A low-noise ventilation device

Abstract

The present invention discloses a low-noise ventilation device, comprising a fan and a piping system. The fan comprises a housing (1), an impeller (2), a motor (3), and a flow guide (4). The housing comprises an upper shell plate (11) and a lower shell plate (12). The impeller comprises a chassis (21) and blades (22). The fan is a cross-flow fan, characterized in that a noise reduction structure is provided on the lower side of the chassis (21). The noise reduction structure comprises a plurality of recessed portions (23), each of which extends radially and comprises a plurality of arc-shaped recesses. The present invention can suppress turbulence in the impeller cavity, reduce fan noise, and adjust the wind performance of the fan.

Description

Technical Field

[0001] The present invention relates to the technical field of ventilation devices, and in particular to a low-noise ventilation device. Background Art

[0002] Ventilation systems are used in various applications requiring ventilation and air exchange, such as factories, homes, industrial equipment, and electrical installations. Ventilation systems primarily consist of fans and duct systems. Fans are categorized as centrifugal, axial, and cross-flow fans based on their fluid dynamics principles. However, existing cross-flow fans can be noisy during operation, leading to demands for improved wind performance and reduced noise levels. Summary of the Invention

[0003] The present invention aims to overcome the shortcomings of the prior art by providing a low-noise ventilation device. This device, through the design of a noise-reducing structure (recessed portion), suppresses turbulence within the impeller cavity and reduces fan noise. The design of a cavity adjustment portion allows the volume of the impeller cavity to be adjusted, thereby varying / adjusting the fan's wind performance, such as turbulence, wind speed, and wind pressure.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] A low-noise ventilation device comprises a fan and a piping system, wherein the fan comprises a housing (1), an impeller (2), a motor (3), and a guide portion (4), wherein the housing is generally rectangular in structure and comprises an upper housing plate (11) and a lower housing plate (12), wherein the impeller is mounted in a cavity between the upper housing plate and the lower housing plate, wherein the motor is mounted on the outer side of the upper housing plate, wherein the impeller is mounted on a rotating shaft of the motor, wherein one radial end of the housing comprises an air inlet (13) and the other radial end of the housing comprises an air outlet (14), wherein a guide portion connected to the inner side of the upper housing plate is provided between the air inlet and the impeller, wherein the impeller comprises a chassis (21) and blades (22), wherein a plurality of blades are uniformly distributed on the chassis along the circumferential direction, wherein the lower side of the chassis (21) comprises a noise reduction structure, wherein the noise reduction structure comprises a plurality of recessed portions (23), wherein each recessed portion extends radially, and each recessed portion comprises a plurality of arc-shaped recesses.

[0006] Furthermore, the extension line of each recessed portion (23) passes through the center of the impeller, and the arc-shaped recess is a circular recess or a hemispherical recess.

[0007] Furthermore, the arc-shaped recess has a diameter D, and the diameters D of the plurality of arc-shaped recesses gradually decrease from the center of the impeller (2) to the outer diameter side of the impeller.

[0008] Furthermore, the arc-shaped recess has an axial depth H, and the axial depth H of the plurality of arc-shaped recesses gradually decreases from the center of the impeller (2) to the outer diameter side of the impeller.

[0009] Furthermore, there is a spacing G between adjacent arc-shaped recesses, and the spacing G between the plurality of arc-shaped recesses gradually decreases from the center of the impeller (2) to the outer diameter side of the impeller.

[0010] Furthermore, the end of the blade (22) away from the chassis (21) is a free end; the guide portion (4) has an arc-shaped guide surface, and a contraction air flow channel is formed between the arc-shaped guide surface and the lower shell plate (12).

[0011] Furthermore, a circular hole (15) is provided in the middle portion of the lower shell plate (12), and a cavity adjustment portion (5) is installed in the circular hole. The cavity adjustment portion is located in the cavity surrounded by the blades (22), and the upper surface of the cavity adjustment portion is an inclined surface. The inclined surface has an angle a with the lower shell plate (12) or the horizontal line, and a=1-15°.

