Noise reduction device for cooling tower fan
By designing a noise reduction device with dynamically adjustable resonant cavity volume on the cooling tower fan, combined with sound-absorbing plates and oblique through-hole structures, the problems of poor low-frequency noise reduction and low airflow efficiency of existing devices are solved, achieving adaptive noise reduction and efficient airflow.
Patent Information
- Application Number
- CN202520462714.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-17
- Publication Date
- 2026-02-13
- Estimated Expiration
- 2035-03-17
AI Technical Summary
Existing cooling tower fan noise reduction devices have limited effectiveness in reducing low-frequency noise, and their large size affects airflow efficiency, especially at low wind speeds.
Design a noise reduction device including a housing, noise reduction components and sound-absorbing panels. Utilize a resonant cavity and oblique through-hole structure, adjust the volume of the resonant cavity by airflow speed, combine with the sound-absorbing panels to absorb noise, dynamically adjust the noise reduction effect, and reduce the collision between airflow and the inner wall.
It achieves adaptive noise reduction performance, improves the low-frequency noise reduction effect, and at the same time ensures airflow efficiency and reduces the impact of the device on the operation of the fan.
Smart Images
Figure CN223908503U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to noise reduction equipment technical field, concretely is a kind of cooling tower fan is with noise reduction device. BACKGROUND
[0002] The existing cooling tower fan noise reduction device is mostly resistive noise reduction device, which realizes the purpose of sound elimination by setting resistive material on the inner wall of air duct. However, the resistive material has limited effect on low-frequency noise elimination, and low-frequency noise is the main component of fan noise, thus limiting the overall effect of the noise reduction device.
[0003] In actual use, in order to achieve the intended noise reduction effect, it is often necessary to increase the length of the noise reduction device, thereby increasing the length of the resonance cavity and improving the noise reduction effect, which results in a relatively large size and weight of the noise reduction device. When the fan speed is low, such length of noise reduction device will affect the efficiency of airflow circulation, thereby affecting the normal operation of the fan. In view of this, a cooling tower fan noise reduction device is proposed. SUMMARY
[0004] The main purpose of the utility model is to provide a cooling tower fan noise reduction device, which can solve the problems raised in the background art.
[0005] To achieve the above purpose, the cooling tower fan noise reduction device proposed by the utility model comprises a shell, a noise reduction assembly arranged inside the shell, sound-absorbing panels arranged on the shell and the noise reduction assembly, and a resonance cavity formed between the shell and the noise reduction assembly.
[0006] A sleeve rod is fixedly connected to the surface of the shell, and a round rod is sleeved on the sleeve rod. The inner wall of the round rod and the sleeve rod is elastically connected by a connecting spring.
[0007] A sliding member is fixed to the top of the round rod and is slidingly connected in the shell.
[0008] An inclined through hole is formed on the outer wall of the sliding member. During the process of airflow passing through the shell, the airflow moves from bottom to top. The gas enters the resonance cavity through the honeycomb holes of the shell and presses the sliding member, so that the round rod stretches the connecting spring. When the size of the gas flow rate is stable, the volume of the resonance cavity is stable, the sound generated by the airflow is reduced, and the volume of the resonance cavity is affected by the size of the gas flow rate. At the same time, when the gas flows out of the inclined through hole, the collision between the airflow passing through the shell and the inner wall of the sliding member can be reduced, and further noise reduction processing is performed.
[0009] Preferably, the shell is fixedly installed at the air outlet of the cooling tower fan by bolts.
[0010] Preferably, the top of the sliding piece is fixedly connected with an inwardly retracting ring, and the bottom of the sliding piece is designed to be inclined, so that further noise reduction is achieved and the gas flow rate is increased through the use of the inwardly retracting ring.
[0011] Preferably, the side of the shell close to the sliding piece and the side of the sliding piece away from the shell are both fixedly installed with sound-absorbing plates.
[0012] Preferably, the volume of the resonant cavity changes when the sliding piece slides on the inner surface of the shell.
