Low-noise centrifugal fan

Abstract

The utility model relates to the technical field of centrifugal fans, and discloses a low-noise centrifugal fan which comprises a bottom plate, a base is fixedly connected to the upper end of the bottom plate, a support is fixedly connected to the upper end of the base, a motor is fixedly connected to the upper end of the support, and two supporting frames are fixedly connected to the upper end of the bottom plate; the upper ends of the two supporting frames are fixedly connected with a volute. According to the low-noise centrifugal fan, the sound insulation pad is arranged in the volute, sound generated by high-speed friction between the impeller and airflow is reduced, noise reduction is conducted from the source, gas is exhausted from the air outlet pipe, sound insulation cotton is arranged in the air outlet pipe, secondary noise reduction is conducted on the noise generated by gas exhaust, and therefore noise reduction is conducted on the interior of the centrifugal machine; meanwhile, the sound insulation box is arranged outside the whole device, sound insulation is conducted on the whole motor, and noise is reduced to the minimum as much as possible.

Description

Technical Field

[0001] The present application relates to the technical field of centrifugal fans, and 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 in air conditioning equipment and household appliances; drying and selection of grains; inflation and propulsion of wind tunnel wind sources and hovercraft, etc. In a single-stage centrifugal fan, the gas enters the impeller from the axial direction, changes to radial 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 slow down 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] An existing patent (publication number: CN215566743U) discloses a low-noise centrifugal fan, including a volute, a motor, a wind wheel and a muffler, wherein the wind wheel is rotatably connected in the volute, the output shaft of the motor passes through the volute and is concentrically connected to the wind wheel, the muffler is detachably mounted at the air inlet and the air outlet of the volute, respectively, the muffler includes a cylinder and a muffler cotton sheet, one end of the cylinder is detachably connected to the air inlet or the air outlet of the volute, the other end of the cylinder is provided with a first annular groove, the muffler cotton sheet is rolled into a cylindrical shape and inserted into the first annular groove.

[0004] The above-mentioned comparative document points out that the utility model can adjust the silencing intensity by detachably installing silencers at the air inlet and air outlet of the volute, and can select the appropriate length of silencer according to needs. The structure is simple and the installation is convenient. However, the centrifugal fan is based on the principle of converting kinetic energy into potential energy. It uses a high-speed rotating impeller to accelerate the gas, and then slows down and changes the flow direction to convert kinetic energy into potential energy. A lot of noise will be generated during the operation of the centrifuge. If the air inlet and air outlet of the centrifuge are simply silenced with silencer cotton sheets, the silencing result is not ideal, and the device ignores the noise generated by the motor startup. The noise generated by the motor is also one of the noises of the centrifugal fan and also needs to be silenced. Utility Model Content

[0005] In view of the shortcomings of the prior art, the present application provides a low-noise centrifugal fan with advantages such as low noise, and solves the problem that the centrifugal fan is based on the principle of converting kinetic energy into potential energy, and uses a high-speed rotating impeller to accelerate the gas, and then decelerate and change the flow direction to convert kinetic energy into potential energy. A lot of noise will be generated during the operation of the centrifuge. If the air inlet and outlet pipe of the centrifuge are simply silenced with silencer cotton pieces, the silencer result is not ideal, and the device ignores the noise generated by the motor startup. The noise generated by the motor is also one of the noises of the centrifugal fan and also needs to be silenced.

[0006] To achieve the above-mentioned objectives, the present application provides the following technical solutions: a low-noise centrifugal fan, comprising a base plate, the upper end of the base plate is fixedly connected to a base, the upper end of the base is fixedly connected to a bracket, the upper end of the bracket is fixedly connected to a motor, the upper end of the base plate is fixedly connected to two support frames, the upper ends of the two support frames are fixedly connected to a volute, the surface of the volute is fixedly connected to an air outlet duct, the output end of the motor is fixedly connected to an impeller, one side of the volute is fixedly connected to an air inlet, the upper end of the base plate is fixedly connected to a sound insulation box, and both sides of the sound insulation box are fixedly connected to fixed blocks.

[0007] Through the above scheme, by arranging a soundproof box outside the entire device, the entire motor is soundproofed to minimize the noise.

