Noise reduction device for combined flow closed cooling tower fan

Abstract

The utility model discloses a noise reduction device for a combined flow closed cooling tower fan. Comprising an air chamber, a flow guide pipe, a resistive silencing grid and a connecting piece. A connecting piece is arranged at the bottom of the air chamber in the circumferential direction, the air chamber is connected with an air outlet of the fan through the connecting piece, the air chamber is connected with a flow guide pipe, and a resistive silencing grid is arranged at an outlet of the flow guide pipe; the air chamber is of a circular-truncated-cone-shaped structure, the outer surface of the air chamber is of an arc-shaped structure, the diameter of an inlet of the air chamber is larger than that of an outlet of the air chamber, and a sound absorption layer is arranged on the inner wall of the air chamber. The air direction of an inlet of the flow guide pipe is parallel to the vertical face, an angle exists between the air direction of an outlet of the flow guide pipe and the vertical face, flow guide pieces are evenly arranged in the flow guide pipe, the flow guide pieces divide the interior of the flow guide pipe into mutually independent air channels, and the flow guide pieces are matched with the resistive silencing grid to orient the air outlet direction. According to the combined flow closed cooling tower fan, the air outlet noise of the combined flow closed cooling tower fan is greatly reduced.

Description

Technical Field:

[0001] The utility model belongs to the technical field of closed cooling towers, and particularly relates to a noise reduction device for a composite flow closed cooling tower fan. Background Art:

[0002] The closed cooling tower ensures the cooling effect through the heat exchange of the flowing air, spray water and circulating water, and is widely used in various industries. When it is necessary to cool a medium with high temperature and a large temperature difference before and after cooling, the cooling effect of the conventional closed cooling tower cannot meet the use requirements. Therefore, people adopt a composite flow closed cooling tower to cool this kind of medium. Since the air volume of the composite flow closed cooling tower is large enough, the cooling of this kind of medium can be satisfied.

[0003] The wind pressure of the composite flow closed cooling tower fan is higher than that of the ordinary closed cooling tower, and the noise generated by the fan is very large. The ordinary air hood has a poor noise reduction effect on the noise generated by the composite flow closed cooling tower fan.

[0004] The information disclosed in this background art section is only intended to enhance the overall understanding of the present utility model and should not be regarded as an admission or any form of suggestion that this information constitutes prior art already known to those of ordinary skill in the art. Summary of the Utility Model:

[0005] The purpose of the present utility model is to provide a noise reduction device for a composite flow closed cooling tower fan, so as to overcome the defects in the above-mentioned prior art.

[0006] To achieve the above purpose, the present utility model provides a noise reduction device for a composite flow closed cooling tower fan, which includes an air chamber, a diversion pipe, a resistive sound-absorbing grid, and a connecting piece; the connecting piece is circumferentially arranged at the bottom of the air chamber, the air chamber is connected to the air outlet of the fan through the connecting piece, the air chamber is connected to the diversion pipe, and the resistive sound-absorbing grid is arranged at the outlet of the diversion pipe; the air chamber is of a frustum shape, the outer surface of the air chamber is an arc structure, the diameter of the air inlet of the air chamber is larger than the diameter of the air outlet of the air chamber, and a sound-absorbing layer is arranged on the inner wall of the air chamber; the inlet wind direction of the diversion pipe is parallel to the vertical plane, the outlet wind direction of the diversion pipe has an angle with the vertical plane, diversion pieces are evenly arranged in the diversion pipe, the diversion pieces divide the inside of the diversion pipe into independent air channels, and the diversion pieces cooperate with the resistive sound-absorbing grid to direct the air outlet direction.

[0007] Preferably, in the technical solution, the sound-absorbing layer is made of waterproof ultra-fine glass wool, and the thickness of the sound-absorbing layer is 10 mm.

[0008] Preferably, in the technical solution, the diversion pipe is a 45° elbow pipe, the diversion pieces are diversion plates, the structure of the diversion plates is adapted to the internal structure of the diversion pipe, and the diversion plates divide the inside of the diversion pipe into independent air channels.

[0009] Preferably, in the technical solution, the resistive silencing grid is honeycomb-shaped, and the flow guide is matched with the honeycomb-shaped resistive silencing grid to direct the air outlet direction into a straight line.

[0010] Preferably, in the technical solution, the connecting piece adopts a locking flange pressing ring.

[0011] Compared with the prior art, the utility model has the following beneficial effects:

[0012] The sound absorption layer can absorb a large amount of vibration noise generated by the friction between the air flow and the inner wall of the air chamber, and can reduce the vibration noise by up to 75%. The air flow is divided by the flow guide plate to reduce the vibration noise generated by the turbulence inside the large air mass. The air outlet is accelerated through the air chamber, and through the cooperation of the flow guide plate and the honeycomb-shaped resistive silencing grid, the air outlet is discharged in a straight line for a relatively long distance, avoiding the accumulation of the discharged air flow at the outlet due to the pressure loss when contacting the external atmosphere to form an air wall and colliding with the subsequent air flow to generate noise. Description of the drawings:

[0013] Figure 1 It is a schematic structural diagram of the noise reduction device for the fan of the composite flow closed cooling tower of the utility model;

[0014] Figure 2 It is a schematic diagram of the working state of the noise reduction device for the fan of the composite flow closed cooling tower of the utility model. Specific embodiments:

[0015] The following is a detailed description of the specific embodiments of the utility model, but it should be understood that the protection scope of the utility model is not limited by the specific embodiments.