[0012] Furthermore, by varying the axial position at which the cavity adjustment portion (5) is embedded in the circular hole (15), the distance between the top end of the inclined surface and the lower side of the chassis (21) can be adjusted, thereby changing the volume of the cavity of the impeller (2).

[0013] Furthermore, the fan is a cross-flow fan.

[0014] The low-noise ventilation device of the present invention utilizes a noise-reducing structure (recessed portion) to suppress turbulence within the impeller cavity and reduce fan noise. The cavity adjustment portion allows the volume of the impeller cavity to be adjusted, thereby varying / adjusting the fan's wind performance (vortex, air volume, and air pressure). BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic structural diagram of the low-noise ventilation device of the present invention;

[0016] Figure 2 This is a schematic diagram of the structure of the impeller of the low-noise ventilation device of the present invention when viewed from above;

[0017] Figure 3 This is a schematic structural diagram of the low-noise ventilation device of the present invention.

[0018] In the figure: housing 1, impeller 2, motor 3, guide part 4, cavity adjustment part 5, upper shell plate 11, lower shell plate 12, air inlet 13, air outlet 14, circular hole 15, bottom plate 21, blades 22, recessed part 23. DETAILED DESCRIPTION

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0020] The present invention will be described in further detail below with reference to the accompanying drawings.

[0021] like Figure 1-3 As shown, a low-noise ventilation device includes a fan and a piping system. The fan includes a casing 1, an impeller 2, a motor 3, and a guide portion 4. The casing 1 is generally a rectangular structure (square or rectangular). The casing 1 includes an upper casing plate 11 and a lower casing plate 12. The impeller 2 is installed in a cavity between the upper casing plate 11 and the lower casing plate 12. The motor 3 is installed on the outside of the upper casing plate 11. The impeller 2 is installed on the rotating shaft of the motor 3. One radial end of the casing 1 has an air inlet 13, and the other radial end of the casing 1 has an air outlet 14. A guide portion 4 connected to the inner side of the upper casing plate 11 is provided between the air inlet 13 and the impeller 2. The impeller 2 includes a chassis 21 and blades 22. A plurality of blades 22 are evenly distributed on the chassis 21 along the circumferential direction. It is characterized in that: a noise reduction structure is provided on the lower side of the chassis 21. The noise reduction structure includes a plurality of recessed portions 23. Each recessed portion 23 extends radially, and each recessed portion 23 includes a plurality of arc-shaped recesses.

[0022] Furthermore, the extension line of each recessed portion 23 passes through the center of the impeller 2 , and the arc-shaped recess is a circular recess or a hemispherical recess (circular in cross section and hemispherical in three dimensions).

[0023] Furthermore, the arc-shaped recess has a diameter D, and the diameters D of the plurality of arc-shaped recesses gradually decrease from the center of the impeller 2 to the outer diameter side of the impeller.

[0024] Furthermore, the arc-shaped recess has an axial depth H, and the axial depth H of the plurality of arc-shaped recesses gradually decreases from the center of the impeller 2 to the outer diameter side of the impeller.

[0025] Furthermore, there is a spacing G between adjacent arc-shaped recesses, and the spacing G between the plurality of arc-shaped recesses gradually decreases from the center of the impeller 2 to the outer diameter side of the impeller.

[0026] The low-noise ventilation device of the present invention can suppress turbulence in the impeller cavity and reduce fan noise through the design of the noise reduction structure (recessed portion 23).

[0027] Furthermore, the end of the blade 22 away from the chassis 21 is a free end (not connected to any structure); the guide portion 4 has an arc-shaped guide surface, and a contraction air flow channel is formed between the arc-shaped guide surface and the lower shell plate 12, and the fan is a cross-flow fan.

