exhaust vent silencer

Abstract

This utility model discloses an exhaust vent silencer, the outer shell of which includes a first upper shell and a first lower shell. The first upper shell is in the shape of a frustum with open top and bottom, and a second upper shell is disposed inside the first upper shell. The second upper shell is also in the shape of a frustum with open top and bottom, and its upper opening communicates with the interior of the first upper shell. The first lower shell is in the shape of an inverted frustum with open top and bottom, and a second lower shell is disposed inside the first lower shell. The second lower shell is connected to the second upper shell, and its upper opening communicates with the lower opening of the second upper shell. All four shells are made of galvanized sheet, and each has a silencing unit on its inner surface. This increases the sound wave reflection path and uses fiberglass wool and fiberglass cloth to absorb sound along the reflection path, greatly enhancing the silencing effect and thus significantly reducing noise.

Description

Technical Field

[0001] This utility model relates to the field of exhaust vent silencers, and in particular to an exhaust vent silencer. Background Technology

[0002] As the name suggests, an exhaust fan is used to exhaust air. It generally discharges air from a space to the outside, facilitating air exchange between the inside and outside of the space. When installed in some equipment, it can also help with heat dissipation.

[0003] Exhaust fans generate noise during operation. The continuous equivalent noise level of exhaust fan equipment must not exceed the range that the human body can tolerate as specified in national standards.

[0004] To reduce the noise generated by the exhaust fan, it is essential to install a noise reduction device at the location where the exhaust fan is used. Most existing noise reduction methods involve connecting a fan silencer to the exhaust outlet of the fan.

[0005] Existing fan silencers typically consist of a metal casing with an air inlet at one end, connected to an inlet flange, and an air outlet at the other end. Although sound-absorbing material is tightly attached to the inner wall of the casing, the interior is merely a strip-shaped cavity. Noise cannot be reflected within this cavity, resulting in poor noise reduction.

[0006] Therefore, in this utility model patent application, the applicant has carefully researched and developed an exhaust vent silencer to solve the above-mentioned problems. Utility Model Content

[0007] In view of this, the present invention addresses the deficiencies of the existing technology and its main purpose is to provide an exhaust vent silencer that increases the sound wave reflection path and sets fiberglass cotton and fiberglass cloth on the reflection path for sound absorption, thereby greatly enhancing the sound absorption effect and thus greatly reducing noise.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] An exhaust vent silencer includes a housing, the housing including a first upper housing and a first lower housing connected and communicating with each other, the first upper housing being a frustum shape with openings at the top and bottom, the upper opening of the first upper housing being an air outlet, and a second upper housing being disposed inside the first upper housing, the second upper housing being a frustum shape with openings at the top and bottom, the upper opening of the second upper housing communicating with the interior of the first upper housing.

[0010] The first lower housing is in the shape of an inverted frustum with openings at the top and bottom. The lower opening of the first upper housing and the upper opening of the first lower housing are connected to each other. The lower opening of the first lower housing is an air inlet. A second lower housing is disposed inside the first lower housing. The second lower housing is connected to the second upper housing. The second lower housing is in the shape of an inverted frustum with openings at the top and bottom. The upper opening of the second lower housing is connected to the lower opening of the second upper housing. The upper opening of the second upper housing is connected to the interior of the first upper housing.

[0011] All four housings—the first upper housing, the first lower housing, the second upper housing, and the second lower housing—are made of galvanized sheet metal, and each has a sound-absorbing unit on its inner side. The sound-absorbing unit includes fiberglass wool, galvanized perforated plates, and fiberglass cloth covering the fiberglass wool. The fiberglass wool and fiberglass cloth are located between the galvanized perforated plates and the inner sides of the corresponding housings. The outer side of the second upper housing and the corresponding galvanized perforated plates on the inner side of the first upper housing, as well as the outer side of the second lower housing and the corresponding galvanized perforated plates on the inner side of the first lower housing, maintain oblique gaps, and these oblique gaps form an obtuse angle. All the galvanized perforated plates of the second upper housing form an upper reflection space in the shape of a right frustum, and all the galvanized perforated plates of the second lower housing form a lower reflection space in the shape of an inverted frustum. The upper reflection space is connected to the lower reflection space in the shape of an inverted frustum.

