CN223965591U

CN223965591U - Low-frequency air supply noise elimination static pressure box

Info

Publication number: CN223965591U
Application number: CN202520360730.6U
Authority: CN
Inventors: 张玉麟; 李双成; 张旭
Original assignee: Beijing Wanxunda Acoustics Equipment Co ltd
Current assignee: Beijing Wanxunda Acoustics Equipment Co ltd
Priority date: 2025-03-04
Filing date: 2025-03-04
Publication date: 2026-03-03
Anticipated expiration: 2035-03-04

Abstract

This utility model relates to the field of noise reduction technology for air conditioning and ventilation systems, specifically a low-frequency air supply noise reduction static pressure box, including a box body, a noise reduction cavity disposed within the box body, and a noise reduction body disposed between the noise reduction cavity and the inner wall of the box body. An air inlet communicating with the interior of the noise reduction cavity is provided on one side of the box body, and an air outlet communicating with the interior of the noise reduction cavity is provided at the bottom of the box body. A noise reduction structure is disposed within the noise reduction body. In practical applications, airflow enters the noise reduction cavity through the air inlet. Through the combination of the noise reduction cavity, the noise reduction structure, and the noise reduction body, the airflow undergoes composite impedance sound absorption. The noise-reduced airflow is then discharged through the air outlet. This utility model combines a perforated plate and sound-absorbing material with composite impedance sound absorption, resulting in better noise reduction performance.

Description

Low-frequency air supply noise elimination static pressure box

Technical Field

The utility model relates to the technical field of noise elimination of an air conditioning ventilation system, in particular to a low-frequency air supply noise elimination static pressure box.

Background

The silencing static pressure box is a necessary accessory for reducing dynamic pressure, increasing static pressure, stabilizing airflow and reducing airflow vibration of an air supply system, and can enable the air supply effect to be more ideal. A static pressure tank is a device that both allows airflow to pass through and effectively prevents or attenuates the outward propagation of acoustic energy. The existing silencing static pressure box is generally made of an inner shell, an outer shell and sound absorbing materials between the inner shell and the outer shell, silencing effect is achieved through the sound absorbing materials, the structure is simple, the cost is low, the silencing effect is relatively poor, and the silencing effect is to be improved.

Disclosure of utility model

The utility model aims to overcome the defects, and provides the low-frequency air supply silencing static pressure box with better silencing effect, wherein the perforated plate and the sound absorbing material are combined with composite impedance to absorb sound.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

The utility model provides a low frequency air supply noise elimination static pressure case, includes the box, set up in the amortization cavity in the box, set up in amortization body between amortization cavity and the box inner wall, one side of box is provided with the intercommunication the inside air intake of amortization cavity, the bottom of box is provided with the intercommunication the inside air outlet of amortization cavity, be provided with the amortization structure in the amortization body.

Further, the amortization cavity is the rectangle cavity, the rectangle cavity is by front side perforated plate, rear side perforated plate, left side perforated plate, right side perforated plate, upside perforated plate and downside perforated plate welding group become, the rectangle cavity is fixed in the box through many support frames, the air intake passes through right side perforated plate intercommunication rectangle cavity inside, the air outlet passes through downside perforated plate intercommunication rectangle cavity inside.

Further, the amortization structure is including parallel seting up a plurality of recesses on the amortization body, adjacent form the spacer between the recess, be provided with U-shaped perforated plate in the recess, the open end of U-shaped perforated plate is fixed on the left side perforated plate.

Further, the opening end of the U-shaped perforated plate is opposite to the air inlet.

Further, the length direction of the separation sheet is parallel to the air outlet.

Further, the sound deadening body is made of sound absorbing cotton.

The beneficial effects of the utility model are as follows:

in practical application, air flow enters the silencing cavity through the air inlet, composite impedance sound absorption is carried out on the air flow through the silencing cavity, the silencing structure and the silencing body, and the silencing air flow is discharged through the air outlet.

Drawings

FIG. 1 is a top view of the present utility model;

FIG. 2 is a cross-sectional view of the present utility model;

Reference numerals are a case 1, an air inlet 11, an air outlet 12, a muffler 2, a front perforated plate 31, a rear perforated plate 32, a left perforated plate 33, a right perforated plate 34, an upper perforated plate, a lower perforated plate 35, a groove 41, and a partition plate 42, and a U-shaped perforated plate 43.