[0016] Unless otherwise clearly stated, throughout the specification and claims, the term "comprising" or its variations such as "comprises" or "including" etc. will be understood to include the stated elements or components, without excluding other elements or other components.

[0017] Such as Figure 1As shown in the figure, a noise reduction device for a composite flow closed cooling tower fan includes an air chamber 1, a diversion pipe 2, a honeycomb resistive sound absorption grid 3, and a locking flange pressing ring 4. The bottom circumference of the air chamber 1 is provided with a locking flange pressing ring 4. The air chamber 1 is connected to the air outlet of the fan 5 through the locking flange pressing ring 4. The air chamber 1 is connected to the diversion pipe 2. A honeycomb resistive sound absorption grid 3 is arranged at the outlet of the diversion pipe 2. The air chamber 1 is of a frustum shape. The outer surface of the air chamber 1 is an arc structure. The diameter of the inlet of the air chamber 1 is larger than the diameter of the outlet of the air chamber 1. An acoustic absorption layer 6 is arranged on the inner wall of the air chamber 1. The acoustic absorption layer 6 is made of waterproof superfine glass wool, and the thickness of the acoustic absorption layer 6 is 10 mm. The diversion pipe 2 is a 45° elbow. The inlet wind direction of the diversion pipe 2 is parallel to the vertical plane. The outlet wind direction of the diversion pipe 2 has an angle with the vertical plane. Guide plates 7 are evenly arranged in the diversion pipe 2. The structure of the guide plates 7 is adapted to the internal structure of the diversion pipe 2. The thickness of the guide plates 7 is 2 mm. The guide plates 7 divide the inside of the diversion pipe 2 into independent air channels. The guide plates 7 cooperate with the honeycomb resistive sound absorption grid 3 to direct the air outlet direction into a straight line.

[0018] As Figure 2 shown in the figure, during operation, the incoming air is discharged into the air chamber 1 by the fan 5. The acoustic absorption layer 6 can absorb a large amount of vibration noise generated by the friction between the air flow and the inner wall of the air chamber 1, and can reduce the vibration noise by up to 75%. The incoming air is accelerated in the air chamber 1 and then discharged into the diversion pipe 2. The guide plates 7 divide the large mass of air flow into multiple air flows entering independent air channels, reducing the vibration noise generated by the turbulence inside the large mass of air flow. The air flow is discharged in a straight line through the honeycomb resistive sound absorption grid 3 from the air channels for a relatively long distance, avoiding the accumulation of the discharged air flow at the outlet due to the pressure loss when contacting the outside atmosphere to form a wind wall and colliding with the subsequent air flow to generate noise.

[0019] The foregoing description of specific exemplary embodiments of the present invention is for the purposes of illustration and exemplification. These descriptions are not intended to limit the present invention to the precise forms disclosed, and it is obvious that many changes and variations are possible in light of the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical applications, so that those skilled in the art can implement and utilize various different exemplary embodiments of the present invention, as well as various different selections and changes. The scope of the present invention is intended to be defined by the claims and their equivalents.

Claims

1. A noise reduction device for a fan of a composite flow closed cooling tower, characterized in that: It includes an air chamber, a guide pipe, a resistive silencing grid, and a connecting piece; a connecting piece is circumferentially arranged at the bottom of the air chamber, the air chamber is connected to the air outlet of the fan through the connecting piece, the air chamber is connected to the guide pipe, and a resistive silencing grid is arranged at the outlet of the guide pipe; the air chamber is of a frustum structure, the outer surface of the air chamber is an arc structure, the diameter at the inlet of the air chamber is larger than the diameter at the outlet of the air chamber, and a sound-absorbing layer is arranged on the inner wall of the air chamber; the wind direction at the inlet of the guide pipe is parallel to the vertical plane, the wind direction at the outlet of the guide pipe has an angle with the vertical plane, guide pieces are evenly arranged in the guide pipe, the guide pieces divide the inside of the guide pipe into independent air ducts, and the guide pieces cooperate with the resistive silencing grid to direct the air outlet direction.

2. The noise reduction device for the fan of the composite flow closed cooling tower according to claim 1, wherein: The sound-absorbing layer is made of waterproof superfine glass wool, and the thickness of the sound-absorbing layer is 10 mm.

3. The noise reduction device for the fan of the composite flow closed cooling tower according to claim 1, characterized in that: The guide pipe is a 45° elbow pipe, the guide piece is a guide plate, the structure of the guide plate is adapted to the internal structure of the guide pipe, and the guide plate divides the inside of the guide pipe into independent air ducts.

4. The noise reduction device for the fan of the composite flow closed cooling tower according to claim 1, characterized in that: The resistive silencing grid is of a honeycomb type, and the guide piece cooperates with the honeycomb-type resistive silencing grid to direct the air outlet direction into a straight line.

5. The noise reduction device for the fan of the composite flow closed cooling tower according to claim 1, characterized in that: The connecting piece adopts a locking flange pressing ring.

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