Ejector rear pressure equalizing and rectifying static pressure box type silencer
Through the design of a rear-emitter equalization rectifier static pressure box muffler, combined with the equalization and rectifier static pressure muffler, the noise pollution problem of high-pressure and high-speed airflow is solved, and good noise muffler effect and equipment stability are achieved.
Patent Information
- Application Number
- CN202422120403.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-29
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-08-29
AI Technical Summary
When traditional static pressure mufflers deal with high-pressure and high-speed airflow, the noise reduction effect is poor, and the pulsating airflow is not sufficiently smooth, resulting in large regenerative noise, affecting the noise reduction effect of the muffler.
A rear-inductor uniform rectified static pressure box muffler is designed, including a uniform pressure silence section, a resistive sound silence section and a rectified static pressure muffler. Through the combination of the equal pressure silence section and a rectified static pressure muffler, the dynamic and static pressure conversion is achieved by using the expanded space and flow field changes, and combining the resistive sound silence sheet and sound absorbing material to achieve the effects of resistance reduction, equalization and sound silence.
It effectively reduces the noise radiation and pulsation of airflow during pipeline transmission, and the noise silence can reach 15~60dB(A), extending the service life of the muffler and ensuring the safety and stability of the muffler.
Smart Images
Figure CN223051868U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of metallurgical industry, and particularly relates to an equalizing and rectifying static pressure box type muffler behind an ejector. Background Art
[0002] The post-ejector of the gas recovery in the top charging hopper is generally located in the blast furnace gas purification area. The post-ejector injects the purified high-pressure gas or other gases to be recovered into the low-pressure pipeline through a pipeline. During the gas drainage process, since the pipeline medium is high-pressure and high-speed gas, high noise is generated during the injection process, and the noise radiates to the surrounding environment along the pipeline. The noise value of the ejector and the pipeline can reach up to 118 - 120 dB(A) at most.
[0003] The traditional static pressure muffler combines a resistive muffler and a static pressure box. The resistive section uses porous sound-absorbing materials (resistive materials) to absorb sound energy and reduce noise; the static pressure section uses the structural form to interfere with the sound wave propagation, thereby achieving the sound absorption effect. However, since the gas to be treated is high-speed and high-pressure gas, the single static pressure rectification effect is not good, the pulsating air flow is not fully smoothed, and the regeneration noise is large, which further affects the noise reduction effect of the muffler. Summary of the Utility Model
[0004] The purpose of the utility model is to solve the deficiencies existing in the above background art, and provide an equalizing and rectifying static pressure box type muffler behind an ejector, which is used to deal with the high-intensity jet noise pollution with wide frequency spectrum, high sound level, long propagation distance and wide range generated during the pipeline transmission of the purified high-pressure, high-temperature and high-speed gas flow.
[0005] The technical scheme adopted by the utility model is: an equalizing and rectifying static pressure box type muffler behind an ejector, which includes a muffler housing arranged on the pipeline behind the ejector. Both ends of the muffler housing are respectively connected to the air flow pipelines. The muffler housing and the air flow pipelines are communicated through a reducing pipe. Inside the muffler housing, an equalizing and sound-absorbing section, a resistive sound-absorbing section and a rectifying static pressure sound-absorbing section are successively arranged from front to back along the air flow direction. A plurality of sound-absorbing sheets are arranged inside the resistive sound-absorbing section.
[0006] In the above technical scheme, the equalizing and sound-absorbing section utilizes factors such as the enlarged space and the change of the flow field in the space to cause the conversion of dynamic and static pressure, so as to achieve the effects of resistance reduction, pressure equalization and sound absorption. The air flow at a certain speed enters the rectifying static pressure sound-absorbing section after passing through the resistive muffler. The rectifying static pressure sound-absorbing section has basically the same function as the equalizing and sound-absorbing section, and both play a role in equalizing and adjusting the air flow.
[0007] A further preferred structure is that the plurality of sound-absorbing sheets are arranged horizontally, vertically or obliquely at intervals.
[0008] A further preferred structure is that the sound-absorbing sheets are filled with centrifugal glass wool as the sound-absorbing layer.
[0009] A further preferred structure is that a flow guiding tip is provided at one end of the silencing sheet close to the pressure equalizing silencing section, which is convenient for air flow to enter the resistive silencing section.
[0010] A further preferred structure is that both ends of the reducer pipe are respectively butted with the interface of the air flow pipeline and the air inlet of the muffler housing by high-pressure flanges.
[0011] A further preferred structure is that both the pressure equalizing silencing section and the rectifying static pressure silencing section are formed into a closed space by composite sound absorption and insulation boards, and the joints between the boards of the composite sound absorption and insulation boards are welded with flanges to ensure the sealing of the box body.
[0012] A further preferred structure is that the length L4 of the rectifying static pressure silencing section is 1.5 to 15 times the length L2 of the pressure equalizing silencing section.
[0013] A further preferred structure is that the length L3 of the resistive silencing section is 0.5 m to 10 m.
[0014] A further preferred structure is that the air inlet cross-section of the muffler is 1.5 to 10 times the cross-sectional area of the pipeline behind the ejector.