[0008] Furthermore, first screws are slidably connected to the base on all four sides.

[0009] According to the above solution, the base is fixed by setting the first screw.

[0010] Furthermore, sound insulation cotton is fixedly connected to the inner wall of the air outlet pipe.

[0011] Through the above solution, the noise of the air outlet duct is reduced by setting sound insulation cotton.

[0012] Furthermore, a sound insulation pad is fixedly connected to the inner wall of the volute.

[0013] Through the above scheme, the noise inside the volute is reduced by arranging a sound insulation pad.

[0014] Furthermore, a filter screen is fixedly connected to one end of the air inlet.

[0015] According to the above scheme, the air inlet is filtered by setting a filter.

[0016] Furthermore, two screw holes are provided on the upper end of the bottom plate.

[0017] Through the above solution, the screw hole is provided to correspond to the second screw.

[0018] Furthermore, a plurality of heat dissipation holes are provided at the upper end of the sound insulation box.

[0019] According to the above solution, the heat dissipation holes are provided to dissipate heat from the motor.

[0020] Furthermore, the two fixing blocks are both slidably connected with a second screw, and the second screw passes through the fixing block and is threadedly connected with the screw hole.

[0021] Through the above solution, the second screw passes through the fixing block and is threadedly connected to the screw hole to fix the sound insulation box.

[0022] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0023] This low-noise centrifugal fan has a sound insulation pad inside the volute to reduce the sound of high-speed friction between the impeller and the airflow, thereby silencing the air at the source. The gas is discharged from the air outlet pipe, and the air outlet pipe is equipped with sound insulation cotton to perform secondary noise reduction on the noise of the gas discharge, thereby reducing the internal noise of the centrifuge. At the same time, a sound insulation box is provided on the outside of the entire device to soundproof the entire motor and minimize the noise as much as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the motor structure of this application;

[0025] Figure 2 This is a schematic diagram of the internal structure of the volute of this application;

[0026] Figure 3 This is a schematic diagram of the air inlet structure of this application;

[0027] Figure 4 This is a schematic diagram of the sound insulation box structure for this application;

[0028] Figure 5 This is a schematic diagram of the three-dimensional structure of the sound insulation box of this application.

[0029] In the figure:

[0030] 1. Bottom plate; 2. Base; 3. Bracket; 4. First screw; 5. Motor; 6. Support frame; 7. Volute; 8. Air outlet duct; 9. Sound insulation cotton; 10. Impeller; 11. Sound insulation pad; 12. Air inlet; 13. Filter; 14. Screw hole; 15. Sound insulation box; 16. Heat dissipation hole; 17. Fixing block; 18. Second screw. DETAILED DESCRIPTION

[0031] The following will be combined with the attached examples of the present application Figure 1 to Figure 5, the technical solutions in the embodiments of the present application are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0032] See also Figure 1 , Figure 2 and Figure 4 A low-noise centrifugal fan in this embodiment includes a bottom plate 1, a base 2 is fixedly connected to the upper end of the bottom plate 1, a bracket 3 is fixedly connected to the upper end of the base 2, a motor 5 is fixedly connected to the upper end of the bracket 3, two support frames 6 are fixedly connected to the upper end of the bottom plate 1, a volute 7 is fixedly connected to the upper end of the two support frames 6, an air outlet pipe 8 is fixedly connected to the surface of the volute 7, an impeller 10 is fixedly connected to the output end of the motor 5, and the device is a style in which the motor 5 drives the impeller 10, a sound insulation box 15 is fixedly connected to the upper end of the bottom plate 1, and fixed blocks 17 are fixedly connected to both sides of the sound insulation box 15, and the bottom plate 1 is fixedly connected to the upper end of the bottom plate 1. Two screw holes 14 are opened at the end, and the screw holes 14 are set to correspond to the second screws 18. A plurality of heat dissipation holes 16 are opened at the upper end of the sound insulation box 15. The heat dissipation holes 16 are set to dissipate heat for the motor 5. The two fixing blocks 17 are slidably connected with the second screws 18 inside. The second screws 18 pass through the fixing blocks 17 and are threadedly connected to the screw holes 14. The second screws 18 pass through the fixing blocks 17 and are threadedly connected to the screw holes 14 to fix the sound insulation box 15. By arranging the sound insulation box 15 on the outside of the entire device, the entire motor 5 is soundproofed to minimize the noise as much as possible.

