CN209928970U - Multi-stage pressure control combined muffler - Google Patents
Multi-stage pressure control combined muffler Download PDFInfo
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- CN209928970U CN209928970U CN201920054778.9U CN201920054778U CN209928970U CN 209928970 U CN209928970 U CN 209928970U CN 201920054778 U CN201920054778 U CN 201920054778U CN 209928970 U CN209928970 U CN 209928970U
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Abstract
The utility model discloses a multistage accuse pressure combined type silencer, main shunt tubes inner chamber lower extreme in the casing sets up the orifice plate, wall portion from last to down has a plurality of circular through-holes to constitute second grade accuse pressure structure, the coaxial setting in outside, fixed connection multilayer accuse pressure section of thick bamboo, it has a plurality of circular through-holes also to spread over from last to down on the section of thick bamboo wall of every layer accuse pressure section of thick bamboo, the crisscross interval distribution of circular through-hole on the section of thick bamboo wall of adjacent two-layer accuse pressure section of thick bamboo, and set up vice shunt tubes, constitute four-level accuse pressure structure, the big pressure drop of atmosphere gas vent discharge is undertaken in a scattered way, make the gas flow that atmosphere gas vent discharge gas is changed into pressure gradual change evacuation from pressure sudden change evacuation, avoid big pressure drop steam discharge to produce strong jet noise, further absorb sound with hindering the sound absorber after the gas jet hole, can the control equipment internal, the muffler is suitable for the use requirements of high pressure and large flow of the nuclear power atmospheric exhaust regulating valve, and has good muffling effect.
Description
Technical Field
The invention relates to a multi-stage pressure control composite muffler in tail end pipeline noise emission control of a main steam relief valve of a third-generation nuclear power system corollary device and other reactor type nuclear power units or an emission pipeline of a similar valve.
Background
Noise pollution is one of four main pollutants in the modern society, and a silencer is a device which allows airflow to pass through but can prevent or weaken sound wave transmission, and is a main technical measure for reducing aerodynamic noise; with the soundness of nuclear power safety regulations in China, the development of nuclear power is going to be developed from 2 nd generation and 2 nd generation semi-technologies to 3 rd generation technologies, and new development opportunities are brought to nuclear power enterprises; the requirements of the nuclear power medium-long term development planning accelerate the autonomous construction of nuclear power equipment manufacturing, strengthen research and development, and make a key breakthrough on the design and manufacturing technology of key equipment; the notice of the national development reform committee office on the work special for organizing and developing the national major technical equipment sets takes the million kilowatt-level nuclear power station complete equipment as the content special for developing the national major technical equipment; for example, the VDA system of Hua Long I nuclear power generating unit has high steam parameters which are higher than those of other nuclear power generating units such as CPR1000, so that the pressure entering the silencer is high and the flow rate is large, and the common silencer cannot adapt to the use requirements of high pressure and large flow rate and cannot effectively solve the high noise pollution of gas emission.
Disclosure of Invention
The invention aims to solve the technical problem of providing a multi-stage pressure control combined muffler which can control the internal pressure drop process of equipment, simultaneously reduce atmospheric emission noise, improve noise spectrum quality, achieve the aim of preventing and controlling noise pollution, adapt to the use requirements of high pressure and large flow of an atmospheric exhaust regulating valve for nuclear power and has good silencing effect.
