Pipeline fan

Abstract

The utility model provides a pipeline fan, and relates to the technical field of fan noise reduction, in order to solve the problems that in the prior art, an air outlet of a pipeline fan generates large wind shear sound and noise is loud, the pipeline fan comprises a silencing outer barrel and a fan core, the silencing outer barrel is of a barrel-shaped structure with the two ends open, and the fan core is arranged in the silencing outer barrel. The fan core is arranged in the silencing outer barrel, a silencing block is connected to the air outlet side of the fan core, a first silencing layer is arranged in the silencing outer barrel and close to the air outlet side of the fan core, and the first silencing layer is attached to the inner wall of the silencing outer barrel by a circle and arranged on the outer side of the silencing block in a spaced mode; and an air outlet channel is formed between the silencing block and the first silencing layer. According to the pipeline fan, noise in the operation process is effectively reduced, the problem of air leakage at the connecting position is solved, the application range is wide, and the noise reduction effect is better.

Description

Technical Field

[0001] The utility model relates to the technical field of fan noise reduction, in particular to a pipeline fan. Background Art

[0002] Duct fans can drive high-speed flow of gas to perform corresponding work through high-speed operation. They are widely used in industry, buildings, indoor ventilation or duct pressurization.

[0003] When the existing duct fan is in operation, it will generate a lot of noise due to the influence of wind resistance, especially at the air outlet of the duct fan, it will generate a large wind shearing sound and the noise is relatively large. Existing duct fans are generally silenced by connecting a silencer at one end. For example, a patent application document with application number 202121837922.X discloses a silencer for a duct fan, including an outer cylinder, and silencer cotton is arranged in the outer cylinder. Both the outer cylinder and the silencer cotton are hollow structures with openings at both ends. Silencer cover and flange are also respectively installed at both ends of the outer cylinder, and center holes are provided on the silencer cover and the flange. The silencer is installed at the air outlet of the duct fan through the flange. When this silencer is connected, it is necessary to ensure the sealing of the connection with the duct fan, and its sealing has a great influence on the noise reduction effect. Utility Model Content

[0004] The purpose of the utility model is to provide a duct fan to solve the problem that the air outlet of the duct fan in the prior art produces large wind shearing sound and high noise. The duct fan of the utility model effectively reduces the noise during operation, avoids the problem of air leakage at the connection, has a wide range of applications, and has a better noise reduction effect.

[0005] The utility model provides a duct fan, comprising a silencer outer cylinder and a fan core, the silencer outer cylinder being a tubular structure with openings at both ends, the fan core being arranged in the silencer outer cylinder, a silencer block being connected to the air outlet side of the fan core, a first silencer layer being arranged in the silencer outer cylinder near the air outlet side of the fan core, the first silencer layer being arranged in contact with the inner wall of the silencer outer cylinder and having a gap arranged on the outside of the silencer block, and an air outlet channel being formed between the silencer block and the first silencer layer.

[0006] As a preferred solution of the utility model, a second sound-absorbing layer is arranged in the sound-absorbing outer cylinder near the air inlet side of the fan core, and the second sound-absorbing layer is arranged in contact with the inner wall of the sound-absorbing outer cylinder.

[0007] As a preferred solution of the utility model, the silencer outer cylinder is cylindrical, and the fan core and the first silencer layer are both coaxially arranged with the silencer outer cylinder.

[0008] As a preferred solution of the utility model, the silencer block is cylindrical and is coaxially connected to the fan core via a connecting rod.

[0009] As a preferred solution of the utility model, a bevel is provided on the side of the silencer block away from the fan core, and the bevel is inclined from its side toward the direction close to its axis and makes the width of the air outlet channel away from the fan core greater than the width of the side close to the fan core.

[0010] As a preferred solution of the present invention, the first sound-absorbing layer and the second sound-absorbing layer are both sound-absorbing cotton.

[0011] As a preferred solution of the utility model, a first end cover and a second end cover are respectively provided at the air inlet end and the air outlet end of the silencer outer cylinder, the first end cover is provided at an end of the second silencer layer away from the fan core, and the second end cover is provided at an end of the first silencer layer away from the fan core.

