by the guide groove 606 using centrifugal force and then enters the ash collecting ring 607 through the guidance of the guide cover 608. It first slides along the inner wall of the outer ring of the ash collecting ring 607 until it slides into the inner ring, and the kinetic energy is buffered. Then, under the action of gravity, it slides along the inner wall of the inner ring of the ash collecting ring 607, and finally falls and is discharged from the ash discharge port 6071 below. Through the ash collecting ring 607 and the guide cover 608, the garbage collected by the guide groove 606 is introduced into the ash collecting ring 607 and uniformly discharged from the bottom, so that it will not splash into the external environment, avoiding damage to nearby operators and the environment. At the same time, by setting the cross-sectional profile of the ash collecting ring 607, the garbage entering the ash collecting ring 607 at high speed can be effectively buffered, avoiding high-speed impact on the shell of the ash collecting ring 607 or internal splashing to cause damage.

[0027] The impeller assembly 5 includes an impeller frame 501, blades 504 and a grip bar 506. The impeller frame 501 is fixedly mounted on the mounting shaft 4 and is located inside the housing 2. Ball grooves are provided on the outer side of the impeller frame 501 and the inner wall of the housing 2. The ball sliding connection improves the stability of the impeller frame 501 during rotation and avoids collisions between the two during operation. A first positioning groove 502 is provided on the circular ring on the air inlet side of the impeller frame 501, and 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 mounted at one end of the first positioning groove 502 and the second positioning groove 503 away from the mounting shaft 4. A boss for supporting the blade 504 is provided in the first positioning groove 502 and the second positioning groove 503. A magnetic sheet 505 for adsorbing the blade 504 is provided on one side of the first positioning groove 502 and the second positioning groove 503 on the impeller frame 501. If the blade 504 is made of a non-magnetic material, it is necessary to add a layer of magnetic sheet 505 on the side wall of the blade 504. The blade 504 is fixed by the support of the boss in the first positioning groove 502 and the second positioning groove 503 and the adsorption of the magnetic sheet 505. The boss and the magnetic sheet 505 in the first positioning groove 502 and the second positioning groove 503 are both located on the side of the first positioning groove 502 and the second positioning groove 503 that push the blade 504, so as to ensure the dynamic and static stability between the blade 504 and the impeller frame 501. The grip bar 506 is installed at one end of the blade 504 adjacent to the inspection door 9.

[0028] When blade 504 is damaged and needs to be replaced, the staff can manually open the inspection door 9, grasp the grip bar 506 and push it in the direction away from the magnetic sheet 505 until blade 504 overcomes the attraction of the magnetic sheet 505 and moves to the side of the first positioning groove 502 and the second positioning groove 503 without the boss, and then move the blade 504 downward along the first positioning groove 502 and the second positioning groove 503 until the blade 504 is free from the limit of the side wall of the second positioning groove 503 and can move axially horizontally, and then can be directly pulled out from the inspection door 9.

[0029] Through the impeller assembly 5, the blades 504 are transformed into independent units and movably arranged in the impeller frame 501. Damaged blades 504 can be quickly replaced individually. The operation is simple and efficient, which significantly improves the maintenance convenience of the fan and further reduces the maintenance cost compared with the traditional centrifugal fan that can only replace the impeller as a whole.

[0030] A balancing bar 6041 is installed on the side of the mounting seat 603 away from the carrier bar 604. The end of the balancing bar 6041 away from the mounting seat 603 is slidably connected to the sliding groove on the outer wall of the casing 2. The mass of the balancing bar 6041 should be close to the sum of the masses of the carrier bar 604, the scraper 605 and the guide groove 606 due to the selection of materials. 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 seat 603. The balancing bar 6041 can balance the centrifugal force to ensure the stability of the filter mechanism 6 during operation.

[0031] The end of the docking seat 706 is located outside the friction ring 708 and is provided with a limit ring 7061 . The cross section of the limit ring 7061 is an inclined surface to prevent the friction plate 704 from tilting during horizontal axial movement, affecting friction and the meshing and docking of the two toothed discs 710 .

[0032] The controller 8 is electrically connected to the driving motor 3 , the wind speed sensor 10 and the electromagnet 703 respectively through wires.