The invention discloses a multi-stage pressure control composite muffler, which is characterized in that: the device comprises a shell which is hermetically connected through supporting legs and fixedly installed outside an atmospheric exhaust port, wherein a main shunt pipe capable of being connected to an exhaust pipeline is arranged in the middle of an inner cavity of the shell, the top end of the main shunt pipe is closed, the lower end of the main shunt pipe is fixedly connected to the atmospheric exhaust port, and a throttling pore plate is arranged at the lower end of the inner cavity of the main shunt pipe to form a primary pressure control structure; a plurality of circular through holes are distributed on the wall part of the main shunt pipe from top to bottom to form a secondary pressure control structure; the outer part of the middle section of the main shunt pipe is coaxially provided and fixedly connected with a plurality of layers of pressure control cylinders, the height and the diameter of the plurality of layers of pressure control cylinders are sequentially increased from inside to outside, a plurality of circular through holes are distributed on the cylinder wall of each layer of pressure control cylinder from top to bottom, the circular through holes on the cylinder walls of the adjacent two layers of pressure control cylinders are distributed at intervals in a staggered mode to form a labyrinth channel type three-level pressure control structure, the plurality of layers of pressure control cylinders and the inner space of the main shunt pipe form a plurality of pressure control cavities, and the central frequencies of the plurality of pressure control cavities are sequentially increased from inside to outside; a resistance sound absorber is arranged in the position, close to the top, of the inner cavity of the shell, a sound absorbing layer is arranged on the inner surface of the side wall of the shell, which is positioned below the resistance sound absorber, a bird prevention net is arranged on the part, which is positioned above the resistance sound absorber, and a rain cover is arranged on the top of the shell;
the four layers of pressure control cylinders are coaxially arranged and fixedly connected outside the middle section of the main shunt pipe, wherein the top and the bottom of the three layers of pressure control cylinders positioned on the inner side are spherical surfaces, and the top and the bottom of the pressure control cylinder positioned on the outermost side are planes;
the four layers of pressure control cylinders and the inner space of the main shunt pipe form five pressure control cavities, and the central frequencies of the five pressure control cavities are sequentially increased from inside to outside and are 980Hz, 2000Hz, 3820Hz, 4350Hz and 5230Hz respectively;
the bottom of the shell is a spherical surface, and the thickness of the sound absorption layer on the inner surface of the bottom of the shell is larger than that of the sound absorption layer on the inner surface of the side wall;
an auxiliary shunt pipe is arranged in the inner cavity of the shell at the position outside the main shunt pipe, the top end of the auxiliary shunt pipe is closed, the bottom end of the auxiliary shunt pipe is fixedly connected to an atmospheric exhaust port, and a plurality of circular through holes are distributed on the wall part of the auxiliary shunt pipe from top to bottom to form a four-stage pressure control structure;
a plurality of auxiliary shunt pipes are arranged in the inner cavity of the shell, and are uniformly distributed along the circumferential direction and arranged around the main shunt pipe;
the outer part of the lower end of the main shunt pipe is connected with a drain port through a sealing device, and a liquid collecting disc is arranged below the drain port;
a lifting lug is fixedly connected to the position, corresponding to the resistive sound absorber, outside the shell;
the sound absorption layer and the resistive sound absorber are made of glass wool;
the diameter of the circular through hole in the wall parts of the main shunt pipe and the multilayer pressure control cylinder is 6-20 mm.
The invention relates to a multi-stage pressure control composite muffler, wherein the lower end of the inner cavity of a main shunt pipe is provided with a throttle orifice plate to form a first-stage pressure control structure, the wall part of the main shunt pipe is provided with a plurality of circular through holes from top to bottom to form a second-stage pressure control structure, the outer part of the middle section of the main shunt pipe is coaxially and fixedly connected with a plurality of pressure control cylinders, the wall of each pressure control cylinder is also provided with a plurality of circular through holes from top to bottom, the circular through holes on the walls of the adjacent two pressure control cylinders are staggered and distributed at intervals to form a labyrinth channel type three-stage pressure control structure, the inner cavity of a shell is provided with an auxiliary shunt pipe at the outer side of the main shunt pipe, the top end of the auxiliary shunt pipe is sealed, the bottom end of the auxiliary shunt pipe is fixedly connected to an atmospheric exhaust port, the wall part of the auxiliary shunt pipe is also provided with a plurality of circular, the air flow discharged from the air exhaust port is changed from pressure abrupt evacuation to pressure gradual evacuation, so that strong jet noise generated by large-pressure-drop steam discharge is avoided, the gas is injected from the small hole and then is supplemented with the resistive sound absorber for further sound absorption, the internal pressure drop process of the equipment can be controlled, the air exhaust noise is reduced, the noise spectrum quality is improved, the noise pollution prevention and control target is achieved, the use requirements of high pressure and large flow of the air exhaust regulating valve for nuclear power are met, and the noise elimination effect is good; the method can be popularized to the pollution control of high-temperature high-pressure high-flow and all-pressure steam fluid emission noise of other generator sets, and the cost performance of the method has comparative advantages under the extreme parameter environment; the method can reduce noise, improve environmental quality and has wide applicability while maintaining energy conservation and environmental protection of nuclear power projects.
