CN210516212U - Multi-stage throttling and voltage-reducing impedance composite silencer device - Google Patents

Multi-stage throttling and voltage-reducing impedance composite silencer device Download PDF

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CN210516212U
CN210516212U CN201921095044.1U CN201921095044U CN210516212U CN 210516212 U CN210516212 U CN 210516212U CN 201921095044 U CN201921095044 U CN 201921095044U CN 210516212 U CN210516212 U CN 210516212U
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silencer
muffler
noise elimination
sound
absorbing material
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郭媛
王军辉
施俊峰
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Yingde Gas Engineering Zhejiang Co ltd
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Zhejiang Zhihai Chemical Equipment Engineering Co ltd
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Abstract

The utility model provides a compound silencer device of multistage throttle step-down impedance, it mainly includes the silencer body and sets up the hindering nature noise elimination component at the silencer body, silencer body bottom is equipped with an air current import, is equipped with the flange in pairs on this air current import, the flange upper end has welded multistage throttle resistance step-down orifice plate, is equipped with a plurality of align to grid's hindering nature noise elimination component on this multistage throttle resistance step-down orifice plate upper portion, hindering nature noise elimination component carries out fixed connection through shaped steel with the body inner wall, and it has simple structure, safe and reliable, has improved the holistic economic nature of discharge system, has increased gas flow's regulation performance, has reduced the leakage of valve, the consumption of energy saving.

