Low-noise centrifugal fan

Abstract

The utility model relates to the technical field of centrifugal fans, in particular to a low-noise centrifugal fan which comprises a centrifugal fan body, a transverse plate is fixedly arranged at the bottom of the centrifugal fan body, connecting plates are fixedly connected to the four corners of the lower surface of the transverse plate, a bottom plate is arranged below the transverse plate, and shells are fixedly connected to the four corners of the upper surface of the bottom plate. During working, the connecting block is locked by means of matching of the mounting hole and an external screw, so that the centrifugal fan is fixed, when vibration generated during working of the centrifugal fan main body is transmitted to the connecting plate and the shell, damping force between the viscous body and the connecting plate is utilized to absorb vibration force, and the vibration force is absorbed by matching with the rubber column, so that the vibration force is reduced. According to the low-noise centrifugal fan, the motor noise can be reduced, the contact area between the motor noise and the viscous body is increased through the arrangement of the baffle plates, the damping force can be improved, the noise generated during air outlet can be absorbed through the sound absorption cotton, the noise reduction effect is further improved, the low-noise centrifugal fan is formed, noise pollution is reduced, and convenience is brought to use of the centrifugal fan.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifugal fans, in particular to a low-noise centrifugal fan. Background Art

[0002] A centrifugal fan is a machine that relies on input mechanical energy to increase gas pressure and discharge gas. It is a driven fluid machine. Centrifugal fans are widely used in ventilation, dust removal and cooling of factories, mines, tunnels, cooling towers, vehicles, ships and buildings, ventilation and draft of boilers and industrial furnaces, cooling and ventilation of air conditioning equipment and household appliances, drying and selection of grains, wind tunnel wind source and inflation and propulsion of hovercraft, etc. Centrifugal fans are based on the principle of converting kinetic energy into potential energy. They use a high-speed rotating impeller to accelerate the gas, then decelerate and change the flow direction to convert kinetic energy into potential energy. In a single-stage centrifugal fan, the gas enters the impeller from the axial direction, changes to the radial direction when passing through the impeller, and then enters the diffuser. In the diffuser, the gas changes the flow direction and the cross-sectional area of ​​the pipe increases to decelerate the airflow. This deceleration effect converts kinetic energy into pressure energy. The pressure increase mainly occurs in the impeller, and secondly in the expansion process. In a multi-stage centrifugal fan, a returner is used to allow the airflow to enter the next impeller to generate higher pressure;

[0003] The main sources of noise generated by centrifugal fans when they are working are motor noise, pneumatic noise, etc. These noises will cause noise pollution to the surrounding environment and also harm the health of workers. Therefore, how to reduce noise is one of the problems that need to be solved in the use of centrifugal fans. For this reason, a low-noise centrifugal fan is proposed. Utility Model Content

[0004] The purpose of the utility model is to provide a low-noise centrifugal fan to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a low-noise centrifugal fan, comprising a centrifugal fan body, a transverse plate fixedly provided at the bottom of the centrifugal fan body, a connecting plate fixedly connected to the four corners of the lower surface of the transverse plate, a bottom plate provided below the transverse plate, a shell fixedly connected to the four corners of the upper surface of the bottom plate, a cavity provided inside the shell, the connecting plate slides on the upper surface of the shell, the bottom end of the connecting plate extends into the inside of the cavity, a viscous body is provided inside the cavity, a rubber column is evenly fixedly connected to the lower surface of the transverse plate, and the bottom end of the rubber column is fixedly connected to the bottom of the rubber column. The centrifugal fan body is fixedly connected to the upper surface of the bottom plate, the front surface of the centrifugal fan body is provided with an air outlet, the front surface of the air outlet is connected with a noise reduction cover, and the inner side wall of the noise reduction cover is fixedly connected with sound-absorbing cotton; the centrifugal fan body adopts the existing technology, and is equipped with a casing, a main shaft, an impeller, a bearing transmission mechanism and a motor and other structures. When the vibration generated by the operation of the centrifugal fan body is transmitted to the connecting plate and the casing, the damping force between the viscous body and the connecting plate is used to absorb the vibration force, and the rubber column is used to absorb the vibration force, so that the motor noise can be reduced, and the noise during air outlet can be absorbed with the help of sound-absorbing cotton, thereby further improving the noise reduction effect.

