Centrifugal fan for fire ventilation

Abstract

The application discloses a centrifugal fan for fire-fighting ventilation and relates to the field of centrifugal fans.The centrifugal fan for fire-fighting ventilation is characterized in that the groove of the connecting disc is matched with the cavity of the cavity disc, the cavity structure formed between the groove of the connecting disc and the cavity disc is utilized in the smoke guiding space, the cavity structure of the cavity disc itself is matched, a double cavity is formed, the cavity is utilized to block the heat in the smoke, the transmission amount of the smoke heat to the motor is reduced, the heat contained in the fire smoke is prevented from being transmitted to the motor when the smoke is discharged, the motor temperature is prevented from being overheated, the motor is prevented from being damaged, the smoke discharging work can be continuously carried out, the smoke is rotated by the outer leaf plate close to the inner wall of the cavity cylinder, the rotation speed of the smoke at the scraping position is ensured, the rotation speed of the smoke at the scraping position is prevented from being low, the scraped adhered smoke dust particles are prevented from being unable to be driven, the smoke dust particles are prevented from falling and piling up, and the piling up and blockage in the fan are prevented.

Description

Technical Field

[0001] This invention specifically relates to a centrifugal fan for fire ventilation, and pertains to the field of centrifugal fans. Background Technology

[0002] Centrifugal fans are specifically designed for building fire smoke extraction, positive pressure air supply, and ventilation. They are fire-fighting fans and must meet national fire protection standards and fire resistance requirements. Their core function is to extract smoke and supply air to ensure personnel evacuation during a fire, and they can also be used for ventilation during normal times.

[0003] The public account number is: CN119844402B A centrifugal fire-fighting smoke exhaust fan includes a base, a fan, and further includes: an air inlet duct, a filter mechanism, a spray mechanism, a mixing mechanism, and a water removal mechanism. This invention utilizes the combined use of the filter and spray mechanisms. When the centrifugal fire-fighting fan is working, the filter mechanism filters the smoke entering the air inlet duct, blocking dust particles in the smoke. During operation, the spray mechanism allows clean water to circulate within the heat exchange tubes of the filter mechanism, absorbing the temperature of the smoke and reducing the probability of impeller corrosion. The clean water, after absorbing the smoke temperature, is then sprayed into the smoke through the spray mechanism. Because the clean water is warm, its atomization efficiency is higher, allowing the atomized clean water to more comprehensively absorb pollutants in the smoke, further reducing the probability of impeller corrosion and effectively protecting the environment.

[0004] In existing equipment, when guiding smoke during fire fighting to improve visibility at the fire scene, the smoke temperature is high. After entering the centrifugal fan, the heat of the smoke is continuously transferred to the internal components of the centrifugal fan during the process of being guided. When the heat is transferred to the motor, the high temperature can easily damage the motor and prevent it from performing smoke exhaust work. At the same time, the power consumption of the motor usually increases under high temperature conditions. Summary of the Invention

[0005] To address the aforementioned problems, a technical solution is proposed: a centrifugal fan for fire ventilation, comprising:

[0006] An air chamber mechanism is provided, with a base fixedly installed at the bottom, a motor fixedly installed on one side, an air intake mechanism fixedly installed on the other side, an exhaust pipe fixedly installed at the top, and a fan wheel mechanism rotatably installed inside the air chamber mechanism.

[0007] The fan wheel mechanism includes a cavity disk with an annular groove on its outer side and a cavity inside. A connecting plate is fixedly installed on the side of the cavity disk away from the motor, and a groove is formed on the side of the connecting plate near the cavity disk. The connecting plate and the cavity disk form a cavity through the groove. By utilizing the cavity structure formed between the groove of the connecting plate and the cavity disk in the flue gas guiding space, a double cavity is formed in conjunction with the cavity structure of the cavity disk itself. The cavity is used to block heat from the smoke, reducing the amount of heat transferred from the smoke to the motor. This prevents the heat contained in the smoke from being transferred to the motor during smoke exhaust, which could cause the motor to overheat, damage it, and prevent it from continuing to exhaust smoke. An impeller is fixedly installed on the side of the connecting plate away from the cavity plate, and an inner blade is fixedly installed on the side of the impeller away from the connecting plate. The inner blades are evenly installed along the center of the impeller, and the width of the inner blades gradually increases as they move away from the center of the impeller.