[0015] A further preferred structure is that the interface of the air flow pipeline is circular and the air inlet of the muffler housing is square.
[0016] In the above technical solution, since the interface of the air flow pipeline and the air inlet of the muffler housing are inconsistent in shape or size, a reducer pipe needs to be used for connection and transition between the two. The lengths and sizes of the front and rear reducer pipes will be adjusted according to the sizes of the butted air flow pipeline interface and the air inlet of the muffler housing.
[0017] The beneficial effects of the present utility model are as follows:
[0018] The present utility model is a pressure equalizing and rectifying box-type muffler specifically designed for treating the noise pollution of the high-speed, high-temperature, and high-pressure purified gas flow after the ejector of the gas recovery ejector at the top of the blast furnace.
[0019] The present utility model equalizes the high-pressure and high-speed air flow velocity and pressure through the pressure equalizing silencing section, the resistive silencing section, and the rectifying static pressure silencing section, reduces the noise radiation and air flow pulsation during the pipeline transmission of the air flow, achieves a good silencing effect, prolongs the service life of the muffler, and ensures the safety and stability during the use of the muffler. The silencing amount of the pressure equalizing, rectifying, and static pressure box-type muffler after the ejector of the present utility model can reach 15 to 60 dB(A).
[0020] All structural components inside the present utility model are connected by welding. The structure has firm and reliable indirect joints and good integrity, which not only meets the requirements of easy installation, but also has a firm structure and good process sealing performance. Description of the Drawings
[0021] Figure 1 is a schematic cross-sectional view of the present utility model;
[0022] Figure 2 is a schematic external view of the present utility model;
[0023] Figure 3 is Figure 1 axial sectional view at A-A in
[0024] Figure 4 is Figure 1 axial sectional view at B-B in
[0025] Figure 5 is Figure 1 axial sectional view at C-C in
[0026] Figure 6 is Figure 1 axial sectional view at D-D in
[0027] Figure 7 is Figure 1 axial sectional view at E-E in
[0028] Figure 8 is Figure 1 axial sectional view at F-F in
[0029] Figure 9 is Figure 1 axial sectional view at G-G in
[0030] Among them, 1 - air flow pipeline; 2 - high-pressure flange; 3 - reducer pipe; 4 - pressure equalizing and sound-absorbing section; 5 - resistive sound-absorbing section (5-1 - sound-absorbing sheet, 5-2 - flow guiding tip); 6 - rectifying static pressure sound-absorbing section; 7 - muffler housing; 8 - composite sound absorption and insulation board. Specific embodiments
[0031] The present utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, which is convenient for clearly understanding the present utility model, but they do not constitute a limitation to the present utility model.
[0032] As Figures 1 to 8 shown, the present utility model includes a muffler housing 7 arranged on the pipeline behind the ejector. The two ends of the muffler housing 7 are respectively connected to the air flow pipeline 1. The muffler housing 7 is communicated with the air flow pipeline 1 through a reducer pipe 3. Inside the muffler housing 7, a pressure equalizing and sound-absorbing section 4, a resistive sound-absorbing section 5, and a rectifying static pressure sound-absorbing section 6 are sequentially arranged from front to back along the air flow direction. A plurality of sound-absorbing sheets 5-1 are arranged inside the resistive sound-absorbing section 5.
[0033] The pressure equalizing and noise elimination section 4 utilizes factors such as the expanded space and the change of the flow field in the space to cause the conversion of dynamic and static pressure, achieving the effects of resistance reduction, pressure equalization, and noise elimination. The air flow at a certain speed enters the rectifying static pressure and noise elimination section after passing through the resistive muffler 5. The rectifying static pressure and noise elimination section 6 has basically the same function as the pressure equalizing and noise elimination section 4, both playing a role in pressure equalizing adjustment of the air flow.
[0034] In some optional embodiments, such as Figures 3 to 5 shown, multiple muffler plates 5-1 are arranged horizontally, vertically, or obliquely at intervals. The distance d between the muffler plates 5-1 and the thickness e of the plates are reasonably controlled according to requirements to balance the relationship between resistance loss and noise reduction amount; the distance d between the muffler plates 5-1 and the thickness e of the plates need to be determined according to factors such as air flow rate, air flow speed, cross-sectional ratio, noise reduction amount, and combined with the spectral characteristics of the pipeline air flow noise.
[0035] Such as Figures 1 to 2 shown, the height h of the muffler housing 7 and the width b of the muffler housing 7 need to be determined according to factors such as pipeline air volume, wind speed, resistance loss, and combined with the installation position of the muffler.
[0036] In some optional embodiments, the muffler plates 5-1 are filled with high-performance sound-absorbing materials that are resistant to high temperature, high humidity, acid and alkali, not easy to shed powder, and not easy to accumulate dust, such as using centrifugal glass wool as the sound-absorbing layer.
[0037] In some optional embodiments, such as Figure 1 shown, a flow guiding tip 5-2 is provided at one end of the muffler plate 5-1 close to the pressure equalizing and noise elimination section 4 to facilitate the air flow to enter the resistive noise elimination section.
