A DC fan with noise reduction function

Abstract

The present invention belongs to the technical field of DC fans, and specifically relates to a DC fan with a sound-absorbing and noise-reducing function, comprising a fan mounting box, an air outlet duct, a cover plate, a fastening screw, a fan, and a self-cleaning sound-absorbing and noise-reducing mechanism. The side end of the fan mounting box is provided with an air outlet duct connected to its inner cavity, one side of the fan mounting box is an opening, a fastening protrusion with a fastening hole is installed on the fan mounting box near the opening, the cover plate is fixedly connected to the fastening protrusion by a fastening screw, a side plate of the fan mounting box is provided with a rotating hole for facilitating the rotation of the fan shaft, an air inlet is provided on the cover plate, and the inner cavity of the fan mounting box is provided with a self-cleaning sound-absorbing and noise-reducing mechanism located on the inner side of the fastening protrusion. The present invention further includes a self-cleaning sound-absorbing and noise-reducing mechanism inside. On the basis of providing the sound-absorbing and noise-reducing function, the self-cleaning sound-absorbing and noise-reducing mechanism can also realize a self-cleaning function to prevent internal dust accumulation.

Description

Technical Field

[0001] The present invention belongs to the technical field of DC fans, and in particular relates to a DC fan with silencing and noise reduction functions. Background Art

[0002] A DC fan is one that converts DC power into mechanical energy by rotating a DC motor through input DC power, which in turn drives the fan impeller. A key feature of a DC fan is its DC motor. This permanent magnet excitation eliminates the losses caused by the excitation current of an induction motor. Furthermore, the permanent magnet brushless DC motor operates in synchronous mode, eliminating the frequency losses of the induction motor's rotor core. These two factors make the permanent magnet brushless DC motor far more efficient than an induction motor, with the efficiency improvement being even more pronounced for smaller motors. While DC fans are widely used, the rotating blades of these fans generate considerable noise, significantly impacting the working environment.

[0003] To this end, the patent specification with publication number CN212643118U discloses a DC fan with a sound-absorbing and noise-reducing function, including a housing, a first fixed head fixedly connected to the inner bottom end of the housing, a first sound-absorbing mechanism fixedly connected to one side of the first fixed head, the first sound-absorbing mechanism including a filter screen, one end of the filter screen fixedly connected to the first fixed head, the other end of the filter screen connected to a second fixed head, both sides of the filter screen connected to a second sound-absorbing cotton layer, each second sound-absorbing cotton layer is connected to a mesh layer on one side, the second fixed head fixedly connected to one side of the second sound-absorbing mechanism, the second sound-absorbing mechanism fixedly connected to one side of a third fixed head, and the third fixed head fixedly connected to one side of a third sound-absorbing mechanism. The second sound-absorbing cotton layer absorbs noise, and at the same time, the second and third sound-absorbing mechanisms absorb noise generated by the rotation of the blades, thereby reducing the amount of noise generated by the operation of the DC fan and achieving a good noise reduction effect.

[0004] However, this DC fan with noise reduction function still has some shortcomings. Its internal sound absorption and noise reduction mechanism does not have a self-cleaning function, is prone to dust accumulation, and is difficult to clean. Therefore, it needs to be optimized and improved. Summary of the Invention

[0005] The purpose of the present invention is to overcome the above-mentioned problems existing in the traditional technology and provide a DC fan with noise reduction function.

[0006] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions:

[0007] A DC fan with a sound-absorbing and noise-reduction function comprises a fan mounting box, an air outlet duct, a cover plate, a fastening screw, a fan and a self-cleaning sound-absorbing and noise-reduction mechanism, wherein the side end of the fan mounting box is provided with an air outlet duct connected to its inner cavity, one side of the fan mounting box is an opening, and a fastening protrusion with a fastening hole is installed on the fan mounting box near the opening, the cover plate is fixedly connected to the fastening protrusion by a fastening screw, a side plate of the fan mounting box is provided with a rotating hole for facilitating the rotation of the fan shaft, an air inlet hole is provided on the cover plate, and the inner cavity of the fan mounting box is provided with a self-cleaning sound-absorbing and noise-reduction mechanism in the inner area of ​​the fastening protrusion.

[0008] Furthermore, in the above-mentioned DC fan with sound absorbing and noise reduction function, the self-cleaning sound absorbing and noise reduction mechanism includes a curved sound absorbing seat, a curved cover plate, a water inlet pipe and a water outlet pipe. The opening position of the curved sound absorbing seat cooperates with the port position in the air outlet duct. A sound absorbing cavity is provided inside the curved sound absorbing seat, and the sound absorbing cavity is connected with the water inlet pipe and the water outlet pipe. A curved cover plate is slidably installed on the inner side of the curved sound absorbing seat, and a plurality of rows of sound absorbing holes connected with the sound absorbing cavity are provided on the curved cover plate.