[0008] Preferably, an outer blade is fixedly installed on the side of the impeller disk away from the connecting disk. The outer blades are evenly installed around the center of the impeller disk, and are located outside the inner blades. A fixing ring is fixedly installed on the outer side of the impeller disk, and is located outside the outer blades. An inner scraper is fixedly installed outside the fixing ring. The inner scraper cooperates with the outer blades. When the inner scraper scrapes the dust particles adhering to the inner wall of the cavity, the dust particles fall off and are driven by the rotating flue gas. At this time, the outer blades drive the flue gas close to the inner wall of the cavity to rotate. The rotation speed of the flue gas at the scraping position is ensured to prevent it from being too slow and unable to carry the scraped-off dust particles, which would cause the dust particles to fall and accumulate, resulting in blockage inside the fan. An inner support ring is fixedly installed on the side of the inner scraper away from the fixed ring, and the side of the inner support ring away from the inner scraper is in contact with the inner wall of the air cavity mechanism. A side ring plate is fixedly installed on the side of the cavity disk near the motor, and a side blade plate is fixedly installed on the side of the side ring plate away from the cavity disk. The side blade plates are evenly installed along the center position of the side ring plate, and the outer side of the side ring plate is in contact with the inner wall of the air cavity mechanism.

[0009] Preferably, the air cavity mechanism includes a cavity cylinder, which is a double-layer shell structure. An inner arc groove and an outer arc groove are formed on the side of the cavity cylinder near the motor. A support cylinder is fixedly installed on the side of the cavity cylinder near the motor. The inner arc groove is located inside the support cylinder, and the outer arc groove is located outside the support cylinder. The end of the support cylinder away from the cavity cylinder is fixedly connected to the motor. The output end of the motor is fixedly connected to a drive shaft via a coupling. A bearing is fixedly installed on the outer side of the drive shaft. The drive shaft is rotatably connected to the inner wall of the cavity cylinder via the bearing. The end of the drive shaft away from the motor is fixedly connected to the outer side of the cavity disc. An outer ring cover is fixedly installed at the outer arc groove of the cavity cylinder. The rotation of the side ring plate and the side blade plate allows external air to pass through... Air passes through the outer ring cover and is filtered by the filter holes of the outer ring cover. Then, the air passes through the outer arc groove and enters the cavity cylinder. Driven by the side blades, the air that has entered the cavity is once again discharged through the inner arc groove. At the same time, during the discharge, the internal heat of the cavity cylinder is carried away, forming a cooling space between the motor and the flue gas guiding space, so as to prevent the heat of the flue gas from affecting the operation of the motor. The side of the outer ring cover away from the cavity cylinder is a centrally protruding arc surface, and filter holes are evenly opened on the outer side of the outer ring cover. An inner convex ring is fixedly installed on the inner wall of the cavity cylinder. The inner wall of the inner convex ring is evenly opened with column grooves, and an inner rotating block is rotatably installed at the column groove of the inner convex ring. The inner convex ring is rotatably adapted to the annular groove of the cavity disk through the inner rotating block.

[0010] Preferably, the air intake mechanism includes an air intake cylinder, one end of which is fixedly connected to the outside of the cavity cylinder. The end of the air intake cylinder away from the cavity cylinder is a cone with an outer diameter that gradually increases as it moves away from the cavity cylinder. A retaining ring is fixedly installed on the inner wall of the air intake cylinder at the end away from the cavity cylinder. A grid cover is fixedly installed on the inner wall of the retaining ring. Grid columns are evenly arranged inside the grid cover, and grid grooves are formed between the grid columns. A fixing cover is fixedly installed on the inner wall of the air intake cylinder. An inner sliding ring is slidably installed between the fixing cover and the air intake cylinder. A through-groove cylinder is fixedly installed on one side of the inner sliding ring. The side of the through-groove cylinder near the grid cover is convex. The raised arc surface of the channel tube near the grille cover, combined with the evenly spaced arc grooves on the arc surface, guides the filtered foreign objects in the smoke during filtration. Simultaneously, the subsequent smoke provides a pushing force to the filtered foreign objects, moving them away from the arc grooves of the channel tube. This prevents accumulation and blockage at the arc grooves, thus avoiding obstruction of the smoke entry path and preventing smoke from being expelled in the event of a fire, thereby improving visibility. Furthermore, the evenly spaced arc grooves on the arc surface are complemented by an inner ring gasket fixed between the other side of the inner slip ring and the inner wall of the fixed cover. The inner ring gasket is made of elastic material.

