A separate chamber noise reduction blower

Abstract

The utility model discloses a kind of separate cavity noise reduction blower, including shell, impeller being arranged in shell and be used to drive the rotating drive mechanism of the rotation of the impeller, the shell is provided with air inlet and outlet section flow channel, wherein, the outlet section flow channel is equipped with isolator, the isolator extends along the extension direction of the outlet section flow channel, for this outlet section flow channel is separated into two branch flow channels with equal cross-sectional area and same shape, wherein, the inner wall of at least one branch flow channel is equipped with composite lining;The outlet end of two branch flow channels is merged to form total output flow channel.The separate cavity noise reduction blower of the utility model can be realized at high speed, reduce noise.

Description

Technical Field

[0001] This utility model belongs to the field of surface cleaning technology for cameras and LiDAR, and specifically relates to a noise reduction blower with a separation chamber. Background Technology

[0002] In the field of gas cleaning, blowers, as core power equipment, need to provide a continuous and stable airflow for the cleaning process to ensure the efficiency of key aspects such as contaminant removal and media circulation. Due to the requirements of the cleaning scenario, these blowers typically need to meet the dual requirements of high static pressure and large flow rate—high static pressure can overcome the pipeline resistance of the cleaning system and ensure the airflow pressure at the far end, while large flow rate can increase the gas exchange volume per unit time and shorten the cleaning cycle.

[0003] To achieve the aforementioned performance requirements, traditional technical solutions often increase the impeller speed of the blower: increased speed directly increases the airflow linear velocity, thereby simultaneously enhancing static pressure and flow output. However, high-speed operation can cause significant noise problems, with the core noise source concentrated in the mating area between the impeller and the baffle. When the impeller rotates at high speed, the blades periodically sweep across the fixed baffle, causing periodic pressure pulsations in the airflow between them, forming discrete frequency rotational noise. At the same time, the high-speed airflow is prone to severe impact and turbulent separation at the edge of the baffle, further amplifying aerodynamic noise. This type of noise not only deteriorates the operating environment and fails to meet industrial noise emission standards, but may also be transmitted to the equipment body along with high-frequency vibrations, affecting the service life of blower bearings, seals, and other components, and increasing maintenance costs.

[0004] Therefore, how to effectively suppress the noise in the impeller tongue area while ensuring the high static pressure and large flow performance of the blower has become a key issue that needs to be addressed in the design and optimization of blowers for gas cleaning. Summary of the Invention

[0005] In order to overcome the shortcomings of the existing technology, this utility model provides a noise-reducing blower with a separation chamber, which can reduce noise while maintaining high speed.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is: A noise-reducing blower with a separation chamber includes a casing, an impeller disposed within the casing, and a rotary drive mechanism for driving the impeller to rotate. The casing contains an air inlet and an outlet flow channel. The outlet flow channel contains an isolating element extending along its extension direction to divide it into two branch flow channels with equal cross-sectional areas and identical shapes. At least one branch flow channel has a composite lining on its inner wall. The outlet ends of the two branch flow channels merge to form a main output flow channel.

[0007] Preferably, the isolation element is an isolation rib disposed inside the housing.

[0008] Preferably, both branch channels are provided with composite linings.

[0009] Preferably, the composite lining consists of a honeycomb structure layer and a porous sound-absorbing material layer.

[0010] Preferably, the housing includes an upper fan frame and a lower fan frame, wherein a sound-absorbing layer is provided on the inner wall of the upper fan frame.

[0011] Preferably, the sound-absorbing layer is a glass fiber lining made of sound-absorbing material.

[0012] Preferably, the housing has a spiral volute structure.

[0013] Preferably, the rotary drive mechanism includes a motor, which is mounted on the housing, and the main shaft of the motor is connected to the impeller.

[0014] Compared with the prior art, this utility model has the following advantages and beneficial effects: The present invention's separation chamber noise reduction blower precisely divides the outlet section flow channel cavity into two branch flow channels with equal cross-sectional areas and identical shapes through an isolator. When compressed air flows through this point, it will be evenly distributed to the two flow channels, ensuring that the pressure pulsations carried by the two airflows are consistent in terms of frequency, amplitude, and other characteristics, creating the preconditions for interference cancellation. The pipe wall of one of the branch flow channels is equipped with a composite lining. Through the resonance damping effect of the honeycomb cavity and the obstruction effect of the porous material, the composite lining can significantly reduce the propagation phase velocity of sound waves in this flow channel (and the phase velocity decreases synchronously with the frequency), making it a "low-frequency sound wave delay line". By designing the parameters of the composite lining, the propagation time difference between the sound wave in one path and the sound wave in another straight flow channel can be precisely controlled, making it exactly equal to half the cycle of the low-frequency pressure pulsation. Finally, when the two airflows converge at the end of the flow channel, the pressure pulsations they carry are completely opposite in phase (one peak corresponds to another trough), resulting in violent and destructive interference. The pressure pulsations cancel each other out, thereby achieving efficient suppression of low-frequency noise and achieving an effect that almost eliminates pulsation noise. Attached Figure Description

[0015] Figure 1 This is a three-dimensional schematic diagram of the noise reduction blower with a separation chamber according to this utility model.

