Silencing device of dust removal fan

Abstract

The utility model relates to the technical field of silencers, and particularly discloses a silencing device of a dust removal fan. Comprising a shell, flange rings, an air inlet pipe, an inner cylinder, an internal sound absorption layer, damping strips and an external sound absorption layer, the flange rings are arranged at openings in the upper end and the lower end of the shell, the air inlet pipe communicated with an inner cavity of the shell is obliquely and downwards arranged on the side wall of the shell, the inner cylinder is concentrically arranged in the shell in a sleeved mode, and the internal sound absorption layer is fixedly arranged on the inner wall of the shell. A plurality of damping strips are vertically fixed on the outer wall of the inner cylinder, and the outer walls of the shell and the air inlet pipe are coated with an external sound absorption layer; the inner cylinder is embedded in the shell, the noise conduction path is prolonged, the inner sound absorption layer is arranged on the inner wall of the shell, the outer sound absorption layer is arranged on the outer wall of the shell, and the damping strips are arranged on the outer wall of the inner cylinder, so that noise reflection can be effectively reduced, and noise is consumed and absorbed through the inner sound absorption layer and the outer sound absorption layer; furthermore, flange rings are arranged at the upper end and the lower end of the shell, and the shell can be directly installed with an existing exhaust chimney pipeline in a butt joint mode.

Description

Technical field:

[0001] The utility model relates to the technical field of mufflers, in particular to a dust removal fan muffler device. Background technology:

[0002] A dust collector is a device that uses airflow to collect and transport productive dust. Gas and solids are separated in the dust collector through filter bags, filter screens or other mechanical structures. The airflow used is usually generated by a dust removal fan. The air inlet of the dust removal fan is connected to the dust collector, and the air outlet is connected to the exhaust duct. When the fan is running, in addition to the working noise of the fan motor itself, the noise mainly comes from the noise generated by the high-speed flow of air at the inlet and outlet and the vibration noise generated when the fan impeller is working. The noise of the dust removal fan will affect the hearing health of on-site workers, and may cause occupational diseases such as noise-induced deafness for a long time.

[0003] The existing solution is to connect the fan outlet to the exhaust chimney duct and cover the duct with an asbestos sound insulation layer. However, due to the high air flow velocity at the fan outlet, the friction and collision with the duct causes the entire duct to vibrate, making the noise difficult to control. The effect of a single asbestos sound insulation layer is not ideal. Utility model content:

[0004] The utility model aims to provide a dust removal fan silencer to solve the problems existing in the prior art.

[0005] The utility model is implemented by the following technical scheme: a dust removal fan silencer, comprising an outer shell, a flange ring, an air inlet pipe, an inner cylinder, an internal sound absorbing layer, a damping strip and an external sound absorbing layer, flange rings are provided at the openings at the upper and lower ends of the outer shell, an air inlet pipe connected to the inner cavity of the outer shell is provided obliquely downward on the side wall of the outer shell, an inner cylinder is concentrically sleeved in the outer shell, the upper end of the inner cylinder is sealed with the upper end of the outer shell, the lower end of the inner cylinder extends to below the edge where the outer shell and the air inlet pipe are connected, an internal sound absorbing layer is fixedly provided on the inner wall of the outer shell, a plurality of damping strips are vertically fixed on the outer wall of the inner cylinder, and an external sound absorbing layer is coated on the outer walls of the outer shell and the air inlet pipe.

[0006] Furthermore, a connecting plate having the same diameter as the flange ring is integrally formed at the upper end of the inner cylinder, the bottom surface of the connecting plate is sealedly connected to the top surface of the flange ring, and the lower end of the inner cylinder is in an arc-shaped constricted shape.

[0007] Furthermore, the inner sound absorbing layer is made of polyurethane foam material, and a plurality of conical holes are opened on the inner sound absorbing layer. The diameter of the conical holes on the inner wall side of the inner sound absorbing layer is smaller than the diameter of the holes on the outer wall side.

[0008] Furthermore, the cross section of the damping strip is triangular.

[0009] Furthermore, the external sound-absorbing layer is made of asbestos.

[0010] The advantages of the utility model are as follows: the structure of nesting an inner tube in an outer shell prolongs the path of noise conduction, and an internal sound-absorbing layer is provided on the inner wall of the outer shell, an external sound-absorbing layer is provided on the outer wall of the outer shell, and a damping strip is provided on the outer wall of the inner tube, which can effectively reduce the reflection of noise, and the internal sound-absorbing layer and the external sound-absorbing layer consume and absorb noise, thereby achieving the effect of reducing noise; further, flange rings are provided at the upper and lower ends of the outer shell, which can be directly docked and installed with the existing exhaust chimney pipe. Description of the drawings:

[0011] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0012] Figure 2 It is a schematic diagram of the structure of the inner cylinder.

[0013] Figure 3 Schematic diagram of the structure of the internal sound-absorbing layer.

[0014] In the figure: outer shell 1, flange ring 2, air inlet pipe 3, inner tube 4, internal sound absorbing layer 5, damping strip 6, external sound absorbing layer 7, connecting plate 401, and tapered hole 501. Specific implementation method:

[0015] The following will be combined with the drawings of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0016] In the description of the present invention, it should be noted that the terms "center", "up", "down", "front", "back", "top", "bottom", "left", "right", "vertical", "horizontal", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0017] like Figure 1As shown: a dust removal fan silencer device, which includes an outer shell 1, a flange ring 2, an air inlet pipe 3, an inner tube 4, an internal sound absorbing layer 5, a damping strip 6 and an external sound absorbing layer 7. Flange rings 2 are provided at the upper and lower openings of the outer shell 1. During installation, in order to adapt to the exhaust method of the existing dust collector exhaust port, the outer shell 1 needs to be placed between the upper and lower exhaust chimney pipes. The flange ring 2 is used to connect with the upper and lower exhaust chimney pipes. An air inlet pipe 3 connected to the inner cavity of the outer shell 1 is provided obliquely downward on the side wall of the outer shell 1. The other end of the air inlet pipe 3 is sealed with the dust collector fan. The airflow discharged by the dust removal fan first enters the air inlet pipe 3 and flows obliquely upward into the inner cavity of the outer shell 1.