[0033] Working principle: When the fire-fighting centrifugal fan is in operation, if the filter 602 is blocked by garbage, 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 be energized 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. The mounting seat 603 starts to drive the carrier bar 604 and each scraper 605 to rotate. Then the controller 8 sets the current size according to the wind speed and gradually controls the increase of the current to reach the set value. The garbage stuck in the gap of the filter 602 is scooped up by the inclined surface of the scraper 605 and pushed out of the gap when the scraper 605 passes by, and the garbage staying on the surface of the filter 602 is directly scooped up by the scraper 605 when the scraper 605 passes by. Then, these garbage are caught by the synchronously rotating guide groove 606 behind through the carrier bar 604. Since the guide groove 606 has centrifugal force during the rotation process, the garbage will slide out along the inner wall of the guide groove 606, and enter the ash collecting ring 607 under the guidance of the receiving cover 608, first sliding along the inner wall of the outer ring of the ash collecting ring 607, until it slides into the inner ring, and the kinetic energy is buffered. Then, under the action of gravity, it slides down along the inner wall of the inner ring of the ash collecting ring 607, and finally falls and is discharged from the ash discharge port 6071 below. When the controller 8 determines that the wind speed has recovered through the wind speed sensor 10, it controls to disconnect the power input of the mounting seat 603, and the cleaning function of the fire fighting centrifugal fan is turned off at this time. During the entire unblocking and cleaning process, the normal exhaust or air supply work of the fire-fighting fan will not be affected.

[0034] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fire-fighting centrifugal fan, comprising a base (1) and a casing (2) arranged on the base (1), characterized in that: A drive motor (3) is arranged at one end inside the casing (2); a mounting shaft (4) penetrating the casing (2) is arranged at the output end of the drive motor (3); an impeller assembly (5) is arranged on the mounting shaft (4) and located inside the casing (2); a filter mechanism (6) is arranged on the air inlet side of the casing (2); a docking assembly (7) is connected between the filter mechanism (6) and the end of the mounting shaft (4); a controller (8) is arranged at the lower end of the casing (2); an inspection door (9) is arranged on the side of the casing (2) away from the air inlet; and a wind speed sensor (10) is arranged at the air outlet at the upper end of the casing (2); The filtering mechanism (6) comprises: A positioning frame (601), the positioning frame (601) being arranged in a notch on the air inlet side of the housing (2), a plurality of rings of filter sheets (602) being arranged on the outside of the positioning frame (601), the filter sheets (602) being in a circular ring shape and being concentrically arranged on the positioning frame (601); A mounting seat (603), the mounting seat (603) being rotatably connected to one end of a through hole in the center of the positioning frame (601), a carrying bar (604) being provided on one side of the mounting seat (603), and an end of the carrying bar (604) away from the mounting seat (603) being slidably connected to a sliding groove on the outer wall of the housing (2); a scraper (605), the scraper (605) being arranged on one side of the carrier strip (604) and being located between every two adjacent filter sheets (602), the scraper (605) being used to scrape away garbage on the surface of the filter sheets (602) or embedded in the gaps between the filter sheets (602), the end of the scraper (605) being beveled; A guide groove (606) is provided on the end surface of the carrier strip (604) and is used to guide out the garbage scraped off by the scraper (605).

2. The fire-fighting centrifugal fan according to claim 1, characterized in that: The docking assembly (7) comprises: A square hole (701), the square hole (701) being opened on the inner side of the mounting seat (603), a square shaft (702) being slidably connected in the square hole (701), and an electromagnet (703) being arranged on the outer side of the square shaft (702) on the end surface of the mounting seat (603); A friction plate (704), the friction plate (704) being arranged at one end of the square shaft (702) away from the mounting seat (603), and a permanent magnet (705) matching the electromagnet (703) being arranged on the end surface of the friction plate (704) and located outside the square shaft (702); A docking seat (706), the docking seat (706) being arranged at the end of the mounting shaft (4), a plurality of positioning rods (707) being arranged in an annular shape in the mounting groove on one side of the docking seat (706), the ends of the positioning rods (707) being slidably connected to friction rings (708) that can move horizontally, and a return spring (709) being sleeved on the positioning rods (707); Two toothed discs (710), the two toothed discs (710) are respectively arranged on one end surface of the friction plate (704) and in a mounting groove on one side of the docking seat (706), the teeth of the two toothed discs (710) match each other, and 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: An ash collecting 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) for guiding the garbage guided out of the guide groove (606) into the ash collecting ring (607).

4. The fire-fighting centrifugal fan according to claim 1, characterized in that: The impeller assembly (5) comprises: An impeller frame (501), the impeller frame (501) being arranged on the mounting shaft (4) and located inside the casing (2), a first positioning groove (502) being provided on a circular ring on the air inlet side of the impeller frame (501), and a second positioning groove (503) being provided through a side of the impeller frame (501) adjacent to the inspection door (9); a blade (504), the blade (504) being movably arranged at one end of the first positioning groove (502) and the second positioning groove (503) away from the mounting shaft (4), a boss for supporting the blade (504) being provided in the first positioning groove (502) and the second positioning groove (503), and a magnetic sheet (505) for adsorbing the blade (504) being provided on one side of the first positioning groove (502) and the second positioning groove (503) on the impeller frame (501); A gripping strip (506) is provided at one 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 the magnetic sheet (505) in the first positioning groove (502) and the second positioning groove (503) are both located on one side of the first positioning groove (502) and the second positioning groove (503) that push the blade (504).

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

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

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

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) respectively through wires.

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