Baffled air intake for a noise reduced generator set

Abstract

This utility model discloses a deflector-type air intake duct for a noise-reducing generator set, including an intake shell, deflector blades, and a noise-reducing component. The deflector blades are fixedly spaced inside the intake shell and include two interconnected straight sections and a curved section between the two straight sections, used to allow air to flow in a corrugated path. An internal cavity structure with a predetermined width is formed in the width direction of the deflector blades. The noise-reducing component includes a sound-absorbing part disposed in the internal cavity structure of the deflector blades and a perforated structure formed on the deflector blades. This solution can achieve stable support and efficient synchronous cleaning of wafers, improving cleaning uniformity and production efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of generator set noise reduction technology, specifically relating to a deflector air intake duct for a noise-reducing generator set. Background Technology

[0002] Generator sets generate significant airflow and mechanical noise during operation, especially in the air intake duct. High-speed airflow through the intake and collisions with the internal structure easily create vortex and pulsating noise. To meet the requirements of use in environments such as factories, residential areas, and ships, generator sets typically require an intake system with noise reduction capabilities to lower operating noise and improve operational stability and environmental friendliness.

[0003] Existing air intake structures mostly employ straight-through ducts or simple deflector structures, which can reduce noise to some extent, but the noise suppression effect is limited. Furthermore, since traditional deflectors are mostly solid structures, they cannot absorb the energy of internal sound waves, making it difficult to effectively attenuate high-frequency noise within the duct, resulting in insufficient overall noise reduction performance. In addition, due to structural limitations, existing ducts cannot simultaneously achieve airflow guidance and acoustic absorption functions.

[0004] Another type of noise reduction solution involves adding large-area sound-absorbing material inside the air duct or installing a complete silencer. However, such structures are usually large in size, occupy a lot of space, and are complex to install, which is not conducive to the compact layout of the generator set. Furthermore, in a high-speed airflow environment, the sound-absorbing material is easily eroded, affecting its service life. Utility Model Content

[0005] To address the aforementioned problems, this utility model provides a deflector air intake duct for a noise-reducing generator set, comprising an intake shell, deflector blades, and a noise-reducing component. The deflector blades are fixedly spaced inside the intake shell and include two interconnected straight sections and a curved section between the two straight sections, for allowing air to flow in a corrugated path. The deflector blades form an internal cavity structure with a predetermined width in the width direction. The noise-reducing component includes a sound-absorbing part disposed in the internal cavity structure of the deflector blades and a perforated structure formed on the deflector blades.

[0006] Preferably, the perforated structure includes a plurality of ventilation holes formed on the inner and outer walls of the baffle blade, the ventilation holes being staggered from each other in the width direction of the baffle blade.

[0007] Preferably, the sound-absorbing part includes one of glass fiber cotton, sound-absorbing sponge or basalt fiber material filled in the internal cavity structure of the baffle blade, and the sound-absorbing part and the perforated structure form a perforated sound-absorbing composite structure.

[0008] Preferably, the curved portion of the deflector blades adopts an S-shaped structure, causing the incoming air to undergo multiple reversals and diffusions along the waveform channel.

[0009] Preferably, a diffuser plate is provided on the outer side of the deflector blade and extends along the length of the deflector blade. The outer edge of the diffuser plate has an arc-shaped structure so that the airflow forms a smooth diffusion channel when passing through the outer side of the deflector blade.

[0010] The advantages of this utility model are: 1. This solution employs a sandwich cavity structure for the deflector blades, with perforations on the blade surface. This allows sound waves to be weakened not only by the multi-stage S-shaped deflection path during the deflection process but also to pass through the perforations into the cavity, where they are further absorbed by the porous sound-absorbing material inside. Through this combination of geometric deflection attenuation, perforated sound energy leakage, and sound-absorbing material energy dissipation, low-frequency, mid-frequency, and high-frequency noise can be comprehensively suppressed, significantly improving the noise reduction performance of the intake system.