Drawings
FIG. 1 is a schematic plan view of a multi-stage pressure control composite muffler according to an embodiment of the present invention;
in the figure:
1. the device comprises supporting legs, 2 parts of a liquid collecting disc, 3 parts of a drain port, 4 parts of a sealing device, 5 parts of a primary pressure control-throttling orifice plate, 6 parts of a secondary pressure control-main flow dividing pipe, 7 parts of a tertiary pressure control-multilayer pressure control cylinder, 8 parts of a four-level pressure control-auxiliary flow dividing pipe, 9 parts of a sound absorbing layer, 10 parts of a shell, 11 parts of a resistive sound absorber, 12 parts of lifting lugs, 13 parts of a bird preventing net, 14 parts of a rain cover.
Detailed Description
As shown in the figure, the multi-stage pressure control combined muffler comprises a shell 10 which is hermetically connected and fixedly installed outside an atmospheric exhaust port through supporting legs 1, wherein a main shunt pipe 6 which can be connected to an exhaust pipeline is arranged in the middle of the inner cavity of the shell 10, the top end of the main shunt pipe 6 is closed, the lower end of the main shunt pipe is fixedly connected to the atmospheric exhaust port, and a throttle orifice plate 5 is arranged at the lower end of the inner cavity of the main shunt pipe 6 to form a one-stage pressure control structure; a plurality of circular through holes are distributed on the wall part of the main shunt pipe 6 from top to bottom to form a secondary pressure control structure; the external coaxial setting of the middle section of the main shunt tube 6, fixedly connected with the multilayer pressure control barrel 7, the height, the diameter of the multilayer pressure control barrel 7 increase in order from inside to outside in proper order, the cylinder wall of each layer of pressure control barrel is distributed with a plurality of round through holes from top to bottom, the round through holes on the cylinder wall of the adjacent two layers of pressure control barrel are distributed in the staggered interval, make the air current circulate from top to bottom, left to right along the round through holes, form the labyrinth passage type three-stage pressure control structure, disperse and bear the large pressure drop discharged from the atmospheric vent through the multi-stage pressure control structure, the pressure drop born by each stage of pressure control structure is reduced gradually, make the air current discharged from the atmospheric vent change from the pressure abrupt change evacuation into the pressure gradual change evacuation, avoid the strong jet noise generated by the large pressure drop evacuation, can control the internal pressure drop process of the equipment, reduce the atmospheric emission, the high-pressure high-flow exhaust regulating valve meets the use requirements of high pressure and high flow of the nuclear power atmospheric exhaust regulating valve.
The multilayer pressure control cylinder 7 and the inner space of the main shunt pipe 6 form a plurality of pressure control cavities, the center frequencies of the pressure control cavities are sequentially increased from inside to outside, namely the frequencies in the cavities in the silencer are sequentially increased from air inlet to air outlet.
The position of the inner cavity of the shell, which is close to the top, is provided with a resistive sound absorber 11, the part of the inner surface of the side wall of the shell, which is positioned below the resistive sound absorber, is provided with a sound absorbing layer 9, and after gas is jetted from the small hole, the resistive sound absorber 11 and the sound absorbing layer 9 are used for further sound absorption, so that the sound absorption effect is improved.
The part that casing 10 lateral wall internal surface is located hindering nature acoustic absorber 11 top is provided with prevents bird net 13, prevents that the toy from getting into the silencer in, and casing 10 top is provided with rain-proof cover 14, prevents that dust, rainwater from gathering, and barrier propterty is high.
The outside coaxial setting in 6 middle sections of main shunt tubes, four layers of accuse pressure cylinder 7 of fixed connection, wherein lie in the inboard three-layer accuse pressure cylinder top, bottom all be the sphere, and the outermost accuse is pressed a top, bottom and is all the plane, and the further buffering air current flowing pressure in spherical bottom, top, the pressure that the section of thick bamboo bore is pressed to the outermost accuse is less, and considers space limitation, helps the outermost accuse to press a top, bottom to set up to the less plane of occupation space.
The four layers of pressure control cylinders 7 and the inner space of the main shunt pipe 6 form five pressure control cavities, the central frequencies of the five pressure control cavities are sequentially increased from inside to outside and are 980Hz, 2000Hz, 3820Hz, 4350Hz and 5230Hz respectively;
the outer part of the middle section of the main shunt pipe 6 can be coaxially arranged and fixedly connected with pressure control cylinders 7 with different numbers according to different configurations designed by a nuclear power unit and an atmospheric valve discharge system, the number of cavities can be increased or decreased according to parameter requirements, and frequencies such as 250Hz, 500Hz, 1000Hz, 2000Hz, 4000Hz, 8000Hz and the like are distributed in a core frequency spectrum region needing to be controlled.