Detailed Description

As shown in fig. 1 and fig. 2, a low-frequency air supply silencing static pressure box comprises a box body 1, a silencing cavity arranged in the box body 1, a silencing body 2 arranged between the silencing cavity and the inner wall of the box body 1, an air inlet 11 communicated with the inside of the silencing cavity arranged on one side of the box body 1, an air outlet 12 communicated with the inside of the silencing cavity arranged at the bottom of the box body 1, and a silencing structure arranged in the silencing body 2.

When the silencer is used, air flow enters the silencing cavity through the air inlet 11, composite impedance sound absorption is carried out on the air flow through the silencing cavity, the silencing structure and the silencing body, and the silencing air flow is discharged through the air outlet 12.

As shown in fig. 1 and 2, the silencing cavity is a rectangular cavity, the rectangular cavity is formed by welding a front perforated plate 31, a rear perforated plate 32, a left perforated plate 33, a right perforated plate 34, an upper perforated plate and a lower perforated plate 35, the rectangular cavity is fixed in the box 1 through a plurality of supporting frames, the air inlet 11 is communicated with the inside of the rectangular cavity through the right perforated plate 34, and the air outlet 12 is communicated with the inside of the rectangular cavity through the lower perforated plate 35, in this embodiment, noise is reflected in the rectangular cavity through the rectangular cavity formed by welding the front perforated plate 31, the rear perforated plate 32, the left perforated plate 33, the right perforated plate 34, the upper perforated plate and the lower perforated plate 35, and the sound energy is consumed and absorbed, so that the resistance sound absorption of the noise in the airflow is realized.

As shown in fig. 1 and 2, the silencing structure includes a plurality of grooves 41 formed in parallel on the silencing body, a separation sheet 42 is formed between adjacent grooves 41, a U-shaped perforated plate 43 is disposed in each groove 41, an open end of each U-shaped perforated plate 43 is fixed on the left perforated plate 33, in this embodiment, part of sound waves pass through the left perforated plate 33 and enter the grooves 41, and the U-shaped perforated plate 43 and the silencing body 2 are combined to realize composite impedance sound absorption.

In this embodiment, when the open end of the U-shaped perforated plate 43 is disposed opposite to the air inlet 11, noise entering the rectangular cavity is more likely to be refracted into the groove 41.

In this embodiment, when the length direction of the separation sheet 42 is parallel to the air outlet 12, the flow guiding function of the air flow can be achieved to a certain extent, and the condition of weakening the air flow in the silencing process is avoided.

As shown in fig. 1 and 2, the sound deadening body 2 is made of sound absorbing cotton, in this embodiment, after sound waves enter the sound deadening body 2 made of sound absorbing cotton, the sound waves are subjected to resistance of the internal pores of the sound absorbing cotton, and multiple reflection and refraction are generated in the sound absorbing cotton, so that the energy of sound waves is consumed, and noise in the air flow is absorbed.

The specific embodiments described herein are offered by way of example only. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the scope of the utility model as defined.

Claims

1. The low-frequency air supply silencing static pressure box is characterized by comprising a box body, a silencing cavity arranged in the box body, a silencing body arranged between the silencing cavity and the inner wall of the box body, an air inlet communicated with the inside of the silencing cavity, an air outlet communicated with the inside of the silencing cavity and a silencing structure arranged in the silencing body, wherein the air inlet is arranged on one side of the box body.

2. The low-frequency air supply silencing static pressure box according to claim 1, wherein the silencing cavity is a rectangular cavity, the rectangular cavity is formed by welding a front perforated plate, a rear perforated plate, a left perforated plate, a right perforated plate, an upper perforated plate and a lower perforated plate, the rectangular cavity is fixed in the box through a plurality of supporting frames, the air inlet is communicated with the inside of the rectangular cavity through the right perforated plate, and the air outlet is communicated with the inside of the rectangular cavity through the lower perforated plate.

3. The low-frequency air supply silencing static pressure box according to claim 2, wherein the silencing structure comprises a plurality of grooves formed in the silencing body in parallel, separation sheets are formed between the adjacent grooves, a U-shaped perforated plate is arranged in each groove, and the opening end of the U-shaped perforated plate is fixed on the left-side perforated plate.

4. A low frequency air supply muffling static pressure tank as set forth in claim 3, wherein the open end of the U-shaped perforated plate is disposed directly opposite the air inlet.

5. A low frequency air supply muffling static pressure tank as set forth in claim 3, wherein the length direction of said dividing sheet is parallel to said air outlet.

6. The low frequency air supply muffling static pressure box of claim 1, wherein the muffling body is made of sound absorbing cotton.