[0033] See also Figure 1 , Figure 2 and Figure 3 The base 2 is slidably connected with first screws 4 on all sides, and the base 2 is fixed by setting the first screws 4. The inner wall of the air outlet pipe 8 is fixedly connected with sound insulation cotton 9, and the noise of the air outlet pipe 8 is reduced by setting the sound insulation cotton 9. The inner wall of the volute 7 is fixedly connected with a sound insulation pad 11, and the noise inside the volute 7 is reduced by setting the sound insulation pad 11. An air inlet 12 is fixedly connected to one side of the volute 7, and a filter screen 13 is fixedly connected to one end of the air inlet 12, and the air inlet 12 is filtered by setting the filter screen 13.

[0034] In this embodiment, a sound insulation pad 11 is provided inside the volute 7 to reduce the sound of high-speed friction between the impeller 10 and the airflow, thereby eliminating noise from the source. The gas is discharged from the air outlet pipe 8, and the air outlet pipe 8 is equipped with sound insulation cotton 9 to perform secondary noise reduction on the noise of gas discharge, thereby reducing the internal noise of the centrifuge. At the same time, a sound insulation box 15 is provided outside the entire device to soundproof the entire motor 5 and minimize the noise as much as possible.

[0035] It should be noted that the device is of the type in which the motor 5 drives the impeller 10, and the sound insulation box 15 can be disassembled for use.

[0036] The working principle of the above embodiment is as follows: the device first starts the motor 5, and the output end of the motor 5 drives the impeller 10 to rotate, generating high air pressure inside the volute 7, so that air starts to enter the air inlet 12, and the air flow enters the volute 7. A sound insulation pad 11 is arranged inside the volute 7 to reduce the sound of high-speed friction between the impeller 10 and the air flow, and silence the sound from the source. The gas is discharged from the air outlet pipe 8, and the air outlet pipe 8 is equipped with sound insulation cotton 9 to perform secondary noise reduction on the noise of the gas discharge, thereby performing internal noise reduction on the centrifuge. At the same time, a sound insulation box 15 is arranged outside the entire device to soundproof the entire motor 5 and minimize the noise as much as possible.

[0037] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0038] Although the embodiments of the present application 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 application, and that the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A low-noise centrifugal fan, comprising a base plate (1), characterized in that: The upper end of the bottom plate (1) is fixedly connected to a base (2), the upper end of the base (2) is fixedly connected to a bracket (3), the upper end of the bracket (3) is fixedly connected to a motor (5), the upper end of the bottom plate (1) is fixedly connected to two support frames (6), and the upper ends of the two support frames (6) are fixedly connected to volutes (7); An air outlet pipe (8) is fixedly connected to the surface of the volute (7), an impeller (10) is fixedly connected to the output end of the motor (5), an air inlet (12) is fixedly connected to one side of the volute (7), a sound insulation box (15) is fixedly connected to the upper end of the bottom plate (1), and fixing blocks (17) are fixedly connected to both sides of the sound insulation box (15).

2. A low noise centrifugal fan according to claim 1, characterized in that: The base (2) is slidably connected to first screws (4) on all four sides.

3. A low noise centrifugal fan according to claim 1, characterized in that: The inner wall of the air outlet pipe (8) is fixedly connected with sound insulation cotton (9).

4. A low noise centrifugal fan according to claim 1, characterized in that: A sound insulation pad (11) is fixedly connected to the inner wall of the volute (7).

5. A low noise centrifugal fan according to claim 1, characterized in that: One end of the air inlet (12) is fixedly connected to a filter screen (13).

6. A low noise centrifugal fan according to claim 1, characterized in that: Two screw holes (14) are provided at the upper end of the bottom plate (1).

7. A low noise centrifugal fan according to claim 1, characterized in that: A plurality of heat dissipation holes (16) are provided at the upper end of the sound insulation box (15).

8. A low noise centrifugal fan according to claim 6, characterized in that: The two fixing blocks (17) are both slidably connected with a second screw (18) inside, and the second screw (18) passes through the fixing blocks (17) and is threadedly connected to the screw holes (14).

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