The bottom of the shell 10 is a spherical surface, and the thickness of the sound absorption layer on the inner surface of the bottom of the shell is larger than that of the sound absorption layer on the inner surface of the side wall, so that the sound absorption effect is improved.
The position that the casing 10 inner chamber is located the main shunt tubes outside is provided with vice shunt tubes 8, and every vice shunt tubes 8 top is sealed, and the bottom is direct and main steam safety valve fixed connection, and vice shunt tubes wall portion is from last to also having spread over a plurality of circular through-holes down, constitutes level four accuse pressure structure, further improves atmosphere gas vent exhaust pressure drop dispersion effect.
The shell inner chamber can set up many vice shunt tubes according to the different configurations of nuclear power unit and atmosphere valve discharge system design, and many vice shunt tubes along circumferencial direction evenly distributed, encircle main shunt tubes and set up, and vice shunt tubes quantity can increase and decrease as required, generally speaking, and the parameter is higher, then cavity quantity can increase, otherwise then reduces.
The outer part of the lower end of the main shunt pipe 6 is connected with a drain port 3 through a sealing device 4, and a liquid collecting disc 2 is arranged below the drain port 3; so as to collect moisture discharged from the atmospheric vent.
A lifting lug 12 is fixedly connected to the position, corresponding to the resistive sound absorber, outside the shell 10, so that the lifting, the transportation and the installation are facilitated.
The sound absorption layer and the resistive sound absorber are made of glass wool, and the sound absorption effect is good.
The diameter of the circular through hole in the wall parts of the main shunt tube 6 and the multilayer pressure control cylinder 7 is 6-20mm, the gas circulation is smooth, and the pressure reduction effect is good.
The specific design concept is as follows:
the invention relates to a multi-stage pressure control composite muffler, wherein the lower end of the inner cavity of a main shunt pipe is provided with a throttle orifice plate to form a first-stage pressure control structure, the wall part of the main shunt pipe is provided with a plurality of circular through holes from top to bottom to form a second-stage pressure control structure, the outer part of the middle section of the main shunt pipe is coaxially and fixedly connected with a plurality of pressure control cylinders, the wall of each pressure control cylinder is also provided with a plurality of circular through holes from top to bottom, the circular through holes on the walls of the adjacent two pressure control cylinders are staggered and distributed at intervals to form a labyrinth channel type three-stage pressure control structure, the inner cavity of a shell is provided with an auxiliary shunt pipe at the outer side of the main shunt pipe, the top end of the auxiliary shunt pipe is sealed, the bottom end of the auxiliary shunt pipe is fixedly connected to an atmospheric exhaust port, the wall part of the auxiliary shunt pipe is also provided with a plurality of circular, the air flow discharged from the air exhaust port is changed from pressure abrupt evacuation to pressure gradual evacuation, so that strong jet noise generated by large-pressure-drop steam discharge is avoided, the gas is injected from the small hole and then is supplemented with the resistive sound absorber for further sound absorption, the internal pressure drop process of the equipment can be controlled, the air exhaust noise is reduced, the noise spectrum quality is improved, the noise pollution prevention and control target is achieved, the use requirements of high pressure and large flow of the air exhaust regulating valve for nuclear power are met, and the noise elimination effect is good; the method can be popularized to the pollution control of high-temperature high-pressure high-flow and all-pressure steam fluid emission noise of other generator sets, and the cost performance of the method has comparative advantages under the extreme parameter environment; the method can reduce noise, improve environmental quality and has wide applicability while maintaining energy conservation and environmental protection of nuclear power projects.
The silencer structure belongs to an atmospheric exhaust release regulating valve silencer structure for nuclear power, can be used for third-generation nuclear power system corollary equipment, can also be used for tail end pipeline noise emission control of an emission pipeline of a main steam relief valve or a similar valve of other reactor type nuclear power units, and is a multi-stage pressure control composite silencer structure.
Noise pollution as one of the four major pollutants of today, a silencer is a device which allows airflow to pass through but can prevent or weaken sound wave propagation, and is one of the main technical measures for reducing aerodynamic noise.