[0011] This invention provides a centrifugal fan for fire ventilation, which has the following beneficial effects:

[0012] (i) By using the groove of the connecting plate and the cavity of the cavity plate to cooperate, a double cavity is formed in the smoke guiding space by utilizing the cavity structure formed between the groove of the connecting plate and the cavity plate, in conjunction with the cavity structure of the cavity plate itself. The cavity is used to block the heat in the smoke, reduce the amount of heat transferred from the smoke to the motor, and prevent the heat contained in the fire smoke from being transferred to the motor when the smoke is discharged, which would cause the motor to overheat, damage the motor, and prevent it from continuing to perform smoke discharge work.

[0013] (ii) By cooperating with the inner scraper and the outer blade, when the inner scraper scrapes the dust particles attached to the inner wall of the cavity, the dust particles are detached and driven by the rotating flue gas. At this time, the outer blade drives the flue gas close to the inner wall of the cavity to rotate, ensuring the rotation speed of the flue gas at the scraping position. This avoids the flue gas at the scraping position being too slow to carry the scraped dust particles, which would cause the dust particles to fall and accumulate, causing blockage inside the fan.

[0014] (III) By rotating the side ring plate and the side blade plate, the outside air passes through the outer ring cover and is filtered by the filter holes of the outer ring cover. Then the air passes through the outer arc groove and enters the cavity cylinder. Under the action of the side blade plate, the air that has entered the cavity cylinder is once again discharged from the inner arc groove. At the same time, the heat inside the cavity cylinder is carried away during discharge, forming a cooling space between the motor and the flue gas guiding space, so as to prevent the heat of the flue gas from affecting the operation of the motor.

[0015] (iv) By utilizing the raised arc surface of the through-channel cylinder near the grid cover, and the evenly spaced arc through-channels on the arc surface, when filtering foreign objects in the smoke, the raised arc surface guides the filtered foreign objects. At the same time, the subsequent smoke provides a pushing force for the filtered foreign objects, causing them to move away from the arc through-channel position of the through-channel cylinder, avoiding accumulation and blockage at the arc through-channel position, blocking the smoke entry path, and preventing the smoke from being discharged in the event of a fire, thus improving visibility. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 This is a cross-sectional view of the overall structure of the present invention;

[0018] Figure 3 This is a sectional view of the air cavity mechanism of the present invention;

[0019] Figure 4 This is a sectional side view of the air cavity mechanism of the present invention;

[0020] Figure 5 This is a schematic diagram of the intake mechanism of the present invention;

[0021] Figure 6This is a sectional view of the intake mechanism of the present invention;

[0022] Figure 7 This is a schematic diagram of the fan wheel mechanism of the present invention;

[0023] Figure 8 This is a partial structural cross-sectional view of the fan wheel mechanism of the present invention.

[0024] In the diagram: 1. Base; 2. Air chamber mechanism; 3. Air intake mechanism; 4. Fan wheel mechanism; 5. Motor; 6. Exhaust pipe; 21. Cavity cylinder; 22. Inner rotating block; 23. Inner convex ring; 24. Drive shaft; 25. Bearing; 26. Support cylinder; 27. Outer ring cover; 31. Air intake cylinder; 32. Slotted ring; 33. Grille cover; 34. Through slot cylinder; 35. Fixing cover; 36. Inner ring gasket; 37. Inner slip ring; 401. Impeller disk; 402. Inner support ring; 403. Inner scraper; 404. Outer blade; 405. Inner blade; 406. Connecting disk; 407. Fixing ring; 408. Cavity disk; 409. Side ring plate; 410. Side blade. Detailed Implementation

[0025] Example 1, Reference Figures 1 to 2 and Figures 7 to 8 The present invention provides the following technical solution:

[0026] A centrifugal fan for fire ventilation, comprising:

[0027] Air chamber mechanism 2, base 1 is fixedly installed at the bottom of air chamber mechanism 2, motor 5 is fixedly installed on one side of air chamber mechanism 2, and air intake mechanism 3 is fixedly installed on the other side of air chamber mechanism 2. Exhaust pipe 6 is fixedly installed at the top of air chamber mechanism 2. Fan wheel mechanism 4 is rotatably installed inside air chamber mechanism 2.