[0028] Furthermore, a circular hole 15 is opened in the central or middle part of the lower shell plate 12, and a cavity adjustment portion 5 is installed in the circular hole 15. The cavity adjustment portion 5 is located in the cavity surrounded by the blades 22. The upper surface of the cavity adjustment portion 5 is an inclined surface, and an angle a is formed between the inclined surface and the lower shell plate 12 or the horizontal line, a=5-10°.

[0029] A low-noise ventilation device of the present invention can adjust the volume of the cavity of the impeller 2 through the design of the cavity adjustment part 5, thereby being able to change / adjust the wind performance of the fan, such as vortex, wind speed, and wind pressure.

[0030] Furthermore, by varying the axial position of the cavity adjustment portion 5 embedded in the circular hole 15, the distance between the top of the inclined surface and the lower side of the chassis 21 can be adjusted, thereby changing / adjusting the volume of the cavity of the impeller 2 and thereby changing / adjusting the wind performance (vortex, air volume, wind pressure) of the fan.

[0031] The low-noise ventilation device of the present invention utilizes a noise-reducing structure (recessed portion) to suppress turbulence within the impeller cavity and reduce fan noise. The cavity adjustment portion allows the volume of the impeller cavity to be adjusted, thereby varying / adjusting the fan's wind performance (vortex, wind speed, and wind pressure).

[0032] The above-mentioned embodiments are illustrative of the present invention, not limiting thereof. It is understood that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low-noise ventilation device, comprising a cross-flow fan and a duct system, wherein the fan comprises a housing (1), an impeller (2), and a motor (3), wherein the housing is generally rectangular in structure, comprises an upper shell plate (11), and a lower shell plate (12), wherein the impeller is mounted in a cavity between the upper shell plate and the lower shell plate, wherein the motor is mounted on the outer side of the upper shell plate, wherein the impeller is mounted on a rotating shaft of the motor, wherein one radial end of the housing has an air inlet (13), and the other radial end of the housing has an air outlet (14), wherein the impeller comprises a base plate (21), and blades (22), wherein a plurality of blades are evenly distributed on the base plate along the circumferential direction; It is characterized by : The lower side of the chassis is provided with a noise reduction structure, the noise reduction structure includes a plurality of recessed portions (23), the recessed portions are "M" shaped, each recessed portion extends radially, each recessed portion includes a plurality of arc-shaped recesses, and the extension line of each recessed portion passes through the center of the impeller; The arc-shaped depressions have a diameter D, and the diameters D of the multiple arc-shaped depressions gradually decrease from the center of the impeller to the outer diameter side of the impeller; the arc-shaped depressions have an axial depth H, and the axial depths H of the multiple arc-shaped depressions gradually decrease from the center of the impeller to the outer diameter side of the impeller; there is a spacing G between adjacent arc-shaped depressions, and the spacing G of the multiple arc-shaped depressions gradually decreases from the center of the impeller to the outer diameter side of the impeller; A circular hole (15) is provided in the middle of the lower shell plate, and a cavity adjustment portion (5) is installed in the circular hole. The cavity adjustment portion is located in the cavity surrounded by the blades. The upper surface of the cavity adjustment portion is an inclined surface, and an angle a is formed between the inclined surface and the lower shell plate or the horizontal line, where a=1-15°. By different axial positions of the cavity adjustment portion embedded in the circular hole, the distance between the top of the inclined surface and the lower side surface of the chassis can be adjusted, thereby changing the volume of the impeller cavity and adjusting the vortex characteristics of the fan.

2. A low-noise ventilation device according to claim 1, characterized in that: The arc-shaped depression is a hemispherical depression.

3. A low-noise ventilation device according to claim 1, characterized in that: The invention also includes a guide portion (4), which is provided between the air inlet and the impeller and is connected to the inner side of the upper shell plate. The end of the blade (22) away from the chassis (21) is a free end. The guide portion (4) has an arc-shaped guide surface, and a contraction air flow channel is formed between the arc-shaped guide surface and the lower shell plate (12).

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