With the soundness of nuclear power safety regulations in China, the development of nuclear power is going to be developed from 2 nd generation of technology to 3 rd generation of technology, and new development opportunities are brought to nuclear power enterprises. The requirements of the nuclear power medium and long term development planning accelerate the autonomous construction of nuclear power equipment manufacturing, strengthen research and development, and make a key breakthrough on the design and manufacturing technology of key equipment. Notification of the national development reform Commission office on the work special for developing the national major technical equipment by organizations takes the million kilowatt-level nuclear power station complete equipment as the content special for developing the national major technical equipment.
The VDA system of the Hualongyi nuclear power unit has high steam parameters, higher than parameters of other nuclear power units such as CPR1000 and the like, high pressure and large flow when entering a silencer, and how to control the pressure of the silencer and solve high noise pollution of gas emission.
The multi-stage pressure control composite muffler structure has the advantages that a total large pressure drop is dispersed to a plurality of local structures for bearing by utilizing the pressure reduction of the orifice plate device, so that the pressure drop on each local structure is reduced, namely, the pressure is suddenly changed into pressure gradual change evacuation, the strong jet noise generated by large pressure drop exhaust steam is avoided, and the gas is injected from the small orifice and then is supplemented with a resistive sound absorber for further sound absorption, so that a better sound elimination effect is achieved.
The invention aims to provide a silencer structure, which solves a technical problem in the prior art.
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides silencing equipment for an atmospheric exhaust port, and aims to effectively control the pressure drop process in the equipment, reduce atmospheric emission noise, improve noise spectrum quality and achieve the aim of preventing and controlling noise pollution.
In an exemplary embodiment of the present invention, the sound absorbing body may be glass wool, and the sub shunt pipe may be selected as appropriate.
In order to achieve the purpose, the invention adopts the technical scheme that:
a multi-stage pressure control composite muffler for nuclear power comprises a multi-stage pressure control structure, a supporting structure, a drainage device, an auxiliary sound absorption device and a protection device. The core structure of the silencer is a multi-stage pressure control device which is directly connected with an atmospheric exhaust port and used for reducing noise.
A plurality of cavities are arranged in the multi-stage pressure control device, and each cavity is internally provided with a plurality of flow equalizing holes with different apertures. The center frequencies of the cavities are sequentially arranged from low frequency to high frequency from the air inlet end to the air outlet end of the silencer.
The number of the cavities is five, each cavity comprises a plurality of flow equalizing holes with the diameter of 6-20mm, and the center frequencies of the five cavities are 980Hz, 2000Hz, 3820Hz, 4350Hz and 5230Hz respectively. According to different configurations of nuclear power units and atmospheric valve discharge system designs, the cavity can be increased or decreased freely. In general, the number of cavities may be increased for higher parameters, and decreased for the opposite.
The invention has the beneficial effects that: 1. the multi-stage pressure control composite muffler is a main silencing element in an atmospheric exhaust system, and is widely applied to design of an atmospheric exhaust regulating valve for nuclear power. 2. The structure integrates the multi-stage pressure control device, effectively solves the pressure relief noise of the exhaust valve, and the shunt pipe in the multi-stage pressure control device is communicated with the exhaust port. 3. The silencer with the structure can be popularized to other generator set high-temperature high-pressure high-flow and full-pressure steam fluid emission noise pollution treatment, and the cost performance of the silencer has the advantages under the extreme parameter environment. 4. The invention can reduce noise, improve environmental quality and has wide applicability while maintaining energy conservation and environmental protection of nuclear power projects.
