Low pressure loss multi-blade centrifugal fan

Abstract

This invention relates to the field of centrifugal fan technology and discloses a low-pressure-loss multi-blade centrifugal fan, comprising a main body with a motor fixedly connected to the top of the main body. The rubber block of this invention causes the filter plate to rotate slightly on the inner wall of the second fixed ring. Because the rotating rod drives the connecting rod at a relatively high speed, the filter plate rotates slowly when the two pushing blocks rotate. Since the airflow continuously enters the fan casing through the filter plate and the first fixed ring, dust and impurities adhering to the airflow will adhere to the surface of the filter plate. When the filter plate rotates, the scraper removes the dust from the surface of the filter plate, causing the dust to fall out through the sliding groove. This reduces the possibility of dust entering the device and affecting the operation of the internal components of the fan during continuous airflow, keeping the inside of the fan casing clean and improving the quality of the fan during operation.

Description

Technical Field

[0001] This invention relates to the field of centrifugal fan technology, specifically to a low-pressure-loss multi-blade centrifugal fan. Background Technology

[0002] With its advantages of compact structure, large flow rate, and low noise, this device is widely used in low-pressure air supply fields such as HVAC, air purification, commercial smoke exhaust, and industrial ventilation. During the use of this device, the air inlet of the fan casing is first connected to the air delivery pipe, and then the top of the fan casing is connected to the exhaust pipe. When the motor starts, its output end will drive the rotating shaft to rotate inside the fan casing via a belt. When the rotating shaft rotates, it will drive the fan blades to rotate, creating a low pressure at the center and throwing the airflow towards the inner wall of the fan casing. The thrown airflow will be discharged outward through the air outlet of the fan casing. Because the device continuously delivers air, some dust may enter the device and affect the operation of the internal components of the fan, thus affecting the movement of the fan blades and the quality of the output airflow. Summary of the Invention

[0003] The purpose of this invention is to provide a low-pressure-loss multi-blade centrifugal fan to solve the problems mentioned in the background art.

[0004] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: This invention relates to a low-pressure-loss multi-blade centrifugal fan, comprising a main body, a motor fixedly connected to the top of the main body, a fan casing fixedly connected to the top of the main body, and a rotating shaft rotatably connected inside the fan casing, and further comprising: The moving mechanism is installed on the side wall of the main body; The moving mechanism includes a fixed ring 1 that is fixedly connected to the side wall of the fan casing, and a tapered plate is fixedly connected to the inner wall of the fixed ring 1. A retraction mechanism is installed on the inner wall of the moving mechanism; The retraction mechanism includes a fixed plate that is fixedly connected to the inner wall of the moving mechanism, and a spring is provided on the side of the fixed plate near the fan casing; The fan casing has an air inlet on the side away from the rotating shaft, and a belt is fitted on the end of the rotating shaft away from the fan casing. The end of the belt away from the rotating shaft is fitted on the outer surface of the motor output shaft.

[0005] Furthermore, the main body includes: Air supply assembly, which is installed inside the fan casing, is used to deliver air after startup; A rotating assembly is installed on the side wall of a rotating shaft and is used to rotate under the drive of the rotating shaft.

[0006] Furthermore, mobile mechanisms also include: The airflow guiding component is installed on the side wall of the fan casing to guide the airflow into the interior of the fan casing. The sliding component is installed on the side wall of the fixed ring and is used to slide when the rotating component rotates, driven by the internal components.

[0007] Furthermore, the shrinkage mechanism also includes: The push component is installed on the side of the fixed plate near the spring and is used to move under the thrust when the spring contracts. The auxiliary component is installed on the side wall of the fixed plate to assist in the operation of the push component when it is moved.

[0008] Furthermore, the air supply assembly includes several fan blades fixedly connected to the outer surface of the rotating shaft; Several of the fan blades are arc-shaped, and several of the fan blades are located inside the fan casing.

[0009] Furthermore, the rotating assembly includes a rotating rod fixedly connected to the side wall of the rotating shaft, a connecting rod fixedly connected to the outer surface of the rotating rod, and several push blocks fixedly provided on the side of the connecting rod near the spring; A filter plate is set between several pushing blocks, and rubber blocks are fixedly connected to the outer surface of the filter plate; There are two push blocks, and the outer surfaces of the two push blocks are in contact with the inner wall of the fixing ring.

[0010] Furthermore, the drainage component includes several arc-shaped plates fixedly connected to the inner wall of the conical plate; Several of the curved plates are arranged in a spiral pattern.