[0028] The fan wheel mechanism 4 includes a cavity disk 408. An annular groove is formed on the outer side of the cavity disk 408, and a cavity is formed inside the cavity disk 408. A connecting disk 406 is fixedly installed on the side of the cavity disk 408 away from the motor 5. A groove is formed on the side of the connecting disk 406 near the cavity disk 408, and a cavity is formed between the connecting disk 406 and the cavity disk 408 through the groove. An impeller disk 401 is fixedly installed on the side of the connecting disk 406 away from the cavity disk 408. The motor 5 drives the cavity disk 408 to rotate via the transmission shaft 24. The cavity disk 408 drives the impeller disk 401 to rotate via the connecting disk 406. During the rotation of the impeller disk 401, the inner blade plate 405, the outer blade plate 404, and the fixed ring are driven to rotate. As 407 rotates, the inner blade 405 and outer blade 404 rotate. The inner blade 405, with its inclined installation and gradually increasing blade width as it moves away from the center of the impeller disk 401, drives the flue gas inside the gas chamber mechanism 2, causing it to generate centrifugal force and spread outwards. During this outward spread, the outer blade 404, which rotates at an inclined installation, drives the flue gas again, increasing the pressure on the inner wall of the gas chamber mechanism 2, causing the flue gas to be discharged from the exhaust pipe 6. The inner blade 405 is fixedly installed on the side of the impeller disk 401 away from the connecting plate 406. The inner blade 405 is evenly installed along the center of the impeller disk 401, and its width gradually increases as it moves away from the center of the impeller disk 401.

[0029] An outer blade 404 is fixedly installed on the side of the impeller disk 401 away from the connecting disk 406. The outer blades 404 are evenly installed around the center of the impeller disk 401, and are located outside the inner blade 405. A fixing ring 407 is fixedly installed on the outside of the impeller disk 401, located outside the outer blade 404. An inner scraper 403 is fixedly installed on the outside of the fixing ring 407. An inner support ring 402 is fixedly installed on the side of the inner scraper 403 away from the fixing ring 407. The side of the inner support ring 402 away from the inner scraper 403 is in contact with the inner wall of the air chamber mechanism 2. During the rotation of the fixing ring 407, the inner scraper 403 and the inner support ring 402 are driven to rotate, causing the inner support ring 402 and the inner scraper 403 to rotate inside the air chamber mechanism 2. During the rotation, the inner scraper 403... The dust adhering to the inner wall of the air chamber mechanism 2 is scraped and cleaned, and then carried out by the flue gas along the exhaust pipe 6. At the same time, as the cavity disk 408 rotates, the side ring plate 409 rotates through the cavity disk 408. During the rotation, the side blade plate 410 drives the outside air of the cavity cylinder 21 to pass through the outer ring cover 27 and enter the interior of the cavity cylinder 21 through the outer arc groove. Driven by the rotation of the side blade plate 410, the air moves closer to the center position and is then discharged through the inner arc groove. An air circulation is formed in the space between the side ring plate 409 and the cavity cylinder 21. The side ring plate 409 is fixedly installed on the side of the cavity disk 408 near the motor 5, and the side blade plate 410 is fixedly installed on the side of the side ring plate 409 away from the cavity disk 408. The side blade plates 410 are evenly installed along the center position of the side ring plate 409, and the outer side of the side ring plate 409 is in contact with the inner wall of the air chamber mechanism 2.