[0012] As a preferred solution of the present invention, a bracket is arranged on the outside of the silencer outer cylinder, and the bracket is connected to two sides of the silencer outer cylinder.

[0013] Compared with the prior art, the utility model has the following positive effects:

[0014] The duct fan provided by the utility model includes a silencer outer cylinder and a fan core. The silencer outer cylinder is a cylindrical structure with openings at both ends. The fan core is arranged in the silencer outer cylinder. A silencer block is connected to the air outlet side of the fan core. A first silencer layer is arranged in the silencer outer cylinder near the air outlet side of the fan core. The first silencer layer is arranged in contact with the inner wall of the silencer outer cylinder and is arranged with a gap on the outside of the silencer block. An air outlet channel is formed between the silencer block and the first silencer layer. When the duct fan of the utility model is in operation, the fan core drives the airflow from the air inlet of the silencer outer cylinder to the fan core and blows from the air outlet side of the fan core to the air outlet of the silencer outer cylinder. The airflow blown out from the air outlet side of the fan core is reduced by the silencer effect of the first silencer layer and the silencer block, thereby reducing the wind shearing sound at the air outlet and reducing the noise of the air outlet. The silencer block has the function of silencing the airflow on the one hand, and on the other hand, it has the function of guiding the airflow, so that the airflow flows from the air outlet channel to the air outlet of the silencer outer cylinder. The airflow coming out of the fan core is first divided and then reunited through the air outlet channel. In this process, the energy of the airflow can be reduced, and the low-frequency noise is turned into ultra-low-frequency noise, further reducing noise pollution. The fan core is installed inside the silencer outer cylinder. The first silencer layer and the silencer block inside the silencer outer cylinder directly silence the airflow of the fan core, reducing noise pollution. It is easy to install. Compared with the existing sealed connection with the silencer, it avoids the problem of air leakage at the connection. It has a wide range of applications and better noise reduction effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 This is an exploded view of the duct fan of the utility model;

[0017] Figure 2 This is the internal structure diagram of the duct fan of the utility model;

[0018] Figure 3 It is a left view of the duct fan of the utility model;

[0019] Figure 4 This is a front view of the duct fan of the utility model.

[0020] In the figure: 1. Silencing outer cylinder; 11. Air outlet channel; 2. First silencing layer; 3. Silencing block; 31. Bevel; 4. Fan core; 41. Connecting rod; 5. Second silencing layer; 6. First end cover; 7. Second end cover; 8. Bracket. DETAILED DESCRIPTION

[0021] In the description of the present utility model, it should be noted that, unless otherwise specified, "multiple" means two or more; the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", "front end", "back end", "head", "tail" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present utility model and simplification, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0022] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0023] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings.

[0024] Embodiment 1:

[0025] This embodiment provides a duct fan, such as Figure 1-Figure 4 As shown, it includes a silencer outer cylinder 1 and a fan core 4. The silencer outer cylinder 1 is a cylindrical structure with openings at both ends, one end of which is an air inlet and the other end is an air outlet.

[0026] The fan core 4 is arranged in the silencer outer cylinder 1. The fan core 4 can be connected to the inner wall of the silencer outer cylinder 1 or can be arranged with a gap between the inner wall of the silencer outer cylinder 1. The air inlet side and the air outlet side of the fan core 4 are respectively oriented toward the air inlet and the air outlet of the silencer outer cylinder 1. The fan core 4 is an existing fan structure, and the wind wheel is driven to rotate by the motor, so that the airflow flows from the air inlet side to the air outlet side.

[0027] A silencer block 3 is connected to the air outlet side of the fan core 4, and a first silencer layer 2 is arranged in the silencer outer cylinder 1 on the air outlet side close to the fan core 4. The first silencer layer 2 is arranged to be attached to the inner wall of the silencer outer cylinder 1 and is arranged with a gap on the outside of the silencer block 3, and an air outlet channel 11 is formed between the silencer block 3 and the first silencer layer 2.