[0011] Furthermore, the sliding assembly includes a fixed ring one and a fixed ring two on the side away from the fan casing. The inner wall of the fixed ring two is provided with a sliding groove, and a baffle is slidably connected inside the sliding groove. The inner wall of the second fixing ring is rotatably connected to the side wall of the filter plate, and the end of the spring away from the filter plate is fixedly connected to the inner wall of the second fixing ring.

[0012] Furthermore, the actuating component includes a sliding plate that is slidably connected to the fixed plate on the side near the spring; The sidewall of the sliding plate is in contact with the sidewall of the filter plate, and the side of the sliding plate is inclined.

[0013] Furthermore, the auxiliary components include a scraper fixedly connected to the side of the sliding plate near the sliding groove, and a number of positioning plates fixedly connected to the side of the scraper near the baffle. A pusher plate is fixedly connected to the side wall of the filter plate; There are two positioning plates, a baffle is set between the two positioning plates, and the side wall of the scraper is fixedly connected to the side wall of the sliding plate.

[0014] The present invention has the following beneficial effects: (1) In this invention, the rubber block will contract under the thrust of the push block, and at the same time the rubber block will drive the filter plate to rotate slightly on the inner wall of the second fixed ring. Since the rotation speed of the connecting rod driven by the rotating rod is relatively fast, the filter plate will rotate slowly when the two push blocks rotate. Since the airflow continuously enters the inside of the fan housing through the filter plate and the first fixed ring, the dust and impurities attached to the airflow will adhere to the surface of the filter plate. When the filter plate rotates, the scraper will scrape off the dust on the surface of the filter plate, so that the dust falls to the outside of the sliding groove through the sliding groove. This reduces the situation where some dust enters the inside of the device and affects the operation of the internal components of the fan when the wind is continuously conveyed by the device, keeping the inside of the fan housing clean and improving the quality of the fan during operation.

[0015] (2) In this invention, after the gas enters the interior of the conical plate, it will spiral into the interior of the fan casing under the guidance of several arc plates. At the same time, the spiral movement of the airflow is consistent with the rotation direction of the fan blades. Therefore, when the gas spirals into the interior of the fan casing, it will start to rotate under the drive of the rotating fan blades. Subsequently, the airflow is thrown out towards the inner wall of the fan casing under the rotation of the fan blades. The thrown airflow can be discharged outward through the air outlet at the top of the fan casing, thereby reducing the situation where the gas enters the interior of the fan casing through the air inlet, causing vortices to appear at the air inlet due to the high rotation speed of the internal fan blades, resulting in some gas vortices at the air inlet. This ensures the stability of the gas entry and improves the efficiency of the fan during operation.

[0016] (3) In the process of sliding the sliding plate, the scraper will be pushed to move synchronously into the sliding groove. At the same time, the sliding plate will apply a pushing force to the spring on the side wall, causing it to contract and accumulate potential energy on the inner wall of the second fixed ring. When the sliding plate moves closer to the sliding groove, the scraper will scrape off the dust attached to the surface of the filter plate. The scraped dust will fall to the outside of the second fixed ring through the sliding groove, thereby reducing the situation where the dust attached to the surface of the filter plate is blown away and scattered due to the continuous delivery of the airflow after the filter plate filters the dust attached to the airflow. This enhances the cleaning effect on the filter plate and further improves the quality of the fan during operation.

[0017] (4) In this invention, when the baffle slides downward, the sliding groove is connected to the outside of the second fixed ring. Subsequently, under the continuous movement of the sliding plate and the scraper, the dust scraped by the scraper and the sliding plate will be discharged to the outside of the second fixed ring through the sliding groove. When the scraper is reset, it will drive the positioning plate at the bottom to move upward and contact the bottom of the baffle to push the baffle to reset. This ensures that the inside of the second fixed ring remains closed when the dust is not scraped. This reduces the situation where, when the gas is transported to the inside of the fan housing through the second fixed ring, some gas enters the position of the second fixed ring through the sliding groove due to the connection between the sliding groove and the outside, thus causing turbulence with the transported airflow. This ensures the airtightness of the device and improves the efficiency of the fan during operation.

