CN215672897U

CN215672897U - Noise reduction device for cooling tower axial flow fan

Info

Publication number: CN215672897U
Application number: CN202121288178.2U
Authority: CN
Inventors: 张力伟
Original assignee: Yingkou Lehua Thread Industry Co ltd
Current assignee: Yingkou Lehua Thread Industry Co ltd
Priority date: 2021-06-09
Filing date: 2021-06-09
Publication date: 2022-01-28
Anticipated expiration: 2031-06-09

Abstract

The utility model discloses a noise reduction device for a cooling tower axial flow fan, which comprises a cooling tower air port, an axial flow fan, a spring mounting plate, a spring, a fixing bolt, a fastening nut, a noise reduction shell, a sealing sleeve, an upper air outlet, an upper guide plate, a lower guide plate, an upper noise reduction plate, a lower noise reduction plate and a lower plate, wherein the upper air outlet is arranged at the upper part of the cooling tower air port; compared with the prior art, the utility model has the beneficial effects that: slow down axial fan air flow through hypoplastron and seal cover, discharge through from last air outlet in the passageway that inside baffle and the board of making an uproar formed of falling, the noise is discharged by the absorption noise reduction through inner wall multiple reflection, make the produced noise of the fan of air intake and air outlet department reduce greatly, fine noise reduction effect has been played, make the acoustic energy attenuate by a wide margin, be convenient for fall the noise, make the produced noise of fan can not cause the pollution to external environment, convenient to use.

Description

Noise reduction device for cooling tower axial flow fan

Technical Field

The utility model relates to the technical field of axial flow fans, in particular to a noise reduction device for a cooling tower axial flow fan.

Background

The cooling tower (The cooling tower) is a device which uses water as a circulating coolant, absorbs heat from a system and discharges The heat to The atmosphere so as to reduce The water temperature; the cold is an evaporation and heat dissipation device which utilizes the principle that water is in flowing contact with air and then carries out heat exchange to generate steam, the steam volatilizes and takes away heat to achieve evaporation and heat dissipation, convection heat transfer, radiation heat transfer and the like to dissipate waste heat generated in industry or refrigeration air conditioners to reduce the water temperature so as to ensure the normal operation of the system, and the device is generally barrel-shaped and is named as a cooling tower.

The cooling tower is a comprehensive product integrating various subjects such as aerodynamics, thermodynamics, fluidics, chemistry, biochemistry, materials science, static and dynamic structure mechanics, processing technology and the like. The water quality is a function of multiple variables, and the cooling is a process integrating multiple factors, multiple variables and multiple effects.

The method is divided into the following steps according to the ventilation mode: firstly, a natural ventilation cooling tower; a mechanical draft cooling tower; and thirdly, a mixed ventilation cooling tower.

The contact mode of water and air is divided into: wet cooling tower; dry cooling tower; dry and wet cooling tower;

according to the flowing direction of hot water and air: firstly, a counter-flow cooling tower; a cross flow direct-alternating flow cooling tower; and thirdly, a mixed flow cooling tower.

According to the application field: industrial cooling towers; ② an air-conditioning cooling tower.

In terms of noise level: a common cooling tower; a low noise cooling tower; thirdly, ultra-low noise cooling tower; and fourthly, the ultra-silent cooling tower.

Dividing into the following parts according to the shape: circular cooling tower: ② a square cooling tower.

According to whether water and air are directly contacted: opening type cooling tower: the closed cooling tower is also called as a closed cooling tower and a closed cooling tower.

Other types of cooling towers, such as jet cooling towers, cooling towers without fans, and the like.

The direct current fan is a fan which enables a direct current motor to rotate to drive a fan impeller to rotate by inputting direct current electric energy, so that the process of converting the direct current electric energy into mechanical energy is realized. The direct current fan is characterized in that a direct current motor is selected and matched.

At present, a direct current brushless motor is mostly adopted by a direct current fan, and the brushless direct current motor is greatly simplified in structure due to the fact that a collecting ring and an electric brush for excitation are omitted. Meanwhile, the manufacturability of the motor is improved, the mechanical reliability of the motor in operation is greatly enhanced, and the service life is prolonged. Meanwhile, the air gap magnetic density can be greatly improved, the motor index can realize the optimal design, and the direct effect is that the motor volume is reduced and the weight is lightened. Moreover, compared with other motors, the motor has excellent control performance. This is because: firstly, the torque constant, the torque inertia ratio, the power density and the like of the motor are greatly improved due to the high performance of the permanent magnet material. Through reasonable design, the indexes such as rotational inertia, electrical and mechanical time constants and the like can be greatly reduced, and the servo control performance is greatly improved as a main index. Secondly, the design of the modern permanent magnetic circuit is more perfect, and the coercive force of the permanent magnetic material is high, so that the anti-armature reaction and anti-demagnetization capability of the permanent magnetic motor are greatly enhanced, and the control parameters of the motor are greatly reduced along with the influence of external disturbance. Thirdly, because the permanent magnet replaces the electric excitation, the design of an excitation winding and an excitation magnetic field is reduced, so that a plurality of parameters such as excitation magnetic flux, excitation winding inductance, excitation current and the like are reduced, and the controllable variables or parameters are directly reduced. The permanent magnet motor has excellent controllability by combining the factors.