[0012] As a preferred embodiment, the first upper shell and the first lower shell are mirror images of each other.

[0013] As a preferred embodiment, the second upper shell and the second lower shell are mirror-symmetrical.

[0014] As a preferred embodiment, the thickness of the galvanized sheet is greater than the thickness of the galvanized perforated plate.

[0015] As a preferred embodiment, the lower end face of the first upper housing is connected to the upper end face of the first lower housing.

[0016] As a preferred embodiment, the first upper housing and the second upper housing are coaxially arranged.

[0017] As a preferred embodiment, the first lower housing and the second lower housing are coaxially arranged.

[0018] As a preferred embodiment, the number of sides of the first upper housing is the same as the number of sides of the second upper housing.

[0019] This utility model has significant advantages and beneficial effects compared with the prior art, specifically:

[0020] It mainly increases the sound wave reflection path by combining oblique gaps, an upper reflection space in the shape of a regular truncated pyramid, a lower reflection space in the shape of an inverted truncated pyramid, and a sound-absorbing unit. Fiberglass wool and fiberglass cloth are then placed on the reflection path for sound absorption, which greatly enhances the sound absorption effect and thus greatly reduces noise.

[0021] Secondly, the first upper shell, the second upper shell, the first lower shell, and the second lower shell are all icosahedral in shape, which can maximize the sound wave reflection path and maximize the sound absorption effect.

[0022] To more clearly illustrate the structural features and effects of this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description

[0023] Figure 1 This is a front view of an embodiment of the present utility model (also showing the second upper housing and the second lower housing);

[0024] Figure 2 This is a top view of an embodiment of the present utility model;

[0025] Figure 3 This is a cross-sectional structural diagram of an embodiment of the present invention (mainly showing the first upper shell and the noise reduction unit).

[0026] Explanation of reference numerals in the attached diagram:

[0027] 10. First upper shell

[0028] 11. Air vent

[0029] 20. First lower shell

[0030] 21. Air Inlet

[0031] 30. Second upper shell

[0032] 31. First inclined notch groove

[0033] 40. Second lower housing; 41. Second inclined notch / groove

[0034] 50. Connecting plate

[0035] 60. Noise Reduction Unit

[0036] 61. Fiberglass wool 62. Fiberglass cloth

[0037] 63. Galvanized perforated plate

[0038] 71. Oblique gap; 72. Upper reflection space; 73. Lower reflection space. Detailed Implementation

[0039] Please refer to Figures 1 to 3As shown, it illustrates the specific structure of an embodiment of the present invention: an exhaust vent silencer, comprising a housing. The housing includes a first upper housing 10 and a first lower housing 20 that are connected and communicate with each other.

[0040] The lower end face of the first upper housing 10 is connected to the upper end face of the first lower housing 20. Preferably, the lower end face of the first upper housing 10 and the upper end face of the first lower housing 20 are connected by welding.

[0041] The first upper housing 10 is in the shape of a frustum with openings at the top and bottom, and the upper opening of the first upper housing 10 is an air outlet 11.

[0042] A second upper housing 30 is disposed inside the first upper housing 10. In this embodiment, the first upper housing 10 and the second upper housing 30 are coaxially arranged.

[0043] The second upper shell 30 is in the shape of a frustum with openings at both the top and bottom, and the upper opening of the second upper shell 30 communicates with the interior of the first upper shell 10. In this embodiment, the number of sides of the first upper shell 10 is the same as the number of sides of the second upper shell 30. Preferably, both the first upper shell 10 and the second upper shell 30 are in the shape of a frustum icosahedron.

[0044] The first lower housing 20 is shaped like an inverted frustum with openings at both the top and bottom. In this embodiment, the first upper housing 10 and the first lower housing 20 are mirror images of each other. The lower opening of the first upper housing 10 and the upper opening of the first lower housing 20 are interconnected, and the lower opening of the first lower housing 20 is an air inlet 21. A flange can be connected to the air inlet 21 of the first lower housing 20 to facilitate the connection of an exhaust port.