[0018] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall partial cross-sectional structure of the present invention; Figure 3 This is a partial cross-sectional view of the air supply component of the present invention; Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle; Figure 5 This is a partial cross-sectional view of the rotating component of the present invention; Figure 6 For the present invention Figure 5 Enlarged view of point B in the middle; Figure 7 This is a partial cross-sectional view of the drainage component of the present invention; Figure 8 This is a planar diagram of the drainage component of the present invention; Figure 9 For the present invention Figure 8 Enlarged view of point C in the middle; Figure 10 This is a partial cross-sectional view of the auxiliary component of the present invention; Figure 11 This is a diagram showing the connection relationships of the auxiliary components of the present invention.

[0021] The attached diagram lists the components represented by each number as follows: In the diagram: 1. Main body; 101. Motor; 11. Air supply assembly; 111. Fan housing; 112. Rotating shaft; 113. Fan blade; 12. Rotating assembly; 121. Rotating rod; 122. Connecting rod; 123. Pushing block; 124. Filter plate; 125. Rubber block; 2. Moving mechanism; 21. Drainage assembly; 211. Fixing ring one; 212. Conical plate; 213. Arc plate; 22. Sliding assembly; 221. Fixing ring two; 222. Sliding groove; 223. Baffle; 3. Retraction mechanism; 31. Pushing assembly; 311. Fixing plate; 312. Spring; 313. Sliding plate; 32. Auxiliary assembly; 321. Scraper; 322. Positioning plate; 323. Pushing plate. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Please see Figures 1-11 As shown, the present invention is a low-pressure-loss multi-blade centrifugal fan, including a main body 1, a motor 101 fixedly connected to the top of the main body 1, a fan housing 111 fixedly connected to the top of the main body 1, a rotating shaft 112 rotatably connected inside the fan housing 111, and further including: The moving mechanism 2 is installed on the side wall of the main body 1; The moving mechanism 2 includes a fixing ring 211 fixedly connected to the side wall of the fan housing 111, and a tapered plate 212 fixedly connected to the inner wall of the fixing ring 211. Shrinking mechanism 3 is installed on the inner wall of moving mechanism 2; The retraction mechanism 3 includes a fixed plate 311 fixedly connected to the inner wall of the moving mechanism 2, and a spring 312 is provided on the side of the fixed plate 311 near the fan housing 111. The fan housing 111 has an air inlet on the side away from the rotating shaft 112, and a belt is fitted on the end of the rotating shaft 112 away from the fan housing 111. The end of the belt away from the rotating shaft 112 is fitted on the outer surface of the output shaft of the motor 101.

[0024] Entity 1 includes: Air supply assembly 11 is installed inside the fan housing 111 and is used to deliver air after startup. Rotating assembly 12 is mounted on the side wall of rotating shaft 112 and is used to rotate under the drive of rotating shaft 112.

[0025] Mobile mechanism 2 also includes: The airflow guiding component 21 is installed on the side wall of the fan housing 111 and is used to guide the airflow into the interior of the fan housing 111. The sliding component 22 is installed on the side wall of the fixed ring 211 and is used to slide when the rotating component 12 is rotated by the internal components.

[0026] The shrink mechanism 3 also includes: Push component 31 is installed on the side of fixed plate 311 near spring 312 and is used to move when spring 312 is contracted by a pushing force; Auxiliary component 32 is installed on the side wall of fixed plate 311 and is used to assist the operation of push component 31 when it is moved.

[0027] The air supply assembly 11 includes a plurality of fan blades 113 fixedly connected to the outer surface of the rotating shaft 112; Among them, several fan blades 113 are all arc-shaped and are located inside the fan housing 111. When the rotating shaft 112 rotates, it will drive the fan blades 113 to rotate. When the fan blades 113 rotate, a low pressure will be formed at the center, which will throw the airflow towards the inner wall of the fan housing 111.

[0028] The rotating assembly 12 includes a rotating rod 121 fixedly connected to the side wall of the rotating shaft 112. A connecting rod 122 is fixedly connected to the outer surface of the rotating rod 121. Several push blocks 123 are fixedly arranged on the side of the connecting rod 122 near the spring 312. A filter plate 124 is arranged between several push blocks 123, and a rubber block 125 is fixedly connected to the outer surface of the filter plate 124. There are two push blocks 123. The outer surfaces of the two push blocks 123 are in contact with the inner wall of the fixing ring 211. When the connecting rod 122 rotates, it will drive the push blocks 123 to rotate between the filter plate 124 and the fixing ring 211. During the rotation of the push blocks 123, they will contact the rubber block 125 on the outer surface of the filter plate 124. During the rotation of the push blocks 123 and the contact with the rubber block 125, the rubber block 125 will be compressed by the pushing force of the push blocks 123.