In the operation process of the cooling tower, the rotating speed of an axial flow fan is high, so that high fan noise, water spraying noise and air vibration noise are generated, high noise pollution is generated to the surrounding environment, and normal life and work of people are influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a noise reduction device for a cooling tower axial flow fan, which aims to solve the problems in the background technology.

In order to achieve the purpose, the device comprises a cooling tower air port, an axial flow fan, a spring mounting plate, a spring, a fixing bolt, a fastening nut, a noise reduction shell, a sealing sleeve, an upper air outlet, an upper guide plate, a lower guide plate, an upper noise reduction plate, a lower noise reduction plate and a lower plate; an installation flange is welded at the air port of the cooling tower, and a positioning hole is formed in the flange; the axial flow fan is arranged inside the air port of the cooling tower; a spring is arranged between the spring mounting plates, a fixing bolt is welded on the outer side of the spring mounting plates, and the fixing bolt at one end penetrates through a positioning hole in the cooling tower air port flange; a positioning hole is formed in the bottom surface of the noise reduction shell, and a bolt fixed at the other end of the spring mounting plate penetrates through the positioning hole in the noise reduction shell; the upper surface of the inner side of the sealing sleeve is arranged on the upper side of the bottom surface of the noise reduction shell, penetrates through a fixing bolt and is locked by a fastening nut, and the lower surface of the inner side of the sealing sleeve is arranged on the lower surface of a cooling tower air port flange, penetrates through the fixing bolt and is locked by the fastening nut; the upper air outlet is arranged at an outlet on the noise reduction shell and is positioned inside the noise reduction shell; the upper guide plate is arranged on the lower side of the upper air outlet; the upper noise reduction plate is arranged inside the upper guide plate; the lower guide plate is arranged on the upper surface of the lower plate; the lower noise reduction plate is arranged on the upper surface of the lower plate and is positioned on the inner side of the lower guide plate; the lower plate is mounted at the lower outlet of the noise reduction housing.

As a preferred technical scheme of the utility model, six positioning holes are circumferentially formed on the air port of the cooling tower, six positioning holes are circumferentially formed on the bottom surface of the noise reduction shell, six positioning holes are respectively formed on the upper side surface and the lower side surface of the sealing sleeve, and the six positioning holes, the sealing sleeve and the sealing sleeve are correspondingly arranged according to the positioning holes; the sealing sleeve is a PE corrugated pipe.

As a preferred technical scheme of the utility model, the spring mounting plate, the fixing bolt and the fastening nut are twelve; the spring is six.

As a preferred technical scheme of the utility model, the noise reduction shell is conical; the upper air outlet is in an inverted cone shape; the outer wall of the air outlet on the inner wall of the noise reduction shell is provided with an uneven noise reduction design.

As a preferred technical scheme of the utility model, the upper guide plate, the lower guide plate, the upper noise reduction plate and the lower noise reduction plate are all porous plates; the sections of the upper guide plate and the lower guide plate are circular, and the sections of the upper noise reduction plate and the lower noise reduction plate are regular hexagons; when the noise reduction device is installed, the upper noise reduction plate is positioned on the inner side of the lower noise reduction plate, and the upper guide plate is positioned between the lower guide plate and the lower noise reduction plate; the lower plate is provided with a through hole which is positioned at the outer side of the lower guide plate. The air flow speed in the axial flow fan is slowed down through the lower plate and the sealing sleeve, the air is discharged from the upper air outlet in a channel formed by the inner guide plate and the noise reduction plate, and the noise is absorbed and reduced through multiple reflections of the inner wall and discharged, so that the noise generated by the fan at the air inlet and the air outlet is greatly reduced.

Compared with the prior art, the utility model has the beneficial effects that: slow down axial fan air flow through hypoplastron and seal cover, discharge through from last air outlet in the passageway that inside baffle and the board of making an uproar formed of falling, the noise is discharged by the absorption noise reduction through inner wall multiple reflection, make the produced noise of the fan of air intake and air outlet department reduce greatly, fine noise reduction effect has been played, make the acoustic energy attenuate by a wide margin, be convenient for fall the noise, make the produced noise of fan can not cause the pollution to external environment, convenient to use.