[0006] As a further preferred embodiment of the present technical solution: a movable block is evenly and fixedly connected to the rear side of the outer side wall of the noise reduction cover.

[0007] As a further preferred embodiment of the present technical solution: a connecting bolt is connected between the movable block and the air outlet, thereby realizing a detachable connection between the noise reduction cover and the air outlet.

[0008] As a further preferred embodiment of the present technical solution: the outer side wall of the connecting plate is evenly and fixedly connected with a blocking plate.

[0009] As a further preferred embodiment of the technical solution: the outer side wall of the transverse plate is evenly and fixedly connected with a connecting block.

[0010] As a further preferred embodiment of the present technical solution: a mounting hole is provided on the lower surface of the connection block; the connection block can be locked by means of the mounting hole and external screws.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] When the utility model is working, the connecting block is locked with the help of the mounting hole and the external screw, so as to fix the centrifugal fan. When the vibration generated by the operation of the centrifugal fan main body is transmitted to the connecting plate and the shell, the damping force between the viscous body and the connecting plate is used to absorb the vibration force, and the vibration force is absorbed by the rubber column, so that the motor noise can be reduced. The setting of the baffle plate increases the contact area with the viscous body, which can improve the damping force, and the noise during air outlet can be absorbed with the help of sound-absorbing cotton, so as to further improve the noise reduction effect, thus forming a low-noise centrifugal fan, reducing noise pollution, and bringing convenience to the use of the centrifugal fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0014] Figure 2 This is a schematic diagram of the structure of the utility model when viewed from above;

[0015] Figure 3 It is a partial cross-sectional structural schematic diagram of the utility model;

[0016] Figure 4 For the utility model Figure 3 A magnified view of the structure of area A;

[0017] Figure 5 It is a structural schematic diagram of the noise reduction cover and the sound-absorbing cotton in the utility model.

[0018] In the figure: 1. Centrifugal fan body; 2. Horizontal plate; 3. Connecting plate; 4. Bottom plate; 5. Shell; 6. Cavity; 7. Viscous body; 8. Rubber column; 9. Air outlet; 10. Noise reduction cover; 11. Sound-absorbing cotton; 12. Movable block; 13. Connecting bolt; 14. Baffle; 15. Connecting block; 16. Mounting hole. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present application, and cannot be understood as limitations on the present application. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0020] See also Figure 1-5The utility model provides a technical solution: a low-noise centrifugal fan comprises a centrifugal fan body 1, a horizontal plate 2 is fixedly arranged at the bottom of the centrifugal fan body 1, a connecting plate 3 is fixedly connected to the four corners of the lower surface of the horizontal plate 2, a bottom plate 4 is arranged below the horizontal plate 2, a shell 5 is fixedly connected to the four corners of the upper surface of the bottom plate 4, a cavity 6 is opened inside the shell 5, the connecting plate 3 slides on the upper surface of the shell 5, the bottom end of the connecting plate 3 extends into the cavity 6, a viscous body 7 is arranged inside the cavity 6, a rubber column 8 is evenly fixedly connected to the lower surface of the horizontal plate 2, and the bottom end of the rubber column 8 is fixedly connected to the upper surface of the bottom plate 4 An air outlet 9 is provided on the front surface of the centrifugal fan body 1, and a noise reduction cover 10 is connected to the front surface of the air outlet 9, and a sound-absorbing cotton 11 is fixedly connected to the inner wall of the noise reduction cover 10; the centrifugal fan body 1 adopts the existing technology and is equipped with a casing, a main shaft, an impeller, a bearing transmission mechanism and a motor and other structures. When the vibration generated by the operation of the centrifugal fan body 1 is transmitted to the connecting plate 3 and the shell 5, the damping force between the viscous body 7 and the connecting plate 3 is used to absorb the vibration force, and the rubber column 8 is used to absorb the vibration force, so that the motor noise can be reduced, and the noise during the air outlet can be absorbed with the help of the sound-absorbing cotton 11, thereby further improving the noise reduction effect.