[0029] The drainage component 21 includes several arc-shaped plates 213 fixedly connected to the inner wall of the conical plate 212; Among them, several arc-shaped plates 213 are arranged in a spiral. After passing through the filter plate 124, the gas will enter the interior of the conical plate 212. After the gas enters the interior of the conical plate 212, it will flow spirally into the interior of the fan casing 111 under the guidance of several arc-shaped plates 213.

[0030] The sliding assembly 22 includes a first fixed ring 211 and a second fixed ring 221 on the side away from the fan housing 111. The inner wall of the second fixed ring 221 is provided with a sliding groove 222, and a baffle 223 is slidably connected inside the sliding groove 222. The inner wall of the second fixed ring 221 is rotatably connected to the side wall of the filter plate 124. The end of the spring 312 away from the filter plate 124 is fixedly connected to the inner wall of the second fixed ring 221. When the sliding plate 313 moves closer to the sliding groove 222, the dust attached to the surface of the filter plate 124 will be scraped off by the scraper 321. The scraped dust will fall off to the outside of the second fixed ring 221 through the sliding groove 222.

[0031] The pushing component 31 includes a sliding plate 313 that is slidably connected to the fixed plate 311 on the side near the spring 312; The sidewall of the sliding plate 313 contacts the sidewall of the filter plate 124. The side of the sliding plate 313 is inclined. When the pushing plate 323 gradually contacts the sliding plate 313, it will push the sliding plate 313 to slide towards the sliding groove 222 on the sidewall of the fixed plate 311. During the sliding process of the sliding plate 313, it will push the scraper 321 to move into the sliding groove 222 simultaneously. At the same time, the sliding plate 313 will apply a pushing force to the spring 312 on the sidewall, causing it to contract on the inner wall of the fixed ring 221 and accumulate potential energy.

[0032] The auxiliary component 32 includes a scraper 321 fixedly connected to the side of the sliding plate 313 near the sliding groove 222, and a plurality of positioning plates 322 fixedly connected to the side of the scraper 321 near the baffle 223. A pusher plate 323 is fixedly connected to the side wall of the filter plate 124; There are two positioning plates 322, and a baffle 223 is set between the two positioning plates 322. The side wall of the scraper 321 is fixedly connected to the side wall of the sliding plate 313. When the positioning plate 322 in contact with the baffle 223 moves outward from the fixed ring 221, the position of the baffle 223 does not change because the baffle 223 is not subjected to any other force. Then, under the continuous movement of the scraper 321, the other positioning plate 322 will contact the inner wall of the baffle 223, and the positioning plate 322 will push the baffle 223 to slide downward inside the sliding groove 222.

[0033] In use, first connect the air inlet of the fan housing 111 to the air delivery pipe, then connect the top of the fan housing 111 to the exhaust pipe, and start the motor 101. When the motor 101 starts, its output end will drive the rotating shaft 112 to rotate inside the fan housing 111 via a belt. When the rotating shaft 112 rotates, it will drive the fan blades 113 to rotate. When the fan blades 113 rotate, a low pressure will be formed at the center, which will throw the airflow toward the inner wall of the fan housing 111. The thrown airflow will be discharged outward through the air outlet of the fan housing 111. At the same time, when a low pressure is formed at the center of the rotating fan blades 113, airflow will be absorbed from the outside of the fan housing 111 through the air inlet of the fan housing 111 and rotated, thus completing the process of continuous airflow delivery by the low-pressure fan.

[0034] When the rotating shaft 112 drives the fan blade 113 to rotate, the rotating shaft 112 will drive the connecting rod 122 to rotate via the rotating rod 121. During the rotation of the connecting rod 122, it will drive the pushing block 123 to rotate between the filter plate 124 and the fixing ring 211. During the rotation of the pushing block 123, it will contact the rubber block 125 on the outer surface of the filter plate 124. During the rotation of the pushing block 123 and its contact with the rubber block 125, the rubber block 125 will be pushed and contracted by the pushing block 123. At the same time, the rubber block 125 will drive the filter plate 124 to rotate slightly on the inner wall of the fixing ring 221. Since the rotation speed of the connecting rod 122 driven by the rotating rod 121 is relatively high... The airflow is fast, so when the two push blocks 123 rotate, the filter plate 124 will rotate slowly. Since the airflow continuously enters the inside of the fan housing 111 through the filter plate 124 and the fixing ring 211, the dust and impurities attached to the airflow will adhere to the surface of the filter plate 124. When the filter plate 124 rotates, the scraper 321 will scrape off the dust on the surface of the filter plate 124, so that the dust falls to the outside of the sliding groove 222 through the sliding groove 222. This reduces the situation where some dust enters the inside of the device and affects the operation of the internal components of the fan when the air is continuously conveyed by the device, keeping the inside of the fan housing 111 clean and improving the quality of the fan during operation.