[0030] Example 2, based on Example 1, with reference to Figures 3 to 4The air cavity mechanism 2 includes a cavity cylinder 21, which has a double-layer shell structure. An inner arc groove and an outer arc groove are formed on the side of the cavity cylinder 21 closest to the motor 5. A support cylinder 26 is fixedly installed on the side of the cavity cylinder 21 closest to the motor 5. The inner arc groove is located inside the support cylinder 26, and the outer arc groove is located outside the support cylinder 26. The end of the support cylinder 26 away from the cavity cylinder 21 is fixedly connected to the motor 5. The output end of the motor 5 is fixedly connected to a drive shaft 24 via a coupling. A bearing 25 is fixedly installed on the outer side of the drive shaft 24, and the drive shaft 24 is rotatably connected to the inner wall of the cavity cylinder 21 via the bearing 25. The end of the drive shaft 24 away from the motor 5 is fixedly connected to the outer side of the cavity disk 408. An outer ring cover 27 is fixedly installed at the outer arc groove of the cavity cylinder 21. The side of the outer ring cover 27 away from the cavity cylinder 21 has a centrally protruding arc surface. Furthermore, filter holes are evenly provided on the outer side of the outer ring cover 27. The output end of the motor 5 is fixedly connected to the transmission shaft 24 through a coupling, and the other end of the transmission shaft 24 is fixedly connected to the fan wheel mechanism 4 to drive the fan wheel mechanism 4 to rotate. At the same time, during the rotation of the fan wheel mechanism 4, the cavity cylinder 21 draws in flue gas through the air intake mechanism 3, allowing the flue gas to enter the interior of the cavity cylinder 21. Subsequently, under the drive of the fan wheel mechanism 4, it is discharged through the exhaust pipe 6. At the same time, the cavity formed by the double-layer shell structure of the cavity cylinder 21 forms a heat insulation layer, reducing the heat transfer in the flue gas to the shell surface. An inner convex ring 23 is fixedly installed on the inner wall of the cavity cylinder 21. The inner wall of the inner convex ring 23 is evenly provided with column grooves, and an inner rotating block 22 is rotatably installed at the column groove of the inner convex ring 23. The inner convex ring 23 is rotatably adapted to the ring groove of the cavity disk 408 through the inner rotating block 22.

[0031] Example 3, based on Examples 1 and 2, with reference to Figures 5 to 6The intake mechanism 3 includes an intake cylinder 31. One end of the intake cylinder 31 is fixedly connected to the outside of the cavity cylinder 21. The end of the intake cylinder 31 away from the cavity cylinder 21 is a cone with an outer diameter that gradually increases as it moves away from the cavity cylinder 21. A retaining ring 32 is fixedly installed on the inner wall of the intake cylinder 31 at the end away from the cavity cylinder 21. When the inhaled flue gas enters the intake cylinder 31, it first passes through the grille cover 33 and is filtered by the grille grooves formed between the grille columns, so that large foreign objects in the inhaled flue gas are blocked by the grille columns. The grille cover 33 is fixedly installed on the inner wall of the retaining ring 32. The grille cover 33 has grille columns evenly arranged inside, and grille grooves are formed between the grille columns. A retaining ring 32 is fixedly installed on the inner wall of the intake cylinder 31. A fixed cover 35 is slidably installed between the fixed cover 35 and the air inlet cylinder 31. A through groove cylinder 34 is fixedly installed on one side of the inner slip ring 37. The side of the through groove cylinder 34 near the grille cover 33 is a raised arc surface, and arc grooves are evenly opened on the arc surface. After passing through the grille cover 33, the flue gas is guided by the conical position of the air inlet cylinder 31, so that it moves towards the arc groove position of the through groove cylinder 34. The flue gas is filtered again through the arc groove of the through groove cylinder 34. The filtered flue gas enters the interior of the through groove cylinder 34, and then enters the interior of the air chamber mechanism 2 through the air inlet cylinder 31. An inner ring pad 36 is fixedly installed between the other side of the inner slip ring 37 and the inner wall of the fixed cover 35. The inner ring pad 36 is made of elastic material.

[0032] When a fire occurs and smoke needs to be vented outwards, the motor 5 is started, causing the fan wheel mechanism 4 to rotate inside the air chamber mechanism 2. This allows the smoke to be drawn into the air chamber mechanism 2 through the air intake mechanism 3 and then discharged through the exhaust pipe 6 under the drive of the fan wheel mechanism 4. During fire rescue operations, this process vents the smoke and improves visibility.