[0045] The first lower housing 20 is provided with a second lower housing 40. In this embodiment, the first lower housing 20 and the second lower housing 40 are coaxially arranged, and the second upper housing 30 and the second lower housing 40 are mirror-symmetrical.

[0046] The second lower housing 40 is connected to the second upper housing 30. Preferably, the lower end face of the second upper housing 30 and the upper end face of the second lower housing 40 are connected by welding. The connection between the first upper housing 10 and the second lower housing 40 is connected to the connection between the second upper housing 30 and the second lower housing 40 by a connecting plate 50.

[0047] In this embodiment, the lower end face of the second upper housing 30 is provided with a first inclined notch 31, and the upper end face of the second lower housing 40 is provided with a second inclined notch 41. An angle is formed between the inner top wall of the first inclined notch 31 and the inner bottom wall of the second inclined notch 41. Preferably, the included angle is an acute angle.

[0048] The second lower housing 40 is in the shape of an inverted frustum with openings at the top and bottom. The upper opening of the second lower housing 40 is connected to the lower opening of the second upper housing 30, and the upper opening of the second upper housing 30 is connected to the interior of the first upper housing 10. Preferably, both the first lower housing 20 and the second lower housing 40 are in the shape of an inverted frustum.

[0049] The first upper shell 10, the first lower shell 20, the second upper shell 30 and the second lower shell 40 are all made of galvanized sheet, and each of them has a sound-absorbing unit 60 on its inner side.

[0050] The noise reduction unit 60 includes fiberglass wool 61, a galvanized perforated plate 63, and fiberglass cloth 62 covering the periphery of the fiberglass wool 61. In this embodiment, the thickness of the galvanized plate is greater than the thickness of the galvanized perforated plate 63. Preferably, the thickness of the galvanized plate is 1.5 mm, and the thickness of the galvanized perforated plate 63 is 0.8 mm.

[0051] The fiberglass wool 61 and fiberglass cloth 62 are located between the galvanized perforated plate 63 and the inner side of the corresponding housing. The outer side of the second upper housing 30 and the corresponding galvanized perforated plate 63 on the inner side of the first upper housing 10, and the outer side of the second lower housing 40 and the corresponding galvanized perforated plate 63 on the inner side of the first lower housing 20, maintain an obtuse angle between the obtuse gaps 71. All the galvanized perforated plates 63 of the second upper housing 30 form an upper reflective space 72 in the shape of a truncated pyramid, and all the galvanized perforated plates 63 of the second lower housing 40 form a lower reflective space 73 in the shape of an inverted truncated pyramid. The upper reflective space 72 is connected to the lower reflective space 73 in the shape of an inverted truncated pyramid.

[0052] The working principle is explained in general as follows: After the noise comes out of the exhaust fan, it first enters the first lower housing 20 through the lower opening and then splits into two parts;

[0053] A portion of the noise energy enters the gap between the galvanized perforated plate 63 on the outer side of the second lower housing 40 and the inner side of the first lower housing 20. Some of the noise energy in the gap is continuously reflected between the galvanized perforated plate 63 on the outer side of the second lower housing 40 and the inner side of the first lower housing 20 until it enters the gap between the galvanized perforated plate 63 on the outer side of the second upper housing 30 and the inner side of the first upper housing 10. Some of the noise energy is absorbed by the fiberglass wool 61 and fiberglass cloth 62 through the corresponding galvanized perforated plate 63 on the inner side of the first lower housing 20 during the reflection process.

[0054] Similarly, some of the noise energy located in the gap is continuously reflected between the galvanized perforated plate 63 on the outer side of the second upper housing 30 and the inner side of the first upper housing 10 until it is discharged from the air outlet 11, while some of it is absorbed by the corresponding fiberglass wool 61 and fiberglass cloth 62 through the galvanized perforated plate 63 on the inner side of the first upper housing 10 during the reflection process.