[0035] As the rotating shaft 112 drives the internal components of the fan to rotate, gas continuously flows through the filter plate 124 into the fan housing 111. Since the filter plate 124 rotates slowly under the push of the push block 123, the gas passes through the filter plate 124 without generating large eddies at the contact points. After passing through the filter plate 124, the gas enters the conical plate 212. Once inside the conical plate 212, the gas spirals into the fan housing 111 under the guidance of several arc-shaped plates 213. Simultaneously, the airflow spirals... The direction of the spiral movement is the same as the direction of the rotation of the fan blade 113. Therefore, when the gas spiral enters the inside of the fan housing 111, it will start to rotate under the drive of the rotating fan blade 113. Then, the airflow is thrown out towards the inner wall of the fan housing 111 under the rotation of the fan blade 113. The thrown airflow can be discharged outward through the air outlet at the top of the fan housing 111. This reduces the situation where the gas enters the inside of the fan housing 111 through the air inlet, and the air inlet is turbulent due to the high rotation speed of the fan blade 113. This ensures the stability of the gas entry and improves the efficiency of the fan during operation.

[0036] When the filter plate 124 slowly rotates on the inner wall of the fixed ring 221, the filter plate 124 will drive the push plate 323 to rotate. When the push plate 323 rotates, it will gradually come into contact with the side of the sliding plate 313. Since the side of the sliding plate 313 is inclined, when the push plate 323 gradually comes into contact with the sliding plate 313, it will push the sliding plate 313 to slide on the side wall of the fixed plate 311 towards the sliding groove 222. During the sliding process of the sliding plate 313, it will push the scraper 321 to move synchronously into the sliding groove 222. At the same time, the sliding plate 313 will spring against the side wall. Spring 312 applies a thrust to cause it to contract and accumulate potential energy on the inner wall of fixed ring 221. When sliding plate 313 moves closer to sliding groove 222, it scrapes off the dust attached to the surface of filter plate 124 through scraper 321. The scraped dust falls to the outside of fixed ring 221 through sliding groove 222, thereby reducing the situation where the dust attached to the surface of filter plate 124 is blown away and scattered due to the continuous delivery of airflow after the filter plate 124 filters the dust attached to the airflow. This enhances the cleaning effect of filter plate 124 and further improves the quality of the fan during operation.

[0037] When the sliding plate 313 moves toward the sliding groove 222, it pushes the positioning plate 322 on the side wall of the scraper 321 toward the outside of the second fixing ring 221. When the positioning plate 322, which is in contact with the baffle 223, moves toward the outside of the second fixing ring 221, the position of the baffle 223 does not change because the baffle 223 is not subjected to any other force. Then, with the continuous movement of the scraper 321, another positioning plate 322 will contact the inner wall of the baffle 223. This positioning plate 322 will push the baffle 223 to slide downward inside the sliding groove 222. When the baffle 223 slides downward, the sliding groove 222 communicates with the outside of the second fixing ring 221. Subsequently, with the continuous movement of the sliding plate 313 and the scraper 321... The dust scraped off by the scraper 321 and the sliding plate 313 will be discharged to the outside of the fixed ring 221 through the sliding groove 222. When the scraper 321 is reset, it will drive the positioning plate 322 at the bottom to move upward and contact the bottom of the baffle 223 to push the baffle 223 to reset. This ensures that the inside of the fixed ring 221 remains closed when the dust is not scraped off. This reduces the possibility that when the gas is transported to the inside of the fan housing 111 through the fixed ring 221, some gas will enter the position of the fixed ring 221 through the sliding groove 222 because the sliding groove 222 is connected to the outside, thus causing turbulence with the transported airflow. This ensures the airtightness of the device and improves the efficiency of the fan during operation.