[0011] 2. In this design, a diffuser extending along the length of the deflector blades is installed on the outer side, which allows for secondary guidance of the airflow as it enters the deflector blade area. Because the airflow velocity decreases and the flow direction becomes smoother as it passes through the diffusion area formed by the diffuser, the noise from vortex shedding generated at the outer edge of the blades can be effectively suppressed. Attached Figure Description

[0012] Figure 1 This is a structural diagram of the present utility model.

[0013] Figure 2 This is a structural diagram of the overall assembly of the deflector blades of this utility model.

[0014] Figure 3 This is a structural diagram of a single deflector blade of this utility model.

[0015] Figure 4 This is a top view of a single deflector blade of this utility model. In the diagram: 1. Inlet shell, 2. Deflector blades, 3. Straight section, 4. Curved section, 5. Internal cavity structure, 6. Sound absorption section, 7. Ventilation hole, 8. Flow diffuser. Detailed Implementation

[0016] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0017] In the description of this utility model, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0018] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" 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; it can be a connection within two components. Simultaneously, when an component is referred to as "fixed to" or "equipped on" another component, it can be directly on the other component or may have an intervening component present. When an component is referred to as "connected to" another component, it can be directly connected to the other component or may have an intervening component present. When an component is referred to as "fixedly connected to" another component, it can be a common fixed connection method such as welding, bolting, or gluing. In short, those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0019] Example 1, as Figure 1 As shown, a deflector-type air intake duct for a noise-reducing generator set is installed in the generator set's air intake system. The deflector-type air intake duct mainly includes an intake shell 1, multiple deflector blades 2, and noise-reducing components arranged inside the deflector blades 2. The intake shell 1 is typically made of sheet metal into an integral frame structure, and its dimensions can be adjusted according to the generator's power range. An airflow chamber is formed inside the intake shell 1, and the deflector blades 2 are arranged at fixed intervals inside this chamber, with different blades distributed in parallel to form a multi-stage deflector path. To ensure sufficient strength and corrosion resistance, the intake shell 1 can be made of galvanized steel, stainless steel, or aluminum alloy, and an anti-corrosion layer or a sound-absorbing coating can be applied depending on the humidity and dust levels of the installation environment.

[0020] Combination Figure 4Each deflector blade 2 includes two straight sections 3 and a curved section 4 located between the two straight sections 3. The two straight sections 3 are arranged along the air intake direction, while the curved section 4 adopts an S-shaped structure, so that the air forms a corrugated flow path when passing through the deflector blade 2. Because the deflector blades 2 are continuously arranged in a multi-stage structure, the airflow will undergo multiple changes in direction, speed, and diffusion processes throughout the entire air intake channel, thereby weakening the originally linear noise of a certain intensity and achieving the dual purpose of airflow guidance and noise reduction.

[0021] In conjunction with sections 2-3, the deflector blade 2 forms a cavity structure with a predetermined width within its interior, extending along the blade's length and penetrating the entire blade body. To ensure the cavity can support the sound-absorbing part 6, the deflector blade 2 adopts a sandwich structure, leaving a stable cavity area inside. This structure not only effectively reduces the weight of the blade but also provides the necessary space for installing sound-absorbing materials and perforated structures, forming a perforated sound-absorbing composite structure.

[0022] The noise reduction component comprises two parts: a sound-absorbing part 6 within the internal cavity of the baffle blade 2, and a perforated structure disposed on the baffle blade 2. The perforated structure consists of multiple ventilation holes 7, distributed on the inner and outer walls of the baffle blade 2 and staggered in the width direction to avoid forming a straight sound channel that could lead to sound wave leakage. The opening ratio, aperture, and arrangement of the ventilation holes 7 can be designed according to the characteristics of noise in different frequency bands. Generally, an aperture of 2mm to 6mm is preferred, and in this embodiment, 4mm is preferred. The holes are arranged at intervals, allowing some sound waves to enter the internal cavity of the blade as air flows over its outer surface.

