Silent centrifugal fan

Abstract

The utility model discloses a mute centrifugal fan, which belongs to the technical field of centrifugal fans and comprises a shell, a silencing plate is fixedly mounted between the inner walls of the shell, a filter screen is fixedly mounted at an air inlet of the shell, an impeller cylinder is rotatably mounted on the filter screen, a threaded rod is in threaded connection with the filter screen, and the impeller cylinder is rotatably mounted on the threaded rod. And the threaded rod penetrates through the filter screen, the threaded rod is slidably sleeved with a connecting block, and the connecting block is fixedly connected with a connecting rod. Through rotation of the threaded rod, the connecting block, the connecting rod, the first cleaning plate and the second cleaning plate move, meanwhile, structures such as the connecting rod rotate, the first cleaning plate and the second cleaning plate move and rotate to clean an impeller in the impeller cylinder, and the problems that energy consumption is increased and efficiency is reduced due to dust accumulation are solved; and meanwhile, the possibility that the impeller is damaged due to long-term accumulation of dust is avoided, a spring I shakes off the dust on a cleaning plate I and a cleaning plate II through vibration, and next-time use is facilitated.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal fan technology, and in particular to a silent centrifugal fan. Background Technology

[0002] With the improvement of people's living standards and the increasing requirements for industrial production environments, higher demands are being placed on noise control during the operation of fans. In homes, offices, hospitals, schools and other places, low-noise ventilation equipment is needed to create a quiet and comfortable environment. In some noise-sensitive industrial fields, such as electronic chip manufacturing workshops, silent centrifugal fans can avoid the impact of noise on the production process and product quality.

[0003] Modern silent centrifugal fans, while providing ventilation, also bring in dust from the air, which undoubtedly causes trouble for users. With long-term use, the dust drawn in will adhere to the impeller, making it extremely difficult to clean the inside of the impeller cylinder. The large accumulation and agglomeration of dust will increase the weight of the impeller, which will increase energy consumption, reduce work efficiency, and the accumulation of dust may also corrode the impeller, causing damage. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a silent centrifugal fan.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A silent centrifugal fan includes a housing, with a sound-absorbing plate fixedly installed between the inner walls of the housing. A filter screen is fixedly installed at the air inlet of the housing, and an impeller cylinder is rotatably installed on the filter screen. A threaded rod is threadedly connected to the filter screen, the threaded rod passing through the filter screen. A connecting block is slidably sleeved on the threaded rod, and a connecting rod is fixedly connected to the connecting block. A first cleaning plate is rotatably connected to the connecting rod, and a torsion spring is fixedly connected between the connecting rod and the first cleaning plate. A second spring is fixedly installed on the first cleaning plate, and a second cleaning plate is fixedly connected to the second spring. A mounting bracket is fixedly installed on the housing, and a motor is fixedly installed on the mounting bracket. A rotating shaft is fixedly installed on the output end of the motor, and the rotating shaft is fixedly connected to the impeller cylinder.

[0007] Preferably, a fixing plate is fixedly sleeved on the threaded rod, a spring is fixedly connected between the connecting block and the fixing plate, a sleeve is slidably sleeved on the threaded rod, the sleeve extends to the outside of the threaded rod and is fixedly connected to a pressing plate, and the sleeve is fixedly connected to the connecting block.

[0008] Preferably, the threaded rod is installed at the center of the filter screen, and a rotating ring is fixedly connected to the side wall of the threaded rod, with a rubber layer wrapped around the outside of the rotating ring.

[0009] Preferably, the filter screen is in the shape of a concave "U", and filter holes are opened on both the side wall and the front of the filter screen.

[0010] Preferably, the cleaning surfaces of the first cleaning plate and the second cleaning plate are arc-shaped.