Description

Multi-stage throttling and voltage-reducing impedance composite silencer device
Technical Field
The invention relates to a multi-stage throttling and voltage-reducing impedance composite muffler device, and mainly relates to the field of mufflers.
Background
High-pressure emission noise often appears in petrochemical plants, the emission pressure is very high sometimes, and when high-pressure gas is discharged from a discharge port at a high speed, extremely strong vibration and noise are generated, so that post operating personnel are harmed, and noise pollution is caused to the environment of a plant area or the environment outside the plant. Aiming at the emission noise, a diffusion and resistance composite muffler is usually adopted, so that the volume is large, steel consumption is high, the sound absorption material is lined inside, and the sound absorption effect is reduced due to the fact that the sound absorption material is blown to be damaged, is affected with damp and the like after long-time use.
The multi-stage throttling decompression impedance composite muffler integrates the characteristics of throttling decompression and small hole injection, so that the multi-stage throttling decompression impedance composite muffler can be suitable for exhaust emptying and muffling under various pressure conditions, and has higher muffling amount. The orifice-throttling and pressure-reducing orifice-injection composite exhaust muffler generally adopts a mode of throttling first and then orifice second. The number of layers of the orifice plate is from one to two, and from three to four, the number of layers is determined according to the actual exhaust pressure, and the subsequent orifice injection is generally in the first stage.
The throttling decompression or small hole injection silencer is adopted independently, and the silencing quantity of the silencer cannot meet the use requirement. If these two structures are combined, a greater amount of sound attenuation can be achieved.
Disclosure of Invention
An object of the utility model is to overcome the not enough of prior art existence, and provide a simple structure, safe and reliable, reasonable high-efficient, noise and the vibration's vibration/noise reduction device that can effectual reduction high-pressure gas emission in-process produced.
The utility model discloses a accomplish through following technical scheme: the utility model provides a compound silencer device of multistage throttle step-down impedance, it mainly includes the silencer body and sets up the hindering nature noise elimination component in the silencer body, silencer body bottom is equipped with an air current import, is equipped with the flange in pairs on this air current import, the flange upper end has welded multistage throttle resistance step-down orifice plate, is equipped with a plurality of align to grid's hindering nature noise elimination component on this multistage throttle resistance step-down orifice plate upper portion, hindering nature noise elimination component and body inner wall carry out fixed connection through shaped steel.
2 as preferred: the silencer is characterized in that two trapezoidal supports are arranged on the outer side wall of the silencer body, two lifting lugs used for lifting the silencer body are arranged above the supports, a conical rain cover is further arranged at the top of the silencer body, and two discharge valves are further arranged on two sides of the bottom of the silencer body respectively.
Preferably, the method comprises the following steps: the resistive noise elimination element is composed of a steel frame structure, perforated face protection pore plates are arranged on two sides of the resistive noise elimination element, a sound absorption material is placed in the middle of the resistive noise elimination element, the sound absorption material is prevented from collapsing by being supported by a partition plate in the middle of the sound absorption material, and the sound absorption material is prevented from being blown out by adopting a screen mesh and glass fiber cloth double-channel protection sound absorption material.
The structural parameters of the multistage throttling noise reduction and resistance noise elimination element are determined by calculation according to the thermodynamic parameters of gas; the novel exhaust system is simple in structure, safe and reliable, the overall economy of the exhaust system is improved, the gas flow adjusting performance is improved, the leakage of the valve is reduced, and the energy consumption is saved.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings: as shown in fig. 1, a multi-stage throttling and voltage-reducing impedance composite muffler device mainly comprises a muffler body 9 and a resistive noise elimination element 5 arranged in the muffler body 9, and is characterized in that an air inlet 10 is arranged at the bottom of the muffler body 9, a paired flange 1 is arranged on the air inlet 10, a multi-stage throttling and resistive noise reduction orifice plate 3 is welded at the upper end of the flange 1, a plurality of resistive noise elimination elements 5 which are uniformly arranged are arranged at the upper part of the multi-stage throttling and resistive noise elimination orifice plate 3, the resistive noise elimination element 5 is fixedly connected with the inner wall of the muffler body 9 through section steel, two trapezoidal support seats 4 are arranged on the outer side wall of the muffler body 9, two lifting lugs 6 for lifting the muffler body 9 are arranged above the support seats 4, a conical rain cover 8 is further arranged at the top of the muffler body 9, and two discharge valves 2 are further arranged on two sides of the bottom of the, the resistive noise elimination element 5 is composed of a steel frame structure, perforated face protection pore plates are adopted on two sides, a cavity 12 for placing sound absorption materials is arranged in the middle, the middle of the sound absorption materials is supported by a partition plate 11 to prevent the sound absorption materials from collapsing, and the sound absorption materials are protected by a wire mesh and glass fiber cloth in a double-channel mode to prevent the sound absorption materials from being blown out.
The porous throttling and pressure reducing resistance orifice plate disclosed by the invention can reduce the pressure difference of an inlet and an outlet of high-pressure gas on one hand, on the other hand, after the gas passes through the porous diffuser, the discharged gas flow is filtered into a plurality of small diffused gas flows, the gas flow speed and the pressure drop are gradually reduced, the radiated noise is correspondingly weakened, the aerodynamic noise of the gas flow is controlled, the porous device with reasonable design also has a larger noise reduction effect, and meanwhile, the frequency spectrum of the gas flow passing through the small hole jet noise can move to a high frequency, so that the audible sound component in the frequency spectrum is reduced, and the impact noise of a large jet hole can be eliminated, thereby achieving the effect of reducing the noise.
Example (b): fig. 1 shows a multi-stage throttling and voltage-reducing impedance composite muffler device, which mainly comprises a bottom discharge valve 1, a bottom discharge valve 2, a multi-stage throttling and resistance voltage-reducing orifice plate 3, a support 4, a resistance noise-reducing element 5, a lifting lug 6, a body 7 and a rain cover 8.
The porous noise reduction pipe 1 integrates the respective characteristics of throttling decompression and small hole injection, so that the porous noise reduction pipe can be suitable for exhausting and evaporating steam under various pressure conditions, and the flow area Si of each layer of throttling orifice plate is calculated
Figure BDA0002129247140000021
In the formula: g (t/h) is the required displacement; mu is 1.2, which is the flow coefficient of the porous pipe; i.. m2, 3, 4. K is a coefficient depending on the properties of the exhaust gas medium, and for superheated steam, K is 13.4; for saturated steam K ═ 14.0; k is 13.0 for air (or oxygen, nitrogen, etc.); nu 1 is the specific volume of the gas before throttling, m 3/kg.
In the throttling decompression and small hole injection porous noise reduction tube, the diameter of a small hole is the key for determining the effect of the device, and once the diameter of the small hole is determined, the noise reduction capability of the small hole is correspondingly determined. From the viewpoint of noise reduction, the smaller the diameter of the small hole, the better. However, in the actual process, due to the specific problems of difficult processing of small holes, easy blockage and the like,
the design of the inter-aperture distance has a significant effect. If the distance between the small holes is small, the air flow passes through the small holes to form a plurality of small jets, and then jets with large stroke are converged to radiate mixed jet noise, so that the noise elimination amount is reduced. The spacing between the pores should generally not be less than 5 times the pore diameter. The higher the stagnation pressure before injection, the larger the hole spacing needs to be. If the absolute pressure of the gas before the injection of the small hole of the silencer is P1(kg/cm2) and the injection diameter of the small hole is Dm (mm), when the gas is discharged through the silencer, the interference sound pressure level (namely, A sound level) at 1m in the vertical direction of the injection is as follows:
Figure BDA0002129247140000031
wherein D0 is 1 mm; p0 is ambient atmospheric absolute pressure (kg/cm 2); XA 5fADmc/ac0, fA is the upper frequency of the a sound level, a is the jet velocity, c is the jet sound velocity, c0 is 340m/s is the ambient sound velocity; when blocking, XA is 0.165Dm/D0, M0 is 28.8, which is the molecular weight of air; m is the molecular weight of the jetting gas medium; n is the number of pores.
The noise elimination quantity of the silencer is increased along with the reduction of the diameter of the small hole, and when the aperture is larger than 20mm, the noise elimination quantity is only 2dB (A); if the aperture is halved, the noise elimination amount is increased by 7-9 dB (A); when the aperture is less than 0.8mm, the amount of sound attenuation may be greater than 30dB (A). Although the noise elimination amount can be improved by reducing the aperture, in practical engineering, due to the specific problems of easy blockage of the small hole, difficult processing and the like, the diameter of the small hole is generally not less than 1.5mm, so the corresponding noise elimination amount is limited to about 22dB (A).
Because the silencer resistance at the air inlet can directly influence the power loss of a machine, the inlet silencer is designed to reduce the resistance loss as much as possible, and a sheet-type resistive silencer with good aerodynamic performance and good medium-high frequency silencing effect is generally selected. Greater airflow velocities within the allowable range of blockage are possible. Because the direction of air flow and sound wave propagation has certain benefits for noise attenuation below 1000HZ, the length and the volume of the silencer are reduced.