[0009] Furthermore, in the above-mentioned DC fan with sound absorbing and noise reduction functions, the sound absorbing chamber includes an axial transverse groove portion, an arcuate connecting groove portion and an arcuate return groove portion. The axial transverse groove portion is evenly distributed along the direction of the arcuate sound absorbing seat. Two adjacent axial transverse groove portions are connected through the arcuate connecting groove portion. The connected arcuate connecting groove portions on the same axial transverse groove portion are located at different ends. The outermost axial transverse groove portion is connected to the water inlet pipe, and the other outermost axial transverse groove portion is connected to the water outlet pipe through the arcuate return groove portion.

[0010] Furthermore, in the above-mentioned DC fan with sound-absorbing and noise-reducing functions, the self-cleaning sound-absorbing and noise-reducing mechanism also includes a push block, a toggle motor and a toggle block. A push block is fixed to the outer side of the arc-shaped cover plate, and a toggle motor is embedded and fixed in the arc-shaped sound-absorbing seat. Two toggle blocks are installed at the output end of the toggle motor.

[0011] Furthermore, in the above-mentioned DC fan with the sound absorbing and noise reduction function, when the toggle motor rotates in the forward direction, the first toggle block is used to drive the push block and the arc-shaped cover plate to move to the first position, at which time each row of sound-absorbing holes on the arc-shaped cover plate and the corresponding axial transverse groove portion in the sound-absorbing cavity are connected to each other; when the toggle motor rotates in the reverse direction, the second toggle block is used to drive the push block and the arc-shaped cover plate to move to the second position, at which time each row of sound-absorbing holes on the arc-shaped cover plate and the corresponding axial transverse groove portion in the sound-absorbing cavity are staggered with each other.

[0012] Furthermore, in the above-mentioned DC fan with the function of silencing and reducing noise, an arc-shaped sliding groove is provided on the inner side of the arc-shaped sound-absorbing seat to facilitate the sliding of the arc-shaped cover plate.

[0013] Furthermore, in the above-mentioned DC fan with the function of silencing and reducing noise, the cross section of the arc-shaped slide groove is a rectangle or a T-shaped structure that is narrow inside and wide outside.

[0014] Furthermore, in the above-mentioned DC fan with silencing and noise reduction function, the fan installation box is provided with a through hole for the water inlet pipe and the water outlet pipe to pass through.

[0015] The beneficial effects of the present invention are:

[0016] The structure of the present invention is reasonably designed, and a self-cleaning sound-absorbing and noise-reduction mechanism is added inside. The self-cleaning sound-absorbing and noise-reduction mechanism is mainly composed of an arc-shaped sound-absorbing seat, an arc-shaped cover plate, a water inlet pipe, a water outlet pipe, a push block, a toggle motor and a toggle block. The interior of the arc-shaped sound-absorbing seat is provided with a sound-absorbing cavity composed of an axial transverse groove portion, an arc-shaped connecting groove portion and an arc-shaped reflux groove portion. The arc-shaped cover plate is provided with multiple rows of sound-absorbing holes connected with the corresponding axial transverse groove portions. When sound absorption and noise reduction are required, the sound-absorbing holes are kept connected with the corresponding axial transverse groove portions; when internal dust cleaning is required, the sound-absorbing holes are staggered with the corresponding axial transverse groove portions by utilizing the cooperation of the push block, the toggle motor and the toggle block, and then water is supplied to the sound-absorbing cavity by utilizing the water inlet pipe. The dust can be cleaned during the flow of water, and the cleaned waste water is discharged by utilizing the water outlet pipe, thereby achieving self-cleaning.