[0033] In the air cavity mechanism 2, the output end of the motor 5 is fixedly connected to the transmission shaft 24 through a coupling, and the other end of the transmission shaft 24 is fixedly connected to the fan wheel mechanism 4 to drive the fan wheel mechanism 4 to rotate. At the same time, during the rotation of the fan wheel mechanism 4, the cavity cylinder 21 draws in flue gas through the air intake mechanism 3, so that the flue gas enters the interior of the cavity cylinder 21. Then, driven by the fan wheel mechanism 4, it is discharged through the exhaust pipe 6. At the same time, the cavity formed by the double shell structure of the cavity cylinder 21 forms a heat insulation layer, reducing the heat transfer in the flue gas to the shell surface.

[0034] In the fan wheel mechanism 4, the motor 5 drives the cavity disk 408 to rotate via the transmission shaft 24. The cavity disk 408 drives the impeller disk 401 to rotate via the connecting disk 406. During the rotation of the impeller disk 401, the inner blade 405, outer blade 404, and fixed ring 407 rotate. During the rotation of the inner blade 405 and outer blade 404, the inner blade 405, with its inclined installation and gradually increasing blade width as it moves away from the center of the impeller disk 401, drives the flue gas inside the air chamber mechanism 2, causing it to generate centrifugal force and diffuse outwards. During this diffusion, the inclined rotating outer blade 404 further drives the flue gas, increasing the pressure on the inner wall of the air chamber mechanism 2, causing the flue gas to be discharged through the exhaust pipe 6. During the rotation of the fixed ring 407... In the process, the inner scraper 403 and the inner support ring 402 rotate, causing the inner support ring 402 and the inner scraper 403 to rotate inside the air cavity mechanism 2. During the rotation, the inner scraper 403 scrapes and cleans the dust adhering to the inner wall of the air cavity mechanism 2, causing it to be carried out by the flue gas along the exhaust pipe 6. At the same time, as the cavity disk 408 rotates, it drives the side ring plate 409 to rotate. During the rotation, the side blade plate 410 drives the outside air of the cavity cylinder 21 to pass through the outer ring cover 27, enter the cavity cylinder 21 through the outer arc groove, and move towards the center position under the drive of the rotating side blade plate 410. Then it is discharged through the inner arc groove, forming an air circulation flow in the space between the side ring plate 409 and the cavity cylinder 21.

[0035] In the intake mechanism 3, when the inhaled flue gas enters the intake cylinder 31, it first passes through the grille cover 33 and is filtered by the grille groove formed between the grille columns. Large foreign objects in the inhaled flue gas are blocked by the grille columns. After passing through the grille cover 33, the flue gas is guided by the conical position of the intake cylinder 31 and moves towards the arc groove position of the through-slot cylinder 34. The flue gas is filtered again by the arc groove of the through-slot cylinder 34. The filtered flue gas enters the interior of the through-slot cylinder 34 and then enters the interior of the air chamber mechanism 2 through the intake cylinder 31.

Claims

1. A centrifugal fan for fire ventilation, characterized in that, include: Air cavity mechanism (2), the bottom of the air cavity mechanism (2) is fixedly installed with a base (1), a motor (5) is fixedly installed on one side of the air cavity mechanism (2), and an air intake mechanism (3) is fixedly installed on the other side of the air cavity mechanism (2). An exhaust pipe (6) is fixedly installed on the top of the air cavity mechanism (2), and a fan wheel mechanism (4) is rotatably installed inside the air cavity mechanism (2). The fan wheel mechanism (4) includes a cavity disk (408), an annular groove is provided on the outer side of the cavity disk (408), and a cavity is provided inside the cavity disk (408). A connecting disk (406) is fixedly installed on the side of the cavity disk (408) away from the motor (5). A groove is provided on the side of the connecting disk (406) near the cavity disk (408), and a cavity is formed between the connecting disk (406) and the cavity disk (408) through the groove. An impeller disk (401) is fixedly installed on the side of the connecting disk (406) away from the cavity disk (408). An inner blade plate (405) is fixedly installed on the side of the impeller disk (401) away from the connecting disk (406). The inner blade plate (405) is evenly installed along the center position of the impeller disk (401), and the width of the inner blade plate (405) gradually increases as it moves away from the center position of the impeller disk (401).