Drawings

FIG. 1 is a perspective view of the present invention;

FIG. 2 is a top view of the present invention;

FIG. 3 is a cross-sectional view of the present invention;

FIG. 4 is a schematic view of a practical upper noise reduction plate;

FIG. 5 is a schematic view of a lower noise reduction plate according to the present invention;

in the figure: 1-cooling tower air port, 2-axial flow fan, 3-spring mounting plate, 4-spring, 5-fixing bolt, 6-fastening nut, 7-noise reduction shell, 8-sealing sleeve, 9-upper air outlet, 10-upper guide plate, 11-lower guide plate, 12-upper noise reduction plate, 13-lower noise reduction plate and 14-lower plate.

Detailed Description

Example 1

As shown in fig. 1 to 5, the cooling tower comprises a cooling tower tuyere 1 and an axial flow fan 2, and is characterized in that: the noise reduction device comprises a spring mounting plate 3, a spring 4, a fixing bolt 5, a fastening nut 6, a noise reduction shell 7, a sealing sleeve 8, an upper air outlet 9, an upper guide plate 10, a lower guide plate 11, an upper noise reduction plate 12, a lower noise reduction plate 13 and a lower plate 14; an installation flange is welded on the cooling tower air port 1, and a positioning hole is formed in the flange; the axial flow fan 2 is arranged inside the cooling tower air port 1; a spring 4 is arranged between the spring mounting plates 3, a fixing bolt 5 is welded on the outer side of the spring mounting plates, and the fixing bolt 5 at one end penetrates through a positioning hole in a flange of the cooling tower air port 1; a positioning hole is formed in the bottom surface of the noise reduction shell 7, and a bolt 5 fixed to the other end of the spring mounting plate 3 penetrates through the positioning hole in the noise reduction shell 7; the upper surface of the inner side of the sealing sleeve 8 is arranged on the upper side of the bottom surface of the noise reduction shell 7, penetrates through the fixing bolt 5 and is locked by the fastening nut 6, and the lower surface of the inner side of the sealing sleeve is arranged on the lower surface of the flange of the cooling tower air port 1, penetrates through the fixing bolt 5 and is locked by the fastening nut 6; the upper air outlet 9 is arranged at an outlet of the noise reduction shell 7 and is positioned inside the noise reduction shell 7; the upper guide plate 10 is arranged at the lower side of the upper air outlet 9; the upper noise reduction plate 12 is arranged inside the upper guide plate 10; the lower guide plate 11 is mounted on the upper surface of the lower plate 14; the lower noise reduction plate 13 is arranged on the upper surface of the lower plate 14 and is positioned on the inner side of the lower guide plate 11; the lower plate 14 is mounted at the lower outlet of the noise reduction housing 7. Six positioning holes are formed in the circumference of the cooling tower air port 1, six positioning holes are formed in the circumference of the bottom surface of the noise reduction shell 7, six positioning holes are formed in the upper side surface and the lower side surface of the sealing sleeve 8, and the six positioning holes, the six positioning holes and the sealing sleeve are correspondingly installed according to the positioning holes; the sealing sleeve 8 is a PE corrugated pipe. The spring mounting plate 3, the fixing bolt 5 and the fastening nut 6 are twelve; the spring 4 is six pieces. The noise reduction shell 7 is conical; the upper air outlet 9 is in an inverted cone shape; the outer wall of the air outlet 9 on the inner wall of the noise reduction shell 7 is provided with an uneven noise reduction design. The upper guide plate 10, the lower guide plate 11, the upper noise reduction plate 12 and the lower noise reduction plate 13 are all porous plates; the sections of the upper guide plate 10 and the lower guide plate 11 are circular, and the sections of the upper noise reduction plate 12 and the lower noise reduction plate 13 are regular hexagons; when the noise reduction plate is installed, the upper noise reduction plate 12 is positioned on the inner side of the lower noise reduction plate 13, and the upper guide plate 10 is positioned between the lower guide plate 11 and the lower noise reduction plate 13; the lower plate 14 is provided with a through hole and is positioned outside the lower guide plate 11.

The working principle of the utility model is as follows: the utility model is arranged on the air port 1 of the cooling tower, the cooling tower is started, the internal axial flow fan 2 starts to rotate to generate upward air flow, the upward air flow passes through the through hole on the lower plate 14, passes through the channel formed by the upper guide plate 10, the lower guide plate 11, the upper noise reduction plate 12 and the noise reduction plate 13, and is discharged from the upper air outlet 9. The noise is reflected for a plurality of times by the concave-convex parts on the internal noise reduction shell 7 and the upper air outlet 9, and is absorbed by the upper guide plate 10, the lower guide plate 11, the upper noise reduction plate 12 and the lower noise reduction plate 13, so that the noise penetrating out of the upper air outlet 9 is reduced. Meanwhile, the internal air pressure is increased, the lower plate 14 is jacked up, the spring 4 and the sealing sleeve 8 are driven to stretch, the dynamic balance of the internal air pressure is kept, the air flow rate is reduced, and the noise generated by air vibration is reduced.