[0013] Preferably, the lower side of the shell is provided with a honeycomb hole, and the top of the shell is fixedly connected with a limiting ring.
[0014] The utility model provides a cooling tower fan uses noise reduction device. Have the following beneficial effects:
[0015] (1), this cooling tower fan uses noise reduction device through the use of noise reduction assembly, in the process that gas passes through the shell, can dynamically adjust the volume of resonant cavity, when the gas flow rate increases, the sliding piece is pushed by gas, and the connecting spring is stretched, and the volume of resonant cavity is increased, so that the noise generated by the gas flow is effectively absorbed and weakened, and this dynamic adjustment mechanism makes the noise reduction effect self -adaptation along with the change of gas flow rate, provides more remarkable noise reduction performance, guarantees the efficiency of gas flow.
[0016] (2), this cooling tower fan uses noise reduction device through the design of inclined through -hole, and the gas flow from the inclined through -hole can reduce the collision of the gas flow through the shell and the inner wall of the sliding piece, and then reduces the direct impact with the inner wall of the sliding piece, further reduces the generation of noise, simultaneously, the sound-absorbing plate is fixedly installed on both sides of the shell, can absorb and reflect noise, enhances the noise reduction effect. BRIEF DESCRIPTION OF DRAWINGS
[0017] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to the structure shown in these drawings without creating creative labor.
[0018] Figure 1 It is the whole three-dimensional structure schematic diagram of the utility model;
[0019] Figure 2 It is the whole sectional structure schematic diagram of the utility model;
[0020] Figure 3 It is the part three-dimensional structure schematic diagram of the utility model Figure 1 ;
[0021] Figure 4 For part of the three-dimensional structure of the utility model Figure 2 .
[0022] Brief description of drawings:
[0023] 1, the shell; 2, noise reduction assembly; 3, sound absorption board; 4, resonance cavity; 101, honeycomb hole; 102, limit ring; 21, sleeve rod; 22, round rod; 23, connecting spring; 24, sliding piece; 25, inclined through hole; 241, inner shrink ring.
[0024] The utility model discloses the realization, functional characteristics and advantages will be further described with reference to the drawings in conjunction with the embodiment. Specific embodiments
[0025] The technical scheme in the embodiments of the utility model will be described clearly and completely in conjunction with the drawings of the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.
[0026] Please refer to Figures 1-4 The utility model provides a kind of noise reduction device for cooling tower fan, including shell 1, shell 1 is fixedly installed by bolt at the air outlet of cooling tower fan, the inside of shell 1 is provided with noise reduction assembly 2, the lower side of shell 1 is equipped with honeycomb hole 101, the top of shell 1 is fixedly connected with limit ring 102, shell 1 and noise reduction assembly 2 are all provided with sound absorption board 3, by the use of sound absorption board 3, noise can be absorbed and reflected, enhance the effect of noise reduction, shell 1 and noise reduction assembly 2 form resonance cavity 4 between.
[0027] In the embodiment of the utility model, in order to be able to adjust the size of the resonant cavity 4 according to the outlet airflow velocity of the cooling tower fan, facilitate the airflow circulation and also can reduce the influence on the fan work, specifically, the noise reduction assembly 2 includes sleeve rod 21, sliding piece 24 and inclined through hole 25, sleeve rod 21 is fixedly connected on the surface of the shell 1, sleeve rod 21 is sleeved with round rod 22, the inner wall of round rod 22 and sleeve rod 21 is elastically connected through connecting spring 23, sliding piece 24 is fixed with the top of round rod 22, sliding piece 24 is slidingly connected in the shell 1, inclined through hole 25 is set up on the outer wall of sliding piece 24, when sliding piece 24 slides on the inner surface of the shell 1, the volume of resonant cavity 4 changes, the airflow enters resonant cavity 4 through the honeycomb hole 101 of the shell 1 and extrudes sliding piece 24, makes round rod 22 stretch connecting spring 23, the volume of resonant cavity 4 increases, when the gas flow rate is stable, the volume of resonant cavity 4 is stable, realizes the noise reduction treatment to the sound produced by the airflow, the volume of resonant cavity 4 is influenced by the gas flow rate;
[0028] Wherein, the resonant cavity 4 resonance frequency formula is: When the volume of resonant cavity 4 increases, the resonant frequency fr will be smaller, thereby effectively absorbing and weakening the noise produced by the airflow, and this dynamic adjustment mechanism makes the noise reduction effect self-adapting with the change of gas flow rate, provides more significant noise reduction performance, guarantees the efficiency of airflow circulation.