[0011] Preferably, the impeller material on the impeller cylinder is a high-strength engineering plastic.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: by rotating the threaded rod, the connecting block, the connecting rod, and the first and second cleaning plates move, and at the same time, the connecting rod and other structures rotate. The movement and rotation of the first and second cleaning plates clean the impeller inside the impeller cylinder, avoiding the problem of increased energy consumption and reduced efficiency caused by dust accumulation. It also avoids the possibility of long-term dust accumulation damaging the impeller. In addition, the first spring shakes off the dust on the first and second cleaning plates through vibration, making it convenient for the next use. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of a silent centrifugal fan proposed in this utility model;

[0014] Figure 2 This is a cross-sectional three-dimensional structural diagram of a silent centrifugal fan proposed in this utility model;

[0015] Figure 3 This is a three-dimensional structural diagram of the threaded rod of a silent centrifugal fan proposed in this utility model.

[0016] In the diagram: 1. Outer shell, 2. Impeller cylinder, 3. Filter screen, 4. Motor, 5. Shaft, 6. Silencing plate, 7. Threaded rod, 8. Rotary ring, 9. Fixing plate, 10. Spring 1, 11. Connecting block, 12. Sleeve, 13. Cleaning plate 1, 14. Cleaning plate 2, 15. Torsion spring, 16. Spring 2, 17. Connecting rod. Detailed Implementation

[0017] Reference Figures 1-3A silent centrifugal fan includes a housing 1, with a sound-absorbing plate 6 fixedly installed between the inner walls of the housing 1. The sound-absorbing plate 6 has the function of shock absorption and noise reduction. A filter screen 3 is fixedly installed at the air inlet of the housing 1. An impeller cylinder 2 is rotatably installed on the filter screen 3. The filter screen 3 is used to filter pollutants with larger particles in the air. A threaded rod 7 is threadedly connected to the filter screen 3. The filter screen 3 has threads that match the threaded rod 7. The threaded rod 7 passes through the filter screen 3. A connecting block 11 is slidably sleeved on the threaded rod 7. A connecting rod 17 is fixedly connected to the connecting block 11. A cleaning plate 13 is rotatably connected to the connecting rod 17. A torsion spring 15 is fixedly connected between the connecting rod 7 and the cleaning plate 13. A spring 16 is fixedly installed on the cleaning plate 13. A cleaning plate 14 is fixedly connected to the spring 16. A mounting bracket is fixedly installed on the housing 1. A motor 4 is fixedly installed on the mounting bracket. A rotating shaft 5 is fixedly installed on the output end of the motor 4. The rotating shaft 5 is fixedly connected to the impeller cylinder 2.

[0018] During operation, motor 4 is started, and the shaft 5 connected to the output end of motor 4 rotates, driving impeller cylinder 2 to rotate and generate airflow. Motor 4 and impeller cylinder 2 are existing publicly available technologies, so the working principle of this technology will not be elaborated in detail. During cleaning, motor 4 is turned off, and then the rotating ring 8 is rotated to make the threaded rod 7 rotate. Under the action of the thread, the threaded rod 7 moves, driving the connecting block 11 and connecting rod 17 to move together. At the same time, the connecting block 11, which is slidably sleeved with the threaded rod 7, rotates, causing the connecting rod 17 on the connecting block 11 to rotate around the threaded rod 7 as the center. Cleaning plate one 13 and cleaning plate two move accordingly. And rotate. When the cleaning plate 13 contacts the impeller surface in the impeller cylinder 2, the cleaning plate 13 squeezes the impeller in the impeller cylinder 3. The reaction force of the impeller causes the torsion spring 15 to deform, and the cleaning plate 13 rotates, so that the cleaning plate 13 fits more closely to the impeller surface, so that the dust on the impeller can be cleaned. Under the action of the spring 2 16, the cleaning plate 2 14 can extend further and the cleaning range is larger, so as to clean the dust deeper in the impeller. When the cleaning plate 13 separates from the impeller, the torsion spring 15 returns to its original position, driving the cleaning plate 13 to return to its original position, so as to clean the next impeller.