[0021] In this embodiment, specifically: the rear side of the outer wall of the noise reduction cover 10 is evenly and fixedly connected with a movable block 12 .

[0022] In this embodiment, specifically: a connecting bolt 13 is connected between the movable block 12 and the air outlet 9; with the help of the connecting bolt 13 and the movable block 12, a detachable connection between the air outlet 9 and the noise reduction cover 10 can be achieved, so that the noise reduction cover 10 can be removed to replace the sound-absorbing cotton 11.

[0023] In this embodiment, specifically: the outer wall of the connecting plate 3 is evenly and fixedly connected with a blocking plate 14; the setting of the blocking plate 14 increases the contact area between the blocking plate 14 and the viscous body 7, which can improve the damping force.

[0024] In this embodiment, specifically: the outer side wall of the transverse plate 2 is evenly and fixedly connected with the connecting block 15 , so that the connecting block 15 and the transverse plate 2 can keep moving synchronously.

[0025] In this embodiment, specifically: a mounting hole 16 is provided on the lower surface of the connection block 15; the connection block 15 can be locked by means of the mounting hole 16 and an external screw, thereby fixing the centrifugal fan.

[0026] The working principle of the utility model is: the connecting block 15 can be locked by means of the mounting hole 16 and the external screw, so as to fix the centrifugal fan. When the vibration generated by the operation of the centrifugal fan main body 1 is transmitted to the connecting plate 3 and the housing 5, the damping force between the viscous body 7 and the connecting plate 3 is utilized to absorb the vibration force, and the vibration force is absorbed by the rubber column 8, so as to reduce the motor noise. The setting of the baffle plate 14 increases the contact area with the viscous body 7, so as to improve the damping force. The noise during the air outlet can be absorbed by the sound-absorbing cotton 11, so as to further improve the noise reduction effect, thereby forming a low-noise centrifugal fan, reducing noise pollution, and bringing convenience to the use of the centrifugal fan.

[0027] 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 low-noise centrifugal fan, comprising a centrifugal fan body (1), characterized in that: A transverse plate (2) is fixedly provided at the bottom of the centrifugal fan body (1), and connecting plates (3) are fixedly connected to the four corners of the lower surface of the transverse plate (2). A bottom plate (4) is provided below the transverse plate (2), and a shell (5) is fixedly connected to the four corners of the upper surface of the bottom plate (4). A cavity (6) is provided inside the shell (5), and the connecting plate (3) slides on the upper surface of the shell (5). The bottom end of the connecting plate (3) extends into the cavity (6). A viscous body (7) is provided inside the cavity (6). A rubber column (8) is evenly fixedly connected to the lower surface of the transverse plate (2), and the bottom end of the rubber column (8) is fixedly connected to the upper surface of the bottom plate (4). An air outlet (9) is provided on the front surface of the centrifugal fan body (1), and a noise reduction cover (10) is connected to the front surface of the air outlet (9). The inner wall of the noise reduction cover (10) is fixedly connected to sound-absorbing cotton (11).

2. The low noise centrifugal fan according to claim 1, characterized in that: A movable block (12) is evenly and fixedly connected to the rear side of the outer side wall of the noise reduction cover (10).

3. The low noise centrifugal fan according to claim 2, characterized in that: A connecting bolt (13) is connected between the movable block (12) and the air outlet (9).

4. The low noise centrifugal fan according to claim 3, characterized in that: The outer side wall of the connecting plate (3) is evenly and fixedly connected with a blocking plate (14).

5. The low noise centrifugal fan according to claim 4, characterized in that: The outer side wall of the transverse plate (2) is evenly and fixedly connected with a connecting block (15).

6. The low noise centrifugal fan according to claim 5, characterized in that: The lower surface of the connecting block (15) is provided with a mounting hole (16).

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