[0018] like Figure 2 As shown in the figure: an inner cylinder 4 is concentrically sleeved in the outer shell 1, and a connecting plate 401 with the same diameter as the flange ring 2 is integrally formed on the upper end of the inner cylinder 4. The bottom surface of the connecting plate 401 is sealed and connected to the top surface of the flange ring 2. The lower end of the inner cylinder 4 extends to below the edge where the outer shell 1 is connected to the air inlet pipe 3. The airflow discharged by the dust removal fan is sent to the cavity of the outer shell 1 through the air inlet pipe 3, first diffuses into the space between the inner cylinder 4 and the outer shell 1, then moves downward into the inner cavity of the inner cylinder 4, and finally is discharged upward along the inner cavity of the inner cylinder 4. The structure of the inner cylinder 4 increases the path length of the airflow discharge, and also increases the conduction path of the noise, so that the energy of the noise is consumed in the conduction process, thereby achieving the effect of reducing noise; the lower end of the inner cylinder 4 is in an arc-shaped constriction shape. Due to the fast airflow velocity, the airflow at the lower end edge of the inner cylinder 4 changes from downward to upward movement, which is easy to generate turbulence at the lower end edge of the inner cylinder 4, causing high-frequency whistling. The arc-shaped constriction shape of the lower end of the inner cylinder 4 is conducive to reducing the whistling sound generated when the airflow passes through the lower end edge of the inner cylinder 4.

[0019] like Figure 3 As shown: an internal sound-absorbing layer 5 is fixedly provided on the inner wall of the outer shell 1. The internal sound-absorbing layer 5 is made of polyurethane foam material and is attached to the inner wall of the outer shell 1 by gluing. The function of the internal sound-absorbing layer 5 is to reduce the reflection of noise on the inner wall of the outer shell 1. At the same time, the polyurethane foam material can reduce the vibration of the outer shell 1, further reduce the energy of absorbing noise, and play a role in reducing noise; a conical hole 501 is opened on the internal sound-absorbing layer 5, and the aperture of the conical hole 501 on one side of the inner wall of the internal sound-absorbing layer 5 is smaller than the aperture on the outer wall side. The function of the conical hole 501 is to absorb noise sound waves. The opening of the inner wall of the conical hole 501 is used for noise sound waves to enter. The internal space of the conical hole 501 gradually expands, consuming the energy of the noise sound waves, and serving as an absorption trap for noise of a specific frequency, the noise can be further reduced.

[0020] A plurality of damping strips 6 are vertically fixed to the outer wall of the inner tube 4. The cross section of the damping strips 6 is triangular and arranged vertically. The damping strips 6 reduce the vibration of the inner tube 4 and reduce the noise reflection of the outer wall of the inner tube 4. The damping strips 6 can be made of a material such as rubber with a relatively soft texture, which can consume noise energy and reduce noise.

[0021] The outer walls of the outer shell 1 and the air inlet pipe 3 are coated with an external sound-absorbing layer 7, which is made of asbestos. There are many gaps between the fibers of the asbestos material, which can block the conduction of sound waves. Coating the outer walls of the outer shell 1 and the air inlet pipe 3 can effectively isolate the noise generated by the airflow in the outer shell 1 and the air inlet pipe 3, and can reduce the vibration of the outer shell 1 and the air inlet pipe 3 themselves.

Claims

1. A dust removal fan silencer, characterized in that: The invention comprises an outer shell (1), a flange ring (2), an air inlet pipe (3), an inner tube (4), an internal sound absorbing layer (5), a damping strip (6) and an external sound absorbing layer (7); the flange ring (2) is fixedly provided at the upper and lower openings of the outer shell (1); an air inlet pipe (3) communicating with the inner cavity of the outer shell (1) is obliquely provided downward on the side wall of the outer shell (1); an inner tube (4) is concentrically sleeved in the outer shell (1); the upper end of the inner tube (4) is sealedly connected to the upper end of the outer shell (1); the lower end of the inner tube (4) extends to below the edge where the outer shell (1) and the air inlet pipe (3) meet; the internal sound absorbing layer (5) is fixedly provided on the inner wall of the outer shell (1); a plurality of damping strips (6) are vertically fixed on the outer wall of the inner tube (4); and the outer walls of the outer shell (1) and the air inlet pipe (3) are covered with an external sound absorbing layer (7).

2. A dust removal fan silencer according to claim 1, characterized in that: The upper end of the inner cylinder (4) is integrally formed with a connecting disk (401) having the same diameter as the flange ring (2); the bottom surface of the connecting disk (401) is sealedly connected to the top surface of the flange ring (2); and the lower end of the inner cylinder (4) is in an arc-shaped constricted shape.

3. A dust removal fan silencer according to claim 2, characterized in that: The internal sound absorbing layer (5) is made of polyurethane foam material, and a plurality of conical holes (501) are provided on the internal sound absorbing layer (5). The diameter of the conical holes (501) located on the inner wall side of the internal sound absorbing layer (5) is smaller than the diameter of the holes on the outer wall side.

4. A dust removal fan silencer device according to claim 3, characterized in that: The cross section of the damping strip (6) is a triangle.

5. A dust removal fan silencer according to any one of claims 1 to 4, characterized in that: The external sound absorbing layer (7) is made of asbestos.

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