[0019] A fixed plate 9 is fixedly sleeved on the threaded rod 7. A spring 10 is fixedly connected between the connecting block 11 and the fixed plate 9. The spring 10 is a delayed return spring, so the spring 10 will relax after the impeller is separated from it for a period of time. A sleeve 12 is slidably sleeved on the threaded rod 7. The sleeve 12 extends to the outside of the threaded rod 7 and is fixedly connected to a pressing plate. The sleeve 12 is also fixedly connected to the connecting block 11.

[0020] As the connecting block 11 moves, the extrusion plate contacts and presses against the side wall of the impeller cylinder 2, causing the spring 10 to deform. Then, the threaded rod 7 rotates in the opposite direction and moves to the outside of the outer casing 1, causing the connecting block 11 and other structures to move together. The impeller cylinder 2 separates from the extrusion block, the spring 10 relaxes, and the spring 10 vibrates under the inertia of the motion, causing the connecting block 11 and the connecting rod 17 to vibrate, shaking off the dust on the cleaning plate 13 and the cleaning plate 2 14, making it easier to continue cleaning next time.

[0021] The threaded rod 7 is installed at the center of the filter screen 3, which ensures that the threaded rod 7 is in the center position of the impeller cylinder 2, resulting in more uniform cleaning. A rotating ring 8 is fixedly connected to the side wall of the threaded rod 7. The outer side of the rotating ring 8 is covered with a rubber layer. The threaded rod 7 can be rotated by rotating the rotating ring 8, or by adding other items to the rotating ring 8 to make the rotating ring 8 rotate, thereby driving the threaded rod 7 to rotate. The rubber layer is used to protect the rotating ring 8.

[0022] The filter screen 3 is shaped like a concave "U". Filter holes are opened on both the side wall and the front of the filter screen 3. Before the device is operated, the threaded rod 7 is rotated. Since the impeller cylinder 2 is engaged with the rotating shaft 5 at this time, the impeller cylinder 2 cannot move in the horizontal direction, and the filter screen 3 connected to it cannot move either. Therefore, the rotation of the threaded rod 7 will cause it to move itself, driving the connecting block 11 and other structures to move together, moving the connecting block 11 and other structures to the inside of the filter screen 3, thus preventing the impeller cylinder 2 from colliding with the cleaning plate 13 and cleaning plate 24 when it rotates. Moreover, the torsion spring 15 and spring 2 16 allow the cleaning plate 13 and cleaning plate 2 14 to rotate, thereby moving to the inside of the filter screen 3.

[0023] The cleaning surfaces of cleaning plate 13 and cleaning plate 24 are arc-shaped. The arc-shaped structure allows the cleaning plate 13 and cleaning plate 24 to have a larger cleaning surface during the cleaning process, which can better remove the attached dust.

[0024] The impeller material on the impeller cylinder 2 is made of high-strength engineering plastic. Impellers made of engineering plastic have the advantages of corrosion resistance and noise reduction, and are lightweight, making them easy to install and use.