[0016] In the diagram: 1-Isolation rib; 2-Upper sector frame; 3-Lower sector frame. Detailed Implementation

[0017] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the implementation of the present invention is not limited thereto.

[0018] See Figure 1 The present invention relates to a noise-reducing blower with a separation chamber, comprising a casing, an impeller disposed within the casing, and a rotary drive mechanism for driving the impeller to rotate. The casing has a spiral volute structure, including an upper fan frame and a lower fan frame. The inner side of the upper fan frame is provided with a sound-absorbing layer, which is a glass fiber lining made of sound-absorbing material. The casing contains an air inlet and an outlet channel. The outlet channel has an isolator extending along its direction, dividing it into two branch channels with equal cross-sectional areas and identical shapes. At least one branch channel has a composite lining on its inner wall, consisting of a honeycomb structure layer and a porous sound-absorbing material layer. The outlet ends of the two branch channels merge to form a main output channel. The rotary drive mechanism includes a motor, which is mounted on the housing, and the main shaft of the motor is connected to the impeller.

[0019] In this embodiment, the isolation element is an isolation rib installed inside the housing.

[0020] See Figure 1 The working principle of this utility model is as follows: First, a fiberglass lining is installed on the inner wall of the upper part of the fan frame. Its porous structure is used to initially attenuate the low-frequency sound vibrations caused by the pressure pulsation of airflow in the pipe. When the low-frequency sound waves act on the fiberglass lining, some of the sound energy will drive air molecules into the tiny pores of the fiberglass lining. Through the friction and adhesion between the molecules and the fibers, it is converted into heat energy and consumed, thereby reducing the initial energy of the noise.

[0021] Simultaneously, isolating ribs are installed within the outlet section flow channel to precisely divide the flow channel cavity into two branch flow channels with equal cross-sectional areas and identical shapes. When compressed air flows through this section, it is evenly distributed into the two flow channels, ensuring that the pressure pulsations carried by the two airflows maintain consistency in frequency, amplitude, and other characteristics, creating the preconditions for interference cancellation. The pipe wall of one of the branch flow channels is fitted with a composite lining composed of a honeycomb structure layer and a porous material layer. This composite lining, through the resonant damping effect of the honeycomb cavity and the obstructive effect of the porous material, can significantly reduce the propagation phase velocity of sound waves within this outlet section flow channel (and the phase velocity decreases synchronously with the frequency), making it a "low-frequency sound wave delay line." By designing the parameters of the composite lining, the propagation time difference between this sound wave and the sound wave in the other branch flow channel can be precisely controlled, making it exactly equal to half the period of the low-frequency pressure pulsation.

[0022] Ultimately, when the two airflows converge at the end of the outlet channel, the pressure pulsations they carry are completely opposite in phase (one peak corresponds to another trough), causing violent and destructive interference. The pressure pulsations cancel each other out, thus achieving efficient suppression of low-frequency noise and almost eliminating pulsation noise.

[0023] The above are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above content. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present utility model shall be considered equivalent substitutions and shall be included within the protection scope of the present utility model.

Claims

1. A noise-reducing blower with a separation chamber, comprising a casing, an impeller disposed within the casing, and a rotary drive mechanism for driving the impeller to rotate, characterized in that, The housing is provided with an air inlet and an outlet flow channel. The outlet flow channel is provided with an isolation component that extends along the extension direction of the outlet flow channel to divide the outlet flow channel into two branch flow channels with equal cross-sectional areas and the same shape. At least one branch flow channel has a composite lining on its inner wall. The outlet ends of the two branch flow channels merge to form a total output flow channel.

2. The noise-reducing blower with a separation chamber according to claim 1, characterized in that, The isolation component is an isolation rib installed inside the casing.

3. The noise-reducing blower with a separation chamber according to claim 2, characterized in that, Both branch channels are lined with composite linings.

4. The noise-reducing blower with a separation chamber according to claim 3, characterized in that, The composite lining consists of a honeycomb structure layer and a porous sound-absorbing material layer.

5. The noise-reducing blower with a separation chamber according to claim 1, characterized in that, The housing includes an upper fan frame and a lower fan frame, wherein a sound-absorbing layer is provided on the inner wall of the upper fan frame.

6. The noise-reducing blower with a separation chamber according to claim 5, characterized in that, The sound-absorbing layer is a glass fiber lining made of sound-absorbing material.

7. The noise-reducing blower with a separation chamber according to claim 1, characterized in that, The casing has a spiral volute structure.

8. The noise-reducing blower with a separation chamber according to claim 1, characterized in that, The rotary drive mechanism includes a motor, which is mounted on the housing, and the main shaft of the motor is connected to the impeller.

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