Components not described in detail herein are prior art.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore are not to be construed as limiting the utility model, and further, the terms "first", "second", etc., are used only for descriptive purposes and are not intended to indicate or imply relative importance or to implicitly indicate the number of technical features indicated, whereby the features defined as "first", "second", etc., may explicitly or implicitly include one or more of such features, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements, and the specific meaning of the above terms in the present invention can be understood by those skilled in the art through specific situations

Although the present invention has been described in detail with reference to the specific embodiments, the present invention is not limited to the above embodiments, and various changes and modifications without inventive changes may be made within the knowledge of those skilled in the art without departing from the spirit of the present invention.

Claims

1. The utility model provides a device of making an uproar falls for cooling tower axial fan, includes cooling tower wind gap (1), axial fan (2), its characterized in that: the noise reduction device comprises a spring mounting plate (3), a spring (4), a fixing bolt (5), a fastening nut (6), a noise reduction shell (7), a sealing sleeve (8), an upper air outlet (9), an upper guide plate (10), a lower guide plate (11), an upper noise reduction plate (12), a lower noise reduction plate (13) and a lower plate (14); an installation flange is welded on the cooling tower air port (1), and a positioning hole is formed in the flange; the axial flow fan (2) is arranged inside the cooling tower air port (1); a spring (4) is arranged between the spring mounting plates (3), a fixing bolt (5) is welded on the outer side of the spring mounting plates, and the fixing bolt (5) at one end penetrates through a positioning hole on a flange of the cooling tower air port (1); a positioning hole is formed in the bottom surface of the noise reduction shell (7), and a fixing bolt (5) at the other end of the spring mounting plate (3) penetrates through the positioning hole in the noise reduction shell (7); the upper surface of the inner side of the sealing sleeve (8) is arranged on the upper side of the bottom surface of the noise reduction shell (7), penetrates through the fixing bolt (5) and is locked by the fastening nut (6), and the lower surface of the inner side of the sealing sleeve is arranged on the lower surface of a flange of the cooling tower tuyere (1), penetrates through the fixing bolt (5) and is locked by the fastening nut (6); the upper air outlet (9) is arranged at an outlet of the noise reduction shell (7) and is positioned inside the noise reduction shell (7); the upper guide plate (10) is arranged on the lower side of the upper air outlet (9); the upper noise reduction plate (12) is arranged inside the upper guide plate (10); the lower guide plate (11) is arranged on the upper surface of the lower plate (14); the lower noise reduction plate (13) is arranged on the upper surface of the lower plate (14) and is positioned on the inner side of the lower guide plate (11); the lower plate (14) is arranged at the lower outlet of the noise reduction shell (7).

2. The noise reducer for a cooling tower axial flow fan according to claim 1, wherein: six positioning holes are formed in the circumference of the cooling tower air port (1), six positioning holes are formed in the circumference of the bottom surface of the noise reduction shell (7), six positioning holes are formed in the upper side surface and the lower side surface of the sealing sleeve (8), and the cooling tower air port, the noise reduction shell and the sealing sleeve are correspondingly installed according to the positioning holes; the sealing sleeve (8) is a PE corrugated pipe.

3. The noise reducer for a cooling tower axial flow fan according to claim 2, wherein: the spring mounting plate (3), the fixing bolt (5) and the fastening nut (6) are twelve; the number of the springs (4) is six.

4. The noise reducer for a cooling tower axial flow fan according to claim 3, wherein: the noise reduction shell (7) is conical; the upper air outlet (9) is in an inverted cone shape; the outer wall of the air outlet (9) on the inner wall of the noise reduction shell (7) is provided with uneven noise reduction design.

5. The noise reducer for a cooling tower axial flow fan according to claim 4, wherein: the upper guide plate (10), the lower guide plate (11), the upper noise reduction plate (12) and the lower noise reduction plate (13) are all porous plates; the sections of the upper guide plate (10) and the lower guide plate (11) are round, and the sections of the upper noise reduction plate (12) and the lower noise reduction plate (13) are regular hexagons; when the noise reduction device is installed, the upper noise reduction plate (12) is positioned on the inner side of the lower noise reduction plate (13), and the upper guide plate (10) is positioned between the lower guide plate (11) and the lower noise reduction plate (13); the lower plate (14) is provided with a through hole and is positioned outside the lower guide plate (11).