2. A centrifugal fan for fire ventilation according to claim 1, characterized in that: An outer blade plate (404) is fixedly installed on the side of the impeller disk (401) away from the connecting disk (406). The outer blade plate (404) is evenly installed along the center position of the impeller disk (401). The outer blade plate (404) is evenly installed on the outside of the impeller disk (401) and is located outside the inner blade plate (405).

3. A centrifugal fan for fire ventilation according to claim 2, characterized in that: A fixing ring (407) is fixedly installed on the outer side of the impeller disk (401). The fixing ring (407) is located on the outer side of the outer blade (404). An inner scraper (403) is fixedly installed on the outer side of the fixing ring (407). An inner support ring (402) is fixedly installed on the side of the inner scraper (403) away from the fixing ring (407). The side of the inner support ring (402) away from the inner scraper (403) is in contact with the inner wall of the air chamber mechanism (2).

4. A centrifugal fan for fire ventilation according to claim 3, characterized in that: A side ring plate (409) is fixedly installed on the side of the cavity disk (408) near the motor (5), and a side blade plate (410) is fixedly installed on the side of the side ring plate (409) away from the cavity disk (408). The side blade plate (410) is evenly installed along the center position of the side ring plate (409), and the outer side of the side ring plate (409) is in contact with the inner wall of the air cavity mechanism (2).

5. A centrifugal fan for fire ventilation according to claim 4, characterized in that: The air cavity mechanism (2) includes a cavity cylinder (21), which is a double-layer shell structure. The cavity cylinder (21) has an inner arc groove and an outer arc groove on the side near the motor (5). A support cylinder (26) is fixedly installed on the side of the cavity cylinder (21) near the motor (5). The inner arc groove is located inside the support cylinder (26), and the outer arc groove is located outside the support cylinder (26).

6. A centrifugal fan for fire ventilation according to claim 5, characterized in that: The end of the support cylinder (26) away from the cavity cylinder (21) is fixedly connected to the motor (5). The output end of the motor (5) is fixedly connected to the drive shaft (24) through a coupling. A bearing (25) is fixedly installed on the outside of the drive shaft (24). The drive shaft (24) is rotatably connected to the inner wall of the cavity cylinder (21) through the bearing (25). The end of the drive shaft (24) away from the motor (5) is fixedly connected to the outside of the cavity disk (408).

7. A centrifugal fan for fire ventilation according to claim 6, characterized in that: An outer ring cover (27) is fixedly installed at the outer arc groove of the cavity cylinder (21). The outer ring cover (27) has a centrally protruding arc surface on the side away from the cavity cylinder (21). Filter holes are uniformly opened on the outer side of the outer ring cover (27). An inner convex ring (23) is fixedly installed on the inner wall of the cavity cylinder (21). Column grooves are uniformly opened on the inner wall of the inner convex ring (23). An inner rotating block (22) is rotatably installed at the column groove of the inner convex ring (23). The inner convex ring (23) is rotatably adapted to the ring groove of the cavity disk (408) through the inner rotating block (22).

8. A centrifugal fan for fire ventilation according to claim 7, characterized in that: The air intake mechanism (3) includes an air intake cylinder (31), one end of which is fixedly connected to the outside of the cavity cylinder (21), and the end of the air intake cylinder (31) away from the cavity cylinder (21) is a cone with an outer diameter that gradually increases as it moves away from the cavity cylinder (21).

9. A centrifugal fan for fire ventilation according to claim 8, characterized in that: A groove ring (32) is fixedly installed on the inner wall of the air intake cylinder (31) away from the cavity cylinder (21). A grid cover (33) is fixedly installed on the inner wall of the groove ring (32). Grid columns are evenly arranged inside the grid cover (33), and grid grooves are formed between the grid columns. A fixing cover (35) is fixedly installed on the inner wall of the air intake cylinder (31). An inner slip ring (37) is slidably installed between the fixing cover (35) and the air intake cylinder (31).

10. A centrifugal fan for fire ventilation according to claim 9, characterized in that: A through groove cylinder (34) is fixedly installed on one side of the inner slip ring (37). The side of the through groove cylinder (34) near the grid cover (33) is a raised arc surface, and an arc through groove is evenly opened on the arc surface. An inner ring pad (36) is fixedly installed between the other side of the inner slip ring (37) and the inner wall of the fixed cover (35). The inner ring pad (36) is made of elastic material.

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