[0055] Another part enters the lower reflection space 73 through the lower opening of the second lower housing 40. Some of the noise energy in the lower reflection space 73 is continuously reflected until it enters the upper reflection space 72. Some of it is absorbed by the fiberglass wool 61 and fiberglass cloth 62 through the corresponding galvanized perforated plate 63 on the inner side of the second lower housing 40 during the reflection process.

[0056] Similarly, some of the noise energy located in the upper reflection space 72 is continuously reflected within the upper reflection space 72 until it enters the first upper housing 10 through the upper opening of the second upper housing 30 and exits through the air outlet 11. Some of the noise energy is absorbed by the fiberglass wool 61 and fiberglass cloth 62 through the corresponding galvanized perforated plate 63 on the inner side of the second upper housing 30 during the reflection process.

[0057] The key design feature of this invention is that it increases the sound wave reflection path by combining an oblique gap, an upper reflection space in the shape of a regular truncated pyramid, a lower reflection space in the shape of an inverted truncated pyramid, and a sound-absorbing unit. Fiberglass wool and fiberglass cloth are then placed along the reflection path for sound absorption, greatly enhancing the sound absorption effect and thus significantly reducing noise.

[0058] Secondly, the first upper shell, the second upper shell, the first lower shell, and the second lower shell are all icosahedral in shape, which can maximize the sound wave reflection path and maximize the sound absorption effect.

[0059] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the technical scope of the present utility model. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A vent silencer, comprising a housing, characterized in that: The outer shell includes a first upper shell and a first lower shell that are connected and communicate with each other. The first upper shell is in the shape of a frustum with openings at the top and bottom. The upper opening of the first upper shell is an air outlet. A second upper shell is disposed inside the first upper shell. The second upper shell is in the shape of a frustum with openings at the top and bottom. The upper opening of the second upper shell communicates with the interior of the first upper shell. The first lower housing is an inverted frustum shape with openings at the top and bottom. The lower opening of the first upper housing and the upper opening of the first lower housing are connected to each other. The lower opening of the first lower housing is an air inlet. A second lower housing is installed inside the first lower housing. The second lower housing is connected to the second upper housing. The second lower housing is an inverted frustum shape with openings at the top and bottom. The upper opening of the second lower housing is connected to the lower opening of the second upper housing. The upper opening of the second upper housing is connected to the interior of the first upper housing. The first upper shell, the first lower shell, the second upper shell, and the second lower shell are all made of galvanized sheet metal, and each of them has a sound-absorbing unit on its inner side. The sound-absorbing unit includes fiberglass wool, galvanized perforated plates, and fiberglass cloth covering the fiberglass wool. The fiberglass wool and fiberglass cloth are located between the galvanized perforated plates and the inner sides of the corresponding shells. The outer side of the second upper shell and the corresponding galvanized perforated plates on the inner side of the first upper shell, and the outer side of the second lower shell and the corresponding galvanized perforated plates on the inner side of the first lower shell, maintain oblique gaps, and the oblique gaps between the two form an obtuse angle. All the galvanized perforated plates of the second upper shell form an upper reflection space in the shape of a regular frustum, and all the galvanized perforated plates of the second lower shell form a lower reflection space in the shape of an inverted frustum. The upper reflection space is connected to the lower reflection space in the shape of an inverted frustum.

2. The exhaust port silencer of claim 1, wherein: The first upper shell and the first lower shell are mirror images of each other.

3. The exhaust port silencer of claim 1, wherein: The second upper shell and the second lower shell are mirror images of each other.

4. The exhaust port silencer of claim 1, wherein: The thickness of the galvanized sheet is greater than the thickness of the galvanized perforated plate.

5. The exhaust port silencer of claim 1, wherein: The lower end face of the first upper housing is connected to the upper end face of the first lower housing.

6. The exhaust port silencer of claim 1, wherein: The first upper housing and the second upper housing are coaxially arranged.

7. The exhaust port silencer of claim 1, wherein: The first lower housing and the second lower housing are coaxially arranged.

8. The exhaust port silencer of claim 1, wherein: The number of sides of the first upper housing is the same as the number of sides of the second upper housing.

Images