[0028] When the duct fan of this embodiment is in operation, the fan core 4 drives the airflow from the air inlet of the silencer outer cylinder 1 to the fan core 4 and blows from the air outlet side of the fan core 4 to the air outlet of the silencer outer cylinder 1. The airflow blown out from the air outlet side of the fan core 4 is silenced by the first silencer layer 2 and the silencer block 3, reducing the wind shearing sound at the air outlet and reducing the noise of the air outlet. The silencer block 3 has a silencing effect on the airflow on the one hand, and a guiding effect on the other hand, so that the airflow flows from the air outlet channel 11 to the air outlet of the silencer outer cylinder 1. The airflow coming out of the fan core 4 is first split and then re-converged through the air outlet channel 11. In this process, the energy of the airflow can be reduced, and at the same time, the low-frequency noise is turned into ultra-low-frequency noise, further reducing noise pollution.

[0029] In addition, the fan core 4 in the present embodiment is installed inside the silencer outer cylinder 1, and the first silencer layer 2 and the silencer block 3 inside the silencer outer cylinder 1 directly silence and reduce the noise of the air outlet of the fan core 4, thereby reducing noise pollution and being easy to install. Compared with the existing sealed connection with the silencer, it avoids the problem of air leakage at the connection, has a wide range of applications and better noise reduction effect.

[0030] The duct fan of this embodiment can be connected to a duct and used for exhaust and air supply in hotels, indoor or greenhouse planting, etc., greatly reducing the noise interference to the place of use.

[0031] As a preferred embodiment, a second sound-absorbing layer 5 is provided on the air inlet side of the sound-absorbing outer cylinder 1 close to the fan core 4 , and the second sound-absorbing layer 5 is arranged to be attached to the inner wall of the sound-absorbing outer cylinder 1 around a circle.

[0032] The second sound-absorbing layer 5 in this embodiment is used to silence the airflow on the air inlet side of the fan core 4, reducing the noise of the airflow entering the fan core 4. The air inlet side and the air outlet side of the fan core 4 are both installed with sound-absorbing layers, and the sound-absorbing outer cylinder 1 and the first sound-absorbing layer 2 and the second sound-absorbing layer 5 form a sound-absorbing cabin for silencing the airflow. The airflow entering and exiting the fan core 4 is silenced by the sound-absorbing cabin, and the noise reduction effect is obvious.

[0033] As a preferred embodiment, the silencer outer cylinder 1 is cylindrical, and the fan core 4 and the first silencer layer 2 are coaxially arranged with the silencer outer cylinder 1, so that the airflow in and out of the fan core flows smoothly, further reducing noise.

[0034] The first sound-absorbing layer 2 and the second sound-absorbing layer 5 are both cylindrical hollow structures with openings at both ends.

[0035] As a preferred embodiment, the muffler block 3 is cylindrical and is coaxially connected to the fan core 4 through a connecting rod 41. The connecting rod 41 can be a screw, one end of which is connected to the tail end of the fan core 4 and the other end is arranged through the axis of the muffler block 3.

[0036] The first sound-absorbing layer 2, the second sound-absorbing layer 5 and the sound-absorbing block 3 are all porous sound-absorbing materials. The sound energy of the wind is converted into heat energy and dissipated by friction in the pores of the porous sound-absorbing material, so that the sound waves are weakened, thereby achieving noise reduction without affecting the performance of the duct fan.

[0037] As a preferred implementation mode, Figure 2 As shown, the side of the muffler block 3 facing away from the fan core 4 is provided with a bevel 31, and the bevel 31 is inclined from its side to the direction close to its axis and makes the width of the side of the air outlet channel 11 facing away from the fan core 4 greater than the width of the side close to the fan core 4. The longitudinal section of the air outlet channel 11 is ring-shaped. The tail end of the air outlet channel 11 is flared to make the air outlet smoother.