[0025] Before operation, the threaded rod 7 is rotated. Since the impeller cylinder 2 is fixed to the shaft 5 at this time, the impeller cylinder 2 cannot move horizontally, and the filter screen 3 connected to it cannot move either. Therefore, the rotation of the threaded rod 7 will cause it to move itself, driving the connecting block 11 and other structures to move together, moving the connecting block 11 and other structures to the inside of the filter screen 3, thus preventing the impeller cylinder 2 from colliding with the cleaning plate 13 and cleaning plate 14 when it rotates. Then, the motor 4 is started, and the shaft 5 connected to the output end of the motor 4 rotates, driving the impeller cylinder 2 to rotate. The device generates airflow. When cleaning, first turn off motor 4, then rotate the rotating ring 8 to rotate the threaded rod 7. Under the action of the thread, the threaded rod 7 moves, causing the connecting block 11 and connecting rod 17 to move together. Simultaneously, the connecting block 11, which is slidably connected to the threaded rod 7, rotates, causing the connecting rod 17 on the connecting block 11 to rotate around the threaded rod 7. Cleaning plate one 13 and cleaning plate two 14 move and rotate accordingly. When cleaning plate one 13 rotates to contact the impeller surface in the impeller cylinder 2, cleaning plate one 13 presses against the impeller in the impeller cylinder 3. The reaction force of the impeller causes the torsion spring... The first cleaning plate 13 rotates due to deformation, allowing it to fit more closely to the impeller surface for easier cleaning of dust. The second cleaning plate 14 extends further, covering a wider cleaning area to clean dust deeper into the impeller. Under the action of the second spring 16, the second cleaning plate 14 can rotate further to prevent motion interference. When the first cleaning plate 13 separates from the impeller, the torsion spring 15 returns to its original position, facilitating the cleaning of the next impeller section. Simultaneously, as the connecting block 11 moves, the pressing plate contacts the side wall of the impeller cylinder 2. The contact and compression cause the spring 10 to deform, and then the threaded rod 7 rotates in the opposite direction. The threaded rod 7 moves to the outside of the outer shell 1, driving the connecting block 11 and other structures to move together. The impeller cylinder 2 separates from the compression block, the spring 10 relaxes, and the spring 10 vibrates under the inertia of the motion, causing the connecting block 11 and the connecting rod 17 to vibrate, shaking off the dust on the cleaning plate 13 and the cleaning plate 2 14, making it easier to continue cleaning next time. Finally, the threaded rod 7 continues to rotate, so that the cleaning plate 13 and the cleaning plate 2 14 return to the inside of the filter screen 3, so as to facilitate the rotation of the impeller cylinder.

Claims

1. A silent centrifugal fan comprising a casing (1), characterized in that The inner wall of the shell (1) is fixedly installed with a sound-absorbing plate (6), the air inlet of the shell (1) is fixedly installed with a filter screen (3), the filter screen (3) is rotatably installed with an impeller cylinder (2), the filter screen (3) is threadedly connected with a threaded rod (7), the threaded rod (7) penetrates through the filter screen (3), the threaded rod (7) is slidably sleeved with a connecting block (11), the connecting block (11) is fixedly connected with a connecting rod (17), the connecting rod (17) is rotatably connected with a cleaning plate one (13), the connecting rod (17) and the cleaning plate one (13) are fixedly connected with a torsion spring (15), the cleaning plate one (13) is fixedly installed with a spring two (16), the spring two (16) is fixedly connected with a cleaning plate two (14), the shell (1) is fixedly installed with a mounting bracket, the mounting bracket is fixedly installed with a motor (4), the output end of the motor (4) is fixedly installed with a rotating shaft (5), and the rotating shaft (5) is fixedly connected with the impeller cylinder (2).

2. A silent centrifugal fan according to claim 1, characterized in that The threaded rod (7) is fixedly sleeved with a fixed plate (9), the connecting block (11) and the fixed plate (9) are fixedly connected with a spring one (10), the threaded rod (7) is slidably sleeved with a sleeve (12), the sleeve (12) extends to the outside of the threaded rod (7) and is fixedly connected with a pressing plate, and the sleeve (12) is fixedly connected with the connecting block (11).

3. A silent centrifugal fan according to claim 1, characterized in that The threaded rod (7) is installed at the center of the filter screen (3), the side wall of the threaded rod (7) is fixedly connected with a swivel (8), and the outer side of the swivel (8) is wrapped with a rubber layer.

4. The silent centrifugal fan according to claim 1, wherein The filter screen (3) is in the shape of "concave" as a whole, and the side wall and the front of the filter screen (3) are both provided with filter holes.

5. The silent centrifugal fan according to claim 1, wherein The cleaning surfaces of the cleaning plate one (13) and the cleaning plate two (14) are in arc-shaped structure.

6. A silent centrifugal fan according to claim 1, characterized in that The material of the impeller on the impeller cylinder (2) is high-strength engineering plastic.

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