The invention relates to a silencer for nuclear power, which comprises a silencer multi-stage pressure control structure, a supporting structure, a drainage device, a sound absorption device and a protection device. The multi-stage pressure control structure comprises an internal multi-stage pressure control noise elimination structure and a multi-pipeline discharge pressure control noise elimination structure, and small hole array structures are adopted; the pore opening mode of the small hole has a noise frequency spectrum frequency shift effect, and the multi-stage pressure reduction structure has the effect of regulating and controlling pressure release step by step. The sound absorption device has the function of improving the noise spectrum characteristic, and the drainage device and the protection device play a role in guaranteeing the operation safety and the environmental safety of equipment. The whole equipment can efficiently solve the problems of pressure relief and noise reduction of the steam exhaust port, has good strength and corrosion resistance, and meets the standard and standard requirements of nuclear power high safety. The invention solves the problem of noise reduction of the exhaust port, has stable and durable system and low manpower maintenance cost, meets the requirements of national energy-saving and environment-friendly development, and is suitable for the exhaust noise treatment of the atmospheric exhaust regulating valve or similar valve (group) of various nuclear power units
The silencer core structure is a multi-stage pressure control device 5-8 which is directly connected with an atmospheric exhaust port and used for reducing noise, the multi-stage pressure control device is divided into four stages, and comprises a first-stage throttling orifice plate 5, a second-stage main shunt pipe 6, a third-stage multi-layer pressure control barrel 7 and a fourth-stage auxiliary shunt pipe 8, wherein a plurality of cavities 6-8 are arranged in two to four stages of pressure control, and each cavity is internally provided with a plurality of uniform flow holes with different apertures.
The second-level main shunt pipe 6 is directly connected with an atmospheric exhaust port, and the first-level orifice plate.
The first-stage throttling orifice plate 5 is arranged in the second-stage main shunt pipe 6 and is arranged between the main shunt pipe and the atmosphere exhaust port.
The three-level multi-layer pressure-controlling cylinder is divided into three layers in this example, and is disposed outside the two-level main shunt pipe 6.
The four-stage-auxiliary shunt pipe is directly connected with the main steam safety valve.
The multistage control pressure device is uniformly distributed on the periphery of the secondary-main shunt pipe 6 in a circumferential manner, and is symmetrical in pairs; the aperture of the flow equalizing hole of the four-level-auxiliary shunt pipe is set according to the discharge parameters of the medium and the fluid of the safety valve, and the central frequency of the flow equalizing hole is distributed in the region of 4000-.
The central frequencies of the cavities are sequentially changed from low frequency to high frequency from the direction from the air inlet to the air outlet of the multistage pressure control device 5-8.
The number of the cavities is five, each cavity comprises a plurality of flow equalizing holes with the diameter of 6-20mm, and the center frequencies of the five cavities are 980Hz, 2000Hz, 3200Hz, 4350Hz and 5230Hz respectively.
The cavity structure can be increased or decreased to meet the discharge requirements of characteristic media and fluid parameters, the center frequency of the cavity structure can be adjusted and controlled, and the cavity structure is distributed in a core frequency spectrum region needing to be controlled (such as 250Hz, 500Hz, 1000Hz, 2000Hz, 4000Hz and 8000 Hz).
The supporting leg 1 as a supporting structure is fixed on a civil foundation, and the support adopts a combined structure form of an array large-opening pipe diameter leg seat and a skirt seat or a single structure thereof.
The drain device includes a drain opening 3 and a drip pan 2. The drainage device meets the effective discharge of water condensed by the steam-discharging fluid medium in the extremely low temperature environment in winter, and meets the drainage experiment working condition on the basis.
The auxiliary sound absorption means comprise a sound absorption layer 9 attached to a housing 10 and a resistive sound absorber 11 and its supporting structure.
The arrangement of the shell and the internal sound absorption device influences the flow velocity distribution of fluid of the silencer and the generation frequency spectrum distribution of regenerative noise, a layer of resistive sound absorber 11 is arranged in the shell 10 in a concentric ring or parallel flat plate type, and can be of a single-layer or multi-layer structure, and the multi-layer structure can be in a staggered ring (column) or crossed arrangement mode.
The noise frequency spectrum of the auxiliary sound absorption device determines the sound absorption quantity of the structure according to 63Hz, 125Hz, 250Hz, 500Hz, 1000Hz, 2000Hz, 4000Hz and 8000Hz, and the effective upper and lower limit frequencies of the auxiliary sound absorption device are determined according to the core frequency spectrum area which is distributed according to the parameter requirements of the nuclear power unit and the atmospheric valve discharge system, so that the acoustic characteristic of the silencer meets the equipment specification requirement.
The protection device comprises a rain cover 14 and a bird prevention net 13, the rain cover and the bird prevention net are combined and screwed or welded on the shell 10, and the rain cover adopts a wedge-shaped flow guide structure and is constructed together with the auxiliary noise elimination layer (the sound absorption layer and the protection panel)).