[0038] In some optional embodiments, such as Figure 1 shown, both ends of the reducer pipe 3 are respectively butted with the interface of the air flow pipeline 1 and the air inlet of the muffler housing 7 by high-pressure flanges 2.
[0039] In some optional embodiments, such as Figure 1 , Figure 5 shown, both the pressure equalizing and noise elimination section 4 and the rectifying static pressure and noise elimination section 6 are formed into a closed space by using composite sound-absorbing and sound-insulating plates 8 with a thickness c of 50 mm to 250 mm. The joints between the plates of the composite sound-absorbing and sound-insulating plates 8 are welded with flanges. Ensure the sealing of the box body.
[0040] In some optional embodiments, such as Figure 1 shown, the length L4 of the rectifying static pressure and noise elimination section 6 is 1.5 to 15 times the length L2 of the pressure equalizing and noise elimination section 4.
[0041] In some optional embodiments, such as Figure 1 shown, the length L3 of the resistive noise elimination section 5 is 0.5 m to 10 m.
[0042] In some alternative embodiments, the air inlet cross-section of the muffler is 1.5 to 10 times the cross-sectional area of the duct behind the ejector.
[0043] In some alternative embodiments, as Figure 1 shown, the interface of the air flow duct 1 is circular or square or other cross-sectional shapes, and the air inlet of the muffler housing 7 is square or circular or other cross-sectional shapes. Since the interface of the air flow duct 1 and the air inlet of the muffler housing 7 are inconsistent in shape or size, a reducer pipe 3 needs to be used to connect and transition between them. The lengths L1 and L5 and the dimensions of the front and rear reducer pipes 3 will be adjusted according to the sizes of the interface of the air flow duct 1 and the air inlet of the muffler housing 7 for docking.
[0044] The equalizing, rectifying and static pressure box type muffler of the ejector in the present utility model combines noise elimination and secondary rectifying static pressure. After the air flow violently disturbed by the ejector enters the equalizing, rectifying and static pressure box type muffler, it first undergoes equalizing, rectifying and noise elimination, and then enters the static pressure box section for further noise elimination, pressure expansion and flow stabilization, so that the air flow becomes gentle again. After better reducing the generation of regenerated noise and eliminating the air flow pulsation and the noise overflowing from the ejector, the air flow flows smoothly into the subsequent duct, thereby eliminating noise.
[0045] The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.
Claims
1. A static pressure box type muffler with equalizing pressure and rectification after ejector, characterized in that: The invention comprises a muffler shell (7) arranged on the rear pipe of the ejector, the two ends of the muffler shell (7) are respectively connected to the airflow pipe (1), the muffler shell (7) and the airflow pipe (1) are communicated with each other via a reducer (3), and a pressure equalizing muffler section (4), a resistive muffler section (5) and a rectifying static pressure muffler section (6) are sequentially arranged in the muffler shell (7) along the airflow direction from front to back, and the resistive muffler section (5) has a plurality of muffler sheets (5-1) built therein.
2. The ejector post-pressure equalizing rectifier static pressure box type muffler according to claim 1, characterized in that: The plurality of sound-absorbing sheets (5-1) are arranged at intervals in a horizontal, vertical or oblique manner.
3. The ejector post-pressure equalizing rectifier static pressure box type muffler according to claim 1 or 2, characterized in that: The sound-absorbing sheet (5-1) is filled with centrifugal glass sound-absorbing cotton as a sound-absorbing layer.
4. The ejector post-pressure equalizing and rectifying static pressure box type muffler according to claim 1 or 2, characterized in that: A flow guide tip (5-2) is provided at one end of the silencer sheet (5-1) close to the pressure equalizing silencer section (4).
5. The ejector post-pressure equalizing rectifier static pressure box type muffler according to claim 1, characterized in that: The two ends of the reducer (3) are respectively connected to the interface of the airflow duct (1) and the air inlet of the muffler housing (7) using high-pressure flanges (2).
6. The ejector post-pressure equalizing rectifier static pressure box type muffler according to claim 1, characterized in that: The pressure-equalizing silencer section (4) and the rectifying static-pressure silencer section (6) both use a composite sound-absorbing and sound-isolating board (8) to form a closed space, and the board-to-board connections of the composite sound-absorbing and sound-isolating board (8) are welded by folding.
7. The ejector post-pressure equalizing rectifier static pressure box type muffler according to claim 1, characterized in that: The length L4 of the rectifying static pressure silencer section (6) is 1.5 to 15 times the length L2 of the equalizing pressure silencer section (4).
8. The ejector post-pressure equalizing rectifier static pressure box type muffler according to claim 1, characterized in that: The length L3 of the resistive sound-absorbing section (5) is 0.5 m to 10 m.
9. The ejector post-pressure equalizing rectifier static pressure box type muffler according to claim 1, characterized in that: The air inlet section of the muffler is 1.5 to 10 times the cross-sectional area of the pipeline behind the ejector.
10. The ejector post-pressure equalizing rectifier static pressure box type muffler according to claim 1, characterized in that: The interface of the airflow duct (1) is circular, and the air inlet of the muffler housing (7) is square.