[0038] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A low-pressure-loss multi-blade centrifugal fan, comprising a main body (1), wherein a motor (101) is fixedly connected to the top of the main body (1), and a fan housing (111) is fixedly connected to the top of the main body (1), wherein a rotating shaft (112) is rotatably connected inside the fan housing (111), characterized in that, Also includes: The moving mechanism (2) is installed on the side wall of the main body (1); The moving mechanism (2) includes a fixing ring (211) fixedly connected to the side wall of the fan housing (111), and a tapered plate (212) is fixedly connected to the inner wall of the fixing ring (211). A shrinking mechanism (3) is installed on the inner wall of the moving mechanism (2); The retraction mechanism (3) includes a fixed plate (311) fixedly connected to the inner wall of the moving mechanism (2), and a spring (312) is provided on the side of the fixed plate (311) near the fan housing (111). The fan housing (111) has an air inlet on the side away from the rotating shaft (112), and a belt is fitted on the end of the rotating shaft (112) away from the fan housing (111). The end of the belt away from the rotating shaft (112) is fitted on the outer surface of the output shaft of the motor (101).

2. The low-pressure-loss multi-blade centrifugal fan according to claim 1, characterized in that: The main body (1) includes: An air supply assembly (11) is installed inside the fan housing (111) and is used to deliver air power after startup. A rotating assembly (12) is installed on the side wall of a rotating shaft (112) for rotating under the drive of the rotating shaft (112).

3. A low-pressure-loss multi-blade centrifugal fan according to claim 2, characterized in that: The moving mechanism (2) also includes: A flow guiding component (21) is installed on the side wall of the fan housing (111) to guide the airflow into the interior of the fan housing (111); The sliding component (22) is installed on the side wall of the fixed ring (211) and is used to slide when the rotating component (12) is rotated by the internal components.

4. A low-pressure-loss multi-blade centrifugal fan according to claim 3, characterized in that: The shrinkage mechanism (3) further includes: A push assembly (31) is installed on the side of the fixed plate (311) near the spring (312) for moving under the thrust when the spring (312) contracts; An auxiliary component (32) is installed on the side wall of the fixed plate (311) to assist the operation of the pushing component (31) when the pushing component (31) moves.

5. A low-pressure-loss multi-blade centrifugal fan according to claim 4, characterized in that: The air supply assembly (11) includes a plurality of fan blades (113) fixedly connected to the outer surface of the rotating shaft (112). Among them, several of the fan blades (113) are arc-shaped and are located inside the fan housing (111).

6. A low-pressure-loss multi-blade centrifugal fan according to claim 5, characterized in that: The rotating assembly (12) includes a rotating rod (121) fixedly connected to the side wall of the rotating shaft (112), and a connecting rod (122) fixedly connected to the outer surface of the rotating rod (121). Several push blocks (123) are fixedly provided on the side of the connecting rod (122) near the spring (312). A filter plate (124) is provided between several of the push blocks (123), and a rubber block (125) is fixedly connected to the outer surface of the filter plate (124).

7. A low-pressure-loss multi-blade centrifugal fan according to claim 6, characterized in that: The drainage component (21) includes a plurality of arc-shaped plates (213) fixedly connected to the inner wall of the conical plate (212); Among them, several of the arc-shaped plates (213) are spirally arranged as a whole.

8. A low-pressure-loss multi-blade centrifugal fan according to claim 6, characterized in that: The sliding assembly (22) includes a fixed ring one (211) on the side away from the fan housing (111) and a fixed ring two (221). The inner wall of the fixed ring two (221) is provided with a sliding groove (222), and a baffle (223) is slidably connected inside the sliding groove (222). The inner wall of the second fixing ring (221) is rotatably connected to the side wall of the filter plate (124), and the end of the spring (312) away from the filter plate (124) is fixedly connected to the inner wall of the second fixing ring (221).

9. A low-pressure-loss multi-blade centrifugal fan according to claim 4, characterized in that: The pushing assembly (31) includes a sliding plate (313) that is slidably connected to the fixed plate (311) on the side near the spring (312). The sidewall of the sliding plate (313) is in contact with the sidewall of the filter plate (124), and the side of the sliding plate (313) is inclined.

10. A low-pressure-loss multi-blade centrifugal fan according to claim 9, characterized in that: The auxiliary component (32) includes a scraper (321) fixedly connected to the side of the sliding plate (313) near the sliding groove (222), and a plurality of positioning plates (322) are fixedly connected to the side of the scraper (321) near the baffle (223). A pusher plate (323) is fixedly connected to the side wall of the filter plate (124). The sidewall of the scraper (321) is fixedly connected to the sidewall of the sliding plate (313).

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