[0017] Of course, any product implementing the present invention does not necessarily need to achieve all of the above advantages at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a schematic structural diagram of the present invention as a whole;

[0020] Figure 2 This is a schematic diagram of the structure separation after omitting the fan of the present invention;

[0021] Figure 3 Schematic diagram of the structure of the self-cleaning sound absorption and noise reduction mechanism of the present invention;

[0022] Figure 4 Schematic diagram of the structure of the arc cover plate in the present invention;

[0023] Figure 5 Schematic diagram of the sliding principle of the arc-shaped cover plate in the present invention;

[0024] Figure 6 Schematic diagram of the composition of the sound absorbing cavity in the present invention;

[0025] In the accompanying drawings, the reference numerals of the various components are as follows:

[0026] 1-fan installation box, 2-air outlet duct, 3-cover plate, 4-fastening screw, 5-fan, 6-air inlet, 7-rotating hole, 8-fastening protrusion, 9-arc-shaped sound-absorbing seat, 901-axial transverse groove, 902-arc-shaped connecting groove, 903-arc-shaped return groove, 10-arc-shaped cover plate, 11-sound-absorbing hole, 12-switching motor, 13-water inlet pipe, 14-water outlet pipe, 15-push block, 16-switching block. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0028] See also Figures 1-6 As shown, this embodiment is a DC fan with a sound-absorbing and noise-reducing function, comprising a fan mounting box 1, an air outlet duct 2, a cover plate 3, a fastening screw 4, a fan 5, and a self-cleaning sound-absorbing and noise-reducing mechanism. The side end of the fan mounting box 1 is provided with an air outlet duct 2 connected to its inner cavity. One side of the fan mounting box 1 is an opening. A fastening protrusion 8 with a fastening hole is installed near the opening of the fan mounting box 1. The cover plate 3 is fixedly connected to the fastening protrusion 8 by the fastening screw 4. A rotating hole 7 is provided on one side panel of the fan mounting box 1 to facilitate the rotation of the rotating shaft of the fan 5, and an air inlet hole 6 is provided on the cover plate 3. A self-cleaning sound-absorbing and noise-reducing mechanism is installed in the inner area of ​​the fastening protrusion 8 of the inner cavity of the fan mounting box 1.

[0029] In this embodiment, the self-cleaning sound-absorbing and noise-reducing mechanism includes a curved sound-absorbing seat 9, a curved cover plate 10, a water inlet pipe 13 and a water outlet pipe 14. The opening position of the curved sound-absorbing seat 9 cooperates with the port position in the air outlet duct 2. A sound-absorbing cavity is provided inside the curved sound-absorbing seat 9, and the sound-absorbing cavity is connected to the water inlet pipe 13 and the water outlet pipe 14. A curved cover plate 10 is slidably installed on the inner side of the curved sound-absorbing seat 9, and a plurality of rows of sound-absorbing holes 11 connected to the sound-absorbing cavity are provided on the curved cover plate 10.

[0030] In this embodiment, the sound absorbing cavity includes an axial transverse groove portion 901, an arcuate connecting groove portion 902 and an arcuate reflux groove portion 903. The axial transverse groove portion 901 is evenly distributed along the direction of the arcuate sound absorbing seat 9. Two adjacent axial transverse groove portions 901 are connected through the arcuate connecting groove portion 902. The connected arcuate connecting groove portions 902 on the same axial transverse groove portion 901 are located at different ends. The outermost axial transverse groove portion 901 is connected to the water inlet pipe 13, and the outermost axial transverse groove portion 901 is connected to the water outlet pipe 14 through the arcuate reflux groove portion 903.

[0031] In this embodiment, the self-cleaning sound absorption and noise reduction mechanism further includes a push block 15, a toggle motor 12, and a toggle block 16. The push block 15 is fixed to the outside of the curved cover plate 10, and the toggle motor 12 is embedded and fixed in the curved sound absorbing base 9. Two toggle blocks 16 are mounted on the output end of the toggle motor 12. When the toggle motor 12 rotates in the forward direction, the first toggle block drives the push block 15 and the curved cover plate 10 to move to the first position, at which point each row of sound-absorbing holes 11 on the curved cover plate 10 communicates with the corresponding axial transverse groove portion 901 in the sound absorption cavity. When the toggle motor 12 rotates in the reverse direction, the second toggle block drives the push block 15 and the curved cover plate 10 to move to the second position, at which point each row of sound-absorbing holes 11 on the curved cover plate 10 is staggered with the corresponding axial transverse groove portion 901 in the sound absorption cavity.

[0032] In this embodiment, an arc-shaped slide groove is provided on the inner side of the arc-shaped sound absorbing seat 9 to facilitate the sliding of the arc-shaped cover plate 10. The cross section of the arc-shaped slide groove is a rectangular structure or a T-shaped structure with a narrow inner side and a wide outer side.

[0033] In this embodiment, the fan installation box 1 is provided with holes for the water inlet pipe 13 and the water outlet pipe 14 to pass through.