[0023] To enhance sound absorption, the interior of the baffle blade 2 is filled with sound-absorbing material 6, which can be composed of fiberglass wool or sound-absorbing sponge. These materials possess excellent porosity and high sound energy absorption capacity. When sound waves pass through the perforations into the internal cavity, they are repeatedly scattered, rubbed, and attenuated within the porous sound-absorbing material, effectively reducing mid-to-high frequency noise and giving the baffle blade 2 excellent acoustic damping capabilities. The thickness of the sound-absorbing material can be determined according to the overall dimensions of the duct, ensuring both sound absorption and maintaining the overall strength of the blade structure.

[0024] Outside the deflector blade 2, a diffuser plate 8 extending along the blade length is also provided. The diffuser plate 8 protrudes outward from the outside of the blade, and its outer edge forms an arc-shaped structure according to design requirements. The main function of the diffuser plate 8 is to provide secondary guidance for the airflow entering the deflector blade 2 area. As the airflow speed decreases and the flow direction becomes gentler when passing through the diffusion area formed by the diffuser plate 8, it can effectively suppress the vortex shedding noise generated at the outer edge of the blade.

[0025] In practical installation and use, the baffle intake duct of this embodiment is typically arranged on the outer wall of the generator set's intake end or at the opening of the intake pipe. Installation methods can include bolt fixing or welding to ensure structural stability during long-term operation. The overall structural design of the baffle duct balances aerodynamic and acoustic performance; therefore, even under conditions of airflow fluctuations caused by changes in external air density or generator load, the duct's noise reduction capability remains stable.

[0026] When the generator set is running, fresh air from outside enters the intake casing 1 under negative pressure and flows towards the deflector blades 2. The air first passes through the S-shaped path formed by the deflector blades 2, and the airflow velocity gradually decreases during the deflection process, the turbulence intensity weakens, and some sound waves lose energy due to geometric deflection during the flow. Subsequently, the sound waves enter the internal cavity through the blade perforations and are absorbed by the sound-absorbing material, ultimately achieving effective attenuation of broadband noise. The entire process allows air to enter the generator set in a lower noise state, which helps to improve the comfort of equipment operation and environmental friendliness.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A deflector air intake duct for a noise-reducing generator set, characterized in that: The device includes an air intake shell (1), baffle blades (2), and a noise reduction assembly. The baffle blades (2) are fixedly spaced inside the air intake shell (1). The baffle blades (2) include two straight sections (3) connected to each other and a curved section (4) located between the two straight sections (3) for making air flow in a corrugated path. The baffle blades (2) form an internal cavity structure (5) with a predetermined width in the width direction. The noise reduction assembly includes a sound-absorbing part (6) disposed in the internal cavity structure (5) of the baffle blades (2) and a perforated structure opened on the baffle blades (2).

2. The deflector air intake duct of the noise-reducing generator set according to claim 1, characterized in that: The perforated structure includes a plurality of ventilation holes (7) formed on the inner and outer walls of the baffle blade (2), the ventilation holes (7) being staggered from each other in the width direction of the baffle blade (2).

3. The deflector air intake duct of the noise-reducing generator set according to claim 2, characterized in that: The sound-absorbing part (6) includes one of glass fiber cotton, sound-absorbing sponge or basalt fiber material filled in the cavity structure (5) inside the baffle blade (2), and the sound-absorbing part (6) and the perforated structure form a perforated sound-absorbing composite structure.

4. The deflector air intake duct of the noise-reducing generator set according to claim 3, characterized in that: The curved portion (4) of the deflector blade (2) adopts an S-shaped structure, which causes the incoming air to be deflected and diffused multiple times along the waveform channel.

5. The deflector air intake duct of the noise-reducing generator set according to claim 4, characterized in that: The deflector blade (2) has a convex outer side and a diffuser plate (8) extending along the length of the deflector blade (2). The outer edge of the diffuser plate (8) is an arc-shaped structure.

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