[0029] Further, through the design of inclined through hole 25, when the gas flows out from inclined through hole 25, the collision of the airflow passing through the shell 1 and the inner wall of sliding piece 24 can be reduced, thereby reducing the direct impact with the inner wall of sliding piece 24, further reducing the generation of noise.
[0030] Further, in order to further improve the noise reduction effect, specifically, the top of sliding piece 24 is fixedly connected with inner shrink ring 241, the bottom of sliding piece 24 is designed to be inclined, the side of shell 1 close to sliding piece 24 and the side of sliding piece 24 away from shell 1 are both fixedly installed with sound-absorbing panel 3, through the use of inner shrink ring 241, further noise reduction treatment is realized, and the gas flow rate is also accelerated.
[0031] In the utility model, when using, first the device is fixedly installed at the outlet of the cooling tower fan through bolt, when the airflow enters resonant cavity 4 through the honeycomb hole 101 of the shell 1 and extrudes sliding piece 24, makes round rod 22 stretch connecting spring 23, the volume of resonant cavity 4 increases, when the gas flow rate is stable, the volume of resonant cavity 4 is stable, when the volume of resonant cavity 4 increases, the resonant frequency fr will be smaller, thereby effectively absorbing and weakening the noise produced by the airflow, simultaneously, through the design of inclined through hole 25, when the gas flows out from inclined through hole 25, the collision of the airflow passing through the shell 1 and the inner wall of sliding piece 24 can be reduced, thereby reducing the direct impact with the inner wall of sliding piece 24, reducing the noise.
[0032] The above merely describes preferred embodiments of the present application, and does not limit the patent scope of the present application, and any equivalent structural transformation made by using the content of the present application specification and drawings, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.
Claims
1. A noise reduction device for cooling tower fan, comprising a shell (1), characterized in that: The inside of the shell (1) is provided with a noise reduction assembly (2), the shell (1) and the noise reduction assembly (2) are provided with sound absorption panels (3), a resonance cavity (4) is formed between the shell (1) and the noise reduction assembly (2), and the noise reduction assembly (2) comprises: A sleeve rod (21) is fixedly connected to the surface of the shell (1), a round rod (22) is sleeved on the sleeve rod (21), and the inner wall of the sleeve rod (21) is elastically connected with the round rod (22) through a connecting spring (23); A sliding piece (24) is fixed to the top of the round rod (22) and is slidingly connected in the shell (1); An inclined through hole (25) is formed in the outer wall of the sliding piece (24).
2. The noise reduction device for cooling tower fan according to claim 1, characterized in that: The shell (1) is fixedly installed at the air outlet of the cooling tower fan by bolts.
3. The noise reduction device for cooling tower fan according to claim 2, characterized in that: The top of the sliding piece (24) is fixedly connected with an inwardly retracting ring (241), and the bottom of the sliding piece (24) is designed to be inclined.
4. The noise reduction device for cooling tower fan according to claim 1, characterized in that: The side of the shell (1) close to the sliding piece (24) and the side of the sliding piece (24) away from the shell (1) are both fixedly installed with sound absorption panels (3).
5. The noise reduction device for cooling tower fan according to claim 1, characterized in that: When the sliding piece (24) slides on the inner surface of the shell (1), the volume of the resonance cavity (4) changes.
6. The noise reduction device for cooling tower fan according to claim 5, characterized in that: The lower side of the shell (1) is provided with a honeycomb hole (101), and the top of the shell (1) is fixedly connected with a limiting ring (102).