[0034] A specific application of this embodiment is that a self-cleaning sound absorption and noise reduction mechanism is added inside. The self-cleaning sound absorption and noise reduction mechanism is mainly composed of a curved sound absorbing seat 9, a curved cover plate 10, a water inlet pipe 13, a water outlet pipe 14, a push block 15, a toggle motor 12 and a toggle block 16. The interior of the curved sound absorbing seat 9 is provided with a sound absorption cavity composed of an axial transverse groove portion 901, an arc-shaped connecting groove portion 902 and an arc-shaped reflux groove portion 903. The curved cover plate 10 is provided with multiple rows of sound absorbing chambers corresponding to the axial transverse groove portion 901. 1 is connected to the sound-absorbing hole 11. When sound absorption and noise reduction are required, the sound-absorbing hole 11 is kept connected to the corresponding axial transverse groove portion 901. When internal dust needs to be cleaned, the sound-absorbing hole 11 and the corresponding axial transverse groove portion 901 are staggered by using the push block 15, the toggle motor 12 and the toggle block 16. Then, water is supplied to the sound-absorbing cavity through the water inlet pipe 13. The dust can be cleaned during the flow of water, and the cleaned waste water is discharged through the water outlet pipe 14. In this way, self-cleaning is achieved.

[0035] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A DC fan with noise reduction function, characterized by: The invention comprises a fan mounting box, an air outlet duct, a cover plate, a fastening screw, a fan and a self-cleaning sound absorption and noise reduction mechanism, wherein the side end of the fan mounting box is provided with an air outlet duct connected to its inner cavity, one side of the fan mounting box is an opening, a fastening protrusion with a fastening hole is installed on the fan mounting box near the opening, the cover plate is fixedly connected to the fastening protrusion by a fastening screw, a side plate of the fan mounting box is provided with a rotating hole for facilitating the rotation of the fan shaft, an air inlet hole is provided on the cover plate, and the inner cavity of the fan mounting box is provided with a self-cleaning sound absorption and noise reduction mechanism in the inner area of ​​the fastening protrusion; The self-cleaning sound-absorbing and noise-reducing mechanism includes a curved sound-absorbing seat, a curved cover plate, a water inlet pipe, and a water outlet pipe. The opening position of the curved sound-absorbing seat matches the position of the port in the air outlet duct. A sound-absorbing cavity is provided inside the curved sound-absorbing seat, and the sound-absorbing cavity is connected to the water inlet pipe and the water outlet pipe. A curved cover plate is slidably mounted on the inner side of the curved sound-absorbing seat, and a plurality of rows of sound-absorbing holes are provided on the curved cover plate, which are connected to the sound-absorbing cavity. The self-cleaning sound absorption and noise reduction mechanism also includes a push block, a toggle motor and a toggle block. The push block is fixed to the outer side of the arc-shaped cover plate, the toggle motor is embedded and fixed in the arc-shaped sound-absorbing seat, and two toggle blocks are installed at the output end of the toggle motor. When the toggle motor rotates forward, the first toggle block drives the push block and the arc-shaped cover plate to move to the first position, at which time each row of sound-absorbing holes on the arc-shaped cover plate is connected to the corresponding axial transverse groove portion in the sound-absorbing cavity; when the toggle motor rotates reversely, the second toggle block drives the push block and the arc-shaped cover plate to move to the second position, at which time each row of sound-absorbing holes on the arc-shaped cover plate is staggered with the corresponding axial transverse groove portion in the sound-absorbing cavity.

2. The DC fan with noise reduction function according to claim 1, characterized in that: The sound absorbing cavity includes an axial transverse groove portion, an arcuate connecting groove portion, and an arcuate reflux groove portion. The axial transverse groove portion is evenly distributed along the direction of the arcuate sound absorbing seat. Two adjacent axial transverse groove portions are connected through the arcuate connecting groove portion. The connected arcuate connecting groove portions on the same axial transverse groove portion are located at different ends. The outermost axial transverse groove portion is connected to the water inlet pipe, and the other outermost axial transverse groove portion is connected to the water outlet pipe through the arcuate reflux groove portion.

3. The DC fan with noise reduction function according to claim 2, characterized in that: An arc-shaped sliding groove is provided on the inner side of the arc-shaped sound-absorbing seat to facilitate the sliding of the arc-shaped cover plate.

4. The DC fan with noise reduction function according to claim 3 is characterized in that: The cross section of the arc-shaped chute is a rectangle or a T-shaped structure that is narrow inside and wide outside.

5. The DC fan with noise reduction function according to claim 4 is characterized in that: The fan installation box is provided with holes for the water inlet pipe and the water outlet pipe to pass through.

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