[0038] As a preferred embodiment, the first sound-absorbing layer 2 and the second sound-absorbing layer 5 are both sound-absorbing cotton. The thickness of the first sound-absorbing layer 2 is equal to the thickness of the second sound-absorbing layer 5. The first sound-absorbing layer 2 and the second sound-absorbing layer 5 are coaxially arranged, which has a good sound-absorbing and noise-reducing effect.

[0039] It should be noted that the first sound-absorbing layer 2 , the second sound-absorbing layer 5 and the sound-absorbing block 3 may also be other porous sound-absorbing materials.

[0040] As a preferred embodiment, a first end cap 6 and a second end cap 7 are respectively provided at the air inlet end and the air outlet end of the silencer outer cylinder 1, the first end cap 6 is provided at the end of the second silencer layer 5 away from the fan core 4, and the second end cap 7 is provided at the end of the first silencer layer 2 away from the fan core 4. The first end cap 6 and the second end cap 7 are used to connect with the pipeline to install the duct fan of this embodiment on the connecting pipeline. The silencer outer cylinder 1, the first end cap 6 and the second end cap 7 can be made of corrosion-resistant stainless steel and have a long service life.

[0041] As a preferred embodiment, a bracket 8 is provided on the outside of the silencer outer cylinder 1, and the bracket 8 is connected to both sides of the silencer outer cylinder 1. The bracket 8 is a U-shaped structure, and the axis of the silencer outer cylinder 1 passes through the U-shaped inner side of the bracket 8. The bracket 8 supports and fixes the duct fan of this embodiment, making it more firmly installed.

[0042] The above is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make several modifications and improvements without departing from the creative concept of the present invention, which should be included in the protection scope of the present invention.

Claims

1. A duct fan, characterized in that: The invention comprises a silencer outer cylinder (1) and a fan core (4), wherein the silencer outer cylinder (1) is a cylindrical structure with two ends open, the fan core (4) is arranged in the silencer outer cylinder (1), a silencer block (3) is connected to the air outlet side of the fan core (4), a first silencer layer (2) is arranged in the silencer outer cylinder (1) near the air outlet side of the fan core (4), the first silencer layer (2) is arranged in contact with the inner wall of the silencer outer cylinder (1) and is arranged with a gap on the outside of the silencer block (3), and an air outlet channel (11) is formed between the silencer block (3) and the first silencer layer (2).

2. A duct fan according to claim 1, characterized in that: A second sound-absorbing layer (5) is arranged in the sound-absorbing outer cylinder (1) near the air inlet side of the fan core (4), and the second sound-absorbing layer (5) is arranged in contact with the inner wall of the sound-absorbing outer cylinder (1) around a circle.

3. A duct fan according to claim 1, characterized in that: The silencer outer cylinder (1) is cylindrical, and the fan core (4) and the first silencer layer (2) are both coaxially arranged with the silencer outer cylinder (1).

4. A duct fan according to claim 1, characterized in that: The silencer block (3) is cylindrical and is coaxially connected to the fan core (4) via a connecting rod (41).

5. A duct fan according to claim 4, characterized in that: The muffler block (3) is provided with a bevel (31) on a side facing away from the fan core (4), and the bevel (31) is inclined from its side toward a direction close to its axis so that the width of the air outlet channel (11) on the side facing away from the fan core (4) is greater than the width on the side close to the fan core (4).

6. A duct fan according to claim 2, characterized in that: The first sound-absorbing layer (2) and the second sound-absorbing layer (5) are both sound-absorbing cotton.

7. A duct fan according to claim 2, characterized in that: A first end cover (6) and a second end cover (7) are respectively arranged at the air inlet end and the air outlet end of the silencer outer cylinder (1); the first end cover (6) is arranged at an end of the second silencer layer (5) facing away from the fan core (4); and the second end cover (7) is arranged at an end of the first silencer layer (2) facing away from the fan core (4).

8. The duct fan according to claim 1, characterized in that: A bracket (8) is provided on the outside of the silencer outer cylinder (1), and the bracket (8) is connected to both sides of the silencer outer cylinder (1).

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