Claims (10)
1. The utility model provides a combined type silencer is pressed in multistage accuse which characterized in that: the pressure control device comprises a shell which is hermetically connected through supporting legs and fixedly installed outside an atmospheric exhaust port, wherein a main shunt pipe capable of being connected to an exhaust pipeline is arranged in the middle of an inner cavity of the shell, the top end of the main shunt pipe is closed, the lower end of the main shunt pipe is fixedly connected to the atmospheric exhaust port, and a throttling pore plate is arranged at the lower end of the inner cavity of the main shunt pipe to form a primary pressure control structure; a plurality of circular through holes are distributed on the wall part of the main shunt pipe from top to bottom to form a secondary pressure control structure; the outer part of the middle section of the main shunt pipe is coaxially provided and fixedly connected with a plurality of layers of pressure control cylinders, the height and the diameter of the plurality of layers of pressure control cylinders are sequentially increased from inside to outside, a plurality of circular through holes are distributed on the cylinder wall of each layer of pressure control cylinder from top to bottom, the circular through holes on the cylinder walls of the adjacent two layers of pressure control cylinders are distributed at intervals in a staggered mode to form a labyrinth channel type three-level pressure control structure, the plurality of layers of pressure control cylinders and the inner space of the main shunt pipe form a plurality of pressure control cavities, and the central frequencies of the plurality of pressure control cavities are sequentially increased from inside to outside; the position that the casing inner chamber is close to the top is provided with hindering nature sound absorber, and the part that casing lateral wall internal surface is located hindering nature sound absorber below is provided with the sound absorbing layer, and the part that is located hindering nature sound absorber top is provided with prevents the bird net, and the casing top is provided with rain-proof cover.
2. The multi-stage pressure control composite muffler of claim 1, wherein: the outer part of the middle section of the main shunt pipe is coaxially provided with four layers of pressure control cylinders which are fixedly connected, wherein the top and the bottom of the three layers of pressure control cylinders positioned on the inner side are spherical surfaces, and the top and the bottom of the pressure control cylinder positioned on the outermost side are planes.
3. The multi-stage pressure control composite muffler of claim 2, wherein: the four layers of pressure control cylinders and the inner space of the main shunt pipe form five pressure control cavities, and the central frequencies of the five pressure control cavities are sequentially increased from inside to outside and are 980Hz, 2000Hz, 3820Hz, 4350Hz and 5230Hz respectively.
4. The multi-stage pressure control composite muffler of claim 1, wherein: the bottom of the shell is a spherical surface, and the thickness of the sound absorption layer on the inner surface of the bottom of the shell is larger than that of the sound absorption layer on the inner surface of the side wall.
5. The multi-stage pressure control composite muffler of claim 1, wherein: the shell is characterized in that an auxiliary shunt pipe is arranged at the position, located on the outer side of the main shunt pipe, of the inner cavity of the shell, the top end of the auxiliary shunt pipe is sealed, the bottom end of the auxiliary shunt pipe is fixedly connected to an atmospheric exhaust port, and a plurality of circular through holes are distributed in the wall portion of the auxiliary shunt pipe from top to bottom to form a four-stage pressure control structure.
6. The multi-stage pressure control composite muffler of claim 5, wherein: the inner cavity of the shell is provided with a plurality of auxiliary shunt tubes which are uniformly distributed along the circumferential direction and arranged around the main shunt tube.
7. The multi-stage pressure control composite muffler of claim 1, wherein: the outer part of the lower end of the main shunt pipe is connected with a drain port through a sealing device, and a liquid collecting disc is arranged below the drain port.
8. The multi-stage pressure control composite muffler of claim 1, wherein: the position outside the shell corresponding to the resistive sound absorber is fixedly connected with a lifting lug.
9. The multi-stage pressure control composite muffler of claim 1, wherein: the sound absorption layer and the resistive sound absorber are made of glass wool.
10. The multi-stage pressure control composite muffler of claim 1, wherein: the diameter of the circular through hole in the wall parts of the main shunt pipe and the multilayer pressure control cylinder is 6-20 mm.
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| CN201920054778.9U CN209928970U (en) | 2019-01-14 | 2019-01-14 | Multi-stage pressure control combined muffler |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109767747A (en) * | 2019-01-14 | 2019-05-17 | 镇江华东电力设备制造厂有限公司 | A kind of multistage pressure control complex muffler |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109767747A (en) * | 2019-01-14 | 2019-05-17 | 镇江华东电力设备制造厂有限公司 | A kind of multistage pressure control complex muffler |
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