Claims (3)

1. The utility model provides a compound silencer device of multistage throttle step-down impedance, it mainly includes the silencer body and sets up the hindering nature noise elimination component in the silencer body, its characterized in that silencer body bottom is equipped with an air inlet, is equipped with the flange in pairs on this air inlet, multistage throttle resistance step-down orifice plate has been welded to the flange upper end, is equipped with a plurality of align to grid's hindering nature noise elimination component on this multistage throttle resistance step-down orifice plate upper portion, hindering nature noise elimination component and body inner wall carry out fixed connection through shaped steel.
2. The multi-stage throttling and voltage-reducing impedance compound muffler device as claimed in claim 1, wherein the muffler body is provided with two trapezoidal supports on the outer side wall, two lifting lugs for lifting the muffler body are arranged above the supports, the top of the muffler body is further provided with a conical rain cover, and two exhaust valves are respectively arranged on two sides of the bottom of the muffler body.
3. The multi-stage throttling and voltage-reducing impedance composite muffler device as claimed in claim 1, wherein the resistive muffler element is made of a steel frame structure, perforated facing pore plates are used at two sides, a sound-absorbing material is placed in the middle of the resistive muffler element, the sound-absorbing material is supported by a partition plate in the middle to prevent the sound-absorbing material from collapsing, and a wire mesh and a glass fiber cloth are used for protecting the sound-absorbing material in a double-channel manner to prevent the sound-absorbing material from being blown out.
CN201921095044.1U 2019-07-14 2019-07-14 Multi-stage throttling and voltage-reducing impedance composite silencer device Active CN210516212U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112102805A (en) * 2020-08-28 2020-12-18 武汉理工大学 Adjustable impedance combined type silencer and noise elimination system
CN114283771A (en) * 2021-12-31 2022-04-05 中国航空工业集团公司西安飞机设计研究所 Combined silencer suitable for high-temperature and high-pressure gas emission

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112102805A (en) * 2020-08-28 2020-12-18 武汉理工大学 Adjustable impedance combined type silencer and noise elimination system
CN112102805B (en) * 2020-08-28 2024-05-14 武汉理工大学 Impedance-adjustable composite muffler and noise elimination system
CN114283771A (en) * 2021-12-31 2022-04-05 中国航空工业集团公司西安飞机设计研究所 Combined silencer suitable for high-temperature and high-pressure gas emission

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Address after: No. 280 Xingye Road, Leidian Town, Deqing County, Huzhou City, Zhejiang Province, 313219

Patentee after: Yingde Gas Engineering (Zhejiang) Co.,Ltd.

Address before: 313219 Jingyi Road, Deqing Linhang Industrial Zone, LEIDIAN Town, Deqing County, Huzhou City, Zhejiang Province

Patentee before: ZHEJIANG ZHIHAI CHEMICAL EQUIPMENT ENGINEERING Co.,Ltd.